A foaming gun with a flow regulating mechanism

Abstract

The utility model relates to foaming gun technical field, more particularly in, with flow regulation mechanism's foaming gun. Foaming gun includes the gun body, and the front end of gun body is connected with the front gun barrel that stretches, and the rear end of gun body is fixed with the support pipe, and the trigger is hinged on the gun body, and the front end of support pipe stretches to the trigger direction, and the needle bar sets up in the gun barrel, and the trigger is connected with needle bar transmission, and flow regulation mechanism includes the adjusting wheel, and the adjusting wheel is screwed on the support pipe, and the adjusting wheel is used for and the trigger is limited to the limit trigger angle of trigger and is limited to the limit trigger angle of trigger, and is equipped with the elastic damping part in the adjusting wheel, and is equipped with the concave-convex structure on the support pipe, and the elastic damping part and the concave-convex structure are in contact, and the elastic damping part is used for increasing the circumferential friction of adjusting wheel rotation and provides the operation feedback. The utility model provides a kind of stable damping, enhances operation feedback and improves the flow regulation mechanism of the reliability of foaming gun, to improve the performance and user experience of foaming gun.

Description

Technical Field

[0001] This utility model relates to the field of foam gun technology, and more specifically, to a foam gun with a flow adjustment mechanism. Background Technology

[0002] Foam guns are commonly used tools for foam plastic construction. They spray foaming agents to seal gaps or fill gaps, and are widely used in building insulation, door and window sealing and other fields.

[0003] The flow rate adjustment mechanism is one of the core functional components of a foam gun, mainly used to adjust the output flow rate of the foaming material to adapt to the requirements of different construction scenarios for foam thickness and density. Currently, flow rate adjustment in foam guns typically relies on the threaded engagement of an adjustment wheel and a support tube. The adjustment wheel is screwed onto the external thread at the front end of the support tube via its internal thread. Rotating the adjustment wheel changes its extreme contact position with the trigger, thereby limiting the stroke of the needle rod and achieving the purpose of adjusting the foaming flow rate.

[0004] However, existing flow regulation mechanisms have the following drawbacks: First, the regulating wheel and support pipe are only connected by ordinary threads, lacking an effective damping structure. When rotating the regulating wheel, slippage can easily occur due to thread clearance or surface smoothness issues. Operators find it difficult to accurately perceive the adjustment range and force, leading to inaccurate foam flow control, resulting in foam overflow waste or incomplete foaming, affecting construction quality. Second, during long-term use, friction between the threaded pairs can easily lead to wear, further exacerbating the instability of the adjustment, and even causing the regulating wheel to loosen or the limit switch to fail, resulting in the trigger failing to reset properly or flow control going out of control. Third, due to the lack of damping feedback, operators lack clear tactile guidance during adjustment. In scenarios requiring fine adjustment, it is difficult to achieve precise flow matching, reducing operational efficiency and product consistency. Utility Model Content

[0005] The problem solved by this invention is to provide a flow regulation mechanism for a foam gun that provides stable damping, enhanced operational feedback, and improved adjustment reliability, thereby improving the performance of the foam gun and the user experience.

[0006] To solve the above problems, this utility model adopts the following technical solution: a foaming gun with a flow adjustment mechanism, the foaming gun includes a gun body, a forward-extending gun barrel connected to the front end of the gun body, a support tube fixed to the rear end of the gun body, a trigger hinged to the gun body, the front end of the support tube extending towards the trigger, a needle rod disposed inside the gun barrel, the rear end of the needle rod elastically supported on the support tube, the trigger being drivenly connected to the needle rod, the flow adjustment mechanism including an adjustment wheel, an external thread provided on the outer circumferential surface of the front end of the support tube, an internal thread provided on the inner circumferential surface of the adjustment wheel, the adjustment wheel being threadedly connected to the front end of the support tube, the front end of the adjustment wheel being used to abut against the trigger to limit the limit angle of the trigger; an elastic damping element is provided inside the adjustment wheel, and several concave and convex structures are provided on the outer circumferential surface of the support tube, the elastic damping element abuts against the concave and convex structures, the axial length of the concave and convex structures on the support tube being greater than the axial adjustment distance of the adjustment wheel on the support tube; the elastic damping element is used to increase the circumferential friction force when the adjustment wheel rotates and to provide operational feedback.

[0007] Compared with existing technologies, the technical effects achieved by this solution are as follows: When using the foam gun, the user adjusts the flow rate of the foaming agent by adjusting the adjusting wheel. In the flow adjustment mechanism of this foam gun, an elastic damping element is incorporated that engages with the concave-convex structure on the outer circumference of the support tube. During the rotation of the adjusting wheel, the elastic damping element continuously contacts the concave-convex structure, increasing the circumferential friction of the adjusting wheel. This increased friction not only prevents the adjusting wheel from shifting due to equipment vibration or unintentional contact, ensuring the long-term stability of the foaming agent flow rate, but also provides clear feedback to the operator. Specifically, when the user needs to control the flow rate of the foaming agent according to construction requirements, rotating the adjusting wheel changes its contact position with the trigger via threaded transmission, thereby limiting the trigger stroke and the opening of the needle bar. The elastic damping element in this invention makes this adjustment process smoother, more controllable, and more precise. Users can set the flow rate to the desired level using the elastic damping element and the grooves on the barrel during adjustment, avoiding flow fluctuations caused by slippage of the adjusting wheel, thus ensuring the uniformity and consistency of the foaming agent spraying. Furthermore, because the axial length of the groove structure on the support tube is greater than the adjustment stroke of the adjusting wheel, the damping effect is maintained throughout the entire adjustment range, improving the reliability and durability of the mechanism at different operating points.

[0008] Furthermore, the concave-convex structure is arranged on the rear side of the external thread on the support tube, and the elastic damping element is arranged towards the rear end of the adjusting wheel.

[0009] Compared with existing technologies, the technical effects achieved by this solution are as follows: By arranging the concave-convex structure on the rear side of the external thread on the support tube and offsetting the elastic damping element towards the rear end of the adjusting wheel, effective isolation is achieved between the damping point and the thread adjustment area, avoiding interference with damping stability from minor gaps or vibrations generated during thread engagement. In the specific application of foam gun flow adjustment, when the operator rotates the adjusting wheel to change the trigger's limit angle, the elastic damping element always maintains uniform contact with the concave-convex structure, thus providing continuous and consistent friction for the rotation of the adjusting wheel.

[0010] Furthermore, the concave-convex structure includes several strip-shaped protrusions, which are evenly distributed in the circumferential direction of the support tube.

[0011] Compared with existing technologies, the technical effects achieved by this solution are as follows: First, when the operator rotates the adjustment wheel, the elastic damping element slides sequentially over each evenly distributed tooth. This circumferentially distributed tooth design ensures that the radial reaction force on the elastic damping element remains essentially consistent regardless of the angle of the adjustment wheel during rotation. Users can experience a clear and uniform tactile feedback when rotating the adjustment wheel, with identical feedback force for each adjustment, improving the smoothness and consistency of the adjustment feel. Second, the uniform damping force distribution prevents the adjustment wheel from loosening or jamming at specific angles, enhancing the stability and reliability of the mechanism.

[0012] Furthermore, the concave-convex structure includes several strip-shaped grooves, and the grooves and protrusions are distributed sequentially in the circumferential direction of the support tube. The groove width and the protrusion tooth width are the same.

[0013] Compared to existing technologies, this technical solution achieves the following effects: When the operator rotates the adjusting wheel, the elastic damping element slides sequentially over the crests of the protruding teeth and the troughs of the grooves. Since the grooves and protruding teeth have the same width, this means that the time interval between the elastic damping element being in a compressed state (contact with the protruding teeth) and a relaxed state (opposite to the grooves) within a unit rotation angle is uniform and symmetrical. In other words, when adjusting the adjusting wheel, the equal width and alternating distribution of the grooves and protruding teeth ensures that the damping force exhibits regular, small fluctuations during rotation, rather than abrupt, sudden changes. This design provides the operator with clear and rhythmic tactile feedback, improving control precision and the user experience when adjusting the adjusting wheel.

[0014] Furthermore, the support tube is hollow, with an open front end and a blind rear end. A return spring is installed inside the rear end of the support tube, with its two ends acting on the support tube and the needle rod, respectively.

[0015] Compared with existing technologies, the technical effects achieved by this solution are as follows: the return spring operates within a closed support cavity, avoiding external interference and ensuring that the direction and magnitude of the return force it applies to the needle bar are constant, thereby guaranteeing the high repeatability and accuracy of needle bar return and flow control.

[0016] Furthermore, a protruding convexity is formed on the rear end side of the needle bar, and a washer is axially fixedly sleeved on the opposite sides of the convexity. The front end of the return spring abuts against the rear washer. A transmission sleeve is sleeved on the needle bar. The rear end of the transmission sleeve is used to abut against the front washer, and the front end of the transmission sleeve is used to abut against the trigger.

[0017] Compared with existing technologies, the technical effects achieved by this solution are as follows: When the trigger is pulled, the trigger pushes the transmission sleeve forward, and the rear end of the transmission sleeve then pushes the front washer, thereby driving the entire needle bar to move forward against the elastic force of the return spring through the protrusion, opening the flow channel. After the trigger is released, under the action of the return spring, the needle bar is pushed back by the rear washer, achieving reset and closure.

[0018] Furthermore, the elastic damping element includes a compression spring and an abutment. One end of the compression spring is connected to the first side tooth, and the other end is connected to the abutment, which abuts against the barrel. When the abutment abuts against the barrel, the compression spring provides a preload.

[0019] Compared with existing technologies, the technical effects achieved by this solution are as follows: First, when the adjusting wheel rotates on the support tube, the elastic damping component needs to maintain stable contact with the concave-convex structure to provide uniform frictional damping and a clear sense of gear shifting. The compression spring provides a continuous and elastically adjustable preload to the abutment component, ensuring that the abutment component always abuts against the barrel with appropriate pressure. The preload of the compression spring can be precisely designed and adjusted to provide the operator with a rotational damping that is both clearly perceptible and not too strenuous. This design produces a comfortable "click" feel for gear shifting, enhancing the product's quality and human-machine interface experience. Second, the elastic characteristics of the compression spring allow it to absorb and compensate for unavoidable dimensional deviations during parts processing and assembly, as well as wear generated during use. This ensures that the operating feel of the adjusting wheel remains consistent throughout its service life, avoiding the problem of damping force gradually diminishing or completely disappearing due to wear, thus improving the reliability of the foam gun and the consistency of the user experience.

[0020] Furthermore, the elastic damping component is also equipped with a positioning stud. The elastic damping component is fixed inside the adjusting wheel by the positioning stud. The positioning stud is located on the upper side of the compression spring, and is used to compress the compression spring during installation.

[0021] Compared with existing technologies, the technical effects achieved by this solution are as follows: A positioning stud is added to the elastic damping component, and this stud is used to fix the entire elastic damping component inside the adjusting wheel. The positioning stud is positioned above the compression spring, and the spring is pre-compressed by tightening the positioning stud during installation. Firstly, the positioning stud firmly locks the elastic damping component in a designated position inside the adjusting wheel, preventing it from loosening during operation. Secondly, by controlling the screw-in depth of the positioning stud, the compression amount of the spring can be precisely controlled, thus achieving fine-tuning of the damping force. Thirdly, utilizing the self-locking characteristic of the threaded connection, the positioning stud provides a stable mechanical lock for the elastic damping component, ensuring the stability and reliability of both the adjusting wheel and the elastic damping component.

[0022] Furthermore, the connecting element is a sphere.

[0023] Compared with existing technologies, the technical effects achieved by this solution are as follows: First, the ball provides gentle and clear operational feedback when rolling on the uneven structure, eliminating the dry friction noise of traditional structures; Second, even if there are slight scratches or tilts on the surface of the uneven structure, the ball can still maintain stable contact, reducing the dependence on the machining accuracy of the parts. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a foaming gun with a flow adjustment mechanism according to an embodiment of the present invention; Figure 2 This is a partial cross-sectional view of a foaming gun with a flow regulating mechanism according to an embodiment of the present utility model. Figure 3 for Figure 1 A longitudinal sectional view.

[0025] Explanation of reference numerals in the attached drawings: 1-Gun body; 2-Gun barrel; 3-Support tube; 4-Trigger; 5-Pin bar; 6-Adjusting wheel; 7-External thread; 8-Internal thread; 9-Elastic damping element; 10-Concave-convex structure; 13-Return spring; 14-Protrusion; 15-Washer; 16-Transmission sleeve; 17-Compression spring; 18-Abutment element; 19-Positioning stud. Detailed Implementation

[0026] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0027] See Figures 1-3To solve the above problems, this utility model adopts the following technical solution: a foaming gun with a flow adjustment mechanism, the foaming gun includes a gun body 1, a forward-extending gun barrel 2 connected to the front end of the gun body 1, a support tube 3 fixed to the rear end of the gun body 1, a trigger 4 hinged to the gun body 1, the front end of the support tube 3 extending towards the trigger 4, a needle rod 5 disposed inside the gun barrel 2, the rear end of the needle rod 5 elastically supported on the support tube 3, the trigger 4 being drively connected to the needle rod 5, the flow adjustment mechanism including an adjusting wheel 6, an external thread 7 provided on the outer circumferential surface of the front end of the support tube 3, the adjusting wheel 6... The inner circumferential surface is provided with an internal thread 8, and the adjusting wheel 6 is threadedly connected to the front end of the support tube 3. The front end of the adjusting wheel 6 is used to abut against the trigger 4 to limit the extreme angle of the trigger 4. An elastic damping element 9 is provided inside the adjusting wheel 6, and several concave and convex structures 10 are provided on the outer circumferential surface of the support tube 3. The elastic damping element 9 abuts against the concave and convex structures 10, and the axial length of the concave and convex structures 10 on the support tube 3 is greater than the axial adjustment distance of the adjusting wheel 6 on the support tube 3. The elastic damping element 9 is used to increase the circumferential friction force when the adjusting wheel 6 rotates and to provide operation feedback.

[0028] When using the foam gun, the user adjusts the flow rate of the foaming agent by adjusting the adjusting wheel 6. In the flow adjustment mechanism of this foam gun, an elastic damping element 9 is incorporated that engages with the concave-convex structure 10 on the outer circumference of the support tube 3. During the rotation of the adjusting wheel 6, the elastic damping element 9 continuously contacts the concave-convex structure 10, increasing the circumferential friction of the adjusting wheel 6. This increased friction not only prevents the adjusting wheel 6 from shifting due to equipment vibration or unintentional contact, ensuring the long-term stability of the foaming agent flow rate, but also provides clear feedback to the operator.

[0029] Specifically, when the user needs to control the flow rate of the foaming agent according to construction requirements, rotating the adjusting wheel 6 changes its contact position with the trigger 4 through threaded transmission, thereby limiting the stroke of the trigger 4 and the opening of the needle bar 5. The elastic damping element 9 in this invention makes this adjustment process smoother, more controllable, and more precise. The user can set the flow rate to the desired level using the elastic damping element 9 and the concave-convex structure on the barrel 2 during adjustment, avoiding flow fluctuations caused by the slippage of the adjusting wheel 6, thus ensuring the uniformity and consistency of the foaming agent spraying. Furthermore, since the axial length of the concave-convex structure 10 on the support tube 3 is greater than the adjustment stroke of the adjusting wheel 6, the damping effect is maintained throughout the entire adjustment range, improving the reliability and durability of the mechanism at different working points.

[0030] Specifically, see Figure 2 The concave-convex structure 10 is arranged on the rear side of the external thread 7 on the support tube 3, and the elastic damping element 9 is arranged biased towards the rear end position of the adjusting wheel 6.

[0031] By arranging the concave-convex structure 10 on the rear side of the external thread 7 on the support tube 3, and by positioning the elastic damping element 9 biased towards the rear end of the adjusting wheel 6, effective isolation between the damping point and the thread adjustment area is achieved, avoiding interference with damping stability from minor gaps or vibrations generated during thread engagement. In conjunction with the specific application of the foam gun flow adjustment, when the operator rotates the adjusting wheel 6 to change the limit angle of the trigger 4, the elastic damping element 9 always maintains uniform contact with the concave-convex structure 10, thereby providing continuous and consistent friction for the rotation of the adjusting wheel 6.

[0032] Specifically, see Figure 2 and Figure 3 The concave-convex structure 10 includes several strip-shaped protrusions evenly distributed around the circumference of the support tube 3. Firstly, when the operator rotates the adjusting wheel 6, the elastic damping element 9 slides sequentially over each evenly distributed protrusion. This circumferentially distributed protrusion design ensures that the radial reaction force on the elastic damping element 9 remains essentially consistent regardless of the angle position of the adjusting wheel 6 during rotation. Users can feel a clear and uniform tactile feedback when rotating the adjusting wheel 6, with each adjustment providing the same feedback force, improving the smoothness and consistency of the adjustment feel. Secondly, the uniform damping force distribution prevents the adjusting wheel 6 from becoming loose or jammed at specific angles, enhancing the stability and reliability of the mechanism.

[0033] For example, the concave-convex structure 10 is composed of several equally spaced parallel strip-shaped protrusions, and the axial extension direction of the protrusions is parallel to the axis of the support tube 3.

[0034] Alternatively, the concave-convex structure 10 adopts a hemispherical protrusion array, with the protrusions arranged in a close hexagonal pattern. The spherical abutment 18 forms point contact with the hemispherical protrusions, producing a continuous slight clicking sound when the adjusting wheel 6 rotates.

[0035] Specifically, see Figure 2 and Figure 3 The concave-convex structure 10 includes several strip-shaped grooves, and the grooves and protrusions are distributed in sequence in the circumferential direction of the support tube 3. The groove width and the protrusion width are the same.

[0036] For example, the groove and the tooth are shaped to match, and the groove depth and the tooth width are the same.

[0037] When the operator rotates the adjusting wheel 6, the elastic damping element 9 slides sequentially over the crests of the protruding teeth and the troughs of the grooves. Since the grooves and protruding teeth have the same width, this means that the time interval between the elastic damping element 9 being in a compressed state (contact with the protruding teeth) and a relaxed state (opposite to the grooves) per unit rotation angle is uniform and symmetrical. In other words, when adjusting the adjusting wheel 6, the equal width and alternating distribution of the grooves and protruding teeth ensures that the damping force of the adjusting wheel 6 exhibits regular, small fluctuations during rotation, rather than abrupt, jump-like changes. This design provides the operator with clear and rhythmic tactile feedback, improving the control precision and user experience when adjusting the adjusting wheel 6.

[0038] Specifically, see Figure 2 and Figure 3 The support tube 3 is hollow, with an open front end and a blind rear end. A return spring 13 is installed inside the rear end of the support tube 3, with its two ends acting on the support tube 3 and the needle bar 5, respectively. The return spring 13 operates within the closed cavity of the support tube 3, avoiding external interference and ensuring that the direction and magnitude of the return force it applies to the needle bar 5 are constant, thereby guaranteeing the high repeatability and accuracy of the needle bar 5's return and flow control.

[0039] For example, see Figure 2 and Figure 3 The support tube 3 has an external thread 7 machined on its outer circumferential surface at the front end, and an annular concave-convex structure 10 is provided behind it. A threaded structure for connection and fixation to the gun body 1 is also provided on the rear side of the concave-convex structure 10. The nominal diameter of the external thread 7 is less than or equal to the nominal diameter of the threaded structure. The support tube 3 also has a countersunk hole. The support tube 3 is fixed to the gun body 1 by studs to ensure that the support tube 3 can be installed inside the gun body 1. Furthermore, as illustrated again, the support tube 3 can be fixed to the gun body 1 by interference fit, snap-fit, or other methods.

[0040] Specifically, a protruding convex body 14 is formed on the rear end side of the needle bar 5. A gasket 15 is axially fixedly sleeved on the opposite sides of the convex body 14. The front end of the return spring 13 abuts against the gasket 15 on the rear side. A transmission sleeve 16 is sleeved on the needle bar 5. The rear end of the transmission sleeve 16 is used to abut against the gasket 15 on the front side, and the front end of the transmission sleeve 16 is used to abut against the trigger 4.

[0041] For example, when the operator pulls trigger 4, trigger 4 pushes the transmission sleeve 16 forward. The rear end of the transmission sleeve 16 then pushes the front washer 15, thereby driving the entire needle bar 5 forward through the protrusion 14, overcoming the elastic force of the return spring 13, opening the foaming agent flow channel. The foaming gun has an adapter hole above it for connecting the foaming agent. The limit stroke of trigger 4 is determined by the front end position of the adjusting wheel 6. After releasing trigger 4, under the action of the return spring 13, the needle bar 5 is pushed back through the rear washer 15, achieving reset and closure.

[0042] When flow adjustment is required, the adjusting wheel 6 is rotated. The adjusting wheel 6 has an external threaded structure. The user rotates the adjusting wheel 6 through this external thread, causing it to move axially on the support tube 3 via the threaded joint. This changes its initial contact point with the trigger 4, limiting the maximum actuation angle of the trigger 4 and the maximum opening of the needle bar 5. During the rotation of the adjusting wheel 6, the abutment 18 of the elastic damping element 9 slides sequentially over the crests and troughs of the circumferentially distributed concave-convex structure 10 on the support tube 3. The compression spring 17 ensures a continuous and stable contact pressure between the abutment 18 and the concave-convex structure 10.

[0043] Specifically, the elastic damping element 9 includes a compression spring 17 and an abutment 18. One end of the compression spring 17 is connected to the first side tooth, and the other end is connected to the abutment 18. The abutment 18 abuts against the barrel 2. When the abutment 18 abuts against the barrel 2, the compression spring 17 provides a preload.

[0044] For example, the compression spring 17 and the abutment 18 can be either an integral part or two separate parts.

[0045] To illustrate again, the abutment 18 can be configured as a conical cylinder, with the surface in contact with the concave-convex structure 10 configured as a gently sloping arc surface, ensuring that the abutment 18 will not be damaged during use.

[0046] Firstly, when the adjusting wheel 6 rotates on the support tube 3, the elastic damping element 9 needs to maintain stable contact with the concave-convex structure 10 to provide uniform frictional damping and a clear sense of gear shifting. The compression spring 17 provides a continuous and elastically adjustable preload to the abutment 18, ensuring that the abutment 18 always abuts against the barrel 2 with appropriate pressure. The preload of the compression spring 17 can be precisely designed and adjusted to provide the operator with a rotational damping that is both clearly perceptible and not too strenuous. This design produces a comfortable "click" feel for gear shifting, enhancing the product's quality and human-machine interface experience. Secondly, the elastic characteristics of the compression spring 17 allow it to absorb and compensate for unavoidable dimensional deviations during parts processing and assembly, as well as wear generated during use. This ensures that the operating feel of the adjusting wheel 6 remains consistent throughout its service life, avoiding the problem of damping force gradually diminishing or completely disappearing due to wear, thus improving the reliability of the foam gun and the consistency of the user experience.

[0047] Specifically, see Figure 2 and Figure 3The elastic damping element 9 is also equipped with a positioning stud 19. The elastic damping element 9 is fixed inside the adjusting wheel 6 by the positioning stud 19. The positioning stud 19 is located on the upper side of the compression spring 17, and is used to compress the compression spring 17 during installation. The addition of the positioning stud 19 to the elastic damping element 9 and the use of the positioning stud 19 to fix the entire elastic damping element 9 inside the adjusting wheel 6, and the positioning stud 19 being located on the upper side of the compression spring 17, pre-compresses the compression spring 17 by tightening the positioning stud 19 during installation. Firstly, the positioning stud 19 firmly locks the elastic damping element 9 in a designated position inside the adjusting wheel 6, preventing the elastic damping element 9 from loosening during operation within the adjusting wheel 6. Secondly, by controlling the screw depth of the positioning stud 19, the amount of compression on the compression spring 17 can be precisely controlled, thereby achieving fine adjustment of the damping force. Thirdly, by utilizing the self-locking characteristic of the threaded connection, the positioning stud 19 can provide a stable mechanical lock for the elastic damping element 9, ensuring the stability and reliability of the adjusting wheel 6 and the elastic damping element 9.

[0048] Specifically, see Figure 2 and Figure 3 The connecting part 18 is a sphere.

[0049] First, the ball provides gentle and clear operational feedback when rolling on the uneven structure 10, eliminating the dry friction noise of traditional structures. Second, even if there are slight scratches or tilts on the surface of the uneven structure 10, the ball can still maintain stable contact, reducing the dependence on the machining accuracy of the parts.

[0050] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A foaming gun with a flow rate adjustment mechanism, the foaming gun comprising a gun body, a forward-extending gun barrel connected to the front end of the gun body, a support tube fixed to the rear end of the gun body, a trigger hinged to the gun body, the front end of the support tube extending toward the trigger, a needle rod disposed inside the gun barrel, the rear end of the needle rod elastically supported on the support tube, the trigger being inducedly connected to the needle rod, the flow rate adjustment mechanism comprising an adjustment wheel, an external thread provided on the outer circumferential surface of the front end of the support tube, an internal thread provided on the inner circumferential surface of the adjustment wheel, the adjustment wheel being threadedly connected to the front end of the support tube, the front end of the adjustment wheel being used to abut against the trigger to limit the ultimate angle of trigger operation, characterized in that... An elastic damping element is provided inside the adjusting wheel, and several concave and convex structures are provided on the outer circumferential surface of the support tube. The elastic damping element abuts against the concave and convex structures, and the axial length of the concave and convex structures on the support tube is greater than the axial adjustment distance of the adjusting wheel on the support tube. The elastic damping element is used to increase the circumferential friction force when the adjusting wheel rotates and to provide operational feedback.

2. The foam gun according to claim 1, characterized in that, The concave-convex structure is arranged on the rear side of the external thread on the support tube, and the elastic damping element is arranged biased towards the rear end position of the adjusting wheel.

3. The foam gun according to claim 2, characterized in that, The concave-convex structure includes several strip-shaped protrusions, which are evenly distributed in the circumferential direction of the support tube.

4. The foam gun according to claim 3, characterized in that, The concave-convex structure includes several strip-shaped grooves, and the grooves and protrusions are distributed sequentially in the circumferential direction of the support tube. The groove width and the protrusion width are the same.

5. The foam gun according to any one of claims 1-4, characterized in that, The support tube is hollow, with an open front end and a blind rear end. A return spring is provided inside the rear end of the support tube, with its two ends acting on the support tube and the needle rod, respectively.

6. The foam gun according to claim 5, characterized in that, A protruding convexity is formed on the rear end side of the needle bar, and a washer is axially fixedly sleeved on the opposite sides of the convexity. The front end of the return spring abuts against the rear washer. A transmission sleeve is sleeved on the needle bar. The rear end of the transmission sleeve is used to abut against the front washer, and the front end of the transmission sleeve is used to abut against the trigger.

7. The foam gun according to claim 6, characterized in that, The elastic damping element includes a compression spring and an abutment, one end of the compression spring is connected to a first side tooth, and the other end is connected to the abutment, which abuts against the barrel. When the abutment is against the barrel, the compression spring provides a preload.

8. The foam gun according to claim 7, characterized in that, The elastic damping element is also provided with a positioning stud. The elastic damping element is fixed inside the adjusting wheel by the positioning stud. The positioning stud is located on the upper side of the compression spring and is used to compress the compression spring during installation.

9. The foam gun according to claim 7, characterized in that, The abutment is a sphere.

Images