A pull tab delivery device for zipper pull assembly

Abstract

The application discloses a pull-tab conveying device for puller assembly, which is provided with a vibration disc used by a detection device, and the inner surface of the vibration disc is assembled with a spiral plate; the device comprises a conveying belt connected to the right rear surface of the outer surface of the vibration disc, the outer surface of the conveying belt is assembled with a conveying frame, the right surface of the outer surface of the conveying frame is installed with a rotating disc, and the right rear surface of the outer surface of the rotating disc is assembled with a supporting frame. The pull-tab conveying device for puller assembly is provided with the vibration disc for primary screening of pull tabs, and is matched with an assembly lower sliding conveying plate, so that one side of the pull-tab head can be effectively moved downward and conveyed, and the use of the spiral plate and the correction plate can reversely flip and slide down the position opposite to the direction of the puller, and the pull tabs which do not meet the requirements or have the head opposite to the tail are discharged by matching the telescopic plate.

Description

Technical Field

[0001] This invention relates to the technical field of sheet conveying devices, specifically a sheet conveying device for sheet assembly. Background Technology

[0002] The zipper pull conveyor is used to transport the zipper pull and the handle attached to it. During transport, it inspects the external shape and surface finish of the zipper pull. Since the zipper pulls are crucial components of the zipper, their different shapes and structures result in different performance characteristics. Furthermore, different clothing brands may have their brand logos printed or engraved on the top of the zipper pull. These components must undergo inspection before assembly and use. However, existing zipper pull conveyor devices still have some issues in their operation.

[0003] In the prior art, the patent announcement number CN206515256U, entitled "A Detection Device for a Zipper Head", includes a feeding device, a first detection camera for detecting the zipper body, and a second detection camera for detecting the zipper tab. The feeding device is provided with a guide rail for the zipper head to move through, and a detection through hole connected to the guide rail for facilitating the detection of the zipper body. The feeding device is equipped with a first positioning device for positioning the zipper head at the detection through hole, and a second positioning device for positioning the zipper head in the zipper tab detection area. The first detection camera is located on the rear side of the feeding device with its lens facing the detection through hole, and the second detection camera is located on the front side of the feeding device with its lens facing the zipper tab detection area, so as to ensure the accuracy of the detection of the zipper body and the zipper tab.

[0004] During the operation of the above-mentioned device, a discharge seat that can be moved out to discharge unqualified zipper heads can be provided at the pull tab detection area of ​​the feeding device. It also includes a drive device for driving the discharge seat to extend and retract. It should be noted that the discharge seat is part of the feeding device. A part of the guide rail is machined on the discharge seat. The zipper head moves along the guide rail to the pull tab detection area and moves to the discharge seat, and is positioned by the second positioning device. At this time, if both the pull body and the pull tab of the zipper head are qualified, the driver of the second positioning device drives the baffle to retract, so that the zipper head continues to move forward along the guide rail. If the pull body and / or pull tab of the zipper head are unqualified, a signal is transmitted to the drive device to drive the discharge seat to extend, so that the unqualified zipper head is discharged from the discharge seat, thus achieving the function of automatically separating the unqualified zipper head. However, in use, only the zipper head is positioned and detected, which can easily lead to quality differences between the assembled zipper heads and pull tabs, or damaged pull tab components, resulting in low zipper quality.

[0005] In addition, in the prior art, the patent announcement number CN212147276U, "A zipper head feeding device with pull tab detection function" includes: a zipper head vibratory plate; a zipper head guide rail, the upper feeding end of which is connected to the zipper head vibratory plate, and the lower discharging end which is downward and corresponds to the positioning groove of the injection mold; the zipper head can slide vertically downward along the zipper head guide rail; an elastic limiting mechanism, which is used to limit the zipper head from disengaging from the zipper head guide rail; a zipper head pushing mechanism, which is used to make the zipper head disengage downward from the elastic limiting mechanism and position it in the positioning groove; and a pull tab guide rail, which is arranged opposite to the zipper head guide rail so that the pull tab, which is movably connected to the zipper head at one end, can slide downward in a state where the other end is inclined upward and laterally abuts against the pull tab guide rail.

[0006] During the operation of the above-mentioned device, the pull tab guide rail is locked and fixedly connected to the pull head guide rail via a connecting block. The sensing mechanism includes a photoelectric sensor and a sensor mounting base installed at the lower end of the pull tab guide rail. The photoelectric sensor is fixedly mounted on the sensor mounting base to sense the pull tab that has detached from the pull tab guide rail. The sensor mounting base has a pull tab clearance groove. After the pull tab detaches downward from the pull tab guide rail, it can pass through the pull tab clearance groove and be positioned on the injection mold; the photoelectric sensor can sense the pull tab that has passed through the pull tab clearance groove. The photoelectric sensor is a through-beam fiber optic amplifier. The transmitting and receiving parts of the through-beam fiber optic amplifier are respectively located on two opposite sides of the pull tab clearance groove, and they cooperate to detect the pull tab passing through it. The distance between the bottom of the pull tab guide rail and the injection mold can be adjusted as needed. However, this distance must be sufficient so that after the pull head is positioned in the positioning groove, the pull tab can detach from the pull tab guide rail and fall onto the injection mold. However, during use, only the movement position of the pull tab can be monitored, and it is inconvenient to effectively detect the quality of the pull tab. Summary of the Invention

[0007] The purpose of this invention is to provide a zipper pull conveying device for zipper head assembly, in order to solve the problems mentioned in the background art, which, when in use, only the positioning detection of the zipper head is performed, which easily leads to quality differences between the assembled zipper head and the zipper pull, or the presence of damaged zipper pull parts resulting in low zipper quality. It can only monitor the movement position of the zipper pull, and is inconvenient to effectively detect the quality of the zipper pull.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a pull tab conveying device for pull tab assembly, which is equipped with a vibrating plate for use by a detection device, and a spiral plate is assembled on the inner surface of the vibrating plate;

[0009] Includes: a conveyor belt connected to the right rear side of the outer surface of the vibrating plate, and a conveyor frame assembled on the outer surface of the conveyor belt, and a turntable installed on the right side of the outer surface of the conveyor frame, while a support frame is assembled on the right rear side of the outer surface of the turntable.

[0010] A fixing plate is installed on the upper side of the outer surface of the support frame, and a rotating assembly is assembled on the left side of the outer surface of the support frame;

[0011] The rotating component can control the height of the moving plate;

[0012] The material discharge assembly is assembled on the lower right side of the outer surface of the turntable.

[0013] Preferably, a conveying plate is installed on the right side of the outer surface of the spiral plate, and the outer surface of the conveying plate has a bent structure. A correction plate is provided on the right side of the outer surface of the spiral plate, and there is a distance between the left side of the outer surface of the correction plate and the right side of the outer surface of the spiral plate.

[0014] With the above structure, the pull plate can be stably vibrated and conveyed downwards during use. In conjunction with the correction plate, the direction of the head and tail can be controlled by the gravity of one end of the pull plate.

[0015] Preferably, the conveyor frame and the conveyor belt form a rotating structure, and a guide block two is installed on the left side of the outer surface of the conveyor frame, and a material collection bin one is nested and connected to the lower left side of the outer surface of the conveyor frame. At the same time, the front side of the outer surface of the guide block two has a bent structure.

[0016] The above structure enables stable conveying during use, and, in conjunction with guide block one and guide block two, it enables effective uprighting and conveying.

[0017] Preferably, a guide block is installed on the right side of the outer surface of the conveyor frame, and a moving groove is provided on the inner surface of the guide block, and a positioning screw is slidably connected to the inner surface of the moving groove.

[0018] The above structure enables stable positioning and assembly during use, and the angle of the guide block assembly is controlled according to the size of the pull tab, thus improving usability.

[0019] Preferably, the guide block 1 forms a limiting rotational structure with the conveyor frame through positioning screws and a moving groove, and the inner surface of the moving groove has an arc-shaped structure, and the guide block 1 is alternately arranged on the front and rear sides of the upper surface of the conveyor belt.

[0020] The above structure enables stable movement and adjustment during use, improving the efficiency of the device and increasing its adaptability.

[0021] Preferably, a support base is installed on the right rear side of the outer surface of the conveyor frame, and a sensor is installed on the upper surface of the support base. The sensor is located at the upper end of the turntable. At the same time, a feed inlet is opened at equal angles on the outer surface of the turntable. A baffle is installed on the rear side of the upper surface of the worktable on the outer surface of the turntable. The feed inlet is set at equal angles with respect to the central axis of the outer surface of the turntable, and the inner surface of the feed inlet is vertically opposite to the position of the sensor's monitoring head.

[0022] With the above structure and the use of sensors, the rotation of the device turntable is effectively controlled, and the pull sheet is moved to the feed port and conveyed on the platform.

[0023] Preferably, a guide post is installed through the inner surface of the fixing plate, and a fixing cover is installed on the lower surface of the guide post. The fixing cover and the fixing plate form a limiting moving structure through the guide post. At the same time, a support member is slidably connected to the inner surface of the fixing plate, and an industrial camera is installed on the lower surface of the support member. The industrial camera and the fixing plate form a limiting sliding structure through the support member. The vertical central axis of the industrial camera coincides with that of the fixing cover.

[0024] The above structure effectively improves the stability of the device during use, and, in conjunction with the assembled guide pillars and support components, controls the position and height of the fixing cover and industrial camera, allowing them to work together and adjust according to the usage conditions.

[0025] Preferably, a movable plate is telescopically connected to the rear side of the inner surface of the rotating assembly, and a telescopic clamp is connected to the inner surface of the movable plate through a rotary cylinder. A clamping block is threadedly assembled on the outer surface of the telescopic clamp. At the same time, the clamping block and the rotary cylinder form a centering adjustment structure through the telescopic clamp and the rotary cylinder. Thus, the rotary cylinder and the movable plate form a rotation structure, and the movable plate and the rotating assembly form a telescopic structure.

[0026] With the above structure, the height of the moving plate can be controlled according to the thickness of the pull tab during use, and the pull tab can be effectively clamped and flipped by the telescopic clamp and clamping block.

[0027] Preferably, the upper surface of the discharge assembly is connected to a telescopic plate via a telescopic rod, and a material collection bin II is placed on the lower side of the outer surface of the telescopic plate. The telescopic plate and the discharge assembly form a telescopic structure, and the outer surface of the telescopic plate has an "L" shaped structure.

[0028] The above structure enables stable telescopic adjustment during use, allowing defective or misplaced pull tabs to be discharged.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] 1. This pull-tab conveying device for pull-tab assembly is equipped with a vibrating plate for primary screening of pull-tabs, and is used in conjunction with a sliding conveyor plate to effectively move and convey one side of the pull-tab head downwards. With the use of a spiral plate and a correcting plate, the pull-tab head can be reversed and slid down in the opposite direction. It is then conveyed to the lower side of an industrial camera set above the turntable for identification and detection through the cooperation of guide block one and guide block two. Pull-tabs that do not meet the requirements or have reversed head and tail are discharged with the help of a telescopic plate.

[0031] 2. The pull sheet conveying device for pull head assembly is equipped with a guide block two, which can extrude the pull sheets that overlap and move on the conveyor belt. In conjunction with the rotatable guide block one, the angle of the pull sheets and their position on the conveyor belt are gradually corrected. The device detects the movement to the feed inlet through a sensor, rotates the turntable, and controls an industrial camera for detection. The industrial camera can be used with the assembled support components and the fixed plate and guide column of the support components to improve the detection stability and improve the sufficiency of the detection image by adjusting the detection distance.

[0032] 3. The pull tab conveying device for pull head assembly is equipped with a stable supporting rotating component and can limit the movement of the moving plate. The telescopic clamp and clamping block are positioned slightly higher than the lower surface of the turntable, ensuring that the center position is consistent with the middle position of the pull tab. This effectively controls the height of the clamping block, clamps and rotates pull tabs with flipped surfaces for correction and inspection, and allows pull tabs with reversed ends and unqualified pull tabs to pass directly through and be collected in the collection bin. Those that pass inspection are conveyed to the parts to be assembled for use. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the three-dimensional structure of the vibrating disc of the present invention;

[0034] Figure 2 This is a schematic diagram of the three-dimensional structure of the conveyor belt of the present invention;

[0035] Figure 3 This is a schematic diagram of the three-dimensional structure of the correction plate of the present invention;

[0036] Figure 4 This is a three-dimensional structural diagram of the guide block of the present invention;

[0037] Figure 5 This is a schematic diagram of the three-dimensional structure of the turntable of the present invention;

[0038] Figure 6 This is a schematic diagram of the three-dimensional structure of the clamping block of the present invention;

[0039] Figure 7 This is a schematic diagram of the three-dimensional structure of the telescopic plate of the present invention.

[0040] In the diagram: 1. Vibratory feeder; 2. Spiral plate; 3. Conveyor plate; 4. Correcting plate; 5. Conveyor belt; 6. Conveyor frame; 601. Guide block one; 602. Moving trough; 603. Positioning screw; 7. Guide block two; 8. Collection bin one; 9. Sensor; 10. Support base; 11. Turntable; 12. Feed inlet; 13. Baffle; 14. Support frame; 15. Fixing plate; 16. Guide column; 17. Fixing cover; 18. Support component; 19. Industrial camera; 20. Rotating assembly; 2001. Moving plate; 2002. Telescopic clamp; 2003. Clamping block; 21. Discharge assembly; 22. Telescopic plate; 23. Collection bin two. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Please see Figures 1-7 The present invention provides a technical solution: a pull tab conveying device for pull tab assembly, which is provided with a vibrating plate 1 for use by a detection device, and a spiral plate 2 is assembled on the inner surface of the vibrating plate 1.

[0043] Includes: a conveyor belt 5 connected to the right rear side of the outer surface of the vibrating plate 1, and a conveyor frame 6 assembled on the outer surface of the conveyor belt 5, and a turntable 11 installed on the right side of the outer surface of the conveyor frame 6, while a support frame 14 is assembled on the right rear side of the outer surface of the turntable 11.

[0044] A fixing plate 15 is installed on the upper side of the outer surface of the support frame 14, and a rotating component 20 is assembled on the left side of the outer surface of the support frame 14.

[0045] A conveyor plate 3 is installed on the right side of the outer surface of the spiral plate 2, and the outer surface of the conveyor plate 3 has a bent structure. A correction plate 4 is provided on the right side of the outer surface of the spiral plate 2, and there is a distance between the left side of the outer surface of the correction plate 4 and the right side of the outer surface of the spiral plate 2.

[0046] The conveyor frame 6 and the conveyor belt 5 form a rotating structure, and a guide block 7 is installed on the left side of the outer surface of the conveyor frame 6. A collection bin 8 is nested and connected to the lower left side of the outer surface of the conveyor frame 6. At the same time, the front side of the outer surface of the guide block 7 has a bent shape.

[0047] A guide block 601 is installed on the right side of the outer surface of the conveyor frame 6, and a moving groove 602 is opened on the inner surface of the guide block 601, and a positioning screw 603 is slidably connected to the inner surface of the moving groove 602.

[0048] The guide block 601 forms a limiting rotating structure with the conveyor frame 6 through the positioning screw 603 and the moving groove 602. The inner surface of the moving groove 602 has an arc shape, and the guide block 601 is alternately arranged on the front and rear sides of the upper surface of the conveyor belt 5.

[0049] A support base 10 is installed on the right rear side of the outer surface of the conveyor frame 6, and a sensor 9 is installed on the upper surface of the support base 10. The sensor 9 is located at the upper end of the turntable 11. At the same time, a feed port 12 is opened at equal angles on the outer surface of the turntable 11. A baffle 13 is installed on the rear side of the upper surface of the worktable on the outer surface of the turntable 11. The feed port 12 is set at equal angles with respect to the central axis of the outer surface of the turntable 11, and the inner surface of the feed port 12 is vertically opposite to the position of the monitoring head of the sensor 9.

[0050] A guide post 16 is installed through the inner surface of the fixed plate 15, and a fixed cover 17 is installed on the lower surface of the guide post 16. The fixed cover 17 and the fixed plate 15 form a limiting moving structure through the guide post 16. At the same time, a support member 18 is slidably connected to the inner surface of the fixed plate 15, and an industrial camera 19 is installed on the lower surface of the support member 18. The industrial camera 19 and the fixed plate 15 form a limiting sliding structure through the support member 18. The vertical central axis of the industrial camera 19 coincides with that of the fixed cover 17.

[0051] In use, the vibratory plate 1 on the pull tab detection device is activated and moves on the spiral plate 2 assembled on the vibratory plate 1. When it moves to the upper end of the spiral plate 2, it will be moved downward by the gravity of one end of the pull tab and then moved onto the conveyor belt 5 assembled on the conveyor frame 6 via the conveyor plate 3. If the pull tab being conveyed on the spiral plate 2 is upside down, the pull tab will be continuously fed onto the correction plate 4 assembled on the vibratory plate 1. Through the gap between the correction plate 4 and the spiral plate 2, when the pull tab detaches from the end of the spiral plate 2, it will be rotated and moved downward by gravity and then conveyed onto the conveyor belt 5. Plate 3 moves onto conveyor belt 5, and the pull pieces on conveyor belt 5 are first removed by the use of guide block 2 7, and the pull pieces are moved to collection bin 1 8, and then continuously conveyed on conveyor belt 5. With the help of guide block 1 601 assembled on conveyor belt 5, continuous guidance and centering alignment are performed. Before use, guide block 1 601 can be adjusted and assembled with moving groove 602 and positioning screw 603. The angle and position of guide block 1 601 can be adjusted according to the width of pull piece to control centering stability, and the pull piece is continuously fed into the feed port 12 opened on turntable 11.

[0052] When the pull sheet enters the feed port 12 of the turntable 11, the sensor 9 installed on the upper side of the support base 10 of the conveyor frame 6 will sense that there is a pull sheet in the feed port 12, and then control the motor on the lower side of the platform of the turntable 11 to rotate, control the output shaft to drive the turntable 11 to rotate, and move the pull sheet with the baffle 13 of the platform assembly to the lower side of the fixed cover 17 and the industrial camera 19 for image recognition, to detect the quality of the pull sheet and whether its head and tail are reversed. When in use, the fixed cover 17 and the industrial camera 19 are supported and controlled by the fixed plate 15 installed on the support frame 14. The fixed cover 17 with the assembled guide column 16 can adjust the height, and the industrial camera 19 is controlled by the assembled support 18, so that the two are aligned and work together.

[0053] A movable plate 2001 is telescopically connected to the rear side of the inner surface of the rotating assembly 20, and a telescopic clamp 2002 is connected to the inner surface of the movable plate 2001 through a rotary cylinder. A clamping block 2003 is threadedly assembled on the outer surface of the telescopic clamp 2002. The clamping block 2003 forms a centering adjustment structure with the rotary cylinder through the telescopic clamp 2002. Thus, the rotary cylinder and the movable plate 2001 form a rotation structure, and the movable plate 2001 and the rotating assembly 20 form a telescopic structure.

[0054] The rotating component 20 can control the height of the moving plate 2001;

[0055] The material discharge assembly 21 is assembled on the lower right side of the outer surface of the turntable 11.

[0056] The upper surface of the discharge assembly 21 is connected to the telescopic plate 22 by a telescopic rod, and the lower side of the outer surface of the telescopic plate 22 is a material collection bin 23. The telescopic plate 22 and the discharge assembly 21 form a telescopic structure, and the outer surface of the telescopic plate 22 is L-shaped.

[0057] When the industrial camera 19 detects that the ends are reversed, the turntable 11 will continuously rotate carrying the pull piece and move it to the telescopic plate 22 of the discharge assembly 21. The telescopic plate 22 will then retract to collect the reversed pull piece into the collection bin 23. When the front and back of the pull piece are reversed at the detection point of the industrial camera 19, the turntable 11 will transport the pull piece to the inner surface of the clamping block 2003. The rotating assembly 20 will control the height of the moving plate 2001, and the telescopic clamp 2002 and clamping block 2003 on the moving plate 2001 will clamp the pull piece and reverse its front and back. This will effectively detect the pull piece. After normal detection and detection after front and back correction, the quality-passing pull pieces can be transported to the telescopic plate 22 and moved to the next component for operation. The unqualified pull pieces will fall into the collection bin 23 through the retraction of the telescopic plate 22.

[0058] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0059] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pull tab conveying device for pull tab assembly, comprising a vibratory plate (1) for use by a detection device, wherein a spiral plate (2) is assembled on the inner surface of the vibratory plate (1). Its features are, include: The conveyor belt (5) is connected to the right rear side of the outer surface of the vibrating plate (1), and a conveyor frame (6) is assembled on the outer surface of the conveyor belt (5), and a turntable (11) is installed on the right side of the outer surface of the conveyor frame (6), while a support frame (14) is assembled on the right rear side of the outer surface of the turntable (11). A conveying plate (3) is installed on the right side of the outer surface of the spiral plate (2), and the outer surface of the conveying plate (3) is bent. A correction plate (4) is provided on the right side of the outer surface of the spiral plate (2), and there is a distance between the left side of the outer surface of the correction plate (4) and the right side of the outer surface of the spiral plate (2). The outer surface of the conveyor frame (6) is equipped with a guide block (601) that is oppositely arranged, and the inner surface of the guide block (601) is provided with a moving groove (602), and the inner surface of the moving groove (602) is slidably connected with a positioning screw (603). A fixing plate (15) is installed on the upper side of the outer surface of the support frame (14), and a rotating component (20) is assembled on the left side of the outer surface of the support frame (14). The inner surface of the rotating assembly (20) is telescopically connected to a movable plate (2001), and the inner surface of the movable plate (2001) is connected to a telescopic clamp (2002) via a rotary cylinder. The outer surface of the telescopic clamp (2002) is threaded with a clamping block (2003). The clamping block (2003) forms a central adjustment structure with the rotary cylinder via the telescopic clamp (2002). The rotary cylinder and the movable plate (2001) form a rotation structure. The movable plate (2001) and the rotating assembly (20) form a telescopic structure. The rotating component (20) can control the height of the moving plate (2001); The discharge assembly (21) is assembled on the lower right side of the outer surface of the turntable (11).

2. The pull tab conveying device for pull head assembly according to claim 1, characterized in that: The outer surface of the conveyor frame (6) is equipped with a guide block 2 (7) on the left side, and the lower left side of the outer surface of the conveyor frame (6) is nested with a material collection bin 1 (8). Meanwhile, the outer surface of the guide block 2 (7) has a bent shape on the front side.

3. The pull tab conveying device for pull head assembly according to claim 1, characterized in that: The guide block (601) forms a limiting rotating structure with the conveyor frame (6) through the positioning screw (603) and the moving groove (602), and the inner surface of the moving groove (602) is an arc-shaped structure, and the guide block (601) is alternately arranged on the front and rear sides of the upper surface of the conveyor belt (5).

4. The pull tab conveying device for pull head assembly according to claim 1, characterized in that: A support base (10) is installed on the right rear side of the outer surface of the conveyor frame (6), and a sensor (9) is installed on the upper surface of the support base (10). The sensor (9) is located at the upper end of the turntable (11). At the same time, a feed inlet (12) is opened at an equal angle on the outer surface of the turntable (11). A baffle (13) is installed on the rear side of the upper surface of the worktable on the outer surface of the turntable (11), and the inner surface of the feed inlet (12) is set opposite to the monitoring head of the sensor (9).

5. A pull tab conveying device for pull head assembly according to claim 1, characterized in that: The inner surface of the fixed plate (15) is through which a guide post (16) is installed, and a fixed cover (17) is installed on the lower surface of the guide post (16). The fixed cover (17) and the fixed plate (15) form a limiting moving structure through the guide post (16). At the same time, a support member (18) is slidably connected to the inner surface of the fixed plate (15), and an industrial camera (19) is installed on the lower surface of the support member (18). The industrial camera (19) and the fixed plate (15) form a limiting sliding structure through the support member (18). The industrial camera (19) and the fixed cover (17) are coaxially arranged.

6. The pull tab conveying device for pull head assembly according to claim 1, characterized in that: The upper surface of the discharge assembly (21) is connected to a telescopic plate (22) via a telescopic rod, and a material collection bin (23) is placed on the lower side of the outer surface of the telescopic plate (22). The telescopic plate (22) and the discharge assembly (21) form a telescopic structure, and the outer surface of the telescopic plate (22) is in the shape of an "L" shape.

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