CN2448975Y

CN2448975Y - Autoamtic reversal valve for electric controlled hydraulic actuator

Info

Publication number: CN2448975Y
Application number: CN 00252673
Authority: CN
Inventors: 孙茂钊
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-10-30
Filing date: 2000-10-30
Publication date: 2001-09-19
Anticipated expiration: 2010-10-30

Abstract

The utility model discloses an automatic reversal valve for electrically controlled hydraulic actuating mechanisms, which belongs to a control member of an automatic controlling system. The utility model is characterized in that piston rods 3, 12 are respectively arranged in valve bodies 1, 10, pistons 2, 11 are respectively fixed on the piston rods 3 and 12, and the cavities of the valve bodies 1, 10 are divided into oil chambers by the pistons 2, 11; oil holes 5, 6, 7, 8, 9 are respectively formed on the valve body 1, and oil holes 14, 15, 16, 17, 18 are respectively formed on the valve body 10; the oil hole 5 is communicated with the oil hole 15, the oil hole 6 is communicated with the oil hole 14, the oil hole 8 is communicated with the oil hole 16 and the oil hole 9, and the oil hole 7 is communicated with the oil hole 17 and the oil hole 18; the inner cavities of the valve bodies 1, 10 are provided with springs 4, 13 which cause the piston rods 3, 12 to lean to one end. The utility model has the advantages of self-locking function, low cost, light weight, simple structure, etc.

Description

The automatic diverter valve of electrically controlled and hydraulically actuator

The utility model belongs to a kind of control unit of automatic control system, the automatic diverter valve of particularly a kind of electrically controlled and hydraulically actuator.This device can be connected with electric control unit, motor (comprising stepper motor or actuating motor), double-direction gearpump, oil cylinder and sensor (or position limit switch), forms electrically controlled and hydraulically actuator or systems such as numerical control servo oil cylinder or numerical control hydraulic slide unit.

In the existing electrically controlled and hydraulically actuator system, the oil circuit of double-direction gearpump both sides directly is communicated with the oil circuit of actuator oil cylinder piston both sides, so the motor of driving gear pump can not have the working state of stall, if actuator needs a period of time stop motion, Oil pump electrical machinery also will turn round.Otherwise during the oil pump stall, oil cylinder piston both sides oil circuit communicates, and the position of oil cylinder piston will change with the active force of load, and actuator can not self-locking, the power consumption power consumption, and system is affected working life.In order to solve double-direction gearpump stall self-locking problem, also there is employing that the form that solenoid valve cuts off oil circuit is installed between double-direction gearpump and oil cylinder, but its system needs control electromagnetic valve and motor synchronous work, its complex structure, the cost height, when acting frequently, the solenoid valve life-span is affected, and system's operational reliability is not high.

The purpose of this utility model provide a kind of simple in structure, but cost is low, the automatic diverter valve of the electrically controlled and hydraulically actuator of passive automatic reverse self-locking.

Technical solution of the present utility model is: the automatic diverter valve of a kind of electrically controlled and hydraulically actuator, it is characterized in that: valve body 1, be respectively equipped with piston rod 3 in 10,12, piston rod 3, be fixed with piston 2 on 12 respectively, 11, piston 2,11 with valve body 1,10 inner chamber is separated into the grease chamber, be respectively equipped with oilhole 5 on the

valve body

1,6,7,8,9, be respectively equipped with oilhole 14 on the

valve body

10,15,16,17,18, oilhole 5 is communicated with oilhole 15, oilhole 6 is communicated with oilhole 14, oilhole 8 and oilhole 16, oilhole 9 is communicated with, oilhole 7 and oilhole 17, oilhole 18 is communicated with, at valve body 1,10 inner chambers are provided with and make piston rod 3,12 rely on the spring 4 of an end, 13.

Described oilhole 8 is communicated with oilhole 16, and oilhole 7 is communicated with oilhole 17, and oilhole 9 also can be communicated with atmosphere respectively with oilhole 18.

The utility model compared with prior art has following beneficial effect:

Because this device is provided with the corresponding piston rod that links to each other of two covers, piston and relevant oilhole in valve body, system is in operation process, can be with the needs of actuator, automatic reverse, when if actuator need stop, the stall of control Oil pump electrical machinery, then whole system can reach the state of automatically locking, and makes actuator not be subjected to the influence of load force.Overcome when actuator stops in the prior art shortcoming that Oil pump electrical machinery also will turn round.This device can be widely used in systems such as electrically controlled and hydraulically actuator, numerical control servo oil cylinder, numerical control hydraulic slide unit.Have also that volume is little, in light weight, cost is low, advantages of simple structure and simple.

Below in conjunction with the drawings and the specific embodiments the utility model is further described:

Fig. 1 is the structural representation of the utility model embodiment.

As shown in the figure: 1,10 be respectively valve body.Valve body 1 is provided with inner chamber, is provided with piston rod 3 in the inner chamber, fixedly is connected to two pistons 2 on the piston rod 3.Two pistons 2 are divided into three grease chambeies with the inner chamber of valve body 1.A spring 4 is arranged in the grease chamber, push piston rod 3 to right-hand member, the right-hand member of piston rod 3 is leaned on the sidewall of valve body 1 inner chamber by the elastic force of spring 4.On valve body 1, be provided with oilhole 5, oilhole 6, oilhole 7, oilhole 8, oilhole 9.Under reset condition, spring 4 is pushed piston rod 3 to right-hand member, and oilhole 5, oilhole 6, oilhole 8 are just sealed by piston 2, and oilhole 7 is communicated with the grease chamber of right-hand member, and oilhole 9 is communicated with the left end grease chamber.

Valve body 10 is provided with inner chamber, is provided with piston rod 12 in the inner chamber, fixedly is connected to two pistons 11 on the piston rod 12.Two pistons 11 are divided into three grease chambeies with the inner chamber of valve body 10.A spring 13 is arranged in the grease chamber, push piston rod 12 to left end, the left end of piston rod 12 is leaned on the sidewall of valve body 10 inner chambers by the elastic force of spring 13.On valve body 10, be provided with oilhole 14, oilhole 15, oilhole 16, oilhole 17, oilhole 18.Under reset condition, spring 13 is pushed piston rod 12 to left end, and oilhole 14, oilhole 15, oilhole 17 are just sealed by piston 11, and oilhole 18 is communicated with the grease chamber of right-hand member, and oilhole 16 is communicated with the left end grease chamber.

Oilhole 5 with meet oil cylinder (A) oilhole A2 after oilhole 15 is communicated with, oilhole 6 with meet oil cylinder (A) oilhole A1 after oilhole 14 is communicated with.Oilhole 8 with meet double-direction gearpump (B) oilhole B1 after oilhole 9, oilhole 16 are communicated with, meet two existing gear pump (B) oilhole B2 after oilhole 7, oilhole 17, oilhole 18 are communicated with.

Present embodiment adopts separated structure, and promptly valve body 1, valve body were arranged in 10 minutes, by pipeline each oilhole is communicated with.Can also adopt integrated design, be about to valve body 1, valve body 10 synthetic integral body, oilhole therebetween connects the employing channel mode and connects.

Described oilhole 8 also can be located at valve body 1 when reset condition between two pistons 2, and when promptly piston rod 3 relied on right-hand member, oilhole 8 was communicated with grease chamber between two pistons 2.Described oilhole 17 also can be located at valve body 10 when reset condition between two pistons 11, and when promptly piston rod 12 relied on left end, oilhole 17 was communicated with grease chamber between two pistons 12.

Described spring 4, spring 13 can be stage clip, and the other end that also can change at piston rod 3. piston rods 12 adds extension spring.

Described oilhole B1, B2 are located at respectively on the double-direction gearpump B, and oilhole A1, A2 are located at respectively on the oil cylinder A of actuator.Being provided with piston A3 and piston rod in the oil cylinder A of actuator is output shaft A4.Output shaft A4 meets position transducer or position limit switch C, and its signal is delivered on the electric control unit D, and electric control unit D signal and motor M are joined, and motor M and double-direction gearpump B join.

This device can also be in the following way, and promptly oilhole 8 is communicated with oilhole 16, and oilhole 7 is communicated with oilhole 17, and oilhole 9 is communicated with atmosphere respectively with oilhole 18.

Its working procedure is as follows: be full of under the situation of hydraulic oil in the inner chamber of oil cylinder A, double-direction gearpump B, valve body 1,10, connecting pipeline, when double-direction gearpump B stall, valve body 1,10 is respectively under the effect of spring 4,13, oilhole A1, the A2 of oil cylinder A are separated fully with the oilhole B1 of double-direction gearpump B, the oil circuit that B2 links to each other, it is motionless that the piston A3 of oil cylinder A is locked in when stopping residing position, state as shown in Figure 1.When double-direction gearpump B was just changeing, high pressure oil came out from the oilhole B2 of gear pump B, entered the end face grease chamber that valve body 1 inner chamber does not have the spring side by the oilhole on the valve body 17, formed high-pressure oil chamber.Low pressure oil enters in the pump from gear pump B oilhole B1, by oilhole 9, with the oil body sucking-off of the end face grease chamber of valve body 1 inner chamber spring 4 one sides, forms the low pressure grease chamber.The thrust that acts on piston 2 end faces when high pressure oil is during greater than the elastic force of spring 4, and piston 2 is compressed the direction motion to spring 4, promptly moves to left.Though and the high pressure oil body also enters the grease chamber at valve body 10 inner chamber springs 13 places by oilhole 18, because piston rod 12 no spring one side heads have pushed up on valve body 10 intracavity sidewalls, can not move, keep original state.At this moment oilhole 6 is communicated with oilhole 7, oilhole 8 is communicated with oilhole 5, the oil inlet hole B1 of gear pump B is communicated with the oil outlet A2 of oil cylinder A, and the oil outlet B2 of gear pump B is communicated with the oil inlet hole A1 of oil cylinder A, and the output shaft A4 that reaches control oil cylinder A drives the purpose of load movement.According to the position signal of sensor C, when output shaft need stop, the stall of electric controller D control motor M, gear pump B stops operating, and under the effect of spring 4, piston rod 2 resets, and recovers position shown in Figure 1, and oil cylinder A self-locking is not subjected to the influence of load force.When electric controller control gear pump B when other direction rotates, valve body 1 inner piston rod 3 is failure to actuate, and valve body 10, piston rod 12 will repeat valve body 1, piston rod 3 last course of action, and output shaft A4 is moved round about.

Claims

1, the automatic diverter valve of a kind of electrically controlled and hydraulically actuator, it is characterized in that: valve body (1,10) be respectively equipped with piston rod (3 in, 12), piston rod (3,12) be fixed with piston (2 on respectively, 11), piston (2,11) with valve body (1,10) inner chamber is separated into the grease chamber, valve body is respectively equipped with oilhole (5 on (1), 6,7,8,9), valve body is respectively equipped with oilhole (14 on (10), 15,16,17,18), oilhole (5) is communicated with oilhole (15), oilhole (6) is communicated with oilhole (14), oilhole (8) and oilhole (16), oilhole (9) is communicated with, oilhole (7) and oilhole (17), oilhole (18) is communicated with, at valve body (1,10) inner chamber is provided with and makes piston rod (3,12) rely on the spring (4 of an end, 13).

2, the automatic diverter valve of electric chamber according to claim 1 hydraulic actuator, it is characterized in that: described oilhole (8) is communicated with oilhole (16), and oilhole (7) is communicated with oilhole (17), and oilhole (9) is communicated with atmosphere respectively with oilhole (18).