Ground spreading device capable of controlling coating thickness

Abstract

The ground spreading device capable of controlling the coating thickness comprises a walking trolley, and a spraying mechanism, a scraper mechanism, a distance measuring mechanism and a control system are arranged on the walking trolley; the spraying mechanism comprises a coating box, a pump, a collecting pipe and a nozzle which are sequentially connected through a pipeline; the nozzle is positioned on the walking trolley and can cover the width of the walking trolley; the scraping plate mechanism comprises a scraping plate positioned near the front of the spray head and a scraping plate lifting assembly for driving the scraping plate to lift in a millimeter level; the distance measuring mechanism has a reference point A, the lower end of the scraper is a point B when the scraper is located at the upper limit, the height difference between the point B and the reference point A is fixed, the distance measuring mechanism is used for measuring the distance L from the reference point A to the ground, and the precision is above the millimeter level; the control system can obtain the distance D from the point B to the ground according to the measured distance L and the height difference, and controls the scraper lifting assembly to drive the scraper at the upper limit position to descend by the distance of D-h when the coating thickness h is set. The device can perform millimeter-level control on the coating thickness.

Description

Technical Field

[0001] The present invention relates to coating paving, and particularly to a ground paving device capable of controlling the thickness of the coating. Background Art

[0002] It is usually necessary to pave waterproof coatings on the ground such as the basement floor slab and the roof. Generally, manual paving is carried out using a squeegee. During construction, in order to be fast, workers either miss smearing and generate protection leakage points, or pave too thickly and cause waste. Even if workers pave carefully, they cannot ensure uniform thickness, let alone accurately control the coating thickness. At present, although there are some automatic spraying devices, they all try to ensure uniformity in spraying and cannot ensure uniform thickness on the ground. Especially for waterproof coatings with a thickness range of several millimeters, millimeter-level thickness control cannot be ensured. Summary of the Invention

[0003] The purpose of the present invention is to provide a ground paving device capable of controlling the thickness of the coating, which can perform millimeter-level control on the coating thickness.

[0004] The technical solution adopted by the present invention is as follows: A ground paving device capable of controlling the thickness of the coating includes a walking trolley, on which a coating spraying mechanism, a squeegee mechanism, a distance measuring mechanism and a control system are provided; the coating spraying mechanism is used for spraying the coating onto the ground, and it includes a coating tank, a pump and an aggregate pipe connected in sequence through a pipeline, and a row of nozzles provided on the aggregate pipe. The nozzles are located in front of the walking trolley and face downward, and the working range of the nozzles can cover the width of the walking trolley; the squeegee mechanism is used for scraping and leveling the coating with a squeegee, and it includes a squeegee near the front of the nozzles and a squeegee lifting assembly for driving the squeegee to lift and lower. The squeegee has an upper limit position, and the squeegee lifting assembly can drive the squeegee to move in millimeters; the distance measuring mechanism has a reference point A. When the squeegee is at the upper limit position, the lower end of the squeegee is point B, and the height difference between point B and the reference point A is fixed and is H. The distance measuring mechanism is used for measuring the distance L from the reference point A to the ground, with an accuracy above the millimeter level; the control system can obtain the distance D from point B to the ground according to the measured distance L and the known height difference H, and when setting the coating thickness h, control the squeegee lifting assembly to drive the squeegee at the upper limit position to descend by a distance of D - h.

[0005] Preferably, the squeegee lifting assembly includes a connecting rod, and a lifting motor, a transmission module one and a guide wheel which are located in front of the walking trolley and indirectly installed on the walking trolley; the connecting rod is vertical, with rack sections on both sides of the upper part, a convex block in the middle, and the lower end is fixedly connected to the upper side of the squeegee. The input end of the transmission module one is connected to the lifting motor, and the output end is two gears one that can move synchronously and in opposite directions. The two gears one are respectively engaged with the rack sections on both sides of the upper part of the connecting rod. The guide wheel is located between the rack section and the convex block and is used for guiding the lifting movement of the connecting rod. The convex block is used for limiting the upper limit position of the connecting rod. The transmission module one has a high transmission ratio and can ensure the millimeter-level movement of the connecting rod.

[0006] Preferably, the first drive module includes gear a, gear b and two first gears; gear a is connected to the output end of the lifting motor, gear a is connected in the same direction to one of the first gears through a transmission belt or a transmission chain, and is connected in the opposite direction to gear b through a transmission belt or a transmission chain. Gear b is connected in the same direction to the other first gear through a transmission belt or a transmission chain. The transmission ratio between gear a and gear b is 1, and the transmission ratios between gear a and one of the first gears and between gear b and the other first gear are the same.

[0007] Preferably, the lifting motor, the first drive module and the guide wheel are installed on the front housing. The lower end of the front housing is open to allow the connecting rod to extend. The front housing is connected to the walking trolley through a bracket.

[0008] Preferably, the distance measuring mechanism includes two slide bars, a laser emitter, a laser receiver, as well as a distance measuring motor, a second drive module and a support roller installed on the walking trolley; the two slide bars are both horizontal, of equal length and height, and at the same height. The lower sides of the two slide bars are slidably supported on the support roller, and the upper sides are both rack sections. The laser emitter and the laser receiver are respectively arranged at the mutually remote ends of the two slide bars; the working direction of the laser emitter is 45° downward and forward, and the working direction of the laser receiver is 45° downward and backward, or vice versa; the input end of the second drive module is connected to the distance measuring motor, and the output end is two second gears that can move synchronously and in opposite directions. The two second gears are respectively meshed with the rack sections of the two slide bars. The second drive module has a high transmission ratio and can ensure the movement of the slide bar in millimeters; initially, the two slide bars are abutted against each other. The intersection point of the working directions of the laser emitter and the laser receiver at the initial position is the reference point A. The moving distance L of the slide bar relative to the initial position when the two slide bars move away synchronously until the laser receiver receives the laser from the laser emitter is the distance L from the reference point A to the ground.

[0009] Preferably, the second drive module includes gear c and two second gears; gear c is connected to the output end of the distance measuring motor, gear c is connected in the same direction to one of the second gears through a transmission belt or a transmission chain, and the two second gears are connected in the opposite direction through a transmission belt or a transmission chain. The transmission ratio between the two second gears is 1.

[0010] Preferably, the distance measuring motor, the second drive module and the support roller are installed on the rear housing. The lower end of the rear housing is open to allow the laser emitter and the laser receiver to work. The rear housing is installed on the lower side of the walking trolley.

[0011] Preferably, a flow valve is provided on the pipeline between the pump and the aggregate pipe. A liquid level detection component for detecting whether the paint is at a low liquid level is provided in the paint tank. The control system is electrically connected to the pump, the flow valve and the liquid level detection component respectively. The control system can control the pump to start when receiving a start command, can control the opening degree of the flow valve to make the paint at a set flow rate, and can control the pump to close when the paint is at a low liquid level.

[0012] Preferably, a heating member for heating the paint and a temperature detecting member for detecting the temperature of the paint are provided in the paint tank. The control system is electrically connected to the heating member and the temperature detecting member respectively. The control system can control the heating member according to the feedback of the temperature detecting member to keep the paint within a set temperature range.

[0013] Preferably, a handle for convenient operation is provided at the rear of the walking trolley.

[0014] The beneficial effects of the present invention are as follows: During operation, the walking trolley is moved to the construction ground, and the scraper is at the upper limit position. The distance L from the reference point A to the ground is measured by the ranging mechanism. The set paint thickness h is input into the control system. The control system controls the scraper lifting assembly to drive the scraper at the upper limit position to descend by a distance of D - h. The distance from the lower end of the scraper to the ground is h. Then the pump is started. The pump sends the paint stored in the paint tank into the collecting pipe and each nozzle. Each nozzle sprays the paint onto the ground. Then the walking trolley is reversed. The scraper continuously levels the paint on the ground as the walking trolley reverses. After the walking trolley reverses to the end, it turns around and continues to reverse along the adjacent construction ground. Since the walking trolley reverses during construction and the working range of the nozzle can cover the width of the walking trolley, the components such as the wheels of the walking trolley will not be contaminated with paint during reverse and turning, and it can ensure that the paint can completely cover the construction ground. This device uses a scraper to level the paint. As long as the distance between the scraper and the ground is ensured, the thickness of the paint on the ground can be guaranteed to be uniform, and the paint thickness can be controlled by controlling the distance between the scraper and the ground. In order to achieve millimeter-level control of the distance between the scraper and the ground, this device uses a scraper lifting assembly, a ranging mechanism and a control system. The scraper lifting assembly can drive the scraper to move in millimeters. The ranging mechanism can measure the distance L from the reference point A to the ground with millimeter-level accuracy. Then, using the height difference relationship between point B and the reference point A, the distance D from point B to the ground is obtained. After that, when setting the paint thickness h, the control system controls the scraper lifting assembly to drive the scraper at the upper limit position to descend by a distance of D - h, so that the distance from the lower end of the scraper to the ground is h, that is, the paint thickness is controlled to be h. Description of the Drawings

[0015] Figure 1 is a side view of the ground paving device capable of controlling the paint thickness in the present invention.

[0016] Figure 2 is a top view of the ground paving device capable of controlling the paint thickness in the present invention.

[0017] Figure 3 is a schematic structural diagram of the scraper mechanism and the ranging mechanism in the present invention.

[0018] Figure 4 is a schematic connection diagram of the scraper and the connecting rod in the present invention.

[0019] Figure 5 This is the ranging principle diagram of the ranging mechanism in the present invention.

[0020] In the figure: 1 - scraper; 2 - nozzle; 3 - connecting rod; 4 - front housing; 5 - bracket; 6 - aggregate pipe; 7 - flow valve; 8 - pump; 9 - paint tank; 10 - temperature detector; 11 - heating element; 12 - liquid level detector; 13 - walking trolley; 14 - rear housing; 15 - handle; 16 - lifting motor; 17 - gear a; 18 - gear b; 19 - gear one; 20 - guide wheel; 21 - bump; 22 - ranging motor; 23 - gear c; 24 - gear two; 25 - laser receiver; 26 - support roller; 27 - slide bar; 28 - laser emitter. Specific embodiments

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application claimed, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application.

[0023] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0024] In addition, the terms "gear one", "gear two", "gear a", "gear b", "gear c", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0026] The features and performance of the present application will be further described in detail below in conjunction with the embodiments.

[0027] This embodiment discloses a floor paving device capable of controlling the thickness of the coating, as Figures 1 to 3 shown, which includes a walking trolley 13, a spraying mechanism, a scraping mechanism, a ranging mechanism, and a control system; wherein: the walking trolley 13 serves as the bearing foundation of the entire device and can carry the spraying mechanism, the scraping mechanism, the ranging mechanism, and the control system to move freely on the ground, as shown in Figure 1 and Figure 2 ; the spraying mechanism is used to spray the coating onto the ground, and it includes a coating tank 9, a pump 8, an aggregate pipe 6, and nozzles 2. The coating tank 9 is used to store the coating. The coating tank 9, the pump 8, and the aggregate pipe 6 are connected in sequence through pipes. A row of nozzles 2 is arranged on the aggregate pipe 6. The nozzles 2 are located in front of the walking trolley 13 and face downward. The working range of the nozzles 2 can cover the width of the walking trolley 13, as shown in Figure 1 and Figure 2 ; the scraping mechanism is used to level the coating with a scraper 1, and it includes the scraper 1 and a scraper lifting component. The scraper 1 is located near the front of the nozzles 2. The scraper lifting component is used to drive the scraper 1 to lift and lower. The scraper 1 has an upper limit position, and the scraper lifting component can drive the scraper 1 to move at the millimeter level, as shown in Figures 1 to 3 ; the ranging mechanism has a reference point A. When the scraper 1 is at the upper limit position, the lower end of the scraper 1 is point B. The height difference between point B and the reference point A is fixed and is H. The ranging mechanism is used to measure the distance L from the reference point A to the ground, and the accuracy is above the millimeter level, as shown in Figure 3 and Figure 5 ; the control system can obtain the distance D from point B to the ground (D = L + H) based on the measured distance L and the known height difference H, and when setting the coating thickness h, control the scraper lifting component to drive the scraper 1 at the upper limit position to descend a distance of D - h. The control system is not shown in the figure. It is installed on the walking trolley 13 and is electrically connected to each component.

[0028] During operation: Move the walking trolley 13 to the construction ground, make the scraper 1 at the upper limit position, measure the distance L from the reference point A to the ground through the ranging mechanism, input the set coating thickness h into the control system. The control system controls the scraper lifting component to drive the scraper 1 at the upper limit position to descend a distance of D - h. The distance between the lower end of the scraper 1 and the ground is h. Then start the pump 8. The pump 8 sends the coating stored in the coating tank 9 into the aggregate pipe 6 and each nozzle 2. Each nozzle 2 sprays the coating onto the ground. Then let the walking trolley 13 move backward. The scraper 1 continuously levels the coating on the ground as the walking trolley 13 moves backward. After the walking trolley 13 moves backward to the end, it turns around and continues to move backward along the adjacent construction ground. Since the walking trolley 13 moves backward for construction and the working range of the nozzles 2 can cover the width of the walking trolley 13, the components such as the wheels of the walking trolley 13 will not be contaminated with the coating during backward movement and turning around, and it can ensure that the coating can completely cover the construction ground.

[0029] The device uses a squeegee 1 to level the paint. As long as the distance between the squeegee 1 and the ground is ensured, the thickness of the paint on the ground can be guaranteed to be uniform, and the paint thickness can be controlled by controlling the distance between the squeegee 1 and the ground. In order to achieve millimeter-level control of the distance between the squeegee 1 and the ground, the device adopts a squeegee lifting assembly, a ranging mechanism and a control system. The squeegee lifting assembly can drive the squeegee 1 to move in millimeters. The ranging mechanism can measure the distance L from the reference point A to the ground with millimeter-level accuracy, and then obtain the distance D from the point B to the ground by using the height difference relationship between the point B and the reference point A. After that, when the control system sets the paint thickness h, it controls the squeegee lifting assembly to drive the squeegee 1 at the upper limit position to descend by a distance of D - h, so that the distance between the lower end of the squeegee 1 and the ground is h, that is, the paint thickness is controlled to be h. Among them, theoretically speaking, after the squeegee mechanism is installed, the distance from the point B to the ground is fixed and does not need to be measured every time it is used. However, in practice, it is found that there will be a millimeter-level difference in the distance from the point B to the ground when transferred to different occasions. If millimeter-level control of the paint thickness is to be achieved, these differences cannot be ignored, so it needs to be measured every time it is used. Among them, the ranging mechanism does not directly measure the distance from the point B to the ground, because the lower end of the squeegee 1 needs to scrape the paint and it is not easy to install ranging components near the squeegee. Therefore, a reference point A is introduced, and the distance from the point B to the ground is indirectly measured by measuring the distance from the reference point A to the ground. Among them, after the squeegee mechanism and the ranging mechanism are installed, the height difference between the point B and the reference point A is fixed, and only one measurement is needed to obtain the height difference H between the two. The device can achieve millimeter-level control of the distance between the squeegee 1 and the ground, and the minimum value of the paint thickness that can be controlled is 1 millimeter.

[0030] Regarding the squeegee lifting assembly, preferably: Such as Figure 3 And Figure 4As shown in the figure: The scraper lifting assembly includes a connecting rod 3, a lifting motor 16 located in front of the walking trolley 13 and indirectly installed on the walking trolley 13, a first transmission module, and a guide wheel 20; the connecting rod 3 is vertical, with rack sections on both sides of the upper part, a convex block 21 in the middle, and the lower end is fixedly connected to the upper side of the scraper 1. The input end of the first transmission module is connected to the lifting motor 16, and the output end is two gears 19 that can move synchronously and in opposite directions. The two gears 19 are respectively engaged with the rack sections on both sides of the upper part of the connecting rod 3. The guide wheel 20 is located between the rack section and the convex block 21 and is used to guide the lifting movement of the connecting rod 3. The convex block 21 is used to limit the upper extreme position of the connecting rod 3. The first transmission module has a high transmission ratio and can ensure the movement of the connecting rod 3 at the millimeter level. The lifting motor 16 drives the connecting rod 3 and the scraper 1 to lift through the first transmission module. The guide wheel 20 plays a guiding role and can reduce the friction generated by guiding. The first transmission module has a high transmission ratio, enabling the scraper 1 to move at the millimeter level. The two gears 19 on both sides can not only drive the connecting rod 3 to lift but also lock the position of the connecting rod 3. When the convex block 21 is limited, the connecting rod 3 and the scraper 1 are at the upper extreme position. Since there is a fixed conversion ratio between the working angle of the lifting motor 16 and the lifting distance of the scraper 1, the control system can calculate the working angle of the lifting motor 16 according to the required lifting distance of the scraper 1 and the conversion ratio.

[0031] Among them, there are many optional structures for the first transmission module. In this embodiment, as Figure 3 shown: The first transmission module includes a gear a 17, a gear b 18, and two gears 19; the gear a 17 is connected to the output end of the lifting motor 16. The gear a 17 is connected in the same direction to one side of the gear 19 through a transmission belt or a transmission chain and is connected in the opposite direction to the gear b 18 through a transmission belt or a transmission chain. The gear b 18 is connected in the same direction to the other side of the gear 19 through a transmission belt or a transmission chain. The transmission ratio between the gear a 17 and the gear b 18 is 1, and the transmission ratios between the gear a 17 and one side of the gear 19 and between the gear b 18 and the other side of the gear 19 are the same.

[0032] Among them, in this embodiment, as Figures 1 to 3 shown: The lifting motor 16, the first transmission module, and the guide wheel 20 are installed on the front housing 4. The lower end of the front housing 4 is open to allow the connecting rod 3 to extend. The front housing 4 is connected to the walking trolley 13 through a bracket 5.

[0033] Regarding the ranging mechanism, preferably: As Figure 3As shown in the figure: The ranging mechanism includes two sliding rods 27, a laser emitter 28, a laser receiver 25, a ranging motor 22, a second transmission module, and a support roller 26 mounted on the traveling trolley 13. The two sliding rods 27 are both horizontal, of equal length and height, and at the same height. The lower sides of the two sliding rods 27 are slidably supported on the support roller 26, and the upper sides are both rack sections. The laser emitter 28 and the laser receiver 25 are respectively arranged at the ends of the two sliding rods 27 away from each other. The working direction of the laser emitter 28 is 45° downward and forward, and the working direction of the laser receiver 25 is 45° downward and backward, or vice versa. The input end of the second transmission module is connected to the ranging motor 22, and the output end is two gears 24 that can move synchronously and in opposite directions. The two gears 24 are respectively engaged with the rack sections of the two sliding rods 27. The second transmission module has a high transmission ratio and can ensure the movement of the sliding rods 27 at the millimeter level. Initially, the two sliding rods 27 are pressed against each other. At the initial position, the intersection point of the working directions of the laser emitter 28 and the laser receiver 25 is the reference point A. When the two sliding rods 27 move away synchronously until the laser receiver 25 receives the laser from the laser emitter 28, the moving distance L of the sliding rods 27 relative to the initial position is the distance L from the reference point A to the ground. The ranging motor 22 drives the two sliding rods 27 to move away from each other or close to each other synchronously through the second transmission module. The upper and lower sides of the sliding rods 27 are restricted between the gears 24 and the support roller 26. The support roller 26 plays a supporting role and can reduce the friction force. The gears 24 can not only drive the sliding rods 27 to move but also lock the positions of the sliding rods 27. The two sliding rods 27 being pressed against each other is the initial position, as Figure 5 shown. Since the two sliding rods 27 are both horizontal, of equal length and height, and at the same height, the laser emitter 28 and the laser receiver 25 are respectively arranged at the ends of the two sliding rods 27 away from each other, and the working direction of the laser emitter 28 is 45° downward and forward, and the working direction of the laser receiver 25 is 45° downward and backward. Therefore, when the laser receiver 25 receives the laser from the laser emitter 28, the moving distance L of the sliding rods 27 relative to the initial position is the distance L from the reference point A to the ground. Since there is a fixed conversion ratio between the working angle of the ranging motor 22 and the moving distance of the sliding rods 27, the control system can calculate L based on the working angle of the ranging motor 22 and the conversion ratio.

[0034] Among them, there are many optional structures for the second transmission module. In this embodiment, as Figure 3 shown: The second transmission module includes a gear c23 and two gears 24. The gear c23 is connected to the output end of the ranging motor 22. The gear c23 is connected in the same direction to one of the gears 24 through a transmission belt or a transmission chain, and the two gears 24 are connected in opposite directions through a transmission belt or a transmission chain. The transmission ratio between the two gears 24 is 1.

[0035] Among them, in this embodiment, as Figures 1 to 3As shown: The distance measuring motor 22, the second transmission module, and the support roller 26 are installed on the rear housing 14. The lower end of the rear housing 14 is open to allow the laser emitter 28 and the laser receiver 25 to work. The rear housing 14 is installed on the lower side of the walking trolley 13.

[0036] Regarding the spraying mechanism, preferably: As Figure 1 and Figure 2 shown: A flow valve 7 is provided on the pipeline between the pump 8 and the aggregate pipe 6. A liquid level detection member 12 for detecting whether the paint is at a low liquid level is provided in the paint tank 9. The control system is electrically connected to the pump 8, the flow valve 7, and the liquid level detection member 12 respectively. The control system can control the pump 8 to start when receiving a start instruction, can control the opening degree of the flow valve 7 so that the paint is at a set flow rate, and can control the pump 8 to close when the paint is at a low liquid level.

[0037] As Figure 1 shown: A heating member 11 for heating the paint and a temperature detection member 10 for detecting the paint temperature are provided in the paint tank 9. The control system is electrically connected to the heating member 11 and the temperature detection member 10 respectively. The control system can control the heating member 11 according to the feedback of the temperature detection member 10 to keep the paint within a set temperature range. Whether to heat and the heating temperature range can be selected according to the type of paint.

[0038] Regarding the walking trolley 13, preferably: As Figure 1 and Figure 2 shown: A handle 15 for convenient pushing and pulling operation is provided at the rear of the walking trolley 13. Of course, the walking trolley 13 can also adopt an electric drive walking structure.

[0039] The embodiments described above are some embodiments of the present application, rather than all embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application claimed, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts fall within the scope of protection of the present application.

Claims

1. A floor paving device capable of controlling the thickness of the coating, characterized in that: It includes a walking trolley, on which a paint spraying mechanism, a scraping mechanism, a ranging mechanism and a control system are provided; the paint spraying mechanism is used to spray paint on the ground, and it includes a paint tank, a pump and an aggregate pipe connected in sequence through a pipeline, and a row of nozzles arranged on the aggregate pipe. The nozzles are located in front of the walking trolley and face downwards, and the working range of the nozzles can cover the width of the walking trolley; the scraping mechanism is used to scrape the paint flat with a scraper, and it includes a scraper near the front of the nozzles and a scraper lifting component for driving the scraper to lift and lower. The scraper has an upper limit position, and the scraper lifting component can drive the scraper to move in millimeters; the ranging mechanism has a reference point A. When the scraper is at the upper limit position, the lower end of the scraper is point B, and the height difference between point B and the reference point A is fixed and is H. The ranging mechanism is used to measure the distance L from the reference point A to the ground, and the accuracy is above the millimeter level; the control system can obtain the distance D from point B to the ground according to the measured distance L and the known height difference H, and when setting the paint thickness h, control the scraper lifting component to drive the scraper at the upper limit position to descend a distance of D - h.

2. The floor covering device capable of controlling the coating thickness according to claim 1, characterized in that: The scraper lifting component includes a connecting rod, and a lifting motor, a transmission module one and a guide wheel that are located in front of the walking trolley and are indirectly installed on the walking trolley; the connecting rod is vertical, with rack sections on both sides of the upper part, a convex block in the middle, and the lower end is fixedly connected to the upper side of the scraper. The input end of the transmission module one is connected to the lifting motor, and the output end is two gears one that can move synchronously and in opposite directions. The two gears one are respectively meshed with the rack sections on both sides of the upper part of the connecting rod. The guide wheel is located between the rack section and the convex block and is used to guide the lifting movement of the connecting rod. The convex block is used to limit the upper limit position of the connecting rod. The transmission module one has a high transmission ratio and can ensure the connecting rod moves in millimeters.

3. The floor covering device capable of controlling the paint thickness according to claim 2, wherein: The transmission module one includes a gear a, a gear b and two gears one; the gear a is connected to the output end of the lifting motor. The gear a is connected in the same direction to one of the gears one through a transmission belt or a transmission chain, and is connected in the opposite direction to the gear b through a transmission belt or a transmission chain. The gear b is connected in the same direction to the other gear one through a transmission belt or a transmission chain. The transmission ratio between the gear a and the gear b is 1, and the transmission ratios between the gear a and one of the gears one and between the gear b and the other gear one are the same.

4. The floor covering device capable of controlling the paint thickness according to claim 2, wherein: The lifting motor, the transmission module one and the guide wheel are installed on the front housing. The lower end of the front housing is open to allow the connecting rod to extend. The front housing is connected to the walking trolley through a bracket.

5. The floor covering device capable of controlling the paint thickness according to claim 1, characterized in that: The ranging mechanism includes two sliding rods, a laser emitter, a laser receiver, a ranging motor, a second transmission module, and a support roller installed on the walking trolley; the two sliding rods are both horizontal, of equal length and height, and at the same height. The lower sides of the two sliding rods are slidably supported on the support roller, and the upper sides are both rack segments. The laser emitter and the laser receiver are respectively arranged at the ends of the two sliding rods away from each other; the working direction of the laser emitter is 45° downward and forward, and the working direction of the laser receiver is 45° downward and backward, or vice versa; the input end of the second transmission module is connected to the ranging motor, and the output end is two gears two that can move synchronously and in opposite directions. The two gears two are respectively engaged with the rack segments of the two sliding rods. The second transmission module has a high transmission ratio and can ensure the movement of the sliding rods in millimeters; initially, the two sliding rods are in contact with each other. The intersection of the working directions of the laser emitter and the laser receiver at the initial position is the reference point A. The moving distance L of the sliding rods relative to the initial position when the two sliding rods move away synchronously until the laser receiver receives the laser from the laser emitter is the distance L from the reference point A to the ground.

6. The floor covering device capable of controlling the paint thickness according to claim 5, characterized in that: The second transmission module includes a gear c and two gears two; the gear c is connected to the output end of the ranging motor. The gear c is connected in the same direction to one of the gears two through a transmission belt or a transmission chain, and the two gears two are connected in opposite directions through a transmission belt or a transmission chain. The transmission ratio between the two gears two is 1.

7. The floor covering device capable of controlling the paint thickness according to claim 5, characterized in that: The ranging motor, the second transmission module, and the support roller are installed on the rear housing. The lower end of the rear housing is open to allow the laser emitter and the laser receiver to work. The rear housing is installed on the lower side of the walking trolley.

8. The floor covering device capable of controlling the coating thickness according to claim 1, characterized in that: A flow valve is provided on the pipeline between the pump and the aggregate pipe. A liquid level detection component for detecting whether the paint is at a low liquid level is provided in the paint tank. The control system is electrically connected to the pump, the flow valve, and the liquid level detection component respectively. The control system can control the pump to start when receiving a start command, can control the opening degree of the flow valve to make the paint flow at a set rate, and can control the pump to shut down when the paint is at a low liquid level.

9. The floor covering device capable of controlling the paint thickness according to claim 1, wherein: A heating component for heating the paint and a temperature detection component for detecting the temperature of the paint are provided in the paint tank. The control system is electrically connected to the heating component and the temperature detection component respectively. The control system can control the heating component according to the feedback of the temperature detection component to keep the paint within a set temperature range.

10. The floor covering device capable of controlling the coating thickness according to claim 1, characterized in that: A convenient operation handle is provided at the rear of the walking trolley.

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