Explosion-proof control device

Abstract

To provide a pressure-proof and explosion-proof control device that can simplify the configuration and adjustment work of an electro-fluid conversion section.SOLUTION: A pressure-proof and explosion-proof control device 10 is installed in an explosion-proof pressure-proof vessel 11 installed in an explosion-proof atmosphere and controls a scale 80 operating in an explosion-proof atmosphere. The pressure-proof and explosion-proof control device 10 includes a solenoid 21 with a plunger 24 and a rod 30 formed on the plunger 24. The rod 30 is provided through the pressure-proof vessel 11 and moves in a straight line by driving the plunger 24 to activate an external switch 50.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a pressure-resistant explosion-proof control device that is installed in an explosion-proof pressure vessel installed in an explosion-hazardous atmosphere and controls devices that operate in the explosion-hazardous atmosphere. [Background technology]

[0002] Conventionally, this type of pressure-resistant explosion-proof control device is as shown in Patent Document 1. The pressure-resistant explosion-proof control device of Patent Document 1 is an explosion-proof pressure container installed in an explosive atmosphere, in which electrical components are installed for controlling a fluid-operated device that operates using a working fluid in the explosive atmosphere.

[0003] The pressure-resistant explosion-proof control device of Patent Document 1 includes an electric-fluid converter for outputting an electric signal inside a pressure-resistant container to the outside of the pressure-resistant container as a signal using compressed air. The pressure-resistant explosion-proof control device of Patent Document 1 controls a fluid-operated device by the compressed air signal converted by the electric-fluid converter. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 9-61229 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the pressure-resistant explosion-proof control device of Patent Document 1, the electro-fluid conversion unit converts the linear motion of a solenoid (electromagnet) into rotational motion, thereby converting the electrical signal inside the pressure-resistant vessel into a compressed air signal, which causes a problem that the configuration of the electro-fluid conversion unit is complex (the number of parts in the electro-fluid conversion unit is large).

[0006] Furthermore, as the configuration of the electro-fluid converter becomes complex, adjustment work for operating the electro-fluid converter (for example, adjusting the angle between the crank and striker to convert linear motion into rotational motion) becomes precise and complicated, and there is a further problem that malfunctions occur due to the complex configuration.

[0007] Furthermore, because the linear motion of a solenoid (electromagnet) is converted into rotational motion, the volume of the electro-fluid converter itself becomes large, making it difficult to achieve high-precision control in a small space.

[0008] The present invention has been made to solve the above-mentioned problems, and has an object to provide a pressure-resistant, explosion-proof control device that can simplify the configuration and adjustment work of the electro-fluid conversion section. [Means for solving the problem]

[0009] In order to solve the above problems, the pressure-resistant explosion-proof control device of the present invention is a pressure-resistant explosion-proof control device that is installed in an explosion-proof pressure container installed in an explosion-hazardous atmosphere and controls a device that operates in the explosion-hazardous atmosphere, and includes a solenoid having a plunger, a rod formed on the plunger, a plunger holding member that holds the plunger, a body holding member that holds a body of the solenoid, and an adjustment mechanism that adjusts a gap between the plunger and the body of the solenoid by adjusting a distance between the plunger holding member and the body holding member; The rod is provided to penetrate the pressure vessel and moves linearly when driven by the plunger, thereby operating the device.

[0010] In the above-described configuration, the driving force of the plunger, which moves linearly, can be transmitted to the rod by the linear motion.

[0011] The pressure-resistant and explosion-proof control device of the present invention is A support member is provided to movably support the plunger holding member, and the plunger holding member is configured to be able to adjust the distance between the plunger holding member and the main body holding member by moving relative to the support member. It is something.

[0012] In the above configuration, the gap between the plunger and the body of the solenoid can be adjusted by the plunger holding member.

[0015] The pressure-resistant and explosion-proof control device of the present invention has a shim disposed between the plunger holding member and the plunger moving toward the plunger holding member.

[0016] In the above configuration, the shim is disposed between the plunger and the plunger holding member, so that the gap between the plunger and the body of the solenoid can be appropriately adjusted.

[0017] In the pressure-resistant explosion-proof control device of the present invention, the rod is configured so that the side that penetrates the pressure-resistant vessel is separable.

[0018] In the above configuration, the rod can be inserted into the pressure vessel without forming an angle therebetween.

[0019] The pressure-resistant and explosion-proof control device of the present invention is A rod holding member for holding the rod is provided. It is something.

[0020] In the above configuration, the plunger, the body of the solenoid, and the rod can be positioned in appropriate positions. Effect of the Invention

[0021] According to the pressure-resistant explosion-proof control device of the present invention, the driving force of the plunger moving linearly can be transmitted to the rod by linear motion, so there is no need to provide a mechanism for converting the driving force of the plunger into rotational motion. Therefore, the configuration of the electro-hydraulic conversion unit itself can be simplified.

[0022] In addition, because the driving force of the plunger, which moves linearly, can be transmitted to the rod through linear motion, there is no need to adjust the angle between the crank and the striker to convert linear motion into rotational motion, which simplifies the adjustment work for the electro-hydraulic converter.

[0023] Furthermore, since there is no need to provide a mechanism for converting the driving force of the plunger into rotational motion, the volume of the electro-fluid converting section itself is small, making it possible to perform highly accurate control in a small space. [Brief description of the drawings]

[0024] [Figure 1]1 is a schematic diagram showing a scale having a pressure-resistant, explosion-proof control device according to an embodiment of the present invention. [Diagram 2] 13 is a front view of the electric-fluid converter when a side wall is removed from the pressure-resistant container in the pressure-resistant explosion-proof control device. FIG. [Diagram 3] FIG. 3 is a partially enlarged view of FIG. [Figure 4] 1A is a front cross-sectional view of the electro-fluid conversion unit in the same pressure-resistant explosion-proof control device before current is applied to the electromagnet, and FIG. 1B is a front cross-sectional view of the electro-fluid conversion unit in the same pressure-resistant explosion-proof control device after current is applied to the electromagnet. [Diagram 5] FIG. 2 is a perspective view of a shim in the pressure-resistant explosion-proof control device. [Figure 6] 13 is a partially enlarged front view of an electro-fluid converter in a pressure-resistant explosion-proof control device according to another embodiment of the present invention when a side wall is removed from a pressure-resistant container. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] The present invention relates to a pressure-resistant, explosion-proof control device 10. As shown in Fig. 1, the control device 10 is an indication control device for a liquid filling scale 80 (an example of an "apparatus") used in explosive atmospheres such as paint factories and chemical factories.

[0026] Scale 80 controlled by control device 10 includes a weighing table 83 with a platform 82 supported by a load cell 81. A filling machine (filling nozzle 90) is provided above platform 82 of weighing table 83, and supplies a filling material to a filling container 91 placed on platform 82. The filling material is supplied to filling container 91 by controlling an opening / closing valve 92 provided on filling nozzle 90.

[0027] The housing of the control device 10 is composed of an explosion-proof pressure-resistant container 11. The pressure-resistant container 11 contains an electrical control unit that digitally converts the output voltage of the load cell 81 to eliminate the tare weight, or compares it with a set value from the numeric keypad 12 to perform fixed-volume and pre-fixed-volume detection. The pressure-resistant container 11 contains electrical components and the like for controlling an opening / closing valve 92 of a filling machine that operates in an explosive atmosphere using compressed air as a working fluid. The opening / closing valve 92 is operated by opening and closing an external switch 50 provided on the outside of a side wall 11a of the pressure-resistant container 11.

[0028] The control device 10 includes an electro-fluid converter 20 for outputting an electric signal inside the pressure vessel 11 to the outside of the pressure vessel 11 as a signal using compressed air. As shown in FIG. 2, a plurality of electro-fluid converters 20 are attached to predetermined positions of the pressure vessel 11. More specifically, a plurality of electro-fluid converters 20 are attached in parallel at predetermined intervals in the vertical direction along one side wall 11a of the pressure vessel 11. As shown in FIGS. 3 and 4, the electro-fluid converter 20 mainly includes a solenoid 21, a rod 30, and an external switch 50.

[0029] In the electric fluid converting unit 20, the solenoid 21 is driven by an electric signal inside the pressure-resistant container 11. Furthermore, the rod 30 is driven by the driving force of the solenoid 21. Then, the external switch 50 is actuated by the driving force of the rod 30, and the electric signal inside the pressure-resistant container 11 is output to the outside of the pressure-resistant container 11 as a signal using compressed air.

[0030] The solenoid 21 mainly comprises a main body 22, an electromagnet 23 fixed to the main body 22, and a plunger 24 that is attracted to the electromagnet 23 by a magnetic field generated by energizing the electromagnet 23. The plunger 24 is inserted into the electromagnet 23 so as to be able to move forward and backward. The plunger 24 moves linearly due to an attractive force acting on the electromagnet 23 in response to an electric signal output from a circuit board (not shown) inside the pressure-resistant vessel 11.

[0031] As shown in FIGS. 2 to 4, the solenoid 21 is held by a plunger holding member 40 and a main body holding member 41.

[0032] More specifically, the end 24a of the plunger 24 opposite to the side inserted into the electromagnet 23 is held by the plunger holding member 40. By holding the plunger 24 by the plunger holding member 40, it is possible to prevent the plunger 24 from falling off the electromagnet 23.

[0033] The main body 22 (electromagnet 23 ) is fixed to a main body holding member 41 .

[0034] The plunger holding member 40 and the main body holding member 41 are made of plate-like members and are arranged opposite to each other. The plunger holding member 40 and the main body holding member 41 are supported by a plurality of rod-like spacers 43 protruding from the side wall 11a of the pressure-resistant container 11 toward the inside of the pressure-resistant container 11, and are arranged parallel to the side wall 11a of the pressure-resistant container 11. The rod-like spacer 43 is formed by connecting a plurality of long spacers 43a having male and female threads.

[0035] The main body holding member 41 has a hole 41a through which the rod 30 (proximal end rod 30A) can be inserted. The diameter of the hole 41a is set to be larger than the outer diameter of the rod 30 (proximal end rod 30A).

[0036] The plunger holding member 40 and the body holding member 41 fix the plunger 24 and the electromagnet 23 (body 22) at an optimal gap S (see FIG. 4(a)) by disposing a spacer 43a of a predetermined length between the plunger holding member 40 and the body holding member 41. Here, the size of the gap S has a large effect on the output of the electromagnet 23. Specifically, when the gap S is longer than a predetermined distance, the output of the electromagnet 23 is reduced. When the output of the electromagnet 23 is reduced, the driving force of the plunger 24 is reduced and the rod 30 cannot be moved sufficiently. As a result, the external switch 50 operated by the rod 30 malfunctions. Therefore, by fixing the plunger 24 and the electromagnet 23 (body 22) at the optimal gap S, the output of the electromagnet 23 is adjusted to be optimal.

[0037] The gap S between the plunger 24 and the electromagnet 23 (main body 22) is determined by the interval K (see FIG. 4(a)) between the plunger holding member 40 and the main body holding member 41. Here, the plunger 24 is biased by an elastic member (not shown) provided inside the external switch 50, and when the electromagnet 23 is OFF, the plunger 24 moves toward the plunger holding member 40 (in the direction away from the electromagnet 23) by the biasing force of the elastic member. Therefore, by arranging a spacer 43a of a predetermined length between the plunger holding member 40 and the main body holding member 41 to adjust the interval K between the plunger holding member 40 and the main body holding member 41, the gap S is adjusted to optimize the output of the electromagnet 23. In this way, the plunger holding member 40 is configured to be able to adjust the gap S between the plunger 24 and the electromagnet 23 (main body 22) by arranging a spacer 43a of a predetermined length between the plunger holding member 40 and the main body holding member 41.

[0038] Furthermore, the gap S between the plunger 24 and the electromagnet 23 (main body 22) is adjusted by a shim 25 (one example of a "gap adjustment mechanism"). As shown in FIG. 5, the shim 25 is made of a plate material of a predetermined thickness. The shim 25 is made of a shim body 25a arranged in the gap S, and a fitting portion 25b formed in the vertical direction from the central lower portion of the shim body 25a and fitted to the plunger 24. The shim 25 adjusts the gap S between the plunger 24 and the electromagnet 23 (main body 22) by being arranged between the plunger 24 and the plunger holding member 40. That is, the shim 25 functions as a gap adjustment mechanism that adjusts the gap S between the plunger 24 and the electromagnet 23 (main body 22). The gap S between the plunger 24 and the electromagnet 23 (main body 22) is adjusted by the distance K between the plunger holding member 40 and the main body holding member 41, but this adjustment cannot adjust the gap S to a fine distance. Therefore, by disposing a shim 25 between the plunger 24 and the plunger holding member 40, the gap S between the plunger 24 and the electromagnet 23 (main body 22) can be finely adjusted. Therefore, the gap S can be precisely adjusted to optimize the output of the electromagnet 23.

[0039] 2 to 4, the rod 30 is a member for operating the external switch 50. The rod 30 moves linearly as a result of the plunger 24 moving linearly. As the rod 30 moves linearly, the tip of the rod 30 comes into contact with the external switch 50, opening and closing the external switch 50.

[0040] The rod 30 is configured so that the side penetrating the side wall 11a of the pressure-resistant container 11 can be separated. Specifically, the rod 30 is configured by a base end side rod 30A formed on the plunger 24 and a tip end side rod 30B connected to the base end side rod 30A and penetrating the side wall 11a of the pressure-resistant container 11.

[0041] The base end rod 30A is a member integrally formed with the plunger 24, and is formed along the axis of the plunger 24. The base end rod 30A moves linearly in the horizontal direction as the plunger 24 moves linearly. One end 31 (the end opposite to the side where the plunger 24 is provided) of the base end rod 30A abuts against one end 32 of the tip end rod 30B. The base end rod 30A transmits the driving force due to the linear motion of the plunger 24 to the tip end rod 30B as the one end 31 abuts against the one end 32 of the tip end rod 30B. The base end rod 30A is configured such that the one end 31 can be inserted into the main body holding member 41. The base end rod 30A moves linearly in the horizontal direction, so that the one end 31 is inserted into the main body holding member 41 and is held by the main body holding member 41.

[0042] The tip rod 30B is a member that is inserted into the side wall 11a of the pressure-resistant vessel 11 to open and close the external switch 50. The tip rod 30B moves linearly in the horizontal direction as the base rod 30A moves linearly. The tip rod 30B has one end 32 (the end on the inside of the pressure-resistant vessel 11) held by the rod holding member 42 so as to be insertable, and the other end 33 (the end on the outside of the pressure-resistant vessel 11) is supported by the pressure-resistant vessel 11 so as to be insertable. The side wall 11a of the pressure-resistant vessel 11 that supports the other end 33 of the tip rod 30B has a hole 11b through which the tip rod 30B can be inserted. The hole diameter of the hole 11b is set to a diameter that is approximately the same as the outer diameter of the other end 33 of the tip rod 30B (a diameter that is approximately the same as the outer diameter of the other end 33 of the tip rod 30B so that the other end 33 of the tip rod 30B can be inserted). The tip side rod 30B is composed of a rod main body 34 and an annular protrusion portion 35.

[0043] The rod body 34 has one end 32 that abuts against the one end 31 of the base end rod 30A. The end face of the one end 32 of the rod body 34 (the face that abuts against the one end 31 of the base end rod 30A) is formed in a flat shape. The other end 33 of the rod body 34 abuts against the external switch 50. The end face of the other end 33 of the rod body 34 (the face that abuts against the external switch 50) is formed in a flat shape. The tip end rod 30B transmits the driving force due to the linear movement of the plunger 24 to the external switch 50 by the one end 32 of the rod body 34 abutting against the one end 31 of the base end rod 30A. In addition, by forming both end faces (the end face of the one end 32 and the end face of the other end 33) of the rod body 34 that are formed in a flat shape into spherical surfaces, the driving force due to the linear movement of the plunger 24 can be efficiently transmitted when the rod body 34 abuts against the one end 31 of the base end rod 30A or the external switch 50.

[0044] The annular protrusion 35 is a portion that protrudes in an annular shape from the outer circumferential wall of the rod main body 34. The annular protrusion 35 restricts the movement of the rod main body 34 by abutting against the side wall 11a of the pressure-resistant vessel 11 when the tip-side rod 30B moves linearly.

[0045] The rod holding member 42 is made of a plate-like member and is disposed opposite the main body holding member 41 and the side wall 11a of the pressure-resistant container 11. The rod holding member 42 is supported by a plurality of rod-like spacers 43. The rod holding member 42 has a hole 42a through which the one end 32 of the tip side rod 30B can be inserted. The hole diameter of the hole 42a is set to be larger than the outer diameter of the one end 32 of the tip side rod 30B and smaller than the outer diameter of the one end 31 of the base end rod 30A. The rod holding member 42 holds the one end 32 of the tip side rod 30B, thereby preventing the tip side rod 30B from falling off.

[0046] The external switch 50 is actuated by the driving of the rod 30 to output compressed air and open / close the opening / closing valve 92 of the filling machine. The external switch 50 is mainly composed of a main body portion 51 and an operation portion 52.

[0047] An air flow path 53 through which compressed air is output is provided in the main body 51. The main body 51 is connected via the air flow path 53 to an opening and closing valve 92 of the filling machine.

[0048] The operating unit 52 is provided on a side surface of the main body 51. The operating unit 52 outputs compressed air from the air flow path 53 when the other end 33 of the tip side rod 30B comes into contact with the operating unit 52.

[0049] Next, the operation of the electro-fluid converter 20 will be described. As shown in Fig. 4, in the electro-fluid converter 20, a magnetic field is generated by energizing the electromagnet 23, and the plunger 24 is attracted to the electromagnet 23 by the generated magnetic field. As a result, the base end rod 30A provided on the plunger 24 performs a rectilinear motion in the horizontal direction and moves toward the side wall 11a of the pressure-resistant container 11, as shown in Fig. 4(b).

[0050] As the base-side rod 30A moves toward the side wall 11a of the pressure-resistant vessel 11, one end 31 of the base-side rod 30A presses one end 32 of the tip-side rod 30B. This causes the tip-side rod 30B to move rectilinearly in the horizontal direction and move toward the external switch 50. Here, the tip-side rod 30B has one end 32 held by the rod holding member 42 and the other end 33 supported by the side wall 11a of the pressure-resistant vessel 11, so that the tip-side rod 30B penetrates the side wall 11a of the pressure-resistant vessel 11 approximately horizontally and does not pry the side wall 11a of the pressure-resistant vessel 11, etc., during the horizontal rectilinear movement.

[0051] As the tip-side rod 30B moves towards the external switch 50, the other end 33 of the tip-side rod 30B presses the operation part 52 of the external switch 50. This opens the external switch 50 and activates the opening and closing valve 92 of the filling machine. Note that as the tip-side rod 30B moves towards the external switch 50, the annular protrusion 35 of the tip-side rod 30B abuts against the side wall 11a of the pressure-resistant container 11, so that the other end 33 of the tip-side rod 30B does not press the operation part 52 of the external switch 50 more than necessary.

[0052] On the other hand, when the power supply to the electromagnet 23 is stopped and the attraction of the electromagnet 23 to the plunger 24 is released, the plunger 24 moves away from the electromagnet 23, as shown in Fig. 4(a). This causes the base-end rod 30A to release the pressure on the tip-end rod 30B.

[0053] Here, the base end rod 30A and the tip end rod 30B are simply arranged in contact with each other. Therefore, when the pressure applied by the base end rod 30A to the tip end rod 30B is released, the one end 31 of the base end rod 30A tries to move away from the one end 32 of the tip end rod 30B. However, the tip end rod 30B is biased toward the inside of the pressure-resistant container 11 (the opposite side to the side wall 11a) by an elastic member (not shown) provided inside the external switch 50. Therefore, when the pressure applied by the base end rod 30A is released, the tip end rod 30B moves linearly toward the inside of the pressure-resistant container 11 while pressing the base end rod 30A. As a result, the base end rod 30A moves linearly toward the inside of the pressure-resistant container 11, and the plunger 24 moves linearly in a direction away from the electromagnet 23. At the same time, the pressure applied to the operating portion 52 of the external switch 50 by the tip end rod 30B is released, so that the external switch 50 is closed and the operation of the opening and closing valve 92 of the filling machine is stopped.

[0054] As described above, with the pressure-resistant explosion-proof control device 10, the driving force of the rectilinearly moving plunger 24 can be transmitted to the rod 30 by the rectilinear motion, so there is no need to provide a mechanism for converting the driving force of the plunger 24 into rotational motion. Therefore, the configuration of the electric fluid converting unit 20 itself can be simplified.

[0055] In addition, in the pressure-resistant explosion-proof control device 10, the driving force of the plunger 24, which moves linearly, can be transmitted to the rod 30 by linear motion, eliminating the need to adjust the angle between the crank and the striker to convert linear motion into rotational motion. This simplifies the adjustment work for the electro-hydraulic conversion unit 20.

[0056] Furthermore, in the pressure-resistant explosion-proof control device 10, the electro-fluid conversion unit 20 is composed of the solenoid 21, the rod 30, and the external switch 50, which makes it possible to achieve a mechanism that does not convert the driving force of the plunger 24 into rotational motion. As a result, the volume of the electro-fluid conversion unit 20 itself is small, making it possible to perform high-precision control in a small space.

[0057] Furthermore, in the pressure-resistant explosion-proof control device 10, the plunger 24, electromagnet 23 (main body 22), and rod 30 are held by combining three holding members, namely, the plunger holding member 40, the main body holding member 41, and the rod holding member 42. Therefore, the rod 30 penetrates the side wall 11a of the pressure-resistant container 11 approximately horizontally and does not pry into the side wall 11a of the pressure-resistant container 11 etc. when moving straight ahead horizontally. This allows the force of the solenoid 21 to be transmitted without attenuation, and the explosion-proof gap required for explosion-proofing can be stably secured.

[0058] In this embodiment, the pressure-resistant explosion-proof control device 10 is used as an indication control device for the liquid filling scale 80, but this is not limited to this and it is sufficient that it controls a device that operates in an explosive atmosphere.

[0059] In this embodiment, a spacer 43a of a predetermined length is placed between the plunger holding member 40 and the main body holding member 41 to adjust the gap K between the plunger holding member 40 and the main body holding member 41, and further, a shim 25 is placed between the plunger 24 and the plunger holding member 40 to adjust the gap S between the plunger 24 and the electromagnet 23 (main body 22). However, this is not limited to this, and the gap S may be adjusted by moving the plunger holding member 40 relative to the main body holding member 41 as shown in Figure 6 to adjust the gap K between the plunger holding member 40 and the main body holding member 41.

[0060] In this case, a support member 15 for supporting the plunger holding member 40 is provided below the plunger holding member 40. The support member 15 is formed to protrude from the side wall 11a of the pressure vessel 11 toward the inside of the pressure vessel 11, and is fixed to the side wall 11a of the pressure vessel 11. The support member 15 has a long hole 15a extending in the longitudinal direction of the support member 15.

[0061] When adjusting the distance K between the plunger holding member 40 and the main body holding member 41, the fastening member 40a that fastens the plunger holding member 40 to the support member 15 is inserted through the plunger holding member 40 and the long hole 15a, and the plunger holding member 40 is slid relative to the support member 15.

[0062] In this embodiment, the rod 30 is divided into a base end rod 30A and a tip end rod 30B, but the present invention is not limited to this, and the rod 30 may be formed from a single rod.

[0063] In this embodiment, the gap S between the plunger 24 and the electromagnet 23 (main body 22) is adjusted by a shim 25, but this is not limited to this, and if the gap S can be adjusted by adjusting the distance K between the plunger holding member 40 and the main body holding member 41, it is not necessary to provide the shim 25.

[0064] In this embodiment, the tip rod 30B is biased toward the inside of the pressure-resistant container 11 by an elastic member (not shown) provided inside the external switch 50, but this is not limited to this. For example, an elastic member such as a coil spring may be incorporated inside the pressure-resistant container 11 so that the tip rod 30B is biased toward the inside of the pressure-resistant container 11.

[0065] In this embodiment, the shim 25 is used as a gap adjustment mechanism for adjusting the gap S between the plunger 24 and the electromagnet 23 (main body 22), but the present invention is not limited to this, and the plunger 24 itself may function as the gap adjustment mechanism. Specifically, a plurality of plungers 24 having different thicknesses of the flange portion 24b (see FIG. 4) are prepared, and the plunger 24 is replaced according to the desired gap S, thereby adjusting the gap S between the plunger 24 and the electromagnet 23 (main body 22). The flange portion 24b is a protruding portion formed on the outer periphery of the plunger 24 on the plunger holding member 40 side (in the direction away from the electromagnet 23).

[0066] Also, a mechanism may be provided that adjusts the gap S between the plunger 24 and the electromagnet 23 (main body 22) by pressing the plunger 24 moving toward the plunger holding member 40 (in the direction away from the electromagnet 23) from the plunger holding member 40 side (restricting the movement of the plunger 24 from the plunger holding member 40 side). Specifically, the gap S between the plunger 24 and the electromagnet 23 (main body 22) is adjusted by providing the plunger holding member 40 with a restricting member that restricts the movement of the plunger 24 by abutting against the end 24a of the plunger 24. [Explanation of symbols]

[0067] 10 Explosion-proof control device 11 Heat-resistant container 21 Solenoid 24 Plunger 30 Rod 80 Scales (equipment)

Claims

1. A pressure-resistant explosion-proof control device that is installed in an explosion-proof pressure container installed in an explosion-hazardous atmosphere and controls a device that operates in the explosion-hazardous atmosphere, a solenoid having a plunger; A rod formed on the plunger; A plunger holding member for holding the plunger; A body holding member for holding the body of the solenoid; an adjustment mechanism that adjusts a gap between the plunger and the body of the solenoid by adjusting a distance between the plunger holding member and the body holding member; Equipped with The rod is A pressure vessel is provided through the pressure vessel. The plunger is driven to move linearly to operate the device. This is an explosion-proof pressure-resistant control device.

2. A support member that movably supports the plunger holding member, The plunger holding member is configured to be movable relative to the support member so as to adjust the distance between the plunger holding member and the main body holding member.

2. The pressure-resistant and explosion-proof control device according to claim 1 .

3. A shim is disposed between the plunger moving toward the plunger holding member and the plunger holding member.

3. The pressure-resistant and explosion-proof control device according to claim 1 or 2.

4. The rod is configured so that the side penetrating the pressure-resistant vessel can be separated. The pressure-resistant and explosion-proof control device according to any one of claims 1 to 3,

5. A rod holding member for holding the rod is provided. The pressure-resistant and explosion-proof control device according to any one of claims 1 to 4,

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