Logistics tray welding production line based on circulating feeding structure

Abstract

The application relates to the technical field of welding and discloses a logistics pallet welding production line based on a circulating feeding structure, which comprises a welding part and a placing part; the placing part comprises a rack, a sliding hole is formed in the top of the rack, a guide frame is fixedly connected to the bottom of the rack, the sliding hole and the guide frame are respectively provided with two and are distributed in a left-right symmetry mode along the center of the rack, and the bottom of the rack is provided with a limiting piece which can be used for adjusting the position of a rib strip; wherein the limiting piece comprises a moving plate which is slidably connected to the bottom of the rack through guide blocks arranged on the top of the moving plate. The logistics pallet welding production line based on the circulating feeding structure can effectively solve the problem that, in the prior art, the manual placement of the rib strip is limited by technical level, visual fatigue and other factors, the precision is often low, and a large error can lead to the fact that the rib strip cannot be welded at a required interval, thereby influencing the stress condition of the rib strip in the later use and reducing the use stability of the pallet.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of welding, in particular to a logistics pallet welding production line based on a circulating feeding structure. BACKGROUND

[0002] The logistics pallet is a widely used cargo carrying tool in the logistics industry, usually made of high-strength aluminum alloy or other metal materials. The high-strength aluminum alloy has the characteristics of light weight, high strength and corrosion resistance. The aluminum alloy pallet mainly includes a frame, longitudinal support bars and support seats. The frame constitutes the peripheral frame of the pallet and plays a role in overall definition and protection. The longitudinal support bars are distributed in the frame and used for carrying goods.

[0003] In the prior art, in order to ensure the stability of the pallet structure, a plurality of reinforcing ribs are arranged on the support bars. Each rib needs to be welded at the contact part with the frame. The ribs need to be welded at a certain interval to avoid uneven stress on the ribs, which affects the overall service life and safety of the pallet. When welding the ribs, the ribs need to be manually placed in the appropriate position, and then welded by using welding equipment. However, manual placement of the ribs is limited by technical level, visual fatigue and other factors, and the precision is often low. If the error is too large, the ribs cannot be welded at the required interval, which affects the stress condition of the ribs in the later use, thereby reducing the use stability of the pallet. SUMMARY

[0004] Technical problem

[0005] In view of the above shortcomings of the prior art, the present application provides a logistics pallet welding production line based on a circulating feeding structure, which can effectively solve the problem of the prior art that manual placement of the ribs is limited by technical level, visual fatigue and other factors, and the precision is often low. If the error is too large, the ribs cannot be welded at the required interval, which affects the stress condition of the ribs in the later use, thereby reducing the use stability of the pallet.

[0006] To achieve the above purpose, the present application is realized by the following technical scheme:

[0007] The present application provides a logistics pallet welding production line based on a circulating feeding structure, comprising:

[0008] a welding part;

[0009] a placing part, the placing part comprising a rack, the top of the rack being provided with a sliding hole, the bottom of the rack being fixedly connected with a guide frame, the sliding hole and the guide frame being respectively provided with two and symmetrically distributed along the center of the rack, the bottom of the rack being provided with a limiting piece for adjusting the position of the ribs, and the limiting piece being provided with a plurality of groups and arrayed along the rack;

[0010] The limiting piece comprises a moving plate, the moving plate is slidably connected to the bottom of the rack through a guide block arranged on the top of the moving plate, the moving plate is slidably connected to the top of the moving plate through a guide rod arranged on the top of the moving plate, and a limiting plate is slidably connected to the side wall of the sliding hole.

[0011] The guide frame is internally provided with a driving piece for adjusting the position of the moving plate.

[0012] Further, a conveyor set is arranged inside the rack and used for conveying the tray guard frame.

[0013] Further, the driving piece comprises a support frame, the support frame is slidably connected in the guide frame, a rotating shaft is rotatably connected in the support frame, a rotating plate is fixedly connected to the top of the rotating shaft, a connecting rod is rotatably connected to the bottom of the moving plate, the connecting rod is arranged on two sides and symmetrically distributed along the center of the rotating plate, and a transmission gear is fixedly connected to the bottom of the rotating shaft.

[0014] Further, the support frame is fixedly connected to a heating pipe through a support arranged on the bottom of the support frame, and a heating coil is fixedly connected to the circumferential outer surface of the heating pipe.

[0015] The inner wall of the heating pipe is slidably connected to a movable block, the movable block is connected to the inner wall of the heating pipe through an elastic piece on the side close to the heating coil, and a rack is fixedly connected to the side away from the elastic piece of the movable block, the rack penetrates through the end of the heating pipe and is engaged with the transmission gear.

[0016] Further, the driving piece further comprises an adjusting mechanism for adjusting the position of the support frame.

[0017] The adjusting mechanism comprises a gear ring and a limiting ring frame, the gear ring is rotatably connected to the outer side of the support frame through a ring groove arranged on the circumferential outer surface of the gear ring, a guide column penetrating through the limiting ring frame is fixedly connected to the bottom end of the gear ring, the guide column is arranged in multiple and arrayed along the circumferential center of the gear ring, the bottom of the gear ring and the top of the limiting ring frame are connected through a spring, a limiting groove is arranged in the inner wall of the limiting ring frame, the limiting groove is arranged in multiple and arrayed along the circumferential of the limiting ring frame, an abutting block is fixedly connected to the inner wall of the limiting ring frame on the bottom of the support frame, and a limiting block is fixedly connected to the circumferential outer surface of the abutting block and matched with the inner wall of the limiting groove.

[0018] Further, the support frame top is provided with a cavity, and the cavity is provided with two and symmetrically distributed left and right of the support frame, the cavity is slidably connected with a locking block through a guide rail arranged on the side wall of the cavity, and the outer side of the locking block is connected with the inner wall of the cavity through a compression spring, the side of the locking block away from the compression spring is provided with a locking hole, the top of the cavity is rotatably connected with a rotating rod, and the bottom of the rotating rod is fixedly connected with an adjusting gear engaged with the gear ring, and the top of the rotating rod is rotatably connected with an extrusion block matched with the locking block.

[0019] Further, the guide frame is provided with a locking groove matched with the locking block, and the locking groove is provided with a locking block matched with the locking hole.

[0020] Further, the limit plate is internally fixedly connected with a counterweight, the bottom of the limit plate is designed as a slope, the top of the limit plate is rotatably connected with a roller, and the top of the moving plate is fixedly connected with a wedge matched with the slope of the limit plate.

[0021] The technical scheme provided by the present application has the following beneficial effects compared with the prior art:

[0022] The present application is provided with a limiting piece, and the two limit plates move towards each other to synchronously approach the reinforcing rib and fix it, so that the reinforcing rib can be placed between the two limit plates without the need for accurate adjustment of the distance by the staff, which facilitates the welding of the reinforcing rib by the welding part in the later stage, improves the work efficiency and the accuracy of welding, and the counterweight is fixedly installed in the limit plate, which can move synchronously with the moving plate when not in contact with the reinforcing rib, and when just in contact with the reinforcing rib, the slope of the limit plate will move upwards along the slope of the wedge until the limiting is completed, and since the initial position of the limit plate is in the sliding hole and slightly protrudes, the roller is installed on the top away from the reinforcing rib, which can be naturally transitioned when the protective frame approaches the limit plate, avoiding the hindering of the normal movement of the protective frame by the limit plate when the conveyor set moves the protective frame. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0024] Figure 1 It is a three-dimensional structural schematic view of the embodiment of the present application.

[0025] Figure 2 It is a bottom view of the rack of the embodiment of the present application.

[0026] Figure 3Structure schematic view of the embodiment of the present application in perspective of the guide frame;

[0027] Figure 4 Structure schematic view of the embodiment of the present application in perspective of the limiting member;

[0028] Figure 5 Structure schematic view of the embodiment of the present application in perspective of the guide frame; Figure 4 Structure schematic view of the embodiment of the present application in perspective of the guide frame;

[0029] Figure 6 Structure schematic view of the embodiment of the present application in perspective of the drive member;

[0030] Figure 7 Structure schematic view of the embodiment of the present application in perspective of the guide frame; Figure 6 Structure schematic view of the embodiment of the present application in perspective of the guide frame;

[0031] Figure 8 Structure schematic view of the embodiment of the present application in perspective of the guide frame;

[0032] Figure 9 Structure schematic view of the embodiment of the present application in perspective of the guide frame;

[0033] Figure 10 Structure schematic view of the embodiment of the present application in perspective of the guide frame; Figure 9 Structure schematic view of the embodiment of the present application in perspective of the guide frame;

[0034] Figure 11 Structure schematic view of the embodiment of the present application in perspective of the guide frame; Figure 3 Structure schematic view of the embodiment of the present application in perspective of the guide frame.

[0035] The reference signs in the drawings represent: 1, welding part; 2, placing part; 21, rack; 22, sliding hole; 23, guide frame; 231, locking groove; 232, locking block; 24, limiting member; 241, moving plate; 2411, wedge block; 242, limiting plate; 2421, counterweight block; 2422, roller; 25, drive member; 251, support frame; 2511, cavity; 2512, locking block; 2513, locking hole; 2514, rotating rod; 2515, adjusting gear; 2516, extrusion block; 252, rotating shaft; 253, rotating plate; 254, connecting rod; 255, transmission gear; 256, heating pipe; 2561, movable block; 2562, rack; 257, heating coil; 258, adjusting mechanism; 2581, gear ring; 2582, limiting ring frame; 2583, guide column; 2584, limiting groove; 2585, abutting block; 2586, limiting block; 26, conveyor unit. DETAILED DESCRIPTION

[0036] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0037] The present application will be further described below with reference to the embodiments. Embodiment:

[0038] Please refer to Figures 1-11 The present application provides a technical solution: a logistics tray welding production line based on a circulating feeding structure, comprising:

[0039] A welding part 1;

[0040] A placing part 2, the placing part 2 comprises a rack 21, the top of the rack 21 is provided with a sliding hole 22, the bottom of the rack 21 is fixedly connected with a guide frame 23, the sliding hole 22 and the guide frame 23 are respectively provided with two and are distributed symmetrically along the center of the rack 21, the bottom of the rack 21 is provided with a limiting piece 24 which can be used for adjusting the position of the rib, and the limiting piece 24 is provided with multiple groups and is arrayed along the rack 21;

[0041] The limiting piece 24 comprises a moving plate 241, the moving plate 241 is slidably connected to the bottom of the rack 21 through a guide block provided on the top of the moving plate 241, the moving plate 241 is slidably connected with a limiting plate 242 which is fitted with the side wall of the sliding hole 22 through a guide rod provided on the top of the moving plate 241, and the guide rod is slidably connected to the top of the moving plate 241;

[0042] The guide frame 23 is provided with a driving piece 25 which can be used for adjusting the position of the moving plate 241.

[0043] Further comprising a conveyor set 26, the conveyor set 26 is arranged in the interior of the rack 21 and is used for conveying the tray guard frame.

[0044] The driving piece 25 comprises a support frame 251, the support frame 251 is slidably connected in the guide frame 23, a rotating shaft 252 is rotatably connected in the support frame 251, a rotating plate 253 is fixedly connected to the top of the rotating shaft 252, connecting rods 254 which are rotatably connected with the bottom of the moving plate 241 are rotatably connected to the outer side of the rotating plate 253, the connecting rods 254 are provided with two and are symmetrically distributed along the center of the rotating plate 253, and a transmission gear 255 is fixedly connected to the bottom of the rotating shaft 252.

[0045] The support frame 251 is fixedly connected with a heating pipe 256 through a support provided on the bottom of the support frame 251, and the circumferential outer surface of the heating pipe 256 is fixedly connected with a heating coil 257;

[0046] The inner wall of the heating pipe 256 is slidingly connected with a movable block 2561, and the movable block 2561 is connected with the inner wall of the heating pipe 256 through an elastic element on the side close to the heating coil 257, and the side of the movable block 2561 away from the elastic element is fixedly connected with a rack 2562 penetrating through the end of the heating pipe 256 and meshing with the transmission gear 255.

[0047] The driving member 25 further comprises an adjusting mechanism 258 for adjusting the position of the support frame 251.

[0048] The adjusting mechanism 258 comprises a gear ring 2581 and a limiting ring frame 2582, the gear ring 2581 is rotatably connected outside the support frame 251 through the ring groove provided on the circumferential outer surface thereof, the bottom end of the gear ring 2581 is fixedly connected with a guide column 2583 penetrating through the limiting ring frame 2582, and the guide column 2583 is provided with a plurality of and is arrayed along the central circumference of the gear ring 2581, the bottom of the gear ring 2581 and the top of the limiting ring frame 2582 are connected through a spring, the inner wall of the limiting ring frame 2582 is provided with a limiting groove 2584, and the limiting groove 2584 is provided with a plurality of and is arrayed along the circumference of the limiting ring frame 2582, the bottom of the support frame 251 is fixedly connected with an abutting block 2585 abutting with the inner wall of the limiting ring frame 2582, and the circumferential outer surface of the abutting block 2585 is fixedly connected with a limiting block 2586 abutting with the inner wall of the limiting groove 2584.

[0049] The top of the support frame 251 is provided with a cavity 2511, and the cavity 2511 is provided with two and is symmetrically distributed along the left and right of the support frame 251, the cavity 2511 is slidingly connected with a locking block 2512 through the guide rail provided on the side wall thereof, and the outer side of the locking block 2512 is connected with the inner wall of the cavity 2511 through a compression spring, the side of the locking block 2512 away from the compression spring is provided with a locking hole 2513, the top of the cavity 2511 is rotatably connected with a rotating rod 2514, and the bottom of the rotating rod 2514 is fixedly connected with an adjusting gear 2515 meshing with the gear ring 2581, and the top of the rotating rod 2514 is rotatably connected with a pressing block 2516 abutting with the locking block 2512.

[0050] The guide frame 23 is provided with a locking groove 231 abutting with the locking block 2512, and the locking groove 231 is provided with a locking clamping block 232 abutting with the locking hole 2513.

[0051] The inner part of the limiting plate 242 is fixedly connected with a counterweight 2421, the bottom of the limiting plate 242 is designed as an inclined surface, the top end of the limiting plate 242 is rotatably connected with a roller shaft 2422, and the top of the moving plate 241 is fixedly connected with a wedge block 2411 abutting with the inclined surface of the limiting plate 242.

[0052] The principle and advantages of the logistics pallet welding production line based on the circulating feeding structure are as follows:

[0053] Positioning of the reinforcing bars:

[0054] In actual use, the staff uses external conveying mechanism to convey the tray guard frame to the top of the rack 21, so that the conveying mechanism set 26 at the top of the rack 21 can move the guard frame to the center position of the rack 21, at this time the staff can use other conveying mechanism to place the reinforcing bars to be welded in the guard frame.

[0055] It is worth noting that the conveying mechanism can be selected from a carrying robot, a belt conveyor and a roller conveyor, and one or more of the above can realize automatic feeding, which is beneficial to improve the processing efficiency of welding, and the rack 21 is provided with a correction mechanism, which can ensure that the guard frame can be in the center position of the rack 21 when the conveying mechanism set 26 conveys the tray guard frame, so as to avoid affecting the later welding. The conveying mechanism and the correction mechanism are both existing mature technologies.

[0056] After the guard frame and the reinforcing bars are placed, the heating coil 257 will start to work, which can heat the air inside the heating pipe 256 (the heating pipe 256 is made of heat-resistant material) to make the gas expand and move by pushing the movable block 2561, so as to realize the movement of the rack 2562. Since the rack 2562 and the transmission gear 255 are in meshing relationship, the shaft 252 will drive the rotating plate 253 to rotate synchronously, and in cooperation with the two center-symmetrically distributed connecting rods 254 on the surface of the rotating plate 253, the two moving plates 241 can move towards each other until the limiting plate 242 and the two sides of the reinforcing bars are in close contact. It is simple and convenient to operate, and at the same time, the electromagnetic valve installed at the top of the circumferential outer surface of the heating pipe 256 can exchange air according to the need, so as to change the gas pressure inside the heating pipe 256, which is beneficial to the reset of the movable block 2561 and the rack 2562.

[0057] When the limiting plate 242 is not in contact with the reinforcing rib, the moving direction of the limiting plate 242 is not hindered. Since the counterweight 2421 is fixedly installed in the limiting plate 242, the counterweight 2421 and the gravity of the limiting plate 242 itself can realize the synchronous movement of the limiting plate 242 with the moving plate 241. When the limiting plate 242 is just in contact with the two sides of the reinforcing rib, the limiting plate 242 is hindered by the reinforcing rib, but the moving plate 241 is still in the state of moving towards each other. At this time, the inclined surface of the limiting plate 242 will move upwards along the inclined surface of the wedge block 2411 until it moves to the maximum stroke of the guide rod (the clamping block between the guide rod and the limiting plate 242 will hinder the upward movement of the limiting plate 242 when the limiting plate 242 moves to the maximum stroke). At this time, the limiting plate 242 will protrude from the sliding hole 22, thereby completing the limiting of the reinforcing rib. Since the two limiting plates 242 move towards each other, the two limiting plates 242 can be synchronized to approach the reinforcing rib until the reinforcing rib is limited and fixed. It is only necessary to place the reinforcing rib between the two limiting plates 242, without the need for workers to accurately adjust the distance therebetween, thereby facilitating the welding of the reinforcing rib by the welding part 1 in the later stage. The welding part 1 is controlled by an external moving unit. When the reinforcing rib needs to be welded, the welding part 1 is moved close to the position to be welded by the external moving unit. At this time, the welding head in the welding part 1 can weld the reinforcing rib and the combined surface of the guard frame.

[0058] It is worth noting that the initial position of the limiting plate 242 is in the sliding hole 22, slightly protruding from the sliding hole 22. The limiting plate 242 is inside the sliding hole 22, and the roller 2422 is installed on the top of the limiting plate 242 away from the side of the reinforcing rib. When the guard frame approaches the limiting plate 242, the roller 2422 on the top of the limiting plate 242 can be used for natural transition, which can avoid the hindering of the limiting plate 242 to the normal movement of the guard frame when the conveyor unit 26 moves the guard frame. With the synchronous movement of the limiting plate 242 and the moving plate 241, the limiting plate 242 can be gradually moved upwards along the inclined surface of the wedge block 2411 until the limiting plate 242 moves to the maximum stroke. Through the extrusion between the wedge block 2411 and the inclined surface of the limiting plate 242, the limiting plate 242 can be firmly in contact with the side wall of the reinforcing rib, thereby avoiding the deviation of the reinforcing rib during the welding process.

[0059] The above scheme adopts the moving plate 241, the limiting plate 242 and the heating pipe 256, which has the following advantages:

[0060] The heating coil 257 pushes the movable block 2561 to move by expanding the air inside the heating pipe 256, and then the rack 2562 moves, drives the rotating shaft 252 and the rotating plate 253 to rotate, cooperates with the connecting rod 254 to move the two moving plates 241 towards each other, until the limiting plate 242 is attached to both sides of the reinforcing rib strip, and the limiting of the reinforcing rib strip is completed. The whole process is simple to operate, without complex operation steps, and the electromagnetic valve can exchange air as needed to change the gas pressure inside the heating pipe 256, ensuring normal operation and repeated use of the equipment, making the working process of the equipment more stable and reliable.

[0061] The second advantage is that the two limiting plates 242 can move towards each other to approach the reinforcing rib strip and fix it in position, and only need to place the reinforcing rib strip between the two limiting plates 242, without the need for workers to accurately adjust the distance, which facilitates the welding of the reinforcing rib strip by the welding part 1 in the later stage, and improves the work efficiency and welding accuracy.

[0062] The third advantage is that the counterweight 2421 is fixedly installed in the limiting plate 242, which can move synchronously with the moving plate 241 when not in contact with the reinforcing rib strip, and when just attached to the reinforcing rib strip, the inclined surface of the limiting plate 242 will move upwards along the inclined surface of the wedge block 2411 until the limiting is completed. Since the initial position of the limiting plate 242 is in the sliding hole 22 and slightly protrudes, and the top is away from the side of the reinforcing rib strip, when the guard frame approaches the limiting plate 242, the rolling shaft 2422 can be used for natural transition to avoid the limiting plate 242 hindering the normal movement of the guard frame when the conveyor set 26 moves.

[0063] Spacing adjustment of the limiting piece 24:

[0064] When welding the reinforcing bars with different spacings, the limiting ring frame 2582 is pressed, and the limiting ring frame 2582 moves along the guide column 2583, so that the limiting groove 2584 in the limiting ring frame 2582 is separated from the limiting block 2586 on the abutment plate. At this time, the limiting ring frame 2582 is rotated, and the gear ring 2581 is synchronously rotated. With the rotation of the gear ring 2581, the adjusting gear 2515 drives the rotating rod 2514 to rotate, and the extrusion block 2516 gradually separates from the locking block 2512. Under the cooperation of the compression spring, the locking block 2512 is separated from the locking groove 231. At this time, the support frame 251 loses the limitation, and the staff can freely adjust the position along the guide frame 23. After adjustment, the limiting ring frame 2582 is reversely rotated again, and the extrusion block 2516 pushes the locking block 2512 to abut with the locking groove 231 again, and the locking hole 2513 on the surface of the locking block 2512 is clamped with the locking block 232 in the guide frame 23. At this time, the limiting ring frame 2582 is loosened, and the limiting ring frame 2582 is reset under the action of the spring and clamped with the limiting block 2586 on the surface of the abutment block 2585, and the limiting and fixing of the support frame 251 are completed.

[0065] It is worth noting that the number of limiting members 24 is set to multiple groups, and the staff can set as needed. The two limiting plates 242 in each group of limiting members 24 move towards each other. When adjusting, the staff only needs to consider the distance between the center lines of the two support frames 251. When the limiting plate 242 limits the reinforcing bar, the center line of the reinforcing bar coincides with the center line of the support frame 251. Therefore, for different spacings of the reinforcing bars, the adjusting mechanism 258 can quickly adjust each group of limiting members 24. Compared with the traditional bolt fixing, the adjustment steps are simplified, and the adjustment efficiency is improved.

[0066] The above scheme adopts the adjusting mechanism 258, which has the following advantages:

[0067] Advantage one, through simple operations such as pressing the limiting ring frame 2582 and rotating the limiting ring frame 2582, the support frame 251 can be unlocked and quickly locked, which is convenient for position adjustment of the support frame 251. Compared with the traditional bolt fixing method, it is not necessary to tediously turn the bolt for disassembly and fixing, which greatly simplifies the adjustment steps, saves time and manpower, and improves the adjustment efficiency.

[0068] The second advantage is that the plurality of groups of the limiting pieces 24 are provided, and the two limiting plates 242 in each group of the limiting pieces 24 can move towards each other. The workers can quickly adjust each group of the limiting pieces 24 according to the different use intervals of the reinforcing rib strips, and can flexibly adapt to the requirements of various different intervals, have strong flexibility and adaptability. When the limiting plates 242 limit the reinforcing rib strips, the center lines of the reinforcing rib strips can coincide with the center lines of the supporting frames 251, the reinforcing rib strips can be accurately positioned, the accuracy of the installation positions of the reinforcing rib strips under different intervals is ensured, and the welding quality and the stability of the product are improved.

[0069] The above examples are only used to illustrate the technical solutions of the present application, but not to limit it. Although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced by equivalents. These modifications or replacements do not change the essence of the corresponding technical solutions out of the protection scope of the technical solutions of the embodiments of the present application.

Claims

1. A logistics pallet welding production line based on a circulating feeding structure, characterized in that, include: Welding part (1); The placement part (2) includes a frame (21), the top of the frame (21) is provided with a sliding hole (22), and the bottom of the frame (21) is fixedly connected with a guide frame (23). The sliding hole (22) and the guide frame (23) are provided in twos and are symmetrically distributed on the left and right sides of the center of the frame (21). The bottom of the frame (21) is provided with a limiting member (24) that can be used to adjust the position of the ribs, and the limiting member (24) is provided in multiple sets and is distributed in an array along the frame (21). The limiting member (24) includes a movable plate (241), which is slidably connected to the bottom of the frame (21) by a guide block set on its top. The movable plate (241) is slidably connected to a limiting plate (242) that fits against the side wall of the sliding hole (22) by a guide rod set on its top. The guide rod is slidably connected to the top of the movable plate (241). The guide frame (23) is provided with a drive component (25) for adjusting the position of the moving plate (241). The driving component (25) includes a support frame (251), which is slidably connected to the guide frame (23). A rotating shaft (252) is rotatably connected inside the support frame (251), and a rotating plate (253) is fixedly connected to the top of the rotating shaft (252). A connecting rod (254) is rotatably connected to the outside of the rotating plate (253) and is rotatably connected to the bottom of the moving plate (241). Two connecting rods (254) are provided and symmetrically distributed along the center of the rotating plate (253). A transmission gear (255) is fixedly connected to the bottom of the rotating shaft (252). A cavity (2511) is opened at the top of the support frame (251), and two connecting rods (254) are provided in the cavity (2511). The cavity (2511) is symmetrically distributed along the left and right sides of the support frame (251). A locking block (2512) is slidably connected to the cavity (2511) via a guide rail set on its side wall. The outer side of the locking block (2512) is connected to the inner wall of the cavity (2511) via a compression spring. A locking hole (2513) is opened on the side of the locking block (2512) away from the compression spring. A rotating rod (2514) is rotatably connected to the top of the cavity (2511). An adjusting gear (2515) that meshes with a gear ring (2581) is fixedly connected to the bottom of the rotating rod (2514). A pressing block (2516) that fits against the locking block (2512) is rotatably connected to the top of the rotating rod (2514). The drive unit (25) also includes an adjustment mechanism (258) for adjusting the position of the support frame (251); The adjusting mechanism (258) includes a gear ring (2581) and a limiting ring frame (2582). The gear ring (2581) is rotatably connected to the outside of the support frame (251) through an annular groove on its outer circumference. A guide post (2583) is fixedly connected to the bottom end of the gear ring (2581) through the limiting ring frame (2582). Multiple guide posts (2583) are arranged in an array along the central circumference of the gear ring (2581). The bottom of the gear ring (2581) and the limiting ring frame (2582) are connected. 582) The top is connected by a spring. The inner wall of the limiting ring frame (2582) is provided with a limiting groove (2584), and the limiting groove (2584) is provided with multiple grooves and distributed in an array along the circumference of the limiting ring frame (2582). The bottom of the support frame (251) is fixedly connected with an abutment block (2585) that fits against the inner wall of the limiting ring frame (2582), and the outer circumference of the abutment block (2585) is fixedly connected with a limiting block (2586) that fits against the inner wall of the limiting groove (2584).

2. The logistics pallet welding production line based on a circulating feeding structure according to claim 1, characterized in that: It also includes a conveyor unit (26), which is located inside the frame (21) and is used to convey pallet guard frames.

3. The logistics pallet welding production line based on a circulating feeding structure according to claim 1, characterized in that: The support frame (251) is fixedly connected to a heating tube (256) by a bracket set at its bottom, and a heating coil (257) is fixedly connected to the outer circumference of the heating tube (256). The inner wall of the heating tube (256) is slidably connected to a movable block (2561), and the movable block (2561) is connected to the inner wall of the heating tube (256) via an elastic element on the side of the movable block (2561) away from the elastic element. A rack (2562) is fixedly connected to the side of the movable block (2561) that passes through the end of the heating tube (256) and meshes with the transmission gear (255).

4. The logistics pallet welding production line based on a circulating feeding structure according to claim 1, characterized in that: The guide frame (23) is provided with a locking groove (231) that fits with the locking block (2512), and the locking groove (231) is provided with a locking block (232) that fits with the locking hole (2513).

5. A logistics pallet welding production line based on a circulating feeding structure according to claim 1, characterized in that: The limiting plate (242) is fixedly connected to a counterweight (2421). The bottom of the limiting plate (242) is designed with an incline. The top of the limiting plate (242) is rotatably connected to a roller (2422). The top of the moving plate (241) is fixedly connected to a wedge (2411) that fits against the incline of the limiting plate (242).

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