A C-type laser spot welding gun device with a clamping mechanism

Abstract

This invention proposes a C-type laser spot welding gun device with a clamping mechanism, relating to the field of spot welding gun technology. It includes a frame, a laser head, a gun head, and an air knife. The laser head is fixedly mounted within the frame. Two mounting holes are formed on the periphery of the gun head, symmetrically arranged about the center line of the gun head. The air knife includes a first air knife and a second air knife, which are respectively fixedly mounted within the two mounting holes. The second air knife is located on the side of the first air knife away from the frame, and its output end is inclined towards the side closer to the first air knife. By separately mounting the first and second air knives within the two mounting holes and coordinating the air curtains generated by the first and second air knives, this invention can block impurities from different directions, providing comprehensive protection for the laser head and laser path, thereby ensuring the safe operation of the spot welding gun.

Description

Technical Field

[0001] This invention relates to the field of spot welding gun technology, and more particularly to a C-type laser spot welding gun device with a clamping mechanism. Background Technology

[0002] A laser spot welding gun is a tool that uses a laser beam as a heat source to heat and spot weld tiny areas of a material. It has excellent characteristics such as fast welding speed, deep and narrow welds, and accurate positioning, and is widely used in the welding and processing of automotive parts and precision components.

[0003] Utility model CN215545793U discloses a welding nozzle for multi-functional protection of laser welding guns, comprising, from top to bottom, a connecting mounting plate, an upper air knife body, a lower connecting seat, a lower air knife body, an air knife tongue, an air knife cover, and a barrier plate; a first air connector is connected to the side of the upper air knife body, and two shielding gas connectors are symmetrically connected to the side of the lower connecting seat; a second air connector is connected to the side of the lower air knife body. This utility model, by setting two shielding gas paths on both sides of the nozzle, allows for separate ejection of gas through the welding nozzle, providing good protection for the area where the weld has just solidified; simultaneously, two air paths are ejected through the airflow channel in the center of the nozzle, forming a gas protective layer to protect the laser welding machine lens. This nozzle ensures welding stability, prevents lens contamination, thereby guaranteeing welding stability and improving welding efficiency.

[0004] In the above technical solution, in order to protect the laser welding machine lens, a first air connector and a second air connector are set up to form two gas protective layers inside the nozzle. However, the two gas protective layers are independent of each other and can only be used to block impurities from below the nozzle, but cannot effectively deal with impurities from the side of the nozzle. Summary of the Invention

[0005] In view of this, the present invention proposes a C-type laser spot welding gun device with a clamping mechanism, which improves the protective performance of the air curtain and ensures the safe operation of the spot welding gun.

[0006] The technical solution of this invention is implemented as follows: This invention provides a C-type laser spot welding gun device with a clamping mechanism, comprising a frame, a laser head, a gun head, and an air knife, wherein,

[0007] The laser head is fixedly mounted inside the frame;

[0008] The gun head is fixedly mounted on the frame and coaxially mounted with the laser head. Two mounting holes are provided on the periphery of the gun head, and the two mounting holes are symmetrically arranged about the center line of the gun head.

[0009] The air knife includes a first air knife and a second air knife, which are respectively fixedly installed in the two mounting holes. The first air knife is located in the mounting hole on the side closer to the frame, and its output end is perpendicular to the axis of the gun head. The second air knife is located on the side of the first air knife away from the frame, and its output end is tilted towards the side closer to the first air knife, so that the air curtain generated by the second air knife intersects with the first air knife or the air curtain generated by the first air knife.

[0010] Based on the above technical solutions, preferably, the flow velocity of the air curtain generated by the first air knife is greater than the flow velocity of the air curtain generated by the second air knife.

[0011] The angle between the axis of the output end of the second air knife and the axis of the mounting hole is θ, and 90°≥arctan[2(ya) / (x+d)]≥θ≥arctan[(ya) / x]≥0, where x is the inner diameter of the gun head along the axis of the mounting hole, y is the length of the mounting hole along the axis of the gun head, a is the distance between the second air knife and the end of the mounting hole away from the frame, and d is the outer diameter of the laser emitted by the laser head at the first air knife.

[0012] More preferably, the first air knife and the second air knife are provided with threaded holes, and the side wall of the mounting hole is provided with multiple connecting holes. The threaded holes are fixedly connected to one of the connecting holes by screws, so as to adjust the fixed position and fixed angle of the first air knife and the second air knife.

[0013] Based on the above technical solutions, preferably, the frame includes a housing and a linear module, wherein,

[0014] The gun head is fixedly mounted on the housing;

[0015] The linear module is fixedly installed inside the housing, and the laser head is fixedly installed on the output end of the linear module.

[0016] More preferably, the linear module includes a lead screw and a slide block, wherein,

[0017] The lead screw is rotatably mounted inside the housing;

[0018] The slide block is slidably disposed within the housing and is connected to the lead screw via a threaded connection, and the laser head is fixedly disposed on the slide block.

[0019] More preferably, the frame further includes a pointer that passes through and slides on the housing and is fixedly connected to the slide block.

[0020] More preferably, the frame also includes a viewing window, which is detachably fixed to the housing.

[0021] Based on the above technical solutions, preferably, it also includes a boom and a drive cylinder, wherein...

[0022] One end of the boom is slidably mounted on the frame, and the other end is located on the side of the gun head away from the frame;

[0023] The drive cylinder is fixedly mounted on the frame, and its output end is fixedly connected to the boom.

[0024] More preferably, it also includes air tubes, which are respectively fixedly disposed on the periphery of the gun head at one end away from the frame and on the boom at one end away from the frame;

[0025] The gun head is provided with two air tubes, and the two air tubes on the gun head are symmetrically arranged about the axis of the gun head.

[0026] Based on the above technical solutions, preferably, the end of the gun head away from the frame is duckbill shaped, and multiple heat dissipation holes are opened on the periphery of the end of the gun head away from the frame.

[0027] The C-type laser spot welding gun device with a clamping mechanism of the present invention has the following advantages over the prior art:

[0028] (1) By setting the first air knife and the second air knife in two mounting holes respectively, and allowing the air curtain generated by the first air knife to cooperate with the air curtain generated by the second air knife, impurities from different directions can be blocked, and the laser head and laser path can be fully protected, thereby ensuring the safe operation of this spot welding gun.

[0029] (2) By setting up a boom, the back of the workpiece can be supported, so that the distance between the workpiece and the gun head remains unchanged. By setting up a drive cylinder, the distance between the boom and the gun head can be adjusted to adapt to different workpieces.

[0030] (3) By setting the linear module, the position of the laser head can be adjusted to control the position of the laser beam focus on the workpiece, so that this spot welding gun can be adapted to different processing conditions;

[0031] (4) By setting up a gas pipe and utilizing its connection with an inert protective gas, the workpiece and weld can be protected, thereby further improving the welding quality of the workpiece. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a perspective view of a C-type laser spot welding gun device with a clamping mechanism according to the present invention;

[0034] Figure 2 This is a perspective view of the gun head in a C-type laser spot welding gun device with a clamping mechanism according to the present invention;

[0035] Figure 3 This is a cross-sectional view of the air knife in a C-type laser spot welding gun device with a clamping mechanism according to the present invention, when the second air knife is in the first position;

[0036] Figure 4 This is a cross-sectional view of the air knife in a C-type laser spot welding gun device with a clamping mechanism according to the present invention, when the second air knife is in the second position;

[0037] Figure 5 This is an exploded view of the mounting hole in a C-type laser spot welding gun device with a clamping mechanism according to the present invention.

[0038] Figure 6 This is a perspective view of the linear module in a C-type laser spot welding gun device with a clamping mechanism according to the present invention.

[0039] Figure 7 This is a perspective view of the pointer in a C-type laser spot welding gun device with a clamping mechanism according to the present invention;

[0040] Figure 8 This is a perspective view of the drive cylinder in a C-type laser spot welding gun device with a clamping mechanism according to the present invention.

[0041] Figure 9 This is a partial perspective view of the boom in a C-type laser spot welding gun device with a clamping mechanism according to the present invention.

[0042] The components are as follows: 1. Frame; 11. Housing; 12. Linear module; 121. Lead screw; 122. Slide; 13. Pointer; 14. Viewing window; 2. Laser head; 3. Gun head; 301. Mounting hole; 302. Heat dissipation hole; 303. Connection hole; 4. Air knife; 41. First air knife; 42. Second air knife; 401. Threaded hole; 5. Boom; 6. Drive cylinder; 7. Air pipe. Detailed Implementation

[0043] The technical solutions of this invention will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0044] like Figure 1-9 As shown, a C-type laser spot welding gun device with a clamping mechanism according to the present invention includes a frame 1, a laser head 2, a gun head 3, an air knife 4, a boom 5, a drive cylinder 6, and an air pipe 7.

[0045] Laser head 2 is the core component of the welding equipment. It is responsible for emitting a laser beam and using optical elements to focus the laser beam onto the welding area of ​​the workpiece. The laser beam energy is highly concentrated, which can quickly melt the material and form a weld, thereby achieving precise welding of the workpiece.

[0046] The frame 1 is used to support and protect the laser head 2. It is a hollow frame structure. The laser head 2 is fixedly installed inside the frame 1. The gun head 3 is used to protect the path of the laser beam. The gun head 3 is also fixedly installed on the frame 1. The gun head 3 is a tubular structure, and its center line coincides with the axis of the laser beam emitted by the laser head 2.

[0047] A flange plate is fixedly installed on the frame 1 for connecting and fixing with a robotic arm capable of three-dimensional movement, thereby driving the laser beam to move to different welding positions. The laser head 2 adopts the existing swing laser head technology, which can realize various welding shapes such as spiral, straight, and ∞, thereby meeting different types of welding needs.

[0048] The gun head 3 also has the effect of protecting the weld. A gas pipe 7 is fixed through the end of the gun head 3 away from the frame 1. After the gas pipe 7 is connected to the inert gas, the inert gas flow is continuously input into the gun head 3. The inert gas flow passes through the gun head 3 and is then sprayed to the welding area. This can prevent the molten pool and high-temperature area from reacting with oxygen in the air to form oxides during the welding process, thus ensuring the welding quality. At the same time, the inert gas flow can also carry away the heat on the gun head 3, which has a certain cooling effect.

[0049] Laser head 2 consists of many optical components and is easily damaged. The welding environment is harsh and contains various impurities. Therefore, an air knife 4 is installed to protect laser head 2. Figure 2 and Figure 3As shown, two mounting holes 301 are opened on the periphery of the gun head 3, and the two mounting holes 301 are symmetrically arranged about the center line of the gun head 3. The air knife 4 includes a first air knife 41 and a second air knife 42. The first air knife 41 and the second air knife 42 are both fixedly installed in the mounting holes 301. When the first air knife 41 and the second air knife 42 are connected to the high-pressure air, two air curtains will be formed. The two air curtains are two protective barriers for the laser head 2, reducing the damage of external impurities to the laser head 2.

[0050] The arrangement of the first air knife 41 and the second air knife 42 can be adjusted according to the usage requirements. For example, the first air knife 41 and the second air knife 42 can be installed in the same mounting hole 301, or the first air knife 41 and the second air knife 42 can be fixedly installed in two different mounting holes 301, and the two can be spaced apart along the axial direction of the gun head 3, so that the first air knife 41 and the second air knife 42 generate two parallel or inclined but non-intersecting air curtains. When impurities enter the gun head 3 at the end away from the frame 1, the two air curtains can block the impurities and prevent the impurities from hitting the laser head 2.

[0051] To install the first air knife 41 and the second air knife 42 and ensure smooth airflow in the air curtain, the inner diameter of the mounting hole 301 needs to be increased. However, this would cause impurities on the side of the gun head 3 to enter the gun head 3 along the edge of the mounting hole 301, damaging the laser head 2. To solve this problem, the first air knife 41 and the second air knife 42 are fixedly installed in the two mounting holes 301 respectively, with the first air knife 41 located on the side of the mounting hole 301 closer to the frame 1, and its output end perpendicular to the axis of the gun head 3. This creates an air curtain in the gun head 3 above the mounting hole 301, effectively preventing impurities entering through the mounting hole 301 from contacting the laser head 2.

[0052] At the same time, position the second air knife 42 on the side of the first air knife 41 away from the frame 1, and tilt the output end of the second air knife 42 towards the side closer to the first air knife 41, so that the air curtain generated by the second air knife 42 intersects with the first air knife 41 or the air curtain generated by the first air knife 41, such as... Figure 3 As shown, this structure not only creates two barriers for impurities coming from below the gun head 3, but also creates two barriers for impurities coming from the right mounting hole 301. Although there is only one barrier for impurities coming from the left mounting hole 301, a C-shaped flow cavity is formed between the two air curtains, which can accelerate the discharge of impurities and thus improve the protection of the laser head 2.

[0053] To ensure the effectiveness of the two air curtains, the flow rate of the air curtain generated by the first air knife 41 should be greater than that of the air curtain generated by the second air knife 42, and even the former should be 3-5 times that of the latter, so as to avoid the problem that the air curtain generated by the first air knife 41 cannot pass through the air curtain generated by the second air knife 42 when the two air curtains intersect.

[0054] When the first air knife 41 and the second air knife 42 are installed in the same mounting hole 301 and the two air curtains are parallel, a large number of impurities will pass through the two mounting holes 301 along the flow direction of the airflow in the air curtain. When the first air knife 41 and the second air knife 42 are installed in two mounting holes 301 respectively and the two air curtains are parallel, the impurities entering between the first air knife 41 and the second air knife 42 will rotate and remain between them. Both of these situations will increase the probability of impurities passing through the mounting hole 301, causing the impurities to flow through the irradiation path of the laser beam, and causing the energy of the laser beam irradiating the workpiece to be lost.

[0055] The intersection of the air curtain generated by the second air knife 42 with the air curtain generated by the first air knife 41 or the air curtain generated by the first air knife 41 can also reduce the obstruction of the laser beam by impurities. For example Figure 3 and Figure 4 As shown, at this time, the second air knife 42 rotates to the first position and the second position respectively. Impurities from the right mounting hole 301 can only enter the laser path below the air curtain generated by the second air knife 42, but cannot enter the laser path above the air curtain generated by the second air knife 42. Impurities from the left mounting hole 301 can be quickly discharged from the gun head 3 by the C-shaped flow cavity between the two air curtains. When the second air knife 42 rotates between the first position and the second position, the above effect can be guaranteed.

[0056] Assume the angle between the axis of the output end of the second air knife 42 and the axis of the mounting hole 301 is θ, the inner diameter of the gun head 3 along the axis of the mounting hole 301 is x, the length of the mounting hole 301 along the axis of the gun head 3 is y, the distance between the second air knife 42 and the end of the mounting hole 301 away from the frame 1 is a, and the outer diameter of the laser head 2 emitting laser at the first air knife 41 is d. Without considering ideal conditions such as the thickness of the air curtain and the specifications of the air knife 4, in the first position, θ = arctan[2(ya) / (x+d)], and in the second position, θ = arctan[(ya) / x], that is, when 90°≥arctan[2(ya) / (x+d)]≥θ≥arctan[(ya) / x]≥0, it can prevent impurities from the right mounting hole 301 from entering the laser path above the air curtain generated by the second air knife 42. Although this limit is derived under ideal conditions, if realistic factors are considered, the actual rotation range of θ will be greater than this limit range. Therefore, this limit range is also reliable.

[0057] like Figure 3As shown, this structural design provides better protection against impurities from the right mounting hole 301. Therefore, in practical applications, the right mounting hole 301 can be oriented towards a relatively harsh environment, or the number of air knives 4 can be increased to protect against impurities from the left mounting hole 301.

[0058] When performing welding processes under different working conditions, it is necessary to adjust the installation position and angle of the first air knife 41 and the second air knife 42. To improve the ease of adjustment, such as Figure 5 As shown, threaded holes 401 are made on the first air knife 41 and the second air knife 42, and multiple connecting holes 303 are made on the side wall inside the mounting hole 301. The threaded holes 401 are fixedly connected to one of the connecting holes 303 by screws. The fixed position of the first air knife 41 and the second air knife 42 can be adjusted by selecting different positions of the connecting holes 303. The fixed angle of the first air knife 41 and the second air knife 42 can be adjusted by loosening and tightening the screws.

[0059] like Figure 1 As shown, the frame 1 includes a housing 11, a linear module 12, a pointer 13, and a viewing window 14. The gun head 3 is fixedly mounted on the housing 11, the linear module 12 is fixedly mounted inside the housing 11, and the laser head 2 is fixedly mounted on the output end of the linear module 12 to drive the laser head 2 to move along a straight line, adjust the position of the laser beam focus generated by the laser head 2 on the workpiece, and achieve different welding requirements.

[0060] In a preferred embodiment, the linear module 12 includes a lead screw 121 and a slide block 122, such as... Figure 6 As shown, the lead screw 121 is rotatably mounted inside the housing 11, and the slide block 122 is slidably mounted inside the housing 11 and is connected to the lead screw 121 by a threaded connection. The laser head 2 is fixedly mounted on the slide block 122. When the lead screw 121 is rotated, the slide block 122 and the laser head 2 can slide along a straight line. Of course, in order to facilitate the rotation of the lead screw 121, a handwheel can be installed on the lead screw 121.

[0061] like Figure 6 and Figure 7 As shown, the pointer 13 is slidably mounted on the housing 11 and is fixedly connected to the slide block 122, so that the pointer 13 can move with the laser head 2. The pointer 13 is used to indicate the position of the laser head 2. In order to indicate the position of the laser head 2 in numerical form, a scale that cooperates with the pointer 13 can be set on the outside of the housing 11.

[0062] like Figure 1As shown, the viewing window 14 is fixedly mounted on the housing 11. The internal condition of the housing 11 can be observed in a timely manner through the viewing window 14. At the same time, the viewing window 14 is detachably connected to the housing 11, and the laser head 2 can be maintained by removing the viewing window 14, thus improving its maintenance convenience.

[0063] One end of the boom 5 is located on the side of the torch head 3 away from the frame 1, used to support the side of the workpiece away from the laser head 2, keeping the distance between the workpiece and the laser head 2 constant and improving the uniformity of welding; such as Figure 8 As shown, the other end of the boom 5 is slidably mounted on the frame 1 and is fixedly connected to the output end of the drive cylinder 6, which is fixedly mounted on the frame 1. Thus, the distance between the boom 5 and the laser head 2 can be adjusted by controlling the extension and retraction of the drive cylinder 6, making this spot welding gun suitable for different working conditions.

[0064] This spot welding gun is typically used for welding aluminum workpieces, such as... Figure 9 As shown, a copper block structure is installed on the end of the boom 5 near the workpiece, which makes it less likely to stick to the aluminum workpiece, thereby further improving the welding quality of this spot welding gun.

[0065] In order to improve the welding quality of this spot welding gun, an air pipe 7 is also fixedly installed on the end of the boom 5 away from the frame 1 to blow an inert gas flow toward the side of the workpiece away from the laser head 2.

[0066] To ensure adequate protection of the weld seam on the side of the workpiece closest to laser head 2, such as... Figure 2 As shown, the gun head 3 is provided with two air tubes 7, and the two air tubes 7 on the gun head 3 are symmetrically arranged about the axis of the gun head 3, and the end of the gun head 3 away from the frame 1 is set in the shape of a duckbill.

[0067] The welding process generates a lot of heat. In order to dissipate heat from this device, such as... Figure 2 As shown, multiple heat dissipation holes 302 are provided on the periphery of the end of the gun head 3 away from the frame 1, and the multiple heat dissipation holes 302 are preferably arranged in a circular array around the center line of the gun head 3.

[0068] The method of using the C-type laser spot welding gun device with a clamping mechanism of the present invention is as follows:

[0069] First, install the air knife 4 in the appropriate position within the mounting hole 301. Then, install the frame 1 on the robotic arm. Connect the laser head 2 and the drive cylinder 6 to the control device. Connect the air knife 4 and the air pipe 7 to the corresponding air circuits. Next, adjust the positions of the laser head 2 and the boom 5 by rotating the lead screw 121 and controlling the drive cylinder 6. Finally, use the robotic arm to move the spot welding gun to the welding position of the workpiece and start the laser head 2 to perform welding.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A C-type laser spot welding gun device with a clamping mechanism, characterized in that: It includes a frame (1), a laser head (2), a gun head (3), and an air blade (4), among which, The laser head (2) is fixedly installed inside the frame (1); The gun head (3) is fixedly mounted on the frame (1) and coaxially mounted with the laser head (2). Two mounting holes (301) are opened on the periphery of the gun head (3), and the two mounting holes (301) are symmetrically arranged about the center line of the gun head (3). The air knife (4) includes a first air knife (41) and a second air knife (42). The first air knife (41) and the second air knife (42) are respectively fixedly installed in the two mounting holes (301). The first air knife (41) is located in the mounting hole (301) on the side close to the frame (1), and its output end is perpendicular to the axis of the gun head (3). The second air knife (42) is located on the side of the first air knife (41) away from the frame (1), and its output end is tilted towards the side close to the first air knife (41), so that the air curtain generated by the second air knife (42) intersects with the air curtain generated by the first air knife (41) or the air curtain generated by the first air knife (41). The airflow velocity generated by the first air knife (41) is greater than that generated by the second air knife (42); The angle between the axis of the output end of the second air knife (42) and the axis of the mounting hole (301) is θ, and 90°≥arctan[2(ya) / (x+d)]≥θ≥arctan[(ya) / x]≥0, where x is the inner diameter of the gun head (3) along the axis of the mounting hole (301), y is the length of the mounting hole (301) along the axis of the gun head (3), a is the distance between the second air knife (42) and the end of the mounting hole (301) away from the frame (1), and d is the outer diameter of the laser emitted by the laser head (2) at the first air knife (41).

2. The C-type laser spot welding gun device with a clamping mechanism as described in claim 1, characterized in that: The first air knife (41) and the second air knife (42) are provided with threaded holes (401), and a plurality of connecting holes (303) are provided on the side wall inside the mounting hole (301). The threaded hole (401) and one of the connecting holes (303) are fixedly connected by screws to adjust the fixed position and fixed angle of the first air knife (41) and the second air knife (42).

3. The C-type laser spot welding gun device with a clamping mechanism as described in claim 1, characterized in that: The frame (1) includes a housing (11) and a linear module (12), wherein, The gun head (3) is fixedly mounted on the housing (11); The linear module (12) is fixedly installed inside the housing (11), and the laser head (2) is fixedly installed on the output end of the linear module (12).

4. The C-type laser spot welding gun device with a clamping mechanism as described in claim 3, characterized in that: The linear module (12) includes a lead screw (121) and a slide (122), wherein, The lead screw (121) is rotatably disposed within the housing (11); The slide block (122) is slidably disposed inside the housing (11) and is connected to the lead screw (121) by a threaded engagement, and the laser head (2) is fixedly disposed on the slide block (122).

5. The C-type laser spot welding gun device with a clamping mechanism as described in claim 4, characterized in that: The frame (1) also includes a pointer (13), which is slidably disposed on the housing (11) and fixedly connected to the slide (122).

6. The C-type laser spot welding gun device with a clamping mechanism as described in claim 5, characterized in that: The frame (1) also includes a viewing window (14), which is detachably fixed to the housing (11).

7. The C-type laser spot welding gun device with a clamping mechanism as described in claim 1, characterized in that: It also includes a boom (5) and a drive cylinder (6), wherein, One end of the boom (5) is slidably mounted on the frame (1), and the other end is located on the side of the gun head (3) away from the frame (1); The drive cylinder (6) is fixedly mounted on the frame (1), and its output end is fixedly connected to the boom (5).

8. The C-type laser spot welding gun device with a clamping mechanism as described in claim 7, characterized in that: It also includes an air tube (7), which is fixedly installed on the side of the gun head (3) away from the frame (1) and on the side of the boom (5) away from the frame (1); The gun head (3) is provided with two air tubes (7), and the two air tubes (7) on the gun head (3) are symmetrically arranged about the axis of the gun head (3).

9. The C-type laser spot welding gun device with a clamping mechanism as described in claim 1, characterized in that: The end of the gun head (3) away from the frame (1) is duckbill shaped, and multiple heat dissipation holes (302) are provided on the periphery of the end of the gun head (3) away from the frame (1).

Images