A spray gun capable of conveniently switching on and off

Abstract

The present invention belongs to the technical field of spray guns, and in particular relates to a spray gun capable of convenient on-off switching, comprising a gun body, a gun nozzle, a trigger, an ejector pin and an ejector pin slide block, wherein the trigger is rotatably connected to the gun body, the trigger is used to link the ejector pin slide block, and the ejector pin slide block is used to link the ejector pin to open the gun nozzle, the gun body is provided with a limit gear, the inner side of the trigger is provided with a receiving cavity, the outer side surface is provided with a through hole penetrating the receiving cavity, and an active switch with a pre-tightening device is provided in the receiving cavity and the through hole, the switch is kept normally open or normally closed by the pre-tightening device, thereby changing the relative position of the switch and the limit gear, and then opening or closing the linkage between the trigger and the ejector pin slide block, thereby realizing convenient switching control of opening or closing the gun nozzle of the spray gun, quickly unlocking the trigger when the spray gun needs to be used, and quickly locking the trigger when the spray gun is not used, so as to avoid accidental spraying of polyurethane foam agent when the trigger is accidentally touched during construction to cause personal injury.

Description

Technical Field

[0001] The invention belongs to the technical field of spray guns, and in particular relates to a spray gun that can be conveniently switched on and off. Background Art

[0002] Since polyurethane foam curing foam elastomer has excellent properties such as bonding, waterproofing, resistance to thermal expansion and contraction, heat insulation, sound insulation and even flame retardancy (limited to flame retardant type), it is widely used in industrial production and daily civilian use. Bottled polyurethane foam is a polyurethane prepolymer, catalyst and gas propellant filled in a pressure-resistant iron aerosol can, also known as polyurethane foam sealant, which is a single-component, moisture-curing, multi-purpose polyurethane foam filling elastic sealing material. During construction, the aerosol colloid is sprayed to the construction site through a matching glue gun or manual spray pipe, and the foaming, bonding, molding and sealing processes are completed in a short period of time. In addition, it is easy to store and carry and easy to use, so it is widely used for filling and sealing of building door and window edge seams, component expansion joints and holes. Spray guns or spray pipes used with it have also come into being, and there are more and more styles of spray guns.

[0003] Common polyurethane foam sealant spray guns generally include a gun body with a handle, a one-way valve, a barrel and a gun nozzle, a pin and a slider assembly, a sealing device, a trigger, a return spring, and an opening adjustment device. A hole is provided at the upper end of the front half of the gun body, which is connected to a one-way valve adapted to the sealant bottle, and the pressurized foam agent enters the gun body through the one-way valve through the hole; the through hole at the front end of the gun body connects the barrel and the gun nozzle, and a sealing device is provided in the rear end through hole, and the pin passes through the center of the sealing device and is placed in the gun barrel, and the front end of the pin is tightly against the inner wall of the gun nozzle, forming a closed internal space in the front half of the gun body for the foam agent to flow. The rear half of the gun body is provided with a through hole for accommodating a slider and a return spring connected to the ejector pin. The return spring is compressed between the ejector pin slider and the opening adjustment device. The spring force reacts on the ejector pin slider to press the ejector pin against the inner wall of the gun nozzle, thereby sealing the gun nozzle. The middle part of the gun body is provided with a trigger that can control the foam agent entering the gun body to be sprayed out of the gun nozzle. The trigger is connected to the gun body pin, and the trigger rotates within a set range with the pin as the center of the circle. When in use, pull the trigger backward to move the ejector pin slider backward, and the ejector pin will immediately disengage from the inner wall of the gun nozzle, opening the passage for the foam agent to be sprayed, and the foam agent will be sprayed out through the inner hole of the gun nozzle. After use, release the trigger, and the ejector pin will reset under the action of the return spring, press against the inner wall of the gun nozzle again, close the spray passage of the foam agent, and the foam agent will immediately stop spraying out of the inner hole of the gun nozzle.

[0004] The spray gun with the above structure will cause the ejector to be linked when the trigger is accidentally triggered during construction, and then the ejector will be separated from the inner wall of the nozzle, causing the pressurized polyurethane foam to be accidentally sprayed out, causing personal injury, and posing a safety hazard. Although it has an ejector opening adjustment device that can be used to lock the ejector to prevent the foam from spraying out when the trigger is triggered, it is time-consuming and laborious to open or close the adjustment, which cannot meet the operator's requirements for convenient use of the spray gun. Summary of the invention

[0005] The purpose of the present invention is to solve the above technical problems and propose a spray gun that can be conveniently switched on and off.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0007] A spray gun capable of convenient on / off switching comprises a gun body, a gun nozzle, a trigger, an ejector pin and an ejector slider, wherein the trigger is rotatably connected to the gun body, the trigger is used to link the ejector slider, the ejector slider is used to link the ejector pin to open the gun nozzle, the gun body is provided with a limit gear, the inner side of the trigger is provided with a receiving cavity, the outer side surface is provided with a through hole penetrating the receiving cavity, an active switch with a pre-tightening device is provided in the receiving cavity and the through hole, the switch is kept normally open or normally closed by the pre-tightening device, thereby changing the relative position of the switch and the limit gear, and then opening or closing the linkage between the trigger and the ejector slider, thereby realizing convenient switching control of opening or closing the spray gun nozzle.

[0008] As a preferred solution, the pre-tightening device comprises an elastic member and a limiting member, and the elastic member is compressed and installed between the trigger and the switch through the limiting member.

[0009] As a preferred solution, the elastic member and the limiting member are arranged on the trigger, and a recess corresponding to the limiting member is provided on the switch to keep the position of the switch more stable when it is normally open or normally closed.

[0010] As a preferred embodiment, the switch is a combined sliding switch, including a push block and a locking block, the bottom of the locking block is located in the accommodating chamber of the trigger; a part of the push block is located on the outside of the trigger, and the other part passes through the through hole on the outer side of the trigger and is fixedly connected to the bottom of the locking block, and the locking block is driven by the push block to slide in the trigger accommodating chamber.

[0011] As a preferred embodiment, the push block is further provided with an operating part at one end of the outer side surface of the trigger, and an inwardly concave receiving groove for slidingly installing the operating part is provided on the outer side surface of the trigger, a first receiving hole for sequentially installing the elastic part and the limiting part is provided in the receiving groove, and a first recess and a second recess are provided on the side of the operating part opposite to the receiving groove; after the push block is fixedly connected to the locking block, the limiting part and the elastic part are confined between the push block and the trigger, and the operating part is pushed to link the push block and the locking block, so that the limiting part is elastically sunk into the first recess or the second recess to realize that the trigger is normally open or normally closed.

[0012] As a preferred solution, the push block and the locking block are fixedly connected by screws to facilitate their assembly.

[0013] As a preferred solution, the elastic member and the limiting member are arranged on the switch, and a recess corresponding to the limiting member is provided on the trigger to keep the position of the switch more stable when it is normally open or normally closed.

[0014] As a preferred embodiment, the switch is an integrated push button switch, including a pressing portion and a locking portion; the bottom of the locking portion is located in the accommodating cavity, and the top extends out of the accommodating cavity; the part of the pressing portion located in the accommodating cavity is provided with a circular through hole, and the button switch is hinged with the trigger by a cylindrical pin passing through the circular through hole; the pressing portion exposed on the outer side of the trigger through the through hole drives the switch to rotate in the accommodating cavity of the trigger, so that the top of the locking portion is against or disengaged from the limit stop of the gun body.

[0015] As a preferred embodiment, a third recess and a fourth recess are provided on the front wall of the accommodating chamber, a second accommodating hole parallel to the circular through hole is provided on the bottom of the locking portion, the second accommodating hole and the third recess and the fourth recess are arranged in the same circle with the circular through hole as the axis, and the elastic member and the limiting member are sequentially installed in the second accommodating hole; the pressing portion is moved to rotate in conjunction with the locking portion and drive the limiting member to elastically sink into the third recess or the fourth recess on the front wall of the accommodating chamber, so as to realize that the trigger is normally open or normally closed.

[0016] As a preferred solution, the elastic member is a compression spring or elastic rubber, and the limit member is a hard sphere or a cylinder with a convex curved surface, so as to reduce resistance and facilitate movement during the switch switching process.

[0017] Compared with the prior art, the beneficial technical effects of the present invention are:

[0018] (1) During use of the spray gun of the present invention, the switch is kept normally open or normally closed by the pre-tightening device, thereby changing the relative position of the switch and the limit gear, and then turning on or off the linkage between the trigger and the ejector slider, thereby realizing convenient switching control of opening or closing the spray gun nozzle, avoiding accidental spraying of polyurethane foam when the trigger is accidentally touched during construction, causing personal injury;

[0019] (2) The present invention has a simple structure and is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a structural schematic diagram of a trigger in a normally open position according to an embodiment of the present invention;

[0021] Figure 2 is a structural diagram of a trigger in a normally closed position according to an embodiment of the present invention;

[0022] Figure 3is an exploded schematic diagram of a trigger and a sliding switch according to an embodiment of the present invention;

[0023] Figure 4 is a schematic diagram of the back structure of the operating portion of a slide switch according to an embodiment of the present invention;

[0024] Figure 5 is an exploded schematic diagram of a trigger and a button switch according to a second embodiment of the present invention;

[0025] Figure 6 is a structural schematic diagram of a trigger in a normally open position in a second embodiment of the present invention;

[0026] Figure 7 yes Figure 6 AA section view;

[0027] Figure 8 is a structural schematic diagram of a trigger in a normally closed position in a second embodiment of the present invention;

[0028] Fig. 9 Schematic diagram of the structure of the third dimple and the fourth dimple of the second embodiment of the present invention;

[0029] Fig.10 yes Fig. 9 BB cross-sectional view.

[0030] In the figure, 1 is a gun body, 2 is a one-way valve, 3 is a gun barrel, 4 is a gun nozzle, 5 is a pin slide block, 6 is a sealing device, 7 is a trigger, 7 is a receiving groove, 7 is a receiving cavity, 7 is a first receiving hole, 7 is a through hole, 8 is a sliding switch, 8 is a push block, 8 is an operating part, 8 is a locking block, 8 is a first steel ball, 8 is a first compression spring, 8 is a first recess, 8 is a second recess, 8 is a screw, 9 is a push button switch, 9 is a pressing part, 9 is a locking part, 9 is a round through hole, 9 is a second receiving hole, 9 is a second steel ball, 9 is a second compression spring, 9 is a third recess, 9 is a fourth recess, 9 is a cylindrical pin, 10 is a first baffle, 11 is a second baffle, and 12 is an opening adjustment device. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with specific embodiments, but the protection scope of the present invention is not limited thereto.

[0032] Embodiment 1

[0033] like Figure 1-4As shown, the spray gun of this embodiment that can be conveniently switched on and off includes a gun body 1 with a grip, a one-way valve 2, a gun barrel 3 and a gun nozzle 4, an ejector pin and a slider assembly, a sealing device 6, a trigger 7, a return spring and an opening adjustment device 12. A hole is provided at the upper end of the front half of the gun body 1, and the hole is connected to the one-way valve 2 adapted to the caulking agent bottle, and the foam agent under pressure enters the gun body 1 through the one-way valve 2 through the hole; the through hole at the front end of the gun body 1 connects the gun barrel 3 and the gun nozzle 4, and a sealing device 6 is provided in the rear end through hole, and the ejector pin passes through the center of the sealing device 6 and is placed in the gun barrel 3, and the front end of the ejector pin is tightly against the inner wall of the gun nozzle 4, forming a closed internal space in the front half of the gun body 1 for the foam agent to flow. The rear half of the gun body 1 is provided with a through hole for accommodating a slider and a return spring connected to the ejector pin. The return spring is compressed between the ejector pin slider 5 and the opening adjustment device 12. The spring force reacts on the ejector pin slider 5 to push the ejector pin against the inner wall of the gun mouth 4, thereby sealing the gun mouth 4. The middle part of the gun body 1 is provided with a trigger 7 that can control the foam agent entering the gun body 1 to be sprayed out of the gun mouth 4. The trigger 7 is connected to the pin of the gun body 1, and the trigger 7 rotates within a set range with the pin as the center of the circle. When in use, the trigger 7 is pulled backward to move the ejector pin slider 5 backward, and the ejector pin is immediately disengaged from the inner wall of the gun mouth 4, opening the passage for the foam agent to be sprayed, and the foam agent is sprayed out through the inner hole of the gun mouth 4. After use, the trigger 7 is released, and the ejector pin is reset under the action of the return spring, and is pressed against the inner wall of the gun mouth 4 again, closing the spray passage of the foam agent, and the foam agent immediately stops spraying out of the inner hole of the gun mouth 4.

[0034] The gun body is provided with a limit gear, the inner side of the trigger 7 is provided with a receiving cavity 72, and the outer side is provided with a through hole 74 that penetrates the receiving cavity 72. An active switch with a pre-tightening device is provided in the receiving cavity 72 and the through hole 74. The switch is kept normally open or normally closed by the pre-tightening device, thereby changing the relative position of the switch and the limit gear, and then opening or closing the linkage between the trigger 7 and the ejector slider 5, so as to realize the convenient switching control of opening or closing the spray gun nozzle 4. During normal use, the switch is turned to the normally open position, and the use is no different from the existing spray gun. When not in use, the switch is turned to the normally closed position, and the limit gear restricts the trigger 7 from moving backward, thereby preventing the trigger 7 from driving the ejector slider 5 and the ejector linkage, which serves the purpose of safety protection and avoids the accidental spraying of the polyurethane foam agent when the trigger 7 is accidentally touched during construction, causing personal injury.

[0035] The preload device includes an elastic member and a limiter, and the elastic member is compressed and installed between the trigger 7 and the switch through the limiter. When the switch is in the normally open and normally closed positions, the limiter can limit the position of the switch to ensure that the position of the switch is more stable.

[0036] The elastic member and the limit member of this embodiment are arranged on the trigger, and a recess corresponding to the limit member is arranged on the switch, so as to keep the position of the switch more stable when it is normally open or normally closed. Specifically, the switch is a combined sliding switch 8, including a push block 81 and a locking block 82, and the bottom of the locking block 82 is located in the accommodating chamber 72 of the trigger 7. A part of the push block 81 is located outside the trigger 7, and the other part passes through the through hole 74 on the outer side of the trigger 7 and is fixedly connected to the bottom of the locking block 82. The locking block 82 is driven by the push block 81 to slide in the accommodating chamber 72 of the trigger 7. The push block 81 is further provided with an operating portion 811 at one end of the outer side surface of the trigger, and a concave receiving groove 71 for slidingly installing the operating portion 811 is provided on the outer side surface of the trigger. A first receiving hole 73 for sequentially installing an elastic member and a limiting member is provided in the receiving groove 71. A first recess 85 and a second recess 86 are provided on the side of the operating portion 811 opposite to the receiving groove 71. After the push block 81 is fixedly connected with the locking block 82, the limiting member and the elastic member are confined between the push block 81 and the trigger 7, and the operating portion 811 is pushed to link the push block 81 and the locking block 82, so that the limiting member is elastically sunk into the first recess 85 or the second recess 86 to realize that the trigger 7 is normally open or normally closed.

[0037] The first recess 85 and the second recess 86 are arranged along the vertical length direction of the operating portion 811, and the first recess 85 is located directly above the second recess 86. When the push block 81 is pushed to slide until the limiting member is sunken into the second recess 86, the top of the locking block 82 extends out of the accommodating cavity 72, corresponding to the normally closed state of the sliding switch 8. On the contrary, the limiting member is sunken into the first recess 85, and the top of the locking block 82 is retracted into the accommodating cavity 72, corresponding to the normally open state of the sliding switch 8. The first recess 85 and the second recess 86 are both shaped to match the limiting member, ensuring that the limiting member can be sunk therein. In this embodiment, the limiting member cooperates with the first recess 85 to ensure that the sliding switch 8 can remain stable even when it is in the normally open state without being subjected to a thrust; the limiting member cooperates with the second recess 86 to ensure that the sliding switch 8 can remain stable even when it is in the normally closed state without being subjected to a thrust.

[0038] The sliding switch 8 switches between the normally open and normally closed positions by moving up and down. The operating part 811 is driven up and down by an external force, driving the top of the locking block 82 to extend or retract into the accommodating chamber 72. The top of the locking block 82 extends out of the accommodating chamber 72 and fits with the limit gear and is located directly in front of the limit gear. At this time, the limit gear can just prevent the trigger 7 from being moved backward, so as to limit the trigger 7 from being linked to the ejector slider 5. The top of the locking block 82 retracts into the accommodating chamber 72 and deviates from the limit gear to release the restriction of the trigger 7 being linked to the ejector slider 5. The limit gear includes a first baffle 10. After the top of the locking block 82 extends out of the accommodating chamber 72, it fits with the end face of the first baffle 10 facing the gun nozzle 4, limiting the trigger 7 from being linked to the ejector slider 5. The push block 81 and the locking block 82 are fixedly connected by screws 87 to facilitate their assembly. The screws 87 can fully ensure the stability and reliability of the connection between the push block 81 and the locking block 82.

[0039] Specifically, the elastic member corresponding to the sliding switch 8 is a first compression spring 84, and the limiting member is a hard spherical first steel ball 83. The operating portion 811 moves up and down on the surface of the first steel ball 83, which can reduce the resistance during the switching process of the sliding switch 8. The elastic member corresponding to the sliding switch 8 can also be selected from elastic rubber, and the limiting member can also be selected from a column with a convex arc surface.

[0040] Embodiment 2

[0041] like Figure 5-10 As shown, the difference between this embodiment and the first embodiment is that the elastic member and the limit member are arranged on the switch, and the switch is an integrated button switch 9. A recess corresponding to the limit member is provided on the trigger 7 to keep the position of the switch more stable when it is normally open or normally closed. The button switch 9 includes a pressing portion 911 and a locking portion 912, the bottom of the locking portion 912 is located in the accommodating cavity, and the top extends out of the accommodating cavity. The part of the pressing portion 911 located in the accommodating cavity is provided with a round through hole 913, and the button switch 9 is hinged with the trigger 7 by a cylindrical pin 96 passing through the round through hole 913. The pressing portion 911 exposed on the outer side of the trigger 7 through the through hole drives the switch to rotate in the accommodating cavity of the trigger 7, so that the top of the locking portion 912 is against or separated from the limit stop of the gun body.

[0042] The part of the pressing part 911 outside the accommodating cavity is moved to rotate the pressing part 911, driving the top of the locking part 912 to rotate until it is in contact with the limit stop and is located directly in front of the limit stop. The top of the locking part 912 is in contact with the limit stop. At this time, the limit stop can just prevent the trigger 7 from being moved backward, so as to limit the trigger 7 from being linked to the ejector slider 5. The pressing part 911 is moved in the reverse direction, so that the top of the locking part 912 deviates from the limit stop, so as to release the restriction of the trigger 7 linking the ejector slider 5.

[0043] The front wall of the accommodating cavity is provided with a third recess 94 and a fourth recess 95, and the bottom of the locking portion 912 is provided with a second accommodating hole 914 parallel to the round through hole 913. The second accommodating hole 914 and the third recess 94 and the fourth recess 95 are arranged in the same circumference with the round through hole 913 as the axis. The second accommodating hole 914 is sequentially installed with an elastic member and a limit member; the pressing portion 911 is toggled to rotate the locking portion 912 in conjunction with the rotation and drive the limit member to elastically sink into the third recess 94 or the fourth recess 95 of the front wall of the accommodating cavity, so as to realize the normally open or normally closed state of the trigger 7. When the button switch 9 is toggled to sink the limit member into the third recess 94, the top of the locking portion 912 is in contact with the limit gear, corresponding to the normally closed state of the button switch 9. On the contrary, when the button switch 9 is toggled to sink the limit member into the fourth recess 95, the top of the locking portion 912 deviates from the limit gear, corresponding to the normally open state of the button switch 9. The third recess 94 and the fourth recess 95 are both shaped to match the limiting member, ensuring that the limiting member can sink into them. In this embodiment, the limiting member cooperates with the third recess 94 to ensure that the button switch 9 is stable even when it is in the normally closed state without being pushed; the limiting member cooperates with the fourth recess 95 to ensure that the button switch 9 is stable even when it is in the normally open state without being pushed.

[0044] The limit gear includes a second baffle 11, and the top of the locking portion 912 rotates to fit with an end face of the second baffle 11 facing the gun nozzle 4, limiting the trigger 7 from linking the ejector slider 5. The elastic member corresponding to the button switch 9 is a second compression spring 93, and the limit member is a second steel ball 92. The second compression spring 93 and the second steel ball 92 are sequentially installed in the second accommodating hole 914 at the bottom of the locking portion 912, and the second steel ball 92 rotates along the inner wall of the accommodating cavity, which can reduce the resistance during the switching process of the button switch 9. The elastic member corresponding to the button switch 9 can also be selected as elastic rubber, and the limit member can also be selected as a column with an outer convex arc surface.

[0045] The embodiments of the present invention are described in detail above. For those skilled in the art, according to the ideas provided by the present invention, there may be changes in the specific implementation methods, and these changes should also be regarded as the protection scope of the present invention.

Claims

1. A spray gun that can be conveniently switched on and off, comprising a gun body, a gun nozzle, a trigger, an ejector pin and an ejector pin slide block, wherein a through hole at the front end of the gun body connects a gun barrel and a gun nozzle, the ejector pin is placed in the gun barrel, and the front end of the ejector pin is tightly against the inner wall of the gun nozzle, forming a closed internal space in the front half of the gun body for the foaming agent to flow; the trigger is rotatably connected to the gun body, the trigger is used to link the ejector pin slide block, and the ejector pin slide block is used to link the ejector pin to open the gun nozzle, and the characteristics are: The gun body is provided with a limit gear, the inner side of the trigger is provided with a receiving cavity, the outer side is provided with a through hole that penetrates the receiving cavity, and an active switch with a pre-tightening device is provided in the receiving cavity and the through hole. The pre-tightening device keeps the switch normally open or normally closed, thereby changing the relative position of the switch and the limit gear, and then turning on or off the linkage between the trigger and the ejector slider, thereby realizing convenient switching control of opening or closing the nozzle of the spray gun; The pre-tightening device comprises an elastic member and a limiting member, wherein the elastic member is compressed and installed between the trigger and the switch through the limiting member; The elastic member and the limiting member are arranged on the trigger, and a recess corresponding to the limiting member is arranged on the switch to keep the position of the switch more stable when the switch is normally open or normally closed; The switch is a combined sliding switch, comprising a push block and a locking block, wherein the bottom of the locking block is located in the accommodating cavity of the trigger; a portion of the push block is located outside the trigger, and the other portion passes through the through hole on the outer side of the trigger and is fixedly connected to the bottom of the locking block; the locking block is driven by the push block to slide in the accommodating cavity of the trigger; The push block is also provided with an operating part at one end of the outer side of the trigger, and an inwardly concave receiving groove for slidingly installing the operating part is provided on the outer side of the trigger, and a first receiving hole for sequentially installing an elastic part and a limiting part is provided in the receiving groove; a first recess and a second recess are provided on the side of the operating part opposite to the receiving groove; after the push block is fixedly connected to the locking block, the limiting part and the elastic part are confined between the push block and the trigger, and the operating part is pushed to link the push block and the locking block, so that the limiting part is elastically sunk into the first recess or the second recess to realize that the trigger is normally open or normally closed.

2. The spray gun capable of convenient on / off switching according to claim 1, characterized in that: The push block and the locking block are fixedly connected by screws, which facilitates their assembly.

3. The spray gun capable of convenient on / off switching according to claim 1 or 2, characterized in that: The elastic member is a compression spring or elastic rubber, and the limiting member is a hard sphere or a column with an outer convex arc surface, so that the resistance is reduced during the switch switching process and the movement is facilitated.

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