Handheld laser welding gun

Abstract

The invention belongs to the technical field of welding equipment, and discloses a handheld laser welding gun which is characterized in that a protective glass is arranged at the front end of a gun body, and the gun body is provided with an air inlet channel penetrating through the gun body; the fluid director is arranged on one side of the protective glass and is closer to the end part of the gun body than the protective glass; the fluid director comprises a body part, the body part is provided with at least one connecting part, the diameter of the connecting part is larger than that of the body part, the connecting part is connected with a cover plate, and the cover plate is provided with a vent hole; a ventilation gap is formed between the body part and the cover plate in the axial direction of the body part; in the radial direction of the body part, an annular gas uniformizing channel is formed between the body part and the gun body; the air inlet channel is communicated with the air uniformizing channel, the air uniformizing channel is communicated with the ventilation gap, and the ventilation gap guides airflow to blow towards the protective glass or blow out of the gun body in the direction away from the protective glass or form a closed air wall. According to the welding gun, the using temperature of the welding gun can be effectively reduced, meanwhile, external smoke dust and impurities are prevented from flying into the welding gun, and it is effectively ensured that the lens of the protective glass is clean and tidy.

Description

Technical Field

[0001] The invention belongs to the technical field of welding equipment, and in particular relates to a handheld laser welding gun. Background Art

[0002] There is a handheld laser spot welding tool, which can be quickly replaced to realize wire feeding laser spot welding after removing the ordinary welding copper nozzle from the handheld laser welding gun. This handheld laser welding gun can be fed with cooling air flow, effectively reducing the operating temperature of the handheld laser welding gun to increase its service life.

[0003] However, although a flowing airflow is formed to achieve heat exchange, a large number of eddies are formed near the protective lens and during the entire airflow process, making it difficult for the airflow in the gun to carry out the smoke and dust, and the smoke and dust impurities outside the welding gun are easily drawn into the welding gun by the eddies, thereby affecting the use of the welding gun. Summary of the invention

[0004] In order to solve the above technical problems, the present invention discloses a handheld laser welding gun, which can effectively reduce the operating temperature of the welding gun, prevent external smoke and impurities from flying into the welding gun, and effectively ensure that the lens of the protective mirror is clean.

[0005] The specific technical solutions of the present invention are as follows: A handheld laser welding gun, comprising: a gun body, a protective mirror being provided at the front end of the gun body, and the gun body having an air intake passage running through the gun body; and A deflector, the deflector is arranged on one side of the protective mirror and is closer to the end of the gun body than the protective mirror; The deflector comprises a main body, the main body is provided with at least one connecting portion, the diameter of the connecting portion is larger than the diameter of the main body, the connecting portion is connected with a cover plate, and the cover plate has a vent hole; In the axial direction of the main body, a ventilation gap is provided between the main body and the cover plate; In the radial direction of the main body, an annular gas-uniform channel is provided between the main body and the gun body; The air inlet channel is communicated with the air uniforming channel, the air uniforming channel is communicated with the ventilation gap, and the ventilation gap guides the airflow to blow toward the protective mirror or blow out of the gun body in a direction away from the protective mirror or form a closed air wall.

[0006] In the prior art, there are two air flow paths, both of which are connected to the interior of the gun body. One is directed toward the protective mirror, flows in the opposite direction after being blocked by the protective mirror, and the other is directed away from the protective mirror and flows directly in the direction away from the protective mirror. Since the air flow enters the interior of the gun body through a single hole on one side, the air pressure unevenness in the same cross section is serious, so that when the two air flows intersect in the gun body, eddy currents will be generated, resulting in uneven wind speeds, poor heat dissipation, and external smoke and impurities are easily drawn into the welding gun; the present application uses an air uniformity channel to allow the air flow to enter the interior of the gun body after the pressure is uniform, and then the air flow is guided by the ventilation gap, and then the air flow enters the inner side of the main body (inside the gun body), thereby reducing or avoiding the eddy current formed inside the gun body, so that the air flow can flow out of the gun body along the preset flow path, thereby achieving good heat dissipation effect of the gun body, cleaning the surface of the protective mirror, and avoiding external smoke and impurities from entering the gun body.

[0007] Preferably, the cover plate is located at one end of the main body close to the protective mirror.

[0008] The structure is simple and efficient, can effectively improve the heat dissipation effect of the gun body, keep the surface of the protective mirror clean, and prevent external smoke and dust impurities from entering the gun body.

[0009] Preferably, the cover plate has a conical surface one whose inner diameter gradually increases from the direction close to the protective lens to the direction away from the protective lens, and the main body has a conical surface two whose outer diameter gradually increases from the direction close to the protective lens to the direction away from the protective lens, and the ventilation gap is formed between the conical surface one and the conical surface two to guide the airflow to blow toward the protective lens.

[0010] This structure enables the airflow to blow directly on the surface of the protective mirror after uniform pressure, forming a high-speed rotating airflow barrier at or near the protective mirror, and after being reflected by the protected mirror, a tornado structure or an airflow similar to a tornado structure is formed. Since the airflow enters the gun body only after being uniformly pressurized, there is little or no eddy current in the gun body, thereby blocking external smoke and dust impurities from entering the gun body. Therefore, on the basis of external smoke and dust impurities being difficult to enter the gun body, it is also beneficial to exhaust.

[0011] Preferably, the cover plate has a conical surface one whose outer diameter gradually decreases from the direction close to the protective lens to the direction away from the protective lens, and the main body has a conical surface two whose inner diameter gradually decreases from the direction close to the protective lens to the direction away from the protective lens, and the ventilation gap is formed between the conical surface one and the conical surface two to guide the airflow to blow out of the gun body in the direction away from the protective lens.

[0012] This structure allows the airflow to flow directly in the direction away from the protective mirror after uniform pressure. Since the airflow enters the gun body only after being uniformly pressurized, there is little or no vortex in the gun body, thereby blocking external smoke and dust impurities from entering the gun body. Therefore, on the basis of making it difficult for external smoke and dust impurities to enter the gun body, it is also conducive to exhaust.

[0013] Preferably, the ventilation gap is formed on opposite surfaces between the cover plate and the main body, which are side surface one and side surface two respectively, and the ventilation gap is formed between side surface one and side surface two to guide the airflow to form a closed air wall.

[0014] The closed air wall is parallel to the axial cross-section of the main body, or tends to be parallel to the axial structure of the main body, so that the closed air wall can effectively prevent external smoke and dust impurities from contaminating the surface of the protective mirror. Since the airflow is in a state of continuous flow during the continuous formation of the closed air wall, due to the uniform pressure, no eddy current or a small amount of eddy current will be generated in the gun body. Therefore, when the airflow is blocked by the protective mirror and flows in a direction away from the protective mirror or flows directly in a direction away from the protective mirror, it can further prevent external smoke and dust impurities from being drawn into the gun body, thereby ensuring the cleanliness of the protective mirror while achieving effective heat dissipation.

[0015] Preferably, the main body has a plurality of connecting parts, each of which is connected to a cover plate; The ventilation gap guides the airflow to blow toward the protective mirror or blow out of the gun body in a direction away from the protective mirror or form a closed air wall, and the multiple ventilation gaps on the deflector are respectively configured as one of them.

[0016] When the deflector is provided on the gun body, there can be a plurality of ventilation gaps that cooperate with each other to ensure the heat dissipation effect of the gun body and the cleanliness effect of the protective mirror.

[0017] Preferably, the airflow directions guided by the multiple ventilation gaps on the deflector are not completely the same.

[0018] This structure makes the airflow directions of the ventilation gaps at different locations different, thus achieving coordinated cooperation and further ensuring the heat dissipation effect of the gun body and the cleanliness effect of the protective lens.

[0019] Preferably, connecting parts are respectively provided at both ends of the main body.

[0020] The structure is simple, the processing is convenient, and the realization is easy.

[0021] Preferably, the diameter of the ventilation gap increases gradually from the inlet to the outlet.

[0022] This structure can effectively reduce airway resistance, make the airflow flow smoother, and optimize the gas flow. After optimizing the flow state of the airflow, it can better reduce the formation of vortices.

[0023] Preferably, the diameter of the ventilation gap is 0.01 to 20 mm.

[0024] Compared with the prior art, in the present invention, the airflow enters the gun body after being uniformly pressurized, which can effectively reduce the eddy current in the gun body, effectively reduce the temperature of the protective mirror and the gun body, and significantly improve the service life of the protective mirror; in the present invention, the airflow after uniform pressure can block external smoke and dust impurities from entering the gun body, thereby improving the smoothness of the airflow; and, when the airflow flows toward the protective mirror, it can also form a tornado structure or an airflow similar to a tornado structure, thereby ensuring the cleanliness of the surface of the protective mirror, thereby further improving the service life of the protective mirror. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the prior art; Figure 2 It is a simulation schematic diagram of the prior art; Figure 3 It is a schematic diagram of Example 1 of the present invention; Figure 4 for Figure 3 A magnified image of point A; Figure 5 for Figure 3 Simulation diagram of Figure 6 It is a schematic diagram of Example 2 of the present invention; Figure 7 for Figure 6 A magnified view of point B; Figure 8 It is a schematic diagram of Example 3 of the present invention; Fig. 9 for Figure 8 Enlarged view of point C; Fig.10 is a schematic diagram of a flow director in Example 4 of the present invention; Fig.11 It is a schematic diagram of the combination of two solutions in Example 4 of the present invention; Fig.12 It is a schematic diagram of the combination of three solutions in Example 4 of the present invention.

[0026] In the figure: 1-gun body; 2-deflector; 3-protective mirror; 4-air inlet channel; 5-main body; 6-connecting part; 7-cover plate; 8-ventilation hole; 9-ventilation gap; 10-uniform air channel; 11-air channel one; 12-air channel two; 13-conical surface one; 14-conical surface two; 15-side surface one; 16-side surface two; 17-through hole. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with specific implementation methods.

[0028] like Figure 3 to Figure 12As shown, a handheld laser welding gun comprises a gun body 1 and a deflector 2; a protective mirror 3 is provided at the front end of the gun body 1, and the gun body 1 has an air inlet channel 4 running through it; the deflector 2 is arranged on one side of the protective mirror 3, and is closer to the end of the gun body 1 than the protective mirror 3; the deflector 2 comprises a main body 5, at least one connecting portion 6 is provided on the main body 5, the diameter of the connecting portion 6 is larger than the diameter of the main body 5, a cover plate 7 is connected to the connecting portion 6, and the cover plate 7 has an air vent 8; in the axial direction of the main body 5, there is a ventilation gap 9 between the main body 5 and the cover plate 7; in the radial direction of the main body 5, there is an annular uniform air channel 10 between the main body 5 and the gun body 1; the air inlet channel 4 is connected to the uniform air channel 10, and the uniform air channel 10 is connected to the ventilation gap 9, and the ventilation gap 9 guides the airflow to blow toward the protective mirror 3 or blow out of the gun body 1 in a direction away from the protective mirror 3 or form a closed air wall.

[0029] In the prior art, the deflector 2 is usually not provided. Figure 1 , Figure 2 As shown, at the end of the air inlet channel 4, an air channel 1 11 and an air channel 2 12 are provided. The air channel 1 11 directly guides the airflow to the side close to the protective mirror 3, and the air channel 2 12 directly guides the airflow to the side away from the protective mirror 3. Since the airflow is not uniformly pressurized, there is a problem of inconsistent cross-sectional pressure, which leads to the formation of vortices. Therefore, the smoke and dust impurities in the gun body 1 are not only difficult to be taken out of the gun body 1, but also easily make the external smoke and dust impurities be drawn into the gun body 1. Moreover, in this scheme, the amount of gas actually flowing through the surface of the protective mirror 3 is very small, so the cleaning effect on the protective mirror 3 is limited. Therefore, the structure in the prior art makes the airflow not only have a limited cooling effect, but also cannot meet the cleanliness requirements of the protective mirror 3. Therefore, in this embodiment, a ventilation gap 9 is provided, and the uniformly pressurized airflow is guided to the direction of blowing toward the protective mirror 3 or away from the protective mirror 3 through the ventilation gap 9, or to form a closed air wall, so as to meet the cleanliness requirements of the protective mirror 3 while meeting the cooling requirements. In this embodiment, in the axial direction of the deflector 2, there is a transition space between the cover plate 7 and the main body 5, and the airflow enters the transition space through the uniform air passage 10, and then blows out from the ventilation gap 9. The connecting portion 6 may be provided with a through hole 17 to connect the uniform air passage 10 and the transition space. In other embodiments, the outer wall width of the main body 5 is relatively thick, so the through hole 17 may be provided on the outer wall of the main body 5.

[0030] Example 1 like Figure 3 and Figure 4As shown, the cover plate 7 has a conical surface 13 whose inner diameter gradually increases from the direction close to the protective mirror 3 to the direction away from the protective mirror 3, and the main body 5 has a conical surface 2 14 whose outer diameter gradually increases from the direction close to the protective mirror 3 to the direction away from the protective mirror 3. The ventilation gap 9 is formed between the conical surface 13 and the conical surface 2 14 to guide the airflow to blow toward the protective mirror 3. In this embodiment, the diameter of the ventilation gap 9 gradually increases from the inlet to the outlet thereof. The diameter of the ventilation gap 9 is 0.01 to 20 mm.

[0031] The airflow enters from the air inlet channel 4, passes through the air uniformization channel 10 to uniformize the pressure, and then passes through the ventilation gap 9 to align with the central area of ​​the protective mirror 3 to form a conical air knife. According to formula 1, formula 2, formula 3, formula 4, and formula 5, it can be known that the structure of this embodiment can well improve the heat exchange efficiency.

[0032] (Formula 1) In the formula, P is the pressure of the gas; V is the volume of the gas; n1 is the amount of substance in the gas; R is the ideal gas constant; T is the temperature of the gas.

[0033] (Formula 2) Where p is the static pressure of the gas; ρ is the gas density; v is the flow rate of the gas; and C is a constant.

[0034] (Formula 3) Where Q is the transferred heat; h is the heat transfer coefficient; A is the heat transfer area; ΔT is the temperature difference.

[0035] (Formula 4) Wherein, h is the heat transfer coefficient; C is a constant; Re is the Reynolds number; n2 is the exponent of the Reynolds number; Pr is the Prandtl number; and m is the exponent of the Prandtl number.

[0036] (Formula 5) Where Re is the Reynolds number; ρ is the density of the gas; v is the flow velocity of the gas; L is the flow length of the gas; μ is the dynamic viscosity of the gas.

[0037] When the airflow flows to the ventilation gap 9, it can be known from Formula 1 that, under the premise of constant pressure, constant amount of gas substance, and constant gas constant, the smaller the gas pressure, the lower the temperature. In other words, when the pressure at that location decreases, the temperature at that location decreases, thereby being able to cool down the entire gun body 1. Since the temperature of the main part of the gun body 1 decreases, the parts on the gun body 1 are cooled down, thereby extending the service life of the gun body 1 and the parts.

[0038] On the other hand, since the gas temperature decreases, the gas blown toward the protective mirror 3 is cold wind, that is, the temperature difference △T at both ends of the lens becomes larger. It can be seen from the Bernoulli equation (Formula 2) that when the gas pressure at the ventilation gap 9 decreases, the gas flow rate at this place increases. According to the heat exchange equation (Formula 3 to Formula 5), ​​since the gas density remains unchanged, the gas flow length remains unchanged, and the gas dynamic viscosity remains unchanged, the gas flow rate increases, and the Reynolds number increases, thereby obtaining an increase in the heat transfer coefficient, and then the greater the temperature difference, the higher the heat transferred. In other words, the structure provided by this embodiment can make the heat exchange rate faster, which can effectively reduce the temperature of the protective mirror 3 and greatly increase its life. In addition, since the gas flow rate at the ventilation gap 9 increases, it can form a wind knife toward the protective mirror 3, and the wind knife can clean the stains, dust, smoke, etc. on the protective mirror 3, thereby ensuring the cleanliness of the protective mirror 3.

[0039] like Figure 5 As shown, a high-speed rotating barrier is formed near the protective mirror 3, which is close to a tornado structure, thereby preventing external smoke and dust impurities from entering the gun body 1, and the airflow first enters the uniform air channel 10 for uniform pressure, and the diameter of the ventilation gap 9 from the inlet to its outlet gradually increases, so the number of eddies in the gun body 1 is very small, and the air pressure at the outlet is uniform, so that external smoke and dust impurities are difficult to be drawn into the gun body 1, which is also better conducive to exhaust.

[0040] pass Figure 2 and Figure 5 It can be seen that compared with the prior art, this embodiment can effectively reduce the temperature of the protective mirror 3 and the entire gun body 1, significantly increase the service life of the protective mirror 3, and in actual conditions the service life can be increased by dozens of times; and the wind knife formed toward the protective mirror 3 can clean the dust and stains on the surface of the protective mirror 3, thereby better increasing the service life of the protective mirror 3; in addition, the wind knife forms an air wall to block the inflow of external smoke and impurities, and can also cool the welding slag, thereby increasing the service life of the protective mirror 3. It should be noted that in Figure 2 and Figure 5 In the figure, darker red indicates higher flow rate, and lighter green indicates lower flow rate.

[0041] Example 2 The difference between this embodiment and embodiment 1 is that Figure 6 and Figure 7 As shown, the cover plate 7 has a conical surface 13 whose outer diameter gradually decreases from the direction close to the protective mirror 3 to the direction away from the protective mirror 3, and the main body 5 has a conical surface 14 whose inner diameter gradually decreases from the direction close to the protective mirror 3 to the direction away from the protective mirror 3, and the ventilation gap 9 is formed between the conical surface 13 and the conical surface 14 to guide the airflow to blow out the gun body 1 in the direction away from the protective mirror 3.

[0042] In this embodiment, the airflow is guided to flow in the direction away from the protective mirror 3 at the ventilation gap 9, so the airflow does not directly contact the protective mirror 3. Since the airflow is firstly evenly compressed, eddy currents are rarely generated during the flow in the gun body 1. Therefore, the airflow flows stably and smoothly, and the exhaust effect is good.

[0043] Example 3 The difference between this embodiment and embodiment 1 is that Figure 8 and Fig. 9 As shown, the ventilation gap 9 is formed between the cover plate 7 and the main body 5 at opposite surfaces, namely the side 15 and the side 2 16 , and the ventilation gap 9 is formed between the side 15 and the side 2 16 to guide the airflow to form a closed air wall.

[0044] In this embodiment, the closed air wall is parallel to the axial cross section of the main body 5, or tends to be parallel to the axial structure of the main body 5. In fact, since the diameter from the inlet to the outlet of the ventilation gap 9 gradually increases, the closed air wall will present a convex shape toward the protective mirror 3, and the technical effect brought by embodiment 1 can also be achieved at this time. No further details will be given here.

[0045] Example 4 In this embodiment, the main body 5 has a plurality of connecting parts 6, each of which is connected to a cover plate 7; the ventilation gap 9 guides the airflow to blow toward the protective mirror 3 or blow out of the gun body 1 in a direction away from the protective mirror 3 or form a closed air wall, and the plurality of ventilation gaps 9 on the deflector 2 are respectively configured as one of them. Furthermore, the airflow directions guided by the plurality of ventilation gaps 9 on the deflector 2 are not completely the same. Fig.10 As shown, the example of providing the connecting parts 6 at both ends of the main body 5 is used for explanation.

[0046] like Fig.11 As shown, the ventilation gap 9 formed between the connection part 6 at the left end of the deflector 2 and the cover plate 7 guides the airflow to blow toward the protective mirror 3, and the ventilation gap 9 formed between the connection part 6 at the right end of the deflector 2 and the cover plate 7 guides the airflow to blow out of the gun body 1 in a direction away from the protective mirror 3. Therefore, after the two are combined, the heat dissipation effect and the cleaning effect are further improved. That is to say, on the basis of airflow uniform pressure, this embodiment forms a high-speed rotating barrier at the left end of the deflector 2, close to the protective mirror 3, while at the right end of the deflector 2, the airflow is directly guided to flow in a direction away from the protective mirror 3. Therefore, under the premise of less eddy current in the gun body 1, the flow of airflow from left to right can achieve faster and more efficient heat dissipation, ensure the cleanliness of the protective mirror 3, and prevent external smoke and dust impurities from being drawn into the gun body 1.

[0047] It can be seen that in the three cases where the ventilation gap 9 guides the airflow to blow toward the protective mirror 3 or blows out of the gun body 1 in a direction away from the protective mirror 3 or forms a closed air wall, as shown in FIG. Figure 3 to Figure 9 As shown, each solution can be used separately, such as Fig.11 As shown, any two of them can also be used in combination, or as shown Fig.12 As shown, all three are used simultaneously.

[0048] It should be noted that, in the present embodiment, the airflow usually enters the uniform air channel 10 through the air inlet channel 4 and the air channel 12 in sequence, and then the uniform air channel 10 enters the transition space through the through hole 17, and finally enters the gun body 1 from the ventilation gap 9. In other embodiments, the airflow can also enter the transition space through the air channel 12 at the same time based on the structure of the prior art, and at this time, the uniform pressure requirements and airflow acceleration requirements are also met.

[0049] The above are only preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as limiting the present invention, and the protection scope of the present invention should be based on the scope defined by the claims. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A handheld laser welding gun, characterized in that: include: A gun body, a protective mirror being provided at the front end of the gun body, and the gun body having an air intake passage running through the gun body; as well as A deflector, the deflector is arranged on one side of the protective mirror and is closer to the end of the gun body than the protective mirror; The deflector comprises a main body, the main body is provided with at least one connecting portion, the diameter of the connecting portion is larger than the diameter of the main body, the connecting portion is connected with a cover plate, and the cover plate has a vent hole; In the axial direction of the main body, a ventilation gap is provided between the main body and the cover plate; In the radial direction of the main body, an annular gas-uniform channel is provided between the main body and the gun body; The air inlet channel is communicated with the air uniforming channel, the air uniforming channel is communicated with the ventilation gap, and the ventilation gap guides the airflow to blow toward the protective mirror or blow out of the gun body in a direction away from the protective mirror or form a closed air wall.

2. A handheld laser welding gun as claimed in claim 1, characterized in that: The cover plate is located at one end of the main body close to the protective mirror.

3. A handheld laser welding gun as claimed in claim 2, characterized in that: The cover plate has a conical surface 1 whose inner diameter gradually increases from the direction close to the protective mirror to the direction away from the protective mirror, and the main body has a conical surface 2 whose outer diameter gradually increases from the direction close to the protective mirror to the direction away from the protective mirror. The ventilation gap is formed between the conical surface 1 and the conical surface 2 to guide the airflow to blow toward the protective mirror.

4. A handheld laser welding gun as claimed in claim 2, characterized in that: The cover plate has a conical surface 1 whose outer diameter gradually decreases from the direction close to the protective mirror to the direction away from the protective mirror, and the main body has a conical surface 2 whose inner diameter gradually decreases from the direction close to the protective mirror to the direction away from the protective mirror. The ventilation gap is formed between the conical surface 1 and the conical surface 2 to guide the airflow to blow out of the gun body in the direction away from the protective mirror.

5. A handheld laser welding gun as claimed in claim 2, characterized in that: The ventilation gap is formed on opposite sides between the cover plate and the main body, which are side surface one and side surface two respectively. The ventilation gap is formed between side surface one and side surface two to guide the airflow to form a closed air wall.

6. A handheld laser welding gun as claimed in claim 1, characterized in that: The main body has a plurality of connecting parts, each of which is connected to a cover plate; The ventilation gap guides the airflow to blow toward the protective mirror or blow out of the gun body in a direction away from the protective mirror or form a closed air wall, and the multiple ventilation gaps on the deflector are respectively configured as one of them.

7. A handheld laser welding gun as claimed in claim 6, characterized in that: The airflow directions guided by the multiple ventilation gaps on the deflector are not completely the same.

8. A handheld laser welding gun as claimed in claim 7, characterized in that: Connecting parts are respectively arranged at two ends of the main body.

9. A handheld laser welding gun as claimed in any one of claims 1 to 8, characterized in that: The diameter of the ventilation gap increases gradually from the inlet to the outlet.

10. A handheld laser welding gun as claimed in any one of claims 1 to 8, characterized in that: The diameter of the ventilation gap is 0.01-20 mm.

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