A sealing ring glue melt high pressure filtering device

Abstract

The application provides a sealing ring glue melt high-pressure filtering device, which comprises a machine table, a conveying assembly arranged on the machine table, the conveying assembly comprising a conveying pipe for conveying glue melt, and a filtering assembly comprising a filter plate inserted on the conveying pipe, the filter plate being provided with at least two groups of filter screen plates for filtering impurities. Through cooperation of the first driving assembly and the two groups of filter screen plates, parallel operation of work and cleaning is realized, the efficiency defect that the traditional equipment must be stopped for replacing the filter screen is avoided, a special bushing assembly is introduced, the pain point that the transverse sliding type filter plate is difficult to guarantee high-pressure sealing after switching is solved, and through active extrusion sealing, higher conveying pressure can be borne without leakage. The whole filtering, switching, sealing and cleaning process forms a closed loop, and the automation level of the sealing ring glue pretreatment is greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of sealing ring technology, and more specifically, it relates to a high-pressure filtration device for sealing ring rubber melt. Background Technology

[0002] In the manufacturing process of sealing rings, the purity of the rubber melt directly determines the sealing performance and mechanical strength of the finished product. Because the rubber melt typically has extremely high viscosity, and a high-pressure environment needs to be maintained during production and transportation to ensure that the rubber can uniformly fill the mold.

[0003] Existing filtration devices mostly use fixed filter screens, which makes it easy for impurities to accumulate and clog the screens when filtering high-viscosity adhesives. Clogged screens cause a rapid increase in pressure inside the delivery pipe; if not addressed promptly, this can not only affect the stability of the adhesive flow rate but may even lead to pipe rupture. To clear the blockage, operators often need to shut down the machine, release pressure, and disassemble the filter components, resulting in frequent production line interruptions, significant heat loss, and complex restart and process parameter adjustments.

[0004] More seriously, during frequent shutdowns and disassembly, the residual adhesive on the filter screen solidifies rapidly due to the drop in temperature, making it difficult to remove completely with ordinary cleaning methods, thus significantly shortening the filter screen's lifespan. Simultaneously, due to the lack of an effective dynamic high-pressure sealing mechanism, high-pressure leakage, or overflow, easily occurs at the filter interface after filter replacement or switching. This not only wastes raw materials but also compromises the cleanliness of the production environment and increases subsequent maintenance costs. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention provides a high-pressure filtration device for sealing ring rubber melt, the purpose and effectiveness of which are achieved through the following specific technical means:

[0006] A high-pressure filtration device for sealing ring rubber melt, comprising:

[0007] Machine tool;

[0008] A conveying assembly, disposed on the machine base, the conveying assembly including a conveying pipe for conveying the molten rubber compound;

[0009] A filtration assembly, comprising a filter plate inserted into the conveying pipe, wherein the filter plate is provided with at least two sets of filter screens for filtering impurities;

[0010] The first driving component is disposed on both sides of the filter plate and fixedly connected to the filter plate. The first driving component is used to drive the filter plate to move laterally reciprocally, so as to realize the switching of the two sets of filter screens between the working station and the cleaning station.

[0011] The cleaning assembly includes a filter screen cleaning assembly disposed between the first drive assembly and the conveying pipe, and a second drive assembly for driving the filter screen cleaning assembly to move vertically up and down. The filter screen cleaning assembly is used to rinse the filter screen disc for molten residue when the filter screen disc is in the cleaning station.

[0012] A bushing assembly is disposed on the conveying pipe and located on the side of the filter plate. It is used to seal the gap between the filter plate and the conveying pipe after the filter screen is switched, so as to maintain the high pressure environment inside the conveying pipe. The bushing assembly includes two fixing rings welded and fixed to the outer annular surface of the delivery pipe, and at least three third hydraulic cylinders are evenly arranged on the fixing rings along the circumferential direction. The movable ends of the plurality of the third hydraulic cylinders are fixedly connected by a movable ring, and a high-temperature resistant sealing ring is provided on the side of the movable ring facing the filter plate; When switching the filter screen, the movable ring disengages from the filter plate under the drive of the third hydraulic cylinder. After the switching is completed, the movable ring moves toward the filter plate and causes the high-temperature sealing ring to be squeezed and deformed to achieve a seal.

[0013] The control unit is electrically connected to the first drive assembly, the second drive assembly, the bushing assembly, and the filter cleaning assembly, respectively, and is used to coordinate the operation of each assembly.

[0014] Preferably, the filter plate includes a strip-shaped metal plate with two through holes, and the filter screen is detachably installed inside the through holes;

[0015] A limiting protrusion is provided on one side edge of the through hole along the conveying direction of the conveying pipe, and an external threaded ring extends from the inner side of the limiting protrusion.

[0016] The filter screen includes a mesh sheet and two disc rings for clamping the mesh sheet. The two disc rings are welded and fixed. One of the disc rings has an internal thread on its inner side. The filter screen is threadedly connected to the external threaded ring through the internal thread, so that the disc ring is tightly fitted with the limiting protrusion ring.

[0017] Preferably, the other side of the disc ring is provided with two protrusions, which are used to cooperate with external clamps to drive the filter disc to rotate and disassemble relative to the through hole.

[0018] Preferably, the first drive assembly includes a first hydraulic cylinder fixedly mounted on the machine base. The first hydraulic cylinder is arranged laterally, and the movable end of the first hydraulic cylinder is fixedly connected to one side of the filter plate by bolts.

[0019] Preferably, the filter cleaning assembly includes a disc body, and an open groove is provided on the top of the disc body for accommodating the edge of the filter plate. The width of the edge into which the filter plate is inserted in the open groove is 4-6 mm greater than the thickness of the filter plate, and the height of the open groove is 5-10 mm greater than the height of the filter disc.

[0020] A high-temperature and high-pressure nozzle is provided on one side of the inside of the disc along the conveying direction of the conveying pipe, and an arc-shaped side groove is provided on the other side of the inside of the disc. An outlet is provided below the arc-shaped side groove, and the outlet is connected to an external output pipe.

[0021] Preferably, the nozzles of the high-temperature and high-pressure nozzle are arranged in a first ring, a second ring, and a third ring from the outside to the inside, so as to impact and clean different radial areas of the filter screen through the nozzles at different ring positions.

[0022] Preferably, the second drive assembly includes a second hydraulic cylinder fixedly mounted on the machine base. The second hydraulic cylinder is arranged vertically, and the movable end of the second hydraulic cylinder is fixedly connected to the bottom surface of the disc body by bolts.

[0023] Preferably, the movable ring is connected to the movable end of the third hydraulic cylinder by bolts.

[0024] Preferably, the first hydraulic cylinder, the second hydraulic cylinder, and the third hydraulic cylinder are all connected to the same hydraulic pump, and each hydraulic cylinder is equipped with a solenoid valve controlled by the control unit on its pipeline. The first hydraulic cylinder is connected to the first solenoid valve, the second hydraulic cylinder is connected to the second solenoid valve, and the third hydraulic cylinder is connected to the third solenoid valve.

[0025] Beneficial effects

[0026] This invention achieves parallel operation of working and cleaning through the cooperation of the first drive component and two sets of filter discs, avoiding the inefficiency of traditional equipment that requires shutdown for filter replacement. It introduces a specialized bushing component, solving the problem of difficulty in maintaining high-pressure sealing after switching in transverse sliding filter plates. Through active compression sealing, it can withstand higher levels of conveying pressure without leakage. The integrated filter cleaning component enables online recycling of the filter, significantly reducing the cost of filter media consumption while avoiding the risk of burns and inefficiency associated with manual cleaning. The unified coordination of the control unit creates a closed loop for the entire filtration, switching, sealing, and cleaning process, greatly improving the automation level of the sealing ring material pretreatment.

[0027] The first drive component drives the filter plate, which is equipped with two sets of filter discs, to move laterally, enabling rapid switching of the filter between the working station and the cleaning station. Addressing the problem in existing technologies where filter clogging necessitates machine shutdown, pressure release, and disassembly for replacement, this invention enables online filter replacement without shutting down the machine, ensuring continuous melt delivery of the adhesive and significantly improving the overall production efficiency of the production line.

[0028] By incorporating a bushing assembly, a third hydraulic cylinder drives a movable ring and a high-temperature resistant sealing ring for active extrusion sealing. Addressing the issue of high-viscosity melts easily leaking through the sliding gaps in the filter plates during high-pressure conveying, this structure can quickly establish an elastic compensation sealing interface after filter screen switching, effectively locking in the high pressure inside the conveying pipe. This not only ensures the stability of the extrusion pressure but also avoids raw material waste and environmental pollution.

[0029] By using the lifting and lowering action of the filter cleaning component in conjunction with the second drive component, automatic enveloping rinsing of the filter screen at the cleaning station is achieved. Addressing the problem that molten residue easily solidifies and forms a crust on the filter screen, leading to its failure, this invention uses high-temperature, high-pressure fluid to clean the filter screen online. This rapidly removes accumulated adhesive, restoring the filter screen's filtration performance and significantly reducing the frequency of consumable replacements and production costs.

[0030] By employing a high-temperature, high-pressure nozzle with a first, second, and third ring of holes arranged from the outside in, differentiated impacts are achieved on different radial areas of the filter screen. Addressing the characteristics of the filter screen edges where the threaded structure easily accumulates dead-angle materials and the high flow velocity and impurity buildup in the central area, the multi-ring distribution precisely distributes the cleaning pressure, ensuring thorough purification of the filter screen from the edge to the center and improving the recovery rate of residual melt.

[0031] By incorporating a limiting protruding ring and an external threaded ring within the through-holes of the filter plate, and in conjunction with the internal thread of the filter screen disc ring, a high-strength threaded locking mechanism is formed. This structure provides excellent mechanical support to address the issue of axial displacement or deformation of the filter screen under ultra-high pressure conditions. Simultaneously, the protrusions on the disc ring, used in conjunction with external tools for tightening, effectively overcome the strong adhesion force generated by the high-temperature adhesive, making subsequent maintenance and quick replacement of the filter screen disc much simpler.

[0032] The first, second, and third hydraulic cylinders are logically coordinated and controlled by a control unit, and they share the same hydraulic pump power source. Addressing the challenge of complex multi-condition coordination, this invention uses solenoid valves to precisely adjust the timing of each actuator. This ensures seamless operation during screen replacement, sealing, and cleaning processes while reducing the system's installed power and energy consumption, demonstrating a high level of industrial automation and energy-saving value. Attached Figure Description

[0033] Figure 1This is a three-dimensional structural schematic diagram of a high-pressure filtration device for sealing ring rubber melt according to the present invention.

[0034] Figure 2 This is a side view of the high-pressure filtration device for sealing ring rubber melt according to the present invention.

[0035] Figure 3 for Figure 2 A schematic diagram of the cross-sectional structure.

[0036] Figure 4 for Figure 3 A magnified side view of a portion of the middle section.

[0037] Figure 5 for Figure 4 Enlarged structural diagram at point A in the middle.

[0038] Figure 6 for Figure 5 Side view.

[0039] Figure 7 for Figure 1 An enlarged structural schematic diagram of a bushing assembly.

[0040] Figure 8 for Figure 4 An enlarged structural diagram of a type of filter plate.

[0041] Figure 9 for Figure 8 Enlarged cross-sectional view of the structure at point B.

[0042] Figure 10 This is a module connection diagram of a high-pressure filtration device for sealing ring rubber melt according to the present invention.

[0043] In the diagram: 1. Machine base; 2. Conveying pipe; 3. Filter plate; 31. Strip metal plate; 32. Through hole; 33. Limiting protrusion ring; 34. External threaded ring; 4. Filter screen disc; 41. Screen sheet; 42. Disc ring; 43. Protrusion; 5. First drive assembly; 51. First hydraulic cylinder; 6. Filter screen cleaning assembly; 61. Disc body; 62. Open groove; 63. High temperature and high pressure nozzle; 631. First annular hole; 632. Second annular hole; 633. Third annular hole; 64. Arc-shaped side groove; 65. Outlet; 7. Second drive assembly; 71. Second hydraulic cylinder; 8. Bushing assembly; 81. Fixed ring; 82. Third hydraulic cylinder; 83. Moving ring; 84. High temperature resistant sealing ring; 9. Control unit; 10. Hydraulic pump. Detailed Implementation

[0044] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0045] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0047] Example

[0048] As attached Figure 1 To be continued Figure 10 As shown:

[0049] A high-pressure filtration device for sealing ring rubber melt includes: a machine base 1; a conveying assembly, which is disposed on the machine base 1 and includes a conveying pipe 2 for conveying the rubber melt; and a filtration assembly, which includes a filter plate 3 inserted on the conveying pipe 2 and at least two sets of filter screens 4 for filtering impurities.

[0050] The first driving component 5 is disposed on both sides of the filter plate 3 and fixedly connected to the filter plate 3. The first driving component 5 is used to drive the filter plate 3 to move laterally back and forth so as to realize the switching of the two sets of filter screens 4 between the working station and the cleaning station.

[0051] The cleaning assembly includes a filter screen cleaning assembly 6 disposed between the first drive assembly 5 and the conveying pipe 2, and a second drive assembly 7 for driving the filter screen cleaning assembly 6 to move vertically up and down. The filter screen cleaning assembly 6 is used to rinse the filter screen disk 4 for molten residue when the filter screen disk 4 is in the cleaning station.

[0052] The bushing assembly 8 is disposed on the conveying pipe 2 and located on the side of the filter plate 3. It is used to seal the gap between the filter plate 3 and the conveying pipe 2 after the filter screen disc 4 is switched, so as to maintain the high pressure environment inside the conveying pipe 2. The control unit 9 is electrically connected to the first drive assembly 5, the second drive assembly 7, the bushing assembly 8 and the filter screen cleaning assembly 6, respectively, and is used to coordinate the operation of each assembly.

[0053] To achieve precise programmed control, proximity sensors are installed at the end of the strokes of both the first hydraulic cylinder 51 and the second hydraulic cylinder 71. The control unit 9 can only activate the first hydraulic cylinder 51 after receiving a signal that the bushing assembly 8 has completely disengaged; and can only drive the second hydraulic cylinder 71 to lift and clean after receiving a signal that the filter plate 3 has moved into place. The closed-loop control logic based on sensor feedback avoids mechanical interference between the components.

[0054] First, during the normal filtration stage, the molten rubber enters the filter assembly through the delivery pipe 2. One set of filter discs 4 is in its working position, positioned along the path of the delivery pipe 2 to intercept impurities. When the control unit 9 detects through the pressure sensor that the internal pressure of the delivery pipe 2 exceeds a preset threshold, it determines that the set of filter discs 4 is clogged. At this time, the control unit 9 issues a command to first move the movable ring 83 of the bushing assembly 8 away from the filter plate 3, releasing the compression seal on the filter plate 3.

[0055] Subsequently, the first drive assembly 5 drives the filter plate 3 to move laterally, causing the clogged filter screen 4, which was originally in the working position, to move to the side cleaning position, while another set of clean filter screens 4 simultaneously enters the working position of the conveying pipe 2. After the switching is completed, the bushing assembly 8 immediately resets, and its movable ring 83, through the high-temperature resistant sealing ring 84, once again tightly presses the connection interface between the filter plate 3 and the conveying pipe 2, thereby quickly restoring and maintaining the high-pressure state inside the conveying pipe 2, ensuring that the production process does not stop due to screen changing, and realizing automatic screen changing without stopping the machine.

[0056] For the filter screen 4 located at the cleaning station, the second drive assembly 7 drives the filter screen cleaning assembly 6 to rise, so that its disc body 61 wraps around the filter plate 3. Subsequently, the high-temperature and high-pressure nozzle 63 inside the filter screen cleaning assembly 6 sprays high-temperature fluid to impact the filter screen 4, washing away the attached residual adhesive, and the impurities are discharged through the outlet 65.

[0057] Furthermore, the machine 1 includes a water tank, a high-pressure pump, and an online heater. When the cleaning process is started, the control unit 9 drives the high-pressure pump to draw water into the online heater and heat it to 80-120°C, and then delivers it to the high-temperature, high-pressure nozzle 63 through a hose. By controlling the jet pressure of the high-temperature fluid, it can instantly soften and peel off the adhered adhesive residue when it impacts the mesh 41.

[0058] Compared with existing technologies, the significant advantages of this solution are:

[0059] By cooperating with the first drive component 5 and the two sets of filter screens 4, parallel operation of working and cleaning is achieved, avoiding the inefficiency of traditional equipment that must be stopped to replace the filter screen, and improving production efficiency by more than 30%.

[0060] A specialized bushing assembly 8 was introduced, which solved the problem of difficulty in ensuring high-pressure sealing after switching of transverse sliding filter plates. Through active compression sealing, it can withstand higher levels of conveying pressure without leakage.

[0061] The integrated filter cleaning assembly 6 enables online recycling of the filter, significantly reducing the cost of filter media consumption while avoiding the risk of burns and inefficiency associated with manual cleaning. The unified coordination of the control unit 9 creates a closed loop for the entire filtration, switching, sealing, and cleaning process, greatly improving the automation level of the sealing ring material pretreatment.

[0062] To address the issues of component wear caused by frequent switching of filter plate 3 under high-pressure conditions and the difficulty in securing and quickly replacing the mesh 41, filter plate 3 includes a strip metal plate 31 with two through holes 32. Filter screen 4 is detachably installed inside the through holes 32. A limiting protrusion ring 33 is provided on one edge of the through hole 32 along the conveying direction of the conveying pipe 2. An external threaded ring 34 extends from the inner side of the limiting protrusion ring 33. Filter screen 4 includes a mesh 41 and two disc rings 42 for clamping the mesh 41. The two disc rings 42 are welded and fixed. One disc ring 42 has an internal thread on its inner side. Filter screen 4 is threadedly connected to the external threaded ring 34 through the internal thread, so that the disc ring 42 and the limiting protrusion ring 33 fit tightly together.

[0063] In actual operation, the strip metal plate 31 serves as the main load-bearing structure, with through holes 32 formed through machining. The limiting protrusion ring 33 provides an axial positioning reference for the filter screen disc 4. When the filter screen disc 4 needs to be installed, it is inserted into the through hole 32 and rotated, utilizing the internal thread on the disc ring 42 to engage with the external thread ring 34. This threaded locking mechanism can provide extremely strong reverse support force when facing molten high pressure of 10-30MPa, preventing the screen 41 from shifting due to uneven force. The two disc rings 42 are laser-welded to press the edges of the screen 41 together, ensuring the overall rigidity of the filter screen.

[0064] Because the filter screen 4 is in a high-temperature molten environment for a long time, the adhesive will generate huge adhesion after the material cools and solidifies, making manual disassembly extremely difficult. Two protrusions 43 are provided on the other side of the disc ring 42. The protrusions 43 are used to cooperate with the external clamp to drive the filter screen 4 to rotate relative to the through hole 32 for disassembly.

[0065] The protrusions 43 are symmetrically distributed on the end face of the disc ring 42. When the filter screen needs to be replaced, the claw of an external special wrench or automated robotic arm can be engaged between the two protrusions 43, and the friction between the threads and the stickiness of the adhesive can be easily overcome by lever torque. This structure avoids deformation caused by direct impact on the filter plate 3 and protects the precision-fitted sealing surface.

[0066] To ensure the stroke accuracy and power stability of the filter plate 3 when switching between the two workstations, and to prevent the center of the filter screen 4 from deviating from the axis of the conveying pipe 2 due to inertial impact, the first drive assembly 5 includes a first hydraulic cylinder 51 fixedly installed on the machine base 1. The first hydraulic cylinder 51 is arranged laterally, and the movable end of the first hydraulic cylinder 51 is fixedly connected to the side of one side of the filter plate 3 by bolts.

[0067] To ensure the levelness and stability of the filter plate 3 during reciprocating movement, the machine base 1 is equipped with two parallel linear guide rails, and the bottom of the filter plate 3 is equipped with a slider that matches the linear guide rails. Meanwhile, the conveying pipe 2 is fixedly connected to the machine base 1 near the lower part of the bushing assembly 8 to counteract the lateral force exerted by the first hydraulic cylinder 51, ensuring that the filter screen 4 can be accurately aligned with the central axis of the conveying pipe 2.

[0068] The cylinder body of the first hydraulic cylinder 51 is vertically fixed to the side support frame of the machine base 1 by high-strength bolts, and its piston rod extension end is locked to the side edge of the strip metal plate 31 through a flange connector. When hydraulic oil enters the rodless chamber of the first hydraulic cylinder 51, it pushes the filter plate 3 to slide along the transverse guide rail. The hydraulic drive method has the characteristics of large thrust and adjustable speed, which can ensure that the station switching is completed within 2-5 seconds, effectively shortening the interruption time of the rubber material flow channel.

[0069] Because the melt has extremely strong permeability under high temperature and high pressure, if the residual adhesive on the surface of the filter plate 3 is not cleaned in time, it will cause the mechanism to jam or cause secondary pollution. The filter screen cleaning component 6 includes a disc body 61. An open groove 62 for accommodating the edge of the filter plate 3 is opened on the top of the disc body 61. The width of the edge into which the filter plate 3 is inserted in the open groove 62 is 4-6 mm greater than the thickness of the filter plate 3, and the height of the open groove 62 is 5-10 mm greater than the height of the filter screen disc 4. A high temperature and high pressure nozzle 63 is provided on one side of the disc body 61 along the conveying direction of the conveying pipe 2, and an arc-shaped side groove 64 is provided on the other side of the disc body 61. An outlet 65 is provided below the arc-shaped side groove 64, and the outlet 65 is connected to an external output pipe.

[0070] When this component is in operation, the disc 61 moves vertically, causing the open groove 62 to laterally enclose the area of ​​the filter screen 4 to be cleaned. The reserved 4-6mm width gap is to prevent physical collision between the disc 61 and the filter plate 3 during movement, and the semi-enclosed space formed can effectively suppress spray splash. The softening medium or high-pressure water jet sprayed by the high-temperature and high-pressure nozzle 63 penetrates the mesh 41, and the peeled residue is guided by the arc-shaped side groove 64 to generate a swirling flow, and finally converges to the outlet 65 at the bottom for discharge by gravity.

[0071] Considering that the thickness of impurities accumulated at different radial positions on the surface of the filter screen 4 is uneven, it is difficult for a single nozzle to achieve full coverage cleaning. The nozzles of the high-temperature and high-pressure nozzle 63 are arranged from the outside to the inside as the first ring hole 631, the second ring hole 632 and the third ring hole 633, and the nozzles at different ring positions are used to impact and clean different radial areas of the filter screen 4.

[0072] This radially distributed nozzle structure ensures that the cleaning medium covers the entire effective filtration area of ​​the filter disc 4. The first annular hole 631 primarily cleans the edge threaded area to prevent the adhesive from hardening and affecting disassembly; the second annular hole 632 and the third annular hole 633 perform deep rinsing on the central high-velocity area. The diameter of each annular hole can be adjusted according to hydrodynamic requirements, for example, making the jet pressure in the central area higher than that in the edge area, to achieve differentiated and precise descaling.

[0073] In order to provide sufficient clearance for the lateral switching of filter plate 3 and to ensure that the distance between the nozzle and the filter screen remains constant during cleaning, the second drive assembly 7 includes a second hydraulic cylinder 71 fixedly installed on the machine base 1. The second hydraulic cylinder 71 is arranged vertically, and the movable end of the second hydraulic cylinder 71 is fixedly connected to the bottom surface of the disc body 61 by bolts.

[0074] The bottom support of the second hydraulic cylinder 71 is installed on the foundation platform of the machine base 1, and its vertically upward piston rod lifts the disc 61 through bolted connections. In the non-cleaning state, the second hydraulic cylinder 71 is in a retracted state, so that the disc 61 is lower than the running trajectory of the filter plate 3, ensuring unobstructed lateral switching. During cleaning, the hydraulic cylinder lifts the disc 61 to a predetermined coordinate, with the error controlled within 0.5mm.

[0075] Because there is a necessary assembly gap between the filter plate 3 and the conveying pipe 2, leakage is very likely to occur during high-pressure conveying. The bushing assembly 8 includes two fixed rings 81 welded and fixed to the outer ring surface of the conveying pipe 2. At least three third hydraulic cylinders 82 are evenly arranged on the fixed rings 81 along the circumferential direction. The movable ends of the multiple third hydraulic cylinders 82 are fixedly connected by a movable ring 83. A high-temperature resistant sealing ring 84 is provided on the side of the movable ring 83 facing the filter plate 3. When switching the filter screen 4, the movable ring 83 is driven by the third hydraulic cylinder 82 to disengage from the filter plate 3. After the switching is completed, the movable ring 83 moves toward the filter plate 3 and squeezes and deforms the high-temperature resistant sealing ring 84 to achieve sealing.

[0076] Preferably, the bushing assembly 8 is symmetrically arranged on both sides of the filter plate 3, that is, both the inlet and outlet ends of the conveying pipe 2 are provided with movable rings 83 driven by the third hydraulic cylinder 82. By synchronously controlling the third hydraulic cylinders 82 on both sides through the control unit 9, the two movable rings 83 simultaneously squeeze the filter plate 3 towards the center, thereby forming a balanced sealing pressure on both sides of the filter plate 3. This symmetrical extrusion structure not only counteracts the lateral shear force brought about by the unidirectional seal and protects the filter plate 3 from elastic deformation, but also ensures that there is no leakage of the melt under ultra-high pressure of 30MPa.

[0077] The bushing assembly 8 employs multiple circumferentially distributed third hydraulic cylinders 82. This structure ensures the axial parallelism of the movable ring 83 during its advancement through the combined force, preventing seal failure caused by eccentric pressure. The high-temperature resistant sealing ring 84 is made of perfluoroether or fluororubber. Under the continuous thrust of the third hydraulic cylinders 82, the sealing ring undergoes 15%-25% elastic deformation, filling the gap between the filter plate 3 and the end face of the delivery pipe 2. This active compensation sealing structure is more suitable for operating conditions with frequent pressure fluctuations compared to traditional seals.

[0078] To ensure rigid transmission of sealing pressure and facilitate later maintenance and replacement, the movable ring 83 is connected to the movable end of the third hydraulic cylinder 82 by bolts.

[0079] The movable ring 83 is locked to the piston ends of multiple hydraulic cylinders by high-strength bolts, forming a single movable clamping frame. When a hydraulic cylinder experiences sealing failure or unstable pressure, it can be repaired by disassembling it individually with bolts, without having to disassemble the entire delivery pipe 2.

[0080] To achieve intensive energy utilization and simplify control logic, the first hydraulic cylinder 51, the second hydraulic cylinder 71 and the third hydraulic cylinder 82 are all connected to the same hydraulic pump 10, and each hydraulic cylinder is equipped with a solenoid valve controlled by the control unit 9 on its pipeline.

[0081] The first hydraulic cylinder 51 is connected to the first solenoid valve 511, the second hydraulic cylinder 71 is connected to the second solenoid valve 512, and the third hydraulic cylinder 82 is connected to the third solenoid valve 513.

[0082] Hydraulic pump 10 serves as the power source, distributing hydraulic oil to each branch via a flow divider / combiner valve block. Control unit 9 controls the on / off state and flow direction of each solenoid valve via electrical signals, thereby achieving sequential coupling of actions: first, the third hydraulic cylinder 82 retracts, then the first hydraulic cylinder 51 pushes the filter plate 3, subsequently, the third hydraulic cylinder 82 extends to press, and finally, the second hydraulic cylinder 71 coordinates with the cleaning logic. Sharing the hydraulic pump 10 reduces the installed power by more than 20% and decreases the space occupied by the machine 1.

[0083] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A sealing ring compound melt high pressure filtration apparatus, characterized by, include: Machine (1); A conveying assembly is disposed on the machine base (1), the conveying assembly including a conveying pipe (2) for conveying the melt of the rubber compound. The filter assembly includes a filter plate (3) inserted into the conveying pipe (2), and the filter plate (3) is provided with at least two sets of filter screens (4) for filtering impurities. The first drive assembly (5) is disposed on both sides of the filter plate (3) and fixedly connected to the filter plate (3). The first drive assembly (5) is used to drive the filter plate (3) to move back and forth in the transverse direction so as to realize the switching of the two sets of filter screens (4) between the working station and the cleaning station. The cleaning assembly includes a filter screen cleaning assembly (6) disposed between the first drive assembly (5) and the conveying pipe (2), and a second drive assembly (7) for driving the filter screen cleaning assembly (6) to move vertically up and down. The filter screen cleaning assembly (6) is used to rinse the filter screen disk (4) for molten residue when the filter screen disk (4) is in the cleaning station. Bushing assembly (8), which is disposed on the conveying pipe (2) and located on the side of the filter plate (3), is used to seal the gap between the filter plate (3) and the conveying pipe (2) after the filter screen (4) is switched, so as to maintain the high pressure environment inside the conveying pipe (2); The bushing assembly (8) includes two fixing rings (81) welded and fixed to the outer annular surface of the delivery pipe (2), and at least three third hydraulic cylinders (82) are evenly arranged on the fixing rings (81) along the circumferential direction. The movable ends of the plurality of the third hydraulic cylinders (82) are fixedly connected by a movable ring (83), and a high-temperature resistant sealing ring (84) is provided on the side of the movable ring (83) facing the filter plate (3). When switching the filter screen (4), the movable ring (83) is driven by the third hydraulic cylinder (82) to disengage from the filter plate (3). After the switching is completed, the movable ring (83) moves toward the filter plate (3) and causes the high-temperature sealing ring (84) to be squeezed and deformed to achieve sealing. The control unit (9) is electrically connected to the first drive assembly (5), the second drive assembly (7), the bushing assembly (8) and the filter cleaning assembly (6) respectively, and is used to coordinate the operation of each assembly; The filter cleaning assembly (6) includes a disc body (61). A high-temperature and high-pressure nozzle (63) is provided on one side of the disc body (61) along the conveying direction of the conveying pipe (2). The nozzles of the high-temperature and high-pressure nozzle (63) are arranged from the outside to the inside as a first ring hole (631), a second ring hole (632) and a third ring hole (633). The nozzles at different ring positions are used to impact and clean different radial areas of the filter disc (4).

2. The high-pressure filtration device for sealing ring rubber melt according to claim 1, characterized in that, The filter plate (3) includes a strip metal plate (31) with two through holes (32) on it, and the filter screen (4) is detachably installed inside the through holes (32). The through hole (32) is provided with a limiting protrusion ring (33) on one side edge along the conveying direction of the conveying pipe (2), and the inner side of the limiting protrusion ring (33) extends with an external threaded ring (34). The filter disc (4) includes a mesh (41) and two disc rings (42) for clamping the mesh (41). The two disc rings (42) are welded and fixed. One of the disc rings (42) has an internal thread on its inner side. The filter disc (4) is connected to the external threaded ring (34) through the internal thread, so that the disc ring (42) is tightly fitted with the limiting protrusion ring (33).

3. The high-pressure filtration device for sealing ring rubber melt according to claim 2, characterized in that, Two protrusions (43) are provided on the other side of the disc ring (42). The protrusions (43) are used to cooperate with the external clamp to drive the filter disc (4) to rotate and disassemble relative to the through hole (32).

4. The high-pressure filtration device for sealing ring rubber melt according to claim 1, characterized in that, The first drive assembly (5) includes a first hydraulic cylinder (51) fixedly installed on the machine base (1). The first hydraulic cylinder (51) is arranged laterally, and the movable end of the first hydraulic cylinder (51) is fixedly connected to the side of the filter plate (3) by bolts.

5. The high-pressure filtration device for sealing ring rubber melt according to claim 4, characterized in that, The filter cleaning assembly (6) includes an open groove (62) on the top of the disc body (61) for accommodating the edge of the filter plate (3). The width of the edge into which the filter plate (3) is inserted in the open groove (62) is 4-6 mm greater than the thickness of the filter plate (3), and the height of the open groove (62) is 5-10 mm greater than the height of the filter disc (4). An arc-shaped side groove (64) is provided on the other side of the interior of the disk body (61), and an outlet (65) is provided below the arc-shaped side groove (64), and the outlet (65) is connected to an external output pipe.

6. The high-pressure filtration device for sealing ring rubber melt according to claim 5, characterized in that, The second drive assembly (7) includes a second hydraulic cylinder (71) fixedly installed on the machine base (1). The second hydraulic cylinder (71) is arranged vertically, and the movable end of the second hydraulic cylinder (71) is fixedly connected to the bottom surface of the disc body (61) by bolts.

7. A high-pressure filtration device for sealing ring rubber melt according to claim 6, characterized in that, The movable ring (83) is connected to the movable end of the third hydraulic cylinder (82) by bolts.

8. The high-pressure filtration device for sealing ring rubber melt according to claim 7, characterized in that, The first hydraulic cylinder (51), the second hydraulic cylinder (71) and the third hydraulic cylinder (82) are all connected to the same hydraulic pump (10), and each hydraulic cylinder is equipped with a solenoid valve controlled by the control unit (9) on its pipeline. The first hydraulic cylinder (51) is connected to the first solenoid valve (511), the second hydraulic cylinder (71) is connected to the second solenoid valve (512), and the third hydraulic cylinder (82) is connected to the third solenoid valve (513).

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