Anti-overflow fluid automatic smearing gun

Abstract

The invention discloses an anti-overflow fluid automatic smearing gun. The anti-overflow fluid automatic smearing gun 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, the gun nozzle connector is installed on the second connecting section, and the sealing bush forms a second abutting end; the power assembly provides power to enable the first abutting end to be close to or away from the second abutting end, linear contact is formed between the first abutting end and the second abutting end, or an overflowing gap is formed between the first abutting end and the second abutting end. 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 invention relates to the technical field of fluid sealing in the industrial manufacturing industry, and in particular to an automatic fluid application gun to prevent overflow. Background Art

[0002] Fluid coating sealing is an important process in the industrial production and manufacturing processes such as automobile production, aerospace manufacturing, and shipbuilding. At present, in order to achieve the 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 various fluids with different viscosities and strengths that meet the sealing requirements to seal between the plates to ensure the tight combination of the structural fixtures. The existing gluing method uses manual application or pneumatic control to drive the gun body to move the glue according to the work requirements, but 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 progress. Summary of the invention

[0003] In order to overcome the deficiencies of the prior art, the present invention provides an anti-overflow fluid automatic coating gun, which has the characteristics of easy operation and use, good sealing effect, and can effectively prevent the fluid material from overflowing.

[0004] The present invention 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 main body, a driving shaft and a sealing structure; a first end and a second end are respectively formed at two ends of the gun body main body, and an installation cavity is formed inside the gun body main body, and the installation cavity communicates the first end and the second end; the installation 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; the first connecting section is used to install the power component; the sealing section is used to install the sealing structure; the paint supply section is used to supply paint, a paint flow channel is formed in the paint section, and a feed hole is opened on the paint section; the second connecting section is used to install the gun nozzle connecting sleeve assembly; the driving shaft is inserted into the installation cavity, and a driving end and a first abutting end are respectively formed at two ends of the driving shaft;

[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 material passing channel is formed inside the sealing bushing, and a second abutting end and a material discharging end are respectively formed at both ends of the material passing channel, the material discharging end is connected with the spraying channel, and the second abutting end is arranged close to the gun body;

[0007] The power component is installed on the first connecting section, and the power component is connected to the driving end of the driving shaft; the power component provides power to drive the driving shaft to translate in the installation cavity, so that the first abutment end is close to or away from the second abutment end. When the first abutment end is close to the second abutment end, a linear contact is formed between the first abutment end and the second abutment end, and the paint flow channel and the spray channel are cut off. When the first abutment end is away from the second abutment end, a flow gap is formed between the first abutment end and the second abutment end, and the paint flow channel and the spray channel are connected.

[0008] As a preferred embodiment, the first abutment end is a conical surface in the circumference; the inner wall edge of the second abutment end is an outer annular curved surface; the conical surface and the outer annular curved surface are coaxially arranged, and when the first abutment end is close to the second abutment end, an annular line contact is formed between the conical surface and the outer annular curved surface.

[0009] 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, and the first sealing ring is fixed between the second connecting section and the gun nozzle connector to form a sealing surface;

[0010] The gun nozzle connecting sleeve assembly also includes a locking nut, which is threadedly connected to the threaded section. Friction force is generated between the end face of the locking nut and the end face of the gun body. At the same time, the locking nut causes the threaded section to produce axial stretching to provide a locking force, thereby locking the relative position between the gun nozzle connector and the gun body.

[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;

[0012] The outer peripheral edge of the discharge end of the sealing bushing is formed with a conical guide surface; the sealing bushing is interference-fitted into the countersunk hole at the end of the injection channel through the conical guide surface;

[0013] A plurality of spraying steps are formed in the spraying channel. When the spraying material passes through the spraying steps with different diameters, eddy currents will be generated to generate self-resistance, thereby reducing the reverse spraying of the spraying material.

[0014] 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.

[0015] As a preferred embodiment, a sealing member installation groove is provided on the inner wall of the sealing section of the gun body;

[0016] The sealing structure comprises a driving shaft sleeve, a sealing ring assembly and a sealing ring supporting ring; the sealing ring assembly comprises a plurality of second sealing rings, the second sealing ring having a V-shaped cross section, the V-shaped opening of the second sealing ring being arranged in the direction of the paint flow passage, and the tip being arranged in the direction of the first connecting section; the connecting surface between the sealing ring supporting ring and the sealing ring assembly forms a protrusion adapted to the V-shaped opening, and the connecting surface between the driving shaft sleeve and the sealing ring assembly forms a groove adapted to the V-shaped tip; the sealing ring assembly is clamped and fixed in the sealing component mounting groove by the sealing ring supporting ring and the driving shaft sleeve, so that the V-shaped opening, outer ring and V-shaped tip of the second sealing ring respectively form sealing surfaces with the sealing ring supporting ring, the gun body and the driving shaft sleeve; the inner ring of the second sealing ring forms a sealing surface with the driving shaft;

[0017] When the paint in the paint flow channel is pressurized and impacts the connection between the second sealing ring and the drive shaft, the V-shaped opening of the second sealing ring is enlarged and the inner ring is shrunk to fit closely with the drive shaft.

[0018] As a preferred embodiment, the gun body body is radially provided with a limiting hole; the limiting hole is arranged at one end of the seal installation groove close to the first connecting section; a limiting screw is threaded in 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 in the seal installation groove;

[0019] The gun body has a radially formed through groove, which is connected to the seal installation groove. The through groove allows the drive sleeve, the seal ring assembly or the seal ring support ring to pass through. The through groove is used to install the drive sleeve, the seal ring assembly or the seal ring support ring into the seal installation groove.

[0020] As a preferred embodiment, 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 driving shaft.

[0021] As a preferred embodiment, the cylinder cover has an end plate, a connecting lock hole is provided at the center of the cylinder cover end plate, one end of the connecting lock hole is communicated with 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;

[0022] 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.

[0023] As a preferred embodiment, the cylinder piston includes a piston part and a connecting part; the piston part is truncated cone-shaped, an annular groove is formed in the circumference of the piston part, a third sealing ring is embedded in the annular groove of the piston part, the connecting part is a cylindrical shape coaxially arranged with the piston part, an annular groove is formed in the circumference of the piston part, a fourth sealing ring is embedded in the annular groove of the piston part, and both the third sealing ring and the fourth sealing ring are O-rings;

[0024] The cylinder piston has 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;

[0025] A plurality of mounting holes are provided on the outside of the gun body, and the mounting holes are used to cooperate with the tooling fixture;

[0026] The cylinder piston, the driving shaft, the gun body, the gun nozzle connector and the sealing bushing are all coaxially arranged.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The anti-overflow fluid automatic coating gun of the present invention is powered by a power component, which drives the driving shaft to translate in the installation cavity, pushing the first abutment end to abut against the second abutment end, and forming a linear contact at the connection between the first abutment end and the second abutment 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 abutment end and the second abutment end. The two are tightly combined to cut off the connecting channel between the paint flow channel and the spray channel, thereby 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. When in use, the paint is supplied into the anti-overflow fluid automatic coating gun through the feed hole, the paint passes through the paint flow channel and accumulates a certain pressure, the power component provides power, the drive shaft is driven to translate in the installation cavity, the first abutment end is away from the second abutment end, the flow gap formed between the first abutment end and the second abutment end is opened, so that the paint flow channel is connected with the spraying channel, and the fluid paint in the paint flow channel is instantly released through the narrow flow gap through the narrow flow gap to form a spray shape through the spraying channel, so as to achieve the fluid paint sealing operation. By setting the power component under the normal state of the power component to continuously provide power, the drive shaft is continuously provided with a thrust to move in the direction of the sealing bushing, so that the first abutment end has kinetic energy to move in the direction close to the second abutment end, and can provide corresponding pressure to the contact surface against the second abutment end, so that the two are closely fitted; and by setting the contact surface of the two to linear contact, the pressure of the contact surface is maximized, the gap is eliminated, thereby preventing the paint from overflowing due to pressure leakage in the installation cavity of the gun body, and optimizing the sealing of the gun body. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the automatic spray gun for preventing fluid from overflowing according to the present invention;

[0030] Figure 2 A top view of the automatic fluid application gun for preventing spillage of the present invention;

[0031] Figure 3 A cross-sectional view of the automatic fluid application gun for preventing spillage of the present invention;

[0032] Figure 4 It is a partial enlarged view of the part A of the automatic spray gun for preventing overflow of fluid of the present invention;

[0033] Figure 5 It is a front view of the power assembly of the automatic spray gun for preventing spillage of fluid of the present invention;

[0034] Figure 6 It is a cross-sectional view of the section BB of the power assembly of the automatic fluid application gun for preventing spillage of the present invention;

[0035] Figure 7A front view of a coating gun body assembly of an automatic coating gun for preventing spillage of fluid according to the present invention;

[0036] Figure 8 A cross-sectional view of the CC section of the paint gun body assembly of the anti-overflow fluid automatic coating gun of the present invention;

[0037] Fig. 9 It is a partial enlarged view of a portion D of the automatic spray gun for preventing overflow of fluid of the present invention;

[0038] Fig.10 It is a front view of the nozzle connection sleeve assembly of the automatic fluid spill-proof coating gun of the present invention;

[0039] Fig.11 It is a cross-sectional view of the section EE of the nozzle connecting sleeve assembly of the automatic fluid-spill prevention gun of the present invention.

[0040] 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 installation groove; 2132, limiting hole; 2133, limiting screw; 2134, through groove; 214, Paint supply section; 2135, paint flow channel; 2136, feed hole; 215, second connection 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, gun nozzle connecting sleeve assembly; 31, gun nozzle connecting head; 311, spray channel; 312, first sealing ring; 313, spray step; 32, sealing bushing; 321, material flow channel; 322, second abutment end; 323, discharge end; 33, locking nut. DETAILED DESCRIPTION

[0041] Below, in conjunction with the accompanying drawings and specific embodiments, the invention 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. Except as 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 reference numerals 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 the present application, and cannot be understood as limiting the present application.

[0042] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In the description of the present application, "plurality" means two or more, unless otherwise precisely and specifically specified.

[0043] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be connected through an intermediary medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0045] 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 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.

[0046] The paint gun assembly 20 of this embodiment includes a gun body 21 , and a driving shaft 22 and a sealing structure 23 installed inside the gun body 21 .

[0047] The gun body 21 is a regular columnar structure, with a first end 211 and a second end 216 formed at two ends respectively, and an installation cavity is formed inside the gun body 21, and the installation cavity communicates the first end 211 and the second end 216; the installation cavity is formed with a first connecting section 212, a sealing section 213, a paint supply section 214 and a second connecting section 215 in sequence from the first end 211 to the second end 216; the first connecting section 212 is used to install the power component 10; the sealing section 213 is used to install the sealing structure 23; the paint supply section 214 is used to supply paint, and a paint flow channel 2135 is formed in the paint section, and a feed hole 2136 is opened on the paint section; the second connecting section 215 is used to install the gun nozzle connecting sleeve assembly 30; the drive shaft 22 is arranged in the installation cavity, and the two ends of the drive shaft 22 extend to the first connecting section 212 and the second connecting section 215 respectively, forming a driving end 221 and a first abutting end 222 respectively.

[0048] The gun nozzle connector 31 is installed on the second connecting section 215, and the gun nozzle connecting sleeve assembly 30 includes a gun nozzle connector 31 and a sealing bushing 32; the gun nozzle connecting sleeve assembly 30 is formed by processing an irregular sleeve structure, and a spray channel 311 is formed inside the gun nozzle connector 31; the sealing bushing 32 is arranged at one end of the spray channel 311 close to the gun body 21, and a passing channel 321 is formed inside the sealing bushing 32, and a second abutting end 322 and a discharging end 323 are formed at both ends of the passing channel 321, respectively, and the discharging end 323 is connected to the spray channel 311, and the second abutting end 322 is arranged close to the gun body 21.

[0049] The power assembly 10 is installed on the first connecting section 212, and the power assembly 10 is connected to the driving end 221 of the driving shaft 22; the power is provided by the power assembly 10 to drive the driving shaft 22 to translate in the installation cavity, so that the first abutment end 222 is close to or away from the second abutment end 322. When the first abutment end 222 is close to the second abutment end 322, a linear contact is formed between the first abutment end 222 and the second abutment end 322, and the paint flow channel 2135 is cut off from the spray channel 311. When the first abutment end 222 is away from the second abutment end 322, a flow gap is formed between the first abutment end 222 and the second abutment end 322, and the paint flow channel 2135 is connected to the spray channel 311.

[0050] The anti-overflow fluid automatic coating gun of this embodiment is powered by the power assembly 10, driving the driving shaft 22 to translate in the installation cavity, pushing the first abutting end 222 to abut against the second abutting end 322, and forming a linear contact at the connection between the first abutting end 222 and the second abutting end 322. Under the same pressure condition, the smaller the contact surface, the greater the contact surface pressure. The linear contact increases the interaction force between the first abutting end 222 and the second abutting end 322. The two are closely combined to cut off the paint flow channel 2135 and the spray channel 311, achieving a mechanical sealing effect, so that the sealing of the material flow outlet position at the tail of the anti-overflow fluid automatic coating gun is improved. When in use, the paint is supplied into the interior of the anti-overflow fluid automatic coating gun through the feed hole 2136, and the paint passes through the paint flow channel 2135 and accumulates a certain pressure. Power is provided by the power assembly 10 to drive the driving shaft 22 to translate in the installation cavity, and the first abutment end 222 moves away from the second abutment end 322, so that the flow gap formed between the first abutment end 222 and the second abutment end 322 is opened, so that the paint flow channel 2135 is connected with 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. The power component 10 in normal state continuously provides power, and continuously provides driving force to the driving shaft 22 to move in the direction of the sealing bushing 32, so that the first abutting end 222 has kinetic energy to move in the direction close to the second abutting end 322, and can provide corresponding pressure to the contact surface abutting against the second abutting end 322, so that the two are tightly fitted; and by setting the contact surfaces 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 the pressure leakage of the installation cavity, and optimizing the sealing of the gun body.

[0051] Please refer to Figure 2-3 As shown, the first abutting end 222 of this embodiment is a conical surface that gradually narrows toward the end in the circumferential direction; the inner wall edge of the second abutting end 322 is an outer annular curved surface; the conical surface is coaxially arranged with the outer annular curved surface, so that when the first abutting end 222 approaches the second abutting end 322, an annular line contact is formed between the conical surface and the outer annular curved surface. By designing one end of the drive shaft 22 to be conical and designing the contact position of the gun nozzle connecting sleeve assembly 30 to be an outer arc shape, when the first abutting end 222 contacts the second abutting end 322, an annular line contact is achieved, while increasing the contact surface pressure, the dead angle is eliminated, and the anti-overflow effect of the gun body is further improved. At the same time, the cooperation of the conical surface and the outer annular curved surface forms a smooth transition effect when the fluid coating is released from the coating flow channel 2135 to the flow gap, and no turbulence turbulence will be generated near the flow gap, and the spraying effect is better.

[0052] The gun nozzle connector 31 is provided with an annular groove in the circumference, and a first sealing ring 312 is embedded in the annular groove, and the first sealing ring 312 is an O-ring; the gun nozzle connector 31 is provided with an external threaded section in the circumference, and the gun nozzle connector 31 is installed on the gun body 21 by screwing the external threaded section with the second connecting section 215. The installed first sealing ring 312 is fixed between the second connecting section 215 and the gun nozzle connector 31, and a sealing surface is formed at the contact point to seal the connection between the gun body 21 and the gun nozzle connector 31.

[0053] The gun nozzle connecting sleeve assembly 30 further includes a locking nut 33, which is screwed to the threaded section, and the end surface of the locking nut 33 generates friction with the end surface of the gun body 21. At the same time, the locking nut 33 causes the threaded section to generate axial stretching to provide a locking force, thereby locking the relative position between the gun nozzle connector 31 and the gun body 21. This prevents the gun nozzle connector 31 and the gun body 21 from becoming loose due to vibration during the spraying operation, thereby affecting the relative position between the first abutting end 222 and the second abutting end 322.

[0054] Furthermore, a countersunk hole is formed at one end of the spray channel 311 of the gun nozzle connector 31 near the gun body 21; a conical guide surface is formed on the outer peripheral edge of the discharge end 323 of the sealing bushing 32; the sealing bushing 32 is interference-fitted into the countersunk hole at the end of the spray channel 311 through the conical guide surface, and is press-fitted into an integral body. The first abutment end 222 of the drive shaft 22 can also be set to a detachable mode. By designing the drive shaft 22 and the gun nozzle connector 31 as independent bodies, and by providing the detachable first abutment end 222 and the second abutment end 322 as contact surfaces, after long-term use, only the first abutment end 222 or the sealing bushing 32 in direct contact needs to be replaced, and there is no need to repair or replace the entirety, which effectively reduces costs while increasing the service life.

[0055] 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.

[0056] 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 driving shaft 22 .

[0057] Specifically, a seal installation groove 2131 is provided on the inner wall of the seal section 213 of the gun body 21; the seal structure 23 includes a drive shaft sleeve 231, a seal ring assembly 232 and a seal ring supporting ring 233; the seal ring assembly 232 includes a plurality of second seal rings, the second seal rings have a V-shaped cross section, the V-shaped opening of the second seal ring is arranged in the direction of the paint flow channel 2135, and the tip is arranged in the direction of the first connecting section 212; the connection surface between the seal ring supporting ring 233 and the seal ring assembly 232 forms a protrusion adapted to the V-shaped opening, and the connection surface between the drive shaft sleeve 231 and the seal ring assembly 232 forms a groove adapted to the V-shaped tip; the seal ring assembly 232 is clamped and fixed in the seal installation groove 2131 by the seal ring supporting ring 233 and the drive shaft sleeve 231, so that the V-shaped opening of the second seal ring , outer ring, and V-shaped tip form sealing surfaces with the sealing ring supporting ring 233, the gun body 21, and the driving shaft sleeve 231 respectively; the inner ring of the second sealing ring forms a sealing surface with the driving shaft 22; when the paint in the paint flow channel 2135 is pressurized to impact the connection between the second sealing ring and the driving shaft 22, the V-shaped opening of the second sealing ring is enlarged and the inner ring is reduced to fit tightly with the driving shaft 22, and the driving shaft sleeve 231, the sealing ring assembly 232 and the sealing ring supporting ring 233 cooperate with each other to ensure that the driving shaft 22 maintains a good contact force during the frequent reciprocating movement to prevent the leakage of the fluid paint, and the pressure of the fluid paint on the V-shaped edge of the second sealing ring is used to enlarge 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 driving shaft 22, thereby enhancing the sealing effect, and has the characteristic that the greater the pressure of the fluid paint, the better the sealing effect.

[0058] In this embodiment, a limiting hole 2132 is radially opened on the gun body 21; the limiting hole 2132 is arranged at one end of the seal installation groove 2131 close to the first connecting section 212; a limiting screw 2133 is threadedly connected in the limiting hole 2132, and the end of the limiting screw 2133 abuts against the end surface of the driving shaft sleeve 231, thereby limiting the sealing structure 23 in the seal installation groove 2131.

[0059] 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.

[0060] The power assembly 10 of this embodiment includes 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, a sealing gasket 13 is provided at the connection between the cylinder cover 11 and the gun body 21, and 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 to the driving end 221 of the driving shaft 22. The cylinder brake provides a stable and continuous thrust for the driving shaft 22, so that the first abutting end 222 abuts against the second abutting end 322 under a stable and continuous pressure.

[0061] Furthermore, the cylinder cover 11 has an end plate, a square boss is arranged on the end plate of the cylinder cover 11, a connecting lock hole 111 is provided at the center point of the square boss, one end of the connecting lock hole 111 is communicated with the top of the cylinder chamber 14, and the other end of the connecting lock hole 111 is provided with an air pipe joint, and the air pipe joint is connected to a first air source device; an air guide hole 2121 is axially opened on the inner end surface of the first connecting section 212 of the gun body 21; an air delivery hole 2122 is radially opened on the first connecting section 212 of the gun body 21; one end of the air guide hole 2121 is communicated with the bottom of the cylinder chamber 14, and the other end is communicated with the air delivery hole 2122, and the other end of the air delivery hole 2122 is connected to a second air source device. By setting an air guide hole 2121 and an air delivery hole 2122 in the first connecting section 212, the cylinder chamber 14 is connected to the outside to avoid the pressure difference affecting the braking of the drive shaft. The power component 10 connected to the dual air source can provide greater pressure to the drive shaft 22 in a smaller volume, ensuring a tight fit between the first abutment end 222 and the second abutment end 322.

[0062] The cylinder piston 12 includes a piston portion 121 and a connecting portion 122; the piston portion 121 is truncated, and an annular groove is formed in the circumference of the piston portion 121, and a third sealing ring 15 is embedded in the annular groove of the piston portion 121; the connecting portion 122 is a cylindrical shape coaxially arranged with the piston portion 121, and an annular groove is formed in the circumference of the piston portion 121, and a fourth sealing ring 16 is embedded in the annular groove of the piston portion 121, and both the third sealing ring 15 and the fourth sealing ring 16 are O-rings;

[0063] The cylinder piston 12 is provided with a countersunk hole at one end close to the cylinder cover 11, and a connecting hole at one end close to the drive shaft 22; the connecting hole is interference fit with the drive end 221 of the drive shaft 22; the drive shaft 22 is screwed and fixed to the cylinder piston 12 by a fastening bolt 17;

[0064] A plurality of mounting holes are provided on the outside of the gun body 21, and the mounting holes are used to cooperate with tooling fixtures; specifically, threaded holes are provided on the three sides of the outside of one end of the gun body 21 close to the second end 216, and fixing bolts are used to fix the anti-overflow fluid automatic coating gun on a specific fixture for operation.

[0065] The cylinder piston 12, the drive shaft 22, the gun body 21, the gun nozzle connector 31 and the sealing bushing 32 are all coaxially arranged. The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention cannot be limited by them. Any non-substantial changes and substitutions made by those skilled in the art on the basis of the present invention belong to the protection scope 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 main body, a driving shaft and a sealing structure; a first end and a second end are respectively formed at two ends of the gun body main body, and an installation cavity is formed inside the gun body main body, and the installation cavity communicates the first end and the second end; the installation 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; the first connecting section is used to install the power component; the sealing section is used to install the sealing structure; the paint supply section is used to supply paint, a paint flow channel is formed in the paint section, and a feed hole is opened on the paint section; the second connecting section is used to install the gun nozzle connecting sleeve assembly; the driving shaft is inserted into the installation cavity, and a driving end and a first abutting end are respectively formed at two ends of the driving shaft; 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 material passing channel is formed inside the sealing bushing, and a second abutting end and a material discharging end are respectively formed at both ends of the material passing channel, the material discharging end is connected with the spraying channel, and the second abutting end is arranged close to the gun body; The power assembly is installed on the first connecting section, and the power assembly is connected to the driving end of the driving shaft; Power is provided by a power assembly to drive the drive shaft to translate in the installation cavity, so that the first abutment end is close to or away from the second abutment end. When the first abutment end is close to the second abutment end, a linear contact is formed between the first abutment end and the second abutment end, and the paint flow channel and the spray channel are cut off. When the first abutment end is away from the second abutment end, a flow gap is formed between the first abutment end and the second abutment end, and the paint flow channel and the spray channel are connected.

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

3. The anti-overflow fluid automatic coating gun according to claim 2, characterized in that: The gun nozzle connector is provided with an annular groove in the circumference thereof, 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, and the first sealing ring is fixed between the second connecting section and the gun nozzle connector to form a sealing surface; The gun nozzle connecting sleeve assembly also includes a locking nut, which is threadedly connected to the threaded section. Friction force is generated between the end face of the locking nut and the end face of the gun body. At the same time, the locking nut causes the threaded section to produce axial stretching to provide a locking force, thereby locking the relative position between the gun nozzle connector and the gun body.

4. The anti-overflow fluid automatic coating gun according to claim 2, characterized in that: A countersunk hole is formed at one end of the spray channel of the nozzle connector close to the gun body; The outer peripheral edge of the discharge end of the sealing bushing is formed with a conical guide surface; the sealing bushing is interference-fitted into the countersunk hole at the end of the injection channel through the conical guide surface; A plurality of spraying steps are formed in the spraying channel. When the spraying material passes through the spraying steps with different diameters, eddy currents will be generated to generate self-resistance, thereby reducing the reverse spraying of the spraying material.

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 driving 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 comprises a driving shaft sleeve, a sealing ring assembly and a sealing ring supporting ring; the sealing ring assembly comprises a plurality of second sealing rings, the second sealing ring having a V-shaped cross section, the V-shaped opening of the second sealing ring being arranged in the direction of the paint flow passage, and the tip being arranged in the direction of the first connecting section; the connecting surface between the sealing ring supporting ring and the sealing ring assembly forms a protrusion adapted to the V-shaped opening, and the connecting surface between the driving shaft sleeve and the sealing ring assembly forms a groove adapted to the V-shaped tip; the sealing ring assembly is clamped and fixed in the sealing component mounting groove by the sealing ring supporting ring and the driving shaft sleeve, so that the V-shaped opening, outer ring and V-shaped tip of the second sealing ring respectively form sealing surfaces with the sealing ring supporting ring, the gun body and the driving shaft sleeve; the inner ring of the second sealing ring forms a sealing surface with the driving shaft; When the paint in the paint flow channel is pressurized and impacts the connection between the second sealing ring and the drive shaft, the V-shaped opening of the second sealing ring is enlarged and the inner ring is shrunk to fit closely with the drive shaft.

7. The anti-spill fluid automatic coating gun according to claim 6, characterized in that: The gun body body is radially provided with a limiting hole; the limiting hole is arranged at one end of the seal installation groove close to the first connecting section; a limiting screw is threadedly connected in 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 in the seal installation groove; The gun body has a radially formed through groove, which is connected to the seal installation groove. The through groove allows the drive sleeve, the seal ring assembly or the seal ring support ring to pass through. The through groove is used to install the drive sleeve, the seal ring assembly or the seal ring support 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 driving 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 at the center of the cylinder cover end plate, one end of the connecting lock hole is communicated with 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 comprises a piston part and a connecting part; the piston part is truncated cone-shaped, an annular groove is formed in the circumference of the piston part, a third sealing ring is embedded in the annular groove of the piston part, the connecting part is cylindrically arranged coaxially with the piston part, an annular groove is formed in the circumference of the piston part, a fourth sealing ring is embedded in the annular groove of the piston part, and both the third sealing ring and the fourth sealing ring are O-rings; The cylinder piston has 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; A plurality of mounting holes are provided on the outside of the gun body, and the mounting holes are used to cooperate with the tooling fixture; The cylinder piston, the driving shaft, the gun body, the gun nozzle connector and the sealing bushing are all coaxially arranged.

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