Proportional reversing device

Abstract

The utility model relates to a proportional reversing device, which belongs to the technical field of hydraulic equipment manufacturing, and comprises a main valve, a pressure reducing valve, a pilot-operated control valve, an input / output interface and a built-in control panel which are sequentially connected, the pilot-operated type control valve comprises a first electromagnetic coil, a pilot-operated type control valve element and a second electromagnetic coil which are sequentially connected, one end of the pilot-operated type control valve element is connected with one end of the first electromagnetic coil, and the other end of the pilot-operated type control valve element is connected with one end of the second electromagnetic coil. The other end of the displacement sensor, the other end of the first electromagnetic coil and the other end of the second electromagnetic coil are all connected with an electrical control structure of an external control circuit through a built-in control panel and an input and output interface. The problem that an existing proportional reversing device cannot accurately control hydraulic flow is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydraulic equipment manufacturing technical field especially relates to a proportional reversing device. BACKGROUND

[0002] Generally, the constant pressure variable pump is used to extract the power of the aero-engine under different rotating speeds, the constant pressure variable pump is an accessory customized by the aero-engine manufacturer, and the service life is limited, and the constant pressure variable pump needs to be replaced or returned to the factory for maintenance once the service life is exceeded, so that the long test experiment of the aero-engine cannot be met. In order to overcome this problem, the hydraulic motor is used to replace the constant pressure variable pump, the mechanical rotation work of the aero-engine is converted into hydraulic work by the hydraulic motor, and the aero-engine power is extracted by detecting the hydraulic work. The service life of the hydraulic motor is far more than that of the constant pressure variable pump, and the cost is low, and the universality is good, so that the long test experiment of the aero-engine can be met.

[0003] However, the method for converting the rotation work of the aero-engine into hydraulic work by the hydraulic motor to extract the aero-engine power cannot realize accurate control of the hydraulic oil flow of the hydraulic oil circuit, so that the accuracy of the extracted aero-engine power is not ideal. CONTENT OF THE UTILITY MODEL

[0004] In view of the above analysis, the utility model aims at providing a proportional reversing device to solve the problem that the existing proportional reversing device cannot accurately control the hydraulic flow.

[0005] The utility model mainly aims at realizing the following technical schemes:

[0006] A proportional reversing device, the device comprises a built-in control board, an input and output interface, and a main valve, a pilot control valve and a pressure reducing valve connected in sequence, wherein,

[0007] The main valve comprises a main valve spool and a displacement sensor, wherein one end of the main valve spool is connected to one end of the displacement sensor;

[0008] The pilot control valve comprises a first electromagnetic coil, a pilot control valve spool and a second electromagnetic coil connected in sequence, one end of the pilot control valve spool is connected to one end of the first electromagnetic coil, and the other end of the pilot control valve spool is connected to one end of the second electromagnetic coil;

[0009] The other end of the displacement sensor, the other end of the first electromagnetic coil and the other end of the second electromagnetic coil are connected to an external control circuit through the built-in control board and the input and output interface.

[0010] Based on the further improvement of the above scheme, the main valve further comprises a first valve cover, a main valve body and a second valve cover sealed and attached in sequence, wherein,

[0011] The main valve body is provided with a transversely penetrating main valve sliding cavity, and the main valve spool is sleeved in the main valve sliding cavity,

[0012] The first valve cover is provided with a first valve cover groove at a position corresponding to the main valve sliding cavity, and the first valve cover groove is provided with a main valve spring.

[0013] The second valve cover is provided with a second valve cover groove at a position corresponding to the main valve sliding cavity, and the other end of the main valve spool is located in the second valve cover groove.

[0014] Based on the further improvement of the above scheme, the inside of the second valve cover groove is further provided with a through hole penetrating to the outside of the second valve cover; the displacement sensor includes a displacement sensor coil and a displacement sensor connecting rod connected with each other, wherein the displacement sensor connecting rod penetrates through the through hole and extends into the second valve cover groove and is connected to the other end of the main valve spool, and the displacement sensor coil is arranged at a position corresponding to the through hole on the outside of the second valve cover; the outside of the second valve cover is provided with a shielding cavity, and the displacement sensor coil and the built-in control board are located in the shielding cavity.

[0015] Based on the further improvement of the above scheme, the main valve is further provided with an oil inlet, a first oil outlet and a second oil outlet, the oil inlet is connected to the main valve sliding cavity from the middle of the bottom of the main valve body upward, the first oil outlet and the second oil outlet are respectively arranged on both sides of the oil inlet and are parallel to the oil inlet and are respectively connected to the main valve sliding cavity from the bottom of the main valve body upward.

[0016] Based on the further improvement of the above scheme, the main valve is further provided with a first control oil path, and the inlet of the first control oil path is arranged at a position close to the first valve cover on the middle of the top of the main valve body, and the outlet of the first control oil path is located in the first valve cover groove.

[0017] Based on the further improvement of the above scheme, the main valve is further provided with a second control oil path, and the outlet of the second control oil path is located at a position close to the second valve cover on the middle of the top of the main valve body, and the inlet of the second control oil path is located in the second valve cover groove.

[0018] Based on the further improvement of the above scheme, the pilot control valve further includes a first spring, a pilot control valve body and a second spring connected in sequence; the middle of the pilot control valve body is provided with a transversely penetrating pilot control valve sliding cavity; and the pilot control valve spool is sleeved in the pilot control valve sliding cavity.

[0019] Based on the further improvement of the above scheme, the pilot control valve control oil way comprises a third control oil way, wherein the third control oil way inlet is arranged at the middle of the bottom of the valve body of the pilot control valve and close to the second spring, and the control oil way outlet is arranged at the middle of the bottom of the valve body of the pilot control valve and close to the first spring.

[0020] Based on the further improvement of the above scheme, the pressure reducing valve comprises a pressure reducing valve valve body, a pressure reducing valve spool, and an uplink oil way, wherein a transverse through pressure reducing valve sliding cavity is arranged in the middle of the pressure reducing valve valve body, and the pressure reducing valve spool is sleeved in the pressure reducing valve sliding cavity.

[0021] The uplink oil way comprises an uplink oil way front section and an uplink oil way rear section, wherein the uplink oil way rear section outlet is located at the top of the pressure reducing valve valve body and corresponds to the pilot control valve control oil way inlet position.

[0022] The uplink oil way front section is connected with the pressure reducing valve spool.

[0023] Based on the further improvement of the above scheme, the pressure reducing valve further comprises a downlink oil way, wherein the pressure reducing valve downlink oil way inlet is located at the top of the pressure reducing valve valve body and is connected with the pilot control valve control oil way outlet, and the pressure reducing valve downlink oil way outlet is located at the bottom of the pressure reducing valve valve body and is connected with the first control oil way inlet.

[0024] Compared with the prior art, the utility model can realize at least one of the following beneficial effects:

[0025] 1. The pilot control valve, the pressure reducing valve and the main valve are sequentially connected, which can alleviate the impact of power mutation in the pressure reducing valve on the pilot control valve, and ensure the safety and reliability of the power extraction oil way.

[0026] 2. The first electromagnetic coil and the second electromagnetic coil connected to the two ends of the pilot control valve spool are both connected with the built-in control board, which can ensure the linear change of the pilot control valve spool based on the control of the built-in control board, and can realize the precise control of the main valve spool based on the control oil way connected among the pilot control valve, the pressure reducing valve and the main valve, and can realize the precise control of the oil flow in the hydraulic oil way, so that the accurate aviation engine power can be extracted.

[0027] In the utility model, the above technical schemes can be combined with each other to realize more preferred combination schemes. Other features and advantages of the utility model will be described in the following content, and some advantages can become apparent from the description or can be understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained from the content specially pointed out in the description and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0028] The accompanying drawings are only used for the purpose of illustrating specific embodiments and are not to be considered as limiting the present invention. Throughout the accompanying drawings, the same reference symbols denote the same components.

[0029] Figure 1 This is a schematic diagram of the overall structure of the proportional reversing device according to an embodiment of the present utility model.

[0030] Figure 2 This is a schematic diagram of the structure of a pressure reducing valve according to an embodiment of the present utility model.

[0031] Reference numerals:

[0032] 1- Pilot-operated control valve body; 2- Pilot-operated control valve spool; 3- Pressure reducing valve; 4- Main valve spring; 5- First valve cover; 5a- First valve cover groove; 6- Second valve cover; 6a- Second valve cover groove; 6b- Through hole in the second valve cover groove; 7- Main valve spool; 8- Main valve body; 9a- Displacement sensor coil; 9b- Displacement sensor connecting rod; 10- First solenoid coil; 11- Second solenoid coil; 12- First solenoid coil power supply plug; 13- Second solenoid coil power supply plug; 14- Input / output interface; 15- Built-in control board; 16- Shielding chamber; 17- First spring; 18- Second spring; P- Oil inlet; A- First oil outlet; B- Second oil outlet; T- Oil drain port; C1- First control oil circuit; C2- Second control oil circuit; D1- Third control oil circuit outlet; D2- Third control oil circuit inlet; DETAILED DESCRIPTION

[0033] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, and are not used to limit the scope of the present invention.

[0034] A specific embodiment of the present utility model discloses a proportional reversing device, such as Figure 1 The device includes a built-in control panel 15, an input and output interface 14, and a main valve, a pressure reducing valve, and a pilot control valve connected in sequence, wherein:

[0035] The main valve includes a main valve core 7 and a displacement sensor, wherein one end of the main valve core 7 is connected to one end of the displacement sensor;

[0036] The pilot control valve comprises a first electromagnetic coil 10, a pilot control valve core 2, and a second electromagnetic coil 11 connected in sequence, wherein one end of the pilot control valve core 2 is connected to one end of the first electromagnetic coil 10, and the other end of the pilot control valve core 2 is connected to one end of the second electromagnetic coil 11;

[0037] The other end of the displacement sensor, the other end of the first electromagnetic coil 10, and the other end of the second electromagnetic coil 11 are connected to the external control circuit through the built-in control board 15 and the input and output interface 14.

[0038] To meet the precise control requirements of the extraction power of the aero-engine and ensure the safety in use when applied to the power extraction of high-power aero-engine, the device comprises a built-in control board, an input and output interface, and a main valve, a pressure reducing valve, and a pilot control valve connected in sequence, wherein the main valve, the pressure reducing valve, and the pilot control valve are separate components, and based on the application requirements of the extraction power of the aero-engine, the main valve, the pressure reducing valve, and the pilot control valve are optionally connected in a whole through coarse threads or flanges; the main valve comprises a main valve spool and a displacement sensor, one end of the main valve spool is connected to one end of the displacement sensor, the displacement of the main valve spool is collected through the displacement sensor, the main valve is connected to a hydraulic oil circuit for extracting the power of the aero-engine, hydraulic oil in the hydraulic oil circuit flows into the main valve, and the flow of the hydraulic oil is controlled based on the opening of the main valve spool. To achieve this purpose, the main valve provides the following structure:

[0039] Further, the main valve further comprises a first valve cover 5, a main valve body 8, and a second valve cover 6 which are sequentially sealed and attached, wherein,

[0040] A main valve sliding cavity which is transversely through is arranged in the middle of the main valve body 8, and the main valve spool 7 is sleeved in the main valve sliding cavity,

[0041] A first valve cover groove 5a is arranged at the corresponding position of the inner side of the first valve cover 5 and the main valve sliding cavity, a main valve spring 4 is arranged in the first valve cover groove 5a, and one end of the main valve spool 7 is connected to the main valve spring 4.

[0042] A second valve cover groove 6a is arranged at the corresponding position of the inner side of the second valve cover 6 and the main valve sliding cavity, and the other end of the main valve spool 7 is located in the second valve cover groove 6a.

[0043] Further, a through hole 6b which penetrates to the outer side of the second valve cover is further arranged at the inner side of the second valve cover groove 6a; the displacement sensor comprises a displacement sensor coil 9a and a displacement sensor connecting rod 9b which are connected to each other, wherein the displacement sensor connecting rod 9b penetrates through the through hole and extends into the second valve cover groove 6a and is connected to the other end of the main valve spool 7, the displacement sensor coil 9a is arranged at the corresponding position of the through hole 6b on the outer side of the second valve cover 6, and the outer side of the second valve cover 6 is provided with a shielding cavity 16, and the displacement sensor coil 9a and the built-in control board 15 are located in the shielding cavity 16.

[0044] Specifically, the middle part of the main valve body 8 is provided with a transverse through main valve sliding cavity, the main valve spool 7 is tightly sleeved in the main valve sliding cavity and can reciprocate in the main valve sliding cavity, the shape of the main valve sliding cavity is adapted to the shape of the main valve spool 7, the two ends of the main valve spool 7 are appropriately extended from the two side surfaces of the main valve sliding cavity by a certain length to facilitate subsequent assembly, and the main valve spool 7 is a column body with a certain shape in cross section.

[0045] Optionally, the cross section of the main valve spool 7 is one of a circle, a triangle and a square, and preferably, the cross section of the main valve spool 7 is a circle.

[0046] Optionally, the main valve body 8 is an integrally formed cast iron piece to enhance the stability of the overall structure and improve wear resistance and lubricity.

[0047] The two sides of the main valve body 8 are respectively sealed and attached to the first valve cover 5 and the second valve cover 6.

[0048] Optionally, to realize structural stability and ensure sealing, the main valve body 8, the first valve cover 5 and the second valve cover 6 can be connected as a whole by welding or bolts.

[0049] The inner side of the first valve cover 5 is provided with a first valve cover groove 5a, the inner side of the second valve cover 6 is provided with a second valve cover groove 6a, the opening position of the first valve cover groove 5a and the opening position of the second valve cover groove 6a are respectively opposite to one end of the main valve sliding cavity, the opening of the first valve cover groove 5a and the opening of the second valve cover groove 6a are both the same as the cross section shape of the inner diameter of the main valve sliding cavity, recesses for placing sealing rings are arranged on the main valve body at the edges of the two ends of the main valve sliding cavity, the two ends of the main valve spool 7 respectively pass through the sealing rings and extend into the first valve cover groove 5a and the second valve cover groove 6a, and the sealing rings are respectively placed in the recesses arranged on the main valve body at the edges of the two ends of the main valve sliding cavity, when the first valve cover, the main valve body and the second valve cover are sequentially sealed and attached, the first valve cover groove and the second valve cover groove realize sealing isolation from the main valve sliding cavity through the sealing rings.

[0050] The first valve cover groove 5a is provided with the main valve spring 4, and one end of the main valve spool 7 is connected with the main valve spring 4; the inner side of the second valve cover groove 6a is further provided with a through hole 6b penetrating to the outer side of the second valve cover, the displacement sensor connecting rod 9b passes through the through hole and extends into the second valve cover groove 6a and is connected with the other end of the main valve spool 7, the displacement sensor coil 9a is fixedly arranged at the position corresponding to the through hole 6b on the outer side of the second valve cover 6, and the one end of the main valve spool 7 in the second valve cover groove leaves a spare space from the innermost side of the second valve cover groove. Since the main valve is controlled by hydraulic pressure, the thrust of the hydraulic pressure generated by the hydraulic oil in the first valve cover groove 5a is superposed with the elastic force of the main valve spring 4, and the opposite pressure of the hydraulic pressure generated by the hydraulic oil in the second valve cover groove 6a is balanced with the main valve spool 7, and the opening degree of the main valve is controlled by adjusting the hydraulic pressure at the two ends of the main valve spool 7.

[0051] Further, the main valve is further provided with an oil inlet path P, a first oil outlet path A, and a second oil outlet path B. The oil inlet path P is connected to the main valve sliding cavity from the middle of the bottom of the main valve body 8 upward. The first oil outlet path A and the second oil outlet path B are respectively arranged on both sides of the oil inlet path P and are parallel to the oil inlet path P and are respectively connected to the main valve sliding cavity from the bottom of the main valve body 8 upward.

[0052] Further, the main valve is further provided with a first control oil path C1. The inlet of the first control oil path C1 is arranged at the middle of the top of the main valve body 7 close to the first valve cover 5. The outlet of the first control oil path C1 is located in the first valve cover groove 5a.

[0053] Further, the main valve is further provided with a second control oil path C2. The outlet of the second control oil path C2 is located at the middle of the top of the main valve body 7 close to the second valve cover 6. The inlet of the second control oil path C2 is located in the second valve cover groove 6a.

[0054] The proportional reversing device controls the displacement of the main valve spool 7 through the hydraulic oil path to realize the hydraulic control of the extraction power of the aero-engine. The control oil path in the main valve and the hydraulic oil path for extracting power are independent of each other. The hydraulic oil path for extracting power includes the oil inlet path P, the first oil outlet path A, and the second oil outlet path B. The positions of the oil inlet path P, the first oil outlet path A, and the second oil outlet path B correspond to the main valve spool 7. The oil inlet path P, the first oil outlet path A, and the second oil outlet path B are respectively arranged on both sides of the oil inlet path P and are respectively connected to the main valve sliding cavity from the bottom of the main valve body 8 upward. When the main valve is fully closed, the position of the main valve spool 7 completely blocks the oil inlet path P. The main valve spool 7 can select to open the oil path from the oil inlet path P to the first oil outlet path A or the oil path from the oil inlet path P to the second oil outlet path B by moving, thereby realizing the reversing.

[0055] The main valve control oil path includes the first control oil path C1 and the second control oil path C2. One end of the first control oil path C1 is connected to the first valve cover groove 5a. One end of the second control oil path C2 is connected to the second valve cover groove 6a. Different hydraulic pressures are applied to both ends of the main valve spool 7 to make the main valve spool 7 move, thereby adjusting the opening degree of the oil path from the oil inlet path P to the first oil outlet path A or the second oil outlet path B.

[0056] When the main valve spool 7 moves, the displacement sensor connecting rod 9a is driven to move by the main valve spool 7, which causes the displacement sensor coil 9b to generate a displacement signal and send it to the built-in control board 15. The built-in control board 15 sends the displacement signal to the external control circuit. The second valve cover 6 is provided with a shielding cavity 16. The displacement sensor coil 9a and the built-in control board 15 are located in the shielding cavity 16.

[0057] Because of the complex environment when the aero-engine extracts power, there are many electrical interference noises, and the displacement sensor is easy to be disturbed when collecting the moving signal of the main valve core 7, therefore, the shielding cavity 16 is arranged outside the second valve cover 6, and the displacement sensor coil 9a and the built-in control board 15 are arranged in the shielding cavity 16, which can effectively shield the electrical noise from disturbing the displacement sensor, and help to obtain more accurate displacement data of the main valve core 7, and facilitate more accurate control of the main valve.

[0058] For the purpose of accurate control, the main valve is controlled by the pilot control valve, therefore, the main valve control oil way and the pilot control valve oil way are communicated to generate control hydraulic pressure to realize the control of the main valve core. The pilot control valve provides an electrically controlled hydraulic valve structure, which specifically comprises a first electromagnetic coil 10, a pilot control valve core 2 and a second electromagnetic coil 11 which are connected in sequence, and further comprises a first spring 17, a pilot control valve body 1 and a second spring 18 which are connected in sequence; the pilot control valve body 1 is provided with a transversely penetrating pilot control valve sliding cavity in the middle; the pilot control valve core 2 is sleeved in the pilot control valve sliding cavity.

[0059] Specifically, the mechanical connection structure of the pilot control valve comprises the pilot control valve body 1, wherein the pilot control valve body 1 is provided with a transversely penetrating pilot control valve sliding cavity in the middle, and the sliding cavity is provided with valve covers which are in airtight connection with the pilot control valve sliding cavity on both sides; the first spring 17 and the second spring 18 are arranged in the inner cavities of the valve covers on both sides; the pilot control valve core 2 is sleeved in the pilot control valve sliding cavity, and the pilot control valve core 2 is connected with the first spring 17 and the second spring 18 at both ends; the first spring 17 and the second spring 18 generate relative elastic force on the pilot control valve core 2.

[0060] The first electromagnetic coil 10 is arranged outside the valve cover where the first spring 17 is located, and the second electromagnetic coil 11 is arranged outside the valve cover where the second spring 18 is located; the first electromagnetic coil 10 is opposite to the first spring 17, and the second electromagnetic coil 11 is opposite to the second spring 18; the first electromagnetic coil 10 is connected with the built-in control board 15 through the first electromagnetic coil power supply plug 12, and the second electromagnetic coil 11 is connected with the built-in control board 15 through the second electromagnetic coil power supply plug 13; the external control circuit is connected with the built-in control board 15 through the input and output interface 14; the external control circuit supplies power and sends control commands to the first electromagnetic coil power supply plug 12 and the second electromagnetic coil power supply plug 13 through the input and output interface 14 and the built-in control board 15; the electromagnetic force of the first electromagnetic coil 10 and the second electromagnetic coil 11 is adjusted through electrical control, so as to change the stress of the first spring 17 and the second spring 18 which are connected with both ends of the pilot control valve core 2 respectively, and cause the movement of the pilot control valve core 2, so as to adjust the control of the pilot control valve control oil way.

[0061] Further, the pilot control valve control oil path includes a third control oil path, wherein the third control oil path inlet D2 is arranged at the bottom of the pilot control valve valve body 1 close to the second spring 18, and the control oil path outlet D1 is arranged at the bottom of the pilot control valve valve body 1 close to the first spring 17.

[0062] A pressure reducing valve is arranged between the main valve and the pilot control valve, the first control oil path and the second control oil path included in the main valve are connected to the third control oil path of the pilot control valve through the pressure reducing valve, and the whole control oil path of the proportional reversing device is formed.

[0063] In the prior art, the third control oil path inlet of the pilot control valve is connected to the first control oil path of the main valve, the third control oil path outlet of the pilot control valve is connected to the second control oil path of the main valve, and the hydraulic pressure of the first valve cover groove 5a and the second valve cover groove 6a is adjusted by adjusting the hydraulic pressure of the third control oil path inlet of the pilot control valve and the hydraulic pressure of the third control oil path outlet of the pilot control valve through the spool of the pilot control valve, so as to move the spool 7 of the main valve.

[0064] When the aircraft engine starts or stops, or the speed changes, the hydraulic oil path for extracting engine power changes, and the power change is conducted to the spool 7 of the main valve through the hydraulic oil path for extracting engine power, and then conducted to the third control oil path of the pilot control valve through the first control oil path C1 and the second control oil path C2, which may cause the spool 2 of the pilot control valve to vibrate and cause errors. By adding a pressure reducing valve between the main valve and the pilot control valve, the purpose is to eliminate the errors caused by power mutation.

[0065] Further, the pressure reducing valve includes a pressure reducing valve valve body, a pressure reducing valve spool, and an upward oil path, wherein a transverse through pressure reducing valve sliding cavity is arranged in the middle of the pressure reducing valve valve body, and the pressure reducing valve spool is sleeved in the pressure reducing valve sliding cavity.

[0066] The upward oil path includes an upward oil path front section and an upward oil path rear section, wherein the upward oil path rear section outlet A1 is located at the top of the pressure reducing valve valve body, and the pilot control valve control oil path inlet D2 is docked.

[0067] The upward oil path front section is connected to the pressure reducing valve spool.

[0068] Further, the pressure reducing valve further includes a downward oil path; the pressure reducing valve downward oil path inlet B1 is located at the top of the pressure reducing valve valve body, and the pilot control valve control oil path outlet D1 is docked; the pressure reducing valve downward oil path outlet B2 is located at the bottom of the pressure reducing valve valve body, and the first control oil path C1 inlet is docked.

[0069] Specifically, the middle part of the pressure reducing valve body is provided with a transverse through pressure reducing valve sliding cavity, and the pressure reducing valve spool is sleeved in the pressure reducing valve sliding cavity; the pressure reducing valve is further provided with an uplink oil way, a downlink oil way, a downlink oil way inlet B1 and a pilot control valve control oil way D1 are connected, and a downlink oil way outlet B2 and a main valve first control oil way C1 are connected at the top of the main valve body, thereby forming a pilot control valve control oil way connected through the downlink oil way of the pressure reducing valve and the first control oil way of the main valve.

[0070] The uplink oil way comprises an uplink oil way front section and an uplink oil way rear section, wherein the uplink oil way rear section outlet A1 is connected with the pilot control valve control oil way inlet D2; the uplink oil way front section is connected with the pressure reducing valve spool, so that the uplink oil way front section can move with the pressure reducing valve spool, and when a power mutation occurs in the hydraulic oil way, the uplink oil way front section can be moved by the pressure reducing valve spool to cut off the passage between the main valve second control oil way C2 outlet and the pilot control valve control oil way inlet D2.

[0071] Preferably, the main valve body 8, the pressure reducing valve body and the pilot control valve body 1 are made of cast iron; the main valve spool 7, the pressure reducing valve spool and the pilot control valve spool 2 are made of low-carbon alloy steel after heat treatment; and the main valve spring 4, the first spring 17 and the second spring 18 are made of 55CrSi spring steel wire.

[0072] The proportional reversing device disclosed in the embodiment comprises a main valve, a pressure reducing valve, a pilot control valve, an input / output interface and a built-in control board connected in sequence, wherein the main valve comprises a displacement sensor connected with the main valve spool, the pilot control valve comprises a first electromagnetic coil, a pilot control valve spool and a second electromagnetic coil connected in sequence, one end of the pilot control valve spool is connected with one end of the first electromagnetic coil, the other end of the pilot control valve spool is connected with one end of the second electromagnetic coil, the other end of the displacement sensor, the other end of the first electromagnetic coil and the other end of the second electromagnetic coil are all connected with an electrical control structure of an external control circuit through the built-in control board and the input / output interface, and compared with the prior art, the precise control of the amount of hydraulic oil in the hydraulic oil way can be realized.

[0073] Those skilled in the art can understand that the programs / software involved in the above embodiments are common methods in the prior art, and the utility model does not involve any improvement in software. The utility model only needs to connect the devices with corresponding functions through the connection relationship given in the utility model embodiments, and does not involve any improvement in program / software. As for the connection mode between the hardware devices with corresponding functions, it can be realized by using the prior art, and will not be described in detail here.

[0074] The above merely describes a preferred embodiment of the present application, and the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A proportional commutation device, characterized by, The device comprises a built-in control board, an input-output interface, and a main valve, a pressure reducing valve, and a pilot control valve connected in sequence, wherein, The main valve comprises a main valve spool and a displacement sensor, wherein one end of the main valve spool is connected to one end of the displacement sensor; The pilot control valve comprises a first electromagnetic coil, a pilot control valve spool, and a second electromagnetic coil connected in sequence, wherein one end of the pilot control valve spool is connected to one end of the first electromagnetic coil, and the other end of the pilot control valve spool is connected to one end of the second electromagnetic coil; The other end of the displacement sensor, the other end of the first electromagnetic coil, and the other end of the second electromagnetic coil are all connected to an external control circuit through the built-in control board and the input-output interface.

2. A proportional commutation device according to claim 1, characterised in that The main valve further comprises a first valve cover, a main valve body, and a second valve cover sealed and attached in sequence, wherein, The main valve body is provided with a main valve sliding cavity passing through the middle part in the transverse direction, and the main valve spool is sleeved in the main valve sliding cavity, The inner side of the first valve cover is provided with a first valve cover groove at a position corresponding to the main valve sliding cavity, the first valve cover groove is provided with a main valve spring, and one end of the main valve spool is connected to the main valve spring; The inner side of the second valve cover is provided with a second valve cover groove at a position corresponding to the main valve sliding cavity, and the other end of the main valve spool is located in the second valve cover groove.

3. A proportional commutation device according to claim 2, characterised in that The inner side of the second valve cover groove is further provided with a through hole passing through to the outer side of the second valve cover; the displacement sensor comprises a displacement sensor coil and a displacement sensor connecting rod connected to each other, wherein the displacement sensor connecting rod passes through the through hole and extends into the second valve cover groove and is connected to the other end of the main valve spool, and the displacement sensor coil is arranged at a position corresponding to the through hole on the outer side of the second valve cover; the outer side of the second valve cover is provided with a shielding cavity, and the displacement sensor coil and the built-in control board are located in the shielding cavity.

4. A proportional commutation device according to claim 3, characterised in that The main valve is further provided with an oil inlet, a first oil outlet, and a second oil outlet, the oil inlet is connected to the main valve sliding cavity from the bottom of the main valve body in the middle and upward, the first oil outlet and the second oil outlet are respectively arranged on both sides of the oil inlet and are parallel to the oil inlet and are respectively connected to the main valve sliding cavity from the bottom of the main valve body and upward.

5. A proportional commutation device according to claim 4, characterised in that, The main valve is further provided with a first control oil path, the inlet of the first control oil path is arranged at the top of the main valve body in the middle and close to the first valve cover, and the outlet of the first control oil path is located in the first valve cover groove.

6. A proportional commutation device according to claim 5, wherein The main valve is further provided with a second control oil path, the outlet of the second control oil path is located at the top of the main valve body in the middle and close to the second valve cover, and the inlet of the second control oil path is located in the second valve cover groove.

7. A proportional commutation device according to claim 6, characterised in that The pilot control valve further comprises a first spring, a pilot control valve body, and a second spring connected in sequence; the pilot control valve body is provided with a pilot control valve sliding cavity passing through the middle part in the transverse direction; and the pilot control valve spool is sleeved in the pilot control valve sliding cavity.

8. A proportional commutation device according to claim 7, characterised in that, The pilot control valve control oil path comprises a third control oil path, wherein the third control oil path inlet is arranged at the middle of the bottom of the valve body of the pilot control valve, close to the second spring, and the control oil path outlet is arranged at the middle of the bottom of the valve body of the pilot control valve, close to the first spring.

9. A proportional commutation device according to claim 8, characterised in that, The pressure reducing valve comprises a valve body, a valve core, and an uplink oil path, wherein a transverse sliding cavity is arranged in the middle of the valve body of the pressure reducing valve, and the valve core is sleeved in the sliding cavity of the pressure reducing valve; The uplink oil path comprises a front section and a rear section, wherein the outlet of the rear section is located at the top of the valve body of the pressure reducing valve, and corresponds to the position of the inlet of the pilot control valve control oil path; The front section of the uplink oil path is connected with the valve core of the pressure reducing valve.

10. A proportional commutation device as claimed in claim 9, characterised in that The pressure reducing valve further comprises a downlink oil path, wherein the inlet of the downlink oil path is located at the top of the valve body of the pressure reducing valve, and is connected with the outlet of the pilot control valve control oil path; the outlet of the downlink oil path is located at the bottom of the valve body of the pressure reducing valve, and is connected with the inlet of the first control oil path.

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