Carton stacking equipment

Abstract

The utility model discloses carton stacking equipment which comprises a base, a stacking mechanism is arranged on the base, the stacking mechanism comprises a conveying mechanism, an air cylinder, a base plate, a positioning rod and a baffle, the conveying mechanism is arranged on one side of the base, the air cylinder is installed on the base, the base plate is installed at the telescopic end of the air cylinder, and the positioning rod is installed on the base. The positioning rod is installed on the base plate through the quick fixing mechanism, the baffles are installed on the two sides of the base, the quick fixing mechanism comprises multiple sets of fixing rods, fixing sleeves, sliding holes, arc-shaped rods, a top plate, clamping blocks, clamping grooves and locking sleeves, the fixing rods are installed on the base plate, the fixing rods are sleeved with the fixing sleeves, and the top ends of the fixing sleeves are fixedly connected with the positioning rod; the multiple sets of sliding holes are distributed in the outer side of the fixing sleeve, and the arc-shaped rods are installed in the multiple sets of sliding holes in a sliding mode, so that the technical problems that in the background technology, carton boxes of different specifications and sizes are difficult to adapt, and a positioning structure of a rapid conversion mechanism is lacked are solved.

Description

Technical Field

[0001] This utility model relates to the field of logistics and transportation technology, and more specifically, it relates to a cardboard box stacking device. Background Technology

[0002] In modern industrial production and logistics transportation, cardboard box stacking equipment plays a crucial role. However, many stacking equipment on the market currently suffer from a common problem: they are difficult to adapt to cardboard boxes of different sizes. This limitation seriously affects production efficiency and flexibility. Traditional equipment can usually only handle cardboard boxes of fixed sizes. When it is necessary to stack cardboard boxes of different sizes, it is often necessary to replace the entire set of equipment or make cumbersome adjustments. This not only increases production costs but also greatly reduces the efficiency of the production line. In addition, this limits the ability of enterprises to respond quickly to market demands. In today's fast-paced and ever-changing market environment, this is undoubtedly a serious defect.

[0003] Another common problem is the lack of flexibility in the design of the positioning structure. Although many existing stacking equipment are equipped with positioning structures, these structures are often difficult to adjust or replace quickly. As a key component to ensure accurate positioning and stable stacking of cartons, the installation and adjustment of the positioning rod is often time-consuming and labor-intensive. Operators may need to use tools for tedious disassembly and installation, which not only reduces production efficiency but also increases operational complexity. This design is particularly inconvenient in production environments that require frequent switching between different sizes of cartons. The lack of a quick conversion mechanism for the positioning structure severely restricts the adaptability of the equipment and the overall efficiency of the production line, while also increasing the workload and error risk of operators. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] In view of the problems existing in the prior art, this utility model provides a carton stacking device to solve the technical problems mentioned in the background art, such as the difficulty in adapting to cartons of different sizes and the lack of a positioning structure with a rapid conversion mechanism.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a carton stacking device, including a base, on which a stacking mechanism is provided. The stacking mechanism includes a conveying mechanism, a cylinder, a pad, a positioning rod, and a baffle. The conveying mechanism is located on one side of the base. The cylinder is mounted on the base. The pad is mounted on the telescopic end of the cylinder. The positioning rod is mounted on the pad via a quick-fixing mechanism. The baffle is mounted on both sides of the base. The quick-fixing mechanism includes a fixing rod, a fixing sleeve, sliding holes, an arc-shaped rod, a top plate, a locking block, a locking groove, and a locking sleeve. Multiple sets of fixing rods are mounted on the pad. The fixing sleeve is sleeved on the fixing rod and its top end is fixedly connected to the positioning rod. Multiple sets of sliding holes are distributed on the outside of the fixing sleeve. The arc-shaped rod is slidably installed in the multiple sets of sliding holes. The top plate is located inside the fixing sleeve. The locking block is installed at the bottom end of the multiple sets of arc-shaped rods. The locking groove is located on the outer wall of the fixing rod and its number is adapted to the multiple sets of locking blocks. The locking sleeve is slidably installed on the outer wall of the fixing sleeve.

[0007] The present invention is further configured such that the conveying mechanism includes a side plate, an adjustable support foot, and a conveying roller. The side plate is installed on the outside of the two sets of baffles. Multiple sets of the adjustable support foot are installed on the bottom surface of the side plate. Multiple sets of the conveying roller are installed between the two sets of side plates and connected to an external transmission structure. This design allows for flexible adjustment of the conveying height to adapt to different production needs, while ensuring stable and efficient carton conveying.

[0008] The present invention is further configured such that the outer wall of the fixing rod is provided with a limiting strip, and multiple sets of the limiting strip are provided; the inner wall of the fixing sleeve is provided with a limiting groove, and multiple sets of the limiting groove are provided and adapted to multiple sets of the limiting strip. This design ensures the accurate positioning of the fixing sleeve on the fixing rod and improves the installation accuracy and stability.

[0009] The present invention is further configured such that each of the multiple sets of sliding holes is provided with a sliding groove, and each of the multiple sets of arc-shaped rods is provided with a sliding strip on its outer wall. The multiple sets of sliding grooves and the multiple sets of sliding strips are slidably connected. This design ensures the smooth movement of the arc-shaped rod and improves the smoothness and reliability of the operation.

[0010] The present invention is further configured such that a top spring is provided between the top plate and the inner top surface of the fixed sleeve, a push block is provided at the top of each of the multiple sets of arc-shaped rods, the multiple sets of push blocks are all spherical, and a compression spring is provided between each of the multiple sets of push blocks and the inner wall of the fixed sleeve. This elastic design enhances the stability and reliability of the locking mechanism, while providing a certain buffering effect.

[0011] The present invention is further configured such that each of the multiple sets of arc-shaped rods is provided with a locking groove, and the multiple sets of locking grooves are adapted to the locking sleeve. This design realizes a fast and reliable locking function, and improves operating efficiency and safety.

[0012] The present invention is further configured such that a limiting mechanism is provided on the outer side of the fixed sleeve. The limiting mechanism includes a vertical rod, a locking hole, a limiting sleeve, and a locking rod. Multiple sets of vertical rods are installed at the bottom end of the locking sleeve. Multiple sets of locking holes are provided and distributed at the bottom ends of multiple sets of vertical rods. The limiting sleeve is rotatably installed at the bottom end of the fixed sleeve. Multiple sets of locking rods are installed on the limiting sleeve. This design provides additional safety protection, prevents the locking sleeve from loosening accidentally, and enhances the stability of the entire device.

[0013] The present invention is further configured such that the fixed sleeve is provided with a positioning groove, and multiple sets of positioning grooves are provided; the limiting sleeve is provided with a positioning block, and multiple sets of positioning blocks are provided, with a push spring connected between the top end and the limiting sleeve. This design further enhances the stability of the limiting sleeve, prevents micro-vibration and accidental movement, and improves the reliability of the entire limiting mechanism.

[0014] (III) Beneficial Effects

[0015] Compared with the prior art, the present invention provides a cardboard box stacking device, which has the following beneficial effects:

[0016] 1. Benefits of the stacking mechanism: This mechanism achieves efficient carton stacking through a conveyor, cylinder, pad, positioning rod, and baffle mounted on the base. The conveyor can accurately transport the carton to the designated position. The combination of the cylinder and pad allows for flexible adjustment of the stacking height to accommodate different carton sizes. The positioning rod and baffle ensure accurate positioning and stability of the carton during stacking. The design of the side plates and adjustable feet allows for fine-tuning of the height and angle of the conveyor, further improving stacking accuracy. The multiple sets of conveyor rollers and the connection to the external transmission structure enable continuous and stable carton transport. The overall design greatly improves stacking efficiency and accuracy.

[0017] 2. Benefits of the Quick-Fixing Mechanism: This mechanism, through the ingenious cooperation of components such as the fixing rod, fixing sleeve, sliding hole, arc rod, top plate, locking block, locking groove, and locking sleeve, enables the rapid installation and disassembly of the positioning rod. The design of the fixing rod and fixing sleeve allows for flexible adjustment of the positioning rod's position according to the carton specifications. The cooperation of the limiting strip and limiting groove ensures the accurate positioning of the fixing sleeve on the fixing rod. The design of the sliding hole, arc rod, and locking block enables a quick locking function. The setting of the top plate, push block, and various springs enhances the stability and reliability of the locking. The sliding design of the locking sleeve further strengthens the fixing effect. The cooperation of the sliding groove and sliding strip ensures the smooth movement of the arc rod. The entire mechanism is ingeniously designed, easy to operate, and greatly improves the efficiency and stability of the positioning rod installation.

[0018] 3. Beneficial Effects of the Limiting Mechanism: This mechanism, through the design of the vertical rod, locking hole, limiting sleeve, and locking rod, provides additional safety for the quick-locking mechanism. The vertical rod and locking hole provide a precise insertion point for the locking rod. The rotational design of the limiting sleeve makes the locking process simple and quick. The multiple sets of locking rods enhance the reliability of the limit. The cooperation between the positioning groove and the positioning block further improves the stability of the limiting sleeve. The push spring ensures that the positioning block can always maintain appropriate pressure, preventing the limiting sleeve from experiencing micro-vibrations or accidental loosening. The entire limiting mechanism is reasonably designed, easy to operate, and effectively prevents accidental loosening of the quick-locking mechanism during use, greatly improving the safety and reliability of the entire stacking equipment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a cardboard box stacking device according to the present invention;

[0020] Figure 2 In this utility model Figure 1 A magnified structural diagram of the middle section;

[0021] Figure 3 This is a cross-sectional structural diagram of the quick-fix mechanism in this utility model;

[0022] Figure 4 This is a cross-sectional view of the fixing sleeve in this utility model;

[0023] Figure 5 This is a schematic diagram of the limiting mechanism in this utility model.

[0024] In the diagram: 1. Base; 2. Cylinder; 3. Pad; 4. Positioning rod; 5. Baffle; 6. Fixing rod; 7. Fixing sleeve; 8. Sliding hole; 9. Arc rod; 10. Top plate; 11. Locking block; 12. Locking groove; 13. Locking sleeve; 14. Side plate; 15. Adjustable support foot; 16. Conveying roller; 17. Limiting strip; 18. Limiting groove; 19. Sliding groove; 20. Sliding bar; 21. Top spring; 22. Push block; 23. Compression spring; 24. Locking groove; 25. Vertical rod; 26. Locking hole; 27. Limiting sleeve; 28. Locking rod; 29. ​​Positioning groove; 30. Positioning block; 31. Push spring. Detailed Implementation

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0027] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0028] Please see Figures 1-5 A cardboard box stacking device includes a base 1, on which a stacking mechanism is mounted. The stacking mechanism includes a conveying mechanism, a cylinder 2, a pad 3, a positioning rod 4, and a baffle 5. The conveying mechanism is located on one side of the base 1. The cylinder 2 is mounted on the base 1. The pad 3 is mounted on the telescopic end of the cylinder 2. The positioning rod 4 is mounted on the pad 3 via a quick-release mechanism. The baffle 5 is mounted on both sides of the base 1. The quick-release mechanism includes a fixing rod 6, a fixing sleeve 7, a sliding hole 8, an arc-shaped rod 9, a top plate 10, and a locking block 1. 1. The slot 12 and the locking sleeve 13 are provided. The fixing rod 6 is provided with multiple sets installed on the pad 3. The fixing sleeve 7 is sleeved on the fixing rod 6 and the top end is fixedly connected to the positioning rod 4. The sliding hole 8 is provided with multiple sets distributed on the outside of the fixing sleeve 7. The arc rod 9 is slidably installed in the multiple sets of sliding holes 8. The top plate 10 is set in the fixing sleeve 7. The locking block 11 is installed at the bottom end of the multiple sets of arc rods 9. The slot 12 is set on the outer wall of the fixing rod 6 and the number is adapted to the multiple sets of locking blocks 11. The locking sleeve 13 is slidably installed on the outer wall of the fixing sleeve 7.

[0029] The conveying mechanism includes side plates 14, adjustable feet 15, and conveying rollers 16. The side plates 14 are mounted on the outside of two sets of baffles 5. Multiple sets of adjustable feet 15 are mounted on the bottom surface of the side plates 14. Multiple sets of conveying rollers 16 are mounted between the two sets of side plates 14 and connected to an external transmission structure. The side plates 14, mounted on the outside of the baffles 5, provide support for the conveying rollers 16. The adjustable feet 15, mounted on the bottom surface of the side plates 14, are used to adjust the height. Multiple sets of conveying rollers 16 are mounted between the two side plates 14 and connected to the external transmission structure to realize the conveying of cartons.

[0030] The outer wall of the fixing rod 6 is provided with a limiting strip 17, and multiple sets of the limiting strip 17 are provided. The inner wall of the fixing sleeve 7 is provided with a limiting groove 18, and multiple sets of the limiting groove 18 are provided and are adapted to multiple sets of limiting strips 17. When the fixing sleeve 7 is fitted on the fixing rod 6, the limiting strip 17 and the limiting groove 18 cooperate with each other.

[0031] Each of the multiple sets of sliding holes 8 is provided with a sliding groove 19, and each of the multiple sets of arc-shaped rods 9 is provided with a sliding strip 20 on its outer wall. The multiple sets of sliding grooves 19 and multiple sets of sliding strips 20 are slidably connected, and the sliding grooves 19 and sliding strips 20 cooperate with each other to realize the sliding of the arc-shaped rod 9 in the sliding hole 8.

[0032] A top spring 21 is provided between the top plate 10 and the inner top surface of the fixed sleeve 7. Each of the multiple sets of arc rods 9 has a push block 22 at its top. Each of the multiple sets of push blocks 22 is spherical. Each of the multiple sets of push blocks 22 is connected to the inner wall of the fixed sleeve 7 with a compression spring 23.

[0033] Each of the multiple sets of arc-shaped rods 9 is provided with a locking groove 24. The multiple sets of locking grooves 24 are adapted to the locking sleeve 13. When the locking sleeve 13 slides into place, it will engage with the locking groove 24.

[0034] In this embodiment, the height or angle of the side plate 14 and the conveyor roller 16 is adjusted by adjusting the support leg 15. Multiple sets of conveyor rollers 16 are driven by an external transmission structure to convey the cartons. The extension and retraction end of the control cylinder 2 drives the pad 3 to rise or fall, adjusting the stacking height of the cartons. Then, the positioning rod 4 is installed according to the size specifications of the cartons. The fixing sleeve 7 is fitted onto the fixing rod 6 at the designated position. The limiting strip 17 on the outer wall of the fixing rod 6 is aligned with and inserted into the limiting groove 18 on the inner wall of the fixing sleeve 7, so that the top of the fixing rod 6 is aligned with the top plate 10. As the top plate 10 moves upward, it presses against the top spring 21, simultaneously pushing multiple sets of push blocks 22 and pressing against the compression springs 23. The push blocks 22 push the arc-shaped rods 9 to slide along the sliding holes 8, causing the bottom locking block 11 to engage with the locking groove 12 on the outer wall of the fixed rod 6. Then, the sliding locking sleeve 13 engages with the locking grooves 24 on the multiple sets of arc-shaped rods 9, locking them in place. At the same time, the top spring 21 and the multiple sets of compression springs 23 apply reverse pressure to the fixed rod 6 through their reset, resulting in a better engagement effect. Finally, the locking sleeve 13 is fixed by the limiting mechanism. This completes the rapid installation of the positioning rods 4. The cartons are then transported to the multiple sets of positioning rods 4 on the pad plate 3 by the conveyor roller 16 for stacking, and the carton stack is limited by the baffle 5.

[0035] Please see Figures 4-5 As one implementation of the limiting mechanism: a limiting mechanism is provided on the outside of the fixed sleeve 7. The limiting mechanism includes a vertical rod 25, a locking hole 26, a limiting sleeve 27 and a locking rod 28. Multiple sets of vertical rods 25 are installed at the bottom of the locking sleeve 13. Multiple sets of locking holes 26 are provided and distributed at the bottom of multiple sets of vertical rods 25. The limiting sleeve 27 is rotatably installed at the bottom of the fixed sleeve 7. Multiple sets of locking rods 28 are installed on the limiting sleeve 27.

[0036] The fixed sleeve 7 has a positioning groove 29, and multiple sets of positioning grooves 29 are provided. The limiting sleeve 27 has a sliding positioning block 30, and multiple sets of positioning blocks 30 are provided. Each of the top ends of the positioning blocks 30 is connected to the limiting sleeve 27 with a push spring 31.

[0037] More specifically, when the lock sleeve 13 slides into the lock groove 24, the rotating limiting sleeve 27 drives multiple sets of locking rods 28 to rotate, so that the multiple sets of locking rods 28 are inserted into multiple sets of lock holes 26 provided on the vertical rod 25, limiting the lock sleeve 13. At the same time as the limiting sleeve 27 rotates, multiple sets of positioning blocks 30 move in multiple sets of positioning grooves 29. The extension and retraction properties of multiple sets of push springs 31 allow the positioning blocks 30 to move in multiple sets of positioning grooves 29. After the limiting sleeve 27 stops rotating, the multiple sets of push springs 31 push the positioning blocks 30 to insert into the positioning grooves 29 and apply a certain force, so that the limiting sleeve 27 will not vibrate or move, thereby releasing the limitation on the lock sleeve 13.

[0038] In summary, during use or operation of the overall equipment: the height or angle of the side plate 14 and conveyor roller 16 is adjusted by adjusting the support legs 15; multiple sets of conveyor rollers 16 are driven by an external transmission structure to convey the cartons; the extension and retraction end of the control cylinder 2 drives the pad 3 to rise or fall, adjusting the stacking height of the cartons; then, the positioning rod 4 is installed according to the size and specifications of the cartons; the fixing sleeve 7 is fitted onto the fixing rod 6 at the designated position; the limiting strip 17 on the outer wall of the fixing rod 6 is aligned with the limiting groove 18 on the inner wall of the fixing sleeve 7 and inserted, so that the top of the fixing rod 6 is aligned with the top of the fixing rod. The top plate 10 is pushed upwards, pressing the top spring 21 and simultaneously pushing multiple sets of push blocks 22 while pressing the compression springs 23. The push blocks 22 push the arc-shaped rods 9 to slide along the sliding holes 8, causing the bottom locking block 11 to engage in the locking groove 12 provided on the outer wall of the fixed rod 6. Then, the sliding locking sleeve 13 engages in the locking groove 24 provided on the multiple sets of arc-shaped rods 9, locking the multiple sets of arc-shaped rods 9. At the same time, the top spring 21 and the multiple sets of compression springs 23 apply reverse pressure to the fixed rod 6 through their reset, making the engagement effect better. Finally, the locking sleeve 13 is fixed by the limiting mechanism. This completes the quick installation of the positioning rods 4. The cartons are then transported to the multiple sets of positioning rods 4 provided on the pad plate 3 by the conveyor roller 16 for stacking, and the carton stack is limited by the baffle 5.

[0039] When the lock sleeve 13 slides into the lock groove 24, the rotating limiting sleeve 27 drives multiple sets of locking rods 28 to rotate, so that the multiple sets of locking rods 28 are inserted into multiple sets of lock holes 26 provided on the vertical rod 25, limiting the lock sleeve 13. At the same time as the limiting sleeve 27 rotates, multiple sets of positioning blocks 30 move in multiple sets of positioning grooves 29. The extension and contraction performance of multiple sets of push springs 31 allows the positioning blocks 30 to move in multiple sets of positioning grooves 29. After the limiting sleeve 27 stops rotating, the multiple sets of push springs 31 push the positioning blocks 30 to insert into the positioning grooves 29 and apply a certain force, so that the limiting sleeve 27 will not vibrate or move, thereby releasing the limitation on the lock sleeve 13.

[0040] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. A cardboard box stacking device, comprising a base (1), characterized in that: A stacking mechanism is provided on the base (1). The stacking mechanism includes a conveying mechanism, a cylinder (2), a pad (3), a positioning rod (4), and a baffle (5). The conveying mechanism is located on one side of the base (1). The cylinder (2) is installed on the base (1). The pad (3) is installed on the telescopic end of the cylinder (2). The positioning rod (4) is installed on the pad (3) through a quick-fixing mechanism. The baffle (5) is installed on both sides of the base (1). The quick-fixing mechanism includes a fixing rod (6), a fixing sleeve (7), a sliding hole (8), an arc rod (9), a top plate (10), a locking block (11), a locking groove (12), and a locking sleeve. (13) The fixing rod (6) is provided with multiple sets installed on the pad (3), the fixing sleeve (7) is sleeved on the fixing rod (6) and the top end is fixedly connected to the positioning rod (4), the sliding hole (8) is provided with multiple sets distributed on the outside of the fixing sleeve (7), the arc rod (9) is slidably installed in the multiple sets of the sliding hole (8), the top plate (10) is provided in the fixing sleeve (7), the locking block (11) is installed at the bottom end of the multiple sets of the arc rod (9), the locking groove (12) is provided on the outer wall of the fixing rod (6) and the number is adapted to the multiple sets of the locking block (11), and the locking sleeve (13) is slidably installed on the outer wall of the fixing sleeve (7).

2. The cardboard box stacking equipment according to claim 1, characterized in that: The conveying mechanism includes a side plate (14), an adjusting support foot (15), and a conveying roller (16). The side plate (14) is installed on the outside of the two sets of baffles (5). The adjusting support foot (15) is provided in multiple sets installed on the bottom surface of the side plate (14). The conveying roller (16) is provided in multiple sets installed between the two sets of side plates (14) and connected to an external transmission structure.

3. The cardboard box stacking equipment according to claim 2, characterized in that: The outer wall of the fixing rod (6) is provided with a limiting strip (17), and multiple sets of the limiting strip (17) are provided. The inner wall of the fixing sleeve (7) is provided with a limiting groove (18), and multiple sets of the limiting groove (18) are provided and are adapted to multiple sets of the limiting strip (17).

4. A cardboard box stacking device according to claim 3, characterized in that: multiple sets Each of the sliding holes (8) is provided with a sliding groove (19), and the outer walls of the multiple sets of arc rods (9) are provided with sliding strips (20). The multiple sets of sliding grooves (19) and the multiple sets of sliding strips (20) are slidably connected respectively.

5. A cardboard box stacking device according to claim 4, characterized in that: A top spring (21) is provided between the top plate (10) and the inner top surface of the fixed sleeve (7). Each of the multiple sets of arc rods (9) is provided with a push block (22). Each of the multiple sets of push blocks (22) is spherical. Each of the multiple sets of push blocks (22) is provided with a compression spring (23) between the inner wall of the fixed sleeve (7).

6. A cardboard box stacking device according to claim 5, characterized in that: multiple sets Each of the arc-shaped rods (9) is provided with a locking groove (24), and multiple sets of the locking grooves (24) are adapted to the locking sleeve (13).

7. A cardboard box stacking device according to claim 6, characterized in that: The fixed sleeve (7) is provided with a limiting mechanism on its outer side. The limiting mechanism includes a vertical rod (25), a lock hole (26), a limiting sleeve (27), and a locking rod (28). The vertical rod (25) is provided in multiple sets and installed at the bottom end of the locking sleeve (13). The lock hole (26) is provided in multiple sets and distributed at the bottom ends of the vertical rod (25). The limiting sleeve (27) is rotatably installed at the bottom end of the fixed sleeve (7). The locking rod (28) is provided in multiple sets and installed on the limiting sleeve (27).

8. A cardboard box stacking device according to claim 7, characterized in that: The fixed sleeve (7) is provided with a positioning groove (29), and multiple sets of positioning grooves (29) are provided. The limiting sleeve (27) is provided with a positioning block (30), and multiple sets of positioning blocks (30) are provided, with a push spring (31) connected between the top end and the limiting sleeve (27).

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