Overflow valve, overflow valve group and hydraulic equipment

Abstract

The utility model provides an overflow valve, an overflow valve set and hydraulic equipment. The overflow valve comprises a main valve body, a cone valve element, an adjusting rod, a pressure detection component and a force application component. The main valve body is provided with a first containing space and a second containing space which are communicated, the cone valve element is located in the first containing space, and the adjusting rod is located in the second containing space. The adjusting rod is provided with a hydraulic oil channel, a port of the hydraulic oil channel communicates with the first containing space, and the cone portion of the cone valve element extends into the hydraulic oil channel through the port to seal the port. The pressure detection part detects the pressure borne by the cone valve element, and the force application part applies force to the cone valve element based on the pressure; the main valve body is further provided with a liquid inlet and a liquid return opening, the liquid inlet is communicated with the hydraulic oil channel, and the liquid return opening is communicated with the first containing space. Hydraulic oil flows into the hydraulic oil channel through the liquid inlet to push the cone valve element to be separated from the port so as to flow into the first containing space and flow out of the liquid return opening. By means of the overflow valve, a good pressure control effect can be achieved on hydraulic equipment.

Description

Technical Field

[0001] This application relates to the technical field of hydraulic control, and particularly to a relief valve, a relief valve group, and a hydraulic device. Background Art

[0002] With the development of hydraulic control technology, hydraulic devices are used more and more widely, and the requirements for the use safety of hydraulic devices are also getting higher and higher.

[0003] In a hydraulic device, the pressure provided by the flow of hydraulic oil is used to drive the movement of the actuator. A relief valve needs to be provided in the hydraulic device so that when the hydraulic oil pressure in the hydraulic device is too high, the hydraulic oil flows out of the relief valve to reduce the pressure of the hydraulic device and ensure that the hydraulic device operates within a safe pressure range.

[0004] However, at present, the pressure control effect of using a relief valve for a hydraulic device still needs to be improved. Utility Model Content

[0005] This application provides a relief valve, a relief valve group, and a hydraulic device. Using this relief valve can achieve a better pressure control effect on the hydraulic device.

[0006] According to one aspect of the embodiments of the present application, a relief valve is provided, including: a main valve body, a conical valve core, an adjusting rod, a pressure detection component, and a force application component;

[0007] The main valve body has a first accommodating space and a second accommodating space that are communicated. The conical valve core is located in the first accommodating space, and the adjusting rod is located in the second accommodating space;

[0008] The adjusting rod has a hydraulic oil passage, and the port of the hydraulic oil passage communicates with the first accommodating space. The conical part of the conical valve core extends into the hydraulic oil passage through the port to seal the port;

[0009] The pressure detection component detects the pressure received by the conical valve core, and the force application component applies a force to the conical valve core based on the pressure;

[0010] The main valve body also has a liquid inlet and a liquid return port. The liquid inlet communicates with the hydraulic oil passage, and the liquid return port communicates with the first accommodating space; hydraulic oil flows into the hydraulic oil passage through the liquid inlet, pushes the conical valve core to separate from the port and flows into the first accommodating space, and flows out from the liquid return port.

[0011] According to another aspect of the embodiments of the present application, a relief valve group is provided, including: a target relief valve, and a pilot valve or a remote control valve connected to the target relief valve;

[0012] The pilot valve or the remote control valve controls the opening and closing of the target relief valve, and the pilot valve or the remote control valve includes the above-mentioned relief valve.

[0013] According to another aspect of the embodiments of the present application, a hydraulic device is provided. The hydraulic device includes: a power component, a control component, and an execution component. The power component provides hydraulic power for the control component, and the control component controls the movement of the execution component based on the hydraulic power.

[0014] The control component includes a pressure control valve, a flow control valve, and a direction control valve. The pressure control valve includes the above-mentioned relief valve or the above-mentioned relief valve group.

[0015] In the embodiments of the present application, the relief valve includes a pressure detection component. The pressure received by the conical valve core is detected through this pressure detection component, and the force application component applies a force to the conical valve core based on this pressure. In this way, a closed-loop control of the conical valve core can be carried out, and an accurate pressure can be applied to the conical valve core to ensure that the conical valve core seals the hydraulic oil passage of the adjusting rod according to the accurate pressure, so that when the pressure of the hydraulic oil reaches the specified value, the pressure is released through the relief valve. The relief valve can be used to accurately control the pressure of the hydraulic device. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of a relief valve provided by the embodiments of the present application;

[0017] Figure 2 is a schematic structural diagram of a conical valve core provided by the embodiments of the present application;

[0018] Figure 3 is a schematic cross-sectional diagram of a main valve body provided by the embodiments of the present application;

[0019] Figure 4 is a schematic structural diagram of another relief valve provided by the embodiments of the present application;

[0020] Figure 5 is a schematic circuit diagram of a relief valve provided by the embodiments of the present application;

[0021] Figure 6 is a schematic connection diagram of a relief valve and an external electronic controller provided by the embodiments of the present application;

[0022] Figure 7 is a schematic connection diagram of another relief valve and an external electronic controller provided by the embodiments of the present application;

[0023] Figure 8 is a schematic diagram of a six-way diameter surface provided by the embodiments of the present application;

[0024] Figure 9It is a structural block diagram of a hydraulic device provided by an embodiment of the present application. Detailed implementation manners

[0025] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the connotation of the present application. Therefore, the present application is not limited by the specific implementations disclosed below.

[0026] The terms used in one or more embodiments of the present application are for the purpose of describing specific embodiments only and are not intended to limit one or more embodiments of the present application. The singular forms "a", "the", and "said" used in one or more embodiments of the present application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used in one or more embodiments of the present application refers to and includes any or all possible combinations of one or more of the associated listed items. The term "at least one" in one or more embodiments of the present application refers to "one or more", and "a plurality" refers to "two or more". The term "comprising" is an open-ended description and should be understood as "including but not limited to", and other contents may also be included on the basis of the described contents.

[0027] It should be understood that although the terms "first", "second", etc. may be used in one or more embodiments of the present application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of one or more embodiments of the present application, "first" may also be referred to as "second", and similarly, "second" may also be referred to as "first". Depending on the context, the word "if" as used herein can be interpreted as "when" or "while" or "in response to determining".

[0028] In the field of industrial automation, various devices need to be automatically controlled. For example, in scenarios such as metallurgy, power generation, petrochemical, intelligent manufacturing, machine tools, intelligent devices, energy transportation, engineering equipment, testing machines, etc., some components need to be automatically controlled, and the requirements for the speed and accuracy of automatic control are also relatively high. Currently, hydraulic devices can be used to achieve automatic control of components, and it is necessary to ensure that the pressure of the hydraulic device is within a safe range. The use of a relief valve is essential. The relief valve can release pressure when the system pressure is too high to ensure the pressure stability of the system. The relief valve is also a core component of various high-precision hydraulic devices, robots, numerically controlled machine tools, and machining centers.

[0029] The overflow valve has an inlet port and a return port. The inlet port is connected to the transmission channel of the hydraulic oil in the hydraulic equipment, and the overflow valve uses a conical valve core to block between the inlet port and the return port at a set pressure. When the pressure of the hydraulic oil in the transmission channel is greater than the set pressure, it pushes the conical valve core to move and flow towards the return port, realizing the pressure release in the transmission channel. However, the response speed of the overflow valve is usually slow, and the control accuracy of the pressure is also low. The error between the actual opening pressure and the required pressure of the overflow valve is large, resulting in a poor pressure control effect on the hydraulic equipment. In addition, the overflow valve also has a large hysteresis loop, which will increase the steady-state error of the system, reduce the control accuracy of the overflow valve, and make the system unstable.

[0030] The embodiment of the present application provides an overflow valve with high control accuracy, fast response speed, and small hysteresis loop. Using this overflow valve can improve the pressure control effect on the hydraulic equipment. The present application also provides an overflow valve group and a hydraulic equipment, which will be introduced one by one in the following embodiments.

[0031] Figure 1 It is a schematic structural diagram of an overflow valve provided by the embodiment of the present application. As Figure 1 shown, the overflow valve 10 includes: a main valve body 101, a conical valve core 102, an adjusting rod 103, a pressure detection component 104, and a force application component 105. The overflow valve 10 belongs to a proportional overflow valve.

[0032] The main valve body 101 has a hollow area that can accommodate other components. For example, the hollow area of the main valve body 101 includes a connected first accommodation space K1 and a second accommodation space K2. Figure 1 Taking the first accommodation space K1 and the second accommodation space K2 arranged along the reference direction and passing through both ends of the main valve body 101, and the second accommodation space K2 being strip-shaped as an example, the reference direction can be the left-right direction in the figure. Figure 1 Also taking the cross-sectional area of the first accommodation space K1 being larger than the cross-sectional area of the second accommodation space K2 as an example, the cross-section is perpendicular to the reference direction. In some embodiments, the cross-sectional area of the first accommodation space K1 can also be smaller than the cross-sectional area of the second accommodation space K2.

[0033] The conical valve core 102 is located in the first accommodation space K1, and the adjusting rod 103 is located in the second accommodation space K2. The adjusting rod 103 has a hollow area extending along its axial direction, and the axial direction of the adjusting rod 103 is parallel to the reference direction. This hollow area is a hydraulic oil channel for transmitting hydraulic oil. One end of the hydraulic oil channel facing the first accommodation space K1 is open, and this opening is also the port of the hydraulic oil channel. Therefore, the port of the hydraulic oil channel is connected to the first accommodation space K1.

[0034] Figure 2 It is a schematic structural diagram of a conical valve core provided by the embodiment of the present application. AsFigure 2 As shown, the conical valve core 102 has a conical portion 1021 and a base 1022, and the base 1022 can be used to carry the conical portion 1021. The conical portion 1021 of the conical valve core 102 extends the front end portion into the hydraulic oil passage through the port of the hydraulic oil passage, and seals the port by using the conical surface of the conical portion 1021. The conical valve core 102 can seal the port under the action of the force-applying member 105. The force-applying member 105 can be located on the side of the conical valve core 102 away from the adjusting rod 103, and the force-applying member 105 applies a force to the conical valve core 102, so that the conical valve core 102 seals the port of the hydraulic oil passage with a certain pressure. In the embodiment of the present application, the case where the conical valve core 102 seals the port of the hydraulic oil passage with a target pressure is taken as an example for description.

[0035] The main valve body 101 also has a liquid inlet port (P port) and a liquid return port (T port). Figure 1 Taking the case where both the liquid inlet port and the liquid return port are located on the bottom surface of the main valve body 101 as an example for illustration. Figure 3 It is a schematic cross-sectional view of a main valve body provided by an embodiment of the present application. Figure 3 What is shown can be Figure 1 a schematic view of the cross-section a-a' of the main valve body 101 in Figure 1 Please refer to Figure 3 Combined with

[0036] Please continue to refer to Figure 3 In, the P port and the T port are opened in the middle area of the target surface of the main valve body 101, and the target surface can be the bottom surface of the main valve body 101. The P port is connected to the hydraulic oil passage through a straight passage in the main valve body 101, and the T port is connected to the first accommodating space K1 through an L-shaped passage in the main valve body 101. The connection passage between the P port and the hydraulic oil passage can be called the control oil circuit, and the connection passage between the T port and the first accommodating space K1 can be called the oil return circuit.

[0037] The P port can be connected to other components in the hydraulic device that are controlled using hydraulic oil, and the T port can be connected to the fuel tank. The overflow valve 10 can be used to control the pressure in the hydraulic device. The target pressure based on which the tapered valve core 102 seals the port of the hydraulic oil passage can determine the upper limit value of the pressure of the hydraulic oil in the other component, and this pressure upper limit value is the target pressure. When the pressure of the hydraulic oil in the other component exceeds the target pressure, the hydraulic oil pushes the tapered valve core 102 to flow into the fuel tank through the T port connected by the first accommodation space K1, thereby realizing the pressure release of the other component. When the pressure of the hydraulic oil in the other component is released to be less than the target pressure, the tapered valve core 102 seals the port of the hydraulic oil passage again. In this way, the pressure in the hydraulic device can be stabilized below the target pressure, avoiding failures caused by excessive pressure in the hydraulic device.

[0038] In the embodiment of the present application, the overflow valve 10 further includes a pressure detection component 104 for detecting the pressure received by the tapered valve core 102, and then enabling the force application component 105 to apply a force to the tapered valve core 102 based on the detected pressure. It is possible to compare whether the detected pressure is equal to the set required pressure. When the detected pressure (i.e., the target pressure) is not equal to the required pressure, the pressure applied by the force application component 105 to the tapered valve core 102 can be adjusted to ensure that a precise pressure is applied to the tapered valve core 102, making the target pressure equal to the required pressure. In this way, by feeding back the actually received pressure to control the pressure applied by the force application component 105, it is possible to ensure that a precise pressure is applied to the tapered valve core 102, correspondingly ensuring that the tapered valve core 102 seals the port of the hydraulic oil passage with a precise pressure, ensuring a relatively high precision in the pressure control of the hydraulic device and improving the pressure control effect of the hydraulic device.

[0039] In one embodiment, the pressure detection component 104 can be connected to the tapered valve core 102, and the pressure detection component 104 can be integrated with the force application component 105.

[0040] In summary, the overflow valve provided by the embodiment of the present application includes a pressure detection component. By this pressure detection component, the pressure received by the tapered valve core is detected, and the force application component applies a force to the tapered valve core based on this pressure. In this way, a closed-loop control of the tapered valve core can be performed, a precise pressure can be applied to the tapered valve core, ensuring that the tapered valve core seals the hydraulic oil passage of the adjusting rod with a precise pressure, so that when the pressure of the hydraulic oil reaches the specified value, the pressure is released through the overflow valve, and the overflow valve can be used to precisely control the pressure of the hydraulic device.

[0041] Figure 4 It is a structural schematic diagram of another overflow valve provided by the embodiment of the present application. As Figure 4As shown, the overflow valve 10 further includes a thrust spring 106 and a spring seat 107. The thrust spring 106 and the spring seat 107 are located on the side of the conical valve core 102 away from the adjusting rod 103. Both ends of the thrust spring 106 are respectively connected to the spring seat 107 and the side of the conical valve core 102 away from the adjusting rod 103, and this connection can be a fixed connection. Both ends of the thrust spring 106 are respectively fixed to the spring seat 107 and the base 1022 of the conical valve core 102.

[0042] The force - applying component 105 can apply a force to the spring seat 107, so as to apply a force to the conical valve core 102 through the spring seat 107 and the thrust spring 106. When the spring seat 107 receives the pressure applied by the force - applying component 105, it can move in position, and then squeeze the thrust spring 106 to apply a pressure to the conical valve core 102.

[0043] The greater the pressure applied by the force - applying component 105, the closer the position of the spring seat 107 is to the conical valve core 102, and the greater the pressure applied by the conical valve core 102 to the port of the hydraulic oil passage. There is a certain relationship among the position of the spring seat 107, the pressure applied by the force - applying component 105, and the pressure received by the conical valve core 102. The position of the spring seat 107 can reflect the pressure applied by the force - applying component 105 and can also reflect the pressure received by the conical valve core 102. In an embodiment, the pressure - detecting component 104 includes a position sensor, which is used to detect the position information of the spring seat 107, and characterize the pressure received by the conical valve core 102 through this position information. Correspondingly, the force - applying component 105 can apply a force to the spring seat 107 based on this position information, so that the spring seat 107 is located at a specified position, and correspondingly make the pressure applied by the conical valve core 102 to the port of the hydraulic oil passage reach the required pressure. For example, this position sensor can be a linear variable differential transformer (LVDT, Linear Variable Displacement Transducer).

[0044] The overflow valve 10 can be connected to an external electronic controller, and the force - applying component 105 can receive the control signal sent by the electronic controller to apply the pressure corresponding to this control signal to the spring seat 107. Please continue to refer to Figure 4, the force-applying component 105 includes a proportional amplifier 1051 and an electromagnet 1052, which can also be referred to as a proportional electromagnet. The control signal can be transmitted to the proportional amplifier 1051. After the proportional amplifier 1051 amplifies the received control signal proportionally, it is transmitted to the electromagnet 1052. The electromagnet 1052 applies a force to the conical valve core 102 based on the received signal. For example, the electromagnet 1052 adjusts its own magnetic force based on the received signal, so that the magnetic force acts on the spring seat 107 to apply a force to the spring seat 107. The proportional amplifier can be an integrated electronic component (OBE, On-Board Electronics). When the pressure detection component 104 includes a position sensor and is integrated with the force-applying component 105, the pressure detection component 104 and the force-applying component 105 can be collectively referred to as a proportional electromagnet assembly with an integrated amplifier and position feedback.

[0045] Figure 5 is a circuit schematic diagram of a relief valve provided by an embodiment of the present application. As Figure 5 shown, the proportional amplifier 1051 can include a differential amplifier. The proportional amplifier 1051 has two input terminals D and E, and the pressure detection component 104 is also connected to the input terminals of the proportional amplifier 1051. The output terminal of the proportional amplifier 1051 is connected to the electromagnet 1052. The pressure detection component 104 is also connected to the electromagnet 1052. The electromagnet 1052 is connected to the relief valve body 00, and the relief valve body 00 includes a main valve body 101, a conical valve core 102, and an adjusting rod 103.

[0046] In the embodiment of the present application, the relief valve 10 is connected to an external electronic controller. The electronic controller can control the relief valve 10 based on a current signal. Correspondingly, the control signal received by the proportional amplifier 1051 is a current signal, and the signal output by the pressure detection component 104 based on the detected information is also a current signal. The electronic controller can also control the relief valve 10 based on a voltage signal. Correspondingly, the control signal received by the proportional amplifier 1051 is a voltage signal, and the signal output by the pressure detection component 104 based on the detected information is also a voltage signal.

[0047] Figure 6 is a connection schematic diagram of a relief valve and an external electronic controller provided by an embodiment of the present application, and Figure 6 shows the situation where the electronic controller controls the relief valve through a current signal, that is, in the case where the control signal is a current signal, the connection method between the relief valve and the external electronic controller and the signal transmission situation. The relief valve 10 can have multiple pins, and each pin is used to input or output different signals. As Figure 6As shown, the overflow valve 10 has seven pins (including pins A - F and SL pin), and the connection between the overflow valve 10 and the electronic controller can be achieved through a seven - core plug. Among them, pins A and B are used to input the power supply voltage, pin C corresponds to the reference potential, pins D and E are the input terminals of the proportional amplifier 1051, pin F is the output terminal of the pressure detection component 104, and pin SL is the ground protection terminal. For example, pin A is connected to the positive pole of the power supply, pin B is connected to the negative pole of the power supply, and the input power supply voltage can be 24 volts.

[0048] As Figure 6 shown, the proportional amplifier 1051 includes a differential amplifier 1051a and a first resistor 1051b. The two input terminals of the differential amplifier 1051a are respectively connected to both ends of the first resistor 1051b. The electronic controller and the first resistor 1051b form a current loop. The electronic controller can input current to pin D, and this current signal returns through pin E. The resistance value of the first resistor 1051b can be 200 ohms. For example, the model of the control signal output by the electronic controller can be F1, and the input current range of the electronic controller can be 4 mA - 20 mA.

[0049] The pressure detection component 104 includes a sensor 1041 and a signal converter 1042. The sensor 1041 can output a voltage signal based on the detected pressure, and this voltage signal can be converted into a current signal for output through the signal converter 1042. For example, this sensor can be a position sensor connected to the spring seat 107, or this sensor can also be a pressure sensor connected to the conical valve core 102. The signal converter 1042 can be an adjustable operational amplifier, which can perform signal amplification and transformation processing. The electronic controller uses the signals transmitted by pins C and F to determine the pressure received by the conical valve core 102. Pins C and F can be connected to a detection resistor in the electronic controller. Based on this detection resistor, the current in its loop is determined, and then a current signal representing the pressure received by the conical valve core 102 is obtained. The resistance value of the detection resistor can be less than 500 ohms, such as it can be equal to 200 ohms. The reference potential terminal (that is, pin C) in the overflow valve 10 is also connected to a third resistor. The resistance value of this third resistor is small, such as the resistance value of this third resistor can be 10 ohms.

[0050] The current signal output by the signal converter 1042 can be output to the electronic controller. The electronic controller can analyze whether the pressure received by the conical valve core 102 is equal to the required pressure based on the received current signal, and accordingly transmit a control signal to the force - applying component 105, so that the force - applying component 105 applies an appropriate pressure to the conical valve core 102.

[0051] Figure 7 is another connection schematic diagram of the overflow valve and an external electronic controller provided by the embodiment of the present application, and Figure 7Shown is the situation where the electronic controller controls the overflow valve through a voltage signal, that is, when the control signal is a voltage signal, the connection method between the overflow valve and the external electronic controller and the signal transmission situation. Figure 7 in the overflow valve 10, each pin is the same as that in Figure 6 and will not be elaborated here. In this case, the model of the control signal output by the electronic controller can be A1, and the voltage range input by the electronic controller to pins D and E can be 0 to 10 volts.

[0052] As Figure 7 shown, the proportional amplifier 1051 includes a differential amplifier, and the pressure detection component 104 includes a sensor 1041 and a second resistor 1043. The voltage signal output by the sensor 1041 based on the detected pressure is output through the second resistor 1043. The resistance value of the second resistor 1043 is relatively large. For example, the resistance value of the second resistor 1043 can be 100 kΩ. Since the signals output by the differential amplifier and the sensor 1041 are voltage signals themselves, there is no need to set additional components for signal conversion.

[0053] In some embodiments, please continue to refer to Figure 4 , the overflow valve 10 further includes a return spring 108. The return spring 108 is sleeved outside the conical portion 1021 of the conical valve core 102, and both ends are respectively connected to one end of the conical portion 1021 away from the adjusting rod 103 and the fixed surface in the first accommodation space K1. Among them, the fixed surface is the interface surface between the first accommodation space K1 and the second accommodation space K2. Exemplarily, a small groove can be provided at this interface surface as a spring installation space. One end of the return spring 108 can be connected to the base 1022 of the conical valve core 102, and the other end is installed in this spring installation space. In this way, during the process of the force applying member 105 applying force to the conical valve core 102, the return spring 108 will give a certain rebounding force to the conical valve core 102, avoiding the excessive pressure exerted by the conical valve core 102 on the adjusting rod 103 and ensuring a stable minimum opening pressure.

[0054] Please continue to refer to Figure 4 , the overflow valve 10 can further include a lock nut 109, and the lock nut 109 is connected to the end of the adjusting rod 103 away from the conical valve core 102. When the position of the adjusting rod 103 in the main valve body 101 is set accurately, the lock nut 109 can be provided at the rear end of the adjusting rod 103 to fix the position of the adjusting rod 103 and avoid the displacement of the adjusting rod 103. Optionally, a part of the structure of the lock nut 109 can extend into the second accommodation space K2.

[0055] In the embodiment of the present application, in the overflow valve 10, adjusting rods 103 with different aperture diameters can be used based on the pressure requirement. The radial dimensions of the hydraulic oil channels in the adjusting rods 103 with different aperture diameters are different, and the radial dimension of the hydraulic oil channel in the adjusting rod 103 with a larger aperture diameter is larger. Exemplarily, the aperture diameter of the adjusting rod 103 used can be negatively correlated with the required pressure. If the required pressure is relatively large, the adjusting rod 103 with a smaller aperture diameter can be used.

[0056] In the embodiment of the present application, the overflow valve 10 can adopt a six-way (DN6) surface to connect with other components. The positional relationship of each screw and the opening position and size of the pipeline in this six-way surface are all fixed. Figure 8 is a schematic diagram of a six-way surface provided by the embodiment of the present application. As Figure 8 shown, four screws L and two pipeline openings (such as the P port and the T port respectively) are provided on this surface. The longitudinal distance between the two screws on the right side in the figure is 32.5 millimeters, the longitudinal distance between the two screws on the left side is 31 millimeters, and the transverse distance between the two screws on the right side and the left side is 40.5 millimeters; the longitudinal distance between the pipeline opening and the screw is 5.95 millimeters, and the transverse distance is 19 millimeters. The error of each distance is 0.1 millimeter.

[0057] In the embodiment of the present application, the maximum working pressure of the liquid inlet (P port) in the overflow valve 10 is 31.5 megapascals (MPa), and the maximum working pressure of the liquid return port (T port) is 25 MPa. The nominal flow rate between the P port and the T port in this overflow valve 10 can be less than or equal to 1 liter per minute (L / min). By using adjusting rods 103 with different aperture diameters, the overflow valve 10 can correspond to different levels of set pressures, such as it can correspond to four levels of set pressures, which are 8 MPa, 18 MPa, 25 MPa, and 31.5 MPa respectively. The hysteresis loop of this overflow valve 10 can be less than or equal to 0.2%. The response rate of the overflow valve 10 is relatively fast. For example, the response duration when it receives 100% of the control signal can be 30 milliseconds, and the response duration when it receives 10% of the control signal can be 10 milliseconds. The working temperature range of the overflow valve 10 can be from -20 °C (degrees Celsius) to +80 °C.

[0058] In the embodiment of the present application, the pressure of the P port in the overflow valve 10 acts on the conical spool through the control oil circuit, and the hydraulic pressure on the conical spool is offset by the electromagnet assembly according to the pressure set value (i.e., the aforementioned required pressure). If the hydraulic pressure exceeds the output force of the proportional electromagnet, that is, exceeds the set value of the thrust spring, the conical spool opens, and the P port and the T port are connected through the return oil circuit to maintain the stability of the inlet pressure. A position sensor and a proportional amplifier are provided on the electromagnet assembly. The pressure set value depends on the input signal of the electronic controller and is proportional to the voltage or current indicated by the input signal. The electromagnet applies pressure to the conical spool through the spring seat, the thrust spring, and the return spring. The displacement of the spring seat is detected by the position sensor, and the electronic controller can correct the deviation between the actual pressure value and the pressure set value based on the detected displacement, thereby ensuring accurate system pressure. The additional return spring outside the conical spool helps to stabilize a minimum opening pressure, and different pressure levels can be obtained for the system by changing the aperture of the adjusting rod.

[0059] In the embodiment of the present application, the overflow valve 10 is a proportional overflow valve with closed-loop pressure control, and uses a proportional electromagnet assembly with an integrated amplifier and position feedback to achieve self-closed-loop control of pressure, greatly suppressing external interference, improving the control accuracy of pressure, ensuring a short drive time and a low hysteresis, ensuring high pressure control efficiency and stability for hydraulic equipment, and thus being more suitable for practical use. In addition, the overflow valve 10 has a simple structure, good part processing technology, and can have a lower production cost.

[0060] In summary, the overflow valve provided in the embodiment of the present application includes a pressure detection component that detects the pressure received by the conical spool, and a force application component that applies force to the conical spool based on this pressure. In this way, closed-loop control of the conical spool can be carried out, accurately applying pressure to the conical spool, ensuring that the conical spool seals the hydraulic oil passage of the adjusting rod according to the accurate pressure, so that when the pressure of the hydraulic oil reaches the specified value, the pressure is released through the overflow valve, and the overflow valve can be used to accurately control the pressure of the hydraulic equipment.

[0061] The overflow valve 10 in the embodiment of the present application can be used alone to control the pressure of the hydraulic equipment. Alternatively, the overflow valve 10 can also be used as a remote control valve or a pilot valve to cooperate with the main overflow valve to limit the working pressure of the hydraulic equipment and play a pressure protection role for the executing components of the hydraulic equipment. The excellent control accuracy of the overflow valve can greatly improve the performance of the main overflow valve.

[0062] The embodiment of the present application also provides an overflow valve group, which may include a target overflow valve, and a pilot valve or a remote control valve connected to the target overflow valve. The target overflow valve is the aforementioned main overflow valve. The pilot valve or the remote control valve controls the opening and closing of the target overflow valve, and the pilot valve or the remote control valve includes any of the above-mentioned overflow valves 10.

[0063] Figure 9 This is a structural block diagram of a hydraulic device provided by an embodiment of the present application. The hydraulic device can drive other devices. For example, Figure 9 As shown, the hydraulic device may include a power component 901, a control component 902, and an execution component 903. The power component 901 provides hydraulic power for the control component 902, and the control component 902 controls the movement of the execution component 903 based on the hydraulic power. The control component 902 includes a pressure control valve, a flow control valve, and a direction control valve. The pressure control valve may include any one of the aforementioned overflow valves 10 or the aforementioned overflow valve group. Based on this overflow valve or overflow valve group, accurate pressure control of the hydraulic device can be ensured, and the working efficiency and reliability of the hydraulic device can be improved.

[0064] Exemplarily, the power component 901 may include an oil pump and its prime mover (such as an electric motor or an internal combustion engine), which can convert the mechanical energy supplied by the prime mover into the pressure energy of a fluid and output oil with a certain pressure. The control component 902 is used to control and adjust the liquid pressure, flow rate, and direction in the system from the power component to the execution component, so as to control the force, speed, and direction output by the execution component, ensuring that the main working mechanism driven by the execution component completes a predetermined motion law. The execution component 903 includes a hydraulic cylinder, a hydraulic motor, etc., which are used to convert the pressure energy of the working medium (hydraulic oil) into mechanical energy, drive the load of the working mechanism to do work, and then realize reciprocating linear motion, continuous rotary motion, or swinging, etc.

[0065] The hydraulic device also includes auxiliary components. Such as including a fuel tank, a filter, pipe fittings, a heat exchanger, an accumulator, and indicating instruments, etc. The fuel tank is used to store, provide, and recycle the working medium. The filter is used to remove impurities in the medium and maintain the cleanliness required for the normal operation of the system. The pipe fittings are used to realize the connection between components and transport the energy-carrying medium. The indicating instruments are used to display the system pressure, temperature, etc.

[0066] The above describes specific embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve the desired result. Additionally, the processes depicted in the drawings do not necessarily require the specific order or sequential order shown to achieve the desired result. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0067] Those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to the present application. In the above embodiments, each embodiment is described with its own emphasis. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0068] The preferred embodiments of the present application disclosed above are only used to help explain the present application. The alternative embodiments do not describe all the details in detail, nor do they limit the present application to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of the present application. These embodiments are selected and specifically described in order to better explain the principle and practical application of the present application, so that those skilled in the art can understand and utilize the present application well.

Claims

1. A relief valve, characterized in that: include: Main valve body, cone valve core, regulating rod, pressure detection component and force application component; The main valve body has a first accommodating space and a second accommodating space which are connected, the cone valve core is located in the first accommodating space, and the adjusting rod is located in the second accommodating space; The adjusting rod has a hydraulic oil channel, a port of the hydraulic oil channel is connected to the first accommodating space, and the cone portion of the cone valve core extends into the hydraulic oil channel through the port to seal the port; The pressure detection component detects the pressure on the cone valve core, and the force applying component applies force to the cone valve core based on the pressure; The main valve body also has a liquid inlet and a liquid return port, the liquid inlet is connected to the hydraulic oil channel, and the liquid return port is connected to the first accommodating space; the hydraulic oil flows into the hydraulic oil channel through the liquid inlet, pushes the cone valve core to separate from the port to flow into the first accommodating space, and flows out from the liquid return port.

2. The relief valve according to claim 1, characterized in that: The relief valve further comprises a thrust spring and a spring seat; the thrust spring and the spring seat are located on a side of the cone valve core away from the adjusting rod, and two ends of the thrust spring are respectively connected to the spring seat and a side of the cone valve core away from the adjusting rod; The urging member urges the spring seat based on the pressure to urge the poppet valve element through the spring seat and the thrust spring.

3. The relief valve according to claim 2, characterized in that: The pressure detection component includes a position sensor, which detects position information of the spring seat, and the position information represents the pressure applied to the cone valve core.

4. The relief valve according to claim 1, characterized in that: The force applying component includes a proportional amplifier and an electromagnet; The proportional amplifier proportionally amplifies the received control signal and transmits the amplified signal to the electromagnet. The electromagnet applies force to the poppet valve core based on the received signal.

5. The relief valve according to claim 4, characterized in that: The control signal is a current signal, the proportional amplifier includes a differential amplifier and a first resistor, and two input terminals of the differential amplifier are respectively connected to two ends of the first resistor; The pressure detection component includes a sensor and a signal converter. The voltage signal output by the sensor based on the detected pressure is converted into a current signal by the signal converter for output.

6. The relief valve according to claim 4, characterized in that: The control signal is a voltage signal, and the proportional amplifier includes a differential amplifier; The pressure detection component includes a sensor and a second resistor, and a voltage signal output by the sensor based on the detected pressure is output through the second resistor.

7. The relief valve according to claim 1, characterized in that: The liquid inlet and the liquid return port are opened in the middle area of ​​the target surface of the main valve body, the liquid inlet is connected to the hydraulic oil channel through a straight channel in the main valve body, and the liquid return port is connected to the first accommodating space through an L-shaped channel in the main valve body.

8. The overflow valve according to any one of claims 1 to 7, characterized in that: The relief valve also includes a return spring; The return spring is sleeved outside the cone portion of the cone valve core, and its two ends are respectively connected to one end of the cone portion away from the adjusting rod and a fixed surface in the first accommodating space, wherein the fixed surface is the interface between the first accommodating space and the second accommodating space.

9. A relief valve assembly, characterized in that: include: a target relief valve, and a pilot valve or a remote control valve connected to the target relief valve; The pilot valve or the remote control valve controls the opening and closing of the target relief valve, and the pilot valve or the remote control valve comprises the relief valve according to any one of claims 1 to 8.

10. A hydraulic device, characterized in that: The hydraulic equipment comprises: a power component, a control component and an execution component, wherein the power component provides hydraulic power to the control component, and the control component controls the movement of the execution component based on the hydraulic power; The control component includes a pressure control valve, a flow control valve and a directional control valve. The pressure control valve includes the overflow valve according to any one of claims 1 to 8, or the overflow valve group according to claim 9.

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