A belt conveyor device

Abstract

The present invention discloses a belt conveyor device, which belongs to the field of belt transmission technology. The belt conveyor device includes a conveying fixed plate and a conveying movable plate arranged on the conveying fixed plate, and the conveying movable plate can move up and down relative to the conveying fixed plate; it also includes a belt transmission mechanism, and the belt transmission mechanism includes a belt and a driving wheel, a driven wheel and a tensioning wheel for winding the belt; wherein the driving wheel is rotatably arranged on the conveying fixed plate; the driven wheel and the tensioning wheel are rotatably arranged on the conveying movable plate; the tensioning wheel can move up and down with the conveying movable plate, so that the height of the tensioning wheel relative to the driving wheel changes, thereby changing the tensioning state of the belt. The belt conveyor device of the present invention can realize the rapid replacement of the belt only by adjusting the up and down position of the conveying movable plate, and can still ensure the tensioning state of the belt after replacement, thereby shortening the downtime.

Description

Technical Field

[0001] The present invention relates to the technical field of belt transmission, and in particular to a belt conveyor device. Background Art

[0002] Belt conveyors are a common material transport method in production and life. Due to long-term operation, the friction between the belt and the material, as well as the friction between the belt and the pulley, can damage the belt. Therefore, damaged belts need to be replaced at regular intervals. Currently, replacing a belt requires disassembling the conveyor motor, conveyor pulley, or tensioner. This process is cumbersome and inefficient, resulting in long conveyor downtime, disrupting normal production, and causing unnecessary economic losses.

[0003] Therefore, it is urgent to provide a belt conveyor device to solve the above problems. Summary of the Invention

[0004] The object of the present invention is to provide a belt conveyor device that can realize rapid replacement of the belt, shorten the downtime, and avoid the influence of excessive downtime on normal production.

[0005] To achieve the above objectives, the following technical solutions are provided:

[0006] A belt conveyor device comprises a conveying fixed plate and a conveying movable plate provided on the conveying fixed plate, wherein the conveying movable plate can move up and down relative to the conveying fixed plate;

[0007] It also includes a belt transmission mechanism, which includes a belt and a driving wheel, a driven wheel and a tensioning wheel for winding the belt; wherein the driving wheel is rotatably mounted on the conveying fixed plate; the driven wheel and the tensioning wheel are rotatably mounted on the conveying movable plate;

[0008] The tensioning wheel can move up and down along with the conveying movable plate, so that the height of the tensioning wheel relative to the driving wheel changes, thereby changing the tensioning state of the belt.

[0009] Preferably, a pressure plate is provided on the top of the fixed conveying plate, and the pressure plate can extend to above the driven wheel of the movable conveying plate;

[0010] The pressure plate and the conveying movable plate are connected by a threaded fastener; a through hole is provided on the pressure plate, and a threaded hole is provided on the top of the conveying movable plate. The threaded fastener passes through the through hole from top to bottom and is locked on the pressure plate. By twisting the threaded fastener, the conveying movable plate can be moved up and down relative to the conveying fixed plate.

[0011] Preferably, the pressure plates are provided in plurality, including two end pressure plates respectively provided at both ends of the conveying fixed plate along the first direction and an intermediate pressure plate provided between the two end pressure plates; the threaded fasteners are provided on the intermediate pressure plate.

[0012] Preferably, the belt conveyor device also includes a limit member, and a limit groove extending in the vertical direction is opened on the conveying fixed plate. The limit member is connected to the conveying movable plate after passing through the limit groove, and the limit member realizes the limitation of the upward and downward movement of the conveying movable plate by abutting against the top or bottom of the limit groove.

[0013] Preferably, the limiting member includes a head and a rod body vertically connected to each other, the rod body of the limiting member extends into the limiting groove and is connected to the conveying movable plate; the head of the limiting member is exposed outside the conveying fixed plate and abuts against the conveying fixed plate.

[0014] Preferably, the heights of the driven wheel, the tensioning wheel and the driving wheel decrease in sequence.

[0015] Preferably, the tensioning wheel includes a first tensioning wheel and a second tensioning wheel, wherein the first tensioning wheel and the driving wheel are both located at one end of the belt transmission mechanism along the first direction, and the second tensioning wheel is located at the other end of the belt transmission mechanism along the first direction.

[0016] Preferably, two first tensioning wheels are provided along the first direction, and the two first tensioning wheels are symmetrically distributed relative to the driving wheel.

[0017] Preferably, there are multiple driven wheels, and the multiple driven wheels are evenly distributed along the first direction; a belt supporting wheel is provided between every two adjacent driven wheels for supporting the belt.

[0018] Preferably, the belt conveyor device further comprises a fixed plate, a lifting member is provided at the bottom of the fixed plate, and a driving end of the lifting member is connected to the conveying fixed plate to drive the conveying fixed plate to move in the vertical direction;

[0019] The conveying fixed plate and the fixed plate are slidably connected via a slide rail and slide groove structure to guide the conveying top plate to move in a vertical direction.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The belt conveyor device of the present invention can realize the rapid replacement of the belt only by adjusting the upper and lower positions of the conveying movable plate, and can still ensure the tension state of the belt after replacement. It has a simple structure and is easy to operate. There is no need to disassemble and assemble the conveying motor, conveying wheel or tensioning wheel, which improves the replacement efficiency, shortens the downtime, and avoids the impact of long-term downtime on normal production. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 2 is a schematic structural diagram of a belt conveyor device according to an embodiment of the present invention at a first viewing angle;

[0023] Figure 2 This is a front view of a belt conveyor device according to an embodiment of the present invention;

[0024] Figure 3 This is a rear view of the belt conveyor device in an embodiment of the present invention;

[0025] Figure 4 2 is a schematic structural diagram of a belt conveyor device according to an embodiment of the present invention at a second viewing angle;

[0026] Figure 5 for Figure 3 The cross-sectional view of the AA surface;

[0027] Figure 6 for Figure 1 Enlarged view of point B in the middle;

[0028] Figure 7 for Figure 2 Enlarged view of point C in the middle.

[0029] Reference numerals:

[0030] 10- fixed conveying plate; 20- movable conveying plate; 30- fixed plate; 40- belt conveying mechanism; 50- pressing plate; 60- limiting member;

[0031] 11-Limiting slot; 12-T-slot; 13-Light shielding frame; 14-Sensor bracket; 21-Mounting hole; 31-Lifting member; 32-Connecting member; 33-Photoelectric switch; 34-Slide rail and slideway structure; 35-Limiting block; 41-Drive wheel; 42-Driven wheel; 43-First tensioning wheel; 44-Second tensioning wheel; 45-Belt; 46-Drive motor; 47-First mounting bracket; 48-Second mounting bracket; 49-Belt support pulley;

[0032] 51-through hole; 52-end pressure plate; 53-middle pressure plate; 61-head; 62-rod body;

[0033] 121 - first groove body; 122 - second groove body; 321 - abutment portion; 322 - piston connection portion; 521 - curved surface portion; 522 - flat surface portion. DETAILED DESCRIPTION

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0037] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the 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 limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0038] In the description of the present invention, it should be noted that, unless otherwise specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0039] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0040] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0041] like Figure 1 and 2 As shown, this embodiment provides a belt conveyor device, including a conveying fixed plate 10 and a conveying movable plate 20 provided on the conveying fixed plate 10, and the conveying movable plate 20 can move up and down relative to the conveying fixed plate 10; it also includes a belt conveying mechanism 40, the belt conveying mechanism 40 includes a belt 45 and a driving wheel 41, a driven wheel 42 and a tensioning wheel for winding the belt 45, wherein the driving wheel 41 is rotatably provided on the conveying fixed plate 10; the driven wheel 42 and the tensioning wheel are rotatably provided on the conveying movable plate 20; the tensioning wheel can move up and down together with the conveying movable plate 20, so that the height of the tensioning wheel relative to the driving wheel 41 changes, thereby changing the tensioning state of the belt 45.

[0042] In this embodiment, the heights of the driven wheel 42, the tensioning wheel, and the driving wheel 41 are sequentially reduced. Furthermore, the tensioning wheel includes a first tensioning wheel 43 and a second tensioning wheel 44, wherein the first tensioning wheel 43 is arranged close to the driving wheel 41, and the second tensioning wheel 44 is arranged away from the driving wheel 41; preferably, the first tensioning wheel 43 and the driving wheel 41 are both located at one end of the belt transmission mechanism 40 along the first direction, and the second tensioning wheel 44 is located at the other end of the belt transmission mechanism 40 along the first direction; Figure 2, viewed clockwise, the belt 45 is wound upward from the drive pulley 41, around the upper portion of the first tensioning pulley 43, and then around the lower portion of the second tensioning pulley 44, to be wound around the driven pulley 42, achieving tension. Further preferably, two first tensioning pulleys 43 are provided along the first direction, symmetrically distributed relative to the drive pulley 41. This ensures overall tensioning even when the belt 45 is long. When the first tensioning pulleys 43 move up and down with the conveyor plate 20, the belt 45 can be simultaneously tensioned or relaxed on both sides of the drive pulley 41, facilitating rapid tensioning of the belt 45 and convenient replacement after relaxation. The first direction is the lengthwise direction of the conveyor fixed plate 10 and the conveyor movable plate 20.

[0043] Further, continue to refer to Figure 1 、 Figure 2 and Figure 5 A pressure plate 50 is provided on the top of the fixed conveyor plate 10. The pressure plate 50 can extend to the top of the driven wheel 42 of the movable conveyor plate 20 to limit the belt 45 on the driven wheel 42, thereby preventing the belt 45 from being separated from the driven wheel 42 and ensuring smooth conveying of the belt 45. Furthermore, the pressure plate 50 is connected to the movable conveyor plate 20 by a threaded fastener. Figure 1 and Figure 6 A through hole 51 is provided on the pressure plate 50, and a threaded hole is provided on the top of the conveying movable plate 20. The threaded fastener passes through the through hole 51 from top to bottom and is locked on the pressure plate 50, thereby achieving relative fixation of the conveying movable plate 20, the pressure plate 50 and the conveying fixed plate 10; when it is necessary to replace the belt 45, the threaded fastener is loosened, the conveying movable plate 20 moves downward relative to the conveying fixed plate 10, and the first tensioning wheel 43 located on the conveying movable plate 20 moves downward relative to the driving wheel 41, the belt 45 is no longer kept tensioned, and a gap is generated between the belt 45 and the driving wheel 41. The gap between the pressure plate 50 and the belt 45 increases, and the personnel remove the old belt through the gap and insert a new belt. After the new belt is inserted, the threaded fastener is tightened to move the conveying movable plate 20 upward relative to the conveying fixed plate 10. The first tensioning wheel 43 and the second tensioning wheel 44 cooperate to complete the re-tensioning of the belt 45. The belt 45 is fitted with the driving wheel 41. At the same time, the gap between the pressure plate 50 and the belt 45 is reduced, and the belt 45 is restricted again. The entire belt conveyor mechanism 40 resumes normal operation. Optionally, the threaded fastener can be a tension bolt or other fastening structure with threads.

[0044] The belt conveyor device of the present invention can realize the tensioning and relaxation of the belt 45 only by adjusting the upper and lower positions of the conveying movable plate 20. When the belt 45 is in a relaxed state, it can be quickly replaced. After the replacement is completed, the position of the conveying movable plate 20 is adjusted to keep the tensioning wheel continuously tensioned. The entire belt conveyor device has a simple structure and is easy to operate. There is no need to disassemble and assemble the conveying motor, conveying wheel or tensioning wheel, which improves the replacement efficiency, shortens the downtime, and avoids long-term downtime affecting normal production.

[0045] Optionally, in this embodiment, reference Figure 1 and Figure 4 The drive wheel 41 is driven by a drive motor 46. The main body of the drive motor 46 is mounted on the fixed conveyor plate 10, and the output end of the drive motor 46 is connected to the drive wheel 41 to ensure that the drive wheel 41 is fixed relative to the fixed conveyor plate 10. Furthermore, when the belt 45 is tensioned, the top surface of the fixed conveyor plate 10 should be flush with the top surface of the movable conveyor plate 20. This facilitates the positioning of the belt 45 by the pressure plate 50 and also facilitates tensioning between the pressure plate 50 and the movable conveyor plate 20 via threaded fasteners. Furthermore, in this embodiment, the height dimension of the movable conveyor plate 20 is smaller than that of the fixed conveyor plate 10 to minimize the weight of the movable conveyor plate 20 and reduce the tensioning force required for its movement. Furthermore, the driving motor 46 is arranged at the bottom of the conveying fixed plate 10 through the first mounting bracket 47, and the tensioning wheel is arranged at the bottom of the conveying movable plate 20 through the second mounting bracket 48; the driving module and the tensioning module are set as independent modules and installed on the corresponding plates through mounting parts. Once a problem occurs in a module, it can be disassembled, adjusted or replaced through the first mounting bracket 47 and the second mounting bracket 48.

[0046] Continue to refer Figure 1 and Figure 2 In this embodiment, a plurality of driven wheels 42 are provided, and the plurality of driven wheels 42 are evenly distributed along the first direction to improve the stability of the belt 45 transmission. Further, optionally, a belt support wheel 49 is provided between every two adjacent driven wheels 42 to support the belt 45 and fully ensure that the belt 45 is level during the transmission process. Furthermore, in the case where the belt 45 is transmitted along the first direction for a long distance, in order to ensure that the belt 45 does not separate from the driven wheels 42, a plurality of pressure plates 50 are also provided accordingly, referring to Figure 1Specifically, the conveyor plate 20 includes two end pressure plates 52, one at each end of the conveyor plate 10 along the first direction, and an intermediate pressure plate 53, disposed between the two end pressure plates 52. Preferably, the two end pressure plates 52 are not provided with threaded fasteners, but only the intermediate pressure plate 53 is provided with threaded fasteners. This ensures that the end pressure plates 52 also have a certain limiting effect during the belt 45 replacement process, facilitating the installation of a new belt. Furthermore, the intermediate pressure plate 53 includes multiple first pressure plates and a second pressure plate disposed between two adjacent first pressure plates. The first pressure plates are longer than the second pressure plates, and multiple threaded fasteners are spaced apart on each first pressure plate. In specific implementation, the threaded fasteners on different first pressure plates can be selectively loosened or tightened according to the different installation conditions of the belt 45 along the first direction, making the adjustment of the conveyor plate 20 more flexible. If the intermediate pressure plate 53 is a single intermediate pressure plate, due to its excessive length, the multiple threaded fasteners will restrict each other, resulting in poor adjustability of the entire conveyor plate 20. Optionally, in this embodiment, three first pressure plates are provided, and two second pressure plates are provided between two adjacent first pressure plates; two threaded fasteners are provided on each first pressure plate at intervals along the first direction, and the threaded fasteners are provided as close as possible to the end of the first pressure plate along the first direction to improve the pulling effect on the conveying movable plate 20.

[0047] Optionally, refer to Figure 6 The bottom surface of the end pressure plate 52 includes a smoothly connected curved surface portion 521 and a flat surface portion 522, wherein the flat surface portion 522 is parallel to the first direction, and the curved surface portion 521 is parallel to the belt 45 wound around the driven wheel 42 at the end, so as to fully limit the belt 45 and prevent the belt 45 from detaching from the driven wheel 42 at the end.

[0048] Further, refer to Figure 3 、 4 5. The belt conveyor device also includes a limiter 60. A limiter groove 11 extending in the vertical direction is provided on the fixed conveyor plate 10. The limiter 60 passes through the limiter groove 11 and is connected to the movable conveyor plate 20. The limiter 60 has space for up and down movement in the limiter groove 11, thereby enabling the movable conveyor plate 20 to move up and down relative to the fixed conveyor plate 10. The limiter 60 can abut against the top or bottom of the limiter groove 11 to limit the up and down movement of the movable conveyor plate 20. Optionally, refer to Figure 5The limiting member 60 is a T-shaped structure, comprising a head 61 and a rod 62 connected perpendicularly to each other. The rod 62 of the limiting member 60 extends into the limiting groove 11 and is connected to the conveying movable plate 20. The rod 62 of the limiting member 60 can abut against the top or bottom of the limiting groove 11 to limit the up and down displacement of the conveying movable plate 20. The head 61 of the limiting member 60 is exposed outside the conveying fixed plate 10 and abuts against the conveying fixed plate 10 to limit the conveying movable plate 20 in a direction perpendicular to the conveying fixed plate 10, thereby preventing the conveying movable plate 20 from shaking in a direction perpendicular to the conveying fixed plate 10 when moving up and down. Preferably, the limiting groove 11 is a waist-shaped groove extending in the vertical direction. Optionally, a plurality of limiting grooves 11 and limiting members 60 are provided along the first direction, and correspond one to one to ensure that the movement of the conveying movable plate 20 is limited.

[0049] Furthermore, a positioning groove is provided on the side wall of the conveying movable plate 20 on the side near the conveying fixed plate 10. The rod portion of the limiting member 60 can be inserted into the positioning groove, achieving accurate insertion with the conveying movable plate 20 and facilitating the positioning of the limiting member 60 and the conveying movable plate 20. Furthermore, optionally, a mounting hole 21 is provided on the conveying movable plate 20. The mounting hole 21 is connected to the positioning groove. A fastener passes through the mounting hole 21 and connects to the first limiting member 60, thereby completing the fastening of the limiting member 60 to the conveying movable plate 20. The fastener can be accommodated in the mounting hole 21 to avoid exposure, thereby enhancing aesthetics. Optionally, the fastener is a fastening bolt.

[0050] refer to Figure 2 、 3 4. The belt conveyor device provided in this embodiment also includes a fixed plate 30. The conveying fixed plate 10 is provided on the fixed plate 30. The fixed plate 30 is used to install and fix the entire belt conveyor device on the corresponding workstation to complete the transmission and processing of the product. In this embodiment, the fixed plate 30 includes two side surfaces. The conveying fixed plate 10 is provided on one side surface of the fixed plate 30, and the other side surface of the fixed plate 30 is used to achieve the installation and fixation of the entire belt conveyor device. Furthermore, in a specific implementation, the length of the conveying fixed plate 10 and the conveying movable plate 20 along the first direction is the same, and the length of the fixed plate 30 and the conveying fixed plate 10 along the first direction is different, and the length of the fixed plate 30 is less than the length of the conveying fixed plate 10.

[0051] Further, refer to Figure 2 、 4 7, a lifting member 31 is provided at the bottom of the fixed plate 30, and the driving end of the lifting member 31 is connected to the conveying fixed plate 10. The lifting member 31 can drive the conveying fixed plate 10, the conveying movable plate 20 and the entire belt conveyor mechanism 40 to move up and down to adjust the height of the conveying plane of the belt conveyor device to meet the use requirements of the corresponding workstation. Further optionally, refer to Figure 2The conveying plate 10 and the fixed plate 30 are slidably connected by a slide rail and slide groove structure 34. Both the slide rail and the slide groove extend in the height direction to guide the movement of the conveying plate 10 in the height direction. Optionally, a plurality of lifting members 31 are arranged at intervals along the first direction, and a plurality of slide rail and slide groove structures 34 are also arranged at intervals along the first direction to ensure the consistency of the overall movement of the conveying plate 10. Furthermore, a limit block 35 is provided on the fixed plate 30. When the conveying plate 10 moves down to abut against the limit block 35, the conveying plate 10 reaches the downward limit position. Further, referring to Figure 3 and Figure 4 A dual photoelectric switch 33 is set on the second side of the fixed plate 30, and a light shielding frame 13 is set on the conveying fixed plate 10. The light shielding frame 13 triggers the photoelectric switch 33 to obtain the position information of the conveying fixed plate 10.

[0052] Optionally, the lifting member 31 may be a cylinder. Figure 7 The piston of the cylinder is provided with a connecting piece 32, and the connecting piece 32 includes a butt joint portion 321 and a piston connecting portion 322; accordingly, a T-slot 12 is provided at the bottom of the conveying fixed plate 10, and the T-slot 12 includes a first groove body 121 and a second groove body 122 that are vertically connected to each other. The butt joint portion 321 of the connecting piece 32 and the piston connecting portion 322 can be respectively inserted into the first groove body 121 and the second groove body 122 of the T-slot 12 in a direction perpendicular to the conveying fixed plate 10; when the piston drives the connecting piece 32 to rise, the butt joint portion 321 can abut against the groove top of the first groove body 121 to complete the upward driving of the conveying fixed plate 10, and when the piston rod drives the connecting piece 32 to move downward, the butt joint portion 321 can abut against the groove bottom of the first groove body 121 to realize the downward driving of the conveying fixed plate 10.

[0053] The belt conveyor provided in this embodiment can be used to convey circuit boards. In specific implementation, the entire belt conveyor is placed on the corresponding workstation through the fixed plate 30. At the same time, multiple position sensors are arranged at intervals along the first direction on the conveying fixed plate 10 to detect the movement position of the circuit board. Once the circuit board is detected to have moved to the corresponding position, the corresponding equipment on the workstation can be controlled to complete the placement, processing or unloading of the circuit board. Figure 1 and Figure 3 The position sensor is mounted on the conveyor plate 10 via a sensor bracket 14. Since the circuit board is relatively thin, in order to facilitate detection of the circuit board's position information, the gap between the two pressing plates 50 can preferably be used as a position detection position. The position sensor directly monitors the position of the circuit board through the gap between the pressing plates 50, avoiding the need to cut grooves on the pressing plates 50. In specific implementation, the setting of the position detection position can be combined with the number and length of the pressing plates 50 to optimize the design. This ensures that the belt 45 is prevented from falling off while also meeting the position monitoring requirements.

[0054] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A belt conveyor, characterized in that: It comprises a fixed conveying plate (10) and a movable conveying plate (20) arranged on the fixed conveying plate (10), wherein the movable conveying plate (20) can move up and down relative to the fixed conveying plate (10); The invention also includes a belt transmission mechanism (40), wherein the belt transmission mechanism (40) includes a belt (45) and a driving wheel (41), a driven wheel (42) and a tensioning wheel for winding the belt (45); wherein the driving wheel (41) is rotatably arranged on the conveying fixed plate (10); the driven wheel (42) and the tensioning wheel are rotatably arranged on the conveying movable plate (20); the heights of the driven wheel (42), the tensioning wheel and the driving wheel (41) are successively reduced; the tensioning wheel includes a first tensioning wheel (43) and a second tensioning wheel (44), wherein the first tensioning wheel (43) is arranged close to the driving wheel (41) and the second tensioning wheel (44) is arranged away from the driving wheel (41); The tensioning wheel can move up and down along with the conveying movable plate (20), so that the height of the tensioning wheel relative to the driving wheel (41) changes, thereby changing the tensioning state of the belt (45). When the belt (45) is in a relaxed state, it can be quickly replaced; A pressing plate (50) is provided on the top of the fixed conveying plate (10), and the pressing plate (50) can extend to above the driven wheel (42) of the movable conveying plate (20); The pressing plate (50) is connected to the conveying movable plate (20) by a threaded fastener; a through hole (51) is provided on the pressing plate (50), and a threaded hole is provided on the top of the conveying movable plate (20); the threaded fastener passes through the through hole (51) from top to bottom and is locked on the pressing plate (50), thereby achieving relative fixation between the conveying movable plate (20), the pressing plate (50) and the conveying fixed plate (10); by twisting the threaded fastener, the conveying movable plate (20) can be moved up and down relative to the conveying fixed plate (10).

2. The belt conveyor according to claim 1, wherein: The pressure plates (50) are provided in plurality, including two end pressure plates (52) respectively provided at both ends of the conveying fixed plate (10) along the first direction and an intermediate pressure plate (53) provided between the two end pressure plates (52); the threaded fasteners are provided on the intermediate pressure plate (53).

3. The belt conveyor according to claim 1, wherein: The belt conveyor device further comprises a limiting member (60), a limiting groove (11) extending in a vertical direction is provided on the conveying fixed plate (10), the limiting member (60) passes through the limiting groove (11) and is connected to the conveying movable plate (20), and the limiting member (60) achieves the limitation of the upward and downward movement of the conveying movable plate (20) by abutting against the groove top or groove bottom of the limiting groove (11).

4. The belt conveyor according to claim 3, characterized in that: The limiting member (60) comprises a head (61) and a rod body (62) connected to each other vertically, the rod body (62) of the limiting member (60) extends into the limiting groove (11) and is connected to the conveying movable plate (20); the head (61) of the limiting member (60) is exposed outside the conveying fixed plate (10) and abuts against the conveying fixed plate (10).

5. The belt conveyor according to claim 1, wherein: The first tensioning wheel (43) and the driving wheel (41) are both located at one end of the belt transmission mechanism (40) along a first direction, and the second tensioning wheel (44) is located at the other end of the belt transmission mechanism (40) along the first direction.

6. The belt conveyor according to claim 5, characterized in that: Two first tensioning wheels (43) are provided along the first direction, and the two first tensioning wheels (43) are symmetrically distributed relative to the driving wheel (41).

7. The belt conveyor according to claim 1, wherein: There are multiple driven wheels (42), and the multiple driven wheels (42) are evenly distributed along the first direction; a belt supporting wheel (49) is provided between every two adjacent driven wheels (42) for supporting the belt (45).

8. The belt conveyor according to claim 1, wherein: The belt conveyor device further comprises a fixed plate (30), a lifting member (31) is provided at the bottom of the fixed plate (30), and a driving end of the lifting member (31) is connected to the conveying fixed plate (10) to drive the conveying fixed plate (10) to move in a vertical direction; The conveying fixed plate (10) and the fixed plate (30) are slidably connected via a slide rail and slide groove structure (34) to guide the conveying fixed plate (10) to move in a vertical direction.

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