Self-locking hydraulic device for filter press

Abstract

The utility model discloses a self-locking hydraulic device for a filter press, which comprises a hydraulic cylinder, a self-locking hydraulic cylinder, a self-locking hydraulic cylinder, a self-locking hydraulic cylinder, a self-locking hydraulic cylinder body and a self-locking hydraulic cylinder body, and is characterized in that one end of the hydraulic cylinder is communicated with the outside; the telescopic assembly slides in the hydraulic cylinder in a sealing manner and is used for jacking a filter plate of the filter press; the pull-back assembly is used for driving the telescopic assembly to reset; the limiting assembly is rotationally arranged outside the telescopic assembly in a threaded mode and used for limiting the position of the telescopic assembly; by arranging the telescopic assembly and the pull-back assembly, the telescopic assembly is connected with the hydraulic pump so that the device can stretch out to pressurize the load end, the pull-back assembly is connected with the hydraulic pump so that automatic pull-back of the load end can be achieved, and the positions, connected with the hydraulic pump, of the telescopic assembly and the pull-back assembly are located on the same side; and through the arranged limiting assembly, self-locking pressure maintaining of the equipment on the load end of the telescopic assembly is achieved through the self-locking performance of thread transmission, traditional oil pressure pump pressure maintaining is replaced, and the use energy consumption of the equipment is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic devices, in particular to a self-locking hydraulic device for a filter press. Background Art

[0002] The hydraulic cylinder of the existing filter press is realized by an automatic pressure-maintaining device, which connects a hydraulic station or a hydraulic pump at one end of the hydraulic cylinder, and the pressure gauge on the hydraulic station detects the hydraulic pressure in the rodless chamber of the hydraulic cylinder. According to the pressure value set independently at the load end, when the hydraulic pressure is lower than the set lower limit, the oil pump of the hydraulic station starts to supply oil to the hydraulic cylinder, and when the pressure rises to the set upper limit, the hydraulic oil pump stops to realize the pressure-maintaining operation of the hydraulic cylinder.

[0003] When the hydraulic cylinder of a traditional filter press is reset, a hydraulic pump is connected to the other end of the hydraulic cylinder to reset the hydraulic cylinder through a high-pressure oil pump. This method requires that both ends of the hydraulic cylinder be connected to a hydraulic station respectively, and the pipelines are distributed on both sides of the hydraulic cylinder, which places high requirements on the quality of the oil pipelines and makes the load pull-back operation inconvenient. In addition, during the operation of the filter press, the hydraulic station needs to maintain continuous pressure, which consumes huge energy.

[0004] Therefore, in view of the above problems, it is urgent to design a hydraulic device with a self-locking and pressure-maintaining function and a convenient load-end pull-back method. Utility Model Content

[0005] The purpose of the utility model is to provide a self-locking hydraulic device for a filter press to solve the problems raised in the above background technology. The following technical solution is provided: A self-locking hydraulic device for a filter press, comprising:

[0006] A hydraulic cylinder, one end of which is connected to the outside world and the other end of which is provided with a sealing bottom plate;

[0007] A telescopic component, one end of which is sealed and slides inside the hydraulic cylinder, and the other end of which passes through one end of the hydraulic cylinder and extends outward to the outside world. The extended end of the telescopic component is used to press against the filter plate of the filter press;

[0008] The pull-back component is arranged inside the telescopic component, and one end of the pull-back component is adjacent to the sealing bottom plate, and the pull-back component is used to drive the telescopic component to reset;

[0009] The limit assembly is threadedly arranged on the outside of the telescopic assembly, and the limit assembly can move along the axial diameter direction of the telescopic assembly and be limited and locked with one end of the hydraulic cylinder to limit the position of the telescopic assembly.

[0010] In this technical solution, one end of the telescopic assembly and the pullback assembly are respectively connected to a hydraulic oil pump for power transmission (the hydraulic oil pump is not shown in the figure). When the device is in use, the extended end of the telescopic assembly supports the load end (i.e., the filter plate of the filter press) and the load end is installed in a compact manner;

[0011] When the filter plate needs to be compressed, high-pressure oil is injected into the telescopic assembly through the oil pump, and the oil drives the end of the telescopic assembly to extend and compress the load end. When the end of the telescopic assembly is pressed against the load end, the rated working pressure of the oil pump is calibrated to 25MP. The operator can adjust the pressure of the oil pumped into the telescopic assembly according to the load end to achieve different output powers to the load end;

[0012] When the telescopic assembly is extended to press against the load end, the limit assembly is rotated. The limit assembly is threadedly connected to the outer end of the telescopic assembly and can move along the axial diameter of the telescopic assembly. Therefore, the limit assembly is rotated to move it until one end of the limit assembly is against one end of the hydraulic cylinder. At this time, the limit assembly locks the position of the telescopic assembly and the position of the load end is fixed. At this time, the oil pump entering the telescopic assembly can be closed, and mechanical locking is used to replace the oil pump to maintain pressure, thereby reducing energy consumption.

[0013] When the load end is pressurized, the limit assembly is reset, and then the oil is pumped into the pull-back assembly through the oil pump. The oil drives the telescopic assembly to reset through the pull-back assembly, thereby completing the pull-back of the load end.

[0014] In any of the above technical solutions, further, the telescopic component includes:

[0015] The first piston is sealed and slidably arranged inside the hydraulic cylinder, and a telescopic rod is arranged in the middle of the first piston, and a reset cavity is arranged inside the telescopic rod; a first oil pump hole is arranged on the sealing bottom plate, and the first oil pump hole is respectively connected with the hydraulic cylinder and the outside.

[0016] In the present technical solution, the first piston is sealed and slidably arranged inside the hydraulic cylinder. When the telescopic assembly is extended, one end of the first pump oil hole is connected to the oil pump, and the oil is pumped into the hydraulic cylinder through the first pump oil hole to contact the bottom surfaces of the first piston and the telescopic rod. F=ΔP·S, ΔP=P1-P, (P1 is the pressure of the pumped oil, and P is the standard atmospheric pressure), a pressure difference is generated at the bottom surfaces of the first piston and the telescopic rod, thereby driving the telescopic assembly to extend outward from the hydraulic cylinder until the end of the telescopic rod contacts the load end.

[0017] In any of the above technical solutions, further, the pullback component includes:

[0018] A sealing member is sealed at one end of the reset chamber, a guide rod is fixedly provided on one side of the sealing bottom plate, the sealing member is slidably sleeved on the guide rod, a pull-back piston is provided at the other end of the guide rod, and the pull-back piston seal slides inside the reset chamber; a second oil pumping hole is opened inside the guide rod along its axial diameter direction, an oil outlet hole is provided at one end of the second oil pumping hole, and the second oil pumping hole is communicated with the reset chamber through the oil outlet hole.

[0019] In the present technical solution, when the telescopic assembly needs to be pulled back, one end of the second pump oil hole is connected to a high-pressure oil pump (not shown in the figure) with a pressure of 25MP. The high-pressure oil is injected into the second pump oil hole and flows into the reset chamber through the oil outlet hole. Since the pull-back piston seal slides at the end of the guide rod, the oil can only flow into the cavity between the seal and the middle part of the pull-back piston, and the cross-sectional area of ​​the seal is smaller than the cross-sectional area of ​​the reset chamber. Since F=P·S, one side of the seal is forced to slide along the guide rod, and the seal and the telescopic assembly are fixed as a whole, thereby driving the load at the end of the telescopic assembly to be pulled back.

[0020] In any of the above technical solutions, further, the outer surface of the telescopic rod is columnar and has threads evenly arranged thereon; the limiting assembly includes a sleeve, the sleeve is threadedly connected to the telescopic rod, a limiting disk is arranged on the sleeve, and a limiting platform is arranged at one end of the hydraulic cylinder, and one side of the limiting platform is limited and locked with one side of the limiting disk.

[0021] In this technical solution, the sleeve and the limit plate are rotated as a whole to move around the thread on the outer cylindrical surface of the telescopic rod until one end of the sleeve is stuck on the limit platform. At this time, the telescopic assembly is mechanically locked by the thread to ensure that the position of the load end is fixed. At this time, the oil pump can be turned off, realizing zero energy consumption and pressure maintenance of the equipment.

[0022] Beneficially, in order to ensure that the limit plate can rotate by itself to achieve mechanical self-locking of the entire device, a driven gear is usually added to the outside of the limit plate, and the limit plate is driven to rotate by gear transmission. In order to ensure that the transmission gear can move synchronously with the limit plate, a baffle can be added at the gear meshing point, or a slide rail with the same direction as the telescopic rod shaft diameter or other structures with sliding function can be used at the transmission end of the gear.

[0023] By setting up a telescopic component and a pull-back component, the telescopic component is connected to the hydraulic pump to extend the device and pressurize the load end, and the pull-back component is connected to the hydraulic pump to realize automatic pullback of the load end. The positions where the two are connected to the hydraulic pump are placed on the same side, and a separate external hydraulic pipeline is no longer required to facilitate the connection of the hydraulic pump. Furthermore, through the setting of the limit component, the self-locking property of the threaded transmission is utilized to realize the self-locking pressure maintenance of the load end of the telescopic component, which replaces the traditional hydraulic pump pressure maintenance and reduces the energy consumption of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the utility model;

[0025] Figure 2 yes Figure 1 A partial enlarged schematic diagram of

[0026] Figure 3 It is a three-dimensional schematic diagram of the limit assembly in the utility model. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0028] In the description of the present application, it should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0029] Embodiment 1:

[0030] like Figure 1-2 As shown, this embodiment provides a self-locking hydraulic device for a filter press, comprising:

[0031] A hydraulic cylinder 10, one end of which is in communication with the outside, and a sealing bottom plate 12 is provided at the other end;

[0032] The telescopic component 20 has one end that is sealed and slides inside the hydraulic cylinder 10, and the other end of the telescopic component 20 passes through one end of the hydraulic cylinder 10 and extends to the outside. The extended end of the telescopic component 20 is used to press against the filter plate of the filter press;

[0033] The pull-back assembly is arranged inside the telescopic assembly 20, and one end of the pull-back assembly is adjacent to the sealing bottom plate 12. The pull-back assembly is used to drive the telescopic assembly 20 to reset;

[0034] The limit assembly 40 is threadably disposed on the outside of the telescopic assembly 20 , and the limit assembly 40 can move along the axial direction of the telescopic assembly 20 and be limitedly locked with one end of the hydraulic cylinder 10 to limit the position of the telescopic assembly 20 .

[0035] In this technical solution, one end of the telescopic assembly 20 and the pullback assembly are respectively connected to a hydraulic oil pump for power transmission (the hydraulic oil pump is not shown in the figure). When the device is in use, the extended end of the telescopic assembly 20 is against the load end (i.e., the filter plate of the filter press), and the load end is installed in a compact manner;

[0036] When the filter plate needs to be pressed, high-pressure oil is injected into the telescopic assembly 20 through the oil pump, and the oil drives the end of the telescopic assembly 20 to extend and press the load end. When the end of the telescopic assembly 20 is pressed against the load end, the rated working pressure of the oil pump is calibrated to 25MP. The operator can adjust the pressure of the oil pumped into the telescopic assembly 20 according to the load end to achieve different output powers to the load end;

[0037] When the telescopic assembly 20 is extended to press against the load end, the limit assembly 40 is rotated. The limit assembly 40 is threadedly connected to the outer end of the telescopic assembly 20 and can move along the axial direction of the telescopic assembly 20. Therefore, the limit assembly 40 is rotated to move it until one end of the limit assembly 40 is against one end of the hydraulic cylinder 10. At this time, the limit assembly 40 locks the position of the telescopic assembly 20, and the position of the load end is fixed. At this time, the oil pump entering the telescopic assembly 20 can be closed, and mechanical locking is used to replace the oil pump to maintain pressure, thereby reducing energy consumption.

[0038] When the load end is pressurized, the limit assembly 40 is reset, and then the oil is pumped into the pull-back assembly through the oil pump. The oil drives the telescopic assembly 20 to reset through the pull-back assembly, thereby completing the load end pull-back.

[0039] Embodiment 2:

[0040] like Figure 1 As shown, specifically, the telescopic assembly 20 includes:

[0041] A first piston 21 is sealed and slidably disposed inside the hydraulic cylinder 10, and a telescopic rod 22 is disposed in the middle of the first piston 21, and a reset chamber 24 is disposed inside the telescopic rod 22; a first oil pumping hole 23 is disposed on the sealing bottom plate 12, and the first oil pumping hole 23 is respectively connected to the hydraulic cylinder 10 and the outside world.

[0042] In the present technical solution, the first piston 21 is sealingly and slidably arranged inside the hydraulic cylinder 10. When the telescopic assembly 20 is extended, one end of the first oil pump hole 23 is connected to the oil pump. The oil is pumped into the hydraulic cylinder 10 through the first oil pump hole 23 to contact the bottom surfaces of the first piston 21 and the telescopic rod 22. According to F=ΔP·S, ΔP=P1-P, (P1 is the pressure of the pumped oil, and P is the standard atmospheric pressure), a pressure difference is generated at the bottom surfaces of the first piston 21 and the telescopic rod 22, thereby driving the telescopic assembly 20 to extend outward from the hydraulic cylinder 10 until the end of the telescopic rod 22 contacts the load end.

[0043] Embodiment 3:

[0044] like Figure 2 As shown, specifically, the pullback assembly includes: a seal 31, which is sealably arranged at one end of the reset chamber 24, a guide rod 32 is fixedly arranged on one side of the sealing bottom plate 12, the seal 31 is slidably sleeved on the guide rod 32, a pullback piston 35 is arranged at the other end of the guide rod 32, and the pullback piston 35 seals and slides inside the reset chamber 24; a second oil pumping hole 33 is opened inside the guide rod 32 along its axial diameter direction, an oil outlet hole 34 is arranged at one end of the second oil pumping hole 33, and the second oil pumping hole 33 is communicated with the reset chamber 24 through the oil outlet hole 34.

[0045] In the present technical solution, when it is necessary to pull back the telescopic assembly 20, one end of the second oil pump hole 33 is connected to a high-pressure oil pump (not shown in the figure) with a pressure of 25MP. The high-pressure oil is injected into the second oil pump hole 33 and flows into the reset chamber 24 through the oil outlet hole 34. Since the pull-back piston 35 is sealed and slides at the end of the guide rod 32, the oil can only flow into the cavity in the middle of the seal 31 and the pull-back piston 35 at this time, and the cross-sectional area of ​​the seal 31 is smaller than the cross-sectional area of ​​the reset chamber 24. Since F=P·S, one side of the seal 31 is forced to slide along the guide rod 32 at this time, and the seal 31 and the telescopic assembly 20 are fixed as a whole, thereby realizing the pulling back of the end load of the telescopic assembly 20.

[0046] Embodiment 4:

[0047] like Figure 1-3 As shown, specifically, the outer surface of the telescopic rod 22 is columnar and is evenly provided with threads; the limiting assembly 40 includes a sleeve 41, the sleeve 41 is threadedly connected to the telescopic rod 22, a limiting plate 42 is provided on the sleeve 41, and a limiting platform 13 is provided at one end of the hydraulic cylinder 10, and one side of the limiting platform 13 is limited and locked with one side of the limiting plate 42.

[0048] In the present technical solution, the sleeve 41 and the limit plate 42 are rotated as a whole to move around the thread on the outer cylindrical surface of the telescopic rod 22 until one end of the sleeve 41 is stuck on the limit platform 13. At this time, the telescopic assembly 20 is mechanically locked by the thread to ensure that the position of the load end is fixed. At this time, the oil pump can be turned off, realizing zero energy consumption and pressure maintenance of the equipment.

[0049] Beneficially, in order to ensure that the limit plate 42 can rotate by itself to achieve mechanical self-locking of the entire device, a driven gear is usually added to the outside of the limit plate 42, and the limit plate 42 is driven to rotate by gear transmission. In order to ensure that the transmission gear can move synchronously with the limit plate 42, a baffle can be added at the gear meshing point, or a slide rail with the same direction as the axial diameter of the telescopic rod 22 or other structures with sliding function can be used at the transmission end of the gear.

[0050] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A self-locking hydraulic device for a filter press, characterized in that: include: A hydraulic cylinder (10), one end of which is in communication with the outside, and the other end of which is provided with a sealing bottom plate (12); A telescopic component (20), one end of the telescopic component (20) is sealed and slides inside the hydraulic cylinder (10), the other end of the telescopic component (20) passes through one end of the hydraulic cylinder (10) and protrudes to the outside, and the protruding end of the telescopic component (20) is used to press against the filter plate of the filter press; A pull-back assembly (30) is arranged inside the telescopic assembly (20), and one end of the pull-back assembly (30) is adjacent to the sealing bottom plate (12), and the pull-back assembly (30) is used to drive the telescopic assembly (20) to reset; A limit assembly (40) is threadably arranged outside the telescopic assembly (20), and the limit assembly (40) can move along the axial direction of the telescopic assembly (20) and be locked with one end of the hydraulic cylinder (10) to limit the position of the telescopic assembly (20).

2. A self-locking hydraulic device for a filter press according to claim 1, characterized in that: The telescopic assembly (20) comprises: A first piston (21) is sealingly and slidably disposed inside the hydraulic cylinder (10), a telescopic rod (22) is disposed in the middle of the first piston (21), and a reset chamber (24) is disposed inside the telescopic rod (22).

3. A self-locking hydraulic device for a filter press according to claim 2, characterized in that: The outer surface of the telescopic rod (22) is columnar and is evenly provided with threads.

4. A self-locking hydraulic device for a filter press according to claim 2, characterized in that: The sealing bottom plate (12) is provided with a first oil pump hole (23), and the first oil pump hole (23) is respectively connected to the hydraulic cylinder (10) and the outside world.

5. A self-locking hydraulic device for a filter press according to claim 2, characterized in that: The pull-back assembly (30) comprises: A sealing member (31) is sealingly arranged at one end of the reset chamber (24); a guide rod (32) is fixedly arranged on one side of the sealing bottom plate (12); the sealing member (31) is slidably sleeved on the guide rod (32); a pull-back piston (35) is provided at the other end of the guide rod (32); and the pull-back piston (35) seals and slides inside the reset chamber (24).

6. A self-locking hydraulic device for a filter press according to claim 5, characterized in that: A second oil pumping hole (33) is provided inside the guide rod (32) along the axial direction thereof, an oil outlet hole (34) is provided at one end of the second oil pumping hole (33), and the second oil pumping hole (33) is communicated with the reset chamber (24) through the oil outlet hole (34).

7. A self-locking hydraulic device for a filter press according to claim 3, characterized in that: The limiting component (40) comprises: A sleeve (41) is threadedly connected to the telescopic rod (22), a limiting plate (42) is provided on the sleeve (41), and a limiting platform (13) is provided at one end of the hydraulic cylinder (10), and one side of the limiting platform (13) is limitedly locked with one side of the limiting plate (42).

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