Hydraulic superposition control valve and control loop thereof

Abstract

The hydraulic superposition control valve comprises a superposition valve body, a counterbalance valve and a one-way valve, threaded mounting holes are formed in the two ends of the superposition valve body, and the counterbalance valve and the one-way valve are inserted into the threaded mounting holes; the sandwich valve body is provided with two oppositely arranged mounting surfaces, the first mounting surface is provided with an oil port P, an oil port A, an oil port B, an oil port TA and an oil port TB, the second mounting surface is provided with an oil port P1, an oil port A1, an oil port B1, an oil port TA1 and an oil port TB1, the oil port P is communicated with the oil port P1, the oil port TA is communicated with the oil port TA1, the oil port TB is communicated with the oil port TB1, the oil port B is communicated with an inlet of a one-way valve, an outlet of the one-way valve is communicated with the oil port B1, and the oil port B1 is communicated with the oil port B1. The oil port A is communicated with the first oil port of the counterbalance valve, the second oil port of the counterbalance valve is communicated with the oil port A1, the counterbalance valve is provided with a control oil port, and the control oil port is communicated with the oil port B. Different control functions of the two working cavities are integrated on one sandwich valve, and multiple control functions are achieved in the minimum installation space.

Description

TECHNICAL FIELD

[0001] The utility model relates to the valve class element technical field in hydraulic transmission system, concretely relates to a hydraulic superposition control valve. BACKGROUND

[0002] Hydraulic transmission and control technology is one of the key technologies of modern transmission and control, and is widely used and popularized in various industrial fields. The hydraulic transmission system is composed of five parts such as power elements, execution elements and control elements. The control elements control and regulate the pressure, flow and direction of the liquid in the hydraulic transmission system, and ensure that the working mechanism realizes the required function.

[0003] The control elements are generally various valve class elements. The valve class elements in the hydraulic transmission system are classified according to the installation mode, including plate type installation valve, superposition type installation valve, cover plate type plug-in logic valve and threaded type plug-in valve. Among them, the valve of superposition type installation can realize one function, and through the superposition of valve with different functions, complex multi-function control can be realized.

[0004] In order to realize complex multi-function control, different function valves need to be superimposed. The more complex the function is, the more valve parts are superimposed, the larger the occupied space is, and the higher the manufacturing cost is. CONTENT OF THE UTILITY MODEL

[0005] In view of the defects in the prior art, the utility model aims at providing a hydraulic multi-functional superposition control valve, which integrates different control functions of two working chambers in the hydraulic transmission system on one superposition valve, realizes multiple control functions in the smallest installation space, and reduces the manufacturing cost.

[0006] In order to achieve the above purpose, the utility model adopts the technical scheme of a hydraulic superposition control valve, which comprises a superposition valve body, a counterbalance valve and a check valve. Threaded mounting holes are arranged on the end faces of the two ends of the superposition valve body, and the counterbalance valve and the check valve are respectively inserted into the threaded mounting holes at the two ends of the superposition valve body. The superposition valve body has two oppositely arranged mounting surfaces. A P oil port, an A oil port, a B oil port, a TA oil port and a TB oil port are arranged on the first mounting surface. A P1 oil port, an A1 oil port, a B1 oil port, a TA1 oil port and a TB1 oil port are arranged on the second mounting surface. The P oil port is in communication with the P1 oil port. The TA oil port is in communication with the TA1 oil port. The TB oil port is in communication with the TB1 oil port. The B oil port is in communication with the inlet of the check valve. The outlet of the check valve is in communication with the B1 oil port. The A oil port is in communication with the first oil port of the counterbalance valve. The second oil port of the counterbalance valve is in communication with the A1 oil port. The counterbalance valve is provided with a control oil port, and the control oil port is in communication with the B oil port.

[0007] Further, the second installation surface is installed towards the lower side, and each oil port on the second installation surface is provided with a sealing element for sealing the oil port, which is embeddedly installed in the oil hole sealing element groove on the superimposed valve body installation surface.

[0008] Further, the first oil port of the counterbalance valve is a one-way inlet and an overflow outlet, and the second oil port of the counterbalance valve is a one-way outlet and an overflow inlet.

[0009] Further, the counterbalance valve and the one-way valve are screw plug valves.

[0010] Further, the superimposed valve body is manufactured by forging and machining of carbon steel or aluminum alloy.

[0011] Further, the control circuit using the hydraulic superimposed control valve comprises a hydraulic cylinder, a working oil circuit A cavity connected to a rodless cavity of the hydraulic cylinder, and the superimposed control valve is connected to the working oil circuit A cavity through an A oil port and an A1 oil port, so that the working oil circuit A cavity is connected to the first oil port and the second oil port of the counterbalance valve; a working oil circuit B cavity connected to a rod cavity of the hydraulic cylinder, and the superimposed control valve is connected to the working oil circuit B cavity through a B oil port and a B1 oil port, so that the working oil circuit B cavity is connected to the control oil port of the counterbalance valve, a one-way valve inlet of the one-way valve and a one-way valve outlet; and the working oil circuit A cavity and the working oil circuit B cavity downstream of the superimposed control valve are connected to a hydraulic control reversing valve.

[0012] Further, the hydraulic control reversing valve has an A' oil port, a B' oil port and a P' oil port, the A' oil port is connected to the rodless cavity of the hydraulic cylinder through the working oil circuit A cavity, the B' oil port is connected to the rod cavity of the hydraulic cylinder through the working oil circuit B cavity, and the P' oil port is connected to the rod cavity of the hydraulic cylinder through the working oil circuit B cavity.

[0013] Further, the working oil circuit A cavity and the working oil circuit B cavity upstream of the superimposed control valve are connected to two control oil ports of the hydraulic control reversing valve, when the working oil circuit A cavity is filled with oil, the hydraulic control reversing valve is in a first position, the A' oil port and the P' oil port are connected, and when the working oil circuit B cavity is filled with oil, the hydraulic control reversing valve is in a second position, the A' oil port and the P' oil port are disconnected.

[0014] The hydraulic superimposed control valve has the advantages that different control functions of two working cavities in a hydraulic transmission system are integrated on one superimposed valve, various control functions are realized in the minimum installation space, and the manufacturing cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structural schematic view of the hydraulic superimposed control valve.

[0016] Figure 2 It is a first installation surface oil port distribution diagram.

[0017] Figure 3 is a second mounting surface oil port distribution diagram;

[0018] Figure 4 is a superimposed valve body internal oil passage diagram;

[0019] Figure 5 is a working oil passage A cavity oil inlet state control circuit diagram;

[0020] Figure 6 is a working oil passage A cavity oil inlet state control circuit diagram;

[0021] In the figure: 1, superimposed valve body, 101, oil hole sealing element groove, 2, counterbalance valve, 201, counterbalance valve first oil port, 202, counterbalance valve second oil port, 203, control oil port, 3, one-way valve, 301, one-way valve inlet, 302, one-way valve outlet, 4, sealing element, 5, first mounting surface, 6, second mounting surface, 7, superimposed control valve, 8, hydraulic oil cylinder, 9, hydraulic control reversing valve, 10, working oil passage A cavity, 11, working oil passage B cavity. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific embodiments of the utility model are described in detail below. In the following description, a lot of specific details are set forth in order to fully understand the utility model. However, the utility model can be implemented in many other ways different from the description herein, and those skilled in the art can make similar improvements without departing from the connotation of the utility model, so the utility model is not limited by the following disclosed specific embodiments.

[0023] Referring to the accompanying drawings Figures 1-4A hydraulic superimposed control valve, comprising a superimposed valve body 1, a counterbalance valve 2 and a check valve 3, the superimposed valve body 1 is manufactured by forging and machining of carbon steel or aluminum alloy, threaded mounting holes are arranged on the end faces of the superimposed valve body 1, the counterbalance valve 2 and the check valve 3 are threaded plug-in valve parts, the counterbalance valve 2 and the check valve 3 are respectively plugged into the threaded mounting holes on both ends of the superimposed valve body 1, the superimposed valve body 1 has two oppositely arranged mounting surfaces, a first mounting surface 5 is provided with P oil port, A oil port, B oil port, TA oil port and TB oil port, a second mounting surface 6 is provided with P1 oil port, A1 oil port, B1 oil port, TA1 oil port and TB1 oil port, the P oil port is in communication with the P1 oil port, the TA oil port is in communication with the TA1 oil port, the TB oil port is in communication with the TB1 oil port, the B oil port is in communication with the check valve inlet 301, the check valve outlet 302 is in communication with the B1 oil port, the A oil port is in communication with the first oil port of the counterbalance valve, the first oil port of the counterbalance valve 2 serves as a one-way inlet and an overflow outlet, the second oil port of the counterbalance valve is in communication with the A1 oil port, the second oil port 202 of the counterbalance valve serves as a one-way outlet and an overflow inlet, the counterbalance valve is provided with a control oil port 203, the control oil port 203 is in communication with the B oil port.

[0024] In the embodiment, the first mounting surface 5 is installed towards the upper side, and the second mounting surface 6 is installed towards the lower side, each oil port on the second mounting surface 6 installed towards the lower side is provided with a sealing piece 4 for sealing the oil port, and the sealing piece 4 is embeddedly installed in the oil hole sealing piece groove of the mounting surface of the superimposed valve body. The sealing piece 4 used in the embodiment is a sealing ring.

[0025] The hydraulic multifunctional superimposed control valve of the embodiment is composed of a superimposed valve body 1, threaded plug-in valve parts and sealing pieces 4.

[0026] (1) Superimposed valve body:

[0027] The superimposed valve body 1 is manufactured by forging and machining of carbon steel or aluminum alloy, the valve body has multiple specifications, and meets the use requirements of different parameter hydraulic transmission systems. The upper and lower mounting surfaces 5 and 6 of the valve body meet the GB / T2514-2008 "Hydraulic Transmission Four Oil Port Direction Control Valve Mounting Surface" standard. Two threaded plug-in valve mounting holes are processed on both sides of the valve body according to requirements, and multiple oil channels are processed inside.

[0028] (2) Threaded plug-in valve parts:

[0029] According to different control requirements of two working cavities, threaded plug-in valve parts meeting the control requirements are installed on both ends of the valve body. As shown in the figure, a counterbalance valve 2 is installed in one working cavity, and a check valve 3 is installed in the other working cavity.

[0030] (3) Sealing piece:

[0031] The sealing member 4 is installed in the oil hole sealing groove of the lower side mounting surface of the valve body, and seals the oil hole when the valve member is stacked and installed, thereby preventing oil leakage.

[0032] The control circuit using the hydraulic superimposed control valve comprises a hydraulic cylinder 8, a working oil path A cavity connected to a rodless cavity of the hydraulic cylinder 8, and the superimposed control valve 7 connected to the working oil path A cavity 10 through A and A1 oil ports, so that the working oil path A cavity 10 is connected to the first oil port 201 and the second oil port 202 of the counterbalance valve; a working oil path B cavity 11 connected to a rod cavity of the hydraulic cylinder 8, and the superimposed control valve 7 connected to the working oil path B cavity 11 through B and B1 oil ports, so that the working oil path B cavity 11 is connected to the control oil port 203 of the counterbalance valve, the one-way valve inlet 301 and the one-way valve outlet 302 of the one-way valve; and the working oil path A cavity 10 and the working oil path B cavity 11 downstream of the superimposed control valve 7 are connected to the hydraulic control reversing valve 9.

[0033] Further, the working oil path A cavity 10 and the working oil path B cavity 11 upstream of the superimposed control valve are connected to two control oil ports of the hydraulic control reversing valve 9, the working oil path A cavity 10 is filled with oil, the hydraulic control reversing valve is in the first position, the A' oil port and the P' oil port are connected, the working oil path B cavity 11 is filled with oil, the hydraulic control reversing valve 9 is in the second position, and the A' oil port and the P' oil port are disconnected.

[0034] Referring to the accompanying drawings Figures 5-6 The hydraulic multifunctional superimposed control valve is a special-purpose superimposed valve, which is matched with the hydraulic control reversing valve to realize differential control and load holding functions of the hydraulic cylinder.

[0035] When the working oil path A cavity is filled with high-pressure oil, the control oil drives the hydraulic control reversing valve 9 to work at the left position, the A' oil port and the P' oil port are connected, and the hydraulic cylinder moves upward under the action of differential force; when the oil filling is stopped, the counterbalance valve 2 locks the working oil path A cavity 10, and the one-way valve locks the working oil path B cavity 11, so that the hydraulic cylinder 8 keeps the working position; when the working oil path B cavity 11 is filled with high-pressure oil, the control oil port 203 is high in pressure, the counterbalance valve 2 is opened, the control oil drives the hydraulic control reversing valve 9 to work at the right position, the A' oil port and the P' oil port are disconnected, the rod cavity is high in pressure and the rodless cavity is low in pressure, and the hydraulic cylinder is retracted downward.

[0036] It should be noted that the parts not described in detail in the utility model are prior art.

[0037] In the present application, the terms "first", "second" are used only for descriptive purposes and should not be construed as indicating or implying relative importance or an indicated number of technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0038] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication or interaction relationship of two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] In the present application, unless otherwise specifically defined and limited, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be indirectly contacted through an intermediate medium. Moreover, the first feature "above", "above" and "above" of the second feature can be the first feature directly above or obliquely above the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" of the second feature can be the first feature directly below or obliquely below the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0040] It should be noted that when an element is referred to as "fixed to" or "provided on" another element, it can be directly on another element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in this paper are only for illustrative purposes, and do not indicate the only implementation.

[0041] The above is only the best embodiment of the present application. Obviously, the present application is not limited to the above embodiments, and there can be many variations. All variations that can be directly derived or inferred from the content disclosed in the present application by those skilled in the art should be considered as the protection scope of the present application.

Claims

1. A hydraulic superimposed control valve characterized by: The superimposed valve body is provided with threaded mounting holes on the end faces of two ends respectively, and the counterbalance valve and the one-way valve are respectively inserted into the threaded mounting holes on the two ends of the superimposed valve body.

2. A hydraulic piloting valve according to claim 1, characterized in that: The second mounting face is installed towards the lower side, and each oil port on the second mounting face is provided with a sealing element for sealing the oil port, which is embeddedly installed in the oil hole sealing element groove of the mounting face of the superimposed valve body.

3. The hydraulic piloted control valve according to claim 1, wherein: The first oil port of the counterbalance valve is a one-way inlet and an overflow outlet; and the second oil port of the counterbalance valve is a one-way outlet and an overflow inlet.

4. The hydraulic piloted control valve of claim 1, wherein: The counterbalance valve and the one-way valve are threaded plug-in valve parts.

5. The hydraulic piloted control valve of claim 1, wherein: The superimposed valve body is manufactured by forging carbon steel or aluminum alloy.

6. A control circuit for a hydraulic superimposed control valve according to any one of claims 1 to 5, characterised in that: The working oil circuit A cavity is connected to the rodless cavity of the hydraulic cylinder, and the superimposed control valve is connected to the working oil circuit A cavity through the A oil port and the A1 oil port, so that the working oil circuit A cavity is connected to the first oil port and the second oil port of the counterbalance valve; the working oil circuit B cavity is connected to the rod cavity of the hydraulic cylinder, and the superimposed control valve is connected to the working oil circuit B cavity through the B oil port and the B1 oil port, so that the working oil circuit B cavity is connected to the control oil port of the counterbalance valve, the one-way valve inlet of the one-way valve and the one-way valve outlet; the working oil circuit A cavity and the working oil circuit B cavity downstream of the superimposed control valve are connected to the hydraulic control reversing valve.

7. A control circuit for a hydraulic piloted control valve according to claim 6, characterized in that: The hydraulic control reversing valve has an A' oil port, a B' oil port and a P' oil port, the A' oil port is connected to the rodless cavity of the hydraulic cylinder through the working oil circuit A cavity, the B' oil port is connected to the rod cavity of the hydraulic cylinder through the working oil circuit B cavity, and the P' oil port is connected to the rod cavity of the hydraulic cylinder through the working oil circuit B cavity.

8. A control circuit for a hydraulic piloted control valve according to claim 7, characterized in that: The working oil circuit A cavity and the working oil circuit B cavity upstream of the superimposed control valve are connected to two control oil ports of the hydraulic control reversing valve, when the working oil circuit A cavity is filled with oil, the hydraulic control reversing valve is in a first position, the A' oil port and the P' oil port are connected, and when the working oil circuit B cavity is filled with oil, the hydraulic control reversing valve is in a second position, the A' oil port and the P' oil port are disconnected.

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