JP2016188797A - Differential transformer with position adjustment mechanism and position adjustment method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily perform a zero-point adjustment through arranging a position adjustment mechanism for performing the zero-point adjustment of a differential transformer inside a cylindrical case.SOLUTION: In a differential transformer with a position adjustment mechanism and a position adjustment method thereof, a cylindrical bobbin (23) having a coil (2) is movably arranged on an outer periphery of a fixation tube body (20) inside a cylindrical case (1), and a nut (27) screwed via a thread part (26) is caused to abut on the cylindrical bobbin (23), interposing a washer (28), inside the cylindrical case (1). The cylindrical bobbin (23) is directly moved by the rotation of the nut (27), so as to perform a zero-point adjustment.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a differential transformer with a position adjusting mechanism, and in particular, a position adjusting mechanism for adjusting a reference position (zero position) required when an operating differential transformer is attached to a device. The present invention relates to a new improvement for incorporating in a case.

As this type of differential transformer with a position adjusting mechanism that has been conventionally used, for example, the configuration disclosed in Patent Document 1 shown in FIGS.
That is, what is indicated by reference numeral 1 in FIGS. 5 to 7 is a longitudinal case for constituting a known differential transformer, and a cylindrical detection winding 2 is formed inside the case 1. Is provided. One end 1 a side of the case 1 is held through a hole 4 formed in the first member 3, and the flange portion 5 formed in the case 1 abuts on the inner side of the first member 3. The first screw portion 6 formed integrally with the case 1 is located so as to protrude outward from the hole 4. Since the diameter D ₁ of the first screw portion 6 is sufficiently larger than the inner diameter D _{2 of the} hole 4, and no screw portion or the like is formed on the inner surface of the hole 4, the first screw portion 6 The portion 6 is configured so that it can easily penetrate the hole 4. A cylindrical guide portion 7 is integrally formed at an outer position of the first screw portion 6, and the lead wire 2 a of the detection winding 2 is led out through the guide portion 7. Further, when the first nut 8 screwed into the first screw portion 6 is tightened, the first nut 8 is fixed to the first member 3 and the case 1 is fixed to the first member 3.

  The core 11 of the non-circular probe 10 provided in the case 1 and removably in the detection winding 2 is configured to move linearly according to the stroke of the detection winding 2. As shown in FIG. 7, the end 1b of the case 1 is provided with a non-circular guide portion 12 having a non-circular hole 12a (in the figure, it is hexagonal, but other shapes are also possible). The non-circular probe 10 penetrates freely, and the cross-sectional shape of the non-circular probe 10 is also a hexagonal non-circular shape that follows the hole 12a. The shape of the hole 12a and the non-circular probe 10 may be non-circular, and is not limited to a hexagon.

  A second screw portion 11 is formed at the tip of the non-circular probe 10, and the second screw portion 13 is screwed into a screw hole 14 a of a second member 14 disposed opposite to the first member 3. A second nut 15 is screwed into the second screw portion 13 that penetrates the member 13.

  Next, the operation will be described. First, in the state of FIG. 5, the nuts 8 and 15 are loosened, the case 1 and the first member 3 are released, and then only the case 1 is rotated in either the left or right direction. Since the first screw portion 13 moves in and out of the second member 14, the relative position between the core 11 and the detection winding 2 changes, and the electrical zero position of the differential transformer (shown in FIG. 8). The position can be determined by detecting the above. Further, in the state where the zero position is positioned, the nuts 8 and 15 are tightened to fix the case 1 and the first member, and the non-circular probe 10 is fixed to the second member 14. By moving one or both of the members 3 and 14, it is possible to detect the position of each of the members 3 and 14 or the position therebetween.

JP-A-10-170209

Since the conventional differential transformer with a position adjusting mechanism is configured as described above, the following problems exist.
That is, the second screw portion 13 formed at the end of the non-circular probe 10 provided so as to freely enter and leave the case 1 screwed to the first member 3 must be screwed into the second member 14. In order to perform zero adjustment (alignment of the reference point) of the dynamic transformer, the case 1 itself had to be rotated, and it took a lot of time and labor to attach the differential transformer to the device. .

  The present invention has been made to solve the above-described problems. In particular, a position adjustment mechanism for reference alignment required when mounting an operating differential transformer on a device is provided as a case of the differential transformer. It is an object of the present invention to provide a differential transformer with a position adjusting mechanism incorporated in the inside.

  A differential transformer with a position adjusting mechanism according to the present invention includes a fixed tube body having a cylindrical extension fixed to one end of a cylindrical case, a probe provided in the cylindrical extension, and the cylindrical extension. A cylindrical bobbin that is operably provided on the outer circumference of the cylindrical bobbin, and is provided between the cylindrical bobbin and a step portion of the fixed tube body, and the cylindrical bobbin is attached to the other end side of the cylindrical case. An elastic body for biasing, an opening with a threaded portion provided on the other end side of the cylindrical case, a nut provided on the other end side in the cylindrical case and screwed into the opening, And a washer provided between the cylindrical bobbin and the nut. The nut, the opening and the washer form a position adjusting mechanism, and the cylindrical bobbin is linearly moved by the rotation of the nut. Yes, installed on the fixed tube body The guide pin engaged with the slit of the cylindrical bobbin is configured such that rotation prevention and linear motion guide of the cylindrical bobbin are performed by the guide pin and the slit, and on the inner surface of the cylindrical case Is provided with a cylindrical magnetic shield plate to prevent leakage of magnetic flux generated from the windings to the outside of the cylindrical case, and the differential transformer with a position adjusting mechanism according to the present invention. The position adjusting method is provided on a fixed tube body fixed to one end of the cylindrical case and having a cylindrical extension, a probe provided in the cylindrical extension, and an outer periphery of the cylindrical extension. A cylindrical bobbin having a winding; and an elastic body provided between the cylindrical bobbin and the step portion of the fixed tube body for biasing the cylindrical bobbin toward the other end of the cylindrical case; Provided on the other end side of the cylindrical case An opening with a threaded portion, a nut provided on the other end side in the cylindrical case and screwed into the opening, and a washer provided between the cylindrical bobbin and the nut, The nut, the opening, and the washer form a position adjusting mechanism, and the cylindrical bobbin is moved linearly by turning the nut. The guide pin provided on the fixed tube body is the cylindrical shape. In this method, the cylindrical bobbin is engaged with the slit of the bobbin so that rotation prevention and linear motion guide of the cylindrical bobbin are performed by the guide pin and the slit, and the inner surface of the cylindrical case has a cylindrical shape. In this method, a magnetic shield plate is provided to prevent leakage of magnetic flux generated from the winding to the outside of the cylindrical case.

Since the differential transformer with a position adjusting mechanism and the position adjusting method according to the present invention are configured as described above, the following effects can be obtained.
That is, a fixed tube body fixed to one end of the cylindrical case and having a cylindrical extension, a probe provided in the cylindrical extension, and a winding operably provided on the outer periphery of the cylindrical extension. A cylindrical bobbin having an elastic body that is provided between the cylindrical bobbin and a step portion of the fixed tube body and biases the cylindrical bobbin toward the other end side of the cylindrical case; An opening with a threaded portion provided on the other end side of the case, a nut provided on the other end side in the cylindrical case and screwed into the opening, and provided between the cylindrical bobbin and the nut A position adjusting mechanism is formed by the nut, the opening, and the washer, and the cylindrical bobbin is linearly moved by the rotation of the nut, thereby rotating the nut in the case. The cylindrical bobbin can be directly Are allowed, it is zero positioning of the windings relative to the probe, the entire system is downsized, without imposing labor on the user side, it can easily position adjustment.
Further, the guide pin provided in the fixed tube body is engaged with the slit of the cylindrical bobbin, and the rotation stop and the linear motion guide of the cylindrical bobbin are performed by the guide pin and the slit. Further, the linear movement of the cylindrical bobbin can be performed smoothly.
In addition, a cylindrical magnetic shield plate is provided on the inner surface of the cylindrical case, and prevents leakage of magnetic flux generated from the winding to the outside of the cylindrical case. Magnetic influence on other devices can be prevented.

It is sectional drawing which shows the differential transformer with a position adjustment mechanism by this invention. It is a left view of FIG. It is a right view of FIG. It is a front view which shows the probe of FIG. It is a partial cross section block diagram which shows a conventional structure. FIG. 6 is a cutaway cross-sectional view of the main part of FIG. 5. It is an enlarged side view of the guide part of FIG. FIG. 6 is a characteristic diagram of an output voltage indicating a zero position of the probe having the configuration of FIG. 5.

  A differential transformer with a position adjusting mechanism and a position adjusting method according to the present invention include a position adjusting mechanism for adjusting a reference position (zero point position) required when a differential transformer is attached to a device. By incorporating it in the inside, it is possible to reduce the size of the whole and facilitate position adjustment.

DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a differential transformer with a position adjusting mechanism and a position adjusting method thereof according to the present invention will be described with reference to the drawings.
In addition, the same code | symbol is attached | subjected and demonstrated to a part the same as that of a prior art example, or an equivalent part.
In FIG. 1, what is shown by the code | symbol 1 is the cylindrical case formed with the nonmagnetic material, The fixed tube body 20 which has the cylindrical extension part 20a is formed in the one end side 1a in the said cylindrical case 1 in FIG. The first O-ring 22 is provided between the fixed tube body 20 and the one end side 1a.

  A cylindrical bobbin 23 having a winding 2 composed of a primary winding (not shown) for performing excitation and a secondary winding for detection is formed on the outer periphery of the cylindrical extension 20a. An elastic body 25 made of a spring or the like is interposed between one end 23a of the cylindrical bobbin 23 and the step portion 24 of the fixed tube body 20 so as to be freely movable along A. The cylindrical bobbin 23 is constantly urged toward the other end 1b of the cylindrical case 1.

  A nut 27 having a cross-sectional cup shape is screwed into the screw portion 26 formed in the opening 14a on the other end side 1b of the cylindrical case 1 so as to be linearly movable along an arrow A direction that is an axial direction. The front end surface 27 a of the nut 27 is in contact with the cylindrical bobbin 23 via a washer 28.

A plurality of concave portions 29 are formed on the tip end surface 27a side of the nut 27, so that the weight of the nut 27 can be reduced.
Further, as shown in FIG. 3, a pair of jig holes 30 are formed in the rear end surface 27b of the nut 27 so as to be separated from each other along the diameter direction B thereof. For example, by inserting a jig having a bifurcated configuration (not shown) into the jig hole 30 and rotating the tool hole 30, the nut 27 can be made freely accessible.
The above-described nut 27, opening 14a, and washer 28 form a position adjustment mechanism 60.

A second O-ring 32 is provided in an annular recess 31 formed on the outer periphery of the nut 27, and the outer surface of the O-ring 32 is in sliding contact with the inner surface 1 c of the cylindrical case 1.
A cylindrical magnetic shield plate 33 is attached to the inner surface 1c of the cylindrical case 1 in a state corresponding to the outer periphery 2a of each winding 2 of the cylindrical bobbin 23 with an adhesive 34. The magnetic shield plate 33 prevents the magnetic flux generated from 2 from leaking out of the cylindrical case 1.

As shown in FIG. 2, the cylindrical case 1 is integrally formed with the fixed tube body 20 from the outside of the one end side 1 a of the cylindrical case 1, as shown in FIG. 2. It is configured.
A guide pin 41 fixed to the fixed tube body 20 and extending along the axial direction A is formed at the one end 23 a of the cylindrical bobbin 23 and is slit 42 extending along the axial direction A. By being engaged inside, the cylindrical bobbin 23 is configured to be prevented from rotating during linear movement.

Next, the case where the differential transformer 50 with a position adjusting mechanism in FIG. 1 is operated in the above-described configuration will be described.
First, the front end 20A of the fixed tube body 20 of the differential transformer with position adjusting mechanism 50 assembled in the state of FIG. 1 is attached to a member to be attached 51 of a counterpart device with a screw or the like (not shown), and the probe 10 is attached. When an inspection device (not shown) is connected to the lead wire 52 in a state of being connected to a detected shaft (not shown) of the counterpart device, and the nut 27 is rotated in a state where an excitation voltage is marked on the winding 2, The cylindrical bobbin 23 moves forward or backward along the axial direction A.

In the foregoing state, by the testing device, wherein a state output voltage Vrms is by the nut 27 until it coincides with the zero position V ₀ adjusted zero position adjustment i.e. home position, which coincides with the zero position V ₀ which Figure 8 of the aforementioned Shipment is possible by fixing the nut 27 to the cylindrical case 1 with a tape (not shown).

The gist of the above-described differential transformer with a position adjusting mechanism and its position adjusting method according to the present invention is as follows.
That is, a fixed tube body 20 fixed to one end side 1a of the cylindrical case 1 and having a cylindrical extension 20a, a probe 10 provided in the cylindrical extension 20a, and an outer periphery of the cylindrical extension 20a. A cylindrical bobbin 23 having a winding 2 that is operably provided, and the cylindrical bobbin 23 provided between the cylindrical bobbin 23 and the step portion 24 of the fixed tube body 20 is connected to the cylindrical case 1. An elastic body 25 for urging to the end side 1b, an opening 14a with a screw portion 26 provided on the other end side 1b of the cylindrical case 1, and the other end side 1b in the cylindrical case 1 A nut 27 which is provided and screwed into the opening 14a; and a washer 28 provided between the cylindrical bobbin 23 and the nut 27, and a position adjusting mechanism by the nut 27, the opening 14a and the washer 28. Forming 60 The cylindrical bobbin 23 is linearly moved by the rotation of the nut 27, and the guide pin 41 provided on the fixed tube body 20 is engaged with the slit 42 of the cylindrical bobbin 23. The cylindrical bobbin 23 is rotated and stopped by the guide pin 41 and the slit 42, and the inner surface 1c of the cylindrical case 1 has a cylindrical magnetic shape. In this configuration, a shield plate 33 is provided to prevent leakage of magnetic flux generated from the winding 2 to the outside of the cylindrical case 1.

  A differential transformer with a position adjusting mechanism and a position adjusting method according to the present invention can move a cylindrical bobbin having a winding provided in a cylindrical case of a differential transformer back and forth along the axial direction by rotating a nut. Therefore, even after the differential transformer is attached to the apparatus, the zero position can be easily adjusted.

DESCRIPTION OF SYMBOLS 1 Cylindrical case 1a One end side 1b The other end side 1c Inner surface 2 Winding 2a Outer periphery 10 Probe 14a Opening 20 Fixed tube body 20A Front end 20a Cylindrical extension part 21 Adhesive 22 1st O-ring 23 Cylindrical bobbin 23a One end 24 Step part 25 Elastic body 26 Threaded portion 27 Nut 27a Front end surface 27b Rear end surface 28 Washer 29 Recessed portion 30 Jig hole 32 Second O-ring 33 Magnetic shield plate 40 Caulking portion 41 Guide pin 42 Slit 50 Differential transformer with position adjusting mechanism 51 Mounted member 52 Lead wire 60 Position adjustment mechanism A Axial direction B Diameter direction

Claims (6)

  A fixed tube body (20) having a cylindrical extension (20a) fixed to one end side (1a) of the cylindrical case (1), and a probe (10) provided in the cylindrical extension (20a); A cylindrical bobbin (23) having a winding (2) operably provided on the outer periphery of the cylindrical extension (20a), and a stepped portion of the cylindrical bobbin (23) and the fixed tube body (20). (24) and an elastic body (25) for urging the cylindrical bobbin (23) toward the other end side (1b) of the cylindrical case (1), and the cylindrical case (1 ) On the other end side (1b) provided with a threaded portion (26a) and on the other end side (1b) in the cylindrical case (1) on the opening (14a). A nut (27) to be screwed, and a washer (28) provided between the cylindrical bobbin (23) and the nut (27), the nut (27), the opening (14a) and The washer (28) forms a position adjusting mechanism (60), and the cylindrical bobbin (23) is moved linearly by the rotation of the nut (27). A differential transformer with a position adjusting mechanism, characterized by being configured to move.   A guide pin (41) provided on the fixed tube body (20) engages with a slit (42) of the cylindrical bobbin (23), and a rotation stop and a linear motion guide of the cylindrical bobbin (23) are provided. The differential transformer with a position adjusting mechanism according to claim 1, wherein the guide pin (41) and the slit (42) are used.   A cylindrical magnetic shield plate (33) is provided on the inner surface (1c) of the cylindrical case (1), and magnetic flux generated from the winding (2) is transferred to the outside of the cylindrical case (1). The differential transformer with a position adjusting mechanism according to claim 1 or 2, wherein leakage is prevented.   A fixed tube body (20) having a cylindrical extension (20a) fixed to one end side (1a) of the cylindrical case (1), and a probe (10) provided in the cylindrical extension (20a); A cylindrical bobbin (23) having a winding (2) operably provided on the outer periphery of the cylindrical extension (20a), and a stepped portion of the cylindrical bobbin (23) and the fixed tube body (20). (24) and an elastic body (25) for urging the cylindrical bobbin (23) toward the other end side (1b) of the cylindrical case (1), and the cylindrical case (1 ) On the other end side (1b) provided with a threaded portion (26a) and on the other end side (1b) in the cylindrical case (1) on the opening (14a). A nut (27) to be screwed, and a washer (28) provided between the cylindrical bobbin (23) and the nut (27), the nut (27), the opening (14a) and The washer (28) forms a position adjusting mechanism (60), and the cylindrical bobbin (23) is moved linearly by the rotation of the nut (27). A position adjusting method for a differential transformer with a position adjusting mechanism, characterized by:   A guide pin (41) provided on the fixed tube body (20) engages with a slit (42) of the cylindrical bobbin (23), and a rotation stop and a linear motion guide of the cylindrical bobbin (23) are provided. 5. The position adjusting method for a differential transformer with a position adjusting mechanism according to claim 4, wherein the position adjusting method is performed by the guide pin (41) and the slit (42).   A cylindrical magnetic shield plate (33) is provided on the inner surface (1c) of the cylindrical case (1), and magnetic flux generated from the winding (2) is transferred to the outside of the cylindrical case (1). 6. The position adjusting method for a differential transformer with a position adjusting mechanism according to claim 4, wherein leakage is prevented.

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