A conveying device for compensating the sag deformation of the conveying end by inversely adjusting the cantilever angle

Abstract

This invention relates to the field of cement conveying technology and discloses a conveying device that compensates for drooping deformation at the conveying end by adjusting the cantilever angle in the reverse direction. The invention includes a device body, a moving wheel, a variable pitch conveying assembly, an electric angle adjustment assembly, a linkage limiting assembly, and a drooping compensation assembly. During operation, after the device is moved and positioned, the variable pitch screw conveys cement to avoid blockage. The sleeve angle is adjusted by a gear ring driven by a motor, and the linkage triggers the limiting assembly of multiple elastic components to lock the posture. The compensation assembly buffers the drooping deformation of the sleeve through elastic deformation. This device improves the continuity of conveying, the suitability of the angle, and the stability of the posture.

Description

Technical Field

[0001] This invention relates to the field of cement conveying technology, and in particular to a conveying device that compensates for sagging deformation at the conveying end by adjusting the cantilever angle in the reverse direction. Background Technology

[0002] Screw conveyors are common material conveying devices widely used in industrial production. They are simple and reliable to install, and can efficiently transport granular and powdery materials from one location to another, thus playing a crucial role in the material conveying field. A screw conveyor typically consists of a helical blade and a fixed conveying pipe. The helical blade is used to transport material from one end to the other, while the conveying pipe supports and positions the helical blade. However, traditional screw conveyors have the following limitations.

[0003] Regarding the aforementioned and existing related technologies, the applicant believes that the following defects often exist: In terms of the conveying structure, most adopt a fixed pitch setting, which makes it easy for materials to accumulate and compact in the feeding area, forming blockages. This problem is more prominent for high-grade cement with a fast setting speed, seriously affecting the continuity of production. In terms of angle adjustment, traditional equipment mostly relies on manual operation, which requires disassembly and reassembly of parts. The adjustment process is cumbersome and time-consuming, and the angle accuracy is difficult to guarantee. It is impossible to quickly adapt to the docking requirements of different specifications of pipe pile molds. In terms of posture locking, the existing locking structure is not stable enough. The vibration generated by the operation of the equipment can easily cause angle deviation, which in turn affects the accuracy of material feeding. At the same time, long cantilever conveying equipment generally lacks a targeted sag compensation setting. Under the action of its own weight and the weight of the material, the cantilever is prone to end sag, which not only causes cement slurry to be spilled and wasted, but also causes defects in the quality of pipe pile casting, making it difficult to meet the requirements of efficient and high-quality production. Summary of the Invention

[0004] The technical problem to be solved by the present invention is the shortcomings of the existing conveying device that adjusts the cantilever angle in the reverse direction to compensate for the drooping deformation of the conveying end. To this end, we propose a conveying device that adjusts the cantilever angle in the reverse direction to compensate for the drooping deformation of the conveying end.

[0005] To achieve the above objectives, this application adopts the following technical solution: a conveying device for compensating for sagging deformation at the conveying end by adjusting the cantilever angle in the reverse direction, comprising a device body and a movable wheel rotatably connected to one side of the device body. A material conveying assembly is provided on one side of the device body. The material conveying assembly includes a motor I located on one side of the device body. A screw assembly is provided on the output shaft of the motor I. The screw assembly includes a small screw and a large screw located on the output shaft of the motor I. The small screw has a small pitch, and the large screw has a large pitch. A sleeve is also movably connected to the device body. The screw assembly is rotatably connected to the sleeve. A feeding port and a discharging port are provided on the surface of the sleeve. A sleeve plate is provided on the outer side of the sleeve, and connecting plates are provided on both sides of the sleeve plate. An adjustment assembly is provided on the other side of the device body. The adjustment assembly includes a fixed shell disposed on the outside of the sleeve, which is rotatably connected to the device body. A side connection assembly is provided on one side of the connecting plate, and a rotating assembly is provided on one side of the side connection assembly. The rotating assembly includes a gear ring disposed on one side of the side connection assembly, and a rotating rod is rotatably connected to the side connection assembly. A linkage plate is provided on one side of the rotating rod, and a gear is rotatably connected to the outside of the rotating rod. The gear meshes with the gear ring. A hemisphere is slidably connected to one side of the rotating rod. A moving plate is rotatably connected inside the side connection assembly, and a frame block is slidably connected inside the side connection assembly. A compensation assembly is provided on one side of the device body, and the compensation assembly is connected to the sleeve plate.

[0006] Preferably, a receiving shell is provided on the other side of the device body, and a second motor is provided inside the receiving shell. The output shaft of the second motor is connected to the adjustment component. A rotating column is provided on one side of the fixed shell, and the rotating column is rotatably connected to the device body.

[0007] Preferably, the side connection component includes an extension plate disposed on one side of the device body. The surface of the extension plate has a groove, and the interior of the extension plate has a notch. The notch is arc-shaped, and the interior of the extension plate also has slots. Multiple sets of slots are equally spaced.

[0008] Preferably, a slider is slidably connected inside the notch, a sleeve is provided on one side of the slider, the sleeve is connected to the rotating rod, and the sleeve is connected to the hemisphere.

[0009] Preferably, the side connection component is provided with a limiting component inside. The limiting component includes a protrusion slidably connected inside the slot. A tension spring is provided on one side of the protrusion and is connected to the slot.

[0010] Preferably, a pressure block is provided on one side of the protrusion, and a convex ball is provided on the other side of the pressure block, with the convex ball and the hemisphere having a contact and compression portion.

[0011] Preferably, a rotating rod is rotatably connected inside the slot, the rotating rod is connected to the moving plate, and a spring is provided between the rotating rod and the slot.

[0012] Preferably, one end of the movable plate is provided with a compression ball, a rectangular block is slidably connected inside the slot, and a spring is provided on one side of the rectangular block, the spring being connected to the slot.

[0013] Preferably, a driven block is provided on one side of the rectangular block, the driven block is connected to the frame block, and the frame block is magnetically fixed to the sleeve block.

[0014] Preferably, the compensation component includes a horizontal plate disposed on one side of the device body, the surface of the horizontal plate having a groove, a connecting seat slidably connected to one side of the groove, a swing rod rotatably connected to one side of the connecting seat, an external block disposed on one side of the swing rod, a second spring disposed on one side of the external block, and a movable seat disposed on one side of the second spring, the movable seat being connected to the sleeve plate.

[0015] The technical effects and advantages of this invention are as follows: In this invention, the small pitch of the small screw buffers the instantaneous flow rate of material at the inlet, preventing high-grade cement from accumulating and compacting in the feeding area. The large pitch of the large screw expands the storage capacity of the conveying section, enabling rapid delivery of material from the downstream section to the outlet, thus solving the problem of dead zone blockage. The reduced pipe blockage and lower cleaning time ensure continuous cement slurry delivery and a more stable pouring rhythm for pipe pile production. Traditional manual adjustments require disassembly and reassembly of components, resulting in lengthy adjustments. This device's motor-driven structure allows for rapid angle switching with less adjustment error and a closer fit between the discharge port and the mold. During station switching, production interruptions are reduced. The sleeve experiences more even force during adjustment, reducing deformation and minimizing equipment maintenance and replacement. Vibration during conveyor operation can cause angle shifts in traditional locking structures. This device's limiting components create a stable engagement through interlocking parts. During vibration, the compressive force on related components increases, resulting in more stable limiting. The sleeve's angle does not shift significantly after continuous material delivery, leading to better cement discharge, reduced quality issues during pipe pile pouring, and less frequent rework. The simple structure of the limiting components requires minimal maintenance and low inspection frequency.

[0016] When the sleeve cantilever is long, traditional equipment will sag at the end due to the weight of itself and the material. The spring deformation of this device can provide reverse support, reducing the degree of sag. At the same time, the swing and sliding of related components can match the angle change of the sleeve without jamming. The preload of the spring can also help maintain the adjusted angle, reduce the deviation caused by vibration, reduce material spillage at the discharge port, save cement raw materials, make the slurry more uniform during transportation, and make the quality of the finished pipe pile more stable, meeting the acceptance requirements of the project and improving the market acceptance of the product. Attached Figure Description

[0017] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts: Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the overall three-dimensional side view structure of the present invention; Figure 3 This is a three-dimensional cross-sectional view of the material conveying assembly of the present invention; Figure 4 This is a three-dimensional structural schematic diagram of the material conveying assembly, the adjusting assembly, and the compensation assembly of the present invention; Figure 5 This is a three-dimensional structural schematic diagram of the material conveying assembly and the adjusting assembly of the present invention; Figure 6 This is a three-dimensional structural diagram of the side-connecting component, rotating component, and limiting component of the present invention; Figure 7 This is a top view of the rotating assembly and the limiting assembly of the present invention; Figure 8 This is a three-dimensional unfolded structural diagram of the rotating component and the limiting component of the present invention; Figure 9 This is a three-dimensional structural schematic diagram of the compensation component of the present invention.

[0018] Legend: 1. Device body; 2. Moving wheel; 3. Material conveying assembly; 31. Motor 1; 32. Screw assembly; 321. Small screw; 322. Large screw; 33. Feed port; 34. Discharge port; 35. Sleeve; 36. Sleeve plate; 37. Connecting plate; 4. Adjusting assembly; 41. Receiving shell; 42. Motor 2; 43. Fixed shell; 44. Rotating column; 45. Side connection assembly; 451. Extension plate; 452. Groove; 453. Notch; 454. Slot; 46. Rotating assembly; 461. Gear ring; 462. Gear; 463. Rotating rod; 464. Linkage plate; 465. Sleeve block; 466. Slider; 467. Hemisphere; 47. Limiting component; 471. Protrusion; 472. Pressing block; 473. Protruding ball; 474. Moving plate; 475. Rotating rod; 476. Spring; 477. Extrusion ball; 478. Rectangular block; 479. Spring 1; 4710. Driven block; 4711. Frame block; 5. Compensation component; 51. Horizontal plate; 52. Slide groove; 53. Connecting seat; 54. Swing rod; 55. External block; 56. Spring 2; 57. Movable seat. Detailed Implementation

[0019] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0020] Reference Figures 1-9As shown, the present invention provides a technical solution: a conveying device for compensating for sagging deformation of the conveying end by adjusting the cantilever angle in the reverse direction, comprising a device body 1, a movable wheel 2 rotatably connected to one side of the device body 1, a material conveying assembly 3 disposed on one side of the device body 1, the material conveying assembly 3 including a motor 31 disposed on one side of the device body 1, a screw assembly 32 disposed on the output shaft of the motor 31, the screw assembly 32 including a small screw 321 and a large screw 322 disposed on the output shaft of the motor 31, the small screw 321 having a small pitch and the large screw 322 having a large pitch, a sleeve 35 movably connected to the device body 1, the screw assembly 32 being rotatably connected to the sleeve 35, the surface of the sleeve 35 having a feeding port 33 and a discharging port 34, a sleeve plate 36 disposed on the outer side of the sleeve 35, connecting plates 37 disposed on both sides of the sleeve plate 36, an adjusting assembly 4 disposed on the other side of the device body 1, the adjusting assembly 4 including a material conveying assembly 32 rotatably connected to the sleeve 35, ... and an adjusting assembly 4 disposed on the other side of the device body 1, the adjusting assembly 4 including a material conveying assembly 3 A fixed shell 43 is located outside the sleeve 35 and is rotatably connected to the device body 1. A side connection component 45 is provided on one side of the connecting plate 37, and a rotating component 46 is provided on one side of the side connection component 45. The rotating component 46 includes a gear ring 461 provided on one side of the side connection component 45. A rotating rod 463 is rotatably connected to the side connection component 45. A linkage plate 464 is provided on one side of the rotating rod 463. A gear 462 is rotatably connected to the outside of the rotating rod 463 and meshes with the gear ring 461. A hemisphere 467 is slidably connected to one side of the rotating rod 463. A moving plate 474 is rotatably connected inside the side connection component 45, and a frame block 4711 is slidably connected inside the side connection component 45. A compensation component 5 is provided on one side of the device body 1 and is connected to the sleeve 36 to reduce the angular deviation caused by equipment vibration and ultimately achieve elastic compensation for the drooping deformation of the conveying end.

[0021] Reference Figures 1-9 As shown in this embodiment: a receiving shell 41 is provided on the other side of the device body 1. A second motor 42 is provided inside the receiving shell 41. The output shaft of the second motor 42 is connected to the adjustment component 4. A rotating column 44 is provided on one side of the fixed shell 43. The rotating column 44 is rotatably connected to the device body 1. The side connection component 45 includes an extension plate 451 provided on one side of the device body 1. A groove 452 is provided on the surface of the extension plate 451. A notch 453 is provided inside the extension plate 451. The notch 453 is arc-shaped. A slot 454 is also provided inside the extension plate 451. Multiple sets of slots 454 are provided at equal intervals. A slider 466 is slidably connected inside the notch 453. A sleeve block 465 is provided on one side of the slider 466. The sleeve block 465 is connected to the rotating rod 463. The sleeve block 465 is connected to the hemisphere 467 to achieve stable adjustment of the sleeve angle 35.

[0022] The side-connecting component 45 is internally provided with a limiting component 47. The limiting component 47 includes a protrusion 471 slidably connected inside the slot 454. A tension spring is provided on one side of the protrusion 471 and connected to the slot 454. A pressure block 472 is provided on one side of the protrusion 471, and a convex ball 473 is provided on the other side of the pressure block 472. The convex ball 473 has a contact and pressing part with the hemisphere 467. A rotating rod 475 is rotatably connected inside the slot 454 and is connected to the moving plate 474. The rotating rod 475 and the slot 454 are connected to each other. A spring 476 is provided between 54. A compression ball 477 is provided at one end of the moving plate 474. A rectangular block 478 is slidably connected inside the slot 454. A spring 479 is provided on one side of the rectangular block 478 and is connected to the slot 454. A driven block 4710 is provided on one side of the rectangular block 478 and is connected to the frame block 4711. The frame block 4711 is magnetically fixed to the sleeve block 465, thereby limiting the sleeve 35 after the angle adjustment is completed and preventing it from shifting during the material conveying process.

[0023] The compensation component 5 includes a horizontal plate 51 disposed on one side of the device body 1. A groove 52 is provided on the surface of the horizontal plate 51. A connecting seat 53 is slidably connected to one side of the groove 52. A swing rod 54 is rotatably connected to one side of the connecting seat 53. An external block 55 is provided on one side of the swing rod 54. A second spring 56 is provided on one side of the external block 55. A movable seat 57 is provided on one side of the second spring 56. The movable seat 57 is connected to the sleeve plate 36 to reduce the angular deviation caused by equipment vibration and ultimately achieve elastic compensation for the drooping deformation of the conveying end.

[0024] Working principle: The operator moves the device body 1 to a suitable position using the moving wheels 2 on both sides. The mixed cement slurry is fed into the sleeve 35 through the feed port 33. Then, the drive motor 31 drives the screw assembly 32 at the output end to rotate. The screw assembly 32 consists of a small screw 321 and a large screw 322. The small screw 321 has a small pitch, and the large screw 322 has a large pitch. Driven by the motor 31, the mixed cement slurry is conveyed inside the sleeve 35 and then delivered to a suitable position through the discharge port 34. The small pitch of the small screw 321 can buffer the material flow at the feed port and prevent the material from accumulating instantly. The large pitch of the large screw 322 can expand the storage volume and speed up the conveying speed, adapting to the rapid solidification characteristics of high-grade cement, reducing the risk of pipeline blockage, improving the continuity of cement slurry conveying, and reducing the maintenance cost of cleaning the pipeline. When the angle of the feeding assembly 3 needs to be adjusted, the motor 42, which is fixed inside the housing 41 on one side of the device body 1, drives the fixed housing 43 of the output shaft to rotate. The fixed housing 43 is fixed to the sleeve 35, and a rotating column 44 is provided on one side of the sleeve 35. The rotating column 44 is rotatably connected to the device body 1. The motor 42 drives the rotating column 44 on one side of the fixed housing 43 to rotate, so that the fixed housing 43 can drive the sleeve 35 to rotate and adjust the angle. In addition, a sleeve plate 36 is provided on the outside of the sleeve 35. There are two sets of sleeve plates 36 symmetrically distributed about the fixed housing 43. Each side of the two sets of sleeve plates 36 is provided with a connecting plate 37. There are four sets of connecting plates 37 evenly distributed. The connecting plates 37 are connected to the linkage plate 464. The sleeve 35 adjusts its angle as driven by the motor 42, and the linkage plate 464 drives the rotating rod. The sleeve block 465 on one side of 463 moves in an arc shape, and the sleeve block 465 drives the sliders 466 on both sides to slide and connect with the notch 453. The rotating rod 463 drives the outer gear 462 to mesh and connect with the gear ring 461. The gear ring 461 connects with the groove 452. The sleeve block 465 drives the hemisphere 467 on one side to move in an arc shape. The gear ring 461 is distributed in a mirror image about the fixed shell 43, so the sleeve 35 rotates around the motor 42 to adjust the angle. The hemisphere 467 drives the side connecting component 45 to move in an arc shape to match. The hemisphere 467 slides and connects with the notch 453 to achieve stable adjustment of the angle of the sleeve 35. The rotating column 44 assists in supporting the sleeve 35, improving the structural rigidity during the adjustment process. The symmetrically distributed sleeve plate 36 and connecting plate 37 ensure uniform force distribution, adapt to pipe pile molds of different heights and angles, enhance the adaptability of the equipment to working conditions, and reduce production interruption time. The extension plate 451 has multiple equally spaced slots 454 inside, and a limit component 47 is installed inside the slot 454. Due to the contact and compression distribution between the convex ball 473 and the hemisphere 467, the hemisphere 467 moves to compress the convex ball 473. The convex ball 473 drives the pressure block 472 to move. The pressure block 472 drives the protrusions 471 on both sides to slide and connect with the slots 454. The protrusions 471 drive the tension spring to stretch and store force. The pressure block 472 compresses one end of the moving plate 474, thereby the moving plate 474 drives the rotating rod 475 to rotate. The rotating rod 475 is inclined, and the end of the rotating rod 475 away from the pressure block 472 is close to the driven block 4710. The rotating rod 475 drives the generator... The rotating strip 476 stores energy, and the moving plate 474 drives the extrusion ball 477 at one end to push one end of the driven block 4710. The driven block 4710 drives the rectangular block 478 to slide and connect with the slot 454. The rectangular block 478 drives the spring 479 on one side to stretch and store energy. The driven block 4710 drives the frame block 4711 on one side to engage and limit the sleeve block 465 and the slider 466, thereby limiting the sleeve 35 after the angle adjustment is completed, and preventing it from deviating during the material conveying process. The limiting force automatically increases with the vibration of the equipment, ensuring the posture stability of the sleeve under the vibration condition of material conveying, improving the accuracy of cement slurry feeding, and reducing raw material spillage and quality defects in pipe pile pouring. When the sleeve 35 droops and deforms at the conveying end due to excessive cantilever length, material weight, or operating vibration, the sleeve 35 will cause the outer sleeve plate 36 to shift its posture synchronously. The movable seat 57 connected to the sleeve plate 36 moves with the sleeve plate 36, thereby applying tension to the second spring 56, causing the second spring 56 to undergo elastic deformation. Its elastic force will form a reverse support force on the movable seat 57, initially buffering the impact force of the drooping.

[0025] Meanwhile, the movement of the movable seat 57 will cause the swing arm 54 to swing around the rotation point of the connecting seat 53. An external block 55 is provided on the outside of the swing arm 54, and the connecting seat 53 can slide adaptively along the slide groove 52 of the horizontal plate 51, which can adapt to the posture changes when the sleeve 35 is adjusted, and avoid jamming between the compensation component 5 and the sleeve 35. The preload of the second spring 56 can also help maintain the angle of the sleeve 35 after it has been adjusted by the adjustment component 4, reduce the angle deviation caused by equipment vibration, and finally realize elastic compensation for the drooping deformation of the conveying end, and improve the conveying stability of the sleeve 35.

[0026] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A conveying device for compensating for sagging deformation at the conveying end by adjusting the cantilever angle in the reverse direction, characterized in that, The device includes a main body and a movable wheel rotatably connected to one side of the main body. A material conveying assembly is located on one side of the main body. The material conveying assembly includes a motor located on one side of the main body. A screw assembly is located on the output shaft of the motor. The screw assembly includes a small screw and a large screw located on the output shaft of the motor. The small screw has a small pitch, and the large screw has a large pitch. A sleeve is also movably connected to the main body. The screw assembly is rotatably connected to the sleeve. A feed port and a discharge port are provided on the surface of the sleeve. A sleeve plate is located on the outer side of the sleeve. Connecting plates are located on both sides of the sleeve plate. An adjusting assembly is located on the other side of the main body. The adjusting assembly includes... The device includes a fixed shell disposed on the outside of the sleeve, the fixed shell being rotatably connected to the device body. A side connection assembly is disposed on one side of the connecting plate, and a rotating assembly is disposed on one side of the side connection assembly. The rotating assembly includes a gear ring disposed on one side of the side connection assembly, a rotating rod being rotatably connected to the side connection assembly, a linkage plate being disposed on one side of the rotating rod, a gear being rotatably connected to the outside of the rotating rod, the gear meshing with the gear ring, a hemisphere being slidably connected to one side of the rotating rod, a movable plate being rotatably connected inside the side connection assembly, a frame block being slidably connected inside the side connection assembly, and a compensation assembly being disposed on one side of the device body, the compensation assembly being connected to the sleeve plate.

2. The conveying device for compensating for sagging deformation at the conveying end by adjusting the cantilever angle in the reverse direction according to claim 1, characterized in that: A receiving shell is provided on the other side of the device body. A second motor is provided inside the receiving shell. The output shaft of the second motor is connected to the adjustment component. A rotating column is provided on one side of the fixed shell. The rotating column is rotatably connected to the device body.

3. The conveying device for compensating for sagging deformation at the conveying end by adjusting the cantilever angle in reverse according to claim 1, characterized in that: The side connection component includes an extension plate disposed on one side of the device body. The surface of the extension plate has a groove, and the interior of the extension plate has a notch. The notch is arc-shaped, and the interior of the extension plate also has slots. Multiple sets of slots are equally spaced.

4. The conveying device for compensating for sagging deformation at the conveying end by adjusting the cantilever angle in reverse according to claim 3, characterized in that: A slider is slidably connected inside the notch, and a sleeve is provided on one side of the slider. The sleeve is connected to the rotating rod and the sleeve is connected to the hemisphere.

5. The conveying device for compensating for sagging deformation at the conveying end by adjusting the cantilever angle in the reverse direction according to claim 4, characterized in that: The side connection component is provided with a limiting component inside. The limiting component includes a protrusion that is slidably connected inside the slot. A tension spring is provided on one side of the protrusion and is connected to the slot.

6. The conveying device for compensating for sagging deformation at the conveying end by adjusting the cantilever angle in reverse according to claim 5, characterized in that: A pressure block is provided on one side of the protrusion, and a convex ball is provided on the other side of the pressure block. The convex ball and the hemisphere have a contact and compression portion.

7. The conveying device for compensating for sagging deformation at the conveying end by adjusting the cantilever angle in reverse according to claim 6, characterized in that: A rotating rod is rotatably connected inside the slot, the rotating rod is connected to the moving plate, and a spring is provided between the rotating rod and the slot.

8. The conveying device for compensating for sagging deformation at the conveying end by adjusting the cantilever angle in reverse according to claim 7, characterized in that: One end of the movable plate is provided with a compression ball, and a rectangular block is slidably connected inside the slot. A spring is provided on one side of the rectangular block and the spring is connected to the slot.

9. The conveying device for compensating for sagging deformation at the conveying end by adjusting the cantilever angle in the reverse direction according to claim 8, characterized in that: A driven block is provided on one side of the rectangular block. The driven block is connected to the frame block, and the frame block is magnetically fixed to the sleeve block.

10. The conveying device for compensating for sagging deformation at the conveying end by adjusting the cantilever angle in the reverse direction according to claim 1, characterized in that: The compensation component includes a horizontal plate disposed on one side of the device body. A groove is formed on the surface of the horizontal plate. A connecting seat is slidably connected to one side of the groove. A swing rod is rotatably connected to one side of the connecting seat. An external block is disposed on one side of the swing rod. A second spring is disposed on one side of the external block. A movable seat is disposed on one side of the second spring. The movable seat is connected to the sleeve plate.

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