CN111794070A - In-place heat regeneration heating temperature control system and control method - Google Patents
In-place heat regeneration heating temperature control system and control method Download PDFInfo
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- CN111794070A CN111794070A CN202010666817.8A CN202010666817A CN111794070A CN 111794070 A CN111794070 A CN 111794070A CN 202010666817 A CN202010666817 A CN 202010666817A CN 111794070 A CN111794070 A CN 111794070A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/14—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces for heating or drying foundation, paving, or materials thereon, e.g. paint
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
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Abstract
The invention relates to a local heat regeneration heating temperature control system and a control method, wherein the local heat regeneration heating temperature control system comprises: the heating device comprises a control module, a first data acquisition module, a second data acquisition module and a heating device; the first data acquisition module is suitable for acquiring pavement heating data in real time; the second data acquisition module is suitable for acquiring the heating temperature of the heating device in real time; the control module is suitable for obtaining the temperature of a heat source to be heated and controlling the heating device to heat the road surface; the control module is suitable for comparing the temperature of a heat source to be heated with the heating temperature acquired in real time so as to control the heating device to adjust the heating temperature of the road surface in real time; according to the invention, the heating data of the road surface and the preset heating temperature required by the road surface are collected to obtain the temperature of the heat source required to be heated, and the heating temperature is automatically adjusted by the heating device by comparing the temperature of the heat source with the heating temperature, so that the quality and the efficiency of the road surface heating construction are improved.
Description
Technical Field
The invention relates to the technical field of asphalt pavement hot in-place recycling construction, in particular to a hot in-place recycling heating temperature control system and a control method.
Background
The existing heat regeneration equipment usually collects the temperature of the heated road surface through manpower when the original road surface is heated, and then feeds back the temperature to the road surface by adjusting the gears of the heating device for the mechanical operator of the heat regeneration heating machine, even the temperature difference between the control gears of the heating device is very large, and the temperature for heating the road surface fluctuates in a large range. In order to enable the road surface temperature to reach the heating temperature requirement, in the thermal regeneration construction process, a high-temperature gear is generally selected to continuously heat the road surface, adjustment cannot be performed according to the road surface heating condition, the road surface temperature is manually acquired intermittently and subjectively, even if the road surface is heated too high, the adjustment of the heat source temperature of the heating device is informed after problems are found, and the adjustment delay exists. The existing heat regeneration equipment has large fluctuation of the heating temperature of the road surface or uneven heating, and the automation control degree is low, thereby affecting the efficiency and the quality of the road surface heating and the incomplete road surface heating.
Disclosure of Invention
The invention aims to provide a local heat regeneration heating temperature control system and a control method.
In order to solve the above technical problem, the present invention provides a local heat regeneration heating temperature control system, including: the heating device comprises a control module, a first data acquisition module, a second data acquisition module and a heating device; the first data acquisition module is suitable for acquiring pavement heating data in real time and sending the pavement heating data to the control module; the second data acquisition module is suitable for acquiring the heating temperature of the heating device in real time and sending the heating temperature to the control module; the control module is suitable for obtaining the heat source temperature required to be heated according to the preset road surface required heating temperature and road surface heating data, and controlling the heating device to heat the road surface according to the heat source temperature required to be heated; and the control module is suitable for comparing the temperature of the heat source to be heated with the heating temperature acquired in real time and controlling the heating device to adjust the heating temperature of the road surface in real time according to the comparison result.
Further, the heating time T required for heating the road surface to be heated to the preset road surface heating temperature by the heating device is set, and the heating time T is related to the road surface thickness H of the road surface to be heated, namely
Wherein: l is the length of the heating device; v is the running speed of the heating device; k is the heat conductivity coefficient of the asphalt mixture; alpha is the density of the asphalt mixture;
it follows that the heating time T can be adjusted by the driving speed V of the heating device, i.e. according to equation 1:
the road surface heating data includes: the pavement temperature, the environment temperature, the fan speed and the heat loss of the asphalt mixture;
setting the road surface temperature to be x2, the environment temperature to be x3, the fan wind speed to be x4, the heat loss to be x5, setting the preset required heating temperature of the road surface to be y, and the area of the road surface to be heated to be S, wherein the required heating source temperature x1 is as follows:
wherein:
delta T is a time gap between two adjacent heating devices, wherein the heating plate is not heated;
a1 is the temperature coefficient of the heat source; a2 is the road surface temperature coefficient; a3 is the ambient temperature coefficient; a4 is the wind speed temperature coefficient;
substituting equation 2 into equation 3 yields a desired heated heat source temperature x1 of:
further, the first data acquisition module comprises: a pavement temperature acquisition submodule; the pavement temperature acquisition submodule comprises: the infrared temperature sensors, the temperature acquisition assembly and the first processor module are connected with the control module; each infrared temperature sensor is suitable for respectively acquiring road surface temperature data of a corresponding road section and sending the road surface temperature data to the first processor module through a temperature acquisition assembly; and the first processor module is adapted to send road surface temperature data to the control module.
Further, the second data acquisition module comprises: a heating temperature acquisition submodule; the heating temperature acquisition submodule comprises: the temperature measurement device comprises a plurality of temperature measurement sensors, a sampling module and a second processor module connected with the control module; each temperature measuring sensor is suitable for respectively acquiring heating temperature data of a heating device on a corresponding road section and sending the data to the second processor module through the sampling module; and the second processor module is adapted to send heating temperature data to the control module.
Further, the sampling module includes: a reference voltage circuit and a signal amplification circuit; the reference voltage circuit is suitable for providing corresponding heating temperature sampling signals to the signal amplification circuit; and the signal amplification circuit is suitable for amplifying the corresponding heating temperature sampling signal and transmitting the amplified signal to the second processor module.
Further, the heating temperature acquisition submodule further comprises: and the constant current source module is suitable for providing constant current for each temperature measuring sensor.
Further, the in-situ heat regeneration heating temperature control system further comprises: a temperature control unit; the control module is suitable for controlling the temperature control unit according to a comparison result of the temperature of the heat source to be heated and the heating temperature acquired in real time so as to control the heating device to adjust the heating temperature of the road surface.
Further, the temperature control unit includes: the multi-path output module and the relay module; the output end of the relay module is suitable for being connected with the heating control end of the heating device; the control module is suitable for controlling the multi-path output module to output corresponding control signals according to the comparison result of the temperature of the heat source to be heated and the heating temperature acquired in real time so as to control the relay module to output corresponding heating control signals to the heating device; and the heating device is suitable for adjusting the heating temperature of the road surface according to the heating control signal.
Further, the in-situ heat regeneration heating temperature control system further comprises: the display module is connected with the control module; the display module is suitable for collecting the preset heating temperature required by the road surface and sending the temperature to the control module.
In yet another aspect, the present invention further provides a method for controlling an in-situ heat regeneration heating temperature, including: the method comprises the steps that road surface heating data are collected in real time through a first data collection module and sent to a control module; the heating temperature of the heating device is collected in real time through a second data collection module and is sent to the control module; the method comprises the steps that a control module obtains the temperature of a heat source to be heated according to the preset temperature required by the pavement and pavement heating data, and controls a heating device to heat the pavement according to the temperature of the heat source to be heated; and comparing the temperature of the heat source to be heated with the heating temperature acquired in real time through the control module, and controlling the heating device to adjust the heating temperature of the road surface in real time according to the comparison result.
The in-situ heat regeneration heating temperature control system has the advantages that the in-situ heat regeneration heating temperature control system acquires the heat source temperature required to be heated by acquiring the road surface heating data and the preset road surface heating temperature in real time, controls the heating device to adjust the heating temperature of the road surface in real time by comparing the heat source temperature required to be heated with the acquired heating temperature of the heating device, and ensures the heating precision and the heating uniformity of the road surface heating, thereby improving the quality and the efficiency of road surface heating construction.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic block diagram of a hot-in-place regenerative heating temperature control system of the present invention;
FIG. 2 is a circuit diagram of a signal amplifying circuit of the temperature control system for in-situ heat regeneration heating according to the present invention;
FIG. 3 is a circuit diagram of a multi-channel output module of the temperature control system for in situ heat regeneration heating according to the present invention;
FIG. 4 is a pin circuit diagram of a control module of the thermal regeneration heating temperature control system according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below, and it is apparent that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1, the present embodiment 1 provides an in-situ heat regeneration heating temperature control system, including: the heating device comprises a control module, a first data acquisition module, a second data acquisition module and a heating device; the first data acquisition module is suitable for acquiring pavement heating data in real time and sending the pavement heating data to the control module; the second data acquisition module is suitable for acquiring the heating temperature of the heating device in real time and sending the heating temperature to the control module; the control module is suitable for obtaining the heat source temperature required to be heated according to the preset road surface required heating temperature and road surface heating data, and controlling the heating device to heat the road surface according to the heat source temperature required to be heated; and the control module is suitable for comparing the temperature of the heat source to be heated with the heating temperature acquired in real time and controlling the heating device to adjust the heating temperature of the road surface in real time according to the comparison result.
Specifically, the in-place heat regenerative heating temperature control system of this embodiment obtains the heat source temperature of required heating through gathering road surface heating data and the required heating temperature in road surface that predetermines in real time to through comparing the heat source temperature of required heating and the heating temperature of the heating device who gathers, control heating device real-time adjustment is to the heating temperature on road surface, guarantees the heating precision and the heating homogeneity of road surface heating, thereby improves the quality and the efficiency of road surface heating construction.
Specifically, as the characteristics of the asphalt pavement material require a certain heating time, the required heating temperature of the pavement mixture is realized, the temperature is continuously transferred from top to bottom to increase the temperature, the internal temperature of the pavement after the pavement is heated is closely related to the heating time, and the temperature of the pavement mixture with the required heating depth can meet the requirement of the required heating temperature along with the increase of the continuous heating time; thus, the heating time T required for the heating device to heat the road surface to be heated to the preset road surface heating temperature is set to be T, and the heating time T is related to the road surface thickness H of the road surface to be heated, namely
Wherein: l is the length of the heating device; v is the running speed of the heating device; k is the heat conductivity coefficient of the asphalt mixture; alpha is the density of the asphalt mixture;
it follows that the heating time T can be adjusted by the driving speed V of the heating device, i.e. according to equation 1:
the road surface heating data includes: the pavement temperature, the environment temperature, the fan speed and the heat loss of the asphalt mixture;
setting the road surface temperature to be x2, the environment temperature to be x3, the fan wind speed to be x4, the heat loss to be x5, setting the preset required heating temperature of the road surface to be y, and the area of the road surface to be heated to be S, wherein the required heating source temperature x1 is as follows:
wherein:
delta T is a time gap between two adjacent heating devices, wherein the heating plate is not heated;
a1 is the temperature coefficient of the heat source; a2 is the road surface temperature coefficient; a3 is the ambient temperature coefficient; a4 is the wind speed temperature coefficient;
substituting equation 2 into equation 3 yields a desired heated heat source temperature x1 of:
specifically, in this embodiment, the heating device heats the road surface by means of heated air circulation heating.
Specifically, the fan speed refers to the speed of a circulating fan in hot air circulating heating, and can be acquired through a speed detection device; the ambient temperature can be collected by a temperature detection device.
In this embodiment, the first data acquisition module includes: a pavement temperature acquisition submodule; the pavement temperature acquisition submodule comprises: the infrared temperature sensors, the temperature acquisition assembly and the first processor module are connected with the control module; each infrared temperature sensor is suitable for respectively acquiring road surface temperature data of a corresponding road section and sending the road surface temperature data to the first processor module through a temperature acquisition assembly; and the first processor module is adapted to send road surface temperature data to the control module.
Specifically, the pavement temperature acquisition submodule realizes real-time acquisition and detection of pavement temperature and real-time feedback, and the pavement temperature acquisition submodule is used as a reference basis for providing heat source temperature and an evaluation basis for temperature uniformity of each link for the heating device.
Specifically, the temperature acquisition assembly is used in combination with each infrared temperature sensor, and is connected with the first processor module in a high-speed CAN-BUS BUS connection mode.
In this embodiment, the second data acquisition module includes: a heating temperature acquisition submodule; the heating temperature acquisition submodule comprises: the temperature measurement device comprises a plurality of temperature measurement sensors, a sampling module and a second processor module connected with the control module; each temperature measuring sensor is suitable for respectively acquiring heating temperature data of a heating device on a corresponding road section and sending the data to the second processor module through the sampling module; and the second processor module is adapted to send heating temperature data to the control module.
Specifically, the temperature sensor is, for example and without limitation, a PT100 thermal resistor.
The sampling module comprises: a reference voltage circuit and a signal amplification circuit; the reference voltage circuit is suitable for providing corresponding heating temperature sampling signals to the signal amplification circuit; and the signal amplification circuit is suitable for amplifying the corresponding heating temperature sampling signal and transmitting the amplified signal to the second processor module.
Specifically, as shown in fig. 2, the signal amplification circuit employs a differential signal amplification circuit; the reference voltage circuit is used for providing reference voltage of the heat source temperature sampling signal, is connected with the differential signal amplifying circuit and is used as a sampling circuit for collecting the heat source temperature accurate measurement signal of the heating device, so that the second processor module can obtain accurate measurement heat source temperature data.
Specifically, the heat source temperature signal amplified by the differential signal amplifying circuit is converted by the AD conversion module and then transmitted to the second processor module.
Specifically, in the embodiment, the heat source temperatures at five positions are collected as an example, as shown in fig. 2, PT0-1, PT0-2, PT1-1, PT1-2, and the like in the figure are used as heat source temperature sampling signals; AD _0 to AD _4 are heat source temperature signals after amplification.
Further, the heating temperature acquisition submodule further comprises: and the constant current source module is suitable for providing constant current for each temperature measuring sensor.
Specifically, the constant current source module utilizes the characteristic that the LM358 operational amplifier works in a linear region, infinite input impedance, small quiescent current and the characteristic that the bias circuit provides stable and proper bias current to provide constant current for the temperature measuring sensor, so that the temperature measuring sensor is ensured not to generate heat to cause measurement errors due to the driving current, and the accuracy of the temperature of the heat source is improved.
In this embodiment, the in-situ heat regeneration heating temperature control system further includes: a temperature control unit; the control module is suitable for controlling the temperature control unit according to a comparison result of the temperature of the heat source to be heated and the heating temperature acquired in real time so as to control the heating device to adjust the heating temperature of the road surface.
Specifically, the temperature control unit includes: the multi-path output module and the relay module; the output end of the relay module is suitable for being connected with the heating control end of the heating device; the control module is suitable for controlling the multi-path output module to output corresponding control signals according to the comparison result of the temperature of the heat source to be heated and the heating temperature acquired in real time so as to control the relay module to output corresponding heating control signals to the heating device; and the heating device is suitable for adjusting the heating temperature of the road surface according to the heating control signal.
Specifically, the relay module comprises a solid state relay; as shown in fig. 3, the multi-output module is composed of an EL357 photocoupler, and realizes control over the solid-state relay, thereby realizing control over the heating temperature output of the heating device.
Specifically, as shown in fig. 4, the control module is, for example and without limitation, a 32-bit ARM microcontroller, and is composed of an STM32F103C8T6 and an integrated circuit having an arithmetic function.
Specifically, the AD _0 to AD _4 signals are respectively connected with pins PA0 to PA4 of the STM32F103C8T6 microcontroller.
Specifically, pins PB9 to PB5 of the STM32F103C8T6 microcontroller output control signals CPU _ OUT0 to CPU _ OUT4, respectively.
Specifically, the in-place heat regeneration heating temperature control system further comprises a power supply module, wherein the power supply module is connected with the first data acquisition module, the second data acquisition module, the temperature control unit, the control module, the display module and the like through power lines so as to provide stable power supply voltage required by each module and ensure safe and stable work of each module.
In this embodiment, the in-situ heat regeneration heating temperature control system further includes: the display module is connected with the control module; the display module is suitable for collecting the preset heating temperature required by the road surface and sending the temperature to the control module.
Specifically, the preset heating temperature required by the road surface is collected through a human-computer interaction interface, and is displayed through a display module; the display module can also display road surface temperature data and the temperature of a heat source required to be heated in real time, and can also perform feedback early warning when the temperature of the heat source required to be heated and the heating temperature of the heating device deviate.
Example 2
As shown in fig. 3, based on embodiment 1, this embodiment 2 provides a method for controlling the heating temperature of the in-situ heat regeneration, which includes: the method comprises the steps that road surface heating data are collected in real time through a first data collection module and sent to a control module; the heating temperature of the heating device is collected in real time through a second data collection module and is sent to the control module; the method comprises the steps that a control module obtains the temperature of a heat source to be heated according to the preset temperature required by the pavement and pavement heating data, and controls a heating device to heat the pavement according to the temperature of the heat source to be heated; and comparing the temperature of the heat source to be heated with the heating temperature acquired in real time through the control module, and controlling the heating device to adjust the heating temperature of the road surface in real time according to the comparison result.
Specifically, the specific working principle and circuit structure of the first data acquisition module, the second data acquisition module and the control module are described in embodiment 1, and are not described herein again.
Specifically, the control method of the in-situ heat regeneration heating temperature can be realized through the existing PID control algorithm, and the heating device is controlled to heat the road surface according to the constructed road surface heating model and the PID control algorithm, so that the road surface temperature is stably controlled at the preset heating temperature required by the road surface.
In summary, the in-situ heat regeneration heating temperature control system and the control method of the application establish a pavement heat distribution model based on the pavement temperature, the environment temperature and the fan wind speed which are collected in real time, and evaluate the pavement temperature standard reaching performance and uniformity; meanwhile, the heating temperature of the heating device is controlled to be adjusted to the road surface in real time based on factors such as preset road surface required heating temperature, road surface temperature, environment temperature and fan air speed, the heating temperature of the heating device and the like, so that automatic adjustment and control of the heat source temperature in the in-place heat regeneration construction process are realized, and the efficiency and the quality of heating the road surface are improved.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. An in-situ heat regeneration heating temperature control system, comprising:
the heating device comprises a control module, a first data acquisition module, a second data acquisition module and a heating device; wherein
The first data acquisition module is suitable for acquiring pavement heating data in real time and sending the pavement heating data to the control module;
the second data acquisition module is suitable for acquiring the heating temperature of the heating device in real time and sending the heating temperature to the control module;
the control module is suitable for obtaining the heat source temperature required to be heated according to the preset road surface required heating temperature and road surface heating data, and controlling the heating device to heat the road surface according to the heat source temperature required to be heated; and
the control module is suitable for comparing the temperature of a heat source to be heated with the heating temperature acquired in real time, and controlling the heating device to adjust the heating temperature of the road surface in real time according to the comparison result.
2. The in-situ heat regenerative heating temperature control system of claim 1,
setting the heating time T required for the heating device to heat the road surface to be heated to the preset road surface heating temperature, wherein the heating time T is related to the road surface thickness H of the road surface to be heated, namely
Wherein: l is the length of the heating device; v is the running speed of the heating device; k is the heat conductivity coefficient of the asphalt mixture; alpha is the density of the asphalt mixture;
it follows that the heating time T can be adjusted by the driving speed V of the heating device, i.e. according to equation 1:
the road surface heating data includes: the pavement temperature, the environment temperature, the fan speed and the heat loss of the asphalt mixture;
setting the road surface temperature to be x2, the environment temperature to be x3, the fan wind speed to be x4, the heat loss to be x5, setting the preset required heating temperature of the road surface to be y, and the area of the road surface to be heated to be S, wherein the required heating source temperature x1 is as follows:
wherein:
delta T is a time gap between two adjacent heating devices, wherein the heating plate is not heated;
a1 is the temperature coefficient of the heat source; a2 is the road surface temperature coefficient; a3 is the ambient temperature coefficient; a4 is the wind speed temperature coefficient;
substituting equation 2 into equation 3 yields a desired heated heat source temperature x1 of:
3. the in-situ heat regenerative heating temperature control system of claim 2,
the first data acquisition module comprises: a pavement temperature acquisition submodule;
the pavement temperature acquisition submodule comprises:
the infrared temperature sensors, the temperature acquisition assembly and the first processor module are connected with the control module; wherein
Each infrared temperature sensor is suitable for respectively acquiring road surface temperature data of a corresponding road section and sending the road surface temperature data to the first processor module through a temperature acquisition assembly; and
the first processor module is adapted to send road surface temperature data to the control module.
4. The in-situ heat regenerative heating temperature control system of claim 2,
the second data acquisition module comprises: a heating temperature acquisition submodule;
the heating temperature acquisition submodule comprises:
the temperature measurement device comprises a plurality of temperature measurement sensors, a sampling module and a second processor module connected with the control module; wherein
Each temperature measuring sensor is suitable for respectively acquiring heating temperature data of the heating device on the corresponding road section and sending the data to the second processor module through the sampling module; and
the second processor module is adapted to send heating temperature data to the control module.
5. The in-situ heat regeneration heating temperature control system of claim 4,
the sampling module comprises: a reference voltage circuit and a signal amplification circuit;
the reference voltage circuit is suitable for providing corresponding heating temperature sampling signals to the signal amplification circuit; and
the signal amplification circuit is suitable for amplifying the corresponding heating temperature sampling signal and transmitting the amplified signal to the second processor module.
6. The in-situ heat regeneration heating temperature control system of claim 5,
the heating temperature acquisition submodule further comprises: and the constant current source module is suitable for providing constant current for each temperature measuring sensor.
7. The in-situ heat regenerative heating temperature control system of claim 1,
the in-situ heat regeneration heating temperature control system further includes: a temperature control unit;
the control module is suitable for controlling the temperature control unit according to a comparison result of the temperature of the heat source to be heated and the heating temperature acquired in real time so as to control the heating device to adjust the heating temperature of the road surface.
8. The in-situ heat regeneration heating temperature control system of claim 7,
the temperature control unit includes: the multi-path output module and the relay module;
the output end of the relay module is suitable for being connected with the heating control end of the heating device;
the control module is suitable for controlling the multi-path output module to output corresponding control signals according to the comparison result of the temperature of the heat source to be heated and the heating temperature acquired in real time so as to control the relay module to output corresponding heating control signals to the heating device; and
the heating device is suitable for adjusting the heating temperature of the road surface according to the heating control signal.
9. The in-situ heat regenerative heating temperature control system according to claims 6&7,
the in-situ heat regeneration heating temperature control system further includes: the display module is connected with the control module;
the display module is suitable for collecting the preset heating temperature required by the road surface and sending the temperature to the control module.
10. A method for controlling a heating temperature of a hot in-place regenerator, comprising:
the method comprises the steps that road surface heating data are collected in real time through a first data collection module and sent to a control module;
the heating temperature of the heating device is collected in real time through a second data collection module and is sent to the control module;
the method comprises the steps that a control module obtains the temperature of a heat source to be heated according to the preset temperature required by the pavement and pavement heating data, and controls a heating device to heat the pavement according to the temperature of the heat source to be heated; and
the control module compares the temperature of a heat source to be heated with the heating temperature acquired in real time, and controls the heating device to adjust the heating temperature of the road surface in real time according to the comparison result.
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| CN113515153A (en) * | 2021-07-23 | 2021-10-19 | 山东交通学院 | Control method for heating power and running speed in-place heat regeneration construction |
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| CN112900213A (en) * | 2021-01-25 | 2021-06-04 | 江苏集萃道路工程技术与装备研究所有限公司 | Hot air circulation heating device with temperature control system and temperature control method |
| CN112900213B (en) * | 2021-01-25 | 2022-11-25 | 江苏集萃道路工程技术与装备研究所有限公司 | Hot air circulation heating device with temperature control system and temperature control method |
| CN113515153A (en) * | 2021-07-23 | 2021-10-19 | 山东交通学院 | Control method for heating power and running speed in-place heat regeneration construction |
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Application publication date: 20201020 |