JP3759437B2 - Motor torque inspection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a motor torque inspection apparatus, and more particularly to a torque inspection apparatus suitable for use in a work site for inspecting both a torque in a voltage non-application state and a torque in a predetermined voltage application state of a motor that is a detection object. .
[0002]
[Prior art]
Normally, even with the same type of motor, the generated torque varies slightly, so at the assembly site of a product that incorporates a motor, the torque of each motor is inspected in advance to adversely affect product performance. Do not use a motor that may be affected. For example, even when no driving voltage is applied to the motor, a force against the sliding resistance is required to rotate the rotating shaft. If this sliding resistance is too large, no voltage is applied. Since the performance of the product during heating is impaired, it is often inspected beforehand whether the torque (no load torque) when the voltage to be applied to the motor to be incorporated is not applied is kept below an allowable value. In order to guarantee the maximum output of the product, it is necessary to inspect whether the torque (maximum set torque) when a predetermined maximum drive voltage is applied to the motor has reached a desired value.
[0003]
In performing such a motor torque inspection, conventionally, for example, by arranging a no-load torque inspection device and a maximum set torque inspection device in parallel, the no-load torque and the maximum set torque of each motor are continuously provided. Was measured. As a no-load torque inspection device, there is known a configuration in which a light weight having a predetermined weight is connected to a rotating shaft of a motor via a wire or a pulley, and the weight of the weight rotates the motor when no voltage is applied. If the shaft rotates, it is determined that the no-load torque is a small value equal to or less than the allowable upper limit value. Further, as a maximum set torque inspection device, a configuration in which a slightly heavy weight having a predetermined weight is connected to a rotating shaft of a motor via a wire or a pulley is known, and when a maximum driving voltage is applied to the motor If the weight can be lifted, it is determined that the maximum set torque is a value greater than or equal to the allowable lower limit value.
[0004]
[Problems to be solved by the invention]
In the conventional torque inspection method performed to determine whether or not the no-load torque and the maximum set torque of each motor are acceptable, as described above, two devices, the no-load torque inspection device and the maximum set torque inspection device, are required. Even if these two devices are arranged side by side, after setting the motor, which is the object to be detected, in one device and finishing one inspection, this motor is set in the other device and the other device Therefore, there is a problem that the inspection time is prolonged. Further, when two inspection devices are arranged in parallel, the overall size of the inspection device becomes considerably large, so that a large installation space is required.
[0005]
The present invention has been made in view of the actual situation of the prior art, and an object of the present invention is to make it possible to determine whether a motor's no-load torque and maximum set torque pass or fail efficiently in a short time with a single device. It is to provide a torque inspection device.
[0006]
[Means for Solving the Problems]
The above-described object of the present invention includes a pulley attached to a rotating shaft of a motor that is a detection object, a main wire that is attached to one end of the pulley so as to be wound around and the other end is suspended vertically. A first weight suspended from the other end of the main wire; a second weight that is heavier than the first weight and disposed below the first weight; and the first and second weights. A connection wire for connecting the weight of the first weight, a support member capable of removing the tension of the connection wire by supporting the second weight, and the first weight with its own weight when no drive voltage is applied to the motor. A first sensor for detecting whether or not the first weight is lowered to a height position of 1, and when the predetermined driving voltage is applied to the motor, the first weight or the second weight is a second height A second sensor for detecting whether or not it has been pulled up to the vertical position The weight of the first weight is set to a size corresponding to an allowable upper limit value of the torque when no voltage is applied to the motor, and the sum of the weights of the first and second weights is set in the motor. This is achieved by setting the magnitude corresponding to the allowable lower limit value of the torque when the drive voltage is applied.
[0007]
In the torque inspection device configured as described above, a voltage is applied to the motor to which the pulley is attached to rotate the rotation shaft in a state where the second weight is supported by the support member and the tension of the connecting wire is removed. Then, as the main wire is wound around the pulley, the first weight is pulled up, and when the first weight is pulled up to some extent, the looseness of the connecting wire is eliminated. Then, when a predetermined maximum driving voltage is applied to the motor, it can be detected by the second sensor whether or not the second weight is pulled up via the connecting wire. Pass / fail of the maximum set torque of each motor can be determined. In addition, after checking the maximum set torque in this way, when the voltage supply to the motor is stopped and the first and second weights are lowered, the second weight reaches the support member and the connecting wire When the tension is removed, since only the weight of the first weight is the force that rotates the rotating shaft of the motor, the first sensor detects whether the first weight is lowered by its own weight. Whether or not the no-load torque of each motor is acceptable can be determined based on the presence or absence of this detection signal. As a result, it is possible to efficiently determine whether the maximum set torque of the motor and the no-load torque have passed or not in a short time by preparing only one inspection device having a simple configuration.
[0008]
Further, the torque inspection apparatus described above includes a third sensor for detecting whether or not the first weight has been lifted to the third height position when performing the pull-up test. When the first weight is pulled up to the position, the looseness of the connecting wire is substantially eliminated, and the main wire is wound around the pulley one or more times. The torque of the motor is suppressed until the weight reaches the third height position, and when the first weight reaches the third height position, the maximum drive voltage is applied to the motor to increase the torque. Can be used. As a result, it is possible to prevent the first weight and the second weight from shaking when the looseness of the connecting wire is eliminated at once, and to prevent an excessive force from being applied to the connection portion between the main wire and the pulley. So reliability is improved.
[0009]
Furthermore, the torque inspection apparatus described above includes a fourth sensor for detecting whether or not the first weight has been lifted to the fourth height position when performing the pulling test. If the supply of the driving voltage is stopped when the first weight is pulled up to the height position, an excessive rise (overrun) of the first weight can be prevented, so that during the pulling test There is no need to worry about the first weight causing a collision.
[0010]
In any of the above-described configurations, if the first weight includes a box-shaped body and a plurality of lightweight weights mounted on the box-shaped body, the first weight is caused by its own weight during the descent test. By removing the lightweight weight from the first weight lowered to the position as appropriate, the weight of the first weight when it floats from the first height position can be known, so only pass / fail judgment of no-load torque Instead, it is possible to measure the value of the no-load torque itself.
[0011]
Similarly, if the second weight is formed in a box shape and has a plurality of lightweight weights that can be mounted on the box weight, the second weight is lifted to the second height position during the pulling test. By appropriately adding the light weight to the second weight, it is possible to know the additional weight of the light weight when it is not possible to reach the second height position even when the maximum driving voltage is applied. Not only the pass / fail judgment of the maximum set torque but also the value of the maximum set torque itself can be measured.
[0012]
Furthermore, if the above-described torque inspection apparatus includes wire lock means that can selectively fix the main wire, the wire lock means is operated to attach and detach the pulley to the rotating shaft of the motor. By suppressing the movement, it is possible to prevent the main wire from coming off from the intermediate path, and it is possible to easily perform the attaching / detaching operation.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment of the invention will be described. FIG. 1 is an explanatory view showing an initial state before the start of inspection of an inspection apparatus according to an embodiment of the present invention, and FIG. FIG. 3 is an explanatory view showing a state of determining whether the set torque is acceptable, FIG. 3 is an explanatory view showing a state of determining whether the unloaded torque of the motor is acceptable or not, and FIG. 4 is related to another embodiment. FIG. 5 is an explanatory view showing a main part of an inspection apparatus according to another embodiment, and FIG. 5 is an explanatory view showing a first weight and a second weight of the inspection apparatus.
[0014]
1 to 3 includes a workpiece fixing base 1 for fixing a motor 20 that is a detection target, a pulley 2 attached to a rotating shaft 21 of the motor 20, and a pulley 2 that locks the pulley 2. The lock means 3 that can set the rotation shaft 21 in a non-rotatable state, the main wire 4 that is attached to one end of the pulley 2 so as to be wound and the other end is suspended in the vertical direction, and the movement of the main wire 4 A bearing 5 for smoothly changing the direction, a first weight 6 suspended from a suspended portion of the main wire 4, a receiving member 7 on which the first weight 6 is mounted, and a first weight 6 A second weight 8 that is heavier than the first weight 6 and is disposed below the first weight 6, a connection wire 9 that connects the first and second weights 6 and 8, and a second weight 8 are mounted. Support base 10, first to fourth sensors 11 to 14, and main wire 4 are selectively fixed. It is schematically constituted by a wire locking means 15 and the wire fixing base 16 as possible.
[0015]
The work fixing base 1 is provided with a storage portion 1a for storing a motor 20 as a detection target, and the motor 20 is fastened and fixed using a plurality of bolts 1b. The lock means 3 can be engaged with and disengaged from the pulley 2, and when the rotation shaft 21 of the motor 20 is not to be rotated, the rotation means 21 is set in a non-rotatable state by locking the lock means 3 to the pulley 2. be able to. The wire lock means 15 cooperates with the wire fixing base 16 to fix the main wire 4. At the time of torque inspection of the motor 20, the wire lock means 15 is sufficiently separated from the wire fixing base 16. The wire 4 is guided by each bearing 5 and can move. On the other hand, when attaching / detaching the pulley 2 to / from the rotary shaft 21 of the motor 20, the main wire 4 is sandwiched between the wire lock means 15 and the wire fixing base 16 by driving the wire lock means 15 downward. And become locked.
[0016]
The first weight 6 is a weight made of aluminum, for example, and its weight is set to a size corresponding to an allowable upper limit value of the no-load torque of the motor 20. The second weight 8 is, for example, a stainless steel weight having a weight about five times that of the first weight 6. The total weight of the first and second weights 6, 8 is the maximum set torque of the motor 20. Is set to a size corresponding to the allowable lower limit value. As shown in FIG. 1, the initial state before the inspection is started is that the first weight 6 is mounted on the receiving member 7 and the second weight 8 is mounted on the support base 10. The wire 9 is in a loose state.
[0017]
The first sensor 11 is an optical sensor for detecting whether or not the first weight 6 is lowered to the height position A by its own weight in a state where no driving voltage is applied to the motor 20. Used during load torque inspection. The second sensor 12 is an optical sensor for detecting whether or not the bottom surface of the second weight 8 is pulled up to the height position B in a state where a predetermined maximum driving voltage is applied to the motor. Used during set torque inspection. The third sensor 13 is an optical sensor for detecting whether or not the first weight 6 has been pulled up to the height position C. The third sensor 13 is used when the maximum set torque of the motor 20 is inspected. When one weight 6 is pulled up, the looseness of the connecting wire 9 is almost eliminated. The fourth sensor 14 is an overrun prevention optical sensor that detects whether or not the first weight 6 is pulled up to the height position D. When the first weight 6 is pulled up to the height position D, The voltage supply to the motor 20 is automatically stopped.
[0018]
In the torque inspection apparatus configured as described above, the motor 20 as the detection target is fixed to the work fixing base 1 and the pulley 2 is attached to the rotating shaft 21, and then the maximum drive voltage is first applied to the motor 20. Thus, the maximum set torque is inspected, and subsequently, the voltage supply to the motor 20 is stopped and the no-load torque can be inspected.
[0019]
More specifically, first, in the state of FIG. 1, a voltage smaller than the maximum drive voltage is applied to the motor 20, and the main wire 4 is wound around the pulley 2 that is rotationally driven by the rotary shaft 21. Then, the first weight 6 is pulled up to the main wire 4, and when the first weight 6 reaches the height position C as shown in FIG. The main wire 4 is wound around the pulley 2 one or more times. When the first weight 6 reaches the height position C, the light of the third sensor 13 is blocked and a detection signal is output. Based on this signal, a predetermined maximum drive voltage is applied to the motor 20. As a result, the main wire 4 pulls the first weight 6 further upward, and the connection wire 9 pulls the second weight 8 upward accordingly. Therefore, if the maximum set torque of the motor 20 that is the detection target is larger than the allowable lower limit value, the first and second weights 6 and 8 are raised, and as shown in FIG. Then, the light from the sensor 12 is released and the detection signal is output. If a detection signal is output from the second sensor 12, it is determined that the maximum set torque of the motor 20 is not insufficient. If the detection signal is not output, the motor 20 has a shortage of the maximum set torque. It is determined that the product is defective.
[0020]
In the second weight 8 pull-up test, the second sensor 12 is disposed at the height position B that directly detects the rise of the second weight 8 in the present embodiment. The rising of the first weight 6 may be detected by a sensor arranged at a predetermined position above the. Further, in the present embodiment example, when the first weight 6 is pulled up to the height position D, the voltage supply to the motor 20 is automatically stopped, so that the first weight 6 is excessively raised (overrun). ) Can be prevented, and there is no fear of the first weight 6 causing a collision accident during the pull-up test.
[0021]
Next, after determining whether or not the maximum set torque is acceptable, when the supply of voltage to the motor 20 is stopped, the first and second weights 6 and 8 are lowered by their own weights. Reaches the support 10 and the tension of the connecting wire 9 is removed, and thereafter, only the weight of the first weight 6 becomes a force for rotating the rotating shaft 21 of the motor 20. Therefore, if the no-load torque of the motor 20 that is the detection target is smaller than the allowable upper limit value, the first weight 6 is lowered onto the receiving member 7, and as shown in FIG. The light is blocked and a detection signal is output. If the detection signal is output from the first sensor 11, it is determined that the no-load torque of the motor 20 is sufficiently small. If the detection signal is not output, the motor 20 has too much no-load torque. It is determined that the product is defective.
[0022]
As described above, according to the present embodiment, it is possible to efficiently and continuously determine whether or not the maximum set torque of the motor 20 is acceptable and whether or not the no-load torque is acceptable simply by preparing one inspection device having a simple configuration. Therefore, the work time required for the torque inspection can be greatly shortened. Further, the installation space can be reduced as compared with the case where two inspection apparatuses are arranged side by side. Furthermore, when attaching / detaching the pulley 2 to / from the rotating shaft 21 of the motor 20, if the wire lock means 15 is operated to suppress the movement of the main wire 4, the main wire 4 comes off from the intermediate path such as the bearing 5. Therefore, it is possible to easily and reliably perform the attaching / detaching work.
[0023]
Furthermore, in the present embodiment, when the maximum set torque is inspected, the third sensor 13 disposed at the height position C substantially eliminates the looseness of the connecting wire 9 and the main wire 4 is connected to the pulley 2. Therefore, the torque of the motor 20 is suppressed until the first weight 6 reaches the height position C, and the first weight 6 reaches the height position C. At this time, a method of applying a maximum drive voltage to the motor 20 to increase the torque is employed. Therefore, it is possible to prevent the first weight 6 and the second weight 8 from shaking when the looseness of the connecting wire 9 is eliminated at a stretch, and an excessive force is applied to the connecting portion between the main wire 4 and the pulley 2. High reliability can be secured without adding.
[0024]
Further, if a weight having a variable weight as shown in FIG. 4 is used, not only the pass / fail judgment of the maximum set torque and the no-load torque of the motor 20 but also the torque value can be measured. That is, as shown in FIG. 4B, if the second weight 8 is formed in a box shape and a plurality of lightweight weights 17 that can be mounted on the box-shaped second weight 8 are prepared, the maximum weight is obtained. A lightweight weight 17 is appropriately added to the second weight 8 pulled up to the height position B when the set torque is inspected, thereby reducing the weight when the height position B cannot be reached even when the maximum drive voltage is applied. Since the additional weight of the weight 17 can be known, not only the pass / fail judgment of the maximum set torque but also the value of the maximum set torque itself can be measured. As shown in FIG. 4 (a), if the first weight 6 is composed of a box-shaped body 6a and a plurality of lightweight weights 6b mounted on the box-shaped body 6a, the no-load torque can be inspected. Since the light weight 6b is appropriately removed from the first weight 6 lowered to the height position A by its own weight, the weight of the first weight 6 when it floats from the height position A can be known. It is possible to measure not only the load torque pass / fail judgment but also the value of the no-load torque.
[0025]
In the embodiment described above, the case where the pulley 2 is directly attached to the rotating shaft 21 of the motor 20 for inspection has been described. It can also be applied to. That is, as shown in FIG. 5, in the case of the motor 20 having the gear 22 attached to the rotating shaft 21, a recess having the same shape as the gear 22 is formed in the pulley 2, and the gear 22 is inserted into the recess. The pulley 2 may be attached to the rotating shaft 21 of the motor 20 via the gear 22. At that time, if the pulley 2 is provided with a pair of locking members 23 so as to be rotatable, and the locking members 23 are configured to be urged in the direction of the arrow by a spring or the like (not shown), the locking member 23 is a gear. By engaging with the lower surface of 22, it is possible to securely lock the pulley 2 from coming out of the gear 22 on the motor 20 side, and when the pulley 2 is attached or detached, the engaging member 23 is against the spring force of a spring or the like and is opposite to the arrow. By rotating in the direction, the locked state can be released.
[0026]
【The invention's effect】
The present invention is implemented in the form as described above, and has the following effects.
[0027]
When a predetermined maximum drive voltage is applied to the motor to be detected, the sensor detects whether the lower weight is lifted, thereby determining whether the maximum set torque of the motor is acceptable, By stopping the voltage supply to the motor and lowering the upper and lower weights and removing the tension of the connecting wire, the sensor detects whether or not the upper weight has been lowered by its own weight. Can be judged. As a result, it is possible to efficiently determine whether the maximum set torque of the motor and the no-load torque have passed or not in a short time by preparing only one inspection device having a simple configuration.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram illustrating an initial state of an inspection apparatus according to an embodiment of the present invention before starting inspection.
FIG. 2 is an explanatory view showing a state in which the inspection device determines whether or not the maximum set torque of the motor is acceptable.
FIG. 3 is an explanatory diagram showing a state in which the inspection device determines whether or not a motor no-load torque is acceptable.
FIG. 4 is an explanatory view showing a first weight and a second weight of an inspection apparatus according to another embodiment of the present invention.
FIG. 5 is an explanatory view showing a main part of an inspection apparatus according to another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Work fixing base 2 Pulley 3 Locking means 4 Main wire 5 Bearing 6 First weight 6a Box-shaped body 6b Light weight 7 Receiving member 8 Second weight 9 Connecting wire 10 Support base 11 First sensor 12 Second sensor 13 Third sensor 14 Fourth sensor 15 Wire lock means 16 Wire fixing base 17 Light weight 20 Motor 21 Rotating shaft

Claims (6)

A pulley attached to the rotating shaft of the motor, which is the detection target, a main wire having one end wound around the pulley and having the other end suspended vertically, and the other end of the main wire A first weight suspended from the first weight, a second weight that is heavier than the first weight and disposed below the first weight, and a connecting wire that connects the first and second weights. A support member capable of removing the tension of the connecting wire by supporting the second weight, and the first weight is lowered to the first height position by its own weight when no driving voltage is applied to the motor. A first sensor for detecting whether or not the first weight or the second weight is raised to a second height position when a predetermined drive voltage is applied to the motor A second sensor for detecting
The weight of the first weight is set to a size corresponding to an allowable upper limit value of the torque when no voltage is applied to the motor, and the sum of the weights of the first and second weights is set in the motor. A torque inspection apparatus for a motor, characterized in that it is set to a magnitude corresponding to an allowable lower limit value of torque when the drive voltage is applied. 2. The first weight according to claim 1, further comprising a third sensor for detecting whether or not the first weight has been pulled up to a third height position, wherein the first weight is reached to the third height position. The motor torque inspection device is configured such that when the wire is pulled up, the looseness of the connecting wire is substantially eliminated and the main wire is wound around the pulley one or more times. 3. The method according to claim 1, further comprising: a fourth sensor for detecting whether or not the first weight has been pulled up to a fourth height position, and the first sensor up to the fourth height position. A motor torque inspection device configured to stop the supply of the drive voltage when the weight of the motor is pulled up. 4. The torque inspection apparatus for a motor according to claim 1, wherein the first weight includes a box-shaped body and a plurality of lightweight weights mounted on the box-shaped body. The motor according to any one of claims 1 to 4, wherein the second weight is formed in a box shape, and includes a plurality of lightweight weights that can be mounted on the box weight. Torque inspection device. 6. The motor torque inspection device according to claim 1, further comprising wire lock means capable of selectively fixing the main wire.

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