Plate-type closed filter

Abstract

The application discloses a plate type closed filter, and relates to the field of filters, which comprises a tank body provided with a liquid inlet, a liquid outlet and a filter cavity, the liquid inlet is connected with the filter cavity, the liquid outlet is located on the outer wall of the tank body, the liquid outlet penetrates through the tank body to the filter cavity, the cavity wall of the filter cavity is provided with a flow collecting pipe which is connected with the liquid outlet; the tank body is provided with a vibrator and a vibrating rod, the vibrating rod is located in the filter cavity, the vibrating rod is provided with a plate type filter screen, the plate type filter screen is provided with a filter flow channel which is connected with the flow collecting pipe, and the vibrator drives the vibrating rod to vibrate; the vibrator and the vibrating rod are arranged, gas is introduced into the filter cavity to dry filter cake after the operation of the filtrate is completed, then the vibrator is started, the vibrator drives the vibrating rod to vibrate and makes the plate type filter screen arranged on the vibrating rod vibrate together, and the filter cake on the plate type filter screen is removed, so that the operation of removing the filter cake is more convenient.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of filter machines, more particularly, it relates to a plate type closed filter machine. BACKGROUND

[0002] The plate type closed filter machine is a kind of precise clarification filter equipment with effective energy saving and closed operation, which is suitable for solid-liquid separation or clarification filtration in industries such as salad oil, crude oil, petroleum, resin, food, pharmaceutical, polyether and environmental water treatment.

[0003] As disclosed in Chinese patent CN104147828A, a plate type filter machine includes a dirty oil input port, an air pressure gauge, an air inlet, a filter layer, a cylinder, a support frame, a clean oil outlet, a backflow pipeline, a filter aid inlet and an air pressure valve. The filter aid inlet is arranged at the top of the cylinder, the filter layer is arranged in the cylinder, the air pressure valve is arranged on the backflow pipeline, the air inlet is arranged on the cylinder above the filter layer, and the air inlet is connected with a compression box and a blower. Since the plate type filter machine adds filter aid to the filter layer, the filter layer and the filter aid are integrated, which has the advantages of high filtration precision, compact structure, small size, reliable operation and convenient maintenance.

[0004] However, after the filtration operation, a layer of filter cake is accumulated on the plate type filter screen inside the filter machine, and the filter cake needs to be removed by opening the cylinder and disassembling the plate type filter screen, which is inconvenient for cleaning and needs to be improved. SUMMARY

[0005] In order to improve the problem of inconvenient cleaning of the plate type filter screen, the present application provides a plate type closed filter machine.

[0006] The plate type closed filter machine provided by the present application adopts the following technical solution:

[0007] The plate type closed filter machine includes a cylinder, which is provided with a liquid inlet, a liquid outlet and a filter cavity. The liquid inlet is connected to the filter cavity, the liquid outlet is located on the outer wall of the cylinder, the liquid outlet penetrates the cylinder to the filter cavity, and the cavity wall of the filter cavity is provided with a flow collecting pipe which is connected to the liquid outlet. The cylinder is provided with a vibrator and a vibration rod, the vibration rod is located in the filter cavity, the vibration rod is provided with a plate type filter screen, the plate type filter screen is provided with a filter flow channel, the filter flow channel is connected to the flow collecting pipe, and the vibrator drives the vibration rod to vibrate.

[0008] Through the above technical solution, the vibrator and the vibration rod are arranged. After the filtration operation is completed, gas is introduced into the filter cavity for drying the filter cake. Then the vibrator is started, the vibrator drives the vibration rod to vibrate and the plate type filter screen arranged on the vibration rod also vibrates, and the filter cake on the plate type filter screen is removed, so that the operation of removing the filter cake is more convenient.

[0009] Further, the tank body outer wall is provided with a liquid outlet pipe, the liquid outlet pipe is provided with a liquid outlet channel, the liquid outlet channel is communicated with a liquid outlet port, and the liquid outlet channel is provided with a filter screen one.

[0010] Through the above technical scheme, in actual use, since the filtrate effect is affected by the filter cake thickness, there is a situation that the filter cake thickness is insufficient and causes the liquid with high impurity content to be discharged from the liquid outlet port, so the filter screen one is arranged for re-filtering, and the filtering effect is improved.

[0011] Further, the filter screen one slides in the liquid outlet channel, the sliding direction of the filter screen one is the through direction of the liquid outlet channel, the liquid outlet channel is provided with a limiting plate, the limiting plate is located at one end of the filter screen one away from the liquid outlet port, the limiting plate is provided with a return spring, the return spring is connected with the filter screen one, and the elastic force of the return spring limits the movement of the filter screen one in the direction close to the limiting plate; the liquid outlet pipe is provided with a mounting cavity, the cavity wall of the mounting cavity is provided with a sliding hole one and a display hole one, the sliding hole one is communicated between the liquid outlet channel and the mounting cavity, the cavity wall of the mounting cavity is provided with a sliding spring one, the sliding spring one is connected with a sliding block one, one end of the sliding block one away from the sliding spring one penetrates through the sliding hole one and protrudes from the inner wall of the liquid outlet channel, and the sliding block one is used for abutting against the filter screen one; the sliding block one is connected with a sliding rod one, and one end of the sliding rod one away from the sliding block one is located in the display hole one; when the filter screen one moves and pushes the sliding block one to move, the sliding block one drives the sliding rod one to move and makes one end of the sliding rod one away from the sliding block one protrude from the outer wall of the liquid outlet pipe.

[0012] Through the above technical scheme, in actual use, when a certain amount of impurities is not attached to the surface of the filter screen one, the impact of the liquid makes the filter screen one move in the direction close to the limiting plate, and at this time, the filter screen one abuts against the sliding block one; when a certain amount of impurities is attached to the surface of the filter screen one, due to the impact of the liquid, the moving distance of the filter screen one at this time is greater than the moving distance of the filter screen one when the filter screen one is impacted without impurities, the filter screen one pushes the sliding block one to move and makes the sliding rod one protrude from the outer wall of the liquid outlet pipe, and this facilitates prompting the staff to stop infusion and replace the filter screen one in time.

[0013] Further, the liquid outlet channel side wall is provided with two positioning plates and filter screens, the positioning plate is located on the side of the limiting plate away from the filter screen one, the positioning plate is provided with a positioning spring, the elastic force of the positioning spring limits the movement of the filter screen two away from the filter screen one; the installation cavity wall is provided with a sliding hole two and a display hole two, the sliding hole two is connected with the liquid outlet channel and the installation cavity, the installation cavity wall is provided with a sliding spring two, the sliding spring two is connected with a sliding block two, the filter screen two abuts against the sliding block two, one end of the sliding block two away from the sliding spring two is flush with the liquid outlet channel side wall, the sliding block two is connected with a sliding rod two, one end of the sliding rod two away from the sliding block two penetrates through the sliding hole two and protrudes from the liquid outlet pipe side wall; when the filter screen two moves, the filter screen two separates from the sliding block two, the elastic force of the sliding spring two makes the sliding block two protrude from the liquid outlet channel side wall, the sliding block two drives the sliding rod two to move and makes one end of the sliding rod two away from the sliding block two located in the sliding hole two.

[0014] Through the above technical scheme, in actual use, the filter screen one has the following two moving conditions, the first is the movement of the filter screen one caused by the liquid passing through the filter screen one and impacting the filter screen one, at this time, the filter screen two moves due to the liquid impact, and the sliding rod two is located in the sliding hole two; the second is the movement of the filter screen one due to the attachment of a certain amount of impurities on the surface of the filter screen one, under this condition, the liquid flow through the filter screen two is reduced, the filter screen two still abuts against the sliding block two, and the sliding rod two protrudes from the outer wall of the liquid outlet pipe, the staff judges whether the filter screen one needs to be cleaned in sequence, so that the overall use is more stable.

[0015] The liquid outlet pipe is a square tube, the liquid outlet pipe is also provided with a guide cavity, the guide cavity is provided with a magnetic part one, the installation cavity is provided with a magnetic part two, the magnetic part two is located above the magnetic part one, the liquid outlet channel is provided with a guide rod, the length direction of the guide rod is the connecting line of the magnetic part one and the magnetic part two, the guide rod is slidably provided with a magnetic part three, the magnetic part three is attracted to the magnetic part two, and the magnetic part three is attracted to the magnetic part one; the installation cavity is provided with a connecting piece one and a connecting piece two, the connecting piece one connects the sliding block one and the magnetic part two, and the connecting piece two connects the sliding block two and the magnetic part two; when the filter screen one abuts against the sliding block one and the filter screen two abuts against the sliding block two, the connecting piece one and the connecting piece two make the magnetic part two move away from the magnetic part three.

[0016] Through the above technical scheme, by such a way, the magnetic part three is arranged, when the filter screen two does not move and the filter screen one moves a limited distance, the magnetic part two separates from the magnetic part three, so that the magnetic part three moves towards the magnetic part one, and the filter screen one is scraped, the attachment of impurities is reduced, the effect of temporary cleaning is achieved, and the overall use is more convenient.

[0017] Further, the inner wall of the liquid outlet channel is provided with a position accommodating groove, the position accommodating groove is located on the side close to the magnetic part one of the magnetic part three, one end of the guide rod is located in the position accommodating groove, and the depth of the position accommodating groove is greater than the thickness of the magnetic part three.

[0018] Through the above technical scheme, in actual use, when the filter screen one has certain impurities, the magnetic part three scrapes off the impurities, and the thickness of the magnetic part three and the thickness of the impurities after scraping off affect the normal use of the filter screen one, therefore, the position accommodating groove is arranged, and the thickness of the position accommodating groove is greater than the thickness of the magnetic part three, so that the impurities and the magnetic part three are placed.

[0019] Further, the tank body is provided with a discharge port, the discharge port is located at the lower end of the tank body, the discharge port is connected with the filter cavity, the discharge port is provided with a closing part, and the closing part closes the discharge port.

[0020] Through the above technical scheme, the discharge port and the closing part are arranged, so that the filter cake shaken off after vibration of the vibration rod can be discharged, the impurity powder can be collected, and the whole use is more convenient.

[0021] Further, the filter cavity is provided with a guide surface, and the guide surface is gradually expanded in the direction close to the vibration rod.

[0022] Through the above technical scheme, the guide surface is arranged, the guide surface is gradually expanded in the direction close to the vibration rod, the guide surface is convenient for collecting the impurity powder, the situation that the impurity powder is left in the filter cavity is reduced, and the whole use is more convenient.

[0023] In summary, the present application has at least one of the following beneficial technical effects:

[0024] (1) By arranging the vibrator and the vibration rod, starting the vibrator, the vibrator drives the vibration rod to vibrate and makes the plate filter screen one arranged on the vibration rod vibrate, and the filter cake on the plate filter screen is removed, so that the operation of removing the filter cake is more convenient;

[0025] (2) By arranging the filter screen one for re-filtering, the filtering effect is improved;

[0026] (3) By arranging the filter screen two, when a certain amount of impurities is attached to the surface of the filter screen one, the liquid flow through the filter screen two is reduced due to the movement caused by the impact of the liquid, the filter screen two still abuts against the sliding block two, the sliding rod two protrudes from the outer wall of the liquid outlet pipe, and the staff sequentially judges whether the filter screen one needs to be cleaned, so that the whole use is more stable. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a whole schematic view of the embodiment.

[0028] Figure 2A cross-sectional view of an embodiment.

[0029] Figure 3 A Figure 2 An enlarged view of the middle A.

[0030] Figure 4 A partial view of an embodiment.

[0031] Reference numerals: 1, tank body; 2, filter tank; 3, cover plate; 4, liquid inlet; 5, liquid outlet; 6, vibrator; 7, vibration rod; 8, plate filter screen; 9, air pressure balance port; 10, discharge port; 11, closure; 12, liquid outlet pipe; 13, limiting plate; 14, positioning plate; 15, return spring; 16, positioning spring; 17, filter screen one; 18, filter screen two; 19, mounting cavity; 20, sliding hole one; 21, display hole one; 22, sliding spring one; 23, sliding block one; 24, inclined surface one; 25, sliding rod one; 26, sliding hole two; 27, display hole two; 28, sliding spring two; 29, sliding block two; 30, inclined surface two; 31, sliding rod two; 32, guide cavity; 33, magnetic element one; 34, magnetic element two; 35, magnetic element three; 36, guide rod; 37, accommodation groove; 38, connecting element one; 39, connecting element two; 40, connecting rod; 41, connecting spring; 42, filter cavity; 43, liquid outlet channel; 44, manifold; 45, filter flow channel. DETAILED DESCRIPTION

[0032] The application will be further described in detail below with reference to the accompanying drawings.

[0033] The embodiment of the application discloses a plate type closed filter.

[0034] Embodiment:

[0035] Reference Figure 1 and Figure 2 A plate type closed filter, comprising a tank body 1, the tank body 1 comprising a filter tank 2 and a cover plate 3, the filter tank 2 being provided with a filter groove, and the cover plate 3 covering the filter groove to form a filter cavity 42. The tank body 1 is provided with a liquid inlet 4 and a liquid outlet 5, the liquid inlet 4 being connected to the filter cavity 42, and the liquid outlet 5 being located on the outer wall of the tank body 1 and penetrating through the tank body 1 to the filter cavity 42, and the cavity wall of the filter cavity 42 being provided with a manifold 44, and the manifold 44 being connected to the liquid outlet 5. The tank body 1 is provided with a vibrator 6 and a vibration rod 7, the vibration rod 7 being located in the filter cavity 42, the vibration rod 7 being provided with a plate filter screen 8, the plate filter screen 8 being provided with a filter flow channel 45, the filter flow channel 45 being connected to the manifold 44, and the vibrator 6 driving the vibration rod 7 to vibrate.

[0036] The tank body 1 is provided with an air pressure balance port 9 and a discharge port 10. The air pressure balance port 9 is located on the side wall of the tank body 1 and penetrates the tube body to the filter cavity 42. The discharge port 10 is located at the lower end of the tank body 1 and is connected to the filter cavity 42. The discharge port 10 is provided with a closure member 11 for closing the discharge port 10. In actual use, the closure member 11 is a motor and a rotating plate. The side wall of the rotating plate abuts against the inner wall of the discharge port 10, and the motor drives the rotating plate to rotate. Alternatively, the closure member 11 can also be a closing plate, which is manually opened when discharging is needed. The filter cavity 42 is provided with a guide surface at the bottom, which is gradually expanded in the direction close to the vibration rod 7.

[0037] Referring to Figure 2 and Figure 3 , the outer wall of the tank body 1 is provided with a liquid outlet pipe 12, which is a square tube. The liquid outlet pipe 12 is provided with a liquid outlet channel 43, which communicates with the liquid outlet 5. The liquid filtered by the plate filter screen 8 passes through the filter flow channel 45 and flows out from the liquid outlet flow channel of the liquid outlet pipe 12. The inner wall of the liquid outlet channel 43 is provided with a limiting plate 13 and a positioning plate 14. The positioning plate 14 is located on the side of the limiting plate 13 away from the liquid outlet 5. The limiting plate 13 is connected with a return spring 15, which is located at the end of the limiting plate 13 away from the positioning plate 14. The return spring 15 is connected with a first filter screen 17, and the outer wall of the first filter screen 17 abuts against the inner wall of the liquid outlet channel 43. The first filter screen 17 slides in the inner wall of the liquid outlet channel 43, and the sliding direction of the first filter screen 17 is the extension direction of the liquid outlet channel 43. The elastic force of the return spring 15 limits the movement of the first filter screen 17 towards the limiting plate 13.

[0038] The positioning plate 14 is provided with a positioning spring 16, which is located at the end of the positioning plate 14 close to the limiting plate 13. The end of the positioning spring 16 away from the positioning plate 14 is connected with a second filter screen 18, which is located between the positioning plate 14 and the limiting plate 13. The outer wall of the second filter screen 18 abuts against the inner wall of the liquid outlet channel 43. The second filter screen 18 slides in the inner wall of the liquid outlet channel 43, and the sliding direction of the second filter screen 18 is the extension direction of the liquid outlet channel 43. The elastic force of the positioning spring 16 limits the movement of the second filter screen 18 towards the positioning plate 14.

[0039] The liquid outlet pipe 12 is provided with a mounting cavity 19 located above the filter screen 17. The cavity wall of the mounting cavity 19 is provided with a sliding hole 1 and a display hole 1. The sliding hole 1 is connected with the liquid outlet channel 43 and the mounting cavity 19. The display hole 1 is connected with the mounting cavity 19 and the outside. The cavity wall of the mounting cavity 19 is provided with a sliding spring 1. The sliding spring 1 is connected with a sliding block 1. The end of the sliding block 1 away from the sliding spring 1 penetrates through the sliding hole 1 and protrudes from the inner wall of the liquid outlet channel 43. The elastic force of the sliding spring 1 limits the movement of the sliding block 1 away from the axis of the liquid outlet channel 43. The sliding block 1 is located between the filter screen 1 and the limiting plate 13. The sliding block 1 is in contact with the filter screen 1. The sliding block 1 is provided with an inclined surface 1. The inclined surface 1 is located at the end of the sliding block 1 away from the sliding spring 1 and the end of the sliding block 1 away from the limiting plate 13. The inclined surface 1 extends towards the limiting plate 13 from the end of the sliding block 1 away from the sliding spring 1. The sliding block 1 is connected with a sliding rod 1. The sliding rod 1 is located at the end of the sliding block 1 provided with the sliding spring 1. The end of the sliding rod 1 away from the sliding block 1 is located in the display hole 1.

[0040] When the filter screen 1 moves towards the limiting plate 13 and pushes the sliding block 1 to move, the sliding block 1 drives the sliding rod 1 to move and the end of the sliding rod 1 away from the sliding block 1 protrudes from the outer wall of the manifold 44.

[0041] The cavity wall of the mounting cavity 19 is provided with a sliding hole 2 and a display hole 2. The sliding hole 2 is connected with the liquid outlet channel 43 and the mounting cavity 19. The display hole 2 is connected with the mounting cavity 19 and the outside. The cavity wall of the mounting cavity 19 is provided with a sliding spring 2. The sliding spring 2 is connected with a sliding block 2. The sliding block 2 penetrates through the sliding hole 2. The sliding block 2 is in contact with the filter screen 2. When the filter screen 2 contacts the end of the sliding block 2 away from the sliding spring 2, the end of the sliding block 2 away from the sliding spring 2 is flush with the side wall of the liquid outlet channel 43. The sliding block 2 is provided with an inclined surface 2. The inclined surface 2 is located at the end of the sliding block 2 away from the sliding spring 2 and the end of the sliding block 2 away from the sliding block 1. The inclined surface 2 extends towards the sliding block 1 from the end of the sliding block 2 away from the sliding spring 2. The sliding block 2 is connected with a sliding rod 2. The end of the sliding rod 2 away from the sliding block 2 penetrates through the display hole 2 and protrudes from the side wall of the liquid outlet pipe 12. When the filter screen 2 moves and separates from the sliding block 2, the elastic force of the sliding spring 2 makes the sliding block 2 protrude from the side wall of the liquid outlet channel 43. The sliding block 2 drives the sliding rod 2 to move and the end of the sliding rod 2 away from the sliding block 2 is located in the sliding hole 2.

[0042] Referring to Figure 3 and Figure 4 The outlet pipe 12 is provided with a guide cavity 32 located on the side of the outlet pipe 12 away from the mounting cavity 19, and the guide cavity 32 is provided with a magnetic piece one 33. The mounting cavity 19 is provided with a magnetic piece two 34 located directly above the magnetic piece one 33, and the magnetic piece two 34 slides on the cavity wall of the mounting cavity 19, and the sliding direction of the magnetic piece two 34 is the vertical direction. The outlet channel 43 is provided with a guide rod 36, the length direction of the guide rod 36 is the connecting line of the magnetic piece one 33 and the magnetic piece two 34, and the guide rod 36 slides with a magnetic piece three 35, and the sliding direction of the magnetic piece three 35 is the length direction of the guide rod 36. The magnetic piece three 35 attracts the magnetic piece two 34, and the magnetic piece three 35 and the magnetic piece one 33 attract each other. The inner wall of the outlet channel 43 is provided with a clearance groove 37 located on the side of the magnetic piece three 35 close to the magnetic piece one 33, and one end of the guide rod 36 is located in the clearance groove 37, and the depth of the clearance groove 37 is greater than the thickness of the magnetic piece three 35.

[0043] The mounting cavity 19 is provided with a connecting piece one 38 and a connecting piece two 39, the connecting piece one 38 is used to connect the sliding block one 23 and the magnetic piece two 34, and the connecting piece two 39 is used to connect the sliding block two 29 and the magnetic piece two 34. In actual use, the connecting piece one 38 is a connecting rod 40 and a connecting spring 41, the connecting rod 40 is located above the magnetic piece two 34, the connecting rod 40 connects the sliding rod one 25, one end of the connecting spring 41 connects the magnetic piece two 34, and the other end of the connecting spring 41 connects the connecting rod 40, and the elastic force of the connecting spring 41 limits the connecting rod 40 to extend away from the magnetic piece two 34. The connecting piece one 38 and the connecting piece two 39 are consistent in structure. Alternatively, the connecting piece one 38 can be only the connecting rod 40, the connecting piece one 38 connects one end of the magnetic piece two 34 close to the sliding block one 23, and the connecting piece two 39 connects one end of the magnetic piece two 34 away from the sliding block two 29. When the filter screen one 17 moves to abut against the sliding block one 23, and the filter screen two 18 does not move to abut against the sliding block two 29, the connecting piece one 38 and the connecting piece two 39 make the magnetic piece two 34 move away from the magnetic piece three 35.

[0044] In actual use, the magnetic piece three 35 is an iron product, and the magnetic piece one 33 and the magnetic piece two 34 are magnets. Alternatively, the magnetic piece three 35 is a magnet, and the magnetic piece one 33 and the magnetic piece two 34 are iron products.

[0045] The working principle of the embodiment is as follows:

[0046] In actual use, when the filtering operation is performed, the main filtering is performed by the plate filter screen 8, and the auxiliary filtering is performed by the filter screen 1 7. When a certain amount of impurities is attached to the surface of the filter screen 1 7, the impurities are moved and push the sliding block 1 3 to move due to the impact of the liquid, in this case, the liquid flow through the filter screen 2 1 8 is reduced, and the filter screen 2 1 8 still contacts the sliding block 2 9. The connecting piece 1 38 and the connecting piece 2 39 pull the magnetic piece 2 34 to move, so that the magnetic piece 3 5 cleans the filter screen 1 7.

[0047] When the filtering operation is finished, the gas is introduced into the filtering cavity 42 to dry the filter cake, and then the vibrator 6 is started, the vibrator 6 drives the vibration rod 7 to vibrate, and the plate filter screen 8 arranged on the vibration rod 7 also vibrates, and the filter cake on the plate filter screen 8 is removed.

[0048] The above are the preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, therefore: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A plate-type closed filter comprising a tank (1), characterized in that: The tank body (1) is provided with a liquid inlet (4), a liquid outlet (5) and a filter cavity (42), the liquid inlet (4) is connected with the filter cavity (42), the liquid outlet (5) is located on the outer wall of the tank body (1), the liquid outlet (5) penetrates the tank body (1) to the filter cavity (42), and the cavity wall of the filter cavity (42) is provided with a manifold (44), and the manifold (44) is communicated with the liquid outlet (5); The tank body (1) is provided with a vibrator (6) and a vibrating rod (7), the vibrating rod (7) is located in the filter cavity (42), the vibrating rod (7) is provided with a plate filter screen (8), the plate filter screen (8) is provided with a filter flow channel (45), the filter flow channel (45) is communicated with the manifold (44), and after the liquid passes through the mesh opening of the plate filter screen (8), the liquid enters the filter flow channel (45) and flows to the manifold (44); the vibrator (6) drives the vibrating rod (7) to vibrate; The outer wall of the tank body (1) is provided with a liquid outlet pipe (12), the liquid outlet pipe (12) is provided with a liquid outlet channel (43), the liquid outlet channel (43) is communicated with the liquid outlet (5), and the liquid outlet channel (43) is provided with a filter screen one (17); The filter screen one (17) slides in the liquid outlet channel (43), the sliding direction of the filter screen one (17) is the penetration direction of the liquid outlet channel (43), the liquid outlet channel (43) is provided with a limiting plate (13), the limiting plate (13) is located at one end of the filter screen one (17) away from the liquid outlet (5), the limiting plate (13) is provided with a reset spring (15), the reset spring (15) is connected with the filter screen one (17), and the elastic force of the reset spring (15) limits the movement of the filter screen one (17) towards the limiting plate (13); The liquid outlet pipe (12) is provided with a mounting cavity (19), the cavity wall of the mounting cavity (19) is provided with a sliding hole one (20) and a display hole one (21), the sliding hole one (20) is communicated with the liquid outlet channel (43) and the mounting cavity (19), the cavity wall of the mounting cavity (19) is provided with a sliding spring one (22), the sliding spring one (22) is connected with a sliding block one (23), one end of the sliding block one (23) away from the sliding spring one (22) penetrates the sliding hole one (20) and protrudes from the inner wall of the liquid outlet channel (43), the sliding block one (23) is abutted by the filter screen one (17), the sliding block one (23) is connected with a sliding rod one (25), and one end of the sliding rod one (25) away from the sliding block one (23) is located in the display hole one (21); When the filter screen one (17) moves and pushes the sliding block one (23) to move, the sliding block one (23) drives the sliding rod one (25) to move and makes one end of the sliding rod one (25) away from the sliding block one (23) protrude from the outer wall of the liquid outlet pipe (12); The side wall of the liquid outlet channel (43) is provided with a positioning plate (14) and a filter screen two (18), the positioning plate (14) is located on the side of the limiting plate (13) away from the filter screen one (17), the positioning plate (14) is provided with a positioning spring (16), the elastic force of the positioning spring (16) limits the movement of the filter screen two (18) away from the filter screen one (17); The cavity wall of the mounting cavity (19) is provided with a sliding hole two (26) and a display hole two (27), the sliding hole two (26) is communicated with the liquid outlet channel (43) and the mounting cavity (19), the cavity wall of the mounting cavity (19) is provided with a sliding spring two (28), the sliding spring two (28) is connected with a sliding block two (29), the filter screen two (18) abuts against the sliding block two (29), one end of the sliding block two (29) away from the sliding spring two (28) is flush with the side wall of the liquid outlet channel (43), the sliding block two (29) is connected with a sliding rod two (31), one end of the sliding rod two (31) away from the sliding block two (29) penetrates through the display hole two (27) and protrudes from the side wall of the liquid outlet pipe (12); When the filter screen two (18) moves, the filter screen two (18) is separated from the sliding block two (29), the elastic force of the sliding spring two (28) makes the sliding block two (29) protrude from the side wall of the liquid outlet channel (43), the sliding block two (29) drives the sliding rod two (31) to move and makes one end of the sliding rod two (31) away from the sliding block two (29) located in the sliding hole two (26); The liquid outlet pipe (12) is a square tube, the liquid outlet pipe (12) is also provided with a guide cavity (32), the guide cavity (32) is provided with a magnetic part one (33), the mounting cavity (19) is provided with a magnetic part two (34), the magnetic part two (34) is located above the magnetic part one (33), the liquid outlet channel (43) is provided with a guide rod (36), the length direction of the guide rod (36) is the connecting line of the magnetic part one (33) and the magnetic part two (34), the guide rod (36) is slidably provided with a magnetic part three (35), the magnetic part three (35) is attracted to the magnetic part two (34), the magnetic part three (35) and the magnetic part one (33) are attracted to each other; The mounting cavity (19) is provided with a connecting piece one (38) and a connecting piece two (39), the connecting piece one (38) connects the sliding block one (23) and the magnetic part two (34), the connecting piece two (39) connects the sliding block two (29) and the magnetic part two (34); when the filter screen one (17) abuts against the sliding block one (23) and the filter screen two (18) abuts against the sliding block two (29), the connecting piece one (38) and the connecting piece two (39) make the magnetic part two (34) move away from the magnetic part three (35).

2. A plate and frame filter press according to claim 1, characterised in that: The inner wall of the liquid outlet channel (43) is provided with a let go slot (37), the let go slot (37) is located on the side of the magnetic part three (35) close to the magnetic part one (33), one end of the guide rod (36) is located in the let go slot (37), the depth of the let go slot (37) is greater than the thickness of the magnetic part three (35).

3. A plate and frame filter press according to claim 1, characterized in that: The tank body (1) is provided with a discharge port (10) located at the lower end of the tank body (1), the discharge port (10) is connected with a filter cavity (42), and the discharge port (10) is provided with a closure (11) for closing the discharge port (10).

4. A plate and frame filter press according to claim 3, characterised in that: The filter cavity (42) is provided with a guide surface which is divergent in the direction close to the vibration rod (7).

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