A hydraulic system for a twin-wire pressure filter wet lap machine

Abstract

This application relates to the technical field of hydraulic systems for grouting machines, specifically a hydraulic system for a double-net filter press wet grouting machine. The system includes hydraulic equipment installed on the filter press, comprising a hydraulic telescopic rod, a tension roller, a driven roller, and a limiting block. The filter press also includes a brake mechanism, comprising a base, a mounting ring, a connecting seat, and a trigger element. A limiting guide rod that telescopically engages with the base is installed on one side of the limiting block, and the limiting block abuts against the trigger element. This hydraulic system for the double-net filter press wet grouting machine utilizes a dual-brake structure with a first brake element and a second brake element. The first brake element uses a conical drive groove to quickly brake and limit the hydraulic telescopic rod, while the second brake element uses a positioning insert that engages with the trigger sleeve to lock the trigger element in place. This dual protection effectively prevents accidental displacement of the hydraulic telescopic rod during hydraulic system pressure fluctuations or malfunctions, thus avoiding equipment damage and safety accidents.

Description

Technical Field

[0001] This application relates to the field of hydraulic systems for grouting machines, and in particular to a hydraulic system for a double-net filter press wet grouting machine. Background Technology

[0002] The double-mesh filter press wet pulp mill is a dewatering equipment widely used in papermaking, pulping, environmental protection, and solid-liquid separation. Its core working principle involves two annular mesh belts clamping the pulp, which is then gradually squeezed by multiple pressure rollers, forcibly separating the water from the pulp. To ensure stable squeezing contact between the mesh belts and the pressure rollers, and to prevent the mesh belts from loosening, deviating, or slipping during operation, a tensioning system is typically installed to apply a constant tension force to the mesh belts. Currently, hydraulic tensioning systems are the mainstream choice due to their high output force, convenient adjustment, and ease of automation.

[0003] In a typical double-mesh filter press, the hydraulic system drives the tensioning rollers via hydraulic telescopic rods to tension the conveyor belt. A hydraulic pump station supplies pressurized oil, which, through a control valve assembly, maintains the pressure within the hydraulic cylinders, ensuring the conveyor belt maintains the set tension. However, in actual production, the hydraulic system may experience a sudden loss of pressure due to factors such as aging and ruptured pipelines, loose joints, damaged seals, sudden pump shutdown, or electrical faults. Once this pressure loss occurs, the hydraulic telescopic rods cannot maintain their original position, and the tensioning rollers are forced to retract rapidly under the reaction force of the conveyor belt's own tension. This causes the conveyor belt to quickly loosen, stack, or even detach from the rollers, resulting in serious consequences; it can also lead to conveyor belt slack, misalignment, or even damage, potentially causing safety accidents.

[0004] While existing technologies include electromagnetic brakes or hydraulic locks, they rely on electrical signals or hydraulic pilot pressure, which poses risks of response delays or failures. Therefore, a hydraulic system for a dual-network filter press wet slurry machine is proposed to address the aforementioned problems. Summary of the Invention

[0005] To address the shortcomings of existing technologies and improve safety performance, this application provides a hydraulic system for a dual-net filter press wet slurry machine, which has advantages such as rapid response and reliable locking, thus solving the problems mentioned above.

[0006] This application provides a hydraulic system for a dual-mesh filter press wet slurry machine, which adopts the following technical solution: A hydraulic system for a double-mesh filter press wet slurry machine includes hydraulic equipment installed on the filter press, the hydraulic equipment including a hydraulic telescopic rod, a tensioning roller, a driven roller and a limiting block; The filter press is also equipped with a brake mechanism, which includes a base, a mounting ring, a connecting seat, and a trigger. A limiting guide rod that telescopically cooperates with the base is installed on one side of the limiting block, and the limiting block abuts against the trigger. The mounting ring is equipped with a brake component that cooperates with the trigger and is used for limiting the hydraulic telescopic rod. The triggering element includes a hollow triggering sleeve and a buffer spring fixed between the triggering sleeve and the base. The inner side of the triggering sleeve is provided with a drive groove that abuts against the brake element. The drive groove is conical in shape. The brake assembly includes a telescopic shaft, brake blocks installed at the upper and lower ends of the telescopic shaft, and a ball bearing. The ball bearing engages with the inner side of a conical drive groove to drive the telescopic shaft to lift. A return spring is wound around the outer surface of the telescopic shaft.

[0007] Optionally: The filter press includes a housing, two mesh belts driven inside the housing, and a pressure roller rotatably installed inside the housing for squeezing the two mesh belts. The two mesh belts are distributed vertically, wherein the bottom mesh belt is connected to the tension roller and the driven roller respectively.

[0008] Optionally: The housing has an internal mounting slot, the hydraulic telescopic rod is fixed to the mounting slot inside the housing, and the output end of the hydraulic telescopic rod is fixed to a roller seat. One end of the tension roller is connected to the roller seat bearing. Guide rails are fixed between the upper and lower inner walls of the mounting slot, and the roller seat is slidably mounted between the two guide rails.

[0009] Optionally: The base is installed in the mounting slot. The base, mounting ring and connecting seat are hollow inside. The base has a movable opening and a guide hole. The limiting guide rod passes through the guide hole. The mounting ring is fixedly connected to the connecting seat. The output shaft of the hydraulic telescopic rod passes through the base, mounting ring and connecting seat. The limiting block is located in front of the brake mechanism.

[0010] Optionally: The connecting seat is convex in shape and has a positioning groove on its inner side that abuts against the trigger sleeve. A pressure sensing module is installed inside the positioning groove. The limiting block abuts against the trigger sleeve, causing the trigger sleeve to extend into the machine base and insert into the positioning groove, while simultaneously squeezing the pressure sensing module to detect pressure.

[0011] Optionally: the telescopic shaft slides through the interior of the mounting ring, the brake block is arc-shaped, and there are three brake components, which are distributed equidistantly in a ring around the mounting ring.

[0012] Optionally: The mounting ring and the limiting guide rod are provided with a second brake component for use with the first brake component. The second brake component consists of a return rod, a guide plate and a positioning plug. The guide plate is located inside the movable opening. The guide plate is connected to the return rod to realize the axial drive of the positioning plug, so that it cooperates with the pair of trigger sleeves of the brake component for positioning and locking.

[0013] Optionally: The recovery rod is slidably installed inside the limiting guide rod, wherein the limiting guide rod has a notch communicating with the movable port, and the guide plate is connected to the outer wall of the recovery rod through the notch. A reset spring two fixed inside the limiting guide rod and fixed to one end of the recovery rod is used to displace the guide plate by pressing the recovery rod.

[0014] Optionally: The guide plate includes a plate body and a connecting block fixed to one side of the plate body, wherein the connecting block is fixed to the outer wall of the recovery rod, and a guide surface is provided on the side of the recovery rod away from the connecting block, wherein the guide surface is composed of a straight surface and an inclined surface, and the guide surface abuts against the positioning plug.

[0015] Optionally: The positioning plug includes a plug rod, a second ball bearing rotatably mounted on one end of the plug rod, and a third return spring fixed to the outer surface of the plug rod. The second ball bearing abuts against the guide surface. The plug rod slides through the inside of the connecting seat. The inside of the trigger sleeve is provided with a slot for inserting the plug rod.

[0016] In summary, this application includes at least one of the following beneficial technical effects: 1. This invention, by setting up a double-brake structure with a first brake component and a second brake component, achieves rapid brake limiting of the hydraulic telescopic rod through a conical drive groove, and achieves positioning and locking of the trigger component through the insertion and cooperation of the positioning plug and the trigger sleeve. The double protection can effectively prevent the hydraulic telescopic rod from being accidentally displaced when the hydraulic system pressure fluctuates or malfunctions, thus avoiding equipment damage and safety accidents.

[0017] 2. This invention can achieve precise limit detection and automatic control. By utilizing the pressure sensing module in the positioning groove of the connecting seat, the position signal can be accurately detected by the extrusion of the trigger sleeve. The detection signal is fed back to the control equipment, which can realize the automatic adjustment of the extension and retraction of the hydraulic telescopic rod and the automatic triggering and resetting of the brake mechanism, reducing the intensity of manual operation and improving the automation level of the equipment.

[0018] 3. The present invention, by setting a buffer spring in the trigger component, can buffer the impact force when the limit block abuts against the trigger sleeve, and avoid damage to the components due to rigid collision; at the same time, the setting of the reset spring three in the second brake component can realize the smooth reset of each component, reduce component wear, and extend the overall service life of the hydraulic system. Attached Figure Description

[0019] Figure 1 This is a structural schematic diagram of the casing of this application; Figure 2 This is a structural schematic diagram of the hydraulic equipment of this application; Figure 3 This is a three-dimensional structural drawing of the hydraulic equipment in this application; Figure 4 This is a structural cross-sectional view of the hydraulic equipment and brake mechanism of this application; Figure 5 This is a cross-sectional view of the brake mechanism of this application; Figure 6 This application Figure 5 A magnified structural diagram of structure A is shown below; Figure 7 This is a structural schematic diagram of the second brake component of this application; Figure 8 This application Figure 7 A magnified schematic diagram of structure B is shown.

[0020] Explanation of reference numerals in the attached figures: Filter press; 11. Casing; 12. Mesh belt; 13. Pressure roller; 2. Hydraulic equipment; 21. Hydraulic telescopic rod; 22. Roller seat; 23. Tension roller; 24. Driven roller; 25. Limiting block; 26. Limiting guide rod; 3. Brake mechanism; 31. Base; 311. Movable port; 312. Guide hole; 32. Mounting ring; 33. Connecting seat; 331. Positioning groove; 332. Pressure sensing module; 34. Trigger; 341. Trigger sleeve; 342. Buffer spring 343. Drive slot; 35. Brake component one; 351. Telescopic shaft; 352. Brake block; 353. Ball bearing one; 354. Return spring one; 36. Brake component two; 361. Return rod; 362. Return spring two; 363. Guide plate; 3631. Plate body; 3632. Connecting block; 3633. Guide surface; 364. Positioning plug; 3641. Insert rod; 3642. Ball bearing two; 3643. Return spring three; 3644. Slot; 4. Guide rail. Detailed Implementation

[0021] The following is in conjunction with the appendix Figures 1-8 This application will be described in further detail.

[0022] Example 1, such as Figure 1 and Figure 2As shown, this is the first embodiment of the present invention, which provides a hydraulic system for a double-mesh filter press wet slurry machine, including a hydraulic device 2 installed in the filter press 1. The filter press 1 includes a housing 11, two mesh belts 12 driven and disposed inside the housing 11, and a pressure roller 13 rotatably installed inside the housing 11 for pressing the two mesh belts 12. The two mesh belts 12 are distributed vertically to form a wedge-shaped pressing zone. The bottom mesh belt 12 is respectively connected to a tension roller 23 and a driven roller 24 to adjust the tension of the mesh belt 12. The housing 11 has a fixed mounting slot inside, which extends along the running direction of the mesh belts 12 to accommodate a tension adjustment component.

[0023] like Figures 2-4 As shown, the hydraulic device 2 includes a hydraulic telescopic rod 21, a tensioning roller 23, a driven roller 24, and a limiting block 25. Specifically, a roller seat 22 is fixed to the output end of the hydraulic telescopic rod 21. One end of the tensioning roller 23 is connected to the roller seat 22 via a bearing, and the other end is also connected to the other roller seat 22. To ensure that the tensioning roller 23 moves straight and without skew, cylindrical or square guide rails 4 are fixed between the upper and lower inner walls of the mounting slot. The roller seat 22 is provided with guide holes or linear bearings that slide with the guide rails 4, allowing the roller seat 22 to slide between the two guide rails 4.

[0024] Example 2, as Figures 2-8 As shown, to achieve monitoring and protection of the hydraulic telescopic rod 21, a brake mechanism 3 is also provided on the filter press 1 in this embodiment. The brake mechanism 3 includes a base 31, a mounting ring 32, a connecting seat 33, and a trigger 34. The base 31 is fixedly installed in the mounting slot behind the hydraulic telescopic rod 21, that is, near the end of the hydraulic cylinder body. The interiors of the base 31, the mounting ring 32, and the connecting seat 33 are hollow. The output shaft of the hydraulic telescopic rod 21, such as a piston rod, passes through the central holes of the base 31, the mounting ring 32, and the connecting seat 33 in sequence, and can move freely axially.

[0025] It should be noted that the limiting block 25 is fixedly installed on the output shaft of the hydraulic telescopic rod 21 or on the roller seat 22, and is located in front of the brake mechanism 3, i.e., on the side near the tension roller 23. A limiting guide rod 26, which is telescopically coordinated with the machine base 31, is installed on one side of the limiting block 25 facing the brake mechanism 3. Specifically, a guide hole 312 is provided on the machine base 31, and the limiting guide rod 26 passes through the guide hole 312 and can slide along it. The limiting block 25 abuts against the trigger member 34, and is used to push the trigger member 34 when the hydraulic telescopic rod 21 retracts.

[0026] Specifically, the trigger element 34 includes a hollow trigger sleeve 341 and a buffer spring 342 fixed between the trigger sleeve 341 and the base 31. The trigger sleeve 341 has a stepped cylindrical structure, with its large-diameter end slidingly fitted into the inner hole of the base 31, and its small-diameter end extending into the connecting seat 33. The buffer spring 342 is sleeved on the outside of the trigger sleeve 341, with one end abutting against the shoulder of the trigger sleeve 341 and the other end abutting against the inner end face of the base 31, providing a restoring force for the trigger sleeve 341 and absorbing impact energy. The inner side of the trigger sleeve 341 has a drive groove 343 that abuts against the brake element 35. The drive groove 343 is conical in shape, and its taper can be set according to the required trigger sensitivity, preferably 10-25°.

[0027] like Figure 7 and Figure 8 As shown, the connecting seat 33 is convex in shape, and its inner side has a positioning groove 331 that abuts against the small-diameter end of the trigger sleeve 341. A pressure sensing module 332 is installed inside the positioning groove 331. This pressure sensing module 332 can be a thin-film pressure sensor or a miniature limit switch. When the limit block 25 abuts against the trigger sleeve 341 and pushes the trigger sleeve 341 into the machine base 31, the small-diameter end of the trigger sleeve 341 inserts into the positioning groove 331, simultaneously squeezing the pressure sensing module 332 to detect pressure and generate an electrical signal sent to the filter press controller for alarm or interlock shutdown.

[0028] like Figure 5 and Figure 6 As shown, the mounting ring 32 contains a brake component 35 that works in conjunction with the trigger element 34 and limits the hydraulic telescopic rod 21. The brake component 35 includes a telescopic shaft 351, brake blocks 352 mounted at the upper and lower ends of the telescopic shaft 351, and ball bearings 353. The ball bearings 353 engage with the inner side of a conical drive groove 343 to achieve radial lifting and lowering of the telescopic shaft 351. A return spring 354 is wound around the outer surface of the telescopic shaft 351. Specifically, the mounting ring 32 has multiple radial stepped holes on its circumference, through which the telescopic shaft 351 slides. The return spring 354 is sleeved on the telescopic shaft 351, with one end abutting against the shoulder of the stepped hole and the other end abutting against the shoulder of the telescopic shaft 351, keeping the telescopic shaft 351 away from the hydraulic telescopic rod 21 when not driven.

[0029] It should be noted that the position of the base 31 is adjustable. After the hydraulic device 2 is working, the base 31 can be moved to bring it closer to the limit block 25, thus adjusting the trigger sensitivity. In this embodiment, the brake block 352 has an arc shape, and the curvature of its inner arc surface matches the outer diameter of the hydraulic telescopic rod 21. It can also be bonded or sintered with high-friction materials such as copper-based powder metallurgy or ceramic friction plates. There are three brake components 35, which are equidistantly distributed in a ring around the mounting ring 32, i.e., one every 120°, to ensure a uniform clamping force on the hydraulic telescopic rod 21. It can be understood that the number of brake components 35 can also be two or four, as long as they are arranged symmetrically.

[0030] In operation, when the hydraulic system suddenly loses pressure, such as due to a burst oil pipe or pump shutdown, the tension of the mesh belt 12 forces the tension roller 23 to move backward, and the hydraulic telescopic rod 21 is forced to retract rapidly. The limiting block 25 then moves quickly towards the machine base 31, impacting and pushing the trigger sleeve 341. The trigger sleeve 341 overcomes the elastic force of the buffer spring 342 and retracts into the machine base 31, its small-diameter end gradually inserting into the positioning groove 331. As the trigger sleeve 341 retracts, the conical surface of the drive groove 343 moves relative to the ball bearing 353 towards the smaller diameter section, radially squeezing the ball bearing 353 inward. The ball bearing 353 drives the telescopic shaft 351 to move towards the axis of rotation, overcoming the return spring 354. The brake block 352 grips the body of the hydraulic telescopic rod 21, generating a large static friction force that prevents the hydraulic telescopic rod 21 from retracting further. Because the three brake components 35 operate synchronously, the clamping force is uniform and strong. At the same time, when the sleeve 341 is retracted to its end, the end face of the sleeve squeezes the pressure sensing module 332, generating an alarm signal to realize the protection and detection of the hydraulic system.

[0031] To further enhance the protective effect, such as Figure 5 , Figure 7 and Figure 8 As shown, the mounting ring 32 and the limiting guide rod 26 are equipped with a second brake component 36 for use with the first brake component 35. The second brake component 36 consists of a return rod 361, a guide plate 363, and a positioning plug 364. The guide plate 363 is located inside the movable opening 311 inside the base 31. The guide plate 363 is connected to the return rod 361 to axially drive the positioning plug 364, so that it cooperates with the first brake component 35 to assist in positioning and locking the trigger sleeve 341.

[0032] The recovery rod 361 is slidably installed inside the limiting guide rod 26. Specifically, the limiting guide rod 26 is a hollow rod with an axial blind hole inside, into which the recovery rod 361 is inserted. The side wall of the limiting guide rod 26 has a waist-shaped notch communicating with the movable opening 311, and the guide plate 363 is fixedly connected to the outer wall of the recovery rod 361 through this notch. A second return spring 362, fixed to one end of the recovery rod 361, is fixed inside the limiting guide rod 26. Pressing the protruding end of the recovery rod 361 compresses the second return spring 362, achieving axial displacement of the guide plate 363. It should be noted that a pin is inserted into the end of the limiting guide rod 26 and fixed to the recovery rod 361, which secures the recovery rod 361 and prevents it from sliding during operation.

[0033] like Figure 8 As shown, the guide plate 363 includes a plate body 3631 and a connecting block 3632 fixed to one side of the plate body 3631, wherein the connecting block 3632 is fixed to the outer wall of the return rod 361. A guide surface 3633 is provided on the side of the guide plate 363 away from the connecting block 3632. The guide surface 3633 consists of a straight surface near the connecting block 3632 and an inclined surface away from the connecting block 3632, wherein the inclined surface gradually rises along the pressing direction of the return rod 361. The guide surface 3633 abuts against the positioning plug 364.

[0034] like Figure 8 As shown, the positioning plug 364 includes a plug rod 3641, a ball bearing 3642 rotatably mounted on one end of the plug rod 3641, and a return spring 3643 fixed to the outer surface of the plug rod 3641. The ball bearing 3642 abuts against the guide surface 3633. The plug rod 3641 slides through a radial guide hole opened inside the connecting seat 33. One end of the return spring 3643 abuts against the outer wall of the connecting seat 33, and the other end abuts against the shoulder of the plug rod 3641, so that the ball bearing 3642 always tends to press against the guide surface 3633. The trigger sleeve 341 has a slot 3644 inside for the plug rod 3641 to be inserted. The slot 3644 can be an annular groove or multiple independent blind holes. It should be noted that when the trigger sleeve 341 is retracted to its end, its end face presses against the pressure sensing module 332, generating an alarm signal. Simultaneously, the limiting guide rod 26 moves backward along with the limiting block 25, and the guide plate 363 moves backward. The second ball bearing 3642 slides down from the inclined surface of the guide surface 3633 to the lower plane of the straight surface. Under the action of the third return spring 3643, the insertion rod 3641 moves radially inward, and its tip automatically inserts into the slot 3644 on the trigger sleeve 341, achieving mechanical locking of the trigger sleeve 341 and preventing it from accidentally resetting due to vibration or hydraulic pressure recovery. At this time, the first brake component 35 and the second brake component 36 form a double lock. Furthermore, after the fault is cleared and the hydraulic system resumes oil supply, the operator can manually press the extended end of the return rod 361. The return rod 361 drives the guide plate 363 to move axially, and the inclined surface of the guide surface 3633 pushes up the second ball 3642 again, causing the insertion rod 3641 to exit the slot 3644. The trigger sleeve 341 automatically returns to the extended position under the elastic force of the buffer spring 342. The large diameter section of the drive groove 343 corresponds to the first ball 353. The telescopic shaft 351 of the brake component 35 retracts under the action of the return spring 354, and the brake block 352 releases the hydraulic telescopic rod 21. The entire structure returns to the standby state. Further, the direction of the brake mechanism 3 can also be adjusted. When the hydraulic equipment 2 is working, the hydraulic telescopic rod 21 drives the limit block 25 to abut, thereby locking the position of the hydraulic telescopic rod 21, achieving adjustable clamping and detection, further enhancing the flexibility and applicability of the structure.

[0035] Combined with appendix Figures 1-8 The working principle of the above embodiments is as follows: When the hydraulic equipment 2 is working, the hydraulic telescopic rod 21 extends, pushing the roller seat 22 and the tensioning roller 23 to move along the guide rail 4, thereby tensioning the mesh belt 12. At this time, the limiting block 25 fixed on the output end of the hydraulic telescopic rod 21 or on the roller seat 22 moves forward, and then the machine base 31 is moved to get close to the limiting block 25, so as to realize the status monitoring and protection of the hydraulic equipment 2. When the hydraulic system suddenly loses pressure, the tension of the mesh belt 12 forces the hydraulic telescopic rod 21 to retract rapidly. The limit block 25 then moves backward quickly and impacts and abuts the trigger sleeve 341. The trigger sleeve 341 retracts into the base 31 against the elastic force of the buffer spring 342. During the retraction process, the conical drive groove 343 on the inner side of the trigger sleeve 341 moves relative to the ball bearing 353. As the diameter of the drive groove 343 gradually decreases, it radially squeezes the ball bearing 353 inward, forcing the ball bearing 353 to drive the telescopic shaft 351 to move towards the axis of the mounting ring 32, i.e., the direction of the hydraulic telescopic rod 21, against the elastic force of the return spring 354. The brake block 352 at the end of the telescopic shaft 351 then grips the rod of the hydraulic telescopic rod 21, generating a huge static friction force, preventing the hydraulic telescopic rod 21 from retracting further. At the end of the retracted trigger sleeve 341, its end can be inserted into the positioning groove 331 of the connecting seat 33, and trigger the pressure sensing module 332 to issue an alarm signal. At the same time, the limit guide rod 26 moves with the limit block 25, driving the return rod 361 to move. The return rod 361 drives the guide plate 363 to move along the movable opening 311 of the base 31 through the connecting block 3632. The guide surface 3633 of the guide plate 363 abuts against the second ball 3642 of the positioning plug 364, pushing the plug rod 3641 to slide along the connecting seat 33 and insert into the slot 3644 of the trigger sleeve 341, thereby realizing the positioning and locking of the trigger sleeve 341, forming a double locking of the first brake component 35 and the second brake component 36, further improving the limit stability. When the brake needs to be released, the reset lever 361 can be pressed manually. The guide plate 363 drives the positioning plug 364 to exit from the slot 3644. The trigger sleeve 341 is reset under the action of the buffer spring 342, and the brake component 35 is also released by the reset spring 354, releasing the hydraulic telescopic rod 21.

[0036] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A hydraulic system for a double-mesh filter press wet slurry machine, comprising a hydraulic device (2) installed on the filter press (1), characterized in that: The hydraulic device (2) includes a hydraulic telescopic rod (21), a tensioning roller (23), a driven roller (24), and a limiting block (25). The filter press (1) is also equipped with a brake mechanism (3), which includes a base (31), a mounting ring (32), a connecting seat (33), and a trigger (34). A limiting guide rod (26) that is telescopically coordinated with the base (31) is installed on one side of the limiting block (25), and the limiting block (25) and the trigger (34) abut against each other. A brake component (35) is provided inside the mounting ring (32) to cooperate with the trigger (34) and to limit the hydraulic telescopic rod (21). The trigger (34) includes a hollow trigger sleeve (341) and a buffer spring (342) fixed between the trigger sleeve (341) and the base (31). The inner side of the trigger sleeve (341) is provided with a drive groove (343) that abuts against the brake component (35). The drive groove (343) is conical in shape. The brake component (35) includes a telescopic shaft (351), brake blocks (352) installed at the upper and lower ends of the telescopic shaft (351), and a ball bearing (353). The ball bearing (353) abuts against the inner side of the conical drive groove (343) to realize the lifting drive of the telescopic shaft (351). A return spring (354) is wound around the outer surface of the telescopic shaft (351).

2. The hydraulic system of a double-mesh filter press wet slurry machine according to claim 1, characterized in that: The filter press (1) includes a housing (11), two mesh belts (12) which are driven inside the housing (11), and a pressure roller (13) which is rotatably installed inside the housing (11) for squeezing the two mesh belts (12). The two mesh belts (12) are distributed vertically, wherein the bottom mesh belt (12) is connected to the tension roller (23) and the driven roller (24) respectively.

3. The hydraulic system of a double-mesh filter press wet slurry machine according to claim 2, characterized in that: The housing (11) has an internal mounting slot. The hydraulic telescopic rod (21) is fixed in the mounting slot inside the housing (11). The output end of the hydraulic telescopic rod (21) is fixed with a roller seat (22). One end of the tension roller (23) is connected to the roller seat (22) bearing. Guide rails (4) are fixed between the upper and lower inner walls of the mounting slot. The roller seat (22) is slidably installed between the two guide rails (4).

4. The hydraulic system of a double-mesh filter press wet slurry machine according to claim 3, characterized in that: The base (31) is installed in the mounting slot. The interior of the base (31), mounting ring (32) and connecting seat (33) is hollow. The base (31) is provided with a movable opening (311) and a guide hole (312). The limiting guide rod (26) passes through the interior of the guide hole (312). The mounting ring (32) is fixedly connected to the connecting seat (33). The output shaft of the hydraulic telescopic rod (21) passes through the interior of the base (31), mounting ring (32) and connecting seat (33). The limiting block (25) is located in front of the brake mechanism (3).

5. The hydraulic system of a double-mesh filter press wet slurry machine according to claim 1, characterized in that: The connecting seat (33) is convex in shape, and a positioning groove (331) is provided on its inner side to abut against the trigger sleeve (341). A pressure sensing module (332) is installed on the inner side of the positioning groove (331). The trigger sleeve (341) is abutted against by the limiting block (25), so that the trigger sleeve (341) extends into the machine base (31) and inserts into the positioning groove (331), while squeezing the pressure sensing module (332) to detect pressure.

6. The hydraulic system of a double-mesh filter press wet slurry machine according to claim 1, characterized in that: The telescopic shaft (351) slides through the interior of the mounting ring (32), the brake block (352) is arc-shaped, and there are three brake components (35), which are distributed equidistantly around the mounting ring (32).

7. The hydraulic system of a double-mesh filter press wet slurry machine according to claim 4, characterized in that: The mounting ring (32) and the limiting guide rod (26) are provided with a second brake (36) for use with the first brake (35). The second brake (36) consists of a return rod (361), a guide plate (363) and a positioning plug (364). The guide plate (363) is located inside the movable port (311). The guide plate (363) is connected to the return rod (361) to realize the axial drive of the positioning plug (364) so ​​that it can cooperate with the first brake (35) to position and lock the trigger sleeve (341).

8. The hydraulic system of a double-mesh filter press wet slurry machine according to claim 7, characterized in that: The recovery rod (361) is slidably installed inside the limiting guide rod (26). The limiting guide rod (26) has a notch that communicates with the movable port (311), and the guide plate (363) is connected to the outer wall of the recovery rod (361) through the notch. The limiting guide rod (26) has a second reset spring (362) fixed inside it and fixed to one end of the recovery rod (361). The displacement of the guide plate (363) is achieved by pressing the recovery rod (361).

9. The hydraulic system of a double-mesh filter press wet slurry machine according to claim 7, characterized in that: The guide plate (363) includes a plate body (3631) and a connecting block (3632) fixed to one side of the plate body (3631). The connecting block (3632) is fixed to the outer wall of the recovery rod (361). A guide surface (3633) is provided on the side of the recovery rod (361) away from the connecting block (3632). The guide surface (3633) is composed of a straight surface and an inclined surface. The guide surface (3633) abuts against the positioning plug (364).

10. The hydraulic system of a double-mesh filter press wet slurry machine according to claim 9, characterized in that: The positioning plug (364) includes a plug rod (3641), a ball bearing two (3642) rotatably mounted on one end of the plug rod (3641), and a return spring three (3643) fixed to the outer surface of the plug rod (3641). The ball bearing two (3642) abuts against the guide surface (3633). The plug rod (3641) slides through the inside of the connecting seat (33). The inside of the trigger sleeve (341) is provided with a slot (3644) for inserting the plug rod (3641).

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