Hydraulic feedback control valve of reversing valve

Abstract

An oil inlet cavity (A), a control cavity (B) and a locking rod cavity (C) are arranged in a valve body (8), the oil inlet cavity (A) is respectively communicated with the control cavity (B) and the locking rod cavity (C), threads are arranged at the upper end of the oil inlet cavity (A) to be connected with an oil pipe, and threads are arranged at the lower end of the oil inlet cavity (A) to be connected with a dustproof blanking cap (7). A piston (1) and a compression spring (4) are placed in the oil inlet cavity (A), the piston (1) can move up and down in the oil inlet cavity (A), a groove used for containing a large sealing ring (2) is formed in the upper end of the piston (1), a groove used for containing a small sealing ring (5) is formed in the lower end of the piston (1), threads are arranged on the left side of the control cavity (B) and used for installing a plug (3), and a locking rod (6) in the locking rod cavity (C) is in threaded connection with a valve element of a reversing valve (10). And the valve body (8) is in threaded connection with the reversing valve (10). The pressure control device is high in universality, and accurate pressure control can be achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of engineering vehicles, and in particular relates to a reversing valve hydraulic feedback control valve. Background Art

[0002] Currently, most reversing valves are automatically controlled by 24V solenoid coils. For special vehicles in certain operating environments where the oil pump does not need to operate continuously, a device with hydraulic feedback can be installed to control the disconnection and connection of the oil pump coupling to save fuel and facilitate control. Utility Model Content

[0003] The utility model uses pressure control to keep the reversing valve in a certain working state. This mechanism can realize remote hydraulic control of the reversing valve, thereby changing the hydraulic oil circuit and unloading the pressure of a branch circuit to play a protective role.

[0004] The utility model is realized by the following technical solutions:

[0005] A reversing valve hydraulic feedback control valve, comprising a piston 1, a large sealing ring 2, a plug 3, a compression spring 4, a small sealing ring 5, a locking rod 6, a dustproof plug cover 7 and a valve body 8;

[0006] Three cavities are set in the valve body 8: the oil inlet cavity A, the control cavity B and the locking rod cavity C. The oil inlet cavity A is connected with the control cavity B and the locking rod cavity C respectively. The upper end of the oil inlet cavity A is provided with a thread to connect with the oil pipe, and the lower end is also provided with a thread to connect with the dust cover 7. A piston 1 and a compression spring 4 are placed in the oil inlet cavity A. The piston 1 can move up and down in the oil inlet cavity A. There is a groove for placing the large sealing ring 2 at the upper end of the piston 1, and a groove for placing the small sealing ring 5 at the lower end. A thread is provided on the left side of the control cavity B for installing the plug 3. The locking rod 6 in the locking rod cavity C is screwed to the valve core of the reversing valve 10, and the valve body 8 is screwed to the reversing valve 10 through four hexagonal cylindrical head bolts 9.

[0007] The utility model has strong versatility and can realize precise pressure control. The mechanism can be directly installed on the reversing valve, which is easy to install and realizes continuous action in a certain direction of the hydraulic pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the structure of the utility model;

[0009] Figure 2 This is a schematic diagram of the installation state of the utility model;

[0010] Figure 3 This is the hydraulic principle diagram of the utility model. DETAILED DESCRIPTION

[0011] like Figure 1-3 As shown, the utility model is a reversing valve hydraulic feedback control valve, comprising: a piston 1, a large sealing ring 2, a plug 3, a compression spring 4, a small sealing ring 5, a locking rod 6, a dustproof plug cover 7, a valve body 8, and a hexagon socket head bolt 9.

[0012] The control valve block body 8 comprises three chambers: an oil inlet chamber A, a control chamber B, and a locking rod chamber C. The oil inlet chamber A communicates with the control chamber B and the locking rod chamber C, respectively. The upper end of the oil inlet chamber A is threaded for connection to the oil pipe, while the lower end is also threaded for connection to a dust cover 7. The dust cover 7 is used to exhaust air from the valve after the piston 1 moves up and down. The piston 1 and compression spring 4 are placed in the oil inlet chamber A, allowing the piston 1 to move up and down within the oil inlet chamber A. A groove for accommodating a large sealing ring 2 is located at the upper end of the piston 1, and a groove for accommodating a small sealing ring 5 is located at the lower end.

[0013] The left side of the control cavity B is provided with a thread for installing a plug 3, which can also be used to check whether the piston 1 is stuck.

[0014] The locking rod 6 in the locking rod cavity C is screwed to the valve core of the reversing valve 10 , and the valve body 8 is screwed to the reversing valve 10 via four hexagon socket head bolts 9 .

[0015] When the reversing valves P→B and A→T are connected through the handle of the reversing valve 10, oil pressure is injected into the oil inlet PST port of the oil inlet cavity A, and the piston 1 moves downward and contacts the locking rod 6 and maintains it. When oil pressure is injected into the control port X of the control cavity B, a pressure difference is formed between the upper and lower cavities of the piston 1. Under the action of the compression spring 4, the reversing valve 10 automatically returns to the center position.

Claims

1. A reversing valve hydraulic feedback control valve, characterized by: The invention comprises a piston (1), a large sealing ring (2), a plug (3), a compression spring (4), a small sealing ring (5), a locking rod (6), a dustproof plug cover (7) and a valve body (8); three cavities are arranged in the valve body (8): an oil inlet cavity (A), a control cavity (B) and a locking rod cavity (C); the oil inlet cavity (A) is communicated with the control cavity (B) and the locking rod cavity (C) respectively; the upper end of the oil inlet cavity (A) is provided with a thread connected to the oil pipe, and the lower end is also provided with a thread connected to the dustproof plug cover ( 7), a piston (1) and a compression spring (4) are placed in the oil inlet cavity (A), and the piston (1) can move up and down in the oil inlet cavity (A). A groove for placing a large sealing ring (2) is provided at the upper end of the piston (1), and a groove for placing a small sealing ring (5) is provided at the lower end. A thread is provided on the left side of the control cavity (B) for installing a plug (3). The locking rod (6) in the locking rod cavity (C) is screwed to the valve core of the reversing valve (10), and the valve body (8) is screwed to the reversing valve (10).

2. The reversing valve hydraulic feedback control valve according to claim 1, characterized in that: The valve body (8) is screwed to the reversing valve (10) via four hexagon socket head bolts (9).

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