A pilot handle valve with switchable oil paths

Abstract

The utility model discloses a kind of pilot handle valves with switchable oil circuit, including driving handle, upper valve body and lower valve body, rotary oil circuit switching piece is equipped between the lower valve body and upper valve body, lower valve body is connected with upper valve body by rotary oil circuit switching piece;The rotary oil circuit switching piece includes core shaft and rotary body with rotary sleeve of core shaft, rotary body is connected with lower valve body, upper end oil port corresponding with channel arranged in upper valve body is equipped on the core shaft upper end face, lower end oil port corresponding with channel arranged in lower valve body is equipped on the lower end face, four oil tanks for making upper end oil port and lower end oil port two two intercommunication are equipped on the rotary body.The utility model is equipped with the rotary oil circuit switching piece of core shaft and rotary body, realizes that product can be disassembled, improves maintainability, reduces use cost, integrates oil circuit switching function, reduces the number of whole machine system components.

Description

Technical Field

[0001] This utility model relates to a pilot handle valve, and more particularly to a pilot handle valve with switchable oil circuit. Background Technology

[0002] As a core component of the human-machine interface in hydraulic control systems, the pilot handle is widely used in the construction machinery industry. In industry applications, the actuators controlled by the handle often need to be changed according to the operator's different operating habits. Typically, the pilot handle has a four-way cross structure; the forward and backward movement controls one actuator, such as the excavator's boom, while the left and right movement controls another actuator, such as the excavator's slewing motion. Switching the hydraulic circuit controlled by the pilot handle allows the mechanisms controlled in the two directions to be interchanged.

[0003] To achieve interchangeability, an independent directional valve is connected in series within the system, integrating the oil circuit switching function onto the handle valve. When the handle oil circuit is switched, the oil pipe must twist accordingly. On one hand, due to the reaction force in the oil pipe, the operating force becomes excessive. On the other hand, the twisting of the oil pipe can easily lead to loosening of the pipe structure and oil leakage. Furthermore, the twisting of the oil pipe can cause deformation, increasing the resistance to internal oil flow and reducing system performance. Moreover, the connection between the directional valve's rotation switching structure and the main body is achieved through an internal wire retaining ring, which cannot be disassembled once assembled, resulting in poor maintainability. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a pilot handle valve that is reasonably designed, simple in structure, detachable, and has switchable oil circuit, in order to overcome the shortcomings of the existing technology.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A pilot handle valve with switchable oil circuit includes a drive handle, an upper valve body, and a lower valve body. Its key feature is a rotary oil circuit switching element between the lower and upper valve bodies, with the lower valve body connected to the upper valve body via this element. The rotary oil circuit switching element includes a spindle connected to the upper valve body and a rotating body rotatably sleeved with the spindle. The rotating body is connected to the lower valve body. The upper end face of the spindle has an upper oil port corresponding to a channel within the upper valve body, and the lower end face of the spindle has a lower oil port corresponding to a channel within the lower valve body. The rotating body has four oil grooves that connect the upper and lower oil ports in pairs, making the product a detachable structure for easy replacement of parts.

[0007] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the upper valve body includes a housing, a main valve core, and a return spring and a pressure regulating spring sleeved on the main valve core. The pressure regulating spring is sleeved on the upper part of the main valve core, and the return spring is sleeved on the lower part of the main valve core. There are four vertical oil passages and two horizontal oil passages in the housing. The four vertical oil passages are arranged in pairs, and each pair of vertical oil passages is connected by a horizontal oil passage. There is a return oil chamber and an oil supply chamber on one side of the housing. The main valve core is located at the junction of each pair of vertical oil passages and horizontal oil passages. The lower half of the main valve core is provided with a longitudinal oil passage hole. The middle part of the main valve core is provided with a horizontal control oil hole that communicates with the upper end of the longitudinal oil passage hole. The top of the main valve core is connected to a fixed seat in the housing through a buffer mechanism.

[0008] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the buffer mechanism includes a push rod with a hollow cavity and a secondary valve core disposed in the hollow cavity of the push rod. The secondary valve core is connected to the main valve core. The push rod is fixed on a fixed base. A secondary spring for adjusting the buffer damping size is disposed in the hollow cavity.

[0009] The technical problem to be solved by this utility model can also be achieved by the following technical solution: a sealing element for preventing oil leakage is provided on the side wall of the mandrel, the upper end face of the outer periphery of the upper oil port, and the lower end face of the outer periphery of the lower oil port.

[0010] The technical problem to be solved by this utility model can also be achieved by the following technical solution: two sets of bolt holes are provided on the outer wall of the rotating body. The two sets of threaded holes are not on the same plane, which makes them easy to identify. One set is used to cooperate with the locking plate to achieve positioning, and the remaining set is used to install the rotating handle.

[0011] The technical problem to be solved by this utility model can also be achieved through the following technical solution: a locking plate is provided between the upper valve body and the rotating body to prevent the rotating body from rotating during use. The upper valve body and the rotating body are fixedly connected by the locking plate, and the locking plate is used for positioning to ensure accurate oil circuit switching.

[0012] The technical problem to be solved by this utility model can also be achieved through the following technical solution: an oil return groove is provided on the mandrel around the sealing element for collecting the oil leaking from the gap seal and transporting it to the oil return interface of the product.

[0013] Compared with the prior art, this utility model, by setting a rotary oil circuit switching component with a spindle and a rotating body, on the one hand, realizes product disassembly, improves maintainability, and reduces usage costs; on the other hand, it integrates oil circuit switching function, reducing the number of components in the whole system. By setting corresponding oil ports and oil grooves, the oil passages in the upper valve body and the lower valve body are connected. By setting a buffer mechanism, the product performance curve is changed to two-level control, improving the product's operability. Attached Figure Description

[0014] Figure 1 This is a structural diagram of the pilot handle valve with switchable oil circuit described in this utility model;

[0015] Figure 2 Schematic diagram of the positioning structure for a rotating body;

[0016] Figure 3 This is a schematic diagram of the screw connection and fixing structure at the bottom of the lower valve body;

[0017] Figure 4 Top view of the mandrel;

[0018] Figure 5 This is the bottom view of the mandrel;

[0019] Figure 6 This is a schematic diagram of the structure of a solid of revolution;

[0020] Figure 7 This is a top view of the upper valve body;

[0021] Figure 8 This is a bottom view of the upper valve body.

[0022] In the diagram: 1-Upper valve body, 2-Spindle, 3-Rotating body, 4-Lower valve body, 5-Secondary valve core, 6-Secondary spring, 7-Seal, 8-Swing seat, 9-Connector, 10-Seal, 11-Reset spring, 12-Push rod sleeve, 13-Main valve core, 14-Pressure regulating spring, 15-Fixed seat, 16-Universal joint, 17-Locking plate, 18-Bolt, 19-Oil groove. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] Reference Figure 1-8 A pilot-operated handle valve with switchable oil circuit includes a drive handle, an upper valve body, and a lower valve body. The lower valve body has the same structure as a shuttle valve.

[0026] The drive handle consists of a universal joint 16, a rocker seat 8, and a connector 9. The connector has various connection forms, such as threads and bayonet joints (this invention shows the threaded form). The connector is installed and connected to the multi-functional handle. Driven by the handle, the rocker seat 17 can swing around the universal joint in any direction, pressing down the push rod 10.

[0027] The upper valve body is mainly composed of valve body 1, main valve core 13, pressure regulating spring 14, reset spring 11, fixed seat 15, push rod 10, push rod sleeve 12, secondary valve core 5, and secondary spring 6.

[0028] The lower half of the main valve core 13 is hollow, serving as a longitudinal oil passage. A transverse control oil passage is opened in the middle, with the return oil chamber T and the supply oil chamber P on its upper and lower sides, respectively. The main valve core is controlled by the force of the pressure regulating spring. When the main valve core moves down to connect with the supply oil chamber P, the oil in chamber P flows from the middle oil passage to the bottom of the main valve core, creating a hydraulic reaction force at the bottom. As the bottom reaction force continues to increase, it pushes the main valve core upward, causing the previously open chamber P to tend to close, reducing the opening and lowering the pressure. When the bottom reaction force balances the spring force, the main valve core reaches an equilibrium state, achieving stable secondary pressure output.

[0029] Simultaneously, when the pressure regulating spring is compressed to a certain height, the main valve core 13 contacts the secondary valve core 5, and the secondary spring 6 takes effect. At this time, the pressure regulating spring and the secondary spring work simultaneously, changing the secondary pressure curve and realizing two-stage control of the performance curve.

[0030] The buffer mechanism consists of a push rod 10 installed in the groove of the fixed seat 15, with the two fitting tightly together to form a unified whole during operation. The fixed seat 15, push rod 10, secondary valve core 5, and pressure regulating spring 6 form a piston structure within the valve hole, creating a closed cavity with the push rod sleeve. When the fixed seat moves up and down, the volume of the closed cavity changes, and the hydraulic oil inside overflows / is drawn in through the gap between the fixed seat and the valve hole. The damping effect is adjusted by changing the size of the gap. Alternatively, the buffer damping can be adjusted by creating an oil groove on the outer circumference of the fixed seat, such as a flat notch or an arc groove.

[0031] The rotary oil circuit switching component consists of a spindle 2, a rotating body 3, and an O-ring 7. The spindle 2 has two sets of holes, one set at each of the upper and lower ends, with four channels in each set. The two sets of holes are not connected; one set connects to the upper valve body 1, and the other set connects to the lower valve body 4. The four channels of the two sets of holes are circumferentially distributed around the center of the spindle.

[0032] Four oil grooves 19 are provided on the inner circular surface of the rotating body 3, allowing the rotating body 3 to rotate on the mandrel. After installation and fixation, the four oil grooves 19 on the rotating body can connect the eight oil ports on the mandrel in pairs, thus enabling communication between the upper and lower ends of the mandrel. When the rotating body rotates by a set angle, the order of the two holes connected by the oil grooves changes. For example, refer to... Figure 4-6 The mandrel has oil ports A1 / A2 / A3 / A4 at one end and oil ports B1 / B2 / B3 / B4 at the other end. These two sets of holes are connected by oil grooves 19 on the rotating body. By changing the rotating body, the connection sequence changes from (A1-B1)(A2-B2)(A3-B3)(A4-B4) to (A1-B2)(A2-B3)(A3-B4)(A4-B1).

[0033] To prevent oil leakage, four seals, namely O-rings, are installed on each mating surface. (Mandrel) <2> Four annular sealing strips are installed at each end to achieve a sealing function while reducing the hydraulic separation force at the end face. An oil return groove is installed around the sealing strips to collect oil leaking from the gap seal and transport it to the product's oil return interface.

[0034] In addition, the upper valve body 1, spindle 2, and lower valve body 4 are connected and locked by screws. A combined sealing gasket is installed on the mating surface between the screw head and the lower valve body to prevent internal oil leakage. The upper valve body 1 and the rotating body 3 are fixed by a locking plate 17 to prevent the rotating body from rotating during use. The locking plate is fixed to the valve body by bolts 18. The rotating body surface has threaded holes at different angles, and these threaded holes correspond spatially to the internal oil passage groove, allowing for accurate positioning of the oil passage groove. Two sets of bolt holes are provided on the outer circumference of the rotating body; one set engages with the locking plate for positioning, and the remaining set is used to install the rotating handle. The two sets of threaded holes are not on the same plane for easy identification.

[0035] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A pilot handle valve with switchable oil circuit, comprising a drive handle, an upper valve body, and a lower valve body, characterized in that, A rotary oil circuit switching component is provided between the lower valve body and the upper valve body. The lower valve body is connected to the upper valve body through the rotary oil circuit switching component. The rotary oil circuit switching component includes a spindle connected to the upper valve body and a rotating body rotatably sleeved with the spindle. The rotating body is connected to the lower valve body. The upper end face of the spindle is provided with an upper oil port corresponding to the channel provided in the upper valve body. The lower end face of the spindle is provided with a lower oil port corresponding to the channel provided in the lower valve body. The rotating body is provided with four oil grooves that connect the upper oil port and the lower oil port in pairs.

2. The pilot handle valve with switchable oil circuit according to claim 1, characterized in that, The upper valve body includes a housing, a main valve core, and a return spring and a pressure regulating spring sleeved on the main valve core. The pressure regulating spring is sleeved on the upper part of the main valve core, and the return spring is sleeved on the lower part of the main valve core. There are four vertical oil passages and two horizontal oil passages in the housing. The four vertical oil passages are arranged in pairs, and each pair of vertical oil passages is connected by a horizontal oil passage. There are a return oil chamber and an oil supply chamber on one side of the housing. The main valve core is located at the junction of each pair of vertical oil passages and horizontal oil passages. The lower half of the main valve core is provided with a longitudinal oil passage hole, and the middle part of the main valve core is provided with a horizontal control oil hole that communicates with the upper end of the longitudinal oil passage hole. The top of the main valve core is connected to a fixed seat in the housing through a buffer mechanism.

3. The pilot handle valve with switchable oil circuit according to claim 2, characterized in that, The buffer mechanism includes a push rod with a hollow cavity and a secondary valve core disposed in the hollow cavity of the push rod. The secondary valve core is connected to the main valve core. The push rod is fixed on a fixed base. A secondary spring for adjusting the buffer damping is disposed in the hollow cavity.

4. The pilot handle valve with switchable oil circuit according to claim 1, characterized in that, A locking plate is provided between the upper valve body and the rotating body to prevent the rotating body from rotating during use, and the upper valve body and the rotating body are fixedly connected by the locking plate.

5. A pilot handle valve with switchable oil circuit according to claim 4, characterized in that, Two sets of bolt holes are provided on the outer wall of the rotating body. The two sets of threaded holes are not on the same plane. One set is used to cooperate with the locking plate for positioning, and the remaining set is used to install the rotating handle.

6. A pilot handle valve with switchable oil circuit according to claim 1, characterized in that, The mandrel is provided with seals on its side wall, the upper end face of the upper oil port, and the lower end face of the lower oil port to prevent oil leakage.

7. A pilot handle valve with switchable oil circuit according to claim 6, characterized in that, An oil return groove is provided on the mandrel surrounding the seal to collect the oil leaking from the gap seal.

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