CN210768647U - Hydraulic workover rig - Google Patents
Hydraulic workover rig Download PDFInfo
- Publication number
- CN210768647U CN210768647U CN201921340251.9U CN201921340251U CN210768647U CN 210768647 U CN210768647 U CN 210768647U CN 201921340251 U CN201921340251 U CN 201921340251U CN 210768647 U CN210768647 U CN 210768647U
- Authority
- CN
- China
- Prior art keywords
- module
- hydraulic
- oil
- workover
- workover rig
- 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
- Forklifts And Lifting Vehicles (AREA)
Abstract
The utility model relates to a hydraulic pressure workover rig, including workover hoist module, swabbing module, hydraulic winch module for the power module that workover hoist module, swabbing module and hydraulic winch module provided power, be used for controlling the control module of workover hoist module, swabbing module, hydraulic winch module and power module action, and be used for supporting the landing leg module and the unit structure module of above-mentioned module. The utility model realizes two working modes of workover and swabbing operation through the up-and-down lifting movement of the hydraulic oil cylinder, replaces the roller, the derrick and the roller braking system of the traditional workover rig, and adopts the electric and hydraulic transmission and control modes to meet the increasingly strict environmental protection requirement; and, the utility model provides a workover rig still has following advantage: the overhead traveling crane has the advantages of no overhead traveling crane risk, high transmission efficiency, convenient transportation, simple structure, low replacement and maintenance cost, short operation preparation time, high lifting speed, few mechanical transmission parts and capability of basically eliminating the problems of running, falling, dripping and leaking.
Description
Technical Field
The utility model relates to an underground oil gas is adopted and is swabbed equipment, especially relates to a hydraulic workover rig.
Background
Workover and pumping are the main processes of the downhole operation of the oil field, and workover rig is the main operation equipment for workover and pumping at present. The traditional workover rig mainly adopts the working form of roller-derrick-crown block-traveling block, firstly, the power of an engine or a motor is transmitted to the roller through a speed changer, a transfer case, a transmission shaft, an angle transmission case and the like, and the roller can realize the lifting and lowering actions in the workover by matching with the derrick, the crown block, the traveling block and the like, and does not have the function of automatic pumping. The working and transmission mode has the advantages of complex structure, complex operation and control, poor safety, easy occurrence of up-down collision and smashing accidents, low working efficiency and power utilization efficiency, large consumption of fuel oil and steel wire ropes, complex operation preparation process, high moving and maintenance cost, serious leakage problems and no automatic pumping function.
Although a small part of the existing workover rigs adopt a single hydraulic cylinder to lift and lower to realize operation, the technology is still immature, and the large hook also shakes along with the irregular rotation of the single hydraulic cylinder in the work, so that the work difficulty and danger are increased. And the workover rig of single hydraulic cylinder promotes power not enough, the speed is low, does not have automatic pumping function, can't satisfy the requirement that the oil field operation improves gradually.
According to the current situation of above-mentioned workover rig, on the basis that combines market research, the utility model develops a hydraulic workover rig.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's not enough, provide a motion through hydraulic cylinder is carried from top to bottom and is realized the hydraulic pressure workover rig of workover and swabbing operation.
The utility model discloses a hydraulic pressure workover rig, its technical scheme is:
the system comprises a well workover hoisting module, a pumping module, a hydraulic winch module, a power module for providing power for the well workover hoisting module, the pumping module and the hydraulic winch module, a control module for controlling the actions of the well workover hoisting module, the pumping module, the hydraulic winch module and the power module, and a supporting leg module and a unit structure module for supporting the well workover hoisting module, the pumping module, the hydraulic winch module, the power module and the control module.
The utility model provides a pair of hydraulic workover rig still includes following subsidiary technical scheme:
the power module comprises a power source, a transfer case, an oil pump and a radiator, the power source transmits kinetic energy to the oil pump through the transfer case, and the oil pump outputs hydraulic energy and flow to the control module and the swabbing module.
The control module comprises a valve group, a sensor, an instrument, a pipeline and an electric control module; the electric control module is used for distributing hydraulic energy and flow output by the power module through a preset working logic relation and is also used for controlling the sensor to realize the action of the pumping module.
The workover hoist module comprises an outer sliding frame and an inner sliding frame, the inner sliding frame is driven to slide along a hydraulic oil cylinder of the outer sliding frame and a sliding trolley capable of sliding on the inner sliding frame, a pulley block is arranged at the top of the inner sliding frame, a steel wire rope is arranged on the pulley block, a fixing frame is arranged on the outer sliding frame, one end of the steel wire rope is fixed on the fixing frame, the other end of the steel wire rope is fixed on the sliding trolley, and an oil rod component fixing head is arranged on the sliding trolley.
Wherein the pumping module and the workover hoisting module share a set of mechanical structure.
The swabbing module also comprises a limit switch for controlling the lifting and lowering actions of the hydraulic oil cylinder; when the inner sliding frame moves upwards to a lower set point of the limit switch, the limit switch automatically sends an instruction to the control module, and the control module switches oil working modes of an oil inlet and an oil return port of the hydraulic oil cylinder mutually, namely the oil inlet changes into oil and the oil return port changes into oil, so that the oil cylinder moves downwards; when the inner sliding frame moves downwards to the upper set point of the limit switch, the limit switch automatically sends an instruction to the control module, and the control module switches the working modes of oil in the oil inlet and the oil return port of the hydraulic oil cylinder mutually, namely the oil inlet is changed into oil, the oil return port is changed into oil return, so that the oil cylinder moves upwards, and the operation is repeated in a circulating mode to realize the automatic swabbing function.
The hydraulic winch module comprises a hydraulic winch, a steel wire rope, an arm support, a pulley block and a hook; the hydraulic winch is driven to rotate by hydraulic oil in the oil cylinder and drives the steel wire rope, the pulley block and the lifting hook to move mutually so as to realize the up-and-down movement of the hung object.
The supporting leg module comprises an oil cylinder and inner and outer telescopic supporting legs; and hydraulic oil in the oil cylinder drives the inner telescopic supporting leg and the outer telescopic supporting leg to move so as to adjust the working width and the working height of the workover rig.
The unit structure module comprises a frame, a hydraulic oil tank, a fuel tank and a battery pack, a protective cover is arranged around the frame, and the swabbing module, the power module, the control module and the support leg module are all arranged on the frame.
Wherein the power source is an electric motor and/or a diesel engine.
The utility model discloses an implement including following technological effect:
the utility model provides a hydraulic workover rig, through the motion that hydraulic cylinder carried the putting up and down realize workover and swabbing operation, replace cylinder, derrick and cylinder braking system of traditional workover rig to adopt electricity, hydraulic drive and control, this kind of transmission and control mode has complied with the trend of current mainstream equipment technical development, accords with the environmental protection requirement that is stricter day by day; the utility model provides a hydraulic workover rig has two modes of workover and swabbing.
The working process of the workover mode of operation: the working mode is set to the workover working mode through the control console, then the up-and-down movement of the lifting oil cylinder is realized by controlling the operating handle, the gear shifting problem and the load problem do not need to be considered in the whole workover process, the lifting system can automatically lift the load according to the load, only one operating handle related to the workover work is arranged on the control console, the upward pushing is oil cylinder lifting, corresponding oil pipe lifting action, the downward pulling is oil cylinder lowering, corresponding oil pipe lowering action, the speed of the oil cylinder movement can be controlled by an operator by controlling the opening size of the operating handle, and the operation is very simple.
The process of the automatic pumping mode of operation: the automatic pumping operation is automatically completed by the system, an operator is not required to operate, the operator only needs to set the working mode of the console to the automatic pumping working mode at first, and then presses the start button, so that the equipment can automatically realize the up-and-down movement of the lifting oil cylinder.
The utility model provides a workover rig still has following advantage:
1. is safe and reliable. The workover rig in the utility model realizes the movement by the pushing of the oil cylinder in the lifting and lowering processes, so the workover rig has no risk of jacking the crown block;
2. the economy is high. The workover rig has the advantages of high transmission efficiency, fuel saving, little consumption of steel wire ropes, no guy ropes, convenient lifting and collecting and transportation, low moving cost, simple system structure, low replacement of accessories and maintenance cost;
3. the working efficiency is high. The utility model has the advantages that the operation preparation time of the workover rig is greatly shortened, and the lifting speed is high;
4. is environment-friendly. The workover rig has high efficiency, less discharge and less mechanical transmission parts, and basically eliminates the problems of leakage, overflow and drip;
5. the operation is simple and convenient. The workover rig of the utility model realizes stepless speed change, the workover operation is realized through a handle, and the swabbing operation is automatic;
6. a dual pressure system. The workover rig of the utility model works in a low-pressure state at ordinary times, and is switched to a high-pressure state to be unlocked when the workover rig encounters jamming;
7. the service life is long. The workover rig has the advantages of simple structure, modularization, low failure rate and convenient maintenance;
8. automatic and continuous pumping function. The utility model provides a workover rig need not to change equipment and can carry out automatic continuous area pressure pumping operation after putting the sucker rod down to stroke and speed about the control sucker rod that can be accurate when reaching the pumping environmental protection requirement, the actual oil production operation has accurately been simulated, and very big manpower, material resources, financial resources and time of having saved.
Drawings
Fig. 1 is a schematic structural view of a hydraulic workover rig according to the present invention.
Fig. 2 is a schematic structural view of an inner carriage of the hydraulic workover rig of the present invention.
Fig. 3 is a schematic structural view of an outer carriage of the hydraulic workover rig of the present invention.
Fig. 4 is a schematic structural diagram of the combination of the inner carriage and the outer carriage of the hydraulic workover rig of the present invention.
Fig. 5 is a schematic structural view of the frame of the hydraulic workover rig of the present invention.
Fig. 6 is a schematic structural view of a protective cover of the hydraulic workover rig of the present invention.
1-workover hoist module, 2-swabbing module, 3-hydraulic winch module, 4-power module, 5-control module, 6-support leg module, 7-unit structure module, 11-outer carriage, 12-inner carriage, 13-hydraulic cylinder, 14-sliding trolley, 15-pulley block, 16-steel wire rope, 17-fixing frame, 18-oil rod component fixing head, 71-vehicle frame and 72-shield.
Detailed Description
The present invention will be described in detail with reference to the following embodiments and the accompanying drawings, wherein the described embodiments are only intended to facilitate the understanding of the present invention, and do not limit the present invention in any way.
As shown in fig. 1-6, the utility model provides a pair of hydraulic workover rig, including workover hoist module 1, swabbing module 2, hydraulic winch module 3 for workover hoist module 1, swabbing module 2 and hydraulic winch module 3 provide the power module 4 of power, be used for controlling workover hoist module 1, swabbing module 2, hydraulic winch module 3 and the control module 5 of power module 4 action, and be used for supporting workover hoist module 1, swabbing module 2, hydraulic winch module 3, power module 4 and control module 5's landing leg module 6 and unit structure module 7.
The utility model provides a pair of hydraulic pressure workover rig, the motion of putting through hydraulic cylinder is carried from top to bottom realizes workover and two mode of operation of swabbing, replaces traditional workover rig's cylinder, derrick and cylinder braking system to adopt electricity, hydraulic drive and control, this kind of transmission has complied with the trend that current mainstream equipment technical development with controlling the mode, accords with the environmental protection requirement that is stricter day by day. The workover rig in the utility model realizes the movement by the pushing of the oil cylinder in the lifting and lowering processes, so the workover rig has no risk of jacking the crown block; the transmission efficiency is high, fuel oil is saved, steel wire ropes are consumed very little, no guy ropes exist, the frame is convenient to take up and transport, the moving cost is low, the system structure is simple, and the replacement cost and the maintenance cost are low; the operation preparation time is greatly shortened, and the lifting speed is high; the efficiency is high, the discharge is less, the mechanical transmission parts are less, and the problems of leakage and leakage are basically eliminated; the workover rig of the utility model realizes stepless speed change, the workover operation is realized through a handle, and the swabbing operation is automatic; the workover rig of the utility model works in a low-pressure state at ordinary times, and is switched to a high-pressure state to be unlocked when the workover rig encounters jamming; the utility model provides a workover rig structure retrencies, modularization, the fault rate is low, and it is convenient to maintain, has automatic continuous swabbing function. And, the utility model provides a workover rig need not to change equipment and can carry out automatic continuous area pressure pumping operation after putting the sucker rod down to can control sucker rod upstroke and downstroke and speed accurately, when reaching the pumping environmental protection requirement, the actual oil production operation has accurately been simulated, has greatly saved manpower, material resources, financial resources and time.
The working process of the workover mode of operation: the working mode is set to the workover working mode through the control console, then the up-and-down movement of the lifting oil cylinder is realized by controlling the operating handle, the gear shifting problem and the load problem do not need to be considered in the whole workover process, the lifting system can automatically lift the load according to the load, only one operating handle related to the workover work is arranged on the control console, the upward pushing is oil cylinder lifting, corresponding oil pipe lifting action, the downward pulling is oil cylinder lowering, corresponding oil pipe lowering action, the speed of the oil cylinder movement can be controlled by an operator by controlling the opening size of the operating handle, and the operation is very simple.
The process of the automatic pumping mode of operation: the automatic pumping operation is automatically completed by the system, an operator is not required to operate, the operator only needs to set the working mode of the console to the automatic pumping working mode at first, and then presses the start button, so that the equipment can automatically realize the up-and-down movement of the lifting oil cylinder.
Preferably, the power module 4 includes a power source, a transfer case, an oil pump and a radiator, the power source transfers kinetic energy to the oil pump through the transfer case, and the oil pump outputs hydraulic energy and flow to the control module and the swabbing module. In order to balance the heat energy generated by the power module during operation, a radiator is disposed in the power module in this embodiment to control the operating temperature of the power module within a reasonable range, so as to ensure good operation of the entire power module.
Preferably, the control module 5 comprises a valve group, sensors, meters, piping and an electrical control module; the electric control module is used for distributing hydraulic energy and flow output by the power module through a preset working logic relation and is also used for controlling the sensor to realize the action of the pumping module. In this embodiment, the electric control module is preset with a working logic relationship to realize reasonable distribution of pressure and flow of the power module, and meanwhile, the electric control module can realize reasonable control of the manual pumping mode through the control handle and realize reasonable control in the automatic pumping mode through the control sensor.
As shown in fig. 2-4, the pumping module includes an outer carriage 11, an inner carriage 12, a hydraulic cylinder 13 driving the inner carriage 11 to slide along the outer carriage 12, and a sliding trolley 14 capable of sliding on the inner carriage 12, a pulley block 15 is disposed at the top of the inner carriage 12, a steel wire rope 16 is disposed on the pulley block 15, a fixing frame 17 is disposed on the outer carriage 11, one end of the steel wire rope 16 is fixed on the fixing frame 17, the other end of the steel wire rope 16 is fixed on the sliding trolley 14, and an oil rod assembly fixing head 18 is disposed on the sliding trolley.
The utility model discloses a swabbing working process does:
when hydraulic oil in the oil cylinder drives the hydraulic oil cylinder 13 to move up and down, the hydraulic oil cylinder 13 drives the inner sliding frame 12 to move up and down, the inner sliding frame 12 moves up and down to drive the sliding trolley 14 arranged on the inner sliding frame 12 to move up and down, the sliding trolley 14 moves up and down to drive the oil rod component fixing head 18, and the oil rod component fixing head 18 moves up and down to drive the oil pipe, the drill rod, the oil pumping rod and other structures fixed on the oil rod component fixing head 18 to move up and down, so that pumping work is completed.
It should be noted that, in the present invention, the pumping module 2 and the workover hoist module 1 share one set of mechanical structure.
As shown in fig. 1, the pumping module 2 further includes a limit switch for controlling the upward and downward movements of the hydraulic oil cylinder 13; when the inner sliding frame 12 moves upwards to a lower set point of the limit switch, the limit switch automatically sends an instruction to the control module 5, and the control module 5 switches oil working modes of an oil inlet and an oil return port of the hydraulic oil cylinder 13 mutually, namely the oil inlet changes into return oil and the oil return port changes into oil, so that the oil cylinder moves downwards; when the inner sliding frame 12 moves downwards to the upper set point of the limit switch, the limit switch automatically sends an instruction to the control module 5, and the control module 5 switches the working modes of oil in the oil inlet and the oil return opening of the hydraulic oil cylinder mutually, namely the oil inlet is changed into oil, the oil return opening is changed into oil, so that the oil cylinder moves upwards, and the operation is repeated in a circulating mode to realize the automatic swabbing function.
Preferably, the hydraulic winch module comprises a hydraulic winch, a steel wire rope, an arm support, a pulley block and a hook; the hydraulic winch is driven to rotate by hydraulic oil in the oil cylinder and drives the steel wire rope, the pulley block and the lifting hook to move mutually so as to realize the up-and-down movement of the hung object.
As shown in fig. 1, the leg module 6 includes an oil cylinder, and inner and outer telescopic legs; and hydraulic oil in the oil cylinder drives the inner telescopic supporting leg and the outer telescopic supporting leg to move so as to adjust the working width and the working height of the workover rig. In the embodiment, the hydraulic oil drives the inner telescopic supporting leg and the outer telescopic supporting leg to move, so that the horizontal extension and the lifting movement required by various occasions are realized, and the equipment can be reasonably controlled to be in the optimal working width and the reasonable working height.
As shown in fig. 1, 5-6, the modular structural module 7 includes a frame 71, which serves as a bridge between all modules on the workover rig, hydraulic tanks, fuel tanks, battery packs, and a shroud 72.
It should be noted that the power source in the present invention may be an electric motor, a diesel engine, or a combination of an electric motor and a diesel engine.
It should be finally noted that the above embodiments are only intended to illustrate the technical solutions of the present invention, and not to limit the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention.
Claims (9)
1. The hydraulic workover rig is characterized by comprising a workover hoisting module, a pumping module, a hydraulic winch module, a power module for providing power for the workover hoisting module, the pumping module and the hydraulic winch module, a control module for controlling the workover hoisting module, the pumping module, the hydraulic winch module and the power module to act, and a support leg module for supporting the workover hoisting module, the pumping module, the hydraulic winch module, the power module and the control module.
2. A hydraulic workover rig according to claim 1, wherein: the power module comprises a power source, a transfer case, an oil pump and a radiator, the power source transmits kinetic energy to the oil pump through the transfer case, and the oil pump outputs hydraulic energy and flow to the control module and the swabbing module.
3. A hydraulic workover rig according to claim 1, wherein: the control module comprises a valve bank, a sensor, an instrument, a pipeline and an electric control module; the electric control module is used for distributing hydraulic energy and flow output by the power module through a preset working logic relation and is also used for controlling the sensor to realize the action of the pumping module.
4. A hydraulic workover rig according to any one of claims 1 to 3, wherein: the workover hoist module comprises an outer sliding frame and an inner sliding frame, the inner sliding frame is driven to slide along a hydraulic oil cylinder of the outer sliding frame and a sliding trolley capable of sliding on the inner sliding frame, the top of the inner sliding frame is provided with a pulley block, a steel wire rope is arranged on the pulley block, a fixing frame is arranged on the outer sliding frame, one end of the steel wire rope is fixed on the fixing frame, the other end of the steel wire rope is fixed on the sliding trolley, and an oil rod component fixing head is arranged on the sliding trolley.
5. A hydraulic workover rig according to claim 4, wherein: the pumping module and the workover hoisting module share one set of mechanical structure.
6. A hydraulic workover rig according to claim 5, wherein: the pumping module also comprises a limit switch for controlling the lifting and lowering actions of the hydraulic oil cylinder; when the inner sliding frame moves upwards to a lower set point of the limit switch, the limit switch automatically sends an instruction to the control module, and the control module switches oil working modes of an oil inlet and an oil return port of the hydraulic oil cylinder mutually, namely the oil inlet changes into oil and the oil return port changes into oil, so that the oil cylinder moves downwards; when the inner sliding frame moves downwards to the upper set point of the limit switch, the limit switch automatically sends an instruction to the control module, and the control module switches the working modes of oil in the oil inlet and the oil return port of the hydraulic oil cylinder mutually, namely the oil inlet is changed into oil, the oil return port is changed into oil return, so that the oil cylinder moves upwards, and the operation is repeated in a circulating mode to realize the automatic swabbing function.
7. A hydraulic workover rig according to any one of claims 1 to 3, wherein: the supporting leg module comprises an oil cylinder and inner and outer telescopic supporting legs; and hydraulic oil in the oil cylinder drives the inner telescopic supporting leg and the outer telescopic supporting leg to move so as to adjust the working width and the working height of the workover rig.
8. A hydraulic workover rig according to any one of claims 1 to 3, wherein: the multifunctional vehicle-mounted pumping unit further comprises a unit structure module, wherein the unit structure module comprises a vehicle frame, a hydraulic oil tank, a fuel tank and a battery pack, a protective cover is arranged around the vehicle frame, and the pumping module, the power module, the control module and the supporting leg module are all arranged on the vehicle frame.
9. A hydraulic workover rig according to claim 2, wherein: the power source is an electric motor and/or a diesel engine.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201921340251.9U CN210768647U (en) | 2019-08-19 | 2019-08-19 | Hydraulic workover rig |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201921340251.9U CN210768647U (en) | 2019-08-19 | 2019-08-19 | Hydraulic workover rig |
Publications (1)
Publication Number | Publication Date |
---|---|
CN210768647U true CN210768647U (en) | 2020-06-16 |
Family
ID=71065472
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201921340251.9U Active CN210768647U (en) | 2019-08-19 | 2019-08-19 | Hydraulic workover rig |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN210768647U (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110566139A (en) * | 2019-08-19 | 2019-12-13 | 青岛北海俊惠电子仪表有限公司 | Hydraulic workover rig |
-
2019
- 2019-08-19 CN CN201921340251.9U patent/CN210768647U/en active Active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110566139A (en) * | 2019-08-19 | 2019-12-13 | 青岛北海俊惠电子仪表有限公司 | Hydraulic workover rig |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN101538998B (en) | Improved automatic control hydraulic transmission oil pumping machine | |
CN104591052A (en) | Oil-electricity hybrid power walking type aloft working platform | |
CN103821464B (en) | Tubing string vertical vehicular full-automatic smart hydraulic workover rig | |
WO2012103743A1 (en) | Assembling system of suspension arm and assembling method thereof | |
CN209040747U (en) | A kind of double power vehicle-mounted drilling and repairing machine | |
CN205577896U (en) | Novel high -efficient mechatronic workover machine | |
CN201874918U (en) | Composite hydraulic cylinder and electro-hydraulic proportional lifting system thereof | |
CN210768647U (en) | Hydraulic workover rig | |
CN210768719U (en) | Hydraulic suction machine | |
CN202139584U (en) | Walking type dynamic compaction machine | |
CN202881952U (en) | Automatic walking type drawbench | |
CN203173620U (en) | Dual-drive hydraulic power pack used for hydraulic elevator | |
CN103148060B (en) | Ascending and descending control system and method for boarding ladder | |
CN102140896A (en) | Multi-hydraulic cylinder electric energy-accumulation well repairing machine with energy accumulator | |
CN201963219U (en) | Multi-hydraulic cylinder electric energy-accumulating workover rig with energy accumulator | |
CN208564453U (en) | Vehicular motor-pumped well shelf assembly | |
CN110566139A (en) | Hydraulic workover rig | |
CN101629477A (en) | Energy-saving and emission-reducing petroleum well servicing rig | |
CN202441281U (en) | Energy-saving hydraulic mechanism for workover rigs | |
CN2723413Y (en) | Novel multifunction pipe hoist | |
CN203541966U (en) | Tower crane pull rod auxiliary mounting system | |
CN205773170U (en) | Underground mine use Mobile lifting inspection platform | |
CN205437117U (en) | Multi -functional high temperature of double claw drags for steel machine | |
CN201635664U (en) | Hoisting device hoisted by two cylinders | |
CN101829627B (en) | Integrated hydraulic driven dual-shaft moving mill feed trolley |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
GR01 | Patent grant | ||
GR01 | Patent grant |