An oil-free lubrication driving method and filter cloth driving mechanism of a filter cloth walking pressure filter

Abstract

The application discloses a kind of filter cloth walking filter press oil-free lubrication driving method and filter cloth driving mechanism, belong to filter cloth walking filter press technical field, at least filter cloth driving mechanism of filter cloth walking filter press, one or both of sprocket and chain are made of self-lubricating material at least in the part of mutual contact of two;One or both of guide wheel and chain are made of self-lubricating material at least in the part of mutual contact of two;One or both of driving bevel gear and driven bevel gear are made of self-lubricating material at least in the part of mutual contact of two.It is discarded that two non-self-lubricating metal transmission components contact or meshing mode, on the one hand, without adding butter and the like lubricating grease to lubricate, eliminate lubricating grease drop, avoid lubricating grease to contaminate food or drug and the like raw materials and finished products, on the other hand, avoid the pollution caused by metal iron filings and the like, eliminate safety hazard, to meet the oil-free, clean production use requirement of food-grade filter press equipment.

Description

Technical Field

[0001] This invention relates to the field of filter cloth walking filter press technology, and in particular to an oil-free lubrication drive method and filter cloth drive mechanism for a filter cloth walking filter press. Background Technology

[0002] Filter presses are one of the most widely used core pieces of equipment in solid-liquid separation processes in industries such as chemical, mineral processing, food, and pharmaceuticals. Among them, cloth-walking filter presses are widely used in production scenarios requiring frequent unloading due to their high degree of automation and low filter cake moisture content. During unloading, the core action of this type of filter press is to drive the filter cloth in a reciprocating "walking" motion between filter plate groups. This utilizes the tension changes within the filter cloth and auxiliary mechanisms such as scrapers to efficiently peel off the filter cake adhering to the filter cloth surface.

[0003] Currently, the drive methods for filter cloth in filter cloth walking filter presses are diverse, mainly including double-sided multi-ribbed bar drive, single-sided multi-ribbed bar drive, middle multi-ribbed bar drive, and independent direct-drive or geared motor drive. Regardless of the drive layout, power transmission and motion conversion heavily rely on gear transmission mechanisms, especially bevel gear pairs or helical gear pairs, to achieve power steering and speed matching from the motor to the drive shaft and filter cloth traction sprocket. Ultimately, through the meshing transmission of the sprocket and chain, the rotational motion is converted into the reciprocating linear motion of the filter cloth suspension device. To ensure smooth operation of transmission components, reduce friction and wear during meshing and rotation, and extend component lifespan, the industry commonly uses grease or similar lubricants to lubricate moving parts such as sprockets and bevel gears. However, during actual equipment operation, factors such as operational vibration, component meshing and compression, and regular oiling can cause the added grease to drip, making it difficult to achieve a leak-free seal. When this type of filter press is used in food processing, pharmaceuticals, and other industries, the dripping grease can directly contact and contaminate food raw materials and finished products, seriously violating relevant food production hygiene and safety regulations and standards, posing significant food safety hazards. Furthermore, grease leakage can also pollute the equipment and working environment, increasing subsequent cleaning and maintenance costs, and failing to meet the oil-free, clean production requirements of food-grade filter presses. Summary of the Invention

[0004] The purpose of this invention is to solve the above-mentioned technical problems and provide an oil-free lubrication drive method and filter cloth drive mechanism for a filter cloth walking filter press. In the two transmission components that are in contact with each other, at least one is a self-lubricating material, which eliminates the metal-to-metal contact method of two non-self-lubricating metal transmission components, avoids the contamination of raw materials and finished products such as food or medicine by grease and metal filings, eliminates safety hazards, and meets the requirements of oil-free and clean production and use of food-grade filter press equipment.

[0005] To achieve the above objectives, the present invention provides the following solution: The present invention discloses an oil-free lubrication drive method for a filter cloth walking filter press, comprising the following steps: In at least the filter cloth drive mechanism of the filter cloth walking filter press, one or both of the sprocket and the chain are made of self-lubricating material at least at the points where they contact each other; one or both of the guide wheel and the chain are made of self-lubricating material at least at the points where they contact each other; and one or both of the drive bevel gear and the driven bevel gear are made of self-lubricating material at least at the points where they contact each other.

[0006] In one embodiment, the self-lubricating material is a food-grade self-lubricating material.

[0007] In one embodiment, any one or more of the sprocket, the chain, the guide wheel, the drive bevel gear, and the driven bevel gear are made of a self-lubricating material, or are made of a metal substrate coated with a self-lubricating material.

[0008] In one embodiment, the rollers of the chain are made of a self-lubricating material, and the chain plates are made of stainless steel or a self-lubricating material.

[0009] In one embodiment, the polygonal rod in the filter cloth driving mechanism is made of food-grade metal material.

[0010] In one embodiment, the hanging rod for hanging the filter cloth in the filter cloth traveling filter press is fixed by hooks.

[0011] This embodiment provides a filter cloth driving mechanism for a filter cloth walking filter press, which includes at least a sprocket, a chain, a guide wheel, a driving bevel gear, and a driven bevel gear. One or both of the sprocket and the chain are made of a self-lubricating material at least at the points where they contact each other; one or both of the guide wheel and the chain are made of a self-lubricating material at least at the points where they contact each other; one or both of the driving bevel gear and the driven bevel gear are made of a self-lubricating material at least at the points where they contact each other.

[0012] In one embodiment, the system further includes a multi-faceted rod, characterized in that the multi-faceted rod is made of food-grade metal material.

[0013] In one embodiment, any one or more of the sprocket, the chain, the guide wheel, the drive bevel gear, and the driven bevel gear are made of a self-lubricating material, or are made of a metal substrate coated with a self-lubricating material.

[0014] The present invention achieves the following technical effects compared to the prior art: In this invention, in the filter cloth drive mechanism of the filter cloth walking filter press, one or both of the contact points between the sprocket and the chain, the contact points between the guide wheel and the chain, and the contact points between the driving bevel teeth and the driven bevel teeth are made of self-lubricating material. This eliminates the metal-to-metal contact method between two non-self-lubricating metal transmission components. On the one hand, it eliminates the need for lubrication with grease or other lubricants, preventing grease dripping and avoiding grease contamination of food or pharmaceutical raw materials and finished products. On the other hand, it avoids contamination caused by metal filings, eliminating safety hazards and meeting the requirements for oil-free and clean production and use of food-grade filter press equipment.

[0015] Other technical solutions of the present invention have achieved the following technical effects compared with the prior art: 1. In this invention, the self-lubricating material is a food-grade self-lubricating material. This avoids the release of toxic monomers that could contaminate food, pharmaceuticals, or filter cloths that come into indirect contact with food.

[0016] 2. In this invention, the multi-faceted rod is made of food-grade metal material, which can avoid the risk of iron filings falling and contaminating food, medicine, etc., making it suitable for food processing or pharmaceutical processing.

[0017] 3. In this invention, the hanging rod for hanging the filter cloth is fixed with a non-metallic hook, which avoids the risk of the nut falling off, as well as the risk of iron filings falling off during the tightening and loosening of metal screws and nuts, thereby contaminating food, medicine, etc. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained by analyzing these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the transmission part (including chain, sprocket, hook, hanging rod, filter cloth and guide wheel) in the filter cloth driving mechanism in an embodiment of the present invention; Figure 2 This is a schematic diagram of the driving part (including driving umbrella teeth, driven umbrella teeth, and polygonal bars) in the filter cloth driving mechanism of this invention.

[0020] Explanation of reference numerals in the attached drawings: 11. Chain; 12. Sprocket; 13. Hook; 14. Hanging rod; 15. Filter cloth; 16. Guide wheel; 21. Drive bevel gear; 22. Driven bevel gear; 23. Multifaceted bar. Detailed Implementation

[0021] 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 analyzed and obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] The purpose of this invention is to provide an oil-free lubrication drive method and filter cloth drive mechanism for a filter cloth walking filter press, in order to solve the problems existing in the prior art. In the two transmission components that are in contact with each other, at least one is a self-lubricating material, which eliminates the metal-to-metal contact method of two non-self-lubricating metal transmission components, avoids the contamination of raw materials and finished products such as food or medicine by grease and metal filings, eliminates safety hazards, and meets the requirements of oil-free and clean production and use of food-grade filter press equipment.

[0023] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Example 1 refer to Figures 1 to 2 As shown, this embodiment provides an oil-free lubrication drive method for a filter cloth walking filter press, including the following steps: In at least the filter cloth drive mechanism of the filter cloth walking filter press, one or both of the contacting parts of the sprocket 12 and the chain 11 are made of a self-lubricating material; one or both of the contacting parts of the guide wheel 16 and the chain 11 are made of a self-lubricating material; one or both of the driving bevel gear 21 and the driven bevel gear 22 are made of a self-lubricating material at least in their contacting parts. That is, in the two cooperating transmission components, at least one of the contacting parts is made of a self-lubricating material. For example, the contacting part of the sprocket 12 with the chain 11 is made of a self-lubricating material, while the contacting part of the chain 11 with the sprocket 12 can be made of a self-lubricating material or be made of metal. The phrase "at least the contacting parts are made of a self-lubricating material" means that the transmission component may only have self-lubricating material at the contacting points, or the entire surface of the transmission component may be made of a self-lubricating material, or the entire transmission component itself may be made of a self-lubricating material. The above-mentioned parts use self-lubricating materials, eliminating the need for traditional carbon steel or alloy steel materials (such non-self-lubricating metals) to contact or mesh. On the one hand, there is no need to add grease or other lubricants for lubrication, eliminating grease dripping and avoiding grease contamination of food or pharmaceutical raw materials and finished products. On the other hand, it avoids contamination caused by metal shavings and other factors, eliminating safety hazards, and meeting the requirements for oil-free and clean production and use of food-grade filter press equipment.

[0025] In one embodiment of this invention, the self-lubricating material is a food-grade self-lubricating material. This prevents the release of toxic monomers that could contaminate food, pharmaceuticals, or filter cloth 15 that comes into indirect contact with food.

[0026] In one embodiment of this invention, any one or more of the sprocket 12, chain 11, guide wheel 16, drive bevel gear 21, and driven bevel gear 22 may be made of a self-lubricating material or be made by spraying a self-lubricating material onto a metal substrate. That is, the sprocket 12, chain 11, guide wheel 16, drive bevel gear 21, and driven bevel gear 22 may all be made of a self-lubricating material, or all may be made by spraying a self-lubricating material onto a metal substrate. Alternatively, some may be made of a self-lubricating material, and some may be made by spraying a self-lubricating material onto a metal substrate. Preferably, the self-lubricating material is a food-grade self-lubricating material.

[0027] In one embodiment of this invention, the rollers of chain 11 are made of self-lubricating material, and the chain plates of chain 11 are made of stainless steel or self-lubricating material, which can be flexibly selected according to the actual application. Preferably, the self-lubricating material is a food-grade self-lubricating material. This further improves the self-lubricating effect of chain 11 and food safety.

[0028] In one embodiment of this invention, the self-lubricating material is a self-lubricating plastic, ceramic, or a metal material with self-lubricating properties. Preferably, self-lubricating plastics are used, such as polyetheretherketone (PEEK) or ultra-high molecular weight polyethylene (UHMW-PE). Other high-strength, food-grade self-lubricating materials can also be used. Preferably, when used in food or pharmaceuticals, the PEEK or UHMW-PE must meet FDA / GB 9685 food-grade standards to ensure no toxic monomers are released when in contact with the filter cloth 15 or the rinsing water.

[0029] In one embodiment of this invention, the self-lubricating material is doped with polytetrafluoroethylene (PTFE) powder and a carbon fiber reinforcing phase to improve its mechanical and tribological properties. The PTFE micropowder migrates directionally towards the friction interface under meshing shear force, forming a stable polymer transfer film and improving the oil-free self-lubricating performance of the self-lubricating material. The carbon fiber reinforcing phase enhances the strength and toughness of the self-lubricating material, reducing damage to transmission components, especially the breakage of the drive bevel gear 21 and driven bevel gear 22. In actual operation, the polyetheretherketone (PEEK) polymer-doped PTFE powder used in the drive bevel gear 21 and driven bevel gear 22 continuously migrates directionally towards the friction interface under meshing shear force, forming a stable self-lubricating transfer film. This achieves smooth and efficient power transmission without the need for additional lubricating grease, ensuring the precise execution of the filter cloth 15's reciprocating unloading action.

[0030] In one embodiment of this invention, the polygonal rod 23 in the filter cloth driving mechanism is made of food-grade metal material, suitable for food or pharmaceutical processing. Since the driving bevel teeth 21 are mounted on the polygonal rod 23, dynamic friction exists between the driving bevel teeth 21 and the polygonal rod 23; therefore, traditional carbon steel or alloy steel materials must be avoided. The reason for choosing food-grade metal material for the polygonal rod 23, rather than a self-lubricating material, is that the polygonal rod 23 is quite long, some even reaching 10 meters in length. Using a self-lubricating material requires an extrusion process, which is difficult to achieve with current processes, and the strength requirements are also insufficient. Of course, if the polygonal rod 23 is made of food-grade metal material, a self-lubricating material can be sprayed onto its surface.

[0031] The driving bevel gear 21 is mounted on the polygonal bar 23 and can slide back and forth along it. When the polygonal bar 23 rotates, the driving bevel gear 21 rotates simultaneously, driving the driven bevel gear 22 to rotate, and correspondingly driving the transmission part to achieve the up-and-down reciprocating movement of the filter cloth 15. The sprocket 12, chain 11, and guide wheel 16 are part of the transmission part. The driving bevel gear 21, driven bevel gear 22, and polygonal bar 23 constitute the gear drive mechanism in the drive part, which also includes a motor that drives the polygonal bar 23. Because the driving bevel gear 21 and driven bevel gear 22 are made of food-grade self-lubricating material or coated with a metal substrate using food-grade self-lubricating material, lubricating grease can be eliminated; simultaneously, the sliding friction between the driving bevel gear 21 and the polygonal bar 23 does not produce metal filings, further eliminating the need for lubricating grease. The entire transmission process completely eliminates the need for traditional grease (butter). Relying on the self-lubricating properties of the food-grade self-lubricating material itself, it achieves smooth transmission without oil, thus eliminating the potential risk of grease dripping and contaminating food or medicine. At the same time, the food-grade material also avoids the risk of toxic monomers leaching out and contaminating food or medicine.

[0032] In one embodiment of this example, the food-grade metal material is food-grade SUS304 stainless steel. Compared to other food-grade materials, SUS304 stainless steel is less expensive and meets food safety requirements.

[0033] In one embodiment of this invention, the hanging rod 14 for hanging the filter cloth 15 in the filter cloth walking filter press is fixed by hooks 13, which avoids the risk of the nut falling off and the risk of iron filings falling off during the tightening and loosening of the metal screw and nut, thereby preventing contamination of food, medicine, etc. The hooks 13 can be metal hooks 13 or non-metallic hooks 13.

[0034] In one embodiment of this invention, the polygonal bar 23 is made of food-grade SUS304 stainless steel, and the sprocket 12, chain 11, guide wheel 16, drive bevel gear 21, and driven bevel gear 22 use polyetheretherketone (PEEK) polymer-doped polytetrafluoroethylene powder (PTFE powder) as the self-lubricating material. This design fundamentally eliminates the risk of filter cake and filtrate contamination caused by grease evaporation or dripping, fully complying with food production GMP specifications and hygiene and safety standards. Furthermore, when the chain 11, sprocket 12, drive bevel gear 21, and driven bevel gear 22 are in a humid environment containing acidic or alkaline cleaning agents, the preferred PEEK polymer matrix exhibits excellent chemical corrosion resistance and extremely low surface energy. This not only effectively resists performance degradation caused by chemical erosion but also makes it difficult for filter residue and scale to adhere to the tooth surface, allowing direct resistance to high-pressure water jet washing, significantly reducing the risk of cross-contamination and simplifying daily cleaning and maintenance procedures.

[0035] Example 2 refer to Figures 1 to 2 As shown, this embodiment provides a filter cloth driving mechanism for a filter cloth walking filter press, which can be prepared by the oil-free lubrication driving method in Embodiment 2. The filter cloth driving mechanism includes at least a sprocket 12, a chain 11, a guide wheel 16, a driving bevel gear 21, and a driven bevel gear 22. One or both of the contacting parts (meshing parts) of the sprocket 12 and the chain 11 are made of a self-lubricating material; one or both of the contacting parts of the guide wheel 16 and the chain 11 are made of a self-lubricating material; and one or both of the contacting parts (meshing parts) of the driving bevel gear 21 and the driven bevel gear 22 are made of a self-lubricating material.

[0036] In one embodiment of this invention, a multi-faceted rod 23 is also included, which is made of food-grade metal material.

[0037] In one embodiment of this invention, a hanging rod 14 for hanging the filter cloth 15 is also included, and the hanging rod 14 is fixed by hooks 13. The hooks 13 can be metal hooks 13 or non-metal hooks 13.

[0038] In one embodiment of this example, the food-grade metal material is food-grade SUS304 stainless steel. Compared to other food-grade materials, SUS304 stainless steel is less expensive.

[0039] In one embodiment of this invention, any one or more of the sprocket 12, chain 11, guide wheel 16, drive bevel gear 21, and driven bevel gear 22 are made of a self-lubricating material, or are made by spraying a self-lubricating material onto a metal substrate. Preferably, the self-lubricating material is a food-grade self-lubricating material.

[0040] In one embodiment of this example, the self-lubricating material is doped with polytetrafluoroethylene powder (PTFE powder) and carbon fiber reinforcing phase.

[0041] In one embodiment of this invention, the sprocket 12 is mounted on a drive shaft, and the drive shaft and guide wheel 16 are rotatably connected to the frame of the filter cloth traveling filter press. The chain 11 meshes with the sprocket 12 and contacts the guide wheel 16. A drive bevel gear 21 is mounted on a polygonal bar 23, which is rotatably connected to the frame of the filter cloth traveling filter press. A driven bevel gear 22 is mounted on the drive shaft of the sprocket 12. The drive bevel gear 21 and the driven bevel gear 22 mesh. A hook 13 is mounted on the sprocket 12. A hanging rod 14 is mounted on the hook 13. The filter cloth 15 is draped over the hanging rod 14.

[0042] The motor drives the polygonal bar 23 to rotate in both directions. The polygonal bar 23 drives the driving bevel gear 21 to rotate in both directions, which in turn drives the driven bevel gear 22 to rotate in both directions, thereby driving the transmission shaft to rotate in both directions. This causes the sprocket 12 to rotate in both directions. Under the meshing action of the chain 11 and the sprocket 12, the chain 11 drives the hook 13 to move up and down reciprocally, which in turn drives the hanging rod 14 to move up and down reciprocally, ultimately realizing the up and down reciprocating motion of the filter cloth 15.

[0043] This invention proposes an oil-free lubrication drive method and filter cloth drive mechanism for a filter cloth walking filter press, aiming to solve the technical problem of short service life of traditional metal gears and sprockets due to grease lubrication contaminating materials and corrosive environments in food processing and solid-liquid separation conditions. This technical solution innovates from three dimensions: material modification, interfacial mechanical structure, and self-lubricating mechanism.

[0044] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. An oil-free lubrication drive method for a filter cloth walking filter press, characterized in that, Includes the following steps: At least in the filter cloth drive mechanism of the filter cloth walking filter press, One or both of the sprocket (12) and the chain (11) are made of a self-lubricating material at least in the part where they come into contact with each other; One or both of the guide wheel (16) and the chain (11) are made of a self-lubricating material at least in the part where they come into contact with each other; One or both of the driving bevel gear (21) and the driven bevel gear (22) are made of a self-lubricating material at least in the part where they come into contact with each other.

2. The oil-free lubrication drive method according to claim 1, characterized in that, The self-lubricating material is a food-grade self-lubricating material.

3. The oil-free lubrication drive method according to claim 1 or 2, characterized in that, Any one or more of the sprocket (12), the chain (11), the guide wheel (16), the drive bevel gear (21), and the driven bevel gear (22) are made of self-lubricating material or are made of metal substrate coated with self-lubricating material.

4. The oil-free lubrication drive method according to claim 3, characterized in that, The rollers of the chain (11) are made of self-lubricating material, and the chain plates of the chain (11) are made of stainless steel or self-lubricating material.

5. The oil-free lubrication drive method according to claim 2, characterized in that, The multi-faceted rod (23) in the filter cloth drive mechanism is made of food-grade metal material.

6. The oil-free lubrication drive method according to claim 1, characterized in that, The hanging rod (14) for hanging the filter cloth (15) in the filter cloth walking filter press is fixed by hooks (13).

7. A filter cloth driving mechanism for a filter cloth walking filter press, comprising at least a sprocket (12), a chain (11), a guide wheel (16), a driving bevel gear (21), and a driven bevel gear (22), characterized in that, One or both of the sprocket (12) and the chain (11) are made of a self-lubricating material at least at the points where they contact each other; one or both of the guide wheel (16) and the chain (11) are made of a self-lubricating material at least at the points where they contact each other; one or both of the drive bevel gear (21) and the driven bevel gear (22) are made of a self-lubricating material at least at the points where they contact each other.

8. The filter cloth driving mechanism of the filter cloth walking filter press according to claim 7 further includes a multi-faceted bar (23), characterized in that, The multi-faceted rod (23) is made of food-grade metal material.

9. The filter cloth driving mechanism of the filter cloth walking filter press according to claim 7 further includes a multi-faceted bar (23), characterized in that, Any one or more of the sprocket (12), the chain (11), the guide wheel (16), the drive bevel gear (21), and the driven bevel gear (22) are made of self-lubricating material or are made of metal substrate coated with self-lubricating material.

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