A device for removing oil after cold rolling of stainless steel coils

Abstract

The utility model discloses a kind of stainless steel roll oil removal devices after cold rolling, relate to stainless steel processing field.A kind of stainless steel roll oil removal devices after cold rolling, including support, the support is equipped with rinsing pool, rinsing pool is equipped with oil removal groove and cleaning tank, the side of rinsing pool is equipped with oil scraping mechanism close to oil removal groove, further include: for making stainless steel roll immerse in the oil removal groove and cleaning tank of conveying roller, rotationally connected in the oil removal groove and cleaning tank;Transition roller, rotationally connected in the position between oil removal groove, cleaning tank on the upper end of rinsing pool, and it is triangularly distributed between two the conveying roller;The utility model is through the bubble generated by air pump and air jet ring, in oil removal groove and cleaning tank to stainless steel roll side edge is cleaned specifically, loosens and peels off side edge attached cold rolling oil, effectively solve the problem of side edge oil stain residue, make stainless steel roll whole oil removal more uniform, thoroughly.

Description

Technical Field

[0001] This utility model belongs to the field of stainless steel processing technology, specifically, it relates to a degreasing device for stainless steel coils after cold rolling. Background Technology

[0002] In the cold rolling process of stainless steel, cold rolling oil is applied to the surface of the stainless steel coil to reduce friction between the rolls and the stainless steel strip, remove the heat generated by rolling, and prevent the strip from sticking. After cold rolling, a large amount of cold rolling oil will remain on the surface of the stainless steel coil (including the upper and lower surfaces and sides). If it is not effectively removed, it will have serious adverse effects on subsequent heat treatment, coating, welding and other processes. For example, during heat treatment, the oil will carbonize and form black spot defects; during coating, it will affect the adhesion; and during welding, it will reduce the welding quality. Therefore, degreasing the stainless steel coil after cold rolling is a crucial step in the cold rolling production process.

[0003] However, in existing technologies, the removal of cold-rolling oil from the surface of cold-rolled stainless steel coils typically involves a process of first scraping off the oil, then rinsing with chemicals, followed by water washing, hot air drying, and finally leveling and rewinding. In the oil scraping stage, a scraper is often used to scrape the oil from the surface of the stainless steel coil. This method causes the cold-rolling oil to move from the center of the coil to the sides, eventually leaving the surface. However, because stainless steel coils have a certain thickness, the oil that has moved to the sides easily adheres to the side walls. When the stainless steel coil, after oil scraping, enters the rinsing tank for rinsing, the surface of the stainless steel coil is often already clean. The stainless steel coil is clean, but some cold-rolling oil still adheres to the sides and corners. The cold-rolling oil residue on the sides of the stainless steel coil will continue to affect the product quality in subsequent processes. For example, during coating treatment, the oil residue on the sides will cause insufficient adhesion of the coating at the sides, making the coating prone to peeling. During welding, the oil residue on the sides will interfere with the stability of the welding arc and reduce the strength and density of the weld joint. Therefore, effectively removing the cold-rolling oil from the sides of the stainless steel coil is of great necessity to ensure the overall degreasing effect of the stainless steel coil and the quality of subsequent processing. In view of this, this utility model is proposed. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a degreasing device for stainless steel coils after cold rolling that can overcome or at least partially solve the above problems.

[0005] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by this utility model is as follows: a stainless steel coil degreasing device after cold rolling, including a support frame, a rinsing tank installed on the support frame, an degreasing tank and a cleaning tank provided in the rinsing tank, an oil scraping mechanism provided on the side of the rinsing tank near the degreasing tank, and further including: a conveying roller for immersing the stainless steel coil in the degreasing tank and the cleaning tank, rotatably connected in the degreasing tank and the cleaning tank; a transition roller, rotatably connected at the upper end of the rinsing tank between the degreasing tank and the cleaning tank, and triangularly distributed between the two conveying rollers; air jet rings, symmetrically sleeved on both sides of the conveying rollers and fixedly connected to the rinsing tank, the two air jet rings on the same side being interconnected by a connecting air pipe, and air jet holes being equidistantly opened on the side of the air jet ring near the conveying roller; and an air pump for supplying air to the air jet rings, provided on the rinsing tank.

[0006] Furthermore, the oil scraping mechanism includes a housing and triangular scrapers. A support platform is fixedly connected to the side of the rinsing tank near the degreasing tank. The housing is fixedly installed on the support platform. The triangular scrapers are symmetrically fixedly connected to the housing. The housing has symmetrical openings on both sides, with the openings located in the middle of the two triangular scrapers. An oil drain is provided on the lower side of the housing away from the rinsing tank. The lower interior of the housing has an inclined surface for guiding the cold-rolled oil towards the oil drain.

[0007] To further protect the stainless steel coil, a receiving roller is rotatably connected to the box near the opening to prevent the stainless steel coil from contacting the edges of the opening.

[0008] To further enhance the fluidity of the cold rolling oil and to preheat the stainless steel coils, the chamber is a heating chamber.

[0009] To ensure the gas pressure entering the solution in the degreasing tank, the air pump is further installed on the side of the rinsing tank near the degreasing tank and fixedly mounted on the housing.

[0010] To further reduce the influence of gas on the temperature of the solution, the air pump is further provided with a fixed suction pipe inserted into the box body at the suction end, and a fixed three-way air pipe at the outlet end of the air pump. Both outlets of the three-way air pipe are fixedly connected to air supply pipes, and the outlet of the air supply pipe is connected to the inlet of the adjacent air jet ring.

[0011] To further enhance the degreasing and cleaning effect of air bubbles on stainless steel coils, a booster nozzle is fixedly connected to the air jet hole of the air jet ring.

[0012] To further reduce the difficulty and safety risks of stainless steel coil laying operations, the degreasing tank and cleaning tank are further provided with sliding grooves at both ends near the conveyor roller. A slider that is fixedly connected to the end of the conveyor roller is slidably connected in the sliding groove. An electro-hydraulic telescopic rod is fixedly connected to the upper end of the sliding groove. The telescopic end of the electro-hydraulic telescopic rod is fixedly connected to the adjacent slider. The air jet ring is provided with a notch that cooperates with the rotating shafts at both ends of the conveyor roller.

[0013] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: The present invention uses air pump and air jet ring to generate bubbles to clean the side of stainless steel coil in the degreasing tank and cleaning tank, loosening and peeling off the cold rolling oil attached to the side, effectively solving the problem of oil residue on the side, and making the overall degreasing of stainless steel coil more uniform and thorough.

[0014] Meanwhile, the bubbles can also peel off residual cold rolling oil from the surface of the stainless steel coil and remove oil from the surface of the conveyor rollers, preventing secondary contamination of the stainless steel coil by oil. At the same time, in the cleaning tank, the bubbles enhance the washing effect, reduce washing time and the amount of cleaning solution used, and improve washing efficiency and cleanliness.

[0015] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0016] In the attached diagram: Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of a portion of the structure of this utility model; Figure 4 This is a schematic diagram of the internal structure of the box body of this utility model.

[0017] In the diagram: 1. Support frame; 2. Rinse tank; 201. Degreasing tank; 202. Cleaning tank; 203. Slide chute; 204. Electro-hydraulic telescopic rod; 205. Sliding block; 206. Transition roller; 3. Oil scraping mechanism; 301. Box body; 302. Through port; 303. Receiving roller; 304. Triangular scraper; 305. Oil drain port; 306. Inclined surface; 4. Conveying roller; 5. Air jet ring; 501. Notch; 502. Pressure boosting nozzle; 503. Connecting air pipe; 6. Air pump; 601. Three-way air pipe; 602. Air delivery pipe; 7. Support platform. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0019] Example: like Figures 1-4 The diagram shows a degreasing device for cold-rolled stainless steel coils, comprising a support 1, a rinsing tank 2 mounted on the support 1, an degreasing tank 201 and a cleaning tank 202 within the rinsing tank 2, and an oil scraping mechanism 3 on the side of the rinsing tank 2 near the degreasing tank 201. It also includes: conveying rollers 4 for immersing the stainless steel coils in the degreasing tank 201 and the cleaning tank 202, rotatably connected within the degreasing tank 201 and the cleaning tank 202; transition rollers 206 rotatably connected at the upper end of the rinsing tank 2, positioned between the degreasing tank 201 and the cleaning tank 202, and triangularly distributed with the two conveying rollers 4; air jet rings 5 ​​symmetrically sleeved on both sides of the conveying rollers 4 and fixedly connected to the rinsing tank 2, with the two air jet rings 5 ​​on the same side connected to each other via connecting air pipes 503, and air jet holes equidistantly spaced on the side of the air jet rings 5 ​​near the conveying rollers 4; and an air pump 6 for supplying air to the air jet rings 5, mounted on the rinsing tank 2.

[0020] The oil scraping mechanism 3 includes a housing 301 and triangular scrapers 304. A support platform 7 is fixedly connected to the side of the rinsing tank 2 near the degreasing tank 201. The housing 301 is fixedly installed on the support platform 7. The triangular scrapers 304 are symmetrically fixedly connected inside the housing 301. The housing 301 has symmetrical openings 302 on both sides. The openings 302 are located in the middle of the two triangular scrapers 304. An oil drain port 305 is opened on the lower side of the housing 301 away from the rinsing tank 2. An inclined surface 306 is provided at the lower end of the interior of the housing 301 to guide the cold rolling oil to the oil drain port 305.

[0021] When degreasing cold-rolled stainless steel coils, the coils are first unwound, and the end of the coil passes through the opening 302 of the oil scraping mechanism 3 and moves between two triangular scrapers 304. At this time, the triangular scrapers 304 will initially scrape off the cold-rolled oil on the upper and lower surfaces of the stainless steel coil. The scraped cold-rolled oil is guided by the inclined surface 306 inside the housing 301 and flows to the oil outlet 305 for discharge. Workers can place an oil collection bucket below the oil outlet 305 in advance to collect the cold-rolled oil, so that the cold-rolled oil can be recycled and reused, reducing the waste of resources.

[0022] After the stainless steel coil is removed from the housing 301, it can then pass through the degreasing tank 201 and the cleaning tank 202 in sequence under the action of the conveying roller 4 and the transition roller 206.

[0023] When the stainless steel coil, after being pretreated by scraping oil, enters the degreasing tank 201 filled with a high-temperature (usually 50-80°C) alkaline cleaning agent via the conveyor roller 4, the air pump 6 can be started to supply air to the air jet ring 5. The gas forms bubbles through the air jet holes and is sprayed onto the stainless steel coil. The bubbles first spray onto the side of the stainless steel coil, loosening and peeling off any cold rolling oil that may be attached to the side. At the same time, they also peel off any residual cold rolling oil on the surface of the stainless steel coil and remove the oil attached to the surface of the conveyor roller 4, achieving a more thorough degreasing treatment and improving the degreasing effect of the cleaning solution in the degreasing tank 201 on the stainless steel coil.

[0024] After the stainless steel coil is treated in the degreasing tank 201, it enters the washing solution in the cleaning tank 202 through the transition roller 206 (which is triangularly distributed with the two conveying rollers 4 to optimize the conveying path and soaking effect). The temperature of the cleaning water in the cleaning tank 202 can be set to be the same as the temperature of the alkaline cleaning agent in the degreasing tank 201. The air pump 6 continuously supplies air. Since the air jet ring 5 in the degreasing tank 201 and the air jet ring 5 in the cleaning tank 202 are connected to each other through the connecting air pipe 503, bubbles will also be generated in the cleaning tank 202 at the same time. This will further improve the cleanliness of the water washing when the stainless steel coil is washed, and ensure that the cleaning solution and small amount of oil residue on the surface and sides of the stainless steel coil are completely removed.

[0025] After exiting the cleaning tank 202, the stainless steel coils enter the subsequent water washing process (this step can be simplified if the water washing in the cleaning tank 202 is clean enough) to further remove any remaining cleaning solution and other impurities.

[0026] Next, the washed stainless steel coils are placed into a hot air drying box (not shown in the figure, but can be equipped in actual use. Since it is a mature existing technology in degreasing equipment, it is not described in detail in this article). High temperature and high pressure hot air is used to completely dry the surface moisture and prevent rusting.

[0027] After drying, the stainless steel coils are leveled by a leveling machine (not shown in the figure, which, like the hot air drying box, is a mature existing technology in degreasing equipment), and finally rolled into new steel coils, thus completing the entire degreasing and subsequent processing process.

[0028] In existing technologies, scraping oil with a scraper can easily cause cold rolling oil to adhere to the side wall of the stainless steel coil, resulting in oil residue on the edges and corners during subsequent rinsing. This device uses air bubbles generated by the air pump 6 and the air jet ring 5 to specifically clean the sides of the stainless steel coil in the degreasing tank 201 and the cleaning tank 202, loosening and peeling off the cold rolling oil adhering to the sides, effectively solving the problem of oil residue on the sides, and making the overall degreasing of the stainless steel coil more uniform and thorough.

[0029] Meanwhile, the bubbles can also peel off the residual cold rolling oil on the surface of the stainless steel coil and remove the oil from the surface of the conveyor roller 4, preventing secondary contamination of the stainless steel coil by the oil. At the same time, in the cleaning tank 202, the bubbles enhance the washing effect, reduce the washing time and the amount of cleaning solution used, and improve the washing efficiency and cleanliness.

[0030] like Figure 1 , Figure 4 As shown, a receiving roller 303 is rotatably connected to the housing 301 near the opening 302 to prevent the stainless steel coil from contacting the edges and corners of the opening 302.

[0031] By setting the receiving roller 303, it can play a supporting and guiding role when the stainless steel coil passes through the through-hole 302, so that the stainless steel coil does not directly contact the edges and corners of the through-hole 302 during the movement. In this way, it can not only avoid the edges and corners of the through-hole 302 from scratching the surface of the stainless steel coil and protect the surface smoothness of the stainless steel coil, but also make the stainless steel coil enter the two triangular scraper strips 304 more smoothly for oil scraping pretreatment, ensuring the stability and efficiency of the oil scraping process.

[0032] Furthermore, the housing 301 is a heating box, wherein the heating component provided in the housing 301 can be an electric heating tube embedded in the housing 301, or an electric heating resistance wire.

[0033] By heating the interior of the chamber 301, the cold-rolled oil inside can be heated, reducing its viscosity and increasing its fluidity, making it easier for the triangular scraper 304 to remove it cleanly. This improves the efficiency and effectiveness of the oil removal pretreatment. At the same time, the heating chamber can preheat the stainless steel coils that pass through, allowing them to quickly reach a temperature that matches the cleaning solution in the degreasing tank 201. This reduces local temperature fluctuations in the cleaning solution caused by large temperature differences, ensuring the stability of the chemical degreasing reaction (such as saponification and emulsification) and further improving the degreasing effect.

[0034] like Figure 1 , Figure 2 As shown, the air pump 6 is located on the side of the rinsing tank 2 near the degreasing tank 201 and is fixedly installed on the housing 301.

[0035] By placing the air pump 6 on the side of the rinsing tank 2 near the degreasing tank 201 and fixing it on the housing 301, the gas delivery path between the air pump 6 and the air jet ring 5 in the degreasing tank 201 can be shortened to the minimum, reducing the pressure loss of gas during transmission. This ensures that the compressed gas enters the air jet ring 5 in the degreasing tank 201 with sufficient pressure first. Sufficient gas pressure allows the air jet ring 5 to spray more densely and with stronger impact through the air jet holes, which can more efficiently loosen and peel off the cold rolling oil remaining on the side and surface of the stainless steel coil, and also better remove the oil adhering to the surface of the conveyor roller 4. This lays a good foundation for further processing in the subsequent cleaning tank 202 and avoids the problem of incomplete degreasing caused by insufficient air jet pressure in the degreasing tank 201.

[0036] like Figure 1 , Figure 2 , Figure 3 As shown, the air pump 6 has a fixed suction end connected to a suction pipe inserted into the housing 301, and the air pump 6 has a fixed outlet end connected to a three-way air pipe 601. Both outlets of the three-way air pipe 601 are fixedly connected to air supply pipes 602, and the outlet of the air supply pipe 602 is connected to the inlet of the adjacent jet ring 5.

[0037] The air pump 6 extracts gas from the chamber 301 through the extraction pipe, and simultaneously supplies gas to the jet ring 5 through the three-way air pipe 601 and the air supply pipe 602, realizing the secondary utilization of heat inside the chamber 301. Since the chamber 301 is a heating chamber, it retains heat used for heating cold rolling oil and preheating stainless steel coils. After the air pump 6 extracts this part of the hot gas, it is directly delivered to the jet ring 5 through the three-way air pipe 601 and the air supply pipe 602, so that the gas entering the jet ring 5 itself has a certain temperature. When the gas with temperature enters the solution in the degreasing tank 201 and the cleaning tank 202 through the jet hole, it can effectively reduce the local temperature drop caused by the low temperature gas rushing into the solution, avoid large fluctuations in solution temperature, and thus ensure the stability of the chemical degreasing reaction (such as saponification and emulsification) in the degreasing tank 201. At the same time, it can also maintain the relatively constant water washing temperature in the cleaning tank 202, further improving the overall degreasing effect and efficiency, and also reducing the energy consumption required for additional heating of the solution, realizing the efficient utilization of energy.

[0038] like Figure 3 As shown, a pressurized nozzle 502 is fixedly connected to the jet hole of the jet ring 5.

[0039] A booster nozzle 502 is fixedly connected to the air jet hole of the air jet ring 5, which can further boost the gas delivered to the air jet ring 5 by the air pump 6, thereby increasing the pressure and flow rate of the gas when it is ejected. When the high-pressure airflow acts on the surface and sides of the stainless steel coil through the booster nozzle 502, it will produce a stronger impact effect. This can loosen and peel off the stubborn cold rolling oil attached to the sides of the stainless steel coil more quickly and thoroughly, and can also remove the oil stains remaining on its surface more efficiently. At the same time, the cleaning effect on the oil attached to the surface of the conveyor roller 4 will also be significantly enhanced. In addition, the bubbles formed by the boosted airflow are smaller and more evenly distributed, and the contact area with the cleaning solution in the degreasing tank 201 and the water washing solution in the washing tank 202 is larger. This can further enhance the gas-liquid synergistic degreasing and water washing effect, reduce the risk of oil stains remaining, and provide a cleaner surface condition for the subsequent processing of the stainless steel coil.

[0040] like Figure 1 , Figure 2 As shown, the degreasing tank 201 and the cleaning tank 202 are both provided with sliding grooves 203 at both ends near the conveying roller 4. The sliding grooves 203 are slidably connected to the sliders 205 which are fixedly connected to the ends of the conveying roller 4. The upper end of the sliding grooves 203 is fixedly connected to the electric hydraulic telescopic rod 204. The telescopic end of the electric hydraulic telescopic rod 204 is fixedly connected to the adjacent slider 205. The air jet ring 5 is provided with a notch 501 that is used to cooperate with the rotating shafts at both ends of the conveying roller 4.

[0041] The inclusion of sliding grooves 203, sliders 205, and electro-hydraulic telescopic rods 204 at both ends of the degreasing tank 201 and the cleaning tank 202 facilitates the laying and winding of stainless steel coils before degreasing. Specifically, when laying the stainless steel coils before the degreasing operation begins, the extension of the electro-hydraulic telescopic rod 204 drives the sliders 205 to slide upwards along the sliding grooves 203, thereby moving the conveyor roller 4 upwards out of the liquid surface of the degreasing tank 201 and the cleaning tank 202. This allows workers to more clearly observe the position of the conveyor roller 4 and more easily and accurately wind the stainless steel coils onto the conveyor roller 4 without having to enter the tank or come into contact with the solution, effectively reducing the difficulty of the laying operation. To mitigate safety risks, the electro-hydraulic telescopic rod 204 is synchronously controlled by the same controller, ensuring that the extension speed and stroke of the two telescopic rods are completely consistent. This avoids roller tilting caused by asynchronous lifting at both ends of the conveyor roller 4, ensuring that the conveyor roller 4 is always in a horizontal state. This prevents the stainless steel coil from shifting or wrinkling during winding or subsequent conveying, and also avoids the impact of the tilt of the conveyor roller 4 on the fit between the air jet ring 5 and the roller. The notch 501 on the air jet ring 5 provides sufficient space for the lifting and lowering of the conveyor roller 4, avoiding structural interference between the conveyor roller 4 and the air jet ring 5, and ensuring the smoothness and stability of the overall device operation.

[0042] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0043] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model.

Claims

1. A degreasing device for cold-rolled stainless steel coils, comprising a support (1), a rinsing tank (2) mounted on the support (1), an degreasing tank (201) and a cleaning tank (202) provided in the rinsing tank (2), and an oil scraping mechanism (3) provided on the side of the rinsing tank (2) near the degreasing tank (201), characterized in that, Also includes: The conveying roller (4) used to immerse the stainless steel coil in the degreasing tank (201) and the cleaning tank (202) is rotatably connected in the degreasing tank (201) and the cleaning tank (202); The transition roller (206) is rotatably connected to the upper end of the rinsing tank (2) between the degreasing tank (201) and the cleaning tank (202), and is triangularly distributed between the two conveying rollers (4); Air jet rings (5) are symmetrically sleeved on both sides of the conveying roller (4) and fixedly connected to the rinsing tank (2). The two air jet rings (5) located on the same side are connected to each other through connecting air pipes (503). Air jet holes are equidistantly opened on the side of the air jet ring (5) near the conveying roller (4). An air pump (6) for supplying air to the jet ring (5) is installed on the rinsing tank (2).

2. The stainless steel coil degreasing device after cold rolling according to claim 1, characterized in that, The oil scraping mechanism (3) includes a housing (301) and triangular scrapers (304). A support platform (7) is fixedly connected to the side of the rinsing tank (2) near the degreasing tank (201). The housing (301) is fixedly installed on the support platform (7). The triangular scrapers (304) are symmetrically fixedly connected inside the housing (301). The housing (301) has symmetrical openings (302) on both sides. The openings (302) are located in the middle of the two triangular scrapers (304). An oil drain (305) is opened on the lower side of the housing (301) away from the rinsing tank (2). An inclined surface (306) is provided at the lower end of the interior of the housing (301) to guide the cold-rolled oil to the oil drain (305).

3. The stainless steel coil degreasing device after cold rolling according to claim 2, characterized in that, The housing (301) is rotatably connected to a receiving roller (303) near the opening (302) to prevent the stainless steel coil from contacting the edges of the opening (302).

4. The stainless steel coil degreasing device after cold rolling according to claim 2, characterized in that, The box (301) is a heating box.

5. The stainless steel coil degreasing device after cold rolling according to claim 4, characterized in that, The air pump (6) is located on the side of the rinsing tank (2) near the degreasing tank (201) and is fixedly installed on the housing (301).

6. The stainless steel coil degreasing device after cold rolling according to claim 5, characterized in that, The air pump (6) has a fixed suction end connected to a suction pipe inserted into the housing (301), and the air outlet end of the air pump (6) is fixedly connected to a three-way air pipe (601). Both air outlets of the three-way air pipe (601) are fixedly connected to air supply pipes (602), and the air outlet of the air supply pipe (602) is connected to the air inlet of the adjacent jet ring (5).

7. The stainless steel coil degreasing device after cold rolling according to claim 1, characterized in that, A booster nozzle (502) is fixedly connected to the jet hole of the jet ring (5).

8. The stainless steel coil degreasing device after cold rolling according to claim 1, characterized in that, The degreasing tank (201) and the cleaning tank (202) are provided with grooves (203) at both ends of the conveying roller (4). A slider (205) that is fixedly connected to the end of the conveying roller (4) is slidably connected in the grooves (203). An electric hydraulic telescopic rod (204) is fixedly connected to the upper end of the grooves (203). The telescopic end of the electric hydraulic telescopic rod (204) is fixedly connected to the adjacent slider (205). The jet ring (5) is provided with a notch (501) that is used to cooperate with the rotating shafts at both ends of the conveying roller (4).

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