Overhead insulated cable and production equipment therefor

Abstract

The application discloses an overhead insulated cable and a production equipment thereof, and relates to the technical field of cable processing equipment. The overhead insulated cable production equipment comprises a detection unit and a pressing unit. The detection unit comprises a detection ring, a detection capsule arranged in the detection ring, and a sensing piece arranged in the detection capsule. The detection capsule has a detection cavity for the stranded body to pass through. The sensing piece is in a strip shape, is enclosed in a ring shape, and is fixedly connected to the inner wall of the detection cavity. The pressing unit comprises a pressing pipe connected to the detection ring, a plurality of pressing heads slidably arranged in the pressing pipe, a reset piece fixedly connected between the pressing head and the pressing pipe, and a power structure transmissionally connected to the pressing head. The inner wall of the pressing pipe is provided with a sliding cavity for the pressing pipe to slide. The pressing pipe is provided with a matching cavity in communication with the sliding cavity. The matching cavity is provided with content. The power structure comprises a plurality of distribution pieces. The distribution pieces are arranged in the sliding cavity one by one. The distribution pieces are used for transferring the content between the matching cavity and the sliding cavity. The application improves the stranding quality of the stranded body.

Description

Technical Field

[0001] This invention relates to the technical field of equipment for cable processing, specifically to overhead insulated cables and their production equipment. Background Technology

[0002] Overhead insulated cables are widely used in overhead power distribution lines in urban and rural power grids. They typically consist of a conductor made of multiple stranded metal wires twisted together and compressed by a compacting die, and an insulation layer covering the outside of the conductor.

[0003] To reduce the outer diameter of the conductor, increase the fill factor, and improve the electric field distribution, the conductor is usually subjected to high compression ratio compaction stranding using a frame stranding machine and a compaction wheel.

[0004] However, after the conductor is compacted, the outer metal single wire is prone to radial elastic memory recovery due to the inherent elastic hysteresis effect and residual stress release of aluminum or aluminum alloy materials. This results in local warping or "rebound" of the outer single wire, thus causing defects such as poor strand quality. Summary of the Invention

[0005] The purpose of this invention is to provide overhead insulated cables and their production equipment to solve the problems mentioned in the background art.

[0006] In a first aspect, the present invention provides the following technical solution: an overhead insulated cable production equipment, comprising:

[0007] The detection unit includes a detection ring, a detection capsule disposed within the detection ring, and a sensing element disposed within the detection capsule. The detection capsule has a detection cavity for the passage of a stranded body. The sensing element is strip-shaped and is arranged in a ring and fixed to the inner wall of the detection cavity.

[0008] The pressing unit includes a pressing tube connected to the detection ring, multiple pressing heads slidably disposed in the pressing tube, a reset member fixed between the pressing heads and the pressing tube, and a power structure drivenly connected to the pressing heads. The inner wall of the pressing tube has a sliding cavity for sliding, and a dispensing cavity communicating with the sliding cavity is provided in the pressing tube. The dispensing cavity contains contents. The reset member has a pre-tightening force that causes the pressing head to move into the sliding cavity. The power structure includes multiple dispensing members, each corresponding to one of the sliding cavities. The dispensing members are used to transfer contents between the dispensing cavity and the sliding cavity.

[0009] Furthermore, the pressing tube is divided into a heating area, a pressing area, and a cooling area along the axial direction from near to far from the detection ring, and the pressing unit is located in the pressing area;

[0010] The pressing tube is equipped with a temperature control unit, which includes a heating component located in the heating area and a cooling component located in the cooling area. The heating component is used to heat the stranded body that passes through, and the cooling component is used to cool the stranded body that passes through.

[0011] Furthermore, the inner wall of both the heating zone and the inner wall of the cooling zone are recessed inward to form an ejection cavity. An ejection block is slidably provided on the inner wall of the ejection cavity. A return member is fixedly connected between the ejection block and the pressing tube. The return member has a pre-tightening force that causes the ejection block to move into the ejection cavity. A dispensing branch is provided in the pressing tube, which connects the dispensing cavity and the ejection cavity. The dispensing branch corresponds one-to-one with the ejection cavity. A transfer member is provided in the dispensing branch, and the transfer member transfers the contents in the dispensing cavity and the ejection cavity through the dispensing branch.

[0012] Furthermore, the pressing tube is rotatably connected to the detection ring, and the pressing unit also includes a rotating structure that is driven to the pressing tube, the rotating structure being used to drive the pressing tube to rotate.

[0013] Furthermore, the inner wall of the detection ring is provided with an annular mounting groove;

[0014] The detection unit further includes a positioning ring detachably connected to the inner wall of the mounting groove, a floating ring spaced apart within the positioning ring, and an elastic member fixed between the positioning ring and the floating ring. The elastic member has a preload force that causes the floating ring to be positioned at the center of the positioning ring.

[0015] Furthermore, the outer wall of the floating ring is universally connected with ball bearings.

[0016] Furthermore, the pressing unit also includes a water bladder fixed to the end of the pressing head.

[0017] Furthermore, the pressing unit also includes a pressure monitoring element for monitoring the pressure on the surface of the water bladder.

[0018] Furthermore, the detection unit also includes an annular spring mesh, which is fixed to the inner ring of the detection capsule.

[0019] Compared with the prior art, the beneficial effects of the present invention are: by setting a detection bladder with a sensor, the stranded body passing through the detection cavity can be contact-sensed in the whole circumference, thereby realizing the identification of the rebound position and rebound degree; according to the rebound position and rebound degree, the dispensing component transfers the contents in the dispensing cavity to the corresponding sliding cavity, drives the pressing head in that position to extend radially, and performs fixed-point pressing correction on the rebound and lifting part of the outer wall of the stranded body, thereby improving the finished quality of the stranded body.

[0020] Secondly, the present invention also provides the following technical solution: an overhead insulated cable, comprising a strand made by the above-mentioned overhead insulated cable production equipment, an insulation layer wrapped around the outer periphery of the strand, and a sheath wrapped around the outer periphery of the insulation layer. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overhead insulated cable production equipment of the present invention;

[0022] Figure 2 This is a partial schematic diagram illustrating the rotation method of the pressing tube in this invention;

[0023] Figure 3 This is a cross-sectional view of the present invention illustrating the heating area, pressing area, and cooling area;

[0024] Figure 4 for Figure 3 A magnified view of part A in the middle;

[0025] Figure 5 This is a schematic diagram illustrating the structure of the water bladder in this invention;

[0026] Figure 6 This is a cross-sectional view illustrating the installation method of the detection capsule in this invention.

[0027] In the diagram: 10. Detection unit; 101. Detection ring; 1011. Mounting groove; 102. Detection capsule; 1021. Detection cavity; 103. Positioning ring; 104. Floating ring; 1041. Ball bearing; 105. Elastic component; 106. Spring mesh;

[0028] 20. Pressing unit; 201. Pressing tube; 2011. Slide cavity; 2012. Mixing cavity; 2013. Heating area; 2014. Pressing area; 2015. Cooling area; 2016. Ejection cavity; 2017. Mixing branch; 2018. Transfer component; 202. Pressing head; 203. Reset component; 204. Distributor component; 205. Rotating structure; 206. Water bladder. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] like Figures 1-6As shown, the present invention provides a technical solution: an overhead insulated cable production equipment, including a detection unit 10 and a pressing unit 20. The detection unit 10 includes a detection ring 101, a detection capsule 102 disposed within the detection ring 101, and a sensing element disposed within the detection capsule 102. The detection capsule 102 has a detection cavity 1021 for stranded parts to pass through. The sensing element is strip-shaped and can be a piezoelectric thin film sensor or a fiber optic sensor. The sensing element is enclosed in a ring shape and fixed to the inner wall of the detection cavity 1021. The pressing unit 20 includes a pressing tube 201 connected to the detection ring 101, a plurality of pressing heads 202 slidably disposed on the pressing tube 201, and a pressing head 202 fixed to the pressing head 202 and the pressing tube 201. The reset element 203 between the pressing tube 201 and the power structure connected to the pressing head 202 are included. The inner wall of the pressing tube 201 is provided with a sliding cavity 2011 for the pressing tube 201 to slide. The pressing tube 201 is provided with a dispensing cavity 2012 communicating with the sliding cavity 2011. The dispensing cavity 2012 is provided with contents, which may be hydraulic oil. The reset element 203 has a preload force that causes the pressing head 202 to move into the sliding cavity 2011. The reset element 203 is a spring. The power structure includes multiple dispensing elements 204, which are correspondingly provided in the sliding cavity 2011. The dispensing elements 204 are used to transfer the contents between the dispensing cavity 2012 and the sliding cavity 2011. The dispensing elements 204 are solenoid valves.

[0031] The overhead insulated cable production equipment provided in this application embodiment passes the tightly twisted strand through the detection cavity 1021 of the detection chamber 102. The strand continues to move forward under the action of traction force. If there is a local warping on the outer peripheral wall of the strand due to the elastic memory recovery of the metal single wire, the warped part will radially press outward against the corresponding position on the inner wall of the detection chamber 102 when passing through the detection chamber 102. The sensor detects this compression, generates a corresponding sensing signal and transmits it to the control system. The control system determines the specific circumferential position of the rebound based on the azimuth angle of the sensing signal.

[0032] Meanwhile, the stranded body continues to move forward to the pressing tube 201. Based on the detected rebound direction, the control system sends commands to the corresponding distribution components 204 of each row of pressing heads 202. The distribution component 204 actuates, transferring the contents of the dispensing chamber 2012 to the sliding chamber 2011 where the pressing head 202 is located. The pressure in the sliding chamber 2011 increases, pushing the pressing head 202 radially outward. The extended pressing head 202 presses against the rebounded, raised portion of the outer wall of the stranded body. Using the continuous movement of the stranded body, radial back pressure is applied to the raised metal wire, causing it to re-adhere to the surface of the stranded body, completing the correction. After correction, the distribution component 204 reverses its movement, the contents flow back to the dispensing chamber 2012, and the pressing head 202 retracts under the action of the reset component 203, awaiting the next detection signal.

[0033] Compared with the prior art, by setting a detection bladder 102 with a sensor, the stranded body passing through the detection cavity 1021 can be contact-sensed in the whole circumference, thereby realizing the identification of the rebound position and rebound degree. According to the rebound position and rebound degree, the dispensing component 204 transfers the contents in the dispensing cavity 2012 to the corresponding sliding cavity 2011, drives the pressing head 202 in that position to extend radially, and performs fixed-point pressing correction on the rebound and upturned part of the outer wall of the stranded body, thereby improving the finished quality of the stranded body.

[0034] In some embodiments, see Figure 3 The pressing tube 201 is divided into a heating area 2013, a pressing area 2014 and a cooling area 2015 along the axial direction from near to far from the detection ring 101. The pressing unit 20 is located in the pressing area 2014.

[0035] The pressing tube 201 is equipped with a temperature control unit, which includes a heating component located in the heating zone 2013 and a cooling component located in the cooling zone 2015. The heating component is used to heat up the stranded body that passes through, and the cooling component is used to cool down the stranded body that passes through.

[0036] By dividing the pressing tube 201 into a heating zone 2013, a pressing zone 2014, and a cooling zone 2015 along the axial direction, and by setting a heating component in the heating zone 2013 and a cooling component in the cooling zone 2015, temperature gradient control of the stranded body before and after pressing is achieved.

[0037] As the stranded metal passes through heating zone 2013, it is heated, increasing its plasticity. This makes it easier for the outer single wires to be pressed back in subsequent pressing zone 2014, reducing the radial force required for pressing and minimizing the risk of mechanical damage to the stranded metal surface. After pressing, the stranded metal immediately enters cooling zone 2015 to be cooled by a cooling component. This allows the reset metal single wires to re-harden and solidify at a lower temperature, effectively preventing elastic recovery due to temperature rise.

[0038] In some embodiments, see Figure 4 The inner walls of the heating zone 2013 and the cooling zone 2015 are both recessed inward to form an ejection cavity 2016. An ejection block is slidably provided on the inner wall of the ejection cavity 2016. A return member is fixedly connected between the ejection block and the pressing tube 201. The return member has a pre-tightening force that causes the ejection block to move into the ejection cavity 2016. A dispensing branch 2017 is provided in the pressing tube 201, which connects the dispensing cavity 2012 and the ejection cavity 2016. The dispensing branch 2017 corresponds one-to-one with the ejection cavity 2016. A transfer member 2018 is provided in the dispensing branch 2017. The transfer member 2018 transfers the contents in the dispensing cavity 2012 and the ejection cavity 2016 through the dispensing branch 2017. The transfer member 2018 is a solenoid valve.

[0039] It should be noted that the heating element is an embedded heating element. A hole is drilled axially inside the ejector block body to embed a metal-clad heating element (stainless steel sheath, filled with magnesium oxide insulating powder, with a nickel-chromium resistance wire at the center). The heating element lead wire uses high-temperature resistant silicone cable, with sufficient length allowance to accommodate the extension and retraction of the ejector block. Resistance heat is conducted through the ejector block body (copper alloy or steel with excellent thermal conductivity) to the front end of the ejector block, and then transferred to the surface of the stranded body through contact heat transfer.

[0040] The cooling system features a built-in circulating cooling channel. A spiral or U-shaped channel is machined inside the ejector block body, with both ends connected to an external coolant circulation system (the water source is deionized water or ethylene glycol aqueous solution, with the temperature controlled by a chiller unit at 5~15℃). The coolant circulates within the ejector block, undergoing heat exchange through the contact surface between the ejector block's front end and the stranded body, absorbing heat from the stranded body and carrying it away.

[0041] The transfer component 2018 can transfer the contents of the mixing chamber 2012 to the ejection chamber 2016 corresponding to the rebound position via the corresponding mixing branch 2017 according to the measured rebound position and rebound degree, and drive the ejection block in that position to extend radially so that its front end face makes just contact with the rebounded part of the twisted body surface.

[0042] In the heating zone 2013 (cooling zone 2015), only the ejector block corresponding to the rebound position extends and contacts the stranded body, realizing targeted heating (targeted cooling) of the rebounded and raised part - precisely acting on the local area that needs temperature change, rather than indiscriminately heating (cooling) the entire circumference of the stranded body, thereby reducing the power requirement of the heating component (cooling component) and reducing energy waste.

[0043] In some embodiments, see Figure 2 The pressing tube 201 is rotatably connected to the detection ring 101. The pressing unit 20 also includes a rotating structure 205 that is driven to rotate the pressing tube 201.

[0044] It should be noted that the rotating structure 205 is a combination of a servo motor and a gear set. The gear set includes a driving wheel fixed to the servo motor and a driven wheel fixed to the outer periphery of the pressing tube 201. When the servo motor is started, it transmits torque to the pressing tube 201 through the gear set, causing the pressing tube 201 to rotate.

[0045] In actual production, the probability of rebound at each circumferential position of the stranded body is not uniform. The rotating structure 205 can drive the pressing tube 201 to rotate to the corresponding position according to the rebound position measured by the detection unit 10, so that the pressing head 202 can be aligned with the rebounded part for pressing correction, avoiding pressing offset or invalid pressing caused by the mismatch between the pressing head 202 and the rebound position.

[0046] In some embodiments, see Figure 6 The inner wall of the detection ring 101 is provided with an annular mounting groove 1011.

[0047] The detection unit 10 also includes a positioning ring 103 detachably connected to the inner wall of the mounting groove 1011, a floating ring 104 spaced apart within the positioning ring 103, and an elastic member 105 fixed between the positioning ring 103 and the floating ring 104. The elastic member 105 has a preload force that causes the floating ring 104 to be positioned at the center of the positioning ring 103. The elastic member 105 is a spring.

[0048] The elastic element 105 has a preload force that positions the floating ring 104 at the center of the positioning ring 103. When no external force is applied, the floating ring 104 remains centered, ensuring that the stranded body passes through smoothly. When the stranded body experiences radial displacement due to its own weight, the release of stranding stress, or traction fluctuations, the floating ring 104 can overcome the preload force of the elastic element 105 under the action of external force and swing accordingly, so that the inner ring of the floating ring 104 always remains in contact with the outer wall of the stranded body and moves accordingly.

[0049] This floating guide structure acts as a "mechanical filter": the low-frequency large-amplitude vibration of the strand is absorbed by the follow-up sway of the floating ring 104, and the vibration energy transmitted to the rear detection bladder 102 is greatly reduced, so that the pressure signal sensed by the sensor in the detection bladder 102 mainly comes from the local rebound of the outer single line rather than the overall lateral vibration, which greatly improves the signal-to-noise ratio and detection accuracy of the detection unit 10.

[0050] In some embodiments, see Figure 6 The outer wall of the floating ring 104 is universally connected with ball bearings 1041.

[0051] When the floating ring 104 wobbles radially due to the vibration of the stranded body, the frictional resistance decreases, making the floating ring 104 more sensitive to the vibration of the stranded body.

[0052] In some embodiments, see Figure 5 The pressing unit 20 also includes a water bladder 206 fixed to the end of the pressing head 202.

[0053] When the pressing head 202 contacts the outer wall of the stranded body under the wrapping of the water bladder 206, the water bladder 206 will adaptively deform according to the microscopic contour of the outer wall of the stranded body, and distribute the concentrated radial force of the pressing head 202 evenly to the contact area of ​​the stranded body surface through the liquid pressure in the water bladder 206. This avoids the local stress concentration caused by point contact or line contact between the rigid pressing head 202 and the metal single wire, and prevents indentation, scratches or local deformation of the stranded body surface during the pressing process.

[0054] In some embodiments, the pressing unit 20 further includes a pressure monitoring element for monitoring the pressure on the surface of the water bladder 206.

[0055] It should be noted that the pressure monitoring device (such as a thin-film pressure sensor or a fiber optic pressure sensor) is attached to the surface of the water bladder 206 or embedded inside the water bladder 206, and can collect pressure distribution data at each point on the contact surface between the water bladder 206 and the stranded body in real time.

[0056] Based on the pressure value fed back by the pressure monitoring device, the amount of contents transferred from the distribution device 204 to the corresponding slide cavity 2011 can be dynamically adjusted, thereby controlling the extension amount and pressing force of the pressing head 202, realizing closed-loop pressure control—ensuring that there is enough pressure to completely reset the raised metal wire, while avoiding excessive pressing force that could lead to excessive compression of the conductor or surface damage.

[0057] In addition, the pressure monitoring device can also help determine the degree of rebound during the detection stage: when the stranded body passes through the detection bladder 102, if the water bladder 206 generates a pressure signal, it can provide cross-verification for the sensing signal of the detection bladder 102, thereby improving the reliability of the detection.

[0058] In some embodiments, see Figure 6 The detection unit 10 also includes an annular spring net 106, which is fixed to the inner ring of the detection capsule 102.

[0059] The spring mesh 106 has excellent elastic deformation capability. When the rebounding and protruding part on the surface of the stranded body squeezes the inner wall of the detection bladder 102, the spring mesh 106 undergoes local compression deformation at the corresponding position, which transmits the protruding contour of the protruding part to the detection bladder 102 and the sensing element more clearly and more concentratedly. This is equivalent to amplifying the local deformation signal of the rebounding part and improving the detection sensitivity.

[0060] Meanwhile, the spring mesh 106, as a structural component independent of the detection bladder 102, directly faces the contact and friction of the stranded body, thus protecting the detection bladder 102 body from wear.

[0061] Based on the same inventive concept, this application also provides an overhead insulated cable, including a strand made by the above-mentioned overhead insulated cable production equipment, an insulation layer wrapped around the periphery of the strand, and a sheath wrapped around the periphery of the insulation layer.

[0062] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended embodiments and their equivalents.

Claims

1. An overhead insulated cable production equipment, characterized in that, include: The detection unit includes a detection ring, a detection capsule disposed within the detection ring, and a sensing element disposed within the detection capsule. The detection capsule has a detection cavity for the passage of a stranded body. The sensing element is strip-shaped and is enclosed in a ring shape and fixed to the inner wall of the detection cavity. as well as The pressing unit includes a pressing tube connected to the detection ring, multiple pressing heads slidably disposed in the pressing tube, a reset member fixed between the pressing heads and the pressing tube, and a power structure drivenly connected to the pressing heads. The inner wall of the pressing tube has a sliding cavity for sliding, and a dispensing cavity communicating with the sliding cavity is provided in the pressing tube. The dispensing cavity contains contents. The reset member has a pre-tightening force that causes the pressing head to move into the sliding cavity. The power structure includes multiple dispensing members, each corresponding to one of the sliding cavities. The dispensing members are used to transfer contents between the dispensing cavity and the sliding cavity.

2. The overhead insulated cable production equipment according to claim 1, characterized in that, The pressing tube is divided into a heating area, a pressing area, and a cooling area along the axial direction from near to far from the detection ring, and the pressing unit is located in the pressing area; The pressing tube is equipped with a temperature control unit, which includes a heating component located in the heating area and a cooling component located in the cooling area. The heating component is used to heat the stranded body that passes through, and the cooling component is used to cool the stranded body that passes through.

3. The overhead insulated cable production equipment according to claim 2, characterized in that, The inner walls of both the heating and cooling areas are recessed inward to form an ejection cavity. An ejection block is slidably provided on the inner wall of the ejection cavity. A return member is fixedly connected between the ejection block and the pressing tube. The return member has a pre-tightening force that causes the ejection block to move into the ejection cavity. A dispensing branch is provided in the pressing tube, connecting the dispensing cavity and the ejection cavity. The dispensing branch corresponds one-to-one with the ejection cavity. A transfer member is provided in the dispensing branch, and the transfer member transfers the contents between the dispensing cavity and the ejection cavity through the dispensing branch.

4. The overhead insulated cable production equipment according to any one of claims 1-3, characterized in that, The pressing tube is rotatably connected to the detection ring, and the pressing unit further includes a rotating structure that is driven to rotate the pressing tube.

5. The overhead insulated cable production equipment according to claim 1, characterized in that, The inner wall of the detection ring is provided with an annular mounting groove; The detection unit further includes a positioning ring detachably connected to the inner wall of the mounting groove, a floating ring spaced apart within the positioning ring, and an elastic member fixed between the positioning ring and the floating ring. The elastic member has a preload force that causes the floating ring to be positioned at the center of the positioning ring.

6. The overhead insulated cable production equipment according to claim 5, characterized in that, The outer wall of the floating ring is universally connected with ball bearings.

7. The overhead insulated cable production equipment according to claim 1, characterized in that, The pressing unit also includes a water bladder fixed to the end of the pressing head.

8. The overhead insulated cable production equipment according to claim 7, characterized in that, The pressing unit also includes a pressure monitoring device for monitoring the pressure on the surface of the water bladder.

9. The overhead insulated cable production equipment according to claim 1, characterized in that, The detection unit also includes an annular spring mesh, which is fixed to the inner ring of the detection capsule.

10. An overhead insulated cable, characterized in that, It includes a strand made by the overhead insulated cable production equipment according to any one of claims 1-9, an insulation layer wrapped around the periphery of the strand, and a sheath wrapped around the periphery of the insulation layer.

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