CN107345322B

CN107345322B - Fastener, apron rod subassembly and carding machine including this fastener

Info

Publication number: CN107345322B
Application number: CN201710296396.2A
Authority: CN
Inventors: 纳塔拉加安·钱德拉赛卡兰; 拉加卡努·苏雷什
Original assignee: Lakshmi Machine Works Ltd
Current assignee: Lakshmi Machine Works Ltd
Priority date: 2016-05-05
Filing date: 2017-04-28
Publication date: 2021-03-19
Anticipated expiration: 2037-04-28
Also published as: TR201706584U; CN107345322A

Abstract

A fastener for securing a card clothing strip to a flat bar of a carding machine is disclosed. The fastener includes a first connection portion capable of being connected to the deck rod and a second connection portion extending from the first connection portion. The second connecting portion is adapted to hold a needlework tape. The fastener has a material with a coefficient of thermal expansion that is less than a coefficient of thermal expansion of the material of the deck rod. The fastener of the invention maintains a uniform carding gap between the flat bar assembly and the carding drum when the temperature rises during operation of the carding machine. The invention also relates to a flat bar assembly for a carding machine, comprising the aforementioned fastener, and to a carding machine.

Description

Fastener, apron rod subassembly and carding machine including this fastener

Technical Field

The present invention relates generally to the field of textile machinery. The invention relates particularly, but not exclusively, to a carding machine. A further embodiment of the invention discloses a fastener for securing a card clothing strip to a flat bar of a carding machine.

Background

In the textile industry, carding machines are used to carry out carding operations. Carding is a mechanical process in which fiber bundles and fiber pieces are opened, unwound, and may be aligned in parallel directions. It may also be used to remove burrs and other foreign matter.

The carding process is of crucial importance in the spinning process, which determines quality and productivity. In addition to the basic function of removing impurities, neps and unwanted short fibers, carding machines convert the physical form of textile material from a wide and thick feed sheet into a string, which may be generally referred to as a sliver. The linear density of the feed sheet can be reduced from about 300 to about 800 grams per meter to about 3 to about 8 grams per meter of the output sliver. Rolls (from flat to covered with castellated needles) of varying diameter ranging from about 100mm to about 1250mm and having different surface characteristics may be provided in the carding machine. These rollers can run at a variety of speeds and can be very close to each other, perhaps a fraction of a millimeter. The sliver output rate can vary from about 40 meters to about 400 meters per minute. The operation of the carding machine can therefore be a delicate process that can be used to process single-fibre sheets called webs that can eventually be pressed into slivers.

With the development of the textile industry, modern textile carding machines have different carding elements, such as fixed and revolving flat. A basic carding action can be carried out between the carding drum (cylinder) and the cover plate. The fibers conveyed by the roller pins tend to move toward the cover plate, which may initially resist the movement of the fibers and then allow the fibers to float between the cover plate and the roller pins. This carding action separates the individual fibers, unwinds the entangled fibers, separates and removes neps and foreign particles from the cover sheet, and ultimately orients the fibers in the direction of drum motion. The arrangement of the cover plate relative to the drum can be considered to be a very important aspect in the textile industry. This arrangement implies the importance and accuracy requirements for the cover plate machining.

Traditionally, flats used in rotary flat cotton carding machines have been made by casting. Conventional flats comprise a card clothing portion for receiving the top of the card clothing and flat ends at each end of the flat for sliding engagement on corresponding flexible bends of the card. Conventional coverplates can present certain disadvantages, some of which become more severe in modern high-throughput carding. Due to its own weight, the cover plate must withstand considerable bending loads. Since the flats are beams supported only by their ends, the flats may be pulled toward the drum by the carding action. In order to withstand these inherent applied loads, the cover plate should have as large a moment of inertia as possible given the constraints imposed by the machine structure, which plays an important role in the design and manufacture of the cover plate. Conventional cover plates having a substantially uniform cross-section may be produced by extruding aluminum or an aluminum alloy, taking into account the accuracy and complexity of the machining.

Usually, the cover plates used in carding machines are equipped with clothing strips. The clothing strip may further be equipped with flexible U-shaped double hooks, entering more or less into the flexible textile layer and the plastic layer. The card cloth strip may be attached to the flat bar by a fastener such as a clip. The quality of the resulting card web will depend to a large extent on the set carding gap (the space between the clothing of the apron bar and the clothing of the cylinder). The carding nip can be set to typically 0.2mm to 0.3mm, depending on the material and speed of processing. The output carding quality can be directly proportional to the carding nip, with narrower nips always producing better quality. It is therefore very important to set the carding nip accurately. Studies have shown that the fluctuations and inaccuracies of the adjusted gap have a considerable negative effect on the quality of the carding process. In addition to a narrow carding nip, it is also very important to arrange the carding nip uniformly along the entire working width of the apron bar. The narrower the carding nip, the more difficult it is to adjust and keep the carding nip constant. The narrower the gap, the more sensitive it may be to temperature variations in operating conditions. During operation of the carding machine, the operating temperature of the flat bar may rise by 10 to 15 degrees celsius, depending on the material, process and air conditioning inside the factory. The carding nip still needs to be kept constant even under such temperature fluctuations. Thus, the choice of clip material may play a critical role in the variation of the carding nip. In conventional carding machines, the clips are usually made of steel.

One such clip arrangement is disclosed in U.S. patent No. 5898978 (hereinafter the "978 patent"). The clips disclosed in the' 978 patent are made of sheet metal and are used to secure clothing strips to the flat bar and to replace the clothing strips on the flat bar. These clips have a function of fixedly gripping the needlework tape. The clothing strip is fixed by establishing a positive connection between the clothing strip and the cover bar. Typically, the clips are used in pairs to ensure separate gripping on both sides of the deck rod. The clip has teeth at the top and can be inserted into the clothing strip, so that these teeth are connected with the clothing strip in a form-locking manner.

However, the steel clips have a different coefficient of thermal expansion compared to the aluminum material of the deck rods. Measurements have shown that deck bars with steel clips as fasteners can deform due to elevated temperatures. The reason for this may be that the steel clips are mounted to the deck rods at room temperature. When the temperature of the carding machine in the factory rises to the working temperature, the installed flat bar may return to the concave shape, and the carding gap at the center becomes large, thereby deteriorating the carding quality. One of the main reasons for the above limitations may be the difference in thermal expansion coefficient between the aluminum used as the deck rods and the steel clips used as fasteners on the top of the deck.

In view of the above, some attempts have been made to use the same material (aluminum) as that of the deck bar as the clip material. This is disclosed in Indian patent application No. 1326/CHENP/2003. However, the holding strength of the card cloth strip is proportional to the tensile strength of the fastener, while the tensile strength of the aluminum used as the fastener is very small. Thus, the problems associated with buckling of the deck rods during operation remain unresolved.

The present invention is directed to overcoming one or more of the limitations set forth above.

Disclosure of Invention

The disclosed assembly overcomes one or more of the disadvantages of conventional configurations/assemblies and the assembly described herein provides additional advantages.

Additional features and advantages are realized through the techniques of the present invention. Other embodiments and aspects of the invention are described in detail herein and are considered a part of the claimed disclosure.

In one non-limiting embodiment of the present invention, a fastener is disclosed for securing a card clothing strip to a flat bar of a carding machine. The fastener includes a first connection portion capable of being connected to the deck rod and a second connection portion extending from the first connection portion. The second connecting portion is adapted to hold a needlework tape. The fastener has a material with a coefficient of thermal expansion that is less than a coefficient of thermal expansion of the material of the deck rod.

In one embodiment of the invention, the material of the fastener has a higher tensile strength than the material of the deck rod.

In one embodiment of the invention, the material of the deck rod is aluminum and/or an aluminum alloy.

In one embodiment of the invention, the material of the fastener is brass and/or a brass alloy.

In one embodiment of the invention, the second connecting portion comprises a plurality of teeth for securing at least a portion of the clothing strip.

In one embodiment of the invention, the fastener has a coefficient of thermal expansion of 18.7 x 10^-6m/DEG C to 20.5 x 10^-6m/DEG C rangeAnd (4) the following steps.

In one embodiment of the invention, the fastener has a tensile strength of 280N/mm²To 380N/mm²Within the range.

In another non-limiting embodiment of the present invention, a flat bar assembly for a carding machine is disclosed. The card clothing strip assembly comprises a card clothing strip and at least one fastener, wherein the card clothing strip is fixed on the card clothing strip, and the at least one fastener extends from any end of the card clothing strip and is used for fixing the card clothing strip on the card clothing strip. Each of the at least one fastener includes a first connection portion connected to the deck rod and a second connection portion extending from the first connection portion. The second connecting portion is adapted to hold the needlework tape. The at least one fastener has a material with a coefficient of thermal expansion that is less than a coefficient of thermal expansion of a material of the deck rod.

In one embodiment of the invention, the material of each of the at least one fastener has a higher tensile strength than the material of the deck rod.

In one embodiment of the invention, the material of the deck rod is aluminum and/or an aluminum alloy and the material of each of the at least one fastener is brass and/or a brass alloy.

In one embodiment of the invention, the second connecting portion of each of the at least one fastener comprises a plurality of teeth for securing at least a portion of the clothing strip.

It should be understood that the above-described aspects and embodiments of the invention may be used in any combination with each other. Several of the described aspects and embodiments may be combined together to form another embodiment of the invention.

The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will be apparent by reference to the drawings and the following detailed description.

Drawings

The novel features and characteristics of the present invention are set forth in the appended description. The invention itself, however, as well as a preferred mode of use, further objectives and advantages thereof, will best be understood by reference to the following detailed description of an illustrative embodiment when read in conjunction with the accompanying drawings. One or more embodiments will now be described, by way of example only, with reference to the accompanying drawings, in which like references indicate similar elements, and in which:

FIG. 1 shows a perspective view of a flat bar of a carding machine according to an exemplary embodiment of the invention, wherein the card clothing strip is secured by fasteners;

FIG. 2 shows a side view of the deck rod of FIG. 1;

FIG. 3 shows a side view of a flat bar assembly for a carding machine having a fastener arrangement for securing a card clothing strip to the flat bar, according to some embodiments of the invention;

fig. 4 shows a schematic front view of a section of a carding machine according to an exemplary embodiment of the invention, wherein the section has a flat bar configuration.

Wherein the elements are numbered as follows:

Detailed Description

The figures illustrate embodiments of the invention for illustrative purposes only. One skilled in the art will readily recognize from the following description that alternative embodiments of the methods described herein may be employed without departing from the principles of the invention described herein.

The foregoing has outlined rather broadly the features and technical advantages of the present invention in order that the detailed description of the invention that follows may be better understood. Additional features and advantages of the invention will be described hereinafter which form the subject of the description of the invention. Those skilled in the art will appreciate that equivalent means do not depart from the scope of the invention. The novel features which are believed to be characteristic of the invention, both as to its organization and method of operation, together with further objects and advantages will be better understood from the following description when considered in connection with the accompanying figures. It is to be expressly understood, however, that each of the figures is provided for the purpose of illustration and description only and is not intended as a definition of the limits of the present invention.

In the present invention, the word "exemplary" is used herein to mean "serving as an example, instance, or illustration. Any embodiment or implementation of the subject matter described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that there is no intention to limit the invention to the specific forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the scope of the invention.

As used in this specification, the terms "comprises" and "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a component comprising a plurality of elements or steps does not include only those elements or steps, but may include other elements or steps not expressly listed or inherent to such arrangement or method. In other words, one or more components in an assembly after "comprising" does not exclude the presence of other or additional components in the assembly, without further constraints.

A fastener for securing a card clothing strip to a flat bar of a carding machine is disclosed. In one embodiment, the carding machine may comprise a plurality of flat bars, each provided with a clothing strip that may be fastened to the flat bar by fasteners. The fastening means serve to hold the card clothing strip firmly on the flat bar during the carding process.

According to an exemplary embodiment of the invention, the fastening means may be in the form of clips and/or clamps, such that at least one clamp is provided on both ends of the flat bar to secure the card clothing strip to the flat bar. In one embodiment, at least a portion of the card cloth strip may be retained by at least one fastener. The fastener includes two connecting portions, a first connecting portion and a second connecting portion. A first connector can be connected to the flat bar and a second connector extends from the first connector to retain the card cloth strip. In one embodiment, the second connecting portion of the fastener comprises a plurality of teeth to retain at least a portion of the clothing strip such that a form-locking connection is established between the fastener and the clothing strip. The card clothing strip may have a flexible or semi-rigid card clothing which is inserted or pressed into a less flexible or plastic layer separately.

In one embodiment of the invention, a material having a coefficient of thermal expansion less than the coefficient of thermal expansion of the deck rod material may be selected as the material for the fastener. Further, a material having a tensile strength greater than that of the deck rod is selected as the material of the fastener. Typically, the deck rods may be made of a material such as a light metal or light metal alloy. In one embodiment, the material of the deck rod may be aluminum and/or an aluminum alloy. Brass and/or brass alloys are therefore chosen as the material of the fastener, taking into account the material of the deck rod and taking into account the parameters of thermal expansion coefficient and tensile strength. Thus, the brass or brass alloy from which the fastener is made has a lower coefficient of thermal expansion than the aluminum from which the deck rod is made, and the fastener has a greater tensile strength than the deck rod. Brass is a metal alloy made from zinc and copper, the proportions of which can be varied to produce brass alloys having different properties within the desired range. Thus, by using brass or a brass alloy as the fastener material, which has a lower coefficient of thermal expansion than the deck rod, measurements have shown that the deck rod deforms less over different temperature ranges than fasteners made using conventionally known materials such as steel or aluminum. Furthermore, brass has a much higher tensile strength than aluminum, and bending of the deck rods can be avoided. Thus, the carding nip is kept to a minimum, improving the quality of the card web obtained during carding. In one embodiment, brass is used as the material for the fastener, and the cover bar has a concavity at 10 degrees celsius of 0.02mm to 0.03 mm. The results are better compared to the materials of conventionally known fasteners, for example, steel with a concavity of 0.11mm to 0.15 mm.

The invention is described below with the aid of one or more figures of exemplary embodiments. However, these exemplary embodiments should not be construed as limiting the present invention. While one section of the card is shown in the figures as having one of the specific configurations, it should be noted that slight variations in the configuration of the section of the card are considered to be part of the present invention.

Fig. 1 is an exemplary embodiment of the invention, showing a perspective view of a flat bar 1 of a carding machine, with a clothing strip 2 fixed to the flat bar 1 by fasteners 3 (as shown in fig. 2). The carding machine or a section of the carding machine may comprise a plurality of flat bars arranged above the carding drum. The carding drum may transport fibers such as cotton fibers, and a plurality of flat bars, including a clothing strip, provide resistance to movement of the cotton fibers. During this time, the entangled fibers are removed and converted into fine threads. For simplicity, fig. 1 shows a single flat bar 1 among a plurality of flat bars in a carding machine. In order to obtain a high quality card web during carding, the card wire 1 can be made with a uniform cross section or a substantially uniform cross section over its entire length. To meet this requirement, the deck rod 1 may be generally made of a light metal or an alloy of light metals. In one embodiment, the deck rod 1 is made of aluminum or an aluminum alloy. The clothing strips 2 arranged on the flat bar 1 can have flexible or semi-rigid clothing, so that they are inserted and pressed individually into the fabric layer and the plastic layer.

Further, the needlework tape 2 is fixed to the apron bar 1 using a fastener 3. The fasteners 3 may be clips or clamps provided on both sides of the deck rod 1. In one embodiment, there may be more than one fastener 3 at one end of the deck rod 1. The fastener 3 includes two connecting portions, i.e., a first connecting portion 3a and a second connecting portion 3 b. The first connecting portion 3a can be connected to the apron bar 1, and the second connecting portion 3b is configured to hold the needlework tape 2. In one embodiment, the first connection portion 3a may be in the form of an inverted "L" shape and may be pressed around the rib of the deck rod 1. Further, the second connection portion 3b may be configured in a "C" or "L" shape extending from the first connection portion 3 a. The second connecting portion 3b may have a plurality of teeth to establish a form-locking connection with the clothing strip 2, so that the clothing strip 2 is firmly fixed to the flat bar 1 along the entire length of the flat bar 1.

In one embodiment of the invention, a material having a coefficient of thermal expansion less than that of the material of the deck rod 1 is selected as the material of the fastener 3. Further, a material having a tensile strength greater than that of the material of the deck rod 1 is selected as the material of the fastener 3. As described in the preceding paragraph, the material of the deck rod 1 is aluminum and/or an aluminum alloy. Thus, brass and/or a brass alloy is chosen as the material of the fastening member 3, taking into account the material of the deck rod 1 and taking into account the parameters of thermal expansion coefficient and tensile strength.

The brass or brass alloy from which the fastener 3 is made has a lower coefficient of thermal expansion than the aluminum from which the deck rod 1 is made, and the fastener 3 has a greater tensile strength than the deck rod 1. In one embodiment, the coefficient of thermal expansion of the brass chosen as the material of the fastener 3 may be 18.7 x 10^-6m/DEG C to 20.5 x 10^-6Smaller than aluminum in the range of m/DEG C, and has a tensile strength 3 to 3.5 times that of aluminum. Thus, the combined effect of the lower coefficient of thermal expansion and the higher tensile strength of the brass material as fastener 3 maintains a uniform carding gap even when there is a temperature change during carding. Thus, bending of the card flat bar 1 due to temperature changes can be avoided, while the tensile strength of the brass material is sufficient to hold the card cloth strip 2 firmly.

Referring now to fig. 2 and 3, fig. 3 shows a side view of a flat bar assembly 10 of a carding machine, the flat bar assembly 10 having a fastener 3 arrangement for securing a clothing strip 2 to a flat bar 1. A flat bar assembly 10, which is part of a carding machine, comprises a flat bar 1 and a clothing strip 2 fixed to the flat bar 1 by fasteners 3. As shown in fig. 2 and 3, the fasteners 3 may be used in pairs to ensure separate clamping on both sides of the deck rod 1. The first connecting portion 3a of the fastener 3 can be connected to the deck lever 1. In one embodiment, the first connection portion 3a may be pressed around the rib of the deck rod 1 by a suitable tool. The second connecting portion 3b may be adapted to hold the needlework tape 2. The second connecting portion 3b may comprise a plurality of teeth arranged next to one another in order to establish a form-locking connection with the clothing strip 2. This connection ensures that the clothing strip 2 is held firmly on the flat bar 1 during the carding process. In one embodiment, more than one fastener 3 may be provided on either side of the coverboard bar 1 to retain at least a portion of the needlework tape 2.

As described in the preceding paragraph, the fastener 3 is made of brass or a brass alloy.

TABLE 1

Fastening piece	Aluminium	Brass
			Coefficient of thermal expansion (10)^-6m/℃)	23.1	18.7 to 20.5
Ultimate tensile strength (N/mm)²)	90	280 to 380

Table 1 shows a comparison of the thermal expansion coefficient and the ultimate tensile strength values for brass and aluminum. As shown in table 1, it is clear that brass has a smaller coefficient of thermal expansion than aluminum and a greater tensile strength than aluminum.

Thus, by using brass or a brass alloy as the material of the fastening member 3, the carding gap can be uniformly maintained without being seriously affected by the temperature. Further, by using brass as a material of the fastening member 3 for fastening, the middle portion of the deck bar 1 can be prevented from being bent. In addition, since the tensile strength of the brass material is sufficiently large, the clothing tape 2 can be firmly held on the apron bar 1 during the carding process.

Referring now to fig. 4, fig. 4 shows a schematic front view of a section of a carding machine with a flat arrangement on a carding drum 5. As shown in FIG. 4, the carding section of a carding machine (not shown) comprises a carding cylinder 5 having a predetermined diameter. The carding drum 5 may be covered by a clothing tape (not shown) having a predetermined thickness. Carding drum 5 may rotate at a variable speed such that it picks up a mass of fibers, such as but not limited to cotton fibers, from one end and outputs linear fibers from the other end. Furthermore, the carding section comprises a cover arrangement 4 arranged on a carding drum 5. The lid arrangement 4 comprises a plurality of lid bar assemblies 10 arranged in the form of a conveyor. The cover arrangement 4 may be used with one or more drive rollers 6 for driving the cover bar assembly 10. In one embodiment, the cover arrangement 4 may be operated in the opposite direction to the rotation of the carding drum 5. The flat arrangement 4 is mounted on the carding drum 5 so as to maintain a preset carding gap between the carding drum 5 and the flat bar assembly 10 of the flat arrangement 4. As described in the above paragraph, the flat bar assembly 10 includes the needlework tape 2, and the needlework tape 2 is mounted using the fastener 3 made of brass or a brass alloy. The clothing strip 2 may comprise a plurality of grids or protrusions which may wind cotton fibers into a thread. The fastening element 3 is made of brass, which prevents the fastening element 3 from expanding due to the temperature increase during operation of the carding machine. This prevents the flat bar 10 from warping, thereby maintaining a uniform carding gap during carding. This improves the yield and efficiency of the carding process.

Advantages of the invention

A fastener made of brass or a brass alloy has a low coefficient of thermal expansion to ensure that the carding nip is not altered by temperature changes during the carding process, thereby improving the carding web produced by the carding process. Furthermore, because of the high tensile strength of brass or brass alloys, the fastener can hold the card clothing strip securely to the flat bar during carding.

Equivalents of

With respect to virtually any plural or singular terms used herein, those of skill in the art can translate from the plural to the singular and/or from the singular to the plural as is appropriate to the context and/or application. Various singular/plural permutations may be expressly set forth herein for the sake of clarity.

It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended claims) are generally regarded as "open" terms (e.g., the term "including" should be interpreted as "including but not limited to," the term "having" should be interpreted as "having at least," the term "includes" should be interpreted as "includes but is not limited to," etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases "at least one" and "one or more" to introduce claim recitations. However, the use of these phrases should not be construed to mean: where the claim recitation is directed to claim recitations by the indefinite article "a" or "an," the use of the indefinite article "a" or "an" limits any particular claim having such introduced claim recitation to inventions having only one such recitation, even when the same claim includes the introductory phrases "one or more" or "at least one" and indefinite articles such as "a" or "an" (e.g., "a" or "an" should typically be interpreted to mean "at least one" or "more"); the same holds true for the use of definite articles used to describe the recitation of claims. In addition, even if specific numbers are recited in the claims as they are directed, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of "two recitations," without other modifiers, typically means at least two recitations, or two or more recitations). Further, where similar to commonly used "at least one of A, B and C, etc." is used, in general such a sentence is intended to be a common meaning as understood by one of skill in the art (e.g., "a system having at least one of A, B and C" shall include, but not be limited to, systems having a alone, B alone, C alone, a and B together, a and C together, B and C together, and/or A, B and C together, etc.). In other instances where a phrase similar to the commonly used "A, B or at least one of C" is used, such a sentence is generally intended to be understood by one of skill in the art (e.g., "a system having at least one of A, B or C" shall include but not be limited to systems having only a, only B, only C, having a and B, having a and C, having B and C, and/or having A, B and C, etc.). It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, abstract, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase "a or B" should be understood to include the possibility of "a", "B" or "a and B".

Although various aspects and embodiments have been disclosed herein, other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments disclosed herein are for purposes of illustration and are not intended to be limiting, with the true scope and spirit being indicated by the following claims.

Claims

1. A fastener (3) for securing a clothing strip (2) on a flat bar (1) of a carding machine, the fastener (3) comprising:

a first connecting portion (3a) capable of being connected to the deck bar (1), and

a second connecting portion (3b) extending from the first connecting portion (3a), wherein the second connecting portion (3b) is adapted to hold the needlework tape (2);

wherein the coefficient of thermal expansion of the material of the fastening element (3) is smaller than the coefficient of thermal expansion of the material of the deck rod (1), and the material of the fastening element (3) has a higher tensile strength than the material of the deck rod (1); and

wherein the material of the fastener (3) is brass and/or a brass alloy.

2. The fastener (3) according to claim 1, wherein the material of the deck rod (1) is aluminum and/or an aluminum alloy.

3. The fastener (3) according to claim 1, wherein the second connecting portion (3b) comprises a plurality of teeth for fixing at least a portion of the clothing strip (2).

4. The fastener (3) of claim 1, wherein the fastener (3) has a coefficient of thermal expansion of 18.7 x 10^-6m/DEG C to 20.5 x 10^-6m/DEG C.

5. The fastener (3) according to claim 1, wherein the tensile strength of the fastener (3) is 280N/mm²To 380N/mm²Within the range.

6. A flat bar assembly (10) for a carding machine, comprising:

a apron rod (1);

a needle cloth belt (2) fixed on the cover plate rod (1); and

at least one fastener (3) configured on either end of the coverboard bar (1) for securing the needlework tape (2) on the coverboard bar (1), wherein each of the at least one fastener (3) comprises:

a first connecting portion (3a) connected to the deck bar (1), and

wherein the coefficient of thermal expansion of the material of each of the at least one fastener (3) is less than the coefficient of thermal expansion of the material of the deck rod (1), and the material of the fastener (3) has a higher tensile strength than the material of the deck rod (1); and

wherein the material of the fastener (3) is brass and/or a brass alloy.