Low-bath-ratio overflow dyeing machine

Abstract

The utility model discloses a low-bath-ratio overflow dyeing machine, and belongs to the technical field of dyeing machines, the technical scheme is that the low-bath-ratio overflow dyeing machine comprises a dyeing machine body, and the dyeing machine body comprises a dye liquor circulating mechanism, a dyeing machine body and a dyeing machine body, the filtering mechanism comprises a filtering box and a cleaning device; the dye vat comprises a cloth inlet and a cloth rotating roller; wherein the shell is provided with a dye liquor circulating cavity, and the longitudinal circulating devices are arranged in the dye liquor circulating cavity. The utility model provides a low-bath-ratio overflow dyeing machine which can reduce the bath ratio in the dyeing process, improve the leveling property while accelerating the dyeing efficiency, and filter floccules on the surface of fabric, thereby ensuring the dyeing effect of the dyeing machine.

Description

Technical Field

[0001] The present application belongs to the technical field of dyeing machines, and in particular relates to a low bath ratio overflow dyeing machine. Background Art

[0002] Overflow dyeing machine is a commonly used dyeing equipment in the textile field. The fabric generally circulates continuously in a loop formed by the cloth lifting wheel, nozzle, cloth guide tube and dyeing tank to achieve the purpose of continuous dyeing.

[0003] The existing Chinese patent with publication number CN211620843U discloses a high-temperature and high-pressure overflow dyeing machine, including a main cylinder, a back-spray ring, a cloth guide wheel, a nozzle and a cloth guide tube. The fabric accurately enters the nozzle through the guidance of the cloth guide wheel structure, and circulates in the main cylinder and the cloth guide tube through the spray pressure of the nozzle and the back-spray ring. The main cylinder is distributed with cloth ferry grooves throughout the entire section. The main cylinder is divided into sections, and the cloth ferry groove in the last section of the main cylinder is tilted upward at a certain angle.

[0004] The overflow dyeing machine reduces the dyeing bath ratio by changing the main structure and components of the dyeing machine, and at the same time reduces various consumptions and reduces production costs. However, after the bath ratio of the dyeing machine is reduced, the dyeing rate is accelerated, the fabric soaking time is reduced, and the amount of dyeing liquid is reduced, so that the fabric cannot be fully soaked, the levelness is reduced, and the dyeing machine cannot filter the flocs on the surface of the fabric, and the quality of the finished product is low. Utility Model Content

[0005] The purpose of the present application is to provide a low bath ratio overflow dyeing machine in response to the above-mentioned technical problems, which can reduce the bath ratio in the dyeing process, improve the levelness of dyeing while speeding up the dyeing efficiency, and filter the flocs on the surface of the fabric, thereby ensuring the dyeing effect of the dyeing machine.

[0006] The present application provides a low bath ratio overflow dyeing machine, including a dyeing machine body, wherein the dyeing machine body includes:

[0007] The dye liquor circulation mechanism comprises a shell and a longitudinal circulation device;

[0008] Filter mechanism, including filter box and cleaning device;

[0009] Dyeing vat, including cloth inlet and cloth transfer roller;

[0010] The shell is provided with a dye liquid circulation chamber, and a plurality of longitudinal circulation devices are provided, and the longitudinal circulation devices are placed in the dye liquid circulation chamber.

[0011] In the technical scheme, a dye liquid circulation mechanism with a shell and a longitudinal circulation device is arranged on the dyeing machine body, a dye liquid circulation chamber is opened in the shell, and a plurality of longitudinal circulation devices are installed in the dye liquid circulation chamber, and the liquid outlets of the longitudinal circulation devices are longitudinally distributed in the dye vat, and the plurality of longitudinal circulation devices spray the dye liquid at the bottom of the shell into the dye vat evenly, and the concentration of the dye liquid at the bottom is relatively uniform, so that the cloth in the dye vat can be evenly dyed, and the uniform dyeing property is improved. The dyeing machine body can repeatedly use the dye liquid through the dye liquid circulation mechanism, and the cloth can be dyed with less dye liquid, thereby reducing the bath ratio. A series of production costs have been reduced. A filtering mechanism with a filter box and a cleaning device is also provided on the dyeing machine body. When the dye liquid needs to be reused, impurities such as flocs on the surface of the cloth will be mixed inside. The staff will filter out the impurities in the dye liquid through the filter box, and then use the cleaning device to clean the impurities on the filter box to ensure the purity of the dye liquid, thereby improving the dyeing effect of the dyeing machine. The dyeing cylinder is provided with a cloth inlet and a cloth turning roller. The cloth is wound around the cloth turning roller through the cloth inlet. When dyeing, the cloth turning roller drives the cloth to rotate together, so that the whole cloth can be evenly sprayed with dye liquid to obtain color, further improving the uniformity of the dyeing machine body.

[0012] Furthermore, the longitudinal circulation device comprises:

[0013] Circulation pump;

[0014] A return pipe connected to a circulation pump;

[0015] A nozzle connected to the return pipe;

[0016] Wherein, the circulation pump is placed at the bottom of the shell.

[0017] In the technical scheme, a circulation pump, a reflux pipe and a nozzle are arranged in the longitudinal circulation device, and the circulation pump is placed at the bottom of the shell, and the nozzle is placed inside the dye vat. When dyeing is performed, the circulation pump is started, and after the circulation pump absorbs the dye liquid, the dye liquid flows along the reflux pipe to the nozzle, and then the dyeing machine body sprays the dye liquid from the nozzle into the dye vat, thereby dyeing the cloth inside the dye vat. Since the cloth and liquid are separated during the dyeing process, less dye liquid is required, so the bath ratio of the dyeing machine body is relatively low, and the dye liquid can be recycled, thereby reducing the production cost. A plurality of longitudinal circulation devices are arranged, and the plurality of circulation pumps are placed at the bottom of the shell. The concentration of the dye liquid absorbed is similar, and at the same time, the nozzles are evenly placed inside the dye vat, which greatly improves the uniformity of dyeing and ensures the quality of the finished product.

[0018] Furthermore, the filtering mechanism comprises:

[0019] A filter plate, which is rotatably connected to the filter box;

[0020] a top cover, including an electromagnet;

[0021] A rubber pad connected to the top cover;

[0022] A permanent magnet connected to the housing;

[0023] Wherein, the filter box is provided with a flow sensor, the flow sensor is connected to the electromagnet, the electromagnet is connected to the permanent magnet after being energized, and the top cover is fixedly connected to the filter plate.

[0024] In the present technical scheme, the filter plate is connected by rotating on the filter box, and the filter plate is fixedly connected to the top cover. An electromagnet is arranged in the top cover, and a permanent magnet is connected to the shell. A rubber pad is connected to the top cover, which can enhance the sealing of the connection between the filter box and the dye vat to reduce the probability of dye splashing out from the connection and ensure a relatively clean working environment. A flow sensor is arranged at the liquid outlet of the filter box. When the flow sensor detects a small flow rate, it indicates that more impurities have accumulated on the filter plate. The flow sensor triggers the electromagnet to be energized. After the electromagnet is energized, it is connected to the permanent magnet. The top cover rotates and drives the filter plate to rotate. At this time, the side of the filter plate with impurities is exposed to the outer surface of the dyeing machine body, so that the cleaning device can clean the filter plate conveniently and the filter plate can work normally.

[0025] Furthermore, the cleaning device comprises:

[0026] Motor, including lead screw;

[0027] A movable bracket cooperates with the screw rod;

[0028] A sliding frame is slidably connected to the movable bracket and is slidably connected to the dyeing tank;

[0029] An electric telescopic rod, a fixed end of which is connected to the housing, and a movable end of which is connected to the sliding frame;

[0030] Cleaning rollers;

[0031] A waste box is plugged into the dye vat;

[0032] Wherein, the cleaning roller is rotatably connected to the movable bracket.

[0033] In the present technical scheme, an electric telescopic rod and a sliding frame are arranged in the cleaning device, the fixed end of the electric telescopic rod is connected to the shell, the movable end is connected to the sliding frame, and the sliding frame is slidably connected to the dye vat. The staff adjusts the length of the electric telescopic rod to move the sliding frame to a position suitable for cleaning. A cleaning roller is rotatably connected to the movable bracket, and a motor with a screw rod is arranged on the sliding frame. The movable bracket cooperates with the screw rod, and the sliding frame and the movable bracket are slidably connected. When cleaning, the motor is started, the motor drives the screw rod to rotate, and the screw rod causes the movable bracket to slide on the sliding frame, so that the cleaning roller can clean the impurities on the filter plate into the waste box plugged between the dye vat, so that the filter plate can resume normal operation, thereby improving the dyeing efficiency.

[0034] Furthermore, the dyeing vat is provided with a supporting column;

[0035] Wherein, the cloth inlet is hinged with a cover.

[0036] In the present technical solution, a support column is arranged at the bottom of the dye vat. When the overflow dyeing machine is working, the ground environment is generally humid. The support column keeps the dye vat away from the ground to prevent the dye vat from being affected by the humid ground and shortening its service life. A cover is provided at the cloth inlet. After the cloth inlet is closed by the cover, the dye liquid in the dye vat can be prevented from splashing out of the cloth inlet, thereby reducing the impact of the dye liquid on the working environment.

[0037] Furthermore, the cloth transfer roller is provided with a wear-resistant layer.

[0038] In the present technical solution, a wear-resistant layer is provided on the cloth transfer roller, which reduces the friction coefficient between the cloth transfer roller and the cloth, and can effectively reduce the probability of the cloth being worn during the dyeing process, and prevent the cloth from having dyeing quality problems such as scratches and wrinkles during the dyeing process. The wear-resistant layer can also extend the service life of the cloth transfer roller, and reduce the maintenance cost of the staff on the dyeing machine body, thereby increasing the production efficiency of the dyeing machine body.

[0039] The beneficial effects of this application are:

[0040] 1. Several longitudinal circulation devices are installed in the dye liquid circulation chamber to spray the dye liquid with relatively uniform concentration at the bottom of the shell evenly into the dye vat, which improves the uniform dyeing. The dye liquid circulation mechanism can recycle the dye liquid, reduce the bath ratio, and is equipped with a filter box to clean the impurities in the dye liquid to ensure the purity of the dye liquid, thereby improving the dyeing effect of the dyeing machine.

[0041] 2. During the dyeing process, the cloth and liquid are separated, and less dye liquid is needed. Therefore, the bath of the dyeing machine body is relatively low, and several circulation pumps are set at the bottom of the shell. The concentration of the dye liquid absorbed is similar, and the nozzles are evenly placed inside the dye tank, so that the dye liquid can be evenly sprayed onto the cloth in the dye tank, which greatly improves the uniformity of dyeing.

[0042] 3. When the flow sensor detects that the flow at the liquid outlet of the filter box is small, it indicates that there are many impurities on the filter plate, which can trigger the electromagnet to energize, so that the side of the filter plate with impurities is placed on the outer surface of the dyeing machine body for easy cleaning. When cleaning, start the motor, the motor drives the screw to rotate, and the screw makes the movable bracket slide on the sliding frame to facilitate the cleaning roller to clean the filter plate, so that the filter plate can work normally, thereby improving the dyeing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a structural schematic diagram of a low bath ratio overflow dyeing machine for this application;

[0044] Figure 2 This is a schematic diagram of the internal structure of a low bath ratio overflow dyeing machine of the present application;

[0045] Figure 3 It is a schematic diagram of the structure of the cleaning device when it is working;

[0046] Figure 4 for Figure 1 A magnified view of point A;

[0047] 100, dyeing machine body; 200, dye liquor circulation mechanism; 210, shell; 211, dye liquor circulation chamber; 220, longitudinal circulation device; 221, circulation pump; 222, reflux pipe; 223, nozzle; 300, filtering mechanism; 310, filter box; 311, flow sensor; 320, cleaning device; 321, motor; 322, movable bracket; 323, sliding rack; 324, electric telescopic rod; 325, cleaning roller; 326, waste box; 327, screw; 330, filter plate; 340, top cover; 341, electromagnet; 350, rubber pad; 360, permanent magnet; 400, dyeing cylinder; 410, cloth inlet; 411, cover; 420, cloth transfer roller; 421, wear-resistant layer; 430, support column. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0049] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0050] The following provides a detailed description of the embodiments of the present application through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0051] Embodiment 1:

[0052] like Figure 1-4 As shown, the embodiment of the present application provides a low bath ratio overflow dyeing machine, including a dyeing machine body 100, and the dyeing machine body 100 includes:

[0053] The dye liquor circulation mechanism 200 comprises a housing 210 and a longitudinal circulation device 220;

[0054] The filter mechanism 300 includes a filter box 310 and a cleaning device 320;

[0055] The dyeing vat 400 includes a cloth inlet 410 and a cloth transfer roller 420;

[0056] The housing 210 is provided with a dye liquid circulation chamber 211 , and a plurality of longitudinal circulation devices 220 are provided, and the longitudinal circulation devices 220 are placed in the dye liquid circulation chamber 211 .

[0057] A dye liquid circulation mechanism 200 with a shell 210 and a longitudinal circulation device 220 is arranged on the dyeing machine body 100, a dye liquid circulation chamber 211 is opened in the shell 210, and a plurality of longitudinal circulation devices 220 are installed in the dye liquid circulation chamber 211, and the liquid outlets of the longitudinal circulation devices 220 are longitudinally distributed in the dye vat 400, and the plurality of longitudinal circulation devices 220 spray the dye liquid at the bottom of the shell 210 into the dye vat 400 uniformly, and the concentration of the dye liquid at the bottom is relatively uniform, so that the cloth in the dye vat 400 can be uniformly dyed, and the uniform dyeing property is improved. The dyeing machine body 100 can repeatedly use the dye liquid through the dye liquid circulation mechanism 200, and the cloth can be dyed with less dye liquid, thereby reducing the bath ratio and reducing the A series of production costs are reduced. The dyeing machine body 100 is also provided with a filter mechanism 300 with a filter box 310 and a cleaning device 320. When the dye liquid needs to be reused, impurities such as flocs on the surface of the cloth will be mixed inside. The staff filters out the impurities in the dye liquid through the filter box 310, and then uses the cleaning device 320 to clean the impurities on the filter box 310 to ensure the purity of the dye liquid, thereby improving the dyeing effect of the dyeing machine. The dyeing vat 400 is provided with a cloth inlet 410 and a cloth turning roller 420. The cloth is wound around the cloth turning roller 420 through the cloth inlet 410. When dyeing, the cloth turning roller 420 drives the cloth to rotate together, so that the entire cloth can be evenly sprayed with dye liquid to obtain color, further improving the uniformity of the dyeing machine body 100.

[0058] Furthermore, the longitudinal circulation device 220 includes:

[0059] Circulation pump 221;

[0060] A reflux pipe 222 connected to the circulation pump 221;

[0061] The nozzle 223 is connected to the return pipe 222;

[0062] The circulation pump 221 is disposed at the bottom of the housing 210 .

[0063] By arranging a circulation pump 221, a return pipe 222 and a nozzle 223 in the longitudinal circulation device 220, and placing the circulation pump 221 at the bottom of the shell 210, and placing the nozzle 223 inside the dye vat 400, when dyeing, start the circulation pump 221, and after the circulation pump 221 absorbs the dye liquid, the dye liquid flows along the return pipe 222 to the nozzle 223, and then the dyeing machine body 100 sprays the dye liquid from the nozzle 223 into the dye vat 400, so as to dye the cloth inside the dye vat 400. Since the cloth and liquid are separated during the dyeing process, less dye liquid is needed, so the bath ratio of the dyeing machine body 100 is relatively low, and the dye liquid can be recycled, thereby reducing the production cost. The longitudinal circulation device 220 is provided with a plurality of circulation pumps 221, and the plurality of circulation pumps 221 are all placed at the bottom of the shell 210, and the concentration of the dye liquid absorbed is similar. At the same time, the nozzle 223 is evenly placed inside the dye vat 400, which greatly improves the uniformity of dyeing and ensures the quality of the finished product.

[0064] Furthermore, the filtering mechanism 300 includes:

[0065] The filter plate 330 is rotatably connected to the filter box 310;

[0066] A top cover 340 including an electromagnet 341;

[0067] A rubber pad 350 connected to the top cover 340;

[0068] A permanent magnet 360 connected to the housing 210;

[0069] The filter box 310 is provided with a flow sensor 311 , which is connected to an electromagnet 341 , which is connected to a permanent magnet 360 after being energized, and a top cover 340 is fixedly connected to the filter plate 330 .

[0070] By rotating the filter plate 330 on the filter box 310, the filter plate 330 is fixedly connected to the top cover 340, an electromagnet 341 is arranged in the top cover 340, and a permanent magnet 360 is connected to the housing 210, and a rubber pad 350 is connected to the top cover 340, which can enhance the sealing of the connection between the filter box 310 and the dye vat 400, so as to reduce the probability of dye splashing out from the connection, and ensure a relatively clean working environment. A flow sensor 311 is arranged at the liquid outlet of the filter box 310. When the flow sensor 311 detects that the flow rate is small, it indicates that more impurities have accumulated on the filter plate 330. The flow sensor 311 triggers the electromagnet 341 to be energized. After the electromagnet 341 is energized, it is connected to the permanent magnet 360. The top cover 340 rotates and drives the filter plate 330 to rotate. At this time, the side of the filter plate 330 with impurities is exposed to the outer surface of the dyeing machine body 100, so that the cleaning device 320 can clean the filter plate 330 conveniently, so that the filter plate 330 can work normally.

[0071] Furthermore, the cleaning device 320 includes:

[0072] The motor 321 includes a screw rod 327;

[0073] The movable bracket 322 cooperates with the screw rod 327;

[0074] The sliding frame 323 is slidably connected with the movable bracket 322 and is slidably connected with the dye vat 400;

[0075] An electric telescopic rod 324, a fixed end of which is connected to the housing 210, and a movable end of which is connected to the sliding frame 323;

[0076] Cleaning roller 325;

[0077] A waste box 326, which is plugged into the dye vat 400;

[0078] The cleaning roller 325 is rotatably connected to the movable bracket 322 .

[0079] By setting an electric telescopic rod 324 and a sliding frame 323 in the cleaning device 320, the fixed end of the electric telescopic rod 324 is connected to the housing 210, the movable end is connected to the sliding frame 323, and the sliding frame 323 is slidably connected to the dye vat 400. The staff adjusts the length of the electric telescopic rod 324 to move the sliding frame 323 to a position suitable for cleaning. A cleaning roller 325 is rotatably connected to the movable bracket 322, and a screw rod 327 is provided on the sliding frame 323. The motor 321, the movable bracket 322 and the screw rod 327 cooperate with each other, and the sliding frame 323 and the movable bracket 322 are slidably connected. When cleaning work is performed, the motor 321 is started, the motor 321 drives the screw rod 327 to rotate, and the screw rod 327 makes the movable bracket 322 slide on the sliding frame 323, so that the cleaning roller 325 can clean the impurities on the filter plate 330 into the waste box 326 inserted between the dye vat 400, so that the filter plate 330 can resume normal operation, thereby improving the dyeing efficiency.

[0080] Embodiment 2:

[0081] like Figure 1-4 As shown, the embodiment of the present application provides a low bath ratio overflow dyeing machine, which, in addition to the technical solutions of the above embodiments, also has the following technical features. The dyeing tank 400 is provided with a support column 430;

[0082] The cloth inlet 410 is hinged with a cover 411 .

[0083] By arranging a support column 430 at the bottom of the dye vat 400, when the overflow dyeing machine is working, the ground environment is generally relatively humid. The support column 430 keeps the dye vat 400 away from the ground to prevent the dye vat 400 from being affected by the humid ground and shortening its service life. A cover 411 is provided at the cloth inlet 410. After the cloth inlet 410 is closed by the cover 411, the dye liquid in the dye vat 400 can be prevented from splashing out from the cloth inlet 410, thereby reducing the impact of the dye liquid on the working environment.

[0084] Furthermore, the cloth transfer roller 420 is provided with a wear-resistant layer 421 .

[0085] By arranging a wear-resistant layer 421 on the cloth transfer roller 420, the wear-resistant layer 421 reduces the friction coefficient between the cloth transfer roller 420 and the cloth, which can effectively reduce the probability of the cloth being worn during the dyeing process, and prevent the cloth from having dyeing quality problems such as scratches and wrinkles during the dyeing process. The wear-resistant layer 421 can also extend the service life of the cloth transfer roller 420, reduce the maintenance cost invested by the staff on the dyeing machine body 100, and thus increase the production efficiency of the dyeing machine body 100.

[0086] It should be noted that, in this article, the term "comprises", "includes" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the method and device in the embodiment of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0087] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A low bath ratio overflow dyeing machine, comprising a dyeing machine body (100), characterized in that: The dyeing machine body (100) comprises: The dye liquor circulation mechanism (200) comprises a housing (210) and a longitudinal circulation device (220); A filtering mechanism (300) comprises a filtering box (310) and a cleaning device (320); The dyeing vat (400) comprises a cloth inlet (410) and a cloth transfer roller (420); The housing (210) is provided with a dye liquid circulation chamber (211), and a plurality of longitudinal circulation devices (220) are provided, and the longitudinal circulation devices (220) are placed in the dye liquid circulation chamber (211).

2. A low bath ratio overflow dyeing machine according to claim 1, characterized in that: The longitudinal circulation device (220) comprises: Circulation pump (221); A reflux pipe (222) connected to the circulation pump (221); A nozzle (223) connected to the return pipe (222); Wherein, the circulation pump (221) is placed at the bottom of the housing (210).

3. A low bath ratio overflow dyeing machine according to claim 2, characterized in that: The filtering mechanism (300) comprises: A filter plate (330) rotatably connected to the filter box (310); A top cover (340) including an electromagnet (341); A rubber pad (350) connected to the top cover (340); A permanent magnet (360) connected to the housing (210); The filter box (310) is provided with a flow sensor (311), the flow sensor (311) is connected to the electromagnet (341), the electromagnet (341) is connected to the permanent magnet (360) after being energized, and the top cover (340) is fixedly connected to the filter plate (330).

4. A low bath ratio overflow dyeing machine according to claim 3, characterized in that: The cleaning device (320) comprises: A motor (321) comprising a screw rod (327); A movable bracket (322) cooperates with the screw rod (327); A sliding frame (323) is slidably connected to the movable support (322) and is slidably connected to the dye vat (400); An electric telescopic rod (324), a fixed end of which is connected to the housing (210), and a movable end of which is connected to the sliding frame (323); Cleaning roller (325); A waste box (326) is plugged into the dye vat (400); Wherein, the cleaning roller (325) is rotatably connected to the movable bracket (322).

5. A low bath ratio overflow dyeing machine according to claim 4, characterized in that: The dye vat (400) is provided with a support column (430); Wherein, the cloth inlet (410) is hingedly connected with a sealing cover (411).

6. A low bath ratio overflow dyeing machine according to claim 5, characterized in that: The cloth transfer roller (420) is provided with a wear-resistant layer (421).

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