Hydraulic combination valve

Abstract

A hydraulic combination valve includes an oil source switching system and an auxiliary control system, which are connected in series. The oil source switching system includes a first oil source switching system and a second oil source switching system, and the first oil source switching system and the second oil source switching system are connected in parallel. The first oil source switching system includes a first oil source switching valve, which is a two-position two-way solenoid valve; the second oil source switching system includes a second oil source switching valve, which is a two-position three-way solenoid valve. This hydraulic combination valve has a compact structure, is safe and reliable, and can meet the hydraulic oil circuit layout with different flow requirements.

Description

Technical Field

[0001] The invention relates to a valve, in particular to a hydraulic combination valve, belonging to the technical field of engineering machinery. Background Art

[0002] Today, construction machinery is no longer a machine that works for a single working condition. For example, in addition to excavating earthwork, excavators can be equipped with breakers and hydraulic shears to become building demolition tools. Another example is that loaders, which are usually used as scraper machinery, have been widely used abroad as mobile oil sources and equipped with various attachments to achieve multi-functional operations. Currently, it is known that loaders can be equipped with up to 120 kinds of attachments. Due to their different working conditions, the flow rate of mobile equipment (loaders, excavators) required by various attachments varies greatly. At present, construction machinery does not consider the diversification of attachments, and the output hydraulic oil source is single, which limits the application scope of construction machinery. Summary of the invention

[0003] Purpose of the invention: The present invention aims to overcome the shortcomings of existing hydraulic valves and provide a safe, reliable, and multi-oil source combination valve.

[0004] Technical solution: A hydraulic combination valve includes an oil source switching system and an auxiliary control system, which are connected in series. The oil source switching system includes a first oil source switching system and a second oil source switching system, and the first oil source switching system and the second oil source switching system are connected in parallel. The first oil source switching system includes a first oil source switching valve, which is a two-position two-way solenoid valve; the second oil source switching system includes a second oil source switching valve, which is a two-position three-way solenoid valve. Therefore, by controlling the on and off of the two-position three-way solenoid valve and the two-position two-way solenoid valve, three types of flow can enter the auxiliary control system to meet the different flow requirements of various accessories.

[0005] Preferably, in order to reduce the number of hydraulic components in the oil circuit control arrangement and ensure the reliability of the oil source, the second oil source switching system also includes an oil source one-way valve and an overflow valve, and the oil passing through the oil source one-way valve flows to the second oil source switching valve; the overflow valve sets the pressure threshold value of the second oil source switching system.

[0006] Preferably, to further ensure the reliability of the oil source, the second oil source switching system further includes an oil circuit one-way valve, and the oil passing through the oil source one-way valve flows to the second oil source switching valve and the oil circuit one-way valve in sequence.

[0007] Preferably, in order to further reduce the number of hydraulic components in the oil circuit control arrangement, the hydraulic combination valve further includes two oil return ports, and the two oil return ports are connected.

[0008] Preferably, in order to meet the requirements of controlling different accessories, the auxiliary control system includes a first auxiliary control valve and a second auxiliary control valve; the first auxiliary control valve is a two-position three-way solenoid valve; the second auxiliary control valve is a three-position four-way solenoid valve.

[0009] Beneficial effects: The hydraulic combination valve of the present invention has a compact structure, is safe and reliable, and can meet the hydraulic oil circuit layout with different flow requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is Example 1 of the hydraulic combination valve of the present invention;

[0011] Figure 2 This is Example 2 of the hydraulic combination valve of the present invention;

[0012] Figure 3 This is Example 3 of the hydraulic combination valve of the present invention;

[0013] Figure 4 This is Example 4 of the hydraulic combination valve of the present invention;

[0014] Figure 5 This is Example 5 of the hydraulic combination valve of the present invention. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and preferred embodiments. The preferred embodiments are only for illustrating the present invention rather than for limiting the scope of protection of the present invention.

[0016] like Figure 1As shown, a hydraulic combination valve includes an oil source switching system 1, an auxiliary joint control system 2 and two oil return ports 3, wherein the oil source switching system 1 and the auxiliary joint control system 2 are connected in series, and the two oil return ports 3 are connected. The oil source switching system 1 includes a first oil source switching system 11 and a second oil source switching system 12, wherein the first oil source switching system 11 and the second oil source switching system 12 are connected in parallel. The first oil source switching system 11 includes a first oil source switching valve 111, which is a two-position two-way solenoid valve, and the oil inlet is port A. The second oil source switching system 12 includes a second oil source switching valve 121, an oil source check valve 122, a relief valve 123 and an oil circuit check valve 124, and the oil inlet is port H. The second oil source switching valve 121 is a two-position three-way solenoid valve, and the oil passing through the oil source check valve 122 flows to the second oil source switching valve 121 and the oil circuit check valve 124 in sequence. The overflow valve 123 sets the pressure threshold of the second oil source switching system 12. The auxiliary joint control system 2 includes a first auxiliary joint control valve 21 and a second auxiliary joint control valve 22; the first auxiliary joint control valve 21 is a two-position three-way solenoid valve; the second auxiliary joint control valve 22 is a three-position four-way solenoid valve. Port F is the auxiliary joint return oil port to avoid the use of the return oil joint. Port G is the return oil port of the hydraulic combination valve, and the oil from the auxiliary joint return oil eventually flows out through port G.

[0017] The second oil source switching valve 121 controls whether the hydraulic oil source of port H is involved in the work. Figure 1 When the hydraulic oil at port H flows out directly through port G when the second oil source switching valve 121 is activated, the oil at port H enters the oil circuit of the system. The maximum pressure of the hydraulic oil at port H is set by the relief valve 123. When the pressure at port H exceeds the pressure set by the relief valve 123, the hydraulic oil at port H flows to port G through the relief valve 123. The first oil source switching valve 111 controls whether the hydraulic oil at port A participates in the work. When it is in Figure 1 When in the position shown, the hydraulic oil at port A does not enter the oil circuit. When the first oil source switching valve 111 is activated, the oil at port A enters the oil circuit of the system. The oil at port A and the oil at port H can both enter the first auxiliary joint control valve 21 and the second auxiliary joint control valve 22. Therefore, by controlling the on-off of the first oil source switching valve 111 and the second oil source switching valve 121, three flow rates can be realized to enter the first auxiliary joint control valve 21 and the second auxiliary joint control valve 22, that is, the oil at port A enters, the oil at port H enters, and the oil at port A and the oil at port H enter together. The first auxiliary joint control valve 21, as a flow switching valve, can realize the selection of switching the hydraulic oil to port B or port C. The second auxiliary joint control valve 22 can realize the mode in which the hydraulic oil flows to port D and the oil returns to port E, and the hydraulic oil flows to port E and the oil returns to port D.

[0018] like Figure 2As shown, the oil circuit check valve 124 is removed to realize that the maximum pressure of the oil at ports A and H is controlled by the relief valve 123. When the first oil source switching valve 111 and the second oil source switching valve 121 are energized, the oil at ports A and H merge. When the system pressure is higher than the pressure set by the relief valve 123, the oil at ports A and H simultaneously flows to port G after the relief valve 123 is opened. In addition, Figure 3 , Figure 4 , Figure 5 As shown, in order to cooperate with different accessories, the auxiliary joint control system 2 may further include a third auxiliary joint control valve 23 and the like.

[0019] Although the present invention has been described in detail above in conjunction with the embodiments, those skilled in the art will appreciate that the embodiments may be modified or altered without departing from the spirit of the present invention and still fall within the protection scope of the present invention.

Claims

1. A hydraulic combination valve, comprising an oil source switching system (1) and an auxiliary control system (2), the two being connected in series, characterized in that: The oil source switching system (1) comprises a first oil source switching system (11) and a second oil source switching system (12), wherein the first oil source switching system (11) and the second oil source switching system (12) are connected in parallel; The first oil source switching system (11) comprises a first oil source switching valve (111), which is a two-position two-way solenoid valve; the second oil source switching system (12) comprises a second oil source switching valve (121), which is a two-position three-way solenoid valve; The second oil source switching system (12) further comprises an oil source one-way valve (122) and a relief valve (123), and the oil passing through the oil source one-way valve (122) flows to the second oil source switching valve (121); the relief valve (123) sets the pressure threshold value of the second oil source switching system (12); The hydraulic combination valve further comprises two oil return ports (3), and the two oil return ports (3) are interconnected; The two oil return ports (3) are port F and port G. Port F is the auxiliary oil return port to avoid the use of an oil return joint, and port G is the oil return port of the hydraulic combination valve. The oil, together with the auxiliary oil return oil, eventually flows out through port G.

2. The hydraulic combination valve according to claim 1, characterized in that: The second oil source switching system (12) further comprises an oil circuit one-way valve (124), and the oil passing through the oil source one-way valve (122) flows to the second oil source switching valve (121) and the oil circuit one-way valve (124) in sequence.

3. The hydraulic combination valve according to any one of claims 1 or 2, characterized in that: The auxiliary control system (2) comprises a first auxiliary control valve (21) and a second auxiliary control valve (22); the first auxiliary control valve (21) is a two-position three-way solenoid valve; and the second auxiliary control valve (22) is a three-position four-way solenoid valve.

Images