JPH04297999A - Feeding method for inductive feed type telemeter - Google Patents

Abstract

PURPOSE:To easily set the coupling coil of an inductive feed type telemeter with a high coupling efficiency and a high fixing strength. CONSTITUTION:A primary coil 31 is set at a prescribed length apart from the surface of a fixed structure body, and an insulating material 6 is stuck to the secondary coil coupling part on the surface of a movable structure body 1 with a prescribed thickness, and a secondary coil 32 is fixed to the surface of the insulating material. The insulating material 6 having a rugged section is fixed to the surface of the movable structure body 1 by wiring, and the rugged face of another insulating material having the same form is fitted and adhered to that of the insulating material 6, and the secondary coil 32 is fixed to the surface of another insulating material by wiring.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention is an induction power telemeter used to detect information on movable structures without contact, such as detecting torque from the rotating shaft of an engine output or the rotating part of a transmission mechanism. The present invention relates to a power feeding method for an inductively fed telemeter, and particularly to a power feeding method for an inductively fed telemeter that can be implemented using simple means and has excellent coupling efficiency.

0002

[Prior Art] Conventionally, induction-feed telemeters have been used to detect information from movable structures such as the rotating shaft of engine output or the rotating parts of transmission mechanisms. To measure shaft torque, it is used as shown in Fig. 4.

In FIG. 4, reference numeral 50 indicates a part of the structure of a transmission for a construction machine, in which 51 is a high gear section, 52 is a low gear section, 53 is a third gear section, 54 is a fourth gear section, and 55 is a high gear section.
is the back gear part.

Further, 11 is an outer casing of the transmission, 10 is an intermediate shaft of the transmission, and 20 is a bridge-connected strain gauge attached to measure the amount of twist of the intermediate shaft 10. , 21 is a transmitter including various electronic circuits of an inductively fed telemeter to be described later.

The transmitter 21 of the induction power telemeter is connected to a secondary coil 32 disposed on a predetermined rotating body 1 connected to the intermediate shaft 10, and the outer casing, which is a fixed body, faces the secondary coil. A primary coil 31 is disposed at a predetermined location 12 that forms a coupling structure with 11, and a cable from the primary coil includes various electronic circuits of the inductively fed telemeter provided outside the outer casing 11 via a transmission cable 33. Connected to external circuitry (not shown).

In FIG. 5, which is a block circuit diagram showing a general configuration of an inductively fed telemeter, 20 is a sensor such as a bridge-coupled strain gauge for detecting information from a movable structure, and 21 is a transmitter including various electronic circuits. 22 is a voltage conversion circuit that converts the high frequency power received by the coupling coil 30 into DC power for driving the measurement circuit and power supply current for the sensor, and 23 is a voltage conversion circuit that amplifies the signal obtained from the sensor and modulates it as a transmission signal. FM modulation circuit,
24 is an output circuit that connects the FM signal to the secondary coil 32 of the coupling coil 30, and 25 is a capacitor that cuts off the high frequency power and couples the FM signal to the secondary coil 32.

Further, 34 is an intermediate coupling circuit, and 34 is an intermediate coupling circuit.
Reference numeral 6 denotes a high frequency power oscillator, and the oscillated high frequency power is supplied from the coupling transformer 35 to the primary coil 31 of the coupling coil 30 via the transmission cable 33, and the magnetic field created by the primary coil is detected by the secondary coil 32. , as described above, is utilized as the power necessary for each circuit of the transmitter 21.

As described above, the FM modulated signal supplied to the secondary coil 32 is received by the primary coil 31, and is separated from the power high frequency signal and transmitted by the FM signal coupling transformer 37 which separates and detects the FM signal. The FM modulated signal is transmitted by a cable 40 to a receiver 41 containing various electronic circuits for detecting information about the movable structure. In the receiver 41, the F transmitted from the transmission cable 40
The M signal is demodulated by the demodulation circuit 43, the original signal is extracted by the information processing circuit 44 and displayed on the display device 45, and
The data is taken out from the output terminal 47 and recorded on, for example, an externally connected recording device.

Further, 42 is a rectifier circuit that converts commercial power from an AC power source 46 into DC power used in each circuit.

[0010] In the above-mentioned inductively fed telemeter,
The installation state of the coupling coil 30 used for information and power transmission between the fixed structure and the movable structure will be explained with reference to FIG.

In FIG. 6, which shows a situation in which the inductively fed telemeter described above with reference to FIG. 5 is mounted on a rotating electric machine as explained with reference to FIG. (hereinafter referred to as the rotation axis). The primary coil 31 is attached to the fixed structure 12 connected to the housing 11 using a mounting member 9 using, for example, a bolt.
is fixed. The primary coil 31 is connected to an electronic circuit not shown in this figure by a transmission cable 33 for connection.

A rotating body 1, which is a movable structure, is coupled to the rotating shaft 10, and a secondary coil 32 is attached to the rotating body 1.

The secondary coil 32 attached to the rotating shaft 10 is
For example, a groove with a width of 6 mm and a depth of 5 mm is formed on the outer periphery of a rotating body with an insulating tape pasted inside, and an enameled wire of a predetermined diameter is wound 10 turns inside as a secondary coil, and then insulated. It was constructed by wrapping tape around it and then tightening and fixing it to the rotating body 1 using octopus thread.

The primary coil 31 mounted on the fixed structure 12 and the secondary coil 32 mounted on the rotating body 1 are arranged at mutually corresponding positions as shown in the figure.

[0015]

[Problems to be Solved by the Invention] However, the coupling efficiency of the above-mentioned conventional coupling coil 30 is limited because the secondary coil 32 is surrounded by the moving structure 1 etc. made of metal that is an electrical conductor. Therefore, there was a problem in that the electromagnetic field of the coupling coil was absorbed by the surrounding members and decreased significantly, making it impossible to supply the necessary power.
Inductively fed telemeters must be installed and measured in accordance with the predetermined conditions of the already manufactured mechanical structure.

[0016] For this reason, the number of turns and shape of the coil must be adjusted for each object to be measured, and there is a problem in that measurement is sometimes difficult.

[0017] Furthermore, there are cases where it is not possible to provide a groove in the movable structure, and as mentioned above, the movable structure is a rotating body and rotates at high speed, so that it is difficult to counter the centrifugal force generated when the movable structure is a rotating body. There was a problem in that it was difficult to fix.

[0018] The present invention solves the above conventional problems, and
Our objective is to provide an inductively powered telemeter that is easy to install, has high measurement efficiency, and has high fixing strength.

[0019]

[Means for Solving the Problems] The present invention supplies power from a fixed structure to a movable structure by electromagnetic coupling between a primary coil provided on a fixed structure and a secondary coil provided on a movable structure. In an induction-fed telemeter that transmits detection signals in reverse, the primary coil is mounted a predetermined distance from the surface of a fixed structure, and an insulator is fixed to a predetermined thickness at the secondary coil coupling part on the surface of the movable structure. It is characterized by a secondary coil fixed to the surface of the object.

[0020] Furthermore, in order to fix an insulator to a predetermined thickness on the surface of the movable structure where the secondary coil is connected, and to fix the secondary coil to the surface of the insulator, one side of the cross section must be flat and face each other. An elastic insulator with an uneven surface on one side is fixed to the surface of a movable structure with wire, etc., with the flat surface inside.
An insulator having the same shape as the insulator is fitted and bonded to the insulator, a secondary coil is formed on the surface of the insulator, and the secondary coil is attached to the insulator with a wire or the like. I fixed it.

[0021]

[Operation] As mentioned above, the primary coil is mounted at a predetermined distance from the surface of the fixed structure, and an insulator is fixed to a predetermined thickness at the secondary coil connection part on the surface of the movable structure, and the insulator is attached to the surface of the insulator. To fix the secondary coil and fix the insulator to the surface of the insulator, use an elastic insulator whose cross section is flat on one side and uneven on the opposite side. The movable structure is fixed to the surface of the movable structure with a wire or the like with the flat surface inside, and the unevenness of the insulator having the same shape as the insulator is fitted and adhered to the unevenness of the insulator, and the formed insulator surface is covered with a secondary material. Since a coil is formed and the secondary coil is fixed to the insulator with a wire or the like, it is possible to secure the necessary voltage in the movable structure regardless of the shapes and dimensions of the fixed structure and the rotating body. Ta.

[0022] Furthermore, processing such as providing grooves in the movable structure is no longer necessary.

Furthermore, the secondary coil can now be reliably fixed even when the movable structure rotates at high speed.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment in which the present invention is applied to shaft torque measurement in a transmission of a construction machine described in the prior art will be described with reference to FIGS. 1 to 3. That is, the structure of the transmission of the construction machine to which the present invention is applied and the configuration of the induction power telemeter are the same as those shown in FIGS. ing.

FIG. 1 shows a situation in which the induction feeding telemeter described above with reference to FIGS. 4 and 5 is mounted on a rotating body of a transmission. In FIG. 1, 11 is an outer casing of a transmission which is a fixed structure, and 12 is a fixed structure (hereinafter referred to as a fixed body) mechanically coupled to the outer casing 11. Also,
10 indicates the rotation axis of the transmission. A primary coil 31 is fixed to the fixed part 12 via a member 9, and the primary coil 31 is connected to an electronic circuit (not shown in this figure) by a transmission cable 33 for connection.

In order to fix the primary coil 31 to the above-mentioned fixing part 12 via the member 9, for example, it is manufactured by the following means and mounted at a predetermined position. ■Make a round brass rod with a diameter of 4 mm into a ring with a diameter of 540 mm with the ends separated by about 20 mm. (2) Cut Teflon tubes having an inner diameter of 4 mm and an outer diameter of 4 mm into lengths of 20 mm, and fit 12 of them into the ring at equal intervals. (2) Connect a shielded wire as a transmission cable to the end of the ring to form the primary coil 31. ■
Approximately 30 mm from the surface of the fixed body to which the primary coil is attached.
A hexagonal bolt is embedded as the member 9 in a predetermined position of the fixed body so that its head is placed at a distant position. (2) Fix the ring to the head of the hexagonal bolt via the Teflon tube with a wire having a predetermined diameter.

[0027] Also, a rotating body (hereinafter referred to as a rotating body) 1 which is a movable structure connected to the rotating shaft 10 by a spline.
A secondary coil 32 is attached via an insulator 6 as will be described in detail later.

FIG. 2 is a structural diagram illustrating a means for attaching the secondary coil 32 to the rotating body 1 via the insulator 6, and FIG.
2 shows a cross section of the 6th part of the insulator in FIG.

In FIG. 2, 1 is a rotating body, 6 is an insulator for mounting the secondary coil 32 floating from the rotating body 1, and 8 is a wire for fixing the secondary coil 32 to the insulator 6. be.

In FIG. 3, 1 is a rotating body, and 4 is a V-belt with a width of 15 mm, for example, which is cut to match the outer diameter of the rotating body 1 and wrapped around the rotating body. As a result, the groove portion of the V-belt is tightened to the rotating body.

Reference numeral 3 denotes a V-belt having the same dimensions as the V-belt 4, which is bonded to face the V-belt 4 so that its unevenness is reversed. Therefore, the V belt 3
The outer diameter surface of forms a flat circular surface.

That is, the insulator 6 is connected to the two V-belts 3,
It is composed of 4.

[0033] The secondary coil 32 has a diameter of 0.3 m, for example.
The structure is constructed by winding 5 turns of m enameled wire around the insulator 6, and taping the top with an insulating tape 7.

Reference numeral 8 denotes, for example, 30 enameled wires with a diameter of 0.3 mm, which are inserted and fixed at equal intervals when the V-belt is fixed with the piano wire 5. After configuring and tightening the secondary coil 32
to be fixed.

Since the primary coil and the secondary coil are constructed as described above, even if the distance between the primary coil and the secondary coil is about 10 mm due to the shape and dimensions of the fixed body and the rotating body, the sensor circuit will not need to be used. It became possible to secure the applied voltage.

Furthermore, since the secondary coil is constructed as described above, the circumferential speed due to rotation at the attachment part of the secondary coil to the rotating body is, for example, 76 m/s, and therefore, 2
Even when subjected to a centrifugal force of 500G, the secondary coil is securely fixed without disassembling and detaching.

[0037]

[Effects of the Invention] According to the present invention, the primary coil is mounted at a predetermined distance from the surface of the fixed structure, and an insulator is fixed to a predetermined thickness at the secondary coil coupling portion on the surface of the movable structure. Since the secondary coil is fixed on the surface of the insulator, it is possible to secure the necessary voltage in the movable structure regardless of the shape and dimensions of the fixed structure and the rotating body, and the movable structure can rotate at high speed. Even in such a case, an excellent effect was obtained in that the secondary coil could be securely fixed without processing such as providing a groove in the movable structure. In addition, in order to fix the secondary coil on the surface of the insulator by fixing the above-mentioned insulator, it is necessary to attach an elastic insulator whose cross section is flat on one side and uneven on the other side to the surface of the movable structure. fixed with a wire or the like with the flat surface inside, and fitting and bonding irregularities of an insulator having the same shape as the insulator to the irregularities of the insulator, forming a secondary coil on the surface of the formed insulator, Since the secondary coil is fixed to the insulating material with a wire or the like, an insulating layer can be constructed on the surface of the movable structure without processing and manufacturing a special member, and the secondary coil can be fixed on the surface. An excellent effect was obtained.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram for explaining the present embodiment, showing a situation in which an induction feeding type telemeter is attached to a rotating body (movable structure) of a transmission.

FIG. 2 is a schematic structural diagram illustrating means for attaching the secondary coil in FIG. 1 to a rotating body (movable structure) via an insulator.

FIG. 3 is a cross-sectional structural diagram illustrating a configuration in which the secondary coil in FIG. 2 is attached to a rotating body (movable structure) via an insulator.

FIG. 4 is a structural diagram showing a part of a transmission of a construction machine, illustrating an example of use of an induction power feeding telemeter.

FIG. 5 is a schematic block circuit diagram of an inductively fed telemeter.

FIG. 6 is a conventional schematic configuration diagram showing a situation in which an induction feeding telemeter is attached to a rotating body (movable structure) of a transmission.

[Explanation of symbols]

1 Rotating body (movable structure) 6 Insulator 12 Fixed body (fixed structure) 31 Primary coil 32 Secondary coil

Claims (2)

[Claims] Claim 1: Inductive power feeding in which power is supplied from the fixed structure through electromagnetic coupling between a primary coil provided on the fixed structure and a secondary coil provided on the movable structure, and a detection signal is sent back from the movable structure. In a type telemeter, the primary coil is mounted a predetermined distance from the surface of the fixed structure, an insulator is fixed to a predetermined thickness at the secondary coil coupling part on the surface of the movable structure, and the secondary coil is fixed to the surface of the insulator. A power feeding method for an inductively fed telemeter characterized by the following. [Claim 2] An elastic insulating material whose cross section is flat on one side and uneven on the other side is fixed to the surface of the movable structure with a wire or the like with the flat side inside, and the insulating material has the same shape as the insulating material. A feature is that the unevenness of an insulator is fitted and adhered to the unevenness of the insulator, a secondary coil is formed on the surface of the formed insulator, and the secondary coil is fixed to the insulator with a wire or the like. A method of feeding power to an inductively fed telemeter according to claim 1.