KR19980050810A - Cam switch automatic drive device - Google Patents

Abstract

The present invention is a cam switch driving device for driving the cam switch by an electric motor so that the cam shaft is not stopped at the intermediate position between the opening and closing of the contact. The device comprises a drive shaft coupled with the cam shaft to rotate the cam shaft, a disk coupled to rotate integrally with the drive shaft and having a long hole in the circumferential direction, and a pin inserted into the long hole of the disk and rotating the disc in the left and right portions of the long hole. And a first gear integrally coupled, a second gear meshed with the first gear, and a rotation force generating means for rotating the second gear.

The control circuit for driving the apparatus includes a motor having a rotational force for rotating the camshaft, a relay having a contact connecting the power supply and the motor to apply a driving voltage to the motor, and an operating voltage through the optical sense of the relay. A first power supply circuit for applying a power supply; a second power supply circuit for applying an operating voltage to the relay through a cam switch; and a remote control switch for applying a remote control signal to a corresponding terminal of the cam switch. Is done.

Description

Cam switch automatic drive device

1 is an assembled cross-sectional view of the cam switch automatic drive device of the present invention

2 is a cross-sectional view taken along the line II-II of FIG.

Figure 3 is a circuit diagram of the cam switch automatic drive device of the present invention

4 is a diagram showing a relationship between a disk and a first gear in order to explain the operating principle of the present invention.

* Explanation of symbols for main parts of the drawings

DESCRIPTION OF SYMBOLS 1 Front panel 2 Rear panel 3 Front bracket 4 Rear bracket

5 disk 6 drive shaft 7 support rod 8 pin

9: Fixed Key 10: Spring 11: First Gear 12: Second Gear

13,14: cover plate 15: circuit board 16: substrate support

17: index plate 18: index pin 19: snap ring

20,20 ': Ball 21,33: Bolt 41: Contacts

42: cam device 43: cam shaft 44: micro switch

45: handle 51: cam 52: cam fixing roller 54: long hole

The present invention relates to a cam switch automatic driving device, and more particularly, to a cam switch automatic driving device that facilitates automatic operation when the cam switch is remotely operated.

The cam switch is a switch used to open or close a plurality of electrical wires at the same time, and is mainly used in power plants, substations, and general electric workpieces. The cam switch is configured such that a plurality of teeth are turned on or off depending on the rotation angle of the switch shaft (camshaft) to which the handle is attached.

Conventional cam switches have a cam (51: see FIG. 4) and a cam fixing roller (52: see FIG. 4) coupled to the camshaft in order to contact or prevent a plurality of contacts 41 from each other on the right side of FIG. It has a cam device combined with. The handle is attached to the camshaft of the cam device (usually formed by a square rod) so that the operator can turn the handle.

The camshaft is rotated in steps by a fixed interval of 30 degrees, 45 degrees, 60 degrees, 90 degrees, and so on. For example, in the case of a 30 degrees cam switch, the cam shaft stops at a fixed position at 30 degrees intervals. . Therefore, the cam shaft is rotated to a position not exceeding 15 degrees by turning the knob, and then returned to its original position, and the cam shaft is rotated above 15 degrees and then rotated by 30 degrees even if it is released without further turning. . The reason for doing this is to ensure that when the contacts are attached to or detached from each other by the camshaft, the state of opening and closing is closed when the contact is open and closed. It is for. If it stays in an intermediate state, an electric arc is generated, which causes problems such as a dirty contact or a fire.

Until now, cam switches have usually operated electrical devices connected to them by manually turning knobs to rotate the camshaft to the required position, opening or closing the required contacts.

However, the electric equipment operated by the cam switch is located indoors or outdoors, is not always located close to the driver, and is often installed in a location far from the driver, and in order for the driver to operate the devices It is inconvenient to operate by going directly to a long distance, especially in case of an emergency, several electrical equipment must be completed in a short time in succession, but since these devices are located at a long distance, it takes a lot of time to operate, so that they can quickly rectify the situation. In many cases, it caused trouble.

In this case, an attempt has been made to drive the camshaft with an electric motor to remotely operate the cam switch. However, when the position where the electric motor rotates and stops becomes the intermediate position of the contacts, the contact is damaged or causes a fire to drive the electric motor. It was not made practical.

The present invention realizes a cam switch driving device configured to drive a cam switch with an electric motor so that the cam shaft is not stopped at an intermediate position between opening and closing of a contact in order to solve such a conventional inconvenience.

The drive device of the present invention comprises a drive shaft coupled with a cam shaft to rotate the cam shaft, a disk coupled to rotate integrally with the drive shaft and having a long hole in the circumferential direction, and inserted into the long hole of the disk and rotating the disk in left and right portions of the long hole. Two-color color light emitting lamp including a first gear in which the pin is integrally coupled, a second gear meshed with the first gear, and a rotation force generating means for rotating the second gear, and indicating a state where the driving shaft is located. (Eg red is automatic, green is manual) is attached to indicate the operating position.

Positioning means for positioning the drive shaft is coupled to a first position coupled to transmit the driving force of the first gear to the disk and a second position coupled so as not to be transmitted, the positioning means is a first groove formed in the drive shaft And a second groove, a ball that can be inserted into the first groove or the second groove, and a spring that pushes the ball toward the grooves.

In addition, a position sensing means for detecting the position of the drive shaft in the first position or the second position is further installed, the position sensing means is a ball that can be inserted into the first groove or the second groove, and the ball It includes a micro switch that is operated when pushed up by the drive shaft.

The control circuit for driving the apparatus includes a motor having a rotational force for rotating the camshaft, a relay having a contact connecting the power supply and the motor to apply a driving voltage to the motor, and an operating voltage through the optical sense of the relay. A first power supply circuit for applying a power supply; a second power supply circuit for applying an operating voltage to the relay through a cam switch; and a remote control switch for applying a remote control signal to a corresponding terminal of the cam switch. Is done.

A regenerative braking circuit is connected to both ends of the motor in parallel, and a program unit is connected to the second power supply circuit in series, and the light sense of the first power supply circuit is blocked by an index pin which is linked to the shaft of the motor. It is a more desirable circuit if the on and off are repeated continuously.

1 and 2 are a cross-sectional view of a part to explain the cam switch automatic drive device of the present invention.

The cam switch automatic drive device of the present invention can be used by being combined with a drive shaft (cam shaft) 43 of a conventional cam switch having a plurality of contacts 41 and a cam device 42 for turning these contacts on or off. It was made.

The cam switch automatic drive device includes a drive shaft 6 coupled with a cam shaft to rotate the cam shaft 43, a disk 5 coupled to rotate integrally with the drive shaft and having a long hole in the circumferential direction, and the disk 5 A first gear inserted into the long hole of the long hole and integrally coupled with the pin 8 for rotating the disk at the end of the long hole; a second gear engaged with the first gear; and rotation force generating means for rotating the second gear. It is done by

The drive shaft 6 is formed at the end side in which the quadrangular camshaft receiving groove into which the quadrangular camshaft 43 is inserted is engaged with the cam device 42. Therefore, the cam shaft may be inserted deeply into the receiving groove, or may be inserted shallowly, that is, the cam shaft is slid and coupled, but the receiving groove and the cam shaft are machined to be coupled while being in close contact with each other in a rectangular shape so that the two shafts may be rotated when rotating. It is integrated and rotates together. This drive shaft is inserted into the shaft hole of the first gear that moves in the drive shaft through hole formed in the front bracket 3 attached to the front plate 1 and is rotatably coupled to the rear bracket 4 attached to the rear plate 2. . The drive shaft 6 is also capable of moving a predetermined distance in the axial direction in order to engage or disengage the disk 5 from the first gear. To this end, two grooves, that is, a first groove and a second groove, are dug in the circumference of the portion adjacent to the front plate 1, and the grooves 20 squeezed by the spring 10 are coupled to the grooves. It enters in the spring hole formed in this front bracket 3, the entrance of this spring hole is blocked by the bolt 21, The ball 20 is located in the entrance of the drive shaft side of this spring hole. Thus, when the drive shaft is moved forward (in the drawing direction with the handle, that is, the left direction), the ball is engaged in the first hole, and when moved to the rear (opposite side, that is, the right direction), it is engaged in the second hole formed in the drive shaft. It is supposed to be. When the drive shaft is moved, of course, the spring contracts slightly, and when the ball moves in the receiving groove and moves to the position of the drive shaft groove, it is lowered back into the groove (the lower ball is raised up) and the drive shaft is always in either of two positions. It acts to stay in one position. The reason why the drive shaft is positioned in these two positions is to control the engagement of the first gear and the disk 5 when the cam switch is operated manually or automatically. That is, when the drive shaft is moved forward, the first gear and the disk are moved. By releasing the combination, it becomes the manual operation mode, and when the drive shaft is moved to the rear, the first gear and the disk are combined to be in the automatic operation mode.

The cam mechanism 42, the rear bracket 4, and the driving force generating means are supported by being coupled to the rear plate 2, and the driving shaft 6, the front bracket 3, etc. are coupled to the front plate 1 and supported. In addition, the front plate 1 and the rear plate 2 are joined by bolts 32 with four support posts 7 interposed therebetween.

The disk 5 is fixed to the drive shaft 6 with a bolt 22 and fixed with a fixing key 9. Thus, when the drive shaft 6 is moved back and forth or rotated integrally with the drive shaft is moved and rotated.

The first gear is located behind the disk 5 and the pin 8 integrally coupled to the first gear is inserted into the circumferential long hole 54 formed in the disk 5 so that the disk 5 rotates when the first gear rotates. It is supposed to rotate. The first gear has a hollow shaft portion, which passes through the shaft hole of the rear bracket 4 at the rear and is fitted with a rear bracket by a snap ring 19 fitted at the end of the rear bracket, with respect to the rear bracket. It becomes rotatable, the camshaft is inserted in the hollow shaft, and it is comprised so that a drive shaft may pass between a camshaft and a hollow shaft.

The rear bracket 4 is integrally coupled to the rear plate 2 by bolts or suitable means.

The second gear is engaged with the first gear, and the shaft is engaged with the motor shaft through the reducer 28 if supported by the rear plate. The second gear 12 has a plurality of index pins 18 formed on the circumference, which are means for providing rotation angle information of the second gear. The rotation angle information is obtained by optical sense for detecting whether the index pin passes. The angle between the pins of the index pins is set to match the cam angle of the cam switch. That is, when the angle of the cam switch is 30 degrees, the angle between the pins of the index pins is also set to 30 degrees.

Positioning means is provided to determine the position of the drive shaft, that is, at which of the two correct positions. This positioning means can be realized in various ways, but in this example, it consists of a microswitch 44 which is an automatic / manual mode detection switch and a ball 20 'for operating the microswitch. The ball 20 'is inserted into two first grooves or second grooves recessed in the drive shaft or is pushed up around the drive shaft by a drive shaft portion without these grooves. When the ball is pushed up by the drive shaft, the drive lever of the microswitch is moved. It operates, and when it enters a groove, it returns to a position so that the position of a drive shaft can be known. In the figure, a state in which the first gear and the disk are coupled, that is, an automatic operation mode state, is shown. In this case, the ball is inserted into the second groove so that the lever of the micro switch is released. When the drive shaft is moved forward by pulling the handle 45, the ball 20 inserted into the first groove is moved to be inserted into the second groove, and the ball 20 'in the second groove is pushed up onto the drive shaft to form a micro Operate the switch while pushing the lever of the switch. The automatic / manual mode display device is provided with a display device capable of confirming on two nameplate operation nameplates with one light emitting lamp 46 connected to a detection switch.

The operation of the apparatus thus configured will be described below.

First, in the case of manual operation, the drive shaft is pulled forward so that the ball 20 is located in the second groove and the drive shaft is located in the second position so that the disk 5 is released without being engaged with the first gear. It works as follows. That is, when the handle 45 is manually rotated, the plurality of contacts 41 open and close corresponding to the rotation angle of the camshaft.

Next, when the drive shaft is moved backward by pushing the handle 45, the ball 20 is moved to the first groove so that the drive shaft is positioned at the first position, and thus the disk 5 is engaged with the first gear. That is, the pin 8 of the first gear is inserted into the long hole of the disk, and the disk can be rotated by the rotation of the first gear. At this time, when the motor is driven by the remote control signal, the second gear is rotated through the reducer coupled to the shaft of the motor, and thus the first gear is rotated. The disc rotates according to the rotation of the first gear, but there is a slight difference depending on the position of the pin and the hole at the moment of the engagement. The first gear is a state-variable first gear as shown in FIGS. 4A and 4B. When the disk rotates counterclockwise, the disk also immediately turns to the left, but in the state as shown in FIG. 4C, the first gear is slightly rotated so that the edges of the pin and the long hole contact each other, and the disk also rotates like the first gear.

The camshaft is integrated with the cam 51, the disk is integrated with the drive shaft, and the camshaft and the driveshaft are integrally rotated when the camshaft and the driveshaft rotate. Thus, when the cam fixing roller 52 is coupled to the cam by the cam device, it can be shown that the force is always positioned at the valley of the cam, as shown in FIG. Is showing. This is as if the cam 51 is integrally formed on the disk 5 and the cam fixing roller 52 is biased.

Now, before the disk rotates, it starts to rotate in the counterclockwise direction according to the first gear after being in the state as shown in FIG.

In this state, if the first gear rotates a little more, the cam 51 receives a force to rotate in the counterclockwise direction by the pressing force of the cam fixing roller, and rotates in the counterclockwise direction earlier than the first gear to As shown.

Subsequently, when the first gear is rotated, the operation as shown in FIG. 4A is repeated, and the operation as shown in FIG.

In the movement operation from the state a to the state b of FIG. 4, as the first gear is rotated, the cam fixing path is pushed to move toward the peak of the cam, and eventually reaches the top of the peak as shown in FIG. 4 b. . In this case, instead of configuring the first gear and the disk, that is, the edge of the pin and the long hole, the spring is tensioned with the spring therebetween. When the energy starts to accumulate in the spring, the energy accumulated in the spring becomes the energy that the cam fixing roller cannot be pushed up, and the energy accumulated in the spring gradually increases as the first gear rotates. For example, if it is made up to 90% of the energy used to push up to the top, the first gear rotates the camshaft from the top to the position of 90%, and the energy accumulated in the mask spring is ejected to rotate the disk and It is pushed up to 90%, instantaneously reaches the top, and moves rapidly to the next position.

That is, the movement of the camshaft is intermittent, the movement speed becomes rapid, and the contact and fall of the contact are quickly made, thereby increasing the effect of preventing arc generation.

When the cam reaches the required position, the control signal stops the rotation of the motor so that the cam switch stops at that position.

In order to rotate the camshaft of the cam switch to a predetermined position, it is assisted by a control circuit that receives a remote control signal and controls the motor.

3 shows a control circuit, where part A is a conventional cam switch part and part B is a control circuit part of the present invention.

Power for operating the control circuit is supplied to the +-terminal from the outside, the current flowing from the + power is the manual operation mode indicator lamp if the manual operation mode by the micro switch 74 (44 in Fig. 1) through the fuse 73. (LED: 75) lights up and flows through the current limiting resistor 76 to the-terminal.

In the automatic operation mode, the microswitch connects the circuit to a different position, so the current passing through the fuse passes through the microswitch and becomes a stable voltage through the voltage regulator (72: TR1, TR2, ZD1-ZD4, R1). The automatic operation mode indicator lamp (LED) is turned on and flows through the current limiting resistor 76 to the-terminal, and the other part of the motor is connected to both terminals of the motor through the normally open contact of the relay A or the relay B. After passing through the windings of (M, R3, R4), it flows to the-terminal through relay A or relay B contact. The diodes D1, D2, D3, and D4 are connected in pairs through the normal cross contacts of the relay A and the relay B in parallel with the windings of the motor at both ends of the motor. These diodes and normal cross contacts are circuits for regenerative braking by shortening the power generated by the motor's inertia when stopping the motor, and the circuits shorting according to the rotational direction of the motor are automatically relay A and relay B. It is determined by the normal cross contact of.

In addition, the current passing through the normal open contacts of the relay A and the relay B is stabilized by passing through the voltage regulators TR3 and ZD5-ZD8 through the diode D5 D6, and some of the light emitting diodes of the light sense 77 emit light. The current flows through the current limiting resistor R2 to the terminal, and another part flows to the relay A and the relay B through the light-receiving transistor of the light sense 77, respectively. The circuit of this relay A is the series circuit of the normal close contact of the volume VR1, the resistor R5, the diode D7, the relay A, and the relay B. The circuit of the relay B is the volume VR2, the resistor R6, the diode D8, the relay B, and the normal of the relay A. It is a series circuit of cross contact.

In addition, the voltage passing through the contacts of the switch SWa and the cam switch is connected to the relay A, and the voltage passing through the contacts of the switch SWb and the cam switch is connected to the relay B.

If the control switch SWa in the switch room 70 is turned on to connect the cam switch to the A-Bus in the switch room located at a distance from the cam switch, the position other than the position where the cam switch is connected to the A-Bus In the off position or the B-Bus position, the contacts 5-6 are turned on, and the + voltage causes the relay A to operate through the program unit 71. This program part is intended to be used when the operation of other switches must be preceded or when the cam switch is to be allowed to operate only under certain conditions. It is intended to transmit signals without programming, but several contacts or switches can be connected in series. It is only necessary to connect them so that signals are transmitted only under the condition that these contacts or switches are turned on or off.

When relay A is activated, the normal open contact is closed and the normal close contact is open. The relay is a self-maintaining relay, and once the relay is turned on, the contact is maintained until the power supply is cut off.

When the relay A is operated, the normally open contacts are turned on, so the motor rotates. Accordingly, the cam shaft is rotated, and the contact shaft 5-6 rotates the cam shaft to rotate the cam shaft toward the A-Bus (indicated by the handle). The contact remains until the camshaft reaches the A-Bus position. This process is indicated by the rectangular hatch and arrows in part A of the drawing. That is, the angular area indicated by the square hatch indicates that the corresponding contacts are attached.

Once relay A is active, it has a self-holding contact, so it remains active even when switch SWa is off. Therefore, the motor continues to rotate. The switch SWa is turned off or the cam shaft rotates to reach the A-Bus position. When this is off, one circuit for applying a voltage to the relay A is in a blocked state, and the other circuit that passes through the photosense is kept on and the photosense is off, i.e., between the light emitting diode and the light receiving transistor. When the index pin 18 (Figs. 1 and 2) of the second gear passes, the light of the light emitting diode does not reach the transistor, so the transistor is turned off and the relay A falls at the correct cam switch angle. Since one index pin is provided for each angle of the cam switch, each time the index pin passes through the optical sense, the index position of the cam shaft is checked. Therefore, it plays a role of turning off the relay together with the remote control signal at the angle at which the index pin passes, that is, the angle of the cam switch. The motor will stop and the knob will return to the A-Bus as desired by the remote control signal.

This time, if the remote control is attempted to change the connection to the B-Bus while the A-Bus is connected, that is, the handle is in the position of the A-Bus, the control circuit is in the automatic operation mode and the control switch SWB is turned on. , Because the cam switch is connected to A-Bus, contact 5-6 is off and contact 7-8 is on, so + voltage causes relay B to operate via program part 71.

When relay B is operated, normal open contact is closed and normal close contact is open. Therefore, the motor is rotated because the normal open contacts are turned on (the voltage polarity is reversed when relay A is turned on and is rotated in the opposite direction). Therefore, the camshaft also rotates. Contacts 7-8 rotate the camshaft in the direction of the arrow to rotate the camshaft toward the B-Bus (marked by the handle). The contact remains until the camshaft reaches the B-Bus position.

Since switch SWB is on and contacts 7-8 are still attached, relay B remains in operation and the motor continues to rotate. The camshaft rotates to reach the B-Bus position, and the contacts 7-8 are turned off, and one circuit for applying a voltage to the relay B is cut off, and the other circuit that passes through the photosense is kept on. If the light sense passes through the index pin 18 (Figs. 1 and 2) of the second gear, the light of the light emitting diode does not reach the transistor, so that the light receiving transistor is turned off so that the relay B cannot operate. The motor will stop and the handle will return to the B-Bus as desired by the remote control signal.

Next, when the remote switch OFF is turned on to turn off the cam switch, either the cam switch 9-10 or the contact 11-12 is turned on according to the cam shaft position at that time and the cam shaft is rotated in the direction of the arrow. This is because the relay A is turned on when the cam switch 9-10 is turned on, and the relay B is turned on when the contact 11-12 is turned on to rotate the cam shaft. Even in this case, when the cam switch reaches the OFF position, both the contacts 9-10 and 11-12 are turned off. When the index pin blocks the light sense, the motor is stopped and the handle is in the OFF position.

Since the motor has inertia, even when the power is cut off, the regenerative braking method is used to stop it quickly. That is, when the relay A is in operation while the motor is being operated by the voltage, the diodes D3 and D4 connected to the normal cross contact of the relay B are connected to both ends of the motor. In this case, however, the direction of the diode is opposite to the voltage applied to the motor, so no current flows through the diode. If the power supplied to the motor is turned off (relay A is off), the motor no longer functions as a motor and this time the inertial energy begins to generate. Since the generated electromotive force has a polarity opposite to that of the motor driving voltage, the current flows in the forward direction of the diodes D3 and D4, thereby causing braking by itself. If relay B is in operation and stops, the reverse is true.

As described above, the cam switch automatic driving device of the present invention can be very usefully used in a remote control system by solving a problem of the prior art which has not been realized so far.

The scope of the present invention is not limited only to the specific embodiments described above, but can be applied to a mechanism for rotating the drive shaft for switching in all switch drive devices based on the spirit of the present invention, as well as various modifications within the scope of the present invention. And changes can be made.

Claims (13)

A drive shaft coupled with the cam shaft to rotate the cam shaft, a disk coupled to rotate integrally with the drive shaft and having a long circumference in the circumferential direction, and a pin inserted into the long hole of the disk and rotating the disk in the left and right portions of the long hole; And a first gear coupled to each other, a second gear meshed with the first gear, and a rotation force generating means for rotating the second gear. The cam according to claim 1, wherein the positioning means for positioning the drive shaft is coupled to a first position where the driving force of the first gear is coupled to the disk and to a second position where the driving force is not transmitted. Switch auto drive. The method of claim 2, wherein the positioning means, the first groove and the second groove formed in the drive shaft, a ball that can be inserted into the first groove or the second groove, and a spring for pushing the ball toward the grooves Cam switch automatic drive device characterized in that consisting of. 3. The cam switch automatic driving device according to claim 2, further comprising a position detecting means for detecting the position of the drive shaft in the first position or the second position. The method of claim 4, wherein the position detecting means includes: a first groove and a second groove formed in the drive shaft, a ball that can be inserted into the first groove or the second groove, and the ball is formed with a groove of the drive shaft. Cam switch automatic drive device characterized in that it comprises a micro-switch to be switched by the operating lever when pushed up by the part of the. The cam switch automatic driving device according to claim 1, wherein an index pin is formed on a side of the second gear so that information on a rotation angle of the second gear can be detected by the index pin and a light detection sense. . The disk of claim 1, wherein four long holes are formed at the upper limit of the first, second, third, and fourth of the disk, and four pins are formed at the first gear, one at an angle of 90 degrees. Cam switch automatic drive device characterized in that the four pins are configured to be coupled to the respective positions corresponding to the four holes when coupled to. A circuit for controlling a motor for driving a camshaft of a cam switch, the circuit comprising: a motor for generating a rotational force for rotating a camshaft; A first power supply circuit for applying an operating voltage to the relay through a photosense, a second power supply circuit for applying an operating voltage to the relay through a cam switch, and applying a remote control signal to a corresponding terminal of the cam switch. Cam switch automatic drive control circuit characterized in that it comprises a remote control switch for. The cam switch automatic driving device control circuit according to claim 1, wherein a regenerative braking circuit is connected in parallel to both ends of the motor. The cam switch automatic driving device control circuit according to claim 1, wherein a program section is connected in series to the second power supply circuit. The cam switch automatic driving device control circuit according to claim 1, wherein the light sense of the first power applying circuit is light-blocked by an index pin which is interlocked with a shaft of the motor, so that the on / off is repeated continuously. The control circuit of claim 1, wherein the first power supply circuit is connected to the first power supply circuit so that power is not supplied in the manual mode through a manual / automatic mode detection switch interlocked with a camshaft. 13. The cam switch automatic drive control circuit according to claim 12, characterized in that a display device capable of confirming on a two-colored color nameplate operation plate with one light emitting lamp connected to the automatic / manual mode detection switch is provided.