Spray gun

Abstract

A spray gun, solving the problems of being prone to wear, misalignment, or even detachment caused by insufficient structural intensity of the mounting position of a trigger and a gun body due to the trigger being hinged to the outer wall surface of the gun body. The spray gun comprises a spray gun body; the spray gun body comprises a handle; a gun body is arranged on the upper portion of the handle; a gun needle is arranged in the gun body; a mounting space is formed in the gun body; a trigger is arranged in the mounting space; the trigger can move in the mounting space, and the portion of the trigger exposed downwards from the mounting space corresponds to the handle; the gun needle passes through a corresponding position of the trigger; an elastic valve set is arranged on the gun needle; and the portion of the trigger exposed downwards is pulled, and the gun needle is driven by means of the elastic valve set, so as to control a spray state of the spray gun. The trigger is provided in the gun body, and an opening of the bottom wall of the gun body provides a motion range for the trigger, so that a part of the structure of the trigger is covered and protected by the gun body, thereby increasing the structural intensity of the hinge position of the trigger, and preventing damage such as corrosion and wear caused by exposure of the trigger.

Description

A spray gun Technical Field

[0001] The invention belongs to the technical field of machinery and relates to a paint spray gun, in particular to a spray gun. Background Art

[0002] Spray gun is a kind of tool commonly used in industry, for example, it can be used for spraying paint onto the surface of various objects such as furniture, machinery and especially vehicles (corresponding car bodies). Spray gun can comprise a spray pot for accommodating spray material and a spray gun body for spraying paint material. The spray pot can be arranged on the upper side, lower side or lateral side of the spray gun. When the spray pot is arranged on the upper side, the spray gun is called a gravity spray gun, when the spray pot is on the lower side, it is a siphon or pressure-feed spray gun, and when the spray gun has a lateral spray pot, it is called a side spray pot spray gun. Instead of the spray pot, the spray gun can also comprise a hose connected to a pressure tank or a pump that supplies paint to the spray gun.

[0003] In the case of a gravity-fed spray gun, the paint flows in the direction of the nozzle due to gravity. In the case of a siphon or pressure-fed spray gun, or when the paint is supplied to the spray gun from a paint tank via a hose, the paint flows in the direction of the nozzle due to pressure. When the paint flows to the outside of the nozzle, the paint is atomized and blown forward. Here, a circular spray width that is essentially conical is formed. For many spraying and finishing jobs, flat spraying is preferred because larger surfaces can be sprayed in a shorter time. In addition, it allows for more uniform and efficient coating. For this reason, most spray guns have a compressed air distributor. Through the compressed air distributor, compressed air from the air supply is supplied to the air nozzle.

[0004] For example, Chinese patent document 201620911224.2 discloses a spray gun with one side completely closed and a spray gun body thereof, wherein the spray gun body (2) is provided with a needle accommodating chamber for accommodating a paint needle (42), and the spray gun body (2) is provided with a window (14) connected to the needle accommodating chamber, characterized in that: the window (14) is provided on one side of the left side or the right side of the spray gun body (2); the other side of the left side or the right side of the spray gun body (2) opposite to the window (14) is completely closed relative to the needle accommodating chamber. According to the utility model, one side of the spray gun body is completely closed to prevent dirt from entering, and the completely closed side of the spray gun body can be formed as a whole.

[0005] The aforementioned technical solutions employ a window in the sidewall of the gun body and hinge the trigger to the outer wall of the gun body, sometimes even using a single-arm trigger. This results in a relatively thin mounting position between the trigger and the gun body. Repeated triggering can easily lead to wear, misalignment, and even detachment of the hinged joint. This can negatively impact spray control and smooth operation, while in severe cases, the trigger can suddenly break during the spraying operation, causing the paint spray to abruptly stop or gush, resulting in uneven spraying. Furthermore, the external placement of the trigger prevents the trigger body from being shielded and protected, leaving it exposed to corrosion, wear, and other damage, shortening its service life. Summary of the Invention

[0006] The purpose of the present invention is to solve the above problems in the existing technology and to provide a spray gun in which the trigger part is arranged inside the gun body to improve the protection strength of the trigger.

[0007] The objectives of the present invention can be achieved through the following technical solutions: A spray gun, comprising a spray gun body, the spray gun body including a handle, a gun body provided on the upper part of the handle, a gun needle arranged in the gun body, an installation space provided in the gun body, a trigger provided in the installation space, the trigger being movable in the installation space, the portion of the trigger exposed downward from the installation space corresponding to the handle; the gun needle passing through the corresponding portion of the trigger, an elastic valve group being arranged on the gun needle, the portion of the trigger exposed downward being pulled, the gun needle being driven through the elastic valve group to control the spraying state of the spray gun.

[0008] In the above-mentioned spray gun, the above-mentioned installation space is a through hole that passes through the gun body, the corresponding part of the trigger passes through the gun body from the through hole, and the hinge point of the trigger is hinged to the corresponding part of the gun body.

[0009] In the above-mentioned spray gun, the trigger includes a hinged end located at the upper part and a free end located at the lower part, a bent connection portion is connected between the hinged end and the free end, and the free end is the portion of the trigger exposed downward.

[0010] In the above-mentioned spray gun, the top opening of the through-opening extends upward to form a hinge portion, and the hinge end is arranged in the hinge portion through a hinge shaft.

[0011] In the above-mentioned spray gun, the above-mentioned installation space is a groove cavity set in the gun body, the top side of the groove cavity has a groove wall, the bottom side of the groove cavity has a groove opening, the corresponding part of the trigger extends into the groove cavity from the groove opening, and the hinge point of the trigger is hinged to the corresponding part of the gun body.

[0012] In the above-mentioned spray gun, the trigger includes a hinged end 2 located at the upper part and a free end 2 located at the lower part, a straight line connection portion is connected between the hinged end 2 and the free end 2, the hinged end 2 is arranged in the groove cavity through a hinge shaft, and the free end 2 is the part of the trigger exposed downward.

[0013] In the above-mentioned spray gun, a gap is reserved between the downwardly exposed portion of the trigger and the maximum displacement and the installation space.

[0014] In the above-mentioned spray gun, an air inlet cavity and a branch air cavity are provided in the gun body, the connecting port between the air inlet cavity and the branch air cavity is the air inlet, and the gun needle passes through the air inlet cavity and the air inlet.

[0015] In the above-mentioned spray gun, the elastic valve group includes a sealing plug, a first spring and a blocking cover, the blocking cover seals the end of the air inlet chamber, the sealing plug is sleeved on the gun needle, the first spring is clamped between the sealing plug and the blocking cover, the sealing plug includes an integrally connected plug tube and a plug head, the port of the plug tube faces the trigger, and the plug head blocks the air inlet.

[0016] In the above-mentioned spray gun, a starting portion is provided on the gun needle, and a relative sliding hysteresis distance is formed between the sealing plug and the starting portion of the gun needle along the axial direction. The starting portion is an annular step provided on the outer periphery of the gun needle, and a second spring is provided between the annular step and the blocking cover; a threaded hole is provided on the blocking cover, and an adjusting knob is inserted into the threaded hole. The adjusting knob has a threaded rod, and the threaded rod is threadedly engaged with the threaded hole, and the inner end of the threaded rod faces the end of the gun needle.

[0017] Compared with the existing technology, this spray gun has the following beneficial effects:

[0018] 1. Enhanced Structural Strength and Protection: By moving the trigger from an external to an internal location within the gun body, the trigger is partially encased and protected, increasing the strength of the trigger's hinged joint while preventing damage from corrosion, wear, and other issues caused by the trigger's exposure. The trigger extends downward from the mounting hole, providing a range of motion and providing clearance to prevent contact with the edge of the mounting hole, thereby increasing its lifespan.

[0019] 2. Flexible Design and Structural Optimization: The trigger is connected to the corresponding part of the gun body through an articulated structure, achieving flexible rotation and increasing the trigger's stability. The through-hole creates a smooth structure at the top of the mounting hole, which facilitates the manufacturing process and makes it easier to create the mounting hole within the gun body.

[0020] 3. Gas Supply and Control System: The gun body is equipped with an air inlet chamber and a branch air chamber. High-pressure gas is supplied through the air inlet, achieving flow control between the main spray air path and the spray air path. The design of the elastic valve group realizes the control and suspension of high-pressure gas supply, improving the effect and accuracy of painting.

[0021] 4. Adjustment of the painting effect: A starting part is set on the gun needle, which forms a relative sliding hysteresis distance with the sealing plug. The gun needle moves back to open the painting port at the front end of the gun body through the compression of the second spring. The painting effect can be adjusted by adjusting the relative position of the starting part and the sealing plug.

[0022] 5. Easy operation and improved precision: Through the adjustment knob on the cover, the length of the threaded rod can be manually rotated to adjust the distance the trigger pushes the gun needle to move back, achieving precise control of the amount of paint sprayed.

[0023] Taking all the above effects into consideration, this spray gun has superior performance in structural design, protection mechanism, gas supply, and painting effect adjustment, providing a more stable, accurate and long-lasting solution for painting operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is an exploded three-dimensional structural diagram of the entire spray gun.

[0025] FIG2 is a partial exploded three-dimensional structural diagram of the spray gun.

[0026] FIG3 is a partial cross-sectional perspective structural diagram of the spray gun.

[0027] FIG4 is a second partial cross-sectional perspective structural diagram of the spray gun.

[0028] Figure 5 is a top view of the internal assembly structure of the spray gun.

[0029] FIG6 is a partial assembled three-dimensional structural diagram of the interior of the spray gun.

[0030] Figure 7 is a structural diagram of the overall appearance of the spray gun.

[0031] FIG8 is a cross-sectional view of the internal structure of another embodiment of the spray gun.

[0032] FIG9 is a structural diagram of the overall appearance of another embodiment of the spray gun.

[0033] In the figure, 1. gun body; 1a. installation space; 1a1. through-hole; 1a2. hinged part; 1a3. groove cavity; 1b. air inlet cavity; 1c. air distribution cavity; 1d. main injection air path; 1e. spray air path; 2. handle; 3. gun needle; 3a. starting part; 4. trigger; 4a. through-hole; 5. hinged shaft; 6. sealing plug; 6a. plug tube; 6b. plug head; 7. first spring; 8. second spring; 9. blocking cover; 10. adjusting knob. DETAILED DESCRIPTION

[0034] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0035] In some embodiments, as shown in Figures 1, 3 and 7, the spray gun has a spray gun body, which includes a handle 2, a gun body 1 is provided on the upper part of the handle 2, a gun needle 3 is arranged in the gun body 1, an installation space 1a is provided in the gun body 1, a trigger 4 is provided in the installation space 1a, the trigger 4 can move in the installation space 1a, and the part of the trigger 4 exposed downward from the installation space 1a corresponds to the handle 2; the gun needle 3 passes through the corresponding part of the trigger 4, and an elastic valve group is arranged on the gun needle 3. When the trigger 4 is pulled, the part exposed downward drives the gun needle 3 through the elastic valve group to control the spraying state of the spray gun.

[0036] By converting the trigger 4 from an external setting to an internal setting of the gun body 1, at least part of the structure of the trigger 4 is covered by the gun body 1 to form protection, and at the same time, the strength structure of the hinge position of the trigger 4 is increased, so that pulling the trigger 4 ensures the effectiveness and stability of activating the elastic valve group and the gun needle 3, further increasing the service life of the trigger 4.

[0037] As shown in Figures 1, 3, and 4, mounting space 1a is a through-hole 1a1 extending through gun body 1. The corresponding portion of trigger 4 passes through gun body 1 through through-hole 1a1, and the trigger 4 is hingedly connected to a corresponding portion of gun body 1. Through-hole 1a1 creates a clear structure for mounting space 1a at the top of gun body 1. This facilitates demolding during the injection molding process of gun body 1 to form mounting space 1a within gun body 1.

[0038] As shown in Figures 1 to 3 and 6, the trigger 4 includes a hinged end at the upper part and a free end at the lower part, a bent connection portion is connected between the hinged end and the free end, and the free end is the portion of the trigger 4 exposed downward.

[0039] The top of the through-portion 1a1 extends upward to form a hinged portion 1a2, with the hinged end 1 disposed within the hinged portion 1a2 via a hinge axis 5. As shown in Figures 1 to 3 and 6, the trigger 4 is specifically a bent plate, with the hinged portion 1a2 located at the rear end of the through-portion 1a1, away from the nozzle of the gun body 1. Consequently, the hinge axis 5 is located on the upper side of the gun body 1 and away from the nozzle. The bent rear end opening of the trigger 4 is sleeved onto the hinge axis 5, forming a hinge point, allowing the trigger 4 to swing rearward about the hinge point to press the elastic valve assembly and the needle 3.

[0040] As shown in Figures 3 to 5 , the downwardly exposed portion of trigger 4 moves to a position where there is a gap between its maximum displacement and mounting space 1a. The free end of trigger 4 forms the triggering force application position, providing a range of motion for trigger 4 through mounting space 1a. Even when trigger 4 reaches its maximum pull position, it does not contact the edge of mounting space 1a. This prevents the specifications of mounting space 1a from limiting the movement of trigger 4 and affecting the maximum degree of spray opening. It also prevents the edge of mounting space 1a from rubbing against trigger 4 and causing damage.

[0041] A through-hole 4a is provided in the middle of the trigger 4, through which the needle 3 passes, leaving a gap between the needle 3 and the through-hole 4a. When the trigger 4 is rotated, the through-hole 4a moves relative to the needle 3, but does not contact the needle 3. This prevents the trigger 4 from interfering with the needle 3, and the through-hole 4a creates a clearance for the needle 3.

[0042] As shown in Figures 1, 2 and 6, the trigger 4 forms a physical connection above the through-port 4a, that is, there is a physical isolation between the through-port 4a and the top opening, thereby increasing the structural strength of the trigger 4 and facilitating the triggering action.

[0043] As shown in Figure 5, the gun body 1 is provided with an air inlet chamber 1b and a branch air chamber 1c. The connection between the air inlet chamber 1b and the branch air chamber 1c is the air inlet, and the gun needle 3 extends through the air inlet chamber 1b and the air inlet. High-pressure gas enters the gun body and fills the air inlet chamber 1b. It then passes through the air inlet and reaches the branch air chamber 1c. The branch air chamber 1c then divides the air into two air supply branches: one is the main injection air path 1d, and the other is the spray air path 1e.

[0044] As shown in Figures 1, 2 and 5, the elastic valve group includes a sealing plug 6, a first spring 7 and a blocking cover 9. The blocking cover 9 blocks the end of the air inlet chamber 1b. The sealing plug 6 is sleeved on the gun needle 3. The first spring 7 is clamped between the sealing plug 6 and the blocking cover 9. The sealing plug 6 includes an integrally connected plug tube 6a and a plug head 6b. The end of the plug tube 6a faces the trigger 4, and the plug head 6b blocks the air inlet.

[0045] When the trigger 4 swings backward, it first contacts and presses the plug tube 6a, simultaneously moving the plug head 6b backward to open the air inlet. High-pressure gas instantly flows from the air inlet chamber 1b into the air distribution chamber 1c. At this time, the first spring 7 is in a compressed state. When the trigger 4 is released, the elastic force of the first spring 7 pushes the sealing plug 6 forward to reset it, causing the plug head 6b to reseal the air inlet and stop the high-pressure gas supply.

[0046] As shown in Figures 1, 2, 5 and 6, a starting portion 3a is provided on the gun needle 3, and a relative sliding hysteresis distance is formed between the sealing plug 6 and the starting portion 3a of the gun needle 3 along the axial direction. The starting portion 3a is an annular step provided on the outer periphery of the gun needle 3, and a second spring 8 is provided between the annular step and the blocking cover 9.

[0047] When the trigger 4 continues to push the sealing plug 6 backward, the sealing plug 6 moves a distance along the gun needle 3. The plug head 6b contacts and pushes the annular step, which simultaneously compresses the second spring 8, thereby driving the gun needle 3 backward to open the paint spray port at the front end of the gun body 1, achieving the paint spraying effect. When the trigger 4 is released, the elastic force of the second spring 8 pushes the annular step forward to reset, causing the gun needle 3 to re-seal the paint spray port and stop the paint spraying operation.

[0048] The blocking cover 9 is provided with a threaded hole, into which an adjusting knob 10 is inserted. The adjusting knob 10 has a threaded rod, which is threadedly engaged with the threaded hole, and the inner end of the threaded rod faces the end of the gun needle 3 .

[0049] By manually rotating the adjustment knob 10, the length of the threaded rod extending into the threaded hole is adjusted by thread engagement, that is, the distance between the inner end of the threaded rod and the end of the gun needle 3 is regulated. The trigger 4 pushes the gun needle 3 backward through the sealing plug 6 until it presses against the inner end of the threaded rod, and the gun needle 3 stops. In this way, the distance between the threaded rod and the gun needle 3 is shortened, the backward movement of the gun needle 3 is shortened, the gap between the front end of the gun needle 3 and the paint spraying port is shortened, and the amount of paint sprayed is reduced. The distance between the threaded rod and the gun needle 3 is lengthened, the backward movement of the gun needle 3 is lengthened, the gap between the front end of the gun needle 3 and the paint spraying port is longer, and the amount of paint sprayed is increased.

[0050] In a further optimized embodiment, as shown in Figures 8 and 9, the installation space 1a is a groove cavity 1a3 set in the gun body 1, the top side of the groove cavity 1a3 has a groove wall, and the bottom side of the groove cavity 1a3 has a notch. The corresponding part of the trigger 4 extends into the groove cavity 1a3 from the notch, and the hinge point of the trigger 4 is hinged to the corresponding part of the gun body 1.

[0051] As shown in Figure 8, the trigger 4 includes a hinged end 2 at the upper part and a free end 2 at the lower part. A straight line connection portion is connected between the hinged end 2 and the free end 2. The hinged end 2 is arranged in the groove cavity 1a3 through the hinge shaft 5, and the free end 2 is the part of the trigger 4 exposed downward.

[0052] The trigger 4 is roughly in the shape of a straight plate, and the hinge shaft 5 is set at the front end of the groove cavity 1a3 close to the nozzle of the gun body 1. As a result, the hinge shaft 5 is located inside the gun body 1 and close to the nozzle of the gun body 1. The top opening of the trigger 4 is sleeved on the hinge shaft 5, so that the trigger 4 swings backward around the hinge point to push the elastic valve group and the gun needle 3.

[0053] As shown in FIG8 , the upper body of the trigger 4 is formed of two parallel plates, the space between the two plates forms a through hole 4 a for avoiding the needle 3 , and the top opening is formed along the same axis through the two plates, thereby reducing the weight of the trigger 4 .

[0054] The working principle of this spray gun:

[0055] When the trigger 4 is pulled and swung backward, it first contacts and presses the plug tube 6a, synchronously driving the plug head 6b backward to open the air inlet. High-pressure gas instantly enters the air distribution chamber 1c from the air inlet chamber 1b, at which point only the first spring 7 is compressed. The trigger 4 continues to push the sealing plug 6 backward, causing it to move a distance back along the gun needle 3. The plug head 6b contacts and presses the annular step, which begins to compress the second spring 8, driving the gun needle 3 backward to open the paint spray port at the front end of the gun body 1. The high-pressure gas from the main air path 1d sprays the paint forward, while the high-pressure gas from the spray air path 1e drives the paint to form a circular area covering the spray, achieving the painting effect.

[0056] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which the invention pertains may make various modifications or additions to the described specific embodiments or substitute them in a similar manner, but will not deviate from the spirit of the invention or exceed the defined scope. Although the invention has been described and described in detail in the accompanying drawings and the foregoing description, such illustrations and descriptions are considered to be illustrative or exemplary rather than restrictive. It should be understood that within the scope of the following claims, changes and modifications may be made by those of ordinary skill in the art. Specifically, the present invention encompasses additional embodiments having any combination of features from the different embodiments described above. With respect to the use of the expression "generally" or "substantially", this patent application should be understood to disclose features and values ​​that also fully satisfy these features and values, i.e., without the aforementioned characterization as "generally" or "substantially".

[0057] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

Claims

1. A spray gun having a spray gun body, the spray gun body including a handle, a gun body being provided on the upper part of the handle, and a gun needle being arranged in the gun body, characterized in that, An installation space is provided inside the gun body. A trigger is provided inside the installation space. The trigger can move inside the installation space. The part of the trigger that protrudes downward from the installation space corresponds to the handle. The needle passes through the corresponding position of the trigger. An elastic valve group is arranged on the needle. Pressing the part of the trigger that protrudes downward drives the needle through the elastic valve group to control the spraying state of the spray gun.

2. The spray gun according to claim 1, wherein, The above-mentioned installation space is a through hole penetrating the gun body. The corresponding position of the trigger passes through the gun body from the through hole, and the hinge point of the trigger is hinged at the corresponding position of the gun body.

3. The spray gun according to claim 2, wherein The trigger includes a first hinge end located at the upper part and a first free end located at the lower part. A bent connecting part is connected between the first hinge end and the first free end. The first free end is the part of the trigger that protrudes downward.

4. The spray gun according to claim 3, wherein The top opening of the through hole extends upward to form a hinge part. The first hinge end is arranged inside the hinge part through a hinge shaft.

5. The spray gun according to claim 1, wherein, The above-mentioned installation space is a cavity provided inside the gun body. The top side of the cavity has a cavity wall, and the bottom side of the cavity has a cavity opening. The corresponding position of the trigger extends into the cavity from the cavity opening, and the hinge point of the trigger is hinged at the corresponding position of the gun body.

6. The spray gun according to claim 5, characterized in that, The trigger includes a second hinge end located at the upper part and a second free end located at the lower part. A straight connecting part is connected between the second hinge end and the second free end. The second hinge end is arranged inside the cavity through a hinge shaft. The second free end is the part of the trigger that protrudes downward.

7. The spray gun according to claim 1, characterized in that, A gap is reserved between the part of the trigger that protrudes downward when it moves to the maximum displacement and the installation space.

8. The spray gun according to claim 1, wherein, An air inlet cavity and a gas distribution cavity are provided inside the gun body. The connection port between the air inlet cavity and the gas distribution cavity is an air inlet. The needle penetrates through the air inlet cavity and the air inlet.

9. The spray gun according to claim 8, wherein The elastic valve group includes a sealing plug, a first spring, and a retaining cap. The retaining cap seals the end of the air inlet cavity. The sealing plug is sleeved on the needle. The first spring is clamped between the sealing plug and the retaining cap. The sealing plug includes a plug tube and a plug head connected integrally. The port of the plug tube faces the trigger, and the plug head blocks the air inlet.

10. The spray gun according to claim 9, characterized in that, A starting part is provided on the needle. A lag distance for relative sliding is formed between the sealing plug and the starting part of the needle along the axial direction. The starting part is an annular step provided on the outer periphery of the needle. A second spring is provided between the annular step and the retaining cap. A threaded hole is provided on the retaining cap. An adjusting knob is inserted into the threaded hole. The adjusting knob has a threaded rod. The threaded rod forms a threaded meshing connection with the threaded hole. The inner end of the threaded rod faces the end of the needle.

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