Sawtooth-shaped card clothing for roller type or cover plate type carding machine
By designing the corrugated concave structure of the serrated needle cloth, the fiber transportation in the roller or cover carding machine is optimized, and the problem of poor fiber transfer is solved and more efficient fiber transfer and adhesion is achieved.
Patent Information
- Application Number
- CN202480005037.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-09-25
- Filing Date
- 2024-02-08
- Publication Date
- 2025-07-08
AI Technical Summary
In the prior art, the transfer between the fibers between Xilin and Doff in the roller type or cover type carding machine is not ideal, and the fibers are retained at the tooth abdomen, resulting in poor fiber transportation and difficult to be effectively grasped by subsequent roller needle cloth.
A serrated needle cloth is designed, each tooth has multiple corrugated recesses, which increase with the distance. By connecting with a specific radius, the transport of fibers from the bottom of the teeth to the tip is optimized, and the adhesion of the fibers at the tip is enhanced.
The transfer coefficient between Xilin and Dorph is improved, the fiber adhesion at the tooth tips is improved, fiber damage is reduced, and fiber transportation efficiency is enhanced.
Smart Images
Figure CN120283089A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a sawtooth card clothing for a roller carding machine or a flat carding machine according to the preamble of claim 1, having a tooth root and a plurality of teeth arranged in sequence and protruding above the tooth root, wherein each tooth has a tooth flank, a tooth tip and a tooth back, and each tooth back transitions to the tooth flank of the next tooth through a rounded tooth base. Background Art
[0002] EP 2756119 B1 discloses a card clothing for a pressure roller on a roller carding machine or a doffer on a flat carding machine, which has at least one recess in the tooth flank. The disadvantage of this card clothing is that more fibers remain in the recesses in the tooth flank, resulting in unsatisfactory transfer of fibers between the cylinder and the doffer or between the cylinder and the worker roller. Summary of the Invention
[0003] The object of the present invention is to improve the transfer coefficient between the cylinder and the doffer on a flat carding machine or between the cylinder and the worker roller or the reversing roller on a roller carding machine. In particular, the guiding or transportation of fibers from the tooth base to the tooth tip should be optimized so that the fibers can be more easily grasped by the subsequent roller card clothing. At the same time, the adhesion of fibers at the tooth tip should be enhanced.
[0004] This object is solved starting from the sawtooth card clothing according to the preamble of claim 1 and the characterizing part. Advantageous improvements of the present invention are given in the dependent claims.
[0005] The sawtooth card clothing for a flat or roller carding machine has a tooth root and a plurality of teeth arranged in sequence and protruding above the tooth root. Each tooth has a tooth flank, a tooth tip and a tooth back, and each tooth back transitions to the tooth flank of the next tooth through a rounded tooth base.
[0006] It is provided according to the present invention that each tooth has at least two, preferably at least three, wavy recesses (valleys) in its tooth flank, which increase as the distance from the tooth tip increases, wherein these recesses are all formed by a first radius, and at least two of the first radii are directly or indirectly connected by a corresponding other second radius (peak). The tooth flank preferably can have two to five recesses. The recesses are configured as concave openings in the tooth flank, the contour of which is formed by a constant first radius. These concave openings or recesses are directly or indirectly connected by a raised second radius so that the fibers can be transported slidably towards the tooth tip.
[0007] Here, the first recess in the tip region has a distance (X1) from the flank, and with increasing distance from the tip, the distance (X2, X3) of each additional recess from the flank is at least 40% greater than that of the previous recess. The recesses or troughs increase towards the root of the tooth and accumulate more fibers there. Or conversely, since the distance of the recesses towards the tip from the flank decreases successively, these recesses can be filled with fibers more quickly, which increases the pressure for transporting the fibers towards the tip. In the prior art, it is stipulated that the recesses maintain a constant distance from the flank, resulting in an unchanged amount of fibers in the recesses. The fiber transport is achieved only by the geometry of the recesses rather than their dimensions gradually decreasing towards the tip.
[0008] Preferably, the first radius of the concave mouth forming the recess is at most 0.16 mm, preferably at most 0.15 mm, and particularly preferably at most 0.12 mm. Thus, the concave mouth (trough) of the recess has a greater curvature than known in the prior art. The greater curvature can also enhance the transport of fibers towards the tip, and the curvature does not terminate with a zero radius or at the edge.
[0009] Advantageously, the second radius (crest) connecting the recesses (troughs) is at most the size of the first radius of the recess. The fibers slide uniformly towards the tip during the direction reversal (vertical - horizontal - vertical).
[0010] Between the first radius of the recess (trough) and the connecting second radius (crest), horizontal and vertical sections can be arranged, and these sections increase with increasing distance from the tip. Thereby, it is possible to achieve a recess or concave mouth that gradually increases towards the root while maintaining the radius constant. At the same time, these sections can additionally assist in fiber transport. These sections can be constructed in a straight line or as a curve.
[0011] For this purpose, the horizontal sections can be inclined at an angle relative to the horizontal line towards the tip respectively, so that the fibers are continuously transported from the concave mouth or the recess to the flank in order to transfer to the next recess.
[0012] The same applies to the vertical connecting sections, which are preferably inclined at an angle relative to the vertical line towards the inside of the recess respectively, so that the fibers are pushed from the crest (i.e., the second radius of the protrusion at the flank) into the next recess at a higher position.
[0013] The flank can have a flank angle of 35° to 45° relative to the vertical line, preferably 40°, which enables the sawtooth card clothing to function more strongly in the case of cotton and fiber mixtures.
[0014] The flank angle at the tip can have an angle of 45° to 55° relative to the vertical line, preferably 50°, wherein a continuous transition to the extended flank is achieved through the radius (r). Due to the additional inclination of the tip in the flank thus brought about, the fibers are held on the outermost periphery of the card clothing wound around the roller before transfer.
[0015] Preferably, the back of the tooth may have a first straight or convex section that transitions to a second convex section at the tooth tip. The more inclined second convex section of the back of the tooth, combined with a stronger flank angle at the tooth tip, enables efficient fiber processing and high durability without compromising the stability of the tooth.
[0016] Preferably, the straight or convex first section of the back of the tooth has an angle of 50° to 70° relative to the vertical line.
[0017] Surprisingly, it has been confirmed that fiber damage can be reduced when the tooth width (upper profile thickness) at the tooth tip is in a certain proportion to the size of the first recess. For example, this applies when the average fiber length is between 30 mm and 60 mm (such as cotton or PET / CV mixture). Here, the depth of the first recess associated with the tooth tip is at least one quarter of the upper profile thickness Y. Tests have shown that at this ratio, fiber damage during fiber transfer to the card clothing of the subsequent roller is minimized.
[0018] The sawtooth card clothing is preferably used on the working roller or the deflecting roller of a roller carding machine, or on the doffer of a flat carding machine.
[0019] With the sawtooth card clothing of the present invention, the transfer coefficient between the cylinder and the doffer on a flat carding machine is increased. When used between the cylinder and the working roller or the deflecting roller on a roller carding machine, the attachment of fibers at the tooth tip is improved. The size of the recess (valley) gradually decreases from the tooth base to the tooth tip, increasing the pressure acting on the fiber volume, thereby forcing the fibers to be transported to the tooth tip. Description of the Drawings
[0020] Other measures for improving the present invention are described in more detail below with reference to the drawings in connection with a preferred embodiment of the present invention.
[0021] In the drawings:
[0022] Figure 1a - Figure 1b A schematic diagram showing the card clothing according to the present invention in a side view and a sectional view;
[0023] Figure 2a - Figure 2c An enlarged view showing the geometry of a single tooth. Detailed Description of the Invention
[0024] Figure 1a and 1bShows a section of the card clothing 1, which has a tooth root 2 and three teeth 3 shown here. The card clothing can have a length of several hundred meters in the manufacturing process. The tooth root has a width B and a height H1. On the first side 8 of the card clothing 1, the tooth root 2 transitions to the tooth 3 without interruption or steps and forms a vertical surface there. On the opposite second side 9, the tooth root 2 transitions to the tooth 3 through a first inclined step and a radius, and the tooth tapers towards the tooth tip 7. A free space for the fibers to be processed is formed between adjacent teeth 3 of the card clothing 1 wound around the roller.
[0025] Each tooth 3 has a tooth back 4, a tooth tip 7 and a tooth flank 5, where the tooth flank 5 transitions to the tooth back 4 of the front - arranged tooth 3 through a tooth base 6. Here, the tooth base 6 transitions from the tooth back 4 to the subsequent tooth flank 5 with a radius R. The tooth back has a first section 4.1, which forms a straight or slightly convex profile starting from the tooth base 6. The first section 4.1 of the tooth back is connected to the second section 4.2 of the tooth back, which ends in a convex shape at the tooth tip 7. The tooth back 4 can be arranged or inclined at an angle ε of, for example, 50° to 70° relative to the vertical line.
[0026] The angle α of the tooth flank 5 relative to the vertical line is 35° to 45°, preferably 40°.
[0027] The teeth have a distance L at the tooth tip 7, which can be between 2 mm and 4 mm. The tooth root 2 can have a height H1 of 0.7 mm to 1.5 mm. The height H of the card clothing 1 can be between 2.5 mm and 5 mm. At the tooth tip 7, the card clothing 1 can have a width Y of at least 0.25 mm.
[0028] When the average fiber length is between 30 mm and 60 mm (such as cotton or PET / CV mixture), surprisingly, a relationship is obtained between the width Y (upper profile thickness) of the card clothing at the tooth tip 7 and the depth of the first recess V1. Here, the depth X1 of the first recess V1 associated with the tooth tip 7 should be at least one - quarter of the upper profile thickness Y. In this example, Y = 0.25 mm, so X1 is at least 0.06 mm. In the case of this ratio, tests show that the fiber damage during the transfer of the fibers to the card clothing of the subsequent roller can be minimized.
[0029] According to Figure 2a - Figure 2cAs shown, the saw-tooth card clothing has at least two wavy recesses V1, V2 in the tooth flank 5, preferably at least three wavy recesses V1, V2, V3 in the tooth flank 5, wherein these recesses V1, V2, V3 have a greater curvature than the prior art, i.e., a smaller first radius. For this purpose, a smaller first radius R1 = R2 = R3 is adopted, which is at most 0.16 mm, preferably at most 0.15 mm. Preferably, the first radius can be at most R1 = R2 = R3 = 0.12 mm. As the distance from the tooth tip 7 increases, the wavy recesses V1, V2, V3 become more obvious, and thus are arranged deeper in the tooth flank 5, wherein each recess V1, V2, V3 starts from the tooth tip 7 and is at least 40% deeper than the previous recess with respect to the depth X1, X2, X3 of the tooth flank 5 or the distance from the tooth flank 5: 1.4x X1 = X2, 1.4x X2 = X3. For example, the first distance X1 between the first recess V1 and the tooth flank 5 can be 0.06 mm to 0.1 mm. The distance X2 between the second recess V2 and the tooth flank 5 is then 0.08 mm to 0.14 mm. The distance X3 between the third recess V3 and the tooth flank 5 can be 0.12 mm to 0.2 mm.
[0030] Observing the profile, the recesses V1-V3 form troughs, while the second radius RB connecting between the recesses V1-V3 on the tooth flank 5 forms crests. The troughs of the recesses V1-V3 are formed by the corresponding first radii R1-R3. The second radius RB and the first radii R1-R3 can be directly connected, or indirectly connected by sections A1.1, A1.2, A2.1, A2.2, A3.1, A3.2 of straight lines or curves, and these sections have different lengths and different inclinations with respect to the vertical or horizontal lines.
[0031] The transition section of the first radii R1, R2, R3 to the second radius RB of the tooth flank in the tooth flank 5 can be straight at least in the short sections A1.1...A3.2 and inclined with respect to the vertical lines A1.2, A2.2, A3.2 or the horizontal lines A1.1, A2.1, A3.1, so that the fibers are always forced to be transported towards the tooth tip 5. Here, the section from the tooth tip 5 to the tooth bottom 6 gradually becomes longer. The sections A1.1, A2.1, A3.1 are inclined upwards towards the tooth tip 7 with respect to the horizontal line at the respective relevant angles γ1, γ2 and γ3, and the angles γ1, γ2 and γ3 are at least 5° and at most 10°, in order to improve the transport of the fibers towards the tooth tip 7. The theoretically right angle between the horizontal sections A1.1, A2.1, A3.1 and the vertical sections A1.2, A2.2, A3.2 is increased by the angles γ1, γ2 and γ3.
[0032] The vertical sections A1.2, A2.2, A3.2 are inclined relative to the vertical line at respective angles δ1, δ2, δ3, which range from a minimum of 1° to a maximum of 8°, so that the theoretical right angles between the horizontal sections A1.1, A2.1, A3.1 and the vertical sections A1.2, A2.2, A3.2 are reduced by the angles δ1, δ2, δ3. This helps the fibers to first enter the first radii R1 - R3 and then continue to be transported towards the tooth tips. The transfer of the fibers to the card clothing of the subsequent roller is improved.
[0033] The tooth tip 7 has a greater inclination β relative to the vertical line starting from the first recess V1. The inclination β is 45° to 55°, preferably 50°, whereby the fibers can adhere to the tooth tip 5 and thereby the transfer of the fibers to the card clothing of the subsequent roller is improved. Accordingly, the transfer coefficient between the rollers is increased. The transition to the extended tooth flank 5 can be effected continuously via the radius r. By virtue of the additional inclination of the tooth tip 7 relative to the associated tooth flank 5, the fibers are held on the outermost periphery of the card clothing wound around the roller before transfer.
[0034] The advantage of the present invention is that, while the rotational speeds of the working roller and the deflecting roller on a roller-type carding machine are increased, the transfer coefficient increases, or in a flat carding machine the amount of fiber transfer between the cylinder and the doffer increases.
[0035] List of reference signs:
[0036] 1 Card clothing
[0037] 2 Tooth root
[0038] 3 Tooth
[0039] 4 Tooth back
[0040] 4.1, 4.2 Sections of the tooth back
[0041] 5 Tooth flank
[0042] 6 Tooth base
[0043] 7 Tooth tip
[0044] 8 First side
[0045] 9 Second side
[0046] A1.1... A3.2 Sections
[0047] B Width of the tooth root
[0048] H Card clothing height
[0049] H1 Tooth root height
[0050] H2 Tooth height
[0051] L Tooth pitch
[0052] Tip radius of the tooth
[0053] Root radius of the tooth
[0054] First radius of the recesses R1, R2, R3
[0055] Second radius of the tooth flank RB
[0056] Recesses V1, V2, V3
[0057] Distances X1, X2, X3
[0058] Tooth width at the tip of the tooth Y
[0059] Angle of the tooth flank α
[0060] Angle of the tooth tip β
[0061] Inclination of the recess V with respect to the horizontal line γ1, γ2, γ3; Inclination of the recess V with respect to the vertical line δ1, δ2, δ3; Angle of the tooth back ε
Claims
1. A saw-tooth card clothing for a flat or roller carding machine, having a tooth root (2) and a plurality of teeth (3) arranged successively and projecting from the tooth root (2), wherein each tooth (3) has a tooth flank (5), a tooth tip (7) and a tooth back (4), and each tooth back (4) passes into the tooth flank (5) of the next tooth (3) via a rounded tooth base (6), characterized in that, Each tooth (3) has at least two, preferably at least three, wave-shaped recesses (V1, V2, V3) (valleys) in its tooth flank (5), and these recesses increase as the distance from the tooth tip (7) increases, wherein the recesses (V1, V2, V3) are formed by a first radius (R1, R2, R3), and at least two of the first radii (R1, R2 or R2, R3) are directly or indirectly connected by a second radius (RB) respectively (peaks).
2. The sawtooth card clothing according to claim 1, characterized in that, The first recess (V1) in the region of the tooth tip (7) has a distance (X1) from the tooth flank (5), and as the distance from the tooth tip (7) increases, the distance (X2, X3) of each additional recess (V2, V3) from the tooth flank (5) is at least 40% greater than that of the previous recess (V1, V2).
3. The sawtooth card clothing according to claim 1, characterized in that, The first radii (R1, R2, R3) forming the recesses (V1, V2, V3) are at most 0.16 mm, preferably at most 0.15 mm, and particularly preferably at most 0.12 mm.
4. The sawtooth card clothing according to claim 1, characterized in that The second radius (RB) connecting the recesses (V1, V2, V3) has at most the dimension of the first radii (R1, R2, R3) of the recesses (V1, V2, V3).
5. The sawtooth card clothing according to claim 1, characterized in that, Horizontal and vertical sections (A1.1, A1.2, A2.1, A2.2, A3.1, A3.2) are arranged between the first radius (R1, R2, R3) and the second radius (RB), and these sections increase as the distance from the tooth tip (7) increases.
6. The sawtooth card clothing according to claim 5, characterized in that, The horizontal sections (A1.1 - A3.1) are inclined at an angle (γ1, γ2, γ3) with respect to the horizontal line towards the tooth tip (7) respectively.
7. The sawtooth card clothing according to claim 5, characterized in that, The vertical sections (A1.2 - A3.2) are inclined at an angle (δ1, δ2, δ3) with respect to the vertical line towards the inside of the recesses (V1, V2, V3) respectively.
8. The saw-tooth type card clothing according to claim 1, wherein, The tooth flank (5) has a flank angle (α) of 35° to 45° with respect to the vertical line, preferably 40°.
9. The sawtooth card clothing according to claim 1, wherein The flank angle (β) at the tooth tip (7) has an angle of 45° to 55° with respect to the vertical line, preferably 50°.
10. The saw-tooth type card clothing according to claim 1, characterized in that, The tooth back (4) has a straight or convex first section (4.1), and this first section transitions towards the tooth tip (7) to a convex second section (4.2).
11. The sawtooth card clothing according to claim 10, characterized in that, The straight or convex first section (4.1) of the tooth back has an angle (ε) of 50° to 70° with respect to the vertical line.
12. The sawtooth card clothing according to claim 2, wherein, The distance (X1) of the first recess (V1) is at least 25% of the tooth width (Y) at the tooth tip (7).
13. The saw-tooth type card clothing according to one of the preceding claims, which is configured to be used on a working roller or a deflecting roller of a roller carding machine, or on a doffer of a flat carding machine.