阅读说明：本技术 一种高精度大量程的力矩测量装置 (High-precision wide-range torque measuring device ) 是由 郭迪明 王刚 何鹏 于 2019-10-27 设计创作，主要内容包括：本发明公开了一种高精度大量程的力矩测量装置,涉及力矩测量技术领域,解决了现有的力矩测量量程小,对力矩传感器损害大,造成测量精度低,误差大等问题,包括底部支撑架,底部支撑架的上端面安装有旋转支撑机构,旋转支撑机构包括端部支撑架、轴承包、转向电机、连接轴、旋转连接架、支撑框架、加强筋支架和支撑轴,支撑框架的内侧安装有两个加强筋支架,支撑框架的两端均安装有旋转连接架,旋转连接架的一侧安装有轴承包。本发明通过对被测件进行进行力矩测量,测量量程大、精度高,能够对力矩传感器起到保护作用,且可对竖向和横向两种状态进行测量。(The invention discloses a high-precision wide-range torque measuring device, which relates to the technical field of torque measurement and solves the problems of low measurement precision, large error and the like caused by small measurement range and large damage to a torque sensor of the existing torque measurement. The invention carries out torque measurement on the measured piece, has large measurement range and high precision, can protect the torque sensor, and can carry out measurement on the vertical state and the horizontal state.)

1. The utility model provides a moment measuring device of high accuracy wide-range, includes bottom sprag frame (1), its characterized in that: the upper end face of the bottom support frame (1) is provided with a rotary support mechanism (4), the rotary support mechanism (4) comprises an end support frame (401), a bearing pack (402), a steering motor (403), a connecting shaft (404), a rotary connecting frame (405), a support frame (406), a reinforcing rib support (407) and a support shaft (408), two reinforcing rib supports (407) are arranged on the inner side of the support frame (406), the rotary connecting frame (405) is arranged at two ends of the support frame (406), a bearing (402) is arranged on one side of the rotary connecting frame (405), the end support frame (401) is arranged on the lower end face of the bearing (402), one of the end support frames (401) is provided with a transverse support positioning mechanism (2), and the inner side of one of the bearing (402) is provided with the connecting shaft (404), one end of the connecting shaft (404) is provided with a steering motor (403), the inner side of the other bearing (402) is provided with a supporting shaft (408), and the lower end surface of the supporting frame (406) is provided with a speed reducer (7);

A servo motor (6) is arranged on the lower end surface of the speed reducer (7), a bottom adjusting positioning plate (3) is arranged on one side of the bottom end of the servo motor (6), a rigid coupling (8) is arranged on the upper end surface of the supporting frame (406), a limiting guide mechanism (5) is arranged on the outer side of the rigid coupling (8), the upper end surface of the rigid coupling (8) is provided with a moment detection mechanism (9), the moment detection mechanism (9) comprises a protective shell (901), a placing block (902) and a moment sensor (903), two placing blocks (902) are arranged on the outer side of the torque sensor (903), a protective shell (901) is arranged on the outer side of each placing block (902), a diaphragm type elastic coupling (10) is arranged on the upper end face of one of the protective shells (901), and a shifting fork (11) is arranged above the diaphragm type elastic coupling (10).

2. A high accuracy wide range torque measuring device as defined in claim 1, wherein: the transverse supporting and positioning mechanism (2) comprises a sliding plate (201), vertical fixing columns (202), a transverse connecting plate (203), an adjusting screw rod (204), a motor positioning plate (205), fixed supporting plates (206), a measuring part limiting plate (207), a buffer plate (208), supporting springs (209) and guide rods (210), the sliding plate (201) is installed at two ends of the transverse connecting plate (203), the vertical fixing columns (202) are installed on the upper end face of the sliding plate (201), the motor positioning plate (205) is installed on the inner side of one end of one vertical fixing column (202), the adjusting screw rod (204) is installed on the inner side of one end of the motor positioning plate (205), the fixed supporting plate (206) is installed on one side of the vertical fixing column (202), the four supporting springs (209) are installed on the upper end face of the fixed supporting plate (206), and the guide rods (210) are installed on the, buffer plate (208) are installed to the up end of supporting spring (209), two measurement limiting plate (207) are installed to the up end of buffer plate (208).

3. A high accuracy wide range torque measuring device as defined in claim 1, wherein: spacing guiding mechanism (5) are including spacing post (501), adapter sleeve pole (502), top support frame (503) and spacing arc board (504), spacing post (501) are installed at four end angles of terminal surface under top support frame (503), adapter sleeve pole (502) are installed in the outside of spacing post (501), spacing arc board (504) are installed to the one end of adapter sleeve pole (502).

4. A high accuracy wide range torque measuring device as defined in claim 1, wherein: the upper end face of the end supporting frame (401) is provided with a limiting groove, the lower end face of the bearing (402) is connected and fixed on the inner side of the limiting groove through a screw, a bearing is arranged on the inner side of the bearing (402), and the connecting shaft (404) and the supporting shaft (408) are connected and fixed on the inner side of the bearing (402) through the bearing.

5. A high accuracy wide range torque measuring device as defined in claim 1, wherein: the one end of connecting axle (404) all is fixed with swivelling joint frame (405) through the screw connection with the one end of back shaft (408), one side of swivelling joint frame (405) is provided with the connector, swivelling joint frame (405) pass through connector welded fastening at the both ends of braced frame (406), strengthening rib support (407) pass through the inboard of screw connection fixing at braced frame (406).

6. A high accuracy wide range torque measuring device as defined in claim 1, wherein: moment detection mechanism (9) are connected through rigid coupling (8) with speed reducer (7), the inboard of protective housing (901) one end is provided with the connecting rod, and the one end of connecting rod extends to the inboard of placing piece (902) one end, the inboard of placing piece (902) is provided with the mounting groove, moment sensor (903) set up the inboard at the mounting groove.

7. A high accuracy wide range torque measuring device as defined in claim 1, wherein: the protective shell (901) is connected with a shifting fork (11) through a diaphragm type elastic coupling (10), the shifting fork (11) is fixed on the outer side of the upper end of the diaphragm type elastic coupling (10) through screw connection, and a positioning head is arranged on the upper end face of the shifting fork (11).

8. A high accuracy wide range torque measuring device as defined in claim 2, wherein: the upper end face of the sliding plate (201) is provided with a sliding groove, the lower ends of the vertical fixing columns (202) extend to the inner side of the sliding groove, a groove is formed in the inner side of the upper end of one of the vertical fixing columns (202), one end of the motor positioning plate (205) extends to the inner side of the groove, a threaded hole is formed in the inner side of one end of the motor positioning plate (205), and one end, penetrating through the motor positioning plate (205), of the lower end of the adjusting screw rod (204) is fixed to the inner side of the upper end of the vertical fixing column (202).

9. A high accuracy wide range torque measuring device as defined in claim 2, wherein: one end of the fixed supporting plate (206) is welded and fixed on one side of one of the vertical fixing columns (202), the fixed supporting plate (206) is connected with the buffer plate (208) through four supporting springs (209), a waist-shaped hole is formed in the upper end face of the buffer plate (208), and the measuring part limiting plate (207) is fixed on the upper end face of the buffer plate (208) through bolt connection.

10. A high accuracy wide range torque measuring device as defined in claim 3, wherein: the top support frame (503) is fixed at the upper end face of spacing post (501) through screwed connection, the one end of connecting loop bar 502 is fixed in the outside of spacing post (501) through threaded connection, the other end welded fastening of connecting loop bar 502 has spacing arc board (504), one side of spacing arc board (504) is provided with the arc wall.

Technical Field

The invention relates to the technical field of torque measurement, in particular to a high-precision wide-range torque measurement device.

Background

With the rapid development of social economy, people have stricter and stricter quality detection on products in the production process, wherein the quality of the products is convenient to ensure by detecting and measuring the moment borne by the products, the moment refers to the tendency of acting force to enable an object to rotate around a rotating shaft or a fulcrum in physics, and originates from the research on levers by Archimedes, and the rotating moment is also called torque or torque.

However, the existing torque measurement range is small, the damage to a torque sensor is large, the measurement accuracy is low, and the error is large; therefore, the existing requirement is not met, and a high-precision large-range torque measuring device is provided for the moment measuring device.

Disclosure of Invention

The invention aims to provide a high-precision wide-range torque measuring device, which aims to solve the problems of low measuring precision, large error and the like caused by small torque measuring range, large damage to a torque sensor and the like in the prior art.

In order to achieve the purpose, the invention provides the following technical scheme: a high-precision wide-range torque measuring device comprises a bottom support frame, wherein a rotary support mechanism is arranged on the upper end surface of the bottom support frame, the rotary supporting mechanism comprises an end supporting frame, a bearing, a steering motor, a connecting shaft, a rotary connecting frame, a supporting frame, a reinforcing rib support and a supporting shaft, two reinforcing rib brackets are arranged on the inner side of the supporting frame, rotary connecting frames are arranged at both ends of the supporting frame, one side of the rotary connecting frame is provided with a bearing, the lower end surface of the bearing is provided with an end part supporting frame, one side of one of the end supporting frames is provided with a transverse supporting and positioning mechanism, the inner side of one of the bearing pockets is provided with a connecting shaft, and a steering motor is installed at one end of the connecting shaft, a supporting shaft is installed on the inner side of the other bearing contract, and a speed reducer is installed on the lower end surface of the supporting frame.

Servo motor is installed to the lower terminal surface of speed reducer, the bottom is installed and is adjusted the locating plate in one side of servo motor bottom, rigid coupling is installed to braced frame's up end, spacing guiding mechanism is installed in rigid coupling's the outside, moment detection mechanism is installed to rigid coupling's up end, moment detection mechanism includes protective housing, places piece and torque sensor, two are installed in torque sensor's the outside and are placed the piece, place the outside of piece and install protective housing, one of them diaphragm formula elastic coupling is installed to protective housing's up end, the shift fork is installed to diaphragm formula elastic coupling's top.

Preferably, the transverse supporting and positioning mechanism comprises a sliding plate, a vertical fixing column, a transverse connecting plate, an adjusting screw, a motor positioning plate, a fixing support plate, a measuring part limiting plate, a buffer plate, a supporting spring and a guide rod, the sliding plate is installed at two ends of the transverse connecting plate, the vertical fixing column is installed on the upper end face of the sliding plate, the motor positioning plate is installed on the inner side of the vertical fixing column, the adjusting screw is installed on the inner side of one end of the motor positioning plate, the adjusting screw is installed on the other side of the vertical fixing column, the fixing support plate is installed on one side of the vertical fixing column, the four supporting springs are installed on the upper end face of the fixing support plate, the guide rod is installed on the inner side of each supporting spring, the buffer plate is.

Preferably, spacing guiding mechanism includes spacing post, connection loop bar, top support frame and spacing arc board, spacing post is installed at four end angles of terminal surface under the top support frame, the connection loop bar is installed in the outside of spacing post, spacing arc board is installed to the one end of connecting the loop bar.

Preferably, the upper end surface of the end supporting frame is provided with a limiting groove, the lower end surface of the bearing is fixedly connected to the inner side of the limiting groove through a screw, a bearing is arranged on the inner side of the bearing, and the connecting shaft and the supporting shaft are fixedly connected to the inner side of the bearing through the bearing.

Preferably, the one end of connecting axle and the one end of back shaft all are fixed with swivelling joint frame through the screw connection, one side of swivelling joint frame is provided with the connector, swivelling joint frame passes through connector welded fastening at braced frame's both ends, the strengthening rib support passes through the screw connection and fixes the inboard at braced frame.

Preferably, the moment detection mechanism passes through rigid coupling with the speed reducer and is connected, the inboard of protective housing one end is provided with the connecting rod, and the one end of connecting rod extends to the inboard of placing a piece one end, the inboard of placing the piece is provided with the mounting groove, torque sensor sets up the inboard at the mounting groove.

Preferably, the protective shell is connected with the shifting fork through a diaphragm type elastic coupling, the shifting fork is fixed on the outer side of the upper end of the diaphragm type elastic coupling through a screw, and a positioning head is arranged on the upper end face of the shifting fork.

Preferably, the upper end face of the sliding plate is provided with a sliding groove, the lower ends of the vertical fixing columns extend to the inner side of the sliding groove, the inner side of the upper end of one of the vertical fixing columns is provided with a groove, one end of the motor positioning plate extends to the inner side of the groove, the inner side of one end of the motor positioning plate is provided with a threaded hole, and the lower end of the adjusting screw penetrates through one end of the motor positioning plate and is fixed to the inner side of the upper end of the vertical fixing column through.

Preferably, one end of the fixed supporting plate is welded and fixed on one side of one of the vertical fixing columns, the fixed supporting plate is connected with the buffer plate through four supporting springs, a waist-shaped hole is formed in the upper end face of the buffer plate, and the measuring part limiting plate is fixed on the upper end face of the buffer plate through bolt connection.

Preferably, the top support frame passes through the screw connection to be fixed at the up end of spacing post, the one end of connecting the loop bar passes through threaded connection to be fixed in the outside of spacing post, the other end welded fastening of connecting the loop bar has spacing arc plate, one side of spacing arc plate is provided with the arc wall.

Compared with the prior art, the invention has the beneficial effects that: (1) the speed reducer reduces the rotating speed of the servo motor and then drives the rigid coupling to rotate, the arc-shaped groove arranged at one end of the limiting arc plate limits the protective shell, the deflection of a measured piece caused by rotation is reduced, and when the servo motor drives the shifting fork to rotate, the moment sensor can measure the starting moment, the instantaneous moment and the average moment of the measured piece through the deformation of the strain gauge; (2) according to the invention, the rotary connecting frame drives the supporting frame to rotate, when the shifting fork is rotated to a horizontal state, the motor positioning plate supports the servo motor, so that the buffer plate is pressed and buffered through the supporting spring, the vibration sense of the structure is conveniently reduced, the rotary handle is arranged on the upper end surface of the adjusting screw rod, the rotary handle is operated to drive the motor positioning plate to adjust the height, and the horizontal angle of the servo motor is finely adjusted, so that the detection is more accurate.

Drawings

Fig. 1 is a schematic structural view of the whole of the present invention.

Fig. 2 is a top view of the present invention as a whole.

Fig. 3 is a partial structural schematic view of the lateral supporting and positioning mechanism of the present invention.

FIG. 4 is a schematic view of a partial cross-sectional structure of the bottom bracket of the present invention.

Fig. 5 is a partial sectional view of the rotary support mechanism of the present invention.

FIG. 6 is a schematic view of a partial cross-sectional structure of a placement block of the present invention.

In the figure: 1. a bottom support frame; 2. a transverse supporting and positioning mechanism; 201. a slide plate; 202. a vertical fixing column; 203. a transverse connecting plate; 204. adjusting the screw rod; 205. a motor positioning plate; 206. fixing the support plate; 207. a measuring part limiting plate; 208. a buffer plate; 209. a support spring; 210. a guide bar; 3. a bottom adjusting positioning plate; 4. a rotation support mechanism; 401. an end support frame; 402. bearing; 403. a steering motor; 404. a connecting shaft; 405. a rotating connecting frame; 406. a support frame; 407. a reinforcing rib bracket; 408. a support shaft; 5. a limiting guide mechanism; 501. a limiting column; 502. connecting the loop bar; 503. a top support frame; 504. a limiting arc plate; 6. a servo motor; 7. a speed reducer; 8. a rigid coupling; 9. a torque detection mechanism; 901. a protective housing; 902. placing the blocks; 903. a torque sensor; 10. a diaphragm type elastic coupling; 11. and (4) shifting a fork.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Referring to fig. 1 to 6, an embodiment of the present invention includes: a high-precision wide-range torque measuring device comprises a bottom support frame 1, wherein a rotary support mechanism 4 is installed on the upper end face of the bottom support frame 1, the rotary support mechanism 4 comprises an end support frame 401, a bearing pack 402, a steering motor 403, a connecting shaft 404, a rotary connecting frame 405, a support frame 406, reinforcing rib supports 407 and a support shaft 408, two reinforcing rib supports 407 are installed on the inner side of the support frame 406, rotary connecting frames 405 are installed on two ends of the support frame 406, a connecting head is arranged on one side of each rotary connecting frame 405, the rotary connecting frames 405 are fixed on two ends of the support frame 406 in a welding mode through the connecting heads and connected through the rotary connecting frames 405, so that the support frame 406 can be driven by the connecting shaft 404 to rotate, a bearing pack 402 is installed on one side of each rotary connecting frame 405, a bearing is arranged on the inner side of the bearing pack 402, the connecting shaft 404 and the support shaft 408, the connecting shaft 404 and the supporting shaft 408 can be supported by the bearing parts 402, so that the structure is convenient to drive, the lower end surfaces of the bearing parts 402 are provided with the end supporting frames 401, one side of one end supporting frame 401 is provided with the transverse supporting and positioning mechanism 2, the inner side of one bearing part 402 is provided with the connecting shaft 404, one end of the connecting shaft 404 is provided with the steering motor 403, the inner side of the other bearing part 402 is provided with the supporting shaft 408, and the lower end surface of the supporting frame 406 is provided with the speed reducer 7;

The lower end surface of the speed reducer 7 is provided with a servo motor 6, one side of the bottom end of the servo motor 6 is provided with a bottom adjusting and positioning plate 3, the upper end surface of the supporting frame 406 is provided with a rigid coupling 8, the outer side of the rigid coupling 8 is provided with a limiting and guiding mechanism 5 which can limit the structure during rotation and reduce the deflection generated in the rotating process, the upper end surface of the rigid coupling 8 is provided with a torque detection mechanism 9, the torque detection mechanism 9 comprises a protective shell 901, a placing block 902 and a torque sensor 903, the outer side of the torque sensor 903 is provided with two placing blocks 902, the outer side of the placing block 902 is provided with the protective shell 901, the upper end surface of one protective shell 901 is provided with a diaphragm type elastic coupling 10, a shifting fork 11 is arranged above the diaphragm type elastic coupling 10, the whole carries out torque measurement on a measured piece, the, the torque sensor can be protected, and vertical and horizontal states can be measured.

The transverse supporting and positioning mechanism 2 comprises a sliding plate 201, vertical fixing columns 202, a transverse connecting plate 203, an adjusting screw 204, a motor positioning plate 205, a fixed supporting plate 206, a measuring part limiting plate 207, a buffer plate 208, a supporting spring 209 and a guide rod 210, wherein the sliding plate 201 is arranged at both ends of the transverse connecting plate 203, the vertical fixing columns 202 are arranged on the upper end surface of the sliding plate 201, a motor positioning plate 205 is installed to the inboard of one of them vertical fixed column 202, adjusting screw 204 is installed to the inboard of motor positioning plate 205 one end, fixed support plate 206 is installed to one side of another vertical fixed column 202, four supporting spring 209 are installed to the up end of fixed support plate 206, guide bar 210 is installed to the inboard of supporting spring 209, buffer board 208 is installed to the up end of supporting spring 209, two measuring piece limiting plates 207 are installed to the up end of buffer board 208, can be measured and support the horizontal state measured piece.

The limiting guide mechanism 5 comprises a limiting column 501, a connecting sleeve rod 502, a top supporting frame 503 and a limiting arc plate 504, the limiting column 501 is installed at four end corners of the lower end face of the top supporting frame 503, the connecting sleeve rod 502 is installed on the outer side of the limiting column 501, the limiting arc plate 504 is installed at one end of the connecting sleeve rod 502, the structure during rotation can be limited, and deflection generated in the rotation process is reduced.

The upper end face of the end supporting frame 401 is provided with a limiting groove, the lower end face of the bearing pack 402 is fixed on the inner side of the limiting groove through screw connection, a bearing is arranged on the inner side of the bearing pack 402, the connecting shaft 404 and the supporting shaft 408 are both connected and fixed on the inner side of the bearing pack 402 through the bearing, the connecting shaft 404 and the supporting shaft 408 can be supported through the bearing pack 402, and the structure can be conveniently driven.

One end of the connecting shaft 404 and one end of the supporting shaft 408 are both fixed with a rotary connecting frame 405 through screw connection, one side of the rotary connecting frame 405 is provided with a connector, the rotary connecting frame 405 is fixed at two ends of the supporting frame 406 through connector welding, the reinforcing rib support 407 is fixed at the inner side of the supporting frame 406 through screw connection, and is connected through the rotary connecting frame 405, so that the connecting shaft 404 can drive the supporting frame 406 to rotate.

Moment detection mechanism 9 passes through rigid coupling 8 with speed reducer 7 and is connected, and the inboard of protective housing 901 one end is provided with the connecting rod, and the one end of connecting rod extends to the inboard of placing a 902 one end, and the inboard of placing a 902 is provided with the mounting groove, and torque sensor 903 sets up the inboard at the mounting groove.

The protective shell 901 is connected with the shifting fork 11 through the diaphragm type elastic coupling 10, the shifting fork 11 is fixed on the outer side of the upper end of the diaphragm type elastic coupling 10 through screw connection, a positioning head is arranged on the upper end face of the shifting fork 11, and a measured part can be positioned through the positioning head so as to be convenient to rotate.

The up end of slide 201 is provided with the spout, the lower extreme of vertical fixed column 202 extends to the inboard of spout, the inboard of one of them vertical fixed column 202 upper end is provided with the recess, the one end of motor locating plate 205 extends to the inboard of recess, the inboard of motor locating plate 205 one end is provided with the screw hole, threaded connection is passed through at the one end that motor locating plate 205 was run through to adjusting screw 204's lower extreme and is fixed in the inboard of vertical fixed column 202 upper end, up end at adjusting screw 204 is provided with twist grip, operation twist grip drives adjusting screw 204 and rotates, and then drive motor locating plate 205 through threaded connection and carry out the regulation of height, and then finely tune servo motor 6's horizontal angle, make to detect more accurately.

One end welded fastening of fixed support plate 206 is in one side of one of them vertical fixed column 202, and fixed support plate 206 is connected through four supporting spring 209 with buffer board 208, and buffer board 208's up end is provided with waist type hole, and a measuring limiting plate 207 passes through bolted connection to be fixed at buffer board 208's up end for buffer board 208 receives to press and then cushions through supporting spring 209, is convenient for reduce the vibrations sense that the structure used.

Top bracing frame 503 passes through the screw connection to be fixed at the up end of spacing post 501, the one end of adapter sleeve rod 502 passes through threaded connection to be fixed in the outside of spacing post 501, the other end welded fastening of adapter sleeve rod 502 has spacing arc board 504, one side of spacing arc board 504 is provided with the arc wall, make the arc wall that spacing arc board 504 one end was provided with carry on spacingly to protective housing 901, prevent to take place the sheet structure skew in the use, and can lead to shift fork 11 through top bracing frame 503.

When the device is used, whether the functions of all parts are intact is checked, the overall structure is adjusted according to the measurement requirements of a detected piece, specifically, when vertical torque detection is needed, the detected piece is placed on the upper end face of a shifting fork 11, a positioning head is arranged on the upper end face of the shifting fork 11 and can be used for positioning the detected piece, a power supply is switched on, a servo motor 6 is started, a speed reducer 7 is used for reducing the rotating speed of the servo motor 6 and then driving a rigid coupling 8 to rotate, a connecting rod is arranged at the upper end of the rigid coupling 8, the rigid coupling 8 drives one placing block 902 to rotate through the connecting rod, the lower ends of four limiting columns 501 extend to the inner side of a supporting frame 406 through threaded connection, an arc-shaped groove arranged at one end of a limiting arc plate 504 is used for limiting a protective shell 901, sheet structure deviation in the use process is prevented, and the shifting fork 11 can be guided through a top supporting frame, the deflection of a tested piece caused by rotation is reduced, when a servo motor 6 drives a shifting fork 11 to rotate, a torque sensor 903 can measure the starting torque, the instantaneous torque and the average torque of the tested piece through the deformation of a strain gauge, when a transverse tested piece needs to be measured, a steering motor 403 is started, so that the steering motor 403 drives a connecting shaft 404 to rotate, a bearing 402 is connected to the outer sides of the connecting shaft 404 and a supporting shaft 408 through a bearing, wherein an end supporting frame 401 supports and fixes the bearing 402, one end of the connecting shaft 404 is relatively fixed with a rotating connecting frame 405, further the rotating connecting frame 405 drives a supporting frame 406 to rotate, a speed reducer 7 is connected and fixed on the lower end face of the supporting frame 406 through a screw, so that the supporting frame 406 drives a rigid coupling 8, a torque detection mechanism 9, a diaphragm type elastic coupling 10 and the shifting fork 11 to rotate, when the shifting fork 11 is rotated to a horizontal state, the vertical fixing column 202 is pushed through a sliding groove arranged on the upper end surface of the sliding plate 201, so that the motor positioning plate 205 supports the servo motor 6, a measured piece is placed on the upper end surface of the buffer plate 208 and is connected with the shifting fork 11, the buffer plate 208 is pressed and buffered through the supporting spring 209, the vibration sense of the structure use is reduced conveniently, a kidney-shaped hole is arranged on the upper end surface of the buffer plate 208, the measuring piece limiting plate 207 can be fixed on the upper end surface of the buffer plate 208 in a sliding manner through a bolt, the measured piece is limited to a certain extent, the measured piece is prevented from falling off when rotating, a rotating handle is arranged on the upper end surface of the adjusting screw 204, the rotating handle is operated to drive the adjusting screw 204 to rotate, the motor positioning plate 205 is driven to adjust the height through threaded connection, and the horizontal angle of the servo motor 6 is finely adjusted, making the detection more accurate.