Pre-stacking device and assembly equipment

Abstract

The utility model provides a pre-stacking device and assembly equipment, comprising: a conveying mechanism for receiving and conveying products to be stacked conveyed by a production line body, and the position of the conveying mechanism in butt joint with a stacking robot comprises at least one limiting pre-storage position and a movable pre-storage position side by side with the limiting pre-storage position; the positioning mechanism group is arranged on the conveying path of the conveying mechanism and is used for adjusting the conveying position of the to-be-stacked product; and the limiting mechanism is used for limiting the to-be-stacked products located at the limiting pre-storage position, so that the to-be-stacked products stay at the limiting pre-storage position. Through the synergistic effect of the conveying mechanism, the positioning mechanism set and the limiting mechanism, conveying, storage and taking of the products to be stacked can be effectively managed, and the products can be placed side by side. The positions of products conveyed in a single row can be adjusted in the conveying process, so that a plurality of products are arranged side by side after being conveyed in place; and the stacking robot can take and stack at least two products at the same time, and the stacking efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning manufacturing technology, specifically to a pre-stacking device and assembly equipment. Background Technology

[0002] After the indoor units of an air conditioner split unit are assembled on the production line, they are typically transported to the palletizing station in a single-row arrangement via a conveyor system. Because the indoor units are arranged in a straight line on the production line, the palletizing robot, limited by its working mode and the single-grip capability of its robotic arm, can only grab the indoor units one by one and place them on the pallet. This single-machine, single-grab operation significantly limits palletizing efficiency, especially when facing high-volume demands. For example, when the single-shift output of indoor units reaches 5000 units / day (calculated at 10.25 hours), the palletizing robot needs to maintain a cycle time of less than 7.38 seconds, which the traditional one-by-one grabbing mode cannot meet, resulting in low production efficiency.

[0003] The root cause of the inefficiency lies in the mismatch between the production line layout and the working method of the palletizing robot. The single-row arrangement of the internal units on the conveyor line limits the robot's ability to handle multiple units simultaneously; this serial operation mode not only prolongs the palletizing cycle but also increases the complexity of the robot's movement path, further reducing overall efficiency. In actual production, to address this bottleneck, some companies have had to introduce manual palletizing assistance, but this undoubtedly increases labor costs and weakens the advantages of automation. Utility Model Content

[0004] In order to solve the technical problem of low stacking efficiency of split internal units on the conveyor line in the prior art, this utility model proposes a pre-stacking device and assembly equipment.

[0005] The technical solution adopted in this utility model is:

[0006] This utility model proposes a pre-stacking device, comprising:

[0007] A conveying mechanism is used to receive and convey products to be stacked on the production line, and the position of the conveying mechanism to dock with the palletizing robot includes at least one restricted pre-storage position and an active pre-storage position adjacent to the restricted pre-storage position.

[0008] A positioning mechanism group is disposed on the transmission path of the conveying mechanism, and is used to adjust the position of the product to be stacked, so that the product to be stacked after passing through the positioning mechanism group can be conveyed to the active pre-storage position, and can move the product to be stacked in the active pre-storage position to the restricted pre-storage position.

[0009] The limiting mechanism is used to limit the products to be stacked in the limiting pre-storage position, so that the products to be stacked remain in the limiting pre-storage position.

[0010] The pre-stacking device also includes a suction cup clamp, which is positioned above the location where the conveying mechanism docks with the palletizing robot, and is used to simultaneously transport products to be stacked from the restricted pre-storage position and the active pre-storage position to the palletizing robot.

[0011] Furthermore, the suction cup clamp includes: a first suction cup and a second suction cup arranged side by side for adsorbing two products to be stacked, and a connecting post connecting the first suction cup and the second suction cup.

[0012] The positioning mechanism group includes:

[0013] The first positioning mechanism can push the product to be stacked along the conveying direction perpendicular to the conveying mechanism, so that the product to be stacked is conveyed to the side close to the conveying mechanism.

[0014] The second positioning mechanism can push the product to be stacked, which is located in the active pre-storage position, to the restricted pre-storage position.

[0015] Furthermore, both the first positioning mechanism and the second positioning mechanism include:

[0016] A pushing component is disposed on one side of the conveying mechanism and has a retractable push plate for pushing the products to be stacked toward the other side of the conveying mechanism.

[0017] A guide component is disposed on the other side of the conveying mechanism and has a guide plate parallel to the push plate.

[0018] Furthermore, one end of both the push plate and the guide plate is bent in the opposite direction to form a guide slope.

[0019] The pre-stacking device also includes a blocking mechanism that, when extended, blocks the product to be stacked from entering the restricted pre-storage position and the active pre-storage position.

[0020] The conveying mechanism includes: a conveyor frame, multiple conveyor rollers mounted on the conveyor frame and spaced apart along the conveying direction of the conveyor frame, a drive component for driving the conveyor rollers to rotate, and the stacked products are placed on the conveyor rollers and moved by the rotation of the conveyor rollers.

[0021] Preferably, the limiting mechanism is a lifting mechanism, used to lift the products to be stacked that are located in the pre-stored limiting position.

[0022] This utility model also proposes an assembly device, including the aforementioned pre-stacking device.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] Through the coordinated action of the conveying mechanism, positioning mechanism group, and limiting mechanism, the position of products conveyed in a single row can be adjusted during the conveying process, so that multiple products are arranged side by side after being conveyed to their positions. This allows the palletizing robot to pick up at least two products for palletizing simultaneously, improving palletizing efficiency. At the same time, through reasonable limiting and positioning, the device reduces waiting time and operational errors during the palletizing process, providing stable support for automated production lines. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of the present utility model;

[0027] Figure 2 This is a top view of an embodiment of the present utility model;

[0028] Figure 3 This is a front view of an embodiment of the present utility model;

[0029] Figure 4 This is a left view of an embodiment of the present utility model;

[0030] Figure 5 This is a right view of an embodiment of the present utility model;

[0031] 1. Conveying mechanism;

[0032] 11. Conveyor frame; 12. Conveyor roller;

[0033] 201. First positioning mechanism; 202. Second positioning mechanism;

[0034] 21. Pushing component; 211. Push plate; 22. Guiding component; 221. Guide plate;

[0035] 31. Lifting mechanism;

[0036] 4. Suction cup clamp;

[0037] 41. Connecting post; 42. First suction cup; 43. Second suction cup;

[0038] 5. Products awaiting stacking;

[0039] 61. Limited pre-store bit; 62. Active pre-store bit;

[0040] 7. Blocking mechanism. Detailed Implementation

[0041] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0042] The principle and structure of this utility model will be described in detail below with reference to the accompanying drawings and embodiments.

[0043] In traditional handling methods, palletizing robots may need to retrieve products one by one from a single location, resulting in frequent waiting and operational gaps, making them unsuitable for automated production scenarios that require rapid and continuous processing of large quantities of products.

[0044] In this regard, such as Figure 1 , 2 As shown, this utility model proposes a pre-stacking device, comprising: a conveying mechanism 1, a positioning mechanism group, and a limiting mechanism. Wherein:

[0045] One end of the conveying mechanism 1 is connected to the production line body to receive the products 5 to be stacked from the production line body and convey them to a designated position. The conveying mechanism 1 has at least one restricted pre-storage position 61 and one active pre-storage position 62 at the docking position with the palletizing robot. The restricted pre-storage position 61 and the active pre-storage position 62 are arranged side-by-side (if there are multiple restricted pre-storage positions, they are arranged side-by-side with the active pre-storage position) to facilitate product transfer and retrieval. A positioning mechanism group is arranged on the transmission path of the conveying mechanism 1 to adjust the position of the products 5 to be stacked. Through the adjustment of the positioning mechanism group, the products 5 to be stacked can be guided to the active pre-storage position 62; simultaneously, the positioning mechanism group can also move the products 5 to be stacked located at the active pre-storage position 62 to the restricted pre-storage position 61. A limiting mechanism is used to limit the products to be stacked located at the restricted pre-storage position 61, preventing them from being carried away from the restricted pre-storage position 61 by the conveying mechanism when not in use. The limiting mechanism can be a stop, clamping device, or other fixing structure.

[0046] Through the coordinated action of the conveying mechanism, positioning mechanism group, and limiting mechanism, the pre-stacking device can adjust the position of products conveyed in a single row during the conveying process, so that multiple products are arranged side by side after being conveyed to their positions. This allows the palletizing robot to pick up at least two products for palletizing at the same time, improving palletizing efficiency. At the same time, through reasonable position management and product restrictions, the device reduces waiting time and operational errors during the palletizing process, providing stable support for automated production lines.

[0047] In addition, the transmission path of the conveying mechanism 1 can be optimized according to the output speed of the production line and the working rhythm of the palletizing robot to ensure that the products can reach the predetermined position smoothly and efficiently.

[0048] like Figure 1 , 4 As shown in Figure 5, the pre-stacking device further includes a suction cup gripper 4 to optimize the handling process of the products to be stacked and improve palletizing efficiency. Specifically, the suction cup gripper 4 is positioned above the location where the conveying mechanism 1 docks with the palletizing robot. The suction cup gripper 4 can simultaneously cover the space above both the restricted pre-storage position and the active pre-storage position, thereby enabling synchronous gripping and handling of the products to be stacked at these two positions.

[0049] The suction cup gripper 4 simultaneously picks up and lifts the products to be stacked from both the restricted and active pre-storage positions, allowing the palletizing robot to handle them. Its installation position is located at the end of the conveying mechanism 1 near the palletizing robot, directly above the restricted and active pre-storage positions, ensuring that the suction cup gripper 4 can contact and pick up products from both positions in a single operation. Through the suction force of the suction cup gripper 4, the products to be stacked are firmly grasped, and then the robotic arm or related transmission mechanism lifts the products together for easy handling by the palletizing robot. This reduces the number of handling operations and shortens the time required for the palletizing robot to acquire products.

[0050] In a specific embodiment, the suction cup clamp 4 includes a first suction cup 42 and a second suction cup 43 arranged side by side, and a connecting post 41. Both the first suction cup 42 and the second suction cup 43 are used to adsorb products to be stacked. The connecting post 41 is fixed between the first suction cup 42 and the second suction cup 43, serving as a connection and support to ensure that the two suction cups maintain a stable relative position during handling. The suction cup clamp 4 can adsorb two products simultaneously, thereby improving handling efficiency.

[0051] The first suction cup 42 and the second suction cup 43 both include: two suction cup components and crossbars connected to the top of the two suction cup components at the same time. The suction cup components are arranged at intervals. A crossbeam plate is set at the bottom of the connecting column 41 and is connected to the bottom surface of the middle part of the two crossbars (each corresponding to one suction cup), so that the two suction cups can be lifted and lowered at the same time through the connecting column 41.

[0052] Preferably, the first suction cup 42 and the second suction cup 43 are made of wear-resistant and durable materials to withstand long-term, high-frequency use. The connecting post 41 can be made of metal to provide sufficient strength and stability.

[0053] The specific implementation of the positioning mechanism group may include a guiding device, a pushing mechanism or other adjustment components, which serve to ensure that the product can be accurately assigned to the limit pre-stored position or the active pre-stored position during the transfer process.

[0054] In specific embodiments, such as Figure 2 , 3 As shown, the positioning mechanism group includes a first positioning mechanism 201 and a second positioning mechanism 202. The structures of the first positioning mechanism 201 and the second positioning mechanism 202 may be the same or different.

[0055] The function of the first positioning mechanism 201 is to push the product to be stacked along a direction perpendicular to the conveying direction of the conveying mechanism 1. This ensures that the product to be stacked remains on the predetermined path during the conveying process, thereby avoiding the impact of positional deviation on subsequent stacking operations.

[0056] Through the coordinated action of the first and second positioning mechanisms, the positioning mechanism group can efficiently complete the positioning and movement operations of products to be stacked. On the one hand, the first positioning mechanism optimizes the product's conveying path through vertical pushing; on the other hand, the second positioning mechanism achieves fixed-position storage of the product through precise pushing. This bidirectional positioning function not only improves the flexibility of product conveying and storage but also significantly enhances the overall efficiency of the pre-stacking device, reducing the need for manual intervention.

[0057] The specific transmission and positioning workflow is as follows:

[0058] When a product 5 to be stacked reaches the position of the first positioning mechanism, the first positioning mechanism pushes the product 5 perpendicular to the conveying direction of the conveying mechanism 1, so that the product is conveyed to the side of the conveying mechanism 1. Then it continues to be conveyed along the conveying mechanism 1 to the active pre-storage position 62. Then the second positioning mechanism pushes the product 5 perpendicular to the conveying direction of the conveying mechanism 1 (opposite to the direction of the first positioning mechanism), so that the product 5 is sent to the restricted pre-storage position 61 and then lifted to separate it from the conveying surface of the conveying mechanism 1. When the second product 5 to be stacked reaches the position of the first positioning mechanism, the first positioning mechanism pushes the product 5 perpendicular to the conveying direction of the conveying mechanism 1, so that the product is conveyed to the side of the conveying mechanism 1. Then it continues to be conveyed along the conveying mechanism 1 to the active pre-storage position 62. At this time, the two products 5 to be stacked are placed side by side, located at the active pre-storage position 62 and the restricted pre-storage position 61 respectively. Then they are moved away simultaneously by suction cup clamps. Then the workflow is repeated.

[0059] The first positioning mechanism 201 and the second positioning mechanism 202 can be driven by pneumatic, electric, or mechanical transmission, depending on actual needs. Their design must ensure that the driving force is moderate, effectively adjusting the product position without damaging or deforming it. This adjustment function provides a precise positioning basis for products to be stacked to enter the pre-storage or pick-up / placement position.

[0060] Specifically, the first positioning mechanism 201 and the second positioning mechanism 202 have the same structure, both including a pushing component 21 and a guiding component 22;

[0061] A pushing component 21 is disposed on one side of the conveying mechanism 1 and has a retractable pusher plate 211 for pushing the products to be stacked to the other side of the conveying mechanism 1. The pushing component 21 achieves the extension and retraction of the pusher plate 211 through mechanical or pneumatic drive, allowing the pusher plate 211 to precisely move the products to be stacked to the target position. The extension length and pushing force of the pusher plate 211 can be adjusted according to the size of the products to be stacked and the conveying requirements, thereby ensuring the flexibility and accuracy of the pushing operation.

[0062] The guide component 22 is located on the other side of the conveying mechanism 1 and has a guide plate 221 parallel to the push plate 211. The guide plate 221 assists the push component 21 in completing the positioning operation of the product to be stacked, ensuring that the product moves along the correct path after being pushed. The guide plate 221 is arranged parallel to the push plate 211, forming a guiding and restraining function to prevent the product to be stacked from deviating or tilting during the pushing process.

[0063] In a further embodiment, one end of both the push plate 211 and the guide plate 221 is bent in the opposite direction to form a guide ramp. The guide ramp of the push plate 211, by bending in the opposite direction, and the guide ramp of the guide plate 221 working together with the guide ramp of the push plate 211, form a flared guide structure, reducing damage to the products to be stacked due to friction or collision during movement.

[0064] Specifically, the guide component 22 includes: two guide seats arranged at intervals along the conveying direction on the conveying mechanism 1, the top of the guide seats having guide holes perpendicular to the conveying direction, and two guide rods vertically connected to the side of the guide plate 221 facing away from the product and inserted into the guide holes, and can be fixed by guide seat screws, thereby adjusting the extension position of the guide plate.

[0065] In a preferred embodiment, the restricted pre-storage position can be specifically designed as one, meaning that the conveying mechanism 1 can simultaneously accommodate two products to be stacked located at the restricted pre-storage position and the active pre-storage position. By arranging them side by side, the conveying and delivery of products to be stacked can be completed efficiently, improving the efficiency of palletizing operations. This reduces the downtime of the palletizing robot due to waiting for products, thereby further improving the operating efficiency and automation level of the entire production line.

[0066] The device also includes a blocking mechanism 7, which extends to block the product to be stacked from entering the restricted pre-storage position and the active pre-storage position. When the first positioning mechanism pushes the product to be stacked to a position that is in contact with the guide plate 221, the blocking mechanism descends, allowing the product to be stacked to directly enter the active pre-storage position. By setting up the blocking mechanism, the product to be stacked is prevented from entering the area of ​​the active pre-storage position or the restricted pre-storage position before it has been fully pushed into place, thus avoiding proper placement or collision with products already placed in that area.

[0067] The blocking mechanism 7 can be a long strip baffle, which is set between two adjacent conveyor rollers of the conveying mechanism and is parallel to the conveyor rollers. It is lifted and lowered by a cylinder, thereby achieving the effect of blocking the products to be stacked.

[0068] Specifically, the conveying mechanism 1 includes: a conveyor frame 11, a conveyor roller 12, and a drive component (not shown in the figure). Wherein:

[0069] The conveyor frame 11 is used to support and fix other components. The length and width of the conveyor frame 11 can be designed according to the size of the products to be stacked and the conveying requirements to meet conveying tasks of different scales. Multiple conveyor rollers 12 are spaced apart on the conveyor frame 11 along the conveying direction. The conveyor rollers 12 use rolling or sliding methods to support and drive the movement of the products to be stacked. The spacing and arrangement of the conveyor rollers 12 can be adjusted according to the size, weight, and conveying speed requirements of the products to be stacked to ensure smooth movement of the products during conveying. A drive unit is used to drive the rotation of the conveyor rollers 12. The drive unit can be an electric motor or other drive device, transmitting power to enable the conveyor rollers 12 to achieve continuous rotation or intermittent movement. The rotational speed and driving torque of the drive unit can be adjusted according to the conveying requirements to accommodate products of different weights and sizes to be stacked.

[0070] During the conveying process, the products to be stacked move smoothly by relying on the rolling or sliding of the conveyor roller 12, which also facilitates the adjustment of the product position by the pushing component and improves the pushing efficiency.

[0071] In a preferred embodiment, the limiting mechanism is a lifting mechanism 31, used to lift the product to be stacked located in the limiting pre-storage position. The lifting mechanism 31 lifts the product to be stacked in the limiting pre-storage position vertically by mechanical or pneumatic drive, so that it is separated from the conveying roller 12 of the conveying mechanism, thereby preventing the product to be stacked from being moved by the conveying roller 12, thus achieving the purpose of limiting.

[0072] The driving method of the lifting mechanism 31 can be selected according to specific needs, such as using an electric cylinder or a pneumatic cylinder, to ensure the flexibility and reliability of the lifting operation. The lifting mechanism 31 avoids damage to the product due to mechanical operation and can complete the lifting operation without affecting the integrity of the product. At the same time, the coordinated action of the lifting mechanism 31 with the conveying mechanism 1 and the positioning mechanism ensures the efficient operation of the entire pre-stacking device.

[0073] This utility model also proposes an assembly device, including the aforementioned pre-stacking device, as well as a production line body, a palletizing robot, and other components. It is mainly used for the assembly and packaging of the internal units of air conditioner split units.

[0074] It should be noted that the terminology used above is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0075] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0076] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0077] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0078] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this utility model. The above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. For those skilled in the art, this utility model can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A pre-stacking device, characterized in that, include: A conveying mechanism is used to receive and convey products to be stacked on the production line, and the position of the conveying mechanism to dock with the palletizing robot includes at least one restricted pre-storage position and an active pre-storage position adjacent to the restricted pre-storage position. A positioning mechanism group is disposed on the transmission path of the conveying mechanism, used to adjust the position of the product to be stacked, so that the product to be stacked after passing through the positioning mechanism group can be conveyed to the active pre-storage position, and can move the product to be stacked in the active pre-storage position to the restricted pre-storage position. The limiting mechanism is used to limit the products to be stacked in the limiting pre-storage position, so that the products to be stacked remain in the limiting pre-storage position.

2. The pre-stacking device as described in claim 1, characterized in that, Also includes: suction cups The clamp, the suction cup clamp, is positioned above the location where the conveying mechanism docks with the palletizing robot, and is used to simultaneously transport products to be stacked from the restricted pre-storage position and the active pre-storage position to the palletizing robot.

3. The pre-stacking device as described in claim 2, characterized in that, The suction cup clamp includes: a first suction cup and a second suction cup arranged side by side for adsorbing products to be stacked, and a connecting post connecting the first suction cup and the second suction cup.

4. The pre-stacking device as described in claim 1, characterized in that, The positioning mechanism group includes: The first positioning mechanism can push the product to be stacked along the conveying direction perpendicular to the conveying mechanism, so that the product to be stacked is conveyed to the active pre-storage position on the side close to the conveying mechanism. The second positioning mechanism can push the product to be stacked, which is located in the active pre-storage position, to the restricted pre-storage position.

5. The pre-stacking device as described in claim 4, characterized in that, Both the first positioning mechanism and the second positioning mechanism include: A pushing component is disposed on one side of the conveying mechanism and has a retractable push plate for pushing the products to be stacked to the other side of the conveying mechanism. A guide component is disposed on the other side of the conveying mechanism and has a guide plate parallel to the push plate.

6. The pre-stacking device as described in claim 5, characterized in that, One end of both the push plate and the guide plate is bent in opposite directions to form a guide slope.

7. The pre-stacking device as described in claim 1, characterized in that, It also includes a blocking mechanism that, when extended, blocks the product to be stacked from entering the restricted pre-storage position and the active pre-storage position.

8. The pre-stacking device as claimed in claim 1, characterized in that, The conveying mechanism includes: a conveying frame, multiple conveying rollers mounted on the conveying frame and spaced apart along the conveying direction of the conveying frame, a driving component for driving the conveying rollers to rotate, and the product to be stacked is placed on the conveying rollers and moved by the rotation of the conveying rollers.

9. The pre-stacking device as claimed in claim 1, characterized in that, The limiting mechanism is a lifting mechanism used to lift the products to be stacked that are located in the pre-stored limiting position.

10. An assembly device, characterized in that, Includes the pre-stacking device as described in any one of claims 1 to 9.

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