Environment-friendly asphalt stirring device used in laboratory

Abstract

The utility model belongs to the technical field of road material test instruments, and relates to an environment-friendly asphalt stirring device used in a laboratory. Comprising a base, supporting legs, a heating tank body, a heating pipe, a temperature sensor, a sample containing table, an exhaust fume collecting hood, a main bracket, a transverse connecting bracket, an electric stirrer, a connecting rod, stirring blades, a pipeline, an air circulation purification device and a controller, the supporting legs are arranged at the bottom of the base; the heating tank body is arranged at the top of the base; one ends of the heating pipe and the temperature sensor are arranged in the heating tank body, and the other ends extend out of the heating tank body and are electrically connected with the controller; a sample containing table is arranged in the heating tank body; a first cavity is formed by the heating tank body and the sample containing table; an exhaust fume collecting hood is arranged above the heating tank body; the sample containing table and the exhaust fume collecting hood form a second cavity; accurate control over the stirring temperature and the stirring speed in the stirring process is achieved, and asphalt smoke generated in the heating and stirring process can be effectively treated.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the road material testing instrument technical field relates to a laboratory uses environmental protection type asphalt mixing device. BACKGROUND

[0002] In the field of road engineering materials, modified asphalt is one of the important contents of research. Generally, modified asphalt is prepared by adding new modifiers to base asphalt. During the preparation of modified asphalt, asphalt usually needs to be heated to a high temperature (about 170 DEG C or more) to achieve a more optimal flow state and better compatibility with the modifier. Higher asphalt heating temperature will produce asphalt smoke with irritating odor, which is harmful to the health of test personnel. Although the form of wearing a gas mask can be used to filter asphalt smoke during preparation, asphalt smoke is not only harmful to the respiratory system of personnel, but also has a certain impact on the skin contact of test personnel. In addition, during the laboratory test process, all test personnel cannot always wear gas masks. Although a central ventilation device or a test table with a smoke hood can be installed in the laboratory to reduce the impact of asphalt smoke during asphalt mixing, the above equipment cannot be installed in time for the field laboratory in the relatively simple engineering. In general, the existing asphalt mixing device in the laboratory is generally open, and the treatment of asphalt smoke during mixing is not considered. From the perspective of ensuring the health and safety of test personnel, an environmental protection type asphalt mixing device for laboratory use is urgently needed to accurately control the mixing temperature and mixing speed during mixing, and effectively treat the asphalt smoke generated during heating and mixing. CONTENT OF THE UTILITY MODEL

[0003] The utility model discloses a laboratory uses environmental protection type asphalt mixing device, realizes the accurate control of mixing temperature, mixing speed during mixing, and can effectively handle the asphalt smoke generated during heating and mixing.

[0004] To achieve the above object, the utility model adopts the following technical scheme to realize it:

[0005] The utility model provides a laboratory uses environmental protection type asphalt stirring device, including base, support leg, heating jar body, heating tube, temperature sensor, sample table, fume hood, main support, transverse connecting support, electric mixer, connecting rod, stirring vane, pipeline, air circulation purification device and controller, the support leg sets up at the base bottom, the heating jar body sets up at the base top, heating tube and temperature sensor all one end set up in heating jar body inside, the other end extends heating jar body and the controller electric connection, the heating jar body inside is provided with sample table, the heating jar body and sample table form first cavity, the heating jar body top is provided with fume hood, the sample table and fume hood form second cavity, fume hood passes through pipeline and air circulation purification device connection, the base top is provided with main support, the transverse connecting support one end slidingly sets up on main support, and the other end is connected with electric mixer, the connecting rod one end is connected with electric mixer, and the other end is provided with stirring vane and extends to the inside of second cavity, and electric mixer and controller electric connection.

[0006] Preferably, the upper surface of the base is inlaid with a disc-shaped bubble level device.

[0007] Preferably, the support leg is a spiral support leg.

[0008] Preferably, the transverse connecting support is slidingly arranged on the main support through a limiting adjuster.

[0009] Preferably, the main support is provided with a main support rack, the transverse connecting support is provided with a transverse connecting support rack, and the main support and the transverse connecting support are connected through the main support rack and the transverse connecting support rack.

[0010] Preferably, the fume hood comprises a first fume hood and a second fume hood connected thereto, a through hole is arranged between the first fume hood and the second fume hood, the connecting rod passes through the through hole, and sealing pads are arranged on both sides of the through hole.

[0011] Preferably, the sealing pads are made of rubber.

[0012] Preferably, the air circulation purification device comprises a first power control key, an air purification module, and an air circulation pump, and the first power control key is electrically connected with the air purification module and the air circulation pump, respectively.

[0013] Preferably, the pipeline comprises a first pipeline and a second pipeline; the first air outlet and the first air inlet are arranged on the surface of the fume hood; the first air outlet is located above the first air inlet; the second air outlet and the second air inlet are arranged on the surface of the air circulation purification device; the second air inlet is located above the second air outlet; the first air outlet and the second air inlet are connected through the first pipeline; and the first air inlet and the second air outlet are connected through the second pipeline.

[0014] Preferably, the controller is provided with a second power control key, a temperature display screen, a rotating speed display screen, a time display screen and a controller parameter adjustment key; and the second power control key is electrically connected with the temperature display screen, the rotating speed display screen, the time display screen and the controller parameter adjustment key.

[0015] Compared with the prior art, the utility model has the advantages of the following:

[0016] The utility model discloses a controller is monitored to temperature and stirring speed, and according to the monitoring result is controlled to heating pipe and electric mixer, realizes the accurate control of stirring temperature and stirring speed in the stirring process, through the fume hood is collected to the asphalt smoke generated in the asphalt stirring process, uses the air circulation purification device to purify the asphalt smoke, and the purified air is recycled to the fume hood, avoids the leakage of flue gas, and effectively guarantees the health safety of the test personnel. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will be to the drawing needed in the embodiment used briefly introduces, should understand, the following drawing only shows some implementation of the utility model of the embodiment, therefore should not be seen as the limitation of the scope, for the ordinary skilled person in the art comes, under the premise of not paying the creative labor, can also obtain other related drawings according to these drawings.

[0018] Figure 1 It is the front view of the environment-friendly asphalt mixing device for laboratory use of the utility model;

[0019] Figure 2 It is the side view of the environment-friendly asphalt mixing device for laboratory use of the utility model;

[0020] Figure 3 It is the overhead view of the base in the environment-friendly asphalt mixing device for laboratory use of the utility model;

[0021] Figure 4 It is the overhead view of the main support and the transverse connecting support structure in the environment-friendly asphalt mixing device for laboratory use of the utility model;

[0022] Figure 5The utility model discloses a side view of main support and transverse connecting support structure in the environment -friendly asphalt stirring device of laboratory use.

[0023] Figure 6 The utility model discloses a schematic diagram of fume collecting cover structure in the environment -friendly asphalt stirring device of laboratory use.

[0024] Figure 7 The utility model discloses a schematic diagram of fume collecting cover structure in the environment -friendly asphalt stirring device of laboratory use.

[0025] Figure 8 The utility model discloses a schematic diagram of air circulation purification device structure in the environment -friendly asphalt stirring device of laboratory use.

[0026] Figure 9 The utility model discloses a schematic diagram of controller structure in the environment -friendly asphalt stirring device of laboratory use.

[0027] Among them: 1, base, 2, support leg, 3, heating jar body, 4, heating tube, 5, temperature sensor, 6, sample table, 7, fume collecting cover, 71, sealing gasket, 8, main support, 81, main support rack, 9, transverse connecting support, 91, transverse connecting support rack, 10, electric mixer, 11, connecting rod, 12, stirring vane, 13, pipeline, 14, air circulation purification device, 141, first power control key, 142, air purification module, 143, air circulation pump, 15, controller, 151, second power control key, 152, temperature display screen, 153, speed display screen, 154, time display screen, 155, controller parameter adjustment button, 16, limit adjuster, 17, disc type air bubble level device. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantage of the embodiments of the utility model more clear, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model, obviously, the described embodiments are a part of the embodiments of the utility model, not all the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the utility model.

[0030] It should be noted that like reference numerals and letters refer to like items in the several views, and once an item is defined in one view, it should not require further defining and explaining in the subsequent views.

[0031] In the description of the embodiments of the present application, it should be noted that if the terms "upper", "lower", "horizontal", "inner" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship of the present application product in use, only for the convenience of describing the present application and simplifying the description, and it does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0032] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0033] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, if the terms "set", "mount", "connected", "connected" appear, they should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] The present application will be described in further detail below in conjunction with the accompanying drawings:

[0035] The present application provides an environmentally friendly asphalt mixing device for laboratory use, such as Figure 1 and Figure 3As shown, including base 1, leg 2, heating tank 3, heating pipe 4, temperature sensor 5, sample table 6, smoke hood 7, main support 8, transverse connecting support 9, electric mixer 10, connecting rod 11, stirring blade 12, pipeline 13, air circulation purification device 14 and controller 15; The leg 2 is arranged at the bottom of the base 1; The heating tank 3 is arranged at the top of the base 1; The heating pipe 4 and the temperature sensor 5 are arranged inside the heating tank 3, and the other end extends out of the heating tank 3 and is electrically connected with the controller 15; The heating tank 3 is provided with a sample table 6; The heating tank 3 and the sample table 6 form a first cavity; The heating tank 3 is provided with a smoke hood 7 above; The sample table 6 and the smoke hood 7 form a second cavity; The smoke hood 7 is connected with the pipeline 13 and the air circulation purification device 14; The top of the base 1 is provided with a main support 8; One end of the transverse connecting support 9 is slidably arranged on the main support 8, and the other end is connected with the electric mixer 10; One end of the connecting rod 11 is connected with the electric mixer 10, and the other end is provided with the stirring blade 12 and extends into the second cavity; The electric mixer 10 is electrically connected with the controller 15.

[0036] The base 1 serves as the basic support structure of the entire device, ensuring the stability and reliability of the device. The legs 2 not only strengthen the load-bearing capacity of the base 1, but also enable the device to be stably placed on the ground, preventing shaking or tilting during operation. The material of the heating tank 3 is selected to have good heat resistance and corrosion resistance, ensuring that the structure remains intact and the function remains stable under long-term high-temperature working conditions. The heating pipe 4 is used to heat the asphalt sample inside the heating tank 3 to the required test temperature. The temperature sensor 5 can monitor the temperature inside the heating tank 3 in real time and feed back the data to the controller 15, so as to realize precise control of the heating process and avoid overheating or insufficient temperature. The sample holding platform 6 is arranged inside the heating tank 3 and is used to place the asphalt sample, facilitating heating and stirring operations. The fume hood 7 effectively captures the smoke and harmful gases generated during heating and stirring, preventing their spread into the test room and protecting the health of test personnel. The main support 8 serves as the support structure of the electric mixer 10, ensuring that the electric mixer 10 can work stably. One end of the transverse connecting support 9 is slidingly arranged on the main support 8, and the position of the electric mixer 10 can be adjusted as needed to better adapt to heating tanks and asphalt samples of different sizes. The electric mixer 10 provides power to drive the stirring blades 12 inside the heating tank 3 through the connecting rod 11, ensuring that the asphalt sample can be uniformly heated and mixed. The pipeline 13 transports the smoke and harmful gases collected by the fume hood 7 to the air circulation purification device 14 for treatment, effectively removing harmful substances in the smoke and harmful gases and ensuring that the air discharged into the test room meets environmental protection requirements. The heating pipe 4, temperature sensor 5, and electric mixer 10 in the heating tank 3 are electrically connected to the controller 15 through wired or wireless means. The controller 15 controls whether the heating pipe 2 works by determining whether the heating temperature reaches the designed temperature through the temperature sensor 5. At the same time, the controller 15 can adjust the stirring speed of the electric mixer 10.

[0037] The legs 2 are spiral legs that can adjust the distance between the base 1 and the ground and horizontally adjust the base 1. At the same time, the upper surface of the base 1 is inlaid with a disc-type bubble level device 17 for observing whether the base 1 is level.

[0038] For example, the base 1 is rectangular, and the number of legs 2 is four, which are arranged at the four corners of the rectangle.

[0039] The sample holding platform 6 and the heating tank 3 are detachable structures that are connected to each other by screw anchoring, facilitating the pouring of the asphalt sample after the completion of the stirring.

[0040] The smoke hood 7 is connected with the heating tank body 3 in the form of screw anchoring, and forms a whole stirring space and smoke collecting space with the sample holding table 6 and the heating tank body 3, i.e. the second cavity.

[0041] The first fixing hole is arranged at the edge of the sample holding table 6, the second fixing hole is arranged at the edge of the smoke hood 7, and the preformed hole is arranged in the heating tank body 3. The sample holding table 6, the smoke hood 7 and the heating tank body 3 are fixed by the screw passing through the fixing holes and the preformed hole in the heating tank body 3.

[0042] As shown in Figure 2 and Figure 4 , the transverse connecting bracket 9 is slidably arranged on the main bracket 8 through the limiting adjuster 16. The transverse connecting bracket 9 is hollowly sleeved on the main bracket 8, the limiting adjuster 16 is connected with the transverse connecting bracket 9 through the drilled hole, the threaded structure is adopted in the drilled hole, and the limiting adjuster 16 is longitudinally adjusted to the position of the transverse connecting bracket 9 on the main bracket 8 in the threaded rotation mode.

[0043] As shown in Figure 5 , the main bracket 8 is provided with the main bracket rack 81; the transverse connecting bracket 9 is provided with the transverse connecting bracket rack 91; and the main bracket 8 and the transverse connecting bracket 9 are connected through the rack meshing of the main bracket rack 81 and the transverse connecting bracket rack 91, so that the transverse connecting bracket 9 is fixed at the height of the main bracket 8.

[0044] As shown in Figure 6 and Figure 7 , the smoke hood 7 comprises a first smoke hood and a second smoke hood connected with the first smoke hood; the first smoke hood and the second smoke hood are provided with a through hole (preferably a concave opening); the both sides of the through hole are provided with the sealing gasket 71; and the material of the sealing gasket 71 is rubber.

[0045] As shown in Figure 8 , the air circulation and purification device 14 comprises a first power control key 141, an air purification module 142 and an air circulation pump 143; and the first power control key 141 is electrically connected with the air purification module 142 and the air circulation pump 143 respectively.

[0046] The pipeline 13 comprises a first pipeline and a second pipeline; the air exhaust hood 7 is provided with a first air outlet and a first air inlet on the surface thereof; the first air outlet is located above the first air inlet; the air circulation purification device 14 is provided with a second air outlet and a second air inlet on the surface thereof; the second air inlet is located above the second air outlet; the first air outlet and the second air inlet are connected through the first pipeline; and the first air inlet and the second air outlet are connected through the second pipeline. The pipeline 13 is of a detachable structure, and the connection between the pipeline 13 and the air outlet and the air inlet is of a buckle connection, and the connection position is sealed to prevent air leakage.

[0047] As shown in Figure 9 The controller 15 is provided with a second power control key 151, a temperature display screen 152, a rotating speed display screen 153, a time display screen 154 and a controller parameter adjustment key 155; the second power control key 151 is electrically connected with the temperature display screen 152, the rotating speed display screen 153, the time display screen 154 and the controller parameter adjustment key 155 respectively. The temperature display screen 152 can display the temperature inside the first cavity in real time, so that the user can intuitively understand the current working state. The rotating speed display screen 153 can display the rotating speed of the electric mixer 10 in real time, so that the user can understand the dynamic change of the mixing process. By monitoring the rotating speed, the user can adjust the mixing speed according to the need, so as to optimize the mixing effect and ensure that the asphalt sample can be uniformly mixed.

[0048] Embodiment

[0049] During the operation, first, adjust the supporting leg 2, adjust the equipment base 1 to the horizontal position through the disc type bubble level device 17; fill the designed capacity of the heat conduction oil in the heating tank body 3, place the sample holding table 6 in the heating tank body 3, and form the heat conduction oil heating area (corresponding to the first cavity) between the sample holding table 6 and the heating tank body 3; place the asphalt sample in the sample holding table 6, open the second power control key 151 in the controller 15, set the heating temperature through the controller parameter adjustment button 155, control whether the heating pipe 4 is in the heating state, and use the temperature sensor 5 to monitor the heating temperature that the heat conduction oil can reach, to control whether the heating pipe 4 needs to be further heated; after the asphalt in the sample holding table 6 is heated to a flowing state, adjust the limit adjuster 16 to make the main support 8 and the transverse connecting support 9 have an up-down moving space, move the up-down position of the transverse connecting support 9, so that the stirring blade 12 is located in the asphalt to be stirred, then adjust the limit adjuster 16 to make the main support rack 81 and the transverse connecting support rack 91 mesh with each other, to fix the transverse connecting support 9 so that it cannot move up and down; pass the concave opening in the smoke collecting hood 7 through the connecting rod 11, and make the second fixing hole of the smoke collecting hood 7 correspond to the first fixing hole of the sample holding table 6 and the reserved hole in the heating tank body 3, and use the screw anchoring form to fix the smoke collecting hood 7, the sample holding table 6 and the heating tank body 3; connect the first air outlet hole of the smoke collecting hood 7 with the second air inlet hole of the air circulation purification device 14 through the first pipeline, and connect the first air inlet hole of the smoke collecting hood 7 with the second air outlet hole of the air circulation purification device 14 through the second pipeline, the connection mode is buckle connection, and the position of the connection port is sealed to prevent air leakage; open the first power control key 141 in the air circulation purification device 14, so that the air purification module 142 and the air circulation pump 143 are in the working state; set the stirring speed and stirring time of the electric mixer 10 through the controller parameter adjustment button 155 in the controller 15, and start the stirring work of the asphalt; when the additive is added to the asphalt to prepare modified asphalt during the stirring process, the second power control key 151 of the controller 15 and the first power control key 141 of the air circulation purification device 14 need to be closed, the screws between the heating tank body 3, the sample holding table 6 and the smoke collecting hood 7 are unfastened, the smoke collecting hood 7 is opened, the additive is added to the asphalt, then the heating tank body 3, the sample holding table 6 and the smoke collecting hood 7 are fixed again through the screw anchoring form, the second power control key 151 of the controller 15 and the first power control key 141 of the air circulation purification device 14 are opened, and the stirring process of the modified asphalt is realized.After the stirring time is reached, the second power control key 151 of the controller 15 and the first power control key 141 of the air circulation purification device 14 are closed, the screws between the heating tank body 3, the sample table 6 and the smoke collecting cover 7 are unscrewed, the smoke collecting cover 7 is opened, the limiting adjuster 16 is adjusted, the engagement state between the main support rack 81 and the transverse connecting support rack 91 is disengaged, the position of the transverse connecting support 9 is raised, the stirring blade 12 is separated from the asphalt, then the limiting adjuster 16 is adjusted to engage and fix the main support rack 81 and the transverse connecting support rack 91 again, the asphalt on the surface of the stirring blade 12 is cleaned by using a cleaning cloth, then the anti-scalding gloves are worn, the sample table 6 is taken out from the heating tank body 3, the prepared modified asphalt sample is obtained, used for preparing an asphalt test sample, and the performance of the prepared modified asphalt is tested; after the asphalt stirring test is completed, the connection state between the pipe 13, the smoke collecting cover 7 and the air circulation purification device 14 is disengaged, and the equipment is neatly placed back to the original position.

[0050] The above operation realizes the collection and purification of asphalt smoke in the asphalt stirring process, effectively avoids the outflow of asphalt smoke under the condition of high-temperature stirring asphalt, ensures the health and safety of the test personnel, the device is small and convenient to use in the laboratory, avoids the problem of a large amount of funds required for installing a ventilation device in the laboratory, and has good economic benefits.

[0051] The above only for the preferred embodiments of the present application, and not for limiting the present application, for those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A laboratory environment-friendly asphalt mixing device, characterized in that, The utility model provides a kind of heating device, including base (1), support leg (2), heating tank (3), heating pipe (4), temperature sensor (5), sample table (6), fume hood (7), main support (8), transverse connecting support (9), electric mixer (10), connecting rod (11), stirring blade (12), pipeline (13), air circulation purification device (14) and controller (15);The support leg (2) is arranged at the bottom of base (1);The heating tank (3) is arranged at the top of base (1);Heating pipe (4) and temperature sensor (5) are both arranged in the inside of heating tank (3) one end, and the other end extends out of heating tank (3) and controller (15) electric connection;The inside of heating tank (3) is provided with sample table (6);Heating tank (3) and sample table (6) form first cavity;The top of heating tank (3) is provided with fume hood (7);Sample table (6) and fume hood (7) form second cavity;Fume hood (7) is connected by pipeline (13) and air circulation purification device (14);The top of base (1) is provided with main support (8);The transverse connecting support (9) one end is slidably arranged on main support (8), and the other end is connected with electric mixer (10);The one end of connecting rod (11) is connected with electric mixer (10), and the other end is provided with stirring blade (12) and extends to the inside of second cavity;Electric mixer (10) and controller (15) are electrically connected.

2. The laboratory environment-friendly asphalt mixing device according to claim 1, characterized in that, The upper surface of the base (1) is embedded with a disc-shaped air bubble level device (17).

3. The laboratory environment friendly asphalt mixing device as claimed in claim 1, wherein, The support leg (2) is a spiral support leg.

4. The laboratory environment friendly asphalt mixing device as claimed in claim 1, wherein, The transverse connecting support (9) is slidably arranged on the main support (8) through a limiting adjuster (16).

5. The laboratory environment friendly asphalt mixing device as claimed in claim 1, wherein, The main support (8) is provided with a main support rack (81), and the transverse connecting support (9) is provided with a transverse connecting support rack (91).

6. The laboratory environment friendly asphalt mixing device as claimed in claim 1, wherein, The fume hood (7) includes a first fume hood and a second fume hood connected thereto, a through hole is arranged between the first fume hood and the second fume hood, the connecting rod (11) passes through the through hole, and sealing pads (71) are arranged on both sides of the through hole.

7. The laboratory environment friendly asphalt mixing device as claimed in claim 6, wherein, The sealing pads (71) are made of rubber.

8. The laboratory environment friendly asphalt mixing device as claimed in claim 1, wherein, The air circulation purification device (14) includes a first power control key (141), an air purification module (142), and an air circulation pump (143), and the first power control key (141) is electrically connected with the air purification module (142) and the air circulation pump (143) respectively.

9. The laboratory environment friendly asphalt mixing device as claimed in claim 8, wherein, The pipeline (13) includes a first pipeline and a second pipeline, the surface of the fume hood (7) is provided with a first air outlet and a first air inlet, the first air outlet is located above the first air inlet, the surface of the air circulation purification device (14) is provided with a second air outlet and a second air inlet, the second air inlet is located above the second air outlet, the first air outlet and the second air inlet are connected by the first pipeline, and the first air inlet and the second air outlet are connected by the second pipeline.

10. The laboratory environment friendly asphalt mixing device as claimed in claim 1, wherein, The controller (15) is provided with a second power control key (151), a temperature display screen (152), a rotating speed display screen (153), a time display screen (154) and a controller parameter adjustment key (155); the second power control key (151) is electrically connected with the temperature display screen (152), the rotating speed display screen (153), the time display screen (154) and the controller parameter adjustment key (155) respectively.

Images