JP2019164233A - In-factory safety sign projection device - Google Patents

Abstract

To provide an in-factory safety sign projection device capable of always displaying a safety sign which is not damaged or deteriorated and preventing occurrence of an accident or the like caused by changing display contents of the safety sign, at a desired place including a floor surface in a factory even in an inferior environment with high temperature, scattering of dust and oscillation.SOLUTION: An in-factory safety sign projection device 10 comprises a projector 13 for projecting a safety sign 12 onto a floor surface near a secondary material supply port 11 in an iron mill, and a dust-proof box 16 storing the projector 13 therein and having a window part 15 into which tempered glass 14 through which projection light from the projector 13 passes is fit. The device further comprises a first display change switch 62 that an operator at the site performs input operation, a second display change switch 67 that an operator at a control room 79 performs input operation, and projected image change means 61 for changing the safety sign 12 only at the time of simultaneous input of both display change switches 62 and 67.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an in-factory safety sign projecting apparatus that projects a safety sign on a necessary location in a factory in order to ensure the safety of workers engaged in various operations in the factory.

  For example, in the vicinity of the auxiliary material inlet for supplying auxiliary material to the blast furnace in the steelworks premises, the indoor temperature is 50 ° C or higher due to the radiant heat when melting iron, the molten iron scatters and the slag dust also dances Environment. Also, on this premises, special heavy machinery with a load capacity of 100 tons or more frequently come and go, so there is always an earthquake-like vibration, and more than 1,000 large trucks come and go a day. .

  In such a steelworks, slight contact with a passing vehicle leads to a serious accident. Therefore, various safety measures have been taken for workers to designate dangerous areas, display the presence of dangerous goods, and call attention. For example, a safety fence for pedestrian separation is installed on the floor of the premises (Non-patent Document 1, etc.), and a stand-type safety sign or a road surface sign is painted in a restricted area (Non-patent) Reference 2).

[Search October 7, 2017], Internet <URL: http://anzeninfo.mhlw.go.jp/anzenproject/concour/2015/sakuhin1/images/n071_1.pdf [Search October 7, 2017], Internet <URL: http://fukuyama-energypark.com/wp-content/uploads/2016/02/img_routeB01.jpg

However, because special heavy machinery and heavy trucks frequently come and go in the steelworks, for example, in the case of safety fences, these vehicles come into contact with the safety fences, and the concrete for embedment is safety fences. Was damaged. In addition, in the case of a stand-type safety sign, it has been overturned due to vibrations when the vehicle travels. In addition, the road surface on the premises was severely scraped by running special special heavy machinery, and cracks, distortions, dents, etc. occurred in concrete and asphalt. Moreover, slag dust of several centimeters per day is accumulated on the floor surface in the premises of the steelworks. As a result, the safety signs painted on the road surface were not visible.
Workers in the steelworks are also obliged to use special dust masks that are difficult to breathe and narrow the field of view in order to avoid health hazards due to suction of dust. Combined with its influence, such conventional safety measures have not been able to fully perform their functions.

Therefore, as a result of earnest research, the inventor has paid attention to an image projection technique for projecting a predetermined image onto a building, an object, or a space by a projector. That is, it has been found that if the safety sign is projected onto the road surface of the premises, all the above-mentioned problems are solved.
Further, since the projector is a precision device, it cannot withstand use in the above-mentioned poor indoor environment. Based on this, the inventor can use the projector without any trouble even in a poor environment such as the above-mentioned steel works if the projector is housed in a special protective box with temperature adjustment function, dustproof function, and antivibration function. As a result, the present invention was completed.

By the way, the display content of the safety sign may need to be changed according to the situation of the premises or the situation of work. At that time, if a worker at the site changes the display contents based on the status of the site without grasping the entire premises or the status of the entire work, a serious accident may occur.
Therefore, as a result of earnest research, the inventor has confirmed that the safety sign must be displayed unless the operator who grasps the situation of the site and the operator of the control room that is remote from the site and controls and manages the entire steelworks operate simultaneously. The present invention has been completed by discovering that an interlock mechanism in which display contents cannot be changed should be adopted.

  The present invention has been made in view of such problems, and it is desirable to include a floor surface in a factory without causing a projector to malfunction even in a poor environment where dust is scattered and vibration is generated at high temperatures. The purpose is to provide an in-factory safety sign projection device that can always display safety signs that are not damaged or deteriorated at locations, and that can prevent accidents caused by changes in the display contents of safety signs. It is said.

  According to the first aspect of the present invention, a projector for projecting a safety sign and a translucent plate through which projection light from the projector passes are fitted into a predetermined location including a road surface in a factory. A dust-proof box having a window portion, and the dust-proof box includes a vibration-proof member for reducing vibrations generated in the factory from being transmitted to the projector, and a cooler for cooling the dust-proof box. A safety sign projecting apparatus disposed in a factory, wherein the first safety sign is provided in the vicinity of a predetermined location in the factory and input by a field worker when changing the projected safety sign. A display change switch is provided in a control room that controls and manages the operation state of the factory at a location away from the site, and an operator of the control room performs an input operation when changing the projected safety sign. The safety sign projected from the projector to a predetermined location in the factory is changed only when the second display change switch, the first display change switch, and the second display change switch are simultaneously input. An in-factory safety sign projection apparatus characterized by comprising projection image changing means.

The “factory” where the factory safety sign projection device is used is not limited. However, for example, a factory where the campus environment is dusty and vibrates at high temperatures, such as steelworks, foundries, coal-fired power plants, and garbage incinerators, is more effective. Therefore, it is preferable.
The safety sign is not limited as long as it can be projected by the projector. For example, there are signs that specify various dangerous areas, signs that indicate the presence of various dangerous goods, signs that call various attentions, and the like.
The safety sign may be a still image or a moving image.
The location where the safety sign is displayed is arbitrary as long as it is in a factory (including outdoors in the site). For example, a factory floor surface (floor surface), a road surface, a wall surface, a ceiling surface, an exposed surface of the apparatus, and the like can be employed.

The type of projector is arbitrary. For example, a liquid crystal projector, a CRT (Cathode Ray Tube) projector, a DLP (Digital Light Processing: registered trademark) projector, an LCOS (Liquid Crystal On Silicon) projector, a GLV (Grating Light Valve) projector, or the like can be employed.
The projector may be equipped with image correction means (circuit) for correcting deformation of the safety sign projected obliquely. As the image correction means, for example, a trapezoidal (distortion) correction function or the like can be employed.
As a method of inputting image data of safety signs to the projector, for example, data using a USB or SD card in addition to a cable connection with various terminals such as a controller, a personal computer, a tablet, a smartphone, or a wireless LAN connection. Input can be employed.
The projector may be attached to the dust-proof box using a fixed method or a movable (tilting) method. If the movable system is adopted, the safety sign can be easily positioned (mapped) to a predetermined location in the factory. Note that the dustproof box may be movable (tilted) instead of the projector.

As a material of the dustproof box, for example, various metals, various synthetic resins, and the like can be employed. In the case of a synthetic resin, a heat resistant one is preferable.
The shape of the dustproof box is arbitrary. For example, a box with a six-sided rectangular shape may be used.
The dust-proof box may have a vent hole if it is not completely sealed as long as measures are taken to prevent dust from entering.

As a dust-proof measure for the dust-proof box, for example, a completely sealed structure of the box, various filters provided in the vents, and a seal member interposed between the compressor storage port and its lid Can do.
The installation location of the dustproof box in the factory is arbitrary. For example, a factory wall or ceiling can be employed. Alternatively, a dust box may be attached to these members by setting up a pole on the floor or fixing a beam to the wall.
The dustproof box may be fixed or mobile (portable). If it is mobile, when a safety sign is urgently needed due to an emergency or the like, the factory safety sign projection device can be moved to that location and used.
The translucent plate is a transparent (including translucent) plate material through which light emitted from the projector is transmitted.
As a material of the light transmitting plate, for example, synthetic resin such as acrylic or polycarbonate, glass, or the like can be used. Of these, heat resistant ones are preferred.
The shape and size of the window part are arbitrary. Moreover, the formation position of the window part in a dustproof box is also arbitrary.

Here, “vibration generated in the factory” means all vibrations generated in the factory that affect the projector. For example, vibrations when a large vehicle travels in a factory, vibrations when a large apparatus deployed in the factory operates, and the like can be mentioned.
The material of the vibration isolation member is arbitrary. For example, various elastomers (thermosetting resin type or thermoplastic resin type), particularly urethane gel or silicone gel excellent in vibration-proofing properties can be employed. In addition, various rubbers, various damping springs, various cushioning materials, and the like may be employed.
The shape of the vibration isolating member is arbitrary. For example, it may be a sheet shape or a block shape.
The size of the vibration isolation member is not limited as long as the vibration isolation effect is obtained.
Further, the vibration isolating member may be laminated in a plurality of stages via various members (plates or the like).
The kind of cooler is not limited. For example, an air cooler that injects cold air simply by supplying compressed air to the internal flow path can be employed. In addition, various heat exchangers may be used.
The cooler may be arranged inside the dustproof box or outside the box.

The term “site” as used herein refers to a predetermined area in a factory where a safety sign is projected and displayed.
A worker means a person who is engaged in various kinds of work on this site.
The control room may be arranged either in the factory or outside the factory.
As the operator, for example, a factory (control room) manager, a technician, a factory safety manager, or the like can be employed.

The type of the first display change switch (the same applies to the second display change switch) is not limited. For example, a push button switch, a toggle switch, a key switch, a slide switch, a rotary switch, or the like can be employed. In addition, various touch switches such as a capacitance type may be used.
Further, the number of first and second display change switches is not limited. For example, it may be one or more.
“In the vicinity of a predetermined location in the factory” where the first display change switch is provided refers to the vicinity of the location where the safety sign is displayed by the projector.
A method of performing an input operation on the first display change switch and the second display change switch simultaneously is arbitrary. For example, the operator may press and hold the second display change switch (maintain the input state) while the operator inputs the first display change switch. Or vice versa. That is, the change of the safety sign may be operator-driven or site-driven. In addition, the first display change switch and the second display change switch may be input simultaneously at a preset input time.

  Means for notifying the other party of the timing for simultaneously inputting and operating the first display change switch and the second display change switch between the worker on site and the operator of the control room is arbitrary. For example, in the case of changing the safety sign led by an operator, the control room of the factory is provided with a transmission means for transmitting a simultaneous input notification signal to notify the worker at the site of simultaneous input, while at a predetermined location in the factory May be provided with a notification means for receiving a notification signal at the time of simultaneous input and notifying an on-site worker of the input operation of the first display change switch. As the notification means, for example, a light such as an LED, for example, a chime or a buzzer, for example, an electronic sound generator, for example, an electric bulletin board for displaying characters or images, and the like can be adopted.

  The projection image changing means is limited as long as it can project another safety sign from the projector to a predetermined location in the factory only when the first display change switch and the second display change switch are input simultaneously. Not. For example, having a simultaneous input detection circuit of a first display change switch and a second display change switch, a storage unit storing image data of another safety sign, and a control unit of these electronic devices Etc. In this case, when the simultaneous input detection circuit detects the simultaneous input of the first display change switch and the second display change switch, another image data stored in the storage unit is sent to the projector by a command from the control unit. Sent. Thereby, the image of the safety sign projected on the predetermined location in the factory is changed.

  In the invention according to claim 2, the number of the safety signs is plural, and the display contents of the respective safety signs are different, and a plurality of the safety signs corresponding to the respective safety signs are present in the vicinity of a predetermined location in the factory. A first switch box in which a first display change switch is arranged is provided, and a second switch box in which a plurality of the second display change switches corresponding to the respective safety signs are arranged in the control room. The projected image changing means includes a simultaneous input detection circuit that detects simultaneous inputs of the first display change switch and the second display change switch corresponding to the predetermined safety sign, and A storage unit for storing image data of a sign, and the first display change switch and the second display change switch detected by the simultaneous input detection circuit from the image data stored in the storage unit When The in-factory safety according to claim 1, further comprising: an image selection circuit that selects corresponding image data, and transmits the selected image data to the projector; and a control unit of these electronic devices. It is a sign projection device.

The shape and size of the first and second switch boxes are arbitrary.
Further, the number of the first and second display change switches in the first and second switch boxes and the arrangement thereof are arbitrary as long as they are plural. However, it is preferable that they be the same. Further, in each switch box, it is preferable to attach a number or a symbol for displaying what image data corresponds to each switch or an arrangement portion of each switch.
Each switch box may be provided with illumination such as an LED so that each switch can be easily recognized even in the dark.
Each of the first and second display change switches of the first and second switch boxes is electrically connected to the projection image changing unit wirelessly or by wire. These may be connected using an Internet line.

As the projection image changing means here, only at the time of simultaneous input of the first display change switch and the second display change switch corresponding to a predetermined (one) safety sign, from the projector to a predetermined place in the factory, Any configuration capable of projecting the predetermined (another) safety sign is optional.
For example, various AND circuits can be adopted as the simultaneous input detection circuit.
As the storage unit, for example, a random access memory (RAM), a read only memory (ROM), or the like can be employed.
As the control unit, for example, a control unit incorporating a central processing unit (CPU) can be adopted.
When the simultaneous input detection circuit detects the simultaneous input of the first display change switch and the second display change switch corresponding to the predetermined safety sign, the image selection circuit is stored in the storage unit by a command from the control unit. Corresponding image data is selected from a plurality of stored image data. Thereafter, the selected image data is transmitted to the projector, and the safety sign projected at a predetermined location in the factory is changed.

  According to a third aspect of the present invention, the input field of each first display change switch of the first switch box is always in an exposed state in the environment where the site is at a high temperature and dust is scattered. The switch box 1 has a fan for air-cooling the inside of the box, and blows exhaust air after air-cooling to a zone of each input operation surface to remove dust adhering to each input operation surface. The in-factory safety sign projection device according to claim 2, further comprising dust removing means.

Examples of the site where the environmental temperature is high and dust is scattered include, for example, the premises of steelworks and thermal power plants.
The input operation surface of the first display change switch is the surface of the first display change switch that comes into contact with the finger of the worker on site.
The configuration of the air cooling / dust removing means is not limited. For example, a fan that is housed in a first switch box and cools the electrical system (such as a control panel) of each first display change switch, and extends from an exhaust port formed in a part of the box, It is possible to employ one having an air blowing duct for blowing exhaust air after air cooling onto the input operation surface exposed to the outside of each first display change switch. Even if the duct is not provided, for example, the target effect can be obtained only by arranging the exhaust port in the vicinity of the installation position of each first display change switch.

According to the present invention, the projection light of the safety sign irradiated from the projector is irradiated to a predetermined location including the road surface in the factory through the window portion in which the light transmission plate of the dustproof box is fitted. As a result, even if a large amount of dust accumulates at the predetermined location where the safety sign is projected, or the shape of the predetermined location changes for some reason, a safety sign that does not break or deteriorate is always attached to the predetermined location. Can be displayed.
In addition, since the projector is housed in a dust-proof box cooled by a cooler, for example, not only dust is scattered in this way, but also in a factory that is in a high temperature environment, It can be used without failure due to high temperature or dust.
Furthermore, a vibration-proof member is provided in the dust-proof box. Therefore, the vibration generated in the factory is alleviated by the vibration isolating member and transmitted to the projector. As a result, it is possible to prevent a projector failure caused by vibrations in the factory.

In addition, when the safety sign projected from the projector is changed, the operator in the field inputs the first display change switch and, at the same time, the control room operator inputs the second display change switch. Only when both of these input conditions are met, the projection image changing means is operated to project another safety sign from the projector to a predetermined location in the factory.
In this way, the display contents of the safety signs projected at a predetermined location in the factory cannot be changed unless the operator who understands the site situation and the operator of the control room located away from the site operate simultaneously. Because it is configured, the site situation (such as on-site safety confirmation) is not grasped, the operator unilaterally changes the safety sign, accidents that occur unilaterally, and the operation status of the factory is not grasped, the operator's discretion Accidents and the like caused by changing the safety sign can be prevented.

In particular, according to the second aspect of the present invention, when the simultaneous input detection circuit detects the simultaneous input of the first display change switch and the second display change switch corresponding to a predetermined safety sign, The image selection circuit outputs image data corresponding to the first display change switch and the second display change switch detected by the simultaneous input detection circuit from the plurality of image data stored in the storage unit in response to a command from the unit. elect. Thereafter, the selected image data is transmitted to the projector, so that the safety sign projected at a predetermined location in the factory is changed.
As described above, only when the first and second display switches corresponding to the predetermined safety sign among the plurality of first and second display change switches are simultaneously input and operated, they are projected to a predetermined location in the factory. Since the safety sign can be changed, the interlock mechanism can be incorporated into the change of the safety sign using the first and second switch boxes.

  Further, according to the present invention as set forth in claim 3, each first display change is made by operating the fan of the air cooling / dust removing means in the first switch box in the field environment where dust is scattered at a high temperature. It is possible to cool the electrical system of the switch, etc., and to suppress troubles caused by heat of the electrical system. Moreover, the dust adhering to each input operation surface can be removed by spraying the exhaust air after air cooling to a zone of each input operation surface. Thereby, the poor visual recognition of each 1st display change switch resulting from adhesion of dust can be eliminated.

It is a whole block diagram which shows the use condition of the safety sign projection apparatus in a factory which concerns on Example 1 of this invention. It is a longitudinal cross-sectional view along the length direction of the safety sign projection apparatus in a factory which concerns on Example 1 of this invention. It is a longitudinal cross-sectional view orthogonal to the length direction of the safety sign projection apparatus in a factory which concerns on Example 1 of this invention. It is a cross-sectional view of the in-factory safety sign projection apparatus according to the first embodiment of the present invention. It is a principal part expanded horizontal sectional view which shows the connection state of the cooler and cooling control means which comprise some factory safety sign projectors which concern on Example 1 of this invention. It is a principal part expanded longitudinal sectional view which shows the connection structure of the projector and beam board which comprise a part of factory safety sign projection apparatus which concerns on Example 1 of this invention. It is a principal part expanded vertical sectional view which shows the other connection structure of the projector and beam board which comprise a part of factory safety sign projection apparatus which concerns on Example 1 of this invention. It is a block diagram of the electric system of the controller which comprises a part of the factory safety sign projection apparatus which concerns on Example 1 of this invention.

  Examples of the present invention will be specifically described below. Here, an example of displaying a safety sign prohibiting the supply of secondary material in the vicinity of the secondary material supply port for supplying secondary material to the blast furnace in the steelworks premises is taken as an example. However, it is not limited to this.

  In FIG. 1, reference numeral 10 denotes an in-factory safety sign projection apparatus according to Embodiment 1 of the present invention. This in-factory safety sign projection apparatus 10 supplies auxiliary materials from a vehicle to a blast furnace in a steelworks premises (in the factory) ( A projector 13 for projecting a safety sign 12 for restricting the supply of secondary materials other than those designated on the floor in the vicinity of the secondary material supply port (predetermined location) 11 for charging, and the projector 13 And a dustproof box 16 having a window portion 15 in which a tempered glass (translucent plate) 14 through which projection light from the projector 13 passes is fitted.

Hereinafter, these components will be specifically described.
As shown in FIGS. 1 to 4, the projector 13 is a large-sized (width of about 60 cm, height of about 20 cm, depth of about 50 cm) projection device adopting a three primary color liquid crystal shutter type projection system, and its weight is about 20 kg. . A projection lens 17 is disposed at the center of the front surface of the projector 13 disposed downward.
The projector 13 has an operating temperature of 0 ° C. to 45 ° C., is equipped with a geometric distortion correction function, and is controlled by a controller 60 fixed to a wall near the site via a wired LAN. As the controller 60, a controller based on “BrightSign / XD233” of Japan Material Co., Ltd. is employed. By using the controller 60, the image data of the predetermined safety sign 12 is transmitted to the projector 13, and the image of the safety sign 12 is projected from the projector 13 onto the floor surface near the auxiliary material supply port 11. The controller 60 of the first embodiment is provided with a projected image changing unit 61 that changes the safety sign 12 projected from the projector 13 to the vicinity of the auxiliary material supply port 11. Details of the controller 60 will be described later.

  The safety sign 12 is, for example, “a road sign for prohibiting the supply of secondary material (a sign for calling attention)” that surrounds the horizontally wide secondary material supply port 11 in a U-shape. On each side (frame) of the U-shaped character, a bold Chinese character “Prohibit Supply” is displayed by changing the direction of the character as appropriate for easy reading. Here, the image data sent from the controller 60 to the projector 13 is still image data, but may be predetermined moving image data.

  The dust-proof box 16 is connected to each of the wall plates (including the lid body 20) constituting six surfaces with a frame composed of a plurality of angles arranged on each side portion, and approximately 10 cm from these wall plates. This is a metal rectangular box in which the projector 13 can be stored in the center of the dustproof box 16 in a state of being spaced apart from each other. In the dustproof box 16, projection light is irradiated almost directly below one side surface of the concrete beam 18 disposed in the vicinity of the auxiliary material supply port 11 via an inclined bracket 19 whose box fixing surface is inclined downward. It is fixed to. That is, the dust-proof box 16 is in a posture in which the front plate (wall plate) 16a faces downward when fixed to the concrete beam 18 (when used). However, here, for convenience of explanation, the dustproof box 16 will be described in an original posture with the front plate 16a facing forward.

An opening 16 b for performing maintenance of the projector 13 is formed on the entire lower surface of the dustproof box 16. The opening 16b is closed by a screw-type (or door-type) lid 20. A rectangular frame-shaped dust-proof rubber seal (dust-proof member) 21 is fitted into the opening 16b over the entire circumference. Thereby, intrusion of dust from the closed opening 16b is prevented.
Furthermore, a rectangular window portion 15 through which projection light from the projector 13 passes is formed over the entire central portion of the front plate 16a of the dustproof box 16. The window portion 15 is closed with a transparent tempered glass 14. Between the window portion 15 and the tempered glass 14, a rectangular buffer seal frame 22 made of rubber also serving as a dustproof member is sandwiched.

A metal beam plate 23 spaced apart from the upper plate (wall plate) 16d of the dustproof box 16 is horizontally mounted by a plurality of bolts and nuts on the center front side portion of the upper portion of both side plates (wall plates) 16c of the dustproof box 16. ing.
The central portion of the upper plate 13 a of the projector 13 is connected to the lower surface of the intermediate portion in the length direction of the beam plate 23 via the ceiling hanging bracket 25. Thereby, the projector 13 is suspended from the beam plate 23. The ceiling hanger 25 has a lower metal fitting 26 on the projector 13 side made of a rectangular metal plate, and an upper metal fitting 27 on the beam plate 23 side made of a rectangular metal plate slightly smaller than this.
At this time, the connecting structure of the beam plate 23 and the upper metal part 27 is such that only the upper part of the upper metal part 27 is formed in a large rectangular opening formed in the middle part of the beam plate 23 in the longitudinal direction, leaving only the outer peripheral part. Is inserted between the corners of the rectangular frame-shaped outer flange provided around the upper part of the upper metal fitting 27 and the corners of the outer periphery forming part of the opening of the beam plate 23. These are connected by a total of four bolt-nut structures B with the vibration isolating member 24, which is a cylindrical body, sandwiched therebetween (FIG. 6).

The projector 13 may be suspended from the beam plate 23 by bolting the upper bracket 27 of the ceiling suspension bracket 25 to the lower surface of the beam plate 23 (FIG. 7). Specifically, the four vibration isolation members 24 are sandwiched between the beam plate 23 and the upper metal fitting 27 and are connected by the four bolt nut structures B. In this case, in the bolt and nut structure B, a washer side vibration isolator 24A having a diameter smaller than that of the vibration isolator 24 and a thin wall is interposed between the washer 51 and the beam plate 23 with which the nut 50 abuts. Thus, as the vibration-proof resin for each bolt and nut structure B, not only the vibration-proof member 24 but also the washer-side vibration-proof member 24A is adopted, so that the washer 51 comes into direct contact with the upper surface of the beam plate 23. It is possible to eliminate a decrease in the vibration isolation effect of the vibration isolation member 24.
The anti-vibration member 24 is for mitigating the vibration generated in the steelworks from being transmitted to the projector 13. Specifically, a low-hardness urethane gel (for example, Shore C hardness 40 °) having a diameter of 40 mm and a thickness of 21 mm is employed.

Four lower flanges 28 projecting upward are integrally formed at the front, rear, left and right ends of the lower metal fitting 26, respectively. Further, four upper flanges 29 projecting downward are integrally formed at the front, rear, left and right ends of the upper metal fitting 27, respectively.
Among the flanges, corresponding flanges 28 and 29 arranged on the left and right sides are rotatably connected by a pair of left and right short front and rear swinging combination shafts 30 that can tilt the projector 13 in the front and rear direction. Yes. The front / rear swinging combined shaft 30 includes a rotation shaft 30a disposed at the front end portions of the left and right flanges 28 and 29, and a long arc-shaped length disposed at the rear end portions of the left and right flanges 28 and 29. The rotation angle fixing shaft 30b is screwed into the hole.
Further, the corresponding flanges 28 and 29 arranged on the front and rear sides are rotatably connected by a pair of front and rear short swing shafts 31 that allow the projector 13 to tilt in the left and right direction.

Further, as shown in FIGS. 2, 4, and 5, an air cooler (cooler) 32 that cools the inside of the dustproof box 16 is provided on one side of the upper end portion of the rear plate (wall plate) 16 e of the dustproof box 16. The tip is cantilevered with the cold air outlet 33 disposed in the dustproof box 16. The air cooler 32 is an ultra-low temperature air generator (spot cooling device) made of a vortex tube and injects ultra-low temperature air of −40 ° C. into the dustproof box 16.
The air cooler 32 has a structure in which the cold air outlet 33 is formed at the tip, a compressed air inlet 32a is formed in the body, and a generator (vortex generator) (not shown) is provided. A tubular main body 34, and an elongated heat exchange tube 36 having one end communicating with the proximal end opening of the main body 34 and a rectifying plate (not shown) built in the other end with the hot air discharge port 35. Have.

  When the air cooler 32 is used, if compressed air from a compressor 38, which will be described later, is supplied to the inlet port 32a, the compressed air becomes a vortex that rotates at high speed in the generator. Thereafter, the vortex flows into the heat exchange pipe 36 and advances toward the hot air outlet 35 while rotating in the pipe at a high speed. At this time, the compressed air moves while spirally rotating in the vicinity of the outer peripheral portion of the internal space of the heat exchange pipe 36 by the action of centrifugal force. Thereafter, when the compressed air reaches the other end (terminal portion) of the heat exchange pipe 36, it collides with the rectifying plate, becomes non-rotating, and is released into the atmosphere from the hot air exhaust port 35. Here, a residual pressure is generated by restricting the amount of compressed air flowing out, and then this residual pressure becomes a reflected wave of the rotational motion of the compressed air braked by the rectifying plate, The core part moves in the direction of a counter-rotating vortex toward the generator. At this time, the temperature inside the vortex decreases due to the principle of the vortex tube. That is, when the reverse rotating vortex passes through the core of the vortex toward the hot air outlet 35, the reverse rotating vortex expands and works on the outer vortex by the braking action by the deceleration. As a result, the temperature of the outer vortex increases, and the temperature of the vortex in the center decreases. The pressure wave of the compressed air thus lowered in temperature passes through the generator and is discharged from the cold air discharge port 33.

The introduction port portion 32 a of the main body portion 34 is in communication with a predetermined compressor 38 provided in the steelworks premises via an air pipe 37. A dry filter 39 and an electromagnetic valve 40 are connected to a middle portion of the air pipe 37 in order from the downstream.
Among these, although not shown, the dry filter 39 is arranged in parallel with the first cylinder to which the compressed air from the compressor 38 is supplied, the spiral first element accommodated therein, and the first cylinder. The second cylinder, a second element made of special cotton (cotton) housed in the second cylinder, and a communication portion between the first cylinder and the second cylinder are provided to flow from the first element. It is equipped with an auto drain that automatically discharges drain (water) to the outside.

When the dry filter 39 is used, compressed air from the compressor 38 is supplied to the first cylinder. Here, when compressed air passes through the first element, large and small water droplets contained in the compressed air are combined, and impurities in the compressed air are collected and flow into the auto drain as bean-sized water droplets. . In the auto drain, large water droplets that have flowed in are automatically discharged to the outside. After that, the compressed air flowing into the second cylinder removes water droplets, oil droplets and solid particles of 3 μm or more by the second element made of special cotton, and the same vacuum as the tornado when passing through the second element. A part is generated and water droplets are vaporized to become dry air. Thereafter, the obtained dry air from which “oil, moisture, and fine particles” are removed is returned to the air pipe 37 and supplied to the air cooler 32.
The electromagnetic valve 40 is an automatic valve that opens and closes the air pipe 37.

As shown in FIG. 4 and FIG. 5, the corner portion on the lower front side of the one side plate 16 c of the dustproof box 16 has a temperature sensor 41 that detects the temperature in the dustproof box 16, and is obtained from the temperature sensor 41. A liquid expansion type thermostat (cooling control means) S for operating the air cooler 32 when the temperature value in the dustproof box 16 exceeds the upper limit value of the operating temperature of the projector 13 (hereinafter referred to as the operating temperature upper limit value) is fixed. ing.
The temperature sensor 41 communicates with a diaphragm (not shown) for opening and closing contacts in the main body S1 of the thermostat S via a capillary tube 42. The main body S1 incorporates the diaphragm, and opens and closes the contact by a snap action using the expansion of the liquid filled in the internal space of the temperature sensor 41 which is a heat sensitive tube. The air cooler 32 operates by opening the contact. In addition, a rotary dial 43 for inputting an operating temperature upper limit value is protruded from the main body S1.

Here, the controller 60 will be described with reference to the block diagrams of FIGS.
As shown in FIG. 1, the projection image changing means 61 is incorporated in the controller 60. The projected image changing means 61 is arranged in the vicinity of the auxiliary material supply port 11 in the steelworks premises, and a first display change switch 62 that is input by a field worker when changing the projected safety sign 12. ˜65, and a second control room 66 that is operated and controlled by the operator of the control room 66 when the projected safety sign 12 is changed. Display change switches 67-70. Only when the first display change switches 62 to 65 and the second display change switches 67 to 70 are inputted simultaneously, the safety sign 12 projected from the projector 13 to the vicinity of the auxiliary material supply port 11 in the factory. Can be changed.

Here, the signs with four safety signs 12 that are to be changed (no entry (1), preparation for acceptance (2), preparation for acceptance (3), acceptance OK (4), etc.) are adopted. . That is, four first display change switches 62 to 65 corresponding to each safety sign 12 are arranged in series on the upper plate 71a of the box on the wall near the auxiliary material supply port 11 in the steelworks. A rectangular first switch box 71 is fixed. Further, the control room 66 has four second display change switches 67 to 70 corresponding to the safety signs 12, and a horizontally long second switch box 72 arranged in series on the upper plate 72a of the box. It is fixed.
At this time, the input operation surfaces of the first display change switches 62 to 65 of the first switch box 71 are always exposed to the outside. In addition, the first switch box 71 has a fan 73 for air-cooling the inside of the box, and the exhaust air after the air-cooling is blown over a zone of the input operation surface of each of the first display change switches 62 to 65. Thus, air cooling / dust removing means 74 for removing dust inside the steelworks attached to each input operation surface is provided. The air cooling / dust removing means 74 includes an exhaust port 75 formed over the entire length of the front side of the upper plate 71a of the first switch box 71, a base end opening communicating with the exhaust port 75, and a front air blower. The outlet 76 has a horizontally long air blowing duct 77 facing each of the first display change switches 62 to 65.
Also, an electric bulletin board 78 is fixed to the site wall for informing the site worker of the safety sign 12 to be changed (after change). The display switching of the electronic bulletin board 78 is performed by key operation of the personal computer P provided in the control room 66. The electric bulletin board 78 and the personal computer P are electrically connected by a wired LAN.

Next, a system of electronic components of the controller 60 will be described with reference to the block diagram of FIG.
The controller 60 has a control unit 79 incorporating a central processing unit (CPU) as a main body. On the input side of the control unit 79, there are a first switch box 71, a second switch box 72, first display change switches 62 to 65 corresponding to a predetermined safety sign 12, and a second display change switch 67. ˜70, a simultaneous input detection circuit 80 for detecting any one of the simultaneous inputs, a storage unit (RAM) 81 in which image data of the four safety signs 12 is stored, and a storage unit 81 Image data corresponding to the first display change switches 62 to 65 and the second display change switches 67 to 70 detected by the simultaneous input detection circuit 80 is selected from each image data, and this is selected by the LAN cable. An image selection circuit 82 that transmits to the projector 13 is electrically connected to each other. On the other hand, the input unit of the projector 13 is electrically connected to the output side of the control unit 79. The second switch box 72 and the controller 60, and the controller 60 and the projector 13 are electrically connected by a wired LAN.
Among these, the control part 79, the simultaneous input detection circuit 80, the memory | storage part 81, and the image selection circuit 82 comprise the projection image change means 61. FIG. However, the control unit 79 and the storage unit 81 are also used for the controller 60.

Next, a method for using the in-factory safety sign projection apparatus 10 according to the first embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, first, the in-factory safety sign projection device 10 is operated to stop the supply of auxiliary materials other than those designated at the floor surface near the auxiliary material supply port 11 arranged in the steelworks premises. A safety sign 12 is projected. As a result, the projection light of the safety sign 12 is irradiated from the lens 17 of the projector 13, and the projection light passes through the tempered glass 14 of the window portion 15 of the dustproof box 16, thereby causing the auxiliary material supply port 11 to be U-shaped. A safety sign 12 "prohibited supply" is projected onto the floor so as to surround the shape.
Therefore, a large amount of dust (slag dust) drifting in the steelworks premises is accumulated in the vicinity of the auxiliary material supply port 11, or the floor surface of the projection location is cracked due to vibrations during traveling of special heavy machinery or large trucks. Even if the shape changes, the safety sign 12 does not break or deteriorate. That is, such a clear safety sign 12 can be always displayed on the auxiliary material supply port 11.

As shown in FIGS. 2 to 5, the projector 13 is housed in the internal space of the dustproof box 16 that is cooled by the air cooler 32. Therefore, for example, not only dust is scattered like this, but even in the premises of an ironworks where the temperature environment is higher than 50 ° C., the projector 13 of the precision machine is not damaged due to high temperature or dust. Can be used.
Furthermore, a vibration isolating member 24 made of a low-hardness urethane gel is interposed between the beam plate 23 and the upper metal fitting 27 of the ceiling hanger 25. Thereby, the vibration generated in the steelworks premises is mitigated by the vibration isolation member 24, and transmission of this vibration to the projector 13 is suppressed. As a result, it is possible to prevent the projector 13 from being damaged due to the vibration.

In particular, since the vibration isolating member 24 made of a low-hardness urethane gel that is softer than hard rubber or the like is adopted as the vibration isolating member, the transmission of vibration generated in the steelworks premises to the projector 13 is suppressed compared to that of hard rubber or the like. It is done.
Further, as described above, when the temperature sensor 41 detects the internal temperature of the dustproof box 16 and the detected temperature value thus obtained exceeds the operating temperature upper limit value of the projector 13, the thermostat S cools the air cooler 32. A start command is issued, and the inside of the dustproof box 16 is cooled. Thereby, the malfunction of the projector 13 caused by the high temperature environment on the premises can be prevented.

Furthermore, since the air cooler 32 is employed as a cooler in this manner, ultra-low temperature air can be injected into the dustproof box 16 without using refrigerant or electricity. As a result, the air cooler 32 can be operated even in places where electricity cannot be used, such as an explosion-proof area. Moreover, since the air cooler 32 is small and light, it can be easily mounted and the installation space can be made compact.
Furthermore, since the compressed air supplied to the air cooler 32 is obtained from the compressor 38 provided in the steelworks premises, a dedicated compressor is not required, and the apparatus cost and running cost can be reduced.
Further, the compressed air from the compressor 38 becomes dry air by passing through the dry filter 39 before being supplied to the air cooler 32. This avoids the problem of the air cooler 32 caused by oil, moisture and fine particles contained in the compressed air, which is a concern when compressed air from the compressor 38 installed in the steel works is directly supplied to the air cooler 32. Can do.

  Further, here, the dust-proof box 16 is a rectangular box, and the projector 13 is suspended from the flat beam plate 23 horizontally mounted on the pair of side plates 16c opposed to the dust-proof box 16, and each of the dust-proof boxes 16 is provided. An air cooler 32 that injects ultra-low temperature air of about −40 ° C. is used as a cooler, and is disposed at the center of the dust-proof box 16 so as to be separated from the wall plate. 23 and the upper plate 16d of the dust-proof box 16 are configured to spray toward the space.

  As a result, it is possible to prevent the freezing failure of the projector 13 when the ultra-low temperature air is directly jetted toward the projector 13. Moreover, the central portion of the dust-proof box 16 is jetted toward the space between the beam plate 23 and the upper plate 16d of the dust-proof box 16 and separated from each wall plate of the dust-proof box 16 in this way. Since the projector 13 is disposed in the rectangular space that has appeared around the projector 13 in the internal space of the dustproof box 16, the ultra-low temperature air is guided by the upper surface of the beam plate 23 and the inner surface of the upper plate 16 d of the dustproof box 16. It can be made to circulate along the shaped flow path. As a result, the projector 13 that generates heat by use can be efficiently cooled from the entire periphery. An anti-vibration member is interposed between at least one of the connected beam plate 23 and the dustproof box and between the connected projector 13 and the beam plate.

Further, the projector 13 having a large weight of about 20 kg is suspended from a beam plate 23 that is horizontally mounted on both side plates 16 c of the dust-proof box 16. At this time, the projector 13 is attached to the beam plate 23 via a thick vibration isolating member 24. Since the vibration isolating member 24 is an elastomer (particularly low hardness), if the environmental load of high temperature and vibration in the steelworks premises acts on these for a long period of time, there is a concern about early deterioration of the vibration isolating member 24. Is done.
If the deterioration of the elastomer occurs, the amount of deformation of the vibration isolating member 24 increases. Therefore, the heavy projector 13 suspended from the beam plate 23 is mounted in the dustproof box 16 by its own weight. Deviation occurs in position. As a result, the projection light emitted from the projector 13 is greatly displaced from the accurate projection position on the floor surface near the auxiliary material supply port 11, and there is a risk that an accident due to this will occur.

  On the other hand, in the case of the first embodiment, the cold air discharge port 33 is configured such that the injection direction of the ultra-low temperature air from the cold air discharge port 33 is the space between the beam plate 23 and the upper plate 16d of the dustproof box 16. It is possible to blow ultra-low temperature air close to the blowing temperature from the vibration isolation member 24. As a result, for example, the vibration isolating member 24 is cooled to a specified temperature as compared to when the air is blown to the vibration isolating member 24 at a downstream position where the cool air is likely to be warmed in the rectangular flow path that appears around the projector 13. Reduce time. Thereby, the influence of the environmental load of the high temperature and vibration in the steelworks premises with respect to the vibration isolation member 24 can be reduced, and the early deterioration of the vibration isolation member 24 can be prevented. Therefore, it is possible to reduce the frequency of occurrence of on-site accidents due to the positional deviation of the projection light from the accurate projection position described above. Such an effect is remarkable when the cold air discharge port 33 of the air cooler 32 (not shown) is directed to the projector 13 (here, the mounting position of the vibration-proof member 24 of elastomer (low hardness urethane gel)) in plan view. It becomes.

Next, a method for changing the projected safety sign 12 will be described with reference to FIGS. 1 and 8.
When the safety sign 12 is changed, first, the operator of the control room 66 operates the key of the personal computer P to select one of the numbers of the first display change switches 62 to 65 corresponding to the safety sign 12 to be changed (after the change). (Here, (1) indicating the first display change switch 62) is displayed on the electronic bulletin board 78 in the field. At this time, the operator presses and holds the corresponding second display change switch 67 (1) in the second switch box 72. An on-site worker looks at the display on the electric bulletin board 78 and presses the corresponding first display change switch 62 in the first switch box 71. Thereby, the first and second display change switches 62 and 67 are simultaneously input. The simultaneous input detection circuit 80 detects that these input conditions are met, and a detection signal is sent to the control unit 79. In response to this, the control unit 79 issues a command to the image selection circuit 82, and the first display change switch 62 and the second display change detected by the simultaneous input detection circuit 82 from the four image data stored in the storage unit 81. The image data corresponding to the display change switch 67 (no entry (1)) is selected. Thereafter, the selected image data is transmitted to the projector 13 via the wired LAN. As a result, the safety sign 12 projected near the auxiliary material supply port 11 in the factory is changed.

  Thus, if the operator who grasps the situation of the site and the operator of the control room 66 located away from the site do not operate at the same time, the safety sign 12 projected near the auxiliary material supply port 11 in the factory. Because the display contents cannot be changed, it is not possible to grasp the on-site situation (such as on-site safety confirmation), and it is possible to grasp the accident that occurs when the operator unilaterally changes the safety sign 12 and the operation status of the factory. Without accident, accidents caused by changing the safety sign 12 without the operator's discretion can be prevented.

  Also, here, of the four first and second display change switches 62 to 65 and 67 to 70, the first and second display change switches 62 corresponding to the safety sign 12 for which entry is prohibited (1). , 67 are configured so that the “supply prohibition” safety sign 12 projected near the auxiliary material supply port 11 in the factory can be changed only when the input operation is performed simultaneously. An interlock mechanism can be incorporated into the change of the safety sign 12 used.

  Furthermore, in the field environment where dust is scattered at high temperature, the electronic components of the first display change switches 62 to 65 are operated by operating the fan 73 of the air cooling / dust removing means 74 in the first switch box 71. Air-cooling can prevent troubles caused by heat from the electronic components. Moreover, the dust adhering to each input operation surface can be removed by spraying the exhaust air after air cooling to a zone of each input operation surface. Thereby, the poor visual recognition of each 1st display change switch 62-65 resulting from adhesion of dust can be eliminated.

  The method of changing each safety sign 12 is not limited to the first embodiment. For example, a contact signal for raising / lowering a safety bar (not shown) when a truck loaded with a secondary material enters near the secondary material supply port 11. And the image data of the safety sign 12 corresponding to the corresponding contact signal is selected from the image data stored in the storage unit 81 by the image selection circuit 82 and transmitted to the projector 13. May be. In addition, for example, the personal computer P arranged in the control room 66 of the ironworks and the on-site controller 60 may be directly electrically connected, and the change of the safety sign 12 may be controlled by a sequencer.

  INDUSTRIAL APPLICABILITY The present invention is useful as a technique for projecting safety signs onto necessary places in a factory in order to ensure the safety of workers.

10 Factory safety sign projector 11 Secondary material supply port (predetermined location)
12 Safety sign 13 Projector 14 Tempered glass (translucent plate)
15 Window 16 Dust-proof box 16a Front plate (wall plate)
16c Side plate (wall plate)
16d Upper plate (wall plate)
16e Rear panel (wall panel)
20 Lid (wall plate)
23 Beam plate 24, 24A Vibration isolation member 32 Air cooler (cooler)
38 Compressor 39 Dry filter 41 Temperature sensor 61 Projected image changing means 62 to 65 First display changing switch 67 to 70 Second display changing switch 71 First switch box 72 Second switch box 74 Air cooling / dust removing means 79 Control unit 80 Simultaneous input detection circuit 81 Storage unit 82 Image selection circuit S Thermostat (cooling control means)

Claims (3)

A projector that projects a safety sign on a predetermined location including the road surface in the factory;
A dust-proof box having a window portion in which the projector is housed and a light-transmitting plate through which projection light from the projector passes is fitted;
A factory safety sign projection apparatus in which the dustproof box is provided with a vibration isolating member for reducing vibration generated in the factory from being transmitted to the projector, and a cooler for cooling the dustproof box. Because
A first display change switch that is provided in the vicinity of a predetermined location in the factory and that is input by a field worker when changing the projected safety sign;
A second display change that is provided in a control room that controls and manages the operation state of the factory at a location remote from the site and that is input by an operator of the control room when the projected safety sign is changed. A switch,
Projection image changing means for changing the safety sign projected from the projector to a predetermined location in the factory only when the first display change switch and the second display change switch are simultaneously input. In-factory safety sign projection device. The number of safety signs is plural, and the display content of each safety sign is different.
In the vicinity of a predetermined location in the factory, a first switch box in which a plurality of the first display change switches corresponding to the respective safety signs are arranged is provided.
The control room is provided with a second switch box in which a plurality of the second display change switches corresponding to the safety signs are arranged,
The projected image changing means includes a simultaneous input detection circuit that detects simultaneous input of the first display change switch and the second display change switch corresponding to the predetermined safety sign, and image data of each safety sign. Corresponding to the first display change switch and the second display change switch detected by the simultaneous input detection circuit from the image data stored in the storage unit. The in-factory safety sign projection according to claim 1, further comprising: an image selection circuit that selects image data and transmits the selected image data to the projector; and a control unit of these electronic devices. apparatus. In the environment where the dust is scattered at a high temperature,
The input operation surface of each first display change switch of the first switch box is always exposed,
The first switch box has a fan for air-cooling the inside of the box, and dust adhering to each input operation surface is removed by blowing exhaust air after air cooling to a zone of each input operation surface. The in-factory safety sign projection apparatus according to claim 2, further comprising air cooling / dust removing means.

Images