Doffer cleaning structure of carding machine and carding machine

Abstract

The utility model provides a doffer cleaning structure of a carding machine, which comprises a doffer, and a doffer lower cover plate for supporting a cotton web is arranged at an inlet of the doffer; a defect removing channel is arranged between the doffer lower cover plate and the doffer outlet, and defects on the surface of the doffer are centrifugally removed and enter the defect removing channel; and the guide-out device is arranged at the discharge end of the defect removing channel and is used for collecting and guiding out defects. And the doffer lower cover plate is arranged at the doffer inlet of the doffer to support the fallen cotton web, so that the safety is ensured. The doffer lower cover plate and the doffer outlet pass through the defect removing channel, so that an open structure is formed between the discharging end of the doffer lower cover plate and the doffer outlet, defects on the doffer can be directly thrown out along with rotation of the doffer, and the guiding device is arranged in the defect throwing-out direction of the doffer to collect and guide out the thrown-out defects. The accumulation of thrown defects is effectively avoided, manual cleaning is not needed, the manual working difficulty is reduced, and the working safety of the doffer is improved. The utility model further provides the carding machine.

Description

Technical Field

[0001] The utility model relates to the technical field of cleaning and carding in the spinning industry, and more particularly to a doffer cleaning structure of a carding machine and the carding machine. Background Art

[0002] The carding machine is used to open, comb and remove impurities from the cotton (chemical fiber) rolls sent from the previous process or the oily cotton (chemical fiber) layer supplied by the cotton box, so that all the curled cotton loops become basically straight single fibers. In the process, the broken seeds, impurities and short fibers left over from the cotton cleaning process are removed, and then the cotton strips of a certain specification are integrated and stored in the cotton tube for use in the drawing process.

[0003] like Figure 1 As shown, Figure 1 It is a structural diagram of a cotton carding machine in the prior art. The cotton carding machine consists of a cotton feeding box component, a cotton feeding roller component 1', a licker-in component, a cylinder 2', a movable cover component 3', a doffer component 4', a cotton stripping roller component 5', a coiler, etc. During operation, the cotton bundle 6' is transported to the cotton feeding box through a pipeline. The cotton feeding box outputs continuous, uniform, and relatively stable matting cotton into the cotton feeding roller component 1' of the cotton carding machine. The matting cotton layer is then decomposed into small cotton bundles by the high-speed rotating licker-in cylinder 2'. In the process of decomposition, defects (impurities, seed crumbs, leaves, cottonseed shells, ropes, etc.) in the cotton bundles are removed. When the decomposed cotton bundle 6' moves to the nearest point of the licker-in cylinder 2', the cotton bundle 6' is grabbed and transferred by the cylinder needle cloth with higher speed and denser needle punching. After the cotton bundle 6' enters the working area of the cylinder 2', it enters In one step, it is combed into single fibers, and most of the defects (short fibers, impurities, dust, and cotton knots) are caught and removed by the movable cover plate 3'. After passing the minimum spacing point with the doffer 4', the fibers on the surface of the cylinder 2' are stripped by the doffer needle cloth, and condensed into a cotton web (or fiber web) on the surface of the doffer needle cloth. It is transferred under the support of the doffer cover plate 7', and then the cotton web is stripped by the cotton stripping roller component 5', output through the crushing roller and aggregated into raw strips (or cotton strips), and regularly placed in the coiling cylinder through the coiler to complete the cotton combing production process.

[0004] A doffer cover plate 7' is installed under the doffer 4' to solve the quality and safety problems that occur during the production process of the carding machine. There are multiple doffer cover plates 7' installed under the doffer 4', one pressing the other along the working rotation direction of the doffer 4'. Figure 2 As shown, Figure 2 for Figure 1Schematic diagram of the doffer structure of a carding machine. The apron 7-5 is installed at the doffer outlet position, and the apron 7-5 presses on the apron 7-4, the apron 7-4 presses on the apron 7-3, the apron 7-3 presses on the apron 7-2, the apron 7-2 presses on the apron 7-1, and the apron 7-1 is installed at the doffer inlet position. There is a gap of about 6 mm between the five doffer aprons 7` and the surface of the doffer needle teeth 4-1. The doffer aprons 7` form a continuous sealing body below the surface of the doffer card clothing.

[0005] In the existing product structure, during actual production, the doffer rotates clockwise. After the doffer 3 grabs the cotton web, the fine impurities and short fibers in the cotton web collide and accumulate with the inner surface of the doffer apron under the action of the doffer centrifugal force; part of the cotton web falls onto the doffer apron and rubs against the doffer apron. These factors will cause the inner surface of the doffer apron to become rough and sticky after being used in production for a period of time. If it is not removed and cleaned in time, it will cause the carding machine to run unstably, the weight fluctuation of the sliver to become larger, and the Uster evenness CV value of the sliver to exceed the standard. Therefore, it is necessary to check the inner surface of the doffer apron irregularly. However, regularly removing the lower doffer apron for cleaning requires a large amount of work. Especially in large-scale enterprises, when there are fifty or sixty, or even seventy or eighty carding machines in a workshop, it is very difficult to regularly remove and check the cleaning of the doffer aprons of the carding machines, resulting in a large labor intensity for workers. At the same time, irregular inspection and cleaning affect the output of the carding machine and the quality of the sliver.

[0006] On the other hand, for the installed doffer apron, the doffer apron, the two doffer side walls and the lower surface of the doffer form a relatively sealed cavity. During operation, the boundary layer air flow driven by the rotation of the doffer will form local and multi-point high-pressure areas in this narrow cavity. The unstable pressure in the narrow cavity causes the air flow to move from the high-pressure area to the low-pressure area. During the movement of the air flow, it will inevitably drive the fibers on the surface of the doffer needle teeth, making the cotton web on the surface of the doffer uneven in thickness (or generating new neps), thus bringing about the problem of the boundary layer air flow of the rotating doffer and resulting in quality problems of the cotton web on the doffer surface.

[0007] Therefore, how to improve the product quality stability of the carding machine during the cotton web production process is an urgent problem to be solved by those skilled in the art at present. Utility Model Content

[0008] In view of this, the present utility model provides a doffer cleaning structure and a carding machine for a carding machine to improve the product quality stability of the carding machine during the cotton web production process.

[0009] In order to achieve the above object, the present utility model provides the following technical solutions:

[0010] A doffer cleaning structure for a carding machine, including a doffer, and a lower doffer apron for holding the cotton web is provided at the doffer inlet;

[0011] A defect removal channel is provided between the doffer lower housing plate and the doffer outlet, and defects on the surface of the doffer are centrifugally discharged into the defect removal channel;

[0012] It further includes a discharging device disposed at the discharging end of the defect removal channel for collecting and discharging the defects.

[0013] Preferably, in the doffer cleaning structure of the above carding machine, the discharging device includes a conveyor belt for receiving the defects and a suction duct disposed at the rear end of the conveyor belt for conveying;

[0014] The conveyor belt is a curtain-shaped conveyor belt with a width not less than that of the defect removal channel, and the suction duct has a suction port corresponding to the width direction of the conveyor belt.

[0015] Preferably, in the doffer cleaning structure of the above carding machine, the doffer is an open structure from the discharging end of the doffer lower housing plate to the doffer outlet, and the doffer feeds the defects into the defect removal channel through the open structure.

[0016] Preferably, in the doffer cleaning structure of the above carding machine, the doffer lower housing plate includes a set disposed at the doffer inlet position.

[0017] Preferably, in the doffer cleaning structure of the above carding machine, the doffer is rotatably arranged in the horizontal direction, and the discharging device is arranged below the doffer.

[0018] Preferably, in the doffer cleaning structure of the above carding machine, the discharging device includes the curtain-shaped conveyor belt disposed below the doffer, a baffle extending from the front end of the curtain-shaped conveyor belt to the end of the doffer lower housing plate, and the suction duct is disposed at the rear end of the curtain-shaped conveyor belt for conveying.

[0019] Preferably, in the doffer cleaning structure of the above carding machine, the suction duct has a suction port opened on one side in the radial direction of the duct, and the rear end of the curtain-shaped conveyor belt extends into the suction port; one end in the axial direction of the suction duct is connected to a main suction pipeline.

[0020] Preferably, in the doffer cleaning structure of the above carding machine, a suction gap of 4-9 mm is provided between the suction port and the surface of the curtain-shaped conveyor belt.

[0021] Preferably, in the doffer cleaning structure of the above carding machine, the suction gap is 5 mm, and the average negative pressure of the suction duct is -250 Pa to -350 Pa.

[0022] A carding machine, comprising a frame, a cylinder and a doffer disposed within the frame for conveying a cotton web, and a doffer cleaning structure of the carding machine as described in any one of the above, mounted on the frame below the doffer.

[0023] The doffer cleaning structure of the carding machine provided by the present utility model includes a doffer, and a lower doffer cover plate for holding the cotton web is provided at the doffer inlet; a defect removal channel is provided between the lower doffer cover plate and the doffer outlet, and defects on the surface of the doffer are centrifugally removed and enter the defect removal channel; an export device for collecting and exporting the defects is further provided at the discharge end of the defect removal channel. When a lower doffer cover plate is provided at the doffer inlet of the doffer, when the carding machine has high production or processes poor raw materials, the falling cotton web can be held by the lower doffer cover plate at the doffer inlet, ensuring safety. At the same time, a defect removal channel is provided between the lower doffer cover plate and the doffer outlet, so that the lower doffer cover plate only covers a part of the doffer inlet, and only the part of the doffer inlet is surrounded between the surface of the doffer, the lower doffer cover plate and the doffer wallboards on both sides of the doffer, avoiding the formation of a narrow sealed cavity between the doffer inlet and the doffer outlet, avoiding the formation of local and multi-point high pressures of air flow between the doffer and the lower doffer cover plate, ensuring the air flow stability between the lower doffer cover plate and the doffer, and further improving the thickness uniformity of the cotton web on the surface of the doffer needle teeth.

[0024] Furthermore, the lower doffer cover plate and the doffer outlet are connected by a defect removal channel, so that the lower doffer cover plate forms an open structure between its discharge end and the doffer outlet. Defects on the doffer can be directly thrown out as the doffer rotates. An export device is provided in the direction of the thrown-out defects of the doffer to collect and export the thrown-out defects, effectively avoiding the accumulation of the thrown-out defects, eliminating the need for manual cleaning, reducing the difficulty of manual work, and improving the working safety of the doffer. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0026] Figure 1 It is a schematic structural diagram of a carding machine in the prior art;

[0027] Figure 2 is Figure 1 a schematic structural diagram of the doffer of the carding machine in

[0028] Figure 3 a schematic structural diagram of the doffer cleaning structure of the carding machine provided by the present utility model. Detailed Embodiments

[0029] The utility model discloses a doffer cleaning structure of a carding machine and the carding machine, which improves the product quality stability of the carding machine during the cotton web production process.

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] like Figure 3 As shown, Figure 3 This is a schematic diagram of the doffer cleaning structure of the carding machine provided by the utility model.

[0032] The present embodiment provides a doffer cleaning structure for a cotton carding machine, comprising a doffer 1, wherein the doffer inlet 5 is provided with a doffer lower cover plate 1-1 for supporting the cotton web; a defect removal channel is provided between the doffer lower cover plate 1-1 and the doffer outlet, and defects on the surface of the doffer 1 are centrifugally removed and enter the defect removal channel 1-2; and an export device is also provided at the discharge end of the defect removal channel 1-2 for collecting and exporting defects.

[0033] The doffer entrance of the doffer 1 is provided with a doffer lower cover plate 1-1. When the carding machine is in high production or processes poor raw materials, the doffer lower cover plate 1-1 at the doffer entrance can support the fallen cotton web, thus ensuring safety. At the same time, considering the continuous working state of the carding machine during the production process, the daily operation time can be as long as more than 20 hours. By installing the doffer lower cover plate 1-1, when the doffer of the carding machine drops the cotton web, the cotton web falls on the doffer lower cover plate 1-1. The operator can find and clean it in time, thus preventing the cotton web from accumulating more and more on the carding machine frame bottom plate 4 below the doffer 1, and preventing the cotton web from piling up to form large cotton web bundles. This effectively prevents the accumulated cotton web bundles from being caught by the doffer needle teeth 3, affecting the quality of the carding machine sliver, and preventing the large cotton web from re-entering the cylinder-doffer distance minimum point as the doffer 1 rotates, thus avoiding the cylinder (or doffer) card clothing from being squeezed and even causing the machine to collapse.

[0034] At the same time, a defect removal channel 1-2 is set between the doffer lower cover plate 1-1 and the doffer outlet, so that the doffer lower cover plate 1-1 only covers the part close to the doffer inlet 5, and the surface of the doffer 1 and the doffer lower cover plate 1-1 and the doffer wall panels on both sides of the doffer 1 are only surrounded by the part close to the doffer inlet 5, thereby avoiding the formation of a narrow sealed cavity between the doffer inlet 5 and the doffer outlet, avoiding the formation of local and multi-point high pressure of the airflow between the doffer 1 and the doffer lower cover plate 1-1, ensuring the stability of the airflow between the doffer lower cover plate 1-1 and the doffer 1, and thereby improving the thickness uniformity of the cotton web on the surface of the doffer needle teeth.

[0035] Furthermore, the doffer bottom apron 1-1 and the doffer outlet are connected through a defect removal channel 1-2, so that the doffer bottom apron 1-1 forms an open structure between its discharge end and the doffer outlet. A small amount of web, short fibers, impurities, dust and other defects on the doffer 1 can be directly thrown out as the doffer rotates. A guiding device is arranged in the direction where the defects on the doffer 1 are thrown out to collect and guide the thrown-out defects, effectively avoiding the accumulation of the thrown-out defects, eliminating the need for manual cleaning, reducing the difficulty of manual work, and improving the working safety of the doffer.

[0036] In a specific embodiment of this case, the guiding device includes a conveyor belt 7 for receiving defects and a suction duct 10 arranged at the rear end of the conveyor belt 7 during transmission; the conveyor belt 7 is a curtain-shaped conveyor belt with a width not less than the width of the defect removal channel, and the suction duct 10 has a suction port corresponding to the width direction of the conveyor belt 7. The doffer 1 is a drum structure with a horizontal axis direction, and the doffer 1 is close to the frame below. The defect removal channel is arranged inside the frame and below the doffer 1. To adapt to the certain width of the doffer 1 in the cylindrical structure, the guiding device is provided with a conveyor belt 7 with a curtain-shaped structure, and the surface of the conveyor belt receives the defects thrown out by the doffer.

[0037] Preferably in this embodiment, the conveyor belt 7 is a curtain-shaped conveyor belt 7 with a flat curtain structure, and the width of the curtain-shaped conveyor belt 7 is not less than the axial length of the doffer 1 to receive all the defects thrown out by the doffer 1. The conveyor belt 7 is used to continuously convey the collected defects. A suction duct 10 is arranged at the rear end of the conveyor belt 7, and the suction duct 10 has a suction port corresponding to the width of the conveyor belt 7, so that all the defects received in the width direction of the conveyor belt 7 can be sucked out, preventing the adhesion and accumulation of defects on the surface of the continuously conveyed conveyor belt, and completing the cleaning of the defects under the doffer. The surface of the conveyor belt 7 is a flat structure and has a width corresponding to the axial length of the doffer 1, making it a flat curtain structure as a whole and having an effective function of receiving defects.

[0038] In a specific embodiment of this case, the doffer 1 has an open structure from the discharge end of the doffer bottom apron 1-1 to the doffer outlet, and the doffer 1 sends the defects into the defect removal channel through this open structure. It can be understood that by arranging the doffer bottom apron 1-1 at the doffer inlet 5 position, the function of supporting the web conveyed by the doffer 1 can be realized. Preferably in this embodiment, the doffer bottom apron 1-1 includes a group arranged at the doffer inlet position, that is, one doffer bottom apron is provided and located close to the doffer inlet 5 position.

[0039] An open structure is set between the doffer lower apron 1-1 and the doffer outlet, and no doffer lower apron is arranged anymore. Then, the doffer 1 between the discharge end of the doffer lower apron 1-1 and the doffer outlet is of an open structure. After the doffer 1 rotates out from under the doffer lower apron 1-1, an inlet of a defect removing channel 1-2 for flinging defects can be formed between the doffer lower apron 1-1 and the doffer outlet, enabling the doffer 1 to obtain a longer defect flinging length and improving the defect flinging ability.

[0040] In a specific embodiment of this case, the doffer 1 is rotationally arranged in the horizontal direction, and the discharging device is arranged below the doffer.

[0041] Furthermore, the discharging device includes a curtain-shaped conveyor belt 7 arranged below the doffer 1, a baffle 9 extending from the front end of the conveyor of the curtain-shaped conveyor belt 7 to the end of the doffer lower apron 1-1, and an air suction duct 10 arranged at the conveyor end of the curtain-shaped conveyor belt 7.

[0042] A doffer lower apron 1-1 is installed at the doffer inlet 5 position, and no doffer lower apron is set between this doffer lower apron 1-1 and the doffer outlet, making the lower surface of the doffer 1 completely exposed. The discharging device arranged below the doffer realizes the self-cleaning function. The discharging device is composed of a driving roller 6, a curtain-shaped transmission belt 7, a driven roller 8, a baffle 9, an air suction duct 10, etc. The width direction of the curtain-shaped transmission belt 7 is basically the same as that of the carding machine doffer 1. In a preferred structure, the width length of the curtain-shaped transmission belt is 600 mm, and the surface of the flat curtain transmission belt 7 of the discharging device is about 15 mm away from the bottom plate of the carding machine frame. Both ends of the driving roller 6 and the driven roller 8 are fixed on the floor 4 of the carding machine frame through bearing seats.

[0043] When the carding machine is working, after the carding machine doffer starts to move, the discharging device receives a control signal and drives the driving roller 6 to start rotating, driving the curtain-shaped conveyor belt 7 to move slowly. The doffer 1 rotates at a high speed, and the defects (a little cotton web, short fibers, impurities, dust, etc.) on the surface of the doffer fall off under the action of rotational centrifugal force and drop onto the curtain-shaped conveyor belt 7, and move slowly towards the conveyor rear end along with the curtain-shaped conveyor belt 7.

[0044] For the convenience of arrangement, the curtain-shaped conveyor belt 7 is fixedly installed on the frame bottom plate 4 in a flat curtain structure. Considering the uncertainty of the direction of the defects flung from the doffer 1, a baffle 9 is set to block the defects discharged from the discharge end of the doffer lower apron 1-1 so that the defects fall on the curtain-shaped conveyor belt. At the conveyor end of the curtain-shaped conveyor belt 7, due to the setting of the air suction duct 10, it provides a negative pressure for adsorbing the defects on the curtain-shaped conveyor belt 7, thereby enabling negative pressure adsorption of the defects near the doffer outlet position and restricting the defects in the area between the baffle 9 and the air suction duct 10, realizing the effective collection of the defects.

[0045] In a specific embodiment of this case, the suction duct 10 has a suction port opened on one side in the radial direction of the duct, and the conveying end of the curtain-shaped conveyor belt 7 extends into the suction port; one end in the axial direction of the suction duct 10 is connected to a main suction pipeline.

[0046] Further, a suction gap of 4-9 mm is provided between the suction port and the surface of the curtain-shaped conveyor belt 7. Preferably, the suction gap is 5 mm, and the average negative pressure in the suction duct 10 is -250 Pa to -350 Pa.

[0047] The suction duct 10 is arranged in a small surrounding state at the driving roller 6 from its suction port. There is a 4-9 mm gap between the upper and lower openings of the suction port and the curtain-shaped conveyor belt 7. Preferably, the suction gap is 5 mm. A suction main pipeline is arranged on one side of the suction duct 10. The suction main pipeline is a hose structure and is connected to the main falling cotton pipeline of the carding machine. The average negative pressure in the suction duct 10 is -250 Pa to -350 Pa (the filter dust negative pressure is affected by the total filter dust negative pressure of the carding machine). When the falling defects move to this position along with the curtain-shaped conveyor belt 7, under the action of the filter dust negative pressure in the suction duct 10, they enter the filter dust unit through the main filter dust pipeline of the carding machine, completing the self-cleaning function.

[0048] By providing a discharging device below the doffer 1 and combining the discharging device with the doffer lower cover plate 1-1 located on the 5th side of the doffer inlet, the working safety of the carding machine can be effectively improved.

[0049] 1. Release space and stabilize the air flow to keep the cotton web state on the doffer card clothing surface of the carding machine stable. Only one doffer cover plate 1-1 at the doffer inlet position of the carding machine is retained, and the remaining doffer lower cover plates are removed. The boundary layer air flow generated during the rotation of the doffer is fully released and will not affect the cotton web on the doffer surface due to the boundary layer air flow.

[0050] 2. Solve the problem of regular cleaning and maintenance of the inner surface of the doffer lower cover plate and reduce the labor intensity of workers. During use, the inner surfaces of the 2-3 lowest cover plates of the carding machine doffer are the most likely to get dirty. When the carding machine doffer is installed with lower cover plates and processes cotton or polyester fibers, it is necessary to disassemble the doffer lower cover plates for cleaning once every 1 month to 1.5 months on average. If the raw materials are of poor quality, the cleaning cycle may be shorter. By using the discharging device of this application and only installing one doffer lower cover plate 1-1 at the doffer inlet position, the maintenance work of disassembling and cleaning once a year can be achieved, greatly reducing the labor intensity.

[0051] 3. Increase the probability of removing defects such as fine impurities, short lint, and dust, and improve the quality of the card sliver. The cotton web transferred to the surface of the doffer has been fully carded, and the degree of single fiberization is very high. Some defects that have not been removed in time are also transferred to the doffer clothing. These defects are relatively easy to remove under the action of centrifugal force. After the lower end of the doffer 1 is arranged in an open structure opposite to the discharging device, under the action of the centrifugal force of the doffer rotation, a part of the defects can be removed, improving the quality of the card sliver.

[0052] 4. Safety function, solve the safety hazard of the card caused by the accumulation of the dropped web on the doffer 1. After only one doffer cover plate is set on the card, during continuous production, due to various reasons, there may be a phenomenon of a small amount of web dropping on the doffer. Over time, and considering the fluffiness of the dropped cotton web, it is very easy to accumulate into a mass at the bottom plate position below the doffer 1. When these fibers accumulate on the surface of the needle teeth below the doffer and are caught by the doffer clothing, it may cause relatively serious consequences. By setting the doffer lower cover plate at the doffer inlet 5 and the doffer structure combined with the discharging device, the situation of fiber accumulation will not occur, solving the safety hazard of removing the doffer cover plate of the card.

[0053] Based on the doffer cleaning structure of the card provided in the above embodiments, the present utility model also provides a card, including a frame, a cylinder and a doffer arranged in the frame for cotton web conveying, and the doffer cleaning structure of the card provided in the above embodiments is installed on the frame below the doffer.

[0054] Since the card adopts the doffer cleaning structure of the card in the above embodiments, the beneficial effects brought by the doffer cleaning structure of the card to this card can refer to the above embodiments.

[0055] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to these embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A doffer cleaning structure of a carding machine, characterized in that It includes a doffer, wherein the doffer entrance is provided with a doffer lower cover plate for supporting the cotton net; A defect removal channel is provided between the doffer lower cover plate and the doffer outlet, and defects on the doffer surface are centrifugally removed and enter the defect removal channel; It also includes an outlet device arranged at the outlet end of the defect removal channel for collecting and outleting the defects.

2. The doffer cleaning structure of the carding machine according to claim 1, wherein, The guide device includes a conveyor belt for receiving the defects and an air suction duct provided at the rear end of the conveyor belt; The conveyor belt is a curtain-shaped conveyor belt whose width direction is not less than the width of the defect removal channel, and the suction duct has a suction port corresponding to the width direction of the conveyor belt.

3. The doffer cleaning structure of the carding machine according to claim 2, characterized in that, The doffer is an open structure from the discharge end of the doffer lower cover plate to the doffer outlet, and the doffer sends the defects into the defect removal channel through the open structure.

4. The doffer cleaning structure of the carding machine according to claim 3, characterized in that, The doffer lower cover plate includes a group arranged at the doffer entrance position.

5. The doffer cleaning structure of the carding machine according to claim 3, characterized in that, The doffer is arranged to rotate in the horizontal direction, and the lead-out device is arranged below the doffer.

6. The doffer cleaning structure of the carding machine according to claim 5, characterized in that, The derivation device includes the curtain-like conveyor belt arranged below the doffer, a baffle extending from the conveying front end of the curtain-like conveyor belt to the end of the doffer lower cover plate, and the suction duct is arranged at the conveying end of the curtain-like conveyor belt.

7. The doffer cleaning structure of the carding machine according to claim 6, wherein The suction duct has a suction port opened on one radial side of the duct, and the conveying end of the curtain-shaped conveyor belt extends into the suction port; one axial end of the suction duct is connected to the main suction line.

8. The doffer cleaning structure of the carding machine according to claim 7, characterized in that, A suction gap of 4 to 9 mm is provided between the suction port and the surface of the curtain-shaped conveyor belt.

9. The doffer cleaning structure of the carding machine according to claim 8, characterized in that, The air suction gap is 5 mm, and the average negative pressure of the air suction duct is between -250 Pa and -350 Pa.

10. A carding machine, comprising a frame, a cylinder and a doffer arranged in the frame for conveying a cotton web, characterized in that, A doffer cleaning structure for a carding machine according to any one of claims 1 to 9 is provided below the doffer and is mounted on the frame.

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