A support structure for laser cutting with intelligent switching of cutting points

Abstract

The application belongs to the technical field of laser cutting and discloses a support structure for laser cutting with intelligent switching of cutting points, which comprises a support mounting frame, the inner side surface of the support mounting frame is provided with support bearing trays, the ends of the two support bearing trays are attached to each other, and the inner side of the support bearing tray is provided with a switching support mechanism. When the laser cutter moves to the position, the support of the workpiece is released, so that the laser cutter does not cause damage to the support structure. The support structure for laser cutting with intelligent switching of cutting points uses a centering mounting ring to fix the movable electromagnet at the lower end of the laser cutter. When the movable electromagnet moves to the adaptive top rod, the adaptive top rod can slide downward to release the support of the workpiece through repulsion of the magnetic column, so that the damage to the support structure is avoided. When it is necessary to clean the cutting waste in the support bearing tray, the support bearing tray is turned downward during the sliding process to realize the dumping of the waste.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of laser cutting, in particular to a support structure for laser cutting with intelligent switching of cutting points. BACKGROUND

[0002] In today's rapidly developing industrial field, laser cutting technology has become the preferred processing method for many manufacturing enterprises due to its outstanding precision, efficient cutting speed and wide applicability. The support structure for laser cutting, as an important auxiliary equipment in the laser cutting process, directly affects the cutting quality and production efficiency. The traditional support structure for laser cutting has played a certain role in the past industrial production, but with the continuous improvement of industrial demand and the continuous progress of technology, its limitations have become increasingly prominent. The widely used support structure mostly adopts a fixed support method. When facing workpieces of different shapes, sizes and materials, although it can provide a certain degree of stability for the workpiece to ensure that the workpiece does not shift or shake during the cutting process, this fixed support method has a serious drawback that the workpiece at the support position cannot be cut during the cutting process. This drawback has brought many problems in actual production. First of all, for some complex-shaped workpieces, such as workpieces with curved surfaces, concave corners or irregular contours, the traditional support structure often hinders the laser beam from reaching some key parts, resulting in incomplete cutting of these parts. This not only affects the overall quality of the workpiece, but also may make the cut workpiece unable to meet the design requirements, requiring additional secondary processing. Secondary processing not only increases production time and cost, but also reduces production efficiency and affects the economic benefits of enterprises. Secondly, in some applications with extremely high precision requirements, such as aerospace, precision instrument manufacturing, etc., even a small amount of uncut support position may have a significant impact on the performance and reliability of the entire product. For example, in the manufacturing of aerospace parts, any residual support material may affect the aerodynamic performance or structural strength of the parts, thereby endangering the safety of the aircraft. In addition, the limitations of the traditional support structure also limit the application of laser cutting technology in the processing of some special materials. For some high-hardness, high-brittle or heat-sensitive materials, accurate cutting is crucial. However, due to the inability to cut the support position, stress concentration, cracking or deformation may occur on these materials, seriously affecting the performance and service life of the materials. Furthermore, from the perspective of production process, the shortcomings of the traditional support structure also bring certain difficulties to production management. In order to avoid the impact of the support position on cutting, production personnel need to perform complex workpiece positioning and support structure adjustment before cutting, which not only increases the complexity of operation, but also is prone to human error. Moreover, during the processing of different workpieces, the support structure may need to be frequently replaced or adjusted, further reducing production efficiency. The existing support structure for laser cutting cannot cut the workpiece at the support position during the cutting process, which has become an important factor restricting the further development and application of laser cutting technology. In order to solve this problem, there is an urgent need for a new type of laser cutting support structure with intelligent switching of cutting points. SUMMARY

[0003] The present application aims to provide a support structure for laser cutting with intelligent switching of cutting point positions to solve the problem of being unable to cut the position of the workpiece supported in the background art.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a support structure for laser cutting with intelligent switching of cutting point positions, comprising a support mounting frame, the inner side surface of the support mounting frame is provided with a support support tray, the ends of the two support support trays facing each other are attached, the inner side of the support support tray is provided with a switching support mechanism, by releasing the support of the workpiece when the laser cutter moves to the position, the damage of the support structure caused by the laser cutter is avoided.

[0005] Preferably, the switching support mechanism comprises: a fixed support rod, the fixed support rod is fixedly installed on the inner bottom surface of the support support tray, and the outer surface of the middle section of the fixed support rod is fixedly provided with a support disc, the outer surface of the upper end of the fixed support rod is provided with a sliding support ring, the side surface of the middle section of the fixed support rod is provided with a gap slot, the inner side surface of the support ring is fixedly provided with an extrusion rod, the inside of the fixed support rod is provided with a rotating spiral rod, and the upper end of the spiral rod is fixedly connected with a threaded column, the upper end of the threaded column is provided with an adaptive top rod, the side surface of the upper end of the fixed support rod is provided with a through groove, the outer surface of the lower end of the adaptive top rod is fixedly provided with a limiting block, the upper surface of the support ring is fixedly provided with a magnetic column, the upper side of the adaptive top rod is provided with a centering mounting ring, the side surface of the centering mounting ring is fixedly provided with a sliding rod, the side surface of the centering mounting ring is slidingly provided with a positioning clamping plate, the side surface of the centering mounting ring is provided with a rotating adjusting rod, and the lower end of the centering mounting ring is fixedly provided with a movable electromagnet.

[0006] By using the repulsion of the movable electromagnet to the magnetic column, the magnetic column can drive the support ring to slide down, so that the spiral rod drives the threaded column to rotate and drives the adaptive top rod to slide down to release the support of the workpiece.

[0007] Preferably, the fixed support rod, the support disc and the support ring are concentrically designed, and a spring is fixedly connected between the lower surface of the support ring and the upper surface of the support disc, one end of the extrusion rod penetrates the gap slot, and the end of the extrusion rod penetrating the gap slot is located in the inside of the fixed support rod, and the end of the extrusion rod located in the inside of the fixed support rod is clamped with the spiral rod, the two extrusion rods are arranged in an upper and lower staggered manner, and the two extrusion rods are symmetrically arranged relative to the spiral rod.

[0008] By using the above technical scheme, the support ring can drive the spiral rod to rotate through the clamping of the extrusion rod penetrating the gap slot with the spiral rod.

[0009] Preferably, the twisted rod and the threaded column are concentrically designed, the threaded column is threadedly connected with the adaptive top rod, the upper end of the adaptive top rod is designed as a circular truncated cone with a small upper end and a large lower end, and the outer surface of the twisted rod is gap-fitted with the inner surface of the fixed support rod.

[0010] The above technical solution enables the twisted rod to drive the threaded column to rotate and drive the adaptive top rod to slide downward relative to the fixed support rod to release the support on the workpiece through the threaded connection between the threaded column and the adaptive top rod.

[0011] Preferably, one end of the limiting block penetrates through the through groove, and the outer surface of the limiting block is slidingly connected with the through groove.

[0012] The above technical solution enables the adaptive top rod to stably slide downward relative to the fixed support rod through the sliding connection between the limiting block and the through groove without rotating with the threaded column.

[0013] Preferably, one end of the positioning clamping plate inside the centering mounting ring is designed as an arc, the positioning clamping plate is slidingly connected with the sliding rod, the positioning clamping plate is threadedly connected with the adjusting rod, the positioning clamping plates are uniformly arranged on the inner surface of the centering mounting ring and are concentrically arranged with the centering mounting ring, the positioning clamping plate is a plate made of hard silica gel material, the centering mounting ring is concentrically arranged with the movable electromagnet, the end of the movable electromagnet facing the magnetic column has the same magnetic pole as the magnetic column, the magnetic column is symmetrically arranged on the upper surface of the bearing ring with the fixed support rod as the axis, and the upper end surface of the magnetic column is lower than the upper end surface of the fixed support rod.

[0014] The above technical solution enables the movable electromagnet to repel the magnetic column and drive the bearing ring to slide downward to compress the spring between the bearing ring and the support disc after being electrified.

[0015] Preferably, the surface of the support mounting frame is provided with a waste discharge mechanism, which realizes the dumping of waste by switching the displacement and angle of the support bearing disc.

[0016] The above technical solution ensures that the support bearing disc supports the high-temperature waste during the cutting process and prevents the waste from falling and splashing.

[0017] Preferably, the waste discharge mechanism comprises an electric push rod, one end of an elastic rope is fixedly connected with one end of the support bearing disc, the other end of the elastic rope is fixedly connected with one end of the electric push rod, a guide rod is fixedly arranged on the outer surface of the support bearing disc, a guide groove is arranged on the lower end outer surface of the support mounting frame, a sliding groove is arranged on the upper end outer surface of the support mounting frame, a reversing gear is fixedly arranged on the lower end outer surface of the support bearing disc, and a reversing gear block is fixedly arranged on the outer surface of the support mounting frame.

[0018] The support tray can be timely overturned downward to dump the waste in the support tray during sliding.

[0019] Preferably, one end of the guide rod is located inside the guide groove, and one end of the guide groove is designed to be downwardly inclined.

[0020] The guide rod can be actively turned upward when being pushed horizontally, supported by the inclined lower end of the guide groove.

[0021] Preferably, one end of the reversing gear is located inside the sliding groove, the reversing tooth block is located above the reversing gear, the reversing tooth block is located on the side of the reversing gear away from the guide groove, and the reversing tooth block and the guide rod are respectively located at two ends of the support tray.

[0022] The reversing gear can drive the support tray to be overturned for dumping waste and resetting the support tray when the reversing gear slides in the sliding groove through meshing with the reversing tooth block.

[0023] Compared with the prior art, the cutting point intelligent switching support structure for laser cutting has the following advantages:

[0024] 1. The movable electromagnet is fixed at the lower end of the laser cutter by the centering mounting ring. When the movable electromagnet moves to the adaptive jack, the magnetic column can slide downward to drive the threaded column to rotate, so that the adaptive jack can slide downward to release the support of the workpiece, thereby avoiding damage to the support structure.

[0025] 2. When it is necessary to clean the cutting waste in the support tray, the two support trays are relatively separated by sliding, so that the support tray can be automatically overturned downward during sliding to dump the waste, thereby saving the cleaning process of the waste, and ensuring that the support tray supports the high-temperature waste during cutting to prevent the waste from falling and splashing. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present application.

[0027] Figure 2 It is a schematic diagram of the connection between the support mounting frame and the support tray of the present application.

[0028] Figure 3 It is a schematic diagram of the connection between the support mounting frame and the support tray of the present application.

[0029] Figure 4This is a three-dimensional structural diagram of the connection between the reversing gear and the reversing tooth block of the present invention;

[0030] Figure 5 This is a schematic diagram of the three-dimensional structure connecting the support tray, guide rod, and reversing gear of the present invention;

[0031] Figure 6 This is a three-dimensional structural diagram of the connection between the fixed support rod, support plate, and support ring of the present invention;

[0032] Figure 7 This is a three-dimensional structural diagram of the connection between the fixed support rod and the adaptive top rod of the present invention;

[0033] Figure 8 This is a three-dimensional structural diagram of the connection between the fixed support rod, support plate, and support ring of the present invention;

[0034] Figure 9 This is a three-dimensional structural diagram of the connection between the sliding rod, the positioning clamping plate, and the adjusting rod of the present invention;

[0035] Figure 10 This is a three-dimensional structural diagram of the connection between the centering mounting ring and the positioning clamping plate of the present invention.

[0036] In the diagram: 1. Support mounting bracket; 2. Support tray; 3. Fixed support rod; 4. Support plate; 5. Support ring; 6. Clearance groove; 7. Extrusion rod; 8. Twisted rod; 9. Threaded column; 10. Adaptive top rod; 11. Through groove; 12. Limiting block; 13. Magnetic column; 14. Centering mounting ring; 15. Sliding rod; 16. Positioning clamping plate; 17. Adjusting rod; 18. Movable electromagnet; 19. Electric push rod; 20. Elastic rope; 21. Guide rod; 22. Guide groove; 23. Sliding groove; 24. Reversing gear; 25. Reversing gear block. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Please see Figures 1-10 The present invention provides a technical solution: a support structure for laser cutting with intelligent switching of cutting points.

[0039] In this embodiment, a support mounting frame 1 is disclosed, the inner side surface of the support mounting frame 1 is provided with a support support tray 2, the opposite ends of the two support support trays 2 are attached, the inner side of the support support tray 2 is provided with a switching support mechanism, and the support structure is avoided from being damaged by the laser cutting machine when the laser cutting machine is moved to the position and the workpiece support is released;

[0040] The switching support mechanism comprises: a fixed support rod 3 fixedly installed in the inner bottom surface of the support support tray 2, and a support disc 4 fixedly arranged on the outer surface of the middle segment of the fixed support rod 3; a sliding support ring 5 is installed on the upper end of the fixed support rod 3; a displacement slot 6 is formed in the side surface of the middle segment of the fixed support rod 3; an extrusion rod 7 is fixedly arranged on the inner side surface of the support ring 5; a rotating twist rod 8 is installed in the inside of the fixed support rod 3, and a threaded column 9 is fixedly connected to the upper end of the twist rod 8; an adaptive top rod 10 is installed on the upper end of the threaded column 9; a through slot 11 is formed in the side surface of the upper end of the fixed support rod 3; a limiting block 12 is fixedly arranged on the outer surface of the lower end of the adaptive top rod 10; a magnetic column 13 is fixedly arranged on the upper surface of the support ring 5; a centering installation ring 14 is arranged above the adaptive top rod 10, and a sliding rod 15 is fixedly arranged on the side surface of the centering installation ring 14; a positioning clamping plate 16 is slidingly installed on the side surface of the centering installation ring 14; a rotating adjusting rod 17 is installed on the side surface of the centering installation ring 14; and a movable electromagnet 18 is fixedly arranged on the lower end of the centering installation ring 14.

[0041] The fixed support rod 3, the support disc 4 and the support ring 5 are concentrically designed, and a spring is fixedly connected between the lower surface of the support ring 5 and the upper surface of the support disc 4; one end of the extrusion rod 7 penetrates the displacement slot 6, and the one end of the extrusion rod 7 penetrating the displacement slot 6 is located in the inside of the fixed support rod 3, and the one end of the extrusion rod 7 located in the inside of the fixed support rod 3 is clampedly installed with the twist rod 8; the two extrusion rods 7 are arranged in an upper-lower staggered manner, and the two extrusion rods 7 are symmetrically arranged relative to the twist rod 8.

[0042] The twist rod 8 and the threaded column 9 are concentrically designed, the threaded column 9 is threadedly connected with the adaptive top rod 10, the upper end of the adaptive top rod 10 is designed in a circular truncated cone shape with a small upper end and a large lower end, and the outer side surface of the twist rod 8 is gap-fitted with the inner side surface of the fixed support rod 3.

[0043] One end of the limiting block 12 penetrates the through slot 11, and the outer surface of the limiting block 12 is slidingly connected with the through slot 11.

[0044] The positioning clamping plate 16 is arc-shaped at one end inside the centering mounting ring 14, and is in sliding connection with the sliding rod 15, and is in threaded connection with the adjusting rod 17, the positioning clamping plate 16 is uniformly arranged on the inner side surface of the centering mounting ring 14, and is concentrically arranged with the centering mounting ring 14, and the positioning clamping plate 16 is a plate made of hard silica gel material, the centering mounting ring 14 is concentrically arranged with the movable electromagnet 18, the movable electromagnet 18 is the same as the magnetic pole of the end of the magnetic column 13 facing each other, the magnetic column 13 is symmetrically arranged on the upper surface of the supporting ring 5 with the fixed support rod 3 as the axis, and the upper end surface of the magnetic column 13 is lower than the upper end surface of the fixed support rod 3;

[0045] In the laser cutting process, the workpiece is placed in the support supporting tray 2 supported by the adaptive top rod 10, first, the centering mounting ring 14 is sleeved on the outer surface of the laser cutter, then the adjusting rod 17 is twisted, the positioning clamping plate 16 is driven to slide relative to the sliding rod 15 and the centering mounting ring 14 through the threaded connection between the adjusting rod 17 and the positioning clamping plate 16, and the positioning clamping plate 16 is in contact with the laser cutter to support the laser cutter, so that the movable electromagnet 18 can move synchronously with the laser cutter;

[0046] When the laser cutter moves above the fixed support rod 3, the movable electromagnet 18 is energized to repel the magnetic column 13 at this time, the magnetic column 13 drives the supporting ring 5 to slide down and compresses the spring between the supporting ring 5 and the support disc 4, at this time, the supporting ring 5 drives the twist drill 8 to rotate through the extrusion rod 7 passing through the displacement slot 6 and the clamping of the twist drill 8, the twist drill 8 drives the threaded column 9 to rotate, the threaded column 9 drives the adaptive top rod 10 to slide down relative to the fixed support rod 3 through the threaded connection with the adaptive top rod 10, the sliding connection of the limiting block 12 and the through slot 11, and the support of the workpiece is released to avoid damage to the adaptive top rod 10.

[0047] Embodiment two: the surface of the support mounting frame 1 is provided with a waste discharge mechanism, which realizes the dumping of waste by switching the displacement and angle of the support supporting tray 2;

[0048] The waste discharge mechanism comprises an electric push rod 19, the electric push rod 19 is fixedly arranged on the inner side surface of the support mounting frame 1, one end of the support supporting tray 2 is fixedly connected with one end of an elastic rope 20, the other end of the elastic rope 20 is fixedly connected with one end of the electric push rod 19, a guide rod 21 is fixedly arranged on the outer side surface of the support supporting tray 2, a guide slot 22 is formed on the lower end outer side surface of the support mounting frame 1, a sliding slot 23 is formed on the upper end outer side surface of the support mounting frame 1, a reversing gear 24 is fixedly arranged on the lower end outer side surface of the support supporting tray 2, and a reversing tooth block 25 is fixedly arranged on the outer side surface of the support mounting frame 1;

[0049] One end of the guide rod 21 is located inside the guide groove 22, and one end of the guide groove 22 is designed to be inclined downward;

[0050] One end of the reversing gear 24 is located inside the sliding groove 23, the reversing tooth block 25 is located above the reversing gear 24, the reversing tooth block 25 is located on the side of the reversing gear 24 away from the guide groove 22, and the reversing tooth block 25 and the guide rod 21 are respectively located at both ends of the support tray 2;

[0051] When it is necessary to clean the waste inside the support tray 2, the electric push rod 19 is started at this time, the electric push rod 19 pulls the support tray 2 to slide relative to the support mounting frame 1 through the elastic rope 20, until the support tray 2 drives the guide rod 21 to slide off the connection with the guide groove 22, at this time the reversing gear 24 in the sliding groove 23 is just engaged with the reversing tooth block 25, so that the support tray 2 is driven to rotate, so that the two support trays 2 are opposite to each other The end is turned down to pour the waste;

[0052] After pouring is completed, the electric push rod 19 at this time drives the support tray 2 to slide and make the two support trays 2 slide towards each other and be reset by the engagement of the reversing gear 24 and the reversing tooth block 25.

[0053] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A support structure for laser cutting with intelligent switching of cutting points, comprising a support mounting frame (1), the inner side surface of the support mounting frame (1) is provided with a support bearing tray (2), the two support bearing trays (2) are pasted at one end of the opposite direction, characterized in that: The inner side of the support bearing tray (2) is provided with a switching support mechanism, which avoids damage to the support structure by the laser cutting machine when the laser cutting machine is moved into position and the support for the workpiece is released. The switching support mechanism comprises a fixed support rod (3) fixedly installed on the inner bottom surface of the support bearing tray (2), and a support disc (4) fixedly arranged on the outer surface of the middle section of the fixed support rod (3), a sliding support ring (5) installed on the outer surface of the upper end of the fixed support rod (3), a let-in slot (6) formed on the side surface of the middle section of the fixed support rod (3), an extrusion rod (7) fixedly arranged on the inner surface of the support ring (5), a rotating spiral rod (8) installed in the fixed support rod (3), a threaded column (9) fixedly connected to the upper end of the spiral rod (8), an adaptive jack (10) installed on the upper end of the threaded column (9), a through slot (11) formed on the side surface of the upper end of the fixed support rod (3), a limit block (12) fixedly arranged on the outer surface of the lower end of the adaptive jack (10), a magnetic column (13) fixedly arranged on the upper surface of the support ring (5), a centering mounting ring (14) arranged above the adaptive jack (10), a sliding rod (15) fixedly arranged on the side surface of the centering mounting ring (14), a positioning clamping plate (16) slidingly installed on the side surface of the centering mounting ring (14), a rotating adjusting rod (17) installed on the side surface of the centering mounting ring (14), and a movable electromagnet (18) fixedly arranged on the lower end of the centering mounting ring (14). The fixed support rod (3), the support disc (4) and the support ring (5) are concentrically designed, and a spring is fixedly connected between the lower surface of the support ring (5) and the upper surface of the support disc (4), one end of the extrusion rod (7) penetrates the let-in slot (6), and the one end of the extrusion rod (7) penetrating the let-in slot (6) is located in the fixed support rod (3), and the one end of the extrusion rod (7) located in the fixed support rod (3) is snap-fit installed with the spiral rod (8), and the two extrusion rods (7) are arranged in an upper-lower staggered manner and symmetrically arranged with respect to the spiral rod (8). The one end of the positioning clamping plate (16) located inside the centering mounting ring (14) is arc-shaped, the positioning clamping plate (16) is slidingly connected with the sliding rod (15), and the positioning clamping plate (16) is screwedly connected with the adjusting rod (17), the positioning clamping plates (16) are uniformly arranged on the inner side surface of the centering mounting ring (14), the positioning clamping plate (16) is concentrically arranged with the centering mounting ring (14), the positioning clamping plate (16) is a plate made of hard silica gel material, the centering mounting ring (14) is concentrically arranged with the movable electromagnet (18), the end of the movable electromagnet (18) facing the magnetic column (13) has the same magnetic pole as the magnetic column (13), the magnetic column (13) is symmetrically arranged on the upper surface of the support ring (5) with the fixed support rod (3) as the axis, and the upper end surface of the magnetic column (13) is lower than the upper end surface of the fixed support rod (3).

2. The support structure for laser cutting with intelligent switching of cutting points according to claim 1, characterized in that: The twisted rod (8) is concentric with the threaded column (9), the threaded column (9) is threadedly connected with the adaptive ejector rod (10), the upper end of the adaptive ejector rod (10) is designed as a circular truncated cone with a small upper end and a large lower end, and the outer surface of the twisted rod (8) is clearance-fitted with the inner surface of the fixed support rod (3).

3. The support structure for laser cutting with intelligent switching of cutting points according to claim 1, characterized in that: One end of the limiting block (12) penetrates the through groove (11), and the outer surface of the limiting block (12) is slidingly connected with the through groove (11).

4. The support structure for laser cutting with intelligent switching of cutting points according to claim 1, characterized in that: The surface of the support mounting frame (1) is provided with a waste discharge mechanism, which realizes dumping of waste by switching the displacement and angle of the support supporting tray (2).

5. The support structure for laser cutting with intelligent switching of cutting points according to claim 4, characterized in that: The waste discharge mechanism comprises an electric push rod (19) fixedly arranged on the inner surface of the support mounting frame (1), one end of the support supporting tray (2) is fixedly connected with one end of an elastic rope (20), the other end of the elastic rope (20) is fixedly connected with one end of the electric push rod (19), the outer surface of the support supporting tray (2) is fixedly provided with a guide rod (21), the lower end outer surface of the support mounting frame (1) is provided with a guide groove (22), and the upper end outer surface of the support mounting frame (1) is provided with a sliding groove (23), the lower end outer surface of the support supporting tray (2) is fixedly provided with a reversing gear (24), and the outer surface of the support mounting frame (1) is fixedly provided with a reversing gear block (25).

6. The support structure for laser cutting with intelligent switching of cutting points according to claim 5, characterized in that: One end of the guide rod (21) is located inside the guide groove (22), and one end of the guide groove (22) is designed to be downwardly inclined.

7. The support structure for laser cutting with intelligent switching of cutting points according to claim 5, characterized in that: One end of the reversing gear (24) is located inside the sliding groove (23), the reversing gear block (25) is located above the reversing gear (24), the reversing gear block (25) is located on the side of the reversing gear (24) away from the guide groove (22), and the reversing gear block (25) and the guide rod (21) are located at two ends of the support supporting tray (2) respectively.

Images