Summary of the invention
The present invention is for solving the problems of the technologies described above, a kind of multitube road transmission line automatic control system is provided, this system can have the machining production line of three process to control automatically to one, can satisfy the pipeline different to each batch length, automatically control, synchronization has pipeline in processing on the per pass operation, and each duct section phenomenon such as knock into the back that mustn't bump.
Technical scheme of the present invention is as follows:
Multitube road transmission line automatic control system is characterized in that: the transmission line of described system comprises workshop section one, workshop section two and workshop section three, and workshop section one is positioned at the front end of workshop section two, and workshop section three is positioned at the end of workshop section two; Be disposed with operation one, operation two, operation three from workshop section one to workshop section three, respectively the pipeline on the transmission line carried out difference processing by three process;
From the front end of transmission line, through operation again and again to being workshop section one operation two, be workshop section two three from operation two to operation, the end from operation three to transmission line is workshop section three; Power wheel on the transmission line of described workshop section one, workshop section two, workshop section's three difference correspondences is driven by frequency converter one, frequency converter two, the frequency converter three of correspondence respectively;
Also be provided with on the described transmission line: for detection of pipeline whether be lowered to the power wheel near switch one, for detection of the position of pipeline near switch two, near switch three, near switch four; Describedly be installed on the front end of workshop section one near switch one, be installed on the front end of operation one near switch two, be installed on the front end of operation two near switch three, be installed on the front end of operation three near switch four.
Described system is provided with PLC, detects all near the time of switch connection by PLC, goes out the length of pipeline with detected data computation, and according to the correlation time that the length gauge of the pipeline that calculates is calculated the per pass operation, controls the start and stop of per pass operation simultaneously; And all frequency converters are finished regularly start and stop, stepless speed regulation, multistage speed control system according to the instruction that PLC sends.
The course of work of a pipeline of described system transmissions is as follows:
The first step, in workshop section one:
Pipeline is transferred to power wheel by tube-grasping device, and pipeline stops reliable, the center of pipeline bottom surface with overlap near switch one, be S near switch one to the distance of transmission line front end
5Detect power wheel on existing pipeline near switch one this moment, sends instruction by PLC and start frequency converter one, and frequency converter one drives the power wheel of workshop section one, and power wheel drives pipeline and moves;
At first, through acceleration time t
2After, the speed that pipeline moves is V
1, the output frequency of frequency converter one is f
1, pipeline advance apart from S
4For:
Pipeline continues with speed V
1At the uniform velocity move ahead until touching near switch two, the time of advancing is t
3, the distance of advancing is:
Then, pipeline is with speed V
1By the processing of operation one, the time of passing through is t
4Pipeline is finished the distance that the processing of operation one moves:
, duct length is L; So far, pipeline is finished the processing of operation one;
Then, after the variable-speed processing of frequency converter one, pipeline is through time t
5After speed be V
2, this moment, frequency converter one output frequency was f
2:
, the distance of advancing is:
After this, pipeline is with speed V
2Travel at the uniform speed to operation two places, elapsed time t
6, the distance of operation is:
Enter workshop section two, before entering workshop section two, workshop section two has started, and the speed of workshop section two is identical with the speed of workshop section one, is V
2Pipeline is with speed V
2Elapsed time t
7, by operation two, finish the processing of operation two, the distance of advancing around here is:
Second step, in workshop section two:
At first, the power wheel of workshop section two is by static startup, through time t
10After the acceleration, the output frequency of frequency converter two is f
3, the speed of transmission pipeline is
In order to guarantee the smooth and easy processing by operation two of pipeline, so that the power wheel of workshop section two with speed V
2Stable operation; The power wheel parallel-adder settle-out time t of workshop section two
11After, pipeline touches near switch three, becomes connection near switch three by disconnection, and pipeline begins to enter workshop section two, wherein
When pipeline entered operation two, speed was V
2, be t in the process time of operation two
7, the distance of advancing is:
, so far, pipeline is finished the processing of operation two and is broken away from workshop section one fully;
Then, after the variable-speed processing of frequency converter two, pipeline is through time t
12After speed be V
3, this moment, the output frequency of frequency converter two was f
4, the distance of advancing is:
After this, pipeline is with speed V
3At the uniform velocity continue to move, through time t
13After, the distance that pipeline is advanced is:
, prepare to enter workshop section three, before entering workshop section three, workshop section three has started, and the speed of workshop section three is identical with the speed of workshop section two, is V
3Pipeline is with speed V
3Continue to move ahead, through time t
14After, pipeline breaks away from workshop section two fully, all enters workshop section three, and the distance of advancing around here is:
The 3rd step, in workshop section three:
At first, the power wheel of workshop section three is by static startup, through time t
17After the acceleration, the output frequency of frequency converter three is f
5, the speed of pipeline transmission is
Because the motor number of pole-pairs of whole transmission line, reduction gear ratio are all identical, in conjunction with formula
, can draw f
4=f
5Be to guarantee the smooth and easy processing by operation three of pipeline, so must make the speed of workshop section three with V
3Stable operation is through time t
18After, pipeline touches near switch four, becomes connection near switch four by disconnection, and pipeline begins to enter workshop section three, wherein
When pipeline entered workshop section three, speed was V
3, be t in the process time of operation three
14, the distance of advancing is:
, so far, pipeline is finished the processing of operation three and is broken away from workshop section two fully, becomes disconnection near switch four by connection simultaneously;
Then, after pipeline broke away from workshop section two fully and namely all enters workshop section three, the time that pipeline at the uniform velocity moves ahead with speed V3 was t20, and mobile distance is:
, PLC sends to instruct and makes frequency converter three carry out the reduction of speed processing then, the movement of elapsed time t19, and speed is zero, and pipeline stops then, and the distance that this process pipeline moves is:
Before pipeline slowed down, pipeline was always with the at the uniform velocity preceding line time t of speed V3
20, the distance of operation is
After pipeline stops, through time t
21After, pipeline is gone out pipe unit and is lifted away from transmission line.
In the first step, when pipeline all enters workshop section two, namely pipeline breaks away from workshop section for the moment fully, and frequency converter slows down at the beginning, and the power wheel of workshop section one reduces speed now, through time t
8After, the power wheel deceleration of workshop section one is zero and stops reliable; Stand-by period t
9After, PLC sends instruction, and the upper end of workshop section one begins to transfer another pipeline, through time t
1After, described another pipeline is put to the power wheel of workshop section one, and stops reliablely, and workshop section one carries out periodic duty.
In second step, when pipeline all enters workshop section three, when namely pipeline broke away from workshop section two fully, frequency converter two reduced speed now, and the power wheel of workshop section two reduces speed now, through time t
15After, the power wheel deceleration of workshop section two is zero and stops reliable; Stand-by period t
16After, PLC sends instruction, starts the power wheel of workshop section two, through time t
10After the acceleration, the transmission speed of the power wheel of workshop section two is V
2, and with this speed operation t
11After, continue acceptance from another pipeline of workshop section one, so carry out the cyclic process of operation two, wherein
In the 3rd step, the time that pipeline is lifted away from transmission line is t
21, the 3rd EOS, stand-by period t
22After, PLC sends instruction and starts frequency converter three, and the power wheel of workshop section three begins again to start, through time t
17After, the speed of the power wheel of workshop section three reaches V
3, and with speed V
3T travels at the uniform speed
18After, continue acceptance from another pipeline of workshop section two, and by this reciprocation cycle, wherein
The cycle of described workshop section one is:
Total length by workshop section one is:
Can get:
Therefore can draw, as the length S of operation one to the transmission line head end
6After determining, for the Guan Junneng that satisfies different length processes at described transmission line, then the length L of the long pipeline that can process of described control system satisfies following relation:
Therefore, the one full segment length S of workshop section
1Satisfy following relation:
So as can be known, when the length of the long pipeline of described control system processing
The time, the shortest length of workshop section one is:
The cycle of operation of described workshop section two is:
The length of described workshop section two full sections is:
In like manner, should satisfy the variation of production specification, shorten production line again, so the bee-line of workshop section two is:
, wherein L is the length that transmission line allows the long pipeline of processing; For short pipeline, then
The cycle of described workshop section three is:
,
The total length of described workshop section three is:
, S wherein
14Be the total displacement of pipeline on the power wheel of workshop section three, the terminal safety allowance stroke of the power wheel of workshop section three is S
18
For satisfying each workshop section pipeline transmission is arranged all, namely at utmost enhance productivity, guarantee simultaneously that every pipeline can not bump to knock into the back, so the cycle between three workshop sections must be satisfied following relation:
For the cycle of workshop section one
, t wherein
1Be to transfer pipeline to the power wheel of workshop section one and stop reliable back before this section power wheel starts, time t from the inlet pipe device
2, t
5, t
8Be the acceleration and deceleration time parameter that frequency converter one arranges, after system debug finished, these three times were also decided, and are considered as fixed value; t
4, t
7Be that length is that the pipeline of L is with speed V
1, V
2By operation one, two used times of operation, for same batch pipeline, L is definite value, V
1, V
2Be the speed that operation one, operation two require, so t
4, t
7Can be considered definite value; For t
3, t
6, can get:
Again because
,
S
7, S
10All can be considered definite value, so for cycle of workshop section one, only need to determine t by PLC according to program and above-mentioned definite value and arithmetic expression
9Get final product, namely PLC is according to above-mentioned time constant, and calculation expression is determined after first pipeline leaves workshop section one, workshop section one power wheel slow down be after zero wait how long, second pipeline transferred by workshop section one.
For the cycle of workshop section two
, t wherein
7, t
14Be that length is that the pipeline of L is with speed V
2, V
3By the used time of operation two, operation three, for same batch pipeline, L is definite value, V respectively
2, V
3Be the speed that operation requires, so t
7, t
14Can be considered definite value; t
10, t
12, t
15Be the acceleration and deceleration time parameter that frequency converter two arranges, after system debug finished, these three times were also decided, and are considered as fixed value; t
11Be for guaranteeing the smooth and easy processing by operation two of pipeline, must making power wheel with speed V
2Stable operation t
11After, the pipeline of workshop section one just enters workshop section two, and this time constant can be set according to technological requirement, is considered as fixed value; t
16For workshop section's two power wheels by V
3After deceleration is zero, wait for the power wheel that how long starts workshop section two, this time constant can be set according to technological requirement, is considered as fixed value; For t
13, in conjunction with formula
, can get:
Again because
, S as can be known
13Be considered as definite value, so for cycle of workshop section two, can be considered by PLC by calculating control t
16Size and the time constant that is directly proportional with duct length L; So can get:
This shows, above-mentioned time constant, algebraic expression are enrolled in the PLC program, satisfy following formula, can realize the automatical and efficient rate processing of pipeline of workshop section one, workshop section two.
For the cycle of workshop section three
, t wherein
17, t
19Be the acceleration and deceleration time parameter that frequency converter three arranges, after system debug finished, these three times were also decided, and are considered as fixed value; t
18Be for guaranteeing the smooth and easy processing by operation three of pipeline, must making workshop section three with speed V
3Stable operation t
18After, the pipeline of workshop section two just enters workshop section three, and this time constant can be set according to technological requirement, is considered as fixed value; t
14Be that length is that the pipeline of L is with speed V
3By the three used times of operation, for same batch pipeline, L is definite value, V
3Be the speed that operation requires, so t
14Can be considered definite value; t
21For after pipeline stops, going out the pipe unit action, through time t
21After, go out pipe unit pipeline is lifted away from the power wheel of workshop section three, be considered as fixed value; t
22For the power wheel of workshop section three by V
3After deceleration is zero, wait for the power wheel that how long starts workshop section three, this time constant can be set according to technological requirement, is considered as fixed value; In conjunction with
, can get:
S wherein
17, S
15Be definite value, so t
20Be definite value; Hence one can see that, and the cycle of workshop section three is to be calculated by program by PLC, control t
22Size and the time constant that is directly proportional with duct length L; So can get:
Described The whole control system also be provided with for safety spacing near switch five, the described end that is installed on transmission line near switch five; When pipeline touches near switch five, become connection near switch five by disconnection, and connection signal is delivered to PLC, PLC sends instruction at once, stops the work of transmission line; In the time of can breaking down in system near switch five, prevent that pipeline from going out transmission line, and then protection equipment and personal safety.
So The whole control system according to mechanical parameter, electric parameter and relational algebra formula, is adjusted the start-stop time of workshop section one, workshop section two, workshop section three by PLC, and calculate the length L of pipeline automatically; According to the signal that sends near switch, send the acceleration and deceleration instruction to frequency converter, and finally satisfy corresponding time, distance according to technological requirement simultaneously, can realize same production line multitube road, multiple speed, high efficiency automatic transmission.
The mechanical drive reduction gear ratio of The whole control system is i, and motor is identical (it is the same model of same brand that ideal is established used motor, and namely parameters such as power, moment, number of pole-pairs p are all identical) all, does not all have relative slip between power wheel and the pipeline; Therefore: according to the speed of power wheel
With
The output frequency that can get frequency converter one is respectively:
,
Speed according to power wheel
Also can get the output frequency of frequency converter two:
Speed according to power wheel
Can get the output frequency of frequency converter two:
Speed according to power wheel
Also can get the output frequency of frequency converter two:
Beneficial effect of the present invention is as follows:
Total system by PLC according to each signal that sends near switch, send the acceleration and deceleration instruction to each frequency converter respectively, and satisfy corresponding time, distance according to technological requirement, can realize same production line multitube road, multiple speed, transmission pipeline automatically expeditiously, can realize that the multistage pipeline carries out a plurality of operation processing simultaneously, and can realize the transmission processing of multiple different size pipeline, and the phenomenon such as knock into the back that in transmission process, can not bump.
Embodiment
Multitube road transmission line automatic control system, described system comprise workshop section one, workshop section two and workshop section three.Workshop section one is positioned at the front end of workshop section two, and workshop section three is near the end of workshop section two; Operation one, operation two, operation three are arranged three successively from workshop section one to workshop section, respectively the pipeline on the transmission line is carried out difference processing by three process; Transmission line be provided with for detection of workshop section one whether pipeline is transferred to the power wheel near switch one, for detection of the position of pipeline near switch two, near switch three, near switch four; Be installed on workshop section one relevant position near switch one, be installed on the front end of operation one near switch two, be installed on the front end of operation two near switch three, be installed on the front end of operation three near switch four.
To being workshop section one operation two, three being workshop section two from operation two to operation from the front end of transmission line, is workshop section three from operation three to line end.The power wheel of workshop section one, workshop section two, workshop section's three correspondences is driven by frequency converter one, frequency converter two, the frequency converter three of correspondence respectively.
Described system is provided with PLC, detects the time near switch connection that arranges on the power wheel by PLC, calculates the length of pipeline with this, and according to the correlation time that the length gauge that calculates is calculated the per pass operation, controls the start and stop of per pass operation simultaneously; And all frequency converters are finished regularly start and stop, stepless speed regulation, multistage speed control system according to the instruction that PLC sends; Be mainly used to detect the position of present pipeline near switch; Frequency converter is finished regularly start and stop, stepless speed regulation, multistage speed control system etc. according to the instruction that PLC sends.
As shown in figure 14, the rate signal of the speed of workshop section one, workshop section two is by providing near switch, and deliver in the PLC input, relatively calculate through its logic, the signal that calculates is delivered to frequency converter, to reach the control to frequency converter start and stop, acceleration and deceleration, finally act on pipeline through motor, speed reduction unit, power wheel, finally reach the control to pipeline speed governing, location.
As shown in Figure 1, it is V1, V2, V3(hypothesis V1>V3>V2) that the per pass operation requires the translational speed of pipeline, and the length of workshop section one is that the length of S1, workshop section two is that the length of S2, workshop section three is S3.
The course of work of a pipeline of described system transmissions is as follows:
The first step, in workshop section one:
The inlet pipe device of workshop section one is through time t
1Pipeline is transferred to power wheel, and pipeline stops reliable, the center of pipeline bottom surface with overlap near switch one, be S near switch one to the distance of power wheel front end
5, detect power wheel on existing pipeline near switch one this moment, sends instruction by PLC and start frequency converter one, and frequency converter one drives the power wheel of workshop section one, and power wheel drives pipeline and moves;
At first, as shown in Figure 2, through acceleration time t
2After, the speed that pipeline moves is V
1, the output frequency of frequency converter one is f
1, pipeline advance apart from S
4For:
Pipeline continues with speed V
1At the uniform velocity move ahead until touching near switch two, the time of advancing is t
3, as shown in Figure 3, the distance of advancing is:
Then, pipeline is with speed V
1By the processing of operation one, the time of passing through is t
4(become connection near switch two by disconnection and pick up counting, till disconnecting again, timing finishes), this time enters PLC, and this length is stored in the PLC, calls in order to work after this; As shown in Figure 4, pipeline is finished the distance that the processing of operation one moves and is:
, duct length is L; So far, pipeline is finished the processing of operation one;
Then, (if V after the variable-speed processing of frequency converter one
1V
2, then slow down; If V
1<V
2, then accelerate), pipeline is through time t
5After speed be V
2, this moment, frequency converter one output frequency was f
2:
, as shown in Figure 5, the distance of advancing is:
After this, pipeline is with speed V
2Travel at the uniform speed to operation two places, elapsed time t
6, the distance of operation is:
, (before entering workshop section two, this section starts, and its speed is identical with first section, is V to enter workshop section two
2).Pipeline is with speed V
2By, elapsed time t
7, finish the processing of operation two, all enter workshop section two, the distance of advancing around here is:
When pipeline all enters workshop section two, namely all break away from workshop section for the moment, workshop section slows down at the beginning, through time t
8, the power wheel deceleration of workshop section one is zero and stops reliable.Stand-by period t
9After, PLC sends instruction, and the inlet pipe device begins to transfer another pipeline, through time t
1, another pipeline is transferred to the transmission line of workshop section one, and stops reliable ..., workshop section one carries out periodic duty by this.
Second step, in workshop section two:
At first, for workshop section two, by static startup, through time t
10After the acceleration, the frequency converter output frequency is f
3, the speed of pipeline transmission is
For guaranteeing the smooth and easy processing by operation two of pipeline, must make workshop section two with speed V
2Stable operation t
11(
) after, the pipeline of workshop section two just touches near switch three, becomes connection near switch three by disconnection, and pipeline begins to enter workshop section two.
When the pipeline on the power wheel of workshop section two entered workshop section two, speed was V
2, be t in the process time of operation two
7, the distance of advancing is:
, so far, pipeline is finished the processing of operation two and is broken away from workshop section one fully;
Break away from workshop section one fully at pipeline, when namely all entering workshop section two, frequency converter slows down at the beginning, elapsed time t
8, the power wheel of workshop section one stops, stand-by period t
9After, PLC sends instruction, and workshop section transfers new pipeline at the beginning, through time t
1, pipeline is transferred to the power wheel of workshop section one, and workshop section one carries out periodic duty according to the first step.
Then, (if V after the variable-speed processing of frequency converter two
2V
3, then slow down; If V
2<V
3, then accelerate), pipeline is through time t
12After speed be V
3, this moment, frequency converter two output frequencies were f
4, as shown in Figure 8, the distance of advancing is:
After this, pipeline is with speed V
3At the uniform velocity continue to move, through time t
13After, the distance that pipeline is advanced is:
, (before entering workshop section three, this section starts, and its speed is identical with second section, is V to prepare to enter workshop section three
3); Pipeline is with speed V
3Continue to move ahead, through time t
14After, pipeline breaks away from workshop section two fully, all enters workshop section three, and the distance of advancing around here is:
When pipeline all enters workshop section three, when namely all breaking away from workshop section two, workshop section's two power wheels reduce speed now, through time t
15After, the power wheel of workshop section two stops reliable.After this wait for t
16After, the power wheel of startup workshop section two is through time t
10After the acceleration, the transmission speed of the power wheel of workshop section two is V
2, and with this speed operation t
11(
) after, accept the pipeline from workshop section one, so carry out the cyclic process of operation two.
The 3rd step, in workshop section three:
At first, by static startup, through time t
17After the acceleration, the frequency converter output frequency is f
5, the speed of pipeline transmission is
Because the motor number of pole-pairs of whole production line, reduction gear ratio are all identical, in conjunction with formula
, can draw f
4=f
5For guaranteeing the smooth and easy processing by operation three of pipeline, must make workshop section three with speed V
3Stable operation t
18(
) after, touch near switch four, become connection near switch four by disconnection, pipeline just begins to enter workshop section three.
When the pipeline of workshop section two enters workshop section three, speed is V
3, be t in the process time of operation three
14, the distance of advancing is:
, so far, pipeline is finished the processing of operation three and is broken away from workshop section two fully, becomes disconnection near switch four by connection simultaneously;
Then, after pipeline broke away from workshop section two fully and namely all enters workshop section three, pipeline was with speed V
3The time that at the uniform velocity moves ahead is t
20, mobile distance is:
, PLC sends to instruct and makes frequency converter three carry out reduction of speed processing, elapsed time t then
19Movement, speed is zero, pipeline stops then, the distance that this process moves is:
Before pipeline slowed down, pipeline was always with speed V
3At the uniform velocity preceding line time t
20, the distance of operation is
After pipeline stops, going out the pipe unit action, through time t
21After, go out pipe unit pipeline is lifted away from transmission line, wait for t
22, transmission line starts, through time t
17After, the speed of transmission line reaches V
3, and with this speed t that travels at the uniform speed
18 After, accept the pipeline from workshop section two, and by this reciprocation cycle.
The time cycle that can obtain workshop section one, workshop section two, workshop section three according to time cycle of whole transmission line is respectively:
The cycle of described workshop section one is:
Total length by workshop section one is:
Can get:
Therefore can draw, as the length S of production line operation one to the transmission line head end
6After determining, all can process at native system in order to satisfy different length, then the length of the long pipeline that can process of native system satisfies following relation:
Therefore, the one full segment length S of workshop section
1Satisfy following relation:
So as can be known, if process long pipeline, i.e. duct length
The time, the shortest length S1 of workshop section one is:
The cycle of operation of described workshop section two is:
The length of described workshop section two full sections is:
In like manner, should satisfy the variation of production specification, shorten production line again, so the bee-line of workshop section two is:
, wherein L is the length that production line allows the long pipeline of processing; For short duct, then
It is described that to go out pipe unit be t with the time that pipeline is lifted away from workshop section three
21, the 3rd EOS is waited for t
22After, the power wheel of workshop section three starts, through time t
17After, the speed of the power wheel of workshop section three reaches V
3, and with this speed t that travels at the uniform speed
18After, accept the pipeline from workshop section two, and by this reciprocation cycle, wherein
The cycle of described workshop section three is:
,
As shown in figure 13, the total length of described workshop section three is:
, S wherein
14Be the total displacement of pipeline in workshop section three, S
18Be the terminal safety allowance stroke of power wheel.
For satisfying each workshop section pipeline transmission is arranged all, namely at utmost enhance productivity, guarantee simultaneously that every pipeline can not bump to knock into the back, so the cycle between three workshop sections must be satisfied following relation:
For the cycle of workshop section one
, t wherein
1Be to transfer pipeline to the power wheel of workshop section one and stop between the fixing before power wheel starts of reliable back t from the inlet pipe device
2, t
5, t
8Be the acceleration and deceleration time parameter that frequency converter arranges, after system debug finished, these three times were also decided, and are considered as fixed value; t
4, t
7Be that length is that the pipeline of L is with speed V
1, V
2By operation one, two used times of operation, for same batch pipeline, L is definite value, V
1, V
2Be the speed that operation requires, so t
4, t
7Can be considered definite value; For t
3, t
6, can get:
Again because
,
S
7, S
10All can be considered definite value, so for cycle of workshop section one, only need to determine t by PLC according to program and above-mentioned definite value and arithmetic expression
9Get final product, namely PLC is according to above-mentioned time constant, and calculation expression is determined after first pipeline leaves workshop section one, workshop section one power wheel slow down be after zero wait how long, second pipeline transferred by workshop section one.
For the cycle of workshop section two
, t wherein
7, t
14Be that length is that the pipeline of L is with speed V
2, V
3By the used time of operation two, operation three, for same batch pipeline, L is definite value, V respectively
2, V
3Be the speed that operation requires, so t
7, t
14Can be considered definite value; t
10, t
12, t
15Be the acceleration and deceleration time parameter that frequency converter arranges, after system debug finished, these three times were also decided, and are considered as fixed value; t
11Be for guaranteeing the smooth and easy processing by operation two of pipeline, must making workshop section two with speed V
2Stable operation t
11After, the pipeline of workshop section one just enters power wheel, and this time constant can be set according to technological requirement, is considered as fixed value; t
16For workshop section's two power wheels by V
3After deceleration is zero, wait for the power wheel that how long starts workshop section two, this time constant can be set according to technological requirement, is considered as fixed value; For t
13, in conjunction with formula
, can get:
Again because
, S as can be known
13Be considered as definite value, so for cycle of workshop section two, can be considered by PLC and calculate by program, control t
16Size and the time constant that is directly proportional with duct length L; So can get:
This shows, above-mentioned time constant, algebraic expression are enrolled in the PLC program, satisfy following formula, can realize the automatical and efficient rate processing of pipeline of workshop section one, workshop section two.
For the cycle of workshop section three
, t wherein
17, t
19Be the acceleration and deceleration time parameter that frequency converter arranges, after system debug finished, these three times were also decided, and are considered as fixed value; t
18Be for guaranteeing the smooth and easy processing by operation three of pipeline, must making workshop section three with speed V
3Stable operation t
18After, the pipeline of workshop section two just enters workshop section three, and this time constant can be set according to technological requirement, is considered as fixed value; t
14Be that length is that the pipeline of L is with speed V
3By the three used times of operation, for same batch pipeline, L is definite value, V
3Be the speed that operation requires, so t
14Can be considered definite value; t
21For after pipeline stops, going out the pipe unit action, through time t
21After, go out pipe unit pipeline is lifted away from the power wheel of workshop section three, be considered as fixed value; t
22For the workshop section two of workshop section three by V
3After deceleration is zero, wait for the workshop section two that how long starts workshop section three, this time constant can be set according to technological requirement, is considered as fixed value; In conjunction with
, can get:
S wherein
17, S
15Be definite value, so t
20Be definite value; Hence one can see that, and the cycle of workshop section three is to be calculated by program by PLC, control t
22Size and the time constant that is directly proportional with duct length L; So can get:
Described The whole control system also is provided with for spacing (namely being transmitted so far when pipeline near switch five of safety, workshop section three does not normally stop, to send instruction by PLC this moment, this production line all stops by force, avoid taking place security incident), the described end that is installed on transmission line near switch five.
When pipeline touches near switch five, become connection near switch five by disconnection, and connection signal is delivered to PLC, PLC sends instruction at once, stops the work of transmission line; In the time of can breaking down in system near switch five, prevent that pipeline from going out transmission line, and then protection equipment and personal safety.
So total system according to mechanical parameter, electric parameter and relational algebra formula, is adjusted the start-stop time of workshop section one, workshop section two, workshop section three by PLC, and calculate the length L of pipeline automatically; According to the signal that sends near switch, send the acceleration and deceleration instruction to frequency converter, and finally satisfy corresponding time, distance according to technological requirement simultaneously, can realize same production line multitube road, multiple speed, high efficiency automatic transmission.This case only is transmitted as example with three sections, may extend to four sections, five sections ...
The mechanical drive reduction gear ratio of total system is i, and motor is identical (the used motor of supposing the system is the same model of same brand, i.e. power, moment, number of pole-pairs p etc. are all identical) all, does not all have relative slip between power wheel and the pipeline; Therefore: according to the speed of power wheel
With
The output frequency that can get frequency converter one is respectively:
,
Speed according to power wheel
Also can get the output frequency of frequency converter two:
Speed according to power wheel
Can get the output frequency of frequency converter two:
Speed according to power wheel
Also can get the output frequency of frequency converter two:
Below be the note of related letter in the foregoing description:
t
1: workshop section is once time t
1, pipeline is transferred to the transmission line of workshop section one, and stops reliable.
t
2: frequency converter is through acceleration time t
2After, the frequency converter output frequency is f
1, the speed that pipe level moves is V
1, the distance that this moment, pipeline advanced is
t
3: pipeline is with V
1At the uniform velocity move ahead, until touching near switch two, the time of advancing is t
3, distance is:
t
4: pipeline is with speed V
1Through the processing of operation one, the time by this section is t
4, the distance that pipeline moves is:
t
5: pipeline has been finished the processing of first procedure, through time t
5Back speed promotes and is V
2, the frequency converter output frequency is:
, the distance of advancing is:
t
6: pipeline is with V
2Speed travel at the uniform speed to operation two places, prepare the processing of subsequent processing.Elapsed time t
6, the distance of operation is:
t
7: pipeline is with speed V
2By the processing of operation two, elapsed time t
7, the distance of advancing is:
t
8: pipeline breaks away from workshop section one fully, and workshop section slows down at the beginning, elapsed time t
8, the power wheel of workshop section one stops.
t
9: pipeline breaks away from workshop section one fully, and workshop section slows down at the beginning, elapsed time t
8, the power wheel of workshop section one stops.Stand-by period t
9After, PLC sends instruction, and workshop section is the below pipeline at the beginning.
t
10: power wheel is by static startup, through time t
10After the acceleration, the frequency converter output frequency is f
3, the speed of pipeline transmission is
t
11: for guaranteeing the smooth and easy processing by operation two of pipeline, must make power wheel with speed V
2Stable operation t
11(
) after, touch near switch three.
t
12: the frequency of frequency converter is by f
3Promote and be f
4, the speed after the acceleration is V
3, the acceleration time is t
12, the distance of advancing is:
t
13: pipeline is again with V
3Speed at the uniform velocity move on, through time t
13After, enter operation three, to touch near switch four, the distance of advancing around here is:
t
14: pipeline is with V
3Speed move ahead, through time t
14After, pipeline breaks away from workshop section two fully, all enters workshop section three, and the distance of advancing around here is:
t
15: workshop section's two power wheels are by V
3Reduce speed now, through time t
15After, power wheel stops.
t
16: workshop section's two power wheels are by V
3Reduce speed now, through time t
15After, power wheel stops.After this wait for t
16After, the power wheel of startup workshop section two.
t
17: workshop section three, by static startup, through time t
17After the acceleration, the frequency converter output frequency is f
5, when the speed of pipeline transmission
t
18: for guaranteeing the smooth and easy processing by operation three of pipeline, must make workshop section three with speed V
3Stable operation t
18(
) after, touching near switch four, pipeline just begins to enter workshop section three.
t
19: pipeline is with V
3Initial velocity, through time t
19Be kept to zero, and accurately locate, in this process, the distance that pipeline moves ahead is:
t
20: before pipeline slowed down, when pipeline entered workshop section three fully, pipeline was always with speed V
3The time that at the uniform velocity moves ahead is t
20, the distance of operation is
t
21: after pipeline stops, going out the pipe unit action, through time t
21After, go out the power wheel that pipe unit is lifted away from pipeline workshop section three.
t
22: after pipeline stops, going out the pipe unit action, through time t
21After, go out pipe unit pipeline is lifted away from the power wheel of workshop section three, wait for t
22After, transmission line starts.
S
1: the length of workshop section one.
S
2: the length of workshop section two.
S
3: the length of workshop section three.
S
4: frequency converter is through acceleration time t
2After, the frequency converter output frequency is f
1, the speed that pipe level moves is V
1, the distance that this moment, pipeline advanced is
S
5: be S near switch one to transmission line head end distance
5
S
6: operation one full segment length is S
6(namely near the distance of switch two to the transmission line head end).
S
7: pipeline is with V
1At the uniform velocity move ahead, until touching near switch two, the time of advancing is t
3, distance is:
S
8: through the processing of operation one, the time by this section is t to pipeline with speed V1
4, the distance that pipeline moves is:
S
9: pipeline has been finished the processing of first procedure, through time t
5Back speed is V
2, frequency converter one output frequency is:
, the distance of advancing is:
S
10: pipeline is with V
2Speed travel at the uniform speed to operation two places, prepare the processing of subsequent processing.Elapsed time t
6, the distance of operation is:
S
11: pipeline is with speed V
2By the processing of operation two, elapsed time t
7, the distance of advancing is:
S
12: the frequency of frequency converter is by f
3Promote and be f
4, the speed after the acceleration is V
3, the acceleration time is t
12, the distance of advancing is:
S
13: pipeline is again with V
3Speed at the uniform velocity move on, through time t
13After, enter operation three, to touch near switch four, the distance of advancing around here is:
S
14: pipeline is with V
3Speed move ahead, through time t
14After, pipeline breaks away from workshop section two fully, all enters workshop section three, and the distance of advancing around here is:
S
15: pipeline is with V
3Initial velocity, through time t
19Be kept to zero, and accurately locate, in this process, the distance that pipeline moves ahead is:
S
16: the time that pipeline at the uniform velocity moves ahead with speed V3 always is t
20, the distance of operation is
S
17: the center line of inlet pipe device to workshop section's three head ends distance is S
17
S
18: line end safety allowance stroke is S
18
V
1, f
1: the length of establishing pipeline is L, and frequency converter is through acceleration time t
2After, the frequency converter output frequency is f
1, the speed that pipe level moves is V
1, the distance that this moment, pipeline advanced is S
4
V
2, f
2=f
3: pipeline reduces speed now, through time t after finishing the processing of first procedure
5Back speed is V
2, this moment, the frequency converter output frequency was:
, the distance of advancing is:
V
3, f
4=f
5: the frequency upgrading of the frequency converter of workshop section two is f
4, behind reducing gear, the speed after pipeline accelerates is
, the acceleration time is t
12, the distance of advancing is:
T
1: the cycle of operation of workshop section one.
T
2: the cycle of operation of section two.
T
3: the cycle of operation of workshop section three.
L: duct length.
P: motor number of pole-pairs (each workshop section's motor number of pole-pairs of hypothesis is all identical in this case).
I: reducing gear reduction gear ratio (each workshop section's reducing gear reduction gear ratio of hypothesis is all identical in this case).