An electro-hydraulic quick-break valve

Abstract

An electro-hydraulic quick-cut valve includes an armature, a coil, a control valve core, a valve body, a main valve core, a small spring, a large spring, a conical seat, a return oil tank, a gland, a lock nut, and a conical core. The main valve core has an inner conical hole at its left end, an annular groove on its outer column, and a small hole drilled on its right end face communicating with the annular groove. The control valve core has symmetrically axially oriented through grooves on its outer column in the middle, and a cone-shaped part adapted to the inner conical hole of the main valve core is located at the left end of the middle part of the control valve core. The conical seat has a conical hole adapted to the conical core at its center, and the conical core is mounted on the stepped shaft on the left side of the control valve core and fixed by the lock nut. When an emergency oil circuit needs to be cut off, the main valve core is driven by both hydraulic pressure and electromagnetic force, resulting in a rapid cutting-off speed.

Description

Technical Field

[0001] This invention relates to an electro-hydraulic quick-break valve. Background Technology

[0002] In a hydraulic system, the electromagnetic force of the electro-hydraulic directional valve generally does not act on the main valve core. When it is necessary to cut off the oil circuit in an emergency, the main valve core can only be driven by hydraulic pressure. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention provides an electro-hydraulic quick-cut valve, in which the main valve core is driven by both hydraulic pressure and electromagnetic force when an emergency cut-off of the oil circuit is required, resulting in a faster cut-off speed.

[0004] The technical solution adopted by this invention to solve its technical problem is as follows: The designed electro-hydraulic quick-cut valve includes an armature, a coil, a control valve core, a valve body, a main valve core, a small spring, a large spring, a conical seat, a return oil tank, a pressure cap, a lock nut, and a conical core. The main valve core slides with the valve body. The left end of the main valve core has an inner conical hole, and the outer column of the main valve core has an annular groove. A small hole communicating with the annular groove is drilled on the right end face of the main valve core. A through groove is symmetrically opened along the axial direction on the outer column in the middle of the control valve core. The left end of the middle section is provided with a cone that matches the conical hole inside the main valve core. The cone core is mounted on the stepped shaft on the left side of the control valve core and is fixed by a lock nut. The cone hole seat is fixedly installed on the left side of the valve body. The center of the cone hole seat is provided with a cone hole that matches the cone core. The two ends of the small spring are respectively supported on the cone hole seat and the left end of the middle section of the control valve core. The two ends of the large spring are respectively supported on the cone hole seat and the left end of the main valve core. The right side of the valve body has symmetrical oil inlet and oil outlet ports. The left cavity of the valve body is connected to the return oil tank.

[0005] The valve body left cavity communicating with the return oil tank as described in this technical solution can be provided with a through hole on the end face of the gland, which communicates with the return oil tank.

[0006] The working principle of this invention is as follows: When the main valve core is located at the right end, the oil inlet and outlet ports on the valve body are connected through the annular groove on the outer column of the main valve core. At this time, the conical hole at the center of the conical seat is closed, and the inner conical hole of the main valve core is open. When it is necessary to quickly cut off the oil inlet and outlet ports on the valve body, the coil is energized and applies a leftward electromagnetic force to the armature, causing the control valve core to move to the left, thereby closing the inner conical hole of the main valve core and opening the conical hole at the center of the conical seat, creating a pressure difference between the two ends of the main valve core. In this way, the main valve core moves rapidly to the right under the combined push of electromagnetic and hydraulic forces, cutting off the oil circuit. When it is necessary to connect the oil circuit, the coil is de-energized, and the small spring pushes the control valve core to the left, opening the inner conical hole of the main valve core and closing the conical hole at the center of the conical seat, causing the pressure difference between the two ends of the main valve core to disappear. In this way, the main valve core moves to the right end under the action of the large spring, connecting the oil inlet and outlet ports.

[0007] The beneficial effect of this invention is that the oil circuit can be cut off relatively quickly. Attached Figure Description

[0008] Figure 1 This is the front view of the present invention.

[0009] Figure 2 yes Figure 1 AA view.

[0010] In the diagram: 1. Armature, 2. Coil, 3. Control valve core, 4. Valve body, 5. Main valve core, 6. Small spring, 7. Large spring, 8. Tapered hole seat, 9. Return oil tank, 10. Pressure cap, 11. Locking nut, 12. Tapered core. Detailed Implementation

[0011] from Figure 1 and Figure 2 As can be seen from the figure, an electro-hydraulic quick-cut valve according to an embodiment of the present invention includes an armature 1, a coil 2, a control valve core 3, a valve body 4, a main valve core 5, a small spring 6, a large spring 7, a conical seat 8, a return oil tank 9, a pressure cap 10, a locking nut 11, and a conical core 12. The main valve core 5 is slidably fitted with the valve body 4. The left end of the main valve core 5 is provided with an inner conical hole, and the outer column of the main valve core 5 is provided with an annular groove. A small hole communicating with the annular groove is drilled on the right end face of the main valve core 5. The outer column of the middle part of the control valve core 3 is symmetrically provided with through grooves along the axial direction, and the left end of the middle part of the control valve core 3 is provided with a cone body adapted to the inner conical hole of the main valve core 5. The conical core 12 is assembled on the stepped shaft of the left part of the control valve core 3 and is fixed by the locking nut 11. The conical seat 8 is fixedly installed on the left part of the valve body 4, and the center of the conical seat 8 is provided with a conical hole adapted to the conical core 12. The two ends of the small spring 6 are supported on the cone seat 8 and the left end of the control valve core 3, respectively. The two ends of the large spring 7 are supported on the cone seat 8 and the left end of the main valve core 5, respectively. The valve body 4 has symmetrically arranged oil inlet and outlet ports on its right side, and the left cavity of the valve body 4 is connected to the return oil tank 9. When the coil 2 is not energized, the main valve core 5 is located at the right end, and the oil inlet and outlet ports on the valve body 4 are connected through the annular groove on the outer column of the main valve core 5. At this time, the cone hole in the center of the cone seat 8 is closed, and the inner cone hole of the main valve core 5 is open. When it is necessary to quickly cut off the oil inlet and outlet ports on the valve body 4, the coil 2 is energized and applies a leftward electromagnetic force to the armature 1, causing the control valve core 3 to move to the left, thereby closing the inner cone hole of the main valve core 5 and opening the cone hole in the center of the cone seat 8, creating a pressure difference between the two ends of the main valve core 5. Thus, the main valve core 5 moves rapidly to the left under the combined force of electromagnetic and hydraulic forces, cutting off the oil circuit. When the oil circuit needs to be connected, coil 2 is de-energized, and small spring 6 pushes control valve core 3 to the right, opening the inner conical hole of main valve core 5 and closing the conical hole in the center of conical hole seat 8, thus eliminating the pressure difference between the two ends of main valve core 5. In this way, main valve core 5 moves to the right end under the action of large spring 7, connecting the oil inlet and outlet ports.

Claims

1. An electro-hydraulic quick-closing valve, comprising an armature, a coil, a control valve core, a valve body, a main valve core, a small spring, a large spring, a conical seat, a return oil tank, a pressure cap, a lock nut, and a conical core, characterized in that: The main valve core slides with the valve body. The left end of the main valve core has an inner conical hole, and the outer column of the main valve core has an annular groove. A small hole connected to the annular groove is drilled on the right end face of the main valve core. A chamber connected to the small hole is located on the right end of the main valve core. A through groove is symmetrically opened axially on the outer column of the middle part of the control valve core. A cone-shaped part adapted to the inner conical hole of the main valve core is located on the left end of the middle part of the control valve core. The cone-shaped part is mounted on the stepped shaft on the left side of the control valve core and fixed by a lock nut. A conical hole seat is fixedly installed on the left side of the valve body. A conical hole adapted to the cone-shaped part is located in the center of the conical hole seat. The two ends of a small spring are supported on the conical hole seat and the left end of the middle part of the control valve core, respectively. The two ends of a large spring are supported on the conical hole seat and the left end of the main valve core, respectively. An oil inlet and an oil outlet are symmetrically opened on the right side of the valve body. A left cavity of the valve body is located on the left end of the conical hole seat. The cone-shaped part is located inside the left cavity of the valve body. The left cavity of the valve body is connected to the return oil tank. When the coil is not energized, the main... The valve core is located at the right end. The inlet and outlet ports on the valve body are connected through the annular groove on the outer column of the main valve core. At this time, the conical hole in the center of the conical seat is closed, and the inner conical hole of the main valve core is open. When it is necessary to quickly cut off the inlet and outlet ports on the valve body, the coil is energized and applies an electromagnetic force to the armature to the left, causing the control valve core to move to the left, thereby closing the inner conical hole of the main valve core and opening the conical hole in the center of the conical seat, creating a pressure difference between the two ends of the main valve core. Thus, the main valve core moves rapidly to the left under the combined push of electromagnetic and hydraulic forces. The annular groove on the outer column of the main valve core is disconnected from the inlet and outlet ports on the valve body, thereby cutting off the oil circuit. When it is necessary to connect the oil circuit, the coil is de-energized, and the small spring pushes the control valve core to the right, opening the inner conical hole of the main valve core and closing the conical hole in the center of the conical seat, causing the pressure difference between the two ends of the main valve core to disappear. Thus, the main valve core moves to the right end under the action of the large spring, connecting the inlet and outlet ports.

2. The electro-hydraulic quick-stop valve according to claim 1, characterized in that: The end face of the gland is provided with a through hole, through which the left cavity of the valve body communicates with the return oil tank.

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