Hand-operated direction valve

Abstract

The utility model discloses a hand-operated direction valve which comprises a valve body and a valve element which is arranged in the valve body, achieves oil way switching through axial movement and can reset automatically, and a button capable of being pressed and a sliding block driven by the button to achieve movement are arranged on the valve body. A slope surface for driving the valve element to move in the axial direction and a plane connected with the slope surface to keep the valve element fixed in the axial direction are arranged on the side, making contact with the valve element, of the sliding block; according to the technical scheme, the sliding block is driven to move through the button, the valve element is driven to move through the slope surface on the sliding block, meanwhile, the axial position of the valve element is kept through the plane, the manual reversing valve can be achieved, and due to the fact that the reversing valve is achieved by pressing the button, the operation habit of an operator using an emergency stop switch is met; operation is convenient and response speed is fast.

Description

Technical Field

[0001] The utility model relates to a hydraulic element, in particular to a manual reversing valve. Background Art

[0002] The reversing valve is a directional control valve with two or more flow forms and two or more oil ports. It is a valve that realizes the communication, cutting and reversing of hydraulic oil flow, as well as pressure unloading and sequential action control. It is a directional control valve that relies on the relative movement of the valve core and the valve body. The ways to operate the valve core movement include manual, motorized, electric, hydraulic, electro-hydraulic and other types.

[0003] In order to ensure safe production, some hydraulic systems will be equipped with an electromagnetic reversing valve as a key component of the emergency stop operation to cut off the supply of hydraulic oil to achieve emergency stop. However, the electromagnetic reversing valve is prone to malfunction due to circuit damage and is not as reliable as a mechanical reversing valve. However, the existing manual reversing valve generally uses a valve stem drive to achieve switching, and the valve core is driven by moving the valve stem to rotate. Its operation method is different from that of the emergency stop button, and its operation is slow and cannot meet the emergency braking requirements. People are usually accustomed to pressing the emergency stop button to perform emergency stop operations. The traditional manual reversing valve is not conducive to people's habitual operation. Utility Model Content

[0004] In order to change the operation mode of the manual reversing valve and provide a manual reversing valve that meets the emergency stop operation habits and can respond quickly, the technical solution adopted by the utility model is:

[0005] A manual reversing valve,

[0006] It includes a valve body and a valve core which is arranged in the valve body and can realize oil circuit switching through axial movement and can reset itself.

[0007] The valve body is provided with a button that can be pressed and a slider that is driven by the button to move;

[0008] A slope surface for driving the valve core to move axially and a plane surface connected with the slope surface for keeping the valve core fixed in the axial direction are arranged on the side of the sliding block in contact with the valve core.

[0009] Furthermore, a roller in contact with the slider is arranged at one end of the valve core.

[0010] Furthermore, a rotating shaft is arranged on the valve body to provide rolling support for the slider.

[0011] The above technical solution is adopted to drive the slider to move by the button, and the slope on the slider drives the top of the valve core to move the valve core axially, while the axial position of the valve core is maintained by the plane, thereby realizing a manual reversing valve. Since the reversing valve is realized by pressing a button, it meets the operating habits of the operator using the emergency stop switch, and the operation is convenient and the response speed is fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of a manual reversing valve;

[0013] Figure 2 It is a partial cross-sectional view of a manual reversing valve;

[0014] Figure 3 Another embodiment structure of a slider;

[0015] Figure 4 This is an example of the application of a manual reversing valve in a specific hydraulic system. DETAILED DESCRIPTION

[0016] The technical solution of the utility model is further described in detail below in conjunction with the accompanying drawings.

[0017] like Figure 1 The manual reversing valve shown in the figure comprises a valve body 1 and a Figure 2 The valve core 2 can be shown in the figure, and one end of the valve core 2 extends out of the valve body 1. The axial movement of the valve core 2 can realize the oil circuit switching, and a spring is arranged in the valve body 1 to enable the valve core 2 to automatically reset when not affected by external force, so as to keep one end of the valve core 2 extending out of the valve body 1. Its internal structure is the same as that of the traditional reversing valve and is not shown here.

[0018] like Figure 1 and Figure 2 As shown, a shell 1-1 is provided. In this embodiment, the shell 1-1 is assembled with the valve body 1. Here, the shell 1-1 is regarded as a part of the valve body 1. That is, the technician may consider designing the valve body 1 as a valve body 1 with a shell 1-1 as shown in the figure for the sake of integrity, or may use the existing reversing valve for the convenience of implementing the present technical solution, and assemble the shell 1-1 outside the valve body 1 of the reversing valve. Therefore, the valve body 1 defined in the technical solution includes the shell 1-1 part. Here, the shell 1-1 part is listed separately only for the convenience of explaining the subsequent assembly relationship.

[0019] like Figure 2As shown, a button 3 is installed on the shell 1-1, and the button 3 includes a button cap 3-1 and a button rod 3-2. The button rod 3-2 passes through the guide hole 1-2 on the shell 1-1, and the operator can drive the button 3 to move axially along the button rod 3-2. A slider 4 is provided at the end of the button rod 3-2. As the button 3 moves, the slider 4 also moves axially along the button rod 3-2. A slope 4-1 and a plane 4-2 connected to the slope 4-1 are provided on the slider 4. When the slider 4 moves, one end of the valve core 2 extending out of the valve body 1 moves on the slope 4-1 and the plane, so that when the valve core 2 moves on the slope 4-1, the slope 4-1 forms an axial force on the valve core 2 to drive the valve core 2 to move axially to realize oil circuit switching. When the valve core 2 is at the plane 4-2, the valve core 2 remains stationary in the axial direction even if the slider moves, and the position state of the valve core remains unchanged. In this embodiment, two planes 4-2 are arranged on the slider 4 and connected by the slope 4-1. The two planes 4-2 are at different heights in the axial direction of the valve core 2. Therefore, when the end of the valve core 2 is at different planes 4-2, the reversing valve is in different oil circuit switching states due to the change in the axial position of the valve core 2. Of course, the slider 4 with only one plane 4-2 can realize oil circuit switching because the extended position of the valve core 2 is kept fixed under the action of the spring and does not need to be positioned by the plane on the slider 4. Therefore, except for this embodiment, Figure 2 In addition to the structure of the slider 4 shown in the embodiment shown, it is also possible to Figure 3 As shown, only one plane 4-2 is provided to realize the positioning of the valve core 2. Regardless of whether the slider 4 has a single plane 4-2 or two planes 4-2, the slope 4-1 is indispensable, and the slope 4-1 in the slider 4 is an important structure capable of driving the valve core 2 to move axially.

[0020] In order to reduce the friction force when the valve core 2 moves on the slider 4, a roller 2-1 is provided at the end of the valve core 2. When the slider 4 moves, the friction between the end of the valve core 2 and the slider 4 is reduced by the rolling of the roller 2-1.

[0021] Furthermore, since the valve core 2 exerts an axial force on the slider 4, although the button rod 3-2 can overcome this force and keep the position of the slider 4 unchanged, the movement resistance of the button rod 3-2 will increase. Therefore, in order to provide better support for the slider 4, the slider 4 can be made to slide against the housing 1-1 on the side opposite to the valve core 2, or as shown in FIG. Figure 2 As shown, a rotating shaft 5 is arranged in the housing 1 - 1 to form a rolling support for the slider 4 to ensure smooth movement of the slider 4 .

[0022] During operation, especially when the reversing valve is used for emergency stop operation, when an emergency occurs, the operator only needs to press the button 3, and the movement of the slider 4 can drive the valve core 2 to switch the oil circuit to handle the emergency. This operation avoids the cumbersomeness and inconvenience of the traditional reversing valve to achieve reversal by pulling the handle, and is more in line with the conventional operation method of the emergency stop switch, and the response speed is faster.

[0023] Here again Figure 4 The manual reversing valve is applied to the hydraulic system of the blowout preventer lifting device to further illustrate its use method. Figure 4 In the hydraulic principle diagram shown, the hydraulic station oil supply is P0, the hydraulic station return oil and the BOP hoisting device operating valve group return oil are connected to T0, the hoisting equipment operating valve group oil supply is P1, the relief valve a oil inlet is connected in parallel with P1, and the relief valve oil drain is also connected to T0. When a special situation occurs on site and the hydraulic system needs to be unloaded or stopped urgently, the staff will instantly press the button, the reversing valve b will be reversed, so that the reversing valve is connected to the return oil T0, and the regulating pressure of the relief valve will instantly become zero. The relief valve connects the oil supply P0 circuit with the return oil T0 circuit, and the oil supply P0 pressure is equal to the return oil T0 pressure, both of which are zero, and the hydraulic system is unloaded. Due to the valve settings and its own characteristics of the BOP hoisting device, the BOP hoisting device brakes and stops urgently. When the danger is lifted and the BOP lifting device needs to be restored to normal operation, the button is pulled up, the slider moves upward, the valve core spring resets and automatically reverses, the remote control port of the relief valve is blocked by the roller reversing valve again, the pressure of the relief valve becomes the original set pressure, the relief valve cuts off the unloading oil circuit again, the control box of the BOP lifting device is operated, and the BOP lifting device resumes normal operation.

Claims

1. A manual reversing valve, The invention comprises a valve body (1) and a valve core (2) which is arranged in the valve body (1) and can realize oil circuit switching by axial movement and can self-reset, and is characterized in that: The valve body (1) is provided with a button (3) that can be pressed, and a slider (4) that is driven by the button (3) to move; A slope surface (4-1) for driving the valve core (2) to move axially and a plane surface (4-2) connected to the slope surface (4-1) for keeping the valve core (2) fixed in the axial direction are provided on the side of the slider (4) in contact with the valve core (2).

2. A manual reversing valve according to claim 1, characterized in that: A roller (2-1) in contact with the slider (4) is arranged at one end of the valve core (2).

3. A manual reversing valve according to claim 1 or 2, characterized in that: The valve body (1) is provided with a rotating shaft (5) which provides rolling support for the slider (4).

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