Liftable transfer device and material conveying system

Abstract

The present invention discloses a lifting and transferring device and a material conveying system, wherein the lifting and transferring device comprises a conveyor line, the conveyor line is connected to a chain lifting mechanism that drives it to move between a first height and a second height, the chain lifting mechanism comprises a first power source and the first power source is located on one side of the conveyor line, and the chain lifting mechanism applies an upward pulling force to the two opposite sides of the conveyor line. This scheme is exquisitely designed and simple in structure. The lifting and lowering of the conveyor line is achieved by a uniquely designed chain lifting mechanism, and only one power source is needed, which not only reduces costs and energy consumption, but also makes the lifting and lowering control of the conveyor line simple, and the control difficulty is greatly reduced compared to the control of two power sources.

Description

Technical Field

[0001] The invention relates to the technical field of material conveying, and in particular to a lifting and transferring device. Background Art

[0002] With the rapid development of industrial automation, the transportation of various items in the process of enterprise production and logistics sorting is often achieved with the help of assembly lines. As a result, various conveyor line equipment has been developed and applied.

[0003] Conventional belt conveyors, roller conveyors or chain conveyors, etc., are often fixed in position when in use. For some double-layer or multi-layer conveyor lines, it is often necessary to achieve docking of conveyor lines on different layers, and such fixed-structure conveyor lines cannot be moved up and down for docking. Therefore, some existing designs place these conveyor lines on a lifting device so that the conveyor lines can be lifted and lowered to achieve docking between conveyor lines at different heights. For example, patent application No. 201711033042.5 discloses a box-type conveyor line reciprocating lifter, which realizes the lifting of the conveyor line by setting a lead screw and a motor on both sides of the conveyor line. However, the defects of this structure are:

[0004] Two motors are required to drive the system, which increases the number of power sources and energy consumption. In addition, due to the presence of two motors, in order to ensure the synchronous movement of both sides of the conveyor line and the consistency of both sides, it is necessary to effectively control the start and stop, rotation direction, speed, etc. of the two motors, which increases the control accuracy requirements of the two motors and increases the control difficulty. Summary of the invention

[0005] The purpose of the present invention is to solve the above problems existing in the prior art and to provide a lifting and transferring device and a material conveying system.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] The liftable transfer device comprises a conveyor line, wherein the conveyor line is connected to a chain lift mechanism that drives the conveyor line to move between a first height and a second height, wherein the chain lift mechanism comprises a first power source and the first power source is located on one side of the conveyor line, and the chain lift mechanism applies an upward pulling force to opposite sides of the conveyor line.

[0008] Preferably, in the liftable transfer device, the conveyor line is slidably arranged on a guide rail on the frame via a slider.

[0009] Preferably, in the liftable transfer device, the conveyor line includes a base frame, both sides of the base frame are of equal height and two rows of rotatable rollers are arranged in a gap, grooves are formed on the surfaces of the rollers, and belts are respectively mounted on the two rows of rollers, and the two rows of rollers are driven by a second power source.

[0010] Preferably, in the liftable transfer device, the diameter of the roller located in the middle of the rollers is smaller than the diameter of the rollers located at both ends, and the top of the roller in the middle is at the same height as the top of the rollers at both ends.

[0011] Preferably, in the liftable transfer device, the roller at the middle position is a Teflon roller or the circumferential surface of the roller is coated with Teflon coating.

[0012] Preferably, in the liftable transfer device, guide plates located on the base frame are respectively provided above the outer sides of the two belts, and the two guide plates form a trumpet-shaped guide opening with a larger outer end and a smaller inner end.

[0013] Preferably, in the liftable transfer device, one end of the two belts is further provided with a baffle plate located on the base frame and higher than the top of the roller, and a buffer pad is provided on the inner end surface of the baffle plate.

[0014] Preferably, in the liftable transfer device, the chain lifting mechanism includes at least one supporting shaft, the supporting shaft is connected to the first power source driving the lifting thereof and two first sprockets are rotatably provided at both ends thereof, the two first sprockets are respectively meshed with a first chain, the first end of the first chain is fixed to the frame, the second end is fixed to one side of the conveyor line, the second end is higher than the first end; the chain lifting mechanism also includes at least two second sprockets and at least two third sprockets rotatably provided on both sides of the bottom of the conveyor line, each pair of second sprockets and third sprockets positioned opposite to each other are meshed with a second chain, the second chain extends in a Z shape, the third end and the fourth end are respectively fixed to the frame, and the fixed height of the third end is higher than the fixed height of the fourth end.

[0015] Preferably, in the liftable transfer device, the first power source is a pneumatic cylinder, an oil cylinder or an electric cylinder, and the support shaft is connected to the movable part of the first power source.

[0016] Preferably, the liftable and transferable device comprises at least two transmission lines with a height difference, and any of the liftable and transferable devices described above is arranged at the same end of the two transmission lines.

[0017] The advantages of the technical solution of the present invention are mainly reflected in:

[0018] 1. This solution is exquisitely designed and simple in structure. It realizes the up and down lifting of the conveyor line through the uniquely designed chain lifting mechanism. Only one power source is needed, which not only reduces the cost and energy consumption, but also makes the lifting and lowering control of the conveyor line simple. Compared with the control of two power sources, the control difficulty is greatly reduced.

[0019] 2. Multiple rollers are set on the conveyor line to fully support the belt, which is more convenient for material transportation and is also conducive to maintenance and replacement. The diameter of the roller in the middle is smaller than the rollers at both ends. While ensuring that the upper part of the roller is in contact with the belt, the lower part of the middle roller does not contact the roller, reducing the wear on the belt, making the belt more durable and saving costs.

[0020] 3. A guide plate is provided on the conveyor line to prevent the items from being deflected. The guide plate has a trumpet-shaped opening, which increases the opening area, making it easier for items to enter the conveyor line and improving the fault tolerance of the item placement during transportation.

[0021] 4. A baffle is set on the frame to prevent the material from moving forward. A buffer pad is set at the corresponding position on the baffle to avoid hard contact between the object and the baffle and reduce wear on the object.

[0022] 5. The first power source can be a pneumatic cylinder, an oil cylinder or an electric cylinder. There are many options and it can be selected according to different application occasions, which has good flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 is a front view of the liftable transfer device of the present invention;

[0024] FIG2 is a top view of the liftable transfer device of the present invention;

[0025] Figure 3 is a partial structural perspective view of the lifting and transferring device of the present invention;

[0026] Figure 4 is a top view of a second embodiment of the liftable transfer device of the present invention;

[0027] Figure 5 is a schematic diagram of a material conveying system of the present invention;

[0028] Figure 6 is a side view of a transmission line in a material conveying system of the present invention;

[0029] Figure 7 is a top view of a transmission line in a material conveying system of the present invention;

[0030] Figure 8 yes Figure 6 A magnified image of the middle A area;

[0031] Fig. 91 is a top view of another embodiment of a transmission line in a material conveying system of the present invention. DETAILED DESCRIPTION

[0032] The purpose, advantages and features of the present invention will be illustrated and explained by the non-limiting description of the following preferred embodiments. These embodiments are only typical examples of the application of the technical solution of the present invention, and any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of protection claimed by the present invention.

[0033] In the description of the scheme, it should be noted that the terms "center", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. Moreover, in the description of the scheme, with the operator as a reference, the direction close to the operator is the proximal end, and the direction away from the operator is the distal end.

[0034] The lifting and transferring device disclosed by the present invention is described below in conjunction with the accompanying drawings. Figure 1 As shown, it includes a conveyor line 2, which is connected to a chain lifting mechanism 3 that drives it to move between a first height and a second height. The chain lifting mechanism 3 includes a first power source 33 and the first power source 33 is located on one side of the conveyor line 2, and the chain lifting mechanism 3 applies an upward pulling force to the opposite sides of the conveyor line 2.

[0035] The conveyor line 2 may be any known conveyor line, such as a belt conveyor, a roller conveyor, a chain plate conveyor, a deflection wheel / ball conveyor, etc. However, considering the poor carrying capacity of the conventional belt conveyor line, the complex roller transmission structure of the roller conveyor, the complex structure and control of the deflection ball / wheel conveyor, etc., in this embodiment, as shown in the attached Figure 1As shown, the conveyor line 2 preferably includes a base frame 21, and the two sides of the base frame 21 are equal in height and two rows of rotatable rollers 22 are arranged in the gap, the surfaces of the rollers 22 are formed with grooves 221, and the two rows of rollers 22 are respectively provided with belts 23, and the belts 23 have convex strips (not shown in the figure) matching the grooves 221 on the rollers 22, so that the belt can be effectively prevented from running off. At the same time, since the gap is maintained between the two rows of rollers 22, the width of the belt can be effectively reduced, and the cost can be reduced. In combination with a row of rollers 22, the entire extended width of the belt can be effectively supported, thereby improving the carrying capacity of the conveyor line to meet the conveying requirements of items with larger dead weight.

[0036] Further, the two rows of rollers 22 are driven by a second power source 24. Specifically, as shown in the attached Figure 1 As shown, at least one pair of the two rows of rollers 22 are positioned opposite to each other and are fixed on a rotating shaft 25. The rotating shaft 25 is rotatably mounted on the frame 21, and one end of the rotating shaft 25 is connected to the power output shaft of the second power source 24 (a structure consisting of a motor or a motor and a gear + chain + sprocket) through an expansion sleeve or a coupling.

[0037] In addition, in order to reduce the wear of the belt 23 and increase the service life of the belt 23, as shown in the attached Figure 2 , Attachment Figure 3 As shown, the diameter of the roller 222 located in the middle of the rollers 22 is smaller than the diameter 223 of the rollers 223 located at both ends, and the top of the roller 222 in the middle is at the same height as the top of the rollers 223 at both ends, so that when in use, the rollers 222 in the middle can effectively provide support to ensure the load-bearing performance of the conveyor line, and at the same time they only contact with the inner surface of one side of the belt, thereby reducing wear.

[0038] Furthermore, the roller 222 in the middle position is a Teflon roller or the circumferential surface of the roller 222 is coated with Teflon coating, so that the self-lubricating properties of the Teflon material can be effectively utilized to reduce the friction between the roller 222 and the belt. On the one hand, it can reduce the difficulty of starting the conveyor line, and on the other hand, it can ensure the smoothness of the belt transmission; finally, the wear of the roller and the belt can be reduced.

[0039] Further, in order to prevent the risk of the items on the conveyor line 2 from being displaced or even falling off the two belts 23, as shown in the attached Figure 2 As shown, guide plates 26 located on the base frame 21 are respectively arranged above the outer sides of the two belts 23. The two guide plates 26 form a trumpet-shaped guide opening with a large outer end and a small inner end, so that the objects input onto the belts can be effectively guided to facilitate feeding.

[0040] In order to feed the material to the conveyor line 2, as shown in the attached Figure 2As shown, the articles rush out of the conveyor line 2, and a baffle 27 located on the base frame 21 and higher than the top of the roller is provided at one end of the two belts 23, and a buffer pad 28 is provided on the inner end surface of the baffle 27, so that the articles input into the conveyor line 2 can be blocked, and at the same time, the buffer pad 28 can avoid the impact caused by hard contact between the articles and the baffle 27, thereby ensuring the safety of the articles. The buffer pad can be various soft plastic materials or silica gel or sponge, etc.

[0041] In order to reduce the shaking of the conveyor line 2 as much as possible during the lifting process, the frame 1 is provided with a guide mechanism that cooperates with the lifting of the conveyor line 2, as shown in the attached Figure 1 As shown, the guide mechanism includes four sliders 4 distributed in a rectangular shape and arranged on the conveyor line 2. The sliders 4 are slidably arranged on the guide rails 5 on the frame 1. Therefore, during the lifting and lowering process of the conveyor line 2, the sliders 4 slide along the guide rails 5 and limit the position of the conveyor line 2.

[0042] In another embodiment, as shown in the attached Figure 4 As shown, in order to further improve the load-bearing performance of the conveyor line, a support platform 29 is further arranged between the two belts 23, and a group of wheels 210 are rotatably arranged on the support platform 29, and the top of the wheel 210 is flush with the upper surface of the belt 23.

[0043] As attached Figure 1 As shown, the chain lifting mechanism 3 includes at least one support shaft 31, and the support shaft 31 is located outside one side of the base frame 21 of the conveyor line, and its extension direction is parallel to the conveying direction of the conveyor line 2, the support shaft 31 is connected to the first power source 33 that drives its lifting and lowering, and two first sprockets 32 are rotatably provided at both ends through bearings, and the two first sprockets 32 are respectively engaged with a first chain 34, a first end 341 of the first chain 34 is fixed on the frame 1, and a second end 342 is fixed on one side of the conveyor line 2, and the second end is higher than the first end; when the first power source 33 drives the support shaft 31 to move upward, the second end of the first chain moves upward, thereby driving one side of the conveyor line 2 connected thereto to be lifted.

[0044] Further, as attached Figure 3As shown, the chain lifting mechanism 3 also includes at least two second sprockets 35 and at least two third sprockets 36 rotatably arranged on both sides of the bottom of the conveyor line, the positions of the second sprockets 35 and the third sprockets 36 correspond one to one, and are respectively fixed to the bottom two sides of the base frame 21 of the conveyor line 2 through the mounting frame 38, each pair of second sprockets 35 and third sprockets 36 in relative positions are meshed with a second chain 37, the second chain 37 extends in a Z shape and its third end 371 and fourth end 372 are respectively fixed to the frame 1, and the third end 371 is fixed to one side of the frame 1 close to the second sprocket 35, and the fourth end is fixed at a fixed position close to the first end of the first chain, and the height of the third end is higher than the fixed height of the fourth end 372, wherein the second sprocket 35 is located above the second chain 37, and the third sprocket 36 is located below the second chain.

[0045] Preferably, the first power source 33 is a pneumatic cylinder, an oil cylinder or an electric cylinder, and the support shaft 31 connects their movable parts. When the first power source 33 is a pneumatic cylinder, its cylinder shaft is connected to the middle position of the support shaft 31. When a pneumatic cylinder is used, the conveyor line can normally only switch between 2-3 height points, while when an oil cylinder or an electric cylinder is used, it can stop at any point within their travel range, thereby allowing the conveyor line 2 to have more flexible height selection.

[0046] During operation, when it is necessary to lift the conveyor line 2, the first power source 33 drives the support shaft 31 to rise, so that the first sprocket 32 ​​rises and drives the second ends of the two first chains to rise, and then drives one side of the conveyor line 2 connected thereto to rise, and the other end of the conveyor line 2 is synchronously lifted under the action of the second chain, the second sprocket and the third sprocket, finally realizing the overall lifting of the conveyor line 2; when it is necessary to lower the conveyor line 2, the first power source 33 drives the support shaft 31 to lower.

[0047] This solution further discloses a material conveying system, as shown in the attached Figure 5 As shown, at least two transmission lines 6 and 7 with a height difference are included, and the same end of the two transmission lines 6 and 7 is provided with the lifting and transferring device 10.

[0048] Among them, the transmission lines 6 and 7 can be various known conveyor lines, such as belt conveyors, roller conveyors, chain conveyors, deflection wheel / ball conveyors, etc. Considering that this scheme is used for the transportation of heavy objects, the structures of the transmission lines 6 and 7 are the same, and the transmission line 6 is used for explanation below.

[0049] As shown in the attached figure, Figure 6 , Attachment Figure 7As shown, the conveyor line 6 includes at least one conveying section, and the conveying section includes a frame 61. Two chain conveyor belts 62 with parallel conveying directions are arranged at the same height and in a gap on the frame 61. The width of the chain of each chain conveyor belt 62 does not exceed 1 / 4 of the width of the conveying surface of the conveying section.

[0050] The traditional full-width conveyor belt is replaced with two narrower chain conveyor belts. On the basis of ensuring the load-bearing performance, the width of the chain is reduced, thereby improving the strength of the chain and preventing the deformation of the chain. At the same time, compared with the roller conveyor line, no complicated transmission structure is required; and the gap between the two chain conveyor belts provides space for the installation of other equipment, which is convenient for use in combination with other equipment structures.

[0051] The two chain conveyor belts may have power sources respectively or share a power source. Preferably, they share a power source. Specifically, the chain conveyor belt includes two side plates 623 with gaps arranged on the top of the frame 61. A rotating shaft 622 is rotatably mounted on the same-direction ends of the side plates 623 of the two chain conveyor belts 62. For example, the rotating shaft 622 can rotate by two bearings installed on the side plates 623. A pair of sprocket wheels 621 for maintaining the gap are respectively arranged near the two ends of the rotating shaft 622. Figure 7 As shown, the rotating shaft 622 is connected to a power source 6280 that drives its rotation. The power source can be a motor connected to one end of the rotating shaft 622, or it can be a transmission mechanism composed of a motor through a belt and a pulley or a sprocket 6290 and a chain (not shown in the figure).

[0052] And, as attached Figure 6 , Attachment Figure 7 As shown, a support shaft 624 extending in a conveying direction perpendicular to the conveying line is provided at the other end of each side plate 623 relative to the same-direction end, and both ends of each support shaft 624 extend outside the two sides of the side plate 623, and one end of the support shaft 624 is rotatably provided with a sprocket 625 opposite to the sprocket 621 at the other end, a chain 626 is mounted on a pair of sprockets 621, 625 opposite to each other at both ends, and corresponding connecting pieces 627 are provided at the sides of two adjacent chains 626 close to each other, and a chain plate 628 is fixed on the pair of connecting pieces 627, and the top angles on both sides of the chain plate 628 are rounded, and the upper surface of the chain plate 628 protrudes from the upper surface of the chain.

[0053] In addition, in order to facilitate the installation of the chain 626 and adjust the tension of the chain 626 as needed to ensure sufficient support strength, the support shaft 624 can be moved along the first direction to adjust the distance between the two sprockets 621 and 625. Figure 8As shown, the support shaft 624 extends to the other end outside the side plate 623 and is connected to an adjusting screw 629. The connection structure of the adjusting screw 629 and the support shaft 624 is connected in accordance with the connection method of the screw and the movable nut of the lead screw, so that the position of the support shaft 624 on the adjusting screw 629 can be adjusted by rotating the adjusting screw 629. The adjusting screw 629 is rotatably arranged on a connecting seat 6210 fixed on the outer wall of the side plate 23. The position of the adjusting screw 629 on the connecting seat 210 does not move when the adjusting screw 629 rotates. A waist-shaped hole 2101 is provided on the connecting seat 6210 for the support shaft 24 to move. The support shaft 624 is also fixed in position by a nut 6220 and a gasket 6230.

[0054] At the same time, if attached Figure 7 As shown, the conveying section also includes a limiting rod 6240 located outside the two chain conveyor belts 62 and above their conveying surfaces, and the two ends of the two limiting rods 6240 are respectively formed into a trumpet shape with a larger outer end and a smaller inner end, so as to facilitate guiding of the objects, and the spacing between the limiting rods 6240 on both sides can be adjusted.

[0055] Specifically, as attached Figure 7 As shown, at least two mounting plates 6250 are respectively provided at the outer side walls of the side plates 623, and screw rods 260 are screwed on the mounting plates 6250, and the screw rods 260 are connected to the limiting rods 6240. In addition, sprocket wheels 6270 may be provided at the outer ends of the screw rods 6260, and the sprocket wheels 6270 on the screw rods 6260 connected to the same limiting rod 6240 are connected via chains (not shown in the figure), so that the adjustment of other screw rods can be driven by adjusting one screw rod 6260, thereby ensuring the synchronization and accuracy of the adjustment of different positions of the same limiting rod, and also increasing the adjustment efficiency.

[0056] Of course, the two limit rods 6240 connecting the screw rods 6260 can also be fixed on the mounting plate by a pair of nuts.

[0057] At the same time, in other structures, the two chain conveyor belts of the conveying section can also be replaced by two narrower belt conveyor belts or roller conveyor belts, and the driving structure can be adjusted as needed. However, compared with the chain conveyor line, the support and load-bearing performance of the belt conveyor line are relatively poor. When conveying items weighing dozens of kilograms or even heavier, the belt is likely to be damaged due to excessive load; when using a roller conveyor belt, although it can provide better support, it is necessary to use multiple sprockets and chains to realize the connection and transmission between the rollers, which increases the cost of parts and the complexity of assembly. On the one hand, due to the long conveyor line, the loss of power transmission increases, and the power requirements of the motor are increased.

[0058] Further, as attached Figure 7 As shown, a support portion 63 is further provided between the two chain conveyor belts 62, and the support portion 63 includes a mounting groove 632, in which a group of rollers 631 are rotatably mounted, and the top of the roller 631 is flush with the conveying surface of the conveying section, and the surface of the roller 631 is coated with Teflon coating, so that the self-lubricating properties of the material can be utilized to reduce friction and reduce resistance during the conveying process.

[0059] Of course, the support part 3 can also be other structures, such as another chain plate conveyor belt or a similar structure. Adding a support platform between two chain plate conveyor lines can, on the one hand, provide support for the conveyed heavy objects and further stabilize the conveying of the conveyor line; on the other hand, it can effectively reduce the load of the chain plate conveyor belt and reduce the possibility of its deformation.

[0060] As attached Fig. 9 As shown, the transmission line 6 includes at least two conveying sections as described above, and the conveying sections are butt-jointed end to end to form the transmission line 6.

[0061] When there are two conveying sections, they can share a power source, and when docked, the rotating shafts 622 of the two conveying sections are arranged relative to each other, and one of the rotating shafts 622 is connected to the power source, and the other rotating shaft is connected to the rotating shaft connected to the power source through a transmission mechanism composed of a chain and a sprocket 64.

[0062] When there are more conveying sections, a pair of adjacent conveying sections can share a power source, or they can also be provided with respective power sources.

[0063] There are many implementation methods of the present invention, and all technical solutions formed by equivalent transformation or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A lifting and transferring device, characterized in that: The conveyor line (2) is connected to a chain lifting mechanism (3) for driving the conveyor line (2) to move between a first height and a second height, the chain lifting mechanism (3) comprising a first power source (33) and the first power source (33) is located on one side of the conveyor line (2), and the chain lifting mechanism (3) applies an upward pulling force to two opposite sides of the conveyor line (2); The chain lifting mechanism (3) comprises at least one supporting shaft (31), the supporting shaft (31) being connected to the first power source (33) for driving the lifting thereof, and having two first sprockets (32) rotatably arranged at both ends thereof, the two first sprockets (32) respectively meshing with a first chain (34), the first end (341) of the first chain (34) being fixed on the frame (1), the second end (342) of the first chain (34) being fixed on one side of the conveying line (2), the second end (342) of the first chain (34) being higher than the first chain (34). a first end (341) of a chain (34); the chain lifting mechanism (3) further comprises at least two second sprockets (35) and at least two third sprockets (36) rotatably arranged on both sides of the bottom of the conveyor line, each pair of second sprockets (35) and third sprockets (36) positioned opposite to each other meshing with a second chain (37), the second chain (37) extending in a Z shape and the third end (371) and the fourth end (372) being respectively fixed on the frame (1), and the fixed height of the third end (371) is higher than the fixed height of the fourth end (372); The conveyor line (2) comprises a base frame (21), two sides of the base frame (21) are of equal height and two rows of rotatable rollers (22) are arranged in a gap, the surfaces of the rollers (22) are formed with grooves (221), and the two rows of rollers (22) are respectively provided with belts (23), and the two rows of rollers (22) are driven by a second power source (24); The diameter of the roller located in the middle of the rollers (22) is smaller than the diameter of the rollers located at the two ends, and the top of the roller in the middle is at the same height as the tops of the rollers at the two ends.

2. The lifting and transferring device according to claim 1, characterized in that: The conveyor line (2) is slidably arranged on a guide rail (5) on the frame (1) via a slider (4).

3. The lifting and transferring device according to claim 1, characterized in that: The roller at the middle position is a Teflon roller or the circumferential surface of the roller is coated with Teflon coating.

4. The lifting and transferring device according to claim 1, characterized in that: Guide plates (26) located on the base frame (21) are respectively arranged above the outer sides of the two belts (23), and the two guide plates (26) form a trumpet-shaped guide opening with a larger outer end and a smaller inner end.

5. The lifting and transferring device according to claim 1, characterized in that: One end of the two belts (23) is also provided with a baffle (27) located on the base frame (21) and higher than the top of the roller, and a buffer pad (28) is provided on the inner end surface of the baffle (27).

6. The lifting and transferring device according to claim 1, characterized in that: The first power source (33) is a pneumatic cylinder, an oil cylinder or an electric cylinder, and the support shaft (31) connects their movable parts.

7. Material conveying system, characterized by: It comprises at least two transmission lines (6, 7) with a height difference, wherein the same end of the two transmission lines (6, 7) is provided with a liftable transfer device (10) as claimed in any one of claims 1 to 6.

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