WO2013029269A1

WO2013029269A1 - Asphalt heating device and asphalt stirring equipment

Info

Publication number: WO2013029269A1
Application number: PCT/CN2011/079264
Authority: WO
Inventors: 尹友中; 彭琼梅; 江艳平; 朱春灿; 王俊杰
Original assignee: 长沙中联重工科技发展股份有限公司; 湖南中联重科专用车有限责任公司
Priority date: 2011-09-01
Filing date: 2011-09-01
Publication date: 2013-03-07

Abstract

An asphalt heating device and asphalt stirring equipment having the heating device. The asphalt heating device comprises an asphalt tank (1) and a heating tank (2). A first heater (25) is provided inside the heating tank, the asphalt tank (1) has an asphalt outlet (11), the heating tank (2) has an asphalt inlet (21) and an asphalt outlet (22), and the asphalt outlet (11) of the asphalt tank (1) communicates with the asphalt inlet (21) of the heating tank (2) through an oil supply pipeline (31). The asphalt heating device further comprises an asphalt pump (4) and a first return pipeline (32). The heating tank (2) further comprises an asphalt return port (23), the first return pipeline (32) enables the asphalt outlet (22) of the heating tank to communicate with the asphalt return port (23), and the asphalt pump (4) is serially connected to the first return pipeline (32). The asphalt heating device is capable of heating asphalt rapidly and evenly, the asphalt near the heating pipe of the heater is not easy to age, and the energy consumption is low.

Description

Asphalt heating device and asphalt mixing equipment

Technical field

The present invention relates to the field of construction machinery, and in particular to an asphalt heating device, and to an asphalt mixing device having the asphalt heating device. Background technique

Asphalt mixing equipment, also known as asphalt mixing equipment or asphalt mixing station, is the key equipment for asphalt pavement construction. It is mainly used to heat and measure sand and stone materials, asphalt and other materials into asphalt mixture. Therefore, asphalt mixing equipment is usually equipped with an asphalt heating device that heats the asphalt.

The existing asphalt heating device generally comprises an asphalt tank and a heating tank, the heating tank has a heater, the asphalt tank has an asphalt outlet, the heating tank has an asphalt inlet and an asphalt outlet, and the asphalt outlet of the asphalt tank is The asphalt inlet of the heating tank is connected through the oil supply line. When the asphalt needs to be heated, the required amount of bitumen in the bitumen tank is first drawn into the heating tank through the oil supply line, and then the internal asphalt is heated by the heating tank. The asphalt heated to a predetermined temperature is supplied to the asphalt metering cylinder, and after metering, it is stirred and mixed with other aggregates such as sand and gravel.

It can be seen that the existing asphalt heating device adopts static heating, so the heating speed is slow and the heating is not uniform, and the asphalt near the heating pipe of the heater is heated for a long time at a high temperature, and the asphalt aging phenomenon is prone to occur. Moreover, if the heating time is long, the asphalt near the heating pipe will be carbonized and accumulated on the pipe wall, and the heat exchange efficiency of the heater is lowered, resulting in an increase in energy consumption. Summary of the invention

SUMMARY OF THE INVENTION An object of the present invention is to provide an asphalt heating device capable of rapidly and uniformly heating asphalt, which is also less susceptible to aging of the asphalt near the heating pipe of the heater, and which consumes less energy. In order to achieve the above object, the present invention provides an asphalt heating device comprising an asphalt tank and a heating tank, the heating tank having a first heater, the asphalt tank having an asphalt outlet, the heating tank having an asphalt inlet And an asphalt outlet, the asphalt outlet of the asphalt tank is connected to the asphalt inlet of the heating tank through an oil supply pipeline, wherein the asphalt heating device further comprises an asphalt pump and a first return pipeline, the heating tank further comprising The asphalt return port communicates the asphalt outlet of the heating tank with the asphalt return port, and the asphalt pump is connected in series on the first return line.

Preferably, the asphalt tank further has a bitumen return port, and the bitumen heating device further includes a second return line, one end of the second return line is in communication with the asphalt return port of the asphalt tank, and the second return pipe The other end of the road is in communication with the first return line.

Preferably, the other end of the second return line communicates with the first return line through a first three-way valve.

Preferably, the asphalt heating device comprises a plurality of the asphalt tanks connected in parallel with each other.

Preferably, the asphalt heating device comprises a first asphalt tank and a second asphalt tank connected in parallel with each other, the asphalt heating device further comprising a first pipeline, a second pipeline, a third pipeline and a fourth pipeline. The first pipeline connects the asphalt outlet of the first asphalt tank to the oil supply pipeline, and the second pipeline connects the asphalt return port of the first asphalt tank to the second return pipeline The third pipeline connects the asphalt outlet of the second asphalt tank with the oil supply pipeline, and the fourth pipeline connects the asphalt return port of the second asphalt tank with the second return pipe The road is connected.

Preferably, the first pipeline is in communication with the oil supply pipeline through a second three-way valve, and the second pipeline is in communication with the second return pipeline through a third three-way valve.

Preferably, a second heater is disposed in the asphalt tank.

Preferably, the first heater and the second heater are coil heaters, and the coil heater includes a coil in which a heating medium flows.

Preferably, the asphalt heating device further includes a controller, a first temperature sensor and a second temperature sensor, wherein the first temperature sensor is configured to measure a temperature of the asphalt in the heating tank, The second temperature sensor is configured to measure the temperature of the asphalt in the asphalt tank, and the controller separately controls the first according to a preset asphalt temperature and a temperature measured by the first temperature sensor and the second temperature sensor Heater and second heater.

Preferably, the controller controls the first heater and the second heater by controlling a flow rate of a heating medium within the coil.

Preferably, the asphalt heating device further includes an asphalt metering cylinder and an oil discharge pipeline, one end of the oil discharge pipeline is in communication with the asphalt metering cylinder, and the other end of the oil discharge pipeline is passed through the fourth three-way valve The first return line is connected.

In another aspect, the present invention also provides an asphalt mixing apparatus comprising the asphalt heating apparatus as described above.

According to the above technical solution, when the heating tank heats the asphalt inside, the operation of the asphalt pump causes the asphalt in the heating tank to continuously circulate through the first return pipeline, thereby realizing dynamic heating of the asphalt, thereby enabling rapid and uniform heating. The pitch is heated, and the pitch near the heating pipe of the first heater can flow frequently without local overheating for a long time, so that it is not easily aged. Moreover, the asphalt is not easily accumulated on the pipe wall, thereby improving the heat exchange efficiency of the heater and reducing the energy consumption.

Other features and advantages of the invention will be described in detail in the detailed description which follows. DRAWINGS

The drawings are intended to provide a further understanding of the invention, and are in the In the drawing:

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing the principle of an asphalt heating apparatus according to an embodiment of the present invention; and Fig. 2 is a schematic view showing the principle of an asphalt heating apparatus according to another embodiment of the present invention. Description of the reference numerals 1 asphalt tank; 2 heating tank;

11 asphalt outlet of asphalt tank; 21 asphalt inlet of heating tank;

22 the asphalt outlet of the heating tank; 31 the oil supply pipeline;

4 asphalt pump; 32 first return line;

23 asphalt return port of the heating tank; 12 asphalt return port of the asphalt tank;

33 second return line; 51 first three-way valve;

1A first asphalt tank; 1B second asphalt tank;

1A1 first line; 1A2 second line;

1B1 third pipeline; 1B2 fourth pipeline;

11A asphalt outlet of the first asphalt tank; 12A asphalt return port of the first asphalt tank;

11B asphalt outlet of the second asphalt tank; 12B asphalt return port of the second asphalt tank;

52 second three-way valve; 53 third three-way valve;

65 second heater; 25 first heater;

71 first temperature sensor; 72 second temperature sensor;

8 34 oil discharge pipeline;

54 fourth three-way valve; 91 heating medium supply pipeline;

detailed description

The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are intended to be illustrative and not restrictive.

As shown in FIG. 1, an embodiment of the present invention provides an asphalt heating device including an asphalt tank 1 and a heating tank 2 having a first heater 25 therein, the asphalt The tank 1 has an asphalt outlet 11 having an asphalt inlet 21 and an asphalt outlet 22, the asphalt outlet 11 of the asphalt tank 1 and the asphalt inlet 21 of the heating tank 2 passing The oil supply line 31 is in communication, wherein the asphalt heating device further comprises an asphalt pump 4 and a first return line 32, the heating tank 2 further comprising an asphalt return port 23, wherein the first return line 32 will The asphalt outlet 22 of the heating tank is in communication with the asphalt return port 23, which is connected in series to the first return line 32.

According to the above technical solution, when the heating tank 2 heats the asphalt inside, the operation of the asphalt pump 4 causes the asphalt in the heating tank 2 to continuously circulate through the first return line 32, thereby realizing dynamic heating of the asphalt, thus The pitch can be heated quickly and uniformly, and the pitch near the heating pipe of the first heater 25 can flow frequently without local overheating for a long time, and thus is not easily deteriorated. Moreover, the asphalt is not easily accumulated on the pipe wall, thereby improving the heat exchange efficiency of the heater and reducing the energy consumption.

Preferably, as shown in FIG. 1, the asphalt tank 1 further has an asphalt return port 12, and the asphalt heating device further includes a second return line 33, one end of the second return line 33 and the asphalt tank 1 The asphalt return port 12 is in communication, and the other end of the second return line 33 is in communication with the first return line 32. By providing the second return line 33, the heating tank 2 and the asphalt in the asphalt tank 1 can be circulated together, thereby simultaneously heating the asphalt in the heating tank 2 and the asphalt tank 1 by heating the tank 2 to satisfy the heating of a large amount of asphalt. Requirements.

More preferably, as shown in Fig. 1, the other end of the second return line 33 communicates with the first return line 32 through the first three-way valve 51. Thus, it is possible to select whether to heat only the pitch in the heating tank 2 by controlling the first three-way valve 51, or to simultaneously heat the pitch in the heating tank 2 and the asphalt tank 1 by heating the tank 2. Specifically, when the ab passage of the first three-way valve 51 is in communication, the asphalt heating device only heats the asphalt in the heating tank 2, and when the ac passage of the first three-way valve 51 is in communication, the asphalt heating device simultaneously The heating tank 2 and the asphalt in the asphalt tank 1 are heated, and when the abc of the first three-way valve 51 is fully connected, the circulation speed of the asphalt can be further accelerated, so that the asphalt in the heating tank 2 and the asphalt tank 1 can be more quickly Heat up.

The number of the asphalt tanks 1 can be set as needed, for example, in the embodiment shown in Fig. 1, only one asphalt tank 1 is included. When there are a plurality of asphalt tanks 1, the plurality of asphalt tanks 1 can In parallel with each other.

The asphalt heating apparatus of the embodiment shown in Fig. 2 includes two asphalt tanks, and more specifically, the asphalt heating apparatus includes a first asphalt tank 1A and a second asphalt tank IB which are connected in parallel with each other, and the asphalt heating apparatus further includes a first pipe 1A1, a second pipe 1A2, a third pipe 1B1, and a fourth pipe 1B2, the first pipe 1A1 is the asphalt outlet 11A of the first asphalt tank 1A and the oil supply pipe 31, the second line 1A2 communicates the asphalt return port 12A of the first asphalt tank 1A with the second return line 33, and the third line 1B1 connects the second asphalt tank 1B. The asphalt outlet 11B communicates with the oil supply line 31, and the fourth line 1B2 communicates the asphalt return port 12B of the second asphalt tank 1B with the second return line 33.

Preferably, as shown in FIG. 2, the first pipeline 1A1 and the oil supply pipeline 31 are connected by a second three-way valve 52, and the second pipeline 1A2 and the second return pipeline 33 are passed. The third three-way valve 53 is in communication. Therefore, when it is necessary to simultaneously heat the pitch in the heating tank 2 and the asphalt tank 1, the asphalt in the first asphalt tank or the second asphalt tank can be selectively selected by the second three-way valve 52 and the third three-way valve 53. heating. Specifically, in the case where the ac passage of the first three-way valve 51 is in communication, when the de passage of the second three-way valve 52 is in communication, and the cg passage of the third three-way valve 53 is in communication, the asphalt heating device simultaneously heats The tank 2 and the asphalt in the first asphalt tank 1A are heated; when the df passage of the second three-way valve 52 is in communication, and the ch passage of the third three-way valve 53 is in communication, the asphalt heating device simultaneously heats the tank 2 and the The asphalt in the asphalt tank 1B is heated; when the def channel of the second three-way valve 52 is fully connected, and the cgh channel of the third three-way valve 53 is fully connected, the asphalt heating device simultaneously heats the tank 2, the first asphalt The pitch in the tank 1A and the second asphalt tank 1B is heated.

Of course, the asphalt heating device can be provided with more asphalt tanks as needed. The connection relationship of more asphalt tanks and the setting of the three-way valve are similar to the above-mentioned technical solutions including two asphalt tanks, and will not be described herein.

In the above asphalt heating apparatus, the operation of the asphalt pump 4 causes the asphalt to continuously circulate and flow to achieve dynamic heating, and therefore the asphalt in the asphalt tank 1 usually needs to be in a flowable state. this is OK This is achieved by providing the asphalt tank 1 with a flowable asphalt, but preferably, as shown in FIGS. 1 and 2, the asphalt tank 1 is provided with a second heater 65. The asphalt tank 1 is heated by the second heater 65, so that the solid asphalt in the asphalt tank 1 is preheated to a flowable state (for example, heated to 60-80 ° C, the specific temperature depends on the viscosity index of the asphalt), and then reused. The asphalt pump 4 circulates the bitumen and continues to be heated by the heating tank 2 to an operating temperature (e.g., 150-180 ° C).

The first heater 25 and the second heater 65 may be various suitable heaters, such as an electric heater. As a specific embodiment, as shown in FIGS. 1 and 2, the first heater 25 And the second heater 65 is a coil heater including a coil in which a heating medium (e.g., heat transfer oil, high temperature gas, etc.) flows. The heating medium flows in from the oil inlet of the coil, flows out from the oil outlet of the coil, and exchanges heat with the asphalt outside the coil during the flow in the coil, thereby heating the asphalt to a desired temperature. For example, as shown in FIGS. 1 and 2, a heating medium source (for example, a heat transfer oil heating furnace, not shown) is connected to a heating medium supply line 91 and a heating medium return line 92, and a coil of the first heater 25. The oil inlet of the coil of the second heater 65 is in parallel with the heating medium supply line 91 through the respective oil inlet lines, and the coil of the first heater 25 and the coil of the second heater 65 are discharged. The ports communicate with the heating medium return line 92 in parallel through respective oil discharge lines. Moreover, a flow control valve may be respectively disposed on the oil inlet pipe of the coil of the first heater 25 and the coil of the second heater 65, so that the flow rate of the heating medium can be controlled to separately control the first heater 25 and the second The heating rate of the heater 65.

The first heater 25 and the second heater 65 may be manually controlled. Preferably, as shown in FIGS. 1 and 2, the asphalt heating device further includes a controller, a first temperature sensor 71, and a second temperature sensor 72, The first temperature sensor 71 is for measuring the temperature of the asphalt in the heating tank 2, the second temperature sensor 72 is for measuring the temperature of the asphalt in the asphalt tank 1, and the controller is based on a preset asphalt The temperature and the temperatures measured by the first temperature sensor 71 and the second temperature sensor 72 control the first heater 25 and the second heater 65, respectively. When the temperature measured by the first temperature sensor 71 or the second temperature sensor 72 approaches a respective preset temperature, the first heater 25 or the second heater 65 is slowed down, when the first temperature sensor 71 or the second temperature is transmitted. When the temperature measured by the sensor 72 reaches the respective preset temperatures, the first heater 25 or the second heater 65 is stopped from heating. As described above, the first heater 25 and the second heating can be separately controlled by controlling the flow rate of the heating medium in the coil of the first heater 25 and the coil of the second heater 65 (for example, by a flow control valve), respectively. The heating rate of the device 65. The controller can take various suitable forms, such as a PLC (Programmable Controller).

As shown in FIG. 1 and FIG. 2, the asphalt heating device may further include an asphalt metering cylinder 8 and an oil discharge pipeline 34. One end of the oil discharge pipeline 34 communicates with the asphalt metering cylinder 8, and the oil discharge pipeline 34 The other end is in communication with the first return line 32 through a fourth three-way valve 54. Therefore, when the heating tank 2 is required to heat the asphalt, the ai passage of the fourth three-way valve 54 is communicated; when it is required to lead the asphalt which has reached the predetermined temperature, the ij passage of the fourth three-way valve 54 is communicated, thereby supplying the asphalt The asphalt metering cylinder 8 is metered and mixed with other aggregates such as sand and gravel.

The first three-way valve 51, the second three-way valve 52, and the third three-way valve 53 described above may be manually controlled or automatically controlled by a controller.

In addition, the arrows in Figures 1 and 2 adaptively indicate the flow direction of the fluid (including the asphalt and the heating medium).

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments, and various simple modifications of the technical solutions of the present invention may be made within the scope of the technical idea of the present invention. These simple variations are within the scope of the invention.

It should be further noted that the specific technical features described in the above specific embodiments may be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not be further described in various possible combinations.

In addition, any combination of various embodiments of the invention may be made, as long as it does not deviate from the idea of the invention, and should also be regarded as the disclosure of the invention.

Claims

Rights request

An asphalt heating device comprising an asphalt tank (1) and a heating tank (2) having a first heater (25) having an asphalt outlet (11) The heating tank (2) has an asphalt inlet (21) and an asphalt outlet (22), and the asphalt outlet (11) of the asphalt tank (1) and the asphalt inlet (21) of the heating tank (2) pass The oil supply line (31) is connected, wherein the asphalt heating device further comprises an asphalt pump (4) and a first return line

(32), the heating tank (2) further includes an asphalt return port (23), and the first return line (32) communicates the asphalt outlet (22) of the heating tank and the asphalt return port (23), The asphalt pump (4) is connected in series to the first return line (32).

2. The asphalt heating apparatus according to claim 1, wherein the asphalt tank (1) further has a bitumen return port (12), and the bitumen heating device further comprises a second return line (33), One end of the second return line (33) is in communication with the asphalt return port (12) of the asphalt tank (1), and the other end of the second return line (33) is connected to the first return line (32) Connected.

The asphalt heating device according to claim 2, wherein the other end of the second return line (33) passes through the first three-way between the first return line (32) and the first return line (32) valve

(51) Connected.

4. The asphalt heating apparatus according to claim 2, wherein the asphalt heating apparatus comprises a plurality of the asphalt tanks (1) connected in parallel with each other.

The asphalt heating device according to claim 4, wherein the asphalt heating device comprises a first asphalt tank (1A) and a second asphalt tank (IB) connected in parallel with each other, the asphalt heating device further comprising a pipe (1A1), a second pipe (1A2), a third pipe (1B1), and a fourth pipe (1B2), the first pipe (1A1) will be the first asphalt tank (1A) Asphalt export (HA) is in communication with the oil supply line (31), the second line (1A2) is a bitumen return port (12A) of the first bitumen tank (1A) and the second return line ( 33) communicating, the third pipeline (1B1) communicating the asphalt outlet (11B) of the second asphalt tank (IB) with the oil supply pipeline (31), the fourth pipeline (1B2) The asphalt return port (12B) of the second asphalt tank (IB) is in communication with the second return line (33).

The asphalt heating device according to claim 5, wherein the first pipeline (1A1) and the oil supply pipeline (31) are connected by a second three-way valve (52), the The second line (1A2) is in communication with the second return line (33) through a third three-way valve (53).

The asphalt heating apparatus according to any one of claims 1 to 6, wherein a second heater (65) is disposed in the asphalt tank (1).

8. The asphalt heating apparatus according to claim 7, wherein the first heater (25) and the second heater (65) are coil heaters, and the coil heater comprises a coil The heating medium flows within the coil.

9. The asphalt heating apparatus according to claim 8, wherein the asphalt heating apparatus further comprises a controller, a first temperature sensor (71) and a second temperature sensor (72), the first temperature sensor ( 71) for measuring the temperature of the asphalt in the heating tank (2), the second temperature sensor (72) is for measuring the temperature of the asphalt in the asphalt tank (1), the controller is preset according to The pitch temperature and the temperatures measured by the first temperature sensor (71) and the second temperature sensor (72) control the first heater (25) and the second heater (65), respectively.

10. The asphalt heating apparatus according to claim 9, wherein said controller controls said first heater (25) and said by controlling a flow rate of a heating medium in said coil Two heaters (65).

The asphalt heating device according to any one of claims 1 to 6, wherein the asphalt heating device further comprises an asphalt metering cylinder (8) and an oil discharging pipeline (34), the oil discharging pipeline ( One end of 34) is in communication with the asphalt metering cylinder (8), and the other end of the oil discharge line (34) is in communication with the first return line (32) through a fourth three-way valve (54).

12. An asphalt mixing apparatus, characterized in that the asphalt mixing apparatus comprises the asphalt heating apparatus according to any one of claims 1 to 11.