Signal enhancement detecting device of magnetostrictive liquid level meter and preparation method thereof

Abstract

The application provides a signal enhancement detection device of a magnetostrictive liquid level meter and a preparation method thereof, and belongs to the technical field of liquid level measurement. The device comprises a support, one end of the support is fixedly connected with a copper sleeve, one end of a waveguide wire penetrates through the copper sleeve and is welded with an end face of the copper sleeve. A detection band is further welded on the waveguide wire and located on the front side of the welded end face of the copper sleeve. A coil protection tube is fixedly arranged on the detection band. A detection coil is arranged outside the coil protection tube and fixed with the support. A permanent magnet is fixedly arranged outside the coil protection tube, the permanent magnet is fixed with the support and located below the detection coil. The device can effectively enhance the signal amplitude of the torsional wave, improve the measurable range of the magnetostrictive liquid level meter, and realize the liquid level measurement of multiple liquid surfaces without adding damping.

Description

Technical Field

[0001] This invention relates to the field of liquid level measurement technology, specifically to a signal enhancement and detection device for a magnetostrictive liquid level gauge and its preparation method. Background Technology

[0002] A magnetostrictive level gauge is a liquid level measuring device. Its sensor circuitry excites a pulsed current along a waveguide wire, generating a pulsed magnetic field around the wire as it propagates. A float is mounted outside the sensor rod, moving up and down along the rod as the liquid level changes. Inside the float is a set of permanent magnetic rings. When the pulsed current magnetic field meets the magnetic field generated by the float's magnetic rings, the magnetic field around the float changes, causing a torsional wave pulse to be generated at the float's location. This pulse travels back along the waveguide wire at a fixed speed and is detected by a detector. By measuring the time difference between the pulsed current and the torsional wave, the float's position, i.e., the liquid level, can be accurately determined.

[0003] When measuring multiple liquid levels, it is necessary to detect the torsional pulse waves of multiple floats. Since torsional pulse waves do not simply disappear, the torsional wave from one float becomes indistinguishable from the torsional wave from the next after rebounding through the waveguide wire. Generally, a damping device is added to absorb the torsional wave, ensuring that each float's torsional wave is detected only once. However, damping materials cannot completely absorb torsional waves, especially at low temperatures, where the damping effect is poor, easily causing the level gauge to malfunction. Furthermore, the torsional wave attenuates as it propagates along the waveguide wire, resulting in a signal at the end of the waveguide wire being too weak to be detected at the detection position when the signal reaches a large range.

[0004] Currently, to improve the normal detection range of level gauges, the excitation voltage and the amplification factor of the detection signal in the circuit are usually increased. However, this also leads to increased interference and a decrease in the level gauge's anti-interference capability. Purchasing imported high-quality waveguide wires can also improve the measurement range of level gauges, but imported waveguide wires are expensive and difficult to procure. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a signal enhancement and detection device for a magnetostrictive level gauge and its fabrication method. This device can effectively enhance the signal amplitude of torsional waves, improve the measurable range of the magnetostrictive level gauge, and enable multi-level liquid measurement without damping.

[0006] To achieve the above objectives, the present invention provides the following technical solution.

[0007] A signal enhancement and detection device for a magnetostrictive level gauge, mounted on the waveguide wire of the magnetostrictive level gauge, comprising:

[0008] support;

[0009] A copper sleeve is fixedly inserted into one end of the bracket; one end of the waveguide wire passes through the copper sleeve and is welded to the end face of the copper sleeve.

[0010] A detector strip is welded to the waveguide wire and located on the front side of the welded end face of the copper sleeve; a coil protection tube is fixedly sleeved on the detector strip;

[0011] The detector coil is sleeved outside the coil protection tube and fixed to the bracket;

[0012] The permanent magnet is fixedly installed outside the coil protection tube and fixed to the bracket, and is located below the detector coil;

[0013] The torsional wave pulse generated by the waveguide wire is transmitted to the welding position of the detector strip at a fixed speed. Part of the energy is transferred to the detector strip, and the other part continues to be transmitted, reflected by the end face of the copper sleeve, and transmitted back to the welding position of the detector strip along the waveguide wire, thereby achieving enhancement.

[0014] Preferably, the detector strip is located at a position 1 / 4 of the torsional wave wavelength distance in front of the copper sleeve welding end.

[0015] Preferably, the detector strip is located 3.5 to 5 mm in front of the copper sleeve welding end.

[0016] Preferably, the permanent magnet is located 1 to 3 mm below the detector coil.

[0017] Preferably, one end of the detector strip is welded to the waveguide wire without protrusion.

[0018] Preferably, the coil protection tube is fixed to the detector coil by adhesive bonding and does not come into contact with the detector strip.

[0019] Preferably, both the permanent magnet and the detector coil are glued to the bracket.

[0020] A method for fabricating a signal enhancement and detection device for a magnetostrictive level gauge includes the following steps:

[0021] Insert one end of the waveguide wire into the copper sleeve and weld the copper sleeve; wipe it clean with a lint-free cloth before welding. After welding, the solder joint of the waveguide wire copper sleeve contact end face is flat to ensure that the torsional wave is reflected normally at the end face.

[0022] Insert the copper sleeve into the bracket; adjust the insertion length according to the float and waveguide wire used.

[0023] Weld detector strip onto waveguide wire; during welding, wipe the wire clean with a lint-free cloth, cut one end flat, and weld the other end flush with the waveguide wire, welding to the center hole of the bracket. After welding, cut off the excess detector strip along the edge of the bracket.

[0024] A coil protection tube is fitted onto the detector tape, and a detector coil is fitted over the coil protection tube.

[0025] The detector coil is glued to the bracket, the coil protection tube is glued to the detector coil, and the permanent magnet is glued to the bracket facing the detector coil.

[0026] Preferably, it further includes:

[0027] The coil protection tube is cut to a length of 6-7mm. When inserting the coil protection tube, the front end of the coil protection tube should be 0.5-1mm away from the solder joint of the waveguide wire and the detector strip to ensure that the front end of the coil protection tube does not contact the solder joint.

[0028] Preferably, it further includes:

[0029] When installing the detector coil, observe the winding direction. Install it clockwise, aligning it with the winding direction. Select the magnet polarity for permanent magnet installation based on the polarity of the float magnet.

[0030] Beneficial effects of this invention:

[0031] This invention proposes a signal enhancement and detection device for a magnetostrictive level gauge. This device transfers a portion of the energy of the torsional wave generated by the waveguide wire to the strip, while the remaining energy continues to be transmitted along the waveguide wire. When the energy reaches the end face of the fixing device, it is reflected and transmitted back along the waveguide wire. After being transmitted to the strip position again, a portion of the energy is transmitted to the strip welding position again, so that the first half-wave of the torsional wave is superimposed on the other half-wave after rebounding. This enhances the signal amplitude of the torsional wave, increases the measurable range of the magnetostrictive level gauge, and enables multi-level liquid measurement without damping. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the signal enhancement and detection device for a magnetostrictive level gauge according to the present invention.

[0033] Figure 2 This is another partial structural schematic diagram of the signal enhancement and detection device for a magnetostrictive level gauge according to the present invention.

[0034] The components include: 1. waveguide wire; 2. copper sleeve; 3. detector strip; 4. coil protection tube; 5. detector coil; 6. bracket; 7. permanent magnet. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0036] Example 1

[0037] A signal enhancement and detection device for a magnetostrictive level gauge, such as Figure 1-2 As shown, the waveguide wire 1 installed on the magnetostrictive level gauge includes: a bracket 6; a copper sleeve 2 is fixedly inserted into one end of the bracket 6, and one end of the waveguide wire 1 passes through the copper sleeve 2 and is welded to its end face. A detector strip 3 is also welded onto the waveguide wire 1 and is located in front of the welded end face of the copper sleeve 2; a coil protection tube 4 is fixedly sleeved on the detector strip 3; a detector coil 5 is sleeved on the coil protection tube 4 and fixed to the bracket 6; a permanent magnet 7 is fixedly installed outside the coil protection tube 4, and the permanent magnet 7 is fixed to the bracket 6 and located below the detector coil 5, with the permanent magnet 7 located 1-3 mm below the detector coil 5.

[0038] The detector strip 3 is located approximately 3.5–5 mm in diameter, about one-quarter the distance from the torsional wave wavelength in front of the welding end of the copper sleeve 2. One end of the detector strip 3 is welded to the waveguide wire 1 without protrusion. The coil protection tube 4 is fixed to the detector coil 5 by adhesive bonding and does not contact the detector strip 3. Both the permanent magnet 7 and the detector coil 5 are glued to the bracket 6.

[0039] In this embodiment, the method for fabricating the signal enhancement and detection device of the magnetostrictive level gauge includes the following steps:

[0040] S1: Insert one end of waveguide wire 1 into bracket 6 and weld copper sleeve 2; wipe it clean with a dust-free cloth before welding. After welding, the weld point on the contact end face of waveguide wire 1 and copper sleeve 2 should be flat to ensure that the torsional wave is reflected normally at the end face.

[0041] S2: Insert the copper sleeve 2 into the bracket 6; wherein, the insertion length is adjusted according to the float and waveguide wire 1 used.

[0042] S3: Weld the detector strip 3 onto the waveguide wire 1; during welding, wipe it clean with a lint-free cloth, cut one end flat, and weld the other end flush with the waveguide wire 1, welding to the center hole of the bracket 6. After welding, cut off the excess detector strip 3 along the edge of the bracket 6.

[0043] S4: Insert the coil protection tube 4 onto the detector strip 3, and place the detector coil 5 on the outer sleeve of the coil protection tube 4; wherein, the coil protection tube 4 is cut to a length of 6-7mm, and when inserting the coil protection tube 4, the front end of the coil protection tube 4 is 0.5-1mm away from the solder joint of the waveguide wire 1 and the detector strip 3, to ensure that the front end of the coil protection tube 4 does not contact the solder joint.

[0044] S5: Glue the detector coil 5 to the bracket 6, glue the coil protection tube 4 to the detector coil 5, and glue the permanent magnet 7 to the bracket 6 facing the detector coil 5. When installing the detector coil 5, observe the winding direction. Install it clockwise when facing the winding direction. Select the magnet polarity of the permanent magnet 7 when installing it according to the installation polarity of the float magnet.

[0045] Function implementation method:

[0046] When the waveguide wire 1 is excited, the magnetic field around the float changes, causing the waveguide wire 1 to generate a torsional wave pulse at the position of the float. This pulse travels back along the waveguide wire 1 at a fixed speed. When the torsional wave reaches the welding position of the detector strip 3, part of the energy is transferred to the detector strip 3, and the other part of the energy continues to be transferred along the waveguide wire 1. When it reaches the end face of the copper sleeve 2, it is reflected and travels back along the waveguide wire 1. After it is transferred to the position of the detector strip 3 again, part of the energy is transferred back to the welding position of the detector strip 3.

[0047] The distance between the welding position of the detector strip 3 and the fixing device is 1 / 4 of the torsional wave wavelength. After the first half of the torsional wave bounces, it is superimposed on the other half of the wave, which can enhance the amplitude of the torsional waveform by 1.5 to 2 times.

[0048] After receiving the torsional wave, the detector tape 3 causes a change in the surrounding magnetic field due to the inverse effect of magnetostriction. The change in the magnetic field generates a corresponding induced voltage on the coil by the principle of electromagnetic induction. After amplification, filtering and shaping, the induced voltage can be detected by the waveform detection device.

[0049] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A signal enhancement and detection device for a magnetostrictive level gauge, mounted on the waveguide wire (1) of the magnetostrictive level gauge, characterized in that, include: Support (6); A copper sleeve (2) is fixedly inserted into one end of the bracket (6); one end of the waveguide wire (1) passes through the copper sleeve (2) and is welded to the end face of the copper sleeve (2); The detector strip (3) is welded to the waveguide wire (1) and located on the front side of the welding end face of the copper sleeve (2); a coil protection tube (4) is fixedly sleeved on the detector strip (3). The detector coil (5) is sleeved outside the coil protection tube (4) and fixed to the bracket (6); The permanent magnet (7) is fixed outside the coil protection tube (4) and fixed to the bracket (6), and is located below the detector coil (5); The torsional wave pulse generated by the waveguide wire (1) is transmitted to the welding position of the detector strip (3) at a fixed speed; part of the energy is transmitted to the detector strip (3), and the other part continues to be transmitted, reflected by the end face of the copper sleeve (2), and transmitted back to the welding position of the detector strip (3) along the waveguide wire (1) to achieve enhancement. The detector strip (3) is located at a position 1 / 4 of the torsional wave wavelength distance in front of the welding end of the copper sleeve (2), or at a position 3.5~5mm in front of the welding end of the copper sleeve (2); The coil protection tube (4) is fixed to the detector coil (5) by adhesive bonding and does not come into contact with the detector strip (3).

2. The signal enhancement and detection device for a magnetostrictive level gauge according to claim 1, characterized in that, The permanent magnet (7) is located 1-3 mm below the detector coil (5).

3. The signal enhancement and detection device for a magnetostrictive level gauge according to claim 1, characterized in that, One end of the detector strip (3) is welded to the waveguide wire (1) without protrusion.

4. The signal enhancement and detection device for a magnetostrictive level gauge according to claim 1, characterized in that, The permanent magnet (7) and the detector coil (5) are both glued to the bracket (6).

5. A method for preparing a signal enhancement and detection device for a magnetostrictive level gauge as described in any one of claims 1 to 4, characterized in that, Includes the following steps: Insert one end of the waveguide wire (1) into the copper sleeve (2) and weld the copper sleeve (2); wipe it clean with a dust-free cloth before welding. After welding, the weld point of the contact end face of the waveguide wire (1) and the copper sleeve (2) is flat to ensure that the torsional wave is reflected normally at the end face. Insert the copper sleeve (2) into the bracket (6); wherein the insertion length is adjusted according to the float and waveguide wire (1) used; Weld detector strip (3) onto waveguide wire (1); during welding, wipe it clean with a dust-free cloth, cut one end flat, weld the other end face flush with waveguide wire (1), weld to the center hole of bracket (6), and cut off the excess detector strip (3) along the edge of bracket (6) after welding. A coil protection tube (4) is fitted onto the detector strip (3), and a detector coil (5) is fitted over the coil protection tube (4). The detector coil (5) is glued to the bracket (6), the coil protection tube (4) is glued to the detector coil (5), and the permanent magnet (7) is glued to the bracket (6) facing the detector coil (5).

6. The method for preparing the signal enhancement and detection device for the magnetostrictive level gauge according to claim 5, characterized in that, Also includes: The coil protection tube (4) is cut to a length of 6-7mm. When the coil protection tube (4) is inserted, the distance between the front end of the coil protection tube (4) and the solder joint of the waveguide wire (1) and the detector strip (3) is 0.5-1mm, so as to ensure that the front end of the coil protection tube (4) does not contact the solder joint.

7. The method for preparing the signal enhancement and detection device for the magnetostrictive level gauge according to claim 5, characterized in that, Also includes: When installing the detector coil (5), observe the winding direction. Install it clockwise, facing the winding direction of the coil. Select the magnet polarity when installing the permanent magnet (7) according to the installation polarity of the float magnet.

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