CN102721428A - Speed-displacement sensor - Google Patents

Abstract

The invention discloses a speed-displacement sensor, comprising: a speed sensor base; a speed sensor excitation coil base, a gap groove is formed between the speed sensor excitation coil base and the speed sensor base, and a lead wire is provided on the speed sensor excitation coil base hole; one end is inserted into the secondary coil seat of the speed sensor on the outside of the excitation coil of the speed sensor by a gap slot; the connecting flange connected to the outer end of the secondary coil seat of the speed sensor, and the outer end of the connecting flange is provided with a connecting rod; and the connection method Connected with blue, and set on the soft iron pipe of the displacement sensor outside the secondary coil seat of the speed sensor; the sensor jacket is arranged on the outside of the soft iron pipe of the displacement sensor, and one end of the sensor jacket has an outlet end cover. The invention integrates the degree sensor and the displacement sensor by nesting each other, and has a compact structure and a small volume.

Description

A speed-displacement sensor

technical field

The invention relates to the technical field of sensors, in particular to a speed-displacement sensor.

Background technique

A sensor is a device that converts non-electricity into electrical signals. In recent years, sensors are in the development stage of transition from traditional to new sensors. The new sensor is characterized by miniaturization, digitalization, intelligence, multi-function, systematization, and networking. It not only promotes the transformation of traditional industries, but also leads to the establishment of new industries. It is a new economic growth point in the 21st century.

However, the signal output of the existing magnetoelectric speed sensor and differential transformer linear displacement sensor is output by independent speed sensor and displacement sensor, which must be installed separately and used separately, occupying a large space.

In addition, the differential transformer type linear displacement sensor adopts a two-stage or three-stage structure, and its exciting coil (primary coil) adopts a rectangular distribution, and the two secondary coils adopt a rectangular distribution. Both structures are suitable for small travel ranges, and the same The measuring range of the two-stage structure is larger than that of the three-stage structure under the axial length. Although the sensor with the above two structures can improve the accuracy of the sensor, the iron core of the sensor must have a certain length to increase its effect on the asymmetry of the coil, magnetic circuit and other parts; therefore, the iron core is always used in the design. The core is designed to be longer, which greatly increases the axial length of the entire sensor and the linearity error of the differential output voltage.

The iron core of the differential transformer type linear displacement sensor has a large mass, which is not conducive to improving the sensitivity of the sensor. The secondary coil of the magnetoelectric speed sensor is heavy, and the axial movement resistance is not considered. The magnetoelectric speed sensor uses a permanent magnet, which makes it heavy and bulky. The speed sensor and the displacement sensor are powered on and work, which is prone to mutual interference.

Therefore, how to reduce the volume of the speed sensor and the displacement sensor to make them compact has become an urgent problem to be solved by those skilled in the art.

Contents of the invention

In view of this, the present invention provides a velocity-displacement sensor to reduce the volume of the velocity sensor and the displacement sensor and make the structure compact.

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

A velocity-displacement sensor comprising:

Speed sensor base;

The speed sensor excitation coil base arranged in the center hole of the speed sensor base, the speed sensor excitation coil base is wound with a speed sensor excitation coil, between the speed sensor excitation coil base and the speed sensor base A gap groove is formed, and a lead wire hole and a central guide hole are opened on the base of the excitation coil of the speed sensor;

One end is inserted into the speed sensor secondary coil seat outside the speed sensor excitation coil through the gap slot, and the speed sensor secondary coil seat is wound with a speed sensor secondary coil;

A connecting flange connected to the outer end of the secondary coil base of the speed sensor, the outer end of the connecting flange is provided with a connecting rod;

The soft iron pipe of the displacement sensor is connected with the connecting flange and sleeved on the outside of the secondary coil seat of the speed sensor, and the outer side of the soft iron pipe of the displacement sensor is connected with the connecting flange through rivets;

Displacement sensor excitation coil seat arranged on the outside of the soft iron pipe of the displacement sensor, one end of the sensor outer cover has an outlet end cover; the speed sensor excitation coil, the speed sensor secondary coil displacement sensor excitation coil and the displacement sensor secondary coil The lead wires are led out from the outlet cover.

Preferably, in the above speed-displacement sensor, it also includes:

a wiring transition plate threadedly installed in the sensor housing;

A four-core socket for the secondary coil of the displacement sensor connected to the secondary coil of the displacement sensor through a wiring transition plate threadedly installed on the outlet end cover;

A speed sensor excitation coil socket that is threadedly installed on the outlet end cover and connected to the speed sensor excitation coil through a wiring transition plate;

A speed sensor secondary coil socket that is threadedly installed on the outlet end cover and connected to the speed sensor secondary coil through a wiring transition plate;

The zero adjustment knob of the speed sensor installed on the outlet end cover and connected with the wiring transition plate.

Preferably, in the above speed-displacement sensor, the outlet end cover is arranged on the sensor outer casing by countersunk screws.

Preferably, in the above speed-displacement sensor, the center hole of the speed sensor base is provided with an internal thread, and the speed sensor excitation coil base is set in the center hole of the speed sensor base through a nut and a washer.

Preferably, in the above speed-displacement sensor, one side of the flange end of the excitation coil base of the speed sensor is positioned by a nut, and the other side is positioned by a step in the center hole of the speed sensor base.

Preferably, in the above speed-displacement sensor, the outer side of the excitation coil of the speed sensor is covered with insulating paper.

Preferably, in the above speed-displacement sensor, the speed sensor base is provided with a guide hole, and the connecting flange is provided with a first guide post inserted into the guide hole.

Preferably, in the above speed-displacement sensor, the soft iron pipe of the displacement sensor is riveted on the connecting flange by rivets.

Preferably, in the above speed-displacement sensor, the secondary coil of the displacement sensor specifically includes:

The displacement sensor excitation coil uniformly wound on the displacement sensor excitation coil seat, the outer side is tapered and wound on the first-level secondary coil outside the displacement sensor excitation coil;

The second secondary coil is tapered and wound outside the first secondary coil, and the first secondary coil and the second secondary coil form a cylindrical displacement sensor secondary coil.

Preferably, in the above speed-displacement sensor, the diameter of the end of the primary secondary coil close to the end cover of the outgoing line is relatively large, and the diameter of the end of the secondary secondary coil away from the end cover of the outgoing line is relatively large.

Preferably, in the above speed-displacement sensor, the cylindrical secondary coil of the displacement sensor is arranged in the sensor casing, one end is positioned by the step of the sensor casing, and the other end is positioned by the flange end of the speed sensor base.

Preferably, in the above-mentioned speed-displacement sensor, there is an internal thread in the outer cover of the sensor close to the end cover of the outlet, and the wiring transition plate is arranged on the flange end of the speed sensor base through a lock nut and a bakelite pad and between the outlet cover;

There is an O-ring on the periphery of the wiring transition plate, and an O-ring on the end face;

The wiring transition plate is respectively connected to the excitation coil of the speed sensor, the secondary coil of the speed sensor, the excitation coil of the displacement sensor and the secondary coil of the displacement sensor through its terminal posts;

The wiring transition plate is close to the outlet end cover, and is connected to the two-core socket of the excitation coil of the displacement sensor, the excitation coil socket of the speed sensor, the secondary coil socket of the speed sensor, the four-core socket of the secondary coil of the displacement sensor and the speed sensor Zero adjustment knob connection.

It can be seen from the above technical scheme that the speed-displacement sensor provided by the present invention provides a mating space for the secondary coil seat of the speed sensor by forming a gap groove between the base of the excitation coil of the speed sensor and the base of the speed sensor; Connect the flange and the speed sensor base to realize the installation and positioning of the soft iron pipe of the displacement sensor, thereby providing the installation foundation for the excitation coil of the displacement sensor and the secondary coil of the displacement sensor. The invention integrates the degree sensor and the displacement sensor by nesting each other, and has a compact structure and a small volume.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic diagram of the assembly structure of the speed-displacement sensor provided by the embodiment of the present invention;

Fig. 2 is a schematic structural view of an outlet end cover provided by an embodiment of the present invention;

Fig. 3 is a side view of Fig. 2;

4 is a schematic diagram of the assembly structure of the speed sensor base provided by the embodiment of the present invention;

5 is a cross-sectional view of a speed sensor base provided by an embodiment of the present invention;

6 is a schematic diagram of the assembly of the secondary coil group and soft iron of the displacement sensor provided by the embodiment of the present invention;

Fig. 7 is a cross-sectional view of the assembly of the secondary coil group and soft iron of the displacement sensor provided by the embodiment of the present invention;

FIG. 8 is an equivalent circuit diagram of a differential transformer provided by an embodiment of the present invention;

Fig. 9 is a functional block diagram of the dynamic cylinder measurement and control part provided by the embodiment of the present invention;

Fig. 10 is an electrical schematic diagram of the displacement sensor provided by the embodiment of the present invention.

Detailed ways

The invention discloses a velocity-displacement sensor to reduce the volume of the velocity sensor and the displacement sensor and make the structure compact.

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to Figure 1-Figure 7, Figure 1 is a schematic diagram of the assembly structure of the speed-displacement sensor provided by the embodiment of the present invention, Figure 2 is a schematic structural diagram of the outlet end cover provided by the embodiment of the present invention; Figure 3 is a side view of Figure 2 ; Figure 4 is a schematic diagram of the assembly structure of the speed sensor base provided by the embodiment of the present invention; Figure 5 is a cross-sectional view of the speed sensor base provided by the embodiment of the present invention; Figure 6 is the secondary coil group of the speed sensor provided by the embodiment of the present invention and the assembly diagram of the soft iron of the displacement sensor; FIG. 7 is a cross-sectional view of the assembly of the secondary coil group of the speed sensor and the soft iron of the displacement sensor provided by the embodiment of the present invention.

The speed-displacement sensor provided by the embodiment of the present invention includes a speed sensor base 22, a speed sensor excitation coil base 20, a speed sensor secondary coil seat 38, a connecting flange 16, a displacement sensor soft iron pipe 19, a wiring transition plate 10, Outlet end cover 5 , displacement sensor coil seat 14 and sensor jacket 26 .

Wherein, the speed sensor exciting coil base 20 is arranged in the central hole of the speed sensor base 22, the speed sensor exciting coil base 20 is wound with the speed sensor exciting coil 21, and the speed sensor exciting coil base 20 and the speed sensor base 22 form a There is a gap slot 28, and a center hole 30 is opened on the base 20 of the excitation coil of the speed sensor. The central hole 30 is used to realize the insertion of the guide rod 36 , and the gap slot 28 is used to realize the insertion of the secondary coil seat 38 of the speed sensor.

One end of the speed sensor secondary coil base 38 is inserted into the outside of the speed sensor excitation coil 21 through the gap slot 28 , and the speed sensor secondary coil base 38 is wound with the speed sensor secondary coil 18 .

The connecting flange 16 is connected to the outer end of the secondary coil base 38 of the speed sensor, the outer end of the connecting flange 16 is provided with a connecting rod 15 , and the inner end is provided with a guide rod 36 .

The soft iron pipe 19 of the displacement sensor is connected with the connecting flange 16 through a rivet 34 , and is sheathed on the outside of the secondary coil seat 38 of the speed sensor. The displacement sensor coil base 14 is arranged on the outside of the speed sensor base 22 and the displacement sensor soft iron pipe 19 , and the displacement sensor coil base 14 is wound with a displacement sensor excitation coil 11 and a displacement sensor secondary coil.

Sensor overcoat 26 is arranged on the outside of displacement sensor coil seat 14, and one end of sensor overcoat 26 has outlet end cover 5, and the lead wire of speed sensor excitation coil 21, speed sensor secondary coil 18 displacement sensor excitation coil 11 and displacement sensor secondary coil passes The wiring transition plate 10 is welded (for example, the secondary coil lead wire 35 of the displacement sensor, and the other lead wires are not labeled) and are led out from the outlet end cover 5 .

The speed-displacement sensor provided by the present invention provides a mating space for the secondary coil seat 38 of the speed sensor by forming a gap groove 28 between the speed sensor exciting coil base 20 and the speed sensor base 22; through the connecting flange 16 and The speed sensor base 22 realizes the installation and positioning of the soft iron pipe 19 of the displacement sensor, thereby providing an installation basis for the displacement sensor coil seat 14, the displacement sensor excitation coil 11 and the displacement sensor secondary coils 12, 13. The invention integrates the degree sensor and the displacement sensor by nesting each other, and has a compact structure and a small volume.

As shown in Figure 2 and Figure 3, in order to further optimize the above-mentioned technical scheme, the present invention also includes displacement sensor excitation coil socket 1, displacement sensor secondary coil socket 2, speed sensor excitation coil socket 27, speed sensor secondary coil socket 4 and Speed sensor zero adjustment knob 3.

Among them, the displacement sensor excitation coil socket 1 (a two-core socket) is installed on the outlet end cover 5 through threads, and is connected with the displacement sensor excitation coil 11 through a wiring transition plate 10; the displacement sensor secondary coil socket 2 (a four-core socket) Installed on the outlet end cover 5 through threads, and connected with the secondary coil of the displacement sensor through the wiring transition plate 10; the speed sensor excitation coil socket 27 (a two-core socket) is installed on the outlet end cover 5 through threads, and connected with the speed sensor excitation coil 21 is connected through the wiring transition board 10; the speed sensor secondary coil socket 4 (a one-core socket) is installed on the outlet end cover 5 through threads, and is connected with the speed sensor secondary coil 18 through the wiring transition board 10; the speed sensor zero adjustment screw The twist 3 is installed on the outlet end cover 5 and connected through the wiring transition board 10 . The present invention makes the zero adjustment more convenient by installing the speed sensor zero adjustment knob 3 on the outlet end cover 5 .

The outgoing line end cover 5 is arranged on the sensor casing 26 through the countersunk head screw 6 , and there are eight positioning holes matched with the countersunk head screw 6 on the upper outer end of the outgoing line end cover 5 .

As shown in Fig. 4 and Fig. 5, in this embodiment, the center hole of the speed sensor base 22 is provided with an internal thread, and the speed sensor excitation coil base 20 is arranged on the center of the speed sensor base 22 through a nut 24 and a washer 23. inside the hole. One side of the flange end of the speed sensor excitation coil base 20 is positioned by a nut 24 , and the other side is positioned by a step in the center hole of the speed sensor base 22 . The lead end of the excitation coil of the speed sensor is introduced into the inner cavity of the speed sensor base 22 through the guide hole 31 .

In this embodiment, the outer side of the excitation coil 21 of the speed sensor is covered with insulating paper 32 . The speed sensor base 22 is provided with a guide hole 29, and the connecting flange 16 is provided with a first guide column 17 inserted into the guide hole 29. The first guide column 17 is installed on the connecting flange 16 through a nut 33, and the guide rod 36 The central position of the connecting flange 16 is coaxial with the connecting rod 15 to realize accurate positioning of the soft iron pipe 19 of the displacement sensor.

As shown in FIG. 6 and FIG. 7 , the soft iron pipe 19 of the displacement sensor is riveted on the connecting flange 16 through a rivet 34 .

In this embodiment, the secondary coils of the displacement sensor specifically include a primary secondary coil 12 and a secondary secondary coil 13 .

Wherein, the first-level secondary coil 12 is conically wound outside the excitation coil 11 of the displacement sensor, the second-level secondary coil 13 is conically wound outside the first-level secondary coil 12, and the first-level secondary coil 12 and The secondary secondary coil 13 forms a cylindrical displacement sensor secondary coil. The diameter of the end of the first-level secondary coil 12 close to the end cover 5 is relatively large, and the diameter of the end of the second-level secondary coil 13 away from the end cover 5 is relatively large. The secondary coil of the cylindrical displacement sensor is arranged in the sensor casing 26 , one end is positioned by the step of the sensor casing 26 , and the other end is positioned by the flange end of the speed sensor base 22 .

The differential transformer type linear displacement sensor adopts a one-stage structure, and the excitation coil 11 (primary coil) of the displacement sensor adopts a rectangular distribution, and the two secondary coils (the primary secondary coil 12 and the secondary secondary coil 13) adopt a conical structure (i.e. cross-sectional triangular distribution), reducing the linearity error of the differential output voltage without increasing the length of the entire sensor.

The differential transformer type linear displacement sensor has the characteristics of long life, high precision, good mechanical strength, low thermal drift, etc., and theoretically has no range limit. In addition, the excitation coil 11 (primary coil) of the displacement sensor adopts a rectangular distribution, and the two secondary coils adopt a triangular distribution. Its advantage is that the output accuracy has nothing to do with the length of the iron core, the linear error of its output characteristics is small, the linearity is high, and it can realize more accurate measurement and control; the output voltage has a linear relationship with the displacement, which can reduce the volume of the product and improve its performance. linearity.

The iron core of the differential transformer type linear displacement sensor is a thin cylindrical displacement sensor soft iron tube, which reduces the quality of the moving parts and improves the sensitivity of the sensor.

Weld the lead wire of the integrated speed-displacement sensor to the welding point of the wiring transition plate 10, weld the corresponding color of the reverse side of the wiring transition plate 10, and install the O-ring 25 on the end surface of the wiring transition plate 10 to realize the wiring transition The seal between the board 10 and the speed sensor base 22, the O-ring 9 is installed on the circumference of the wiring transition plate 10 to realize the sealing between the wiring transition plate 10 and the sensor outer casing 26, and then the wiring transition plate 10 is installed in the sensor 26 inside the coat. Lock the speed sensor base 22 with the lock nut 7 through the bakelite pad 8 . Weld the lead-out wires on the wiring transition board 10 to the socket terminals of the lead-out end cover 5 as required. The outlet end cover 5 connected with the wire is fixedly installed on the sensor outer cover 26 through countersunk head screws 16 (8 pieces).

Electrical parts

(1) The working principle of the speed sensor

When the coil moves to cut the magnetic force line, the law of electromagnetic induction can get:

e ₀ =NBlv (4-1)

In formula (4-1):

e ₀ — output terminal voltage (V);

N—the number of turns of the coil;

B—magnetic induction (T);

l—the average length of the coil per turn (m);

v—the moving speed of the coil relative to the magnetic field (m/s).

It can be seen from formula (4-1): For a certain coil and magnetic field, the output terminal voltage e ₀ is a proportional function of the moving speed v, which meets the linearity requirement of the sensor.

(2) The working principle of the displacement sensor

Please refer to FIG. 8 . FIG. 8 is an equivalent circuit diagram of a differential transformer provided by an embodiment of the present invention.

—初级线圈励磁电压；R₁—初级线圈有效电阻；L₁—初级线圈电感；M₁、M₂—初级线圈和次级线圈之间的互感；

—一级次级线圈和二级次级线圈的感应电动势；

—初级线圈激励电流；R₂₁、R₂₂—一级次级线圈和二级次级线圈的有效电阻。After ignoring the influence of eddy current loss, hysteresis loss and distributed capacitance of the differential transformer, the differential transformer can be regarded as an ideal model, and its equivalent circuit is shown in Figure 8. In the picture: (

— Primary coil excitation voltage; R ₁ — Primary coil effective resistance; L ₁ — Primary coil inductance; M ₁ , M ₂ — Mutual inductance between primary coil and secondary coil;

- the induced electromotive force of the primary secondary coil and the secondary secondary coil;

—the excitation current of the primary coil; R ₂₁ , R ₂₂ —the effective resistance of the primary secondary coil and the secondary secondary coil.

$\stackrel{\mathrm{<span\; class="notranslate">\; g</span>}}{\mathrm{<span\; class="notranslate">\; I</span>}}<span\; class="notranslate">\; =</span>\frac{\stackrel{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="g\; R"\; filenames="HDA00001851160700011.png,HDA00001851160700012.png"\; state="\{\{state\}\}">g</figure-callout></span><figure-callout\; id="1"\; label="g\; R"\; filenames="HDA00001851160700011.png,HDA00001851160700012.png"\; state="\{\{state\}\}">\; </figure-callout>}}{\mathrm{<span\; class="notranslate">\; I</span>}}}{{\mathrm{<span\; class="notranslate">\; </span>}}_{}}<span\; class="notranslate">\; ;</span>$ ${\stackrel{\mathrm{<span\; class="notranslate">\; g</span>}}{\mathrm{<span\; class="notranslate">\; u</span>}}}_{\mathrm{<span\; class="notranslate">\; twenty\; one</span>}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; j\&omega;</span>}{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\stackrel{\mathrm{<span\; class="notranslate">\; g</span>}}{\mathrm{<span\; class="notranslate">\; I</span>}}<span\; class="notranslate">\; ;</span>$ ${\stackrel{\mathrm{<span\; class="notranslate">\; g</span>}}{\mathrm{<span\; class="notranslate">\; u</span>}}}_{\mathrm{<span\; class="notranslate">\; twenty\; two</span>}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; j\&omega;</span>}{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}\stackrel{\mathrm{<span\; class="notranslate">\; g</span>}}{\mathrm{<span\; class="notranslate">\; I</span>}}<span\; class="notranslate">\; .</span>$

So there are: ${\stackrel{g}{\mathrm{<figure-callout\; id="0"\; label="u\; g"\; filenames="HDA00001851160700051.png"\; state="\{\{state\}\}">u</figure-callout>}}}_0={\stackrel{g}{u}}_{\mathrm{twenty\; one}}-{\stackrel{g}{u}}_{\mathrm{twenty\; two}}=-\mathrm{j\&omega;}((m_1-m_2)\stackrel{g}{u/}({\mathrm{<figure-callout\; id="1"\; label="R"\; filenames="HDA00001851160700011.png,HDA00001851160700012.png"\; state="\{\{state\}\}">R</figure-callout>}}_1+\mathrm{j\&omega;}{L}_1);$

Valid values: ${\mathrm{<figure-callout\; id="0"\; label="u"\; filenames="HDA00001851160700051.png"\; state="\{\{state\}\}">u</figure-callout>}}_0=\mathrm{\&omega;}(m_1-m_2)u/\sqrt{{\mathrm{<figure-callout\; id="1"\; label="R"\; filenames="HDA00001851160700011.png,HDA00001851160700012.png"\; state="\{\{state\}\}">R</figure-callout>}}_1^2+{\left(\mathrm{\&omega;}{L}_1\right)}^2}$

When the iron core moves upward: M ₁ =M+△M; M ₂ =M-△M;

${\mathrm{<span\; class="notranslate">\; <figure-callout\; id="0"\; label="u"\; filenames="HDA00001851160700051.png"\; state="\{\{state\}\}">u</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; \&omega;\&Delta;</span>}{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\mathrm{<span\; class="notranslate">\; u</span>}<span\; class="notranslate">\; /</span>\sqrt{{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="R"\; filenames="HDA00001851160700011.png,HDA00001851160700012.png"\; state="\{\{state\}\}">R</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&omega;</span>}{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; .</span>$

When the core moves down: ${\mathrm{<figure-callout\; id="0"\; label="u"\; filenames="HDA00001851160700051.png"\; state="\{\{state\}\}">u</figure-callout>}}_0=2\mathrm{\&omega;\&Delta;}{m}_{1}u/\sqrt{{\mathrm{<figure-callout\; id="1"\; label="R"\; filenames="HDA00001851160700011.png,HDA00001851160700012.png"\; state="\{\{state\}\}">R</figure-callout>}}_1^2+{\left(\mathrm{\&omega;}{L}_1\right)}^2}.$

When the iron core is in the middle position: M ₁ =M ₂ =M; U ₀ =0.

It can be seen that with the movement of the iron core, the magnitude of its output voltage changes. The change of the iron core position can be judged by measuring the change of the output voltage.

(2) Working process of the displacement sensor

See Figure 9 and Figure 10. Fig. 9 is a functional block diagram of the dynamic cylinder measurement and control part provided by the embodiment of the present invention; Fig. 10 is an electrical schematic diagram of the displacement sensor provided by the embodiment of the present invention.

The 12VDC DC power supply of the displacement sensor is input through the IN ₊ and _IN- terminals of the 7808 three-terminal voltage regulator chip, and is converted into +8VDC VDD output by the 7808 chip. After VDD is input into the LMC7660IN chip, it is converted into -VDD output of -8VDC. VDD and -VDD are also used as the working power supply of the LM258P amplifier. After VDD is input to the CD4069UBCN chip, an alternating current signal signal is generated to excite the differential transformer T1. The alternating signal output by T1 is rectified by two bridge rectifier circuits composed of D1~D8, and then input to the filter and amplifier circuit composed of the LM258P chip. , and then output a DC voltage signal of 0~5VDC, which is the output signal of the displacement sensor.

The K1 relay controls the excitation power supply of the speed sensor and the displacement sensor and the connection and disconnection of the excitation coil, so as to realize the time-sharing work of the two.

1. The displacement sensor described in the present invention is a differential transformer linear displacement sensor, which belongs to the inductive displacement sensor, and the speed sensor is a magnetoelectric speed sensor, which also belongs to the inductive type. Each sensor can work in time-sharing mode.

2. The present invention can use a resistive displacement sensor to replace the differential transformer linear displacement sensor in the above embodiment, while the speed sensor still uses a magnetoelectric speed sensor, and the two sensors can work synchronously.

3. Because the mechanical structure and electrical principle and electrical structure of the resistive displacement sensor are simpler than the differential transformer type linear displacement sensor, it is not described in detail in the present invention, but it should be used as the protection object of the present invention.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other. The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A speed-displacement sensor, characterized in that, comprising: Speed sensor base (22); A speed sensor excitation coil base (20) arranged in the center hole of the speed sensor base (22), a speed sensor excitation coil (21) wound on the speed sensor excitation coil base (20), the speed sensor A gap groove (28) is formed between the excitation coil base (20) and the speed sensor base (22), and a lead hole (29) and a central guide hole (30) are opened on the speed sensor excitation coil base (20). ); One end is inserted into the speed sensor secondary coil seat (38) outside the speed sensor excitation coil (21) through the gap slot (28), and the speed sensor secondary coil seat (38) is wound with a speed sensor secondary coil (18); A connecting flange (16) connected to the outer end of the secondary coil seat (38) of the speed sensor, the outer end of the connecting flange (16) is provided with a connecting rod (15); The soft iron pipe (19) of the displacement sensor is connected with the connecting flange (16) and sleeved on the outside of the secondary coil seat (38) of the speed sensor, and the soft iron pipe (19) of the displacement sensor is passed through a rivet on the outside (34) is connected with the connection flange (16); The displacement sensor excitation coil seat (14) is arranged on the outside of the displacement sensor soft iron pipe (19), and one end of the sensor jacket (26) has an outlet end cover (5); the speed sensor excitation coil (21), The secondary coil (18) of the speed sensor, the excitation coil (11) of the displacement sensor and the lead wires of the secondary coil of the displacement sensor are led out from the outlet end cover (5). 2. The speed-displacement sensor according to claim 1, further comprising: The wiring transition plate (10) is threadedly installed in the sensor outer casing (26); The displacement sensor secondary coil four-core socket (2) is threaded on the outlet end cover (5) and connected to the displacement sensor secondary coil through the wiring transition plate (10); The speed sensor excitation coil socket (27) is threadedly installed on the outlet end cover (5) and connected to the speed sensor excitation coil (21) through the wiring transition plate (10); A speed sensor secondary coil socket (4) that is threaded on the outlet end cover (5) and connected to the speed sensor secondary coil (18) through a wiring transition plate (10); The speed sensor zero adjustment knob (3) installed on the outlet end cover (5) and connected to the wiring transition plate (10). 3 . The speed-displacement sensor according to claim 1 , characterized in that, the outlet end cover ( 5 ) is arranged on the sensor outer casing ( 26 ) through countersunk screws ( 6 ). 4. The speed-displacement sensor according to claim 1, characterized in that, the center hole of the speed sensor base (22) is provided with an internal thread, and the speed sensor excitation coil base (20) is passed through a nut (24 ) and a washer (23) are arranged in the center hole of the speed sensor base (22). 5. The speed-displacement sensor according to claim 4, characterized in that, one side of the flange end of the speed sensor excitation coil base (20) is positioned by a nut (24), and the other side is positioned by the speed sensor base. The step location of seat (22) center hole. 6. The speed-displacement sensor according to claim 1, characterized in that, the speed sensor base (22) is provided with a guide hole (29), and the connecting flange (16) is provided with a guide hole for inserting into the guide hole. The first guide post (17) in the hole (29). 7. The speed-displacement sensor as claimed in claim 1, wherein the secondary coil of the displacement sensor specifically comprises: The displacement sensor excitation coil (11) evenly wound on the displacement sensor excitation coil base (14), and the first-level secondary coil (12) wound outside the displacement sensor excitation coil (11) with a tapered outer side; The second secondary coil (13) is tapered and wound on the outside of the first secondary coil (12), and the first secondary coil (12) and the second secondary coil (13) form a circle Cylindrical displacement sensor secondary coil. 8. The speed-displacement sensor according to claim 7, characterized in that, the diameter of the end of the first-level secondary coil (12) close to the outlet end cover (5) is larger, and the second-level secondary coil (13) The diameter of the end away from the outlet end cover (5) is larger. 9. The speed-displacement sensor according to claim 8, characterized in that, the cylindrical secondary coil of the displacement sensor is arranged in the sensor jacket (26), one end is positioned by the sensor jacket (26) step, and the other end Locate by the flanged end of the speed sensor base (22). 10. The speed-displacement sensor according to claim 2, characterized in that, the sensor casing (26) has internal threads close to the outlet end cover (5), and the wiring transition plate (10) is locked by locking The nut (7) and bakelite pad (8) are arranged between the flange end of the speed sensor base (22) and the outlet end cover (5); There is an O-ring (9) on the periphery of the wiring transition plate (10), and an O-ring (25) on the end face; The wiring transition plate (10) is respectively connected to the excitation coil of the speed sensor, the secondary coil of the speed sensor, the excitation coil of the displacement sensor and the secondary coil of the displacement sensor through its terminal posts; The wiring transition plate (10) is close to the outlet end cover (5), respectively connected to the displacement sensor excitation coil two-core socket (1), the speed sensor excitation coil socket (27), the speed sensor secondary coil socket (4 ), the four-core socket (2) of the secondary coil of the displacement sensor and the zero adjustment knob (3) of the speed sensor are connected.

Images