Carbon fiber heald beam and carbon fiber heald

Abstract

The present application belongs to the technical field of heald frame, and particularly relates to a carbon fiber heald frame beam and a carbon fiber heald frame. The present application comprises: a beam main body section; a beam sliding rail section connected with the beam main body section through a smooth transition section, the beam sliding rail section being used for connecting a heald inserting clamp; the beam main body section, the beam sliding rail section and the smooth transition section being made of outer layer cloth wrapping; the inside of the beam main body section being provided with a cavity, and the cavity being further provided with inner layer cloth, the inner layer cloth being attached to the outer layer cloth; the two ends of the cavity being provided with carbon fiber straight yarn bundles, and the inside of the beam sliding rail section also being provided with carbon fiber straight yarn bundles. The present application is used for solving the technical problems that the composite material heald frame in the prior art is easy to affect the action accuracy and is easy to be damaged in the environment of a high-speed loom.

Description

Technical Field

[0001] This invention belongs to the field of heald frame technology, specifically relating to a carbon fiber heald frame crossbeam and a carbon fiber heald frame. Background Technology

[0002] With the continuous development of loom technology, the working speed of looms is getting faster and faster, with some looms exceeding 1000 rpm (times per minute). This increase in loom speed has brought new challenges to various components within the loom.

[0003] The heald frame, as a crucial component of the loom, needs to move frequently and rapidly up and down within the loom. The greater its weight, the greater its inertia. To prevent malfunctions during rapid movement, existing technologies have explored combining carbon fiber with profiles to reduce overall weight. Specifically, a profile serves as the internal core, with carbon fiber fabric covering it.

[0004] However, actual tests have shown that this type of heald frame still has defects on high-speed looms. For example, at 1200 rpm, the different materials of this type of heald frame have large differences in density and inertia at high speeds. This can lead to inaccurate up-and-down movement of the heald frame or even tearing. Summary of the Invention

[0005] This invention provides a carbon fiber heald frame beam and a carbon fiber heald frame, which solves the technical problem that composite material heald frames in the prior art are prone to affecting the accuracy of operation and are easily damaged in the environment of high-speed looms. This invention includes: a main beam section; The crossbeam slide rail section is connected to the main crossbeam section via a smooth transition section, and the crossbeam slide rail section is used to connect the heddle clamp. The main body section of the crossbeam, the crossbeam slide rail section, and the smooth transition section are all wrapped with an outer layer of fabric. The main body section of the crossbeam has a cavity inside, and an inner layer of fabric is also provided inside the cavity. The inner layer of fabric is attached to the outer layer of fabric. The cavity is provided with carbon fiber straight yarn bundles at both ends, and the crossbeam slide rail section is also provided with the carbon fiber straight yarn bundles.

[0006] This invention eliminates the internal profiles and is made entirely of carbon fiber, which not only reduces weight and inertia but also has extremely high structural strength, making it compatible with high-speed looms.

[0007] Furthermore, the ratio of the thickness to the length of the main beam section ranges from 0.36% to 0.42%. The beneficial effects of this step are that the outer dimensions and thickness of the main beam section, as well as the wall thickness of the main beam section corresponding to the cavity position, have been designed, calculated, and verified. For the length of the main beam section in this application, which is the common 2360mm / 2415mm, under the two working conditions of 700rpm and 1200rpm, the first and second order frequencies of the heald frame are both outside the resonance region of the heald frame beam excitation frequency, and meet the minimum safety margin requirement of ±15%, thus preventing resonance.

[0008] Furthermore: the outer fabric includes a first fabric layer and a second fabric layer; The first layer of fabric is plain-weave carbon cloth; The second layer is a first carbon cloth with an axial angle of 0°, ±45°, or 90°; The inner layer fabric is a second carbon fabric whose axial direction is perpendicular to the axial direction of the second fabric layer; The second fabric layer is located between the first fabric layer and the inner fabric layer. The beneficial effects of this step are: by laying carbon fabrics with different axes and different weaving methods in layers, the structural rigidity of the heald frame beam can be improved in a targeted manner, its first-order frequency can be optimized, and resonance can be effectively avoided during the rotational speed change. At the same time, the multi-layer carbon fiber layup structure can effectively reduce the overall weight, taking into account both structural strength and lightweight requirements, adapting to the operating requirements of the loom at different speeds, and improving the operating stability of the loom and the service life of the heald frame beam.

[0009] Furthermore, the first carbon cloth, the second carbon cloth, and the plain weave carbon cloth are each woven from carbon fiber, and the carbon fiber strength of the first carbon cloth, the second carbon cloth, and the plain weave carbon cloth are complementary. The beneficial effect of this step is that it controls material costs while meeting performance requirements, achieving a balance between performance and cost.

[0010] Furthermore, both the outer and inner layers of fabric are made by epoxy resin casting and curing. The beneficial effects of this step are: epoxy resin has high bonding strength and good chemical stability. After casting and curing, it can tightly wrap the carbon cloth structure, fill the gaps in the carbon fiber weave, and prevent the carbon fiber from delaminating and loosening after long-term stress. At the same time, it can isolate moisture, dust and weaving oil stains in the external environment, reduce the risk of material corrosion and aging, extend the service life of the heald frame beam, and make it easier to clean and maintain later. Moreover, the epoxy resin itself has excellent rigidity after curing, which can further enhance the overall structural stability of the beam and adapt to the high-frequency reciprocating operation of high-speed looms.

[0011] Furthermore, the epoxy resin accounts for 26% to 29% of the weight of the carbon fiber heald frame beam. The beneficial effects of this step are: this ratio range can ensure sufficient structural rigidity after curing while avoiding an excessively high epoxy resin ratio that would increase the overall weight of the beam. It will not affect the inertial control of the heald frame during high-speed movement, nor will it cause insufficient filling of the carbon cloth gaps due to an excessively low epoxy resin ratio, thus failing to provide bonding and protection. This perfectly matches the dual requirements of high-speed looms for lightweight heald frame beams and structural strength.

[0012] Furthermore: the first carbon cloth and the second carbon cloth use large filament bundles, and the plain weave carbon cloth uses small filament bundles; or the first carbon cloth and the second carbon cloth use small filament bundles, and the plain weave carbon cloth uses large filament bundles. The beneficial effects of this step are: using carbon cloth with small filament bundles results in more nodes, softer cloth, and is more conducive to process development and resin impregnation; using carbon cloth with large filament bundles results in fewer nodes, harder cloth, and is more conducive to shape fixation and reduced deformation. The selection scheme that combines the two effects can have the advantages of both.

[0013] The present invention also provides a carbon fiber heald frame, comprising: A pair of carbon fiber heald frame crossbeams, as described above, serve as the upper crossbeam and the lower crossbeam, respectively; A pair of side stops for connecting to the upper crossbeam and the lower crossbeam.

[0014] The carbon fiber heald frame of this invention uses crossbeams made entirely of carbon fiber. Compared to the original core material plus carbon fiber covering structure, the overall density is uniform and consistent. During high-speed reciprocating motion, internal stress tearing will not occur due to the difference in inertia between different materials. The overall weight is lighter and the inertia is smaller, which can adapt to the working conditions of high-speed looms of 1000rpm or even 1200rpm. The operation is more accurate, the structural stability is better, the service life is longer, the installation and docking are simple, and the maintenance and replacement costs are lower, which can meet the development needs of existing high-speed looms.

[0015] The beneficial effects of this invention are: 1. This invention eliminates the traditional internal profile and carbon fiber covering structure. The entire structure is made of carbon fiber material, with uniform density in different locations. During high-speed reciprocating motion, internal stress will not be generated due to the difference in inertia of different materials, thus avoiding the problem of structural tearing from the root and greatly improving the structural stability and service life under high-speed conditions. 2. By combining the cavity structure with the layered carbon cloth design, the overall structural strength is guaranteed to meet the requirements, while reducing the overall weight of the crossbeam, reducing the inertia of high-speed movement, and making the operation more accurate. It can adapt to the operation requirements of high-speed looms of 1000rpm or even 1200rpm. 3. By laying out carbon cloth with different axial directions, different models and different filament sizes, the mechanical properties of the crossbeam can be optimized in a targeted manner. This can avoid the resonance zone and take into account the structural strength, deformation resistance and manufacturing cost, so as to meet the usage needs of looms with different speeds and specifications. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 A cross-sectional schematic diagram of a carbon fiber heald frame beam provided for this invention; Figure 2 This is a schematic cross-sectional view of a carbon fiber heald frame beam provided by the present invention.

[0018] Figure label: 1-Main section of crossbeam; 2-Crossbeam slide rail section; 3-Outer layer fabric; 4-Inner layer fabric; 5-Carbon fiber straight yarn bundle. Detailed Implementation

[0019] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention. It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0020] This application proposes a new carbon fiber heald frame crossbeam and a carbon fiber heald frame to address the defects of existing heald frames. Specifically, such as Figure 1 and Figure 2 As shown, the carbon fiber heald frame crossbeam includes: crossbeam main body section 1; The crossbeam slide rail section 2 is connected to the main crossbeam section 1 through a smooth transition section. The crossbeam slide rail section 2 is used to connect the heddle clamp. The main beam section 1, the crossbeam slide rail section 2, and the smooth transition section are all wrapped with an outer layer of cloth 3. The main beam section 1 has a cavity inside, and an inner layer of cloth 4 is also provided inside the cavity. The inner layer of cloth 4 is attached to the outer layer of cloth 3. The cavity has carbon fiber straight yarn bundles 5 at both ends, and the crossbeam slide rail section 2 also has carbon fiber straight yarn bundles 5 inside. The carbon fiber straight yarn bundles 5 serve to fill the skeleton, provide mechanical support, and strengthen its structural strength.

[0021] This application eliminates the internal profiles and is made entirely of carbon fiber, which not only reduces weight and inertia but also has extremely high structural strength, making it compatible with high-speed looms.

[0022] Based on the above technical solution, the ratio of the thickness to the length of the main beam section 1 ranges from 0.36% to 0.42%. With the width remaining constant, the longer the main beam section 1 is, the lower its first-order frequency. Within this range, the first-order frequency of the main beam section 1 does not exceed 14Hz. Taking 700rpm and 1200rpm as examples, the excitation frequency of the heald frame beam at 700rpm is approximately 11.5Hz, with a safety margin of ±15% of 9.775-13.225Hz. When the excitation frequency of the heald frame beam at 1200rpm is 19.5Hz, the safety margin of ±15% is 16.575-21.85Hz. Therefore, compared with the 700rpm and 1200rpm operating conditions, the first-order frequency of this application is far from the excitation frequency range of the heald frame beam at 1200rpm (including ±15% safety margin), and will not cause resonance, making it suitable for high-speed operating conditions.

[0023] Based on the above technical solution, the outer layer fabric 3 includes a first fabric layer and a second fabric layer; The first layer of fabric is plain-weave carbon cloth; The second layer is a first carbon cloth with an axial angle of 0°, ±45°, or 90°. Inner layer fabric 4 is a second carbon cloth whose axial direction is perpendicular to the axial direction of the second fabric layer; The second layer is located between the first layer and the inner layer. By laying carbon fabrics with different axes and weaves in layers, the structural rigidity of the heald frame beam can be improved in a targeted manner, its first-order frequency can be optimized, and resonance can be effectively avoided during the change of rotation speed. At the same time, the multi-layer carbon fiber structure can effectively reduce the overall weight, taking into account both structural strength and lightweight requirements, adapting to the operating requirements of the loom at different speeds, and improving the operating stability of the loom and the service life of the heald frame beam.

[0024] Based on the above technical solution, the first carbon cloth, the second carbon cloth, and the plain weave carbon cloth are all woven from carbon fibers, and the strength of the carbon fibers used in the first carbon cloth, the second carbon cloth, and the plain weave carbon cloth is complementary. The first carbon cloth and the second carbon cloth are woven from T300 carbon fibers, and the plain weave carbon cloth is woven from T700 carbon fibers, or the first carbon cloth and the second carbon cloth are woven from T700 carbon fibers, and the plain weave carbon cloth is woven from T300 carbon fibers. T300 carbon fibers have both good strength and ductility, while T700 carbon fibers have higher modulus and better stability. In order to control material costs while meeting performance requirements and achieve a balance between performance and cost, the material ratio can be flexibly adjusted to adapt to different demand scenarios, and can be selected according to actual needs.

[0025] Furthermore, both the first carbon fiber, the second carbon fiber, and the plain weave carbon fiber can use high-strength T700 carbon fiber, but the cost is relatively higher. The carbon fiber straight bundle 5 can also use T300 or T700 carbon fiber. This embodiment only uses T300 and T700 as examples, but the use of other performance grades of carbon fiber is not excluded.

[0026] Based on the above technical solution, both the outer layer 3 and the inner layer 4 are made by epoxy resin casting and curing. Epoxy resin has high bonding strength and good chemical stability. After casting and curing, it can tightly wrap the carbon cloth structure and fill the gaps in the carbon fiber weave, avoiding the problem of carbon fiber delamination and loosening after long-term stress. At the same time, it can isolate moisture, dust and weaving oil stains in the external environment, reduce the risk of material corrosion and aging, extend the service life of the heald frame beam, and make it easier to clean and maintain later. Moreover, the epoxy resin itself has excellent rigidity after curing, which can further enhance the overall structural stability of the beam and adapt to the high-frequency reciprocating operation of high-speed looms.

[0027] Based on the above technical solution, the weight of epoxy resin accounts for 26% to 29% of the weight of the carbon fiber heald frame beam. This proportion range can ensure sufficient structural rigidity after curing while avoiding excessive epoxy resin content that would increase the overall weight of the beam. It will not affect the inertial control of the heald frame during high-speed movement, nor will it cause insufficient filling of carbon cloth gaps due to excessive epoxy resin content, thus failing to provide bonding and protection. This perfectly matches the dual requirements of high-speed looms for lightweight heald frame beams and structural strength.

[0028] Based on the above technical solutions, the first and second carbon cloths use large filament bundles, while the plain weave carbon cloth uses small filament bundles; or the first and second carbon cloths use small filament bundles, while the plain weave carbon cloth uses large filament bundles. Using small filament bundle carbon cloth results in more nodes, a softer cloth, and is more conducive to process development and resin impregnation. Using large filament bundle carbon cloth results in fewer nodes, a stiffer cloth, and is more conducive to shape fixation and reduced deformation. The selection scheme that combines the two effects can have the advantages of both, ensuring molding accuracy and structural stability while reducing the difficulty of process processing, ensuring sufficient resin impregnation, further improving product qualification rate and comprehensive mechanical properties, and meeting the needs of industrial mass production.

[0029] Small tow generally refers to filaments below 24K, while large tow refers to filaments above 48K. K stands for thousand. For example, 24K means that each carbon fiber tow contains 24,000 monofilaments.

[0030] It should be noted that the first carbon cloth, the second carbon cloth, and the plain weave carbon cloth in this application are all based on the same basis weight when different filament bundles are selected, and the basis weight of the first carbon cloth and the second carbon cloth is much greater than that of the plain weave carbon cloth.

[0031] This application also provides a carbon fiber heel frame, comprising: A pair of carbon fiber heald frame crossbeams, as described above, serve as the upper crossbeam and the lower crossbeam, respectively; A pair of side rails for connecting to the upper and lower crossbeams.

[0032] The carbon fiber heald frame of this application uses crossbeams made entirely of carbon fiber. Compared with the original core material plus carbon fiber covering structure, the overall density is uniform and consistent. During high-speed reciprocating motion, internal stress tearing will not occur due to the difference in inertia between different materials. The overall weight is lighter and the inertia is smaller. It can be adapted to the working conditions of high-speed looms with speeds of 1000rpm or even 1200rpm. The operation is more accurate, the structural stability is better, the service life is longer, the installation and docking are simple, and the maintenance and replacement costs are lower, which can meet the development needs of existing high-speed looms.

[0033] Numerous specific details are set forth in this specification. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification. In the description of this specification, references to terms such as “one embodiment,” “some embodiments,” “example,” “specific example,” or “some examples,” etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, those skilled in the art can combine and integrate the different embodiments or examples described in this specification and the features of the different embodiments or examples without contradiction.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A carbon fiber heald frame crossbeam, characterized in that, include: Main section of the crossbeam; The crossbeam slide rail section is connected to the main crossbeam section via a smooth transition section, and the crossbeam slide rail section is used to connect the heddle clamp. The main body section of the crossbeam, the crossbeam slide rail section, and the smooth transition section are all wrapped with an outer layer of fabric. The main body section of the crossbeam has a cavity inside, and an inner layer of fabric is also provided inside the cavity. The inner layer of fabric is attached to the outer layer of fabric. The cavity is provided with carbon fiber straight yarn bundles at both ends, and the crossbeam slide rail section is also provided with the carbon fiber straight yarn bundles.

2. The carbon fiber heald frame beam according to claim 1, characterized in that, The ratio of the thickness to the length of the main beam section ranges from 0.36% to 0.42%.

3. The carbon fiber heald frame beam according to claim 1, characterized in that, The outer fabric includes a first fabric layer and a second fabric layer; The first layer of fabric is plain-weave carbon cloth; The second layer is a first carbon cloth with an axial angle of 0°, ±45°, or 90°; The inner layer fabric is a second carbon fabric whose axial direction is perpendicular to the axial direction of the second fabric layer; The second fabric layer is located between the first fabric layer and the inner fabric layer.

4. The carbon fiber heald frame beam according to claim 3, characterized in that, The first carbon cloth, the second carbon cloth, and the plain weave carbon cloth are each woven from carbon fibers, and the carbon fibers used in the first carbon cloth and the second carbon cloth are complementary in strength to those used in the plain weave carbon cloth.

5. The carbon fiber heald frame beam according to claim 4, characterized in that, Both the outer and inner fabric layers are made by epoxy resin casting and curing.

6. The carbon fiber heald frame beam according to claim 5, characterized in that, The epoxy resin accounts for 26% to 29% of the weight of the carbon fiber heald frame beam.

7. The carbon fiber heald frame beam according to claim 6, characterized in that, The first carbon cloth and the second carbon cloth use large filament bundles, and the plain weave carbon cloth uses small filament bundles; or the first carbon cloth and the second carbon cloth use small filament bundles, and the plain weave carbon cloth uses large filament bundles.

8. A carbon fiber heald frame, characterized in that, include: A pair of carbon fiber heald frame beams as described in any one of claims 1-7, serving as the upper beam and the lower beam, respectively; A pair of side stops for connecting to the upper crossbeam and the lower crossbeam.

Images