Hydraulic reversing valve for wood splitting machine

Abstract

The hydraulic reversing valve comprises two load feedback self-resetting reversing valves arranged in a valve body, a first valve rod and a second valve rod which are connected with the load feedback self-resetting reversing valves respectively are arranged in the valve body, and an oil port P and an oil port T are formed in the left side and the right side of the valve body respectively. The front end of the valve body is provided with an oil port A1 and an oil port B1 which are connected with a first valve rod oil way and an oil port A2 and an oil port B2 which are connected with a second valve rod oil way. Load feedback self-resetting reversing valve oil inlets used for feeding oil into the two load feedback self-resetting reversing valves are arranged between the oil port A1 and the oil port B1 and between the oil port A2 and the oil port B2 respectively. According to the utility model, the oil cylinder can be independently operated to work by a single valve or simultaneously operated to work by two valves, so that the cost is greatly reduced, the arrangement of hydraulic pipelines is simpler and more convenient during the design of hydraulic parts, the occupied space is reduced, the material resources are saved, the labor force of a user is reduced, and the production benefit is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of reversing valves, and more specifically to a hydraulic reversing valve for a wood splitter. Background Art

[0002] The manually controlled reversing valve is assembled on the wood splitter, and the reversing valve is used to control the extension and retraction of the cylinder. When the cylinder is extended to the preset position, the valve stem of the reversing valve is manually operated to return to the middle position, and the cylinder can stop extending. The action of retracting the cylinder requires the operator to reversely operate the reversing valve again before the cylinder can be retracted. This process requires the operator to operate the reversing valve cylinder twice to complete a reciprocating motion, which increases the operator's labor, takes up production time, and has low production efficiency. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a hydraulic reversing valve for a wood splitter, which can complete a reciprocating motion by operating the oil cylinder only once, thereby reducing the labor of the operator and improving the production efficiency.

[0004] In order to solve the above technical problems, the technical solutions adopted by the present utility model are as follows.

[0005] A hydraulic reversing valve for a wood splitter comprises two load feedback self-resetting reversing valves arranged in a valve body, wherein two 1# valve stems and 2# valve stems respectively connected to the load feedback self-resetting reversing valves are arranged in the valve body, a P oil port and a T oil port are respectively arranged on the left and right sides of the valve body, an A1 oil port and a B1 oil port connected to the 1# valve stem oil circuit and an A2 oil port and a B2 oil port connected to the 2# valve stem oil circuit are respectively arranged at the front end of the valve body, and load feedback self-resetting reversing valve oil inlets for supplying oil to the two load feedback self-resetting reversing valves are respectively arranged between the A1 oil port and the B1 oil port and between the A2 oil port and the B2 oil port.

[0006] To further optimize the technical solution, the oil inlet passage of the load feedback self-reset reversing valve connected to the 1# valve stem and the oil inlet passage of the load feedback self-reset reversing valve connected to the 2# valve stem are connected in series.

[0007] To further optimize the technical solution, the sliding valve mid-position function of the 1# valve stem is N-type, and the sliding valve mid-position function of the 2# valve stem is M-type.

[0008] To further optimize the technical solution, a steel column positioning sleeve is provided inside the valve body for positioning the upward position of the valve stem.

[0009] To further optimize the technical solution, a safety valve connected to the oil circuit in the valve body for pressure relief is provided at the side end of the valve body.

[0010] Due to the adoption of the above technical scheme, the technical progress achieved by the present invention is as follows.

[0011] The utility model provides a hydraulic reversing valve for a wood splitter, which controls an oil cylinder to make reciprocating motion through two reversing valves at the same time. The connection mode of the reversing valve and the oil cylinder can be selected according to the requirements of the hydraulic system. The oil cylinder can be operated by a single valve alone or by two valves at the same time, which greatly reduces the cost. At the same time, when the hydraulic parts are designed, the layout of the hydraulic pipeline is more concise and convenient, which reduces the occupied space, saves material resources, reduces the labor of users, and improves the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the utility model;

[0013] Figure 2 It is a right side view of the utility model;

[0014] Figure 3 For this utility model Figure 1 Sectional view in the AA direction;

[0015] Figure 4 For this utility model Figure 2 Cross-sectional view in the BB direction;

[0016] Figure 5 This is a structural diagram of the load feedback self-resetting reversing valve of the utility model;

[0017] Figure 6 This is a schematic diagram of the structure when the valve stem is in the middle position in Example 1 of the utility model;

[0018] Figure 7 This is a structural schematic diagram of the 1# valve stem being moved downward when operated alone in Embodiment 1 of the utility model;

[0019] Figure 8 This is a structural schematic diagram of the 1# valve stem being moved upward when operating alone in Example 1 of the utility model;

[0020] Fig. 9 This is a schematic diagram of the structure when the valve stem is in the middle position in Example 2 of the utility model;

[0021] Fig.10 This is a structural schematic diagram of the 2# valve stem being moved downward when operated alone in Embodiment 2 of the utility model;

[0022] Fig.11 This is a structural schematic diagram of the 2# valve stem being moved upward when operated alone in Embodiment 2 of the utility model;

[0023] Fig.12 This is a schematic diagram of the structure when the valve stems in Embodiment 3 of the present utility model are in the middle position;

[0024] Fig.13This is a schematic diagram of the structure when the valve stems in Embodiment 3 of the utility model are all moved upward;

[0025] Fig.14 This is a schematic diagram of the structure after the 1# valve stem is reset in Example 3 of the utility model;

[0026] Fig.15 This is a schematic diagram of the connection of the oil port pipelines in Example 3 of the utility model.

[0027] Among them: 1. Valve body, 2. P oil port, 3. T oil port, 4. 1# valve stem, 5. 2# valve stem, 6. A1 oil port, 7. B1 oil port, 8. A2 oil port, 9. B2 oil port, 10. Safety valve, 11. Load feedback self-reset reversing valve, 12. Steel column positioning sleeve, 13. Load feedback self-reset reversing valve oil inlet, 14. Oil cylinder, 15. Gear pump,

[0028] 16. Fuel tank. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] A hydraulic reversing valve for a wood splitter, combined with Figures 1 to 4 As shown, it includes a valve body 1, in which two load feedback self-resetting reversing valves 11 are arranged, and the valve body 1 is provided with two 1# valve stems 4 and 2# valve stems 5 extending out of the valve body, and the 1# valve stem and the 2# valve stem are respectively connected to the corresponding two load feedback self-resetting reversing valves 11, and the 1# valve stem and the 2# valve stem can slide between the neutral position of the valve body and the upward working position and the downward working position of the neutral position respectively.

[0031] A P oil port 2 is provided on the right side of the valve body 1, and a T oil port 3 is provided on the left side of the valve body 1, wherein the 1# valve stem 4 is close to the P oil port 2, and the 2# valve stem 5 is close to the T oil port 3. An A1 oil port 6, a B1 oil port 7, an A2 oil port 8 and a B2 oil port 9 are provided at the front end of the valve body 1, the A1 oil port and the B1 oil port are respectively connected to the oil circuit of the 1# valve stem, the A2 oil port and the B2 oil port are respectively connected to the oil circuit of the 2# valve stem, a load feedback self-reset reversing valve oil inlet 13 for connecting the load feedback self-reset reversing valve to the 1# valve stem is provided between the A1 oil port and the B1 oil port, and a load feedback self-reset reversing valve oil inlet 13 for connecting the load feedback self-reset reversing valve to the 2# valve stem is provided between the A2 oil port and the B2 oil port.

[0032] The oil inlet passage of the load feedback self-reset reversing valve connected to the 1# valve stem 4 is connected in series with the oil inlet passage of the load feedback self-reset reversing valve connected to the 2# valve stem 5. The slide valve mid-position function of the 1# valve stem 4 is N type, and the slide valve mid-position function of the 2# valve stem 5 is M type. In this way, any one of the reversing valves can be operated individually to control the cylinder to reciprocate, and the two reversing valves can be operated simultaneously to control a hydraulic cylinder to reciprocate.

[0033] A steel column positioning sleeve 12 is provided on the internal load feedback self-reset reversing valve 11 of the valve body 1 to locate the position where the valve stem moves upward. The structure of the load feedback self-reset reversing valve 11 is as follows: Figure 5 As shown, regarding the working principle of the load feedback self-resetting reversing valve 11, the company's previously applied patent ZL201320492386.3 discloses a load feedback self-resetting reversing valve with a detailed introduction, which will not be described in this application.

[0034] A safety valve 10 is provided at the side end of the valve body 1. The safety valve is connected to the oil circuit in the valve body and is used to release pressure when the pressure is too high, thereby improving the safety of the reversing valve when in use.

[0035] Example 1

[0036] When the 1# valve stem operates the reversing valve alone to control the oil cylinder to make reciprocating motion, the structural diagram of its operation is as follows: Figures 6 to 8 As shown, when the 1# valve stem is in the middle position, the P oil port is connected to the T oil port, the A1 oil port is connected to the T oil port, and the B1 oil port is closed; when the 1# valve stem moves up, the P oil port is connected to the A1 oil port, and also to the 1# load feedback self-reset reversing valve, and the B1 oil port is connected to the T oil port. When the P oil port pressure reaches the preset bounce pressure of the 1# load feedback self-reset reversing valve, the internal structure of the 1# load feedback self-reset reversing valve changes, and then the 1# valve stem is displaced under the action of the reset spring, and the valve stem will automatically return to the middle position; when the 1# valve stem moves down, the P oil port is connected to the B1 oil port, and the A1 oil port is connected to the T oil port.

[0037] Example 2

[0038] When the 2# valve stem operates the reversing valve alone to control the oil cylinder to make reciprocating motion, the structural diagram of its operation is as follows: Figures 9 to 11 As shown, when the 2# valve stem is in the middle position, the P oil port is connected to the T oil port, and the A2 oil port and the B2 oil port are closed; when the 2# valve stem moves up, the P oil port is connected to the A2 oil port, and also to the 2# load feedback self-reset reversing valve, and the B2 oil port is connected to the T oil port. When the P oil port pressure reaches the preset bounce pressure of the 2# load feedback self-reset reversing valve, the internal structure of the 2# load feedback self-reset reversing valve changes, and then the 2# valve stem is displaced under the action of the reset spring, and the 2# valve stem automatically returns to the middle position; when the 2# valve stem moves down, the P oil port is connected to the B2 oil port, and the A2 oil port is connected to the T oil port.

[0039] Example 3

[0040] When the 1# valve stem and the 2# valve stem jointly control a cylinder to make reciprocating motion, the structural diagram of the working state is as follows: Figure 12 to Figure 14 As shown in the figure, the reversing valve connected to the 1# valve stem is responsible for controlling the extension of the oil cylinder and stopping the movement at the preset pressure, and the reversing valve connected to the 2# valve stem is responsible for controlling the contraction of the oil cylinder and stopping the movement at the preset pressure. The connection diagram of the external oil circuit of the valve body is shown in the figure Fig.15 As shown, the B2 oil port is closed, the A2 oil port and the B1 oil port are connected in series to the rod chamber of the oil cylinder 14, the A1 oil port is connected to the rodless chamber of the oil cylinder 14, the P oil port is connected to the gear pump 15, and the T oil port is connected to the oil tank 16.

[0041] When the 1# valve stem and the 2# valve stem are both in the middle position, the P oil port is connected to the T oil port, the A1 oil port is connected to the T oil port, the B1 oil port and the A2 oil port are closed, and the cylinder does not move at this time; when the 1# valve stem and the 2# valve stem move up at the same time, the P oil port is connected to the A1 oil port (the oil enters the rodless chamber of the cylinder, and the cylinder extends at this time), the P oil port is also connected to the 1# load feedback self-reset reversing valve (stop working when it reaches the limit), and the B1 oil port is connected to the T oil port (oil returns to the rod chamber of the cylinder). When the P oil port pressure is greater than the preset pressure of the 1# load feedback self-reset reversing valve, the internal structure of the 1# load feedback self-reset reversing valve changes, and the 1# valve stem is displaced under the action of the reset spring and automatically returns to the middle position. At this time, the 1# valve stem is connected The connected reversing valve completes the action of extending and stopping the cylinder; then the oil at the P oil port flows into the A2 oil port of the 2# valve stem reversing valve through the oil channel of the 1# valve stem reversing valve. The A2 oil port and the B1 oil port are connected in series to the rod chamber of the cylinder, and the A1 oil port is connected to the rodless chamber of the cylinder. At this time, the oil circuit will be reversed, that is, the cylinder begins to contract. At this time, the P oil port is also connected to the 2# load feedback self-resetting reversing valve. When the cylinder contracts to the limit, the pressure at the P oil port will rise. When the pressure at the P oil port is greater than the preset pressure of the 2# load feedback self-resetting reversing valve, the 2# valve stem is displaced under the action of the reset spring and automatically returns to the middle position. At this time, the 2# valve stem reversing valve completes the action of contracting the cylinder and stopping in place.

Claims

1. A hydraulic reversing valve for a wood splitter, characterized in that: The invention comprises two load feedback self-resetting reversing valves (11) arranged in a valve body (1). Two 1# valve stems (4) and 2# valve stems (5) respectively connected to the load feedback self-resetting reversing valves (11) are arranged in the valve body (1). A P oil port (2) and a T oil port (3) are respectively arranged on the left and right sides of the valve body (1). An A1 oil port (6) and a B1 oil port (7) connected to the 1# valve stem oil circuit and an A2 oil port (8) and a B2 oil port (9) connected to the 2# valve stem oil circuit are respectively arranged at the front end of the valve body (1). Load feedback self-resetting reversing valve oil inlet ports (13) for supplying oil to the two load feedback self-resetting reversing valves are respectively arranged between the A1 oil port (6) and the B1 oil port (7) and between the A2 oil port (8) and the B2 oil port (9).

2. The hydraulic reversing valve for a wood splitter according to claim 1, characterized in that: The oil inlet passage of the load feedback self-resetting reversing valve connected to the 1# valve stem (4) and the oil inlet passage of the load feedback self-resetting reversing valve connected to the 2# valve stem (5) are connected in series.

3. The hydraulic reversing valve for a wood splitter according to claim 1, characterized in that: The slide valve mid-position function of the 1# valve stem (4) is of N type, and the slide valve mid-position function of the 2# valve stem (5) is of M type.

4. The hydraulic reversing valve for a wood splitter according to claim 1, characterized in that: A steel column positioning sleeve (12) for positioning the upward position of the valve stem is arranged inside the valve body (1).

5. The hydraulic reversing valve for a wood splitter according to claim 1, characterized in that: A safety valve (10) connected to an oil circuit in the valve body for pressure relief is provided at the side end of the valve body (1).

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