A conveying system for an asphalt mixture heat-preservation transport vehicle

Abstract

This invention discloses a material conveying system for asphalt mixture insulated transport vehicles in the field of road transport equipment technology. It aims to solve problems in existing belt conveyor technology, such as the tendency for rubber belts to trap and adhere asphalt, leading to road contamination and damage to the tractor's electrical wiring, as well as belt overheating and wear due to material aging. The system includes a hopper, a conveying device, a tractor power unit, a hydraulic power transmission device, and a vehicle electronic control unit. The conveying device is connected to the tractor power unit via the hydraulic power transmission device, enabling the tractor power unit to drive the conveying device to transport the material from the hopper to the discharge port at the rear of the hopper. The vehicle electronic control unit controls the start and stop of material conveying by controlling the start and stop of the conveying device, the tractor power unit, and / or the hydraulic power transmission device. This invention features a well-insulated hopper, horizontal unloading during conveying, and is suitable for various unloading applications such as bridges and culverts.

Description

Technical Field

[0001] This invention relates to a material conveying system for an insulated transport vehicle of asphalt mixture, belonging to the technical field of road transport equipment. Background Technology

[0002] Currently, most road engineering companies use 8x4 dump trucks to transport hot asphalt mixtures. These dump trucks commonly encounter the following problems during the asphalt transfer process:

[0003] First, the insulation effect is poor. Dump trucks are not equipped with insulation layers when they leave the factory. When transporting hot asphalt mixture, individuals add insulation measures such as cotton quilts to the vehicles. During long-distance transportation in low-temperature environments, the heat loss of hot asphalt mixture is extremely large. In addition, after being transported to the construction site, there is still a certain amount of time before unloading, which will cause temperature segregation of the asphalt material used for construction.

[0004] Secondly, dump trucks cannot dump materials in construction sites such as bridges and culverts. When transporting materials to pavers, dump trucks need to lift the hopper to transport materials, which is impossible in height-restricted areas such as bridges and culverts. Furthermore, docking with a construction paver can easily damage the paver's hopper. When dump trucks dock with pavers to transport materials, the driver cannot fully observe the situation behind in the cab, which can cause the hopper to be lifted too high and smash the paver's hopper.

[0005] Then, during the unloading process with the paver, the unloading volume becomes uncontrollable, resulting in overflow or insufficient material supply in the paver's hopper. When the paver's hopper overflows, in severe cases, the asphalt mixture may enter the paver's tracks and break the chains. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a material conveying system for asphalt mixture heat-insulated transport vehicles. It is convenient for unloading, avoids the need to lift the hopper for unloading, and has a good heat insulation effect, which can effectively prevent the material from segregating due to low temperature. It can also achieve continuous paving by the paver through an electronic control device, avoiding the phenomenon of material overflow in the paver hopper or insufficient material supply.

[0007] To achieve the above objectives, the present invention employs the following technical solution: a material conveying system for an asphalt mixture insulation transport vehicle, comprising a hopper, a material conveying device, a tractor power unit, a hydraulic power transmission device, and a vehicle electronic control device. The material conveying device is connected to the tractor power unit via the hydraulic power transmission device, enabling the tractor power unit to drive the material conveying device to transport the material in the hopper to the discharge port at the rear of the hopper. The vehicle electronic control device controls the start and stop of material conveying by controlling the start and stop of the material conveying device, the tractor power unit, and / or the hydraulic power transmission device.

[0008] Optionally, the tractor power unit includes a tractor engine, a gearbox, and a power take-off (PTO). The tractor engine is connected to the gearbox, and the PTO is connected to the power output port of the gearbox. The tractor power unit is also equipped with a PTO electronic control device for controlling the start and stop of the PTO and switching the tractor power output to the PTO.

[0009] Optionally, the hydraulic power unit includes a hydraulic oil tank, a hydraulic pump, a hydraulic pipeline assembly, a hydraulic proportional valve, a hydraulic motor, and a hydraulic cylinder. The power input end of the hydraulic pump is connected to the power output end of the power take-off, and the power take-off can transmit the power of the tractor to the hydraulic pump.

[0010] The hydraulic pipeline assembly includes an inlet pipe and an outlet pipe. The inlet of the hydraulic pump is connected to the hydraulic oil tank through the inlet pipe, and the outlet is connected to the inlet of the hydraulic proportional valve through the outlet pipe. The outlet of the hydraulic proportional valve is connected to the hydraulic motor and each cylinder through pipelines.

[0011] Optionally, the bottom of the hopper is provided with a frame, and the conveying device is mounted on the frame. It includes a drive shaft assembly and a driven shaft assembly, which are respectively installed at both ends of the frame. The drive and driven shafts are provided with sprockets symmetrical about the center of the frame on both sides inside the frame. Chains in the front-to-back direction are fitted on the sprockets. Multiple scrapers for conveying materials are provided between the chains. The scrapers are in contact with the bottom plate of the hopper. The end of the drive shaft located outside the frame is also connected to a hydraulic motor.

[0012] Optionally, it also includes a tensioning screw for adjusting the chain tension, the tensioning screw being located on both sides of the frame and passing through a screw hole on the side of the frame.

[0013] Optionally, a lubricating oil can for chain lubrication and maintenance is also provided on one side of the hopper.

[0014] Optionally, the hopper includes a hopper body, a top cover, and a material door. The inner wall of the hopper body is provided with a heat-insulating layer, and the opening and closing parts of the top cover and the material door are provided with rubber seals for airtight heat insulation.

[0015] Optionally, the cross-section of the silo is a trapezoidal structure that is wider at the top and narrower at the bottom.

[0016] Optionally, the electronic control device is located at the rear end of the hopper and includes a remote controller, a receiver, a detection unit, and several control valves. The signal input terminal of the receiver can receive remote controller commands via wireless communication signals, and the signal output terminal is connected to the detection unit and the control valves. The control valves include a material gate control valve, a top cover control valve, and a hydraulic motor speed control proportional valve. The hydraulic motor speed control proportional valve is used to control the speed of the hydraulic motor.

[0017] Optionally, the detection unit includes a travel distance detection unit for calculating the travel distance of the tractor and a scraper conveying distance detection unit for calculating the scraper movement distance. The travel distance detection unit is located on the tractor tire, and the scraper conveying distance detection unit is located at the output end of the hydraulic motor.

[0018] Optionally, the remote control includes a touch screen display and several control buttons. The touch screen display is used to set the paving speed and paving thickness, and the control buttons are respectively used to control various control valves.

[0019] The present invention also provides a method for unloading control of an electronic control device for a conveying system of an asphalt mixture insulation transport vehicle, comprising the following steps:

[0020] S1. Obtain target reference values ​​for paving width w and paving thickness δ;

[0021] S2. After receiving the unloading start command, recommend a hydraulic motor starting speed N0 based on the paving width w and paving thickness δ.

[0022] S3. Receive the pulse signal sent by the driving distance detection unit, and compare the actual number of pulse signals n2 read from the scraper conveying distance detection unit with the theoretical number of pulse signals n0 from the scraper conveying distance detection unit. n0 is calculated by the formula n0=P2 *w*δ*3.14*d1*n1 / (P1*S*L0).

[0023] By performing real-time PID adjustment on the hydraulic motor speed control proportional valve, the speed of the hydraulic motor is controlled so that n2 and n0 are consistent.

[0024] S4. Upon receiving the unloading instruction indicating the end of unloading, the hydraulic motor stops running, and the construction is completed.

[0025] Furthermore, n0 in step S3 is obtained from the following steps:

[0026] S1. According to the preset scanning period t, the number of pulse signals emitted by the travel distance detection unit in a single scanning period is n1, and the travel distance of the transport vehicle in one scanning period t can be calculated:

[0027] L1 = 3.14 * d1 * (n1 / P1);

[0028] Where d1 is the tire diameter and P1 is the resolution of the photoelectric encoder of the driving distance detection unit;

[0029] S2. Based on the paving width w, paving thickness δ, and travel distance L1, the paving volume of the paver within a single scanning cycle t can be calculated:

[0030] Q1=w*δ*L1= w*δ*3.14*d1*(n1 / P1);

[0031] S3. Preset that the hydraulic motor operates at a constant speed N within a single scanning cycle t, and calculate the material feeding amount within a single scanning cycle t as follows:

[0032] Q2=N*t*L0*S;

[0033] Where L0 is the distance the scraper travels when the hydraulic motor rotates one revolution, and S is the area of ​​the discharge port of the tractor.

[0034] S4. The amount of asphalt mixture Q1 delivered by the tractor to the paver within a single scanning cycle t is equal to the amount of asphalt mixture Q2 laid by the paver. Calculations show that:

[0035] Q2=N*t*L0*S=Q1= w*δ*3.14*d1*(n1 / P1);

[0036] S5. Combining the formula N = n0 / (t* P2), where P2 is the resolution of the photoelectric encoder of the scraper conveying distance detection unit, we can calculate n0 = P2 *w*δ*3.14*d1*n1 / (P1*S*L0).

[0037] Furthermore, in step S3, the chain speed can be fine-tuned to adjust the material conveying speed.

[0038] The present invention also provides an asphalt mixture insulated transport vehicle, including the material conveying system for the asphalt mixture insulated transport vehicle described in any of the above claims.

[0039] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0040] This invention uses a scraper to gradually scrape away the material collected at the bottom of the silo, making it easier to transport out through the material gate. This avoids the traditional method of lifting the silo for unloading, and is suitable for more unloading occasions, such as height-restricted occasions like bridges and culverts.

[0041] This invention controls the unloading amount through an electronic control device, avoiding the phenomenon of material overflow or insufficient material supply in the paver hopper, which helps the paver to pave continuously, saves manpower, and realizes unmanned cluster construction.

[0042] The inner wall of the hopper of this invention is provided with a heat-insulating layer, which can keep the stored materials warm. Together with the rubber seals at the opening and closing of the top cover and the material door, it plays a sealing role and further improves the heat preservation effect. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the external structure of an asphalt mixture insulated transport vehicle in one embodiment of the present invention;

[0044] Figure 2 This is a schematic diagram of the external structure of the hopper of the material conveying system for an asphalt mixture insulated transport vehicle in one embodiment of the present invention;

[0045] Figure 3 This is a schematic diagram of the internal structure of the hopper of the material conveying system for an asphalt mixture insulated transport vehicle in one embodiment of the present invention;

[0046] Figure 4 This is a schematic diagram of the frame structure of the material conveying system for an asphalt mixture insulation transport vehicle in one embodiment of the present invention;

[0047] Figure 5 This is a schematic diagram of the active part of the material conveying system for an asphalt mixture insulation transport vehicle in one embodiment of the present invention;

[0048] Figure 6 This is a schematic diagram of the driven part of the material conveying system for an asphalt mixture insulation transport vehicle in one embodiment of the present invention;

[0049] Figure 7 This is a schematic diagram of the tractor power unit of the material conveying system for an asphalt mixture insulation transport vehicle in one embodiment of the present invention;

[0050] Figure 8 This is a schematic diagram of the hydraulic power transmission device of the material conveying system for an asphalt mixture insulation transport vehicle in one embodiment of the present invention;

[0051] Figure 9 A top view of the remote control for the material conveying system of an asphalt mixture thermal insulation transport vehicle in one embodiment of the present invention;

[0052] Figure 10 This is a schematic diagram of the electrical control device of the material conveying system for an asphalt mixture insulation transport vehicle in one embodiment of the present invention;

[0053] In the picture:

[0054] 1 rack,

[0055] 2. Material bin, 201. Material bin wall, 202. Top cover, 203. Material gate.

[0056] 3. Conveying device, 301. Drive shaft, 302. Hydraulic motor, 303. Driven shaft, 304. Chain, 305. Scraper, 306. Tensioning screw, 307. Sprocket.

[0057] 4. Tractor power unit, 41. Tractor engine, 42. Gearbox, 43. Power take-off unit,

[0058] 5. Electronic control device; 51. Remote control; 511. Touch screen display; 512. Control button; 52. Receiver; 53. Detection unit; 531. Travel distance detection unit; 532. Scraper conveyor distance detection unit; 54. Control valve.

[0059] 6. Hydraulic power transmission device; 61. Hydraulic oil tank; 62. Hydraulic pump; 63. Hydraulic pipeline assembly; 64. Hydraulic proportional valve; 65. Top cover opening and closing cylinder; 66. Material gate opening and closing cylinder.

[0060] 7. Lubricating oil reservoir, 8. Rubber seal, 9. Insulation jacket. Detailed Implementation

[0061] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0062] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0063] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0064] Example 1:

[0065] like Figure 1 As shown, the asphalt mixture insulation transport vehicle material conveying system provided in this embodiment of the invention includes: a hopper 2, a material conveying device 3, a tractor power unit 4, a hydraulic power transmission device 5, and a vehicle electronic control device 6. The material conveying device 3 is connected to the tractor power unit 4 through the hydraulic power transmission device 5, enabling the tractor power unit 4 to drive the material conveying device 3 to transport the material in the hopper 2 to a designated location. The vehicle electronic control device 6 controls the start and stop of material conveying by controlling the start and stop of the material conveying device 3, the tractor power unit 4, and / or the hydraulic power transmission device 5.

[0066] The hopper 2 has a trapezoidal cross-section, wider at the top and narrower at the bottom. The hopper 2 is welded to the top of the frame 1. The hopper 2 includes a hopper wall 201, a top cover 202, and a material gate 203. The top cover 202 is equipped with a top cover opening / closing cylinder 65 for driving the opening and closing of the top cover 202. The material gate 203 is located at the rear of the hopper wall 201 and is equipped with a material gate opening / closing cylinder 66 for driving the opening and closing of the material gate 203.

[0067] Combination Figure 8 The tractor power unit 4 includes a tractor engine 41, a gearbox 42, and a power take-off (PTO) 43. The tractor engine 41 is connected to the gearbox 42, and the PTO 43 is connected to the power output port of the gearbox 42. The PTO 43 is also equipped with a PTO electronic control device for controlling the start and stop of the PTO 43 and switching the tractor power to the PTO 43. The electronic control device includes an electrical wiring assembly, a solenoid valve, and a PTO 43 switch button located in the tractor cab. Pressing the button will switch the tractor power output to the PTO 43.

[0068] Combination Figure 9 The hydraulic power unit 6 includes a hydraulic oil tank 61, a hydraulic pump 62, and a hydraulic pipeline assembly 63. The power input end of the hydraulic pump 63 is connected to the power output end of the power take-off (PTO) 43, which transmits power from the tractor to the hydraulic pump 62. The hydraulic pipeline assembly 63 includes an inlet pipe and an outlet pipe. The inlet of the hydraulic pump 62 is connected to the hydraulic oil tank 61 via the inlet pipe, and the outlet is connected to the inlet of the hydraulic proportional valve via the outlet pipe. The outlet of the hydraulic proportional valve is connected to the hydraulic motor 302, the cover opening / closing cylinder 65, and the material gate opening / closing cylinder 66 via pipelines. A switch valve is provided at the connection between the inlet pipe and the hydraulic oil tank 61 to control the on / off state of the hydraulic oil circuit.

[0069] When the gearbox 42 outputs power, the power is transmitted to the hydraulic pump 62 through the power take-off unit 43. The hydraulic pump 62 transmits the hydraulic fluid power to the hydraulic motor 302, the upper cover opening and closing cylinder 65 and the material gate opening and closing cylinder 66 through the hydraulic proportional valve, respectively, to provide the corresponding power.

[0070] like Figure 10 As shown, the electronic control device 5 is located at the end of the hopper 2. It includes a remote controller 51, a receiver 52, a detection unit 53, and several control valves 54. The detection unit 52 includes a travel distance detection unit 531 for calculating the travel distance of the tractor and a scraper conveying distance detection unit 532 for calculating the scraper movement distance. The travel distance detection unit 531 is located on the tractor tire, and the scraper conveying distance detection unit 532 is located at the output end of the hydraulic motor 302 and rotates together with the hydraulic motor 302.

[0071] The signal input terminal of receiver 52 is connected to remote controller 51, and the signal output terminal is connected to detection unit 53 and control valve. Control valve 54 includes a material gate control valve, a top cover control valve, and a hydraulic motor speed control proportional valve. The hydraulic motor speed control proportional valve is used to control the speed of the hydraulic motor. Figure 10 As shown, the remote control 51 includes a touch screen display 511 and several control buttons 512. The touch screen display 511 is used to set the paving speed and paving thickness, and the control buttons 512 are respectively used to control each control valve 54.

[0072] Example 2:

[0073] like Figure 2-4 As shown, the conveying device 3 of the asphalt mixture insulation transport vehicle conveying system provided in this embodiment of the invention is located at the bottom of the silo 2, and can transport the material in the silo 2 to the outside through the material gate 203.

[0074] like Figure 5-6 As shown, the material conveying device 3 includes a drive shaft 301 and a driven shaft 303, which are respectively installed at both ends of the frame 1. Sprockets 307 are splined to both sides of the middle section of the frame 1. Chains 304 are fitted onto the sprockets 307, and multiple scrapers 305 for material transport are provided between the chains 304. The scrapers 305 contact the bottom wall of the hopper 2, thereby transporting the material in the hopper 2 towards the material gate 203. A lubricating oil can 7 is also provided on one side of the hopper 2. The lubricating oil can 7 can drip lubricating oil from the can onto the chain 304 through an oil pipe for lubrication and maintenance.

[0075] One end of the drive shaft 301 located on the outside of the frame 1 is also connected to the hydraulic motor 302. The hydraulic motor 302 can drive the drive shaft 301 and its sprocket 308 to rotate, thereby driving the driven shaft 303 to rotate synchronously through the chain 304, causing the scraper 305 to move forward and continuously push the material in the hopper 2 toward the material gate 203.

[0076] Example 3:

[0077] Based on Example 2, the asphalt mixture insulated transport vehicle conveying system also includes tension screws 306. These tension screws 306 are located on both sides of the frame 1 and pass through screw holes on the outer side of the frame 1, allowing adjustment of the tension of the chains 304 on both sides. An insulation layer 9, composed of insulation cotton, is provided on the inner wall of the hopper 2. The insulation cotton is fixed to the inner wall of the hopper with wire, providing all-around insulation for the hopper 2. Both the top cover 202 and the material gate 203 have rubber seals 8 for airtight insulation at their opening and closing points; the combination of these two elements enhances the insulation effect of the hopper 2.

[0078] Example 4:

[0079] The present invention also provides a method for unloading control of an electronic control device for a conveying system of an asphalt mixture insulation transport vehicle, comprising the following steps:

[0080] S1. Obtain target reference values ​​for paving width w and paving thickness δ;

[0081] S2. After receiving the unloading start command, recommend a hydraulic motor starting speed N0 based on the paving width w and paving thickness δ.

[0082] S3. Receive the pulse signal sent by the driving distance detection unit, and compare the actual number of pulse signals n2 read from the scraper conveying distance detection unit with the theoretical number of pulse signals n0 from the scraper conveying distance detection unit. n0 is calculated by the formula n0=P2 *w*δ*3.14*d1*n1 / (P1*S*L0).

[0083] By performing real-time PID adjustment on the hydraulic motor speed control proportional valve, the speed of the hydraulic motor is controlled so that n2 and n0 are consistent.

[0084] S4. Upon receiving the unloading instruction indicating the end of unloading, the hydraulic motor stops running, and the construction is completed.

[0085] Wherein, n0 is obtained by the following steps:

[0086] S1. According to the preset scanning period t, the number of pulse signals emitted by the travel distance detection unit in a single scanning period is n1, and the travel distance of the transport vehicle in one scanning period t can be calculated:

[0087] L1 = 3.14 * d1 * (n1 / P1);

[0088] Where d1 is the tire diameter and P1 is the resolution of the photoelectric encoder of the driving distance detection unit;

[0089] S2. Based on the paving width w, paving thickness δ, and travel distance L1, the paving volume of the paver within a single scanning cycle t can be calculated:

[0090] Q1=w*δ*L1= w*δ*3.14*d1*(n1 / P1);

[0091] S3. Preset that the hydraulic motor operates at a constant speed N within a single scanning cycle t, and calculate the material feeding amount within a single scanning cycle t as follows:

[0092] Q2=N*t*L0*S;

[0093] Where L0 is the distance the scraper travels when the hydraulic motor rotates one revolution, and S is the area of ​​the discharge port of the tractor.

[0094] S4. The amount of asphalt mixture Q1 delivered by the tractor to the paver within a single scanning cycle t is equal to the amount of asphalt mixture Q2 laid by the paver. Calculations show that:

[0095] Q2=N*t*L0*S=Q1= w*δ*3.14*d1*(n1 / P1);

[0096] S5. Combining the formula N = n0 / (t* P2), where P2 is the resolution of the photoelectric encoder of the scraper conveying distance detection unit, we can calculate n0 = P2 *w*δ*3.14*d1*n1 / (P1*S*L0).

[0097] Example 5:

[0098] The present invention also provides an asphalt mixture insulated transport vehicle, including the above-mentioned asphalt mixture insulated transport vehicle material conveying system.

[0099] The working principle of this invention is as follows: the tractor is parked below the material so that the material outlet can be aligned with the middle of the upper cover 202. Then, the control button 512 is pressed to start the upper cover opening and closing cylinder 65. The upper cover opening and closing cylinder 65 drives the linkage mechanism to drive the upper cover 202 to open from the middle to both sides to collect the material to be transported.

[0100] After transportation to the designated location, the material gate 203 is connected to the paver to facilitate material feeding into the paver's hopper. The power take-off 43 switches the tractor's power to the material gate opening and closing cylinder 66, which opens the material gate 203. Then, the hydraulic motor 302 is started, driving the drive shaft 301 to rotate. The drive shaft 301 drives the chain 304 via the sprocket 307, which in turn drives the driven shaft 303 to rotate. At this time, multiple scrapers 305 on the chain 304 gradually push the material at the bottom of the hopper 2 towards the material gate 203, ensuring the cleanliness of the hopper 2 and avoiding waste.

[0101] All of the above operations can be completed by staff using remote control 51, saving manpower and making operation convenient.

[0102] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A material conveying system for an asphalt mixture insulated transport vehicle, characterized in that: This includes the hopper, conveying device, tractor power unit, hydraulic power transmission device, and vehicle electronic control unit; among which... The tractor power unit includes a tractor engine, a gearbox, and a power take-off (PTO). The tractor engine is connected to the gearbox below. The PTO is also equipped with a PTO electronic control device for controlling the start and stop of the PTO and switching the tractor power to the PTO. The PTO is located at the power output port of the gearbox. The material conveying device is connected to the tractor power unit via a hydraulic power transmission device, enabling the tractor power unit to drive the material conveying device to transport the material in the hopper to a designated location. The vehicle electronic control device controls the start and stop of material conveying by controlling the start and stop of the material conveying device, the tractor power unit and / or the hydraulic power transmission device. The hydraulic power transmission device includes a hydraulic oil tank, a hydraulic pump, and a hydraulic pipeline assembly. The power input end of the hydraulic pump is connected to a power take-off (PTO), and the PTO can switch the power of the tractor to the hydraulic pump. The hydraulic piping assembly includes an inlet pipe and an outlet pipe. The inlet of the hydraulic pump is connected to the hydraulic oil tank via the inlet pipe, and the outlet is connected to the inlet of the hydraulic proportional valve via the outlet pipe. The outlet of the hydraulic proportional valve is connected to the hydraulic motor, the upper cover opening / closing cylinder, and the material gate opening / closing cylinder via piping. When the gearbox outputs power, the power is transmitted to the hydraulic pump through the power take-off unit. The hydraulic pump then transmits the hydraulic fluid power through the hydraulic proportional valve to the hydraulic motor, the upper cover opening and closing cylinder, and the material gate opening and closing cylinder, respectively, to provide the corresponding power.

2. The material conveying system for an asphalt mixture heat-insulated transport vehicle according to claim 1, characterized in that: The material conveying device includes a drive shaft and a driven shaft, which are respectively installed at both ends of the frame. Both sides inside the frame are provided with sprockets, and chains are fitted on the sprockets. Multiple scrapers for conveying materials are provided between the chains. The scrapers are in contact with the bottom wall of the hopper. The end of the drive shaft located outside the frame is also connected to a hydraulic motor.

3. The asphalt mixture heat-preservation transport vehicle conveying system according to claim 2, characterized in that: It also includes tension screws for adjusting the chain tension, the tension screws being located on both sides of the frame and passing through screw holes on the side of the frame.

4. The material conveying system for a hot mix asphalt transport vehicle of claim 1, wherein: A lubricating oil can for chain lubrication and maintenance is also provided on one side of the hopper.

5. The material conveying system for a hot mix asphalt transport vehicle of claim 1, wherein: The inner wall of the hopper is provided with an insulation layer, and the opening and closing parts of the top cover and the material door are provided with rubber seals for sealing and insulation.

6. The material conveying system for an asphalt mixture thermal transport vehicle of claim 5, wherein: The silo has a trapezoidal cross-section that is wider at the top and narrower at the bottom.

7. The material conveying system for an asphalt mixture heat-insulated transport vehicle according to claim 2, characterized in that: The electronic control device is located at the end of the hopper and includes a remote controller, a receiver, a detection unit, and several control valves. The signal input terminal of the receiver is connected to the remote controller, and the signal output terminal is connected to the detection unit and the control valves. The control valves include a material gate control valve, a top cover control valve, and a hydraulic motor speed control proportional valve. The hydraulic motor speed control proportional valve is used to control the speed of the hydraulic motor.

8. The material conveying system for an asphalt mixture thermal transport vehicle of claim 7, wherein: The detection unit includes a travel distance detection unit for calculating the travel distance of the tractor and a scraper conveying distance detection unit for calculating the scraper movement distance. The travel distance detection unit is located on the tractor tire, and the scraper conveying distance detection unit is located at the output end of the hydraulic motor.

9. The material conveying system for an asphalt mixture heated transport vehicle of claim 7, wherein: The remote control includes a touch screen display and several control buttons. The touch screen display is used to set the paving width and paving thickness, and the control buttons are respectively used to control various control valves.

10. A method for unloading control based on the electrical control device of the conveying system for an asphalt mixture insulated transport vehicle as described in claim 8, characterized in that: S1. Obtain target reference values ​​for paving width w and paving thickness δ; S2. After receiving the unloading start command, recommend a hydraulic motor starting speed N0 based on the paving width w and paving thickness δ. S3. Upon receiving the pulse signal from the travel distance detection unit, compare the actual number of pulse signals n2 read from the scraper conveying distance detection unit with the theoretical number of pulse signals n0 from the scraper conveying distance detection unit. n0 is calculated using the formula n0=P2 * w*δ*3 .14*d1 *n1 / (P1 *S*L0 ) Where n1 is the number of pulse signals emitted by the travel distance detection unit in a single scanning cycle, d1 is the tire diameter, P1 is the resolution of the photoelectric encoder of the travel distance detection unit, L0 is the travel distance of the scraper when the hydraulic motor rotates once, S is the area of ​​the tractor's discharge port, and P2 is the resolution of the photoelectric encoder of the scraper conveying distance detection unit. By performing real-time PID regulation on the hydraulic proportional valve, the speed of the hydraulic motor is controlled to make n2 and n0 consistent. S4. Upon receiving the unloading instruction indicating the end of unloading, the hydraulic motor stops running, and the construction is completed.

11. The unloading control method of the electronic control device for the material conveying system according to claim 10, characterized in that: In step S3, n0 is obtained from the following steps: S31. According to the preset scanning period t, the number of pulse signals emitted by the travel distance detection unit in a single scanning period is n1, and the travel distance of the transport vehicle in one scanning period t can be calculated: L1 = 3.14 * d1 * (n1 / P1); S32. Based on the paving width w, paving thickness δ, and travel distance L1, the paving amount of the paver within a single scanning cycle t can be calculated: Q1=w*δ*L1 = w*δ*3.14*d1*(n1 / P1); S33. Preset that the hydraulic motor operates at a constant speed N within a single scanning cycle t, and calculate the material conveying amount within a single scanning cycle t as: Q2 = N*t*L0*S; S34. The amount of asphalt mixture Q1 delivered by the tractor to the paver within a single scanning cycle t is equal to the amount of asphalt mixture Q2 laid by the paver. Calculations show that: Q2 =N*t*L0 *S=Q1 = w*δ*3 .14*d1 *(n1 / P1 ); S35. Combining the formula N = n0 / (t * P2), we can calculate n0 = P2 * w * δ * 3.14 * d1 * n1 / (P1 * S * L0).

12. The unloading control method of the electronic control device for the material conveying system according to claim 10, characterized in that: In step S3, the chain speed can also be fine-tuned to adjust the material conveying speed.

13. An asphalt mixture insulated transport vehicle characterized by: The asphalt mixture insulated transport vehicle conveying system according to any one of claims 1-9.

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