JPH0115918B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention detects a measured quantity, such as temperature, occurring on a rotating body during its operation, and transmits the measured quantity from the rotating body to a receiving device on a stationary side in a non-contact manner. The present invention relates to a measured quantity transmitting device, and particularly to improvements in the assembly structure of electronic component printed circuits constituting the electronic circuit of the transmitting device.

In the synthetic fiber industry, a metal roller, generally called a roll heater, is used in the process of drawing or heat treating yarn, and is heated by, for example, an induction heating type heater and driven to rotate at high speed by a motor.

In this case, in order to obtain high quality yarn, it is necessary that the surface temperature of the roll heater is always controlled to an appropriate value. In order to do this, it is necessary to accurately detect the surface temperature of the metal roller and send the measured amount to the heater control device, and the means to do this is to connect the temperature sensor directly to the metal roller, which is a rotating body, without separating it from the metal roller. A method has been adopted in which the output of the temperature sensor is transmitted to the heater control device on the fixed side. However, the method of transmitting the above-mentioned signals between the rotating body and the stationary side via brushes, slip rings, etc. is extremely difficult and practical because it is extremely difficult to extract the signals to the stationary side with high precision and stability over a long period of time. Generally, the contactless signal transmission method described below is adopted.

That is, a transmitting section that converts the output of the temperature sensor into a certain predetermined transmitting signal and transmitting the signal is installed on the rotating body side, and the signal is sent and received in a non-contact manner with a receiving section provided on the stationary side. In addition, this type of transmission means converts the temperature into the resistance value of a resistance thermometer, which is a temperature sensor, detects this at the Vienna Bridge, converts it into a frequency, and transmits it to the stationary side via a rotating transformer. There are also methods in which the resistance value of the temperature sensor is amplified, FM modulated through a modulation circuit, and transmitted to the fixed side through a transmitting circuit and antenna, or a method in which the output of the temperature sensor is converted to a frequency and then transmitted through an electro-optical conversion circuit to an optical signal. A method is known in which the light is transmitted optically between a light emitting element and a light receiving element instead of a signal.

FIGS. 1 and 2 show the basic circuit of a temperature transmitting device that transmits a signal using an optical signal, which is particularly advantageous among the above methods, and the schematic configuration of a roll heater equipped with the temperature transmitting device. . First, in FIG. 1, reference numeral 1 is a temperature transmitter installed on the rotating body side of the roll heater, and the output of the temperature sensor 2 is transmitted through a voltage conversion circuit 3, an amplification circuit 4, a voltage-frequency converter 5, and a lighting circuit 6. The light is given to the light emitting element 7, which is a signal transmitter, and is transmitted as an optical signal. Note that power is supplied to the above circuit from the fixed side through the secondary coil 8 of the power supply rotating transformer, the rectifier circuit 9, and the constant voltage circuit 10. On the other hand, the receiving section 1 on the fixed side
1, a light receiving element 12 installed with its optical axis aligned with the light emitting element 7 receives an optical signal, converts the optical signal into an electrical signal through a conversion circuit 13, and outputs the electrical signal to a subsequent heater control circuit. Note that 14 is a primary coil of a rotating transformer installed on the stationary side. A roll heater equipped with the temperature transmitting device described above is constructed as shown in FIG. A metal roller 18 heated by a fixed heater 17 is attached to one end of the rotating shaft 16 of the drive motor 15, and the above-mentioned temperature sensor 2 is embedded therein. The aforementioned transmitter 1 is attached to the other end of the rotating shaft 16, and the sensor temperature 2
and are interconnected by a lead wire 19 through a shaft hole drilled in the center of the rotating shaft 16. Also, the receiving section 1
1. The primary coil 14 of the rotating transformer and the like are supported by a frame extending laterally from the casing of the motor 15. As the temperature sensor, it is also possible to use other temperature sensing elements such as a thermistor or a thermocouple in addition to the above-mentioned resistance temperature detector.

By the way, the signal conversion circuits of the transmitting device indicated by numerals 3 to 6 in FIG. 1 usually include ICs or miniature capacitors, resistors, transistors,
It is constructed as a printed circuit with electronic components such as diodes mounted on a printed board. Such electronic circuit components are mechanically extremely weak because individual components and elements are soldered to a printed board with extremely thin lead wires. For this reason, if an external force is applied from an inappropriate direction, lead wires and the like may easily break, damaging electronic components and elements, and great care must be taken when handling them. On the other hand, since the roll heater is rotated at high speed during operation, the electronic circuit components assembled and loaded on the rotating body side of the roll heater are inevitably subjected to a considerable centrifugal load. From this point of view, countermeasures against centrifugal loads on electronic circuit components are extremely important issues, and from this point of view, several attempts have been made to assemble structures for electronic circuit components installed in high-speed rotating bodies, but none of them have been tested using actual machines. As a result, circuit components and elements are damaged due to the centrifugal load caused by high-speed rotation.
It was not practical. Attempts have also been made to improve the strength of printed circuits by molding them with plastic, but this has the disadvantage that the printed circuits cannot be inspected or parts replaced.

The present invention has been made in consideration of the above points, and its purpose is to sufficiently withstand centrifugal loads without causing undue damage to circuit components and elements due to centrifugal loads caused by high-speed rotation of a rotating body. is possible,
Moreover, it is an object of the present invention to provide a measurement quantity transmitting device for a rotating body that is simple in structure and easy to assemble, and is excellent in terms of reliability and manufacture.

According to the present invention, the electronic components of the printed circuit constituting the signal conversion circuit of the transmitting section are divided into a plurality of printed boards, and the electronic components of the printed circuit are mounted almost in close contact with the mounting surfaces of the boards, and the mounting surfaces are directed toward the inner circumferential side. This is achieved by arranging and distributing each printed circuit board around the printed circuit mounting base, and constructing and fixing the printed circuit boards so as to span between the collars of the mounting base.

The configuration of the present invention will be explained in detail below based on illustrated embodiments.

In FIGS. 3 to 8, first, the transmitter 1 attached to the rotating shaft 16 of the drive motor is roughly divided into a printed circuit mount 20 and a light emitting element mount 30.
, a protective cover 40, a printed circuit 50 constituting a signal conversion circuit mounted on the printed circuit mounting base 20, a light emitting element 7 as a transmitter mounted on the mounting base 30, and a secondary side of a power supply rotating transformer. It is constructed by combining a coil 8 and a core 81 assembly with each other. Among these, the printed circuit mounting base 20 is made, for example, as an aluminum molded product, and its structure includes a boss portion 21 that fits into the rotating shaft 16, and a diameter provided at two locations at the axial end and intermediate position of the boss portion. It is a bobbin-shaped body having two large ribs 22 and 23. Further, a boss portion 21' of the boss portion 21 extending to the left side of the flange portion 23 is used as a support boss for the rotary transformer. The outer peripheral surface of the flange portions 22 and 23 of the mounting base 20 serves as a mounting seat for a printed board, which will be described later.
It is cut into a polygon (regular hexagon in the illustrated example) according to the number of printed boards. Further, on the circumferential surface of the intermediate flange portion 23, radial through screw holes 24 are bored at two locations at the apex portions of the polygon.
The mounting base 20 is firmly fixed to the rotating shaft 16 by a set screw 25 through this screw hole 24. In addition, in order to facilitate the machining of the screw hole 24, the flange portion 2 is
The apex corner of No. 3 is chamfered to form a flat surface. Further, the boss portion 21' of the mounting base 20 has a ring-shaped core 8 around which the secondary coil 8 of the rotating transformer is wound.
1 is inset and supported.

On the other hand, the light emitting element mounting base 30 is made of an insulator,
A mounting bolt 31 with a screw hole in the bolt head
(Fig. 4) through the collar 22 of the mounting base 20.
It is removably attached to the end face of the Its structure includes a disk-shaped base plate 33 with a lead wire through hole 32 in the center, and a mounting base part 34 that projects axially from the plate surface of the base plate 33 and is integrally molded and extends in the diametrical direction. In addition, a light emitting element 7 is located at a location on the mounting base portion 34 that coincides with the axis center of the rotating shaft 16.
is installed in a snap-in manner with the optical axis aligned with the center of the axis. Furthermore, this mounting base 30 also serves as a terminal block,
A side surface of the mounting base portion 34 is provided with a connection terminal 35 for relay connection of the connection lead wire 19 from the temperature sensor during assembly. Note that 36 is a lead wire passage hole that is connected to the inner space of the bobbin-shaped printed circuit mounting base 20 described above. The screw operation direction of the connection terminal 35 is oriented in the circumferential direction. Furthermore, if the lead wire is oriented in the direction of rotation of the shaft, it will not come off due to centrifugal force.

The protective cover 40 is made up of a combination of a cylindrical cover 41 that surrounds the outer periphery of the printed circuit mounting base 20 and a dish-shaped cover 42 that surrounds the light emitting element mounting base 30 from the axial direction. Among them, the cylindrical cover 41 has one end fitted into and supported by a stepped part formed on the shoulder of the core 81 of the rotary transformer described above, and the other end engaged with the dish-shaped cover 42 and The shaped cover 42 is fixed by being screwed into a screw hole formed in the bolt head of the mounting bolt 31 of the mounting base 30 described above through the mounting bolt 43. Moreover, the cover 41 is attached to the circumferential surface of the cylindrical cover 41 when it is assembled into the mounting base 20.
A driver insertion hole 44 is provided so that the set screw 25 of the mounting base 20 can be operated from the outside. Further, the dish-shaped cover 42 has cutout windows 45 cut out at both left and right ends, and is devised so that the inner lead wire connection state can be visually observed from the outside through the cutout windows 45. Furthermore, when connecting terminals, etc., only the dish-shaped cover can be removed through the gap between the light receiving and light emitting elements.

Next, the configuration of the printed circuit 50, which is the main part of the present invention, and its mounting structure will be described. First of all
The electronic components constituting the printed circuit 50 of the signal conversion circuit described in the figure are divided into a plurality of rectangular printed boards 52 (six in the illustrated example) as shown by reference numeral 51, and mounted on one side of each printed board 52. Each is mounted closely on the surface. Each of the printed circuit boards 52 is arranged so as to be distributed around the aforementioned printed circuit mounting base 20 with the mounting surface of the electronic component 51 facing the inner periphery, and straddles the mounting seating surfaces of the polygonal ribs 22 and 23. Each is fixedly supported by bolts 53 from the radial direction. In this attached state, the electronic component 51 is stored in a space surrounded by the boss portion 21 and the collar portions 22 and 23. In this case, printed board 5
2 blocks the screw hole 24 for the set screw that fixes the mounting base 20 to the rotating shaft 16, the corner of the printed board 52 is cut diagonally to allow the screw hole 24 to escape. The shape allows sufficient space for the screw holes 24 to be secured between adjacent printed boards. Furthermore, in order to reinforce the strength of the printed boards 52 against centrifugal loads when mounted on the mounting base 20, each printed board 52 is tightly bound together with a binder 54 wrapped around the outer periphery. As the binder 54, an insulating thread, tape, or the like is used. In some cases, the printed board 52 may be fixed and supported only by the binder 54, and the bolts 53 may be omitted. In this case, in order to prevent the printed board 52 from shifting, grooves are formed in the collars 22 and 23 of the mounting base 20 in which each printed board fits into a predetermined position, and the bottom of this groove is connected to the printed board mounting seat. It is better to fit and hold the printed board from the outer periphery. Furthermore, as a means for holding the printed board 52 against centrifugal loads, it is also possible to interpose a suitable spacer or the like on the inner peripheral surface of the above-mentioned protective cover 40 instead of the binder 54 to hold the printed board 52 from the outer periphery.

Returning to the above-mentioned protective cover 40, the diameter of the cylindrical cover 41 of the protective cover 40 is adjusted to be slightly larger than the outer diameter of the assembly of the mounting base 20 and printed board 52. stipulated. By selecting such a diameter dimension, even if the set screw 53 of the printed board 52 should become loose during rotation, the set screw 53 will hit the inner surface of the cylindrical cover 41 and will not come off.

Next, a method of wiring interconnection lead wires in the transmitting section 1 having the above configuration will be described. A lead wire 19 drawn out from a temperature sensor (not shown) passes through the center hole of the motor rotating shaft 16, and is further connected to the connection terminal 35 through the lead wire through hole 32 of the mounting base 30, using the connection terminal as a relay point. connected to the printed circuit. Note that the connection lead wires connecting the connection terminal 35 and the printed circuit, and the printed circuit and the light emitting element 7, are routed through the lead wire through hole 36 of the mounting base 30, as shown in FIG. Further, the lead wires connecting the printed boards 52 to each other are particularly wired on the same side of the printed board 52 as the electronic component mounting surface, as shown by reference numeral 55 in FIG. With this wiring structure, there is no fear that the connecting lead wire 55 between the printed boards will fall off from the printed boards even under centrifugal load.

Next, FIG. 8 shows the assembly structure of the entire transmitting device.
A receiving unit 1 is provided on the fixed side opposite to the transmitting unit 1 described above.
1 is supported by a bracket of a drive motor 15 via a support arm 60 and a flange 61, and a light receiving element 12 is installed in the receiving part 11 with its optical axis aligned with the light emitting element 7 of the transmitting part 1. Further, an assembly of a primary coil 14 facing the secondary coil 8 of the rotary transformer and a ring-shaped core 141 surrounding the primary coil is fitted into the flange 61 and secured with screws. Note that the axial dimension of the flange 61 is, of course, the same as that of the mounting base 2 in the transmitter 1.
This setting is made so that the operation of the set screw 25 of No. 0 will not be hindered. Furthermore, the transmitting section 1 and the receiving section 11 are covered by a dustproof cover 62 which is screwed and supported on the flange 61. Reference numerals 63 and 64 are the primary side lead wires of the power supply rotary transformer drawn out and the output lead wires of the receiving section 11, respectively.

According to the above-mentioned measured quantity transmitting device of the present invention, the printed circuit consisting of a combination of electronic components in the transmitting section installed on the rotating body is mounted such that the electronic components are divided into a plurality of printed boards and are mounted in close contact with the mounting surfaces thereof. The printed circuit boards are evenly arranged and fixedly supported on the outer circumference of the printed circuit mounting base with the mounting surface facing the inner circumference in a well-balanced manner. Therefore, due to this clever configuration, all the centrifugal loads generated by the high-speed rotation of the rotating body act in the direction of pressing the electronic components against the printed circuit board, and the lead wires and leads of mechanically weak electronic components are An unreasonable load that would damage the wires and the printed board is not applied to the soldered parts, and the resistance against centrifugal loads can be greatly improved. In addition, each printed board is arranged concentrically around the rotational axis of the rotating body, and the rotation radius can be configured to be small, so there is almost no unbalanced load on the rotating body, especially the drive motor. Therefore, smooth high-speed operation can be expected. In addition, according to the present invention, detailed ideas and considerations have been made to the support structure of the printed circuit board, the structure of the light emitting element mounting base, the support structure of the rotary transformer, the structure of the protective cover, etc., and as a result, the transmitting device as a whole is improved. It is possible to obtain excellent effects such as improved reliability, ease of assembly, and ease of handling.

In the illustrated embodiment, an optical signal transmission method using a light emitting element as a signal transmitter has been described. It is also possible to send and receive signals. In addition, the various quantities detected on the rotating body are not limited to only temperature, but also the measurement of other physical and chemical quantities, as well as electrical quantities such as the current and voltage of the rotor in a rotating electric machine. Of course, it can also be applied as a quantity transmitting device.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram showing the principle of the temperature transmitting device, Fig. 2 is a schematic diagram of the configuration of a roll heater equipped with the temperature transmitting device, and Figs. 3 to 8 show the structure of an embodiment of the present invention. Figure 3 is an upper half cross-sectional side view showing the transmitter with the protective cover removed;
4 is an end view of FIG. 3, FIG. 5 is a sectional view taken in the direction of the arrow in FIG. 3, FIG. 6 is a side view with the protective cover covered, and FIG. 7 is an end view of FIG. 6. 8th
The figure is an assembled view of the entire device, with a portion cut away. 1...Rotation side transmitter, 2...Sensor, 3 to 6
. . . Signal conversion circuit, 7 . Primary coil, 15...
... Drive motor, 16 ... Rotating shaft, 18 ... Roll heater as a rotating body, 20 ... Printed circuit mounting base, 22, 23 ... Flange portion, 25 ... Set screw, 30 ... Light emitting element mounting base, 40...protective cover, 50...printed circuit, 51...electronic component,
52...Printed board, 53...Printed board mounting bolt.

Claims (1)

[Scope of Claims] 1. A sensor for detecting various quantities occurring in a rotating body, a signal conversion circuit for converting the output of the sensor into a transmission signal and transmitting the signal to a receiving section on a stationary side in a non-contact manner;
A signal transmitter provided on the rotating side together with the rotating body, a plurality of printed boards provided to mount electronic components of a printed circuit constituting the signal conversion circuit, and 2 serving as a mounting seat for the printed board. In the measuring quantity transmitting device for a rotating body, which includes a printed circuit mounting base in the form of a bobbin having a striped collar and mounted on the rotating shaft of the rotating body, the electronic component is almost attached to the mounting surface of the printed board. The printed circuit boards are mounted in close contact with each other, and each of the printed circuit boards is arranged and distributed around the peripheral area of the printed circuit mounting base with its mounting surface facing inward, and is constructed and fixed across the collar of the mounting base. A measurement quantity transmitting device for a rotating body characterized by the following. 2. In the measured quantity transmitting device as set forth in claim 1, the printed circuit mounting base includes a boss for supporting an assembly of a secondary coil and a core of a power supply rotary transformer arranged side by side in the axial direction. A measuring quantity transmitting device for a rotating body, characterized in that it is integrally configured. 3. In the measured quantity transmitting device according to claim 1, the signal transmitter is a light emitting element, and the light emitting element is removably attached to the axial end of the printed circuit mounting base. A measurement quantity transmitting device for a rotating body, characterized in that the device is mounted with an optical axis aligned with the center of the axis of the rotating body. 4. A rotating body in the measured quantity transmitting device according to claim 1, characterized in that the assembly of the printed circuit mounting base and the printed board is equipped with a protective cover that surrounds the assembly. Measured quantity transmitter. 5. The measured quantity transmitting device according to claim 1, wherein each printed board is individually fixed by bolting to the collar of a printed circuit mounting base. Device. 6. In the measured quantity transmitting device according to claim 1 or 5, each printed circuit board disposed around the printed circuit mounting base has a binder wrapped around the outer periphery of each printed circuit board. A measured quantity transmitting device for a rotating body, characterized in that they are integrally bound to each other via a rotating body. 7. In the measured quantity transmitting device according to any one of claims 1 and 2, the printed circuit mounting base is located between adjacent printed boards, and the through screw hole is formed in the outer peripheral surface of the collar. Alternatively, a measurement quantity transmitting device for a rotating body, characterized in that it is screwed or pinned to the rotating shaft of the rotating body through a pin hole or the like. 8. The measured quantity transmitting device according to claim 1, characterized in that the lead wires connecting each printed board are wired on the mounting surface side of the printed board like the electronic components. Measuring quantity transmitter for rotating bodies. 9. The measured quantity transmitting device according to claim 3, wherein the light emitting element mounting base is provided with a relay connection terminal for a crossover connection lead wire that connects the sensor and the printed circuit. Body measurement quantity transmitter. 10 In the measured quantity transmitting device according to claim 4, the protective cover has a diameter that is approximately close to the outer diameter of the assembly of the printed circuit mounting base and the printed board, and has a circumferential surface. A measuring quantity of a rotating body, characterized in that a screwdriver insertion hole for operating the set screw from the outside is formed on the top, facing the set screw for fixing the printed circuit mounting base to the rotating shaft of the rotating body. Transmitting device. 11. In the measured quantity transmitting device according to any one of claims 1, 2, and 7,
A measured quantity transmitting device for a rotating body, characterized in that the collar of the printed circuit mounting base is formed into a polygonal shape corresponding to the number of printed boards with each side serving as a printed board mounting seat.