CN108502763A - A kind of the AC frequency conversion hoister system and its control method of removal hydraulic disc brake - Google Patents
A kind of the AC frequency conversion hoister system and its control method of removal hydraulic disc brake Download PDFInfo
- Publication number
- CN108502763A CN108502763A CN201810278550.8A CN201810278550A CN108502763A CN 108502763 A CN108502763 A CN 108502763A CN 201810278550 A CN201810278550 A CN 201810278550A CN 108502763 A CN108502763 A CN 108502763A
- Authority
- CN
- China
- Prior art keywords
- braking
- winch
- pusher
- brake
- hydraulic disc
- 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.)
- Pending
Links
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000009467 reduction Effects 0.000 claims description 23
- 230000009471 action Effects 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000005553 drilling Methods 0.000 description 6
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 210000000080 chela (arthropods) Anatomy 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
- B66D1/60—Rope, cable, or chain winding mechanisms; Capstans adapted for special purposes
- B66D1/74—Capstans
- B66D1/7442—Capstans having a horizontal rotation axis
- B66D1/7447—Capstans having a horizontal rotation axis driven by motor only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
- B66D1/28—Other constructional details
- B66D1/40—Control devices
- B66D1/48—Control devices automatic
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
Abstract
The invention discloses a kind of the AC frequency conversion hoister systems and its control method of removal hydraulic disc brake, the system substitutes hydraulic disc brake using pusher-tray type brake system, the working clamp of hydraulic disc brake and the function of safety tongs are realized in the normally opened part and normally closed part of pusher-tray type brake system respectively, it cooperates and completes the brake function of the hydraulic disc brakes such as service braking, parking braking, emergency braking, anti-collision braking, realize that AC frequency conversion winch is not reconfigured the target of hydraulic disc brake, both winch weight had been alleviated, it is easy to operate, use and maintenance is convenient, and reduces production cost.
Description
Technical field
The invention belongs to petroleum drilling and mining equipment technology fields, and in particular to a kind of AC frequency conversion winch of removal hydraulic disc brake
System and its control method.
Background technology
Classify according to drive form, winch has mechanically powered winch, electrical drawworks and hydraulically-powered winch.It is conventional
Winch will configure a set of main brake and add a set of auxiliary brake, i.e., the configuration of two sets brakes.
Main brake refer to can directly active control and brake winch brake.Hydraulic disc brake is big with its braking capacity,
Reliability and it is safe, brake sensitivity is high, remote-controlled, labor intensity is low, brake thermal diffusivity is good and thermal stability forms well
For the standing main brake of various drilling machines.Hydraulic disc brake has service braking, emergency braking, parking braking, anti-collision four kinds of work(of braking
Energy.
In recent years, domestic AC frequency variated rig development quickly, has winch, turntable variable speed, AC frequency conversion system
Digitlization accurately controls, the advantages that automating, is intelligent of drilling machine easy to implement.But pass through the study found that becoming for exchange
For all electric system configuration of frequency drilling machine, winch is equipped with hydraulic disc brake and also needs to increase additional hydraulic pressure new system:Hydraulic station,
Hydraulic valve bank etc. both occupies floor space, increases weight, and bring additional cost payout, and influence AC frequency variated rig
All electric system in terms of integration utilize.
Invention content
The object of the present invention is to provide a kind of the AC frequency conversion hoister systems and its control method of removal hydraulic disc brake, from strand
The comprehensive mesh for realizing AC frequency conversion winch removal hydraulic disc brake of bassinet structure, pusher-tray type brake system and control method etc.
Mark.
The technical solution adopted in the present invention is a kind of AC frequency conversion hoister system of removal hydraulic disc brake, including winch
Structure division and winch control section, winch structure part includes pusher-tray type brake system, roller axle assembly, reduction box, automatic
Drill feeding facility and alternating-current variable frequency motor;Pusher-tray type brake system is connect with roller axle assembly, and automatic driller passes through clutch
It is connect with reduction box, reduction box is logical to be connect with roller axle assembly, and alternating-current variable frequency motor is connect with reduction box;
Winch control section includes PLC control system, frequency converter, driller control house, roller encoder;PLC control system
It is connect respectively with frequency converter, driller control house by industrial bus;Driller control house passes through industrial-controlled general line and the push-plate
Formula brake system connects;Frequency converter is connect by cable with the alternating-current variable frequency motor;Roller encoder passes through terminal pad and institute
State the connection of roller axle assembly.
Further, the reduction box is two grades of reduction boxes.
Further, the alternating-current variable frequency motor includes two, is connect with the reduction box.
Another technical solution of the present invention is, using the control of the AC frequency conversion hoister system of above-mentioned removal hydraulic disc brake
Method includes the following steps when carrying out lifting of winch or decentralization action:
1. applying enough air pressures to the normally closed part of pusher-tray type brake system, spring braking power is gradually overcome, it is normal until opening
Closing part point;
2. continuously decrease the atmospheric pressure value of normally opened partial piston chamber, reduction brake force slowly, until load begin to ramp up or
Decline, into above carry or decentralization action;
3. normally above carry or decentralization process in, the size of normally opened partial piston chamber atmospheric pressure value is controlled, to adjust push-plate
Formula brake braking torque, control load above carry or lowering velocity;
When carrying out service braking:The size for controlling the atmospheric pressure value of normally opened partial piston chamber, makes the system of pusher-tray type brake system
Dynamic torque be more than loading moment, make load above carry or lowering velocity is zero, realize the service braking function of main brake;
When carrying out parking braking:Air pressure directly completely in the cylinder of the normally closed part of release pusher-tray type brake system, then
Spring braking power acts, and so that normally closed part is entered on-position, realizes the parking braking function of main brake;
When carrying out emergency braking:The plunger shaft of normally opened part is pressurized to maximum value, and the cylinder of normally closed part is died, spring system
It is dynamic, then common braking of the normally closed part with normally opened part is completed, maximum braking moment is provided, realizes the emergency braking of hydraulic disc brake
Function;
When carrying out anti-collision braking:Winch crosses circle anticollision system and links with pusher-tray type brake system, realizes when winch above carries
Anti-collision is braked.
The principle of the present invention is, most heavy to realize the functions such as service braking, emergency braking, parking braking, anti-collision braking
Want be can directly active control and braking winch.The present invention is braked with pusher-tray type and substitutes hydraulic disc brake, then pusher-tray type
Brake must have the brake function required by main brake.Therefore the alternating-current variable frequency motor of the present invention drives two grades of reduction boxes, with
Pusher-tray type brake system is main brake, is stopped supplemented by alternating-current variable frequency motor dynamic braking, cooperates the raising for completing winch under
It puts, removal hydraulic disc brake configuration.Pusher-tray type brake system realizes winch operating mode with alternating-current variable frequency motor dynamic braking collective effect;
Brake torque control model controls for PLC program, by monitoring the parameter of roller encoder in real time, by control system according to power
Model carries out raising or decentralization, realizes whole closed-loop control of AC frequency conversion winch during making a trip.The present invention controls system
System uses pusher-tray type brake system for main brake, the brake modes stopped supplemented by alternating-current variable frequency motor dynamic braking.NEW TYPE OF COMPOSITE is certainly
It is dynamic to send brill and driller control cab technology (ADS):It is organically combined with winch main motor dynamic braking using pusher-tray type brake, collection
PLC intelligent controls, drilling parameter monitoring are integrated with display, and automatic bit feed function is realized with complex method.
The beneficial effects of the invention are as follows:
1) using hydraulic disc brake is substituted as main brake, influence of the hydraulic system to AC frequency conversion system is eliminated,
Winch redundancy structure is simplified, the working efficiency of winch is further improved.
2) mechanisms such as hydraulic station, braking clamp, brake disc, the control valve that hydraulic disc type brake device is included are eliminated, both
Winch weight is alleviated, and reduces production cost.
3) for pusher-tray type brake system compared with hydraulic disc brake, having allows dynamic friction, lasting to skid, can be arbitrary
Peak torque is realized under torque, controls flexible advantage.
4) pusher-tray type brake system uses gas control mode, easy to operate, and use and maintenance is convenient, and air source is at low cost.
5) pusher-tray type brake system can both be connect by shaft coupling with roller axle assembly, can also between be mounted on roller
On axle assembly, mounting means is versatile and flexible, applied widely, can be used for the AC frequency conversion winch of all kinds.
Description of the drawings
Fig. 1 is the fundamental diagram of the present invention;
Fig. 2 is the structural schematic diagram of the present invention;
Fig. 3 is the control flow chart of the present invention;
Fig. 4 is the pusher-tray type brake structure schematic diagram that the present invention applies.
In figure, 1. alternating-current variable frequency motors, 2. two grades of reduction boxes, 3. pusher-tray type brake system, 4. roller axle assemblies, 5. rollers
Encoder, 6. push-plate clutches, 7. automatic drillers, 8. frequency converters, 9.PLC control systems, 10. driller control houses, 11. often
Open part, 12. normally closed parts.
Specific implementation mode
Present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments, but the present invention is not limited to
These embodiments.
Referring to Fig.1, the structure of Fig. 2, Fig. 3, AC frequency conversion hoister system of the present invention are, including winch structure part and winch
Control section, winch structure part include pusher-tray type brake system 3, roller axle assembly 4, two grades of reduction boxes 2, automatic drillers
7 etc.;Pusher-tray type brake system 3 is connect by shaft coupling with roller axle assembly 4;Automatic driller 7 by push-plate clutch 6 with
Two connect when reduction box 2, and two grades of reduction boxes 2 are connect by shaft coupling with roller axle assembly 4;Alternating-current variable frequency motor 1 passes through shaft coupling
Device is connect with two grades of reduction boxes 2, and there are two alternating-current variable frequency motors.
Winch control section includes PLC control system 9, frequency converter 8, driller control house 10, roller encoder 5 etc..PLC is controlled
System 9 processed is connect with frequency converter 8, driller control house 10 respectively by industrial bus;Driller control house 10 is total by Industry Control
Line is connect with pusher-tray type brake system 3;Frequency converter 8 is connect by cable with alternating-current variable frequency motor 1;Roller encoder 5 passes through company
Disk is connect to connect with roller axle assembly 4.
Pusher-tray type brake system 3 is tray type structure, as shown in figure 4, being made of normally opened and normally closed two parts:(1) normally opened portion
11 are divided to implement braking for plunger shaft pressurization, the structure of pressure release spring reset release is identical as hydraulic disc brake working clamp working method;
(2) normally closed part 12 is spring braking, and the structure that cylinder pressurization is unclamped is identical as the safety tongs working method of hydraulic disc brake.
In conclusion the normally opened part and normally closed part of pusher-tray type brake system 3 can realize the work of hydraulic disc brake respectively
The function of pincers and safety tongs, mutual cooperation can be finally completed the hydraulic pressure such as service braking, parking braking, emergency braking, anti-collision braking
Therefore the brake function of disc brake can substitute hydraulic disc brake using pusher-tray type brake system 3, complete the institute of winch main brake
It is functional, to realize that AC frequency conversion winch is not reconfigured the target of hydraulic disc brake.
Use the AC frequency conversion hoister system control lifting of winch or decentralization action method for:
1) warming-up exercise
Start drilling machine by driller control house 10, judges that the original states such as PLC control system 9, pusher-tray type brake system 3 are
It is no normal:The normally opened partial piston chamber air pressure of pusher-tray type brake system 3 is maximum value, belongs to maximum on-position;Normally closed part
It does not ventilate, belongs to spring braking state.Inspection can normally carry out lifting of winch or decentralization action.
2) lifting of winch or decentralization action:
1. applying enough air pressures to 3 normally closed part of pusher-tray type brake system, overcomes spring braking power, opens normally closed part,
Then normally closed partial brake power releases;
2. continuously decreasing the atmospheric pressure value of normally opened partial piston chamber, reduction brake force that can be slowly, until load force is more than system
Power, then load begin to ramp up or decline, into above carry or decentralization action;
3. normally above carry or decentralization process in, control the size of normally opened partial piston chamber atmospheric pressure value, be adjusted push-plate
Formula brake braking torque, to controllable load above carry or lowering velocity.Wherein, the numerical value of braking torque is with plunger shaft gas
The variation of pressure value and change.
Use the AC frequency conversion hoister system control winch brake method for:
1. service braking:The size for controlling the atmospheric pressure value of normally opened partial piston chamber makes the braking of pusher-tray type brake system 3 turn round
Square be more than loading moment, can make load above carry or lowering velocity is zero, you can realize the service braking function of main brake.
2. parking braking:Air pressure directly completely in the cylinder of the normally closed part of release pusher-tray type brake system 3, then brake
Spring works make normally closed part enter on-position, you can realize the parking braking function of main brake.
3. emergency braking:The plunger shaft of normally opened part is pressurized to maximum value, and the cylinder of normally closed part is died into spring system
Dynamic state, can complete common braking of the normally closed part with normally opened part, provide maximum braking moment, you can realize hydraulic disc brake
Emergency braking function.
4. anti-collision is braked:Winch crosses circle anticollision system and links with pusher-tray type brake system 3, you can realizes when winch above carries
Anti-collision is braked.
Claims (4)
1. a kind of AC frequency conversion hoister system of removal hydraulic disc brake, which is characterized in that including winch structure part and winch control
Part processed, the winch structure part include pusher-tray type brake system, roller axle assembly, reduction box, automatic driller and friendship
Flow variable-frequency motor;Pusher-tray type brake system is connect with roller axle assembly, and automatic driller is connect by clutch with reduction box,
Reduction box is logical to be connect with roller axle assembly, and alternating-current variable frequency motor is connect with reduction box;
The winch control section includes PLC control system, frequency converter, driller control house, roller encoder;PLC control system
It is connect respectively with frequency converter, driller control house by industrial bus;Driller control house passes through industrial-controlled general line and the push-plate
Formula brake system connects;Frequency converter is connect by cable with the alternating-current variable frequency motor;Roller encoder passes through terminal pad and institute
State the connection of roller axle assembly.
2. the AC frequency conversion hoister system of removal hydraulic disc brake according to claim 1, which is characterized in that the reduction box
For two grades of reduction boxes.
3. the AC frequency conversion hoister system of removal hydraulic disc brake according to claim 1, which is characterized in that the exchange becomes
Frequency motor includes two, is connect with the reduction box.
4. a kind of control method of AC frequency conversion hoister system using removal hydraulic disc brake as described in claim 1, special
Sign is, when carrying out lifting of winch or decentralization action, includes the following steps:
1. applying enough air pressures to the normally closed part of pusher-tray type brake system, overcomes spring braking power, open normally closed part;
2. continuously decreasing the atmospheric pressure value of normally opened partial piston chamber, reduction brake force slowly begins to ramp up or declines until loading,
Into above carry or decentralization action;
3. normally above carry or decentralization process in, control the size of normally opened partial piston chamber atmospheric pressure value, with adjust pusher-tray type brake
The braking torque of vehicle, control load above carry or lowering velocity;
When carrying out service braking:The size for controlling the atmospheric pressure value of normally opened partial piston chamber makes the braking of pusher-tray type brake system turn round
Square be more than loading moment, make load above carry or lowering velocity is zero, realize the service braking function of main brake;
When carrying out parking braking:Air pressure directly completely in the cylinder of the normally closed part of release pusher-tray type brake system, makes normally closed
Part enters on-position, realizes the parking braking function of main brake;
When carrying out emergency braking:The plunger shaft of normally opened part is pressurizeed, and the cylinder of normally closed part is died, complete normally closed part with it is normally opened
Partial common braking, provides maximum braking moment, realizes the emergency braking function of hydraulic disc brake;
When carrying out anti-collision braking:Winch crosses circle anticollision system and links with pusher-tray type brake system, realizes anti-collision when winch is above put forward
Braking.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201810278550.8A CN108502763A (en) | 2018-03-30 | 2018-03-30 | A kind of the AC frequency conversion hoister system and its control method of removal hydraulic disc brake |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201810278550.8A CN108502763A (en) | 2018-03-30 | 2018-03-30 | A kind of the AC frequency conversion hoister system and its control method of removal hydraulic disc brake |
Publications (1)
Publication Number | Publication Date |
---|---|
CN108502763A true CN108502763A (en) | 2018-09-07 |
Family
ID=63379460
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201810278550.8A Pending CN108502763A (en) | 2018-03-30 | 2018-03-30 | A kind of the AC frequency conversion hoister system and its control method of removal hydraulic disc brake |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN108502763A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108622814A (en) * | 2018-05-15 | 2018-10-09 | 宝鸡石油机械有限责任公司 | The integrated hoister system of the major-minor brake of one kind and its control method |
CN110127546A (en) * | 2018-12-07 | 2019-08-16 | 中国煤炭科工集团太原研究院有限公司 | A self-supporting variable frequency traction winch |
CN110723671A (en) * | 2019-09-20 | 2020-01-24 | 宝鸡石油机械有限责任公司 | Four-gear transmission case for petroleum drilling winch |
CN111170190A (en) * | 2020-04-11 | 2020-05-19 | 山东科瑞机械制造有限公司 | Drilling rig winch disc brake integrated control method and device |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN2493746Y (en) * | 2001-07-26 | 2002-05-29 | 杨恩峰 | Pneumatic brake controller for petroleum drill |
CN2565794Y (en) * | 2002-08-13 | 2003-08-13 | 杨恩峰 | Petroleum well drilling winch pneumatic controlled brake actuator |
CN101978190A (en) * | 2008-03-19 | 2011-02-16 | 乌戈·雅各布·雷 | Air-cooled pneumatically actuated brake with multiple discs of reduced diameter especially suitable for industrial applications |
CN201763856U (en) * | 2010-08-27 | 2011-03-16 | 焦作制动器股份有限公司 | Pneumatic disk brake |
CN203612858U (en) * | 2013-10-25 | 2014-05-28 | 程波 | High-efficiency intelligent safe petroleum drilling winch system |
CN205527464U (en) * | 2016-01-19 | 2016-08-31 | 宝鸡石油机械有限责任公司 | Single reducing gear box oil drilling winch that adoption gas formula of manipulating stock quotations was braked |
-
2018
- 2018-03-30 CN CN201810278550.8A patent/CN108502763A/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN2493746Y (en) * | 2001-07-26 | 2002-05-29 | 杨恩峰 | Pneumatic brake controller for petroleum drill |
CN2565794Y (en) * | 2002-08-13 | 2003-08-13 | 杨恩峰 | Petroleum well drilling winch pneumatic controlled brake actuator |
CN101978190A (en) * | 2008-03-19 | 2011-02-16 | 乌戈·雅各布·雷 | Air-cooled pneumatically actuated brake with multiple discs of reduced diameter especially suitable for industrial applications |
CN201763856U (en) * | 2010-08-27 | 2011-03-16 | 焦作制动器股份有限公司 | Pneumatic disk brake |
CN203612858U (en) * | 2013-10-25 | 2014-05-28 | 程波 | High-efficiency intelligent safe petroleum drilling winch system |
CN205527464U (en) * | 2016-01-19 | 2016-08-31 | 宝鸡石油机械有限责任公司 | Single reducing gear box oil drilling winch that adoption gas formula of manipulating stock quotations was braked |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108622814A (en) * | 2018-05-15 | 2018-10-09 | 宝鸡石油机械有限责任公司 | The integrated hoister system of the major-minor brake of one kind and its control method |
CN108622814B (en) * | 2018-05-15 | 2019-08-20 | 宝鸡石油机械有限责任公司 | The integrated hoister system of the major-minor brake of one kind and its control method |
CN110127546A (en) * | 2018-12-07 | 2019-08-16 | 中国煤炭科工集团太原研究院有限公司 | A self-supporting variable frequency traction winch |
CN110723671A (en) * | 2019-09-20 | 2020-01-24 | 宝鸡石油机械有限责任公司 | Four-gear transmission case for petroleum drilling winch |
CN111170190A (en) * | 2020-04-11 | 2020-05-19 | 山东科瑞机械制造有限公司 | Drilling rig winch disc brake integrated control method and device |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN108502763A (en) | A kind of the AC frequency conversion hoister system and its control method of removal hydraulic disc brake | |
CN108622814B (en) | The integrated hoister system of the major-minor brake of one kind and its control method | |
CN110950222B (en) | Super-deep well super-tonnage cage lifting system driven by assistance of vertical linear motor | |
CN205527464U (en) | Single reducing gear box oil drilling winch that adoption gas formula of manipulating stock quotations was braked | |
CN107806484A (en) | Brakes, control method and gate open and close device for permanent magnet direct-drive mechanism | |
CN202022696U (en) | Double-set value constant-moment secondary braking control system of mine hoist | |
CN207108329U (en) | Rail-mounted gantry container crane lifting mechanism with emergency driving device | |
CN110203840B (en) | Drilling machine winch brake device with disc brake and motor hovering integrated and control method thereof | |
CN108639985B (en) | Efficient composite brake mode alternating-current variable-frequency winch and lowering control method thereof | |
CN108859779B (en) | Electro-hydraulic coupling braking system of alternating-current variable-frequency electric-driven transport vehicle and control method | |
CN1325752C (en) | Draw works | |
CN105302052B (en) | A kind of mining elevator electric control gear system and control method | |
CN110775853B (en) | Dynamic compactor safety braking system | |
CN104865083A (en) | Multi-rope friction hoist load simulation hydraulic loading device | |
CN205367553U (en) | Unipolar list reducing gear box exchanges frequency conversion electrical winch for oil -well rig | |
CN101382068A (en) | Eton brake auto bit feed system | |
CN203412527U (en) | Self-propelled small-tonnage guy-rope-free hydraulic disc-brake workover rig | |
CN212532120U (en) | Automatic gear shifting winch | |
CN207361670U (en) | A kind of mine hoist torque-controllable sure brake system | |
CN205575445U (en) | Pneumatic disk brake control system of special water -cooling based on high -efficient frequency conversion winch | |
CN206014304U (en) | The disc brake automatic control system of flexible brake | |
CN2670593Y (en) | Power Recovery Braking System for Oil Drilling Rigs | |
CN108316867A (en) | A kind of pure electric vehicle workover rig | |
CN219546581U (en) | Gas-liquid disc brake device for workover rig | |
CN206035454U (en) | Electricity drives oil recovery car |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PB01 | Publication | ||
PB01 | Publication | ||
SE01 | Entry into force of request for substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180907 |
|
RJ01 | Rejection of invention patent application after publication |