阅读说明：本技术 一种多功能压力测量监视系统的在线检测装置 (On-line detection device of multifunctional pressure measurement monitoring system ) 是由 叶加星 倪向红 崔尧尧 徐浩然 吕佳 孙雄 包玉树 吴锁贞 李金俊 王少华 梅益 于 2020-05-25 设计创作，主要内容包括：本发明公开了一种多功能压力测量监视系统的在线检测装置,包括前端传感器测量校准装置和用于测量校准压力测量监视系统后级的后级测量校准装置。前端传感器测量校准装置中,左缸体和右缸体通过固定环左右对称地设置在底座上,两缸体之间安装有结构相同的左稳定座、右稳定座；左稳定座侧面安装有左齿轮,右稳定座侧面安装有右齿轮；左缸体中设有左丝杆、左丝杆套、左活塞；右缸体中设有右丝杆、右丝杆套、右活塞；电机通过支架固定在底座上,主齿轮与电机输出轴相连。本发明使用同一检测装置能够同时解决压力测量监视系统从前端传感器到后端显示系统的全范围的校准,在缩小装置体积前提下提升压力测量监视系统整体的测量精度。(The invention discloses an on-line detection device of a multifunctional pressure measurement monitoring system, which comprises a front-end sensor measurement and calibration device and a rear-stage measurement and calibration device for measuring and calibrating the rear stage of the pressure measurement monitoring system. 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 invention can simultaneously solve the full-range calibration of the pressure measurement monitoring system from the front-end sensor to the rear-end display system by using the same detection device, and improves the overall measurement precision of the pressure measurement monitoring system on the premise of reducing the volume of the device.)

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), the two cylinder bodies are used for storing different media respectively, a left stabilizing seat (32) and a right stabilizing seat (42) which are identical in structure and are both L-shaped are installed 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), 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 installed on the side surface of the left stabilizing seat (32), and a right gear (40) is installed 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 and calibration device comprises a GD32F103C8 control chip, a NECT L P620 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 connected with the NECT L P620 optical coupler, and the GD32F103C8 control chip is further connected with a display screen (1).

Technical Field

The invention belongs to the technical field of instrument and meter detection, and particularly relates to an online detection device of a multifunctional pressure measurement monitoring system.

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 invention provides an online detection device of a multifunctional pressure measurement monitoring system, which is miniaturized, can simultaneously realize online calibration of a pressure sensor and a pressure measurement monitoring system at the later stage, and can simultaneously carry out high-pressure measurement and low-pressure measurement.

The technical scheme adopted by the invention is as follows:

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, the two cylinder bodies are respectively used for storing different media, a left stabilizing seat and a right stabilizing seat which are identical in structure and are in L shape 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;

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 NECT L P620 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 NECT L P620 optocoupler, and the GD32F103C8 control chip is further connected with a display screen.

The invention has the beneficial effects that:

in the on-line detection device, the front-end sensor measurement and calibration device adopts a double-cylinder structure, hydraulic oil is filled in the cylinder at one side, air is filled in the other cylinder, the use of low-pressure measurement and high-pressure measurement can be simultaneously solved by using the same measurement and calibration device, the size of the device is reduced, and the on-line verification of an on-site pressure measurement system becomes possible; the front-end sensor measuring and calibrating device is also provided with the stabilizing seat and the 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 a 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 a post-stage measurement calibration apparatus 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 external structure of the on-line detecting device of the present invention;

reference numeral 1-a display screen, 2 to 5 are pressure output ports, and a to l (lower case form of letter L) are six pairs of electrical 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 invention provides an on-line detection device of a multifunctional pressure measurement monitoring system, in particular to a miniaturized multi-output pressure and electric signal generation device, which solves the problems that the existing detection device cannot carry out on-line calibration on a pressure monitoring and measuring system due to overlarge volume, cannot simultaneously realize the on-line calibration of a pressure sensor and the rear stage of the pressure measurement monitoring system, and cannot simultaneously carry out high-pressure metering and low-pressure metering.

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 34 and the right cylinder 44 are symmetrically arranged on the base 10 in a left-right manner through a fixing ring 50, the two cylinders are cylindrical cavities and are used for storing different media respectively, in the embodiment, the medium in the left cylinder 34 is hydraulic oil, the medium in the right cylinder 44 is air, and the micro-pressure can be generated due to the fact that the compression ratio of the air is larger, and the compression ratio of the hydraulic oil is smaller than that of the air, so that high-pressure metering can be realized.

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.

In the present invention, when the front sensor measurement calibration device is in operation, the media in the left cylinder 34 and the right cylinder 44 are 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 NECT L P620 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, wherein the analog-to-digital conversion circuit is connected with the NECT L P620 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 an NECT L P620 optical coupler as a photoelectric protection measure of the whole circuit.

The controller is characterized in that a NECT L P620 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, level conversion is realized, and the control circuit can be protected from being damaged due to overhigh external voltage.

As the digital-to-analog conversion circuit shown in FIG. 4 needs high precision and low adjustment fineness of direct current in field test, a 1595B chip produced by L TC is selected, the whole circuit can quickly reach a steady state value after analog quantity is output, the response time does not exceed 2 muS, and the 6 th pin and the 7 th pin of a L TC1595B chip are connected with a GD32F103C8 control chip through a NECT L P620 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 R_fxThe current value of (x is 1-5) is I₀Then feedback voltage U_f＝I₀×R_f。

U_fObtaining 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 R_fAfter the determination, the value is a fixed value, and can be known from formula (3): output current I₀And a set voltage V_iIs linear in relation to each other, and V_iIs an output voltage and can be controlled by a host computer. In this example, R is taken₁＝20kΩ，R₂＝10kΩ，R₁₀＝10kΩ，R₁₂100k Ω, if R_fWhen 1 Ω, I can be calculated₀＝100mA。

The on-line detection device of the invention can be integrated into the structural form shown in fig. 6, and 6 pairs of electric signal output ports are arranged above the front surface of the on-line detection device and are used for detecting the back stage of 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 invention has small volume and convenient carrying, is integrated equipment, has both a high-pressure metering function and a low-pressure metering function, can simultaneously carry out online detection on different high-pressure measuring systems and low-pressure measuring systems, can simultaneously realize the full-range calibration of the pressure measurement monitoring system from the front-end sensor to the rear-end display system by the same detection device, and improves the overall measurement calibration precision of the pressure measurement monitoring system.

The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.