Laser cutting machine for conveyor scraper blade machining

Abstract

The invention discloses a laser cutting machine for conveyor scraper machining, and relates to the technical field of metal cutting equipment manufacturing. The laser cutting machine for conveyor scraper machining comprises a workbench, the top of the workbench is movably connected with a first moving device, the top of the first moving device is movably connected with a second moving device, and the outer wall of the second moving device is fixedly connected with an air cannon mechanism. According to the laser cutting machine for conveyor scraper machining, when an extrusion plate moves towards the interior of a gas bin, gas in the gas bin can be extruded, the gas enters a triangular bin through a limiting bin and a connecting bin, falling of the scraper is accelerated under the impact of airflow, and the situation that the machining efficiency is low due to the fact that the scraper is difficult to separate is avoided; and when the extrusion plate extrudes the gas again towards the gas bin, the gas in the gas bin can also be extruded to the first baffle plate, so that the first baffle plate is attached to the interior of the airflow hole again.

Description

Technical Field

[0001] The invention relates to the technical field of metal cutting equipment manufacturing, in particular to a laser cutting machine used for conveyor scraper processing. Background Art

[0002] Conveyor scraper processing is a process involving mechanical manufacturing and precision machining. The raw materials are processed into the basic shape of the scraper through the laser cutting process; The Chinese publication number cited is CN116810140A. This patent discloses a coil laser cutting machine, which relates to the technical field of metal cutting equipment manufacturing, including a workbench, the top of which is slidably connected to an electric slider, the top of which is fixedly connected to a laser cutting machine, the outer wall of which is fixedly connected to a laser cutting head, a conveying roller is arranged on the top of the workbench, and a cutting cleaning mechanism is arranged on the outer wall of the electric slider, which relates to the technical field of laser cutting machines. By arranging the cutting cleaning mechanism, the outer wall of the roller is cleaned, and the residues and stains are fully accumulated between the sliding connection plate and the scraper, and the water pipe is connected to the atomizing nozzle, and the atomizing spray in the atomizing nozzle is sprayed; After laser cutting of the scraper, it cannot be removed directly manually because the temperature of laser cutting is too high, and small connections such as burrs will remain between the plate and the scraper, so it is difficult to remove the cut scraper, resulting in low processing efficiency of the scraper. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a laser cutting machine for conveyor scraper processing to solve the problems raised in the above background technology.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: A laser cutting machine for conveyor scraper processing, comprising a workbench, the top of the workbench is movably connected to a first moving device, the top of the first moving device is movably connected to a second moving device, the outer wall of the second moving device is movably connected to a laser cutting device, and the outer wall of the second moving device is fixedly connected to an air cannon mechanism; The air cannon mechanism comprises: A gas chamber, the gas chamber being fixedly connected to the top of the second moving device; a first telescopic machine, wherein the first telescopic machine is fixedly connected to an outer wall of the second moving device; The limiting bin is fixedly connected to the outer wall of the gas bin, the outer wall of the limiting bin is fixedly connected to one end of the connecting bin, the other end of the connecting bin is fixedly connected to the triangular bin, and the triangular bin is also fixedly connected to the outer wall of the second moving device.

[0005] Preferably, an outer wall of the first telescopic machine is movably connected with an extrusion plate, the extrusion plate is plugged into the gas bin, and an outer wall of the extrusion plate is provided with air flow holes.

[0006] Preferably, the inner wall of the airflow hole is rotatably connected with a first shielding plate, and the inner wall of the airflow hole is also fixedly connected with a limiting block, and the first shielding plate is in movably contact with the limiting block.

[0007] Preferably, a circular ring plate is fixedly connected between the gas bin and the limit bin, a third spring is fixedly connected to the inner wall of the limit bin, a second baffle plate is fixedly connected to the outer wall of the third spring, and the second baffle plate is in movably contact with the circular ring plate.

[0008] Preferably, a guide mechanism is fixedly connected to the inner wall of the triangular bin, and the guide mechanism comprises a first slide rail, and the first slide rail is fixedly connected to the inner top of the triangular bin.

[0009] Preferably, a first electric slider is slidably connected to an outer wall of the first slide rail, and a second telescopic machine is fixedly connected to the bottom of the first electric slider.

[0010] Preferably, the bottom of the second telescopic machine is movably connected to a lower pressure plate, the bottom of the lower pressure plate is fixedly connected to a first spring, and the bottom of the first spring is fixedly connected to a gas pipe.

[0011] Preferably, the outer wall of the gas pipe is fixedly connected to a rubber block, the inner wall of the triangular bin is fixedly connected to a rubber ring at a position on the top of the rubber block, the rubber ring is in active contact with the rubber block, a sealing cloth is fixedly connected between the bottom of the triangular bin and the gas pipe, and a T-shaped hole is opened on the outer wall of the gas pipe at the bottom position of the rubber block.

[0012] Preferably, a toggle mechanism is fixedly connected to the top of the workbench, and the toggle mechanism includes a second slide rail, and the second slide rail is fixedly connected to the top of the workbench. A toothed plate is also fixedly connected to the top of the workbench.

[0013] Preferably, the outer wall of the second slide rail is slidably connected to the second electric slider, the top of the second electric slider is fixedly connected to a connecting rod, the outer wall of the connecting rod is fixedly connected to a paddle plate, the paddle plate is movably contacted with the tooth plate, the outer wall of the connecting rod is fixedly connected to a second spring, and the outer wall of the second spring is fixedly connected to a clip.

[0014] The present invention provides a laser cutting machine for conveyor scraper processing, which has the following beneficial effects: 1. The laser cutting machine for conveyor scraper processing squeezes the gas in the gas bin when the extrusion plate moves toward the gas bin, so that the gas enters the triangular bin through the limit bin and the connecting bin, and then accelerates the falling of the scraper under the impact of the airflow, thereby avoiding the low processing efficiency caused by the difficulty in separating the scraper. When the extrusion plate squeezes the gas toward the gas bin again, the gas in the gas bin will also be squeezed onto the first shielding plate, so that the first shielding plate is again attached to the airflow hole, preventing the airflow from being discharged, thereby achieving the effect of guiding the airflow.

[0015] 2. The laser cutting machine used for conveyor scraper processing, when the extrusion plate squeezes the gas in the gas bin, when the extrusion plate stops squeezing the gas in the gas bin, the elastic extrusion of the third spring makes the second baffle plate fit again on the annular plate to prevent the airflow from being discharged, and the first baffle plate cooperates with the second baffle plate to guide the airflow and ensure that the gas is compressed.

[0016] 3. The laser cutting machine used for conveyor scraper processing, after a certain period of compression, the airflow will be blown out from the T-shaped hole, the triangular bin is located on the scraper position to be cut, the airflow impacts the scraper when blowing out, causing the scraper to fall, and the impact of the air cannon is used to accelerate the falling of the scraper, avoiding the impact on the processing efficiency. The first electric slider is located on the first slide rail and moves from one end to the other. During the movement, the T-shaped hole intermittently blows out the air cannon to impact the cut scraper. The connection between the scraper and the plate is a plurality of residual connections, and the direct impact on the middle position of the scraper will cause the plurality of residual connection positions to be stressed. The scraper is impacted from different positions by changing the angle, which accelerates the falling of the scraper and ensures the processing efficiency of the scraper.

[0017] 4. The laser cutting machine used for conveyor scraper processing drives the connecting rod to move during the back-and-forth movement of the second electric slider, and the toggle plate is located on the tooth plate and moves, which drives the second spring to vibrate during the movement, thereby driving the plate to vibrate, causing the scraper on the plate to fall off, accelerating the falling of the scraper and improving the processing efficiency of the scraper. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the axial side stereoscopic structure of the present invention; Figure 2 It is a schematic diagram of the local structure of the gas warehouse of the present invention; Figure 3 For the present invention Figure 2 Schematic diagram of the cross-section structure; Figure 4 For the present invention Figure 3 A schematic diagram of the enlarged structure of the middle part A; Figure 5 This is a schematic diagram of the local structure of the triangular warehouse of the present invention; Figure 6 For the present invention Figure 5 Schematic diagram of the cross-section structure; Figure 7 It is a schematic diagram of the local structure of the gas pipe of the present invention; Figure 8 It is a schematic diagram of the back three-dimensional structure of the present invention; Fig. 9 For the present invention Figure 8 Schematic diagram of the enlarged structure of part B in the middle.

[0019] In the figure: 1. workbench; 2. first moving device; 3. second moving device; 4. laser cutting device; 5. air cannon mechanism; 51. gas chamber; 52. first telescopic machine; 53. limit chamber; 54. connecting chamber; 55. triangular chamber; 56. extrusion plate; 57. air flow hole; 58. first baffle plate; 59. circular ring plate; 510. second baffle plate; 511. third spring; 512. limit block; 6. guiding mechanism; 61. first slide rail; 62. first electric slider; 63. second telescopic machine; 64. lower pressure plate; 65. first spring; 66. gas pipe; 67. rubber ring; 68. rubber block; 69. sealing cloth; 610. T-shaped hole; 7. toggle mechanism; 71. tooth plate; 72. second electric slider; 73. second slide rail; 74. connecting rod; 75. toggle piece; 76. second spring; 77. clamp. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0022] For example, see Figure 1-7 The present invention provides a technical solution: a laser cutting machine for conveyor scraper processing, comprising a workbench 1, a first moving device 2 is movably connected to the top of the workbench 1, a second moving device 3 is movably connected to the top of the first moving device 2, a laser cutting device 4 is movably connected to the outer wall of the second moving device 3, and an air cannon mechanism 5 is fixedly connected to the outer wall of the second moving device 3; The air cannon mechanism 5 comprises: A gas chamber 51, the gas chamber 51 is fixedly connected to the top of the second moving device 3; A first telescopic machine 52, the first telescopic machine 52 is fixedly connected to the outer wall of the second moving device 3; The limiting bin 53 is fixedly connected to the outer wall of the gas bin 51 , the outer wall of the limiting bin 53 is fixedly connected to one end of the connecting bin 54 , the other end of the connecting bin 54 is fixedly connected to the triangular bin 55 , and the triangular bin 55 is also fixedly connected to the outer wall of the second moving device 3 .

[0023] An extrusion plate 56 is movably connected to the outer wall of the first telescopic machine 52 . The extrusion plate 56 is plugged into the gas chamber 51 . An air flow hole 57 is formed on the outer wall of the extrusion plate 56 .

[0024] The inner wall of the airflow hole 57 is rotatably connected with the first shielding plate 58 . The inner wall of the airflow hole 57 is also fixedly connected with the limiting block 512 . The first shielding plate 58 is in movably contact with the limiting block 512 .

[0025] A circular plate 59 is fixedly connected between the gas chamber 51 and the limiting chamber 53 . A third spring 511 is fixedly connected to the inner wall of the limiting chamber 53 . A second baffle plate 510 is fixedly connected to the outer wall of the third spring 511 . The second baffle plate 510 is in active contact with the circular plate 59 .

[0026] The inner wall of the triangular bin 55 is fixedly connected with a guide mechanism 6 . The guide mechanism 6 includes a first slide rail 61 . The first slide rail 61 is fixedly connected to the inner top of the triangular bin 55 .

[0027] The outer wall of the first slide rail 61 is slidably connected with a first electric slider 62 , and the bottom of the first electric slider 62 is fixedly connected with a second telescopic machine 63 .

[0028] The bottom of the second telescopic machine 63 is movably connected to a lower pressing plate 64 , the bottom of the lower pressing plate 64 is fixedly connected to a first spring 65 , and the bottom of the first spring 65 is fixedly connected to a gas pipe 66 .

[0029] A rubber block 68 is fixedly connected to the outer wall of the gas pipe 66, a rubber ring 67 is fixedly connected to the inner wall of the triangular bin 55 at the top of the rubber block 68, the rubber ring 67 is in movable contact with the rubber block 68, a sealing cloth 69 is fixedly connected between the bottom of the triangular bin 55 and the gas pipe 66, and a T-shaped hole 610 is opened on the outer wall of the gas pipe 66 at the bottom of the rubber block 68.

[0030] When in use, the raw materials to be processed are placed on the workbench 1, and the first moving device 2 and the second moving device 3 can drive the movement of the position of the laser cutting device 4, and then the laser cutting device 4 cuts the raw materials into plates. After cutting, the first telescopic machine 52 is powered on and started, and the first telescopic machine 52 drives the extrusion plate 56 to move. When the extrusion plate 56 moves toward the gas bin 51, it squeezes the gas in the gas bin 51, so that the gas passes through the limit bin 53 and the connecting bin 54 and enters the triangular bin 55. Then, when the extrusion plate 56 moves toward the outside of the gas bin 51, the movement of the extrusion plate 56 drives the gas The airflow is squeezed to the first shielding plate 58, so that the first shielding plate 58 moves toward the limit block 512. At this time, a gap is generated between the first shielding plate 58 and the airflow hole 57. The gap allows the external gas to enter the gas chamber 51 again. The limit block 512 intercepts the first shielding plate 58 to prevent the first shielding plate 58 from moving too much. When the squeezing plate 56 squeezes the gas toward the gas chamber 51 again, the gas in the gas chamber 51 is also squeezed onto the first shielding plate 58, so that the first shielding plate 58 is again attached to the airflow hole 57 to prevent the airflow from being discharged. Combined with Figure 4 As shown, when the squeezing plate 56 squeezes the gas in the gas bin 51, the airflow passes through the annular plate 59 under the squeezing of the gas, and then the squeezing of the airflow drives the second shielding plate 510 to move, so the airflow can enter the limiting bin 53. When the squeezing plate 56 stops squeezing the gas in the gas bin 51, the elastic length of the third spring 511 is greater than the distance between the inner wall of the limiting bin 53 and the annular plate 59, so the elastic squeezing of the third spring 511 makes the second shielding plate 510 fit on the annular plate 59 again to prevent the airflow from being discharged. Combined with Figure 6 As shown, at this time, the gas is squeezed into the triangular bin 55, and the gas is compressed in the triangular bin 55. The second telescopic machine 63 is powered on and started to drive the lower pressure plate 64 to contract. At this time, the gas tube 66 is pulled by the first spring 65 to contract, and then the gas tube 66 drives the rubber block 68 to fit on the rubber ring 67 to prevent the airflow from blowing out. After a certain period of compression, the second telescopic machine 63 drives the gas tube 66 to extend. At this time, a gap is generated between the rubber block 68 and the rubber ring 67. At this time, the airflow is blown out between the rubber ring 67 and the sealing cloth 69. The sealing cloth 69 is sealed between the bottom of the triangular bin 55 and the gas tube 66, so the airflow will be blown out from the T-shaped hole 610 on the gas tube 66. At this time, the triangular bin 55 is located at the cut scraper position, and the airflow impacts the scraper when blowing out, causing the scraper to fall off. The first electric slider 62 is powered on and started. The first electric slider 62 is located on the first slide rail 61 and moves from one end to the other end. During the movement, the T-shaped hole 610 intermittently blows out air cannons to impact the cut scraper. Moreover, the first electric slider 62 is located at different positions on the first slide rail 61. At this time, the angle of the gas pipe 66 is also skewed. Then, one end of the scraper is impacted first, and then different positions of the scraper are slowly impacted. The scraper is impacted with concentrated force to avoid the dispersion of the impact force of the air cannon.

[0031] For example 2, please refer to Figure 1-9 Based on the first embodiment, the present invention provides a technical solution: The top of the workbench 1 is fixedly connected with a toggle mechanism 7 , which includes a second slide rail 73 . The second slide rail 73 is fixedly connected to the top of the workbench 1 . The top of the workbench 1 is also fixedly connected with a toothed plate 71 .

[0032] The outer wall of the second slide rail 73 is slidably connected to the second electric slider 72, the top of the second electric slider 72 is fixedly connected to the connecting rod 74, the outer wall of the connecting rod 74 is fixedly connected to a paddle plate 75, the paddle plate 75 is in movably contact with the tooth plate 71, the outer wall of the connecting rod 74 is fixedly connected to a second spring 76, and the outer wall of the second spring 76 is fixedly connected to a clip 77.

[0033] When in use, the second spring 76 is stretched so that the clip 77 is clamped on the original plate material, and the second electric slider 72 is powered on and started to move on the second slide rail 73. At this time, the second electric slider 72 drives the connecting rod 74 to move during the back and forth movement, and the paddle plate 75 moves on the tooth plate 71, driving the second spring 76 to vibrate during the movement, thereby driving the plate to vibrate, causing the scraper on the plate to fall off.

[0034] For example 3, please refer to Figure 1-9 , the present invention provides a technical solution: When applied to plates with higher hardness: The raw materials to be processed are placed on the workbench 1. The first moving device 2 and the second moving device 3 can drive the movement of the laser cutting device 4. Then the laser cutting device 4 cuts the raw materials into plates. During the cutting process, the first telescopic machine 52 drives the extrusion plate 56 to move. When the extrusion plate 56 moves toward the gas bin 51, it will squeeze the gas in the gas bin 51, so that the gas enters the triangular bin 55 through the limit bin 53 and the connecting bin 54. Then, when the extrusion plate 56 moves toward the outside of the gas bin 51, the movement of the extrusion plate 56 will drive the extrusion of the gas, so the gas The air flow is squeezed to the first baffle plate 58, so that the first baffle plate 58 moves toward the limit block 512. At this time, a gap is generated between the first baffle plate 58 and the air flow hole 57. The gap allows the external gas to enter the gas chamber 51 again. The limit block 512 intercepts the first baffle plate 58 to prevent the first baffle plate 58 from moving too much. When the squeezing plate 56 squeezes the gas toward the gas chamber 51 again, the gas in the gas chamber 51 is also squeezed onto the first baffle plate 58, so that the first baffle plate 58 is again attached to the air flow hole 57 to prevent the air flow from being discharged. Combined with Figure 4 As shown, when the squeezing plate 56 squeezes the gas in the gas bin 51, the airflow passes through the annular plate 59 under the squeezing of the gas, and then the squeezing of the airflow drives the second shielding plate 510 to move, so the airflow can enter the limiting bin 53. When the squeezing plate 56 stops squeezing the gas in the gas bin 51, the elastic length of the third spring 511 is greater than the distance between the inner wall of the limiting bin 53 and the annular plate 59, so the elastic squeezing of the third spring 511 makes the second shielding plate 510 fit on the annular plate 59 again to prevent the airflow from being discharged. Combined with Figure 6 As shown, at this time, the gas is squeezed into the triangular bin 55, and the gas is compressed in the triangular bin 55. The second telescopic machine 63 is powered on and started to drive the lower pressure plate 64 to contract. At this time, the gas tube 66 is pulled by the first spring 65 to contract, and then the gas tube 66 drives the rubber block 68 to fit on the rubber ring 67 to prevent the airflow from blowing out. After a certain period of compression, the second telescopic machine 63 drives the gas tube 66 to extend. At this time, a gap is generated between the rubber block 68 and the rubber ring 67. At this time, the airflow is blown out between the rubber ring 67 and the sealing cloth 69. The sealing cloth 69 is sealed between the bottom of the triangular bin 55 and the gas tube 66, so the airflow will come from the T-shaped hole 610 on the gas tube 66, and then blow out from the T-shaped hole 610. At this time, the triangular bin 55 is located at the scraper position to be cut, and the airflow impacts the scraper when blowing out, causing the scraper to fall off. The first electric slider 62 is powered on and started. The first electric slider 62 is located on the first slide rail 61 and moves from one end to the other end. During the movement, the T-shaped hole 610 intermittently blows out air cannons to impact the cut scraper. Moreover, the first electric slider 62 is located at different positions on the first slide rail 61. At this time, the angle of the gas pipe 66 is also skewed. Then, one end of the scraper is impacted first, and then different positions of the scraper are slowly impacted. The scraper is impacted with concentrated force to avoid the dispersion of the impact force of the air cannon.

[0035] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A laser cutting machine for conveyor scraper processing, comprising a workbench (1), the top of the workbench (1) being movably connected to a first moving device (2), the top of the first moving device (2) being movably connected to a second moving device (3), the outer wall of the second moving device (3) being movably connected to a laser cutting device (4), characterized in that: An air cannon mechanism (5) is fixedly connected to the outer wall of the second moving device (3); The air cannon mechanism (5) comprises: A gas bin (51), wherein the gas bin (51) is fixedly connected to the top of the second moving device (3); A first telescopic machine (52), the first telescopic machine (52) being fixedly connected to an outer wall of the second moving device (3); A limiting bin (53), wherein the limiting bin (53) is fixedly connected to the outer wall of the gas bin (51), the outer wall of the limiting bin (53) is fixedly connected to one end of a connecting bin (54), the other end of the connecting bin (54) is fixedly connected to a triangular bin (55), and the triangular bin (55) is also fixedly connected to the outer wall of the second moving device (3).

2. A laser cutting machine for conveyor scraper processing according to claim 1, characterized in that: An extrusion plate (56) is movably connected to the outer wall of the first telescopic machine (52); the extrusion plate (56) is plugged into the gas bin (51); and an air flow hole (57) is provided on the outer wall of the extrusion plate (56).

3. The laser cutting machine for conveyor scraper processing according to claim 2, characterized in that: The inner wall of the airflow hole (57) is rotatably connected to a first baffle plate (58), and the inner wall of the airflow hole (57) is also fixedly connected to a limiting block (512), and the first baffle plate (58) is in active contact with the limiting block (512).

4. The laser cutting machine for conveyor scraper processing according to claim 3, characterized in that: A circular plate (59) is fixedly connected between the gas bin (51) and the limit bin (53); a third spring (511) is fixedly connected to the inner wall of the limit bin (53); a second baffle plate (510) is fixedly connected to the outer wall of the third spring (511); and the second baffle plate (510) is in movable contact with the circular plate (59).

5. The laser cutting machine for conveyor scraper processing according to claim 1, characterized in that: A guide mechanism (6) is fixedly connected to the inner wall of the triangular bin (55), and the guide mechanism (6) comprises a first slide rail (61). The first slide rail (61) is fixedly connected to the inner top of the triangular bin (55).

6. The laser cutting machine for conveyor scraper processing according to claim 5, characterized in that: The outer wall of the first slide rail (61) is slidably connected to a first electric slide block (62), and the bottom of the first electric slide block (62) is fixedly connected to a second telescopic machine (63).

7. The laser cutting machine for conveyor scraper processing according to claim 6, characterized in that: The bottom of the second telescopic machine (63) is movably connected to a lower pressure plate (64), the bottom of the lower pressure plate (64) is fixedly connected to a first spring (65), and the bottom of the first spring (65) is fixedly connected to a gas pipe (66).

8. The laser cutting machine for conveyor scraper processing according to claim 7, characterized in that: The outer wall of the gas pipe (66) is fixedly connected to a rubber block (68); the inner wall of the triangular bin (55) is fixedly connected to a rubber ring (67) at a position located at the top of the rubber block (68); the rubber ring (67) is in movable contact with the rubber block (68); a sealing cloth (69) is fixedly connected between the bottom of the triangular bin (55) and the gas pipe (66); and the outer wall of the gas pipe (66) is provided with a T-shaped hole (610) at a position located at the bottom of the rubber block (68).

9. The laser cutting machine for conveyor scraper processing according to claim 1, characterized in that: The top of the workbench (1) is fixedly connected to a toggle mechanism (7), the toggle mechanism (7) comprises a second slide rail (73), the second slide rail (73) is fixedly connected to the top of the workbench (1), and the top of the workbench (1) is also fixedly connected to a toothed plate (71).

10. The laser cutting machine for conveyor scraper processing according to claim 9, characterized in that: The outer wall of the second slide rail (73) is slidably connected to a second electric slider (72); the top of the second electric slider (72) is fixedly connected to a connecting rod (74); the outer wall of the connecting rod (74) is fixedly connected to a shifting piece (75); the shifting piece (75) is in movably contact with the tooth plate (71); the outer wall of the connecting rod (74) is fixedly connected to a second spring (76); and the outer wall of the second spring (76) is fixedly connected to a clip (77).

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