Cam for a knitting machine

Abstract

A kind of cam block for knitting machine, including working groove and positioning hole arranged on cam block body, it is characterized in that honeycomb compartment is arranged on cam block body, compartment penetrates the top surface and bottom surface of cam block body, compartment is distributed in the both sides of working groove and the periphery of positioning hole, certain wall thickness t is reserved between compartment and compartment, between compartment and positioning hole and between compartment and needle groove, and 0.45mm≤t≤0.9mm.

Description

Technical Field

[0001] The present application relates to a textile machine, in particular to a cam for a textile machine. Background Art

[0002] Most of the existing cams for textile machines are of traditional solid structure, which causes that heat generated by friction during long-term use of the cam cannot be dissipated in time. Excessive heat concentration leads to local high temperature. Too high temperature under long-term heat accumulation further causes thermal deformation of the outer needle cylinder.

[0003] CN212611194U discloses a wear-resistant cam for knitting machines, wherein a mounting hole is arranged at the top of the cam body, a chute is arranged at the top of the cam body, a protective layer is arranged on the surface of the cam body, the protective layer comprises a wear-resistant layer, a high temperature-resistant layer, a corrosion-resistant layer and a heat-conducting layer, the high temperature-resistant layer is arranged at the bottom of the wear-resistant layer, the high temperature-resistant layer is arranged at the bottom of the high temperature-resistant layer, the corrosion-resistant layer is arranged at the bottom of the high temperature-resistant layer, and the heat-conducting layer is arranged at the bottom of the corrosion-resistant layer. A heat dissipation hole is arranged on the right side of the cam body. Although the cam structure with a circular hole on the side claims to have a heat dissipation effect, the side is not the main working friction surface, and only the side can be provided with holes due to the arrangement of the wear-resistant layer, high temperature-resistant layer, corrosion-resistant layer and heat-conducting layer on the front side, which further results in an unsatisfactory heat dissipation effect.

[0004] CN222648276U discloses an adjustable knitting machine cam, wherein a heat dissipation layer is attached to the inner wall of a needle track, the outer wall of the heat dissipation layer is attached to a wear-resistant layer, the heat dissipation layer is made of aluminum alloy, the inner wall of the heat dissipation layer is attached to a heat dissipation hole, and the outer end of the heat dissipation hole communicates with a through groove. The through groove is arranged inside the cam member, the cam member is arranged in a "匚"-shaped structure, two ends of the through groove penetrate through the front side of the cam member, and a row of through grooves is arranged at equal intervals. When the needle generates heat due to friction during needle movement, the heat is transferred to the heat dissipation layer through the wear-resistant layer, achieving the effect of heat conduction and dissipation through the heat dissipation layer. Moreover, the heat can enter the through groove through the heat dissipation hole, and then be discharged through the heat dissipation hole and the through groove, thereby preventing heat from remaining on the inner wall of the needle track and avoiding the influence of heat accumulation on the use effect. Transferring the heat through the wear-resistant layer to the heat dissipation layer leads to an unsatisfactory heat dissipation effect. Summary of the Invention

[0005] In view of the problems existing in the above-mentioned prior art, the present application provides a cam with honeycomb holes, which greatly improves the heat dissipation performance without affecting the original service performance.

[0006] To achieve the above objectives, the technical solution adopted in this application is: a triangular block for a knitting machine, comprising a working groove and a positioning hole disposed on the body of the triangular block, characterized in that honeycomb-shaped compartments are disposed on the body of the triangular block, the compartments penetrating the top and bottom surfaces of the body of the triangular block, the compartments being distributed on both sides of the working groove and around the positioning hole, and the wall thickness t between compartments, between compartments and positioning holes, and between compartments and needle grooves, wherein 0.45mm≤t≤0.9mm.

[0007] The compartment on the top surface of the triangular block is a regular hexagon, with a side length L of 1.16mm ≤ L ≤ 2.03mm.

[0008] Furthermore, the side length of the regular hexagonal compartment is 1.45mm ≤ L ≤ 1.74mm.

[0009] Furthermore, the side length of the regular hexagonal compartment is L = 1.595 mm.

[0010] The triangular blocks used in the textile machine are injection molded from metal powder.

[0011] Compared with existing technologies, the beneficial effects of this solution are as follows: the lowest average surface temperature after opening the corresponding honeycomb holes is 129.4℃, while the lowest temperature in the comparative example is 161.3℃, representing a reduction of 31.9℃ and 19.8%, respectively, demonstrating a significant heat dissipation and cooling effect. The triangular block with honeycomb-shaped compartments, with a reserved wall thickness in the working area, will not affect the original performance. The hexagonal shape of the compartments on the top surface of the triangular block effectively increases the stress-bearing area, thereby improving strength. The large surface area provides excellent heat dissipation performance, reducing heat accumulation and preventing deformation of the outer syringe due to excessive heat. Attached Figure Description

[0012] Figure 1 A schematic diagram of the upper surface structure of a triangular block used in a knitting machine; Figure 2 This is a schematic diagram of the lower surface structure of a triangular block used in a knitting machine. Figure 3 A schematic diagram of the isometric structure of a triangular block used in a knitting machine; Figure 4 This is a schematic diagram of a regular hexagonal hole on the side of Example 13; Figure 5 This is a schematic diagram of a regular hexagonal hole provided along the groove on the front side in Example 14; Figure 6 A schematic diagram showing a circular hole on the side of Example 18; Figure 7 This is a schematic diagram of a circular hole provided along the groove on the front side of Example 19; Figure 8 Curves of compressive strength and surface temperature for different wall thicknesses of hexagonal compartments with triangular blocks on the front of knitting machines; Figure 9 The curves of compressive strength and surface temperature for different side lengths of the hexagonal compartments with triangular blocks on the front of a knitting machine.

[0013] In the diagram: 1 - Triangular block body; 2 - Working groove; 3 - Positioning hole; t - Wall thickness; L - Side length of regular hexagon; R - Radius of circle. Detailed Implementation

[0014] The following will provide a further explanation of this scheme in conjunction with the accompanying drawings.

[0015] Example 1: As Figure 1-3 As shown, a triangular block for a knitting machine includes a working groove and a positioning hole set on the body of the triangular block. The feature is that a honeycomb-shaped compartment is provided on the body of the triangular block, the compartments penetrate the top and bottom surfaces of the body of the triangular block, and the compartments are distributed on both sides of the working groove and around the positioning hole. A certain wall thickness t is reserved between the compartments, between the compartments and the positioning hole, and between the compartments and the needle groove, with 0.45mm≤t≤0.9mm.

[0016] This embodiment features a hexagonal compartment structure. While prioritizing a wall thickness of t, through-holes are formed at the edges to connect with the hexagonal compartments. The side length of the hexagonal compartment is L = 1.595 mm; the wall thickness t = 0.75 mm between compartments, between a compartment and a positioning hole, and between a compartment and a needle groove. The triangular blocks used in the textile machine are injection molded from metal powder.

[0017] This product is formed by metal powder injection molding in one step. The specific steps are: mixing metal powder and binder to make feedstock, injection molding to form green embryo, degreasing and removing binder from green embryo, sintering molding, and post-processing.

[0018] Key performance indicators include: compressive strength, surface area, and heat dissipation.

[0019] The compressive strength of the triangular block refers to the ability of the honeycomb triangular block to resist compressive stress without being destroyed. The specific test steps are as follows: use a WDW-100D micro-controlled electronic universal testing machine to measure and record the radial and axial compressive strength of the triangular block compartments.

[0020] The surface area of ​​the triangular block is the sum of the area of ​​the block itself and the area of ​​the compartment. The specific indicator of the triangular block's heat dissipation performance is the average temperature of three points in the working tank under the condition of heating and cooling for the same amount of time. This method can be used to illustrate the heat dissipation capacity of the triangular block.

[0021] The specific testing steps are as follows: After heating the triangular block for 10 seconds using the V-2040T microcomputer heating platform, cool it for 5 seconds, use the Ti200 infrared thermometer to test the temperature of three points in the working groove of the triangular block (the same points are taken for each triangular block), record the temperature, and take the average value.

[0022] Example 2: This example is the same as Example 1 and will not be described here. The difference is that the wall thickness t between compartments, between compartments and positioning holes, and between compartments and needle grooves is 0.6 mm.

[0023] Example 3: This example is the same as Example 1 and will not be described here. The difference is that the wall thickness t between compartments, between compartments and positioning holes, and between compartments and needle grooves is 0.45mm.

[0024] Example 4: This example is the same as Example 1 and will not be described here. The difference is that the wall thickness t between compartments, between compartments and positioning holes, and between compartments and needle grooves is 0.3 mm.

[0025] Example 5: This example is the same as Example 1 and will not be described here. The difference is that the wall thickness t between compartments, between compartments and positioning holes, and between compartments and needle grooves is 0.9 mm.

[0026] Example 6: This example is the same as Example 1 and will not be described here. The difference is that the wall thickness t between compartments, between compartments and positioning holes, and between compartments and needle grooves is 1.05mm.

[0027] Example 7: This example is the same as Example 1 and will not be described here. The difference is that the side length L of the regular hexagonal compartment is 1.45mm.

[0028] Example 8: This example is the same as Example 1 and will not be described here. The difference is that the side length L of the regular hexagonal compartment is 1.74mm.

[0029] Example 9: This example is the same as Example 1 and will not be described here. The difference is that the side length L of the regular hexagonal compartment is 1.16mm.

[0030] Example 10: This example is the same as Example 1 and will not be described here. The difference is that the side length L of the regular hexagonal compartment is 0.87mm.

[0031] Example 11: This example is the same as Example 1 and will not be described here. The difference is that the side length L of the regular hexagonal compartment is 2.03mm.

[0032] Example 12: This example is the same as Example 1 and will not be described here. The difference is that the side length L of the regular hexagonal compartment is 2.32mm.

[0033] Example 13 (Comparative Example): This example is the same as Example 1 and will not be described here. The difference is that the regular hexagonal compartment is located on the side.

[0034] Example 14 (Comparative Example): This example is the same as Example 1 and will not be described here. The difference is that the hexagonal compartments are located on both sides of the needle groove.

[0035] Example 15 (Comparative Example): This example features a circular structure. While prioritizing a wall thickness of t at the edges, through-holes are formed to connect with the regular hexagonal compartments. The radius R of the circular compartment is 1 mm; the wall thickness t between compartments, between a compartment and the positioning hole, and between a compartment and the needle groove is 0.75 mm. Example 16 (Comparative Example): This example is the same as Example 15 and will not be described here. The difference is that the radius of the circular compartment R = 2 mm.

[0036] Example 17 (Comparative Example): This example is the same as Example 15 and will not be described here. The difference is that the radius R of the circular compartment is 2.5 mm.

[0037] Example 18 (Comparative Example): This example is the same as Example 15 and will not be described here. The difference is that the circular compartment is located on the side.

[0038] Example 19 (Comparative Example): This example is the same as Example 15 and will not be described here. The difference is that the circular compartments are located on both sides of the needle groove.

[0039] Based on the results of the above embodiments, detailed results are shown in Table 1. Table 1: Summary of results for Examples 1 to 19.

[0040] Example 1 5700 82600 143.55 141.3 Example 2 4312 62040 157.905 129.4 Example 3 4120 35400 215.325 121.3 Example 4 3760 35600 287.1 113.6 Example 5 5100 89250 122.0175 151.3 Example 6 10920 83980 93.3075 158.6 Example 7 5400 94560 156.6 131.3 Example 8 7315 80940 148.77 137.4 Example 9 14525 116550 182.7 124.9 Example 10 41900 291000 391.5 98.5 Example 11 4400 78400 146.16 139.5 Example 12 2880 60840 125.28 149.6 Example 13 38900 / 81.109 165.9 Example 14 43700 / 93.52 161.3 Example 15 10780 171600 285.77 114.93 Example 16 2085 76200 155.945 130.78 Example 17 1935 73260 123.9 151.04 Example 18 30900 / 80.019 168.03 Example 19 32720 / 92.47 163.26 In Table 1, in Example 1, with a hexagonal compartment side length L of 1.595 mm and a wall thickness of 0.75 mm, the honeycomb triangular blocks exhibit high compressive strength, large surface area, and low average surface temperature. Based on this, in Example 2, the wall thickness (hereinafter referred to as wall thickness) t between compartments, between a compartment and a positioning hole, and between a compartment and a needle groove is changed to 0.6 mm. The strength of the honeycomb triangular blocks decreases, but the surface area increases, resulting in a lower average surface temperature. In Example 3, with the hexagonal compartment side length unchanged and the wall thickness t reduced to 0.45 mm, the radial compressive strength of the honeycomb triangular blocks still meets the requirements. When the hexagonal compartment side length remains unchanged and the wall thickness is reduced to 0.3 mm as in Example 4, the radial compressive strength of the triangular blocks does not meet production requirements and fails in actual working conditions. Example 5 is based on Example 1, but the wall thickness t is changed to 0.9 mm. The axial and radial compressive strength are improved, but the surface area is reduced, resulting in a higher surface temperature compared to Example 1 and Example 2. When the wall thickness is further increased to 1.05 mm in Example 6, the axial and radial compressive strength are further improved, but the surface area is reduced, resulting in an increase in surface temperature and a significant decrease in heat dissipation performance, which does not meet the heat dissipation function.

[0041] In Examples 7 and 8, with a wall thickness of 0.75 mm, the side lengths of the regular hexagonal compartments are 1.45 mm and 1.74 mm, respectively. At these dimensions, the radial and axial compressive strengths are high, meeting the usage requirements, and the heat dissipation performance is good, achieving the heat dissipation purpose. When the side length L of the regular hexagonal compartment is 1.16 mm (Example 9), both the radial and axial compressive strengths increase, and the surface area increases, resulting in better heat dissipation. Although the compressive strength and heat dissipation performance of 0.87 mm in Example 10 meet the production requirements, it cannot be used due to potential blockage issues. When the wall thickness of the regular hexagonal compartment remains unchanged, increasing the side length L of the regular hexagonal deformation to 2.03 mm (Example 11) satisfies the working conditions for both radial and axial compressive strengths of the triangular block. When the side length L of the regular hexagonal compartment increases to 2.32 mm (Example 12), the compressive strength decreases significantly, and the heat dissipation performance is low, failing to meet the functional requirements.

[0042] Example 13 features a hexagonal compartment with a side opening. It has very high radial compressive strength and excessively high axial compressive strength, exceeding the equipment's upper limit. While the strength requirement is met, the surface area is small and heat dissipation performance is poor. Example 14 features a hexagonal compartment with a front opening along the needle groove. Similarly, it has very high radial compressive strength and axial compressive strength exceeding the upper limit, meeting the strength requirement. However, the number of openings is small, resulting in poor heat dissipation performance.

[0043] Example 15 is a circular compartment with a radius R = 1 mm and a wall thickness t = 0.75 mm. At this size, the radial compressive strength of the honeycomb triangular blocks is very high, and due to its large surface area, its heat dissipation is good. However, the honeycomb pores at this size are small, which can lead to clogging during actual use; therefore, this size cannot be used. Example 16 is a circular compartment with a radius R = 2 mm and a wall thickness t = 0.75 mm. At this shape and size, the radial compressive strength of the honeycomb triangular blocks is very low, not meeting the requirements of actual working conditions. Example 17 is a circular compartment with a radius R = 2.5 mm and a wall thickness t = 1.05 mm. At this shape and size, the radial compressive strength of the honeycomb triangular blocks is also very low, not meeting the requirements of actual working conditions. Example 18 is a circular compartment with a side opening. Its radial compressive strength is very high, but its axial compressive strength is excessively high, exceeding the equipment's upper limit. While the strength meets the requirements, the surface area is small, and its heat dissipation performance is very poor. Example 19 features a circular compartment with a groove along the front side. It exhibits high radial compressive strength and exceeds the upper limit of axial compressive strength, meeting the strength requirements. However, the number of openings is limited, resulting in poor heat dissipation. Circular compartments generally have very low radial compressive strength, which cannot meet the requirements of actual working conditions and therefore cannot be used.

[0044] In summary, the preferred solution is to open a regular hexagonal compartment on the front, and the dimensions of the regular hexagonal compartment are: 1.16mm≤L≤2.03mm, and the wall thickness between compartments, between compartments and positioning holes, and between compartments and needle grooves is 0.45mm≤t≤0.9mm.

[0045] The foregoing description describes embodiments of this patent. The scope of protection of this application is not limited to these specific embodiments, but is determined by the claims of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the technical concept and principles of this application should be included within the scope of protection of this application.

Claims

1. A triangular block for a knitting machine, comprising a working groove and a positioning hole disposed on the body of the triangular block, characterized in that... A honeycomb-shaped compartment is provided on the triangular block body. The compartments penetrate the top and bottom surfaces of the triangular block body. The compartments are distributed on both sides of the working groove and around the positioning hole. A certain wall thickness t is reserved between the compartments, between the compartments and the positioning hole, and between the compartments and the needle groove, and 0.45mm≤t≤0.9mm.

2. The triangular block for a knitting machine according to claim 1, characterized in that... The compartment on the top surface of the triangular block is a regular hexagon.

3. The triangular block for a knitting machine according to claim 2, characterized in that... The side length L of the regular hexagonal compartment is 1.16mm≤L≤2.03mm.

4. The triangular block for a knitting machine according to claim 3, characterized in that... The side length L of the further regular hexagon is 1.45mm ≤ L ≤ 1.74mm.

5. The triangular block for a knitting machine according to claim 4, characterized in that... L=1.595mm, t=0.6mm.

6. The triangular block for a knitting machine according to claim 1, characterized in that... The triangular blocks used in the knitting machine are injection molded from metal powder.

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