Anti-overflow fluid automatic smearing gun

Abstract

The utility model discloses an anti-overflow fluid automatic smearing gun which comprises a power assembly, a coating gun body assembly and a gun nozzle connecting sleeve assembly. The coating gun body assembly comprises a gun body main body, a driving shaft and a sealing structure; a mounting cavity is formed in the main body, and a first connecting section, a sealing section, a coating supply section and a second connecting section are sequentially formed in the mounting cavity; a coating overflowing channel and a feeding hole are formed in the coating section; the driving shaft penetrates through the mounting cavity, and a first abutting end is formed at the end part of the driving shaft; the gun nozzle connecting sleeve assembly comprises a gun nozzle connector and a sealing bush, and the sealing bush forms a second abutting end. An overflowing gap is formed between the first abutting end and the second abutting end. The power assembly is connected with the driving end of the driving shaft; the driving shaft is driven by the power assembly to translate in the mounting cavity, so that the first abutting end is close to or far away from the second abutting end, and the overflowing gap is cut off or opened. The sealing device has the advantages of being convenient to operate and use, good in sealing effect and capable of effectively preventing fluid materials from overflowing.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid sealing in the industrial manufacturing industry, in particular to an automatic fluid coating gun that prevents overflow. Background Art

[0002] Fluid coating sealing is an important process in the manufacturing process of automobiles, aerospace and shipbuilding industries. At present, in order to achieve a sealing effect at the joints of plate-like structures, in addition to using fasteners for connection and fixation or overlapping and pressing, it is also necessary to use fluids of different viscosities and strengths that meet the sealing requirements to seal between the plates to ensure a tight connection between the structural fixtures. Existing gluing methods use manual application or pneumatic control to drive the gun body to apply glue according to the work requirements. However, whether it is manual operation or robot-driven operation, it is often easy for fluid materials to overflow, affecting the working environment and the quality of material application. In the past, when fluid materials overflowed, it was troublesome to check the gun body structure or replace parts, which indirectly affected the production schedule. Utility Model Content

[0003] In order to overcome the deficiencies of the prior art, the utility model provides an anti-overflow fluid automatic coating gun, which has the characteristics of being easy to operate and use, having a good sealing effect, and being able to effectively prevent the fluid material from overflowing.

[0004] The utility model provides an anti-overflow fluid automatic coating gun, comprising a power assembly, a coating gun body assembly and a gun nozzle connecting sleeve assembly;

[0005] The paint gun body assembly includes a gun body, a drive shaft and a sealing structure; the two ends of the gun body respectively form a first end and a second end, and a mounting cavity is formed inside the gun body, and the mounting cavity communicates with the first end and the second end; the mounting cavity is sequentially formed with a first connecting section, a sealing section, a paint supply section and a second connecting section from the first end to the second end; a paint flow channel is formed in the paint section, and a material feed hole is opened on the paint section; the drive shaft is arranged in the mounting cavity, and the two ends of the drive shaft respectively form a driving end and a first abutting end;

[0006] The gun nozzle connecting sleeve assembly includes a gun nozzle connecting head and a sealing bushing; the gun nozzle connecting head is installed on the second connecting section, and a spraying channel is formed inside the gun nozzle connecting head; the sealing bushing is arranged at one end of the spraying channel close to the gun body, and a passing channel is formed inside the sealing bushing, and a second abutting end and a discharging end are formed at both ends of the passing channel respectively, the discharging end is connected to the spraying channel, and the second abutting end is arranged close to the gun body; a flow gap is formed between the first abutting end and the second abutting end;

[0007] The power assembly is installed on the first connecting section, and the power assembly is connected to the driving end of the driving shaft; the power assembly provides power to drive the driving shaft to translate in the installation cavity, so that the first abutting end approaches or moves away from the second abutting end, cutting off or opening the flow gap.

[0008] As a preferred embodiment, a linear contact is formed between the first abutting end and the second abutting end;

[0009] The first abutting end is a conical surface in the circumference; the inner wall edge of the second abutting end is an outer annular curved surface; the conical surface and the outer annular curved surface are coaxially arranged, and when the first abutting end approaches the second abutting end, an annular line contact is formed between the conical surface and the outer annular curved surface.

[0010] As a preferred embodiment, the gun nozzle connector is provided with an annular groove in the circumference, and a first sealing ring is embedded in the annular groove, and the first sealing ring is an O-ring; a threaded section is formed in the circumference of the gun nozzle connector, and the gun nozzle connector is installed on the gun body by screwing the threaded section and the second connecting section; the gun nozzle connecting sleeve assembly also includes a locking nut, and the locking nut is screwed to the threaded section.

[0011] As a preferred embodiment, a countersunk hole is formed at one end of the spray channel of the nozzle connector close to the gun body; the sealing bushing is interference fit in the countersunk hole at the end of the spray channel; and a plurality of spray steps are formed in the spray channel.

[0012] As a preferred embodiment, a static seal is formed between the sealing structure and the inner wall of the installation cavity, and a dynamic seal is formed between the sealing structure and the drive shaft.

[0013] As a preferred embodiment, a sealing member installation groove is provided on the inner wall of the sealing section of the gun body;

[0014] The sealing structure includes a drive sleeve, a sealing ring assembly and a sealing ring supporting ring; the sealing ring assembly includes a plurality of second sealing rings, the cross-section of the second sealing ring is V-shaped, the V-shaped opening of the second sealing ring is arranged in the direction of the paint flow channel, and the tip is arranged in the direction of the first connecting section; the connection surface between the sealing ring supporting ring and the sealing ring assembly forms a protrusion that is adapted to the V-shaped opening, and the connection surface between the drive sleeve and the sealing ring assembly forms a groove that is adapted to the V-shaped tip; the sealing ring assembly is clamped and fixed in the seal mounting groove by the sealing ring supporting ring and the drive sleeve, so that the V-shaped opening, outer ring and V-shaped tip of the second sealing ring form sealing surfaces with the sealing ring supporting ring, the gun body and the drive sleeve respectively; the inner ring of the second sealing ring forms a sealing surface with the drive shaft.

[0015] As a preferred embodiment, the gun body is radially provided with a limiting hole; the limiting hole is arranged at one end of the sealing element installation groove close to the first connecting section; a limiting screw is screwed into the limiting hole, and the end of the limiting screw abuts against the end surface of the driving shaft sleeve to limit the sealing structure in the sealing element installation groove;

[0016] The gun body is radially provided with a through groove; the through groove is communicated with the sealing element installation groove, and the through groove can allow the driving shaft sleeve, the sealing ring assembly or the sealing ring supporting ring to pass through; the through groove is used for loading the driving shaft sleeve, the sealing ring assembly or the sealing ring supporting ring into the sealing element installation groove.

[0017] As a preferred embodiment, the power assembly comprises a cylinder cover and a cylinder piston; the cylinder cover is screwed at the first end of the gun body, a sealing washer is arranged at the joint of the cylinder cover and the gun body, and a cylinder cavity is formed between the cylinder cover and the first connecting section; the cylinder piston is movably connected in the cylinder cavity, and the cylinder piston is connected with the driving end of the driving shaft.

[0018] As a preferred embodiment, the cylinder cover has an end plate, a connecting lock hole is arranged at the center of the end plate of the cylinder cover, one end of the connecting lock hole is communicated with the top of the cylinder cavity, and a gas pipe joint is arranged at the other end of the connecting lock hole; the gas pipe joint is connected with a first gas source device.

[0019] An air guide hole is axially arranged at the inner end surface of the first connecting section of the gun body; a gas conveying hole is radially arranged in the first connecting section of the gun body; one end of the air guide hole is communicated with the bottom of the cylinder cavity, the other end of the air guide hole is communicated with the gas conveying hole, and the other end of the gas conveying hole is connected with a second gas source device.

[0020] As a preferred embodiment, the cylinder piston comprises a piston part and a connecting part; the piston part is in the shape of a circular truncated cone, an annular groove is arranged in the circumferential direction of the piston part, a third sealing ring is embedded in the annular groove of the piston part, the connecting part is coaxially arranged with the piston part in the shape of a circular cylinder, an annular groove is arranged in the circumferential direction of the piston part, and a fourth sealing ring is embedded in the annular groove of the piston part; the third sealing ring and the fourth sealing ring are both O-shaped sealing rings.

[0021] A counterbore is arranged at one end of the cylinder piston close to the cylinder cover, and a connecting hole is arranged at one end of the cylinder piston close to the driving shaft; the connecting hole is in interference fit with the driving end of the driving shaft; the driving shaft and the cylinder piston are screwed and fixed by a fastening bolt.

[0022] Compared with the prior art, the utility model has the beneficial effects that:

[0023] The anti-overflow fluid automatic coating gun of the present invention is powered by a power assembly, which drives the driving shaft to translate in the installation cavity, pushing the first abutting end to abut against the second abutting end, and forming a linear contact at the connection between the first abutting end and the second abutting end. Under the same pressure conditions, the smaller the contact surface, the greater the contact surface pressure. The linear contact increases the interaction force between the first abutting end and the second abutting end. The two are tightly combined to cut off the connecting channel between the paint flow channel and the spray channel, achieving a mechanical sealing effect, thereby improving the sealing performance of the material flow outlet position at the tail of the anti-overflow fluid automatic coating gun. During use, paint is supplied through the feed hole into the interior of the anti-spill fluid automatic coating gun. The paint flows through the paint flow channel and accumulates a certain amount of pressure. The power assembly provides power to drive the drive shaft to translate within the mounting cavity, causing the first abutting end to move away from the second abutting end, thereby opening a flow gap formed between the first abutting end and the second abutting end, thereby connecting the paint flow channel with the spray channel. The fluid paint in the paint flow channel instantly passes through the narrow flow gap and is released through the spray channel in a spray-like manner, thereby achieving a fluid paint sealing operation. By setting the power assembly to continuously provide power in a normal state, the power assembly continuously provides thrust to the drive shaft toward the sealing bushing, so that the first abutting end has kinetic energy to move toward the second abutting end, thereby applying corresponding pressure to the contact surface with the second abutting end, thereby tightly fitting the two. By setting the contact surface between the two to be in linear contact, the contact pressure is maximized, the gap is eliminated, and thus the paint overflow caused by pressure leakage in the mounting cavity of the gun body is prevented, thereby optimizing the sealing performance of the gun body. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of the automatic fluid coating gun for preventing overflow of the present invention;

[0025] Figure 2 This is a top view of the automatic fluid application gun for preventing spillage of the present invention;

[0026] Figure 3 This is a cross-sectional view of the utility model's anti-overflow fluid automatic coating gun;

[0027] Figure 4 This is a partial enlarged view of part A of the automatic fluid-spill prevention applicator gun of the present invention;

[0028] Figure 5 This is a front view of the power assembly of the automatic fluid-spill prevention applicator gun of the present invention;

[0029] Figure 6 This is a cross-sectional view of the BB section of the power assembly of the automatic fluid coating gun for preventing spillage of the present invention;

[0030] Figure 7This is a front view of the paint gun body assembly of the automatic fluid spill-proof coating gun of the present invention;

[0031] Figure 8 A cross-sectional view of the CC section of the paint gun body assembly of the automatic coating gun for preventing fluid spillage according to the present invention;

[0032] Figure 9 This is a partial enlarged view of part D of the automatic fluid spill prevention gun of the present invention;

[0033] Figure 10 This is a front view of the nozzle connection sleeve assembly of the automatic fluid spill-proof coating gun of the present invention;

[0034] Figure 11 This is a cross-sectional view of the EE section of the nozzle connection sleeve assembly of the automatic fluid spill-proof coating gun of the present invention.

[0035] In the figure: 10, power assembly; 11, cylinder cover; 111, connecting lock hole; 12, cylinder piston; 121, piston part; 122, connecting part; 13, sealing gasket; 14, cylinder chamber; 15, third sealing ring; 16, fourth sealing ring; 17, fastening bolt; 20, paint gun body assembly; 21, gun body; 211, first end; 212, first connecting section; 2121, air guide hole; 2122, air delivery hole; 213, sealing section; 2131, sealing member mounting groove; 2132, limiting hole; 2133, limiting screw; 2134, through groove; 214, Paint supply section; 2135, paint flow channel; 2136, feed hole; 215, second connecting section; 216, second end; 22, drive shaft; 221, drive end; 222, first abutment end; 23, sealing structure; 231, drive shaft sleeve; 232, sealing ring assembly; 233, sealing ring support ring; 30, nozzle connecting sleeve assembly; 31, nozzle connecting head; 311, spray channel; 312, first sealing ring; 313, spray step; 32, sealing bushing; 321, feed channel; 322, second abutment end; 323, discharge end; 33, locking nut. DETAILED DESCRIPTION

[0036] Below, in conjunction with the accompanying drawings and specific embodiments, the utility model is further described. It should be noted that, under the premise of no conflict, the various embodiments described below or the various technical features can be arbitrarily combined to form a new embodiment. Unless otherwise specified, the materials and equipment used in this embodiment can be purchased from the market. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar numbers throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and cannot be understood as limiting this application.

[0037] In the description of this application, it should be understood that the terms "upper," "lower," "front," "back," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting this application. In the description of this application, "plurality" means two or more, unless otherwise specifically specified.

[0038] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "connected," "connected," and "connected" should be understood in a broad sense. For example, they may refer to a fixed connection, a connection through an intermediary medium, internal communication between two components, or an interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0039] The terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or sequential sequence. In addition, the terms "including," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to the process, method, product, or apparatus.

[0040] like Figure 1-11 As shown, this embodiment provides an anti-overflow fluid automatic coating gun, including a paint gun body assembly 20, and a power assembly 10 and a gun nozzle connecting sleeve assembly 30 respectively installed at the opposite ends of the paint gun body assembly 20, so as to solve the problem of spillage of existing paint gun body materials and affecting production quality.

[0041] The paint gun assembly 20 of this embodiment includes a gun body 21 , a drive shaft 22 and a sealing structure 23 installed inside the gun body 21 .

[0042] The gun body 21 is a regular columnar structure, and two ends thereof are formed with a first end portion 211 and a second end portion 216, respectively. An installation cavity is formed in the gun body 21, and the installation cavity is communicated with the first end portion 211 and the second end portion 216. The installation cavity is sequentially formed with a first connecting section 212, a sealing section 213, a paint supply section 214 and a second connecting section 215 from the first end portion 211 to the second end portion 216. The first connecting section 212 is used for installing the power assembly 10. The sealing section 213 is used for installing the sealing structure 23. The paint supply section 214 is used for supplying paint, and a paint overflow passage 2135 is formed in the paint supply section. An inlet hole 2136 is formed in the paint supply section. The second connecting section 215 is used for installing the gun nozzle connecting sleeve assembly 30. The driving shaft 22 is arranged in the installation cavity, and two ends of the driving shaft 22 are extended to the first connecting section 212 and the second connecting section 215, respectively, and are formed with a driving end 221 and a first abutting end 222, respectively.

[0043] The gun nozzle connecting head 31 is installed in the second connecting section 215, and the gun nozzle connecting sleeve assembly 30 comprises the gun nozzle connecting head 31 and a sealing sleeve 32. The gun nozzle connecting sleeve assembly 30 is formed by an irregular sleeve structure. The gun nozzle connecting head 31 is internally formed with a paint spraying passage 311. The sealing sleeve 32 is arranged at one end of the paint spraying passage 311 close to the gun body 21. The sealing sleeve 32 is internally formed with a paint overflow passage 321. Two ends of the paint overflow passage 321 are formed with a second abutting end 322 and a paint outlet end 323, respectively. The paint outlet end 323 is communicated with the paint spraying passage 311, and the second abutting end 322 is arranged close to the gun body 21.

[0044] The power assembly 10 is installed in the first connecting section 212, and the power assembly 10 is connected with the driving end 221 of the driving shaft 22. The power assembly 10 provides power to drive the driving shaft 22 to translate in the installation cavity, so as to make the first abutting end 222 close to or away from the second abutting end 322. When the first abutting end 222 is close to the second abutting end 322, linear contact is formed between the first abutting end 222 and the second abutting end 322, the paint overflow passage 2135 is cut off from the paint spraying passage 311. When the first abutting end 222 is away from the second abutting end 322, an overflow gap is formed between the first abutting end 222 and the second abutting end 322, and the paint overflow passage 2135 is communicated with the paint spraying passage 311.

[0045] The anti-overflow fluid automatic coating gun of this embodiment is powered by the power assembly 10, which drives the drive shaft 22 to translate within the mounting cavity, pushing the first abutting end 222 against the second abutting end 322. Linear contact is formed at the connection between the first abutting end 222 and the second abutting end 322. Under the same pressure conditions, the smaller the contact surface, the greater the contact surface pressure. This linear contact increases the interaction force between the first abutting end 222 and the second abutting end 322. The tight connection between the two separates the paint flow channel 2135 from the spray channel 311, achieving a mechanical seal and improving the sealing of the material outflow outlet at the rear of the anti-overflow fluid automatic coating gun. During use, paint is supplied into the anti-overflow fluid automatic coating gun through the feed hole 2136. The paint flows through the paint flow channel 2135 and accumulates a certain amount of pressure. The power component 10 provides power to drive the drive shaft 22 to translate in the installation cavity, and the first abutment end 222 moves away from the second abutment end 322, opening the flow gap formed between the first abutment end 222 and the second abutment end 322, so that the paint flow channel 2135 is connected to the spray channel 311, and the fluid paint in the paint flow channel 2135 instantly passes through the narrow flow gap to form a spray shape and is released through the spray channel 311, thereby realizing the sealing operation of the fluid paint. The anti-overflow fluid automatic coating gun of this embodiment is provided with a power component 10. Under normal conditions, the power component 10 continuously provides power and continuously provides a driving force to the drive shaft 22 to move in the direction of the sealing bushing 32, so that the first abutting end 222 has kinetic energy to move toward the second abutting end 322, and can provide corresponding pressure to the contact surface against the second abutting end 322, so that the two are tightly fitted; and by setting the contact surface of the two to linear contact, the pressure of the contact surface is maximized and the gap is eliminated, thereby preventing the gun body 21 from causing material overflow due to pressure leakage in the installation cavity, and optimizing the sealing performance of the gun body.

[0046] Please refer to Figure 2-3 As shown, the first abutting end 222 of this embodiment has a circumferentially tapered surface that gradually narrows toward the end; the inner edge of the second abutting end 322 is an outer annular curved surface. The tapered surface and the outer annular curved surface are coaxially arranged, so that when the first abutting end 222 approaches the second abutting end 322, an annular line contact is formed between the tapered surface and the outer annular curved surface. By designing one end of the drive shaft 22 as a cone and the contact point of the nozzle connector assembly 30 as an outer arc, an annular line contact is achieved when the first abutting end 222 and the second abutting end 322 contact, increasing contact pressure while eliminating dead angles and further enhancing the gun's anti-overflow effect. Furthermore, the coordination between the tapered surface and the outer annular curved surface ensures a smooth transition of fluid coating from the coating flow channel 2135 to the flow gap, eliminating turbulence near the flow gap and improving spraying efficiency.

[0047] The nozzle connector 31 has an annular groove formed around its circumference, within which a first sealing ring 312 is embedded. The first sealing ring 312 is an O-ring. An externally threaded section is formed around the nozzle connector 31, which is threadedly connected to the second connecting section 215 to attach the nozzle connector 31 to the gun body 21. The installed first sealing ring 312 is fixed between the second connecting section 215 and the nozzle connector 31, forming a sealing surface at the contact point, sealing the connection between the gun body 21 and the nozzle connector 31.

[0048] The nozzle connector assembly 30 further includes a locking nut 33, which is threadedly engaged with the threaded section. Friction is generated between the end surface of the locking nut 33 and the end surface of the gun body 21. Simultaneously, the locking nut 33 causes the threaded section to axially stretch, providing a locking force to lock the relative position between the nozzle connector 31 and the gun body 21. This prevents vibrations during the spraying operation from causing the nozzle connector 31 and the gun body 21 to become loose, thereby affecting the relative position of the first abutting end 222 and the second abutting end 322.

[0049] Furthermore, the spray channel 311 of the nozzle connector 31 is formed with a countersunk hole at one end near the gun body 21; the outer edge of the discharge end 323 of the sealing bushing 32 is formed with a tapered guide surface; the sealing bushing 32 is interference-fitted into the countersunk hole at the end of the spray channel 311 through the tapered guide surface, and is press-fitted into an integral body. The first abutting end 222 of the drive shaft 22 can also be set to a detachable mode. By designing the drive shaft 22 and the nozzle connector 31 as independent bodies and providing the detachable first abutting end 222 and second abutting end 322 as contact surfaces, after long-term use, only the first abutting end 222 or the sealing bushing 32 in direct contact needs to be replaced, without the need to repair or replace the entire body. This not only increases the service life but also effectively reduces costs.

[0050] In this embodiment, a plurality of spraying steps 313 are formed in the spraying channel 311. When the spraying material passes through the spraying steps 313 with different diameters, eddy currents will be generated to generate self-resistance, thereby reducing the reverse spraying of the spraying material and improving the anti-overflow effect.

[0051] Furthermore, a static seal is formed between the sealing structure 23 and the inner wall of the installation cavity, and a dynamic seal is formed between the sealing structure 23 and the drive shaft 22 .

[0052] Specifically, a seal installation groove 2131 is provided on the inner wall of the sealing section 213 of the gun body 21; the sealing structure 23 includes a drive shaft sleeve 231, a sealing ring assembly 232 and a sealing ring supporting ring 233; the sealing ring assembly 232 includes a plurality of second sealing rings, the cross section of the second sealing ring is V-shaped, the V-shaped opening of the second sealing ring is set in the direction of the paint flow channel 2135, and the tip is set in the direction of the first connecting section 212; the connection surface between the sealing ring supporting ring 233 and the sealing ring assembly 232 forms a protrusion adapted to the V-shaped opening, and the connection surface between the drive shaft sleeve 231 and the sealing ring assembly 232 forms a groove adapted to the V-shaped tip; the sealing ring assembly 232 is clamped and fixed in the seal installation groove 2131 by the sealing ring supporting ring 233 and the drive shaft sleeve 231, so that the V-shaped opening of the second sealing ring , outer ring, and V-shaped tip form sealing surfaces with the sealing ring supporting ring 233, the gun body 21, and the drive shaft sleeve 231 respectively; the inner ring of the second sealing ring forms a sealing surface with the drive shaft 22; when the paint in the paint flow channel 2135 is pressurized and impacts the connection between the second sealing ring and the drive shaft 22, the V-shaped opening of the second sealing ring is expanded and the inner ring is reduced to fit tightly with the drive shaft 22. Through the mutual cooperation of the drive shaft sleeve 231, the sealing ring assembly 232 and the sealing ring supporting ring 233, it is ensured that the drive shaft 22 maintains good contact force during frequent reciprocating motion to prevent leakage of fluid paint. The pressure of the fluid paint on the V-shaped edge of the second sealing ring is used to expand the V-shaped opening and reduce the inner ring of the second sealing ring, so that it can fit more closely to the surface of the drive shaft 22, thereby enhancing the sealing effect. The greater the pressure of the fluid paint, the better the sealing effect.

[0053] In this embodiment, a limiting hole 2132 is radially provided on the gun body 21; the limiting hole 2132 is arranged at one end of the seal mounting groove 2131 close to the first connecting section 212; a limiting screw 2133 is threaded into the limiting hole 2132, and the end of the limiting screw 2133 abuts against the end surface of the drive shaft sleeve 231, thereby limiting the sealing structure 23 within the seal mounting groove 2131.

[0054] A through groove 2134 is radially opened on the gun body 21; the through groove 2134 is connected to the seal installation groove 2131, and the through groove 2134 allows the drive sleeve 231, the sealing ring assembly 232 or the sealing ring supporting ring 233 to pass through. The through groove 2134 is used to install the drive sleeve 231, the sealing ring assembly 232 or the sealing ring supporting ring 233 into the seal installation groove 2131, so as to facilitate the installation and replacement of the sealing structure 23.

[0055] The power assembly 10 of the embodiment comprises a cylinder cover 11 and a cylinder piston 12. The cylinder cover 11 is screwed to the first end 211 of the gun body 21, and a sealing gasket 13 is arranged at the connection between the cylinder cover 11 and the gun body 21. A cylinder cavity 14 is formed between the cylinder cover 11 and the first connecting section 212. The cylinder piston 12 is movably connected in the cylinder cavity 14, and the cylinder piston 12 is connected with the driving end 221 of the driving shaft 22. The cylinder brake provides stable and continuous thrust for the driving shaft 22, so that the first abutting end 222 abuts against the second abutting end 322 under stable and continuous pressure.

[0056] Further, the cylinder cover 11 has an end plate, and a square boss is arranged on the end plate of the cylinder cover 11. A connecting lock hole 111 is arranged at the center point of the square boss. One end of the connecting lock hole 111 is in communication with the top of the cylinder cavity 14, and a gas pipe joint is arranged at the other end of the connecting lock hole 111. The gas pipe joint is connected with a first gas source device. A gas guide hole 2121 is axially arranged in the inner end surface of the first connecting section 212 of the gun body 21. A gas delivery hole 2122 is radially arranged in the first connecting section 212 of the gun body 21. One end of the gas guide hole 2121 is in communication with the bottom of the cylinder cavity 14, and the other end of the gas guide hole 2121 is in communication with the gas delivery hole 2122. The other end of the gas delivery hole 2122 is connected with a second gas source device. The gas guide hole 2121 and the gas delivery hole 2122 arranged in the first connecting section 212 guide the gas in the cylinder cavity 14 to the outside, so as to avoid the influence of the pressure difference on the brake of the driving shaft. The power assembly 10 connected with the double gas sources can provide greater pressure to the driving shaft 22 in a smaller volume, so as to ensure the close abutment between the first abutting end 222 and the second abutting end 322.

[0057] The cylinder piston 12 comprises a piston part 121 and a connecting part 122. The piston part 121 is in the shape of a circular truncated cone, and an annular groove is circumferentially arranged in the piston part 121. A third sealing ring 15 is embedded in the annular groove of the piston part 121. The connecting part 122 is coaxially arranged with the piston part 121 and is in the shape of a cylinder. An annular groove is circumferentially arranged in the piston part 121, and a fourth sealing ring 16 is embedded in the annular groove of the piston part 121. The third sealing ring 15 and the fourth sealing ring 16 are both O-shaped sealing rings.

[0058] A counterbore is arranged at one end of the cylinder piston 12 close to the cylinder cover 11, and a connecting hole is arranged at the other end of the cylinder piston 12 close to the driving shaft 22. The connecting hole is in interference fit with the driving end 221 of the driving shaft 22. The driving shaft 22 and the cylinder piston 12 are fixedly connected by a fastening bolt 17.

[0059] Several mounting holes are provided on the outside of the gun body 21, and the mounting holes are used to cooperate with the tooling fixture; specifically, threaded holes are provided on the three sides of the outside of the gun body 21 near the second end 216, and the anti-overflow fluid automatic coating gun is fixed on a specific fixture with fixing bolts for operation.

[0060] The cylinder piston 12, drive shaft 22, gun body 21, nozzle connector 31 and sealing bushing 32 are all coaxially arranged. The above embodiment is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention fall within the scope of protection claimed by the present invention.

Claims

1. An anti-spill fluid automatic coating gun, characterized in that: It includes a power assembly, a paint gun body assembly and a gun nozzle connecting sleeve assembly; The paint gun body assembly includes a gun body, a drive shaft and a sealing structure; the two ends of the gun body respectively form a first end and a second end, and a mounting cavity is formed inside the gun body, and the mounting cavity communicates with the first end and the second end; the mounting cavity is sequentially formed with a first connecting section, a sealing section, a paint supply section and a second connecting section from the first end to the second end; a paint flow channel is formed in the paint section, and a material feed hole is opened on the paint section; the drive shaft is arranged in the mounting cavity, and the two ends of the drive shaft respectively form a driving end and a first abutting end; The gun nozzle connecting sleeve assembly includes a gun nozzle connecting head and a sealing bushing; the gun nozzle connecting head is installed on the second connecting section, and a spraying channel is formed inside the gun nozzle connecting head; the sealing bushing is arranged at one end of the spraying channel close to the gun body, and a passing channel is formed inside the sealing bushing, and a second abutting end and a discharging end are formed at both ends of the passing channel respectively, the discharging end is connected to the spraying channel, and the second abutting end is arranged close to the gun body; a flow gap is formed between the first abutting end and the second abutting end; The power assembly is installed on the first connecting section, and the power assembly is connected to the driving end of the driving shaft; The power component provides power to drive the drive shaft to translate in the installation cavity, so that the first abutting end is close to or away from the second abutting end, and the flow gap is cut off or opened.

2. The anti-spill fluid automatic coating gun according to claim 1, characterized in that: A linear contact is formed between the first abutting end and the second abutting end; The first abutting end is a conical surface in the circumference; the inner wall edge of the second abutting end is an outer annular curved surface; the conical surface and the outer annular curved surface are coaxially arranged, and when the first abutting end approaches the second abutting end, an annular line contact is formed between the conical surface and the outer annular curved surface.

3. The anti-spill fluid automatic coating gun according to claim 2, characterized in that: An annular groove is formed around the nozzle connector, and a first sealing ring is embedded in the annular groove, and the first sealing ring is an O-ring; a threaded section is formed around the nozzle connector, and the nozzle connector is installed on the gun body by screwing the threaded section and the second connecting section; the nozzle connecting sleeve assembly also includes a locking nut, and the locking nut is screwed to the threaded section.

4. The anti-overflow fluid automatic coating gun according to claim 2, characterized in that: A countersunk hole is formed on one end of the spraying channel of the nozzle connector close to the gun body; the sealing bushing is interference-fitted in the countersunk hole at the end of the spraying channel; and a plurality of spraying steps are formed in the spraying channel.

5. The anti-spill fluid automatic coating gun according to claim 1, characterized in that: A static seal is formed between the sealing structure and the inner wall of the installation cavity, and a dynamic seal is formed between the sealing structure and the drive shaft.

6. The anti-spill fluid automatic coating gun according to claim 5, characterized in that: The inner wall of the sealing section of the gun body is provided with a sealing member installation groove; The sealing structure includes a drive sleeve, a sealing ring assembly and a sealing ring supporting ring; the sealing ring assembly includes a plurality of second sealing rings, the cross-section of the second sealing ring is V-shaped, the V-shaped opening of the second sealing ring is arranged in the direction of the paint flow channel, and the tip is arranged in the direction of the first connecting section; the connection surface between the sealing ring supporting ring and the sealing ring assembly forms a protrusion that is adapted to the V-shaped opening, and the connection surface between the drive sleeve and the sealing ring assembly forms a groove that is adapted to the V-shaped tip; the sealing ring assembly is clamped and fixed in the seal mounting groove by the sealing ring supporting ring and the drive sleeve, so that the V-shaped opening, outer ring and V-shaped tip of the second sealing ring form sealing surfaces with the sealing ring supporting ring, the gun body and the drive sleeve respectively; the inner ring of the second sealing ring forms a sealing surface with the drive shaft.

7. The anti-spill fluid automatic coating gun according to claim 6, characterized in that: A limiting hole is radially formed on the gun body; the limiting hole is arranged at one end of the seal installation groove close to the first connecting section; a limiting screw is threaded into the limiting hole, and the end of the limiting screw abuts against the end surface of the drive shaft sleeve to limit the sealing structure within the seal installation groove; The gun body is radially provided with a through groove; the through groove is connected to the seal installation groove, and the through groove allows the drive sleeve, sealing ring assembly or sealing ring supporting ring to pass through, and the through groove is used to install the drive sleeve, sealing ring assembly or sealing ring supporting ring into the seal installation groove.

8. The anti-spill fluid automatic coating gun according to claim 1, characterized in that: The power assembly includes a cylinder cover and a cylinder piston; the cylinder cover is screwed to the first end of the gun body, a sealing gasket is provided at the connection between the cylinder cover and the gun body, and a cylinder cavity is formed between the cylinder cover and the first connecting section; the cylinder piston is movably connected in the cylinder cavity, and the cylinder piston is connected to the driving end of the drive shaft.

9. The anti-spill fluid automatic coating gun according to claim 8, characterized in that: The cylinder cover has an end plate, a connecting lock hole is provided in the center of the cylinder cover end plate, one end of the connecting lock hole is connected to the top of the cylinder cavity, and the other end of the connecting lock hole is provided with an air pipe joint, and the air pipe joint is connected to the first air source device; An air guide hole is axially opened on the inner end surface of the first connecting section of the gun body; an air delivery hole is radially opened on the first connecting section of the gun body; one end of the air guide hole is connected to the bottom of the cylinder cavity, and the other end is connected to the air delivery hole, and the other end of the air delivery hole is connected to a second air source device.

10. The anti-spill fluid automatic coating gun according to claim 9, characterized in that: The cylinder piston includes a piston portion and a connecting portion; the piston portion is truncated cone-shaped, with an annular groove formed in the circumference thereof, and a third sealing ring is embedded in the annular groove of the piston portion; the connecting portion is cylindrical and coaxially arranged with the piston portion, with an annular groove formed in the circumference thereof, and a fourth sealing ring is embedded in the annular groove of the piston portion; the third sealing ring and the fourth sealing ring are both O-rings; The cylinder piston is provided with a countersunk hole at one end close to the cylinder cover, and a connecting hole at one end close to the drive shaft; the connecting hole is interference fit with the drive end of the drive shaft; the drive shaft and the cylinder piston are screwed and fixed by fastening bolts.

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