JP6134401B1 - Snow accretion prevention device, traffic light snow accretion prevention structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat panel or the like that can be installed on an existing traffic signal and can efficiently prevent snowfall with a simple structure. A pair of transparent plates (3a, 3b) are arranged with a gap and are joined to each other by a joint portion (5). Oil 13 is sealed in the gap 11. The oil 13 is, for example, silicon oil. An electric wire 9 is disposed in the gap 11. The electric wire 9 is disposed so as to meander inside the gap 11. A predetermined range (corresponding to the gap 11) of the heat panel 1 can be uniformly heated by energizing the electric wire 9 with electric power of, for example, about 5 to 10 watts. At this time, the oil 13 is heated by the heat generated in the electric wires 9, and the entire surface of the heat panel 1 can be uniformly heated in a short time by the effect of heat conduction of the oil 13 and the effect of convection of the oil 13. . As a result, the snow adhering to the heat panel 1 can be melted. [Selection] Figure 1

Description

The present invention relates to a snow accretion prevention device and the like for preventing snow accretion to a traffic light or the like, particularly in a snowy country.

  In recent years, heavy snowfall in winter has become a problem with changes in the global environment. Heavy snowfall not only becomes an obstacle to road traffic, but also causes a situation in which the traffic light cannot be seen by blocking the signal color emission by landing on the traffic signal lamp. For this reason, it is desirable to take measures against snow on traffic lights.

  As a countermeasure against such snow accretion, there is a method of providing a hood or a cover that covers the traffic signal (for example, Patent Document 1 and Patent Document 2).

  In addition, there is a method using a heating element (for example, Patent Document 3 and Patent Document 4).

JP 2008-305025 A Japanese Utility Model Publication No. 2009-190554 Utility Model Registration No. 3161877 JP 2012-108861 A

  However, as in Patent Document 1 and Patent Document 2, the method of providing a large hood or the like, even if it is difficult for snow to occur, once the snow arrives, the snow accumulating portion grows and hinders the visibility of the traffic light. It becomes.

  Further, as in Patent Document 3, when infrared rays are used as a heat source, since electric energy is converted into light, the efficiency of conversion and absorption is poor, and in order to obtain a sufficient amount of heat for removing snow on the light emitting surface, There is a difficulty that requires a very large amount of electrical energy.

  Further, Patent Document 4 is provided with a cover to form a dark color portion that absorbs light as a heat source and generates heat. However, inefficiency when light is used for energy transmission means, and such a thing. This hinders the visibility of the traffic light during normal operation.

The present invention has been made in view of such problems, and provides a snow accretion prevention device and the like that can be installed on an existing traffic light and can efficiently prevent snow accretion with a simple structure. For the purpose.

In order to achieve the above-described object, the first invention includes a pair of transparent plates, a liquid sealed in a gap between the pair of transparent plates, and a heat generating wire disposed in the gap and energized. A heat panel, and a drive unit that applies a vertical impact force parallel to the surface of the heat panel to the heat panel, and the drive unit provides a pulse-like impact force to the heat panel. A snow accretion prevention device characterized in that it can be applied.

  Furthermore, it comprises another transparent plate, the other transparent plate is joined to the outer surface of one of the transparent plates with a gap, and a space for heat insulation is provided between the one transparent plate and the other transparent plate. It may be formed.

Thus, the liquid is sealed in the gap formed by the pair of transparent plates, and the electric wire is disposed in the liquid. For this reason, it is possible to prevent snow accretion by transmitting heat generated when energizing the electric wire to the liquid to efficiently heat and melt the snow. Furthermore, since not only heat conduction in the liquid but also convection of the liquid can be used, the entire surface can be heated uniformly. Since conversion and transmission from electrical energy are efficiently performed, it is possible to obtain a snow accretion prevention device that is low in cost, excellent in long-term reliability, and serves as an energy-saving heat source.

  Also, a space for heat insulation is formed on one surface of the heat panel, and the space layer for heat insulation of the heat panel is installed facing the side of the traffic light, the lens of the camera, etc., so that the space layer functions as a heat insulation layer. be able to. For this reason, the heat of a heat panel can be efficiently utilized in front of a heat panel, without letting it escape to the installation target object side. For this reason, it is possible to efficiently prevent snow on the front surface of the heat panel.

The heat panel is disposed on a pedestal, and the driving unit lifts the heat panel from the pedestal from a state where the pedestal and the heat panel are in contact with each other, and drops the heat panel downward to form the pedestal. It is desirable to apply a pulse-like striking force to the heat panel by causing the collision.

  The driving unit may include a motor and a cam structure fixed to the motor, and a pulse-like striking force may be applied to the transparent plate through the cam structure by the rotation of the motor.

  The drive unit includes an electromagnetic coil and a plunger disposed in the electromagnetic coil, and the plunger moves up and down by energization and interruption of the electromagnetic coil, and a pulse-like impact force is applied to the transparent plate. It may be granted.

  In addition, the drive unit includes a hydraulic device and a piston connected to the hydraulic device, and the piston moves up and down by the hydraulic device, and a pulse-like striking force is applied to the transparent plate. Also good.

The heat panel is disposed on a pedestal, and the driving unit lifts the heat panel from the pedestal from a state where the pedestal and the heat panel are in contact with each other, and drops the heat panel downward to form the pedestal. A pulse-like striking force may be applied by causing the collision.
The pulse-like striking force applied by the driving unit may include a plurality of frequency components.
The pair of transparent plates may be joined to each other at a joint, and the joint may be disposed near the edge of the pair of transparent plates, and may be disposed independently of the gap.
The driving unit may be driven every predetermined time.

  In this case, if a pulsed impact force is applied by the motor and the cam structure, the repeated impact force can be efficiently applied with a simple structure.

  Moreover, if a pulse-like striking force is applied by an electromagnetic coil and a plunger, a mechanism without a rotary movable part such as a motor can be obtained.

  Similarly, if a pulse-like striking force is applied by a hydraulic device and a piston, a mechanism without a rotary movable part such as a motor can be obtained.

According to a second aspect of the present invention, there is provided a traffic light snow prevention structure using the snow accretion prevention device according to the first invention, wherein the transparent plate is disposed in front of an indicator lamp of the traffic signal, and the electric wire is energized. It is the traffic signal snow accretion prevention structure characterized by this.

  It is desirable that the electric wire meander in the gap and be arranged in a substantially horizontal direction.

  The drive unit includes an electromagnetic coil and a plunger disposed on the electromagnetic coil, the drive unit is disposed in the vicinity of the upper portion of the heat panel, and the heat plate is used with the upper portion of the heat panel as an action point. It is desirable to give impact to the panel.

According to the second aspect of the present invention, it is possible to suppress snow on the front surface of the indicator lamp of the traffic light.

  In particular, by arranging the electric wires so as to meander in a substantially horizontal direction, the liquid that has received heat from the electric wires can be convected evenly over the entire surface to uniformly heat the surface and melt the snow.

  Moreover, the structure below the heat panel can be simplified by disposing the electromagnetic coil and the plunger above the heat panel and applying a pulse-like striking force to the top of the heat panel. For this reason, a water droplet etc. can be efficiently dropped below.

ADVANTAGE OF THE INVENTION According to this invention, the snow accretion prevention apparatus etc. which can be installed with respect to the existing signal apparatus and can prevent snow accretion efficiently with a simple structure can be provided.

The perspective view which shows the heat panel 1. FIG. The front view which shows the heat panel 1. FIG. (A) is sectional drawing of the heat panel 1, (b) is sectional drawing of the heat panel 1a. The figure which shows the state which attached the heat panel 1 to the security camera 17. FIG. Schematic which shows the snow accretion prevention apparatus 19. FIG. (A), (b) is the schematic which shows operation | movement of the snow accretion prevention apparatus 19. FIG. (A), (b) is schematic which shows operation | movement of the snow accretion prevention apparatus 19a. (A), (b) is schematic which shows operation | movement of the snow accretion prevention apparatus 19b. Schematic which shows the snow accretion prevention structure 37 of a signal apparatus. Schematic which shows the snow accretion prevention structure 37a of a traffic light.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a perspective view showing the heat panel 1, FIG. 2 is a front view showing the heat panel 1, and FIG. 3A is a cross-sectional view taken along line AA of FIG. The heat panel 1 is mainly composed of transparent plates 3a, 3b, electric wires 9, oil 13, and the like.

  The pair of transparent plates 3 a and 3 b are arranged with a gap therebetween and are joined to each other by the joint portion 5. The transparent plates 3a and 3b are resin plates having a thickness of about 2 mm, for example, and a polycarbonate or an acrylic plate can be applied. Since the joint portion 5 is formed at least near the edge of the transparent plates 3a and 3b, a closed space (gap 11) surrounded by the transparent plates 3a and 3b and the joint portion 5 is formed. The thickness of the gap 11 is, for example, about 1 mm.

  In addition, the junction part 5 may be attached so that an edge may be covered from the outer periphery of transparent board 3a, 3b instead of being formed between transparent board 3a, 3b. That is, the joining portion 5 may form a space between the transparent plates 3a and 3b, and the oil 13 to be described later may not leak from the transparent plates 3a and 3b.

  Moreover, you may arrange | position the junction part 5 independently not only in the edge vicinity of transparent board 3a, 3b but in the clearance gap 11. FIG. By doing in this way, it can suppress that the transparent plates 3a and 3b swell with an internal pressure in the clearance gap 11. FIG. Further, for example, a circular gap 11 can be formed by the joint portion 5. In this case, the joint 5 also serves as a spacer that forms the shape of the gap 11. In addition, as the junction part 5, a transparent resin adhesive etc. can be used.

  Oil 13 is sealed in the gap 11. The oil 13 is, for example, silicon oil. The liquid enclosed in the gap may be other than oil as long as it does not freeze in a cold region, does not easily vaporize by heating, and does not corrode the electric wires 9 described later. Moreover, if it will be in a liquid state by the heating by the electric wire 9, it may be a solid or a gel form at low temperature.

  An electric wire 9 is disposed in the gap 11. The electric wire 9 is disposed so as to meander inside the gap 11. The electric wire 9 is a stainless steel wire of about 0.1 mm, for example, and is arranged at an interval of about 15 mm. A part of the heat panel 1 is provided with a terminal portion 7 for energizing the electric wire 9. Instead of the terminal portion 7, the electric wire 9 may be directly drawn out of the heat panel 1.

  A predetermined range (corresponding to the gap 11) of the heat panel 1 can be uniformly heated by energizing the electric wire 9 with electric power of, for example, about 5 to 10 watts. At this time, the oil 13 is heated by the heat generated in the electric wire 9, and the entire surface of the heat panel 1 can be uniformly heated in a short time by the effect of heat conduction of the oil 13 and the effect of convection of the oil 13. . As a result, the snow adhering to the heat panel 1 can be melted.

  In addition, as shown in FIG.3 (b), you may join the other transparent plate 3c, leaving a clearance gap with the outer surface of one transparent plate 3b. For example, the vicinity of the edge of the transparent plate 3b and the transparent plate 3c is joined to form a heat insulating space 15 having a shape corresponding to the gap 11. By doing in this way, the space 15 for heat insulation can be formed between the transparent plate 3b and the transparent plate 3c. That is, the heat insulation space 15 is a closed space surrounded by the transparent plates 3 b and 3 c and the joint portion 5.

  The heat panel 1 may use the transparent plate 3a side as a front surface, and can also use the transparent plate 3b side as a front surface. On the other hand, the heat panel 1a uses the surface on the transparent plate 3a side (the side opposite to the side on which the heat insulation space 15 is formed) as a front surface, and the transparent plate 3c on which the heat insulation space 15 is formed is installed. Contact or face the subject.

  The heat insulation space 15 functions as a heat insulation layer. For this reason, when the transparent plates 3 a and 3 b are heated by the oil 13, it is difficult for heat to escape from the transparent plate 3 b side. As a result, the transparent plate 3a can be efficiently heated. For this reason, it is possible to efficiently melt the snow on the front surface of the heat panel 1a and suppress the snow accumulation.

  FIG. 4 is a diagram illustrating a state in which the heat panel 1 (or 1a) is applied to the security camera 17. The heat panel 1 is attached to the lens surface of the security camera 17. A control unit 18 is connected to the heat panel 1. The control unit 18 is a temperature control device for the heat panel 1. That is, the control unit 18 monitors the temperature of the heat panel 1 and prevents the heat panel 1 from being overheated. That is, energization is stopped when the temperature exceeds a predetermined value. Further, for example, when the temperature of the heat panel 1 becomes a predetermined temperature or less, it can be controlled to start energization.

  As described above, when the heat panel 1a is used, the transparent plate 3a may be disposed on the front surface, and the transparent plate 3c may be disposed on the lens surface of the security camera 17.

  Here, when installing the heat panels 1 and 1a, it is desirable that the electric wires 9 meander and be arranged in a substantially horizontal direction. When the electric wire 9 is disposed in the vertical direction, the oil 13 around the electric wire 9 is warmed and convects upward, but it takes time until the oil 13 between the electric wires 9 becomes uniform. On the other hand, if the electric wire 9 is disposed substantially horizontally, the oil 13 warmed by the electric wire 9 convects upward in a linear shape, and the temperature can be made uniform in a shorter time.

  As described above, according to the present embodiment, in a cold region, the heat panel 1, 1a is applied to a device whose function is degraded by snowfall, such as the security camera 17, for example, so that the front surface of the heat panel is contacted. It can melt snow and weaken adhesion. For this reason, snow accretion to an apparatus etc. can be controlled. For this reason, the function fall by snow accretion can be prevented.

  At this time, since all members except the electric wire 9 are non-colored transparent members, the influence on an image of a camera or the like is small. Moreover, since the electric wire 9 is sufficiently thin, the visual field is not hindered.

  Further, by providing the heat insulation space 15 with the transparent plate 3c, it is possible to suppress the heat generated from the electric wires 9 from being diffused wastefully. For this reason, heat can be efficiently utilized on the front surface of the heat panel 1a. For this reason, it contributes to energy saving performance.

  Next, a second embodiment will be described. FIG. 5 is a diagram illustrating the snow accretion prevention device 19. In addition, although the following description demonstrates the example using the heat panel 1, you may use the heat panel 1a.

  The snow accretion prevention device 19 mainly includes a heat panel 1, a control unit 18, a drive unit 29, and the like. Note that the frame and the like that support the heat panel 1 are not shown. A pedestal 23 is provided at the bottom of the heat panel 1. The heat panel 1 is arrange | positioned on the base 23, and the lower end of the base 23 and the heat panel 1 contacts.

  In addition, a drive unit 29 that applies a vertical striking force to the heat panel 1 is disposed below the heat panel 1. The drive unit 29 includes a motor 25 and a cam structure 27. The cam structure 27 is fixed to the rotating shaft of the motor 25. The cam structure 27 is formed with a protrusion in the radial direction at least partially. The drive unit 29 is a part that applies a pulse-like striking force to the heat panel 1. The heat panel 1 can be slid up and down by the guide 21. Further, the drive unit 29 may be arranged at a plurality of locations.

  FIG. 6 is a diagram illustrating the operation of the snow accretion prevention device 19. When the motor 25 is operated, as shown in FIG. 6A, the cam structure 27 rotates (arrow B in the figure), and the heat panel 1 rides on the protrusion of the cam structure 27, so that the heat panel 1 moves upward. It is lifted (arrow C in the figure). That is, the heat panel 1 is lifted from the pedestal 23. At this time, the heat panel 1 moves upward while maintaining the posture by the guide 21. The structure of the guide 21 is not limited to the illustrated example.

  When the motor 25 further rotates, as shown in FIG. 6B, the protrusion of the cam structure 27 passes through the heat panel 1 and the heat panel 1 falls downward (arrow D in the figure). At this time, the heat panel 1 collides with the pedestal 23 (E in the figure). Therefore, a pulse-like impact is applied to the heat panel 1.

  For example, the control unit 18 detects the temperature of the heat panel 1 (for example, the front surface temperature), and stops the energization of the electric wire 9 and the driving of the driving unit 29 when the temperature is equal to or higher than a predetermined value. Moreover, the control part 18 starts the energization to the electric wire 9, and the drive of the drive part 29, when the temperature of the heat panel 1 is below predetermined. At this time, on / off of energization to the electric wire 9 and on / off of the drive unit 29 may be controlled based on different standards. For example, the drive unit 29 may be driven every predetermined time. Thus, the control unit 18 can perform appropriate temperature control.

  Here, the water droplets heated and melted by the heat panel 1 maintain the state of adhering to the front surface of the heat panel 1 because the frictional force with the front surface of the heat panel 1 is greater than the gravity. In contrast, by applying an external force to the heat panel 1, an external force is also applied to the water droplets. When the external force (acceleration) applied to the water droplet becomes larger than the frictional force, the water droplet starts to move by falling due to gravity. Once the water droplet starts to move, the dynamic friction is smaller than the static friction, so that the water droplet easily falls.

  Here, the magnitude of the external force applied to the water droplet is considered. If the water droplets periodically move due to the external force, the amplitude of the external force is large, and the force acting on the water droplet can be increased when the frequency is large. In particular, since the effect of applying force to water droplets acts on the square of the frequency, it is desirable to apply external force at a high frequency.

  However, realizing a high amplitude at a high frequency is limited in terms of structure, energy consumption, and cost. Therefore, in order to apply an external force at a high frequency, the amplitude must be small.

  On the other hand, in the present invention, not a single frequency motion but a pulse-like impact is used. For example, in the present embodiment, it can be approximated as a triangular pulse wave. When such a pulse wave is Fourier expanded, it is decomposed into many frequency components. That is, when a pulse-like impact force is applied to a water droplet, an external force with an extremely high frequency component, which is difficult to obtain by single frequency motion, can be applied to the water droplet.

  For example, if the pulse width (time) is a triangular wave of 1/100 second, a strong force is distributed in the range of 0 to 200 Hz. This is difficult to obtain with a single frequency motion, and as described above, a force acts on the water droplet by the square of the frequency, so that the effect of dropping off the water droplet can be improved. That is, the pulse-like striking force in the present invention is obtained by applying a pulse-like motion including a plurality of frequency components, not a single frequency motion.

  In the above-described embodiment, when the heat panel 1 is lifted from the pedestal 23 and dropped and then collided with the pedestal 23, the dropping motion of the heat panel 1 stops abruptly. At this time, the heat panel 1 is given a pulse-like striking force, and water droplets can be dropped efficiently. In addition, by repeatedly applying a pulse-like striking force at a predetermined interval, a striking force can be continuously imparted to water droplets on the entire surface of the heat panel 1.

  In addition, the snow accretion prevention effect was confirmed using the heat panel 1 actually covered with snow. Silicone oil was sealed in the gap 11 having a thickness of 1 mm, and 0.1 mmφ stainless steel wires were meandered at intervals of 15 mm. In addition, as mentioned above, the electric wire 9 was meandered so that it might be arrange | positioned in a horizontal direction. When electric power of 7 watts was applied to the electric wire 9 and the operation of lifting and dropping the heat panel 1 by 1.5 mm was applied about 10 times per second, the snow that had snowed could be removed.

  As described above, according to the second embodiment, water droplets melted by the heat panel 1 can be reliably dropped. At this time, compared to a case where the heat panel 1 is simply vibrated (single-frequency motion), it is possible to effectively drop water droplets with small energy.

  Next, a third embodiment will be described. FIG. 7 is a diagram illustrating the operation of the snow accretion prevention device 19a. In addition, in the following description, about the structure which show | plays the same function as the snow accretion prevention apparatus 19, the code | symbol same as FIGS. 1-6 is attached | subjected, and the overlapping description is abbreviate | omitted.

  The snow accretion prevention device 19a has substantially the same configuration as the snow accretion prevention device 19, but the structure of the drive unit 29 is different. As for the snow accretion prevention apparatus 19a, the drive part 29 consists of the base 23, the plunger 31, the electromagnetic coil 33 grade | etc.,.

  When the electromagnetic coil 33 is energized, a force is applied to the plunger 31 disposed inside the electromagnetic coil 33. For this reason, the plunger 31 can be protruded from the electromagnetic coil 33. When the plunger 31 is protruded upward (arrow F in the figure), the heat panel 1 can be lifted upward by the plunger 31 (arrow G in the figure). That is, the heat panel 1 is lifted from the pedestal 23. At this time, the heat panel 1 moves upward while maintaining the posture by the guide 21.

  Next, when the energization to the electromagnetic coil 33 is stopped, as shown in FIG. 7B, the plunger 31 returns to the inside of the electromagnetic coil 33 (arrow H in the figure), and the heat panel 1 falls downward (FIG. Middle arrow I). At this time, the heat panel 1 collides with the base 23 (J in the figure). Therefore, a pulse-like impact is applied to the heat panel 1.

  As described above, according to the third embodiment, the same effects as those of the second embodiment can be obtained. Further, since the plunger 31 is moved up and down by energizing and shutting off the electromagnetic coil 33 and a pulse-like striking force is applied to the heat panel 1, there is no need for a rotating mechanism-like operating part such as a motor.

  Note that a hydraulic device and a piston may be used as a drive unit that does not have an operation unit like a rotating mechanism such as a motor. That is, the piston may be moved up and down by a hydraulic device to apply a pulse-like striking force to the transparent plate.

  Next, a fourth embodiment will be described. FIG. 8 is a diagram illustrating the operation of the snow accretion prevention device 19b. The snow accretion prevention device 19b has substantially the same configuration as the snow accretion prevention device 19a and the like, but the arrangement of the drive unit 29 is different.

  In the snow accretion prevention devices 19 and 19a described above, an example in which the drive unit 29 is disposed below the heat panel 1 and the cam structure 27 or the plunger 31 is brought into contact with the lower end of the heat panel 1 is shown. On the other hand, in the snow accretion prevention device 19b, the drive unit 29 is disposed above the heat panel 1.

  In the present embodiment, an arm portion 35 is provided on the upper portion of the heat panel 1. At normal times, the arm portion 35 and the pedestal 23 are in contact with each other. Note that the arm portion 35 may be protruded to the rear side or the front side instead of protruding in the width direction of the heat panel 1 as illustrated.

  As shown in FIG. 8A, when the electromagnetic coil 33 is energized, the plunger 31 can be protruded from the electromagnetic coil 33. The heat panel 1 can be lifted upward (arrow L in the figure) by projecting the plunger 31 upward and pushing up the arm portion 35 (arrow K in the figure). That is, the arm portion 35 of the heat panel 1 is lifted from the pedestal 23.

  Next, when the energization of the electromagnetic coil 33 is stopped, as shown in FIG. 8B, the plunger 31 returns to the inside of the electromagnetic coil 33 (arrow M in the figure), and the heat panel 1 falls downward (FIG. Middle arrow N). At this time, the heat panel 1 collides with the pedestal 23 (O in the figure). Therefore, a pulse-like impact is applied to the heat panel 1.

  As described above, according to the fourth embodiment, an effect similar to that of the third embodiment can be obtained. Moreover, since the drive part 29 is arrange | positioned above the heat panel 1, the drive part 29 grade | etc., Is not provided under the snow accretion prevention apparatus 19b. That is, the drive part 29 is arrange | positioned in the upper part vicinity of the heat panel 1, and gives the striking force to the heat panel 1 by making the upper part of the heat panel 1 into an action point. For this reason, the structure below the heat panel 1 can be simplified, and water drops can be efficiently dropped downward.

  Next, a usage example of the snow accretion prevention device will be described. FIG. 9 is a view showing the snow accretion prevention structure 37 of the traffic light. A snow accretion prevention device 19 is installed in front of each indicator light of the traffic light 39. As described above, the electric wire 9 is arranged to meander. At this time, the electric wire 9 is disposed substantially horizontally. By doing in this way, the whole surface of the heat panel 1 is heated substantially uniformly.

  Further, by melting the snow that comes into contact with the heat panel 1 and applying a pulse-like striking force by the drive unit 29, the snow and water droplets can be reliably dropped downward.

  When the traffic light 39 has three lights arranged in the vertical direction as in the traffic light snowfall prevention structure 37a shown in FIG. 10, the three heat panels 1 may be integrally configured. In this case, a pulse-like impact may be applied to the entire heat panel 1 with a single drive unit 29.

  In addition, you may apply the snow accretion prevention apparatus 19a, 19b with respect to the signal apparatus 39. FIG. Further, when the heat panel 1 is integrally formed, a structure in which the electric wires 9 are continuous may be employed.

  According to the snow-prevention structures 37 and 37a for traffic signals, it is possible to efficiently prevent snow from reaching the traffic lights 39.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

1, 1a ......... heat panels 3a, 3b, 3c ......... transparent plate 5 ......... joining part 7 ......... terminal part 9 ......... wire 11 ......... gap 13 ......... oil 15 ......... heat insulation Space 17 ... Security camera 18 ... Control units 19, 19a, 19b ... Snow prevention device 21 ... Guide 23 ... Base 25 ... Motor 27 ... Cam structure 29 ... ... Driver 31 ......... Plunger 33 ......... Electromagnetic coil 35 ......... Arms 37, 37a ......... Snow-prevention structure 39 for traffic light ......... Signal machine

Claims (12)

A pair of transparent plates;
A liquid sealed in a gap between the pair of transparent plates;
A heating wire disposed in the gap and energized;
A heat panel comprising :
A drive unit for applying a vertical impact force parallel to the surface of the heat panel to the heat panel;
The snow accumulating device according to claim 1, wherein the driving unit is capable of applying a pulse-like striking force to the heat panel. Furthermore, it comprises another transparent plate, the other transparent plate is joined to the outer surface of one of the transparent plates with a gap, and a space for heat insulation is provided between the one transparent plate and the other transparent plate. The snow accretion prevention device according to claim 1, wherein the device is formed. The heat panel is disposed on a pedestal;
The drive unit is
From the state where the pedestal and the heat panel are in contact, the heat panel is lifted from the pedestal,
3. The snow accretion prevention device according to claim 1, wherein a pulse-like impact is applied to the heat panel by dropping the heat panel downward and causing the heat panel to collide with the pedestal. The drive unit includes a motor and a cam structure fixed to the motor,
The snow accretion prevention device according to claim 3, wherein a pulse-like impact force is applied to the transparent plate through the cam structure by the rotation of the motor. The drive unit includes an electromagnetic coil and a plunger disposed in the electromagnetic coil,
The snow accretion prevention device according to claim 3, wherein the plunger moves up and down by energization and interruption of the electromagnetic coil, and a pulse-like impact force is applied to the transparent plate. The drive unit includes a hydraulic device and a piston connected to the hydraulic device,
The snow accretion prevention device according to claim 3, wherein the piston moves up and down by the hydraulic device, and a pulse-like striking force is applied to the transparent plate. 2. The snow accretion prevention device according to claim 1, wherein the pulse-like impact applied by the drive unit includes a plurality of frequency components. The pair of transparent plates are joined to each other at a joint portion,
8. The snow accretion prevention device according to claim 1, wherein the joint portion is disposed in the vicinity of an edge portion of the pair of transparent plates, and is further disposed independently in the gap. . The snow accretion prevention device according to any one of claims 1 to 8, wherein the driving unit is driven every predetermined time. A snowfall prevention structure for a traffic light using the snowfall prevention device according to any one of claims 1 to 9 ,
A traffic light snow accretion prevention structure, wherein the transparent plate is disposed in front of an indicator lamp of the traffic signal, and the electric wire is energized. The traffic light snow accretion prevention structure according to claim 10 , wherein the electric wires meander in the gap and are arranged in a substantially horizontal direction. The drive unit includes an electromagnetic coil and a plunger disposed on the electromagnetic coil, the drive unit is disposed in the vicinity of the upper portion of the heat panel, and the heat plate is used with the upper portion of the heat panel as an action point. The traffic light snow accretion prevention structure according to claim 10 or 11 , wherein a striking force is applied to the panel.

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