Online material separating and pushing equipment for steel wire pipes

Abstract

The invention relates to the technical field of steel wire pipe production, in particular to steel wire pipe online material separating and pushing equipment which comprises two external connecting plates used for being connected with an external machine tool, lead screws are installed on one sides of the two external connecting plates in a threaded mode, and a working platform is jointly and fixedly installed at the tops of the two lead screws. An inclined placing plate is arranged on one side of the external connecting plate; the pushing assembly is arranged below the working platform; and the multiple feeding assemblies are all arranged above the inclined containing plate. Compared with the prior art, the feeding assembly is internally provided with the conveying module, so that the feeding assembly can adapt to steel wire pipes of different specifications, and the automation level of feeding and the universality and flexibility of the whole equipment are improved.

Description

Technical Field

[0001] The invention relates to the technical field of steel wire pipe production, and in particular to an online material separation and pushing device for steel wire pipes. Background Art

[0002] Steel wire pipe is a pipe made of steel wire and plastic composite. It has the characteristics of high pressure resistance, corrosion resistance, and strong flexibility. It is widely used in industrial fields such as conveying liquids, gases or granular materials. Since the production process of steel wire pipe involves a variety of materials (such as steel wire, plastic particles or melts) that need to be precisely controlled and gradually superimposed, the material separation and pushing equipment can realize the separation, metering, pushing and uniform feeding of raw materials, thereby ensuring the accurate proportion and uniform mixing of materials during processing, avoiding product quality problems caused by material mixing or uneven feeding, and at the same time improving production efficiency to meet complex process requirements.

[0003] In the prior art, steel wire tubes usually need to be placed one by one on a work platform manually and pushed into a machine tool or equipment by a cylinder. The entire loading process relies on manual operation, which is time-consuming and labor-intensive. Since the manual loading speed is usually difficult to fully match the equipment operating speed, interruptions are likely to occur during the transportation and pushing of the steel wire tubes, resulting in insufficient continuity in the operation of the equipment, affecting the overall rhythm of the production line. In addition, workers need to frequently place the steel wire tubes, leaving less time for workers to check the equipment or prepare the next batch of steel wire tubes, which increases labor intensity and is likely to lead to operator fatigue and decreased efficiency. Therefore, the present application discloses an online material separation and pushing equipment for steel wire tubes to meet the needs of continuous loading and pushing of steel wire tubes. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide an online material separation and pushing device for a steel wire tube to solve the problem that interruptions are easily occurred during the conveying and pushing process of the traditional steel wire tube.

[0005] Based on the above purpose, the present invention provides a wire tube online material separation and pushing device, comprising two external plates for connecting to an external machine tool, one side of the two external plates is threadedly mounted with a screw rod, the tops of the two screw rods are jointly provided with a working platform, one side of the working platform is provided with a sliding groove, and one side of the working platform is provided with an inclined inclined placement plate; A pushing component, the pushing component is arranged below the working platform, one side of the pushing component also penetrates the sliding groove, and the pushing component is used to push the steel wire tube on the working platform; A plurality of loading assemblies are provided above the inclined placement plate, and the loading assemblies are used for loading or preparing the steel wire tube. The loading assemblies include a conveying module and a driving module. The conveying module is used for conveying the steel wire tube, and the driving module is used for intermittently driving the conveying module.

[0006] Preferably, the pushing assembly includes a cylinder fixedly installed under the working platform, the telescopic end of the cylinder is fixedly connected to a driving rod, and a positioning rod is slidably installed above the cylinder, the driving rod and the positioning rod are arranged in parallel, and a push plate is commonly provided at one end of the driving rod and the positioning rod, the push plate passes through the sliding groove, and the push plate is slidably installed inside the sliding groove for pushing the wire tube.

[0007] Preferably, a rotating wheel is sleeved on one side of the two screw rods, and the rotating wheel is used to drive the screw rods to rotate to adjust the erection height of the working platform.

[0008] Preferably, the top surface of the working platform is arranged in a V shape.

[0009] Preferably, the conveying module includes a plurality of mounting plates fixedly mounted above the inclined placement plate, a rotating shaft is rotatably mounted on both sides of the bottom of the mounting plate, a first rotating plate is sleeved on the two rotating shafts, a second rotating plate is rotatably mounted on both sides of the top of the mounting plate, a hook-shaped driving plate is rotatably mounted between the first rotating plate and the second rotating plate, and a support plate is rotatably mounted on the middle parts of the two driving plates.

[0010] Preferably, a plurality of blocking blocks are arranged equidistantly above the support plate, a side of the blocking block close to the working platform is arranged in a straight surface, and a side of the blocking block away from the working platform is arranged in an arc shape.

[0011] Preferably, a torsion spring is provided at the connection between the rotating shaft and the first rotating plate, and the rotating shafts on the plurality of mounting plates are connected to each other.

[0012] Preferably, the driving module includes two telescopic rods fixedly mounted on one side of the working platform, and the telescopic ends of the two telescopic rods are jointly fixedly mounted with a lifting plate, two rotating shafts on one of the mounting plates are fixedly connected with gears, a toothed plate is slidably mounted on one side of the inclined plate, and a through groove matched with the toothed plate is also provided on one side of the inclined plate, a connecting rod is rotatably mounted on one side of the toothed plate, and the other end of the connecting rod is rotatably connected to the lifting plate, a parallel slide groove is provided on the top of the lifting plate, and a positioning slide rod is fixedly mounted on one side of the bottom of the push plate, the positioning slide rod passes through the parallel slide groove, and the positioning slide rod slides inside the parallel slide groove.

[0013] Preferably, a lower groove is further provided on one side of the lifting plate, a positioning block is provided inside the lower groove, and two sides of the positioning block are fixedly connected to the lifting plate by two connecting blocks, the top surface of the positioning block is flush with the bottom surface of the parallel slide groove, and the bottom surface of the positioning block and the bottom surface of the lower groove form an arc channel.

[0014] Preferably, a limiting plate is rotatably mounted on one end of the positioning block, a torsion spring is provided at the connection between the positioning block and the limiting plate, and a limiting groove matched with one end of the limiting plate is provided on one side of the top surface of the parallel slide groove.

[0015] Beneficial effects of the present invention: 1. This type of online material separation and pushing equipment for steel wire tubes is provided with a conveying module in the feeding assembly. The conveying module drives the rotation of the rotating shaft and the first rotating plate through the driving module, thereby realizing the tilting movement of the driving plate and the supporting plate, and conveying the steel wire tubes on the inclined placement plate to the V-shaped groove of the working platform one by one. The supporting plate accurately controls the movement of the steel wire tube with the action of the driving plate, and cooperates with the arc surface and the straight surface of the blocking block to effectively prevent the steel wire tube from retreating due to inertia or external force interference, thereby ensuring the stability and reliability of the conveying process. The reset function of the torsion spring enables the rotating shaft, the driving plate, and the supporting plate to quickly return to the initial state after the conveying is completed, thereby improving the operating efficiency of the equipment and being able to adapt to steel wire tubes of different specifications. It only needs to control the number of steel wire tubes on the conveying module to achieve continuity in the conveying process and prevent interruptions in the conveying and pushing process of the steel wire tube.

[0016] 2. This type of wire tube online material separation and pushing equipment is equipped with a driving module. The driving module drives the push plate to return and extend through the telescopic action of the cylinder, and realizes automatic pushing and precise limiting when the positioning slide bar passes through the limit plate, effectively ensuring the smooth operation and position control of the push plate. When the push plate is extended, the positioning slide bar is blocked by the limit plate and then enters the arc channel of the positioning block, pushing the lifting plate up, thereby driving the tooth plate to slide and drive the linkage action of the gear and the rotating shaft. This component realizes efficient cooperation of multi-stage power transmission, which can not only stably push the wire tube, but also provide driving force through gear linkage, ensuring the coordination and efficiency of the action of the whole set of equipment.

[0017] 3. This type of online material separation and pushing equipment for steel wire tubes is equipped with a pushing component. When the steel wire tube needs to be pushed, the cylinder starts and extends its driving rod. The driving rod drives the push plate to slide along the sliding groove, and the steel wire tube positioned on the V-shaped groove of the working platform is accurately pushed to the target position. During the pushing process, the positioning rod and the driving rod jointly maintain the smooth movement of the push plate to prevent the steel wire tube from shaking or shifting during the pushing process. When the pushing action is completed, the cylinder retracts the driving rod and drives the push plate back to the initial position to prepare for the next pushing action. At the same time, it also provides time for the loading component to complete the loading of the next steel wire tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention from a first viewing angle; Figure 2 For the present invention Figure 1 The enlarged structural diagram at A in the middle; Figure 3 It is a schematic diagram of the three-dimensional structure of the present invention from a second viewing angle; Figure 4 It is a bottom view structural schematic diagram of the present invention; Figure 5 For the present invention Figure 4 The enlarged structural diagram at B in the middle; Figure 6 This is a schematic diagram of the working platform and push component structure of the present invention; Figure 7 This is a schematic diagram of the bottom structure of the working platform and the pushing component of the present invention; Figure 8 This is a schematic diagram of the structure of the conveying module of the present invention; Fig. 9 This is a schematic diagram of the structure of the driving module of the present invention; Fig.10 For the present invention Fig. 9 Enlarged structural diagram at point C in the middle.

[0020] The markings in the figure are: 1. External plate; 2. Screw rod; 3. Working platform; 4. Rotating wheel; 5. Sliding groove; 6. Cylinder; 7. Driving rod; 8. Positioning rod; 9. Push plate; 10. Inclined plate; 11. Mounting plate; 12. First rotating plate; 13. Second rotating plate; 14. Driving plate; 15. Rotating shaft; 16. Support plate; 17. Blocking block; 18. Tooth plate; 19. Gear; 20. Through groove; 21. Connecting rod; 22. Telescopic rod; 23. Lifting plate; 24. Parallel slide groove; 25. Positioning slide rod; 26. Lower groove; 27. Positioning block; 28. Connecting block; 29. ​​Limiting plate; 30. Limiting groove. DETAILED DESCRIPTION

[0021] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0022] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] like Figures 1 to 10As shown, the wire tube online material separation and pushing equipment comprises two external plates 1 for connecting to an external machine tool, one side of the two external plates 1 is threadedly installed with a screw rod 2, a working platform 3 is commonly arranged on the top of the two screw rods 2, one side of the working platform 3 is provided with a sliding groove 5, and one side of the working platform 3 is provided with an inclined inclined placement plate 10; a pushing component, the pushing component is arranged below the working platform 3, one side of the pushing component also penetrates the sliding groove 5, and the pushing component is used to push the wire tube on the working platform 3; a plurality of feeding components, the plurality of feeding components are arranged above the inclined placement plate 10, the feeding components are used to feed or prepare the wire tube, the feeding components include a conveying module and a driving module, the conveying module is used to convey the wire tube, and the driving module is used to intermittently drive the conveying module, wherein one side of the two screw rods 2 is also sleeved with a rotating wheel 4, the rotating wheel 4 is used to drive the screw rod 2 to rotate, so as to adjust the erection height of the working platform 3, and the top surface of the working platform 3 is arranged in a V shape; When the equipment is started, the steel wire tubes are stacked on the inclined placement plate 10, and the conveying module of the loading component conveys the steel wire tubes one by one along the inclined direction to the V-shaped top surface of the working platform 3 for positioning. The pushing component moves through the sliding groove 5 to push the steel wire tube on the working platform 3 to the target processing position. After the pushing component completes the pushing action and returns to the initial position, it drives the driving module of the loading component to run, and the conveying module conveys the next steel wire tube to the working platform 3 to realize automatic loading. During the whole process, the inclined placement plate 10 provides a preliminary arrangement of the steel wire tubes, and the V-shaped top surface of the working platform 3 is formed. The glyph design ensures that the positioning of the steel wire tube is stable, and the loading and pushing actions are coordinated to ensure continuous and efficient operation of the equipment. The loading component is installed on the inclined placement plate 10, and cooperates with the drive module and the conveying module to realize the conveying of steel wire tubes one by one to avoid accumulation or blockage, greatly improving the loading efficiency, and at the same time realizing automated operation and reducing manual intervention. After the pushing component completes the pushing of the steel wire tube on the working platform 3, it automatically drives the drive module to run during the return journey, and drives the conveying module to load a new steel wire tube to the working platform 3, forming a continuous loading and pushing cycle, thereby improving processing efficiency.

[0024] like Figure 3 , Figure 4 , Figure 6 , Figure 7 As shown, the pushing assembly includes a cylinder 6 fixedly installed under the working platform 3, a driving rod 7 is fixedly connected to the telescopic end of the cylinder 6, and a positioning rod 8 is slidably installed above the cylinder 6. The driving rod 7 and the positioning rod 8 are arranged in parallel. A push plate 9 is commonly arranged at one end of the driving rod 7 and the positioning rod 8. The push plate 9 passes through the sliding groove 5 and is slidably installed inside the sliding groove 5 for pushing the steel wire tube; When the steel wire tube needs to be pushed, the cylinder 6 starts and retracts its driving rod 7. The driving rod 7 drives the push plate 9 to slide along the sliding groove 5, and the steel wire tube positioned on the V-shaped groove of the working platform 3 is accurately pushed to the target position. During the pushing process, the positioning rod 8 and the driving rod 7 jointly maintain the smooth movement of the push plate 9 to prevent the steel wire tube from shaking or shifting during the pushing process. When the pushing action is completed, the cylinder 6 retracts the driving rod 7, driving the push plate 9 back to the initial position to prepare for the next pushing action. At the same time, it also provides time for the loading component to complete the loading of the next steel wire tube. The whole process is compact and efficient, ensuring the coordination of continuous transportation and pushing of the steel wire tube.

[0025] like Figure 1 , Figure 2 , Figure 8 As shown, the conveying module includes a plurality of mounting plates 11 fixedly mounted above the inclined placement plate 10, a rotating shaft 15 is rotatably mounted on both sides of the bottom of the mounting plate 11, a first rotating plate 12 is sleeved on the two rotating shafts 15, and a second rotating plate 13 is rotatably mounted on both sides of the top of the mounting plate 11, a hook-shaped driving plate 14 is rotatably mounted between the first rotating plate 12 and the second rotating plate 13, a supporting plate 16 is rotatably mounted on the middle parts of the two driving plates 14, and a plurality of blocking blocks 17 are equidistantly arranged above the supporting plates 16, the side of the blocking block 17 close to the working platform 3 is arranged in a straight surface shape, and the side of the blocking block 17 away from the working platform 3 is arranged in an arc shape, a torsion spring is arranged at the connection between the rotating shaft 15 and the first rotating plate 12, and the rotating shafts 15 on the plurality of mounting plates 11 are connected to each other; First, the driving module is started, driving the rotating shaft 15 to rotate, and the rotating shaft 15 pushes the first rotating plate 12 to rotate. The first rotating plate 12 then drives the plate 14 to move toward the working platform 3 and produces a downward tilt angle change. At the same time, the supporting plate 16 tilts toward the working platform 3 as the driving plate 14 moves, gradually driving the steel wire tube on the inclined placement plate 10 to shift position, so that the steel wire tube closest to the working platform 3 is transported to the V-shaped groove of the working platform 3. After the transportation is completed, the torsion spring causes the rotating shaft 15 to reset, driving the first rotating plate 12 , the driving plate 14 and the supporting plate 16 return to their initial positions to prepare for the next conveying action. During this process, the arc-shaped surface of the blocking block 17 enables the steel wire tube to move forward smoothly during transportation, while the straight surface effectively prevents the steel wire tube from retreating due to inertia or other interference factors, thereby ensuring the smooth progress of the conveying action. The side of the blocking block 17 away from the working platform 3 is in an arc shape, which facilitates the smooth advancement of the steel wire tube during transportation, while the side close to the working platform 3 is in a straight surface shape, which effectively prevents the steel wire tube from retreating during transportation, thereby improving the reliability of transportation.

[0026] like Figure 1 , Figure 2 , Figure 5 , Fig. 9 , Fig.10 As shown, the driving module includes two telescopic rods 22 fixedly mounted on one side of the working platform 3, and a lifting plate 23 is fixedly mounted on the telescopic ends of the two telescopic rods 22. Two rotating shafts 15 on one mounting plate 11 are fixedly connected with gears 19, and a toothed plate 18 is slidably mounted on one side of the tilted placement plate 10. A through groove 20 adapted to the toothed plate 18 is also provided on one side of the tilted placement plate 10. A connecting rod 21 is rotatably mounted on one side of the toothed plate 18, and the other end of the connecting rod 21 is rotatably connected to the lifting plate 23. A parallel slide groove 24 is provided on the top of the lifting plate 23, and a positioning slide rod 25 is fixedly mounted on one side of the bottom of the push plate 9. The positioning slide rod 25 passes through the flat A parallel slide groove 24 is provided, and the positioning slide bar 25 slides inside the parallel slide groove 24. A lower groove 26 is also provided on one side of the lifting plate 23. A positioning block 27 is provided inside the lower groove 26. Two connecting blocks 28 are provided on both sides of the positioning block 27 to be fixedly connected to the lifting plate 23. The top surface of the positioning block 27 is flush with the bottom surface of the parallel slide groove 24. The bottom surface of the positioning block 27 and the bottom surface of the lower groove 26 form an arc channel. A limiting plate 29 is rotatably installed on one end of the positioning block 27. A torsion spring is provided at the connection between the positioning block 27 and the limiting plate 29. A limiting groove 30 adapted to one end of the limiting plate 29 is provided on one side of the top surface of the parallel slide groove 24. When the cylinder 6 drives the push plate 9 to return, the push plate 9 pushes the wire tube on the working platform 3 to the discharging position, and the positioning slide bar 25 slides and moves in the parallel slide groove 24, and when passing through the limit plate 29, it directly pushes the limit plate 29 to pass smoothly without being hindered by the limit plate 29. When the cylinder 6 drives the push plate 9 to extend, the positioning slide bar 25 slides for a distance and is blocked by the limit plate 29. At this time, the positioning slide bar 25 can only slide to the arc channel between the lower groove 26 of the positioning block 27 and the limit plate 29. As the positioning slide bar 25 enters the arc channel, its movement pushes the lifting plate 23 to move upward. The rising action of the lifting plate 23 drives the tooth plate 18 to slide along the inclined placement plate 10. The sliding of the tooth plate 18 causes the two gears 19 to rotate. The rotation of the gear 19 further drives the two rotating shafts 15 connected thereto to rotate synchronously, thereby realizing the linkage driving action of the drive assembly.

[0027] A person skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0028] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A wire tube online material separation and pushing equipment, characterized in that: include: Two external plates (1) for connecting to an external machine tool, one side of the two external plates (1) is threadedly mounted with a screw rod (2), the tops of the two screw rods (2) are jointly provided with a working platform (3), one side of the working platform (3) is provided with a sliding groove (5), and one side of the working platform (3) is provided with an inclined inclined placement plate (10); a pushing component, the pushing component is arranged below the working platform (3), one side of the pushing component also penetrates the sliding groove (5), the pushing component is used to push the steel wire tube on the working platform (3); a plurality of feeding components, the plurality of feeding components are arranged above the inclined placement plate (10), the feeding components are used to feed or prepare the steel wire tube, the feeding components include a conveying module and a driving module, the conveying module is used to convey the steel wire tube, and the driving module is used to intermittently drive the conveying module.

2. The wire tube online material separation and pushing equipment according to claim 1 is characterized in that: The pushing assembly comprises a cylinder (6) fixedly mounted below the working platform (3); a driving rod (7) is fixedly connected to the telescopic end of the cylinder (6); a positioning rod (8) is slidably mounted above the cylinder (6); the driving rod (7) and the positioning rod (8) are arranged in parallel; a push plate (9) is commonly arranged at one end of the driving rod (7) and the positioning rod (8); the push plate (9) penetrates the sliding groove (5) and is slidably mounted inside the sliding groove (5) for pushing the steel wire tube.

3. The wire tube online material separation and pushing equipment according to claim 2 is characterized in that: A rotating wheel (4) is also sleeved on one side of the two screw rods (2), and the rotating wheel (4) is used to drive the screw rods (2) to rotate, so as to adjust the erection height of the working platform (3).

4. The steel wire tube online material separation and pushing equipment according to claim 3 is characterized in that: The top surface of the working platform (3) is arranged in a V shape.

5. The steel wire tube online material separation and pushing equipment according to claim 1 is characterized in that: The conveying module comprises a plurality of mounting plates (11) fixedly mounted above the inclined placement plate (10), wherein rotating shafts (15) are rotatably mounted on both sides of the bottom of the mounting plate (11), and a first rotating plate (12) is sleeved on the two rotating shafts (15). A second rotating plate (13) is rotatably mounted on both sides of the top of the mounting plate (11), a hook-shaped driving plate (14) is rotatably mounted between the first rotating plate (12) and the second rotating plate (13), and a support plate (16) is rotatably mounted in the middle of the two driving plates (14).

6. The wire tube online material separation and pushing equipment according to claim 5 is characterized in that: A plurality of blocking blocks (17) are arranged equidistantly above the support plate (16); a side of the blocking block (17) close to the working platform (3) is arranged in a straight shape, and a side of the blocking block (17) away from the working platform (3) is arranged in an arc shape.

7. The wire tube online material separation and pushing equipment according to claim 6 is characterized in that: A torsion spring is provided at the connection between the rotating shaft (15) and the first rotating plate (12), and a plurality of rotating shafts (15) on the mounting plates (11) are connected to each other.

8. The steel wire tube online material separation and pushing equipment according to claim 2 or 7, characterized in that: The driving module comprises two telescopic rods (22) fixedly mounted on one side of the working platform (3), the telescopic ends of the two telescopic rods (22) being fixedly mounted with a lifting plate (23), the two rotating shafts (15) on one of the mounting plates (11) being fixedly connected with a gear (19), a tooth plate (18) being slidably mounted on one side of the tilting plate (10), a through groove (20) matching the tooth plate (18) being also provided on one side of the tilting plate (10), a connecting rod (21) being rotatably mounted on one side of the tooth plate (18), the other end of the connecting rod (21) being rotatably connected with the lifting plate (23), a parallel slide groove (24) being provided on the top of the lifting plate (23), a positioning slide rod (25) being fixedly mounted on one side of the bottom of the push plate (9), the positioning slide rod (25) being arranged to penetrate the parallel slide groove (24), and the positioning slide rod (25) being slidable inside the parallel slide groove (24).

9. The steel wire tube online material separation and pushing equipment according to claim 8, characterized in that: A lower groove (26) is further provided on one side of the lifting plate (23), a positioning block (27) is provided inside the lower groove (26), two sides of the positioning block (27) are fixedly connected to the lifting plate (23) by two connecting blocks (28), the top surface of the positioning block (27) is flush with the bottom surface of the parallel slide groove (24), and the bottom surface of the positioning block (27) and the bottom surface of the lower groove (26) form an arc-shaped channel.

10. The wire tube online material separation and pushing equipment according to claim 9, characterized in that: A limiting plate (29) is rotatably mounted on one end of the positioning block (27), a torsion spring is provided at the connection between the positioning block (27) and the limiting plate (29), and a limiting groove (30) adapted to one end of the limiting plate (29) is provided on one side of the top surface of the parallel slide groove (24).

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