JP2013064268A - Mixture heat insulation box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mixture heat insulation box that greatly improves the efficiency and safety of opening/closing operation for a discharge port during discharge of a mixture.SOLUTION: There is provided a heat insulation box B including a heat insulation chamber 12 in which a mixture (heated asphalt) is put and held and a housing 16 which houses and holds the heat insulation chamber. The heat insulation chamber 12 includes a heat insulation chamber body 13 and heat insulation means for heating and heat insulation of the heat insulation chamber body. A mixture discharge port 20 on a rear-end side of the housing can be opened and closed with a single swing mixture discharge door 42 pivoted on an upper end, and while a closing preventive linear body of the mixture discharge door 42 is arranged between a rotational end of the mixture discharge door 42 and an upper part of a housing front wall, air springs which energize the mixture discharge door 42 in a door opening direction are arranged between both sides of the mixture discharge door 42 and both edges of the mixture discharge port 20.

Description

  The present invention relates to a composite material insulation box used when construction such as road pavement is performed using a heated asphalt material (composite material). In particular, the invention relates to a composite material heat insulation box suitable for small-scale asphalt construction.

  The amount of heated asphalt material, for example, a mixed material, is usually 200 to 300 kg in small-scale asphalt pavement construction. On the other hand, the batch in the compound plant is usually 0.5 to 2 t (tons).

  For this reason, in small-scale asphalt pavement construction, the mixture remains in units of 200 to 1700 kg. Then, the remaining composite material has become unusable due to a decrease in temperature with the passage of time, and usually has to be returned to the composite plant and reheated and stirred to restore fluidity.

That is, the composite material has an asphalt kinematic viscosity of 180 ± 20 cSt (× 10 ⁻⁶ m ² / s) (Saybolt flor second 85 ± 10) and 300 ± 30 cSt (× 10 ⁻⁶ m ² / s) The temperature at which the bolt flore second is 140 ± 15) is defined as “mixing temperature” and “compaction temperature”, respectively (“asphalt pavement guideline” issuance date: 5-1-16, Japan Road Association) , P. 90).

  The conversion temperatures at which the above kinematic viscosities are obtained in asphalt (compound) are the mixing temperature: 152-157 ° C. and the compaction temperature: 140-145 ° C. Therefore, it is desirable from the viewpoint of obtaining a stable pavement surface that the composite material is paved (constructed) within a temperature drop of about 10 ° C. after preparation.

  And if the distance from the compound plant such as a remote island is long and the temperature drops during transportation, or if the compound is not available in time such as early morning, asphalt pavement itself is impossible It became.

  For this reason, conventionally, various types of mixed material insulation boxes having a heat insulating structure that can be transported by a dump truck or the like have been used.

  For example, as a composite material heat insulation box, there is a composite material heat insulation box having the following configuration previously proposed by the applicant of the present application (refer to claim 1 of Patent Document 1).

  “A mixed heat insulation box used for construction of road pavement etc. using heated asphalt material, with a material input port on the upper surface (upper side) of the box body, and a material on one side of the lower end side of the box body Self-healing hardening relaxation comprising a discharge port, an impact mitigation member comprising an inclined surface for mitigating the drop impact of the input material, and an inclined surface for mitigating the self-weight / vibration hardening of the material flowing down from the impact mitigation member A member is provided in the box body. "

  And the above-mentioned mixed material heat insulation box is placed on the loading platform (deck) of the dump truck and transported from the mixed material input station to the mixed material discharge station (asphalt construction station). Then, the discharge port lid fixed by screwing was removed to discharge the composite material (Patent Document 1, paragraph 0021).

  However, it is necessary to open and close the composite material discharge port by removing the screw outlet and tightening the screw every time the composite material is discharged, and the efficiency of the composite material discharge work, that is, asphalt construction work is not good It was.

JP 11-247122 A

  In view of the above, an object of the present invention is to provide a composite material insulation box in which the efficiency and safety of the opening / closing operation of the discharge port during discharge of the composite material are significantly improved.

  In the process of earnestly developing in order to solve the above-mentioned problems, the present inventor has come up with a composite material heat insulation box having the following configuration in which the upper end of the composite material discharge port is a hinged door. For reference, a figure symbol is attached in parentheses.

A storage room (12) for charging and holding the composite material (heated asphalt), and a housing (16) for storing and holding the storage room (12),
The warm room (12) includes a warm room body (13) and a heat retaining means for heating and warming the warm room body,
The warming room main body (13) is provided with a mixture inlet (18) on the upper side and a material discharge outlet (20) on the rear end side, and the bottom wall of the warming room main body is directed from the front end side toward the rear end side. In the mixed material insulation box that inclines downward,
The composite material discharge port (20) can be opened and closed by a single-opening material discharge port door (42) pivotally supported at the upper end, and the rotating end of the composite material discharge port door (42) and the front wall of the housing Between the upper part of (16a), the closure prevention linear body (50) of a compound material discharge port door (42) is arrange | positioned, and both sides of the said compound material discharge port door and the said compound material discharge port (20) Biasing spring means (48) in the door opening direction is arranged between both side edges of the door.

It is a top view of the heat retention box which is one Embodiment of this invention. FIG. 2 is a schematic cross-sectional view taken along the line 2-2 in FIG. FIG. 3 is a schematic sectional view taken along line 3-3 in FIG. 1. FIG. 4 is a schematic cross-sectional view taken along line 4-4 of FIG. FIG. FIG. 6 is a view (rear view) taken along line 6-6 in FIG. 1. It is a whole perspective view which shows the setting aspect to the dump truck deck of the heat retention box of FIG. It is a principal part perspective view which shows the attachment aspect of the air spring (biasing spring means) in FIG. It is a perspective view of the fastening member used when couple | bonding a heat retention box with the support bracket of a dump truck. It is a graph which shows the test result of the heat retention characteristic of the compound material at the time of using the heat retention box of this embodiment.

  Hereinafter, an embodiment of a heat insulating box B for a composite material according to the present invention will be described with reference to the drawings.

  The thermal insulation box B includes a thermal insulation room 12 for charging and holding the composite material, and a housing 16 for accommodating and holding the thermal insulation room 12. Reference numeral 14 denotes a frame for the housing 16.

  (1) As shown in FIGS. 2 to 3, the warm room 12 includes a warm room main body 13 and heat retaining means for heating and warming the warm room main body 13.

  The warming room main body 13 has a rectangular plane and is provided with a mixture inlet 18 on the upper side and a mixture outlet 20 on the rear end side.

  The bottom wall 13 c facing the composite material inlet 18 is inclined downward from the front end side toward the rear end side, that is, toward the composite material outlet 20. Although not necessarily, it is desirable from the viewpoint of the composite material discharge property that the both side portions on the lower end side of the both side walls 13b of the warming-holding body 13 are tapered in diameter as shown in FIG. Moreover, the rear end wall 13a in the thermal storage body 13 that forms the upper side of the composite material discharge port 20 is formed in a step shape (see FIGS. 3 and 5). This is because the impact during the discharge of the mixed material is reduced and the discharge is performed smoothly.

  In the composite material inlet 18, two pairs of doors 26 and 26 are arranged with hinges 30 connected to the front and rear of the housing 16 on both sides of the composite material inlet (see FIGS. 1 and 3). Plate-shaped heat insulating materials 29 and 29 are attached to the back surfaces of the doors 26 and 26, respectively. In FIG. 1, 32 and 34 are handles for opening and closing the kannon door and a receiving seat when the door is opened, and 39 is a mixture scattering prevention metal fitting.

  Further, the three opening prevention bars 38 are arranged so as to press the rotating side ends of the doors 26 and 26 so that the doors 26 and 26 can be prevented from opening when the material is discharged.

  A rectangular composite material discharge port door 42 is pin-coupled to the bracket 44 via the three rotation arms 42a at a portion corresponding to the composite material discharge port 20 of the housing 16 so as to be pivotable up and down ( (See Figs. 6 and 7). Then, by engaging a pair of hook-shaped lock levers 46, 46 attached to both ends of the rotation of the mixture outlet door 42 with the pair of lock rings 47, the mixture outlet door 42 can be locked. Has been. In addition, the inside of the composite material outlet door 42 has a heat insulating structure (not shown).

  Further, from the viewpoint of smoothly opening the composite material discharge port door 42, air springs (biasing spring means) 48 for urging in the door opening direction are arranged on both sides of the composite material discharge port door 42 so that the lock lever. At the time of releasing 46, the mixture outlet door 42 opens gently (see FIGS. 6 and 8). That is, the piston rod 48a of the air spring 48 is connected to the base side when the door 48 of the back surface notch 42b is closed by the front side bracket 49A of the back surface notch 42b on both sides of the composite material discharge door 42. It is attached via the base part side bracket 49B formed in the facing position.

  Further, as shown in FIGS. 6 and 7, a door opening maintenance chain (close-preventing linear body) 50 is arranged from the upper end of the front wall 16a of the housing 16, and the engagement rod at the center of the rotating end of the composite material outlet door 42 is disposed. It can be engaged with the portion 52. This is to maintain the door open state of the composite material discharge port door 42 accompanying the change in the tilt angle of the dump truck deck during the composite material discharge.

  (2) The heat retaining means includes a bottom surface channel 54 along the outer surface of the bottom wall (inclined surface) 13c, and a return channel 56 connecting the rear end side and the front end side of the bottom surface channel 54. Provide (see Figures 3 and 4). Further, a heating means (planar heater) 58 is provided on the rear end side (mixing material discharge port 20 side) of the bottom surface channel 54, and the heat medium filling the bottom surface channel 54 and the return channel 56 is convection. Circulation is possible. In the present embodiment, the both side walls 13b and 13b are further communicated with the bottom surface channel 54 at the lower end, and the front surface channel 59 and the side surface channels 60 and 60 along the both walls 13b and 13b are provided. Provided (see FIGS. 2, 3 and 4).

  Here, the front surface flow channel 59 mainly functions as a heat medium supply channel with the following configuration. A heat medium supply port 62 is provided in the upper central portion of the front surface flow passage 59, and the lower end portion of the front wall 13d of the warming body 13 forming the rear surface side of the front surface flow passage 59 is extended. The flow dividing wall 64 includes a plurality of (2 to 5) flow dividing holes 64a (see FIGS. 1 and 3). The shunting partition 64 is for smooth supply of the heat medium to the bottom surface channel 54 and the side surface channel 60 in the width direction. In FIGS. 1 and 3, 62a is a temperature sensor, 62b is an overflow port, and 61 is a control box. The control box 61 is responsible for energization control of the planar heater 58 by a detection signal from the temperature sensor 62a.

  Although not necessarily, the bottom surface flow channel 54 has a plurality of reinforcing ribs 54a open at the front and rear sides, and the side surface flow channel 60 has a plurality of reinforcement ribs 60a open at the top and bottom. Is arranged (see Figs. 2, 4 and 5). This is to promote the convection circulation of the heat medium in each planar flow path 54, 60 and to reinforce each planar flow path. The reinforcing ribs 54a and 60a are usually the same as the height of each of the flow paths 54 and 60. However, the height of the reinforcing ribs 54a and 60a may be ½ or more from the viewpoint of convection circulation of the heat medium.

  In addition, various high-temperature organic heat media (oil) can be normally used as the heat medium.

  (3) The housing 16 usually stores and holds the warming chamber 12 via a housing frame (partial omitted) 14 (see FIG. 3). Then, the gap between the thermal storage 12 and the housing 16 is filled with a heat insulating material (not shown) such as polystyrene foam.

  And the suspension ring 74 is distribute | arranged to four corners of the upper surface of the ceiling wall 72 of the housing 16 (refer FIG.1,3,7). The hanging ring 74 engages with a hanging hook (not shown) attached to a wire when the heat retaining box B is loaded on or unloaded from a dump truck loading platform using a hoist crane or the like. Further, on both sides of the upper end of the front wall 75 of the housing 16, a chain block engaging ring for attaching a chain block (tensile fastener) CB for fixing to the cargo bed via an upper hook when the dump truck's cargo bed is inclined. 76 is arranged (see FIGS. 3 and 7). The tension fastener is not limited to the chain block, and may be a turnbuckle or the like.

  Also, a coupling bracket 78 is formed on the rear end upper end side of the both side walls 79 of the housing 16 (see FIGS. 1, 3, 7 and 8). Each coupling bracket 78 has a coupling long hole 78a for coupling with the engagement support bracket SB of the tailgate fixing handle LH formed at the rear upper end of the side gate SG of the dump truck carrier. The coupling bracket 78 and the engagement support bracket SB can be coupled to each other by attaching a set fixture 80 having the following configuration shown in FIGS. The fixing bracket 80 can stably hold the rear end side of the heat insulation box B of the present invention.

  A coupling rod 82 having a circular fitting portion 82a and an outer seat portion 82b having an outer diameter slidable in the coupling elongated hole 78a at one end and coupled to the housing rear wall 77 and a female threaded portion 82c at both ends. An angle seat plate 84 that contacts the inside of the bracket 78, a box-side fixing bolt (outer fixing bolt) 86 for attaching the coupling bracket 78 via the angle seat plate 84, and a rear end of the cargo bed side gate SG. It comprises a loading platform side fixing bolt (inside fixing bolt) 88 that is fixed to the engaged support bracket (loading platform) SB, and a fixing ring 90 that is interposed between the loading platform side fixing bolt 88 and the outer surface of the support bracket SB. The In the illustrated example, the pivot pin hole 94 of the support bracket SB has a detachable opening 94a, and the detachable opening 94a has a lock handle LH for a tailgate that fits into the detachable opening 94a of the support bracket SB. It is a configuration. The pivot pin hole 94 of the upper support bracket SB may be a closed ring. In that case, of course, the lock handle LH for the tailgate is not provided.

  As the planar heater 58, specifically, a “silicon rubber heater” (specification: 450 mm × 600 mm × 3 mmt, single phase 100 V, 1500 W), which has been developed by NASA (American Aerospace Agency), is suitable. Can be used for When large heat retention and heating properties are required, a plurality of sheets may be used.

  Moreover, the discharge port side wall inner side provided with the composite material discharge port 20 of the warming-holding body 13 may be an inclined surface that further goes inward toward the lower end side. This inclined surface prevents the composite material from being hardened by its own weight in the vicinity of the discharge port 20, and prevents the composite material from flowing down from the discharge port more than necessary due to the flow of the composite material one after another from above. Has an effect. At this time, the inclination angle of the inclined surface with respect to the side wall varies depending on the size of the box or the like, but is 3 ° to 15 °.

  The size of the warming room main body 13 is, for example, one that can be charged (filled) with 1.5t of mixture, and has an outer diameter, a length of 1970 cm, a width of 1220 cm, a rear height of 691 cm, and a front height of 787 cm. The size of the composite material discharge port 20 in this size is assumed to be height: about 24 cm and width: about 75 cm.

  Next, the usage mode of the heat insulation box B of the said embodiment is demonstrated. Here, a description will be given by taking as an example a dump truck in which the left and right gates (left and right tilts) of the loading platform are fixed and only the tail gate (rear tilt) is opened and closed (see FIG. 7).

  (1) The heat insulation box B of the present embodiment is usually used by being fixed to a dump truck bed (deck). The tailgate is removed in advance, and the left and right support brackets SB for the tailgate can be used.

  First, the mixture discharge port door 42 of the mixture discharge port 20 of the heat retaining box B is closed, and the lock lever 46 is engaged with the engagement flange portion 47 to be locked. The doors 26 and 26 are closed, and the doors 26 and 26 cannot be opened and closed by an opening prevention bar 38. At this time, a mixture adhering prevention cover (not shown) is put on the intermediate receiving bar 27 of the kannon door 26 at the center inlet.

  In this state, the suspension hook 74 of the hoisting wire such as a hoist is engaged with the suspension ring 74 of the housing upper surface wall 72 of the heat retaining box B, and is suspended and placed at a predetermined position on the deck of the dump truck DC ( (See FIG. 7).

  At this time, the axis of the pivot pin hole 94 of the support bracket SB is aligned with the longitudinal center axis of the bracket long hole 78a of the coupling bracket 78 of the heat retaining box B. Then, the fitting portion 82 a of the coupling rod 82 is fitted into the coupling long hole 78 a from the outside of the coupling bracket 78. At the same time, with one of the angle seat plates 84 abutting from the inside of the coupling bracket 78 and the other abutting against the housing rear wall 77, the fastening bolt 86 is screwed into the female thread of the coupling rod 82 and fixed. (See FIG. 8).

  Subsequently, a fixing bolt 88 is screwed into the female screw 82 c at the other end of the coupling rod 82 via the fixing ring 90 and fixed to the female screw at the other end of the coupling rod 82.

  Here, since the coupling bracket 78 has a long coupling hole 82a and the coupling rod 82 has a length sufficient to absorb the variation width of the distance between the side gates of the loading platform, Even if the height and width of the distance between the gates are different, the rear side of the heat insulation box can be stably held on the track deck.

  Further, with the upper hook of the chain block CB on the box front end side engaged, the lower hook is engaged with the wire coupling ring 96 on the lower side of the left and right gates of the loading platform, and the chain of the chain block CB is Install.

  Thus, the heat insulation box cannot be detached from the dump carrier, and furthermore, the heat discharge box door 42 and the material input doors 26 and 26 cannot be opened and closed.

  In this state, the dump truck DC is moved to the mixture feeding station. Then, the opening prevention bar 38 is removed at the compound material charging station, and the compound material inlet doors 26 and 26 are opened. In this state, a composite material having a predetermined temperature (for example, a surface temperature of 140 ° C. and an internal temperature of 160 ° C.) is supplied from the composite material inlet 18. When the composite material is charged, the sheet heater switch is energized (turned on) in advance through the control panel 61. It is desirable to cover the intermediate receiving bar 27 at the front and rear joint position of the composite material inlet door 26 with a composite material scattering prevention cover. It is possible to prevent the mixture from adhering to the intermediate receiving bar 27 and hindering the sealing degree of the mixture entrance door 26.

  Then, after charging the mixture, the mixture entrance doors 26 and 26 are closed again, and the opening gates 26 and 26 cannot be opened by the opening prevention bars 38, 38,.

  Here, the heat medium temperature is controlled to a predetermined temperature by energizing / de-energizing the planar heating element by a temperature signal from the temperature sensor. At this time, the heat medium is convectively circulated through the return channel 56 along the bottom surface channel 54 and the side surface channels 60 on both sides of the storage room body 13. For this reason, the inside of the thermal storage main body 13 is generally kept warm, and the temperature of the mixture is maintained for a long time.

  Then, at the place where asphalt construction is performed using the composite material, the composite material discharge port 20 is opened at the time of use, the dump truck bed is inclined at an appropriate angle, and the composite material flows down to the pavement construction position (construction site). Let At this time, since the temperature of the composite material has not decreased, the composite material is smoothly discharged from the composite material discharge port.

  At that time, the door opening maintaining chain 50 connects between the rotating end of the composite material outlet door 42 and the upper end of the box front wall above the composite material outlet 20. For this reason, even if the inclination angle of the deck of the dump truck is reduced, the composite material outlet door 42 is not suddenly closed. Further, since the air discharge 48 exists when the composite material outlet door 42 rotates in the closing direction from a state where the inclination angle of the dump truck deck is large and the door open maintenance chain 50 is opened more than can be maintained, the composite material is provided. The discharge door 42 is not suddenly closed. The operator is not shocked by the sudden rotation of the door.

  When a predetermined amount of the composite material is discharged, the dump truck loading platform 42 is closed with the discharge port door 42 in parallel with the inclination of the dump truck bed. In this way, the mixture is kept warm in the heat insulation box B and stored. Even during the storage, since the inside of the heat insulating box B is maintained at a high temperature, the composite material does not decrease to the curing temperature.

  FIG. 10 shows the heat retention characteristics of the surface temperature of the composite material and the internal temperature of the composite material when the composite material is put in the heat insulation box B of the present embodiment and the heating medium is not heated, and the heat after the sheet heater is energized. It shows the temperature change of the medium. It can be seen from FIG. 10 that the temperature drop of the composite material can be suppressed by the heat medium.

12 Insulation chamber 13 Insulation chamber body 16 Housing 20 Compound material outlet 42 Compound material outlet door 48 Air spring (biasing spring means)

Claims (3)

A storage room for storing and holding a mixture (heated asphalt), and a housing for storing and holding the storage room,
The warm room is provided with a warm room body and a heat retaining means for heating and warming the warm room body,
The warm room main body is provided with a mixed material inlet on the upper side and a mixed material outlet on the rear end side, and the bottom wall of the warm room main body is inclined downward from the front end side toward the rear end side. In
The composite material discharge port can be opened and closed by a single-sided composite material discharge port door pivotally supported at the upper end, and the composite material is disposed between the rotating end of the composite material discharge port door and the upper portion of the front wall of the housing. An outlet door closing prevention linear body is disposed, and biasing spring means in the door opening direction is disposed between both sides of the composite material discharge port door and both side edges of the composite material discharge port. Mixed material insulation box characterized by.   2. The composite material insulation box according to claim 1, wherein the biasing spring means is an air spring. A coupling bracket having a vertically long hole is fixed from the rear ends of both side walls of the housing, and a coupling rod having a circular fitting portion that can slide up and down the long hole through the long hole is provided as an angle seat. Further, the coupling rod can be non-removably fitted into the fitting hole of the tailgate support bracket of the loading platform side gate, and
A lifting ring is provided at at least four corners of the ceiling surface of the housing, and an engagement ring is further provided on both sides of the front end of the housing to which a hook of a tension fastener such as a chain block can be engaged. Item 3. The mixed material insulation box according to Item 1 or 2.

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