Bearing ring decontamination cleaning device for bearing production

Abstract

The invention relates to the technical field of bearing production, and discloses a bearing ring decontaminating and cleaning device for bearing production, which comprises a barrel, and a bearing assembly which forms a cleaning interlayer space together with the inner wall of the barrel and is used for carrying out low-loss cleaning on a bearing ring is rotationally mounted at the axis of the bottom end of the inner wall of the barrel. According to the equipment, through a cleaning interlayer space formed by a top water inlet pipe, a reducing section, an expanding section and a conical seat, a conical head and a bearing ring piece, high-speed rotational flow is formed at the reducing section through acceleration of tangential inlet water, a bearing ring arranged on the bearing ring piece in a sleeving mode is subjected to all-dimensional non-contact washing in the cleaning interlayer space, meanwhile, the rotational flow impacts a rotary vane to drive the conical seat to rotate in the forward direction, and the bearing ring is cleaned. The conical head and the bearing ring are driven to rotate synchronously through clamping fit of the spiral threads and the spiral pipe cavity, the peeling capacity of a roller path groove is enhanced through turbulent flow formed by a rotating workpiece and rotational flow, low-damage cleaning replacing a rigid brush is achieved, damage to an inner ring is reduced, and the surface precision, the use stability and the service life of the bearing ring are guaranteed.

Description

A bearing ring cleaning device for bearing production Technical Field

[0001] This invention relates to the field of bearing manufacturing technology, and in particular to a bearing ring cleaning and decontamination device for bearing manufacturing. Background Technology

[0002] As a core component of rolling bearings, the surface cleanliness of bearing rings after machining directly determines the bearing's rotational accuracy, noise level, and service life. After heat treatment and grinding, bearing rings retain impurities such as quenching oil, grinding debris, and metal powder on their surface and in the raceway grooves. Thorough cleaning is essential before proceeding to subsequent assembly processes. Currently, the industry primarily uses mechanical brush cleaning devices for cleaning bearing rings. These devices typically include a conveying mechanism, a spraying mechanism, and multiple sets of rigid brush rollers. Through direct contact friction between the brush rollers and the bearing ring surface, combined with the spraying and rinsing of cleaning fluid, the outer surface and end faces of the bearing rings are cleaned. In addition, the industry also utilizes ultrasonic cleaning or high-temperature liquid rinsing for cleaning bearing rings.

[0003] However, the above-mentioned equipment still has the following shortcomings: In the traditional mechanical brush cleaning method, because the bearing ring raceway groove is a concave arc structure and the surface precision requirement is high, the brush will inevitably generate hard contact friction when it is inserted into the raceway for cleaning. It is very easy to leave fine scratches on the inner ring and raceway working surface, which will become stress concentration points in subsequent operation. In addition, in order to remove stubborn dirt in the micro-texture of the raceway, the brushing force needs to be increased, which further aggravates the inherent contradiction between cleaning effect and workpiece damage. Although ultrasonic cleaning can achieve non-contact cleaning, the energy of ultrasonic waves is severely attenuated in the deep concave raceway groove, making it difficult to completely remove metal debris and carbon deposits embedded in the micro-texture. Moreover, the oil stains that are removed from the workpiece after cleaning are easily suspended in the cleaning fluid, which can easily cause secondary pollution when the workpiece is removed. The high-temperature liquid rinsing method requires heating the cleaning fluid to a high temperature, which consumes a lot of energy and the high-temperature medium may affect the stability of the metallographic structure of the bearing ring after heat treatment. At the same time, the effect of simply relying on the liquid impact force to peel off stubborn dirt in the raceway groove is limited, which is difficult to meet the high cleanliness requirements. Summary of the Invention

[0004] To address the shortcomings mentioned above, this invention proposes a bearing ring cleaning and decontamination device for bearing production.

[0005] To achieve the above objectives, this application adopts the following technical solution: a bearing ring cleaning device for bearing production, comprising a cylindrical body, wherein a support component is rotatably installed at the bottom axis of the inner wall of the cylindrical body, forming a cleaning interlayer space together with the inner wall of the cylindrical body, and used for low-damage cleaning of the bearing ring; the cylindrical body is composed of a top section, a constricting section, a waist section, an expanding section, and a bottom section, wherein the constricting section and the expanding section, as well as the top section and the bottom section, are symmetrically arranged vertically, and the inner diameter of the top port of the constricting section is larger than the inner diameter of the bottom port. The expanded diameter section is the opposite; the supporting assembly includes a conical seat rotatably mounted at the axial position inside the bottom section, a lifting rod fixed at the axial position on the upper surface of the conical seat, multiple sets of rotating blades fixedly mounted in an equiangular array around the axis on the curved outer wall of the conical seat, a conical head movably sleeved on the outer wall of the lifting rod, and multiple sets of receiving ring plates fixed at equal intervals from top to bottom on the outer wall of the conical head; a top water inlet pipe for connecting to external cleaning water is fixed on the side wall of the top section, and a drain pipe is fixed on the curved outer wall of the bottom section below the conical seat.

[0006] Preferably, the outer wall of the lifting rod is fixed with multiple sets of spiral patterns arranged in an equiangular array around the axis, and the inside of the cone head has a spiral cavity of matching size and shape at the contact position with the lifting rod and the spiral patterns.

[0007] Preferably, the outer wall of the cone seat and the inner wall of the expansion section together form a cone-shaped cleaning interlayer space. The top of the top section is provided with a feed inlet for feeding materials, and the upper surface of the feed inlet is sealed with a splash guard. The bottom of the bottom section is provided with a backwash port for introducing external cleaning water.

[0008] Preferably, the top water inlet pipe is connected to the tangential part of the top section, and the central axis of the top water inlet pipe forms a certain angle with the tangential part of the top section. The inner wall of the tapering section is fixed with multiple sets of threads at equal angles to enhance the swirling intensity of the external cleaning water.

[0009] Preferably, a suspension bracket is fixed at the inner wall axis of the bottom section, and the cone seat is rotatably installed at the center of the suspension bracket. The bottom of the cone seat is in the shape of an inverted cone, the cone head is in the shape of a cone, and the top is inserted into the waist section. The inside of the cone head is a hollow structure.

[0010] Preferably, the outer diameter of each set of receiving rings increases from top to bottom, and the corners of the receiving rings are fitted with silicone sleeves, and the corners of the silicone sleeves are rounded and chamfered.

[0011] Preferably, the axial height of the bottom section is greater than the axial height of the converging section, and a water inlet pipe is fixedly installed on the inner wall of the bottom section below the drain pipe. The water inlet pipe has a through structure, and the inner diameter of the top port of the water inlet pipe is smaller than the inner diameter of the bottom port.

[0012] Preferably, a double-ended pipe is installed at the end of the top water inlet pipe away from the top section, and the top water inlet pipe is connected to an external water supply device and a temporary water storage tank through two sets of interfaces of the double-ended pipe.

[0013] Preferably, the end of the backflush port away from the bottom section is connected to another set of double-pass pipes, and the two sets of interfaces of the double-pass pipes are respectively connected to another set of external water supply equipment and temporary water storage tank.

[0014] Preferably, the end of the pipe away from the bottom section is connected to an external filter device, the side wall of the waist section is hinged with a cover plate, and the corners of the cover plate are all equipped with seals. A discharge conveying system is provided at the corresponding position on the outer wall of the cover plate, and the outer wall of the multiple sets of receiving rings is fitted with bearing rings.

[0015] The technical effects and advantages of this invention are as follows: In this invention, the equipment, through the cleaning interlayer space formed by the top water inlet pipe, the converging section, the expanding section, and the cone seat, the cone head, and the receiving ring plate, utilizes tangential water inlet to accelerate and form a high-speed swirling flow in the converging section. Within the cleaning interlayer space, the bearing ring fitted on the receiving ring plate is subjected to all-round non-contact rinsing. At the same time, the swirling flow impacts the blades, driving the cone seat to rotate in the forward direction. Through the locking fit between the spiral groove and the spiral cavity, the cone head and the bearing ring rotate synchronously. The turbulence formed by the rotating workpiece and the swirling flow enhances the peeling ability of the raceway groove, achieving low-damage cleaning that replaces rigid brushes, reducing damage to the inner ring, and ensuring the surface accuracy, operational stability, and service life of the bearing ring.

[0016] In this invention, the equipment utilizes a backflush port at the bottom, a water inlet pipe, an inverted conical surface at the bottom of the cone seat, a lifting rod, and a spiral groove that engages with the spiral cavity of the cone head, along with a receiving ring and a cover plate. After cleaning, reverse water inlet is accelerated through the water inlet pipe to form an upward jet that impacts the cone seat and causes it to rotate in the opposite direction. Simultaneously, the upward water flow generates an upward thrust thanks to the large surface area of ​​the receiving ring and the hollow buoyancy of the cone head. This thrust is reinforced by the lifting force generated when the spiral groove reverses, causing the cone head to drive the bearing ring to rotate smoothly and rise to the waist section. Subsequently, the cover plate is opened to push the bearing ring out to the discharge conveyor system, achieving automatic discharge without rigid contact, avoiding secondary damage, and ensuring the processing quality of the bearing ring throughout the entire process. Attached Figure Description

[0017] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals refer to the same components: Figure 1 is a schematic diagram of the main external structure of this invention; Figure 2 is a cross-sectional schematic diagram of the cylinder of this invention; Figure 3 is a cross-sectional planar schematic diagram of the cylinder of this invention; Figure 4 is a partial structural disassembly and cross-sectional schematic diagram of this invention; Figure 5 is a cross-sectional planar schematic diagram of the internal structure of this invention in the discharge state; Figure 6 is a schematic diagram of the cone head and cone seat structure of this invention.

[0018] Legend: 1. Cylinder; 11. Top section; 12. Reducing diameter section; 13. Waist section; 14. Expanding diameter section; 15. Bottom section; 2. Support assembly; 21. Conical seat; 22. Lifting rod; 221. Spiral pattern; 23. Rotary blade; 24. Conical head; 241. Spiral cavity; 25. Receiving ring; 3. Top water inlet pipe; 4. Pipeline; 5. Water inlet pipe; 6. Bearing ring; 7. Cover plate. Detailed Implementation

[0019] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0020] Referring to Figures 1-6, the present invention provides a technical solution: a bearing ring cleaning device for bearing production, comprising a cylindrical body 1, wherein a support component 2 is rotatably installed at the bottom axis of the inner wall of the cylindrical body 1, forming a cleaning interlayer space together with the inner wall of the cylindrical body 1, and used for low-damage cleaning of the bearing ring 6; the cylindrical body 1 is composed of a top section 11, a constricting section 12, a waist section 13, an expanding section 14, and a bottom section 15, wherein the constricting section 12 and the expanding section 14, the top section 11 and the bottom section 15 are symmetrically arranged vertically, the inner diameter of the top port of the constricting section 12 is larger than the inner diameter of the bottom port, the expanding section 15... The opposite is true for section 14; the supporting assembly 2 includes a cone seat 21 rotatably mounted at the axial position inside the bottom section 15, a lifting rod 22 fixed at the axial position on the upper surface of the cone seat 21, multiple sets of rotating blades 23 fixedly mounted in an equiangular array around the axis on the curved outer wall of the cone seat 21, a cone head 24 movably sleeved on the outer wall of the lifting rod 22, and multiple sets of receiving ring plates 25 fixed at equal intervals from top to bottom on the outer wall of the cone head 24; a top water inlet pipe 3 for connecting to external cleaning water is fixed on the side wall of the top section 11, and a drain pipe 4 is fixed on the curved outer wall of the bottom section 15 below the cone seat 21.

[0021] Referring to Figures 4-6, in this embodiment: the outer wall of the lifting rod 22 is fixed with multiple sets of spiral patterns 221 arranged in an equiangular array around the axis. The interior of the cone head 24 has a spiral cavity 241 with matching size and shape at the contact position with the lifting rod 22 and the spiral patterns 221. When the cleaning vortex flows from top to bottom, the impact vane 23 drives the cone head 24 to rotate forward. At this time, the spiral patterns 221 and the spiral cavity 241 are locked, ensuring that the cone seat 21 drives the cone head 24 to rotate together. Reversing the flow is the opposite. The upward backwash water flow, combined with the buoyancy of the cone head 24 and the receiving ring 25 with a large surface area, generates an upward "pull force". The upward "pull force" and the "lifting force" generated when the lifting rod 22 and the spiral patterns 221 reverse the flow reinforce each other, thereby driving the cone head 24 and the bearing ring 6 to move upward into the waist section 13, which is convenient for subsequent material discharge.

[0022] Referring to Figures 2-5, in this embodiment: the outer wall of the cone seat 21 and the inner wall of the expansion section 14 together form a cone-shaped cleaning interlayer space. The top of the top section 11 is provided with a feed inlet for feeding, and the upper surface of the feed inlet is sealed with a splash guard to prevent backwash water from splashing out. The bottom of the bottom section 15 is provided with a backwash port for introducing external cleaning water.

[0023] Referring to Figures 1-5, in this embodiment: the top water inlet pipe 3 is connected to the tangential part of the top section 11, and the central axis of the top water inlet pipe 3 forms a certain angle with the tangential part of the top section 11. The cleaning water introduced tangentially enters the inner wall of the top section 11 and flows along its inner wall. The inner wall of the converging section 12 is fixed with multiple sets of threads at equal angles to enhance the swirling intensity of the external cleaning water.

[0024] Referring to Figures 2-5, in this embodiment: a suspension bracket is fixed at the inner wall axis of the bottom section 15, and the cone seat 21 is rotatably installed at the center of the suspension bracket. The bottom of the cone seat 21 is inverted cone shape. This structure evenly diffuses the backwash water flow, causing it to surge upwards into the cavity inside the expansion section 14. The cone head 24 is cone-shaped, and its top is inserted into the waist section 13. The inside of the cone head 24 is hollow, which can effectively reduce its own weight, enhance its buoyancy under the action of backwash water flow, and reduce the load requirements on the screw drive of the lifting rod 22. At the same time, its hollow structure can also adjust the water flow channel in real time during the cleaning process (specifically, adjust the flow channel), further disturbing the flow field near the inner ring of the bearing ring 6 and the raceway groove, improving the cleaning effect of the cleaning water, and enhancing the flushing effect on stubborn stains.

[0025] Referring to Figures 2-6, in this embodiment: the outer diameter of each set of receiving rings 25 increases from top to bottom, which can accommodate bearing rings 6 with different inner diameters, thus expanding the applicability of the equipment. The edges and corners of the receiving rings 25 are fitted with silicone sleeves, which can prevent the bearing rings 6 from being damaged or deformed due to excessive impact force when they fall. The edges and corners of the silicone sleeves are rounded and chamfered, which can reduce the resistance of the edges and corners to the bearing rings 6 during the fall and prevent jamming.

[0026] Referring to Figures 2-5, in this embodiment: the axial height of the bottom section 15 is greater than the axial height of the converging section 12, and a water inlet pipe 5 is fixedly installed on the inner wall of the bottom section 15 and below the drain pipe 4. The water inlet pipe 5 has a through structure, and the inner diameter of the top port of the water inlet pipe 5 is smaller than the inner diameter of the bottom port.

[0027] Referring to Figures 1-5, in this embodiment: a double-pass pipe is installed at the end of the top water inlet pipe 3 away from the top section 11, and the top water inlet pipe 3 is connected to an external water supply device and a temporary water storage tank through two sets of interfaces of the double-pass pipe.

[0028] Referring to Figures 1-5, in this embodiment: the end of the backflush port away from the bottom section 15 is connected to another set of double-pass pipes, and the two sets of interfaces of the double-pass pipes are respectively connected to another set of external water supply equipment and temporary water storage tank.

[0029] Referring to Figures 1-5, in this embodiment: the end of the drain pipe 4 away from the bottom section 15 is connected to an external filter equipment; the side wall of the waist section 13 is hinged with a cover plate 7, and the corners of the cover plate 7 are all equipped with seals; a discharge conveying system is provided at the corresponding position on the outer wall of the cover plate 7; and bearing rings 6 are sleeved on the outer wall of multiple sets of receiving rings 25.

[0030] Working principle: First, the bearing ring 6 to be cleaned is placed into the feed port of the top section 11. The bearing ring 6 slides onto the receiving ring 25 on the outer wall of the cone head 24. During the sliding process, a small amount of water is released through the flow control valve in the top water inlet pipe 3. The micro-vortex generated by the small amount of water lubricates the sliding bearing ring 6, reducing the probability of scratches on the bearing ring 6. Furthermore, because the outer diameter of the receiving ring 25 increases from top to bottom and the edges are fitted with silicone rings, the bearing ring 6 is stably supported and avoids hard contact, further preventing scratches on the surface of the bearing ring 6 during the initial placement process.

[0031] Meanwhile, the cone head 24 and multiple sets of bearing rings 25 with increasing outer diameters can be used for bearing rings 6 with different inner diameters, thus expanding the applicability of the equipment.

[0032] Secondly, the external water supply equipment is activated, and the cleaning water enters the top section 11 tangentially from the top inlet pipe 3. Since the top inlet pipe 3 is tangentially connected to the top section 11, the water forms a high-speed rotating vortex in the top section 11. When the vortex flows downward through the converging section 12, the cross-sectional area of ​​the flow channel gradually decreases because the inner diameter of the top of the converging section 12 is larger than the inner diameter of the bottom. The water flow velocity further increases. At the same time, the threads on the inner wall of the converging section 12 enhance the rotation intensity of the vortex, providing high-energy fluid for subsequent efficient cleaning and ensuring the impact force on dead corners such as the raceway groove.

[0033] Secondly, the high-speed swirling flow enters the cleaning interlayer space formed by the inner wall of the expansion section 14 and the outer wall of the cone seat 21. Within this space, the swirling flow performs a comprehensive, non-contact cleaning of the outer ring, inner ring, end face, and raceway grooves of the bearing ring 6 fitted on the receiving ring 25. It utilizes fluid shear force to remove oil and debris, replacing the rigid brushes in existing bearing ring 6 cleaning equipment. Only the water flow is used for low-damage cleaning of the inner ring of the bearing ring 6, reducing damage to the inner ring. Simultaneously, the swirling flow impact vane 23 drives the cone seat 21 to rotate forward. The cone seat 21, through the lifting rod 22 and the spiral groove 221, connects to the spiral cavity 2 of the cone head 24. 41. When the spiral pattern 221 is in a locked state with the inner wall of the spiral cavity 241, the cone head 24 drives the bearing ring 6 to rotate during the cleaning process. The rotating bearing ring 6, together with the swirling flow in the cleaning interlayer space, forms turbulence, further enhancing the cleaning intensity. This completely solves the problem of damage to the inner ring and scratches caused by traditional brushing methods, reducing the impact of the cleaning process on the accuracy of the inner ring of the bearing ring 6. Then, the impurities generated during the cleaning process enter the lower part of the expansion section 14 with the swirling flow. As the inner diameter of the expansion section 14 gradually increases, the flow velocity decreases, and the impurities are thrown off by centrifugal force. The water is discharged to the external filter equipment through the drain pipe 4, achieving simultaneous cleaning and sludge removal to prevent secondary pollution. Next, after cleaning, the water inlet pipe 3 at the top is closed, and another set of external water supply equipment connected to the backwash port of the bottom section 15 is activated. The cleaning water enters from the backwash port and flows upwards. When the water passes through the water inlet pipe 5, because the inner diameter of the top port of the water inlet pipe 5 is smaller than the inner diameter of the bottom port, an accelerated jet is formed, impacting the inverted conical surface at the bottom of the cone seat 21, driving the cone seat 21 to rotate in the opposite direction. Simultaneously, the water flows upwards into the cleaning interlayer space, and the upward-flowing water is pushed by the multiple sets of receiving ring plates 25. The cone 24 moves upward (the surface area of ​​the multiple sets of receiving rings 25 is large, and the interior of the cone 24 is hollow, so it has a certain buoyancy), and then rotates and rises smoothly under the guidance of the spiral pattern 221 and the spiral cavity 241. The receiving rings 25 drive the bearing ring 6 to rise together to the height of the waist section 13. Then, the cover plate 7 on the side wall of the waist section 13 is opened, and the bearing ring 6 is discharged from the device at the cover plate 7 under the push of the subsequent water flow. The bearing ring 6 is carried to the next process by the discharge conveyor system installed at the cover plate 7, completing the entire cleaning process. The entire discharge process also has no rigid contact to avoid secondary damage.

[0034] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A bearing ring cleaning and decontamination device for bearing production, characterized in that, The device includes a cylindrical body, on which a support assembly is rotatably mounted at the bottom axis of the inner wall of the cylindrical body. This assembly, together with the inner wall of the cylindrical body, forms a cleaning interlayer space and is used for low-damage cleaning of bearing rings. The cylindrical body is composed of a top section, a converging section, a waist section, an expanding section, and a bottom section. The converging and expanding sections, as well as the top and bottom sections, are symmetrically arranged vertically. The inner diameter of the top port of the converging section is larger than that of the bottom port, and vice versa for the expanding section. The support assembly includes a conical seat rotatably mounted at the inner axis of the bottom section. A lifting rod is fixed at the axial position of the upper surface of the conical seat. Multiple sets of rotating blades are fixedly arranged in an equiangular array around the axis on the curved outer wall of the conical seat. A conical head is movably sleeved on the outer wall of the lifting rod. Multiple sets of receiving ring plates are fixedly fixed at equal intervals from top to bottom on the outer wall of the conical head. A top water inlet pipe for connecting to external cleaning water is fixed on the side wall of the top section. A drain pipe is fixed on the curved outer wall of the bottom section below the conical seat.

2. The bearing ring cleaning and decontamination device for bearing production according to claim 1, characterized in that: The outer wall of the lifting rod is fixed with multiple sets of spiral patterns arranged in an equiangular array around the axis, and a spiral cavity with matching size and shape is opened at the contact position between the cone head and the lifting rod and the spiral patterns.

3. The bearing ring cleaning and decontamination device for bearing production according to claim 1, characterized in that: The outer wall of the cone seat and the inner wall of the expansion section together form a cone-shaped cleaning interlayer space. The top of the top section has a feed port for feeding materials, and the upper surface of the feed port is sealed with a splash guard. The bottom of the bottom section has a backwash port for introducing external cleaning water.

4. The bearing ring cleaning and decontamination device for bearing production according to claim 1, characterized in that: The top water inlet pipe is connected to the tangential part of the top section, and the central axis of the top water inlet pipe forms a certain angle with the tangential part of the top section. The inner wall of the tapering section is fixed with multiple sets of threads at equal angles to enhance the swirling intensity of the external cleaning water.

5. A bearing ring cleaning and decontamination device for bearing production according to claim 1, characterized in that: A suspension bracket is fixed at the inner wall axis of the bottom section, and the cone seat is rotatably installed at the center of the suspension bracket. The bottom of the cone seat is in the shape of an inverted cone, the cone head is in the shape of a cone, and the top is inserted into the waist section. The inside of the cone head is a hollow structure.

6. The bearing ring cleaning and decontamination device for bearing production according to claim 1, characterized in that: The outer diameter of each set of receiving rings increases from top to bottom, and the corners of the receiving rings are fitted with silicone sleeves with rounded chamfers.

7. A bearing ring cleaning and decontamination device for bearing production according to claim 1, characterized in that: The axial height of the bottom section is greater than that of the converging section. A water inlet pipe is fixedly installed on the inner wall of the bottom section below the drain pipe. The water inlet pipe has a through structure, and the inner diameter of the top port of the water inlet pipe is smaller than that of the bottom port.

8. A bearing ring cleaning and decontamination device for bearing production according to claim 1, characterized in that: The top water inlet pipe is connected to a double-pipe at the end furthest from the top section, and the top water inlet pipe is connected to an external water supply device and a temporary water storage tank through the two sets of interfaces of the double-pipe.

9. A bearing ring cleaning and decontamination device for bearing production according to claim 3, characterized in that: The backflush port is connected to another set of double-pipes at the end away from the bottom section, and the two sets of interfaces of the double-pipes are respectively connected to another set of external water supply equipment and temporary water storage tank.

10. A bearing ring cleaning and decontamination device for bearing production according to claim 1, characterized in that: The end of the pipe away from the bottom section is connected to an external slag filter. The side wall of the waist section is hinged with a cover plate, and the corners of the cover plate are all equipped with seals. A discharge conveying system is set at the corresponding position on the outer wall of the cover plate. The outer walls of multiple sets of receiving rings are fitted with bearing rings.

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