An external wall putty coating device and a coating process thereof

Abstract

The present application relates to the technical fields of external wall putty coating, and solves the problem that the angle of the scraper and the coating roller cannot be adjusted according to the wall surface when the individual putty scraping device is used, so that the wall surface cannot be flatly attached, and uneven putty scraping phenomenon occurs. A kind of external wall putty coating device is disclosed, comprising a mounting base, the upper end of the mounting base is provided with a first coating part for leveling the wall surface, the rear end of the first coating part is provided with a second coating part for overall coating of the wall surface, a position control link member for recycling the first coating part is installed between the first coating part and the second coating part, the first coating part comprises a support frame slidingly installed on the mounting base, a coating head is symmetrically slidingly installed on the support frame, the coating head comprises a hopper and a material opening formed in the upper end of the hopper. The present application enhances the adhesion during putty scraping, and further enhances the uniformity of putty on the external wall.

Description

Technical Field

[0001] This invention relates to the field of exterior wall putty coating technology, specifically to an exterior wall putty coating device and its coating process. Background Technology

[0002] Applying putty refers to removing uneven parts of the base surface by filling or treating the entire surface, keeping the wall smooth and flat. It is the most important step in base surface treatment and is one of the methods of interior and exterior wall decoration. Putty is applied to the wall to ensure a smooth surface, and it is generally applied in three coats.

[0003] Currently, exterior wall puttying is generally done manually, which wastes time and increases the workload and cost for workers. Secondly, some existing puttying equipment cannot adjust the angle between the scraper and the brush roller according to the wall surface, making it impossible to apply the putty evenly and resulting in uneven putty application. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides an exterior wall putty coating device and its coating process. It solves the problem that some putty application devices cannot adjust the angle between the scraper and the brush roller according to the wall surface, resulting in uneven putty application and preventing a smooth, flush fit. This invention improves the adhesion of the putty during application, thereby enhancing the uniformity of the putty on the exterior wall.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution: an exterior wall putty coating device, comprising a mounting base, wherein a first coating component for leveling the wall surface is mounted on the upper end of the mounting base, a second coating component for overall wall coating is mounted on the rear end of the first coating component, and a control connection component for retrieving the first coating component and pushing the second coating component forward is installed between the first coating component and the second coating component;

[0008] The first coating component includes a support frame slidably mounted on a mounting base. Coating heads are slidably mounted on the support frame symmetrically on its upper and lower sides. Each coating head includes a hopper and a material inlet at the upper end of the hopper. A material conveying pipe is connected to the material inlet. A measuring plate is mounted at the front end of the hopper. Several spray heads are equidistantly mounted on the measuring plate. The spray heads are built into the measuring plate and extend into the hopper. The structure of the spray head on the measuring plate is flush with the structure of the measuring plate. Anti-clogging and unblocking ports are opened around the spray head. Several unblocking components are rotatably mounted extending from the structure of the spray head built into the measuring plate.

[0009] Preferably, the control connection includes a slide mounted on the upper end of the mounting base, and a drive frame for carrying the second coating component is slidably mounted on the slide. The drive frame includes left and right drive frames and front and rear drive frames. The second coating component is mounted on the left and right drive frames. The left and right drive frames are slidably connected inside the front and rear drive frames and are slidably mounted inside the slide. A rack and a spur gear meshing with the rack are installed inside the left and right drive frames. The lower end of the spur gear is connected to a helical gear through a straight rod.

[0010] Preferably, scraper plates are symmetrically installed on the front end of the measuring plate. The scraper plates protrude from the measuring plate and several laser ranging sensors are installed at equal intervals on the lower scraper plate. The upper and lower scraper plates have the same protrusion height on the measuring plate. The feeding pipe extends to the rear end and is bent to connect to the feeding rack installed on the right end of the mounting base.

[0011] Preferably, the second coating component includes a material head installed between two support frames. The material head is connected to an external putty cylinder via a material delivery pipe. A bending rod is installed at the rear end of the material head and connected to the left and right drive frames. A spray nozzle is opened at the front end of the material head, and a scraper for smoothing the putty is installed in a frame shape at the front end of the material head.

[0012] Preferably, the mounting base has a groove, a drive rod is installed in the groove, a support frame is connected to the free end of the drive rod, the drive rod meshes with a helical gear, the mounting base has a cavity, the cavity is filled with mortar or putty for leveling the exterior wall, a material conveying pipe connected to the hopper at the lower end extends downward and penetrates the mounting base for upward material supply, and the material supply frame is in communication with the cavity of the mounting base.

[0013] Preferably, the spray head consists of an inner chamber and an outer chamber fitted onto the inner chamber. The inner chamber extends through the hopper, and the material unloading component is installed in the outer chamber and extends into the inner chamber. The material unloading component and the outer chamber are circumferentially equidistant. The material unloading component includes a material unloading rod extending into the inner chamber. The front end of the material unloading rod is conical, and a groove is provided on the conical structure to increase the contact area with the mortar. A drive chamber is installed on the structure of the material unloading rod installed in the outer chamber. A drive motor is installed in the drive chamber by bolts and is coaxially connected to the material unloading rod.

[0014] Preferably, a swivel ring is sleeved on several of the material unloading rods. The swivel ring has a through groove with a width adapted to the diameter of the material unloading rod. Anti-clogging unloading ports are equidistantly opened on the inner chamber in a circumferential direction. A swivel sleeve is covered on the anti-clogging unloading port. The swivel sleeve is sleeved on the swivel ring and has a misaligned hole with a diameter adapted to the anti-clogging unloading port. The length of the through groove is not less than the center distance between the misaligned hole and the anti-clogging unloading port.

[0015] Preferably, a rack is installed on the inner wall of the gyratory ring at the lower end of the through groove, a gear meshes on the rack, and a drive motor is connected to the gear and installed on the outer surface of the inner compartment.

[0016] An exterior wall putty coating process includes the following steps:

[0017] Wall leveling: The flatness of the exterior wall is checked using the first coating and leveled by applying mortar.

[0018] Component switching: The first coated component is retracted and the second coated component is pushed forward using the control connector;

[0019] Wall coating: Apply the second coating to the exterior wall and use a scraper to smooth the putty layer.

[0020] (III) Beneficial Effects

[0021] Compared with the prior art, the present invention provides an exterior wall putty coating device and its coating process, which has the following beneficial effects:

[0022] 1. In the technical solution disclosed in this invention, a first coating component is used to perform leveling work on the pre-coated exterior wall. Specifically, a spray head installed flush with the measuring plate is used to spray mortar into the recessed areas of the wall for filling, and a scraper is used to compact the mortar, increasing the connection strength between the filler and the wall. On the other hand, the coating head installed on the support frame is adjusted up and down to meet the overall leveling work of the exterior wall and further enhance the uniformity of subsequent putty coating.

[0023] 2. The present invention utilizes a control connector to switch between the first coating component and the second coating component within the original structural range, thereby switching between two different operating modes and performing a linkage switching mode. While the second coating component moves forward, the first coating component is retracted. The switching mode does not expand outward and does not affect the operation of the first coating component and the second coating component, thereby enhancing the structural stability and smoothness of the present invention.

[0024] 3. The present invention features a tapered front end of a material feeding rod with grooves on the tapered structure. This increases the contact area with the mortar and the contact with solids in the mortar. The rotation of the tapered structure itself affects the position of the solids in the mortar, thereby changing the pushing and squeezing of the solids in the inner chamber and further reducing the probability of blockage.

[0025] 4. In the technical solution disclosed in this invention, the rotation of the feeding rod is limited by using a directional ring. Specifically, a directional ring is sleeved on the feeding rod, and a through groove with a width adapted to the diameter of the feeding rod is opened on the directional ring. Thus, when the feeding rod is driven by the drive motor in the drive chamber, the directional ring limits the position of the rotation of the feeding rod to prevent it from being misaligned in the vertical direction. Attached Figure Description

[0026] Figure 1 This is an isometric view of the rear end of the overall structure of an exterior wall putty coating device according to the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of the first coating component of an exterior wall putty coating device according to the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of the second coating component of an exterior wall putty coating device according to the present invention;

[0029] Figure 4 This is a schematic diagram of the drive frame structure of an exterior wall putty coating device according to the present invention;

[0030] Figure 5 This is a schematic diagram of the control and connection component structure of an exterior wall putty coating device according to the present invention;

[0031] Figure 6 This is a schematic diagram of the first coating component of an exterior wall putty coating device according to the present invention;

[0032] Figure 7 This is a flow chart of an exterior wall putty coating process according to the present invention;

[0033] Figure 8 This is a schematic diagram of the material feeding component structure according to the second embodiment of the present invention.

[0034] In the diagram: 1. Mounting base; 2. First coating component; 21. Support frame; 22. Coating head; 23. Feed pipe; 24. Measuring plate; 25. Spray head; 251. Inner chamber; 252. Outer chamber; 26. Anti-clogging and unblocking port; 27. Unblocking component; 271. Unblocking rod; 272. Drive chamber; 28. Scraper; 29. ​​Feeding rack; 3. Second coating component; 31. Material head; 32. Bending rod; 33. Scraper; 4. Positioning connector; 41. Slide; 42. Drive frame; 43. Left and right drive frames; 44. Front and rear drive frames. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Example 1:

[0037] like Figure 1-7 As shown, an exterior wall putty coating device includes a mounting base 1, a first coating component 2 for leveling the wall surface is mounted on the upper end of the mounting base 1, a second coating component 3 for overall wall coating is mounted on the rear end of the first coating component 2, and a control connector 4 for retrieving the first coating component 2 and pushing the second coating component 3 forward is installed between the first coating component 2 and the second coating component 3.

[0038] In this embodiment, the first coating component 2 includes two support frames 21 symmetrically slidably mounted on the mounting base 1. Slide grooves are formed on the opposite end faces of the two support frames 21, and screws are installed within the slide grooves. Two coating heads 22 are symmetrically slidably mounted on the support frames 21 to level the exterior wall. A threaded groove with oppositely oriented upper and lower threads is formed at the position where the screws mate with the two coating heads 22. Each coating head 22 includes a hopper, and sliders for mate with the slide grooves are installed at both the front and rear ends of the hopper. The sliders have protruding internal threads that mate with the threaded grooves. A drive motor is connected to the screw inside the slide groove, and the drive motor is mounted on the inner wall of the slide groove. First, when leveling the exterior wall, the controller controls the drive motor connected to the screw, thereby causing the two coating heads 22 to move in opposite directions. In this specific embodiment, both the sliders and the slide grooves are T-shaped. A material inlet is located at the top of the silo, and a conveying pipe 23 is connected to the inlet to feed the silo. Simultaneously, two coating heads 22 are indirectly controlled by a drive motor to move in opposite directions, while mortar is filled into the silo along the conveying pipe 23. A measuring plate 24 is installed at the front end of the silo, and several spray heads 25 are evenly spaced on the measuring plate 24. A one-way valve is installed inside each spray head 25 to control the spraying of the mortar. The spray heads 25 are built into the measuring plate 24 and extend into the silo. In actual use, the spray heads 25 installed on the measuring plate 24 are used to spray the pre-leveled wall, thereby filling in any pits or defects.

[0039] In this embodiment, the structure of the nozzle 25 on the measuring plate 24 is flush with the structure of the measuring plate 24. An anti-clogging and unblocking port 26 is provided around the nozzle 25 to enhance the ease of maintenance of the nozzle 25. The anti-clogging and unblocking ports 26 are equidistantly spaced around the inner chamber 251, and a rotating sleeve is provided over the anti-clogging and unblocking ports 26. The rotating sleeve is fitted onto the rotating ring and has misaligned holes with a diameter adapted to the anti-clogging and unblocking ports 26.

[0040] A swivel sleeve is installed over the anti-clogging and unblocking opening 26. This prevents mortar from overflowing from the anti-clogging and unblocking opening 26 and causing the spray head 25 to lose its function after the mortar is filled into the hopper and flows towards the spray head 25. In this case, the swivel sleeve acts to block the anti-clogging and unblocking opening 26. If the spray head 25 becomes clogged and the output decreases, the controller drives the swivel sleeve to rotate, aligning the misaligned hole with the anti-clogging and unblocking opening 26. An external tool is then used to extend from the anti-clogging and unblocking opening 26 into the spray head 25 to achieve the purpose of unblocking.

[0041] A scraper plate 28 is symmetrically mounted on the front end of the measuring plate 24. The scraper plate 28 protrudes from the measuring plate 24, and several laser rangefinders are equidistantly mounted on it. Specifically, the upper scraper plate 28 of the coating head 22, which moves upwards, has a laser rangefinder sensor mounted on it, while the lower scraper plate 28 of the coating head 22, which moves downwards, has a laser rangefinder sensor mounted on it. The different mounting positions of the sensors on the two coating heads 22, in conjunction with their different movement paths, allow the coating head 25 to be controlled by the controller to delay material discharge after the wall surface is detected, ensuring it coincides with the detection area of ​​the laser rangefinders. The upper and lower scraper plates 28 protrude at equal heights from the measuring plate 24, thus allowing for smoothing after the coating head 25 has finished spraying the wall. The conveying pipe 23 extends to the rear end and is bent to be connected to the feeding rack 29 installed at the right end of the mounting base 1. The height of the conveying pipe 23 on the feeding rack 29 is greater than the height of the conveying pipe 23 connected to the original material hopper.

[0042] The overall length of the conveying pipe 23 is greater than the maximum distance between the feeding rack 29 and the hopper. This extended length increases the stability of the connection between the hopper and the feeding rack 29 while the hopper slides on the support frame 21. Based on the previous description of the first coating component 2, in practical use, the first coating component 2 is first adjusted to its initial state. In this specific embodiment, the initial state is as follows: two symmetrical coating heads 22 are in contact and located at the front end of the second coating head 22. The laser rangefinder on the scraper 28 detects the flatness of the exterior wall during movement. When a single area's detection value exceeds the average, a signal is sent to the controller. The controller then controls the spray heads 25 to spray several spray heads 25 within the pre-spraying area after a preset time, thereby achieving leveling. Meanwhile, the scraper 28 side without the laser rangefinder immediately scrapes the sprayed mortar flat during movement. The equal height setting of the two scraper 28s effectively removes excess mortar, significantly improving the leveling effect of the exterior wall.

[0043] The nozzle 25 consists of an inner chamber 251 and an outer chamber 252 fitted onto the inner chamber 251. The inner chamber 251 extends through the material hopper. The material unloading component 27 is installed on the outer chamber 252 and extends into the inner chamber 251. The material unloading component 27 is circumferentially and equidistantly installed on the outer chamber 252. The material unloading component 27 includes a material unloading rod 271 extending into the inner chamber 251. The material unloading rod 271 is mounted on the structure of the outer chamber 252 and a drive chamber 272 is installed thereon. A drive motor is installed in the drive chamber 272 by bolts and is coaxially connected to the material unloading rod 271.

[0044] The nozzle 25 is built into the structure of the measuring plate 24, and a number of material feeding components 27 are rotatably mounted thereon. A number of material feeding rods 271 are fitted with a directional ring. The directional ring has a through groove with a width adapted to the diameter of the material feeding rod 271. The length of the through groove is not less than the center distance between the misalignment hole and the anti-blockage opening 26. The directional ring has a through groove with a width adapted to the diameter of the material feeding rod 271. Thus, when the material feeding rod 271 is driven by the drive motor in the drive chamber 272, the material feeding rod 271 rotates. The directional ring limits the position of the rotation of the material feeding rod 271 to prevent it from being misaligned in the vertical direction. A rack is installed on the inner wall of the directional ring at the lower end of the through groove. A gear meshes on the rack. The gear is connected to the drive motor installed on the outer surface of the inner chamber 251.

[0045] The control connector 4 includes a slide 41 mounted on the upper end of the mounting base, on which a drive frame 42 for carrying the second coating component 3 is slidably mounted. The drive frame 42 includes left and right drive frames 43 and front and rear drive frames 44. The second coating component 3 is mounted on the left and right drive frames 43, and the left and right drive frames 43 are slidably connected inside the front and rear drive frames 44, which are slidably mounted inside the slide 41. A rack and a spur gear meshing with the rack are installed inside the left and right drive frames 43. The lower end of the spur gear is connected to a helical gear through a straight rod. A geared motor is bolted inside the left and right drive frames 43.

[0046] The geared motor and the helical gear are coaxially mounted. A groove is provided on the mounting base 1, and a drive rod is installed within the groove. A protrusion is fitted onto the drive rod, connecting it to the lower end of the support frame 21. In this embodiment, the drive rod is specifically a worm gear. The meshing conditions of the helical gear and worm gear are specifically described in this embodiment: firstly, the normal module and normal pressure angle of the worm gear and the helical gear must be equal; secondly, the lead angle of the worm gear must be equal to the helix angle of the helical gear; and finally, the helix direction of the worm gear must be the same as that of the helical gear. A cavity is provided inside the mounting base 1, filled with mortar or putty for leveling the exterior wall.

[0047] The mounting base 1 has an air inlet connected to an external air compressor to transport mortar or putty from the cavity into the conveying pipe 23 and spray it out from the nozzle 25. The conveying pipe 23, connected to the hopper at the lower end, extends downward and penetrates the mounting base 1 for upward material supply. The feeding rack 29 is in communication with the cavity of the mounting base 1. After the raw materials are filled into the mounting base 1, a high-pressure state is created within the mounting base 1 through the connection of the air inlet and the air compressor. With the nozzle 25 closed, material is pumped into the feeding rack 29 and the connected conveying pipe 23. The material is discharged when the nozzle 25 is opened.

[0048] The second coating component 3 includes a material head 31 installed between two support frames 21. The material head 31 is equipped with several nozzles, specifically DCF-S single-fluid solenoid valve nozzles. The width of the material head 31 is no greater than the distance between the two support frames 21. The material head 31 is connected to an external putty cylinder via a material delivery pipe 23. A bending rod 32 is installed at the rear end of the material head 31 and connected to the left and right drive frames 43. A spray nozzle is opened at the front end of the material head 31, and a scraper 33 for smoothing the putty is installed in a frame shape at the front end of the material head 31. After the second coating component 3 is driven by the control connector 4, initially, when the drive rod rotates forward, the helical gear remains stationary. At this time, the drive rod acts as a transmission rod for the helical gear, transmitting its forward movement. The control connector 4 and the second coating component 3 move forward as a whole. Simultaneously, the first coating component 2 moves backward, and the second coating component 3 gradually replaces the position of the first coating component 2, facing the exterior wall. When the second coating part 3 is completely flush with the first coating part 2, the helical gear rotates after the controller drives the reduction motor. Gradually, the second coating part 3 is completely misaligned with the first coating part 2 and gradually moves back and forth. The material head 31 moves left and right synchronously with the left and right gears based on the meshing of the gear wheel and teeth, thereby completing the exterior wall coating operation in a certain area.

[0049] An exterior wall putty coating process includes the following steps: using a first coating component 2 to detect the flatness of the exterior wall and leveling it by applying mortar; using a control connector 4 to retract the first coating component 2 and push the second coating component 3 forward; using the second coating component 3 to coat the exterior wall and using a scraper 33 to smooth the putty layer.

[0050] Example 2:

[0051] like Figure 8 As shown, based on Embodiment 1, the front end of the material unloading rod 271 extending into the inner chamber is set into a cone shape. The cone-shaped structure has grooves, which increases the contact area with the mortar on the one hand, and increases the contact with the solids in the mortar on the other hand. Thus, the position of the solids in the mortar is affected by the rotation of the cone-shaped structure itself, thereby changing the pushing of the solids in the inner chamber 251 and further reducing the probability of blockage.

[0052] The electrical components described in this article are controlled automatically by a controller. The controller circuit can be easily programmed by those skilled in the art. The power supply is also common knowledge in the field. Furthermore, since this invention is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail here.

[0053] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0054] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An external wall putty application device comprising a mounting base (1), characterised in that: The first coating part (2) is installed on the upper end of the mounting base (1) and used for leveling the wall surface, the second coating part (3) is installed on the rear end of the first coating part (2) and used for overall coating of the wall surface, and the position control connecting part (4) is installed between the first coating part (2) and the second coating part (3) and used for recovering the first coating part (2) and pushing the second coating part (3) forward; The first coating part (2) comprises the support frame (21) slidably installed on the mounting base (1), the coating head (22) symmetrically slidably installed on the support frame (21), the material bin and the material opening formed on the upper end of the material bin, the material conveying pipe (23) communicated with the material opening, the distance measuring plate (24) installed on the front end of the material bin, the plurality of material spraying heads (25) equidistantly installed on the distance measuring plate (24), the material spraying heads (25) built-in the distance measuring plate (24) and extended to the material bin, the structure of the material spraying heads (25) on the distance measuring plate (24) flush with the structure of the distance measuring plate (24), the anti-blocking dredging opening (26) formed around the material spraying heads (25), and the plurality of material dredging parts (27) rotatably installed in the structure of the distance measuring plate (24) extended to the material bin; The position control connecting part (4) comprises the sliding frame (41) installed on the upper end of the mounting base (1), the driving frame (42) slidably installed on the sliding frame (41) and used for carrying the second coating part (3), the left-right driving frame (43) and the front-rear driving frame (44) of the driving frame (42), the second coating part (3) installed on the left-right driving frame (43), the left-right driving frame (43) slidably connected in the front-rear driving frame (44), the front-rear driving frame (44) slidably installed in the sliding frame (41), the rack installed in the left-right driving frame (43), and the straight gear engaged with the rack, and the bevel gear connected with the straight gear through the straight rod at the lower end of the straight gear; The distance measuring plate (24) is symmetrically installed on the front end of the distance measuring plate (24), the material scraping plate (28) is protruded on the distance measuring plate (24) and equidistantly installed on the material scraping plate (28), the two material scraping plates (28) are protruded on the distance measuring plate (24) with equal height, the material conveying pipe (23) is extended to the rear end and installed on the feeding frame (29) at the right end of the mounting base (1) in a bent shape; The second coating part (3) comprises the material head (31) installed between the two support frames (21), the material cylinder filled with putty and connected with the outside through the material conveying pipe (23), the bent rod (32) installed on the rear end of the material head (31) and connected with the left-right driving frame (43), the material spraying opening formed on the front end of the material head (31), and the scraping plate (33) installed on the front end frame of the material head (31) and used for scraping the putty. The installation base (1) is provided with a sliding groove, a driving rod is installed in the sliding groove, the free end of the driving rod is connected with a support frame (21), the driving rod is engaged with a bevel gear, a cavity is formed in the installation base (1), mortar or putty used for wall leveling is filled in the cavity, and a feeding pipe (23) connected to a bin at the lower end extends downward and penetrates into the installation base (1) for upward feeding, and a feeding frame (29) is in communication with the cavity of the installation base (1).

2. The device according to claim 1, wherein: The material spraying head (25) is composed of an inner bin (251) and an outer bin (252) sleeved on the inner bin (251), the inner bin (251) penetrates into the bin, the material loosening piece (27) is installed on the outer bin (252) and extends into the inner bin (251), the material loosening piece (27) is installed on the outer bin (252) at equal intervals in a ring shape, wherein the material loosening piece (27) comprises a material loosening rod (271) extending into the inner bin (251), the front end of the material loosening rod (271) is in a conical shape, a slot is formed in the conical front end to increase the contact area with the mortar, and a driving bin (272) is installed on the structure of the outer bin (252), a driving motor is installed in the driving bin (272) through bolts and is coaxially connected with the material loosening rod (271).

3. An external wall plaster application apparatus according to claim 2, wherein: A rotation ring is sleeved on the material loosening rod (271), a through groove with a width adapted to the diameter of the material loosening rod (271) is formed in the rotation ring, the anti-blocking and dredging opening (26) is formed on the inner bin (251) at equal intervals in a ring shape, a rotation sleeve is arranged on the anti-blocking and dredging opening (26), the rotation sleeve is sleeved on the rotation ring and is provided with a misaligned hole with a diameter adapted to the anti-blocking and dredging opening (26), and the length of the through groove is not less than the center distance between the misaligned hole and the anti-blocking and dredging opening (26).

4. A device for applying render to an external wall according to claim 3, wherein: A rack is installed on the inner wall of the rotation ring at the lower end of the through groove, a gear engaged with the rack is arranged on the outer surface of the inner bin (251), and a driving motor is installed on the gear.

5. An external wall putty coating process using the external wall putty coating apparatus according to any one of claims 1 to 4, characterized by The operation steps include the following steps: S1, wall leveling: the first coating piece (2) is used to detect the flatness of the outer wall and to level the mortar coating; S2, component switching: the first coating piece (2) is retracted and the second coating piece (3) is pushed forward by using the control position connecting piece (4); S3, wall coating: the second coating piece (3) is used for coating the outer wall, and the putty layer is scraped flat by using the scraper (33).

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