JPS6346494Y2 - - Google Patents

Description

[Detailed description of the invention] (Technical field) This invention is a road surface heating heater that heats the road surface to soften the asphalt before stripping the asphalt from the road surface, making it easier to perform stripping work. The present invention relates to a height adjustment device for maintaining an optimal height position.

(Background of the idea) When resurfacing damaged asphalt pavement, the old asphalt must first be peeled off. As asphalt softens at high temperatures, heating the road surface prior to stripping will make the work easier. For this reason, various types of road surface heaters have been used in the past. As an example of such a heater for road surface heating, the present inventor has proposed Utility Model Application No. 57-031355 (Utility Model Application No. 62
A brief explanation of the road surface heating heater (No.-9365) will be given below. The road surface heating heater according to the invention is
A plurality of heater elements 1 as shown in FIGS. 1 and 2 and two exhaust elements 2 as shown in FIGS. 3 and 4 are combined as shown in FIG. , 1 is ignited, high-temperature combustion gas flows in the direction of the arrow in FIG. 5 and is exhausted from the exhaust pipes 4, 4 on the upper surfaces of the left and right exhaust elements 2, 2. Skirts 5, 5 are attached to the lower sides of both the front and rear ends of each heater element 1, 1 (both left and right ends in Figure 1), and a large number of chains 6 are suspended from the lower edge of the outer end of the exhaust elements 2, 2. Therefore, cold air does not flow between the lower surface of the road surface heating heater 7 and the road surface, and the road surface is efficiently heated by the radiant heat from the combustion cylinder 8 heated by the burner 3 and the heat from the exhaust gas. heated.

However, both the previously devised road surface heater configured and operated in this way, and other types of road surface heaters, do not work well unless the distance between the bottom surface of the heater and the road surface is at an appropriate height. Road surface heating cannot be increased. That is, if the above-mentioned distance is too large, the heat of the heater will not be sufficiently transmitted to the road surface, and the chain 6 and skirt 5
floats up from the road surface and the surrounding air enters the underside of the heater to create a cooling effect, resulting in insufficient softening of the asphalt.On the other hand, if the distance is too small, the asphalt surface will become too heated, causing carbonization or combustion. Gas discharge is obstructed, causing poor combustion,
Alternatively, the lower surface of the heater may collide with the iron cover of the manhole and be damaged. The road surface has unevenness, and the wheels of the work vehicle ride on or sink into the unevenness, causing the distance to change frequently. Therefore, if the heater is left suspended from the work vehicle, uneven heating will occur. In order to perform easy and uniform heating, the height of the heating heater must be adjusted frequently.

(Purpose of the present invention) In view of the above-mentioned circumstances, the present invention is capable of automatically adjusting the height of the heating heater according to the road surface condition, and the road surface can be efficiently and evenly heated by the road surface heater. The object of the present invention is to provide a height adjustment device for a road surface heating heater that can heat the road surface.

(Structure of the present invention) The height adjustment device for a road surface heating heater of the present invention has the following features:
A heating heater is suspended from the underside of the work trolley using multiple hydraulic cylinders, and the distance between the underside of the heater and the road surface is measured at multiple locations of the heating heater, and if this distance is outside the optimal range, A switch device is provided to send a signal to a solenoid valve, and the solenoid valve sends pressure oil to the hydraulic cylinder based on the signal, so that the hydraulic cylinder raises or lowers a part of the road surface heating heater by a predetermined amount. It is composed of

(Embodiments of the present invention) Next, the present invention will be explained in more detail while explaining the illustrated embodiments.

FIG. 6 shows a state in which the road surface heating heater 7 is suspended from the lower surface of the truck 8 of the working vehicle by hydraulic cylinders 9a to 9c (9a is in the shadow of 9b). Three hydraulic cylinders 9a to 9c are used for one road surface heating heater 7, and as shown in FIG.
Three points x placed on the isosceles triangle at the center of the top surface,
This road surface heating heater 7 is suspended at y and z.

FIG. 7 shows an example of a switch device 10 that detects the distance between the lower surface of the heater and the road surface and sends a signal to the solenoid valves connected to the hydraulic cylinders 9a, 9b, and 9c when this distance is out of the optimum range. ing.
This switch device 10 includes a rod 12 which is vertically slidably engaged with a case 11 fixed to a heater 7.
A pincushion-shaped abutment piece 13 designated as 3b is fixed.
A pin 14 protruding from the side surface of the lower end of the rod 12 protruding from the lower surface of the case 11 is loosely engaged with a long hole 17 bored at the upper end of the swinging arm 16 which is pivotally connected to the bracket 15 on the lower surface of the case 11. are doing. Swing arm 1
A sled-shaped sliding contact plate 18 is pivotally supported at the lower end of 6. This sliding contact plate 18 slides on the road surface as the trolley 8 moves, and when the distance between the road surface and the lower surface of the heater 7 becomes smaller, it moves in the direction of arrow a and moves through the swinging arm 16 and pin 14. lower the rod 12,
When the distance increases, the rod 12 is moved in the direction of arrow b and raised. A changeover switch 19 is provided in the case 11, and a roller 21 pivotally attached to the tip of a changeover arm 20 of the changeover switch 19 faces the side surface of the abutment piece 13. The changeover switch 19 closes separate contacts when the swing arm 16 swings upward or downward, and the hydraulic cylinder 9
Any of the solenoid valves 22a to 22c that feed pressure oil to the upper or lower part of the cylinder chambers a, 9b, and 9c.
(Fig. 9), and as shown in Fig. 8, it is installed at points A, B, C, and D at the four corners of the heater 7, and the road surface and the bottom surface of the heater are connected to each other at each point. If the distance deviates from the optimum range, pressure oil is supplied to the desired hydraulic cylinder, and the heater 7 is raised or lowered so that the distance becomes the optimum value.

Next, the effect of maintaining the distance between the lower surface of the road surface heating heater 7 and the road surface within the optimum range by such a height adjustment device will be explained with reference to FIG. 9 in addition to FIGS. 6 to 8.

(a) In all points A to D, the distance between the road surface and the bottom surface of the heater is within the optimal height range (for example, 75±25
m/m).

In this case, none of the rollers 21 attached to each switch device 10 come into contact with the large diameter portion of the abutment piece, the switch device 10 does not close any of its contacts, and the solenoid valves 22a to 22c are not energized. First, since pressure oil is not supplied to or discharged from the hydraulic cylinder, the heater 7 is maintained as it is.

(b) When the height distance between the road surface and the bottom surface of the heater becomes too small at point A.

In this case, the lower sliding contact plate 18 of the switch device 10 provided at point A moves in the direction of arrow a in FIG.
0 is pulled downward, contacts 23a and 23b
(Fig. 9) are electrically connected. As a result, the solenoid valve 22a is energized for a predetermined time via the relay 24, which is turned on for a predetermined time by the timer 25.
This solenoid valve 22a is connected to the hydraulic cylinder 9 at point x.
A predetermined amount of pressure oil is supplied to the lower part of the cylinder chamber a. As a result, the road surface heating heater 7 is pulled up by the hydraulic cylinder 9a at point x, and the area at point a is raised by a predetermined amount (for example, about 25 m/m. This amount can be easily changed by adjusting the energization time by the timer 25. )Rise.

(c) When the height distance between the road surface and the bottom surface of the heater becomes too large (high) at point A.

In this case, the sliding contact plate 18 moves in the direction of arrow b, pushing the switching arm 20 upwards, and switching the switching arm 20 upward.
The contacts 23a and 23c of the hydraulic cylinder 9a are electrically connected, a predetermined amount of pressure oil is supplied to the upper part of the cylinder chamber of the hydraulic cylinder 9a, and the portion A of the road surface heating heater is lowered by a predetermined amount.

(d) When the distance between the road surface and the bottom surface of the heater deviates from the optimum range at point ro.

In this case, the switch device 10 installed at the point
Due to the action of the hydraulic cylinder 9b installed at point y
Supply pressure oil to the upper or lower part of the cylinder chamber,
Lower or raise the point RO portion of the heater 7 by a predetermined amount.

(e) When the height distance between the road surface and the bottom surface of the heater becomes too small (low) at point C.

In this case, the switch device 10 provided at point C
The sliding contact plate 18 moves in the direction of arrow a, and the contact 26a of the changeover switch 19 changes to 26b and 27a.
is electrically connected to 27b, and contact 28a is electrically connected to 28b. As a result, the electromagnetic valves 22b and 22c are energized for a predetermined period of time, and a predetermined amount of pressure oil is supplied to the lower portions of the cylinder chambers of the hydraulic cylinder 9b at point y and the hydraulic cylinder 9c at point z, and both hydraulic cylinders 9b , 9c, the road surface heating heater 7
is raised at points y and z, and the part C of this heater 7 is raised by a predetermined amount. At this time, if the point RO portion rises too much and the distance between the road surface and the lower surface of the heater at the point RO portion deviates from the optimum range, the operation in case (d) described above is performed.

(f) When the height distance between the road surface and the bottom surface of the heater becomes too large (high) at point C.

In this case, the sliding contact plate 18 moves in the direction of arrow b, and the contact 26a of the changeover switch 19 changes to 26c.
, contact 27a is 27c, contact 28a is 28
c and are electrically connected to the hydraulic cylinders 9b and 9c, respectively.
Pressure oil is supplied to the upper part of the cylinder chamber, and the point C of the road surface heating heater is lowered by a predetermined amount. At this time, if the distance between the road surface and the lower surface of the heater at point 0 becomes too small (low), the operation in case (d) above is performed.

(g) When the height distance between the road surface and the bottom surface of the heater deviates from the optimum range at point D.

In this case, the switch device 10 provided at point D
By this function, pressure oil is supplied to the upper or lower part of the cylinder chambers of the hydraulic cylinders 9a and 9c provided at both points x and z, and the portion at point d is lowered or raised by a predetermined amount.

The height adjustment device for the road surface heating heater of the illustrated embodiment operates to maintain the distance between the lower surface of the heater and the road surface within the optimum range based on the movements (a) to (g) above, but the adjustment is difficult. The time required is less than 1 second, and if another point is out of range due to adjustment of a certain point, that point is also immediately corrected. Since the moving speed of a working vehicle with a suspended road surface heating heater is approximately several meters per minute during heating work, adjusting the height of the heater in this manner can provide a sufficient practical effect.

In the illustrated embodiment, the three hydraulic cylinders are arranged in an isosceles triangle to suspend the heater from the underside of the workbench, but instead of arranging them in this way, Two hydraulic cylinders may be arranged at intervals on the center line of the upper surface of the heater 7, and the heater 7 may also be able to rotate slightly in the swinging direction with respect to the center line.

(Effects of the present invention) Since the height adjustment device for a road surface heating heater of the present invention is configured and operates as described above, the height distance between the bottom surface of the heater and the road surface can always be maintained within the optimum range. The road surface can be heated efficiently, and the asphalt surface can be prevented from becoming charred or the lower surface of the heater can be prevented from being damaged.

[Brief explanation of the drawing]

1 to 5 show an example of the road surface heating heater according to the previous invention, in which FIG. 1 is a longitudinal cross-sectional side view of the heater element, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG. is a side view of the exhaust element, Figure 4 is a sectional view taken along line B-B in Figure 3, Figure 5 is a schematic longitudinal sectional view of the assembled heater, and Figure 6 is a diagram of the heater suspended from a work vehicle. 7 is a side view of the switch device, FIG. 8 is a plan view of the heater showing the arrangement of the switch device and hydraulic cylinder, FIG. 9 is a circuit diagram of the height adjustment device, and FIG. 10 is a diagram of the heater. It is a schematic perspective view which shows another example of a suspension system. 1: Heater element, 2: Exhaust element, 3: Burner,
4: Exhaust pipe, 5: Skirt, 6: Chain, 7: Road surface heating heater, 8: Trolley, 9a, 9b, 9c: Hydraulic cylinder, 10: Switch device, 11: Case,
12: Rod, 13: Collision piece, 13a, 13b:
Large diameter part, 14: pin, 15: bracket, 16:
Swinging arm, 17: Long hole, 18: Sliding plate, 19: Switching switch, 20: Switching arm, 21: Roller, 22a
~c: Solenoid valve, 23a~c: Contact, 24: Relay, 25: Timer, 26a~c, 27a~c, 2
8a-c: Contact points.

Claims (1)

[Scope of utility model registration request] Road surface heating heaters are suspended from the underside of the trolley under road surface heating work using multiple hydraulic cylinders, and signals are sent to multiple locations of the heating heaters only when the distance between the underside of the heater and the road surface deviates from the optimal range. A switch device is provided, and the plurality of hydraulic cylinders move the road surface heating heater based on the signal from the switch device so that the distance between the lower surface of the heater and the road surface is within the optimum range. Heater height adjustment device.