A differential accusation sensor

Abstract

The present invention relates to a differential pointing sensor in the field of sensors, and specifically to a differential pointing sensor, comprising a housing, a partition fixedly connected in the housing, a cross hinge device fixedly provided on the partition, the cross hinge device comprising a pull shaft and a cross plate sleeved on the pull shaft, the pull shaft extending from one end of the housing, and a support plate fixedly connected to the other end of the housing; four limiting through holes are evenly distributed along the circumference of the pull shaft on the partition, and four winding skeletons are fixedly connected at positions corresponding to the limiting through holes on the support plate; the present invention has a reasonable structure, high reliability, and high precision, and utilizes primary coils on the same group of winding skeletons wound with the same wire and connected, and secondary coils wound with two wires and differentially connected, so as to analyze the pointing angle and direction. The present invention is a non-contact electromagnetic induction. It has strong anti-electromagnetic interference capability, a wide differential output application temperature range, and small temperature drift.

Description

Technical Field

[0001] The present invention relates to the field of sensors, and in particular to a differential accusation sensor. Background Art

[0002] Existing finger sensors mostly utilize the Hall effect principle. The Hall effect chip circuit is located on the bottom of the sensor, and a magnet is mounted on the end of the trigger lever. The magnet and chip form a three-dimensional sensor, sensing the magnet's position and magnetic field strength. This implementation is susceptible to interference from spatial magnetic fields, resulting in output deviations. Furthermore, temperature drift is significant in high and low temperature environments. Furthermore, deviations in the relative position of the chip and magnet increase the complexity of subsequent debugging. Summary of the Invention

[0003] The purpose of this invention is to provide a high-precision finger-pointing sensor with a reasonable structure and high reliability. This solves the problems of Hall-type finger-pointing displacement sensors, such as susceptibility to spatial magnetic field interference, large temperature drift, and difficult assembly, and achieves precise control of output.

[0004] The present invention provides a differential finger pointing sensor, comprising a cylindrical housing with two open ends, a partition fixedly connected to the housing, a cross hinge device fixedly provided on the partition, the cross hinge device comprising a pull shaft and a cross plate sleeved on the pull shaft, the pull shaft extending from one end of the housing, and a support plate fixedly connected to the other end of the housing;

[0005] The partition plate is provided with four limiting through holes evenly distributed along the circumference of the pull shaft, and four winding skeletons are fixedly connected to the positions of the supporting plate corresponding to the limiting through holes. The end of the winding skeleton away from the supporting plate is connected to a contact rod through a sleeve sleeved on the winding skeleton, and the end of the contact rod away from the sleeve passes through the limiting hole and abuts against the corresponding and fixed contact block on the cross disk;

[0006] A return spring is sleeved on the winding frame between the sleeve and the support plate, one end of the return spring abuts against the sleeve, and the other end abuts against the base fixedly connected to the bottom of the winding frame;

[0007] The winding frame has a coil wound on one end thereof facing the sleeve, and a soft magnetic alloy rod is fixedly arranged in the sleeve, and the soft magnetic alloy rod is arranged in the inner area of ​​the coil on one end thereof facing the coil;

[0008] When the lever is operated, the contact block on the cross disk follows the lever to press the contact rod, changing the length of the soft magnetic alloy rod extending into the coil.

[0009] The coils each include a primary coil and a secondary coil wound outside the primary coil, and two non-adjacent winding bobbins among the four winding bobbins form a group;

[0010] The primary coils on the same set of winding frames are wound with the same wire and connected, and the secondary coils are wound with two wires and the two secondary coils are differentially connected;

[0011] The wiring terminals of the coils are respectively connected to corresponding wiring posts fixedly arranged on the support plate.

[0012] Preferably, the cross hinge device further comprises a bearing base and a pendulum seat, wherein two bearing fixing rings are symmetrically provided on the facing surfaces of the bearing base and the pendulum seat, the central axes of the bearing fixing rings on the bearing base are located on the same straight line, the central axes of the bearing fixing rings on the pendulum seat are located on the same straight line, and the central axes of the bearing fixing rings on the bearing base and the bearing fixing rings on the pendulum seat are both located in the same plane and are perpendicular to each other;

[0013] A cross block is also fixedly provided on the bearing base, and the cross block is located in the area between the two bearing fixing rings on the bearing base, and bearings are provided in the bearing fixing rings on the bearing base;

[0014] The single pendulum seat is buckled on the bearing base, and the two bearing fixing rings on the single pendulum seat are located on both sides of the cross block, and the bearing fixing rings on the single pendulum seat are both provided with bearings;

[0015] The circumferential surface of the cross block facing the bearing is fixedly connected to a bearing inner sleeve, and the bearing inner sleeve is threadedly connected to an inner ring screw, and the bearing inner sleeve and inner ring screw on the same bearing are respectively located on both sides of the bearing, and the bearing inner ring and inner ring screw respectively abut against both sides of the bearing inner ring;

[0016] A bearing outer ring retaining ring is provided on the side of the bearing fixing ring facing the cross block, and outer ring screws are connected to the side of the bearing outer ring away from the cross block. The outer ring screws are respectively fixedly connected to the bearing base or the single pendulum seat where the bearing is located;

[0017] The pull shaft is fixedly arranged on a side of the single pendulum seat away from the bearing fixing ring, and the single pendulum seat is fixedly connected to the cross plate;

[0018] The bearing base is fixedly connected to the partition;

[0019] The contact blocks on the cross plate are arranged corresponding to the bearings.

[0020] Preferably, the end of the pull shaft away from the single pendulum seat passes through the cross plate and is fixedly connected to a cap, a protective cover covering the end of the shell is sleeved between the cap and the cross plate, and the protective cover is fixedly connected to the cross plate.

[0021] Preferably, the protective cover is arc-shaped.

[0022] Preferably, the housing is a stepped housing, and the partition is fixed at the step of the housing by screws.

[0023] Preferably, a ring platform is provided on one end of the shell connecting support plate, the support plate is engaged with the ring platform, and is fixedly connected to the shell through an insulating base fixedly connected to the shell, and the terminal posts all pass through the insulating base and extend out of the shell.

[0024] This invention features a rational structure, high reliability, and high precision. It utilizes a primary coil wound with the same wire on a bobbin, connected to a secondary coil wound with two wires and differentially connected. This allows for accurate measurement of the angle and direction of the pointer's movement. This non-contact electromagnetic induction method offers strong resistance to electromagnetic interference, a wide temperature range for differential output, and minimal temperature drift. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is an exploded view of the present invention.

[0026] Figure 2 This is an exploded view of the cross hinge device.

[0027] Figure 3 A rear cross-sectional view showing the present invention operating the axle and removing the housing.

[0028] Figure 4 Cross-sectional view of the present invention.

[0029] Figure 5 This is the electrical schematic diagram.

[0030] Figure numerals: 1-cap, 2-protective cover, 3-cross plate, 4-housing, 5-partition, 6-sleeve, 7-reset spring, 8-single pendulum seat, 9-terminal, 10-winding frame, 11-coil, 12-support plate, 13-insulating base, 14-cross block, 15-bearing base. DETAILED DESCRIPTION

[0031] The present invention discloses a differential finger pointing sensor, comprising a cylindrical housing 4 with two open ends. A partition plate 5 is fixedly connected to the housing 4. A cross hinge device is fixedly provided on the partition plate 5. The cross hinge device includes a pull shaft and a cross plate 3 sleeved on the pull shaft. The pull shaft extends from one end of the housing 4, and a support plate 12 is fixedly connected to the other end of the housing 4.

[0032] The partition plate 5 is provided with four limiting through holes evenly distributed along the circumference of the pull shaft. Four winding skeletons 10 are fixedly connected to the positions of the supporting plate 12 corresponding to the limiting through holes. The end of the winding skeleton 10 away from the supporting plate 12 is connected to a contact rod through a sleeve 6 sleeved on the winding skeleton 10. The end of the contact rod away from the sleeve 6 passes through the limiting hole and abuts against the corresponding and fixed contact block on the cross plate 3.

[0033] A return spring 7 is sleeved on the winding skeleton 10 between the sleeve 6 and the support plate 12. One end of the return spring 7 abuts against the sleeve 6, and the other end abuts against the base fixedly connected to the bottom of the winding skeleton 10.

[0034] The winding frame 10 is wound with a coil 11 on one end thereof facing the sleeve 6. A soft magnetic alloy rod is fixedly arranged in the sleeve 6, and the end thereof facing the coil 11 is arranged in the inner area of ​​the coil 11.

[0035] When the pull shaft is operated, the contact block on the swash plate 3 presses the contact rod along with the pull shaft, changing the length of the soft magnetic alloy rod extending into the coil 11;

[0036] The coils 11 each include a primary coil and a secondary coil wound outside the primary coil, and two non-adjacent winding skeletons 10 among the four winding skeletons 10 form a group;

[0037] The primary coils on the same group of winding bobbins 10 are wound with the same wire and connected, and the secondary coils are wound with two wires and the two secondary coils are differentially connected;

[0038] The connection terminals of the coil 11 are respectively connected to corresponding connection posts 9 fixedly provided on the support plate 12 .

[0039] The cross hinge device also includes a bearing base 15 and a pendulum seat 8. Two bearing fixing rings are symmetrically provided on the facing surfaces of the bearing base 15 and the pendulum seat 8. The central axes of the bearing fixing rings on the bearing base 15 are located on the same straight line, and the central axes of the bearing fixing rings on the pendulum seat 8 are located on the same straight line. The central axes of the bearing fixing rings on the bearing base 15 and the bearing fixing rings on the pendulum seat 8 are both located in the same plane and are perpendicular to each other.

[0040] A cross block 14 is also fixedly provided on the bearing base 15. The cross block 14 is located in the area between the two bearing fixing rings on the bearing base 15. The bearing fixing rings on the bearing base 15 are both provided with bearings.

[0041] The single pendulum seat 8 is buckled on the bearing base 15, and the two bearing fixing rings on the single pendulum seat 8 are located on both sides of the cross block 14, and the bearing fixing rings on the single pendulum seat 8 are both provided with bearings;

[0042] The circumferential surface of the cross block 14 facing the bearing is fixedly connected to a bearing inner sleeve, and the bearing inner sleeve is threadedly connected to an inner ring screw. The bearing inner sleeve and the inner ring screw on the same bearing are respectively located on both sides of the bearing, and the bearing inner ring and the inner ring screw respectively abut against both sides of the bearing inner ring;

[0043] A bearing outer ring retaining ring is provided on the side of the bearing fixing ring facing the cross block 14, and outer ring screws are connected to the side of the bearing outer ring away from the cross block 14. The outer ring screws are respectively fixedly connected to the bearing base 15 or the single pendulum seat 8 where the bearing is located;

[0044] The pull shaft is fixedly arranged on the side of the single pendulum seat 8 away from the bearing fixing ring, and the single pendulum seat 8 is fixedly connected to the cross plate 3;

[0045] The bearing base 15 is fixedly connected to the partition 5;

[0046] The contact blocks on the cross plate 3 are arranged corresponding to the bearings.

[0047] The end of the pull shaft away from the single pendulum seat 8 passes through the swash plate 3 and is fixedly connected to a cap 1. A protective cover 2 covering the end of the shell 4 is sleeved between the cap 1 and the swash plate 3, and the protective cover 2 is fixedly connected to the swash plate 3.

[0048] The protective cover 2 is arc-shaped.

[0049] The housing 4 is a stepped housing 4 , and the partition 5 is fixed at the step of the housing 4 by screws.

[0050] A ring platform is provided on one end of the shell 4 connected to the support plate 12. The support plate 12 is engaged with the ring platform and is fixedly connected to the shell 4 through an insulating base 13 fixedly connected to the shell 4. The terminal posts 9 all pass through the insulating base 13 and extend out of the shell 4.

[0051] The working principle of the present invention is to convert the operating action of the pull shaft into an electrical signal output through a differential inductance circuit. Figure 4 As shown, when cap 1 is moved, the actuating shaft moves, compressing reset spring 7. The distance between reset spring 7 and coil 11 changes, and the length of the soft magnetic alloy rod extending into coil 11 changes. This changes the magnetic resistance of coil 11, the inductance, and the voltage across the inductance. The electrical signal output changes with the angle of movement, and the output signal changes after the actuating shaft is operated. When cap 1 is further moved, the protective cover limits the angle of movement, releasing cap 1 and releasing the pressure from the compressed spring, tending to return cap 1 to its zero position. At this point, the compression spring and the feeler return to their original positions, and the inductance of coil 11 returns to its zero value. The zero-position voltage is output at this point, and the zero-position signal is output after the thumb self-reset operation is completed.

[0052] The cross hinge device is used to convert angular motion into displacement motion. Within a small angle rotation range, the angular displacement is proportional to the linear displacement.

[0053] The coils 11 are wound on the two groups of winding bobbins 10 to form a differential circuit coil 11 in each of the X and Y directions. The differential circuit in each direction is arranged on two symmetrical winding bobbins 10 .

[0054] Each differential circuit is composed of a primary coil and two sets of secondary coils. The two secondary coils are connected in series in anti-phase with respect to the potential and output in a differential manner. When a certain sinusoidal AC voltage is applied to the primary coil, After that, an induced potential is generated in the secondary coil 、 When the displacement sensor is in the middle position, the mutual inductance of the two secondary coils is the same, and the induced potential = , the output voltage is zero; when the pull shaft is operated, the cap 1 moves from the middle position to one side, the pull side contact rod is compressed by the cross hinge device, the mutual inductance of the coil 11 in the compression direction increases, and the mutual inductance of the coil 11 in the non-compression direction remains unchanged, the induced potential > , output voltage = - It is not zero, and within the range of the present invention, the greater the displacement, the greater the output voltage difference. When the reverse operation pulls the shaft, the mutual inductance of the coil 11 in the compression direction increases, and the mutual inductance of the coil 11 in the non-compression direction remains unchanged, and the induced potential > , output voltage Within the specified range, the ratio of the output voltage difference of the two channels to the sum of the output voltages is in a linear relationship.

[0055] Assembly sequence

[0056] 1. Install the partition 5 into the housing 4 using screws;

[0057] 2. Use screws to fix the assembled cross hinge device into the housing 4 equipped with the partition 5;

[0058] 3. Fix the protective cover 2 to the housing 4 with screws;

[0059] 4. Install the cap 1 onto the pull shaft of the cross hinge device;

[0060] 5. Install the feeler rod and sleeve 6 into the housing 4 from the bottom;

[0061] 6. Fix the winding frame 10 with the coil 11 on the support plate 12, and the support plate 12 is fixed on the insulating base 13. The coil 11 is welded to the terminal 9 according to the principle wiring diagram to output the signal.

[0062] 7. Install the compression spring into the housing 4, and then install the assembly consisting of the winding skeleton 10, the support plate 12, and the terminal 9 into the housing 4 and fix it.

Claims

1. A differential accusation sensor, comprising a cylindrical shell (4) with openings at both ends, wherein a partition (5) is fixedly connected to the shell (4), characterized in that: A cross hinge device is fixedly provided on the partition (5), and the cross hinge device includes a pull shaft and a cross plate (3) sleeved on the pull shaft, the pull shaft extends from one end of the shell (4), and a support plate (12) is fixedly connected to the other end of the shell (4); The partition plate (5) is provided with four limiting through holes evenly distributed along the circumference of the pull shaft, and four winding skeletons (10) are fixedly connected to the positions of the corresponding limiting through holes on the support plate (12), and the end of the winding skeleton (10) away from the support plate (12) is connected to a contact rod through a sleeve (6) sleeved on the winding skeleton (10), and the end of the contact rod away from the sleeve (6) passes through the limiting hole and abuts against the corresponding and fixed contact block on the cross plate (3); A return spring (7) is sleeved on the winding frame (10) between the sleeve (6) and the support plate (12), one end of the return spring (7) abuts against the sleeve (6), and the other end abuts against a base fixedly connected to the bottom of the winding frame (10); A coil (11) is wound on one end of the winding frame (10) facing the sleeve (6), a soft magnetic alloy rod is fixedly arranged in the sleeve (6), and one end of the soft magnetic alloy rod facing the coil (11) is arranged in the inner area of ​​the coil (11); When the pull shaft is operated, the contact block on the cross disk (3) presses the contact rod along with the pull shaft, thereby changing the length of the soft magnetic alloy rod extending into the coil (11); The coils (11) each include a primary coil and a secondary coil wound outside the primary coil, and two non-adjacent winding skeletons (10) among the four winding skeletons (10) form a group; The primary coils on the same group of winding frames (10) are wound by the same wire and connected to each other, and the secondary coils are wound by two wires and the two secondary coils are differentially connected; The wiring terminals of the coil (11) are respectively connected to corresponding wiring posts (9) fixedly arranged on the support plate (12); The cross hinge device also includes a bearing base (15) and a single pendulum seat (8), wherein two bearing fixing rings are symmetrically arranged on the opposite sides of the bearing base (15) and the single pendulum seat (8), the central axes of the bearing fixing rings on the bearing base (15) are located on the same straight line, the central axes of the bearing fixing rings on the single pendulum seat (8) are located on the same straight line, and the central axes of the bearing fixing rings on the bearing base (15) and the central axes of the bearing fixing rings on the single pendulum seat (8) are both located in the same plane and are perpendicular to each other.

2. A differential accusation sensor as claimed in claim 1, characterized in that: A cross block (14) is also fixedly provided on the bearing base (15), and the cross block (14) is located in the area between two bearing fixing rings on the bearing base (15), and bearings are provided in the bearing fixing rings on the bearing base (15); The single pendulum seat (8) is buckled on the bearing base (15), and the two bearing fixing rings on the single pendulum seat (8) are located on both sides of the cross block (14), and bearings are provided in the bearing fixing rings on the single pendulum seat (8); The cross block (14) is fixedly connected to the peripheral surface of the bearing with a bearing inner sleeve, and the bearing inner sleeve is threadedly connected with an inner ring screw, and the bearing inner sleeve and the inner ring screw on the same bearing are respectively located on both sides of the bearing, and the bearing inner ring and the inner ring screw are respectively against the two sides of the bearing inner ring; A bearing outer ring retaining ring is provided on the side of the bearing fixing ring facing the cross block (14), and outer ring screws are connected to the side of the bearing outer ring away from the cross block (14), and the outer ring screws are fixedly connected to the bearing base (15) or the single pendulum seat (8) where the bearing is located; The pull shaft is fixedly arranged on a surface of the single pendulum seat (8) away from the bearing fixing ring, and the single pendulum seat (8) is fixedly connected to the cross plate (3); The bearing base (15) is fixedly connected to the partition (5); The contact blocks on the cross plate (3) are arranged corresponding to the bearings.

3. A differential accusation sensor as claimed in claim 2, characterized in that: The end of the pull shaft away from the single pendulum seat (8) passes through the cross plate (3) and is fixedly connected to a cap (1). A protective cover (2) covering the end of the shell (4) is sleeved between the cap (1) and the cross plate (3). The protective cover (2) is fixedly connected to the cross plate (3).

4. A differential accusation sensor as claimed in claim 3, characterized in that: The protective cover (2) is arc-shaped.

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