Insulated cable magnesium oxide powder filling system

Abstract

The invention discloses an insulated cable magnesium oxide powder filling system, and relates to the technical field of cables and electric heaters. Comprising a high-position powder bin, a distributing hopper, a rotary transmission device, a supporting device and a spiral conveying piece, the high-position powder bin is located above the distributing hopper, a control valve is arranged at a discharging port of the high-position powder bin, a hopper conical surface is arranged on the upper portion of the distributing hopper, a hopper pipeline is arranged on the lower portion of the distributing hopper, and a flange with a spigot is fixedly installed on the outer side of the hopper pipeline. The output end of the rotary transmission device is connected with the flange with the spigot, the material distribution hopper is installed on the supporting device, and the multiple spiral conveying pieces are evenly arranged on the inner wall of the hopper pipeline. The powder scattering uniformity and the initial compactness can be improved through a circumferential rotary material distribution mode and propelling conveying of the spiral conveying pieces, the powder filling effect can be optimized through reasonable matching of the rotating speed of the material distribution hopper and the spiral angles of the spiral conveying pieces, and the system has certain flexibility and can meet the process requirements of different working conditions of an actual production line.

Description

Technical Field

[0001] This invention relates to the fields of aluminum, cables, and electric heaters, and specifically to a magnesium oxide powder filling system for insulated cables. Background Technology

[0002] Magnesium oxide (MgO) is widely used in cables, electric heaters, and other fields due to its excellent insulation and fire-resistant properties. Most existing metal-sheathed cable and high-power heater production lines employ a vertical MgO filling process. In this system, MgO powder is injected into an insulating annular cavity via a feed funnel using gravity flow. The powder is then compacted by an external vibrator. The impact and external vibration give the MgO powder a certain compaction density. Subsequently, the MgO powder, encased in a sheath, is further compacted and densified through multiple rolling passes. The compaction density characteristics of the MgO powder directly affect the insulation and thermal conductivity of cables and electric heaters. Clearly, the compaction characteristics of the MgO powder before rolling have a significant impact on the compaction characteristics after rolling.

[0003] The current filling process system has the following shortcomings:

[0004] 1) Magnesium oxide powder is composed of particles ranging from a few micrometers to hundreds of micrometers. Due to the small mass of the powder, simply increasing the filling height to increase the powder flow rate and tap density will increase the height of the process system, increase costs, and result in poor economic benefits.

[0005] 2) Increasing the vibration frequency of an external vibrator to increase the compaction density is limited by the vibration power and the strength and stiffness of the sheath.

[0006] 3) When magnesium oxide powder flows from the high-level silo into the filling funnel, since the funnel is fixed, the falling magnesium oxide powder particles will inevitably exhibit particle size classification on the surface of the funnel. That is, large particles are thrown to the far point, while small particles fall to the near point. As a result, uneven particle distribution will occur when the powder enters the insulating annular cavity.

[0007] 4) When magnesium oxide powder flows from the funnel opening into the pipe opening, it is prone to blockage, which affects the filling effect of the powder.

[0008] The aforementioned issues can affect the uniformity of magnesium oxide powder particle distribution and initial density, ultimately impacting the insulation and heat resistance of cables or electric heaters. Summary of the Invention

[0009] The purpose of this invention is to provide a magnesium oxide powder filling system for insulated cables, so as to solve the problems of uneven distribution of magnesium oxide powder particles and low initial density in existing magnesium oxide powder filling systems for sheathed insulated cables and heaters.

[0010] This invention provides a technical solution:

[0011] A magnesium oxide powder filling system for insulating cables includes a high-level powder silo, a feeding funnel, a rotary transmission device, a support device, and spiral conveyor plates. The high-level powder silo is located above the feeding funnel. The outlet of the high-level powder silo is equipped with a control valve. The upper part of the feeding funnel has a funnel cone surface, and the lower part has a funnel pipeline. A flange with a stop flange is fixedly installed on the outside of the funnel pipeline. The output end of the rotary transmission device is connected to the flange with a stop flange. The feeding funnel is installed on the support device. A plurality of spiral conveyor plates are evenly arranged on the inner wall of the funnel pipeline.

[0012] When the control valve is opened, the magnesium oxide powder stored in the high-level powder silo flows by gravity to the funnel cone surface. The rotary transmission device drives the feeding funnel to rotate, so that the magnesium oxide powder conveyed by the high-level powder silo is evenly distributed along the circumference of the funnel cone surface. Under the rotary motion of the feeding funnel, the spiral conveyor plate generates a pushing force on the magnesium oxide powder in the conveying direction, conveying and compacting it.

[0013] Furthermore, the rotary transmission device includes a rotary motor, a first gear ring, and a second gear ring. The output shaft of the rotary motor is connected to the first gear ring, the first gear ring meshes with the second gear ring, and the second gear ring is concentrically assembled with the flange with a stop.

[0014] Furthermore, the output shaft of the rotary motor passes through the inner hole of the first gear ring, and the two are connected by a key. The flange with a stop is connected to the second gear ring by connecting bolts.

[0015] Furthermore, the outer teeth of the first gear ring mesh with the inner teeth of the second gear ring.

[0016] Furthermore, the support device includes a mounting base, and the side of the fabric funnel is provided with a support shoulder, which is placed on the mounting base via a support bearing.

[0017] Furthermore, the support device also includes an upper retaining ring and a lower retaining ring. The mounting base and the funnel pipe are respectively provided with a first retaining ring groove and a second retaining ring groove. The upper retaining ring is placed in the first retaining ring groove, and the lower retaining ring is placed in the second retaining ring groove.

[0018] Furthermore, the spiral conveyor plate moves synchronously with the funnel pipe. When the funnel pipe rotates counterclockwise, the spiral conveyor plate rotates to the left, and when the funnel pipe rotates clockwise, the spiral conveyor plate rotates to the right, so that the spiral conveyor plate generates an axial thrust on the magnesium oxide powder.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] In this invention, a high-level powder silo is positioned above a feeding funnel. Magnesium oxide powder is transported by its own weight from the high-level powder silo to the cone surface of the feeding funnel. Driven by a rotary transmission device, the feeding funnel evenly distributes the magnesium oxide powder transported from the high-level powder silo along the circumference of the cone surface of the funnel. Spiral conveyor blades are evenly arranged on the inner wall of the funnel pipe. Under the rotational motion of the feeding funnel, the spiral conveyor blades can generate a propulsive force on the magnesium oxide powder along the conveying direction. This force makes the magnesium oxide powder more compact. The use of circumferential rotary feeding and spiral conveyor blade propulsion can improve the uniformity of powder distribution and initial compactness.

[0021] This invention enables a more uniform distribution of magnesium oxide powder particles, prevents powder from clogging at the funnel pipe opening, and features magnesium oxide powder power transmission. It can be widely used in fields such as sheathed cables and high-power heaters. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 For the present invention Figure 1 A magnified view of a portion of the image.

[0024] Icons: 1. High-level powder silo; 2. Control valve; 3. Funnel cone surface; 4. Flange with stop; 5. Connecting bolt; 6. Large gear ring; 7. Small gear ring; 8. Support shoulder; 9. Rotary motor; 10. Mounting base; 11. Upper retaining ring; 12. Support bearing; 13. Lower retaining ring; 14. Funnel pipeline; 15. Screw conveyor plate; 16. Battery cell. Detailed Implementation

[0025] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0026] Please see Figures 1 to 2 This embodiment provides a magnesium oxide powder filling system for insulated cables, including a high-level powder silo 1, a feeding funnel, a rotary transmission device, a support device, and spiral conveyor plates 15. The high-level powder silo 1 is located above the feeding funnel. The outlet of the high-level powder silo 1 is equipped with a control valve 2. The upper part of the feeding funnel is equipped with a funnel cone surface 3, and the lower part is equipped with a funnel pipeline 14. A flange with a stop flange 4 is fixedly installed on the outside of the funnel pipeline 14. The output end of the rotary transmission device is connected to the flange with a stop flange 4. The feeding funnel is installed on the support device, and several spiral conveyor plates 15 are evenly arranged on the inner wall of the funnel pipeline 14.

[0027] During operation, when control valve 2 is opened, the magnesium oxide powder stored in the high-level powder silo 1 flows by gravity onto the funnel cone surface 3. A rotary transmission device drives the feeding funnel to rotate, evenly distributing the magnesium oxide powder from the high-level powder silo 1 along the circumference of the funnel cone surface 3. Under the rotational motion of the feeding funnel, the spiral conveyor 15 generates a propulsive force along the conveying direction on the magnesium oxide powder, conveying and compacting it. The use of a circumferential rotary feeding method and spiral conveyor propulsion improves the uniformity of powder distribution and initial density.

[0028] In this embodiment, the rotary transmission device includes a rotary motor 9, a first gear ring 7, and a second gear ring 6. The output shaft of the rotary motor 9 is connected to the first gear ring 7, and the first gear ring 7 and the second gear ring 6 are meshed together. The second gear ring 6 is concentrically assembled with a flange with a stop flange 4. The rotational speed of the rotary motor 9 is adjustable. The output shaft of the rotary motor 9 passes through the inner hole of the first gear ring 7, and the two are connected by a key. The flange with a stop flange 4 is connected to the second gear ring 6 by connecting bolts 5.

[0029] Specifically, the first gear ring 7 is a small gear ring, and the second gear ring 6 is a large gear ring. The outer teeth of the first gear ring 7 mesh with the inner teeth of the second gear ring 6.

[0030] In this embodiment, the support device includes a mounting base 10, an upper retaining ring 11, and a lower retaining ring 13. A support shoulder 8 is provided on the side of the fabric funnel, and the support shoulder 8 is placed on the mounting base 10 via a support bearing 12. The mounting base 10 and the funnel pipe 14 are respectively provided with a first retaining ring groove and a second retaining ring groove. The upper retaining ring 11 is placed in the first retaining ring groove, and the lower retaining ring 13 is placed in the second retaining ring groove. Multiple sets of the support device can be arranged according to the actual process system requirements, and its components can be increased or decreased.

[0031] Specifically, the upper and lower surfaces of the support bearing 12 contact the support shoulder 8 and the mounting base 10, respectively. The upper retaining ring is installed in the first retaining ring groove of the mounting base 10 to support the upper positioning of the bearing 12. The lower retaining ring 13 is installed in the second retaining ring groove outside the funnel pipe 14 to transmit the upward axial force on the funnel pipe 14 to the support bearing 12.

[0032] In this embodiment, the spiral conveyor 15 is located on the inner wall of the funnel pipe 14. The two can be fixed together by means of welding or mechanical connection, but not limited to, to ensure that the spiral conveyor 15 moves synchronously with the funnel pipe 14. When the funnel pipe 14 rotates counterclockwise, the spiral conveyor 15 rotates to the left; when the funnel pipe 14 rotates clockwise, the spiral conveyor 15 rotates to the right, so that the spiral conveyor 15 generates an axial thrust on the magnesium oxide powder. That is, the tilt direction of the spiral conveyor 15 is coordinated with the rotation direction of the funnel pipe 14 to ensure that when the funnel pipe 14 rotates, the spiral conveyor 15 conveys the magnesium oxide powder into the cable insulation annular cavity.

[0033] Preferably, the funnel cone surface 3, the funnel pipe 14, the flange with stop 4, and the support shoulder 8 can be integrated into a single structure by welding or mechanical connection, but not limited to these methods, to form a powder filling and distributing funnel; wherein the funnel cone surface, the funnel pipe, the flange with stop 4, and the support shoulder are concentric structures. A battery cell 16 is provided at the center of the funnel pipe 14.

[0034] The working process of the magnesium oxide powder filling system is as follows:

[0035] Magnesium oxide powder is pre-loaded into the high-level powder silo 1. When the control valve 2 is opened, the magnesium oxide powder flows by gravity from the high-level powder silo 1 onto the cone surface 3 of the distribution funnel. At this time, driven by the rotary motor 9, the power is transmitted to the distribution funnel through the first gear ring 7, the second gear ring 6, and the connecting bolt 5. The rotational motion of the distribution funnel makes the magnesium oxide powder falling onto the cone surface 3 more evenly distributed, avoiding the grading problem caused by particle size differences when the powder slides down by its own weight. At the same time, the funnel pipeline 14 rotates synchronously, and the spiral conveying plates 15 arranged on its wall, due to the existence of the spiral angle, facilitate the distribution of magnesium oxide powder. Magnesium oxide powder generates a downward pushing force, which promotes the powder to flow downward into the cable annular cavity through the funnel pipe opening, avoiding powder congestion at the pipe opening. At the same time, the pushing force can also force the powder to be conveyed downward. The magnesium oxide powder is conveyed by a combination of gravity flow and power. The axial reaction force of the magnesium oxide powder on the spiral conveyor plate is borne by the support device. The speed of the rotary motor 9 is adjustable to meet the actual process system's requirements for the amount of magnesium oxide powder conveyed. Ultimately, this improves the problems of uneven particle size distribution of magnesium oxide powder, unsatisfactory filling effect, and insufficient initial density in the existing technology.

[0036] In this embodiment, the magnesium oxide powder at the bottom of the cone flows downward into the cable annular cavity through the funnel pipe opening under the action of gravity. On the other hand, it is forced to be conveyed into the cable annular cavity under the action of the axial thrust generated by the rotation of the spiral conveyor plate on the inner wall of the pipe. Furthermore, the spiral conveyor plate at the pipe inlet can also reduce the congestion phenomenon when the magnesium oxide powder falls by gravity. Therefore, it can improve the filling effect during magnesium oxide powder filling and increase the initial density, thereby overcoming the technical shortcomings of the existing magnesium oxide powder filling system.

[0037] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A magnesium oxide powder filling system for insulated cables, characterized in that, The device includes a high-level powder silo (1), a material feeding funnel, a rotary transmission device, a support device, and a spiral conveyor plate (15). The high-level powder silo (1) is located above the material feeding funnel. The outlet of the high-level powder silo (1) is equipped with a control valve (2). The upper part of the material feeding funnel is equipped with a funnel cone surface (3), and the lower part is equipped with a funnel pipeline (14). A flange with a stop flange (4) is fixedly installed on the outside of the funnel pipeline (14). The output end of the rotary transmission device is connected to the flange with a stop flange (4). The material feeding funnel is installed on the support device. Several spiral conveyor plates (15) are evenly arranged on the inner wall of the funnel pipeline (14). When the control valve (2) is opened, the magnesium oxide powder stored in the high-level powder silo (1) flows by gravity to the funnel cone surface (3). The rotary transmission device is used to drive the feeding funnel to rotate, so that the magnesium oxide powder conveyed by the high-level powder silo (1) is evenly distributed along the circumference of the funnel cone surface (3). Under the rotary motion of the feeding funnel, the spiral conveyor plate (15) generates a pushing force on the magnesium oxide powder along the conveying direction, conveying and compacting it.

2. The magnesium oxide powder filling system for insulated cables as described in claim 1, characterized in that, The rotary transmission device includes a rotary motor (9), a first gear ring (7) and a second gear ring (6). The output shaft of the rotary motor (9) is connected to the first gear ring (7). The first gear ring (7) is meshed with the second gear ring (6). The second gear ring (6) is concentrically assembled with the flange with stop (4).

3. The magnesium oxide powder filling system for insulated cables as described in claim 2, characterized in that, The output shaft of the rotary motor (9) passes through the inner hole of the first gear ring (7) and the two are connected by a key. The flange with stop (4) is connected to the second gear ring (6) by a connecting bolt (5).

4. The magnesium oxide powder filling system for insulated cables as described in claim 2, characterized in that, The outer teeth of the first toothed ring (7) mesh with the inner teeth of the second toothed ring (6).

5. The magnesium oxide powder filling system for insulated cables as described in claim 1, characterized in that, The support device includes a mounting base (10), and a support shoulder (8) is provided on the side of the fabric funnel. The support shoulder (8) is placed on the mounting base (10) via a support bearing (12).

6. The magnesium oxide powder filling system for insulated cables as described in claim 5, characterized in that, The support device also includes an upper retaining ring (11) and a lower retaining ring (13). The mounting base (10) and the funnel pipe (14) are respectively provided with a first retaining ring groove and a second retaining ring groove. The upper retaining ring (11) is placed in the first retaining ring groove, and the lower retaining ring (13) is placed in the second retaining ring groove.

7. The magnesium oxide powder filling system for insulated cables as described in claim 1, characterized in that, The spiral conveyor (15) moves synchronously with the funnel pipe (14). When the funnel pipe (14) rotates counterclockwise, the spiral conveyor (15) rotates to the left and when the funnel pipe (14) rotates clockwise, the spiral conveyor (15) rotates to the right, so that the spiral conveyor (15) generates an axial thrust on the magnesium oxide powder.

Images