An angle measuring device for multi-metal using eddy current effect

Abstract

The invention discloses an angle measuring device for multiple metals utilizing eddy current effect, and relates to the technical field of metal measuring sensors. The measuring device comprises a detection platform, a measuring motor is arranged on the detection platform, a support platform is rotatably connected to the detection platform, an arc track is arranged on the support platform, teeth are arranged on the arc track, an adaptable motor is arranged on the detection platform, an adjustment gear is arranged on the output end of the adaptable motor, the adjustment gear meshes with the teeth on the arc track, a transmission rod is arranged on the output end of the measuring motor, a detection coil is arranged on the transmission rod, an excitation coil and a receiving coil are arranged on the detection coil, an ASIC circuit board is arranged on the detection coil, a constant temperature cover is arranged on the support platform, a discharge chute is arranged in the constant temperature cover, and a slide rack is arranged on the discharge chute. The invention has the function of high-precision detection of angles of multiple types of metals.

Description

Technical Field

[0001] The invention relates to the technical field of metal measurement sensors, in particular to an angle measurement device for multiple metals using eddy current effect. Background Art

[0002] In some high-precision industries, eddy current sensor is a common sensor, which is usually a non-contact measurement sensor, working according to Faraday's law of electromagnetic induction. It is suitable for the measurement and detection of various materials. The eddy current sensor uses the principle that the eddy current in the measured object generates an induced electromagnetic field for measurement. When the current in the excitation coil is passed, an alternating magnetic field is generated, causing eddy currents in the measured object, so the position information of the metal target can be obtained. At the same time, the eddy current sensor can also be used to detect defects, cracks, deformation and other adverse conditions on the surface of metal materials.

[0003] The eddy current sensor will also encounter many problems when working. Usually, the component of the eddy current sensor that generates the magnetic field is a circuit board structure. Therefore, the component to be detected needs to be a relatively flat metal target. However, when detecting some uneven metal targets, it is necessary to always pay attention to its safety and not to cause damage to the circuit board. During the detection process, the external temperature changes will also cause a large deviation in the generated induced voltage. Different heat has different effects on metal targets of different thicknesses and angles, which will cause large errors in the measuring device. Summary of the invention

[0004] The object of the present invention is to provide an angle measurement device for multiple metals using eddy current effect, so as to solve the problems raised in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] The measuring device includes a testing platform, a measuring motor is arranged on the testing platform, a supporting platform is rotatably connected to the testing platform, an arc track is arranged on the supporting platform, teeth are arranged on the arc track, an adapting motor is arranged on the testing platform, an adjusting gear is arranged on the output end of the adapting motor, the adjusting gear is meshed with the teeth on the arc track, a transmission rod is arranged on the output end of the measuring motor, a detection coil is arranged on the transmission rod, an excitation coil and a receiving coil are arranged on the detection coil, an ASIC circuit board is arranged on the detection coil, a constant temperature cover is arranged on the supporting platform, a discharge chute is arranged in the constant temperature cover, and a sliding rack is arranged on the discharge chute. When performing the inspection, the metal plate is first fed into the heat preservation cover, and then the measuring motor is started. The measuring motor drives the transmission rod to rotate, and the angle between the supporting platform and the testing platform can also be adjusted to adapt to various slopes and various thicknesses. The metal plate can adjust the angle between the support table and the detection table by adapting to the movement of the motor on the arc track, and the ASIC circuit board inputs a high-frequency AC signal to the excitation coil, thereby generating an alternating magnetic field. The magnetic field induces voltage in the detection coil. In the absence of a metal target, due to the anti-serial connection and balance between the line segments, zero output is achieved on each pair of ports after compensation for the induced voltage. When the metal target is placed above the coil, the magnetic field induces eddy currents on the surface of the metal target, and the eddy currents generate anti-magnetic fields, thereby reducing the total magnetic flux density below and reducing the induced voltage in the receiver coil area below the target, thereby generating unbalanced voltages Vsin and Vcos in the anti-serial coil. The amplitude and polarity of the output voltage signal change with the target position, so the position information of the metal target, arctan (Vsin / Vcos), can be obtained.

[0007] A feed port and a discharge port are provided on the constant temperature cover, a slide frame is provided between the feed port and the discharge port, the slide frame includes a lifting slot, a plurality of lifting wheels are rotatably connected to the lifting slot, a turning folding frame is provided on the lifting slot, the turning folding frame is slidably connected to the lifting slot, a discharge cylinder is provided on the turning folding frame, a pushing splint is provided on the output end of the discharge cylinder, the pushing splint is slidably connected to the turning folding frame, the metal target is sent into the constant temperature cover from the feed port, the lifting slot supports the metal target, the lifting wheels on the lifting slot can ensure the stable entry of the metal target, the discharge cylinder drives the turning folding frame to move, so that the metal target can be fully stabilized during the movement, and the discharge cylinder can move in the thermal insulation cover, while the pushing splint drives the metal target, it also drives the turning folding frame to move, thereby ensuring the movement of the metal target.

[0008] A thermal insulation interlayer is arranged in the constant temperature cover, a temperature sensing frame is arranged in the constant temperature cover, a plurality of temperature sensing resistors are evenly arranged on the temperature sensing frame, each temperature sensing resistor is electrically connected to the discharge cylinder through a wire, a following frame is arranged on the temperature sensing frame, and the following frame is slidably connected to the lifting slot. During the detection process, the temperature of the metal target will affect the speed of forming current eddy currents, which is related to the material properties of the metal target itself. In order to ensure that the temperature of each position will not be too different during the metal target detection, the temperature sensing resistor will sense the temperature of the metal target and transmit the resistance change to the discharge cylinder. The discharge cylinder can control the moving speed of the discharge cylinder according to the resistance change, thereby making the voltage change information at the detection point more stable and reducing the measurement error.

[0009] A contact assembly is provided on the transmission rod, and the contact assembly includes a contact tube. The contact tube is slidably connected to the transmission rod, and a sliding spring is provided in the contact tube. Both ends of the sliding spring are respectively against the transmission rod and the contact tube. A plurality of sliding beads are provided on the contact tube, and each sliding bead is rotatably connected to the bottom end of the contact tube. During detection, in order to ensure the distance between the detection coil and the metal plate, the contact tube will be against the metal plate, and the sliding beads can achieve a smooth lubrication effect, while the sliding spring can be responsible for pulling the contact tube to ensure that the contact tube does not damage the metal target.

[0010] The contact tube includes multiple contact strips, each of which is provided with a mosaic tube and a sliding groove, each mosaic tube is embedded in the corresponding sliding groove and is slidably connected with the sliding groove, an anti-collision wedge groove is provided at the bottom of each contact strip, each contact strip is provided with a trigger tooth, a trigger circuit board is provided on the transmission rod, and trigger switches are evenly provided on the trigger circuit board. During the removal process, the contact strip will slide on the transmission rod, thereby driving the trigger teeth on the trigger strip to move synchronously. When the metal target fluctuates greatly, the trigger teeth will contact the trigger switch on the trigger circuit board, thereby transmitting a fluctuation signal and making timely adjustments.

[0011] A deflection motor is arranged on the support platform, a deflection wedge wheel is arranged on the output end of the deflection motor, the deflection wedge wheel is against the mounting ring, the measuring motor is arranged on the mounting ring, the mounting ring is slidably connected to the support platform, a swing spring is arranged between the mounting ring and the support platform, a signal processor is arranged on the energized end of the deflection motor, the signal processor is electrically connected to the trigger circuit board through a wire, the fluctuation signal is transmitted to the signal processor, the trigger switches at different positions will represent different positions and fluctuations of different degrees, after the signal processor comprehensively processes the signal, it will control the deflection motor to rotate, the deflection motor drives the deflection wedge wheel to rotate, the deflection wedge wheel will push away the mounting ring, so that the angle of the measuring motor changes, thereby avoiding excessive fluctuations that affect the measuring motor and increasing the safety of the product.

[0012] The excitation coil is set on the top layer of the detection coil, and the receiving coil includes a Sin coil and a Cos coil. The Sin coil and the Cos coil are alternately and symmetrically distributed on the top layer and the bottom layer of the detection coil. A small cylindrical coil is set on the bottom layer of the detection coil, and the small cylindrical coil is directly below the excitation coil. The receiving coil is divided into a Sin phase and a Cos phase, and each phase has 2 turns. The two ends of the Sin coil, one head is Sin+ and the other head is Sin-. The potential difference between the two is the voltage value Vsin of the Sin signal. There are two circles in one turn of Sin, one circle is Sin+ and the other circle is Sin-, that is, at the commutation point, and the same is true for Cos. Therefore, if the two paths are set symmetrically, in the absence of a metal rotor, the electromotive force generated by a circle of Sin+ and a circle of Sin- cancel each other out, and the output is 0 voltage. In the case of a metal rotor, the signals generated by the two paths are also symmetrical, and the output voltage amplitude is uniform. The setting of the small cylindrical coil is to enhance the magnetic field acceptance ability, because the closer to the coil, the stronger the magnetic field.

[0013] A rotor is provided on the transmission rod, and the center of the rotor coincides with the center of the receiving coil. The rotor is assembled directly above the top layer of the receiving coil with an air gap of 1 mm. The rotor is parallel to the top layer of the receiving coil. The air gap is the most important factor affecting the magnetic field coupling strength between the rotor and the excitation coil, and between the rotor and the receiving coil.

[0014] The detection coil is a PCB circuit board structure, and the ASIC circuit board provides a 2MHZ-5MHZ signal for the excitation coil. The receiving coil is set to 360° as a whole. The receiving coil is alternately and symmetrically distributed on the top and bottom layers of the detection coil. The receiving coil is located inside the excitation coil. The receiving coil is set with multiple commutation points on the top and bottom layers respectively. The existence of the commutation points is to ensure that the coil can have two different routing directions in the same phase, that is, to ensure the existence of Sin+ and Sin-. The excitation coil line width is 0.1-0.5mm, and the line spacing of the excitation coil is 0.5mm. The vias are not placed randomly, but are placed according to the circular ring rule, so that the current density flowing through is uniform. The number of turns of the excitation coil is set according to the shape of the rotor and the electromagnetic characteristics that affect each other. This board has 4 turns. The closer to the coil, the stronger the magnetic field. The excitation coil is set on the top layer close to the rotor to make the magnetic field coupled to the rotor stronger, thereby generating a stronger reverse magnetic field for the receiving coil to decouple.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention adopts a heat preservation cover with a constant temperature protection monitoring function, which can perform constant temperature treatment on the metal to be detected, ensure the stability of the metal target, so that the resistance value of the metal target will not change during the measurement process, and the measurement result will be more accurate. At the same time, the automatic feeding method can also reduce the interference of external feeding on the measurement result.

[0017] 2. The present invention adopts a symmetrical coil distribution and adds a small cylindrical coil, which solves the problem of low accuracy caused by inconsistent amplitudes. At the same time, due to the enhanced coupling ability of the magnetic field, the sensitivity of the eddy current angle sensor is improved.

[0018] 3. The present invention adopts a structural component of metal target self-detection and automatic correction, which can avoid detection of metal targets and correct the measuring motor in time to prevent collision problems. At the same time, the correction compensation parameters can be used in conjunction with the measured angle information to obtain specific parameters of some large-angle metal targets. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the internal structure of the heat preservation cover of the present invention;

[0021] Figure 3 It is a schematic diagram of the lifting tank structure of the present invention;

[0022] Figure 4 It is a schematic diagram of a partial cross-sectional structure of a contact assembly of the present invention;

[0023] Figure 5 It is a schematic diagram of the structure of the detection platform of the present invention;

[0024] Figure 6 It is a schematic diagram of the structure of the excitation coil of the present invention;

[0025] Figure 7 It is a structural schematic diagram of the detection process of the present invention;

[0026] Figure 8 It is a schematic diagram of the working principle structure of the present invention.

[0027] In the figure: 1. test table; 2. measuring motor; 3. support table; 4. arc track; 5. adapting motor; 6. adjusting gear; 7. transmission rod; 8. detection coil; 9. exciting coil; 901. Sin coil; 902. Cos coil; 903. small cylindrical coil; 904. rotor; 10. receiving coil; 11. ASIC circuit board; 12. constant temperature cover; 1201. feeding port; 1202. discharging port; 1204. lifting slot; 1205. lifting wheel; 1206. turning frame; 1207. discharging cylinder; 1208. pushing clamp Plate; 1209, thermal insulation interlayer; 1210, temperature sensing frame; 1211, temperature sensing resistor; 1212, follower frame; 13, discharge chute; 14, slide frame; 15, contact assembly; 1501, contact tube; 1502, sliding spring; 1503, sliding bead; 1504, contact strip; 1505, anti-collision wedge groove; 1506, trigger tooth; 1507, trigger circuit board; 1508, trigger switch; 1509, deflection motor; 1510, deflection wedge wheel; 1511, mounting ring; 1513, swing spring; 1514, signal processor. DETAILED DESCRIPTION

[0028] 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.

[0029] Example: Figure 1-Figure 8As shown, the present invention provides a technical solution. The measuring device includes a detection platform 1, a measuring motor 2 is arranged on the detection platform 1, a support platform 3 is rotatably connected to the detection platform 1, an arc track 4 is arranged on the support platform 3, and teeth are arranged on the arc track 4. An adaptive motor 5 is arranged on the detection platform 1, and an adjustment gear 6 is arranged on the output end of the adaptive motor 5. The adjustment gear 6 is meshed with the teeth on the arc track 4. A transmission rod 7 is arranged on the output end of the measuring motor 2, a detection coil 8 is arranged on the transmission rod 7, an excitation coil 9 and a receiving coil 10 are arranged on the detection coil 8, an ASIC circuit board 11 is arranged on the detection coil 8, a constant temperature cover 12 is arranged on the support platform 3, a discharge chute 13 is arranged in the constant temperature cover 12, and a slide rack 14 is arranged on the discharge chute 13. When performing detection, the metal plate is first fed into the heat preservation cover, and then the measuring motor 2 is started. The measuring motor 2 drives the transmission rod 7 to rotate, and the support platform 3 and the detection can also be adjusted at the same time. The angle between the support platform 3 and the detection platform 1 can be adapted to various slopes and metal plates of various thicknesses. By adapting the movement of the motor 5 on the arc track 4, the angle between the support platform 3 and the detection platform 1 can be adjusted, and the ASIC circuit inputs a high-frequency AC signal to the excitation coil 9, thereby generating an alternating magnetic field. The magnetic field induces a voltage in the detection coil 8. In the absence of a metal target, due to the anti-serial connection and balance between the line segments, zero output is achieved on each pair of ports after compensation for the induced voltage. When the metal target is placed above the coil, the magnetic field induces eddy currents on the surface of the metal target material, and the eddy currents generate an anti-magnetic field, thereby reducing the total magnetic flux density below and reducing the induced voltage in the receiver coil area below the target, thereby generating unbalanced voltages Vsin and Vcos in the anti-serial coil. The amplitude and polarity of the output voltage signal change with the target position, so the position information of the metal target, arctan (Vsin / Vcos), can be obtained.

[0030] The constant temperature cover 12 is provided with a feed port 1201 and a discharge port 1202, a slide frame 14 is provided between the feed port 1201 and the discharge port 1202, the slide frame 14 includes a lifting slot 1204, a plurality of lifting wheels 1205 are rotatably connected to the lifting slot 1204, a turning folding frame 1206 is provided on the lifting slot 1204, the turning folding frame 1206 is slidably connected to the lifting slot 1204, a discharge cylinder 1207 is provided on the turning folding frame 1206, and a pushing splint 1208 is provided on the output end of the discharge cylinder 1207, and the pushing splint 1208 and the turning folding frame 1206 are connected to the turning folding frame 1206. The frame 1206 is slidably connected to feed the metal target from the feed port 1201 into the constant temperature cover 12, the lifting groove 1204 supports the metal target, and the lifting wheel 1205 on the lifting groove 1204 can ensure the stable entry of the metal target. The discharge cylinder 1207 drives the turning and folding frame 1206 to move, so that the metal target can be fully stabilized during the movement, and the discharge cylinder can move in the heat preservation cover, pushing the splint 1208 to drive the metal target while also driving the turning and folding frame 1206 to move, thereby ensuring the movement of the metal target.

[0031] A thermal insulation interlayer 1209 is provided in the constant temperature cover 12, and a temperature sensing frame 1210 is provided in the constant temperature cover 12. A plurality of temperature sensing resistors 1211 are evenly provided on the temperature sensing frame 1210. Each temperature sensing resistor 1211 is electrically connected to the discharge cylinder 1207 through a wire. A following frame 1212 is provided on the temperature sensing frame 1210. The following frame 1212 is slidably connected to the lifting slot 1204. During the detection process, the temperature of the metal target will affect the speed of forming the current eddy current, which is related to the material properties of the metal target itself. In order to ensure that the temperature of each position will not be too different during the metal target detection, the temperature sensing resistor 1211 will sense the temperature of the metal target and transmit the resistance change to the discharge cylinder 1207. The discharge cylinder 1207 can control the moving speed of the discharge cylinder 1207 according to the resistance change, thereby making the voltage change information at the detection point more stable and reducing the measurement error.

[0032] A contact assembly 15 is provided on the transmission rod 7, and the contact assembly 15 includes a contact tube 1501. The contact tube 1501 is slidably connected to the transmission rod 7. A sliding spring 1502 is provided in the contact tube 1501. The two ends of the sliding spring 1502 are respectively against the transmission rod 7 and the contact tube 1501. A plurality of sliding beads 1503 are provided on the contact tube 1501. Each sliding bead 1503 is rotatably connected to the bottom end of the contact tube 1501. When performing detection, in order to ensure the distance between the detection coil 8 and the metal plate, the contact tube 1501 will be against the metal plate, and the sliding bead 1503 can obtain a lubricated and smooth effect, while the sliding spring 1502 can be responsible for pulling the contact tube 1501 to ensure that the contact tube 1501 does not damage the metal target.

[0033] The contact tube 1501 includes a plurality of contact strips 1504, each of which is provided with an interlocking tube and a sliding groove, each of which is embedded in the corresponding sliding groove and is slidably connected with the sliding groove, and an anti-collision wedge groove 1505 is provided at the bottom of each contact strip 1504, and a trigger tooth 1506 is provided on each contact strip 1504. A trigger circuit board 1507 is provided on the transmission rod 7, and trigger switches 1508 are evenly provided on the trigger circuit board 1507. During the removal process, the contact strip 1504 will slide on the transmission rod 7, thereby driving the trigger teeth 1506 on the trigger strip to move synchronously. When the metal target fluctuates greatly, the trigger teeth 1506 will contact the trigger switch 1508 on the trigger circuit board 1507, thereby transmitting a fluctuation signal and making timely adjustments.

[0034] A deflection motor 1509 is provided on the support platform 3, a deflection wedge wheel 1510 is provided on the output end of the deflection motor 1509, the deflection wedge wheel 1510 is against the mounting ring 1511, the measuring motor 2 is provided on the mounting ring 1511, the mounting ring 1511 is slidably connected to the support platform 3, a swing spring 1513 is provided between the mounting ring 1511 and the support platform 3, a signal processor 1514 is provided on the power-on end of the deflection motor 1509, and the signal processor 1514 is electrically connected to the trigger circuit board 1507 through a wire. Then, the fluctuation signal is transmitted to the signal processor 1514. The trigger switches 1508 at different positions will represent different positions and different degrees of fluctuations. After the signal processor 1514 comprehensively processes the signal, it will control the deflection motor 1509 to rotate. The deflection motor 1509 drives the deflection wedge wheel 1510 to rotate. The deflection wedge wheel 1510 will push open the mounting ring 1511, so that the angle of the measuring motor 2 changes, thereby avoiding excessive fluctuations from affecting the measuring motor 2 and increasing the safety of the product.

[0035] like Figure 7As shown, the excitation coil 9 is arranged on the top layer of the detection coil 8, and the symbol of the excitation coil is TxLoop, where Tx represents the signal access terminal. The receiving coil 10 includes a Sin coil 901 and a Cos coil 902, which are alternately and symmetrically distributed on the top layer and the bottom layer of the detection coil 8. The Sin coil is represented by RxSin, and the Cos coil is represented by RxCos. A small cylindrical coil 903 is arranged on the bottom layer of the detection coil 8, and the small cylindrical coil 903 is located directly below the excitation coil 9. The receiving coil 10 is divided into a Sin phase and a Cos phase, each of which has 2 turns. The pulse signals in each turn of the coil are represented by SinLoop1, SinLoop2, SinLoop3, SinLoop4, SinLoop5, SinLoop6, SinLoop7, SinLoop8, SinLoop9, SinLoop11, SinLoop9, SinLoop12, SinLoop13, SinLoop14, SinLoop15, SinLoop16, SinLoop17, SinLoop18, SinLoop29, SinLoop19, SinLoop210, SinLoop211, SinLoop212, SinLoop32, SinLoop19, SinLoop11 loop2 indicates that the two ends of the Sin coil 901 are Sin+ and Sin-, and the potential difference between the two is the voltage value Vsin of the Sin signal. There are two turns in one turn of Sin, one is Sin+ and the other is Sin-. Sin is the reversal point, and the same is true for Cos. Each turn of the Cos coil is represented by Cos Loop1 and Cos Loop2 respectively, and the instruction manual is attached. Figure 7 The pulse signal band of CosLoop1 is not complete, and Cos Loop1a can be used to represent a part of the pulse signal band, and Cos Loop1b can be used to represent another part of the pulse signal band. Therefore, if the two paths are set symmetrically, in the absence of the metal rotor 904, the electromotive force generated by a circle of Sin+ and a circle of Sin- cancel each other out, and the output is 0 voltage. In the case of the metal rotor 904, the signals generated by the two paths are also symmetrical, and the output voltage amplitude is uniform. The setting of the small cylindrical coil 903 is to enhance the magnetic field acceptance capability, because the closer to the coil, the stronger the magnetic field.

[0036] A rotor 904 is provided on the transmission rod 7. The center of the rotor 904 coincides with the center of the receiving coil 10. The rotor 904 is assembled just above the top layer of the receiving coil 10 with an air gap of 1 mm. The rotor 904 is parallel to the top layer of the receiving coil 10. The air gap is the most important factor affecting the magnetic field coupling strength between the rotor 904 and the excitation coil 9, and between the rotor 904 and the receiving coil 10.

[0037] The detection coil 8 is a PCB circuit board structure, and the ASIC circuit board 11 provides a 2MHZ-5MHZ signal for the excitation coil 9. The receiving coil 10 is set to 360° as a whole. The receiving coil 10 is alternately and symmetrically distributed on the top and bottom layers of the detection coil 8. The receiving coil 10 is located inside the excitation coil 9. The receiving coil 10 is provided with multiple commutation points on the top and bottom layers respectively. The existence of the commutation points is to ensure that the coil can have two different routing directions in the same phase, that is, to ensure the existence of Sin+ and Sin-. The line width of the excitation coil 9 is 0.1-0.5mm, and the line spacing of the excitation coil 9 is 0.5mm. The vias are not placed randomly, but are placed according to the circular ring rule, so that the current density flowing through is uniform. The number of turns of the excitation coil 9 is set according to the shape of the rotor 904 and the electromagnetic characteristics that affect each other. This board has 4 turns. The closer to the coil, the stronger the magnetic field. The excitation coil 9 is set on the top layer close to the rotor 904 to make the magnetic field coupled to the rotor 904 stronger, thereby generating a stronger reverse magnetic field, allowing the receiving coil 10 to decouple.

[0038] Working principle: First, the metal plate is fed into the heat preservation cover, and the discharging cylinder 1207 drives the turning folding frame 1206 to move, and then the measuring motor 2 is started. The measuring motor 2 drives the transmission rod 7 to rotate, and the angle between the support platform 3 and the detection platform 1 can also be adjusted to adapt to various slopes and metal plates of various thicknesses. By adapting to the movement of the motor 5 on the arc track 4, the angle between the support platform 3 and the detection platform 1 can be adjusted, and the ASIC circuit board 11 inputs a high-frequency AC signal to the excitation coil 9 to generate an alternating magnetic field. When high-frequency alternating current I1 is passed through the excitation coil 9, according to the right-hand screw rule, a downward time-varying magnetic field H1 will be generated in the coil. The magnetic field is coupled by the metal conductor, and then causes a change in magnetic flux in the metal conductor. According to Lenz's law, a counterclockwise vortex-like current I1 and an upward magnetic field eddy current generate an anti-magnetic field H2. The magnetic field induces a voltage in the detection coil 8. In the absence of a metal target, due to the anti-serial connection and balance between the line segments, the induced voltage is compensated for at each Zero output is achieved on the port. When the metal target is placed above the coil, the magnetic field induces eddy currents on the surface of the metal target, thereby reducing the total magnetic flux density below and reducing the voltage induced in the receiver coil area below the target, thereby generating unbalanced voltages Vsin and Vcos in the anti-serial coil. The amplitude and polarity of the output voltage signal change with the target position. Therefore, the position information of the metal target, arctan (Vsin / Vcos), can be obtained. During the detection process, the constant temperature cover ensures that the internal temperature is constant, and uses the temperature-sensitive resistor 1211 to sense the temperature of the metal target, and transmits the resistance change to the discharge cylinder 1207. The discharge cylinder 1207 can control the moving speed of the discharge cylinder 1207 according to the resistance change. The contact bar 1504 will sense the fluctuation of the metal target and transmit the fluctuation signal to the signal processor 1514. After the signal processor 1514 comprehensively processes the signal, it will control the deflection motor 1509 to rotate, thereby ensuring the safety of the measuring motor 2 and reducing damage to the metal target.

[0039] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. An angle measuring device for multi-metals using eddy current effect, characterized in that: The measuring device comprises a testing platform (1), wherein a measuring motor (2) is arranged on the testing platform (1), a supporting platform (3) is rotatably connected to the testing platform (1), an arc track (4) is arranged on the supporting platform (3), and teeth are arranged on the arc track (4), an adapting motor (5) is arranged on the testing platform (1), an adjusting gear (6) is arranged on the output end of the adapting motor (5), and the adjusting gear (6) meshes with the teeth on the arc track (4), a transmission rod (7) is arranged on the output end of the measuring motor (2), a detection coil (8) is arranged on the transmission rod (7), an excitation coil (9) and a receiving coil (10) are arranged on the detection coil (8), an ASIC circuit board (11) is arranged on the detection coil (8), a constant temperature cover (12) is arranged on the supporting platform (3), a discharge chute (13) is arranged in the constant temperature cover (12), and a slide frame (14) is arranged on the discharge chute (13).

2. The angle measuring device for multi-metals using eddy current effect according to claim 1, characterized in that: The constant temperature cover (12) is provided with a feed port (1201) and a discharge port (1202), a slide frame (14) is provided between the feed port (1201) and the discharge port (1202), the slide frame (14) comprises a lifting groove (1204), a plurality of lifting wheels (1205) are rotatably connected to the lifting groove (1204), a turning folding frame (1206) is provided on the lifting groove (1204), the turning folding frame (1206) is slidably connected to the lifting groove (1204), a discharge cylinder (1207) is provided on the turning folding frame (1206), a pushing clamp (1208) is provided on the output end of the discharge cylinder (1207), and the pushing clamp (1208) is slidably connected to the turning folding frame (1206).

3. The angle measuring device for multiple metals using eddy current effect according to claim 2, characterized in that: A heat-insulating interlayer (1209) is arranged in the constant temperature cover (12), a temperature-sensing frame (1210) is arranged in the constant temperature cover (12), a plurality of temperature-sensing resistors (1211) are evenly arranged on the temperature-sensing frame (1210), each of the temperature-sensing resistors (1211) is electrically connected to a discharge cylinder (1207) via a wire, a following frame (1212) is arranged on the temperature-sensing frame (1210), and the following frame (1212) is slidably connected to the lifting slot (1204).

4. The angle measuring device for multi-metals using eddy current effect according to claim 1, characterized in that: A contact assembly (15) is provided on the transmission rod (7), and the contact assembly (15) comprises a contact tube (1501). The contact tube (1501) is slidably connected to the transmission rod (7), and a sliding spring (1502) is provided in the contact tube (1501). Two ends of the sliding spring (1502) respectively abut against the transmission rod (7) and the contact tube (1501), and a plurality of sliding beads (1503) are provided on the contact tube (1501), and each sliding bead (1503) is rotatably connected to the bottom end of the contact tube (1501).

5. The angle measuring device for multiple metals using eddy current effect according to claim 4, characterized in that: The contact tube (1501) comprises a plurality of contact strips (1504), each of which is provided with a chimeric tube and a sliding groove, each of which is embedded in a corresponding sliding groove and is slidably connected to the sliding groove, each of which is provided with an anti-collision wedge groove (1505) at the bottom end, each of which is provided with a trigger tooth (1506), a trigger circuit board (1507) is provided on the transmission rod (7), and trigger switches (1508) are evenly provided on the trigger circuit board (1507).

6. The angle measuring device for multiple metals using eddy current effect according to claim 5, characterized in that: A deflection motor (1509) is arranged on the support platform (3); a deflection wedge wheel (1510) is arranged on the output end of the deflection motor (1509); the deflection wedge wheel (1510) abuts against a mounting ring (1511); the measuring motor (2) is arranged on the mounting ring (1511); the mounting ring (1511) is slidably connected to the support platform (3); a swing spring (1513) is arranged between the mounting ring (1511) and the support platform (3); a signal processor (1514) is arranged on the power supply end of the deflection motor (1509); the signal processor (1514) is electrically connected to the trigger circuit board (1507) via a wire.

7. The multi-metal angle measurement device using eddy current effect according to claim 1, characterized in that: The excitation coil (9) is arranged on the top layer of the detection coil (8); the receiving coil (10) comprises a Sin coil (901) and a Cos coil (902); the Sin coil (901) and the Cos coil (902) are alternately and symmetrically distributed on the top layer and the bottom layer of the detection coil (8); a small cylindrical coil (903) is arranged on the bottom layer of the detection coil (8); and the small cylindrical coil (903) is located directly below the excitation coil (9).

8. The angle measuring device for multiple metals using eddy current effect according to claim 7, characterized in that: The transmission rod (7) is provided with a rotor (904), the center of the rotor (904) coincides with the center of the receiving coil (10), the rotor (904) is mounted directly above the top layer of the receiving coil (10) with an air gap of 1 mm, and the rotor (904) is parallel to the top layer of the receiving coil (10).

9. The angle measuring device for multiple metals using eddy current effect according to claim 8, characterized in that: The detection coil (8) is a PCB circuit board structure, the ASIC circuit board (11) provides a 2MHZ-5MHZ signal for the excitation coil (9), the receiving coil (10) is arranged as a whole at 360°, the receiving coil (10) is alternately and symmetrically distributed on the top layer and the bottom layer of the detection coil (8), the receiving coil (10) is located inside the excitation coil (9), the receiving coil (10) is provided with four reversing points on the top layer and the bottom layer respectively, the line width of the excitation coil (9) is 0.1-0.5 mm, and the line spacing of the excitation coil (9) is 0.5 mm.

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