Encoder cable and enameled wire extrusion mold thereof

Abstract

The invention relates to an encoder cable and an enameled wire extrusion mold thereof. The encoder cable comprises a cable core, and a belting layer, a shielding layer and an outer protection layer which are sequentially coated outside the cable core, wherein the cable core comprises a plurality of conductors, each conductor is coated with a composite layer enamelled wire, the composite layer enamelled wire is prepared from polyester imide and polyamide imide, the composite layer enamelled wire is extruded and coated outside the conductor through an extrusion molding die, two adjacent conductors are twisted to form a two-core encoder wire core, and the two-core encoder wire core is wrapped by a composite layer enamelled wire. The cable core is composed of a plurality of groups of encoder wire cores; the extrusion mold is used for preparing and forming the composite layer enameled wire. The conductor is coated with the composite layer enameled wire made of the special material, so that the cable has the characteristics of high temperature resistance and cold resistance, the service life of the cable is prolonged, and the cable is suitable for various scenes.

Description

Technical Field

[0001] The invention relates to the technical field of cable preparation, in particular to an encoder cable and an enameled wire extrusion die thereof. Background Art

[0002] Existing encoder cables have limited special properties and lack excellent heat resistance, cold resistance, radiation resistance, etc. In high-temperature application scenarios, the cables are subjected to long-term high-temperature shock and stress, causing the cable surface to crack or internal components to be damaged, affecting the normal transmission of power and signal transmission of the cables; similarly, long-term low-temperature shock will also cause cable cracking and internal components to be damaged; in high-radiation scenarios, it will aggravate the aging of ordinary cables and greatly reduce the service life of the cables, and at the same time require an increase in the number of maintenance and servicing. Summary of the invention

[0003] To this end, the technical problem to be solved by the present invention is to overcome the problem in the prior art that cables are easily affected by temperature, and a composite layer of enameled wire made of special materials is coated on the outside of the conductor to make the cable resistant to high temperature and cold, thereby improving the service life of the cable and making it suitable for various scenarios.

[0004] In order to solve the above technical problems, the present invention provides an encoder cable, comprising: a cable core and a tape layer, a shielding layer, and an outer sheath sequentially coated on the outside of the cable core;

[0005] Wherein: the cable core comprises: a plurality of conductors, each of which is coated with a composite layer of enameled wire, the composite layer of enameled wire is prepared from polyesterimide and polyamideimide, the composite layer of enameled wire is extruded into a tube through an extrusion die and coated on the outside of the conductor, two adjacent conductors are twisted to form a two-core encoder core, and the cable core is composed of multiple groups of encoder cores.

[0006] In one embodiment of the present invention, the tape layer is made of polyester fiber.

[0007] In one embodiment of the present invention, the shielding layer is a braided conductor.

[0008] In one embodiment of the present invention, the outer protective layer is made of modified polyurethane material.

[0009] In order to solve the above technical problems, the present invention also provides an extrusion die for the enameled wire in the encoder cable, which is used to prepare the composite layer enameled wire in the encoder cable according to any one of claims 1 to 4, comprising:

[0010] A mold core, wherein a through hole is provided inside the mold core for the cable core to pass through, and a connecting portion, an inner sleeve portion and an inner sizing portion are sequentially provided outside the mold core along the direction in which the cable core extends;

[0011] A mold sleeve is sleeved outside the mold core, an extrusion channel is formed between the mold sleeve and the mold core, and the mold sleeve has an outer sleeve connection portion corresponding to the position of the inner sleeve connection portion and an outer sizing portion corresponding to the position of the inner sizing portion;

[0012] Wherein: the inner sleeve connection part and the outer sleeve connection part are both conical structures, and the conical angles of the inner sleeve connection part and the outer sleeve connection part are both 40°.

[0013] In one embodiment of the present invention, the distance between the mold core and the mold sleeve is constant, and the distance between the mold core and the mold sleeve is 15 mm.

[0014] In one embodiment of the present invention, the connecting portion of the mold core is an inclined surface.

[0015] In one embodiment of the present invention, a first chamfer is provided at the outer end of the inner calibrating portion of the mold core.

[0016] In one embodiment of the present invention, a second chamfer is provided at the connecting end of the outer sleeve connecting portion of the mold sleeve.

[0017] In one embodiment of the present invention, the mold core and the mold sleeve are both made of tungsten steel.

[0018] The above technical solution of the present invention has the following advantages compared with the prior art:

[0019] The encoder cable described in the present invention has a composite enameled wire made of a mixture of polyesterimide and polyamideimide coated on the outside of the conductor. The composite enameled wire can not only reach the thermal grade of 200 in the general sense and withstand high temperature, but also has a certain cold resistance. Therefore, the cable can work stably for a long time at -200℃~300℃; the composite enameled wire made of a mixture of polyesterimide and polyamideimide also has good mechanical strength, paint film adhesion performance, excellent electrical and scratch resistance, chemical resistance, thermal stability and solvent resistance, so that the cable has high flexibility, cold resistance, high cold resistance, radiation resistance and other high-quality properties, which greatly improves the service life of the cable and is suitable for various scenarios.

[0020] The present invention also provides an extrusion die for the enameled wire in the encoder cable. Due to the material characteristics of polyesterimide and polyamideimide, it is difficult to successfully shape them using a general extrusion die. Therefore, when preparing the composite enameled wire, a special extrusion die is used. The extrusion die of the present invention is a tube extrusion die. Not only is the die core and the die sleeve respectively provided with an inner sleeve connection part and an outer sleeve connection part that can cooperate with each other, but also the inner sizing part and the outer sizing part are respectively extended on the die core and the die sleeve to form an inner sizing part, so as to directly extrude a tubular structure to be sleeved on the outside of the conductor, rather than being extruded and coated on the outside of the conductor. This can reduce the extrusion pressure to ensure the molding of the composite enameled wire; and, in order to ensure the constancy of the extrusion pressure, the present invention further defines that both the inner sleeve connection part and the outer sleeve connection part are conical structures, and the conical angles of the inner sleeve connection part and the outer sleeve connection part are both 40°, which can ensure the constancy of the extrusion pressure, thereby achieving the shaping of the special material mixed with polyesterimide and polyamideimide. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein:

[0022] Figure 1 It is a structural schematic diagram of the encoder cable of the present invention;

[0023] Figure 2 It is a structural schematic diagram of a core of an extrusion die of the present invention;

[0024] Figure 3 It is a structural schematic diagram of the mold sleeve of the extrusion mold of the present invention.

[0025] Description of the reference numerals in the specification: 1. Cable core; 11. Conductor; 12. Composite enameled wire; 2. Tape layer; 3. Shielding layer; 4. Outer sheath. 100. Core; 101. Connecting part; 102. Inner sleeve connection part; 103. Inner sizing part; 104. First chamfer; 200. Sleeve; 201. Outer sleeve connection part; 202. Outer sizing part; 203. Second chamfer. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0027] Example 1

[0028] Reference Figure 1As shown, the present invention discloses an encoder cable, comprising: a cable core 1 and a tape layer 2, a shielding layer 3, and an outer sheath 4 sequentially coated on the outside of the cable core 1; wherein: the cable core 1 comprises: a plurality of conductors 11, in the cable core 1, two adjacent conductors 11 are twisted to form a two-core encoder wire core, and according to actual use requirements, the cable core 1 is composed of multiple groups of encoder wire cores;

[0029] Specifically, each of the conductors 11 is coated with a composite enameled wire 12, and the composite enameled wire 12 is prepared from polyesterimide and polyamideimide. The composite enameled wire 12 made of a mixture of polyesterimide and polyamideimide can not only reach the general thermal grade of 200 and withstand high temperatures, but also has a certain degree of cold resistance. Therefore, the cable can work stably for a long time at -200°C to 300°C; the composite enameled wire 12 made of a mixture of polyesterimide and polyamideimide also has good mechanical strength, paint film adhesion performance, excellent electrical resistance, scratch resistance, chemical resistance, thermal stability and solvent resistance, so that the cable has high flexibility, cold resistance, high cold resistance, radiation resistance and other high-quality properties, greatly improving the service life of the cable and making it suitable for various scenarios.

[0030] Specifically, the composite enameled wire 12 is extruded through an extrusion die and wrapped around the conductor 11. The composite enameled wire 12 can be separated from the conductor 11. Under extreme environmental conditions, the axial deformation of the composite enameled wire 12 caused by temperature will not be transmitted to the conductor 11, thereby ensuring the normal operation of the conductor 11.

[0031] Specifically, the tape layer 2 is made of polyester fiber, and multiple groups of encoder wire cores in the cable core 1 can be wrapped together by the tape layer 2 to prevent the encoder wire cores from loosening. At the same time, the tape layer 2 made of polyester fiber has good chemical resistance, thermal stability and solvent resistance, and can be used in extreme environmental conditions;

[0032] Specifically, according to actual use requirements, the tape layer 2 can be wrapped longitudinally or wrapped around the cable core 1 to ensure that the tape layer 2 is completely wrapped around the cable core 1 .

[0033] Specifically, the shielding layer 3 is a braided conductor 11, which is formed by using metal instead of criss-cross weaving and has a good shielding effect.

[0034] Specifically, the outer protective layer 4 is made of modified polyurethane material, has good chemical resistance, thermal stability and solvent resistance, and can be used in extreme environmental conditions.

[0035] Example 2

[0036] On the basis of the above-mentioned embodiment 1, the present invention further discloses an extrusion die for preparing the composite layer enameled wire 12 in the encoder cable in the above-mentioned embodiment 1. As mentioned above, due to the material properties of polyesterimide and polyamideimide, it is difficult to successfully shape them using a general extrusion die. Based on the combination of theory and practice, the inventor has improved the existing extrusion die, which will be explained in conjunction with specific embodiments below.

[0037] Reference Figure 2 and Figure 3 As shown, the present invention discloses an extrusion die for preparing polyesterimide and polyamideimide mixed materials; the extrusion die comprises: a die core 100 and a die sleeve 200, wherein: the die core 100 is provided with a through hole for the cable core 1 to pass through, the die sleeve 200 is sleeved on the outside of the die core 100 for use in cooperation, and an extrusion channel is formed between the die sleeve 200 and the die core 100; wherein: the outside of the die core 100 is provided with a connecting portion 101, an inner sleeve connection portion 102 and an inner sizing portion 103 in sequence along the extending direction of the cable core 1; the die sleeve 200 has a through hole for passing through the inner sleeve connection portion 103; the inner sleeve connection portion 104 is provided with a through hole for passing through the inner sleeve connection portion 105; the inner sleeve connection portion 106 is provided with a through hole for passing through the inner sleeve connection portion 106; the inner sleeve connection portion 107 is provided with a through hole for passing through the inner sleeve connection portion 107; the inner sleeve connection portion 108 is provided with a through hole for passing through the inner sleeve connection portion 108; the inner sleeve connection portion 109 is provided with a through hole for passing through the inner sleeve connection portion 109; the inner sleeve connection portion 101 is provided with a through hole for passing through the inner sleeve connection portion 101; the inner sleeve connection portion 102 is provided with a through hole for passing through the inner sleeve connection portion 103; the inner sleeve connection portion 104 is provided with a through hole for passing through the inner sleeve connection portion 105; the inner sleeve connection portion 106 is provided with a through hole for passing through the inner sleeve connection portion 106; the inner sleeve connection portion 108 is provided with a through hole for passing through the inner sleeve connection portion 108; the inner sleeve connection portion 109 is provided with a through hole for passing through the inner sleeve connection portion 10 The outer sleeve connection part 201 corresponding to the position of the inner sleeve 102 and the outer sizing part 202 corresponding to the position of the inner sizing part 103; compared with the existing extrusion mold, the extrusion mold of the present invention not only sets the mold core 100 and the mold sleeve 200 respectively with the inner sleeve connection part 102 and the outer sleeve connection part 201 that can cooperate with each other, but also extends the inner sizing part 103 and the outer sizing part 202 on the mold core 100 and the mold sleeve 200 respectively, so as to directly extrude and form a tubular structure to be sleeved on the conductor 11, rather than being extruded and coated on the conductor 11, so that the extrusion pressure can be reduced to ensure the molding of the composite layer enameled wire 12;

[0038] Moreover, in the present embodiment, the inner sleeve portion 102 and the outer sleeve portion 201 are both tapered structures. Compared with the extrusion type die, the extrusion die of the present invention has an additional inner sizing portion 103 and an outer sizing portion 202. Therefore, when the tapered angle between the inner sleeve portion 102 and the outer sleeve portion 201 is too small, the overall length of the extrusion die will be increased, and the mold core 100 will be too far forward, resulting in rubber blockage, thereby generating excessive extrusion pressure and causing unstable extrusion; and when the tapered angle between the inner sleeve portion 102 and the outer sleeve portion 201 is too large, the extrusion die will be unstable. The pressure is too high, and the composite enameled wire 12 formed by extrusion is squeezed and covered on the outside of the conductor 11, and the tube extrusion effect cannot be achieved; therefore, in this embodiment, the conical angles of the inner sleeve portion 102 and the outer sleeve portion 201 are both limited to 40°. After experimental verification, at this angle, the adhesion force of the composite enameled wire 12 formed by extrusion on the conductor 11 is stable between 80±10N, which can ensure the constancy of the extrusion pressure, thereby achieving the shaping of the special mixed material of polyesterimide and polyamideimide. At the same time, under this adhesion, the conductor 11 and the composite enameled wire 12 can be separated.

[0039] Specifically, in this embodiment, in order to ensure the stability of the extruded tube, it is necessary to set the distance between the mold core 100 and the mold sleeve 200 to be constant, so as to ensure the consistent thickness of the composite layer enameled wire 12. Experimental verification shows that when the distance between the mold core 100 and the mold sleeve 200 is 15 mm, the extrusion effect is best, and the product adhesion, outer diameter stability, and product surface brightness and haze can all be stable.

[0040] Reference Figure 2 and Figure 3 As shown, in order to ensure that the material can stably pass through the extrusion channel between the mold core 100 and the mold sleeve 200, in this embodiment, the connecting portion 101 of the mold core 100 is set as an inclined surface, which is conducive to the flow of the material; and, the outer end of the inner sizing portion 103 of the mold core 100 is provided with a first chamfer 104, and the connecting end of the outer connecting portion 201 of the mold sleeve 200 is provided with a second chamfer 203, to ensure that the material can flow continuously when passing through the first chamfer 104 and the second chamfer 203, to prevent the material supply from being interrupted.

[0041] Specifically, in the present embodiment, the mold core 100 and the mold sleeve 200 are both made of tungsten steel. The mold made of tungsten steel has the characteristics of high hardness and high wear resistance, which can effectively reduce the wear rate of the mold, thereby improving production efficiency; and, the tungsten steel mold can produce high-precision, high-surface quality products, thereby improving product quality; the tungsten steel mold has extremely high hardness and corrosion resistance, a long service life, and can greatly reduce production costs.

[0042] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. An encoder cable, characterized in that: include: The cable core and the tape layer, the shielding layer and the outer sheath sequentially coated on the cable core; Wherein: the cable core comprises: a plurality of conductors, each of which is coated with a composite layer of enameled wire, the composite layer of enameled wire is prepared from polyesterimide and polyamideimide, the composite layer of enameled wire is extruded into a tube through an extrusion die and coated on the outside of the conductor, two adjacent conductors are twisted to form a two-core encoder core, and the cable core is composed of multiple groups of encoder cores.

2. The encoder cable according to claim 1, characterized in that: The wrapping layer is made of polyester fiber.

3. The encoder cable according to claim 1, characterized in that: The shielding layer is a braided conductor.

4. The encoder cable according to claim 1, characterized in that: The outer protective layer is made of modified polyurethane material.

5. An extrusion die for an enameled wire in an encoder cable, used for preparing the composite enameled wire in the encoder cable according to any one of claims 1 to 4, characterized in that: include: A mold core, wherein a through hole is provided inside the mold core for the cable core to pass through, and a connecting portion, an inner sleeve portion and an inner sizing portion are sequentially provided outside the mold core along the direction in which the cable core extends; A mold sleeve is sleeved outside the mold core, an extrusion channel is formed between the mold sleeve and the mold core, and the mold sleeve has an outer sleeve connection portion corresponding to the position of the inner sleeve connection portion and an outer sizing portion corresponding to the position of the inner sizing portion; Wherein: the inner sleeve connection part and the outer sleeve connection part are both conical structures, and the conical angles of the inner sleeve connection part and the outer sleeve connection part are both 40°.

6. The extrusion die for the enameled wire in the encoder cable according to claim 5, characterized in that: The distance between the mold core and the mold sleeve is constant, and the distance between the mold core and the mold sleeve is 15 mm.

7. The extrusion die for the enameled wire in the encoder cable according to claim 5, characterized in that: The connecting portion of the mold core is an inclined surface.

8. The extrusion die for the enameled wire in the encoder cable according to claim 5, characterized in that: The outer end of the inner calibrating portion of the mold core is provided with a first chamfer.

9. The extrusion die for the enameled wire in the encoder cable according to claim 5, characterized in that: A second chamfer is provided at the connecting end of the outer sleeve connecting portion of the mold sleeve.

10. The extrusion die for the enameled wire in the encoder cable according to claim 5, characterized in that: The mold core and the mold sleeve are both made of tungsten steel.

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