Empty pallet stacker

Abstract

The utility model provides a kind of empty board stacking machine, including workbench and stacking part, first guide rail is arranged on workbench, the end of first guide rail is arranged under unloading part and liftable first translation guide rail, the guide rail of first translation guide rail is towards the second guide rail of first guide rail end side, after empty pallet is transported to end unloading part by first guide rail, first translation guide rail can be lifted to flush with first guide rail to receive empty pallet upwards, then empty pallet is transported to second guide rail transversely by the transmission of its guide rail;Stacking part is arranged at the end of third guide rail, and bidirectional movement structure is arranged on stacking part.The utility model, by setting stacking part, the recycling and vertical stacking of empty pallet are completed.The whole process does not need manual intervention, and empty pallet can be realized along the continuous stacking of vertical direction, and the vertical stacking efficiency is greatly improved, and it is ensured that the empty pallet after stacking is arranged neatly in vertical direction, and subsequent unified storage and use are facilitated.

Description

Technical Field

[0001] This utility model relates to the field of empty board stacking technology, specifically to an empty board stacking machine. Background Technology

[0002] In modern manufacturing and logistics warehousing, pallets serve as crucial tools for carrying and transferring goods. Their recycling, sorting, and reuse are essential for ensuring production continuity and reducing material costs. After unloading, a large number of empty pallets are generated. If these empty pallets are not efficiently recycled and neatly stored in a timely manner, they will not only occupy valuable space in workshops or warehouses but also lead to a chaotic work environment.

[0003] In traditional empty pallet recycling operations, the stacking and sorting processes mostly rely on manual labor. Workers must first move the scattered empty pallets one by one to the designated stacking area, and then manually adjust the position and orientation of the empty pallets to make them stacked neatly layer by layer. This process is inefficient and cannot meet the empty pallet recycling needs of large-scale production or logistics scenarios. It also requires a large amount of human resources to be dedicated to empty pallet handling and stacking, which significantly increases the company's labor costs. At the same time, manual stacking is prone to errors that can cause the empty pallets to be misaligned between layers and the stack to be tilted. This not only affects the neatness of storage, but may also cause the empty pallets to tip over and slide due to unstable stacking, posing a safety hazard. Utility Model Content

[0004] The purpose of this invention is to provide an empty plate stacker to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] An empty board stacker includes:

[0007] A workbench is provided with a first guide rail. Below the unloading section at the end of the first guide rail, a first translational guide rail that can be raised and lowered is provided. The guide rail of the first translational guide rail faces the second guide rail on the side of the end of the first guide rail. After the empty cargo plate is transported to the unloading section at the end via the first guide rail, the first translational guide rail can be raised and lowered to be flush with the first guide rail to receive the empty cargo plate. Then, the empty cargo plate is transported laterally to the second guide rail through its own guide rail transmission.

[0008] A liftable second translation guide rail is arranged below the end of the second guide rail, the guide way of the second translation guide rail faces a third guide rail at a side of the end of the second guide rail. When an empty pallet is conveyed to the end of the second guide rail, the second translation guide rail is lifted and lowered to be flush with the second guide rail to receive the empty pallet, and then transversely transfers the empty pallet to the third guide rail by means of its own guide rail transmission. In the whole conveying process, the empty pallet can complete continuous transfer from the first guide rail to the second guide rail and then to the third guide rail without changing its own orientation, which effectively improves the continuity and efficiency of empty pallet conveying; in the transfer process, the empty pallet can complete the continuous transfer from the first guide rail to the second guide rail and then to the third guide rail without changing its own orientation;

[0009] A stacking part, wherein the stacking part is arranged at the end of the third guide rail, and a bidirectional moving structure is arranged on the stacking part, and the empty pallet is lifted to a certain height by a vertical lifting action, so that a newly conveyed empty pallet can be stably placed below the stacked empty pallets.

[0010] Preferably, the bidirectional moving structure comprises a stacking bracket, the stacking bracket is of a C-shaped structure with an opening arranged upward, the bottom of the stacking bracket is fixedly arranged in an area below the third guide rail to form stable support, a stacking guide rail is arranged on the upper end face of the bottom of the stacking bracket, and the bottoms of two side moving plates are respectively slidably assembled on the stacking guide rail, so that horizontal movement along the stacking guide rail can be realized.

[0011] Preferably, a second lifting module is installed on the inner side of the moving plate, an output end of the second lifting module is horizontally connected with a row of stacking forks, the extending direction of the stacking forks faces the third guide rail, and a plurality of stacking forks are distributed in parallel at equal intervals. By means of the second lifting module, the row of stacking forks can be controlled to synchronously lift in the vertical direction, so as to realize lifting of the empty pallet, and the position adjustment requirement during empty pallet stacking is met by matching with the movement of the moving plate along the stacking guide rail.

[0012] Preferably, a gear box is fixedly connected to the center of the upper end face of the bottom of the stacking bracket, a front input end of the gear box is connected with a speed reducing motor, two side output ends of the gear box are rotatably connected with screw rods, the screw rods on two sides are provided with symmetrically distributed threads with opposite rotating directions, and the thread sections at two ends of the screw rods respectively penetrate through and are in threaded connection with the bottoms of the moving plates on two sides, the stacking guide rails are respectively located on two sides of the screw rods. When the speed reducing motor is started and drives the screw rods to rotate through the gear box, under the transmission action of the opposite symmetric threads at two ends of the screw rods, the moving plates on two sides can be driven to synchronously move in opposite directions at the same speed along the stacking guide rails on the upper end face of the bottom of the stacking bracket, so that the stacking forks on two sides can be driven to move inward close to or outward away from each other, which meets the position adjustment requirements during empty pallet forking and stacking.

[0013] Preferably, guide rail grooves are provided on both sides of the first guide rail, and a first chain is provided in each guide rail groove. The first chain extends along the length direction of the first guide rail, and both ends of the first chain are respectively connected to a driven sprocket. The driven sprocket is rotatably connected to the inner wall of the guide rail groove on both sides.

[0014] Preferably, a drive sprocket is provided at the middle position of the first chain. The axle of the drive sprocket passes laterally through both sides of the guide rail groove, and the drive sprocket meshes with the first chain for transmission. The drive sprocket is rotatably connected to the output shaft of the guide rail motor. The guide rail motor is fixedly connected to the side of the first guide rail housing through a motor bracket. When the guide rail motor is started, its output shaft can directly drive the drive sprocket to rotate, thereby driving the first chain to circulate along the guide rail groove. With the help of the friction between the first chain and the bottom of the empty cargo plate, the empty cargo plate is stably transported along the first guide rail. The first chains in the guide rail grooves on both sides of the first guide rail are symmetrically distributed, and the driven sprockets at both ends of the first chains on both sides are coaxially connected by a connecting rod. The connecting rod passes laterally through the guide rail groove walls on both sides of the first guide rail, and the connecting rod is fixedly connected to the driven sprocket. When one driven sprocket rotates, it can synchronously drive the driven sprocket at the corresponding position on the other side to rotate through the connecting rod. Only the middle part of the first chain on the right side is provided with a drive sprocket and a guide rail motor.

[0015] Preferably, a second chain is provided in the guide groove of the first translational guide rail, a third chain is provided in the guide groove of the second guide rail, a fourth chain is provided in the guide groove of the second translational guide rail, and a fifth chain is provided in the guide groove of the third guide rail; the second, third, fourth, and fifth chains have the same structure as the first chain, and are all paired with a driven sprocket, a connecting rod, and a single-sided driving sprocket and a guide rail motor, and the length of the chain matches the length of the guide groove of the corresponding guide rail or translational guide rail.

[0016] Preferably, a first lifting module is provided below the first and second translation guide rails. The first lifting module is located on the lower end face of the translation guide rails. A lifting cylinder is fixedly connected to the bottom of the first lifting module. The top end of the piston rod of the lifting cylinder is fixed to the bottom end face of the first lifting module. The cylinder body of the lifting cylinder is fixed on the upper end face of the worktable, corresponding to the center position of the first lifting module. A guide rod is also provided on the worktable. The upper end of the guide rod is slidably connected inside the first lifting module. When the empty pallet is transported to the top of the translation guide rail, the lifting cylinder is activated, the piston rod extends upward, and pushes the first lifting module to drive the translation guide rail to rise vertically along the guide rod to receive the empty pallet.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] This invention achieves continuous transport of empty pallets without requiring them to change their orientation by setting up a first, second, and third guide rail that are distributed at right angles, as well as a liftable first and second translational guide rail connecting the guide rails. Compared to traditional designs that require large-angle turning guide rails, this design avoids the risks of pallet deviation, jamming, and slippage during turning, ensuring transport safety. It also significantly shortens the overall length of the guide rail layout, reducing the space occupied by the equipment in the workshop, making the structure more compact and adaptable to more installation scenarios.

[0019] This invention, by setting up a chain drive structure with the upper end of the chain higher than the upper end of the guide rail groove, ensures that the empty pallet only contacts the chain for transmission. The chains on both sides maintain the same speed and direction under the action of the connecting rod, so that the empty pallet is always conveyed in a straight line at a uniform speed, improving the stability of the transfer. At the same time, it can avoid bottom wear caused by friction between the empty pallet and the surface of the guide rail groove, and reduce the obstruction of the guide rail by impurities, thus extending the service life of the empty pallet and the equipment.

[0020] This invention, through the design of a stacking section, allows for the vertical clearing of newly stacked empty pallets when they are delivered. A moving plate then drives the stacking forks to lift the existing empty pallets, creating vertical space for the new pallet. Once the new pallet is in place, the stacking forks precisely descend to complete the stacking process. The moving plate then moves the stacking forks outwards to disengage, preventing interference between the forks and the existing empty pallets. The entire process requires no manual intervention, enabling continuous vertical stacking of empty pallets, significantly improving vertical stacking efficiency. Simultaneously, it ensures that the stacked empty pallets are neatly arranged vertically, facilitating subsequent unified storage and retrieval. Attached Figure Description

[0021] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This utility model Figure 1 Another perspective 3D illustration;

[0023] Figure 3 This is a three-dimensional schematic diagram of the first chain inside the first guide rail of this utility model;

[0024] Figure 4 This is a three-dimensional schematic diagram of the first translational guide rail of this utility model;

[0025] Figure 5 This utility model Figure 4 Another perspective 3D illustration;

[0026] Figure 6 This is a three-dimensional schematic diagram of the stacking section of this utility model;

[0027] Figure 7 This is a three-dimensional schematic diagram of the empty pallet in place of the stacking section of this utility model;

[0028] Figure 8 This is a three-dimensional schematic diagram of the stacking part and the bidirectional moving structure of this utility model;

[0029] Figure 9 This is a three-dimensional schematic diagram of the bidirectional moving structure of this utility model.

[0030] In the diagram: 1. Workbench; 2. First guide rail; 3. First translation guide rail; 301. First lifting module; 302. Guide rod; 303. Lifting cylinder; 4. Second guide rail; 5. Second translation guide rail; 6. Third guide rail; 7. Stacking bracket; 701. Stacking fork; 702. Moving plate; 703. Second lifting module; 704. Lead screw; 705. Gearbox; 706. Stacking guide rail; 707. Flat plate; 8. Conveying section; 9. Unloading section; 10. Stacking section; 11. First chain; 12. Second chain; 13. Third chain; 14. Fourth chain; 15. Fifth chain; 16. Guide rail motor; 17. Driven sprocket; 18. Connecting rod; 19. Driving sprocket. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Example:

[0033] Please see Figures 1 to 9 This utility model provides a technical solution:

[0034] An empty pallet stacker includes a workbench 1, on which a first guide rail 2, a second guide rail 4, and a third guide rail 6 are arranged sequentially. The guide rails are distributed with right-angle turns to achieve the turning and conveying of empty pallets (e.g., ...). Figure 1 and Figure 2 (As shown).

[0035] Below the unloading section 9 at the end of the first guide rail 2, there is a liftable first translational guide rail 3. The guide rail direction of the first translational guide rail 3 is perpendicular to the first guide rail 2 and faces the second guide rail 4 at its end side. Below the end of the second guide rail 4, there is a corresponding liftable second translational guide rail 5. Its guide rail direction faces the third guide rail 6 at the end side of the second guide rail 4. Through the connection of the two translational guide rails, the empty cargo plate can complete the continuous transfer from the first guide rail 2 to the second guide rail 4 and then to the third guide rail 6 without changing its own orientation during the transportation process.

[0036] In this embodiment, a pallet filled with goods enters the first guide rail from the front conveying section 8 area of ​​the first guide rail 2. Under the synchronous transmission of the first chains 11 on both sides of the first guide rail 2, it is smoothly conveyed to the unloading section 9 at the end of the guide rail. Then, the transmission system of the first guide rail 2 stops, and the pallet stops precisely at the preset position of the unloading section 9. At this time, the automatic unloading device, such as the robotic arm (not shown in the figure), which is preset next to the unloading section 9, starts and automatically grabs and transfers the goods on the pallet according to the set program. After completing all unloading operations, the unloading device resets and stands by. Once the pallet is confirmed to be empty, the first translation guide rail 3 rises until its guide surface is higher than the first guide rail 2. Simultaneously, the second chain 12 inside the first translation guide rail 3 starts, using the friction between the chain and the bottom of the empty pallet to laterally transport the empty pallet from the unloading section 9 of the first guide rail 2 to the second guide rail 4. After the empty pallet enters the second guide rail 4, it is transported to its end position by the drive of the third chain 13 inside the second guide rail 4. Subsequently, the second translation guide rail 5 uses the same lifting and transmission logic as the first translation guide rail 3 to further transfer the empty pallet. The empty pallet is then transferred from the first guide rail 2 to the third guide rail 6, completing the entire transfer process and preparing for subsequent stacking operations. Throughout the transfer, the empty pallet maintains its initial orientation without any angle adjustment, preventing stacking skewing or misalignment due to turning deviations. This ensures the overall neatness and stability of the stack and effectively avoids potential shifts, jams, or even pallet slippage caused by centrifugal force or guide deviations during pallet turning, significantly improving the safety of empty pallet transfer. Simultaneously, the first and second translational guide rails 3 and 5 achieve lateral connection between the rails, eliminating the need for large-angle turning guide rail sections. While meeting the requirements for empty pallet turning and transport, this significantly shortens the overall guide rail layout length, reducing the equipment's footprint on the workbench and in the workshop, resulting in a more compact structure and adaptability to various installation and usage scenarios.

[0037] Each guide rail and translation guide rail adopts a chain drive structure. Guide rail grooves are formed on both sides of the first guide rail 2, and first chains 11 are symmetrically arranged in the grooves. The chains extend along the length of the guide rail, and their two ends respectively mesh with driven sprockets 17 rotatably connected to the groove walls (e.g., Figure 3As shown, the driven sprockets 17 at corresponding positions on both sides are coaxially fixed by connecting rods 18 that penetrate the groove wall laterally; only the middle of the first chain 11 on the right side is provided with a driving sprocket 19, whose axle penetrates the groove wall and is connected to the output shaft of the guide rail motor 16 fixed on the side of the guide rail housing. When the motor starts, it drives the single-sided chain to move through the driving sprocket 19, and then drives the chains on both sides to circulate through the connecting rod 18. Stable conveying is achieved by the friction between the chain and the bottom of the empty cargo plate. The transmission structure of the first translation guide rail 3, the second guide rail 4, the second translation guide rail 5 and the third guide rail 6 is completely the same as that of the first chain 11 in the first guide rail 2. They are respectively equipped with a second chain 12, a third chain 13, a fourth chain 14 and a fifth chain 15. The length of each chain is adapted and adjusted according to the actual size of the guide rail, and all are driven by the driving sprocket 19 set on one side and the corresponding guide rail motor 16 to ensure that the conveying speed of each section is matched.

[0038] Specifically, a bearing is fitted at the end of the shaft connecting the driven sprocket 17 and the inner wall of the guide rail groove. The outer ring of the bearing is interference-fitted with the pre-set mounting hole in the guide rail groove wall, and the inner ring is transition-fitted with the sprocket shaft. This reduces the frictional resistance when the sprocket rotates and ensures the precise positioning of the sprocket axis. Flexible couplings are provided at the connection points between the driven sprockets 17 on both sides and the connecting rod 18. The two ends of the coupling are fixed to the sprocket shaft and the connecting rod 18 respectively by key connections. This can effectively compensate for installation errors and slight coaxiality deviations during transmission, and avoid stress concentration caused by rigid connections. The connection between the shaft of the drive sprocket 19 and the output shaft of the guide rail motor 16 adopts a shrink-fit coupling. The keyless connection between the shaft and the hub is achieved through radial pressure. This ensures reliable transmission of transmission torque and facilitates disassembly and assembly for later maintenance, ensuring long-term stable operation of the chain drive system.

[0039] In this embodiment, when installing the chains in each guide rail and the translation guide rail, the upper end of the chain is 2-3mm higher than the upper end of the guide rail groove. This ensures that when the empty cargo plate is placed on the chain, it only contacts the chain and does not rub against the upper surface of the guide rail groove. This reduces wear on the bottom of the empty cargo plate and avoids obstruction of the empty cargo plate conveying by impurities on the guide rail surface, thus ensuring the smoothness of the conveying process.

[0040] When an empty pallet needs to be transported, the guide rail motor 16 of the corresponding guide rail is started. The output shaft of the motor drives the drive sprocket 19 to rotate synchronously through the coupling. The drive sprocket 19 meshes with the chain, and when it rotates, it drives the chain to circulate along the length of the guide rail groove. At the same time, since the driven sprockets 17 on both sides are coaxially fixed through the connecting rod 18, when the chain on one side moves, it will drive the connecting rod 18 to rotate through the driven sprocket 17, thereby causing the driven sprocket 17 on the other side to rotate synchronously. Finally, the chains on both sides are driven at the same speed and in the same direction. The empty pallet is placed on the chains on both sides. Under the action of static friction between the chain and the bottom of the empty pallet, it moves synchronously with the chain. Since the speed of the chains on both sides is consistent and the transmission is smooth, the empty pallet can always maintain a uniform linear motion state and be transported to the target position.

[0041] In addition, tension sprockets can be added to the guide grooves of each guide rail and translation guide rail according to actual usage requirements and chain length. The setting of tension sprockets is a conventional technical means in the field of chain drive, and its specific structure and installation method have been disclosed by existing related technologies, so there is no need to elaborate here.

[0042] The lifting and lowering of the first translation guide rail 3 and the second translation guide rail 5 are controlled by the first lifting module 301. The first lifting module 301 is symmetrically arranged on the lower end face of each translation guide rail (e.g., Figure 5 As shown), the first lifting module 301 includes a lifting cylinder 303 fixedly connected to the bottom center. The top of the cylinder piston rod is fixedly connected to the center of the lower end face of the first lifting module 301. The lifting cylinder 303 is fixed at the corresponding position on the workbench 1. The workbench 1 is also provided with multiple guide rods 302, the upper ends of which slide into the lifting module. When the empty cargo plate is transported to the top of the translation guide rail, the piston rod of the lifting cylinder 303 extends out, pushing the translation guide rail to rise vertically along the guide rods 302 to receive the cargo. After the transfer is completed, it descends and resets.

[0043] In this embodiment, when the empty pallet is transported to a preset position directly above the translation guide rail via the previous guide rail (the first guide rail 2 corresponds to the first translation guide rail 3, and the second guide rail 4 corresponds to the second translation guide rail 5), the guide rail motor 16 of the previous guide rail will stop running, causing its internal chain to stop transmission, so that the empty pallet is stably stopped above the translation guide rail. Only then will the lifting cylinder 303 below the translation guide rail be activated, and the piston rod will extend upward, pushing the first lifting module 301 to drive the translation guide rail to rise vertically along the guide rod 302 until the guide rail surface of the translation guide rail is slightly higher than the guide rail of the next guide rail. The guide rail motor 16 of the translation guide rail starts, driving the internal chain to circulate and transmit the empty pallet smoothly to the next section of the guide rail by means of the friction between the chain and the bottom of the empty pallet. When the empty pallet is completely separated from the translation guide rail and enters the next section of the guide rail, the guide rail motor 16 of the translation guide rail stops running, the piston rod of the lifting cylinder 303 retracts, and drives the translation guide rail to descend along the guide rod 302 to reset to the initial height, waiting for the next empty pallet transfer instruction. The whole process is controlled by PLC linkage to avoid the empty pallet from shifting or the conveying from jamming due to disordered action sequence.

[0044] It should be noted that the entire equipment's motion linkage control is achieved through a PLC (Programmable Logic Controller) (a manual control button is also provided to prevent manual intervention in case of system errors). The start-stop time and running time of each guide rail motor 16 and lifting cylinder 303 are logically controlled according to the preset program. This not only avoids disordered action sequence, but also allows for flexible adjustment of conveying speed and lifting height according to actual conveying needs, adapting to the transfer scenarios of empty pallets of different sizes.

[0045] The guide rail motor 16 is preferably a three-phase asynchronous geared motor (such as the YS7134 geared motor). This model of motor has the characteristics of stable rated speed (usually 1400r / min, and the output speed after reduction can be adapted to the chain drive requirements) and large output torque. It can effectively drive the chain to move the empty cargo plate smoothly, and has an overload protection function to avoid motor damage caused by the empty cargo plate jamming. The chain and sprocket are preferably made of 45 steel. The chain is heat treated and surface blackened for rust prevention to improve wear resistance and corrosion resistance. The sprocket teeth are made of high frequency quenching process, and the hardness can reach HRC50-55, which extends the service life of the teeth and ensures the structural stability under long-term high frequency transmission. At the same time, 45 steel material has moderate cost and mature processing technology, which facilitates later maintenance and replacement.

[0046] The lifting cylinder 303 is preferably a standard SC series cylinder (such as a cylinder with model number SC80×100-S), which is sufficient to support the total weight of the first translation guide rail, the second translation guide rail, and the empty cargo plate.

[0047] The stacking section 10 is located at the end of the third guide rail 6. The stacking section 10 has a bidirectional moving structure, including a "U"-shaped stacking support 7 (e.g., Figure 8 As shown, the guide rail bracket is fixed to the ground below the third guide rail 6 by bolts. The stacking bracket 7 has its opening facing upwards, and a gearbox 705 is installed at the center of the upper bottom surface. The input end of the front is connected to a reduction motor, and the output ends on both sides are connected to lead screws 704. The two sides of the lead screw 704 are rotatably connected to the bottom of the stacking bracket 7 through bearings and bushings, respectively. The two ends of the lead screw 704 are machined with symmetrical threads with opposite directions of rotation. The bottom of the bracket is also provided with two parallel stacking guide rails 706, located on both sides of the lead screw 704. The bottom of the two side moving plates 702 are slidably engaged with the stacking guide rails 706 and threadedly connected to the lead screw 704. When the reduction motor drives the lead screw 704 to rotate through the gearbox 705, the two side moving plates 702 move synchronously in opposite directions along the guide rails at the same speed. A second lifting module 703 is installed inside each moving plate 702, and its output end is horizontally connected to a row of parallel and equidistant stacking forks 701. The stacking forks 701 extend towards the third guide rail 6.

[0048] It should be noted that the second lifting module 703 mainly consists of an electric linear module. Its core function is to drive a row of stacking forks 701 to move precisely up and down vertically by driving the linear motion of the output end, thereby completing the lifting and lowering of empty pallets. As a conventional lifting drive component in this field, the electric linear module mainly consists of a ball screw 704, a guide rail slider, a servo motor, and a housing. The servo motor is connected to the ball screw 704 via a coupling. When the motor starts, it drives the ball screw 704 to rotate, which in turn drives the slider threadedly connected to the screw 704 to move linearly along the guide rail, ultimately realizing the lifting action of the stacking forks 701. The specific installation method conforms to industry-standard assembly specifications and will not be elaborated further here.

[0049] In this embodiment, when the empty pallet has not been transported from the third guide rail 6 to the stacking section 10, the reduction motor starts and drives the lead screw 704 to rotate through the gearbox 705. With the help of the opposite thread transmission at both ends of the lead screw 704, the moving plates 702 on both sides move synchronously towards the center along the stacking guide rail 706 until the stacking forks 701 on both sides are precisely inserted into the bottom gap of the empty pallet that has been stacked at the end of the third guide rail 6 (initially, the first empty pallet transported to the stacking section 10 can be picked up first). Then the second lifting module 703 starts, and its internal servo motor drives the ball screw 704 to rotate, which drives the slider and the stacking fork 701 to move vertically upward, raising the picked-up empty pallet to a preset height to avoid interference with the subsequently transported empty pallets. After that, the second lifting module 703 stops operating, and the stacking section 10 enters the waiting state.

[0050] When the third guide rail 6 delivers the next empty pallet to the corresponding position in the stacking section 10 (i.e., directly below the already lifted empty pallet), the guide rail motor 16 of the third guide rail 6 stops running, and the empty pallet remains stably in the designated position. At this time, the second lifting module 703 starts again, driving the stacking fork 701 and the already lifted empty pallet to descend vertically until the already lifted empty pallet is placed stably on top of the newly delivered empty pallet. After stacking is completed, the reduction motor rotates in the opposite direction, driving the lead screw 704 to drive the two side moving plates 702 to move outward synchronously along the stacking guide rail 706, so that the stacking fork 701 disengages from the gap at the bottom of the empty pallet. Finally, the second lifting module 703 drives the stacking fork 701 to descend and reset, waiting for the next empty pallet to be delivered to the stacking section 10. The above actions are repeated to realize the layer-by-layer stacking and recycling of empty pallets. The stacked empty pallets are neatly arranged for easy subsequent unified retrieval.

[0051] It should be noted that a vertically set flat plate 707 is fixedly connected to the upper surface of each of the two movable plates 702 (e.g., Figure 7As shown, the inner end face of the flat plate 707 remains flat and smooth. When the number of empty pallets stacked gradually increases, the moving plate 702 driven by the geared motor moves towards the center to pick up the empty pallets. The flat plates 707 on both sides will move towards the edge of the empty pallet simultaneously until they are in contact with the two side edges of the empty pallet. Through the limiting function of the flat plate 707, the lateral position of the empty pallet can be calibrated to ensure that the edges of each layer of empty pallets are aligned, making the overall stack more regular. It can also provide lateral support for the empty pallet during the lifting and lowering process driven by the second lifting module 703, effectively counteracting the shaking that may occur during the lifting and lowering process, avoiding the risk of the empty pallet tilting, misaligning, or even slipping off the stacking fork 701 due to shaking, and further ensuring the stability and safety of the empty pallet stacking.

[0052] All other parts of this utility model not described herein are the same as existing technologies, or are known technologies or can be implemented using existing technologies, and will not be described in detail here.

[0053] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An empty pallet stacker, characterized in that, Comprising: a worktable (1), wherein a first guide rail is arranged on the worktable (1), a liftable first translation guide rail (3) is arranged below an unloading part (9) at an end of the first guide rail (2), a guide rail of the first translation guide rail (3) faces a second guide rail (4) on a side face of the end of the first guide rail (2); after an empty pallet is conveyed to the unloading part (9) at the end through the first guide rail (2), the first translation guide rail (3) can be lifted upward to be flush with the first guide rail (2) to receive the empty pallet, and then the empty pallet is transversely conveyed to the second guide rail (4) through transmission of the guide rail of the first translation guide rail (3); a liftable second translation guide rail (5) is arranged below an end of the second guide rail (4), a guide rail of the second translation guide rail (5) faces a third guide rail (6) on a side face of the end of the second guide rail (4) to transversely transfer the empty pallet to the third guide rail (6), and the empty pallet does not need to change its orientation during the transfer process, so that continuous transfer from the first guide rail (2) to the second guide rail (4) and then to the third guide rail (6) can be completed; a stacking part (10), wherein the stacking part (10) is arranged at an end of the third guide rail (6), a bidirectional moving structure is arranged on the stacking part (10), and the empty pallet is lifted to a certain height through a vertical lifting action, so that a newly conveyed empty pallet can be stably placed below stacked empty pallets.

2. The empty plate stacker according to claim 1, characterized in that: the bidirectional moving structure comprises a stacking bracket (7), the stacking bracket (7) is of a C-shaped structure with an upward opening, the bottom of the stacking bracket (7) is fixedly arranged in a region below the third guide rail (6), a stacking guide rail (706) is arranged on the upper end face of the bottom of the stacking bracket (7), bottoms of two side moving plates (702) are respectively assembled on the stacking guide rail (706) in a sliding manner, and can move horizontally along the stacking guide rail (706).

3. The empty plate stacker according to claim 2, characterized in that: a second lifting module (703) is installed on the inner side of the moving plate (702), an output end of the second lifting module (703) is horizontally connected with a row of stacking forks (701), an extending direction of the stacking forks (701) faces the third guide rail (6), a plurality of stacking forks (701) are distributed in parallel at equal intervals, and the row of stacking forks (701) can be controlled to synchronously lift in the vertical direction by the second lifting module (703), so as to lift the empty pallet.

4. The empty plate stacker according to claim 3, characterized in that: a gear box (705) is fixedly connected to a center of the upper end face of the bottom of the stacking bracket (7), a front input end of the gear box (705) is connected with a gear motor, two side output ends of the gear box (705) are rotatably connected with screw rods (704), the screw rods (704) on two sides are provided with symmetrically distributed threads with opposite rotation directions, thread sections at two ends of the screw rods (704) respectively penetrate through and are in threaded connection with bottoms of the moving plates (702) on two sides, and the stacking guide rails (706) are respectively located on two sides of the screw rods (704).

5. The empty plate stacker according to claim 1, characterized in that: The first guide rail (2) has guide rail grooves on both sides, and a first chain (11) is provided in each guide rail groove. The first chain (11) extends along the length direction of the first guide rail (2), and the two ends of the first chain (11) are respectively connected to the driven sprocket (17). The driven sprocket (17) is rotatably connected to the inner wall of the guide rail groove on both sides.

6. The empty plate stacker according to claim 5, characterized in that: A drive sprocket (19) is provided at the middle position of the first chain (11). The axle of the drive sprocket (19) passes laterally through the two side walls of the guide rail groove, and the drive sprocket (19) meshes with the first chain (11) for transmission. The drive sprocket (19) is rotatably connected to the output shaft of the guide rail motor (16). The guide rail motor (16) is fixedly connected to the side of the first guide rail (2) housing through a motor bracket. The first chains (11) are symmetrically arranged in the guide rail grooves on both sides of the first guide rail (2), and the first chains (11) on both sides are rotatably connected to the output shaft of the guide rail motor (16). The driven sprockets (17) at both ends of the chain (11) are coaxially connected by a connecting rod (18). The connecting rod (18) passes through the guide rail groove wall on both sides of the first guide rail (2) laterally, and the connecting rod (18) is fixedly connected to the driven sprocket (17). When one driven sprocket (17) rotates, the corresponding driven sprocket (17) on the other side can be rotated synchronously through the connecting rod (18). Only the middle part of the first chain (11) on the right side is provided with a drive sprocket (19) and a guide rail motor (16).

7. The empty plate stacker according to claim 6, characterized in that: The first translational guide rail (3) has a second chain (12) in its guide rail groove, the second guide rail (4) has a third chain (13) in its guide rail groove, the second translational guide rail (5) has a fourth chain (14) in its guide rail groove, and the third guide rail (6) has a fifth chain (15) in its guide rail groove. The second, third, fourth, and fifth chains have the same structure as the first chain (11) and are paired with a driven sprocket (17), a connecting rod (18), and a single-sided driving sprocket (19) and a guide rail motor (16). The length of the chain matches the length of the guide rail groove of the corresponding guide rail or translational guide rail.

8. The empty plate stacker according to claim 1, characterized in that: A first lifting module (301) is provided below the first translation guide rail (3) and the second translation guide rail (5). The first lifting module (301) is located on the lower end face of the translation guide rail. A lifting cylinder (303) is fixedly connected to the bottom of the first lifting module (301). The top end of the piston rod of the lifting cylinder (303) is fixed to the bottom end face of the first lifting module (301). The cylinder body of the lifting cylinder (303) is fixed on the upper end face of the workbench (1) corresponding to the center position of the first lifting module (301). A guide rod (302) is also provided on the workbench (1). The upper end of the guide rod (302) is slidably connected inside the first lifting module (301).

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