A process for improving the stitching strength of a connecting belt

Abstract

The present invention relates to a process for improving the sewing strength of a connecting belt, which comprises the following steps: setting two fixed points; fixing one end of the connecting belt between the two fixed points, and coiling the other end of the connecting belt around the two fixed points; for each layer that the connecting belt coils around the two fixed points, adding a counterweight to the other end of the connecting belt so that the tightness of each layer of the connecting belt is consistent; marking each layer of the connecting belt, with multiple marks on any layer of the connecting belt corresponding one by one and overlapping with multiple marks on the adjacent layer, and each overlapping area of the connecting belt forms a mark group, and sewing each mark group of the connecting belt; solving the problem that the existing sewing process is difficult to make the impact resistance of the connecting belt meet the requirements of aerospace.

Description

Technical Field

[0001] The present invention relates to the field of aerospace technology, and in particular to a process for improving the sewing strength of connecting belts. Background Art

[0002] At present, the sewing of connecting belts is carried out in a natural state. According to the theoretical strength of the required connecting belt, the number of turns required for a belt of a certain strength is obtained by multiplying by a coefficient, and then it is coiled into a circular ring and sewn and fixed. Finally, looped ends are formed at both ends, and the middle is sewn and fixed by a double-needle machine.

[0003] However, when the connecting belt is applied to aerospace (such as the connecting belt of a speed reduction parachute used when an aircraft stalls), higher requirements are imposed on the impact resistance performance of the connecting belt. The existing sewing process is difficult to enable the connecting belt to meet the above requirements. Specifically:

[0004] 1. Since the connecting belt has a bent structure, there must be a difference in the lengths of the inner and outer layers of the belt;

[0005] 2. The connecting belt has natural elasticity, and the tightness degrees at different layers of the connecting belt are different;

[0006] 3. Since the presser foot of the sewing machine is a flat foot, it is easy to push and press the topmost layer during sewing, resulting in different lengths of each layer of the connecting belt;

[0007] 4. The connecting belt has a relatively large number of main body layers, and ordinary double-needle machine sewing cannot meet the high-strength application of the connecting belt. Summary of the Invention

[0008] In view of this, it is necessary to provide a process for improving the sewing strength of connecting belts to solve the problem that the existing sewing process is difficult to enable the impact resistance performance of the connecting belt to meet the requirements of aerospace.

[0009] The present invention provides a process for improving the sewing strength of connecting belts, including the following steps:

[0010] Set two fixed points;

[0011] One end of the connecting belt is fixed between the two fixed points, and the other end of the connecting belt is coiled around the two fixed points;

[0012] Each time the connecting belt coils around the two fixed points for one layer, a counterweight is provided at the other end of the connecting belt to make the tightness degree of each layer of the connecting belt consistent;

[0013] Mark each layer of the connecting belt. Multiple marks on any one layer of the connecting belt correspond one-to-one and overlap with multiple marks on the adjacent layer. Each overlapping area of the connecting belt forms a mark group, and each mark group of the connecting belt is sewn.

[0014] Furthermore, the distance on the opposite side of the two fixed points is equal to the maximum size of the inner circle when the finished connecting belt is formed and used.

[0015] Furthermore, one end of the connecting belt is fixed below the two fixed points, and the other end of the connecting belt is wound around the two fixed points in a clockwise or counterclockwise direction.

[0016] Furthermore, for each layer that the connecting belt winds around the two fixed points, after the other end of the connecting belt bypasses one of the fixed points, it adheres to the outer wall of the other fixed point in a vertically downward direction.

[0017] Furthermore, the other end of the connecting belt is weighted. After the other end of the connecting belt bypasses one of the fixed points, it adheres to the outer wall of the other fixed point in a vertically downward direction and is connected to a weight. Among them, the weights of the weights for each weighting are equal.

[0018] Furthermore, the marking is made by drawing a line along the width direction of the connecting belt with a marker pen.

[0019] Furthermore, the distance between multiple markings in each layer of the connecting belt is 50 mm.

[0020] Furthermore, no markings are provided within 10 mm of the vertical center line of the connecting belt.

[0021] Furthermore, no wire is routed on both sides of the belt loop where the connecting belt is close to the fixed point.

[0022] Furthermore, after each marking group of the connecting belt is stitched, the two ends of the connecting belt and the overlapping part between the two ends of the connecting belt are stitched.

[0023] Compared with the prior art, by setting two fixed points, one end of the connecting belt is fixed between the two fixed points, and the other end of the connecting belt is wound around the two fixed points to simulate the stress environment of the connecting belt, so as to ensure that each layer of the connecting belt is stressed synchronously. For each layer that the connecting belt winds around the two fixed points, the other end of the connecting belt is weighted to make the tightness of each layer of the connecting belt consistent. On the premise that the tightness of each layer of the connecting belt is consistent, markings are made on each layer of the connecting belt. The multiple markings on any layer of the connecting belt correspond one by one and overlap with the multiple markings on the adjacent layer. Each overlapping area of the connecting belt forms a marking group. Each marking group of the connecting belt is stitched. It can be stitched point-to-point along the marking group without squeezing the inner and outer layers of the connecting belt. The connecting belt stitched by this process can be evenly stressed during use, better transmit force, and has better impact resistance, and is suitable for high-strength working environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1Process flow chart of the process for improving the stitching strength of the connecting belt provided by the embodiment of the present invention;

[0025] Figure 2 Schematic diagram of the working of the coiling counterweight of the connecting belt in the process for improving the stitching strength of the connecting belt provided by the embodiment of the present invention;

[0026] Figure 3 Schematic diagram of the working of the marked stitching of the connecting belt in the process for improving the stitching strength of the connecting belt provided by the embodiment of the present invention. Detailed implementation manners

[0027] The following will specifically describe the preferred embodiments of the present invention in conjunction with the accompanying drawings. The accompanying drawings form a part of this application and are used together with the embodiments of the present invention to explain the principle of the present invention, rather than to limit the scope of the present invention.

[0028] As Figures 1-3 shown, a process for improving the stitching strength of a connecting belt provided by the present invention includes the following steps:

[0029] S100. Set two fixed points;

[0030] S200. One end of the connecting belt is fixed between the two fixed points, and the other end of the connecting belt is coiled around the two fixed points;

[0031] S300. For each layer that the connecting belt coils around the two fixed points, the other end of the connecting belt is counterweighted so that the tightness of each layer of the connecting belt is consistent;

[0032] S400. Mark each layer of the connecting belt. A plurality of marks on any layer of the connecting belt correspond one by one and overlap with a plurality of marks on the adjacent layer. Each overlapping area of the connecting belt forms a mark group, and each mark group of the connecting belt is stitched.

[0033] During implementation, by setting two fixed points 100, one end of the connecting belt 200 is fixed between the two fixed points 100, and the other end of the connecting belt 200 is wound around the two fixed points 100 to simulate the stress environment of the connecting belt 200, so as to ensure that each layer of the connecting belt 200 is stressed synchronously. For each layer that the connecting belt 200 winds around the two fixed points 100, a counterweight is added to the other end of the connecting belt 200 to make the tightness of each layer of the connecting belt 200 consistent. On the premise that the tightness of each layer of the connecting belt 200 is consistent, markings 210 are made on each layer of the connecting belt 200. The multiple markings 210 on any layer of the connecting belt 200 correspond one by one and overlap with the multiple markings 210 on the adjacent layer. Each overlapping area of the connecting belt 200 forms a marking group 220, and each marking group 220 of the connecting belt 200 is stitched. It can be stitched point-to-point along the marking group 220 without pressing the inner and outer layers of the connecting belt 200. The connecting belt 200 stitched by this process can be evenly stressed during use, better transmit force, has better impact resistance performance, and is suitable for high-strength working environments.

[0034] It should be noted that the existing stitching method for the connecting belt is to directly stitch the connecting belt in its natural state, and only stitch the two end heads of the connecting belt and the overlapping area between the two end heads. The existing stitching method has the following drawbacks:

[0035] 1) When the connecting belt is working, the bent part of the connecting belt is deformed under stress, and the stress on its outer layer and inner layer is uneven, so that the connecting belt breaks from the outermost layer, and the number of turns of the connecting belt has a very limited impact on the overall strength of the connecting belt.

[0036] 2) The connecting belt has only one stitching point. When the connecting belt is working, the stitching point is stressed greatly and is prone to failure, affecting the overall strength of the connecting belt.

[0037] The stitching method of the connecting belt in this application is to stitch under the condition that the tightness of each layer of the connecting belt is consistent. After stitching, when the connecting belt is working, the external force borne by each layer of the connecting belt is equal. Specifically, when the connecting belt is wound between two fixed points, the forming lengths of its inner and outer layers are similar to the actual stress form, providing a larger bearing range for the inner and outer layers to bear the force together. Therefore, compared with the traditional connecting belt, it can bear a greater load and has greater overall strength. At the same time, by making serrations on both sides of the end head, multiple serration stitching points evenly distribute the external force borne by the whole connecting belt to ensure the effective force bearing of the connecting belt.

[0038] In step S100, the distance on the opposite side of the two fixed points 100 is equal to the maximum size of the inner circle when the finished connecting belt 200 is formed, so as to effectively simulate the stress environment of the connecting belt 200. Among them, the finished connecting belt 200 is the structure of the finally sewn connecting belt 200 designed. The actual use length of the connecting belt 200 can be known in advance according to the design requirements, so that the distance between the two fixed points 100 can be obtained.

[0039] In step S200, one end of the connecting belt 200 is fixed below the two fixed points 100, and the other end of the connecting belt 200 is wound around the two fixed points 100 in a clockwise or counterclockwise direction.

[0040] In step S200, every time the connecting belt 200 is wound around the two fixed points 100 for one layer, the other end of the connecting belt 200 is pasted on the outer wall of the other fixed point 100 in the vertical downward direction after passing around one of the fixed points 100.

[0041] In step S300, in order to make the tightness of each layer of the connecting belt 200 consistent, the other end of the connecting belt 200 is weighted. The other end of the connecting belt 200 is pasted on the outer wall of the other fixed point 100 in the vertical downward direction after passing around one of the fixed points 100 and is connected to the weight 300. Among them, the weights of the weights 300 for each weighting are equal.

[0042] It should be noted that when winding the next layer, the weight 300 should be removed on the premise of tightening the conveyor belt, and then continue to wind the next layer.

[0043] In step S400, marks 210 are made on each layer of the connecting belt 200. The multiple marks 210 on any layer of the connecting belt 200 correspond one by one and overlap with the multiple marks 210 on the adjacent layer. Each overlapping area of the connecting belt 200 forms a mark group 220, and each mark group 220 of the connecting belt 200 is sewn. Among them, the parts of the connecting belt 200 where the marks 210 are required are all marked 210 in the same stress environment.

[0044] In one embodiment, the mark 210 is made by drawing a line along the width direction of the mark 210 tape with a marker pen. Of course, in other embodiments, other forms can also be used for marking 210 to provide suture position information for subsequent suturing. The specific method of marking 210 in the embodiments of the present invention is not limited.

[0045] In one embodiment, the distance between multiple marks 210 in each layer of the connecting belt 200 is 50 mm.

[0046] To ensure that the lengths of the inner and outer layers of the connecting belt 200 remain unchanged, no marks are provided within 10 mm of the vertical center line of the connecting belt. At the same time, no wire runs within 25 mm on both sides of the loop of the connecting belt 200 near the fixed point 100. Specifically, the central part of the connecting belt 200 is in contact with the fixed point 100, and the part of the connecting belt 200 near the fixed point 100 is in contact with the fixed point 100. The force differences at these two parts of the connecting belt 200 are relatively large, and the remaining part of the connecting belt 200 is subject to relatively uniform force. A mark 210 is made here, and the performance of the connecting belt 200 is better.

[0047] In one embodiment, after performing point-to-point corresponding stitching on each mark group 220 of the connecting belt 200, the two ends of the connecting belt 200 and the overlapping part between the two ends of the connecting belt 200 are stitched. Specifically, four rows of sawteeth with a length of 150 mm are made at positions 200 mm away from the fixed point on the connecting belt 200. There are 4 such positions in total. Then, the loop of the connecting belt 200 and the overlapping part between the two ends of the connecting belt 200 are stitched.

[0048] Compared with the prior art: By setting two fixed points, one end of the connecting belt is fixed between the two fixed points, and the other end of the connecting belt is wound around the two fixed points to simulate the force environment of the connecting belt, so as to ensure that each layer of the connecting belt is synchronously stressed. For each layer that the connecting belt winds around the two fixed points, a counterweight is added to the other end of the connecting belt to make the tightness of each layer of the connecting belt consistent. On the premise that the tightness of each layer of the connecting belt is consistent, marks are made on each layer of the connecting belt. The multiple marks on any layer of the connecting belt correspond one by one and overlap with the multiple marks on the adjacent layer. Each overlapping area of the connecting belt forms a mark group. Point-to-point stitching is performed on each mark group of the connecting belt without squeezing the inner and outer layers of the connecting belt. The connecting belt stitched by this process can be evenly stressed during use, better transmit force, and has better impact resistance performance, and is suitable for high-strength working environments.

[0049] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A process for improving the stitching strength of a connecting belt, characterized in that, Including the following steps: Set two fixed points; One end of the connecting belt is fixed between the two fixed points, and the other end of the connecting belt is coiled around the two fixed points; For each layer that the connecting belt coils around the two fixed points, the other end of the connecting belt is weighted so that the tightness of each layer of the connecting belt is consistent; Mark each layer of the connecting belt. Multiple marks on any layer of the connecting belt correspond one-to-one and overlap with multiple marks on the adjacent layer. Each overlapping area of the connecting belt forms a mark group, and each mark group of the connecting belt is sutured.

2. The process for improving the sewing strength of the connecting belt according to claim 1, characterized in that, The distance between the opposite sides of the two fixed points is equal to the maximum size of the inner circle when the finished connecting belt is formed for use.

3. The process for improving the sewing strength of the connecting belt according to claim 1, characterized in that, One end of the connecting belt is fixed below the two fixed points, and the other end of the connecting belt coils around the two fixed points in a clockwise or counterclockwise direction.

4. The process for improving the sewing strength of the connecting belt according to claim 3, characterized in that, For each layer that the connecting belt coils around the two fixed points, after the other end of the connecting belt bypasses one of the fixed points, it is attached to the outer wall of the other fixed point in a vertically downward direction.

5. The process for improving the stitching strength of the connecting belt according to claim 4, characterized in that, The other end of the connecting belt is weighted. After the other end of the connecting belt bypasses one of the fixed points, it is attached to the outer wall of the other fixed point in a vertically downward direction and is connected to a counterweight, where the weight of the counterweight for each weighting is equal.

6. The process for improving the sewing strength of the connecting belt according to claim 1, characterized in that, The mark is made by drawing a line along the width direction of the connecting belt with a marker pen.

7. The process for improving the sewing strength of the connecting belt according to claim 1, characterized in that The spacing between multiple marks in each layer of the connecting belt is 50 mm.

8. The process for improving the stitching strength of the connecting belt according to claim 1, characterized in that, No marks are provided within 10 mm of the vertical center line of the connecting belt.

9. The process for improving the sewing strength of the connecting belt according to claim 1, characterized in that, No wire is routed on both sides of the belt loop of the connecting belt close to the fixed point.

10. The process for improving the sewing strength of the connecting belt according to claim 1, characterized in that, After each mark group of the connecting belt is sutured, the two ends of the connecting belt and the overlapping part between the two ends of the connecting belt are sutured.

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