Electro-hydraulic driver

Abstract

The utility model discloses an electro-hydraulic driver which comprises a valve block body. The conveying device is arranged in the inner accommodating cavity of the valve block main body; the driving device is arranged on the valve block main body and is used for driving the conveying device; one end of the compensation oil tank is connected with the conveying device; the conveying device is arranged on the valve block main body, the cartridge valve device is arranged on the valve block main body, the number of the cartridge valve device is at least one, and the cartridge valve device is connected with the conveying device; the oil cylinder is fixedly arranged on the valve block body, one end of the oil cylinder is connected with the cartridge valve, the design that the cartridge valve device and the valve block body are combined is adopted, oil pipe connection is not needed any more, the structure is more compact, and the size of the valve block is reduced; and the length of an oil path is shortened, so that the loss of on-way energy caused by the overlong oil path is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of drive systems, and particularly relates to an electro-hydraulic actuator. Background Art

[0002] With the development of industrial technology, the use of hydraulic presses has become widespread. Traditional hydraulic presses generally use a hydraulic station as the drive, connected by oil pipes. The overall system is an open system. It not only requires a large amount of hydraulic oil for operation, but also causes large energy losses due to the long oil path, accompanied by relatively large noise, insensitive commutation, and has the disadvantages of large volume and high weight, severely limiting the scope of use.

[0003] For the above reasons, it is necessary to improve the existing technology. Summary of the Utility Model

[0004] I. Technical Problems to be Solved

[0005] The utility model aims at the above-mentioned defects existing in the prior art, and particularly provides an electro-hydraulic actuator to solve the problems raised in the above background art. Technical Solution

[0006] To solve the above technical problems, the utility model provides an electro-hydraulic actuator, including a valve block body;

[0007] A conveying device, which is arranged in the internal cavity of the valve block body;

[0008] A driving device, which is arranged on the valve block body and is used to drive the conveying device;

[0009] A compensation oil tank, one end of which is connected to the conveying device;

[0010] A cartridge valve device, which is arranged on the valve block body and at least one is provided. The cartridge valve device is connected to the conveying device;

[0011] An oil cylinder, which is fixedly arranged on the valve block body and one end of which is connected to the cartridge valve.

[0012] In the above technical solution, the conveying device is a two-way pump.

[0013] In the above technical solution, the driving device is a servo motor.

[0014] In the above technical solution, the oil cylinder includes a cylinder barrel and a valve rod movably arranged in the internal cavity of the cylinder barrel. The shape of the cylinder barrel is square.

[0015] In the above technical solution, the cartridge valve device includes a first solenoid valve, a second solenoid valve, and a third solenoid valve. The valve stem can telescopically extend out of the cylinder barrel. When the valve stem needs to extend, the first solenoid valve is turned on, and the second solenoid valve and the third solenoid valve are cut off. The hydraulic oil flows out from the conveying device and flows to the bottom of the oil cylinder through the first solenoid valve. After the hydraulic oil pushes the valve stem to extend, it flows back to the conveying device through a through hole on the valve stem.

[0016] When the valve stem needs to retract, the first solenoid valve is cut off, and the second solenoid valve and the third solenoid valve are turned on. The hydraulic oil flows out from the conveying device and flows to the top of the oil cylinder through the second solenoid valve. After the hydraulic oil pushes the valve stem to retract, it flows back to the conveying device through the third solenoid valve.

[0017] Beneficial effects

[0018] Compared with the prior art, the present utility model has the following beneficial effects: The design of combining the cartridge valve device and the valve block body enables this patent not to require the use of oil pipes for connection. This not only makes the structure more compact and reduces the volume of this patent, but also shortens the length of the oil circuit, thereby reducing the loss of along - the - way energy caused by the overly long oil circuit. Description of the drawings

[0019] Figure 1 is a three - dimensional structural schematic diagram of the present utility model.

[0020] Figure 2 is a schematic diagram of the oil - circuit principle of the present utility model.

[0021] In the figure: 1 is the valve block body, 2 is the conveying device, 3 is the driving device, 4 is the compensation oil tank, 5 is the cartridge valve device, 6 is the oil cylinder, 50 is the first solenoid valve, 52 is the second solenoid valve, 53 is the third solenoid valve, 60 is the cylinder barrel, and 61 is the valve stem. Specific embodiments

[0022] The following combines the drawings and embodiments to further describe in detail the specific embodiments of the present utility model. The following embodiments are used to illustrate the present utility model, but cannot be used to limit the scope of the present utility model.

[0023] Please refer to Figure 1-2 , the present utility model provides a electro - hydraulic driver, including a valve block body 1;

[0024] a conveying device 2, the conveying device 2 is arranged in the internal cavity of the valve block body 1;

[0025] a driving device 3, the driving device 3 is arranged on the valve block body 1 and is used to drive the conveying device 2;

[0026] A compensating oil tank 4, one end of the compensating oil tank 4 is connected to the conveying device 2;

[0027] A cartridge valve device 5, the cartridge valve device 5 is arranged on the valve block body 1, and at least one is provided, the cartridge valve device 5 is connected to the conveying device 2;

[0028] An oil cylinder 6, the oil cylinder 6 is fixedly arranged on the valve block body 1, and one end is connected to the cartridge valve device 5.

[0029] In the above structure, directly connecting the cartridge valve device to the conveying device can make the structure more compact, no longer need to use oil pipes to convey oil, reduce the volume of the overall product while shortening the length of the oil circuit, thereby reducing the frictional energy loss.

[0030] Specifically, the conveying device 2 is a two-way pump. Using a two-way pump to replace the traditional one-way pump no longer requires a reversing valve. The two-way pump has reversibility compared with the traditional one-way pump, and can complete the same work with less power consumption. The overall energy-saving effect is better and more efficient.

[0031] Specifically, the driving device 3 is a servo motor. The servo motor runs stably as a whole, has high precision and good timeliness, and the dynamic response time of the motor during acceleration and deceleration is short.

[0032] Specifically, the oil cylinder 6 includes a cylinder barrel 60 and a valve rod 61 movably arranged in the inner cavity of the cylinder barrel 60. The cylinder barrel 60 is square in shape, and the square structure has higher strength and better stability.

[0033] Specifically, the cartridge valve device 5 includes a first solenoid valve 50, a second solenoid valve 51 and a third solenoid valve 52. The valve rod 61 can extend outwards from the cylinder barrel 60. When the valve rod 61 needs to extend, the first solenoid valve 50 is turned on, the second solenoid valve 51 and the third solenoid valve 52 are turned off, the oil flows out from the conveying device 2, and flows to the bottom of the oil cylinder 6 through the first solenoid valve 50. After the oil pushes the valve rod 61 to extend, it flows back to the conveying device 2 through a through hole on the valve rod 61;

[0034] When the valve rod 61 needs to retract, the first solenoid valve 50 is turned off, the second solenoid valve 51 and the third solenoid valve 52 are turned on, the oil flows out from the conveying device 2, and flows to the top of the oil cylinder 6 through the second solenoid valve 51. After the oil pushes the valve rod 61 to retract, it flows back to the conveying device 2 through the third solenoid valve 52. By turning off and on the first solenoid valve, the second solenoid valve and the third solenoid valve to change the flow path of the oil, the extension and retraction of the valve rod in the oil cylinder can be achieved in this way.

[0035] The above are only the preferred embodiments of the present utility model. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present utility model, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present utility model.

Claims

1. An electro-hydraulic actuator, characterized in that, Including: Valve block body (1); Delivery device (2), which is arranged in the internal cavity of the valve block body (1); Drive device (3), which is arranged on the valve block body (1) and is used to drive the delivery device (2); Compensation oil tank (4), one end of which is connected to the delivery device (2); Cartridge valve device (5), which is arranged on the valve block body (1) and at least one is provided, and the cartridge valve device (5) is connected to the delivery device (2); Oil cylinder (6), which is fixedly arranged on the valve block body (1) and one end of which is connected to the cartridge valve device (5).

2. The electro-hydraulic driver according to claim 1, characterized in that: The delivery device (2) is a two-way pump.

3. The electro-hydraulic driver according to claim 1, characterized in that: The drive device (3) is a servo motor.

4. The electro-hydraulic driver according to claim 1, characterized in that: The oil cylinder (6) includes a cylinder barrel (60) and a valve rod (61) movably arranged in the internal cavity of the cylinder barrel (60), and the shape of the cylinder barrel (60) is square.

5. The electro-hydraulic driver according to claim 4, characterized in that: The cartridge valve device (5) includes a first solenoid valve (50), a second solenoid valve (51) and a third solenoid valve (52). The valve rod (61) can extend outwards from the cylinder barrel (60). When the valve rod (61) needs to extend, the first solenoid valve (50) is turned on, and the second solenoid valve (51) and the third solenoid valve (52) are cut off. The oil fluid flows out from the delivery device (2) and flows to the bottom of the oil cylinder (6) through the first solenoid valve (50). After the oil fluid pushes the valve rod (61) to extend, it flows back to the delivery device (2) through a through hole on the valve rod (61); When the valve rod (61) needs to retract, the first solenoid valve (50) is cut off, and the second solenoid valve (51) and the third solenoid valve (52) are turned on. The oil fluid flows out from the delivery device (2) and flows to the top of the oil cylinder (6) through the second solenoid valve (51). After the oil fluid pushes the valve rod (61) to retract, it flows back to the delivery device (2) through the third solenoid valve (52).

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