CN115823293A

CN115823293A - Improved buffering type electro-hydraulic reversing valve

Info

Publication number: CN115823293A
Application number: CN202211736545.XA
Authority: CN
Inventors: 谢丽; 陈俊成
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-12-31
Filing date: 2022-12-31
Publication date: 2023-03-21

Abstract

The invention discloses an improved buffer type electro-hydraulic reversing valve which comprises an electro-hydraulic reversing valve and a hydraulic control reversing valve, wherein a first coil and a second coil are respectively arranged at the left end and the right end inside the electro-hydraulic reversing valve, a second valve core is arranged on one side of the first coil, a component B1 is arranged at the bottom end of the second valve core, a B1 hole is formed in the bottom end of the component B1, a component P1 is arranged on one side of the component B1, a component A1 is arranged on one side of the component P1, A1 hole is formed in the bottom end of the component A1, a component T1 is arranged on one side of the component A1, a2 hole is connected to the bottom end of the A1 hole, an a3 hole is connected to one end of the A1 hole, a B3 hole is connected to one end of the B1 hole, an R cavity is formed in the bottom side of the B3 hole, and the first valve core is arranged on one side of the R cavity. The hydraulic control reversing valve controls the oil quantity to move along with the first valve core, and the oil quantity for controlling the first valve core can be gradually increased from small to large, so that the effects of slow starting and gradual acceleration are achieved in the movement of the oil cylinder.

Description

Improved buffering type electro-hydraulic reversing valve

Technical Field

The invention relates to the field of electromagnetic reversing valves, in particular to an improved buffer type electro-hydraulic reversing valve.

Background

The electro-hydraulic directional valve is a hydraulic directional valve which is combined with an electromagnetic pilot valve into a whole. The valve core is pushed by pressure oil in the control oil way. The electro-hydraulic reversing valve and the hydraulic control reversing valve are mainly used in a hydraulic system with the flow rate exceeding the normal working allowable range of the electromagnetic reversing valve, and are used for controlling the action of an executing element or controlling the flowing direction of oil.

The existing hydraulic control reversing valve only can enable the oil cylinder to move at a fixed speed, the oil cylinder with large control oil flow is too fast and too violent, and the oil cylinder with small control oil flow is stable but the residual stroke of the valve core switching process is slow, so that the production efficiency is not high.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides an improved buffer type electro-hydraulic reversing valve.

In order to solve the technical problems, the invention provides the following technical scheme:

the invention relates to an improved buffer type electro-hydraulic directional valve which comprises an electromagnetic directional valve and a hydraulic control directional valve, wherein a first coil and a second coil are respectively arranged at the left end and the right end in the electromagnetic directional valve, a second valve core is arranged at one side of the first coil, a component B1 is arranged at the bottom end of the second valve core, a B1 hole is formed in the bottom end of the component B1, a component P1 is arranged at one side of the component B1, a component A1 is arranged at one side of the component P1, a hole A1 is formed in the bottom end of the component A1, a component T1 is arranged at one side of the component A1, damping screw plugs are arranged at the top ends of the hole A1 and the hole B1, a hole a2 is connected to the bottom end of the hole A1, a hole a3 is connected to one end of the hole B1, a hole B2 is connected to the bottom end of the hole B1, return springs are arranged at the bottom ends of the hole B3 and a return spring is arranged at the bottom side of the hole B3, and a first valve core is arranged at one side of the R cavity.

In a preferred embodiment of the present invention, the component A1, the component B1, the component P1, and the component T1 are process holes, and the component A1 communicates with the hole A1, and communicates with the hole a2 and the hole a3 through the hole A1.

As a preferable technical scheme of the invention, the hydraulic control reversing valve is internally symmetrically arranged, and a1 hole, a2 hole and a3 hole of the hydraulic control reversing valve are symmetrical to a b1 hole, a b2 hole and a b3 hole of the hydraulic control reversing valve.

In a preferred embodiment of the present invention, a sliding groove is provided between the first coil and the second coil, the second valve body is provided inside the sliding groove, and the second valve body is slidably connected to the sliding groove.

As a preferred technical scheme of the invention, the reset springs are symmetrically arranged, the reset springs are respectively provided with the left side and the right side of the hydraulic control reversing valve, one end of each reset spring is provided with a gasket, and the other end of each gasket is attached to the first valve core

As a preferred technical scheme of the invention, five oil cylinder connecting holes are formed in the bottom end of the hydraulic control reversing valve, an oil cylinder is installed at the bottom end of the hydraulic control reversing valve, and the oil cylinder connecting holes are connected with the oil cylinder.

Compared with the prior art, the invention has the following beneficial effects:

according to the invention, the effect of controlling the oil quantity to move along with the first valve core is achieved through the hydraulic control reversing valve, the oil quantity for controlling the first valve core can be gradually increased from small to large, so that the effect of slowly starting and gradually accelerating the oil cylinder in motion is achieved, the effect of gradually increasing the sizes of the a2 hole and the b2 hole is achieved through the a2 hole and the b2 hole when the oil quantity is controlled to move along with the first valve core, so that the effect of gradually increasing the control oil from small to large is achieved, and the first valve core 206 can also quickly return to the middle position when reset.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic cross-sectional structural view of the present invention;

FIG. 3 is an enlarged view of a portion of the structure of the present invention;

in the figure: 1. an electromagnetic directional valve; 101. a first coil; 102. a second coil; 103. a second valve core; 104. a component T1; 105. a component B1; 106. a component A1; 107. a part P1; 108. a1, holes; 109. b1, holes; 2. a hydraulic control directional control valve; 201. a2, holes; 202. a3, holes; 203. b2, holes; 204. b3, holes; 205. an R cavity; 206. a first valve spool; 207. a return spring.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.

Wherein like reference numerals refer to like parts throughout.

Example 1

As shown in fig. 1-3, the invention provides an improved buffer type electro-hydraulic directional valve, which comprises an electromagnetic directional valve 1 and a pilot operated directional valve 2, wherein a first coil 101 and a second coil 102 are respectively arranged at the left end and the right end inside the electromagnetic directional valve 1, a second valve spool 103 is arranged at one side of the first coil 101, a component B1 105 is arranged at the bottom end of the second valve spool 103, a B1 hole 109 is arranged at the bottom end of the component B1 105, a component P1 107 is arranged at one side of the component B1 105, a component A1 106 is arranged at one side of the component P1 107, A1 hole 108 is arranged at the bottom end of the component A1 106, a component T1 104 is arranged at one side of the component A1 106, damping screw plugs are arranged at the top ends of the A1 hole 108 and the B1 hole 109, a2 hole 201 is connected at the bottom end of the A1 hole 108, a3 hole 202 is connected at one end of the B1 hole 109, B3 hole 204 is connected at the bottom end of the B1 hole 109, B2 hole 203 is connected at the bottom end of the B3 hole 204, a3 hole 202 is provided with a return spring 207, and a return chamber R205 is arranged at the bottom side of the bottom of the valve spool 205, and a return spring chamber 205R 205.

Further, the component A1 106, the component B1 105, the component P1 and the component T1 104 are process holes, the component A1 communicates with the A1 hole 108, and communicates with the a2 hole 201 and the a3 hole 202 through the A1 hole 108, the pilot operated directional control valve 2 is symmetrically arranged inside, the A1 hole 108, the a2 hole 201 and the a3 hole 202 are symmetrical to the B1 hole 109, the B2 hole 203 and the B3 hole 204, hydraulic oil can flow through the A1, the a2 and the a3 hole 202 through the component A1 106, and hydraulic oil can also flow through the B1 hole 109, the B2 hole 203 and the B3 hole 204 through the component B1 105.

A sliding groove is provided between the first coil 101 and the second coil 102, the second spool 103 is provided inside the sliding groove, the second spool 103 is slidably connected to the sliding groove, and the second spool 103 can communicate with the component A1 106, the component B1 105, the component P1 107, and the component T1 104 by sliding inside the sliding groove.

The reset springs 207 are symmetrically arranged, the reset springs 207 are respectively arranged on the left side and the right side of the hydraulic control reversing valve 2, a gasket is installed at one end of each reset spring 207, the other end of each gasket is attached to the first valve core 206, and the reset springs 207 are used for helping the first valve core 206 to reset.

The bottom of the hydraulic control reversing valve 2 is provided with five oil cylinder connecting holes, the bottom of the hydraulic control reversing valve 2 is provided with an oil cylinder, and the oil cylinder connecting holes are connected with the oil cylinder.

Specifically, after the first coil 101 in the electromagnetic directional valve 1 is connected with voltage, an electromagnetic thrust is generated to push the second valve spool 103 to the right to enable the part P1 to communicate with the part B1 105 through the part P1 107 and the part A1 to communicate with the part T1 106 through the part T1 104, as shown in fig. 2, hydraulic oil enters the B1 hole 109 through the part B1 105 from the part P1, the B1 hole 109 flows through the B3 hole 204 and is sent into the R cavity 205 of the pilot-operated directional valve, and flows through the yet another diversion hole before the B3 hole 204, but since the first valve spool 206 in the pilot-operated directional valve 2 does not move yet, the B2 hole 203 is still in a closed state, the control oil cannot flow into the R cavity 205, during initial movement, the small flow of the control oil entering from the B3 hole 204 pushes the first valve spool 206 to move slowly, the first valve spool 206 moves to the left to the B2 hole 203, the B2 hole 203 gradually moves with the first valve spool 206 and then opens gradually, the control oil is gradually enlarged, and the movement speed of the first valve spool 206 is gradually increased, after the first coil 101 in the electromagnetic directional valve 1 is powered off, because the B2 hole 203 is in a full-open state, the first valve core 206 is pushed back to the middle position quickly by the reset spring 207, compared with the common hydraulic directional valve 2, the prior hydraulic directional valve 2 can only move the oil cylinder at a fixed speed, the oil cylinder with large control oil flow is too fast and too violent, the oil cylinder with small control oil flow is stable but the residual stroke of the switching process of the first valve core 206 is slow, after the first coil 101 in the electromagnetic directional valve 1 is powered off, the first valve core 206 is pushed back to the middle position by the reset spring 207, but because the damping screw plugs are arranged at the top ends of the A1 hole 108 and the B1 hole 109, the first valve core 206 has resistance when resetting, the resetting speed of the first valve core 206 is also slow, and the efficiency of production is not high, the invention can achieve the purpose that the oil quantity is controlled to move along with the first valve core 206, and the oil quantity for controlling the first valve core 206 can be gradually changed from small to large, the effect of slow starting and gradual acceleration during the movement of the oil cylinder is achieved, and the first valve core 206 can quickly return to the middle position when being reset.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An improved buffer type electro-hydraulic directional valve comprises an electromagnetic directional valve (1) and a hydraulic control directional valve (2), it is characterized in that the left end and the right end inside the electromagnetic directional valve (1) are respectively provided with a first coil (101) and a second coil (102), a second valve spool (103) is installed at one side of the first coil (101), a component B1 (105) is arranged at the bottom end of the second valve core (103), the bottom end of the component B1 (105) is provided with a B1 hole (109), a component P1 (107) is installed on one side of the component B1 (105), one side of the component P1 (107) is provided with a component A1 (106), the bottom end of the component A1 (106) is provided with an A1 hole (108), a component T1 (104) is arranged on one side of the component A1 (106), the top ends of the a1 hole (108) and the b1 hole (109) are provided with damping screw plugs, the bottom end of the a1 hole (108) is connected with a2 hole (201), one end of the a1 hole (108) is connected with an a3 hole (202), one end of the b1 hole (109) is connected with a b3 hole (204), the bottom end of the b1 hole (109) is connected with a b2 hole (203), the bottom sides of the b3 hole (204) and the a3 hole (202) are both provided with a return spring (207), an R cavity (205) is formed in the bottom side of the b3 hole (204), and a first valve core (206) is installed on one side of the R cavity (205).

2. The improved buffer type electro-hydraulic reversing valve is characterized in that the component A1 (106), the component B1 (105), the component P1 (107) and the component T1 (104) are all process holes, the component A1 (106) is communicated with the hole A1 (108), and the hole a2 (201) is communicated with the hole a3 (202) through the hole A1 (108).

3. The improved buffering type electro-hydraulic directional valve is characterized in that the hydraulic directional valve (2) is arranged symmetrically, and the a1 hole (108), the a2 hole (201) and the a3 hole (202) of the hydraulic directional valve are symmetrical to the b1 hole (109), the b2 hole (203) and the b3 hole (204).

4. The improved buffer type electro-hydraulic directional valve is characterized in that a sliding groove is formed between the first coil (101) and the second coil (102), the second valve core (103) is arranged in the sliding groove, and the second valve core (103) is in sliding connection with the sliding groove.

5. The improved buffering type electro-hydraulic reversing valve according to claim 1, wherein the return springs (207) are symmetrically arranged, the return springs (207) are respectively arranged at the left side and the right side of the hydraulic control reversing valve (2), a gasket is arranged at one end of each return spring (207), and the other end of each gasket is attached to the first valve core (206) to be arranged

6. The improved buffer type electro-hydraulic reversing valve according to claim 1, wherein five cylinder connecting holes are formed in the bottom end of the hydraulic control reversing valve (2), a cylinder is mounted at the bottom end of the hydraulic control reversing valve (2), and the cylinder connecting holes are connected with the cylinder.