A high-safety handheld laser welding device

Abstract

The present invention relates to the technical field of laser welding equipment, and specifically to a high-safety handheld laser welding equipment, comprising a welding equipment body, a winding plate, a first support plate, a second support plate and a connecting pipe, wherein folding plates are installed on both sides of the second support plate, a connecting groove is opened at the bottom of the folding plate, and a rotating shaft four is inserted into the inner wall of the connecting groove; the beneficial effect is: by pushing the connecting rod, it is driven to slide along the inner wall of the auxiliary groove, and because the rotating shaft four is restricted by the limit groove, the connecting rod can be hinged on the inner wall of the auxiliary groove and push the two folding plates to fold on both sides of the second support plate, thereby reducing the scratches on the connecting pipe when the worker pulls the connecting pipe, thereby reducing the risk of leakage of the connecting pipe and improving the safety of the welding equipment body. When resetting, the elastic force of the elastic member is used to pull the connecting rod to reset, and at the same time drive the folding plates on both sides of the second support plate to reset, thereby improving the use effect of the welding equipment body.

Description

Technical Field

[0001] The invention relates to the technical field of laser welding equipment, in particular to a high-safety handheld laser welding equipment. Background Art

[0002] With the development of modern industry, the importance of welding technology in the manufacturing industry has become increasingly prominent. As a new welding tool, handheld laser welding equipment has gradually been favored by the market due to its high efficiency, precision and flexibility. However, the existing handheld laser welding equipment still has some shortcomings during use, especially in the design of connecting pipes. These problems directly affect the operating stability and safety of the equipment.

[0003] In the prior art, when traditional handheld laser welding equipment is not in use, the operator needs to manually wrap the connecting tube around the top of the equipment. This method is not only inconvenient, but also increases the labor intensity of the operator. Although the existing handheld laser welding equipment does not require manual winding of the connecting tube, the connecting tube is directly rolled up by the rotation of the turntable during winding. However, when using the connecting tube, the worker will directly pull the connecting tube for use. This violent pulling will cause the connecting tube to tighten on the outside of the turntable and scratch against the side of the support plate, making the connecting tube susceptible to damage. This situation will cause coolant leakage, thereby affecting the cooling effect of the welding gun and reducing the safety and stability of the handheld laser welding equipment.

[0004] Therefore, a high-safety handheld laser welding device is needed to solve the problem that the connecting tube of the existing handheld laser welding device is easily tightened and scratched against the support plate during use, thereby causing the connecting tube to be easily damaged, thereby affecting the safety and stability of the handheld laser welding device. Summary of the invention

[0005] The object of the present invention is to provide a high-safety handheld laser welding device to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a high-safety handheld laser welding device, comprising a welding device body, a winding plate, a first support plate, a second support plate and a connecting tube, folding plates are installed on both sides of the second support plate, a connecting groove is provided at the bottom of the folding plate, a rotating shaft four is inserted into the inner wall of the connecting groove, two rotating shafts three are installed on both sides of the second support plate, two connecting plates two are installed on the side of the folding plate close to the second support plate, the connecting plate two is sleeved on the outside of the rotating shaft three, a plurality of limiting grooves are provided on the top of the winding plate, the rotating shaft four is inserted into the inner wall of the limiting groove and passes through the limiting groove.

[0007] Preferably, a plurality of slide grooves are provided on the top of the winding plate, two movable grooves are provided on the side of the slide groove close to the second support plate, a rotating shaft 1 is installed on the inner wall of the movable groove, a connecting rod is hinged on the upper outer side of the rotating shaft 1, an elastic part is installed on the inner wall of the movable groove, and two auxiliary grooves are provided on the side of the slide groove close to the second support plate.

[0008] Preferably, the connecting rod is installed between the side close to the second supporting piece and the rotating shaft 4, and the connecting rod is installed on the inner wall of the auxiliary groove, and the side of the connecting rod away from the second supporting piece is inserted into the top of the movable groove.

[0009] Preferably, the elastic member is installed between one end away from the second supporting sheet and the first rotating shaft.

[0010] Preferably, a slider is installed at the bottom of the inner wall of the slide groove, a support plate is installed on the top of the slider, a second rotating shaft is installed on the upper part of the support plate, a connecting plate is sleeved on the outer side of the second rotating shaft, push blocks are installed on both sides of the bottom of the first support plate, a tension spring is installed on the side of the support plate close to the second support plate, and two slots are opened on the upper side of the inner wall of the slide groove.

[0011] Preferably, the connecting plate 1 is installed at the bottom of the first supporting plate, and the side of the pushing block close to the connecting plate 1 is in contact with the supporting plate.

[0012] Preferably, the tension spring is installed between one end close to the second supporting sheet and the inner wall of the slide slot, and a plurality of tension springs are arranged in a ring-shaped distribution.

[0013] Preferably, a plurality of rubber convex balls are installed on the top of the first supporting sheet, a rubber plate is installed on the top of one side of the first supporting sheet close to the second supporting sheet, and a fitting groove is provided on the top of the welding equipment body.

[0014] Preferably, after the first supporting sheet is folded, the plurality of rubber convex balls are all inserted into the inner wall of the fitting groove and are in an extruded deformation state.

[0015] Preferably, the bottoms of the multiple folding plates are all in contact with the top of the winding plate, every two folding plates form a group, and the multiple groups of folding plates are arranged in a ring-shaped distribution on the top of the winding plate, and the limiting groove is connected with the auxiliary groove.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The high-safety handheld laser welding equipment proposed in the present invention drives the connecting rod to slide along the inner wall of the auxiliary groove by pushing it. Since the rotating shaft four is restricted by the limit groove, the connecting rod can be hinged on the inner wall of the auxiliary groove and push the two folding plates to fold on both sides of the second support piece, thereby reducing the scratches on the connecting pipe when the workers pull the connecting pipe, thereby reducing the risk of leakage of the connecting pipe and improving the safety of the welding equipment body. When resetting, the elastic force of the elastic member is used to pull the connecting rod to reset, and at the same time drive the folding plates on both sides of the second support piece to reset, thereby improving the use effect of the welding equipment body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a stereogram of the present invention;

[0019] Figure 2 It is a front view of the winding plate of the present invention;

[0020] Figure 3 for Figure 2 Structural cross-section at the middle BB;

[0021] Figure 4 for Figure 3 Enlarged view of the structure at E in the middle;

[0022] Figure 5 for Figure 2 The schematic diagram of the structure of the left part;

[0023] Figure 6 for Figure 2 The partially enlarged structural cross-section at AA in the middle;

[0024] Figure 7 for Figure 6 A magnified view of the structure at F in the middle;

[0025] Figure 8 for Figure 2 A partially enlarged structural cross-section at the middle CC;

[0026] Fig. 9 It is a schematic diagram of the winding plate structure of the present invention;

[0027] Fig.10 for Fig. 9 A magnified view of the structure at G in the middle;

[0028] Fig.11 This is a schematic diagram of the support plate structure of the present invention;

[0029] Fig.12 It is a schematic diagram of the connecting rod structure of the present invention;

[0030] Fig.13 This is a structural cross-sectional view when the present invention is used.

[0031] In the figure: 1. welding equipment body; 2. winding plate; 3. fitting groove; 4. first support plate; 5. second support plate; 6. slide groove; 7. tension spring; 8. support plate; 9. connecting plate one; 10. push block; 11. slider; 12. rubber convex ball; 13. rubber plate; 14. connecting rod; 15. folding plate; 16. slot; 17. auxiliary groove; 18. rotating shaft one; 19. elastic member; 20. moving groove; 21. limiting groove; 22. rotating shaft two; 23. connecting plate two; 24. rotating shaft three; 25. connecting groove; 26. rotating shaft four; 27. connecting pipe. DETAILED DESCRIPTION

[0032] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Example 1: Please refer to Figures 1 to 13 The present invention provides a technical solution: a high-safety handheld laser welding device, comprising a welding device body 1, a winding plate 2, a first support sheet 4, a second support sheet 5 and a connecting tube 27, the winding plate 2 rotates on the top of the welding device body 1, and the first support sheet 4 and the second support sheet 5 are used to wind up and store the connecting tube 27, folding plates 15 are installed on both sides of the second support sheet 5, a connecting groove 25 is opened at the bottom of the folding plate 15, and a rotating shaft 4 26 is inserted into the inner wall of the connecting groove 25, two rotating shafts 3 24 are installed on both sides of the second support sheet 5, two connecting plates 2 23 are installed on the side of the folding plate 15 close to the second support sheet 5, and the connecting plate 2 23 is sleeved on the outer side of the rotating shaft 3 24, and the top of the winding plate 2 A plurality of limit grooves 21 are provided, and a fourth rotating shaft 26 is inserted into the inner wall of the limit groove 21 and passes through the limit groove 21; the bottoms of the plurality of folding plates 15 are all fitted with the top of the winding plate 2, and every two folding plates 15 form a group, and the plurality of groups of folding plates 15 are arranged in a ring-shaped distribution on the top of the winding plate 2, so as to facilitate the retraction and release of the connecting tube 27, and when the worker pulls the connecting tube 27, the folding plates 15 are folded on both sides of the second support plate 5 to prevent the connecting tube 27 from being scratched by the second support plate 5 and causing it to be damaged, thereby improving the safety of the welding equipment body 1, and the limit groove 21 is connected with the auxiliary groove 17, so as to facilitate the movement of the rotating shaft four 26 on the inner wall of the limit groove 21 and drive the folding plate 15 to fold.

[0034] Since the rotating shaft four 26 is installed on the inner wall of the limiting groove 21 and is restricted by the limiting groove 21, the connecting rod 14 is driven to hinge along the inner wall of the auxiliary groove 17, and the rotating shaft four 26 is used to push the folding plate 15 to fold. At the same time, the folding plate 15 is hinged to the second support plate 5 through the connecting plate two 23 and the rotating shaft three 24, thereby driving the folding plate 15 to fold on both sides of the second support plate 5. Then, the worker can pull the connecting pipe 27 at will to prevent damage to the connecting pipe 27 due to violent pulling, thereby preventing the risk of leakage, so as to improve the safety and use effect of the welding equipment body 1.

[0035] Embodiment 2: On the basis of embodiment 1, in order to facilitate the folding and resetting of the folding plate 15, a plurality of slide grooves 6 are provided on the top of the winding plate 2, and two movable grooves 20 are provided on the side of the slide groove 6 close to the second support plate 5, and a rotating shaft 18 is installed on the inner wall of the movable groove 20, and a connecting rod 14 is hinged on the upper outer side of the rotating shaft 18, and an elastic member 19 is installed on the inner wall of the movable groove 20, and two auxiliary grooves 17 are provided on the side of the slide groove 6 close to the second support plate 5; the connecting rod 14 is installed between the rotating shaft 4 26 on the side close to the second support plate 5, and the connecting rod 14 It is installed on the inner wall of the auxiliary groove 17, and the side of the connecting rod 14 away from the second supporting piece 5 is inserted into the top of the movable groove 20, so that by pushing the connecting rod 14, one side of it is driven to move along the inner wall of the auxiliary groove 17, and due to the limitation of the rotating shaft four 26 and the limiting groove 21, the folding plate 15 is driven to fold, thereby preventing the connecting pipe 27 from being damaged during use; the elastic member 19 is installed between one end away from the second supporting piece 5 and the rotating shaft one 18, so that the elastic force of the elastic member 19 is used to drive the rotating shaft one 18 to return to its original position along the inner wall of the movable groove 20, and pull the connecting rod 14 to return to its original position.

[0036] The connecting rod 14 is pushed and driven, and the rotating shaft 18 at its bottom is driven to slide along the inner wall of the movable groove 20, and squeeze the elastic member 19. At this time, since the rotating shaft 4 26 is installed on the inner wall of the limiting groove 21 and is restricted by the limiting groove 21, the connecting rod 14 is driven to hinge along the inner wall of the auxiliary groove 17, and the rotating shaft 4 26 is used to push the folding plate 15 to fold. When resetting, the pushing of the connecting rod 14 is released, and the elastic force of the elastic member 19 is used to drive the rotating shaft 18 to reset, and pull the folding plate 15 to reset.

[0037] Embodiment 3: On the basis of embodiment 2, in order to facilitate the upper and lower connecting tubes 27 and synchronously drive the folding plate 15 to fold, so as to prevent the outer side of the connecting tube 27 from being damaged when in use, a slider 11 is installed at the bottom of the inner wall of the slide 6, a support plate 8 is installed on the top of the slider 11, a second rotating shaft 22 is installed on the upper part of the support plate 8, a connecting plate 1 9 is sleeved on the outer side of the second rotating shaft 22, push blocks 10 are installed on both sides of the bottom of the first support sheet 4, a tension spring 7 is installed on the side of the support plate 8 close to the second support sheet 5, and two slots 16 are provided on the upper side of the inner wall of the slide 6; the connecting plate 1 9 is installed at the bottom of the first support sheet 4, so as to pull the first support sheet 4, driving the slider 11 to slide along the inner wall of the slide groove 6, thereby facilitating the folding of the first support sheet 4, and the side of the push block 10 close to the connecting plate 9 fits between the support plate 8, so that it can be synchronously folded with the first support sheet 4 and inserted into the inner wall of the slot 16, and then the elastic force of the tension spring 7 is used to drive the two push blocks 10 to push one side of the connecting rod 14, so as to synchronously drive the folding plate 15 to fold; the tension spring 7 is installed between one end close to the second support sheet 5 and the inner wall of the slide groove 6, and multiple tension springs 7 are arranged in a ring shape, so as to utilize the elastic force of the tension spring 7 to facilitate the first support sheet 4 to be reset, and clamp the connecting tube 27 to increase the stability of winding.

[0038] When the first support piece 4 is pulled outward, the slider 11 at the bottom thereof and the support plate 8 are driven to slide along the inner wall of the slide groove 6. When the first support piece 4 is slid to the side of the slide groove 6 away from the second support piece 5, the first support piece 4 is folded downward, driving the connecting plate 19 to be folded and hinged along the outer side of the rotating shaft 22, and driving the push block 10 to be converted from a vertical state to a horizontal state. At this time, since the support plate 8 will pull the tension spring 7 when sliding outward along the inner wall of the slide groove 6, the elastic force of the tension spring 7 is used to pull the support plate 8 to reset, and drive the slot 16 and the two sides of the first support piece 4 to be inserted along the inner wall of the slot 16 toward the center direction of the winding plate 2, thereby driving one side of the push block 10 to gradually fit between the side of the connecting rod 14 away from the second support piece 5, and driving the folding plate 15 to be folded on both sides of the second support piece 5. When resetting, the winding plate 2 is first rotated to wrap the connecting tube 27 around multiple second support pieces 5, after completion, the first support piece 4 is pulled respectively, driving the push block 10 to slide outward along the inner walls of the slots 16 on both sides. At this time, the push on the connecting rod 14 is released, so that the elastic force of the elastic member 19 is used to drive the rotating shaft 18 to return to its original position, and the folding plate 15 is pulled to return to its original position. Subsequently, when the support plate 8 moves to the side of the slide groove 6 away from the second support piece 5, the first support plate 4 is folded upward, driving the push blocks 10 on both sides thereof to be converted from a horizontal state to a vertical state, and the bottom of the first support piece 4 is fitted with the top of the winding plate 2, and then the elastic force of the tension spring 7 is used to pull the support plate 8 and the slider 11 to return to their original position along the inner wall of the slide groove 6, and the first support piece 4 is pushed to push the connecting pipe 27 wound around the outer sides of the plurality of second support pieces 5, so that a clamping is formed between the two, thereby increasing the winding stability of the connecting pipe 27 and facilitating subsequent use, thereby improving the use effect of the welding equipment body 1.

[0039] Embodiment 4: On the basis of embodiment 3, in order to increase the stability of the first support sheet 4 rotating on the top of the welding equipment body 1, a plurality of rubber convex balls 12 are installed on the top of the first support sheet 4, a rubber plate 13 is installed on the top of the side of the first support sheet 4 close to the second support sheet 5, and a fitting groove 3 is opened on the top of the welding equipment body 1; after the first support sheet 4 is folded, the plurality of rubber convex balls 12 are all inserted into the inner wall of the fitting groove 3 and are in an extruded deformation state, so that the rubber convex balls 12 are used to make one side of the first support sheet 4 fit with the top of the welding equipment body 1 to increase its stability in rotating with the winding plate 2, and the setting of the rubber plate 13 is used to reduce the wear and damage of the connecting pipe 27 during the retraction process, thereby improving the safety of the welding equipment body 1.

[0040] When the winding plate 2 rotates, the rubber convex ball 12 on the top of the first support sheet 4 will fit with the top of the welding equipment body 1 after being folded, and will be pulled by the tension spring 7, driving multiple rubber convex balls 12 to gradually insert into the inner wall of the fitting groove 3, thereby increasing the stability of the winding plate 2 during rotation. At the same time, the rubber plate 13 on one side of the first support sheet 4 will also be folded synchronously, reducing the friction between the connecting tube 27 and the welding equipment body 1 when it is rolled up on the outside of the multiple second support sheets 5, thereby increasing its service life.

[0041] Embodiment 5: Based on Embodiment 4, a method for using a high-safety handheld laser welding device is proposed, and the method comprises the following steps:

[0042] Step 1, first pull the first support piece 4 outward respectively, drive the slider 11 at the bottom thereof and the support plate 8 to slide along the inner wall of the slide groove 6, when sliding to the side of the slide groove 6 away from the second support piece 5, fold the first support piece 4 downward, drive the connecting plate 1 9 to be folded and hinged along the outer side of the rotating shaft 22, and drive the push block 10 to be converted from a vertical state to a horizontal state. At this time, since the support plate 8 will pull the tension spring 7 when sliding outward along the inner wall of the slide groove 6, the elastic force of the tension spring 7 is used to pull the support plate 8 to reset, and drive the slot 16 and the two sides of the first support piece 4 to be inserted along the inner wall of the slot 16 toward the center direction of the winding plate 2, thereby driving one side of the push block 10 to gradually move between the side of the connecting rod 14 away from the second support piece 5. The connecting rod 14 is fitted and pushed against the connecting rod 14, driving the rotating shaft 18 at the bottom thereof to slide along the inner wall of the movable groove 20 and squeeze the elastic member 19. At this time, since the rotating shaft 4 26 is installed on the inner wall of the limiting groove 21 and is restricted by the limiting groove 21, the connecting rod 14 is driven to hinge along the inner wall of the auxiliary groove 17, and the rotating shaft 4 26 is used to push the folding plate 15 to fold. At the same time, the folding plate 15 is hinged to the second supporting piece 5 through the connecting plate 23 and the rotating shaft 3 24, thereby driving the folding plate 15 to fold on both sides of the second supporting piece 5. Then, the worker can pull the connecting pipe 27 at will to prevent damage to the connecting pipe 27 during violent pulling, thereby preventing the risk of leakage, so as to improve the safety and use effect of the welding equipment body 1;

[0043] Step 2: When the winding plate 2 rotates, the rubber convex ball 12 on the top of the first support sheet 4 will fit with the top of the welding device body 1 after being folded, and the rubber convex balls 12 are pulled by the tension spring 7 to gradually insert into the inner wall of the fitting groove 3, thereby increasing the stability of the winding plate 2 when rotating. At the same time, the rubber sheet 13 on one side of the first support sheet 4 will also be folded synchronously, reducing the friction between the connecting tube 27 and the welding device body 1 when it is rolled outside the plurality of second support sheets 5, thereby increasing its service life;

[0044] The first support piece 4 is pulled to push the connecting tube 27 around the outer side of the plurality of second support pieces 5. At this time, the push of the connecting rod 14 is released, so that the elastic force of the elastic member 19 is used to drive the rotating shaft 18 to reset, and the folding plate 15 is pulled to reset. Subsequently, when the supporting plate 8 moves to the side of the slide groove 6 away from the second support piece 5, the first supporting plate 4 is folded upward, driving the push blocks 10 on both sides thereof to change from a horizontal state to a vertical state, and the bottom of the first supporting piece 4 is fitted with the top of the winding plate 2, and then the elastic force of the tension spring 7 is used to pull the supporting plate 8 and the sliding block 11 to reset along the inner wall of the slide groove 6, and the first supporting piece 4 is pushed to push the connecting tube 27 wound around the outer side of the plurality of second support pieces 5, so that a clamping is formed between the two, thereby increasing the winding stability of the connecting tube 27 and facilitating subsequent use, thereby improving the use effect of the welding equipment body 1.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-safety handheld laser welding device, comprising a welding device body (1), a winding plate (2), a first supporting plate (4), a second supporting plate (5) and a connecting pipe (27), characterized in that: Folding plates (15) are installed on both sides of the second support plate (5), a connecting groove (25) is provided at the bottom of the folding plate (15), a rotating shaft four (26) is inserted into the inner wall of the connecting groove (25), two rotating shafts three (24) are installed on both sides of the second support plate (5), two connecting plates two (23) are installed on the side of the folding plate (15) close to the second support plate (5), the connecting plate two (23) is sleeved on the outer side of the rotating shaft three (24), a plurality of limiting grooves (21) are provided on the top of the winding plate (2), the rotating shaft four (26) is inserted into the inner wall of the limiting groove (21) and passes through the limiting groove (21); The top of the winding plate (2) is provided with a plurality of slide grooves (6), and the slide groove (6) is provided with two movable grooves (20) on a side close to the second support plate (5), a rotating shaft (18) is installed on the inner wall of the movable groove (20), a connecting rod (14) is hingedly connected to the upper outer side of the rotating shaft (18), an elastic member (19) is installed on the inner wall of the movable groove (20), and the slide groove (6) is provided with two auxiliary grooves (17) on a side close to the second support plate (5); The bottoms of the plurality of folding plates (15) are all in contact with the top of the winding plate (2), two folding plates (15) form a group, and the plurality of groups of folding plates (15) are arranged in a circular distribution on the top of the winding plate (2), and the limiting groove (21) is connected to the auxiliary groove (17).

2. A high-safety handheld laser welding device according to claim 1, characterized in that: The connecting rod (14) is installed between a side close to the second supporting plate (5) and the rotating shaft (26), and the connecting rod (14) is installed on the inner wall of the auxiliary groove (17). The side of the connecting rod (14) away from the second supporting plate (5) is inserted into the top of the movable groove (20).

3. A high-safety handheld laser welding device according to claim 1, characterized in that: The elastic member (19) is installed between one end away from the second supporting plate (5) and the first rotating shaft (18).

4. A high-safety handheld laser welding device according to claim 1, characterized in that: A slider (11) is installed at the bottom of the inner wall of the slide groove (6), a support plate (8) is installed on the top of the slider (11), a second rotating shaft (22) is installed on the upper part of the support plate (8), a connecting plate (9) is sleeved on the outer side of the second rotating shaft (22), push blocks (10) are installed on both sides of the bottom of the first support plate (4), a tension spring (7) is installed on the side of the support plate (8) close to the second support plate (5), and two slots (16) are provided on the upper side of the inner wall of the slide groove (6).

5. A high-safety handheld laser welding device according to claim 4, characterized in that: The connecting plate 1 (9) is mounted on the bottom of the first supporting plate (4), and the side of the pushing block (10) close to the connecting plate 1 (9) is fitted between the supporting plate (8).

6. A high-safety handheld laser welding device according to claim 4, characterized in that: The tension spring (7) is installed between one end close to the second support sheet (5) and the inner wall of the slide groove (6), and a plurality of tension springs (7) are arranged in a ring-shaped distribution.

7. A high-safety handheld laser welding device according to claim 4, characterized in that: A plurality of rubber convex balls (12) are installed on the top of the first support sheet (4), a rubber plate (13) is installed on the top of one side of the first support sheet (4) close to the second support sheet (5), and a fitting groove (3) is provided on the top of the welding equipment body (1).

8. The high-safety handheld laser welding device according to claim 7, characterized in that: After the first supporting sheet (4) is folded, the plurality of rubber convex balls (12) are inserted into the inner wall of the fitting groove (3) and are in an extruded deformed state.

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