CN211904537U - On-line detection device of multifunctional pressure measurement monitoring system - Google Patents
On-line detection device of multifunctional pressure measurement monitoring system Download PDFInfo
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- CN211904537U CN211904537U CN202020888275.4U CN202020888275U CN211904537U CN 211904537 U CN211904537 U CN 211904537U CN 202020888275 U CN202020888275 U CN 202020888275U CN 211904537 U CN211904537 U CN 211904537U
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- 238000009530 blood pressure measurement Methods 0.000 title claims abstract description 57
- 238000012544 monitoring process Methods 0.000 title claims abstract description 42
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- 239000010720 hydraulic oil Substances 0.000 claims description 10
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L25/00—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
Abstract
The utility model discloses a multi-functional pressure measurement monitoring system's on-line measuring device, measure calibrating device and be used for measuring the back level measurement calibrating device of calibration pressure measurement monitoring system back level including the front end sensor. In the front-end sensor measurement and calibration device, a left cylinder body and a right cylinder body are arranged on a base in a bilateral symmetry mode through fixing rings, and a left stabilizing seat and a right stabilizing seat which are identical in structure are arranged between the two cylinder bodies; a left gear is arranged on the side surface of the left stabilizing seat, and a right gear is arranged on the side surface of the right stabilizing seat; a left screw rod, a left screw rod sleeve and a left piston are arranged in the left cylinder body; a right screw rod, a right screw rod sleeve and a right piston are arranged in the right cylinder body; the motor is fixed on the base through the bracket, and the main gear is connected with the output shaft of the motor. The utility model discloses use same detection device can solve simultaneously that the pressure measurement monitoring system promotes the holistic measurement accuracy of pressure measurement monitoring system under the device volume prerequisite of reducing from the calibration of front end sensor to the full range of rear end display system.
Description
Technical Field
The utility model belongs to the technical field of the instrument and meter detects, concretely relates to multi-functional pressure measurement monitoring system's on-line measuring device.
Background
In recent years, as the power system attaches more and more importance to the non-electric quantity protection, more and more attention is paid to the accurate and safe operation of the pressure instrument. In order to reflect the operation condition of the pressure instrument more accurately, the pressure parameter instrument needs to be tested, and meanwhile, the pressure measurement monitoring system needs to be detected in an all-around manner.
The pressure measuring and monitoring system is composed of pressure transmitter, data collector, signal processing system and terminal display unit, and can convert pressure variable into standard output signal, and can measure the pressure parameter of equipment and real-time reflect it into control system. The pressure measurement monitoring system is mainly used for remote display and control of pressure, and the pressure measurement monitoring system usually works under the environments of high temperature, low pressure, corrosion, vibration and the like, and has a high failure rate, so that the pressure measurement monitoring system is very necessary to be periodically verified or calibrated. The metering performance of a newly installed and used pressure transmitter over time, and even the entire pressure measurement monitoring system, needs to be calibrated to ensure that the metering performance meets the process requirements of the production process.
There are two problems in the detection process at present: (1) it is common practice for pressure transmitter testing to remove components and send them to a laboratory for verification or calibration of the transmitter. However, this is equivalent to calibrating only the sensor of the measurement system, and not calibrating the subsequent parameter transformation module, which cannot obtain the accuracy of the whole pressure measurement system. (2) Because voltage signals are superposed on the remote transmission signal wire of the pressure transmitter, most field environments or conditions are not favorable for the disassembly of the measuring system, and improper disassembly can cause voltage signal short circuit to cause the damage of a signal conversion plate in the control cabinet.
Therefore, the pressure measurement monitoring system taking the pressure transmitter as the core is calibrated on line, so that the accuracy of the measurement system can be clearly known, the indication value errors of all points of the pressure transmitter can be intuitively obtained, and the system calibration has practical significance.
The pressure measuring and monitoring system needs to be calibrated on line, so that a miniaturized pressure measuring device capable of simultaneously outputting pressure signals and electric measuring signals needs to be developed, the pressure signal output function of the sensor end is used for verifying the sensor, and the high-precision electric measuring signal output function of the conversion and display end is used for verifying the conversion and display part. When the sensor end is verified: the pressure equipment can only be used near a corresponding pressure measurement point for testing, but the existing pressure equipment is large and cannot be transported to the vicinity of the pressure measurement point; the existing pressure detection equipment can only provide detection in one pressure range, or a high pressure range or a low pressure range, and cannot perform pressure online detection on pressure measurement monitoring systems in multiple pressure ranges at the same time.
Meanwhile, in the prior art, no detection device capable of simultaneously realizing the pressure sensor and the rear stage (data acquisition unit, signal processing system and terminal display) of the pressure measurement monitoring system is available, and the overall comprehensive detection work on the pressure measurement monitoring system cannot be carried out on line.
Disclosure of Invention
The utility model provides a miniaturized can realize the online calibration of pressure sensor and pressure measurement monitored control system back level simultaneously to can carry out the multi-functional pressure measurement monitored control system's of high pressure measurement and low pressure measurement on-line measuring device simultaneously.
The utility model discloses the technical scheme who adopts does:
the on-line detection device of the multifunctional pressure measurement monitoring system comprises a front-end sensor measurement and calibration device and a rear-stage measurement and calibration device, wherein the rear-stage measurement and calibration device is used for measuring and calibrating the rear stage of the pressure measurement monitoring system; the front-end sensor measuring and calibrating device comprises a motor, a base, a main gear, a left gear, a right gear, a left rotating shaft, a right rotating shaft, a left stabilizing seat, a right stabilizing seat, a left screw rod, a right screw rod, a left cylinder body, a right cylinder body and a fixing ring;
the left cylinder body and the right cylinder body are arranged on the base in a bilateral symmetry mode through fixing rings, and the two cylinder bodies are used for storing different media respectively; a left stabilizing seat and a right stabilizing seat which have the same structure and are L-shaped are arranged between the two cylinder bodies, the bottom surface of the left stabilizing seat is fixedly connected with the bottom of the left cylinder body, and the bottom surface of the right stabilizing seat is fixedly connected with the bottom of the right cylinder body; a left gear is mounted on the side surface of the left stabilizing seat, and a right gear is mounted on the side surface of the right stabilizing seat;
the left cylinder body is internally provided with a left screw rod, a left screw rod sleeve and a left piston, the left end part of the left screw rod is fixedly connected with the left piston, the left screw rod is externally threaded with the left screw rod sleeve, and the right end part of the left screw rod sleeve is connected with a left gear; when the left gear rotates, the left screw rod sleeve is driven to rotate, so that the left screw rod moves back and forth left and right in the left cylinder body, and the left piston is driven to move along the left cylinder body, wherein the left piston cannot rotate in the cylinder body;
the right cylinder body is internally provided with a right screw rod, a right screw rod sleeve and a right piston, the right end part of the right screw rod is fixedly connected with the right piston, the right screw rod is externally threaded with the right screw rod sleeve, and the left end part of the right screw rod sleeve is connected with a right gear; when the right gear rotates, the right screw rod sleeve is driven to rotate, so that the right screw rod moves back and forth left and right in the right cylinder body, and the right piston is driven to move along the right cylinder body, wherein the right piston cannot rotate in the cylinder body;
the motor is fixed on the base through a bracket, the main gear is connected with an output shaft of the motor, and the main gear is meshed with the left gear and the right gear simultaneously; the motor drives the main gear to rotate, so that the left gear and the right gear are driven to rotate;
a left sliding block and a right sliding block are respectively fixed at the bottoms of the left stabilizing seat and the right stabilizing seat, and a left sliding groove and a right sliding groove which are respectively matched with the left sliding block and the right sliding block are arranged on the base, so that the left cylinder body can move left and right in the fixed ring along the left sliding groove, and the right cylinder body can move left and right in the fixed ring along the right sliding groove; when the left cylinder body moves to the leftmost end of the left chute, the left gear is separated from the main gear; when the right cylinder body moves to the rightmost end of the right chute, the right gear is separated from the main gear;
the left sliding chute and the right sliding chute are respectively provided with a limiting block which is respectively used for fixing the left sliding block at the rightmost end of the left sliding chute and the right sliding block at the leftmost end of the right sliding chute;
the end part of the left cylinder body is provided with a left mounting interface communicated with the inside of the left cylinder body, the end part of the right cylinder body is provided with a right mounting interface communicated with the inside of the right cylinder body, and each mounting interface is used for simultaneously connecting a standard instrument and an instrument to be detected.
Furthermore, a left rotating shaft is arranged in the center of the left gear, one end of the left rotating shaft is connected with the left stabilizing seat, and the other end of the left rotating shaft is connected with the left screw rod sleeve; the center of the right gear is provided with a right rotating shaft, one end of the right rotating shaft is connected with the right stabilizing seat, and the other end of the right rotating shaft is connected with the right screw rod sleeve.
Further, the left gear and the right gear are arranged in parallel and have the same size; the thickness of the main gear is larger than the thickness of the left gear and the right gear.
Furthermore, the outer surface of the left screw rod is provided with an external thread matched with the inner surface of the left screw rod sleeve, the outer surface of the right screw rod is provided with an external thread matched with the inner surface of the right screw rod sleeve, and when the main gear drives the left gear and the right gear to rotate simultaneously, the movement directions of the left screw rod and the right screw rod are opposite.
Furthermore, the limiting block is in a strip shape, and the limiting block is detachably arranged in the left sliding groove in a penetrating mode and is perpendicular to the left sliding groove; another stopper detachably runs through and sets up in right spout, is perpendicular with right spout.
Furthermore, the shapes of the left piston and the right piston are respectively matched with the shapes of the inner walls of the left cylinder body and the right cylinder body, the contact part of the left piston and the inner wall of the left cylinder body is a rubber ring, and the contact part of the right piston and the inner wall of the right cylinder body is a rubber ring.
Furthermore, the left cylinder body and the right cylinder body are both columnar cavities, and hydraulic oil and air are respectively stored in the cavities.
Further, the left installation interface and the right installation interface are both arranged upwards.
Furthermore, a thread is arranged at the mounting interface and is adapted to a standard instrument and an instrument to be detected; the standard instrument and the instrument to be detected both comprise a pressure gauge and a pressure measuring instrument.
Further, the post-stage measurement calibration device comprises a GD32F103C8 control chip, a NECTLP620 optocoupler, a digital-to-analog conversion circuit, a PI controller, a filter circuit, a power output circuit, an analog load, a signal amplification circuit, an operation circuit and an analog-to-digital conversion circuit which are sequentially connected, wherein the analog-to-digital conversion circuit is connected with the NECTLP620 optocoupler, and the GD32F103C8 control chip is further connected with a display screen.
The beneficial effects of the utility model reside in that:
in the on-line detection device of the utility model, the front end sensor measurement and calibration device adopts a double-cylinder structure, hydraulic oil is filled in one cylinder body, air is filled in the other cylinder body, the use of low-pressure measurement and high-pressure measurement can be simultaneously solved by using the same measurement and calibration device, the volume of the device is reduced, and the on-line calibration of an on-site pressure measurement system becomes possible; the front end sensor measuring and calibrating device of the utility model is also provided with a stabilizing seat and a fixing ring, so that when the gear drives the screw rod to rotate, the whole device is more stable, and the energy loss is reduced; the large gear is adopted to drive the small gear to rotate, so that the rotating speed is improved, and the target pressure can be reached in a short time. The rear stage of the pressure measurement monitoring system is measured by the rear stage measurement and calibration device, so that the online detection device can simultaneously realize the online calibration of the pressure sensor and the rear stage of the pressure measurement monitoring system, the applicability of the online detection device is improved, and the overall measurement and calibration precision of the pressure measurement monitoring system is improved.
Drawings
Fig. 1 is a schematic sectional view of the front-end sensor measurement calibration device according to the present invention;
FIG. 2 is a schematic top view of a stopper structure;
FIG. 3 is a schematic diagram of a circuit structure of the later-stage measurement calibration device according to the present invention;
FIG. 4 is a schematic diagram of a digital-to-analog conversion circuit;
FIG. 5 is a schematic circuit diagram of a power output circuit (test signal output);
FIG. 6 is a front view of the appearance structure of the on-line detection device of the present invention;
reference numerals: 1-display screen, 2 to 5 are pressure output ports, and a to L (in the form of lower case of letter L) are six pairs of electric signal output ports;
10. a base; 20. a main gear; 30. a left gear; 40. a right gear; 50. a fixing ring; 60. a motor; 70. a limiting block; 80. a standard instrument and an instrument to be detected;
31. a left rotating shaft; 32. a left stabilizing seat; 33. a left lead screw; 34. a left cylinder body; 35. a left screw rod sleeve; 36. a left piston; 37. a left slider; 38. a left chute; 39. a left mounting interface; 41. a right rotating shaft; 42. a right stabilizing seat; 43. a right screw rod; 44. a right cylinder body; 45. a right screw rod sleeve; 46. a right piston; 47. a right slider; 48. a right chute; 49. and a right mounting interface.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The utility model provides a multi-functional pressure measurement monitoring system's on-line measuring device, it is specific, a miniaturized multichannel output pressure and signal of telecommunication generating device to solve current detection device because the volume is too big can't carry out online calibration, can't realize simultaneously the problem of high pressure measurement and low pressure measurement at pressure sensor and pressure measurement monitoring system rear level online calibration, can't carry out simultaneously high pressure measurement and low pressure measurement.
The on-line detecting device includes a front-end sensor measurement calibrating device (pressure output section) and a subsequent-stage measurement calibrating device (electric signal output section) for measurement calibrating a subsequent stage of the pressure measurement monitoring system.
Referring to fig. 1 and 2, the front end sensor measurement calibration apparatus includes: the motor 60, the base 10, the main gear 20, the left gear 30, the right gear 40, the left rotating shaft 31, the right rotating shaft 41, the left stabilizing seat 32, the right stabilizing seat 42, the left screw rod 33, the right screw rod 43, the left cylinder 34, the right cylinder 44 and the fixing ring 50.
The left cylinder body 34 and the right cylinder body 44 are arranged on the base 10 in a bilateral symmetry manner through the fixing ring 50, the two cylinder bodies are cylindrical cavities and are used for storing different media respectively, in the embodiment, the media in the left cylinder body 34 are hydraulic oil, and the media in the right cylinder body 44 are air, so that micro-pressure can be generated due to the fact that the compression ratio of the air is large, and the compression ratio of the hydraulic oil is smaller than that of the air, so that high-pressure metering can be achieved. The two fixing rings 50 are used for respectively and firmly fixing the left cylinder body 34 and the right cylinder body 44 on the base 10, so that the displacement is not generated along with the rotation of the left gear 40 and the right gear 40, and the stability of the device is enhanced. A left stabilizing seat 32 and a right stabilizing seat 42 which have the same structure and are L-shaped are arranged between the two cylinder bodies, the bottom of the left stabilizing seat 32 is fixedly connected with the bottom of the left cylinder body 34, the bottom of the right stabilizing seat 42 is fixedly connected with the bottom of the right cylinder body 44, and when the left stabilizing seat 42 and the right stabilizing seat 42 move left and right, the left cylinder body 44 and the right cylinder body 44 can be driven to move left and right together. The left gear 30 is installed on the side surface of the left stabilizing seat 32, the right gear 40 is installed on the side surface of the right stabilizing seat 42, the left gear 30 is rotatably connected in the left stabilizing seat 32, the right gear 40 is rotatably connected in the right stabilizing seat 42, a lubricating structure is arranged at the connecting position, and friction is small.
The left cylinder body 34 is internally provided with a left screw rod 33, a left screw rod sleeve 35 and a left piston 36, the left end part of the left screw rod 33 is fixedly connected with the left piston 36, the outer surface of the left screw rod 33 is provided with an external thread matched with the inner surface of the left screw rod sleeve 35, the external thread of the left screw rod 33 is connected with the left screw rod sleeve 35, the right end part of the left screw rod 33 is in threaded connection with the left screw rod sleeve 35, and the left screw rod sleeve 35 drives the left screw rod 33 to move along the axial direction when. The right end of the left lead screw sleeve 35 is connected with the left gear 30. When the left gear 30 rotates, the left screw rod sleeve 35 is driven to rotate, so that the left screw rod 33 moves back and forth left and right in the left cylinder 34, and the left piston 36 is driven to move along the left cylinder 34, wherein the left piston 36 is not rotatable in the cylinder.
The right cylinder body 44 is internally provided with a right screw rod 43, a right screw rod sleeve 45 and a right piston 46, the right end part of the right screw rod 43 is fixedly connected with the right piston 46, the outer surface of the right screw rod 43 is provided with an external thread matched with the inner surface of the right screw rod sleeve 45, the external thread of the right screw rod 43 is connected with the right screw rod sleeve 45, the left end part of the right screw rod 43 is connected in the right screw rod sleeve 45 in a threaded manner, and the right screw rod sleeve 45 drives the right screw rod 43 to move along the axial direction. The left end of the right screw rod sleeve 45 is connected with the right gear 40. When the right gear 40 rotates, the right screw rod sleeve 45 is driven to rotate, so that the right screw rod 43 moves back and forth left and right in the right cylinder 44, and the right piston 46 is driven to move along the right cylinder 44, wherein the right piston 46 is not rotatable in the cylinder.
The rotation direction of the thread on the left screw 33 is opposite to that of the thread on the right screw 43, and when the main gear 20 drives the left gear 30 and the right gear 40 to rotate simultaneously, the left screw sleeve 35 and the right screw sleeve 45 start to rotate simultaneously, and the left screw 33 is driven to move leftwards and the right screw 43 is driven to move rightwards.
The balance degree of the left piston and the right piston is good, and the outer circumference is provided with an anti-corrosion sealing rubber ring. The left and right cylinder bodies, the left and right pistons are processed precisely, the inner walls of the left and right cylinder bodies have better finish, the sealing rubber rings of the left and right pistons are tightly attached to the inner walls of the left and right cylinder bodies, and the left and right pistons generate pressure in the axial movement process.
The motor 60 is fixed on the base 10 through a bracket, the rotating shaft of the main gear 20 is connected with the output shaft of the motor 60, the main gear 20 is simultaneously meshed with the left gear 30 and the right gear 40, and the left gear 30 and the right gear 40 are arranged in parallel and have the same diameter and thickness. The diameter of the main gear 20 is larger than that of the left and right gears 40, and the rotation of the larger gear drives the smaller gear to rotate, so that the rotation speed of the smaller gear can be increased, the working efficiency of the smaller gear is improved, and the required pressure can be generated as soon as possible. The thickness of the main gear 20 is greater than the sum of the thicknesses of the left and right gears 30 and 40, so that the left and right gears 40 can be rotated at the same time. The motor 60 drives the main gear 20 to rotate, thereby driving the left and right gears 30, 40 to rotate. The center of the left gear 30 is provided with a left rotating shaft 31, one end of the left rotating shaft 31 is connected with a left stabilizing seat 32, and the other end is connected with a left screw rod sleeve 35. The center of the right gear 40 is provided with a right rotating shaft 41, one end of the right rotating shaft 41 is connected with a right stabilizing seat 42, and the other end is connected with a right screw rod sleeve 45.
A left sliding block 37 and a right sliding block 47 are respectively fixed below the bottoms of the left stabilizing seat 32 and the right stabilizing seat 42, and a left sliding groove 38 and a right sliding groove 48 which are respectively matched with the left sliding block 37 and the right sliding block 47 are arranged on the base 10, so that the left stabilizing seat 32 can drive the left cylinder body 34 to move left and right in the fixing ring 50 along the left sliding groove 38, and the right stabilizing seat 42 can drive the right cylinder body 44 to move left and right in the fixing ring 50 along the right sliding groove 48. When the left cylinder 34 moves to the leftmost end of the left chute 38, the left gear 30 is separated from the main gear 20 and does not rotate along with the rotation of the main gear 20. When the right cylinder 44 moves to the rightmost end of the right chute 48, the right gear 40 is disengaged from the main gear 20 and does not rotate with the rotation of the main gear 20.
All be equipped with stopper 70 in left spout 38, the right spout 48, stopper 70 has two in this embodiment, is rectangular shape, and a stopper 70 detachably runs through and sets up in the left spout, and is perpendicular with the left spout. The other limiting block 70 is detachably disposed in the right sliding groove in a penetrating manner, and is perpendicular to the right sliding groove. The limiting block 70 is used for fixing the left slider 37 at the rightmost end of the left sliding chute 38, and the right slider 47 at the leftmost end of the right sliding chute 48. At this time, the left gear 30 and the right gear 40 are both located below the main gear 20 and engaged with the main gear 20, and the main gear 20 rotates to drive the left gear 40 and the right gear 40 to rotate together. When the left gear 30 only needs to rotate and the right gear 40 does not need to rotate, the limiting block 70 in the right sliding chute 48 only needs to be completely pulled out manually, the right sliding block 47 slides to the rightmost end of the right sliding chute 48, at the moment, the right gear 40 moves rightwards along with the right cylinder body 44 and is separated from the main gear 20, and the rotation of the main gear 20 does not affect the right gear 40 and the right cylinder body 44.
The end part of the left cylinder body 34 is provided with a left mounting interface 39 communicated with the inside of the left cylinder body 34, the end part of the right cylinder body 44 is provided with a right mounting interface 49 communicated with the inside of the right cylinder body 44, and each mounting interface faces upwards to avoid hydraulic oil in the cylinder body from overflowing when the detection device is not in operation. Each mounting interface is provided with two external interfaces in parallel, the external threads of the external interfaces are used for being adapted to simultaneously connect a standard instrument and an instrument to be detected, namely, the left mounting interface 39 can simultaneously connect a standard instrument and an instrument to be detected, and the right mounting interface 49 can simultaneously connect a standard instrument and an instrument to be detected, in the embodiment, the left mounting interface 39 can connect a standard pressure gauge and a pressure measuring instrument to be detected.
The utility model discloses in, the calibrating device is measured to the front end sensor at the during operation, and the medium in left cylinder body 34 and the right cylinder body 44 is hydraulic oil and air respectively. If it is desired to perform both high pressure and low pressure measurements, the mounting interface of the left cylinder 34 is connected to a standard instrument and a test instrument, and the mounting interface of the right cylinder 44 is also connected to a standard instrument and a test instrument. At this time, the left stopper 70 is located in the left slide groove 38, the left slider 37 is fixed to the rightmost end of the left slide groove 38, and the right stopper 70 is located in the right slide groove 48, and the right slider 47 is fixed to the leftmost end of the right slide groove 48.
The main gear 20 is powered by the motor 60, and the main gear 20 rotates to drive the left gear 30 and the right gear 40 to rotate simultaneously. The left gear 30 drives the left screw rod sleeve 35 to rotate, the left screw rod 33 axially moves leftwards through threaded connection with the screw rod sleeve, the left piston 36 is driven to move leftwards to generate pressure, the standard instrument and the instrument 80 to be detected (a pressure measurement monitoring system to be detected) both display readings, and the two readings are compared to check the pressure measurement monitoring system.
If only low-pressure metering is needed, the limiting block 70 on the side where the hydraulic oil is filled can be pulled out, the sliding block slides to the other end of the sliding groove, the sliding block drives the stabilizing seat to move at the moment, the gear corresponding to the side of the cylinder body where the hydraulic oil is filled is separated from the main gear 20, then the rotation of the main gear 20 has no influence on the cylinder body where the hydraulic oil is filled, and energy is saved.
When only high-pressure metering is carried out, the operated cylinder body is replaced by the cylinder body filled with air, so that the cylinder body filled with air does not work when the driving wheel 20 rotates, and the specific operation is the same as the method.
As shown in fig. 3, the post-stage measurement calibration device includes a GD32F103C8 control chip, a NECTLP620 opto-coupler, a digital-to-analog conversion circuit, a PI controller, a filter circuit, a power output circuit, an analog load, a signal amplification circuit, an arithmetic circuit, and an analog-to-digital conversion circuit, which are connected in sequence, where the analog-to-digital conversion circuit is connected with the NECTLP620 opto-coupler, and the GD32F103C8 control chip is further connected with a display screen 1.
The later-stage measurement calibration device adopts a GD32F103C8 control chip introduced by GD company as a control core of the whole circuit, and uses a NECTLP620 optical coupler as a photoelectric protection measure of the whole circuit.
An NECTLP620 optical coupler (a photoelectric isolation circuit) is arranged between the GD32F103C8 control chip and the digital-to-analog conversion circuit, the input and the output are mainly subjected to photoelectric isolation, and the control circuit can be protected from being damaged due to overhigh external voltage while level conversion is achieved. The PI controller continuously collects voltage drop on the sampling resistor based on the operational amplifier, adjusts output of current at any time and finally outputs stable current.
As the digital-to-analog conversion circuit shown in the figure 4 needs high precision and low adjustment fineness of direct current in field test, a 1595B chip produced by LTC company is selected, the whole circuit can quickly reach a steady state value after being output from analog quantity, the response time is not more than 2 muS, and the 6 th pin and the 7 th pin of an LTC1595B chip are connected with a GD32F103C8 control chip through a NECTLP620 optical coupler.
The power output circuit (test signal output circuit) actually establishes a linear correspondence relationship between the output current and the output voltage after D/a conversion, and the output dc current is stable and does not change with the change of the load, as shown in fig. 5. The PI controller based on the operational amplifier is added in the circuit, so that the output current can be quickly regulated and stably output. The final stage adopts 2 power triodes connected in parallel, and a small resistor of 0.1 omega is connected in series in the transmitting stage of the final stage to play a role in balancing multipath current. The working principle of the power output circuit V/I (voltage/current) conversion is elucidated by calculation as follows: assumed to flow through a standard sampling resistor RfxThe current value of (x is 1-5) is I0Then feedback voltage Uf＝I0×Rf。
UfObtaining a voltage U through a first-stage inverse operational amplifier2：
According to the principles of 'virtual short' and 'virtual break' of the amplifier, the method comprises the following steps:
then the initial condition U1And (3) finishing to obtain:
resistance R1、R2、R10、R12And RfAfter the determination, the value is a fixed value, and can be known from formula (3): output current I0And a set voltage ViIs linear in relation to each other, and ViIs an output voltage and can be controlled by a host computer. In this example, R is taken1＝20kΩ，R2＝10kΩ，R10＝10kΩ，R 12100k Ω, if RfWhen 1 Ω, I can be calculated0＝100mA。
The utility model discloses an on-line measuring device can integrate into the structural style that figure 6 shows, and its positive top sets up 6 to the signal of telecommunication delivery outlet for it detects to upgrade behind the pressure measurement monitoring system. And 4 pressure output ports are arranged below the front surface of the front end sensor and used for butt joint detection of the front end sensor. The display 1 is used for displaying the detection calibration result.
The device provided by the utility model is small, convenient to carry, with integrative equipment, both have high pressure measurement function and have low pressure measurement function, can carry out online detection to different high-pressure measurement system and low pressure measurement system simultaneously, still can solve the whole calibration of pressure measurement monitoring system from front end sensor to rear end display system simultaneously by same detection device, promoted the holistic measurement calibration precision of pressure measurement monitoring system.
Above only the utility model discloses an it is preferred embodiment, the utility model discloses a scope of protection not only limits in above-mentioned embodiment, and the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, a plurality of modifications and decorations without departing from the principle of the present invention should be considered as the protection scope of the present invention.
Claims (10)
1. The on-line detection device of the multifunctional pressure measurement monitoring system is characterized by comprising a front-end sensor measurement calibration device and a rear-stage measurement calibration device for measuring and calibrating the rear stage of the pressure measurement monitoring system; the front end sensor measuring and calibrating device comprises a motor (60), a base (10), a main gear (20), a left gear (30), a right gear (40), a left rotating shaft (31), a right rotating shaft (41), a left stabilizing seat (32), a right stabilizing seat (42), a left screw rod (33), a right screw rod (43), a left cylinder body (34), a right cylinder body (44) and a fixing ring (50);
the left cylinder body (34) and the right cylinder body (44) are arranged on the base (10) in a bilateral symmetry mode through the fixing ring (50), and the two cylinder bodies are used for storing different media respectively; a left stabilizing seat (32) and a right stabilizing seat (42) which have the same structure and are L-shaped are arranged between the two cylinder bodies, the bottom surface of the left stabilizing seat (32) is fixedly connected with the bottom of the left cylinder body (34), and the bottom surface of the right stabilizing seat (42) is fixedly connected with the bottom of the right cylinder body (44); a left gear (30) is arranged on the side surface of the left stabilizing seat (32), and a right gear (40) is arranged on the side surface of the right stabilizing seat (42);
a left screw rod (33), a left screw rod sleeve (35) and a left piston (36) are arranged in the left cylinder body (34), the left end part of the left screw rod (33) is fixedly connected with the left piston (36), the left screw rod (33) is externally threaded with the left screw rod sleeve (35), and the right end part of the left screw rod sleeve (35) is connected with the left gear (30); when the left gear (30) rotates, the left screw rod sleeve (35) is driven to rotate, so that the left screw rod (33) moves back and forth left and right in the left cylinder body (34), and the left piston (36) is driven to move along the left cylinder body (34), wherein the left piston (36) cannot rotate in the cylinder body;
a right screw rod (43), a right screw rod sleeve (45) and a right piston (46) are arranged in the right cylinder body (44), the right end part of the right screw rod (43) is fixedly connected with the right piston (46), the right screw rod (43) is in external thread connection with the right screw rod sleeve (45), and the left end part of the right screw rod sleeve (45) is connected with the right gear (40); when the right gear (40) rotates, the right screw rod sleeve (45) is driven to rotate, so that the right screw rod (43) moves back and forth left and right in the right cylinder body (44), and the right piston (46) is driven to move along the right cylinder body (44), wherein the right piston (46) cannot rotate in the cylinder body;
the motor (60) is fixed on the base (10) through a bracket, the main gear (20) is connected with an output shaft of the motor (60), and the main gear (20) is meshed with the left gear (30) and the right gear (40) simultaneously; the motor (60) drives the main gear (20) to rotate, so that the left gear (30) and the right gear (40) are driven to rotate;
a left sliding block (37) and a right sliding block (47) are respectively fixed at the bottoms of the left stabilizing seat (32) and the right stabilizing seat (42), and a left sliding chute (38) and a right sliding chute (48) which are respectively matched with the left sliding block (37) and the right sliding block (47) are arranged on the base (10), so that the left cylinder body (34) can move left and right in the fixing ring (50) along the left sliding chute (38), and the right cylinder body (44) can move left and right in the fixing ring (50) along the right sliding chute (48); when the left cylinder body (34) moves to the leftmost end of the left chute (38), the left gear (30) is separated from the main gear (20); when the right cylinder body (44) moves to the rightmost end of the right chute (48), the right gear (40) is separated from the main gear (20);
limiting blocks (70) are arranged in the left sliding groove (38) and the right sliding groove (48) and are respectively used for fixing the left sliding block (37) at the rightmost end of the left sliding groove (38) and fixing the right sliding block (47) at the leftmost end of the right sliding groove (48);
the end part of the left cylinder body (34) is provided with a left mounting interface (39) communicated with the inside of the left cylinder body (34), the end part of the right cylinder body (44) is provided with a right mounting interface (49) communicated with the inside of the right cylinder body (44), and each mounting interface is used for simultaneously connecting a standard instrument and an instrument to be detected.
2. The on-line detection device of the multifunctional pressure measurement and monitoring system as claimed in claim 1, wherein a left rotating shaft (31) is arranged at the center of the left gear (30), one end of the left rotating shaft (31) is connected with the left stabilizing base (32), and the other end is connected with the left screw rod sleeve (35); the center of the right gear (40) is provided with a right rotating shaft (41), one end of the right rotating shaft (41) is connected with a right stabilizing seat (42), and the other end is connected with a right screw rod sleeve (45).
3. The on-line measuring device of the multifunctional pressure measuring and monitoring system as claimed in claim 1, wherein the left gear (30) and the right gear (40) are arranged in parallel and have the same size; the thickness of the main gear (20) is larger than the thickness of the left gear (30) and the right gear (40).
4. The on-line detection device of the multifunctional pressure measurement and monitoring system as claimed in claim 1, wherein the outer surface of the left screw (33) is provided with an external thread adapted to the inner surface of the left screw sleeve (35), the outer surface of the right screw (43) is provided with an external thread adapted to the inner surface of the right screw sleeve (45), and when the main gear (20) drives the left gear (30) and the right gear (40) to rotate simultaneously, the left screw (33) and the right screw (43) move in opposite directions.
5. The on-line detection device of the multifunctional pressure measurement and monitoring system as claimed in claim 1, wherein the stopper (70) is in a strip shape, and a stopper (70) is detachably disposed in the left sliding groove in a penetrating manner and is perpendicular to the left sliding groove; the other limiting block (70) is detachably arranged in the right sliding groove in a penetrating mode and is perpendicular to the right sliding groove.
6. The on-line detection device of the multifunctional pressure measurement and monitoring system according to claim 1, wherein the shape of the left piston (36) and the right piston (46) is matched with the shape of the inner wall of the left cylinder (34) and the right cylinder (44), and the contact part of the left piston (36) and the inner wall of the left cylinder (34) is a rubber ring, and the contact part of the right piston (46) and the inner wall of the right cylinder (44) is a rubber ring.
7. The on-line detection device of the multifunctional pressure measurement and monitoring system according to claim 1, wherein the left cylinder (34) and the right cylinder (44) are both cylindrical cavities, and hydraulic oil and air are respectively stored in the cavities.
8. The on-line measuring device of a multifunctional pressure measuring and monitoring system as claimed in claim 1, wherein the left mounting interface (39) and the right mounting interface (49) are both disposed upward.
9. The on-line detection device of the multifunctional pressure measurement and monitoring system as claimed in claim 1, wherein the mounting interface is provided with threads to fit a standard instrument and an instrument to be detected (80); the standard instrument and the instrument (80) to be detected both comprise a pressure gauge and a pressure measuring instrument.
10. The on-line detection device of the multifunctional pressure measurement and monitoring system as claimed in claim 1, wherein the post-stage measurement calibration device comprises a GD32F103C8 control chip, a NECTLP620 optical coupler, a digital-to-analog conversion circuit, a PI controller, a filter circuit, a power output circuit, an analog load, a signal amplification circuit, an arithmetic circuit and an analog-to-digital conversion circuit which are connected in sequence, the analog-to-digital conversion circuit is optically coupled with the NECTLP620, and the GD32F103C8 control chip is further connected with a display screen (1).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910483804.4A CN110146221A (en) | 2019-06-04 | 2019-06-04 | A kind of on-line measuring device of pressure measurement monitoring system |
| CN2019104838044 | 2019-06-04 |
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| CN211904537U true CN211904537U (en) | 2020-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910483804.4A Pending CN110146221A (en) | 2019-06-04 | 2019-06-04 | A kind of on-line measuring device of pressure measurement monitoring system |
| CN202010446790.1A Active CN111413026B (en) | 2019-06-04 | 2020-05-25 | On-line detection device of multifunctional pressure measurement monitoring system |
| CN202020888275.4U Withdrawn - After Issue CN211904537U (en) | 2019-06-04 | 2020-05-25 | On-line detection device of multifunctional pressure measurement monitoring system |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910483804.4A Pending CN110146221A (en) | 2019-06-04 | 2019-06-04 | A kind of on-line measuring device of pressure measurement monitoring system |
| CN202010446790.1A Active CN111413026B (en) | 2019-06-04 | 2020-05-25 | On-line detection device of multifunctional pressure measurement monitoring system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111413026A (en) * | 2019-06-04 | 2020-07-14 | 江苏方天电力技术有限公司 | On-line detection device of multifunctional pressure measurement monitoring system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113776571B (en) * | 2021-07-30 | 2023-06-27 | 华电电力科学研究院有限公司 | Online calibration method for thermal monitoring instrument of power plant |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201107154Y (en) * | 2007-11-20 | 2008-08-27 | 成都市精测科技有限公司 | Pressure full-automatic checking apparatus |
| CN102252805B (en) * | 2011-05-26 | 2013-01-02 | 北京康斯特仪表科技股份有限公司 | Multi-range field full-automatic pressure and electric signal calibrating instrument |
| CN205562115U (en) * | 2016-03-04 | 2016-09-07 | 江苏方天电力技术有限公司 | Double - circuit control pressure measurement of two media |
| WO2019011353A1 (en) * | 2017-07-14 | 2019-01-17 | 北京康斯特仪表科技股份有限公司 | Pressure calibration apparatus and pressure instrument calibration information processing method |
| CN110146221A (en) * | 2019-06-04 | 2019-08-20 | 江苏方天电力技术有限公司 | A kind of on-line measuring device of pressure measurement monitoring system |
-
2019
- 2019-06-04 CN CN201910483804.4A patent/CN110146221A/en active Pending
-
2020
- 2020-05-25 CN CN202010446790.1A patent/CN111413026B/en active Active
- 2020-05-25 CN CN202020888275.4U patent/CN211904537U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111413026A (en) * | 2019-06-04 | 2020-07-14 | 江苏方天电力技术有限公司 | On-line detection device of multifunctional pressure measurement monitoring system |
| CN111413026B (en) * | 2019-06-04 | 2024-04-05 | 江苏方天电力技术有限公司 | On-line detection device of multifunctional pressure measurement monitoring system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111413026B (en) | 2024-04-05 |
| CN110146221A (en) | 2019-08-20 |
| CN111413026A (en) | 2020-07-14 |
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