阅读说明：本技术 一种旋入式工作级测压器的鉴选方法 (Method for identifying and selecting screw-in working-level voltage meter ) 是由 景春阳 刘宝华 经哲 杜炽旭 张欣欣 张宇峰 刘石 朱建国 张成吉 姜昊 李大鹏 于 2020-12-03 设计创作，主要内容包括：本发明适用于测压器鉴选技术领域,具体是一种旋入式工作级测压器的鉴选方法,包括装配测压器的检测台,而检测台包含有单向进气阀门、放气阀门、测压器和气压表,对检测台上不安装测压器的测压器安装孔中安装用于密封的螺栓；旋紧所有测压器顶部螺栓,记录气压表读数；记录压力值从100kPa降至50kPa的时间,为初始泄压时间；向检测台缓慢充气至压力不低于100kPa,记录活塞杆受压抬起时的瞬时压力值,为抬起压力；记录压力值从100kPa降至50kPa的时间,为泄压时间；以及数据处理,测量结果修正,气密性指数计算,活动性指数计算；实现了对测压器的性能鉴定,解决了动态检测难以开展无法鉴选测压器的难题；通过检测结果合理选择应用的测压器；效率高、经济性好。(The invention is suitable for the technical field of voltage meter identification, in particular to an identification and selection method of a screw-in working-level voltage meter, which comprises a detection platform for assembling the voltage meter, wherein the detection platform comprises a one-way air inlet valve, an air discharge valve, the voltage meter and an air pressure meter, and a bolt for sealing is arranged in a voltage meter mounting hole on the detection platform, on which the voltage meter is not mounted; screwing all the bolts at the top of the pressure gauge, and recording the reading of the barometer; recording the time for reducing the pressure value from 100kPa to 50kPa as the initial pressure relief time; slowly inflating the detection table until the pressure is not lower than 100kPa, and recording the instantaneous pressure value when the piston rod is pressed and lifted as the lifting pressure; recording the time for reducing the pressure value from 100kPa to 50kPa as the pressure relief time; data processing, measurement result correction, airtightness index calculation and activity index calculation; the performance identification of the voltage meter is realized, and the problem that dynamic detection is difficult to carry out and the voltage meter cannot be identified and selected is solved; reasonably selecting an applied voltage meter according to a detection result; high efficiency and good economical efficiency.)

1. The method for identifying and selecting the screw-in working-level pressure gauge is characterized by comprising the following steps of:

1) numbering the pressure gauges to be detected, and respectively measuring the inner diameter D of a piston hole of the pressure gauge, the outer diameter D of a piston rod and the mass m of the piston rod;

2) the pressure gauge is assembled on the detection platform, the detection platform comprises a one-way air inlet valve, an air release valve, a pressure gauge and a pressure gauge, and a bolt for sealing is installed in a pressure gauge installation hole on the detection platform, wherein the pressure gauge is not installed on the pressure gauge;

3) closing the air release valve of the detection platform, screwing all the top bolts of the pressure gauge, and recording the reading p of the barometer at the moment₀(ii) a Inflating the detection table with inflation pressure not lower than 100kPa, observing the pressure value change of the pressure gauge after stopping inflation, and recording the time of the pressure value decreasing from 100kPa to 50kPa as initial pressure relief time t₀(ii) a Opening a deflation valve of the detection platform;

4) closing the air release valve of the detection table, unscrewing a bolt at the top of one of the pressure detectors, and unscrewing to a height h; slowly inflating the detection table until the pressure is not lower than 100kPa, and recording the instantaneous pressure value when the piston rod is pressed and lifted, namely the lifting pressure p_t(ii) a After stopping the inflation, observing the pressure value change of the pressure gauge, recording the time for reducing the pressure value from 100kPa to 50kPa as pressure reliefTime t_x(ii) a Screwing the bolt at the top of the pressure gauge and opening the gas release valve of the detection table;

5) step 4) is carried out on other voltage meters until all the installed voltage meters finish the operation;

6) replacing the pressure gauge in the pressure gauge mounting hole; carrying out the operation in the step 4) on the exchanged voltage measuring device;

7) disassembling the pressure measuring devices, installing the next group of pressure measuring devices, and starting to operate from the step 3); after the pressure detector to be detected is completely detected, the detection table is detached for maintenance;

8) data processing

8.1), correcting the measurement result: correcting the initial reading of the pressure gauge to be not 0; correcting the influence of the installation position of the pressure gauge;

8.2), calculation of airtightness index: when the pressure gauge unscrews the screw rod to lift the piston rod, the pressure relief time can be changed due to the fit clearance between the piston rod and the piston hole, the change of the pressure relief time is related to the pressure acting on the end face of the piston hole, and the air tightness index formula is as follows:

8.3), activity index calculation: when the pressure acting on the end face of the piston rod is greater than the resultant force of the resistance between the piston hole and the piston rod and the gravity of the piston rod, the piston rod can be lifted to start moving, and the activity index formula is as follows:

wherein g is the local gravitational acceleration;

9) selection of voltage meter

The hermeticity index and the activity index together evaluate and select the performance of the pressure gauge.

2. The method of claim 1, wherein the method further comprises selecting a screw-in working-stage voltage detector,

the detection table comprises a detection table main body, and two sealing covers are respectively arranged at two ends of the detection table main body;

a plurality of pressure gauge mounting holes are formed in the detection table main body;

the detection table main body is provided with a barometer mounting hole;

the base is arranged on the detection table main body.

3. The method of claim 2, wherein the step of identifying the screw-in working-stage voltage detector,

the method of assembling the test station of the pressure gauge is as follows:

a one-way air inlet valve is arranged on a sealing cover on one side of the detection table main body and connected with an air charging device, and an air discharging valve is arranged on a sealing cover on the other side of the detection table main body;

installing a base;

installing a group of pressure gauges and air pressure meters, and installing sealing bolts in pressure gauge installation holes without the pressure gauges;

and (4) leveling and detecting the platform.

4. The method of claim 2, wherein the plurality of voltage meter mounting holes comprise hole a, hole B, hole C, and hole D.

5. The method of claim 1, wherein in step 4), the step 4) is repeated a plurality of times, and the measured values are averaged.

6. The method of claim 5, wherein said step 4) is repeated three times to average the measured values.

7. The method for identifying a screw-in working-stage pressure gauge according to claim 1, wherein in step 8.1) of step 8), the effect of the installation position of the corrected pressure gauge in the correction of the measurement result is a corrected uplifted pressure, and the linear fitting correction is performed according to the test result after the pressure gauge is replaced; the pressure relief time test result after the voltage detector is exchanged is only used for analyzing the difference between holes and is not corrected.

8. The method of claim 1, wherein the pressure gauge comprises a screw, a pressure gauge body and a piston, wherein a pressure measuring copper column is arranged between the piston and a piston platform on which the piston is mounted, and the pressure measuring copper column is compressed by the screw.

Technical Field

The invention belongs to the technical field of voltage meter identification, and particularly relates to an identification and selection method of a screw-in working-level voltage meter.

Background

The pressure gauge is an important component of a copper column pressure measuring system, wherein the screw-in type pressure gauge is mainly used for measuring the maximum bore pressure of various firearms, the end part of the body is provided with a thread and a conical surface, the thread is screwed into the pressure measuring hole, and the conical surface is used for ensuring sealing. The piston is used for transferring the gas pressure of gunpowder, can freely slide in the piston hole of the body and can ensure that no gas leakage occurs.

At present, dynamic detection is mainly used for identifying and selecting voltage meters at home and abroad, low-grade voltage meters are detected through high-grade voltage meters, standard copper columns with good deformation consistency are adopted for magnitude transmission, classification and identification of screw-in voltage meters are usually carried out on special ballistic guns, the detection process is complicated, and the identification and selection can be realized only by acquiring a large amount of data through multiple experiments. For the most common working-grade voltage measuring devices, due to frequent application and large quantity, the workload of adopting the identification and selection method is huge, and a large amount of expensive standard copper columns are consumed, so that the method is difficult to develop in practical application.

Disclosure of Invention

The present invention is directed to a method for identifying a screw-in working stage voltage detector, so as to solve the above problems in the background art. In order to achieve the purpose, the invention provides the following technical scheme:

a method for identifying and selecting a screw-in working-level voltage meter comprises the following steps:

1) numbering the pressure gauges to be detected, and respectively measuring the inner diameter D of a piston hole of the pressure gauge, the outer diameter D of a piston rod and the mass m of the piston rod;

2) the pressure gauge is assembled on the detection platform, the detection platform comprises a one-way air inlet valve, an air release valve, a pressure gauge and a pressure gauge, and a bolt for sealing is installed in a pressure gauge installation hole on the detection platform, wherein the pressure gauge is not installed on the pressure gauge;

3) closing the air release valve of the detection platform, screwing all the top bolts of the pressure gauge, and recording the reading p of the barometer at the moment₀(ii) a Inflating the detection table with inflation pressure not lower than 100kPa, observing the pressure value change of the pressure gauge after stopping inflation, and recording the time of the pressure value decreasing from 100kPa to 50kPa as initial pressure relief time t₀(ii) a Opening a deflation valve of the detection platform;

4) closing the air release valve of the detection table, unscrewing a bolt at the top of one of the pressure detectors, and unscrewing to a height h; slowly inflating the detection table until the pressure is not lower than 100kPa, and recording the instantaneous pressure value when the piston rod is pressed and lifted, namely the lifting pressure p_t(ii) a After the inflation is stopped, observing the pressure value change of the pressure gauge, and recording the time for reducing the pressure value from 100kPa to 50kPa as the pressure relief time t_x(ii) a Screwing the bolt at the top of the pressure gauge and opening the gas release valve of the detection table;

5) step 4) is carried out on other voltage meters until all the installed voltage meters finish the operation;

6) replacing the pressure gauge in the pressure gauge mounting hole; carrying out the operation in the step 4) on the exchanged voltage measuring device;

7) disassembling the pressure measuring devices, installing the next group of pressure measuring devices, and starting to operate from the step 3); after the pressure detector to be detected is completely detected, the detection table is detached for maintenance;

8) data processing

8.1), correcting the measurement result: correcting the initial reading of the pressure gauge to be not 0; correcting the influence of the installation position of the pressure gauge;

8.2), calculation of airtightness index: when the pressure gauge unscrews the screw rod to lift the piston rod, the pressure relief time can be changed due to the fit clearance between the piston rod and the piston hole, the change of the pressure relief time is related to the pressure acting on the end face of the piston hole, and the air tightness index formula is as follows:

the smaller the air tightness index is, the better the air tightness performance of the pressure gauge is;

8.3), activity index calculation: when the pressure acting on the end face of the piston rod is greater than the resultant force of the resistance between the piston hole and the piston rod and the gravity of the piston rod, the piston rod can be lifted to start moving, and the activity index formula is as follows:

wherein g is the local gravitational acceleration; the smaller the activity index is, the better the activity performance of the voltage meter is;

9) selection of voltage meter

The airtightness index and the activity index jointly evaluate and select the performance of the pressure gauge, and when the airtightness index and the activity index are smaller, the performance of the pressure gauge is proved to be better; the air tightness and the activity of the pressure gauge are in negative correlation, namely the air tightness is good, the activity is poor, the activity is good, and the air tightness is poor; therefore, during selection, the air tightness or the activity can be emphasized according to different use scenes; when the castor oil pressure sensor is applied to an oil cylinder, castor oil is used as a pressure transmission medium, so that the influence of air tightness on the castor oil pressure sensor is small, viscous resistance is increased, the influence of activity is large, and a pressure detector with good activity is selected; when the pressure-transmitting medium is gunpowder gas when the pressure-transmitting medium is applied to a ballistic gun, the influence of air tightness is large, the influence of activity is small, and a pressure measuring device with good air tightness is selected.

The further scheme of the invention is as follows: the detection table comprises a detection table main body, and two sealing covers are respectively arranged at two ends of the detection table main body;

a plurality of pressure gauge mounting holes are formed in the detection table main body;

the detection table main body is provided with a barometer mounting hole;

the base is arranged on the detection table main body.

Further scheme: the method of assembling the test station of the pressure gauge is as follows:

a one-way air inlet valve is arranged on a sealing cover on one side of the detection table main body and connected with an air charging device, and an air discharging valve is arranged on a sealing cover on the other side of the detection table main body;

installing a base;

installing a group of pressure gauges and air pressure meters, and installing sealing bolts in pressure gauge installation holes without the pressure gauges;

and (4) leveling and detecting the platform.

Optimizing: the plurality of pressure gauge mounting holes include a hole a, a hole B, a hole C, and a hole D.

The further scheme of the invention is as follows: in the step 4), the step 4) is repeated for a plurality of times, and the average value of the measured values is taken.

Optimizing: repeating the step 4) for three times, and averaging the measured values.

The further scheme of the invention is as follows: step 8.1) in the step 8), the influence of the corrected pressure gauge mounting position in the correction of the measurement result is corrected uplift pressure, and linear fitting correction is performed according to the test result after the pressure gauge is replaced; the pressure relief time test result after the voltage detector is exchanged is only used for analyzing the difference between holes and is not corrected.

The further scheme of the invention is as follows: the pressure measuring device comprises a screw, a pressure measuring device body and a piston, a pressure measuring copper column is arranged between the piston and a piston platform on which the piston is arranged, and the pressure measuring copper column is compressed through the screw.

Compared with the prior art, the screw-in working-level voltage meter identifying method disclosed by the invention realizes the performance identification of the voltage meter and solves the problem that dynamic detection is difficult to implement and the voltage meter cannot be identified; reasonably selecting an applied voltage meter according to a detection result; high efficiency and good economical efficiency.

Drawings

FIG. 1 is a schematic diagram of a detection table structure in the method for identifying a screw-in working-stage voltage detector according to the present invention.

Fig. 2 is a schematic structural diagram of the pressure detector.

In the figure: 1-sealing cover; 2-a pressure measuring device mounting hole; 3-mounting holes of the barometer; 4-a base; 5-a screw; 6-pressure measuring device body; 7-a piston; 8-pressure measuring copper column.

Detailed Description

The technical solution of the present invention will be described in further detail with reference to specific embodiments.

In an embodiment of the present invention, as shown in fig. 1 and fig. 2, a method for identifying a screw-in working-stage voltage meter includes the following steps:

1) numbering the pressure gauges to be detected, and respectively measuring the inner diameter D of a piston hole of the pressure gauge, the outer diameter D of a piston rod and the mass m of the piston rod; wherein, treat that the depressor carries out the serial number 1#, 2#, 3#, 4#, measures 4 pressure meter piston bore internal diameter D, piston rod external diameter D respectively, and piston rod quality m, as shown in table 1 (the pressure meter measuring result of waiting to examine):

TABLE 1

Numbering of pressure gauges	D/mm	d/mm	m/g
				1#	5.114	5.044	7.118
2#	5.133	5.045	7.168
				3#	5.191	5.047	7.196
4#	5.125	5.045	7.167

2) The pressure meter detection device comprises a detection platform for assembling a pressure meter, wherein the detection platform comprises a one-way air inlet valve, an air discharge valve, the pressure meter and a pressure meter, and a bolt for sealing is installed in a pressure meter installation hole 2 on the detection platform, in which the pressure meter is not installed;

specifically, the detection table comprises a detection table main body, and two sealing covers 1 are respectively arranged at two ends of the detection table main body; a plurality of pressure gauge mounting holes 2 are formed in the detection table main body; the detection table main body is provided with a barometer mounting hole 3, and a base 4 is arranged on the detection table main body. The pressure measuring device mounting hole 2 comprises a hole A, a hole B, a hole C and a hole D.

The method of assembling the test station of the pressure gauge is as follows: a one-way air inlet valve is arranged on a sealing cover 1 on one side of the detection table main body and connected with an inflating device, and an air outlet valve is arranged on a sealing cover 1 on the other side; a mounting base 4; installing a group of pressure gauges and air pressure meters, and installing sealing bolts on the pressure gauge installation holes 2 without the pressure gauges; and (4) leveling and detecting the platform.

3) Closing the air release valve of the detection platform, screwing all the top bolts of the pressure gauge, and recording the reading p of the barometer at the moment₀(ii) a Inflating the detection table with inflation pressure not lower than 100kPa, observing the pressure value change of the pressure gauge after stopping inflation, and recording the time of the pressure value decreasing from 100kPa to 50kPa as initial pressure relief time t₀(ii) a Opening a deflation valve of the detection platform;

4) closing the air release valve of the detection table, unscrewing a bolt at the top of one of the pressure detectors, and unscrewing to a height h; slowly inflating the detection table until the pressure is not lower than 100kPa, and recording the instantaneous pressure value when the piston rod is pressed and lifted, namely the lifting pressure p_t(ii) a After the inflation is stopped, observing the pressure value change of the pressure gauge, and recording the time for reducing the pressure value from 100kPa to 50kPa as the pressure relief time t_x(ii) a Screwing the bolt at the top of the pressure gauge and opening the gas release valve of the detection table;

5) step 4) is carried out on other voltage meters until all the installed voltage meters finish the operation;

6) replacing the pressure gauge in the pressure gauge mounting hole; carrying out the operation in the step 4) on the exchanged voltage measuring device;

in step 5), repeating the operation in step 4) for 2#, 3#, and 4#, exchanging the 3# pressure detector in the hole A and the 1# pressure detector in the hole D in step 6), and repeating the operation in step 4) for the 1# pressure detector in the hole A and the 3# pressure detector in the hole D after exchanging; the data are reported in table 2 (test station measurements):

TABLE 2

7) Disassembling the pressure measuring devices, installing the next group of pressure measuring devices, and starting to operate from the step 3); after the pressure detector to be detected is completely detected, the detection table is detached for maintenance;

8) and data processing: 8.1), correcting the measurement result: correcting the initial reading of the pressure gauge to be not 0; correcting the influence of the installation position of the pressure gauge; 8.2), calculation of airtightness index: when the pressure gauge unscrews the screw rod to lift the piston rod, the pressure relief time can be changed due to the fit clearance between the piston rod and the piston hole, the change of the pressure relief time is related to the pressure acting on the end face of the piston hole, and the air tightness index formula is as follows:

the smaller the air tightness index is, the better the air tightness performance of the pressure gauge is;

8.3), activity index calculation: when the pressure acting on the end face of the piston rod is greater than the resultant force of the resistance between the piston hole and the piston rod and the gravity of the piston rod, the piston rod can be lifted to start moving, and the activity index formula is as follows:

wherein g is the local gravitational acceleration; the smaller the activity index is, the better the activity performance of the voltage meter is;

specifically, in the step 8), data processing is carried out, and the initial reading of the pressure gauge is subtracted from the data of the uplift pressure value by 7.5 kPa. According to the measurement results after the exchange: the pressure measurement device is changed from the hole A to the hole D, the lifting pressure is reduced by 5kPa, the pressure measurement device is changed from the hole D to the hole A, the lifting pressure is increased by 5kPa, the lifting pressure from the hole D to the hole A is increased by 5kPa on average, the hole D is corrected to 0, and the hole C is corrected by 1.7kPa, the hole B is corrected by 3.3kPa, and the hole A is corrected by 5kPa through linear fitting calculation.

The calculation of the airtightness index and the activity index from the corrected uplift pressure values are shown in Table 3

TABLE 3

Numbering of pressure gauges	Lifting pressure/kPa	Index of air tightness	Index of activity
				1#	22.50	2.3160	5.4421
2#	35.80	1.3451	9.1839
				3#	37.50	1.2276	9.6331
4#	44.20	1.0872	11.5752

9) Selection of voltage meter

The airtightness index and the activity index jointly evaluate and select the performance of the pressure gauge, and when the airtightness index and the activity index are smaller, the performance of the pressure gauge is proved to be better; the air tightness and the activity of the pressure gauge are in negative correlation, namely the air tightness is good, the activity is poor, the activity is good, and the air tightness is poor; therefore, during selection, the air tightness or the activity can be emphasized according to different use scenes; when the castor oil pressure sensor is applied to an oil cylinder, castor oil is used as a pressure transmission medium, so that the influence of air tightness on the castor oil pressure sensor is small, viscous resistance is increased, the influence of activity is large, and a pressure detector with good activity is selected; when the pressure-transmitting medium is gunpowder gas when the pressure-transmitting medium is applied to a ballistic gun, the influence of air tightness is large, the influence of activity is small, and a pressure measuring device with good air tightness is selected.

In the step 9), the pressure gauges are selected, and the pressure gauges have the performance of 4#, 3#, 2#, and 1# from good to bad according to the air tightness sequence. The performance of the voltage meter is 1#, 2#, 3#, 4# from excellent to poor according to the sequence of activity; the comprehensive activity and the air tightness are selected, and the performance of the pressure measuring device is 1#, 2#, 3#, and 4# from excellent to poor.

And (4) verifying the evaluation result: the 1# pressure gauge and the 2# pressure gauge are installed on the oil cylinder to carry out a dynamic detection experiment (the specific implementation process is irrelevant to the application and is the prior art, and the detailed description is omitted here), and 5 groups of experimental data are obtained and are shown in table 4 (verification of oil cylinder experiment):

TABLE 4

The activity in the oil cylinder experiment is a main factor influencing the performance of the pressure measuring device, the pressure measuring value of the 1# pressure measuring device is generally higher than that of the 2# pressure measuring device and is consistent with the activity index, and the pressure measuring device identifying and selecting method is proved to be correct.

The screw-in working-level voltage meter identifying and selecting method realizes the performance identification of the voltage meter and solves the problem that dynamic detection is difficult to carry out and the voltage meter cannot be identified and selected; reasonably selecting an applied voltage meter according to a detection result; high efficiency and good economical efficiency.

In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

While the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.