A lifting and conveying device and a return flow device

Abstract

This application relates to the field of PCB board processing equipment technology, and specifically discloses a lifting and conveying device and a return device, including a frame, a first conveying component, a lead screw, and a driving component. The first conveying component is movably connected to the frame; the lead screw is rotatably connected to the frame, and the lead screw is threadedly connected to the first conveying component; the driving component is connected to the lead screw, and the driving component can drive the lead screw to rotate relative to the frame around a first direction, thereby driving the first conveying component to move relative to the frame along the first direction. Through the above method, this application embodiment can utilize the lead screw structure to drive the first conveying component to move along the first direction. The lead screw structure can control the moving distance of the first conveying component in the first direction with high precision. The lead screw structure has high stability during load-bearing. The first conveying component can also convey tooling to a designated position. The entire lifting and conveying device has a simple structure, reasonable layout, and convenient maintenance.

Description

Technical Field

[0001] This application relates to the field of PCB board processing equipment technology, and in particular to a lifting conveyor and a return device. Background Technology

[0002] A PCB (Printed Circuit Board) is an important electronic component, serving as the support for electronic components and the carrier for their electrical connections. Before use, electronic components need to be inserted into the PCB, followed by wave soldering. After wave soldering, the PCB is unloaded. The unloading process typically involves a lifting conveyor to transport the fixtures to a designated location for reflow.

[0003] In the process of realizing this application, the inventors discovered that the lifting and conveying devices in the related technologies have a complex structure and are difficult to maintain. Utility Model Content

[0004] In view of the above problems, the present application provides a lifting and conveying device and a return device, which overcome the above problems or at least partially solve the above problems.

[0005] According to one aspect of this application, a lifting and conveying device is provided, including a frame; a first conveying assembly movably connected to the frame; a lead screw rotatably connected to the frame and threadedly connected to the first conveying assembly; and a drive member connected to the lead screw, the drive member being capable of driving the lead screw to rotate relative to the frame about a first direction, thereby causing the first conveying assembly to move relative to the frame along the first direction.

[0006] In one optional embodiment, the first conveying assembly includes a support, a first conveying wheel, a second conveying wheel, and a conveying strip. The support is threadedly connected to the lead screw. The first and second conveying wheels are rotatably mounted on the support. The first and second conveying wheels are spaced apart along a second direction. The conveying strip is respectively sleeved on the first and second conveying wheels. The first and second conveying wheels are each rotatable about a third direction to drive the conveying strip along the second direction. The first direction, the second direction, and the third direction are perpendicular to each other.

[0007] In one alternative embodiment, the first conveying assembly further includes a conveying drive and a drive shaft. The conveying drive is mounted on the bracket and connected to the drive shaft. The drive shaft is connected to the first conveying wheel, and the conveying drive can drive the drive shaft to rotate, thereby causing the first conveying wheel to rotate.

[0008] In one alternative embodiment, the frame includes a support base plate and a guide rod, one end of which is connected to the support base plate and passes through the bracket, which is movable along the guide rod in the first direction.

[0009] In one alternative embodiment, the lifting and conveying device further includes a transmission assembly that connects the lead screw and the drive component.

[0010] In one alternative embodiment, the transmission assembly includes a driving wheel, a first driven wheel, and a first transmission belt. The driving wheel is connected to the driving member, the first transmission belt connects the driving wheel and the first driven wheel, and the first driven wheel is drivenly connected to the lead screw.

[0011] In one alternative embodiment, the transmission assembly further includes a connecting shaft, a second driven wheel, a third driven wheel, and a second transmission belt. The connecting shaft connects the first driven wheel and the second driven wheel for transmission, the second transmission belt connects the second driven wheel and the third driven wheel, and the third driven wheel is connected to the lead screw.

[0012] According to another aspect of this application, a reflux device is provided, the reflux device comprising an inlet conveyor; a reflux conveyor spaced apart from the inlet conveyor along a first direction; and a lifting conveyor as described above, wherein a first conveying component of the lifting conveyor is movable along the first direction to dock with the inlet conveyor or with the reflux conveyor.

[0013] In one alternative embodiment, the reflux device further includes a second reflux unit disposed on one side of the inlet conveyor, the second reflux unit being used to receive material from the inlet conveyor.

[0014] In one alternative embodiment, the return device further includes a clamping device spaced apart from the lifting conveyor, the clamping device being used to transfer material from the inlet conveyor to the second return device and / or the lifting conveyor.

[0015] The beneficial effects of this application embodiment are as follows: Unlike the prior art, this application embodiment includes a frame, a first conveying assembly, a lead screw, and a driving component. The first conveying assembly is movably connected to the frame, the lead screw is rotatably connected to the frame, and the lead screw is threadedly connected to the first conveying assembly. The driving component is connected to the lead screw, and the driving component can drive the lead screw to rotate relative to the frame around a first direction, thereby moving the first conveying assembly relative to the frame along the first direction. In this application embodiment, the lead screw structure drives the first conveying assembly to move along the first direction. The lead screw structure can control the movement distance of the first conveying assembly in the first direction with high precision, and the lead screw structure has high stability during load-bearing. The first conveying assembly can also convey tooling to a designated position. The entire lifting and conveying device has a simple structure, reasonable layout, and convenient maintenance. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0017] Figure 1 This is a schematic diagram of the overall structure of the lifting and conveying assembly according to an embodiment of this application;

[0018] Figure 2 This is a schematic diagram of the overall structure of the reflux device according to an embodiment of this application from an angle;

[0019] Figure 3 This is a partial structural diagram of the recirculation device according to an embodiment of this application;

[0020] Figure 4 This is a schematic diagram of the overall structure of the inlet conveying device of the reflux equipment in this application embodiment;

[0021] Figure 5 This is a schematic diagram of the overall structure of the second conveying device of the reflux equipment in this application embodiment;

[0022] Figure 6 This is a schematic diagram of the overall structure of the clamping device of the reflux equipment in this application embodiment. Detailed Implementation

[0023] To facilitate understanding of this application, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected" to another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this specification are for illustrative purposes only.

[0024] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0025] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0026] Please see Figure 1 The lifting and conveying assembly 100 includes a frame 10, a first conveying assembly 20, a lead screw 30, and a drive component 40. The first conveying assembly 20 is movably connected to the frame 10, the lead screw 30 is rotatably connected to the frame 10 and threadedly connected to the first conveying assembly 20, and the drive component 40 is connected to the lead screw 30 and can drive the lead screw 30 to rotate.

[0027] To better illustrate the structure of the lifting and conveying assembly 100, it will be described in conjunction with the first direction Z, the second direction X, and the third direction Y, wherein the first direction Z is perpendicular to the second direction X and the third direction Y.

[0028] For the aforementioned rack 10, such as Figure 1 As shown, the frame 10 includes a top support plate 11, a bottom support plate 12, and a guide rod 13. The top support plate 11 and the bottom support plate 12 are spaced apart along a first direction Z. One end of the guide rod 13 is connected to the bottom support plate 12, and the other end of the guide rod 13 is connected to the top support plate 11. The guide rod 13 is located between the top support plate 11 and the bottom support plate 12. In some embodiments, one end of the lead screw 30 is rotatably connected to the top support plate 11, and the other end of the lead screw 30 is rotatably connected to the bottom support plate 12. The lead screw 30 is located between the top support plate 11 and the bottom support plate 12.

[0029] In some embodiments, the frame 10 is further provided with a first support bearing 14 and a second support bearing 15. The first support bearing 14 is disposed on the top support plate 11, and the second support bearing 15 is disposed on the bottom support plate 12. The first support bearing 14 is rotatably connected to one end of the lead screw 30, and the second support bearing 15 is rotatably connected to the other end of the lead screw 30. The first support bearing 14 and the second support bearing 15 enable the lead screw 30 to rotate relative to the frame 10, so that the lead screw 30 rotates smoothly and efficiently relative to the frame 10.

[0030] Regarding the aforementioned first conveying assembly 20, lead screw 30, and drive component 40, as follows: Figure 1 As shown, the first conveying assembly 20 is movably connected to the frame 10, and the lead screw 30 is rotatably connected to the frame 10. The lead screw 30 is threadedly connected to the first conveying assembly 20, and the driving member 40 is connected to the lead screw 30. The driving member 40 can drive the lead screw 30 to rotate relative to the frame 10 around the first direction Z, so as to drive the first conveying assembly 20 to move relative to the frame 10 along the first direction Z. By using the structure of the lead screw 30 to drive the first conveying assembly 20 to move along the first direction Z, the structure of the lead screw 30 can control the moving distance of the first conveying assembly 20 in the first direction Z with high precision, and the structure of the lead screw 30 has high stability during the load-bearing process.

[0031] Specifically, the first conveying assembly 20 includes a bracket 21, a first conveying wheel 22, a second conveying wheel 23, and a conveying bar 24. The bracket 21 is threadedly connected to a lead screw 30. The first and second conveying wheels 22 and 23 are rotatably mounted on the bracket 21 and are spaced apart along a second direction X. The conveying bar 24 is respectively sleeved on the first and second conveying wheels 22 and 23. The first and second conveying wheels 22 and 23 can rotate around a third direction Y to drive the conveying bar 24 to move along the second direction X. Driven by the first and second conveying wheels 22 and 23, the conveying bar 24 can convey the tooling along the second direction X. Since the bracket 21 is threadedly connected to the lead screw 30, the rotation of the lead screw 30 can drive the bracket 21 to move along a first direction Z. In some embodiments, the bracket 21 is inserted through the guide rod 13, and the bracket 21 can move along the guide rod 13 in the first direction Z. The guide rod 13 can guide the movement of the bracket 21 in the first direction Z, reducing the possibility of the bracket 21 deviating or swaying during movement.

[0032] In some embodiments, the first conveying assembly 20 further includes a conveying drive 25 and a drive shaft 26. The conveying drive 25 is mounted on the bracket 21 and connected to the drive shaft 26. The drive shaft 26 is connected to the first conveying wheel 22. The conveying drive 25 can drive the drive shaft 26 to rotate, thereby causing the first conveying wheel 22 to rotate. After the conveying drive 25 drives the drive shaft 26 to rotate, the drive shaft 26 drives the first conveying wheel 22 to rotate, and the first conveying wheel 22 thereby drives the conveyor strip 24 to convey the tooling along the second direction X. In some embodiments, the conveying drive 25 is a drive motor.

[0033] It should be noted that the first conveyor wheel 22, the second conveyor wheel 23 and the conveyor bar 24 constitute a conveyor sprocket assembly. There can be multiple conveyor sprocket assemblies. Multiple conveyor sprocket assemblies are arranged along the third direction Y. The arrangement of multiple conveyor sprocket assemblies can make the conveying of the tooling more stable and prevent the tooling from falling off.

[0034] In some embodiments, there are two conveyor sprocket assemblies. The bracket 21 is also provided with a first mounting plate 211 and a second mounting plate 212. The first mounting plate 211 and the second mounting plate are spaced apart along the third direction Y. One conveyor sprocket assembly is disposed on the first mounting plate 211 and the other conveyor sprocket assembly is disposed on the second mounting plate 212.

[0035] In some embodiments, the lifting and conveying device 100 further includes a transmission assembly 50, which is disposed on the frame 10. The transmission assembly 50 is connected to the lead screw 30 and the drive member 40 respectively. The transmission assembly 50 can transmit the power output by the drive member 40 to the lead screw 30. The transmission assembly 50 can also play a role in speed change to control the rotation speed of the lead screw 30.

[0036] In some embodiments, the transmission assembly 50 includes a driving pulley 51, a first driven pulley 52, and a first transmission belt 53. The driving pulley 51 is connected to the driving member 40, and the first transmission belt 53 connects the driving pulley 51 and the first driven pulley 52. ​​The first driven pulley 52 is driven by a lead screw 30. The driving member 40 drives the driving pulley 51 to rotate, and the rotating driving pulley 51 drives the first transmission belt 53 and the first driven pulley 52 to rotate. Then, the first driven pulley 52 drives the lead screw 30 to rotate. Belt drives have a certain degree of elasticity, which can absorb and buffer vibrations and impacts during movement. In some embodiments, the diameter of the driving pulley 51 is larger than the diameter of the first driven pulley 52. ​​In this case, the transmission system achieves deceleration. It is understood that the size comparison between the diameters of the driving pulley 51 and the first driven pulley 52 can be set by the user according to actual needs, and is not specifically limited in this application.

[0037] In some embodiments, the transmission assembly 50 further includes a second driven wheel 54, a third driven wheel 55, a second transmission belt 56, and a connecting shaft 57. The connecting shaft 57 connects the first driven wheel 52 and the second driven wheel 54, respectively. The second transmission belt 56 connects the second driven wheel 54 and the third driven wheel 55, respectively. The third driven wheel 55 is connected to the lead screw 30. Based on the above embodiment, the rotating first driven wheel 52 drives the second driven wheel 54 to rotate via the connecting shaft 57. The rotating second driven wheel 54 drives the second transmission belt 56 and the third driven wheel 55 to rotate. Then, the third driven wheel 55 drives the lead screw 30 to rotate. The entire transmission system forms a multi-stage transmission structure. This configuration allows for more complex transmission ratio adjustments. Each stage of transmission can be selected with different wheel diameter ratios as needed, thereby achieving a wider range of deceleration or acceleration.

[0038] In this embodiment, a frame 10, a first conveying assembly 20, a lead screw 30, and a drive unit 40 are provided. The first conveying assembly 20 is movably connected to the frame 10, and the lead screw 30 is rotatably connected to the frame 10. The lead screw 30 is threadedly connected to the first conveying assembly 20. The drive unit 40 is connected to the lead screw 30 and can drive the lead screw 30 to rotate relative to the frame 10 around a first direction Z, thereby moving the first conveying assembly 20 relative to the frame 10 along the first direction Z. In this embodiment, the lead screw 30 structure drives the first conveying assembly 20 to move along the first direction Z. The lead screw 30 structure can control the movement distance of the first conveying assembly 20 in the first direction Z with high precision, and the lead screw 30 structure has high stability during load-bearing. The first conveying assembly 20 can also convey tooling to a designated position. The entire lifting and conveying device 100 has a simple structure, reasonable layout, convenient maintenance, low maintenance cost, and is more convenient.

[0039] Please see Figure 2 and Figure 3 This application also provides an embodiment of a return device 1000, which includes an inlet conveyor 200, a return conveyor 300, and a lifting conveyor 100 as described above. The return conveyor 300 is spaced apart from the inlet conveyor 200 along a first direction Z, and the first conveying component 20 of the lifting conveyor 100 can move along the first direction Z to dock with the inlet conveyor 200 or with the return conveyor 300.

[0040] In some embodiments, please refer to the following: Figure 4The conveying device 200 includes a first support plate 2001, a second support plate 2002, a third sprocket assembly 2003, a fourth sprocket assembly 2004, a clamping cylinder 2005, and a clamping plate 2006. The first support plate 2001 and the second support plate 2002 are spaced apart along a third direction (Y). The third sprocket assembly 2003 is disposed on the first support plate 2001, and the fourth sprocket assembly 2004 is disposed on the second support plate 2002. The clamping cylinder 2005 is disposed on the second support plate 2002, and the clamping plate 2006 is connected to the clamping cylinder 2005. The clamping cylinder 2005 can drive the clamping plate 2006 to move along the third direction (Y). The third sprocket assembly 2003 and the fourth sprocket assembly 2004 can be used to convey workpieces along a second direction (X). Driven by the clamping cylinder 2005, the clamping plate 2006 can clamp the workpiece in the third direction Y to reduce the workpiece falling off the sprocket assembly.

[0041] It should be noted that the specific structures of the third sprocket assembly 2003 and the fourth sprocket assembly 2004 can be found in the description of the specific structure of the conveyor sprocket assembly described above, and the structure of the return conveyor device 300 can be found in the description of the structure of the first conveyor assembly 20 described above. These details will not be repeated here. It is understood that the conveying direction of the return conveyor device 300 can be the same as or different from the conveying direction of the first conveyor assembly 20, and the user can set it according to actual needs.

[0042] In some embodiments, the recirculation device further includes a housing 400, and the inlet conveyor 200, the recirculation conveyor 300, and the lifting conveyor 100 are all disposed within the receiving cavity 400a of the housing 400. In some embodiments, the housing 400 is provided with an inlet 400b, a first recirculation port 400c, a second recirculation port 400d, and an outlet 400e communicating with the receiving cavity 400a. The inlet 400b and the first recirculation port 400c are spaced apart along a first direction Z, and the inlet 400b and the second recirculation port 400d are also spaced apart along the first direction Z. Along the first direction Z, the inlet 400b is located between the first recirculation port 400c and the second recirculation port 400d. The inlet conveyor 200 is located at the inlet 400b, and the recirculation conveyor 300 is located at the first recirculation port 400c. The inlet 400b facilitates the inlet of the workpiece into the receiving cavity 400a, and the outlet 400e facilitates the outlet of the workpiece from the receiving cavity 400a and into the next process.

[0043] In some embodiments, please refer to the following: Figure 5The reflow equipment also includes a second conveying device 500, which is disposed within the receiving cavity 400a and spaced apart from the lifting conveying device 100 along the second direction X. The second conveying device 500 is located at the output port 400e and can be used to convey the PCB board to the next process. In some embodiments, the second conveying device 500 includes a support base 5001 and a conveyor belt 5002. The conveyor belt 5002 is mounted on the support base 5001 and is rotatable relative to the support base 5001. The conveyor belt 5002 can convey workpieces along the second direction X.

[0044] In some embodiments, the reflow device further includes a second reflow device 600, which is disposed on one side of the inlet conveyor 200. The second reflow device 600 is used to receive materials from the inlet conveyor 200. For example, the second reflow device 600 can reflow the cover plate fixture of the PCB board soldering jig. The structure of the second reflow device 600 can be referred to the structure of the second conveyor 500 described above, and will not be repeated here. It is understood that the conveying principle of the second reflow device 600 includes, but is not limited to, belt conveying, chain conveying, etc., and the conveying direction of the second reflow device 600 may be the same as or different from the conveying direction of the second conveyor 500. Users can set it according to actual needs.

[0045] In some embodiments, please refer to the following: Figure 6 The reflow equipment also includes a clamping device 700, which is spaced apart from the lifting conveyor 100. The clamping device is used to transfer the material on the inlet conveyor 200 to the second reflow device 600 and / or the lifting conveyor 100. For example, the clamping device 700 can remove the cover plate fixture of the PCB board soldering fixture, clamp the cover plate fixture and place it on the second reflow device 600, and reflow the cover plate fixture using the second reflow device 600. After the cover plate fixture is removed, the clamping device 700 can clamp the PCB board and place it on the second conveyor 500, and convey the PCB board to the next process using the second conveyor 500. The fixture base is clamped by the clamping device 700 and placed on the lifting conveyor 100. The first conveying component 20 on the lifting conveyor 100 moves along the first direction Z to dock with the reflow conveyor 300, and reflows the fixture base using the reflow conveyor 300.

[0046] It is understood that in some other embodiments, the gripping device 700 may also be used solely for transferring material from the inlet conveyor 200 to the second return device 600. In some other embodiments, the gripping device 700 may also be used solely for transferring material from the inlet conveyor 200 to the lifting conveyor 100.

[0047] In some embodiments, the gripping device 700 includes a mounting base 7001, a first connecting arm 7002, a second connecting arm 7003, a third connecting arm 7004, a fourth connecting arm 7005, a fifth connecting arm 7006, and a mechanical gripper 7007. The mounting base 7001 is fixed relative to the chassis 400. One end of the first connecting arm 7002 is rotatably connected to the mounting base 7001, and the other end of the first connecting arm 7002 is rotatably connected to one end of the second connecting arm 7003. The other end of the second connecting arm 7003 is rotatably connected to one end of the third connecting arm 7004, the other end of the third connecting arm 7004 is rotatably connected to one end of the fourth connecting arm 7005, the other end of the fourth connecting arm 7005 is rotatably connected to one end of the fifth connecting arm 7006, and the other end of the fifth connecting arm 7006 is connected to the mechanical gripper 7007.

[0048] In some embodiments, the mechanical gripper 7007 includes a connecting plate 7007a, a first gripper 7007b, and a second gripper 7007c. The connecting plate 7007a is connected to a fifth connecting arm 7006. The first gripper 7007b is disposed on one side of the connecting plate 7007a, and the second gripper 7007c is disposed on the other side of the connecting plate 7007a. The first gripper 7007b is rotatably connected to the connecting plate 7007a, and the second gripper 7007c is rotatably connected to the connecting plate 7007a. In some embodiments, the connecting plate 7007a is rotatably connected to the fifth connecting arm 7006.

[0049] In some embodiments, the first gripper 7007b includes two first gripping fingers that can move closer to or further away from each other, and the relative movement between the two first gripping fingers can accommodate workpieces of different sizes.

[0050] In some embodiments, the second gripper 7007c includes two second gripping fingers that can move closer to or further away from each other, and the relative movement between the two second gripping fingers can accommodate workpieces of different sizes.

[0051] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A lifting and conveying device, characterized in that, include: frame; A first conveying assembly is movably connected to the frame; A lead screw is rotatably connected to the frame, and the lead screw is threadedly connected to the first conveying assembly; A driving component is connected to the lead screw, which can drive the lead screw to rotate relative to the frame about a first direction, so as to drive the first conveying assembly to move relative to the frame along the first direction.

2. The lifting and conveying device according to claim 1, characterized in that, The first conveying assembly includes a bracket, a first conveying wheel, a second conveying wheel, and a conveying bar. The bracket is threadedly connected to the lead screw. The first and second conveying wheels are rotatably mounted on the bracket. The first and second conveying wheels are spaced apart along a second direction. The conveying bar is respectively sleeved on the first and second conveying wheels. The first conveying wheel and the second conveying wheel can rotate about a third direction to drive the conveying bar to move along the second direction; Wherein, the first direction, the second direction, and the third direction are perpendicular to each other.

3. The lifting and conveying device according to claim 2, characterized in that... , The first conveying assembly further includes a conveying drive and a transmission shaft. The conveying drive is mounted on the bracket and connected to the transmission shaft. The transmission shaft is connected to the first conveying wheel. The conveying drive can drive the transmission shaft to rotate, thereby causing the first conveying wheel to rotate.

4. The lifting and conveying device according to claim 2, characterized in that, The frame includes a support base plate and a guide rod. One end of the guide rod is connected to the support base plate, and the guide rod passes through the bracket. The bracket can move along the guide rod.

5. The lifting and conveying device according to any one of claims 1-4, characterized in that... , The lifting and conveying device also includes a transmission assembly, which is mounted on the frame and is connected to the lead screw and the drive component respectively.

6. The lifting and conveying device according to claim 5, characterized in that... , The transmission assembly includes a driving wheel, a first driven wheel, and a first transmission belt. The driving wheel is connected to the driving member, the first transmission belt connects the driving wheel and the first driven wheel, and the first driven wheel is drivenly connected to the lead screw.

7. The lifting and conveying device according to claim 6, characterized in that... , The transmission assembly further includes a connecting shaft, a second driven wheel, a third driven wheel, and a second transmission belt. The connecting shaft connects the first driven wheel and the second driven wheel, the second transmission belt connects the second driven wheel and the third driven wheel, and the third driven wheel is connected to the lead screw.

8. A reflux device, characterized in that, include: Import conveyor; A return conveying device is provided at intervals from the inlet conveying device along a first direction; The lifting conveying device as described in any one of claims 1-7, wherein the first conveying component of the lifting conveying device can be moved along the first direction to dock with the inlet conveying device or with the return conveying device.

9. The reflux device according to claim 8, characterized in that... , The reflux device further includes a second reflux device, which is disposed on one side of the inlet conveyor and is used to receive the material from the inlet conveyor.

10. The reflux device according to claim 9, characterized in that... , The return device also includes a clamping device, which is spaced apart from the lifting conveyor. The clamping device can be used to transfer the material on the inlet conveyor to the second return device and / or the lifting conveyor.

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