Needle valve action control oil way

Abstract

The utility model relates to the technical field of needle valve control oil ways, and particularly discloses a needle valve action control oil way which comprises a system oil port, a control valve, a first pressure reducing valve, a first needle valve reversing valve, a second pressure reducing valve and a second needle valve reversing valve. The control valve is located on the first pipeline and used for controlling the first pipeline to be opened or closed, the first needle valve reversing valve and the second needle valve reversing valve are connected with the two needle valve oil cylinders respectively, oil can be supplied to the two needle valve oil cylinders at the same time, and pressure adjustment can be conducted through the first pressure reducing valve and the second pressure reducing valve. The pressure of hydraulic oil entering each needle valve oil cylinder can be adjusted conveniently, the applicability is good, the whole oil way can be controlled to be opened or closed through the control valve, loop safety protection at the front end can be provided when the nozzle is not in place, and the one-way valves are arranged between the needle valve oil cylinders and the two needle valve reversing valves, so that the needle valves are kept stable.

Description

Technical Field

[0001] This utility model relates to the technical field of needle valve action control, and specifically to a needle valve action control oil circuit. Background Technology

[0002] With the continuous advancement of manufacturing processes, the requirements for the control of gate runners are also gradually increasing, demanding more precise control. In existing hydraulic systems, the multi-needle valve control circuit is a common control oil circuit used to achieve precise operation of the needle valve cylinder.

[0003] The traditional multi-needle valve control circuit is shown in the attached diagram in the instruction manual. Figure 2 As shown, it includes system oil port 1, third pressure reducing valve 16, fifth check valve 12, accumulator 13, second pressure relief valve 14, oil tank 15, sixth check valve 17, and two two-position four-way directional valves 18. The third pressure reducing valve 16 is located on the main oil line. When it is used to regulate the hydraulic oil pressure, the pressure of multiple needle valve cylinders is consistent, and it is impossible to regulate the pressure of a single set of needle valve cylinders. Its applicability is poor. Secondly, there is no control valve on its main line to protect the oil inlet. It is impossible to protect the front end of the gate when the nozzle is not in position, and it cannot guarantee the stability of the needle valve cylinder side pressure. Summary of the Invention

[0004] This utility model addresses the aforementioned problems and aims to provide a needle valve action control oil circuit. The load pressure of each needle valve cylinder can be adjusted independently, and the circuit has good stability. Furthermore, a control valve is provided on the main circuit to enable on / off switching and provide front-end circuit safety protection.

[0005] To achieve the above objectives, this utility model provides a needle valve actuation control oil circuit for supplying oil to a needle valve cylinder. It includes a system oil port, a control valve, a first pressure reducing valve, a first needle valve reversing valve, a second pressure reducing valve, and a second needle valve reversing valve. The system oil port is connected to the inlets of both the first and second pressure reducing valves via a first pipeline. The control valve is located on the first pipeline and is used to control the opening or closing of the first pipeline. The first pressure reducing valve is connected to one of the needle valve cylinders via the first needle valve reversing valve, and the second pressure reducing valve is connected to another needle valve cylinder via the second needle valve reversing valve.

[0006] The first needle valve directional valve is provided with a first oil inlet, a first oil return, a first variable oil port and a second variable oil port. The first oil inlet can be connected to the first variable oil port or the second variable oil port. The first oil inlet is connected to the oil outlet of the first pressure reducing valve. The first variable oil port is connected to the rod chamber of the needle valve cylinder. The second variable oil port is connected to the rodless chamber of the needle valve port.

[0007] The second needle valve reversing valve is provided with a second oil inlet, a second oil return port, a third variable oil port and a fourth variable oil port, wherein the second oil inlet can communicate with the third variable oil port or the fourth variable oil port, the second oil inlet communicates with the oil outlet of the second pressure reducing valve, the third variable oil port communicates with the rod cavity of the needle valve cylinder, and the fourth variable oil port communicates with the rodless cavity of the needle valve cylinder.

[0008] According to the needle valve action control oil circuit, the first needle valve reversing valve is provided with a first electromagnet and a second electromagnet, when the first electromagnet is powered, the first oil inlet communicates with the second variable oil port, and the first oil return port communicates with the first variable oil port, when the second electromagnet is powered, the first oil inlet communicates with the first variable oil port, and the first oil return port communicates with the second variable oil port.

[0009] According to the needle valve action control oil circuit, the second needle valve reversing valve is provided with a third electromagnet and a fourth electromagnet, when the third electromagnet is powered, the second oil inlet communicates with the fourth variable oil port, and the second oil return port communicates with the third variable oil port, when the fourth electromagnet is powered, the second oil inlet communicates with the third variable oil port, and the second oil return port communicates with the fourth variable oil port.

[0010] According to the needle valve action control oil circuit, the first variable oil port communicates with the rod cavity of one of the needle valve cylinders through a second pipeline, the second variable oil port communicates with the rodless cavity of the needle valve cylinder through a third pipeline, two first check valves are respectively installed on the second pipeline and the third pipeline;

[0011] The third variable oil port communicates with the rod cavity of the other needle valve cylinder through a fourth pipeline, the fourth variable oil port communicates with the rodless cavity of the needle valve cylinder through a fifth pipeline, and two second check valves are respectively installed on the fifth pipeline and the fourth pipeline.

[0012] According to the needle valve action control oil circuit, the first oil return port and the second oil return port both communicate with the oil tank.

[0013] The needle valve action control oil circuit further comprises a first pressure relief valve, an oil inlet of the first pressure relief valve is communicated with the second pipeline through a sixth pipeline, communicated with the third pipeline through a seventh pipeline, communicated with the fourth pipeline through an eighth pipeline, and communicated with the fifth pipeline through a ninth pipeline, third one-way valves are arranged on the sixth pipeline, the seventh pipeline, the eighth pipeline and the ninth pipeline, the third one-way valves are arranged with openings facing the first pressure relief valve, and an oil outlet of the first pressure relief valve is communicated with the oil tank.

[0014] The needle valve action control oil circuit further comprises a third electromagnet arranged on the first pressure relief valve, the first pressure relief valve is opened when the third electromagnet is powered, and the first pressure relief valve is closed when the third electromagnet is powered off.

[0015] The needle valve action control oil circuit further comprises a fourth one-way valve, an oil inlet of the fourth one-way valve is communicated with the first oil return port, the second oil return port and the oil outlet of the first pressure relief valve, and an oil outlet of the fourth one-way valve is communicated with the oil tank.

[0016] The needle valve action control oil circuit further comprises a fifth one-way valve, an oil inlet of the fifth one-way valve is communicated with an oil outlet of the control valve, and an oil outlet of the fifth one-way valve is communicated with oil inlets of the first pressure relief valve and the second pressure relief valve.

[0017] The needle valve action control oil circuit further comprises an accumulator and a second pressure relief valve, an oil inlet of the accumulator is communicated with an oil outlet of the fifth one-way valve, an oil outlet of the accumulator is communicated with oil inlets of the first pressure relief valve and the second pressure relief valve, and an oil inlet of the second pressure relief valve is communicated with the oil outlet of the fifth one-way valve.

[0018] The needle valve action control oil circuit has the following beneficial effects:

[0019] 1. The first pressure relief valve is arranged before the first needle valve reversing valve, the second pressure relief valve is arranged before the second needle valve reversing valve, the hydraulic oil pressure entering the first needle valve reversing valve and the second needle valve reversing valve can be adjusted independently through the first pressure relief valve and the second pressure relief valve, and then the needle valve oil cylinder with different requirements can be applied.

[0020] 2. The one-way valve is arranged between the first needle valve reversing valve and the needle valve oil cylinder, and the one-way valve is also arranged between the second needle valve reversing valve and the needle valve oil cylinder, so that the pressure of the needle valve oil cylinder can be maintained.

[0021] 3. The control valve is arranged on the first pipeline through which the system oil port discharges oil, the control valve can control the opening or closing of the first pipeline, and then the front-end loop safety protection can be provided. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a schematic diagram of the overall oil circuit of an embodiment;

[0023] Figure 2 is a schematic diagram of the overall oil circuit of the prior art.

[0024] in the figure:

[0025] 1, system oil port; 2, control valve; 3, first pressure reducing valve; 4, first needle valve reversing valve; 5, second pressure reducing valve; 6, second needle valve reversing valve; 7, first check valve; 8, second check valve; 9, first pressure relief valve; 10, third check valve; 11, fourth check valve; 12, fifth check valve; 13, accumulator; 14, second pressure relief valve; 15, oil tank; 16, third pressure reducing valve; 17, sixth check valve; 18, two-position four-way reversing valve. DETAILED DESCRIPTION

[0026] The following is a specific embodiment of the present application and further describes the technical scheme of the present application in combination with the accompanying drawings, but the present application is not limited to these embodiments.

[0027] As shown in Figure 1 , a needle valve action control oil circuit is used to supply oil to the needle valve oil cylinder to control the precise movement of the needle valve.

[0028] Specifically, the needle valve action control oil circuit includes a system oil port 1, a control valve 2, a first pressure reducing valve 3, a first needle valve reversing valve 4, a second pressure reducing valve 5, and a second needle valve reversing valve 6. The system oil port 1 is in communication with the oil inlet of the first pressure reducing valve 3 and the second pressure reducing valve 5 through a first pipeline. The control valve 2 is located on the first pipeline and is used to control the opening or closing of the first pipeline. The first needle valve reversing valve 4 and the second needle valve reversing valve 6 are respectively connected to two needle valve oil cylinders, so that oil can be supplied to the two needle valve oil cylinders at the same time. The first needle valve reversing valve 4 and the second needle valve reversing valve 6 are both three-position four-way reversing valves. The hydraulic oil flowing out of the system oil port 1 flows into the first pressure reducing valve 3 and the second pressure reducing valve 5 through the control valve 2. After being reduced in pressure by the first pressure reducing valve 3 and the second pressure reducing valve 5, the hydraulic oil flows into the two needle valve oil cylinders through the first needle valve reversing valve 4 and the second needle valve reversing valve 6, respectively. Since the pressure of the hydraulic oil entering each needle valve oil cylinder can be adjusted by using the first pressure reducing valve 3 and the second pressure reducing valve 5, the adaptability is good. Moreover, the overall oil circuit can be controlled to be opened or closed by the control valve 2, and the front-end circuit safety protection can be provided when the nozzle is not in place.

[0029] In this embodiment, in order to detect the pressure of the hydraulic oil after being reduced by the first pressure reducing valve 3 and the second pressure reducing valve 5, a pressure gauge can be connected in parallel after the first pressure reducing valve 3 and the second pressure reducing valve 5, respectively.

[0030] Specifically, the first needle valve reversing valve 4 is provided with a first oil inlet, a first oil return, a first variable oil port and a second variable oil port. The first oil inlet is in communication with the first variable oil port or the second variable oil port. The first oil inlet is in communication with the oil outlet of the first pressure reducing valve 3. The first variable oil port is in communication with the rod cavity of the needle valve oil cylinder. The second variable oil port is in communication with the rodless cavity of the needle valve oil port. The first needle valve reversing valve 4 is provided with a first electromagnet and a second electromagnet. When the first electromagnet is powered, the first oil inlet is in communication with the second variable oil port, and the first oil return is in communication with the first variable oil port. At this time, the hydraulic oil from the system oil port 1 enters the rodless cavity of the needle valve oil cylinder through the first oil inlet and the second variable oil port. The hydraulic oil in the rod cavity enters the oil tank 15 through the first variable oil port and the first oil return. When the second electromagnet is powered, the first oil inlet is in communication with the first variable oil port, and the first oil return is in communication with the second variable oil port. In this state, the hydraulic oil from the system oil port 1 enters the rod cavity of the needle valve oil cylinder through the first oil inlet and the first variable oil port. The hydraulic oil in the rodless cavity enters the oil tank 15 through the second variable oil port and the first oil return.

[0031] Specifically, the second needle valve reversing valve 6 is provided with a second oil inlet, a second oil return, a third variable oil port and a fourth variable oil port. The second oil inlet is in communication with the third variable oil port or the fourth variable oil port. The second oil inlet is in communication with the oil outlet of the second pressure reducing valve 5. The third variable oil port is in communication with the rod cavity of the needle valve oil cylinder. The fourth variable oil port is in communication with the rodless cavity of the needle valve oil cylinder. Similarly, the second needle valve reversing valve 6 is provided with a third electromagnet and a fourth electromagnet. When the third electromagnet is powered, the second oil inlet is in communication with the fourth variable oil port, and the second oil return is in communication with the third variable oil port. At this time, the hydraulic oil from the system oil port 1 enters the rodless cavity of the other needle valve oil cylinder through the second oil inlet and the fourth variable oil port. The hydraulic oil in the rod cavity enters the oil tank 15 through the third variable oil port and the second oil return. When the fourth electromagnet is powered, the second oil inlet is in communication with the third variable oil port, and the second oil return is in communication with the fourth variable oil port. At this time, the hydraulic oil from the system oil port 1 enters the rod cavity of the needle valve oil cylinder through the second oil inlet and the third variable oil port. The hydraulic oil in the rodless cavity enters the oil tank 15 through the fourth variable oil port and the second oil return.

[0032] In order to ensure the oil pressure stability of the oil inlet cavities of the two needle valve oil cylinders, two first one-way valves 7 and two second one-way valves 8 are further included, the first variable oil port is communicated with the rod cavity of one needle valve oil cylinder through a second pipeline, the second variable oil port is communicated with the rodless cavity of the needle valve oil cylinder through a third pipeline, the two first one-way valves 7 are respectively installed on the second pipeline and the third pipeline, the third variable oil port is communicated with the rod cavity of the other needle valve oil cylinder through a fourth pipeline, the fourth variable oil port is communicated with the rodless cavity of the needle valve oil cylinder through a fifth pipeline, the two second one-way valves 8 are respectively installed on the fifth pipeline and the fourth pipeline, in the embodiment, the two first one-way valves 7 provide pressure maintaining effect for one of the needle valve oil cylinders to avoid backflow of hydraulic oil in the oil inlet cavity, and the two second one-way valves 8 provide pressure maintaining effect for the other needle valve oil cylinder to improve its stability and control accuracy; in the embodiment, in order to realize oil return after adding one-way valves, taking the two first one-way valves 7 as an example, an oil passage connecting the second pipeline and the third pipeline is arranged between the two first one-way valves 7, for example, when the first variable oil port discharges oil, the hydraulic oil enters the rod cavity of the needle valve oil cylinder through the second pipeline and one first one-way valve 7, part of which flows into the oil passage between the two first one-way valves 7 during the oil inlet process, which opens the first one-way valve 7 on the third pipeline, so that the hydraulic oil in the rodless cavity of the needle valve oil cylinder can be discharged through the third pipeline and the first one-way valve 7, and the control principle of the two second one-way valves 8 and the above principle is the same.

[0033] In order to accommodate the hydraulic oil generated by oil return or pressure relief, it further includes an oil tank 15, the first return port and the second return port are both communicated with the oil tank 15, and the oil returned through the first return port and the second return port will enter the oil tank 15, avoiding pollution to the environment.

[0034] Of course, in the embodiment, only two needle valve oil cylinders are used, and the oil passage in the application can also control three or more needle valve oil cylinders, only a set of pressure reducing valve and needle valve reversing valve need to be added.

[0035] In order to improve the hydraulic safety performance of the two needle valve oil cylinders, the first pressure relief valve 9 is further included. The oil inlet of the first pressure relief valve 9 is communicated with the second pipeline through the sixth pipeline, communicated with the third pipeline through the seventh pipeline, communicated with the fourth pipeline through the eighth pipeline, and communicated with the fifth pipeline through the ninth pipeline. The third one-way valve 10 is arranged on the sixth pipeline, the seventh pipeline, the eighth pipeline, and the ninth pipeline. The opening of the third one-way valve 10 faces the first pressure relief valve 9. The oil outlet of the first pressure relief valve 9 is communicated with the oil tank 15. The third electromagnet is arranged on the first pressure relief valve 9. When the third electromagnet is powered, the first pressure relief valve 9 is opened. When the third electromagnet is de-energized, the first pressure relief valve 9 is closed. Under normal circumstances, the third electromagnet is in a de-energized state, and pressure relief is not required. When the pressure of one cavity of the two needle valve oil cylinders exceeds the safety threshold, the third electromagnet is powered at this time, and the first pressure relief valve 9 is opened. The two needle valve oil cylinders can be pressure relieved through the first pressure relief valve 9, and the protection function is realized.

[0036] In order to avoid interference with the oil return pipeline, the fourth one-way valve 11 is further included. The oil inlet of the fourth one-way valve 11 is communicated with the first oil return port, the second oil return port, and the oil outlet of the first pressure relief valve 9. The oil outlet of the fourth one-way valve 11 is communicated with the oil tank 15. That is, all the oil is collected on one oil pipeline before returning to the oil tank 15 and passes through the fourth one-way valve 11. The fourth one-way valve 11 can isolate the pressure on the side of the oil tank 15, avoid the influence of the oil pressure on the side of the oil tank 15 on the oil return, and avoid the influence of the oil return pressure on the first needle valve reversing valve 4 and the second needle valve reversing valve 6. The fourth one-way valve 11 can perform oil return interference protection.

[0037] Specifically, the fifth one-way valve 12 is further included. The oil inlet of the fifth one-way valve 12 is communicated with the oil outlet of the control valve 2. The oil outlet of the fifth one-way valve 12 is communicated with the oil inlets of the first pressure relief valve 3 and the second pressure relief valve 5. The fifth one-way valve 12 is used to prevent the hydraulic oil in the total oil pipeline from flowing backward.

[0038] In order to automatically supplement the pressure, the accumulator 13 and the second pressure relief valve 14 are further included. The oil inlet of the accumulator 13 is communicated with the oil outlet of the fifth one-way valve 12. The oil outlet of the accumulator 13 is communicated with the oil inlets of the first pressure relief valve 3 and the second pressure relief valve 5. The oil inlet of the second pressure relief valve 14 is communicated with the oil outlet of the fifth one-way valve 12. Part of the hydraulic oil input into the total oil pipeline from the system oil port 1 enters the accumulator 13, and the other part enters the first pressure relief valve 3 and the second pressure relief valve 5. An electromagnet is arranged on the second pressure relief valve 14. When the electromagnet is powered, the second pressure relief valve 14 is closed. The hydraulic oil in the accumulator 13 can only be used to supplement the oil for the first pressure relief valve 3 and the second pressure relief valve 5. When the electromagnet is de-energized, the second pressure relief valve 14 is opened. The accumulator 13 can be pressure relieved through the second pressure relief valve 14.

[0039] In the embodiment, a pressure gauge can be arranged on the first pipeline to detect the oil pressure of the main oil circuit.

[0040] The technical solutions of the utility model are described in detail above with reference to the drawings, and the described embodiments are used to help understand the idea of the utility model. The specific embodiments described in this document are merely examples of the spirit of the utility model. Those skilled in the art of the utility model can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the utility model or exceed the scope defined by the appended claims.

[0041] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications will also change accordingly.

[0042] In addition, the descriptions such as "first", "second", "one" and the like in the utility model are only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0043] In the utility model, unless otherwise specifically defined and limited, the terms "connection", "fixation" and the like should be understood broadly, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0044] In addition, the technical solutions of each embodiment of the utility model can be combined with each other, but it must be based on the realization of ordinary technical personnel in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor is it within the protection scope required by the utility model.

Claims

1. A needle valve actuating control oil passage for supplying oil to a needle valve cylinder, characterized by, The system oil port, the control valve, the first pressure reducing valve, the first needle valve reversing valve, the second pressure reducing valve and the second needle valve reversing valve are included, the system oil port is communicated with the oil inlet of the first pressure reducing valve and the second pressure reducing valve through the first pipeline, the control valve is arranged on the first pipeline and is used for controlling the opening or closing of the first pipeline, the first pressure reducing valve is connected with one needle valve cylinder through the first needle valve reversing valve, and the second pressure reducing valve is connected with another needle valve cylinder through the second needle valve reversing valve. The first inlet, the first return port, the first variable oil port and the second variable oil port are arranged on the first needle valve reversing valve, the first inlet is communicated with the first variable oil port or the second variable oil port, the first inlet is communicated with the oil outlet of the first pressure reducing valve, the first variable oil port is communicated with the rod cavity of the needle valve cylinder, and the second variable oil port is communicated with the rodless cavity of the needle valve cylinder. The second inlet, the second return port, the third variable oil port and the fourth variable oil port are arranged on the second needle valve reversing valve, the second inlet is communicated with the third variable oil port or the fourth variable oil port, the second inlet is communicated with the oil outlet of the second pressure reducing valve, the third variable oil port is communicated with the rod cavity of the needle valve cylinder, and the fourth variable oil port is communicated with the rodless cavity of the needle valve cylinder.

2. A needle valve actuating control oil passage according to claim 1, wherein The first electromagnet and the second electromagnet are arranged on the first needle valve reversing valve, when the first electromagnet is powered, the first inlet is communicated with the second variable oil port, and the first return port is communicated with the first variable oil port, when the second electromagnet is powered, the first inlet is communicated with the first variable oil port, and the first return port is communicated with the second variable oil port.

3. A needle valve actuating control oil passage according to claim 1 or 2, characterized by The third electromagnet and the fourth electromagnet are arranged on the second needle valve reversing valve, when the third electromagnet is powered, the second inlet is communicated with the fourth variable oil port, and the second return port is communicated with the third variable oil port, when the fourth electromagnet is powered, the second inlet is communicated with the third variable oil port, and the second return port is communicated with the fourth variable oil port.

4. A needle valve actuating control oil passage according to claim 1, wherein Two first one-way valves and two second one-way valves are further included, the first variable oil port is communicated with the rod cavity of one needle valve cylinder through the second pipeline, the second variable oil port is communicated with the rodless cavity of the needle valve cylinder through the third pipeline, and the two first one-way valves are respectively arranged on the second pipeline and the third pipeline. The third variable oil port is communicated with the rod cavity of another needle valve cylinder through the fourth pipeline, the fourth variable oil port is communicated with the rodless cavity of the needle valve cylinder through the fifth pipeline, and the two second one-way valves are respectively arranged on the fifth pipeline and the fourth pipeline.

5. A needle valve actuating control oil passage according to claim 4, wherein An oil tank is further included, and the first return port and the second return port are communicated with the oil tank.

6. A needle valve actuating control oil passage according to claim 5 wherein, The first pressure relief valve has an oil inlet communicated with the second pipeline through a sixth pipeline, with the third pipeline through a seventh pipeline, with the fourth pipeline through an eighth pipeline, and with the fifth pipeline through a ninth pipeline, and a third one-way valve is arranged on each of the sixth, seventh, eighth and ninth pipelines and has an opening facing the first pressure relief valve, and an oil outlet of the first pressure relief valve is communicated with the oil tank.

7. A needle valve actuating control oil passage according to claim 6 wherein, The first pressure relief valve is provided with a third electromagnet, and the first pressure relief valve is opened when the third electromagnet is powered on and is closed when the third electromagnet is powered off.

8. A needle valve actuating control oil passage according to claim 6 wherein, The fourth one-way valve has an oil inlet communicated with the first and second oil return ports and an oil outlet communicated with the oil tank.

9. A needle valve actuating control oil passage according to claim 1 wherein, The fifth one-way valve has an oil inlet communicated with the oil outlet of the control valve and an oil outlet communicated with the oil inlets of the first and second pressure relief valves.

10. A needle valve actuating control oil passage according to claim 9, wherein The accumulator has an oil inlet communicated with the oil outlet of the fifth one-way valve and an oil outlet communicated with the oil inlets of the first and second pressure relief valves, and the second pressure relief valve has an oil inlet communicated with the oil outlet of the fifth one-way valve.

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