Device for removing bubbles in asphalt through rotary centrifugation

Abstract

The utility model relates to the technical field of asphalt bubble removal, in particular to a device for removing bubbles in asphalt by rotating and centrifuging, which comprises a rotating shaft, a rotating and centrifuging device, a disc bottom plate and a shell, an umbrella-shaped structure is arranged at the bottom of the rotary centrifugal device; the rotating shaft is connected with the rotating centrifugal device, the umbrella-shaped structure and the shell inner wall cleaning device from top to bottom to form an integral structure; the device further comprises a shell, an asphalt feeding port and a vacuum pump connector are arranged at the two ends of the top of the shell respectively, a rotary centrifugal method is introduced into a traditional asphalt bubble removing method, firstly, asphalt heated to be in a flowing state is poured into the rotary centrifugal device, first-time gas-liquid separation and gap extrusion are completed under the action of centrifugal force, and the asphalt bubble removing effect is achieved; and then, the rotating shaft drives the umbrella-shaped structure and the shell inner wall cleaning device to rotate, so that the bubbles in the asphalt are exposed in the vacuum environment, and secondary bubble removal is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of asphalt defoaming, in particular to a device for removing bubbles in asphalt by rotary centrifugation. Background Art

[0002] When preparing asphalt-based carbon fibers with characteristics such as high modulus and high thermal conductivity, during the pre-spinning treatment of mesophase pitch melt spinning, which is a key process in the preparation of continuous long filaments of asphalt-based carbon fibers, due to the relatively wide molecular weight distribution of mesophase pitch in asphalt, with a relative molecular weight range of 370 - 2000, that is, low molecular weight volatile components vaporize at the spinning temperature to form fine bubbles. The existence of these fine bubbles will lead to uneven fiber structure, affect the mechanical properties and thermal conductivity of carbon fibers, cause filament breakage during spinning, and it is impossible to obtain stable continuous long filaments, thereby affecting the preparation of asphalt-based carbon fibers. Reducing or eliminating bubbles can prevent filament breakage during the spinning process, thus realizing continuous and stable fiber production.

[0003] When conducting asphalt-related experiments, bubbles in asphalt may not only be generated due to contact with air and water evaporation, but also be formed due to volume expansion and contraction caused by temperature changes. These bubbles often have an adverse impact on asphalt experiments, resulting in distorted and unstable experimental results. By reducing or eliminating bubbles, the impact of bubbles in asphalt on the results of asphalt-related experiments can be reduced, thereby making the results of asphalt-related experiments more accurate.

[0004] However, using the above method, Chinese invention patent CN103242878A discloses an asphalt bubble removal device and its defoaming method. This method uses two containers, an upper one and a lower one. The negative pressure and gravity of the lower container cause the molten asphalt to flow into the lower container through a narrow and long permeable gap between the containers. The bubbles in it continuously break under the dual action of stretching and deforming along with the thin stream of asphalt and the air pressure difference inside and outside the bubbles, and are discharged by vacuum pump suction. However, it has the following deficiencies: Although it utilizes the advantage that the narrow and long permeable gap can cause the bubbles to break under the action of stretching and deforming along with the thin stream of asphalt, it does not avoid the disadvantages of the narrow and long permeable gap being blocked and hindering the flow of asphalt liquid. First, the existence of the narrow and long permeable gap will lead to insufficient fluidity of asphalt, and this insufficient fluidity will further result in a low efficiency of asphalt defoaming. Second, the device does not design a gap cleaning device corresponding to the narrow and long permeable gap. Therefore, when the narrow and long permeable gap is blocked, the device will have problems such as a reduction in the efficiency of asphalt bubble removal and difficulty in cleaning the blocked part of the narrow and long permeable gap. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a device for removing bubbles in asphalt by rotary centrifugation, which has the advantage of avoiding partial asphalt aging caused by overlong high-temperature heating, and solves the problems of low efficiency of asphalt defoaming and gap blockage.

[0006] To achieve the above object, the utility model provides a device for removing air bubbles in asphalt by rotary centrifugation, which comprises a housing, an asphalt feed inlet and a vacuum pump interface. The asphalt feed inlet and the vacuum pump interface are respectively installed at the left and right ends of the top of the housing. The device further comprises a rotating shaft, a cleaning device for the inner wall of the housing and a rotary centrifugal device;

[0007] The rotary centrifugal device is provided with an umbrella-shaped structure at the bottom; the rotating shaft is integrally connected with the rotary centrifugal device, the umbrella-shaped structure and the cleaning device for the inner wall of the housing from top to bottom and rotates together; the cleaning device for the inner wall of the housing is closely attached to the inner wall of the housing.

[0008] Among them, the rotary centrifugal device is composed of a cleaning device for the rotary centrifugal device, a disc-shaped bottom plate and a housing of the rotary centrifugal device.

[0009] Among them, the housing of the rotary centrifugal device is formed by placing 200 identical slender cylinders in a hoop and inserting them into the disc-shaped bottom plate at equal intervals; the equal intervals between the slender cylinders form the gaps around the rotary centrifugal device.

[0010] Among them, a circular gap is arranged at the bottom of the disc-shaped bottom plate area of the rotary centrifugal device. The size of the circular gap at the bottom of the rotary centrifugal device gradually increases from the center to the outside, and the size of the circular gap at the bottom of the rotary centrifugal device is ensured to be between 1 and 3 mm.

[0011] Among them, a brush of the cleaning device for the rotary centrifugal device is installed at the part where the cleaning device for the rotary centrifugal device contacts the housing of the rotary centrifugal device.

[0012] A device for removing bubbles in asphalt by rotary centrifugation according to the present utility model, designed by the above technical solution, can enable the asphalt after the first bubble removal by the rotary centrifugation device to enter the umbrella-shaped structure from the bottom and enter the inner wall of the outer shell from the periphery of the rotary centrifugation device respectively. Then, under the rotation of the rotating shaft, the inner wall cleaning device of the outer shell and the umbrella-shaped structure are driven to rotate, so that the asphalt coming out of the rotary centrifugation device quickly spreads over the umbrella-shaped structure and the inner wall of the outer shell, making the bubbles in the asphalt quickly exposed and burst under the action of the air pressure difference in the vacuum low-pressure environment. Moreover, the asphalt covering the inner wall of the outer shell will be continuously squeezed and deformed due to the continuous rotation of the inner wall cleaning device of the outer shell, so that the bubbles in the asphalt will also burst due to extrusion. During this process, the burst bubbles will be pumped out of the device by the vacuum pump. That is to say, during this process, the asphalt will be subjected to the second bubble removal under the dual actions of the bubbles being exposed in the vacuum low-pressure environment and the continuous rotation of the inner wall cleaning device of the outer shell squeezing the bubbles. The hollow umbrella-shaped structure at the lower part of the outer shell can collect the asphalt after the second bubble removal. Compared with the prior art, most of the existing bubble removal technologies are for removing bubbles from asphalt in a static state or with a slow movement. The disadvantage of this traditional method is that the bubble removal time is too long and the removal is not thorough, because it is very difficult for the bubbles inside the asphalt in a static state to rise to the surface of the asphalt for removal. And this device and method are for removing bubbles from asphalt in a flowing state. Compared with the traditional static long-time high-temperature heating, the asphalt in this device and method is in a flowing state, so there is no need for long-time high-temperature heating, thus avoiding the problem of partial asphalt aging. Moreover, this device and method can also adjust the time of the asphalt existing in the device by controlling the rotation speed of the rotating shaft, so as to control the speed of asphalt bubble removal. And it also solves the disadvantage that bubbles are easily generated again during bubble removal in a flowing state. The bubbles generated during the process of the asphalt being centrifuged out of the rotary centrifugation device and extruded to the inner wall of the outer shell will be removed during the second bubble removal. Therefore, this device and method not only retain the advantages of strong fluidity and not easy to age in removing bubbles in a flowing state, but also avoid the disadvantage of bubbles being generated again during bubble removal in a flowing state. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art.

[0014] Figure 1 FIG. is a front sectional structure schematic diagram of the whole device for removing bubbles in asphalt by rotary centrifugation according to the present utility model.

[0015] Figure 2 FIG. is a three-dimensional perspective view of the outer shell of the rotary centrifugation device according to the present utility model.

[0016] Figure 3 This is the top view of the housing of the rotary centrifugal device of the present utility model.

[0017] Figure 4 This is the three-dimensional view of the inner wall cleaning device of the housing of the present utility model.

[0018] Figure 5 This is the three-dimensional view of the cleaning device of the rotary centrifugal device of the present utility model.

[0019] In the figure: 1 - housing; 2 - asphalt feed port; 3 - vacuum pump interface; 4 - rotating shaft; 5 - inner wall cleaning device of the housing; 6 - disc-shaped bottom plate; 7 - slender cylinder; 8 - circular gap at the bottom of the rotary centrifugal device; 9 - cleaning device of the rotary centrifugal device; 10 - brush of the cleaning device of the rotary centrifugal device; 11 - umbrella-shaped structure; 12 - umbrella-shaped structure at the bottom of the housing; 13 - hoop; 14 - asphalt discharge port; 15 - peripheral gap of the rotary centrifugal device; 16 - rotary centrifugal device; 17 - housing of the rotary centrifugal device. Detailed implementation manners

[0020] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present utility model, and should not be construed as limiting the present utility model.

[0021] The first embodiment of the present application is as follows:

[0022] Please refer to Figures 1 to 5 , wherein Figure 1 is the front sectional structure schematic diagram of the whole device for removing air bubbles in asphalt by rotary centrifugation, Figure 2 is the three-dimensional view of the housing 17 of the rotary centrifugal device, Figure 3 is the top view of the housing 17 of the rotary centrifugal device, Figure 4 is the three-dimensional view of the inner wall cleaning device 5 of the housing, Figure 5 is the three-dimensional view of the cleaning device 9 of the rotary centrifugal device.

[0023] The present utility model provides a device for removing air bubbles in asphalt by rotary centrifugation: The rotary centrifugal device 16 includes the rotating shaft 4, the cleaning device 9 of the rotary centrifugal device, the disc-shaped bottom plate 6 and the housing 17 of the rotary centrifugal device; an umbrella-shaped structure 11 is installed at the bottom of the rotary centrifugal device 16; the rotating shaft 4 is integrally connected with the rotary centrifugal device 16, the umbrella-shaped structure 11 and the inner wall cleaning device 5 from top to bottom and rotates together; the device further includes a housing 1, and the asphalt feed port 2 and the vacuum pump interface 3 are respectively installed at the left and right ends of the top of the housing 1.

[0024] In the design of the above technical solution, first, through the rotation centrifugal device 16, the asphalt that has been heated to a flowing state can be subjected to gas-liquid separation under the action of centrifugal force, so that the first degassing of asphalt is carried out under the triple action of centrifugal force, the air pressure difference of the evacuated low-pressure environment, and the extrusion and deformation of the bubbles in the asphalt by the gaps on the rotation centrifugal device 16. And the cleaning device 5 for the inner wall of the housing, the umbrella-shaped structure 11 installed at the bottom of the rotation centrifugal device 16, and the umbrella-shaped design at the bottom of the housing 1 can carry out the second degassing of asphalt and the aggregated and dispersed asphalt.

[0025] As a further improvement of the present utility model, the rotation centrifugal device housing 17 is composed of a large number of the same-sized slender cylinders 7, a disc-shaped bottom plate 6, and a hoop 13; there are a plurality of circular gaps 8 at the bottom of the rotation centrifugal device in the disc-shaped bottom plate 6, and the width of the circular gaps gradually widens from the center of the circle to the outside of the circle; the slender cylinders 7 are arranged at equal intervals of 1 mm to 3 mm and inserted into the radius edge of the disc-shaped bottom plate 6; the hoop 13 has a large number of holes corresponding to the slender cylinders 7, so that the slender cylinders 7 can be inserted into the hoop 13 to form a whole.

[0026] As a further improvement of the present utility model, the rotation centrifugal device housing 17 can set the radius and thickness of the disc-shaped bottom plate 6 according to the used scenario and the amount of asphalt to be removed. After setting the radius of the disc-shaped bottom plate 6, the radius of the slender cylinder 7 can first take a size that can leave a narrow gap by using the radius of the disc-shaped bottom plate 6; the hoop 13 can be further set according to the size of the slender cylinder 7; the height of the rotation centrifugal device housing 17 is several times the radius of the disc-shaped bottom plate 6.

[0027] As a further improvement of the present utility model, the rotation centrifugal device cleaning device 9 is a cuboid with a length equal to the radius of the disc-shaped bottom plate 6, a width equal to the diameter of the rotating shaft 4, and a height equal to the height of the rotation centrifugal device housing 17. And small rotation centrifugal device cleaning device brushes 10 are installed at the contact between this device and the rotation centrifugal device housing 17, and this device is driven by the rotating shaft 4 to rotate inside the rotation centrifugal device housing 17.

[0028] Through the design of the above technical solution, the asphalt that has been heated to a flowing state is separated into gas and liquid under the action of the centrifugal force generated by the rotation of the rotating shaft 4. Due to the density difference between gas and liquid, most of the gas is concentrated near the center of the circle, and most of the liquid is near the outer periphery of the circle. For this reason, the size of the circular gap at the bottom needs to increase gradually from the center of the circle radially outward, so that it is more difficult for the gas in the middle to overflow from the rotating centrifugal device 16. At the same time, it also allows the asphalt at the bottom to enter the umbrella-shaped structure 11 from the rotating centrifugal device 16 for secondary degassing. The gaps formed by small cylinders around the outer shell 17 of the rotating centrifugal device are evenly distributed, so that most of the asphalt separated by the centrifugal force can squeeze through these narrow gaps under the action of the centrifugal force. The existence of the cleaning device 9 of the rotating centrifugal device is provided to prevent the asphalt from blocking the gaps. When the rotating shaft 4 rotates continuously, the brush on this device can continuously wash the gaps around and at the bottom. This device not only provides the required centrifugal force for the asphalt but also continuously cleans the gaps to solve the problem of gap blockage. That is, when the asphalt passes through the rotating centrifugal device 16, it undergoes the first degassing under the triple action of centrifugal force, extrusion by the small gaps, and the air pressure difference in the vacuum low-pressure environment. Then, the ruptured bubbles will be continuously evacuated from the inside of the device under the vacuum pumping action of the vacuum pump.

[0029] As a further improvement of the present utility model, the outer shell 1 is composed of an upper hollow cylinder and a lower hollow umbrella-shaped structure.

[0030] As a further improvement of the present utility model, the cleaning device on the inner wall of the outer shell 1 not only closely adheres to the inner wall of the outer shell 1 but also is connected to the rotating centrifugal device 16 as a whole through the rotating shaft 4 and rotates together.

[0031] As a further improvement of the present utility model, the umbrella-shaped structure 11 is located below the bottom of the outer shell 17 of the rotating centrifugal device and is connected to the rotating shaft 4 as a whole and rotates together.

[0032] Through the design of the above technical solution, the asphalt after the first degassing by the rotary centrifugal device 16 can enter the umbrella-shaped structure 11 from the bottom and enter the inner wall of the outer shell 1 from the periphery of the rotary centrifugal device 16 respectively. Then, under the rotation of the rotating shaft 4, the inner wall cleaning device 5 of the outer shell and the umbrella-shaped structure 11 are driven to rotate, so that the asphalt coming out of the rotary centrifugal device 16 quickly covers the umbrella-shaped structure 11 and the inner wall of the outer shell 1, making the bubbles in the asphalt quickly exposed and burst under the action of the air pressure difference in the vacuum low-pressure environment. Moreover, the asphalt covering the inner wall of the outer shell 1 will be continuously squeezed and deformed due to the continuous rotation of the inner wall cleaning device 5 of the outer shell, so that the bubbles in the asphalt will also burst due to extrusion. During this process, the burst bubbles will be pumped out of the device interior by the vacuum pump. That is, during this process, the asphalt will be degassed for the second time under the dual action of the bubbles being exposed to the vacuum low-pressure environment and the continuous rotation of the inner wall cleaning device 5 of the outer shell squeezing the bubbles. The hollow umbrella-shaped structure in the lower part of the outer shell 1 can collect the asphalt after the second degassing is completed.

[0033] Most of the existing degassing technologies are for degassing asphalt in a static state or moving slowly. The disadvantage of this traditional method is that the degassing time is too long and the degassing is not thorough, because it is very difficult for the bubbles inside the asphalt to rise to the surface of the asphalt for removal when the asphalt is in a static state. However, this device and method are for removing bubbles when the asphalt is in a flowing state. Compared with the traditional static long-time high-temperature heating, the asphalt in this device and method is in a flowing state, so there is no need for long-time high-temperature heating, thus avoiding the problem of partial asphalt aging. Moreover, this device and method can also adjust the time that the asphalt exists in the device by controlling the rotation speed of the rotating shaft 4, so as to control the degassing speed of the asphalt, and also solve the disadvantage that bubbles are likely to be generated again during degassing in a flowing state. When the bubbles generated during the process of the asphalt being extruded from the rotary centrifugal device 16 to the inner wall of the outer shell 1 are removed during the second degassing, so this device and method not only retain the advantages of strong fluidity and not easy to age when removing bubbles in a flowing state, but also avoid the disadvantage of bubbles being generated again during degassing in a flowing state.

[0034] This device and method are designed with a cleaning device corresponding to the gap. Such a design solves the problem of blockage that occurs in the gap during the degassing of asphalt, and at the same time drives the asphalt to rotate and generate centrifugal force during the first degassing of asphalt.

[0035] A corresponding asphalt collection device, that is, the outer wall and inner wall cleaning device, is designed for the degassing of the rotary centrifugal device 16. Because the asphalt centrifuged out by the rotary centrifugal device is scattered, the designed device can quickly collect the scattered asphalt and at the same time quickly cover the inner wall with the asphalt, making the bubbles exposed to the vacuum low-pressure environment, thus also playing the role of the second degassing.

[0036] When using a device for removing air bubbles in asphalt by rotary centrifugation, first heat the asphalt to be de-bubbled to a temperature above the softening point of the asphalt and simultaneously open Figure 1 the vacuum pump interface 3 described in to evacuate the inside of the device to create a low-pressure environment, and maintain the pressure between 1 KPa and 45 KPa. When the temperature and pressure reach the requirements, open Figure 1 the asphalt inlet 2 of to allow the flowing asphalt to enter the rotary centrifugal device 16. After the flowing asphalt liquid enters the rotary centrifugal device 16 from the asphalt inlet 2, since the rotating shaft 4 drives the rotary centrifugal device cleaning device 9 to rotate, and then the rotary centrifugal device cleaning device 9 drives the flowing asphalt to rotate. During the rotation of the asphalt, centrifugal force is generated, causing the asphalt to start gas-liquid separation. Most of the gas accumulates near the center of the circle, while most of the liquid is located away from the center of the circle. In this process, a preliminary bubble separation is carried out. After the gas-liquid separation, the asphalt near the gaps 15 around the rotary centrifugal device will be extruded out of the gaps 15 around the rotary centrifugal device under the action of centrifugal force, and the asphalt near the bottom will be extruded out of the circular gap 8 at the bottom of the rotary centrifugal device under the dual action of gravity and the rotation of the rotary centrifugal device cleaning device 9. That is, the first de-bubbling of the asphalt is completed under the triple action of centrifugal force, gap extrusion, and vacuum low-pressure environment. When the asphalt that has completed the first de-bubbling is extruded from the circular gap 8 at the bottom of the rotary centrifugal device and the gaps 15 around the rotary centrifugal device and falls onto the umbrella-shaped structure 11 and the inner wall of the housing 1, since the umbrella-shaped structure 11 and the inner wall cleaning device 5 of the housing are connected to the rotating shaft 4 as a whole, the umbrella-shaped structure 11 and the inner wall cleaning device 5 of the housing will also rotate with the rotation of the rotating shaft 4. Therefore, the asphalt on the umbrella-shaped structure 11 and the inner wall of the housing 1 will quickly cover the entire umbrella-shaped structure 11 and the inner wall of the housing 1, that is, the bubbles in the asphalt will be quickly exposed to the vacuum low-pressure environment, and the bubbles will naturally burst under the action of the pressure difference. That is, the second de-bubbling of the asphalt is completed under the triple action of the vacuum low-pressure environment, the exposure of the bubbles in the asphalt, and the rotation and extrusion of the inner wall cleaning device 5 of the housing.

[0037] The above disclosure is only one or more preferred embodiments of the present application, and cannot be used to limit the scope of rights of the present application. Those of ordinary skill in the art can understand the entire or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present application still fall within the scope covered by the present application.

Claims

1. A device for removing air bubbles in asphalt by rotary centrifugation, comprising a housing (1), an asphalt inlet (2) and a vacuum pump interface (3). The asphalt inlet (2) and the vacuum pump interface (3) are respectively installed at the left and right ends of the top of the housing (1). It is characterized in that, it further comprises a rotating shaft (4), a housing inner wall cleaning device (5) and a rotary centrifugal device (16); The rotary centrifugal device (16) is provided with an umbrella-shaped structure (11) at the bottom; the rotating shaft (4) is integrally connected with the rotary centrifugal device (16), the umbrella-shaped structure (11) and the housing inner wall cleaning device (5) from top to bottom and rotates together; the housing inner wall cleaning device (5) is in close contact with the inner wall of the housing (1).

2. The device for removing air bubbles in asphalt by rotary centrifugation according to claim 1, characterized in that, The rotary centrifugal device (16) is composed of a rotary centrifugal device cleaning device (9), a disc-shaped bottom plate (6) and a rotary centrifugal device housing (17).

3. The device for removing air bubbles in asphalt by rotary centrifugation according to claim 2, characterized in that, The rotary centrifugal device housing (17) is formed by placing 200 identical slender cylinders (7) in a hoop (13) and inserting them into the disc-shaped bottom plate (6) at equal intervals; equal intervals between the slender cylinders (7) form the circumferential gap (15) around the rotary centrifugal device.

4. The device for removing air bubbles in asphalt by rotary centrifugation according to claim 2, characterized in that, The rotary centrifugal device bottom circular gap (8) is provided in the area of the disc-shaped bottom plate (6), and the size of the rotary centrifugal device bottom circular gap (8) gradually increases in the direction from the center to the outside, and the size of the rotary centrifugal device bottom circular gap (8) is ensured to be between 1 and 3 mm.

5. The device for removing air bubbles in asphalt by rotary centrifugation according to claim 2, characterized in that, The part of the rotary centrifugal device cleaning device (9) in contact with the rotary centrifugal device housing (17) is equipped with a rotary centrifugal device cleaning device brush (10).

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