Quick-release self-resetting taping gun

Abstract

The utility model relates to spray gun technical field, concretely relates to quick detach type self-resetting scraping ring mortar spray gun, include: spray gun body can spray paint, the discharge end of spray gun body is provided with the connecting port, nozzle assembly can be inserted into the connecting port and can atomize paint, thimble can be inserted into the spray gun body and one end of thimble extends into nozzle assembly, quick detach assembly is installed between nozzle assembly and connecting port for fixing nozzle assembly on the connecting port, the nozzle assembly includes nozzle body and the plug that can be inserted into the connecting port, hand wheel is rotatably arranged between nozzle body and plug, the center position of hand wheel is also fixed with nut. The utility model discloses through setting hand wheel can make thimble move, realize the adjustment of thimble, and through the effect of quick detach assembly makes nozzle assembly quick connection, and through the effect of scraping ring body to scrape the mortar in the cavity in nozzle assembly inside, avoids nozzle assembly blockage.

Description

Technical Field

[0001] This utility model relates to the field of spray gun technology, specifically a quick-release self-resetting scraper ring mortar spray gun. Background Technology

[0002] In the construction industry, plaster spray guns are key tools for achieving efficient and uniform plaster application, and are widely used for coating surfaces such as walls and ceilings. With the rapid development of the construction industry, higher demands are being placed on the performance and ease of use of plaster spray guns.

[0003] Current stucco paint spray guns suffer from significant technical defects: crude adjustment mechanisms and low cleaning efficiency. Traditional spray guns use a pull-out pin adjustment mechanism, requiring manual pulling of the pin to the desired position before tightening the bolt, resulting in low adjustment accuracy. Furthermore, high-viscosity stucco (5000-15000 cP) easily clogs the nozzles, requiring complete disassembly, soaking in chemical solvents, manual scrubbing, and reassembly—a process that takes an average of 25-35 minutes. Moreover, most existing spray guns use threaded connections. Threaded connections require multiple rotations during disassembly and reassembly, especially when frequent component replacements or site relocation are needed, significantly wasting time and labor costs. Utility Model Content

[0004] The purpose of this utility model is to provide a quick-release self-resetting scraper ring mortar spray gun. By setting a handwheel, the ejector pin can be moved to achieve the adjustment of the ejector pin. The quick-release component enables the nozzle assembly to be quickly connected. Furthermore, the scraper ring body scrapes away the mortar in the cavity inside the nozzle assembly, preventing the nozzle assembly from becoming clogged.

[0005] To address the problems of existing technologies, this utility model provides a quick-release self-resetting scraper ring plaster spray gun, characterized by comprising: a spray gun body capable of spraying paint, the discharge end of the spray gun body being provided with a connection port; a nozzle assembly capable of being inserted into the connection port and capable of atomizing the paint; a ejector pin capable of being inserted into the spray gun body, one end of the ejector pin extending into the nozzle assembly; a quick-release assembly installed between the nozzle assembly and the connection port for fixing the nozzle assembly to the connection port; the nozzle assembly includes a nozzle body and a plug capable of being inserted into the connection port, a handwheel rotatably disposed between the nozzle body and the plug, a nut fixed at the center of the handwheel, and a threaded engagement with the nut at the rear end of the ejector pin.

[0006] Preferably, the handwheel has several anti-slip stripes distributed around its edge, and the outside of the handwheel is also provided with a dial, which is divided into thirty-six sections, each corresponding to a 0.1mm opening adjustment.

[0007] Preferably, the ejector pin is further provided with an anti-wear coating with a thickness of 50 μm.

[0008] Preferably, the outer edge of the plug is provided with a limiting groove, and the junction of the limiting groove and the plug is set as an inclined surface. The quick-release assembly includes several holes provided on the connection port, and a retaining bead is movably provided in the hole. When the plug is inserted into the connection port, the retaining bead can be locked in the limiting groove.

[0009] Preferably, the connector also has a retaining ring inside, so that when the plug is inserted into the connector, the plug abuts against the retaining ring.

[0010] Preferably, a limiting ring is provided outside the connection port, and the quick-release assembly also includes a second return spring of the plug sleeved on the connection port and a sliding sleeve sleeved on the connection port. One end of the second return spring is connected to the limiting ring, and the other end of the second return spring is connected to the sliding sleeve. The sliding sleeve can press against the retaining bead.

[0011] Preferably, the nozzle assembly also has a scraper ring body slidably disposed inside the front end of the ejector pin, and a groove is provided on the inner side of the scraper ring body. The front end of the ejector pin is also provided with a slider, and a first return spring is also provided on the ejector pin, and the first return spring is connected in the nozzle assembly.

[0012] Preferably, the scraper ring body is made of PTFE material, and the scraper ring body is also embedded with several carbide cutting edges.

[0013] Preferably, the spray gun body is also provided with an air pipe interface at the handle, a detachable material cylinder at the top of the spray gun body, and an anti-vibration locking component that cooperates with and is adjustable at the tail end of the ejector pin.

[0014] The advantages of this utility model compared to the prior art are: Regarding the adjustment precision of the ejector pin, this application employs a threaded structure at the rear end of the ejector pin, which, together with an adapter nut inside the handwheel, forms a precision transmission pair. A graduated dial, evenly divided into thirty-six segments, is also mounted on the handwheel. Each rotation of the handwheel allows for a precise millimeter displacement of the ejector pin. The visual graduations on the dial, combined with the precision threaded transmission, significantly improve the adjustment precision of the ejector pin. This high-precision adjustment mechanism can accurately control the amount and pressure of mortar sprayed, adapting to the spraying requirements of mortars of varying consistency. It effectively ensures the uniformity of the spray thickness and reduces material waste and subsequent repair work caused by inaccurate flow control. Regarding the self-cleaning and anti-clogging function of the nozzle assembly, this application achieves automatic cleaning through the synergistic action of the scraper ring and the first return spring. When the nozzle assembly needs cleaning, clean water is introduced into it. The water pressure pushes the scraper ring along the inner wall of the nozzle assembly and compresses the first return spring. After the water supply stops, the elastic potential energy of the first return spring is released, driving the scraper ring to return to its original position. The reciprocating motion of the scraper ring thoroughly removes the sludge residue and dirt adhering to the inner wall of the nozzle assembly. This self-cleaning structure completes the cleaning operation without disassembling the nozzle assembly, which not only simplifies the maintenance process and shortens the cleaning time, but also effectively avoids nozzle clogging caused by the solidification of residues, ensuring the continuity and stability of the spraying operation and extending the service life of the nozzle assembly. Regarding the quick replacement of the nozzle assembly, this application achieves convenient disassembly and assembly of the nozzle assembly through a quick-release component. During disassembly, simply slide the sliding sleeve to separate it from the retaining ball, and the nozzle assembly can be directly pulled out from the connector. During installation, after inserting the plug on the nozzle assembly into the connector, the elastic force of the second return spring drives the sliding sleeve to return to its original position. The sliding sleeve pushes the retaining ball into the limiting groove of the plug until the sliding sleeve completely covers the retaining ball to form a lock. This quick-release structure allows for tool-free nozzle assembly replacement, significantly reducing the switching time between different nozzle models. It enables rapid adaptation to various spraying scenarios (such as different spray widths and atomization requirements), significantly improving construction flexibility and work efficiency while reducing operator workload. In summary, this application, through the synergistic design of high-precision adjustment, self-cleaning anti-clogging, and quick disassembly, comprehensively enhances the performance, maintenance convenience, and construction adaptability of plaster spray guns, effectively solving problems such as insufficient adjustment precision, easy clogging, and inconvenient replacement found in existing technologies. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the quick-release self-resetting scraper ring mortar spray gun of this utility model.

[0016] Figure 2 This is a cross-sectional structural diagram of the quick-release self-resetting scraper ring mortar spray gun of this utility model.

[0017] Figure 3 This is a schematic diagram of the first exploded structure of the quick-release self-resetting scraper ring mortar spray gun of this utility model.

[0018] Figure 4 This is a second exploded structural diagram of the quick-release self-resetting scraper ring mortar spray gun of this utility model.

[0019] Figure 5 This is the utility model Figure 2 Enlarged structural diagram at point A in the middle.

[0020] Figure 6 This is a schematic diagram of the handwheel structure of the quick-release self-resetting scraper ring mortar spray gun of this utility model.

[0021] The following are the labels in the diagram: 1. Spray gun body; 11. Air pipe interface; 12. Material cylinder; 13. Connection port; 14. Limiting ring; 15. Retaining ring; 2. Nozzle assembly; 21. Nozzle body; 22. Handwheel; 221. Nut; 23. Plug; 231. Limiting groove; 24. Scraper ring body; 25. First return spring; 3. Anti-vibration locking assembly; 4. Ejector pin; 5. Quick release assembly; 51. Sliding sleeve; 52. Clamping ball; 53. Second return spring. Detailed Implementation

[0022] To further understand the features, technical means, and specific objectives and functions achieved by this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments.

[0023] Reference Figures 1-6 As shown, this utility model provides a quick-release self-resetting scraper ring plaster spray gun, comprising: a spray gun body 1, capable of spraying paint, with a connection port 13 at the discharge end of the spray gun body 1; a nozzle assembly 2, capable of being inserted into the connection port 13 and capable of atomizing the paint; a ejector pin 4, capable of being inserted into the spray gun body 1, with one end of the ejector pin 4 extending into the nozzle assembly 2; and a quick-release assembly 5, installed between the nozzle assembly 2 and the connection port 13 to fix the nozzle assembly 2 onto the connection port 13. The nozzle assembly 2 includes a nozzle body 21 and a plug 23 capable of being inserted into the connection port 13. A handwheel 22 is rotatably disposed between the nozzle body 21 and the plug 23, and a nut 221 is fixed at the center of the handwheel 22. The rear end of the ejector pin 4 is provided with a thread that can cooperate with the nut 221. Several anti-slip stripes are distributed around the edge of the handwheel 22, and a scale is provided on the outside of the handwheel 22, with the scale divided into thirty-six divisions, each corresponding to a 0.1mm opening adjustment. The ejector pin 4 is also equipped with an anti-wear coating with a thickness of 50um. The adjusting handwheel 22 (diameter Φ50mm) integrates an M8×3mm trapezoidal thread. Every 360° rotation pushes the ejector pin 4 to move axially by 3mm. The surface of the handwheel 22 is covered with anti-slip rubber texture. The single-finger operation torque is ≤1.5N·m, and the adjustment time is shortened from 45 seconds to 10 seconds.

[0024] Paint is delivered to the connector 13 through the internal channel of the spray gun body 1, and then enters the nozzle body 21 through the plug 23 of the nozzle assembly 2. By rotating the handwheel 22, the precision transmission pair formed by the internal nut 221 and the rear thread of the ejector pin 4 drives the ejector pin 4 to move axially. The opening is precisely adjusted using the 36 divisions (each division corresponding to 0.1mm) on the dial of the handwheel 22, thereby controlling the flow and pressure of paint through the nozzle body 21. The wear-resistant coating on the surface of the ejector pin 4 ensures the stability and service life of long-term adjustment. When the nozzle assembly 2 needs to be replaced, it can be directly pulled out using the quick-release component 5. During installation, the plug 23 is inserted into the connector 13 for quick locking. The anti-slip design and low operating torque (≤1.5N・m) of the handwheel 22 make the adjustment process more convenient, reducing the traditional adjustment time from 45 seconds to 10 seconds. Combined with the atomization function of the nozzle assembly 2, efficient, precise, and uniform spraying of plaster paint is achieved, while also ensuring ease of maintenance and equipment durability.

[0025] The outer edge of the plug 23 is also provided with a limiting groove 231, and the junction of the limiting groove 231 and the plug 23 is set as an inclined surface. The quick-release assembly 5 includes several holes provided on the connection port 13, and a retaining ball 52 is movably disposed in the holes. When the plug 23 is inserted into the connection port 13, the retaining ball 52 can be locked in the limiting groove 231. The limiting groove 231 is provided on the outer edge of the plug 23 as a locking point for the retaining ball 52. The engagement with the retaining ball 52 achieves mechanical fixation between the nozzle assembly 2 and the connection port 13. The junction between the limiting groove 231 and the plug 23 is set as an inclined surface. When the plug 23 is inserted into the connection port 13, the retaining ball 52 can be temporarily pushed back by the guiding action of the inclined surface, so that the plug 23 can be smoothly inserted into place, improving the smoothness of installation. The connection port 13 is also provided with a retaining ring 15. When the plug 23 is inserted into the connection port 13, the plug 23 abuts against the retaining ring 15. A limiting ring 14 is also provided on the outside of the connection port 13. The quick-release assembly 5 also includes a second return spring 53 of the plug 23 sleeved on the connection port 13 and a sliding sleeve 51 sleeved on the connection port 13. One end of the second return spring 53 is connected to the limiting ring 14, and the other end of the second return spring 53 is connected to the sliding sleeve 51. The sliding sleeve 51 can press on the retaining bead 52. In the natural state, the elastic force of the second return spring 53 pushes the sliding sleeve 51 to press the retaining bead 52, so that the retaining bead 52 is locked in the limiting groove 231. When the sliding sleeve 51 is slid, the second return spring 53 is compressed and stores elastic potential energy. After the sliding sleeve 51 is released, the elastic potential energy is released and drives the sliding sleeve 51 to reset, realizing automatic locking.

[0026] The plug 23 is inserted into the connector 13 and abuts against the retaining ring 15. At this time, the limiting groove 231 is aligned with the hole of the connector 13. The second return spring 53 pushes the sliding sleeve 51 to move closer to the limiting ring 14. The inner wall of the sliding sleeve 51 squeezes the retaining bead 52, so that the retaining bead 52 is partially embedded in the limiting groove 231. At the same time, the sliding sleeve 51 covers the outer side of the retaining bead 52, forming a double lock to ensure that the plug 23 is firmly connected to the connector 13 and prevent it from falling off due to pressure fluctuations during spraying. When the nozzle assembly 2 needs to be disassembled, the sliding sleeve 51 is slid away from the limiting ring 14. The sliding sleeve 51 compresses the second return spring 53 and disengages from the retaining bead 52, and the retaining bead 52 loses its radial constraint. At this time, the nozzle assembly 2 is pulled outward. The inclined surface of the limiting groove 231 of the plug 23 squeezes the retaining bead 52, so that the retaining bead 52 moves outward toward the hole of the connector 13. The plug 23 can be pulled out smoothly, completing the disassembly. In order to prevent leakage, a sealing ring is also provided at the joint between the nozzle assembly 2 and the connector 13 for sealing.

[0027] The nozzle assembly 2 also includes a scraper ring 24 slidably mounted on the front end of the ejector pin 4, with a groove formed on the inner side of the scraper ring 24. A slider is also provided at the front end of the ejector pin 4, and a first return spring 25 is mounted on the ejector pin 4 and connected to the nozzle assembly 2. The scraper ring 24 is made of PTFE material and has several 55° carbide cutting edges embedded within it.

[0028] The scraper ring 24 is made of PTFE (polytetrafluoroethylene), which is wear-resistant, has a low coefficient of friction, and good chemical stability, making it suitable for the corrosive environment of plaster coatings. The groove on its inner side cooperates with the slider at the front end of the ejector pin 4 to form a sliding guide structure, ensuring that the scraper ring 24 can move stably along the axial direction of the ejector pin 4 without relative rotation. Several 55° carbide cutting edges embedded in the scraper ring 24 utilize the high hardness of carbide to efficiently scrape away solidified plaster and dirt adhering to the inner wall of the nozzle assembly 2, preventing rapid wear of the cutting edges and extending the service life of the scraper ring 24.

[0029] When cleaning the nozzle assembly 2 is required, clean water is introduced into it. The water pressure acts on the end face of the scraper ring 24, pushing it to move axially along the slider guide of the ejector pin 4, while simultaneously compressing the first return spring 25. During this process, the 55° carbide cutting edge on the scraper ring 24 closely adheres to the inner wall of the nozzle assembly 2, thoroughly scraping away the mortar residue, scale, and other contaminants adhering to the inner wall as the scraper ring 24 moves. After the water supply stops, the water pressure disappears, the first return spring 25 releases its elastic potential energy, driving the scraper ring 24 to move in the opposite direction along the ejector pin 4 to reset, and the carbide cutting edge performs a second scraping of the inner wall of the nozzle assembly 2. Through this reciprocating motion, contaminants on the inner wall of the nozzle assembly 2 can be thoroughly removed, preventing clogging caused by the solidification of mortar residue.

[0030] The spray gun body 1 also has an air pipe interface 11 at its handle. The air pipe interface 11 serves as an inlet channel for compressed air and can be connected to an external air source pipeline. Its core function is to provide stable pneumatic power to the inside of the spray gun. On the one hand, it drives the delivery and pressurization of the plaster paint inside the spray gun body 1, ensuring that the paint can be smoothly sprayed out from the nozzle assembly 2. On the other hand, it can enhance the atomization effect of the paint in conjunction with the nozzle structure, and through airflow disturbance, make the plaster form uniform mist particles, improving the smoothness and adhesion of the sprayed surface. The top of the spray gun body 1 is also equipped with a detachable material cylinder 12. The spray gun body 1 is also equipped with an adjustable anti-vibration locking assembly 3 that cooperates with the tail end of the ejector pin 4. The anti-vibration locking assembly 3 has anti-vibration buffering performance, which can absorb the vibration energy generated during the operation of the spray gun, reduce the impact of vibration on the transmission pair of ejector pin 4 and nut 221, and avoid the decrease in adjustment accuracy or loosening of parts due to vibration.

[0031] The above embodiments only illustrate one or more implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. A quick-release self-resetting scraper ring plaster spray gun, characterized in that, include: The spray gun body (1) is capable of spraying out paint, and the discharge end of the spray gun body (1) is provided with a connection port (13). The nozzle assembly (2) can be inserted into the connector (13) and can atomize the paint; The ejector pin (4) can be inserted into the spray gun body (1) and one end of the ejector pin (4) extends into the nozzle assembly (2); A quick-release assembly (5) is installed between the nozzle assembly (2) and the connector (13) to secure the nozzle assembly (2) to the connector (13); The nozzle assembly (2) includes a nozzle body (21) and a plug (23) that can be inserted into a connector (13). A handwheel (22) is rotatably provided between the nozzle body (21) and the plug (23). A nut (221) is fixed at the center of the handwheel (22). The rear end of the ejector pin (4) is provided with a thread that can cooperate with the nut (221).

2. The quick-release self-resetting scraper ring mortar spray gun according to claim 1, characterized in that, The handwheel (22) has several anti-slip stripes distributed around its edge. The handwheel (22) also has a dial on its outside, which is divided into thirty-six sections, each corresponding to a 0.1mm opening adjustment.

3. The quick-release self-resetting scraper ring mortar spray gun according to claim 2, characterized in that, The ejector pin (4) is also provided with an anti-wear coating with a thickness of 50 μm.

4. The quick-release self-resetting scraper ring mortar spray gun according to claim 1, characterized in that, The outer edge of the plug (23) is also provided with a limiting groove (231), and the junction of the limiting groove (231) and the plug (23) is set as an inclined surface. The quick-release assembly (5) includes several holes provided on the connection port (13), and a locking bead (52) is also movably provided in the hole. When the plug (23) is inserted into the connection port (13), the locking bead (52) can be locked in the limiting groove (231).

5. The quick-release self-resetting scraper ring mortar spray gun according to claim 4, characterized in that, The connector (13) is also equipped with a retaining ring (15). When the plug (23) is inserted into the connector (13), the plug (23) abuts against the retaining ring (15).

6. The quick-release self-resetting scraper ring mortar spray gun according to claim 4, characterized in that, The connection port (13) is also provided with a limiting ring (14) on the outside. The quick-release assembly (5) also includes a second return spring (53) of the plug (23) sleeved on the connection port (13) and a sliding sleeve (51) sleeved on the connection port (13). One end of the second return spring (53) is connected to the limiting ring (14), and the other end of the second return spring (53) is connected to the sliding sleeve (51). The sliding sleeve (51) can press on the retaining bead (52).

7. The quick-release self-resetting scraper ring mortar spray gun according to claim 1, characterized in that, The nozzle assembly (2) is also slidably disposed inside the front end of the ejector pin (4), and a sliding groove is provided on the inner side of the ejector pin (4). The front end of the ejector pin (4) is also provided with a slider, and the ejector pin (4) is also provided with a first return spring (25), and the first return spring (25) is connected in the nozzle assembly (2).

8. The quick-release self-resetting scraper ring mortar spray gun according to claim 7, characterized in that, The scraper ring (24) is made of PTFE material, and several 55° carbide cutting edges are embedded in the scraper ring (24).

9. The quick-release self-resetting scraper ring mortar spray gun according to claim 1, characterized in that, The spray gun body (1) is also provided with an air pipe interface (11) at the handle, and a detachable material cylinder (12) is also provided at the top of the spray gun body (1). The spray gun body (1) is also provided with an anti-vibration locking assembly (3) that cooperates with the tail end of the ejector pin (4) and is adjustable.

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