Hydraulic system of ultrahigh pressure filter press

Abstract

The utility model discloses a hydraulic system of an ultrahigh pressure filter press. The hydraulic system comprises a hydraulic oil tank, the servo pump system is communicated with the hydraulic oil tank; the low-pressure pump and the servo pump system are both communicated with the three-position four-way electro-hydraulic reversing valve; the low-pressure pump is connected with the driving hydraulic cylinder through the three-position four-way electro-hydraulic reversing valve and is used for pushing a piston of the driving hydraulic cylinder to advance in an initial state; and the driving hydraulic cylinder is communicated with a plurality of driven hydraulic cylinders through a two-way cartridge valve unit 1. According to the utility model, the servo system is applied to the filter press, and due to the use of the servo pump system, the sensitivity of equipment is higher, the response speed is high, and hydraulic impact is not generated. Meanwhile, due to the fact that the response speed is high, pressure can be dynamically matched, and the stability of equipment is better.

Description

Technical Field

[0001] The utility model relates to the technical field of high-pressure filter presses, in particular to a hydraulic system for an ultra-high-pressure filter press. Background Art

[0002] The hydraulic system used in traditional sludge dewatering generally directly drives a few (1 or 2) hydraulic cylinders through a pump to press the hydraulic oil out of the hydraulic tank. Because the number of hydraulic cylinders is small, a single pump can continuously advance and pressurize the cylinders, outputting energy through hydraulic valves and hydraulic pipelines to compress the sludge. The defects of traditional hydraulic systems are:

[0003] (1) It is insensitive to changes in system load. When the load changes, the excess power will put pressure on the entire system, causing loss of equipment and system. If the response is not timely, there will be safety risks.

[0004] (2) During the sludge dewatering process, considering the oil leakage and load changes, the pump is always in the power output state. Although there is no need to replenish oil, the pump still works all the time, resulting in energy loss;

[0005] (3) Once an emergency such as a power outage occurs, the pump stops supplying hydraulic oil. At this time, if the proportional valve is still open, the pressure in the hydraulic cylinder will drop rapidly, causing safety problems. Utility Model Content

[0006] The purpose of the present utility model is to solve the above problems and provide an ultra-high pressure filter press hydraulic system.

[0007] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0008] An ultra-high pressure filter press hydraulic system includes a hydraulic oil tank;

[0009] a servo pump system, the servo pump system being in communication with the hydraulic oil tank;

[0010] The low-pressure pump and the servo pump system are both connected to the three-position four-way electro-hydraulic reversing valve;

[0011] The low-pressure pump is connected to the active hydraulic cylinder via the three-position four-way electro-hydraulic reversing valve, and is used to push the piston of the active hydraulic cylinder forward in the initial state;

[0012] The active hydraulic cylinder is connected to a plurality of passive hydraulic cylinders via a two-way cartridge valve unit.

[0013] As a further description of the above technical solution, the servo pump system includes a plunger pump unit and a vane pump unit arranged in parallel.

[0014] As a further description of the above technical solution, the plunger pump unit includes a plunger pump and a first motor. The plunger pump is connected to the first motor through a new type of plum blossom coupling, and the plunger pump is connected with a proportional valve.

[0015] As a further description of the above technical solution, the vane pump unit includes a vane pump and a second motor. The vane pump is connected to the second motor through a new type of plum blossom coupling.

[0016] As a further description of the above technical solution, a pressure gauge one, a pressure transmitter one and a relief valve one are arranged on the connecting pipeline between the plunger pump unit and the three-position four-way electro-hydraulic reversing valve.

[0017] As a further description of the above technical solution, the two-way cartridge valve unit one includes a two-way cartridge valve one, a cartridge valve cover plate one and an electromagnetic reversing valve one.

[0018] As a further description of the above technical solution, there are four passive hydraulic cylinders, and the passive hydraulic cylinders are connected with the two-way cartridge valve unit two. The two-way cartridge valve unit two includes a two-way cartridge valve two, a cartridge valve cover plate two and an electromagnetic reversing valve two.

[0019] As a further description of the above technical solution, an oil return filter is arranged on the low-pressure pump pipeline, and a relief valve two and a pressure gauge two are connected between the pipeline of the low-pressure pump and the pipeline of the vane pump unit.

[0020] As a further description of the above technical solution, the two-way cartridge valve unit one and the two-way cartridge valve unit two form an oil return passage at the tail of the four passive hydraulic cylinders

[0021] The beneficial effects of the present utility model are as follows:

[0022] 1. In the present utility model, the servo system is applied to the filter press. The use of the servo pump system makes the equipment highly sensitive, with a fast response speed and no hydraulic shock. At the same time, because of the fast response speed, the pressure can be dynamically matched. In summary, the use of the servo pump system can make the equipment more stable.

[0023] To more clearly elaborate the structural features and functions of the present utility model, the present utility model will be described in detail below with reference to the attached drawings and specific embodiments. Description of the Drawings

[0024] Figure 1 It is a schematic diagram of the ultra-high pressure filter press hydraulic system proposed by the present utility model.

[0025] Reference numerals: 1, plunger pump; 2, bell housing I; 3, motor I; 4, proportional valve; 5, vane pump; 6, bell housing II; 7, motor II; 8, relief valve I; 9, check valve I; 10, two-way cartridge valve I; 11, cartridge valve cover plate I; 12, solenoid directional valve I; 13, two-way cartridge valve II; 14, cartridge valve cover plate II; 15, solenoid directional valve II; 16, pressure gauge II; 17, pressure transmitter II; 18, three-position four-way electro-hydraulic directional valve; 19, new type of jaw coupling I; 20, new type of jaw coupling II; 21, relief valve II; 22, return oil filter; 23, pressure gauge I; 24, pressure transmitter I; 25, pressure gauge III; 26, hydraulic oil tank; 27, check valve II; 28, active hydraulic cylinder; 29, passive hydraulic cylinder. Detailed implementation mode

[0026] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.

[0027] A hydraulic system for an ultra-high pressure filter press provided in this application has a proportional valve 4 built into a plunger pump 1, and the plunger pump 1 and a vane pump 5 are connected in parallel. First, a low-pressure pump (not shown in the figure) drives the piston of an active hydraulic cylinder 28 to advance through an electro-hydraulic directional valve, drives a passive hydraulic cylinder through valve adjustment and transformation, and the passive hydraulic cylinder is filled with oil by a make-up oil valve. After completion, the low-pressure pump is closed, and a high-pressure servo pump (i.e., a servo pump system) is started. Then, the high-pressure pump pressurizes and drives five hydraulic cylinders to provide high pressure. After that, the high-pressure pump continuously operates, and in response to load changes, it timely responds and outputs the required power. By applying the above technical solution, the servo system is applied to the filter press. The use of the servo pump system makes the equipment highly sensitive, has a fast response speed, and does not generate hydraulic shock. At the same time, because of the fast response speed, the pressure can be dynamically matched. In summary, the use of the servo pump system can make the equipment more stable.

[0028] Specifically, please refer to Figure 1 As shown, in one embodiment, a hydraulic system for an ultra-high pressure filter press specifically includes:

[0029] The hydraulic oil tank 26 serves as the hydraulic oil supply device for the entire hydraulic system. The servo pump system and the low-pressure pump are both connected to the hydraulic oil tank 26. At the same time, the servo pump system and the low-pressure pump are both connected to the three-position four-way electro-hydraulic reversing valve 18 through hydraulic pipelines. The three-position four-way electro-hydraulic reversing valve 18 is connected to the active hydraulic cylinder 28, and the active hydraulic cylinder 28 is connected to a plurality of passive hydraulic cylinders through the two-way cartridge valve unit one. Preferably, four passive hydraulic cylinders are provided. In the initial state, the three-position four-way electro-hydraulic reversing valve 18 is in the flow state of channel A. In this state, the low-pressure pump drives the active hydraulic cylinder 28 to move forward, the oil replenishing valve opens, and the high-level oil tank replenishes oil to the passive oil cylinders. After the low-pressure pump is closed, the high-pressure pump is turned on, and the high-pressure pump provides pressure for all the oil tanks. After the high-pressure pump is closed, the three-position four-way electro-hydraulic reversing valve 18 is in the flow state of channel B, the low-pressure pump is turned on, and the hydraulic oil in the oil tank all returns.

[0030] Further, the servo pump system includes a piston pump 1 unit and a vane pump 5 unit arranged in parallel. The piston pump 1 unit includes a piston pump 1 and a motor one 3. The piston pump 1 is connected to the motor one 3 through a new type of plum blossom coupling one 19. The piston pump 1 is connected with a proportional valve 4. The vane pump 5 unit includes a vane pump 5 and a motor two 7. The vane pump 5 and the motor two 7 are connected through a new type of plum blossom coupling two 20. During the actual operation process, the piston pump 1 is always in the working state, but the output power of the piston pump 1 can vary according to the demand, which can greatly reduce the energy consumption.

[0031] Further, a pressure gauge one 23, a pressure transmitter one 24, and a relief valve one 8 are arranged on the connecting pipeline between the piston pump 1 unit and the three-position four-way electro-hydraulic reversing valve 18. The pressure of the piston pump 1 unit can be detected in real time through the pressure gauge one 23 and the pressure transmitter.

[0032] Further, the passive hydraulic cylinder is connected to the two-way cartridge valve unit two. The two-way cartridge valve unit two includes a two-way cartridge valve two 13, a cartridge valve cover two 14, and an electromagnetic reversing valve two 15. The two-way cartridge valve unit one includes a two-way cartridge valve one 10, a cartridge valve cover one 11, and an electromagnetic reversing valve one 12. The two-way cartridge valve unit one and the two-way cartridge valve unit two constitute the oil return passages for the four passive hydraulic cylinders.

[0033] Further, an oil return filter 22 is arranged on the low-pressure pump pipeline. An overflow valve two 21 and a pressure gauge three 25 are connected between the pipeline of the low-pressure pump and the pipeline of the vane pump 5 unit.

[0034] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hydraulic system for an ultra-high pressure filter press, characterized in that, including a hydraulic oil tank; a servo pump system, the servo pump system being in communication with the hydraulic oil tank; both a low-pressure pump and the servo pump system are in communication with a three-position four-way electro-hydraulic reversing valve; the low-pressure pump is connected to a main hydraulic cylinder through the three-position four-way electro-hydraulic reversing valve and is used to push the piston of the main hydraulic cylinder forward in the initial state; the main hydraulic cylinder is in communication with a plurality of passive hydraulic cylinders through a two-way cartridge valve unit one.

2. The ultra-high pressure filter press hydraulic system according to claim 1, characterized in that The servo pump system includes a piston pump unit and a vane pump unit arranged in parallel.

3. The ultra-high pressure filter press hydraulic system according to claim 2, characterized in that, The piston pump unit includes a piston pump and a motor one, the piston pump and the motor one are connected through a new type of plum blossom coupling one, and the piston pump is connected with a proportional valve.

4. The hydraulic system of the ultra-high pressure filter press according to claim 2, characterized in that, The vane pump unit includes a vane pump and a motor two, and the vane pump and the motor two are connected through a new type of plum blossom coupling two.

5. The ultra-high pressure filter press hydraulic system according to claim 2, characterized in that, A pressure gauge one, a pressure transmitter one and a relief valve one are arranged on the pipeline connecting the piston pump unit and the three-position four-way electro-hydraulic reversing valve.

6. The ultra-high pressure filter press hydraulic system according to claim 1, characterized in that, The two-way cartridge valve unit one includes a two-way cartridge valve one, a cartridge valve cover plate one and an electromagnetic reversing valve one.

7. The hydraulic system of the ultra-high pressure filter press according to claim 6, characterized in that, There are four passive hydraulic cylinders, the passive hydraulic cylinders are connected to a two-way cartridge valve unit two, and the two-way cartridge valve unit two includes a two-way cartridge valve two, a cartridge valve cover plate two and an electromagnetic reversing valve two.

8. The high-pressure filter press hydraulic system according to claim 4, wherein An oil return filter is arranged on the pipeline of the low-pressure pump, and a relief valve two and a pressure gauge three are connected between the pipeline of the low-pressure pump and the pipeline of the vane pump unit.

9. The hydraulic system of the ultra-high pressure filter press according to claim 7, characterized in that, The two-way cartridge valve unit one and the two-way cartridge valve unit two constitute an oil return passage at the tail of the four passive hydraulic cylinders.

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