In today's article, Huake Zhichuang Dynamic Balancing Machine mainly teaches you how to choose a special balancing machine for the transmission shaft 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 in transmission shaft manufacturers. In mid to low priced products, the situation is more complex, but it is never the case that the higher the price, the better the quality. Sometimes, you may buy a difficult to use balancing machine at a higher price. To avoid spending money on regrets, you should find more people who have used different types of balancing machines and consult their usage experience. Make more comparisons before making a decision.
When you want to purchase a transmission shaft dynamic balancing machine, you may feel confused about the various types of balancing machines and numerous prices in the market. Even if you have been operating a balancing machine for many years, you may not have a clear understanding of their differences in quality. If you only listen to the manufacturer's introduction, you may spend a high price to buy back a balance machine that is not suitable for you.
1、 The impact components of precision unevenness:
Due to the adoption of microcomputer technology by all manufacturers, the technology has become very mature, and the errors generated by the electronic measurement part are already negligible. The relationship between the accuracy of the transmission shaft dynamic balancing machine and the electronic part is already very small. The most important influencing factor is the connection system between the transmission shaft and the balancing machine. The second is the machining accuracy of the balance machine spindle.
2、 The influencing factors of weight loss rate
If the weight reduction rate of the balancing machine is relatively high, it can be achieved with fewer rotations. The factors that affect 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 clearance size between the transmission shaft cross shaft and the telescopic sliding key.
3、 Low speed and high speed
The balance machine with soft support must have a rotational speed that is more than three times the resonance speed in order to detect (the higher the rotational speed, the higher the weight loss rate), so individual machines use higher rotational speeds. Hard supported balancing machines must operate at speeds below 3 times the resonant speed, so some use lower speeds (especially for heavy-duty transmission shafts). The unevenness of the rotational speed is also related to the activity of the sensor used. If a sensor with high activity is used, a lower rotational speed can be used. In the maintenance industry, if a lower speed is used, drivers often consider the end result of balancing, so there is a trend towards forward speed. When balancing heavy transmission shafts, the speed of hard support balancing machines is relatively low, which makes drivers easily doubt the outcome of balancing, which leads to the best-selling of soft support balancing machines. When choosing a balancing machine, don't just ask how high the mechanical speed can reach, but also ask for a clear understanding of 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 the display system, but digital display is not only intuitive, but also has the highest reliability and is not easily damaged. It can also provide some useful additional functions, so digital display is the mainstream standard policy. The watt meter shows that the system will gradually withdraw from the market. It is also beneficial for balancing computer monitors. Its only advantage is that it appears stylish and suitable for large users. However, its complexity is much higher, and its reliability will greatly decrease (the more complex the tool, the easier it is to malfunction). Small users should avoid using it.
5、 Differentiation of different connection arrangements
The adjacent system referred to here refers to the connection system between the rear end of the front transmission shaft (or middle transmission shaft) (one end with a bridge bearing) and the balancing machine. This issue is crucial for the performance of a balancing machine, and neglecting it is a major taboo when choosing a balancing machine. At present, there are several types of connection arrangements available:
The first type is a double roller support, which is usually a hard support balancing machine. This type of system 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 element fork (see later introduction), and will not facilitate the detection of the jumping amount of the protruding element.
The second method is to directly use bridge bearing hangers for support, which is the closest to actual working conditions and the best balance on-site. Moreover, 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 work the most labor-saving.
The third method is to directly connect the middle protruding element, which is directly bolted to the right swing frame, which is the most commonly used solution. For this type of balancing machine, if you take a few more tests yourself, you will understand how serious the problem is. You install the front transmission shaft onto the balancing machine and use a dial gauge to check the runout of the axle journal. The magnitude of this runout determines the true effect of balancing. 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 is the rotating core. After being installed in the car, the rotating core becomes the axis of the bridge bearing (point A). The inconsistency between the axis of balance and the axis of real work will inevitably cause errors. A large amount of maintenance data confirms that the error caused by this type of axis transformation is usually between 30 and 100 grams. When operating this type of balancing machine, you may also notice a strange phenomenon. If the sliding keys of the central protrusion are tightly matched, the balance result will be poor, or even impossible to balance at all. Due to the fact that this type of balancing machine must rely on the fit clearance of the middle protruding element sliding key to solve the problem of dry walking, the sliding key will become sluggish without clearance, and naturally cannot work.
In order to achieve ideal results when balancing the front transmission shaft, special attention should be paid when selecting the adjacent system. In order to fit both the front and rear axles, the balancing machine must have at least three swing frames, which is the minimum requirement.
6、 Component of the base
It should be said that no matter what type of balancing machine it is, the larger the weight of the base, the better. But it should be pointed out that the component of the base does not affect the balance accuracy, it mainly affects the weight reduction rate. When requesting the same situation, the base of the soft support balancing machine can be reduced several times compared to the hard support. At this moment, the cost of the machine seat 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、 Centrality of the pendulum spindle
There is a spindle on each of the two pendulums. 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 large deviation of the two blueprints of the transmission shaft when working on a car (otherwise the universal joint would be useless), if the two main shafts of the balancing machine are requested to deviate from the center, it will actually not match the actual working conditions of the transmission shaft. For two swing frame balancing machines with adjacent protrusions in direct operation, in order to compensate for design errors and reduce individual phenomena when balancing the front transmission shaft, the two main shafts must be strictly controlled (in reality, even if the two main shafts reach an offset, as long as the end face runout of the protrusion is not zero, individual phenomena will still occur). If you buy a three swing or four swing balancing machine, there is no such problem at all. It no longer requests the deviation of the two main shafts, 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 you focus on making the core of the bridge bearing and the core line of the balancing machine spindle slightly different, not only will it not affect the accuracy of balance, but there is also an unexpected gain: if the protruding fork is asymmetric (i.e. the core offset of the cross shaft), after the balance is completed, the pendulum will retain a longitudinal vibration, which will prompt the user to hone the protruding fork. If the core of the bridge bearing completely overlaps with the core line of the balance machine spindle, or if the large nut at the protruding element is not installed, such problems will be biased. The final effect is to shorten the lifespan of the transmission shaft rubber sleeve.
From this, it can be seen that keeping the transmission shaft in its (non concentric) state on the car during dynamic balancing is beneficial for improving the quality of balance. Some balance machine manufacturers do not understand this principle and have created two swing frame balance machines with high requirements for concentricity. Although missing one swing frame can reduce some costs, it lacks good performance and brings difficulties to users.
8、 The Benefits of Quadratic Operations
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 the placement, 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: after installing the balanced transmission shaft, there is still vibration. This is mainly caused by the jumping error of the protruding element. Frequent replacement of the flange cannot solve the problem. This type of error cannot be balanced on a regular balancing machine. The solution is joint balance. The so-called joint balancing refers to installing two or three transmission shafts onto a balancing machine and connecting them together for balancing. In this way, the state during balancing is exactly the same as the actual state, which can achieve 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 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, soft support balancing machines can achieve higher testing accuracy. It can only be distinguished through extremely careful testing. For transmission shaft dynamic balancing machines, the accuracy that hard supports can achieve far exceeds 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 ingredients. Among the components that affect balance accuracy, soft and hard supports are just a small part.
When you want to purchase a transmission shaft dynamic balancing machine, you may feel confused about the various types of balancing machines and numerous prices in the market. Even if you have been operating a balancing machine for many years, you may not have a clear understanding of their differences in quality. If you only listen to the manufacturer's introduction, you may spend a high price to buy back a balance machine that is not suitable for you.
1、 The impact components of precision unevenness:
Due to the adoption of microcomputer technology by all manufacturers, the technology has become very mature, and the errors generated by the electronic measurement part are already negligible. The relationship between the accuracy of the transmission shaft dynamic balancing machine and the electronic part is already very small. The most important influencing factor is the connection system between the transmission shaft and the balancing machine. The second is the machining accuracy of the balance machine spindle.
2、 The influencing factors of weight loss rate
If the weight reduction rate of the balancing machine is relatively high, it can be achieved with fewer rotations. The factors that affect 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 clearance size between the transmission shaft cross shaft and the telescopic sliding key.
3、 Low speed and high speed
The balance machine with soft support must have a rotational speed that is more than three times the resonance speed in order to detect (the higher the rotational speed, the higher the weight loss rate), so individual machines use higher rotational speeds. Hard supported balancing machines must operate at speeds below 3 times the resonant speed, so some use lower speeds (especially for heavy-duty transmission shafts). The unevenness of the rotational speed is also related to the activity of the sensor used. If a sensor with high activity is used, a lower rotational speed can be used. In the maintenance industry, if a lower speed is used, drivers often consider the end result of balancing, so there is a trend towards forward speed. When balancing heavy transmission shafts, the speed of hard support balancing machines is relatively low, which makes drivers easily doubt the outcome of balancing, which leads to the best-selling of soft support balancing machines. When choosing a balancing machine, don't just ask how high the mechanical speed can reach, but also ask for a clear understanding of 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 the display system, but digital display is not only intuitive, but also has the highest reliability and is not easily damaged. It can also provide some useful additional functions, so digital display is the mainstream standard policy. The watt meter shows that the system will gradually withdraw from the market. It is also beneficial for balancing computer monitors. Its only advantage is that it appears stylish and suitable for large users. However, its complexity is much higher, and its reliability will greatly decrease (the more complex the tool, the easier it is to malfunction). Small users should avoid using it.
5、 Differentiation of different connection arrangements
The adjacent system referred to here refers to the connection system between the rear end of the front transmission shaft (or middle transmission shaft) (one end with a bridge bearing) and the balancing machine. This issue is crucial for the performance of a balancing machine, and neglecting it is a major taboo when choosing a balancing machine. At present, there are several types of connection arrangements available:
The first type is a double roller support, which is usually a hard support balancing machine. This type of system 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 element fork (see later introduction), and will not facilitate the detection of the jumping amount of the protruding element.
The second method is to directly use bridge bearing hangers for support, which is the closest to actual working conditions and the best balance on-site. Moreover, 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 work the most labor-saving.
The third method is to directly connect the middle protruding element, which is directly bolted to the right swing frame, which is the most commonly used solution. For this type of balancing machine, if you take a few more tests yourself, you will understand how serious the problem is. You install the front transmission shaft onto the balancing machine and use a dial gauge to check the runout of the axle journal. The magnitude of this runout determines the true effect of balancing. 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 is the rotating core. After being installed in the car, the rotating core becomes the axis of the bridge bearing (point A). The inconsistency between the axis of balance and the axis of real work will inevitably cause errors. A large amount of maintenance data confirms that the error caused by this type of axis transformation is usually between 30 and 100 grams. When operating this type of balancing machine, you may also notice a strange phenomenon. If the sliding keys of the central protrusion are tightly matched, the balance result will be poor, or even impossible to balance at all. Due to the fact that this type of balancing machine must rely on the fit clearance of the middle protruding element sliding key to solve the problem of dry walking, the sliding key will become sluggish without clearance, and naturally cannot work.
In order to achieve ideal results when balancing the front transmission shaft, special attention should be paid when selecting the adjacent system. In order to fit both the front and rear axles, the balancing machine must have at least three swing frames, which is the minimum requirement.
6、 Component of the base
It should be said that no matter what type of balancing machine it is, the larger the weight of the base, the better. But it should be pointed out that the component of the base does not affect the balance accuracy, it mainly affects the weight reduction rate. When requesting the same situation, the base of the soft support balancing machine can be reduced several times compared to the hard support. At this moment, the cost of the machine seat 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、 Centrality of the pendulum spindle
There is a spindle on each of the two pendulums. 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 large deviation of the two blueprints of the transmission shaft when working on a car (otherwise the universal joint would be useless), if the two main shafts of the balancing machine are requested to deviate from the center, it will actually not match the actual working conditions of the transmission shaft. For two swing frame balancing machines with adjacent protrusions in direct operation, in order to compensate for design errors and reduce individual phenomena when balancing the front transmission shaft, the two main shafts must be strictly controlled (in reality, even if the two main shafts reach an offset, as long as the end face runout of the protrusion is not zero, individual phenomena will still occur). If you buy a three swing or four swing balancing machine, there is no such problem at all. It no longer requests the deviation of the two main shafts, 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 you focus on making the core of the bridge bearing and the core line of the balancing machine spindle slightly different, not only will it not affect the accuracy of balance, but there is also an unexpected gain: if the protruding fork is asymmetric (i.e. the core offset of the cross shaft), after the balance is completed, the pendulum will retain a longitudinal vibration, which will prompt the user to hone the protruding fork. If the core of the bridge bearing completely overlaps with the core line of the balance machine spindle, or if the large nut at the protruding element is not installed, such problems will be biased. The final effect is to shorten the lifespan of the transmission shaft rubber sleeve.
From this, it can be seen that keeping the transmission shaft in its (non concentric) state on the car during dynamic balancing is beneficial for improving the quality of balance. Some balance machine manufacturers do not understand this principle and have created two swing frame balance machines with high requirements for concentricity. Although missing one swing frame can reduce some costs, it lacks good performance and brings difficulties to users.
8、 The Benefits of Quadratic Operations
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 the placement, 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: after installing the balanced transmission shaft, there is still vibration. This is mainly caused by the jumping error of the protruding element. Frequent replacement of the flange cannot solve the problem. This type of error cannot be balanced on a regular balancing machine. The solution is joint balance. The so-called joint balancing refers to installing two or three transmission shafts onto a balancing machine and connecting them together for balancing. In this way, the state during balancing is exactly the same as the actual state, which can achieve 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 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, soft support balancing machines can achieve higher testing accuracy. It can only be distinguished through extremely careful testing. For transmission shaft dynamic balancing machines, the accuracy that hard supports can achieve far exceeds 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 ingredients. Among the components that affect balance accuracy, soft and hard supports are just a small part.
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