Three-position four-way proportional directional valve

Abstract

The present invention discloses a three-position four-way proportional directional valve, which relates to the technical field of three-position four-way proportional directional valves and solves the problems of complex structure and large space occupied by traditional directional valves. The valve comprises a main valve and a proportional solenoid; the valve also comprises an extrusion assembly, which is used to extrude an oil pipe in accordance with the oil outlet flow rate of the main valve and is arranged on the main valve; an adjustment assembly, which is used to adaptively adjust the angle of the oil pipe in accordance with the oil outlet flow rate and is arranged on the extrusion assembly. The present invention uses a threaded plug-in three-position four-way electromagnetic proportional directional valve product to replace the traditional plate-type three-position four-way proportional valve, reduces parts, simplifies assembly, reduces occupied space, and facilitates system integration; and optimizes the structure through the settings of a pressure-balanced valve core, a spring seat limiting the travel of a movable iron, etc., thereby enhancing the function of the directional valve product and increasing the economy.

Description

Technical Field

[0001] The invention relates to the technical field of three-position four-way proportional directional valves, in particular to a three-position four-way proportional directional valve. Background Art

[0002] Replacing the switch solenoid in the electromagnetic reversing valve with a proportional solenoid will turn it into a direct-acting proportional directional valve. The proportional directional valve can not only change position to control direction, but also the stroke of the changeover can be changed continuously, so the flow area of ​​the valve port can also be changed continuously. Therefore, the proportional directional valve can not only control the movement direction of the actuator, but also control its movement speed.

[0003] The traditional plate-type three-position four-way proportional valve has a complex structure, occupies a large space, and is not convenient for system integration. Therefore, we propose a three-position four-way proportional directional valve. Summary of the invention

[0004] The object of the present invention is to provide a three-position four-way proportional directional valve to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a three-position four-way proportional directional valve, including a main valve and a proportional solenoid; also including an extrusion assembly, which is used to extrude the oil pipe in accordance with the oil outlet flow rate of the main valve, and the extrusion assembly is arranged on the main valve; an adjustment assembly, which is used to adapt the angle of the oil pipe in accordance with the oil outlet flow rate, and the adjustment assembly is arranged on the extrusion assembly.

[0006] Preferably, the main valve includes a valve sleeve, a first oil port is provided at the end of the valve sleeve, a valve core is fitted in the gap inside the valve sleeve, a second oil port, a third oil port and a fourth oil port connected to the first oil port are penetrated through the outer surface of the valve sleeve, a balancing valve core close to the fourth oil port is provided at one end of the valve core, a screw sleeve is threadedly connected to the other end of the valve sleeve, two spring seats are provided between the valve sleeve and the inside of the screw sleeve, two springs with different stiffnesses are hung and fitted between the two spring seats, a push rod extending into the inside of the valve core is movably fitted in the middle of the spring seat, a first roller needle is plugged and fitted between the push rod and the valve core, and the valve sleeve, the valve core and the screw sleeve are sealed by a sealing member. Preferably, the proportional electromagnet includes a magnetic isolation tube threadedly connected to the sleeve, a moving iron is movably fitted inside the magnetic isolation tube, a paint cloth is provided between the moving iron and the magnetic isolation tube, a second roller is plugged and fitted between the end of the moving iron and the push rod, a fixed iron is threadedly connected to the end of the magnetic isolation tube, a locking nut is threadedly connected to the end of the fixed iron, and the outer surface of the magnetic isolation tube is connected to the first electromagnetic coil and the second electromagnetic coil.

[0007] Preferably, when the pressure of the third oil port reaches 21Mpa, the leakage of the first oil port is less than 300ml / min, the maximum working pressure of the first oil port, the second oil port, the third oil port and the fourth oil port is 21Mpa, and the maximum flow rate is 5.3L / min.

[0008] Preferably, the difference in starting current between the first electromagnetic coil and the second electromagnetic coil does not exceed 80 mA.

[0009] Preferably, the extrusion assembly includes a fixed rod and an extrusion plate connected and fixed to the magnetic isolation tube, the second oil port and the fourth oil port are connected to a first oil pipe, the third oil port is connected to a second oil pipe, the outer surfaces of the first oil pipe and the second oil pipe are both fitted with a U-shaped limit plate connected and fixed to the fixed rod, the U-shaped limit plate is provided with a limit groove that slides with the extrusion plate, the end of the moving iron is fixedly connected to a movable rod that passes through the fixed iron and the locking nut, and the U-shaped limit plate located on the first oil pipe is connected and fixed to the movable rod.

[0010] Preferably, the extrusion assembly also includes a fixed block connected and fixed to the U-shaped limit plate located on the second oil pipe, a T-slot is opened on the side of the fixed block, a T-block is slidably fitted in the T-slot, the end of the T-block is rotatably connected to a rotating rod, the end of the rotating rod is rotatably connected to a connecting rod connected and fixed to the movable rod, the middle part of the rotating rod is rotatably connected to a sliding rod, and the sliding rod is pressed against a sliding plate that is connected and fixed to the fixed rod and is distributed obliquely.

[0011] Preferably, the adjustment assembly includes three first tooth plates connected to the movable rod, the bottom of the first tooth plate is meshed with a gear that rotates with the fixed rod, the outer surface of the gear is meshed with a vertically distributed second tooth plate, the outer surface of the second tooth plate is slidably connected to a limit plate fixedly connected to the fixed rod, and the bottom of the second tooth plate is fixedly connected to a first ring and a second ring respectively sleeved on the first oil pipe and the second oil pipe.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] The present invention uses a threaded plug-in three-position four-way electromagnetic proportional directional valve product to replace the traditional plate-type three-position four-way proportional valve, thereby reducing parts, simplifying assembly, reducing occupied space, and facilitating system integration. In addition, through the settings of the pressure-balanced valve core, the spring seat limiting the movable iron stroke, etc., the structure is optimized, the function of the directional valve product is enhanced, and the economy is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0015] Figure 2 It is a cross-sectional schematic diagram of the main valve and proportional solenoid structure of the present invention;

[0016] Figure 3 for Figure 1 Schematic diagram of the structure of the middle extrusion component and the adjustment component;

[0017] Figure 4 for Figure 3 A schematic diagram of the structure of the extrusion assembly and the adjustment assembly in the first oil pipe position;

[0018] Figure 5 for Figure 4 A schematic diagram of the middle structure from the side;

[0019] Figure 6 for Figure 3 A schematic diagram of the structure of the extrusion assembly and the adjustment assembly in the second oil pipe position;

[0020] Figure 7 for Figure 6 A schematic diagram of the middle structure from the side;

[0021] Figure 8 for Figure 6 Schematic diagram of the structure viewed from above.

[0022] In the figure: 1-main valve; 2-proportional solenoid; 4-valve sleeve; 5-first oil port; 6-valve core; 7-second oil port; 8-third oil port; 9-fourth oil port; 10-balance valve core; 11-screw sleeve; 12-spring; 13-spring seat; 14-push rod; 15-first needle roller; 17-magnetic isolation tube; 18-moving iron; 19-second needle roller; 20-fixed iron; 21-locking nut; 22-first electromagnetic coil; 23-second electromagnetic coil; 24-extrusion Assembly; 25-fixed rod; 26-extrusion plate; 27-first oil pipe; 28-second oil pipe; 29-U-shaped limit plate; 30-limiting groove; 31-movable rod; 32-fixed block; 33-T-slot; 34-T-block; 35-rotating rod; 36-connecting rod; 37-sliding rod; 38-slide plate; 39-adjusting assembly; 40-first tooth plate; 41-gear; 42-second tooth plate; 43-limiting plate; 44-first ring; 45-second ring. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Embodiment 1

[0025] See also Figure 1 and Figure 3 The three-position four-way proportional directional valve shown in the figure includes a main valve 1 and a proportional solenoid 2; it also includes an extrusion component 24, which is arranged on the main valve 1 and is used to extrude the oil pipe in accordance with the oil outlet flow rate of the main valve 1; and an adjustment component 39, which is arranged on the extrusion component 24 and is used to adapt the angle of the oil pipe in accordance with the oil outlet flow rate.

[0026] In this embodiment, by optimizing the structure of the main valve 1 and the proportional solenoid 2, the number of parts is reduced, the assembly is simplified, the occupied space is reduced, and the system integration is convenient. When the solenoid valve is working, the change in the oil output drives the extrusion component 24 to squeeze the oil pipe, thereby ensuring the oil output efficiency of the oil pipe. At the same time, the adjustment component 39 for adjusting the oil pipe is cooperated to ensure that when the oil output changes, the bending length of the oil pipe increases, so that the swing and bending of the oil pipe are adaptively adjusted, which is beneficial to the oil output efficiency of the oil pipe.

[0027] Embodiment 2

[0028] See also Figure 2 The main valve 1 shown in the figure includes a valve sleeve 4, a first oil port 5 is provided at the end of the valve sleeve 4, a valve core 6 is fitted in the gap inside the valve sleeve 4, a second oil port 7, a third oil port 8 and a fourth oil port 9 which are connected to the first oil port 5 are penetrated through the outer surface of the valve sleeve 4, a balancing valve core 10 close to the fourth oil port 9 is provided at one end of the valve core 6, a screw sleeve 11 is threadedly connected at the other end of the valve sleeve 4, two spring seats 13 are provided between the valve sleeve 4 and the inside of the screw sleeve 11, two springs 12 with different stiffnesses are hung and fitted between the two spring seats 13, a push rod 14 extending into the inside of the valve core 6 is movably fitted in the middle of the spring seat 13, a first roller needle 15 is inserted and fitted between the push rod 14 and the valve core 6, and the valve sleeve 4, the valve core 6 and the screw sleeve 11 are sealed by a sealing member.

[0029] See also Figure 2 The proportional electromagnet 2 shown in the figure includes a magnetic isolation tube 17 threadedly connected to the screw sleeve 11, a moving iron 18 is movably fitted inside the magnetic isolation tube 17, a paint cloth is provided between the moving iron 18 and the magnetic isolation tube 17, a second needle roller 19 is plugged and fitted between the end of the moving iron 18 and the push rod 14, a fixed iron 20 is threadedly connected to the end of the magnetic isolation tube 17, a locking nut 21 is threadedly connected to the end of the fixed iron 20, and a first electromagnetic coil 22 and a second electromagnetic coil 23 are connected to the outer surface of the magnetic isolation tube 17.

[0030] Among them, when the pressure of the third oil port 8 reaches 21Mpa, the leakage of the first oil port 5 is less than 300ml / min, the maximum working pressure of the first oil port 5, the second oil port 7, the third oil port 8 and the fourth oil port 9 is 21Mpa, and the maximum flow rate is 5.3L / min, and the starting current difference between the first electromagnetic coil 22 and the second electromagnetic coil 23 does not exceed 80mA.

[0031] See also Figure 4-Figure 5 The extrusion assembly 24 shown in the figure includes a fixed rod 25 and an extrusion plate 26 connected and fixed to the magnetic isolation tube 17, the second oil port 7 and the fourth oil port 9 are connected to the first oil pipe 27, and the third oil port 8 is connected to the second oil pipe 28. The outer surfaces of the first oil pipe 27 and the second oil pipe 28 are both fitted with a U-shaped limit plate 29 connected and fixed to the fixed rod 25. The U-shaped limit plate 29 is provided with a limit groove 30 that slides with the extrusion plate 26. The end of the moving iron 18 is fixedly connected to a movable rod 31 that passes through the fixed iron 20 and the locking nut 21, and the U-shaped limit plate 29 on the first oil pipe 27 is fixedly connected to the movable rod 31.

[0032] See also Figure 3-Figure 6 The adjustment assembly 39 shown in the figure includes three first tooth plates 40 connected to the movable rod 31. The bottom of the first tooth plate 40 is meshed with a gear 41 that rotates with the fixed rod 25. The outer surface of the gear 41 is meshed with a vertically distributed second tooth plate 42. The outer surface of the second tooth plate 42 is slidably connected with a limit plate 43 that is connected and fixed to the fixed rod 25. The bottom of the second tooth plate 42 is fixedly connected with a first ring 44 and a second ring 45 that are respectively sleeved on the first oil pipe 27 and the second oil pipe 28.

[0033] In this embodiment, in the main structure design, this structure is mainly composed of a main valve 1 part and a proportional electromagnet 2 part. The main valve 1 part is composed of a valve sleeve 4, a valve core 6, a balance valve core 10, a screw sleeve 11, a spring 12, a spring seat 13, a seal and a push rod 14; the proportional electromagnet 2 part is composed of a magnetic isolation tube 17, a moving iron 18, a polytetrafluoroethylene paint cloth, a fixed iron 20, a locking nut 21 and a first electromagnetic coil 22 and a second electromagnetic coil 23. The inner hole of the valve sleeve 4 is a straight hole, the outer circle is a stepped outer circle, and three sealing grooves are arranged. The left end is an external thread, and three groups of radial oil holes are arranged between the groove and the external thread. The oil ports are marked as the second oil port 7, the third oil port 8 and the fourth oil port 9, and the oil port at the right end of the valve sleeve 4 is marked as the first oil port 5. The valve sleeve 4 is internally provided with a valve core 6, and the outer circle of the valve core 6 and the inner hole of the valve sleeve 4 are clearance-matched, and there is a stepped through hole inside. The outer circle of the valve core 6 is provided with a groove valve, and radial oil holes are provided in the groove. The edges of the outer circle groove of the valve core 6 and the radial holes of the valve sleeve 4 are matched through positive and negative covers to form the on-off function of the oil circuit. The left end of the valve sleeve 4 is a screw sleeve 11, the right end of the screw sleeve 11 is an external thread, and the rear part of the external thread is a sealing ring groove. The left end is a section of cylinder and external thread, and a sealing groove is provided on the cylinder. The middle is an external hexagon. The inside of the screw sleeve 11 is a step hole, and the right end is an internal thread, and the rear part of the internal thread is a step hole. The external thread at the left end of the valve sleeve 4 is connected with the internal thread of the screw sleeve 11. Two spring seats 13 are provided between the left end face of the valve sleeve 4 and the internal step of the screw sleeve 11, and two springs 12 are provided between the two spring seats 13. Inside the spring seat 13 is a push rod 14, and the right end of the push rod 14 extends into the inside of the valve core 6, and is connected to the valve core 6 with a roller needle, and slides in the inner hole of the valve sleeve 4. The push rod 14 is provided with a step near the end surface of the left spring seat 13 , and the step limits the spring seat 13 .

[0034] The inside of the magnetic isolation tube 17 is a straight through hole, and the two ends are internal threads. The external thread at the left end of the screw sleeve 11 is connected with the internal thread at the right end of the magnetic isolation tube 17, and the cylindrical sealing groove extends into the straight through hole inside the magnetic isolation tube 17 to form a sealing structure. A moving iron 18 is arranged inside the magnetic isolation tube 17, and a polytetrafluoroethylene paint cloth is arranged between the moving iron 18 and the magnetic isolation tube 17, and the right end of the moving iron 18 and the left end of the push rod 14 are connected by a roller needle. The right end of the fixed iron 20 is a section of cylinder and external thread, and a sealing groove is arranged on the cylinder. The external thread is connected with the internal thread at the left end of the magnetic isolation tube 17, and the cylindrical sealing groove extends into the straight through hole inside the magnetic isolation tube 17 to form a sealing structure. The left end of the fixed iron 20 is an external thread, which is connected with the internal thread of the locking nut 21, so that the locking nut 21 fixes the first electromagnetic coil 22 and the second electromagnetic coil 23 between the hexagon of the screw sleeve 11 and the locking nut 21.

[0035] In the initial position, the second oil port 7 and the fourth oil port 9 are both connected to the first oil port 5, but not to the third oil port 8, and throttling is required from the second oil port 7 and the fourth oil port 9 to the first oil port 5. In order to realize the throttling function in the initial position, the radial holes of the second oil port 7 and the fourth oil port 9 of the valve sleeve 4 need to be set to be staggered, so that the axial positions of the radial holes are staggered by a distance to produce a suitable throttling effect. The valve core 6 is kept in the position shown in the figure under the pre-compression force of the two springs 12, and the moving iron 18 is also in the middle position of the magnetic isolation sleeve.

[0036] When the first electromagnetic coil 22 is energized, the movable iron 18 overcomes the pre-compression force of the spring 12 and moves to the left under the action of the electromagnetic force, and drives the push rod 14 and the valve core 6 to move to the left together through the needle roller, and the left end spring seat 13 is limited inside the screw sleeve 11, and the right end spring seat 13 moves to the left to compress the spring 12. The third oil port 8 is gradually connected to the fourth oil port 9, and the second oil port 7 is gradually connected to the first oil port 5. As the current in the first electromagnetic coil 22 continues to increase, the electromagnetic force generated continues to increase, and the valve core 6 continues to move to the left, and the opening amount from the third oil port 8 to the fourth oil port 9, and from the second oil port 7 to the first oil port 5 continues to increase until the current in the first electromagnetic coil 22 reaches the maximum, the displacement of the valve core 6 also reaches the maximum, and the opening amount of this proportional directional valve reaches the maximum, achieving the maximum flow rate. As the current in the first electromagnetic coil 22 continues to decrease, the generated electromagnetic force also continues to decrease. Under the action of the compression force of the valve core 6 spring 12, the valve core 6 continuously moves to the right, and the opening volume from the third oil port 8 to the fourth oil port 9 and from the second oil port 7 to the first oil port 5 continuously decreases until it returns to the initial state.

[0037] When the second electromagnetic coil 23 is energized, the moving iron 18 overcomes the pre-compression force of the spring 12 and moves to the right under the action of the electromagnetic force, and drives the push rod 14 and the valve core 6 to move to the right together through the needle roller. The right end spring seat 13 is limited at the left end of the valve sleeve 4, and the left end spring seat 13 moves to the right to compress the spring 12, and the third oil port 8 is gradually connected to the second oil port 7, and the fourth oil port 9 is gradually connected to the first oil port 5. As the current in the second electromagnetic coil 23 continues to increase, the electromagnetic force generated continues to increase, and the valve core 6 continues to move to the right, and the third oil port 8 is connected to the second oil port 7. , the opening amount from the fourth oil port 9 to the first oil port 5 continues to increase until the current in the second electromagnetic coil 23 reaches a maximum, the displacement of the valve core 6 also reaches a maximum, and the opening amount of this proportional directional valve reaches a maximum, achieving a maximum flow rate. As the current in the second electromagnetic coil 23 continues to decrease, the electromagnetic force generated also continues to decrease. Under the action of the compression force of the valve core 6 spring 12, the valve core 6 continuously moves to the left, and the opening amount from the third oil port 8 to the second oil port 7 and the fourth oil port 9 to the first oil port 5 continuously decreases until it returns to its initial state.

[0038] Among them, in the structural design of the magnetic isolation tube 17 and the moving iron 18, this structure is a three-position four-way valve, that is, the valve core 6 needs to be kept in three positions to control the mutual connection and disconnection of the four oil ports. The movement of the valve core 6 is driven by the moving iron 18, so the moving iron 18 needs to move in two directions and maintain the initial position. The movement of the moving iron 18 relies on the electromagnetic force generated by the first electromagnetic coil 22, the second electromagnetic coil 23 and the magnetic isolation tube 17, and the generation of appropriate electromagnetic force requires the cooperation of the magnetic isolation tube 17 and the moving iron 18, which includes the length of the moving iron 18, the diameter of the moving iron 18, the length of the magnetic isolation tube 17, the angle and axial relative position of the magnetic isolation ring, the radial gap between the outer diameter of the moving iron 18 and the inner hole of the magnetic isolation tube 17, and the relative position between the end face of the moving iron 18 and the magnetic isolation ring. In this structure, the first electromagnetic coil 22 and the second electromagnetic coil 23 adopt existing products. According to the relevant parameters of the coils, the outer diameter and length of the magnetic isolation tube 17 can be preliminarily designed; according to the electromagnetic force formula, the diameter of the moving iron 18 can be preliminarily determined, thereby determining the inner hole diameter of the magnetic isolation tube 17; according to the proportional electromagnet 2 theory, the relevant parameters of the magnetic isolation ring can be designed; and according to the overall electromagnet theory, the relative position of the magnetic isolation ring and the moving iron 18 can be determined, and then through the test verification of the actual product, the detailed parameters are partially modified, and after multiple verifications, the structural parameters of the final magnetic isolation tube 17 and the moving iron 18 of this structure can be determined.

[0039] Among them, in the design of the limiting structure of the moving iron 18, the output force of the attraction section of the proportional electromagnet 2 cannot be used. Usually, a non-magnetic gasket is added to the end face of the moving iron 18 to limit the moving iron 18 from entering the attraction area. In this structure, the moving iron 18 needs to move to the left and right ends, that is, the left and right ends need to be attracted respectively, which requires non-magnetic limiting gaskets to be set at both ends of the moving iron 18. In this structure, non-magnetic gaskets are set at both ends of the moving iron 18, which is structurally difficult to achieve and will bring uncontrollable factors, such as sticking. Therefore, in this structure, no limiting gaskets are set at both ends of the moving iron 18, and the limiting function is transferred to the spring seat 13. When the moving iron 18 moves to the maximum displacement, the two end faces of the spring seats 13 are in contact, thereby limiting the maximum displacement of the moving iron 18.

[0040] It is worth noting that: the pressure balancing valve core 10 in the present structure is arranged at a position inside the valve core 6 near the fourth oil port 9 of the valve sleeve 4, so as to change the flow direction of the pressure oil entering the radial hole of the valve core 6 from the fourth oil port 9 and further reduce the pressure. On the one hand, the pressure oil is prevented from entering the spring 12 cavity, and on the other hand, the pressure of the first oil port 5 is introduced into the spring 12 cavity, so as to ensure the pressure balance at the left and right ends of the valve core 6 and make the valve core 6 only bear the force of the spring 12.

[0041] It is worth noting that the spring seat 13 in the present structure limits the stroke of the movable iron 18. The present structure relies on the cooperation of the two spring seats 13, the push rod 14 and the needle roller to connect the movable iron 18 and the valve core 6 as one. While limiting the stroke of the valve core 6, it also limits the stroke of the movable iron 18. The stroke limitation of the movable iron 18 is achieved by relying on the original parts, and one part is reduced, which simplifies the assembly and achieves the expected goal.

[0042] It is worth noting that: in this structure, large and small stiffness springs 12 are set, and the spring seat 13 has two steps. Two springs 12 are set between the two steps of the spring seat 13. The outer spring 12 has a thick wire diameter and a large stiffness, and the inner spring 12 has a thin wire diameter and a small stiffness. In the initial state, the large stiffness spring 12 has no pre-compression, and the small stiffness spring 12 has a pre-compression. The initial spring 12 force is relatively small. Due to structural limitations, the force generated by the first electromagnetic coil 22 of the threaded plug-in three-position four-way electromagnet is smaller than the force generated by the second electromagnetic coil 23. In order to ensure that the two electromagnets cannot change the starting current of the valve core 6 greatly, this structure controls the dead zone current of the two electromagnets by changing the starting spring 12 force of the valve core 6. After crossing the dead zone current, the large stiffness spring 12 works again, which not only ensures that the valve core 6 is reliably reset, but also controls the dead zone current of the two electromagnets to be basically consistent.

[0043] Among them, the main economic and technical indicators are: the maximum working pressure of the first oil port 5, the second oil port 7, the third oil port 8 and the fourth oil port 9 is 21Mpa, and the maximum flow rate is 5.3L / min; when the pressure of the third oil port 8 is 21MPa, the leakage of the first oil port 5 is less than 300ml / min; the starting current difference between the first electromagnetic coil 22 and the second electromagnetic coil 23 does not exceed 80mA; the matching coil is 24VDC, the current range is 300~800mA, and the corresponding flow range is 0~5.5L / min.

[0044] At the same time, when the movable iron 18 moves, it drives the movable rod 31 to move, so that the extrusion plate 26 is close to or away from the U-shaped limit plate 29, thereby squeezing or relaxing the first oil pipe 27. When the movable iron 18 drives the push rod 14 to move and the oil output gradually decreases, the extrusion plate 26 squeezes the first oil pipe 27 to ensure the oil output speed in the oil pipe. When the oil output gradually increases, the extrusion plate 26 relaxes the first oil pipe 27 to ensure the oil output speed in the oil pipe. When the movable rod 31 moves, it drives the first tooth plate 40 to move, so that the gear 41 The gear 41 rotates and drives the second tooth plate 42 in the vertical state to move, thereby driving the first ring 44 and the second ring 45 to move up and down, so that the fixed point positions of the first oil pipe 27 and the second oil pipe 28 change. When the oil output increases, the first oil pipe 27 and the second oil pipe 28 are subjected to the impact force, resulting in a larger bend. At this time, the first ring 44 and the second ring 45 move upward, so that the bending length of the first oil pipe 27 and the second oil pipe 28 is increased, and adaptive angle adjustment is made to avoid bending, which is beneficial to the oil output efficiency of the oil pipe.

[0045] Embodiment 3

[0046] See also Figure 6-Figure 7 The extrusion assembly 24 shown in the figure also includes a fixed block 32 connected and fixed to the U-shaped limit plate 29 located on the second oil pipe 28. A T-slot 33 is opened on the side of the fixed block 32. A T-block 34 is slidably fitted in the T-slot 33. A rotating rod 35 is rotatably connected to the end of the T-block 34. A connecting rod 36 connected and fixed to the movable rod 31 is rotatably connected to the end of the rotating rod 35. A sliding rod 37 is rotatably connected to the middle of the rotating rod 35. The sliding rod 37 is pressed against a slide plate 38 that is connected and fixed to the fixed rod 25 and is distributed obliquely.

[0047] In this embodiment, since the diameter of the second oil pipe 28 is greater than the diameter of the first oil pipe 27, the distance that the extrusion plate 26 needs to move to extrude the second oil pipe 28 is greater than the distance that the extrusion plate 26 needs to move to extrude the first oil pipe 27. During the movement of the movable rod 31, the rotating rod 35 is driven to move. At the same time, under the action of the sliding rod 37 and the inclined sliding plate 38, the horizontally moving rotating rod 35 rotates at the same time, driving the fixed block 32 to move. The movement amount of the filing block is larger than the movement amount of the movable rod 31. Under the action of the T-slot 33 and the T-block 34, the fixed block 32 moves along the horizontal position in cooperation with the limiting groove 30 on the U-shaped limiting plate 29 at the fixed position and the extrusion plate 26, so that the extrusion plate 26 extrudes the second oil pipe 28 in cooperation with the U-shaped limiting plate 29. It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not expressly listed, or also includes elements inherent to such process, method, article, or apparatus.

[0048] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Three-position four-way proportional directional valve, characterized in that: include: Main valve (1) and proportional solenoid (2); Also includes: An extrusion assembly (24), used for extruding the oil pipe in accordance with the oil outlet flow rate of the main valve (1), the extrusion assembly (24) being arranged on the main valve (1); an adjusting component (39), which is used to adjust the angle of the oil pipe in accordance with the oil outlet flow rate, and is disposed on the extrusion component (24); The main valve (1) comprises a valve sleeve (4), a first oil port (5) is provided at the end of the valve sleeve (4), a valve core (6) is fitted in the gap inside the valve sleeve (4), a second oil port (7), a third oil port (8) and a fourth oil port (9) which are connected to the first oil port (5) are penetrated through the outer surface of the valve sleeve (4), a balancing valve core (10) close to the fourth oil port (9) is provided at one end of the valve core (6), a screw sleeve (11) is threadedly connected at the other end of the valve sleeve (4), two spring seats are provided between the valve sleeve (4) and the inside of the screw sleeve (11), two springs (12) with different stiffnesses are hung and fitted between the two spring seats (13), a push rod (14) extending into the inside of the valve core (6) is movably fitted in the middle of the spring seat (13), a first roller needle (15) is inserted and fitted between the push rod (14) and the valve core (6), and a sealing treatment is performed between the valve sleeve (4), the valve core (6) and the screw sleeve (11) by a sealing member; The proportional electromagnet (2) comprises a magnetic isolation tube (17) threadedly connected to the screw sleeve (11), a movable iron (18) is movably fitted inside the magnetic isolation tube (17), a paint cloth is provided between the movable iron (18) and the magnetic isolation tube (17), a second roller needle (19) is plugged and fitted between the end of the movable iron (18) and the push rod (14), a fixed iron (20) is threadedly connected to the end of the magnetic isolation tube (17), a locking nut (21) is threadedly connected to the end of the fixed iron (20), and a first electromagnetic coil (22) and a second electromagnetic coil (23) are connected to the outer surface of the magnetic isolation tube (17); The extrusion assembly (24) comprises a fixed rod (25) and an extrusion plate (26) connected and fixed to the magnetic isolation tube (17); the second oil port (7) and the fourth oil port (9) are connected to a first oil pipe (27); the third oil port (8) is connected to a second oil pipe (28); the outer surfaces of the first oil pipe (27) and the second oil pipe (28) are both fitted with a U-shaped limit plate (29) connected and fixed to the fixed rod (25); the U-shaped limit plate (29) is provided with a limit groove (30) that slidably cooperates with the extrusion plate (26); the end of the moving iron (18) is fixedly connected to a movable rod (31) that passes through the fixed iron (20) and the locking nut (21); the U-shaped limit plate (29) located on the first oil pipe (27) is connected and fixed to the movable rod (31); The extrusion assembly (24) further comprises a fixed block (32) connected and fixed to the U-shaped limiting plate (29) located on the second oil pipe (28); a T-shaped slot (33) is provided on a side of the fixed block (32); a T-shaped block (34) is slidably fitted in the T-shaped slot (33); an end of the T-shaped block (34) is rotatably connected to a rotating rod (35); an end of the rotating rod (35) is rotatably connected to a connecting rod (36) connected and fixed to the movable rod (31); a middle portion of the rotating rod (35) is rotatably connected to a sliding rod (37); the sliding rod (37) is pressed against a sliding plate (38) connected and fixed to the fixed rod (25) and arranged in an inclined manner; The adjustment assembly (39) comprises three first tooth plates (40) connected and fixed to the movable rod (31); the bottom of the first tooth plate (40) is meshed with a gear (41) that rotates with the fixed rod (25); the outer surface of the gear (41) is meshed with a vertically distributed second tooth plate (42); the outer surface of the second tooth plate (42) is slidably connected with a limit plate (43) connected and fixed to the fixed rod (25); the bottom of the second tooth plate (42) is fixedly connected with a first ring (44) and a second ring (45) that are respectively sleeved on the first oil pipe (27) and the second oil pipe (28).

2. The three-position four-way proportional directional valve according to claim 1, characterized in that: When the pressure of the third oil port (8) reaches 21 MPa, the leakage of the first oil port (5) is less than 300 ml / min, the maximum working pressure of the first oil port (5), the second oil port (7), the third oil port (8) and the fourth oil port (9) is 21 MPa, and the maximum flow rate is 5.3 L / min.

3. The three-position four-way proportional directional valve according to claim 2, characterized in that: The difference in starting current between the first electromagnetic coil (22) and the second electromagnetic coil (23) does not exceed 80 mA.

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