Rotary table and tray dispensing system

Abstract

The application discloses a rotary table and a tray distribution system, wherein the rotary table comprises a base and a rotating seat rotatably arranged on the base; a supporting shaft is fixedly arranged on the base; the rotating seat is rotatably arranged on the supporting shaft, and a bottom plate of the rotating seat is sleeved on an outer periphery of the supporting shaft and close to a lower end of the supporting shaft; a fixed gear is arranged on the supporting shaft; the fixed gear is engaged with a movable gear located outside the fixed gear; and the movable gear is driven to rotate by a motor located on the rotating seat. In the structure, the supporting shaft does not rotate, but the rotating seat rotates, and the rotating seat is arranged on the outer periphery of the supporting shaft, so that the pressure on the top of the supporting shaft is greatly reduced, thereby reducing the risk of deformation of the supporting shaft, and the rotary conveying mechanism can bear more weight of articles and has stronger application ability compared with the prior art.

Description

Technical Field

[0001] This invention relates to the field of polycrystalline silicon processing equipment, and in particular to rotary worktables and tray distribution systems. Background Technology

[0002] In the polycrystalline silicon processing, the polycrystalline silicon material is transported. During transport, a rotary table is often used. In the structure shown in application number 202122297837.5, a servo motor drives a reduction gear and an output gear to drive the connecting shaft to rotate, thereby driving the rotating frame on the connecting shaft to rotate.

[0003] However, in this structure, without other support, the weight of the rotating frame, the conveyor line, and the items on it all rests on the support shaft. This puts a lot of pressure on the support shaft, making it prone to damage. Therefore, the weight of goods that can be transported is limited when the rotating frame is unsupported. Summary of the Invention

[0004] The purpose of this invention is to solve the above-mentioned problems existing in the prior art and to provide a rotating worktable and tray distribution system.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A rotating worktable includes a base and a rotatable seat mounted on the base. A support shaft is fixedly mounted on the base. The rotatable seat is rotatably mounted on the support shaft. The bottom plate of the rotatable seat is fitted around the outer periphery of the support shaft and is close to the lower end of the support shaft. A fixed gear is mounted on the support shaft. The fixed gear meshes with a movable gear located on its outer side. The movable gear is driven to rotate by a motor located on the rotatable seat.

[0007] Preferably, in the rotating worktable, the base still has a set of omnidirectional balls for supporting the rotating seat.

[0008] Preferably, in the rotating worktable, an upper bearing and a planar thrust bearing or guide sleeve located below the upper bearing are coaxially mounted on the support shaft, and the connecting sleeve of the rotating seat is sleeved on the outer periphery of the upper bearing and the planar thrust bearing or guide sleeve.

[0009] Preferably, in the rotating worktable, the support shaft has a central hole, and the base has a through hole that is coaxial with and communicates with the central hole.

[0010] Preferably, in the rotating worktable, the motor is embedded in a clearance hole opened in the base plate of the rotating seat.

[0011] Preferably, in the rotating worktable, the rotating seat is provided with a conveying device.

[0012] Preferably, in the rotating worktable, the conveying device includes a set of chain conveyor mechanisms with gaps.

[0013] Preferably, in the rotating worktable, each of the chain conveyor mechanisms includes a first sprocket and a second sprocket located at both ends. The first sprockets of a group of chain conveyor mechanisms are collectively mounted on a first rotating shaft. The first rotating shaft is rotatably mounted on the frame and connected to a drive motor that drives its rotation. The second sprockets of each chain conveyor mechanism are rotatably mounted on a second rotating shaft.

[0014] Preferably, in the rotating worktable, the second rotating shaft is movably mounted on a frame on a rotating seat along the conveying direction of the chain conveyor mechanism, and the frame is provided with an adjustment mechanism for adjusting the position of the second rotating shaft.

[0015] Preferably, in the rotating worktable, the drive motor of the conveying device is mounted on the rotating base.

[0016] Preferably, in the rotating worktable, the rotating seat is provided with guide wheels located at both ends of the conveying device, and the top of the guide wheels is at approximately the same height as the conveying surface of the conveying device.

[0017] The pallet distribution system includes any of the aforementioned rotary tables.

[0018] The advantages of the technical solution of this invention are mainly reflected in:

[0019] In this design, the support shaft does not rotate; instead, the rotating seat rotates. The rotating seat is located on the outer periphery of the support shaft. This greatly reduces the pressure on the top of the support shaft, thereby reducing the risk of deformation. Therefore, without a support structure, this design can handle heavier items compared to existing rotary conveyor mechanisms, making it more versatile.

[0020] Using omnidirectional balls to support the swivel base ensures structural stability, and the omnidirectional balls are easier to install than rollers, while also not interfering with the rotation of the swivel base.

[0021] The connection structure between the rotating base and the support shaft can effectively improve the stability of the connection, while reducing the stress on the upper region of the support shaft.

[0022] Holes on the support shaft and base facilitate wiring and make the actual assembly of the equipment easier.

[0023] The motor is installed in the clearance hole on the base plate, which reduces the installation height of the motor and thus makes it easier to reduce the overall height of the machine.

[0024] Using multiple chain conveyor mechanisms can effectively reduce the weight of the equipment. At the same time, the tension of each chain conveyor mechanism can be adjusted independently, making it more convenient to use.

[0025] The pallet distribution system in this solution can effectively distribute the split pallets to different usage destinations, thereby effectively meeting the needs of dual processing lines. Attached Figure Description

[0026] Figure 1 This is a cross-sectional view of the present invention;

[0027] Figure 2 yes Figure 1 Enlarged view of region A in the middle;

[0028] Figure 3 This is a perspective view of the present invention (part of the adjustment mechanism and chain plate are omitted in the figure);

[0029] Figure 4 This is a top view of the tray dispensing system of the present invention;

[0030] Figure 5 This is a perspective view of the pallet splitting machine of the present invention;

[0031] Figure 6 This is a perspective view of the disassembly conveyor line of the pallet disassembly machine of the present invention;

[0032] Figure 7 This is a perspective view of the end mounting base of the disassembly conveyor line of the present invention;

[0033] Figure 8 This is a partial sectional view of the end mounting base of the disassembly conveyor line of the present invention mounted on the main crossbeam;

[0034] Figure 9 This is a perspective view of the top mechanism of the splitting conveyor line of the present invention;

[0035] Figure 10 yes Figure 5 A magnified view of region B in the middle. Detailed Implementation

[0036] The objectives, advantages, and features of this invention will be illustrated and explained through the following non-limiting description of preferred embodiments. These embodiments are merely typical examples of applying the technical solutions of this invention, and all technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by this invention.

[0037] In the description of the solution, it should be noted that the terms "center," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience and simplification of description, and 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 of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Also, in the description of the solution, with the operator as a reference, the direction closer to the operator is the proximal end, and the direction farther from the operator is the distal end.

[0038] Example 1

[0039] The rotary worktable disclosed in this invention will now be described in conjunction with the accompanying drawings, as shown below. Figure 1 As shown, it includes a base 1 and a rotating seat 2 rotatably mounted on the base 1. A support shaft 3 is fixedly mounted on the base 1, and the rotating seat 2 is rotatably mounted on the support shaft 3. A fixed gear 4 is mounted on the support shaft 3, and the fixed gear 4 meshes with a movable gear 5 located outside it. The movable gear 5 is driven to rotate by a motor 6 located on the rotating seat 2. During operation, the motor 6 drives the movable gear 5 to rotate, thereby causing the movable gear 5 to rotate around the fixed gear 4, which in turn drives the rotating seat 2 to rotate around the support shaft 3.

[0040] As attached Figure 1 As shown, the base 1 includes a platform 11 and a set of legs 12 provided at the bottom of the platform 11. Of course, the legs 12 can also be replaced by lockable casters or the like.

[0041] As attached Figure 2 As shown, the rotating base 2 includes a base plate 21 and a mounting bracket disposed on the base plate 21. A mounting hole 22 is formed in the center of the base plate 21. The base plate 21 is coaxially mounted on the support shaft 3 and close to the lower end of the support shaft 3. In order to provide stable support for the rotating base 2 and reduce the force on the support shaft 3, a set of universal balls (not shown in the figure) is provided on the top of the platform 11. The spheres of the universal balls are in contact with the base plate 21. The specific structure of the universal balls is known technology and will not be described in detail here.

[0042] As attached Figure 2As shown, for ease of installation, a connecting sleeve 23 is provided on the base plate 21. The connecting sleeve 23 is coaxially connected to the base plate 21 via a flange. The connecting sleeve 23 can be connected to the support shaft 3 via a bearing. More preferably, to ensure the stability of the connection between the connecting sleeve 23 and the support shaft 3, an upper bearing 7 and a planar thrust bearing or guide sleeve 8 located below the upper bearing 7 are coaxially fitted on the support shaft 3. The support shaft 3 is connected to the top center of the platform 11 via a flange 31. The support shaft 3 also includes a first section 32, a second section 33, and a third section 34 with their outer diameters increasing sequentially from top to bottom. The fixed gear 4 is fixed on the first section 32. The upper bearing 7 is fitted on the second section 33 and close to the first section 32. The planar thrust bearing or guide sleeve 8 is fitted on the second section 33 and abuts against the top surface of the third section 34. The connecting sleeve 23 is fitted around the upper bearing 7 and the planar thrust bearing or guide sleeve 8. The planar thrust bearing or guide sleeve 8 is located at the large-diameter section 24 at the lower end of the connecting sleeve 23 and abuts against the bottom surface of the small-diameter section 25 of the connecting sleeve 23, thereby enabling the planar thrust bearing and guide sleeve 8 to better support the connecting sleeve 23. Furthermore, the support shaft 3 has a central hole 35, and the platform 11 has a through hole 13 that is coaxial with and communicates with the central hole 35. This structure facilitates subsequent electrical connection and communication via slip rings.

[0043] As attached Figure 1 As shown, the motor 6 is mounted on the base plate 21, and the motor 6 is embedded in the clearance hole 26 opened on the base plate 21. This helps to reduce the height space occupied by the motor 6 and reduce the height of the equipment.

[0044] As attached Figure 1 Appendix Figure 3 As shown, the rotating seat 2 is provided with a conveying device 9. The conveying device 9 can be a known roller conveyor or belt conveyor. Preferably, the conveying device includes a frame provided on the rotating seat 2 and a set of chain plate conveying mechanisms spaced apart on the frame.

[0045] As attached Figure 3 As shown, the specific number of the chain plate conveying mechanism is three, and each chain plate conveying mechanism includes a first sprocket 91 and a second sprocket 92 located at both ends. There are two first sprockets 91 and two second sprockets 92. A chain 93 is sleeved on the first sprocket 91 and the second sprocket 92 at the corresponding positions. There are chain plate connecting pieces 94 on the two chains 93. Chain plates 95 are installed on the chain plate connecting pieces 94.

[0046] As attached Figure 3As shown, a group of first sprockets 91 of the chain conveyor mechanism are collectively mounted on a first rotating shaft 96. The first rotating shaft 96 is rotatably mounted on two side frames 97 of the frame and connected to a drive motor 98 that drives its rotation. The drive motor 98 is mounted on the base plate 21 of the rotating seat 2. The drive motor 98 is connected to the first rotating shaft 96 through a chain transmission structure 99 or a synchronous belt transmission mechanism. The second sprockets 92 of each chain conveyor mechanism are rotatably mounted on a second rotating shaft 910. The two second rotating shafts 910 located on both sides are mounted on a support frame 911 on one side frame 97 and the base plate 21, and the second rotating shaft 910 located in the middle is mounted on two support frames 911. The two support frames 911 and the two side frames 97 together constitute the frame of the conveyor device.

[0047] As attached Figure 3 As shown, the second rotating shaft 910 is movably mounted on the frame of the rotating seat 2 along the conveying direction of the chain conveyor mechanism. The frame is provided with an adjustment mechanism 912 for adjusting the position of the second rotating shaft 910. This allows for individual tensioning of the chain 93 of each chain conveyor mechanism, thereby ensuring the stability of the conveying. The specific structure of the adjustment mechanism 912 is a known structure, such as the structure shown in application number 202120275139.2 or other feasible structures, which will not be elaborated here.

[0048] As attached Figure 3 As shown, guide wheels 10 are provided at both ends of the conveying device on the rotating seat 2. The top of the guide wheel 10 is at the same height as the conveying surface of the conveying device. The guide wheel 10 is set on the wheel frame located outside the mounting frame. At the same time, there are two guide wheels 10 at each end of the conveying device. The two guide wheels 10 have different lengths, with the outer guide wheel 10 being shorter than the inner guide wheel 10.

[0049] Example 2

[0050] This embodiment discloses a tray dispensing system, as shown in the attached figure. Figure 4 As shown, it includes a pallet splitting machine a, which can split stacked pallets and output them one by one to the rotating worktable b in the above embodiment for distribution. The output end of the rotating worktable b can be rotatably connected to the first distribution conveyor line c and the second distribution conveyor line d respectively.

[0051] The specific structure of the pallet splitting machine a can be any of the known structures. (See attached image.) Figure 4 Appendix Figure 5As shown, in this embodiment, the pallet splitting machine a includes a splitting conveyor line a1. The input end of the splitting conveyor line a1 is connected to the stacked pallet loading conveyor line (not shown in the figure), and its output end is connected to the input end of the conveying device 9 of the rotating worktable b.

[0052] The splitting conveyor line a1 can employ known feasible mechanisms, such as roller conveyors, intermittent belt conveyors, or chain conveyors. In this embodiment, as shown in the attached... Figure 6 As shown, the splitting conveyor line a1 includes two belt conveyor assemblies a11 spaced apart. The two belt conveyor assemblies a11 are mounted on a stand a12. Each belt conveyor assembly a11 has a baffle a15 located above its conveying surface on its outer side. The two baffles a15 can effectively restrict the position of stacked pallets on the two belt conveyor assemblies a11.

[0053] As attached Figure 6 - Appendix Figure 8 As shown, each of the belt conveyor assemblies a11 includes a main crossbeam a13 mounted on a vertical frame a12. The main crossbeam a13 includes a body a14, which is U-shaped with the slot facing downwards. Two strip-shaped limiting plates a115 extending along the length direction are provided at the upper gap of the body a14. A support limiting plate a112 located between the two strip-shaped limiting plates is also provided on the top plate of the body a14. End rollers a16 are respectively provided at both ends of the main crossbeam a13. The end rollers a16 are rotatably mounted on end mounting seats a17, which are engaged with the main crossbeam a13 of the belt conveyor assembly a11.

[0054] As attached Figure 6 - Appendix Figure 8 As shown, the end mounting base a17 includes two side plates a18 connected together. The two side plates a18 have coaxial mounting holes for mounting the end roller a16. The inner side of the two side plates a18 and near the upper end are formed with a stop block a19 corresponding to the two strip limiting plates a115. The stop block a19 is fitted to the outer side of its corresponding strip limiting plate a115, so that the two strip limiting plates a115 and the stop block a19 can cooperate to restrict the position of the end mounting base a17.

[0055] As attached Figure 6 - Appendix Figure 8As shown, an abutment plate a110 is also provided on the inner side of the end mounting base a17, and the top of the abutment plate a110 is separated from the bottom of the stop block a19. The gap is equivalent to the thickness of the top plate a114 of the body a14. The top plate of the body a14 is inserted into the gap, so that the top of the abutment plate a110 abuts against the bottom of the top plate a114, the bottom of the stop block a19 abuts against the top surface of the top plate a114, and the support plate a113 on the end mounting base abuts against the bottom surface of the top plate a114.

[0056] The belt (not shown in the figure) fitted between the two end rollers a16 effectively prevents the two end mounting seats a17 from separating from the main crossbeam a13. The roller shaft a111 of one end roller a16 in the belt conveyor assembly is connected to a structure that drives its rotation. The structure driving the rotation of the end roller a16 is known technology and will not be described in detail here. Alternatively, the two belt conveyor assemblies a11 can share a single motor; that is, the roller shaft a111 containing the two rollers at the same end of the two belt conveyor assemblies a11 can be a single shaft or connected via a connecting shaft, and this shaft or connecting shaft can be connected to the motor that drives its rotation.

[0057] As attached Figure 5 As shown, an upper lifting mechanism a2 is provided between the two belt conveyor assemblies a11 of the splitting conveyor line a1, as shown in the attached diagram. Figure 6 As shown, the lifting mechanism a2 can lift the trays on the two belt conveyor assemblies a11. The lifting mechanism a2 can adopt a known feasible structure. In this embodiment, the lifting mechanism a2 includes a lifting frame a21. The lifting frame a21 is driven to lift by a first lifting cylinder a22 and a second lifting cylinder a23. The first lifting cylinder a22 is fixed on the base a24, with its cylinder shaft facing upward and connected to a lifting plate a25. The second lifting cylinder a23 is arranged on the lifting plate a25. The second lifting cylinder a23 is located below the lifting plate a25, and its cylinder shaft extends above the lifting plate a25 and is connected to the lifting frame a21. The lifting plate a25 and the lifting frame are respectively connected to a guiding mechanism composed of a guide shaft and a guide sleeve. The specific structure of the guiding mechanism is not described here. This structure positions the first lifting cylinder a22 and the second lifting cylinder a23 between the lifting plate a25 and the base a24, which can reduce the space required for installation to a certain extent and improve the compactness.

[0058] As attached Figure 5 Appendix Figure 10 As shown, side frames a3 are provided on both sides of the conveying direction of the splitting conveyor line a1. The two side frames a3 are connected by a connecting beam and a swing arm assembly a4 is provided on each of the two side frames. The swing arm assembly a4 is higher than the conveying surface of the splitting conveyor line a1.

[0059] As attached Figure 10 As shown, the swing arm assembly a4 includes two supporting main shafts a41 rotatably mounted on a horizontal bar a31 of the side frame a3. Each supporting main shaft a41 is connected to a swing arm a42 and a synchronous transmission arm a43. The swing arm is L-shaped. A transmission rod a44 connects the two synchronous transmission arms a43. The transmission rod a44 is pivotally connected to the two synchronous transmission arms a43. One of the synchronous transmission arms a43 is also pivotally connected to one end of a swing driver a45 located between the two supporting main shafts a41. The other end of the swing driver a45 is pivotally connected to a connecting seat a46 located outside the horizontal bar. The swing driver a45 drives the two swing arms a42 to rotate synchronously between a first position and a second position, and the rotation of the two swing arms a42 is opposite. In the first position, the swing arm a42 extends above the conveying surface of the splitting conveyor line a1; in the second position, the swing arm a42 is located outside the splitting conveyor line a1.

[0060] This structure can drive two swing arms a42 to swing synchronously through a cylinder. At the same time, the swing directions of the two swing arms a42 are opposite, which can effectively prevent the swing arms a42 from contacting the sides of the pallet during the swing process. It can also keep the swing arms as close as possible to the sides of the pallet to ensure the stability of the support. Moreover, compared with the structure that rotates in the same direction, the top mechanism requires less installation space.

[0061] As attached Figure 10 As shown, the supporting spindle a41 is mounted on the horizontal rod a31 via seated bearings a47 located above and below the horizontal rod a31. This allows the supporting spindle a41 to be longer and provides better support. Meanwhile, one of the synchronous transmission arms a43 is S-shaped or Z-shaped. This synchronous transmission arm a43 is coaxially connected to one of the supporting spindles a41, and its first end a48, biased towards the outside of the side frame a3, is pivotally connected to the swing actuator a45. Its second end a49 (biased towards the inside of the side frame) is pivotally connected to one end of the transmission rod a44. The other synchronous transmission arm a43 is L-shaped, with its third end a410 pivotally connected to another supporting spindle a41, and its fourth end a411 biased towards the outside of the side frame a3 and pivotally connected to one end of the transmission rod a44.

[0062] As attached Figure 10 As shown, the transmission rod a44 is connected to the synchronous transmission arm a43 through the rod end joint bearing a412. With this structure, the rod end joint bearing has a larger adjustment space, which makes it easier for the transmission rod a44 to drive the two synchronous transmission arms a43 to move together.

[0063] As attached Figure 5As shown, each side frame a3 is provided with a set of baffles a32 located outside the baffle a15 and adjacent to the baffle a15. The set of baffles a32 is perpendicular to the conveying surface of the split conveyor line a1. This structure can effectively avoid the risk of the stacked pallets tipping over when the stacked pallets are lifted and lowered.

[0064] When the pallet splitting machine a is working, in the initial state, the swing arm a42 is in the second position. At this time, the splitting conveyor line a1 transports the stacked pallets to the swing arm assembly a4. Then, the lifting mechanism a2 lifts all the pallets on the splitting conveyor line a1 to the position where the height of the second layer of pallets matches that of the swing arm a42 of the swing arm assembly a4. Then, the swing actuator a45 drives the swing arm a42 to switch from the second position to the first position. At this time, the four swing arms a42 extend into the bottom or interior of the second-layer tray. Next, the lifting mechanism a2 drives the first-layer tray located above it to move downwards onto the splitting conveyor line a1 and output it outwards. Then, the lifting mechanism a2 lifts again to support all the trays held by the swing arms a42. Then, the swing actuator a45 drives the swing arm a42 to switch from the first position to the second position. At this time, the lifting mechanism a2 moves the tray currently on the bottom layer down to below the swing arm a42, but above the splitting conveyor line a1. Then, the swing actuator a45 drives the swing arm a42 to switch back to the second position to support the trays currently on the second layer and above it. Then, the lifting mechanism a2 descends to drop the trays on it back onto the splitting conveyor line a1 for output. The above process is repeated until all the trays are output one by one from the splitting conveyor line a1.

[0065] After the splitting conveyor line a1 outputs a pallet to the rotating worktable b, the rotating worktable b can rotate and connect with the first distribution conveyor line c or the second distribution conveyor line d according to the subsequent system's demand for the pallet. Then, the conveying device 9 starts to transport the pallet to the first distribution conveyor line or the second conveyor line, thereby distributing the pallet to different positions for reuse.

[0066] This invention has many other embodiments, and all technical solutions formed by equivalent transformation or equivalent transformation fall within the protection scope of this invention.

Claims

1. A pallet dispensing system, characterized in that: It includes a pallet splitting machine (a) and a rotating worktable (b), wherein the pallet splitting machine (a) can split stacked pallets and output them one by one to the rotating worktable (b); The rotating worktable (b) includes a base (1) and a rotating seat (2) rotatably mounted on the base (1). A support shaft (3) is fixedly mounted on the base (1). The rotating seat (2) is rotatably mounted on the support shaft (3), and the bottom plate (21) of the rotating seat (2) is fitted around the outer periphery of the support shaft (3) and close to the lower end of the support shaft (3). A fixed gear (4) is mounted on the support shaft (3), and the fixed gear (4) meshes with a movable gear (5) located on its outer side. The movable gear (5) is driven to rotate by a motor (6) located on the rotating seat (2). The base (1) also has a set of universal balls for supporting the rotating seat (2). An upper bearing (7) and a planar thrust bearing or guide sleeve (8) located below the upper bearing (7) are coaxially mounted on the support shaft (3). (2) The connecting sleeve (23) is fitted on the outer periphery of the upper bearing (7) and the planar thrust bearing or guide sleeve (8); the support shaft (3) includes a first section (32), a second section (33) and a third section (34) whose outer diameter increases from top to bottom. The fixed gear (4) is fixed on the first section (32). The upper bearing (7) is fitted on the second section (33) and close to the first section (32). The planar thrust bearing or guide sleeve (8) is fitted on the second section (33) and abuts against the top surface of the third section (34). The connecting sleeve (23) is fitted on the outer periphery of the upper bearing (7) and the planar thrust bearing or guide sleeve (8). The planar thrust bearing or guide sleeve (8) is located in the large-diameter section (24) at the lower end of the connecting sleeve (23) and abuts against the bottom surface of the small-diameter section (25) of the connecting sleeve (23). The pallet splitting machine (a) includes a splitting conveyor line (a1), an upper lifting mechanism (a2) is provided on the splitting conveyor line (a1), side frames (a3) ​​are provided on both sides of the conveying direction of the splitting conveyor line (a1), and swing arm assemblies (a4) are respectively provided on the two side frames (a3). The lifting mechanism (a2) includes a lifting frame (a21), which is driven to lift by a first lifting cylinder (a22) and a second lifting cylinder (a23). The first lifting cylinder (a22) is fixed on the base (a24), with its cylinder shaft facing upward and connected to a lifting plate (a25). The second lifting cylinder (a23) is provided on the lifting plate (a25), which is located below the lifting plate (a25) and its cylinder shaft extends above the lifting plate (a25) and is connected to the lifting frame (a21). The swing arm assembly (a4) includes two supporting spindles (a41) rotatably mounted on a horizontal bar (a31) of the side frame (a3). Each supporting spindle (a41) is connected to a swing arm (a42) and a synchronous transmission arm (a43). The swing arm is L-shaped. A transmission rod (a44) connects the two synchronous transmission arms (a43), and the transmission rod (a44) is pivotally connected to the two synchronous transmission arms (a43). One of the synchronous transmission arms (a43) is also pivotally connected to one end of a swing actuator (a45) located between the two supporting spindles (a41). The other end of the swing actuator (a45) is pivotally connected to a connecting seat (a46). The swing actuator (a45) drives the two... The swing arms (a42) rotate synchronously between a first position and a second position, and the two swing arms (a42) rotate in opposite directions; one of the synchronous transmission arms (a43) is S-shaped or Z-shaped, and is coaxially connected to a support main shaft (a41). The first end (a48) of the synchronous transmission arm (a43) biased towards the outside of the side frame (a3) ​​is pivotally connected to the swing driver (a45), and its second end (a49) is pivotally connected to one end of the transmission rod (a44); the other synchronous transmission arm (a43) is L-shaped, and its third end (a410) is pivotally connected to another support main shaft (a41), and its fourth end (a411) biased towards the outside of the side frame (a3) ​​and pivotally connected to one end of the transmission rod (a44).

Images