Laser welding device for aluminum profile machining

Abstract

The invention relates to the technical field of welding, in particular to a laser welding device for aluminum profile machining. According to the laser welding device for aluminum profile machining, the pressure can be evenly controlled, and deviation can be prevented. According to the technical scheme, the system comprises a support platform and the like; a first frame is installed on the supporting platform, a telescopic frame is installed on the first frame, an air cylinder is installed on the first frame, and the telescopic end of the air cylinder is connected with the telescopic frame. According to the aluminum profile positioning device, the lead screws drive the special-shaped frames to move close to each other, then the rectangular frames drive the extrusion plates to clamp and position aluminum profiles front and back, and therefore the aluminum profile positioning function is achieved, and meanwhile, in the process that the lead screws continue to drive the special-shaped frames to move close to each other, balls are matched with spiral grooves, and positioning is achieved. And meanwhile, the extrusion plate drives the aluminum profiles to move transversely, so that the two ends of the two aluminum profiles are automatically aligned, and the machining efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and in particular to a laser welding apparatus for aluminum profile processing. Background Technology

[0002] Aluminum is a metallic material made with aluminum as the base and alloying elements such as copper, magnesium, and silicon. It has low density, high thermal and electrical conductivity, and oxidation resistance. Aluminum is widely used in construction, transportation, and power industries. In construction, it is used for door and window frames and roof panels, while in transportation, it is used for lightweight automotive components and rail transit equipment.

[0003] In the manufacturing field of aluminum profile processing, the simple mechanical structures commonly used in the current laser welding of aluminum profiles are difficult to achieve uniformity and synchronization of the pressure applied to the workpiece by the two clamping plates. Pressure imbalance will directly cause the workpiece to shift during the clamping process, which will significantly reduce the positioning accuracy. The decrease in positioning accuracy will not only affect the accuracy of the initial welding position, making it impossible for the laser beam to be accurately aligned with the weld start point, but may also cause positional changes due to uneven force on the workpiece during the welding process, ultimately resulting in problems such as skewed weld trajectory and inconsistent penetration depth. In severe cases, it may even lead to safety hazards such as insufficient weld strength. Summary of the Invention

[0004] To overcome the drawbacks of uneven pressure and deviation, the technical problem of this invention is to provide a laser welding device for aluminum profile processing that can uniformly control pressure and prevent deviation.

[0005] The technical implementation of the present invention is as follows: a laser welding device for aluminum profile processing includes a support platform, a frame one mounted on the support platform, a telescopic frame mounted on the frame one, a cylinder mounted on the frame one, the telescopic end of the cylinder being connected to the telescopic frame, a rotary welding mechanism being provided on the telescopic frame, a frame two mounted at the bottom of the support platform, a driving mechanism being provided on the frame two for driving the rotary welding mechanism to move, a shaped frame slidably mounted on the support platform, a clamping mechanism being provided on the shaped frame for clamping and positioning the aluminum profile.

[0006] Preferably, the rotary welding mechanism includes a hollow turbine, a support frame and a sliding frame are provided on the support platform, the hollow turbine is rotatably mounted on the support frame and the sliding frame, the telescopic frame is rotatably connected to the hollow turbine, a fixed frame is installed inside the hollow turbine, an elastic rod is slidably connected to the fixed frame, a rubber wheel is rotatably mounted inside the elastic rod, and a laser welding gun is slidably mounted through the fixed frame, with the elastic rod connected to the laser welding gun.

[0007] Preferably, the drive mechanism includes a lead screw, which is rotatably mounted on the second frame. A worm gear is provided in the middle of the lead screw, and the worm gear meshes with a hollow turbine. A motor is mounted on the support platform, and the output shaft of the motor is connected to the lead screw. A rectangular slot is provided on the irregular frame, and a nut is slidably connected in the rectangular slot. The nut is threadedly connected to the lead screw.

[0008] Preferably, it also includes an L-shaped frame, and each of the opening and closing nuts is connected to an L-shaped frame. The L-shaped frame is slidably connected to the rectangular groove of the irregular frame, and a first spring is connected between them.

[0009] Preferably, the second frame is provided with a wedge-shaped groove, and one side of the L-shaped frame is set as an inclined surface. The L-shaped frame and the wedge-shaped groove cooperate to separate the opening and closing nut.

[0010] Preferably, it also includes a locking frame, with locking frames symmetrically installed on one side of the irregular frame. The locking frame has a limit groove, and the second frame has a through hole adapted to the locking frame. A wedge block is slidably connected inside the second frame, and a second spring is connected between them. The wedge block cooperates with the limit groove on the locking frame.

[0011] Preferably, it also includes a steel wire rope, which is fixed to the wedge block and passes through the second frame. The steel wire rope cooperates with the sliding frame, and an elastic element connects the irregular frame and the second frame.

[0012] Preferably, the clamping mechanism includes a rectangular frame, with rectangular frames symmetrically fixed to the irregular frame, a rack provided on the rectangular frame, a slotted groove formed on the rectangular frame, a sliding block slidably connected in the slotted groove, and a gear rotatably connected to the sliding block, the gear meshing with the rack.

[0013] Preferably, the clamping mechanism further includes a fixed cylinder, the gear is provided with a fixed cylinder, a pressing plate is slidably connected inside the fixed cylinder, and a third spring is provided between the fixed cylinder and the pressing plate.

[0014] Preferably, a spiral groove is provided inside the fixed cylinder, and a ball bearing is rotatably connected to one end of the extrusion plate, the ball bearing cooperating with the spiral groove.

[0015] The present invention has the following advantages: 1. This invention uses a lead screw to drive the irregularly shaped frames to move closer to each other, and then uses a rectangular frame to drive the extrusion plate to clamp and position the aluminum profile from front to back, thereby realizing the positioning function of the aluminum profile. At the same time, as the lead screw continues to drive the irregularly shaped frames to move closer to each other, the cooperation of the ball bearings and the spiral groove causes the fixed cylinder to drive the gear to move laterally, and the extrusion plate drives the aluminum profile to move laterally, so that the two aluminum profiles can achieve automatic alignment at both ends and improve processing efficiency.

[0016] 2. The steel wire rope is released by the downward movement of the sliding frame, which in turn causes the second spring to drive the wedge block to move downward and contact the limiting groove of the locking frame. The wedge block restricts the movement of the locking frame, and the irregular frame restricts the movement of the clamping mechanism. At the same time, it can achieve stability when welding two aluminum profiles and prevent misalignment during the welding of two aluminum profiles. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial structural diagram of the present invention; Figure 3 This is a schematic diagram of the annular welding structure of the present invention; Figure 4 This is a schematic diagram of the hollow turbine and worm gear structure of the present invention; Figure 5 This is a schematic diagram of the drive mechanism of the present invention; Figure 6 For the present invention Figure 5 Schematic diagram of the structure at point A in the diagram; Figure 7 For the present invention Figure 5 Schematic diagram of the structure at point B in the diagram; Figure 8 This is a schematic diagram of the clamping mechanism of the present invention; Figure 9 This is a cross-sectional view of the clamping mechanism of the present invention; Figure 10 This is a schematic diagram of the exploded structure of the clamping mechanism of the present invention.

[0018] The meanings of the reference numerals in the diagram are as follows: 1: Support platform, 11: Frame 1, 12: Frame 2, 121: Wedge groove, 2: Telescopic frame, 21: Cylinder, 22: Support frame, 23: Sliding frame, 3: Hollow turbine, 31: Fixed frame, 32: Elastic rod, 33: Rubber wheel, 4: Laser welding gun, 5: Motor, 51: Lead screw, 52: Worm gear, 6: Irregular frame, 61: Elastic element, 7: Opening nut, 71: L-shaped frame, 8: Locking frame, 81: Wedge block, 82: Steel wire rope, 9: Rectangular frame, 91: Rack, 92: Sliding block, 93: Gear, 94: Fixed cylinder, 941: Spiral groove, 95: Extrusion plate, 951: Ball bearing. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1 A laser welding device for aluminum profile processing, such as Figures 1-5 As shown, the system includes a support platform 1, on which a frame 11 is fixedly installed. A telescopic frame 2 is installed on the frame 11, and a cylinder 21 is installed on the frame 11. The telescopic end of the cylinder 21 is fixedly connected to the telescopic end of the telescopic frame 2. A rotary welding mechanism is provided on the telescopic frame 2 for rotary welding of aluminum profiles. A second frame 12 is fixedly installed at the bottom of the support platform 1. A drive mechanism is provided on the second frame 12 for driving the rotary welding mechanism to rotate. A symmetrically sliding irregular frame 6 is provided on the support platform 1. A clamping mechanism is provided on the irregular frame 6 for clamping and positioning the aluminum profile.

[0021] like Figures 2-4 As shown, the rotary welding mechanism includes a hollow turbine 3, a support frame 22 symmetrically slidably mounted on the support platform 1, and a sliding frame 23 symmetrically fixed to the bottom. The hollow turbine 3 is rotatably mounted on the support frame 22 and the sliding frame 23. The telescopic frame 2 is rotatably connected to the hollow turbine 3. A fixed frame 31 is fixedly mounted inside the hollow turbine 3. An elastic rod 32 is slidably connected to the fixed frame 31. A rubber wheel 33 is rotatably mounted inside the elastic rod 32. A laser welding gun 4 is slidably mounted through the fixed frame 31. The elastic rod 32 is connected to the laser welding gun 4. The laser welding gun 4 is connected to external welding equipment.

[0022] like Figures 4-6 As shown, the drive mechanism includes a lead screw 51, which is rotatably mounted on the frame 12. A worm gear 52 is mounted in the middle of the lead screw 51 and meshes with the hollow turbine 3. A motor 5 is mounted on the support platform 1, and the output shaft of the motor 5 is fixedly connected to the lead screw 51. A rectangular slot is provided on the irregular frame 6, and a nut 7 is slidably connected in the rectangular slot. The nut 7 is threadedly connected to the lead screw 51.

[0023] like Figures 5-6 As shown, it also includes an L-shaped frame 71. The L-shaped frame 71 is fixedly connected to the opening and closing nut 7. The L-shaped frame 71 is vertically slidably connected to the rectangular groove of the irregular frame 6, and a first spring is connected between them.

[0024] like Figures 5-6 As shown, a wedge-shaped groove 121 is provided on the frame 2 12, and one side of the L-shaped frame 71 is set as an inclined surface. The L-shaped frame 71 and the wedge-shaped groove 121 cooperate to separate the opening and closing nut 7. After the opening and closing nut 7 is separated, it is disengaged from the threaded connection with the lead screw 51.

[0025] like Figures 5-7As shown, it also includes a locking frame 8. The locking frame 8 is symmetrically fixedly installed on one side of the irregular frame 6. The locking frame 8 has several limiting grooves. The frame 2 12 has through holes that are compatible with the locking frame 8. A wedge block 81 is vertically slidably connected inside the frame 2 12, and a second spring is connected between them. The wedge block 81 cooperates with the several limiting grooves on the locking frame 8 to limit the movement of the irregular frame 6.

[0026] like Figures 5-7 As shown, it also includes a steel wire rope 82, which is fixedly connected to the wedge block 81. The steel wire rope 82 passes through the frame 2 12 and is slidably connected to the frame 2 12. The steel wire rope 82 is in contact with the sliding frame 23. An elastic element 61 is connected between the irregular frame 6 and the frame 2 12.

[0027] like Figures 8-10 As shown, the clamping mechanism includes a rectangular frame 9, which is symmetrically fixed to the irregular frame 6. A rack 91 is installed on the rectangular frame 9. A slotted groove is opened on the rectangular frame 9. A sliding block 92 is slidably connected in the slotted groove. A gear 93 is rotatably connected to the sliding block 92. The gear 93 meshes with the rack 91.

[0028] like Figure 8-10 As shown, the clamping mechanism also includes a fixed cylinder 94, which is fixedly connected to the gear 93. A pressing plate 95 is slidably connected inside the fixed cylinder 94. An anti-slip strip is provided at one end of the pressing plate 95. A third spring is provided between the fixed cylinder 94 and the pressing plate 95. A spiral groove 941 is opened inside the fixed cylinder 94. A ball bearing 951 is rotatably connected to one end of the pressing plate 95. The ball bearing 951 cooperates with the spiral groove 941.

[0029] The specific implementation of this device is as follows: When aluminum profiles need to be processed, the operator places the aluminum profiles onto the support platform 1. Initially, the hollow turbine 3 and worm gear 52 are separated, and the cylinder 21 is in a retracted state. The telescopic end of the telescopic frame 2 drives the hollow turbine 3 to be positioned above the worm gear 52, and the sliding frame 23 drives the wire rope 82 to be in a taut state. The wedge block 81 is located within the frame 12. At this time, the operator places the two aluminum profiles to be welded onto the support platform 1 and simultaneously places the two aluminum profiles to be welded between the two symmetrical extrusion plates 95. Then, the motor is started. 5. The output shaft of motor 5 drives the lead screw 51 to rotate. In the initial state, the opening and closing nut 7 is in a closed state due to the elastic force of the first spring. When the lead screw 51 rotates, it drives the opening and closing nut 7 to move. The opening and closing nut 7 drives the irregular frame 6 to slide along the support platform 1, so that the two symmetrical irregular frames 6 drive the clamping mechanism to slide closer to each other. When the symmetrical extrusion plate 95 contacts the aluminum profile during its movement, it clamps and positions the two aluminum profiles respectively. At this time, motor 5 continues to drive the lead screw 51 to rotate, so that the irregular frame 6 applies pressure to the extrusion plate 95 again through the rectangular frame 9. When the symmetrical extrusion plate 95 is subjected to Upon reaching relative pressure, the balls 951 on the extrusion plate 95 further press the spiral groove 941. The spiral groove 941, under the rolling pressure of the balls 951, generates rotational torque in the fixed cylinder 94. Simultaneously, the extrusion plate 95 compresses the third spring. When the fixed cylinder 94 rotates, it drives the gear 93 to rotate. As the gear 93 rotates, it rotates to one side along the rack 91. Simultaneously, the rotation of the gear 93 drives the sliding block 92 to slide on the slotted groove within the rectangular frame 9. When the fixed cylinder 94 drives the gear 93 to rotate, it drives the extrusion plate 95 to move synchronously. The symmetrical extrusion plates 95 move and press the two aluminum profiles closer together and align them. At this point, the two... Two aluminum profiles are located inside the hollow turbine 3, and are perpendicular to the rubber wheel 33 and the laser welding gun 4. The lead screw 51 drives the shaped frame 6 to move closer to each other, and then the rectangular frame 9 drives the extrusion plate 95 to clamp and position the aluminum profiles, thereby realizing the positioning function of the aluminum profiles. At the same time, as the lead screw 51 continues to drive the shaped frame 6 to move closer to each other, the ball bearing 951 and the spiral groove 941 cooperate to drive the fixed cylinder 94 to drive the gear 93 to move laterally. At the same time, the extrusion plate 95 drives the aluminum profiles to move laterally, so that the two aluminum profiles can automatically align at both ends and improve processing efficiency.

[0030] When the lead screw 51 rotates, it drives the opening and closing nut 7 to move. The opening and closing nut 7 drives the irregular frame 6 to move closer to each other. At the same time, the L-shaped frame 71 moves synchronously with the opening and closing nut 7. When the L-shaped frame 71 moves and contacts the wedge groove 121 on the second frame 12, the L-shaped frame 71 is pressed and slides along the rectangular groove in the irregular frame 6. At this time, the first spring is compressed. When the L-shaped frame 71 slides away from each other, it drives the opening and closing nut 7 to separate. At the same time, the opening and closing nut 7 is disengaged from the lead screw 51, so that the opening and closing nut 7 no longer drives the irregular frame 6 to slide. At this time, the two aluminum profiles to be welded are in a parallel and aligned state. When the irregular frame 6 moves closer to each other, it drives the locking frame 8 to move closer to the side of the second frame 12 and penetrates the through hole on the second frame 12, thereby compressing the elastic element 61. At the same time, the cylinder 21 is activated. The telescopic end extends and drives the telescopic frame 2 to move downward. At the same time, the telescopic frame 2 drives the hollow turbine 3 to move downward and engage with the worm gear 52. When the hollow turbine 3 moves downward, it drives the support frame 22 to move away from each other and slide on the support platform 1. At the same time, the sliding frame 23 at the bottom follows the hollow turbine 3 and moves downward. When the sliding frame 23 moves downward, it drives the wire rope 82 to move downward. At this time, the second spring drives the wedge block 81 to reset. The wedge block 81 resets and is embedded in the limiting groove of the locking frame 8. The wire rope 82 is released by the downward movement of the sliding frame 23, which in turn causes the second spring to drive the wedge block 81 to move downward and contact the limiting groove of the locking frame 8. The movement of the locking frame 8 is restricted by the wedge block 81, and the movement of the clamping mechanism is restricted by the special frame 6. At the same time, it can achieve stability when welding two aluminum profiles and prevent misalignment when welding two aluminum profiles.

[0031] When the hollow turbine 3 moves downward, it drives the fixed frame 31 to move, thereby causing the elastic rod 32 to move synchronously with the laser welding gun 4. After the elastic rod 32 moves, it drives the rubber wheel 33 to contact the surfaces of the two aluminum profiles. The rubber wheel 33 can be adapted to aluminum profiles of different diameters through the elastic rod 32, thereby adjusting the contact between the laser welding gun 4 and the surfaces of the two aluminum profiles. When the lead screw 51 drives the worm gear 52 to rotate, the worm gear 52 drives the hollow turbine 3 to rotate around the circumference of the two aluminum profiles. At the same time, the rubber wheel 33 always maintains contact with the aluminum profiles, and can realize the function of the laser welding gun 4 to weld square aluminum profiles in a ring.

[0032] When the welding of the two aluminum profiles is completed, the control cylinder 21 drives the telescopic frame 2 to reset, which in turn causes the hollow turbine 3 to separate from the worm gear 52, thereby causing the rubber wheel 33 and the laser welding gun 4 to detach from the two aluminum profiles. When the hollow turbine 3 slides upward, it drives the support frame 22 to slide closer to each other along the support platform 1. At this time, the sliding frame 23 at the bottom moves upward with the hollow turbine 3. When the sliding frame 23 moves upward, it drives the wire rope 82 to move upward. After the wire rope 82 moves, it drives the wedge block 81 to move upward, thereby compressing the second spring. As the wedge block 81 moves upward and disengages from the limiting groove on the locking frame 8, the locking frame 8 is no longer restricted by the wedge block 81. The elastic element 61 then releases and drives the irregular frame 6 to move away from the side of the frame 12. This, in turn, causes the opening and closing nut 7 to disengage via the irregular frame 6. When the opening and closing nut 7 moves, it causes the L-shaped frame 71 to disengage from the wedge groove 121. Simultaneously, the first spring drives the opening and closing nut 7 to close and connect with the lead screw 51. At the same time, it controls the rotation of the motor 5, causing the lead screw 51 to rotate and drive the opening and closing nut 7 to move. This, in turn, causes the irregular frame 6 to... When the shaped frames 6 slide away from each other, and no longer exert pressure on the extrusion plate 95, the third spring resets and drives the extrusion plate 95 to slide within the fixed cylinder 94. As the extrusion plate 95 slides, it drives the ball bearing 951 to slide along the spiral groove 941, thereby causing the fixed cylinder 94 to drive the gear 93 to rotate to one side. It should be noted that when the shaped frame 6 drives the extrusion plate 95 to detach from the welded aluminum profile, the extrusion plate 95 is in a free state and is no longer restricted by the aluminum profile. At the same time, the reset of the third spring drives the extrusion plate 95 to slide along the fixed cylinder 94, thereby causing the ball bearing 951 to rotate along the spiral groove 941, and then the ball bearing 951 drives the extrusion plate 95 to rotate. At this time, the gear 93 drives the fixed cylinder 94 to not reset to the initial state. At the same time, the motor 5 is stopped, the welded aluminum profile is removed, and a new aluminum profile to be welded is put in. When putting in the new aluminum profile, the operator first moves the fixed cylinder 94, which has not been reset to the initial state, to the initial state, and then repeats the above steps to weld the new aluminum profile.

[0033] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A laser welding device for aluminum profile processing, characterized in that: The system includes a support platform (1), on which a frame (11) is mounted, on which a telescopic frame (2) is mounted, on which a cylinder (21) is mounted, the telescopic end of which is connected to the telescopic frame (2), on which a rotary welding mechanism is provided, and a frame (12) is mounted at the bottom of the support platform (1), on which a driving mechanism is provided, the driving mechanism being used to drive the rotary welding mechanism to move, and a special-shaped frame (6) is slidably mounted on the support platform (1), on which a clamping mechanism is provided, the clamping mechanism being used to clamp and position the aluminum profile.

2. The laser welding device for aluminum profile processing according to claim 1, characterized in that: The rotary welding mechanism includes a hollow turbine (3), a support frame (22) and a sliding frame (23) are provided on the support platform (1), the hollow turbine (3) is rotatably provided on the support frame (22) and the sliding frame (23), the telescopic frame (2) is rotatably connected to the hollow turbine (3), a fixed frame (31) is installed inside the hollow turbine (3), an elastic rod (32) is slidably connected on the fixed frame (31), a rubber wheel (33) is rotatably provided inside the elastic rod (32), a laser welding gun (4) is slidably installed through the fixed frame (31), and the elastic rod (32) is connected to the laser welding gun (4).

3. The laser welding device for aluminum profile processing according to claim 2, characterized in that: The drive mechanism includes a lead screw (51), which is rotatably mounted on the second frame (12). A worm gear (52) is provided in the middle of the lead screw (51), and the worm gear (52) meshes with the hollow turbine (3). A motor (5) is mounted on the support platform (1), and the output shaft of the motor (5) is connected to the lead screw (51). A rectangular slot is provided on the special frame (6), and a nut (7) is slidably connected in the rectangular slot. The nut (7) is threadedly connected to the lead screw (51).

4. The laser welding device for aluminum profile processing according to claim 3, characterized in that: It also includes an L-shaped frame (71), and each of the opening and closing nuts (7) is connected to an L-shaped frame (71). The L-shaped frame (71) is slidably connected to the rectangular groove of the irregular frame (6), and a first spring is connected between them.

5. The laser welding device for aluminum profile processing according to claim 4, characterized in that: The frame 2 (12) has a wedge groove (121) and one side of the L-shaped frame (71) is set as an inclined surface. The L-shaped frame (71) and the wedge groove (121) cooperate to separate the opening and closing nut (7).

6. The laser welding device for aluminum profile processing according to claim 4, characterized in that: It also includes a locking frame (8), on one side of the irregular frame (6) the locking frame (8) is symmetrically installed, the locking frame (8) has a limit groove, the frame two (12) has a through hole adapted to the locking frame (8), the frame two (12) has a wedge block (81) slidably connected inside the frame two (12) and a second spring connected between them, the wedge block (81) cooperates with the limit groove on the locking frame (8).

7. The laser welding device for aluminum profile processing according to claim 6, characterized in that: It also includes a steel wire rope (82), which is fixed on the wedge block (81). The steel wire rope (82) passes through the second frame (12). The steel wire rope (82) cooperates with the sliding frame (23). An elastic element (61) is connected between the irregular frame (6) and the second frame (12).

8. The laser welding device for aluminum profile processing according to claim 1, characterized in that: The clamping mechanism includes a rectangular frame (9), which is symmetrically fixed to the irregular frame (6). A rack (91) is provided on the rectangular frame (9). A slotted groove is provided on the rectangular frame (9). A sliding block (92) is slidably connected in the slotted groove. A gear (93) is rotatably connected on the sliding block (92). The gear (93) meshes with the rack (91).

9. The laser welding device for aluminum profile processing according to claim 8, characterized in that: The clamping mechanism also includes a fixed cylinder (94), which is provided on the gear (93). A pressing plate (95) is slidably connected inside the fixed cylinder (94), and a third spring is provided between the fixed cylinder (94) and the pressing plate (95).

10. The laser welding device for aluminum profile processing according to claim 9, characterized in that: The fixed cylinder (94) has a spiral groove (941) inside, and one end of the extrusion plate (95) is rotatably connected to a ball (951), which cooperates with the spiral groove (941).

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