CN205184783U - High -tension transmission patrols line and work robot arm based on steering engine driving - Google Patents
High -tension transmission patrols line and work robot arm based on steering engine driving Download PDFInfo
- Publication number
- CN205184783U CN205184783U CN201520948707.5U CN201520948707U CN205184783U CN 205184783 U CN205184783 U CN 205184783U CN 201520948707 U CN201520948707 U CN 201520948707U CN 205184783 U CN205184783 U CN 205184783U
- Authority
- CN
- China
- Prior art keywords
- palm
- forearm
- wrist
- arm
- relative
- 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.)
- Expired - Fee Related
Links
Landscapes
- Manipulator (AREA)
Abstract
High -tension transmission patrols line and work robot arm based on steering engine driving belongs to special robots technical field, and aim at solves that the focus that prior art exists is unstable, stability is low, the structure is complicated and control trouble problem. The utility model discloses a high -tension transmission patrols line and work robot arm based on steering engine driving's big arm is shell structure, the forearm is two plate structures, big arm one end is connected with the shoulder through accurate rotatory shafting actuating mechanism, the one end of other end inscription forearm forms the elbow, the other end of forearm is external in the wrist, be connected through pivot A for one section of the other end of wrist and palm, the both sides at the palm other end are installed to two fingers, two relative finger inboards are connected through pivot B and a walking wheel respectively, be luffing through a set of drive arrangement of giving a present drive forearm arm big relatively respectively, luffing is to the relative forearm of wrist, and rotary motion is for the wrist to the palm, and open and close movement is for the palm to two fingers, and the relative finger of walking wheel rotates.
Description
Technical field
The utility model belongs to specialized robot technical field, is specifically related to a kind of high voltage power transmission line walking based on servo driving and work machine human arm.
Background technology
High pressure and EHV transmission are the major ways of remote dispensing electricity now.High-voltage line, transmission tower and other power transmission facilities are chronically exposed to the situations such as the impact that field continues to be subject to the severe natural conditions such as wind, rain, snow and other force majeure is often ruptured, wearing and tearing, cause unnecessary loss to industrial production and daily life.In order to prevent the generation of above-mentioned situation, need to carry out regular visit to high-voltage line.Traditional artificial line walking inefficiency, dangerous high, accuracy rate is on the low side, and helicopter line walking then cost is high, large to the dependence of weather.
After the eighties in 20th century, the entity and individual such as the people such as Japanese scholars sawada, HideoNakamura, TRC company of the U.S., Canadian SergeMontambault have successively carried out and have patrolled and examined and the development work of Work robot.After the nineties, domestic Wuhan University, Shandong University, Shenyang automation research institute of the Chinese Academy of Sciences, automation research Suo Deng unit of the Chinese Academy of Sciences have also in succession carried out and have patrolled and examined and the experimental study of Work robot.At present, mounted model patrol and examine and Work robot mainly contains two-arm and three-arm arrangement, although two arm configuration obstacle detourings are flexible, there is crank, the shortcomings such as low stability; Though tricycle structure has higher flexibility and stability, but complex structure, control trouble.
Utility model content
The purpose of this utility model is to propose a kind of high voltage power transmission line walking based on servo driving and work machine human arm, solves that crank that prior art exists, stability are low, complex structure and the troublesome problem of control.Can high voltage power transmission be helped more reliably to patrol and examine and Work robot completes inter-related task.
For achieving the above object, the high voltage power transmission line walking based on servo driving of the present utility model and work machine human arm comprise shoulder, large arm, ancon, forearm, wrist, palm, finger, road wheel and Power Drive Unit;
Described large arm is shell structure, and forearm is double plate structure, and large arm one end is connected by precision rotation axle system drives structure with described shoulder, and the one end being connected on forearm in the other end forms ancon, and described large arm is connected by connecting axle A with both sides, forearm contact position; Described forearm is fixedly connected with described connecting axle A by key, is provided with Power Drive Unit described in a group inside described large arm and forearm, drives the relative large arm of described forearm to do elevating movement;
Described wrist is shell structure, be connected on outside the other end of described forearm in described wrist, described forearm is connected by connecting axle B with both sides, wrist contact position, described forearm is fixedly connected with described connecting axle B by key, wrist inwall is provided with Power Drive Unit described in a group, drives the relative forearm of described wrist to do elevating movement;
Described palm is shell structure, the other end of described wrist is connected by rotating shaft A with one section of described palm, described rotating shaft A is positioned on the common centreline of palm and wrist, and described palm inside is provided with Power Drive Unit described in a group, drives described palm to rotate relative to wrist;
Described finger is framed plate structure, two described finger mounted are in the both sides of the palm other end, described finger is connected with palm by connecting plate, described connecting plate one end is connected by four-bar linkage structure with described finger, be connected by Zhou Xi mechanism between palm with four-bar linkage structure, the other end is connected with described palm by connecting axle C, described connecting plate is fixedly connected with described connecting axle C, be provided with one group of Power Drive Unit inside described palm, drive two described fingers to do open and close movement relative to palm;
Relative two described finger inner sides are connected with a road wheel respectively by rotating shaft B, and described road wheel is fixedly connected with described rotating shaft B by key, and described finger inner side is provided with one group of Power Drive Unit, drives described road wheel to rotate relative to pointing.
Described Power Drive Unit comprises steering wheel and gear drive, described gear drive comprises driving gear and driven gear, described steering wheel is fixed on steering wheel end cap, and described driving gear is fixed on described steering wheel, described driving gear and driven gear engagement.
Described forearm does elevating movement relative to large arm and is specially: described connecting axle A is fixedly connected with described driven gear by key.
Described wrist is done elevating movement relative to forearm and is specially: described connecting axle B is fixedly connected with described driven gear by key.
Described palm rotates relative to wrist and is specially: described wrist is fixedly connected with described driven gear.
Two described fingers do open and close movement relative to palm and are specially: two described connecting axle C are fixedly connected with a described driven gear respectively by key, and the output shaft of described steering wheel is parallel and coplanar with described connecting axle C.
Described road wheel is specially relative to pointing to rotate: described rotating shaft B is fixedly connected with described driven gear by key.
Described robot arm also comprises photoelectric sensor, and described photoelectric sensor is arranged on each movable joint position, each interarticular joint mechanics of Real-Time Monitoring, angle, positional information.
The beneficial effects of the utility model are: the high voltage power transmission line walking based on servo driving of the present utility model and work machine human arm are applicable to three arm suspension configuration, adopt copy man arm structure, can be applicable to super-pressure and patrol and examine and the front and back arm of Work robot.To be patrolled and examined with high pressure by shoulder and Work robot is fixedly connected with, this arm apparatus is made up of shoulder, large arm, ancon, forearm, wrist, palm, finger and road wheel.According to the action request of obstacle detouring during inspection robot operation, arm has large arm rotation, forearm pitching, palm to rotate, wrist pitching, fingers opening-closing five frees degree.
Steering wheel divides simulation steering wheel and digital rudder controller two class.The utility model selects digital rudder controller, and such is made up of brshless DC motor, back gear, motor-drive circuit, feedback circuit four part.Described digital rudder controller rotates the execution unit of five actions as forearm pitching, palm rotation, wrist pitching, fingers opening-closing, road wheel, has joint pattern and wheeled pattern two kinds of mode of operations; Joint pattern can be used for driving forearm pitching, wrist pitching, palm rotation, fingers opening-closing action, and wheeled pattern is used for the rotation of ground-engaging wheel, and the control data bag sent by slave computer of choosing of mode of operation is determined; Each steering wheel is first connected with slave computer by the series connection of RS485 bus again, and the communication of slave computer and steering wheel is realized by packet.Brshless DC motor and the deceleration device of described digital rudder controller are the integrated design, and its output shaft is connected with driving gear; Motor-drive circuit is connected with brshless DC motor thus controls its rotation and realizes position control; Feedback circuit detects the rotation of motor and feeds back to slave computer.
The slave computer of steering wheel accepts the instruction of host computer and decipher, then is sent to the group's steering wheel be cascaded by MAX485 level shifting circuit, the ID in group's steering wheel reading command, and then corresponding steering wheel performs instruction, drives arm action.Described steering wheel host computer, as built-in industrial control machine PC104, gather joint power, angle, the positional information of the feedback such as force-sensing sensor, angular displacement sensor, limit sensors be arranged between each arm joint, formation control instruction also sends to slave computer, and the communication of host computer and slave computer is realized by the form such as serial communication, bus.
It is simple that high voltage power transmission line walking based on servo driving of the present utility model and work machine human arm have structure, controls easily, and flexibility height waits remarkable advantage.Can according to the General structure scheme independent assortment of high voltage power transmission crusing robot, enough flexibilities and flexibility freely can cross over the various obstacles on power transmission line, replace the line walking work manually completing transmission line of electricity; As the work jibs of relevant power line Work robot, what enough frees degree and flexibility can be reliable and stable completes work high above the ground task, and in addition, the utility model also can be used for the mechanical arm of other job that requires special skills robots.
Accompanying drawing explanation
Fig. 1 is the high voltage power transmission line walking based on servo driving of the present utility model and work machine human arm overall structure schematic diagram;
Fig. 2 is elbow structure schematic diagram in the high voltage power transmission line walking based on servo driving of the present utility model and work machine human arm;
Fig. 3 is wrist and forearm junction structural representation in the high voltage power transmission line walking based on servo driving of the present utility model and work machine human arm;
Fig. 4 is wrist and palm junction structural representation in the high voltage power transmission line walking based on servo driving of the present utility model and work machine human arm;
Fig. 5 is palm structural representation in the high voltage power transmission line walking based on servo driving of the present utility model and work machine human arm;
Fig. 6 is roller structure schematic diagram in the high voltage power transmission line walking based on servo driving of the present utility model and work machine human arm;
Fig. 7 is the high voltage power transmission line walking based on servo driving of the present utility model and work machine human arm control system block diagram;
Wherein: 1, shoulder, 2, large arm, 3, ancon, 4, forearm, 5, wrist, 6, palm, 7, point, 8, road wheel, 9, gear drive, 10, steering wheel end cap, 11, steering wheel, 12, connecting axle A, 13, connecting axle B, 14, rotating shaft A, 15, connecting axle C, 16, rotating shaft B.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiment of the present utility model is described further.
See accompanying drawing 1, the high voltage power transmission line walking based on servo driving of the present utility model and work machine human arm comprise shoulder 1, large arm 2, ancon 3, forearm 4, wrist 5, palm 6, finger 7, road wheel 8 and Power Drive Unit;
See accompanying drawing 2, described large arm 2 is shell structure, and forearm 4 is double plate structure, and large arm 2 one end is connected with described shoulder 1 by precision rotation axle system driving mechanism, the one end being connected on forearm 4 in the other end forms ancon 3, and described large arm 2 is connected by connecting axle A12 with both sides, forearm 4 contact position; Described forearm 4 is fixedly connected with described connecting axle A12 by key, is provided with Power Drive Unit described in a group inside described large arm 2 and forearm 4, drives the relative large arm 2 of described forearm 4 to do elevating movement;
Precision rotation axle system driving mechanism comprises steering wheel mount pad, steering wheel, spring bearing, bearing block and torque-transmitter shaft; Be connected with large arm 2 rigidity outside steering wheel mount pad, be connected with the tight interference fits of the outside mounting flange of steering wheel inside steering wheel mount pad; Steering wheel endoporus axle and torque-transmitter shaft are coaxially tightly linked, and torque-transmitter shaft is arranged in bearing block by spring bearing, and bearing block and shoulder 1 upper end rigidity are connected, and by servo driving, drive large arm 2 opposite shoulder 1 to rotate;
See accompanying drawing 3, described wrist 5 is shell structure, be connected on outside the other end of described forearm 4 in described wrist 5, described forearm 4 is connected by connecting axle B13 with both sides, wrist 5 contact position, described forearm 4 is fixedly connected with described connecting axle B13 by key, wrist 5 inwall is provided with Power Drive Unit described in a group, drives the relative forearm 4 of described wrist 5 to do elevating movement;
See accompanying drawing 4, described palm 6 is shell structure, the other end of described wrist 5 is connected by rotating shaft A14 with one section of described palm 6, described rotating shaft A14 is positioned on the common centreline of palm 6 and wrist 5, described palm 6 inside is provided with Power Drive Unit described in a group, drives described palm 6 to rotate relative to wrist 5;
See accompanying drawing 5, described finger 7 is framed plate structure, two described fingers 7 are arranged on the both sides of palm 6 other end, described finger 7 is connected with palm 6 by connecting plate, described connecting plate one end is connected by four-bar linkage structure with described finger 7, palm (6) is connected by Zhou Xi mechanism with between four-bar linkage structure, the other end is connected with described palm 6 by connecting axle C15, described connecting plate is fixedly connected with described connecting axle C15, be provided with one group of Power Drive Unit inside described palm 6, drive two described fingers 7 to do open and close movement relative to palm 6;
See accompanying drawing 6, be connected with a road wheel 8 respectively by rotating shaft B16 inside two relative described fingers 7, described road wheel 8 is fixedly connected with described rotating shaft B16 by key, is provided with one group of Power Drive Unit inside described finger 7, drives described road wheel 8 to rotate relative to finger 7.
Described Power Drive Unit comprises steering wheel 11 and gear drive 9, described gear drive 9 comprises driving gear and driven gear, described steering wheel 11 is fixed on steering wheel end cap 10, and described driving gear is fixed on described steering wheel, described driving gear and driven gear engagement.
The relative large arm 2 of described forearm 4 is done elevating movement and is specially: described connecting axle A12 is fixedly connected with described driven gear by key.
The relative forearm 4 of described wrist 5 does elevating movement and is specially: described connecting axle B13 is fixedly connected with described driven gear by key.
Described palm 6 rotates relative to wrist 5 and is specially: described wrist 5 is fixedly connected with described driven gear.
Two described fingers 7 do open and close movement relative to palm 6 and are specially: two described connecting axle C15 are fixedly connected with a described driven gear respectively by key, and the output shaft of described steering wheel 11 is parallel and coplanar with described connecting axle C15.
Described road wheel 8 rotates relative to finger 7 and is specially: described rotating shaft B16 is fixedly connected with described driven gear by key.
Described robot arm also comprises photoelectric sensor; described photoelectric sensor is arranged on each movable joint position; play the effect of the joint mechanics in each joint of Measurement & Control, movement angle and distance; play the effect of each movable joint of position limitation protection simultaneously; avoid excessive, the movement angle of joint mechanics occurs and distance exceedes the situations such as allowed range of movement; photoelectric sensor mounting base is modular mechanism, can need to increase and decrease number of sensors according to line walking, and realize changing fast.The each interarticular joint mechanics of Real-Time Monitoring, angle, positional information, prevent robot from causing rigid collision.
See accompanying drawing 7, the steering wheel 11 that the utility model is selected is digital rudder controller, and such digital rudder controller is made up of brshless DC motor, back gear, motor-drive circuit, feedback circuit four part.Described digital rudder controller rotates as forearm 4 pitching, palm 6, wrist 5 pitching, point 7 foldings, execution unit that road wheel 8 rotates five actions, there are joint pattern and wheeled pattern two kinds of mode of operations; Joint pattern can be used for driving forearm 4 pitching, wrist 5 pitching, palm 6 to rotate, point 7 opening and closing movements, and wheeled pattern is used for the rotation of ground-engaging wheel 8, and the control data bag sent by slave computer of choosing of mode of operation is determined; Each steering wheel 11 is first connected with slave computer by the series connection of RS485 bus again, and the communication of slave computer and steering wheel 11 is realized by packet.Brshless DC motor and the deceleration device of described digital rudder controller are the integrated design, and its output shaft is connected with driving gear; Motor-drive circuit is connected with brshless DC motor thus controls its rotation and realizes position control; Feedback circuit detects the rotation of motor and feeds back to slave computer.
The slave computer of described steering wheel 11, as single-chip microcomputer, accepts the instruction of host computer and decipher, the group's steering wheel be cascaded is sent to again by MAX485 level shifting circuit, ID in group's steering wheel reading command, then corresponding steering wheel 11 performs instruction, drives arm action.Described steering wheel 11 host computer, as built-in industrial control machine PC104, gather the feedback such as force-sensing sensor, angular displacement sensor, the limit sensors joint power, angle, the positional information that are arranged on arm joint, formation control instruction also sends to slave computer, and the communication of host computer and slave computer is realized by the form such as serial communication, bus.
Claims (8)
1. based on high voltage power transmission line walking and the work machine human arm of servo driving, it is characterized in that, comprise shoulder (1), large arm (2), ancon (3), forearm (4), wrist (5), palm (6), finger (7), road wheel (8) and Power Drive Unit;
Described large arm (2) is shell structure; forearm (4) is double plate structure; large arm (2) one end is connected with shoulder (1) by precision rotation axle system driving mechanism; the one end being connected on forearm (4) in the other end forms ancon (3), and described large arm (2) is connected by connecting axle A (12) with forearm (4) both sides, contact position; Described forearm (4) is fixedly connected with described connecting axle A (12) by key, described large arm (2) and forearm (4) inner side are provided with Power Drive Unit described in a group, drive the relative large arm (2) of described forearm (4) to do elevating movement;
Described wrist (5) is shell structure, be connected in described wrist (5) outside the other end of described forearm (4), described forearm (4) is connected by connecting axle B (13) with wrist (5) both sides, contact position, described forearm (4) is fixedly connected with described connecting axle B (13) by key, wrist (5) inwall is provided with Power Drive Unit described in a group, drives the relative forearm (4) of described wrist (5) to do elevating movement;
Described palm (6) is shell structure, the other end of described wrist (5) is connected by rotating shaft A (14) with one section of described palm (6), described rotating shaft A (14) is positioned on the common centreline of palm (6) and wrist (5), described palm (6) inside is provided with Power Drive Unit described in a group, drives described palm (6) to rotate relative to wrist (5);
Described finger (7) is framed plate structure, two described fingers (7) are arranged on the both sides of palm (6) other end, described finger (7) is connected with palm (6) by connecting plate, described connecting plate one end is connected by four-bar linkage structure with described finger (7), palm (6) is connected by Zhou Xi mechanism with between four-bar linkage structure, the other end is connected with described palm (6) by connecting axle C (15), described connecting plate is fixedly connected with described connecting axle C (15), described palm (6) inner side is provided with one group of Power Drive Unit, two described fingers (7) are driven to do open and close movement relative to palm (6),
Two relative described finger (7) inner sides are connected with a road wheel (8) respectively by rotating shaft B (16), described road wheel (8) is fixedly connected with described rotating shaft B (16) by key, described finger (7) inner side is provided with one group of Power Drive Unit, drives described road wheel (8) to rotate relative to finger (7).
2. the high voltage power transmission line walking based on servo driving according to claim 1 and work machine human arm, it is characterized in that, described Power Drive Unit comprises steering wheel (11) and gear drive (9), described gear drive (9) comprises driving gear and driven gear, described steering wheel (11) is fixed on steering wheel end cap (10), described driving gear is fixed on steering wheel, described driving gear and driven gear engagement.
3. the high voltage power transmission line walking based on servo driving according to claim 2 and work machine human arm, it is characterized in that, the relative large arm (2) of described forearm (4) is done elevating movement and is specially: described connecting axle A (12) is fixedly connected with described driven gear by key.
4. the high voltage power transmission line walking based on servo driving according to claim 2 and work machine human arm, it is characterized in that, the relative forearm (4) of described wrist (5) does elevating movement and is specially: described connecting axle B (13) is fixedly connected with described driven gear by key.
5. the high voltage power transmission line walking based on servo driving according to claim 2 and work machine human arm, it is characterized in that, described palm (6) rotates relative to wrist (5) and is specially: described wrist (5) is fixedly connected with described driven gear.
6. the high voltage power transmission line walking based on servo driving according to claim 2 and work machine human arm, it is characterized in that, two described fingers (7) are done open and close movement relative to palm (6) and are specially: two described connecting axle C (15) are fixedly connected with a described driven gear respectively by key, and the output shaft of described steering wheel (11) is parallel and coplanar with described connecting axle C (15).
7. the high voltage power transmission line walking based on servo driving according to claim 2 and work machine human arm, it is characterized in that, described road wheel (8) rotates relative to finger (7) and is specially: described rotating shaft B (16) is fixedly connected with described driven gear by key.
8. according to the high voltage power transmission line walking based on servo driving in claim 1-7 described in any one and work machine human arm, it is characterized in that, described robot arm also comprises photoelectric sensor, described photoelectric sensor is arranged on each movable joint position, each interarticular joint mechanics of Real-Time Monitoring, angle, positional information.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201520948707.5U CN205184783U (en) | 2015-11-25 | 2015-11-25 | High -tension transmission patrols line and work robot arm based on steering engine driving |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201520948707.5U CN205184783U (en) | 2015-11-25 | 2015-11-25 | High -tension transmission patrols line and work robot arm based on steering engine driving |
Publications (1)
Publication Number | Publication Date |
---|---|
CN205184783U true CN205184783U (en) | 2016-04-27 |
Family
ID=55777813
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201520948707.5U Expired - Fee Related CN205184783U (en) | 2015-11-25 | 2015-11-25 | High -tension transmission patrols line and work robot arm based on steering engine driving |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN205184783U (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105364925A (en) * | 2015-11-25 | 2016-03-02 | 长春理工大学 | Servo driving-based high-voltage electricity transmission line patrol and operation robot arm |
-
2015
- 2015-11-25 CN CN201520948707.5U patent/CN205184783U/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105364925A (en) * | 2015-11-25 | 2016-03-02 | 长春理工大学 | Servo driving-based high-voltage electricity transmission line patrol and operation robot arm |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN106945739B (en) | A kind of barrier-crossing wall-climbing robot with wall surface conversion function | |
CN206732997U (en) | Organ removing manipulator, arm | |
CN203839819U (en) | Obstacle surmounting mechanical arm suitable for power transmission line inspection robot | |
CN103707292A (en) | Six-degree-of-freedom industrial robot based on X-Y-Z rectangular coordinate joint and posture wrist | |
CN206643936U (en) | A kind of rotary overhead line operation robot architecture of fuselage and robot | |
CN205097207U (en) | A series connection elastic drive ware for robot joint | |
CN106945023A (en) | Organ removing manipulator, arm and method | |
CN105364925A (en) | Servo driving-based high-voltage electricity transmission line patrol and operation robot arm | |
CN204076277U (en) | A kind of joint of robot | |
CN208409892U (en) | A kind of substation comprehensive detection machine people | |
CN110161852B (en) | Moving mechanical arm motion control method based on second-order sliding mode algorithm | |
CN209215939U (en) | A kind of all-around mobile intelligent carriage based on ROS system | |
CN208100398U (en) | A kind of ball shape robot structure | |
CN205184783U (en) | High -tension transmission patrols line and work robot arm based on steering engine driving | |
CN107322582A (en) | A kind of six degree of freedom biomimetic manipulator | |
CN201808064U (en) | Single degree of freedom rotating device | |
CN206475201U (en) | A kind of ball-joint connecting rod driving multi-joint anthropomorphic manipulator and robot | |
CN105904456A (en) | Handheld force feedback device and force sense reproduction method using same | |
CN106826899A (en) | A kind of Apery manipulator based on axle transmission refers to structure | |
CN103302678B (en) | A kind of wrist joint of robot | |
CN102581848B (en) | Parallel positioning platform with three-rotation one-translation freedom degree | |
CN207616572U (en) | Parallel three NC axes tilter | |
CN204487596U (en) | Based on the New Type of Robot Arm in double inclined plane deflection joint | |
CN203738813U (en) | Multi-joint humanoid piano-playing robot arm | |
CN102126220A (en) | Control system for six-degree-of-freedom mechanical arm of humanoid robot based on field bus |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
C14 | Grant of patent or utility model | ||
GR01 | Patent grant | ||
CF01 | Termination of patent right due to non-payment of annual fee | ||
CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160427 Termination date: 20171125 |