Laser seal welding equipment for perfluorosulfonic acid proton exchange membrane of vanadium battery

By integrating the movable laser welding components, detection components and screening push components in the perfluorosulfonic acid proton exchange membrane laser seal welding equipment of vanadium battery, the problem of time-consuming and easy-to-missing welding quality inspection in the prior art is solved, and the welding process is realized Real-time inspection and automatic screening of unqualified products have improved processing efficiency and quality control.

CN119187865AInactive Publication Date: 2024-12-27JILIN ZHONGDING ELECTRIC POWER TECH DEV CO LTD
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
CN202411490350.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-10-24
Publication Date
2024-12-27
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

During the production and processing of existing vanadium batteries, the quality inspection of perfluorosulfonic acid proton exchange membrane laser seal welding is time-consuming and easy to miss, and there is a lack of real-time detection and screening mechanism.

Method used

A laser seal welding equipment for perfluorosulfonic acid proton exchange membrane of vanadium battery was designed, integrating movable laser welding components, movable detection components and screening push components. Through the coordinated work of the conveyor belt and multiple positioning seats, the welding part is realized. Real-time detection and automatic screening of unqualified products.

Benefits of technology

Real-time inspection of the welding process and automatic separation of unqualified products are realized, the efficiency and accuracy of welding quality control are improved, and the time and error of manual inspection are reduced.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN119187865A_ABST
    Figure CN119187865A_ABST
Patent Text Reader

Abstract

The invention is suitable for the technical field of battery processing and production, and provides a vanadium battery perfluorosulfonic acid proton exchange membrane laser seal welding device which comprises a welding rack; a conveyor belt; the first positioning seat is installed on the welding rack, and an inspection assembly is installed on the first positioning seat; the second positioning seat is mounted on the welding rack, and a movable laser welding assembly is mounted on the second positioning seat; the third positioning seat is mounted on the welding rack, and a movable detection assembly is mounted on the third positioning seat; the workpiece adjusting assembly is installed on the welding rack and located between the first positioning base and the second positioning base. The feeding robot assembly is installed on the welding rack and located between the second positioning base and the third positioning base. The screening and pushing assembly is installed on the welding rack and located on the rear side of the third positioning base. According to the laser welding device, the movable detection assembly and the screening and pushing assembly are arranged, the welded part can be checked and detected after laser welding is conducted on the battery, and the screening and pushing assembly is used for driving the battery to move in different directions according to the detection result.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The invention belongs to the technical field of battery processing and production, and in particular relates to laser sealing and welding equipment for a perfluorosulfonic acid proton exchange membrane of a vanadium battery. Background Art

[0002] All-vanadium redox flow battery, referred to as vanadium battery (VRB), is a redox battery in which the active material is in a circulating liquid state. It uses the different chemical potentials of vanadium ions in different oxidation states to store energy. It has the advantages of high charge and discharge efficiency, capacity can be increased with the increase of liquid storage tanks, and electrolyte can be recycled. Perfluorosulfonic acid proton exchange membrane is a solid polymer electrolyte with good chemical and thermal stability, voltage reduction, high conductivity, high mechanical strength, etc. It is a key component of the battery.

[0003] In the production and processing of vanadium batteries, laser sealing welding of perfluorosulfonic acid proton exchange membrane is an important process. In order to improve the processing process, most of the existing technologies are assembly line operations. In order to ensure the welding quality, the welding quality needs to be tested after the welding is completed. However, most of the existing technologies are to check or spot check a batch of workpieces after they are processed, which is time-consuming and prone to omissions. Summary of the invention

[0004] The purpose of the embodiment of the present invention is to provide a laser sealing welding device for a perfluorosulfonic acid proton exchange membrane of a vanadium battery, aiming to solve the problems arising from the above-mentioned background technology.

[0005] The embodiment of the present invention is implemented as follows: a laser sealing welding device for a vanadium battery perfluorosulfonic acid proton exchange membrane, comprising:

[0006] A welding frame, wherein a base is provided at the bottom of the welding frame, and a conveying slot is provided at the center of the welding frame;

[0007] A conveyor belt installed in the conveying trough;

[0008] A first positioning seat is installed on the welding frame and spans across the conveyor belt, and an inspection component is installed on the first positioning seat;

[0009] A second positioning seat is installed on the welding frame and spans across the conveyor belt, and a movable laser welding assembly is installed on the second positioning seat;

[0010] A third positioning seat is installed on the welding frame and spans across the conveyor belt, and an activity detection component is installed on the third positioning seat;

[0011] A workpiece adjustment assembly is installed on the welding frame and is located between the first positioning seat and the second positioning seat;

[0012] The feeding robot assembly is installed on the welding frame and is located between the second positioning seat and the third positioning seat;

[0013] The screening and pushing assembly is installed on the welding frame and is located at the rear side of the positioning seat three.

[0014] Preferably, the inspection component includes a camera 1, which is installed on the positioning seat 1 and is used to inspect the position of the workpiece.

[0015] Preferably, the workpiece adjustment assembly comprises:

[0016] A position pushing assembly is installed on one side of the welding frame and is used to push the workpiece to a preset position;

[0017] The clamping rotating assembly is installed on the other side of the welding frame, corresponding to the position pushing assembly, and is used to drive the workpiece to rotate and adjust to a preset angle.

[0018] Preferably, the position pushing assembly comprises:

[0019] A mounting seat 1, mounted on one side of the welding frame;

[0020] An electric push rod 1 is mounted on the mounting seat 1, and a driving end of the electric push rod 1 is fixedly connected to a workpiece push plate.

[0021] Preferably, the clamping and rotating assembly comprises:

[0022] A second mounting seat, mounted on the other side of the welding frame, and a driving device 1 is mounted on the second mounting seat;

[0023] The second electric push rod is drivingly connected to the output end of the driving device 1;

[0024] A clamping arm mounting seat is fixedly connected to the driving end of the second electric push rod, and a mounting groove is provided on the clamping arm mounting seat;

[0025] A driving positioning seat is installed in the installation slot, and a bidirectional telescopic arm is installed on the driving positioning seat;

[0026] There are two clamping arms, which are respectively installed on the two driving ends of the bidirectional telescopic arm, and anti-slip pads are provided on the opposite sides of the clamping arms.

[0027] Preferably, the active laser welding assembly comprises:

[0028] A second driving device is installed on one side of the second positioning seat, and an output end of the second driving device is connected to the first screw rod through a coupling;

[0029] Slider 1 is drivingly connected to the screw rod 1 in a threaded connection manner;

[0030] The electric push rod three is installed on the slider one, and the driving end of the electric push rod three is provided with a welding laser head for laser welding.

[0031] Preferably, the loading robot assembly comprises:

[0032] A driving device three is installed on the welding frame, and an output end of the driving device three is connected to the electric push rod four through a coupling;

[0033] The adsorption mounting arm is mounted on the driving end of the electric push rod 4, and a suction cup is mounted on the adsorption mounting arm for adsorbing proton exchange membrane loading.

[0034] Preferably, the activity detection component comprises:

[0035] A driving device 4 is installed on one side of the positioning seat 3, and an output end of the driving device 4 is drivingly connected to the screw rod 2 through a coupling;

[0036] Slider 2 is drivingly connected to the screw rod 2 in a threaded connection manner;

[0037] Camera 2 is installed on the slider 2.

[0038] Preferably, the screening and pushing assembly comprises:

[0039] A mounting seat three, mounted on one side of the welding frame;

[0040] The electric push rod five is mounted on the mounting seat three, and a discharging push plate is provided at the driving end of the electric push rod five.

[0041] Preferably, an outlet slot is provided on the welding frame, the outlet slot is located on the opposite side of the screening and pushing assembly, and a second collecting frame is provided under the outlet slot;

[0042] A collecting frame 1 is provided at the tail end of the conveyor belt, and buffer layers are respectively installed in the collecting frame 1 and the collecting frame 2.

[0043] A vanadium battery perfluorosulfonic acid proton exchange membrane laser sealing welding device provided in an embodiment of the present invention aims at the deficiencies in the prior art. In addition to being provided with an active laser welding component, an active detection component and a screening and pushing component are also provided. After the battery is laser welded, the welding part can be inspected and tested, and the screening and pushing component can be used to drive the battery to different directions according to the detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 A schematic structural diagram of a laser sealing welding device for a perfluorosulfonic acid proton exchange membrane for a vanadium battery provided in an embodiment of the present invention;

[0045] Figure 2 Another structural schematic diagram of a laser sealing welding device for a perfluorosulfonic acid proton exchange membrane of a vanadium battery provided by an embodiment of the present invention;

[0046] Figure 3 A top view of a laser sealing welding device for a perfluorosulfonic acid proton exchange membrane of a vanadium battery provided in an embodiment of the present invention;

[0047] Figure 4 A schematic structural diagram of a clamping rotating assembly in a laser sealing welding device for a perfluorosulfonic acid proton exchange membrane of a vanadium battery provided in an embodiment of the present invention.

[0048] In the attached drawings: 1-welding frame; 2-base; 3-conveyor belt; 4-positioning seat 1; 5-positioning seat 2; 6-positioning seat 3; 7-collection frame 1; 8-exit slot; 9-collection frame 2; 10-buffer layer; 11-camera 1; 12-mounting seat 1; 13-electric push rod 1; 14-workpiece push plate; 15-mounting seat 2; 16-driving device 1; 17-electric push rod 2; 18-clamping arm mounting seat; 19-mounting slot; 20-driving positioning seat ;21-bidirectional telescopic arm;22-clamping arm;23-anti-slip pad;24-driving device 2;25-screw rod 1;26-slider 1;27-electric push rod 3;28-welding laser head;29-driving device 3;30-electric push rod 4;31-adsorption installation arm;32-suction cup;33-driving device 4;34-screw rod 2;35-slider 2;36-camera 2;37-mounting seat 3;38-electric push rod 5;39-discharging push plate. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0050] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0051] like Figures 1 to 3 As shown, a structural diagram of a laser sealing welding device for a vanadium battery perfluorosulfonic acid proton exchange membrane provided by an embodiment of the present invention includes:

[0052] A welding frame 1, wherein a base 2 is provided at the bottom of the welding frame 1, and a conveying slot is provided at the center of the welding frame 1;

[0053] A conveyor belt 3, installed in the conveying trough;

[0054] A positioning seat 4 is installed on the welding frame 1 and spans the conveyor belt 3. An inspection component is installed on the positioning seat 4;

[0055] A second positioning seat 5 is installed on the welding frame 1 and spans the conveyor belt 3. A movable laser welding assembly is installed on the second positioning seat 5;

[0056] A positioning seat 3 6 is installed on the welding frame 1 and spans the conveyor belt 3. An activity detection component is installed on the positioning seat 3 ;

[0057] The workpiece adjustment assembly is installed on the welding frame 1 and is located between the positioning seat 1 4 and the positioning seat 2 5;

[0058] The feeding robot assembly is mounted on the welding frame 1 and is located between the second positioning seat 5 and the third positioning seat 6;

[0059] The screening and pushing assembly is installed on the welding frame 1 and is located at the rear side of the positioning seat 3 6.

[0060] In one embodiment of the present invention, the laser sealing welding equipment for vanadium battery perfluorosulfonic acid proton exchange membrane aims at the deficiencies in the prior art. On the basis of being provided with a movable laser welding component, an movable detection component and a screening and pushing component are also provided. After the battery is laser welded, the welding part can be inspected and tested, and the battery can be driven to different directions by using the screening and pushing component according to the test results.

[0061] The specific operation process of the equipment is as follows: place the battery assembly to be welded on the conveyor belt 3, start the conveyor belt 3 to drive it to pass through the inspection assembly, workpiece adjustment assembly, active laser welding assembly, active detection assembly and screening and pushing assembly in sequence, when the battery corresponds to different workstations, the conveyor belt 3 is controlled to stop, and when an operation is completed, the conveyor belt 3 is restarted, the inspection assembly determines the position of the workpiece, and according to the result, the workpiece adjustment assembly is started to drive the battery to a preset position, when it moves to correspond to the active laser welding assembly, the loading robot assembly is started to drive the proton exchange membrane to correspond to the battery assembly, and then the active laser welding assembly is used for laser welding, and then it is moved to correspond to the active detection assembly, and the welding position is detected by the active detection assembly, and then according to the result, the screening and pushing assembly is used to screen out unqualified products.

[0062] like Figure 2 As shown, as a preferred embodiment of the present invention, the inspection component includes a camera 11, which is installed on the positioning seat 4 and is used to inspect the position of the workpiece.

[0063] The camera 11 adopts a conventional camera device in the prior art, which can capture the image of the workpiece, judge the position to be welded according to the image of the workpiece, and then use the workpiece adjustment component to adjust, flip and perform other operations on the battery.

[0064] like Figure 2As shown, as another preferred embodiment of the present invention, the workpiece adjustment assembly includes:

[0065] A position pushing assembly, installed on one side of the welding frame 1, for pushing the workpiece to a preset position;

[0066] The clamping rotating assembly is installed on the other side of the welding frame 1, corresponding to the position pushing assembly, and is used to drive the workpiece to rotate and adjust to a preset angle.

[0067] When the battery moves to correspond to the workpiece adjustment assembly, the position pushing assembly is used to push the battery to the preset position (the center position of the conveyor belt 3), and then the clamping and rotating assembly is used to clamp the battery and rotate it so that the position to be welded is facing upward for subsequent laser welding operations.

[0068] like Figure 2 As shown, as a preferred embodiment of the present invention, the position pushing assembly includes:

[0069] A mounting seat 12, mounted on one side of the welding frame 1;

[0070] The electric push rod 13 is mounted on the mounting seat 12 , and the driving end of the electric push rod 13 is fixedly connected to the workpiece push plate 14 .

[0071] When the position of the battery is tilted, the electric push rod 13 is started to extend, and the electric push rod 13 drives the workpiece push plate 14 to move, thereby applying a thrust to the battery, thereby driving the battery to move to a preset position.

[0072] like Figure 2 and Figure 4 As shown, as a preferred embodiment of the present invention, the clamping and rotating assembly includes:

[0073] A second mounting seat 15, mounted on the other side of the welding frame 1, and a driving device 16 is mounted on the second mounting seat 15;

[0074] The electric push rod 2 17 is drivingly connected to the output end of the driving device 1 16;

[0075] A clamping arm mounting seat 18 is fixedly connected to the driving end of the electric push rod 17, and a mounting groove 19 is formed on the clamping arm mounting seat 18;

[0076] A driving positioning seat 20 is installed in the installation slot 19, and a bidirectional telescopic arm 21 is installed on the driving positioning seat 20;

[0077] There are two clamping arms 22 , which are respectively mounted on two driving ends of the bidirectional telescopic arm 21 , and anti-slip pads 23 are provided on opposite sides of the clamping arms 22 .

[0078] According to the position of the battery, the electric push rod 17 is started to extend and retract, thereby controlling the clamping arm 22 to approach the battery, and then the two-way telescopic arm 21 is started to contract, thereby driving the two clamping arms 22 to move closer to each other, thereby driving the clamping arms 22 to clamp and fix the battery, and the battery can be prevented from slipping under the action of the anti-slip pad 23, and then the driving device 16 is started as needed, and the driving device 16 drives the component to rotate, so as to adjust the angle of the battery.

[0079] like Figure 2 As shown, as a preferred embodiment of the present invention, the active laser welding assembly comprises:

[0080] The second driving device 24 is installed on one side of the second positioning seat 5, and the output end of the second driving device 24 is drivingly connected to the first screw rod 25 through a coupling;

[0081] A slider 26 is drivingly connected to the screw rod 25 in a threaded connection manner;

[0082] The electric push rod 3 27 is installed on the slider 1 26, and the driving end of the electric push rod 3 27 is provided with a welding laser head 28 for laser welding.

[0083] Start the driving device 24, which drives the screw rod 25 to rotate, and then drives the slider 26 to move. Then start the electric push rod 3 27 to extend and retract, and drive the driving device 3 29 to correspond to the welding position. Start the driving device 3 29 to perform laser welding.

[0084] like Figure 2 As shown, as a preferred embodiment of the present invention, the loading robot assembly includes:

[0085] A driving device 3 29 is installed on the welding frame 1, and an output end of the driving device 3 29 is drivingly connected to an electric push rod 4 30 through a coupling;

[0086] The adsorption mounting arm 31 is mounted on the driving end of the electric push rod 430, and a suction cup 32 is mounted on the adsorption mounting arm 31 for adsorbing the proton exchange membrane material.

[0087] Start the driving device three 29, which drives the electric push rod four 30 to rotate, thereby driving the adsorption installation arm 31 to correspond to the proton exchange membrane, and then start the electric push rod four 30 to contract, driving the suction cup 32 to approach the proton exchange membrane and adsorb and fix it, and then extend the electric push rod four 30 to lift the proton exchange membrane. Through the reverse rotation of the driving device three 29, the proton exchange membrane is driven to move to the conveyor belt 3 to correspond to the battery, and the laser welding process can be carried out.

[0088] like Figure 2 As shown, as a preferred embodiment of the present invention, the activity detection component includes:

[0089] A driving device 4 33 is installed on one side of the positioning seat 3 6, and an output end of the driving device 4 33 is drivingly connected to the screw rod 2 34 through a coupling;

[0090] The second slider 35 is drivingly connected to the second screw rod 34 in a threaded connection manner;

[0091] The second camera 36 is installed on the second slider 35 .

[0092] Start the driving device four 33, and the driving device four 33 drives the screw rod two 34 to rotate, which can drive the slider two 35 to move, thereby driving the camera two 36 to move, and the camera two 36 can be used to detect the image of the welding point on the battery, and whether the welding is qualified can be judged based on the image.

[0093] like Figure 1 As shown, as a preferred embodiment of the present invention, the screening and pushing assembly includes:

[0094] A mounting seat 37, mounted on one side of the welding frame 1;

[0095] The electric push rod five 38 is mounted on the mounting seat three 37, and the driving end of the electric push rod five 38 is provided with a discharging push plate 39.

[0096] When the welding result of the battery is judged to be unqualified according to the battery image detected by the active detection component, the electric push rod 5 38 is started to extend, and the electric push rod 5 38 drives the discharge push plate 39 to move and push the battery to move toward the original path, thereby separating qualified products from unqualified products.

[0097] like Figure 1 As shown, as a preferred embodiment of the present invention, an outlet slot 8 is provided on the welding frame 1, and the outlet slot 8 is located on the opposite side of the screening and pushing assembly, and a collecting frame 9 is provided under the outlet slot 8;

[0098] A collecting frame 1 7 is disposed at the tail end of the conveyor belt 3 , and a buffer layer 10 is installed in the collecting frame 1 7 and the collecting frame 2 9 , respectively.

[0099] The unqualified products are moved by the screening and pushing assembly, and the batteries can fall into the collecting frame 2 9, while the qualified products fall into the collecting frame 1 7 under the action of the conveyor belt 3, and the buffer layer 10 can protect the batteries.

[0100] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A laser sealing welding equipment for perfluorosulfonic acid proton exchange membrane of vanadium battery, characterized in that: include: A welding frame (1), wherein a base (2) is provided at the bottom of the welding frame (1), and a conveying groove is provided at the center of the welding frame (1); A conveyor belt (3) installed in the conveying trough; A positioning seat (4) is installed on the welding frame (1) and spans the conveyor belt (3), and an inspection component is installed on the positioning seat (4); A second positioning seat (5) is installed on the welding frame (1) and spans the conveyor belt (3), and a movable laser welding assembly is installed on the second positioning seat (5); A positioning seat three (6), mounted on the welding frame (1) and spanning the conveyor belt (3), wherein an activity detection component is mounted on the positioning seat three (6); A workpiece adjustment assembly is mounted on the welding frame (1) and is located between the first positioning seat (4) and the second positioning seat (5); A loading robot assembly is mounted on the welding frame (1) and is located between the second positioning seat (5) and the third positioning seat (6); The screening and pushing assembly is installed on the welding frame (1) and is located at the rear side of the positioning seat three (6).

2. The laser sealing welding equipment for perfluorosulfonic acid proton exchange membrane of vanadium battery according to claim 1 is characterized in that: The inspection component comprises a camera 1 (11) mounted on the positioning seat 1 (4) for inspecting the position of the workpiece.

3. The laser sealing welding equipment for perfluorosulfonic acid proton exchange membrane of vanadium battery according to claim 1 is characterized in that: The workpiece adjustment assembly comprises: A position pushing assembly, installed on one side of the welding frame (1), and used to push the workpiece to a preset position; The clamping rotating assembly is installed on the other side of the welding frame (1), corresponding to the position pushing assembly, and is used to drive the workpiece to rotate and adjust to a preset angle.

4. The laser sealing welding equipment for perfluorosulfonic acid proton exchange membrane of vanadium battery according to claim 3 is characterized in that: The position pushing component comprises: A mounting seat (12) mounted on one side of the welding frame (1); An electric push rod (13) is mounted on the mounting seat (12), and a driving end of the electric push rod (13) is fixedly connected to a workpiece push plate (14).

5. The laser sealing welding equipment for perfluorosulfonic acid proton exchange membrane of vanadium battery according to claim 4 is characterized in that: The clamping and rotating assembly comprises: A second mounting seat (15) is mounted on the other side of the welding frame (1), and a driving device (16) is mounted on the second mounting seat (15); The second electric push rod (17) is drivingly connected to the output end of the driving device (16); A clamping arm mounting seat (18) is fixedly connected to the driving end of the second electric push rod (17), and a mounting groove (19) is provided on the clamping arm mounting seat (18); A driving positioning seat (20) is installed in the installation groove (19), and a bidirectional telescopic arm (21) is installed on the driving positioning seat (20); Two clamping arms (22) are provided and are respectively mounted on two driving ends of the bidirectional telescopic arm (21); anti-slip pads (23) are provided on opposite sides of the clamping arms (22).

6. The laser sealing welding equipment for perfluorosulfonic acid proton exchange membrane of vanadium battery according to claim 1 is characterized in that: The active laser welding assembly comprises: A second driving device (24) is installed on one side of the second positioning seat (5), and an output end of the second driving device (24) is drivingly connected to a first screw rod (25) via a coupling; A slider (26) is drivingly connected to the screw rod (25) in a threaded connection manner; The electric push rod three (27) is installed on the slide block one (26), and the driving end of the electric push rod three (27) is provided with a welding laser head (28) for laser welding.

7. The laser sealing welding equipment for perfluorosulfonic acid proton exchange membrane of vanadium battery according to claim 1 is characterized in that: The feeding robot assembly comprises: A driving device three (29) is mounted on the welding frame (1), and an output end of the driving device three (29) is drivingly connected to an electric push rod four (30) via a coupling; The adsorption installation arm (31) is installed at the driving end of the electric push rod 4 (30), and a suction cup (32) is installed on the adsorption installation arm (31) for adsorbing proton exchange membrane loading.

8. The laser sealing welding equipment for perfluorosulfonic acid proton exchange membrane of vanadium battery according to claim 1 is characterized in that: The activity detection component includes: A drive device four (33) is installed on one side of the positioning seat three (6), and the output end of the drive device four (33) is drivingly connected to the screw rod two (34) through a coupling; The second slider (35) is drivingly connected to the second screw rod (34) in a threaded connection manner; Camera 2 (36) is mounted on the slider 2 (35).

9. The laser sealing welding equipment for perfluorosulfonic acid proton exchange membrane of vanadium battery according to claim 1 is characterized in that: The screening and pushing assembly comprises: A mounting seat three (37), mounted on one side of the welding frame (1); The electric push rod five (38) is mounted on the mounting seat three (37), and the driving end of the electric push rod five (38) is provided with a discharging push plate (39).

10. The laser sealing welding equipment for perfluorosulfonic acid proton exchange membrane of vanadium battery according to claim 9, characterized in that: The welding frame (1) is provided with an outlet slot (8), the outlet slot (8) is located on the opposite side of the screening and pushing assembly, and a second collecting frame (9) is provided under the outlet slot (8); A collecting frame 1 (7) is provided at the tail end of the conveyor belt (3), and a buffer layer (10) is installed in each of the collecting frame 1 (7) and the collecting frame 2 (9).