Laser cutting equipment for building construction and cutting method

Abstract

The invention discloses laser cutting equipment for building construction and a cutting method, and particularly relates to the technical field of laser cutting, the laser cutting equipment for building construction comprises a base, a surrounding cutting assembly is arranged on the base, and the surrounding cutting assembly comprises a limiting cylinder arranged at the top of the base and used for protection. A laser beam emitted by a laser cutter irradiates the surface of a workpiece, the workpiece reaches a melting point and is broken, the workpiece is located in the middle of the laser cutter, the laser beam is prevented from being diffused, the laser beam is prone to being gathered at a certain position, and a limiting sleeve drives a connecting ring, the laser cutter and a second gear to be close to a beam rod barrel. And the workpiece is continuously conveyed to be clamped and positioned through the clamping plate and the limiting groove, and continuous work of the device is facilitated.

Description

Technical Field

[0001] The present invention relates to the field of laser cutting technology, and more specifically, to a laser cutting device and a cutting method for building construction. Background Art

[0002] The working principle of the laser cutting machine is to focus the laser emitted from the laser into a high-power density laser beam through the optical path system. This laser beam irradiates the surface of the workpiece, causing the workpiece to reach the melting point or boiling point, and at the same time, the high-pressure gas coaxial with the beam blows away the molten or vaporized metal. As the relative position of the beam and the workpiece moves, the material is eventually cut, thereby achieving the purpose of cutting. The construction project is part of the construction project, which refers to the engineering entity formed by the construction of various types of buildings and their ancillary facilities and the installation of supporting lines, pipelines, and equipment. In construction, some steel materials need to be cut.

[0003] Among them, the patent with announcement number CN220993146U discloses a construction cutting equipment, which relates to the field of construction technology, including a track and a fixed plate. Two pairs of rollers are provided on the lower surface of the fixed plate, and the rollers are fixedly connected to the upper surface of the track. A tooth plate is fixedly provided on the upper surface of the track. A laser cutting device is provided on the upper surface of the fixed plate. A connecting pipe is fixedly provided on the laser cutting device, and a cutting head is fixedly provided at one end of the connecting pipe. A fixed column is fixedly provided on one side of the fixed plate, and a movable column is slidingly provided in the fixed column. A fixed frame is fixedly provided at one end of the movable column, and a pair of fixed shafts are fixedly provided on the fixed frame, and clamping blocks are rotatably provided on the fixed shafts.

[0004] When the structure is in use, a track and a fixed plate on the track, and a laser cutting device fixed on the fixed plate are set up. The laser cutting device is driven to move by the fixed plate, so that the cutting head cuts the steel laid on one side. Not only is the structure light and easy to carry, but the cutting is also faster. However, the structure is not easy to perform rotational cutting on the workpiece when in use, and can only cut one side of the workpiece, resulting in low cutting efficiency. In addition, the device itself occupies a large area, which is not convenient to use in construction. Summary of the invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a laser cutting device and a cutting method for construction, aiming to solve the problems raised in the above-mentioned background technology.

[0006] The present invention provides the following technical solutions: a laser cutting device for construction, comprising a base, on which a surrounding cutting assembly is arranged; the surrounding cutting assembly comprises a limiting cylinder arranged on the top of the base for protection, the middle part of the limiting cylinder is rotatably connected with a tie rod cylinder for positioning a workpiece, and one end of the tie rod cylinder is provided with a limiting sleeve for installing a laser cutter, the laser cutter is embedded in the limiting sleeve and is clamped with the limiting sleeve; one side of the limiting sleeve is rotatably connected with a connecting ring for support, and one side of the connecting ring is fixedly provided with a second gear Wheel; a support frame for supporting is provided on the upper surface of the base, an electric push rod for driving is provided on the support frame, a second cross bar is provided at the output end of the electric push rod, the second cross bar is horizontally placed on the top of the support frame, and both ends of the second cross bar are rotatably connected with a pull rod for traction, and one end of the support frame away from the second cross bar is rotatably connected with a first cross bar for supporting, the first cross bar is inserted into the electric push rod and rotatably connected with the electric push rod, the bottom of the pull rod extends to the side of the support frame, and the support frame and the pull rod are rotatably connected through a pin shaft.

[0007] It can be seen that in the above technical solution, the electric push rod drives the second cross bar to move, and when the second cross bar moves, it drives the pull rod to rotate along the axis point of the connection between the pull rod and the support frame, thereby causing the slider to move. When the slider moves, it slides and fine-tunes in the slide groove, thereby causing the limit sleeve to drive the connecting ring, the laser cutter and the second gear to approach the beam tube, and the second gear can fit with the positioning cone slope on the beam tube, which makes it easy for the second gear and the beam tube to be stuck together, and facilitates the rotation of the second gear to drive the beam tube to rotate, thereby allowing the workpiece to rotate, making it easy to cut different surfaces of the workpiece and improving the cutting efficiency. At the same time, when cutting, the laser beam emitted by the laser cutter irradiates the surface of the workpiece, causing the workpiece to reach the melting point and break.

[0008] Optionally, in a possible embodiment, the bottom end of the support frame is rotatably connected to a sliding block through an axle pin, and sliding grooves are provided on both sides of the surface of the limit sleeve, and the sliding block extends into the sliding groove and is slidably connected to the sliding groove, and a first gear is provided on the outer side of the second gear, and the first gear is meshed with the second gear, and a rotating shaft is fixedly provided on the first gear, and a driving motor for driving the rotating shaft to rotate is provided at one end of the rotating shaft, and the driving motor is installed on the outer side of the limit cylinder through bolts, and a positioning cone slope is provided at the end of the beam cylinder facing the second gear, and the internal vertical cross-section shapes of the positioning cone slope and the second gear are both conical, and the end of the limit cylinder away from the limit sleeve is installed with a docking plate by bolts, and two guide rails are installed on the docking plate by bolts, and two clamps are slidably connected between the two guide rails, and one end of each clamp is provided with a limiting groove for positioning the workpiece.

[0009] It can be seen that in the above technical solution, the driving motor starts the driving shaft to rotate, and then the first gear rotates, which makes it easy for the first gear to drive the second gear to rotate, and convenient for the second gear to drive the bundle rod tube to rotate, so that the workpiece can be rotated, which makes it easy to cut different surfaces of the workpiece and improve the cutting efficiency. After the workpiece is cut, the cut workpiece is removed, and the workpiece is clamped and positioned by continuously conveying the workpiece through the clamping plate and the limit groove, which makes it easy for the device to work continuously.

[0010] The present invention also provides a cutting method using the above-mentioned laser cutting equipment for construction, comprising the following steps:

[0011] Step 1: Pass one end of the workpiece through the limiting sleeve, the laser cutter and the limiting cylinder in sequence and extend it to between the two limiting grooves, and position the workpiece through the clamping plate.

[0012] Step 2: While cutting, the electric push rod drives the second cross bar to move. When the second cross bar moves, it drives the pull rod to rotate along the axis point of the connection between the pull rod and the support frame, thereby causing the slider to move. When the slider moves, it slides and fine-tunes in the slide groove.

[0013] Step three, the connecting ring, laser cutter and second gear are driven to approach the tie rod tube through the limiting sleeve, and the second gear can fit with the positioning cone slope on the tie rod tube, which makes it easy for the second gear and the tie rod tube to be stuck together, and the rotation of the second gear drives the tie rod tube to rotate, thereby allowing the workpiece to rotate.

[0014] Step 4: The laser beam emitted by the laser cutter irradiates the surface of the workpiece, causing the workpiece to reach the melting point and break, and the second gear rotates to drive the beam rod tube to rotate, thereby allowing the workpiece to rotate.

[0015] Step 5. After the workpiece is cut, the cut workpiece is removed, and the workpiece is clamped and positioned through the clamping plate and the limiting groove by continuously conveying the workpiece, so that the device can work continuously.

[0016] Technical effects and advantages of the present invention:

[0017] 1. The laser beam emitted by the laser cutter of the present invention irradiates the surface of the workpiece, causing the workpiece to reach the melting point and break. The workpiece is located in the middle of the laser cutter to avoid the diffusion of the laser beam and is easy to gather at a certain place. At the same time, the driving motor starts the driving shaft to rotate, and then the first gear rotates, which is easy to drive the second gear to rotate when the first gear rotates, and the beam rod cylinder is driven to rotate when the second gear rotates, so that the workpiece can be rotated, which is easy to cut different surfaces of the workpiece and improve the cutting efficiency;

[0018] 2. In the present invention, one end of the workpiece passes through the limiting sleeve, the laser cutter and the limiting cylinder in sequence and extends to between the two limiting grooves, and the workpiece is positioned by the clamping plate to ensure the stability of the workpiece during cutting. After the workpiece is cut, the cut workpiece is removed, and the workpiece is clamped and positioned by continuously conveying the workpiece through the clamping plate and the limiting groove, so that the device can work continuously;

[0019] 3. The pull rod of the present invention rotates along the axis point of the connection between the pull rod and the support frame, thereby causing the slider to move. When the slider moves, it slides and fine-tunes in the slide groove, thereby causing the limit sleeve to drive the connecting ring, the laser cutter and the second gear to approach the tie rod cylinder, making it easy for the second gear and the tie rod cylinder to be stuck together. Each structure cooperates to drive the workpiece to rotate to achieve the function of cutting the workpiece surface;

[0020] To sum up, through the corresponding coordinated use of various structures, the laser beam emitted by the laser cutter irradiates the surface of the workpiece, causing the workpiece to reach the melting point and break, and the workpiece is located in the middle of the laser cutter to avoid the diffusion of the laser beam and is easy to gather at a certain place. The limit sleeve drives the connecting ring, the laser cutter and the second gear to approach the beam tube, which makes it easy for the second gear and the beam tube to be stuck together. The various structures are linked and coordinated to drive the workpiece to rotate to achieve the function of cutting the workpiece surface, thereby improving the cutting efficiency. The splint positions the workpiece to ensure the stability of the workpiece during cutting. After the workpiece cutting is completed, the cut workpiece is removed, and the workpiece is clamped and positioned through the splint and the limit groove by continuously conveying the workpiece, which makes it easy for the device to work continuously. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the present disclosure, the following briefly introduces the drawings required for use in some embodiments. Obviously, the drawings described below are only drawings of some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams, and are not intended to limit the actual size of the product involved in the embodiments of the present disclosure, the actual process of the method, the actual timing of the signal, etc.

[0022] Figure 1 It is the front view of the overall structure of the present invention.

[0023] Figure 2 It is a side view of the overall structure of the present invention.

[0024] Figure 3 For the present invention Figure 2 Schematic diagram on the right.

[0025] Figure 4 It is a stereoscopic diagram of the limiting cylinder, the driving motor, the rotating shaft and the first gear of the present invention.

[0026] Figure 5It is a three-dimensional diagram of the docking plate, guide rail and clamping plate of the present invention.

[0027] Figure 6 It is a stereoscopic view of the tie rod cylinder, the second gear, the connecting ring, the second cross rod and the pull rod of the present invention.

[0028] Figure 7 It is a stereoscopic diagram of the tie rod cylinder, the first gear, the second gear and the slider of the present invention.

[0029] Figure 8 It is a stereoscopic diagram of the pull rod, the second cross rod, the support frame and the electric push rod of the present invention.

[0030] In the figure: 1. base; 2. limiting cylinder; 3. tie rod cylinder; 4. limiting sleeve; 5. connecting ring; 6. laser cutter; 7. support frame; 8. first cross bar; 9. electric push rod; 10. second cross bar; 11. pull rod; 12. pin shaft; 13. driving motor; 14. rotating shaft; 15. first gear; 16. second gear; 17. docking plate; 18. guide rail; 19. clamping plate; 20. limiting groove; 21. slide groove; 22. slider; 23. positioning cone slope. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on 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.

[0032] As attached Figure 1-Figure 8 The laser cutting equipment for construction shown in the figure, through the surrounding cutting assembly arranged on the base 1, the laser beam emitted by the laser cutter 6 irradiates the surface of the workpiece, so that the workpiece reaches the melting point and breaks it, and the workpiece is located in the middle of the laser cutter 6, avoiding the diffusion of the laser beam, and is easy to gather at a certain place, the limiting sleeve 4 drives the connecting ring 5, the laser cutter 6 and the second gear 16 to approach the beam tube 3, and it is easy for the second gear 16 and the beam tube 3 to be stuck together, and each structure is linked to drive the workpiece to rotate to achieve the function of cutting the workpiece surface, thereby improving the cutting efficiency, the clamping plate 19 positions the workpiece to ensure the stability of the workpiece during cutting, and after the workpiece cutting is completed, the cut workpiece is removed, and the workpiece is clamped and positioned by continuously conveying the workpiece through the clamping plate 19 and the limiting groove 20, so that the device is easy to work continuously, and the specific structural arrangement of the assembly is as follows;

[0033] The surrounding cutting assembly includes a limiting cylinder 2 arranged on the top of the base 1 for protection, the middle part of the limiting cylinder 2 is rotatably connected with a restraining rod cylinder 3 for positioning the workpiece, and one end of the restraining rod cylinder 3 is provided with a limiting sleeve 4 for installing a laser cutter 6, and the laser cutter 6 is embedded in the limiting sleeve 4 and clamped with the limiting sleeve 4.

[0034] One side of the limiting sleeve 4 is rotatably connected to a connecting ring 5 for support, and one side of the connecting ring 5 is fixedly provided with a second gear 16 .

[0035] A support frame 7 for support is provided on the upper surface of the base 1, and an electric push rod 9 for driving is provided on the support frame 7. A second cross bar 10 is provided at the output end of the electric push rod 9. The second cross bar 10 is horizontally placed on the top of the support frame 7, and both ends of the second cross bar 10 are rotatably connected with a pull rod 11 for traction. One end of the support frame 7 away from the second cross bar 10 is rotatably connected with a first cross bar 8 for support. The first cross bar 8 is inserted into the electric push rod 9 and is rotatably connected with the electric push rod 9. The bottom of the pull rod 11 extends to the side of the support frame 7, and the support frame 7 and the pull rod 11 are rotatably connected through a pin shaft 12.

[0036] The bottom end of the support frame 7 is rotatably connected with a slider 22 through an axle pin, and slide grooves 21 are provided on both sides of the surface of the limit sleeve 4. The slider 22 extends into the slide groove 21 and is slidably connected with the slide groove 21. A first gear 15 is provided on the outer side of the second gear 16, and the first gear 15 is meshed with the second gear 16. A rotating shaft 14 is fixedly provided on the first gear 15, and a driving motor 13 for driving the rotating shaft 14 to rotate is provided at one end of the rotating shaft 14. The driving motor 13 is installed on the outer side of the limit cylinder 2 through bolts, and a positioning cone slope 23 is provided at one end of the tie rod cylinder 3 facing the second gear 16. The internal vertical cross-section shape of the positioning cone slope 23 and the second gear 16 is both conical, and a docking plate 17 is installed at one end of the limit cylinder 2 away from the limit sleeve 4 through bolts, and two guide rails 18 are installed on the docking plate 17 through bolts. Two clamps 19 are slidably connected between the two guide rails 18, and one end of each clamp 19 is provided with a limiting groove 20 for positioning the workpiece.

[0037] The present invention also provides a cutting method using the above-mentioned laser cutting equipment for construction, comprising the following steps:

[0038] Step 1: Pass one end of the workpiece through the limiting sleeve 4, the laser cutter 6 and the limiting cylinder 2 in sequence and extend to between the two limiting grooves 20, and position the workpiece through the clamping plate 19.

[0039] Step 2, while cutting, the electric push rod 9 drives the second cross bar 10 to move. When the second cross bar 10 moves, it drives the pull rod 11 to rotate along the axis point of the connection between the pull rod 11 and the support frame 7, and then the slider 22 moves. When the slider 22 moves, it slides and fine-tunes in the slide groove 21.

[0040] Step three, the connecting ring 5, the laser cutter 6 and the second gear 16 are driven to approach the rod tube 3 through the limiting sleeve 4, and the second gear 16 can fit with the positioning cone slope 23 on the rod tube 3, which makes it easy for the second gear 16 and the rod tube 3 to be stuck together, so that the second gear 16 can drive the rod tube 3 to rotate when it rotates, and then the workpiece can be rotated.

[0041] Step 4: The laser beam emitted by the laser cutter 6 irradiates the surface of the workpiece, causing the workpiece to reach the melting point and break, and the second gear 16 rotates to drive the beam tube 3 to rotate, thereby causing the workpiece to rotate.

[0042] Step 5, after the workpiece is cut, the cut workpiece is removed, and the workpiece is clamped and positioned through the clamping plate 19 and the limiting groove 20 by continuously conveying the workpiece, so that the device can work continuously.

[0043] According to the above structure, when in use, the staff installs the device at the designated position. When cutting the workpiece, one end of the workpiece is sequentially passed through the limit sleeve 4, the laser cutter 6 and the limit cylinder 2 and extended to between the two limit grooves 20. The workpiece is positioned by the clamping plate 19 to ensure the stability of the workpiece during cutting. At the same time, when cutting, the second cross bar 10 is driven to move by the electric push rod 9. When the second cross bar 10 is moved, it drives the pull rod 11 to rotate along the axis point of the connection between the pull rod 11 and the support frame 7, thereby causing the slider 22 to move. When the slider 22 is moved, it slides and fine-tunes in the slide groove 21, thereby causing the limit sleeve 4 to drive the connecting ring 5, the laser cutter 6 and the second gear 16 to approach the beam tube 3, and the second gear 16 can fit with the positioning cone slope 23 on the beam tube 3, which is easy for the second gear 16 to move. The wheel 16 and the beam tube 3 are stuck together, so that when the second gear 16 rotates, the beam tube 3 is driven to rotate, and then the workpiece is rotated, which is easy to cut different surfaces of the workpiece, thereby improving the cutting efficiency. At the same time, when cutting, the laser beam emitted by the laser cutter 6 irradiates the surface of the workpiece, so that the workpiece reaches the melting point and breaks. At the same time, the driving motor 13 starts the driving shaft 14 to rotate, thereby rotating the first gear 15, which is easy to drive the second gear 16 to rotate when the first gear 15 rotates, and it is convenient for the second gear 16 to rotate when the second gear 16 rotates, thereby driving the beam tube 3 to rotate, thereby rotating the workpiece, which is easy to cut different surfaces of the workpiece, thereby improving the cutting efficiency. After the workpiece is cut, the cut workpiece is removed, and the workpiece is clamped and positioned by continuously conveying the workpiece through the clamping plate 19 and the limiting groove 20, which facilitates the continuous operation of the device.

[0044] Different from the prior art, the present application discloses a laser cutting device and a cutting method for construction. The laser beam emitted by the laser cutter 6 is irradiated onto the surface of the workpiece, so that the workpiece reaches the melting point and breaks. The workpiece is located in the middle of the laser cutter 6 to avoid the diffusion of the laser beam and is easy to gather at a certain place. The limiting sleeve 4 drives the connecting ring 5, the laser cutter 6 and the second gear 16 to approach the beam tube 3, so that the second gear 16 and the beam tube 3 are easy to be stuck together. The various structures are linked to drive the workpiece to rotate to achieve the function of cutting the workpiece surface, thereby improving the cutting efficiency. The clamping plate 19 positions the workpiece to ensure the stability of the workpiece during cutting. After the workpiece cutting is completed, the cut workpiece is removed, and the workpiece is clamped and positioned through the clamping plate 19 and the limiting groove 20 by continuously conveying the workpiece, so that the device can work continuously.

[0045] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A laser cutting device for construction, comprising a base (1), characterized in that: The base (1) is provided with a surrounding cutting assembly; the surrounding cutting assembly comprises a limiting cylinder (2) provided on the top of the base (1) for protection; the middle part of the limiting cylinder (2) is rotatably connected to a tie rod cylinder (3) for positioning the workpiece; one end of the tie rod cylinder (3) is provided with a limiting sleeve (4) for mounting a laser cutter (6); the laser cutter (6) is embedded in the limiting sleeve (4) and is clamped with the limiting sleeve (4); one side of the limiting sleeve (4) is rotatably connected to a tie rod cylinder (3) for positioning the workpiece; A connecting ring (5) for support, a second gear (16) is fixedly arranged on one side of the connecting ring (5); a supporting frame (7) for support is arranged on the upper surface of the base (1), an electric push rod (9) for driving is arranged on the supporting frame (7), a second cross bar (10) is arranged at the output end of the electric push rod (9), the second cross bar (10) is horizontally placed on the top of the supporting frame (7), and both ends of the second cross bar (10) are rotatably connected to pull rods (11) for traction.

2. The laser cutting equipment for construction according to claim 1, characterized in that: One end of the support frame (7) away from the second cross bar (10) is rotatably connected to a first cross bar (8) for support, and the first cross bar (8) is plugged into the electric push rod (9) and rotatably connected to the electric push rod (9).

3. The laser cutting equipment for construction according to claim 1, characterized in that: The bottom of the pull rod (11) extends to the side of the support frame (7), and the support frame (7) and the pull rod (11) are rotatably connected via a pin shaft (12).

4. The laser cutting equipment for construction according to claim 1, characterized in that: The bottom end of the support frame (7) is rotatably connected to a slider (22) via an axle pin, and sliding grooves (21) are provided on both sides of the surface of the limiting sleeve (4), and the slider (22) extends into the sliding groove (21) and is slidably connected to the sliding groove (21).

5. The laser cutting equipment for construction according to claim 1, characterized in that: A first gear (15) is arranged outside the second gear (16), the first gear (15) is meshed with the second gear (16), and a rotating shaft (14) is fixedly arranged on the first gear (15).

6. The laser cutting equipment for construction according to claim 5, characterized in that: A driving motor (13) for driving the rotating shaft (14) to rotate is disposed at one end of the rotating shaft (14), and the driving motor (13) is mounted on the outside of the limiting cylinder (2) by means of bolts.

7. The laser cutting equipment for construction according to claim 1, characterized in that: A positioning cone slope (23) is provided at one end of the tie rod tube (3) facing the second gear (16); the positioning cone slope (23) and the second gear (16) both have a conical internal vertical cross-section.

8. The laser cutting equipment for construction according to claim 1, characterized in that: A docking plate (17) is installed on one end of the limiting cylinder (2) away from the limiting sleeve (4) via bolts, and two guide rails (18) are installed on the docking plate (17) via bolts.

9. The laser cutting equipment for construction according to claim 8, characterized in that: Two clamping plates (19) are slidably connected between the two guide rails (18), and one end of each clamping plate (19) is provided with a limiting groove (20) for positioning the workpiece.

10. A cutting method using the laser cutting equipment for construction according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: One end of the workpiece is passed through the limiting sleeve (4), the laser cutter (6) and the limiting cylinder (2) in sequence and extended to between the two limiting grooves (20), and the workpiece is positioned by the clamping plate (19); Step 2: while cutting is being performed, the electric push rod (9) drives the second cross bar (10) to move, and when the second cross bar (10) moves, it drives the pull rod (11) to rotate along the axis point where the pull rod (11) and the support frame (7) are connected, thereby causing the slider (22) to move, and when the slider (22) moves, it slides and fine-tunes in the slide groove (21); Step three, the connecting ring (5), the laser cutter (6) and the second gear (16) are driven to approach the tie rod cylinder (3) through the limiting sleeve (4), and the second gear (16) can fit with the positioning cone slope (23) on the tie rod cylinder (3), so that the second gear (16) and the tie rod cylinder (3) are easily stuck together, and the rotation of the second gear (16) drives the tie rod cylinder (3) to rotate, thereby allowing the workpiece to rotate; Step 4: The laser beam emitted by the laser cutter (6) irradiates the surface of the workpiece, causing the workpiece to reach a melting point and break, and the second gear (16) rotates to drive the beam rod cylinder (3) to rotate, thereby causing the workpiece to rotate; Step 5, after the workpiece is cut, the cut workpiece is removed, and the workpiece is clamped and positioned by continuously conveying the workpiece through the clamping plate (19) and the limiting groove (20), so that the device can work continuously.

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