Rotating speed detection device for hydraulic coupler

Abstract

The invention relates to the field of rotating speed detection, in particular to a hydraulic coupler rotating speed detection device which comprises a detection table, a bearing seat is connected to the side face of the detection table, a pushing and connecting piece is arranged in the bearing seat, two pushing sleeve rings are symmetrically arranged on the pushing and connecting piece, and the opposite faces of the two pushing sleeve rings are inclined faces. Inserting shaft sleeves are arranged in the middles of the two pushing sleeve rings, the edges of notches of the inserting shaft sleeves are arranged in a bevel edge mode, bearing frames are coaxially and rotationally installed on the outer surfaces of the inserting shaft sleeves, the bearing frames are elastically connected with the pushing sleeve rings, and a speed measuring gear is coaxially embedded in the end of one inserting shaft sleeve. The detection efficiency is improved, the labor intensity of detection personnel is reduced, it is ensured that the lock sleeve key can be smoothly inserted into the key groove in the hydraulic coupler, and meanwhile it is ensured that the rotating speed detection process is not hindered by the positioning key.

Description

Technical Field

[0001] This invention relates to the field of rotational speed detection, and more particularly to a rotational speed detection device for a hydraulic coupler. Background Technology

[0002] A hydraulic coupling is a non-rigid transmission device that relies on the kinetic energy of a fluid to transmit power, and it is widely used in industrial transmission systems. To test the transmission efficiency of a hydraulic coupling, it is usually necessary to measure the rotational speed of the coupling's output shaft to determine whether the transmission efficiency is good.

[0003] During the testing process, magnetic speed sensors are often used for detection. However, in actual testing, the testing personnel need to first install the input end of the hydraulic coupler and the servo motor together, and then install the speed measuring gear and the output end of the hydraulic coupler together before the magnetic speed sensor can be used for detection. This operation process is time-consuming, resulting in low testing efficiency and increasing the labor intensity of the testing personnel. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of the prior art by proposing a hydraulic coupling speed detection device.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a hydraulic coupling speed detection device, comprising a detection platform, a support base connected to the side of the detection platform, a pusher member disposed inside the support base, two push rings symmetrically disposed on the pusher member, the opposing surfaces of the two push rings being inclined, a bushing sleeve disposed in the middle of each of the two push rings, the notch edge of the bushing sleeve being inclined, a support frame coaxially rotatably mounted on the outer surface of the bushing sleeve, the support frame being elastically connected to the push rings, and one of the bushing sleeves... The end of the device is coaxially inlaid with a speed measuring gear. A magnetic speed sensor is fixedly installed on the upper end of one of the bearing frames. The magnetic speed sensor is close to the speed measuring gear. A drive rod is rotatably installed on the upper end of the detection platform. The other insert sleeve is slidably installed on the outer surface of the drive rod. A shaft support positioning component is provided between the two push sleeves. The shaft support positioning component is connected to the bearing seat. A locking key is elastically installed through the lower part of the opposite ends of the two insert sleeves. A ball is fitted to the inner surface of the push sleeve and is connected to the locking key.

[0006] Preferably, a main servo motor is fixedly installed at the upper end of the testing platform. The output end of the main servo motor is fixed to the drive rod. Two transmission ears extend symmetrically from the outer surface of the drive rod. An adaptation groove is provided through the outer surface of the other insertion shaft sleeve. The transmission ear is slidably installed inside the adaptation groove.

[0007] Preferably, the lower end of the locking key extends to a key seat, and the lower end of the key seat extends symmetrically to two slide rods. The lower ends of the two slide rods are fixedly mounted with connecting seats, which are rotatably mounted on the outer surface of the ball. Door seats are slidably mounted on the outer surfaces of the two slide rods. One end of the key seat is located inside the door seat, and the end of the door seat is fixed to the insert sleeve. A push key spring is wound around the outside of the slide rod, and the two ends of the push key spring are fixed to the connecting seat and the door seat respectively. The push key spring is in a tensioned state.

[0008] Preferably, a display stand is fixedly installed at the lower end of the support base, and the end of the display stand is fixed to the testing table.

[0009] Preferably, the pusher includes a threaded rod rotatably mounted inside the bearing seat. Both ends of the threaded rod extend through both sides of the bearing seat, and the threads at both ends of the threaded rod are symmetrically arranged. Each end of the threaded rod is screwed with a threaded sleeve, which is located inside the bearing seat. Two support rings extend symmetrically from the outer surfaces of the two threaded sleeves, respectively extending from the front and rear ends of the bearing seat. The support rings are slidably fitted with the bearing seat. The support rings on the two threaded sleeves are respectively fixed to two pusher rings. A secondary servo motor is connected to one side of the threaded rod, and the secondary servo motor is fixed to the testing table.

[0010] Preferably, both ends of the support frame are slidably mounted with support rods. One end of the support rod is fixed to a push ring. A push spring is wound around the outside of the support rod. Both ends of the push spring are fixed to the support frame and the other end of the support rod, respectively. The push spring is in a tensioned state. The other end of the support rod extends with a top claw, which abuts against the support frame.

[0011] Preferably, the support shaft positioning component includes two guide shells symmetrically arranged between two push sleeve rings. A guide rod is slidably installed inside the guide shell, and the guide rod extends through the upper end of the guide shell. A positioning key is fixedly installed at the upper end of the guide rod. Two brackets are symmetrically arranged between the two guide shells. The brackets and guide shells are fixed to the upper end of the bearing seat. Two support rollers are symmetrically arranged at the upper end of the brackets.

[0012] Preferably, the outer surface of the guide rod extends with a protruding ear, and the outer surface of the guide shell is provided with a through groove. The protruding ear passes through the inside of the through groove and is slidably engaged with the through groove. A key frame is rotatably mounted at the end of the protruding ear, and an ear rod is rotatably mounted at the end of the key frame. The ear rod is slidably engaged with the guide shell. A push ear extends from the lower end of the push ring and abuts against the end of the ear rod. A return spring is fixedly mounted on the inner bottom surface of the guide shell, and the end of the return spring is fixed to the lower end of the guide rod.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. Two opposing push rings drive two insert sleeves to move in opposite directions, respectively, to engage with the output and input shafts of the hydraulic coupler. At this time, the insert sleeves remain stationary due to the support of the hydraulic coupler shaft. Subsequently, the push rings continue to move in opposite directions, which in turn causes the spring to deform, allowing the push rings to continue moving. At the same time, the ball rolls along the inclined surface of the push rings and gradually moves upward, thereby driving the locking key to gradually move upward, allowing the locking key to engage with the keyway on the shaft of the hydraulic coupler. This ensures that the insert sleeves and the shaft of the hydraulic coupler are firmly locked together, allowing them to rotate synchronously. This synchronously completes the installation of the speed measuring gear on the output shaft of the hydraulic coupler and the main servo motor on the input shaft of the hydraulic coupler, shortening the installation time, improving the testing efficiency, and eliminating the need for manual installation by testing personnel, effectively reducing the labor intensity of testing personnel.

[0014] 2. When the hydraulic coupler is placed at the testing station, the support rollers support the output and input shafts of the hydraulic coupler. At the same time, the positioning key is inserted into the keyway on the shaft for positioning, ensuring that the subsequent locking key can smoothly engage with the keyway on the hydraulic coupler. Simultaneously, when the locking key is inserted into the keyway, the ball rolls to the horizontal section of the push ring, and the push lug on the push ring contacts the lug rod. Then, the two push rings continue to move towards each other. At this time, the ball rolls on the horizontal section of the push ring, keeping the locking key engaged in the keyway. The push lug, driven by the push ring, pushes the lug rod, causing the key shifter to move and push the guide rod downward, thereby moving the positioning key downward to disengage it from the keyway. This ensures that the speed test is not obstructed by the positioning key. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a hydraulic coupling speed detection device according to the present invention; Figure 2 This invention relates to a hydraulic coupler speed detection device. Figure 1 A magnified view of middle A; Figure 3 This is a schematic diagram of the push ring of a hydraulic coupler speed detection device according to the present invention; Figure 4 This is a schematic diagram of the speed measuring gear of a hydraulic coupler speed detection device according to the present invention; Figure 5 This is a schematic diagram of the keyway frame of a hydraulic coupler speed detection device according to the present invention; Figure 6 This is an internal view of the guide shell of a hydraulic coupler speed detection device according to the present invention; Figure 7 This is a schematic diagram of the rolling ball of a hydraulic coupler speed detection device according to the present invention; Figure 8 This is a schematic diagram of the auxiliary servo motor of a hydraulic coupler speed detection device according to the present invention; Figure 9 This is a view of the hydraulic coupling speed detection device according to the present invention. Figure 10 This is a cross-sectional view of the connection between the hydraulic coupler and the insert sleeve in a hydraulic coupler speed detection device of the present invention.

[0016] In the diagram: 1. Testing table; 2. Display stand; 3. Bearing seat; 4. Guide shell; 5. Bracket; 6. Push ring; 7. Speed ​​measuring gear; 8. Insert shaft sleeve; 9. Drive rod; 10. Main servo motor; 11. Support roller; 12. Positioning key; 13. Ball bearing; 14. Magnetic speed sensor; 15. Bearing frame; 16. Top claw; 17. Push spring; 18. Frame rod; 19. Push ear; 20. Keyway frame; 21. Ear rod; 22. Through slot; 23. Guide rod; 24. Extending ear; 25. Return spring; 26. Locking key; 27. Door seat; 28. Slide rod; 29. ​​Key seat; 30. Push key spring; 31. Connecting seat; 32. Threaded sleeve; 33. Support ring frame; 34. Secondary servo motor; 35. Threaded rod; 36. Hydraulic coupler; 37. Keyway; 38. Adaptive slot; 39. Transmission ear. Detailed Implementation

[0017] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are merely examples, and those skilled in the art may conceive of other obvious variations.

[0018] like Figures 1-10The device for detecting the rotational speed of a hydraulic coupler includes a detection platform 1. A support base 3 is connected to the side of the detection platform 1. A pusher is installed inside the support base 3. Two pusher rings 6 are symmetrically arranged on the pusher. The opposing surfaces of the two pusher rings 6 are inclined, allowing a ball 13 to roll and gradually move upward along the inclined surfaces of the pusher rings 6. This, in turn, causes the locking key 26 to gradually move upward, allowing the locking key 26 to be inserted into the keyway 37 on the shaft of the hydraulic coupler 36, thus connecting the shaft sleeve 8 and the hydraulic coupler. The shaft of the coupler 36 can be firmly locked. Each of the two push rings 6 has a shaft insert 8 at its center. The notch edge of the shaft insert 8 is beveled, allowing the positioning key 12 to easily enter the notch of the shaft insert 8 for positioning during insertion. The shaft insert 8 serves to engage with the shaft of the hydraulic coupler 36. A support frame 15 is coaxially mounted on the outer surface of the shaft insert 8, providing support for the shaft insert 8. The support frame 15 is elastically connected to the push rings 6. One of the insert rings... The end of the bushing 8 is coaxially inlaid with a speed measuring gear 7. A magnetic speed sensor 14 is fixedly installed on the upper end of one of the support frames 15. The magnetic speed sensor 14 is close to the speed measuring gear 7. Since the speed measurement of the speed measuring gear 7 by the magnetic speed sensor 14 is existing technology and has been widely used, it is not described in detail here. A drive rod 9 is rotatably installed on the upper end of the detection table 1. Another bushing 8 is slidably installed on the outer surface of the drive rod 9, which can ensure that the other bushing 8 will not be obstructed when moving towards the hydraulic coupler 36. A shaft support positioning component is provided between the two push rings 6. The shaft support positioning component is connected to the support seat 3. A locking key 26 is elastically installed through the lower part of the opposite ends of the two bushings 8. The locking key 26 can be inserted into the keyway 37 on the shaft of the hydraulic coupler 36, so that the bushing 8 and the hydraulic coupler 36 can rotate synchronously. A ball 13 is fitted on the inner surface of the push ring 6. The ball 13 is connected to the locking key 26.

[0019] A main servo motor 10 is fixedly installed on the upper end of the testing table 1. The output end of the main servo motor 10 is fixed to the drive rod 9. The main servo motor 10 drives the drive rod 9 to rotate. Two transmission ears 39 extend symmetrically from the outer surface of the drive rod 9. An adaptation groove 38 is opened through the outer surface of another insert sleeve 8. The transmission ears 39 are slidably installed inside the adaptation groove 38. The cooperation between the transmission ears 39 and the adaptation groove 38 allows the other insert sleeve 8 to slide normally while ensuring that it is driven by the drive rod 9 to rotate.

[0020] The lower end of the locking key 26 extends to a key seat 29, and two slide rods 28 extend symmetrically from the lower end of the key seat 29. The key seat 29 serves as a connection, and a connecting seat 31 is fixedly installed at the lower end of the two slide rods 28. The connecting seat 31 is rotatably mounted on the outer surface of the ball 13 and serves to support the ball 13. A door seat 27 is slidably installed on the outer surface of the two slide rods 28. The slide rods 28 and the door seat 27 serve to guide the locking key 26. One end of the key seat 29 is located inside the door seat 27, and the end of the door seat 27 is fixed to the insert sleeve 8. A push key spring 30 is wound around the outside of the slide rods 28. The two ends of the push key spring 30 are fixed to the connecting seat 31 and the door seat 27, respectively. The push key spring 30 is in a tensioned state and serves to reset the locked key 26 after it has been moved.

[0021] The lower end of the support base 3 is fixedly installed with a display stand 2. The end of the display stand 2 is fixed to the testing table 1. The display stand 2 serves to support and fix the support base 3.

[0022] The push-fit component includes a threaded rod 35 rotatably mounted inside the bearing seat 3. The two ends of the threaded rod 35 extend through both sides of the bearing seat 3, and the threads at both ends of the threaded rod 35 are symmetrically arranged, which can drive two threaded sleeves 32 to move towards each other. Threaded sleeves 32 are screwed onto both ends of the threaded rod 35. The threaded sleeves 32 are located inside the bearing seat 3. Two support rings 33 extend symmetrically from the outer surfaces of the two threaded sleeves 32. The two support rings 33 extend through the front and rear ends of the bearing seat 3, respectively, and slide with the bearing seat 3. The support rings 33 can fix the push rings 6 and the threaded sleeves 32 together on the one hand, and guide the threaded sleeves 32 on the other hand. The support rings 33 on the two threaded sleeves 32 are fixed to the two push rings 6 respectively. A secondary servo motor 34 is connected to one side of the threaded rod 35. The secondary servo motor 34 drives the threaded rod 35 to rotate. The secondary servo motor 34 is fixed to the detection table 1.

[0023] Both ends of the support frame 15 are slidably mounted with support rods 18. One end of the support rod 18 is fixed to the push sleeve 6. The support rod 18 serves to guide the support frame 15. A push spring 17 is wound around the outside of the support rod 18. The two ends of the push spring 17 are fixed to the support frame 15 and the other end of the support rod 18, respectively. The push spring 17 is in a tensioned state. The other end of the support rod 18 extends to a top claw 16. The top claw 16 presses against the support frame 15, which can firmly restrict the hydraulic coupling 36 between the two insert sleeves 8.

[0024] The shaft positioning component includes two guide shells 4 symmetrically arranged between two push sleeve rings 6. A guide rod 23 is slidably installed inside the guide shell 4. The guide rod 23 extends through the upper end of the guide shell 4. The guide shell 4 and the guide rod 23 serve to guide the positioning key 12. The positioning key 12 is fixedly installed at the upper end of the guide rod 23. Two brackets 5 are symmetrically arranged between the two guide shells 4. The positioning key 12 serves to position the keyway 37 on the hydraulic coupler 36 and prevent the insert sleeve 8 from rotating. The brackets 5 and the guide shells 4 are both fixed to the upper end of the bearing seat 3. Two rollers 11 are symmetrically arranged at the upper end of the brackets 5. The rollers 11 can support the output shaft and input shaft of the hydraulic coupler 36 and align them with the insert sleeve 8.

[0025] The outer surface of the guide rod 23 extends with an extension ear 24. The outer surface of the guide shell 4 is provided with a through groove 22. The extension ear 24 passes through the inside of the through groove 22. The through groove 22 serves to allow the extension ear 24 to extend. The extension ear 24 is slidably engaged with the through groove 22. A key shifter 20 is rotatably mounted at the end of the extension ear 24. An ear rod 21 is rotatably mounted at the end of the key shifter 20. The ear rod 21 is slidably engaged with the guide shell 4. A push ear 19 extends from the lower end of the push ring 6. The push ear 19 abuts against the end of the ear rod 21. A return spring 25 is fixedly mounted on the inner bottom surface of the guide shell 4. The return spring 25 serves to reset the moved positioning key 12. The end of the return spring 25 is fixed to the lower end of the guide rod 23. The push ear 19 pushes the ear rod 21 under the action of the push ring 6, causing the key shifter 20 to move and push the guide rod 23, allowing the guide rod 23 to move downward, thereby causing the positioning key 12 to move downward and disengage from the keyway 37.

[0026] During testing, the hydraulic coupling 36 is placed at the testing station. The support rollers 11 support the output and input shafts of the hydraulic coupling 36. Simultaneously, the positioning key 12 engages with the keyway 37 on the shaft for positioning. Then, the auxiliary servo motor 34 drives the threaded rod 35 to rotate, causing the two threaded sleeves 32 to move towards each other. This, in turn, causes the two push rings 6 to move towards each other. The two push rings 6, moving towards each other, respectively drive the two insert sleeves 8 to move towards each other, thus engaging with the output and input shafts of the hydraulic coupling 36. At this time, the insert sleeves 8 remain stationary due to the shaft support of the hydraulic coupling 36. Simultaneously, after insertion, the positioning key 12 will engage with the notch on the insert sleeve 8 to restrict the insert sleeve 8 and prevent it from rotating. Then, the push rings 6 continue to move towards each other, at which point the spring 17 deforms, allowing the push rings 6 to continue moving. At the same time, the ball 13 rolls along the inclined surface of the push rings 6 and gradually moves upward, thereby driving the locking key 26 to gradually move upward, allowing the locking key 26 to engage with the keyway 37 on the shaft of the hydraulic coupler 36. This securely locks the insert sleeve 8 and the shaft of the hydraulic coupler 36, thereby locking the speed measuring gear 7 and the output shaft of the hydraulic coupler 36. The main servo motor 10 and the input shaft of the hydraulic coupler 36 are installed together. When the locking key 26 is inserted into the keyway 37, the ball 13 rolls to the horizontal section of the push ring 6, and at the same time, the push lug 19 on the push ring 6 contacts the lug 21. Then, the two push rings 6 continue to move towards each other. At this time, the ball 13 rolls in the horizontal section of the push ring 6, keeping the locking key 26 inserted into the keyway 37. The push lug 19, driven by the push ring 6, pushes the lug 21, causing the key shifter 20 to move and push the guide rod 23, allowing the guide rod 23 to move downward. This causes the positioning key 12 to move downwards and disengage from the keyway 37. At this point, the top claw 16 rests against the support frame 15, firmly securing the hydraulic coupler 36 between the two insert sleeves 8. Subsequently, the main servo motor 10 drives the input shaft of the hydraulic coupler 36 to rotate, thereby driving the output shaft of the hydraulic coupler 36 to rotate synchronously. This, in turn, drives the speed measuring gear 7 mounted on the output shaft to rotate. Simultaneously, the magnetic speed sensor 14 detects the rotating speed measuring gear 7, thereby detecting the speed of the output shaft of the hydraulic coupler 36, and thus determining whether the transmission efficiency of the hydraulic coupler 36 is good.

[0027] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A hydraulic coupling speed detection device, comprising a detection platform (1), characterized in that: The side of the testing platform (1) is connected to a support base (3). The support base (3) is provided with a pusher. Two push rings (6) are symmetrically arranged on the pusher. The opposite surfaces of the two push rings (6) are inclined. A bushing (8) is provided in the middle of each of the two push rings (6). The notch edge of the bushing (8) is inclined. A support frame (15) is coaxially mounted on the outer surface of the bushing (8). The support frame (15) is elastically connected to the push rings (6). A speed measuring gear (7) is coaxially embedded at the end of one of the bushings (8). A magnetic speed sensor (14) is fixedly installed at the upper end of the detection platform (1). The magnetic speed sensor (14) is close to the speed measuring gear (7). A drive rod (9) is rotatably installed at the upper end of the detection platform (1). Another insert sleeve (8) is slidably installed on the outer surface of the drive rod (9). A shaft support positioning component is provided between the two push sleeves (6). The shaft support positioning component is connected to the bearing seat (3). A locking key (26) is elastically installed through the lower part of the opposite ends of the two insert sleeves (8). A ball (13) is fitted to the inner surface of the push sleeve (6). The ball (13) is connected to the locking key (26).

2. The hydraulic coupling speed detection device according to claim 1, characterized in that: The upper end of the testing platform (1) is fixedly installed with a main servo motor (10). The output end of the main servo motor (10) is fixed with the drive rod (9). The outer surface of the drive rod (9) has two symmetrically extended transmission ears (39). The outer surface of the other insert sleeve (8) is provided with an adaptation groove (38). The transmission ear (39) is slidably installed inside the adaptation groove (38).

3. The hydraulic coupling speed detection device according to claim 1, characterized in that: The lower end of the locking key (26) extends a key seat (29), and the lower end of the key seat (29) extends two slide rods (28) symmetrically. The lower ends of the two slide rods (28) are fixedly installed with connecting seats (31). The connecting seats (31) are rotatably installed on the outer surface of the ball (13). The outer surfaces of the two slide rods (28) are slidably installed with door seats (27). One end of the key seat (29) is located inside the door seat (27). The end of the door seat (27) is fixed to the insert sleeve (8). The outer side of the slide rod (28) is wound with a push key spring (30). The two ends of the push key spring (30) are fixed to the connecting seat (31) and the door seat (27) respectively. The push key spring (30) is in a tensioned state.

4. The hydraulic coupling speed detection device according to claim 1, characterized in that: The lower end of the support base (3) is fixedly installed with a display stand (2), and the end of the display stand (2) is fixed to the testing table (1).

5. The hydraulic coupling speed detection device according to claim 1, characterized in that: The push-fit component includes a threaded rod (35) rotatably mounted inside the bearing seat (3). The two ends of the threaded rod (35) extend through both sides of the bearing seat (3). The threads at both ends of the threaded rod (35) are symmetrically arranged. Both ends of the threaded rod (35) are screwed with threaded sleeves (32). The threaded sleeves (32) are located inside the bearing seat (3). The outer surfaces of the two threaded sleeves (32) each extend symmetrically with two support rings (33). The two support rings (33) extend through the front and rear ends of the bearing seat (3) respectively. The support rings (33) slide with the bearing seat (3). The support rings (33) on the two threaded sleeves (32) are fixed to the two push rings (6) respectively. A secondary servo motor (34) is connected to one side of the threaded rod (35). The secondary servo motor (34) is fixed to the detection table (1).

6. The hydraulic coupling speed detection device according to claim 1, characterized in that: Both ends of the support frame (15) are slidably mounted with support rods (18). One end of the support rod (18) is fixed to the push ring (6). A push spring (17) is wound around the outside of the support rod (18). The two ends of the push spring (17) are fixed to the support frame (15) and the other end of the support rod (18), respectively. The push spring (17) is in a tensioned state. The other end of the support rod (18) extends to a top claw (16), which abuts against the support frame (15).

7. The hydraulic coupling speed detection device according to claim 1, characterized in that: The shaft positioning component includes two guide shells (4) symmetrically arranged between two push rings (6). A guide rod (23) is slidably installed inside the guide shell (4). The guide rod (23) extends through the upper end of the guide shell (4). A positioning key (12) is fixedly installed at the upper end of the guide rod (23). Two brackets (5) are symmetrically arranged between the two guide shells (4). The brackets (5) and the guide shells (4) are both fixed to the upper end of the bearing seat (3). Two support rollers (11) are symmetrically arranged at the upper end of the brackets (5).

8. The hydraulic coupling speed detection device according to claim 7, characterized in that: The outer surface of the guide rod (23) extends with an extension ear (24), and the outer surface of the guide shell (4) is provided with a through groove (22). The extension ear (24) passes through the inside of the through groove (22) and slides with the through groove (22). A key frame (20) is rotatably installed at the end of the extension ear (24), and an ear rod (21) is rotatably installed at the end of the key frame (20). The ear rod (21) slides with the guide shell (4). A push ear (19) extends from the lower end of the push ring (6). The push ear (19) abuts against the end of the ear rod (21). A return spring (25) is fixedly installed on the inner bottom surface of the guide shell (4). The end of the return spring (25) is fixed to the lower end of the guide rod (23).

Images