Angle measuring tool

Abstract

The utility model discloses an angle measuring tool, and relates to a dental bending machine testing device. Comprising a test bench, the test bench is provided with a detection assembly, the detection assembly comprises a transmission part and a measurement part, the top of the transmission part is provided with a placement hole for insertion of a driving shaft of a bending machine motor, the driving shaft is inserted into the placement hole, and the bending machine motor drives the transmission part to swing back and forth when started; the measuring part is arranged at the bottom of the transmission part and is connected with the transmission part, and when the transmission part swings back and forth, the measuring part swings back and forth synchronously under the driving of the transmission part. The device has the advantage of being more convenient to use.

Description

TECHNICAL FIELD

[0001] The utility model relates to dental bending machine testing device especially angle measurement frock. BACKGROUND

[0002] Dental bending machine is a kind of instrument commonly used in dental operation, and bending machine motor is one of the core components of dental bending machine, and its durability and precision degree directly influence the performance of bending machine. Therefore, bending machine motor often needs to be tested when it is shipped. Therefore, a test device capable of testing the swing angle and speed of bending machine motor is required. UTILITY MODEL CONTENTS

[0003] In order to overcome the shortcomings of the prior art, the utility model provides an angle measurement frock.

[0004] The utility model adopts the following technical scheme:

[0005] The application discloses an angle measurement frock, which comprises a test table, a detection assembly is arranged on the test table, the detection assembly comprises a transmission part and a measuring part, a placing hole for inserting a drive shaft of a bending machine motor is arranged at the top of the transmission part, the drive shaft is inserted into the placing hole, and the transmission part is driven to reciprocate when the bending machine motor starts;

[0006] The measuring part is arranged at the bottom of the transmission part and is connected with the transmission part, and the measuring part is synchronously reciprocated under the drive of the transmission part when the transmission part reciprocates.

[0007] The transmission part comprises a first coupling, the first coupling is rotatably connected to the test table through a rotating shaft, one end of the rotating shaft is fixedly connected with one end of the first coupling, and the other end of the rotating shaft is rotatably connected to the test table.

[0008] The placing hole is arranged at the other end of the first coupling, the rotating shaft is perpendicular to the end face of the test table, and the measuring part is arranged between the first coupling and the test table and is coaxially arranged with the first coupling.

[0009] The measuring part comprises a test disc and a pointer, the pointer is sleeved on the rotating shaft and is coaxial with the first coupling, the test disc is sleeved on the rotating shaft and is arranged below the pointer and is fixed on the test table, and the pointer is synchronously reciprocated when the first coupling is driven to swing back by the bending machine motor.

[0010] The test disc is uniformly provided with scales in the circumferential direction, and the measuring part further comprises a high-speed camera, the lens of the high-speed camera faces the pointer and is used for shooting the reciprocating swing amplitude of the pointer.

[0011] The test bench is also provided with a support assembly arranged on one side of the detection assembly, the support assembly comprising a translation adjusting part and a height adjusting part, the translation adjusting part being fixed on the test bench and arranged along the width direction of the test bench;

[0012] The height adjusting part is arranged on the translation adjusting part and is driven by the translation adjusting part to move back and forth along the width direction of the test bench, and the height adjusting part is perpendicular to the end face of the test bench;

[0013] The measuring part is arranged on the test bench, the input end of the measuring part is connected with the transmission part, the transmission part is perpendicular to the end face of the test bench and parallel to the height adjusting part, the bender motor is arranged on the height adjusting part and is driven by the height adjusting part to move close to or away from the test bench, and when the bender motor moves close to the test bench, the driving shaft is inserted into the placement hole of the transmission part.

[0014] The translation adjusting part comprises a translation adjusting seat, the translation adjusting seat is fixed on the test bench and arranged along the length direction of the test bench, a translation screw is arranged on the translation adjusting seat, the translation screw is rotationally connected to the translation adjusting seat, a translation sliding block is sleeved on the translation screw, and when the translation screw rotates, the translation sliding block moves back and forth along the width direction of the test bench, and the height adjusting part is fixed on the translation sliding block and is driven by the translation sliding block to move back and forth;

[0015] Alternatively, a translation sliding rail is arranged on the translation adjusting seat and arranged along the width direction of the test bench, a translation sliding block slides on the translation sliding rail, the height adjusting part is fixed on the translation sliding block, and a locking piece is arranged between the translation sliding block and the translation sliding rail to lock the translation sliding block.

[0016] The height adjusting part comprises a height adjusting seat arranged on the translation sliding block, a height screw is arranged on the height adjusting seat, the height screw is rotationally connected to the height adjusting seat, a height sliding block is sleeved on the height screw, and when the height screw rotates, the height sliding block moves close to or away from the test bench along a direction perpendicular to the test bench, a clamp is arranged on the height sliding block to clamp the bender motor, and when the height sliding block moves close to the test bench, the clamp clamps the bender motor and drives the driving shaft of the bender motor to be inserted into the placement hole;

[0017] Alternatively, a height sliding rail is arranged on the height adjusting seat and is perpendicular to the end face of the test bench, a height sliding block slides on the height sliding rail, one end of the height sliding rail is fixed on the translation sliding block, the height sliding rail is perpendicular to the end face of the test bench, and a locking piece is arranged between the height sliding block and the height sliding rail to lock the translation sliding block.

[0018] The transmission part comprises a pair of second shaft couplings, the pair of second shaft couplings are connected through a universal joint, the universal joint top end second shaft coupling is provided with the placing hole, and the universal joint bottom end second shaft coupling is connected with the measuring part to drive the measuring part to rotate.

[0019] The measuring part comprises an angle sensor and a damper, the angle sensor is arranged at the input end of the damper, and the second shaft coupling is coaxially connected with the input end of the damper to drive the damper to act;

[0020] The test bench is provided with a signal processing device, the angle sensor is signal connected with the signal processing device, the signal processing device comprises a processor and a display, and the angle sensor and the display are signal connected with the processor respectively.

[0021] Compared with the prior art, the bending machine motor is coaxially connected with the shaft coupling, specifically, the bending machine motor is inserted into the placing hole formed in the shaft coupling, the hole is coaxial with the shaft coupling, and when the bending machine motor is swung back, the lower end of the shaft coupling can be directly connected with the detection part, so that the swing back of the driving shaft of the bending machine motor is converted into synchronous swing back of the shaft coupling. The shaft coupling is connected with the detection part, so that the swing angle and speed of the bending machine motor can be detected by using the detection part. In one embodiment, the damper is used to simulate the actual use condition (i.e. the load condition) of the dental handpiece, the damping is adjustable, the no-load condition of the bending machine motor can be simulated, and the load condition of the bending machine motor can also be simulated, so that the detection data is more real and accurate. The reciprocating angle and reciprocating speed of the bending machine motor are measured by the sensor, the detection speed function is increased, the number of equipment is reduced, multiple functions are combined together, and the use is more convenient. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a first embodiment structure schematic view of the angle measurement tool in the utility model;

[0023] Figure 2 is a second embodiment structure schematic view of the angle measurement tool in the utility model;

[0024] Figure 3 is a detection assembly structure schematic view of the second embodiment of the angle measurement tool in the utility model;

[0025] Figure 4 is a clamp structure schematic view of the second embodiment of the angle measurement tool in the utility model;

[0026] In the figure: 1, test bench; 2, detection assembly; 21, transmission part; 211, first coupling; 212, second coupling; 22, measurement part; 221, test disc; 222, pointer; 223, universal joint; 224, damper; 225, angle sensor; 23, placement hole; 3, support assembly; 31, translation adjustment part; 311, translation adjustment seat; 312, translation slide rail; 313, translation slide block; 32, height adjustment part; 321, height adjustment seat; 322, height slide rail; 323, height slide block; 33, clamp; 331, clamping seat; 332, fixed clamping plate; 333, base; 334, locking bolt; 335, rotating bolt; 336, rotating block; 4, signal processing device; 41, display. DETAILED DESCRIPTION

[0027] In the following, the utility model will be further described in combination with the drawings and specific embodiments, and it should be noted that the following described embodiments or technical features can be combined to form new embodiments without conflict.

[0028] Referring to Figures 1-4 An angle measurement tool, comprising a test bench 1, the test bench 1 is provided with a detection assembly 2, the detection assembly 2 comprises a transmission part 21 and a measurement part 22, the top of the transmission part 21 is provided with a placement hole 23 for inserting the drive shaft of a bender motor, the drive shaft is inserted into the placement hole 23, and the bender motor drives the transmission part 21 to reciprocate when it is started. The measurement part 22 is arranged at the bottom of the transmission part 21 and is connected with the transmission part 21, and the measurement part 22 reciprocates synchronously under the drive of the transmission part 21 when the transmission part 21 reciprocates. In use, the bender motor is connected with the transmission part 21. The reciprocating movement of the bender motor is enlarged, and the measurement part 22 is driven to measure by the reciprocating movement of the transmission part 21, so as to realize the test of the bender motor.

[0029] Referring to Figure 1 It is one of the implementation manners of the angle measurement tool, and in the implementation manner, the transmission part 21 comprises a first coupling 211, the first coupling 211 is rotationally connected to the test bench 1 through a rotating shaft, one end of the rotating shaft is fixedly connected with one end of the first coupling 211, and the other end of the rotating shaft is rotationally connected to the test bench 1. In the embodiment, the placement hole 23 is arranged at the other end of the first coupling 211, the rotating shaft is perpendicular to the end surface of the test bench 1, and the measurement part 22 is arranged between the first coupling 211 and the test bench 1 and coaxially arranged with the first coupling 211.

[0030] In the embodiment, the measuring unit 22 comprises a test disc 221 and a pointer 222, the pointer 222 is sleeved on the rotating shaft and coaxial with the first coupling 211, the test disc 221 is sleeved on the rotating shaft and placed below the pointer 222 and fixed on the test bench 1, and the first coupling 211 is driven by the bending machine motor to swing and synchronously swing the pointer 222. The test disc 221 is uniformly provided with scales in the circumferential direction, and the measuring unit 22 further comprises a high-speed camera, the lens of the high-speed camera faces the pointer 222 and is used for shooting the swing amplitude of the pointer 222. In use, the swing of the bending machine motor is converted into the swing of the pointer 222, the test disc 221 is below the pointer 222, so that the test angle of the pointer 222 when swinging can be obtained, and since the pointer 222 swings at a high level during detection, in order to determine the swing angle of the bending machine motor, the high-speed camera is used to shoot the pointer 222 at intervals, so as to freeze the frame and facilitate the test personnel to observe the swing angle of the bending machine motor.

[0031] When the angle measuring tool in the embodiment is used for measurement, the following measurement method is adopted, which comprises the following steps:

[0032] Before testing, the bending machine motor is held, the driving shaft of the bending machine motor is inserted into the placement hole 23, and it is ensured that the insertion is in place; the bending machine motor is started, the start button of the motor is jogged, and the bending machine motor is in a jog state, so as to test the connection reliability of the bending machine motor and the first coupling 211;

[0033] The detection step comprises the following steps:

[0034] The starting step comprises the following steps:

[0035] The recording and observing step comprises the following steps:

[0036] In use, the swing of the bending machine motor is converted into the swing of the pointer 222, the test disc 221 is below the pointer 222, so that the test angle of the pointer 222 when swinging can be obtained, and since the pointer 222 swings at a high level during detection, in order to determine the swing angle of the bending machine motor, the high-speed camera is used to shoot the pointer 222 at intervals, so as to freeze the frame and facilitate the test personnel to observe the swing angle of the bending machine motor.

[0037] Reference Figures 2-4Another embodiment is also disclosed in the present application. Since the photographing of high-speed camera and manual observation are required in the previous embodiment, the error is large. In order to reduce the error, the support assembly 3 is further arranged on the test table 1 in the present embodiment. The support assembly 3 is arranged on one side of the detection assembly 2. The support assembly 3 comprises the translation adjusting part 31 and the height adjusting part 32. The translation adjusting part 31 is fixed on the test table 1 and arranged along the width direction of the test table 1.

[0038] The height adjusting part 32 is arranged on the translation adjusting part 31 and driven by the translation adjusting part 31 to reciprocate along the width direction of the test table 1. The height adjusting part 32 is perpendicular to the end surface of the test table 1. The measurement part 22 is arranged on the test table 1. The input end of the measurement part 22 is connected with the transmission part 21. The transmission part 21 is perpendicular to the end surface of the test table 1 and parallel to the height adjusting part 32. The bender motor is arranged on the height adjusting part 32 and driven by the height adjusting part 32 to approach or move away from the test table 1. When the bender motor approaches the test table 1, the driving shaft is inserted into the placement hole 23 of the transmission part 21. The measurement part 22 no longer needs to be held by the tester for testing, but is placed on the height adjusting part 32.

[0039] Specifically, the height adjusting part 32 comprises the height adjusting seat 321. The height adjusting seat 321 is arranged on the translation sliding block 313. The height adjusting seat 321 is provided with the height lead screw. The height lead screw is rotationally connected with the height adjusting seat 321. The height lead screw is sleeved with the height sliding block 323. When the height lead screw rotates, the height sliding block 323 approaches or moves away from the test table 1 along the direction perpendicular to the test table 1. The height sliding block 323 is provided with the clamp 33 for clamping the bender motor. When the height sliding block 323 approaches the test table 1, the clamp 33 clamps the bender motor and drives the driving shaft of the bender motor to be inserted into the placement hole 23. The clamp 33 is used for clamping during testing. The bender is more stable during the whole testing process, and has less influence on the testing result. The translation adjusting part 31 comprises the translation adjusting seat 311. The translation adjusting seat 311 is fixed on the test table 1 and arranged along the length direction of the test table 1. The translation adjusting seat 311 is provided with the translation lead screw. The translation lead screw is rotationally connected with the translation adjusting seat 311. The translation lead screw is sleeved with the translation sliding block 313. When the translation lead screw rotates, the translation sliding block 313 reciprocates along the width direction of the test table 1. The height adjusting part 32 is fixed on the translation sliding block 313 and driven by the translation sliding block 313 to reciprocate.

[0040] In the embodiment, the height slider 323 and the translation slider 313 can also move using the slide rails, that is, the height slider 323 corresponds to using the height slide rail 322, and the translation slider 313 corresponds to using the translation slide rail 312. The height slide rail 322 is used to replace the height lead screw, and the translation slide rail 312 is used to replace the translation lead screw. The translation slide rail 312 is fixed on the translation adjusting seat 311 and is also arranged along the width direction of the test table 1. The height slide rail 322 is also fixed on the translation slider 313 and is perpendicular to the test table 1. The translation slider 313 is clamped on the translation slide rail 312 and slides on the translation slide rail 312. The height slider 323 is clamped on the height slide rail 322 and can slide on the height slide rail 322. The height slider 323 and the translation slider 313 are both provided with a positioning bolt. Taking the translation slider 313 as an example, a bolt hole is formed in the side wall of the translation slider 313, and the positioning bolt is inserted into the bolt hole and directly contacts the side wall of the translation slide rail 312. The height slider 323 and the translation slider 313 are locked and positioned by using the same positioning bolt and bolt hole. When locking is needed, the corresponding locking bolt can be tightened to abut against the corresponding slide rail to achieve the locking function.

[0041] In the embodiment, the clamp 33 can be a common clamp 33, that is, it includes a clamping seat 331, and a fixed clamping plate 332 is arranged at both ends of the clamping seat 331. The pair of fixed clamping plates 332 are parallel to each other and perpendicular to the clamping seat 331. A locking bolt 334 is arranged on one of the fixed clamping plates 332. When clamping is needed, the dental bending machine is placed between the pair of fixed plates, and the locking bolt 334 is rotated to move towards the bending machine and finally abut against the shell of the bending machine to form clamping of the bending machine.

[0042] Further, the clamping seat 331 and the height slider 323 have a base 333 for fixing the clamping seat 331. Specifically, the base 333 is rotationally connected between the height slider 323 and the base 333. The base 333 is rotationally connected between the height slider. The specific scheme of the rotational connection is that the base 333 and the height slider 323 can be connected by a rotating bolt 335 to enable the base 333 to rotate around the rotating bolt 335, and after rotating to the corresponding position, the rotating bolt 335 is tightened to fix the relative position between the base 333 and the height slider 323, so that the base 333 cannot rotate. The clamping seat 331 can be inserted on the base 333 through a connecting shaft and can rotate to adjust the position and angle of the bending machine motor of different sizes and models, so that the driving shaft of the bending machine motor can always align with the placement hole 23 on the measuring part 22.

[0043] The limiting piece arranged on the height sliding block 323 can abut against the clamping seat 331 to limit the rotation of the clamping seat 331 after the clamping seat 331 is rotated to the position. The limiting piece comprises a rotating block 336 connected with the clamping seat 331 through a rotating shaft, the edge of the rotating block 336 is fixed with a pushing piece, a torsion spring is sleeved on the rotating shaft, and the torsion spring is energized when the rotating shaft rotates. At least one fixing groove is formed in the outer edge of the rotating block 336, the fixing groove is rotated away from the clamping seat 331 when the pushing piece is pushed, and the rotation of the clamping seat 331 is not interfered. When the clamping seat 331 is rotated to the position and the pushing piece is released, the edge of the clamping seat 331 abuts against the fixing groove to form the limiting effect on the clamping seat 331. The clamping seat 331 can be inserted on the base 333 through a connecting shaft and can be rotated to facilitate the position and angle adjustment of the bender motor of different sizes to make the driving shaft of the bender motor always align with the placement hole 23 on the measuring part 22. The use range is wider.

[0044] In the embodiment, the transmission part 21 comprises a pair of second shafts 212 connected through the universal joint 223, the placement hole 23 is formed in the second shaft 212 at the top end of the universal joint 223, and the second shaft 212 at the bottom of the universal joint 223 is connected with the measuring part 22 to drive the measuring part 22 to rotate. The measuring part 22 comprises the angle sensor 225 and the damper 224, the angle sensor 225 is arranged at the input end of the damper 224, and the second shaft 212 is coaxially connected with the input end of the damper 224 to drive the damper 224 to act. The signal processing device 4 is arranged on the test bench 1, the angle sensor 225 is signal connected with the signal processing device 4, the signal processing device 4 comprises a processor and a display 41, and the angle sensor 225 and the display 41 are signal connected with the processor respectively.

[0045] In the embodiment, the damper 224 is used to simulate the real use condition (i.e. the load condition) of the dental handpiece, the damping is adjustable, the no-load condition of the bender motor can be simulated, the load condition of the bender motor can be simulated, and the detection data is more real and accurate. The reciprocating angle and reciprocating speed of the bender motor are measured through the sensor, the detection single speed function is increased, the number of equipment is reduced, multiple functions are combined together, and the use is more convenient.

[0046] The following steps are adopted to realize the measurement of the bender motor by using the measuring tool in the embodiment:

[0047] The preparation step is that the bending machine motor is clamped by the clamp 33, the translational screw and the height screw are adjusted to clamp the position of the clamp 33, until the driving shaft of the bending machine motor is inserted into the placement hole 23; or the translational slider 313 and the height slider 323 are directly pushed to adjust the position of the bending machine motor, after the adjustment, the clamping seat 331 can be unlocked by pushing the toggle, and finally the clamping seat 331 is rotated for fine adjustment, the driving shaft of the bending machine motor can be always aligned with the placement hole 23, then the position of the height slider 323 is adjusted again, so that the driving shaft of the bending machine motor can be stably inserted into the placement hole 23.

[0048] The detection step is that the bending machine motor is started, the driving shaft of the bending machine motor drives the second coupling 212 to reciprocate, and enters the test stage. The result display step is that the reciprocating angle of the bending machine motor is measured by the angle sensor 225 and transmitted to the controller, the reciprocating angle of the bending machine motor and the linear speed of the reciprocating of the bending machine motor are calculated by the controller and displayed on the display 41.

[0049] In the embodiment, the damper 224 is used to simulate the actual use condition (namely the load condition) of the dental handpiece, the damping is adjustable, the no-load condition of the bending machine motor can be simulated, and the load condition of the bending machine motor can also be simulated, so that the detection data is more real and accurate. The reciprocating angle and the reciprocating speed of the bending machine motor are measured by the sensor, the detection single speed function is increased, the number of devices can be reduced, multiple functions are combined together, and the use is more convenient.

[0050] The above embodiment is only a preferred embodiment of the utility model, and cannot be used to limit the range of the utility model protection, any non-substantial change and replacement made by the person skilled in the art on the basis of the utility model belongs to the range of the utility model protection.

Claims

1. An angle measuring fixture, comprising a test stand, characterized in that: The test bench is equipped with a detection component, which includes a transmission part and a measuring part. The top of the transmission part is provided with a placement hole for inserting the drive shaft of the bending machine motor. The drive shaft is inserted into the placement hole. When the bending machine motor is started, it drives the transmission part to swing back and forth. The measuring part is located at the bottom of the transmission part and is connected to the transmission part. When the transmission part swings back and forth, the measuring part swings back and forth synchronously under the drive of the transmission part.

2. The angle measuring fixture according to claim 1, characterized in that: The transmission unit includes a first coupling, which is rotatably connected to the test bench via a rotating shaft. One end of the rotating shaft is fixedly connected to one end of the first coupling, and the other end of the rotating shaft is rotatably connected to the test bench. The placement hole is opened at the other end of the first coupling, the rotating shaft is perpendicular to the end face of the test bench, and the measuring part is located between the first coupling and the test bench and is coaxially arranged with the first coupling.

3. The angle measuring fixture according to claim 2, characterized in that: The measuring unit includes a test disc and a pointer. The pointer is sleeved on the rotating shaft and coaxial with the first coupling. The test disc is sleeved on the rotating shaft, positioned below the pointer, and fixed on the test table. When the first coupling is driven to swing back and forth by the bending machine motor, the pointer swings back and forth synchronously. The test disc is uniformly marked with graduations along the circumference. The measuring unit also includes a high-speed camera, the lens of which is directed toward the pointer to capture the reciprocating swing amplitude of the pointer.

4. The angle measuring fixture according to claim 1, characterized in that: The test bench is also provided with a support component, which is located on one side of the detection component. The support component includes a translation adjustment part and a height adjustment part. The translation adjustment part is fixed on the test bench and arranged along the width direction of the test bench. The height adjustment part is mounted on the translation adjustment part and is driven by the translation adjustment part to move back and forth along the width direction of the test platform. The height adjustment part is perpendicular to the end face of the test platform. The measuring unit is mounted on the test bench. The input end of the measuring unit is connected to the transmission unit. The transmission unit is perpendicular to the end face of the test bench and parallel to the height adjustment unit. The bending machine motor is mounted on the height adjustment unit and is driven by the height adjustment unit to move closer to or away from the test bench. When the bending machine motor moves closer to the test bench, the drive shaft is inserted into the placement hole of the transmission unit.

5. The angle measuring fixture according to claim 4, characterized in that: The translation adjustment unit includes a translation adjustment seat, which is fixed on the test platform and arranged along the length of the test platform. A translation screw is provided on the translation adjustment seat, which is rotatably connected to the translation adjustment seat. A translation slider is sleeved on the translation screw. When the translation screw rotates, the translation slider moves back and forth along the width of the test platform. The height adjustment unit is fixed on the translation slider and moves back and forth driven by the translation slider. Alternatively, the translation adjustment seat is provided with a translation slide rail, which is arranged along the width direction of the test platform. The translation slider slides on the translation slide rail, the height adjustment part is fixed on the translation slider, and a locking member is provided between the translation slider and the translation slide rail for locking the translation slider.

6. The angle measuring fixture according to claim 5, characterized in that: The height adjustment unit includes a height adjustment seat, which is disposed on the translation slider. The height adjustment seat is provided with a height screw, which is rotatably connected to the height adjustment seat. A height slider is sleeved on the height screw. When the height screw rotates, the height slider moves closer to or away from the test platform in a direction perpendicular to the test platform. The height slider is provided with a clamp for clamping the bending machine motor. When the height slider moves closer to the test platform, the clamp clamps the bending machine motor and drives the drive shaft of the bending machine motor to insert into the placement hole. Alternatively, the height adjustment seat is provided with a height slide rail, the height slide rail is perpendicular to the end face of the test platform, the height slider slides on the height slide rail, one end of the height slide rail is fixed to the translation slider, the height slide rail is perpendicular to the end face of the test platform, and a locking component is provided between the height slider and the height slide rail to lock the translation slider.

7. The angle measuring fixture according to claim 4, characterized in that: The transmission unit includes a pair of second couplings connected by a universal joint. The second coupling at the top of the universal joint has the placement hole, and the second coupling at the bottom of the universal joint is connected to the measuring unit to drive the measuring unit to rotate.

8. The angle measuring fixture according to claim 7, characterized in that: The measuring unit includes an angle sensor and a damper. The angle sensor is located at the input end of the damper. The second coupling is coaxially connected to the input end of the damper to drive the damper to move. The test bench is equipped with a signal processing device. The angle sensor is signal-connected to the signal processing device. The signal processing device includes a processor and a display. The angle sensor and the display are respectively signal-connected to the processor.

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