Integrated electro-hydraulic reversing spool valve with overflow for large pilot diameter

Abstract

This utility model discloses a large-diameter integrated electro-hydraulic directional valve with overflow. The large-diameter integrated electro-hydraulic directional valve with overflow includes a valve body. The valve body contains a valve core, an electromagnetic directional valve, and an overflow valve. The valve body has a valve core channel penetrating the valve body. The valve core is slidably connected to the valve core channel. End caps are provided at both ends of the valve core channel. A spring cavity is provided inside the end cap, and a spring is provided in the spring cavity. The end of the valve core is connected to the end cap via the spring. An auxiliary oil passage is provided on the end cap. The valve body has multiple flow channels used as hydraulic oil circuits, and flow channel openings are formed on the outer surface of the valve body. Each flow channel opening includes at least a pressure port (P), a return port (T), a working port (A), and a working port (B). The oil inlet of the overflow valve is connected to the pressure port (P) via the flow channel, and the oil return port of the overflow valve is connected to the return port (T) via the flow channel.

Description

Technical Field

[0001] This invention relates to the field of hydraulic valve technology, and in particular to a large-diameter integrated electro-hydraulic directional valve with overflow. Background Technology

[0002] Backfilling technology is being used more and more widely in the field of mine backfilling. For large-scale engineering machinery, the flow rate of hydraulic systems is also increasing. Hydraulic slide valves are one of the most commonly used hydraulic components in hydraulic systems. In particular, in recent years, the demand for large-flow hydraulic systems in industrial equipment has made large-diameter hydraulic slide valves have a broader application prospect.

[0003] The current maximum diameter of existing hydraulic spool valves is DN50, which can no longer meet the needs of large flow hydraulic systems (4200L / min). Typically, hydraulic systems are composed of various valve blocks such as solenoid directional valves, hydraulic directional spool valves, and relief valves connected by hydraulic pipelines. This results in defects such as dispersed hydraulic system components, multiple assembly steps, numerous pipelines, and susceptibility to hydraulic oil leaks, which increases the difficulty of installation and maintenance.

[0004] Therefore, how to provide a valve assembly that integrates a directional valve and a relief valve into one unit, meets the needs of high-flow hydraulic systems, is easy to use, and has reliable performance has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] The present invention aims to overcome the shortcomings of the prior art and provide an integrated electro-hydraulic directional valve with a large diameter and an overflow valve.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] The large-diameter integrated electro-hydraulic directional valve with overflow includes a valve body (1), a valve core (2) inside the valve body (1), an electromagnetic directional valve (3) and an overflow valve (4) on the valve body (1), a valve core channel (5) penetrating the valve body (1) inside the valve body (1), the valve core (2) slidingly connected to the valve core channel (5), end caps (6) at both ends of the valve core channel (5), a spring cavity (7) inside the end cap (6), and a spring (8) inside the spring cavity (7). The end of the valve core (2) The valve body (1) is connected to the end cap (6) by a spring (8), and the end cap (6) is provided with an auxiliary oil passage (9). The valve body (1) is provided with multiple flow channels for hydraulic oil circuits, and flow channel openings are formed on the outer surface of the valve body (1). The flow channel openings include at least a pressure P port (10), a return oil T port (11), a working A port (12), and a working B port (13). The oil inlet of the relief valve (4) is connected to the pressure P port (10) through the flow channel, and the return oil port of the relief valve (4) is connected to the return oil T port (11) through the flow channel.

[0008] Preferably, the overflow valve (4) is a cartridge two-way overflow valve.

[0009] Preferably, the electromagnetic directional valve (3) is a three-position four-way electromagnetic directional valve.

[0010] Preferably, a flow divider block (14) is connected to the valve body (1), the connection end of the flow divider block (14) is provided with an oil port adapted to the flow channel, and multiple flow divider ports (15) are provided on the side of the flow divider block (14).

[0011] Preferably, the valve core channel (5) is provided with end blocks (16) at both ends for controlling the displacement stroke of the valve core (2), and the outer edge of the end blocks (16) is attached to the valve body (1).

[0012] Preferably, the end stop (16) is provided with a throttling hole (17).

[0013] Preferably, the valve core (2) has a rectangular pressure equalization groove.

[0014] Preferably, the valve core (2) is provided with a throttling groove (18) at the flow channel.

[0015] Preferably, the throttling slot (18) is semi-circular or triangular.

[0016] The present invention will be further described below:

[0017] This invention relates to a large-diameter integrated electro-hydraulic directional valve with overflow, designed as a three-position four-way electro-hydraulic directional valve with an O-type function in the center position. It includes a rectangular valve body 1, within which a valve core channel 5 is provided. A valve core 2 slides within the valve core channel 5 to form the size and position of the throttling orifice, thereby controlling the magnitude and direction of the flow through the valve orifice. The valve core 2 and valve block 1 are sealed with a clearance of 0.005 mm, which ensures both reasonable internal leakage and good lubrication. A flow channel is formed within the valve body 1 as a hydraulic oil circuit for connecting various hydraulic components. Integrating the hydraulic oil circuit piping within the valve body 1 effectively reduces oil leakage and increases working pressure. A flow channel opening is formed on the outer wall of the valve body 1, and the flow channel opening has a large diameter, preferably 80 mm. mm, meeting the usage requirements of high-flow hydraulic systems (4200L / min); the flow passage includes at least pressure port P10, return port T11, working port A12, and working port B13. The valve core channel 5 is provided with five annular grooves, three of which are connected to working port A12, working port B13, and pressure port P10 respectively, and the other two annular grooves are connected to return port T11 and are connected through the flow passage in the valve body.

[0018] The electromagnetic directional valve 3 is preferably a three-position four-way fast-response electromagnetic directional valve. The end cover 6 is provided with an auxiliary oil passage 9 that connects to the spring chamber 7. The spring chamber 7 is connected to the control oil port of the electromagnetic directional valve 3 through the auxiliary oil passage 9 and the corresponding flow passage on the valve body 1. Thus, the electromagnetic directional valve 3 controls the flow direction of the hydraulic oil. The hydraulic oil acts on one end of the valve core 2, pushing the valve core 2 to slide in the valve core channel 5, thereby realizing the valve core reversal. By setting the inlet, return port and flow passage of the electromagnetic directional valve 3 on the valve body 1, the external pipeline is reduced and the integration level of the valve block 1 is improved.

[0019] When the solenoid directional valve 3 is de-energized, the valve core 2 is positioned in the middle by the valve body 1 under the action of the springs 8 at both ends. At this time, the pressure port P 10, return port T 11, working port A 12, and working port B 12 of the directional valve are not connected. When the electromagnet on the left side of the solenoid directional valve 3 is energized, it pushes the valve core 2 to move to the left, so that the flow channels of the pressure port P 10 of the directional valve are connected to the flow channels of the working port A 12, the working port B 13, and the return port T 11. Conversely, when the electromagnet on the right side of the solenoid directional valve 3 is energized, the flow channels of the pressure port P 10, the working port B 13, the working port A 12, and the return port T 11 are connected.

[0020] A cartridge relief valve 4, which limits and protects hydraulic pressure, is connected to the valve body 1. It is preferably a two-way relief valve with a DN63 diameter and an oil flow capacity of 5000L / min. The oil inlet of the relief valve 4 is connected to the pressure port P 10 through the flow channel inside the valve body 1, and the oil return port of the relief valve 4 is connected to the oil return port T 11, thereby reducing the number of external hydraulic hoses. When the working pressure in the flow channel is higher than the set value of the relief valve 4, the oil pressure opens the relief valve 4 and unloads from the oil return port until the set value of the relief valve 4 is reached. The relief valve 4 then closes automatically, thereby protecting the various components of this valve from being affected by unstable system pressure.

[0021] By installing large-diameter diversion valve blocks 15 that are compatible with the flow channel diameter on the pressure port P 10, return port T 11, working port A 12, and working port B 13 of the valve body 1, the function of supplying flow to more than two actuators from the same oil source can be realized. By superimposing actuators through diversion valve blocks 15, the ease of installation for operators is improved. The excess flow channel openings formed on the valve body surface are sealed by plugs.

[0022] The valve core 2 is made of 42CrMo material. The maximum width of the flow channel between the valve core 2 and the valve body 1 reaches 50mm, and the maximum flow rate can reach 4200L / min. The pressure loss is small when the flow rate is large. The stroke of the valve core 2 is controlled at 50mm, and the response speed is fast. The valve core 2 adopts a full rectangular groove symmetrical design, which improves the lubrication effect of the valve core 2 and has a dirt resistance. The valve body 1 is integrally machined from ductile iron, which has a self-lubricating and wear-resistant function. The valve body 1 adopts QPQ treatment process to improve surface hardness and aesthetics. The valve core 2 is provided with a semi-circular throttling groove 18. When switching, the hydraulic oil is gradually throttled through the throttling groove 18 to reduce hydraulic oil impact and avoid excessive switching impact. A throttling hole 17 is provided in the middle of the valve core end block 14. The hole diameter is preferably within 0.5-2mm, which can prevent the valve core 2 from impacting the end cover 6 when switching, so that the valve core 2 is in a stable state during movement.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] The large-diameter integrated electro-hydraulic directional valve of the present invention integrates the directional valve and the relief valve into a single valve body, and provides a flow channel within the valve body for connecting various pressure components, thereby effectively reducing the possibility of oil leakage between valves, meeting the needs of high-flow hydraulic systems. The valve body has a compact structure, low cost, quick assembly, and convenient use and maintenance; by adopting a large-diameter flow channel, it meets the needs of ultra-high flow hydraulic systems and has high operational reliability. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the assembly of the large-diameter integrated electro-hydraulic directional valve with overflow of the present invention.

[0026] Figure 2 This is a schematic diagram of the valve body structure of the large-diameter integrated electro-hydraulic directional valve with overflow involved in this invention.

[0027] Figure 3 This is a cross-sectional schematic diagram of the large-diameter integrated electro-hydraulic directional valve with overflow of the present invention.

[0028] Figure 4 This is a schematic diagram of the valve core structure of the large-diameter integrated electro-hydraulic directional valve with overflow of the present invention.

[0029] Figure 5 This is a schematic diagram of the end block structure of the large-diameter integrated electro-hydraulic directional valve with overflow of the present invention;

[0030] Figure 6 This is a schematic diagram illustrating the working principle of the large-diameter integrated electro-hydraulic directional valve with overflow of the present invention.

[0031] In the diagram: 1. Valve body; 2. Valve core; 3. Solenoid directional valve; 4. Relief valve; 5. Valve core passage; 6. End cover; 7. Spring chamber; 8. Spring; 9. Auxiliary oil passage; 10. Pressure port P; 11. Return port T; 12. Working port A; 13. Working port B; 14. Diverter valve block; 15. Diverter port; 16. End stop block; 17. Throttling orifice; 18. Rectangular equalizing groove; 19. Throttling groove opening. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0033] See Figures 1 to 6 The large-diameter integrated electro-hydraulic directional valve with overflow includes a valve body 1, a valve core 2 inside the valve body 1, an electromagnetic directional valve 3 and an overflow valve 4 on the valve body 1, a valve core channel 5 passing through the valve body 1, the valve core 2 slidably connected to the valve core channel 5, end caps 6 at both ends of the valve core channel 5, a spring cavity 7 inside the end cap 6, a spring 8 inside the spring cavity 7, the end of the valve core 2 connected to the end cap 6 by the spring 8, and an auxiliary oil passage 9 on the end cap 6; the valve body 1 has multiple flow channels for hydraulic oil circuits, and flow channel openings are formed on the outer surface of the valve body 1, the flow channel openings include at least a pressure port P 10, a return port T 11, a working port A 12, and a working port B 13, the oil inlet of the overflow valve 4 is connected to the pressure port P 10 through the flow channel, and the oil return port of the overflow valve 4 is connected to the return port T 11 through the flow channel.

[0034] The overflow valve 4 is a cartridge two-way overflow valve; the solenoid directional valve 3 is a three-position four-way solenoid directional valve; a flow divider block 14 is connected to the valve body 1, and the connecting end of the flow divider block 14 is provided with an oil port adapted to the flow channel diameter; multiple flow divider ports 15 are provided on the side of the flow divider block; end blocks 16 for controlling the displacement stroke of the valve core 2 are provided at both ends of the valve core channel 5, and the outer edge of the end blocks 16 is attached to the valve body 1; a throttling orifice 17 is provided on the end blocks 16, and the valve core 2 and the valve core channel 5 are clearance-fitted; a rectangular pressure equalization groove is added to the valve core 2; a throttling slot 18 is provided at the flow channel of the valve core 2, and the throttling slot 18 is semi-circular or triangular.

Claims

1. A large-diameter integrated electro-hydraulic directional valve with overflow, the large-diameter integrated electro-hydraulic directional valve with overflow comprising a valve body (1), characterized in that, The valve body (1) contains a valve core (2), and the valve body (1) is equipped with an electromagnetic reversing valve (3) and an overflow valve (4). The valve body (1) contains a valve core channel (5) that passes through the valve body (1). The valve core (2) is slidably connected to the valve core channel (5). The valve core channel (5) has end caps (6) at both ends. The end caps (6) have spring cavities (7) inside, and springs (8) are installed inside the spring cavities (7). The end of the valve core (2) is connected to the end caps through the springs (8). (6) The end cap (6) is provided with an auxiliary oil passage (9); the valve body (1) is provided with multiple flow channels for hydraulic oil circuits, and flow channel openings are formed on the outer surface of the valve body (1). The flow channel openings include at least a pressure P port (10), a return oil T port (11), a working A port (12), and a working B port (13). The oil inlet of the relief valve (4) is connected to the pressure P port (10) through the flow channel, and the return oil port of the relief valve (4) is connected to the return oil T port (11) through the flow channel.

2. The large-diameter integrated electro-hydraulic directional valve with overflow according to claim 1, characterized in that, The overflow valve (4) is a cartridge two-way overflow valve.

3. The large-diameter integrated electro-hydraulic directional valve with overflow according to claim 1, characterized in that, The solenoid directional valve (3) is a three-position four-way solenoid directional valve.

4. The large-diameter integrated electro-hydraulic directional valve with overflow according to claim 1, characterized in that, A flow divider block (14) is connected to the valve body (1). The connection end of the flow divider block (14) is provided with an oil port that is compatible with the flow channel. Multiple flow divider ports (15) are provided on the side of the flow divider block (14).

5. The large-diameter integrated electro-hydraulic directional valve with overflow according to claim 1, characterized in that, The valve core channel (5) is provided with end blocks (16) at both ends for controlling the displacement stroke of the valve core (2), and the outer edge of the end blocks (16) is attached to the valve body (1).

6. The large-diameter integrated electro-hydraulic directional valve with overflow according to claim 5, characterized in that, The end block (16) is provided with a throttling hole (17).

7. The large-diameter integrated electro-hydraulic directional valve with overflow according to claim 1, characterized in that, The valve core (2) has a rectangular pressure equalization groove.

8. The large-diameter integrated electro-hydraulic directional valve with overflow according to any one of claims 1 to 7, characterized in that, The valve core (2) is provided with a throttling groove (18) in the flow channel.

9. The large-diameter integrated electro-hydraulic directional valve with overflow according to claim 8, characterized in that, The throttling slot (18) is semi-circular or triangular.

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