JP2011034790A - Connector device and industrial robot equipped with it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connector device in which an internal pressure explosion-proof container is not separated by vibration. <P>SOLUTION: The connector device 10 has a connector 25 which electrically connects and disconnects a motor 7 and an outside power source installed in an internal pressure explosion-proof container 3 provided in an industrial robot. A through-hole 8 is formed in the internal pressure explosion-proof container 2 for exposing the connector 25 from the internal pressure explosion-proof container 2 and a connector casing 11 is fixed so as to cover this through-hole 8. A cable 13 for connecting the connector 25 and the external power source is inserted into the connector casing 11, and a clamp member which supports the cable 13 is housed in the connector casing. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a connector device for an internal pressure explosion-proof container for electrically connecting an electric drive device in an internal pressure explosion-proof container provided in an industrial robot and an external power source outside the internal pressure explosion-proof container, and The present invention relates to an industrial robot provided.

  Industrial robots such as painting robots include electric drive devices such as electric motors, electromagnetic valves, or electropneumatic valves. The electric drive device is driven by a current from an external power source such as a commercial power source. A connector is interposed between the electric drive device and the external power supply, and the electrical drive device and the external power supply can be electrically connected and disconnected by this connector. When handling a volatile solvent such as a painting robot, the robot body is installed in an atmosphere containing a volatile solvent (so-called hazardous area). If an electrical spark occurs in a connector, the volatile solvent is ignited. May explode. Various countermeasures have been taken against such explosions, and various explosion-proof structures have been developed.

  As an explosion-proof structure, for example, there is an internal pressure explosion-proof structure as described in Patent Document 1. In this internal pressure explosion-proof structure, an electric drive device and a connector are arranged in an internal pressure explosion-proof container, and the internal pressure of the internal pressure explosion-proof container is kept higher than the external pressure by pressurizing with a pump, so that a volatile solvent enters the internal pressure explosion-proof container. It seems that there is not. Thereby, even if an electric spark is generated in the connector or the like, the volatile solvent is not ignited and an explosion does not occur.

JP-A-6-260241

  The painting robot includes a plurality of indirect manipulators, and a painting nozzle provided at the tip of the manipulator can be moved by bending the indirects. In the painting robot, the manipulator vibrates when bending a plurality of indirects, and this vibration is transmitted to the internal pressure explosion-proof container, causing the connector in the internal pressure explosion-proof container to vibrate. The connector includes a socket and a plug, and the electric drive unit and an external power source are electrically connected by inserting the plug into the socket. For this reason, when the connector vibrates, the plug may loosen or come off the socket and contact failure may occur in the connector, and the external power supply and the electric drive device may be electrically disconnected. When separated, the corresponding joint is not bent and the coating nozzle cannot be moved to a desired position. Therefore, it is necessary to prevent the electric drive device and the external power source from being electrically disconnected from each other even if the internal pressure explosion-proof container vibrates.

  Accordingly, an object of the present invention is to provide a connector device in which an electric drive device and an external power source are not electrically disconnected even when an internal pressure explosion-proof container vibrates.

  The connector device of the present invention includes an electrical drive device in an internal pressure explosion-proof container provided in an industrial robot, a connector capable of electrically connecting and disconnecting an external power source outside the internal pressure explosion-proof container, and the internal pressure explosion-proof device. A connector casing for closing a through-hole formed in the internal pressure explosion-proof container for exposing the connector from the container for use, a cable for inserting the connector casing and connecting the connector and an external power source, and A clamp member which is fixed in the connector casing and holds the cable.

  According to the present invention, the cable is held by the clamp member, so that the cable does not move much even if the internal pressure explosion-proof container vibrates with the vibration when the industrial robot is driven, and the external power source and the electric drive device are electrically connected. Can be kept connected. That is, it is possible to prevent the external power source and the electric drive device from being electrically disconnected, and it is possible to prevent the industrial robot from being stopped due to this.

  Further, since the clamp member is fixed to the connector casing, when the connector cable vibrates, the clamp member vibrates in the same manner as the connector cable. In the cable, relative vibration between the portion inserted into the connector casing and the portion held by the clamp member is reduced, and the vibration of the connector during vibration can be suppressed. Thereby, it can prevent that an external power supply and an electric drive device are electrically disconnected with this vibration, and it can prevent that an industrial robot stops suddenly resulting from it.

  In the above invention, the connector has an electric drive device side contact and an external power supply side contact that can be connected to and disconnected from each other, and the electric drive device side contact is connected to the electric drive device and fixed to the internal pressure explosion-proof container. The external power supply side contact is preferably provided on the clamp member connected to an external power supply via a cable.

  According to the above configuration, the electrical drive unit side contact and the external power source side contact are electrically disconnected by removing the connector casing from the internal pressure explosion-proof container, and the connector casing is fixed to the internal pressure explosion-proof container. The driving device side contact and the external power source side contact are electrically connected. Since the electrical connection and disconnection between the electric drive device and the external power source can be performed by detaching the connector casing in this manner, the connection and disconnection are easy.

  In the above invention, it is preferable that the clamp member holds the cable so that the pressure acting on the outer peripheral surface of the cable is substantially uniform.

  According to the above configuration, even if the holding force of the clamp member is increased, the cable is not bent and flattened, and disconnection of the cable wiring can be suppressed. Therefore, the cable can be held and retained with a large holding force, and the cable can be more difficult to be pulled out.

  In the above invention, a protective sheath that is provided on an exposed portion of the cable that protrudes from the connector casing and covers the exposed portion, and an insertion formed in the connector casing so that the cable can be inserted therethrough. A retaining mechanism that is provided in an outer opening of the hole and that holds the protective sheath; and an inner seal structure that is provided in the inner opening of the insertion hole and prevents gas entering between the connector casing and the cable; The connector casing is preferably fixed to the internal pressure explosion-proof container in a state where the seal is achieved.

  If the said structure is followed, it can prevent that the exposed part of a cable will be exposed by retaining a protective exterior by a retention | holding mechanism, for example, a protective exterior remove | deviating from a cable. Thereby, even if the cable is bent or moved, a part of the cable is not exposed, and the wiring can be prevented from being exposed due to damage to the cable.

  Since such a retaining mechanism is provided in the outer opening of the insertion hole, an inner seal structure is provided in the inner opening, and gas flows between the contact casing and the cable by the inner seal structure. Is prevented. By fixing the connector casing provided with such an internal seal structure to the internal pressure explosion-proof container in a state where the seal has been achieved, it is possible to prevent gas from entering from the connector casing and the internal pressure explosion-proof container, Further, it is possible to prevent a decrease in internal pressure of the connector casing and the internal pressure explosion-proof container. In other words, the connector casing and the internal pressure explosion-proof container can be sealed simply by fixing the connector casing to the internal pressure explosion-proof container in a state where the seal is achieved, and the internal pressure explosion-proof container can be easily sealed. .

  In the above invention, the clamp member is preferably configured to hold between the inner seal structure and the connector.

  According to the said structure, it can hold | maintain in the location nearer to a connector. As a result, when the robot is driven, the deflection width of the portion on the connector side of the cable can be further reduced.

  In the above invention, the cable includes a plurality of wirings and a sheath covering the plurality of wirings, and tip portions of the plurality of wirings are exposed from the sheath and bent to the connector. It is preferable that they are connected.

  If the said structure is followed, even if a cable moves a little, the movement can be absorbed by the bending of wiring, and the disconnection of wiring can be prevented.

  An industrial robot according to the present invention includes any one of the connector devices described above and the internal pressure explosion-proof container.

  If the said structure is followed, an industrial robot provided with the above connector apparatuses is realizable.

  According to the present invention, even if the internal pressure explosion-proof container vibrates, the electric drive device and the external power source can be prevented from being electrically disconnected.

It is a top view which shows the internal pressure explosion-proof structure provided with the connector apparatus of this invention. It is sectional drawing which cut | disconnected the internal pressure explosion-proof structure of FIG. It is an expanded sectional view which expands and shows a part of internal pressure explosion-proof structure of FIG. It is an expansion perspective view which expands and shows a connector. It is an enlarged front view which expands and shows the clamp member of FIG. It is an enlarged front view which shows the clamp member of 2nd Embodiment. It is an enlarged front view which shows the internal pressure explosion-proof structure of 3rd Embodiment.

<First Embodiment>
The industrial robot includes a plurality of indirect manipulators. Each indirect is provided with an electric motor, and by driving each electric motor, the corresponding indirect can be bent and the attachment provided at the tip of the manipulator can be moved to a desired position. An industrial robot configured as described above may be used as a painting robot by attaching a coating nozzle to the tip of a manipulator, for example. This coating robot (hereinafter also simply referred to as “robot”) is disposed in an atmosphere containing a volatile solvent in order to apply a volatile solvent from a coating nozzle. The electric motor that is an electric drive device needs to be isolated from the atmosphere containing such a volatile solvent, and the coating robot has an internal pressure explosion-proof structure 1 as shown in FIG. 1 in order to isolate the electric motor. .

  The internal pressure explosion-proof structure 1 includes a hollow rectangular parallelepiped internal pressure explosion-proof container 2, and a pump 4 is connected to the internal pressure explosion-proof container 2 via a pressure regulating valve 3. The pump 4 supplies a high-pressure gas such as air or an inert gas to the internal pressure explosion-proof container 2, and the pressure regulating valve 3 regulates the gas supplied from the pump, and the internal pressure of the internal pressure explosion-proof container 2 Is kept higher than the external pressure. Further, a switching valve 5 is connected to the internal pressure explosion-proof container 2 in order to discharge the gas therein, and the switching valve 5 is connected to the internal pressure explosion-proof container 2 in accordance with a command signal from the robot controller 6. The gas inside is designed to be discharged.

  An electric motor 7 is accommodated in the internal pressure explosion-proof container 2 as shown in FIG. The electric motor 7 is arranged so that only its output shaft 7a protrudes from the internal pressure explosion-proof container 2 (see FIG. 1), and is fixed to the inner wall of the internal pressure explosion-proof container 2 in a state where a seal is achieved. The electric motor 7 fixed to the internal pressure explosion-proof container 2 in this way is connected to an external power source (not shown) such as a commercial power supply via the connector device 10, and the connector device 10 is connected to the internal pressure explosion-proof container 2. A through hole 8 is formed in the internal pressure explosion-proof container 2 for attachment. The through hole 8 is a hole having a rectangular cross section that penetrates the internal pressure explosion-proof container 2 in and out, and the connector device 10 is inserted into the through hole 8 so that a connector 25 described later is exposed outward. (See also FIG. 3).

  The connector device 10 includes a connector casing 11, and the connector casing 11 is provided on the outer wall of the internal pressure explosion-proof container 2 so as to close the through hole 8 from the outside. The connector casing 11 is generally a bottomed cylindrical shape having a rectangular cross section, and has a fixing flange 11b extending outward in the radial direction at the open end 11a. The fixing flange 11b has a rectangular shape in a plan view, and fasteners such as bolts are respectively inserted into the four corners thereof, and are fixed at predetermined positions by these fasteners. When fixing, a packing 12 is provided between the fixing flange 11 b and the internal pressure explosion-proof container 2, and the space between them is sealed by the packing 12. The connector casing 11 may be positioned by positioning pins or the like so as to be fixed at a predetermined position.

  An insertion hole 11c is formed along the axis of the bottom of the connector casing 11, and a cable 13 is inserted through the insertion hole 11c. Most of the cable 13 is exposed from the connector casing 11, and a hollow cylindrical protective sheath 14 is disposed outside the exposed portion 13 a. The protective sheath 14 is formed by laminating a plurality of layers including a mesh layer, and protects the exposed portion 13a so that the exposed portion 13a of the cable 13 is not damaged due to bending or application of force. is doing. In this manner, the protective sheath 14 that protects the exposed portion 13 a is provided with a fastening mechanism 15 so as not to be detached from the connector device 10.

  The retaining mechanism 15 includes an inner cap 16, an out cap 17, a retaining nipple 18, and an owl nut 19. The inner cap 16 and the outer cap 17 are formed in a substantially cylindrical shape, and are attached so as to be in close contact with the inner surface and the outer surface of the opening end portion 14a of the protective sheath 14 respectively. The opening end portion 14a of the protective sheath 14 is inserted into the retaining nipple 18 with the inner cap 16 and the out cap 17 attached.

  The retaining nipple 18 has a substantially cylindrical shape, one end of which is screwed into the outer opening 11d of the insertion hole 11c, and the retaining nipple 18 is screwed into the connector casing. 11 is fixed in a state where a seal is achieved. The space between the retaining nipple 18 and the connector casing 11 may not be sealed. The retaining nipple 18 has the opening end 14a of the protective sheath 14 inserted through the opening 18a on the other end side, and has a step on the inner surface thereof. The opening end portion 14a of the protective exterior 14 is seated on this stepped portion. An owl nut 19 having an inner taper 19 a is screwed to the other end of the retaining nipple 18. When the owl nut 19 is closed in a state where the protective sheath 14 is seated, the outer cap 17 is caused by the inner taper 19 a of the owl nut 19. The diameter of the upper end of the is reduced. Since the upper end portion of the out cap 17 is folded back inward, the outer peripheral surface of the protective outer sheath 14 is pushed inward by the upper end portion by reducing the diameter, and the outer cap 17 and the inner cap 16 protect the outer sheath. 14 is clamped and retained.

  By retaining the protective sheath 14 by the retaining mechanism 15 in this way, the exposed portion 13a of the cable 13 is prevented from being exposed due to the protective sheath 14 being detached from the connector device 10 or the like. Thereby, even if the cable 13 is bent or moved, a part of the cable 13 is not exposed, and it is possible to prevent the wiring 13c from being exposed due to the sheath 13b of the cable 13 being damaged.

  The cable 13 protected in this way passes through the retaining nipple 18 and further passes through the insertion hole 11 c and comes out into the connector casing 11. An inner seal structure 20 is provided in the inner opening 11 e of the insertion hole 11 c through which the cable 13 is pulled out into the connector casing 11. As shown in FIG. 3, the internal seal structure 20 includes a nipple 21, a packing 22, a lock nut 23, and a seal member 24. The nipple 21 is formed in a substantially cylindrical shape, and a flange 21a is formed on the outer surface of the nipple 21 so as to protrude outward in the radial direction over the entire circumference.

  The nipple 21 has the cable 13 inserted therein, and one end thereof is screwed into the inner opening 11e of the insertion hole 11c. An annular packing 22 is provided between the flange 21a of the nipple 21 and the connector casing 11, and the nipple 21 is sealed to the connector casing 11 by screwing the nipple 21 into the inner opening 8a. It is fixed in the state that has been achieved. A lock nut 23 is screwed to the other end of the nipple 21. A seal member 24 is accommodated in the lock nut 23, and the cable 13 is disposed so that both the lock nut 23 and the seal member 24 are inserted. The seal member 24 is formed in a substantially cylindrical shape, and a recess 24a that is recessed inward in the radial direction is formed on the outer periphery of the seal member 24 over the entire circumference. The seal member 24 can be ablated by the recess 24a. When the lock nut 23 is tightened, the seal member 24 is ablated by the lock nut 23 and the nipple 21. The cable 13 and the lock nut 23 are sealed in close contact with the lock nut 23.

  As described above, the internal seal structure 20 seals between the nipple 21 and the connector casing 11 and between the cable 13 and the lock nut 23, and prevents gas from passing through the through hole 8 into the connector casing 11. It is out. Thereby, it is possible to prevent gas containing a volatile solvent from entering the internal pressure explosion-proof container 2, and it is possible to prevent a decrease in internal pressure of the connector casing 11 and the internal pressure explosion-proof container 2. Thus, in the internal pressure explosion-proof structure 1, the connector casing 11 and the internal pressure explosion-proof container 2 can be hermetically sealed simply by fixing the connector casing 11 to the internal pressure explosion-proof container 2 in a state where sealing has been achieved. Accordingly, the connector device 10 can be easily attached and the internal pressure explosion-proof structure 1 can be easily sealed. That is, the cable 13 can be drawn into the connector casing 11 in a state where the seal is achieved.

  The cable 13 is a composite cable, has a sheath 13b, and has a plurality of wirings 13c in the sheath 13b. One end of each of the plurality of wirings 13 c is connected to an external power supply via an outlet, and the other end is electrically connected to the electric motor 7 via a connector 25. That is, one end of the cable 13 is electrically connected to an external power source, and the other end is electrically connected to the electric motor 7 via the connector 25.

  As shown in FIG. 4, the connector 25 has a plug 26 and a socket 27, and the electric motor 7 and the external power source are electrically connected by inserting or removing the plug 26, which is an electric drive device side contact, into the socket 27. Can be connected and disconnected. The plug 26 includes a rectangular substrate 26 a in plan view, and the outer dimension of the substrate 26 a is a size that can be inserted into the through hole 8. A plurality of pins 26b are erected on the front side surface of the substrate 26a. A wiring 28 is connected to each of the plurality of pins 26b, and the plurality of pins 26b are electrically connected to the electric motor 7 and the like via the plurality of wirings 13c. Thus, the plug 26 that is electrically connected to the electric motor 7 or the like is fixed to the mounting plate 29.

  The mounting plate 29 has a rectangular shape in plan view, and its outer dimension is larger than the outer dimension of the plug 26. Both ends in the longitudinal direction of the mounting plate 29 are fixed to the inner pressure chamber side peripheral edge 8b of the through hole 8 with fasteners such as bolts. Thus, the plug 26 is disposed in the inner opening 8 a of the through hole 8 and can be seen from the outside through the through hole 8. That is, the connect 25 is exposed from the through hole 8. In addition, since the dimension of the mounting plate 29 in the width direction is smaller than the outer diameter of the through hole 8, the through hole 8 is not completely covered by the mounting plate 29, and the inside of the connector casing 11 and the internal pressure explosion-proof are used. Gas can be exchanged between the container 2 (see arrow B in FIG. 4). Therefore, the internal pressure of the connector casing 11 substantially matches the internal pressure of the internal pressure explosion-proof container 2 and is higher than the external pressure.

  The socket 27, which is an external power supply side contact, has substantially the same shape as the board 26a of the plug 26 in plan view, and the same number of socket holes 27a as the pins 26b are formed in the socket 27 in order to fit the plurality of pins 26b, respectively. Has been. Each socket hole 27a is provided with a terminal (not shown). The cable 13 has the same number of wires 13c as the terminals, and each terminal is connected to the wire 13c.

  A clamp member 31 is provided in the connector casing 11 to hold the cable 13 to which the socket 27 is thus connected. The clamp member 31 includes a bracket 32, a clamp 33, and a plug fixing portion 34. The bracket 32 is a rectangular plate member and is provided in the connector casing 11. A base end portion of the bracket 32 is provided at the bottom of the connector casing 11 away from the cable 13 and is fixed to the connector casing 11 with a fastener such as a bolt. The bracket 32 thus fixed extends parallel to the axis of the connector casing 11, and a clamp 33 is provided at an intermediate portion thereof.

  The clamp 33 holds and holds the cable 13 and has a base 33a and a clamp portion 33b as shown in FIG. The base 33 a is provided integrally with the bracket 32 and extends toward the cable 13. A semicircular seat 33c having a diameter substantially the same as the outer diameter of the cable 13 is formed at the distal end of the base 33a, and the cable 13 can be placed on the seat 33c. A clamp portion 33b is provided at the front end where the seat 33c is formed so as to cover it. The clamp portion 33b is formed with a semicircular clamp groove 33d having a diameter substantially the same as the outer diameter of the cable 13. When the clamp portion 33b is disposed at a predetermined position of the distal end portion of the base 33a, the clamp groove 33d is formed. The cable 13 is fitted in 33d. Furthermore, the clamp part 33b is fixed at the predetermined position by a fastener such as a bolt at the tip of the base 33a.

  That is, by fixing the clamp part 33b to the base 33a at a predetermined position, the cable 13 is sandwiched between the base seal 33a and the clamp part 33b between the internal seal structure 20 and the socket 27, and the clamp member 31 The cable 13 is held and retained. Thereby, even if the internal pressure explosion-proof container 2 vibrates due to vibration during driving of the robot, the cable does not move, and the cable 13 does not come off due to the vibration, and the plug 26 does not fall off from the socket 27. Further, since the cable 13 is held by the clamp member 31, even if a person's foot is caught on the cable 13 or an object falls and the cable 13 is pulled, the cable 13 may be pulled out, The plug 26 does not fall off from the socket 27. Therefore, the connection state between the socket 27 and the plug 26 can be kept good. That is, it is possible to prevent the electric motor 7 and the external power source from being electrically disconnected due to the cable 13 being disconnected or the plug 26 being dropped from the socket 27 (contact failure of the connector 25). Thereby, it is possible to prevent the robot from being stopped due to the disconnection of the cable 13 or the contact failure of the connector 25.

  Further, by fixing the clamp member 31 to the connector casing 11, the clamp member 31 vibrates in the same manner as the connector casing 11 when the connector casing 11 vibrates. In the cable 13, the relative vibration between the portion inserted into the connector casing 11 and the portion held by the clamp member 31 is reduced, and the relative vibration between the plug 26 and the socket 27 during vibration can be suppressed. As a result, it is possible to prevent the plug 26 from being removed from the socket 27 due to this relative vibration, and the external power supply and the electric drive device are prevented from being electrically disconnected, thereby causing the industrial robot to stop suddenly. Can be prevented.

  Further, since the cable 13 is held at a portion between the inner seal structure 20 and the plug 26, the cable 13 is held at a location closer to the plug 26. Thereby, when the robot is driven, the swing width of the portion of the cable 13 on the plug 26 side can be further reduced. As a result, the relative vibration between the plug 26 and the socket 27 is further reduced, and it is further suppressed that the plug 26 is detached from the socket 27 due to the relative vibration and the external power source and the electric drive device are electrically disconnected. be able to. Further, disconnection of the wiring 13c caused by relative vibration between the plug 26 and the cable 13 can be suppressed. The disconnection of the wiring 13c is prevented by bending the wiring 13c between the plug 26 and the sheath 13b so that even if the cable 13 moves somewhat, the movement can be absorbed by the bending of the wiring 13c. .

  A plug fixing portion 34 is further provided at the tip of the bracket 32 where the clamp 33 is provided. A plurality of holes (not shown) (for example, the same number of holes as the pins 26b) are formed in the plug fixing portion 34, and the back side surface of the plug 26 is fixed to the front side surface (the lower surface in FIG. 3). The back side faces the tip of the sheath 13 b of the cable 13. From the sheath 13b, the tip side portion of the wire 13c is projected to connect the wire 13c to the pin 26b, and this tip side portion is inserted into each hole from the back side surface of the plug fixing portion 34 to each pin 26b of the plug 26. It is connected to the. As shown in FIGS. 2 and 3, the tip end portion is connected with a margin to the corresponding pin 26b in a bent state so that the wiring 13c is not disconnected due to vibration or the like.

  When the connector casing 11 is fixed at a predetermined position on the outer wall of the internal pressure explosion-proof container 2, the plug 26 fixed to the plug fixing portion 34 is inserted into the through hole 8 and fitted into the socket 27. It is designed to be electrically connected. That is, the plug 26 is fitted into the socket 27 by inserting the clamp member 31 into the through hole 8 while moving the connector casing 11 so as to be disposed at a predetermined position on the outer wall of the internal pressure explosion-proof container 2. It is electrically connected to the socket 27. Therefore, the fitting condition between the plug 26 and the socket 27 can be confirmed by fixing the connector casing 11 to the internal pressure explosion-proof container 2 while confirming the position of the connector casing 11, and the fitting condition between the plug 26 and the socket 27 can be confirmed. There is no need to form a hole or the like for the purpose, and the connection between the plug 26 and the socket 27 is simple. Conversely, by removing the connector casing 11 from the internal pressure explosion-proof container 2, the plug 26 and the socket 27 are separated. Therefore, the plug 26 and the socket 27 can be easily separated.

  The socket hole 27a is tapered, and the opening diameter thereof is larger than the outer diameter of the pin 26b. Therefore, when the plug 26 is fitted into the socket 27, even if the shafts of the socket hole 27a and the pin 26b are displaced from each other, they are guided by the socket hole 27a so that the shafts are aligned. Therefore, even if the position where the connector casing 11 is fixed is slightly shifted, the pin 26b is guided by the socket hole 27a, and the plug 26 and the socket 27 can be connected. Thereby, an external power supply and the electric motor 7 can be connected reliably.

  Further, since the socket 27 is fixed to the mounting plate 29, when the connector casing 11 is attached to the internal pressure explosion-proof container 2, the wiring 28 connecting the socket 27 and the electric motor 7 is not dragged. The wiring 28 does not interfere with a configuration (not shown) provided in the internal pressure explosion-proof container 2. Therefore, disconnection and short circuit of the wiring 28 can be prevented. Since the plug 26 is fixed to the clamp member 31 and the cable 13 is held by the clamp member 31, the wiring 13c of the cable 13 is not similarly dragged or interferes with other wirings 13c. Therefore, disconnection or short circuit of the wiring 13c of the cable 13 can be prevented.

Second Embodiment
In the internal pressure explosion-proof structure 1 configured as described above, a clamp 131 as shown in FIG. 6A can be used instead of the clamp member 31. The clamp member 131 is similar in configuration to the clamp member 31, and the same components are denoted by the same reference numerals and description thereof is omitted. The clamp member 31 includes a bracket 32, a clamp 133, and a plug fixing portion 34. The clamp 133 includes a connecting portion 133a and a clamp portion 133b as shown in FIG. A base end portion of the connecting portion 133a is provided integrally with the bracket 32, and a clamp portion 133b is provided at the distal end portion. The clamp part 133b has a circular arc part 133c formed in a C-shape and two fixed parts 133d provided respectively at the ends of the circular arc part.
The arc portion 133c can pass the cable 13 therein, and the fixed portion 133d extends in parallel to the connecting portion 133a. The clamp part 133b is made of a material having flexibility, and can deform the arc part 133c. When the clamp part 133b is deformed so as to match the fixed part 133d, the cable 13 is clamped by the arc part 133c. When the two fixing portions 133d are fixed with a fastener such as a bolt while the cable 13 is sandwiched, the cable 13 is held by the clamp portion 133b. Since the arc portion 133c covers and covers the entire circumference of the cable 13, the pressure acting on the outer peripheral surface of the cable 13 during the clamping is substantially uniform. Therefore, the cable 13 is held without being flattened. That is, even if the clamping force (holding force) of the clamp 133 is increased, the cable 13 is not bent and flattened, and disconnection of the wiring 13c can be suppressed. Therefore, the cable 13 can be held and fastened with a large clamping force (holding force), and the cable 13 can be further prevented from being pulled out.

<Third Embodiment>
The internal pressure explosion-proof structure 1B of the third embodiment is similar in configuration to the internal pressure explosion-proof structure 1 of the first embodiment. Below, about the structure of the internal pressure explosion-proof structure 1B of 3rd Embodiment, a different point from the structure of the internal pressure explosion-proof structure 1 of 1st Embodiment is demonstrated, the same code | symbol is attached | subjected about the same structure, and description is abbreviate | omitted. In the internal pressure explosion-proof structure 1B, as shown in FIG. 7, the clamp member 31B is disposed in the insertion hole 11c of the connector casing 11B, and is formed integrally with the connector casing 11B. Thereby, the clamp member 31 </ b> B is disposed between the retaining mechanism 15 and the inner seal structure 20.

  The clamp member 31B includes a base 33a and a clamp part 33b, and the clamp 33 is configured by the base 33a and the clamp part 33b. The base 33a is provided integrally with the connector casing 11B, and the cable 13 is placed on a seat 33c of the base 33a. The connector casing 11B is formed with a viewing hole 11f, and the clamp portion 33b can be inserted into the insertion hole 11c from the viewing hole 11f. The clamp part 33b inserted from here is put on the base 33a on which the cable 13 is placed and fixed. The cable 13 is hold | maintained by the base 33a and the clamp part 33b by fixing. Note that the peep hole into which the clamp portion 33 b is inserted is closed by the lid member 40.

  The internal pressure explosion-proof structure 1B configured in this way has the same operational effects as the internal pressure explosion-proof structure 1 of the first embodiment.

  In the first to third embodiments, the electric motor 7 is shown as an example of the electric drive device accommodated in the internal pressure explosion-proof container 2, but the electric drive device accommodated is not limited to the electric motor 7, and the electromagnetic valve An electropneumatic valve or a control board may be used as long as it is electrically driven.

  In the first to third embodiments, the plug 26 and the clamp member 31 are formed separately, but may be formed integrally.

  The present invention is not limited to the embodiments, and can be added, deleted, and changed without departing from the spirit of the invention.

  As described above, the present invention provides a connector for an internal pressure explosion-proof container for electrically connecting an electric drive device in an internal pressure explosion-proof container provided in an industrial robot and an external power source outside the internal pressure explosion-proof container. The present invention can be applied to an apparatus and an industrial robot including the apparatus.

DESCRIPTION OF SYMBOLS 2 Internal pressure explosion-proof container 7 Electric motor 8 Through-hole 10 Connector apparatus 11, 11B Connector casing 13 Cable 13a Exposed part 13b Sheath 13c Wiring 14 Protective exterior 15 Holding mechanism 20 Internal seal structure 25 Connector 26 Plug 27 Socket 27a Socket hole 31 131 clamp members

Claims (7)

An electrical drive device in an internal pressure explosion-proof container provided in the industrial robot, and a connector capable of electrically connecting and disconnecting an external power supply outside the internal pressure explosion-proof container;
A connector casing that closes a through-hole formed in the internal pressure explosion-proof container to expose the connector from the internal pressure explosion-proof container;
A cable for inserting the connector casing and connecting the connector and an external power source;
A connector device for an internal pressure explosion-proof container, comprising: a clamp member that is fixed in the connector casing and holds the cable. The connector has an electric drive side contact and an external power source side contact that can be connected to and disconnected from each other,
The electric drive device side contact is connected to the electric drive device and fixed to the internal pressure explosion-proof container,
2. The connector device for an internal pressure explosion-proof container according to claim 1, wherein the external power supply side contact is connected to an external power supply via a cable and is provided on the clamp member.   3. The connector for an internal pressure explosion-proof container according to claim 1, wherein the clamp member holds the cable so that the pressure acting on the outer peripheral surface of the cable is substantially uniform. apparatus. A protective sheath that is provided on the exposed portion of the cable out of the connector casing and covers the exposed portion;
A retaining mechanism that is provided at an outer opening of an insertion hole formed in the connector casing so that the cable is inserted, and that retains the protective sheath;
Provided in the inner opening of the insertion hole, with an internal seal structure to prevent gas entering between the connector casing and the cable,
The connector apparatus for an internal pressure explosion-proof container according to any one of 1 to 3, wherein the connector casing is fixed to the internal pressure explosion-proof container in a state where sealing is achieved.   5. The connector device for an internal pressure explosion-proof container according to claim 1, wherein the clamp member is configured to hold between the internal seal structure and the connector. 6. The cable has a plurality of wirings and a sheath covering the plurality of wirings,
6. The internal pressure explosion-proof container according to claim 1, wherein tips of the plurality of wires are exposed from the sheath and connected to the connector in a bent state. Connector device.   An industrial robot comprising the connector device according to claim 1 and the internal pressure explosion-proof container.

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