JP5684094B2 - Emulsion tank pipe heating system - Google Patents

Description

  The present invention relates to a pipe-type heating device for an emulsion tank, and more particularly to a pipe-type heating device for an emulsion tank mounted on an asphalt finisher (paving machine) or the like.

  In general, when road paving is performed by an asphalt finisher, an asphalt emulsion is sprayed on a construction surface by an emulsion spraying device. In this way, by spreading the asphalt emulsion on the construction surface, it is possible to provide an adhesive force between the asphalt mixture and the construction surface, and also to form a waterproof layer.

  An asphalt finisher equipped with such an emulsion spraying device, a so-called tuck paver, is widely used in pavement construction. In pavement work using this tuck paver, asphalt emulsion is sprayed on the construction surface by an emulsion spraying device provided at the rear of the machine body, and an asphalt mixture is supplied thereon, and this is spread by screed and leveled.

  By the way, the asphalt emulsion needs to be heated at an appropriate temperature in order to improve fluidity and prevent deterioration. As a conventional emulsion tank heating device, the warm water chamber of the jacket attached to the outer peripheral surface of the lower half of the emulsion tank is made to flow while being filled with warm water heated by heating means disposed in the hot water circulation pipe. Is known to heat the asphalt emulsion in the emulsion tank (see, for example, Patent Document 1).

  As another conventional technique, a jacket is attached to the lower outer peripheral surface of the emulsion tank, and a space between the opposing surfaces of the emulsion tank and the jacket is formed in the hot oil reservoir, and is attached to the outer bottom surface of the jacket. There is also known a technique in which hot oil in a hot oil reservoir is heated by a heating means such as an electric heater and the asphalt emulsion in an emulsion tank is heated by this hot oil (see, for example, Patent Document 2).

JP 2008-285852 A JP 2004-100145 A

  However, the prior art described in Patent Document 1 is configured to heat the emulsion tank by introducing the warm water into the warm water chamber in the jacket attached to the outer peripheral surface of the lower half of the emulsion tank. The portion along the outer peripheral surface of the lower half is heated intensively, making it difficult to heat the asphalt emulsion in the inner central portion of the emulsion tank, and the temperature difference between the lower outer peripheral portion and the inner central portion of the emulsion tank. Asphalt emulsion cannot be heated uniformly.

  Moreover, in the structure of the jacket heating system, the inner peripheral side heat radiation area of the jacket is smaller than the outer peripheral side heating area of the jacket mounted on the lower half of the emulsion tank, so that the required outer peripheral heat radiation area is secured. The jacket itself must be formed large.

As a result, the emulsion tank also becomes larger as the jacket diameter increases, so that the weight of the entire emulsion tank increases.

  Further, in the prior art described in Patent Document 2, since the heat source for heating the asphalt emulsion in the emulsion tank is an electric heater, in addition to the electric heater, a generator drive is used in order to secure a power source of the electric heater. This requires a hydraulic motor, a generator, a control panel, etc., resulting in high costs.

  Therefore, there is a technical problem to be solved in order to be able to heat the entire asphalt emulsion including the lowest bottom in the emulsion tank uniformly and efficiently without using an electric heating device. The present invention aims to solve this problem.

The present invention has been proposed in order to achieve the above object, and the invention according to claim 1 is a pipe-type heating device for an emulsion tank in which an asphalt emulsion is stored. The hot oil pipe is piped along the longitudinal direction of the emulsion tank while being bent in the vertical direction and the horizontal direction, and the inner center portion in the emulsion tank is radiated by heat radiation from the hot oil pipe. And the entire asphalt emulsion including the vicinity of the outer peripheral inner surface can be heated evenly , the emulsion tank has an inclined portion on the bottom, and a bottom bottom hot oil pipe is disposed at the bottom of the emulsion tank, The hot oil pipe is connected to the bottom bottom hot oil pipe so that the asphalt emulsion stored in the bottom bottom of the emulsion tank can be heated by heat radiation from the bottom bottom hot oil pipe. Providing a pipe heating apparatus emulsion tank, characterized in that the configuration was.

According to this configuration, by introducing the hot oil into the hot oil pipe piped in the emulsion tank, the heat radiation from the hot oil pipe uniformly heats the region reaching the inner central portion of the emulsion tank and the vicinity of the outer peripheral inner surface. Is done. Moreover, the hot oil introduced into the hot oil pipe flows through the hot oil pipe and is then introduced into the lower bottom hot oil pipe. Therefore, the lowest bottom asphalt emulsion in the emulsion tank is also heated by heat radiation from the bottom bottom hot oil pipe.

The invention according to claim 2 is configured such that the thermal oil is provided with thermal energy by driving an actuator that operates a mechanism element of the asphalt finisher. A heating device is provided.

According to this configuration, the thermal oil is given thermal energy by driving an actuator that operates a mechanism element of the asphalt finisher, and heats the asphalt emulsion in the emulsion tank by heat radiation from the hot oil pipe through which the hot oil flows. To do.

The invention according to claim 3 is a pipe-type heating device for an emulsion tank in which an asphalt emulsion is stored, wherein a hot oil pipe through which hot oil flows is provided in the emulsion tank, and the hot oil pipe is arranged in a vertical direction. In addition, the entire asphalt emulsion including the inner central portion of the emulsion tank and the vicinity of the inner peripheral surface of the emulsion tank can be heated evenly by being radiated from the hot oil pipe while being bent in the left-right direction. configured, the hot oil provides a pipe heating apparatus Emulsion tank you characterized by being configured so that the heat energy is applied by the driving of the actuator for actuating the mechanical elements of an asphalt finisher.

  According to this configuration, the thermal oil is given thermal energy by driving an actuator that operates a mechanism element of the asphalt finisher, and heats the asphalt emulsion in the emulsion tank by heat radiation from the hot oil pipe through which the hot oil flows. To do.

  According to the first aspect of the present invention, the region reaching the inner central portion of the emulsion tank and the vicinity of the outer peripheral inner surface is uniformly heated by the heat radiation from the hot oil pipe, so that the asphalt emulsion in the inner central portion of the emulsion tank is also Can be heated as efficiently as the asphalt emulsion near the inner surface of the outer periphery, and in addition, the temperature difference between the lower outer periphery and the inner center of the emulsion tank is eliminated, and all the asphalt emulsion in the emulsion tank is uniform and effective. Can be heated.

Further, by adopting a hot oil pipe heating method, the asphalt emulsion directly contacts the outer peripheral surface of the hot oil pipe. As a result, the hot oil pipe heating method of the present invention has a larger contact heating area (heat transfer area) to the asphalt emulsion than the jacket heating method, and accordingly, the emulsion tank can be made smaller and the emulsion The weight of the tank can be reduced. Furthermore, since the asphalt emulsion at the bottom bottom in the emulsion tank can be heated by heat radiation from the hot oil pipe for the bottom bottom, the storage amount of the asphalt emulsion is reduced and remains only at the bottom bottom in the emulsion tank. Even when heating by the hot oil pipe becomes difficult, the asphalt emulsion remaining at the bottom of the emulsion tank can be stably heated.

According to the invention described in claim 2, since the thermal oil is given thermal energy by driving various actuators of the asphalt finisher, an electric heating device is used in addition to the effect of the invention described in claim 1. Therefore, the asphalt emulsion can be heated without the need for a hydraulic motor for driving a generator for securing a power source for the electric heater.

According to the invention of claim 3, wherein the thermal oil, the thermal energy is applied by the drive of the various actuators asphalt finisher, without the use of electrical heating devices, it is possible to heat the asphalt emulsion Therefore, a hydraulic motor for driving a generator for securing the power source of the electric heater is not necessary.

The side view of the asphalt finisher provided with the emulsion spraying apparatus applied to the Example of this invention. Explanatory drawing which shows the hydraulic circuit applied to the pipe-type heating apparatus of the emulsion tank which concerns on the Example of this invention. The front view which shows the pipe-type heating apparatus of the emulsion tank which concerns on the Example of this invention. FIG. 4 is a left side view of FIG. 3. FIG. 4 is a right side view of FIG. 3. FIG. 4 is a plan view of FIG. 3. AA line sectional view of Drawing 3. BB sectional drawing of FIG. The front view which shows the pipe-type heating apparatus which does not arrange | position the bottom bottom hot oil pipe in the lower bottom part of an emulsion tank. The left view of FIG. The right view of FIG. The top view of FIG. FIG. 10 is a cross-sectional view taken along line AA in FIG. 9. BB sectional drawing of FIG.

The present invention stores an asphalt emulsion in order to achieve the purpose of heating the entire asphalt emulsion including the lower bottom in the emulsion tank uniformly and quickly with high efficiency without using an electric heating device. A pipe-type heating device for an emulsion tank, wherein a hot oil pipe through which hot oil flows is provided in the emulsion tank, and the hot oil pipe is bent in the vertical direction and the horizontal direction in the longitudinal direction of the emulsion tank. The entire asphalt emulsion including the inner central portion of the emulsion tank and the vicinity of the inner peripheral surface of the emulsion tank can be heated evenly by heat radiation from the hot oil pipe, and the emulsion tank has an inclined portion on the bottom surface. The bottom bottom hot oil pipe is disposed at the bottom bottom of the emulsion tank, and the bottom bottom hot oil pipe is connected to the bottom bottom hot oil pipe. The heat radiation from, was achieved by having the structure can be heated asphalt emulsion stored in the lowest bottom of the said emulsion tank.

  A preferred embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a side view of an asphalt finisher (hereinafter referred to as “tack paver”) equipped with an emulsion spraying apparatus according to this embodiment.

  A tack paver 10 shown in FIG. 1 includes, in a self-propelled traveling vehicle 1, a hopper 2 that contains an asphalt mixture, a delivery device 3 that delivers the asphalt mixture in the hopper 2 onto a construction surface, and the delivery device 3. A pair of spray bars 4A and 4B for spraying asphalt emulsion provided on the front side of the spreading screw 3b, a pair of screeds 5A and 5B provided on the rear side of the spreading screw 3b, and an emulsion for storing the asphalt emulsion. And a tank 6.

  While the asphalt emulsion stored in the emulsion tank 6 is sprayed on the work surface 7 by the spray bars 4A and 4B, the asphalt mixture from the hopper 2 is sent out onto the asphalt emulsion by the delivery device 3. Then, the asphalt mixture is spread and leveled by the screeds 5A and 5B.

  Further, the delivery device 3 travels the bar feeder 3a for sending the asphalt mixture in the hopper 2 to the rear of the traveling vehicle 1, and the asphalt mixture that has been sent backward by the bar feeder 3a and dropped onto the construction surface 7. The spreading screw 3b extends in the width direction of the vehicle 1 (direction perpendicular to the paper surface in FIG. 1).

  The left and right pairs of the spray bars 4A and 4B and the screeds 5A and 5B are supported by the traveling vehicle 1 while being shifted in parallel in the front and rear directions of the traveling vehicle 1, and the width direction of the traveling vehicle 1 is The spread width of the asphalt emulsion and the spread width of the asphalt mixture can be adjusted.

  Next, FIG. 2 shows a configuration example of a hydraulic circuit applied to the pipe type heating device of the present embodiment. This heating device supplies high-temperature hydraulic oil (hot oil) circulating through the various actuators of the tack pavers 10 to the pipes in the emulsion tank 6 without using a power supply device, and the thermal energy of the hydraulic oil is supplied to the emulsion tank 6. The asphalt emulsion is heated to a desired temperature by heat exchange with the asphalt emulsion.

  In FIG. 2, the hydraulic oil 11 a in the hydraulic oil tank 11 rises to a predetermined hydraulic pressure at a predetermined flow rate by a hydraulic pump 13 driven by the engine 12, passes through a hydraulic circuit 14, and various mechanical parts of the tack paver 10 are It is supplied to the actuator 15 to be driven.

  The hydraulic oil 11a is heated by the driving energy of the actuator 15 and rises in temperature. In particular, when the actuator 15 is relieved, the hydraulic oil 11 a passes through the relief valve 16.

  At this time, the temperature of the hydraulic oil 11a rapidly rises due to the hydraulic energy of the high-pressure hydraulic oil 11a passing through the relief valve 16. This high temperature of the hydraulic oil 11a can be used to warm the asphalt emulsion 19 in the emulsion tank 6, particularly before the start of the paving operation. Further, during the pavement work, the temperature of the hydraulic oil 11a rises to some extent by the drive energy of the actuator 15, so that this oil temperature can be used effectively.

  The hydraulic oil 11a that has passed through the actuator 15 or the relief valve 16 is switched in the oil path of the first three-way switching valve 18 under the control of the controller 17, and the hot oil pipe 30 and the like disposed in the emulsion tank 6 (lower Including the bottom hot oil tank 33) or the bypass oil passage 21.

  Then, the hydraulic oil 11 a that has passed through the hot oil pipe 30 or the like or the bypass oil passage 21 is switched via the bypass oil passage 24 by switching the oil passage of the second three-way switching valve 22 under the control of the controller 17. It is returned directly to the tank 11 or passes through an oil cooler 23 cooled by the rotation of the fan 12a, cooled to a predetermined oil temperature, and then returned to the hydraulic oil tank 11.

A first temperature sensor 25 that measures the temperature of the asphalt emulsion 19 and transmits the temperature information to the controller 17 is provided in the emulsion tank 6. Further, a second temperature sensor 26 that measures the temperature of the hydraulic oil 11 a and transmits the temperature information to the controller 17 is provided in the hydraulic oil tank 11.

  With the above configuration, when the asphalt emulsion 19 is heated from room temperature to the target temperature, the hydraulic oil 11a that drives the actuator 15 is relieved by the relief valve 16, and the hydraulic oil 11a that has become high temperature is thereby released from the relief valve 16 side. This is sent to the first three-way switching valve 18.

  Next, under the control of the controller 17, the first three-way switching valve 18 is switched to the oil passage side of the hot oil pipe 30, and the high temperature hydraulic oil 11 a is sent to the hot oil pipe 30. As a result, the heat energy of the hot hydraulic oil 11a in the hot oil pipe 30 is heat exchanged with the asphalt emulsion 19 in the emulsion tank 6, and the asphalt emulsion 19 is heated to a target temperature.

  Next, when the asphalt emulsion 19 in the emulsion tank 6 reaches the target temperature, based on the temperature information from the first temperature sensor 25, the controller 17 switches the first three-way switching valve 18 to operate the hydraulic oil. 11a is switched to the bypass oil passage 21, but at this time, the hydraulic oil 11a does not exchange heat with the asphalt emulsion 19.

  When the oil temperature of the hydraulic oil 11a in the hydraulic oil tank 11 becomes equal to or higher than a predetermined temperature, the second three-way switching valve 22 is set to oil according to a command from the controller 17 based on the temperature information of the second temperature sensor 26. Switch to the cooler 23 side. As a result, the hydraulic oil 11 a passes through the oil cooler 23 and is cooled and returned to the hydraulic oil tank 11.

  Next, when the asphalt emulsion 19 in the emulsion tank 6 is at a low temperature below a predetermined value, the controller 17 sets the first three-way switching valve 18 to the hot oil pipe 30 based on the temperature information from the first temperature sensor 25. The high-temperature hydraulic oil 11a is sent to the hot oil pipe 30. For this reason, the asphalt emulsion 19 in the emulsion tank 6 is heated by the heat exchange action of the high temperature hydraulic oil 11a in the hot oil pipe 30.

  As shown in FIGS. 4 and 5, the emulsion tank 6 has an inclined surface 6 a at the bottom thereof, and the high-temperature working oil (hereinafter referred to as “hot oil”) 11 a flows into the emulsion tank 6. A hot oil pipe 30 is provided. The hot oil pipe 30 has a hot oil inlet portion 31 on one end side in the longitudinal direction (left and right direction L in FIG. 3) of the emulsion tank 6, and the hot oil inlet portion 31 is disposed on the upper end portion on one end side of the emulsion tank 6. Has been.

  The hot oil inlet portion 31 of the hot oil pipe 30 is connected to the first three-way switching valve 18 shown in FIG. Further, the hot oil pipe 30 has a hot oil outlet portion 32 on the other end side in the longitudinal direction L of the emulsion tank 6, and the hot oil outlet portion 32 is disposed on the front surface on the other end side of the emulsion tank 6.

  The intermediate portion of the hot oil pipe 30 is formed so as to be bent many times in the vertical and horizontal directions so as to uniformly heat the asphalt emulsion 19 in the emulsion tank 6. That is, the intermediate portion of the hot oil pipe 30 has a three-dimensional shape in which a number of inverted U-shaped portions are connected to each other in the longitudinal direction L of the emulsion tank 6 in the front view shown in FIG. In the plan view shown in FIG. 3, a three-dimensional shape in which a large number of U-shaped portions symmetrical to each other are connected to each other in the longitudinal direction L of the emulsion tank 6 is exhibited.

Further, the intermediate portion of the hot oil pipe 30 has a three-dimensional shape in which a number of U-shaped portions are connected to each other in the longitudinal direction L of the emulsion tank 6 in a side view shown in FIG. Therefore, the intermediate portion of the hot oil pipe 30 is sufficiently close to the inner central portion and the outer peripheral inner surface in the emulsion tank 6.
Along the substantially entire area of the emulsion tank 6 in the longitudinal direction L, the emulsion tank 6 is repeatedly inverted in the vertical and horizontal directions. Therefore, the asphalt emulsion 19 in the emulsion tank 6 can be heated evenly by heat radiation from the hot oil 11a flowing in the hot oil pipe 30.

  Further, the hot oil outlet portion 32 of the hot oil pipe 30 is connected to a hot oil inlet portion 34 of a hot oil pipe 33 for a lower bottom portion having a square cross section via a connecting pipe (not shown). The hot oil 11a can be introduced into the lower bottom hot oil pipe 33 from the hot oil outlet 32. The hot oil inlet portion 34 of the lower bottom hot oil pipe 33 is disposed at the lowermost front portion on one end side in the longitudinal direction L of the emulsion tank 6. Further, the hot oil outlet portion 35 of the lower bottom hot oil pipe 33 is disposed at the lowermost front portion on the other end side in the longitudinal direction L of the emulsion tank 6, and the hot oil outlet portion 35 is shown in FIG. A second three-way switching valve 22 is connected.

  An intermediate portion of the bottom bottom hot oil pipe 33 is provided along the longitudinal direction L of the bottom bottom portion of the emulsion tank 6. Therefore, even the asphalt emulsion 19 remaining in a small amount at the bottom bottom in the emulsion tank 6 can be heated with high heat efficiency by heat radiation from the hot oil 11a flowing in the bottom bottom hot oil pipe 33. It is configured.

  Incidentally, as shown in FIGS. 9 to 14, the pipe-type heating device having a structure in which the bottom bottom hot oil pipe is not provided at the bottom bottom of the emulsion tank 6 has the following problems. That is, the emulsion tank 6 is formed so that the lower bottom portion of the emulsion tank 6 is inclined downward toward the suction port 36 so that the asphalt emulsion 19 can be used up even if the residual amount of the asphalt emulsion 19 is reduced. Yes. Therefore, when the hot oil pipe 30 having a three-dimensionally bent shape is provided in the emulsion tank 6, the lower bottom portion of the emulsion tank 6 is provided because the bent shape portion and the return shape portion formed in the hot oil pipe 30 are provided. The hot oil pipe 30 cannot be disposed to the side.

  As a result, when the residual amount of the asphalt emulsion 19 is reduced, the lower end portion of the hot oil pipe 30 protrudes from the liquid surface of the asphalt emulsion 19, and the asphalt emulsion 19 is released by heat radiation from the hot oil pipe 30. Can not be heated. In addition, since the lower bottom side of the emulsion tank 6 cannot be heated by heat radiation from the hot oil pipe 30, the emulsion temperature on the upper side in the emulsion tank 6 and the emulsion tank 6 even when the asphalt emulsion 19 is full. The difference from the emulsion temperature on the lower side becomes large, and the entire asphalt emulsion 19 in the emulsion tank 6 cannot be heated uniformly.

  In that respect, in the present invention, since the bottom bottom hot oil pipe 33 is disposed at the bottom of the emulsion tank 6, the asphalt emulsion 19 remaining at the bottom of the emulsion tank 6 can be heated.

  Further, when the asphalt emulsion 19 is full, the asphalt emulsion 19 in the emulsion tank 6 is set so that there is no difference between the emulsion temperature on the upper side of the emulsion tank 6 and the emulsion temperature on the lower side of the emulsion tank 6. Can be warmed uniformly.

  As described above, according to the present invention, the hot oil pipe 30 through which the hot oil 11a flows is provided in the emulsion tank 6, and the hot oil pipe 30 is piped so as to bend in the emulsion tank 6 vertically and horizontally. Since the asphalt emulsion 19 in the emulsion tank 6 is heated by heat radiation from the pipe 30, the asphalt emulsion 19 is combined with the fact that the entire outer peripheral surface of the hot oil pipe 30 is in surface contact with the asphalt emulsion 19. It is possible to heat uniformly and rapidly to a desired temperature with high efficiency.

  Further, since the hot oil outlet portion 32 of the hot oil pipe 30 through which the hot oil 11a flows is connected to the lower bottom portion hot oil pipe 33 disposed along the lowermost bottom portion of the emulsion tank 6, The lowermost bottom part in the emulsion tank 6 can be reliably heated by the heat radiation from the lower bottom part hot oil pipe 33. Therefore, even if the residual amount of the asphalt emulsion 19 decreases, the asphalt emulsion 19 remaining in the lowermost part of the emulsion tank 6 can be efficiently heated by the heat radiation from the lower bottom hot oil pipe 33.

  Further, since the lower bottom side of the emulsion tank 6 can be warmed by heat radiation from the bottom bottom hot oil pipe 33, when the asphalt emulsion 19 is full, the emulsion temperature on the upper side of the emulsion tank 6 and the emulsion tank 6 is eliminated from the emulsion temperature on the lower side, and the entire asphalt emulsion 19 in the emulsion tank 6 can be uniformly warmed.

  Further, according to the present invention, the asphalt emulsion 19 is heated with the heat energy increased in temperature by the hydraulic oil 11a of the machine working device in the tack pavers 10. Therefore, an electrical heating device such as a generator or an electric heater is not required at all, and the components of the emulsion heating device in the tack paper 10 are simplified and the cost is reduced.

  Further, during the pavement work, the heat energy of the hot oil 11a that has been raised by the drive energy of the actuator 15 is heat-exchanged to the asphalt emulsion 19, so that the heat energy of the tack pavers 10 can be effectively used to improve the overall energy efficiency. Can be raised.

  Furthermore, since the asphalt emulsion 19 is in direct contact with the outer peripheral surface of the hot oil pipe 30 according to the present invention, the contact heating area for the asphalt emulsion 19 is greatly increased as compared with the jacket heating method. Therefore, the contact heating area with respect to the asphalt emulsion 19 increases, and the emulsion tank 6 can be reduced in size and weight accordingly.

  While specific embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. Of course, the invention extends to such modifications.

  For example, if necessary, the hot oil pipe 30 and the lower bottom hot oil pipe 33 can be connected in parallel to each other so that the flow rates of the hot oil can be controlled independently of each other.

  The emulsion heating apparatus of the present invention uses an asphalt emulsion as well as a tuck paver as long as a hot oil pipe is provided in the emulsion tank and the asphalt emulsion in the emulsion tank is heated by hot oil flowing through the hot oil pipe. The present invention can be used for all mechanical devices.

5A, 5B Screed 6 Emulsion tank 10 Tack paver (asphalt finisher)
11 Hydraulic oil tank 11a Hydraulic oil (hot oil)
DESCRIPTION OF SYMBOLS 13 Hydraulic pump 14 Hydraulic circuit 15 Actuator 16 Relief valve 17 Controller 18 First three-way switching valve 19 Asphalt emulsion 22 Second three-way switching valve 30 Hot oil pipe 31 Hot oil inlet part 32 Hot oil outlet part 33 Hot oil for lower bottom part Pipe 34 Hot oil inlet 35 Hot oil outlet

Claims (3)

A pipe-type heating device for an emulsion tank in which an asphalt emulsion is stored, wherein a hot oil pipe through which hot oil flows is provided in the emulsion tank, and the hot oil pipe is bent in the vertical direction and the horizontal direction. It is arranged along the longitudinal direction of the tank, and is configured so that the entire asphalt emulsion including the inner central portion in the emulsion tank and the outer peripheral inner surface vicinity can be heated uniformly by heat radiation from the hot oil pipe ,
The emulsion tank has an inclined portion on the bottom surface, a bottom bottom hot oil pipe is disposed at the bottom bottom of the emulsion tank, and the bottom oil hot oil pipe is connected to the bottom oil hot pipe. A pipe-type heating device for an emulsion tank, characterized in that the asphalt emulsion stored in the lowest bottom portion in the emulsion tank can be heated by heat radiation from the bottom hot oil pipe . 2. A pipe-type heating device for an emulsion tank according to claim 1 , wherein the hot oil is configured to be given thermal energy by driving an actuator that operates a mechanical element of an asphalt finisher . A pipe-type heating device for an emulsion tank in which an asphalt emulsion is stored, wherein a hot oil pipe through which hot oil flows is provided in the emulsion tank, and the hot oil pipe is bent in the vertical direction and the horizontal direction. It is arranged along the longitudinal direction of the tank, and is configured so that the entire asphalt emulsion including the inner central portion in the emulsion tank and the outer peripheral inner surface vicinity can be heated uniformly by heat radiation from the hot oil pipe,
The hot oil is pipe type heating apparatus Emulsion tank you characterized by being configured so that the heat energy is applied by the driving of the actuator for actuating the mechanical elements of an asphalt finisher.

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