A kind of filtrate machine for PD plastic product processing

Abstract

The application relates to the technical field of plastic processing equipment, and discloses a filtrate machine for PD plastic product processing, which is used to solve the problems of the solidification aging phenomenon of molten PD plastic at the edge of a filter chamber and the serious waste of PD plastic in the filter chamber during cleaning of a filter core. An outer shaft sleeve and an inner shaft sleeve are movably arranged outside the filter core, the side wall of the outer shaft sleeve is provided with a transfer groove with a first permanent magnetic strip, the inner wall of the filter cylinder is embedded with a permanent magnetic ring, and the middle position of the filter cylinder is provided with a second permanent magnetic strip. The PD plastic at the edge is transferred to the middle position of the filter cylinder through cooperation of the first permanent magnetic strip, the permanent magnetic ring and the second permanent magnetic strip, so that the solidification aging phenomenon of the PD plastic is avoided. The filter cylinder is provided with a threaded pushing ring and a pushing rod, which can make the inner shaft sleeve ascend and descend. During cleaning, the outer shaft sleeve and the inner shaft sleeve are closed, impurity-removing solution and impurities pass through the ring groove, the impurity ring hole and the impurity-removing pipe, and are discharged, the molten PD plastic in the filter cylinder is retained, and the discharge amount of waste is reduced.

Description

Technical Field

[0001] This application relates to the field of plastic processing equipment technology, and in particular to a filtration machine for processing PD plastic products. Background Technology

[0002] PD plastic is an abbreviation for polydimethylsiloxane, also known as silicone rubber. It is a colorless, transparent organic polymer material with good high temperature resistance and high chemical stability. In the processing of PD plastic products, the PD plastic first needs to be placed in a melting machine for melting. Since impurities are inevitably mixed into the molten PD plastic, and some impurities cannot be melted after heating, or some raw material particles are large and may not be completely melted when heated, it is necessary to filter the impurities or unmelted particles in the molten PD plastic. Only after filtering can the PD plastic be molded to produce the corresponding products.

[0003] The filter chamber of the melt filter contains multiple filter elements. Molten PD plastic enters from the feed pipe at the bottom of the filter chamber and enters the filter element for filtration after the filter chamber is full. Since the molten PD plastic in the filter chamber flows freely into the filter element, the PD plastic in the middle of the filter chamber is easily squeezed into the filter element by the newly entering PD plastic below. However, the PD plastic at the edge of the filter chamber is not subject to external force and may remain there for a long time. PD plastic will solidify and age after remaining at its melting point temperature for tens of minutes, affecting the subsequent molding process. Furthermore, when the filter element of the existing melt filter is clogged, the impurity removal solution is reversed through the discharge pipe, and then the impurities clogging the filter element are discharged into the filter chamber. Then, the molten PD plastic in the filter chamber is discharged from the feed pipe along with the impurities. In this process, a great deal of waste occurs in the unfiltered molten PD plastic in the filter chamber. Summary of the Invention

[0004] This application proposes a filtration machine for processing PD plastic products, which has the advantages of preventing molten PD plastic from staying at the edge of the filter chamber for a long time and saving raw materials when cleaning the filter element. It solves the problems of molten PD plastic solidifying and aging at the edge of the filter chamber and serious waste of PD plastic in the filter chamber when cleaning the filter element.

[0005] To achieve the above objectives, this application adopts the following technical solution: a filtration machine for processing PD plastic products, comprising a filter cylinder, a lower cylinder cover, and an upper cylinder cover. The lower cylinder cover is equipped with an inlet pipe, and the upper cylinder cover is equipped with a discharge pipe. Filter elements are arranged in a circular array between the lower and upper cylinder covers. Annular grooves are formed on the upper surface of the lower cylinder cover, with each groove located outside the bottom end of the filter element. A power motor and a transmission gear are embedded in the middle of the top of the upper cylinder cover, and the transmission gear is fixedly mounted on the transmission mechanism of the power motor. On the shaft; an inner bushing is movably fitted on the outer side of the filter element, and the bottom end of the inner bushing is slidably sealed and installed in the annular groove of the lower cylinder cover. An outer bushing is movably fitted on the outer side of the inner bushing. Several material passage holes are opened on the outer bushing and the inner bushing. The material passage holes of the inner bushing are connected to the material passage holes of the outer bushing. The bottom end of the outer bushing is placed on the top end of the lower cylinder cover, and the top end of the outer bushing is movably sealed and installed in the upper cylinder cover. An external gear is fixedly fitted on the top end of the outer bushing inside the upper cylinder cover. The external gear meshes with the transmission gear.

[0006] Furthermore, several sets of sliding cylinders are equidistantly installed on the side wall of the outer bushing. A limiting groove is formed on the inner wall of each sliding cylinder. Each sliding cylinder contains a slider, a sliding rod, a transmission spring, and a limiting block. The slider is slidably installed at one end inside the sliding cylinder, passing through the outer bushing and pressing against the side wall of the inner bushing. The sliding rod is slidably installed at the other end inside the sliding cylinder. The transmission spring is located between the slider and the sliding rod. The limiting block is embedded in the side wall of the sliding rod and is slidable. The limiting block and the limiting groove are compatible. An air storage groove is provided at one end of the slide rod on the outside of the slide cylinder. A through hole is provided at the axis of the slide rod, connecting the air storage groove and the bottom end of the limiting block. A sealing block is slidably and sealed in the air storage groove. The same first permanent magnet strip is fixedly connected to the sealing block on the same side. A transfer groove is movably sleeved on the outside of the first permanent magnet strip. The transfer groove is fixedly installed on the slide cylinder. A permanent magnet ring is embedded in the inner wall of the filter cylinder. Several second permanent magnet strips parallel to the center line of the filter cylinder are fixedly installed in the middle position inside the filter cylinder.

[0007] Furthermore, the outer bushing and the inner bushing cannot rotate relative to each other, but can slide relative to each other axially.

[0008] Furthermore, the permanent magnet ring, the first permanent magnet strip, and the second permanent magnet strip are high-temperature resistant permanent magnets. The permanent magnet ring and the first permanent magnet strip generate a repulsive force, while the first permanent magnet strip and the second permanent magnet strip generate a mutual attractive force.

[0009] Furthermore, a push rod is movably installed at the bottom end of the annular groove, the bottom end of the push rod passes through the lower cylinder cover, and the outer side of the push rod is provided with an external thread. The bottom end of the lower cylinder cover is provided with a rotatable threaded push ring, and the inner side of the threaded push ring is provided with an internal thread that matches the external thread of the push rod. A guide port is provided on the lower cylinder cover between the inner bushing and the filter element. An impurity ring hole communicating with the bottom end of the annular groove is provided on the inner side of the lower cylinder cover. A discharge pipe communicating with the impurity ring hole is fixedly installed on one side of the bottom end of the lower cylinder cover.

[0010] Furthermore, the thickness of the push rod is less than the thickness of the inner bushing.

[0011] Furthermore, the edge of the slider that is in close contact with one end of the inner bushing is set as an inclined surface.

[0012] This application has the following beneficial effects:

[0013] 1. This application provides a filtration machine for processing PD plastic products, comprising an outer bushing and an inner bushing movably fitted around the filter element, with a material passage hole on the outer bushing and the inner bushing communicating with each other. The side wall of the outer bushing is provided with a sliding cylinder, a sliding rod, a sealing block, and a first permanent magnet strip. A transfer groove is provided on the outer side of the first permanent magnet strip, and the transfer groove is connected to the sliding cylinder. A permanent magnet ring is embedded in the inner wall of the filter cylinder, and a second permanent magnet strip is located in the middle of the filter cylinder. When the transfer groove passes through the side wall of the filter cylinder, the permanent magnet ring and the first permanent magnet strip generate a repulsive force. The filter cartridge slides into the transfer trough, the transfer trough opening allows PD plastic from the edge of the filter cartridge wall to enter the transfer trough. As the outer bushing continues to rotate, the first permanent magnet strip passes the second permanent magnet strip, which attracts the first permanent magnet strip, causing the first permanent magnet strip to reset. This forces the PD plastic in the transfer trough to be squeezed out, thereby transferring the PD plastic from the edge of the filter cartridge wall to the middle of the filter cartridge. This prevents the PD plastic from remaining on the filter cartridge wall for a long time and thus avoids the aging phenomenon of solidification of the PD plastic.

[0014] 2. The filtration machine for processing PD plastic products provided in this application has a guide port on the lower cylinder cover between the inner bushing and the filter element. The bottom end of the lower cylinder cover is provided with a threaded push ring and a push rod to control the lifting and lowering of the inner bushing. The lower cylinder cover has an impurity ring hole and a discharge pipe communicating with the annular groove. When the filter element is blocked and needs to be cleaned, the inner bushing is lifted by the threaded push ring and the push rod, so that the material passage holes of the inner bushing and the outer bushing are blocked. At this time, the annular space between the inner bushing and the filter element is connected to the annular groove, the impurity ring hole and the discharge pipe in sequence. During cleaning, the discharge solution is introduced through the discharge pipe. The discharge solution passes through the filter element and flushes the impurities into the annular space between the filter element and the inner bushing. The discharge solution and impurities are discharged through the annular groove, the impurity ring hole and the discharge pipe. In this process, it is not necessary to discharge all the PD plastic in the filter cartridge as waste. Only the PD plastic between the inner bushing and the filter element needs to be discharged, which greatly saves the molten PD plastic in the filter cartridge and saves a certain amount of production costs. Attached Figure Description

[0015] The accompanying drawings, which form part of this specification, illustrate embodiments disclosed in this application and, together with the specification, serve to explain the principles disclosed in this application.

[0016] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description, wherein:

[0017] Figure 1 This is a schematic diagram of the structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the inner and outer bushing structures of the present invention;

[0019] Figure 3 For the present invention Figure 1 Enlarged view of the local structure at point A in the middle;

[0020] Figure 4 For the present invention Figure 3 Enlarged view of the local structure at point B;

[0021] Figure 5 For the present invention Figure 1 Sectional view at CC;

[0022] Figure 6 For the present invention Figure 1 Enlarged view of the local structure at point D.

[0023] In the diagram: 1. Filter cartridge; 101. Permanent magnet ring; 2. Lower cylinder cover; 201. Feed pipe; 202. Ring groove; 203. Guide port; 204. Impurity ring hole; 205. Impurity discharge pipe; 206. Threaded push ring; 207. Push rod; 3. Upper cylinder cover; 301. Power motor; 302. Transmission gear; 303. Discharge ring hole; 304. Discharge pipe; 4. Filter element; 5. Outer bushing; 501. External gear; 502. Slide cylinder; 503. Slider; 504. Transmission spring; 505. Slide rod; 506. Limiting block; 507. Limiting groove; 508. Through hole; 509. Air storage tank; 510. Sealing block; 511. First permanent magnet strip; 512. Transfer groove; 6. Inner bushing; 7. Second permanent magnet strip. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0025] Please see Figure 1 A filtration machine for processing PD plastic products includes a filter cylinder 1, a lower cover 2, and an upper cover 3. The filter cylinder 1 has a cylindrical structure. The lower cover 2 is fixedly installed at the bottom of the filter cylinder 1, and the upper cover 3 is fixedly installed at the top of the filter cylinder 1. The lower cover 2 and the upper cover 3 are respectively sealed to both ends of the filter cylinder 1. An inlet pipe 201 communicating with the filter cylinder 1 is fixedly installed at the center of the lower cover 2. A discharge ring hole 303 is opened in the upper cover 3, and a discharge pipe 304 communicating with the discharge ring hole 303 is fixedly installed on one side of the top of the upper cover 3. A plurality of filter elements 4 are arranged in a ring array at the upper end of the lower cover 2. The bottom end of the filter element 4 is inserted into the upper end face of the lower cover 2, and the top end of the filter element 4 is fixedly installed on the upper cover 3. The inner hole of the filter element 4 is communicating with the discharge ring hole 303.

[0026] Please see Figure 1 The upper end face of the lower cylinder cover 2 is provided with annular grooves 202, and each annular groove 202 is located on the outer side of the bottom end of the filter element 4.

[0027] Please see Figure 1A power motor 301 and a transmission gear 302 are embedded in the middle of the top of the upper cylinder cover 3. The transmission gear 302 is located at the bottom of the power motor 301 and is fixedly installed on the transmission shaft of the power motor 301. An inner bushing 6 is movably sleeved on the outer side of the filter element 4. The bottom end of the inner bushing 6 is slidably sealed in the annular groove 202 of the lower cylinder cover 2. Several material passage holes are opened on the inner bushing 6. An outer bushing 5 is movably sleeved on the outer side of the inner bushing 6. Several material passage holes are opened on the inner bushing 6, and the material passage holes of the inner bushing 6 are connected to the material passage holes of the outer bushing 5. The bottom end of the outer bushing 5 is placed on the top of the lower cylinder cover 2, and the top end of the outer bushing 5 is movably sealed in the upper cylinder cover 3. An outer gear 501 is fixedly sleeved on the top end of the outer bushing 5 inside the upper cylinder cover 3. The outer gear 501 meshes with the transmission gear 302.

[0028] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 Several sets of slide cylinders 502 are equidistantly installed on the side wall of the outer bushing 5. A slider 503 is slidably installed at one end of the slide cylinder 502. The slider 503 passes through the outer bushing 5 and abuts against the side wall of the inner bushing 6. A limit ring is fixedly installed on the inner wall of the port of the slide cylinder 502. A slide rod 505 is slidably installed at the other end of the slide cylinder 502. The slide rod 505 is slidably sealed with the limit ring. A transmission spring 504 is provided between the slide rod 505 and the slider 503. A slidable limit block 506 is embedded in the side wall of the slide rod 505. A limit groove 507 is opened on the inner wall of the slide cylinder 502. The limit groove 507 and the limit block 506 are adapted to each other and are located on the outside of the slide cylinder 502. One end of the slide rod 505 is provided with an air storage groove 509. The axis of the slide rod 505 is provided with a through hole 508 that connects the air storage groove 509 and the slide groove of the limiting block 506. A sealing block 510 is slidably and sealed in the air storage groove 509. The sealing block 510 on the same side is fixedly connected to the same first permanent magnet strip 511. A transfer groove 512 is movably sleeved on the outer side of the first permanent magnet strip 511. The transfer groove 512 is fixedly installed on the slide cylinder 502. A permanent magnet ring 101 is embedded in the inner wall of the filter cylinder 1. Several second permanent magnet strips 7 parallel to the center line of the filter cylinder 1 are fixedly installed in the middle position inside the filter cylinder 1. The second permanent magnet strips 7 do not obstruct the rotation of the transfer groove 512.

[0029] When not in operation, the first permanent magnet strip 511 blocks the material inlet of the transfer trough 512. When the first permanent magnet strip 511 slides to the inside of the transfer trough 512, the material inlet of the transfer trough 512 opens, and the transfer trough 512 can then receive molten PD plastic.

[0030] The outer bushing 5 and the inner bushing 6 cannot rotate relative to each other, but can slide relative to each other axially. If the outer bushing 5 and the inner bushing 6 can rotate relative to each other, the material passage holes of the outer bushing 5 and the inner bushing 6 may be blocked when the outer bushing 5 or the inner bushing 6 rotates, and the PD plastic in the filter cartridge 1 will no longer be able to enter the filter element 4, affecting the filtration operation.

[0031] The permanent magnet ring 101, the first permanent magnet strip 511, and the second permanent magnet strip 7 are high-temperature resistant permanent magnets. Since the melt filter operates at high temperatures, high-temperature resistant permanent magnets are used to prevent the permanent magnet ring 101, the first permanent magnet strip 511, and the second permanent magnet strip 7 from demagnetizing at high temperatures.

[0032] The permanent magnet ring 101 and the first permanent magnet strip 511 generate a repulsive force, while the first permanent magnet strip 511 and the second permanent magnet strip 7 generate a mutual attractive force.

[0033] Please see Figure 1 and Figure 6 A push rod 207 is movably installed at the bottom end of the annular groove 202. The bottom end of the push rod 207 passes through the lower cylinder cover 2. The outer side of the push rod 207 is provided with an external thread. A threaded push ring 206 is movably installed at the bottom end of the lower cylinder cover 2. The threaded push ring 206 can rotate relative to the lower cylinder cover 2. The inner side of the threaded push ring 206 is provided with an internal thread. The internal thread of the threaded push ring 206 is adapted to the external thread of the push rod 207 (the push rod 207 can be raised or lowered by rotating the threaded push ring 206). A guide port 203 is provided on the lower cylinder cover 2 between the inner bushing 6 and the filter element 4. The guide port 203 connects the annular space between the inner bushing 6 and the filter element 4 with the annular groove 202. An impurity ring hole 204 is provided on the inner side of the lower cylinder cover 2, which communicates with the bottom end of the annular groove 202. A discharge pipe 205 communicating with the impurity ring hole 204 is fixedly installed on one side of the bottom end of the lower cylinder cover 2.

[0034] The thickness of the push rod 207 is less than the thickness of the inner bushing 6. When the push rod 207 pushes up the inner bushing 6, the inner bushing 6 leaves the annular groove 202 and the push rod 207 enters the annular groove 202, the annular groove 202 will not be sealed, so the annular groove 202 is in a conductive state.

[0035] The edge of the slider 503, which is close to the inner bushing 6, is set as an inclined surface. If the slider 503 does not slide into the slide cylinder 502, when the inner bushing 6 is reset, the wall of the feed hole of the inner bushing 6 will press against the inclined surface of the slider 503, causing the slider 503 to slide into the slide cylinder 502, thus preventing the slider 503 from obstructing the movement of the inner bushing 6.

[0036] The working principle of this invention is as follows:

[0037] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 During operation, molten PD plastic is fed into filter cartridge 1 through feed pipe 201. The molten PD plastic in filter cartridge 1 enters filter element 4 through the feed holes of outer sleeve 5 and inner sleeve 6. After being filtered by filter element 4, the molten PD plastic is discharged through discharge pipe 304. During this process, power motor 301 is started, driving transmission gear 302 to rotate. Transmission gear 302 drives external gear 501 on outer sleeve 5 to rotate. Since outer sleeve 5 and inner sleeve 6 cannot rotate relative to each other, they rotate simultaneously. During the rotation of the outer bushing 5, the first permanent magnet strip 511 in the transfer groove 512 near the filter cartridge 1 generates a repulsive force with the permanent magnet ring 101. The first permanent magnet strip 511 is pushed by the permanent magnet ring 101, causing it to slide into the transfer groove 512. The material inlet of the transfer groove 512 opens, and the molten PD plastic at the edge of the filter cartridge 1 enters the transfer groove 512. At the same time, the first permanent magnet strip 511 pushes the sealing block 510 to slide in the gas storage tank 509. The sealing block 510 compresses the gas in the gas storage tank 509. The gas pushes the limiting block 506 through the through hole 508. Simultaneously, as the first permanent magnet strip 511 pushes the slide rod 505 into the slide cylinder 502, the limiting block 506 springs into the limiting groove 507, limiting the slide rod 505 and preventing the first permanent magnet strip 511 from resetting under the action of centrifugal force and the elastic force of the transmission spring 504. This prevents the molten PD plastic in the transfer trough 512 from being discharged before reaching the center of the filter cylinder 1. When the transfer trough 512 containing the molten PD plastic rotates to the center of the filter cylinder 1, the first permanent magnet strip in the transfer trough 512... The first permanent magnet 511 attracts the second permanent magnet strip 7, causing the first permanent magnet strip 511 to squeeze the molten PD plastic in the transfer groove 512. The molten PD plastic is discharged to the middle position of the filter cartridge 1. At the same time, the first permanent magnet strip 511 drives the sealing block 510 to slide outward of the air storage groove 509, generating a negative pressure in the air storage groove 509. The force of the negative pressure exerts an attraction on the limiting block 506 through the through hole 508, causing the limiting block 506 to disengage from the limiting groove 507. The limiting effect is canceled, and the sliding rod 505, sealing block 510, and first permanent magnet strip 511 return to their original positions. During this process, the transfer groove 512 continuously transfers the molten PD plastic at the edge of the filter cartridge 1 to the middle position of the filter cartridge 1, avoiding the molten PD plastic from remaining on the wall of the filter cartridge 1 for a long time without being filtered, thereby preventing the molten PD plastic from solidifying and aging.

[0038] When filter element 4 becomes clogged and needs cleaning, close the feed pipe 201 and connect the inlet of the discharge solution to the discharge pipe 304. Rotate the threaded push ring 206 to move the push rod 207 upwards. At this time, the push rod 207 lifts the inner bushing 6, causing the inner bushing 6 and outer bushing 5 to block the feed hole. The outer wall of the inner bushing 6 will no longer obstruct the slider 503, forming an annular space between the inner bushing 6 and the filter element 4. This annular space is connected to the impurity annular hole 204 through the guide port 203 and the annular groove 202. When the discharge solution enters the filter element 4 through the discharge pipe 304 to clean it... The flushing solution and impurities are flushed into the annular space between the inner bushing 6 and the filter element 4. Under the continued flushing action of the flushing solution, the flushing solution and impurities pass sequentially through the guide port 203, the annular groove 202, the impurity annular hole 204, and the flushing pipe 205, thereby discharging the flushing solution and impurities. When the flushing solution enters the filter element 4 through the discharge pipe 304 to clean the filter element 4, the power motor 301 starts simultaneously. The power motor 301 drives the transmission gear 302 to rotate, and the transmission gear 302 drives the outer gear 501 to rotate. The outer bushing 5 and the inner bushing 6 rotate simultaneously. During the rotation of the outer bushing 5, the first... A permanent magnet strip 511 generates a repulsive force with the permanent magnet ring 101. Under the action of the repulsive force, the first permanent magnet strip 511 slides into the transfer groove 512. The first permanent magnet strip 511 drives the sealing block 510 to slide into the gas storage groove 509, compressing the gas in the gas storage groove 509. At the same time, the gas in the gas storage groove 509 pushes the slide rod 505 to slide into the slide cylinder 502. During the process of the slide rod 505 sliding into the slide cylinder 502, the slide rod 505 compresses the transmission spring 504, causing the transmission spring 504 to push the slider 503 to slide. The slider 503 hits the frame of the filter element 4, causing the filter element 4 to vibrate, thereby causing the filter element 4 to vibrate. The impurities stuck inside move, making it easier for the impurity discharge solution to impact the impurities and strengthen the cleaning power of the impurity discharge solution on the filter element 4. When the transfer tank 512 rotates to the middle position of the filter cylinder 1, the second permanent magnet strip 7 and the first permanent magnet strip 511 generate an attraction. Under the attraction of the second permanent magnet strip 7, the first permanent magnet strip 511 slides towards the material inlet of the transfer tank 512. At the same time, the first permanent magnet strip 511 drives the sealing block 510 and the slide rod 505 to return to their original positions. At this time, a negative pressure is generated between the slide rod 505 and the slider 503. Under the action of the negative pressure, the slider 503 slides into the slide cylinder 502, so that the slider 503 returns to its original position.

Claims

1. A filtration machine for processing PD plastic products, comprising a filter cylinder (1), a lower cylinder cover (2) and an upper cylinder cover (3), wherein the lower cylinder cover (2) is equipped with an inlet pipe (201), the upper cylinder cover (3) is equipped with a discharge pipe (304), and filter elements (4) are arranged in a ring array between the lower cylinder cover (2) and the upper cylinder cover (3), characterized in that: The upper end face of the lower cylinder cover (2) is provided with annular grooves (202), and each annular groove (202) is located on the outer side of the bottom end of the filter element (4); A power motor (301) and a transmission gear (302) are embedded in the middle position of the top of the upper cylinder cover (3), and the transmission gear (302) is fixedly installed on the transmission shaft of the power motor (301). The filter element (4) is movably fitted with an inner bushing (6), the bottom end of the inner bushing (6) is slidably sealed and installed in the annular groove (202) of the lower cylinder cover (2), the outer bushing (5) is movably fitted with the outer bushing (6), the outer bushing (5) and the inner bushing (6) are provided with several material passage holes, the material passage hole of the inner bushing (6) is connected with the material passage hole of the outer bushing (5), the bottom end of the outer bushing (5) is placed on the top end of the lower cylinder cover (2), the top end of the outer bushing (5) is movably sealed and installed in the upper cylinder cover (3), the top end of the outer bushing (5) in the upper cylinder cover (3) is fixedly fitted with an external gear (501), the external gear (501) meshes with the transmission gear (302); Several sets of slide cylinders (502) are equidistantly installed on the side wall of the outer bushing (5). The inner wall of the slide cylinder (502) is provided with a limiting groove (507). The slide cylinder (502) is provided with: The slider (503) is slidably installed at one end inside the slide cylinder (502), and the slider (503) passes through the outer bushing (5) and abuts against the side wall of the inner bushing (6); A slide rod (505) is slidably mounted at the other end inside a slide cylinder (502); A transmission spring (504) is disposed between the slider (503) and the slide rod (505); A limiting block (506) is embedded in the side wall of the slide rod (505) and is slidable. The limiting block (506) and the limiting groove (507) are adapted to each other. An air storage groove (509) is provided at one end of the slide rod (505) located outside the slide cylinder (502). A through hole (508) is provided at the axis of the slide rod (505) to connect the air storage groove (509) and the bottom end of the limiting block (506). A sealing block (510) is slidably and sealed inside the air storage groove (509). The sealing blocks (510) on the same side are fixedly connected to the same first permanent magnet strip (511). A transfer groove (512) is movably sleeved on the outside of the first permanent magnet strip (511). The transfer groove (512) is provided with a material port. The transfer groove (512) is fixedly installed on the slide cylinder (502). The inner wall of the filter cylinder (1) is embedded with a permanent magnet ring (101), and a number of second permanent magnet strips (7) parallel to the center line of the filter cylinder (1) are fixedly installed in the middle position of the filter cylinder (1). The outer bushing (5) and the inner bushing (6) cannot rotate relative to each other, but can slide relative to each other axially; The permanent magnet ring (101), the first permanent magnet strip (511), and the second permanent magnet strip (7) are high-temperature resistant permanent magnets. The permanent magnet ring (101) and the first permanent magnet strip (511) generate a repulsive force. Under the action of the repulsive force, the first permanent magnet strip (511) slides into the transfer groove (512). The material opening of the transfer groove (512) is opened. The first permanent magnet strip (511) and the second permanent magnet strip (7) generate a mutual attractive force. Under the action of the attractive force of the second permanent magnet strip (7), the first permanent magnet strip (511) slides towards the material opening of the transfer groove (512).

2. The filtration machine for processing PD plastic products according to claim 1, characterized in that, A push rod (207) is movably installed at the bottom end of the annular groove (202). The bottom end of the push rod (207) passes through the lower cylinder cover (2). The outer side of the push rod (207) is provided with an external thread. The bottom end of the lower cylinder cover (2) is provided with a rotatable threaded push ring (206). The inner side of the threaded push ring (206) is provided with an internal thread that matches the external thread of the push rod (207). A guide port (203) is provided on the lower cylinder cover (2) between the inner bushing (6) and the filter element (4). An impurity ring hole (204) communicating with the bottom end of the annular groove (202) is provided on the inner side of the lower cylinder cover (2). A discharge pipe (205) communicating with the impurity ring hole (204) is fixedly installed on one side of the bottom end of the lower cylinder cover (2).

3. A filtration machine for processing PD plastic products according to claim 2, characterized in that, The thickness of the push rod (207) is less than the thickness of the inner bushing (6).

4. A filtration machine for processing PD plastic products according to claim 2, characterized in that, The edge of the slider (503) close to one end of the inner bushing (6) is set as an inclined surface.

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