Constant-temperature power cable for servo system and preparation method of constant-temperature power cable

Abstract

The invention relates to the technical field of cables, and provides a constant-temperature power cable for a servo system and a preparation method thereof.The constant-temperature power cable comprises a supporting body, wire cores, an outer wrapping layer, a heat conduction layer, a limiting frame and a heating wire, the supporting body is of a star-shaped hollow structure, a plurality of first limiting grooves are formed in the circumferential face of the supporting body, and the wire cores are arranged in the first limiting grooves; the outer wrapping layer wraps the wire core and is provided with a strip-shaped groove, and a temperature sensing optical fiber is arranged in the strip-shaped groove; the heat conduction layer is made of a mesh material and is adhered with a heat conduction medium, and the heat conduction layer is wound on the outer wrapping layer; the limiting frame is provided with two second limiting grooves, and the limiting frame is arranged between the two wire cores; and the heating wire is arranged in the supporting body. According to the invention, through the arrangement of the support body and the limiting frame, the relative position stability of the plurality of wire cores can be ensured, the anti-extrusion capability of the cable is effectively improved, the support body is of a hollow structure and can be used for circulation of a cooling or heating medium, and the heating wire can heat the cable, so that the temperature adjustment of the cable is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and in particular to a constant temperature power cable for a servo system and a preparation method thereof. Background Art

[0002] The servo system is a high-precision working system. In order to ensure the normal operation of the servo system and prevent power outages, maintaining the constant temperature of the cable is an effective measure. This can reduce the aging rate of the cable, extend the service life of the cable, and ensure the stability of the servo system application.

[0003] The invention patent application with the existing authorization announcement number CN118280650B discloses a high-power constant temperature cable and its preparation method. The high-power constant temperature cable includes a cable core of a composite structure, and an isolation layer and a sheath layer coated on the outside of the cable core; the cable core is formed by twisting multiple power cores and at least one cooling tube with a hollow structure, and the twisted gap is filled with thermal conductive silicone grease in a full filling structure, and the thermal conductive silicone grease covers the cooling tube and each power core in the cross section, so that the outer wall of the cooling tube is connected to the outer wall of each power core.

[0004] As in the above technical solution, multiple power line cores and cooling tubes are arranged in the isolation layer, but because the gaps are filled with thermal grease, the anti-extrusion ability is poor; although the thermal grease has a certain viscosity, the power line cores and cooling tubes are still easy to deviate and slide when squeezed, especially the cooling tubes are made of silicone base tubes. Although an armor layer is provided, in order to allow the thermal grease to cover the silicone base tube, the armor layer is arranged in a spiral manner and has a gap for the thermal grease to pass through. Therefore, the anti-extrusion ability is not significant enough, and the cable is easily squeezed, which may affect the circulation of the cooling medium. Summary of the invention

[0005] In view of this, the present invention proposes a constant temperature power cable for a servo system with a stable structure and strong anti-extrusion ability and a preparation method thereof, so as to solve the problem that the existing cable has poor anti-extrusion ability and the circulation of the internal cooling medium is easily affected.

[0006] The technical solution of the present invention is achieved in this way:

[0007] In one aspect, the present invention provides a constant temperature power cable for a servo system, comprising a support body, a wire core, an outer sheath, a heat conducting layer, a limit frame and a heating wire, wherein:

[0008] The support body is a star-shaped hollow structure, and a plurality of first limiting grooves are provided on the peripheral surface of the support body, and a wire core is arranged in each first limiting groove;

[0009] The outer cladding is coated on the wire core, and a strip groove is opened on the outer cladding, and a temperature-sensitive optical fiber is arranged in the strip groove;

[0010] The heat-conducting layer is a mesh material and adhered with a heat-conducting medium, and the heat-conducting layer is wound on the outer covering layer and fits the first limiting groove;

[0011] The limiting frame is provided with two second limiting grooves, the limiting frame is arranged between the two wire cores, and is attached to the heat conducting layer through the second limiting grooves;

[0012] The heating wire is arranged in the supporting body.

[0013] On the basis of the above technical solution, preferably, the support body includes a medium pipe made of a rigid material and a heat conductor made of a flexible material, wherein:

[0014] The surface of the medium pipe is covered with a heat conductor, and the first limiting groove is arranged on the heat conductor;

[0015] The heat conductor has a supporting portion located between the two first limiting grooves, the supporting portion is a structure with wide ends and a thin middle, and the supporting portion supports the limiting frame;

[0016] A plurality of heating wires are arranged in the heat conductor, and the plurality of heating wires are arranged in a circular array based on the axis of the medium tube.

[0017] On the basis of the above technical solution, preferably, the heat conductor includes an outer body, a connecting body and an inner body of an integrated structure, wherein:

[0018] A plurality of through holes are provided on the surface of the medium tube;

[0019] The outer body is coated on the medium tube;

[0020] The connecting body passes through the through hole and is connected to the outer body;

[0021] The inner body is fitted to the inner wall of the medium pipe and is connected to the connecting body.

[0022] On the basis of the above technical solution, preferably, it further comprises a reflux pipe fitting, the reflux pipe fitting comprises an output pipe and a reflux pipe, the outer body is provided with a plurality of reflux cavities, and the plurality of reflux cavities are arranged in a circular array based on the axis of the medium pipe, wherein:

[0023] One end of the output pipe is inserted into the medium pipe, and the other end is a sealing structure;

[0024] A plurality of return pipes are arranged around the output pipe, one end of the return pipe is connected to the output pipe, and the other end is inserted into the return chamber;

[0025] The return pipe is wrapped by injection molding to form an integrated structure with the outer body.

[0026] On the basis of the above technical solution, preferably, the limiting frame includes an outer arc plate, two inner arc plates and two support plates, wherein:

[0027] Two inner arc plates are provided, and one end of the two inner arc plates is connected, and the other end of the two inner arc plates is respectively connected to one end of the outer arc plate;

[0028] The second limiting groove is arranged on the inner arc plate;

[0029] One end of each of the two support plates is connected to the outer arc plate, and the other end of each of the two support plates is connected to an inner arc plate;

[0030] A channel is formed between the two inner arc plates and the two supporting plates.

[0031] On the basis of the above technical solution, preferably, the outer arc plate protrudes in a direction away from the support body, the inner arc plate protrudes toward the outer arc plate, and the support plate protrudes toward the connection point between the outer arc plate and the inner arc plate;

[0032] The thickness of the supporting plate is smaller than the thickness of the inner arc plate, and the thickness of the inner arc plate is smaller than or equal to the thickness of the outer arc plate.

[0033] On the basis of the above technical solution, preferably, it further includes a winding layer, a plurality of limit frames are arranged in a circular array based on the axis of the support body, and the outer arc plates of the plurality of limit frames are connected to form a circular structure;

[0034] The winding layer is wrapped around the limiting frame in a spiral structure.

[0035] On the basis of the above technical solution, preferably, the groove depth of the strip groove is X, and the thickness of the outer cladding is less than 2X.

[0036] On the basis of the above technical solution, preferably, the limit frame is made of metal, or,

[0037] The limiting frame is made of a flexible material and is filled with a heat conducting medium.

[0038] On the other hand, the present invention provides a method for preparing the above-mentioned constant temperature power cable for the servo system, comprising the following steps:

[0039] S1, forming a support body by extrusion, the support body wraps the heating wire, and forming an outer covering layer on the surface of the wire core by extrusion;

[0040] S2. Arrange a temperature-sensitive optical fiber in the strip groove, coat a heat-conducting medium on the outer cladding, and adhere the heat-conducting layer to the heat-conducting medium;

[0041] S3, disposing the heat-conducting layer on the outer covering layer in a winding manner so that the heat-conducting medium fills the strip grooves;

[0042] S4. Arrange the limiting frame and press the heat-conducting layer tightly to make the outer layer, the heat-conducting layer, the limiting frame and the heat-conducting medium fit tightly;

[0043] S5. A functional layer is arranged outside the limit frame to fix multiple limit frames.

[0044] Compared with the prior art, the constant temperature power cable for servo system and the preparation method thereof of the present invention have the following advantages:

[0045] Beneficial effects:

[0046] (1) By setting a support body and a limiting frame, the support body can support the wire core by relying on the first limiting groove, and the limiting frame can position the wire core, which can ensure the relative position stability of multiple wire cores and effectively improve the anti-extrusion ability of the cable. At the same time, the support body is a hollow structure, which can be used for the circulation of cooling or heating medium to increase or decrease the temperature of the cable, and the heating wire can heat the cable alone to achieve temperature regulation of the cable;

[0047] (2) The wire core is coated with an outer sheath, and the heat conductive layer is coated with the outer sheath. Since the outer sheath is provided with strip grooves, and the heat conductive layer is made of a mesh material and adhered with a heat conductive medium, when the heat conductive layer is wound around the outer sheath, the heat conductive material can fill the strip grooves and fit tightly with the outer sheath and the limit frame, so that heat can be conducted between the support body, the wire core, the outer sheath and the limit frame, which is beneficial to improving the heat dissipation effect; (3) The support body is composed of a rigid medium tube and a flexible heat conductive body, so that the heat conductive body can be used to buffer the extrusion and prevent the cable from being damaged; at the same time, the rigid medium tube can prevent the support body from being excessively deformed, and can also ensure that the hollow flow channel does not deform, thereby avoiding affecting the circulation of the cooling medium;

[0048] (4) The heat conductor is composed of an outer body, a connector and an inner body, and the connector of the heat conductor passes through the medium tube and fits the inner wall of the medium tube with the inner body, so that the cooling or heating medium flows in line with the inner body, and the heat conductor directly contacts the medium, which can effectively improve the cooling or heating effect and will not affect the supporting effect of the medium tube; (5) The limit frame is composed of an outer arc plate, an inner arc plate and a support plate, wherein the inner arc plate contacts the heat conductive layer, the outer arc plate is used to contact the winding layer, and the support plate is used to support the outer arc plate and the inner arc plate, thereby effectively ensuring the stability of the limit frame structure to improve the anti-extrusion ability; at the same time, the limit frame is a hollow structure, which can be used for medium circulation or filling of heat conductive medium, thereby further improving the heat transfer efficiency;

[0049] (6) The outer body of the heat conductor is provided with a reflux cavity, and the reflux cavity is connected with the medium pipe by setting a reflux pipe fitting, so that the water flow can be dispersed, thereby improving the heat exchange efficiency and realizing the same-end input and output of the medium; at the same time, the reflux pipe fitting is integrated with the outer body of the heat conductor into an integrated structure by injection molding, which can ensure the stability of the structure and prevent the leakage of the cooling medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0051] Figure 1 A three-dimensional diagram of a constant temperature power cable for a servo system of the present invention;

[0052] Figure 2 It is an end view of the constant temperature power cable for the servo system of the present invention;

[0053] Figure 3 The internal structure diagram of the constant temperature power cable for the servo system of the present invention;

[0054] Figure 4 It is an end view of the limit frame of the constant temperature power cable for the servo system of the present invention;

[0055] Figure 5 A three-dimensional diagram of the core and outer sheath of the constant temperature power cable for the servo system of the present invention;

[0056] Figure 6 It is an exploded structural diagram of the support body of the constant temperature power cable for the servo system of the present invention;

[0057] Figure 7 The cross-sectional structure diagram of the support body of the constant temperature power cable for the servo system of the present invention;

[0058] Figure 8 It is an end view of another structure of the limit frame of the constant temperature power cable for the servo system of the present invention;

[0059] In the figure: 1. support body; 11. medium tube; 12. heat conductor; 121. outer body; 122. connector; 123. inner body; 124. abutment; 101. first limiting groove; 102. through hole; 103. reflux chamber; 2. core; 3. outer sheath; 301. strip groove; 4. heat conductive layer; 5. limiting frame; 51. outer arc plate; 52. inner arc plate; 53. support plate; 501. second limiting groove; 502. channel; 6. heating wire; 7. reflux pipe fitting; 71. output pipe; 72. reflux pipe; 8. winding layer. DETAILED DESCRIPTION

[0060] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0061] like Figures 1 to 8 As shown, the constant temperature power cable for servo system of the present invention comprises a support body 1, a core 2, an outer sheath 3, a heat conducting layer 4, a limit frame 5, a heating wire 6, a return pipe 7 and a winding layer 8. The cable structure is not only applicable to servo systems, but also to other cables.

[0062] like Figure 1 , Figure 3 , Figure 4 and Figure 6 As shown, the support body 1 is a star-shaped hollow structure, and a plurality of first limiting grooves 101 are provided on the circumference of the support body 1, and a core 2 is arranged in each first limiting groove 101; the outer cladding 3 is coated on the core 2, and the outer cladding 3 is provided with a strip groove 301, and a temperature-sensitive optical fiber is arranged in the strip groove 301; the heat-conducting layer 4 is a mesh material and adhered with a heat-conducting medium, and the heat-conducting layer 4 is wound on the outer cladding 3 and fits the first limiting groove 101;

[0063] As in the above structure, the support body 1 is made of heat-conducting material and forms a star-shaped structure by providing a plurality of first limiting grooves 101. The support body 1 can be formed by extrusion. The support body 1 is also configured as a hollow structure for circulating a cooling medium or a heating medium, thereby achieving temperature control of the cable.

[0064] After being covered by the outer covering layer 3, the wire core 2 is placed in the first limiting groove 101 to be limited by the first limiting groove 101;

[0065] In this structure, in order to ensure that the heat of the core 2 can be effectively transferred to the support body 1, a heat-conducting layer 4 is provided; the heat-conducting layer 4 is a mesh material and adhered with a heat-conducting medium, so that after the heat-conducting layer 4 is wound on the outer cladding 3, effective heat conduction can be achieved;

[0066] Specifically, the outer cladding 3 is provided with a strip groove 301 for accommodating a heat-conducting medium. After the heat-conducting layer 4 is wound around the outer cladding 3, the heat-conducting medium can be used to closely fit the outer cladding 3. The strip groove 301 increases the contact area between the outer cladding 3 and the heat-conducting medium, thereby ensuring heat conduction.

[0067] Specifically, the heat conducting medium may be silicone grease.

[0068] In this structure, in order to realize the temperature detection of the cable, a temperature-sensitive optical fiber is arranged in the strip groove 301, wherein the strip groove 301 can realize the limitation of the temperature-sensitive optical fiber. After the heat-conducting layer 4 is wound around the outer cladding 3, the temperature-sensitive optical fiber can be wrapped by the heat-conducting medium to ensure the accuracy of the detection. At the same time, relying on the winding of the heat-conducting layer 4, the position of the temperature-sensitive optical fiber can be effectively guaranteed to be stable to reduce vibration interference.

[0069] Specifically, the groove depth of the strip groove 301 is X, and the thickness of the outer cladding layer 3 is less than 2X;

[0070] As in the above structure, the strip groove 301 is used to accommodate the heat-conducting medium. At this time, the thickness of the outer cladding 3 is set to be less than twice the groove depth of the strip groove 301, which can increase the heat conduction speed of the outer cladding 3 so that the core 2 can quickly dissipate heat.

[0071] like Figures 2 to 4 As shown, the limiting frame 5 is provided with two second limiting grooves 501, the limiting frame 5 is arranged between the two wire cores 2, and is attached to the heat conducting layer 4 through the second limiting grooves 501; the heating wire 6 is arranged in the support body 1;

[0072] As in the above structure, after a part of the wire core 2 is supported by the support body 1, the side away from the support body 1 is limited by the limit frame 5;

[0073] When assembling the limiting frame 5, the limiting frame 5 is attached to the heat-conducting layer 4 wound on the outer covering layer 3 by the second limiting groove 501. At this time, the limiting frame 5 is not only used for structural reinforcement, but also used as a heat-conducting structure to accelerate the temperature adjustment of the cable;

[0074] Specifically, a heating wire 6 is further provided in the support body 1, so that the support body 1 is heated by the heating wire 6, and then the heat is conducted through the heat conductive layer 4, the outer covering layer 3 and the limiting frame 5, so as to realize the heating of the cable.

[0075] like Figure 6 As shown, the support body 1 includes a medium tube 11 made of a rigid material and a heat conductor 12 made of a flexible material, wherein the surface of the medium tube 11 is covered with the heat conductor 12, and a first limiting groove 101 is provided on the heat conductor 12;

[0076] As shown in the above structure, the support body is composed of two parts: a medium tube 11 and a heat conductor 12, wherein the medium tube 11 forms a hollow structure of the support body 1, which is used to circulate cooling or heating medium and realize heat exchange with the heat conductor 12, and then realize heat conduction with the heat conductive layer 4 through the part corresponding to the first limiting groove 101; this structure relies on the heat conductor 12 to achieve heat conduction and buffering effects, and also relies on the medium tube 11 to achieve structural support and medium circulation, and the rigid medium tube 11 can prevent deformation from affecting the circulation of cooling medium.

[0077] like Figure 2and Figure 6 As shown, the heat conductor 12 has a supporting portion 124 located between the two first limiting grooves 101, the supporting portion 124 is a structure with wide ends and thin in the middle, and the supporting portion 124 supports the limiting frame 5; a plurality of heating wires 6 are arranged in the heat conductor 12, and the plurality of heating wires 6 are arranged in a circular array with the axis of the medium tube 11 as a reference;

[0078] As described above, the heat conductor 12 forms a star-shaped structure having a supporting portion 124, which allows the supporting portion 124 to pass through the portion where the distance between two adjacent cores 2 is the smallest, that is, the middle position of the supporting portion 124 corresponds to the point where the distance between two adjacent cores 2 is the smallest, and the end of the supporting portion 124 is wider. This allows the limiting frame 5 to apply pressure to the supporting portion 124 of the heat conductor 12 when assembling the limiting frame 5, thereby making the heat conductor 12 fit more closely with the heat conductive layer 4, which is beneficial to ensuring the stability of the structure and allowing heat to be directly conducted between the heat conductor 12 and the limiting frame 5.

[0079] like Figure 6 and Figure 7 As shown, the heat conductor 12 includes an outer body 121, a connecting body 122 and an inner body 123 of an integrated structure, wherein a plurality of through holes 102 are opened on the surface of the medium tube 11; the outer body 121 is coated on the medium tube 11; the connecting body 122 passes through the through holes 102 and is connected to the outer body 121; the inner body 123 is attached to the inner wall of the medium tube 11 and is connected to the connecting body 122;

[0080] As described above, the heat conductor 12 is composed of an outer body 121, a connector 122 and an inner body 123, and when it is provided, it is provided as an integral structure by injection molding; the medium tube 11 is provided in the heat conductor 12, and a through hole 102 is provided on the medium tube 11. At this time, a columnar mold can be provided in the medium tube 11. When the outer body 121 is formed by injection molding on the outer side of the medium tube 11, the injection molding material will enter the medium tube 11 through the through hole 102 to contact the inner wall of the medium tube 11 and the outer wall of the columnar mold, thereby forming the connector 122 and the inner body 123, and then the columnar mold is removed to form a hollow flow channel;

[0081] With such a structure, the heat conductor 12 covers the medium tube 11. When the medium flows in the hollow flow channel, it will directly contact the inner body 123 of the heat conductor 12, thereby realizing direct thermal interaction between the medium and the heat conductor 12. This can reduce the influence of the medium tube 11 on heat conduction, thereby improving the heat conduction efficiency and ensuring that the cable has a faster heating or cooling rate. At the same time, it can ensure that the hollow flow channel does not deform, thereby avoiding affecting the circulation of the cooling medium.

[0082] like Figure 2As shown, the reflux pipe 7 includes an output pipe 71 and a reflux pipe 72, and the outer body 121 is provided with a plurality of reflux chambers 103, and the plurality of reflux chambers 103 are arranged in a circular array with the axis of the medium pipe 11 as a reference, wherein one end of the output pipe 71 is inserted into the medium pipe 11, and the other end is a sealing structure; a plurality of reflux pipes 72 are arranged around the output pipe 71, one end of the reflux pipe 72 is connected and penetrated with the output pipe 71, and the other end is inserted into the reflux chamber 103; the reflux pipe 7 is wrapped by injection molding to form an integrated structure with the outer body 121;

[0083] As in the above structure, one end of the output pipe 71 is inserted into the medium pipe 11. When assembled, it directly contacts the inner body 123. The output pipe 71 is tightly coupled with the inner body 123 by means of the reflux pipe 72. In this way, the heating or cooling medium flows through the support body 1 twice, ensuring a good temperature regulation effect. When the medium refluxes, it is divided through multiple reflux chambers 103, which can improve the heat exchange effect.

[0084] At the same time, this structure enables the cable to supply and output the medium through the same end, which reduces the risk of leakage and improves the convenience of assembly and maintenance;

[0085] Specifically, the return pipe 7 is wrapped by injection molding so as to be completely integrated into the outer body 121 of the support body 1 , which further improves the sealing efficiency and eliminates the risk of leakage of the return pipe 7 .

[0086] like Figure 4 As shown, the limiting frame 5 includes an outer arc plate 51, two inner arc plates 52 and two support plates 53, wherein two inner arc plates 52 are provided, and one end of the two inner arc plates 52 is connected, and the other end of the two inner arc plates 52 is respectively connected to one end of the outer arc plate 51; the second limiting groove 501 is provided on the inner arc plate 52; the two support plates 53 each have one end connected to the outer arc plate 51, and the other end of the two support plates 53 is respectively connected to one inner arc plate 52; a channel 502 is formed between the two inner arc plates 52 and the two support plates 53;

[0087] As in the above structure, the ends of the two inner arc plates 52 connected are used to abut the heat conductor 12 of the support body 1, and the inner arc plate 52 forms a second limiting groove 501 for contacting the heat conductive layer 4, so that the heat can be transferred to the limiting frame 5, and the heat is conducted through the limiting frame 5;

[0088] The outer arc plate 51 is connected to the two inner arc plates 52, and the support plate 53 is connected to the outer arc plate 51 and the inner arc plate 52, thereby ensuring the overall structural strength of the limit frame 5, thereby improving the overall anti-extrusion ability of the cable;

[0089] The two inner arc plates 52 and the two support plates 53 form a channel 502 , and there is also a channel between the outer arc plate 51 , the inner arc plate 52 and the support plate 53 , which enables the limit frame 5 to have a certain heat preservation ability and reduces the weight of the cable.

[0090] like Figure 4 As shown, the outer arc plate 51 protrudes in a direction away from the support body 1, the inner arc plate 52 protrudes toward the outer arc plate 51, and the support plate 53 protrudes toward the connection point between the outer arc plate 51 and the inner arc plate 52; the thickness of the support plate 53 is less than the thickness of the inner arc plate 52, and the thickness of the inner arc plate 52 is less than or equal to the thickness of the outer arc plate 51;

[0091] As in the above structure, the inner arc plate 52 is configured to be arc-shaped to fit the heat-conducting layer 4, and the outer arc plate 51 and the inner arc plate 52 are also configured to be arc-shaped structures to ensure structural strength, so as to improve the anti-extrusion ability, and when the channel 502 is used for medium circulation, the circulating medium can also be fully utilized to achieve the anti-extrusion effect, so as to ensure the stability of the application;

[0092] Among them, the thickness of the support plate 53 is the smallest, which can realize rapid heat exchange and ensure the heating and cooling rates; the thickness of the inner arc plate 52 is less than or equal to the thickness of the outer arc plate 51, so as to ensure the structural strength of the limit frame 5, and the thickness of the inner arc plate 52 can be appropriately reduced to improve the heat exchange effect with the heat conductive layer 4.

[0093] like Figure 8 As shown, another structure of the limit frame 5 is shown, in which the protrusion direction of the inner arc plate 52 is opposite;

[0094] In some embodiments, the inner arc plate 52 can be configured as a straight plate structure.

[0095] like Figure 4 As shown, the limiting frames 5 are provided in a circular array based on the axis of the support body 1, and the outer arc plates 51 of the plurality of limiting frames 5 are connected to form a circular structure; the winding layer 8 is wrapped around the limiting frame 5 in a spiral structure;

[0096] As in the above structure, after the plurality of limit frames 5 surround the support body 1, the plurality of outer arc plates 51 are connected to each other to form a circular structure, and then the plurality of limit frames 5 are fixed after the limit frames 5 are wound by the winding layer 8, and the limit frames 5 can be closely attached to the heat conductive layer 4 and the support body 1, thereby ensuring the stability of the structure and the heat conductive effect;

[0097] At the same time, since the outer arc plates 51 of the plurality of limiting frames 5 are connected to each other to form a ring, they have good structural strength, and the thickness of the inner arc plates 52 can be further reduced.

[0098] Specifically, the limit frame 5 is made of metal, or the limit frame 5 is made of flexible material and filled with a heat-conducting medium;

[0099] As described above, the limiting frame 5 of the present invention provides two structures. For shorter short-distance cables, a limiting frame 5 made of metal can be used. In this way, the limiting frame 5 has good structural strength and heat conduction performance.

[0100] For long-distance cable applications, the limit frame 5 can be made of a flexible material with a certain thermal conductivity and filled with a thermal conductive medium, or the limit frame 5 can be used for medium circulation to achieve cooling and heating. At the same time, relying on the support of the medium, it can also ensure that the cable has a certain anti-extrusion ability.

[0101] The method for preparing the constant temperature power cable for the servo system of the present invention comprises the following steps:

[0102] S1, forming a support body 1 by extrusion, the support body 1 wraps the heating wire 6, and forming an outer covering layer 3 on the surface of the wire core 2 by extrusion;

[0103] S2, laying a temperature-sensitive optical fiber in the strip groove 301, coating a heat-conducting medium on the outer cladding 3, and adhering the heat-conducting layer 4 to the heat-conducting medium;

[0104] S3, disposing the heat-conducting layer 4 on the outer covering layer 3 in a winding manner, so that the heat-conducting medium fills the strip grooves 301;

[0105] S4, arrange the limiting frame 5, and press the heat conducting layer 4, so that the outer covering layer 3, the heat conducting layer 4, the limiting frame 5 and the heat conducting medium are closely attached;

[0106] S5, arranging a functional layer outside the limiting frame 5 to fix the plurality of limiting frames 5;

[0107] Specifically, the winding layer 8 can be regarded as a functional layer, or a shielding layer, an insulating layer and other functional layers can be added. In situations where high strength is required, an armor layer can be added.

[0108] In some embodiments, during preparation, only the heat-conducting medium is adhered to the heat-conducting layer 4 , and then the outer covering layer 3 is wrapped around to fill the strip grooves 301 .

[0109] Specific implementation steps:

[0110] When used, the medium pipe 11 of the support body 1 is used for medium circulation. After the medium enters the output pipe 71 of the reflux pipe 7, it refluxes through the reflux pipe 72 and the reflux cavity 103. The medium can be a cooling medium or a heating medium. The heat is conducted between the heat conductor 12, the heat conductive layer 4, the outer sheath 3, the wire core 2 and the limit frame 5 to achieve the temperature increase or decrease of the cable.

[0111] The limiting frame 5 forms three flow channels including the channel 502 through the outer arc plate 51, the inner arc plate 52 and the support plate 53. According to application requirements, these flow channels can be used to fill heat-conducting medium, or circulate cooling or heating medium, so as to achieve temperature regulation of the cable.

[0112] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A constant temperature power cable for a servo system, characterized in that: It comprises a support body (1), a wire core (2), an outer covering layer (3), a heat conducting layer (4), a limiting frame (5) and a heating wire (6), wherein: The support body (1) is a star-shaped hollow structure, a plurality of first limiting grooves (101) are provided on the circumference of the support body (1), and the wire core (2) is arranged in each of the first limiting grooves (101); The outer cladding (3) is coated on the wire core (2), and the outer cladding (3) is provided with a strip groove (301), and a temperature-sensitive optical fiber is arranged in the strip groove (301); The heat-conducting layer (4) is a mesh material and is adhered with a heat-conducting medium; the heat-conducting layer (4) is wound on the outer covering layer (3) and fits the first limiting groove (101); The limiting frame (5) is provided with two second limiting grooves (501); the limiting frame (5) is arranged between the two wire cores (2) and is attached to the heat conducting layer (4) through the second limiting grooves (501); The heating wire (6) is arranged in the support body (1).

2. The constant temperature power cable for servo system according to claim 1, characterized in that: The support body (1) comprises a medium pipe (11) made of a rigid material and a heat conductor (12) made of a flexible material, wherein: The surface of the medium pipe (11) is covered with the heat conductor (12), and the first limiting groove (101) is provided on the heat conductor (12); The heat conductor (12) has a supporting portion (124) located between the two first limiting grooves (101), the supporting portion (124) is a structure with wide ends and a thin middle, and the supporting portion (124) supports the limiting frame (5); A plurality of the heating wires (6) are arranged in the heat conductor (12), and the plurality of the heating wires (6) are arranged in a circular array with the axis of the medium tube (11) as a reference.

3. The constant temperature power cable for servo system according to claim 2, characterized in that: The heat conductor (12) comprises an outer body (121), a connecting body (122) and an inner body (123) of an integrated structure, wherein: A plurality of through holes (102) are provided on the surface of the medium tube (11); The outer body (121) is coated on the medium pipe (11); The connecting body (122) passes through the through hole (102) and is connected to the outer body (121); The inner body (123) fits the inner wall of the medium pipe (11) and is connected to the connecting body (122).

4. The constant temperature power cable for servo system according to claim 3, characterized in that: It also includes a return pipe (7), the return pipe (7) including an output pipe (71) and a return pipe (72), the outer body (121) is provided with a plurality of return cavities (103), the plurality of return cavities (103) are arranged in a circular array with the axis of the medium pipe (11) as a reference, wherein: One end of the output pipe (71) is inserted into the medium pipe (11), and the other end is a sealing structure; A plurality of return pipes (72) are arranged around the output pipe (71); one end of the return pipe (72) is connected to and penetrates the output pipe (71), and the other end is inserted into the return chamber (103); The return pipe (7) is wrapped by injection molding to form an integrated structure with the outer body (121).

5. The constant temperature power cable for servo system according to claim 1, characterized in that: The limiting frame (5) comprises an outer arc plate (51), two inner arc plates (52) and two support plates (53), wherein: Two inner arc plates (52) are provided, and one end of the two inner arc plates (52) is connected to each other, and the other end of the two inner arc plates (52) is respectively connected to one end of the outer arc plate (51); The second limiting groove (501) is arranged on the inner arc plate (52); One end of each of the two support plates (53) is connected to the outer arc plate (51), and the other end of each of the two support plates (53) is connected to one of the inner arc plates (52); A channel (502) is formed between the two inner arc plates (52) and the two support plates (53).

6. The constant temperature power cable for servo system according to claim 5, characterized in that: The outer arc plate (51) protrudes in a direction away from the support body (1), the inner arc plate (52) protrudes toward the outer arc plate (51), and the support plate (53) protrudes toward the connection point between the outer arc plate (51) and the inner arc plate (52); The thickness of the support plate (53) is smaller than the thickness of the inner arc plate (52), and the thickness of the inner arc plate (52) is smaller than or equal to the thickness of the outer arc plate (51).

7. The constant temperature power cable for servo system according to claim 5, characterized in that: It also includes a winding layer (8), wherein a plurality of the limiting frames (5) are arranged in a circular array based on the axis of the support body (1), and the outer arc plates (51) of the plurality of limiting frames (5) are connected to form a circular structure; The winding layer (8) is wrapped around the limiting frame (5) in a spiral structure.

8. The constant temperature power cable for a servo system according to any one of claims 1 to 7, characterized in that: The groove depth of the strip groove (301) is X, and the thickness of the outer cladding layer (3) is less than 2X.

9. The constant temperature power cable for a servo system according to any one of claims 1 to 7, characterized in that: The limiting frame (5) is made of metal, or The limiting frame (5) is made of a flexible material and is filled with a heat-conducting medium.

10. A method for preparing a constant temperature power cable for a servo system as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: S1, forming the support body (1) by extrusion, wherein the support body (1) wraps the heating wire (6), and forming the outer covering layer (3) on the surface of the wire core (2) by extrusion; S2, laying a temperature-sensitive optical fiber in the strip-shaped groove (301), coating a heat-conducting medium on the outer cladding (3), and adhering the heat-conducting layer (4) to the heat-conducting medium; S3, arranging the heat-conducting layer (4) on the outer cladding layer (3) in a winding manner, so that the heat-conducting medium fills the strip-shaped groove (301); S4, arranging the limiting frame (5) and pressing the heat-conducting layer (4) so ​​that the outer covering layer (3), the heat-conducting layer (4), the limiting frame (5) and the heat-conducting medium are in close contact with each other; S5. Arranging a functional layer outside the limiting frame (5) to fix a plurality of the limiting frames (5).

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