Electric proportional control two-way valve with position force feedback function

Abstract

The utility model discloses an electric proportional control two-way valve with a position force feedback function, which belongs to the technical field of proportional valves and comprises a valve body. The valve body is provided with a pilot mechanism, a main valve element and a feedback module, the displacement of the main valve element and electromagnetic force of the pilot mechanism are controlled in a direct proportion mode, and the feedback module is arranged between the pilot mechanism and the main valve element and transmits acting force. The valve body is provided with the pilot mechanism, the pilot mechanism moves under the action of electromagnetic force and transmits acting force to the feedback module, meanwhile, movement of the main valve element correspondingly applies acting force to the feedback module, and the electromagnetic force is further adjusted to reach the balance state. The electromagnetic force of the pilot mechanism and the displacement generated in the moving process of the valve element of the main valve are controlled in a direct proportion mode, and position force closed-loop control is achieved.

Description

Technical Field

[0001] This utility model belongs to the field of proportional valve technology, specifically relating to an electro-proportional control two-way valve with position force feedback. Background Technology

[0002] A proportional valve, also known as a proportional flow control valve, is a type of valve that uses electrical signals to proportionally regulate and stabilize the flow rate in an oil circuit, thereby changing the speed of the actuator. It controls the opening and closing of the proportional valve to achieve the on / off state of the oil circuit and the regulation of the flow rate, and is widely used in fluid transportation. Currently, regardless of the required control precision, hydraulic presses all use high-frequency response proportional servo valves. However, high-frequency response proportional servo valves are expensive, creating a need for cost reduction.

[0003] Meanwhile, in the existing technology, two-way control valves are used for on / off control of large flow liquids. Their characteristics are that they are subjected to large forces, and it is not possible to directly drive the valve core of the two-way valve using proportional electromagnets or stepper motors, and it is also impossible to achieve closed-loop control of position force. Therefore, it is necessary to develop an electro-proportional control two-way valve with position force feedback. Utility Model Content

[0004] The purpose of this utility model is to provide an electro-proportional control two-way valve with position force feedback to solve the above-mentioned technical problems. The valve body is provided with a pilot mechanism. The pilot mechanism moves under the action of electromagnetic force and transmits the force to the feedback module. At the same time, the movement of the main valve core applies a force to the feedback module, so that the electromagnetic force is further adjusted to achieve a balanced state. The electromagnetic force of the pilot mechanism and the displacement generated during the movement of the main valve core are directly proportional to each other, realizing closed-loop position force control.

[0005] To achieve the above-mentioned objectives, the technical solution adopted by this utility model is as follows:

[0006] A position force feedback electro-proportional control two-way valve includes a valve body, a pilot mechanism, a main valve core whose displacement is directly proportional to the electromagnetic force of the pilot mechanism, and a feedback module disposed between the pilot mechanism and the main valve core to transmit the force. The pilot mechanism moves under the action of electromagnetic force and transmits the force to the feedback module. Simultaneously, the movement of the main valve core applies a force to the feedback module, further adjusting the electromagnetic force to achieve a balanced state. The electromagnetic force of the pilot mechanism is directly proportional to the displacement generated during the movement of the main valve core, achieving closed-loop position force control.

[0007] Preferably, the pilot mechanism includes an electromagnet and a two-position, three-way pilot proportional valve located below the electromagnet, the pilot proportional valve being connected to the feedback module. The pilot proportional valve is a two-position, three-way control valve. The displacement of the main valve core is directly proportional to the electromagnetic force of the electromagnet; the operation of the control oil circuit is performed correspondingly through the two-position, three-way pilot proportional valve, and the extension of the pilot proportional valve is controlled by adjusting the current of the electromagnet, transmitting the force to the connected feedback module. Due to the pressure difference, the main valve core is displaced accordingly and applies a force to the feedback module, further adjusting the electromagnetic force to achieve a balanced state, thus realizing direct proportional control between the position force of the main valve core and the electromagnetic force, achieving closed-loop position force control.

[0008] Preferably, the pilot proportional valve includes a pilot proportional valve core, a first oil inlet, a return oil outlet, and a first working oil outlet, which are arranged sequentially along the direction of the pilot proportional valve core. Specifically, the first oil inlet, the return oil outlet, and the first working oil outlet are all located within the valve body and their ends abut against the pilot proportional valve core to transmit fluid for operation.

[0009] Preferably, the pilot proportional valve core includes a valve core body, a first working piston corresponding to the first working port, and a second working piston corresponding to the return port. The first and second working pistons adjust the operating states of the first inlet, return port, and first working port respectively. Initially, the first inlet is closed, while the return port and the first working port are connected. When the electromagnet causes the pilot proportional valve core to extend, it gradually transitions to a state where the first inlet and the first working port are connected, while the return port is closed, allowing the pilot proportional valve to form a two-position three-way configuration.

[0010] Preferably, the pilot proportional valve further includes a pilot proportional valve sleeve that mates with the pilot proportional valve core. The first inlet, return, and working ports all penetrate the pilot proportional valve sleeve and abut against the surface of the valve core body. The first inlet, return, first working, second inlet, and second working ports all penetrate the valve body. The pilot proportional valve core is housed within the pilot proportional valve sleeve. An electromagnet applies electromagnetic force to the pilot proportional valve core, causing it to move. This allows the first and second working pistons of the pilot proportional valve core to move accordingly, corresponding to different operating states, achieving a two-position three-way effect. After the pilot proportional valve core moves, it applies a force to the feedback module. The main valve core, due to the pressure difference, moves accordingly and applies a force to the feedback module, further adjusting the electromagnetic force to achieve a balanced state. This ensures that the position force of the main valve core is proportionally controlled to the electromagnetic force, achieving closed-loop position force control.

[0011] Preferably, a force-transmitting spring is arranged around the end of the pilot proportional valve spool furthest from the feedback module, and the other end of the force-transmitting spring abuts against the inner surface of the pilot proportional valve sleeve. Furthermore, the end of the pilot proportional valve spool abuts against one end of the force-transmitting spring. The force-transmitting spring allows the pilot proportional valve spool to return to its original position when not subjected to electromagnetic force, or to rise or fall accordingly when the electromagnetic force decreases or increases, making the pilot proportional valve spool easier to adjust under the combined action of the force-transmitting spring and electromagnetic force.

[0012] Preferably, the inner surface of the pilot proportional valve sleeve is fitted with a spring sleeve, and one end of the force transmission spring abuts against the inner surface of the spring sleeve.

[0013] An adjusting screw is provided through the valve body to abut against the spring sleeve and adjust the zero position of the pilot proportional valve core. The spring sleeve has a first inclined surface, and the end of the adjusting screw has a second inclined surface that abuts against and fits against the first inclined surface. By adjusting the relative position of the adjusting screw with respect to the valve body, the contact area between the second inclined surface and the first inclined surface is adjusted, causing the spring sleeve to move vertically, thereby adjusting the zero position of the pilot proportional valve core.

[0014] Preferably, the feedback module includes a feedback spring with both ends connected to the pilot mechanism and the main valve core, respectively. Specifically, one end of the feedback spring is connected to the pilot proportional valve core, and the other end is connected to the main valve core. Position force closed-loop control is employed, where the force generated by the compression change of the feedback spring acts on the pilot proportional valve core, and is compared in a closed loop with the electromagnetic force of the pilot proportional valve to achieve precise control.

[0015] Preferably, the valve body further includes a main valve sleeve that mates with the outer periphery of the main valve core. A working chamber for accommodating the feedback spring is provided between the main valve sleeve and the pilot mechanism; the working chamber is connected to the second working port. The working chamber is formed by the main valve sleeve, the pilot proportional valve core, the pilot proportional valve sleeve, and the main valve core. This allows the feedback spring within the working chamber to extend and transmit force under the action of the pilot proportional valve core and the main valve core.

[0016] Preferably, a second oil inlet is provided on one side of the main valve sleeve, and the end of the second oil inlet abuts against the side of the main valve core. Hydraulic pressure is applied to the main valve core, satisfying the requirement of a two-way valve to withstand greater forces.

[0017] This application has achieved beneficial technical effects:

[0018] The valve body of this utility model is equipped with a pilot mechanism. The pilot mechanism moves under the action of electromagnetic force and transmits the force to the feedback module. At the same time, the movement of the main valve core applies a force to the feedback module, so that the electromagnetic force is further adjusted to achieve a balanced state. The electromagnetic force of the pilot mechanism and the displacement generated during the movement of the main valve core are directly proportionally controlled to realize closed-loop position force control. Attached Figure Description

[0019] Figure 1 The diagram shown is a structural schematic of this utility model;

[0020] Figure 2 The diagram shown is a top view of the present invention.

[0021] Figure 3 As shown Figure 2 A schematic diagram of the AA-direction cross-section structure;

[0022] Figure 4 As shown Figure 3 A magnified view of a portion of point D;

[0023] Figure 5 The diagram shown illustrates the working principle of this utility model.

[0024] Figure 6 The figure shown is a three-dimensional structural diagram of this utility model.

[0025] Figure Labels

[0026] 1-Valve body; 2-Pilot mechanism; 3-Main valve core; 4-Feedback module; 21-Electromagnet; 22-Pilot proportional valve; 221-Pilot proportional valve core; 222-First oil inlet; 223-Oil return port; 224-First working port; 2211-Valve core body; 2212-First working piston; 2213-Second working piston; 225-Pilot proportional valve sleeve; 226-Force transmission spring; 227-Spring sleeve; 228-Adjusting screw; 41-Feedback spring; 31-Main valve sleeve; 5-Working chamber; 51-Second working port; 311-Second oil inlet. Detailed Implementation

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0028] The technical solution of this utility model will be described in detail below with specific embodiments.

[0029] Reference Figures 1 to 6 As shown, a position force feedback electro-proportional control two-way valve includes a valve body 1, a pilot mechanism 2, a main valve core 3 whose displacement is directly proportional to the electromagnetic force of the pilot mechanism 2, and a feedback module 4 disposed between the pilot mechanism 2 and the main valve core 3 to transmit the force. The pilot mechanism 2 moves under the action of electromagnetic force and transmits the force to the feedback module 4. Simultaneously, the movement of the main valve core 3 applies a force to the feedback module 4, further adjusting the electromagnetic force to achieve a balanced state. The electromagnetic force of the pilot mechanism 2 and the displacement generated during the movement of the main valve core 3 are directly proportional, realizing closed-loop position force control.

[0030] The pilot mechanism 2 includes an electromagnet 21 and a two-position, three-way pilot proportional valve 22 located below the electromagnet 21. The pilot proportional valve 22 is connected to the feedback module 4. The pilot proportional valve 22 is a two-position, three-way control valve. The displacement of the main valve core 3 is directly proportional to the electromagnetic force of the electromagnet 21. The operation of the control oil circuit is performed through the two-position, three-way pilot proportional valve 22. The current of the electromagnet 21 is adjusted to control the extension of the pilot proportional valve 22 and transmit the force to the connected feedback module 4. Due to the pressure difference, the main valve core 3 is displaced accordingly and applies a force to the feedback module 4, further adjusting the electromagnetic force to achieve a balanced state. This achieves direct proportional control between the position force of the main valve core 3 and the electromagnetic force, realizing closed-loop position force control.

[0031] The pilot proportional valve 22 includes a pilot proportional valve core 221, a first oil inlet 222, an oil return port 223, and a first working oil port 224. The first oil inlet 222, the oil return port 223, and the first working oil port 224 are arranged sequentially along the setting direction of the pilot proportional valve core 221. Specifically, the first oil inlet 222, the oil return port 223, and the first working oil port 224 are all located inside the valve body 1 and their ends abut against the pilot proportional valve core 221 to transmit fluid for operation.

[0032] The pilot proportional valve core 221 includes a core body 2211, a first working piston 2212 corresponding to the first working port 224, and a second working piston 2213 corresponding to the return port 223. The first working piston 2212 and the second working piston 2213 adjust the operating states of the first inlet port 222, the return port 223, and the first working port 224. Initially, the first inlet port 222 is closed, while the return port 223 is connected to the first working port 224. When the electromagnet 21 causes the pilot proportional valve core 221 to extend, it gradually transitions to a state where the first inlet port 222 is connected to the first working port 224, while the return port 223 is closed, allowing the pilot proportional valve 22 to form a two-position three-way configuration.

[0033] The pilot proportional valve 22 also includes a pilot proportional valve sleeve 225 that mates with the pilot proportional valve core 221. The first oil inlet 222, the oil return port 223, and the first working oil port 224 all penetrate the pilot proportional valve sleeve 225 and abut against the surface of the valve core body 2211. The first oil inlet 222, the oil return port 223, the first working oil port 224, the second oil inlet, and the second working oil port all penetrate the valve body 1. The pilot proportional valve core 221 is installed inside the pilot proportional valve sleeve 225. The electromagnet 21 applies electromagnetic force to the pilot proportional valve core 221, causing the pilot proportional valve core 221 to move. This causes the first working piston 2212 and the second working piston 2213 of the pilot proportional valve core 221 to move accordingly, forming different working states and achieving a two-position three-way effect. After the pilot proportional valve core 221 moves, it applies a force to the feedback module 4. The main valve core 3, due to the pressure difference, moves accordingly and applies a force to the feedback module 4, further adjusting the electromagnetic force to achieve a balanced state. This achieves a direct proportional control between the position force of the main valve core 3 and the electromagnetic force, realizing closed-loop position force control.

[0034] A force transmission spring 226 is arranged around the end of the pilot proportional valve core 221 furthest from the feedback module 4, and the other end of the force transmission spring 226 abuts against the inner surface of the pilot proportional valve sleeve 225. The end of the pilot proportional valve core 221 also abuts against one end of the force transmission spring 226. The force transmission spring 226 allows the pilot proportional valve core 221 to return to its original position when not subjected to electromagnetic force, or to rise or fall accordingly when the electromagnetic force decreases or increases, making the pilot proportional valve core 221 easier to adjust under the combined action of the force transmission spring and electromagnetic force.

[0035] The inner surface of the pilot proportional valve sleeve 225 is connected to the spring sleeve 227, and one end of the force transmission spring 226 abuts against the inner surface of the spring sleeve 227.

[0036] The valve body 1 is perforated by an adjusting screw 228 that abuts against the spring sleeve 227 to adjust the zero position of the pilot proportional valve core 221. The spring sleeve 227 has a first inclined surface 2271, and the end of the adjusting screw 228 has a second inclined surface 2281 that abuts against and fits against the first inclined surface 2271. By adjusting the relative position of the adjusting screw 228 with respect to the valve body, the contact area between the second inclined surface 2281 and the first inclined surface 2271 is adjusted, causing the spring sleeve 227 to move vertically, thereby adjusting the zero position of the pilot proportional valve core 221.

[0037] The feedback module 4 includes a feedback spring 41 whose two ends are connected to the pilot mechanism 2 and the main valve core 3, respectively. Specifically, one end of the feedback spring 41 is connected to the pilot proportional valve core 221, and the other end is connected to the main valve core 3. This technical solution adopts position force closed-loop control. The force generated by the compression change of the feedback spring 41 acts on the pilot proportional valve core 221, and is compared with the electromagnetic force of the pilot proportional valve 22 in a closed loop to achieve precise control.

[0038] The valve body 1 also includes a main valve sleeve 31 that mates with the outer periphery of the main valve core 3. A working chamber 5, housing a feedback spring 41, is provided between the main valve sleeve 31 and the pilot mechanism 2. The working chamber 5 connects to the second working port 51. The working chamber 5 is formed by the main valve sleeve 31, the pilot proportional valve core 221, the pilot proportional valve sleeve 225, and the main valve core 3. This allows the feedback spring 41 to extend and retract within the working chamber 5 under the combined forces of the pilot proportional valve core 221 and the main valve core 3, thus transmitting force.

[0039] A second oil inlet 311 is provided on one side of the main valve sleeve 31, and the end of the second oil inlet 311 abuts against the side of the main valve core 3. Hydraulic pressure is applied to the main valve core to meet the requirement of a two-way valve having a large force.

[0040] The first oil inlet 222 is connected to the second oil inlet 311; the first working oil port 224 is connected to the second working oil port 51.

[0041] The feedback spring 41 has a first connecting member 411 at both ends, which is connected to the pilot mechanism 2, and a second connecting member 412, which is connected to the main valve core 3. The first connecting member 411 is connected to the end of the pilot proportional valve core 221 away from the electromagnet 21.

[0042] The pilot proportional valve core 221 applies force to the feedback spring 41 under the action of electromagnetic force, and the main valve core 3 applies force to the feedback spring 41 in turn. The spring position force closed loop is adopted. The opening displacement of the main valve core 3 at the valve port is proportionally controlled to the electromagnetic force generated by the input current, thereby realizing the function of the electro-proportional throttle valve.

[0043] The connection or disconnection is controlled by the main valve core 3 and is set on the inlet and outlet of the main valve sleeve; by moving the main valve core 3, the connection or disconnection of the inlet and outlet of the two-way valve is controlled, thereby achieving the effect of connection or closure.

[0044] This innovative technical solution employs a pilot valve, using hydraulic pressure to act on the main valve core, thus meeting the high-force requirements of a two-way valve. Furthermore, this invention utilizes positional force closed-loop control, generating force through spring compression variations that acts on the pilot valve core. This force is compared in a closed loop with the electromagnet force of the pilot valve, achieving precise control. The inclusion of an adjusting screw also fully considers the machining errors of the corresponding parts. Simultaneously, this positional force closed-loop control is applied to high-flow-rate two-way control valves in the hydraulic industry.

[0045] This solution proposes a design with performance slightly lower than that of a high-frequency response proportional valve, but with a significant price advantage. Existing technologies use a position sensor and a high-performance pilot valve to control a two-way valve; however, both components in this solution are relatively expensive. This solution uses a spring mechanism instead of a position sensor, offering a price advantage. Furthermore, this solution employs a spring-force closed-loop control, enabling direct proportional control of the valve opening displacement of the two-way cartridge valve to the input current (electromagnetic force), thus achieving the function of an electro-proportional throttle valve.

[0046] It meets the design requirements of low-cost hydraulic presses that do not have high performance requirements but still need to be electrically remotely stepless adjustable.

[0047] The work process is as follows:

[0048] Assuming the main valve is in a stable state under the input current value B, when a larger input current C is applied, the valve core of the pilot proportional valve extends under the action of the electromagnet force. This increases the connection between ports A and T of the pilot valve, reducing the pressure in the upper chamber of the main valve. The main valve core moves upward, increasing the valve opening proportional to the current (electromagnetic force). Simultaneously, the feedback spring's compression increases under the action of the main valve core, resulting in a greater force acting on the pilot proportional valve core, balancing the electromagnet force. The main valve core also achieves a new equilibrium. Furthermore, when the input current decreases, the main valve core moves downward, reducing the valve opening. Ports P, A, and T represent the inlet, working port, and return port, respectively.

[0049] This technical solution applies positional force closed-loop control to the high-flow two-way control in the hydraulic industry; it uses a pilot valve and hydraulic pressure to act on the main valve core, which meets the characteristics of the two-way valve being subject to large forces; it uses a low-power pilot stage to control the final target of a high-power two-way valve, and it also employs positional force closed-loop control.

[0050] This technical solution is for large-size, high-power two-way cartridge valves used in the hydraulic industry.

[0051] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

[0053] The embodiments of the position force feedback electro-proportional control two-way valve provided by this utility model have been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A position force feedback electro-proportional control two-way valve, comprising a valve body (1), characterized in that, The valve body is provided with: Pilot mechanism (2); The displacement of the main valve core (3) is proportional to the electromagnetic force of the pilot mechanism (2); The feedback module (4) is located between the pilot mechanism (2) and the main valve core (3) and transmits the force. The pilot mechanism (2) includes an electromagnet (21) and a pilot proportional valve (22) located below the electromagnet (21) and being a two-position three-way valve. The pilot proportional valve (22) is connected to the feedback module (4). The pilot proportional valve (22) includes a pilot proportional valve core (221), a first oil inlet (222), an oil return port (223), and a first working oil port (224). The first oil inlet (222), the oil return port (223), and the first working oil port (224) are arranged sequentially along the setting direction of the pilot proportional valve core (221).

2. The position force feedback electro-proportional control two-way valve according to claim 1, characterized in that, The pilot proportional valve core (221) includes a core body (2211), a first working piston (2212) corresponding to the first working port (224), and a second working piston (2213) corresponding to the return port (223).

3. The position force feedback electro-proportional control two-way valve according to claim 1, characterized in that, The pilot proportional valve (22) also includes a pilot proportional valve sleeve (225) that is connected to the pilot proportional valve core (221).

4. The position force feedback electro-proportional control two-way valve according to claim 3, characterized in that, A force transmission spring (226) is arranged around the end of the pilot proportional valve core (221) away from the feedback module (4), and the other end of the force transmission spring (226) abuts against the inner surface of the pilot proportional valve sleeve (225).

5. The position force feedback electro-proportional control two-way valve according to claim 4, characterized in that, The inner surface of the pilot proportional valve sleeve (225) is connected to the spring sleeve (227), and one end of the force transmission spring (226) abuts against the inner surface of the spring sleeve (227). The valve body (1) is provided with an adjusting screw (228) that abuts against the spring sleeve (227) to adjust the zero position of the pilot proportional valve core (221).

6. The position force feedback electro-proportional control two-way valve according to any one of claims 1-5, characterized in that, The feedback module (4) includes a feedback spring (41) whose two ends are respectively connected to the pilot mechanism (2) and the main valve core (3).

7. The position force feedback electro-proportional control two-way valve according to claim 6, characterized in that, The valve body (1) is also provided with a main valve sleeve (31) that is configured to cooperate with the outer periphery of the main valve core (3). A working cavity (5) for accommodating the feedback spring (41) is provided between the main valve sleeve (31) and the pilot mechanism (2). The working cavity (5) is connected to the second working oil port (51).

8. The position force feedback electro-proportional control two-way valve according to claim 7, characterized in that, The main valve sleeve (31) is provided with a second oil inlet (311) on one side, and the end of the second oil inlet (311) abuts against the side of the main valve core (3).

Images