Hydraulic system for plate filter

Abstract

The utility model discloses a hydraulic system for a plate filter, relates to the technical field of hydraulic pressure of plate filters, and is used for solving the problems that when oil in a rodless cavity leaks into a rod cavity, the system cannot detect, so that the thrust of a piston rod is reduced, the requirements of working conditions cannot be met, and the impact force is large during reversing of an electromagnetic valve. An AB double-cavity hydraulic lock is changed into an A-port single-cavity hydraulic lock, a B-port balance valve is added, when the piston rod reciprocates up and down, the piston rod can stop moving at any time even if the piston rod has the gravity of 4 tons, the piston rod cannot fall off, meanwhile, due to the unique characteristic of the balance valve, impact force is greatly weakened during reversing of the electromagnetic valve, the requirements of working conditions are met, and the service life of the electromagnetic valve is prolonged. Under the working condition requirement of long-term pressure maintaining, even if the sealing ring of the hydraulic cylinder is damaged and internal leakage occurs, the internal leakage can be detected by the pressure gauge; and the thrust of the piston rod of the system in a pressure maintaining state is real and effective.

Description

TECHNICAL FIELD

[0001] The utility model relates to plate filter hydraulic technology field, concretely is a kind of hydraulic system for plate filter. BACKGROUND

[0002] The conventional hydraulic system components are: motor, oil pump, check valve, overflow valve, solenoid valve reversing valve, throttle valve, hydraulic lock, hydraulic cylinder, etc.;

[0003] For the hydraulic system of plate filter, its feature is that hydraulic cylinder is vertically installed, piston rod is downward, there is 2-4 tons of workpiece weight at the end of piston rod, and it reciprocates up and down, and it is required to stop at any time and not to fall during movement, and it is required to have more than 50 tons of force to resist and long-term pressure when pressing workpiece (i.e. it is required to long-term pressure in rod cavity), and it is required to reduce impact force when solenoid reversing valve reverses, and the system will automatically compensate pressure when under-pressure is found.

[0004] For the above working condition requirements, the current market practice is to use J-shaped three-position four-way solenoid valve reversing valve and AB double-cavity hydraulic lock to realize this function, but the disadvantage of this configuration is that when rod cavity oil leaks into rod cavity, the system cannot be detected, which reduces the thrust of piston rod, and cannot meet the requirements of working condition, and the impact force is large when solenoid valve reverses, and the above problems are solved.

[0005] Therefore, we propose a hydraulic system for plate filter. CONTENT OF UTILITY MODEL

[0006] The utility model aims to provide a hydraulic system for plate filter to solve the problems raised in the background art.

[0007] To achieve the above purpose, the utility model provides the following technical scheme: a hydraulic system for plate filter, comprising oil tank, oil suction filter, plunger pump, overflow valve, oil return filter solenoid reversing valve, hydraulic lock, superimposed balance valve, superimposed check throttle valve and oil cylinder, the oil tank provides hydraulic oil for the whole system, the liquid inlet end of the oil suction filter is communicated with the oil tank, and the liquid outlet end is connected with the plunger pump. The liquid inlet end of the plunger pump is communicated with the liquid outlet end of the oil suction filter, and the liquid outlet end is connected with the overflow valve and the solenoid reversing valve. The liquid inlet end of the overflow valve is communicated with the liquid outlet end of the plunger pump, and the liquid outlet end is communicated with the oil return filter and the solenoid reversing valve. The liquid inlet end of the oil return filter is communicated with the overflow valve, and the liquid outlet end is communicated with the oil tank. The liquid inlet end of the hydraulic lock is communicated with the solenoid reversing valve, and the liquid outlet end is connected with the superimposed balance valve. The liquid inlet end of the superimposed check throttle valve is communicated with the superimposed balance valve, and the liquid outlet end is connected with the oil cylinder; one side of the oil cylinder is provided with a filter box.

[0008] Further, the electromagnetic reversing valve is provided with a one-way valve on the pipeline of the outlet end of the plunger pump.

[0009] Further, the one-way valve and the electromagnetic reversing valve further extend a branch, the branch is provided with a pressure measuring connector, and the pressure measuring connector is provided with a pressure gauge.

[0010] Further, the overflow valve further extends a branch, and the branch is connected with the two electromagnetic reversing valves.

[0011] Further, the two outlet ends of the superimposed one-way throttle valve are connected with the two corresponding oil cylinders respectively, and the pipeline of one outlet end further extends a branch, the branch is provided with a pressure measuring connector, and the pressure measuring connector is provided with a pressure relay.

[0012] Compared with the prior art, the utility model has the beneficial effects that:

[0013] By changing the AB double-cavity hydraulic lock into an A-port single-cavity hydraulic lock and adding a B-port balance valve, the following problems are solved:

[0014] 1. When the piston rod reciprocates up and down, even if there is a gravity of 4 tons, the piston rod can be stopped at any time and will not fall;

[0015] 2. The unique feature of the balance valve greatly reduces the impact force when the electromagnetic valve reverses, meeting the requirements of the working condition;

[0016] 3. Under the working condition of long-term pressure maintenance, even if the hydraulic cylinder sealing ring is damaged and there is internal leakage, it can be detected from the pressure gauge, ensuring that the piston rod thrust is real and effective under the pressure maintenance state of the system;

[0017] 4. When the hydraulic system fails, the operator can immediately identify the problem, which helps to improve the hydraulic system and greatly improves the stability of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The utility model is used for the hydraulic system principle diagram of a plate filter.

[0019] In the figure: 1, oil tank; 2, liquid level meter; 3, air filter; 4, plunger pump; 5, motor; 6, oil suction filter; 7, overflow valve; 8, oil return filter; 9, one-way valve; 10, electromagnetic reversing valve; 11, hydraulic lock; 12, superimposed balance valve; 13, superimposed one-way throttle valve; 14, pressure measuring connector; 15, pressure gauge; 16, pressure relay; 17, oil cylinder; 18, filter box. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0021] Please refer to Figure 1 The utility model provides a kind of technical scheme:

[0022] The utility model provides a kind of hydraulic system for plate filter, adopts split design, including oil tank 1, oil suction filter 6, plunger pump 4, overflow valve 7, oil return filter 8 electromagnetic reversing valve 10, hydraulic lock 11, superimposed balance valve 12, superimposed check valve 13 and oil cylinder 17, overall layout is reasonable, wiring is neat, and it is convenient to maintain;

[0023] Oil tank 1 provides hydraulic oil for the whole system, wherein, adopt Mobil No. 46 hydraulic oil, provide excellent antioxidant property;

[0024] Hydraulic oil is driven by plunger pump 4 of motor 5, starts from oil suction filter 6 of oil tank 1 into pipeline, one side of plunger pump 4's liquid outlet branch is equipped with check valve 9, the other side is equipped with overflow valve 7, when system pressure rises to the set pressure of overflow valve 7, valve port opens, makes redundant oil flow back to oil tank 1, to ensure that system pressure is maintained around set value, and oil return filter 8 is also installed on return tank pipeline, and oil return purification operation is carried out;

[0025] And the hydraulic oil passing through check valve 9 enters into two side electromagnetic reversing valve 10, electromagnetic reversing valve 10 is mainly composed of valve body, valve core, electromagnetic coil, spring and other parts, there are multiple oil ports on valve body, for connecting different pipelines, to make fluid enter or flow out, valve core can move in valve body, and its position determines the flow direction of fluid, electromagnetic coil is used to generate electromagnetic force, drives valve core to move, and the action of spring is to reset valve core when electromagnetic force disappears;

[0026] Oil flowing out of electromagnetic reversing valve 10 enters hydraulic lock 11, and the whole hydraulic lock 11 is mainly composed of valve body, valve core, control piston and spring and other components, there are oil inlet, oil outlet and control oil port on valve body, valve core can prevent oil reverse flow under normal circumstances, similar to ordinary check valve 9, control piston is used to open valve core to overcome spring force when control pressure is applied, to realize reverse conduction, and the liquid outlet end of hydraulic lock 11 is connected with superimposed balance valve 12, the size of throttling port is adjusted to control flow, to realize the control of the movement speed of execution element, and simultaneously, it can also prevent load from uncontrolled sliding due to gravity and other factors by using the balance relationship of hydraulic pressure and spring force.

[0027] By changing the AB double-cavity hydraulic lock 11 into an A-port single-cavity hydraulic lock 11, and adding a B-port balance valve, even if there is a 4-ton gravity, the piston rod can be stopped at any time and will not fall during the up-and-down reciprocating movement of the piston rod;

[0028] The superimposed one-way throttling valve 13 is a combined hydraulic element which combines the functions of the one-way valve 9 and the throttling valve, and is connected with the oil cylinder 17 on both sides to control the movement of the piston rod in the oil cylinder 17, and is connected with the filter tank 18 on the side of the oil cylinder 17, and the pressure tap 14 is arranged on the connecting pipeline, and the pressure relay 16 is arranged on the pressure tap 14, when the pressure in the hydraulic system reaches the set pressure of the pressure relay 16, the pressure acts on the elastic element to make the elastic element deform, and the deformation triggers the microswitch through the mechanical transmission mechanism to generate an electric signal, and the pipeline on the side of the one-way valve 9 is also provided with the pressure tap 14, and the pressure gauge 15 is arranged on the pressure tap 14, and even if the inner leakage occurs due to the damage of the sealing ring of the hydraulic cylinder under the long-term pressure maintaining working condition, the damage can be detected from the pressure gauge 15, and the real and effective thrust of the piston rod in the pressure maintaining state of the system is ensured;

[0029] The air filter 3 and the liquid level gauge 2 are arranged on the oil tank 1, the filtering element in the air filter 3 uses the physical interception, adsorption and other actions to leave the impurity particles in the air on the surface or inside of the filtering element to prevent the pollution of the hydraulic oil.

[0030] The above content is only an example and description of the structure of the utility model, and the skilled person in the art can make various modifications or supplements or use similar ways to replace the described specific embodiments, as long as the modifications or supplements or replacements do not deviate from the structure of the utility model or exceed the range defined in the claims, and the modifications or supplements or replacements belong to the protection range of the utility model.

[0031] In the description of the present specification, the description of the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are contained in at least one embodiment or example of the utility model. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0032] The preferred embodiments disclosed above are only used to help describe the utility model. The preferred embodiments do not describe all the details and do not limit the utility model to the specific implementation. Obviously, according to the content of the specification, many modifications and changes can be made. The specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the utility model, so that the person skilled in the art can well understand and utilize the utility model. The utility model is limited by the claims and the whole scope and equivalents thereof.

Claims

1. A hydraulic system for a plate filter press, characterized in that, include: tank; A level gauge is installed on the outside of the oil tank, an air filter is installed on one side of the top of the oil tank, and an oil suction filter is installed inside the oil tank. A plunger pump, the inlet of which is connected to the outlet of the oil suction filter, and the outlet is connected to an overflow valve and a solenoid directional valve; an electric motor is installed on one side of the plunger pump. The return oil filter has its inlet end connected to the outlet end of the overflow valve and its outlet end connected to the oil tank. The hydraulic lock has its inlet end connected to a solenoid directional valve and its outlet end connected to a stacked balance valve. A stacked one-way throttle valve has its inlet end connected to the stacked balance valve, and its outlet end connected to a hydraulic cylinder; a filter box is installed on one side of the hydraulic cylinder.

2. The hydraulic system for a plate filter according to claim 1, characterized in that: A check valve is installed on the electromagnetic reversing valve and the liquid outlet pipeline of the plunger pump.

3. The hydraulic system for a plate filter according to claim 2, characterized in that: The one-way valve and the solenoid directional valve also extend into a branch, on which a pressure testing connector is installed, and a pressure gauge is installed on the pressure testing connector.

4. A hydraulic system for a plate filter according to claim 3, characterized in that: The overflow valve also extends into a branch, the end of which is connected to the electromagnetic directional valves on both sides.

5. A hydraulic system for a plate filter according to claim 4, characterized in that: The two outlets of the superimposed one-way throttle valve are respectively connected to the two sides of the oil cylinder, and a branch extends from the pipeline of one outlet, with a pressure test connector installed on the branch and a pressure relay installed on the pressure test connector.

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