Torque motor

Abstract

The invention relates to the technical field of hydraulic valve control, in particular to a torque motor which comprises a base, a rotating shaft is arranged in the middle of the base, a holder coaxial with the rotating shaft is arranged on the upper portion of the base, a driving module used for driving the rotating shaft to work is arranged in the holder, and the driving module comprises an armature connected with the rotating shaft. Coils are arranged on the two sides of the armature, pole shoes are arranged on the two sides of the coils, a permanent magnet located on the outer sides of the coils is arranged between the two pole shoes, a flat spring connected with the base is arranged below the armature, the magnetic field intensity between the two pole shoes is changed by electrifying the coils to be rebalanced with the flat spring, and rotation of the armature is achieved. The method has the advantages of high control precision and simple operation.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic valve control, and in particular to a torque motor. Background Art

[0002] As a precise electro-mechanical converter, torque motors are widely used in various occasions that require precise torque control. Its working principle is based on the principle of electromagnetism. The magnetic field strength between the two pole shoes is changed by energizing the coil, and then the armature is re-balanced with the leaf spring to achieve rotation of the armature. This technology not only has the characteristics of high control accuracy, but also is easy to operate, providing efficient and reliable solutions for many industrial fields.

[0003] The core components of the torque motor include permanent magnets, magnetizers, armatures, coils, and internally suspended leaf springs. The permanent magnets magnetize the upper and lower magnetizers into N poles and S poles to form a fixed magnetic field. The armature is connected to the leaf spring and supported by a support structure fixed to the valve seat, located between the upper and lower magnetizers. When no current passes through the coil, the torque motor is in the initial state, and the armature and leaf spring remain balanced.

[0004] When current flows through the coil, the armature is magnetized. According to the principle that like repels like and opposites attract, the armature is deflected by the magnetic field force. At this time, the leaf spring bends and deforms, generating a corresponding counter torque to try to restore the armature to its initial position. As the current changes, the magnetic field strength also changes, and the balance between the armature and the leaf spring is broken and re-established, thereby achieving the rotation of the armature.

[0005] The torque motor receives the electric control signal and generates torque rotation in the hydraulic valve. It works by controlling the balance between the magnetic field force and the spring force. The torque motor controls the movement position of the shaft on the hydraulic valve by the balance between the spring force and the magnetic field force. Traditional hydraulic valves are mainly controlled by electromagnets, with low utilization of the magnetic field, low magnetic force, and a small output torque range. Summary of the invention

[0006] In order to solve the above problems, an embodiment of the present invention provides a torque motor, which changes the magnetic field strength between the two pole shoes and rebalances the leaf spring by energizing the coil to achieve rotation of the armature, and has the advantages of high control accuracy and simple operation.

[0007] In order to achieve the above-mentioned purpose, the embodiment of the present invention specifically adopts the following technical scheme: a torque motor includes a base, a rotating shaft is arranged in the middle of the base, a retaining frame coaxially distributed with the rotating shaft is arranged on the upper part of the base, a driving module for driving the rotating shaft to operate is arranged in the retaining frame, the driving module includes an armature connected to the rotating shaft, coils are arranged on both sides of the armature, pole shoes are arranged on both sides of the coil, a permanent magnet located on the outside of the coil is arranged between the two pole shoes, and a leaf spring connected to the base is arranged below the armature.

[0008] As a further improvement of the above technical solution:

[0009] The rotating shaft and the armature are detachably connected via a fastening screw.

[0010] A plug-in hole for installing a rotating shaft is arranged in the middle of the armature, and a threaded hole for installing a fastening screw is arranged on the side wall of the plug-in hole.

[0011] The leaf spring comprises a base, a middle portion of the base is provided with an avoidance hole corresponding to the position of the rotating shaft, two ends of the base are provided with first connecting holes, two sides of the base are provided with second connecting holes, and a connecting portion is provided between the avoidance hole and the first connecting hole.

[0012] The base is provided with a groove corresponding to the position of the first connecting hole, and a positioning pin 1 used in conjunction with the first connecting hole is provided in the groove.

[0013] A connecting column corresponding to the position of the second connecting hole is arranged at the lower part of the armature, a clamping boss is arranged on the side wall of the connecting column, and a second positioning pin is arranged at the end of the connecting column.

[0014] The connecting portion is of hollow design.

[0015] A support body for mounting a retaining frame is arranged on the base, and positioning bolts detachably connected to the support body are arranged around the retaining frame.

[0016] The beneficial effects of the embodiments of the present invention are as follows: the torque motor comprises a base, a rotating shaft is arranged in the middle of the base, a retaining frame coaxially distributed with the rotating shaft is arranged on the upper part of the base, a driving module for driving the rotating shaft to operate is arranged in the retaining frame, the driving module comprises an armature connected to the rotating shaft, coils are arranged on both sides of the armature, pole shoes are arranged on both sides of the coil, a permanent magnet located outside the coil is arranged between the two pole shoes, a leaf spring connected to the base is arranged below the armature, the magnetic field strength between the two pole shoes is changed by energizing the coil to rebalance with the leaf spring, thereby realizing the rotation of the armature, which has the advantages of high control accuracy and simple operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 It is a top view of the present invention (the retainer is omitted);

[0019] Figure 3 for Figure 2 Section along AA;

[0020] Figure 4 It is a structural schematic diagram of the base in the present invention;

[0021] Figure 5 The schematic diagram of the structure of the armature in the present invention is

[0022] Figure 6 It is a structural schematic diagram of the driving module in the present invention;

[0023] Figure 7 It is a schematic diagram of the structure of the leaf spring in the present invention.

[0024] In the figure: 1. base; 2. rotating shaft; 3. retaining frame; 4. permanent magnet; 5. armature; 6. coil; 7. pole shoe; 8. leaf spring; 9. plug-in hole; 10. threaded hole; 11. base; 12. avoidance hole; 13. first connecting hole; 14. second connecting hole; 15. connecting part; 16. groove; 17. locating pin 1; 18. connecting column; 19. connecting boss; 20. supporting body; 21. locating bolt; 22. fastening screw; 23. locating pin 2. DETAILED DESCRIPTION

[0025] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0026] like Figure 1-7 As shown, the torque motor of this embodiment includes a base 1, a rotating shaft 2 is arranged in the middle of the base 1, a retaining frame 3 coaxially distributed with the rotating shaft 2 is arranged on the upper part of the base 1, a driving module for driving the rotating shaft 2 to operate is arranged in the retaining frame 3, and the driving module includes an armature 5 connected to the rotating shaft 2, coils 6 are arranged on both sides of the armature 5, pole shoes 7 are arranged on both sides of the coil 6, a permanent magnet 4 located on the outside of the coil 6 is arranged between the two pole shoes 7, and a leaf spring 8 connected to the base 1 is arranged below the armature 5, and the magnetic field distribution between the two pole shoes 7 is adjusted by the leaf spring 8 to control the rotation stroke and improve the control accuracy.

[0027] The rotating shaft 2 and the armature 5 are detachably connected via a fastening screw 22 .

[0028] The middle part of the armature 5 is provided with an inserting hole 9 for mounting the rotating shaft 2 , and the side wall of the inserting hole 9 is provided with a threaded hole 10 for mounting a fastening screw 22 .

[0029] The leaf spring 8 includes a base 11, a avoidance hole 12 corresponding to the position of the rotating shaft 2 is arranged in the middle of the base 11, first connecting holes 13 are arranged at both ends of the base 11, second connecting holes 14 are arranged on both sides of the base 11, and a connecting part 15 is arranged between the avoidance hole 12 and the first connecting hole 13, which has the advantages of high position repeatability and fast rebound reaction.

[0030] The base 1 is provided with a groove 16 corresponding to the position of the first connecting hole 13 , and a positioning pin 17 used in conjunction with the first connecting hole 13 is provided in the groove 16 .

[0031] A connecting column 18 corresponding to the position of the second connecting hole 14 is provided at the lower part of the armature 5 , a clamping boss 19 is provided on the side wall of the connecting column 18 , and a second positioning pin 23 is provided at the end of the connecting column 18 .

[0032] The connecting portion 15 is of hollow design. The hollow design of the connecting portion 15 can make the armature 5 drive the two-dimensional piston to rotate with a larger rotation angle, and at the same time make the armature 5 have a larger displacement when moving up and down.

[0033] A support body 20 for mounting the retaining frame 3 is disposed on the base 1. Positioning bolts 21 detachably connected to the support body 20 are disposed around the retaining frame 3. The support body 20 is columnar, and the upper end surface is located above the driving module.

[0034] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0035] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] The term "comprise" or any other similar term is intended to cover a non-exclusive inclusion, such that a process, article, or apparatus / device that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, article, or apparatus / device.

[0037] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A torque motor, characterized in that: The invention comprises a base (1), a rotating shaft (2) is arranged in the middle of the base (1), a retaining frame (3) coaxially distributed with the rotating shaft (2) is arranged on the upper part of the base (1), and a driving module for driving the rotating shaft (2) to operate is arranged in the retaining frame (3); The drive module comprises an armature (5) connected to a rotating shaft (2), coils (6) are arranged on both sides of the armature (5), pole shoes (7) are arranged on both sides of the coil (6), a permanent magnet (4) located outside the coil (6) is arranged between the two pole shoes (7), and a leaf spring (8) connected to a base (1) is arranged below the armature (5).

2. The torque motor according to claim 1, characterized in that: The rotating shaft (2) and the armature (5) are detachably connected via a fastening screw (22).

3. The torque motor according to claim 2, characterized in that: A plug-in hole (9) for mounting the rotating shaft (2) is provided in the middle of the armature (5), and a threaded hole (10) for mounting a fastening screw (22) is provided on the side wall of the plug-in hole (9).

4. The torque motor according to claim 1, characterized in that: The leaf spring (8) comprises a base (11), a middle portion of the base (11) is provided with a position-avoiding hole (12) corresponding to the position of the rotating shaft (2), both ends of the base (11) are provided with first connecting holes (13), both sides of the base (11) are provided with second connecting holes (14), and a connecting portion (15) is provided between the position-avoiding hole (12) and the first connecting hole (13).

5. The torque motor according to claim 4, characterized in that: The base (1) is provided with a groove (16) corresponding to the position of the first connecting hole (13), and a positioning pin (17) for use with the first connecting hole (13) is provided in the groove (16).

6. The torque motor according to claim 4, characterized in that: A connecting column (18) corresponding to the position of the second connecting hole (14) is arranged at the lower part of the armature (5), a clamping boss (19) is arranged on the side wall of the connecting column (18), and a second positioning pin (23) is arranged at the end of the connecting column (18).

7. The torque motor according to claim 4, characterized in that: The connecting portion (15) is of hollow design.

8. The torque motor according to claim 1, characterized in that: A support body (20) for mounting a retaining frame (3) is arranged on the base (1), and positioning bolts (21) detachably connected to the support body (20) are arranged around the retaining frame (3).

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