专

一种用于人工指甲分拣包装的自动化装置

KR423091A1

发明人

段学超, 程璧, 干觐瑞, 杨勇智, 董明晶, 李浩

受让人

西安电子科技大学

申请人

Goodrich Corporation

申请号

005440

申请日

2005-01-17

公开(公告)号

KR423091A1

公开(公告)日

2002-07-08

IPC分类号

A61F013/15A61F013/472A61F013/494A61F013/511A61F013/515A61F013/53A61F013/56A61F013/20

CPC分类号

优先权号

017630

优先权日

2007-10-30

摘要

The operational amplifier circuit has two input nodes (28,29) and an output node (36). A differential amplifier input stage (21) coupled between two voltage sources produces an inverted amplified output signal on the basis of a difference voltage applied to the input nodes. An output stage (22) coupled between the voltage sources is responsive to the amplified signal producing a signal at the output node w.r.t the difference voltage.

A phase compensating circuit (23) coupled between the input and output stages absorbs a distortion appearing in the amplifier section to allow the output signal to vary w.r.t the difference voltage. A biasing circuit (24) allows constant currents corresponding to the biasing voltage signal to flow through the two stages.

权利要求

1. A method of monitoring a flow rate of a liquid additive pumped to a mixing tank, comprising: measuring the flow rate of the liquid additive pumped to the mixing tank with a flow meter; transmitting the measurements of the flow rate of the liquid additive pumped to the mixing tank to a controller; and transmitting, from a variable frequency drive (VFD), measurements of a rotational speed of a motor to the controller, wherein the VFD is coupled to the motor and the motor drives a pump which pumps the liquid additive to the mixing tank; wherein: when the measurements of the flow rate of the liquid additive from the flow meter are non-zero: utilizing the measurements transmitted to the controller from the flow meter as feedback to compare against a designated set point; calculating an error between the feedback and the designated set point to calculate an updated output; and transmitting the updated output to the VFD to change the flow rate of the liquid additive; and when the measurements of the flow rate of the liquid additive are not non-zero: transmitting measurements from a level sensor to the controller, wherein the level sensor measures a level of the liquid additive in a storage tank; determining whether the flow rate of the liquid additive pumped to the mixing tank is a non-zero rate based on the rotational speed measurements, and the level sensor measurements, wherein all of the measurements are made at a same time; utilizing the measurements transmitted to the controller as feedback to compare against a designated set point; calculating an error between the feedback and the designated set point to calculate an updated output; and transmitting the updated output to the VFD to change the flow rate of the liquid additive.

2. The method of claim 1 , wherein the designated set point is an optimal flow rate of the liquid additive selected from a range of about 0 gpm to about 50 gpm.

3. The method of claim 1 , further comprising actuating the level sensor to measure the height of the liquid additive within the storage tank, wherein the level sensor is disposed on top of the storage tank.

4. The method of claim 3 , wherein the controller is configured to determine a rate at which the liquid additive is flowing out of the storage tank based, at least in part, on the measurements of the height of the liquid additive within the storage tank.

5. The method of claim 4 , wherein determining the rate at which the liquid additive is flowing out of the storage tank comprises multiplying the rate at which the height of the liquid additive within the storage tank is changing with the volume of liquid additive per unit of length.

6. The method of claim 5 , wherein the volume of liquid additive per unit of length is determined by utilizing a tank strap algorithm or chart.

7. The method of claim 1 , further comprising actuating the motor to increase or decrease in rotational speed based, at least in part, on the updated output.

8. The method of claim 1 , further comprising displaying an alert on a display indicating possible failures selected from the group consisting of a secondary pump being stuck or disengaged, a technical issue with the flow meter, a valve coupled to a tank is closed, the designated set point is set to zero, there is a connection problem where feedback is not being received by the controller, and any combinations thereof.

9. The method of claim 1 , wherein determining whether the flow rate of the liquid additive is a non-zero rate comprises determining whether the rotational speed is a non-zero value.

10. The method of claim 1 , further comprising selecting a source selected from the group consisting of the flow meter, the VFD, and the level sensor that transmits measurements closest in comparison to the designated set point.

11. A method of monitoring a flow rate of a liquid additive pumped to a mixing tank, comprising: measuring the flow rate of the liquid additive pumped to the mixing tank with a flow meter; transmitting the measurements of the flow rate of the liquid additive pumped to the mixing tank to a controller; and transmitting, from a variable frequency drive (VFD), measurements of a rotational speed of a motor to the controller, wherein the VFD is coupled to the motor and the motor drives a pump which pumps the liquid additive to the mixing tank; wherein: when the measurements of the flow rate of the liquid additive from the flow meter are non-zero: utilizing the measurements transmitted to the controller from the flow meter as feedback to compare against a designated set point; calculating an error between the feedback and the designated set point to calculate an updated output; and transmitting the updated output to the VFD to change the flow rate of the liquid additive; and when the measurements of the flow rate of the liquid additive are not non-zero: transmitting measurements from a weight scale to the controller, wherein the weight scale measures a weight of the liquid additive in a storage tank; determining whether the flow rate of the liquid additive pumped to the mixing tank is a non-zero rate based on the rotational speed measurements, and the weight scale measurements, wherein all of the measurements are made at a same time; utilizing the measurements transmitted to the controller as feedback to compare against a designated set point; calculating an error between the feedback and the designated set point to calculate an updated output; and transmitting the updated output to the VFD to change the flow rate of the liquid additive.

12. The method of claim 11 , further comprising actuating the weight scale to measure the weight of the liquid additive within the storage tank and the weight of storage tank, wherein the storage tank is disposed on top of the weight scale.

13. The method of claim 12 , wherein the controller is configured to determine a rate at which the liquid additive is flowing out of the storage tank based, at least in part, on the measurements of the weight of the liquid additive within the storage tank.

14. The method of claim 13 , wherein determining the rate at which the liquid additive is flowing out of the storage tank comprises dividing the difference of the weight of the storage tank being empty from the storage tank being filled with liquid additive by the weight per volume of the liquid additive.

15. The method of claim 11 , further comprising transmitting measurements from a level sensor to the controller, wherein the level sensor is disposed on top of the storage tank.

16. The method of claim 15 , further comprising selecting a source, with the controller, selected from the group consisting of the flow meter, the VFD, the weight sensor, and the level sensor that transmits measurements closest in comparison to the designated set point.

17. The method of claim 11 , further comprising actuating the motor to increase or decrease in rotational speed based, at least in part, on the updated output.

18. The method of claim 11 , wherein determining whether the flow rate of the liquid additive is a non-zero rate comprises determining whether the rotational speed is a non-zero value.

19. The method of claim 11 , wherein the designated set point is an optimal flow rate of the liquid additive selected from a range of about 0 gpm to about 50 gpm.

20. The method of claim 11 , further comprising displaying an alert on a display indicating possible failures selected from the group consisting of a secondary pump being stuck or disengaged, a technical issue with the flow meter, a valve coupled to the tank is closed, the designated set point is set to zero, there is a connection problem where feedback is not being received by the controller, and any combinations thereof.

说明书

[0001]Technical Field The invention relates to the field of anti-interference devices, in particular to a device and a method for eliminating interference of external vibration to a photoacoustic cell. Background Art The photoacoustic effect is that monochromatic light modulated with a beam intensity is irradiated onto a sample sealed in the photoacoustic cell, and the sample absorbs light energy and releases heat energy so that the sample and the surrounding medium generate periodic heating according to the modulation frequency of light, thereby causing periodic pressure fluctuation of the medium. This pressure fluctuation can be detected by a sound-sensitive element, for example a sensitive microphone or a piezoelectric ceramic microphone, and a photoacoustic signal is obtained by amplification. The photoacoustic spectrometry technology is a novel spectral analysis detection technology based on photoacoustic effect. The photoacoustic spectroscopy technology does not directly measure the spectrum itself, but acquires spectral information by detecting a sound wave thermally excited by a substance after absorbing radiation. The photoacoustic spectrograph based on the photoacoustic spectrometry technology is suitable for measurement of low-concentration samples. The photoacoustic cell serves as a core component in a photoacoustic spectrometer, which is both a container of a gas sample and a carrier of a sound-sensitive element. During the working operation of the photoacoustic spectrograph, the external vibration can generate sound waves which interfere with the detection signals in the photoacoustic cell, especially the sound waves with the same frequency as the detection signals, and the influence on the detection result is even. Content of the invention In view of the problems existing in the prior art, the invention aims to provide an anti-interference device which can be applied to eliminating interference of external vibration to a photoacoustic cell detection signal in the photoacoustic spectrometry technology. The invention provides a device for eliminating interference of external vibration to a photoacoustic cell, and the device comprises a concave groove. The panel comprises first elastic elements, second elastic elements and third elastic elements. The first Elastic element's one end is fixed on the bottom plate of concave groove, and perpendicular with the bottom plate, first elastic element's the other end is connected with the panel, the panel is located the concave groove, and with the bottom plate is parallel. The second Elastic element and third elastic element all are parallel with the panel, second elastic element and third elastic element are perpendicular to each other. The second Elastic element's one end fixed connection is on the inner wall of concave groove, and the other end is connected with the first positioning bush of setting on the panel. The third Elastic element's one end fixed connection is on the inner wall of concave groove, and the other end is connected with the second positioning bush of setting on the panel. As an alternative embodiment of the invention, the 1st-elastic element is used. The second Elastic element, third elastic element are spring. As an optional embodiment of the invention, the first elastic element, second elastic element and third elastic element are all provided with a plurality of elastic elements, so that the panel is in a mechanical equilibrium state. As an alternative embodiment of the invention, the second elastic element and the third elastic element are located at four corners of the groove. Further, the second elastic element and the third elastic element are arranged in pairs at each corner of the concave groove. As an alternative embodiment of the invention, the 1st-elastic element is connected with the panel by an adjusting screw. As an alternative embodiment of the invention, the second elastic element is connected with the first positioning bush by an adjusting screw. As an alternative embodiment of the invention, the third spring means is connected to the second positioning bushing by means of an adjusting screw. The system comprises the device for eliminating the interference of the external vibration to the photoacoustic cell, the photoacoustic cell, the vibration signal collecting device, the photoacoustic cell and the vibration signal collecting device arranged on the panel. When the system is interfered by external vibration, the first elastic element, second elastic element and third elastic element are adjusted, so that the system achieves the state of mechanical balance, and interference of external vibration to a detection signal in the photoacoustic cell is counteracted. The mechanical balance state of the anti-interference device can be kept by adjusting the pre-tightening force of the elastic device when an object such as a photoacoustic cell is placed on the device, and interference of the external vibration to the photoacoustic cell sound wave signal can be counteracted by adjusting the elastic device. The system for eliminating interference of the external vibration on the photoacoustic cell can be applied to an on-line monitoring instrument in the cabinet, and the accuracy of monitoring results is effectively improved. Description of drawings 1 Is a schematic diagram of a device for eliminating interference of external vibration to an acoustic pool. 2 Is a schematic cross-section 1-C of FIG. C. Mode of execution The following describes specific embodiments of the present invention in more detail with reference to the accompanying drawings and embodiments in order to be able to better understand the advantages of aspects of the solution and of the present invention. However, the specific embodiments and examples described below are for illustrative purposes only and are not intended to limit the present invention. The invention firstly provides a device capable of eliminating the interference of external vibration to a photoacoustic cell, and the device is also called an anti-interference device in the invention. As shown 1, the anti-interference device of the present invention includes a concave groove 1, a panel 2, first elastic members 31, second elastic members 32, third elastic members 33. 1 Is a schematic view of an anti-interference device according to an embodiment of the present invention, first of the elastic members 31, second elastic members 32, third elastic members 33 do not have a limiting effect, and can be adjusted according to practical needs in different embodiments of the present invention so that the panel 2 can maintain a state of mechanical balance. As shown 2, the cross section 1-C in FIG. C is a cross-sectional schematic view. To FIG. 2, in the present invention, one end of first elastic member 31 is fixedly connected to the bottom plate of the groove 1. The first elastic member 31 and the bottom plate are perpendicular to each other. The first Elastic member 31 is connected to panel 2 at the other end, and panel 2 is located in groove 1, and panel 2 is parallel with the bottom plate of groove 1. Optionally, first of the elastic element 31 of the present invention is a spring. In different embodiments of the invention, different elastic elements may also be selected according to the actual need. Further, first elastic member 31 is a conical compression spring, and one end with a thicker cross section of the conical compression spring is connected to the bottom plate of the groove 1. Optionally, the first elastic element 31 is connected to the panel 2 by means of an adjusting screw 6. Further, by adjusting the degree of tightness of the adjusting screw 6, pressing or releasing first of the elastic member 31 is realized. 1 And 2, second of the elastic members 32 and third are both parallel to the panel 33 2. Also, second elastic members 32 and third are perpendicular to each other between the elastic members 33. Optionally, second elastic members 32 and third are located above the panel 33 to facilitate adjustment 2 of the biasing force of the elastic members second and 32 of the elastic member third 33. To 2, one end of a second elastic member 32 is fixedly connected to the inner wall of the groove 1, and the other end is connected to 2 positioning bush first provided on the panel 4 so as to realize a connection between second elastic member 32 and panel 2. Wherein, first location bush 4 is perpendicular with the bottom plate of groove 1. Optionally, second elastic elements 32 and first are connected with positioning bushings 4 by adjusting screws 6, so that by adjusting the degree of tightness of the adjusting screws 6, the stretching or shortening of second elastic elements 32 is realized. Alternatively, the second elastic member 32 and first positioning bushing 4 are further provided with a gasket 5, and 6 elastic members second shims 32 and 5 positioning bushings first are sequentially fixed to the panel 4 by adjusting screws 2 to realize the connection between second elastic members 32 and the panel 2. The arrangement of the spacers 5 makes the fixed connection between second elastic elements 32 and first positioning bush 4 more stable and durable. Further, one end of third elastic member 33 is fixedly connected to the inner wall of groove 1, and the other end is connected to 2 positioning bush provided on panel 2nd. In the present invention, the connection between third elastic member 33 and panel 2 is the same as that between second elastic member 32 and panel 2, which will not be described again herein. Optionally, in the present invention, second elastic members 32 and third 33 each have a spring selected from the group consisting of a spring. In different embodiments of the present invention, different kinds of elastic elements may also be selected according to actual needs. Still further, second elastic element 32 and third elastic element 33 each use a tension spring. In this case, it is necessary to provide a plurality 2 elastic members first 31 elastic members second and 32 elastic members third so that the panel 33 2 is in a state of mechanical balance. Further, the positions, the number and the strength 2 of the elastic members first 31, and second of the elastic members are adjusted according to the weight third and the position of the object placed on the panel 33 32, and the like. Optionally, in order to first keep the equilibrium state in each small area on the panel 2, first elastic elements 31 are provided in pairs. Further, second elastic members 32 and third are provided at four corners of the groove 33 with elastic members 1. Further, in order to better hold the balance state of the panel 2, 1 elastic members second and 32 are provided at the corners of each groove third 33 elastic members second and 32 elastic members third 33 are provided in pairs. The system comprises the anti-interference device, the photoacoustic cell, the vibration signal acquisition device, the photoacoustic cell and the vibration signal acquisition device arranged on the panel of the anti-interference device. As an application of the system, due to the fact that the types and numerical values of the vibration frequency in the cabinet are stable, the system is applied to an online monitoring instrument in the cabinet, and the accuracy of monitoring results can be well improved. In addition, the invention further provides a method for eliminating interference of external vibration to an acoustic pool by utilizing the system, and the working process is as follows: The groove 1 in the anti-interference device serves as a base and a supporting body of the whole anti-interference device, and the concave groove 1 itself does not generate vibration in the system and is a medium for receiving external vibration. The system is arranged on the vibration experiment table, and firstly, the vibration experiment table does not vibrate, that is, when no external vibration exists, the photoacoustic cell sound wave signal is obtained through the vibration signal acquisition device. Then, after vibration is applied to the vibration laboratory bench and the concave groove 1 receives external vibration, the elastic element first and 31 of second spring elements 32 are transmitted to the panel third 2 through 33 elastic elements 2, and the photoacoustic effect of the sample in the photoacoustic cell is influenced. At this time, by adjusting the tightness of the adjusting screw 6, stretching or shortening of first elastic members 31, and second elastic members 32 and third elastic members 33 is achieved, so that the system achieves the state of mechanical balance. Finally, it should be noted that the above-described embodiments are merely examples of the present invention for the sake of clarity and are not intended to limit the embodiments. Other different forms of variation or variation may also be made on the basis of the above description for one of ordinary skill in the art. It is not necessary here to exhaustively enumerate all of the embodiments. However, it is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims.

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