A trowel for applying plaster to a building wall surface, the trowel having a blade which is adapted to be used in a controlled manner

Abstract

This utility model discloses a plastering tool for building walls that facilitates thickness control in the field of plastering devices. It includes a main plastering tool and a handle. The handle is fixedly connected to the top of the main plastering tool. Two mounting brackets are fixedly connected to the top of the main plastering tool. Return springs are fixedly connected to the inner side of each mounting bracket, and the return springs are arranged sequentially. A limiting plate is fixedly connected to the bottom end of each return spring. A sliding rod is fixedly connected to the top of the limiting plate. The top end of the sliding rod passes through the mounting bracket and extends to the top of the mounting bracket. A connecting plate is fixedly connected between the top ends of the two sliding rods. Two mounting plates are fixedly connected to the top of the mounting bracket. A bidirectional screw is rotatably connected between the inner sides of the two mounting plates. This plastering tool for building walls, which facilitates thickness control, has a reasonable structural design and allows for adjustment of plastering thickness according to requirements. It also allows for quick and convenient installation and disassembly of the main and auxiliary plastering tools from the outside.

Description

Technical Field

[0001] This utility model relates to the field of plastering devices, specifically a scraper for plastering building walls that facilitates thickness control. Background Technology

[0002] Plastering refers to applying plastering mortar to the surface of a base material. It serves to protect the base layer and enhance aesthetics. Plastering has two main functions: first, protection, protecting the wall from wind, rain, and snow erosion, increasing the wall's moisture resistance, weathering resistance, and heat insulation capabilities, and improving the wall's durability and thermal performance; second, aesthetics, improving indoor hygiene, purifying the air, beautifying the environment, and enhancing living comfort.

[0003] The prior art patent application (application number 202320526594.4) entitled "A Wall Plastering Equipment for Building Construction" includes a main scraper, a handle, and a multi-functional combination structure. This utility model utilizes a multi-functional combination structure on the side of the main scraper. When plastering an external corner, the secondary scraper is flipped up and combined with the main scraper, forming a concave internal corner shape. This allows the main and secondary scrapers to adhere to the external corner of the wall for plastering. When plastering an internal corner, the secondary scraper is flipped down and combined with the main scraper, again forming a concave internal corner shape. The plastering personnel can assemble the secondary and main scrapers into shapes that match the internal and external corners according to the construction needs, ensuring that the plaster layer at the internal and external corners achieves the desired plastering effect.

[0004] However, most of their main scrapers adopt a fixed limiting structure, which can meet the plastering requirements of a single thickness, but cannot be flexibly adapted when the plastering thickness needs to be frequently adjusted in the construction scene. Construction workers have to replace multiple sets of scrapers, which seriously affects the work efficiency. On the other hand, the connection mechanism between the main scraper and the auxiliary scraper mostly relies on the splicing and combination of clamps. In the long-term high-frequency disassembly and installation process, the clamps are subjected to alternating stress due to repeated bending, which easily produces fatigue cracks. With the increase of use, the cracks continue to expand, eventually leading to the breakage of the clamps. For this reason, we have proposed a scraper for building wall plastering that is easy to control the thickness. Utility Model Content

[0005] The purpose of this utility model is to provide a scraper for plastering building walls that is easy to control in terms of thickness, in order to solve the problems mentioned in the background art. However, the main scraper of the scraper mostly adopts a fixed limiting structure, which cannot be flexibly adapted and affects the work efficiency. On the other hand, the connection mechanism between the main scraper and the auxiliary scraper mostly relies on the splicing and combination of the clamping plate. In the long-term high-frequency disassembly and installation process, the clamping plate is subjected to alternating stress due to repeated bending, which easily causes fatigue cracks and leads to the breakage of the clamping plate.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a scraper for easy thickness control in building wall plastering, comprising a main scraper and a handle, the handle being fixedly connected to the top of the main scraper, two mounting brackets being fixedly connected to the top of the main scraper, a return spring being fixedly connected to the inner side of the mounting bracket, the return springs being arranged sequentially, a limit plate being fixedly connected to the bottom end of the return spring, a sliding rod being fixedly connected to the top of the limit plate, the top end of the sliding rod penetrating the mounting bracket and extending to the top of the mounting bracket, a connecting plate being fixedly connected between the top ends of the two sliding rods, two mounting plates being fixedly connected to the top of the mounting bracket, a bidirectional screw being rotatably connected between the inner sides of the two mounting plates, one end of the bidirectional screw penetrating one side of the mounting plate and extending to the outer side of the one side of the mounting plate.

[0007] As a further description of the above technical solution:

[0008] Two V-shaped locking blocks are screwed to the outer side of the bidirectional screw, and a rubber damping pad is glued to the inner side of the V-shaped locking block. The rubber damping pad abuts against the slide rod.

[0009] As a further description of the above technical solution:

[0010] One end of the handle is connected to a connecting rod, one end of which is fixedly connected to a secondary scraper, and a positioning chamber is fixedly connected to the outside of the connecting rod.

[0011] As a further description of the above technical solution:

[0012] The inner wall of the positioning chamber is fixedly connected to a first adsorption magnet, the inner cavity of the positioning chamber is provided with an annular groove, one side of the positioning chamber is provided with a through groove, and the outer side of the grip is fixedly connected to a fixing plate.

[0013] As a further description of the above technical solution:

[0014] A limiting chamber is fixedly connected to one side of the fixed plate. Two limiting grooves are opened on the outer side of the limiting chamber. A telescopic rotating rod is rotatably connected to one side of the fixed plate. Two limiting rods are fixedly connected to the outer side of the telescopic rotating rod. The limiting rods are located inside the limiting grooves.

[0015] As a further description of the above technical solution:

[0016] One end of the telescopic rotating rod passes through the fixed plate and extends into the inner cavity of the positioning chamber, and a second adsorption magnet is fixedly connected to one end of the telescopic rotating rod.

[0017] As a further description of the above technical solution:

[0018] The second adsorption magnet is adsorbed and connected to the first adsorption magnet, and two locking rods are fixedly connected to the outside of the telescopic rotating rod, with the locking rods located in the inner cavity of the annular groove.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] 1. The wall plastering of this building uses a scraper for easy thickness control. During the thickness adjustment stage, the construction worker rotates the double-ended screw (operated via the outer hexagonal head or handle). Because the threads on both sides of the double-ended screw are opposite, it drives two V-shaped locking blocks to move in opposite or opposite directions along the screw axis. When the V-shaped locking blocks move in opposite directions, the rubber damping pads on their inner sides separate from the slide rod, releasing the locking state of the slide rod. During the height adjustment stage, after the slide rod is unlocked, the preload of the return spring pushes the limiting plate downward, increasing the distance between the bottom surface of the limiting plate and the bottom surface of the main scraper (i.e., increasing the plaster thickness). The construction worker can manually pull the connecting plate upward according to the scale markings (which need to be set on the outside of the slide rod or mounting bracket) to compress the return spring, reduce the extension height of the limiting plate, and thus reduce the plaster thickness. During the locking and positioning stage, when the limiting plate... After adjusting to the target height, rotate the bidirectional screw in the opposite direction to drive the V-shaped locking blocks to move towards each other. The rubber damping pad gradually presses the slide bar, using friction to lock the slide bar position. The high coefficient of friction and elastic deformation characteristics of the rubber material ensure reliable locking even under vibration, while avoiding damage to the slide bar surface caused by rigid contact. During the working state holding stage, when plastering, the bottom surface of the limiting plate contacts the wall surface, bearing the lateral pressure of the mortar and the friction of the scraper. The return spring provides stable support through the limiting plate, keeping the main scraper at a constant distance from the wall surface, achieving precise thickness control. When it is necessary to change the plaster thickness, repeat the above steps to unlock the slide bar. The return spring can automatically push the limiting plate to the maximum extension position (initial state), facilitating quick adjustment to other preset thickness levels.

[0021] 2. The plastering of the building walls uses a scraper that facilitates thickness control. When connecting the main scraper and the auxiliary scraper, first insert the connecting rod into the handle. At this time, the positioning chamber moves to the corresponding position, and simultaneously, the second magnetic magnet at one end of the telescopic rotating rod aligns with the first magnetic magnet for magnetic connection. The position of the telescopic rotating rod is fixed by magnetic force. Then, rotate the locking rod from the through groove to the annular groove, so that the locking rod acts as a limit in the annular groove to prevent the telescopic rotating rod from moving axially. Then, push the telescopic rotating rod to shorten it, so that the limiting rod on the telescopic rotating rod moves to the limit position. The limiting groove on the chamber prevents the telescopic rotating rod from rotating, thus ensuring a stable connection between the main scraper and the auxiliary scraper. When the auxiliary scraper needs to be disassembled, the telescopic rotating rod is stretched to move the limiting rod out of the limiting groove. Then, the telescopic rotating rod is rotated to make the locking rod rotate in the annular groove to the through groove, releasing its limiting effect. Then, the telescopic rotating rod is pulled outward to overcome the magnetic force between the first and second adsorption magnets, pulling the telescopic rotating rod out of the positioning chamber and causing the locking rod to disengage from the positioning chamber. Finally, the connecting rod is pulled out of the handle to separate the main scraper and the auxiliary scraper. Attached Figure Description

[0022] Figure 1 This is a front-view three-dimensional structural diagram of a scraper for easy thickness control in building wall plastering proposed in this utility model.

[0023] Figure 2 This is a right-view three-dimensional structural diagram of a scraper for easy thickness control in building wall plastering proposed in this utility model.

[0024] Figure 3 A cross-sectional view of the limiting plate position adjustment mechanism for a scraper used for plastering building walls, which facilitates thickness control, as proposed in this utility model.

[0025] Figure 4 A cross-sectional structural diagram of a scraper connection mechanism for easy thickness control in building wall plastering proposed in this utility model;

[0026] Figure 5 A cross-sectional view of the detached scraper connecting mechanism for easy thickness control in building wall plastering, as proposed in this utility model.

[0027] In the diagram: 100, main scraper; 110, mounting bracket; 111, return spring; 120, limiting plate; 130, sliding rod; 131, connecting plate; 140, mounting plate; 141, double-acting screw; 150, V-shaped locking block; 151, rubber damping pad; 200, handle; 210, connecting rod; 220, secondary scraper; 230, positioning chamber; 231, first adsorption magnet; 240, annular groove; 250, through groove; 260, fixing plate; 261, limiting chamber; 262, limiting groove; 270, telescopic rotating rod; 271, limiting rod; 272, second adsorption magnet; 280, locking rod. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] This utility model provides a scraper for easy thickness control in building wall plastering. The plaster thickness can be adjusted according to requirements, and the main and auxiliary scrapers can be quickly and easily installed and disassembled from the outside. Please refer to [link / reference]. Figure 1-5This includes a main scraper 100 and a handle 200;

[0032] Please refer to it again. Figure 1-3 Two mounting brackets 110 are fixedly connected to the top of the main scraper 100. Return springs 111 are fixedly connected to the inner side of each mounting bracket 110, and these return springs 111 are arranged sequentially. A limit plate 120 is fixedly connected to the bottom end of each return spring 111. A sliding rod 130 is fixedly connected to the top of the limit plate 120. The top end of the sliding rod 130 passes through the mounting bracket 110 and extends to the top of the mounting bracket 110. A connecting plate 131 is fixedly connected between the top ends of the two sliding rods 130. Two mounting plates 140 are fixedly connected to the top of the mounting bracket 110. A bidirectional screw 141 is rotatably connected between the inner sides of the two mounting plates 140. One end of the bidirectional screw 141 passes through one side of the mounting bracket. Plate 140 extends to the outer side of one side mounting plate 140. Two V-shaped locking blocks 150 are screwed to the outer side of the bidirectional screw 141. Rubber damping pads 151 are bonded to the inner side of the V-shaped locking blocks 150. The rubber damping pads 151 abut against the slide rod 130. During the thickness adjustment stage, the construction personnel rotate the bidirectional screw 141 (operated through the outer hexagonal head or handle). Since the threads on both sides of the bidirectional screw are opposite, the two V-shaped locking blocks 150 are driven to move in opposite or opposite directions along the screw axis. When the V-shaped locking blocks 150 move in opposite directions, the rubber damping pads 151 on their inner sides separate from the slide rod 130, releasing the locking state of the slide rod 130. During the height adjustment stage, the slide rod 130 is unlocked. Afterwards, the preload of the return spring 111 pushes the limiting plate 120 downwards, increasing the distance between the bottom surface of the limiting plate 120 and the bottom surface of the main scraper 100 (i.e., increasing the plaster thickness). Construction workers can manually pull the connecting plate 131 upwards according to the scale markings (which need to be set on the outside of the slide rod 130 or mounting bracket 110), compressing the return spring 111 and reducing the extension height of the limiting plate 120, thereby reducing the plaster thickness. During the locking and positioning stage, once the limiting plate 120 is adjusted to the target height, the bidirectional screw 141 is rotated in the opposite direction, driving the V-shaped locking blocks 150 to move in opposite directions. The rubber damping pad 151 gradually presses against the slide rod 130, using friction to lock the slide rod position. The high coefficient of friction and elastic deformation characteristics ensure reliable locking even under vibration, while avoiding damage to the slide bar surface caused by rigid contact. During the working state maintenance stage, when plastering, the bottom surface of the limiting plate 120 contacts the wall surface, bearing the lateral pressure of the mortar and the friction of the scraper. The return spring 111 provides stable support through the limiting plate 120, keeping the main scraper 100 at a constant distance from the wall surface, achieving precise thickness control. When the plastering thickness needs to be changed, the above steps are repeated to unlock the slide bar 130, and the return spring 111 can automatically push the limiting plate 120 to the maximum extension position (initial state), which is convenient for quick adjustment to other preset thickness levels.

[0033] Please refer to it again. Figure 1-5A handle 200 is fixedly connected to the top of the main scraper 100. A connecting rod 210 is inserted into one end of the handle 200. A secondary scraper 220 is fixedly connected to one end of the connecting rod 210. A positioning chamber 230 is fixedly connected to the outer side of the connecting rod 210. A first adsorption magnet 231 is fixedly connected to the inner wall of the positioning chamber 230. An annular groove 240 is formed in the inner cavity of the positioning chamber 230. A through groove 250 is formed on one side of the positioning chamber 230. A fixing plate 260 is fixedly connected to the outer side of the handle 200. A limiting chamber 261 is fixedly connected to one side of the fixing plate 260. Two limiting grooves 262 are formed on the outer side of the limiting chamber 261. A rotating... A telescopic rotating rod 270 is movably connected. Two limiting rods 271 are fixedly connected to the outer side of the telescopic rotating rod 270. The limiting rods 271 are located inside the limiting groove 262. One end of the telescopic rotating rod 270 passes through the fixing plate 260 and extends into the inner cavity of the positioning chamber 230. A second adsorption magnet 272 is fixedly connected to one end of the telescopic rotating rod 270. The second adsorption magnet 272 is adsorbed and connected to the first adsorption magnet 231. Two locking rods 280 are fixedly connected to the outer side of the telescopic rotating rod 270. The locking rods 280 are located in the inner cavity of the annular groove 240. When it is necessary to connect the main scraper 100 and the auxiliary scraper 220, the connecting rod 210 is first inserted into the handle 2. In step 00, the positioning chamber 230 moves to the corresponding position, and simultaneously the second adsorption magnet 272 at one end of the telescopic rotating rod 270 aligns with the first adsorption magnet 231 for magnetic connection, fixing the position of the telescopic rotating rod 270 with magnetic force. Then, the locking rod 280 is rotated from the through groove 250 into the annular groove 240, where the locking rod 280 acts as a limiter, preventing the telescopic rotating rod 270 from moving axially. Then, the telescopic rotating rod 270 is pushed to shorten it, causing the limiting rod 271 on the telescopic rotating rod 270 to move into the limiting groove 262 on the limiting chamber 261, preventing the telescopic rotating rod from rotating. The main scraper 100 and the auxiliary scraper 220 are connected securely by rotating the telescopic rotating rod. When the auxiliary scraper 220 needs to be disassembled, the telescopic rotating rod is stretched to move the limiting rod on the telescopic rotating rod out of the limiting groove. Then the telescopic rotating rod is rotated to make the locking rod 280 rotate in the annular groove 240 to the through groove, releasing its limiting effect. Then the telescopic rotating rod 270 is pulled outward to overcome the magnetic force between the first adsorption magnet 231 and the second adsorption magnet 272, and the telescopic rotating rod 270 is pulled out of the positioning chamber 230, so that the locking rod 280 is disengaged from the positioning chamber 230. Finally, the connecting rod 210 is pulled out of the handle 200, and the main scraper 100 and the auxiliary scraper 220 can be separated.

[0034] In practical use, during the thickness adjustment stage, the construction personnel rotate the bidirectional screw 141 (operated via the outer hexagonal head or handle). Because the threads on both sides of the bidirectional screw are opposite in direction, it drives the two V-shaped locking blocks 150 to move in opposite or opposite directions along the screw axis. When the V-shaped locking blocks 150 move in opposite directions, the rubber damping pad 151 on their inner side separates from the slide rod 130, releasing the locking state of the slide rod 130. During the height adjustment stage, after the slide rod 130 is unlocked, the preload of the return spring 111 pushes the limiting plate 120 downwards, increasing the distance between the bottom surface of the limiting plate 120 and the bottom surface of the main scraper 100 (i.e., increasing the plaster thickness). The construction personnel can manually adjust the thickness according to the scale markings (which need to be set on the outside of the slide rod 130 or the mounting bracket 110). Pulling the connecting plate 131 upwards compresses the return spring 111, reducing the extension height of the limiting plate 120, thereby reducing the plaster thickness. During the locking and positioning stage, once the limiting plate 120 is adjusted to the target height, the bidirectional screw 141 is rotated in the opposite direction, driving the V-shaped locking blocks 150 to move towards each other. The rubber damping pad 151 gradually presses against the sliding rod 130, using friction to lock the sliding rod position. The high coefficient of friction and elastic deformation characteristics of the rubber material ensure reliable locking even under vibration, while avoiding damage to the sliding rod surface caused by rigid contact. During the working state maintenance stage, when plastering, the bottom surface of the limiting plate 120 contacts the wall surface, bearing the lateral pressure of the mortar and the friction of the scraper. The return spring 111 provides stable support through the limiting plate 120, allowing the main... The scraper 100 maintains a constant distance from the wall surface to achieve precise thickness control. A quick reset mechanism allows for easy adjustment of the plaster thickness. When the plaster thickness needs to be changed, repeating the above steps unlocks the slide bar 130, and the reset spring 111 automatically pushes the limit plate 120 to its maximum extension position (initial state), facilitating quick adjustment to other preset thickness levels. When connecting the main scraper 100 and the auxiliary scraper 220, first insert the connecting rod 210 into the handle 200. At this time, the positioning chamber 230 moves to the corresponding position, and simultaneously, the second adsorption magnet 272 at one end of the telescopic rotating rod 270 aligns with the first adsorption magnet 231 for magnetic connection. The position of the telescopic rotating rod 270 is fixed by magnetic force. Then, rotate the locking rod 280 from the through groove 250 to the annular groove 2. Within 40 degrees, the locking rod 280 acts as a limit within the annular groove 240, preventing the telescopic rotating rod 270 from moving axially. Then, pushing the telescopic rotating rod 270 shortens it, causing the limiting rod 271 on the telescopic rotating rod 270 to move into the limiting groove 262 on the limiting chamber 261, preventing the telescopic rotating rod from rotating. This achieves a stable connection between the main scraper 100 and the auxiliary scraper 220. When it is necessary to disassemble the auxiliary scraper 220, stretching the telescopic rotating rod causes the limiting rod on the telescopic rotating rod to move out of the limiting groove. Then, rotating the telescopic rotating rod causes the locking rod 280 to rotate within the annular groove 240 to the through groove, releasing its limiting effect. Finally, pulling the telescopic rotating rod 270 outward overcomes the magnetic force between the first adsorption magnet 231 and the second adsorption magnet 272.Pull the telescopic rotating rod 270 out of the positioning chamber 230, causing the locking rod 280 to disengage from the positioning chamber 230. Finally, pull the connecting rod 210 out of the handle 200 to separate the main scraper 100 from the auxiliary scraper 220.

[0035] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0036] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A scraper for controlling the thickness of plaster used on building walls, characterized in that: The system includes a main scraper (100) and a handle (200). The handle (200) is fixedly connected to the top of the main scraper (100). Two mounting brackets (110) are fixedly connected to the top of the main scraper (100). A return spring (111) is fixedly connected to the inner side of each mounting bracket (110), and the return springs (111) are arranged sequentially. A limit plate (120) is fixedly connected to the bottom end of each return spring (111), and a slide rod (130) is fixedly connected to the top of the limit plate (120). The top end of (130) passes through the mounting bracket (110) and extends to the top of the mounting bracket (110). A connecting plate (131) is fixedly connected between the top ends of the two sliding rods (130). Two mounting plates (140) are fixedly connected to the top of the mounting bracket (110). A bidirectional screw (141) is rotatably connected between the inner sides of the two mounting plates (140). One end of the bidirectional screw (141) passes through one side of the mounting plate (140) and extends to the outer side of the one side of the mounting plate (140).

2. The scraper for controlling the thickness of plastering building walls according to claim 1, characterized in that: Two V-shaped locking blocks (150) are screwed to the outer side of the bidirectional screw (141). A rubber damping pad (151) is bonded to the inner side of the V-shaped locking block (150), and the rubber damping pad (151) abuts against the slide rod (130).

3. A scraper for controlling the thickness of plastering building walls according to claim 1, characterized in that: One end of the handle (200) is connected to a connecting rod (210). One end of the connecting rod (210) is fixedly connected to a secondary scraper (220), and the outer side of the connecting rod (210) is fixedly connected to a positioning chamber (230).

4. A trowel for use in applying a coating to a building wall according to claim 3, wherein: The inner wall of the positioning chamber (230) is fixedly connected to a first adsorption magnet (231), the inner cavity of the positioning chamber (230) is provided with an annular groove (240), one side of the positioning chamber (230) is provided with a through groove (250), and the outer side of the handle (200) is fixedly connected to a fixing plate (260).

5. A trowel for use in applying a coating to a building wall, the trowel comprising a blade according to claim 4, wherein: A limiting chamber (261) is fixedly connected to one side of the fixed plate (260). Two limiting grooves (262) are opened on the outer side of the limiting chamber (261). A telescopic rotating rod (270) is rotatably connected to one side of the fixed plate (260). Two limiting rods (271) are fixedly connected to the outer side of the telescopic rotating rod (270). The limiting rods (271) are located inside the limiting grooves (262).

6. A trowel for use in applying a coating to a building wall, the trowel comprising a blade according to claim 5, wherein: One end of the telescopic rotating rod (270) passes through the fixed plate (260) and extends into the inner cavity of the positioning chamber (230), and a second adsorption magnet (272) is fixedly connected to one end of the telescopic rotating rod (270).

7. A trowel for use in applying a coating to a building wall, the trowel comprising a blade according to claim 6, wherein: The second adsorption magnet (272) is adsorbed and connected to the first adsorption magnet (231). Two locking rods (280) are fixedly connected to the outside of the telescopic rotating rod (270), and the locking rods (280) are located in the inner cavity of the annular groove (240).

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