Feeding device of stamping production line

Abstract

The utility model discloses a feeding device of a stamping production line, which comprises door-shaped frames and a feeding device which are arranged on two sides of a conveying device, two emptying devices are arranged on the two door-shaped frames, each emptying device comprises an adsorption hand moving in the vertical direction and the transverse direction, the feeding device comprises a vehicle rail and an emptying vehicle, one end of the vehicle rail is arranged in the door-shaped frames, and the other end of the vehicle rail is arranged in the conveying device. The other end of the vehicle rail is arranged outside the door-shaped frame, the discharging vehicle is arranged on the vehicle rail in a sliding mode, the discharging vehicle is provided with a first position and a second position, the discharging vehicle moves into the door-shaped frame at the first position, the two adsorption hands alternately take and place materials on the discharging vehicle onto a conveying belt of the conveying device, and the discharging vehicle moves out of the door-shaped frame at the second position. The feeding trolley is used for supplementing materials to the feeding trolley. According to the feeding device, the two discharging devices alternately feed materials through the conveying device, and the two taking devices alternately feed the materials for the discharging devices, so that the discharging speed of the feeding device is greatly increased, the use requirement of a stamping production line is met, the overall production speed is increased, and the production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a feeding device of stamping production line. BACKGROUND

[0002] In traditional stamping production, one worker feeds one stamping device to complete the stamping production process of the material. The labor is more mechanical, which leads to the workers being easily tired and causing accidents. Moreover, the feeding is carried out by manual work, especially when the material needs to be continuously stamped by multiple stamping devices, the workers are difficult to efficiently cooperate, and the production efficiency is seriously limited. The material transfer is completed by the carrying machinery between the multiple stamping devices, and the production rhythm and speed are obviously improved. However, the feeding speed to the stamping device cannot meet the stamping speed of the stamping process. SUMMARY

[0003] The utility model aims at providing a feeding device of stamping production line which improves the feeding efficiency.

[0004] The utility model is realized in this way.

[0005] A feeding device of stamping production line, including conveying device, conveying device front end both sides are equipped with door type frame and feeding device respectively, two door type frames are equipped with two erecting on the feeding device front end on the material feeding device, the material feeding device includes the trolley and the material feeding car, the trolley one end is placed in the door type frame, the trolley other end is placed in the door type frame, the material feeding car is slidably arranged on the trolley, the material feeding car has first position and second position,

[0006] The first position, the material feeding car moves to the door type frame, two adsorption hands alternately take and place the material on the material feeding car to the conveying belt of conveying device,

[0007] The second position, the material feeding car moves to the door type frame outside, is used to supplement the material on the material feeding car.

[0008] The utility model alternately feeds the conveying device through two material feeding devices, and cooperates two material taking devices to alternately feed the material feeding device, which greatly improves the feeding speed of the feeding device, meets the use demand of the stamping production line, speeds up the overall production speed and improves the production efficiency.

[0009] Further, the two feeding devices are symmetrically arranged front and back, the feeding device comprises a fixed frame, a horizontal rack, a horizontal sliding seat, a vertical sliding seat, a vertical rack, a horizontal driving mechanism and a vertical driving mechanism, first guide rails are arranged on the opposite side of the two fixed frames along the length direction, the horizontal sliding seat is slidably arranged on the first guide rails through a first sliding seat, the horizontal rack is arranged on the fixed frame and is arranged in parallel with the first guide rails, the horizontal driving mechanism and the vertical driving mechanism are both fixed on the horizontal sliding seat, the output gear of the horizontal driving mechanism is in meshing transmission with the horizontal rack, the horizontal sliding seat is provided with an installation slot with the top surface and the bottom surface being open, a second sliding seat is fixed on the side surface of the installation slot, the vertical sliding seat is provided with a second guide rail along the height direction, the horizontal sliding seat is slidably arranged in the installation slot through the second sliding seat and the second guide rail, the adsorption hand is arranged on the bottom of the vertical sliding seat, the vertical rack is arranged on the vertical sliding seat and is arranged along the height direction of the vertical sliding seat, and the output gear of the vertical driving mechanism extends into the installation slot and is in meshing transmission with the vertical rack.

[0010] The feeding device is flexible in movement and convenient in material taking.

[0011] The horizontal driving mechanism and the vertical driving mechanism both comprise a servo motor, a speed reducer and the output gear, the motor and the speed reducer are in transmission connection at the input end, and the output gear and the speed reducer are in transmission connection at the output end.

[0012] The horizontal driving mechanism and the vertical driving mechanism are simple in structure and easy to implement.

[0013] The vertical sliding seat is provided with a passage for the adsorption hand to pass through along the height direction, the two opposite sides of the vertical sliding seat are respectively provided with the second guide rails, the side of the vertical sliding seat away from the fixed frame is provided with the vertical rack, the top of the vertical sliding seat is provided with an upper limiting block, the top of the second guide rail and the vertical rack is respectively in abutment with the corresponding upper limiting block, the bottom of the vertical sliding seat is provided with a lower limiting block, and the bottom of the second guide rail and the vertical rack is respectively in abutment with the corresponding lower limiting block.

[0014] The upper limiting block and the lower limiting block limit the positions of the second guide rail and the vertical rack.

[0015] The feeding trolley comprises a trolley body, the bottom of the trolley body is provided with a trolley wheel in sliding connection with a trolley rail, the trolley body is provided with a brake feeding motor for driving the trolley wheel to rotate, the top surface of the trolley body is provided with a magnetic force material separating device for fixing materials, and the front and rear sides of the trolley body are both provided with a position detection sensor for detecting whether the feeding trolley is in the first position or the second position.

[0016] The feeding trolley is simple in structure and stable and reliable in movement.

[0017] The conveying device comprises a conveying frame, a conveying motor, driving transmission wheels, driven transmission wheels and the conveying belts, the front end of the conveying frame is arranged between two door-shaped frames, the two driven transmission wheels are synchronously arranged at the front end of the conveying frame, the rear end of the conveying frame extends out of the door-shaped frame, the two driving transmission wheels are synchronously arranged at the rear end of the conveying frame, the driving transmission wheels and the driven transmission wheels on the same side are connected by the conveying belts, the conveying motor is fixed at the rear end of the conveying frame and drives the driving transmission wheels to rotate through a transmission device, and an adjustable stop mechanism for detecting the arrival of materials is arranged between the two conveying belts at the rear end of the conveying frame.

[0018] The conveying device has a simple structure, the adjustable stop mechanism can conveniently adjust the stop position of the materials, and subsequent carrying is facilitated.

[0019] The adjustable stop mechanism comprises a mounting seat fixed on the conveying frame, a first screw nut pair, a first hand wheel, a stop block, guide columns and a pair of detection sensors, the two guide columns are fixed on the mounting seat and are arranged in parallel with the first screw nut pair, the first screw nut pair is arranged on the two guide column supports along the length direction of the conveying frame, the stop block is slidably sleeved on the two guide columns at the bottom, the top of the stop block extends upward and is higher than the top surface of the conveying belt, the pair of detection sensors are arranged on the front end surface of the stop block, and the first hand wheel drives the stop block to slide on the guide columns through the first screw nut pair.

[0020] The adjustable stop mechanism is stable and reliable in operation, convenient and simple to adjust, and can detect whether the materials arrive.

[0021] The adjustable limiting mechanism is arranged on the outer side of the two conveying belts, and is used for limiting the positions of the materials on the left and right sides.

[0022] The adjustable limiting mechanism avoids displacement of the materials on the two conveying belts and guides the materials to be aligned.

[0023] The adjustable limiting mechanism comprises a fixed seat, first and second adjusting sliding blocks, second and third screw nut pairs, a second hand wheel, a third hand wheel and a transmission device, the fixed seat is arranged on the conveying frame along the length direction perpendicular to the conveying belt, the first and second adjusting sliding blocks slide on the same axis along the length direction of the fixed seat, the second and third screw nut pairs are coaxially arranged on the fixed seat along the length direction of the fixed seat, the second hand wheel is arranged on one side of the conveying frame and drives the first adjusting sliding block to slide on the fixed seat through the second screw nut pair, the third hand wheel is arranged on the same side of the conveying frame and drives the second adjusting sliding block to slide on the fixed seat through the transmission device and the second screw nut pair, the first and second adjusting sliding blocks are symmetrically arranged on the left and right sides, the top surfaces of the first and second adjusting sliding blocks are fixed with limiting plates, the top of the limiting plate is higher than the top surface of the conveying belt, and the two limiting plates are respectively arranged on the outer sides of the two conveying belts.

[0024] The adjustable limiting mechanism is stable and reliable in operation, and is convenient and simple to adjust.

[0025] The utility model discloses a two material feeding devices alternate feeding device, and two material taking devices alternate material feeding device is material feeding device for the material feeding device, greatly improves the material feeding speed of feeding device, satisfies the use demand of stamping production line, and the whole production speed is accelerated, and the production efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is the structure schematic diagram of example one.

[0027] Figure 2 It is the exploded structure schematic diagram of example one.

[0028] Figure 3 It is the exploded structure schematic diagram of material feeding device in example one.

[0029] Figure 4 It is the exploded structure schematic diagram of material feeding device in example one.

[0030] Figure 5 It is the structure schematic diagram of conveying device in example one.

[0031] Figure 6 It is the structure schematic diagram of adjustable limiting mechanism in example one.

[0032] Figure 7 It is the structure schematic diagram of adjustable limiting mechanism in example one. DETAILED DESCRIPTION

[0033] The utility model will be further described in connection with the drawings and examples.

[0034] Example one, refer to Figures 1-7 As shown in the figure, a kind of material feeding device of stamping production line, including conveying device 1, door type frame 10, material feeding device 2 and material feeding device 3.

[0035] Two door type frames 10 are respectively arranged in the two sides of conveying device 1 front end.Two material feeding devices 3 are respectively erected on two door type frames 10, i.e material feeding device 3 straddles conveying device 1 front end upper side.Two material feeding devices 2 are respectively arranged in the two sides of conveying device 1 front end.

[0036] The feeding device 2 comprises a track 21 and a feeding trolley 22. One end of the track 21 is arranged in the portal frame 10, and the other end of the track 21 is arranged outside the portal frame 10. The feeding trolley 22 is slidingly arranged on the track 21 and has a first position and a second position. In the first position, the feeding trolley 22 moves into the portal frame 10. In the second position, the feeding trolley 22 moves outside the portal frame 10. The feeding trolley 22 comprises a trolley body 23, the bottom of the trolley body 23 is provided with wheels 24 slidingly connected with the track 21, the trolley body 23 is internally provided with a feeding motor 25 with a brake for driving the wheels 24 to rotate, the top surface of the trolley body 23 is provided with a magnetic force separating device 26 for fixing materials, and the front and rear sides of the trolley body 23 are both provided with a position detection sensor 27 for detecting whether the feeding trolley 22 is in the first position or the second position. Preferably, the two feeding devices 2 are symmetrically arranged left and right. The magnetic force separating device 26 is a prior art.

[0037] The feeding device 3 comprises a fixed frame 31, a horizontal rack 32, a horizontal sliding seat 33, a vertical sliding seat 34, a vertical rack 35, a horizontal driving mechanism 36 and a vertical driving mechanism 37. The first guide rails 311 are arranged on one side of the two fixed frames 31 along the length direction, the horizontal sliding seat 33 is slidingly arranged on the first guide rails 311 through the first sliding seat 331, the horizontal rack 32 is arranged on the fixed frame 31 and is arranged in parallel with the first guide rails 311, the horizontal driving mechanism 36 and the vertical driving mechanism 37 are both fixed on the horizontal sliding seat 33, the output gear 42 of the horizontal driving mechanism 36 is in meshing transmission with the horizontal rack 32, the horizontal sliding seat 33 is provided with an installation slot 332 with the top surface and the bottom surface being open, the second sliding seat 333 is fixed on the side of the installation slot 332, the vertical sliding seat 34 is provided with the second guide rails 341 along the height direction, the horizontal sliding seat 33 slides in the installation slot 332 through the second sliding seat 333 and the second guide rails 341, the vertical sliding seat 34 is provided with the suction hand 30 at the bottom, the vertical rack 35 is arranged on the vertical sliding seat 34 and is arranged along the height direction of the vertical sliding seat 34, and the output gear of the vertical driving mechanism 37 extends into the installation slot 332 and is in meshing transmission with the vertical rack 35. The vertical sliding seat 34 is provided with the channel 342 for the air path of the suction hand 30 along the height direction, the two opposite sides of the vertical sliding seat 34 are respectively provided with the second guide rails 341, the side of the vertical sliding seat 34 away from the fixed frame 31 is provided with the vertical rack 35, the top of the vertical sliding seat 34 is provided with the upper limit block 38, the top of the second guide rails 341 and the vertical rack 35 is respectively abutted with the corresponding upper limit block 38, the bottom of the vertical sliding seat 34 is provided with the lower limit block 39, and the bottom of the second guide rails 341 and the vertical rack 35 is respectively abutted with the corresponding lower limit block 39.

[0038] Preferably, two feeding devices 3 are arranged symmetrically in front and back. The suction hand 30 comprises a support and a suction cup fixed on the support. The horizontal driving mechanism 36 and the vertical driving mechanism 37 each comprise a servo motor 4, a reducer 41 and the output gear 42, the motor and the reducer 41 are drivingly connected at the input end, and the output gear 42 and the reducer 41 are drivingly connected at the output end.

[0039] The conveying device 1 comprises a conveying frame 11, a conveying motor 12, driving wheels 13, driven wheels 14 and conveying belts (not shown in the figure). The front end of the conveying frame 11 is arranged between the two door-shaped frames 10, the two driven wheels 14 are synchronously arranged at the front end of the conveying frame 11, the rear end of the conveying frame 11 extends out of the door-shaped frame 10, the two driving wheels 13 are synchronously arranged at the rear end of the conveying frame 11, the driving wheels 13 and the driven wheels 14 on the same side are drivingly connected through the conveying belts, and the conveying motor 12 is fixed at the rear end of the conveying frame 11 and drives the driving wheels 13 to rotate through a transmission device 69. The adjustable stop mechanism 5 for detecting the material in place is arranged between the two conveying belts at the rear end of the conveying frame 11. The adjustable limiting mechanism 6 is arranged outside the two conveying belts on the conveying frame 11, and is used to limit the position of the material on the left and right sides.

[0040] The adjustable stop mechanism 5 comprises a mounting seat 51 fixed on the conveying frame 11, a first screw-nut pair 52, a first hand wheel 53, a stop block 54, guide columns 55 and a pair of detection sensors 56. The two guide columns 55 are fixed on the mounting seat 51 and are arranged in parallel with the first screw-nut pair 52, the first screw-nut pair 52 is arranged along the length direction of the conveying frame 11 on the support of the two guide columns 55, the stop block 54 is slidably sleeved on the two guide columns 55 at the bottom, the stop block 54 extends upward above the top surface of the conveying belt at the top, the pair of detection sensors 56 are arranged on the front end surface of the stop block 54, and the first hand wheel 53 drives the stop block 54 to slide on the guide columns 55 through the first screw-nut pair 52.

[0041] The adjustable limiting mechanism 6 comprises a fixed seat 61, a first adjusting sliding block 62, a second adjusting sliding block 63, a second screw nut pair 64, a third screw nut pair 65, a second hand wheel 67, a third hand wheel 68 and a transmission device 69. The fixed seat 61 is arranged on the conveying frame 11 along the length direction perpendicular to the conveying belt direction, the first adjusting sliding block 62 and the second adjusting sliding block 63 slide along the same axis along the length direction of the fixed seat 61, the second screw nut pair 64 and the third screw nut pair 65 are coaxially arranged on the fixed seat 61 along the length direction of the fixed seat 61, the second hand wheel 67 is arranged on one side of the conveying frame 11 and drives the first adjusting sliding block 62 to slide on the fixed seat 61 through the second screw nut pair 64, the third hand wheel 68 is arranged on the same side of the conveying frame 11 and drives the second adjusting sliding block 63 to slide on the fixed seat 61 through the transmission device 69 and the second screw nut pair 64, the first adjusting sliding block 62 and the second adjusting sliding block 63 are symmetrically arranged, the top surfaces of the first adjusting sliding block 62 and the second adjusting sliding block 63 are fixed with limiting plates 60, the top of the limiting plate 60 is higher than the top surface of the conveying belt, the two limiting plates 60 are respectively located on the outer sides of the two conveying belts, the first adjusting sliding block 62 and the second adjusting sliding block 63 respectively drive the corresponding limiting plates 60 to move, so as to adjust the distance between the material and the edge of the conveying belt. The transmission device 69 comprises a gear set and a combination of gears and chains.

[0042] Working principle, the material car 22 moves to the second position, the workers place the material in the magnetic force separator 26 of the material car 22 through the forklift, the material car 22 moves to the first position, that is, the material is transported into the two door type frames 10, the adsorption hands 30 of the two material placing devices 3 alternately take out the material from the material car 22 and place the material on the conveying belt of the conveying device 1. The material moves on the conveying belt from the front end to the rear end of the conveying device 1, the material adjusts the left and right positions through the two limiting plates 60, and stops until abutting against the stop block 54, the material blocks the light barrier detection sensor 56, and the carrying device of the stamping production line can take away the material. In this process, the workers place the material in the magnetic force separator 26 of another material car 22 through the forklift, so as to avoid interruption of the material feeding process.

[0043] In the utility model, the conveying device 1, the feeding device 2 and the material placing device 3 are controlled to operate by the program of the control device, according to different programs, one feeding device 2 can also realize taking and placing the material of one material placing device 3 and two feeding devices 2 alternately to the conveying device 1.

[0044] In the utility model, the terms such as first, second and the like are not used to represent any order, quantity or importance, but are only used for distinction.

[0045] In the utility model, the terms such as one and the like are not used to represent quantity limitation, but represent the existence of at least one mentioned object.

[0046] As the terms indicating the direction or position used in the present utility model: top, bottom, side, longitudinal, transverse, middle, center, outer, inner, horizontal, vertical, left, right, upper, lower, etc. means to reflect the relative position, not the absolute position.

[0047] As the terms used in the present utility model: approximately, overall, approximately, similar, etc. is to indicate the limiting language that there are characteristics but allow certain deviations. The amount allowed to deviate can vary depending on the specific context.

Claims

1. A feeding device for a press line, comprising a conveying device (1), characterized in that, The conveying device (1) is provided with door-shaped frames (10) and feeding devices (2) at both sides of the front end. Two discharging devices (3) are arranged on the door-shaped frames (10) at the front end of the conveying device (1). The discharging device (3) comprises suction hands (30) moving in the vertical and horizontal directions. The feeding device (2) comprises a track (21) and a discharging trolley (22). One end of the track (21) is arranged in the door-shaped frame (10), and the other end of the track (21) is arranged outside the door-shaped frame (10). The discharging trolley (22) is slidably arranged on the track (21). The discharging trolley (22) has a first position and a second position. In the first position, the discharging trolley (22) moves into the door-shaped frame (10), and the two suction hands (30) alternately take and place the materials on the discharging trolley (22) onto the conveying belt of the conveying device (1). In the second position, the discharging trolley (22) moves outside the door-shaped frame (10) to supplement the materials on the discharging trolley (22).

2. The feeding device of a press line according to claim 1, characterized in that, The two discharging devices (3) are arranged symmetrically in front and back. The discharging device (3) comprises a fixed frame (31), a horizontal rack (32), a horizontal sliding seat (33), a vertical sliding seat (34), a vertical rack (35), a horizontal driving mechanism (36), and a vertical driving mechanism (37). First guide rails (311) are arranged on the length direction of the opposite side of the two fixed frames (31). The horizontal sliding seat (33) is slidably arranged on the first guide rails (311) through first sliding seats (331). The horizontal rack (32) is arranged on the fixed frame (31) and is arranged in parallel with the first guide rails (311). The horizontal driving mechanism (36) and the vertical driving mechanism are both fixed on the horizontal sliding seat (33). The output gear (42) of the output end of the horizontal driving mechanism (36) is in mesh transmission with the horizontal rack (32). The horizontal sliding seat (33) is provided with an installation slot (332) with open top surface and bottom surface. The second sliding seat (333) is fixed on the side surface of the installation slot (332). The vertical sliding seat (34) is provided with second guide rails (341) in the height direction. The horizontal sliding seat (33) is slidably arranged in the installation slot (332) through the second sliding seat (333) and the second guide rails (341). The suction hands (30) are arranged on the bottom of the vertical sliding seat (34). The vertical rack (35) is arranged on the vertical sliding seat (34) and is arranged in the height direction of the vertical sliding seat (34). The output gear of the output end of the vertical driving mechanism (37) extends into the installation slot (332) and is in mesh transmission with the vertical rack (35).

3. The feeding device of a press line according to claim 2, characterized in that, The horizontal driving mechanism (36) and the vertical driving mechanism (37) both comprise a servo motor (4), a speed reducer (41), and the output gear (42). The motor and the speed reducer (41) are in transmission connection at the input end. The output gear (42) and the speed reducer (41) are in transmission connection at the output end.

4. The feeding device of a press line according to claim 2, characterized in that the vertical The vertical sliding seat (34) is provided with a passage (342) for the air path of the suction hand (30) in the height direction, the two opposite sides of the vertical sliding seat (34) are respectively provided with the second guide rail (341), the side of the vertical sliding seat (34) away from the fixed frame (31) is provided with the vertical rack (35), the top of the vertical sliding seat (34) is provided with an upper limit block (38), the top of the second guide rail (341) and the vertical rack (35) is respectively abutted with the corresponding upper limit block (38), the bottom of the vertical sliding seat (34) is provided with a lower limit block (39), the bottom of the second guide rail (341) and the vertical rack (35) is respectively abutted with the corresponding lower limit block (39).

5. The feeding device of a press line according to claim 1, characterized in that, The discharging trolley (22) comprises a trolley body (23), the bottom of the trolley body (23) is provided with a trolley wheel (24) in sliding connection with the trolley rail (21), the trolley body (23) is provided with a brake feeding motor (25) for driving the trolley wheel (24) to rotate, the top surface of the trolley body (23) is provided with a magnetic force material separating device (26) for fixing material, and the front and rear sides of the trolley body (23) are both provided with a position detection sensor (27) for detecting the discharging trolley (22) in the first position or the second position.

6. The feeding device of a press line according to claim 1, characterized in that, The conveying device (1) comprises a conveying frame (11), a conveying motor (12), a driving transmission wheel (13), a driven transmission wheel (14) and the conveying belt, the front end of the conveying frame (11) is arranged between the two door-shaped frames (10), the two driven transmission wheels (14) are synchronously arranged at the front end of the conveying frame (11), the rear end of the conveying frame (11) extends out of the door-shaped frame (10), the two driving transmission wheels (13) are synchronously arranged at the rear end of the conveying frame (11), the driving transmission wheel (13) and the driven transmission wheel (14) on the same side are connected through the conveying belt, the conveying motor (12) is fixed at the rear end of the conveying frame (11) and drives the driving transmission wheel (13) to rotate through a transmission device (69), and the rear end of the conveying frame (11) is provided between the two conveying belts with an adjustable stop mechanism (5) for detecting the material position.

7. The feeding device of a press line according to claim 6, characterized in that the adjustment The stop mechanism (5) comprises a mounting seat (51) fixed on the conveying frame (11), a first screw nut pair (52), a first hand wheel (53), a stop block (54), guide columns (55) and a pair of detection sensors (56), the two guide columns (55) are fixed on the mounting seat (51), the two guide columns (55) are arranged in parallel with the first screw nut pair (52), the first screw nut pair (52) is arranged on the two guide column (55) supports along the length direction of the conveying frame (11), the stop block (54) is slidably sleeved on the two guide columns (55) at the bottom, the stop block (54) extends upward above the top surface of the conveying belt at the top, the pair of detection sensors (56) are arranged on the front end surface of the stop block (54), and the first hand wheel (53) drives the stop block (54) to slide on the guide column (55) through the first screw nut pair (52).

8. The feeding device of a press line according to claim 6, characterized in that The conveying frame (11) is provided with an adjustable limiting mechanism (6) outside the two conveying belts, and the adjustable limiting mechanism (6) is used for limiting the positions of the left and right sides of the material.

9. The feeding device of a press line according to claim 8, characterized in that the adjustment The limiting mechanism (6) comprises a fixed seat (61), a first adjusting sliding block (62), a second adjusting sliding block (63), a second screw nut pair (64), a third screw nut pair (65), a second hand wheel (67), a third hand wheel (68) and a transmission device (69), the fixed seat (61) is arranged on the conveying frame (11) along the length direction perpendicular to the conveying belt direction, the first adjusting sliding block (62) and the second adjusting sliding block (63) slide along the length direction of the fixed seat (61) on the same axis, the second screw nut pair (64) and the third screw nut pair (65) are coaxially arranged on the fixed seat (61) along the length direction of the fixed seat (61) at intervals, the second hand wheel (67) is arranged on one side of the conveying frame (11) and drives the first adjusting sliding block (62) to slide on the fixed seat (61) through the second screw nut pair (64), the third hand wheel (68) and the second hand wheel (67) are arranged on the same side of the conveying frame (11), the third hand wheel (68) drives the second adjusting sliding block (63) to slide on the fixed seat (61) through the transmission device (69) and the second screw nut pair (64), the first adjusting sliding block (62) and the second adjusting sliding block (63) are symmetrically arranged, the top surfaces of the first adjusting sliding block (62) and the second adjusting sliding block (63) are fixed with limiting plates (60), the top of the limiting plate (60) is higher than the top surface of the conveying belt, and the two limiting plates (60) are respectively located on the outer sides of the two conveying belts.

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