Threaded plug-in two-dimensional electro-hydraulic proportional valve for rubber mixing mill pitch adjustment system

Abstract

The present invention discloses a threaded plug-in two-dimensional electro-hydraulic proportional valve for a rubber mixing mill pitch adjustment system, comprising a valve sleeve, a left screw plug threadedly matched with the inner cavity of the left part of the valve sleeve, a valve core embedded in the inner cavity of the valve sleeve, a motor directly connected to the right end of the valve core and installed on the right end of the valve sleeve, a radial zero adjustment component connected to the motor outer rotor of the motor, and an LVDT detection module or an angular displacement detection module installed on the right end of the motor; the left part of the valve sleeve is threadedly matched into the valve body. The present invention can be combined with the plug-in valve structure used in the outer rotor motor, and has the advantages of the outer rotor motor with simple structure, large torque, good heat dissipation, and simple assembly; the axial movement buffer is realized through the axial double spring structure; the angular displacement detection or linear displacement detection is realized through the angular displacement sensor detection or linear displacement sensor detection to complete the servo control; the plug-in assembly is realized through the external thread on the valve sleeve, and after the integrated valve block is quickly matched, the two-dimensional electro-hydraulic servo control can be realized.

Description

[Technical field]

[0001] The invention relates to the technical field of threaded cartridge valves, in particular to the technical field of threaded cartridge type two-dimensional electro-hydraulic proportional valves for rubber mixing mill pitch adjustment systems. [Background technology]

[0002] Due to the stable quality of rubber mixing, easy process control, great production flexibility, low price and simple structure, the rubber mixing mill has always occupied a high share in the rubber production line, especially in my country's rubber production and processing enterprises. The mixing mill continuously squeezes and shears the rubber through rollers to change the properties of the rubber to achieve the purpose of mixing. In the rubber mixing process, the roller distance directly affects the squeezing and shearing effect of the rollers on the rubber, and also directly affects the final mixing effect and product quality. Therefore, it plays a very important role in the rubber mixing process.

[0003] The application of hydraulic pitch adjustment technology in rubber mixing mills has greatly improved the technical level of the pitch adjustment system of the mixing mill, making the roller pitch adjustment more convenient and the position accuracy higher, and overcoming the defects and shortcomings of manual and electric pitch adjustment systems, such as large labor and low precision. In particular, the improvement and improvement in the personal safety protection of equipment and operators has largely ensured the continuity of the production process and the personal safety of operators. However, the hydraulic pitch adjustment system still has problems such as insufficient pitch adjustment accuracy, small safety margin and high manufacturing cost, which need further research and solution.

[0004] The threaded cartridge valve uses liquid as the medium. In the hydraulic system, it can adjust and control the fluid direction, flow rate, pressure and other oil circuit actions through mechanical or electrical means; its installation form is a threaded hydraulic actuator. The threaded cartridge valve has many advantages such as easy processing, simple assembly, easy disassembly, strong interchangeability, high degree of integration, relatively simple structure and suitability for mass production. It has been widely used in mechanical engineering such as agricultural machinery, cranes, disassembly equipment, drilling equipment, etc., and is an important development direction in the field of mobile machinery.

[0005] The outer rotor motor has a simple structure, small axial size, high specific power, can control torque in a wide speed range, and has a fast response speed. Because there is no reducer, it has high efficiency. Therefore, a motor-driven threaded plug-in two-dimensional valve can be designed in combination with the characteristics of the outer rotor motor. In order to accurately control the electro-hydraulic servo valve, it is necessary to measure the angular displacement of the valve core or the linear displacement of the axial movement; during the operation of the existing electro-hydraulic servo valve, the valve core will produce frequent axial movement, so this axial movement needs to be buffered. [Summary of the invention]

[0006] The purpose of the present invention is to solve the problems in the prior art and to propose a threaded plug-in two-dimensional electro-hydraulic proportional valve for a rubber mixing mill pitch adjustment system. The plug-in valve structure can be used in combination with an external rotor motor, and has the advantages of a simple structure, large torque, good heat dissipation, and simple assembly of the external rotor motor. The axial movement buffer is achieved through an axial double spring structure. Angular displacement detection or linear displacement detection is achieved through angular displacement sensing detection or linear displacement sensing detection to complete servo control. Plug-in assembly is achieved through the external thread on the valve sleeve, and after quick cooperation with the integrated valve block, two-dimensional electro-hydraulic servo control can be achieved.

[0007] To achieve the above-mentioned purpose, the present invention proposes a threaded plug-in two-dimensional electro-hydraulic proportional valve for a rubber mixing mill pitch adjustment system, comprising a valve sleeve, a left screw plug threadedly matched with an inner cavity of the left portion of the valve sleeve, a valve core embedded in the inner cavity of the valve sleeve, a motor directly connected to the right end of the valve core and installed on the right end of the valve sleeve, a radial zero adjustment component connected to an outer rotor of the motor, and an LVDT detection module or an angular displacement detection module installed on the right end of the motor; the left portion of the valve sleeve is threadedly matched into the valve body;

[0008] The motor comprises a motor cover fixed on the valve sleeve, a stator winding embedded in the outer periphery of the right part of the valve sleeve, a motor outer rotor magnet sleeved on the outer periphery of the stator winding, a motor outer rotor matched with the motor outer rotor magnet, and an outer rotor sleeve sleeved on the outer periphery of the motor outer rotor and the outer rotor magnet;

[0009] The right inner cavity thread of the valve sleeve is matched with a right end cover, and the inner cavity of the right end cover is protruded with an annular limit shoulder, and axial return springs are symmetrically matched on both sides of the limit shoulder. The left end of the axial return spring on the left side and the right end of the axial return spring on the right side are respectively matched with axial spring seats, and the left end of the axial spring seat on the left side and the right end of the axial spring seat on the right side are respectively matched with thrust bearings, the left side surface of the thrust bearing at the left end abuts against the shoulder on the valve core, and the right side surface of the thrust bearing at the right end abuts against the inner bottom surface of the outer rotor of the motor, the thrust bearing, the axial spring seat and the axial return spring are all mounted on the outer periphery of the right end of the valve core, and brass sleeves are embedded on the inner cavity wall surface of the right end cover on both sides of the limit shoulder, and the inner wall surface of the brass sleeves matches the outer peripheral surface of the axial spring seat.

[0010] Preferably, the left end of the left screw plug has an internal hexagonal groove, the outer circumferential surface of the left screw plug is provided with an external thread, the inner wall surface of the left inner cavity of the valve sleeve is provided with an internal thread, and the left screw plug thread is matched with the inner cavity of the left part of the valve sleeve.

[0011] Preferably, an external thread is provided on the outer peripheral surface of the middle part of the valve sleeve, and the valve sleeve is fitted into the valve body through the external thread; a fixing plate is provided on the outer periphery of the right part of the valve sleeve, and a lug is provided on the edge of the fixing plate, and the valve sleeve fixes the motor cover through the lug; an internal thread is provided on the inner cavity wall surface of the right part of the valve sleeve, an external thread is provided on the outer peripheral surface of the left part of the right end cover, and the right thread of the valve sleeve is fitted with the right end cover.

[0012] Preferably, the left end inner cavity of the valve core is embedded with a left plugging piece of the valve core, and the valve core is a full-bridge type or a half-bridge type. The left and right outer circumferential surfaces of the full-bridge type valve core are respectively provided with concentric rings, and the outer circumference of the valve core on the right side of the concentric ring on the right side is provided with a right cover plate, and the inner cavity wall surface of the left screw plug and the inner cavity wall surface of the right cover plate are both provided with annular grooves, and the annular grooves are equipped with Step seals and O-rings, and the O-rings are sleeved on the outer circumference of the Step seal; the half-bridge type valve core is respectively provided with concentric rings on the outer circumference of the right part of the valve core, and the right cover plate is installed on the outer circumference of the valve core, and the inner cavity wall surface of the right cover plate is provided with annular grooves, and the annular grooves are equipped with Step seals and O-rings, and the O-rings are sleeved on the outer circumference of the Step seal.

[0013] Preferably, a radial zero adjustment component is provided on the annular sleeve 3 protruding outwardly in the middle of the right end of the outer rotor of the motor; magnetic steel grooves 3 are evenly distributed circumferentially on the left side of the outer rotor, and the magnetic steel grooves 3 are provided with the magnets of the outer rotor of the motor.

[0014] Preferably, the LVDT detection module includes an LVDT sensing core connector, an LVDT sensing core and an LVDT body. The LVDT sensing core connector is embedded in the right end of the valve core. The inner cavity thread of the right end of the LVDT sensing core connector is equipped with the LVDT sensing core. The LVDT sensing core is embedded in the inner cavity of the left part of the LVDT body. The LVDT body is fixed to the right part of the motor cover by bolts.

[0015] Preferably, the radial zeroing assembly comprises an angular displacement transmission fork, a radial zeroing screw, and a rotational return spring; the angular displacement transmission fork is fixed on an annular sleeve 3 protruding outside the middle of the right end of the outer rotor of the motor; blind holes are provided on both sides of the upper part of the angular displacement transmission fork and a rotational return spring is fitted in the blind holes; a radial zeroing seat is provided on the right side surface of the right end cover, a radial zeroing threaded hole is longitudinally provided on the radial zeroing seat, and a radial zeroing screw is fitted in the inner thread of the radial zeroing threaded hole, and the end of the radial zeroing screw is fitted with the rotational return spring.

[0016] Preferably, the angular displacement detection module includes a ruby ​​ball head, a ruby ​​ball head rod, a ruby ​​ball head shaft, a needle bearing, an angular displacement sensor magnet, a magnetic steel window end cover, and an angular displacement sensor body. The right end of the motor cover is fixed with a magnetic steel window end cover and an angular displacement sensor body in sequence by bolts. A needle bearing is laterally fixed inside the right end of the motor cover, and a ruby ​​ball head shaft is embedded in the needle bearing. The angular displacement sensor magnet is embedded inside the right end of the lower part of the ruby ​​ball head shaft, a ruby ​​ball head rod is laterally embedded in the upper part of the ruby ​​ball head shaft, and a ruby ​​ball head is mounted on the left end of the ruby ​​ball head rod. The ruby ​​ball head fits in the slot above the angular displacement transmission fork, and the angular displacement transmission fork is fixed to the middle of the right end of the motor outer rotor; the right inner cavity of the valve core is embedded with the valve core right plugging member.

[0017] Beneficial effects of the present invention: The present invention realizes angle transmission through the angular displacement transmission fork or realizes linear displacement detection by directly connecting the valve core to the LVDT induction core head; the double spring structure can buffer the axial movement of the valve core; the design of the external threaded valve sleeve can realize plug-in installation, and the application scenarios are more extensive; the radial adjustment seat on the right end cover is used to realize radial zero adjustment by using the radial adjustment screw. The present invention also has the advantages of an external rotor motor.

[0018] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings.

Brief Description of the Drawings

[0019] Figure 1 It is a stereoscopic diagram of a first embodiment of a threaded plug-in type two-dimensional electro-hydraulic proportional valve for a rubber mixing mill pitch adjustment system of the present invention;

[0020] Figure 2 It is a front cross-sectional view of the first embodiment of the threaded plug-in type two-dimensional electro-hydraulic proportional valve for the rubber mixing mill pitch adjustment system of the present invention;

[0021] Figure 3 The present invention Figure 2 AA section view in;

[0022] Figure 4 It is a three-dimensional diagram of the left screw plug of the first embodiment of the threaded plug-in type two-dimensional electro-hydraulic proportional valve for the rubber mixing mill pitch adjustment system of the present invention;

[0023] Figure 5 It is a three-dimensional view of the valve sleeve of the first embodiment of the threaded plug-in type two-dimensional electro-hydraulic proportional valve for the rubber mixing mill pitch adjustment system of the present invention;

[0024] Figure 6 It is a three-dimensional diagram of the valve core of the first embodiment of the threaded plug-in type two-dimensional electro-hydraulic proportional valve for the rubber mixing mill pitch adjustment system of the present invention;

[0025] Figure 7 It is a three-dimensional diagram of the right end cover of the first embodiment of the threaded plug-in two-dimensional electro-hydraulic proportional valve for the rubber mixing mill pitch adjustment system of the present invention;

[0026] Figure 8 It is a concentric ring stereogram of a first embodiment of a threaded plug-in type two-dimensional electro-hydraulic proportional valve for a rubber mixing mill pitch adjustment system of the present invention;

[0027] Fig. 9 It is a three-dimensional diagram of the right cover plate of the first embodiment of the threaded plug-in type two-dimensional electro-hydraulic proportional valve for the rubber mixing mill pitch adjustment system of the present invention;

[0028] Fig.10 It is a three-dimensional diagram of the motor cover of the first embodiment of the threaded plug-in type two-dimensional electro-hydraulic proportional valve for the rubber mixing mill pitch adjustment system of the present invention;

[0029] Fig.11 It is a stereoscopic diagram of the outer rotor of the motor of the first embodiment of the threaded plug-in type two-dimensional electro-hydraulic proportional valve for the rubber mixing mill pitch adjustment system of the present invention;

[0030] Fig.12 It is a stereoscopic diagram of the LVDT main body of the first embodiment of the threaded plug-in type two-dimensional electro-hydraulic proportional valve for the rubber mixing mill pitch adjustment system of the present invention;

[0031] Fig.13 It is a stereoscopic view of the angular displacement transmission fork of the first embodiment of the threaded plug-in type two-dimensional electro-hydraulic proportional valve for the rubber mixing mill pitch adjustment system of the present invention;

[0032] Fig.14 It is a stereoscopic diagram of a second embodiment of a threaded plug-in type two-dimensional electro-hydraulic proportional valve for a rubber mixing mill pitch adjustment system of the present invention;

[0033] Fig.15 It is a front cross-sectional view of a second embodiment of a threaded plug-in type two-dimensional electro-hydraulic proportional valve for a rubber mixing mill pitch adjustment system of the present invention;

[0034] Fig.16 It is a three-dimensional view of the valve sleeve of the second embodiment of the threaded plug-in type two-dimensional electro-hydraulic proportional valve for the rubber mixing mill pitch adjustment system of the present invention;

[0035] Fig.17 It is a three-dimensional diagram of the valve core of the second embodiment of the threaded plug-in type two-dimensional electro-hydraulic proportional valve for the rubber mixing mill pitch adjustment system of the present invention;

[0036] Fig.18 It is a stereoscopic diagram of the third embodiment of the threaded plug-in type two-dimensional electro-hydraulic proportional valve for the rubber mixing mill pitch adjustment system of the present invention;

[0037] Fig.19 It is a front cross-sectional view of a third embodiment of a threaded plug-in two-dimensional electro-hydraulic proportional valve for a rubber mixing mill pitch adjustment system according to the present invention;

[0038] Fig. 20 The present invention Fig.19 BB section diagram in;

[0039] Fig.21 It is a three-dimensional diagram of the motor cover of the third embodiment of the threaded plug-in type two-dimensional electro-hydraulic proportional valve for the rubber mixing mill pitch adjustment system of the present invention;

[0040] Fig. 22 It is a three-dimensional diagram of the angular displacement transmission fork of the third embodiment of the threaded plug-in type two-dimensional electro-hydraulic proportional valve for the rubber mixing mill pitch adjustment system of the present invention;

[0041] Fig.23It is a stereoscopic view of the ruby ​​ball head shaft of the third embodiment of the threaded plug-in type two-dimensional electro-hydraulic proportional valve for the rubber mixing mill pitch adjustment system of the present invention;

[0042] Fig.24 It is a stereoscopic view of the magnetic steel window end cover of the third embodiment of the threaded plug-in two-dimensional electro-hydraulic proportional valve for the rubber mixing mill pitch adjustment system of the present invention.

[0043] In the figure: 1-left screw plug, 2-valve sleeve, 201-fixed plate, 202-lug, 21-right end cover, 2101-limiting shoulder, 2102-radial zero adjustment seat, 2103-radial zero adjustment threaded hole, 22-thrust bearing, 23-axial spring seat, 24-axial return spring, 25-brass sleeve, 3-valve core, 31-valve core left plugging piece, 32-concentric ring, 33-right cover plate, 34-valve core right plugging piece, 4-motor, 41-motor cover, 42-outer rotor sleeve, 43-motor outer rotor, 44-motor outer rotor magnet, 45 -Stator winding, 5-LVDT detection module, 51-LVDT sensing core connector, 52-LVDT sensing core, 53-LVDT body, 6-radial zero adjustment assembly, 61-angular displacement transfer fork, 6101-blind hole, 62-radial zero adjustment screw, 63-rotational reset spring, 7-angular displacement detection module, 71-ruby ball head, 72-ruby ball head rod, 73-ruby ball head shaft, 74-needle bearing, 75-angular displacement sensor magnet, 76-magnet window end cover, 77-angular displacement sensor body, 8-aviation plug. [Specific implementation method]

[0044] See also Figure 1-Figure 24 The present invention comprises a valve sleeve 2, a left screw plug 1 threadedly fitted in the inner cavity of the left part of the valve sleeve 2, a valve core 3 embedded in the inner cavity of the valve sleeve 2, a motor 4 directly connected to the right end of the valve core 3 and installed on the right end of the valve sleeve 2, a radial zero adjustment component 6 connected to the motor outer rotor 43 of the motor 4, and an LVDT detection module 5 or an angular displacement detection module 7 installed on the right end of the motor 4; the left part of the valve sleeve 2 is threadedly fitted into the valve body;

[0045] The motor 4 comprises a motor cover 41 fixed on the valve sleeve 2, a stator winding 45 embedded in the outer periphery of the right part of the valve sleeve 2, a motor outer rotor magnet 44 sleeved on the outer periphery of the stator winding 45, a motor outer rotor 43 matched with the motor outer rotor magnet 44, and an outer rotor sleeve 42 sleeved on the outer periphery of the motor outer rotor 43 and the outer rotor magnet 44;

[0046] The right inner cavity thread of the valve sleeve 2 is matched with a right end cover 21, and the inner cavity of the right end cover 21 is raised with an annular limiting shoulder 2101. Axial return springs 24 are symmetrically matched on both sides of the limiting shoulder 2101. The left end of the axial return spring 24 on the left and the right end of the axial return spring 24 on the right are respectively matched with axial spring seats 23. The left end of the axial spring seat 23 on the left and the right end of the axial spring seat 23 on the right are respectively matched with thrust bearings 22. The left side surface of the thrust bearing 22 at the left end abuts against the shoulder on the valve core 3, and the right side surface of the thrust bearing 22 at the right end abuts against the inner bottom surface of the motor outer rotor 43. The thrust bearing 22, the axial spring seat 23, and the axial return spring 24 are all sleeved on the outer periphery of the right end of the valve core 3. Brass sleeves 25 are embedded on the inner cavity wall surface of the right end cover 21 on both sides of the limiting shoulder 2101, and the inner wall surface of the brass sleeve 25 matches the outer peripheral surface of the axial spring seat 23.

[0047] Specifically, the left end of the left screw plug 1 has an inner hexagonal groove, the outer circumferential surface of the left screw plug 1 is provided with an external thread, the left inner cavity wall of the valve sleeve 2 is provided with an internal thread, and the left screw plug 1 thread is matched with the left inner cavity of the valve sleeve 2.

[0048] Specifically, an external thread is provided on the outer peripheral surface of the middle part of the valve sleeve 2, and the valve sleeve 2 is fitted into the valve body through the external thread; a fixing plate 201 is provided on the outer periphery of the right part of the valve sleeve 2, and a lug 202 is provided on the edge of the fixing plate 201, and the valve sleeve 2 fixes the motor cover 41 through the lug 202; an internal thread is provided on the inner cavity wall surface of the right part of the valve sleeve 2, and an external thread is provided on the outer peripheral surface of the left part of the right end cover 21, and the right thread of the valve sleeve 2 is fitted with the right end cover 21.

[0049] Specifically, the left end inner cavity of the valve core 3 is embedded with a valve core left plugging piece 31, and the valve core 3 is a full-bridge type or a half-bridge type. The left and right outer circumferential surfaces of the full-bridge type valve core 3 are respectively provided with concentric rings 32, and the outer circumference of the valve core 3 on the right side of the concentric ring 32 is provided with a right cover plate 33, and the inner cavity wall surface of the left screw plug 1 and the inner cavity wall surface of the right cover plate 33 are both provided with annular grooves, and the annular grooves are equipped with step seals and O-rings, and the O-rings are sleeved on the outer circumference of the step seal; the right outer circumferential surface of the half-bridge type valve core 3 is respectively provided with concentric rings 32, and the outer circumference of the valve core 3 is provided with a right cover plate 33, and the inner cavity wall surface of the right cover plate 33 is provided with annular grooves, and the annular grooves are equipped with step seals and O-rings, and the O-rings are sleeved on the outer circumference of the step seal.

[0050] Specifically, the radial zero adjustment component 6 is matched with the annular sleeve 4301 protruding outwardly in the middle of the right end of the motor outer rotor 43; the left side of the outer rotor 43 is circumferentially evenly distributed with magnetic steel grooves 4302, and the motor outer rotor magnets 44 are matched in the magnetic steel grooves 4302.

[0051] Specifically, the LVDT detection module 5 includes an LVDT sensing core connector 51, an LVDT sensing core 52 and an LVDT body 53. The LVDT sensing core connector 51 is embedded in the right end of the valve core 3. The right end inner cavity of the LVDT sensing core connector 51 is threaded with the LVDT sensing core 52. The LVDT sensing core 52 is embedded in the left inner cavity of the LVDT body 53. The LVDT body 53 is fixed to the right part of the motor cover 41 by bolts.

[0052] Specifically, the radial zero adjustment component 6 includes an angular displacement transmission fork 61, a radial zero adjustment screw 62, and a rotational return spring 63. The angular displacement transmission fork 61 is fixed on an annular sleeve 4301 protruding outside the middle of the right end of the motor outer rotor 43. Blind holes 6101 are provided on both sides of the upper part of the angular displacement transmission fork 61, and a rotational return spring 63 is matched in the blind holes 6101; a radial zero adjustment seat 2102 is provided on the right side surface of the right end cover 21, a radial zero adjustment threaded hole 2103 is longitudinally provided on the radial zero adjustment seat 2102, and the inner thread of the radial zero adjustment threaded hole 2103 is matched with a radial zero adjustment screw 62, and the end of the radial zero adjustment screw 62 is matched with the rotational return spring 63.

[0053] Specifically, the angular displacement detection module 7 includes a ruby ​​ball head 71, a ruby ​​ball head rod 72, a ruby ​​ball head shaft 73, a needle bearing 74, an angular displacement sensor magnet 75, a magnetic steel window end cover 76, and an angular displacement sensor body 77. The right end of the motor cover 41 is fixed with a magnetic steel window end cover 76 and an angular displacement sensor body 77 in sequence by bolts. A needle bearing 74 is transversely fixed inside the right end of the motor cover 41, and a ruby ​​ball head shaft 73 is embedded in the needle bearing 74. The angular displacement sensor magnet 75 is embedded inside the lower right end of the ruby ​​ball head shaft 73, and a ruby ​​ball head rod 72 is transversely embedded in the upper part of the ruby ​​ball head shaft 73. The left end of the ruby ​​ball head rod 72 is fitted with a ruby ​​ball head 71, which is fitted in the notch above the angular displacement transmission fork 61, and the angular displacement transmission fork 61 is fixed to the middle of the right end of the motor outer rotor 43; the right inner cavity of the valve core 3 is embedded with a valve core right blocking member 34.

[0054] Working process of the present invention:

[0055] The threaded plug-in two-dimensional electro-hydraulic proportional valve for the rubber mixing mill pitch adjustment system of the present invention is described in conjunction with the accompanying drawings during its working process.

[0056] The structure of the two-dimensional servo valve has been involved in the previous patents of the present application team. The difference is that the right end of the valve core 3 of the two-dimensional servo valve in the present application is fixedly connected to the motor outer rotor 43 of the motor 4, and the valve core 3 and the motor outer rotor 43 are made into an integrated body, which is equivalent to a two-dimensional rotor. The axial displacement and angular displacement of the valve core 3 are the linear displacement and angular displacement of the motor; the valve body in the present invention can be an integrated valve block with the valve body oil circuit structure in the prior art, and the matching is completed by threaded insertion.

[0057] The valve core 3 in the present invention can be in different forms such as full bridge and half bridge. The linear displacement can be detected by a linear displacement sensor, and the angular displacement can be detected by an angular displacement sensor.

[0058] The valve sleeve 2 is screwed into the matching integrated valve block, and combined with the existing oil path structure in the valve body on the integrated valve block, a complete valve is formed. According to the different forms of the valve core 3 and the different detection methods, the following three situations are described.

[0059] Embodiment 1: Full-bridge-LVDT detection scheme, as shown in the attached Figure 1-13 .

[0060] In this scheme, the torque of the outer rotor motor is relatively large, and it is directly connected to the valve core 3 through the outer rotor 43 of the motor. When the outer rotor 43 of the motor rotates, the valve core 3 rotates. The valve core 3 is designed with high and low pressure holes, which are distributed diagonally. When the pressure changes, it will drive the movement. Concentric rings 32 and step seal + O-ring structures are provided on the left and right sides of the valve core 3 to ensure that the oil does not leak out. The detection of linear displacement is obtained by the linear displacement detection of the LVDT induction core connector 51 connected to the valve core 3. Compared with the angular displacement sensor, the detection has no dead zone and high accuracy. The radial adjustment of the angular displacement transmission fork 61 is completed by radially adjusting the radial zeroing screw 62, thereby realizing the zero position adjustment of the valve core 3. During the movement of the valve core 3, axial movement will occur. In this process, the left and right axial return springs 24 play a buffering role, and the brass sleeve 25 is used to limit the axial return spring 24. The thrust bearing 22 in the structure can solve the friction problem caused by rotation and axial movement.

[0061] Embodiment 2: Half-bridge-LVDT detection scheme, as shown in the attached Figure 14-17 .

[0062] The difference between the half-bridge solution and the full-bridge solution of the first embodiment lies in the left part. In the half-bridge solution, the concentric ring 32 on the left side is removed, and the left screw plug 1 does not need to be equipped with a step seal.

[0063] Embodiment 3: Full-bridge-angular displacement detection scheme, as shown in the attached Figure 18-24 .

[0064] Compared with the linear displacement detection scheme of Example 1, the difference between the angular displacement detection and the linear displacement detection scheme lies in the right part. In the angular displacement detection scheme, the linear displacement detection-related components are no longer provided, but the angular displacement detection-related components are used. The right end of the inner cavity of the valve core 3 needs to be blocked with the valve core right blocking member 34. At the same time, the rotation angle of the valve core 3 is consistent with the rotation of the angular displacement transfer fork 61. The rotation angle of the valve core 3 is transmitted to the ruby ​​ball head 71 through the angular displacement transfer fork 61, and then transmitted to the ruby ​​ball head shaft 73 through the ruby ​​ball head rod 72. The angle sensor magnet 75 magnetically attracted on the ruby ​​ball head shaft 73 rotates, and the angle detected by the angle sensor body 77 is the rotation angle of the valve core 3.

[0065] The ruby ​​ball head 71 is located in the notch above the angular displacement transmission fork 61, and the ruby ​​head is wear-resistant. The axial movement of the valve core 3 will produce dry wear. The ruby ​​ball head 71 is only tested for a moment of inertia, and no torque is transmitted. The entire large torque is transmitted to the valve core 3 through the motor outer rotor 43.

[0066] Ruby has high precision and can be ground. The current scientific research institutes can grind to 2 microns with high precision within one percent. It can be applied to the physical production in this application to extend the service life. Therefore, the structure of this application conforms to the actual situation, can solve the existing technical problems, and improve the detection accuracy.

[0067] The design purpose of the horizontal hole in the middle of the lower part of the ruby ​​ball shaft 73 being coaxial with the hole of the valve core 3 is to ensure the coaxiality of the installation by adding a positioning pin during the installation process. After the ruby ​​ball shaft 73 is fixed, the positioning pin can be removed. The installation positioning is achieved through a positioning pin; after the positioning pin is positioned, it can be installed and locked by bolts, and the positioning pin can be pulled out after locking. The fixing hole under the angular displacement transmission fork 61 is an expansion hole with a large diameter, which can be moderately fine-tuned.

[0068] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention belongs to the protection scope of the present invention.

Claims

1. The threaded plug-in two-dimensional electro-hydraulic proportional valve for the rubber mixing mill pitch adjustment system is characterized by: The valve sleeve (2) comprises a left screw plug (1) threadedly engaged with the inner cavity of the left portion of the valve sleeve (2), a valve core (3) embedded in the inner cavity of the valve sleeve (2), a motor (4) directly connected to the right end of the valve core (3) and mounted on the right end of the valve sleeve (2), a radial zero adjustment component (6) connected to the motor outer rotor (43) of the motor (4), and an LVDT detection module (5) or an angular displacement detection module (7) mounted on the right end of the motor (4); the left portion of the valve sleeve (2) is threadedly engaged with the valve body; The left end of the left screw plug (1) has an internal hexagonal groove, the outer peripheral surface of the left screw plug (1) is provided with an external thread, the wall surface of the left inner cavity of the valve sleeve (2) is provided with an internal thread, and the thread of the left screw plug (1) is matched with the left inner cavity of the valve sleeve (2); The left end inner cavity of the valve core (3) is embedded with a valve core left plugging member (31), and the valve core (3) is a full-bridge type or a half-bridge type. The left and right outer circumferential surfaces of the full-bridge type valve core (3) are respectively provided with concentric rings (32), and the right concentric ring (32) is provided with a right cover plate (33) on the outer circumference of the valve core (3) on the right side. The inner cavity wall surface of the left screw plug (1) and the inner cavity wall surface of the right cover plate (33) are both provided with annular grooves, and the annular grooves are equipped with step seals and O-type sealing rings, and the O-type sealing rings are sleeved on the outer circumference of the step seal. The right outer circumferential surface of the half-bridge type valve core (3) is respectively provided with concentric rings (32), and the outer circumference of the valve core (3) is equipped with a right cover plate (33), and the inner cavity wall surface of the right cover plate (33) is provided with annular grooves, and the annular grooves are equipped with step seals and O-type sealing rings, and the O-type sealing rings are sleeved on the outer circumference of the step seal. The motor (4) comprises a motor cover (41) fixed on the valve sleeve (2), a stator winding (45) embedded in the outer periphery of the right part of the valve sleeve (2), a motor outer rotor magnet (44) sleeved on the outer periphery of the stator winding (45), a motor outer rotor (43) matched with the motor outer rotor magnet (44), and an outer rotor sleeve (42) sleeved on the outer periphery of the motor outer rotor (43) and the outer rotor magnet (44); a radial zero adjustment component (6) is matched on an annular sleeve (4301) protruding outwardly at the middle part of the right end of the motor outer rotor (43); magnetic steel grooves (4302) are evenly distributed on the left side of the outer rotor (43), and the motor outer rotor magnet (44) is matched in the magnetic steel grooves (4302); An external thread is provided on the outer peripheral surface of the middle part of the valve sleeve (2), and the valve sleeve (2) is fitted into the valve body through the external thread; a fixing plate (201) is provided on the outer peripheral surface of the right part of the valve sleeve (2), and a lug (202) is provided on the edge of the fixing plate (201), and the valve sleeve (2) is fixed to the motor cover (41) through the lug (202); an internal thread is provided on the wall surface of the inner cavity of the right part of the valve sleeve (2), and an external thread is provided on the outer peripheral surface of the left part of the right end cover (21), and the right thread of the valve sleeve (2) is fitted with the right end cover (21); The right inner cavity of the valve sleeve (2) is threadedly matched with a right end cover (21), the inner cavity of the right end cover (21) is protruded with an annular limit shoulder (2101), and the limit shoulder (2101) is symmetrically matched with axial return springs (24) on both sides, and the left end of the axial return spring (24) on the left and the right end of the axial return spring (24) on the right are respectively matched with axial spring seats (23), and the left end of the axial spring seat (23) on the left and the right end of the axial spring seat (23) on the right are respectively matched with thrust bearings ( 22), the left side surface of the thrust bearing (22) at the left end abuts against the shoulder on the valve core (3), and the right side surface of the thrust bearing (22) at the right end abuts against the inner bottom surface of the motor outer rotor (43), the thrust bearing (22), the axial spring seat (23), and the axial return spring (24) are all mounted on the outer periphery of the right end of the valve core (3), and a brass sleeve (25) is embedded on the inner wall surface of the right end cover (21) on both sides of the limit shoulder (2101), and the inner wall surface of the brass sleeve (25) matches the outer peripheral surface of the axial spring seat (23); The LVDT detection module (5) comprises an LVDT induction core connector (51), an LVDT induction core (52) and an LVDT body (53); the LVDT induction core connector (51) is embedded in the right end of the valve core (3); the inner cavity of the right end of the LVDT induction core connector (51) is threadedly matched with the LVDT induction core (52); the LVDT induction core (52) is embedded in the left inner cavity of the LVDT body (53); and the LVDT body (53) is fixed to the right part of the motor cover (41) by bolts; The radial zero adjustment component (6) comprises an angular displacement transmission fork (61), a radial zero adjustment screw (62), and a rotational return spring (63); the angular displacement transmission fork (61) is fixed to an annular sleeve (4301) protruding outwardly in the middle of the right end of the motor outer rotor (43); blind holes (6101) are provided on both sides of the upper part of the angular displacement transmission fork (61), and the rotational return spring (63) is matched in the blind holes (6101); a radial zero adjustment seat (2102) is provided on the right side surface of the right end cover (21); a radial zero adjustment threaded hole (2103) is longitudinally provided on the radial zero adjustment seat (2102), and the radial zero adjustment threaded hole (2103) is matched with the radial zero adjustment screw (62) in the inner thread, and the end of the radial zero adjustment screw (62) is matched with the rotational return spring (63); The angular displacement detection module (7) comprises a ruby ​​ball head (71), a ruby ​​ball head rod (72), a ruby ​​ball head shaft (73), a needle roller bearing (74), an angular displacement sensor magnet (75), a magnet window end cover (76), and an angular displacement sensor body (77); the right end of the motor cover (41) is fixed with the magnet window end cover (76) and the angular displacement sensor body (77) in sequence by bolts; the right end of the motor cover (41) is laterally fixed with a needle roller bearing (74), and the needle roller bearing (74) is embedded with a ruby A ball head shaft (73), an angular displacement sensor magnet (75) is embedded inside the right end of the lower part of the ruby ​​ball head shaft (73), a ruby ​​ball head rod (72) is transversely embedded in the upper part of the ruby ​​ball head shaft (73), a ruby ​​ball head (71) is sleeved on the left end of the ruby ​​ball head rod (72), the ruby ​​ball head (71) is matched in the notch above the angular displacement transmission fork (61), and the angular displacement transmission fork (61) is fixed to the middle part of the right end of the motor outer rotor (43); a valve core right blocking member (34) is embedded in the right inner cavity of the valve core (3).

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