CN211871243U - Lifting device for oil drilling machine based on alternating-current variable-frequency electric winch - Google Patents
Lifting device for oil drilling machine based on alternating-current variable-frequency electric winch Download PDFInfo
- Publication number
- CN211871243U CN211871243U CN202020244755.7U CN202020244755U CN211871243U CN 211871243 U CN211871243 U CN 211871243U CN 202020244755 U CN202020244755 U CN 202020244755U CN 211871243 U CN211871243 U CN 211871243U
- Authority
- CN
- China
- Prior art keywords
- frequency
- winch
- alternating
- cabinet
- control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Earth Drilling (AREA)
Abstract
The utility model discloses a lifting device for an oil drilling machine based on an alternating-current variable-frequency electric winch, which comprises a variable-frequency electric control assembly, a winch main body and a control switch; a frequency converter, a temperature controller, an electric heater and a control loop unit are arranged in a control cabinet at the upper part of the variable-frequency electric control assembly; and a brake resistor is arranged in the resistor cabinet below the control cabinet. The winch main body comprises an alternating current variable frequency brake motor, a planetary reducer and a winding drum body, wherein the alternating current variable frequency brake motor, the planetary reducer and the winding drum body are sequentially and coaxially connected and are arranged on a winch frame, the winding drum body is used for winding a steel wire rope, an automatic rope arranging device is arranged on the upper side of the winch frame, and a rope pressing device is arranged on the rope outlet side of the winch frame. The utility model combines the frequency conversion electric control component and the AC frequency conversion brake motor to realize the purpose of 'energy consumption brake'; the utility model discloses the device has convenient operation, safe and reliable, and speed control is accurate, and the transmission is steady, and the energy consumption is low, and is efficient, can satisfy advantages such as wide region's operation requirement including the severe cold district.
Description
Technical Field
The utility model relates to an oil drilling, mechanical equipment technical field especially relate to a hoisting device for oil-well rig based on exchange frequency conversion electric winch.
Background
In the oil field drilling operation, tools such as a pneumatic/hydraulic winch and the like are commonly used for hoisting operation at present; the existing pneumatic/hydraulic winches have the following disadvantages: 1) in the transmission process, because energy needs to be converted twice, pressure loss, volume loss and mechanical friction loss exist, and the total efficiency is low; 2) whether the heavy object is lifted or put down, a pneumatic/hydraulic winch is required to be used as a power machine to output energy, so that the energy consumption is high; 3) the gas/liquid has certain compressibility, inevitable leakage exists on the matching surface, the strict transmission ratio cannot be ensured, the transmission precision is poor, and the energy consumption is high. 4) The working performance and efficiency of the pneumatic/hydraulic transmission system are greatly affected by temperature, and the working performance is poor in a high-temperature or low-temperature environment. When the temperature is low, the air pressure transmission (compressed air) is easy to generate the conditions of condensation and even freezing, thereby causing the blockage and damage of equipment; the hydraulic transmission (hydraulic oil) has large viscosity, poor fluidity and low efficiency. Especially, in the alpine region, such as the Russia and the middle Asia part, the use requirement of the local environment is difficult to meet.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art and provide a lifting device for an oil drilling machine based on an alternating-current variable-frequency electric winch, which has the advantages of convenient operation, safety, reliability, accurate speed control and stable transmission; low energy consumption and high efficiency, and can meet the use requirements of wide areas including alpine regions.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a lifting device for an oil drilling machine based on an alternating-current variable-frequency electric winch comprises a variable-frequency electric control assembly, a winch main body and a control switch, wherein the variable-frequency electric control assembly is respectively connected with the winch main body and the control switch through cables; the variable-frequency electric control assembly comprises a control cabinet, a resistor cabinet, a frequency converter, a control loop unit instrument switch and a brake resistor, wherein the frequency converter is arranged in the control cabinet, the instrument switch is arranged on a front panel of the control cabinet, the resistor cabinet is arranged below the control cabinet, the brake resistor is arranged on the resistor cabinet, and the frequency converter is electrically connected with the instrument switch through the control loop unit; the winch main body comprises an alternating-current variable-frequency brake motor, a planetary reducer, a winch frame, a winding drum, an automatic rope arranger, a rope pressing device and an installation support, wherein the alternating-current variable-frequency brake motor, the planetary reducer and the winding drum body are sequentially and coaxially connected and installed on the winch frame; the automatic rope guider is arranged on the upper side of the winch frame, the rope pressing device is arranged on the rope outlet side of the winch frame, and the winch main body is connected with external equipment through the mounting support.
The utility model discloses a converter among the automatically controlled subassembly of control switch control frequency conversion, parts such as control circuit unit, the automatically controlled subassembly of frequency conversion passes through the cable and is connected together with exchanging variable frequency brake motor, provide variable frequency power supply for exchanging variable frequency brake motor through control switch control converter rethread control circuit unit, drive exchanges variable frequency brake motor, and then drive planetary reducer in proper order, the reel body is rotatory, make the reel body realize twining or loosen wire rope, and then realize the promotion or the transfer to the heavy object. The frequency conversion electric control assembly and the alternating current frequency conversion brake motor are combined with each other to realize energy consumption braking, namely, when braking is carried out, the alternating current frequency conversion brake motor is converted from a motor state to a generator state, mechanical energy of a load is converted into heat, and the heat is dissipated to the environment through the brake resistor, so that the purpose of braking is achieved, and energy conservation and consumption reduction are achieved.
Preferably, the control switch, the control cabinet, the resistance cabinet and the alternating current variable frequency brake motor are explosion-proof elements, so that the aim of explosion prevention is fulfilled.
Further preferably, the variable-frequency electric control assembly further comprises a temperature controller, an electric heater and a cooling fan, the temperature controller is connected with the electric heater and the cooling fan through a control loop unit, the temperature controller controls the electric heater and the cooling fan through the control loop unit, the temperature controller is electrically connected with the instrument switch through the control loop unit, the temperature controller, the electric heater and the control loop unit are installed in the control cabinet, and the cooling fan is arranged at the lower part of the resistance cabinet.
Further preferably, a second cooling fin is installed at a position, corresponding to the frequency converter, of the back of the control cabinet, and a first cooling fin is installed at a position, corresponding to the brake resistor, of the back of the resistor cabinet; and heat dissipation air ducts are arranged at the back parts of the control cabinet and the resistance cabinet.
The temperature controller is connected with the electric heater and the cooling fan through the control loop unit, is used for detecting the real-time temperature in the explosion-proof control cabinet, and can automatically start the electric heater through the control loop unit when the temperature is too low and automatically stop heating when the temperature reaches a set value; when the temperature is too high, the temperature controller can control the loop unit to enable the cooling fan to be automatically started, and when the temperature is lower than a set value, the cooling fan is automatically stopped. The automatic control of the temperature controller to the electric heater and the cooling fan ensures that the frequency converter is always in a proper temperature environment to meet the use requirements of different high-temperature and low-temperature environments such as deserts, polar regions and the like.
All non-explosion-proof electrical elements of the variable-frequency electric control assembly of the utility model are packaged in the explosion-proof cabinet body, so as to meet the use requirements of the explosion-proof area of the oil rig; meanwhile, according to different requirements, when the variable-frequency electric control assembly is placed in a non-explosion-proof area, if the variable-frequency electric control assembly is placed in an air-conditioning constant-temperature electric control room of an oil drilling machine, the cabinet body can be of a non-explosion-proof structure, and heating and heat dissipation devices can be omitted.
Preferably, the number of the braking resistors (108) is M, and M is more than or equal to 1.
Preferably, the reel body is provided with a belt brake on the outer side, and the belt brake can be a manual belt brake or an automatic belt brake.
The power of the automatic rope arranger comes from the winding drum body, and the automatic rope arranger moves by a distance of one equivalent diameter of the steel wire rope every time the steel wire rope is wound on the winding drum body.
The rope pressing device compresses the steel wire rope all the time under the action of the spring force, avoids rope loosening of the steel wire rope under the no-load rope releasing working condition and rope riding under the rope winding working condition, and is matched with the automatic rope arranging device, so that the rope arranging effect is better.
The mounting bracket is connected with the external equipment in any one of T-shaped buckle connection, flange connection or pin shaft connection.
The beneficial effects of the utility model reside in that: the utility model adopts the frequency conversion electric control component (frequency converter) to directly drive the AC variable frequency motor, has high energy conversion rate, accurate control, stable transmission, obvious energy saving and consumption reduction effects, and can meet the use requirements of wide areas including alpine regions; this hoisting device adopts triple brake: 1) the energy-consuming brake of the motor is used as a main brake, 2) the disc brake of the motor, namely an electromagnetic power-off brake, is used as an auxiliary brake, 3) the belt brake of the roller body is used as an emergency brake, and the reliable brake and the safe work of the winch can be ensured through the linkage control of triple brakes; the utility model adopts electric energy to drive directly, reduces the intermediate conversion links of the traditional pneumatic winch and hydraulic winch, and greatly improves the efficiency; the motor dynamic braking is used as a main brake, and when the winch is braked, the motor is converted into the generator to convert the loaded mechanical energy into the energy required by the braking, so that the energy required by the braking of the winch is extremely low, and the energy consumption is greatly saved.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a front view of the variable frequency electric control assembly of the present invention.
Fig. 3 is a side view of the variable frequency electric control assembly of the utility model.
Fig. 4 is a structural view of the winch main body of the present invention.
Fig. 5 is a side view of the winch body of the present invention.
Fig. 6 is a schematic diagram of the circuit connection of the present invention.
Wherein: 1-variable frequency electric control component, 101-explosion-proof control cabinet, 102-explosion-proof resistance cabinet, 103-frequency converter, 104-temperature controller, 105-electric heater, 106-control loop unit, 107-instrument switch, 108-heat dissipation resistor, 109-explosion-proof heat dissipation fan, 110 first heat dissipation fin, 111-heat dissipation air duct, 112 second heat dissipation fin, 2-winch main body, 201-explosion-proof alternating current variable frequency brake motor, 202-planetary reducer, 203-winch frame, 204-winding drum body, 205-automatic rope arranger, 206-belt brake, 207-rope press, 208-mounting bracket and 3-explosion-proof control switch.
Detailed Description
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other; the specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments; based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the embodiment, as shown in fig. 1 and 6, the hoisting device for the oil drilling rig based on the alternating-current variable-frequency electric winch comprises a variable-frequency electric control assembly 1, a winch main body 2 and an explosion-proof control switch 3, wherein the variable-frequency electric control assembly 1 is respectively connected with the winch main body 2 and the explosion-proof control switch 3 through cables, the hoisting device controls components such as a frequency converter 103, a control loop 106 and the like in the variable-frequency electric control assembly 1 through the explosion-proof control switch 3, outputs alternating-current variable-frequency electricity, drives an explosion-proof alternating-current variable-frequency brake motor 201, further sequentially drives a planetary reducer 202 and a winding drum body 204 to rotate, and prompts the winding drum body 204 to wind and loosen a steel wire rope, so as to realize. The variable-frequency electric control assembly 1 and the explosion-proof alternating-current variable-frequency brake motor 201 are combined with each other to realize energy consumption braking, namely, when braking is carried out, the explosion-proof alternating-current variable-frequency brake motor 201 is converted from a motor state to a generator state, mechanical energy of a load is converted into heat, and the heat is dissipated to the environment through a brake resistor, so that the purpose of braking is achieved, and energy conservation and consumption reduction are achieved.
As shown in fig. 2, 3 and 6: the variable-frequency electric control assembly 1 comprises an explosion-proof control cabinet 101, an explosion-proof resistance cabinet 102, a frequency converter 103, a temperature controller 104, an electric heater 105, a control loop unit 106, an instrument switch 107, a heat dissipation resistor 108, an explosion-proof heat dissipation fan 109, a first heat dissipation fin 110, a heat dissipation air channel 111 and a second heat dissipation fin 112; the frequency converter 103, the temperature controller 104, the electric heater 105 and the control loop unit 106 are installed in the cabinet body of the explosion-proof control cabinet 101, the instrument switch 107 is installed on the front panel of the explosion-proof control cabinet 101, and the second heat sink 112 is installed at the position, corresponding to the frequency converter 103, on the back surface of the explosion-proof control cabinet 101; the explosion-proof resistance cabinet 102 is arranged below the explosion-proof control cabinet 101, the heat dissipation resistor 108 is arranged in the explosion-proof resistance cabinet 102, and the first heat dissipation fin 110 is arranged at the position, corresponding to the heat dissipation resistor 108, on the back surface of the explosion-proof resistance cabinet 102; the back parts of the explosion-proof control cabinet 101 and the explosion-proof resistance cabinet 102 are provided with the heat dissipation air duct 111, and the lower part of the explosion-proof resistance cabinet 102 is provided with the heat dissipation fan 109.
The frequency converter 103, the temperature controller 104, the electric heater 105 and the control loop unit 106 are arranged in the explosion-proof control cabinet 101 and isolated from the outside, so that the aim of explosion prevention is fulfilled;
the temperature controller 104 is connected with the electric heater 105 and the explosion-proof cooling fan 109 through the control loop unit 106, the temperature controller 104 is used for detecting the real-time temperature of the interior 101 of the explosion-proof control cabinet, when the temperature is too low, the electric heater 105 can be controlled to automatically start through the control loop unit 106, and when the temperature reaches a set value, the heating is automatically stopped; when the temperature is too high, the temperature controller 104 can control the anti-explosion cooling fan 109 to automatically start through the control loop unit 106, and automatically stop when the temperature is lower than a set value. The temperature controller 104 automatically controls the electric heater 105 and the cooling fan 109, so that the frequency converter 103 is always in a suitable temperature environment to meet the use requirements of different high-temperature and low-temperature environments such as deserts, polar regions and the like.
The braking resistor 108 is installed in the explosion-proof resistor cabinet 102, and is isolated from the outside, so that the purpose of explosion prevention is achieved.
A second cooling fin 112 is arranged at the position, corresponding to the frequency converter 103, on the back surface of the explosion-proof control cabinet 101, so that heat generated in the operation of the electric control system is effectively transferred to the outside of the cabinet body; a first cooling fin 110 is arranged on the back surface of the explosion-proof resistor cabinet 102 corresponding to the position of the brake resistor 108, so that heat generated by the brake resistor 108 is effectively transferred to the outside of the cabinet body; the heat dissipation air duct 111 arranged at the back of the body cabinet and the heat dissipation fan 109 arranged at the lower part of the explosion-proof resistance cabinet 102 blow away heat on the heat dissipation fins in time, so that the heat dissipation effect is enhanced.
The control switch 3 and the alternating current variable frequency brake motor 201 are explosion-proof elements so as to meet the use requirement of an explosion-proof area of the oil rig; all non-explosion-proof electrical elements of the variable-frequency electronic control assembly 1 are packaged in an explosion-proof cabinet body so as to meet the use requirement of an explosion-proof area of the oil drilling machine; meanwhile, according to different requirements, when the variable-frequency electric control assembly 1 is placed in a non-explosion-proof area, if the variable-frequency electric control assembly is placed in an air-conditioning constant-temperature electric control room of an oil drilling machine, the cabinet body can be of a non-explosion-proof structure, and heating and heat dissipation devices can be omitted.
As shown in fig. 4 and 5: the winch main body 2 comprises an explosion-proof alternating current variable frequency brake motor 201, a planetary reducer 202, a winch frame 203, a winding drum body 204, an automatic rope arranger 205, a belt brake 206, a rope pressing device 207 and a mounting bracket 208. The explosion-proof alternating current variable frequency brake motor 201, the planetary reducer 202 and the drum body 204 are sequentially and coaxially connected and installed on the winch frame 203; the automatic rope guider 205 is installed on the upper side of the winch frame 203, and the rope pressing device 207 is installed on the rope outlet side of the winch frame 203; a belt brake 206 is arranged outside the winding drum body 204; the winch body 2 is connected to an external device through the mounting bracket 208.
The explosion-proof alternating current variable frequency brake motor 201, the planetary reducer 202 and the winding drum body 204 are of a coaxial structure, and are simple in structure and convenient to maintain.
The automatic rope arranger 205 is arranged on the upper side of the winch frame 203, the power of the automatic rope arranger comes from the winding drum body 204, and the automatic rope arranger 205 moves for a distance of one equivalent diameter of the steel wire rope every time the steel wire rope is wound on the winding drum body 204 by setting a proper transmission ratio, so that the rope arrangement is ensured to be orderly.
Rope pressing device 207 is still installed to the play rope one side of barrel 204, rope pressing device 207 compresses tightly wire rope all the time under the effect of spring force, avoids wire rope "the rope looseness" under the no-load rope release operating mode and "ride the rope" under the rope kinking operating mode, cooperates with automatic rope arranger 205 for the rope arrangement effect is better.
The winch main body 2 is connected with external equipment through the mounting bracket 208, and the mounting bracket 208 is connected in any one of a T-shaped buckle connection mode, a flange connection mode or a pin shaft connection mode.
The outside of the winding drum body 204 is also provided with a belt brake 206 for realizing the emergency brake function, and the belt brake 206 can be a manual belt brake or an automatic belt brake, so as to meet the requirements of different working conditions.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the principles of the present invention.
Claims (9)
1. The utility model provides a hoisting device for oil-well rig based on exchange frequency conversion electric winch which characterized in that: the winch comprises a variable frequency electric control assembly (1), a winch main body (2) and a control switch (3), wherein the variable frequency electric control assembly (1) is respectively connected with the winch main body (2) and the control switch (3) through cables; the frequency conversion electric control assembly (1) comprises a control cabinet (101), a resistor cabinet (102), a frequency converter (103), a control loop unit (106), an instrument switch (107) and a brake resistor (108), wherein the frequency converter (103) is installed in the control cabinet (101), the instrument switch (107) is installed on a front panel of the control cabinet (101), the resistor cabinet (102) is arranged below the control cabinet (101), the brake resistor (108) is arranged on the resistor cabinet (102), and the frequency converter (103) is electrically connected with the instrument switch (107) through the control loop unit (106); the winch main body comprises an alternating-current variable-frequency brake motor (201), a planetary speed reducer (202), a winch frame (203), a winding drum body (204), an automatic rope arranger (205), a rope pressing device (207) and an installation support (208), wherein the alternating-current variable-frequency brake motor (201), the planetary speed reducer (202) and the winding drum body (204) are sequentially and coaxially connected and installed on the winch frame (203); the automatic rope guider (205) is installed on the upper side of the winch frame (203), the rope pressing device (207) is installed on the rope outlet side of the winch frame (203), the winch main body (2) is connected with external equipment through the installation support (208), and the alternating-current variable-frequency brake motor (201) provides variable-frequency current through the control loop unit (106).
2. The lifting device for the oil drilling machine based on the alternating-current variable-frequency electric winch, according to claim 1, is characterized in that: the control switch (3), the control cabinet (101), the resistance cabinet (102) and the alternating current variable frequency brake motor (201) are explosion-proof elements.
3. The lifting device for the oil drilling machine based on the alternating-current variable-frequency electric winch, according to claim 1 or 2, is characterized in that: the variable-frequency electric control assembly (1) further comprises a temperature controller (104), an electric heater (105) and a cooling fan (109), wherein the temperature controller (104) is connected with the electric heater (105) and the cooling fan (109) through a control loop unit (106), the temperature controller (104) controls the electric heater (105) and the cooling fan (109) through the control loop unit (106), the temperature controller (104) is electrically connected with an instrument switch (107) through the control loop unit (106), the temperature controller (104), the electric heater (105) and the control loop unit (106) are installed in a control cabinet (101), and the cooling fan (109) is arranged at the lower part of the resistance cabinet (102).
4. The lifting device for the oil drilling machine based on the alternating-current variable-frequency electric winch, according to claim 3, is characterized in that: a second radiating fin (112) is arranged at the position, corresponding to the frequency converter (103), of the back surface of the control cabinet (101), and a first radiating fin (110) is arranged at the position, corresponding to the brake resistor (108), of the back surface of the resistor cabinet (102); and heat dissipation air ducts (111) are arranged at the back parts of the control cabinet (101) and the resistor cabinet (102).
5. The lifting device for the oil drilling machine based on the alternating-current variable-frequency electric winch, according to claim 3, is characterized in that: the heat radiation fan (109) is an explosion-proof element.
6. The lifting device for the oil drilling machine based on the alternating-current variable-frequency electric winch, according to claim 3, is characterized in that: the number of the braking resistors (108) is M, and M is larger than or equal to 1.
7. The lifting device for the oil drilling machine based on the alternating-current variable-frequency electric winch, according to claim 1, is characterized in that: the outside of the winding drum body (204) is provided with a belt brake (206), and the belt brake (206) is a manual belt brake or an automatic belt brake.
8. The lifting device for the oil drilling machine based on the alternating-current variable-frequency electric winch, according to claim 1, is characterized in that: the power of the automatic rope guider (205) comes from the winding drum body (204), and the automatic rope guider (205) moves for a distance of one equivalent diameter of the steel wire rope every time the steel wire rope is wound on the winding drum body (204).
9. The lifting device for the oil drilling machine based on the alternating-current variable-frequency electric winch, according to claim 1, is characterized in that: the mounting bracket (208) and the external equipment are connected in any one of T-shaped buckle connection, flange connection or pin shaft connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020244755.7U CN211871243U (en) | 2020-03-03 | 2020-03-03 | Lifting device for oil drilling machine based on alternating-current variable-frequency electric winch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020244755.7U CN211871243U (en) | 2020-03-03 | 2020-03-03 | Lifting device for oil drilling machine based on alternating-current variable-frequency electric winch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211871243U true CN211871243U (en) | 2020-11-06 |
Family
ID=73254524
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020244755.7U Active CN211871243U (en) | 2020-03-03 | 2020-03-03 | Lifting device for oil drilling machine based on alternating-current variable-frequency electric winch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211871243U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111056471A (en) * | 2020-03-03 | 2020-04-24 | 宝鸡巨菱钻采设备有限责任公司 | Lifting device for oil drilling machine based on alternating-current variable-frequency electric winch |
-
2020
- 2020-03-03 CN CN202020244755.7U patent/CN211871243U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111056471A (en) * | 2020-03-03 | 2020-04-24 | 宝鸡巨菱钻采设备有限责任公司 | Lifting device for oil drilling machine based on alternating-current variable-frequency electric winch |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN211871243U (en) | Lifting device for oil drilling machine based on alternating-current variable-frequency electric winch | |
| CN111056471A (en) | Lifting device for oil drilling machine based on alternating-current variable-frequency electric winch | |
| WO2019127097A1 (en) | High-power electromagnetic speed regulating motor | |
| CN212450400U (en) | Manned carrying electric winch for oil drilling machine | |
| CN102545776A (en) | Variable frequency control circuit and control method for electric hoist | |
| CN108974371B (en) | Airplane surplus hydraulic energy storage and utilization system and method | |
| CN202550458U (en) | Electric wire unreeling frame | |
| CN109573746B (en) | Mooring unmanned aerial vehicle power unit built-in cable winding and unwinding equipment | |
| CN203143882U (en) | Elevator with energy feedback function | |
| CN209702170U (en) | A kind of oil-well rig AC frequency modulation electric hoister | |
| CN109823975A (en) | A kind of oil-well rig AC frequency modulation electric hoister | |
| CN108639985B (en) | Efficient composite brake mode alternating-current variable-frequency winch and lowering control method thereof | |
| CN111776969A (en) | Manned carrying electric winch for oil drilling machine | |
| CN216904386U (en) | Energy-saving power generation device for elevator | |
| CN216711464U (en) | Integral type manned year thing electric winch | |
| CN203451143U (en) | Electric variable-frequency constant-tension mooring winch | |
| CN214476859U (en) | Oil-immersed transformer with stirring structure | |
| WO2022100152A1 (en) | Quick braking method for dam accident door | |
| CN205575445U (en) | Pneumatic disk brake control system of special water -cooling based on high -efficient frequency conversion winch | |
| CN114233578A (en) | Wind power generation device convenient for operating and installing by workers | |
| CN2645333Y (en) | Mining explosion-proof frequency conversion electric controller | |
| WO2019091213A1 (en) | Heat dissipation device for traction machine | |
| CN201747650U (en) | Air blower frequency-conversion control device used in wheat flour production workshop | |
| CN213877712U (en) | Suspension type brake resistor cabinet for direct-current pure electric small train | |
| CN111029091A (en) | Heat dissipation device for bladeless fan transformer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |