A concrete quality detection device for water conservancy and hydropower engineering

Abstract

The present invention discloses a concrete quality detection device for water conservancy and hydropower engineering, which relates to the technical field of concrete quality detection. It comprises a top box, the lower end of the top box is fixedly connected to a middle box, the interior of the middle box is fixedly connected to a base frame, the upper end of the base frame is fixedly connected to a tray, and the lower end of the middle box is fixedly connected to a bottom box. Through the provided base frame and tray structure, the user can control the automatic loading and unloading detection process after preparing the concrete blocks to be tested, thereby reducing manual contact throughout the process, improving the detection efficiency, and reducing the dangers caused by accidental touch, etc. Through the provided top box component structure, it can isolate the observation window during the detection process, so that the user can get close to view the concrete test situation without being injured by splashing concrete blocks. Through the provided middle box component structure, the actual application situation under special circumstances can be simulated as needed or used to test different stress conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete quality detection, in particular to a concrete quality detection device for water conservancy and hydropower engineering. Background Art

[0002] Water conservancy and hydropower engineering mainly studies the basic knowledge and skills in water resources, hydraulic structures, hydraulics and fluid dynamics, and water conservancy engineering technology, and conducts surveying, planning, design, construction, and management of water conservancy and hydropower projects. Concrete will appear in the construction process of these projects, and there are certain requirements for parameters such as the strength of concrete during the construction of hydropower stations and dams. Therefore, concrete quality testing devices are often needed in the construction of water conservancy and hydropower projects to detect whether the concrete quality meets the standards.

[0003] The invention patent with announcement number CN117451535A discloses a concrete quality detection device for water conservancy projects. It applies lateral pressure to the concrete test block through a lateral pressure mechanism, thereby better simulating the environment in which concrete is actually used, making it more realistic and representative. When the top pressure mechanism and the bottom support mechanism are used to apply pressure to the concrete test block, the concrete test block that has been offset and deformed can be centered through the adjustable bottom support mechanism, and the top pressure mechanism ensures that the downward pressure at the two points is always equal through the pressure balancing component during the entire downward pressure process, thereby improving the accuracy and authenticity of the test.

[0004] The above-mentioned prior art parts have certain shortcomings in actual use. Although they meet the quality inspection requirements of concrete to a certain extent, the loading and unloading process still requires manual processing, resulting in a large amount of manual workload. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the present invention provides a concrete quality detection device for water conservancy and hydropower engineering, which solves the problems mentioned in the above background technology.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A concrete quality detection device for water conservancy and hydropower engineering, comprising a top box, the lower end of the top box being fixedly connected to a middle box, the interior of the middle box being fixedly connected to a bottom frame, the upper end of the bottom frame being fixedly connected to a tray, and the lower end of the middle box being fixedly connected to a bottom box;

[0008] The bottom end surface of the tray is symmetrically fixedly connected to the guide frame, the surface of the guide frame is embedded with an insert, the surface of the insert is sleeved with a connecting strip, the surface of the connecting strip is provided with a movable groove, the surface of the connecting strip is provided with a connecting hole near one end edge, the surface of the insert is fixedly connected to the mounting block, the interior of the mounting block is fixedly connected with an anti-slip rod, the surface of the anti-slip rod is sleeved with a spring, the surface of the anti-slip rod is located at the upper end of the spring and is sleeved with a pin block, the bottom end surface of the guide frame is fixedly connected to the bracket, one end surface of the bracket is fixedly connected to the motor, the output end of the motor is fixedly connected to the rotating arm, the surface of the bracket is fixedly connected with a convex node near one end edge, and the convex node is sleeved with the connecting hole.

[0009] As a further solution of the present invention: observation windows are symmetrically provided on the surface of the top box, a protective frame is provided inside the observation window, a surrounding frame is welded and fixed to the lower end of the protective frame inside the observation window, the surface of the protective frame is rotatably connected to a connecting sleeve, the surface of the connecting sleeve is rotatably connected to a folding joint, the surface of the connecting sleeve is sleeved and connected to a connecting rope, the inner side of the connecting rope is rotatably connected to a sleeve disk, the top surface of the sleeve disk is sleeved and connected to a sleeve shaft, the surface of the sleeve shaft is sleeved and connected to a fixed seat, the fixed seat is fixedly connected to the top box, a motor is provided at the bottom end of one of the sleeve disks, and the top surfaces of two of the connecting sleeves are fixedly connected to positioning joints, and the positioning joints are fixedly connected to the top box.

[0010] As a further solution of the present invention: grooves are symmetrically provided on the two short side surfaces of the middle box, and a blackout curtain is fixedly installed on the grooved surface. A first conveyor belt is fixedly installed at one end of the interior of the middle box, and a second conveyor belt is fixedly installed at the other end of the interior of the middle box. Brackets are welded and fixed at the top ends of the two long side surfaces of the middle box.

[0011] As a further solution of the present invention: the bottom end surface of the bracket is fixedly connected to the first cylinder, the output end of the first cylinder is fixedly connected to the rack, the surface of the rack is meshingly connected to the gear, the upper end of the bracket is rotatably connected to the connecting shaft, the connecting shaft is fixedly connected to the gear, one end surface of the connecting shaft is fixedly connected to the test frame, and the surface of the test frame is fixedly installed with a pressurizing machine.

[0012] As a further solution of the present invention: a second cylinder is fixedly installed on the top surface of the base frame, a guide rail is symmetrically provided on the upper end of the base frame, a guide wheel is embedded in the inner side of the guide rail, the surface of the guide wheel is rotatably connected to the folding frame, the output end of the second cylinder is rotatably connected to the linkage rod, the surface of the linkage rod is symmetrically rotatably connected to the third cylinder, and the third cylinder is rotatably connected to the folding frame.

[0013] As a further solution of the present invention: an electric turntable is embedded and connected in the middle of the surface of the tray, through grooves are symmetrically provided on the surface of the tray, a guide groove is provided on the surface of the guide frame, the embedment is embedded and connected to the guide groove, and a limiting groove is provided on the surface of the guide groove.

[0014] As a further solution of the present invention: a fan is embedded and fixed on the short side surface of the bottom box, a sieve plate is embedded and fixed on the top top surface inside the bottom box, a discharge chute is provided at one end edge of the bottom surface of the bottom box, an inclined bucket is fixedly connected to the surface of the discharge chute, and a vibrator is symmetrically fixedly connected to the bottom surface of the inclined bucket.

[0015] Beneficial effects of the present invention:

[0016] Through the provided base frame and tray structure, the user can control the automatic loading and unloading inspection process after preparing the concrete blocks to be inspected, thereby reducing manual contact throughout the process, improving inspection efficiency, and reducing the risk of accidental touch. Through the provided top box component structure, the observation window can be isolated during the inspection process, allowing the user to closely view the concrete test conditions without being injured by flying concrete blocks. Through the provided middle box component structure, the actual application conditions under special circumstances can be simulated as needed or used to test different stress conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 It is a schematic diagram of the connection structure of the top box accessories of the present invention;

[0019] Figure 3 It is a schematic diagram of the structural connection of the protective frame accessories of the present invention;

[0020] Figure 4 yes Figure 3 Enlarged view of point A in the middle;

[0021] Figure 5 This is a schematic diagram of the connection structure of the middle box accessories of the present invention;

[0022] Figure 6 This is a schematic diagram of the disassembly of the middle box accessory structure of the present invention;

[0023] Figure 7 This is a schematic diagram of the connection structure between the chassis and the tray accessories of the present invention;

[0024] Figure 8 This is a schematic diagram of the disassembled structure of the chassis accessories of the present invention;

[0025] Figure 9This is a schematic diagram of the disassembled structure of the pallet accessory of the present invention;

[0026] Figure 10 It is a schematic diagram of the disassembly of the bottom box accessory structure of the present invention.

[0027] In the figure: 1. Top box; 2. Observation window; 3. Protective frame; 4. Connecting sleeve; 5. Folding joint; 6. Connecting rope; 7. Sleeve plate; 8. Sleeve shaft; 9. Fixed seat; 10. Motor; 11. Positioning joint; 12. Middle box; 13. Slot; 14. Shielding curtain; 15. First conveyor belt; 16. Second conveyor belt; 17. Bracket; 18. First cylinder; 19. Rack; 20. Gear; 21. Coupling shaft; 22. Test stand; 23. Pressurizer; 24. Underframe; 25. Second cylinder; 26. Guide rail; 27. Guide Wheel; 28. Folding frame; 29. Linkage rod; 30. Third cylinder; 31. Pallet; 32. Electric turntable; 33. Through slot; 34. Guide frame; 35. Guide slot; 36. Limit slot; 37. Embossed block; 38. Connecting bar; 39. Movable slot; 40. Connecting hole; 41. Mounting block; 42. Anti-slip rod; 43. Spring; 44. Pin block; 45. Motor; 46. Rotating arm; 47. Convex joint; 48. Bottom box; 49. Fan; 50. Screen plate; 51. Discharge chute; 52. Inclined bucket; 53. Vibrator. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] See also Figures 1-10 As shown, the present invention is a concrete quality detection device for water conservancy and hydropower engineering, comprising a top box 1, the lower end of the top box 1 is fixedly connected to a middle box 12, the interior of the middle box 12 is fixedly connected to a bottom frame 24, the upper end of the bottom frame 24 is fixedly connected to a tray 31, and the lower end of the middle box 12 is fixedly connected to a bottom box 48;

[0030] The bottom surface of the tray 31 is symmetrically fixedly connected to a guide frame 34, and an insert 37 is embedded in the surface of the guide frame 34. The surface of the insert 37 is sleeved with a connecting bar 38. The surface of the connecting bar 38 is provided with a movable groove 39. The surface of the connecting bar 38 is provided with a connecting hole 40 near one end edge. The surface of the insert 37 is fixedly connected to a mounting block 41. The inside of the mounting block 41 is fixedly connected to an anti-slip rod 42. The surface of the anti-slip rod 42 is sleeved with a spring 43. The surface of the anti-slip rod 42 is located at the upper end of the spring 43 and is sleeved with a pin block 44. The bottom surface of the guide frame 34 is fixedly connected to a bracket, one end surface of the bracket is fixedly connected to a motor 45, the output end of the motor 45 is fixedly connected to a rotating arm 46, the surface of the bracket is fixedly connected to a convex section 47 near one end edge, and the convex section 47 is sleeved with the connecting hole 40;

[0031] The surface of the top box 1 is symmetrically provided with an observation window 2, and the inside of the observation window 2 is provided with a protective frame 3. The inside of the observation window 2 is located at the lower end of the protective frame 3 and is welded and fixed with a surrounding frame. The surface of the protective frame 3 is rotatably connected to the connecting sleeve 4, and the surface of the connecting sleeve 4 is rotatably connected to the folding section 5. The surface of the connecting sleeve 4 is sleeved and connected to the connecting rope 6, and the inner side of the connecting rope 6 is rotatably connected to the sleeve disc 7. The top surface of the sleeve disc 7 is sleeved and connected to the sleeve shaft 8, and the surface of the sleeve shaft 8 is sleeved and connected to the fixed seat 9. The fixed seat 9 is fixedly connected to the top box 1. A motor 10 is provided at the bottom end of one of the sleeve discs 7, and the top surfaces of two connecting sleeves 4 are fixedly connected to the positioning section 11, and the positioning section 11 is fixedly connected to the top box 1. During the concrete quality inspection process, when the inspector needs to observe the concrete test and other conditions nearby, the user can control the motor 10 operates, and under its driving action, the sleeve disc 7 connected to it will start to rotate, and the connecting rope 6 set on its surface will play a transmission role, thereby driving the other sleeve discs 7 to rotate together. In this process, the connecting sleeve 4 that is not connected to the positioning joint 11 will be affected by the connecting rope 6 and move continuously, and under the action of the folding joint 5, all the protective frames 3 will eventually be unfolded. At this time, the center of the protective frame 3 is lowered, causing its lower end to deflect toward the inside of the top box 1. The surrounding frame provided can play a blocking effect, and at the same time, it can also prevent impurities generated during the inspection from flying out from the gap between the protective frame 3 and the observation window 2. The tempered glass on the surface of the protective frame 3 enables the inspector to directly observe the inspection process without being affected. When the protective frame 3 needs to be retracted, it is only necessary to control the motor 10 to reverse;

[0032] The two short side surfaces of the middle box 12 are symmetrically provided with slots 13, and the surface of the slots 13 is fixedly installed with a shielding curtain 14. The interior of the middle box 12 is fixedly installed at one end with a first conveyor belt 15, and the interior of the middle box 12 is fixedly installed at the other end with a second conveyor belt 16. The two long side surfaces of the middle box 12 are welded and fixed at the top with brackets 17. After the user arranges and places multiple groups of concrete to be tested, they can be transported one by one through the first conveyor belt 15. After passing the test, the user can start the second conveyor belt 16 for transportation;

[0033] The bottom surface of the bracket 17 is fixedly connected to the first cylinder 18, and the output end of the first cylinder 18 is fixedly connected to the rack 19, and the surface of the rack 19 is meshed with the gear 20. The upper end of the bracket 17 is rotatably connected to the connecting shaft 21, and the connecting shaft 21 is fixedly connected to the gear 20. One end surface of the connecting shaft 21 is fixedly connected to the test frame 22, and the surface of the test frame 22 is fixedly installed with a pressurizing machine 23. When the inspector needs to check the fixing condition of the concrete, or needs to simulate the actual application condition at a specific angle, or to test different stress conditions, the user can control the operation of the first cylinder 18, and the rack 19 on its output end will drive the gear 20 to rotate, and then the connecting shaft 21 connected to the gear 20 will drive the entire test frame 22 to rotate a certain angle. After that, as needed, the pressurizing machine 23 can be controlled to apply a certain pressure to obtain the required test results;

[0034] A second cylinder 25 is fixedly mounted on the top surface of the bottom frame 24, and a guide rail 26 is symmetrically provided on the upper end of the bottom frame 24. A guide wheel 27 is embedded in the inner side of the guide rail 26, and a folding frame 28 is rotatably connected to the surface of the guide wheel 27. The output end of the second cylinder 25 is rotatably connected to a linkage rod 29, and the surface of the linkage rod 29 is symmetrically rotatably connected to a third cylinder 30. The third cylinder 30 is rotatably connected to the folding frame 28. In the process of controlling concrete loading and unloading, after the concrete is placed on the surface of the pallet 31, the user can drive the second cylinder 25 so that its output end pushes and pulls the linkage rod 29 to move horizontally on the surface of the bottom frame 24, and at the same time controls the third cylinder 30 to operate simultaneously, thereby cooperating with the folding frame 28 to lift and lower, providing sufficient support for it, and the folding frame 28 will also be stably folded under the action of the guide wheel 27 and the guide rail 26, while ensuring transportation efficiency, automatically completing the concrete loading and unloading operations to reduce manual workload;

[0035] The surface of the tray 31 is located in the middle and is embedded with an electric turntable 32. The surface of the tray 31 is symmetrically provided with through grooves 33. The surface of the guide frame 34 is provided with a guide groove 35. The insert 37 is embedded and connected with the guide groove 35. The surface of the guide groove 35 is provided with a limit groove 36. After the concrete inspection is completed, wait for the press 23 to be in a horizontal state and slowly stop applying pressure to the concrete. Then the concrete will fall on the surface of the tray 31 that has been raised in advance. At this time, the user can control the motor 45 to start working, and the rotating arm 46 on its output end will cooperate with the active The movable groove 39 allows the connecting bar 38 to continuously swing back and forth around the connecting hole 40, and the sleeve connection relationship between the insert 37 and the connecting bar 38 also allows the insert 37 to move freely in the guide groove 35 without being interfered with by the movement. At the same time, the mounting block 41 will also move together. According to the inclined surface of the pin block 44, when it returns to its original position, it will be blocked by the concrete and retracted into the mounting block 41. Then, after being freed from the blockage, it will re-extend with the spring 43. Then, its flush surface will push the concrete to the surface of the second conveyor belt 16, thereby completing the concrete unloading operation.

[0036] A fan 49 is embedded and fixed on the short side surface of the bottom box 48, a sieve plate 50 is embedded and fixed on the top surface of the inner side of the bottom box 48, and a discharge chute 51 is provided on the bottom surface of the bottom box 48 near one end edge. An inclined bucket 52 is fixedly connected to the surface of the discharge chute 51, and a vibrator 53 is symmetrically fixedly connected to the bottom surface of the inclined bucket 52. The dust and debris generated during the concrete testing process will fall into the bottom box 48 through the sieve plate 50. During subsequent cleaning, the user controls the fan 49 to guide the dust and debris to move toward the direction of the discharge chute 51, and then fall along the inclined bucket 52. The vibrator 53 can also be started to accelerate the cleaning.

[0037] The working principle of the present invention is as follows: during the concrete quality inspection process, when the inspection personnel need to observe the concrete test and other conditions nearby, the user can control the motor 10 to operate. Under its driving action, the sleeve disc 7 connected thereto will start to rotate, and the connecting rope 6 set on its surface will play a transmission role, thereby driving other sleeve discs 7 to rotate together. In this process, the connecting sleeve 4 that is not connected to the positioning joint 11 will be affected by the connecting rope 6 and move continuously, and under the action of the folding joint 5, all the protective frames 3 will eventually be unfolded. At this time, the protective frame 3 will be deflected to the inside of the top box 1 due to its center being lower. The provided surrounding frame can play a blocking effect and can also avoid the generation of miscellaneous items during the inspection process. The substance flies out from the gap between the protective frame 3 and the observation window 2, and the tempered glass on the surface of the protective frame 3 enables the inspector to directly observe the inspection process without being affected. When the protective frame 3 needs to be retracted, it is only necessary to control the motor 10 to reverse. When the inspector needs to check the fixation of the concrete, or needs to simulate the actual application at a specific angle, or to test different stress conditions, the user can control the first cylinder 18 to operate, and the rack 19 on its output end will drive the gear 20 to rotate, and then the connecting shaft 21 connected to the gear 20 will drive the entire test frame 22 to rotate a certain angle. After that, according to needs, the pressurizer 23 can be controlled to apply a certain pressure to obtain the required test results. In the process of controlling the loading and unloading of concrete, after the concrete is placed on the surface of the tray 31, the user can drive the second cylinder 25 so that the output end push-pull linkage rod 29 moves horizontally on the surface of the base frame 24, and at the same time control the third cylinder 30 to operate simultaneously, thereby cooperating with the folding frame 28 to lift and lower, providing sufficient support for it, and the folding frame 28 will also be stably folded under the action of the guide wheel 27 and the guide rail 26, while ensuring the transportation efficiency, the loading and unloading operations of the concrete are automatically completed to reduce the manual workload. After the concrete inspection is completed, wait for the press 23 to be in a horizontal state and slowly stop applying pressure to the concrete, and then the concrete will fall on the surface of the tray 31 that has been raised in advance. At this time, the user can control the motor 45 to start operating. The rotating arm 46 on its output end will cooperate with the movable groove 39 to make the connecting bar 38 continuously swing back and forth around the connecting hole 40 during the circular motion, and the sleeve connection relationship between the insert 37 and the connecting bar 38 will also make the insert 37 move freely in the guide groove 35 without being interfered with by the movement. At the same time, the mounting block 41 will also move together. According to the inclined surface of the pin block 44, when it returns to its position, it will be blocked by the concrete and retracted into the mounting block 41. Then, after being free from the blockage, it will re-extend with the spring 43. After that, its flush surface will push the concrete to the surface of the second conveyor belt 16, thereby completing the concrete unloading operation.

[0038] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A concrete quality detection device for water conservancy and hydropower engineering, comprising a top box (1), characterized in that: The lower end of the top box (1) is fixedly connected to the middle box (12), the interior of the middle box (12) is fixedly connected to the bottom frame (24), the upper end of the bottom frame (24) is fixedly connected to the tray (31), and the lower end of the middle box (12) is fixedly connected to the bottom box (48); The two short side surfaces of the middle box (12) are symmetrically provided with slots (13), and a shielding curtain (14) is fixedly installed on the surface of the slot (13). A first conveyor belt (15) is fixedly installed at one end of the interior of the middle box (12), and a second conveyor belt (16) is fixedly installed at the other end of the interior of the middle box (12). A bracket (17) is welded and fixed at the top of the two long side surfaces of the middle box (12), and the bottom end surface of the bracket (17) is fixedly connected to a first cylinder (18), and the output end of the first cylinder (18) is fixedly connected to a rack (19), and the surface of the rack (19) is meshed with a gear (20). The upper end of the bracket (17) is rotatably connected to a connecting shaft (21), and the connecting shaft (21) is fixedly connected to the gear (20). One end surface of the connecting shaft (21) is fixedly connected to a test stand (22), and a pressurizing machine (23) is fixedly installed on the surface of the test stand (22); The bottom surface of the tray (31) is symmetrically fixedly connected to a guide frame (34), the surface of the guide frame (34) is embedded with an insert (37), the surface of the insert (37) is sleeved with a connecting bar (38), the surface of the connecting bar (38) is provided with a movable groove (39), the surface of the connecting bar (38) is provided with a connecting hole (40) at one end edge, the surface of the insert (37) is fixedly connected to a mounting block (41), the interior of the mounting block (41) is fixedly connected to an anti-drop rod (42), and the The surface of the anti-slip rod (42) is sleeved and connected with a spring (43), the surface of the anti-slip rod (42) is sleeved and connected with a pin block (44) at the upper end of the spring (43), the bottom surface of the guide frame (34) is fixedly connected with a bracket, one end surface of the bracket is fixedly connected with a motor (45), the output end of the motor (45) is fixedly connected with a rotating arm (46), the surface of the bracket near one end edge is fixedly connected with a convex node (47), and the convex node (47) is sleeved and connected with the connecting hole (40); The surface of the top box (1) is symmetrically provided with an observation window (2), the inside of the observation window (2) is provided with a protective frame (3), the inside of the observation window (2) is welded and fixed with a surrounding frame at the lower end of the protective frame (3), the surface of the protective frame (3) is rotatably connected to a connecting sleeve (4), the surface of the connecting sleeve (4) is rotatably connected to a folding joint (5), the surface of the connecting sleeve (4) is sleeved and connected to a connecting rope (6), the inner side of the connecting rope (6) is rotatably connected to a sleeve disc (7), the top surface of the sleeve disc (7) is sleeved and connected to a sleeve shaft (8), the surface of the sleeve shaft (8) is sleeved and connected to a fixed seat (9), the fixed seat (9) is fixedly connected to the top box (1), the bottom end of one of the sleeve discs (7) is provided with a motor (10), the top surfaces of two of the connecting sleeves (4) are fixedly connected to positioning joints (11), and the positioning joints (11) are fixedly connected to the top box (1); A second cylinder (25) is fixedly mounted on the top surface of the base frame (24), a guide rail (26) is symmetrically provided on the upper end of the base frame (24), a guide wheel (27) is embedded in the inner side of the guide rail (26), and a folding frame (28) is rotatably connected to the surface of the guide wheel (27), an output end of the second cylinder (25) is rotatably connected to a linkage rod (29), and a surface of the linkage rod (29) is symmetrically rotatably connected to a third cylinder (30), and the third cylinder (30) is rotatably connected to the folding frame (28); A fan (49) is embedded and fixed on a short side surface of the bottom box (48), a screen plate (50) is embedded and fixed on the top surface of the inner side of the bottom box (48), a material discharge chute (51) is provided on the bottom surface of the bottom box (48) near one end edge, an inclined bucket (52) is fixedly connected to the surface of the material discharge chute (51), and a vibrator (53) is symmetrically fixedly connected to the bottom surface of the inclined bucket (52).

2. A concrete quality detection device for water conservancy and hydropower engineering according to claim 1, characterized in that: An electric turntable (32) is embedded and connected at the middle of the surface of the tray (31), through grooves (33) are symmetrically provided on the surface of the tray (31), a guide groove (35) is provided on the surface of the guide frame (34), the insert (37) is embedded and connected to the guide groove (35), and a limiting groove (36) is provided on the surface of the guide groove (35).

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