Two-way pump hydraulic control system

Abstract

The utility model relates to the technical field of hydraulic control systems, in particular to a two-way pump hydraulic control system which comprises an oil cylinder, a motor and a two-way pump, a locking assembly used for locking the oil cylinder is arranged outside the two-way pump, and the locking assembly comprises an injection pipe and a backflow pipe which are arranged at the two ends of the two-way pump. A protection frame is arranged at the front end of the two-way pump, an oil tank is arranged in the protection frame, first one-way valves are arranged at an inlet and an outlet of the oil tank, the injection pipe and the backflow pipe are provided with branch pipes and communicated with the oil tank, and throttlers are arranged on the two branch pipes. Second one-way valves, overflow valves and pressure gauges are sequentially arranged outside the injection pipe and the return pipe, and stop valves are arranged at an oil inlet and an oil outlet of the oil cylinder. The oil cylinder locking device achieves locking when the oil cylinder operates, improves reliability and precision of control, and is simple in structure, advanced in control and high in reliability.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydraulic control system technical field, concretely is a kind of bidirectional pump hydraulic control system. BACKGROUND

[0002] Hydraulic system is a kind of power transmission and control system widely used in industry, automobile and aerospace etc. It utilizes liquid to transfer force and energy, and converts power from one form to another through pressure oil, to achieve the purpose of driving various actuators (such as piston, hydraulic cylinder, motor, etc.). Bidirectional pump control cylinder is a special hydraulic cylinder, its main feature is that it can bear positive and negative load at the same time, and can accurately control the action of hydraulic cylinder.

[0003] But the bidirectional pump hydraulic control cylinder on the market in prior art is running on or off, because there is no throttling device, the valve is in the open state, the cylinder cannot be reliably locked, resulting in low adjustment accuracy. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a kind of bidirectional pump hydraulic control system to solve the problems raised in the above background.

[0005] To achieve the above object, the utility model provides the following technical scheme:

[0006] A kind of bidirectional pump hydraulic control system, including cylinder, motor and bidirectional pump, the bidirectional pump is externally provided with the locking assembly for locking the cylinder, the locking assembly includes injection pipe and backflow pipe arranged at the both ends of bidirectional pump, the front end of bidirectional pump is provided with protection frame, the protection frame is internally provided with oil tank, the inlet and outlet of oil tank are provided with first check valve, the injection pipe and backflow pipe are provided with branch pipe and communicated with oil tank, and throttling device is arranged on the two branch pipes, the injection pipe and backflow pipe are externally sequentially provided with second check valve, overflow valve and pressure gauge, the oil inlet and oil outlet of cylinder are provided with stop valve.

[0007] As the preferred scheme of the utility model, the motor is electrically connected with bidirectional pump, and is electrically connected with the first check valve at the outlet of oil tank, the both ends of injection pipe and backflow pipe are communicated with the oil inlet and oil outlet of cylinder and bidirectional pump by sleeve tube respectively.

[0008] As the preferred scheme of the utility model, the injection pipe and backflow pipe extend into oil tank, and the branch pipe installed with throttling device also extends into oil tank, the two second check valves are respectively installed on injection pipe and backflow pipe by sleeve tube.

[0009] As the preferred scheme of the utility model, the injection pipe and the reflux pipe are externally sequentially penetrated through the overflow valve and the pressure gauge, and are communicated with the overflow valve and the pressure gauge.

[0010] As the preferred scheme of the utility model, the injection pipe and the reflux pipe are externally sequentially penetrated through the overflow valve and the pressure gauge, and are communicated with the overflow valve and the pressure gauge.

[0011] As the preferred scheme of the utility model, the injection pipe and the reflux pipe are externally sequentially penetrated through the overflow valve and the pressure gauge, and are communicated with the overflow valve and the pressure gauge.

[0012] Compared with the prior art, the utility model has the beneficial effects that: aiming at the problems in the background art, the application adopts the lock position assembly, the high-precision control of the rotation speed and the direction is realized through the feedback signal of the cylinder displacement transmitter, and the hydraulic control check valve on the oil pipeline is matched with the throttler, the oil pump motor is driven to lock the oil locking when the cylinder needs to be locked, the oil pump motor is immediately stopped when the displacement transmitter signal indicates that the destination is reached, the hydraulic oil at A1 and B1 is returned to the oil tank through the throttler, the hydraulic control check valve is closed, the cylinder is locked, and the reliability is improved.

[0013] The utility model realizes the lock position of the cylinder during operation, improves the reliability and the precision of the control, has simple structure, advanced control and high reliability. DETAILED DESCRIPTION

[0014] Fig. 1 It is the overall structure perspective view of the utility model;

[0015] Fig. 2 It is the operation system control view of the utility model.

[0016] In the drawing: 1, cylinder; 2, motor; 3, two-way pump; 301, injection pipe; 302, reflux pipe; 4, protection frame; 401, oil tank; 402, first check valve; 5, throttler; 6, second check valve; 7, overflow valve; 8, pressure gauge; 9, stop valve. DETAILED DESCRIPTION

[0017] The technical scheme in the embodiment of the utility model will be clearly and completely described in combination with the embodiment of the utility model. EMBODIMENT

[0018] Please refer to Figs. 1-2The utility model provides a technical scheme: a two -way pump hydraulic control system, including oil cylinder 1, motor 2 and two -way pump 3, the two -way pump 3 outside is provided with the lock -in component for to oil cylinder 1 lock -in, the lock -in component includes the injection pipe 301 and backflow pipe 302 of setting at two -way pump 3 both ends, and injection pipe 301 and backflow pipe 302 can circulate delivery oil before oil cylinder 1 and oil tank 401, the two -way pump 3 front end is provided with protection frame 4, the protection frame 4 is provided with oil tank 401 in, for storing oil, the import and export of oil tank 401 all are provided with first check valve 402, injection pipe 301 and backflow pipe 302 all are provided with branch pipe and with oil tank 401 is open and shut, and two branch pipes all are provided with throttling device 5, injection pipe 301 and backflow pipe 302 all are sequentially provided with second check valve 6, overflow valve 7 and pressure gauge 8, the oil cylinder 1 oil inlet and oil outlet all are provided with stop valve 9, and motor 2 passes through oil cylinder 1 displacement transmitter feedback signal high -precision control rotation speed and direction, two -way pump 3 is external gearing gear pump, minimum rotation speed 200r / min, can be reversed, in the drawing, (A1) is oil outlet (pressure port), then (B1) is oil suction port (low pressure port), and vice versa;

[0019] Two first check valves 402 turn into the valve group of two -way pump 3 configuration, when (A1) is oil outlet, (A1) port pressure opens the first check valve 402 at oil tank 401 export, so that (B1) oil suction port is connected with oil tank 401, and vice versa;

[0020] Second check valve 6 on injection pipe 301 and backflow pipe 302, throttling device 5 are oil cylinder 1 lock -in, when displacement transmitter signal indicates to reach the destination, the motor 2 of two -way pump 3 stops immediately, (A1), (B1) place hydraulic oil is returned to oil tank 401 through throttling device 5, and second check valve 6, oil cylinder 1 lock -in;

[0021] When normal operation, working pressure is 12.75MPa, and the flow loss of passing through throttling device 5 is 0.15L / min;

[0022] When motor 2 oil pump normal work stops, working pressure 16MPa, (A1) or (B1) cavity hydraulic oil is 1L, and the expansion volume of hydraulic oil due to pressure reduction is 0.011L;The flow of passing through throttling device 5 is 0.17L / min, and overflow valve 7 is a non-leakage valve, and the set pressure is 10MPa (adjustable), which limits the output pressure of hydraulic oil cylinder 1, and the two stop valves 9 are usually closed, and are opened by mechanical hand wheel operation.

[0023] All electrical elements in the embodiment are controlled by conventional controllers.

[0024] Embodiment, please refer to Figs. 1-2The motor 2 is electrically connected with the bidirectional pump 3 and the first one-way valve 402 at the outlet of the oil tank 401, the injection pipe 301 and the return pipe 302 are communicated with the oil cylinder 1 and the oil inlet and oil outlet of the bidirectional pump 3 through sleeves respectively, the injection pipe 301 and the return pipe 302 extend into the oil tank 401, and the branch pipe provided with the throttler 5 also extends into the oil tank 401, the two second one-way valves 6 are installed on the injection pipe 301 and the return pipe 302 through sleeves respectively, the injection pipe 301 and the return pipe 302 externally penetrate the overflow valve 7 and the pressure gauge 8 in sequence and are communicated with the overflow valve 7 and the pressure gauge 8, the middle end of the injection pipe 301 and the return pipe 302 is connected with the stop valve 9, the injection pipe 301 and the return pipe 302 are isolated from the oil cylinder 1 through the stop valve 9, the two first one-way valves 402 and second one-way valves 6 are electrically connected with the control end of the oil cylinder 1, and the first one-way valve 402 and the second one-way valve 6 are closed when the control end of the oil cylinder 1 is locked.

[0025] The utility model discloses a work flow: when using, first open (A1) and (B1) switch, pass through the motor 2 simultaneously with the bidirectional pump 3 operation cooperation return pipe 302 and draw out the oil liquid in the oil tank 401 and pass through the bidirectional pump 3 and deliver to the oil cylinder 1 through injection pipe 301 when the oil cylinder 1 drive to the specified position and need to lock, control second one-way valve 6 closes, and the oil liquid in the region close to the bidirectional pump 3 in injection pipe 301 and return pipe 302 flows into the oil tank 401 through throttler 5 and branch pipe, and with the control oil tank (401) outlet first one-way valve 402 closes, realizes to the oil cylinder 1 lock.

[0026] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A hydraulic control system of a bidirectional pump, comprising a cylinder (1), a motor (2) and a bidirectional pump (3), and a locking assembly outside the bidirectional pump (3) for locking the cylinder (1), characterized in that: The locking assembly comprises an injection pipe (301) and a return pipe (302) arranged at both ends of the bidirectional pump (3), the front end of the bidirectional pump (3) is provided with a protection frame (4), the protection frame (4) is internally provided with an oil tank (401), the inlet and outlet of the oil tank (401) are provided with first one-way valves (402), the injection pipe (301) and the return pipe (302) are provided with branch pipes and communicate with the oil tank (401), and the two branch pipes are provided with throttles (5), the injection pipe (301) and the return pipe (302) are externally provided with second one-way valves (6), overflow valves (7) and pressure gauges (8) in sequence, and the oil inlet and outlet of the oil cylinder (1) are provided with stop valves (9).

2. A hydraulic control system for a bi-directional pump according to claim 1, wherein: The motor (2) is electrically connected with the bidirectional pump (3) and the first one-way valve (402) at the outlet of the oil tank (401), and the injection pipe (301) and the return pipe (302) are communicated with the oil inlet and outlet of the oil cylinder (1) and the bidirectional pump (3) through the sleeves at both ends.

3. The hydraulic control system for a bi-directional pump according to claim 1, wherein: The injection pipe (301) and the return pipe (302) extend into the oil tank (401), and the branch pipes provided with the throttles (5) also extend into the oil tank (401), and the two second one-way valves (6) are mounted on the injection pipe (301) and the return pipe (302) through the sleeves.

4. The hydraulic control system for a bi-directional pump of claim 1, wherein: The injection pipe (301) and the return pipe (302) externally penetrate the overflow valves (7) and the pressure gauges (8) in sequence and communicate with the overflow valves (7) and the pressure gauges (8).

5. The hydraulic control system for a bi-directional pump of claim 1, wherein: The middle ends of the injection pipe (301) and the return pipe (302) are connected with the stop valves (9), and the injection pipe (301) and the return pipe (302) are isolated from the oil cylinder (1) through the stop valves (9).

6. A hydraulic control system for a bi-directional pump according to claim 1, wherein: The two first one-way valves (402) and the second one-way valves (6) are electrically connected with the control end of the oil cylinder (1), and the first one-way valves (402) and the second one-way valves (6) are closed when the locking control of the control end of the oil cylinder (1) is controlled.

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