Chassis

Abstract

A housing is provided that is equipped with a means for adjusting, from outside the housing, the relative relationship between a sensor installed inside the housing and a detection object that is the detection target of the sensor. [Solution] The housing 1 includes a sensor 30 installed inside the housing 1, a detection object 12 that is the detection target of the sensor, and an adjustment unit 20 that adjusts the relative relationship between the sensor 30 and the detection object 12 from outside the housing. As a result, the relative relationship between the sensor 30 and the detection object 12 can be adjusted from outside the housing 1, so that the relative relationship between the sensor 30 and the detection object 12 inside the housing 1 can be safely adjusted even in an explosive atmosphere.

Description

[Technical field]

[0001] The present invention relates to a housing. [Background technology]

[0002] Conventionally, in an apparatus equipped with a main valve, a mechanism for adjusting the position of a sensor that detects the opening and closing of the main valve is known. For example, Patent Document 1 discloses an exhaust device for a draft chamber that has a means for adjusting the position of a limit switch that detects the opening and closing of a flow rate control valve in a draft chamber equipped with a flow rate control valve. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2003-106590 A Summary of the Invention [Problem to be solved by the invention]

[0004] The exhaust device of the draft chamber disclosed in Patent Document 1 is provided with a mounting plate to which the limit switch is fixed so that it can be adjusted to rotate steplessly around the axis of the rotating shaft of the flow control valve in order to adjust the mounting position of the limit switch.

[0005] However, in Patent Document 1, when adjusting the position of the limit switch, it was necessary to remove the cover of the motor that moves the flow rate adjustment valve. Therefore, when a conventional exhaust device is installed in an explosive gas vapor atmosphere generated by a combustible substance and a combustion supporting substance, removing the cover exposes a part (ignition source) that becomes hot due to overheating caused by electric sparks that cause ignition or failure of electrical equipment to the explosive gas vapor atmosphere, so there was a problem that it was not possible to remove the cover of the housing to adjust the installation position of a sensor such as a limit switch in the housing in order to prevent the occurrence of a fire or explosion.

[0006] Furthermore, not only in exhaust devices equipped with limit switches as described above, but also in housings equipped with sensors, the cover needs to be removed even when the housing is not exposed to explosive gas, and in some cases, other parts need to be removed in order to remove the cover, which makes maintenance difficult and makes it difficult to easily adjust the relative relationship between the sensor and the detection object that the sensor is trying to detect.

[0007] The present invention has been made in consideration of the above circumstances, and aims to provide a housing equipped with a means for adjusting the relative relationship between a sensor and a detection object from outside the housing without removing the cover of the housing in which a sensor such as a limit switch is installed. [Means for solving the problem]

[0008] The present invention is intended to solve the above-mentioned problems, and a housing according to one embodiment of the present invention comprises: A sensor installed inside the housing; A detection object that is a detection target of the sensor; an adjustment unit that adjusts the relative relationship between the sensor and the detection object from outside the housing; Equipped with. Effect of the Invention

[0009] The housing according to one embodiment of the present invention includes an adjustment unit that adjusts the relative relationship between the sensor and the detection object installed inside the housing from outside the housing.

[0010] Therefore, the relative relationship between the sensor and the detection object installed inside the housing can be adjusted without removing the cover of the housing. [Brief description of the drawings]

[0011] [Figure 1] 1 is a front cross-sectional view showing an example of a housing 1 according to an embodiment of the present invention. [Diagram 2] 1 is a top cross-sectional view showing an example of a housing 1 according to an embodiment of the present invention. [Diagram 3] FIG. 4 is a schematic diagram showing an adjustment means according to an embodiment of the present invention. [Figure 4] FIG. 2 is an enlarged view of a cap 50 according to an embodiment of the present invention. [Diagram 5] 1 is a front view showing an example of a fluid pressure driven valve 4 including a housing 1 according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0013] (Embodiment) Fig. 1 is a front cross-sectional view showing an example of a housing 1 according to an embodiment of the present invention. Fig. 2 is a top cross-sectional view showing an example of a housing 1 according to an embodiment of the present invention. Fig. 1 is a cross-sectional view taken along line ii in Fig. 2.

[0014] The housing 1 is a box that forms the appearance and outer shape of the device, and usually houses electrical equipment and machinery. The housing 1 has a generally rectangular parallelepiped shape. The housing 1 is composed of an upper housing part 2 and a lower housing part 3. That is, the housing 1 can be separated into the upper housing part 2 and the lower housing part 3, and when the upper housing part 2 is placed on the lower housing part 3, the inside of the housing 1 is sealed. The housing 1 is made of a metal material such as aluminum.

[0015] In this embodiment, a case will be described in which the housing 1 functions as a housing for the solenoid valve 100. That is, the solenoid valve 100 includes the housing 1 and a spool valve 101 (described later).

[0016] The housing 1 includes a rotating shaft 10 connecting the inside and outside of the housing 1, a detection body 12, a crank 11 having a crank groove 11a, a guide plate 13 having a cam groove 13a, a first sensor 30, a second sensor 31, a first adjustment unit 20, and a second adjustment unit 21.

[0017] The rotating shaft 10 is formed in a shaft shape and is disposed so as to communicate between the inside and outside of the housing 1. The rotating shaft 10 is connected to, for example, a main valve (described later), and the rotating shaft 10 rotates in association with the opening and closing of the main valve.

[0018] The detection body 12 is a movable body that moves inside the housing 1, and is a detection target of the first sensor 30 and the second sensor 31. The detection body 12 moves in response to the rotation of the rotating shaft 10. The detection body 12 is a rod-shaped member.

[0019] The housing 1 includes a cam mechanism for moving the detection body 12 linearly in response to the rotational motion of the rotating shaft 10. The cam mechanism includes a crank 11, a crank groove 11a, a guide plate 13, and a cam groove 13a.

[0020] The crank 11 is composed of a long plate-like member. The rotating shaft 10 passes through one end of the crank 11 in the longitudinal direction. The crank 11 and the rotating shaft 10 are fixed to each other. The crank 11 rotates about the axis of the rotating shaft 10 in accordance with the rotational motion of the rotating shaft 10. The crank 11 is formed with a crank groove 11a which is a linear elongated hole extending in a direction away from the rotating shaft 10. The detection body 12 is supported in the crank groove 11a so as to be movable along the longitudinal direction of the crank groove 11a.

[0021] The guide plate 13 is made of a flat plate material. The guide plate 13 is installed below the crank 11. The guide plate 13 is supported by the housing lower part 3 so that the surface of the guide plate 13 is perpendicular to the axial direction of the rotating shaft 10. The cam groove 13a has a shape in which a straight long hole and a semi-arc long hole are connected to the upper and lower ends of the straight long hole. The detection body 12 is movable along the cam groove 13a in response to the rotational motion of the rotating shaft 10.

[0022] That is, when the rotating shaft 10 rotates counterclockwise, the detection element 12 moves linearly upward in the plane of the paper in Fig. 2. When the rotating shaft 10 rotates clockwise, the detection element 12 moves linearly downward in the plane of the paper in Fig. 2.

[0023] The first sensor 30 and the second sensor 31 are sensors that detect the detection object 12. The first sensor 30 and the second sensor 31 detect a predetermined position of the detection object 12 by contacting the detection object 12. For example, a limit switch is used as the first sensor 30 and the second sensor 31 as a position detection sensor that detects the predetermined position of the detection object 12. The limit switch includes an actuator, a cover, a built-in switch, and a switch case. The actuator transmits the force or movement received from the detection object 12 to the built-in switch via an internal plunger. The built-in switch instantly switches on and off by a snap action mechanism. An external connection cable is wired to the terminal of the built-in switch for power supply and signal transmission. The switch case protects the built-in switch.

[0024] The detection object 12 presses the actuator of the first sensor 30 or the actuator of the second sensor 31. Specifically, when the detection object 12 makes a reciprocating linear motion in response to the rotational motion of the rotating shaft 10, when the detection object 12 presses the actuator of the first sensor 30, the force is transmitted to a built-in switch inside the first sensor 30 via a plunger. When the built-in switch is energized by the pressing operation, the built-in switch transmits a signal indicating that the detection object 12 has been detected to the outside.

[0025] The first adjustment unit 20 includes a first rail 22, a first base 24, a first driving member 26, and a first conversion mechanism 28. Similarly, the second adjustment unit 21 includes a second rail 23, a second base 25, a second driving member 27, and a second conversion mechanism 29. The first adjustment unit 20 and the second adjustment unit 21 adjust the installation positions of the first sensor 30 and the second sensor 31 in the housing 1, respectively, to adjust the predetermined position of the detection object 12.

[0026] First rail 22 and second rail 23 are rails laid in a straight line so as to be parallel to one side of the rectangular bottom surface of housing 1. The longitudinal direction of the straight portion of cam groove 13a, the longitudinal direction of first rail 22, and the longitudinal direction of second rail 23 are all parallel to each other.

[0027] A first pedestal 24 and a second pedestal 25 are supported on the first rail 22 and the second rail 23, respectively. The first pedestal 24 and the second pedestal 25 are movable linearly on the first rail 22 and the second rail 23, respectively, along the longitudinal direction of the linear portion of the corresponding rail and cam groove 13a.

[0028] The first pedestal 24 and the second pedestal 25 support a first sensor 30 and a second sensor 31, respectively. That is, the first sensor 30 and the second sensor 31 are placed on the upper part of the first pedestal 24 and the upper part of the second pedestal 25, respectively. In addition, the first pedestal 24 and the second pedestal 25 each have a hole extending along a straight line. A screw groove is formed on the inner circumference of each hole. The corresponding first driving member 26 and second driving member 27 are screwed into and pass through each hole.

[0029] Each of the first driving member 26 and the second driving member 27 is formed as a rod-shaped member with at least one end exposed to the outside of the housing 1, and is supported by the housing 1 so as to be rotatable around the longitudinal axis. A screw thread is formed on the outer periphery of the rod-shaped member. In addition, a first operating part 26a and a second operating part 27a are formed on one end of the first driving member 26 and one end of the second driving member 27 exposed to the outside of the housing 1, respectively. Specifically, the first operating part 26a and the second operating part 27a are parts formed with a shape that fits a tool such as a screwdriver. Therefore, a tool such as a screwdriver can be connected to the first operating part 26a or the second operating part 27a, and the first driving member 26 or the second driving member 27 can be rotated around the respective axis using the tool. The first driving member 26 or the second driving member 27 rotated in a predetermined direction is screwed into the corresponding first base 24 or second base 25, thereby enabling the corresponding first base 24 or second base 25 to move along the corresponding first rail 22 or second rail 23.

[0030] The first conversion mechanism 28 includes a screw thread on the outer periphery of the first driving member 26 and a screw groove on the inner periphery of the hole of the first base 24. The engagement between the screw groove of the first base 24, which is the first conversion mechanism 28, and the screw thread of the first driving member 26 can convert the rotational motion of the first driving member 26 into the linear motion of the first base 24 along the first rail 22. Similarly, the second conversion mechanism 29 includes a screw thread on the outer periphery of the second driving member 27 and a screw groove on the inner periphery of the hole of the second base 25. The engagement between the screw groove of the second base 25, which is the second conversion mechanism 29, and the screw thread of the second driving member 27 can convert the rotational motion of the second driving member 27 into the linear motion of the second base 25 along the second rail 23.

[0031] The solenoid unit 40 includes a solenoid case, a solenoid coil (not shown) housed in the solenoid case, and a movable iron core (not shown) movably arranged within the solenoid coil. When the housing 1 functions as a housing for the solenoid valve 100, a drive device 200 (described later) connected to the solenoid valve 100 is operated by switching the energized state of the solenoid unit 40. The detailed operation of the solenoid valve 100 will be described later.

[0032] FIG. 3 is a schematic diagram showing an example of an adjustment means according to an embodiment of the present invention.

[0033] The first adjustment unit 20 and the second adjustment unit 21 adjust the installation positions of the first sensor 30 and the second sensor 31 inside the housing 1 via the first conversion mechanism 28 and the second conversion mechanism 29, respectively, to adjust the predetermined position of the detection object 12. The predetermined position of the detection object 12 is a position that indicates that the rotating shaft 10, which performs a rotational motion according to the reciprocating linear motion of the detection object 12, is in a specific state. The specific state of the rotating shaft 10 is, for example, the state of the rotating shaft 10 when the main valve connected to the rotating shaft 10 is fully open, or the state of the rotating shaft 10 when the main valve is fully closed. That is, each of the first adjustment unit 20 and the second adjustment unit 21 can adjust the relative relationship between the first sensor 30 and the detection object 12 or the second sensor 31 and the detection object 12 from outside the housing 1.

[0034] FIG. 3 shows the positional relationship of the cam groove 13a, the detection body 12 fitted in the cam groove 13a, the first sensor 30, and the second sensor 31 when the inside of the housing 1 is viewed from above. Three positional relationships are shown in FIG. 3. In each of the views of FIG. 3, two detection bodies 12 are shown spaced apart in the vertical direction of the paper for one cam groove 13a. In this figure, the detection body 12 is shown when the detection body 12 reaches two predetermined positions due to the rotational movement of the rotating shaft 10. In reality, as shown in FIG. 1 and FIG. 2, there is only one detection body 12. In FIG. 3, for example, the detection body 12 located below the cam groove 13a on the paper surface shows the detection body 12 that has reached a predetermined position representing the time when the main valve is in a fully open state, while the detection body 12 located above the paper surface shows the detection body 12 that has reached a predetermined position representing the time when the main valve is in a fully closed state. The first sensor 30 and the second sensor 31 are installed at positions corresponding to the respective predetermined positions reached by the detection body 12.

[0035] In the diagram shown in the center of Fig. 3, two detection bodies 12 are shown near the center of the cam groove 13a, and a first sensor 30 and a second sensor 31 are installed at positions corresponding to the respective detection bodies 12. Here, in the diagram shown on the left side of Fig. 3, the positions of the two detection bodies 12 are shifted toward the upper part of the paper compared to the diagram shown in the center of Fig. 3. This can occur, for example, when the rotating shaft 10 is removed and reinstalled during maintenance, or when the fully open / fully closed positions of the main valve and the position of the rotating shaft 10 are misaligned due to deterioration over time.

[0036] That is, the left side of FIG. 3 shows, for example, a main valve with the rotating shaft 10 displaced counterclockwise. In this case, it is necessary to adjust the positions of the first sensor 30 and the second sensor 31 to make the detection body 12 correspond to a predetermined position. The method of adjusting the position of the first sensor 30 is to couple a tool such as a screwdriver to the first operating part 26a and rotate the first driving member 26, for example, counterclockwise, to move the first sensor 30 in a direction away from the first operating part 26a, that is, in a direction toward the top of the paper surface of FIG. 3. The second sensor 31 is also moved by a similar position adjustment method. This allows the positions of the first sensor 30 and the second sensor 31 to be adjusted.

[0037] In the diagram shown on the right side of FIG. 3, the positions of the two detection bodies 12 are shifted downward on the paper compared to the diagram shown in the center of FIG. 3. In the diagram on the right side of FIG. 3, for example, the rotation shaft 10 is shown attached to the main valve with a clockwise shift. In this case, it is also necessary to adjust the positions of the first sensor 30 and the second sensor 31 to correspond to the predetermined position. A tool such as a screwdriver is connected to the first operating part 26a, and the first driving member 26 is rotated, for example, clockwise, to move the first sensor 30 in a direction approaching the first operating part 26a, that is, in a direction toward the bottom of the paper in FIG. 3. The second sensor 31 is also moved by a similar position adjustment method. This allows the positions of the first sensor 30 and the second sensor 31 to be adjusted.

[0038] In the above, the case where the installation positions of the two sensors, the first sensor 30 and the second sensor 31, are adjusted upward or downward on the paper surface has been described, but the installation position of only one of the first sensor 30 or the second sensor 31 may be adjusted. Also, the adjustment directions of the installation positions of the two sensors may be different, such as adjusting the installation position of the first sensor 30 upward on the paper surface and the installation position of the second sensor 31 downward on the paper surface.

[0039] 4 is an enlarged view showing an example of the cap 50 according to the embodiment of the present invention. As a special feature of the case 1 according to this embodiment, the cap 50 attached to the side surface of the case 1 will be described.

[0040] The cap 50 has a function of covering the first operation unit 26a and the second operation unit 27a. By attaching the cap 50 to the first operation unit 26a and the second operation unit 27a, the installation positions of the first sensor 30 or the second sensor 31 in the housing 1 are prevented from unintentionally moving when the operator inadvertently touches the first operation unit 26a or the second operation unit 27a. When the operator wants to adjust the installation positions of the first sensor 30 or the second sensor 31, the operator can remove the cap 50 and adjust the respective positions.

[0041] (Configuration and embodiment of fluid pressure driven valve) FIG. 5 is a front view showing an example of a fluid pressure driven valve 4 including a housing 1 according to an embodiment of the present invention.

[0042] The housing 1 is used, for example, as a housing for a solenoid valve 100 constituting a fluid pressure driven valve 4. The fluid pressure driven valve 4 includes a main valve 300 arranged midway through a pipe 310, a drive unit 200 that drives a rotating shaft 10 connected to the main valve 300 in response to the fluid pressure of the driving fluid to open and close the main valve 300, and a solenoid valve 100 that has a function of controlling the supply and discharge of the driving fluid to and from the drive unit 200.

[0043] The fluid pressure driven valve 4 is installed in, for example, a pipe 310 in a plant facility through which various gases, oil, etc. flow, and is used as an emergency shutoff valve for shutting off the flow in the pipe 310 during an emergency shutdown due to an abnormality in the plant facility. The installation location and uses of the fluid pressure driven valve 4 are not limited to the above examples.

[0044] The fluid pressure driven valve 4 is supplied with air from an air supply source (not shown) as an example of a driving fluid, and the air from the air supply source is supplied to the solenoid valve 100 via a first air piping (not shown) and is further supplied to the drive unit 200 via a second air piping 220. A power cable (not shown) for supplying power to the solenoid valve 100 from an external power source (not shown) is connected to the fluid pressure driven valve 4. The driving fluid is not limited to the above air, and may be other gases or liquids (e.g., oil).

[0045] In this embodiment, the fluid pressure driven valve 4 employs an airless close system. Therefore, during normal operation, the main valve 300 is fully opened by supplying air (intake air) from an air supply source (not shown) to the drive unit 200 via the solenoid valve 100, and during emergency stop or test operation, the main valve 300 is fully closed by discharging air (exhaust air) from the drive unit 200 via the solenoid valve 100. Note that the fluid pressure driven valve 4 may employ an airless open system, in which case the main valve 300 may be fully opened by supplying air to the drive unit 200, and fully closed by discharging air from the drive unit 200.

[0046] The main valve 300 is, for example, a valve called a ball valve. As an example of the configuration of the main valve 300, the main valve 300 includes a valve box 320 disposed midway through the piping 310, and a ball-shaped valve element 321 rotatably provided within the valve box 320, and a first end of the rotating shaft 10 is connected to an upper portion of the valve element 321. As the rotating shaft 10 is rotated from 0 degrees to 90 degrees, the valve element 321 rotates within the valve box 320, and the main valve 300 is switched between a fully open state (the state shown in FIG. 5) and a fully closed state. Note that the valve used as the main valve 300 is not limited to a ball valve, and may be another type such as a butterfly valve.

[0047] The driving device 200 is arranged between the main valve 300 and the solenoid valve 100, for example, and is configured as a single-acting air cylinder mechanism. As an example of the configuration, the driving device 300 includes a cylindrical cylinder 210, a pair of pistons 212A and 212B that are arranged in the cylinder so as to be capable of reciprocating linearly and are connected via a piston rod 211, a coil spring 213 provided on the first piston 212A side, an air supply / discharge port 214 formed on the second piston 212B side, and a transmission mechanism 215 provided at a portion where the rotating shaft 10 arranged to penetrate the cylinder 210 in the radial direction and the piston rod 211 intersect at right angles. Note that the driving device 200 is not limited to a single-acting type, and may be configured in another form, such as a double-acting type.

[0048] The first piston 212A is biased by the coil spring 213 in a direction to close the main valve 300. The second piston 212B is pressed in a direction to open the main valve 300 against the biasing force of the coil spring 213 by air (supply air) supplied from the air supply / discharge port 214. The transmission mechanism 215 is composed of, for example, a rack-and-pinion mechanism, a link mechanism, a cam mechanism, or the like, and converts the reciprocating linear motion of the piston rod 211 into rotational motion and transmits it to the rotating shaft 10.

[0049] The rotating shaft 10 is disposed so as to rotatably pass through the driving device 200. A first end of the rotating shaft 10 is connected to the main valve 300, and a second end of the rotating shaft 10 is journalled by the solenoid valve 100. The rotating shaft 10 may be formed by connecting a plurality of shafts together, for example, by a coupling.

[0050] The solenoid valve 100 has a function of controlling the supply and exhaust of air to the drive device 200, and is configured as, for example, a two-position normally closed type three-way solenoid valve ("open" when energized, "closed" when de-energized). The solenoid valve 100 includes a spool valve 101 for switching the flow path through which air flows, outside a case 1 that functions as a housing for the indoor or explosion-proof solenoid valve 100. The solenoid valve 100 also includes a solenoid unit (not shown) for displacing the spool valve 101 according to the energized state (when energized or de-energized) inside the case 1. The solenoid valve 100 is not limited to a two-position normally closed type three-way solenoid valve, but may be a three-position, normally open type, four-way solenoid valve, or the like, and may be configured in various forms based on any combination. In the present embodiment, the solenoid valve 100 is used as a pilot valve in the fluid pressure driven valve 4, but the use of the solenoid valve 100 is not limited to this.

[0051] The spool valve 101 has an input port connected to an air supply source via a first air pipe, an output port connected to the drive unit 200 via a second air pipe 220, and an exhaust port for discharging exhaust air from the drive unit 200.

[0052] When energized, the solenoid portion displaces the spool valve 101 so as to connect the input port and the output port, and when de-energized, displaces the spool valve 101 so as to connect the output port and the exhaust port.

[0053] Therefore, when the solenoid valve 100 is in an energized state, air (supply air) from the air supply source flows through the first air piping, the input port, the output port, and the second air piping 220 in this order, and is supplied to the air supply / discharge port 214, thereby pressing the second piston 212B and compressing the coil spring 213. Then, when the rotating shaft 10 is rotationally driven via the piston rod 211 and the transmission mechanism 215 by an amount corresponding to the movement of the piston rod 211 in response to the compression of the coil spring 213, the valve element 321 rotates within the valve box 320, and the main valve 300 is operated to a fully open state.

[0054] On the other hand, when the solenoid valve 100 is in a non-energized state, the air (exhaust air) in the cylinder 210 flows from the air supply / exhaust port 214 through the second air pipe 220, the output port, and the exhaust port in this order, and is discharged to the outside air, thereby reducing the pressing force of the second piston 212B and causing the coil spring 213 to return to its compressed state. Then, when the rotating shaft 10 is rotationally driven via the transmission mechanism 215 by the amount of movement of the piston rod 211 in response to the return of the coil spring 213, the valve element 321 rotates in the valve box 320, and the main valve 300 is operated to a fully closed state.

[0055] (Other embodiments) Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and can be modified as appropriate without departing from the technical spirit of the present invention. All such modifications are included in the technical spirit of the present invention.

[0056] For example, in the above embodiment, the sensor installed inside the housing 1 is a limit switch that detects a predetermined position indicating that the movable detection object 12 is in a specific state, and two sensors, the first sensor 30 and the second sensor 31, are described as being installed. However, the first sensor 30 and the second sensor 31 may be non-contact position detection sensors, and if the detection object 12 is the detection target, the first sensor 30 and the second sensor 31 are not limited to position detection sensors and may be other types of sensors. Furthermore, the number of sensors may be one or more.

[0057] In the above embodiment, the housing 1 is described as a container with a sealed interior, but it is not necessarily sealed and may have gaps or openings. Furthermore, the housing 1 may not only be sealed but also be an explosion-proof housing. In that case, in order for the housing 1 to be an explosion-proof container, it is necessary to satisfy explosion-proof design requirements, such as the gap between the joint surfaces of the first driving member 26 or the second driving member 27 facing the housing 1 being a predetermined length or less with respect to the thickness of the housing 1. The same applies to the other gaps and openings described above, and they also satisfy the explosion-proof design requirements. And, the explosion-proof type may be pressure-resistant explosion-proof, dust explosion-proof, intrinsically safe explosion-proof, or the like, as long as it satisfies the appropriate explosion-proof design requirements that are appropriate for the purpose of the housing.

[0058] Furthermore, in the above embodiment, the detection body 12 has been described as being movable inside the housing 1, but the detection body 12 may be movable outside the housing 1 as long as it is possible to define a predetermined relative relationship between the detection body 12 and the first sensor 30 or the second sensor 31 installed inside the housing 1.

[0059] In addition, in the above embodiment, the housing 1 is described as having a rotating shaft 10 that connects the inside and outside of the housing 1, but as long as the detection body 12 is movable, the housing 1 does not need to have a rotating shaft 10.

[0060] Furthermore, in the above embodiment, the housing 1 has been described as having the solenoid unit 40 that includes a coil for operating the spool valve 101. However, the housing 1 does not necessarily have to include the solenoid unit 40.

[0061] In addition, in the above embodiment, the first conversion mechanism 28 and the second conversion mechanism 29 have been described as converting the rotational motion of the first driving member 26 and the second driving member 27 into linear motion of the first base 24 and the second base 25 along the first rail 22 and the second rail 23 by the engagement between the threads of the first driving member 26 and the second driving member 27 and the thread grooves of the first base 24 and the second base 25 when a rotational force is applied to one end of the first driving member 26 and one end of the second driving member 27, respectively. However, any conversion mechanism, such as a gear mechanism, may be used as long as it converts the rotational motion of the first driving member 26 and the second driving member 27 into linear motion of the first base 24 and the second base 25 along the first rail 22 and the second rail 23 when a rotational force is applied to one end of the first driving member 26 and one end of the second driving member 27.

[0062] Furthermore, in the above embodiment, two adjustment units, a first adjustment unit 20 and a second adjustment unit 21, are provided to correspond to the number of sensors, but the number of adjustment units does not have to correspond to the number of sensors, and there may be one adjustment unit for multiple sensors, or the number of adjustment units may be greater than the number of sensors.

[0063] As described above, according to the housing 1 according to the embodiment, the housing includes a sensor installed inside the housing, a detection object that is a detection target of the sensor, and an adjustment unit that adjusts the relative relationship between the sensor and the detection object from outside the housing. Therefore, the relative relationship between the sensor installed inside the housing and the detection object can be adjusted from outside the housing without removing the cover of the housing. This makes it possible to easily adjust the relative relationship between the sensor and the detection object in the housing. Furthermore, this also makes it possible to safely adjust the relative relationship between the sensor and the detection object in the housing without removing the cover of the housing, for example, even if the housing is provided in an explosive atmosphere.

[0064] The sensor is a position detection sensor that detects the predetermined position of the detection object, and the adjustment unit adjusts the predetermined position of the detection object in a relative relationship. This makes it possible to easily adjust the predetermined position of the detection object. This also makes it possible to safely adjust the predetermined position of the detection object without removing the cover of the housing, for example, even if the housing is placed in an explosive atmosphere.

[0065] The adjustment unit adjusts the predetermined position of the detection object by adjusting the installation position of the sensor in the housing. This makes it possible to easily adjust the predetermined position of the detection object by adjusting the installation position of the sensor in the housing. This also makes it possible to safely adjust the predetermined position of the detection object by adjusting the installation position of the sensor in the housing without removing the cover of the housing, for example, even if the housing is placed in an explosive atmosphere.

[0066] In addition, the detection body is a movable body that moves inside the housing, and the predetermined position of the detection body is a position that indicates that the movable body is in a specific state. As a result, by adjusting the installation position of the sensor in the housing, it is possible to easily adjust the position that indicates that the detection body, which is a movable body, is in a specific state. In addition, as a result, even if the housing is placed in an explosive atmosphere, for example, it is possible to safely adjust the position that indicates that the detection body, which is a movable body, is in a specific state by adjusting the installation position of the sensor in the housing without removing the cover of the housing.

[0067] In addition, the position detection sensor detects a predetermined position by contacting the detection object. As a result, when the sensor is a position detection sensor that detects a predetermined position by contacting the detection object, the position indicating that the detection object, which is a movable object, is in a specific state can be easily adjusted by adjusting the installation position of the sensor in the housing. As a result, even when the housing is provided in an explosive atmosphere, for example, and the sensor is a position detection sensor that detects a predetermined position by contacting the detection object, the position indicating that the detection object, which is a movable object, is in a specific state can be safely adjusted by adjusting the installation position of the sensor in the housing without removing the cover of the housing.

[0068] The housing further includes a rotating shaft that communicates between the inside and outside of the housing, and the detection body moves in response to the rotation of the rotating shaft. As a result, when the sensor is a position detection sensor that detects a predetermined position by contacting with a detection body that moves in response to the rotation of the rotating shaft, the position of the sensor installed in the housing can be easily adjusted to indicate that the detection body, which is a movable body, is in a specific state. As a result, even when the housing is provided in an explosive atmosphere, for example, and the sensor is a position detection sensor that detects a predetermined position by contacting with a detection body that moves in response to the rotation of the rotating shaft, the position of the sensor installed in the housing can be safely adjusted to indicate that the detection body, which is a movable body, is in a specific state, without removing the cover of the housing.

[0069] In addition, the housing is explosion-proof, so that even if the housing is used in an explosive atmosphere, the installation position of the sensor in the housing can be adjusted without removing the cover of the housing, thereby allowing the predetermined position of the detection object to be adjusted safely while satisfying the explosion-proof requirements.

[0070] The housing further includes a coil for operating the spool valve. As a result, even if a housing including a coil for operating the spool valve is provided in an explosive atmosphere and the sensor is a position detection sensor that detects a predetermined position by contacting a detection body that moves in response to the rotation of the rotating shaft, the installation position of the sensor in the housing can be adjusted without removing the cover of the housing, thereby safely adjusting the position that indicates that the detection body, which is a movable body, is in a specific state while satisfying the explosion-proof requirements.

[0071] Furthermore, according to the housing 1 according to the above embodiment, the housing includes a rotating shaft that communicates between the inside and outside of the housing, a detection body, a cam mechanism that moves the detection body in a straight line according to the rotational motion of the rotating shaft, a sensor that detects the detection body in a specific state that has reached a predetermined position by the movement, and an adjustment unit. The adjustment unit has a base that supports the sensor, a rail that supports the base so that it can move along a straight line, a driving member formed as a rod-shaped member with at least one end exposed to the outside of the housing and supported rotatably around a longitudinal axis, and a conversion mechanism that converts the rotational motion of the driving member into the linear motion of the base along the rail, and adjusts the predetermined position of the detection body by applying a rotational force to one end to adjust the installation position of the sensor in the housing. Therefore, the adjustment unit adjusts the installation position of the sensor in the housing from the outside of the housing by a mechanism called a conversion mechanism that converts the rotational motion of the driving member into the linear motion of the base along the rail when a rotational force is applied to one end of the driving member. This makes it possible to adjust the installation position of the sensor in the housing with a simple mechanism without requiring a special mechanical device.

[0072] The driving member is a rod-shaped member having a screw thread formed on its outer periphery, the base has a hole having a screw groove corresponding to the screw thread formed on its inner periphery and extending along a straight line, and the conversion mechanism converts the rotational motion of the driving member into linear motion of the base along a rail by the engagement between the screw thread and the screw groove. Therefore, the adjustment unit adjusts the installation position of the sensor in the housing from outside the housing by a conversion mechanism, which is a mechanism that converts the rotational motion of the driving member into linear motion of the base along a rail via the engagement between the screw thread of the driving member and the screw groove of the base when a rotational force is applied to one end of the driving member. This makes it possible to adjust the installation position of the sensor in the housing with a simple mechanism of the screw thread and the screw groove without requiring any special mechanical device.

[0073] The housing is explosion-proof. Therefore, the adjustment unit adjusts the installation position of the sensor in the housing from outside the housing using a conversion mechanism, which converts the rotational motion of the drive member into linear motion of the base along a rail when a rotational force is applied to one end of the drive member. This makes it possible to adjust the installation position of the sensor in the housing safely and simply while meeting explosion-proof requirements without requiring any special mechanical device.

[0074] The housing further includes a coil for operating the spool valve. Therefore, the adjustment unit adjusts the installation position of the sensor in the explosion-proof housing from outside the housing that includes the coil for operating the spool valve by using a conversion mechanism, which converts the rotational motion of the drive member into linear motion of the base along a rail via the engagement between the screw thread of the drive member and the screw groove of the base when a rotational force is applied to one end of the drive member. This allows the sensor installation position to be adjusted in the housing that includes the coil for operating the spool valve with a simple mechanism that satisfies the explosion-proof requirements, for example, even in an explosive atmosphere, without requiring any special mechanical device. [Explanation of symbols]

[0075] 1...Housing, 2...Upper part of housing, 3...Lower part of housing, 10...rotation axis, 11...crank, 11a...crank groove, 12…detector, 13... guide plate, 13a... cam groove, 20...first adjustment section, 21...second adjustment section, 22…first rail, 23…second rail, 24…1st pedestal, 25…2nd pedestal, 26...first drive member, 26a...first operation unit, 27... second drive member, 27a... second operating portion, 28...first conversion mechanism, 29...second conversion mechanism, 30: first sensor; 31: second sensor; 40...Solenoid section, 50…Cap, 100... solenoid valve, 101... spool valve, 200: driving device, 210: cylinder, 211: piston rod 212A...first piston, 212B...second piston, 213... coil spring, 214... air supply / exhaust port, 215... transmission mechanism, 220…Second air pipe, 300...Main valve, 310...Pipe, 320... valve box, 321... valve body

Claims

1. A housing, A rotating shaft communicating between the inside and the outside of the housing; A detector; a cam mechanism that moves the detection body linearly in response to the rotational motion of the rotation shaft; a sensor that detects the detection object in a specific state that has reached a predetermined position due to the movement; An adjustment unit, The adjustment unit is a base supporting the sensor; a rail that supports the base so as to be movable along the straight line; a driving member formed as a rod-shaped member having at least one end exposed to the outside of the housing and supported rotatably about a longitudinal axis; a conversion mechanism for converting the rotational motion of the drive member into a linear motion of the base along the rail; and adjusting a predetermined position of the detection body by applying a rotational force to the one end to adjust an installation position of the sensor in the housing.

2. The driving member has a screw thread formed on the outer periphery of the rod-shaped member, the base has a hole on an inner periphery thereof, the hole having a thread groove corresponding to the thread and extending along the straight line; The conversion mechanism converts the rotational motion of the drive member into the linear motion of the base along the rail by the engagement between the screw thread and the screw groove. The housing of claim 1 .

3. The housing according to claim 1 or 2, wherein the housing is explosion-proof.

4. The housing of claim 3 , further comprising a coil for operating a spool valve.

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