A low-wind-resistance overhead insulated cable and its embossing equipment

Abstract

The present invention provides a low-wind-resistance overhead insulated cable and an embossing device thereof. The embossing device includes a base; an embossing device rotatably installed on the base and used to pass through a semi-finished product to be embossed; a driving device drivingly connected to the embossing device and used to drive the embossing device to perform rotary embossing on the semi-finished product to be embossed. The low-wind-resistance overhead insulated cable includes a conductor and an insulating layer extruded on the surface of the conductor. Thread grooves are embossed on the outer surface of the insulating layer, and the thread grooves are uniformly arranged at equal intervals; the thread grooves are formed by rotary embossing using the embossing device. The present invention can realize spiral embossing on the surface of the insulation or sheath during the cable extrusion process, meeting the production process requirements of overhead insulated cables; the cable with thread grooves prepared has low wind resistance and a long 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 two ends of the central shaft and are in bearing contact with the central shaft; a plurality of kidney-shaped holes are formed in the first gear / second gear, the kidney-shaped holes are annularly arranged around the axis of the first gear / second gear as the rotation center, and the arc center of the kidney-shaped hole does not coincide with the axis of the first gear / second gear; the third gear is arranged above the first gear and the second gear and meshes with both the first gear and the second gear at the same time; the fourth gear is arranged below the first gear and the second gear and meshes with both the first gear and the second gear at the same time; the other end of the pressure wheel assembly passes through the kidney-shaped hole and presses on the semi-finished product to be embossed for embossing.

[0007] In one embodiment, a first convex portion is formed by axially extending the center of the third gear, and an adjusting knob is arranged on the first convex portion, and the outer side of the adjusting knob passes through the cylinder body.

[0008] In one embodiment, the pressure wheel assembly includes a first connecting rod and a universal pressure wheel; two ends of the first connecting rod are respectively and limit-installed on the outer sides of the first gear and the second gear, and the second end sequentially passes through the kidney-shaped holes in the first gear and the second gear and is connected to the universal pressure wheel.

[0009] In one embodiment, the first connecting rod and the universal pressure wheel are connected by 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, and the first pulley is connected to the output shaft of the motor; a second pulley is fixedly sleeved on the cylinder body, and the second pulley is connected to the first pulley through belt transmission.

[0012] As a second aspect, the present invention also provides a low-wind-resistance overhead insulated cable, which includes a conductor and an insulating layer extruded on the surface of the conductor, and thread grooves are embossed on the outer surface of the insulating layer, and the thread grooves are evenly arranged at equal intervals; the thread grooves are rotationally embossed and formed by using the embossing device as described in the first aspect.

[0013] In one embodiment, after the insulating layer is preliminarily cooled and surface-dried, it is rotationally embossed by using the embossing device, and after the embossing is completed, it is fully cooled and shaped.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. The embossing device provided by the present invention rotates and installs the embossing device on the base, and uses the driving device to drive the embossing device to rotate relative to the semi-finished product to be embossed, so that spiral embossing can be realized on the surface of the insulation or sheath during the cable extrusion process, meeting the production process requirements of overhead insulated cables, and the distribution density and uniformity of the embossing groove type are high, and it is not easy to accumulate snow and dirt;

[0016] 2. The structural design of the embossing device of the present invention can realize the coaxial rotation of the whole gear set, the pressure wheel assembly, the cylinder body and the central shaft. At the same time, the central shaft provides rotational support for the whole gear set, ensuring that the whole gear set and the pressure wheel assembly can rotate 360 degrees with the cylinder body to complete the rotary embossing of the semi-finished product to be embossed;

[0017] 3. The gear set of the present invention adopts a four-wheel linkage arrangement of upper, lower, left and right. With the design of the waist-shaped hole structure opened on the first and second gears (i.e., the gears arranged left and right), it can realize that rotating the third gear drives 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, controlling the position of the universal pressure wheel from the axis of the second gear, so that the surface of the universal pressure wheel tightly presses on the surface of the semi-hardened insulating layer;

[0018] 4. The present invention can facilitate the rotation operation of the third gear by setting the adjustment knob, thereby facilitating the adjustment of the position of the pressure wheel assembly and the embossing pressure;

[0019] 5. The design of the universal pressure wheel of the present invention has the characteristic that the direction can be locked, and can provide an angle for changing from axial embossing to spiral embossing;

[0020] 6. The arc design of the second connecting rod of the present invention can ensure that the universal pressure wheel closely adheres to the surface of the insulating layer under the stressed state without spinning;

[0021] 7. The design of the torsion spring of the present invention can perform pressure compensation during the embossing process to avoid the loss of embossing caused by the fluctuation of the outer diameter of the semi-finished product to be embossed;

[0022] 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 body to rotate through the belt. The transmission structure is simple and the transmission ability is stable, and the transmission method does not interfere with the routing of the semi-finished product to be embossed;

[0023] 9. After the low-wind-resistance overhead insulated cable provided by the present invention is extruded by an extruder, it is briefly cooled and shaped by a front-section cooling water tank, the surface moisture is blown dry by compressed air, then the thread groove is embossed by an embossing device, and finally it is fully cooled and shaped by a rear-section cooling water tank. The obtained cable with thread grooves has low wind resistance and long service life. Description of the Drawings

[0024] Figure 1 Shown is a schematic diagram of the surface structure of a low-wind-resistance overhead insulated cable according to the present invention.

[0025] Figure 2 Shown is a schematic diagram of the structure of a stamping device according to the present invention from a first angle.

[0026] Figure 3 Shown is a schematic diagram of the structure of a stamping device according to the present invention from a second angle.

[0027] Figure 4 Shown is a schematic diagram of the central shaft, gear set and pressure wheel assembly in a stamping device according to the present invention.

[0028] Figure 5 Shown is a schematic diagram of the pressure wheel assembly in a stamping device according to the present invention. Detailed implementation manners

[0029] Please refer to Figures 1 - 5 . The following uses specific specific examples to illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0030] It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the limiting conditions under which the present invention can be implemented. Therefore, they do not have technical essence. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention.

[0031] Unless otherwise defined, the technical terms or scientific terms used herein should be understood in the general meaning as understood by those of ordinary skill in the field to which the present invention belongs. The "first", "second", etc. used in the present invention are used to distinguish different objects, rather than to describe a specific order, quantity or importance. "Including" or "comprising" and other similar words mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. And the "connection" mentioned in the present invention, unless otherwise specified, includes both direct and indirect connections.

[0032] As Figure 1 shown, the present invention provides a low-wind-resistance overhead insulated cable 100, including a conductor and an insulating layer 110; the insulating layer 110 is extruded on the surface of the conductor, and thread grooves 111 are embossed on its outer surface, and the thread grooves 111 are evenly arranged at equal intervals. The manufacturing method of the low-wind-resistance overhead insulated cable 100 is carried out according to the following steps:

[0033] 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;

[0034] 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;

[0035] 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;

[0036] 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;

[0037] 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;

[0038] 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.

[0039] like Figures 2 - 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.

[0040] 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.

[0041] 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.

[0042] Specifically, Figure 4As shown in the figure, the gear set 34 includes four gears. The first gear 341 and the second gear 342 are respectively sleeved at both ends of the central shaft 33 and are in bearing contact with the central shaft 33. Three arc-shaped waist-shaped holes 345 are respectively formed in the first gear 341 and the second gear 342. The three waist-shaped holes 345 are annularly arranged with the axis of the first gear 341 / second gear 342 as the rotation center, and the arc center of the waist-shaped hole 345 does not coincide with the axis of the first gear 341 / second gear 342. The third gear 343 is arranged above the first gear 341 and the second gear 342 and meshes with both the first gear 341 and the second gear 342 at the same time. A first convex portion 343a is formed by axially extending the center of the third gear 343. An adjusting knob 312 is arranged on the first convex portion 343a. The outside of the adjusting knob 312 passes through the cylinder 31 and is limited thereto, so that the third gear 343 is relatively fixed to the cylinder 31. The fourth gear 344 is arranged below the first gear 341 and the second gear 342 and meshes with both the first gear 341 and the second gear 342 at the same time. A second convex portion is formed by axially extending the center of the fourth gear 344. The outside 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 provides rotational support for the gear set 34 at the same time.

[0043] As Figure 5 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. Please combine Figure 4 FIG., the first connecting rod 351 is a straight round rod, and both ends are limited and installed on the outside of the first gear and the second gear, that is, the first end is limited and installed on the right side of the first gear 341; the second end sequentially passes through the waist-shaped holes 345 on the first gear 341 and the second gear 342 and is limited and 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 embossing process and will not cause the loss of embossing due to the fluctuation of the outer diameter of the semi-finished cable. Since the embossing is carried out along the spiral direction on 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 can be provided for changing the axial embossing to spiral embossing. At the same time, considering the instability of the universal pressure wheel 354, the arc design of the second connecting rod 353 can ensure that the universal pressure wheel 354 closely adheres to the surface of the insulating layer 110 under the force and does not rotate.

[0044] In summary, the specific operation process of imprinting the semi-finished product of the low-wind-resistance overhead insulated cable 100 using the imprinting device provided by the present invention is as follows:

[0045] Step 1: Pass the cable semi-finished product that has completed the extrusion, preliminary cooling, and surface drying of the insulating layer 110 through the inlet 311a of the side cover plate 311 into the central shaft 33.

[0046] Step 2: Rotate the adjustment knob 312 to adjust the imprinting pressure of the pressure wheel assembly 35 through the transmission of the gear set 34. Specifically, rotating the adjustment knob 312 can rotate the third gear 343. Since the third gear 343 meshes with the first gear 341 and the second gear 342 respectively, the fourth gear 344 meshes with the first gear 341 and the second gear 342 respectively, 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. Among them, 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 within the kidney-shaped hole 345. At the same time, since the center of the arc of the kidney-shaped hole 345 does not coincide with the axis of the first gear 341 / second gear 342, after rotating the adjustment knob 312 to drive the first gear 341 and the second gear 342 to rotate by the third gear 343, 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 from the axis of the second gear 342 can be controlled, so that the surface of the universal pressure wheel 354 tightly presses on the surface of the semi-hardened insulating layer 110. Continue to adjust the adjustment knob 312 to further tighten the three universal pressure wheels 354 towards the axis of the second gear 342, apply a certain pressure to the surface of the cable semi-finished product until a predetermined depth of indentation appears on the surface of the insulating layer 110, and lock the adjustment knob 312 to fix the current pressure parameter.

[0047] Step 3: Start the motor 21, 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 that are relatively fixed to it 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 grooves 111 can be imprinted on the cable semi-finished product that is advancing uniformly along the axial direction of the central shaft 33.

[0048] Step 4: The cable after embossing enters subsequent cooling and shaping. After the embossing is completed and the machine stops, rotate the adjustment knob 312 in the reverse direction to open the universal pressure wheel 354 for easy equipment maintenance.

[0049] Through the above implementation manner, uniform and stable spiral embossing on the surface of the low-wind-resistance overhead insulated cable 100 can be achieved, meeting the production requirements of cables of different specifications. Each process parameter can be appropriately adjusted according to specific product requirements.

[0050] Therefore, the present invention effectively overcomes various disadvantages in the prior art and has high industrial utilization value. The above embodiments are only illustrative of the principles and effects of the present invention and are not used to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea 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 imprinted; The gear set is sleeved on the central shaft and rotates synchronously with the cylinder; 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 sleeved on both ends of the central shaft respectively and are in contact with the central shaft bearing; a plurality of waist-shaped holes are provided 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 ends 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 ends of the first gear and the second gear, and is meshed with the first gear and the second gear at the same time; The pressing wheel assembly comprises a first connecting rod, a second connecting rod, a torsion spring and a universal pressing wheel; the first end of the first connecting rod is arranged on the gear set, and the second end passes through the waist-shaped hole and is connected to the universal pressing wheel through the second connecting rod; the universal pressing wheel presses on the semi-finished product to be stamped for stamping; one end of the second connecting rod is connected to the second end of the first connecting rod through the torsion spring; 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 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.

3. The embossing device according to claim 2, characterized in that: The two ends of the first connecting rod are respectively limitedly installed on the outer sides 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 sequence to be connected with the universal pressure wheel.

4. The embossing device according to claim 3, characterized in that The second connecting rod is an arc-shaped rod.

5. 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.

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