Tray feeding and discharging system
By designing a pallet loading and unloading system, the problem of increased automation loading difficulty caused by stacked pallets was solved, and efficient pallet conveying, separation and stacking were achieved, improving the efficiency of automated loading and storage.
Patent Information
- Application Number
- CN202520255806.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-18
- Publication Date
- 2026-01-09
- Estimated Expiration
- 2035-02-18
AI Technical Summary
In 3C product manufacturing, stacked pallets increase the difficulty of automated loading operations, and existing technologies are unable to efficiently load and unload pallets.
A pallet loading and unloading system was designed, including a conveying device, a lifting device, and a pallet stacking device, which realizes an automated loading and unloading process by conveying, separating, and stacking pallets.
It enables efficient pallet conveying, separation, and stacking, improving the efficiency of automated feeding, reducing floor space, and increasing storage efficiency.
Smart Images
Figure CN223779469U_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to a pallet loading and unloading system, belonging to the field of automation equipment technology. Background Technology
[0002] With technological advancements, more and more factories are adopting automated equipment to manufacture products. This is especially true in the production of 3C products, where automated equipment has become widespread.
[0003] In the process of automated equipment manufacturing products, automated material loading is the most crucial link in the entire production process. However, some components of 3C products are generally placed in pallets, and these pallets are stacked, which increases the difficulty of automated material loading operations.
[0004] Therefore, it is necessary to develop a pallet loading and unloading system to enable materials in pallets to be loaded and unloaded efficiently. Utility Model Content
[0005] This disclosure provides a pallet loading and unloading system.
[0006] According to one aspect of this disclosure, a pallet loading and unloading system is provided, comprising:
[0007] A conveying device, comprising a loading station, a handling station, and a unloading station, wherein the loading station, the handling station, and the unloading station are arranged sequentially along the conveying direction of the conveying device;
[0008] A first lifting device is located at the loading station to drive the stacked pallets to rise or fall.
[0009] The tray separating device is disposed on the conveying device and is used to separate stacked pallets, wherein the separated pallets are conveyed by the conveying device.
[0010] A second lifting device, located at the unloading station, is used to drive the pallet upwards; and
[0011] A pallet stacking device is provided on the conveying device and is used to stack pallets at the unloading station.
[0012] According to at least one embodiment of the pallet loading and unloading system of the present disclosure, the conveying device includes:
[0013] First support plate,
[0014] A second support plate is provided at a distance from the first support plate;
[0015] A first conveying assembly, wherein the first conveying assembly is disposed on the first support plate; and
[0016] The second conveying component is disposed on the second support plate, wherein both the first conveying component and the second conveying component are located between the first support plate and the second support plate.
[0017] According to at least one embodiment of the pallet loading and unloading system of the present disclosure, the first conveying component and the second conveying component are belt conveying components, and the first conveying component and the second conveying component are driven by the same conveying drive device.
[0018] According to at least one embodiment of the pallet loading and unloading system of the present disclosure, the pallet separating device includes a first pallet separating component and a second pallet separating component, the first pallet separating component and the second pallet separating component having the same structure and being symmetrically arranged; wherein, the first pallet separating component is disposed on the first support plate, and the second pallet separating component is disposed on the second support plate.
[0019] According to at least one embodiment of the pallet loading and unloading system of this disclosure, the first pallet separating component includes:
[0020] The tray support frame is disposed on the first support plate;
[0021] The disk drive device is disposed on the disk support frame;
[0022] The tray divider is driven by a tray divider drive device to move the tray divider so that the tray divider can approach or move away from the tray.
[0023] According to at least one embodiment of the pallet loading and unloading system of the present disclosure, the pallet stacking device includes a first pallet stacking assembly and a second pallet stacking assembly, the first pallet stacking assembly and the second pallet stacking assembly having the same structure and being symmetrically arranged; wherein, the first pallet stacking assembly is disposed on the first support plate, and the second pallet stacking assembly is disposed on the second support plate.
[0024] According to at least one embodiment of the pallet loading and unloading system of this disclosure, the first pallet stacking assembly includes:
[0025] A stacking tray support frame, wherein the stacking tray support frame is disposed on the first support plate;
[0026] A tray holder is rotatably mounted on a tray support frame, wherein the tray holder is constrained by the tray support frame to a first position so that the tray holder will not exceed the first position when rotating.
[0027] According to at least one embodiment of the pallet loading and unloading system of the present disclosure, the pallet support frame includes a limiting surface for limiting the pallet tray to a first position, wherein, when the pallet tray is in the first position, the upper surface of the pallet tray is disposed substantially horizontally.
[0028] The pallet loading and unloading system according to at least one embodiment of the present disclosure further includes:
[0029] The third lifting device is located at the handling station and is used to drive the pallet to rise.
[0030] The pallet loading and unloading system according to at least one embodiment of the present disclosure further includes:
[0031] A blocking device is provided to block the pallets being transported by the conveying device, wherein the blocking device is located downstream of the third lifting device along the direction in which the pallets are transported by the conveying device. Attached Figure Description
[0032] The accompanying drawings illustrate exemplary embodiments of the present disclosure and, together with the description thereof, serve to explain the principles of the present disclosure. These drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this specification.
[0033] Figure 1 This is a schematic diagram of the usage state of a pallet loading and unloading system according to one embodiment of the present disclosure.
[0034] Figure 2 This is a schematic diagram of a pallet loading and unloading system according to one embodiment of the present disclosure.
[0035] Figure 3 This is a schematic diagram of the structure of the first tray assembly of a pallet loading and unloading system according to one embodiment of the present disclosure.
[0036] Figure 4 This is a schematic diagram of the structure of the first pallet stacking assembly of a pallet loading and unloading system according to one embodiment of the present disclosure.
[0037] Figure 5 This is a schematic diagram of the structure of the first lifting device of a pallet loading and unloading system according to one embodiment of the present disclosure.
[0038] The specific labels in the attached figures are as follows:
[0039] 100 Conveying Device
[0040] 110 First Support Plate
[0041] 120 Second Support Plate
[0042] 130 First Conveying Component
[0043] 140 Second Conveyor Component
[0044] 150 First feeding baffle
[0045] 160 First feeding baffle
[0046] 170 Second feeding baffle
[0047] 180 Second feeding baffle
[0048] 200 First lifting device
[0049] 210 Support component
[0050] 220 Lifting Drive Device
[0051] 230 lifting plate
[0052] 310 First Disk Component
[0053] 311 Panel Support Frame
[0054] 312 Disk Drive Unit
[0055] 313 Disk Bracket
[0056] 320 Second Disk Component
[0057] 400 Second Lifting Device
[0058] 510 First Stacked Disc Assembly
[0059] 511 Stacking tray support frame
[0060] 511A Limiting Surface
[0061] 512 Stacking tray
[0062] 512A Inclined Surface
[0063] 520 Second Stacked Disc Component
[0064] 600 blocking device
[0065] 700 Third lifting device. Detailed Implementation
[0066] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the disclosure. Furthermore, it should be noted that, for ease of description, only the parts relevant to the present disclosure are shown in the accompanying drawings.
[0067] It should be noted that, where there is no conflict, the embodiments and features described in this disclosure can be combined with each other. The technical solutions of this disclosure will now be described in detail with reference to the accompanying drawings and embodiments.
[0068] Unless otherwise stated, the exemplary implementations / embodiments shown are to be understood as providing exemplary features of various details that provide ways in which the technical concepts of this disclosure can be implemented in practice. Therefore, unless otherwise stated, the features of various implementations / embodiments may be additionally combined, separated, interchanged and / or rearranged without departing from the technical concepts of this disclosure.
[0069] The use of crosshairs and / or shading in the accompanying drawings is generally used to clarify the boundaries between adjacent components. Thus, unless otherwise stated, the presence or absence of crosshairs or shading does not convey or indicate any preference or requirement for the specific material, material properties, dimensions, proportions, commonalities between the illustrated components, or any other characteristics, properties, etc., of the components. Furthermore, in the accompanying drawings, the dimensions and relative dimensions of components may be exaggerated for clarity and / or descriptive purposes. When exemplary embodiments can be implemented differently, a specific process sequence may be performed in a different order than that described. For example, two consecutively described processes may be performed substantially simultaneously or in the reverse order of their description. Furthermore, the same reference numerals denote the same components.
[0070] When a component is referred to as being "on" or "above" another component, "connected to," or "joined to" another component, the component may be directly on, directly connected to, or directly joined to the other component, or there may be intermediate components. However, when a component is referred to as being "directly on" another component, "directly connected to," or "directly joined to" another component, there are no intermediate components. Therefore, the term "connection" can refer to a physical connection, an electrical connection, etc., and may or may not have intermediate components.
[0071] For descriptive purposes, this disclosure may use spatial relative terms such as “below,” “under,” “below,” “down,” “above,” “above,” “higher,” and “side (e.g., in a “sidewall”)” to describe the relationship between one component and another component as shown in the accompanying drawings. In addition to the orientations depicted in the drawings, the spatial relative terms are also intended to encompass different orientations of the device during use, operation, and / or manufacture. For example, if the device in the drawings is flipped, a component described as “below” or “under” another component or feature would subsequently be positioned “above” said other component or feature. Thus, the exemplary term “below” can encompass both “above” and “below” orientations. Furthermore, the device may be otherwise positioned (e.g., rotated 90 degrees or in other orientations), thus interpreting the spatial relative descriptive terms used herein accordingly.
[0072] The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting. As used herein, unless the context clearly indicates otherwise, the singular forms “a” and “the” are intended to include the plural forms as well. Furthermore, when the terms “comprising” and / or “including” and variations thereof are used in this specification, it indicates the presence of the stated features, integrals, steps, operations, parts, components, and / or groups thereof, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, parts, components, and / or groups thereof. It should also be noted that, as used herein, the terms “substantially,” “about,” and other similar terms are used as approximate terms rather than as terms of degree, thus explaining the inherent biases in measurements, calculated values, and / or provided values that would be recognized by one of ordinary skill in the art.
[0073] Figure 1 This is a schematic diagram of the usage state of a pallet loading and unloading system according to one embodiment of the present disclosure. Figure 2 This is a schematic diagram of a pallet loading and unloading system according to one embodiment of the present disclosure.
[0074] like Figures 1 to 2 As shown, the pallet loading and unloading system disclosed herein includes components such as a conveying device 100, a first lifting device 200, a pallet separating device, a second lifting device 400, and a pallet stacking device.
[0075] The conveying device 100 is used to transport pallets. For example... Figure 1 and Figure 2As shown, the pallet of this disclosure can be conveyed from left to right. Specifically, the conveying device 100 includes a loading station, a handling station, and a unloading station, which are sequentially arranged along the conveying direction of the conveying device 100; in other words, in order to... Figure 1 and Figure 2 As shown, the loading station, transport station, and unloading station are set up from left to right.
[0076] See again Figure 1 and Figure 2 The conveying device 100 disclosed herein may include components such as a first support plate 110, a second support plate 120, a first conveying assembly 130, and a second conveying assembly 140.
[0077] The second support plate 120 is spaced apart from the first support plate 110; in a preferred embodiment, both the first support plate 110 and the second support plate 120 are vertically arranged and parallel to each other.
[0078] The first conveying component 130 is disposed on the first support plate 110; the second conveying component 140 is disposed on the second support plate 120, wherein the first conveying component 130 and the second conveying component 140 are both located between the first support plate 110 and the second support plate 120, thereby enabling the pallet to be conveyed by the first conveying component 130 and the second conveying component 140.
[0079] In one specific embodiment, the first conveying component 130 and the second conveying component 140 are belt conveying components, and the first conveying component 130 and the second conveying component 140 are driven by the same conveying drive device.
[0080] Specifically, the first conveying assembly 130 and the second conveying assembly 140 of this disclosure have the same structure. For example, the first conveying assembly 130 includes a first driving pulley, a first driven pulley, and a first synchronous belt that drives the first driving pulley and the first driven pulley; similarly, the second conveying assembly 140 includes a second driving pulley, a second driven pulley, and a second synchronous belt that drives the second driving pulley and the second driven pulley; moreover, the first driving pulley and the second driving pulley are fixed on the same rotating shaft, thereby enabling the drive device to synchronously drive the first driving pulley and the second driving pulley to rotate, and causing the pallet to be conveyed by the first synchronous belt and the second synchronous belt.
[0081] like Figure 1 and Figure 2As shown, the first lifting device 200 is located at the loading station to drive the stacked pallets to rise or fall; the pallet separating device is located on the conveying device 100 and is used to separate the pallets conveyed by the first lifting device 200, wherein the separated pallets are conveyed by the conveying device 100. In other words, the pallet separating device of this disclosure is also located at the loading station, and the pallet separating device can cooperate with the first lifting device 200 to realize the pallet separating operation of stacked pallets.
[0082] Figure 3 This is a schematic diagram of the structure of the first tray assembly 310 of a pallet loading and unloading system according to one embodiment of the present disclosure.
[0083] The tray dividing device includes a first tray dividing assembly 310 and a second tray dividing assembly 320. The first tray dividing assembly 310 and the second tray dividing assembly 320 have the same structure and are arranged symmetrically. The first tray dividing assembly 310 is disposed on the first support plate 110, and the second tray dividing assembly 320 is disposed on the second support plate 120.
[0084] The structure of the disc dividing device will be described below using the first disc dividing assembly 310 as an example.
[0085] Specifically, such as Figure 1 and Figure 3 As shown, the first disc assembly 310 includes: a disc support frame 311, a disc drive device 312, and a disc bracket 313; wherein, the disc support frame 311 is disposed on the first support plate 110; the disc drive device 312 is disposed on the disc support frame 311; in a specific embodiment, the disc drive device 312 can be a cylinder, preferably a slide cylinder.
[0086] The tray distribution drive device 312 is used to drive the tray distribution bracket 313 to move, so that the tray distribution bracket 313 can approach or move away from the tray. Specifically, the direction of movement of the tray distribution bracket 313 in this disclosure is horizontal, that is, the tray distribution bracket 313 can approach or move away from the tray in a horizontal direction.
[0087] When the pallet loading and unloading system of this disclosure is used, stacked pallets can be placed onto the pallet separating device by equipment such as AGVs and supported by the pallet separating device. When pallet separating is required, the first lifting device 200 rises and supports the stacked pallets. At this time, the pallet separating bracket 313 of the first pallet separating assembly 310 and the pallet separating bracket of the second pallet separating assembly 320 will move away from the pallets and move to a position that does not affect the downward movement of the pallets.
[0088] Next, the first lifting device 200 is controlled to move downwards by approximately the height of one pallet, so that the pallet brackets 313 of the first pallet-dividing assembly 310 and the second pallet-dividing assembly 320 approach the pallet, keeping the pallet adjacent to the bottommost pallet. Then, the first lifting device 200 continues to descend, and a pallet will descend synchronously with the first lifting device 200 and land on the first conveying assembly 130 and the second conveying assembly 140, where it will be conveyed by the first conveying assembly 130 and the second conveying assembly 140.
[0089] As the first conveying assembly 130 and the second conveying assembly 140 move, the pallet will be conveyed to the handling position. In a preferred embodiment, the pallet loading and unloading system further includes a blocking device 600 for blocking the pallet conveyed by the conveying device 100, wherein the blocking device 600 is located downstream of the third lifting device 700 along the direction in which the pallet is conveyed by the conveying device 100.
[0090] In other words, the blocking device 600 of this disclosure can block the pallet at the transport station. In a preferred embodiment, the blocking device 600 may include a blocking cylinder and a blocking plate. The blocking cylinder can drive the blocking plate to rise and fall, and when the blocking plate is in the raised position, it can block the pallet at the transport station; when the blocking plate is in the lowered position, the pallet can be transported to the unloading station by the first conveying component 130 and the second conveying component 140.
[0091] More preferably, the pallet loading and unloading system also includes a third lifting device 700, located at the handling station, for driving the pallet to rise. Thus, at the raised position, a handling device such as a robotic arm can move the pallet to a designated location near the production line. Additionally, empty pallets after loading can also be transported to the handling station via a handling device such as a robotic arm. These empty pallets will then be transported to the unloading station, where they will be stacked and collected.
[0092] See again Figure 1 and Figure 2 The second lifting device 400 of this disclosure is located at the unloading station to drive the pallet to rise; the pallet stacking device is provided on the conveying device 100 and is used to stack the pallets conveyed by the second lifting device 400.
[0093] Figure 4 This is a schematic diagram of the structure of the first pallet stacking assembly 510 of a pallet loading and unloading system according to one embodiment of the present disclosure.
[0094] like Figure 2 and Figure 4As shown, the stacking device of this disclosure includes a first stacking assembly 510 and a second stacking assembly 520. The first stacking assembly 510 and the second stacking assembly 520 have the same structure and are symmetrically arranged. The first stacking assembly 510 is disposed on the first support plate 110, and the second stacking assembly 520 is disposed on the second support plate 120.
[0095] Specifically, such as Figure 4 As shown, the first tray stacking assembly 510 includes a tray stacking support frame 511 and a tray stacking bracket 512; the tray stacking support frame 511 is disposed on the first support plate 110; the tray stacking bracket 512 is rotatably disposed on the tray stacking support frame 511, wherein the tray stacking bracket 512 is restricted to a first position by the tray stacking support frame 511 so that the tray stacking bracket 512 will not cross the first position when rotating.
[0096] The tray support frame 511 includes a limiting surface 511A for limiting the tray holder 512 to a first position, wherein when the tray holder 512 is in the first position, the upper surface of the tray holder 512 is set approximately horizontally.
[0097] In one specific embodiment, the limiting surface 511A can be a side surface of the tray support 511, which is generally vertically arranged. The upper surface of the tray holder 512 is also formed as a plane. When the tray holder 512 is in the first position, the upper surface of the tray holder 512 is generally horizontally arranged. At this time, the tray holder 512 is restricted to the first position through the contact between the upper surface of the tray holder 512 and the side surface of the tray support 511.
[0098] The tray holder 512 disclosed herein includes an inclined surface 512A, the angle between the inclined surface 512A and the upper surface of the tray holder 512 being an acute angle, such that the free end of the tray holder 512 forms a corner with an acute angle value.
[0099] When the tray holder 512 is in the second position, the inclined surface 512A is rotated to a substantially vertical position. In a preferred embodiment, the center of gravity of the tray holder 512 is set such that the weight of the tray holder 512 causes the tray holder 512 to have a tendency to move from the second position to the first position.
[0100] Figure 5 This is a schematic diagram of the structure of the first lifting device of a pallet loading and unloading system according to one embodiment of the present disclosure.
[0101] The first lifting device 200, the second lifting device 400, and the third lifting device 700 disclosed herein all have the same structure. The following description uses the first lifting device 200 as an example.
[0102] like Figure 5 As shown, the first lifting device 200 of this disclosure may include a support member 210, a lifting drive device 220, and a lifting plate 230. Specifically, the lifting drive device 220 may be mounted on the support member 210, and the lifting drive device 220 may be a double-rod cylinder or a slide cylinder. The lifting plate 230 is fixed to the lifting drive device 220 and is driven by the lifting drive device to produce a lifting action.
[0103] In the pallet loading and unloading system of this disclosure, when pallets are stacked, the third lifting device 700 is in a descending state. After the pallet is transported to the unloading station, the third lifting device 700 lifts the pallet, and the edge of the pallet will contact the stacking tray 512 and drive the stacking tray 512 to rotate. When the pallet rises to a preset height, the stacking tray 512 separates from the pallet. At this time, the stacking tray 512 will return to the first position, and then the third lifting device 700 descends. The stacked pallets are supported by the stacking tray 512 again, thereby completing the stacking of empty pallets.
[0104] In one embodiment, the first support plate 110 is provided with a first loading baffle 150 and a first unloading baffle 160. Similarly, the second support plate 120 is provided with a second loading baffle 170 and a second unloading baffle 180. The first loading baffle 150 and the second loading baffle 170 can position the stacked pallets at the loading station; the first unloading baffle 160 and the second unloading baffle 180 can position the stacked pallets at the unloading station.
[0105] The pallet loading and unloading system disclosed herein can realize a semi-closed-loop workflow of automatic material distribution, automatic precise positioning and retrieval, and automatic stacking and receiving in warehousing. The stacking design allows multiple pallets to be stacked vertically together, thereby significantly increasing storage capacity, reducing floor space, and improving storage efficiency.
[0106] In the description of this specification, the references to terms such as "one embodiment / mode," "some embodiments / modes," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment / mode or example is included in at least one embodiment / mode or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment / mode or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments / modes or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments / modes or examples described in this specification, as well as the features of different embodiments / modes or examples.
[0107] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0108] Those skilled in the art should understand that the above embodiments are merely for illustrating the present disclosure and are not intended to limit the scope of the disclosure. Those skilled in the art can make other changes or modifications based on the above disclosure, and these changes or modifications still fall within the scope of the present disclosure.
Claims
1. A pallet loading and unloading system, characterized in that, include: A conveying device, comprising a loading station, a handling station, and a unloading station, wherein the loading station, the handling station, and the unloading station are arranged sequentially along the conveying direction of the conveying device; A first lifting device is located at the loading station to drive the stacked pallets to rise or fall. The tray separating device is disposed on the conveying device and is used to separate stacked pallets, wherein the separated pallets are conveyed by the conveying device. A second lifting device, located at the unloading station, is used to drive the pallet upwards; and A pallet stacking device is provided on the conveying device and is used to stack pallets at the unloading station.
2. The pallet loading and unloading system according to claim 1, characterized in that, The conveying device includes: First support plate, A second support plate is provided at a distance from the first support plate; A first conveying assembly, wherein the first conveying assembly is disposed on the first support plate; and The second conveying component is disposed on the second support plate, wherein both the first conveying component and the second conveying component are located between the first support plate and the second support plate.
3. The pallet loading and unloading system according to claim 2, characterized in that, The first conveying component and the second conveying component are belt conveying components, and the first conveying component and the second conveying component are driven by the same conveying drive device.
4. The pallet loading and unloading system according to claim 2, characterized in that, The disc divider includes a first disc divider assembly and a second disc divider assembly, which have the same structure and are symmetrically arranged; wherein the first disc divider assembly is disposed on the first support plate and the second disc divider assembly is disposed on the second support plate.
5. The pallet loading and unloading system according to claim 4, characterized in that, The first partition assembly includes: The tray support frame is disposed on the first support plate; The disk drive device is disposed on the disk support frame; The tray divider is driven by a tray divider drive device to move the tray divider so that the tray divider can approach or move away from the tray.
6. The pallet loading and unloading system according to claim 2, characterized in that, The stacking device includes a first stacking assembly and a second stacking assembly, which have the same structure and are symmetrically arranged; wherein the first stacking assembly is disposed on the first support plate and the second stacking assembly is disposed on the second support plate.
7. The pallet loading and unloading system according to claim 6, characterized in that, The first stacking disk assembly includes: A stacking tray support frame, wherein the stacking tray support frame is disposed on the first support plate; A tray holder is rotatably mounted on a tray support frame, wherein the tray holder is constrained by the tray support frame to a first position so that the tray holder will not exceed the first position when rotating.
8. The pallet loading and unloading system according to claim 7, characterized in that, The tray support frame includes a limiting surface for restricting the tray support frame to a first position, wherein when the tray support frame is in the first position, the upper surface of the tray support frame is set approximately horizontally.
9. The pallet loading and unloading system according to claim 1, characterized in that, Also includes: The third lifting device is located at the handling station and is used to drive the pallet to rise.
10. The pallet loading and unloading system according to claim 9, characterized in that, Also includes: A blocking device is provided to block the pallets being transported by the conveying device, wherein the blocking device is located downstream of the third lifting device along the direction in which the pallets are transported by the conveying device.