Logistics tray welding production line based on circulating type feeding structure

Abstract

The invention relates to the technical field of welding, and discloses a logistics tray welding production line based on a circulating type feeding structure. The placing part comprises a machine frame, sliding holes are formed in the top of the machine frame, guide frames are fixedly connected to the bottom of the machine frame, the two sliding holes and the two guide frames are symmetrically distributed left and right along the center of the machine frame, and limiting pieces used for adjusting the positions of the ribs are arranged at the bottom of the machine frame and comprise moving plates; the movable plate is slidably connected to the bottom of the rack through a guide block arranged on the top of the movable plate. According to the logistics tray welding production line based on the circulating type feeding structure, the problems that in the prior art, manual rib placing is limited by factors such as the technical level and visual fatigue, precision is often low, errors are too large, consequently, ribs cannot be welded according to the needed intervals, the stress condition of the ribs in later use is affected, and the welding quality is affected can be effectively solved. Therefore, the use stability of the tray is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of welding, and in particular to a logistics pallet welding production line based on a cyclic feeding structure. Background Art

[0002] Logistics pallets are a type of cargo-carrying tool widely used in the logistics industry. They are usually made of high-strength aluminum alloy or other metal materials. High-strength aluminum alloy has the characteristics of light weight, high strength and corrosion resistance. Aluminum alloy pallets mainly include frames, longitudinal support bars and support seats. The frames constitute the outer frame of the pallet, which plays an overall definition and protection role. The longitudinal support bars are distributed in the frames and are used to carry goods.

[0003] In the prior art, in order to ensure the stability of the pallet structure, multiple groups of reinforcing ribs are provided on the support bars, and each rib that contacts the guard frame needs to be welded. The ribs need to be welded at a certain interval to avoid uneven force 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 appropriate positions and then welded using welding equipment. However, the manual placement of the ribs is limited by factors such as technical level and visual fatigue, and the accuracy is often low. Excessive errors will cause the ribs to fail to be welded at the required intervals, affecting the force on the ribs during later use, thereby reducing the stability of the pallet. Summary of the invention

[0004] Technical issues solved In view of the above-mentioned shortcomings of the prior art, the present invention provides a logistics pallet welding production line based on a circulating feeding structure, which can effectively solve the problem in the prior art that the manual placement of ribs is limited by factors such as technical level and visual fatigue, and the accuracy is often low. Excessive errors will cause the ribs to fail to be welded at the required spacing, affecting the stress conditions of the ribs in the later use, thereby reducing the stability of the pallet.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: The present invention provides a logistics pallet welding production line based on a cyclic feeding structure, comprising: Welding department; A placement part, the placement part includes a frame, a sliding hole is opened on the top of the frame, a guide frame is fixedly connected to the bottom of the frame, two sliding holes and two guide frames are respectively provided and are symmetrically distributed along the center of the frame, and a limiter that can be used to adjust the position of the rib is provided at the bottom of the frame, and the limiter is provided in multiple groups and distributed along the frame array; Wherein, the limiting member comprises a moving plate, the moving plate is slidably connected to the bottom of the frame through a guide block arranged at the top thereof, the moving plate is slidably connected to a limiting plate affixed to the side wall of the sliding hole through a guide rod arranged at the top thereof, and the guide rod is slidably connected to the top of the moving plate; Wherein, a driving member which can be used to adjust the position of the movable plate is arranged in the guide frame.

[0006] Furthermore, it also includes a conveyor unit, which is arranged inside the frame and is used to convey the pallet guard frame.

[0007] Furthermore, the driving member includes a support frame, which is slidably connected in the guide frame, a rotating shaft is rotatably connected in the support frame, and a rotating plate is fixedly connected to the top of the rotating shaft, a connecting rod is rotatably connected to the outer side of the rotating plate and is rotatably connected to the bottom of the movable plate, and two connecting rods are provided and symmetrically distributed along the center of the rotating plate, and a transmission gear is fixedly connected to the bottom of the rotating shaft.

[0008] Furthermore, the support frame is fixedly connected to a heating tube via a bracket arranged at the bottom thereof, and a heating coil is fixedly connected to the circumferential outer surface of the heating tube; A movable block is slidably connected to the inner wall of the heating tube, and the movable block is connected to the inner wall of the heating tube through an elastic member on the side close to the heating coil, and a rack penetrating the end of the heating tube and meshing with the transmission gear is fixedly connected to the movable block away from the elastic member.

[0009] Furthermore, the driving member further comprises an adjusting mechanism for adjusting the position of the supporting frame; The adjusting mechanism comprises a gear ring and a limiting ring frame, the gear ring is rotatably connected to the outside of the support frame through a ring groove arranged on its circumferential outer surface, the bottom end of the gear ring is fixedly connected with a guide column penetrating the limiting ring frame, and the guide column is provided with a plurality of columns and distributed in an array along the central circumference of the gear ring, the bottom of the gear ring and the top of the limiting ring frame are connected through a spring, the inner wall of the limiting ring frame is provided with a limiting groove, and the limiting groove is provided with a plurality of columns and distributed in an array along the circumference of the limiting ring frame, the bottom of the support frame is fixedly connected with an abutment block which fits with the inner wall of the limiting ring frame, and the circumferential outer surface of the abutment block is fixedly connected with a limiting block which fits with the inner wall of the limiting groove.

[0010] Furthermore, a cavity is provided at the top of the support frame, and the cavity is provided with two cavities and is symmetrically distributed along the left and right sides of the support frame. The cavity is slidably connected to a locking block through a guide rail arranged on its side wall, and the outer side of the locking block is connected to the inner wall of the cavity through a compression spring, and a locking hole is provided on the side of the locking block away from the compression spring, the top of the cavity is rotatably connected to a rotating rod, and the bottom of the rotating rod is fixedly connected to an adjusting gear meshing with a gear ring, and the top of the rotating rod is rotatably connected to an extrusion block that fits with the locking block.

[0011] Furthermore, a locking groove which fits with the locking block is provided in the guide frame, and a locking block which fits with the locking hole is provided in the locking groove.

[0012] Furthermore, a counterweight is fixedly connected inside the limit plate, the bottom of the limit plate is designed to be inclined, the top of the limit plate is rotatably connected to a roller, and the top of the movable plate is fixedly connected to a wedge block that fits the inclined surface of the limit plate.

[0013] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects: The present invention provides a limiting piece, and the two limiting plates can move towards each other to synchronously approach the reinforcing rib and limit and fix it. The reinforcing rib only needs to be placed between the two limiting plates, and there is no need for the staff to accurately adjust the spacing, 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 a counterweight block is fixedly installed in the limiting plate, which can move synchronously with the moving plate when it is not in contact with the reinforcing rib, and when it is just in contact with the reinforcing rib, the inclined surface of the limiting plate will move upward along the inclined surface of the wedge block until the limiting is completed. Since the initial position of the limiting plate is in the sliding hole and slightly protrudes out, a roller is installed on the top side away from the reinforcing rib, when the guard frame approaches the limiting plate, the roller can be used for natural transition, so as to avoid the limiting plate hindering the normal movement of the guard frame when the conveyor unit moves the guard frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0015] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a frame in a bottom-up plan view according to an embodiment of the present invention; Figure 3 It is a three-dimensional structural schematic diagram of a guide frame according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the three-dimensional separation of the limiting member according to an embodiment of the present invention; Figure 5 For the embodiment of the present invention Figure 4 A schematic diagram of the structure enlargement in the middle; Figure 6 This is a schematic diagram of the structure of the three-dimensional separation of the driving parts in an embodiment of the present invention; Figure 7 For the embodiment of the present invention Figure 6 A magnified schematic diagram of the structure at B in the middle; Figure 8 This is a schematic diagram of the cross-sectional structure of a heating tube according to an embodiment of the present invention; Fig. 9 This is a schematic cross-sectional structural diagram of a support frame according to an embodiment of the present invention; Fig.10 For the embodiment of the present invention Fig. 9 A magnified schematic diagram of the structure at C in the middle; Fig.11 For the embodiment of the present invention Figure 3 Enlarged schematic diagram of the structure at point D in the middle.

[0016] The numbers in the figure represent: 1, welding part; 2, placement part; 21, frame; 22, sliding hole; 23, guide frame; 231, locking groove; 232, locking block; 24, limiter; 241, moving plate; 2411, wedge block; 242, limiter plate; 2421, counterweight block; 2422, roller; 25, driving 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 tube; 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, abutment block; 2586, limiting block; 26, conveyor unit. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] The present invention will be further described below in conjunction with the embodiments. Example

[0019] See also Figure 1-Figure 11 The present invention provides a technical solution: a logistics pallet welding production line based on a circulating feeding structure, comprising: Welding part 1; The placing part 2 includes a frame 21, a sliding hole 22 is provided on the top of the frame 21, a guide frame 23 is fixedly connected to the bottom of the frame 21, two sliding holes 22 and two guide frames 23 are respectively provided and are symmetrically distributed along the center of the frame 21, and a limiting member 24 for adjusting the position of the rib is provided at the bottom of the frame 21, and the limiting member 24 is provided in multiple groups and is distributed in an array along the frame 21; The limiting member 24 includes a moving plate 241, which is slidably connected to the bottom of the frame 21 through a guide block arranged at the top thereof, and the moving plate 241 is slidably connected to a limiting plate 242 that fits the side wall of the sliding hole 22 through a guide rod arranged at the top thereof, and the guide rod is slidably connected to the top of the moving plate 241; A driving member 25 for adjusting the position of the movable plate 241 is disposed in the guide frame 23 .

[0020] The machine frame 21 further comprises a conveyor unit 26 , which is arranged inside the frame 21 and is used for conveying the pallet guard frame.

[0021] The driving member 25 includes a support frame 251, which is slidably connected in the guide frame 23. A rotating shaft 252 is rotatably connected in the support frame 251, and a rotating plate 253 is fixedly connected to the top of the rotating shaft 252. A connecting rod 254 rotatably connected to the bottom of the moving plate 241 is rotatably connected to the outer side of the rotating plate 253, and the connecting rod 254 is provided with two 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.

[0022] The support frame 251 is fixedly connected to a heating tube 256 via a bracket arranged at the bottom thereof, and a heating coil 257 is fixedly connected to the outer circumferential surface of the heating tube 256; A movable block 2561 is slidably connected to the inner wall of the heating tube 256, and the movable block 2561 is connected to the inner wall of the heating tube 256 through an elastic member on the side close to the heating coil 257, and the movable block 2561 is fixedly connected to a rack 2562 that passes through the end of the heating tube 256 and meshes with the transmission gear 255 on the side away from the elastic member.

[0023] The driving member 25 further includes an adjustment mechanism 258 for adjusting the position of the support frame 251; The adjusting mechanism 258 comprises 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 a ring groove arranged on its circumferential outer surface. A guide column 2583 penetrating the limiting ring frame 2582 is fixedly connected to the bottom end of the gear ring 2581, and a plurality of the guide columns 2583 are arranged and distributed in an array 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 by a spring. A limiting groove 2584 is arranged on the inner wall of the limiting ring frame 2582, and a plurality of the limiting grooves 2584 are arranged and distributed in an array along the circumference of the limiting ring frame 2582. A contact block 2585 fitting with the inner wall of the limiting ring frame 2582 is fixedly connected to the bottom of the support frame 251, and a limiting block 2586 fitting with the inner wall of the limiting groove 2584 is fixedly connected to the circumferential outer surface of the abutment block 2585.

[0024] A cavity 2511 is provided at the top of the support frame 251, and the cavity 2511 is provided with two cavities and symmetrically distributed along the left and right sides of the support frame 251. The cavity 2511 is slidably connected to a locking block 2512 through a guide rail arranged on its side wall, and the outer side of the locking block 2512 is connected to the inner wall of the cavity 2511 through a compression spring, and a locking hole 2513 is provided 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, and an adjusting gear 2515 meshing with the gear ring 2581 is fixedly connected to the bottom of the rotating rod 2514, and an extrusion block 2516 that fits the locking block 2512 is rotatably connected to the top of the rotating rod 2514.

[0025] A locking groove 231 is disposed in the guide frame 23 and is fitted with the locking block 2512 . A locking block 232 is disposed in the locking groove 231 and is fitted with the locking hole 2513 .

[0026] A counterweight 2421 is fixedly connected inside the limiting plate 242 , the bottom of the limiting plate 242 is designed to be inclined, the top of the limiting plate 242 is rotatably connected to a roller 2422 , and the top of the movable plate 241 is fixedly connected to a wedge block 2411 that fits the inclined surface of the limiting plate 242 .

[0027] The principle and advantages of the logistics pallet welding production line based on the circulating feeding structure: Positioning of reinforcing ribs: During actual use, the staff uses an external conveying mechanism to convey the pallet guard frame to the top of the rack 21, so that the conveyor group 26 on 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 mechanisms to place the reinforcing ribs to be welded in the guard frame.

[0028] It is worth mentioning that the conveying mechanism can be a handling robot, a belt conveyor, a roller conveyor, etc., and automatic loading can be achieved by using one or more of the above-mentioned means, which is beneficial to improving the welding processing efficiency. A correction mechanism is provided on the frame 21 to ensure that when the conveyor group 26 transports the pallet guard frame, the guard frame can be in the center position of the frame 21 to avoid affecting the subsequent welding. The above-mentioned conveying mechanism and correction mechanism are both existing mature technologies.

[0029] After the protective frame and the reinforcing ribs are placed, the heating coil 257 will start to work, and can heat the internal air of the heating tube 256 (the heating tube 256 is made of heat-resistant material) to expand the gas, and push the movable block 2561 to move, thereby realizing the movement of the rack 2562. Since the rack 2562 and the transmission gear 255 are meshed with each other, the rotating shaft 252 will drive the rotating plate 253 to rotate synchronously, and cooperate with the two connecting rods 254 symmetrically distributed on the surface of the rotating plate 253, the two movable plates 241 can move toward each other until the limit plate 242 and the two sides of the reinforcing rib are in contact with each other, which is simple and convenient to operate. At the same time, the solenoid valve installed on the top of the outer surface of the circumference of the heating tube 256 can exchange air as needed, thereby changing the gas pressure inside the heating tube 256, which is conducive to the movable block 2561 driving the rack 2562 to reset.

[0030] When the limit plate 242 is not in contact with the reinforcing rib, the movement direction of the limit plate 242 is not hindered. Since a counterweight block 2421 is fixedly installed inside the limit plate 242, the gravity of the counterweight block 2421 and the limit plate 242 can realize the synchronous movement of the limit plate 242 following the movable plate 241. When the limit plate 242 is just in contact with the two sides of the reinforcing rib, the limit plate 242 is hindered by the reinforcing rib, but the movable plate 241 is still in a state of moving towards each other. At this time, the inclined surface of the limit plate 242 will move upward along the inclined surface of the wedge block 2411 until it moves to the maximum stroke of the guide rod (there is a block between the guide rod and the limit plate 242. When the limit plate 242 moves to the maximum stroke, the block will hinder the limit plate 242 from moving upward). At this time, the limit plate 242 will extend out of the sliding hole 22, thereby completing the limitation of the reinforcing rib. Since the two limit plates 242 move toward each other, the two limit plates 242 can be simultaneously close to the reinforcing ribs until the reinforcing ribs are limited and fixed. The reinforcing ribs only need to be placed between the two limit plates 242, and the staff does not need to accurately adjust the distance between them, which facilitates the subsequent welding of the reinforcing ribs by the welding section 1. The welding section 1 is controlled by an external mobile unit. When the reinforcing ribs need to be welded, the external mobile unit moves the welding section 1 close to the position to be welded. At this time, the welding head in the welding section 1 can weld the joint surface of the reinforcing ribs and the guard frame.

[0031] It is worth noting that the initial position of the limit plate 242 is in the slide hole 22, slightly protruding from the slide hole 22, the limit plate 242 is inside the slide hole 22, and a roller 2422 is installed on the top of the limit plate 242 away from the reinforcing rib. When the guard frame approaches the limit plate 242, the roller 2422 on the top of the limit plate 242 can be used for natural transition, which can prevent the limit plate 242 from hindering the normal movement of the guard frame when the conveyor unit 26 moves the guard frame. With the synchronous movement of the limit plate 242 and the moving plate 241, the limit plate 242 will be hindered by the reinforcing rib, and then the limit plate 242 can gradually move upward along the inclined surface of the wedge block 2411 until the limit plate 242 moves upward to the maximum stroke. Due to the extrusion between the wedge block 2411 and the inclined surface of the limit plate 242, the limit plate 242 can fit firmly with the side wall of the reinforcing rib, avoiding the displacement of the reinforcing rib during welding.

[0032] The above solution uses the movable plate 241, the limiting plate 242 and the heating tube 256, which has the following advantages: Advantage 1: The heating coil 257 expands the air inside the heating tube 256 to push the movable block 2561 to move, thereby realizing the movement of the rack 2562, driving the rotating shaft 252 and the rotating plate 253 to rotate, and cooperating with the connecting rod 254 to make the two movable plates 241 move toward each other until the limit plate 242 fits with the two sides of the reinforcing rib to complete the limiting of the reinforcing rib. The whole process is simple to operate and does not require complicated operating steps. In addition, the solenoid valve can exchange air as needed, thereby changing the gas pressure inside the heating tube 256, ensuring the normal operation and repeated use of the equipment, and making the working process of the equipment more stable and reliable.

[0033] Advantage two, the two limit plates 242 can move toward each other to synchronously approach the reinforcing ribs and limit and fix them. The reinforcing ribs only need to be placed between the two limit plates 242, and the staff does not need to accurately adjust the spacing, which facilitates the welding of the reinforcing ribs in the later welding section 1 and improves work efficiency and welding accuracy.

[0034] Advantage three, a counterweight block 2421 is fixedly installed in the limit plate 242, and when it is not in contact with the reinforcing ribs, it can move synchronously with the movable plate 241. When it is just in contact with the reinforcing ribs, the inclined surface of the limit plate 242 will move upward along the inclined surface of the wedge block 2411 until the limit is completed. Since the initial position of the limit plate 242 is in the sliding hole 22 and slightly protrudes out, a roller 2422 is installed on the top side away from the reinforcing ribs. When the guard frame approaches the limit plate 242, the roller 2422 can be used for a natural transition to avoid the limit plate 242 hindering the normal movement of the guard frame when the conveyor unit 26 moves the guard frame.

[0035] Spacing adjustment of the limiter 24: When welding reinforcing ribs with different spacings, by pressing the limiting ring frame 2582, the limiting ring frame 2582 will move along the guide column 2583, so that the limiting groove 2584 in the limiting ring frame 2582 will separate from the limiting block 2586 on the abutment plate. At this time, the limiting ring frame 2582 is rotated, and then the ring gear 2581 will rotate synchronously. With the rotation of the ring gear 2581, the adjusting gear 2515 will drive the rotating rod 2514 to rotate, and then the extruding block 2516 will gradually separate from the locking block 2512. Under the cooperation of the compression spring, the locking block 2512 will separate from the locking groove 231. The support frame 251 is free from restriction, and the staff can freely adjust its position along the guide frame 23. After the adjustment is completed, the limiting ring frame 2582 is rotated in the opposite direction again, and then the extrusion block 2516 will push the locking block 2512 to fit with the locking groove 231 again, and the locking hole 2513 on the surface of the locking block 2512 will engage with the locking block 232 in the guide frame 23. At this time, the limiting ring frame 2582 is released, and the limiting ring frame 2582 will reset under the action of the spring, and engage with the limiting block 2586 on the surface of the abutment block 2585, thereby completing the limiting fixation of the support frame 251.

[0036] It is worth mentioning that there are multiple groups of limit members 24, which can be set by the staff as needed. The two limit plates 242 in each group of limit 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 limit plate 242 limits the reinforcing ribs, the center line of the reinforcing ribs coincides with the center line of the support frame 251. Therefore, according to the different usage spacing of the reinforcing ribs, the adjustment mechanism 258 can be used to quickly adjust each group of limit members 24. Compared with traditional bolt fixing, the simplified adjustment steps improve the efficiency of adjustment.

[0037] The above scheme adopts the adjustment mechanism 258, which has the following advantages: Advantage 1: Through simple operations such as pressing the limit ring frame 2582 and rotating the limit 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, there is no need to tediously twist the bolts for disassembly and fixing, which greatly simplifies the adjustment steps, saves time and manpower, and improves the adjustment efficiency.

[0038] Advantage two, there are multiple groups of limit members 24, and the two limit plates 242 in each group of limit members 24 can move toward each other. The staff can quickly adjust each group of limit members 24 as needed according to the different usage spacings of the reinforcing ribs, and can flexibly adapt to the requirements of various different spacings. It has strong flexibility and adaptability. When the limit plate 242 limits the reinforcing ribs, the center line of the reinforcing ribs can coincide with the center line of the support frame 251, and the reinforcing ribs can be accurately positioned, ensuring the accuracy of the installation position of the reinforcing ribs at different spacings, which is beneficial to improving welding quality and product stability.

[0039] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A logistics pallet welding production line based on a circulating feeding structure, characterized in that: include: Welding part (1); A placement portion (2), the placement portion (2) comprising a frame (21), a sliding hole (22) being provided at the top of the frame (21), a guide frame (23) being fixedly connected to the bottom of the frame (21), two sliding holes (22) and two guide frames (23) being provided respectively and being symmetrically distributed along the center of the frame (21), a limiting member (24) being provided at the bottom of the frame (21) and being used for adjusting the position of the ribs, and a plurality of groups of the limiting members (24) being provided and being distributed in an array along the frame (21); The limiting member (24) comprises a movable plate (241), the movable plate (241) being slidably connected to the bottom of the frame (21) via a guide block arranged at the top thereof, the movable plate (241) being slidably connected to a limiting plate (242) abutting against a side wall of the sliding hole (22) via a guide rod arranged at the top thereof, and the guide rod being slidably connected to the top of the movable plate (241); Wherein, a driving member (25) which can be used to adjust the position of the movable plate (241) is provided in the guide frame (23).

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

3. According to claim 1, a logistics pallet welding production line based on a circulating feeding structure is characterized in that: The driving member (25) comprises a support frame (251), the support frame (251) being slidably connected in the guide frame (23), a rotating shaft (252) being rotatably connected in the support frame (251), a rotating plate (253) being fixedly connected to the top of the rotating shaft (252), a connecting rod (254) being rotatably connected to the outer side of the rotating plate (253) and being rotatably connected to the bottom of the moving plate (241), two connecting rods (254) being provided and symmetrically distributed along the center of the rotating plate (253), and a transmission gear (255) being fixedly connected to the bottom of the rotating shaft (252).

4. According to claim 3, a logistics pallet welding production line based on a circulating feeding structure is characterized in that: The support frame (251) is fixedly connected to a heating tube (256) via a bracket arranged at the bottom thereof, and a heating coil (257) is fixedly connected to the circumferential outer surface 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 member on a side close to the heating coil (257), and the movable block (2561) is fixedly connected to a rack (2562) that penetrates the end of the heating tube (256) and meshes with the transmission gear (255) on a side away from the elastic member.

5. According to claim 1, a logistics pallet welding production line based on a circulating feeding structure is characterized in that: The driving member (25) further comprises an adjusting mechanism (258) for adjusting the position of the supporting frame (251); The adjustment mechanism (258) comprises 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) via a ring groove arranged on the outer surface of the circumference thereof; a guide column (2583) penetrating the limiting ring frame (2582) is fixedly connected to the bottom end of the gear ring (2581); and the guide column (2583) is provided with a plurality of guide columns (2583) and is distributed 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 to each other. The top of the support frame (251) 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 a plurality of limiting 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 the inner wall of the limiting ring frame (2582), and the circumferential outer surface of the abutment block (2585) is fixedly connected with a limiting block (2586) that fits the inner wall of the limiting groove (2584).

6. The logistics pallet welding production line based on the circulating feeding structure according to claim 5 is characterized in that: The support frame (251) has a cavity (2511) at the top, and the cavity (2511) has two cavities (2511) that are symmetrically distributed along the support frame (251). The cavity (2511) is slidably connected to a locking block (2512) via a guide rail arranged on its side wall, and the outer side of the locking block (2512) is connected to the inner wall of the cavity (2511) via a compression spring. The locking block (2512) has a locking hole (2513) at a side away from the compression spring. The top of the cavity (2511) is rotatably connected to a rotating rod (2514), and the bottom of the rotating rod (2514) is fixedly connected to an adjusting gear (2515) that meshes with the gear ring (2581), and the top of the rotating rod (2514) is rotatably connected to an extrusion block (2516) that fits the locking block (2512).

7. According to claim 1, a logistics pallet welding production line based on a circulating feeding structure is 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 clamping block (232) that fits with the locking hole (2513).

8. According to claim 1, a logistics pallet welding production line based on a circulating feeding structure is characterized in that: A counterweight block (2421) is fixedly connected inside the limiting plate (242), the bottom of the limiting plate (242) is designed to be inclined, the top of the limiting plate (242) is rotatably connected to a roller (2422), and the top of the movable plate (241) is fixedly connected to a wedge block (2411) that fits the inclined surface of the limiting plate (242).

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