Automatic stacking device for photo frame back plate finished products

Abstract

The utility model discloses an automatic stacking device for photo frame back plate finished products, which comprises a working table, a material delivering mechanism and a stacking mechanism are arranged on the working table, an open type stacking frame is formed by four limiting rods and four limiting blocks in the stacking mechanism, a linkage mechanism is designed by a lifting plate and the limiting blocks, and the lifting plate and the limiting blocks are connected with the working table. In other words, after the lifting plate jacks the photo frame back plate from bottom to top, when the lifting plate is about to make contact with the limiting block, the limiting block retracts to give way, and when the lifting plate jacks the photo frame back plate, crosses the horizontal plane of the limiting block and resets downwards, the limiting block resets preferentially, so that the outgoing path of the photo frame back plate is blocked, and the photo frame back plate is intercepted. The photo frame back plate stacking device pushes photo frame back plates upwards from the bottom, automatically stacks the photo frame back plates step by step, ensures that the photo frame back plates are stacked neatly and stably, and improves product quality. And moreover, manual stacking operation is replaced, the labor intensity of workers is reduced, the production efficiency is remarkably improved, the large-batch production requirement is met, and the economic benefit is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of picture frame processing equipment, and more specifically to an automatic stacking device for finished picture frame back panels. Background Technology

[0002] As an important component of the picture frame, the back panel of the picture frame needs to be stacked during the production process to facilitate storage, transportation and subsequent processing.

[0003] As a component of a picture frame, the back panel needs to be supplied in an orderly manner to subsequent processes in the picture frame manufacturing line. However, there is currently no mature finished picture frame back panel stacking equipment on the market, and it mainly relies on manual operation, which has the following problems:

[0004] (1) Manual stacking is slow and cannot meet the needs of mass production, becoming a bottleneck that restricts production efficiency.

[0005] (2) As labor costs rise, the economic benefits of manual stacking gradually decrease, and repetitive stacking operations can easily lead to worker fatigue and pose safety hazards.

[0006] (3) The stacking quality is unstable. Since the back panel of the picture frame is not a regular shape, its back has support feet that protrude from the plane. Manual stacking is prone to problems such as misalignment and tilting, which affects subsequent processing and product quality. Utility Model Content

[0007] The purpose of this utility model is to overcome the above-mentioned defects in the prior art and provide an automatic stacking device for finished picture frame back panels that reduces labor costs, reduces labor intensity, improves stacking quality, and improves production efficiency.

[0008] To achieve the above objectives, this utility model is implemented through the following technical solution: an automatic stacking device for finished picture frame back panels, comprising a workbench, on which a feeding mechanism and a stacking mechanism are arranged, characterized in that the feeding mechanism includes a pair of parallel and spaced first and second feeding guide rails, a first circulating chain belt is arranged beside the first feeding guide rail, and a second circulating chain belt is arranged beside the second feeding guide rail; a first extending guide rail is formed horizontally forward at the end of the first feeding guide rail, and a second extending guide rail is formed horizontally forward at the end of the second feeding guide rail; the stacking mechanism includes four... The limiting mechanisms are arranged in a matrix to enclose and form an open stacking rack. Two of the limiting mechanisms are mounted on the first extension guide rail, and the other two are mounted on the second extension guide rail. Each limiting mechanism includes a vertically arranged limiting rod, and each limiting rod is mounted on the first or second extension guide rail via a limiting seat. Each limiting seat has a horizontally arranged sliding shaft, and each sliding shaft has a sliding sleeve fitted on its free end. Each sliding sleeve has a limiting block on its free end. Each sliding shaft has a limiting block between its corresponding sliding sleeve and the limiting seat. A return spring is clamped in place. Each sliding sleeve has a rack arranged along its length on its surface. Each rack meshes with a gear. Each gear is mounted on its corresponding limiting seat. An eccentrically arranged shaft is arranged on the side of each gear. A top block is arranged beside each limiting seat. A vertically arranged second slide rail is arranged on each top block. A second slider is arranged on each second slide rail. Each second slider is mounted on its corresponding limiting seat. A shaft is axially connected to the side of the second slide rail on each top block. Each freely rotating lever is connected to a torsion spring between itself and its corresponding top block. The lower end of each top block extends to the bottom of its corresponding first or second extension guide rail and is connected to a support. The four supports are all mounted on a horizontally arranged lifting plate. A lifting cylinder is located below the center of the lifting plate and is mounted on the worktable. The four corners of the lifting plate are slidably mounted on the worktable via a sliding column. Two supports located below the first or second extension guide rail jointly support a vertically upward-arranged lifting plate, which is arranged opposite to each other.

[0009] The major innovative feature of this utility model is its reverse-thinking approach: pushing the photo frame back panel from the bottom up to gradually complete the stacking. This is a unique stacking method that offers unique advantages in the stacking of finished photo frame back panels, and is particularly suitable for automated production lines or scenarios requiring high-precision stacking. It has the following advantages:

[0010] (1) The material is stacked and fed from the bottom. The material is pushed from the bottom through the lifting plate, lifting cylinder and lifting plate. Since the material is pushed from the bottom to the top, the position of each layer can be precisely controlled to ensure that the stacking is neat and the alignment is high, avoiding the possible offset or misalignment problems when the manual or robotic arm places it from top to bottom.

[0011] (2) The material is stacked from the bottom, and the bottom material is always in a stable support state. The center of gravity is always kept at a low position, which further enhances the stability of the stack.

[0012] (3) Stacking and feeding from the bottom is a smooth pushing method that reduces friction and collision between materials and lowers the damage rate. When stacking from top to bottom, materials may be subject to collision or wear due to falling or improper placement.

[0013] (4) The material is stacked and fed from the bottom. The top is open, which can be easily and seamlessly connected with the subsequent processes of the production line, reducing downtime and improving overall production efficiency.

[0014] This utility model uses four limiting rods and four limiting blocks to form an open stacking rack. The limiting rods are L-shaped profiles, corresponding to and protecting one corner of the picture frame back panel. The limiting blocks have a flat upper surface that fits into the picture frame back panel, and a guide slope on the lower surface. This guide slope design perfectly complements the most important design innovation of this utility model, which is the reverse thinking of stacking from the bottom up. The lifting plate and the limiting blocks are designed with a linkage mechanism. After the lifting plate lifts the picture frame back panel from the bottom up, when it is about to contact the limiting block, the limiting block is retracted by components such as the top block, the push block, the torsion spring, the gear, the rack, the sliding sleeve, and the sliding rod, thus giving the picture frame back panel a chance to enter the stacking rack. When the upper edge of the lifting plate pushes the picture frame back panel past the horizontal plane of the limiting block, it begins to return to its original position. At this time, the limiting block returns to its original position first, thus blocking the path of the picture frame back panel and intercepting it, thereby achieving the purpose of stacking from the bottom.

[0015] Preferably, each of the first and second extension guides is provided with a locking groove extending along its respective length. Each locking groove is provided with a pair of locking rods that can adjust their relative positions. The two limiting seats of the first extension guide are fixed by a pair of locking rods, and the two limiting seats on the second extension guide are also fixed by a pair of locking rods. The lower end of each top block extends to the bottom of its corresponding first or second extension guide and is provided with a third slider. The two third sliders located below the first or second extension guide are jointly provided on a third slide rail. Each third slide rail is provided with a pair of support seats on its lower side.

[0016] This invention takes into account the different sizes of back panels. The original design of this invention is to meet the stacking work of back panels of any size. Therefore, in order to match the different sizes of back panels, the distance between the two limiting rods (including the two limiting blocks) on the first extension guide rail needs to be adjustable. The distance between the two limiting rods (including the two limiting blocks) on the second extension guide rail also needs to be adjusted synchronously. The locking groove can solve this problem well. Then, the locking rod is used to lock it. This not only realizes the adjustment and matching of different sizes of back panels, but also the adjustment of the starting position.

[0017] Preferably, the first material guide rail is provided with a first limiting step, and the second material guide rail is provided with a second limiting step, the first limiting step and the second limiting step being arranged symmetrically about a center; the first extension guide rail is provided with a first extension step, and the second extension guide rail is provided with a second extension step, the first extension step and the second extension step being arranged symmetrically about a center; the first limiting step, the second limiting step, the first extension step and the second extension step are located on the same horizontal plane; the first circulating chain is provided with a first pusher block, and the second circulating chain is provided with a second pusher block, the first pusher block and the second pusher block being arranged symmetrically about a center; the upper edge of the first pusher block is higher than the step surface of the first limiting step and the first extension step, and the upper edge of the second pusher block is higher than the step surface of the second limiting step and the second extension step.

[0018] This invention features a limiting step on the material guide rail, which effectively confines the back panel of the photo frame within it. As the back panel of the photo frame is pushed forward by the pusher block, it will not deviate from its straight forward trajectory.

[0019] Preferably, the lower part of the limiting rod on the side of the first extended guide rail away from the first material support guide rail is in contact with the step surface of the first extended step, while the lower part of the other limiting rod near the first material support guide rail is separated from the step surface of the first extended step by a first material passage gap; the lower part of the limiting rod on the second extended guide rail away from the first material support guide rail is in contact with the step surface of the second extended step, while the lower part of the other limiting rod near the second material support guide rail is separated from the step surface of the second extended step by a second material passage gap.

[0020] The process from the first material guide rail to the first extension rail and from the second material guide rail to the second extension rail is a material delivery process, which means that the materials are fed in one by one in a regular manner and then stacked one by one. The four limiting rods are the core of the stacking rack, so the back panel of the picture frame needs to be sent into them. In this way, the two limiting rods on the outside can act as stop positions, so that their lower edges rest against the step surface of the first or second extension step. When the back panel of the picture frame is sent to this position, it is stopped in place. At this time, the rear edge of the back panel of the picture frame just enters the first and second material passing gaps. When designing, it is also necessary to pay attention to the dimensions. When the first and second pusher blocks reach the end of their respective first and second circulating chain belts, they enter the next cycle. There is a time interval between reaching the next starting point and the feeding process, which allows the equipment to stack.

[0021] Preferably, the first circulating chain belt has a first drive sprocket and a first driven sprocket at its two ends, and the second circulating chain belt has a second drive sprocket and a second driven sprocket at its two ends, respectively. A drive shaft runs through the first drive sprocket and the second drive sprocket, connecting them in series for synchronous driving. The drive shaft is connected to a drive mechanism that drives the first drive sprocket. The drive mechanism includes a first motor, and a drive pulley is mounted on the motor shaft of the first motor. The drive pulley is connected to a driven pulley via a transmission belt, and the driven pulley is located at one end of the drive shaft.

[0022] The photo frame back panel is supported between the first and second material support rails. The first motor starts and transmits power to the drive shaft through the driven pulley, transmission belt and drive pulley. Then, the first drive sprocket, second drive sprocket, first driven sprocket and second driven sprocket drive the first and second circulating chain belts to rotate synchronously in the same direction. Finally, the first pusher block and the second pusher block push the photo frame back panel forward to the stacking rack composed of four limit rods, completing the work of delivering the photo frame back panel to the stacking rack.

[0023] Preferably, the first material support guide rail, the first circulating chain belt, the first drive sprocket, and the first driven sprocket are all mounted on a fixed bracket, which is mounted on a worktable; the second material support guide rail, the second circulating chain belt, the second drive sprocket, and the second driven sprocket are all mounted on a movable bracket, with a pair of first sliders installed below each of the two ends of the movable bracket along its length, and each pair of first sliders is mounted on a first slide rail, which is mounted on the worktable; the drive shaft is suspended on the worktable by a pair of support plates, which exist independently of the movable bracket and the fixed bracket; the outer surface of the drive shaft is provided with several strips of equal arc length and spaced apart, all extending along its axial direction, and the inner walls of the first and second drive sprockets are each provided with several grooves that are the same number as the strips on the drive shaft and match one-to-one.

[0024] This utility model takes into account the different sizes of the back panels. The original design of this utility model is to meet the feeding work of back panels of any size. Therefore, in order to match the different sizes of the back panels, the second material support rail and the second circulating chain are designed on the movable bracket, so that the distance between them and the first material release rail and the first circulating chain can be adjusted, thereby meeting the delivery of photo frame back panels of different sizes.

[0025] To facilitate the above design, in order for the second circulating chain to move, the second drive sprocket driving its rotation should also be able to slide. The second drive sprocket needs to be able to slide axially on the drive shaft while also achieving radial transmission. Therefore, the second drive sprocket and drive shaft must be locked radially to prevent transmission slippage. Thus, inserts and grooves are preferably designed to satisfy both actions. The purpose of designing the first drive sprocket in this way is twofold: firstly, to reduce the number of parts of different specifications, thus lowering the installation difficulty; and secondly, to lay the groundwork for future implementation of sliding functionality for the first drive sprocket.

[0026] Preferably, each of the supports is provided with a fourth slider below it, and the lifting plate is provided with a pair of horizontally arranged fourth slide rails. The two fourth slide rails are arranged perpendicularly to the first extension guide rail and the second extension guide rail, and the four fourth sliders are paired and slidably installed on the two fourth slide rails.

[0027] This invention takes into account the different sizes of back plates, and its design aims to accommodate stacking of back plates of any size. Therefore, to match different back plate sizes, the distance between a pair of limiting rods and a pair of limiting blocks on the first extended guide rail and another pair of limiting rods and another pair of limiting blocks on the second extended guide rail is adjustable. However, it is not only necessary to ensure that at least one of the first and second extended guide rails can move, but also that at least one of the two supports can move in tandem. The second extended guide rail can move together with the second material support guide rail on the movable bracket. Therefore, it is only necessary to restrict the support of the second extended guide rail to also move. Thus, this invention adds a fourth slider and a fourth slide rail between the support and the lifting plate.

[0028] Beneficial effects: (1) This utility model realizes the automated stacking of finished photo frame back panels, ensuring neat and stable stacking and improving product quality. Moreover, it replaces manual stacking operations, reduces the labor intensity of workers, significantly improves production efficiency, meets the needs of mass production, and improves economic benefits.

[0029] (2) This utility model stacks materials from the bottom up, which has significant advantages in the stacking of finished picture frame back panels. These advantages include high precision, strong stability, suitability for automation, reduced material damage, strong adaptability, space saving, improved efficiency, high safety, and ease of subsequent processing. Moreover, this stacking method is particularly suitable for modern production lines, which can significantly improve production efficiency and product quality while reducing costs and risks. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of this utility model;

[0031] Figure 2 This is a schematic diagram of the material delivery mechanism of this utility model;

[0032] Figure 3 This is a schematic diagram of the stacking mechanism of this utility model;

[0033] Figure 4 for Figure 3 Side view;

[0034] Figure 5 This is a schematic diagram of the limiting mechanism of this utility model;

[0035] Figure 6 This is a partial structural schematic diagram of the limiting mechanism of this utility model.

[0036] In the diagram: 1-Workbench, 2-First material support guide rail, 3-Second material support guide rail, 4-First circulating chain belt, 5-Second circulating chain belt, 6-First pusher block, 7-Second pusher block, 8-First limiting step, 9-Second limiting step, 10-First drive sprocket, 11-First driven sprocket, 12-Second drive sprocket, 13-Second driven sprocket, 14-Drive shaft, 15-First motor, 16-Drive pulley, 17-Transmission belt, 18-Driven pulley, 19-Fixed bracket, 20-Modible bracket, 21-First slider, 22-First slide rail, 23-Support plate, 24-First... 1-Extension guide rail, 25-Second extension guide rail, 26-First extension step, 27-Second extension step, 28-Limiting rod, 29-Limiting seat, 30-Locking groove, 31-Locking rod, 32-Sliding shaft, 33-Sliding sleeve, 34-Limiting block, 35-Reset spring, 36-Gear, 37-Eccentric shaft, 38-Top block, 39-Second slide rail, 40-Second slider, 41-Pulling block, 42-Torsion spring, 43-Third slider, 44-Third slide rail, 45-Support, 46-Lifting plate, 47-Lifting plate, 48-Lifting cylinder, 49-Sliding column, 50-Fourth slider, 51-Fourth slide rail. Detailed Implementation

[0037] To make the technical means, creative features and objectives of this utility model easier to understand, the following describes this utility model in conjunction with specific embodiments.

[0038] Example: Figure 1 As shown, an automatic stacking device for finished picture frame back panels includes a workbench 1, on which a material delivery mechanism and a stacking mechanism are provided.

[0039] like Figure 2 As shown, the feeding mechanism includes a pair of parallel, spaced-apart first material-supporting guide rails 2 and second material-supporting guide rails 3. A first circulating chain belt 4 is arranged beside the first material-supporting guide rail 2, and a second circulating chain belt 5 is arranged beside the second material-supporting guide rail 3. A first pusher block 6 is arranged on the first circulating chain belt 4, and a second pusher block 7 is arranged on the second circulating chain belt 5. The first pusher block 6 and the second pusher block 7 are arranged symmetrically around the center.

[0040] The first circulating chain belt 4 has a first drive sprocket 10 and a first driven sprocket 11 at its two ends, and the second circulating chain belt 5 has a second drive sprocket 12 and a second driven sprocket 13 at its two ends, respectively. A drive shaft 14, which connects the first drive sprocket 10 and the second drive sprocket 12 in series for synchronous driving, passes through them. The drive shaft 14 is connected to a drive mechanism that drives its operation.

[0041] The drive mechanism includes a first motor 15, a drive pulley 16 is provided on the motor shaft of the first motor 15, and a driven pulley 18 is connected to the drive pulley 16 through a transmission belt 17. The driven pulley 18 is provided on one end of the drive shaft 14.

[0042] The first material guide rail 2, the first circulating chain belt 4, the first drive sprocket 10 and the first driven sprocket 11 are all mounted on a fixed bracket 19, which is mounted on the worktable 1.

[0043] The second material guide rail 3, the second circulating chain belt 5, the second drive sprocket 12, and the second driven sprocket 13 are all mounted on a movable bracket 20. A pair of first sliders 21 are installed below each of the first and last ends of the movable bracket 20 along its length. Each pair of first sliders 21 is mounted on a first slide rail 22. The two first slide rails 22 are mounted on the worktable 1.

[0044] The drive shaft 14 is suspended on the worktable 1 by a pair of support plates 23, which exist independently of the movable bracket 19 and the fixed bracket 20. The outer surface of the drive shaft 13 is provided with six strips of equal arc length and spaced apart, all extending along its axial direction. The inner walls of the first drive sprocket 10 and the second drive sprocket 12 are each provided with six grooves that are the same number as the strips on the drive shaft 14 and match each other.

[0045] A first extension guide rail 24 extends horizontally forward from the end of the first material-supporting guide rail 2, and a second extension guide rail 25 extends horizontally forward from the end of the second material-supporting guide rail 3. A first limiting step 8 is provided on the first material-supporting guide rail 2, and a second limiting step 9 is provided on the second material-supporting guide rail 3. The first limiting step 8 and the second limiting step 9 are arranged symmetrically around the center. A first extension step 26 is provided on the first extension guide rail 24, and a second extension step 27 is provided on the second extension guide rail 25. The first extension step 26 and the second extension step 27 are arranged symmetrically around the center. The first limiting step 8, the second limiting step 9, the first extension step 26, and the second extension step 27 are located on the same horizontal plane. The upper edge of the first pusher block 6 is higher than the step surfaces of the first limiting step 8 and the first extension step 26, and the upper edge of the second pusher block 7 is higher than the step surfaces of the second limiting step 9 and the second extension step 27.

[0046] like Figure 3 As shown, the stacking mechanism includes four limiting mechanisms arranged in a matrix to enclose and form an open stacking rack. Two of the limiting mechanisms are set on the first extension guide rail 24, and the other two limiting mechanisms are set on the second extension guide rail 25.

[0047] like Figure 4 , Figure 5 and Figure 6As shown, each limiting mechanism includes a vertically arranged limiting rod 28, which is an L-shaped profile. Each limiting rod 28 is mounted on the first extension guide rail 24 or the second extension guide rail 25 via a limiting seat 29. The first extension guide rail 24 and the second extension guide rail 25 are each provided with a locking groove 30 extending along their respective length direction. Each locking groove 30 is provided with a pair of locking rods 31 that can adjust their relative positions. The two limiting seats 29 of the first extension guide rail 24 are fixed by a pair of locking rods 31, and the two limiting seats 29 on the second extension guide rail 25 are also fixed by a pair of locking rods 31.

[0048] The lower part of the limiting rod 28 on the first extended guide rail 24, which is away from the first material support guide rail 2, is in contact with the step surface of the first extended step 26, while the lower part of the other limiting rod 28, which is near the first material support guide rail 2, is separated from the step surface of the first extended step 26 by a first material passage gap; the lower part of the limiting rod 28 on the second extended guide rail 25, which is away from the first material support guide rail 3, is in contact with the step surface of the second extended step 27, while the lower part of the other limiting rod, which is near the second material support guide rail 3, is separated from the step surface of the second extended step 27 by a second material passage gap.

[0049] Each limiting seat 29 is provided with a horizontally arranged sliding shaft 32. A sliding sleeve 33 is fitted onto the free end of each sliding shaft 32. A limiting block 34 is provided on the free end of each sliding sleeve 33. The upper end surface of the limiting block 34 is flat, and the lower end surface is sloped. A return spring 35 is clamped between the corresponding sliding sleeve 33 and the limiting seat 29 on each sliding shaft 32. A rack is provided along the length of each sliding sleeve 33, and each rack meshes with a gear 36. Each gear 36 is respectively provided on its corresponding limiting seat 29. Each wheel 36 has an eccentrically arranged eccentric shaft 37 on its side. Each limit seat 29 has a top block 38 on its side. Each top block 38 has a vertically arranged second slide rail 39. Each second slide rail 39 has a second slider 40. Each second slider 40 is set on its corresponding limit seat 29. Each top block 38 has a freely rotatable lever 41 connected to the side of its second slide rail 39. The root of the lever 41 is a shaft. Each lever 41 and its corresponding top block 38 are provided with a torsion spring 42.

[0050] Each top block 38 extends to the bottom of its corresponding first extension rail 24 or second extension rail 25 and is provided with a third slider 43. The two third sliders 43 below the first extension rail 24 or second extension rail 25 are together set on a third slide rail 44. Each third slide rail 44 is provided with a pair of supports 45 on its lower side.

[0051] Below the four supports 25, there is a horizontally arranged lifting plate 47. The lifting plate 47 is equipped with a pair of horizontally arranged fourth slide rails 51. The two fourth slide rails 51 are arranged perpendicularly to the first extension guide rail 24 and the second extension guide rail 25. Below each support 45, there is a fourth slider 50. The four fourth sliders 50 are paired and slidably installed on the two fourth slide rails 51. That is to say, the two fourth sliders 50 are on one fourth slide rail 51, and the two fourth sliders 50 belong to different supports 45.

[0052] A lifting cylinder 28 is provided below the center of the lifting plate 47. The lifting cylinder 48 is installed on the workbench 1. The four corners of the lifting plate 47 are slidably mounted on the workbench 1 via a sliding column 49. Two supports 45 below the first extension guide rail 24 or the second extension guide rail 25 jointly support a vertically upward-arranged lifting plate 46. The two lifting plates 46 are arranged opposite each other.

[0053] Usage: During material feeding, adjust the distance between the first and second material support rails according to the specific dimensions of the back panel. Unlock the movable support to allow it to move, allowing the second extension rail to move along with it. This adjusts the distance between the limit rods on both sides. After adjustment, lock the movable support to prevent further movement. Additionally, the locking rod shifts within the locking groove, adjusting the distance between the limit rods on the same side, thus ensuring the stacking rack matches the back panel dimensions, enabling stacking operations.

[0054] The process of feeding materials from the first material guide rail to the first extension rail and from the second material guide rail to the second extension rail is a delivery process, which involves feeding materials in systematically one by one and then stacking them up. The back plate is mounted between the first and second material guide rails. The first motor drives the drive shaft to rotate through the transmission mechanism. The drive shaft then drives the first and second circulating chain belts to rotate synchronously, thereby causing the first and second pusher blocks to push the back plate.

[0055] The four limiting rods are the core of the stacking rack, so the back panel of the picture frame needs to be sent into them. The two limiting rods on the outside can then serve as stop positions, with their lower edges resting on the surface of the first or second extended step. When the back panel of the picture frame is sent to this position, it is stopped in place. At this time, the rear edge of the back panel of the picture frame just enters the first and second material passing gaps. When designing, it is also necessary to calculate the dimensions carefully. When the above-mentioned position is reached, the first and second pusher blocks reach the ends of their respective first and second circulating chains and then enter the next cycle. There is a time interval between reaching the next starting point and the feeding process, which allows for the equipment to stack.

[0056] Once the photo frame back panel is in place, the material is fed and stacked from bottom to top. The top block and lifting plate are mounted on the support and are raised and lowered synchronously by the lifting cylinder and lifting plate. After the lifting plate lifts the photo frame back panel from bottom to top, the top block also moves upwards simultaneously, causing the pusher block to move upwards. When the pusher block contacts the eccentric shaft, the lifting plate, pushing against the photo frame back panel, reaches the lowest point of the limit block's ramp surface. Then, the eccentric shaft is pushed, driving the gear to rotate. Next, the rack, carrying the sliding sleeve, slowly retracts against the pressure of the return spring, thus slowly retracting the limit block. The lifting plate then pushes against... The back panel of the picture frame moves uphill relative to the inclined surface of the limiting block (actually, the vertical line remains stationary while the water surface line moves upward). When the limiting block is fully retracted and leaves its position, the lifting plate pushes the back panel of the picture frame past the limiting block to reach above its upper plane. During this process, the eccentric shaft moves further and further away from the lever until the contact area between the two becomes smaller and smaller. The lever then moves diagonally above the eccentric shaft. After the eccentric shaft is unrestrained, the return spring is also unrestrained, thus pushing out the limiting block to the bottom of the lifted back panel of the picture frame, thereby blocking the path of the back panel of the picture frame and intercepting it. Then the gear and eccentric shaft reset, and the lifting cylinder moves in the opposite direction. The lifting plate will lose contact with the back panel of the picture frame, which will be replaced by the limiting block. The synchronous top block also moves downward, and the lever moves downward. When it encounters the obstruction of the eccentric shaft, the torsion spring deforms, and the lever resets to the bottom of the eccentric shaft. After the lifting plate has reset, the next back panel of the picture frame is delivered and the material is stacked from bottom to top.

Claims

1. An automatic stacking device for finished photo frame backboards, comprising a worktable, a feeding mechanism and a stacking mechanism arranged on the worktable, characterized in that, The feeding mechanism comprises a pair of first and second spaced parallel supporting rails, a first circulating chain belt is arranged beside the first supporting rail, and a second circulating chain belt is arranged beside the second supporting rail; The terminal end of the first supporting rail horizontally extends forward to form a first extension rail, and the terminal end of the second supporting rail horizontally extends forward to form a second extension rail; The stacking mechanism comprises four limiting mechanisms arranged in a matrix mode to form an open stacking frame, two of the limiting mechanisms are arranged on the first extension rail, and the other two limiting mechanisms are arranged on the second extension rail; Each limiting mechanism comprises a vertically arranged limiting rod, each limiting rod is installed on the first extension rail or the second extension rail through a limiting seat, a horizontally arranged sliding shaft is arranged on each limiting seat, a sliding sleeve is sleeved on the free end of each sliding shaft, a limiting block is arranged on the free end of each sliding sleeve, a return spring is clamped on each sliding shaft between the corresponding sliding sleeve and the limiting seat, a rack is arranged on the surface of each sliding sleeve along the length direction, each rack is engaged with a gear, each gear is arranged on the corresponding limiting seat, an eccentric shaft is arranged on the side surface of each gear, a top block is arranged beside each limiting seat, a vertically arranged second sliding rail is arranged on each top block, a second sliding block is arranged on each second sliding rail, each second sliding block is arranged on the corresponding limiting seat, a freely rotatable knob is shaft-connected to each top block beside the second sliding rail, and a torsion spring is arranged between each knob and the corresponding top block; The lower end of each top block extends below the corresponding first extension rail or second extension rail and is connected with a supporting base, the four supporting bases are arranged below a horizontally arranged lifting plate, a lifting cylinder is arranged below the center of the lifting plate, the lifting plate is slidably arranged on the workbench through a sliding column at the four corners of the lifting plate, and two lifting plates are vertically upward arranged and held by the two supporting bases below the first extension rail or the second extension rail.

2. The automatic photo frame backer finished product stacking device according to claim 1, characterized in that, A locking groove is arranged on each of the first extension rail and the second extension rail along the length direction, a pair of locking rods capable of adjusting the relative position are arranged in each locking groove, the two limiting seats of the first extension rail are fixed by pairing a locking rod, and the two limiting seats of the second extension rail are also fixed by pairing a locking rod. The lower end of each of the top blocks extends to below the corresponding first or second extension rail and is provided with a third sliding block. Two third sliding blocks below the first or second extension rail are jointly arranged on a third sliding rail. The lower side of each third sliding rail is provided with a pair of holders.

3. The automatic photo frame backer finished product stacking device according to claim 1, characterized in that, The first material supporting rail is provided with a first limiting step, and the second material supporting rail is provided with a second limiting step. The first limiting step and the second limiting step are arranged in central symmetry. The first extension rail is provided with a first extension step, and the second extension rail is provided with a second extension step. The first extension step and the second extension step are arranged in central symmetry. The first limiting step, the second limiting step, the first extension step and the second extension step are located on the same horizontal plane. The first circulating chain is provided with a first material pushing block, and the second circulating chain is provided with a second material pushing block. The first material pushing block and the second material pushing block are arranged in central symmetry. The upper edge of the first material pushing block is higher than the step surface of the first limiting step and the first extension step, and the upper edge of the second material pushing block is higher than the step surface of the second limiting step and the second extension step.

4. The photo frame backing panel finished product automatic stacking device according to claim 3, characterized in that, The lower part of the limiting rod on the side of the first extension rail away from the first material supporting rail is adjacent to the step surface of the first extension step, and the lower part of the limiting rod on the side adjacent to the first material supporting rail is spaced from the step surface of the first extension step by a first material passing gap. The lower part of the limiting rod on the side of the second extension rail away from the first material supporting rail is adjacent to the step surface of the second extension step, and the lower part of the limiting rod on the side adjacent to the second material supporting rail is spaced from the step surface of the second extension step by a second material passing gap.

5. The automatic photo frame backer finished product stacking device according to claim 1, characterized in that, The first circulating chain is provided with a first driving sprocket and a first driven sprocket at the two ends, and the second circulating chain is provided with a second driving sprocket and a second driven sprocket at the two ends. A driving shaft is arranged through the first driving sprocket and the second driving sprocket to synchronously drive them in series. The driving shaft is connected to a driving mechanism for driving the operation. The driving mechanism comprises a first motor. A driving pulley is arranged on the motor shaft of the first motor. The driving pulley is connected to a driven pulley through a transmission belt. The driven pulley is arranged on one end of the driving shaft.

6. The automatic photo frame backer board finished product stacking device according to claim 5, characterized in that, The first material supporting rail, the first circulating chain, the first driving sprocket and the first driven sprocket are jointly installed on a fixed support. The fixed support is installed on a workbench. The second material supporting rail, the second circulating chain, the second driving sprocket and the second driven sprocket are jointly installed on a movable support. A pair of first sliding blocks is installed below the two ends of the movable support in the length direction. Each pair of first sliding blocks is installed on a first sliding rail. The two first sliding rails are installed on the workbench. The driving shaft is suspended on the workbench through a pair of support plates. The two support plates are independent of the movable support and the fixed support. The outer surface of the driving shaft is provided with a plurality of inlays with equal arc length and arranged along the axial direction of the driving shaft, and the inner wall of each of the first driving sprocket and the second driving sprocket is provided with a plurality of inlay grooves with the same number as the inlays on the driving shaft and matched one by one.

7. The automatic photo frame backer finished product stacking device according to claim 1, characterized in that, A fourth sliding block is arranged below each of the holders, and a pair of horizontally arranged fourth sliding rails is arranged on the lifting plate, wherein the two fourth sliding rails are arranged perpendicularly to the first extension guide rail and the second extension guide rail, and the four fourth sliding blocks are slidably installed on the two fourth sliding rails in pairs.

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