JPH11139489A - Tank lorry for asphalt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To peel an asphalt solid adhered to an inner wall surface of a tank by transmitting the driving force of a motor to a rotary shaft through a pulley, and turning a wiper along an inner wall of a tank. SOLUTION: A rod-like wiper 11 is arranged parallel to the longitudinal direction of a tank 3 close to an inner wall of a tank on an upper part inside the tank 3. An arm 12 integrated with a wiper 11 is mounted on a rotary shaft 14 which is turnably supported by a splash-proof plate 13 mounted in the transverse direction of the tank 3. A forward end of the rotary shaft 14 supported by a bearing 14a of the splash-proof plate 13 is projected from the bearing 14a of a forward end plate of the tank 3, and connected to a drive shaft of a motor 16 through a pulley 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of asphalt tank trucks for heating and storing liquid asphalt in a tank and transporting the asphalt, and in particular, removes asphalt solids adhered to the inner wall above the tank by scraping. It relates to the wiper to be performed.

[0002]

2. Description of the Related Art A conventional asphalt tank lorry is provided with a hot air pipe in a tank so as to prevent hardening of asphalt stored in a tank mounted on an automobile.
It is necessary to heat from about 00 ° C. to about 250 ° C. and transport in a liquid state. There is a space above the tank in which the liquid asphalt is stored, and the inner wall of the tank is cooled to near room temperature by the outside air because the hot asphalt does not directly contact. For this reason, the evaporated portion of the liquid asphalt and the asphalt scattered from the liquid surface during transportation adhere to the cooled tank inner wall and solidify, and gradually become a thick and layered asphalt solid. This asphalt solid does not dissolve even if it falls off the tank inner wall and falls into the liquid asphalt, it becomes a foreign substance in the asphalt or closes the supply / drain port, so for example, every six months, a cleaning worker hatches inside the tank. And it was necessary to remove asphalt solid matter from the tank inner wall by hand.

[0003]

However, the work of cleaning the inner wall of the tank of the asphalt tank lorry requires wearing protective clothing because the closed tank is filled with vaporized components such as asphalt and a strong cleaning agent. Had to be done, and in the summer it was hard work with high temperatures. Also, in order to take the dropped asphalt solids out of the tank, they must be packed in a bag and taken out of the hatch, or the asphalt solids must be shredded and suctioned together with a cleaning agent by a vacuum device. Did not. Therefore, development of an apparatus capable of removing asphalt solids stuck to the inner wall surface of the tank without putting a cleaning worker in the tank has been awaited.

[0004]

According to a first aspect of the present invention, there is provided an asphalt tank lorry for storing and transporting liquid asphalt in a tank. It is provided with a drivable wiper for asphalt solids sticking to the inner wall surface. As a result, the liquid asphalt adheres to the upper inner wall surface of the tank, and the solidified asphalt that has cooled and solidified can be scraped off by the wiper. Then, the asphalt solid matter at the previous stage, which forms a large and thick layer, dissolves in the dropped liquid asphalt. Here, the wiper that scrapes the asphalt solids rubs against the asphalt solids and does not contact the tank inner wall, so that the tank inner wall is not damaged, and the wiper tip is hardly worn and does not need to be replaced frequently. In addition, the shape of the wiper, the direction in which the wiper is attached to the longitudinal direction of the tank, and the direction of movement thereof are as follows. First, a linear or rod-shaped wiper is positioned parallel to the longitudinal direction of the tank. In the case where the wiper is rotated in a direction orthogonal to the direction, and secondly, an arc-shaped or elliptical outer peripheral wiper along a tank cross section orthogonal to the longitudinal direction of the tank is positioned so as to be orthogonal to the longitudinal direction of the tank. In the longitudinal direction of the tank. Among them, in the first case of rotating the linear or rod-shaped wiper, a plurality of rotation axes are arranged in parallel to the longitudinal direction of the elliptical tank, or, for example, one rotation axis is Corresponds to tanks of various shapes by movably providing the rotation axis itself, such as expanding the rotation trajectory from a circle to a rectangle with a semicircle on both sides by moving left and right in the direction perpendicular to the longitudinal direction Then, the wiper can slide. Since the reinforcing plate provided inside the tank protrudes inward, the wiper does not move that part, so there is a leftover part,
It is possible to attach two short wipers with their phases shifted in the direction of rotation, or to add an extended portion corresponding to the shape to a straight or rod-shaped wiper in order to grip the arc-shaped portion at the front and rear ends of the tank. Liquid asphalt cools and solidifies if not heated, so a heating exhaust pipe is required in the tank.However, tank lorries dedicated to short-distance transportation have increased insulation or heat insulation such as thickening the tank wall. If it can be transported while maintaining a high temperature and a liquefied state, it is not necessary to equip the tank with an exhaust pipe for heating.

[0005] In particular, in a tank truck for asphalt which stores, heats and transports liquid asphalt in a tank mounted on an automobile, a wiper for scraping asphalt solids sticking to the inner wall surface of the tank, and a wiper for collecting asphalt solids inside the tank. A bearing attached to the built-in wavebreak plate, rotatably supporting the arm of the wiper, and a drive motor coupled to a drive shaft supported by the bearing,
The asphalt tank lorry according to claim 2, wherein the tank has a circular cross-sectional shape, the drive shaft of the wiper is located above the center of the tank, and the interval between the tank and the wiper becomes wider from above to below. . Thus, in addition to the effect of the first aspect, asphalt solids on the liquid surface are large, and above that, volatile components are fixed and correspond to thin asphalt solids. The wave-breaking plate to which the rotating shaft is attached may not only be laid in the horizontal direction, but also be installed in the tank in the vertical direction as long as it can supply and discharge liquid asphalt and prevent rapid movement of the liquid. In addition, the cross-sectional shape in a direction perpendicular to the longitudinal direction of the tank can wipe the inner wall of the tank above the liquid level where the liquid asphalt is maximally stored, if at least the upper part is formed in a circular or arcuate shape. Since the lower part of the tank is in contact with the liquid asphalt, solidification and melting are repeated, and the sectional shape is not limited. However, even if the cross-sectional shape of the tank is horizontally long and elliptical, by attaching the wiper to the center of the ellipse without positioning the rotation axis of the wiper upward, the distance between the wiper and the inner wall of the tank can be reduced. The left and right sides of the tank can be wider than above. Further, even if the cross section of the tank is another elliptical arc shape, a wiper may be used as long as the mechanism can control the rotation axis itself in two orthogonal directions perpendicular to the longitudinal direction of the tank and move in a curved shape. And the distance between the tank and the inner wall of the tank can be freely controlled.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. Drawing 1 is an explanatory view showing the inside of a tank seen from the side of a tank truck for asphalt. Reference numeral 1 denotes an asphalt tank lorry vehicle having a tank 2 mounted on its carrier 2 and a cover 3 on the outside for heat insulation.
Coated with 1. Above the inside of the tank 3, a rod-shaped wiper 11 is arranged in parallel with the longitudinal direction of the tank 3 and close to the tank inner wall. An arm 12 integrated with the wiper 11 is provided with a wave-proof plate 13
It is attached to a rotation shaft 14 that is rotatably supported by the camera. Rotating shaft 14 supported by bearing 14a of wavebreak plate 13
Is projected from a bearing 14a of a front end plate 3a of the tank 3 and connected to a drive shaft of a motor 16 via a pulley 15. As a result, the driving force of the motor 16 is transmitted to the rotating shaft 14 via the pulley 15 and the wiper 1
Since 1 is rotated along the inner wall of the tank, asphalt solids stuck to the inner wall of the tank 3 can be scraped.

A hot air pipe 21 is provided below the inside of the tank 3 in the front-rear direction. A rear end 21a of the hot air pipe 21 is opened at a lower part of a rear end plate 3b of the tank 3 so as to be connected to a heater 22 provided at the rear end of the loading platform. Connected. The front end 21 b of the hot air tube 21 opens above the front end plate of the tank 3 and discharges hot air from the heater 22. In addition to a hot air supply system including a hot air pipe 21 and a burner 22, a pump 23 is provided near the hot air pipe 21 through which the hot air from the hot air pipe 21 is transmitted, and the pump 23 supplies and discharges liquid asphalt to the outside of the tank. Therefore, a take-out pipe 24 is connected, and a handle 25 for operating the discharge / suction switching valve of the pump 23 is attached above the tank 3.
Since the hot air pipe 21 and the take-out pipe 24 are shown in a simplified manner, they can be widely arranged below the tank in consideration of the thermal efficiency and the suction effect. Further, since the take-out pipe 24 and the hatch 26 are provided at the rear of the tank, the wiper 11 is not installed, but the take-out pipe 24 is projected from below the tank, and the lower end of the hatch 26 is mounted flush so as not to project to the tank inner wall. This allows the wiper 11 to wipe the entire tank inner wall up to the rear of the tank.

FIG. 2 is an explanatory view showing the tank cross section taken along the line AA of FIG. 1 omitting the cover 31 and the like. The cross section of the tank 3 in a direction perpendicular to the longitudinal direction is circular. ing. , The tip 11a of the wiper 11 has a section V
Even if the asphalt solids pulverized in the V-shaped groove of the tip 11a accumulate, the wiper 11 turns and tilts left and right as shown by the two-dot chain line. The crushed material slides down from the inclined groove end. Wiper 1
1 is attached to the center C of the tank 3
Since the tank 3 and the wiper 11 are located higher by the height H, the interval between the tank 3 and the wiper 11 is wider toward the lower interval L2 than the upper interval L1. The asphalt solids on the inner wall of the tank close to the liquid level S indicated by a two-dot chain line are not always rotated at the time of loading, but are changed to the loading time and the frequency thereof once a month. Forms a large, thick layer above which volatiles stick and the asphalt solids are thin.
However, it is possible to cope with the fact that the rotational power for rubbing the asphalt solid is almost the same, and it is possible to efficiently scrape the asphalt solid. Further, for example, when the wiper is in contact with the inner wall of the tank, the wiper can be prevented from being buried in the asphalt solid and unable to rotate. In addition, the wave preventing plate 13 to which the rotating shaft is attached is not only laid in the lateral direction, but also
The wave preventing plate 13 may be attached in the vertical direction as long as it can supply and discharge liquid asphalt and prevent rapid movement of liquid. Further, if the shape of the tank 3 is not circular but is an elliptical shape having a horizontal length, the rotating shaft 14 of the wiper 11 can be attached to the center of the elliptical shape. Thereby, the gap between the wiper 11 and the inner wall of the tank 3 can be wider in the left-right direction than above the tank 3.

FIG. 3 is a wiring diagram of a controller 17 for controlling a motor 16 for rotating the wiper 11 of FIG. 1, and FIG. 4 is an explanatory diagram showing a time chart thereof. When the interlocked reset switch SW1 is operated by the operation of the engine key (arrow A in FIG. 4), the relay R11 is operated and the basic operation of the wiper is started. The basic operation of the wiper is
By operation of the relay R11, two contact points R12, R1
3 is closed and the contact R12 holds the relay R11 even when the reset switch SW1 is turned off. Further, the relay R31 having a large capacity is operated by the contact R13, the contact 32 is closed, and the motor M is rotated in one direction. When the limit switch LS2 disposed at one end of the rotated wiper range is closed, the holding state of the relay R11 is released and the motor M is stopped, while the relay R21 is operated and the two contacts R22 and R23 are closed, Relay R21 is held by contact R22. When the relay R41 having a large capacity is operated by the contact R23, the motor M is rotated in the other direction, and the limit switch LS1 disposed at the other end of the wipe range is closed, the holding state of the relay R21 is released, and the relay 41 is released. Is released, the motor M stops, and the basic operation of the wiper indicated by the two-dot chain line in FIG. 4 ends.
At this time, the switch SW has been released and the relay R11
Does not operate, and the wiper stops with the side on which the limit switch LS1 is disposed as an initial state. When the operation switch is turned ON (arrow B in FIG. 4), the closed limit switch LS is closed.
1 activates the relay R11 and starts the basic operation of the wiper. If the switch SW is closed when the basic operation of the wiper is completed, the relay R11 is operated and the basic operation of the wiper is continued again. On the other hand, when the switch SW is released during the basic operation of the wiper (arrow C in FIG. 4), the relays R11 and R12 are connected to the contacts R12 and R12.
Since the wiper is held by R22, the wiper does not stop immediately, and when the basic operation of the wiper ends, the switch S
If W is not closed and is in the off state, the relay R
11 does not operate, the next basic operation of the wiper is not executed, and the wiper stops.

Next, another embodiment will be described. In FIG. 1, since the wiper 11 is attached to the existing tank 3, a short wiper 11 between the reinforcement frames in the tank longitudinal direction is used in order to avoid a reinforcement frame attached in a circumferential direction inside the tank.
The wiper 11 is not extended to the rear of the tank 3 in order to avoid the asphalt take-out pipe 24 and the hatch 26 at the rear of the tank. Change or hatch 2
6, the inside of the tank 3 is smoothed by removing the portion protruding inside the tank 3 by polishing or changing the arrangement of the hatch 26 and the take-out pipe 24 below the tank 3. 11 can be extended to the rear of the tank 3. In addition, when the hatch 26 and the take-out pipe 24 are arranged at the upper end of the tank 3, as shown in FIG. On the other hand, by arranging the two wipers 11c on the left and right, the solids on both sides can be scraped without rotating the wiper 11c to the upper end of the tank. Further, when the rotation range of the right and left wipers 11c shown in FIG. 5 is wide, a total of three wipers of the center and left and right are attached,
The central wiper can be omitted and the left and right wipers can be attached only at the position where the hatch and the inlet / outlet pipe are arranged at the upper end of the tank. The state where the wiper is attached to the rotating shaft is, when viewed from the longitudinal direction of the tank, a case where the wiper is arranged in a straight line as shown in FIG. 2 or a vertical line passing through the rotating shaft 14 as shown in FIG. To be symmetrical with respect to
By arranging the wipers 11 alternately on the left and right sides with respect to the rotation axis and arranging the ends of the front and rear wipers 11 to overlap as shown in FIG. May be effective. FIG.
The heights of the wipers 11 provided alternately from the rotation axis are displayed differently for a sense of perspective, but the lengths from the rotation axis are the same. Further, since the front and rear ends of the tank are the end plates 3b and 3a formed in a spherical shape, the wiper is formed not in a straight line in the longitudinal direction but in an arc shape along the spherical surface like a wiper 11d shown in FIG. Asphalt solids can be scraped to the front and rear ends of the tank. Note that the arm 12 needs to be branched and connected for reinforcement of strength.
Also, at the position shown in FIG. 1 where the front end 21b of the hot air tube 21 is attached, the hot air tube 21 comes into contact with the rotating wiper 11d,
As shown in FIG. 6, the front end 21b needs to be attached to the tank 3 below the wiper 11d.

[0011]

As described above, according to the first aspect of the present invention, asphalt solids stuck to the inner wall surface of the tank can be removed without putting a cleaning worker in the tank. In addition to eliminating the need for harsh work involving high temperatures in the summer as well as the filling of vaporized components of asphalt, the asphalt solids that are dropped dissolve into the raw material asphalt. The troublesome industrial waste was also eliminated.
According to the invention of claim 2, in addition to the above-described effects, the gap between the upper part of the tank and the wiper is narrowed, so that asphalt solids near the liquid surface are large, and the volatile matter is fixed above the asphalt solids. Corresponding to thin asphalt solids, solids can be scraped efficiently.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view in the longitudinal direction of an asphalt tank truck according to the present invention.

FIG. 2 is an end view taken along line AA of FIG.

FIG. 3 is a wiring diagram for controlling a wiper.

FIG. 4 is an explanatory diagram showing a time chart of FIG. 3;

FIG. 5 is an end view in a longitudinal section orthogonal to a tank longitudinal direction, showing another embodiment.

FIG. 6 is a longitudinal sectional view in a tank longitudinal direction showing another embodiment.

[Description of Signs] 1 .... Tank lorry for asphalt, 2 .... Packing bed, 3
..Tank, 3a..front end plate, 11, 11b, 11
c, 11d · · · wiper, 11a · · · tip, 12 · · ·
Arm, 13 ・ ・ Wave breaker, 14 ・ ・ Rotating shaft, 14a ・ ・
Bearing, 15 ・ ・ Pulley, 16 ・ ・ Motor, 21 ・
・ Hot air pipe, 21a ・ ・ Rear end, 21b ・ ・ Front end, 22
..Heater, 23 .. pump, 24 .. take-out tube, 2
5. Handle, 26 hatch, 31 cover.

Claims (2)

[Claims] An asphalt tank lorry for heating and storing liquid asphalt in a tank, and a transporter for driving the asphalt solids stuck to the inner wall surface of the tanker in the tank. Asphalt tank truck. 2. An asphalt tank lorry for heating, storing and transporting liquid asphalt in a tank mounted on an automobile, comprising: a wiper for scraping asphalt solids stuck to an inner wall surface of the tank; A bearing mounted on the mounted wavebreak plate and rotatably supporting the arm of the wiper; and a drive motor connected to a drive shaft supported by the bearing, wherein the cross-sectional shape of the tank is circular. The drive shaft of the wiper is located above the center of the tank, and the distance between the tank and the wiper is widened from above to below.