CN114414170A - A detection device for a hydraulic torque converter and a method of using the same - Google Patents

Abstract

The invention relates to the technical field of hydraulic torque converter detection, in particular to a detection device of a hydraulic torque converter and a using method thereof. The detection device comprises a fixed frame and a sealing base which are respectively arranged at the upper end of a detection workbench, the fixed frame is fixedly connected with the detection workbench, a vertically movable jacking mechanism is arranged on the fixed frame, a sealing cover is fixed at the output end of the jacking mechanism and positioned at the position of the upper end of the sealing base, a clamp used for fixing a detection piece is further arranged on the upper surface of the sealing base, and a closed space is formed after the sealing cover and the sealing base are closed. According to the invention, through the structural matching design of the rotating mechanism, the device can move the detection piece to the detection position in a translation mode, and can limit and fix the detection piece after each movement, so that the detection efficiency is effectively ensured, and the detection piece is convenient to take and place.

Description

A detection device for a hydraulic torque converter and a method of using the same

technical field

The invention relates to the technical field of hydraulic torque converter detection, in particular to a detection device of a hydraulic torque converter and a method for using the same.

Background technique

The hydraulic torque converter is an important device in mechanical transmission; generally speaking, the hydraulic torque converter includes a pump wheel, a turbine and a guide wheel, wherein the pump wheel is connected with the driving shaft, and the mechanical energy input by the driving shaft depends on centrifugal force The action of the torque converter is converted into the kinetic energy and pressure of the liquid, which is then transmitted to the turbine connected to the driven shaft, thereby realizing the output of power; in the torque converter, the turbine and the pump impeller are the main rotating components, and the liquid is in the hydraulic power. The flow in the torque converter needs to ensure adequate sealing; therefore, during the assembly process of the torque converter, there are very high requirements for sealing;

In the traditional sealing detection method of the torque converter, due to the heavy weight of the torque converter and the small gap in the traditional detection device, when the detection part of the torque converter is manually placed, Very inconvenient, this detection method is inefficient, and the reliability of the detection results is limited;

Therefore, in view of the tightness of the torque converter, how to provide a detection solution that is convenient for taking and placing the torque converter has become a technical problem to be solved in the art.

SUMMARY OF THE INVENTION

The purpose of the patent of the present invention is to provide a detection device for a torque converter and a method for using the same, so as to solve the existing problems: in the traditional sealing detection method of the torque converter, due to the torque converter The weight of the torque converter is heavy, and the gap in the traditional detection device is small, which makes it very inconvenient to manually place the torque converter detection part. This detection method is inefficient and the reliability of the detection result is limited.

In order to achieve the above object, the present invention adopts the following technical solutions:

A detection device for a hydraulic torque converter includes a fixed frame and a sealing base respectively provided on the upper end of the detection workbench, the fixed frame is fixedly connected with the detection workbench, and a vertically movable top is arranged on the fixed frame. Lifting mechanism, the output end of the lifting mechanism is fixed with a sealing cover, the sealing cover is located at the position of the upper end of the sealing base, the upper surface of the sealing base is also provided with a clamp for fixing the detection piece, the sealing cover and After the sealing base is closed, a closed space is formed;

A rotating mechanism is arranged between the sealing base and the detection workbench, the sealing base is connected with the detection workbench through the rotating mechanism, one end of the rotating mechanism is set in a rotary connection with the detection workbench, and the other end of the rotating mechanism The detection workbench is set to be slidingly connected; an end corner of the detection workbench is provided with an arc surface, and both ends of the arc surface can be detachably connected with a limiter for fixing the rotation mechanism.

Preferably, the rotating mechanism includes a turret, a fixed shaft, a slide rail, a limit slider, a clamping column and a pull rod, the sealing base is fixed to the turret, and one end of the turret is inserted with a fixed shaft, The lower end of the fixed shaft is connected with the detection table by threads, and the upper and lower ends of the other end of the turret are respectively fixed with a pull rod and a clamping post, and the clamping post is clamped and connected with the limiting member;

A sliding rail is fixed on the upper surface of the detection workbench with the fixed axis as the center of the circle, the shape of the sliding rail is arc, the two ends of the sliding rail are provided with limit baffles, and the turret is also fixed with a limit stop. A position slider, the limit slider and the slide rail are slidingly connected.

Preferably, the position-limiting member includes a clamping frame and a fixed clamping base, the fixing clamping base is fixed to the detection workbench, and the clamping frame and the fixing clamping base are connected by plug connection.

Preferably, the clamping frame includes a limit splint, a limit bump, a limit guide and a connecting plate, two limit splints are symmetrically arranged on one side of the connecting plate, and the clamping post is located on the limit splint. On the inner side, the inner wall of the limit splint is fixed with a limit bump for blocking the clamping post, the limit splint and the limit bump are both elastic materials, and the end of the limit splint away from the connecting plate is inclined. Set the limit guide.

Preferably, the inner side of the fixed card base is provided with a card slot, the connecting plate is inserted into the card slot, and the clip frame is connected to the fixed card seat through the structural cooperation between the connecting plate and the card slot.

Preferably, the upper end of the sealing cover is further provided with a pressure sensor and three solenoid valves communicated with the inner side of the sealing cover, the detection end of the pressure sensor is located inside the sealing cover, and the three solenoid valves are a booster valve, Negative pressure valve and pressure relief valve;

The booster valve is connected with an external booster device, and is used for conveying air in the closed space formed after the sealing cover and the sealing base are closed, so as to increase the air force in the closed space;

The negative pressure valve is connected with an external vacuuming device, and is used to extract air from the airtight space formed after the sealing cover and the sealing base are closed, so as to reduce the air pressure in the airtight space;

The pressure relief valve is used for air pressure reduction in the closed space;

The pressure sensor is used for real-time detection of air pressure changes in the confined space.

Preferably, the upper surface of the sealing base is further provided with a sealing groove, and the inner bottom end of the sealing groove is further provided with a sealing rubber strip, and the sealing rubber strip is pressurized after the sealing cover and the sealing base are closed.

Preferably, the lower end of the detection workbench is further provided with a support frame for supporting the detection workbench, and the bottom ends of the support frame are fixed with rubber pads for increasing the antiskid property of the support frame.

A method of using a detection device for a torque converter, which is used for the detection device for the above-mentioned torque converter, the steps are as follows:

S1: The sealing base is removed from the lower end of the sealing cover by the rotating mechanism, and the rotating mechanism is fixed by the limiter;

S2: place the test piece on the upper end of the sealing base and fix it with a clamp, after the test piece is fixed, the sealing base is reset and sent to the lower end of the sealing cover by the rotating mechanism, and it is fixed by another limiter;

S3: Drive the sealing cover to move through the jacking mechanism, so that the sealing cover is inserted into the sealing groove opened on the upper surface of the sealing base, and the sealing rubber strip in the sealing groove is squeezed, so that the sealing cover and the sealing base form a closed space;

S4: carry out pressurization detection, convey air to the enclosed space through the booster valve to increase the air pressure, and perform real-time detection of the air pressure change in the enclosed space through the pressure sensor;

S5: after the pressure detection is completed, release the air in the closed space through the pressure relief valve, restore the air pressure in the closed space, and close the pressure relief valve after each air pressure reduction;

S6: carry out negative pressure detection, reduce the air pressure by drawing out the air in the closed space through the negative pressure valve, and perform real-time detection on the air pressure change in the closed space through the pressure sensor;

S7: after the negative pressure detection is completed, release the air in the closed space through the pressure relief valve, restore the air pressure in the closed space, and close the pressure relief valve after each air pressure reduction;

S8: After the detection is completed, the sealing cover is moved up by the jacking mechanism to separate the sealing cover from the sealing base, the sealing base is removed from the lower end of the sealing cover by the rotating mechanism, and the rotating mechanism is fixed by the limiter. After fixing, The test piece can be replaced and tested again.

The present invention at least has the following beneficial effects:

1. In the present invention, through the structural coordination design of the rotating mechanism, the device can move the detection piece to the detection position in a translational manner, and can limit and fix it after each movement, which effectively ensures the detection efficiency, and It makes the pick and place of the test piece more convenient.

2. In the present invention, through the structural design of the limiter, the limiter can quickly and stably limit and fix the rotating mechanism, so as to avoid movement during detection and affect the detection structure. Quickly remove and replace the card connection frame to ensure the maintenance cost.

3. The present invention enables the device to stably control the detection process through the structural coordination design of the sealing cover, the pressure sensor, the booster valve, the negative pressure valve and the pressure relief valve, ensuring the reliability of the detection results.

Description of drawings

In order to explain the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention, which are of great significance to the art For those of ordinary skill, other drawings can also be obtained from these drawings without any creative effort.

Fig. 1 is the overall structure schematic diagram of the present invention;

2 is a schematic diagram of the connection structure of the fixing frame, the jacking mechanism and the sealing cover of the present invention;

Fig. 3 is the top view of the connection structure of the rotating mechanism of the present invention and the detection workbench;

4 is an exploded view of the connection structure of the rotating mechanism of the present invention and the detection workbench;

5 is an enlarged view of the structure of the limiting member of the present invention;

FIG. 6 is a schematic diagram of the overall structure of the clamping frame of the present invention;

Fig. 7 is the top view of the upper end structure of the sealing cover of the present invention;

8 is a cross-sectional view of the connection structure of the sealing cover and the sealing base of the present invention.

In the figure: 1. Inspection table; 2. Fixing frame; 3. Jacking mechanism; 4. Sealing cover; 5. Sealing base; 6. Supporting frame; 7. Pressure sensor; 8. Booster valve; 9. Negative pressure valve; 10, pressure relief valve; 11, sealing strip; 12, turret; 13, fixed shaft; 14, slide rail; 15, limit slider; 16, snap post; 17, tie rod; 18, snap 19. Fixed card seat; 20. Limiting splint; 21. Limiting bump; 22. Limiting guide plate; 23. Connecting plate; 24. Card slot.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

Example 1:

1 to 8, a detection device for a torque converter includes a fixing frame 2 and a sealing base 5 respectively provided on the upper end of the detection workbench 1, the fixing frame 2 and the detection workbench 1 are fixedly connected, and the fixing frame is 2 is provided with a vertically movable jacking mechanism 3, the output end of the jacking mechanism 3 is fixed with a sealing cover 4, the sealing cover 4 is located at the upper end of the sealing base 5, and the upper surface of the sealing base 5 is also provided with a fixed detection The clamp of the parts, the sealing cover 4 and the sealing base 5 are closed to form a closed space;

The upper end of the sealing cover 4 is also provided with a pressure sensor 7 and three solenoid valves that communicate with the inner side of the sealing cover 4. In order to facilitate the detection of the pressure in the closed space, the detection end of the pressure sensor 7 is located inside the sealing cover 4, and the three electromagnetic valves are located inside the sealing cover 4. The valves are a booster valve 8, a negative pressure valve 9 and a pressure relief valve 10;

In order to realize the increased detection, the booster valve 8 is connected with the external booster equipment for conveying air in the closed space formed after the sealing cover 4 and the sealing base 5 are closed to increase the air force in the closed space;

In order to realize the negative pressure detection, the negative pressure valve 9 is connected with the external vacuuming equipment, and is used to extract the air from the airtight space formed after the sealing cover 4 and the sealing base 5 are closed, and reduce the air pressure in the airtight space;

The pressure relief valve 10 is used for air pressure reduction in a closed space;

The pressure sensor 7 is used for real-time detection of changes in air pressure in the enclosed space.

From the above, it can be seen that the detection part is fixed by the clamp on the upper surface of the sealing base 5, and a sealed space is formed after the sealing cover 4 and the sealing base 5 are closed, and the pressure sensor 7 is opened to transport air into the sealed space to increase the internal air pressure, To achieve supercharging detection, open the negative pressure valve 9 to extract the air in the closed space, reduce the internal air pressure, and realize the negative pressure detection. After each detection, the pressure in the closed space is released by opening the pressure relief valve 10 to avoid The two pressure detections cause the pressure in the closed space to be different from the outside, which affects the detection structure, and the pressure relief valve 10 is closed after each air pressure reduction.

Further, in order to ensure the tightness between the sealing cover 4 and the sealing base 5, a sealing groove is also opened on the upper surface of the sealing base 5, and the inner bottom end of the sealing groove is also provided with a sealing rubber strip 11, the sealing cover 4 and the sealing base 5. After closing, the sealing strip 11 will be pressurized.

In order to facilitate the loading and unloading operation of the detection piece, a rotating mechanism is provided between the sealing base 5 and the detection table 1, and the sealing base 5 is connected with the detection table 1 through the rotation mechanism. One end of the mechanism is set in a rotational connection with the detection table 1, and the other end of the rotation mechanism is set in a sliding connection with the detection table 1; for the convenience of manual operation and the convenience of limiting and fixing the moving rotating mechanism, the detection table 1 One end corner is provided with an arc surface, and both ends of the arc surface can be detachably connected with a limiter for fixing the rotating mechanism;

Specifically, the rotating mechanism includes a turret 12, a fixed shaft 13, a slide rail 14, a limit slider 15, a clamping column 16 and a pull rod 17. The sealing base 5 is fixed to the turret 12, and one end of the turret 12 is inserted with a The fixed shaft 13, in order to facilitate maintenance, the rotating mechanism can be separated from the detection table 1, the lower end of the fixed shaft 13 and the detection table 1 are screwed; The connecting column 16, the clamping column 16 is connected with the limiter by clamping;

Further, in order to make the movement of the rotating mechanism more stable, a slide rail 14 is fixed on the upper surface of the detection table 1 with the fixed shaft 13 as the center of the circle. The baffle, the turret 12 is also fixed with a limit slider 15 , and the limit slider 15 is slidingly connected with the slide rail 14 .

From the above, it can be seen that the sealing base 5 can be moved out from the lower end of the sealing cover 4 in a translational manner and along the arc trajectory through the rotating mechanism. After each movement of the rotating mechanism, the limiter is used to limit and fix it to ensure the stability of each movement. The convenience of picking and placing test pieces is improved.

Wherein, the limiter includes a clamping frame 18 and a fixed clamping base 19, the fixing clamping base 19 is fixed with the detection table 1, and the clamping frame 18 and the fixing clamping base 19 are connected by plugging;

Specifically, the clamping frame 18 includes a limit splint 20 , a limit bump 21 , a limit guide plate 22 and a connecting plate 23 , two limit splints 20 are symmetrically arranged on one side of the connecting plate 23 , and the clamping post 16 is located at the limit On the inner side of the position splint 20 , the inner wall of the limit splint 20 is fixed with a limit bump 21 for blocking the clamping post 16 , the limit splint 20 and the limit bump 21 are both elastic materials, and the limit splint 20 is far away from the connecting plate 23 One end of the slanted position limiting guide plate 22;

In order to facilitate the maintenance of the stopper and facilitate the disassembly and replacement of the clamping frame 18, a clamping slot 24 is formed on the inner side of the fixed clamping base 19, and the connecting plate 23 is inserted into the interior of the clamping slot 24. The slot 24 is connected with the fixed socket 19 by the structural cooperation.

From the above, it can be seen that each time the limit is moved, the clamping column 16 is guided by the limiting guide plate 22 , and the clamping column 16 is moved to the inner side of the limiting splint 20 . The position bump 21 limits the position of the clamping post 16, and completes the position limit and fixation of the rotation mechanism by the position limiter;

Due to the material properties of the limiting splint 20 and the limiting projection 21 , when the clamping post 16 enters the limiting splint 20 or moves out from the interior of the limiting splint 20 , the limiting splint 20 will be bent and deformed, and the clamping post 16 After completely entering the interior of the limiting splint 20 or completely removing it from the interior of the limiting splint 20, it will be reset through the elastic deformation of the material;

Further, the lower end of the inspection workbench 1 is also provided with a support frame 6 for supporting the inspection workbench 1 , and the bottom ends of the support frame 6 are fixed with rubber pads for increasing the antiskid property of the support frame 6 .

Example 2:

On the basis of above-mentioned embodiment 1, disclose its using method:

The first step: remove the sealing base 5 from the lower end of the sealing cover 4 through the rotating mechanism, and fix the rotating mechanism through the limiter;

The second step: place the detection part on the upper end of the sealing base 5 and fix it by a clamp. After the detection part is fixed, the sealing base 5 is reset and sent to the lower end of the sealing cover 4 by the rotating mechanism, and another limiter is passed. fix it;

The third step: drive the sealing cover 4 to move by the jacking mechanism 3, so that the sealing cover 4 is inserted into the sealing groove opened on the upper surface of the sealing base 5, and the sealing rubber strip 11 in the sealing groove is squeezed, so that the sealing cover 4 and The sealing base 5 forms a closed space;

The 4th step: carry out pressurization detection, convey the air to increase air pressure in the enclosed space through the booster valve 8, and carry out real-time detection to the air pressure change in the enclosed space by the pressure sensor 7;

Step 5: after the pressure detection is completed, release the air in the closed space through the pressure relief valve 10, restore the air pressure of the closed space, and close the pressure relief valve 10 after each air pressure reduction;

The 6th step: carry out negative pressure detection, draw out air in the closed space to reduce the air pressure by the negative pressure valve 9, and detect the air pressure change in the closed space in real time by the pressure sensor 7;

Step 7: after the negative pressure detection is completed, release the air in the closed space through the pressure relief valve 10, restore the air pressure of the closed space, and close the pressure relief valve 10 after each air pressure reduction;

Step 8: After the detection is completed, the sealing cover 4 is moved up by the jacking mechanism 3 to separate the sealing cover 4 from the sealing base 5, and the sealing base 5 is moved out from the lower end of the sealing cover 4 by the rotating mechanism, and is rotated by the limiter. The mechanism is fixed, and after fixing, the detection part can be replaced and tested again.

The foregoing has shown and described the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions describe only the principles of the present invention. Without departing from the spirit and scope of the present invention, there are various Variations and improvements are intended to fall within the scope of the claimed invention. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims (9)

1. The detection device for the hydraulic torque converter is characterized by comprising a fixing frame (2) and a sealing base (5) which are respectively arranged at the upper end of a detection workbench (1), wherein the fixing frame (2) is fixedly connected with the detection workbench (1), a vertically movable jacking mechanism (3) is arranged on the fixing frame (2), a sealing cover (4) is fixed at the output end of the jacking mechanism (3), the sealing cover (4) is positioned at the position of the upper end of the sealing base (5), a clamp for fixing a detection piece is further arranged on the upper surface of the sealing base (5), and a closed space is formed after the sealing cover (4) and the sealing base (5) are closed;

a rotating mechanism is arranged between the sealing base (5) and the detection workbench (1), the sealing base (5) is connected with the detection workbench (1) through the rotating mechanism, one end of the rotating mechanism is rotatably connected with the detection workbench (1), and the other end of the rotating mechanism is slidably connected with the detection workbench (1); one end angle of the detection workbench (1) is provided with an arc surface, and both ends of the arc surface can be detachably connected with limiting parts used for fixing the rotating mechanism.

2. The detecting device of the torque converter according to claim 1, wherein the rotating mechanism comprises a rotating frame (12), a fixed shaft (13), a slide rail (14), a limiting slide block (15), a clamping column (16) and a pull rod (17), the sealing base (5) is fixed to the rotating frame (12), the fixed shaft (13) is inserted into one end of the rotating frame (12), the lower end of the fixed shaft (13) is in threaded connection with the detecting workbench (1), the pull rod (17) and the clamping column (16) are respectively fixed to the upper end and the lower end of the other end of the rotating frame (12), and the clamping column (16) is connected with the limiting piece in a clamping mode;

the upper surface of detection workstation (1) uses fixed axle (13) to be fixed with slide rail (14) as the centre of a circle, the shape of slide rail (14) is the arc, the both ends of slide rail (14) all are provided with limit baffle, still be fixed with spacing slider (15) on rotating turret (12), spacing slider (15) are sliding connection with slide rail (14).

3. The detecting device for the torque converter according to claim 2, wherein the limiting member comprises a clamping frame (18) and a fixing clamping seat (19), the fixing clamping seat (19) is fixed to the detecting table (1), and the clamping frame (18) is connected with the fixing clamping seat (19) in an inserting manner.

4. The detecting device of the torque converter according to claim 3, wherein the clamping frame (18) comprises a limiting clamp plate (20), a limiting convex block (21), a limiting guide plate (22) and a connecting plate (23), two limiting clamp plates (20) are symmetrically arranged on one side of the connecting plate (23), the clamping column (16) is located on the inner side of the limiting clamp plate (20), the limiting convex block (21) used for blocking the clamping column (16) is fixed on the inner wall of each limiting clamp plate (20), the limiting clamp plate (20) and the limiting convex block (21) are both made of elastic materials, and the limiting guide plate (22) is obliquely arranged at one end, far away from the connecting plate (23), of the limiting clamp plate (20).

5. The detecting device for the torque converter according to claim 4, wherein a clamping groove (24) is formed in the inner side of the fixing clamping seat (19), the connecting plate (23) is inserted into the clamping groove (24), and the clamping frame (18) is connected with the fixing clamping seat (19) through structural matching of the connecting plate (23) and the clamping groove (24).

6. The detecting device of the torque converter according to claim 1, wherein the upper end of the sealing cover (4) is further provided with a pressure sensor (7) and three electromagnetic valves communicated with the inner side of the sealing cover (4), the detecting end of the pressure sensor (7) is located inside the sealing cover (4), and the three electromagnetic valves are a pressure increasing valve (8), a negative pressure valve (9) and a pressure releasing valve (10);

the booster valve (8) is connected with external booster equipment and is used for conveying air in a closed space formed after the sealing cover (4) and the sealing base (5) are closed so as to increase the strength in the closed space;

the negative pressure valve (9) is connected with external vacuum pumping equipment and is used for pumping air out of a closed space formed after the sealing cover (4) and the sealing base (5) are closed so as to reduce the air pressure in the closed space;

the pressure release valve (10) is used for reducing the air pressure in the closed space;

the pressure sensor (7) is used for detecting the air pressure change in the closed space in real time.

7. The device for detecting the torque converter according to claim 6, wherein a sealing groove is further formed in the upper surface of the sealing base (5), a sealing rubber strip (11) is further arranged at the inner bottom end of the sealing groove, and the sealing rubber strip (11) is pressurized after the sealing cover (4) and the sealing base (5) are closed.

8. The detecting device for the torque converter according to claim 1, wherein a supporting frame (6) for supporting the detecting workbench (1) is further arranged at the lower end of the detecting workbench (1), and rubber pads for increasing the skid resistance of the supporting frame (6) are fixed at the bottom ends of the supporting frame (6).

9. The use method of the detection device of the hydraulic torque converter is characterized by comprising the following steps of:

s1, moving the sealing base (5) out of the lower end of the sealing cover (4) through the rotating mechanism, and fixing the rotating mechanism through a limiting piece;

s2, placing the detection piece on the upper end of the sealing base (5) and fixing the detection piece through a clamp, resetting the sealing base (5) through a rotating mechanism after the detection piece is fixed, conveying the detection piece to the lower end of the sealing cover (4), and fixing the detection piece through another limiting piece;

s3, the sealing cover (4) is driven to move through the jacking mechanism (3), so that the sealing cover (4) is inserted into a sealing groove formed in the upper surface of the sealing base (5), and a sealing rubber strip (11) in the sealing groove is extruded, so that a sealed space is formed between the sealing cover (4) and the sealing base (5);

s4, carrying out pressurization detection, conveying air into the closed space through a pressurization valve (8) to increase air pressure, and carrying out real-time detection on air pressure change in the closed space through a pressure sensor (7);

s5, after the pressurization detection is finished, releasing air in the closed space through a pressure release valve (10), reducing the air pressure of the closed space, and closing the pressure release valve (10) after each air pressure reduction;

s6, performing negative pressure detection, namely pumping air out of the closed space through a negative pressure valve (9) to reduce air pressure, and detecting the change of the air pressure in the closed space in real time through a pressure sensor (7);

s7, after the negative pressure detection is finished, releasing the air in the closed space through a pressure release valve (10), reducing the air pressure of the closed space, and closing the pressure release valve (10) after each air pressure reduction;

and S8, after detection is finished, the sealing cover (4) is moved upwards through the jacking mechanism (3) to separate the sealing cover (4) from the sealing base (5), the sealing base (5) is moved out from the lower end of the sealing cover (4) through the rotating mechanism, the rotating mechanism is fixed through the limiting piece, and after the rotating mechanism is fixed, the detection piece can be replaced and used for detection again.

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