CN103353292B - Overall bolt stretching machine amount of tension self-operated measuring unit - Google Patents
Overall bolt stretching machine amount of tension self-operated measuring unit Download PDFInfo
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- CN103353292B CN103353292B CN201310321439.XA CN201310321439A CN103353292B CN 103353292 B CN103353292 B CN 103353292B CN 201310321439 A CN201310321439 A CN 201310321439A CN 103353292 B CN103353292 B CN 103353292B
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Abstract
The invention belongs to electromechanical integration technology area, be specifically related to a kind of self-operated measuring unit.A kind of overall bolt stretching machine amount of tension self-operated measuring unit, its technical scheme comprises: actuating unit and control device; Control device controls actuating unit according to set program, thus realizes the measurement to the amount of tension of bolt stretching machine; Achieve in limited narrow space to bolt stretching amount accurate, efficient, safe, automatically measure, shorten the hold-up time of personnel under radiation environment, decrease the radiation dose that it accepts, protect the health of operating personnel.Meanwhile, technique can be transplanted to the automatic measurement of other rugged surroundings, compensate for domestic techno-absence in this regard.
Description
Technical field
The invention belongs to electromechanical integration technology area, be specifically related to a kind of self-operated measuring unit.
Background technology
Overall bolt stretching machine is the special electromechanical integration apparatus of nuclear power station closing pressure container cap, it is by the bottom of locking kingbolt, and by hydraulic power, top is elongated, make kingbolt produce elastic deformation thus produce pretightning force, in the whole process of hydraulic tensioning, need to rely on the elongation of amount of tension measuring system to kingbolt to monitor all the time, and the data of elongation are transferred on control desk.Existing elongation measurement mechanism is be placed in the back up pad outside workbench when not using, and the magnet adsorption bottom dependence elongation measurement mechanism on the supporting plate, is firmly deposited, had 58 covers, corresponding 58 kingbolts.In use, need operating personnel manually to be extracted from back up pad by elongation measurement mechanism, lay out outside workbench, decline and be put on kingbolt.The support of elongation measurement mechanism contacts with kingbolt top surface.The push rod of elongation measurement mechanism contacts with the core bar of kingbolt inside.When being stretched according to kingbolt, inner core pole length is constant, produces the principle of a range difference, realizes the measurement of kingbolt elongation.
Because place, measuring position environment has certain radiation, and the number of meter is more, operating personnel will be caused in radiation environment to be detained the long period, thus increase the radiation dose of operating personnel, cause damage to healthy iff artificial placement.Application number be 201310010466.5 Chinese patent application disclose a kind of changes of magnetic field utilizing magnetic head to measure the magnetic lattices of piston rod when stretching, the lead lag relationship of analysis of magnetic field signal and alternately change frequency, draw the method for telescopic direction and elongation, what this measuring method adopted is electromagnetic principle, under nuclear radiation environment, can disturb to the performance of electromagnetic product, in addition the mechanical hook-up designed by it cannot be fixed on measuring junction automatically, thus cannot reach the object automatically measured.
Summary of the invention
The object of the invention is: for making up the deficiencies in the prior art, providing one can self-operated measuring unit, in limited narrow space, realize the automatic measurement to overall bolt stretching machine amount of tension.
Technical scheme of the present invention is: a kind of overall bolt stretching machine amount of tension self-operated measuring unit, and it comprises: actuating unit and control device; Wherein,
Actuating unit comprises: fixed head, semi-girder, coiling cap, limit switch A, limit switch B, joint motor A, joint motor B, bracket, adapter and meter;
Fixed head is L-type structure, and its horizontal component is provided with through hole, and vertical portion is provided with mounting hole, and the upper surface of horizontal component also has gear block;
The surface of semi-girder is provided with three, left, center, right through hole, and the end face in the left side of semi-girder is provided with limited block;
Bracket is arranged on the lower surface of fixed head, is provided with U-type groove bottom it;
Limit switch A is arranged on the upper surface of fixed head;
Limit switch B is arranged on bracket, and its contact is higher than the upper surface of fixed head;
Joint motor A is fixedly mounted on the lower surface of fixed head, and its output shaft is through the through hole on fixed head, and semi-girder is fixedly connected with by the output shaft of the through hole on the left of it with joint motor A;
Joint motor B is fixedly mounted on the lower surface of semi-girder, and its output shaft passes the through hole in the middle of semi-girder and is fixedly connected with coiling cap;
Cotton rope on coiling cap is connected with adapter through the through hole on the right side of semi-girder;
Meter is arranged on adapter;
When semi-girder rotates, can come in contact with the contact of limit switch A, limit switch B respectively;
Control device comprises: industrial computer, FPGA, data conversion module A, data conversion module B, Current amplifier modules A, Current amplifier module B, current detection module A and current detection module B;
In FPGA, write performs fixed routine, and industrial computer is for showing the measurement data from meter;
Industrial computer is connected with data conversion module A by CAN data bus; Data conversion module A and FPGA connects; Meter is connected to FPGA by data conversion module B; The output signal of FPGA divides two-way to connect Current amplifier modules A and Current amplifier module B respectively; Current amplifier modules A connects the joint motor A in actuating unit, and Current amplifier module B connects the joint motor B in actuating unit; Current detection module A is connected with joint motor A and FPGA, and current detection module B is connected with joint motor B and FPGA;
Limit switch A is connected with FPGA respectively with limit switch B, when the contact of limit switch A or limit switch B is touched, sends the signal stopping joint motor A to FPGA.
The invention has the beneficial effects as follows: (1) achieve in limited narrow space to bolt stretching amount accurate, efficient, safe, automatically measure; shorten the hold-up time of personnel under radiation environment; decrease the radiation dose that it accepts, protect the health of operating personnel.Meanwhile, technique can be transplanted to the automatic measurement of other rugged surroundings, compensate for domestic techno-absence in this regard.
(2) use flexible cords to place meter, increase redundancy, avoid physical construction firmly to contact the device damage brought, greatly promote accuracy of measurement simultaneously.
(3) mechanical arm rotational angle adopts mechanical position limitation, and switch is spacing, the measure of Current Control triple protection, ensures the job safety under nuclear industry environment.
(4) data collection processor uses the system architecture that FPGA is core, and effective guarantee controls jumbo end-equipment and data acquisition.
Accompanying drawing explanation
Fig. 1 is actuating unit structural representation in the present invention;
Fig. 2 is control device structured flowchart in the present invention;
Fig. 3 be in the present invention actuating unit from initial bit to measuring the motion schematic diagram of position;
Fig. 4 be in the present invention actuating unit from measuring position to the motion schematic diagram of initial bit;
Fig. 5 is that in the present invention, actuating unit is arranged on the structural representation on circuit orbit;
Wherein: 1-fixed head, 2-semi-girder, 3-coiling cap, 4-limit switch A, 5-limit switch B, 6-joint motor A, 7-shutdown motor B, 8-bracket, 9-adapter.
Embodiment
A kind of overall bolt stretching machine amount of tension self-operated measuring unit, it comprises: actuating unit and control device; Wherein,
See accompanying drawing 1, actuating unit comprises: fixed head 1, semi-girder 2, coiling cap 3, limit switch A4, limit switch B5, joint motor A6, shutdown motor B7, bracket 8, adapter 9 and meter;
Fixed head 1 is L-type structure, and its horizontal component is provided with through hole, and vertical portion is provided with mounting hole, and the upper surface of horizontal component also has gear block;
The surface of semi-girder 2 is provided with three, left, center, right through hole, and the end face in the left side of semi-girder 2 is provided with limited block;
Bracket 8 is arranged on the lower surface of fixed head 1, is provided with U-type groove bottom it;
Limit switch A4 is arranged on the upper surface of fixed head 1;
Limit switch B5 is arranged on bracket 8, and its contact is higher than the upper surface of fixed head 1;
Joint motor A6 is fixedly mounted on the lower surface of fixed head 1, and its output shaft is through the through hole on fixed head 1, and semi-girder 2 is fixedly connected with by the output shaft of the through hole on the left of it with joint motor A6;
Joint motor A6 is fixedly mounted on the lower surface of fixed head 1, and its output shaft is through the through hole on fixed head 1, and semi-girder 2 is fixedly connected with by the output shaft of the through hole on the left of it with joint motor A6;
Joint motor B7 is fixedly mounted on the lower surface of semi-girder 2, and its output shaft passes the through hole in the middle of semi-girder 2 and is fixedly connected with coiling cap 3;
Cotton rope on coiling cap 3 is connected with adapter through the through hole on the right side of semi-girder 2;
Meter is arranged on adapter, and meter is for measuring the elongation of kingbolt, and adapter provides suitable working power for meter;
When semi-girder 2 rotates, can come in contact with the contact of limit switch A4, limit switch B5 respectively;
See accompanying drawing 2, control device comprises: industrial computer, FPGA, data conversion module A, data conversion module B, Current amplifier modules A, Current amplifier module B, current detection module A and current detection module B;
In FPGA, write performs fixed routine, and industrial computer is for showing the measurement data from meter;
Industrial computer is connected with data conversion module A by CAN data bus; Data conversion module A and FPGA connects; Meter is connected to FPGA by data conversion module B; The output signal of FPGA divides two-way to connect Current amplifier modules A and Current amplifier module B respectively; Current amplifier modules A connects the joint motor A6 in actuating unit, and Current amplifier module B connects the joint motor B7 in actuating unit; Current detection module A is connected with joint motor A6 and FPGA, and current detection module B is connected with joint motor B7 and FPGA;
Limit switch A4 is connected with FPGA respectively with limit switch B5, when the contact of limit switch A4 or limit switch B5 is touched, sends the signal stopping joint motor A6 to FPGA.
The course of work of overall bolt stretching machine amount of tension self-operated measuring unit is:
During initial position, adapter is placed in the U-type groove of bracket 8; Staff sends the instruction of executive routine to FPGA by industrial computer;
See accompanying drawing 3, A.FPGA is controlled joint motor B7 by Current amplifier module B, and the output shaft of joint motor B7 drives coiling cap 3 to rotate, and coiling cap 3 performs take-up action, adapter 9 and meter start to rise, and the time of rising is controlled by the timing unit in FPGA;
B.FPGA stops the motion of joint motor B7, by Current amplifier modules A, joint motor A6 is controlled, the output shaft of joint motor A6 drives semi-girder 2 to rotate to measurement position, when the limited block on semi-girder 2 contacts with limit switch A4, joint motor A6 stop motion, now, adapter 9 and meter are positioned at and measure directly over position;
C.FPGA is controlled joint motor B7 by Current amplifier module B again, the output shaft of joint motor B7 drives the reverse rotation of coiling cap 3, coiling cap 3 performs unwrapping wire action, and adapter 9 and meter start to decline, and the time of decline is controlled by the timing unit in FPGA;
D., when adapter 9 reaches measuring position with meter, FPGA stops the motion of joint motor B7, and meter starts to measure, and is shown to industrial computer by data transfer;
After completing see accompanying drawing 4, E. measurement, FPGA is controlled joint motor B7 by Current amplifier module B, the output shaft of joint motor B7 drives coiling cap 3 to rotate, coiling cap 3 performs take-up action, and adapter 9 and meter start to rise, and the time of rising is controlled by the timing unit in FPGA;
F.FPGA stops the motion of joint motor B7, by Current amplifier modules A, joint motor A6 is controlled, the output shaft of joint motor A6 drives semi-girder 2 to rotate to placement position, when semi-girder 2 contacts with limit switch B5, joint motor A6 stop motion, now, adapter 9 and meter be positioned at bracket 8 U-type groove on directly over;
G.FPGA is controlled joint motor B7 by Current amplifier module B, the output shaft of joint motor B7 drives the reverse rotation of coiling cap 3, coiling cap 3 performs unwrapping wire action, and adapter 9 and meter start to decline, and the time of decline is controlled by the timing unit in FPGA; When adapter 9 contacts with U-type groove, FPGA stops the motion of joint motor B7;
In said process, if limit switch A4 lost efficacy, stopping cannot be carried out to joint motor A6 and control, after the gear block on the limited block on semi-girder 2 and fixed head 1 comes in contact, realize mechanical position limitation;
Current detection module A and current detection module B Real-Time Monitoring joint motor A6 and the curent change situation in shutdown motor B7, if there is current anomaly situation, current detection module A or current detection module B sends the signal of interrupt routine to FPGA.
Preferably, can arrange the limit switch C controlled shutdown motor B7 at semi-girder 2 place, when limit switch C touched by adapter 9, B7 is out of service for shutdown motor.
When reality uses, 58 actuating units are equally spaced to be arranged on circular guideway, and corresponding 58 kingbolts, when off working state, integral device is hidden in the below of circular guideway, thus avoids interference the normal use of overall bolt tension machine equipment.
Claims (4)
1. an overall bolt stretching machine amount of tension self-operated measuring unit, it is characterized in that, it comprises: actuating unit and control device; Wherein,
Described actuating unit comprises: fixed head (1), semi-girder (2), coiling cap (3), limit switch A (4), limit switch B (5), joint motor A (6), joint motor B (7), bracket (8), adapter (9) and meter;
Described fixed head (1) is L-type structure, and its horizontal component is provided with through hole, and vertical portion is provided with mounting hole, and the upper surface of described horizontal component also has gear block;
The surface of described semi-girder (2) is provided with three, left, center, right through hole, and the end face in the left side of described semi-girder (2) is provided with limited block;
Described bracket (8) is arranged on the lower surface of described fixed head (1), is provided with U-type groove bottom it;
Described limit switch A (4) is arranged on the upper surface of described fixed head (1);
Described limit switch B (5) is arranged on described bracket (8), and its contact is higher than the upper surface of described fixed head (1);
Described joint motor A (6) is fixedly mounted on the lower surface of described fixed head (1), its output shaft is through the through hole on described fixed head (1), and described semi-girder (2) is fixedly connected with by the output shaft of the through hole on the left of it with described joint motor A (6);
Described joint motor B (7) is fixedly mounted on the lower surface of described semi-girder (2), and its output shaft passes the through hole in the middle of described semi-girder (2) and is fixedly connected with described coiling cap (3);
Cotton rope on described coiling cap (3) is connected with described adapter (9) through the through hole on described semi-girder (2) right side;
Described meter is arranged on described adapter;
When described semi-girder (2) rotates, can come in contact with the contact of described limit switch A (4), limit switch B (5) and described gear block respectively;
Control device comprises: industrial computer, FPGA, data conversion module A, data conversion module B, Current amplifier modules A, Current amplifier module B, current detection module A and current detection module B;
In described FPGA, write performs fixed routine, and described industrial computer is for showing the measurement data from described meter;
Described industrial computer is connected with described data conversion module A by CAN data bus; Described data conversion module A is connected with described FPGA; Described meter is connected to described FPGA by described data conversion module B; The output signal of described FPGA divides two-way to connect described Current amplifier modules A and described Current amplifier module B respectively; Described Current amplifier modules A connects the joint motor A (6) in described actuating unit, and described Current amplifier module B connects the joint motor B (7) in described actuating unit; Described current detection module A is connected with described joint motor A (6) and described FPGA, and described current detection module B is connected with described joint motor B (7) and described FPGA;
Described limit switch A (4) is connected with described FPGA respectively with described limit switch B (5), when the contact of described limit switch A (4) or described limit switch B (5) is touched, send the signal stopping described joint motor A (6) to described FPGA.
2. a kind of overall bolt stretching machine amount of tension self-operated measuring unit as claimed in claim 1, is characterized in that, the course of work of described overall bolt stretching machine amount of tension self-operated measuring unit is:
During initial position, described adapter is placed in the U-type groove of described bracket (8); Staff sends the instruction of executive routine to described FPGA by described industrial computer;
A. described FPGA is controlled described joint motor B (7) by described Current amplifier module B, the output shaft of described joint motor B (7) drives described coiling cap (3) to rotate, described coiling cap (3) performs take-up action, described adapter (9) and described meter start to rise, and the time of rising is controlled by the timing unit in described FPGA;
B. described FPGA stops the motion of described joint motor B (7), by described Current amplifier modules A, described joint motor A (6) is controlled, the output shaft of described joint motor A (6) drives described semi-girder (2) to rotate to measurement position, when the limited block on described semi-girder (2) contacts with described limit switch A (4), the stop motion of described joint motor A (6), now, described adapter (9) and described meter are positioned at and measure directly over position;
C. described FPGA is controlled described joint motor B (7) by described Current amplifier module B again, the output shaft of described joint motor B (7) drives the reverse rotation of described coiling cap (3), described coiling cap (3) performs unwrapping wire action, described adapter (9) and described meter start to decline, and the time of decline is controlled by the timing unit in described FPGA;
D. when adapter (9) reaches measuring position with described meter, described FPGA stops the motion of described joint motor B (7), and described meter starts to measure, and is shown by data transfer to described industrial computer;
E. after having measured, described FPGA is controlled described joint motor B (7) by described Current amplifier module B, the output shaft of described joint motor B (7) drives described coiling cap (3) to rotate, described coiling cap (3) performs take-up action, described adapter (9) and described meter start to rise, and the time of rising is controlled by the timing unit in described FPGA;
F. described FPGA stops the motion of described joint motor B (7), by described Current amplifier modules A, described joint motor A (6) is controlled, the output shaft of described joint motor A (6) drives described semi-girder (2) to rotate to placement position, when described semi-girder (2) contacts with described limit switch B (5), the stop motion of described joint motor A (6), now, described adapter (9) and described meter be positioned at described bracket (8) U-type groove on directly over;
G. described FPGA is controlled described joint motor B (7) by described Current amplifier module B, the output shaft of described joint motor B (7) drives the reverse rotation of described coiling cap (3), described coiling cap (3) performs unwrapping wire action, described adapter (9) and described meter start to decline, and the time of decline is controlled by the timing unit in described FPGA; When described adapter (9) contacts with described U-type groove, described FPGA stops the motion of described joint motor B (7);
In said process, if described limit switch A (4) was lost efficacy, stopping cannot be carried out to described joint motor A (6) to control, after the gear block on the limited block on described semi-girder (2) and described fixed head (1) comes in contact, realize mechanical position limitation;
Joint motor A (6) described in described current detection module A and described current detection module B Real-Time Monitoring and the curent change situation in described joint motor B (7), if there is current anomaly situation, described current detection module A or described current detection module B sends the signal of interrupt routine to described FPGA.
3. a kind of overall bolt stretching machine amount of tension self-operated measuring unit as claimed in claim 1 or 2, it is characterized in that, the limit switch C controlled described joint motor B (7) is set at described semi-girder (2) place, when described limit switch C touched by described adapter (9), described joint motor B (7) is out of service.
4. a kind of overall bolt stretching machine amount of tension self-operated measuring unit as claimed in claim 1 or 2, is characterized in that, 58 described actuating units are equally spaced to be arranged on circular guideway, corresponding 58 kingbolts.
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| CN201310321439.XA CN103353292B (en) | 2013-07-29 | 2013-07-29 | Overall bolt stretching machine amount of tension self-operated measuring unit |
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| CN201310321439.XA CN103353292B (en) | 2013-07-29 | 2013-07-29 | Overall bolt stretching machine amount of tension self-operated measuring unit |
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| CN103353292A CN103353292A (en) | 2013-10-16 |
| CN103353292B true CN103353292B (en) | 2016-02-24 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104751621B (en) * | 2013-12-31 | 2018-04-27 | 中核武汉核电运行技术股份有限公司 | A kind of digital metering instrument Infrared Transmission system for bolt stretching machine |
| CN107877120B (en) * | 2017-12-13 | 2023-06-27 | 国家电网公司 | Quick assembly disassembly equipment of ball valve telescopic joint |
| CN111351457B (en) * | 2020-02-21 | 2022-01-25 | 国家电网有限公司 | Method and device for measuring residual elongation of top cover bolt of pumped storage unit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2517051A1 (en) * | 1981-11-24 | 1983-05-27 | Ckd Praha | SCREW ELONGATION MEASURING DEVICE |
| DE4227817A1 (en) * | 1992-08-21 | 1994-02-24 | Eos Electro Optical Syst | Coordinate measuring machine for surface measurement - has holder of three=dimensional positioning system for alternately mounting probe or Moire measurement head |
| CN200968840Y (en) * | 2006-11-08 | 2007-10-31 | 哈尔滨汽轮机厂有限责任公司 | Apparatus for measuring screw bolt elongation amount for steam turbine assembly measurement |
| CN103063123A (en) * | 2013-01-11 | 2013-04-24 | 中国矿业大学 | Hydraulic cylinder length extension measuring device and method |
-
2013
- 2013-07-29 CN CN201310321439.XA patent/CN103353292B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2517051A1 (en) * | 1981-11-24 | 1983-05-27 | Ckd Praha | SCREW ELONGATION MEASURING DEVICE |
| DE4227817A1 (en) * | 1992-08-21 | 1994-02-24 | Eos Electro Optical Syst | Coordinate measuring machine for surface measurement - has holder of three=dimensional positioning system for alternately mounting probe or Moire measurement head |
| CN200968840Y (en) * | 2006-11-08 | 2007-10-31 | 哈尔滨汽轮机厂有限责任公司 | Apparatus for measuring screw bolt elongation amount for steam turbine assembly measurement |
| CN103063123A (en) * | 2013-01-11 | 2013-04-24 | 中国矿业大学 | Hydraulic cylinder length extension measuring device and method |
Non-Patent Citations (1)
| Title |
|---|
| 汽轮机汽缸中分面螺栓伸长量测量方法及应用;赵立海;《汽轮机技术》;20090630;第51卷(第3期);第239-240页 * |
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