CN107036643B - Automatic zero setting device for low-frequency mechanical spectrum tester - Google Patents
Automatic zero setting device for low-frequency mechanical spectrum tester Download PDFInfo
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- CN107036643B CN107036643B CN201710449651.2A CN201710449651A CN107036643B CN 107036643 B CN107036643 B CN 107036643B CN 201710449651 A CN201710449651 A CN 201710449651A CN 107036643 B CN107036643 B CN 107036643B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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Abstract
The invention relates to an automatic zero setting device for a low-frequency mechanical spectrum tester, which comprises a base, a rack arranged on the base, a photoelectric converter arranged on the rack and capable of horizontally sliding, a synchronous belt transmission mechanism arranged on the base and driving the photoelectric converter to slide through the driving of a stepping motor, and a zero setting circuit used for acquiring signals of the photoelectric converter to control the action of the stepping motor; the zero setting circuit comprises two groups of silicon photocells which are arranged on the photoelectric converter and are in differential connection, and a stepping motor subdivision driver which is in line connection with a stepping motor; one group of silicon photocells is connected with the instrument amplifier and then connected to the upper computer, and the other group of silicon photocells is connected with the subtracter and then respectively connected to the zero-crossing comparator and the bipolar V/F converter and then connected to the stepping motor subdivision driver; the invention collects the light spot vibration signal through one group of silicon photocell group, and the other group of silicon photocell group is used for the quick zero adjustment of the photoelectric converter, and has the functions of self-locking and fine adjustment.
Description
Technical Field
The invention relates to the field of low-frequency mechanical spectrum testing, in particular to an automatic zero setting device for a low-frequency mechanical spectrum tester.
Background
The low-frequency mechanical spectrum tester is an important instrument for researching the characteristics of material force, electricity, magnetism and the like, can detect the internal structure, defects and dislocation of materials and research the motion rule of crystal boundaries or phase interfaces.
At present, the low-frequency mechanical spectrum tester used in China is generally self-developed, for example, the LMA-1 type low-frequency mechanical spectrum tester developed in 2004 by the modern testing technology research institute of the professional university in Suzhou; the tester converts the vibration of a sample into the displacement of parallel light spots by utilizing a plane mirror on a vertical swing rod, converts the displacement of the light spots into voltage signals through two silicon photocells which are in differential connection on a photoelectric converter, and acquires data by an upper computer, thereby measuring the mechanical spectrum of the sample; however, in the test process, the light spot is easy to deviate from the zero position, so that when the light spot vibrates along with the sample, the light cannot be irradiated by one of the silicon photocells, and the test fails; the existing solution is to drive the screw nut transmission mechanism to control the position of the photoelectric converter through the upper computer, and continuously adjust the position of the photoelectric converter to return to a zero position.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an automatic zero setting device for a low-frequency mechanical spectrum tester, which can quickly zero a photoelectric converter without the control of an upper computer and has the functions of self-locking and fine adjustment.
In order to achieve the purpose, the invention adopts the technical scheme that: an automatic zero-setting device for a low-frequency mechanical spectrum tester comprises a base, a rack arranged on the base, a photoelectric converter arranged on the rack and capable of horizontally sliding, a synchronous belt transmission mechanism arranged on the base and driving the photoelectric converter to slide through the driving of a stepping motor, and a zero-setting circuit for acquiring signals of the photoelectric converter to control the movement of the stepping motor; the zero setting circuit comprises two groups of silicon photocells which are arranged on the photoelectric converter and are in differential connection, an amplifier for an instrument, a subtracter, a zero crossing comparator, a bipolar V/F converter and a stepping motor subdivision driver which is connected with a stepping motor line; one group of silicon photocells is connected with an amplifier for an instrument and then connected to an upper computer and used for collecting light spot vibration signals, the light spot vibration signals are amplified by the amplifier for the instrument and then transmitted to the upper computer, the other group of silicon photocells is connected with a subtracter and then divided into two paths and used for quickly zeroing a photoelectric converter, one path of silicon photocells is connected to a zero crossing comparator and then connected to a stepping motor subdivision driver and used for controlling the steering of a stepping motor, and the other path of silicon photocells is connected to a bipolar V/F converter and then connected to the stepping motor subdivision driver and used for controlling the rotating speed of the stepping motor.
Preferably, the zero setting circuit further comprises a rectifier bridge, a comparator and an electronic switch a; the output end of the subtracter is divided into two paths, wherein one path is connected with the electronic switch A and then respectively connected with the zero-crossing comparator and the bipolar V/F converter, and the other path is sequentially connected with the rectifier bridge and the comparator and then connected to the electronic switch A for feeding back signals and judging the on-off of the circuit according to the voltage difference; the input end of the comparator is also connected with a reference voltage.
Preferably, the zero setting circuit further comprises an electronic switch B and an electronic switch C; and the electronic switch B and the electronic switch C are controlled by an upper computer, wherein the electronic switch B is connected between the zero-crossing comparator and the stepping motor subdivision driver, and the electronic switch C is connected between the bipolar V/F converter and the stepping motor subdivision driver.
Preferably, the rack comprises two brackets vertically arranged at two ends of the base and two horizontally arranged guide rails; two ends of each guide rail are arranged on the two brackets in a vertically sliding manner through sliding blocks; the photoelectric converter is arranged on the two guide rails in a sliding manner.
Preferably, the synchronous belt transmission mechanism comprises a synchronous driving gear and a synchronous driven gear which are respectively arranged on the base, and a synchronous belt which bypasses the synchronous driving gear and the synchronous driven gear to drive the photoelectric converter to slide; the stepping motor is connected with the synchronous driving gear through a coupler.
Preferably, the photoelectric converter and the synchronous belt are connected or bonded through a screw or a buckle.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
the automatic zero setting device for the low-frequency mechanical spectrum tester collects light spot vibration signals through one group of silicon photocell group and transmits the light spot vibration signals to the upper computer, the other group of silicon photocell group is used for collecting light spot positions, the steering of the stepping motor is controlled through the zero-crossing comparator, the revolution of the stepping motor is controlled through the bipolar V/F converter, the photoelectric converter can be driven to be quickly set to zero, and the adjusting time is greatly saved; the stepping motor is controlled by the stepping motor subdivision driver, so that the stepping motor can run at a smaller stepping distance angle, and the zero setting of the photoelectric converter is more accurate and the running is more stable; and the stepping motor has a self-locking function, can effectively lock the position of the photoelectric converter and prevent the photoelectric converter from deviating in the measuring process.
Drawings
The technical scheme of the invention is further explained by combining the accompanying drawings as follows:
FIG. 1 is a schematic structural diagram of an automatic zero setting device for a low-frequency mechanical spectrum tester according to the present invention;
fig. 2 is a circuit diagram of a zero setting circuit in the automatic zero setting device for the low frequency mechanical spectrum tester according to the present invention.
Wherein: 1. a base; 2. a synchronous driving gear; 3. a silicon photovoltaic cell; 4. a photoelectric converter; 5. a guide rail; 6. a slider; 7. a support; 8. a synchronous driven gear; 9. a synchronous belt; 10. a stepping motor; 11. an instrumentation amplifier; 12. an upper computer; 13. a subtractor; 14. an electronic switch A; 15. a zero-crossing comparator; 16. an electronic switch B; 17. a stepper motor subdivision driver; 18. a rectifier bridge; 19. a reference voltage; 20. a comparator; 21. a bipolar V/F converter; 22. and an electronic switch C.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
Fig. 1-2 show an automatic zero setting device for a low frequency mechanical spectrum tester, which comprises a base 1, a frame arranged on the base 1, a photoelectric converter 4 arranged on the frame and capable of horizontally sliding, a synchronous belt transmission mechanism arranged on the base 1 and driven by a stepping motor 10 to drive the photoelectric converter 4 to slide, and a zero setting circuit for acquiring signals of the photoelectric converter 4 to control the stepping motor 10 to move; the zero setting circuit comprises two groups of silicon photocells 3 arranged on the photoelectric converter 4, an instrument amplifier 11, a subtracter 13, a zero crossing comparator 15, a bipolar V/F converter 21, a rectifier bridge 18, a comparator 20, an electronic switch A14, an electronic switch B16, an electronic switch C22 and a stepping motor subdivision driver 17 connected with a stepping motor 10 through a line; one group of silicon photocells 3 comprises a silicon photocell A and a silicon photocell B which are in differential connection, are connected with an instrument amplifier 11 and then are connected to an upper computer 12 and are used for collecting light spot vibration signals, the light spot vibration signals are transmitted to the upper computer 12 after being amplified by the instrument amplifier 11, the other group of silicon photocells 3 comprises a silicon photocell C and a silicon photocell D which are in differential connection, are divided into two paths after being connected with a subtracter 13 and are used for quick zero setting of a photoelectric converter 4, one path is connected to a DIR input end of a stepping motor subdivision driver 17 after being connected to a zero-crossing comparator 15 and is used for controlling the steering of a stepping motor 10, and the other path is connected to a CP end of the stepping motor subdivision driver 17 after being connected to a bipolar V/F converter 21 and is used for controlling the rotating speed of the stepping motor 10; the output end of the subtracter 13 is divided into two paths, wherein one path is connected with the electronic switch A14 and then respectively connected with the zero-crossing comparator 15 and the bipolar V/F converter 21, and the other path is sequentially connected with the rectifier bridge 18 and the comparator 20 and then connected to the electronic switch A14 for feeding back signals and judging the on-off of the circuit according to the voltage difference; the input end of the comparator 20 is also connected with a reference voltage 19; the electronic switch B16 and the electronic switch C22 are controlled by the upper computer 12, wherein the electronic switch B16 is connected between the zero-crossing comparator 15 and the stepping motor subdivision driver 17, and the electronic switch C22 is connected between the bipolar V/F converter 21 and the stepping motor subdivision driver 17, so that the upper computer 12 can control the stepping motor 10 to act conveniently; the frame comprises two brackets 7 vertically arranged at two ends of the base 1 and two guide rails 5 horizontally arranged; two ends of each guide rail 5 can be arranged on the two brackets 7 in a vertically sliding manner through the sliding blocks 6; the photoelectric converter 4 is arranged on the two guide rails 5 in a sliding manner; the synchronous belt transmission mechanism comprises a synchronous driving gear 2 and a synchronous driven gear 8 which are respectively arranged on the base 1, and a synchronous belt 9 which bypasses the synchronous driving gear 2 and the synchronous driven gear 8 and drives the photoelectric converter 4 to slide; the stepping motor is connected with the synchronous driving gear 2 through a coupler; the photoelectric converter 4 and the synchronous belt 9 are connected or bonded through screws or buckles.
When in use: when the low-frequency mechanical spectrum tester is used for testing the mechanical spectrum, firstly, the reference voltage 19 is adjusted according to different testing materials; after the primary test is finished, the upper computer 12 performs brake control on the vertical swing rod, and after the brake is finished, the upper computer 12 sends a control signal to the quick automatic zero setting device to close the electronic switch B16 and the electronic switch C22; at this time, if the spot position deviates from the zero position, the light irradiation areas of the silicon photocell C and the silicon photocell D are different, the silicon photocell C and the silicon photocell D output differential voltages, the subtraction operation and the amplification are performed by the subtractor 13, the differential voltages are converted into unipolar positive voltages by the rectifier bridge 18, and then the unipolar positive voltages are compared with the reference voltage 19 by the comparator 20; when the light spot is smaller than the reference voltage 19 and deviates within a normal range, the photoelectric converter 4 does not need to perform position adjustment, the output of the comparator 20 is 0, the electronic switch a14 is not closed, otherwise, when the light spot is larger than the reference voltage 19, the output of the comparator 20 is logic 1, the electronic switch a14 is closed and divided into two paths, one path is connected with the zero comparator 15 to generate a rotation direction control signal of the stepping motor, and the stepping motor drives the synchronous belt 9 to drive the photoelectric converter 4 to rotate towards the direction of reducing the voltage difference between the silicon photocell C and the silicon photocell D; the other route of the bipolar V/F converter 21 generates a stepping motor driving pulse, when the voltage difference between the silicon photocell C and the silicon photocell D is larger, the frequency of the pulse is higher, the rotating speed of the stepping motor is faster, the movement of the photoelectric converter 4 is faster, and the voltage difference between the silicon photocell C and the silicon photocell D can be rapidly reduced; on the contrary, when the voltage difference between the silicon photocell C and the silicon photocell D is small, the pulse frequency is low, the position of the photoelectric converter 4 can be finely adjusted, excessive zero adjustment is effectively avoided, the steps are sequentially circulated until the differential voltage output by the silicon photocell C and the silicon photocell D is smaller than the reference voltage 19, the feedback signal informs the upper computer 12 of the completion of zero adjustment, and the next mechanical spectrum test can be performed.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
the automatic zero-setting device for the low-frequency mechanical spectrum tester collects light spot vibration signals through one group of silicon photocells and transmits the light spot vibration signals to the upper computer, the other group of silicon photocells is used for collecting light spot positions, the steering of the stepping motor is controlled through the zero-crossing comparator, the revolution number of the stepping motor is controlled through the bipolar V/F converter, the photoelectric converter can be driven to be quickly set to zero, and the adjusting time is greatly saved; the stepping motor is controlled by the stepping motor subdivision driver, so that the stepping motor can run at a smaller stepping distance angle, and the zero setting of the photoelectric converter is more accurate and the running is more stable; and the stepping motor has a self-locking function, can effectively lock the position of the photoelectric converter and prevent the photoelectric converter from deviating in the measuring process.
The above is only a specific application example of the present invention, and the protection scope of the present invention is not limited in any way. All the technical solutions formed by equivalent transformation or equivalent replacement fall within the protection scope of the present invention.
Claims (5)
1. The utility model provides an automatic zero-setting device for low frequency mechanics spectrum tester which characterized in that: the device comprises a base, a frame arranged on the base, a photoelectric converter arranged on the frame and capable of horizontally sliding, a synchronous belt transmission mechanism arranged on the base and driven by a stepping motor to drive the photoelectric converter to slide, and a zero setting circuit used for acquiring signals of the photoelectric converter to control the stepping motor to act; the zero setting circuit comprises two groups of silicon photocells which are arranged on the photoelectric converter and are in differential connection, an amplifier for the instrument, a subtracter, a zero crossing comparator, a bipolar V/F converter, a rectifier bridge, a comparator, an electronic switch A and a stepping motor subdivision driver which is connected with a stepping motor line; one group of silicon photocells is connected with an amplifier for instruments and then connected to an upper computer and used for collecting light spot vibration signals, the light spot vibration signals are amplified by the amplifier for instruments and then transmitted to the upper computer, the other group of silicon photocells is connected with a subtracter and then divided into two paths and used for quickly zeroing a photoelectric converter, one path of silicon photocells is connected to a zero crossing comparator and then connected to a stepping motor subdivision driver and used for controlling the steering of a stepping motor, and the other path of silicon photocells is connected to a bipolar V/F converter and then connected to the stepping motor subdivision driver and used for controlling the rotating speed of the stepping motor; the output end of the subtracter is divided into two paths, wherein one path is connected with the electronic switch A and then respectively connected with the zero-crossing comparator and the bipolar V/F converter, and the other path is sequentially connected with the rectifier bridge and the comparator and then connected to the electronic switch A for feeding back signals and judging the on-off of the circuit according to the voltage difference; the input end of the comparator is also connected with a reference voltage;
the following test methods are also included: firstly, adjusting reference voltage according to different test materials; after one-time test is finished, the upper computer sends a control signal to the automatic zero setting device; at the moment, if the position of the light spot deviates from the zero position, the corresponding group of silicon photocells can output differential voltage due to different light irradiation areas, subtraction operation and amplification are carried out by a subtracter, and the differential voltage is compared with reference voltage through a comparator after being converted into unipolar positive voltage through a rectifier bridge; when the light spot is smaller than the reference voltage, the light spot deviates within a normal range, the photoelectric converter does not need to carry out position adjustment, the output of the comparator is 0, the electronic switch A is not closed, otherwise, when the light spot is larger than the reference voltage, the output of the comparator is logic 1, the electronic switch A is closed and divided into two paths, one path passes through the zero comparator to generate a rotation direction control signal of the stepping motor, and the stepping motor drives the synchronous belt to drive the photoelectric converter to rotate towards the direction of reducing the voltage difference of the silicon photoelectric battery pack; the other route generates a driving pulse of the stepping motor by the bipolar V/F converter, when the voltage difference of the silicon photocell group is larger, the frequency of the pulse is higher, the rotating speed of the stepping motor is faster, the movement of the photoelectric converter is faster, and the voltage difference of the silicon photocell group can be rapidly reduced; otherwise, when the voltage difference of the silicon photocell group is small, the pulse frequency is low, the position of the photoelectric converter can be finely adjusted, excessive zero adjustment is effectively avoided, the operation is circulated in sequence, until the differential voltage output by the silicon photocell group is smaller than the reference voltage, the feedback signal informs the upper computer of finishing zero adjustment, and the next mechanical spectrum test can be carried out.
2. The automatic zero setting device for the low frequency mechanical spectrum tester according to claim 1, characterized in that: the zero setting circuit also comprises an electronic switch B and an electronic switch C; and the electronic switch B and the electronic switch C are controlled by an upper computer, wherein the electronic switch B is connected between the zero-crossing comparator and the stepping motor subdivision driver, and the electronic switch C is connected between the bipolar V/F converter and the stepping motor subdivision driver.
3. The automatic zero setting device for the low frequency mechanical spectrum tester according to claim 2, characterized in that: the rack comprises two brackets vertically arranged at two ends of the base and two horizontally arranged guide rails; two ends of each guide rail are arranged on the two brackets in a vertically sliding manner through sliding blocks; the photoelectric converter can be arranged on the two guide rails in a sliding manner.
4. The automatic zero setting device for the low frequency mechanical spectrum tester of claim 3, wherein: the synchronous belt transmission mechanism comprises a synchronous driving gear and a synchronous driven gear which are respectively arranged on the base, and a synchronous belt which bypasses the synchronous driving gear and the synchronous driven gear to drive the photoelectric converter to slide; the stepping motor is connected with the synchronous driving gear through a coupler.
5. The automatic zero setting device for low frequency mechanical spectrum tester according to claim 4, characterized in that: the photoelectric converter and the synchronous belt are connected or bonded through screws or buckles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710449651.2A CN107036643B (en) | 2017-06-15 | 2017-06-15 | Automatic zero setting device for low-frequency mechanical spectrum tester |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710449651.2A CN107036643B (en) | 2017-06-15 | 2017-06-15 | Automatic zero setting device for low-frequency mechanical spectrum tester |
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| CN107036643A CN107036643A (en) | 2017-08-11 |
| CN107036643B true CN107036643B (en) | 2023-01-17 |
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| CN104849629B (en) * | 2015-04-23 | 2018-08-14 | 中国电子科技集团公司第四十一研究所 | Multipactor detects two-way microwave signal Automatic Zero Set and method |
| CN107219485B (en) * | 2017-05-22 | 2019-09-24 | 中国电子科技集团公司第四十一研究所 | Phase difference value applied to Multipactor detection calculates balancing controls and method |
| CN206832278U (en) * | 2017-06-15 | 2018-01-02 | 苏州市职业大学 | A kind of Automatic Zero Set for low frequency mechanoscopy tester |
| CN109298235B (en) * | 2018-08-17 | 2021-05-28 | 北京优诺信创科技有限公司 | Micro-discharge power dynamic tracking method |
| CN110806506B (en) * | 2019-10-23 | 2020-10-27 | 西安交通大学 | Contact impedance measurement system and method for radio frequency band electric contact element |
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