Housing

Abstract

[Problem] To provide a housing comprising a means with which it is possible to adjust, from the outside of the housing, the relative relationship between a sensor installed inside the housing and a detection body to be detected by the sensor. [Solution] A housing 1 comprises: a sensor 30 installed inside the housing 1; a detection body 12 to be detected by the sensor; and an adjustment unit 20 that adjusts the relative relationship between the sensor 30 and the detection body 12 from the outside of the housing. Due to this configuration, the relative relationship between the sensor 30 and the detection body 12 can be adjusted from the outside of the housing 1, and therefore the relative relationship between the sensor 30 and the detection body 12 in the housing 1 can be safely adjusted even in an explosive atmosphere.

Description

chassis

[0001] The present invention relates to a housing.

[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 has been 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 adjustment valve in a draft chamber provided with a flow rate adjustment valve.

[0003] Japanese Patent Application Laid-Open No. 2003-106590

[0004] The draft chamber exhaust device disclosed in Patent Document 1 is provided with a mounting plate to which the limit switch is fixed that can be rotated continuously 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 operates the flow control 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 parts (ignition sources) that become hot due to overheating caused by electric sparks or electrical equipment failure that can cause ignition to the explosive gas vapor atmosphere, which poses a problem in that it is not possible to remove the cover of the housing and adjust the installation position of sensors such as limit switches in the housing to prevent fires or explosions.

[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 device is not exposed to explosive gases, and in some cases, other parts also need to be removed in order to remove the cover, which makes them difficult to maintain, and there is also the problem that it is not easy to adjust the relative relationship between the sensor and the 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.

[0008] The present invention solves 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 the target of detection by the sensor; and an adjustment unit that adjusts the relative relationship between the sensor and the detection object from outside the housing.

[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.

[0011] 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. 3 is a schematic view showing an adjustment means according to an embodiment of the present invention. FIG. 4 is an enlarged view of a cap 50 according to an embodiment of the present invention. FIG. 5 is a front view showing an example of a fluid pressure driven valve 4 including a housing 1 according

[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 i-i in Fig. 2.

[0014] The housing 1 is a box that forms the external appearance and shape of the device, and typically houses electrical equipment or machinery. The housing 1 has a roughly rectangular parallelepiped shape. The housing 1 is composed of an upper housing portion 2 and a lower housing portion 3. That is, the housing 1 can be separated into the upper housing portion 2 and the lower housing portion 3, and when the upper housing portion 2 is placed on top of the lower housing portion 3, the interior 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 comprises a rotating shaft 10 that connects 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 arranged 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 rotates in accordance 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 crank 11, a crank groove 11a, a guide plate 13, and a cam groove 13a as a cam mechanism for moving the detector 12 linearly in response to the rotational movement of the rotary shaft 10.

[0020] The crank 11 is made of a long, plate-like member. The rotating shaft 10 passes through one longitudinal end of the crank 11. The crank 11 and the rotating shaft 10 are fixed to each other. The crank 11 rotates around the axis of the rotating shaft 10 in accordance with the rotational movement 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. A 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 lower housing 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 linear elongated hole and semi-arc-shaped elongated holes are connected to the upper and lower ends of the linear elongated hole. The detector 12 is movable along the cam groove 13a in response to the rotational movement 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 body 12. The first sensor 30 and the second sensor 31 detect a predetermined position of the detection body 12 by contacting the detection body 12. For example, limit switches are used as the first sensor 30 and the second sensor 31 as position detection sensors that detect the predetermined position of the detection body 12. The limit switch includes an actuator, a cover, a built-in switch, and a switch case. The actuator transmits the force and movement received from the detection body 12 to the built-in switch via an internal plunger. The built-in switch instantly switches on and off using a snap action mechanism. An external connection cable is wired to the terminals of the built-in switch for power supply and signal transmission. The switch case protects the built-in switch.

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

[0025] The first adjustment unit 20 includes a first rail 22, a first base 24, a first drive 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 drive 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 one another.

[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 mounted on the upper part of the first pedestal 24 and the upper part of the second pedestal 25, respectively. Furthermore, the first pedestal 24 and the second pedestal 25 each have a hole extending along a straight line. A thread groove is formed on the inner periphery of each hole. A corresponding first driving member 26 and second driving member 27 are screwed into and pass through each hole.

[0029] Each of the first drive member 26 and the second drive member 27 is formed as a rod-shaped member with at least one end exposed to the outside of the housing 1 and supported by the housing 1 so as to be rotatable about its longitudinal axis. A screw thread is formed on the outer periphery of the rod-shaped member. Furthermore, a first operating portion 26a and a second operating portion 27a are formed on the end of the first drive member 26 exposed to the outside of the housing 1 and the end of the second drive member 27 exposed to the outside of the housing 1, respectively. Specifically, the first operating portion 26a and the second operating portion 27a are portions formed with a shape compatible with a tool such as a screwdriver. Therefore, by connecting a tool such as a screwdriver to the first operating portion 26a or the second operating portion 27a, the first drive member 26 or the second drive member 27 can be rotated about its 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 allowing 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 drive member 26 and a screw groove on the inner periphery of a hole in the first base 24. The engagement between the screw groove of the first base 24 (first conversion mechanism 28) and the screw thread of the first drive member 26 converts the rotational motion of the first drive member 26 into 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 drive member 27 and a screw groove on the inner periphery of a hole in the second base 25. The engagement between the screw groove of the second base 25 (second conversion mechanism 29) and the screw thread of the second drive member 27 converts the rotational motion of the second drive member 27 into 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 disposed within the solenoid coil. When the housing 1 functions as the housing for the solenoid valve 100, switching the energized state of the solenoid unit 40 operates a drive unit 200 (described below) connected to the solenoid valve 100. The detailed operation of the solenoid valve 100 will be described later.

[0032] FIG. 3 is a schematic diagram showing an example of an adjusting 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 element 12. The predetermined position of the detection element 12 is a position that indicates that the rotating shaft 10, which performs rotational motion in response to the reciprocating linear motion of the detection element 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 a 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. In other words, the first adjustment unit 20 and the second adjustment unit 21 can each adjust the relative relationship between the first sensor 30 and the detection element 12 or the second sensor 31 and the detection element 12 from outside the housing 1.

[0034] FIG. 3 shows the positional relationship among the cam groove 13a, the detector 12 fitted in the cam groove 13a, the first sensor 30, and the second sensor 31 when viewed from above inside the housing 1. Three positional relationships are shown in FIG. 3 . In each view of FIG. 3 , two detectors 12 are shown spaced apart in the vertical direction of the drawing for each cam groove 13a. This view shows the detector 12 when it reaches two predetermined positions due to the rotational movement of the rotary shaft 10. In reality, as shown in FIGS. 1 and 2 , there is only one detector 12. In FIG. 3 , for example, the detector 12 located below the cam groove 13a in the drawing represents the detector 12 that has reached the predetermined position representing the fully open state of the main valve, while the detector 12 located above the drawing represents the detector 12 that has reached the predetermined position representing the fully closed state of the main valve. The first sensor 30 and the second sensor 31 are installed at positions corresponding to the respective predetermined positions reached by the detector 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 upward on 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 a main valve with the rotating shaft 10 attached to it in a counterclockwise direction, for example. In this case, it is necessary to adjust the positions of the first sensor 30 and the second sensor 31 to position the detection body 12 in a predetermined position. To adjust the position of the first sensor 30, a tool such as a screwdriver is connected to the first operating unit 26a and the first drive member 26 is rotated counterclockwise, for example, to move the first sensor 30 away from the first operating unit 26a, i.e., toward the top of the paper in FIG. 3 . The second sensor 31 is also moved in a similar position adjustment manner. This allows the positions of the first sensor 30 and the second sensor 31 to be adjusted.

[0037] In the view on the right side of FIG. 3 , the positions of the two detection elements 12 are shifted downward in the drawing compared to the view in the center of FIG. 3 . The view on the right side of FIG. 3 shows, for example, a case in which the rotation shaft 10 is attached to the main valve with a clockwise offset. In this case, too, it is necessary to adjust the positions of the first sensor 30 and the second sensor 31 to correspond to the predetermined positions. By connecting a tool such as a screwdriver to the first operating part 26 a and rotating the first drive member 26, for example, clockwise, the first sensor 30 is moved in a direction toward the first operating part 26 a, i.e., toward the bottom of the drawing in FIG. 3 . The second sensor 31 is also moved using a similar position adjustment method. This allows the positions of the first sensor 30 and the second sensor 31 to be adjusted.

[0038] Although the above describes a 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, it is also possible to adjust the installation position of only one of the first sensor 30 or the second sensor 31. Furthermore, 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 housing 1 according to this embodiment, the cap 50 attached to the side surface of the housing 1 will be described.

[0040] The cap 50 has a function of covering the first operating unit 26a and the second operating unit 27a. By attaching the cap 50 to the first operating unit 26a and the second operating unit 27a, the installation position of the first sensor 30 or the second sensor 31 on the housing 1 is prevented from unintentionally moving if the operator inadvertently touches the first operating unit 26a or the second operating unit 27a. If the operator wants to adjust the installation position of the first sensor 30 or the second sensor 31, they 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 that constitutes 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 opens and closes the main valve 300 by driving a rotary shaft 10 connected to the main valve 300 in accordance with the fluid pressure of the driving fluid, 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 in the event of an emergency shutdown due to an abnormality in the plant facility. Note that the installation location and use of the fluid pressure driven valve 4 are not limited to the above example.

[0044] The fluid pressure driven valve 4 is supplied with air as an example of a driving fluid from an air supply source (not shown), and the air from the air supply source is supplied to the solenoid valve 100 via a first air pipe (not shown) and further supplied to the drive unit 200 via a second air pipe 220. A power cable (not shown) for supplying power from an external power source (not shown) to the solenoid valve 100 is also 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 an 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 also 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 configured, for example, as a valve called a ball valve. As an example of a configuration of the main valve 300, it 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, with a first end of the rotating shaft 10 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, switching the main valve 300 between a fully open state (the state shown in FIG. 5 ) and a fully closed state. The valve used as the main valve 300 is not limited to a ball valve, and may be another type of valve, such as a butterfly valve.

[0047] The drive unit 200 is disposed, for example, between the main valve 300 and the solenoid valve 100 and configured as a single-acting air cylinder mechanism. The drive unit 300 includes, as an example configuration, a cylindrical cylinder 210, a pair of pistons 212A and 212B that are linearly reciprocally movable within the cylinder and connected via a piston rod 211, a coil spring 213 provided on the side of the first piston 212A, an air supply / discharge port 214 formed on the side of the second piston 212B, and a transmission mechanism 215 provided at a portion where the rotation shaft 10 that is disposed radially through the cylinder 210 and the piston rod 211 intersect at right angles. The drive unit 200 is not limited to a single-acting type and may be configured in other ways, such as a double-acting type.

[0048] The first piston 212A is biased by a 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 an 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 rotary shaft 10.

[0049] The rotating shaft 10 is disposed rotatably and passes through the drive unit 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 journaled by the solenoid valve 100. The rotating shaft 10 may be formed by connecting a plurality of shafts together, for example, by a coupling or the like.

[0050] The solenoid valve 100 has a function of controlling the supply and exhaust of air to the drive unit 200 and is configured, for example, as a two-position, normally closed, three-way solenoid valve (open when energized, closed when de-energized). The solenoid valve 100 includes a spool valve 101 for switching the air flow path, located outside a housing 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) inside the housing 1 that displaces the spool valve 101 depending on the energized state (energized or de-energized). The solenoid valve 100 is not limited to a two-position, normally closed, three-way solenoid valve, but may also be a three-position, normally open, four-way solenoid valve, or the like, and may be configured in various forms based on any combination. In this 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 to connect the input port and the output port, and when not energized, displaces the spool valve 101 to connect the output port and the exhaust port.

[0053] Therefore, when the solenoid valve 100 is energized, air (supply air) from the air supply source flows in this order through the first air pipe, the input port, the output port, and the second air pipe 220, 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) inside the cylinder 210 flows from the air supply / discharge port 214 through the second air pipe 220, the output port, and the exhaust port in that order, and is then discharged to the outside air, thereby reducing the pressing force of the second piston 212B and restoring the coil spring 213 from 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 restoration of the coil spring 213, the valve element 321 rotates inside the valve box 320, and the main valve 300 is operated to a fully closed state.

[0055] While the present invention has been described above with reference to the preferred embodiments, it is not limited to the preferred embodiments and can be modified as appropriate without departing from the spirit and scope of the present invention.

[0056] For example, in the above embodiment, the sensors installed inside the housing 1 are limit switches that detect a predetermined position indicating that the movable detection body 12 is in a specific state, and two sensors, a first sensor 30 and a 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 as long as the detection body 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 sealed container, but it does not necessarily have to be sealed and may have gaps or openings. Furthermore, the housing 1 may not only be sealed but also be explosion-proof. In this case, in order for the housing 1 to be an explosion-proof container, it must satisfy explosion-proof design requirements, such as the gap between the mating surfaces of the first drive member 26 or the second drive member 27 facing the housing 1 being a predetermined length or less relative to the thickness of the housing 1. The same applies to the other gaps and openings mentioned above, which also satisfy explosion-proof design requirements. The explosion-proof type may be pressure-resistant explosion-proof, dust explosion-proof, intrinsically safe explosion-proof, or other explosion-proof design requirements appropriate for the purpose of the housing.

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

[0059] Furthermore, 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 if 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 , but the housing 1 does not necessarily have to have the solenoid unit 40 .

[0061] Furthermore, 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 drive member 26 and the second drive 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 drive member 26 and the second drive 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 drive member 26 and one end of the second drive 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 drive member 26 and the second drive 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 drive member 26 and one end of the second drive member 27.

[0062] Furthermore, in the above embodiment, two adjustment units, the first adjustment unit 20 and the 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; 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 of the above embodiment, the housing includes a sensor installed inside the housing, a detection object that is the 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 housing cover. 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 housing cover, for example, even if the housing is used 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 relative to the sensor. This makes it possible to easily adjust the predetermined position of the detection object. Furthermore, 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 used 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. Furthermore, this 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 used in an explosive atmosphere.

[0066] Furthermore, the detection body is a movable body that moves inside the housing, and a 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. Furthermore, as a result, even if the housing is used 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] Furthermore, 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 that indicates 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 that indicates 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 element moves in response to rotation of the rotating shaft. Thus, when the sensor is a position detection sensor that detects a predetermined position by contacting a detection element that moves in response to rotation of the rotating shaft, the position at which the movable detection element indicates that the detection element is in a specific state can be easily adjusted by adjusting the installation position of the sensor in the housing. Furthermore, even when the housing is used in an explosive atmosphere, for example, and the sensor is a position detection sensor that detects a predetermined position by contacting a detection element that moves in response to rotation of the rotating shaft, the position at which the movable detection element indicates that the detection element is in a specific state can be safely adjusted by adjusting the installation position of the sensor in the housing without removing the housing cover.

[0069] The housing is explosion-proof, so that even if the housing is used in an explosive atmosphere, the sensor installation position in the housing can be adjusted without removing the housing cover, allowing the predetermined position of the detection object to be adjusted safely while satisfying 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 object that moves in response to the rotation of the rotary 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 object, which is a movable object, is in a specific state while still satisfying explosion-proof requirements.

[0071] Furthermore, according to the housing 1 of the above embodiment, the housing includes a rotating shaft connecting the inside and outside of the housing, a detector, a cam mechanism that moves the detector linearly in response to the rotational movement of the rotating shaft, a sensor that detects the detector when it reaches a predetermined position and reaches a specific state, and an adjustment unit. The adjustment unit includes a base that supports the sensor, a rail that supports the base so that it can move linearly, a drive member formed as a rod-shaped member with at least one end exposed to the outside of the housing and supported rotatably about its longitudinal axis, and a conversion mechanism that converts the rotational movement of the drive member into linear movement of the base along the rail. The predetermined position of the detector is adjusted by applying a rotational force to one end of the drive member, thereby adjusting the installation position of the sensor in the housing. Therefore, the adjustment unit adjusts the installation position of the sensor in the housing from outside the housing using a conversion mechanism, a mechanism that converts the rotational movement of the drive member into linear movement of the base along the rail when a rotational force is applied to one end of the drive member. This allows the installation position of the sensor in the housing to be adjusted using a simple mechanism without requiring any special mechanical equipment.

[0072] The drive member is a rod-shaped member having a screw thread formed on its outer periphery, and the base has a hole on its inner periphery with a screw groove corresponding to the screw thread and extending along a straight line, and the conversion mechanism converts the rotational motion of the drive member into linear motion of the base along a rail through the engagement of 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 using a conversion mechanism, which converts the rotational motion of the drive member into linear motion of the base along a rail through the engagement of 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 makes it possible to adjust the installation position of the sensor in the housing using a simple mechanism of screw threads and screw grooves without requiring any special mechanical device.

[0073] The housing is explosion-proof. Therefore, the adjustment unit adjusts the sensor's installation position in the housing from outside the housing using a conversion mechanism, which converts the rotational movement of the drive member into linear movement of the base along a rail when a rotational force is applied to one end of the drive member. This allows the sensor's installation position in the housing to be adjusted safely and simply while meeting explosion-proof requirements, without the need for special mechanical devices.

[0074] The housing also includes a coil that operates the spool valve. Therefore, the adjustment unit adjusts the installation position of the sensor in the explosion-proof housing from outside the housing, using a conversion mechanism that converts the rotational motion of the drive member, when a rotational force is applied to one end 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. This allows the installation position of the sensor in the housing, which is explosion-proof and includes the coil that operates the spool valve, to be adjusted safely and with a simple mechanism, without requiring any special mechanical equipment, while still meeting explosion-proof requirements, even in an explosive atmosphere.

[0075] DESCRIPTION OF SYMBOLS 1...housing, 2...upper housing, 3...lower housing, 10...rotating shaft, 11...crank, 11a...crank groove, 12...detecting body, 13...guide plate, 13a...cam groove, 20...first adjustment section, 21...second adjustment section, 22...first rail, 23...second rail, 24...first base, 25...second base, 26...first driving member, 26a...first operation section, 27...second driving member, 27a...second operation section, 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 / discharge port, 215... Transmission mechanism, 220... Second air piping, 300... Main valve, 310... Piping, 320... Valve box, 321... Valve body

Claims

1. A housing comprising: a sensor installed inside the housing; a detection object that is the 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.

2. The housing according to claim 1, wherein the sensor is a position detection sensor that detects a predetermined position of the detection object, and the adjustment unit adjusts the predetermined position of the detection object as the relative relationship.

3. The housing according to claim 2, wherein the adjustment unit adjusts the predetermined position of the detection object by adjusting the installation position of the sensor in the housing.

4. The housing according to claim 3, wherein 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.

5. The housing according to claim 4, wherein the position detection sensor detects the predetermined position by contacting the detection object.

6. The housing according to claim 5, further comprising a rotating shaft that connects the inside and outside of the housing, and the detection element is movable in response to rotation of the rotating shaft.

7. The housing according to any one of claims 1 to 6, wherein the housing is explosion-proof.

8. The housing of claim 7, further comprising a coil for operating a spool valve.

9. A housing comprising: a rotating shaft communicating the inside and outside of the housing; a detecting body; a cam mechanism that moves the detecting body in a straight line in accordance with the rotational movement of the rotating shaft; a sensor that detects the detecting body in a specific state when it reaches a predetermined position as a result of said movement; and an adjustment unit, wherein the adjustment unit has: a base that supports the sensor; a rail that supports the base so that it can move along the 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 so that it can rotate about a longitudinal axis; and a conversion mechanism that converts the rotational movement of the driving member into linear movement of the base along the rail, and by applying a rotational force to the one end, the installation position of the sensor in the housing is adjusted, thereby adjusting the predetermined position of the detecting body.

10. The housing of claim 9, wherein the driving member has a screw thread formed on the outer periphery of the rod-shaped member, the base has a hole on the inner periphery with a screw groove corresponding to the screw thread formed and extending along the straight line, and the conversion mechanism converts the rotational motion of the driving member into linear motion of the base along the rail by the engagement between the screw thread and the screw groove.

11. The enclosure of claim 9 or claim 10, wherein the enclosure is explosion-proof.

12. The housing of claim 11, wherein the housing further comprises a coil for operating a spool valve.

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