TWI692625B - Method for measuring backlash, sensing device, and indexing device including the sensing device - Google Patents

Abstract

The present invention provides an indexing device comprising a housing, a loading plate, a sensing device, a spindle, and a transmission unit. The housing accommodates the sensing device, the spindle, and the transmission unit. The loading plate is coaxially disposed on the spindle. The transmission unit has a worm, a revolving plate, and a power assembly. The revolving plate is coaxially disposed on the spindle. The worm engages with and rotates the revolving plate, and the revolving plate further drives the spindle to rotate synchronously. The sensing device is configured to measure a backlash between the worm and the revolving plate. The sensing device comprises a driven element, a first detector, and a second detector. The driven element is disposed coaxially on the spindle. The driven element has an outer diameter surface, a first detected portion, and a second detected portion. The first detected portion and the second detected portion are spaced apart from each other on the outer diameter surface. The first detector and the second detector are located around the outer diameter surface and face the outer diameter surface. The first detector senses the first detected portion to measure the backlash. The second detector senses the second detected portion. When the second detector senses the second detected portion, the spindle is located at a zeroing position. The indexing device of the present invention can measure the backlash quickly and precisely. The indexing device can also measure the backlashes of different rotating positions and has zeroing function. Therefore, the indexing device of the present invention has the advantages of time-saving, labor-saving, and convenience for measuring backlash.

Description

Method for measuring backlash, sensing device and indexing plate device with the sensing device

An index plate device, especially an index plate device capable of measuring backlash.

With the development of the processing industry, processing tool machines are also gradually developing towards high precision. For example, the indexing plate device has extremely high requirements on the accuracy of the rotation angle. The conventional indexing device, such as TWM491544 patent No. 1 The indexing plate is installed on a CNC central processing machine. The indexing plate includes a housing, an output shaft rotary disk, a worm input shaft, and a motor. The housing accommodates the output shaft rotary disk and the worm input shaft. The output rotary disk meshes with the worm input shaft to rotate. The motor is installed in the housing and drives the worm input shaft to rotate around its own axis. However, the output rotary disk and the worm input shaft can continue to wear during the meshing rotation process After use for a period of time, backlash will occur, causing the rotation accuracy of the dial device to decrease.

The traditional method of measuring backlash is to manually measure the dial indicator. If the measured backlash is too large, the dial device needs to be disassembled to adjust the worm or replace the parts, and then repeat the measurement and adjustment with the dial indicator Until the backlash is eliminated. This kind of measurement and the method of eliminating backlash may produce human error, and the process is cumbersome and time-consuming and labor-intensive. If the accuracy of the dial indicator itself is not good, it will increase the measurement error. Further, during the measurement process, the dial device must be changed from a rotating state to a stationary state in order to read the scale. The process of this state transition may also cause errors. Furthermore, the degree of use varies according to the different rotating positions of the dial device The degree of wear is also different, so the size of the backlash at different rotation positions is also different. If you want to measure the backlash value at different rotation positions, it is even more difficult to complete by manpower alone.

One of the purposes of this creation is to provide a graduated dial device that uses a detector to measure the backlash, which can quickly measure the backlash and increase the accuracy of the measurement, and can measure the size of the backlash at different rotational positions. The function of zero detection makes the measurement process not only save time and effort, but also more convenient for users to use.

In order to achieve the above object, the present invention provides an indexing plate device, which includes a casing, a plate body, a sensing device, a main shaft and a transmission unit. The housing can accommodate the sensing device, the main shaft and the transmission unit. The disc body is located on one side of the housing. The disc body is coaxially disposed on the main shaft. The transmission unit drives the main shaft to rotate. The transmission unit has a worm, a turntable and a power assembly. The turntable is coaxially arranged on the main shaft. The worm meshes and drives the turntable to rotate. The assembly drives the worm to rotate. The sensing device is used to detect the backlash generated when the worm meshes and drives the turntable to rotate forward and backward. The sensing device includes a follower, a first detector, and a second detector. The moving part is coaxially arranged on the main shaft, the driven part has an outer diameter surface, a first tested part and a second tested part, and the first tested part and the second tested part are arranged at the interval The outer diameter surface of the follower, the first detector and the second detector are located around the outer diameter surface of the follower and toward the outer diameter surface, the first detector senses the first A measured part is used to measure the backlash. The second detector senses the second measured part. When the second detector senses the second measured part, the main shaft is at the zero position.

In some cases, the outer diameter surface of the follower has a plurality of first test parts, and the plurality of first test parts and the second test part are disposed at equal intervals on the follower OD surface.

In some cases, the first detector and the second detector face different axial positions of the follower.

In some cases, the first tested portion and the second tested portion are located at different axial positions of the follower.

In some cases, the first tested portion and the second tested portion protrude from the outer diameter surface of the follower.

In some cases, the length of the first tested portion along the axial direction of the follower is different from the second tested portion.

In some cases, the second measured portion further has a first measurement area and a second measurement area, the first measurement area is sensed by the first detector, and the second measurement area is detected by the second Sensing by the detector.

In some cases, the length of the first tested portion along the axis of the follower is smaller than that of the second tested portion, and the first measurement area and the first tested portion are located on the same axis of the follower To the position, the second measuring area and the first measured portion are located at different axial positions of the follower.

In this way, the index plate device provided by the present invention can sense the first and second tested parts of the follower through the first detector and the second detector, and can perform zeroing and measurement Worm meshing drives the backlash generated when the turntable rotates forward and backward, and the measured backlash value can be used to adjust the rotation data of the dial device to compensate. There is no need to manually measure or disassemble the dial device to adjust Worm or other parts, therefore, the dial device of this creation not only saves manpower and time, but also reduces the human error that may be generated by manual measurement, and ensures the accuracy of the measurement. Furthermore, the dial device of this creation can target The backlash is measured at different rotation positions, so the size of the backlash at different rotation positions can be accurately grasped.

This creation provides an index plate device with the functions of zeroing and measuring backlash. For the first embodiment of this creation, please refer to FIGS. 1 to 2. This embodiment includes a housing 10, a disc body 20, a sensing device 30, a spindle 40, and a transmission unit.

The casing 10 is substantially cylindrical, and the casing 10 accommodates the sensing device 30, the main shaft 40, and the transmission unit.

The disc body 20 is in the shape of a disc. The disc body 20 is located on the side of the housing 10. The disc body 20 is coaxially disposed on the spindle 40. The disc body 20 can load a workpiece, rotate the workpiece, and index the workpiece.

Please refer to FIGS. 3 and 4, the sensing device 30 includes a follower 31, a first tested part 32, a second tested part 33, a first detector 34 and a second detector 35, the follower 31 is coaxially disposed on the main shaft 40, the follower 31 has an outer diameter surface 311, three first test portions 32 and one second test portion 33 are uniformly looped on the outer diameter surface 311 at equal intervals from each other to measure different The backlash value of the rotation position, the first measured part 32 and the second measured part 33 protrude from the outer diameter surface 311, and the first measured part 32 and the second measured part 33 are, for example but not limited to, by bonding or welding Or integrally formed on the outer diameter surface 311, the length of the first test portion 32 along the axial direction of the follower 31 is smaller than the second test portion 33, and the second test portion 33 further has a first measurement area 331 and a second measurement Zone 332, the first measuring zone 331 and the first measured part 32 are located at the same axial position of the follower 31, when the follower 31 rotates, the first detector 34 can sense the first measured part 32 and The first measurement area 331. The second measurement area 332 and the first measured portion 32 are located at different axial positions of the follower 31. The second measurement area 332 is sensed by the second detector 35. It should be noted that the first measurement area 331 and the third The second measurement area 332 refers to different measurement areas, please refer to FIG. 3, the first measurement area 331 and the second measurement area 332 are divided by dotted lines to illustrate that the first measurement area 331 and the second measurement area 332 are different Sensed by the detector, the dashed line is not a line that actually exists. The first detector 34 and the second detector 35 are located around the outer diameter surface 311 of the follower 31 and face the outer diameter surface 311. The first detector 34 and the second detector 35 are, for example but not limited to, optical Detectors, the first detector 34 and the second detector 35 are directed to different axial positions of the outer diameter surface 311 to sense different axial positions, and the first detector 34 senses the first measured portion 32 and the first measurement area 331 to measure the backlash, the second detector 35 senses the second measurement area 332 of the second measured portion 33, when the second detector 35 senses the second measurement area 332, The spindle 40 is located at the zero position.

Please refer to Figs. 1 and 5, the transmission unit drives the main shaft 40 and the follower 31 to rotate. The transmission unit has a worm 50, a turntable 51 and a power assembly 52. The turntable 51 is, for example, a toothed disk or a roller cam. In this embodiment, The turntable 51 is a toothed plate, and the worm 50 rotatably engages the turntable 51. The turntable 51 is coaxially disposed on the main shaft 40. The power assembly 52 is, for example but not limited to, a motor. The power assembly 52 can drive the worm 50 to rotate.

When measuring the backlash of the index plate device of this embodiment, first perform a pre-step to rotate the worm 50 in a first direction, the first direction is, for example, a clockwise direction, the worm 50 rotates the turntable 51, and the turntable 51 further drives The main shaft 40 and the follower 31 rotate synchronously, and the first detector 34 senses the approach of the first measured part 32 or the first measurement area 331. At this time, the first detector 34 undergoes the first signal transformation. The worm 50 continues to rotate so that the first measured portion 32 or the first measurement area 331 passes by and away from the first detector 34. When the first detector 34 senses the first measured portion 32 or the first measurement area 331 The second signal transformation takes place away, and the worm 50 is at the same position. Then, the turning step is performed. After the worm 50 continues to rotate in the first direction by a first angle from the starting position, the worm 50 is at a turning position, and the worm 50 rotates from the turning position in the reverse direction (eg, counterclockwise) for a second time. Angle to reverse the rotation of the turntable 51, the main shaft 40 and the follower 31, it is worth noting that the second angle must be greater than the first angle so that the first detector 34 can sense the first measured portion 32 again Or the first measuring area 331, when the first detector 34 senses the approach of the first measured part 32 or the first measuring area 331 again and the third signal conversion occurs, the worm 50 is located at the re-measurement position, and the worm 50 The angle of rotation from the turning position to the re-measurement position is the re-measurement angle. Finally, the calculation step is performed, and the error angle is obtained by subtracting the re-measured angle from the first angle by a manual or computing device (such as a computer or computer), and the error angle can be further converted into a backlash value. In addition, when the index plate device of this embodiment wants to return to zero, the worm 50 is rotated to rotate the turntable 51, and the turntable 51 further drives the main shaft 40 and the follower 31 to rotate synchronously. When the second detector 35 senses When the second measurement area 332 of the second measured portion 33 is detected, the spindle 40 is at the zero return position.

In the above embodiment, the follower and the turntable are coaxially arranged on the main shaft, however, in other possible embodiments of the present invention, the follower can be integrally formed on the turntable or the main shaft, as long as the follower can be coaxial with the main shaft , This creation is not limited to this.

In the above embodiments, the three first measured parts and the one second measured part are evenly spaced from each other with the outer diameter surface at equal intervals. However, in other possible embodiments of this creation, the number of the first measured parts It can be adjusted to 1-7 according to actual needs. In addition, the first measured part and the second measured part may also be looped around the outer diameter surface at unequal intervals, as long as the rotation accuracy is not affected, this creation is not limited to this.

In the above embodiment, the length of the first measured part along the axial direction of the follower is smaller than that of the second measured part, and the second measured part further has a first measurement area and a second measurement area, however, other In a possible embodiment, the second measured part may not have the first measurement area but have the same axial length as the first measured part, as long as the first measured part and the second measured part are located on different sides of the follower The axial position enables the first detector to sense the first measured part, and the second detector to sense the second measured part. This creation is not limited to this.

In the above embodiment, the first and second tested portions protrude from the outer diameter surface, and the first and second tested portions are located at different axial positions of the follower, however, in In other possible embodiments of this creation, the first tested part and the second tested part may also be recessed in the outer diameter surface, or the first tested part and the second tested part are located at the same axial position and protrude outward The height of the radial surface is different, as long as the first and second measured parts can be sensed by the first and second detectors, respectively, this creation is not limited to this.

In the above-mentioned embodiment, in the preceding step, when the first detector senses that the first measured part or the first measurement area is far away and the second signal transformation occurs, the worm is located at the same position and is turning. During the step, when the first detector senses the proximity of the first measured part or the first measurement area again and the third signal transformation occurs, the worm is located at the re-measured position. However, in this creation, other possible embodiments In the middle, the identification points of the starting position and the re-measurement position can be changed, for example, in the previous step, the first signal is generated when the first detector senses the approach of the first measured part or the first measurement area During the conversion, the worm is at the same position, and during the turning step, the worm rotates in the reverse direction, so that when the first detector senses that the first measured part or the first measurement area is far away and the second signal conversion occurs , The worm is in the repeated measurement position, and similar measurement results can still be obtained.

In the above embodiment, during the turning step, the worm rotates a second angle from the turning position in the reverse direction, so that the first detector can sense the first measured part again, thereby obtaining the re-measured angle, however, in this creation In other possible embodiments, the worm may not be limited to the second angle, that is, the worm continues to rotate in the reverse direction from the turning position until the first detector senses the first measured portion again, and then stops as long as it can The first detector can sense the first measured part again to obtain the re-measured angle, and this creation is not limited to this.

In summary, the indexing plate device of the present invention drives the sensing device and the spindle to rotate through the transmission unit and senses the rotation (ie, the first detector senses the proximity of the first measured part or the first measurement area and Away), and record the rotation position (starting position and re-measurement position) of the worm by the signal conversion of the first detector, and then obtain the first angle and re-measurement angle, and then use the re-measurement angle to subtract from the first angle The error angle is obtained, and finally converted from the error angle to the backlash value. It is worth mentioning that the first detector senses when the follower is rotating, that is, when the current follower is being sensed, it can ensure that the follower is in the same background condition (rotating Sensed under the state), which can avoid the possibility of increasing errors due to changes in background conditions (from rotation to static, or from static to rotation) during sensing. Further, the dial device of this creation uses the first A detector measures the backlash when the follower rotates, and uses the second detector to zero, and the backlash value measured by the original dial device can be corrected and compensated through the program to increase the rotation accuracy. , No manual measurement is required, and there is no need to disassemble the dial device to adjust the worm or other parts. Therefore, the created dial device not only saves manpower and time, but also reduces the possibility of manual measurement and changes in background conditions. The error ensures the accuracy of the measurement. Furthermore, the dial device of this creation can measure the backlash at any time, and can measure the backlash for different rotation positions, so it can accurately grasp the size of the backlash at different rotation positions. However, the above embodiments are only for explaining and elaborating the technical content of this creation, and the patent scope of this patent shall be subject to the patent application scope described later.

10: Shell 20: plate body 30: Sensing device 31: Follower 311: outer diameter surface 32: The first test department 33: Second Test Department 331: first measurement area 332: Second measurement area 34: The first detector 35: Second detector 40: Spindle 50: Worm 51: Turntable 52: Power components

Figure 1 is a perspective view of the creation of the dial device. Figure 2 is a cross-sectional view of the creation indexing plate device. Figure 3 is a perspective view of the creative sensing device. Figure 4 is a top view of the creative sensing device. Figure 5 is a partial top view of the creation indexing plate device.

10: Shell

20: plate body

33: Second Test Department

34: The first detector

30: Sensing device

31: Follower

311: outer diameter surface

32: The first test department

35: Second detector

40: Spindle

50: Worm

51: Turntable

Claims (10)

A method for measuring backlash. This method is used to measure the backlash generated when a worm is engaged to drive a turntable to rotate forward and backward. The turntable and a follower are coaxially arranged on a main shaft, and the worm engagement drives the turntable to rotate. The turntable further drives the main shaft and the follower to rotate synchronously. The follower is provided with a first tested part. When the first tested part approaches or moves away from a first detector, the first detector Signal conversion will occur. The method includes the following steps: pre-step: rotate the worm in a first direction, so that the worm drives the turntable to rotate, and the turntable further drives the main shaft and the follower to rotate synchronously when the When the signal change of the first detector occurs, the worm is at the same position; the turning step: the worm continues to rotate from the starting position to the first direction by a first angle. At this time, the worm is at a turning position, and then the worm Reverse rotation from the turning position to reverse rotation of the turntable, the main shaft and the follower, when the first detector again undergoes signal conversion, the worm is in a re-measured position, the worm from the turning position to The angle rotated by the re-measurement position is a re-measurement angle; the calculation step: subtracting the re-measurement angle and the first angle to obtain an error angle, which can be further converted into a backlash value. The method for measuring backlash as described in item 1 of the patent application scope, wherein, in the pre-step, when the first detector senses that the first measured part is far away and a signal transformation occurs, the worm It is located at the starting position, and at the turning step, when the first detector senses the approach of the first tested portion again and a signal transformation occurs, the worm is located at the re-measured position. The method for measuring backlash as described in item 1 of the patent application scope, wherein, in the turning step, the worm rotates in a reverse direction from the turning position by a second angle, the second angle is greater than the first angle, so that the The first detector can sense the first tested part again. A sensing device is used to detect the backlash generated when a worm meshing drives a turntable to rotate forward and backward. The turntable is coaxially arranged on a main shaft. The worm meshing drives the turntable to rotate. The turntable further drives the main shaft to rotate synchronously. , The sensing device includes: a follower, which is provided coaxially on the main shaft and rotates synchronously with the main shaft, the follower has an outer diameter surface and a plurality of first tested parts, the The first tested part is spaced on the outer diameter surface of the follower; a first detector is located around the outer diameter surface of the follower and faces the outer diameter surface, when When the follower rotates with the main shaft, the first detector senses that the first measured parts approach or move away. The sensing device as described in item 4 of the patent application scope, wherein the follower further has a second tested part, and the first tested part and the second tested part are arranged on the slave at equal intervals The outer diameter surface of the moving member, the sensing device further includes a second detector located around the outer diameter surface of the follower and facing the outer diameter surface, the second detection The sensor senses the second tested part. The sensing device according to item 5 of the patent application scope, wherein the first detector and the second detector face different axial positions of the follower, and the first measured portion and the first The two tested parts are located at different axial positions of the follower. The sensing device as described in item 5 of the patent application range, wherein the first tested portion and the second tested portion protrude from the outer diameter surface of the follower. The sensing device as described in item 5 of the patent application scope, wherein the length of the first tested portion along the axial direction of the follower is different from that of the second tested portion, and the second tested portion further has a the first A measurement area and a second measurement area, the first measurement area is sensed by the first detector, and the second measurement area is sensed by the second detector. The sensing device as described in item 8 of the patent application scope, wherein the length of the first tested portion along the axial direction of the follower is smaller than that of the second tested portion, and the first measurement area and the first subject The measuring part is located at the same axial position of the follower, and the second measuring zone and the first measured part are located at different axial positions of the follower. An index plate device, including the sensing device as described in any one of patent application items 4 to 9, further comprising: a main shaft, a follower of the sensing device is coaxially arranged on the main shaft and follows the The spindle rotates synchronously; a transmission unit drives the spindle to rotate. The transmission unit has a worm, a turntable, and a power component. The worm rotatably engages the turntable. The sensing device is used to detect the worm engagement Backlash generated when the turntable rotates forward and backward, the turntable is coaxially arranged on the main shaft, the power assembly drives the worm to rotate; a housing, the housing can accommodate the sensing device, the main shaft and the transmission unit; A disc body is located on one side of the housing, and the disc body is coaxially disposed on the main shaft.

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