WO2021042750A1

WO2021042750A1 - Adjustable-speed screw rod lifting-type buried ring main unit system and control method

Info

Publication number: WO2021042750A1
Application number: PCT/CN2020/088279
Authority: WO
Inventors: 李念峰; 张正国; 隰桂吉; 何宏伟; 刘国海; 钱忠
Original assignee: 南京高立工程机械有限公司
Priority date: 2019-09-06
Filing date: 2020-04-30
Publication date: 2021-03-11
Also published as: CN211456373U; CN111106547A

Abstract

An adjustable-speed screw rod lifting-type buried ring main unit system and a control method, comprising a ring main unit (13) and a vertical lifting structure, the vertical lifting structure comprising a screw rod support frame (1), a lifting bracket (8), guide wheels (9), guide rails (7), a screw rod (4), a worm gear speed reducer (10), and a variable frequency motor (11), the bottom end of the screw rod (4) being fixedly connected to the bottom part of the screw rod support frame (1), and the inner thread of the worm gear in the worm gear speed reducer (10) being engaged with the screw rod (4). By means of the combined use of the screw rod (4), the lifting bracket (8), the worm gear speed reducer (10), the variable speed motor (11), and a frequency converter (12), the present system can gradually increase and decrease the starting and stopping speed of the ring main unit (13) during vertical lifting, preventing damage to the electrical components in the ring main unit (13) and poor contact of the internal connections of the ring main unit (13) caused by sudden starting or stopping of the ring main unit (13) during vertical lifting, thereby making lifting of the ring main unit (13) more stable and prolonging the service life of the ring main unit (13), and being highly practical. Also relating to a control method for said system.

Description

Adjustable speed screw lifting type underground ring network cabinet system and control method

Technical field

The invention relates to the field of ring network cabinets, in particular to an adjustable-speed screw rod lifting type buried ring network cabinet system and a control method.

Background technique

In order to overcome the problems of not occupying urban roads, green area, and not affecting the appearance of the city and pedestrian safety, the vertical lifting structure of the ring network cabinet is added to the ring network cabinet, so as to achieve a small floor area, and beautify the environment. The purpose of ensuring pedestrian safety.

The ring main unit is composed of a large number of precision electrical components and wire connections. Most of the lifting structure of the ring main unit is an emergency stop when starting and stopping. Over time, it will cause damage to the electrical components in the ring main unit. It will make the internal contact of the ring main unit poor and greatly shorten the service life of the ring main unit.

Summary of the invention

The purpose of the present invention is to provide an adjustable speed screw lifting type buried ring network system and a control method, which solves the problem that the lifting ring network cabinet will stop and start quickly when starting and stopping, and it will stop the ring network cabinet over time. Damage to the electrical components in the ring network cabinet will also make the internal contact of the ring main unit poor, greatly shortening the service life of the ring main unit.

In order to achieve the above objective, the present invention proposes the following technical solution: an adjustable-speed screw lifting type buried ring network cabinet system and control method, the system includes a ring network cabinet and a vertical lifting structure, the vertical lifting structure includes a screw rod Support frame, lifting bracket, guide wheel, guide track, screw, worm gear reducer and variable frequency motor;

The bottom end of the screw is fixedly connected to the bottom of the screw support frame, the internal thread of the worm wheel in the worm gear reducer is engaged with the screw, and the worm gear reducer is fixedly connected to the bottom of the lifting bracket, so The variable frequency motor is connected to the worm gear reducer through a coupling, the frequency converter is electrically connected to the variable frequency motor, the top of the lifting bracket is fixedly connected to the ring network cabinet, and the guide rail is fixedly connected to the screw support frame On both sides, the guide wheels are rotatably connected to both sides of the lifting bracket, and the lifting bracket is slidably arranged on the guide rail through the guide wheels.

Preferably, the screw support frame is a square structure welded by four square tubes.

Preferably, both sides of the bottom end of the screw support frame are fixedly connected with a first connecting plate, and the sides of the screw support frame are fixedly connected with a second connecting plate, the first connecting plate and the second connecting plate There are through holes on the top.

Preferably, the materials of the first connecting plate and the second connecting plate are both Q235B steel plates with a thickness of 20 mm.

Preferably, a third connecting plate is fixedly connected to the bottom of the lead screw, the third connecting plate is fixed to the bottom of the lead screw support frame by bolts, and the top of the lead screw is fixedly connected to a fourth connecting plate. The four connecting plates are fixed on the top of the screw rod support frame by bolts.

Preferably, the materials of the third connecting plate and the fourth connecting plate are both Q235B steel plates with a thickness of 16 mm.

Preferably, the lifting bracket is an L-shaped platform structure welded with a rectangular tube, and a channel steel oblique support is fixedly connected under the platform structure.

Preferably, the guide rail has a C-shaped bent plate structure.

The system realizes speed regulation and vertical lifting control:

1) Speed control

The frequency converter changes the motor speed by adjusting the frequency f. The frequency converter is composed of a rectifier part, an energy storage part, and an inverter part. When the system is energized, press the start button, the frequency converter is energized, and the rectifier in the rectification part of the frequency converter The AC integration with the receiving frequency of 50hz becomes DC, and the inverter in the inverter converts the DC into AC with the required frequency of 0-50hz; when the frequency changes, n=60f/p, and the speed will follow Change; where: n is the motor speed, f is the frequency, p is the number of magnetic pole pairs, p is determined by the motor itself, p=2;

When starting to run, the frequency converter will gradually increase the frequency from low to normal frequency 50hz, and the speed of the variable frequency motor will gradually increase from low to high to the rated speed. The speed of the ring network cabinet will gradually increase to the rated speed when it is raised; when it stops running When the power supply frequency is gradually reduced from the normal frequency of 50hz to zero under the control of the inverter, the rated speed of the variable frequency motor speed is gradually reduced to zero, so the speed of the ring network cabinet gradually decreases from the rated speed to zero when it is raised;

2) Vertical lift control

The frequency converter starts to make the frequency conversion motor rotate. The rotation of the frequency conversion motor controls the rotation of the worm in the worm gear reducer, which drives the rotation of the worm gear in the reducer; The machine does vertical lifting. Because the worm gear motor is fixed on the bottom surface of the lifting bracket, it drives the lifting bracket to vertically lift, and the ring network cabinet is fixed on the lifting bracket, so as to realize the buried and exposed of the ring network cabinet on the ground. on.

Beneficial effect

The technical solution of this application has the following technical effects:

1. The invention uses the screw rod, lifting bracket, worm gear reducer, frequency conversion motor and frequency converter to gradually increase and decrease the start and stop speed of the ring network cabinet in the vertical lifting, which can avoid When the ring main unit is raised and lowered vertically, the emergency stop and sudden rise will cause damage to the electrical components in the ring main unit, as well as the poor contact caused by the internal connection of the ring main unit, which makes the ring main unit more stable and prolongs the use of the ring main unit. Longevity, with strong practicability.

2. The adjustable-speed screw lifting type buried ring network cabinet of the present invention has a simple structure, is easy to manufacture and install, is not easy to be damaged, has strong practicability, and can be widely promoted.

It should be understood that all combinations of the foregoing concepts and the additional concepts described in more detail below can be regarded as part of the inventive subject matter of the present disclosure as long as such concepts are not mutually contradictory.

The foregoing and other aspects, embodiments and features of the teachings of the present invention can be more fully understood from the following description with reference to the accompanying drawings. Other additional aspects of the present invention, such as the features and/or beneficial effects of the exemplary embodiments, will be apparent in the following description, or learned from the practice of the specific embodiments taught in accordance with the present invention.

Description of the drawings

The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in each figure may be represented by the same reference numeral. For the sake of clarity, not every component is labeled in every figure. Now, the embodiments of various aspects of the present invention will be described through examples and with reference to the accompanying drawings, in which:

Figure 1 is a schematic diagram of the structure of the present invention.

Figure 2 is a schematic diagram of the three-dimensional structure of the present invention.

Figure 3 is a schematic perspective view of the present invention.

Figure 4 (a) is a schematic diagram of the present invention in a foundation pit when in use; (b) is a partial enlarged view of the frequency converter.

Figure 5 is a schematic diagram of the speed regulation principle of the frequency converter of the present invention.

In the figure, the meanings of the reference signs are as follows: 1. Screw support frame; 2. First connecting plate; 3. Second connecting plate; 4. Screw rod; 5. Third connecting plate; 6. Fourth connecting plate 7. Guide track; 8. Lifting bracket; 9. Guide wheel; 10. Worm gear reducer; 11. Frequency conversion motor; 12. Frequency converter; 13. Ring network cabinet; 14. Foundation pit cover; 15. Foundation Pit; 16 button; 17, rectifier; 18, inverter.

detailed description

In order to better understand the technical content of the present invention, specific embodiments are described below in conjunction with the accompanying drawings.

In this disclosure, various aspects of the present invention are described with reference to the accompanying drawings, in which numerous illustrated embodiments are shown. The embodiments of the present disclosure are not necessarily intended to include all aspects of the present invention. It should be understood that the various concepts and embodiments introduced above, as well as those described in more detail below, can be implemented in any of many ways, because the concepts and embodiments disclosed in the present invention are not Limited to any implementation. In addition, some aspects disclosed in the present invention can be used alone or in any appropriate combination with other aspects disclosed in the present invention.

As shown in Figure 1-4, an adjustable-speed screw lifting type buried ring main unit system includes a ring main unit 13 and a vertical lifting structure. The vertical lifting structure includes a screw support frame 1, a lifting bracket 8. , Guide wheel 9, guide track 7, screw 4, worm gear 10 and frequency conversion motor 11.

The bottom end of the screw 4 is fixedly connected to the bottom of the screw support frame 1, the internal thread of the worm in the worm gear reducer 10 is engaged with the screw 4, and the worm gear reducer 10 is fixedly connected to the lifting bracket At the bottom of the frame 8, the variable frequency motor 11 is connected to the worm gear reducer 10 through a coupling, the frequency converter 12 is connected to the variable frequency motor 11, and the top of the lifting bracket 8 is fixedly connected to the ring network cabinet 13, so The guide rails 7 are fixedly connected to both sides of the screw support frame 1, the guide wheels 9 are rotatably connected to both sides of the lifting platform 8, and the lifting platform 8 is slidably arranged on the guide rail 7 through the guide wheels 9 on.

In this embodiment, the bottom of the screw support frame 1 is fixedly connected to the bottom of the inner cavity of the foundation pit 15, and the top of the ring network cabinet 13 is fixedly connected to the foundation pit cover 14.

In this embodiment, the screw support frame 1 is a square structure welded by four square tubes.

In this embodiment, both sides of the bottom end of the screw support frame 1 are fixedly connected to the first connecting plate 2, and the side of the screw support frame 1 is fixedly connected to the first connecting plate 3, and the first connecting plate 3 is fixedly connected to the side of the screw support frame 1. Both the connecting plate 2 and the first connecting plate 3 are provided with through holes.

In this embodiment, the materials of the first connecting plate 2 and the first connecting plate 3 are both Q235B steel plates with a thickness of 20 mm.

In this embodiment, the bottom of the screw 4 is fixedly connected with a third connecting plate 5, the third connecting plate 5 is fixed to the bottom of the screw support frame 1 by bolts, and the top of the screw 4 is fixedly connected with The fourth connecting plate 6 is fixed on the top of the screw rod support frame 1 by bolts.

In this embodiment, the materials of the third connecting plate 5 and the fourth connecting plate 6 are both Q235B steel plates with a thickness of 16 mm.

In this embodiment, the lifting bracket is an L-shaped platform structure welded with a rectangular tube, and a channel steel oblique support is fixedly connected under the platform structure.

In this embodiment, the guide rail 7 has a C-shaped bent plate structure.

This system realizes vertical lifting control and speed regulation control:

1) Speed control

The frequency converter 12 adjusts the frequency f to change the motor speed. The frequency converter 12 is composed of a rectifier part, an energy storage part, and an inverter part. When the system is energized, press the start button 16, the frequency converter 12 is energized, and the frequency converter 12 is powered on. The rectifier 17 of the middle rectifier part integrates the AC with a receiving frequency of 50hz into DC, and then the inverter 18 in the frequency converter 12 converts the DC into AC with the required frequency of 0-50hz; when the frequency changes, n=60f /p, the speed changes accordingly; where: n is the motor speed, f is the frequency, p is the number of magnetic pole pairs, p is determined by the motor itself, p=2;

When starting to run, the frequency converter 12 will gradually increase the frequency from low to the normal frequency of 50hz, the speed of the variable frequency motor 11 will also gradually increase from low to high to the rated speed, and the speed of the ring network cabinet 13 will gradually increase to the rated speed when it is raised; When the operation is stopped, the power frequency is gradually reduced from the normal frequency of 50hz to zero under the control of the inverter 12, and the rated speed of the inverter motor 11 is gradually reduced to zero, so the speed of the ring network cabinet 13 gradually decreases from the rated speed when it is raised. Reduce to zero

2) Vertical lift control

The frequency converter 12 starts to make the frequency conversion motor 11 rotate, and the rotation of the frequency conversion motor 11 controls the rotation of the worm in the worm gear reducer 10, which drives the rotation of the worm wheel in the reducer; the internal thread of the worm gear in the worm gear reducer 10 meshes with the external thread of the screw 4 Therefore, the worm gear reducer 10 is driven to vertically lift. Since the worm gear motor 10 is fixed on the bottom surface of the lifting bracket, the lifting bracket is driven to vertically lift, and the ring network cabinet 13 is fixed on the lifting bracket to realize the ring net The cabinet 13 is buried and exposed on the ground.

The adjustable-speed screw lifting type buried ring main unit structure, in order to solve the lifting structure of the lifting type ring main unit, the emergency stop when starting and stopping will cause damage to the electrical components in the ring main unit 13 over time, causing damage to the electrical components in the ring main unit 13 The internal contact of the ring main unit 13 is poor. The speed-adjustable screw lift type buried ring main unit can make the start and stop speed of the ring main unit 13 in vertical lifting gradually increase and decrease, so as to avoid the ring main unit 13 from sudden stop during vertical lifting. The sudden rise causes damage to the electrical components in the ring main unit 13 and poor contact caused by the internal connection of the ring main unit 13. Moreover, the structure is simple, easy to manufacture and install, not easy to be damaged, strong in practicability, and can be widely promoted.

Although the present invention has been disclosed as above in preferred embodiments, it is not intended to limit the present invention. Those with ordinary knowledge in the technical field of the present invention can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to what is defined in the claims.

Claims

An adjustable-speed screw lifting type buried ring net cabinet system is characterized in that it comprises a ring net cabinet and a vertical lifting structure. The vertical lifting structure includes a screw support frame, a lifting bracket, a guide wheel, a guide rail, Screw, worm gear motor and variable frequency motor;

The bottom end of the screw is fixedly connected to the bottom of the screw support frame, the internal thread of the worm in the worm gear motor is engaged with the screw, and the worm gear reducer is fixedly connected to the bottom of the lifting bracket, so The variable frequency motor is connected to the worm gear reducer through a coupling, the frequency converter is connected to the variable frequency motor, the top of the lifting bracket is fixedly connected to the ring network cabinet, and the guide rail is fixedly connected to the two screw support frames. On the other hand, the guide wheels are rotatably connected to both sides of the lifting platform, and the lifting bracket is slidably arranged on the guide rail through the guide wheels.
The adjustable-speed screw lifting type buried ring network cabinet system according to claim 1, wherein the screw support frame is a square structure welded by four square pipes.
The adjustable-speed screw lifting type buried ring network cabinet system according to claim 2, characterized in that: both sides of the bottom end of the screw support frame are fixedly connected with a first connecting plate, and the screw The side of the support frame is fixedly connected with a second connecting plate, and both the first connecting plate and the second connecting plate are provided with through holes.
The adjustable-speed screw lifting type buried ring main unit system according to claim 3, wherein the material of the first connecting plate and the second connecting plate are both Q235B steel plates with a thickness of 20 mm.
The adjustable-speed screw lifting type buried ring network cabinet system according to claim 4, wherein the bottom of the screw is fixedly connected with a third connecting plate, and the third connecting plate is fixed by bolts. At the bottom of the screw support frame, the top of the screw is fixedly connected with a fourth connecting plate, and the fourth connection plate is fixed on the top of the screw support frame by bolts.
The adjustable-speed screw lifting type buried ring main unit system according to claim 5, wherein the material of the third connecting plate and the fourth connecting plate are both Q235B steel plates with a thickness of 16 mm.
The adjustable-speed screw lifting type buried ring main unit system according to claim 6, wherein the lifting bracket is an L-shaped platform structure welded with a rectangular tube, and the platform structure is Channel steel oblique support is fixedly connected below.
The adjustable-speed screw lifting type buried ring network cabinet system according to claim 7, wherein the guide rail is a C-shaped bent plate structure.
The system control method of the lifting type buried ring main unit according to claim 1, wherein the system realizes speed regulation and vertical lifting control:

1) Speed control

The frequency converter changes the motor speed by adjusting the frequency f. The frequency converter is composed of a rectifier part, an energy storage part, and an inverter part. When the system is energized, press the start button, the frequency converter is energized, and the rectifier in the rectification part of the frequency converter The AC integration with the receiving frequency of 50hz becomes DC, and the inverter in the inverter converts the DC into AC with the required frequency of 0-50hz; when the frequency changes, n=60f/p, and the speed will follow Change; where: n is the motor speed, f is the frequency, p is the number of magnetic pole pairs, p is determined by the motor itself, p=2;

When starting to run, the frequency converter will gradually increase the frequency from low to normal frequency 50hz, and the speed of the variable frequency motor will gradually increase from low to high to the rated speed. The speed of the ring network cabinet will gradually increase to the rated speed when it is raised; when it stops running When the power supply frequency is gradually reduced from the normal frequency of 50hz to zero under the control of the inverter, the rated speed of the variable frequency motor speed is gradually reduced to zero, so the speed of the ring network cabinet gradually decreases from the rated speed to zero when it is raised;

2) Vertical lift control

The frequency converter starts to make the frequency conversion motor rotate. The rotation of the frequency conversion motor controls the rotation of the worm in the worm gear reducer, which drives the rotation of the worm gear in the reducer; The machine does vertical lifting. Because the worm gear motor is fixed on the bottom surface of the lifting bracket, it drives the lifting bracket to vertically lift, and the ring network cabinet is fixed on the lifting bracket, so as to realize the buried and exposed of the ring network cabinet on the ground. on.