Food packaging bag storage transfer device

Abstract

The present invention discloses a food packaging bag storage transfer device, including a conveyor frame and a plurality of turnover boxes; the conveyor frame is provided with a plurality of conveyor belts for transmission, and a belt driving assembly is also installed on the conveyor frame; a lifting driving device is installed on the conveyor frame, and the output end of the lifting driving device is connected to a lifting positioning frame, and the lifting positioning frame has a plurality of lifting positioning rods; the lifting positioning rod is also connected to a positioning nozzle located beside the lifting positioning rod through a mounting seat; the turnover box includes a box body, and a plurality of spaced partitions are arranged in the box body, and the plurality of partitions divide the box body into a plurality of accommodating chambers, and a ventilation structure capable of cooperating with the positioning nozzle is arranged at the bottom end of each accommodating chamber. The present invention can realize the positioning and receiving work of the turnover box and the conveying work of the turnover box through the cooperation of the lifting positioning rod and the conveyor belt, so that the workload of the operator can be effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of packaging and bag making, in particular to a food packaging bag storage and transfer device. Background Art

[0002] Food packaging generally uses plastic packaging bags as the main product. In the current packaging bag production, the packaging bag making machine can punch and cut the semi-finished products. After cutting, the subsequent packaging work can be carried out. According to the setting of the printing layout, 3 to 4 packaging bags can be output at the same time after cutting. At present, the output end of the packaging bag making machine is mostly connected to a storage box that can hold packaging bags. When packaging, 200 bags are generally packed as a base. Therefore, when a certain number of packaging bags are piled up in the storage box, the transfer work is carried out manually and a new empty storage box is placed at the output end of the packaging bag making machine. It can be seen that this will not only increase the workload of the operators, but also reduce production efficiency and affect production quality. In addition, most of the existing storage boxes are a box body. During the storage process, the packaging bags are prone to scattering and falling off, which will affect the subsequent packaging work. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned problems of the prior art and provide a food packaging bag storage and transfer device. Through the cooperation of the lifting positioning rod and the conveyor belt, it can realize the positioning and material collection work of the turnover box and the conveying work of the turnover box. In this way, it can effectively reduce the workload of the operator and improve production efficiency and quality.

[0004] The purpose of the present invention is mainly achieved through the following technical solutions:

[0005] A food packaging bag storage and transfer device, including a conveyor rack and a number of turnover boxes;

[0006] The conveyor frame is provided with a plurality of conveyor belts arranged at intervals, and a belt drive assembly for driving the conveyor belts is also installed on the conveyor frame;

[0007] A lifting drive device is installed on the conveying frame, and the output end of the lifting drive device is connected to a lifting positioning frame, which has a plurality of lifting positioning rods staggered with the conveying belt. The lifting drive device acts on the lifting positioning frame so that: the lifting positioning rods can move up and down relative to the conveying frame;

[0008] The lifting and positioning rod is also connected to a positioning nozzle located beside the lifting and positioning rod through a mounting seat;

[0009] The turnover box includes a box body, in which a plurality of partitions are arranged at intervals. The plurality of partitions divide the box body into a plurality of accommodating cavities corresponding to the number of positioning suction nozzles. The accommodating cavities run through the top and rear ends of the box body. A ventilation structure that can cooperate with the positioning suction nozzle is provided at the bottom end of each accommodating cavity.

[0010] In the present invention, the partition can be arranged to divide the box body into a plurality of independent accommodating chambers, so as to facilitate receiving the packaging bags outputted from the corresponding positions. When in use, the conveying frame is located below the output end of the packaging bag making machine, and the turnover box is placed in the specific position corresponding to the lifting and positioning rod. At this time, the positioning nozzle can just face the ventilation structure, and then the lifting drive device is started to drive the lifting and positioning frame to move upward. At this time, each packaging bag outputted from the output end of the packaging bag making machine can enter the corresponding accommodating area and be stacked from bottom to top. In this process, the lifting drive device is started again to drive the lifting and positioning frame to move downward step by step until the turnover box contacts the conveyor belt. At this time, a specific number of packaging bags are also loaded in the turnover box, and the belt drive assembly is started to drive the conveyor belt to convey, so as to convey the turnover box loaded with packaging bags to the next process for subsequent packaging work.

[0011] Among them, the positioning suction nozzle is connected to a gas generator. During operation, the gas generator is started to generate negative pressure in the positioning suction nozzle. Through the cooperation of the positioning suction nozzle and the ventilation structure, it can be used to position the turnover box to prevent it from accidental movement; it can also be used to adsorb the packaging bag to prevent the packaging bag from moving in the containing area.

[0012] Furthermore, the ventilation structure includes a plurality of ventilation holes arranged at intervals, and the ventilation holes are communicated with the accommodating cavity.

[0013] In this way, the packaging bag can be supported and the suction nozzle can be easily applied to the packaging bag.

[0014] Furthermore, the bottom end of the box body is provided with a positioning groove which can be inserted and matched with the top end of the lifting positioning rod.

[0015] In the present invention, the positioning groove and the lifting positioning rod cooperate to improve the stability of the box body positioning.

[0016] Furthermore, the outer side surface of the lifting and positioning rod at the endmost part among the plurality of lifting and positioning rods is also connected to a limiting frame.

[0017] In the present invention, the setting of the limit frame can realize the rapid positioning of the turnover box.

[0018] In order to improve the positioning ability of the lifting and positioning rod on the turnover box, further, the top end of the lifting and positioning rod is connected with an anti-slip layer.

[0019] Furthermore, an electrostatic support frame is installed at the input end of the conveying frame, and an electrostatic eliminator located above the lifting and positioning frame is installed on the electrostatic support frame.

[0020] The static eliminator can eliminate static electricity accumulated on the surface of plastic packaging bags, which is more conducive to neatly stacking the packaging bags in the storage area.

[0021] Furthermore, an anti-slip support frame is installed on the conveying frame, and an anti-slip drive device is installed on the anti-slip support frame. The output end of the anti-slip drive device is connected to the anti-slip structure that can act on the accommodating cavity. The anti-slip drive device acts on the anti-slip structure, so that: the anti-slip structure can move forward and backward and up and down relative to the conveying frame.

[0022] When the conveyor belt drives the turnover box to move in the initial stage, the packaging bags stacked on the turnover box are very likely to slide down due to inertia. For this reason, the present invention is designed with an anti-slip structure, which can apply downward pressure to the packaging bag during the relative movement between the turnover box and the conveyor belt, and then through the setting of the anti-slip driving device, the anti-slip structure moves forward with the movement of the turnover box to assist the turnover box to move stably.

[0023] Furthermore, the anti-slip structure comprises an anti-slip connecting frame, on which a plurality of anti-slip plates are arranged, and an anti-slip driving device acts on the anti-slip connecting frame, so that the anti-slip plates can move forward and backward and up and down relative to the conveying frame.

[0024] In the present invention, the anti-slip plate can be directly attached to the packaging bag to press it down.

[0025] Furthermore, the anti-slip structure includes an anti-slip block with a cavity, the anti-slip block is provided with an air inlet, and the bottom end of the anti-slip block is provided with several groups of down-pressing hole assemblies that can respectively cooperate with several accommodating cavities, and the down-pressing hole assemblies include several down-pressing holes.

[0026] In the present invention, the air inlet is connected to a gas supplier, through which gas can be injected into the anti-dropping block, and then act on the packaging bag to press it down through the downward pressure hole, so that the anti-dropping structure can prevent the packaging bag from being damaged.

[0027] In order to realize the up-down movement and the forward-backward movement of the anti-slip plate, the anti-slip driving device further comprises an anti-slip front and rear driving device and an anti-slip up-down driving device connected to the output end of the anti-slip front and rear driving device;

[0028] The anti-slip front and rear driving device enables the anti-slip connecting frame to move forward and backward relative to the conveying frame;

[0029] The anti-slip up and down driving device enables the anti-slip connecting frame to move up and down relative to the conveying frame.

[0030] In order to facilitate the recovery of the empty turnover box, further, a support seat is provided at the bottom end of the conveying frame, and a recovery channel is opened on the support seat, and the recovery channel runs through the output end of the conveying frame;

[0031] The bottom surface of the recovery channel is arranged in an inclined surface, and the depth of the recovery channel gradually decreases along the conveying direction of the conveying rack.

[0032] When the packaging bags in the turnover box have been taken out for packaging, the turnover box can be placed in the recycling channel so that it moves to the output end of the conveyor rack under the action of gravity.

[0033] In order to realize the driving of the transmission belt by the belt driving assembly, further, the belt driving assembly includes an active transmission shaft, a driven transmission shaft and a belt driving device for driving the active transmission shaft to rotate;

[0034] The driving transmission shaft and the driven transmission shaft are rotatably arranged at the output end and the input end of the conveying frame respectively;

[0035] A plurality of driving pulleys arranged at intervals are installed on the driving transmission shaft;

[0036] A plurality of driven pulleys corresponding to a plurality of driving pulleys are installed on the driven transmission shaft;

[0037] The transmission belt is sleeved on the corresponding driving pulley and driven pulley.

[0038] The present invention has the following beneficial effects:

[0039] 1. The present invention can realize both the positioning and material receiving work of the turnover box and the conveying work of the turnover box through the cooperation of the lifting positioning rod and the conveying belt, thus effectively reducing the workload of the operator.

[0040] 2. In the present invention, the partitions can be arranged to divide the box body into a plurality of independent accommodating chambers, so that it is convenient to receive and stack the packaging bags output from the corresponding positions.

[0041] 3. The present invention can realize the up and down movement of the turnover box by setting the jacking drive device and the jacking positioning rod, so as to facilitate the stable material collection and stacking work; wherein, through the setting of the positioning suction nozzle, it can be used to assist in positioning the turnover box, and can also be used to absorb the packaging bag to improve the neatness of the packaging bag stacking.

[0042] 4. The static eliminator can eliminate the static electricity accumulated on the surface of plastic packaging bags, which is more conducive to the neat stacking of packaging bags in the storage area.

[0043] 5. In the initial stage when the conveyor belt drives the turnover box to move, the packaging bags stacked on the turnover box are very likely to slide down due to inertia. For this reason, the present invention is designed with an anti-slip structure, which can press down on the packaging bags during the stage of relative movement between the turnover box and the conveyor belt, and then through the setting of the anti-slip driving device, the anti-slip structure moves forward with the movement of the turnover box to assist the turnover box to move stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present invention, the following is a brief description of the drawings required to describe the embodiments of the present invention. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on the following drawings without creative work.

[0045] Figure 1 It is a structural schematic diagram of a specific embodiment of the food packaging bag storage and transfer device of the present invention;

[0046] Figure 2 It is a structural schematic diagram of a specific embodiment of the food packaging bag storage and transfer device of the present invention;

[0047] Figure 3 It is a structural schematic diagram of a specific embodiment of a conveying rack in the food packaging bag storage and transfer device of the present invention when in use;

[0048] Figure 4 It is a structural schematic diagram of a specific embodiment of the lifting and positioning frame in the food packaging bag storage and transfer device of the present invention;

[0049] Figure 5 It is a structural schematic diagram of a specific embodiment of a box body in the food packaging bag storage and transfer device of the present invention;

[0050] Figure 6 It is a structural schematic diagram of a specific embodiment of the anti-detachment connecting frame in the food packaging bag storage and transfer device of the present invention;

[0051] Figure 7 It is a structural schematic diagram of a specific embodiment of the anti-falling block in the food packaging bag storage and transfer device of the present invention;

[0052] Figure 8 It is a structural schematic diagram of a specific embodiment of the anti-falling block in the food packaging bag storage and transfer device of the present invention;

[0053] Fig. 9 The present invention is a schematic structural diagram of a specific embodiment of an anti-dropping block in the food packaging bag storage and transfer device of the present invention.

[0054] Among them, the names of the parts corresponding to the figure numbers are as follows: 1. Conveyor frame, 2. Conveyor belt, 3. Lifting drive device, 4. Lifting positioning frame, 5. Lifting positioning rod, 6. Mounting seat, 7. Positioning nozzle, 8. Limiting frame, 9. Anti-slip layer, 10. Electrostatic support frame, 11. Static eliminator, 12. Anti-slip support frame, 13. Anti-slip connecting frame, 14. Anti-slip plate, 15. Anti-slip front and rear drive device, 16. Anti-slip upper and lower drive device, 17. Support seat, 1 8. Recovery channel, 19. Active transmission shaft, 20. Driven transmission shaft, 21. Active pulley, 22. Driven pulley, 23. Anti-damage layer, 24. Roller, 25. Box body, 26. Partition, 27. Accommodating chamber, 28. Vent, 29. Positioning groove, 30. Anti-slip block, 31. Air inlet, 32. Down-pressure hole, 33. Support plate, 34. Injection head, 35. Belt drive motor, 36. Active wheel, 37. Driven wheel, 38. Conveyor belt. DETAILED DESCRIPTION

[0055] In order to make those skilled in the art better understand the present invention, the technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the embodiments described below are only a part of the embodiments of the present invention, not all. Based on the embodiments recorded in the present invention, all other embodiments obtained by those skilled in the art without paying creative work are within the scope of protection of the present invention.

[0056] Example 1

[0057] like Figures 1 to 9 As shown, the food packaging bag storage transfer device includes a conveyor rack 1 and a plurality of turnover boxes;

[0058] The conveyor frame 1 is provided with a plurality of conveyor belts 2 arranged at intervals, and the conveyor frame 1 is also provided with a belt driving assembly for driving the conveyor belts 2;

[0059] A lifting drive device 3 is installed on the conveying frame 1, and an output end of the lifting drive device 3 is connected to a lifting positioning frame 4, and the lifting positioning frame 4 has a plurality of lifting positioning rods 5 staggered with the conveying belt 2. The lifting drive device 3 acts on the lifting positioning frame 4, so that: the lifting positioning rods 5 can move up and down relative to the conveying frame 1;

[0060] The lifting and positioning rod 5 is also connected to a positioning nozzle 7 located beside the lifting and positioning rod 5 through a mounting seat 6;

[0061] The turnover box includes a box body 25, in which a plurality of partitions 26 are arranged at intervals. The plurality of partitions 26 divide the box body 25 into a plurality of accommodating cavities 27 corresponding to the number of positioning suction nozzles 7. The accommodating cavities 27 run through the top and rear ends of the box body 25, and a ventilation structure that can cooperate with the positioning suction nozzle 7 is provided at the bottom end of the box body 25 at the position of each accommodating cavity 27.

[0062] In this embodiment, the lifting drive device 3 can be a double-axis cylinder. The number of lifting positioning rods 5 can be adapted to the number of storage areas in the turnover box. In this way, the positioning suction nozzle can correspond to the ventilation structure of each storage cavity. With the conveying direction of the conveyor belt as the front, the storage cavity 27 runs through the top and rear ends of the box body 25. The box body 25 can be made of plastic. In order to increase the support force for the turnover box, the conveyor frame 1 also has a support plate 33 that can support the conveyor belt 2.

[0063] Preferably, the ventilation structure includes a plurality of ventilation holes 28 arranged at intervals, and the ventilation holes 28 are communicated with the accommodating cavity 27 .

[0064] Example 2

[0065] This embodiment makes the following further limitation on the basis of the embodiment 1: the bottom end of the box body 25 is provided with a positioning groove 29 which can be inserted and matched with the top end of the lifting and positioning rod 5.

[0066] The top end surface of the lifting and positioning rod 5 should have a sufficient area so that it can cooperate with the positioning groove 29 to position the turnover box.

[0067] Preferably, the outer side surface of the lifting and positioning rod 5 located at the endmost among the plurality of lifting and positioning rods 5 is also connected to the limiting frame 8 .

[0068] In this embodiment, the limiting frame 8 can be set to be L-shaped, with the conveying direction of the conveyor belt as the front, and the limiting frame 8 can limit the rear and sides of the turnover box.

[0069] Example 3

[0070] This embodiment makes the following further limitation on the basis of the embodiment 1: the top end of the lifting and positioning rod 5 is connected with an anti-slip layer 9 .

[0071] The anti-skid layer 9 can be made of rubber or silicone.

[0072] Example 4

[0073] This embodiment makes the following further limitations on the basis of the embodiment 1: an electrostatic support frame 10 is also installed at the input end of the conveying frame 1, and an electrostatic eliminator 11 located above the lifting and positioning frame 4 is installed on the electrostatic support frame 10.

[0074] The static eliminator 11 can be SL-040.

[0075] Example 5

[0076] This embodiment makes the following further limitations on the basis of Embodiment 1: an anti-slip support frame 12 is also installed on the conveying frame 1, and an anti-slip driving device is installed on the anti-slip support frame 12, and the output end of the anti-slip driving device is connected to an anti-slip structure that can act on the accommodating cavity 27, and the anti-slip driving device acts on the anti-slip structure, so that: the anti-slip structure can move forward and backward and up and down relative to the conveying frame 1.

[0077] Preferably, the anti-slip structure comprises an anti-slip connecting frame 13 , on which are provided a plurality of anti-slip plates 14 , and an anti-slip driving device acts on the anti-slip connecting frame 13 , so that the anti-slip plates 14 can move forward and backward and up and down relative to the conveying frame 1 .

[0078] In this embodiment, the anti-slip support frame 12 can be installed on the electrostatic support frame 10, and the bottom end surface of the anti-slip plate 14 can be provided with an anti-damage layer 23, and the anti-damage layer 23 can be made of rubber or silicone.

[0079] Preferably, the anti-slip structure includes an anti-slip block 30 with a cavity, the anti-slip block 30 is provided with an air inlet 31, and the bottom end of the anti-slip block 30 is provided with several groups of down-pressing hole assemblies which can respectively cooperate with several accommodating cavities 27, and the down-pressing hole assemblies include several down-pressing holes 32.

[0080] In this embodiment, the pressing hole 32 can act on the packaging bag together with the positioning nozzle 7. In order to increase the force of the pressing hole 32 on the packaging bag, a nozzle 34 can be connected to the pressing hole 32.

[0081] Preferably, the anti-slipping driving device comprises an anti-slipping front and rear driving device 15 and an anti-slipping up and down driving device 16 connected to the output end of the anti-slipping front and rear driving device 15;

[0082] The anti-slip front and rear driving device 15 enables the anti-slip connecting frame 13 to move forward and backward relative to the conveying frame 1;

[0083] The anti-slip up and down driving device 16 enables the anti-slip connecting frame 13 to move up and down relative to the conveying frame 1 .

[0084] In this embodiment, the anti-slip front and rear drive device 15 can be a double-shaft cylinder or a slide cylinder. The anti-slip upper and lower drive device 16 can be a double-shaft cylinder or a slide cylinder.

[0085] Example 6

[0086] This embodiment is further limited as follows based on the embodiment 1: a support seat 17 is provided at the bottom end of the conveying frame 1, a recovery channel 18 is provided on the support seat 17, and the recovery channel 18 runs through the output end of the conveying frame 1;

[0087] The bottom surface of the recovery channel 18 is arranged in an inclined surface, and the depth of the recovery channel 18 gradually decreases along the conveying direction of the conveying rack 1 .

[0088] In this embodiment, a plurality of rollers 24 are rotatably disposed in the recovery channel 18 to assist the empty turnover boxes to return to the input end of the conveying rack 1 .

[0089] Preferably, a recovery conveyor belt and a recovery drive assembly for driving the recovery conveyor belt may also be provided in the recovery channel 18 .

[0090] Example 7

[0091] This embodiment is further defined as follows based on the embodiment 1: the belt drive assembly includes a driving transmission shaft 19, a driven transmission shaft 20 and a belt drive device for driving the driving transmission shaft 19 to rotate;

[0092] The driving transmission shaft 19 and the driven transmission shaft 20 are rotatably disposed at the output end and the input end of the conveying frame 1 respectively;

[0093] A plurality of spaced driving pulleys 21 are mounted on the driving transmission shaft 19;

[0094] A plurality of driven pulleys 22 corresponding to a plurality of driving pulleys 21 are mounted on the driven transmission shaft 20;

[0095] The transmission belt 2 is sleeved on the corresponding driving pulley 21 and driven pulley 22 .

[0096] In this embodiment, the belt drive device may include a belt drive motor, a driving wheel connected to the output end of the belt drive motor, a driven wheel sleeved on the driving transmission shaft 19, and a transmission belt sleeved on the driving wheel and the driven wheel.

[0097] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific embodiments of the present invention are limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, other embodiments obtained without departing from the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A food packaging bag storage and transfer device, characterized in that: The invention comprises a conveyor frame (1) and a plurality of turnover boxes; the conveyor frame (1) is provided with a plurality of conveyor belts (2) arranged at intervals for transmission, and the conveyor frame (1) is also provided with a belt driving assembly for driving the conveyor belts (2); A lifting drive device (3) is installed on the conveying frame (1); the output end of the lifting drive device (3) is connected to a lifting positioning frame (4); the lifting positioning frame (4) has a plurality of lifting positioning rods (5) staggered with the conveying belt (2); the lifting drive device (3) acts on the lifting positioning frame (4) so ​​that the lifting positioning rods (5) can move up and down relative to the conveying frame (1); The lifting and positioning rod (5) is also connected to a positioning nozzle (7) located beside the lifting and positioning rod (5) via a mounting seat (6); The turnover box comprises a box body (25), wherein a plurality of partitions (26) are arranged at intervals in the box body (25), wherein the plurality of partitions (26) divide the box body (25) into a plurality of accommodating cavities (27) corresponding to the number of positioning suction nozzles (7), wherein the accommodating cavities (27) penetrate the top and rear ends of the box body (25), and a ventilation structure capable of cooperating with the positioning suction nozzles (7) is arranged at the bottom end of each accommodating cavity (27); The conveying frame (1) is also provided with an anti-slip support frame (12), and an anti-slip driving device is provided on the anti-slip support frame (12). The output end of the anti-slip driving device is connected with an anti-slip structure that can act on the accommodating cavity (27), and the anti-slip driving device acts on the anti-slip structure, so that the anti-slip structure can move forward and backward and up and down relative to the conveying frame (1); The anti-slip structure comprises an anti-slip block (30) having a cavity, the anti-slip block (30) being provided with an air inlet hole (31), and a plurality of groups of down-pressing hole assemblies which can respectively cooperate with a plurality of accommodating cavities (27) are provided at the bottom end of the anti-slip block (30), the down-pressing hole assemblies comprising a plurality of down-pressing holes (32).

2. The food packaging bag storage and transfer device according to claim 1, characterized in that: The ventilation structure comprises a plurality of ventilation holes (28) arranged at intervals, and the ventilation holes (28) are communicated with the accommodating cavity (27).

3. The food packaging bag storage and transfer device according to claim 1, characterized in that: The bottom end of the box body (25) is provided with a positioning groove (29) which can be inserted and matched with the top end of the lifting and positioning rod (5).

4. The food packaging bag storage and transfer device according to claim 1, characterized in that: The outer side surface of the lifting and positioning rod (5) located at the endmost part among the plurality of lifting and positioning rods (5) is also connected to a limiting frame (8).

5. The food packaging bag storage and transfer device according to claim 1, characterized in that: An electrostatic support frame (10) is also installed at the input end of the conveying frame (1), and an electrostatic eliminator (11) located above the lifting and positioning frame (4) is installed on the electrostatic support frame (10).

6. The food packaging bag storage and transfer device according to claim 1, characterized in that: The anti-slip structure comprises an anti-slip connection frame (13), the anti-slip connection frame (13) is provided with a plurality of anti-slip plates (14), and an anti-slip driving device acts on the anti-slip connection frame (13), so that the anti-slip plates (14) can move forward and backward and up and down relative to the conveying frame (1).

7. The food packaging bag storage and transfer device according to claim 6, characterized in that: The anti-slip driving device comprises an anti-slip front and rear driving device (15) and an anti-slip upper and lower driving device (16) connected to the output end of the anti-slip front and rear driving device (15); The anti-slip front and rear driving device (15) enables the anti-slip connecting frame (13) to move forward and backward relative to the conveying frame (1); The anti-slip up and down driving device (16) enables the anti-slip connecting frame (13) to move up and down relative to the conveying frame (1).

8. The food packaging bag storage and transfer device according to claim 1, characterized in that: A support seat (17) is provided at the bottom end of the conveying frame (1), a recovery channel (18) is provided on the support seat (17), and the recovery channel (18) runs through the output end of the conveying frame (1); The bottom surface of the recovery channel (18) is arranged in an inclined surface, and the depth of the recovery channel (18) gradually decreases along the conveying direction of the conveying frame (1).

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