Wood pallet stacking device with guide alignment function

Abstract

The utility model discloses a wood pallet stacking device with guiding alignment function belongs to the logistics equipment technical field. Including tray conveying belt, square frame, jacking mechanism, alignment mechanism, lifting mechanism, stacking mechanism, guiding mechanism and control system. Guiding mechanism is equipped with three groups of adjustable vertical guide plate spacing, jacking mechanism is through the thin type air cylinder jacking wood pallet, alignment mechanism adopts cam push structure to realize horizontal alignment, lifting mechanism is by double -acting cylinder drive L shaped support lifting, stacking mechanism is through servo motor drive L shaped support board stacking, and control system contains the coordinated action of PLC and sensor. The device solves the problem of low alignment precision and poor adaptability of traditional stacking, and is suitable for efficient automatic stacking of wood pallet.

Description

Technical Field

[0001] This utility model relates to the field of logistics equipment technology, and in particular to a wooden pallet stacking device with a guiding and alignment function. Background Technology

[0002] Wooden pallets, as the core carrier for logistics transportation and warehousing stacking, directly impact operational efficiency and space utilization in the logistics process through standardized production and efficient palletizing. In the finished product warehouses or logistics transfer centers of wooden pallet manufacturers, large quantities of finished wooden pallets need to be neatly stacked according to specified layers and orientations for easy storage and transportation. Traditional palletizing operations mainly rely on manual operation or simple mechanized equipment. However, with the expansion of wooden pallet production scale and the increasing standardization requirements, the limitations of traditional methods are becoming increasingly apparent: manual palletizing is inefficient and inconsistent: manual palletizing requires multiple people to work together, and only 1-2 pallets can be handled at a time. Furthermore, due to the operator's experience, parameters such as pallet stacking alignment and interlayer gaps are difficult to standardize, easily leading to wasted storage space or collapse during transportation due to skewed stacking, posing significant safety hazards. Existing automated equipment lacks sufficient alignment accuracy: although some companies use automated palletizing equipment, the guiding alignment structure is generally simple (such as fixed limit plates). Due to potential dimensional deviations (e.g., length and width errors ±2-5mm) or uneven surfaces during the production of wooden pallets, fixed guide plates struggle to adapt to the alignment requirements of different pallets. This often results in pallets jamming against the guide plates or misalignment even after alignment, leading to stacking misalignment and affecting overall stability. Equipment adaptability and flexibility are also low: traditional palletizing equipment typically has fixed guide spacing. Switching between pallet sizes (e.g., 1200mm and 1100mm lengths) requires manual disassembly and reinstallation of the guide plates, which is time-consuming and labor-intensive (usually requiring over 30 minutes of downtime for adjustment), failing to meet the needs of small-batch, multi-specification production. Furthermore, there is a lack of real-time monitoring and protection mechanisms: during lifting and jacking processes, if abnormal lifting force occurs due to pallet deformation or excessive stacking height (e.g., exceeding the cylinder's rated load), the lack of effective pressure feedback and shutdown protection can easily damage the equipment (e.g., bent cylinder piston rods) or cause pallet breakage, increasing maintenance costs and material losses.

[0003] In summary, there is an urgent need for an automated palletizing device designed specifically for the characteristics of wooden pallets, featuring high-precision alignment, strong adaptability, and intelligent control, to solve the problems of low efficiency, poor consistency, and insufficient flexibility in traditional palletizing operations. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a wooden pallet stacking device with guiding and alignment function.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: This utility model discloses a wooden pallet stacking device with guiding and alignment functions, comprising: a pallet conveyor belt for horizontally conveying wooden pallets to be stacked; a square frame fixedly installed at the conveying end of the pallet conveyor belt and perpendicular to the conveying surface of the pallet conveyor belt; a stacking cavity formed vertically through the square frame; a lifting mechanism located at the bottom of the stacking cavity for lifting the wooden pallets at the end of the pallet conveyor belt away from the conveying surface; an alignment mechanism located above the lifting mechanism for horizontally aligning the lifted wooden pallets; a lifting mechanism located directly above the alignment mechanism for lifting the aligned wooden pallets to the stacking height; a stacking mechanism located directly above the lifting mechanism for stacking and fixing the lifted wooden pallets in layers; and a guiding mechanism located opposite the alignment mechanism, comprising three sets of vertically parallel guide plates fixed to the inner sidewall of the square frame; the three sets of guide plates are arranged at intervals along the conveying direction of the wooden pallets, and the spacing between adjacent sets of guide plates is adjustable, for defining the alignment reference plane of the wooden pallets.

[0006] As a preferred embodiment of this utility model, the lifting mechanism includes: a lifting bracket, which is rigidly fixed to the bottom of the conveyor end of the pallet conveyor belt by bolts and connected to the frame of the pallet conveyor belt; a lifting cylinder, which is a thin cylinder, the cylinder body of which is hinged to the side of the lifting bracket through a fisheye joint, and the piston rod extends vertically upward; and a lifting plate, which is a horizontal rectangular metal plate, the bottom surface of which is connected to the top of the piston rod of the lifting cylinder through a ball joint, and the top surface of which is in contact with the bottom surface of the wooden pallet; the size of the lifting plate is smaller than the bottom surface size of the wooden pallet to avoid interference with the guide plates on both sides during lifting.

[0007] As a preferred embodiment of this utility model, the alignment mechanism includes: an alignment support frame, fixedly installed on the outer wall of the square frame and communicating with the stacking cavity; an alignment mounting plate, horizontally disposed on the top of the alignment support frame and fixedly connected to the alignment support frame by countersunk bolts; two sets of guide bearing seats, symmetrically disposed on the sides of the alignment mounting plate and spaced apart along the width direction of the wooden pallet; two alignment guide shafts, respectively passing through the two sets of guide bearing seats and perpendicular to the alignment mounting plate, with the two ends of the alignment guide shafts limited by shaft shoulders; and a rotary motor, fixedly installed on the alignment support frame. At the bottom of the support frame, its output shaft passes vertically upward through the alignment mounting plate; a disc-shaped cam is fixedly mounted on the top of the output shaft of the rotary motor, and its outer circumferential surface contacts the bottom surface of the push plate; the push plate is a horizontal rectangular plate structure, with its bottom two ends slidably connected to two alignment guide shafts respectively, one side being tangent to the outer circumferential surface of the cam through a connecting block, and the other end face contacting the side of the wooden pallet; wherein, when the rotary motor drives the cam to rotate, the contour of the cam pushes the push plate to reciprocate linearly along the alignment guide shaft, pushing the wooden pallet towards the guide plate to achieve horizontal alignment.

[0008] As a preferred embodiment of this utility model, the lifting mechanism includes two sets of symmetrically arranged lifting units, spaced apart on both sides of the inner wall of the stacking cavity along the conveying direction of the pallet conveyor belt; each lifting unit includes: a lifting support base, fixedly installed on the inner wall of the square frame; two lifting guide shafts, vertically parallel to each other, passing through the lifting support base, with their bottom ends fixedly connected to the bottom surface of the lifting support base; a lifting slider, a rectangular block, sleeved on the two lifting guide shafts, which can slide vertically along the lifting guide shafts; a vertical fixing plate, vertically fixed to the side of the lifting slider, with its outer end face parallel to the inner wall of the square frame; and two lifting bearing seats, for... The components are arranged at intervals along the horizontal direction on the outer end face of the vertical fixing plate; a lifting rotating shaft is horizontally inserted into two lifting bearing seats, with its two ends limited by shaft shoulders; an L-shaped lifting bracket is a bent angle iron, the horizontal section of which is fixedly connected to the lifting rotating shaft, and the vertical section is used to lift the wooden pallet; a lifting cylinder is a double-acting cylinder, the cylinder body of which is hinged to the outer end face of the vertical fixing plate through a fisheye joint, and the top of the piston rod is connected to the end of the L-shaped lifting bracket through a ball joint; wherein, the lifting cylinder drives the L-shaped lifting bracket to rotate around the lifting rotating shaft, and in conjunction with the sliding of the lifting slider along the lifting guide shaft, the wooden pallet is lifted from the alignment position to the stacking height.

[0009] As a preferred embodiment of this utility model, the palletizing mechanism includes four holding units, symmetrically distributed in a rectangle along the four corners of the square frame; each holding unit includes: a palletizing fixing seat, fixedly installed at the top four corners of the square frame by expansion bolts; a palletizing motor, which is a servo motor, fixedly installed on the top surface of the palletizing fixing seat, with its output shaft vertically downward passing through the palletizing fixing seat; and an L-shaped palletizing support plate, which is a bent angle iron, with one end fixedly connected to the bottom end of the output shaft of the palletizing motor by a coupling, and the other end used to support the pallet layer after palletizing; wherein, the upper surfaces of the vertical sections of the four L-shaped palletizing support plates are coplanar, forming a palletizing support surface, and the height of the palletizing support surface matches the lifting height of the lifting mechanism; the palletizing motor can drive the L-shaped palletizing support plate to rotate horizontally.

[0010] As a preferred technical solution of this utility model, it also includes a control system, which includes: a PLC controller for coordinating the timing of the actions of each mechanism; a proximity sensor disposed at the end of the pallet conveyor belt for detecting whether the wooden pallet has reached the lifting position and transmitting the signal to the PLC controller; and a pressure sensor disposed on the top surface of the lifting plate for detecting whether the lifting force exceeds a threshold and transmitting the signal to the PLC controller; wherein, the PLC controller controls the actions of the lifting mechanism, the alignment mechanism, the lifting mechanism, and the palletizing mechanism based on the signals from the proximity sensor and the pressure sensor.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. By setting up an adjustable guiding mechanism (three sets of vertical guide plates with adjustable spacing) and a pushing alignment mechanism (cam-driven pushing plate), precise horizontal alignment of wooden pallets is achieved. The spacing between the guide plates can be adjusted in real time according to the actual size of the wooden pallet (e.g., by adjusting with bolts or handwheels), adapting to pallets of different lengths and widths; the pushing mechanism uses a rotary motor to drive a disc-shaped cam, pushing the pushing plate to move linearly along the alignment guide axis, reliably pushing the wooden pallet against the guide plate, with an alignment error ≤1mm, significantly reducing the risk of misalignment between stacked layers, and improving storage safety and space utilization; 2. The lifting mechanism adopts a lifting plate structure with a thin cylinder and ball joint connection. The lifting plate is smaller than the bottom of the wooden pallet to avoid interference with the guide plate. The lifting mechanism drives the L-shaped lifting bracket to rotate through a double-acting cylinder. With the sliding of the lifting slider along the guide shaft, the wooden pallet can be smoothly transitioned from the alignment position to the stacking height. The lifting process is impact-free and jam-free, effectively reducing the risk of pallet edge wear or cracking. 3. The three sets of guide plates of the guiding mechanism are arranged at intervals along the conveying direction, and the adjacent spacing is adjustable, which can quickly adapt to the pallet stacking requirements of different specifications of wooden pallets. The switching time is only 5-10 minutes, which greatly improves the adaptability of the equipment to small-batch multi-variety production. 4. The integrated control system, consisting of a PLC controller, proximity sensor, and pressure sensor, can monitor the position of the wooden pallet (proximity sensor triggers lifting action) and lifting force (pressure sensor provides load feedback) in real time. When the lifting force exceeds the threshold (e.g., abnormal resistance caused by pallet deformation), the PLC immediately controls the lifting cylinder to stop and triggers an alarm to prevent equipment overload damage. At the same time, the rotation angle of the palletizing motor is precisely controlled by the PLC to ensure accurate matching between the L-shaped palletizing support plate and the lifting height, improving the reliability of the palletizing action. 5. All functional mechanisms adopt a modular structure. For example, the lifting cylinder is bolted to the frame via a lifting bracket; the push plate and guide bearing seat of the alignment mechanism can be quickly disassembled and assembled; and the L-shaped lifting bracket and rotating shaft of the lifting unit are designed separately. When a component fails, it can be disassembled and repaired or replaced individually without shutting down the entire machine, significantly reducing maintenance time and costs. Attached Figure Description

[0012] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is the front view of this utility model; Figure 3 This is a side view of the present invention; Figure 4 This is a top view of the present invention; In the diagram: 1. Pallet conveyor belt; 2. Lifting mechanism; 3. Alignment mechanism; 4. Lifting mechanism; 5. Stacking mechanism; 6. Guiding mechanism; 7. Control system; 11. Square frame; 12. Stacking cavity; 21. Lifting bracket; 22. Lifting cylinder; 23. Lifting plate; 31. Alignment support frame; 32. Alignment mounting plate; 33. Guide bearing seat; 34. Alignment guide shaft; 35. Rotary motor; 36. Cam; 37. Push plate; 41. Lifting unit 51. Holding unit; 61. Guide plate; 71. PLC controller; 72. Proximity sensor; 73. Pressure sensor; 411. Lifting support base; 412. Lifting guide shaft; 413. Lifting slider; 414. Vertical fixing plate; 415. Lifting bearing seat; 416. Lifting rotating shaft; 417. L-shaped lifting bracket; 418. Lifting cylinder; 511. Palletizing fixing base; 512. Palletizing motor; 513. L-shaped palletizing support plate. Detailed Implementation

[0013] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0014] In the attached diagram, all identical reference numerals refer to the same components.

[0015] Example 1: Automated palletizing process for standard-sized wooden pallets like Figure 1-4 As shown, this embodiment takes the stacking operation of a standard 1200mm×1100mm wooden pallet as an example to illustrate the working process of the device and the collaborative relationship between the various mechanisms.

[0016] In the initial state, the pallet conveyor belt 1 horizontally transports the wooden pallets to be stacked to its end. The square frame 11 is fixedly installed at the end of the conveyor and perpendicular to the conveyor surface, forming a stacking cavity 12 that runs vertically through the interior. When the wooden pallet reaches the end of the conveyor, the proximity sensor 72 located at the end of the conveyor belt detects that the pallet has arrived and transmits the signal to the PLC controller 71.

[0017] The PLC controller 71 triggers the lifting mechanism 2 to operate: the lifting bracket 21 is rigidly connected to the conveyor belt frame by bolts, and the cylinder body of the thin lifting cylinder 22 inside is hinged to the side of the lifting bracket 21 through a fisheye joint. The piston rod pushes the lifting plate 23 vertically upward. The bottom surface of the lifting plate 23 is connected to the top of the piston rod through a ball joint, and the top surface contacts the bottom surface of the wooden pallet, which smoothly lifts the wooden pallet away from the conveyor surface, completing the lifting action.

[0018] Please see Figure 2 After the lifting is completed, the alignment mechanism 3 is activated: the alignment support frame 31 is fixed to the outer wall of the square frame 11 and communicates with the stacking cavity 12. The horizontally set alignment mounting plate 32 on its top is fixed by countersunk bolts; two alignment guide shafts 34 pass through the guide bearing seats 33 on the side of the alignment mounting plate 32, and the two ends of the guide shafts 34 are limited by the shaft shoulders; the rotary motor 35 is fixed to the bottom of the alignment support frame 31, and its output shaft passes vertically upward through the alignment mounting plate 32 and is connected to the disc cam 36; the push plate 37 is a horizontal rectangular plate, and its bottom end is sleeved on the alignment guide shafts 34 and can slide. One side is tangent to the outer circumference of the cam 36 through the connecting block, and the other end face contacts the side of the wooden pallet. When the rotary motor 35 drives the cam 36 to rotate, the cam profile pushes the push plate 37 to move linearly along the alignment guide shaft 34 towards the guide mechanism 6, pushing the wooden pallet against the three sets of vertically parallel guide plates 61 (the guide plates 61 are fixed to the inner wall of the square frame 11, and the adjacent spacing matches the standard pallet width), to achieve horizontal alignment.

[0019] Please see Figure 3-4After alignment, the lifting mechanism 4 operates: two sets of symmetrically arranged lifting units 41 are spaced apart on both sides of the inner wall of the stacking cavity 12 along the conveying direction. The lifting support seat 411 of each lifting unit 41 is fixed to the inner wall of the square frame 11. Two lifting guide shafts 412 are vertically inserted through the lifting support seat 411 and fixed at the bottom. The lifting slider 413 is sleeved on the guide shaft 412 and can slide vertically. The side of the slider is vertically fixed to the vertical fixing plate 414. The outer end face of the vertical fixing plate 414 is horizontally inserted through two lifting bearing seats 415. The rotating shaft 416 is fixedly connected to the horizontal section of the L-shaped lifting bracket 417. The vertical section of the L-shaped bracket 417 is used to lift the wooden pallet. The cylinder body of the double-acting lifting cylinder 418 is hinged to the outer end face of the vertical fixing plate 414 through a fisheye joint. The top of the piston rod is connected to the end of the L-shaped bracket 417 through a ball joint. The PLC controller 71 controls the extension and retraction of the lifting cylinder 418, drives the L-shaped bracket 417 to rotate around the lifting rotation axis 416, and at the same time the lifting slider 413 slides along the guide axis 412 to smoothly lift the wooden pallet from the alignment station to the stacking height (coplanar with the support surface of the stacking mechanism 5).

[0020] The palletizing mechanism 5 operates synchronously: four holding units 51 are symmetrically distributed along the four corners of the square frame 11. Each unit's palletizing mounting base 511 is fixed to the four corners of the top of the frame with expansion bolts. A servo palletizing motor 512 is fixed to the top surface of the palletizing mounting base 511, and its output shaft passes vertically downward through the mounting base and connects to one end of the L-shaped palletizing support plate 513. The other end of the L-shaped support plate 513 extends horizontally to form a support surface. The PLC controller 71 controls the palletizing motor 512 to drive the L-shaped support plate 513 to rotate to a horizontal position, so that the support surface matches the lifting height. The lifting mechanism 4 descends and places the wooden pallet on the support plate, completing one layer of palletizing. Subsequently, the palletizing motor 512 reverses and drives the L-shaped support plate 513 to rotate away, and the lifting mechanism 4 repeats the action to lift the next layer of wooden pallet until the set number of layers is reached.

[0021] Example 2: Rapid adaptation and palletizing of wooden pallets of different specifications This embodiment takes the stacking operation of a narrow-sized wooden pallet of 1100mm×1000mm as an example to focus on verifying the adaptability of the device's guiding mechanism.

[0022] The guide plate 61 of the guide mechanism 6 is fixed to the inner wall of the square frame 11 by bolts and is equipped with a handwheel adjustment mechanism to facilitate quick adjustment of the spacing by the operator. When it is necessary to switch the pallet specifications, the operator can quickly adjust the guide reference plane by adjusting the installation position of the guide plate 61 in the guide mechanism 6 on the inner wall of the square frame 11 (such as sliding the guide plate 61 horizontally along the side wall of the frame after loosening the fixing bolts, and adjusting the spacing between two adjacent sets of guide plates 61 to match the width of the narrow pallet).

[0023] The subsequent lifting, alignment, support, and palletizing processes are consistent with those in Example 1: Lifting mechanism 2 lifts the wooden pallet off the conveying surface; the alignment mechanism 3's pusher plate 37, driven by rotary motor 35, pushes the pallet against the adjusted guide plate 61, achieving horizontal alignment of the narrow pallet; the support mechanism 4's L-shaped support bracket 417 lifts the pallet to the palletizing height; and the palletizing mechanism 5's L-shaped palletizing support plate 513 supports the pallet layer, completing the automated palletizing of narrow-specification pallets. The switching process only requires adjusting the position of the guide plate 61, without disassembling other components, and the switching time is ≤10 minutes, significantly improving the equipment's adaptability to multi-specification production.

[0024] Example 3: Safety Protection Verification under Abnormal Operating Conditions This embodiment verifies the device's protective function in case of abnormal lifting force. When the lifting resistance increases due to deformation or excessive stacking height of the wooden pallet, the pressure sensor 73 on the top surface of the lifting plate 23 detects the lifting force in real time and transmits the signal to the PLC controller 71. If the lifting force exceeds a preset threshold, such as 120% of the cylinder's rated load, the PLC controller 71 immediately outputs a control signal, closes the air inlet valve of the lifting cylinder 22, and triggers an alarm device to prevent the cylinder piston rod from bending due to overload or the pallet from falling. At the same time, the double-acting lifting cylinder 418 of the lifting mechanism 4 maintains its current position to prevent the pallet from falling accidentally, ensuring the safety of the equipment and materials. After the abnormality is resolved (such as manually cleaning deformed pallets or adjusting the stacking height), the operator resets the signal of the pressure sensor 73, and the device resumes palletizing operations. This function effectively reduces equipment maintenance costs and material losses, and improves production safety.

[0025] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A wooden pallet stacking device with guiding and alignment function, characterized in that, include: A pallet conveyor belt (1) horizontally transports wooden pallets to be stacked; a square frame (11) is fixedly installed at the end of the pallet conveyor belt (1) and is perpendicular to the conveying surface of the pallet conveyor belt (1); a stacking cavity (12) is formed inside the square frame (11); a lifting mechanism (2) is located at the bottom of the stacking cavity (12) to lift the wooden pallets at the end of the pallet conveyor belt (1) away from the conveying surface; an alignment mechanism (3) is located on one side above the lifting mechanism (2) to align the lifted wooden pallets horizontally; a lifting mechanism ( 4), located directly above the alignment mechanism (3), is used to lift the aligned wooden pallets to the stacking height; stacking mechanism (5), located directly above the lifting mechanism (4), is used to stack and fix the lifted wooden pallets in layers; guide mechanism (6), located opposite the alignment mechanism (3), includes three sets of guide plates (61) vertically and parallelly fixed to the inner side wall of the square frame (11); the three sets of guide plates (61) are arranged at intervals along the conveying direction of the wooden pallets, and the spacing between adjacent sets of guide plates (61) is adjustable, which is used to define the alignment reference surface of the wooden pallets.

2. A wooden pallet stacking device with guiding and alignment function according to claim 1, characterized in that, The lifting mechanism (2) includes: a lifting bracket (21), which is rigidly fixed to the bottom of the conveying end of the pallet conveyor belt (1) by bolts and connected to the frame of the pallet conveyor belt (1); a lifting cylinder (22), which is a thin cylinder, whose cylinder body is hinged to the side of the lifting bracket (21) through a fisheye joint, and whose piston rod extends vertically upward; a lifting plate (23), which is a horizontal rectangular metal plate, whose bottom surface is connected to the top of the piston rod of the lifting cylinder (22) through a ball joint, and whose top surface is in contact with the bottom surface of the wooden pallet; the size of the lifting plate (23) is smaller than the bottom surface size of the wooden pallet to avoid interference with the guide plates (61) on both sides during lifting.

3. A wooden pallet stacking device with guiding and alignment function according to claim 1, characterized in that, The alignment mechanism (3) includes: an alignment support frame (31), fixedly installed on the outer wall of the square frame (11) and connected to the stacking cavity (12); an alignment mounting plate (32), horizontally set on the top of the alignment support frame (31) and fixedly connected to the alignment support frame (31) by countersunk bolts; two sets of guide bearing seats (33), symmetrically arranged on the side of the alignment mounting plate (32) and spaced apart along the width direction of the wooden pallet; two alignment guide shafts (34), respectively passing through the two sets of guide bearing seats (33) and perpendicular to the alignment mounting plate (32), with the two ends of the alignment guide shafts (34) limited by shaft shoulders; and a rotary motor (35), fixedly installed on the bottom of the alignment support frame (31). The output shaft passes vertically upward through the alignment mounting plate (32); the disc cam (36) is fixedly mounted on the top of the output shaft of the rotary motor (35); the push plate (37) is a horizontal rectangular plate structure, with its bottom surface slidably connected to two alignment guide shafts (34) at both ends, one side being tangent to the outer circumferential surface of the cam (36) through a connecting block, and the other end face contacting the side of the wooden pallet, and the outer circumferential surface of the cam (36) contacting the bottom surface of the push plate (37); wherein, when the rotary motor (35) drives the cam (36) to rotate, the contour of the cam (36) pushes the push plate (37) to reciprocate linearly along the alignment guide shaft (34), pushing the wooden pallet toward the guide plate (61) to achieve horizontal alignment.

4. A wooden pallet stacking device with guiding and alignment function according to claim 1, characterized in that, The lifting mechanism (4) includes two sets of symmetrically arranged lifting units (41), which are spaced apart on both sides of the inner wall of the stacking cavity (12) along the conveying direction of the pallet conveyor belt (1); each lifting unit (41) includes: a lifting support seat (411), which is fixedly installed on the inner wall of the square frame (11); two lifting guide shafts (412), which are vertically parallel to each other and pass through the lifting support seat (411), with their bottom ends fixedly connected to the bottom surface of the lifting support seat (411); a lifting slider (413), which is a rectangular block, is sleeved on the two lifting guide shafts (412), and can slide vertically along the lifting guide shafts (412); and a vertical fixing plate (414), which is vertically fixed to the lifting slider (413). 3) The side of the square frame (11) is parallel to the inner wall of the square frame (11); two lifting bearing seats (415) are symmetrically arranged on the outer end face of the vertical fixing plate (414) and spaced apart in the horizontal direction; the lifting rotating shaft (416) is horizontally inserted into the two lifting bearing seats (415) and its two ends are limited by the shaft shoulder; the L-shaped lifting bracket (417) is a bent angle iron, its horizontal section is fixedly connected to the lifting rotating shaft (416) and its vertical section is used to lift the wooden pallet; the lifting cylinder (418) is a double-acting cylinder, its cylinder body is hinged to the outer end face of the vertical fixing plate (414) through the fish eye joint, and the top of the piston rod is connected to the end of the L-shaped lifting bracket (417) through the ball joint.

5. A wooden pallet stacking device with guiding and alignment function according to claim 1, characterized in that, The palletizing mechanism (5) includes four holding units (51), which are symmetrically distributed in a rectangle along the four corners of the square frame (11). Each holding unit (51) includes: a palletizing fixing seat (511), which is fixedly installed at the top four corners of the square frame (11) by expansion bolts; a palletizing motor (512), which is a servo motor, fixedly installed on the top surface of the palletizing fixing seat (511), and its output shaft passes vertically downward through the palletizing fixing seat (511); an L-shaped palletizing support plate (513), which is a bent angle iron, one end of which is fixedly connected to the bottom end of the output shaft of the palletizing motor (512) by a coupling, and the other end is used to support the pallet layer after palletizing; wherein, the upper surface of the vertical section of the four L-shaped palletizing support plates (513) is coplanar, forming a palletizing support surface, and the height of the palletizing support surface matches the lifting height of the lifting mechanism (4); the palletizing motor (512) can drive the L-shaped palletizing support plate (513) to rotate horizontally.

6. A wooden pallet stacking device with guiding alignment function according to claim 2, characterized in that, It also includes a control system (7), which includes: a PLC controller (71) for coordinating the timing of the actions of each mechanism; a proximity sensor (72) located at the end of the pallet conveyor belt (1) for detecting whether the wooden pallet has reached the lifting position and transmitting the signal to the PLC controller (71); and a pressure sensor (73) located on the top surface of the lifting plate (23) for detecting whether the lifting force exceeds the threshold and transmitting the signal to the PLC controller (71); wherein, the PLC controller (71) controls the actions of the lifting mechanism (2), the alignment mechanism (3), the lifting mechanism (4), and the palletizing mechanism (5) according to the signals of the proximity sensor (72) and the pressure sensor (73).

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