Column beam welding seam cleaning device

Abstract

The invention relates to the field of industrial welding, in particular to a column beam welding seam cleaning device which comprises a base, supporting frames, a transmission structure, an abrasive disc assembly and a driving structure, the supporting frames are slidably installed on the two sides of the base, synchronous adjustment of the distance between the supporting frames is achieved through the transmission structure, and the column beam welding seam cleaning device is adaptive to column beams with different widths; the number of the grinding pieces is fixed through a linkage mechanism of the top block and the rolling wheel, the sliding fixing piece and the positioning sleeve piece, an arc-shaped grinding face matched with a welding seam is formed, and a non-welding area is prevented from being damaged. The driving structure adopts a double-power system, stable rotation of the column beams is achieved through friction transmission of a transmission rod and a transmission ring, uniform grinding is ensured, the fixing assembly elastically clamps the column beams with different diameters through a second spring and an arc-shaped fixing block, and compatibility is improved.

Description

Technical Field

[0001] The present invention relates to the field of industrial welding, and particularly to a cleaning device for column-beam weld seams. Background Art

[0002] In the field of industrial welding, the cleaning of weld seams after column-beam welding is a key process, and its quality directly affects subsequent painting, inspection, and structural stability. After welding, the surface of the column-beam will have welding lines and welding slag, which greatly affects the aesthetics of the cylinder surface. Currently, the main methods for treating the welding area are surface grinding and chemical solution immersion. Chemical agent immersion is suitable for irregular surface welding structures, and the use of chemical agents will cause pollution and require subsequent investment for treatment. The method of surface grinding is very suitable for the treatment of weld seams on the cylinder surface. Currently, grinding of the welding area is mostly carried out by manually holding grinding instruments. Manual operation has a high labor intensity, and the smoothness of processing by holding the instrument is poor, resulting in uneven grinding degree at the weld seam, which affects the aesthetics. For columns and beams with special shapes or large diameter changes, it is time-consuming and laborious to replace the fixture, and even impossible to fix, resulting in low production efficiency. Moreover, rigid clamping is likely to cause damage to the surface of the column-beam or unstable fixation, leading to potential safety hazards.

[0003] Therefore, it is very necessary to propose a cleaning device for column-beam weld seams to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a cleaning device for column-beam weld seams to solve the problems of uneven grinding degree, poor processing smoothness, low work efficiency, and time-consuming and laborious fixture replacement caused by manual operation.

[0005] To achieve the above purpose, the present invention provides the following technical solutions: A cleaning device for column-beam weld seams includes a base. On both sides of the top of the base, two support frames are slidably installed. On one side of the top of the base, a transmission structure for driving the horizontal movement of the support frame is installed. A first motor is fixedly installed on the support frame. The output end of the first motor is connected to a first threaded rod. The first threaded rod is rotatably installed on the support frame. The other end of the first threaded rod is fixedly connected to a smooth long rod. One end of the smooth long rod is rotatably installed on the support frame. A slide rod is fixedly connected between the support frames on the left and right sides of the base. A plurality of first moving blocks are commonly installed on the first threaded rod and the slide rod. The first moving block and the first threaded rod form a screw drive structure, and the first moving block is slidably installed on the slide rod. A grinding disc is fixedly installed on the inner side of the first moving block. The grinding disc is in an arc shape. A roller is rotatably installed on the side of the first moving block away from the grinding disc. A second motor is fixedly installed on the support frame. A second threaded rod is rotatably installed between the support frames on the left and right sides of the base. The second threaded rod is drivingly connected to the second motor. A second moving block is threadedly installed on the second threaded rod. One side of the second moving block close to the first moving block is fixedly installed with a cavity sleeve. The cavity sleeve is slidably connected to the base through a connecting member. A first spring is fixedly connected to the inner bottom of the cavity sleeve. One end of the first spring is fixedly connected to a top block. The top block is slidably installed inside the cavity sleeve. One end of the top block extending out of the cavity sleeve is provided with a smooth inclined surface. The smooth inclined surface of the top block is on the same horizontal line as the roller. An installation frame is fixedly connected to the top of the base. A smooth thin rod is fixedly connected to the extension arm of the installation frame. A sliding fixing member is slidably installed on the smooth thin rod. Screw holes for forming a fixing structure in cooperation with the sliding fixing member are provided at both the upper and lower ends of the first moving block. A positioning kit is fixedly connected to one side of the sliding fixing member. The positioning kit is slidably connected to the smooth thin rod. The other end of the smooth thin rod is fixedly connected to a positioning plate. The positioning plate is fixedly sleeved outside the first threaded rod and the smooth long rod. A first chute for the horizontal movement of the first moving block and the cavity sleeve in cooperation is further provided on the installation frame. A driving structure for rotating the column beam is installed on the base. A fixing component for fixing the column beam is fixedly installed inside the driving structure.

[0006] Preferably, the transmission structure includes a third motor fixedly installed on the base. The output end of the third motor is fixedly connected to a rotating shaft penetrating the support frame. Threads are provided at both ends of the rotating shaft. The support frame and the threads form a thread transmission structure.

[0007] Preferably, the sliding fixing member is C-shaped. A first bolt is threadedly installed on the sliding fixing member.

[0008] Preferably, the positioning kit includes a square block with a rectangular cross-section. The square block is fixedly connected to the sliding fixing member. An empty slot is provided in the square block. A fixing pressing plate is slidably installed in the empty slot. A second bolt is threadedly installed on the square block. The second bolt is rotatably connected to the fixing pressing plate. Second chutes for the sliding of the fixing pressing plate are provided on both the left and right sides of the square block.

[0009] Preferably, the driving structure includes a driving motor and a bearing seat. The driving motor is fixedly installed on a support member connected to the base. A transmission frame is fixedly connected to the output shaft of the driving motor. A bearing frame is fixedly connected to the transmission frame. A transmission ring is fixedly installed on the outside of the bearing frame.

[0010] Preferably, the bearing seat is fixedly installed on the base. A slot is provided at the top of the bearing seat. A curved groove for the driving ring to rotate is provided inside the bearing seat. A cavity is also provided inside the bearing seat. The bottom of the curved groove communicates with the cavity of the bearing seat. The bottom of the driving ring extends into the cavity of the bearing seat. A driving rod is rotatably installed in the cavity of the bearing seat. The driving rod and the driving ring form a driving structure through mutual friction. A motor four drivingly connected to the driving rod is fixedly installed in the cavity of the bearing seat.

[0011] Preferably, the fixing component includes a bearing frame. The cross-section of the bearing frame is rectangular. A second spring is fixedly installed on the inner wall of the bearing frame. A fixing block is fixedly connected to the second spring. The fixing block is an arc-shaped curved block.

[0012] Preferably, there are intervals between multiple first moving blocks.

[0013] The technical effects and advantages of the present invention are as follows: 1. The arc-shaped abrasive discs on multiple first moving blocks can flexibly select the quantity according to the weld size. The motor one drives the first threaded rod to drive the first moving block to move along the sliding rod, pushing the appropriate number of abrasive discs to the positioning plate, and then fixing them through the sliding fixing piece and the positioning kit to form an arc-shaped grinding surface matching the weld. While making the weld grinding more uniform, it can also avoid damaging non-welded parts during grinding.

[0014] 2. The driving structure adopts a dual-power system of the driving motor and the motor four: the driving motor drives the bearing frame to rotate through the transmission frame, and the motor four synchronously drives the column beam to rotate through the friction transmission between the driving rod and the driving ring, ensuring that the column beam obtains stable and uniform rotational power, enabling all parts of the weld to fully contact the abrasive disc, achieving dead-angle-free and uniform grinding, and significantly improving the cleaning quality.

[0015] 3. The linkage mechanism composed of the top block and the first spring can automatically adapt to the movement of the first moving block, avoiding the influence of redundant abrasive discs on the grinding process and facilitating the retraction of the abrasive discs for convenient reuse next time, ensuring the long-term stable operation of the device, while simplifying the structure and reducing costs. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the overall structure of a column beam weld cleaning device of the present invention.

[0017] Figure 2 It is a schematic diagram of the driving structure of the first moving block of the present invention.

[0018] Figure 3 It is a schematic diagram of the cross-sectional structure of the internal structure of the cavity sleeve of the present invention.

[0019] Figure 4 It is a schematic diagram of the mounting frame structure of the present invention.

[0020] Figure 5 This is a schematic diagram of the installation structure of the sliding fixing part and the positioning kit of the present invention.

[0021] Figure 6 This is a schematic diagram of the column-beam drive assembly structure of the present invention.

[0022] Figure 7 This is a schematic diagram of the internal structure of the bearing seat of the present invention.

[0023] Figure 8 This is a schematic diagram of the installation structure of the column-beam of the carrier frame of the present invention.

[0024] In the figure: 1, base; 2, support frame; 3, transmission structure; 301, motor three; 302, rotating shaft; 303, thread; 4, motor one; 5, threaded rod one; 6, smooth long rod; 7, sliding rod; 8, moving block one; 9, grinding disc; 10, motor two; 11, threaded rod two; 12, moving block two; 13, roller; 14, cavity sleeve; 15, spring one; 16, top block; 17, smooth inclined plane; 18, mounting frame; 19, smooth thin rod; 20, sliding fixing part; 2001, bolt one; 21, screw hole; 22, positioning kit; 2201, square block; 2202, empty slot; 2203, fixed pressing plate; 2204, bolt two; 2205, chute two; 23, positioning plate; 24, chute one; 25, drive structure; 26, fixing component; 27, drive motor; 28, transmission frame; 29, carrier frame; 30, transmission ring; 31, bearing seat; 32, curved groove; 33, transmission rod; 34, motor four; 35, spring two; 36, fixed block. Detailed implementation manners

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] The present invention provides as Figures 1 - 8A cleaning device for column-beam weld seams shown in the figure includes a base 1. On both sides of the top of the base 1, two support frames 2 are slidably installed. On one side of the top of the base 1, a transmission structure 3 for driving the horizontal movement of the support frame 2 is installed. A first motor 4 is fixedly installed on the support frame 2. The output end of the first motor 4 is connected to a first threaded rod 5. The first threaded rod 5 is rotatably installed on the support frame 2. The other end of the first threaded rod 5 is fixedly connected to a smooth long rod 6. One end of the smooth long rod 6 is rotatably installed on the support frame 2. A slide rod 7 is fixedly connected between the support frames 2 on the left and right sides of the base 1. A plurality of first moving blocks 8 are jointly installed on the first threaded rod 5 and the slide rod 7. The first moving block 8 and the first threaded rod 5 form a screw drive structure, and the first moving block 8 is slidably installed on the slide rod 7. A grinding disc 9 is fixedly installed on the inner side of the first moving block 8. The grinding disc 9 is in an arc structure. A roller 13 is rotatably installed on the side of the first moving block 8 away from the grinding disc 9; A second motor 10 is fixedly installed on the support frame 2. A second threaded rod 11 is rotatably installed between the support frames 2 on the left and right sides of the base 1. The second threaded rod 11 is drivingly connected to the second motor 10. A second moving block 12 is threadedly installed on the second threaded rod 11. A cavity sleeve 14 is fixedly installed on the side of the second moving block 12 close to the first moving block 8. The cavity sleeve 14 is slidably connected to the base 1 through a connecting piece. A first spring 15 is fixedly connected to the inner bottom of the cavity sleeve 14. One end of the first spring 15 is fixedly connected to a top block 16. The top block 16 is slidably installed inside the cavity sleeve 14. One end of the top block 16 extending out of the cavity sleeve 14 is provided with a smooth inclined surface 17. The smooth inclined surface 17 of the top block 16 is on the same horizontal line as the roller 13; An installation frame 18 is fixedly connected to the top of the base 1. A smooth thin rod 19 is fixedly connected to the extending arm of the installation frame 18. A sliding fixing part 20 is slidably installed on the smooth thin rod 19. Screw holes 21 for forming a fixing structure in cooperation with the sliding fixing part 20 are provided at both the upper and lower ends of the first moving block 8. A positioning kit 22 is fixedly connected to one side of the sliding fixing part 20. The positioning kit 22 is slidably connected to the smooth thin rod 19. The other end of the smooth thin rod 19 is fixedly connected to a positioning plate 23. The positioning plate 23 is fixedly sleeved outside the first threaded rod 5 and the smooth long rod 6. A first chute 24 for cooperating with the horizontal movement of the first moving block 8 and the cavity sleeve 14 is also provided on the installation frame 18; A driving structure 25 for rotating the column-beam is installed on the base 1. A fixing component 26 for fixing the column-beam is fixedly installed inside the driving structure 25; Furthermore, the transmission structure 3 includes a third motor 301 fixedly installed on the base 1. The output end of the third motor 301 is fixedly connected to a rotating shaft 302 passing through the support frame 2. Threads 303 are provided at both ends of the rotating shaft 302. The support frame 2 and the threads 303 form a screw drive structure; Furthermore, the sliding fixing part 20 is in a C shape. A first bolt 2001 is threadedly installed on the sliding fixing part 20; Further, the positioning kit 22 includes a square block 2201 with a rectangular cross-section. The square block 2201 is fixedly connected to the sliding fixing member 20. An empty slot 2202 is provided on the square block 2201. A fixing pressing plate 2203 is slidably installed in the empty slot 2202. A second bolt 2204 is threadedly installed on the square block 2201. The second bolt 2204 is rotatably connected to the fixing pressing plate 2203. Chute two 2205 for cooperating with the sliding of the fixing pressing plate 2203 is provided on both the left and right sides of the square block 2201; Further, the driving structure 25 includes a driving motor 27 and a bearing seat 31. The driving motor 27 is fixedly installed on a support member connected to the base 1. A transmission frame 28 is fixedly connected to the output shaft of the driving motor 27. A bearing frame 29 is fixedly connected to the transmission frame 28. A transmission ring 30 is fixedly installed on the outside of the bearing frame 29; Further, the bearing seat 31 is fixedly installed on the base 1. An opening slot is provided at the top of the bearing seat 31. A curved slot 32 for the transmission ring 30 to rotate is provided inside the bearing seat 31. A cavity is also provided inside the bearing seat 31. The bottom of the curved slot 32 communicates with the cavity of the bearing seat 31. The bottom of the transmission ring 30 extends into the cavity of the bearing seat 31. A transmission rod 33 is rotatably installed in the cavity of the bearing seat 31. The transmission rod 33 and the transmission ring 30 form a transmission structure through mutual friction. A fourth motor 34 drivingly connected to the transmission rod 33 is fixedly installed in the cavity of the bearing seat 31; Further, the fixing assembly 26 includes a bearing frame 29. The cross-section of the bearing frame 29 is rectangular. A second spring 35 is fixedly installed on the inner wall of the bearing frame 29. A fixing block 36 is fixedly connected to the second spring 35. The fixing block 36 is an arc-shaped curved block; Further, there is a gap between multiple first moving blocks (8); In the embodiment of the present invention, in an industrial workshop, the column beam to be cleaned is first fixed on the device to ensure stability during the grinding process. The column beam to be cleaned is placed on the bearing frame 29 of the driving structure 25. The second spring 35 and the arc-shaped fixing block 36 on the inner wall of the bearing frame 29 will automatically fit the surface of the column beam, and adaptive clamping is achieved through the elastic force of the spring to ensure that column beams with different diameters can be stably fixed; Observe the specific position of the welded joint on the column and beam to be cleaned. Adjust the column and beam according to its specific position so that the welded joint is close to the positioning plate 23. First, start the second motor 10. When the second threaded rod 11 drives the second moving block 12 to move to the connection point of the first threaded rod 5 and the smooth long rod 6, continue to move the second moving block 12 closer to the first threaded rod 5. Then, start the first motor 4 to drive the first threaded rod 5 to rotate, driving the first moving block 8 to move horizontally along the slide rod 7. When the roller 13 on the first moving block 8 passes through the smooth inclined surface 17 on the top block 16, the roller 13 presses the top block 16 to retract into the cavity sleeve 14. When the first moving block 8 passes the top block 16 and slides into the smooth long rod 6, the top block 16 returns to its initial state under the elastic action of the first spring 15. Therefore, the staff can select an appropriate number of first moving blocks 8 according to the size and width of the welded joint. After selection, turn off the first motor 4, and use the driving action of the second motor 10 to push the multiple first moving blocks 8 on the smooth long rod 6 to the positioning plate 23 by the top block 16. The staff manually connects the bolt 2001 on the sliding fixing member 20 to the screw hole 21 on the last pushed first moving block 8, and then turns the bolt 2204 on the square block 2201 to make the fixed pressing plate 2203 tightly press on the smooth thin rod 19, thereby realizing the fixation of the multiple first moving blocks 8. Assemble multiple grinding discs 9, so as to realize the adjustment of the size of the grinding disc 9 according to the size of the welded joint, which can not only grind evenly, but also avoid damaging the area outside the welded joint, convenient and fast. After grinding, through the driving action of the second motor 10 and the top block 16, push the first moving blocks 8 to the first threaded rod 5 in sequence and make the first moving blocks 8 return to the initial state through the first motor 4 for the next use; Then, according to the width of the column and beam, start the third motor 301 of the transmission structure 3, and its output shaft drives the rotating shaft 302 to rotate. Since the threads 303 at both ends of the rotating shaft 302 have opposite helix directions, the support frames 2 on both sides of the base 1 will move synchronously inward or outward. After adjusting to the appropriate distance, turn off the third motor 301, so as to realize the grinding disc 9 being abutted against the welded joint; After confirming that the positions of all components are adjusted, start the column and beam driving motor 27 and the fourth motor 34 simultaneously. Through the transmission ring 30 and the curved groove 32, the driving motor 27 drives the carrier 29 to rotate on the carrier seat 31, and the fourth motor 34 drives the transmission rod 33 to rotate. Utilizing the frictional action between the transmission rod 33 and the transmission ring 30, drive the column and beam to rotate, and cooperate with the grinding disc 9 to realize the cleaning of the welded joint.

[0027] The device realizes the adaptive and stable fixation of column beams with different diameters through the elastic clamping of the fixing component 26, accurately matches the weld size and quickly completes the assembly by using the modular grinding disc 9 combination and the convenient motor-driven adjustment structure, makes the column beam rotate evenly by means of the double-power transmission system to ensure the cleaning quality, ensures the smooth displacement of the moving block by relying on the top block linkage mechanism, and at the same time adapts the distance between the support frames through the synchronous transmission adjustment to adapt to different column beam widths, so as to efficiently and accurately complete the cleaning operation, improve the quality and efficiency while reducing the labor cost and operation risk.

[0028] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection required by the present invention is defined by the appended claims and their equivalents.

Claims

1. A cleaning device for column-beam weld seams, comprising a base (1), characterized in that: On both sides of the top of the base (1), two support frames (2) are slidably installed. On one side of the top of the base (1), a transmission structure (3) for driving the horizontal movement of the support frame (2) is installed. A first motor (4) is fixedly installed on the support frame (2). The output end of the first motor (4) is connected to a first threaded rod (5). The first threaded rod (5) is rotatably installed on the support frame (2). The other end of the first threaded rod (5) is fixedly connected to a smooth long rod (6). One end of the smooth long rod (6) is rotatably installed on the support frame (2). A slide rod (7) is fixedly connected between the support frames (2) on the left and right sides of the base (1). A plurality of first moving blocks (8) are jointly installed on the first threaded rod (5) and the slide rod (7). The first moving block (8) and the first threaded rod (5) form a screw drive structure, and the first moving block (8) is slidably installed on the slide rod (7). A grinding disc (9) is fixedly installed on the inner side of the first moving block (8). The grinding disc (9) is in an arc structure. A roller (13) is rotatably installed on the side of the first moving block (8) away from the grinding disc (9); A second motor (10) is fixedly installed on the support frame (2). A second threaded rod (11) is rotatably installed between the support frames (2) on the left and right sides of the base (1). The second threaded rod (11) is drivingly connected to the second motor (10). A second moving block (12) is threadedly installed on the second threaded rod (11). A cavity sleeve (14) is fixedly installed on the side of the second moving block (12) close to the first moving block (8). The cavity sleeve (14) is slidably connected to the base (1) through a connecting member. A first spring (15) is fixedly connected to the inner bottom of the cavity sleeve (14). One end of the first spring (15) is fixedly connected to a top block (16). The top block (16) is slidably installed inside the cavity sleeve (14). A smooth inclined surface (17) is provided at one end of the top block (16) extending out of the cavity sleeve (14). The smooth inclined surface (17) of the top block (16) is on the same horizontal line as the roller (13); An installation frame (18) is fixedly connected to the top of the base (1). A smooth thin rod (19) is fixedly connected to the extension arm of the installation frame (18). A sliding fixing member (20) is slidably installed on the smooth thin rod (19). Screw holes (21) for forming a fixing structure in cooperation with the sliding fixing member (20) are provided at both the upper and lower ends of the first moving block (8). A positioning kit (22) is fixedly connected to one side of the sliding fixing member (20). The positioning kit (22) is slidably connected to the smooth thin rod (19). The other end of the smooth thin rod (19) is fixedly connected to a positioning plate (23). The positioning plate (23) is fixedly sleeved outside the first threaded rod (5) and the smooth long rod (6). A first chute (24) for cooperating with the horizontal movement of the first moving block (8) and the cavity sleeve (14) is also provided on the installation frame (18); A driving structure (25) for rotating the column beam is installed on the base (1). A fixing component (26) for fixing the column beam is fixedly installed inside the driving structure (25).

2. The cleaning device for column-beam weld seams according to claim 1, wherein: The transmission structure (3) includes a third motor (301) fixedly installed on the base (1). The output end of the third motor (301) is fixedly connected to a rotating shaft (302) passing through the support frame (2). Threads (303) are provided at both ends of the rotating shaft (302). A threaded transmission structure is formed between the support frame (2) and the threads (303).

3. The column-beam weld cleaning device according to claim 1, wherein: The sliding fixing member (20) is C-shaped, and a first bolt (2001) is threadedly installed on the sliding fixing member (20).

4. A cleaning device for column-beam weld seams according to claim 1, characterized in that: The positioning kit (22) includes a square block (2201) with a rectangular cross-section. The square block (2201) is fixedly connected to the sliding fixing member (20). An empty slot (2202) is provided on the square block (2201). A fixed pressing plate (2203) is slidably installed in the empty slot (2202). A second bolt (2204) is threadedly installed on the square block (2201). The second bolt (2204) is rotatably connected to the fixed pressing plate (2203). Chute two (2205) for cooperating with the sliding of the fixed pressing plate (2203) is provided on both the left and right sides of the square block (2201).

5. The cleaning device for column-beam weld seams according to claim 1, characterized in that: The driving structure (25) includes a driving motor (27) and a bearing seat (31). The driving motor (27) is fixedly installed on a support member connected to the base (1). A transmission frame (28) is fixedly connected to the output shaft of the driving motor (27). A bearing frame (29) is fixedly connected to the transmission frame (28). A transmission ring (30) is fixedly installed on the outside of the bearing frame (29).

6. The cleaning device for column-beam weld seams according to claim 5, characterized in that: The bearing seat (31) is fixedly installed on the base (1). An opening slot is provided at the top of the bearing seat (31). A curved slot (32) for the transmission ring (30) to rotate is provided inside the bearing seat (31). A cavity is also provided inside the bearing seat (31). The bottom of the curved slot (32) communicates with the cavity of the bearing seat (31). The bottom of the transmission ring (30) extends into the cavity of the bearing seat (31). A transmission rod (33) is rotatably installed in the cavity of the bearing seat (31). A transmission structure is formed between the transmission rod (33) and the transmission ring (30) through mutual friction. A fourth motor (34) drivingly connected to the transmission rod (33) is fixedly installed in the cavity of the bearing seat (31).

7. A cleaning device for column-beam weld seams according to claim 1, characterized in that: The fixing component (26) includes a bearing frame (29). The cross-section of the bearing frame (29) is rectangular. A second spring (35) is fixedly installed on the inner wall of the bearing frame (29). A fixing block (36) is fixedly connected to the second spring (35). The fixing block (36) is an arc-shaped curved block.

8. The cleaning device for column-beam weld seams according to claim 1, characterized in that: Intervals are provided between multiple first moving blocks (8).

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