Automatic alignment welding machine

Abstract

The utility model belongs to the technical field of vacuum cup welding machines, and particularly relates to an automatic alignment welding machine which comprises a rack. The inner container clamping mechanism is arranged on the upper portion of the machine frame, and the inner container clamping mechanism comprises an inner container rotating assembly. The shell clamping mechanism is arranged on the lower portion of the rack, and the shell clamping mechanism comprises a shell lifting assembly, a shell rotating assembly and a shell angle detecting assembly; wherein the inner container rotating assembly is used for clamping an inner container and placing the inner container at a set angle; the shell rotating assembly is used for clamping a shell and is matched with the shell angle detection assembly to place the shell at a set angle; the shell lifting assembly is used for pushing the shell upwards so that the inner container and the shell can be spliced in an aligned mode.

Description

TECHNICAL FIELD

[0001] The technical scheme relates to the technical field of vacuum cup welding machines, and particularly relates to an automatic alignment welding machine. BACKGROUND

[0002] In the production of vacuum cups, the inner container and the outer shell need to be welded together. The working process of the existing vacuum cup welding machine is as follows: first, the inner container and the outer shell are positioned by a mold; then, the outer shell is sleeved on the outer container by lifting the mold; finally, the connecting seam is welded by a welding gun.

[0003] A vacuum cup inner container welding device is disclosed in Chinese Patent CN216758646U. With the improvement of people's living quality, users have higher requirements for the practicality and comfort of vacuum cups. For example, when the vacuum cup cover is tightened, the orientation of the vacuum cup cover and the orientation of the carrying handle on the outer shell need to be located at specific positions, so that the comfort of the user will be improved. To achieve this effect, the inner container and the outer shell need to be matched to form a specific angle when welding the inner container and the outer shell. However, the existing vacuum cup welding machine does not have this function. SUMMARY

[0004] The purpose of the technical scheme is to provide an automatic alignment welding machine. The inner container is placed at a set angle by the inner container rotating assembly, and the outer shell is placed at a set angle by the outer shell rotating assembly in cooperation with the outer shell angle detection assembly, thereby solving the problem that the original equipment cannot realize directional welding of the inner container and the outer shell.

[0005] The purpose of the technical scheme is achieved as follows:

[0006] An automatic alignment welding machine comprises a rack, an inner container clamping mechanism arranged on the upper part of the rack, the inner container clamping mechanism comprising an inner container rotating assembly, and an outer shell clamping mechanism arranged on the lower part of the rack, the outer shell clamping mechanism comprising an outer shell lifting assembly, an outer shell rotating assembly and an outer shell angle detection assembly. The inner container rotating assembly is used for clamping the inner container and placing the inner container at a set angle. The outer shell rotating assembly is used for clamping the outer shell and placing the outer shell at a set angle in cooperation with the outer shell angle detection assembly. The outer shell lifting assembly is used for pushing the outer shell upwards so that the inner container and the outer shell are aligned and spliced.

[0007] Preferably, the inner container clamping mechanism comprises an inner container rotating assembly arranged on the upper end of the rack for controlling the rotation of the inner container, an inner container lifting assembly arranged on the middle part of the rack for controlling the lifting of the inner container, and an inner container clamping assembly arranged on the inner container lifting assembly for clamping the inner container.

[0008] Preferably, the inner liner rotating assembly includes: an inner liner rotating drive component, the output end of which is provided with an inner liner rotating drive wheel; an inner liner rotating shaft, which passes through the frame and has an inner liner rotating driven wheel at its upper end; an inner liner rotating belt, which is sleeved on the inner liner rotating drive wheel and the inner liner rotating driven wheel; and an inner liner clamping part, which is provided at the lower end of the inner liner rotating shaft; wherein, the inner liner clamping part is provided with threads on its periphery; the inner liner rotating drive component controls the rotation of the inner liner clamping part through the inner liner rotating shaft, so that the inner liner is threadedly connected to the inner liner clamping part.

[0009] Preferably, the inner liner lifting assembly includes: an inner liner lifting drive component, which is fixedly mounted on the frame and has an inner liner lifting screw at its output end; an inner liner lifting bushing, which is threaded onto the inner liner lifting screw; an inner liner lifting transmission block, which is mounted on the inner liner lifting bushing and has a lifting insertion hole at its front end; an inner liner lifting transmission rod, which is inserted into the lifting insertion hole and is fitted with a buffer spring; and an inner liner lifting plate, which is mounted on the inner liner lifting transmission rod; wherein the upper end of the buffer spring abuts against the lower end face of the inner liner lifting plate, and the lower end abuts against the inner liner lifting transmission block; the two ends of the inner liner lifting plate are movably mounted on the frame via inner liner lifting guides.

[0010] Preferably, the inner liner clamping assembly includes: an inner liner clamping base disposed on the back side of the inner liner lifting plate; an inner liner clamping drive unit disposed on the inner liner clamping base, and having an inner liner clamping screw at its output end; two opposing inner liner clamping bushings threaded onto the inner liner clamping screw; two inner liner clamping sliders disposed on corresponding inner liner clamping bushings via inner liner clamping connectors and located on the front side of the inner liner lifting plate; and two inner liner clamping parts disposed on corresponding inner liner clamping sliders.

[0011] Specifically, the inner liner clamping screw has threads arranged in opposite directions at both ends, and two inner liner clamping bushings are respectively placed on the corresponding threads. When the inner liner clamping screw rotates, the two inner liner clamping bushings move closer or further away synchronously to achieve clamping of the inner liner by the inner liner clamping part.

[0012] Preferably, the housing clamping mechanism further includes a housing clamping assembly, which includes: a housing clamping base; a housing clamping drive member disposed on the housing clamping base; and housing clamping claws movably disposed above the housing clamping base and connected to the output end of the housing clamping drive member; wherein, the housing clamping claws form a clamping position between themselves.

[0013] Preferably, the housing lifting assembly includes: a housing lifting drive component, the output end of which is provided with a housing lifting drive wheel; a housing lifting screw, which passes through the frame and has a housing lifting driven wheel at its lower end; a housing lifting belt, which is sleeved on the housing lifting drive wheel and the housing lifting driven wheel; and a housing lifting plate, which is mounted on the housing lifting screw via a housing lifting bushing; wherein, the housing clamping base is mounted on the housing lifting plate via a housing clamping guide post.

[0014] Preferably, the housing rotation assembly includes: a housing rotation drive member disposed on the housing clamping base and having a housing rotation drive wheel at its output end; a housing rotation shaft passing through the housing clamping base and having a housing rotation driven wheel sleeved on it; and a housing rotation belt sleeved on the housing rotation drive wheel and the housing rotation driven wheel.

[0015] Preferably, two inner liner clamping mechanisms and an outer shell clamping mechanism are symmetrically arranged on the frame.

[0016] The key and beneficial technical effects of this technical solution compared to existing technologies are:

[0017] 1. The inner liner rotating assembly designed in this technical solution can rotate the inner liner by a specific angle, so that each inner liner starts welding at the same angle. The outer shell rotating assembly and the outer shell angle detection assembly work together to rotate the outer shell by a specific angle, so that each outer shell starts welding at the same angle.

[0018] 2. The inner liner clamping component designed in this technical solution can clamp the inner liner, and then the inner liner lifting component carries the inner liner to rise until the inner liner clamping part enters the inner liner opening. The inner liner rotating component rotates to make the inner liner threadedly connected to the inner liner clamping part. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this technical solution.

[0020] Figure 2 This is a schematic diagram of the inner liner rotating assembly.

[0021] Figure 3 This is a schematic diagram of the inner liner lifting assembly and the inner liner clamping assembly.

[0022] Figure 4 This is a structural schematic diagram of the housing lifting assembly.

[0023] Figure 5 This is a schematic diagram of the housing clamping assembly and the housing rotating assembly.

[0024] Reference numerals: 1. Frame; 2. Inner liner clamping mechanism; 3. Outer shell clamping mechanism; 4. Inner liner rotating assembly; 41. Inner liner rotating drive component; 42. Inner liner rotating drive wheel; 43. Inner liner rotating shaft; 44. Inner liner rotating driven wheel; 45. Inner liner rotating belt; 46. Inner liner clamping part; 5. Inner liner lifting assembly; 51. Inner liner lifting drive component; 52. Inner liner lifting screw; 53. Inner liner lifting bushing; 54. Inner liner lifting transmission block; 55. Inner liner lifting transmission rod; 56. Buffer spring; 57. Inner liner lifting plate; 58. Inner liner lifting guide part; 6. Inner liner clamping assembly; 61. Inner liner clamping base; 62. Inner liner clamping drive component; 63. Inner liner clamping screw; 64. Inner liner clamping shaft 65. Inner liner clamping slider; 66. Inner liner clamping connector; 67. Inner liner clamping part; 7. Outer shell lifting assembly; 71. Outer shell lifting drive component; 72. Outer shell lifting drive wheel; 73. Outer shell lifting screw; 74. Outer shell lifting driven wheel; 75. Outer shell lifting belt; 76. Outer shell lifting plate; 77. Outer shell lifting bushing; 78. Outer shell clamping guide post; 8. Outer shell rotating assembly; 81. Outer shell rotating drive component; 82. Outer shell rotating drive wheel; 83. Outer shell rotating shaft; 84. Outer shell rotating driven wheel; 85. Outer shell rotating belt; 9. Outer shell clamping assembly; 91. Outer shell clamping base; 92. Outer shell clamping drive component; 93. Outer shell clamping claw; 10. Outer shell angle detection assembly. Detailed Implementation

[0025] The specific implementation of this technical solution will be further described in detail below with reference to the accompanying drawings.

[0026] like Figure 1 As shown, an automatic alignment welding machine includes a frame 1, an inner liner clamping mechanism 2, and an outer shell clamping mechanism 3. The inner liner clamping mechanism 2 is located on the upper part of the frame 1 and includes an inner liner rotating assembly 4 for controlling the rotation of the inner liner. The outer shell clamping mechanism 3 is located on the lower part of the frame 1 and includes an outer shell lifting assembly 7, an outer shell rotating assembly 8, and an outer shell angle detection assembly 10. The outer shell lifting assembly 7 is used to control the lifting of the outer shell, the outer shell rotating assembly 8 is used to control the rotation of the outer shell, and the outer shell angle detection assembly 10 is used to detect the angle at which the outer shell is placed.

[0027] Specifically, before conveying the outer shell upwards to the inner liner, the angles of the inner liner and the outer shell need to be adjusted. The inner liner angle is adjusted by rotating the inner liner rotating component 4 by a set angle after each clamping of the inner liner. The outer liner angle is adjusted by detecting the outer shell angle using the outer shell angle detection component 10, and then controlling the outer shell rotating component 8 to rotate by a set angle. In this way, the outer shell and the inner liner are spliced ​​at a specific angle, and then welded together. The purpose of welding the outer shell and the inner liner at a specific angle includes, but is not limited to, forming trademarks, patterns or stickers on the outer shell in a designated position, and placing the thermos lid at a specific position at the opening of the inner liner when tightened.

[0028] Furthermore, the peripheral surface of the housing has a detection area, which includes, but is not limited to, patterns, stickers, or other components. The housing angle detection component 10 detects the housing position in ways including, but not limited to, detecting the detection area by infrared light, visual inspection device, or laser reflection.

[0029] like Figure 2 and Figure 3 As shown, the inner liner clamping mechanism 2 includes an inner liner rotating assembly 4, an inner liner lifting assembly 5, and an inner liner clamping assembly 6. The inner liner rotating assembly 4 includes an inner liner rotating drive 41, an inner liner rotating drive wheel 42, an inner liner rotating shaft 43, an inner liner rotating driven wheel 44, an inner liner rotating belt 45, and an inner liner clamping part 46. The inner liner rotating drive wheel 42 is located at the output end of the inner liner rotating drive 41. The inner liner rotating shaft 43 passes through the frame 1. The inner liner rotating driven wheel 44 is sleeved on the inner liner rotating shaft 43. The inner liner rotating belt 45 is sleeved outside the inner liner rotating drive wheel 42 and the inner liner rotating driven wheel 44. The inner liner clamping part is located at the lower end of the inner liner rotating shaft 43. The inner liner clamping part 46 has threads on its periphery. The inner liner rotating drive 41 controls the rotation of the inner liner clamping part 46 through the inner liner rotating shaft 43. When the inner liner is fixed, the rotation of the inner liner clamping part 46 allows the inner liner to be threadedly connected to the inner liner clamping part 46.

[0030] Furthermore, the inner liner lifting assembly 5 includes an inner liner lifting drive 51, an inner liner lifting screw 52, ​​an inner liner lifting bushing 53, an inner liner lifting transmission block 54, an inner liner lifting transmission rod 55, a buffer spring 56, and an inner liner lifting plate 57. The inner liner lifting drive 51 is fixedly mounted on the frame 1. The inner liner lifting screw 52 is located at the output end of the inner liner lifting drive 51, and the inner liner lifting drive 51 can drive the inner liner lifting screw 52 to rotate. The inner liner lifting bushing 53 is threaded onto the outer side of the inner liner lifting screw 52. The inner liner lifting transmission block 54 is connected to the inner liner... The lifting bushing 53 is fixedly connected, and the front end of the inner liner lifting transmission block 54 has a lifting insertion hole. The lower end of the inner liner lifting transmission rod 55 is inserted into the lifting insertion hole and is limited in the lifting insertion hole by a plug. The upper end of the inner liner lifting transmission rod 55 is fixedly connected to the inner liner lifting plate 57. At the same time, a buffer spring 56 is provided on the inner liner lifting transmission rod 55. The upper end of the buffer spring 56 abuts against the lower end face of the inner liner lifting plate 57, and the lower end abuts against the inner liner lifting transmission block 54. The two ends of the inner liner lifting plate 57 are movably mounted on the frame 1 through the inner liner lifting guide part 58.

[0031] Specifically, when the inner liner lifting screw 52 rotates, it works with the inner liner lifting bushing 53 to control the lifting of the inner liner lifting transmission block 54 through the thread action. When the buffer spring 56 is compressed, it will push the inner liner lifting plate 57 upward, thereby driving the inner liner clamping assembly 6 to carry the inner liner closer to the inner liner rotating assembly 4. The buffer spring 56 can effectively buffer the collision generated when the inner liner contacts the inner liner clamping part 46, avoiding damage to the inner liner. At the same time, the buffer spring 56 can also assist the inner liner lifting plate 57 to descend, saving the power of the inner liner lifting drive component 51.

[0032] Furthermore, the inner liner clamping assembly 6 includes an inner liner clamping base 61, an inner liner clamping drive 62, an inner liner clamping screw 63, an inner liner clamping bushing 64, an inner liner clamping slider 65, and an inner liner clamping part 67. The inner liner clamping base 61 is disposed on the back side of the inner liner lifting plate 57. The inner liner clamping drive 62 is disposed on the inner liner clamping base 61 and has an inner liner clamping screw 63 at its output end. Two opposing inner liner clamping bushings 64 are threaded onto the inner liner clamping screw 63. Two inner liner clamping sliders 65 are disposed on the corresponding inner liner clamping bushings 64 via inner liner clamping connectors 66 and are located on the front side of the inner liner lifting plate 57. Two inner liner clamping parts 67 are disposed on the corresponding inner liner clamping sliders 65. The inner liner clamping screw 63 has threads arranged in opposite directions at both ends. The two inner liner clamping bushings 64... The inner liner clamping components 6 and 67 are respectively placed on the corresponding threads. When the inner liner clamping screw 63 rotates, the two inner liner clamping bushings 64 move closer or further away synchronously to achieve the clamping of the inner liner by the inner liner clamping part 67. The inner liner clamping component 6 includes an inner liner clamping drive 62, an inner liner clamping screw 63, an inner liner clamping bushing 64, an inner liner clamping slider 65, and an inner liner clamping part 67. The inner liner clamping screw 63 is located at the output end of the inner liner clamping drive 62. The inner liner clamping bushing 64 is threaded on the outer side of the inner liner clamping screw 63. The inner liner clamping slider 65 is located on the inner liner clamping bushing 64 through the inner liner clamping connector 66. The inner liner clamping part 67 is located on the inner liner clamping slider 65. The inner liner clamping drive 62 can control the horizontal movement of the inner liner clamping part 67 to achieve the clamping of the inner liner. After the inner liner clamping component 6 stably clamps the inner liner, the inner liner lifting component 5 lifts and lowers the inner liner.

[0033] like Figure 4 and Figure 5 As shown, the housing clamping mechanism 3 also includes a housing clamping assembly 9. The housing clamping assembly 9 includes a housing clamping base 91, a housing clamping drive 92, and a housing clamping claw 93. The housing clamping drive 92 is disposed on the housing clamping base 91. The housing clamping claw 93 is movably disposed above the housing clamping base 91 and connected to the output end of the housing clamping drive 92. A clamping position is formed between the housing clamping claws 93. When clamping the housing, the housing clamping claws 93 can surround the periphery of the housing. If the housing is not accurately placed in the center of the clamping position, the housing clamping claws 93 can be gradually moved towards the center to adjust the position of the housing.

[0034] Furthermore, the outer casing lifting assembly 7 includes an outer casing lifting drive 71, an outer casing lifting drive wheel 72, an outer casing lifting screw 73, an outer casing lifting driven wheel 74, an outer casing lifting belt 75, and an outer casing lifting plate 76. The outer casing lifting drive wheel 72 is located at the output end of the outer casing lifting drive 71. The outer casing lifting screw 73 passes through the frame 1. The outer casing lifting driven wheel 74 is located at the lower end of the outer casing lifting screw 73. The outer casing lifting belt 75 is sleeved around the outer casing lifting drive wheel 72 and the outer casing lifting driven wheel 74. The outer casing lifting plate 76 is mounted on the outer casing lifting screw 73 through an outer casing lifting bushing 77. The outer casing clamping base 91 is mounted on the outer casing lifting plate 76 through an outer casing clamping guide post 78. When the outer casing lifting plate 76 is raised or lowered, the outer casing clamping base 91 can be raised or lowered synchronously.

[0035] Furthermore, the housing rotation assembly 8 includes a housing rotation drive 81, a housing rotation drive wheel 82, a housing rotation shaft 83, a housing rotation driven wheel 84, and a housing rotation belt 85. The housing rotation drive 81 is mounted on the housing clamping base 91, the housing rotation drive wheel 82 is mounted on the output end of the housing rotation drive 81, the housing rotation shaft 83 passes through the housing clamping base 91, the housing rotation driven wheel 84 is sleeved on the housing rotation shaft 83, and the housing rotation belt 85 is sleeved on the housing rotation drive wheel 82 and the housing rotation driven wheel 84. The housing rotation drive 81 can control the rotation of the housing clamping base 91 through the housing rotation shaft 83.

[0036] like Figure 1 As shown, the welding machine has two workstations, and two inner liner clamping mechanisms 2 and outer shell clamping mechanisms 3 are symmetrically arranged on the frame 1.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of this technical solution. Those skilled in the art should understand that this technical solution is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this technical solution. Various changes and modifications can be made to this technical solution without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed technical solution. The scope of protection of this technical solution is defined by the appended claims and their equivalents.

Claims

1. An automatic alignment welding machine, characterized in that, include: Rack (1); An inner liner clamping mechanism (2) is disposed on the upper part of the frame (1). The inner liner clamping mechanism (2) includes an inner liner rotating assembly (4), an inner liner lifting assembly (5), and an inner liner clamping assembly (6); and The outer shell clamping mechanism (3) is disposed at the lower part of the frame (1). The outer shell clamping mechanism (3) includes an outer shell lifting assembly (7), an outer shell rotating assembly (8), and an outer shell angle detection assembly (10). The inner liner clamping assembly (6) is used to clamp the inner liner, and the inner liner lifting assembly (5) is used to control the lifting of the inner liner clamping assembly (6). When the inner liner is located at the lower end of the inner liner clamping part (46) of the inner liner rotating assembly (4), the inner liner rotating assembly (4) controls the inner liner clamping part (46) with threads to rotate so as to achieve threaded engagement with the inner wall of the inner liner and fix the inner liner on the inner liner clamping part (46). The inner liner rotating assembly (4) is also used to place the inner liner at a set angle. The outer shell rotation assembly (8) is used to clamp the outer shell and, in conjunction with the outer shell angle detection assembly (10), to place the outer shell at a set angle; The outer shell lifting assembly (7) is used to push the outer shell upward so that the inner liner and the outer shell are aligned and spliced.

2. The automatic alignment welding machine according to claim 1, characterized in that, The inner liner rotating assembly (4) includes: The inner liner rotation drive (41) has an inner liner rotation drive wheel (42) at its output end; The inner liner rotating shaft (43) is mounted on the frame (1) and has an inner liner rotating driven wheel (44) at its upper end; The inner liner rotating belt (45) is sleeved on the inner liner rotating drive pulley (42) and the inner liner rotating driven pulley (44); and The inner liner clamping part (46) is located at the lower end of the inner liner rotating shaft (43); The inner liner clamping part (46) is provided with threads on its periphery; The inner liner rotation drive (41) controls the rotation of the inner liner clamping part (46) through the inner liner rotation shaft (43), so that the inner liner is threadedly connected to the inner liner clamping part (46).

3. An automatic alignment welding machine according to claim 2, characterized in that, The inner liner lifting assembly (5) includes: The inner liner lifting drive (51) is fixedly mounted on the frame (1), and the output end is provided with an inner liner lifting screw (52); The inner liner lifting bushing (53) has its threads sleeved outside the inner liner lifting screw (52); The inner liner lifting transmission block (54) is sleeved outside the inner liner lifting bushing (53) and has a lifting insertion hole at the front end. The inner liner lifting transmission rod (55) is inserted into the lifting insertion hole and is fitted with a buffer spring (56); and The inner liner lifting plate (57) is mounted on the inner liner lifting transmission rod (55); The upper end of the buffer spring (56) abuts against the lower end face of the inner liner lifting plate (57), and the lower end abuts against the inner liner lifting transmission block (54). The inner liner lifting plate (57) is movably mounted on the frame (1) at both ends via the inner liner lifting guide (58).

4. An automatic alignment welding machine according to claim 3, characterized in that, The inner liner clamping assembly (6) includes: Inner liner clamping base (61) is disposed on the back side of the inner liner lifting plate (57); The inner liner clamping drive (62) is disposed on the inner liner clamping base (61) and the output end is provided with an inner liner clamping screw (63). The inner liner clamping screw (63) is threaded with two opposing inner liner clamping bushings (64). Two inner liner clamping sliders (65) are mounted on corresponding inner liner clamping bushings (64) via inner liner clamping connectors (66) and are located on the front of the inner liner lifting plate (57); and Two inner liner clamping parts (67) are provided on corresponding inner liner clamping sliders (65); The inner liner clamping screw (63) has threads arranged in opposite directions at both ends, and two inner liner clamping bushings (64) are respectively placed on the corresponding threads. When the inner liner clamping screw (63) rotates, the two inner liner clamping bushings (64) move closer or further away synchronously, so as to realize the clamping of the inner liner by the inner liner clamping part (67).

5. An automatic alignment welding machine according to claim 4, characterized in that: The housing clamping mechanism (3) further includes a housing clamping assembly (9), which includes: Shell clamping base (91); A housing clamping drive (92) is disposed on the housing clamping base (91); and The housing clamping claw (93) is movably disposed above the housing clamping base (91) and connected to the output end of the housing clamping drive (92); The outer shell clamping claws (93) form a clamping position between them.

6. An automatic alignment welding machine according to claim 5, characterized in that, The outer casing lifting assembly (7) includes: The outer casing lifting drive (71) has an outer casing lifting drive wheel (72) at its output end; The outer casing lifting screw (73) is mounted on the frame (1) and has an outer casing lifting driven wheel (74) at its lower end; A lifting belt (75) for the outer casing is fitted over the outer casing lifting drive pulley (72) and the outer casing lifting driven pulley (74); and The outer casing lifting plate (76) is mounted on the outer casing lifting screw (73) via the outer casing lifting bushing (77); The outer shell clamping base (91) is mounted on the outer shell lifting plate (76) via the outer shell clamping guide post (78).

7. An automatic alignment welding machine according to claim 6, characterized in that, The outer casing rotation assembly (8) includes: A housing rotation drive (81) is provided on the housing clamping base (91), and a housing rotation drive wheel (82) is provided at the output end; A housing rotation shaft (83) passes through the housing clamping base (91) and is fitted with a housing rotation driven wheel (84); and A housing rotating belt (85) is sleeved on the housing rotating drive pulley (82) and the housing rotating driven pulley (84).

8. An automatic alignment welding machine according to any one of claims 1-7, characterized in that: Two inner liner clamping mechanisms (2) and outer shell clamping mechanisms (3) are symmetrically arranged on the frame (1).

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