A melt filter

Abstract

The present invention discloses a melt filter, comprising a shell, a cylindrical filter element, a shielding cover and a feed pipe, wherein a discharge port is provided at the top of the shell, the discharge port is communicated with the shell cavity of the shell, the cylindrical filter element is inserted into the shell cavity from the top of the shell, the shielding cover is slidably arranged at the bottom of the shell, a shielding groove and a drainage channel are provided on the shielding cover, the shielding groove is aligned with the filter screen of the cylindrical filter element and can accommodate the filter screen, one end of the drainage channel is communicated with the interior of the cylindrical filter element, and the other end of the drainage channel is selectively communicated with the feed pipe; when the shielding cover is inserted into the shell cavity, the drainage channel is disconnected from the feed pipe, and the filter screen is inserted into the shielding groove. When the cylindrical filter element of the melt filter is replaced, no melt will remain inside the cylindrical filter element when it is taken out, thereby avoiding waste.

Description

Technical Field

[0001] The invention relates to the technical field of filters, and in particular to a melt filter. Background Art

[0002] Melt filter is a kind of filter used in the process of molten material processing. It can continuously filter large particles or other impurities in the melt through the filter element to obtain fine and pure molten material, so as to make the quality of the subsequent condensation of the melt to make the product more reliable.

[0003] Melt filters are widely used in the fields of high-speed spinning and fine-denier spinning, and play a significant role in extending the life of spinning components, improving equipment utilization and increasing production. However, the current melt filters have the following problems when used:

[0004] 1. When the current melt filter is used for a long time, a large amount of impurities will accumulate on the filter element, and too many impurities will cause the filter element to be blocked, affecting the filtering efficiency. Therefore, the filter element of the melt filter needs to be replaced, cleaned and maintained regularly. However, when the existing melt filter is cleaned and maintained, it is necessary to shut down the machine, remove the filter element and replace it. This process is time-consuming and laborious;

[0005] 2. The cylindrical filter element used in the current melt filter will retain a portion of the melt inside the cylindrical filter element when the filter element is replaced, which will cause a large amount of melt waste when the filter element is cleaned. Summary of the invention

[0006] In view of the above problems, the present invention proposes a melt filter to overcome the above problems or at least partially solve the above problems.

[0007] A melt filter comprises a shell, a cylindrical filter element, a shielding cover and a feed pipe, wherein a discharge port is provided on the top of the shell, and the discharge port is communicated with the shell cavity of the shell, the cylindrical filter element is inserted into the shell cavity from the top of the shell, the shielding cover is slidably arranged on the bottom of the shell, a shielding groove and a drainage channel are provided on the shielding cover, the shielding groove is aligned with the filter screen of the cylindrical filter element and can accommodate the filter screen, one end of the drainage channel is communicated with the interior of the cylindrical filter element, and the other end of the drainage channel is selectively communicated with the feed pipe; when the shielding cover is inserted into the shell cavity, the drainage channel is disconnected from the feed pipe, and the filter screen is inserted into the shielding groove.

[0008] Preferably, a valve core sleeve and a valve core spring are provided on the shielding cover, the feed pipe extends into the shielding cover and a ejector pin is provided on the top; the valve core sleeve is slidably sleeved on the shielding cover, and the valve core spring is located between the valve core sleeve and the shielding cover; when the shielding cover is inserted into the shell cavity, the valve core spring can push the valve core sleeve to move to block the drainage channel; when the shielding cover is moved out of the shell cavity, the ejector pin can push the valve core sleeve to overcome the valve core spring and move to open the drainage channel.

[0009] Preferably, a positioning pin and a positioning spring are provided at the top of the cylindrical filter element, and a positioning groove is provided at the top of the shell; after the cylindrical filter element is inserted into the shell cavity, the positioning spring can push the positioning pin into the positioning groove.

[0010] Preferably, the melt filter is provided with a plurality of the cylindrical filter elements and a plurality of the shielding covers, and each of the cylindrical filter elements corresponds to one shielding cover.

[0011] Preferably, the melt filter is provided with a push rod; the push rod is located below the shielding cover and can push the shielding cover to be inserted into the shell cavity.

[0012] Preferably, the melt filter is provided with a base, the push rod is arranged on the base, and the feed pipe is rotatably arranged on the base; the feed pipe can drive the shell to rotate, and rotate the plurality of shielding covers to above the push rod in sequence.

[0013] Preferably, the shell is provided with a piston hole, a flow channel and a one-way valve, and the shielding cover is provided with a piston rod; the number of the piston holes is the same as the number of the cylindrical filter elements, and the piston hole is arranged on the side corresponding to the cylindrical filter element in the vertical direction, the flow channel is an annular flow channel and connects the upper ends of all the piston holes, a one-way valve is provided at the flow channel between two adjacent piston holes, and the opening directions of all the one-way valves are consistent, the number of the piston rods is the same as the number of the piston holes, and the upper end of the piston rod is located in the piston hole; the piston rod moves synchronously with the shielding cover, and when the shielding cover enters the shell cavity, the corresponding piston rod enters the corresponding piston hole, and the control fluid in the piston hole is pushed into the flow channel and enters the other piston hole through the one-way valve to push the piston rod in the other piston hole to withdraw, so as to withdraw from the shell cavity with the corresponding shielding cover.

[0014] Preferably, a sliding frame is provided on the base, and a ratchet is provided on the feed pipe; a pawl connected by a torsion spring is provided on the sliding frame, and the sliding frame reciprocates in a horizontal direction relative to the base, and can drive the pawl to drive the ratchet to rotate unidirectionally.

[0015] Preferably, the ratchet is a square ratchet, and a first elastic sheet and a second elastic sheet are provided on the base; the first elastic sheet and the second elastic sheet are respectively located on two sides of the ratchet to limit the one-way rotation of the ratchet.

[0016] Preferably, a connecting rod is provided at the protruding end of the push rod, a sliding rod along the horizontal direction is provided on the base, one end of the sliding frame is slidably mounted on the sliding rod, and a sliding spring is provided between the sliding frame and the base; the connecting rod is hinged to the push rod, and the free end of the connecting rod can move along the sliding rod to push the sliding frame to overcome the sliding spring and move; in the process of the push rod extending to push the shielding cover to insert into the shell cavity, the push rod drives the connecting rod to break away from contact with the sliding frame, and in the process of the push rod being fully retracted, the connecting rod pushes the sliding frame to move along the sliding rod, so as to drive the pawl to push the ratchet to overcome the action force of the first spring sheet and the second spring sheet to rotate.

[0017] The melt filter of the present invention has the following beneficial technical effects:

[0018] 1. In the present invention, by arranging a shielding cover at the bottom of the shell, and arranging a shielding groove and a drainage channel selectively connected to the feed pipe on the shielding cover, when the cylindrical filter element needs to be replaced, the shielding cover can be inserted into the shell cavity, the drainage channel can be cut off, and the filter screen of the cylindrical filter element can be entered into the shielding groove, so that the melt inside the cylindrical filter element can be squeezed out, so that no melt will remain inside the cylindrical filter element when it is taken out, thereby avoiding waste.

[0019] 2. In the present invention, by arranging a plurality of cylindrical filter elements and corresponding shielding covers on the shell, a plurality of workstations can be formed to improve the filtering efficiency of the melt, and in the process of replacing the cylindrical filter elements of some workstations, the normal operation of the cylindrical filter elements of other workstations will not be affected, thereby realizing online replacement and maintenance, and further improving the working effect of the melt filter.

[0020] 3. In the present invention, by arranging a piston rod on the shielding cover, arranging a piston hole on the shell and providing a flow channel with a one-way valve, the shielding cover can be automatically withdrawn from the shell cavity after the replacement of the cylindrical filter element during the shielding operation before the shielding cover is controlled to remove the cylindrical filter element to be replaced, so that the replaced cylindrical filter element enters the filtering working state, and the automation of replacing the cylindrical filter element is further improved while maintaining the filtering effect of the melt filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the cross-sectional structure of the melt filter of this embodiment;

[0022] Figure 2 for Figure 1Schematic diagram of the cross-sectional structure along the AA direction;

[0023] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure along the BB direction;

[0024] Figure 4 for Figure 1 Schematic diagram of the cross-sectional structure along the CC direction;

[0025] Figure 5 for Figure 1 Schematic diagram of the cross-sectional structure along the DD direction;

[0026] Figure 6 for Figure 1 Schematic diagram of the cross-sectional structure along the EE direction;

[0027] Figure 7 is a schematic cross-sectional structure diagram of the shielding cover in this embodiment;

[0028] Figure 8 Schematic diagram of the cross-sectional structure of the cylindrical filter element in this embodiment;

[0029] Fig. 9 Schematic diagram of the cross-sectional structure of the feed pipe in this embodiment. DETAILED DESCRIPTION

[0030] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0031] Combination Figures 1 to 9 As shown, the melt filter of this embodiment includes a housing 1, a cylindrical filter element 2, a shielding cover 3 and a feed pipe 4. Among them, the housing 1 is placed in a vertical direction, and a discharge port 5 is provided at the top of the housing 1, and the discharge port 5 is connected to the housing cavity 6 inside the housing 1. The cylindrical filter element 2 is inserted into the housing cavity 6 from the top of the housing 1 in a vertical direction. The shielding cover 3 is slidably arranged at the bottom of the housing 1 in a vertical direction. A shielding groove 7 and a drainage channel 8 are provided on the shielding cover 3. The shielding groove 7 is aligned with the filter screen 9 of the cylindrical filter element 2 in a vertical direction and can accommodate the filter screen 9. The drainage channel 8 is located at the top of the shielding cover 3. The upper end of the drainage channel 8 is connected to the inside of the cylindrical filter element 2 inserted into the housing cavity 6, and the lower end of the drainage channel 8 is selectively connected to the feed pipe 4. When the shielding cover 3 is inserted into the housing cavity 6, the drainage channel 8 is disconnected from the feed pipe 4, and the filter screen 9 is inserted into the shielding groove 7. When the shielding cover 3 is moved out of the shell cavity 6 , the drainage channel 8 is connected with the feed pipe 4 , and the filter screen 9 is separated from the shielding groove 7 .

[0032] In this embodiment, a shielding cover is provided at the bottom of the shell, and a shielding groove and a drainage channel selectively connected to the feed pipe are provided on the shielding cover. When the cylindrical filter element needs to be replaced, the shielding cover can be inserted into the shell cavity to cut off the drainage channel and allow the filter screen of the cylindrical filter element to enter the shielding groove, thereby squeezing out the melt inside the cylindrical filter element and preventing the melt from remaining inside when the cylindrical filter element is taken out, thereby avoiding waste.

[0033] Combination Figure 1 , Figure 2 , Figure 7 and Fig. 9 As shown, in the melt filter of this embodiment, the shielding cover 3 is provided with a valve core sleeve 10 and a valve core spring 11, the feed pipe 4 extends into the shielding cover 3 and a ejector pin 12 is provided on the top. The valve core sleeve 10 is slidably sleeved on the shielding cover 3 in the vertical direction, and the valve core spring 11 is located between the valve core sleeve 10 and the shielding cover 3. When the shielding cover 3 is inserted into the housing cavity 6, as shown in FIG. Figure 2 As shown in the right shielding cover 3, the valve core spring 11 can push the valve core sleeve 10 to move to the side of the lower end of the drainage channel 8, thereby blocking the drainage channel 8. When the shielding cover 3 is moved out of the housing cavity 6, as shown in FIG. Figure 1 In the position of the shielding cover 3 shown, the ejector pin 12 can push the valve core sleeve 10 to overcome the valve core spring 11 and move upward to above the lower end of the drainage channel 8, thereby opening the drainage channel 8.

[0034] In this embodiment, by extending the feed pipe into the shielding cover and arranging a pin at the top of the feed pipe, and arranging a valve core sleeve and a valve core spring at the drainage channel of the shielding cover, the on-off relationship between the feed pipe and the inside of the cylindrical filter element can be automatically controlled during the process of the shielding cover entering and exiting the shell cavity. That is, when the shielding cover enters the shell cavity to shield the cylindrical filter element, the drainage channel is disconnected, and the introduction of melt into the cylindrical filter element is cut off to stop filtering. Conversely, when the shielding cover moves out of the shell cavity to release the shielding of the cylindrical filter element, the drainage channel is connected, and the introduction of melt into the cylindrical filter element for filtering is started, thereby realizing the automation of melt introduction control during the disassembly, assembly and replacement of the cylindrical filter element, thereby improving the convenience of operation.

[0035] Combination Figures 1 to 3 and Figure 8 As shown, in the melt filter of this embodiment, a positioning pin 13 and a positioning spring 14 are provided at the top of the cylindrical filter element 2, and a positioning groove 15 is provided at the top of the housing 1 where the cylindrical filter element 2 is inserted. After the cylindrical filter element 2 is inserted into the housing cavity 6, the positioning pin 13 is aligned with the positioning groove 15 in the horizontal direction, and the positioning spring 14 can push the positioning pin 13 into the positioning groove 15, thereby fixing the position of the cylindrical filter element 2.

[0036] In this embodiment, by setting positioning pins and positioning grooves between the cylindrical filter element and the housing, the positioning pins and positioning grooves can be used to fix the position of the cylindrical filter element after the installation of the cylindrical filter element is completed, thereby ensuring the position stability of the cylindrical filter element during subsequent work and ensuring the filtering effect.

[0037] Combination Figures 1 to 5 As shown, in the melt filter of this embodiment, four cylindrical filter elements 2 and four shielding covers 3 corresponding to the four cylindrical filter elements 2 are provided. The four cylindrical filter elements 2 are evenly arranged on the housing 1 along the circumferential direction, thereby forming four working positions, namely the first station G1, the second station G2, the third station G3 and the fourth station G4.

[0038] At this time, by arranging multiple cylindrical filter elements and corresponding shielding covers on the shell, multiple filtering stations can be formed to improve the filtering efficiency of the melt, and in the process of replacing the cylindrical filter elements of some stations, the normal filtering work of the cylindrical filter elements of other stations will not be affected, thereby realizing online replacement and maintenance, and further improving the working effect of the melt filter.

[0039] Combination Figure 1 , Figure 3 and Fig. 9 As shown, the feed pipe 4 is also provided with four outlets to be connected to the four shielding covers 3 respectively, so as to introduce the melt to be filtered into the four cylindrical filter elements 2 respectively. Of course, in other embodiments, the number of cylindrical filter elements can be adjusted to meet different usage requirements.

[0040] Combination Figure 1 As shown, in the melt filter of this embodiment, a push rod 16 is further provided. The push rod 16 is electrically driven and is arranged below the shielding cover 3, and can push the shielding cover 3 to move upward and insert into the housing cavity 6. At this time, by controlling the extension and contraction of the push rod, the shielding cover can be pushed into the housing cavity to shield the cylindrical filter element that needs to be replaced, thereby achieving the effect of automatic control.

[0041] Combination Figure 1 As shown, in the melt filter of this embodiment, a base 17 is further provided, the base 17 is located below the housing 1, the push rod 16 is arranged on the base 17, and the feed pipe 4 is rotatably arranged on the base 17. The feed pipe 4 can rotate relative to the base 17, so that the entire housing 1 is rotated through the shielding cover 3, and the four shielding covers 3 and the corresponding cylindrical filter elements 2 are moved to the top of the push rod 16, so as to realize the disassembly, assembly and replacement of the cylindrical filter element 2.

[0042] Combination Figures 1 to 5 and Figure 7As shown, in the melt filter of this embodiment, the housing 1 is provided with a piston hole 18, a flow channel 19 and a one-way valve 20, and the shielding cover 3 is provided with a piston rod 21. The number of the piston holes 18 is the same as the number of the cylindrical filter element 2, which is four, and the four piston holes 18 are evenly distributed along the circumferential direction of the housing 1 and are respectively arranged on the outer side of the corresponding cylindrical filter element 2 along the vertical direction. The flow channel 19 is an annular flow channel and connects the upper ends of the four piston holes 18, and a one-way valve 20 is provided at the flow channel 19 between two adjacent piston holes 18, and the opening directions of the four one-way valves 20 are consistent, so that the control liquid in the flow channel 19 flows along the inner side of the housing 1. Figure 4 The flow is counterclockwise as shown. The number of piston rods 21 is the same as the number of piston holes 18, which is four. The upper end of each piston rod 21 is located in the corresponding piston hole 18. The piston rod 21 and the corresponding shielding cover 3 can move synchronously. When the shielding cover 3 enters the shell cavity 6, the corresponding piston rod 21 enters the corresponding piston hole 18, and the control fluid in the piston hole 18 is pushed into the flow channel 19 and enters another piston hole 18 through the one-way valve 20, thereby pushing the piston rod 21 in the other piston hole 18 to withdraw, and then withdraw from the shell cavity 6 with the corresponding shielding cover 3.

[0043] In this embodiment, by setting a piston rod on the shielding cover, setting a piston hole on the shell and providing a flow channel with a one-way valve, the shielding cover can be automatically withdrawn from the shell cavity after the replacement of the cylindrical filter element during the shielding operation before the shielding cover is controlled to remove the cylindrical filter element to be replaced, so that the replaced cylindrical filter element enters the filtering working state, thereby further improving the automation of the melt filter.

[0044] Combination Figure 1 and Figure 6 As shown, in the melt filter of this embodiment, a sliding frame 22 is further provided on the base 17, and a ratchet 23 is provided on the feed pipe 4. A ratchet 25 connected by a torsion spring 24 is provided on the sliding frame 22, and the sliding frame 22 can reciprocate relative to the base 17 in the horizontal direction, and can drive the ratchet 25 to drive the ratchet 23 to rotate in one direction.

[0045] At this time, when the cylindrical filter element on the shell needs to be replaced, by controlling the sliding frame to move relative to the base, the ratchet can be driven to rotate with the help of the pawl to transfer the cylindrical filter element to be replaced to the top of the push rod, thereby completing the covering of the cylindrical filter element, and then continuing to drive the feed pipe to rotate through the sliding frame to complete the disassembly, assembly and replacement of the cylindrical filter element.

[0046] Combination Figure 6 As shown, in the melt filter of this embodiment, the ratchet 23 is a square ratchet, and a first spring piece 26 and a second spring piece 27 are provided on the base 17. The first spring piece 26 and the second spring piece 27 are respectively located on both sides of the ratchet 23 to limit the ratchet 23 from rotating in one direction.

[0047] At this time, the sliding frame moves with the pawl to Figure 8 When the ratchet wheel moves in the left direction as shown, it can drive the ratchet wheel to overcome the first elastic piece and the second elastic piece to rotate counterclockwise. When the ratchet wheel passes the dead point, the ratchet wheel can accurately complete a 90-degree rotation under the action of the restoring force of the first elastic piece and the second elastic piece, so that the cylindrical filter elements of the four stations complete a transfer to adjacent positions. After that, the sliding frame carries the ratchet pawl to Figure 8 When moving in the right direction as shown, the pawl overcomes the torsion spring to rotate, and can pass over the ratchet wheel to keep the ratchet wheel in a non-rotating state.

[0048] Combination Figure 1 and Figure 6 As shown, in the melt filter of this embodiment, a connecting rod 28 is provided at the extended end of the push rod 16, and a sliding rod 29 is also provided on the base 17 along the horizontal direction. One end of the sliding frame 22 is slidably sleeved on the sliding rod 29, and a sliding spring 30 is provided between the sliding frame 22 and the base 17. The connecting rod 28 is hinged to the extended end of the push rod 16, and the free end of the connecting rod 28 can move along the sliding rod 29 to push the sliding frame 22 to overcome the sliding spring 30. In the process of the push rod 16 extending upward to push the shielding cover 3 into the shell cavity 6, the push rod 16 drives the connecting rod 28 to break away from the contact with the sliding frame 22. In the process of the push rod 16 being completely retracted downward, it can drive the connecting rod 28 along the sliding rod 29 to push the sliding frame 22 to move. Figure 1 The ratchet 23 moves in the left direction as shown, so as to drive the pawl 25 to push the ratchet 23 to rotate by overcoming the action of the first elastic sheet 26 and the second elastic sheet 27 .

[0049] In this embodiment, by providing a rotatably connected connecting rod at the extended end of the push rod, the sliding frame can be accurately controlled to move horizontally relative to the shell during the process of the push rod controlling the shielding cover to move back and forth, thereby simultaneously realizing the rotation control of the feed pipe, further improving the automation control of the melt filter.

[0050] In addition, combined Figure 1 , Figure 2 and Fig. 9 As shown, in the present embodiment, the feed pipe 4 adopts a forked structure, and the horizontal part can be used to assist in positioning the shielding cover 3 that is separated from the shell cavity 6, so that the top of the shielding cover 3 remains connected to the cylindrical filter element 2, ensuring that the melt in the feed pipe 4 can smoothly enter the cylindrical filter element 2 for filtration. At the same time, sealing members are respectively provided between the shielding cover 3, the cylindrical filter element 2, the shell 1 and the feed pipe 4 to improve the sealing of the relative connection and form a certain friction resistance so that the shielding cover 3 inserted into the shell cavity 6 can be maintained in the shell cavity 6.

[0051] Combination Figures 1 to 9As shown, the working process of the melt filter in this embodiment is as follows:

[0052] When the melt filter of this embodiment is needed for melt filtration, the melt to be filtered is led to the feed pipe 4 and enters the inner flow channel 31 in the feed pipe 4. At this time, the shielding hoods 3 located at the first station G1, the second station G2 and the third station G3 are outside the shell 1. The ejector pins 12 at the top of the corresponding feed pipes 4 of these three stations push the valve core sleeve 10 in the corresponding shielding hood 3 upward to overcome the valve core spring 11 and keep the drainage channel 8 open, so that the melt to be filtered enters the cylindrical filter element 2 of these three stations for filtration, and the melt after filtration through the filter screen 9 enters the shell cavity 6 and is discharged through the discharge port 5, thereby completing the filtering operation of the melt. The shielding hood 3 of the fourth station G4 is in the shell cavity 6, so that the cylindrical filter element 2 of this station is in a blocked state and melt filtration is not performed temporarily.

[0053] When the melt filter of this embodiment performs long-term filtering work and the cylindrical filter element 2 needs to be replaced and maintained, the push rod 16 is controlled to extend to push the shielding cover 3 located above the push rod 16 to move into the shell cavity 6, that is, to push the shielding cover 3 at the third station G3 into the shell cavity 6, and at the same time drive the piston rod 21 connected to the shielding cover 3 to enter the corresponding piston hole 18. During this process, on the one hand, the shielding cover 3 at the third station G3 enters the shell cavity 6, causing the valve core sleeve 10 on the shielding cover 3 to move upward and disengage from the abutment with the ejector pin 12, and the valve core sleeve 10 is pushed downward by the valve core spring 11 to block the drainage channel 8 on the shielding cover 3, stopping the introduction of melt into the cylindrical filter element 2 at the third station G3, and the shielding cover 3 entering the cylindrical filter element 2 squeezes out the melt in the cylindrical filter element 2 until the shielding cover 3 moves to the top; on the other hand, when the piston rod 21 at the third station G3 enters the piston hole 18, the control liquid in the piston hole 18 is pushed into the flow channel 19, and passes through the one-way valve 20 between the third station G3 and the fourth station G4 along Figure 4 The counterclockwise flow channel shown in FIG. 1 controls the liquid to enter the piston hole 18 corresponding to the fourth station G4, that is, Figure 4 The piston hole 18 at the lowermost position shown in the figure pushes the piston rod 21 corresponding to the fourth station G4 to move downward, thereby driving the shielding cover 3 of the fourth station G4 to move out of the shell cavity 6, so that the filter screen of the cylindrical filter element 2 of the fourth station G4 leaks out, and the shielding covers 3 at the first station G1 and the second station G2 remain in the position state of extending out of the shell cavity 6. When the shielding cover 3 at the fourth station G4 moves downward to the corresponding ejector pin 12 to push the valve core sleeve 10 on its top upward to overcome the valve core spring 11 to open the drainage channel 8, the melt in the feed pipe 4 can enter the cylindrical filter element 2, thereby making the cylindrical filter element 2 at the fourth station G4 enter the filtering state, and the cylindrical filter element 2 at the third station G3 stops filtering.

[0054] When the control push rod 16 is retracted and the connecting rod 28 is driven to descend until it contacts the slide rod 29, the connecting rod 28 pushes the slide frame 22 to overcome the slide spring 30 and move to the Figure 6 The sliding frame 22 drives the ratchet 25 to move to the left side. Figure 6 The ratchet 23 moves in the left direction as shown in the figure, and the ratchet 23 is driven to rotate by overcoming the force of the first spring piece 26 and the second spring piece 27. When the ratchet 23 passes the dead point, the ratchet 23 completes a 90-degree rotation under the restoring force of the first spring piece 26 and the second spring piece 27, so that the feed pipe 4 rotates 90 degrees with the shell 1. Figure 3 The cylindrical filter element 2 at the third station G3 is transferred to the fourth station G4, and then the top positioning pin 13 of the cylindrical filter element 2 is driven to overcome the positioning spring 14 and be pulled out from the positioning groove 15. The cylindrical filter element 2 can be pulled out and a new cylindrical filter element 2 can be reinserted to complete the replacement of the cylindrical filter element 2.

[0055] The push rod 16 is controlled to extend so that the extended end of the push rod 16 is rotated to Figure 3 The bottom of the shielding cover 3 of the third station G3 is in contact, that is, Figure 1 At the same time, the extended end of the push rod 16 drives the connecting rod 28 to move upward to release the push on the sliding frame 22, so that the sliding frame 22 moves to the right side under the restoring force of the sliding spring 30. Figure 6 As shown in the right direction, the ratchet 25 overcomes the torsion spring 24 and rotates to pass the ratchet 23, thus completing the reset of the push rod 16 and the sliding frame 22. Repeating the above process, other cylindrical filter elements 2 can be replaced in turn, realizing the online replacement and maintenance of the melt filter during filtration.

Claims

1. A melt filter, characterized in that: It comprises a shell, a cylindrical filter element, a shielding cover and a feed pipe, the top of the shell is provided with a discharge port, the discharge port is communicated with the shell cavity of the shell, the cylindrical filter element is inserted into the shell cavity from the top of the shell, the shielding cover is slidably arranged at the bottom of the shell, a shielding groove and a drainage channel are provided on the shielding cover, the shielding groove is aligned with the filter screen of the cylindrical filter element and can accommodate the filter screen, one end of the drainage channel is communicated with the interior of the cylindrical filter element, and the other end of the drainage channel is selectively communicated with the feed pipe; when the shielding cover is inserted into the shell cavity, the drainage channel is disconnected from the feed pipe, and the filter screen is inserted into the shielding groove; The shielding cover is provided with a valve core sleeve and a valve core spring, the feed pipe extends into the shielding cover and a ejector is provided on the top; the valve core sleeve is slidably sleeved on the shielding cover, and the valve core spring is located between the valve core sleeve and the shielding cover; when the shielding cover is inserted into the housing cavity, the valve core spring can push the valve core sleeve to move to block the drainage channel; when the shielding cover is moved out of the housing cavity, the ejector can push the valve core sleeve to overcome the valve core spring and move to open the drainage channel; The melt filter is provided with a plurality of the cylindrical filter elements and a plurality of the shielding covers, and each of the cylindrical filter elements corresponds to one shielding cover.

2. The melt filter according to claim 1, characterized in that A positioning pin and a positioning spring are provided on the top of the cylindrical filter element, and a positioning groove is provided on the top of the shell; after the cylindrical filter element is inserted into the shell cavity, the positioning spring can push the positioning pin to extend into the positioning groove.

3. The melt filter according to claim 1, characterized in that The melt filter is provided with a push rod; the push rod is located below the shielding cover and can push the shielding cover to be inserted into the housing cavity.

4. The melt filter according to claim 3, characterized in that The melt filter is provided with a base, the push rod is arranged on the base, and the feed pipe is rotatably arranged on the base; the feed pipe can drive the shell to rotate, and rotate the plurality of shielding covers to the top of the push rod in sequence.

5. The melt filter according to claim 4, characterized in that The shell is provided with a piston hole, a flow channel and a one-way valve, and the shielding cover is provided with a piston rod; the number of the piston holes is the same as the number of the cylindrical filter elements, and the piston holes are arranged on the side corresponding to the cylindrical filter element in the vertical direction, the flow channel is an annular flow channel and connects the upper ends of all the piston holes, a one-way valve is provided at the flow channel between two adjacent piston holes, and the opening directions of all the one-way valves are consistent, the number of the piston rods is the same as the number of the piston holes, and the upper end of the piston rod is located in the piston hole; the piston rod moves synchronously with the shielding cover, and when the shielding cover enters the shell cavity, the corresponding piston rod enters the corresponding piston hole, and the control fluid in the piston hole is pushed into the flow channel and enters the other piston hole through the one-way valve to push the piston rod in the other piston hole to withdraw, so as to withdraw from the shell cavity with the corresponding shielding cover.

6. The melt filter according to claim 5, characterized in that The base is provided with a sliding frame, and the feed pipe is provided with a ratchet; the sliding frame is provided with a pawl connected by a torsion spring, and the sliding frame reciprocates relative to the base in a horizontal direction, and can drive the pawl to drive the ratchet to rotate unidirectionally.

7. The melt filter according to claim 6, characterized in that The ratchet is a square ratchet, and a first spring sheet and a second spring sheet are provided on the base; the first spring sheet and the second spring sheet are respectively located on two sides of the ratchet to limit the ratchet to rotate in one direction.

8. The melt filter according to claim 7, characterized in that The protruding end of the push rod is provided with a connecting rod, and the base is provided with a sliding rod along the horizontal direction. One end of the sliding frame is slidably mounted on the sliding rod, and a sliding spring is provided between the sliding frame and the base; the connecting rod is hinged to the push rod, and the free end of the connecting rod can move along the sliding rod to push the sliding frame to overcome the sliding spring and move; in the process of the push rod extending to push the shielding cover to insert into the shell cavity, the push rod drives the connecting rod to break away from contact with the sliding frame, and in the process of the push rod being fully recovered, the connecting rod pushes the sliding frame to move along the sliding rod, so as to drive the pawl to push the ratchet to overcome the action force of the first spring sheet and the second spring sheet to rotate.

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