JP2010252465A - Dc high-voltage generating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a DC high-voltage generating device having a safety mechanism which can monitor the heat generation status of a component sealed into a circuit sealing resin, and the line-breakage status of a transmission line of a cable. <P>SOLUTION: A thermistor 35 is arranged in the vicinity of the component which is a boost transformer 19, whose characteristics depend on a temperature in a resin molding 7. Furthermore, one side of the thermistor 35 is grounded via a shielding line 45a of a shielding member 45 which surrounds the transmission line 43 of a cable 41. Accordingly, the heat generation status of each component can be confirmed, and line breakage of the shield line 45a can be confirmed, thus stopping the DC high-voltage generation device 1, before the temperature exceeds the rated temperature or before the transmission line 43 is actually broken. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a direct current high voltage generator that is provided in a painting robot, an agrochemical spreader, or the like and generates a direct current high voltage.

  A DC high voltage generator for generating a DC high voltage is provided in a painting robot, an agrochemical spreader, or the like. As described in Patent Document 1, a circuit encapsulating resin portion having a high voltage generation circuit, and a high voltage generation A controller for controlling the circuit and a cable portion having a plurality of transmission lines for connecting the controller and the high voltage generation circuit.

JP 2003-134824 A

In this type of DC high voltage generator, the step-up transformer, diode, capacitor, and resistor that generate DC high voltage generate heat due to their electrical resistance, but when the heat generation temperature is higher than the rating, The performance of each part may deteriorate or break down. However, conventionally, such exothermic temperature has not been particularly considered. Therefore, since the circuit encapsulating resin part is expensive, which costs hundreds of thousands of yen, we want to reduce the number of exchanges as much as possible.
In addition, when the DC high voltage generator is built in the arm of the painting robot, the arm moves freely according to the shape of the surface to be painted, so the cable part may be twisted or bent. May break. Thus, if an accident that breaks during painting occurs, the painting operation will be interrupted, and the work efficiency will be greatly reduced. Therefore, it is desirable to avoid interruption of the painting operation as much as possible.

  The present invention has been made paying attention to the above-mentioned conventional problems, and in the DC high voltage generator, monitors the heat generation status of the parts enclosed in the circuit encapsulating resin part and the situation before the disconnection of the transmission line in the cable part. It is an object to provide a device equipped with a security mechanism that can be used.

  SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and the invention of claim 1 is directed to a circuit encapsulating resin portion in which a high voltage generating circuit is encapsulated in resin, and the high voltage generation of the circuit encapsulating resin portion. In a DC high-voltage generator comprising a controller for controlling a circuit, and a cable part having a plurality of transmission lines connecting the controller and the high-voltage generating circuit of the circuit-encapsulating resin part, the circuit-encapsulating resin The temperature detecting unit for detecting the temperature is enclosed in an insulated state with respect to the high voltage generating circuit, and the temperature detecting unit is connected to the controller via the cable unit. It is a high voltage generator.

  According to a second aspect of the present invention, in the direct current high voltage generator according to the first aspect, the temperature detection unit is constituted by a thermistor.

  According to a third aspect of the present invention, in the DC high voltage generator according to the second aspect, the thermistor is connected to an easily breakable line that is weaker than the transmission line and easily breaks, and the disconnection of the easily breakable line is detected by the controller. This is a direct current high voltage generator.

  According to a fourth aspect of the present invention, in the direct-current high-voltage generator according to the third aspect, the cable portion includes a plurality of transmission lines and a shield member surrounding them, and one end side of the thermistor is an easily breakable line. A DC high-voltage generator, connected to a shield member, wherein the other end side of the thermistor is connected to a controller via the transmission line, and disconnection of the shield member is detected by the controller. .

  According to a fifth aspect of the present invention, in the DC high-voltage generator according to the third or fourth aspect, the controller issues an alarm when the temperature detected by the thermistor exceeds a predetermined temperature, or when the breakable wire is disconnected, or The DC high voltage generator is characterized in that the power supply is automatically stopped.

  According to the direct-current high-voltage generator of the present invention, it is possible to monitor the heat generation status of components encapsulated in the circuit-encapsulating resin portion and the status before disconnection of the transmission line of the cable portion.

It is a side view of the circuit resin enclosure part and cable part of the direct-current high-voltage generator which concern on Embodiment 1 of this invention. FIG. 2 is an electrical wiring diagram of the DC high voltage generator of FIG. 1. It is a figure for demonstrating operation | movement of the arm incorporating the direct-current high-voltage generator of FIG. It is an electrical wiring diagram of the direct-current high-voltage generator which concerns on Embodiment 2 of this invention.

A direct-current high-voltage generator 1 according to Embodiment 1 of the present invention will be described with reference to FIGS.
This DC high voltage generator 1 is provided in a painting robot for electrostatic painting.
As shown in FIGS. 1 and 2, the direct-current high voltage generator 1 includes a circuit-encapsulating resin portion 3, a cable portion 41, and a controller 51.

In the circuit encapsulating resin portion 3, the high voltage generating circuit 5 is encapsulated in the resin molded body 7. In FIG. 1, the side surface of the resin molded body 7 is cut off, and the high voltage generation circuit 5 is visible.
The configuration of the high voltage generation circuit 5 will be described with reference to FIG.
Reference numeral 11 denotes a receptacle connector, and the receptacle connector 11 is disposed at a base end portion (left end portion in FIG. 1) of the circuit encapsulating resin portion 3. The receptacle connector 11 is provided with a plurality of male terminals 15 (15a to 15g). A step-up transformer 19 is disposed on the right side of the receptacle connector 11, and a cockcroft Walton circuit 23 is disposed on the right side of the step-up transformer 19. The cockcroft Walton circuit 23 includes a plurality of capacitors 25 and a plurality of diodes 27. An output resistor 29 is disposed on the right side of the cockcroft Walton circuit 23, and an output terminal 31 is disposed on the right side of the output resistor 29. Below the step-up transformer 19 and the Cockcroft Walton circuit 23, voltage measuring resistors 17 and 18 and a protective resistor 21 are arranged.

  Reference numeral 35 denotes a thermistor as a temperature detector, and the thermistor 35 has a negative characteristic. The thermistor 35 is disposed in the vicinity of the step-up transformer 19. The step-up transformer 19 is a component whose characteristics particularly depend on temperature when the high voltage generating circuit 5 is in operation.

  In order to ensure a sufficient insulation distance between the components, the above-described high voltage generation circuit 5 is enclosed in a resin molded body 7 having excellent voltage resistance. The resin constituting the resin molded body 7 and surrounding each part is a thermosetting resin. Encapsulation / molding in the resin is performed by inserting the high voltage generating circuit 5 together with the male terminal 15 into a mold or resin case, pouring the molten resin, solidifying it, and taking it out.

  Reference numeral 41 denotes a cable portion. The cable portion 41 includes a plurality of coated transmission lines 43 (43 a to 43 g), a shield member 45 disposed so as to surround the plurality of transmission lines 43, and the shield member 45. It consists of a skin 47 covered from the outside. The plurality of transmission lines 43 extend linearly next to each other. The shield member 45 is formed by braiding a large number of shield wires 45a. A plug connector 49 is provided at the end of the cable portion 41, and the plug connector 49 is connected to the receptacle connector 11 on the circuit-encapsulating resin portion 3 side.

Next, the electrical wiring of the DC high voltage generator 1 will be described with reference to FIG.
Reference numeral 51 denotes a controller. A CPU 53 of the controller 51 is connected to a memory 55 in which a rated temperature and the like are stored, a transistor 57 inserted in a power supply line of a DC power supply 61, and a buzzer 59 as an alarm unit. Yes.

The primary coil of the step-up transformer 19 is connected to the controller 51 via male terminals 15a, 15b, 15c and transmission lines 43a, 43b, 43c. The secondary coil of the step-up transformer 19 is connected to the Cockcroft Walton circuit 23. One end of an output resistor 29 is connected to the high voltage side (right side in FIG. 2) of the Cockcroft Walton circuit 23, and the other end of the output resistor 29 is connected to the output terminal 31. The output terminal 31 is connected to a high voltage portion (not shown) of the electrostatic coating machine S.
One end of a voltage measurement resistor 17 is connected to the high voltage side of the Cockcroft Walton circuit 23, and one end of a voltage measurement resistor 18 is connected to the other end of the voltage measurement resistor 17. The other end of the voltage measuring resistor 18 is connected to the controller 51 via a male terminal 15f and a transmission line 43f, and is grounded in the controller 51.

A connection point between the voltage measuring resistor 17 and the voltage measuring resistor 18 is connected to the controller 51 through a male terminal 15e and a transmission line 43e.
One end of the secondary coil of the step-up transformer 19 is connected to the controller 51 through a male terminal 15d and a transmission line 43d.
One end of the protective resistor 21 is connected to the male terminal 15d, and the other end is connected to the male terminal 15f.
With the above configuration, a stable high voltage can be supplied while monitoring the input voltage / current value and the output voltage / current value.

One end side of the thermistor 35 is connected to the controller 51 via the male terminal 15g and the transmission line 43g, and the other end side is connected to one shield wire 45a of the shield member 45. A lead wire 46 is drawn out to the connected shield wire 45 a, and the lead wire 46 is grounded in the controller 51.
With this configuration, the controller 51 can measure the temperature in the circuit encapsulating resin portion 3 as a voltage change. Moreover, since the output voltage becomes abnormal when the shield wire 45a is disconnected, it is possible to detect the disconnection. Since the shield line 45a is weaker than the transmission line 43 and easily breaks, it can be seen that the transmission line 43 is easily broken by the break of the shield line 45a.

Next, the arrangement state in the painting robot will be described with reference to FIG.
An electrostatic coating machine S is attached to the tip of the arm A, and the circuit encapsulating resin portion 3 is disposed in the electrostatic coating machine S. The cable portion 41 is inserted through the arm A and passes through a plurality of joint portions (not shown). During the painting operation, as shown in (1), (2), and (3), the plurality of joints operate and the posture of the arm A changes from the basic posture to the twisting posture or the bending posture, whereby the cable portion 41 is twisted. Or bend.

Next, the operation of the DC high voltage generator 1 will be described.
Under the control of the controller 51, the power supplied from the DC power supply 61 is output from the output terminal 31 of the high voltage generation circuit 5 to a high voltage portion (not shown) of the electrostatic coating machine S. During high voltage output, the controller 51 constantly measures and monitors the temperature near the step-up transformer 19 by the thermistor 35.
When the controller 51 determines that the temperature detected by the thermistor 35 has exceeded the rated temperature, the controller 51 sends a signal to the buzzer 59 to generate an alarm sound for notifying the abnormal temperature. With this alarm sound, the operator can confirm that the step-up transformer 19 is becoming abnormally high temperature, and can stop the DC high-voltage generator 1 before a failure actually occurs.

As shown in FIG. 3, when the cable portion 41 is twisted or bent and the shield wire 45a is disconnected, the controller 51 detects an abnormality in the output voltage. As a result, the controller 51 knows that the shield wire 45a is broken.
When the controller 51 detects the disconnection of the shield wire 45a, the controller 51 sends a signal to the buzzer 59 to generate an alarm sound for notifying the disconnection. By this alarm sound, the operator can confirm that the shield wire 45a is disconnected, and can stop the DC high voltage generator 1 before the transmission line 43 is actually disconnected.
In addition, the temperature measurement means centering on the thermistor 35 can monitor the heat generation situation around the highly temperature-dependent parts and the situation before the disconnection of the transmission line of the cable part, so that it is as large as the existing DC high voltage generator. Can be maintained.

A DC high voltage generator 71 according to Embodiment 2 shown in FIG. 4 will be described.
Since DC high-voltage generator 71 has the same components as DC high-voltage generator 1 according to Embodiment 1, the same components as DC high-voltage generator 1 have the same reference numerals as those in Embodiment 1. The description will be omitted, and only the components different from the DC high voltage generator 1 will be described.
Reference numeral 73 denotes an easily breakable wire (conductive wire), and this easily breakable wire 73 is used in place of the transmission line 43 g of the DC high voltage generator 1 according to the first embodiment. The easily breakable line 73 is formed of a conductive wire that is weaker than the transmission line 43 (43a to 43f) and easily breaks. If the easily breakable line 73 tends to be disconnected, its resistance value increases by about 100%. The easily breakable line 73 is surrounded by the shield member 45 together with the transmission lines 43 (43a to 43f).

One end of the thermistor 35 is connected to the controller 51 via a male terminal 15g and an easily breakable wire 73, and the other end is connected to the male terminal 15f.
With this configuration, the controller 51 can measure the temperature in the circuit encapsulating resin portion 3 as a voltage change. Further, when the easily breakable line 73 starts to be disconnected, even if the easily breakable line 73 is not completely disconnected, the output voltage becomes abnormal, so that the disconnection can be detected.
As described above, the easily breakable line 73 is formed of a conductive wire that is weaker than the transmission line 43 and easily breaks. Therefore, it can be seen that the easily broken line 73 breaks the transmission line 43 easily.
In the case of this embodiment, the disconnection of the easily breakable line includes not only a complete disconnection but also a partial disconnection.

For example, the controller 51 determines that a disconnection occurs when the resistance value of the thermistor 35 is increased when no high voltage is generated within the past two hours.
Alternatively, since the rate of temperature rise due to the amount of high voltage generated and the time of generation is quantitative, a quantitative value (high voltage generation amount, time, temperature) is stored in advance in the memory 55 of the controller 51, and the stored quantitative value is stored. The value is compared with the current value (high voltage generation amount, time, measured temperature), and it is determined that the wire is disconnected if it is out of the specified range.
Or, as described above, when the easily breakable line 73 tends to be disconnected, its resistance value increases by about 100%. Since the practical temperature measurement by the thermistor 35 is 0 ° C. to 100 ° C., the change in the resistance value of the thermistor 35 in this temperature range is set within 10% of the increase in the resistance value of the easily breakable line 73. Then, for example, 50% of the increase in resistance value is set as a threshold value, and it is determined that the disconnection occurs when the resistance value of the thermistor 35 is 50% or more of the increase in resistance value.

  When the controller 51 detects the disconnection of the easily breakable line 73, the controller 51 sends a signal to the buzzer 59 to generate an alarm sound for disconnection notification. With this alarm sound, the operator can confirm that the easily breakable line 73 is disconnected, and can stop the DC high voltage generator 71 before the transmission line 43 is actually disconnected.

The embodiment of the present invention has been described in detail above. However, the specific configuration is not limited to this embodiment, and the present invention can be changed even if there is a design change without departing from the gist of the present invention. included.
In the above-described embodiment, the buzzer 59 is used as the alarm unit, but an indicator lamp or the like may be used instead of or together with it.
Further, a circuit configuration may be adopted in which the power supply is automatically cut off by turning off the transistor 57 instead of or together with the alarm unit.
In the above embodiment, since the disconnection is also detected, the temperature detection unit is configured by the thermistor 35 having a negative characteristic, but may be configured by a thermistor having a positive characteristic. Further, when the cable portion 41 is not bent, it is sufficient to measure the temperature, and the cable portion 41 may be constituted by a thermocouple.
Accordingly, in the present specification, the breakage of the easily breakable line includes not only a complete breakage but also a partial breakage.

  The DC high-voltage generator of the present invention can be used in the manufacturing industry of painting robots and agricultural chemical spreaders.

DESCRIPTION OF SYMBOLS 1 ... DC high voltage generator (Embodiment 1) 3 ... Circuit enclosure resin part 5 ... High voltage generation circuit 7 ... Resin molded body 11 ... Receptacle connector 15 ... Male terminal 17, 18 ... Voltage measurement resistor 19 ... Boost Transformer 21 ... Protective resistance 23 ... Cockcroft Walton circuit 25 ... Capacitor 27 ... Diode 29 ... Output resistance 31 ... Output terminal 35 ... Thermistor 41 ... Cable portion 43 ... Transmission line 45 ... Shield member 45a ... Shield wire 46 ... Conducted wire 47 ... Outer skin 49 ... Plug connector 51 ... Controller 53 ... CPU
55 ... Memory 57 ... Transistor 59 ... Buzzer 61 ... DC power supply 71 ... DC high voltage generator (Embodiment 2) 73 ... Easy break line A ... Arm S ... Electrostatic coating machine

Claims (5)

A circuit encapsulating resin portion in which a high voltage generating circuit is encapsulated in a resin, a controller for controlling the high voltage generating circuit in the circuit encapsulating resin portion, and the controller and the high voltage generating circuit in the circuit encapsulating resin portion. In a DC high voltage generator configured by a cable portion having a plurality of transmission lines to be connected,
Furthermore, a temperature detection unit for detecting temperature is enclosed in the circuit encapsulating resin unit in an insulated state with respect to the high voltage generation circuit, and the temperature detection unit is connected to the controller via the cable unit. DC high voltage generator characterized by the above. In the DC high-voltage generator according to claim 1,
A direct current high voltage generator characterized in that the temperature detector is constituted by a thermistor. In the DC high-voltage generator according to claim 2,
The thermistor is connected to an easily breakable line that is weaker than a transmission line and easily broken, and a disconnection of the easily broken line is detected by a controller. In the DC high-voltage generator according to claim 3,
The cable portion includes a plurality of transmission lines and a shield member surrounding them, and one end of the thermistor is connected to the shield member as an easily breakable line, and the other end of the thermistor is connected to the controller via the transmission line. The DC high-voltage generator is characterized in that a disconnection of the shield member is detected by the controller. In the DC high-voltage generator according to claim 3 or 4,
The controller generates a warning when the temperature detected by the thermistor exceeds a predetermined temperature, or when the easily breakable line is broken, or automatically stops the power supply.

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