External control oil supplementing valve device capable of achieving rapid unloading

Abstract

An external control oil supplementing valve device capable of achieving rapid unloading comprises a valve body, the oil inlet end of the valve body is connected with a hydraulic pump through a one-way valve set, the valve body is connected with an oil cylinder, an oil supplementing valve set is arranged between a rod cavity of the oil cylinder and an oil tank, the control end of the oil supplementing valve set is connected with the oil tank through an electromagnetic valve, and a throttling hole is formed in the oil supplementing valve set. The throttling hole is communicated with the control end of the oil supplementing valve set and a rod cavity of the oil cylinder, and the control end of the oil supplementing valve set is connected with an oil tank through an electromagnetic valve. According to the external control oil supplementing valve device capable of achieving rapid unloading, the oil supplementing valve set is additionally arranged on the valve body of the main valve, the control end of the oil supplementing valve set is connected with the electromagnetic valve, the electromagnetic valve is controlled to be opened according to needs, the problem that an oil cylinder sucks air under the extreme working condition can be avoided, the function of buffering oil supplementing can be achieved, the requirement for rapid unloading under high pressure and large flow can be met, and the service life of the oil supplementing valve is prolonged. And the safety is better.

Description

TECHNICAL FIELD

[0001] The utility model relates to engineering machinery technical field, concretely is a kind of external control oil supplement valve device capable of quick unloading. BACKGROUND

[0002] In the boom operating system of large-tonnage loader, the loader is widely used in the occasion of narrow work site, uneven ground and frequent switching of working device. The quality of the boom operating system directly determines the performance of the whole machine. There are many methods to achieve quick unloading of the oil cylinder at present, but most of them have complex structure and are prone to failure.

[0003] In the prior art, without changing the original configuration, an external control sequence valve is added, which can realize the floating position function through quick unloading of the valve core without changing other functions. However, the floating position function is mainly realized by the external hydraulic control sequence valve, which cannot be triggered at any time, and the structure is complex and not easy to maintain. Moreover, the problem of easy air absorption of oil (i.e. oil supplement function) in high-speed operation condition of the oil cylinder is not considered. SUMMARY

[0004] The technical problem to be solved by the utility model is to overcome the shortcomings of the prior art, and to provide an external control oil supplement valve device capable of quick unloading, which has simple structure and good effect.

[0005] The utility model is realized by the following technical scheme: an external control oil supplement valve device capable of quick unloading, comprising a valve body, the oil inlet end of the valve body is connected together with a hydraulic pump through a one-way valve group, the valve body is connected with an oil cylinder, a rod cavity of the oil cylinder is provided with an oil supplement valve group between the oil tank, the control end of the oil supplement valve group is connected together with the oil tank through a solenoid valve, the oil supplement valve group is provided with a throttle hole, the throttle hole is connected with the control end of the oil supplement valve group and the rod cavity of the oil cylinder, and the control end of the oil supplement valve group is connected with the oil tank through a solenoid valve.

[0006] Further, the valve body is further provided with a main overflow valve, and the main overflow valve is connected with the hydraulic pump and the oil tank.

[0007] The main valve of the valve body is a three-position four-way hydraulic control valve, and the two ends of the main valve are two hydraulic control ends.

[0008] The oil supplement valve group comprises a cartridge valve, the control end of the cartridge valve comprises a spring end and a hydraulic control end, and the two main channels of the cartridge valve are connected with the rod cavity of the oil cylinder and the oil tank respectively.

[0009] The solenoid valve is a two-position two-way electromagnetic reversing valve.

[0010] The valve body is provided with a main valve core, and the oil supplement valve group, the one-way valve group and the main overflow valve are arranged on the valve body.

[0011] The front end of the valve core of the oil supplement valve group is provided with a chamfer.

[0012] The valve body spring control end of the oil supplement valve group is provided with a gasket.

[0013] The utility model has the following advantages: the external control oil supplement valve device of the utility model can unload quickly, an oil supplement valve group is added on the valve body of the main valve, the control end of the oil supplement valve group is connected with the electromagnetic valve, the electromagnetic valve is controlled to open according to the need, the problem of cylinder air suction under extreme working conditions can be avoided, the function of buffer oil supplement can be played, the demand of quick unloading under high pressure and large flow can be satisfied, and the safety is better. BRIEF DESCRIPTION OF DRAWINGS

[0014] The accompanying drawings are part of the utility model and serve to provide a further understanding of the utility model, the illustrative embodiments of the utility model and the description thereof serve to explain the utility model, but do not constitute improper limitation on the utility model. Obviously, the drawings in the following description are only some embodiments, and other drawings can be obtained according to the drawings without creative labor for ordinary skilled in the art.

[0015] In the drawings:

[0016] Figure 1 It is the hydraulic principle diagram of the utility model;

[0017] Figure 2 It is the structure schematic view of the valve body in the neutral position of the utility model;

[0018] Figure 3 It is the structure schematic view of the valve body in the working position of the utility model.

[0019] In the drawings: 1, valve body, 2, main valve core, 3, end cap assembly, 4, oil supplement valve group, 5, one-way valve group, 6, main overflow valve, 7, hydraulic pump, 8, oil tank, 9, oil cylinder, 10, electromagnetic valve.

[0020] It should be noted that these drawings and textual descriptions are not intended to limit the scope of the concept of the utility model in any way, but to illustrate the concept of the utility model to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the utility model embodiment more clear, the technical scheme in the embodiment will be clearly and completely described below in conjunction with the drawings in the utility model embodiment, and the following embodiments are used to illustrate the utility model, but not to limit the scope of the utility model.

[0022] In the description of the utility model, it needs to explain, the term "upper", "lower", "front", "back", "left", "right", "vertical", "inner", "outer" and so on indicate the orientation or position relation based on the orientation or position relation shown in the drawing, just is for the convenience of describing the utility model and simplifying the description, and is not indicate or imply that the device or element must have a particular orientation, construct and operate in a particular orientation, therefore cannot be understood as the limitation to the utility model.

[0023] In the description of the utility model, it needs to explain, unless another explicit provision and limitation, the term "installation", "connection", "connect" should do the broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected, can be mechanical connection, also can be electrical connection, can be directly connected, also can be indirectly connected through the intermediate medium.

[0024] As Figures 1 to 3 The utility model discloses an external control oil supplementing valve device that can quickly unload, which comprises a valve body 1, the oil inlet end of the valve body 1 is connected together with a hydraulic pump 7 through a one-way valve group 5, the valve body 1 is connected with a cylinder 9, a rod cavity of the cylinder 9 is provided with an oil supplementing valve group 4 between an oil tank 8, the control end of the oil supplementing valve group 4 is connected together with the oil tank 8 through a solenoid valve 10, the oil supplementing valve group 4 is provided with a throttle hole, the throttle hole is communicated with the control end of the oil supplementing valve group 4 and the rod cavity of the cylinder 9, and the control end of the oil supplementing valve group 4 is connected with the oil tank 8 through the solenoid valve 10.The utility model discloses an external control oil supplementing valve device that can quickly unload, the valve body is connected with the hydraulic pump and the cylinder, the oil inlet end of the valve body is provided with the one-way valve group connected with the hydraulic pump, which is used for guaranteeing the safety of system operation and the hydraulic pump, the oil inlet end of the rod cavity of the cylinder is provided with the oil supplementing valve group, the oil supplementing valve group is connected with the rod cavity of the cylinder and the oil tank, the oil supplementing valve group is provided with the throttle hole, the throttle hole is communicated with the rod cavity of the cylinder and the control end of the oil supplementing valve, the control end of the oil supplementing valve group is combined together by the spring and the hydraulic control end, the hydraulic control end is connected with the oil tank through the solenoid valve, the opening and closing of the solenoid valve are controlled according to the requirement, the pressure of the control end of the oil supplementing valve group is adjusted, wherein, the opening and closing of the oil supplementing valve group are determined by the control end pressure and the pressure of the rod cavity of the cylinder, the oil supplementing valve group is in the normally closed state when the system normally operates, the oil supplementing valve group opens when the rod cavity of the cylinder is in the negative pressure state due to special circumstances, the rod cavity of the cylinder is supplemented with oil from the oil tank, the rod cavity of the cylinder is relieved to the oil tank when the pressure of the rod cavity of the cylinder is too large, the same as the oil supplementing valve group, realizing the protection of the system under different working conditions, the utility model realizes the quick unloading of the boom cylinder of the loader under the emergency condition through the remote control of the solenoid valve opening and closing, increases the oil supplementing function on the basis of not changing the overall structure of the main valve, and has the advantages of simple structure, good universality, high reliability and the like.

[0025] AsFigures 1 to 3 The illustrated device is an externally controlled oil replenishment valve capable of rapid unloading. The valve body 1 also includes a main relief valve 6, which connects a hydraulic pump 7 to an oil tank 8. This device incorporates a main relief valve to control the maximum pressure supplied, thereby maintaining stable system operation and extending equipment lifespan.

[0026] like Figures 1 to 3 The illustrated device is an externally controlled oil replenishment valve capable of rapid unloading. The main valve of the valve body 1 is a three-position four-way hydraulic control valve, with two hydraulic control terminals at both ends. The main valve of this invention is a hydraulic control valve, and reversing is achieved through the hydraulic control terminals.

[0027] like Figures 1 to 3 The invention discloses an externally controlled oil replenishing valve device capable of rapid unloading. The oil replenishing valve assembly 4 includes a cartridge valve, the control end of which includes a spring end and a hydraulic control end. The two main channels of the cartridge valve are respectively connected to the rod chamber of the cylinder 9 and the oil tank 8. The main body of the oil replenishing valve assembly of this invention is a cartridge valve, and the control end is jointly controlled by a spring and hydraulic oil. The pressure at the control end can be adjusted by changing the pressure of the hydraulic oil at the hydraulic control end. The opening of the oil replenishing valve is determined based on the pressure in the rod chamber of the cylinder, the pressure in the oil tank, the spring pressure, and the pressure inside the cartridge valve, thereby replenishing oil or relieving pressure in the system, which is safe and effective.

[0028] like Figure 1 The invention relates to an externally controlled oil replenishment valve device capable of rapid unloading. The solenoid valve 10 is a two-position, two-way solenoid directional valve. The hydraulically controlled end of the oil replenishment valve assembly of this invention is controlled by a solenoid valve. Using the solenoid valve enables remote electrically controlled unloading, offering wide applicability and ease of use.

[0029] like Figures 2 to 3 The diagram illustrates an externally controlled oil replenishing valve device capable of rapid unloading. The valve body 1 contains a main valve core 2. An oil replenishing valve assembly 4, a one-way valve assembly 5, and a main relief valve 6 are mounted on the valve body 1. End cap assemblies 3 are also provided at both ends of the valve body. The front end of the valve core in the oil replenishing valve assembly 4 is chamfered. The chamfered front end of the oil replenishing valve assembly in this invention facilitates the application of high-pressure oil to the chamfer, thereby moving the valve core.

[0030] like Figures 2 to 3 The invention illustrates an externally controlled oil replenishing valve device capable of rapid unloading. The valve body spring control end of the oil replenishing valve assembly 4 is equipped with a gasket. This invention allows for the addition or removal of gaskets from the oil replenishing valve spring as needed, thereby adjusting the displacement of the oil replenishing valve core and the spring pre-compression, thus changing the opening pressure of the oil replenishing valve core. This makes it suitable for more operating conditions and saves energy and reduces costs.

[0031] Combined with appendix Figures 1 to 3 The principle of this utility model is described in detail below:

[0032] When the main valve core 2 is in the neutral position, the main valve is not conducted, and the working oil ports A and B are disconnected with the high-pressure oil P, at this time, the oil cylinder is in the locked state.

[0033] When the control end b port is connected with the pilot oil, the main valve core is reversed, at this time, the rod cavity of the oil cylinder is connected with the hydraulic pump, the high-pressure oil output by the hydraulic pump enters the rod cavity B cavity of the oil cylinder and the oil supplement valve group through the one-way valve group 5, as shown in the figure, that is, P1=P, at this time, according to whether the rod cavity of the oil cylinder needs to be depressurized, two working states are divided: Figure 3

[0034] 1. When the rod cavity of the oil cylinder does not need to be depressurized, the solenoid valve is not electrified, the external control solenoid valve is not reversed, the control end oil of the oil supplement valve, that is, the internal oil is connected with the B cavity of the oil cylinder through the throttle hole, at this time, P1=P B =P2, the high-pressure oil is normally supplied to the oil cylinder, if the boom oil cylinder is suddenly overloaded or high-speed operation, the B cavity oil is easy to be vacuumed to produce negative pressure, the two sides of the contact part of the front end of the oil supplement valve core and the valve body are respectively the hydraulic oil of the oil tank and the hydraulic oil of the B cavity, under the action of negative pressure, the front end of the oil supplement valve core generates a pressure difference, the value of the pressure difference is P B +P T , which acts on the oil supplement valve core, since P B +P T ≥P2+P 弹簧 , therefore, the valve core of the oil supplement valve is pushed, the oil supplement valve group is opened, the oil cylinder is connected with the oil tank T port oil through the valve body B cavity, the B cavity directly sucks the oil from the T port, plays a buffering and oil supplement role, and prevents the oil cylinder from being deformed by vacuuming;

[0035] 2. When the rod cavity of the oil cylinder needs to be depressurized, the solenoid valve is electrified, the external control solenoid valve is reversed, and the control end of the oil supplement valve is connected with the oil tank, since the throttle hole exists, at this time, P1=P B >P2, therefore, the pressure on the outside of the oil supplement valve core is greater than the pressure in the inside of the oil supplement valve core, that is, P B +P T ≥P2+P 弹簧 , the valve core of the oil supplement valve is pushed, the oil supplement valve group is opened, the B cavity of the oil cylinder is directly connected with the T port in the valve body, so that the oil cylinder is quickly unloaded, and the system oil circuit is protected.

[0036] The external control oil supplement valve device capable of quickly unloading can realize the function of buffering and oil supplement under extreme working conditions, prevents the oil cylinder from being deformed by vacuuming, can meet the demand of quick unloading under high-pressure and large flow, is safer, can realize remote electric control unloading through the external solenoid valve, is convenient and fast, can change the opening sensitivity and pressure range of the oil supplement valve through adjusting the size of the throttle hole and the thickness of the spring gasket, and simultaneously, the structure of the external control oil supplement valve only needs to increase the oil supplement valve and the external control solenoid valve on the basis of the main valve, is simple and reliable, and is easy to maintain.

[0037] ​In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the application can be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

[0038] In addition, those skilled in the art will understand that, although some embodiments described herein include some, but not other, characteristics of the described embodiments, combinations of different described features can also be used in other embodiments. For example, in the above embodiments, the technical solutions known to those skilled in the art and the technical problems to be solved by the present application can be used in a combined manner.

[0039] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed as above with reference to the preferred embodiments, it is not intended to limit the present application, and any person skilled in the art can make minor changes or modifications to the above-mentioned technical content without departing from the scope of the technical solutions of the present application, and any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present application still belong to the scope of the present application.

Claims

1. An externally controlled oil replenishment valve device capable of rapid unloading, characterized in that: The system includes a valve body (1), the oil inlet of which is connected to a hydraulic pump (7) via a check valve assembly (5). The valve body (1) is connected to a cylinder (9). A replenishing valve assembly (4) is provided between the rod chamber of the cylinder (9) and the oil tank (8). The control end of the replenishing valve assembly (4) is connected to the oil tank (8) via a solenoid valve (10). The replenishing valve assembly (4) is provided with a throttle orifice, which connects the control end of the replenishing valve assembly (4) and the rod chamber of the cylinder (9). The control end of the replenishing valve assembly (4) is connected to the oil tank (8) via a solenoid valve (10).

2. The externally controlled oil replenishing valve device for rapid unloading as described in claim 1, characterized in that: The valve body (1) is also provided with a main relief valve (6), which is connected to the hydraulic pump (7) and the oil tank (8).

3. The externally controlled oil replenishing valve device for rapid unloading as described in claim 1, characterized in that: The main valve of the valve body (1) is a three-position four-way hydraulic control valve, and the two ends of the main valve are two hydraulic control ends.

4. The externally controlled oil replenishing valve device for rapid unloading as described in claim 1, characterized in that: The oil replenishment valve assembly (4) includes a cartridge valve. The control end of the cartridge valve includes a spring end and a hydraulic control end. The two main channels of the cartridge valve are respectively connected to the rod chamber of the oil cylinder (9) and the oil tank (8).

5. The externally controlled oil replenishing valve device for rapid unloading as described in claim 1, characterized in that: The solenoid valve (10) is a two-position, two-way solenoid directional valve.

6. The externally controlled oil replenishing valve device for rapid unloading as described in claim 1, characterized in that: The valve body (1) is provided with a main valve core (2), and the oil replenishment valve group (4), the one-way valve group (5) and the main relief valve (6) are arranged on the valve body (1).

7. The externally controlled oil replenishing valve device for rapid unloading as described in claim 6, characterized in that: The valve core of the oil replenishment valve assembly (4) has a chamfer at the front end.

8. The externally controlled oil replenishing valve device for rapid unloading as described in claim 6, characterized in that: The valve body spring control end of the oil replenishment valve assembly (4) is provided with a gasket.

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