Laser cleaning device

Abstract

The invention discloses a laser cleaning device, and relates to the technical field of cleaning equipment, the laser cleaning device comprises a cart, a distance detection device, a distance adjusting device, a quick release device and a laser generating device, the distance adjusting device is connected to the cart, and the distance detection device and the laser generating device are connected to the distance adjusting device through the quick release device; the distance detection device is used for detecting the distance between the distance detection device and the to-be-cleaned face and is in signal connection with the distance adjusting device, and the distance adjusting device can adjust the distance between the laser generating device and the to-be-cleaned face and the distance between the distance detection device and the to-be-cleaned face. According to the invention, the operation difficulty is reduced, the workload of operators is reduced, the cleaning effect is improved, the requirement of high-precision cleaning can be met, and the application is flexible.

Description

Technical Field

[0001] The invention relates to the technical field of cleaning equipment, and in particular to a laser cleaning device. Background Art

[0002] Laser cleaning is a technology that uses laser beams to remove pollutants from the surface of materials. It has the advantages of high efficiency, precision and environmental protection, and has been widely used in many fields. Among them, handheld laser cleaning heads are mostly used for manual laser cleaning. Handheld laser cleaning heads are highly flexible and easy to operate, but they have the following disadvantages: First, the operator is required to hold the laser cleaning head and maintain a suitable posture (bending or squatting) throughout the cleaning process, which consumes a lot of physical strength of the operator and is prone to strain, affecting the operator's health; in order to ensure the quality of laser cleaning, the operator needs to concentrate for a long time to ensure that the laser cleaning head is within a reasonable distance from the surface to be cleaned, which is easy to cause mental fatigue. Second, when the operator holds the laser cleaning head for cleaning, it is difficult to stably control the focus position and cleaning position of the laser cleaning head, and it is difficult to meet the needs of high-precision cleaning. For example, when cleaning fine patterns on the ground of ancient monuments, it is easy to cause large color differences and damage to places that do not require laser cleaning. Summary of the invention

[0003] The purpose of the present invention is to provide a laser cleaning device to solve the problems existing in the above-mentioned prior art, reduce the operating difficulty, reduce the workload of operators, and improve the cleaning effect. It can meet the needs of high-precision cleaning and is flexible in application.

[0004] To achieve the above object, the present invention provides the following solutions: The present invention provides a laser cleaning device, comprising a cart, a distance detecting device, a distance adjusting device, a quick-release device and a laser generating device, wherein: the distance adjusting device is connected to the cart, the distance detecting device and the laser generating device are both connected to the distance adjusting device through the quick-release device, the distance detecting device is used to detect the distance between the distance detecting device and a surface to be cleaned, the distance detecting device is connected to the distance adjusting device by signal, and the distance adjusting device can adjust the distance between the laser generating device and the distance detecting device and the surface to be cleaned.

[0005] Preferably, the laser generating device comprises a laser generating body and a handle, the laser generating body and the distance detecting device are both fixedly connected to the handle, and the handle is connected to the distance adjusting device via the quick release device.

[0006] Preferably, the quick-release device includes a fixing part, a pressing part and a locking part, the fixing part is fixedly connected to the distance adjusting device, one end of the pressing part is rotatably connected to one end of the fixing part, and the pressing part can make the quick-release device in an open state or a closed state by rotating relative to the fixing part; when the quick-release device is in the open state, the handle can enter between the pressing part and the fixing part or detach from the pressing part and the fixing part; when the quick-release device is in the closed state, the locking part can lock the pressing part and the fixing part and make the pressing part and the fixing part clamp the handle.

[0007] Preferably, the distance adjustment device includes a driver, a lead screw and a guide device, the quick release device is slidingly connected to the guide device, the quick release device is threadedly connected to the lead screw, the lead screw is rotationally connected to the cart, the driver is connected to the lead screw and can drive the lead screw to rotate around the axis of the lead screw, and the driver is connected to the distance detection device.

[0008] Preferably, the distance adjustment device further comprises a controller, the controller is communicatively connected to the distance detection device, and the controller is signal-connected to the driver.

[0009] Preferably, a smoke collecting device is further included, which includes a smoke collecting pipe. The smoke collecting pipe is fixedly connected to one end of the cart close to the surface to be cleaned, and the laser generating device and the distance detecting device are arranged at the other end of the cart. The air inlet of the smoke collecting pipe is used for allowing smoke generated during laser cleaning to enter the smoke collecting pipe, and the air outlet of the smoke collecting pipe is used for connecting to a purification device.

[0010] Preferably, the smoke collection device also includes a smoke hood, which is fixedly connected to one end of the cart close to the surface to be cleaned, and the smoke hood is in the shape of a cylinder with an opening at one end, and a window is provided on the hood wall opposite to the opening, and the window is arranged opposite to the emitting end of the laser generating device and the detecting end of the distance detecting device; the air inlet of the smoke collection pipe is connected to the inner cavity of the smoke hood.

[0011] Preferably, the cart comprises a wheel assembly, a vehicle body and a push rod, wherein the wheel assembly is connected to the vehicle body, and the push rod is fixedly connected to the vehicle body.

[0012] Preferably, the wheel assembly includes at least three wheels, each of the wheels includes a wheel frame and a roller, at least two of the wheels also include a brake assembly, the wheel frame is connected to the vehicle body, the roller is rotatably connected to the wheel frame, the brake assembly is connected to the wheel frame, and the brake assembly can abut against the roller and maintain its position at the abutment position.

[0013] Preferably, each of the wheels is a universal wheel, there are four wheels, the four wheels are respectively arranged at the four corners of the bottom of the vehicle body, and the brake assembly is arranged on the two wheels close to the push rod.

[0014] Compared with the prior art, the present invention has achieved the following technical effects: The present invention provides a laser cleaning device, including a cart, a distance detection device, a distance adjustment device, a quick release device and a laser generating device, wherein: the distance adjustment device is connected to the cart, the distance detection device and the laser generating device are both connected to the distance adjustment device through the quick release device, the distance detection device is used to detect the distance between the distance detection device and the surface to be cleaned, the distance detection device is connected to the distance adjustment device by signal, and the distance adjustment device can adjust the distance between the laser generating device and the distance detection device and the surface to be cleaned. The laser generating device is supported by the cart, and the real-time distance between the laser generating device and the surface to be cleaned can be obtained through the height data detected in real time by the distance detection device. The distance adjustment device can adjust the distance between the laser generating device and the surface to be cleaned in real time through the real-time detected height data, so as to realize automatic adjustment of the focal length of the laser beam, without the need for the operator to manually adjust and maintain the focal length, and the operator only needs to push the cart to perform laser cleaning work. The present invention reduces the difficulty of operation, reduces the workload of the operator, and improves the cleaning effect, and can meet the needs of high-precision cleaning. The quick-release device can realize the rapid disassembly and assembly of the laser generating device and the distance detecting device. When encountering a narrow area such as a blind spot, the cart is not easy to enter, and the laser generating device can be quickly disassembled and held by hand for laser cleaning operations; at the same time, it is convenient for the repair, maintenance, disassembly and storage of the laser generating device and the distance detecting device, and the application is flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 A front view of the laser cleaning device provided in this embodiment without a vehicle body; Figure 2 for Figure 1 Sectional view of AA in the middle; Figure 3 A schematic diagram of the structure of the laser cleaning device provided in this embodiment; Figure 4 for Figure 3 Enlarged view of middle B; Figure 5 An enlarged view of the quick-release device provided in this embodiment; Figure 6 A bottom view of the laser cleaning device provided in this embodiment; Figure 7 A bottom view of the wheel provided for this embodiment; Figure 8 for Figure 7 Cross-sectional view of the middle BB; Fig. 9 A schematic diagram of the structure of the wheel provided in this embodiment; In the figure: 100, laser cleaning device; 1, cart; 101, car body; 102, push rod; 103, wheel frame; 104, roller; 105, brake assembly; 106, elastic locking plate; 107, rotating locking member; 108, locking plate; 109, second rotating shaft; 110, limit shaft; 111, inner working surface; 112, outer working surface; 2, distance detection device; 3, distance adjustment device; 301, screw; 302, guide device; 4, quick release device; 401, fixing member; 402, pressing member; 403, locking member; 404, window; 405, slide; 5, laser generating device; 501, laser generating body; 502, handle; 6, smoke collecting device; 601, smoke collecting pipe; 602, smoke collecting hood. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] The purpose of the present invention is to provide a laser cleaning device to solve the problems existing in the above-mentioned prior art, reduce the operating difficulty, reduce the workload of operators, and improve the cleaning effect. It can meet the needs of high-precision cleaning and is flexible in application.

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] like Figures 1 to 6As shown, this embodiment provides a laser cleaning device 100, including a cart 1, a distance detection device 2, a distance adjustment device 3, a quick release device 4 and a laser generator 5, wherein: the distance adjustment device 3 is connected to the cart 1, the distance detection device 2 and the laser generator 5 are both connected to the distance adjustment device 3 through the quick release device 4, the distance detection device 2 is used to detect the distance between the distance detection device 2 and the surface to be cleaned, the distance detection device 2 is connected to the distance adjustment device 3 by signal, and the distance adjustment device 3 can adjust the distance between the laser generator 5 and the distance detection device 2 and the surface to be cleaned. The laser generator 5 is supported by the cart 1, and the real-time distance between the laser generator 5 and the surface to be cleaned can be obtained through the height data detected in real time by the distance detection device 2. The distance adjustment device 3 can adjust the distance between the laser generator 5 and the surface to be cleaned in real time through the real-time detected height data, so as to realize the automatic adjustment of the focal length of the laser beam, without the operator manually adjusting and maintaining the focal length. The operator only needs to push the cart 1 to perform laser cleaning. This embodiment reduces the difficulty of operation, reduces the workload of the operator, and improves the cleaning effect, which can meet the needs of high-precision cleaning. The quick-release device 4 can realize the rapid disassembly and assembly of the laser generating device 5 and the distance detecting device 2. When encountering a narrow area such as a blind spot, the cart 1 is not easy to enter, and the laser generating device 5 can be quickly disassembled and held for laser cleaning operations; at the same time, it is convenient for the repair, maintenance, disassembly and storage of the laser generating device 5 and the distance detecting device 2, and the application is flexible.

[0021] In this embodiment, the laser generating device 5 includes a laser generating body 501 and a handle 502. The laser generating body 501 and the distance detecting device 2 are both fixedly connected to the handle 502. The handle 502 is connected to the distance adjusting device 3 through the quick release device 4. By connecting the handle 502 with the quick release device 4, the connection between the laser generating body 501 and the distance detecting device 2 can be realized at the same time. The structure is simple and easy to disassemble and assemble. The distance detecting device 2 and the laser generating device 5 are height-adjusted synchronously to ensure that the height of the laser emitting device can be obtained in real time through the distance detecting device 2.

[0022] In this embodiment, the quick release device 4 includes a fixing member 401, a pressing member 402 and a locking member 403. The fixing member 401 is fixedly connected to the distance adjustment device 3, and one end of the pressing member 402 is rotatably connected to one end of the fixing member 401. The pressing member 402 can make the quick release device 4 in an open state or a closed state by rotating relative to the fixing member 401; when the quick release device 4 is in an open state, the handle 502 can enter between the pressing member 402 and the fixing member 401 or detach from the pressing member 402 and the fixing member 401; when the quick release device 4 is in a closed state, the locking member 403 can lock the pressing member 402 and the fixing member 401 and make the pressing member 402 and the fixing member 401 clamp the handle 502. The locking member 403 is unlocked, and the pressing member 402 is rotated to the side away from the locking end of the fixing member 401, so that the quick release device 4 is in an open state. At this time, the handle 502 can be put in or taken out; after the handle 502 is put between the fixing member 401 and the pressing member 402, the pressing member 402 is rotated in the opposite direction, so that the locking end of the pressing member 402 and the locking end of the fixing member 401 are close to each other, and the locking end of the pressing member 402 and the locking end of the fixing member 401 are locked by the locking member 403, so as to clamp and fix the handle 502, and the structure is simple and easy to disassemble and assemble. The locking member 403 is preferably a butterfly nut.

[0023] In this embodiment, the distance adjustment device 3 includes a driver, a lead screw 301 and a guide device 302, the quick release device 4 is slidably connected to the guide device 302, the quick release device 4 is threadedly connected to the lead screw 301, the lead screw 301 is rotationally connected to the cart 1, the driver is connected to the lead screw 301 and can drive the lead screw 301 to rotate around the axis of the lead screw 301, and the driver is connected to the distance detection device 2. The driver rotates, driving the lead screw 301 to rotate, and under the guiding action of the guide device 302, the quick release device 4 moves up and down along the thread of the lead screw 301, thereby achieving height adjustment.

[0024] As a preferred embodiment, the quick-release device 4 further includes a slide 405 fixedly connected to the fixing member 401 , the slide 405 is slidably connected to the guide device 302 , and the slide 405 is threadedly connected to the lead screw 301 .

[0025] In this embodiment, the distance adjustment device 3 also includes a controller, which is connected to the distance detection device 2 in communication, and the controller is connected to the driver signal. The controller receives the height information detected by the distance detection device 2 in real time, and compares it with the height range value preset in the controller. When it is greater than the preset height range value, the distance between the laser generating device 5 and the surface to be cleaned is reduced, and when it is less than the preset height range value, the distance between the laser generating device 5 and the surface to be cleaned is increased to achieve dynamic adjustment of the focal length.

[0026] The device also includes a smoke collecting device 6, which includes a smoke collecting pipe 601. The smoke collecting pipe 601 is fixedly connected to one end of the cart 1 close to the surface to be cleaned, that is, the bottom of the cart 1. The air inlet of the smoke collecting pipe 601 is used to allow smoke generated during laser cleaning to enter the smoke collecting pipe 601, and the air outlet of the smoke collecting pipe 601 is used to connect to the purification device. The purification device collects the smoke generated during laser cleaning in real time through the smoke collecting pipe 601 to prevent the dust from falling into the cleaning area for the second time and causing pollution, and at the same time prevents the smoke from escaping in the air, meeting environmental protection requirements.

[0027] In this embodiment, the smoke collecting device 6 further includes a smoke collecting hood 602, which is fixedly connected to one end of the cart 1 close to the surface to be cleaned. The smoke collecting hood 602 is in the shape of a cylinder with an opening at one end. A window 404 is provided on the hood wall of the smoke collecting hood 602 which is arranged opposite to the opening. The window 404 is arranged opposite to the transmitting end of the laser generating device 5 and the detecting end of the distance detecting device 2. The air inlet of the smoke collecting pipe 601 is connected to the inner cavity of the smoke collecting hood 602. When the laser beam of the laser generating device 5 passes through the window 404 and the opening to clean the surface to be cleaned, the smoke collecting hood 602 is arranged above the part to be cleaned to collect smoke and improve the smoke and dust removal effect.

[0028] In this embodiment, the cart 1 includes a wheel assembly, a body 101 and a push rod 102, wherein the wheel assembly is connected to the body 101, and the push rod 102 is fixedly connected to the body 101. The push rod 102 is used for an operator to push the cart 1.

[0029] As a preferred embodiment, the push rod 102 is located behind the vehicle body 101 and is 900 mm above the ground.

[0030] In this embodiment, the wheel assembly includes at least three wheels, each wheel includes a wheel frame 103 and a roller 104, at least two wheels also include a brake assembly 105, the wheel frame 103 is connected to the vehicle body 101, the roller 104 is rotatably connected to the wheel frame 103, and the brake assembly 105 is connected to the wheel frame 103, and the brake assembly 105 can abut against the roller 104 and maintain its position at the abutting position. When the area to be cleaned is reached, the wheel can be locked by the brake assembly 105 to prevent the laser beam from shifting during laser cleaning and to prevent damage to the non-cleaned area, so that the area to be cleaned can be stably cleaned to a certain extent, which is conducive to achieving high-quality cleaning.

[0031] like Figures 7-9As shown, in this embodiment, the wheel frame 103 and the vehicle body 101 are formed to rotate around a first rotating shaft perpendicular to the ground, and the wheel frame 103 can rotate 360 ​​degrees around the axis of the first rotating shaft. The brake assembly 105 includes an elastic locking plate 106, a rotation locking member 107 and a locking plate 108. The locking plate 108 is arranged on the side of the bottom plate of the wheel frame 103 close to the roller 104 and is fixedly connected to the first rotating shaft; one end of the elastic locking plate 106 is arranged between the locking plate 108 and the roller 104, and the other end of the elastic locking plate 106 extends from between the roller 104 and the wheel frame 103; the rotation locking member 107 is arranged above the other end of the elastic locking plate 106, and the rotation locking member 107 is arranged above the other end of the elastic locking plate 106. The locking member 107 is rotatably connected to the wheel frame 103 through the second rotating shaft 109; a limiting axis 110 is provided on the side of the elastic locking piece 106 away from the bottom plate of the wheel frame 103, and the limiting axis 110 can limit the movement of the elastic locking piece 106 away from the bottom plate of the wheel frame 103; the rotating locking member 107 is provided with a curved working surface, and the working surface is divided into an inner working surface 111 and an outer working surface 112 by its own vertex. When unlocked, the inner working surface 111 is arranged close to the first rotating shaft. In the initial state, the inner working surface 111 can contact the elastic locking piece 106; when locking is required, the rotating locking piece 107 is operated to rotate around the second rotating shaft 109 to the side close to the elastic locking piece 106, and the contact point between the elastic locking piece 106 and the working surface gradually moves toward the outer working surface 112, and pushes the extended end of the elastic locking piece 106 to rotate toward the side close to the roller 104. When the vertex of the working surface contacts the elastic locking piece 106, the rotating locking piece 107 The pushing force on the elastic locking piece 106 is the greatest. When the rotating locking piece 107 rotates to the outer working surface 112 and contacts with the elastic locking piece 106, the elastic locking piece 106 can limit the reverse rotation of the rotating locking piece 107, thereby achieving locking and retention; when unlocking is required, the rotating locking piece 107 is rotated in the reverse direction until the inner working surface 111 contacts with the elastic locking piece 106, and the elastic locking piece 106 can automatically restore its original shape, thereby breaking contact with the roller 104 and the locking plate 108.

[0032] As a preferred embodiment, the laser generating device 5 is connected to the controller signal, and the cleaning parameters can be preset through the controller. When the wheel is locked, the controller controls the laser generating device 5 to start cleaning with the set parameters. When the cleaning time is reached, the laser generating device 5 is automatically turned off, further improving the cleaning quality and the level of cleaning automation.

[0033] The cleaning parameters include cleaning time, cleaning laser power, cleaning laser frequency, cleaning laser line width, etc., among which laser power refers to the power output by the laser, usually in watts (W). Laser power directly affects the cleaning effect. If the power is too low, the cleaning effect is poor; if the power is too high, it may cause overheating or damage to the material. For stainless steel materials, the laser power range is preferably between 10-20W; for aluminum materials, the laser power range is preferably between 15-30W; for larger or more stubborn pollutants, higher power lasers may be required, such as 3000W. Laser frequency refers to the repetition frequency of laser pulses, usually in kilohertz (kHz). The higher the laser frequency, the more laser pulses per unit time, and the higher the cleaning efficiency may be, but too high a frequency may cause material damage. The preferred frequency for pulsed laser cleaning of aluminum alloy surface paint is 60kHz; the preferred frequency for pulsed laser cleaning of carbon steel surface paint is 40kHz. The frequency used for continuous laser cleaning is usually lower, such as 30kHz. Laser linewidth refers to the width of the light signal emitted by the laser within the wavelength range, usually in nanometers (nm) or Hertz (Hz). The narrower the laser linewidth, the more concentrated the laser energy and the better the cleaning effect, but the higher the stability and technical requirements of the laser. In laser cleaning applications, the selection of laser linewidth needs to be adjusted according to the specific materials and cleaning requirements. Generally, narrow linewidth lasers are suitable for occasions that require high-precision cleaning. For example, some high-end laser cleaning equipment can use a laser linewidth of 5mm to achieve efficient and precise cleaning effects.

[0034] In this embodiment, each wheel is a universal wheel. There are four wheels, which are respectively arranged at the four corners of the bottom of the vehicle body 101 . Brake assemblies 105 are arranged on the two wheels close to the push rod 102 .

[0035] As a preferred embodiment, the distance adjustment device 3 and the quick release device 4 are both arranged in the vehicle body 101 .

[0036] As a preferred embodiment, this embodiment can perform laser cleaning on the ground, for example, cleaning fine patterns on the ground of ancient monuments, but it is not limited thereto, and other surfaces that can meet the requirements of the cart 1 being pushed can also be cleaned.

[0037] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A laser cleaning device, characterized in that: The invention comprises a trolley, a distance detecting device, a distance adjusting device, a quick release device and a laser generating device, wherein: the distance adjusting device is connected to the trolley, the distance detecting device and the laser generating device are both connected to the distance adjusting device through the quick release device, the distance detecting device is used to detect the distance between the distance detecting device and the surface to be cleaned, the distance detecting device is connected to the distance adjusting device by signal, and the distance adjusting device can adjust the distance between the laser generating device and the distance detecting device and the surface to be cleaned.

2. The laser cleaning device according to claim 1, characterized in that: The laser generating device comprises a laser generating body and a handle. The laser generating body and the distance detecting device are both fixedly connected to the handle. The handle is connected to the distance adjusting device via the quick release device.

3. The laser cleaning device according to claim 2, characterized in that: The quick-release device comprises a fixing part, a pressing part and a locking part, wherein the fixing part is fixedly connected to the distance adjusting device, one end of the pressing part is rotatably connected to one end of the fixing part, and the pressing part can make the quick-release device in an open state or a closed state by rotating relative to the fixing part; when the quick-release device is in the open state, the handle can enter between the pressing part and the fixing part or be separated from the pressing part and the fixing part; when the quick-release device is in the closed state, the locking part can lock the pressing part and the fixing part and make the pressing part and the fixing part clamp the handle.

4. The laser cleaning device according to claim 1, characterized in that: The distance adjustment device includes a driver, a lead screw and a guide device, the quick release device is slidably connected to the guide device, the quick release device is threadedly connected to the lead screw, the lead screw is rotationally connected to the cart, the driver is connected to the lead screw and can drive the lead screw to rotate around the axis of the lead screw, and the driver is connected to the distance detection device.

5. The laser cleaning device according to claim 4, characterized in that: The distance adjustment device further comprises a controller, wherein the controller is communicatively connected to the distance detection device, and the controller is signal-connected to the driver.

6. The laser cleaning device according to claim 1, characterized in that: It also includes a smoke collecting device, which includes a smoke collecting pipe. The smoke collecting pipe is fixedly connected to one end of the cart close to the surface to be cleaned, and the laser generating device and the distance detecting device are arranged at the other end of the cart. The air inlet of the smoke collecting pipe is used for allowing smoke generated during laser cleaning to enter the smoke collecting pipe, and the air outlet of the smoke collecting pipe is used for connecting to a purification device.

7. The laser cleaning device according to claim 6, characterized in that: The smoke collection device also includes a smoke collection hood, which is fixedly connected to one end of the cart close to the surface to be cleaned. The smoke collection hood is in the shape of a cylinder with an opening at one end. A window is provided on the hood wall opposite to the opening. The window is opposite to the emitting end of the laser generating device and the detecting end of the distance detecting device. The air inlet of the smoke collection pipe is connected to the inner cavity of the smoke collection hood.

8. The laser cleaning device according to claim 1, characterized in that: The cart comprises a wheel assembly, a vehicle body and a push rod, wherein the wheel assembly is connected to the vehicle body, and the push rod is fixedly connected to the vehicle body.

9. The laser cleaning device according to claim 8, characterized in that: The wheel assembly includes at least three wheels, each of which includes a wheel frame and a roller, and at least two of the wheels also include a brake assembly. The wheel frame is connected to the vehicle body, the roller is rotatably connected to the wheel frame, and the brake assembly is connected to the wheel frame. The brake assembly can abut against the roller and maintain its position at the abutting position.

10. The laser cleaning device according to claim 9, characterized in that: Each of the wheels is a universal wheel. There are four wheels, which are respectively arranged at four corners of the bottom of the vehicle body. The brake assembly is arranged on two of the wheels close to the push rod.

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