Hydraulic filter press and use method thereof

Abstract

The invention discloses a hydraulic pressure filter press and a use method thereof, relates to the technical field of solid-liquid separation, and aims to solve the problems that a filter block sometimes cannot automatically fall down through gravity and the filter pressing efficiency is influenced because a material is pressed against the interior of a filter pressing chamber after being subjected to filter pressing in the prior art. An inclined flow guide bottom plate is arranged on the lower end face of the filter press box body, a filter pressing box is movably connected to the position, at the upper end of the inclined flow guide bottom plate, in the filter press box body, and a rectangular opening is formed in one side of the filter pressing box; the side, away from the rectangular opening, of the front end face and the rear end face of the filter pressing box is connected with the side, adjacent to the trapezoidal flow guide cavity, of the interior of the filter press box body through second hydraulic rods, a filter pressing plate is arranged on the side, away from the rectangular opening, of the interior of the filter pressing box, and during discharging, the second hydraulic rods are used for driving the whole filter pressing box to move; and active material pushing and unloading are realized by matching with the static filter pressing plate, so that the problem that a filter cake is easy to block in a traditional gravity unloading mode is thoroughly solved.

Description

Technical Field

[0001] The present invention relates to the technical field of solid-liquid separation, in particular to a hydraulic filter press and a method for using the same. Background Art

[0002] As a highly efficient solid-liquid separation device, filter presses play an irreplaceable role in numerous industrial sectors. In the petrochemical industry, filter presses are widely used in key processes such as catalyst recovery, lubricant dewaxing, and petroleum residue treatment. In the oil and oleochemical industry, they are relied upon for decolorization, degumming, and dewaxing in the vegetable oil refining process. The specialty chemicals and fine chemical industries utilize filter presses for precision filtration of high-purity chemicals, ensuring that product particle size distribution and purity meet stringent standards. In the food industry, filter presses are used in processes such as juice clarification, beer filtration, edible oil refining, and syrup purification to ensure food safety and quality. The pharmaceutical industry relies even more on their aseptic operation characteristics for GMP-compliant production processes such as filtration of antibiotic fermentation broths and purification of APIs. In the polymer industry, filter presses are not only used to separate catalysts in polymerization reactions, but also for dehydration and purification of synthetic materials such as resins and fibers.

[0003] For example, the authorization announcement number CN117771765B, a stable and efficient chamber filter press and its use method, belongs to the field of filter press technology, including a filter frame group, a chamber filter press box group arranged on the left side of the top surface of the filter frame group, a plurality of sliding rods laterally connected between the right side of the chamber filter press box group and the right side of the filter frame group, a main telescopic device laterally arranged in the middle of the right side of the filter frame group, and a movable push plate frame group arranged on the left side of the main telescopic device. Through the structural combination design of the chamber filter press box group, each sliding rod, the main telescopic device, the movable push plate frame group, the secondary filter pressing mechanism, the sealing extrusion plate group, the filter plate assembly and the high-pressure air intake plate on the filter frame group, a chamber filter press with two extrusion and filtration at different speeds is constituted. The initial filtration and squeezing process will be relatively fast, which will improve the efficiency, while the secondary filtration process needs to be relatively slowed down to the conventional filtration speed process. During the secondary filtration, high-pressure gas is added at the upper end to assist in the extrusion and filtration, so that the filtration efficiency is higher.

[0004] In the above technology, the filter block is automatically unloaded by falling automatically by gravity. However, after the material is filtered, it will be pressed tightly inside the filter press chamber, resulting in the filter block sometimes being unable to automatically fall by gravity. Manual unloading is required, which affects the filtration efficiency. Therefore, the market urgently needs to develop a hydraulic filter press to help people solve the existing problems. Summary of the Invention

[0005] The object of the present invention is to provide a hydraulic filter press to solve the problem that the prior art proposed in the above background technology uses the method of automatic unloading of filter blocks by automatic falling of filter blocks by gravity, but the material will be pressed tightly inside the filter press chamber after filtration, resulting in the filter blocks sometimes being unable to fall automatically by gravity and requiring manual unloading, which affects the filtration efficiency.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a hydraulic filter press, comprising a filter press casing, the lower end surface of the filter press casing being provided with an oblique guide bottom plate, a trapezoidal guide cavity being provided at the lower end inside the filter press casing on one side of the oblique guide bottom plate, a filter press box being movably connected inside the filter press casing and at the upper end of the oblique guide bottom plate, a rectangular opening being provided on one side of the filter press box, the front and rear end surfaces of the filter press box and the end surface of the side adjacent to the interior of the filter press casing and the trapezoidal guide cavity on the side away from the rectangular opening are connected by a second hydraulic rod, a filter press plate is provided inside the filter press box and on the side away from the rectangular opening, a drop opening is provided at the upper end of the lower end surface of the oblique guide bottom plate, and the lower end of the drop opening is rotatably connected to a rectangular door panel.

[0007] Preferably, a sealing ring is provided between one end face of the rectangular opening of the filter press box and the inner side end face of the filter press box body, the sealing ring is fixedly connected to the filter press box, a feed port is provided in the middle of the upper end face of the filter press box, and a drain port is provided at the lower end of the trapezoidal guide cavity.

[0008] Preferably, the front and rear end surfaces of the filter press box are fixedly connected to fixed blocks on the side away from the rectangular opening, the telescopic ends of the two second hydraulic rods are respectively fixedly connected to one side of the two fixed blocks, and the other ends of the two second hydraulic rods are connected to the inside of the filter press box and between the end faces of one side adjacent to the trapezoidal guide cavity.

[0009] Preferably, guide support rods are fixedly connected to the upper and lower ends of the front and rear ends between the two side end surfaces inside the filter press box, and guide parts are fixedly connected to the upper and lower ends of the two side front and rear end surfaces of the filter press box. A guide through hole is provided in the middle of each guide part, and the four guide support rods respectively pass through the guide through holes of multiple guide parts on the front and rear end surfaces of the filter press box.

[0010] Preferably, the filter press box is fixedly connected to a limiting tube in the middle of the end face on one side away from the rectangular opening, and the filter press plate is fixedly connected to a connecting rod in the middle of the side adjacent to the limiting tube. One end of the connecting rod passes through the limiting tube and extends to the inside of the filter press case. A first hydraulic rod is fixedly connected to the end face on one side of the filter press case, and the telescopic end of the first hydraulic rod extends to the inside of the filter press case and is fixedly connected to one end of the connecting rod.

[0011] Preferably, the filter press box is fixedly connected to the front and rear ends of the middle part of the end face on one side away from the rectangular opening with a guide tube, and the filter press plate is fixedly connected to the front and rear ends of the middle part of the side adjacent to the guide tube with a guide rod, and the two guide rods respectively pass through the middle of the two guide tubes and extend to the inside of the filter press box.

[0012] Preferably, the upper end of the rectangular door panel and the lower end surface of the oblique flow guide bottom plate are rotatably connected via a first rotating shaft.

[0013] Preferably, an L-shaped support plate is fixedly connected to the lower end of the end face of one side of the filter press housing adjacent to the blanking port, and a rotating seat is fixedly connected to the lower middle end of the inner end face of the L-shaped support plate, and the rotating seat is connected to the middle part of the lower end face of the rectangular door panel through a third hydraulic rod.

[0014] Preferably, the lower end of the third hydraulic rod is fixedly connected to a first rotating connection member, the upper end of the telescopic end of the third hydraulic rod is fixedly connected to a second rotating connection member, the first rotating connection member is rotationally connected to the rotating seat through a second rotating shaft, and the second rotating connection member is rotationally connected to the middle part of the lower end surface of the rectangular door panel through a third rotating shaft.

[0015] A method of use comprises the following steps:

[0016] Step 1: In the initial state, the two second hydraulic rods respectively push the two fixed blocks to move to one side, so that the two fixed blocks synchronously drive the filter press box to move to one side, thereby making the rectangular opening of the filter press box fit tightly with the end surface of one side inside the filter press box body and seal it through a sealing ring. The filter press box is supported inside the filter press box body by multiple guide members and four guide support rods. At the same time, when the filter press box moves, the guide through holes on the guide members move along the guide support rods for guidance;

[0017] Step 2: After the rectangular opening of the filter press box is sealed with the end face of one side of the inner part of the filter press housing, the material is added into the filter press box from the feed port, and the filter press plate is pushed by the first hydraulic rod through the connecting rod, so that the filter press plate pushes the material to move toward the side of the rectangular opening to filter the material. The filtered liquid seeps out through the front and rear end faces and the lower end face of the filter press box and falls onto the inclined guide bottom plate, and is guided to the trapezoidal guide cavity through the inclined guide bottom plate and discharged from the drain port. When the filter press plate moves, it simultaneously drives the two guide rods to slide along the guide tube to guide the movement of the filter press plate;

[0018] Step 3: After the material filtration is completed, the filter press plate is kept stationary, and the two fixed blocks are pulled by the two second hydraulic rods respectively, so that the two fixed blocks synchronously drive the filter press box to move, so that the rectangular opening of the filter press box is separated from the end surface of one side of the interior of the filter press box. When the filter press box moves, since the filter press plate remains stationary, the filter cake after filtration is pushed out from the rectangular opening by the filter press plate when the filter press box moves, thereby realizing filter cake discharge. By controlling the moving distance of the filter press box, the filter press plate is moved to the rectangular opening to prevent the filter press plate from separating from the interior of the filter press box. By designing the length of the guide rod, the guide rod will not separate from the interior of the guide tube after the filter press box moves.

[0019] Step 4: Before the second hydraulic rod drives the rectangular opening of the filter press box to separate from one end surface of the interior of the filter press box, the third hydraulic rod drives the rectangular door panel to deflect downward through the first rotating shaft, so that the drop opening is fully opened. After leaving the rectangular opening, the material automatically falls down through the drop opening by gravity and is discharged from the interior of the filter press box;

[0020] Step 5: After the filter cake is discharged from the discharge port, the third hydraulic rod drives the rectangular door panel to reset, and the two second hydraulic rods synchronously drive the rectangular opening of the filter press box to re-fit and press the end surface of one side inside the filter press box, and then the first hydraulic rod drives the filter press plate to reset, and the next filtration operation can be carried out.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) In this invention, an innovative hydraulically driven unloading mechanism is designed, in which the second hydraulic rod is used to drive the entire filter press box to move, and the stationary filter press plate is used to realize active pushing and unloading, thus completely solving the problem of filter cake being easily stuck in the traditional gravity unloading method.

[0023] (2) In this invention, a multi-level hydraulic coordinated control system is adopted. The first hydraulic rod controls the filter press plate, the second hydraulic rod controls the displacement of the filter press box, and the third hydraulic rod controls the discharge door. The fully automated operation of the "filter pressing-discharging-resetting" process is realized.

[0024] (3) In this invention, the innovatively designed guide support system (guide support rod + guide member + guide tube + guide rod combination) realizes the dual precise guidance of the filter press box translation and the filter press plate advancement, and independently guides the movement of the filter press box and the filter press plate, so that the filter press box and the filter press plate remain stable during movement, and at the same time, the filter press plate remains in a vertical state, effectively ensuring the uniformity of the filtration quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a front view of a hydraulic filter press and a method of using the same according to the present invention;

[0026] Figure 2 It is a main cross-sectional view of the present invention;

[0027] Figure 3 It is a side sectional view of the filter press box of the present invention;

[0028] Figure 4 A top cross-sectional view of the filter press plate of the present invention;

[0029] Figure 5 It is an enlarged view of detail A of the present invention.

[0030] In the figure: 1. filter press casing; 101. oblique flow guide bottom plate; 102. drop-out port; 103. trapezoidal flow guide cavity; 104. drain port; 105. guide support rod; 106. first hydraulic rod; 107. second hydraulic rod; 2. filter press box; 201. rectangular opening; 202. sealing ring; 203. feed port; 204. limit tube; 205. guide tube; 206. guide member; 207. guide through hole; 208. fixed block; 3. filter press plate; 301. connecting rod; 302. guide rod; 4. rectangular door panel; 401. first rotating shaft; 5. L-shaped support plate; 501. rotating seat; 6. third hydraulic rod; 601. first rotating connecting member; 602. second rotating shaft; 603. second rotating connecting member; 604. third rotating shaft. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] See also Figure 1-5, an embodiment provided by the present invention: a hydraulic filter press, comprising a filter press housing 1, a lower end surface of the filter press housing 1 is provided with an oblique flow guide bottom plate 101, a trapezoidal flow guide cavity 103 is provided at the lower end of the interior of the filter press housing 1 on one side of the oblique flow guide bottom plate 101, a drain port 104 is provided at the lower end of the trapezoidal flow guide cavity 103, a filter press box 2 is movably connected to the upper end of the oblique flow guide bottom plate 101 inside the filter press housing 1, a rectangular opening 201 is provided on one side of the filter press box 2, and an end surface of one side of the rectangular opening 201 of the filter press box 2 is connected to the filter press housing 1 A sealing ring 202 is provided between the inner side end faces, and the sealing ring 202 is fixedly connected to the filter press box 2. The front and rear end faces of the filter press box 2 and the side away from the rectangular opening 201 are connected to the inner side of the filter press box 1 and the side face adjacent to the trapezoidal guide cavity 103 through a second hydraulic rod 107. The front and rear end faces of the filter press box 2 and the side away from the rectangular opening 201 are fixedly connected to a fixed block 208. The telescopic ends of the two second hydraulic rods 107 are fixedly connected to one side of the two fixed blocks 208 respectively, and the other ends of the two second hydraulic rods 107 are fixedly connected to the other side of the two fixed blocks 208. The two second hydraulic rods 107 are used to push the two fixed blocks 208 to move to one side, so that the two fixed blocks 208 can synchronously drive the filter press box 2 to move to one side, thereby making the rectangular opening 201 of the filter press box 2 fit tightly with the end face of one side of the filter press box 1 and seal it through the sealing ring 202. The upper and lower ends of the front and rear ends between the two end faces of the filter press box 1 are fixedly connected with the guide support rods 105. The two sides of the front and rear end faces of the filter press box 2 are fixedly connected. Guide members 206 are fixedly connected to both ends, and a guide through hole 207 is provided in the middle of each guide member 206. The four guide support rods 105 respectively pass through the guide through holes 207 of multiple guide members 206 on the front and rear end surfaces of the filter press box 2. The filter press box 2 is supported inside the filter press machine body 1 by multiple guide members 206 and four guide support rods 105. At the same time, when the filter press box 2 moves, the guide through holes 207 on the guide members 206 move along the guide support rods 105 for guidance, thereby ensuring the stability of the lateral movement of the filter press box 2.

[0033] See also Figure 2 and Figure 3, a filter press plate 3 is provided inside the filter press box 2 and on the side away from the rectangular opening 201, a feed port 203 is provided in the middle of the upper end surface of the filter press box 2, and the material is added to the filter press box 2 through the feed port 203, and the middle of the end surface of the side of the filter press box 2 away from the rectangular opening 201 is fixedly connected to the limiting tube 204, and the middle of the side of the filter press plate 3 adjacent to the limiting tube 204 is fixedly connected to the connecting rod 301, one end of the connecting rod 301 passes through the limiting tube 204 and extends to the inside of the filter press case 1, and the end surface of one side of the filter press case 1 is fixedly connected It is connected to a first hydraulic rod 106, the telescopic end of the first hydraulic rod 106 extends to the inside of the filter press case 1 and is fixedly connected to one end of the connecting rod 301. The first hydraulic rod 106 pushes the filter press plate 3 through the connecting rod 301, so that the filter press plate 3 pushes the material to move to one side of the rectangular opening 201 to filter the material. The filtered liquid seeps out through the front and rear end surfaces and the lower end surface of the filter press box 2 and falls onto the oblique guide bottom plate 101, and is guided to the trapezoidal guide cavity 103 through the oblique guide bottom plate 101 and discharged from the drain port 104.

[0034] See also Figure 3 and Figure 4 The front and rear ends of the middle part of the end face of the side of the filter press box 2 away from the rectangular opening 201 are fixedly connected with a guide tube 205, and the front and rear ends of the middle part of the side of the filter press plate 3 adjacent to the guide tube 205 are fixedly connected with a guide rod 302. The two guide rods 302 respectively pass through the middle of the two guide tubes 205 and extend into the inside of the filter press box 1. When the filter press plate 3 moves, the two guide rods 302 are synchronously driven to slide along the guide tubes 205 to guide the movement of the filter press plate 3 and ensure the stability of the movement of the filter press plate 3.

[0035] See also Figure 2 and Figure 5, the upper end of the lower end surface of the oblique flow guide bottom plate 101 is provided with a blanking port 102, and the lower end of the blanking port 102 is rotatably connected to the rectangular door panel 4, and the upper end of the rectangular door panel 4 is rotatably connected to the lower end surface of the oblique flow guide bottom plate 101 through a first rotating shaft 401, and the lower end of the end surface of the filter press housing 1 adjacent to the blanking port 102 is fixedly connected with an L-shaped support plate 5, and the lower end of the middle part of the inner end surface of the L-shaped support plate 5 is fixedly connected with a rotating seat 501, and the rotating seat 501 is connected to the middle part of the lower end surface of the rectangular door panel 4 through a third hydraulic rod 6, and the lower end of the third hydraulic rod 6 is fixedly connected to the first rotating connection member 601, and the upper end of the telescopic end of the third hydraulic rod 6 is fixedly connected to the second rotating connection member 603, and the first rotating connection member 601 is rotatably connected to the rotating seat 501 through the second rotating shaft 602, and the second rotating connection member 603 is connected to the middle part of the lower end surface of the rectangular door panel 4 through the third hydraulic rod 6. The three rotating shafts 604 are rotatably connected. When the material filtration is completed, the filter press plate 3 is kept stationary, and the two fixed blocks 208 are pulled respectively by the two second hydraulic rods 107, so that the two fixed blocks 208 synchronously drive the filter press box 2 to move, so that the rectangular opening 201 of the filter press box 2 is separated from the end face of one side inside the filter press case 1. When the filter press box 2 moves, since the filter press plate 3 remains stationary, the filter cake after filtration is pushed out from the rectangular opening 201 by the filter press plate 3 when the filter press case 1 moves, thereby realizing filter cake discharge. Before the second hydraulic rod 107 drives the rectangular opening 201 of the filter press box 2 to separate from the end face of one side inside the filter press case 1, the third hydraulic rod 6 drives the rectangular door panel 4 to deflect downward through the first rotating shaft 401, so that the blanking port 102 is fully opened. After leaving the rectangular opening 201, it automatically falls down by gravity and is discharged from the inside of the filter press case 1 through the blanking port 102.

[0036] A method of use comprises the following steps:

[0037] Step 1: In the initial state, the two second hydraulic rods 107 respectively push the two fixed blocks 208 to move to one side, so that the two fixed blocks 208 synchronously drive the filter press box 2 to move to one side, thereby making the rectangular opening 201 of the filter press box 2 fit tightly with the end surface of one side inside the filter press housing 1 and seal it through the sealing ring 202. The filter press box 2 is supported inside the filter press housing 1 by multiple guide members 206 and four guide support rods 105. At the same time, when the filter press box 2 moves, the guide through holes 207 on the guide members 206 move along the guide support rods 105 for guidance;

[0038] Step 2: After the rectangular opening 201 of the filter press box 2 is sealed with the end face of one side of the interior of the filter press housing 1, the material is added into the filter press box 2 from the feed port 203, and the filter press plate 3 is pushed by the first hydraulic rod 106 through the connecting rod 301, so that the filter press plate 3 pushes the material to the side of the rectangular opening 201 to filter the material. The filtered liquid seeps out through the front and rear end faces and the lower end face of the filter press box 2 and falls onto the inclined flow guide bottom plate 101. It is then guided to the trapezoidal guide cavity 103 through the inclined flow guide bottom plate 101 and discharged from the drain port 104. When the filter press plate 3 moves, it simultaneously drives the two guide rods 302 to slide along the guide tube 205 to guide the movement of the filter press plate 3.

[0039] Step 3: After the material filtration is completed, the filter press plate 3 is kept stationary, and the two fixing blocks 208 are pulled respectively by the two second hydraulic rods 107, so that the two fixing blocks 208 synchronously drive the filter press box 2 to move, so that the rectangular opening 201 of the filter press box 2 is separated from the end surface of one side inside the filter press box body 1. When the filter press box 2 moves, since the filter press plate 3 remains stationary, the filter cake after filtration is pushed out from the rectangular opening 201 by the filter press plate 3 when the filter press box body 1 moves, thereby realizing filter cake discharge. By controlling the moving distance of the filter press box 2, the filter press plate 3 is moved to the rectangular opening 201 to prevent the filter press plate 3 from being separated from the interior of the filter press box 2. By designing the length of the guide rod 302, the guide rod 302 will not be separated from the interior of the guide tube 205 after the filter press box 2 moves.

[0040] Step 4: Before the second hydraulic rod 107 drives the rectangular opening 201 of the filter press box 2 to separate from one end face of the interior of the filter press housing 1, the third hydraulic rod 6 drives the rectangular door panel 4 to deflect downward through the first rotating shaft 401, so that the dropout port 102 is fully opened. After separating from the rectangular opening 201, the material automatically falls through the dropout port 102 by gravity and is discharged from the interior of the filter press housing 1.

[0041] Step 5: After the filter cake is discharged through the discharge port 102, the third hydraulic rod 6 drives the rectangular door panel 4 to reset, and the two second hydraulic rods 107 synchronously drive the rectangular opening 201 of the filter press box 2 to re-fit and press one end surface of the inner side of the filter press box 1, and then the first hydraulic rod 106 drives the filter press plate 3 to reset, and the next filtration operation can be carried out.

[0042] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A hydraulic filter press, comprising a filter press housing (1), characterized in that: The lower end surface of the filter press housing (1) is provided with an oblique flow guide bottom plate (101), the lower end of the interior of the filter press housing (1) is provided with a trapezoidal flow guide cavity (103) on one side of the oblique flow guide bottom plate (101), the interior of the filter press housing (1) is movably connected to a filter press box (2) on the upper end of the oblique flow guide bottom plate (101), one side of the filter press box (2) is provided with a rectangular opening (201), and the front and rear end surfaces of the filter press box (2) are provided with a rectangular opening (201) away from the rectangular opening (201). One side of the rectangular opening (201) is connected to the interior of the filter press housing (1) and the end face of one side adjacent to the trapezoidal guide cavity (103) via a second hydraulic rod (107); a filter press plate (3) is provided inside the filter press box (2) and on the side away from the rectangular opening (201); a drop opening (102) is provided at the upper end of the lower end face of the oblique guide bottom plate (101); and a rectangular door panel (4) is rotatably connected to the lower end of the drop opening (102).

2. A hydraulic filter press according to claim 1, characterized in that: A sealing ring (202) is provided between one end face of the rectangular opening (201) of the filter press box (2) and the inner end face of the filter press housing (1); the sealing ring (202) is fixedly connected to the filter press box (2); a feed port (203) is provided in the middle of the upper end face of the filter press box (2); and a liquid discharge port (104) is provided at the lower end of the trapezoidal guide cavity (103).

3. The hydraulic filter press according to claim 1, characterized in that: The front and rear end surfaces of the filter press box (2) are fixedly connected to a fixed block (208) on a side away from the rectangular opening (201); the telescopic ends of the two second hydraulic rods (107) are respectively fixedly connected to one side of the two fixed blocks (208); and the other ends of the two second hydraulic rods (107) are connected to the inside of the filter press box (1) and between one end surface adjacent to the trapezoidal guide cavity (103).

4. A hydraulic filter press according to claim 1, characterized in that: Guide support rods (105) are fixedly connected to the upper and lower ends of the front and rear ends between the two side end surfaces inside the filter press housing (1), and guide members (206) are fixedly connected to the upper and lower ends of the two side front and rear end surfaces of the filter press box (2). A guide through hole (207) is provided in the middle of each guide member (206), and the four guide support rods (105) respectively pass through the guide through holes (207) of the multiple guide members (206) on the front and rear end surfaces of the filter press box (2).

5. The hydraulic filter press according to claim 1, characterized in that: A limiting tube (204) is fixedly connected to the middle of the end face of one side of the filter press box (2) away from the rectangular opening (201); a connecting rod (301) is fixedly connected to the middle of the side of the filter press plate (3) adjacent to the limiting tube (204); one end of the connecting rod (301) passes through the limiting tube (204) and extends into the interior of the filter press housing (1); a first hydraulic rod (106) is fixedly connected to the end face of one side of the filter press housing (1); a telescopic end of the first hydraulic rod (106) extends into the interior of the filter press housing (1) and is fixedly connected to one end of the connecting rod (301).

6. The hydraulic filter press according to claim 1, characterized in that: The filter press box (2) is fixedly connected to the front and rear ends of the middle portion of the end face on one side away from the rectangular opening (201) with a guide tube (205), and the filter press plate (3) is fixedly connected to the front and rear ends of the middle portion of the side adjacent to the guide tube (205) with a guide rod (302), and the two guide rods (302) respectively pass through the middle portions of the two guide tubes (205) and extend into the interior of the filter press box (1).

7. The hydraulic filter press according to claim 1, characterized in that: The upper end of the rectangular door panel (4) and the lower end surface of the oblique flow guide bottom plate (101) are rotatably connected via a first rotating shaft (401).

8. The hydraulic filter press according to claim 1, characterized in that: An L-shaped support plate (5) is fixedly connected to the lower end of the end surface of the filter press housing (1) adjacent to the discharge port (102), and a rotating seat (501) is fixedly connected to the lower end of the middle portion of the inner end surface of the L-shaped support plate (5). The rotating seat (501) is connected to the middle portion of the lower end surface of the rectangular door panel (4) via a third hydraulic rod (6).

9. The hydraulic filter press according to claim 8, characterized in that: The lower end of the third hydraulic rod (6) is fixedly connected to a first rotating connection member (601), and the upper end of the telescopic end of the third hydraulic rod (6) is fixedly connected to a second rotating connection member (603). The first rotating connection member (601) is rotationally connected to the rotating seat (501) via a second rotating shaft (602), and the second rotating connection member (603) is rotationally connected to the middle part of the lower end surface of the rectangular door panel (4) via a third rotating shaft (604).

10. A method of use, implemented based on a hydraulic filter press according to any one of claims 1 to 9, characterized in that: The steps include: Step 1: In the initial state, the two second hydraulic rods (107) respectively push the two fixed blocks (208) to move to one side, so that the two fixed blocks (208) synchronously drive the filter press box (2) to move to one side, thereby making the rectangular opening (201) of the filter press box (2) fit tightly with the end face of one side inside the filter press housing (1) and sealed by the sealing ring (202). The filter press box (2) is supported inside the filter press housing (1) by a plurality of guide members (206) and four guide support rods (105). At the same time, when the filter press box (2) moves, the guide through hole (207) on the guide member (206) moves along the guide support rod (105) for guidance; Step 2: After the rectangular opening (201) of the filter press box (2) is sealed against the end face of one side of the inner side of the filter press housing (1), the material is added into the filter press box (2) from the feed port (203), and the filter press plate (3) is pushed by the first hydraulic rod (106) through the connecting rod (301), so that the filter press plate (3) pushes the material toward the side of the rectangular opening (201) to filter the material. The filtered liquid seeps out through the front and rear end faces and the lower end face of the filter press box (2) and falls onto the inclined flow guide bottom plate (101), is guided to the trapezoidal flow guide cavity (103) through the inclined flow guide bottom plate (101) and is discharged from the liquid discharge port (104). When the filter press plate (3) moves, it simultaneously drives the two guide rods (302) to slide along the guide tube (205) to guide the movement of the filter press plate (3); Step 3: After the material filtration is completed, the filter press plate (3) is kept stationary, and the two fixed blocks (208) are pulled respectively by the two second hydraulic rods (107), so that the two fixed blocks (208) synchronously drive the filter press box (2) to move, so that the rectangular opening (201) of the filter press box (2) is separated from the end face of one side inside the filter press box (1). When the filter press box (2) moves, since the filter press plate (3) remains stationary, the filter cake after filtration is pushed out from the rectangular opening (201) by the filter press plate (3) when the filter press box (1) moves, thereby realizing filter cake discharge. By controlling the moving distance of the filter press box (2), the filter press plate (3) is moved to the rectangular opening (201), preventing the filter press plate (3) from being separated from the inside of the filter press box (2). By designing the length of the guide rod (302), the guide rod (302) will not be separated from the inside of the guide tube (205) after the filter press box (2) moves. Step 4: Before the second hydraulic rod (107) drives the rectangular opening (201) of the filter press box (2) to separate from one end face of the interior of the filter press housing (1), the third hydraulic rod (6) drives the rectangular door panel (4) to deflect downward through the first rotating shaft (401), so that the drop opening (102) is fully opened. After the drop opening (201) is separated, the liquid automatically falls down through the drop opening (102) by gravity and is discharged from the interior of the filter press housing (1); Step 5: After the filter cake is discharged through the discharge port (102), the third hydraulic rod (6) drives the rectangular door panel (4) to reset, and the two second hydraulic rods (107) synchronously drive the rectangular opening (201) of the filter press box (2) to re-fit and press the end surface of one side inside the filter press housing (1), and then the first hydraulic rod (106) drives the filter press plate (3) to reset, and the next filtration operation can be carried out.

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