PP box stacking and transferring device

Abstract

The invention relates to the technical field of logistics conveying, and provides a PP box stacking and transferring device which comprises a base, a stand column, a mounting base and a platform, the stand column and the mounting base are arranged on the base, the platform is located between the mounting base and the stand column, a lifting plate capable of ascending and descending in the vertical direction is slidably connected to the mounting base, and a shifting fork used for bearing a box is connected to the lifting plate; a driving shaft is rotationally installed on the base, a gear and an eccentric wheel are fixedly installed on the driving shaft, and the rim of the eccentric wheel abuts against the bottom of the platform; the lower portion of the lifting plate is connected with a rack vertically extending downwards, the position of the rack corresponds to the gear, and when the lifting plate descends to a preset position, the rack is meshed with the gear to drive the driving shaft to rotate and drive the eccentric wheel to rotate, so that the jacking platform generates inclined motion.

Description

Technical Field

[0001] This invention relates to the field of logistics transportation technology, and specifically to a PP box stacking and transfer device. Background Technology

[0002] In automated warehousing and production logistics, the stacking and transfer of PP boxes (polypropylene turnover boxes) is a critical process. Traditional box transfer equipment typically uses multiple independent drive systems to separately complete the two actions of "vertical lifting and stacking" and "lateral tilting and unloading". Specifically, the lifting mechanism is controlled by a motor or hydraulic system, while the unloading and tilting mechanism often requires an additional cylinder or push rod motor;

[0003] Because lifting and tilting rely on independent power sources, the equipment is bulky and requires a complex sensor network and PLC program to strictly control the timing of actions. If sensors malfunction or there is a signal delay, the unloading mechanism can easily actuate prematurely before the lifting plate is fully in position, causing the container to jam or the equipment to collide. Furthermore, tilting unloading mechanisms, especially cylinder-driven types, typically move at a constant speed or with sudden acceleration. At the moment of initiation of tilting, static friction abruptly changes into dynamic friction, easily causing violent shaking of the container; and at the end of tilting, the platform often experiences a hard impact with the limit block. This unloading method, lacking flexible speed control, easily damages the contents of PP containers containing precision parts or fragile items. Therefore, we propose a PP container stacking and transfer device. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the present invention provides a PP box stacking and transfer device, which overcomes the shortcomings of the prior art, has a reasonable design and compact structure, and solves the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A PP box stacking and transfer device includes a base, a column and a mounting seat disposed on the base, and a platform located between the mounting seat and the column. A lifting plate that can be raised and lowered in the vertical direction is slidably connected to the mounting seat, and a fork for supporting the box is connected to the lifting plate.

[0007] A drive shaft is rotatably mounted on the base, and a gear and an eccentric wheel are fixedly mounted on the drive shaft. The rim of the eccentric wheel abuts against the bottom of the platform.

[0008] The lower part of the lifting platform is connected to a rack extending vertically downwards. The rack is positioned to correspond to the gear. When the lifting platform descends to the predetermined position, the rack meshes with the gear, driving the drive shaft to rotate, which in turn drives the eccentric wheel to rotate, thereby lifting the platform to produce a tilting motion.

[0009] Preferably, the radius of curvature of the eccentric wheel varies non-linearly along its rotation direction, forming an initial segment, a middle segment, and a final segment in sequence. The rate of change of the radius of curvature in the initial segment is less than that in the middle segment, so that the angular velocity of the platform at the beginning of tilting is less than that in the middle segment of tilting, and gradually decreases during the tilting termination stage.

[0010] Preferably, a grid is slidably connected to the column, and a rotating shaft and a grooved wheel are provided at the top of the column; a rope is connected between the grid and the lifting plate, and the rope passes around the grooved wheel so that when the lifting plate descends, the grid is pulled up along the column by the rope.

[0011] Preferably, the lifting plate is fixedly connected to connecting rods extending to both sides, and one end of the rope is fixedly connected to the connecting rod to avoid the stacking space of the boxes.

[0012] Preferably, the platform is hinged to the base via a shaft, and the upper surface of the platform is equipped with several rows of pulleys for conveying the boxes; the platform is also provided with through slots corresponding to the positions of the shift forks, so that when the lifting plate descends, the shift forks can pass through the through slots and descend below the platform.

[0013] Preferably, gears are located at both ends of the drive shaft, and racks are correspondingly arranged in two sets, located on both sides of the lifting plate.

[0014] Preferably, the rack engages with the gear only when the lifting plate moves downward to a predetermined range, and disengages from the gear during the upward return of the lifting plate, so that the platform remains in its original position when the lifting plate rises.

[0015] Preferably, the eccentric wheel and the bottom of the platform are in continuous contact, so that the force on the platform changes continuously during the tilting process.

[0016] Preferably, the rack is positioned in an area below the lowest working position of the shift fork.

[0017] This invention provides a PP box stacking and transfer device. It has the following advantages:

[0018] 1. Through a gravity interlocking mechanism between the grille and the lifting platform, the grille is lifted level by level along the columns as the lifting platform descends and stacks. This design ensures that the lateral support height increases synchronously with the stacking height, effectively acting as a dynamic lateral baffle. It cleverly solves the problem of the container easily tipping backward due to instability during the stacking and descent process, playing a crucial role in limiting and protecting the structure without requiring an additional power source or complex sensor control.

[0019] 2. By installing a rack at the bottom of the lifting plate and a gear and eccentric wheel on the drive shaft, this invention converts vertical lifting motion into platform tilting rotational motion. The rack only drives the gear to engage after the box has been smoothly transferred to the platform pulley block. This mechanical sequential control ensures that the box transfer and tilting unloading processes do not interfere with each other and are seamlessly connected, greatly simplifying the equipment's drive system and reducing manufacturing costs and maintenance difficulty.

[0020] 3. A special non-linear profile design was implemented for the eccentric wheel driving the platform's tilt. In the initial tilting phase, the rate of change of the profile's radius of curvature is small, allowing the platform to tilt slowly, eliminating abrupt changes in static friction and preventing the container from slipping or collapsing due to sudden and violent tilting. Acceleration occurs in the middle phase to improve unloading efficiency; and deceleration occurs again in the final phase to avoid a hard impact between the platform and the limiting structure. This segmented speed control significantly improves the safety of transferring precision or fragile PP containers. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention;

[0022] Figure 2 For the present invention Figure 1 A three-dimensional schematic diagram;

[0023] Figure 3 For the present invention Figure 2 Partial schematic diagram;

[0024] Figure 4 For the present invention Figure 3 Partial schematic diagram;

[0025] Figure 5 For the present invention Figure 4 A partial schematic diagram.

[0026] In the diagram: 1. Base; 11. Stop bar; 2. Column; 21. Grille; 22. Shaft; 23. Grooved wheel; 24. Rope; 25. Strip groove; 3. Mounting seat; 31. Lifting plate; 32. Shift fork; 33. Connecting rod; 34. Rack; 4. Platform; 41. Shaft; 42. Pulley block; 43. Through groove; 5. Drive shaft; 51. Gear; 52. Eccentric wheel. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, what is described is only a part of this invention, not all of it. All other works obtained by those skilled in the art based on this invention without inventive effort are within the scope of protection of this invention.

[0028] See attached document Figures 1-5A PP box stacking and transfer device includes a base 1, a column 2, a mounting base 3, a platform 4, and a drive shaft 5;

[0029] The base 1 serves as the supporting structure for this device. A pair of columns 2 and a mounting base 3 are fixedly mounted on the base 1. A stop bar 11 is also connected to the other end of the base 1 corresponding to the mounting base 3. The mounting base 3 and the columns 2 are correspondingly arranged, with space between them to accommodate the platform 4. To achieve smooth lifting and lowering of the components, a first guide rail is vertically arranged on the side wall of the column 2. The grille 21 has first sliders on both sides that match the first guide rail, allowing the grille 21 to slide and rise vertically on the column 2 via the sliders. Similarly, a second guide rail is vertically arranged on the inner side wall of the mounting base 3. The lifting plate 31 is slidably connected to the mounting base 3 via a second slider on its back, enabling vertical displacement of the lifting plate 31.

[0030] The tops of the two columns 2 are rotatably connected to the same shaft 22. A grooved wheel 23 is fixedly fitted on the shaft 22. One end of the rope 24 is connected to the top of the grille 21, and the other end passes around the grooved wheel 23 and is connected to the lifting plate 31. Each column 2 also has a strip groove 25 on its top for the rope 24 to pass through. The lifting plate 31 is also connected to a pair of parallel forks 32 extending towards the columns 2. This design constitutes a gravity interlocking linkage mechanism between the grille 21 and the lifting plate 31: when the lifting plate 31 descends, the grille 21 is pulled up by the rope 24; and vice versa.

[0031] A platform 4 is provided on the base 1, located between the mounting base 3 and the column 2. The platform 4 is hinged to the base 1 via a shaft 41, and the shaft 41 is connected to the two columns 2 via bearings, allowing the platform 4 to tilt and rotate around the shaft 41. Several rows of pulleys 42 are installed on the upper surface of the platform 4 for conveying the box. The platform 4 also has a through slot 43 corresponding to the position of the shift fork 32, allowing the shift fork 32 to pass through.

[0032] To prevent the box from being blocked by the rope 24 when it is transferred to the fork by the conveyor, a connecting rod 33 is connected to the lifting plate 31. The connecting rod 33 extends to both sides of the lifting plate 31, and the fixing points of the rope 24 of the lifting plate 31 are located on the connecting rods 33 on both sides.

[0033] The drive shaft 5 is rotatably mounted on the base 1 via a bearing housing. A gear 51 and an eccentric wheel 52 are fixedly mounted on the drive shaft 5. The gear 51 is located at both ends of the drive shaft 5, and the eccentric wheel 52 is located in the middle of the drive shaft 5 and abuts against the platform 4. The eccentric wheel 52 and the bottom of the platform 4 have continuous contact, causing the platform 4 to experience continuous force changes during tilting. A rack 34 is connected to the lowest part of the lifting plate 31. The rack 34 extends vertically downwards, and its position corresponds to that of the gear 51. When the rack 34 descends and meshes with the gear 51, it drives the eccentric wheel 52 to rotate, thereby driving the platform 4 to deflect around the shaft 41, facilitating the transfer of the housing.

[0034] Example 2

[0035] This embodiment focuses on describing the operation process of the device and the special design of the eccentric wheel 52.

[0036] 1. Initial and Stacking Stage: In the initial state, the lifting plate 31 is located at the high position of the mounting base 3, and the grid 21 on the column 2 is located at the low position through the traction of the rope 24. During operation, an external drive device, such as a cylinder, motor screw, etc. (not shown in the figure), controls the lifting plate 31 to slowly descend on the mounting base 3. The boxes are stacked one by one on the forks 32 extending outward from the lifting plate 31.

[0037] 2. Linkage Protection Phase: As the lifting platform 31 descends step by step, the rope 24 pulls the grille 21 up along the column 2 step by step. At this time, the raised grille 21 is located on one side of the stacked boxes, acting as a lateral baffle. This design cleverly solves the problem that the boxes are prone to tipping to one side of the column 2 due to instability during the stacking and descent process. The grille 21 plays a crucial role in limiting and protecting the boxes.

[0038] 3. Transmission Switching and Unloading Stage: When the lifting plate 31 descends to the predetermined height, the shift fork 32 carries the box body through the through slot 43 of the platform 4 and continues to descend until it is below the surface of the platform 4. At this time, the box body is smoothly transferred and supported on the pulley group 42 on the surface of the platform 4, and the grid 21 rises to the high position. The stacked box body will not contact the lowest point of the grid 21. At the same time, the rack 34 under the lifting plate 31 begins to mesh with the gear 51 on the drive shaft 5. As the lifting plate 31 continues to descend, the rack 34 drives the gear 51 to rotate, which in turn drives the drive shaft 5 and the eccentric wheel 52 to rotate.

[0039] 4. Nonlinear control of the eccentric wheel: The rotating eccentric wheel 52 lifts the bottom of the platform 4, forcing the platform 4 to tilt around the shaft 41. To ensure the stability of the box during the tilting unloading process, this invention incorporates a nonlinear control design for the profile shape of the eccentric wheel 52:

[0040] Initial stage: The rate of change of the radius of curvature in the initial working section where the eccentric wheel 52 contacts the platform 4 is relatively small. This means that when the gear 51 just begins to rotate, the tilt angle of the platform 4 increases slowly. This design is to eliminate abrupt changes in static friction and prevent the housing from slipping or collapsing due to sudden and violent tilting of the platform.

[0041] Middle section: As the eccentric wheel 52 rotates through a certain angle, its contour radius changes at a higher rate, driving the platform 4 to quickly reach the predetermined tilt angle. Gravity is used to make the box slide quickly to the left along the pulley block 42, improving unloading efficiency.

[0042] Final stage: As the tilt angle approaches its maximum, the contour design of the eccentric wheel 52 further slows down the tilting speed, preventing the platform 4 from having a hard impact with the limiting structure.

[0043] Finally, the stacked boxes slide along the pulley block 42 on the inclined platform 4 to the other side of the grid 21, that is, towards the stop bar 11, to complete the unloading.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0045] The above description is only used to illustrate the technical solutions of the present invention, and is not intended to limit them. Although the present invention has been described in detail with reference to the foregoing, those skilled in the art should understand that modifications can still be made to the foregoing technical solutions, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A PP box stacking and transfer device, comprising a base (1), a column (2) and a mounting base (3) disposed on the base (1), and a platform (4) located between the mounting base (3) and the column (2); Its features are: The mounting base (3) is slidably connected to a lifting plate (31) that can be raised and lowered in the vertical direction, and the lifting plate (31) is connected to a fork (32) for supporting the box body. A drive shaft (5) is rotatably mounted on the base (1). A gear (51) and an eccentric wheel (52) are fixedly mounted on the drive shaft (5). The rim of the eccentric wheel (52) abuts against the bottom of the platform (4). The lower part of the lifting plate (31) is connected to a rack (34) extending vertically downward. The position of the rack (34) corresponds to the gear (51). When the lifting plate (31) descends to the predetermined position, the rack (34) meshes with the gear (51), drives the drive shaft (5) to rotate, drives the eccentric wheel (52) to rotate, thereby lifting the platform (4) to produce tilting motion.

2. The PP box stacking and transfer device as described in claim 1, characterized in that: The radius of curvature of the eccentric wheel (52) changes nonlinearly along its rotation direction and forms an initial section, a middle section and an end section in sequence. The rate of change of the radius of curvature of the initial section is less than that of the middle section, so that the angular velocity of the platform (4) at the beginning of the tilt is less than that of the middle section of the tilt, and gradually decreases at the end of the tilt.

3. The PP box stacking and transfer device as described in claim 1, characterized in that: A grid (21) is slidably connected to the column (2). The top of the column (2) is provided with a rotating shaft (22) and a grooved wheel (23). A rope (24) is connected between the grid (21) and the lifting plate (31). The rope (24) passes around the grooved wheel (23), so that when the lifting plate (31) descends, the grid (21) is pulled up along the column (2) by the rope (24).

4. The PP box stacking and transfer device as described in claim 3, characterized in that: A connecting rod (33) extending to both sides is fixedly connected to the lifting plate (31), and one end of the rope (24) is fixedly connected to the connecting rod (33) to avoid the stacking space of the box.

5. The PP box stacking and transfer device as described in claim 1, characterized in that: Platform (4) is hinged to base (1) via shaft (41). Several rows of pulleys (42) for conveying boxes are installed on the upper surface of platform (4). Platform (4) is also provided with through slots (43) corresponding to the positions of shift forks (32). When the lifting plate (31) descends, shift forks (32) can pass through through slots (43) and descend below platform (4).

6. The PP box stacking and transfer device as described in claim 1, characterized in that: Gears (51) are located at both ends of the drive shaft (5), and racks (34) are set in two sets, located on both sides of the lifting plate (31).

7. The PP box stacking and transfer device as described in claim 1, characterized in that: The rack (34) engages with the gear (51) only when the lifting plate (31) moves downward to the predetermined range, and disengages from the gear (51) during the upward return of the lifting plate (31), so that the platform (4) remains in the original position when the lifting plate (31) rises.

8. The PP box stacking and transfer device as described in claim 1, characterized in that: The eccentric wheel (52) and the bottom of the platform (4) are in continuous contact, so that the force on the platform (4) changes continuously during the tilting process.

9. A PP box stacking and transfer device as described in claim 1, characterized in that: The rack (34) is positioned in an area below the lowest working position of the shift fork (32).

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