Mirror traction type light and heat heliostat automatic dust removal device and dust removal method

Abstract

The application provides a mirror traction type photo-thermal heliostat automatic dust removal device and a dust removal method. The dust removal device comprises a brush roller and an electric drive device. The brush roller is in contact with the mirror of the heliostat and the lengths of the brush roller and the mirror are matched. Wire rollers are fixedly connected to both ends of the brush roller. The electric drive device is coaxially installed at both ends of the wire rollers. A traction cable is wound on the wire rollers. The other end of the traction cable is fixedly arranged at the top end of the heliostat. The outer diameter D of the wire roller is smaller than the outer diameter D0 of the brush roller. The brush roller and the wire roller are synchronously rotated upward or downward by the traction cable and the electric drive device. The brush roller moves up and down along the mirror of the heliostat. The eccentric friction force between the brush and the mirror generated by gravity traction is fully utilized, and the floating dust on the mirror can be effectively removed.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of solar thermal power generation, and particularly relates to a mirror traction type light and heat heliostat automatic dust removal device and a dust removal method. BACKGROUND

[0002] The heliostat is a light focusing device composed of a light surface emitting mirror, a supporting structure system, a tracking transmission mechanism and an integrated control system. Under the control system, a plurality of surface heliostats track, receive and gather reflected sunlight heat, and are an important component of a light and heat collecting system in a tower type light and heat power station. Generally, a tower type solar thermal power station is constructed in a Gobi plain or a desert edge zone with very good light resources. Dust and sundries and other small particles are inevitably accumulated on the surface of the heliostat mirror, thereby affecting the reflectivity of the heliostat and reducing the power generation efficiency of light and heat collecting.

[0003] At present, cleaning of the heliostat mirror surface has been a key problem in the field of solar thermal power generation, mainly embodied in that not only the mirror surface needs to be cleaned and dusted efficiently, but also the cleaning device needs to have convenience and energy saving. The cleaning method of the heliostat mirror field that has been constructed and put into use at present mainly adopts mechanical cleaning, which mainly has the following characteristics: a mechanical cleaning vehicle is adopted, and the cleaning process of the mirror surface is generally water spraying followed by contact type brushing. The main shortcomings are that manual operation is needed, the technical requirement is high, the water consumption is large, it is not suitable for the environment of water resource shortage and cold northwest region, especially for a heliostat mirror field with more than ten thousand mirrors, the cleaning speed is low, the cost is high, it is difficult to guarantee that all the mirrors are cleaned in a short time, and the mirror surface is likely to be damaged in the cleaning process due to the high and low relief of the site road surface, and the mechanical equipment needs to be regularly maintained. SUMMARY

[0004] The present application aims to provide a mirror traction type light and heat heliostat automatic dust removal device to overcome the above technical problems in the prior art.

[0005] Another object of the present application is to provide a heliostat dust removal method, which fully utilizes the eccentric friction force between the brush and the mirror surface generated by gravity traction to effectively remove the dust accumulated on the mirror surface.

[0006] To this end, the technical solution provided by the present application is as follows:

[0007] A mirror traction type light and heat heliostat automatic dust removal device, comprising a brush roller and an electric drive device, the brush roller is in contact with the heliostat mirror surface and the lengths of the two are matched, both ends of the brush roller are fixedly connected with winding rollers, the electric drive device is coaxially installed at both ends of the winding roller, a traction cable is wound on the winding roller, the other end of the traction cable is fixedly arranged at the top end of the heliostat, and the outer diameter D of the winding roller is smaller than the outer diameter D0 of the brush roller.

[0008] The electric drive device comprises an electric motor, a sliding support and a speed reducer, the electric motor is installed on the sliding support, the output shaft of the electric motor is connected with the speed reducer, and the output shaft of the speed reducer is connected with the brush roller.

[0009] The sun-tracking mirror is symmetrically provided with sunshade protective covers at the top end, the sunshade protective covers are provided with hanging fulcrums, the other end of the traction cable is fixedly connected with the hanging fulcrums, the straight line where the two hanging fulcrums are located is parallel to the winding roller, and the direction of the traction cable is perpendicular to the winding roller.

[0010] The lower end surface of the sun-tracking mirror is connected with a supporting column through a rotating shaft.

[0011] The outer diameter D of the winding roller and the outer diameter D0 of the brush roller are different by 15-45 mm.

[0012] The sliding support comprises a support and a supporting wheel set, the speed reducer is arranged on the support, and the support cover is arranged above the winding roller.

[0013] The middle part of the support is in a circular arc shape, the two ends are symmetrically connected with the supporting wheel set through horizontal plates, the supporting wheel set is composed of upper supporting wheels and lower supporting wheels, and the upper supporting wheels and the lower supporting wheels are arranged on the upper end surface and the lower end surface of the sun-tracking mirror respectively and are connected through a connecting plate.

[0014] A sun-tracking mirror dust removal method adopts a mirror traction type light and heat sun-tracking mirror automatic dust removal device, an electric drive device drives the brush roller and the winding roller to rotate upwards or downwards synchronously, relative sliding is generated between the brush on the brush roller and the mirror surface of the sun-tracking mirror, so that the brush roller rolls and brushes the mirror surface of the sun-tracking mirror, and the dust on the mirror surface of the sun-tracking mirror is removed.

[0015] When the electric drive device drives the brush roller to rotate downwards, the traction cable is unwound and becomes longer, because the outer diameter of the brush roller is larger than that of the winding roller, the rotational linear speed of the contact part between the bristles of the brush roller and the mirror surface of the sun-tracking mirror during the falling process is greater than the falling speed of the brush roller R , a speed difference is generated, the speed difference in the falling movement process causes the brush to slide relative to the mirror surface of the sun-tracking mirror, so that the brush roller rolls and brushes the mirror surface of the sun-tracking mirror, and the dust on the mirror surface of the sun-tracking mirror is removed. V

[0016] When the electric drive device drives the brush roller to rotate upwards, the traction cable is wound on the winding roller, the free length of the traction cable is reduced, the position of the brush roller rises in the rotating process, and the rotating speed of the electric motor is used to control the rising speed of the brush roller.

[0017] The beneficial effects of the present application are as follows:

[0018] ​The mirror traction type light and heat heliostat automatic dust removal device provided by the application realizes synchronous upward or downward rotation of the brush roller and the winding roller through the traction rope and the electric drive device, removes dust on the mirror surface of the heliostat through the brush roller moving up and down along the mirror surface of the heliostat, and performs brush rolling on the mirror surface of the heliostat.

[0019] The mirror traction type light and heat heliostat automatic dust removal device provided by the application utilizes the eccentric friction force between the brush and the mirror surface generated by gravity traction according to the operation law of the heliostat, and can effectively remove floating dust on the mirror surface.

[0020] The center roller and the brush of the brush roller can be conveniently customized and assembled, the diameter of the center roller, the type and length of the brush can be adjusted according to different sizes of the heliostat, and therefore the application range is wide, the device can be applied in various different sites, is suitable for dry, dusty and water resource scarce areas such as deserts and plateaus, and is also suitable for cold weather environment with low temperature.

[0021] The application will be further described in detail below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a three-dimensional overall schematic view of the brush roller installed on the mirror surface of the heliostat.

[0023] Figure 2 It is a three-dimensional detail view of the brush roller installed on the mirror surface of the heliostat.

[0024] Figure 3 It is a side view schematic diagram of the brush roller and the electric device hoisting force.

[0025] Figure 4 It is an overall side view schematic diagram of the brush roller working on the mirror surface of the heliostat.

[0026] Figure 5 It is a detail schematic diagram of the electric drive device.

[0027] In the drawings: 1, brush roller; 101, center roller; 102, brush hair; 103, winding roller; 2, heliostat; 3, traction rope; 4, hanging point; 5, electric drive device; 501, sliding support; 502, electric motor; 503, speed reducer; 504, support wheel set; 6, support column; 7, sunshade protective cover. DETAILED DESCRIPTION

[0028] The following describes the embodiments of the application by specific examples, and other advantages and effects of the application can be easily understood by those skilled in the art according to the content disclosed in the specification.

[0029] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to fully and completely disclose the invention and to fully convey its scope to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the drawings is not intended to limit the invention. In the drawings, the same units / elements are referred to by the same reference numerals.

[0030] Unless otherwise stated, the terms used herein (including technical terms) have their common meaning as understood by one of ordinary skill in the art. Furthermore, it is understood that terms defined in commonly used dictionaries should be understood to have a meaning consistent with the context of their relevant field, and not to be interpreted as having an idealized or overly formal meaning.

[0031] Example 1:

[0032] This embodiment provides an automatic dust removal device for a mirror-traction type photothermal heliostat, including a brush roller 1 and an electric drive device 5. The brush roller 1 is in contact with the mirror surface of the heliostat 2 and the lengths of the two are matched. Both ends of the brush roller 1 are fixedly connected to a winding roller 103. The electric drive device 5 is coaxially mounted on both ends of the winding roller 103. A traction cable 3 is wound on the winding roller 103. The other end of the traction cable 3 is fixed to the top of the heliostat 2. The outer diameter D of the winding roller 103 is smaller than the outer diameter D0 of the brush roller 1.

[0033] like Figure 1 As shown, the brush roller 1 is suspended on the surface of the heliostat 2 via traction cables 3 on both sides. The length of the brush roller 1 matches the length of the heliostat 2 to cover the entire surface of the heliostat 2 for dust removal as much as possible. The heliostat 2 consists of 3x3 or 4x4 prefabricated mirror units, with a total area generally ranging from 20 to 60 square meters. In practice, different winding rollers 103 and brush roller 1 diameters are selected according to the actual size of the heliostat 2 to control the weight of the dust removal device and the pressure applied to the mirror surface by the brush roller 1, thereby achieving the purpose of removing accumulated dust under different conditions.

[0034] like Figure 2 As shown, the brush roller 1 includes a center roller 101 and brush bristles 102. The brush bristles 102 are attached to the center roller 101, and the center roller 101 and brush bristles 102 are a single finished product. The brush bristles 102 are made of different grades of heat-resistant and wear-resistant polyurethane series according to the usage environment of the heliostat 2. The winding roller 103 is located on the left and right sides of the center roller 101. After being perforated, it is wound with the traction cable 3. The outer diameter D of the winding roller 103 is smaller than the outer diameter D0 of the brush roller 1.

[0035] Principle of this invention:

[0036] like Figure 3As shown, when the heliostat 2 mirror surface is at an angle θ with the ground, the brush roller 1 is under the action of gravity G, on one hand, it forms a pressure angle θ to the heliostat 2 mirror surface, and applies a pressure P=G×cos(θ) to the mirror surface, on the other hand, it forms a tension F=G×sin(θ) to the traction cable 3. The bristles 102 are deformed under the action of the pressure P and tightly adhere to the heliostat 2 mirror surface. At the same time, since the tension F applied by the traction cable 3 to the winding roller 103 is not coincident with the gravity center O of the brush roller 1, the distance between them is S. The eccentric force F will make the brush roller 1 generate an eccentric torque N=F×S. When the brush roller 1 falls from the upper end of the heliostat 2 mirror surface under the action of gravity, the eccentric torque N formed by the tension will make the brush roller 1 rotate, so that the traction cable 3 is unwound and lengthened, the brush roller 1 moves downward along the heliostat 2 mirror surface to form a rolling brush effect, and the dust on the heliostat 2 mirror surface is removed, at the same time, the electric drive device 5 is driven to move downward along the heliostat 2 mirror surface, and the rotating speed of the electric drive device 5 is used to control the falling speed of the brush roller 1.

[0037] Embodiment 2:

[0038] On the basis of embodiment 1, the embodiment provides a mirror surface traction type light-heat heliostat automatic dust removal device, the electric drive device 5 comprises an electric motor 502, a sliding bracket 501 and a speed reducer 503, the electric motor 502 is installed on the sliding bracket 501, the output shaft of the electric motor 502 is connected to the speed reducer 503, and the output shaft of the speed reducer 503 is connected to the brush roller 1.

[0039] As shown in Figure 5 , the electric motor 502 is installed on the sliding bracket 501, the output of the electric motor 502 is connected to the speed reducer 503, and the output shaft of the speed reducer 503 is connected to the center roller 101 of the brush roller 1, so that the brush roller 1 and the winding roller 103 can be driven to rotate synchronously. During the working process of the electric drive device 5, the sliding bracket 501 can slide linearly upward or downward along the heliostat 2 mirror surface, but cannot rotate.

[0040] Embodiment 3:

[0041] On the basis of embodiment 1, the embodiment provides a mirror surface traction type light-heat heliostat automatic dust removal device, the top end of the heliostat 2 is symmetrically provided with a sunshade protective cover 7, the sunshade protective cover 7 is provided with a hanging fulcrum, the other end of the traction cable 3 is fixedly connected to the hanging fulcrum, a straight line where the two hanging fulcrums are located is parallel to the winding roller 103, and the direction of the traction cable 3 is perpendicular to the winding roller 103.

[0042] As shown in Figure 2 and Figure 4As shown, one end of the traction cable 3 is wound around the winding roller 103, and the other end is fixed to the hanging point 4 of the sunshade protective cover 7 above the mirror surface of the heliostat 2. The traction cable 3 is a flexible traction line, and the diameter is generally 1.5-2.0 mm. During the lifting process, the direction of the traction cable 3 is always perpendicular to the winding roller 103, and the gravity center of the brush roller 1 does not coincide with the brush roller 1, and the distance S is close to D / 2; the other end of the traction cable 3 is fixedly connected with the hanging support point, and the hanging support point is parallel to the winding roller 103 and is fixed to the top of the heliostat 2.

[0043] The sunshade protective cover 7 is mainly used for winding the brush roller 1 into the sunshade protective cover 7 by the electric drive device 5 when the night comes or the device does not work, so as to improve the service life and durability of the brush roller 1 and the electric drive device 5.

[0044] Embodiment 4:

[0045] On the basis of embodiment 1, the embodiment provides a mirror surface traction type light and heat heliostat automatic dust removal device, and the lower end surface of the heliostat 2 is connected with a support column 6 through a rotating shaft.

[0046] As shown in the figure, Figure 4 The heliostat 2 is supported by the support column 6, and the angle θ between the heliostat 2 and the ground can be adjusted through the pitch angle adjusting system (the rotating shaft in this embodiment) of the heliostat 2. For the dust removal process, the first function of the support column 6 is to adjust the pressure P applied to the mirror surface by the brush roller 1 through the θ angle, and then to adjust the contact surface of the brush 102 on the mirror surface, so as to achieve the purpose of removing dust according to different situations; the second function is to reduce the angle θ when the electric drive device 5 drives the brush roller 1 to rotate upward, so that the mirror surface of the heliostat 2 is close to horizontal, thereby reducing the torque demand of the motor 502 and the speed reducer 503 in the upward process.

[0047] Embodiment 5:

[0048] On the basis of embodiment 1, the embodiment provides a mirror surface traction type light and heat heliostat automatic dust removal device, and the outer diameter D of the winding roller 103 is different from the outer diameter D0 of the brush roller 1 by 15-45 mm.

[0049] As shown in the figure, Figure 4 Since the diameter of the brush roller 1 is greater than that of the winding roller 103, the rotational linear velocity R of the contact part of the brush 102 and the heliostat 2 in the falling process is greater than the falling velocity V of the brush roller 1, and a velocity difference is generated. The velocity difference in the falling motion process causes the relative sliding between the brush on the brush roller 1 and the heliostat 2, so that the brush roller 1 forms a rolling brush effect on the heliostat 2, and the accumulated dust on the heliostat 2 can be removed.

[0050] The embodiment can also be provided with a control system to control the start and stop of the electric drive device 5 and the forward and reverse rotation through real-time monitoring of the displacement data of the displacement sensor or rotary encoder, to realize accurate control of the lifting and lowering distance of the traction cable 3.

[0051] Embodiment 6

[0052] On the basis of Embodiment 1, the embodiment provides a mirror traction type photothermal heliostat automatic dust removal device, the sliding support 501 comprises a support and a support wheel set 504, the speed reducer 503 is arranged on the support, and the support cover is arranged above the winding roller 103.

[0053] The middle part of the support is in a circular arc shape, and the two ends are symmetrically connected to the support wheel set 504 through horizontal plates, the support wheel set 504 is composed of upper support wheels and lower support wheels, and the upper support wheels and the lower support wheels are respectively arranged on the upper and lower end surfaces of the heliostat 2 and are connected through a connecting plate. Figure 5

[0054] In the embodiment, the speed reducer is a turbine worm speed reducer, the worm is connected with the output shaft of the motor 502, and the turbine output shaft is connected with the winding roller 103. The support cover is arranged above the winding roller 103 and does not affect the rotation of the winding roller 103. The support wheel set 504 restricts the sliding support 501 to be able to slide but not to be able to rotate, the sliding support 501 can restrict the distance between the brush roller 1 and the heliostat surface 2 during the movement of the brush roller 1 along the heliostat surface, and thus the bending degree of the brush 102 is controlled, and the sliding support 501 can provide a reverse support torque for the rotation of the brush roller 1.

[0055] Embodiment 7

[0056] The embodiment provides a heliostat dust removal method, which adopts a mirror traction type photothermal heliostat automatic dust removal device, the electric drive device 5 drives the brush roller 1 and the winding roller 103 to synchronously rotate upward or downward, the brush on the brush roller 1 generates relative sliding with the mirror surface of the heliostat 2, so that the brush roller 1 performs rolling brushing on the mirror surface of the heliostat 2, and the accumulated dust on the mirror surface of the heliostat 2 is removed.

[0057] As shown in Figure 3 ​As shown, when the heliostat 2's mirror surface forms a certain angle θ with the ground, the brush roller 1, under the action of gravity G, exerts a pressure angle θ on the heliostat 2's mirror surface, with a pressure P = G × cos(θ). Simultaneously, it exerts a tension F = G × sin(θ) on the traction cable 3. The bristles 102 deform under the pressure P and adhere tightly to the heliostat 2's mirror surface. At the same time, the tension F exerted by the traction cable 3 on the winding roller 103 does not coincide with the center of gravity O of the brush roller 1, and the distance between them is S. The eccentric force F will cause the brush roller 1 to generate an eccentric torque N=F×S. When the brush roller 1 falls from the upper end of the heliostat 2 under the action of gravity, the eccentric torque N formed by its tension will cause the brush roller 1 to rotate, causing the traction cable 3 to unwind and lengthen. The brush roller 1 moves downward along the heliostat 2 to form a rolling brush effect, removing the dust accumulated on the heliostat 2. At the same time, it drives the electric drive device 5 to move downward along the heliostat 2. The rotation speed of the electric drive device 5 is used to control the descent speed of the brush roller 1.

[0058] Example 8:

[0059] Based on Example 7, this example provides a method for dust removal from a heliostat. When the electric drive device 5 drives the brush roller 1 to rotate downwards, the traction cable 3 unwinds and becomes longer. Since the outer diameter of the brush roller 1 is larger than that of the winding roller 103, the rotational linear velocity of the part of the brush bristles 102 of the brush roller 1 that contacts the mirror surface of the heliostat 2 during the descent is... R The falling speed is greater than that of brush roller 1 V The speed difference generated during the falling motion causes the brush to slide relative to the surface of the heliostat 2, thereby allowing the brush roller 1 to roll and brush the surface of the heliostat 2 to remove the accumulated dust.

[0060] When the electric drive device 5 drives the brush roller 1 to rotate upward, the traction cable 3 winds around the winding roller 103, the free length of the traction cable 3 decreases, and the position of the brush roller 1 rises during the rotation. The rotation speed of the motor 502 is used to control the rising speed of the brush roller 1.

[0061] like Figure 4 As shown, the heliostat 2 is supported by the support column 6, which holds the heliostat 2 at a certain angle to the ground. The falling speed of the brush roller 1 on the surface of the heliostat 2 is... V This is equal to the linear velocity of the unwinding motion of the winding roller 103. Since the diameter of the brush roller 1 is larger than that of the winding roller 103, the linear velocity of the brush bristles 102 in contact with the heliostat 2 during the descent is... R The falling speed is greater than that of brush roller 1 V This creates a speed difference.

[0062] When the electric drive device 5 drives the brush roller 1 to rotate upward, the traction cable 3 is wound on the winding roller 103, the free length of the traction cable 3 is reduced, and the brush roller 1 is lifted in position during rotation. When the electric drive device 5 drives the brush roller 1 to rotate downward in reverse, the traction cable 3 is unwound from the winding roller 103, the free length of the traction cable 3 is increased, the brush roller 1 is lowered in position during rotation, and the rotation speed of the electric motor 502 is used to control the lowering speed of the brush roller 1.

[0063] In summary, the mirror traction type light and heat heliostat automatic dust removal device provided by the present application can effectively remove the floating dust on the mirror according to the operation law of the heliostat 2, fully utilizes the eccentric friction force between the brush and the mirror generated by gravity traction, and has the advantages of simple structure, low cost of each component, no need for manual maintenance, significant energy saving and cost advantage.

[0064] The device has wide applicability, the center roller 101 and the brush can be conveniently customized and assembled, the diameter of the center roller 101, the type and length of the brush can be adjusted accordingly for heliostats 2 of different sizes, and the device can be applied in various different sites, is suitable for dry, dusty and water resource scarce areas such as deserts and plateaus, and is also suitable for cold weather environment with low temperature.

[0065] The above examples are only illustrative of the present application and do not constitute a limitation on the protection scope of the present application, and any design identical or similar to the present application falls within the protection scope of the present application.

Claims

1. A mirror traction type of a heliostat automatic dust removal device, characterized in that: The brush roller is in contact with the mirror surface of the heliostat and the lengths of the brush roller and the heliostat are matched, wire winding rollers are fixed to both ends of the brush roller, the electric drive device is coaxially installed at the wire winding rollers, a traction cable is wound on the wire winding rollers, the other end of the traction cable is fixed to the top end of the heliostat, the outer diameter D of the wire winding roller is smaller than the outer diameter D0 of the brush roller; The top end of the heliostat is symmetrically provided with sunshade protective covers, the sunshade protective covers are provided with hanging fulcrums, the other end of the traction cable is fixed to the hanging fulcrums, the straight line where the two hanging fulcrums are located is parallel to the wire winding roller, the direction of the traction cable is perpendicular to the wire winding roller and does not coincide with the gravity center of the brush roller. The electric drive device comprises a motor, a sliding support and a speed reducer, the motor is installed on the sliding support, the output shaft of the motor is connected to the speed reducer, the output shaft of the speed reducer is connected to the brush roller.

2. The mirror traction type of a solar power tower power plant automatic dust removal device according to claim 1, characterized in that: The lower end surface of the heliostat is connected to a support column through a rotating shaft.

3. The mirror traction type of a solar power tower power plant automatic dust removal device according to claim 1, characterized in that: The outer diameter D of the wire winding roller is 15-45 mm different from the outer diameter D0 of the brush roller.

4. The mirror traction type of a solar power tower power plant automatic dust removal device according to claim 1, characterized in that: The sliding support comprises a support and a support wheel set, the speed reducer is arranged on the support, and the support cover is arranged above the wire winding roller; The middle part of the support is in a circular arc shape, the two ends are symmetrically connected to the support wheel set through horizontal plates, the support wheel set is composed of upper support wheels and lower support wheels, and the upper support wheels and the lower support wheels are arranged on the upper and lower end surfaces of the heliostat respectively and are connected through a connecting plate.

5. A method for dust removal of heliostat, characterized in that the method uses the mirror-pulling type automatic dust removal device for light and heat heliostat according to any one of claims 1-4. The electric drive device drives the brush roller and the wire winding roller to synchronously rotate upward or downward, the relative sliding between the brush on the brush roller and the mirror surface of the heliostat is generated, so that the brush roller rolls and brushes the mirror surface of the heliostat to remove the dust on the mirror surface of the heliostat.

6. A method of dust removal from a heliostat according to claim 5, characterized in that: When the electric drive device drives the brush roller to rotate downward, the traction cable is unwound and becomes longer, because the outer diameter of the brush roller is larger than that of the wire winding roller, the rotational linear speed R of the part of the brush on the brush roller in contact with the mirror surface of the heliostat is greater than the falling speed V of the brush roller, a speed difference is generated, and the speed difference in the falling movement process causes the relative sliding between the brush and the mirror surface of the heliostat, so that the brush roller rolls and brushes the mirror surface of the heliostat to remove the dust on the mirror surface of the heliostat.

7. A method of dust removal from heliostats according to claim 5, characterized in that: When the electric drive device drives the brush roller to rotate upward, the traction cable is wound on the wire winding roller, the free length of the traction cable is reduced, the position of the brush roller is raised in the rotating process, and the rotating speed of the motor is used to control the raising speed of the brush roller.

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