Device for collecting whole blood at one time, separating PRP and filtering white blood cells

Abstract

The invention relates to the technical field of medical instruments, and discloses a one-time whole blood collection, PRP separation and leukocyte filtering device which comprises an outer cover, an ejection assembly, a discharging assembly and a collection assembly. An ingenious linkage design is shown in unloading and collecting links, when separation is finished, the cover plate is opened, the positioning spring releases elastic potential energy, and the separation barrel is pushed to move upwards. By means of the ingenious structural linkage design, white blood cell discharging and platelet collecting are completed at a time, operation is easy and convenient, a series of automatic operation can be triggered only by opening the cover plate, discharging and collecting efficiency is greatly improved, the problems of component residues and loss possibly occurring in a traditional mode are solved, and the labor intensity of workers is relieved. The collected leukocytes and platelets are ensured to have high purity and integrity, and the quality and efficiency of the whole blood component separation work are remarkably improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and specifically relates to a disposable whole blood collection and PRP white blood cell filtration device for separating PRP from whole blood and filtering white blood cells. Background Art

[0002] In the field of clinical blood component separation, efficiently obtaining high-purity platelets (PRP) and removing white blood cells are key steps in treatments such as tissue repair and regenerative medicine. Although traditional whole blood separation devices achieve component separation based on the centrifugation principle, there are significant technical bottlenecks in the discharging and collection processes, seriously affecting the operation efficiency and separation quality.

[0003] After the separation of traditional devices is completed, it is necessary to manually open the valve at the bottom of the separation cylinder to discharge white blood cells. During the operation, sample leakage is likely to occur due to seal failure; and the platelets attached to the inner wall of the separation chamber need to be collected one by one manually using a scraper, which is time-consuming and laborious and difficult to completely remove, seriously affecting the concentration of PRP and the treatment effect.

[0004] In view of this, the present invention is specifically proposed. Summary of the Invention

[0005] To solve the technical problems that after the separation of traditional devices is completed, it is necessary to manually open the valve at the bottom of the separation cylinder to discharge white blood cells, and sample leakage is likely to occur due to seal failure during the operation; and the platelets attached to the inner wall of the separation chamber need to be collected one by one manually using a scraper, which is time-consuming and laborious and difficult to completely remove, seriously affecting the concentration of PRP and the treatment effect, the basic concept of the technical solution adopted by the present invention is: A disposable whole blood collection and PRP white blood cell filtration device, comprising an outer cover and a cover plate rotatably connected thereto.

[0006] A driving motor is installed on the outer cover, the output end of the driving motor is inserted with a separation cylinder, and a filter cylinder is installed inside the separation cylinder; A jacking assembly for jacking the separation cylinder upward after the cover plate is opened is installed on the separation cylinder. The jacking assembly includes a positioning spring installed between the separation cylinder and the outer cover; A discharging assembly for discharging white blood cells is installed on the separation cylinder. The discharging assembly includes a sealing plug inserted at the bottom of the separation cylinder, a cavity is opened on the separation cylinder, and after the separation cylinder moves, the sealing plug is driven to be inserted into the cavity to complete the discharging operation; A collection assembly for collecting platelets is installed inside the outer cover. The collection assembly includes a swing arm, one end of the swing arm is connected to a scraper that slides vertically inside the outer cover, and the other end of the swing arm is lapped on a lifting plate installed on the side wall of the separation cylinder. After the separation cylinder moves, the scraper is driven to move down along the outer cover to complete the collection operation.

[0007] As a preferred embodiment of the present invention, four support legs are installed at the bottom corners of the outer cover. A substrate is installed at the bottom of the four support legs. The substrate is frustum-shaped. A lifting ring is installed on the side wall of the outer cover. An observation window is provided on the outer cover, and scale lines are engraved on the observation window.

[0008] As a preferred embodiment of the present invention, a soft pad is provided at the connection between the cover plate and the outer cover, and a mounting plate is installed on the side wall of the cover plate and the outer cover. A locking bolt is installed inside the mounting plate. A turntable is rotatably installed at the bottom of the cover plate. A sealing gasket is installed on the turntable, and the sealing gasket fits on the surfaces of the separation cylinder and the filter cylinder.

[0009] As a preferred embodiment of the present invention, a transmission shaft is installed at the output end of the driving motor. The transmission shaft movably penetrates the bottom of the outer cover, and a cross shaft is installed at the end of the transmission shaft. A plug shaft is inserted into the side wall of the cross shaft, and the plug shaft is installed at the bottom of the separation cylinder.

[0010] As a preferred embodiment of the present invention, a positioning sleeve is installed at the end of the transmission shaft. The inner wall of the positioning sleeve is movably inserted with the plug shaft. A positioning plate is fixedly installed at the bottom of the separation cylinder. A positioning spring is sleeved on the positioning sleeve. One end of the positioning spring is clamped on the positioning plate, and the other end of the positioning spring is clamped on the end of the positioning sleeve.

[0011] As a preferred embodiment of the present invention, a discharge pipe is installed at the discharge port of the separation cylinder. A collection tray is movably inserted on the outer side wall of the discharge pipe, and the collection tray is located at the bottom of the separation cylinder. A plug rod is installed on the collection tray. The plug rod is movably inserted into the discharge pipe, and the top of the plug rod is connected to the sealing plug.

[0012] As a preferred embodiment of the present invention, a baffle is installed on the outer side wall of the discharge pipe. A return spring is sleeved on the side wall of the discharge pipe. One end of the return spring is clamped on the baffle, and the other end of the return spring is clamped on the inner wall of the collection tray.

[0013] As a preferred embodiment of the present invention, a support frame is installed on the side wall of the collection tray. A rocker arm is rotatably installed at the top of the support frame, and a torsion spring is clamped between the rocker arm and the support frame. A strip-shaped groove is opened at the end of the rocker arm. A sliding rod is slidably arranged inside the strip-shaped groove. Connecting frames are installed at both ends of the sliding rod. The connecting frames are connected to the side wall of the scraping plate. A collection hopper is installed at the bottom of the outer cover, and the collection hopper is located below the scraping plate.

[0014] The present invention has the following beneficial effects compared with the prior art: The present invention shows an exquisite linkage design in the unloading and collection links. When the separation is completed, the cover is opened, the positioning spring releases elastic potential energy, and pushes the separation cylinder upward. This upward movement simultaneously triggers the two key processes of white blood cell unloading and platelet collection. In terms of leukocyte unloading, the separation cylinder drives the sealing plug to be inserted into the cavity, instantly opening the channel between the inside of the separation cylinder and the unloading tube, so that the leukocytes in the separation cylinder can be smoothly discharged into the collection plate below through the unloading tube. The collection plate is connected to the sealing plug through an insertion rod, which ensures the stability of the unloading process and eliminates the risk of leukocyte leakage; in the platelet collection process, the upward movement of the separation cylinder drives the lifting plate on its side wall to rise synchronously, and the lifting plate drives the rocker arm to rotate. The rotation of the rocker arm prompts the scraper connected to it to move down along the inner wall of the outer cover, accurately scraping off the platelets attached to the inner wall of the outer cover and dropping them into the collection bucket below; this ingenious structural linkage design makes leukocyte unloading and platelet collection in one go, which is not only easy to operate, but also triggers a series of automatic operations by simply opening the cover, and greatly improves the efficiency of unloading and collection, avoids the problems of component residue and loss that may occur in traditional methods, ensures that the collected leukocytes and platelets are of high purity and integrity, and significantly improves the quality and efficiency of the entire blood component separation work.

[0015] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In the attached picture: Figure 1 A schematic diagram of the three-dimensional structure of a device for collecting whole blood and separating PRP leukocytes at one time; Figure 2 It is a schematic diagram of the lateral structure of a device for collecting whole blood and separating PRP leukocytes at one time; Figure 3 Partial cross-section of the device for collecting whole blood and separating PRP leukocytes at one time Figure 1 ; Figure 4 Partial cross-section of the device for collecting whole blood and separating PRP leukocytes at one time Figure 2 ; Figure 5 A device for collecting whole blood and separating PRP leukocytes at one time Figure 4 Enlarged view of point A in the middle; Figure 6 A device for collecting whole blood and separating PRP leukocytes at one time Figure 4 Enlarged view of point B in the middle.

[0017] In the figure: 1. Outer cover; 2. Cover plate; 3. Mounting plate; 4. Lifting ring; 5. Observation window; 6. Support leg; 7. Substrate; 8. Driving motor; 9. Transmission shaft; 10. Cross shaft; 11. Insertion shaft; 12. Separation cylinder; 13. Filter cartridge; 14. Turntable; 15. Gasket; 16. Collection tray; 17. Discharge pipe; 18. Baffle; 19. Return spring; 20. Insert rod; 21. Sealing plug; 22. Cavity; 23. Positioning plate; 24. Positioning spring; 25. Positioning sleeve; 26. Collection hopper; 27. Scraper; 28. Connecting frame; 29. Rocker arm; 30. Strip groove; 31. Slide bar; 32. Support frame; 33. Torsion spring; 34. Lifting plate. Detailed implementation mode

[0018] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments in conjunction with the accompanying drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention. Embodiment

[0019] As Figures 1 to 6 shown, a device for separating PRP and filtering white blood cells from whole blood collected at one time includes an outer cover 1 and a cover plate 2 rotatably connected thereto. This rotatable connection design greatly facilitates the opening and closing operations of the device and improves the convenience of use.

[0020] A driving motor 8 is installed on the outer cover 1, and the output end of the driving motor 8 is inserted into the separation cylinder 12. This connection method ensures efficient and stable power transmission, reduces energy loss, and a filter cartridge 13 is installed inside the separation cylinder 12. The two work together to lay a solid foundation for the precise separation of blood components. In the design of the filter cartridge 13, a filter screen material with a special pore size is selected, which can accurately screen blood components, ensure the separation effect of platelets and white blood cells, and at the same time minimize the impact on platelet activity and improve the platelet recovery rate.

[0021] A jacking component for jacking up the separation cylinder 12 after the cover plate is opened is installed on the separation cylinder 12. The jacking component includes a positioning spring 24 installed between the separation cylinder and the outer cover; the positioning spring 24 is made of a high-quality alloy material with high elasticity and fatigue resistance, and has a stable and lasting elastic restoring force. In actual use, when the cover plate is opened and the downward pressure restriction on the separation cylinder 12 is released, the positioning spring 24 quickly releases its elastic potential energy and pushes the separation cylinder 12 to move up smoothly. This design provides great convenience for injecting new blood into the filter cartridge 13 later, effectively shortening the operation cycle and improving work efficiency.

[0022] A discharge assembly for discharging white blood cells is installed on the separation cylinder 12. The discharge assembly includes a sealing plug 21 inserted at the bottom of the separation cylinder, a cavity 22 formed in the separation cylinder 12, and when the separation cylinder 12 moves, it drives the sealing plug 21 to be inserted into the cavity 22 to complete the discharging operation; when the separation cylinder 12 moves according to a predetermined program, it can accurately drive the sealing plug 21 to be inserted into the cavity 22, instantly opening the discharging channel to complete the efficient discharging operation of white blood cells. This design effectively avoids the leakage risk during the discharge of white blood cells, ensures the safety and hygiene of the operating environment, and at the same time ensures the thorough discharge of white blood cells, reduces residues, and improves the separation purity.

[0023] A collection assembly for collecting platelets is installed inside the outer cover 1. The collection assembly includes a rocker arm 29. One end of the rocker arm 29 is connected to a scraper 27 that slides vertically inside the outer cover 1, and the other end of the rocker arm 29 is lapped on a lifting plate 34 installed on the side wall of the separation cylinder 12. When the separation cylinder 12 moves, it drives the scraper 27 to move smoothly down along the inner wall of the outer cover 1 to achieve the comprehensive collection of platelets. The scraper 27 is made of a flexible and adsorbent special material, which can not only efficiently collect platelets but also avoid scratching the inner wall of the outer cover, ensuring the long-term stable operation of the device, improving the integrity of platelet collection, and reducing losses.

[0024] As Figures 1 to 6 shown, in the specific implementation, four support legs 6 are installed at the bottom corners of the outer cover 1 to provide a stable and reliable support for the device. A base plate 7 is installed at the bottom of the four support legs 6. The base plate 7 is frustum-shaped, effectively increasing the contact area with the placement plane, enhancing the stability of the device, and preventing shaking or displacement during operation. A lifting ring 4 is installed on the side wall of the outer cover 1, and an observation window 5 is provided on the outer cover 1. Scale lines are engraved on the observation window 5, and the operator can directly observe the blood separation situation inside the device in real time, accurately control the operation process, and ensure that the separation effect meets the expected standards.

[0025] As Figures 1 to 6 shown, further, a soft pad is provided at the connection between the cover plate 2 and the outer cover 1. The soft pad is made of a rubber material with excellent sealing performance and aging resistance, effectively enhancing the sealing performance of the device, preventing blood volatilization or entry of external impurities, ensuring the purity of the blood separation environment, and an installation plate 3 is installed on the side wall of the cover plate 2 and the outer cover 1. A locking bolt is installed inside the installation plate 3. A turntable 14 is rotatably installed at the bottom of the cover plate 2, and a sealing gasket 15 is installed on the turntable 14. The sealing gasket 15 fits on the surfaces of the separation cylinder 12 and the filter cylinder 13. The sealing gasket 15 is made of a high-elasticity and wear-resistant silicone material, which can closely fit on the surfaces of the separation cylinder 12 and the filter cylinder 13, further improving the sealing performance inside the device and ensuring that the blood separation process is not interfered by the outside. Embodiment

[0026] Based on Embodiment 1, the difference from this embodiment is: AsFigures 1 to 6 As shown, a transmission shaft 9 is installed at the output end of the drive motor 8. The transmission shaft 9 movably penetrates through the bottom of the outer cover 1, and a cross shaft 10 is installed at the end of the transmission shaft 9. A plug shaft 11 is inserted into the side wall of the cross shaft 10, and the plug shaft 11 is installed at the bottom of the separation cylinder 12.

[0027] As Figures 1 to 6 shown, in the specific implementation manner, a positioning sleeve 25 is installed at the end of the transmission shaft 9. The inner wall of the positioning sleeve 25 is movably inserted with the plug shaft 11. A positioning plate 23 is fixedly installed at the bottom of the separation cylinder 12. A positioning spring 24 is sleeved on the positioning sleeve 25. One end of the positioning spring 24 is clamped on the positioning plate 23, and the other end of the positioning spring 24 is clamped on the end of the positioning sleeve 25. During the operation of the device, after the cover plate is opened, the positioning spring 24 cooperates with the ejecting assembly to push the separation cylinder 12 upward, ensuring the coherence and efficiency of the operation.

[0028] A discharge pipe 17 is installed at the discharge port of the separation cylinder 12. A collection tray 16 is movably inserted on the outer side wall of the discharge pipe 17, and the collection tray 16 is located at the bottom of the separation cylinder 12. A plug rod 20 is installed on the collection tray 16. The plug rod 20 is movably inserted into the discharge pipe 17, and the top of the plug rod 20 is connected to a sealing plug 21. This structural design ensures the accuracy and stability of the relative movement between the sealing plug 21 and the discharge pipe 17, ensuring that white blood cells can flow smoothly and accurately from the separation cylinder 12 through the discharge pipe 17 into the collection tray 16, avoiding leakage and blockage, and improving the reliability and efficiency of the discharging operation.

[0029] As Figures 1 to 6 shown, further, a baffle 18 is installed on the outer side wall of the discharge pipe 17. A return spring 19 is sleeved on the side wall of the discharge pipe 17. One end of the return spring 19 is clamped on the baffle 18, and the other end of the return spring 19 is clamped on the inner wall of the collection tray 16. The return spring 19 can automatically reset the collection tray 16 to the initial position after the white blood cells are discharged, facilitating subsequent operations, improving work efficiency, reducing manual intervention, and lowering labor intensity. A support frame 32 is installed on the side wall of the collection tray 16. A rocker arm 29 is rotatably installed at the top of the support frame 32, and a torsion spring 33 is clamped between the rocker arm 29 and the support frame 32. The torsion spring 33 causes the rocker arm 29 to tend to maintain the initial position when not acted upon by the lifting plate 34, ensuring the structural stability of the device in the non-working state. A strip-shaped groove 30 is opened at the end of the rocker arm 29. A sliding rod 31 is slidably arranged inside the strip-shaped groove 30. Connecting frames 28 are installed at both ends of the sliding rod 31. The connecting frames 28 are connected to the side wall of the scraping plate 27. A collection hopper 26 is installed at the bottom of the outer cover 1, and the collection hopper 26 is located below the scraping plate 27. Through such a structural design, the automation and precision of the platelet collection process can be achieved, improving the platelet collection efficiency and quality.

[0030] The implementation principle of the disposable whole blood collection and PRP leukocyte filtration device of the present invention is as follows: When separating, the operator first allows the whole blood to flow into the inside of the filter cylinder 13, and then the operator seals the whole outer cover 1 through the cover plate 2. The gasket 15 on the cover plate 2 seals the filter cylinder 13 and the separation cylinder 12. Then the operator starts the drive motor 8. At this time, the drive motor 8 can drive the separation cylinder 12 and the filter cylinder 13 to rotate. During the rotation, platelets and white blood cells can be separated from the filter cylinder 13 into the separation cylinder 12 by centrifugal force. With continuous rotation, at this time, platelets can be filtered out of the separation cylinder 12, and then the platelets can be separated into the side wall of the outer cover 1, finally completing the separation of white blood cells and platelets. Among them, white blood cells are located inside the separation cylinder 12, and platelets are located on the inner wall of the outer cover 1.

[0031] After the separation is completed, the operator opens the cover plate 2. After the separation is completed, at this time, under the action of the positioning spring 24, the separation cylinder 12 will be lifted upward. One end of the positioning spring 24 is clamped on the positioning plate 23, and the other end is clamped on the end of the positioning sleeve 25. After the cover plate 2 is opened and the downward pressure restriction on the separation cylinder 12 is lost, the positioning spring 24 begins to release its elastic potential energy, and then pushes the separation cylinder 12 to move upward along the internal space of the outer cover 1, thus facilitating the injection of new blood into the filter cylinder 13 in the separation cylinder 12 in the later stage.

[0032] As the separation cylinder 12 moves upward, the separation cylinder 12 drives the sealing plug 21 to move upward and plug into the cavity 22. The sealing plug 21 at the bottom of the separation cylinder 12 originally seals the discharge port of the separation cylinder 12. When the separation cylinder 12 moves upward, the sealing plug 21 moves upward synchronously until it plugs into the cavity 22 opened on the separation cylinder 12. At this time, the inside of the separation cylinder 12 is communicated with the discharge pipe 17, and the white blood cells inside the separation cylinder 12 can be discharged into the collection tray through the discharge pipe 17, completing the unloading operation of white blood cells. The collection tray 16 is provided with a plug rod 20, and the plug rod 20 is movably inserted into the discharge pipe 17, and the top of the plug rod 20 is connected to the sealing plug 21. Such a structural design ensures the stability of the relative movement between the sealing plug 21 and the discharge pipe 17, and also enables the white blood cells to flow smoothly from the separation cylinder 12 through the discharge pipe 17 into the collection tray 16.

[0033] Meanwhile, the upward movement of the separation cylinder 12 drives the lifting plate 34 to move upward, and the upward movement of the lifting plate 34 pushes the rocker arm 29 to rotate. The lifting plate 34 installed on the side wall of the separation cylinder 12 moves upward synchronously with the separation cylinder 12. During the upward movement of the lifting plate 34, it contacts one end of the rocker arm 29 and applies an upward thrust to it. One end of the rocker arm 29 is connected to the scraper 27 that slides vertically inside the outer cover 1, and the other end is lapped on the lifting plate 34. Under the upward thrust of the lifting plate 34, the rocker arm 29 rotates around its rotation connection point with the support frame 32. A torsion spring 33 is clamped between the rocker arm 29 and the support frame 32. The torsion spring 33 causes the rocker arm 29 to tend to maintain its initial position when not acted upon by the lifting plate 34, but when the upward acting force of the lifting plate 34 is sufficient to overcome the resistance of the torsion spring 33, the rocker arm 29 begins to rotate.

Claims

1. A disposable whole blood collection and PRP leukocyte filtration device, comprising an outer cover (1) and a cover plate (2) rotatably connected thereto, characterized in that: A driving motor (8) is installed on the outer cover (1), the output end of the driving motor (8) is inserted with a separation cylinder (12), and a filter cylinder (13) is installed inside the separation cylinder (12); A jacking component for jacking up the separation cylinder (12) to move upward after the cover plate is opened is installed on the separation cylinder (12), and the jacking component includes a positioning spring (24) installed between the separation cylinder and the outer cover; A discharging component for discharging white blood cells is installed on the separation cylinder (12), the discharging component includes a sealing plug (21) inserted at the bottom of the separation cylinder, a cavity (22) is opened on the separation cylinder (12), and after the separation cylinder (12) moves, the sealing plug (21) is driven to be inserted into the cavity (22) to complete the discharging operation; A collection component for collecting platelets is installed inside the outer cover (1), the collection component includes a rocker arm (29), one end of the rocker arm (29) is connected to a scraper (27) sliding vertically inside the outer cover (1), and the other end of the rocker arm (29) is lapped on a lifting plate (34) installed on the side wall of the separation cylinder (12). After the separation cylinder (12) moves, the scraper (27) is driven to move down along the outer cover (1) to complete the collection operation.

2. The disposable whole blood collection and PRP separation leukocyte filtration device according to claim 1, characterized in that, Four support legs (6) are installed at the bottom corners of the outer cover (1), a base plate (7) is installed at the bottom of the four support legs (6), the base plate (7) is frustum-shaped, a lifting ring (4) is installed on the side wall of the outer cover (1), an observation window (5) is provided on the outer cover (1), and scale lines are engraved on the observation window (5).

3. The disposable whole blood collection and PRP leukocyte filtration device according to claim 1, characterized in that, A soft pad is provided at the connection between the cover plate (2) and the outer cover (1), and mounting plates (3) are installed on the side walls of the cover plate (2) and the outer cover (1). Locking bolts are installed inside the mounting plates (3). A turntable (14) is rotatably installed at the bottom of the cover plate (2), a sealing gasket (15) is installed on the turntable (14), and the sealing gasket (15) fits on the surfaces of the separation cylinder (12) and the filter cylinder (13).

4. The disposable whole blood collection and PRP separation leukocyte filtration device according to claim 1, characterized in that, A transmission shaft (9) is installed at the output end of the driving motor (8), the transmission shaft (9) movably penetrates through the bottom of the outer cover (1), and a cross shaft (10) is installed at the end of the transmission shaft (9). A plug shaft (11) is inserted on the side wall of the cross shaft (10), and the plug shaft (11) is installed at the bottom of the separation cylinder (12).

5. The disposable whole blood collection and PRP filtration and leukocyte removal device according to claim 4, wherein A positioning sleeve (25) is installed at the end of the transmission shaft (9), the inner wall of the positioning sleeve (25) is movably inserted with the plug shaft (11), a positioning plate (23) is fixedly installed at the bottom of the separation cylinder (12), a positioning spring (24) is sleeved on the positioning sleeve (25), one end of the positioning spring (24) is clamped on the positioning plate (23), and the other end of the positioning spring (24) is clamped on the end of the positioning sleeve (25).

6. The disposable whole blood collection and PRP separation leukocyte filtration device according to claim 1, wherein A discharge pipe (17) is installed at the discharge port of the separation cylinder (12). A collection tray (16) is movably inserted on the outer side wall of the discharge pipe (17), and the collection tray (16) is located at the bottom of the separation cylinder (12). A plug rod (20) is installed on the collection tray (16). The plug rod (20) is movably inserted into the discharge pipe (17), and the top of the plug rod (20) is connected to a sealing plug (21).

7. The disposable whole blood collection and PRP leukocyte filtration device according to claim 6, wherein A baffle (18) is installed on the outer side wall of the discharge pipe (17). A return spring (19) is sleeved on the side wall of the discharge pipe (17). One end of the return spring (19) is clamped on the baffle (18), and the other end of the return spring (19) is clamped on the inner wall of the collection tray (16).

8. The disposable whole blood collection and PRP filtration and leukocyte removal device according to claim 6, wherein A support frame (32) is installed on the side wall of the collection tray (16). A rocker arm (29) is rotatably installed at the top of the support frame (32), and a torsion spring (33) is clamped between the rocker arm (29) and the support frame (32). A strip-shaped groove (30) is formed at the end of the rocker arm (29). A sliding rod (31) is slidably arranged inside the strip-shaped groove (30). Connecting frames (28) are installed at both ends of the sliding rod (31). The connecting frames (28) are connected to the side wall of a scraper (27). A collection hopper (26) is installed at the bottom of the outer cover (1), and the collection hopper (26) is located below the scraper (27).

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