CN213625139U - Heat preservation discharge gate structure and have its road surface maintenance car - Google Patents

Abstract

The utility model relates to a heat preservation discharge gate structure and have its road surface maintenance car: the heat preservation layers are arranged in the wall of each discharge box and in the bottom door, so that the passive heat preservation of the discharge hole is realized. On the basis of passive heat preservation, all be equipped with heating oil pipe in the above-mentioned heat preservation, all there is the oil pipe that send to connect each other heating oil pipe between each heat preservation, and the conduction oil in the pavement maintenance truck heat conduction oil system passes through each heat preservation through the oil pipe that sends, realizes initiatively keeping warm. The utility model discloses with the help of initiative and passive heat preservation, effectively prevented the heat in the feed bin to scatter and disappear to the external world through the discharge gate, prevented that hot mix bituminous mixture from cooling the phenomenon of caking in discharge gate department, compact structure is reasonable moreover, and simple to operate has realized outstanding heat preservation effect under the condition that does not increase extra heat source.

Description

Heat preservation discharge gate structure and have its road surface maintenance car

Technical Field

The utility model relates to a road surface maintenance car that keeps warm discharge gate structure and have it belongs to road maintaining mechanical equipment technical field.

Background

When repairing a pit of an asphalt pavement, a pavement maintenance truck needs to transport a hot-mix asphalt mixture (HMA) produced by a mixing plant to a construction section in a heat preservation manner, and the delivery temperature of the hot-mix asphalt mixture is 140-160 ℃, and the asphalt bonding performance of the hot-mix asphalt mixture is poor after the temperature is lower than 120 ℃, so that the hot-mix asphalt mixture cannot be used for construction. The existing pavement maintenance truck is generally provided with a discharge port only at the tail end of a spiral groove of a spiral conveyor in a storage bin, an inserting plate matched with the spiral groove is arranged on the discharge port, the inserting plate is inserted and fixed during driving, the inserting plate is taken down when the discharging is needed, and hot-mixed asphalt mixture in the storage bin is conveyed to the discharge port by the spiral conveyor and falls into a pit groove. Because the single-layer inserting plate and the discharging box are made of metal materials, the sealing performance of the inserting plate is poor, heat is dissipated to the outside quickly through the discharging port in the transportation process, the hot-mixed asphalt mixture is cooled to below 120 ℃ after the hot-mixed asphalt mixture reaches a construction road section, and even the hot-mixed asphalt mixture is cooled and agglomerated at the discharging port to cause the situation that the hot-mixed asphalt mixture cannot be discharged, so that the pit slot repairing quality and the construction progress are influenced.

The Chinese invention with the bulletin number of CN106436543A discloses a double-sealing discharging door mechanism of a pavement maintenance vehicle, which comprises a discharging end supporting seat, a spiral material door, a supporting seat material door, an upper cover plate, an execution component and a connecting bracket, wherein the upper part and the lower part of the discharging end supporting seat are both of open square box structures, the discharging end supporting seat is arranged on the wall of a bin of the pavement maintenance vehicle, a discharging hole is formed in one surface, connected with the wall of the bin, of the discharging end supporting seat, and a spiral conveyor in the bin penetrates through the discharging hole and is sleeved inside the discharging end supporting seat; the screw conveyor is supported and mounted on the rear end face of the discharge port supporting seat, side sliding grooves are additionally formed in the lower portions of the left side and the right side of the discharge end supporting seat, and a rear sliding groove is additionally formed in the lower portion of the rear end face, opposite to the discharge port, of the discharge end supporting seat; the utility model discloses with the help of the double sealing effect of spiral bin gate and supporting seat bin gate, the heat that has effectively obstructed the interior heat of feed bin and mixed bituminous mixture passes through the discharge gate to external scattering and disappearing, and is sealed tight, and it is effectual to keep warm, and convenient operation easily overhauls simultaneously.

In the prior art, although an interlayer heat insulation mode is adopted, the interlayer only has slow heat loss, and if the transportation distance is long, the temperature of the hot-mix asphalt mixture is possibly reduced to be agglomerated, so that the agglomerated asphalt cannot be discharged after being cooled at a discharge port.

Disclosure of Invention

The utility model aims at the not enough of above-mentioned prior art, provide a sealed tight, convenient operation, good, the rational in infrastructure heat preservation discharge gate structure of heat preservation nature.

A heat preservation discharge port structure comprises a discharge box arranged on the wall of a bin and a bottom door movably arranged on the discharge box, wherein an opening is formed in the lower end of the discharge box, and the bottom door can seal the opening; the inner parts of the box walls of the bottom door and the discharge box are provided with heat-insulating layers; and the bottom door and the box wall of the discharge box are provided with heating devices which can heat the heat-insulating layer. This scheme is through setting up the heat preservation in bottom door and each tank wall of play workbin to the heating device that this heat preservation can carry out the heating is carried out in the setting, sets up the heat preservation on the one hand and carries out passive heat preservation, reduces thermal scattering and disappearing, and on the other hand can carry out the heating heat preservation of initiative to the heat preservation through heating device on passive heat retaining basis, prevents at the fortune material in-process, and the heat scatters and disappears to the external world through the discharge gate sooner, and the hot mix bituminous mixture leads to the condition of unable unloading in the cooling caking of discharge gate department.

Furthermore, the heating device is a heating oil pipe arranged on the inner side of each heat-insulating layer, and the heat-insulating layers can wrap the heating oil pipes; the heating oil pipes in the heat insulation layers are connected through oil delivery oil pipes and are connected with a heat conduction oil system, so that heat conduction oil can flow through the heat insulation layers in sequence. In order to save energy, the heat of the existing heat conduction oil system of the pavement maintenance truck is considered to heat the heat insulation layers under the condition that no additional heat source is added, specifically, the heating oil pipes of the heat conduction oil pipes are arranged in the heat insulation layers, and the oil delivery ends connected together are arranged outside the heat insulation layers. For the consideration of heating effect and reducing heat dissipation, the material of the heating oil pipe may be a material with better heat conductivity, such as metal, and the material of the oil conveying oil pipe may be a material with lower heat conductivity or smaller heat dissipation. The heat-insulating layer can cover the heating oil pipe, so that heat in the heating oil pipe can be fully transferred into the heat-insulating layer in the heating process.

Furthermore, the box walls of the bottom door and the discharge box are provided with heat-conducting oil joints, the outer ends of the heat-conducting oil joints can be connected with an oil feeding pipe, and the inner ends of the heat-conducting oil joints can be connected with a heating oil pipe. Heating oil pipe sets up inside the tank wall of bottom door and play workbin, and send the oil pipe setting outside the tank wall of bottom door and play workbin, in order to make the better connection together of sending oil pipe and heating oil pipe, set up the conduction oil joint on the tank wall of bottom door and play workbin, the conduction oil joint outer end can link to each other with sending the oil pipe, and the inner can link to each other with heating oil pipe, guarantees to send the compactness that oil pipe and heating oil union are connected.

Furthermore, the side wall of the discharging box comprises a discharging box inner plate and a cover plate, a sealed cavity is formed between the cover plate and the discharging box inner plate, and a heat insulation layer is filled in the cavity. Form sealed cavity through apron and play between the workbin inner panel to fill the heat preservation in the cavity, make the cavity play thermal-insulated heat retaining effect, the heat preservation that adopts in this scheme is the heat preservation cotton, has light in weight, anti-oxidant, the heat conductivity is low, the compliance is good, corrosion-resistant, the heat capacity is little and characteristics such as give sound insulation. Divide into ejection of compact case lateral wall and go out the workbin inner panel and apron, the ejection of compact inboard panel inner panel of each lateral wall couples together and constitutes a whole, and each apron then can install this whole, the installation of being convenient for.

Further, the bottom door comprises a main body and side plates on two sides of the main body, and the upper end parts of the side plates are hinged with the side walls of the discharging box, so that the bottom door can rotate around the hinged part. The two sides of the bottom door main body are provided with the side plates protruding upwards, the upper end parts of the two side plates are hinged with the side wall of the discharging box, and the bottom door can swing around a hinged shaft formed by two hinged points, so that the bottom door can rotate and block the opening of the feeding box.

Further, the bottom door main body is arc-shaped, and the circle center of the arc-shaped is located at the hinged position. In order to facilitate the rotation of the bottom door, the bottom door cannot be blocked by the side wall of the discharging box in the rotating process, the bottom door main body is arranged to be arc-shaped with the hinged part as the circle center, and the lower end face of the corresponding side wall is also arc-shaped, so that the bottom door can be well attached to the side wall of the discharging box in the opening or closing process.

Further, the bottom door main body includes a top plate and a bottom plate; the top plate and the bottom plate are buckled with each other, a sealed cavity is formed between the top plate and the bottom plate, and the cavity is filled with a heat insulation layer. The top plate and the bottom plate are buckled with each other to form a sealed cavity, the cavity is filled with the heat insulation layer, the cavity has the effects of heat insulation and heat preservation, and the buckled structure is convenient to manufacture.

Furthermore, a bin wall discharge port is formed in one side, connected with the bin wall, of the discharge box, and a material conveying mechanism capable of conveying materials into the discharge box is arranged on the opposite side. The discharge box is arranged on the wall of the storage bin, in order to enable the mixture in the storage bin to enter the discharge box, a discharge port of the wall of the storage bin is arranged on one side of the wall of the storage bin, and a material conveying mechanism capable of conveying the mixture into the discharge box is arranged on the opposite side of the wall of the storage bin, so that the mixture can enter the discharge box more easily during construction.

Further, the material conveying mechanism comprises a hydraulic motor and a spiral material conveying rod arranged on a rotating shaft of the hydraulic motor; the spiral conveying rod penetrates through a discharge hole in the bin wall, and the feeding end of the spiral conveying rod extends into the inner side of the bin. Through installing at the epaxial spiral delivery pole of hydraulic motor pivot to the feed end of spiral delivery pole stretches into the feed bin inboard, and hydraulic motor can drive spiral delivery pole and send the feed bin inboard with the interior misce bene of feed bin.

A pavement maintenance vehicle comprises the heat-insulation discharge hole structure.

The utility model discloses an above technical scheme, the inside heat preservation that is provided with of tank wall at bottom door and play workbin, be provided with heating oil pipe in the heat preservation, heating oil pipe between each part is through oil pipe and the heat conduction oil headtotail of road surface maintenance car, each intraformational heating oil pipe that keeps warm is in the same place through oil pipe and heat conduction oil headtotail, each heat preservation of flowing through in proper order is made the heat conduction oil, when road surface maintenance car is transporting hot mix bituminous mixture (HMA) and opens the heat conduction oil headtotail initiative heating, the heat conduction oil will carry out whole initiative heating to the discharge gate, realize the initiative and keep warm. The utility model discloses effectively the heat that has separated the interior hot mix bituminous mixture of feed bin passes through the discharge gate to external scattering and disappearing, prevents to appear the phenomenon that the hot mix bituminous mixture blocked in the cooling of discharge gate department, and is compact reasonable, and simple to operate has realized outstanding heat preservation effect under the condition that does not increase extra heat source.

Drawings

Fig. 1 is the assembly structure schematic diagram of the heat preservation discharge gate structure of the utility model.

Fig. 2 is the assembly structure schematic diagram 2 of the heat preservation discharge gate structure of the utility model.

Fig. 3 is a schematic view of the general assembly profile structure of the present invention.

Fig. 4 is a schematic view of the bottom door structure of the present invention 1.

Fig. 5 is a schematic view of the bottom door structure of the present invention 2.

Fig. 6 is a schematic view of the discharging box structure of the present invention.

Fig. 7 is an installation schematic diagram of the heating oil pipe on the upper cover plate of the present invention.

Fig. 8 shows the installation intention 1 of the heating oil pipe on the left cover plate of the present invention.

Fig. 9 is the schematic view of the installation of the heating oil pipe on the left cover plate of the present invention 2.

Fig. 10 is a schematic view of the installation of the heating oil pipe on the right cover plate of the present invention 1.

Fig. 11 is the installation schematic diagram 2 of the heating oil pipe on the right cover plate of the present invention.

In the figure: go out workbin 1, bottom door 5, oil pipe 6 feeds, upper cover plate 2a, upper cover heating oil pipe 2b, left side apron 3a, left side lid heating oil pipe 3b, right side apron 4a, right side lid heating oil pipe 4b, roof 5a, bottom plate 5b, curb plate 5c, bottom door heating oil pipe 5d, oil feed heat pipe 6a, left side lid oil outlet heat pipe 6b, bottom door oil outlet heat pipe 6c, right side lid oil return heat pipe 6d, oil outlet heat pipe 6e, conduction oil joint 7, feed bin 8, spiral material conveying rod 9, hydraulic motor 10, heat preservation 11.

Detailed Description

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents and other technical solutions without departing from the spirit and scope of the invention.

It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in a generic and descriptive sense only and not for purposes of limitation, as the terms are used in the description to indicate that the referenced device or assembly must have the specified orientation, be constructed and operated in the specified orientation, and not for the purposes of limitation.

It is to be understood that the terms "a" and "an" are to be interpreted as meaning "at least one" or "one or more," i.e., that in one embodiment, a number of an element can be one, and in another embodiment, a number of the element can be more than one, and the term "a" or "an" can be used "

And are not to be construed as limiting in number.

Example 1: a heat preservation discharge port structure comprises a discharge box 1 arranged on the wall of a bin and a bottom door 5 movably arranged on the discharge box, wherein an opening is formed in the lower end of the discharge box, and the bottom door 5 can seal the opening; the inner parts of the box walls of the bottom door and the discharge box are provided with heat-insulating layers; and the bottom door and the box wall of the discharge box are provided with heating devices which can heat the heat-insulating layer. This scheme is through setting up heat preservation 11 in bottom door and each tank wall of play workbin to the heating device that can heat is carried out for this heat preservation 11 in the setting, sets up the heat preservation on the one hand and carries out passive heat preservation, reduces thermal scattering and disappearing, and on the other hand can carry out the heating heat preservation of initiative to the heat preservation through heating device on passive heat retaining basis. Prevent to transport the material in-process, the heat is lost to the external world through the discharge gate faster, and the hot mix bituminous mixture cools off the condition that the caking leads to unable unloading in discharge gate department.

As shown in fig. 1-3, the discharging box 1 is installed on the wall of the storage bin 8 of the pavement maintenance truck, a wall discharging port is formed in one side of the discharging box 1, which is connected with the wall of the storage bin, a hydraulic motor installing port is formed in the opposite side of the discharging box, and a spiral conveying rod 9 in the storage bin penetrates through the wall discharging port and extends out of the end of the hydraulic motor 10 installed on the hydraulic motor installing port to be sleeved inside the discharging box. Go out the workbin setting on the feed bin bulkhead, in order to make the mixture in the feed bin get into out the workbin, it has the bulkhead discharge gate to open in the one side of feed bin bulkhead connection, is equipped with the fortune material mechanism that can transport the mixture into out the workbin on the relative one side lateral wall. Through installing hydraulic motor 10 on the relative one side lateral wall to and cup joint at epaxial spiral conveying pole 9 of changeing, the feed end of spiral conveying pole 9 stretches into the feed bin inboard, and hydraulic motor can drive spiral conveying pole and send the feed bin inboard with the interior misce bene of feed bin.

Each box wall of the discharging box comprises a discharging box inner plate 1a and a cover plate, a sealed cavity is formed between the cover plate and the discharging box inner plate, and a heat-insulating layer is filled in the cavity. In this embodiment, only be provided with cavity and heat preservation in the left and right, the three up tank wall of bottom door and ejection of compact case, each apron is upper cover plate 2a, left side apron 3a, right side apron 4a respectively. The upper cover plate 2a is a U-shaped bending plate, the front and the back of the short edges of the left side and the right side are respectively provided with a circular through hole, and the circular through holes are fixed at the top of the discharging box 1 in a welding mode; the left cover plate 3a is a U-shaped bending plate which is straight at the upper part and is circular at the lower part, three circular through holes are formed in the top of the long side of the U shape close to the straight side, and the three circular through holes are fixed on the left side of the discharging box 1 in a welding mode; the right cover plate 4a is a U-shaped bending plate with an upper straight circular arc and a lower circular arc, three circular through holes are formed in the top of the long edge of the U shape close to the straight edge, and the three circular through holes are fixed on the right side of the discharging box 1 in a welding mode.

The bottom door comprises a main body and side plates 5c on two sides of the main body, and the upper end parts of the side plates are hinged with the side wall of the discharging box, so that the bottom door can rotate around the hinged part. The bottom door main body comprises a top plate and a bottom plate; the top plate and the bottom plate are buckled with each other, a sealed cavity is formed between the top plate and the bottom plate, and the cavity is filled with a heat insulation layer. The bottom door main body is arc-shaped, and the circle center of the arc-shaped is positioned at the hinged position. In order to facilitate the rotation of the bottom door, the bottom door cannot be blocked by the side wall of the discharging box in the rotating process, the bottom door main body is arranged to be arc-shaped with the hinged part as the circle center, and the lower end face of the corresponding side wall is also arc-shaped, so that the bottom door can be well attached to the side wall of the discharging box in the opening or closing process.

As shown in fig. 4 and 5, the bottom door 5 is mainly composed of a top plate 5a, a bottom plate 5b, and side plates 5 c. The top plate 5a is an L-shaped sheet metal part with a radian of a long edge formed by bending a metal plate, and the radian of the long edge is matched with the radian of the bottom of the side plates 1a on the two sides of the discharging box 1. The bottom plate 5b is an L-shaped sheet metal part with a radian of a long edge formed by bending a metal plate, and the radian of the long edge is similar to that of the long edge of the top plate 5 a. The top plate 5a and the bottom plate 5b are fastened with each other to form a rectangular box body which is opened at the left and right sides and fixed by welding. The side plate 5c is a fan-shaped plate, the bottom arc is matched with the bottom plate 5b arc, and a circular through hole is respectively formed in the part, close to the front side, of the fan-shaped arc edge and the circle center of the fan-shaped arc edge. The side plates 5c are installed on the left and right sides of the rectangular box body formed by the top plate 5a and the bottom plate 5b, a closed cavity is formed with the side plates, and the cavity is filled with a heat insulation layer. The bottom door 5 passes through a through hole at the sector circle center part of the side plate 5c, penetrates through the cylinder 1b with the internal threaded hole of the discharge box 1, is suspended at the bottom of the discharge box 1, can rotate through the sector circle center position of the bottom door, and limits the axial position of the bottom door through a bolt arranged on the internal threaded hole.

As shown in fig. 1 to 11, the heating device is a heating oil pipe arranged inside each heat-insulating layer, and the heat-insulating layer can cover the heating oil pipe; the heating oil pipes in the heat insulation layers are connected through oil delivery oil pipes and are connected with a heat conduction oil system, so that heat conduction oil can flow through the heat insulation layers in sequence. The bottom door and the tank wall of the discharge tank are provided with heat conducting oil joints 7, the outer ends of the heat conducting oil joints 7 can be connected with an oil feeding pipe, and the inner ends can be welded with a heating oil pipe.

In this embodiment, each heating oil pipe is an upper cover heating oil pipe 2b, a left cover heating oil pipe 3b, a right cover heating oil pipe 4b, a bottom door heating oil pipe 5d, and the tail of each heating oil pipe is fixed on the corresponding cover plate or bottom door by welding a heat conducting oil joint 7. The upper cover heating oil pipe 2b is a multi-U-shaped serpentine coil pipe which is transversely connected, and the head end and the tail end of the upper cover heating oil pipe 2b respectively penetrate through the circular through hole of the upper cover plate 2a and are fixed by welding; the left cover heating oil pipe 3b is a multi-U-shaped snake-shaped coil pipe which is irregularly connected, and the head end and the tail end of the left cover heating oil pipe 3b respectively penetrate through two circular through holes of the left cover plate 3a and are fixed by welding; the right cover heating oil pipe 4b is a snake-shaped coil pipe which is connected in a U-shaped irregular manner, and the right cover heating oil pipe 4b respectively penetrates through two circular through holes of the right cover plate 4a and is fixed by welding; the bottom door heating oil pipe 5d is a transverse snake-shaped coil pipe formed by connecting a plurality of U-shaped pipes, the U-shaped straight edge part is bent into a circular arc shape corresponding to the radian of the bottom plate 5b, and the bottom door heating oil pipe 5d respectively penetrates through circular through holes near the bottom circular arcs of the side plates 5c, is placed in a closed cavity formed by the top plate 5a, the bottom plate 5b and the side plates 5c and is fixed by welding.

In this embodiment, the oil supply pipes connecting the heating oil pipes together are respectively: the oil inlet heat pipe 6a, the left cover oil outlet heat pipe 6b, the bottom door oil outlet heat pipe 6c, the right cover oil return heat pipe 6d and the oil outlet heat pipe 6 e. One end of the oil inlet heat pipe 6a is connected with an oil outlet joint of a heat conduction oil system led out from the bin wall, and the other end of the oil inlet heat pipe is connected with a heat conduction oil joint 7 at the head part of the upper cover heating oil pipe 2b of the left cover 3. One end of the left cover oil outlet pipe 6b is connected with the tail heat transfer oil joint 7 of the upper cover heating oil pipe 3b of the left cover 3, and the other end is connected with the head heat transfer oil joint 7 of the bottom door heating oil pipe 5 d. One end of the bottom door oil outlet heat pipe 6c is connected to the tail heat conduction oil joint 7 of the bottom door heating oil pipe 5d, and the other end of the bottom door oil outlet heat pipe is connected to the head heat conduction oil joint 7 of the right cover heating oil pipe 4 b. One end of the right cover oil return heat pipe 6d is connected to the tail heat transfer oil joint 7 of the right cover heating oil pipe 4b, and the other end is connected to the head heat transfer oil joint 7 of the upper cover heating oil pipe 2 b. One end of the oil outlet heat pipe 6e is connected with a heat conducting oil joint 7 at the tail part of the upper cover heating oil pipe 2b, and the other end is connected with an oil return joint of a heat conducting oil system connected out of the bin wall.

Example 2: the utility model provides a road surface maintenance car, includes the heat preservation discharge gate structure in embodiment 1.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the principles and spirit of the present invention.

Claims (10)

1. The utility model provides a heat preservation discharge gate structure which characterized in that: the device comprises a discharge box arranged on the wall of a bin and a bottom door movably arranged on the discharge box, wherein the lower end of the discharge box is provided with an opening, and the bottom door can seal the opening; the inner parts of the box walls of the bottom door and the discharge box are provided with heat-insulating layers; and the bottom door and the box wall of the discharge box are provided with heating devices which can heat the heat-insulating layer.

2. The heat-preservation discharge hole structure of claim 1, characterized in that: the heating device is a heating oil pipe arranged on the inner side of each heat-insulating layer, and the heat-insulating layers can wrap the heating oil pipes; the heating oil pipes in the heat insulation layers are connected through oil delivery oil pipes and are connected with a heat conduction oil system, so that heat conduction oil can flow through the heat insulation layers in sequence.

3. The heat-preservation discharge hole structure of claim 2, characterized in that: the bottom door and the tank wall of the discharge tank are provided with heat conducting oil joints, the outer ends of the heat conducting oil joints can be connected with an oil feeding pipe, and the inner ends of the heat conducting oil joints can be connected with a heating oil pipe.

4. The heat-preservation discharge hole structure of claim 1, characterized in that: the discharge box wall comprises a discharge box inner plate and a cover plate, a sealed cavity is formed between the cover plate and the discharge box inner plate, and a heat insulation layer is filled in the cavity.

5. The heat-preservation discharge hole structure of claim 1, characterized in that: the bottom door comprises a bottom door main body and side plates on two sides of the bottom door main body, and the upper end parts of the two side plates are respectively hinged with two side walls of the discharging box, so that the bottom door can rotate around the hinged part.

6. A heat preservation discharge gate structure of claim 5, characterized in that: the bottom door main body is arc-shaped, and the circle center of the arc-shaped is positioned at the hinged position.

7. The heat-preservation discharge hole structure of claim 2, characterized in that: the bottom door main body comprises a top plate and a bottom plate; the top plate and the bottom plate are buckled with each other, a sealed cavity is formed between the top plate and the bottom plate, and the cavity is filled with a heat insulation layer.

8. The heat-preservation discharge hole structure of claim 1, characterized in that: the side wall of the discharge box connected with the bin wall of the storage bin is provided with a bin wall discharge port, and the opposite side wall is provided with a material conveying mechanism capable of conveying materials into the discharge box.

9. The heat-preservation discharge hole structure of claim 8, characterized in that: the material conveying mechanism comprises a hydraulic motor and a spiral material conveying rod sleeved on a rotating shaft of the hydraulic motor; the spiral conveying rod penetrates through a discharge hole in the bin wall, and the feeding end of the spiral conveying rod extends into the inner side of the bin.

10. A pavement maintenance vehicle, characterized by comprising the heat-insulating discharge port structure of any one of claims 1 to 9.

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