Thermostatic power cable for servo systems and method for manufacturing the same

Abstract

The application relates to the technical field of cables, and discloses a constant-temperature power cable for a servo system and a preparation method thereof, which comprises a supporting body, a wire core, an outer cladding layer, a heat-conducting layer, a limiting frame and a heating wire, wherein the supporting body is in a star-shaped hollow structure, a plurality of first limiting grooves are arranged on the peripheral surface of the supporting body, and the wire core is arranged in the first limiting grooves; the outer cladding layer is wrapped on 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-conducting layer is a mesh material and is adhered with a heat-conducting medium, and the heat-conducting layer is wound on the outer cladding 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. The relative positions of the plurality of wire cores can be guaranteed to be stable through the arrangement of the supporting body and the limiting frame, the extrusion resistance of the cable is effectively improved, the supporting body is in a hollow structure, which can be used for the circulation of cooling or heating medium, and the heating wire can heat the cable, so that the temperature of the cable can be regulated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cable, in particular to a constant-temperature power cable for servo system and a preparation method thereof. BACKGROUND

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

[0003] The existing patent for invention with the authorization announcement No. CN118280650B discloses a high-power constant-temperature cable and a preparation method thereof. The high-power constant-temperature cable comprises a cable core with a composite structure, an isolation layer and a sheath layer covering the outside of the cable core; the cable core is twisted by a plurality of power line cores and at least one hollow structure cooling pipe, and the inter-twisted gap is filled with heat-conducting silicone grease in a full filling structure. The heat-conducting silicone grease covers the cooling pipe and each power line core in the cross section, so that the outer wall of the cooling pipe and the outer wall of each power line core are respectively communicated.

[0004] In the above technical solution, a plurality of power line cores and cooling pipes are arranged in the isolation layer. However, since the gap is filled with heat-conducting silicone grease, the anti-extrusion capacity is poor. Although the heat-conducting silicone grease has certain viscosity, the power line core and the cooling pipe are still prone to sliding when extruded, especially since the cooling pipe is a silica gel base pipe. Although the armor layer is provided, in order to enable the heat-conducting silicone grease to cover the silica gel base pipe, the armor layer is arranged in a spiral manner and has a gap for the heat-conducting silicone grease to pass through. Therefore, the anti-extrusion capacity is not significant enough, and the cable is prone to affecting the flow of the cooling medium when extruded. SUMMARY

[0005] Therefore, the present application provides a constant-temperature power cable for servo system with stable structure and strong anti-extrusion capacity, and a preparation method thereof, so as to solve the problems of poor anti-extrusion capacity and easy influence on the flow of the internal cooling medium of the existing cable.

[0006] The technical scheme of the present application is as follows:

[0007] On the one hand, the present application provides a constant-temperature power cable for servo system, comprising a support body, a core, an outer coating, a heat-conducting layer, a limiting frame and a heating wire, wherein,

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

[0009] The outer coating is coated on the core, and a strip-shaped groove is formed in the outer coating, and a temperature-sensing optical fiber is arranged in the strip-shaped groove;

[0010] The heat-conducting layer is a mesh material and adheres a heat-conducting medium, the heat-conducting layer is wound on the outer layer, and is attached to 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 support body.

[0013] On the basis of the above technical scheme, preferably, the support body comprises a medium pipe of rigid material and a heat-conducting body of flexible material, wherein,

[0014] The surface of the medium pipe is coated with the heat-conducting body, and the first limiting groove is arranged on the heat-conducting body;

[0015] The heat-conducting body has a holding portion between the two first limiting grooves, the holding portion has a structure of wide ends and a thin middle portion, and the holding portion holds the limiting frame;

[0016] The heating wire is arranged in the heat-conducting body in a plurality of roots, and the plurality of heating wires are arranged in a circular array with the axis of the medium pipe as a reference.

[0017] On the basis of the above technical scheme, preferably, the heat-conducting body comprises an outer body, a connecting body and an inner body in an integrated structure, wherein,

[0018] The surface of the medium pipe is provided with a plurality of through holes;

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

[0020] The connecting body penetrates through the through hole and is connected with the outer body;

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

[0022] On the basis of the above technical scheme, preferably, it further comprises a return pipe piece, the return pipe piece comprises an output pipe and a return pipe, the outer body is provided with a plurality of return cavities, the plurality of return cavities are arranged in a circular array with the axis of the medium pipe as a reference, wherein,

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

[0024] The return pipe is arranged in a plurality of roots around the output pipe, one end of the return pipe is connected with the output pipe and penetrates through, and the other end is inserted into the return cavity;

[0025] The return pipe piece is wrapped in an injection molding manner and forms an integrated structure with the outer body.

[0026] On the basis of the above technical scheme, preferably, the limiting frame comprises one outer arc plate, two inner arc plates and two support plates, wherein,

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

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

[0029] The two support plates are connected to the outer arc plate at one end, and connected to the inner arc plate at the other end respectively;

[0030] The channel is formed between the two inner arc plates and the two support plates.

[0031] On the basis of the above technical scheme, preferably, the outer arc plate is convex towards the direction away from the support body, the inner arc plate is convex towards the outer arc plate, and the support plate is convex towards the connecting point of the outer arc plate and the inner arc plate;

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

[0033] On the basis of the above technical scheme, preferably, the winding layer is further included, the limiting frame is arranged in a circular array with respect to the axis of the support body, and the outer arc plates of the plurality of limiting 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 scheme, preferably, the groove depth of the strip-shaped groove is X, and the thickness of the outer coating layer is less than 2X.

[0036] On the basis of the above technical scheme, preferably, the limiting frame is made of metal material, or,

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

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

[0039] S1, forming the support body in an extrusion manner, wrapping the heating wire, and forming the outer coating layer on the surface of the core in an extrusion manner;

[0040] S2, arranging the temperature sensing optical fiber in the strip-shaped groove, coating the heat-conducting medium on the outer coating layer, and adhering the heat-conducting layer to the heat-conducting medium;

[0041] S3, arranging the heat-conducting layer on the outer coating layer in a winding manner, so that the heat-conducting medium fills the strip-shaped groove;

[0042] S4, arranging the limiting frame, and pressing the heat-conducting layer, so that the outer coating layer, the heat-conducting layer, the limiting frame and the heat-conducting medium are tightly attached;

[0043] S5, a functional layer is arranged outside the limiting frame to fix the plurality of limiting frames.

[0044] The servo system constant-temperature power cable and the preparation method thereof have the following advantages over the prior art

[0045] Advantages:

[0046] (1) By arranging the support body and the limiting frame, the support body can support the wire core through the first limiting groove, and the limiting frame can position the wire core, which can ensure the relative position of the plurality of wire cores stable, effectively improve the extrusion resistance of the cable, and the hollow structure of the support body can be used for the circulation of the cooling or heating medium to heat or cool the cable, and the heating wire can be used for heating the cable alone to adjust the temperature of the cable.

[0047] (2) The wire core is covered by the outer layer, and the outer layer is covered by the heat-conducting layer. Since the outer layer is provided with a strip-shaped groove, and the heat-conducting layer is made of a mesh material and adheres to a heat-conducting medium, when the heat-conducting layer is wound around the outer layer, the heat-conducting material can fill the strip-shaped groove and tightly adhere to the outer layer and the limiting frame, so that heat conduction between the support body, the wire core, the outer layer and the limiting frame can be realized, which is beneficial to improve the heat dissipation effect; (3) The support body is composed of a rigid medium pipe and a flexible heat conductor, so that the heat conductor can buffer the extrusion and prevent the cable from being damaged; at the same time, the rigid medium pipe can avoid excessive deformation of the support body, and also can 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 connecting body and an inner body, and the connecting body of the heat conductor passes through the medium pipe and adheres to the inner wall of the medium pipe through the inner body. Therefore, the cooling or heating medium flows along the inner body, and the heat conductor directly contacts the medium, which can effectively improve the cooling or heating effect without affecting the supporting effect of the medium pipe; (5) The limiting frame is composed of an outer arc plate, an inner arc plate and a support plate, wherein the inner arc plate contacts the heat-conducting layer, the outer arc plate is used for contacting the winding layer, and the support plate is used for supporting the outer arc plate and the inner arc plate, so as to effectively ensure the stability of the limiting frame structure and improve the extrusion resistance; at the same time, the limiting frame is a hollow structure, which can be used for medium circulation or heat-conducting medium filling, 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 communicated with the medium pipe through the reflux pipe, so as to realize the dispersion of water flow, improve the heat exchange efficiency, and realize the input and output of the medium at the same end; at the same time, the reflux pipe is integrated with the outer body of the heat conductor in an integral structure by injection molding, which can ensure the stability of the structure and prevent the leakage of the cooling medium. BRIEF DESCRIPTION OF DRAWINGS

[0050] In order to make the technical solutions of the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only show some embodiments of the present application, and for those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0051] Figure 1 It is a perspective view of the constant-temperature power cable for the servo system of the present application.

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

[0053] Figure 3 It is an internal structure view of the constant-temperature power cable for the servo system of the present application.

[0054] Figure 4 It is an end view of the constant-temperature power cable for the servo system of the present application.

[0055] Figure 5 It is a perspective view of the core and the outer layer of the constant-temperature power cable for the servo system of the present application.

[0056] Figure 6 It is an exploded structure view of the constant-temperature power cable for the servo system of the present application.

[0057] Figure 7 It is a sectional structure view of the constant-temperature power cable for the servo system of the present application.

[0058] Figure 8 It is an end view of another structure of the constant-temperature power cable for the servo system of the present application.

[0059] In the figure: 1, support body; 11, medium pipe; 12, heat conduction body; 121, outer body; 122, connecting body; 123, inner body; 124, abutting part; 101, first limiting groove; 102, through hole; 103, backflow cavity; 2, core; 3, outer layer; 301, strip-shaped groove; 4, heat conduction layer; 5, limiting frame; 51, outer arc plate; 52, inner arc plate; 53, support plate; 501, second limiting groove; 502, passage; 6, heating wire; 7, backflow pipe fitting; 71, output pipe; 72, backflow pipe; 8, winding layer. DETAILED DESCRIPTION

[0060] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of the present application.

[0061] As shown in Figures 1-8 The servo system constant temperature power cable of the present application comprises a support body 1, a wire core 2, an outer cladding layer 3, a heat conduction layer 4, a limiting frame 5, a heating wire 6, a return pipe 7 and a winding layer 8. The cable structure is not only suitable for the servo system, but also suitable for other cables.

[0062] As shown in Figure 1 , Figure 3 , Figure 4 and Figure 6 The support body 1 is a star-shaped hollow structure, and a plurality of first limiting grooves 101 are formed on the peripheral surface of the support body 1. The wire core 2 is arranged in each first limiting groove 101. The outer cladding layer 3 is wrapped on the wire core 2, and a strip-shaped groove 301 is formed in the outer cladding layer 3. A temperature sensing optical fiber is arranged in the strip-shaped groove 301. The heat conduction layer 4 is a mesh material and adheres to a heat conduction medium. The heat conduction layer 4 is wound on the outer cladding layer 3 and is attached to the first limiting groove 101.

[0063] As described above, the support body 1 is made of a heat conductive material and forms a star-shaped structure by forming a plurality of first limiting grooves 101. The support body 1 is formed by extrusion. The support body 1 is also a hollow structure for circulating cooling medium or heating medium, so as to realize temperature regulation of the cable.

[0064] After the wire core 2 is wrapped by the outer cladding layer 3, it is placed in the first limiting groove 101 to be limited by the first limiting groove 101.

[0065] In this structure, the heat conduction layer 4 is arranged to ensure that the heat of the wire core 2 can be effectively transferred to the support body 1. The heat conduction layer 4 is a mesh material and adheres to a heat conduction medium. Thus, after the heat conduction layer 4 is wound on the outer cladding layer 3, effective heat conduction can be achieved.

[0066] Specifically, the outer cladding layer 3 is provided with a strip-shaped groove 301 for accommodating the heat conduction medium. After the heat conduction layer 4 is wound on the outer cladding layer 3, the heat conduction medium can be tightly attached. The strip-shaped groove 301 increases the contact area between the outer cladding layer 3 and the heat conduction medium, thereby ensuring heat conduction.

[0067] Specifically, the heat conduction medium can be silicone grease.

[0068] In this structure, in order to realize the temperature detection of the cable, a temperature-sensing optical fiber is provided in the strip groove 301. The strip groove 301 can limit the position of the temperature-sensing optical fiber. After the heat-conducting layer 4 is wound around the outer cladding layer 3, the temperature-sensing optical fiber can be covered by the heat-conducting medium to ensure the accuracy of detection. At the same time, the winding of the heat-conducting layer 4 can effectively ensure the stability of the position of the temperature-sensing optical fiber to reduce vibration interference.

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

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

[0071] like Figures 2-4 As shown, the limiting frame 5 has two second limiting grooves 501. The limiting frame 5 is set between the two wire cores 2 and the heat-conducting layer 4 is attached through the second limiting grooves 501; the heating wire 6 is set inside the support body 1.

[0072] As described above, after a portion of the core 2 is supported by the support body 1, the side away from the support body 1 is limited by the limiting 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 sheath 3 by the second limiting groove 501. At this time, the limiting frame 5 is not only used for structural reinforcement, but also as a heat-conducting structure to accelerate the temperature regulation of the cable.

[0074] Specifically, a heating wire 6 is also provided in the support body 1 to heat the support body 1, and then the heat is conducted through the heat-conducting layer 4, the outer sheath 3 and the limiting frame 5 to achieve the heating of the cable.

[0075] like Figure 6 As shown, the support 1 includes a rigid dielectric tube 11 and a flexible heat conductor 12, wherein the surface of the dielectric tube 11 is covered with the heat conductor 12, and a first limiting groove 101 is formed on the heat conductor 12.

[0076] As described above, the support body consists of two parts: a medium tube 11 and a heat conductor 12. The medium tube 11 forms a hollow structure in the support body 1, which is used to circulate cooling or heating medium and exchange heat with the heat conductor 12. Then, through the part corresponding to the first limiting groove 101, it achieves heat conduction with the heat-conducting layer 4. This structure achieves heat conduction and buffering effect by relying on the heat conductor 12, and at the same time, it achieves structural support and medium flow by relying on the medium tube 11. The rigid medium tube 11 can avoid deformation from affecting the flow of cooling medium.

[0077] like Figure 2and Figure 6 As shown, the heat conductor 12 has a supporting part 124 located between two first limiting grooves 101. The supporting part 124 has a structure that is wide at both ends and narrow in the middle, and the supporting part 124 supports the limiting frame 5. Multiple heating wires 6 are provided in the heat conductor 12, and the multiple 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 with a supporting portion 124. This allows the supporting portion 124 to pass through the part where the distance between two adjacent wire cores 2 is the smallest. That is, the middle position of the supporting portion 124 corresponds to the part where the distance between two adjacent wire cores 2 is the smallest. 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 during the assembly of the limiting frame 5, thereby making the heat conductor 12 and the heat-conducting layer 4 fit more tightly. This helps to ensure the stability of the structure and allows 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 integral outer body 121, a connector 122, and an inner body 123. The surface of the medium tube 11 has multiple through holes 102. The outer body 121 covers the medium tube 11. The connector 122 passes through the through holes 102 and is connected to the outer body 121. The inner body 123 fits against the inner wall of the medium tube 11 and is connected to the connector 122.

[0080] As described above, the heat conductor 12 consists of an outer body 121, a connector 122, and an inner body 123. When installed, it is configured as a single-piece structure by injection molding. The medium tube 11 is installed inside the heat conductor 12. The medium tube 11 has a through hole 102. At this time, a columnar mold can be installed inside the medium tube 11. When the outer body 121 is formed by injection molding on the outside of the medium tube 11, the injection 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. Then the columnar mold is removed to form a hollow flow channel.

[0081] With this structure, the heat conductor 12 covers the medium tube 11. When the medium flows in the hollow channel, it will directly contact the inner body 123 of the heat conductor 12, 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 channel does not deform, thus avoiding affecting the flow of the cooling medium.

[0082] like Figure 2As shown, the return pipe 7 includes an output pipe 71 and a return pipe 72, and the outer body 121 is provided with a plurality of return cavities 103 arranged in a circular array with the axis of the medium pipe 11 as the reference, wherein one end of the output pipe 71 is inserted into the medium pipe 11, and the other end is a sealing structure; the return pipe 72 is arranged around the output pipe 71, and one end of the return pipe 72 is connected through the output pipe 71, and the other end is inserted into the return cavity 103; the return pipe 7 is wrapped in an injection molding manner to form an integral structure with the outer body 121.

[0083] As shown above, one end of the output pipe 71 is inserted into the medium pipe 11, and in particular, it directly contacts the inner body 123, and relies on the cooperation with the inner body 123 to ensure tight combination, and at the same time, the output pipe 71 is connected to the return cavity 103 through the return pipe 72, so that the heated or cooled medium flows through the support body 1 twice, ensuring good temperature regulation effect; and the medium is divided when returning through the plurality of return cavities 103, which can improve the heat exchange effect;

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

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

[0086] As shown above, Figure 4 The limiting frame 5 includes one outer arc plate 51, two inner arc plates 52 and two support plates 53, wherein the inner arc plate 52 is provided with two, and one end of the two inner arc plates 52 is connected, and the other end of the two inner arc plates 52 is connected with one end of the outer arc plate 51 respectively; the second limiting groove 501 is arranged on the inner arc plate 52; one end of the two support plates 53 is connected with the outer arc plate 51 respectively, and the other end of the two support plates 53 is connected with one inner arc plate 52 respectively; the passage 502 is formed between the two inner arc plates 52 and the two support plates 53;

[0087] As shown above, the end of the two inner arc plates 52 is connected, which is used to abut against the heat conductor 12 of the support body 1, and the inner arc plate 52 forms the second limiting groove 501, which is used to contact the heat conduction layer 4, so that heat can be transmitted to the limiting frame 5, and heat conduction is conducted through the limiting frame 5;

[0088] Among them, the outer arc plate 51 connects the two inner arc plates 52, and the support plate 53 is connected with the outer arc plate 51 and the inner arc plate 52, so as to ensure the overall structural strength of the limiting frame 5, and further improve the overall extrusion resistance of the cable;

[0089] Among them, 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. This gives the limiting frame 5 a certain heat preservation capacity and reduces the weight of the cable.

[0090] like Figure 4 As shown, the outer arc plate 51 protrudes in the direction away from the support body 1, the inner arc plate 52 protrudes in the direction of the outer arc plate 51, and the support plate 53 protrudes in the direction of 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 described above, the inner arc plate 52 is set in an arc shape to fit the heat-conducting layer 4, while the outer arc plate 51 and the inner arc plate 52 are also set in an arc shape to ensure structural strength, so as to improve the resistance to compression. When the channel 502 is used for media flow, the flowing media can also be fully utilized to achieve the effect of resistance to compression, so as to ensure the stability of the application.

[0092] Among them, the support plate 53 has the smallest thickness, which enables rapid heat exchange and ensures 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, thereby ensuring the structural strength of the limiting frame 5. The thickness of the inner arc plate 52 can be appropriately reduced to improve the heat exchange effect with the heat-conducting layer 4.

[0093] like Figure 8 As shown, it illustrates another structure of the limiting frame 5, in which the protrusions of the inner arc plate 52 are in opposite directions;

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

[0095] like Figure 4 As shown, multiple limit frames 5 are arranged in a circular array with the axis of the support body 1 as the reference. The outer arc plates 51 of the multiple limit frames 5 are connected to form a circular structure. The winding layer 8 is wrapped around the limit frame 5 in a spiral structure.

[0096] As described above, when multiple limiting frames 5 surround the support body 1, multiple outer arc plates 51 are connected to each other to form a circular structure. Then, after the limiting frames 5 are wound by the winding layer 8, multiple limiting frames 5 are fixed and the limiting frames 5 can be tightly attached to the heat-conducting layer 4 and the support body 1, thereby ensuring the stability of the structure and the heat conduction effect.

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

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

[0099] As the above structure, the position-limiting frame 5 of the present application provides two structures, for the shorter short-range cable, the position-limiting frame 5 can be made of metal material, so that the position-limiting frame 5 has good structural strength and heat conduction performance;

[0100] For the longer long-range cable application, the position-limiting frame 5 can be made of a flexible material with certain thermal conductivity, and filled with a heat-conducting medium inside, or the position-limiting frame 5 is used for medium flow, so as to realize cooling and heating, and at the same time relying on the support of the medium, the cable can also have certain extrusion resistance.

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

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

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

[0104] 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;

[0105] S4, arranging the position-limiting frame 5 and pressing the heat-conducting layer 4, so that the outer cladding layer 3, the heat-conducting layer 4, the position-limiting frame 5 and the heat-conducting medium are tightly attached;

[0106] S5, arranging a functional layer outside the position-limiting frame 5 to fix a plurality of position-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 are added, and in the case of requiring high strength, an armored layer can be added.

[0108] In some embodiments, only the heat-conducting layer 4 is adhered to the heat-conducting medium during preparation, and then the outer cladding layer 3 is wrapped to realize the filling of the strip-shaped groove 301.

[0109] Specific implementation steps:

[0110] In application, the medium pipe 11 of the support body 1 is used for medium flow, the medium enters the output pipe 71 of the return pipe member 7, and then flows back through the return pipe 72 and the return cavity 103, the medium can be a cooling medium or a heating medium, and heat is conducted between the heat-conducting body 12, the heat-conducting layer 4, the outer cladding layer 3, the core 2 and the position-limiting frame 5, so as to realize the heating or cooling 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 supporting plate 53. According to application requirements, the flow channels can be used to fill the heat-conducting medium or flow through the cooling or heating medium, so as to realize temperature adjustment of the cable.

[0112] The above merely describes the preferred embodiments of the present application and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A constant temperature power cable for a servo system, characterized in that: It includes a support body (1), a wire core (2), an outer sheath (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. The support body (1) has a plurality of first limiting grooves (101) on its circumferential surface, and each first limiting groove (101) is provided with the wire core (2). The outer sheath (3) covers the core (2), and the outer sheath (3) has a strip groove (301), in which a temperature-sensing optical fiber is arranged; The heat-conducting layer (4) is a mesh material and has a heat-conducting medium adhered to it. The heat-conducting layer (4) is wound around the outer layer (3) and fits the first limiting groove (101). The limiting frame (5) has two second limiting grooves (501). The limiting frame (5) is disposed between the two wire cores (2) and the heat-conducting layer (4) is attached through the second limiting grooves (501). The limiting frame (5) includes an outer arc plate (51), two inner arc plates (52), and two support plates (53). There are two inner arc plates (52), and one end of each inner arc plate (52) is connected to the other end of the outer arc plate (51). The second limiting groove (501) is provided on the inner arc plate (52). One end of each support plate (53) is connected to the outer arc plate (51), and the other end of each support plate (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). The outer arc plate (51) protrudes in a direction away from the support (1), the inner arc plate (52) protrudes in a direction towards the outer arc plate (51), and the support plate (53) protrudes in a direction towards 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); The limiting frame (5) is made of a flexible material with thermal conductivity, and the interior of the limiting frame (5) is filled with a thermally conductive medium or used for medium flow. The heating wire (6) is disposed inside the support body (1); The support (1) includes a rigid medium tube (11) and a flexible heat conductor (12), wherein the surface of the medium tube (11) is covered with the heat conductor (12), and the first limiting groove (101) is formed on the heat conductor (12); the heat conductor (12) has a supporting part (124) located between the two first limiting grooves (101), the supporting part (124) has a structure that is wide at both ends and narrow in the middle, and the supporting part (124) abuts against the limiting frame (5); multiple heating wires (6) are arranged in the heat conductor (12), and the multiple heating wires (6) are arranged in a circular array with the axis of the medium tube (11) as a reference.

2. The constant temperature power cable for a servo system as described in claim 1, characterized in that: The heat conductor (12) comprises an integral outer body (121), a connector (122), and an inner body (123), wherein, The surface of the medium tube (11) is provided with multiple through holes (102); The outer body (121) covers the medium tube (11); The connector (122) passes through the through hole (102) and is connected to the outer body (121); The inner body (123) fits against the inner wall of the medium tube (11) and is connected to the connector (122).

3. The constant temperature power cable for a servo system as described in claim 2, characterized in that: It also includes a return pipe fitting (7), which includes an output pipe (71) and a return pipe (72). The outer body (121) has multiple return cavities (103), which are arranged in a circular array with respect to the axis of the medium pipe (11). One end of the output tube (71) is inserted into the medium tube (11), and the other end is a sealed structure; Multiple return pipes (72) are arranged around the output pipe (71). One end of the return pipe (72) is connected to the output pipe (71) and the other end is inserted into the return cavity (103). The return pipe (7) is wrapped by injection molding and forms an integral structure with the outer body (121).

4. The constant temperature power cable for a servo system as described in claim 1, characterized in that: It also includes a winding layer (8), and multiple limiting frames (5) are arranged in a circular array with the axis of the support body (1) as a reference. The outer arc plates (51) of the multiple 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.

5. The constant temperature power cable for a servo system as described in any one of claims 1 to 4, characterized in that: The groove depth of the strip (301) is X, and the thickness of the outer layer (3) is less than 2X.

6. A method for preparing a constant temperature power cable for a servo system as described in any one of claims 1 to 5, characterized in that: Includes the following steps: S1. The support body (1) is formed by extrusion, the support body (1) covers the heating wire (6), and the outer sheath (3) is formed on the surface of the wire core (2) by extrusion. S2. A temperature-sensing optical fiber is laid in the strip groove (301), a heat-conducting medium is coated on the outer cladding layer (3), and the heat-conducting medium is adhered to the heat-conducting layer (4). S3. The heat-conducting layer (4) is wound onto the outer cladding layer (3) so that the heat-conducting medium fills the strip groove (301). S4. The limiting frame (5) is set up and the heat-conducting layer (4) is pressed to make the outer layer (3), the heat-conducting layer (4), the limiting frame (5) and the heat-conducting medium fit together tightly; S5. A functional layer is provided outside the limiting frame (5) to fix multiple limiting frames (5).

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