JP6795947B2 - Explosion-proof equipment - Google Patents

Description

The present disclosure relates to explosion-proof equipment used in an explosive atmosphere.

Explosion-proof equipment with explosion-proof measures is used in disaster prevention support work and building maintenance work in an explosive atmosphere from the viewpoint of industrial security. In explosion-proof equipment, various electrical parts are stored inside an explosion-proof casing with specified specifications, and explosion-proof measures are taken to prevent the electric sparks and high-temperature parts of these electrical parts from becoming an ignition source for an explosive atmosphere during use. It has been subjected.
It should be noted that such an explosion-proof specification is formulated as a standard such as the International Harmonized Explosion-Proof Guideline 2008Ex described in Non-Patent Document 1.

When using an explosion-proof device, it is necessary to perform power supply (charging) work from the outside in order to cover the electric power consumed by the electric components housed in the explosion-proof casing. Even in such power supply work, explosion-proof measures are taken so as not to serve as an ignition source for the surrounding explosive atmosphere. As an example of a power supply system in which explosion-proof measures are taken, for example, Patent Document 1 discloses an explosion-proof device using non-contact power supply. In this document, in an explosion-proof device that is an electric self-propelled vehicle that can move along a rail including a feeder line, it is housed in a coil housing portion by utilizing an electromagnetic induction phenomenon that occurs between the current flowing through the feeder line. It is described that an electromotive force is generated in the pickup coil to supply power.

JP-A-2009-11044

Japan Electric Control Equipment Manufacturers Association Explosion Proof Committee "Explosion Proof Safety Guidebook (Explosion Proof Electrical Equipment Inspection Guide for Equipment Safety)"

A conductive material such as metal is typically used for the explosion-proof casing, but in the non-contact type feeding as in Patent Document 1, electromagnetic induction is performed between the feeding line of the feeding source and the pickup coil of the feeding destination. At least part of it should be made of non-metallic material so as not to interfere. As a non-metallic material that can be used for explosion-proof equipment, for example, plastic can be considered. However, since plastic has a risk from another viewpoint that static electricity, which can be an ignition source, is likely to be generated by charging, the area occupied by the explosion-proof casing may be limited even in the explosion-proof standard. Further, glass can be considered as another non-metal material used for the explosion-proof casing, but in order to secure the strength of the explosion-proof casing, it is preferable that the ratio of the glass used is small.

Further, as described above, it is preferable that the non-metal material is used in a small proportion in the explosion-proof casing, but if the non-metal material is used in a narrow area, the magnetic flux density in the area becomes large when sufficient charging performance is to be ensured. This can increase the risk of being an ignition source for explosive atmospheres.

At least one embodiment of the present invention has been made in view of the above circumstances, and an object of the present invention is to provide an explosion-proof device capable of supplying power to electrical components housed inside an explosion-proof casing from the outside.

(1) Explosion-proof equipment according to at least one embodiment of the present invention is used to solve the above problems.
Explosion-proof casing and
The generator provided in the explosion-proof casing and
A power transmission unit that can transmit mechanical power from an external power source to the generator,
To be equipped.

According to the configuration of (1) above, the mechanical power from the external power source is input to the generator provided in the explosion-proof casing via the power transmission unit. The generator is driven by the input mechanical power to generate the required electrical energy in the electrical components housed in the explosion-proof casing. In this way, the explosion-proof equipment is supplied with power by an external power source, but only the mechanical energy is exposed to the external explosive atmosphere, and the electrical energy generated by the generator is not exposed. Therefore, it is possible to supply power from the outside while effectively suppressing the ignition risk for the explosive atmosphere.
The external power source may be a power device such as a motor having an explosion-proof specification that can be installed in an explosive atmosphere, or may be a worker who works in an explosive atmosphere.

(2) In some embodiments, in the configuration of (1) above,
The power transmission unit includes a coupling capable of mechanically or magnetically transmitting the torque of the power source to the generator.

According to the configuration (2) above, the torque output from the external power source is transmitted to the inside of the explosion-proof casing through the coupling forming a mechanical or magnetic coupling. Therefore, electrical energy having a large ignition risk is not exposed to the explosive atmosphere, and good explosion-proof performance can be obtained.

(3) In some embodiments, in the configuration of (2) above,
The power transmission unit
A shaft member provided so as to penetrate the inside and outside of the explosion-proof casing and capable of transmitting the torque of the power source to the generator.
A sealing member that rotatably supports the shaft member with respect to the explosion-proof casing and seals the explosion-proof casing to the outside.
including.

According to the configuration of (3) above, the torque from the power source is transmitted to the generator inside the explosion-proof casing via the shaft member penetrating the inside and outside of the explosion-proof casing. A sealing member is provided at a portion of the explosion-proof casing through which the shaft member penetrates, and the shaft member is rotatably supported with respect to the explosion-proof casing and the explosion-proof casing is sealed to the outside.

(4) In some embodiments, in the configuration of (3) above,
An engaging portion with which the power source can be engaged is provided at an outer end portion of the shaft member of the explosion-proof casing.

According to the configuration (4) above, an external power source is engaged with the engaging portion provided at the end of the shaft member on the outside of the explosion-proof casing. As a result, mechanical power is input from an external power source to the generator inside the explosion-proof casing via the shaft member.

(5) In some embodiments, in the configuration of (3) above,
A traveling wheel of the explosion-proof device is provided at the outer end of the shaft member of the explosion-proof casing.

According to the configuration of (5) above, the generator can be driven via the power transmission mechanism by driving the traveling wheels by an external power source at the time of power supply. On the other hand, by supplying electric power to the generator and powering it, the generator can function as a traveling power source (that is, a traveling motor). In this case, since the generator and the traveling motor can be shared by the same electric motor, it is advantageous in simplifying the structure of the explosion-proof device and reducing the cost. Further, as compared with the case where the generator and the traveling motor are provided separately, the number of shaft members penetrating the inside and outside of the explosion-proof casing can be suppressed, which is effective in improving the explosion-proof performance.

(6) In some embodiments, in the configuration of (2) above,
The power transmission portion is a magnetic coupling including a pair of engaging portions that are arranged inside and outside the explosion-proof casing so as to face each other and form a magnetic coupling.

According to the configuration (6) above, the mechanical power from the external power source is transmitted to the generator inside the explosion-proof casing via the magnetic coupling. Since the magnetic coupling can form a coupling state in a non-contact manner, it is not necessary to provide a hole structure penetrating the explosion-proof casing, which is effective in improving the airtightness and the explosion-proof performance of the explosion-proof casing.

According to at least one embodiment of the present invention, it is possible to provide an explosion-proof device capable of supplying power to an electric component housed inside the explosion-proof casing from the outside.

It is a side sectional view which shows schematic structure of the explosion-proof equipment which concerns on the related technology. It is a side sectional view which shows schematic structure of the explosion-proof device which concerns on 1st Embodiment of this invention. This is a modified example in which a magnetic coupling is used for the power transmission unit of FIG. It is a side sectional view which shows schematic structure of the explosion-proof device which concerns on 2nd Embodiment of this invention.

Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the present invention to this, but are merely explanatory examples. Absent.
For example, expressions that represent relative or absolute arrangements such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric" or "coaxial" are exact. Not only does it represent such an arrangement, but it also represents a state of relative displacement with tolerances or angles and distances to the extent that the same function can be obtained.
Further, for example, an expression representing a shape such as a quadrangular shape or a cylindrical shape not only represents a shape such as a quadrangular shape or a cylindrical shape in a geometrically strict sense, but also includes a concavo-convex portion or a concavo-convex portion within a range in which the same effect can be obtained. The shape including the chamfered portion and the like shall also be represented.
On the other hand, the expressions "equipped", "equipped", "equipped", "included", or "have" one component are not exclusive expressions that exclude the existence of other components.

<Related technology>
First, with reference to FIG. 1, related techniques that are the premise of the embodiments described later will be described. FIG. 1 is a side sectional view schematically showing the structure of the explosion-proof device 1 according to the related technology.

The explosion-proof device 1 is an industrial robot capable of invading an explosive atmosphere by self-propelling and performing or supporting various tasks such as disaster prevention support work and building maintenance work. Such a working environment includes a wide range of fields where explosive expectations may exist, such as petroleum / scientific plants, manufacturing / handling of hazardous materials such as flammable liquids, painting equipment, and solvent-using workshops. , High pressure gas equipment, fuel cell related facilities, etc.

The explosion-proof device 1 has a hollow-shaped explosion-proof casing 2 that constitutes the main body. The explosion-proof casing 2 is kept confidential by isolating the inside of the explosion-proof casing 2 from the outside (explosive atmosphere). The explosion-proof casing 2 has an internal pressure explosion-proof structure in which an inert gas having a higher pressure than the external pressure of the explosion-proof casing 2 is sealed, so that the surrounding explosive atmosphere is prevented from entering the inside of the explosion-proof casing 2. There is.

The detailed specifications of the internal pressure explosion-proof structure are based on the International Consistency Explosion-Proof Guideline 2008Ex (specifically, refer to Non-Patent Document 1 above). In addition, if the guideline is revised in the future, the terms used in the present specification shall also be interpreted based on the revised content.

The explosion-proof device 1 may be provided with a gas supply device for filling the inside of the explosion-proof casing 2 with an inert gas. For example, as in Japanese Patent No. 2796482, the structure may be such that the inert gas can be supplied to the explosion-proof casing 2 from the inert gas source independently provided outside the explosion-proof device 1 via the air pipe. Alternatively, as in Japanese Patent Application Laid-Open No. 2015-36172, the explosion-proof device 1 is equipped with a tank in which the inert gas is stored, and the tank has a structure in which the inert gas can be supplied to the inside of the explosion-proof casing 2. You may. Further, the internal pressure of the explosion-proof casing 2 may be adjustable by providing the explosion-proof casing 2 with a discharge mechanism for discharging the inert gas inside.

The explosion-proof device 1 is a traveling body that can be moved by having traveling wheels 4 on the front, rear, left and right sides of the explosion-proof casing 2 (in FIG. 1, only two traveling wheels 4 on one side are shown). A driving force is transmitted from the traveling motor 6 housed inside the explosion-proof casing 2 to at least one of the traveling wheels 4 via the drive shaft 6a, so that the traveling wheel 4 can travel on the field.
In addition, instead of the traveling wheel 4, another traveling means such as a crawler may be adopted.

Various electric parts including the above-mentioned traveling motor 6 are housed inside the explosion-proof casing 2. These electric components are operated by supplying electrical energy, but since the power supply circuit may be an ignition source for an explosive atmosphere, they are housed in the explosion-proof casing 2 to prevent the explosive atmosphere. It is isolated. In FIG. 1, in addition to the above-mentioned traveling motor 6, a battery 8 for storing electricity, a charging unit 12 for charging from an external non-contact power supply facility 10, and a charging unit are shown as a part of these electric components. A substation 14 for substituting the electric power supplied to the battery 8 to charge the battery 8 and a controller 16 as a control unit are shown.

The battery 8 is a lithium ion secondary battery having a relatively large energy density, and is configured by connecting a plurality of secondary battery cells in series. In these plurality of secondary battery cells, state parameters such as charge amount, current amount, and temperature are managed by a management device (so-called BMU: Battery Management Unit) (not shown). Electric power for driving various electric components is stored in the battery 8, and electric power is supplied to each electric component including the traveling motor 6 based on the instruction of the controller 16. Then, when the charge amount of the battery 8 is insufficient, as shown in FIG. 1, the explosion-proof device 1 moves to the non-contact power supply facility 10 installed on the field and charges the battery 8 by performing the charging operation. Amount recovery is done.

The charging unit 12 is configured to enable non-contact power feeding by electromagnetic induction with the non-contact power feeding facility 10. The non-contact power supply facility 10 includes an explosion-proof casing 18 designed to be explosion-proof, similar to the explosion-proof casing 2 of the explosion-proof device 1. Inside the explosion-proof casing 18, a power feeding unit 22 having a coil 20 to which a high-frequency current is supplied and a controller 24 for controlling the non-contact power feeding equipment 10 are provided.
The electric power required for the operation of the non-contact power supply facility 10 (including the electric power supplied to the coil 20) is supplied from the power source 17 outside the explosive atmosphere via the power supply line 19 provided with explosion-proof measures. To.

A high frequency current is supplied to the coil 20 of the power feeding unit 22 based on the instruction of the controller 24. The explosion-proof casings 2 and 18 are mainly formed of a conductive material such as metal, but a part of the regions facing each other (regions 32 and 34) are partially formed of a non-metal material. Since a conductive material such as metal has an electromagnetic shielding effect, electromagnetic waves cannot pass through, but electromagnetic waves can pass through the regions 32 and 34 made of non-metal materials. Therefore, when a high-frequency current is supplied to the coil 20, AC electromotive force due to electromagnetic induction is generated in the pickup coil 26 of the charging unit 12 via the regions 32 and 34. The AC electromotive force generated in the pickup coil 26 in this way is converted into a predetermined DC voltage by the substation unit 14 and charged in the battery 8.
The substation 14 is a device for performing power conversion necessary for charging the battery 8 such as an inverter or a DC-DC converter.

Further, the explosion-proof device 1 and the non-contact power supply facility 10 are provided with communication antennas 28 and 30 capable of communicating with each other inside the explosion-proof casings 2 and 18, respectively. These communication antennas 28 and 30 are also configured to be able to communicate with each other by transmitting and receiving communication radio waves via regions 32 and 34 made of non-metal materials. As a result, the explosion-proof device 1 and the non-contact power supply facility 10 manage the charging work to the battery 8 by performing various controls such as the start and end of the charging work while recognizing the positional relationship with each other. To.

Here, as the non-metal material used in the regions 32 and 34, for example, a material such as plastic or glass can be considered. However, since a material such as plastic tends to generate static electricity that can be an ignition source for charging, the area occupied on the outer surface of the explosion-proof device 1 may be limited even in the explosion-proof standard. Therefore, if the proportion of the regions 32 and 34 in the explosion-proof casings 2 and 18 is reduced, electromagnetic induction must be performed through a limited area. Therefore, in order to secure a certain power feeding speed, the electromagnetic waves in the region It is necessary to increase the strength. Then, as the intensity of the electromagnetic wave increases, the risk of becoming an ignition source for an explosive atmosphere increases. Further, a material such as glass has a lower strength than a metal material. Problems in such related technologies can be solved by the embodiments described below.

<First Embodiment>
FIG. 2 is a side sectional view schematically showing the configuration of the explosion-proof device 100 according to the first embodiment of the present invention. In the following description, common reference numerals will be given to the configurations corresponding to the above-mentioned background techniques, and duplicate descriptions will be appropriately omitted unless there are special circumstances.

In this embodiment, a generator 36 that can be driven by mechanical power from an external power source is provided in the explosion-proof casing 2 of the explosion-proof device 100. The generator 36 is a rotary machine that generates electricity by converting mechanical energy into electrical energy by being driven by mechanical power input from an external power source. Further, FIG. 2 shows a drive motor 38 installed on the field as an external power source and satisfying the explosion-proof specifications. The mechanical power output from the drive motor 38 is input to the generator 36 via the power transmission unit 40. The power transmission unit 40 includes a coupling capable of mechanically or magnetically transmitting the torque of the drive motor 38, which is a power source, to the generator 36.

In FIG. 2, as an example of the power transmission unit 40, a mode using a coupling capable of mechanically transmitting the torque of the drive motor 38 to the generator 36 is shown. The input shaft (shaft) 36a of the generator 36 housed in the explosion-proof casing 2 extends to the outside of the explosion-proof casing 2 so as to penetrate the wall surface of the explosion-proof casing 2 in and out. A through hole is formed in the wall surface of the explosion-proof casing 2 through which the input shaft 36a penetrates, and a sealing member 44 is arranged so as to fill a gap between the through hole and the input shaft 36a. As a result, the input shaft 36a is rotatably supported with respect to the explosion-proof casing 2, and the confidentiality of the explosion-proof casing 2 is ensured.

An engaging portion 36b is provided at the tip of the input shaft 36a. The engaging portion 36b is configured to be engageable with the engaging portion 38b formed at the tip of the output shaft 38a of the drive motor 38. The engaging portions 36b and 38b have shapes that can be engaged with each other, and form a mechanical coupling. In the present embodiment, the engaging portions 36b and 38b each have an uneven shape that can be engaged with each other, but it goes without saying that the shape is not limited to such a shape.

The explosion-proof device 100 traveling on the field travels so as to move to the position where the drive motor 38 is arranged, as shown in FIG. 2, when the charge amount of the battery 8 becomes low. Then, the engaging portion 36b on the explosion-proof device 100 side is connected to the engaging portion 38b on the drive motor 38 side. At this time, the input shaft 36a of the generator 36 and the output shaft 38a of the drive motor 38 are coaxially connected to each other, and then the drive motor 38 is driven to generate torque generated by the drive motor 38. It is input to the generator 36 to generate electricity.

As described above, in FIG. 2, the power transmission unit 40 includes a mechanical coupling, but it may include a magnetic coupling as shown in FIG. FIG. 3 is a modified example in which a magnetic coupling is used for the power transmission unit 40 of FIG.

In the example of FIG. 3A, engaging portions 36b provided at the tip of the input shaft 36a of the generator 36 and the tip of the output shaft 38a of the drive motor 38 are provided on both sides of the wall surface of the explosion-proof casing 2. The engaging portions 38b are arranged so as to face each other. The engaging portions 36b and 38b each have a plate shape facing the wall surface of the explosion-proof casing 2. Magnets 46 and 47 having different magnetic poles are embedded in the engaging portions 36b and 38b, respectively. The magnets 46 and 47 may be permanent magnets or electromagnets.

By arranging the magnets 46 and 47 having different magnetic poles facing each other across the wall surface of the explosion-proof casing 2, a magnetic coupling is formed, and the input shaft 36a of the generator 36 and the drive motor 38 The output shaft 38a is coaxially connected to each other. When the drive motor 38 is driven, the torque generated by the drive motor 38 is input to the generator 36 to generate electricity. Since it is not necessary to form a through hole as shown in FIG. 2 in the explosion-proof casing 2 in such a magnetic coupling, the airtightness of the explosion-proof casing 2 can be effectively ensured.

By arranging the magnets 46 and 47 symmetrically about the rotation axes of the input shaft 36a and the output shaft 38a, respectively, an even coupling force can be obtained when the engaging portions 36b and 38b are engaged. It is arranged like this. Further, the magnets 46 and 47 may have a ring shape extending along the circumferential direction of the rotation axis, or the ring shape may be divided into a plurality of rings along the circumferential direction.

Further, in the example of FIG. 3B, a tip portion 38b having a substantially cylindrical shape having a diameter larger than that of the output shaft 38a is provided at one end of the output shaft 38a of the drive motor 38. A magnet 46 is embedded in the peripheral surface of the tip portion 38b along the circumferential direction. On the other hand, the explosion-proof casing 2 constituting the explosion-proof device 100 is provided with a recess 48 into which the tip portion 38b can be inserted. The inner wall of the recess 48 is formed as a substantially cylindrical cavity having a diameter larger than that of the tip 38b, and when the tip 38b is inserted, there is not a little gap between the recess 48 and the outer surface of the tip 38b. Designed to exist.

Inside the explosion-proof casing 2, a tip portion 36b provided at the tip of the input shaft 36a of the generator 36 is arranged. The tip portion 36b has a substantially C-shaped cross-sectional shape so as to surround the recess 48 from the inside of the explosion-proof casing 2. A magnet 47 is embedded in the tip portion 36b at a position facing the magnet 46 on the tip portion 38b side via an explosion-proof casing 2. As described above, the magnets 46 and 47 arranged so as to face each other with the wall surface of the explosion-proof casing 2 sandwiched between them have different magnetic poles and form a magnetic coupling. As a result, the input shaft 36a of the generator 36 and the output shaft 38a of the drive motor 38 are coaxially connected to each other. When the drive motor 38 is driven in this way, the torque generated by the drive motor 38 is input to the generator 36 to generate electricity. Since it is not necessary to form a through hole as shown in FIG. 2 in the explosion-proof casing 2 in such a magnetic coupling, the airtightness of the explosion-proof casing 2 can be effectively ensured.

In the present embodiment, the case where the drive motor 38 is used as the external power source has been described, but such a power source is not limited to the device, and may be, for example, the worker himself / herself. In this case, the operator may directly or manually drive the input shaft 36a of the generator 36, or may indirectly drive the input shaft 36a using a predetermined tool held by the worker.

When mechanical power is input to the generator 36 via the power transmission unit 40 in this way, power is generated by the generator 36, and the power generated by the generator 36 is stored in the battery 8 via the substation 14. Will be done. When the charging of the battery 8 is completed, the electric power stored in the battery 8 is supplied to various electric components housed in the explosion-proof casing 2 as needed, and the explosion-proof device 1 is operated.

<Second Embodiment>
Subsequently, FIG. 4 is a side sectional view schematically showing the configuration of the explosion-proof device 200 according to the second embodiment of the present invention. In FIG. 4, common reference numerals are given to the configurations corresponding to the above-mentioned related techniques and the first embodiment, and duplicate descriptions are appropriately omitted unless there are special circumstances.

In this embodiment, a part of the floor surface of the field is configured as a movable conveyor 50. The conveyor 50 is configured such that the ring-shaped conveyor belt 56 comes into contact with the pair of pulleys 52 and 54 arranged at both ends thereof from the outside. The pulley 52 is a drive pulley, and the output shaft of the motor 58 is connected to the rotation shaft thereof. When the motor 58 is driven, the torque is transmitted to the pulley 52, and the conveyor belt 56 is rotationally driven. On the other hand, the pulley 54 is a driven pulley, and is driven by a conveyor belt 56 driven by the rotation of the pulley 52.

As described above, the explosion-proof device 200 has traveling wheels 4 that can be driven by the traveling motor 6 housed in the explosion-proof casing 2. The traveling wheel 4 is connected to the traveling motor 6 via a drive shaft 6a, and the traveling motor 6 is driven (powered) by the electric power stored in the battery 8 during traveling, so that the traveling motor 6 is driven. The torque of the above is transmitted to the traveling wheels 4 via the drive shaft 6a, and the explosion-proof device 200 travels.

On the other hand, when it becomes necessary to charge the battery 8 due to a decrease in the charge amount of the battery 8, the explosion-proof device 200 is moved onto the conveyor 50, and the conveyor 50 is driven by the motor 58. At the time of charging, the traveling motor 6 is in a non-driving state (that is, the controller 16 stops the power supply from the battery 8 to the traveling motor 6), and the traveling wheels 4 are passively driven by the conveyor belt 56.

When the traveling wheel 4 is driven by the conveyor belt 56, the traveling motor 6 is driven via the drive shaft 6a to generate electricity. That is, when the traveling motor 6 is regeneratively driven, the traveling motor 6 functions as a generator. As a result, the mechanical energy input from the conveyor belt 56 is converted into electrical energy. The electric power generated by the traveling motor 6 is stored in the battery 8 via the substation 14.

In the present embodiment, since the traveling motor 6 functions as a generator as described above, the generator 36 is installed in the explosion-proof casing 2 separately from the traveling motor 6 as described in the first embodiment described above. Compared with the case, the weight can be reduced by simplifying the device configuration, which is also advantageous in terms of cost. Further, as shown in FIG. 2, it is not necessary to form a through hole in the explosion-proof casing 2 for penetrating the input shaft 36a for inputting power separately from the drive shaft 6a of the traveling wheel 4, and the explosion-proof casing 2 is confidential. It is advantageous for improving the sex.

The traveling motor 6 may be configured as a so-called in-wheel motor by being stored inside the traveling wheel 4.

As described above, according to the present embodiment, the mechanical power from the external power source is input to the generator 36 (or the traveling motor 6) provided in the explosion-proof casing 2 via the power transmission unit 40. Will be done. The generator 36 is driven by the input mechanical power to generate the electric energy required for the electric components housed in the explosion-proof casing 2. In this way, power is supplied to the explosion-proof equipment by an external power source, but only mechanical energy is exposed to the external explosive atmosphere, and electricity generated by the generator 36 (or the traveling motor 6) is generated. No target energy is exposed. Therefore, it is possible to supply power from the outside while effectively suppressing the ignition risk for the explosive atmosphere.

At least one embodiment of the present invention is available for explosion-proof equipment used in an explosive atmosphere.

1,100,200 Explosion-proof equipment 2,18 Explosion-proof casing 4 Traveling wheel 6 Traveling motor 8 Battery 10 Non-contact power supply equipment 12 Charging unit 14 Substation 16 Controller 17 Power supply 19 Power supply line 20 Coil 22 Power supply unit 26 Pickup coil 28, 30 Communication antenna 36 Generator 38 Drive motor 40 Power transmission part 42 Through hole 44 Sealing member 46, 47 Magnet 48 Recess 50 Conveyor 52, 54 Pulley 56 Conveyor belt 58 Motor

Claims (6)

Explosion-proof equipment that can run on the field
Explosion-proof casing and
The generator provided in the explosion-proof casing and
A power transmission unit capable of transmitting mechanical power to the generator from an input shaft that can engage with the output shaft of an external power source installed on the field .
Explosion-proof equipment equipped with. The explosion-proof device according to claim 1, wherein the power transmission unit includes a coupling capable of mechanically or magnetically transmitting the torque of the power source to the generator. The power transmission unit
A shaft member provided so as to penetrate the inside and outside of the explosion-proof casing and capable of transmitting the torque of the power source to the generator.
A sealing member that rotatably supports the shaft member with respect to the explosion-proof casing and seals the explosion-proof casing to the outside.
2. The explosion-proof device according to claim 2. The explosion-proof device according to claim 3, wherein an engaging portion with which the power source can be engaged is provided at an outer end portion of the shaft member on the outside of the explosion-proof casing. The explosion-proof device according to claim 3, wherein a traveling wheel of the explosion-proof device is provided at an outer end of the explosion-proof casing of the shaft member. The explosion-proof device according to claim 2, wherein the power transmission unit is a magnetic coupling including a pair of engaging portions that are arranged so as to face each other inside and outside the explosion-proof casing and form a magnetic coupling.

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