CN210923483U - Grating driving module for single-channel scanning ICP spectrometer - Google Patents
Grating driving module for single-channel scanning ICP spectrometer Download PDFInfo
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- CN210923483U CN210923483U CN201921663524.3U CN201921663524U CN210923483U CN 210923483 U CN210923483 U CN 210923483U CN 201921663524 U CN201921663524 U CN 201921663524U CN 210923483 U CN210923483 U CN 210923483U
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Abstract
The utility model relates to a grating drive module for single pass scanning ICP spectrometer, including fixed casing and the control unit, set up torque motor in the fixed casing, torque motor on set up flat grating and circle grating, set up the reading head with circle grating complex on the fixed casing, torque motor drive flat grating and circle grating synchronous rotation; the reading head reads the rotation angle of the circular grating and feeds the rotation angle back to the control unit, and the control unit controls the starting and stopping of the torque motor. The original mechanical drive is replaced by the drive of a torque motor, so that the mechanical abrasion is reduced, and the rotation precision is influenced; and the characteristics of torque motor itself can realize quick response and the quick analysis of machine, improves the rotational accuracy of ICP spectrometer, promotes its life.
Description
Technical Field
The utility model belongs to the technical field of the ICP spectrometer manufacturing technique and specifically relates to a grating drive module for single pass scanning ICP spectrometer is related to.
Background
The optical systems of the scanning type ICP emission spectrometer include Ebert-fast and Czerny-Turner, and most of the plane grating scanning type ICP emission spectrometers adopt the Czerny-Turner optical system. According to the principle of the Czerny-Turner optical system, in order to find the analyzed spectral line after the light splitting, the angle of the grating must be accurately changed correspondingly. In order to improve the precision of the rotation of the grating rotating platform, there are two rotation modes of the common grating rotating platform: a screw drive mode and a worm and gear drive mode. Although the positioning accuracy of the two grating driving mechanisms can reach the requirement of the instrument and is not more than 0.001nm, the two grating driving mechanisms belong to the conventional mechanical transmission device, the rotation accuracy is achieved by sacrificing the rotation speed, and the grating driving mechanisms are influenced by mechanical abrasion after long-term use, so that the analysis speed of the instrument is limited, particularly under the condition of excessive analysis elements.
In order to improve the analysis speed of the instrument, a new driving mechanism capable of rapidly rotating the grating needs to be found under the condition of ensuring the rotation positioning precision of the grating, and the influence of mechanical abrasion can be eliminated without adopting a conventional mechanical transmission device.
Disclosure of Invention
The utility model aims to solve the technical problem that a grating drive module for single pass scanning ICP spectrometer that can eliminate mechanical wear and ability quick response is provided.
The utility model provides a technical scheme that its technical problem adopted is: a grating driving module for a single-channel scanning ICP spectrometer comprises a fixed shell and a control unit, wherein a torque motor is arranged in the fixed shell, a plane grating and a circular grating are arranged on the torque motor, a reading head matched with the circular grating is arranged on the fixed shell, and the torque motor drives the plane grating and the circular grating to synchronously rotate; the reading head reads the rotation angle of the circular grating and feeds the rotation angle back to the control unit, and the control unit controls the starting and stopping of the torque motor.
Further specifically, the torque motor is a frameless torque motor, the planar grating and the circular grating are both arranged on a rotor of the frameless torque motor, and a stator of the frameless torque motor is fixed on the fixed shell.
More specifically, the planar grating is fixed on a rotor of the frameless torque motor through a grating fixing table.
Further specifically, the fixed shell comprises a shell body and a flange cover arranged on the top of the shell body, a through hole is formed in the middle of the flange cover, and the grating fixing table penetrates through the through hole and forms a gap with the through hole.
Further specifically, the shell body comprises a large cylinder at the bottom, a small cylinder arranged on the large cylinder and a cavity arranged inside the large cylinder and the small cylinder, the frameless torque motor, the plane grating, the circular grating and the reading head are arranged in the cavity, a step is formed between the large cylinder and the small cylinder, a fixing hole is formed in the step, and the fixing hole is connected to the ICP spectrometer through a bolt.
Further specifically, an annular groove is formed in the cavity, and a stator of the frameless torque motor is clamped in the annular groove.
More specifically, the frameless torque motor has a ring-shaped rotor, a screw thread is formed on the inner side of the rotor, a fixing member is arranged on the screw thread, the grating fixing table is fixed at the top end of the fixing member, and the circular grating is fixed at the bottom end of the fixing member.
A control method based on the grating driving module for the single-channel scanning ICP spectrometer,
s1, inputting an external instruction into the control unit, and analyzing the corresponding instruction by the control unit to obtain the target position of the plane grating;
s2, sending the actual position of the plane grating to a control unit;
s3, planning an optimal path for the torque motor to rotate by the control unit according to the actual position and the target position of the plane grating;
s4, the control unit sends an instruction signal to the torque motor, and the torque motor is started and rotates according to the optimal path;
and S5, when the torque motor rotates to the target position, the control unit controls the torque motor to stop.
More specifically, the planned path in step S3 is two, and the control unit selects the optimal path having the shortest rotation time.
More specifically, in step S5, the reading head reads the rotation position of the circular grating and feeds back the position information to the control unit, and the control unit determines whether the position information is the target position, controls the torque motor to stop moving if the position information is the target position, and does not operate if the position information is not the target position.
The utility model has the advantages that: the original mechanical drive is replaced by the drive of the torque motor in the scheme, so that the mechanical abrasion is reduced, and the rotation precision is influenced; the torque motor has the characteristics of high torque inertia ratio provided by quick start/stop and high acceleration, high low-speed running precision, no backlash error caused by a speed reduction system and the like, can realize quick response and quick analysis of the machine, improves the rotation precision of the ICP spectrometer, and prolongs the service life of the ICP spectrometer.
Drawings
FIG. 1 is a schematic sectional view of the present invention;
fig. 2 is a step diagram of the control method of the present invention.
In the figure: 1. a stationary housing; 2. a torque motor; 3. a circular grating; 4. a reading head; 5. a grating fixing table; 6. a fixing member; 7. a bearing; 11. a housing body; 12. a flange cover; 21. a stator; 22. a rotor; 111. a large cylinder; 112. a small cylinder.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, a grating driving module for a single-channel scanning ICP spectrometer includes a fixed housing 1 and a control unit (not shown) integrated in the ICP spectrometer, the control unit is a part of a control system of the ICP spectrometer, a torque motor 2 is disposed in the fixed housing 1, a plane grating and a circular grating 3 are disposed on the torque motor 2, a reading head 4 matched with the circular grating 3 is disposed on the fixed housing 1, and the torque motor 2 drives the plane grating and the circular grating 3 to rotate synchronously; the reading head 4 reads the rotation angle of the circular grating 3 and feeds back the rotation angle to the control unit, and the control unit controls the starting and stopping of the torque motor 2.
Based on the above structure, when driving the plane grating to rotate, the control unit is implemented by controlling the torque motor 2, as shown in fig. 2, the control steps are as follows:
s1, inputting an external instruction into the control unit, and analyzing the corresponding instruction by the control unit to obtain the target position of the plane grating; the external instruction input can be performed through a keyboard, a mouse and a touch screen, and according to the input external instruction, the control unit analyzes through embedded software to obtain the final position of the plane grating, namely the target position.
S2, when the target position is determined, the plane grating sends the actual position to the control unit, the determination of the actual position can be achieved through two modes, the first mode is that the angle of the torque motor 2 rotating relatively is judged, the specific value of the torque motor 2 rotating each time needs to be stored in the control unit, and the relative position is obtained through calculation; the second type is through reading head 4 and circular grating 3 cooperation, and reading head 4 directly reads circular grating 3's specific position and feeds back to the control unit, and reading head 4 can read the position in real time, also can arouse through the control unit and read circular grating 3 relative position.
S3, the control unit plans an optimal path for the torque motor 2 to rotate according to the actual position and the target position of the plane grating; the torque motor 2 rotates by two paths, clockwise rotation and anticlockwise rotation are achieved, the control unit calculates specific time of rotation of the two paths, two path selection modes are achieved according to the calculated specific time, the minimum time from starting to stopping of the torque motor 2 is determined, the first mode selects the path with the minimum time from the specific time of the two paths as an optimal path when the specific time calculated by the two paths is larger than the minimum time from starting to stopping of the torque motor 2, and the control unit judges that the two paths are both the optimal path and randomly selects one path to implement when the time spent by the two paths is the same; secondly, when the specific time calculated by one of the two paths is less than the minimum time taken for the torque motor 2 to start and stop, the control unit selects the path which takes the most time as the optimal path.
S4, after the optimal path is selected, the control unit sends an instruction signal to the torque motor 2, and the torque motor 2 is started and rotates according to the optimal path;
s5, when the torque motor 2 rotates to the target position, the control unit controls the torque motor 2 to stop; according to the two ways of controlling the torque motor 2 in the step S2, there are two corresponding ways of stopping the rotation of the torque motor 2, and the first control unit stores the rotation angle of the torque motor 2 for control; the second reading head 4 reads the rotation position of the circular grating 3 and feeds back the position information to the control unit, the control unit judges whether the position information is a target position, if the position information is the target position, the control unit controls the torque motor 2 to stop moving, and if the position information is not the target position, the control unit does not act.
Further, the torque motor 2 adopts a frameless torque motor, which can provide more equipment space, so that the utilization of the internal space of the equipment is facilitated, the plane grating and the circular grating 3 are fixed on a rotor 22 of the frameless torque motor, and a stator 21 of the frameless torque motor is fixed on the fixed shell 1; meanwhile, in order to facilitate the fixing of the frameless torque motor stator 21 and the output of the frameless torque motor stator, the fixed housing 1 comprises a housing body 11 and a flange cover 12 arranged on the top of the housing body 11, a through hole is formed in the middle of the flange cover 12, the grating fixing table 5 penetrates through the through hole and forms a gap with the through hole, and the rotor drives the grating fixing table 5 to rotate without colliding with the gap, so that the rotation is smooth; on this basis, the shell body 11 comprises a large cylinder 111 at the bottom, a small cylinder 112 arranged on the large cylinder 111 and a cavity arranged inside the large cylinder 111 and the small cylinder 112, the frameless torque motor 2, the plane grating, the circular grating 3 and the reading head 4 are arranged in the cavity, a hole for a cable to pass through is formed in the shell body 11 and used for supplying power to the stator 21 of the frameless torque motor and outputting position information of the circular grating 3 detected by the reading head 4 to the control unit, a step is formed between the large cylinder 111 and the small cylinder 112, a fixing hole is formed in the step, and the fixing hole is connected to the ICP spectrometer through a bolt so as to be convenient to fix.
Further, in order to clamp the frameless torque motor 2 in the cavity, an annular groove is formed in the cavity, the stator 21 of the frameless torque motor is clamped in the annular groove, and the through hole of the flange cover 12 is smaller than the top of the cavity, so that the rotor 22 can be limited from running out of the cavity. The frameless torque motor rotor 22 is annular, a thread is formed on the inner side of the rotor 22, a fixing piece 6 is arranged on the thread, the grating fixing table 5 is fixed at the top end of the fixing piece 6, the circular grating 3 is fixed at the bottom end of the fixing piece 6, and the fixing piece 6 and the shell body 11 are supported through a bearing 7 and are ensured to rotate stably.
In conclusion, the original mechanical structure is replaced by the arrangement of the structure, and the mechanical friction is reduced by adopting the torque motor 2, so that the rotation precision is improved, and the service life is prolonged; on the basis of the structure, the optimal path is selected through the automatic control realized by the system and the embedded software, so that the rapid movement to the target position is realized, the time spent on rotating is reduced, and the efficiency is improved on the basis of stable operation of the equipment.
It is to be emphasized that: the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form, and any simple modifications, equivalent changes and modifications made by the technical spirit of the present invention to the above embodiments are all within the scope of the technical solution of the present invention.
Claims (7)
1. A grating driving module for a single-channel scanning ICP spectrometer comprises a fixed shell (1) and a control unit, and is characterized in that a torque motor (2) is arranged in the fixed shell (1), a plane grating and a circular grating (3) are arranged on the torque motor (2), a reading head (4) matched with the circular grating (3) is arranged on the fixed shell (1), and the plane grating and the circular grating (3) are driven by the torque motor (2) to rotate synchronously; the reading head (4) reads the rotating angle of the circular grating (3) and feeds the rotating angle back to the control unit, and the control unit controls the starting and stopping of the torque motor (2).
2. The grating driving module for the single-channel scanning ICP spectrometer of claim 1, wherein the torque motor (2) is a frameless torque motor, the planar grating and the circular grating (3) are both disposed on a rotor (22) of the frameless torque motor, and a stator (21) of the frameless torque motor is fixed on the fixed housing (1).
3. The grating driving module for a single-pass scanning ICP spectrometer of claim 2, wherein the planar grating is fixed to a rotor (22) of a frameless torque motor by a grating fixing stage (5).
4. The grating driving module for the single-channel scanning ICP spectrometer according to claim 3, wherein the fixed housing (1) comprises a housing body (11) and a flange cover (12) arranged on the top of the housing body (11), a through hole is formed in the middle of the flange cover (12), and the grating fixing table (5) penetrates through the through hole and forms a gap with the through hole.
5. The grating driving module for the single-channel scanning ICP spectrometer according to claim 4, wherein the housing body (11) comprises a large cylinder (111) at the bottom, a small cylinder (112) arranged on the large cylinder (111), and a cavity arranged inside the large cylinder (111) and the small cylinder (112), the frameless torque motor, the plane grating, the circular grating (3), and the reading head (4) are arranged in the cavity, a step is formed between the large cylinder (111) and the small cylinder (112), a fixing hole is arranged on the step, and the fixing hole is connected to the ICP spectrometer through a bolt.
6. The grating drive module for a single-pass scanning ICP spectrometer of claim 5, wherein an annular groove is disposed in the cavity, and a stator (21) of the frameless torque motor is clamped in the annular groove.
7. The grating driving module for a single-pass scanning ICP spectrometer according to claim 3, wherein the rotor (22) of the frameless torque motor is annular, a thread is started on the inner side of the rotor (22), a fixing piece (6) is arranged on the thread, the grating fixing table (5) is fixed at the top end of the fixing piece (6), and the circular grating (3) is fixed at the bottom end of the fixing piece (6).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921663524.3U CN210923483U (en) | 2019-09-30 | 2019-09-30 | Grating driving module for single-channel scanning ICP spectrometer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921663524.3U CN210923483U (en) | 2019-09-30 | 2019-09-30 | Grating driving module for single-channel scanning ICP spectrometer |
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| CN210923483U true CN210923483U (en) | 2020-07-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110501328A (en) * | 2019-09-30 | 2019-11-26 | 江苏天瑞仪器股份有限公司 | Grating drive module and control method for single-channel scanning ICP spectrometer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110501328A (en) * | 2019-09-30 | 2019-11-26 | 江苏天瑞仪器股份有限公司 | Grating drive module and control method for single-channel scanning ICP spectrometer |
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