A high-pressure water jet plate and strip cleaning device and a water jet cleaning line

Abstract

The present invention discloses a high-pressure water jet plate and strip material cleaning device and a water jet cleaning line, wherein the high-pressure water jet plate and strip material cleaning device comprises a cleaning chamber, a flushing chamber, an abrasive tank, an abrasive collection box and a nozzle for spraying and cleaning the plate and strip material, the flushing chamber is arranged at the output end of the cleaning chamber, the abrasive collection box is arranged below the plate and strip material, the nozzle is connected to the abrasive tank arranged above the cleaning chamber, the nozzle faces the same width direction of the plate and strip material and is arranged in a gradient along the conveying direction of the cleaning chamber to cover the plate and strip material with a spray. The plate and strip material high-pressure water jet sandblasting cleaning device of the present invention has a simple and compact structure, low cost, convenient conveying, simple operation, high production efficiency, good surface cleaning effect, and the surface abrasive is easy to rinse and collect after cleaning without pollution.

Description

Technical Field

[0001] The invention relates to the technical field of sandblasting cleaning equipment, and in particular to a push-pull type high-pressure water jet plate strip flow cleaning device and a water jet cleaning line. Background Art

[0002] The existing methods for removing scales from the surface of wide plates and strips are: 1. Chemical method (i.e. pickling); 2. Mechanical cleaning (mainly bending peeling and friction removal); 3. Shot blasting. The above chemical methods will produce a large amount of industrial wastewater and waste gas, causing serious pollution to the environment, and the production efficiency is low. The surface quality of mechanical cleaning methods is not high and it is difficult to meet application requirements. Shot blasting will produce dust pollution, causing harm to workers' health, and consume a lot of power.

[0003] With the application of high-pressure water jet sandblasting cleaning production lines for metal strips in steel mills around the country, the method of removing scales on the surface of plates and strips using high-pressure water jet sandblasting descaling technology is gradually replacing the above chemical, mechanical and shot blasting processes or methods. In particular, the surface quality and hardness of medium and narrow-sized plates and strips produced by the high-pressure water jet sandblasting cleaning production line for metal strips are close to or even exceed those of medium and narrow-sized plates and strips produced by pickling and other processes. In addition, the high-pressure water jet sandblasting cleaning production line for metal strips produced using high-pressure water jet sandblasting descaling technology not only has no waste acid, waste water and waste residue emissions, is green and environmentally friendly, but also has high production efficiency and low operating costs.

[0004] However, since the application of high-pressure water jet sandblasting descaling technology is still limited to medium and narrow plates and strips of plain carbon steel with a width of less than or equal to 800mm and low surface quality requirements, most of the wide and thick plates and strips with high surface quality requirements that occupy a larger market in China and have higher technical added value are still descaled before cold rolling using highly polluting processes or methods such as chemical, mechanical and shot blasting, which is extremely harmful to both people and the environment. The existing high-pressure water jet sandblasting descaling technology and equipment adopts unwinding / rewinding continuous conveying. During cleaning, one side of the plate and strip is sandblasted and cleaned, and the other side is supported by a metal plate to prevent the continuous vibration of the plate and strip caused by the impact of high-pressure water jet sandblasting from affecting the cleaning effect. This method is suitable for cleaning thin plates and strips and narrow plates and strips. For medium and thick steel strips (materials) and wide steel strips (materials) with high surface cleaning quality requirements, there are problems such as difficulty in smooth transportation, scratches on the surface, and uneven surface quality. In addition, the design and installation requirements of the entire production line are quite high, which is not conducive to industrial application and later maintenance. Summary of the invention

[0005] The object of the present invention is to provide a high-pressure water jet plate and strip cleaning device and a water jet cleaning line, so as to solve the above-mentioned problems.

[0006] To achieve the above-mentioned purpose, the present invention first discloses a high-pressure water jet plate and strip cleaning device, comprising a cleaning chamber, a flushing chamber, an abrasive tank, an abrasive collection box and a nozzle for spraying and cleaning the plate and strip, the flushing chamber is arranged at the output end of the cleaning chamber, the abrasive collection box is arranged below the plate and strip, the nozzle is connected to the abrasive tank, and the nozzle is arranged in a gradient manner toward the same width direction of the plate and strip and along the conveying direction of the cleaning chamber to cover the plate and strip with a spray.

[0007] Furthermore, the nozzles are arranged on both the upper and lower sides of the plate and strip material, and the nozzles are symmetrically arranged relative to the plate and strip material.

[0008] Furthermore, the nozzle sprays and diffuses on the plate and strip material to form a spray influence area, and the spray influence area includes a spray cleaning area that directly sprays and cleans the plate and strip material. The spray influence area formed by the nozzle that first enters above the plate and strip material is connected to or partially overlapped with the spray cleaning area formed by the nozzle that enters above the plate and strip material later.

[0009] Furthermore, both the input end of the cleaning chamber and the output end of the rinsing chamber are provided with a clamping and conveying mechanism for the push-pull plate strip, and the clamping and conveying mechanism includes a rolling conveying wheel that clamps up and down to roll the push-pull plate strip.

[0010] Furthermore, it also includes a plurality of groups of rollers for conveying plate and strip materials, the rollers are provided with rubber layers, the rollers form a conveying line for conveying the plate and strip materials, and side guide rollers with adjustable relative positions are provided on both sides of the conveying line.

[0011] Furthermore, two nozzles symmetrically arranged relative to the plate and strip material form a nozzle group, and multiple adjacent nozzle groups form a descaling unit. The rollers and lateral guide rollers are arranged at intervals along the conveyor line, and the descaling unit is arranged between the rollers and the lateral guide rollers. The direction of the nozzle is perpendicular to the movement direction of the plate and strip material.

[0012] Furthermore, any of the nozzles is mounted on a nozzle mounting adjustment mechanism capable of adjusting the mounting height and mounting angle of the nozzle, the nozzle mounting adjustment mechanism is mounted in the cleaning chamber, and the abrasive tank is arranged above the cleaning chamber.

[0013] Then, the present invention discloses a water jet cleaning line, comprising one or more high-pressure water jet plate and strip cleaning devices as described in the above scheme connected in sequence, and the output end of the water jet cleaning line is sequentially provided with a drying device and a detection device through which the plate and strip can pass.

[0014] Furthermore, the water jet cleaning line includes a forward jet cleaning line and a reverse jet cleaning line connected to each other, and the forward jet cleaning line and the reverse jet cleaning line each include one or more of the high-pressure water jet plate and strip cleaning devices connected in sequence, the nozzles in the forward jet cleaning line are oriented in the same width direction of the plate and strip, and the nozzles in the reverse jet cleaning line are oriented in the same width direction of the plate and strip, and the directions of the nozzles in the forward jet cleaning line and the reverse jet cleaning line are symmetrically arranged relative to a vertical plane perpendicular to the width direction of the plate and strip.

[0015] Furthermore, the nozzle groups in the water jet cleaning line are arranged in a gradient along the conveying direction of the water jet cleaning line.

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] The high-pressure water jet sandblasting cleaning device of the present invention balances the forces in the upper and lower directions of the plate and strip during the cleaning process by symmetrically arranging the sandblasting nozzles on the upper and lower sides of the plate and strip, thereby avoiding the sinking or upward tilting of the plate and strip surface caused by the unidirectional sandblasting impact force. The nozzles are arranged with a gradient inclination along the conveying direction, so that the sand or steel shot sprayed by the previous nozzle will not be left in the spray cleaning area of ​​the next nozzle, that is, the adjacent nozzles do not interfere with each other and are cleaned in sequence, so that the cleaning process is stable and controllable. At the same time, through the rollers and the clamping mechanism, the conveying of the plate and strip is more stable and simple, and the rolling friction with the rollers is maintained during the conveying process, thereby avoiding scratches and damage to the surface of the plate and strip. The water jet cleaning line realizes the streamlined operation of cleaning-rinsing-drying-detecting of the plate and strip, thereby improving the cleaning efficiency of the plate and strip; and the surface quality of the plate and strip is improved by the cleaning arrangement in the positive and negative directions. At the same time, the present invention has a simple and compact structure, low cost, convenient transportation, simple operation, high production efficiency, good surface cleaning effect, and the surface abrasive is easy to rinse and collect after cleaning without pollution.

[0018] The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 It is a schematic front view of a high-pressure water jet plate and strip cleaning device disclosed in an embodiment of the present invention;

[0021] Figure 2 is a schematic front view of a water jet cleaning line disclosed in an embodiment of the present invention;

[0022] Figure 3It is a left schematic view of a high-pressure water jet plate and strip cleaning device disclosed in an embodiment of the present invention;

[0023] Figure 4 is a working schematic diagram of the nozzle group disclosed in an embodiment of the present invention;

[0024] Figure 5 1 is a first top view schematic diagram of a water jet cleaning line disclosed in an embodiment of the present invention (the spraying directions of the spray head groups are opposite);

[0025] Figure 6 yes Figure 5 A magnified schematic diagram of point A;

[0026] Figure 7 It is a second top view schematic diagram of the water jet cleaning line disclosed in an embodiment of the present invention (when cleaning the plate strip 10 with a width of N*B).

[0027] Legend:

[0028] 1. Clamping mechanism; 2. Cleaning chamber; 3. Descaling unit; 4. Nozzle group; 5. Abrasive tank; 6. Nozzle installation and adjustment mechanism; 7. Flushing chamber; 8. Abrasive collection box; 9. Nozzle; 10. Plate and strip material; 11. Support roller; 12. Lateral guide roller; 13. Drying device; 14. Detection device; 15. Rolling conveyor wheel; 16. Spray cleaning area; 17. Spray impact area. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0030] like Figure 1-Figure 7As shown, the present invention first discloses a high-pressure water jet plate and strip cleaning device, including a cleaning chamber 2, a flushing chamber 7, an abrasive tank 5, an abrasive collecting box 8, a nozzle 9 and a clamping mechanism 1, the flushing chamber 7 is arranged at the output end of the cleaning chamber 2, and the input end of the cleaning chamber 2 and the output end of the flushing chamber 7 are both provided with a clamping mechanism 1 for pushing and pulling the plate and strip 10 (in this embodiment, the clamping mechanism 1 is realized by pressing with rolling conveying wheels 15 symmetrically arranged up and down and then pushing by rolling. Compared with other conveying methods, the conveying method of the rolling conveying wheels 15 can ensure that when the high-pressure water jet generates a large lateral thrust and impact force, the rolling conveying wheels 15 arranged up and down can still ensure that the plate and strip 10 is clamped during the entire conveying process, further reducing the lateral displacement or vibration of the plate and strip 10 and other factors that affect the surface cleaning quality of the plate and strip 10), and at the same time, the process of pushing and pulling the plate and strip 10 is realized to ensure the continuity of the movement process of the plate and strip 10. The nozzle 9 is connected to the abrasive tank 5, and the abrasive tank 5 is arranged above the cleaning chamber 2, so as to facilitate the delivery of a water jet containing sand or steel shots to the nozzle 9, and the nozzle 9 is symmetrically arranged relative to the plate and strip material 10 passing through the cleaning chamber 2, and the abrasive collection box 8 is arranged at the bottom of the cleaning chamber 2.

[0031] In this embodiment, any nozzle 9 is mounted on a nozzle mounting adjustment mechanism 6 that can adjust the installation height and installation angle of the nozzle 9. The nozzle mounting adjustment mechanism 6 is installed in the cleaning chamber 2 (wherein the nozzle mounting adjustment mechanism 6 is a simple mechanical adjustment such as a screw and a nut, or can be a motor-driven automatic adjustment mechanism for lifting or deflection). The nozzle mounting adjustment mechanism 6 can be used to adjust the inclination angle α and the target distance L2 of the nozzle 9, see Figure 4 Two nozzles 9 symmetrically arranged relative to the plate and strip material 10 passing through the cleaning chamber 2 form a nozzle group 4, and the nozzles 9 of the nozzle group 4 are inclined at the same inclination angle toward the width direction of the plate and strip material 10 passing through the cleaning chamber 2, that is, the upper and lower nozzles 9 of the plate and strip material 10 are symmetrically distributed relative to the symmetry planes of the upper and lower surfaces of the plate and strip material 10, and the upper nozzle 9 forms an inclination angle α and a target distance L2 with the upper surface and the inclination angle and target distance with the lower nozzle 9 with the lower surface. The impact force formed by the upper and lower nozzles 9 on the plate and strip material 10 is parallel to the width direction of the plate and strip material 10, thereby realizing lateral counter-blasting cleaning of the upper and lower surfaces of the plate and strip material 10, so that the impact force of the nozzle group 4 has no effect on the sinking or warping of the surface of the plate and strip material 10.

[0032] In this embodiment, multiple groups of rollers 11 for conveying the plate and strip materials 10 are also included. The rollers 11 form a conveying line for conveying the plate and strip materials 10. Side guide rollers 12 with adjustable relative positions are arranged on both sides of the conveying line. The rotating roller surfaces of the rollers 11 and the side guide rollers 12 are provided with rubber layers to prevent scratches on the plate and strip materials 10 during the conveying process. The side guide rollers 12 with adjustable relative positions can adapt to plate and strip materials 10 of different widths. The clamping mechanism 1 is arranged before and after the cleaning chamber 2 to provide a smooth and continuous conveying power to the plate and strip materials 10, and the rollers 11 support the smooth conveying of the plate and strip materials 10. Under the impact force of the high-pressure water jet sandblasting, the plate and strip materials 10 will have a tendency to deviate to one side, and the side guide rollers 12 are arranged to prevent the expansion of this deviation tendency. The clamping mechanism 1, the side guide rollers 12 and the rollers 11 cooperate with each other to achieve the smooth conveying of the plate and strip materials 10.

[0033] In the present embodiment, the nozzle group 4 is arranged with a uniform gradient along the length direction of the plate and strip material 10 passing through the cleaning chamber 2, the nozzles 9 of the nozzle group 4 are all oriented in the same width direction of the plate and strip material 10, and the nozzles 9 spray and diffuse on the plate and strip material 10 to form a spray influence area 17, and the spray influence area 17 includes a spray cleaning area 16 that directly sprays and cleans the plate and strip material 10, wherein the spray cleaning area 16 is an area where the sand or steel shot sprayed by the nozzle 9 directly acts and cleans the plate and strip material 10, and is directly opposite to the spray direction of the nozzle 9, and the spray influence area 17 is formed by the water jet containing sand or steel shot sprayed by the nozzle 9 and diffuses outward after colliding with the plate and strip material 10. In the present embodiment, the spray influence area 17 formed by the nozzle 9 that first enters the upper part of the plate and strip material 10 is connected to or partially overlaps with the spray cleaning area 16 formed by the nozzle 9 that enters the upper part of the plate and strip material 10 later. Figure 6As shown, this can strictly ensure that the sand or steel shot sprayed by the previous nozzle 9 (i.e., the nozzle 9 that first enters the plate and strip material 10) will not be left in the spraying area of ​​the next nozzle 9 (i.e., the nozzle 9 that enters the plate and strip material 10 later), thereby affecting the surface cleaning quality of the plate and strip material 10 by the next nozzle 9 (when the nozzle 9 starts to spray, the more sand or steel shot there is in the spray cleaning area 16 of the plate and strip material 10, the water jet will act on the sand or steel shot left in the area, and the effect of the spray treatment will be worse due to the obstruction of the sand or steel shot left in the area), that is, the spraying of adjacent nozzles 9 does not interfere with each other, and the cleaning is carried out in sequence, so that the cleaning process is uniform, stable and controllable. In the specific setting, considering factors such as process and installation accuracy, the spray cleaning area 16 and the spray influence area 17 formed by two adjacent nozzles 9 are partially overlapped in the width direction of the plate and strip material 10, so as to ensure that the junction of the two areas can be cleaned and avoid the existence of uncleaned blind areas at the junction of the two areas. At the same time, the spraying width of the nozzle group 4 is greater than the width of the plate and strip 10, that is, the sandblasting cleaning area of ​​the nozzle 9 in the cleaning chamber 2 is controlled to be slightly wider than the width B of the plate and strip 10, and the sandblasting cleaning can cover a certain side surface of the plate and strip 10, so that the cleaning operation can also be completed on the edge of the plate and strip 10, so that a single cleaning chamber 2 can complete the sandblasting cleaning of the upper, lower and side surfaces of the plate and strip 10 with a width of B.

[0034] In this embodiment, a plurality of adjacent nozzle groups 4 form a descaling unit 3, wherein the roller edge spacing of the rollers 11 is designed based on the fact that the plate strip 10 can be smoothly conveyed from the previous roller 11 to the next roller 11 during sandblasting cleaning, and the sandblasting of the descaling unit 3 will not directly impact the rollers 11 and the lateral guide rollers 12, thereby avoiding scouring and damage to the rollers 11 and the lateral guide rollers 12 by the high-pressure water jet. The rollers 11 and the lateral guide rollers 12 are arranged at intervals along the conveying line, and the rollers 11 and the lateral guide rollers 12 are arranged close to each other, and the descaling unit 3 is arranged between the rollers 11 and the lateral guide rollers 12.

[0035] Then, an embodiment of the present invention discloses a water jet cleaning line, comprising one or more (two, three, four or other multiple numbers, multiple forms of arrangement and combination) high-pressure water jet plate and strip cleaning devices connected in sequence, and the output end of the water jet cleaning line is sequentially provided with a drying device 13 and a detection device 14 through which the plate and strip 10 can pass. The residual abrasive on the surface of the plate and strip 10 is rinsed clean in the rinse chamber 7 in the cleaning chamber 2, and the abrasive in each cleaning chamber 2 is circulated and supplied independently. The drying device 13 is located at the rear end of the last clamping mechanism 1 and before the detection device 14. The drying device 13 is used to remove the residual water stains after cleaning, so as to facilitate the online detection of the plate and strip 10 and the next step of the plate and strip 10. The detection device 14 performs real-time detection on the surface of the plate and strip 10 after cleaning and drying, and timely adjusts the parameters such as pressure, target distance, and spray angle α through the control system or the operator, so as to ensure the production of wide and thick plate and strip 10 with high surface quality.

[0036] In this embodiment, the water jet cleaning line includes a forward jet cleaning line and a reverse jet cleaning line connected to each other, and each of the forward jet cleaning line and the reverse jet cleaning line includes one or more high-pressure water jet plate strip cleaning devices connected in sequence (the specific number depends on the size of the plate strip 10, the difficulty of cleaning the surface of the plate strip 10, and the quality requirements for cleaning the surface of the plate strip 10). The nozzles 9 in the forward jet cleaning line face the same width direction of the plate strip 10, and the nozzles 9 in the reverse jet cleaning line face the same width direction of the plate strip 10. The nozzles 9 in the forward jet cleaning line and the reverse jet cleaning line are symmetrically arranged relative to the vertical plane perpendicular to the width direction of the plate strip 10. That is, the number of nozzles 9 in the front and rear high-pressure water jet plate strip cleaning devices is the same, but the sandblasting cleaning directions are opposite, so that the upper and lower surfaces of the plate strip 10 are cleaned twice in opposite directions by sandblasting, so that the surface quality of the cleaned plate strip 10 is more uniform, meeting the high requirements of the plate strip 10 for surface cleaning quality. Furthermore, when the thickness of the plate strip 10 is relatively large, the two side surfaces of the plate strip 10 can be cleaned by sandblasting in turn in the front and rear two high-pressure water jet plate strip cleaning devices.

[0037] In this embodiment, optionally, the water jet cleaning line can also be configured as follows: the nozzle group 4 is arranged evenly along the conveying direction gradient of the water jet cleaning line. When a single cleaning chamber 2 completes the sandblasting cleaning of a plate and strip material 10 with a width of B, by arranging N high-pressure water jet plate and strip cleaning devices in series, a plate and strip material 10 with a width of N*B can be cleaned, thereby realizing sandblasting cleaning of plate and strip materials 10 with different width specifications.

[0038] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-pressure water jet plate and strip cleaning device, characterized in that: The invention comprises a cleaning chamber (2), a flushing chamber (7), an abrasive tank (5), an abrasive collecting box (8) and a nozzle (9) for spray cleaning the plate and strip material (10), wherein the flushing chamber (7) is arranged at the output end of the cleaning chamber (2), the abrasive collecting box (8) is arranged below the plate and strip material (10), the nozzle (9) is connected to the abrasive tank (5), the nozzle (9) is arranged in a gradient manner in the same width direction of the plate and strip material (10) and along the conveying direction of the cleaning chamber (2) so as to spray the plate and strip material (10); the nozzle (9) sprays and diffuses on the plate and strip material (10) to form a spraying influence area (17), wherein the spraying influence area (17) includes a spraying cleaning area (16) for directly spraying and cleaning the plate and strip material (10), and the spraying influence area (17) formed by the nozzle (9) that first enters above the plate and strip material (10) and the spraying influence area (17) that later enters the plate and strip material (10) The plate and strip material (10) is connected to or partially overlapped with the spray cleaning area (16) formed by the nozzle (9) above the plate and strip material (10); the nozzle (9) is arranged on both the upper and lower sides of the plate and strip material (10); the direction of the nozzle (9) is perpendicular to the movement direction of the plate and strip material (10); it also includes a plurality of groups of rollers (11) for conveying the plate and strip material (10), and the rollers (11) form a conveying line for conveying the plate and strip material (10); side guide rollers (12) with adjustable relative positions are arranged on both sides of the conveying line; the nozzle (9) is symmetrically arranged relative to the plate and strip material (10); the spray cleaning area (16) is the area where the sand or steel shot sprayed by the nozzle (9) directly acts and has a cleaning effect, and the spray cleaning area (16) is directly opposite to the spray direction of the nozzle (9), and the spray impact area (17) is formed by the water jet with sand or steel shot sprayed by the nozzle (9) colliding with the plate and strip material (10) and then spreading outward.

2. The high-pressure water jet plate and strip cleaning device according to claim 1 is characterized in that: The input end of the cleaning chamber (2) and the output end of the rinsing chamber (7) are both provided with a clamping mechanism (1) for the push-pull plate strip (10), and the clamping mechanism (1) comprises a rolling conveying wheel (15) that clamps up and down to roll the push-pull plate strip (10).

3. The high-pressure water jet plate and strip cleaning device according to any one of claims 1-2, characterized in that: The roller (11) is provided with a rubber layer.

4. The high-pressure water jet plate and strip cleaning device according to claim 3 is characterized in that: Two nozzles (9) symmetrically arranged relative to the plate strip (10) form a nozzle group (4), and a plurality of adjacent nozzle groups (4) form a descaling unit (3). The support rollers (11) and the lateral guide rollers (12) are arranged at intervals along the conveying line, and the descaling unit (3) is arranged between the support rollers (11) and the lateral guide rollers (12).

5. The high-pressure water jet plate and strip cleaning device according to claim 4 is characterized in that: Any of the nozzles (9) is mounted on a nozzle mounting adjustment mechanism (6) capable of adjusting the mounting height and mounting angle of the nozzle (9); the nozzle mounting adjustment mechanism (6) is mounted in the cleaning chamber (2); and the abrasive tank (5) is arranged above the cleaning chamber (2).

6. A water jet cleaning line, characterized in that: It comprises one or more high-pressure water jet plate and strip cleaning devices as described in any one of claims 1 to 5 connected in sequence, and the output end of the water jet cleaning line is sequentially provided with a drying device (13) and a detection device (14) through which the plate and strip (10) can pass.

7. The water jet cleaning line according to claim 6, characterized in that: The water jet cleaning line comprises a forward jet cleaning line and a reverse jet cleaning line which are connected to each other, and each of the forward jet cleaning line and the reverse jet cleaning line comprises one or more of the high-pressure water jet plate and strip cleaning devices which are connected in sequence, the nozzles (9) in the forward jet cleaning line face the same width direction of the plate and strip (10), and the nozzles (9) in the reverse jet cleaning line face the same width direction of the plate and strip (10), and the directions of the nozzles (9) in the forward jet cleaning line and the reverse jet cleaning line are symmetrically arranged relative to a vertical plane perpendicular to the width direction of the plate and strip (10).

8. The water jet cleaning line according to claim 6, characterized in that: The nozzle group (4) in the water jet cleaning line is arranged in a gradient along the conveying direction of the water jet cleaning line.

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