A dynamic sealing and clamping assembly for use in a spray gun

Abstract

This utility model relates to the field of spray gun technology and discloses a dynamic sealing and clamping assembly for spray guns, including a piano-shaped guide seat with several elastic bodies spaced apart on its inner wall; a clamping nut sleeved on the rear end of the piano-shaped guide seat; a clamping spring disposed inside the piano-shaped guide seat, with its two ends abutting against the inner top of the piano-shaped guide seat and the clamping nut respectively, thereby allowing the piano-shaped guide seat to reset; and a ejector pin inserted from the rear end of the clamping nut and passing through a first through hole, with the outer wall of the ejector pin fixedly connected to the first through hole. Compared with existing clamping components where there is sliding between the ejector pin and the clamping component, the structure of this utility model can effectively solve the problem of motion wear between the ejector pin and the clamping component; significantly reduce the frequency and cycle of component replacement, reducing replacement costs; and solve the problem of uneven pressure caused by different tightness during adjustment and different gaps when the ejector pin opens during the assembly process of the ejector pin and the clamping component.

Description

Technical Field

[0001] This utility model relates to the field of spray gun technology, and specifically to a dynamic sealing and clamping component used in spray guns. Background Technology

[0002] A sealing and clamping assembly is a mechanical component used to achieve a sealing effect and provide a fastening function. It is commonly used in equipment such as fluid transport systems, pressure vessels, and mechanical connections to prevent gas or liquid leakage. A spray gun is a tool that uses compressed air or high-pressure liquid to atomize paint, cleaning agents, or other liquids and spray them evenly onto the target surface. It is widely used in painting, cleaning, lubrication, disinfection, and other fields. In the context of the spraying industry, the problems and shortcomings of spray guns include: Damage to the shaft (nozzle assembly ejector pin) is a common issue. Traditional clamping structures use hard seals or plug seals, both employing linear movement of the ejector pin shaft within the clamp, with external pressure applied to maintain the seal. Prolonged friction can easily lead to seal failure, causing gas-liquid cross-contamination and liquid leakage. Maintenance requires complete removal of all external parts for replacement, resulting in high maintenance costs and low production efficiency. In fully automated operations, frequent clamp failures disrupt equipment stability, increase product defect rates, and negatively impact operations. Traditional sealing seals often use a single type of rubber material, which is prone to deformation and wear under long-term impact from high-pressure fluids, leading to seal failure. Their simple structural design makes it difficult to adapt to the sealing requirements of fluids with different viscosities. Replacement and maintenance are complex, requiring the disassembly of multiple parts, which affects work efficiency. Traditional spraying methods can easily lead to paint / media leakage. During spraying, high-pressure fluid (paint) splashes from the gaps in the spray gun, polluting the working environment and increasing material loss. Leaks of toxic paint may cause poisoning or skin burns to operators. Air ingress and poor sealing of coating defects can cause compressed air to seep into the paint channel, forming air bubbles and causing defects such as pinholes and orange peel in the paint film. Imbalance in the mixing ratio of two-component materials can lead to abnormal curing. Traditional forced mechanical impact leads to equipment wear and tear, rapid wear of core components, and shortened lifespan of parts such as nozzles and ejector pins due to lack of cushioning, which directly bear the recoil force of paint spraying; continuous impact of steel shot on the unbuffered gun body in shot blasting equipment may cause metal fatigue fracture; uncontrolled system vibration, with high-frequency vibration transmitted to the operator's arm, may cause occupational injuries such as white finger disease; and the connection between the spray gun and the feed pipe may become loose due to vibration, leading to spraying interruption or safety accidents. Traditional pressurization operations suffer from decreased stability and efficiency, uncontrolled pressure fluctuations, and a lack of flexible pressurization pressure regulation, resulting in uneven spray atomization and affecting the conformal coating effect on precision electronic components. Shot blasting equipment impact force fluctuations lead to uneven surface treatment, and manual intervention costs surge, requiring frequent shutdowns to manually tighten nozzles, replace seals (adding 15 minutes of maintenance time per hour), and repeatedly calibrate spraying parameters (such as output rate and atomization angle) due to loosening and drift. The technical problem to be solved by this utility model is to provide a dynamic sealing clamping component with less wear. Utility Model Content

[0003] The technical problem this invention addresses is: to provide a dynamic sealing clamping component with less wear; compared to existing clamping components where there is sliding between the ejector pin and the clamping component, the structure of this invention effectively solves the problem of motion wear between the ejector pin and the clamping component; it significantly reduces the frequency and cycle of component replacement, reducing replacement costs; and it solves the problem of uneven pressure caused by different gaps when the ejector pin opens due to different tightness during adjustment during the assembly process of the ejector pin and the clamping component.

[0004] A dynamic sealing and clamping assembly for a spray gun includes a piano-shaped guide seat with an opening at the bottom and a hollow interior; a first through hole formed at the top of the piano-shaped guide seat; and a plurality of gradually increasing elastic bodies formed at intervals on the inner wall of the piano-shaped guide seat, which can contract to achieve dynamic sealing; a clamping nut with a first threaded section formed on its exterior, which is threadedly connected to an external mounting component, thereby clamping and sealing the piano-shaped guide seat; a clamping spring located inside the piano-shaped guide seat, with its two ends abutting against the inner top of the piano-shaped guide seat and the clamping nut, respectively, thereby allowing the piano-shaped guide seat to reset; and a ejector pin inserted from the rear end of the clamping nut and exiting through the first through hole, with its outer wall fixedly connected to the first through hole, wherein when the ejector pin moves backward, the front end of the piano-shaped guide seat moves synchronously with the ejector pin.

[0005] Compared with the prior art, the beneficial effects of this utility model are: the clamping component of this utility model is made of a material that combines a spring, a metal part, and a rubber piano-shaped guide seat, which provides better cushioning than traditional materials, reduces friction, ensures the stability of the fluid during transportation, and improves the service life of the spray gun. Dynamic buffer: Absorbs high-frequency impacts during spraying or shot peening, reducing component wear; Pressure self-regulation: It maintains sealing through elastic tightening and adapts to pressure changes under different working conditions; Safety Locking: The spring-assisted self-locking mechanism prevents accidental displacement of the adjustment, improving operational safety; Compared to existing clamping components where there is sliding between the ejector pin and the clamping component, the structure of this utility model can effectively solve the problem of motion wear between the ejector pin and the clamping component; it can significantly reduce the frequency and cycle of component replacement and reduce replacement costs; and it can solve the problem of uneven pressure caused by different gaps when the ejector pin opens due to different tightness during adjustment during the assembly process of the ejector pin and the clamping component.

[0006] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0007] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0008] Figure 1 This is a schematic diagram of the clamping component and ejector pin installation structure of this utility model.

[0009] Figure 2 This is a schematic diagram of the clamping component structure of this utility model.

[0010] Figure 3 This is a utility model Figure 1 Another structural diagram from another angle.

[0011] Figure 4 This is a utility model Figure 1 A schematic diagram of the cross-sectional structure.

[0012] Figure 5 This is a utility model Figure 1 A schematic diagram of its decomposed structure.

[0013] In the diagram: 1. Piano-style guide seat; 2. Compression nut; 3. Compression spring; 4. First through hole; 5. Elastomer; 6. First protrusion; 7. Second protrusion; 8. Second through hole; 9. First threaded section; 13. Ejector pin. Detailed Implementation

[0014] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0015] It should be noted that the terms "first," "second," etc., used in this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this disclosure described herein can be implemented in orders other than those illustrated or described herein. The implementation methods described in the following exemplary embodiments do not represent all implementation methods consistent with this disclosure.

[0016] Please see Figures 1-5 In this embodiment of the present invention, a dynamic sealing and clamping component for a spray gun includes a piano-shaped guide seat 1, the bottom of which has an opening and is hollow inside; and the top of the piano-shaped guide seat 1 is formed with a first through hole 4; and the inner wall of the piano-shaped guide seat 1 is formed with a plurality of gradually increasing elastic bodies 5 at intervals, and the plurality of elastic bodies 5 can contract to achieve dynamic sealing. The tightening nut 2 has a first threaded section 9 formed on its outer surface. The first threaded section 9 is threadedly connected to the external mounting part, thereby tightening and sealing the piano guide seat with the tightening nut. The clamping spring 3 is located inside the piano-shaped guide seat 1, and the two ends of the clamping spring 3 abut against the inner top of the piano-shaped guide seat 1 and the clamping nut 2 respectively, so that the piano-shaped guide seat can be reset. The ejector pin 13 is inserted into and exits the first through hole from the rear end of the tightening nut, and the outer wall of the ejector pin is fixedly connected to the first through hole 4. When the ejector pin 13 moves backward, the front end of the piano-shaped guide seat 1 moves synchronously with the ejector pin 13.

[0017] Specifically, the dynamic sealing and clamping assembly used in this spray gun has an ingenious structure and a highly targeted functional design, which can effectively solve the problem of sealing failure caused by pressure fluctuations during the spraying process. Its core lies in the several elastic bodies 5 set inside the piano-shaped guide seat 1. These protrusions have elastic deformation capabilities. In addition, the top of the piano-shaped guide seat is provided with a first through hole 4 for the ejector pin 13 to pass through, so that the ejector pin can be fixedly connected to the through hole, thereby providing reliable axial support and guidance when the sealing assembly is working. The outer wall of the ejector pin 13 is fixedly connected to the first through hole 4. When the ejector pin 13 moves backward, it will drive a small section in front of the piano-shaped guide seat 1 to move backward. The inner wall of the piano-shaped guide seat 1 is formed with several elastic bodies 5 at intervals, so the section behind the piano-shaped guide seat 1 will also undergo a certain deformation, and even the small section of the piano-shaped guide seat 1 can retract into the large section. At the same time, the internal clamping spring 3 is also compressed. When the ejector pin 13 is released, the elastic force of the clamping spring 3 causes the piano-shaped guide seat 1 and the ejector pin 13 to reset and return to the initial position. Compared with the existing clamping parts, there is sliding between the ejector pin and the clamping part. The structure of this utility model can effectively solve the problem of wear between the ejector pin and the clamping part. It can significantly reduce the replacement frequency and cycle of parts and reduce replacement costs. It can solve the problem of uneven pressure caused by different tightness during the assembly process of the ejector pin and the clamping part, and different gaps when the ejector pin is opened.

[0018] The tightening nut 2 is sleeved with the rear end of the piano-shaped guide seat 1, forming the main sealing structure inside the spray gun and effectively preventing leakage of the spraying medium. The tightening spring 3, located inside the piano-shaped guide seat, further enhances the system's dynamic response capability. When high-pressure spraying is completed or the pressure drops, the spring quickly pushes the piano-shaped guide seat back to its initial position, ensuring rapid structural reset and preparation for the next spraying. This triple-collaborative design of "elastic buffer + mechanical reset + sealing protection" gives the component excellent sealing reliability, impact resistance, and durability in dynamic high-pressure spraying environments, making it suitable for industrial spray gun systems with high requirements for spraying consistency and sealing performance.

[0019] Furthermore, the outer shape of the piano-shaped guide seat 1 is pagoda-shaped; and the cross-section of the clamping spring 3 is also pagoda-shaped.

[0020] Specifically, the piano-shaped guide seat 1 has a pagoda shape, that is, a tapered structure that expands layer by layer from top to bottom. This structure can effectively disperse the axial and radial impact forces from the high pressure of spraying when under stress. Compared with the traditional straight cylindrical structure, the pagoda shape has better resistance to deformation, especially in the high-frequency, high-impact spraying environment, which can improve the structural stability of the piano-shaped guide seat 1 body and prevent deformation, cracking or sealing failure. In addition, the layered transition of the pagoda shape also provides a more stable limiting structure for the installation of the internal spring and the clamping nut 2, so that the components can be precisely aligned and reduce the performance degradation caused by misalignment or loosening.

[0021] Secondly, the cross-section of the clamping spring 3 is also pagoda-shaped, and its technical essence lies mainly in the gradual change in the diameter or pitch of the spring coil from top to bottom. This spring design brings non-linear elastic characteristics, providing more scientific buffer force feedback in the high-pressure pulse generated by the instantaneous spraying of the spray gun. The thinner upper part of the spring is highly responsive and can quickly initiate elastic deformation to absorb the initial impact; while the thicker lower part provides sufficient support rigidity to prevent excessive compression or yielding deformation under high pressure. This segmented spring buffering mechanism significantly enhances the spring's responsiveness and service life, and is especially suitable for high-frequency spraying conditions.

[0022] Furthermore, the top of the clamping nut 2 is formed with a first protrusion 6 facing upward; and the top of the first protrusion 6 is formed with a second protrusion 7 facing upward; and the inner wall of the piano guide seat 1 is sleeved and fixed with the first protrusion 6; and the second protrusion 7 gradually decreases in size from bottom to top; and the other end of the clamping spring 3 abuts against the top of the first protrusion 6.

[0023] Specifically, firstly, a first protrusion 6 is formed upwards on the top of the tightening nut 2. This protrusion structure can be regarded as a transitional connection component between the tightening nut 2 and the tightening spring 3. On the one hand, it enhances the structural strength of the top of the tightening nut 2, preventing deformation or tearing caused by local weakness under high-pressure spraying environment. On the other hand, it also provides a stable mounting platform for subsequent structures (such as the second protrusion 7 or the spring). A second protrusion 7 is formed upwards on the top of the first protrusion 6, forming a "stepped" double-layer protrusion structure. This graded extension design can more effectively transmit and disperse the instantaneous impact force generated during the spraying process.

[0024] The second protrusion 7 gradually decreases in size from bottom to top, forming a "conical" or "tapered" structure. This geometry not only allows the spring end to fit more naturally against its surface, improving contact stability and force uniformity, but also makes the spring's guidance during compression smoother, reducing the possibility of local stress concentration, thereby extending the service life of the spring and the clamping nut 2. In addition, the conical structure also has a certain self-positioning effect, which helps to quickly align during assembly, improving assembly efficiency and consistency.

[0025] Furthermore, the top of the tightening nut 2 is formed with a second through hole 8; the outside of the tightening nut 2 is formed with a first threaded section 9; and the bottom of the tightening nut 2 is formed with a bolt hole 11.

[0026] Specifically, firstly, a second through hole 8 is formed through the top of the tightening nut 2. This structure gives the tightening nut 2 good axial penetration capability. In some spraying systems, the second through hole 8 can serve as an insertion channel for the nozzle at the front end of the spray gun, or it can be used to work in conjunction with internal guide shafts, sensor probes, and other components to achieve precise positioning, media delivery, or process monitoring. The through hole can also reduce the pressure difference on the sealing surface, improve the pressure stability of the tightening nut 2, and avoid deformation or failure caused by pressure imbalance.

[0027] Secondly, in the structural design of this clamping component, the clamping nut 2 has a first threaded section 9 on its exterior. Through threaded fastening, the clamping nut 2 can be firmly installed inside the spray gun, ensuring stable positioning during high-pressure spraying and significantly improving the overall sealing and impact resistance of the device. Compared with traditional socket connections, threaded connections provide stronger vibration resistance, effectively resisting the instantaneous high pressure and mechanical vibration generated during spraying, preventing the clamping nut 2 from loosening, shifting, or leaking. Furthermore, the threaded structure facilitates disassembly and maintenance, making the replacement of the clamping nut 2 more convenient and quick. The threaded design also allows the clamping component to be adjusted forward and backward by rotation, thus better matching the position of the ejector pin. Combined with the second through hole 8 on the top of the clamping nut 2, the ejector pin can be adjusted forward and backward.

[0028] 1. Piano-style compression design Axial wear is reduced by incorporating a multi-stage elastomer and a follow-up structure on the ejector pin shaft. This structure can be made of corrosion-resistant materials; designed as a bellows cover, it moves axially with the ejector pin shaft to absorb axial friction and achieve non-destructive operation.

[0029] 2. The ejector pin clamping and buffering mechanism of the automatic spray gun The clamping assembly consists of a clamping nut, a clamping spring, and a piano-type guide. The elastic pressure of the spring buffers the instantaneous high-pressure impact of the paint during spraying, while the threaded adjustment allows for precise control of the ejector pin position. For example, the clamping spring forms a self-locking mechanism between the adjusting nut and the screw, ensuring stable clamping force while allowing for flexible adjustment during one-handed operation. 3. The spray gun features an integrated design for adjustment, locking, and buffer clamping. The cushioning performance of the clamping structure has been further optimized; a clamping spring is provided at the end, which applies elastic force through bolt hole 11 (hex socket set screw), making the contact between the ejector pin and the nozzle more uniform and reducing hard friction. At the same time, the adjusting nut and the clamping spring provide dual cushioning: firstly, to absorb the impact force during trigger operation, and secondly, to maintain adjustment stability through thread self-locking, preventing accidental loosening that could cause the spray gun to go out of control.

[0030] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. A dynamic sealing and clamping assembly for use in a spray gun, characterized in that, include: The piano-shaped guide seat (1) has an opening at the bottom and is hollow inside; and the top of the piano-shaped guide seat (1) is formed with a first through hole (4); and the inner wall of the piano-shaped guide seat (1) is formed with a number of gradually increasing elastic bodies (5), and the number of elastic bodies (5) can contract to achieve dynamic sealing. The tightening nut (2) has a first threaded section (9) formed on its outer surface. The first threaded section (9) is threadedly connected to the external mounting part, thereby tightening and sealing the piano guide seat with the tightening nut. A clamping spring (3) is located inside the piano-shaped guide seat (1), and the two ends of the clamping spring (3) abut against the inner top of the piano-shaped guide seat (1) and the clamping nut (2) respectively, so that the piano-shaped guide seat can be reset. The ejector pin (13) is inserted into and passes through the first through hole (4) from the rear end of the tightening nut, and the outer wall of the ejector pin is fixedly connected to the first through hole (4). When the ejector pin (13) moves backward, the front end of the piano-shaped guide seat (1) moves synchronously with the ejector pin (13).

2. The dynamic sealing and clamping assembly for a spray gun according to claim 1, characterized in that, The outer shape of the piano-style guide seat (1) is pagoda-shaped; and the cross-section of the clamping spring (3) is also pagoda-shaped.

3. The dynamic sealing and clamping assembly for a spray gun according to claim 1, characterized in that, The top of the tightening nut (2) is formed with a first protrusion (6); and the top of the first protrusion (6) is formed with a second protrusion (7); and the inner wall of the piano guide (1) is sleeved and fixed with the first protrusion (6); and the second protrusion (7) gradually decreases from bottom to top; the other end of the tightening spring (3) abuts against the top of the first protrusion (6).

4. The dynamic sealing and clamping assembly for a spray gun according to claim 1, characterized in that, The top of the tightening nut (2) is formed with a second through hole (8); and the bottom of the tightening nut (2) is formed with a bolt hole (11), which can adjust the position of the tightening nut (2).

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