Low-wind-resistance aerial insulated cable and impressing equipment thereof

Abstract

The invention provides a low-wind-resistance aerial insulated cable and an impressing device thereof. The impressing device comprises a base; the coining device is rotationally mounted on the base and used for penetrating through a semi-finished product to be coined; and the driving device is in transmission connection with the impressing device and is used for driving the impressing device to perform rotary impressing on the semi-finished product to be impressed. The low-wind-resistance aerial insulated cable comprises a conductor and an insulating layer extruded on the surface of the conductor, and threaded grooves are imprinted on the outer surface of the insulating layer and are uniformly arranged at equal intervals; and the thread groove is formed by rotating and coining through the coining equipment. According to the invention, spiral imprinting can be carried out on the surface of an insulation or sheath in a cable extrusion molding process, and the requirements of an overhead insulated cable production process are met; and the manufactured cable with the thread groove is low in wind resistance and long in service life.

Description

Technical Field

[0001] The invention relates to the technical field of overhead insulated cables, and in particular to a low wind resistance overhead insulated cable and a stamping device thereof. Background Art

[0002] With the rapid development of my country's power system, overhead insulated cables have been widely used in power transmission and distribution systems. As an important transmission carrier connecting power stations and user ends, the performance of overhead insulated cables directly affects the stability and reliability of the power system. In actual use, due to the particularity of overhead laying, cables are exposed to the natural environment for a long time and are inevitably affected by wind resistance. Studies have shown that wind resistance is one of the main factors causing vibration, fatigue and even damage of overhead cables.

[0003] In order to reduce the impact of wind resistance on overhead insulated cables, the prior art proposes a design scheme of setting grooves on the cable surface. This design draws on the drag reduction technology in the aviation and automotive industries, and reduces the drag coefficient by destroying the laminar boundary layer and reducing the formation of vortices. Specifically, the grooved design can effectively reduce wind resistance, thereby reducing the risk of cable damage caused by wind-induced vibration. However, the existing slotted cable manufacturing technology still has many shortcomings: first, traditional stamping equipment can only achieve longitudinal stamping, which cannot meet the density and uniformity requirements of the groove distribution; second, a single longitudinal groove design may increase the risk of snow or dirt accumulation on the top of the cable; third, although a few stamping equipment have rotary stamping functions, their process parameters do not match the production requirements of overhead insulated cables, making it difficult to achieve large-scale production. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a low wind resistance overhead insulated cable and its stamping equipment, which can solve the problems that the stamping equipment in the prior art can only realize longitudinal stamping, resulting in low distribution density and uniformity of the stamping groove type, and easy accumulation of snow and dirt.

[0005] In order to achieve the above purpose and other purposes, the present invention is implemented by including the following technical solutions: as a first aspect, the present invention proposes an imprinting device, including a base; an imprinting device, including a cylinder, a central axis, a gear set and a pressure wheel assembly; the cylinder is rotatably mounted on the base; one end of the central axis is fixed to the cylinder, coaxially arranged with the cylinder, and used to pass through the semi-finished product to be imprinted; the gear set is sleeved on the central axis and rotates synchronously with the cylinder; one end of the pressure wheel assembly is arranged on the gear set, and the other end passes through the gear set and is pressed on the semi-finished product to be imprinted for imprinting; a driving device is transmission-connected to the imprinting device, and is used to drive the imprinting device to rotationally imprint the semi-finished product to be imprinted.

[0006] In one embodiment, the gear set includes a first gear, a second gear, a third gear and a fourth gear; the first gear and the second gear are respectively sleeved on both ends of the central shaft and are in contact with the central shaft bearing; a plurality of waist-shaped holes are opened on the first gear / second gear, and the waist-shaped holes are distributed in a circular array with the axis of the first gear / second gear as the rotation center, and the arc center of the waist-shaped hole does not coincide with the axis of the first gear / second gear; the third gear is arranged at the upper end of the first gear and the second gear, and is meshed with the first gear and the second gear at the same time; the fourth gear is arranged at the lower end of the first gear and the second gear, and is meshed with the first gear and the second gear at the same time; the other end of the pressing wheel assembly passes through the waist-shaped hole and is pressed on the semi-finished product to be stamped for stamping.

[0007] In one embodiment, a first convex portion is formed at the center of the third gear along the axial direction, an adjusting knob is provided on the first convex portion, and an outer side of the adjusting knob passes through the cylinder.

[0008] In one embodiment, the pressure wheel assembly includes a first connecting rod and a universal pressure wheel; the two ends of the first connecting rod are respectively limitedly installed on the outside of the first gear and the second gear, and the second end passes through the waist-shaped holes on the first gear and the second gear in turn to be connected to the universal pressure wheel.

[0009] In one embodiment, the first connecting rod is connected to the universal pressure wheel via a second connecting rod; the second connecting rod is an arc-shaped rod.

[0010] In one embodiment, one end of the second connecting rod is connected to the second end of the first connecting rod through a torsion spring.

[0011] In one embodiment, the driving device includes a motor and a first pulley, wherein the first pulley is connected to the output shaft of the motor; a second pulley is fixedly sleeved on the cylinder, and the second pulley is connected to the first pulley via a belt transmission.

[0012] As a second aspect, the present invention also provides a low wind resistance overhead insulated cable, comprising a conductor and an insulating layer extruded on the surface of the conductor, wherein the outer surface of the insulating layer is embossed with thread grooves, and the thread grooves are evenly arranged at equal intervals; the thread grooves are rotationally embossed by the embossing equipment described in the first aspect.

[0013] In one embodiment, the insulating layer is subjected to preliminary cooling and surface drying treatments and then rotary stamping is performed using the stamping equipment. After stamping is completed, the insulating layer is fully cooled and shaped.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The stamping device provided by the present invention can realize spiral stamping on the surface of insulation or sheath in the cable extrusion process by rotatably installing the stamping device on the base, and using the driving device to drive the stamping device to rotate relative to the semi-finished product to be stamped, so as to meet the production process requirements of overhead insulated cables, and the stamping groove distribution density and uniformity are high, and it is not easy to accumulate snow and dirt; 2. The structural design of the stamping device of the present invention can realize the coaxial rotation of the gear set as a whole, the pressure wheel assembly, the cylinder and the central axis. At the same time, the central axis provides rotation support for the gear set as a whole, ensuring that the gear set as a whole and the pressure wheel assembly can rotate 360 ​​degrees with the cylinder to complete the rotary stamping of the semi-finished product to be stamped; 3. The gear set of the present invention adopts a four-wheel linkage arrangement arranged on the top, bottom, left and right, and cooperates with the waist-shaped hole structure design opened on the first and second gears (i.e., the gears arranged on the left and right), so that the third gear can be rotated to drive the first gear and the second gear to rotate, thereby realizing the position control of the other end of the pressure wheel assembly, that is, the position of the universal pressure wheel from the axis of the second gear is controlled, so that the surface of the universal pressure wheel is tightly pressed against the surface of the semi-hardened insulating layer; 4. The present invention can facilitate the rotation operation of the third gear by setting an adjustment knob, thereby facilitating the adjustment of the position of the pressing wheel assembly and the stamping pressure; 5. The design of the universal pressing wheel of the present invention has the characteristic that the direction can be locked, and an angle can be provided to change from axial pressing to spiral pressing; 6. The arc design of the second connecting rod of the present invention can ensure that the universal pressure wheel is in close contact with the surface of the insulating layer under stress and does not spin; 7. The design of the torsion spring of the present invention can perform pressure compensation during the stamping process, thereby avoiding the loss of stamping due to fluctuations in the outer diameter of the semi-finished product to be stamped; 8. The driving device of the present invention drives the first pulley to rotate through the motor, and the first pulley drives the second pulley on the cylinder to rotate through the belt. The transmission structure is simple and the transmission capacity is stable. The transmission method does not interfere with the routing of the semi-finished product to be imprinted. 9. The low wind resistance overhead insulated cable provided by the present invention is extruded by an extruder, briefly cooled and shaped in a front-end cooling water tank, and then the surface moisture is blown dry by compressed air. The thread groove is then embossed by a stamping device, and finally fully cooled and shaped by a rear-end cooling water tank. The resulting cable with a thread groove has low wind resistance and a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Shown is a schematic diagram of the surface structure of a low wind resistance overhead insulated cable of the present invention.

[0016] Figure 2 Shown is a schematic diagram of the first angle structure of an imprinting device of the present invention.

[0017] Figure 3 Shown is a second angle structural schematic diagram of an imprinting device of the present invention.

[0018] Figure 4 It shows a schematic structural diagram of a central shaft, a gear set and a pressure wheel assembly in an imprinting device of the present invention.

[0019] Figure 5 Shown is a schematic structural diagram of a pressing wheel assembly in an imprinting device of the present invention. DETAILED DESCRIPTION

[0020] See also Figure 1-Figure 5 The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0021] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification for the technical personnel in this field to understand and read, and are not used to limit the conditions under which the present invention can be implemented. Therefore, they have no substantive technical significance. Any modification of the structure, change in the proportion relationship or adjustment of the size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0022] Unless otherwise defined, the technical or scientific terms used herein shall have the usual meanings as understood by persons having ordinary skills in the field to which the present invention belongs. The terms "first", "second", etc. used in the present invention are used to distinguish different objects, rather than to describe a specific order, quantity or importance. "Include" or "comprising" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. The term "connection" in the present invention includes direct and indirect connections unless otherwise specified.

[0023] like Figure 1 As shown, the present invention provides a low wind resistance overhead insulated cable 100, comprising a conductor and an insulating layer 110; the insulating layer 110 is extruded on the surface of the conductor, and a thread groove 111 is embossed on the outer surface thereof, and the thread grooves 111 are evenly arranged at equal intervals. The manufacturing method of the low wind resistance overhead insulated cable 100 is performed in the following steps: Step 1: Conductor pretreatment: The conductor is uniformly transported to the extruder head through the pay-off device to ensure that the conductor surface is clean and free of pollution; Step 2: Extrusion of the insulation layer 110: At the head of the extruder, the melted plastic insulation material is evenly coated on the surface of the conductor to form a continuous insulation layer 110; Step 3: Preliminary cooling: The semi-finished cable coated with the insulating layer 110 is briefly cooled in the front cooling water tank so that the insulating layer 110 reaches a semi-hardened state; Step 4: Surface drying: The semi-finished cable product that has been initially cooled is dried by blowing compressed air to remove residual moisture on the surface of the insulation layer 110 to ensure that the surface is dry; Step 5: embossing: convey the semi-finished cable after surface drying to the embossing equipment. When the driving device of the embossing equipment is not started, adjust the knob to control the longitudinal embossing groove depth of the insulating layer. After confirming the groove depth, start the equipment driving device to emboss the thread groove 111 on the surface of the semi-hardened insulating layer 110; control the ratio of the motor speed and the cable conveying speed to achieve the density of the thread groove 111; Step 6: Final shaping: The semi-finished cable product after stamping enters the rear cooling water tank for sufficient cooling and shaping; so that the insulating layer 110 is completely solidified.

[0024] like Figure 2~Figure 5 As shown, the stamping device includes a base 10, a driving device 20 and a stamping device 30. The driving device 20 and the stamping device 30 are arranged on the base 10, and the driving device 20 and the stamping device 30 are transmission-connected to drive the stamping device 30 to perform rotation stamping on the insulating layer 110.

[0025] The driving device 20 includes a motor 21 and a first pulley 22 . The first pulley 22 is connected to the output shaft of the motor 21 . When the output shaft of the motor 21 rotates, the first pulley 22 is driven to rotate.

[0026] The stamping device 30 includes a cylinder 31, a second pulley 32, a central shaft 33, a gear set 34 and a pressure wheel assembly 35. The cylinder 31 is rotatably mounted on the base 10 through a support frame 11 and a cylinder bearing 12. The second pulley 32 is sleeved on the cylinder 31. Specifically, the second pulley 32 is welded and fixed to the cylinder 31, so that the cylinder 31 rotates with the second pulley 32; the second pulley 32 is connected to the first pulley 22 through a belt 23. When the motor 21 drives the first pulley 22 to rotate, the second pulley 32 and the cylinder 31 are driven to rotate under the transmission of the belt 23. The central shaft 33 is a hollow shaft, one end of which is welded and fixed to the center of the side cover plate 311 of the cylinder 31. It is coaxially arranged with the cylinder 31 and is used to pass through the semi-finished cable to be stamped. The gear set 34 is sleeved on the central shaft 33 and can rotate synchronously with the cylinder 31; both ends of the pressing wheel assembly 35 are limitedly installed on the gear set 34, which can limit the axial movement of the pressing wheel assembly 35 along the central shaft 33. Specifically, one end of the pressing wheel assembly 35 is limitedly installed at one end of the first gear 341 away from the second gear 342, and the other end is limitedly installed at one end of the second gear 342 away from the first gear 341, and is pressed on the semi-finished cable for stamping.

[0027] Specifically, Figure 4As shown, the gear set 34 includes four gears, the first gear 341 and the second gear 342 are respectively sleeved at the two ends of the central shaft 33 and are in bearing contact with the central shaft 33; the first gear 341 and the second gear 342 are respectively provided with three arc-shaped waist-shaped holes 345, the three waist-shaped holes 345 are distributed in a circular array with the axis of the first gear 341 / the second gear 342 as the rotation center, and the arc center of the waist-shaped holes 345 does not coincide with the axis of the first gear 341 / the second gear 342. The third gear 343 is arranged at the upper end of the first gear 341 and the second gear 342, and meshes with the first gear 341 and the second gear 342 at the same time. The center of the third gear 343 extends axially to form a first convex portion 343a, and the first convex portion 343a is provided with an adjusting knob 312, the outer side of the adjusting knob 312 passes through the cylinder 31 and is limited therewith, so that the third gear 343 is relatively fixed to the cylinder 31. The fourth gear 344 is disposed at the lower end of the first gear 341 and the second gear 342, and is meshed with the first gear 341 and the second gear 342. The center of the fourth gear 344 is formed with a second convex portion extending axially, and the outer side of the second convex portion passes through the cylinder 31 and is limited thereto, so that the fourth gear 344 is relatively fixed to the cylinder 31. Therefore, the rotation of the cylinder 31 can drive the central shaft 33 and the entire gear set 34 to rotate coaxially therewith, and the central shaft 33 also provides rotation support for the gear set 34.

[0028] like Figure 5 As shown, the pressure wheel assembly 35 includes a first connecting rod 351, a torsion spring 352, a second connecting rod 353 and a universal pressure wheel 354. Figure 4 The first connecting rod 351 is a straight round rod, and its two ends are respectively limitedly installed on the outside of the first gear and the second gear, that is, the first end is limitedly installed on the right side of the first gear 341; the second end passes through the waist-shaped holes 345 on the first gear 341 and the second gear 342 in sequence and is limitedly installed on the left side of the second gear 342, and is connected to one end of the second connecting rod 353 through a torsion spring 352. The second connecting rod 353 is an arc-shaped rod, and the other end is connected to the universal pressure wheel 354. The torsion spring 352 can perform pressure compensation during the stamping process, and will not cause the loss of stamping due to the fluctuation of the outer diameter of the semi-finished cable. Since the stamping is performed in the spiral direction around the surface of the insulating layer 110, due to the characteristic that the direction of the universal pressure wheel 354 can be locked, an angle from axial stamping to spiral stamping can be provided. At the same time, considering the instability of the universal pressure wheel 354, the curvature design of the second connecting rod 353 can ensure that the universal pressure wheel 354 is in a state of force, close to the surface of the insulating layer 110, and does not spin.

[0029] In summary, the specific operation process of using the stamping device provided by the present invention to stamp the semi-finished product of the low wind resistance overhead insulated cable 100 is as follows: Step 1: insert the semi-finished cable that has been subjected to the extrusion of the insulating layer 110, preliminary cooling and surface drying treatment into the central shaft 33 through the cable inlet 311a of the side cover plate 311; Step 2, rotate the adjusting knob 312 to adjust the stamping pressure of the pressing wheel assembly 35 through the transmission of the gear group 34; specifically, the third gear 343 can be rotated by rotating the adjusting knob 312. Since the third gear 343 is respectively meshed with the first gear 341 and the second gear 342, and the fourth gear 344 is respectively meshed with the first gear 341 and the second gear 342, and the first gear 341 and the second gear 342 are in bearing contact with the central shaft 33, the rotation of the third gear 343 drives the first gear 341, the second gear 342 and the fourth gear 344 to rotate synchronously, wherein the rotation directions of the third gear 343 and the fourth gear 344 are opposite, and the rotation directions of the first gear 341 and the second gear 342 are opposite. When the first gear 341 and the second gear 342 rotate, the first connecting rod 351 can only slide in the waist-shaped hole 345. At the same time, since the arc center of the waist-shaped hole 345 does not coincide with the axis center of the first gear 341 / the second gear 342, after rotating the adjusting knob 312 to make the third gear 343 drive the first gear 341 and the second gear 342 to rotate, the position control of the second end of the first connecting rod 351 can be achieved, that is, the position of the universal pressure wheel 354 away from the axis center of the second gear 342 is controlled, so that the surface of the universal pressure wheel 354 is tightly pressed against the surface of the semi-hardened insulating layer 110; continue to adjust the adjusting knob 312 to make the three universal pressure wheels 354 further tighten toward the axis center of the second gear 342, and apply a certain pressure to the surface of the semi-finished cable until an indentation of a predetermined depth appears on the surface of the insulating layer 110, and then lock the adjusting knob 312 to fix the current pressure parameter; Step 3, start the motor 21, and drive the second pulley 32 to rotate through the transmission of the first pulley 22 and the belt 23; the rotation of the second pulley 32 drives the cylinder 31, the central shaft 33 and the pressure wheel assembly 35 fixed relatively thereto to rotate; at the same time, the rotation of the cylinder 31 drives the entire gear set 34 to rotate synchronously with the central shaft 33 and the pressure wheel assembly 35 through the first convex portion 343a and the second convex portion, so that the thread groove 111 can be stamped on the semi-finished cable that is fed at a uniform speed along the axial direction of the central shaft 33; Step 4: The embossed cable enters the subsequent cooling and shaping process. After the embossing is completed and the machine is shut down, the adjusting knob 312 is rotated in the reverse direction to open the universal pressing wheel 354 for easy maintenance of the equipment.

[0030] Through the above implementation, the low wind resistance overhead insulated cable 100 can be evenly and stably spirally stamped on the surface, meeting the production requirements of cables of different specifications. Each process parameter can be appropriately adjusted according to specific product requirements.

[0031] Therefore, the present invention effectively overcomes various shortcomings in the prior art and has a high industrial utilization value. The above embodiments are only illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology can modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. An imprinting device, characterized in that: include: Base; The stamping device comprises a cylinder, a central shaft, a gear set and a pressing wheel assembly; the cylinder is rotatably mounted on the base; one end of the central shaft is fixed on the cylinder and is coaxially arranged with the cylinder for passing through the semi-finished product to be stamped; the gear set is sleeved on the central shaft and rotates synchronously with the cylinder; one end of the pressing wheel assembly is arranged on the gear set, and the other end passes through the gear set and is pressed on the semi-finished product to be stamped for stamping; A driving device is connected to the stamping device and is used to drive the stamping device to perform rotation stamping on the semi-finished product to be stamped.

2. The embossing device according to claim 1, characterized in that The gear set includes a first gear, a second gear, a third gear and a fourth gear; the first gear and the second gear are respectively sleeved on the two ends of the central shaft and are in contact with the central shaft bearing; a plurality of waist-shaped holes are opened on the first gear / the second gear, and the waist-shaped holes are distributed in a circular array with the axis of the first gear / the second gear as the rotation center, and the arc center of the waist-shaped holes does not coincide with the axis of the first gear / the second gear; the third gear is arranged at the upper end of the first gear and the second gear, and is meshed with the first gear and the second gear at the same time; the fourth gear is arranged at the lower end of the first gear and the second gear, and is meshed with the first gear and the second gear at the same time; the other end of the pressing wheel assembly passes through the waist-shaped hole and is pressed on the semi-finished product to be stamped for stamping.

3. The embossing device according to claim 2, characterized in that: A first convex portion is formed at the center of the third gear along the axial direction, an adjusting knob is provided on the first convex portion, and the outer side of the adjusting knob passes through the cylinder.

4. The embossing device according to claim 3, characterized in that The pressure wheel assembly includes a first connecting rod and a universal pressure wheel; the two ends of the first connecting rod are respectively limitedly installed on the outside of the first gear and the second gear, and the second end passes through the waist-shaped holes on the first gear and the second gear in turn to be connected to the universal pressure wheel.

5. The embossing device according to claim 4, characterized in that The first connecting rod is connected to the universal pressure wheel via a second connecting rod; the second connecting rod is an arc-shaped rod.

6. The embossing device according to claim 5, characterized in that One end of the second connecting rod is connected to the second end of the first connecting rod through a torsion spring.

7. The imprinting device according to claim 1, characterized in that The driving device comprises a motor and a first pulley, wherein the first pulley is connected to the output shaft of the motor; a second pulley is fixedly sleeved on the cylinder, and the second pulley is connected to the first pulley through a belt transmission.

8. A low wind resistance overhead insulated cable comprising a conductor and an insulating layer extruded on the surface of the conductor, characterized in that: The outer surface of the insulating layer is embossed with thread grooves, and the thread grooves are evenly arranged at equal intervals; the thread grooves are formed by rotational embossing using an embossing device as described in any one of claims 1 to 7.

9. The low wind resistance overhead insulated cable according to claim 8, characterized in that: After the insulating layer is initially cooled and surface dried, it is subjected to rotary stamping by the stamping device, and after the stamping is completed, it is fully cooled and shaped.

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