Pilot-operated type hydraulic balance valve

Abstract

The utility model relates to the technical field of balance valves, and discloses a pilot-operated type hydraulic balance valve which comprises a valve body, a main valve core, a throttle valve and an overflow valve, and the main valve core, a one-way throttle valve and the overflow valve are matched with one another. When the execution element descends, the one-way throttle valve can control the descending speed to prevent overspeed; meanwhile, the main valve element adjusts on-off and flow of an oil way according to system pressure and load conditions; and if the system pressure abnormally rises, the overflow valve can timely start overflow to protect the system safety. Through cooperative work of the components, stable control and protection of a hydraulic system can be achieved through the pilot-operated type hydraulic balance valve.

Description

TECHNICAL FIELD

[0001] The utility model relates to balanced valve technical field especially is related to a pilot type hydraulic balance valve. BACKGROUND

[0002] In the modern industrial field, hydraulic systems are widely used in various mechanical equipment, such as engineering machinery (excavators, cranes, etc.), industrial production equipment (hydraulic injection molding machines, hydraulic lifting platforms, etc.). In the operation process of these hydraulic systems, accurate control of pressure and flow is crucial, but the existing hydraulic balance valve has shortcomings in pressure control, flow regulation, etc., and an urgent need for a pilot type hydraulic balance valve. SUMMARY

[0003] The utility model provides a pilot type hydraulic balance valve to solve the problem of the existing hydraulic balance valve in prior art in pressure control, flow regulation and other aspects.

[0004] The technical problem solved by the utility model is realized by the following technical scheme:

[0005] A pilot type hydraulic balance valve, comprising:

[0006] a valve body;

[0007] a main valve core arranged in the valve cavity of the valve body;

[0008] a throttle valve installed in communication with the oil passage of the valve body at the top of the valve body;

[0009] an overflow valve installed on one side of the valve body in communication with the oil passage of the valve body.

[0010] In a specific embodiment, the valve body has an installation cavity and an overflow channel connected to the installation cavity, and the valve body has an oil port V1, an oil port V2, an oil port C1 and an oil port C2.

[0011] In a specific embodiment, the main valve core includes an adjusting valve sleeve and a pilot valve rod connected in the adjusting valve sleeve, and a one-way valve core is sleeved on the pilot valve rod.

[0012] In a specific embodiment, the adjusting valve sleeve includes a sleeve body connected to one end of the installation cavity and an adjusting end head threadedly connected to one end of the sleeve body, the adjusting end head is connected with a push end, the push end is connected with a first spring, one end of the pilot valve rod is connected with the first spring, and the sleeve body is provided with a pilot port at one end.

[0013] In one embodiment, the throttle valve includes a mounting end connected to the other end of the mounting cavity and a valve stem connected to the mounting end.

[0014] In one embodiment, the end of the valve stem extending into the mounting cavity is provided with a nozzle and a throttle opening in communication with the nozzle.

[0015] In one embodiment, the overflow valve includes a valve housing connected to one side of the valve body and a piston connected to the valve housing, the upper end of the piston being connected to a second spring, the other end of the second spring being connected to an adjusting rod, the adjusting rod being threadedly connected to the valve housing, the lower end of the valve housing being provided with a through opening in communication with the overflow passage.

[0016] The utility model has the beneficial effects that:

[0017] 1. The main valve core, the one-way throttle valve and the overflow valve cooperate with each other. When the actuator drops, the one-way throttle valve can control the dropping speed to prevent overspeeding; at the same time, the main valve core adjusts the oil passage and flow rate according to the system pressure and load condition; if the system pressure abnormally rises, the overflow valve will open the overflow in time to protect the system safety. Through the cooperative work of these components, the pilot-operated hydraulic balance valve can realize the stable control and protection of the hydraulic system.

[0018] 2. The setting of the overflow valve can effectively prevent the system pressure from being too high. When the system pressure exceeds the set value of the overflow valve, the piston moves upward against the elastic force of the second spring, the through opening at the lower end of the valve housing is opened, the excess hydraulic oil flows back to the oil tank or the low-pressure oil passage through the overflow passage, thereby protecting other elements in the system from high-pressure impact and improving the stability and reliability of the system. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment description or the prior art description. Obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without any creative labor.

[0020] Figure 1 It is a whole first visual angle structural schematic diagram of the utility model.

[0021] Figure 2 It is a whole cross section structural schematic diagram of the utility model.

[0022] Figure 3 It is Figure 2 The enlarged view of A in the middle.

[0023] Figure 4 For Figure 2 Enlarged view at B.

[0024] Figure 5 For the overall second perspective structure schematic diagram of the utility model.

[0025] Figure 6 For the hydraulic principle diagram.

[0026] In the figure: 100, valve body;110, installation cavity way;120, overflow way;101, oil port V1;102, oil port V2;103, oil port C1;104, oil port C2.

[0027] 200, main valve core;210, adjusting valve sleeve;211, sleeve body;212, adjusting end head;213, push end;214, first spring;215, pilot port;220, pilot valve rod;230, one-way valve core.

[0028] 300, throttle valve;310, installation end head;320, valve rod;321, pipe orifice;322, throttle port.

[0029] 400, overflow valve;410, valve shell;411, lead-through port;420, piston;430, second spring;440, adjusting rod. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0031] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0032] It should be noted that: similar numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0033] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0034] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0035] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0037] Referring to Figures 1-5 The utility model provides a kind of pilot operated hydraulic balance valve, comprising:

[0038] Valve body 100;

[0039] Main valve core 200, main valve core 200 is arranged in the valve cavity of valve body 100;

[0040] The throttle valve 300 is installed on the top of the valve body 100 and communicates with the oil passage of the valve body 100.

[0041] The overflow valve 400 is installed on one side of the valve body 100 and communicates with the oil passage of the valve body 100.

[0042] The main valve core, the one-way throttle valve and the overflow valve cooperate with each other. When the actuator drops, the one-way throttle valve can control the dropping speed to prevent overspeed; at the same time, the main valve core adjusts the oil passage on-off and flow according to the system pressure and load condition; if the system pressure abnormally rises, the overflow valve will open the overflow in time to protect the system safety. Through the cooperative work of these components, the pilot hydraulic balance valve can realize the stable control and protection of the hydraulic system.

[0043] As a further preferred embodiment of the above-mentioned embodiment, the valve body 100 is internally provided with an installation cavity 110 and an overflow channel 120 communicating with the installation cavity 110, and the valve body 100 is provided with an oil port V1101, an oil port V2102, an oil port C1103 and an oil port C2104.

[0044] As a further preferred embodiment of the above-mentioned embodiment, the main valve core 200 comprises a regulating valve sleeve 210 and a pilot valve rod 220 connected in the regulating valve sleeve 210, and the pilot valve rod 220 is sleeved with a one-way valve core 230.

[0045] The regulating valve sleeve 210 comprises a sleeve body 211 connected and installed at one end of the installation cavity 110 and a regulating end 212 threadedly installed at one end of the sleeve body 211, the regulating end 212 is connected with a pushing end 213, the pushing end 213 is connected with a first spring 214, one end of the pilot valve rod 220 is connected with the first spring 214, and one end of the sleeve body 211 is provided with a pilot port 215.

[0046] As a further preferred embodiment of the above-mentioned embodiment, the throttle valve 300 comprises a mounting end 310 connected at the other end of the installation cavity 110 and a valve rod 320 connected in the mounting end 310.

[0047] One end of the valve rod 320 extending into the installation cavity 110 is provided with a pipe opening 321 and a throttle opening 322, and the throttle opening 322 communicates with the pipe opening 321.

[0048] As a further preferred embodiment of the above-mentioned embodiment, the overflow valve 400 comprises a valve shell 410 connected and installed on one side of the valve body 100 and a piston 420 installed in the valve shell 410, the upper end of the piston 420 is connected with a second spring 430, the other end of the second spring 430 is connected with a regulating rod 440, the regulating rod 440 is threadedly connected on the valve shell 410, and the lower end of the valve shell 410 is provided with a guide opening 411 communicating with the overflow channel 120.

[0049] The overflow valve 400 can effectively prevent the system pressure from being too high. When the system pressure exceeds the overflow valve setting value, the piston 420 moves upward against the elastic force of the second spring 430, so that the guide opening 411 at the lower end of the valve housing 410 is opened, and the excess hydraulic oil flows back to the oil tank or low pressure oil circuit through the overflow passage 120, thereby protecting other elements in the system from high pressure impact and improving the stability and reliability of the system.

[0050] As shown in Figure 6 The working principle of the pilot hydraulic balance valve is as follows:

[0051] 1. Forward flow V1 to V2:

[0052] When hydraulic oil enters from the V1 port, the check valve opens, and the hydraulic oil can freely flow to the V2 port through the check valve core to drive the load such as a hydraulic cylinder to extend. At this time, the throttle valve does not work, and the hydraulic oil can flow smoothly.

[0053] 2. Reverse flow V2 to V1:

[0054] When the load needs to be retracted, i.e. the hydraulic oil needs to flow from the V2 port to the V1 port, the check valve core is closed. At this time, the hydraulic oil must pass through the combined circuit of the throttle valve and the overflow valve.

[0055] The throttle valve adjusts the flow of hydraulic oil, thereby controlling the speed of load retraction. The overflow valve sets an upper limit of pressure, which is 140 bar in the figure. If the pressure generated by the load due to gravity and other reasons exceeds this set value, the overflow valve opens to discharge the excess hydraulic oil back to the oil tank, preventing the load from rapidly descending, thereby playing a balancing and speed limiting role.

[0056] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. It should be understood by those skilled in the art that the utility model is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model can also have various changes and improvements, and these changes and improvements all fall within the scope of the utility model claimed. The scope of protection of the utility model is defined by the appended claims and their equivalents.

Claims

1. A pilot-operated hydraulic balance valve, characterized in that, include: Valve body (100); The main valve core (200) is disposed in the valve cavity of the valve body (100); A throttle valve (300) is installed on the top of the valve body (100) and connected to the oil passage of the valve body (100); An overflow valve (400) is installed on one side of the valve body (100) and is connected to the oil passage of the valve body (100).

2. The pilot-operated hydraulic balance valve according to claim 1, characterized in that: The valve body (100) has an installation cavity (110) and an overflow channel (120) connected to the installation cavity (110). The valve body (100) has an oil port V1 (101), an oil port V2 (102), an oil port C1 (103) and an oil port C2 (104).

3. A pilot-operated hydraulic balance valve according to claim 2, characterized in that: The main valve core (200) includes a regulating valve sleeve (210) and a pilot valve stem (220) connected in the regulating valve sleeve (210), and a one-way valve core (230) is fitted on the pilot valve stem (220).

4. A pilot-operated hydraulic balance valve according to claim 3, characterized in that: The regulating valve sleeve (210) includes a sleeve (211) connected to one end of the mounting cavity (110) and an adjusting end (212) threaded to one end of the sleeve (211). A push end (213) is connected to the adjusting end (212), and a first spring (214) is connected to the push end (213). One end of the pilot valve rod (220) is connected to the first spring (214), and a pilot port (215) is opened at one end of the sleeve (211).

5. A pilot-operated hydraulic balance valve according to claim 4, characterized in that: The throttle valve (300) includes a mounting end (310) connected to the other end of the mounting cavity (110) and a valve stem (320) connected within the mounting end (310).

6. A pilot-operated hydraulic balance valve according to claim 5, characterized in that: The valve stem (320) has a pipe port (321) and a throttling port (322) at one end that extends into the mounting cavity (110), and the throttling port (322) is connected to the pipe port (321).

7. A pilot-operated hydraulic balance valve according to claim 6, characterized in that: The overflow valve (400) includes a valve housing (410) connected to one side of the valve body (100) and a piston (420) installed inside the valve housing (410). The upper end of the piston (420) is connected to a second spring (430), and the other end of the second spring (430) is connected to an adjusting rod (440). The adjusting rod (440) is threaded onto the valve housing (410), and the lower end of the valve housing (410) is provided with a through port (411) communicating with the overflow channel (120).

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