Today's article mainly teaches you how to choose a transmission shaft specific balancing machine that is suitable for your own use. The price of transmission shaft balancing machines varies greatly, and high priced products generally have a stylish appearance and excellent performance, making them suitable for use by transmission shaft manufacturers. In mid to low price products, the situation is quite complex, but it is by no means the higher the price, the better the quality. Sometimes, you may buy a balance machine that is difficult to use at a higher price. In order not to regret spending money on it, you should seek advice from people who have used different types of balance machines and consult their usage experience. Compare more before making a decision.
When you want to purchase a transmission shaft dynamic balancing machine, you may feel confused about the various balancing machines and numerous prices on the market. Even if you have been operating a balancing machine for many years, you may not have a clear distinction between its good and bad qualities. If you only listen to the manufacturer's introduction, you may spend a high price to buy a balance machine that is not very suitable for yourself.
1、 The influencing components of precision unevenness:
Due to the use of microcomputer technology by all manufacturers, the technology has become very mature, and the errors generated by the electronic measurement part are almost negligible. The relationship between the accuracy of the transmission shaft dynamic balancing machine and the electronic part is already very small. The two most important influencing components are the connection between the transmission shaft and the balancing machine. The second is to balance the machining accuracy of the spindle of the balancing machine.
2、 Factors affecting weight loss rate
If the weight reduction rate of the balancing machine is relatively high, it can be balanced with fewer rotations. The factors affecting the weight reduction rate are:
1. Is the calibration of the balancing machine accurate.
2. Is the weight and position of the placed balance block accurate.
3. The gap size between the cross shaft of the transmission shaft and the telescopic sliding key.
3、 Low speed and high speed
The balancing machine with soft support must reach a speed of at least three times the resonance speed in order to detect (the higher the speed, the higher the weight reduction rate), so some individual machines use higher speeds. Hard supported balancing machines must operate at a speed below three times the resonance speed, so some use lower speeds (especially for heavy-duty drive shafts). The unevenness of the rotational speed is also related to the flexibility of the sensor used. If a sensor with high flexibility is used, a lower rotational speed can be used. In the maintenance industry, if a lower speed is used, drivers often consider the outcome of balance, so there is a trend towards forward speed. When balancing heavy transmission shafts, the speed of the hard supported balancing machine is occasionally low, and drivers easily doubt the outcome of balancing, which has led to the popularity of soft supported balancing machines. When choosing a balancing machine, don't just ask how high the mechanical speed can reach, but also clarify the speed that can be achieved when balancing large transmission shafts such as Steyr.
4、 Digital display and wattmeter display
The performance of a balancing machine is basically unrelated to display design, but digital display is not only intuitive, but also has the highest reliability, is not easily damaged, and can provide some useful additional functions. Therefore, digital display is the mainstream standard policy. The wattmeter display system will gradually exit the market. It is also beneficial for balancing computer monitors. Its only advantage is that it appears more stylish and suitable for large users, but its complexity is much higher and reliability will significantly decrease (the more complex the tool, the more likely it is to malfunction). Small users should avoid using it.
5、 Distinguishing between different connection arrangements
The adjacent arrangement referred to here refers to the connection arrangement between the rear end (with a bridge bearing) of the front drive shaft (or middle drive shaft) and the balancing machine. This issue is crucial to the performance of the balancing machine, and neglecting it is a big taboo when choosing a balancing machine. At present, there are several types of connection systems available:
The first type is double roller support, which is generally used for hard supported balancing machines, and this type of preparation has better accuracy. The disadvantage is that it cannot monitor the status of the bridge bearing during operation, cannot reflect the eccentricity of the protruding fork (see later introduction), and is not easy to detect the jumping amount of the protruding element.
The second method is to directly use bridge bearing hangers for support, which is most suitable for practical working conditions and balances the site the best. And it can conveniently detect the runout of the protruding element, as well as monitor the torsion and noise of the bridge bearing. Sometimes it can also prevent the disassembly and assembly of bridge bearings, making the work the most effortless.
The third method is to directly connect the middle protruding element, which is bolted directly to the right swing frame. This is the most commonly used solution. For this type of balancing machine, if you do a few more tests yourself, you will understand how serious its problems are. You install the front drive shaft onto the balancing machine and use a dial gauge to check the runout of the (bridge bearing) journal. The magnitude of this runout determines the true balance effect. The amount of runout here is equivalent to the amount of runout of the spindle of the balancing machine. When performing dynamic balancing, the core of the middle protruding element stop is the rotating core. After being installed on the car, the rotating core becomes the axis of the bridge bearing (point A). The axis of balance is not consistent with the axis of actual work, which will inevitably cause errors. A large amount of maintenance data confirms that errors caused by such axis transformations are generally between 30 and 100 grams. When operating this type of balancing machine, you will also find a strange phenomenon that if the sliding key of the middle protruding element is tightly matched, the balancing result will be very poor, or even impossible to balance at all. Due to the fact that this type of balancing machine must rely on the clearance of the middle protruding element sliding key to solve the problem of walking stiffness, without clearance, the sliding key will be stiff and naturally unable to work.
In order to achieve the desired effect when balancing the front drive shaft, special attention should be paid when choosing a contiguous configuration. In order to be suitable for both the front and rear axles, a balancing machine must have at least three swing frames, which is the minimum requirement.
6、 The weight of the machine base
It should be said that regardless of the type of balancing machine, the larger the weight of the base, the better. However, it should be pointed out that the component of the machine base does not affect the balance accuracy, but mainly affects the weight reduction rate. When requesting the same situation, the base of a soft supported balancing machine can be reduced several times compared to a hard supported one. At present, the cost of the machine base accounts for a large proportion of the total cost of the balancing machine. So, when you are concerned about price, you should prioritize using a soft support balancing machine.
7、 Alignment of the main axis of the swing frame
There is a main shaft on each of the two swing frames. Specifically, whether these two main shafts are aligned or not does not affect the balance effect, which is determined by the characteristics of the transmission shaft. Due to the significant displacement of the two end blueprints of the transmission shaft when working in a car (otherwise the universal joint would be useless), if the two main shafts of the balancing machine are requested to deviate from the same center, it will not match the actual working conditions of the transmission shaft. For two swing frame balancing machines with adjacent protruding elements in direct operation, in order to compensate for design flaws and reduce individual phenomena when balancing the front drive shaft, the two main shafts must be strictly controlled (in reality, even if the two main shafts reach the offset, as long as the end face runout of the protruding element is not zero, individual phenomena will still occur). If you buy a three swing or four swing balancing machine, there are no such problems at all. It no longer requires two main shafts to be offset, but agrees to balance the transmission shaft under near real working conditions, which can achieve better results
When balancing a transmission shaft with a bridge bearing, if one focuses on making the core of the bridge bearing slightly misaligned with the core line of the balancing machine spindle, not only will it not affect the accuracy of balancing, but there is also an unexpected benefit: if the protruding fork is asymmetric (i.e. the core of the cross shaft is offset), after balancing is completed, the swing frame will retain a longitudinal vibration, which will prompt the user to sharpen the protruding fork. If the core of the bridge bearing completely overlaps with the core line of the balancing machine spindle, or if the large nut at the protruding element is not installed, it will cause problems such as misalignment. The ultimate effect is to shorten the lifespan of the transmission shaft rubber sleeve.
From this, it can be seen that keeping the transmission shaft in a (non concentric) state on the car as much as possible during dynamic balancing is beneficial for improving the quality of balance. Some balancing machine manufacturers do not understand this principle and have created two swing frame balancing machines with high requirements for concentricity. Although losing one swing frame can reduce some costs, it does not have good performance and brings difficulties to users.
8、 The benefits of secondary computation
Some balancing machines have a function called 'quadratic operation'. With this feature, it will be more convenient to use. If the desired effect is not achieved after patching, there is no need to move the balance block based on experience like other manufacturers' balance machines. Instead, the computer will directly tell you the more suitable angle and weight. It is very convenient to use and can also improve work efficiency.
9、 Joint Balance
You must have encountered this problem when using other balancing machines: even after installing the balanced transmission shaft, there is still vibration. This is mainly caused by the jumping error of the middle protruding element. Often, multiple replacements of the middle flange cannot solve the problem. This kind of error cannot be balanced on a regular balancing machine. The solution is joint balance. The so-called joint balancing is to install two or three transmission shafts on a balancing machine and connect them together for balancing. In this way, the state during balancing is exactly the same as the actual state, thus achieving very good results.
10、 Soft support or hard support
Dynamic balancing machines are generally divided into two types: soft support and hard support. The swing frame of soft support balancing machines is relatively soft. During the process of starting and stopping the transmission shaft, there will be significant vibration in the soft supported swing frame, while there is no such phenomenon in the hard supported swing frame. In theory, a soft support balancing machine can achieve higher testing accuracy. But it can only be distinguished through extremely rigorous testing. For the transmission shaft dynamic balancing machine, the accuracy that can be achieved by hard support far exceeds the practical needs. If the accuracy of creating a transmission shaft dynamic balancing machine cannot meet the customer's requirements, it must be the result of other components. Among the components that affect balance accuracy, soft and hard supports are only a small part.
When you want to purchase a transmission shaft dynamic balancing machine, you may feel confused about the various balancing machines and numerous prices on the market. Even if you have been operating a balancing machine for many years, you may not have a clear distinction between its good and bad qualities. If you only listen to the manufacturer's introduction, you may spend a high price to buy a balance machine that is not very suitable for yourself.
1、 The influencing components of precision unevenness:
Due to the use of microcomputer technology by all manufacturers, the technology has become very mature, and the errors generated by the electronic measurement part are almost negligible. The relationship between the accuracy of the transmission shaft dynamic balancing machine and the electronic part is already very small. The two most important influencing components are the connection between the transmission shaft and the balancing machine. The second is to balance the machining accuracy of the spindle of the balancing machine.
2、 Factors affecting weight loss rate
If the weight reduction rate of the balancing machine is relatively high, it can be balanced with fewer rotations. The factors affecting the weight reduction rate are:
1. Is the calibration of the balancing machine accurate.
2. Is the weight and position of the placed balance block accurate.
3. The gap size between the cross shaft of the transmission shaft and the telescopic sliding key.
3、 Low speed and high speed
The balancing machine with soft support must reach a speed of at least three times the resonance speed in order to detect (the higher the speed, the higher the weight reduction rate), so some individual machines use higher speeds. Hard supported balancing machines must operate at a speed below three times the resonance speed, so some use lower speeds (especially for heavy-duty drive shafts). The unevenness of the rotational speed is also related to the flexibility of the sensor used. If a sensor with high flexibility is used, a lower rotational speed can be used. In the maintenance industry, if a lower speed is used, drivers often consider the outcome of balance, so there is a trend towards forward speed. When balancing heavy transmission shafts, the speed of the hard supported balancing machine is occasionally low, and drivers easily doubt the outcome of balancing, which has led to the popularity of soft supported balancing machines. When choosing a balancing machine, don't just ask how high the mechanical speed can reach, but also clarify the speed that can be achieved when balancing large transmission shafts such as Steyr.
4、 Digital display and wattmeter display
The performance of a balancing machine is basically unrelated to display design, but digital display is not only intuitive, but also has the highest reliability, is not easily damaged, and can provide some useful additional functions. Therefore, digital display is the mainstream standard policy. The wattmeter display system will gradually exit the market. It is also beneficial for balancing computer monitors. Its only advantage is that it appears more stylish and suitable for large users, but its complexity is much higher and reliability will significantly decrease (the more complex the tool, the more likely it is to malfunction). Small users should avoid using it.
5、 Distinguishing between different connection arrangements
The adjacent arrangement referred to here refers to the connection arrangement between the rear end (with a bridge bearing) of the front drive shaft (or middle drive shaft) and the balancing machine. This issue is crucial to the performance of the balancing machine, and neglecting it is a big taboo when choosing a balancing machine. At present, there are several types of connection systems available:
The first type is double roller support, which is generally used for hard supported balancing machines, and this type of preparation has better accuracy. The disadvantage is that it cannot monitor the status of the bridge bearing during operation, cannot reflect the eccentricity of the protruding fork (see later introduction), and is not easy to detect the jumping amount of the protruding element.
The second method is to directly use bridge bearing hangers for support, which is most suitable for practical working conditions and balances the site the best. And it can conveniently detect the runout of the protruding element, as well as monitor the torsion and noise of the bridge bearing. Sometimes it can also prevent the disassembly and assembly of bridge bearings, making the work the most effortless.
The third method is to directly connect the middle protruding element, which is bolted directly to the right swing frame. This is the most commonly used solution. For this type of balancing machine, if you do a few more tests yourself, you will understand how serious its problems are. You install the front drive shaft onto the balancing machine and use a dial gauge to check the runout of the (bridge bearing) journal. The magnitude of this runout determines the true balance effect. The amount of runout here is equivalent to the amount of runout of the spindle of the balancing machine. When performing dynamic balancing, the core of the middle protruding element stop is the rotating core. After being installed on the car, the rotating core becomes the axis of the bridge bearing (point A). The axis of balance is not consistent with the axis of actual work, which will inevitably cause errors. A large amount of maintenance data confirms that errors caused by such axis transformations are generally between 30 and 100 grams. When operating this type of balancing machine, you will also find a strange phenomenon that if the sliding key of the middle protruding element is tightly matched, the balancing result will be very poor, or even impossible to balance at all. Due to the fact that this type of balancing machine must rely on the clearance of the middle protruding element sliding key to solve the problem of walking stiffness, without clearance, the sliding key will be stiff and naturally unable to work.
In order to achieve the desired effect when balancing the front drive shaft, special attention should be paid when choosing a contiguous configuration. In order to be suitable for both the front and rear axles, a balancing machine must have at least three swing frames, which is the minimum requirement.
6、 The weight of the machine base
It should be said that regardless of the type of balancing machine, the larger the weight of the base, the better. However, it should be pointed out that the component of the machine base does not affect the balance accuracy, but mainly affects the weight reduction rate. When requesting the same situation, the base of a soft supported balancing machine can be reduced several times compared to a hard supported one. At present, the cost of the machine base accounts for a large proportion of the total cost of the balancing machine. So, when you are concerned about price, you should prioritize using a soft support balancing machine.
7、 Alignment of the main axis of the swing frame
There is a main shaft on each of the two swing frames. Specifically, whether these two main shafts are aligned or not does not affect the balance effect, which is determined by the characteristics of the transmission shaft. Due to the significant displacement of the two end blueprints of the transmission shaft when working in a car (otherwise the universal joint would be useless), if the two main shafts of the balancing machine are requested to deviate from the same center, it will not match the actual working conditions of the transmission shaft. For two swing frame balancing machines with adjacent protruding elements in direct operation, in order to compensate for design flaws and reduce individual phenomena when balancing the front drive shaft, the two main shafts must be strictly controlled (in reality, even if the two main shafts reach the offset, as long as the end face runout of the protruding element is not zero, individual phenomena will still occur). If you buy a three swing or four swing balancing machine, there are no such problems at all. It no longer requires two main shafts to be offset, but agrees to balance the transmission shaft under near real working conditions, which can achieve better results
When balancing a transmission shaft with a bridge bearing, if one focuses on making the core of the bridge bearing slightly misaligned with the core line of the balancing machine spindle, not only will it not affect the accuracy of balancing, but there is also an unexpected benefit: if the protruding fork is asymmetric (i.e. the core of the cross shaft is offset), after balancing is completed, the swing frame will retain a longitudinal vibration, which will prompt the user to sharpen the protruding fork. If the core of the bridge bearing completely overlaps with the core line of the balancing machine spindle, or if the large nut at the protruding element is not installed, it will cause problems such as misalignment. The ultimate effect is to shorten the lifespan of the transmission shaft rubber sleeve.
From this, it can be seen that keeping the transmission shaft in a (non concentric) state on the car as much as possible during dynamic balancing is beneficial for improving the quality of balance. Some balancing machine manufacturers do not understand this principle and have created two swing frame balancing machines with high requirements for concentricity. Although losing one swing frame can reduce some costs, it does not have good performance and brings difficulties to users.
8、 The benefits of secondary computation
Some balancing machines have a function called 'quadratic operation'. With this feature, it will be more convenient to use. If the desired effect is not achieved after patching, there is no need to move the balance block based on experience like other manufacturers' balance machines. Instead, the computer will directly tell you the more suitable angle and weight. It is very convenient to use and can also improve work efficiency.
9、 Joint Balance
You must have encountered this problem when using other balancing machines: even after installing the balanced transmission shaft, there is still vibration. This is mainly caused by the jumping error of the middle protruding element. Often, multiple replacements of the middle flange cannot solve the problem. This kind of error cannot be balanced on a regular balancing machine. The solution is joint balance. The so-called joint balancing is to install two or three transmission shafts on a balancing machine and connect them together for balancing. In this way, the state during balancing is exactly the same as the actual state, thus achieving very good results.
10、 Soft support or hard support
Dynamic balancing machines are generally divided into two types: soft support and hard support. The swing frame of soft support balancing machines is relatively soft. During the process of starting and stopping the transmission shaft, there will be significant vibration in the soft supported swing frame, while there is no such phenomenon in the hard supported swing frame. In theory, a soft support balancing machine can achieve higher testing accuracy. But it can only be distinguished through extremely rigorous testing. For the transmission shaft dynamic balancing machine, the accuracy that can be achieved by hard support far exceeds the practical needs. If the accuracy of creating a transmission shaft dynamic balancing machine cannot meet the customer's requirements, it must be the result of other components. Among the components that affect balance accuracy, soft and hard supports are only a small part.
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