A polishing device for filter housing machining

Abstract

This invention relates to the field of filter processing equipment technology. It provides a grinding device for processing filter housings. The grinding unit includes a slide table slidably mounted on a worktable and capable of sliding close to a positioning unit. A grinding rod is rotatably mounted on the slide table around an axis and extends towards the positioning unit. The grinding rod has an air supply chamber, and its peripheral wall has an air passage for introducing high-pressure gas into the air supply chamber and an air outlet for discharging high-pressure gas. This technical solution, through the interconnected design of the air supply chamber, air passage, and air outlet, enables the grinding rod to perform both grinding and cleaning functions. Compared to the existing method of manually blowing each filter piece individually, this significantly improves cleaning efficiency and eliminates the need for tool changes. The overall structure integrates grinding and cleaning functions into a single device, structurally solving the technical problem of difficult-to-clean debris residue, ensuring the cleanliness of the internal housing, and reducing the risk of filter element clogging during subsequent use.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of filter processing equipment, specifically to a grinding device for processing filter housings. Background Technology

[0002] As a crucial component in the automotive, construction machinery, and other fields, the quality of the filter's outer casing directly impacts its overall performance. During the manufacturing process of the filter casing, inner wall grinding and polishing is a key step. Its purpose is to remove burrs, scratches, and other defects from the inner wall, improving its smoothness and precision to ensure effective filtration and extend the filter's lifespan.

[0003] Currently, existing technologies for polishing the inner wall of filter housings typically involve inserting polishing tools (such as polishing blocks or grinding wheels) into the filter housing and polishing the inner wall through the rotation or reciprocating motion of the tools. To improve processing efficiency and automation, some specialized polishing equipment has emerged, such as using robotic arms to drive the polishing tools or fixing the filter housing onto a rotating device to achieve uniform polishing of the inner wall in conjunction with the polishing mechanism. However, these existing technologies generally suffer from a pressing technical problem after polishing the inner wall: debris (such as metal shavings and abrasive particles) generated during the polishing process remains inside the filter housing.

[0004] Specifically, the debris generated during the polishing process adheres to the inner surface of the housing or accumulates in hard-to-clean areas such as the bottom and corners. If this debris is not effectively removed, it may enter the filter with the fluid medium during subsequent use, causing filter element blockage, affecting the filter's filtration performance, and even adversely impacting the normal operation of the entire system. In existing technologies, the handling of residual debris after polishing often requires secondary manual cleaning, such as using high-pressure air guns or brushes. This not only increases processing and time costs but also makes it difficult to thoroughly remove debris from filter housings with complex structures, uneven inner walls, or deep cavities, resulting in poor cleaning effectiveness. Summary of the Invention

[0005] To overcome the above-mentioned defects, embodiments of the present invention provide a grinding device for processing filter housings, which solves the technical problem in the prior art that after grinding and polishing the inner wall of the filter housing, debris generated during grinding and polishing remains inside the filter housing.

[0006] According to one aspect, at least one embodiment of the present invention provides a grinding apparatus for processing a filter housing, comprising a worktable, a positioning unit disposed on the worktable for fixing the filter housing, and a grinding unit for extending into the filter housing to grind the inner wall of the filter housing; the grinding unit includes:

[0007] A slide table is slidably mounted on the worktable and can slide close to the positioning unit;

[0008] A grinding rod is rotatably mounted on the slide platform around its axis and extends towards the positioning unit. The grinding rod has an air supply chamber inside, and its peripheral wall has an air passage for introducing high-pressure gas into the air supply chamber and an air outlet for discharging the high-pressure gas. The grinding rod can enter the filter housing under the sliding motion of the slide platform and grind the inner wall of the filter housing. The grinding rod can also introduce high-pressure gas into the filter housing through the air outlet to blow out debris from inside the filter housing.

[0009] For example, in a polishing apparatus for processing a filter housing provided in at least one embodiment of the present invention, the polishing rod includes:

[0010] The rod body is rotatably connected to the slide table. The rod body has a first inner cavity that opens toward the positioning unit. The rod body is used to polish the inner wall of the filter housing.

[0011] The telescopic part is slidably connected to the first inner cavity, and the telescopic part has a second inner cavity that communicates with the first inner cavity. The first inner cavity and the second inner cavity together form the air supply cavity, and the air outlet is located at the end of the telescopic part away from the rod body.

[0012] An elastic element is disposed within the first inner cavity. The elastic element is used to elastically push the telescopic part so that the telescopic part extends outward from the rod body.

[0013] For example, in a grinding device for processing a filter housing provided in at least one embodiment of the present invention, the telescopic part has a sliding end slidably connected to the first inner cavity and an extended end extending out of the rod body. The sliding end is provided with a sealing plate for sealing the second inner cavity. An air inlet hole communicating with the second inner cavity is provided on the peripheral wall of the sliding end. A plurality of circumferentially spaced limiting blocks are fixedly connected to the outer periphery of the sliding end. A limiting ring protruding towards the axial side is provided at the opening end of the first inner cavity. The inner peripheral wall of the limiting ring slides in cooperation with the outer peripheral wall of the telescopic part. The limiting ring is used to abut against the limiting block to limit the sliding range of the telescopic part relative to the rod body. The limiting ring can also block the air inlet hole when abutting against the limiting block to prevent high-pressure gas from entering the second inner cavity.

[0014] For example, in a grinding apparatus for processing a filter housing provided in at least one embodiment of the present invention, the limiting block has a receiving groove on the end face near the elastic member for accommodating the end of the elastic member.

[0015] For example, in a grinding device for processing filter housing provided in at least one embodiment of the present invention, the outer peripheral wall of the telescopic part has a limiting strip extending along the axial direction, and the inner wall of the limiting ring is provided with an axially penetrating limiting groove. The limiting strip and the limiting groove are slidably engaged to limit the circumferential position of the rod part and the telescopic part; the protruding end is provided with a spherical surface, and a plurality of the air outlets are all located on the peripheral wall of the spherical surface.

[0016] For example, in a polishing apparatus for processing filter housings provided in at least one embodiment of the present invention, the polishing unit further includes:

[0017] A venting ring is sleeved on the outer periphery of the grinding rod and is used to supply high-pressure gas into the air supply chamber. The grinding rod is circumferentially rotatable relative to the venting ring. The inner peripheral wall of the venting ring has an annular groove that communicates with the air passage.

[0018] For example, in a grinding device for processing filter housing provided in at least one embodiment of the present invention, the inner peripheral wall of the vent ring is provided with a sealing protrusion protruding towards the axial side, there are two sealing protrusions located on both sides of the ring groove, and two circumferentially extending sealing grooves are provided on the outer peripheral wall of the grinding rod, which correspond one-to-one with the sealing protrusions, and the sealing protrusions are located in the sealing grooves.

[0019] For example, in a polishing device for processing a filter housing provided in at least one embodiment of the present invention, a plurality of circumferentially distributed polishing blocks are connected between the rod body and the telescopic part, and the polishing blocks are hinged to the end of the rod body via a first connecting rod; a slip ring is slidably sleeved on the telescopic part; the polishing blocks are hinged to the slip ring via a second connecting rod; when the telescopic part retracts to the first inner cavity, the slip ring can slide close to the rod body so that the plurality of polishing blocks can expand synchronously and press against the inner wall of the filter housing.

[0020] For example, in a grinding device for processing filter housing provided in at least one embodiment of the present invention, the outer wall of the limiting strip has a return protrusion, the return protrusion is located at the end of the limiting strip away from the air outlet, the return protrusion can drive the slip ring away from the rod body when the telescopic part extends outward, and the inner peripheral wall of the first inner cavity is provided with a return groove for sliding cooperation with the return protrusion.

[0021] For example, in a grinding device for processing filter housing provided in at least one embodiment of the present invention, a radially penetrating adjusting pin is threaded onto the slip ring, and the adjusting pin is used to abut against the peripheral wall of the telescopic part to increase the sliding friction with the telescopic part.

[0022] The beneficial effects of the embodiments of the present invention are as follows:

[0023] In this invention, the air supply chamber, air passage, and air outlet are interconnected, allowing the grinding rod to perform both grinding and cleaning functions. When high-pressure gas is ejected through the angled air outlet, it forms a spiral airflow within the housing cavity, effectively impacting areas prone to debris accumulation, such as inner wall recesses and bottom corners. Compared to the existing method of manually blowing each part individually, this significantly improves cleaning efficiency and eliminates the need for tool changes. The overall structure integrates positioning, grinding, and cleaning functions into a single device, reducing workpiece turnover and shortening the processing cycle. It is particularly suitable for filter housings with deep cavities or complex internal wall structures. The structural design solves the technical problem of difficult debris removal, ensuring the cleanliness of the housing interior, reducing the risk of filter element clogging during subsequent use, and improving the overall performance of the filter. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of the present invention and these drawings without any creative effort.

[0025] Figure 1 This is a schematic diagram of a grinding device for processing a filter housing according to one embodiment of the present invention;

[0026] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0027] Figure 3 for Figure 1 A schematic diagram of the horizontal cross-sectional structure of the grinding device in the embodiment;

[0028] Figure 4 for Figure 3 Enlarged view at point B in the middle;

[0029] Figure 5 for Figure 4 Enlarged view at point C;

[0030] Figure 6 for Figure 4 Enlarged view at point D;

[0031] Figure 7 for Figure 1 A schematic diagram of the vertical cross-sectional structure of the grinding device in the embodiment;

[0032] Figure 8 for Figure 7 Enlarged view at point E in the middle;

[0033] Figure 9 for Figure 8 Enlarged view at point F;

[0034] Figure 10 for Figure 1 A schematic diagram of the horizontal cross-sectional structure of the grinding device in operation in the embodiment;

[0035] Figure 11 for Figure 10 Enlarged view of point G in the middle.

[0036] In the diagram: 11. Worktable; 2. Positioning unit; 3. Grinding unit; 4. Filter housing; 31. Slide table; 39. Grinding rod; 391. Air supply chamber; 322. Air passage hole; 32. Rod body; 33. Grinding block; 321. First inner cavity; 34. Telescopic part; 341. Second inner cavity; 342. Sliding end; 3421. Sealing plate; 343. Air inlet; 344. Extended end; 345. Air outlet. 35. Limiting block; 36. Limiting ring; 37. Elastic element; 351. Receiving groove; 346. Limiting strip; 361. Limiting groove; 347. Spherical surface; 38. Vent ring; 381. Ring groove; 383. Sealing protrusion; 323. Sealing groove; 331. First connecting rod; 332. Slip ring; 333. Second connecting rod; 3461. Returning protrusion; 3211. Returning slide groove; 334. Adjusting pin. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it.

[0038] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0039] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0042] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0043] like Figures 1-6The diagram illustrates a grinding apparatus for processing a filter housing according to an embodiment of the present invention. The worktable 11 is a horizontally arranged base plate, with linear guide rails fixedly mounted on its upper surface along the front-to-back direction. The positioning unit 2 includes a positioning base located in the middle of the worktable 11. The positioning base is equipped with a group of positioning rollers adapted to the shape of the filter housing 4. Several positioning rollers are arranged side-by-side, forming positioning grooves between each other. A pneumatic clamping block is positioned above the positioning grooves. The pneumatic clamping block is driven by a cylinder to extend and retract radially, used to press against the outer periphery of the filter housing 4 for fixation. A drive motor is connected to one end of one of the positioning rollers, which can drive the filter housing 4 to rotate after clamping it, so that the rotation direction of the filter housing 4 is opposite to that of the grinding rod 39. The bottom of the slide table 31 of the grinding unit 3 is equipped with a slider that slides in cooperation with the linear guide rail. The slide table 31 is driven by a pneumatic cylinder at the rear end of the worktable 11 to slide back and forth along the guide rail. A transmission mechanism consisting of a motor, a synchronous belt, and a bearing seat is set on the slide table 31. A triangular chuck is installed at the front end of the rotating shaft of the transmission mechanism to clamp the rear end of the grinding rod 39. The grinding rod 39 is a hollow tubular structure with its front end extending towards the positioning unit 2. A grinding layer is fixedly set on its outer peripheral wall. An axially penetrating air supply chamber 391 is formed inside the rod. Radial air passage holes 322 are evenly opened on the peripheral wall of the grinding rod 39 in the area near the rear end of the slide table 31. The air passage holes 322 are connected to an external high-pressure air source through a pneumatic hollow slip ring 332, thereby communicating with the air supply chamber 391 to achieve air passage communication in the rotating state. Multiple air outlet holes 345 are distributed axially along the front peripheral wall. Each air outlet hole 345 is an oblique through hole with an inclination angle facing the outer side of the front end of the grinding rod 39.

[0044] The workflow is as follows: The filter housing 4 is placed in the positioning groove formed by the positioning roller group. The cylinder is activated to extend the pneumatic clamping block radially, pressing it against the outer circumference of the housing to complete positioning. The pneumatic cylinder drives the slide table 31 to move forward along the linear guide rail, causing the grinding rod 39 to extend into the inner cavity of the housing. Simultaneously, the transmission mechanism of the slide table 31 drives the grinding rod 39 to rotate, and the outer circumferential grinding layer performs circumferential grinding on the inner wall of the housing. During or after grinding, a high-pressure air source introduces high-pressure gas into the air supply chamber 391 through the air connector and air passage 322. The gas is ejected obliquely through the front air outlet 345, forming an airflow towards the opening end of the housing, blowing away residual debris from the inner wall. The positioning unit 2 can be replaced with a manual screw clamping or vacuum adsorption structure. The slide table 31 drive mechanism can be driven by a motor-driven lead screw nut or a linear motor directly driven to adapt to different levels of automation processing requirements.

[0045] The positioning roller assembly of positioning unit 2, in conjunction with the pneumatic clamping block, enables rapid positioning and rigid fixation of the filter housing 4, ensuring that the housing axis is coaxial with the grinding rod 39 axis, providing a benchmark for grinding accuracy. The slide table 31 achieves smooth sliding through the cooperation of linear guide rails and sliders. Pneumatic cylinders or motor drives ensure the grinding rod 39 accurately enters and exits the inner cavity of the housing, avoiding the risks of manual operation and improving equipment safety. The circumferential rotation of the grinding rod 39 allows for uniform grinding of the entire circumference of the filter housing 4's inner wall. Combined with the feed motion of the slide table 31, it can adapt to the processing of inner cavities of different depths and diameters. The through-hole design of the air supply chamber 391, air passage 322, and air outlet 345 allows the grinding rod 39 to perform both grinding and cleaning functions. When high-pressure gas is ejected through the angled air outlet 345, it forms a spiral airflow in the inner cavity of the housing, effectively impacting areas prone to debris accumulation, such as inner wall recesses and bottom corners. Compared to the manual blowing method used in existing technologies, this significantly improves cleaning efficiency and eliminates the need to change tools. The air vent is connected to the air source via a pneumatic hollow slip ring 332, ensuring continuous airflow when the grinding rod 39 rotates. This allows for simultaneous or sequential execution of grinding and cleaning processes, avoiding the drawback of needing to transfer the workpiece for secondary cleaning after grinding in traditional processes. The overall structure integrates positioning, grinding, and cleaning functions into a single device, reducing workpiece turnover and shortening the processing cycle. It is particularly suitable for filter housings 4 with deep cavities or complex inner wall structures. The structural design solves the technical problem of difficult debris removal, ensuring the cleanliness of the housing interior, reducing the risk of filter element clogging during subsequent use, and improving the overall performance of the filter.

[0046] like Figures 3-9 As shown, the grinding rod 39 includes a rod body 32 and a telescopic part 34. The rod body 32 is clamped by a rotatable triangular chuck provided on the slide table 31, and the front end opening forms a first inner cavity 321, with a grinding layer provided on the outer peripheral wall. The telescopic part 34 is slidably connected to the first inner cavity 321, and the inner second inner cavity 341 communicates with the first inner cavity 321 to form an air supply cavity 391. The air outlet 345 is located at the extended end of the telescopic part 34 away from the rod body 32. An elastic element 37 is provided in the first inner cavity 321, with one end abutting against the rod body 32 and the other end abutting against the telescopic part 34. Under normal conditions, it elastically pushes the telescopic part 34 so that its extended end pre-extends from the rod body 32. The sliding end 342 of the telescopic part 34 is provided with a sealing plate 3421 to block the second inner cavity 341, and a circumferentially fixed limiting block 35. The inner wall of the opening end of the first inner cavity 321 is provided with a limiting ring 36, which protrudes towards the axial side and corresponds to the limiting block 35. When the telescopic part 34 extends to its limit position, the limiting block 35 abuts against the limiting ring 36, and the inner wall of the limiting ring 36 blocks the air inlet 343 on the circumferential wall of the sliding end 342 to cut off the air passage. The outer circumferential wall of the telescopic part 34 is provided with an axially extending limiting strip 346, which slides and engages with the limiting groove 361 on the inner wall of the limiting ring 36 to restrict circumferential rotation. The extended end is provided with a spherical surface 347, and the air outlet 345 is evenly distributed on the circumferential wall of the spherical surface 347, with the axis forming an angle with the radial direction of the spherical surface 347.

[0047] During operation, the slide table 31 moves the grinding rod 39 towards the filter housing 4. The extended end of the telescopic part 34 first contacts the bottom of the housing and retracts into the first inner cavity 321 under resistance, causing the air outlet 345 of the air supply chamber 391 to penetrate deep into the inner cavity of the housing. At this time, the slide table 31 continues to move, and the grinding layer on the outer periphery of the rod body 32 begins to adhere to the inner wall. Simultaneously, the limiting block 35 separates from the limiting ring 36, and the first inner cavity 321 and the second inner cavity 341 are connected under the action of the air inlet 343, so that the air outlet 345 can blow out high-pressure gas from deep within the filter housing 4. At the same time, the drive mechanism drives the grinding rod 39 to rotate for grinding. The high-pressure gas is ejected obliquely from the air outlet 345 of the spherical surface 347 through the air supply chamber 391, forming a spiral airflow around the axis of the grinding rod 39, blowing away debris from the inside out. The advantage of the spherical surface 347 is that it can ensure that the quality of the inner wall of the filter housing 4 is not damaged. After the grinding and polishing is completed, the slide table 31 begins to retract under the drive of the cylinder, the elastic element 37 pushes the telescopic part 34 to reset, and the telescopic part 34 will gradually retract into the rod body 32 to the extended state; the air outlet 345 moves outward accordingly, and the limiting ring 36 blocks the air inlet 343 to stop the air supply.

[0048] The sliding connection design between the elastic element 37 and the telescopic part 34 allows the extended end of the telescopic part 34 to enter the inner cavity of the outer shell before the rod part 32. Through the retraction action, the air outlet 345 is precisely controlled to penetrate deep into the bottom of the outer shell, achieving directional blowing of high-pressure gas from the inside out. This effectively removes debris deep within the inner cavity and at corners, avoiding debris retention caused by traditional outside-to-in blowing. The mechanical linkage structure of the limiting block 35 and the limiting ring 36 limits the sliding range of the telescopic part 34 while automatically switching the air path through the opening and closing of the air inlet 343, guiding gas only in the effective working area, improving air source utilization efficiency and preventing leakage during non-working states. The circumferential limiting design of the limiting strip 346 and the limiting groove 361 ensures that the direction of the spherical air outlet 345 at the extended end of the telescopic part 34 remains stable. Combined with the angled spray hole of the spherical structure 347, the high-pressure gas forms a stable spiral airflow within the inner cavity of the shell, fully covering the inner wall and penetrating deep into recessed areas, solving the problem of cleaning dead corners in complex shell structures. The segmented connection and elastic buffering mechanism of the air supply chamber 391 reduces the impact of debris accumulation on the grinding quality through synchronous blowing, thereby achieving a synergistic improvement in grinding efficiency and cleaning effect.

[0049] like Figure 5As shown, the grinding unit 3 includes a vent ring 38, which is sleeved on the outer periphery of the grinding rod 39 and fixed to the slide table 31. An annular groove 381 is formed on the inner wall of the vent ring 38, which communicates with the air passage hole 322 on the peripheral wall of the grinding rod 39. The vent ring 38 is connected to an external high-pressure air source via a pneumatic hollow slip ring 332. Two sealing protrusions 383 are provided on the inner peripheral wall of the vent ring 38, located on both sides of the annular groove 381 and engaging with the sealing groove 323 on the outer peripheral wall of the grinding rod 39 to form a labyrinthine sealing structure. The minute gap between the sealing protrusions 383 and the sealing groove 323 forms an air film under the action of high-pressure gas. The grinding rod 39 can rotate circumferentially relative to the vent ring 38. During rotation, the air passage hole 322 remains in communication with the annular groove 381, ensuring a continuous input of high-pressure gas into the air supply chamber 391.

[0050] The design of the annular groove 381 in the vent ring 38 solves the problem of connecting the rotating parts with the static air path. This allows high-pressure gas to be stably delivered through the air supply chamber 391 to the air outlet 345 even during high-speed rotation of the grinding rod 39, enabling simultaneous grinding and cleaning processes without machine downtime and significantly improving processing efficiency. The labyrinth seal structure, through its self-tightening gas film characteristics, automatically enhances the sealing effect as the air pressure increases, effectively avoiding the wear and aging problems caused by friction in traditional mechanical seals, and significantly improving the reliability and service life of the air path system. The combination of dynamic air path connectivity and high-efficiency sealing ensures that high-pressure gas can be continuously and stably ejected from the air outlet 345, forming a stable directional airflow, which is particularly suitable for continuous processing of deep cavity shells, reducing process intervals and improving overall processing efficiency.

[0051] like Figure 4 , Figure 6 , Figure 10 and Figure 11As shown, a grinding block 33 is circumferentially hinged to the front end of the rod body 32. The grinding block 33 is connected to the rod body 32 via a first connecting rod 331, and the other end is hinged to a slip ring 332 that is slidably sleeved on the telescopic part 34 via a second connecting rod 333. A return protrusion 3461 is provided on the outer wall of the limiting strip 346 provided on the outer wall of the telescopic part 34 at the end away from the air outlet 345. A return groove 3211 is provided on the inner wall of the first inner cavity 321, and the return protrusion 3461 and the return groove 3211 are slidably engaged. When the telescopic part 34 retracts into the first inner cavity 321, the return protrusion 3461 releases the axial constraint on the slip ring 332. Under the sliding retraction action of the telescopic part 34, the slip ring 332 gradually approaches the rod body 32, causing the polishing blocks 33 to expand synchronously and gradually press against the inner wall of the filter housing 4. After polishing is completed, the slide table 31 begins to retract under the drive of the cylinder. When the telescopic part 34 gradually extends outward from the rod body 32 under the action of the elastic element 37, the return protrusion 3461 slides along the return groove 3211 and pushes the slip ring 332 away from the rod body 32, causing the first connecting rod 331 and the second connecting rod 332 to swing, so that the polishing blocks 33 are completely retracted. The slip ring 332 is threaded with a radially penetrating adjusting pin 334. The end of the adjusting pin 334 can abut against the peripheral wall of the telescopic part 34. By turning the adjusting pin 334, the contact pressure between the adjusting pin 334 and the telescopic part 34 can be changed, thereby adjusting the sliding friction between the slip ring 332 and the telescopic part 34.

[0052] The linkage mechanism and the linkage protrusion 3461 enable the grinding block 33 to automatically and precisely adjust its radial position according to the axial displacement of the telescopic part 34, achieving adaptive fitting to the inner walls of housings with different inner diameters without the need for an additional power source or complex control system. The cooperation between the return protrusion 3461 and the return groove 3211 ensures that the movement of the slip ring 332 and the telescopic part 34 is strictly synchronized, preventing the grinding block 33 from getting stuck or lagging during expansion or contraction, ensuring the uniformity and stability of the grinding pressure, and effectively avoiding uneven grinding or damage to the inner wall caused by differences in inner diameter. The setting of the adjusting pin 334 provides an adjustable mechanism for the friction between the slip ring 332 and the telescopic part 34, allowing the operator to adjust the expansion speed and fitting force of the grinding block 33 in real time according to process parameters such as the material hardness and inner wall roughness of the filter housing 4. This flexibility allows the device to adapt to various processing needs, avoiding jamming of the telescopic part 34 due to excessive friction or insufficient fit of the grinding block 33 due to excessively small size, thus improving the device's process adaptability and controllability of processing accuracy. During the cleaning stage, the retracted grinding block 33 reduces obstruction to airflow, allowing high-pressure gas to more directly impact the inner wall surface, enhancing the purging effect and further improving debris removal efficiency.

[0053] The complete workflow is as follows: Place the filter housing 4 into the positioning groove formed by the positioning roller group. Activate the cylinder to extend the pneumatic clamping block radially, pressing it against the outer circumference of the housing to complete positioning. If necessary, the filter housing 4 can be rotated by a drive motor connected to one end of the positioning roller, with its rotation direction opposite to that of the grinding rod 39. Next, the pneumatic cylinder drives the slide table 31 to move forward along the linear guide rail. The slider at the bottom of the slide table 31 cooperates with the linear guide rail to achieve smooth sliding, driving the grinding rod 39 to extend into the inner cavity of the housing.

[0054] During the movement of the grinding rod 39, the extended end of its telescopic part 34 first contacts the bottom of the outer shell and retracts into the first inner cavity 321 under the action of resistance, causing the air outlet 345 of the air supply chamber 391 to penetrate deep into the inner cavity of the outer shell. Then, the slide table 31 continues to move, and the grinding layer on the outer periphery of the rod body 32 begins to adhere to the inner wall. At this time, the transmission mechanism on the slide table 31 drives the grinding rod 39 to rotate, and the outer peripheral grinding layer performs circumferential grinding on the inner wall of the shell. At the same time, the high-pressure air source introduces high-pressure gas into the air supply chamber 391 through the vent ring 38 and the air passage 322. The gas is ejected obliquely through the air outlet 345 on the peripheral wall of the front spherical surface 347, forming a spiral airflow around the axis of the grinding rod 39, which blows away the debris generated during the grinding process from the inside to the outside.

[0055] When the telescopic part 34 retracts into the rod body 32 and is in the working position, the limiting block 35 separates from the limiting ring 36, and the air inlet 343 is open to ensure a continuous supply of high-pressure gas. If the inner diameter of the filter housing 4 is different, when the telescopic part 34 retracts into the first inner cavity 321, the return protrusion 3461 releases the axial constraint on the slip ring 332. Under the sliding retraction action of the telescopic part 34, the slip ring 332 gradually approaches the rod body 32. Through the first connecting rod 331 and the second connecting rod 333, the grinding block 33 expands synchronously and presses against the inner wall of the filter housing 4. The operator can adjust the sliding friction between the slip ring 332 and the telescopic part 34 by turning the adjusting pin 334 on the slip ring 332 according to the material and other parameters of the filter housing 4, and control the expansion speed and contact force of the grinding block 33.

[0056] After grinding and polishing are completed, the slide table 31 begins to retract under the action of the cylinder. The telescopic part 34 gradually extends outward from the rod part 32 under the action of the elastic element 37. The return protrusion 3461 slides along the return groove 3211 and pushes the slip ring 332 away from the rod part 32, so that the grinding block 33 is completely retracted. As the telescopic part 34 extends to its limit position, the limiting block 35 abuts against the limiting ring 36. The inner wall of the limiting ring 36 blocks the air inlet 343 on the peripheral wall of the sliding end 342, cuts off the air passage, stops the air supply, and the air outlet 345 moves outward, completing the entire grinding and cleaning process.

[0057] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A polishing apparatus for processing a filter housing, comprising a worktable (11), a positioning unit (2) disposed on the worktable (11) for fixing a filter housing (4), and a polishing unit (3) for extending into the filter housing (4) to polish the inner wall of the filter housing (4); characterized in that, The polishing unit (3) includes: The slide (31) is slidably disposed on the worktable (11) and can slide close to the positioning unit (2). A grinding rod (39) is rotatably mounted on the slide table (31) around an axis and extends toward the side close to the positioning unit (2). The grinding rod (39) has an air supply chamber (391) inside. The peripheral wall of the grinding rod (39) has an air passage (322) for introducing high-pressure gas into the air supply chamber (391) and an air outlet (345) for discharging the high-pressure gas. The grinding rod (39) can enter the filter housing (4) under the sliding motion of the slide table (31) and grind the inner wall of the filter housing (4). The grinding rod (39) can also introduce high-pressure gas into the filter housing (4) through the air outlet (345) to blow out the debris inside the filter housing (4). The grinding rod (39) includes: The rod body (32) is rotatably connected to the slide (31). The rod body (32) has a first inner cavity (321) that opens toward the positioning unit (2). The rod body (32) is used to polish the inner wall of the filter housing (4). The telescopic part (34) is slidably connected to the first inner cavity (321). The telescopic part (34) has a second inner cavity (341) communicating with the first inner cavity (321). The first inner cavity (321) and the second inner cavity (341) together form the air delivery cavity (391). The air outlet (345) is located at the end of the telescopic part (34) away from the rod body (32). An elastic element (37) is provided in the first inner cavity (321). The elastic element (37) is used to elastically push the telescopic part (34) so ​​that the telescopic part (34) extends out of the rod part (32). The telescopic part (34) has a sliding end (342) slidably connected to the first inner cavity (321) and an extension end (344) extending out of the rod part (32). The sliding end (342) is provided with a sealing plate (3421) for sealing the second inner cavity (341). The peripheral wall of the sliding end (342) is provided with an air inlet (343) communicating with the second inner cavity (341). A plurality of circumferentially spaced limiting blocks (35) are fixedly connected to the outer periphery of the sliding end (342). The opening end of the first inner cavity (321) is provided with a limiting ring (36) protruding towards the axis. The inner peripheral wall of the limiting ring (36) slides with the outer peripheral wall of the telescopic part (34). The limiting ring (36) is used to abut against the limiting block (35) to limit the sliding range of the telescopic part (34) relative to the rod part (32). The limiting ring (36) can also block the air inlet (343) when it abuts against the limiting block (35) to prevent high-pressure gas from entering the second inner cavity (341).

2. The polishing apparatus for processing a filter housing according to claim 1, wherein The limiting block (35) has a receiving groove (351) on the end face near the elastic member (37) for accommodating the end of the elastic member (37).

3. The grinding device for processing filter housings according to claim 1, characterized in that, The outer peripheral wall of the telescopic part (34) has a limiting strip (346) extending along the axial direction. The inner wall of the limiting ring (36) is provided with an axially penetrating limiting groove (361). The limiting strip (346) and the limiting groove (361) slide together to limit the circumferential position of the rod part (32) and the telescopic part (34). The protruding end (344) is provided with a spherical surface (347), and a plurality of the air outlets (345) are located on the peripheral wall of the spherical surface (347).

4. The polishing apparatus for processing a filter housing according to claim 3, wherein The polishing unit (3) also includes: A venting ring (38) is sleeved on the outer periphery of the grinding rod (39) and is used to supply high-pressure gas into the air supply chamber (391). The grinding rod (39) can rotate circumferentially relative to the venting ring (38). The inner peripheral wall of the venting ring (38) has an annular groove (381) that communicates with the air passage (322).

5. The polishing apparatus for processing a filter housing according to claim 4, wherein The inner peripheral wall of the vent ring (38) is provided with a sealing protrusion (383) that protrudes towards the axial side. There are two sealing protrusions (383) and they are located on both sides of the ring groove (381). The outer peripheral wall of the grinding rod (39) is provided with two circumferentially extending sealing grooves (323) that correspond one-to-one with the sealing protrusions (383). The sealing protrusions (383) are located in the sealing grooves (323).

6. The polishing apparatus for processing a filter housing according to claim 5, wherein A plurality of circumferentially distributed grinding blocks (33) are connected between the rod body (32) and the telescopic part (34). The grinding blocks (33) are hinged to the end of the rod body (32) through a first connecting rod (331). A slip ring (332) is slidably sleeved on the telescopic part (34). The grinding blocks (33) are hinged to the slip ring (332) through a second connecting rod (333). When the telescopic part (34) retracts to the first inner cavity (321), the slip ring (332) can slide close to the rod body (32) so that the plurality of grinding blocks (33) can expand synchronously and press against the inner wall of the filter housing (4).

7. The polishing apparatus for processing a filter shell according to claim 6, wherein The outer wall of the limiting strip (346) has a return protrusion (3461). The return protrusion (3461) is located at the end of the limiting strip (346) away from the air outlet (345). The return protrusion (3461) can drive the slip ring (332) away from the rod body (32) when the telescopic part (34) extends outward. The inner peripheral wall of the first inner cavity (321) is provided with a return groove (3211) for sliding cooperation with the return protrusion (3461).

8. The polishing apparatus for processing a filter shell according to claim 6, wherein The slip ring (332) is threaded with a radially penetrating adjusting pin (334), which is used to abut against the peripheral wall of the telescopic part (34) to increase the sliding friction with the telescopic part (34).

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