Metal sewing thread preparation device and method for sewing machine, sewing thread and special sewing machine

Abstract

The invention discloses a device and a method for preparing a metal sewing thread for a sewing machine, a sewing thread and a special sewing machine, designs a pure metal sewing thread formed by twisting and annealing seven superfine stainless steel monofilaments, adopts the special sewing machine, and can realize machine sewing; in the metal sewing thread preparation device, a whole set of sewing thread production equipment is designed, the phenomenon of thread breakage in the production process can be effectively reduced, and meanwhile the flexibility of the sewing thread is improved through annealing equipment. A special metal sewing thread guide device is designed on the sewing machine for the metal sewing thread, so that the special metal sewing thread guide device can be matched with the up-and-down moving stroke of the sewing thread, and automatic sewing of the metal sewing thread is achieved. According to the design, not only are the flexibility and strength optimization of the metal sewing thread achieved, but also automatic sewing of the pure metal sewing thread on a sewing machine is achieved.

Description

Technical Field

[0001] The invention relates to sewing thread of high temperature resistant heat insulating material, in particular to a preparation device and method of metal sewing thread for sewing machine, sewing thread and a special sewing machine. Background Art

[0002] Multilayer thermal insulation materials are the outer thermal protection materials of special precision instruments and aerospace devices. They are usually multilayer materials composed of metal films, high-temperature resistant fabrics, mesh materials, etc., and metal wires need to be used to sew between material layers. However, currently only metal monofilaments can be used for manual sewing, because metal monofilaments are very rigid, not soft enough, and easily deformed plastically, making it difficult for machines to route wires, and machines cannot be used for automated sewing. Specifically, because ordinary metal wires are not soft enough, the metal first undergoes plastic deformation as it moves up and down with the sewing needle. The sewing machine causes the metal wire above to be unable to form a connection structure with the metal wire below the sewing machine in the red box in the figure above, resulting in inability to sew or skipping. Manual sewing has low precision, poor consistency, poor stability, and low efficiency. In addition, if the metal monofilament breaks, the entire suture line will be pulled out, resulting in the overall failure of the suture effect, which is very risky.

[0003] Regarding metal sewing threads for multi-layer materials, patent CN 203451722 U discloses a conductive sewing thread, which is twisted from metal fibers and polyester fibers. However, this sewing thread contains polyester organic fibers and is difficult to withstand temperatures above 700°C. Patent CN 118127718 A discloses an automated washing label production device and method, mentioning a method of using organic sewing threads to embed and sew metal fiber sewing threads. This method actually uses ordinary sewing threads to bundle metal fibers, and does not truly achieve multi-layer sewing of metal sewing threads. It is also not resistant to high temperatures, and the carbonization of organic fibers under high temperature conditions causes a thermal conductive gap to form at the pinhole. Therefore, the problem of automated sewing of stainless steel metal wires used for multi-layer thermal insulation materials still exists. Summary of the invention

[0004] The purpose of the present invention is to overcome the technical bottleneck in the prior art that multi-layer thermal insulation materials cannot be sewn by machine using metal sewing thread, and to provide a metal sewing thread preparation device, method, sewing thread and special sewing machine for sewing machines for realizing automatic machine sewing of multi-layer thermal insulation materials.

[0005] To achieve the above objectives, the technical solution of the present invention is: In the first aspect, the present invention provides a metal sewing thread for ultra-high temperature resistant ultra-fine sewing machines, wherein the metal sewing thread is formed by twisting six outer metal wires around a core metal wire; the core metal wire has the same diameter as the outer metal wire, and the diameter of the metal sewing thread for sewing machines is 0.12 mm-0.27 mm, and the twist is 1300 twists / m-3000 twists / m.

[0006] The core metal wire has a diameter of 0.04 mm to 0.09 mm and is made of stainless steel metal monofilament.

[0007] The core metal wire and the outer metal wire are both made of 304, 316 or 316L stainless steel.

[0008] In a second aspect, the present invention provides a device for preparing a metal sewing thread for a sewing machine, comprising: a plurality of wire feeding devices for winding metal wire for making metal sewing thread; A tension control device, used for introducing the metal wire on the metal wire feeding device and providing resistance to tension the metal wire, and arranged corresponding to the metal wire feeding device; A twisting device, used to wind and twist a plurality of metal wires around a core metal wire to form a metal wire; A straightening device, used for straightening the metal wire; A high temperature annealing device, used to heat the straightened metal wire; A guide pulley is used to guide the metal wire and the heated metal wire; The winding device is used to wind and store the metal wire after heat treatment.

[0009] The wire feeding device comprises: A core wire feeding device for winding the core wire; A plurality of external metal wire feeding devices are used for winding the external metal wires. The external metal wire feeding devices are grouped in two so that two external metal wires are wound onto the core wire at the same time.

[0010] The straightening device comprises two rows of guide wheels which are arranged at intervals, upper and lower, and the angle a formed between three adjacent guide wheels is 30°-90°.

[0011] In a third aspect, the present invention provides a method for preparing ultra-high temperature resistant ultra-fine metal sewing thread for sewing machines, the preparation method is based on the aforementioned metal sewing thread preparation device for sewing machines, and the preparation method comprises the following steps: First, the core metal wire is led out through the tension control device and enters the twisting device; in the twisting device, the outer metal wires are led out through the tension control device and then wound around the outside of the core metal wire in groups of two. During the winding process, both the core metal wire and the outer metal wire are twisted, and the twist degree is 1300 twists / m to 3000 twists / m. After the winding is completed, the metal wire is obtained; Then, the metal wire is passed through a straightening device for straightening, and then enters a high-temperature annealing device for heating and annealing to make the temperature of the metal wire reach 200°C-300°C. After annealing, it is wound on a winding device for natural cooling to obtain a metal sewing thread.

[0012] In a fourth aspect, the present invention provides a sewing machine for ultra-high temperature resistant ultra-fine metal sewing thread, comprising: a metal sewing thread guide device, a rotary hook and a synchronous control device, the metal sewing thread guide device is used to fix and guide the aforementioned metal sewing thread, the metal sewing thread guide device is fixed on the sewing machine head, and the metal sewing thread guide device comprises: Metal sewing thread reel, used for orderly winding and storing metal sewing thread; Active reverse damping tension controller, used to fix the metal sewing thread coil and provide reverse damping tension to make the metal sewing thread straight; The sliding guide rod is used to limit the metal sewing thread. The sliding guide rod is fixed on the top of the sewing machine head. The angle b formed by the metal sewing thread at the sliding guide rod is 120°-165°; A top guide pulley is used to horizontally guide the metal sewing thread. The top guide pulley is fixed to the top of the sewing machine head. The bottom of the top guide pulley is slidably matched with the metal sewing thread. The yarn guide hole is used to change the direction of the metal sewing thread. The yarn guide hole is set above the sewing machine head; A directional pulley is used to vertically guide the metal sewing thread. The directional pulley is fixed in the middle of the sewing machine head; A sewing needle, used for passing a metal sewing thread through a needle hole thereon for sewing, wherein the diameter of the sewing needle is 1.4 mm to 2.2 mm; The presser foot is used to move up and down with the sewing needle to press the fabric to be sewn; The rotary shuttle is used to cooperate with the sewing needle to form a lock-stitch structure with two metal sewing threads; The synchronous control device is used to control the sewing needle, the presser foot and the rotary hook to sew synchronously.

[0013] In a fifth aspect, the present invention provides a multi-layer thermal insulation material sewing structure, comprising a multi-layer thermal insulation material, wherein the multi-layer thermal insulation material is sewn into shape on a sewing machine using the aforementioned metal sewing thread, The multi-layer heat-insulating material is composed of a high-temperature resistant metal film and a high-temperature resistant fabric; The high temperature resistant metal film is one of nickel foil, stainless steel foil and aluminum foil with a thickness of 0.05-0.2 mm; The high temperature resistant fabric is one of glass fiber fabric, quartz fiber fabric, basalt fiber fabric and alumina fiber fabric with a thickness of 0.1-0.3 mm. Compared with the prior art, the present invention has the following beneficial effects: 1. The twisting and annealing process in the preparation process of a metal sewing thread for a sewing machine of the present invention can effectively realize the elasticity and tension requirements of the metal sewing thread for machine automated sewing. Specifically, the twisting process increases the flexibility of the sewing thread, and further annealing can improve the plasticity of the metal wire, increase the elasticity of the metal wire, and avoid plastic deformation.

[0014] 2. In a metal sewing thread preparation device for a sewing machine of the present invention, the external metal wire feeding device has a structure in which two are wound in a group, which can effectively reduce the breakage of a single metal wire during the manufacturing process, and effectively overcome the problem that the strength of 0.04~0.09mm metal monofilaments is low and the wires are easily broken when twisted together. At the same time, twisting two by two in a group can reduce the length and floor space of the entire equipment; designing multiple guide pulleys is beneficial to reducing the friction generated by the metal during guidance, and further reducing the possibility of wire breakage; the angle a formed between the three adjacent guide wheels in the straightening device is 30°-90°, that is, it is not easy to short the wire, and the straightening effect is guaranteed. For the stainless steel metal wire of the present application, the straightening effect is poor if the straightening angle is too small, and the metal wire is easily broken if the straightening angle is too large.

[0015] 3. The present invention adopts an annealing process in the preparation method of metal sewing thread for sewing machines to improve the softness and tensile strength of stainless steel sewing thread, while taking into account the structure of the sewing thread with multiple metal wires wound and twisted, so that it can adapt to the upper and lower running trajectories of the sewing needle without producing plastic deformation.

[0016] 4. The present invention adopts an active reverse damping tension controller in cooperation with a subsequent guide structure in a sewing machine for metal sewing thread to form a metal sewing thread guide device, which ensures the smooth routing, pulling and withdrawal of the stainless steel ultra-fine metal sewing thread. In particular, the design of the active reverse damping tension controller can provide an upward pulling force for the metal sewing thread when the sewing needle is lifted, thereby maintaining the linear shape of the sewing thread and ensuring the formation of the lock-type suture structure.

[0017] 5. In a multi-layer heat-insulating material sewing structure of the present invention, stainless steel metal sewing thread is used to complete sewing through a sewing machine, and the sewing stitches are neat, the sewing holes are small, and the overall flatness is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of the metal sewing thread for sewing machine of the present invention.

[0019] Figure 2 It is a structural schematic diagram of a metal sewing thread preparation device for a sewing machine according to the present invention.

[0020] Figure 3 It is a schematic structural diagram of a sewing machine for metal sewing thread of the present invention.

[0021] Figure 4 yes Figure 3 A top view of the sliding guide rod 43.

[0022] Figure 5 It is a schematic diagram of a lock-stitched structure formed by sewing a multi-layer heat-insulating material sewing structure using a metal sewing thread with a sewing machine.

[0023] In the figure: metal sewing thread 1, core metal wire 11, external metal wire 12, multi-layer heat insulation material (2), high temperature resistant metal film (21), high temperature resistant fabric (22), metal wire feeding device 31, core metal wire feeding device 311, external metal wire feeding device 312, tension control device 32, twisting device 33, straightening device 34, guide wheel 341, high temperature annealing device 35, guide pulley 36, winding device 37, metal sewing thread guide device 4, metal sewing thread reel 41, active reverse damping tension controller 42, sliding guide rod 43, top guide pulley 44, yarn guide hole 45, directional pulley 46, sewing needle 47, presser foot (48), rotary shuttle (5), synchronous control device (6). DETAILED DESCRIPTION

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0025] Embodiment 1: See also Figure 1 A metal sewing thread for ultra-fine sewing machines resistant to ultra-high temperatures, wherein the metal sewing thread 1 is formed by twisting six outer metal wires 12 around a core metal wire 11; the core metal wire 11 has the same diameter as the outer metal wire 12, and the diameter of the metal sewing thread 1 for sewing machines is 0.12 mm-0.27 mm, and the twist is 1300 twists / m-3000 twists / m.

[0026] The core metal wire 11 has a diameter of 0.04 mm to 0.09 mm of stainless steel metal monofilament.

[0027] The core metal wire 11 and the outer metal wire 12 are both made of 304, 316 or 316L stainless steel.

[0028] For stainless steel metal monofilaments with a diameter of 0.04 mm-0.09 mm, the diameter is extremely thin, the strength is low and it is not resistant to friction. In ordinary sewing thread manufacturing equipment, there is a lot of friction between the yarn itself and the yarn and the machine. This application provides a production equipment that reduces friction through pulleys and twisting equipment: A device for preparing metal sewing thread for a sewing machine, comprising: A plurality of wire feeding devices 31 for winding metal wires for making metal sewing threads; A tension control device 32, used for introducing the metal wire on the metal wire feeding device 31 and providing resistance to tension the metal wire, and is arranged corresponding to the metal wire feeding device 31; A twisting device 33, used to wind and twist a plurality of metal wires around the core metal wire 11 to form a metal wire; A straightening device 34, used for straightening the metal wire; A high temperature annealing device 35, used for heating the straightened metal wire; A guide pulley 36 is used to guide the metal wire and the heated metal wire; The winding device 37 is used to wind and store the metal wire after the heat treatment.

[0029] The wire feeding device 31 comprises: A core wire feeding device 311, used for winding the core wire 11; A plurality of external metal wire feeding devices 312 are used for winding the external metal wires 12 . The external metal wire feeding devices 312 are grouped in two so that two external metal wires 12 are wound onto the core metal wire 11 at the same time.

[0030] The straightening device 34 comprises two rows of guide wheels 341 spaced apart from each other, and an angle a formed between three adjacent guide wheels is 30°-90°.

[0031] A method for preparing ultra-high temperature resistant ultra-fine metal sewing thread for sewing machines, the method is based on the aforementioned metal sewing thread preparation device for sewing machines, and the method comprises the following steps: First, the core metal wire 11 is led out through the tension control device 32 and enters the twisting device 33; in the twisting device 33, the outer metal wires 12 are led out through the tension control device 32 and then wound around the outside of the core metal wire 11 in groups of two. During the winding process, the core metal wire 11 and the outer metal wire 12 are twisted, and the twist degree is 1300 twists / m to 3000 twists / m. After the winding is completed, a metal wire is obtained; For the metal sewing thread 1 with a diameter of 0.12 mm-0.27 mm, the diameter is very thin, and such metal is prone to plastic deformation. The present application improves the toughness by wrapping and twisting multiple metal wires.

[0032] Then, the metal wire is passed through the straightening device 34 for straightening operation, and then enters the high-temperature annealing device 35 for heating annealing so that the temperature of the metal wire reaches 200°C-300°C. After annealing, it is wound on the winding device 37 for natural cooling to obtain the metal sewing thread 1.

[0033] In order to further improve the performance of stainless steel, the present application designs an annealing process to shape the stainless steel sewing thread and reduce the plasticity of the stainless steel sewing thread.

[0034] A sewing machine for ultra-high temperature resistant ultra-fine metal sewing thread, comprising: a metal sewing thread guide device (4), a rotary hook (5) and a synchronous control device (6), wherein the metal sewing thread guide device 4 is used to fix and guide the aforementioned metal sewing thread 1, and the metal sewing thread guide device 4 is fixed on the sewing machine head, and the metal sewing thread guide device 4 comprises: The metal sewing thread reel 41 is used for orderly winding and storing the metal sewing thread 1; An active reverse damping tension controller 42, used for fixing the metal sewing thread coil 41 and providing reverse damping tension to straighten the metal sewing thread 1; The sliding guide rod 43 is used to limit the metal sewing thread 1. The sliding guide rod 43 is fixed to the top of the sewing machine head. The angle b formed by the metal sewing thread 1 at the sliding guide rod 43 is 120°-165°; A top guide pulley 44 is used to horizontally guide the metal sewing thread 1. The top guide pulley 44 is fixed to the top of the sewing machine head, and the bottom of the top guide pulley 44 is slidably matched with the metal sewing thread 1; The yarn guide hole 45 is used to change the direction of the metal sewing thread 1, and the yarn guide hole 45 is arranged above the sewing machine head; A directional pulley 46 is used to vertically guide the metal sewing thread 1, and the directional pulley 46 is fixed to the middle part of the sewing machine head; A sewing needle 47, used for passing the metal sewing thread 1 through the needle hole thereon for sewing, wherein the diameter of the sewing needle 47 is 1.4 mm -2.2 mm; The rotary hook 2 is used to cooperate with the sewing needle 47 to form a lock-stitch structure with two metal sewing threads 1.

[0035] A presser foot (48) is used to cooperate with the sewing needle (47) to move up and down to press the fabric to be sewn; The rotary shuttle (5) is used to cooperate with the sewing needle (47) to form a lock-stitch structure with two metal sewing threads (1); The synchronous control device (6) is used to control the sewing needle (47), the presser foot (48) and the rotary hook (5) to sew synchronously.

[0036] A multi-layer heat-insulating material sewing structure comprises a multi-layer heat-insulating material (2), wherein the multi-layer heat-insulating material (2) is sewn into shape on a sewing machine using a metal sewing thread (1). The multi-layer heat-insulating material (2) is composed of a high-temperature resistant metal film (21) and a high-temperature resistant fabric (22); The high temperature resistant metal film (21) is one of nickel foil, stainless steel foil and aluminum foil with a thickness of 0.05-0.2 mm; The high temperature resistant fabric (22) is one of glass fiber fabric, quartz fiber fabric, basalt fiber fabric and alumina fiber fabric with a thickness of 0.1-0.3 mm.

[0037] Embodiment 2: Embodiment 2 is substantially the same as Embodiment 1, except that: The metal sewing thread 1 is twisted and twisted by 7 stainless steel metal monofilaments of model 316L and diameter 0.07 mm. The structure of the metal sewing thread 1 is as shown in the attached figure. Figure 2 The prepared metal sewing thread has a twist of 2669 twists / m and a diameter of 0.21 mm.

[0038] The high temperature annealing treatment temperature is 260°C.

[0039] The prepared high temperature resistant ultra-fine metal sewing thread 1 has high temperature resistance and corrosion resistance, and a tensile strength of 83N.

[0040] The high temperature resistant metal film and the high temperature resistant fabric form a multi-layer insulation material. The ultra-fine stainless steel metal wire is installed on the metal sewing thread guide device 4 to sew the multi-layer insulation material. The sewing machine is turned on to make the presser foot, sewing needle 47, and rotary shuttle 2 move synchronously and coordinately to ensure the automatic sewing of the ultra-fine stainless steel metal sewing thread 1 to form a lock-type suture structure. The suture stitch length is 13mm and the sewing speed is 150 rpm.

[0041] The active reverse damping tension controller 42 is provided with an active reverse damping motor to adjust the damping tension.

[0042] The automatic stitching stitches of the ultra-fine stainless steel metal sewing thread 1 on the multi-layer thermal insulation material are uniform, clear and regular. The prepared multi-layer stitched fabric has good integrity and heat radiation resistance and can withstand high temperatures of 800°C.

[0043] The high temperature resistant metal film is a nickel foil with a thickness of 0.1 mm.

[0044] The high temperature resistant fabric is an aluminum oxide fiber fabric with a thickness of 0.13 mm.

[0045] Embodiment 3: Embodiment 3 is substantially the same as Embodiment 2, except that: The twist of the prepared metal sewing thread 1 is 1358 twists / m. The automatic sewing stitching stitch length of the ultra-fine stainless steel metal sewing thread 1 is 10 mm, and the sewing speed is 100 revolutions / minute.

[0046] The prepared high temperature resistant ultra-fine stainless steel metal sewing thread 1 is softer than that of Example 2, and has a tensile strength of 69 N. The ultra-fine stainless steel metal wire used for automatic sewing of multi-layer thermal insulation materials has uniform, clear and regular stitches, and the sewing stitch length is smaller than that of Example 2.

[0047] Embodiment 4: Embodiment 4 is substantially the same as Embodiment 2, except that: The metal sewing thread 1 can be formed by twisting and twisting 7 stainless steel metal monofilaments with a model number of 304 and a diameter of 0.07 mm.

[0048] The high temperature resistant metal film is a nickel foil with a thickness of 0.08 mm.

[0049] The high temperature resistant fabric is a quartz fiber fabric with a thickness of 0.15 mm.

[0050] The prepared high temperature resistant ultra-fine stainless steel metal sewing thread 1 has high temperature resistance and a tensile strength of 86 N. The ultra-fine stainless steel metal sewing thread 1 used for multi-layer thermal insulation materials has neat and clear automatic stitching. The prepared multi-layer sewing fabric has good integrity, light weight, heat radiation resistance, and can withstand a high temperature of 700°C.

[0051] Embodiment 5: Embodiment 5 is substantially the same as Embodiment 2, except that: The metal sewing thread 1 can be formed by twisting and twisting 7 stainless steel metal monofilaments with a model number of 316L and a diameter of 0.06 mm.

[0052] The high temperature resistant metal film is a nickel foil with a thickness of 0.12 mm.

[0053] The high temperature resistant fabric is a basalt fiber fabric with a thickness of 0.12 mm.

[0054] The prepared high temperature resistant ultra-fine stainless steel metal sewing thread 1 has high temperature resistance and corrosion resistance, and the tensile strength is 72 N. The ultra-fine stainless steel metal sewing thread 1 used for multi-layer thermal insulation materials has neat and clear automatic stitching. The prepared multi-layer sewn fabric has good integrity, light weight, low cost, heat radiation resistance, and can withstand high temperatures of 600°C.

[0055] Embodiment 6: Embodiment 6 is substantially the same as Embodiment 4, except that: The high temperature resistant metal film is an aluminum foil with a thickness of 0.1 mm.

[0056] The high temperature resistant fabric is a glass fiber fabric with a thickness of 0.1 mm.

[0057] The prepared multi-layer stitched fabric has lighter weight and lower cost than that of Example 4, can withstand high temperatures of 200° C., and the automated stitching of ultra-fine stainless steel wires used for multi-layer thermal insulation materials has neat and clear stitches.

[0058] Although the present invention has been disclosed as above in the preferred embodiment, it is not intended to limit the present invention. Anyone familiar with this technology can make various changes and modifications without departing from the technology and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the definition of the claims.

Claims

1. A metal sewing thread for ultra-fine sewing machines resistant to ultra-high temperatures, characterized in that: The metal sewing thread (1) is formed by twisting six outer metal wires (12) around a core metal wire (11); the core metal wire (11) and the outer metal wire (12) have the same diameter, and the diameter of the metal sewing thread (1) for sewing machines is 0.12 mm-0.27 mm, and the twist is 1300 twists / m-3000 twists / m.

2. The ultra-high temperature resistant ultra-fine metal sewing thread for sewing machines according to claim 1, characterized in that: The core metal wire (11) has a diameter of 0.04 mm to 0.09 mm and is a stainless steel metal monofilament.

3. The ultra-high temperature resistant ultra-fine metal sewing thread for sewing machines according to claim 1, characterized in that: The core metal wire (11) and the outer metal wire (12) are both made of 304, 316 or 316L stainless steel.

4. A device for preparing ultra-high temperature resistant ultra-fine sewing machine metal sewing thread according to claim 1, 2 or 3, characterized in that: The metal sewing thread preparation device (3) comprises: A plurality of metal wire feeding devices (31) for winding metal wires for making metal sewing threads; A tension control device (32), used for introducing the metal wire on the metal wire feeding device (31) and providing resistance to tension the metal wire, and arranged corresponding to the metal wire feeding device (31); A twisting device (33) for winding and twisting a plurality of metal wires around a core metal wire (11) to form a metal wire; A straightening device (34) for straightening the metal wire; A high temperature annealing device (35) is used to heat the straightened metal wire; A guide pulley (36) for guiding the metal wire and the heated metal wire; The winding device (37) is used for winding and storing the metal wire after the heat treatment.

5. The metal sewing thread preparation device for a sewing machine according to claim 4, characterized in that: The wire feeding device (31) comprises: A core wire feeding device (311) for winding the core wire (11); A plurality of external metal wire feeding devices (312) are used for winding the external metal wire (12), wherein the external metal wire feeding devices (312) are grouped in two so that two external metal wires (12) are wound onto the core metal wire (11) at the same time.

6. The metal sewing thread preparation device for a sewing machine according to claim 4, characterized in that: The straightening device (34) comprises two rows of guide wheels (341) arranged at intervals, upper and lower, and the angle a formed between three adjacent guide wheels is 30°-90°.

7. A method for preparing ultra-high temperature resistant ultra-fine metal sewing thread for sewing machines, characterized in that: The preparation method is based on the metal sewing thread preparation device according to claim 4, 5 or 6, and the preparation method comprises the following steps: First, the core metal wire (11) is led out through the tension control device (32) and enters the twisting device (33); in the twisting device (33), the outer metal wires (12) are led out through the tension control device (32) and then wound around the outside of the core metal wire (11) in groups of two. During the winding process, the core metal wire (11) and the outer metal wire (12) are twisted, and the twist degree is 1300 twists / m to 3000 twists / m. After the winding is completed, a metal wire is obtained; Then, the metal wire is passed through a straightening device (34) for straightening, and then enters a high-temperature annealing device (35) for heating and annealing so that the temperature of the metal wire reaches 200° C.-300° C. After annealing, it is wound on a winding device (37) for natural cooling to obtain a metal sewing thread (1).

8. A special sewing machine for ultra-high temperature resistant ultra-fine sewing machine metal sewing thread according to claim 1, 2 or 3, characterized in that: include: A metal sewing thread guide device (4), a rotary shuttle (5) and a synchronous control device (6), wherein the metal sewing thread guide device (4) is used to fix and guide the metal sewing thread (1), the metal sewing thread guide device (4) is fixed on the head of a sewing machine, and the metal sewing thread guide device (4) comprises: A metal sewing thread reel (41) for orderly winding and storing the metal sewing thread (1); An active reverse damping tension controller (42) is used to fix the metal sewing thread roll (41) and provide reverse damping tension to straighten the metal sewing thread (1); A sliding guide rod (43) is used to limit the position of the metal sewing thread (1), the sliding guide rod (43) is fixed to the top of the sewing machine head, and the angle b formed by the metal sewing thread (1) at the sliding guide rod (43) is 120°-165°; A top guide pulley (44) is used to horizontally guide the metal sewing thread (1), the top guide pulley (44) is fixed to the top of the sewing machine head, and the bottom of the top guide pulley (44) is slidably matched with the metal sewing thread (1); A yarn guide hole (45) is used to change the direction of the metal sewing thread (1), and the yarn guide hole (45) is arranged above the head of the sewing machine; A directional pulley (46) is used to vertically guide the metal sewing thread (1), and the directional pulley (46) is fixed to the middle part of the sewing machine head; A sewing needle (47), used for passing the metal sewing thread (1) through a needle hole thereon for sewing, wherein the diameter of the sewing needle (47) is 1.4 mm to 2.2 mm; A presser foot (48) is used to cooperate with the sewing needle (47) to move up and down to press the fabric to be sewn; The rotary shuttle (5) is used to cooperate with the sewing needle (47) to form a lock-stitch structure with two metal sewing threads (1); The synchronous control device (6) is used to control the sewing needle (47), the presser foot (48) and the rotary hook (5) to sew synchronously.

9. A multi-layer thermal insulation material sewing structure, characterized in that: The invention comprises a multi-layer heat-insulating material (2), wherein the multi-layer heat-insulating material (2) is sewn into shape on a sewing machine using the metal sewing thread (1) as claimed in any one of claims 1, 2 or 3. The multi-layer heat-insulating material (2) is composed of a high-temperature resistant metal film (21) and a high-temperature resistant fabric (22); The high temperature resistant metal film (21) is one of nickel foil, stainless steel foil and aluminum foil with a thickness of 0.05-0.2 mm; The high temperature resistant fabric (22) is one of glass fiber fabric, quartz fiber fabric, basalt fiber fabric and alumina fiber fabric with a thickness of 0.1-0.3 mm.

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