CN201795997U - Spiral CT synchronous control system for safety inspection - Google Patents
Spiral CT synchronous control system for safety inspection Download PDFInfo
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- CN201795997U CN201795997U CN2010205251747U CN201020525174U CN201795997U CN 201795997 U CN201795997 U CN 201795997U CN 2010205251747 U CN2010205251747 U CN 2010205251747U CN 201020525174 U CN201020525174 U CN 201020525174U CN 201795997 U CN201795997 U CN 201795997U
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Abstract
The utility model discloses a control system which is specially designed for a spiral computed tomography (CT) synchronous control method for safety inspection. The system comprises a rotary mechanism and a horizontal mechanism, wherein the horizontal mechanism comprises a conveying belt and a transmission gear and is connected with an alternating current servo motor; the alternating current servo motor is controlled by a servo driver; the rotary mechanism is provided with an encoder; the encoder transmits pulse corresponding to one round of rotation of the rotary mechanism to the servo driver; and the servo driver controls the movement of the horizontal mechanism and the rotation of the rotary mechanism to be kept synchronous by the servo motor. The system does not need a control circuit, is easy to implement and has a small constraint factor and high accuracy.
Description
Technical field
The utility model relates to a kind of CT synchronous control system, and specifically a kind of safety inspection spiral CT synchronous control system belongs to safety-security area.
Background technology
The CT technology is in medical treatment and industrial circle widespread use, and in the safety inspection field, the CT technology is the necessary means of explosive detection, is the inexorable trend of this field development.And synchro control promptly directly influences the quality of picture quality to the quality of two coordinates of motion axle controls.Existing C T synchro control implementation is generally in the following way: homogeneity Rolling motor is preferably adopted in the X-axis tangential movement, the Y-axis employing AC servo motor that rotatablely moves, by the magnetic grid position probing, regulate the rotating speed of rotating mechanism according to the speed that records and selected pitch, as shown in Figure 1.Aforesaid way guarantees translation motion and the homogeneity and the positional precision that rotatablely move, makes pitch extremely approach a constant and realizes that kinematic axis is synchronous.The kinematic accuracy of this mode translating sections is limited by homogeneity and the hardware technological level of selecting Rolling motor for use, and because the specific (special) requirements in safety check field, the weight of object to be detected and the time of putting travelling belt are unfixed, thereby the error of horizontal direction is inevitable, and the precision of Spin Control depends on the precision of magnetic grid, the control system rate accuracy, servo-controlled precision.Thereby realize complexity, and restraining factors are many, and the error that each link exists all can influence final imaging effect.Cost increases.
The movement locus of the some correspondence point on tested object on the horizontal transmission bands in the spiral scan mode on the rotary frame promptly is called helix.The intercept of helix is called pitch.A definition of pitch is: the distance that object to be detected moves in frame rotates a circle the time goes out the beam width ratio with ray.Be formulated as:
H=d/s=vt/s (formula 1)
H represents pitch in the formula, the d distance that detected material moves of representing to rotate a circle.V represents the speed that detected material moves, and s represents that ray goes out beam width.According to the requirement of image reconstruction, it is constant in scanning process pitch to be remained.If pitch changes, the distance of promptly revolving the detected material translation of turning around is long or too short, and every layer thickness of reconstructed image is just inconsistent, causes producing bigger pseudomorphism.
Summary of the invention
The utility model purpose is to overcome the deficiency of above-mentioned prior art and a kind of safety inspection spiral CT synchronous control system is provided, by tangential movement is reached the synchronous effect of coordinate motion axle by linkage manner with rotatablely moving, guarantee that pitch is fixed value, guarantee the quality of image.
Realize that the technical scheme that the utility model purpose adopts is:
A kind of is the custom-designed control system of safety inspection usefulness spiral CT synchronisation control means, this system comprises rotating mechanism and horizontal mechanism, comprise rotating mechanism and horizontal mechanism, horizontal mechanism comprises travelling belt and transmission gear, described horizontal mechanism is connected with AC servo motor, and AC servo motor is controlled by servo-driver; Described rotating mechanism is equipped with scrambler, and scrambler rotates a circle corresponding burst transmissions to servo-driver with rotating mechanism, and servo-driver keeps synchronously by the rotation of servomotor controlling level mechanism kinematic and rotating mechanism.
Further, described servomotor is equipped with the servomotor scrambler, and the output of servomotor scrambler feeds back to servo-driver, realizes closed-loop control.
Further, described rotating mechanism drives the big disk rotation by steamboat, and scrambler is installed on the big disk, and the scrambler output terminal is connected to the pulse input port of motor servo driver.
Further, described stream motor is equipped with the alternating current generator scrambler, and encoder feedback realizes that to frequency converter PG mouth closed-loop vector control alternating current generator keeps stable rotating speed.
The utility model is simpler than existing techniques in realizing, and peripheral hardware is few, need not to increase control circuit, realize simply, be subjected to restraining factors little, with tangential movement with rotatablely move and do as a whole consideration rather than split into two parts, consider two parts homogeneity separately respectively, realize that deviation is little, the precision height.The utility model reaches coordinate motion axle synchronous effect by linkage manner with translation motion with rotatablely moving, control the servomotor rotating speed to reach the purpose that pitch is constantly equal to constant by the scrambler that is installed in rotating mechanism, have and realize succinctly, precision height, the advantage that cost reduces.
Description of drawings
Fig. 1 is existing CT coordinates of motion axle synchro control structured flowchart commonly used.
Fig. 2 is the utility model structured flowchart.
Embodiment
For technological means, creation characteristic that the utility model is realized, reach purpose and effect is easy to understand, below in conjunction with accompanying drawing the utility model is further elaborated.
As shown in Figure 2, a kind of safety inspection spiral CT synchronous control system comprises rotating mechanism and horizontal mechanism, and horizontal mechanism comprises travelling belt and transmission gear, and horizontal mechanism is connected with AC servo motor, and AC servo motor is controlled by servo-driver; Described rotating mechanism is connected with alternating current generator, and alternating current generator passes through Frequency Converter Control.Alternating current generator is equipped with scrambler 1, and scrambler 1 feeds back to frequency converter PG mouth, keeps stable rotating speed by closed-loop vector control alternating current generator.Rotating mechanism drives the big disk rotation by steamboat, scrambler 2 is installed on the big disk, scrambler 2 output terminals are connected to the pulse input port of motor servo driver, scrambler 2 is given servo-driver with the rotating mechanism corresponding burst transmissions that rotates a circle, and rotating mechanism is equipped with the rotation of scrambler servo-driver by servomotor controlling level mechanism kinematic and rotating mechanism and keeps consistency.Servomotor is equipped with scrambler, and the output of servomotor scrambler is fed back to servo-driver, realizes closed-loop control.
In the utility model implementation procedure, rotating mechanism is a masters, and the passive rotating mechanism rotating speed that is subjected to of horizontal mechanism is controlled.Form whole system by two coordinates of motion axles, need not to increase other controllers and control computer, be called interlock.
Scrambler 2 is installed on big disk in the present embodiment, is now selected for use 2000 pulse encoders, revolve and turn around, 2000 pulses of scrambler output.The A of scrambler 1, the output of B item is connected to the pulse input port of motor servo driver.
Motor servo driver is set at position control mode, receives external encoder 2 inputs, controls the servomotor movement velocity by external encoder 2 input pulses.
Set 2000 pulses of external encoder 2 outputs, motor advance each pulse motor forward travel distance of 0.1m. be 0.05mm. promptly the unit of instruction to be 0.05m servomotor mechanical part realize with the mode of belt+belt pulley, the belt pulley girth is L, reduction gear ratio is P, and servomotor scrambler figure place is 13.Set servomotor electronics gear ratio:
(formula 2)
The servomotor control model is set at internal speed/position control mode.Can be when rotary encoder 2 no-outputs by the operation of servo-driver inner setting speed.
After setting finishes, the servomotor scrambler is connected to servo-driver the corresponding interface finishes the servomotor closed-loop control.
The utility model guarantees that it is fixed value that servomotor whenever receives the distance that a circle pulse signal advances, and makes the displacement of tangential movement be stabilized in calculated value by servo closed-loop control again.Realize that by described mode pitch is constantly equal to the target of constant.S is that ray goes out beam width in the formula 1, is constant.If need h to equal constant, then needing D is constant.The rotating mechanism scrambler whenever revolves the output umber of pulse that turns around to be fixed.Be made as N, N pulse realizes that by setting the electronics gear ratio every N pulse forward travel distance is that D. is each pulse, and forward travel distance is fixed, and when pulse duty factor was big, servomotor speed was followed reduction, pulse duty factor hour, the lifting of servomotor speed.The final synchro control that realizes rotating mechanism and horizontal mechanism.
Claims (4)
1. safety inspection spiral CT synchronous control system, it is characterized in that: comprise rotating mechanism and horizontal mechanism, horizontal mechanism comprises travelling belt and transmission gear, and described horizontal mechanism is connected with AC servo motor, and AC servo motor is controlled by servo-driver; Described rotating mechanism is equipped with scrambler, and scrambler rotates a circle corresponding burst transmissions to servo-driver with rotating mechanism, and servo-driver keeps synchronously by the rotation of servomotor controlling level mechanism kinematic and rotating mechanism.
2. according to the described safety inspection of claim 1 spiral CT synchronous control system, it is characterized in that: servomotor is equipped with the servomotor scrambler, and the output of servomotor scrambler feeds back to servo-driver, realizes closed-loop control.
3. according to the described safety inspection of claim 2 spiral CT synchronous control system, it is characterized in that: rotating mechanism drives the big disk rotation by steamboat, and scrambler is installed on the big disk, and the scrambler output terminal is connected to the pulse input port of motor servo driver.
4. safety inspection spiral CT synchronous control system according to claim 1, it is characterized in that: alternating current generator is equipped with the alternating current generator scrambler, and encoder feedback realizes that to frequency converter PG mouth closed-loop vector control alternating current generator keeps stable rotating speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205251747U CN201795997U (en) | 2010-09-12 | 2010-09-12 | Spiral CT synchronous control system for safety inspection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205251747U CN201795997U (en) | 2010-09-12 | 2010-09-12 | Spiral CT synchronous control system for safety inspection |
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| Publication Number | Publication Date |
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| CN201795997U true CN201795997U (en) | 2011-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010205251747U Expired - Lifetime CN201795997U (en) | 2010-09-12 | 2010-09-12 | Spiral CT synchronous control system for safety inspection |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101917160A (en) * | 2010-09-12 | 2010-12-15 | 上海英迈吉东影图像设备有限公司 | Spiral CT (Computed Tomography) synchronization control method and system for safety inspection |
| CN106880374A (en) * | 2017-03-27 | 2017-06-23 | 东北大学 | Power spectrum CT imaging methods and power spectrum CT imaging systems |
| CN112710683A (en) * | 2020-12-17 | 2021-04-27 | 北京航星机器制造有限公司 | CT detection device and detection method |
| CN112710679A (en) * | 2020-12-17 | 2021-04-27 | 北京航星机器制造有限公司 | DR detection device and detection method |
-
2010
- 2010-09-12 CN CN2010205251747U patent/CN201795997U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101917160A (en) * | 2010-09-12 | 2010-12-15 | 上海英迈吉东影图像设备有限公司 | Spiral CT (Computed Tomography) synchronization control method and system for safety inspection |
| CN106880374A (en) * | 2017-03-27 | 2017-06-23 | 东北大学 | Power spectrum CT imaging methods and power spectrum CT imaging systems |
| CN112710683A (en) * | 2020-12-17 | 2021-04-27 | 北京航星机器制造有限公司 | CT detection device and detection method |
| CN112710679A (en) * | 2020-12-17 | 2021-04-27 | 北京航星机器制造有限公司 | DR detection device and detection method |
| CN112710679B (en) * | 2020-12-17 | 2023-01-10 | 北京航星机器制造有限公司 | DR detection device and detection method |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110413 |
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| CX01 | Expiry of patent term |