JP2004018052A - Tank lorry for carrying heated molten substance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating type tanker for carrying, discharging or sucking a plurality of kinds of heated molten substances such as asphalt without waste. <P>SOLUTION: The tanker for carrying heated molten substances has a first tank with a stored substance heated by a heating means and at least one second tank provided at a position with a space in the first tank interposed from the heating means. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tank lorry vehicle for transporting a heated melt, which can transport a plurality of types of heated melts such as heated asphalt efficiently and with minimal heat deterioration.
[0002]
[Prior art]
Tank trucks that carry multiple types of liquid are already known. For example, Japanese Patent Laid-Open No. 9-142571 discloses a tank lorry in which ultra-low temperature liquefied gas is stored in a plurality of tank containers, and Japanese Patent Publication No. 2002-67783 discloses the same or various contents in one tank lorry. A tank lorry with improved flexibility that can be transported simultaneously is disclosed. However, these are all for transporting contents that do not require a heating device, and are not capable of simultaneously transporting a plurality of types of heated melts in a heated state.
[0003]
On the other hand, for example, two types of tank lorries for transporting a heated melt such as asphalt are known: a heat retention type tank lorry that can only retain heat, and a heating type tank lorry equipped with a heating device. Regardless of the type of tank lorry used, a predetermined amount of heated and melted asphalt is loaded into the tank lorry tank and transported to, for example, the asphalt mixture production plant, which is the delivery destination, and the tank is placed in the asphalt kettle at the delivery destination. In general, the entire amount of the asphalt is directly discharged, so that the discharge of the asphalt that is the heated melt can be completed in a relatively short time. Therefore, there is no need to worry about the temperature drop of asphalt at the time of discharge, and if there is no fear of extreme temperature drop between loading and discharging, a heat retaining tank lorry is used, and between loading and discharging A heating tank lorry that can heat the asphalt in the tank has been used only when long time is required or when it is highly likely that it will be difficult to discharge due to viscosity increase due to the temperature drop of the asphalt at the time of discharge It was.
[0004]
However, in recent years, the number of cases using modified asphalt with improved functionality by devising the formulation of raw materials has increased, and when transporting such modified asphalt using a tank truck, Instead of discharging the entire amount of asphalt that has been transported from the tank lorry to the customer's asphalt kettle as before, the tank holly's discharge hose is directly connected to the customer's asphalt measuring tank and the transported asphalt is weighed. However, there are increasing cases of discharging into a measuring tank in units of a predetermined amount. The main reasons are as follows. That is,
1) When using modified asphalt that has been improved in functionality by improving the formulation of raw materials, whether the target asphalt mixture can actually be produced and the physical properties of the produced asphalt mixture are expected Test kneading is performed to check whether or not the amount of the modified asphalt used for the test kneading is usually a small amount of 50 to 300 kg, which can be discharged into a measuring tank. Be.
2) Asphalt kettles installed in asphalt mixture production plants and the like usually contain dead asphalt dead stock, and when modified asphalt is discharged into such asphalt kettles, The problem is that different types of asphalt mix with each other, causing contamination of the material, resulting in degraded performance of the modified asphalt.
3) When the modified asphalt has a particularly high viscosity, the pump installed in the asphalt mixture manufacturing plant at the customer's destination is insufficient in capacity, and once the asphalt kettle receives the modified asphalt, the next metering from the asphalt kettle It may be difficult to transfer to a tank.
For the reasons described above, tank holly discharge hoses are connected directly to the delivery tank, and asphalt, a hot melt, is often discharged from the tank lorry directly into the tank. Yes.
[0005]
However, the metering tank is for measuring the amount of the asphalt mixture to be used for the production of one batch, and the heated asphalt transported by the tank lorry cannot be discharged to the measuring tank at a stretch. During manufacturing, the tank lorry will be restrained with the discharge hose connected to the metering tank. As a result, the discharge time often takes a long time, and the temperature of the asphalt in the tank truck is inevitably lowered. In addition, simply using a heat retaining tank lorry causes the temperature to decrease as the asphalt in the tank lorry decreases, and there are many situations where heating with a burner is indispensable. For this reason, the case where a heating type tank lorry is used is increasing regardless of the length of delivery time or the amount of delivery.
[0006]
However, in a heating type tank lorry, a flue is usually installed in the tank as a heating means, and the asphalt is heated by contacting the flue with the asphalt in the tank. For this reason, when heating is performed, the flue must be buried in the asphalt in the tank, but the maximum loading capacity of the heating type tank lorry is usually 10 to 13 tons, and such maximum In a heating-type tank lorry having a load capacity, it is necessary that at least about 3 tons of asphalt exists in the tank in order to keep the flue buried in the asphalt. Therefore, even when there is a demand for asphalt as small as 50 to 300 kg used for test kneading, in addition to the required amount of asphalt, when using a conventional heating type tank lorry, at least about There is an inconvenience that 3 tons of asphalt must be manufactured and transported, which is wasteful.
[0007]
Moreover, asphalt in the tank of a tank truck is heated by contacting the flue as described above, but the flue is heated to 200 ° C. or more by the burner. Asphalt existing in the vicinity of the road is exposed to a high temperature, and there is a problem that heat deterioration is likely to occur. In particular, when the amount of asphalt in the tank is small, the temperature drop is fast, so the frequency of heating increases and thermal degradation tends to proceed. Therefore, in consideration of economic efficiency, when only the minimum necessary amount is transported, not only does the risk of causing the performance of the asphalt contained in the tank to deteriorate due to heating, but it is also discharged at the delivery site. However, even if the asphalt remaining in the tank lorry was taken home, the quality had already deteriorated, and eventually, there was a dilemma that the material had to be reworked or had to be discarded, and the waste of the material increased.
[0008]
In addition, when two or more types of asphalt are delivered using a conventional heated tank lorry, even if each delivery amount is small, as many tank lorries as the number of types of asphalt are required. Considering that extra asphalt is needed to keep the flues buried in the city, and that the asphalt that is transported and brought back is subject to thermal degradation and needs to be reworked, the waste of materials and energy is very It was something.
[0009]
[Problems to be solved by the invention]
The present invention was made to solve the above-described problems of the prior art, and a heating type tank lorry capable of transporting and discharging a plurality of types of heated melts such as asphalt without waste of materials. The issue is to provide.
[0010]
[Means for Solving the Problems]
The present invention solves the above problem by providing at least one second tank provided at a position where a space in the first tank is interposed between the first tank in which the contents are heated by the heating means and the heating means. The problem is solved by providing a tank lorry for transporting a heated melt comprising a tank.
[0011]
That is, the heated melt transporting tank lorry of the present invention is provided with at least two tanks, a first tank and a second tank, and the contents in the first tank are directly heated by a heating means such as a flue. However, the contents in the second tank are always indirectly through the contents in the first tank because the space in the first tank is interposed between the second tank and the heating means. It will be heated. For this reason, even if the contents in the second tank are small, there is no risk of overheating and thermal degradation. Therefore, for example, the modified asphalt and color binder used for test kneading are accommodated in the second tank, and a small amount of inexpensive straight asphalt is accommodated in the first tank, so that only a small amount is used. Heated melt such as modified asphalt can be transported to a delivery destination and discharged to a weighing tank or the like in a state of being heated moderately and without the risk of thermal degradation. Since straight asphalt accommodated in the first tank is accommodated in a large amount, there is little risk of thermal deterioration, and even if it is taken home, it can be used without waste for processing into a product.
[0012]
Of course, in some cases, asphalt as a product of a different type from the modified asphalt etc. accommodated in the second tank is accommodated in the first tank, and the same as the contents in the second tank, The contents in one tank may be discharged into an asphalt kettle or a measuring tank at the delivery destination. Moreover, if the third and fourth tanks are further provided at the position where the space in the first tank is interposed between the heating means and the second tank, it is possible to carry various kinds of heated melts. Needless to say, you can.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings.
[0014]
FIG. 1 is a side view showing an example of a tank lorry for transporting a heated melt according to the present invention, in which only the tank portion is shown as a cross-sectional view. In FIG. 1, 1 is a tank lorry for transporting a heated melt according to the present invention, 2 is a first tank, and 3 is a second tank. Reference numeral 4 denotes a flue, in which fuel such as kerosene or light oil is burned by a burner 5, and the hot flue gas is passed through the flue to heat the flue and in the first tank 2 in contact with the flue. It is intended to heat the contents. 6 is a baffle plate for preventing the contents in the first tank 2 from moving unnecessarily when the tank lorry starts or stops, etc. If it is unnecessary, it may not be provided. Reference numeral 7 denotes a manhole.
[0015]
FIG. 2 is a cross-sectional view taken along the line XX of FIG. 1, in which the first heated melt 8 and the second heated melt 9 are accommodated in the first tank 2 and the second tank 3, respectively. Represents. As shown in FIG. 2, the flue 4 is in the first tank 2 and is buried in the first heating melt 8, and the first heating melt 8 is heated by the flue 4. Is in a state. On the other hand, the second heated melt 9 is accommodated in the second tank 3, but as is apparent from the figure, the first heated melt 9 is interposed between the second tank 3 and the flue 4 as the heating means. There is a space in the tank 2, and the space in the first tank 2 is filled with the first heated melt 8. Therefore, the second heated melt 9 accommodated in the second tank 3 is heated through the first heated melt 8 without directly contacting the flue 4 as the heating means. By being in contact with the side wall of 3, it is indirectly heated, and there is an advantage that even if it is a small amount, there is no fear of thermal degradation. In addition, since the second tank 3 is surrounded by the heated melt 8 in the first tank 2, the temperature of the second tank 3 is generally maintained, and the temperature is hardly lowered during transportation or discharge at the delivery destination. There is a feature that does not wake up. For this reason, if the tank lorry 1 for carrying a heated melt according to the present invention is used, even if it is a small amount of asphalt of 50 to 300 kg that is used for test kneading, the temperature can be kept at a predetermined temperature without worrying about thermal deterioration. It can be transported to a delivery destination in a maintained state and slowly discharged into a weighing tank.
[0016]
In the heated melt carrying tank lorry 1 of the present invention, the volume of the second tank 3 is usually smaller than the volume of the first tank 2, and the demand for the second tank 3 is relatively smaller than that of the first tank 2. A small amount of heated melt is accommodated. Examples of the second heated melt 9 accommodated in the second tank 3 include paving materials having various functions such as modified asphalt and a color binder. Not limited to this, any heat-melted material that is likely to suffer from thermal degradation may be used.
[0017]
On the other hand, the first heated melt 8 accommodated in the first tank 2 having a larger volume than the second tank 3 includes, for example, inexpensive straight asphalt. Any heat-melted material that is considered to be inexpensive and has a low possibility of undergoing thermal degradation may be used. Further, the amount of the storage is such that the flue 4 as the heating means is buried and the space in the first tank 2 interposed between the second tank and the flue 4 as the heating means is filled. Although there is no particular limitation, it is desirable to accommodate as much as possible from the viewpoint of reducing the possibility of thermal degradation and enveloping and heating or keeping the second tank 3 from the surroundings. Needless to say, the first heated melt 8 accommodated in the first tank 2 may be transported as a product and discharged to an asphalt kettle, a measuring tank, or the like at the delivery destination.
[0018]
In the example of FIGS. 1 and 2, the first tank 2 and the second tank 3 are both circular in cross section. However, the cross sectional shapes of the first tank 2 and the second tank 3 do not necessarily have to be circular, and are elliptical. , Square or other shapes. Moreover, in the example of FIG. 1, FIG. 2, the 2nd tank 3 exists in the relationship accommodated completely in the 1st tank 2, but both relationship is 1st between a heating means and a 2nd tank. As long as the space in the tank is interposed, for example, as shown in FIG. 3, the second tank 3 may be partially accommodated in the first tank 2, or as shown in FIG. In addition, the two second tanks 3 and 3 may be located on both sides of the first tank 2. Furthermore, the position of the flue 4 as the heating means may be placed in the second tank 3, and the relationship between the first tank 2 and the second tank 3 may be reversed from that shown in the figure. In the case where a plurality of second tanks 3 are provided, the plurality of second tanks 3 may be arranged in the front-rear direction of the heated melt carrying tank lorry 1.
[0019]
Further, as the heating means, the flue heated by the burner is exemplified, but the heating means usable in the present invention is not limited to the flue, and an oil heater for circulating the heated oil, an electric heater, etc. Any means can be used as long as it can heat the heated melt.
[0020]
FIG. 5 is a diagram showing an example of a piping system of the tank lorry for transporting a heated melt according to the present invention. In FIG. 5, reference numeral 10 denotes a pressurized gas introduction pipe, which is connected to a pressurized gas source such as a compressor (not shown) and is added to the first tank 2 and the second tank 3 via the on-off valves 101 and 102. It is a pressurized gas introduction line for introducing pressurized gas. The pressurized gas is used to send the heated melt contained in the first tank 2 and the second tank 3 to the outside by gas pressure, to purge the inside of the first tank 2 and the second tank 3, or to be described later. It is used to blow away the inside of the discharge hose.
[0021]
11 is a discharge pipe for discharging the heated melt in the first tank 2 and / or the second tank 3 to the outside, and in the illustrated example, a connecting pipe 12 connected before and after the first tank 2; 12 and the connection pipe 13 connected to the second tank 3 via a switching valve 111 and an on-off valve 112, respectively. A pump 14 is provided in the middle of the discharge pipe 11, and a bypass pipe 16 is provided for the pump 14 via a first switching valve 15. Reference numeral 17 denotes a second switching valve having a function of switching whether the discharge pipe 11 is connected to the discharge hose 18 side or the return pipe 19 side. The position of the second switching valve 17, that is, the position where the return line 19 branches is in the middle of the discharge line 11 in the illustrated example, but the connection point between the discharge line 11 and the discharge hose 18. Alternatively, the second switching valve 17 may be positioned to branch the return line 19, or the second switching valve 17 may be positioned in the middle of the discharge hose 18 and the return line 19 may be routed from there. It may be branched. The return pipeline 19 is connected to the first tank and the second tank via the switching valve 191.
[0022]
Reference numeral 20 denotes a gas discharge pipe for discharging gas from the first tank 2 and / or the second tank 3 to the outside, which is connected to the first tank 2 and the second tank 3 via the on-off valves 201 and 202, respectively. Has been. Reference numeral 21 denotes a discharge hose discharge pipe branching from the middle of the gas discharge pipe 20 and connected to the discharge pipe 11 via the on-off valve 211, and has a function of blowing off the discharge hose 18 as appropriate. . In the example shown in the figure, the discharge hose discharge pipe 21 is connected to the discharge pipe 11, but may be connected to a connection point between the discharge pipe 11 and the discharge hose 18 or in the middle of the discharge hose. . In addition, 22 and 23 are safety valves for the first tank 2 and the second tank 3. The various on-off valves, switching valves, pumps, and the like are desirably placed in a heated state or a heat-retaining state, and are most conveniently arranged in the first tank 2. Further, by providing an openable / closable communication path communicating with the first tank 2 at the bottom of the second tank 3, the first tank 2 and the second tank 3 can be used in an integrated manner in some cases. It is.
[0023]
The operation of the illustrated piping system will be described with reference to FIG. 5. First, in order to discharge the heated melt in the second tank 3 to the outside by the pump 14, the pump 14 is driven and the on-off valve 112 is operated. The first switching valve 15 is set to a position where the bypass line 16 is closed and the pump 14 is incorporated in the discharge line 11. Subsequently, when the second switching valve 17 is set to the discharge hose 18 side, the heated melt in the second tank 3 is discharged from the discharge hose 18 to the outside. In this state, if the second switching valve 17 is switched to the return line 19 side and the switching valve 191 is set to the second tank 3 side, the heated melt discharged from the second tank 3 by the pump 14 is again returned. It is possible to return to the second tank 3. By providing such a return pipe 19, for example, as will be described later, the amount of heat melt received by a measuring tank at a delivery destination becomes a predetermined amount, and the heat melt is discharged from the discharge hose 18. When it is desired to stop the operation temporarily, there is no need to stop the pump 14, which is convenient.
[0024]
The same applies to the case where the heated melt in the first tank 2 is discharged, and the on-off valve 112 is closed and the switching valve 111 is brought into communication, whereby the heated melt in the first tank 2 is discharged from the discharge hose 18. It can be discharged out of the system. In this state, when the second switching valve 17 is switched to the return line 19 side and the switching valve 191 is set to the first tank 2 side, the heated melt discharged from the first tank 2 by the pump 14 is again returned to the first tank 2 side. Similarly, it can be returned to the inside of one tank 2. Further, by appropriately operating the switching valve 111, the on-off valve 112, and the switching valve 191, for example, the heated melt in the first tank 2 is transferred to the second tank 3 or, conversely, in the second tank 3. It is also possible to transfer the heated melt to the first tank 2.
[0025]
On the other hand, in order to discharge the heated melt in the first tank 2 and / or the second tank 3 out of the system without using the pump 14, the on-off valve 101 and / or 102 is opened and the pressurized gas is introduced. A pressurized gas is introduced from the pipe line 10 into the first tank 2 and / or the second tank 3, and the internal heated melt is sent out to the discharge pipe line 11 by the gas pressure, and the first switching valve 15 is connected to the bypass pipe line. By switching to the side 16, the heated melt in the first tank 2 and / or the second tank 3 can be discharged out of the system from the production hose 18. Further, in this state, if the switching valve 111 and the on-off valve 112 are closed and the on-off valve 201 and / or 202 is opened, the inside of the first tank 2 and / or the second tank 3 from the pressurized gas introduction line 10 The pressurized gas introduced into is discharged from the gas discharge line 20 to the outside of the system. At this time, if the on-off valve 211 provided in the discharge hose discharge conduit 21 is opened, the pressurized gas to be discharged is introduced into the discharge hose 18 through the discharge hose discharge conduit 21. Can be blown away.
[0026]
FIG. 6 is a diagram for explaining the operation in the case of discharging the heated melt by directly connecting the discharge hose 18 of the tank lorry for transporting the heated melt of the present invention to the measuring tank. In the piping system of FIG. Only relevant parts are shown. In FIG. 6, 24 is a metering tank, 25 is a pump, 26 is an asphalt injection device, 27 is a mixer, and 28 is a signal from the metering tank.
[0027]
In FIG. 6, the heated melt in the second tank 3, for example, reformed asphalt, is discharged from the discharge hose 18 into the measuring tank 24 by the operation of the pump 14. The measuring tank 24 is provided with a measuring instrument (not shown). When the amount of the heated melt such as the modified asphalt received reaches a predetermined amount, a signal 28 is generated. The switching valve 17 is operated so that the flow of the heated melt is returned to the return pipe 19 side and returned into the first tank 2 and / or the second tank 3. By doing so, even if the pump 14 of the tank lorry body does not stop operation, the heated melt is not sent to the discharge hose 18, and an extra load is applied to the pump 14 or a pressure load is applied to the entire piping system. It will not take. Moreover, since the 2nd switching valve 17 switches automatically based on the signal 28 from the measurement tank 24, discharge | emission of the heating melt to the measurement tank 24 is stopped without bothering an operator's hand. be able to. When the heated melt such as modified asphalt received by the measuring tank 24 is discharged to the mixer via the asphalt injection device using the pump 25, and the measuring tank 24 returns to a state where the heated melt can be received again. Based on the signal 28 from the measuring tank 24, the second switching valve 17 is switched to the discharge hose 18 side again. By doing so, it is possible to automatically discharge the heated melt into the measuring tank 24 a plurality of times. It goes without saying that the heated melt can be sucked from the discharge hose 18 by reversely rotating the pump 14 provided in the middle of the discharge pipe 11.
[0028]
【The invention's effect】
As described above, according to the tank lorry for transporting a heated melt of the present invention, one or a plurality of types of heated melt can be heated without fear of material waste or thermal deterioration even if the amount is small. It can be transported in a state and discharged to the required location. Moreover, the tank lorry for transporting a heated melt according to the present invention has a return pipe, and by switching between the discharge hose and the return pipe by a switching valve, the heating and melting from the discharge hose without stopping the operation of the pump. You can start, stop, and restart the discharge of things. Furthermore, by controlling the operation of the switching valve based on a signal from the heated melt receiving side, the heated melt can be automatically discharged, stopped and re-discharged in a predetermined unit. It is extremely effective for labor saving.
[Brief description of the drawings]
FIG. 1 is a side view showing an example of a tank lorry for transporting a heated melt according to the present invention.
2 is a cross-sectional view taken along the line XX of FIG.
FIG. 3 is a side view showing another example of the arrangement form of the tank.
FIG. 4 is a side view showing still another example of the arrangement form of the tank.
FIG. 5 is a view showing an example of a piping system of a tank lorry for transporting a heated melt according to the present invention.
FIG. 6 is a diagram for explaining the operation of the piping system during discharge.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Heated tank conveyance tank lorry 2 1st tank 3 2nd tank 4 Flue 5 Burner 6 Baffle plate 7 Manhole 8 1st heated melt 9 2nd heated melt 10 Pressurized gas introduction line fiber 11 Discharge pipe Lines 12, 13 Connection pipes 14, 25 Pump 15 First switching valve 16 Bypass line 17 Second switching valve 18 Discharge hose 19 Return line 20 Gas discharge line 21 Discharge hose discharge line 22, 23 Safety valve 24 Metering Tank 26 Asphalt spraying device 27 Mixer 28 Signal

Claims (4)

A heated melt comprising a first tank in which the contents are heated by the heating means, and at least one second tank provided at a position where a space in the first tank is interposed between the heating means. Tank truck for transportation. A pressurized gas introduction line for introducing pressurized gas into the first tank and / or the second tank via an on-off valve, a discharge hose for discharging the heated melt in the first tank and / or the second tank to the outside, and It has a discharge pipe connecting the first tank and the second tank, and a pump provided in the middle of the discharge pipe, branches from the discharge pipe via the first switching valve, bypasses the pump and again A bypass pipe that joins the discharge pipe, and a position closer to the discharge hose than the junction of the discharge pipe and the bypass pipe, the discharge pipe or the discharge pipe and the discharge hose via the second switching valve A tank lorry vehicle for transporting a heated melt according to claim 1, further comprising a return pipe branching from the connection point or the discharge hose and returning to the first tank and / or the second tank. Based on a signal from the outside, a position at which the second switching valve discharges the heated melt from the discharge hose to the outside and a position to return to the first tank and / or the second tank via the return pipe line The tank lorry vehicle for transporting a heated melt according to claim 1 or 2, which can be automatically switched. A gas discharge pipe for discharging gas from the first tank and / or the second tank to the outside through an on-off valve, and a branch from the middle of the gas discharge pipe, and near the discharge hose or the discharge hose through the on-off valve A tank lorry vehicle for transporting a heated melt according to claim 1, 2 or 3, further comprising a discharge hose discharge conduit connected to the discharge conduit.

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