CN107817031B - Membrane air spring volume testing system and testing method thereof - Google Patents
Membrane air spring volume testing system and testing method thereof Download PDFInfo
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- CN107817031B CN107817031B CN201711144087.XA CN201711144087A CN107817031B CN 107817031 B CN107817031 B CN 107817031B CN 201711144087 A CN201711144087 A CN 201711144087A CN 107817031 B CN107817031 B CN 107817031B
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- 239000012528 membrane Substances 0.000 title claims abstract description 43
- 238000012360 testing method Methods 0.000 title claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 69
- 239000007788 liquid Substances 0.000 claims abstract description 41
- 238000009864 tensile test Methods 0.000 claims abstract description 37
- 238000000034 method Methods 0.000 claims abstract description 25
- 230000001105 regulatory effect Effects 0.000 claims abstract description 23
- 238000006073 displacement reaction Methods 0.000 claims abstract description 11
- 230000006835 compression Effects 0.000 claims abstract description 10
- 238000007906 compression Methods 0.000 claims abstract description 10
- 239000010985 leather Substances 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 13
- 238000012545 processing Methods 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 9
- 230000003068 static effect Effects 0.000 abstract description 4
- 230000008859 change Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F17/00—Methods or apparatus for determining the capacity of containers or cavities, or the volume of solid bodies
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a membrane air spring volume testing system, which comprises: the system comprises a tensile testing machine, a high-pressure pipeline system, a data acquisition system and a computer, wherein the high-pressure pipeline system comprises a mounting box body, and an air inlet pipe, a pressure regulating valve, a water storage pipe and an air outlet pipe which are sequentially connected and fixed in the mounting box body; the data acquisition system comprises a barometer sensor, a liquid level sensor, a force sensor, a displacement sensor and a data acquisition card connected with the barometer sensor, the liquid level sensor, the force sensor and the displacement sensor through circuits, wherein the computer is in signal connection with the data acquisition card and is used for displaying and outputting data. The invention also discloses a method for testing the volume of the membrane air spring. The invention uses the characteristic of extremely small liquid compression coefficient, adopts the static volume phase difference method to measure the volume of the membrane air spring, has simple operation method, low measurement cost and high accuracy, can measure the volume at a plurality of heights by one clamping, and saves time.
Description
Technical Field
The invention belongs to the field of air spring product parameter measurement, and particularly relates to a membrane air spring volume testing system and method.
Background
In the prior art, the air spring and the water pump are connected into a pipeline to enable the water pump to continuously operate and control the water discharge pressure. Thereby, the pressure inside the air spring is kept dynamically balanced. Then, the change of the weight of the air spring (including the tool) is measured, and the density of water is used for converting the weight into volume, so that the volume of the air spring under the height and the internal pressure of the tool is obtained.
In the measuring method, the water pump needs to work continuously, and the experimental cost is high; dynamic pressure balance and vibration of the water pump have adverse effects on the measurement of weight; in order to measure the weight change of the air spring, the air spring can only be clamped on a tool, and the volume at one height can only be measured at each measurement.
Therefore, it is urgent to develop a convenient measuring mechanism for measuring the volume of the air spring.
Disclosure of Invention
In order to solve the problems, the invention particularly discloses a membrane air spring volume testing system and a testing method thereof, which utilize the characteristic of extremely small liquid compression coefficient and measure the volume of a membrane air spring by adopting a static volume phase difference method. The operation method is simple, the measurement cost is low, the accuracy is high, the volume under a plurality of heights can be measured by one clamping, and the time is saved.
In order to achieve the technical purpose, the invention is realized according to the following technical scheme:
a membrane air spring volume testing system comprising: the system comprises a tensile testing machine, a high-pressure pipeline system, a data acquisition system and a computer, wherein the high-pressure pipeline system comprises a mounting box body, and an air inlet pipe, a pressure regulating valve, a water storage pipe and an air outlet pipe which are sequentially connected and fixed in the mounting box body; the data acquisition system comprises a barometer sensor for measuring the air pressure of the high-pressure pipeline system, a liquid level sensor for measuring a liquid level signal in the water storage pipe, a force sensor for acquiring the bearing capacity of the air spring, a displacement sensor for measuring the displacement of a cross beam of the tensile testing machine, and a data acquisition card connected with the barometer sensor, the liquid level sensor, the force sensor and the displacement sensor through circuits, wherein the computer is in signal connection with the data acquisition card and is used for displaying and outputting data.
Preferably, the high-pressure pipeline system further comprises a barometer connected with the barometer sensor, and the barometer sensor is connected to a pipeline between the pressure regulating valve and the water storage pipe by a three-way connector.
Preferably, the two ends of the water storage pipe are vertically fixed in the mounting box body through the fixing connecting plate and the screw, and are communicated with the liquid level meter.
Preferably, the inner diameter of the water storage pipe is 50-60mm.
Preferably, the tensile testing machine comprises a tensile testing machine base, a tensile testing machine upright post arranged on the tensile testing machine base and a tensile testing machine cross beam which vertically moves up and down along the tensile testing machine upright post, and the force sensor is arranged at the bottom of the tensile testing machine cross beam.
A method of diaphragm air spring volume testing employing the diaphragm air spring volume testing system, comprising the steps of:
1) According to the size of the membrane air spring, measuring a proper volume of V1 water, injecting the water into the membrane air spring, and inputting the V1 value into a test system;
2) The diaphragm air spring is clamped on the tensile testing machine, the high-pressure air source is connected with the air inlet pipe, the air outlet pipe is connected with the air spring air tap, the pressure regulating valve is regulated to enable enough air pressure to exist in the air spring leather bag, the cross beam of the tensile testing machine is controlled to descend, the diaphragm air spring is compressed, the air spring leather bag is forced to be rolled and pressed against the air spring piston, and the air spring leather bag is regulated to the required measuring height;
3) The inner volume of the air spring leather bag is reduced along with the rolling pressure of the air spring leather bag, and after the air in the air spring leather bag is exhausted, water can diffuse into the water storage pipe along the air outlet pipe, and the water level of the air spring leather bag is observed;
4) Regulating the pressure regulating valve, observing the indication of the air pressure display device to ensure that the inflation pressure reaches the required air pressure, and automatically measuring the liquid level height h of the water storage pipe by the liquid level sensor;
5) The computer is used for calculating a fitting formula according to the signals of the liquid level sensor: v2=a×h+b, converting the liquid level height h and the volume V2 of water in the water storage pipe, and calculating the volume of the membrane air spring at a specific height and under air pressure according to the principle of invariable total volume, namely v=v1-v2=v1- (a×h+b), wherein a and b are both constants determined by a calibration process;
6) The tensile testing machine compresses the film air spring at a constant speed until the working stroke of the film air spring is traversed, and the following data are collected and recorded in the experimental process: bearing capacity, compression, air pressure, liquid level height h, air spring volume;
7) And (5) ending the test process, processing the data, and presenting a test result in a curve form.
Preferably, the calibration process specifically includes: measuring two times of water with known volumes V1 and V2, pouring the water into a water storage pipe, respectively recording the liquid level heights h1 and h2, and then measuring the volume V2 = a x h+b of the water in the water storage pipe (15), wherein:
a＝(v1-v2)/(h1-h2)；
b＝v1-h1*(v1-v2)/(h1-h2)。
preferably, in step 2), said sufficient air pressure is in particular an air pressure of 3, 4, 5, 6, 7bar, with the aim of adapting to the existing test standards and requirements of air spring manufacturers.
Preferably, in step 3), the water level is preferably at a position above the middle of the gauge scale, the purpose of which is to reserve space for level changes during subsequent compression and stretching.
Preferably, in step 6), the constant-speed compression rate of the tensile testing machine is 8-10mm/min, and the purpose of slow compression is to enable the air inside the air spring to be in a relatively stable state.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention has the advantages of simple operation method, low requirement on measuring equipment and low measuring cost.
2. In the measuring process, the flowing states of gas and liquid in the membrane air spring are in static stable states, so that accurate measurement is facilitated.
3. The present invention does not require measurement of the overall weight. Due to the combination of the tensile testing machine, the volume of the membrane air spring at a plurality of heights can be measured by one clamping, and the time cost of the experiment is reduced.
Drawings
FIG. 1 is an external view of a diaphragm air spring volume testing system according to the present invention.
Figure 2 is a diagram of the internal layout of a membrane air spring volume testing system according to the present invention.
Figure 3 is a flow chart of the operation of the data acquisition system of a membrane air spring volume testing system according to the present invention.
Fig. 4 is a schematic view of a membrane air spring assembly according to the present invention.
Fig. 5 is a schematic view of the membrane air spring according to the present invention after rolling.
In the figure: 1-an air inlet pipe; 2-a pressure regulating valve; 3-an air pressure display device; 4-a liquid level meter; 5-an air outlet pipe; 6-a column of the tensile testing machine; 7-a cross beam of the tensile testing machine; 8-force sensor; 9-an air spring air tap; 10-an air spring bellows; 11-an air spring piston; 12-a base of the tensile testing machine; 13-a pressure sensor; 14-a three-way connector; 15-a water storage pipe; 16-fixing the connecting plate and the screw; 17-air spring.
Detailed Description
The present invention will be described in further detail with reference to the drawings and specific examples, which are not to be construed as limiting the embodiments of the present invention.
Example 1
As shown in fig. 1-3, a membrane air spring volume testing system comprising: the system comprises a tensile testing machine, a high-pressure pipeline system, a data acquisition system and a computer, wherein the high-pressure pipeline system comprises a mounting box body, and an air inlet pipe 1, a pressure regulating valve 2, a water storage pipe 15 and an air outlet pipe 5 which are sequentially connected and fixed in the mounting box body; the data acquisition system comprises a barometer sensor 13 for measuring the air pressure of the high-pressure pipeline system, a liquid level sensor for measuring a liquid level signal in the water storage pipe, a force sensor 8 for acquiring the bearing capacity of the membrane air spring, a displacement sensor for measuring the displacement of a cross beam of the tensile testing machine, and a data acquisition card connected with the barometer sensor 13, the liquid level sensor, the force sensor and the displacement sensor through circuits, wherein the data acquisition card is provided with a timer and controls the sampling period; the computer is connected with the data acquisition card through signals and is used for displaying and outputting data.
The high-pressure pipeline system also comprises an air pressure display device 3 connected with the air pressure gauge sensor 13, wherein the air pressure gauge sensor 13 is connected to a pipeline between the pressure regulating valve 2 and the water storage pipe 15 by a three-way connector 14, and in the embodiment, the air pressure display device 3 is a liquid crystal display screen.
The two ends of the water storage pipe 15 are vertically fixed in the installation box body through the fixing connecting plates and the screws 16, and are communicated with the liquid level meter 4, and the liquid level meter 4 can be used for observing the liquid level in the water storage pipe 15 in operation.
The inner diameter of the water storage pipe 15 is 50mm, and the volume which can be accommodated is larger because of the larger inner diameter of the water storage pipe 15, so that the test requirements of the membrane air spring under different heights are met.
The tensile testing machine comprises a tensile testing machine base 12, a tensile testing machine upright post 6 arranged on the tensile testing machine base 12 and a tensile testing machine cross beam 7 which vertically moves up and down along the tensile testing machine upright post 6, wherein a force sensor 8 is arranged at the bottom of the tensile testing machine cross beam 7.
Example two
A method of diaphragm air spring volume testing employing the diaphragm air spring volume testing system, comprising the steps of:
1) According to the size of the membrane air spring, measuring a proper volume of V1 water, injecting the water into the membrane air spring, and inputting the V1 value into a test system;
2) The membrane type air spring is clamped on the tensile testing machine, the force sensor 8 is positioned between the cross beam of the tensile testing machine and the membrane type air spring, the high-pressure air source is connected with the air inlet pipe 1, the air outlet pipe 5 is connected with the air spring air tap 9 (see figure 4), the pressure regulating valve 2 is regulated to ensure that enough air pressure exists in the air spring leather bag 10, the cross beam 7 of the tensile testing machine is controlled to descend so as to compress the membrane type air spring, the air spring leather bag 10 is forced to be rolled and pressed against the air spring piston 11, and the required measuring height is regulated;
3) As the air spring bellows 10 is rolled, the inner volume thereof is reduced, and after the air in the bellows is exhausted, water is diffused into the water storage pipe 15 along the air outlet pipe 5, and the water level is observed (see fig. 5);
4) Regulating the pressure regulating valve 2, observing the indication of the air pressure display device 3 to ensure that the inflation pressure reaches the required air pressure, and automatically measuring the liquid level height h of the water storage pipe 4 by the liquid level sensor;
5) The computer is used for calculating a fitting formula according to the signals of the liquid level sensor: v2=a×h+b, converting the liquid level height h and the volume V2 of water in the water storage tube 15, and calculating the volume of the membrane air spring at a specific height and air pressure according to the principle of invariable total volume, namely v=v1-v2=v1- (a×h+b), wherein a and b are both constants determined by a calibration process;
6) The tensile testing machine compresses the film air spring at a constant speed until the working stroke of the film air spring is traversed, and the data of the bearing capacity, the compression amount, the air pressure, the liquid level height h and the air spring volume are collected and recorded in the experimental process and stored in an excel table;
7) And (3) after the test process is finished, processing the data, drawing the data into a characteristic curve and presenting a test result on a computer.
Specifically, the calibration process specifically includes: measuring water of known volumes V1, V2 twice, pouring the water into the water storage tube 15, recording the liquid level heights h1, h2 of the water, and then the volume v2=a×h+b of the water in the water storage tube 15, wherein:
a＝(v1-v2)/(h1-h2)；
b＝v1-h1*(v1-v2)/(h1-h2)。
specifically, in the step 2), the sufficient air pressure is specifically 3, 4, 5, 6, 7bar.
In step 3), the water level is preferably up to the position of the scale of the liquid level meter 4, such as 1/2-2/3 of the scale of the liquid level meter 4.
Specifically, in the step 6), the constant-speed compression speed of the tensile testing machine is 8-10mm/min.
From the above, when the volume of the membrane air spring is measured, the measurement is performed in a static state, and the volume of the membrane air spring is converted by a volume phase difference method by utilizing the characteristic that the liquid compression coefficient is extremely small. The water and air states are stable states, no interference is caused to reading, and the measurement accuracy is high.
The above examples of the present invention are merely illustrative of the present invention and are not intended to limit the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (8)
1. A membrane air spring volume testing system comprising: the system comprises a tensile testing machine, a high-pressure pipeline system, a data acquisition system and a computer, wherein the high-pressure pipeline system comprises a mounting box body, and an air inlet pipe (1), a pressure regulating valve (2), a water storage pipe (15) and an air outlet pipe (5) which are sequentially connected and fixed in the mounting box body; the data acquisition system comprises a barometer sensor (13) for measuring the air pressure of the high-pressure pipeline system, a liquid level sensor for measuring a liquid level signal in the water storage pipe, a force sensor (8) for acquiring the bearing capacity of the air spring, a displacement sensor for measuring the displacement of a cross beam of the tensile testing machine, and a data acquisition card connected with the barometer sensor (13), the liquid level sensor, the force sensor and the displacement sensor through circuits, wherein the computer is in signal connection with the data acquisition card and is used for displaying and outputting data;
the high-pressure pipeline system further comprises an air pressure display device (3) connected with the air pressure meter sensor (13), and the air pressure meter sensor (13) is connected to a pipeline between the pressure regulating valve (2) and the water storage pipe (15) by a three-way connector (14);
the method for testing the volume of the membrane air spring by adopting the testing system comprises the following steps of:
1) According to the size of the membrane air spring, measuring a proper volume of V1 water, injecting the water into the membrane air spring, and inputting the V1 value into a test system;
2) The membrane type air spring is clamped on a tensile testing machine, a high-pressure air source is connected with an air inlet pipe (1), an air outlet pipe (5) is connected with an air spring air tap (9), a pressure regulating valve (2) is regulated to enable enough air pressure to exist in an air spring leather bag (10), a cross beam (7) of the tensile testing machine is controlled to descend so as to compress a membrane type air spring, the air spring leather bag (10) is forced to be rolled and pressed against an air spring piston (11), and the required measuring height is regulated;
3) The inner volume of the air spring leather bag (10) is reduced along with the rolling pressure of the air spring leather bag, and after the air in the air spring leather bag is exhausted, water can diffuse into the water storage pipe (15) along the air outlet pipe (5) to observe the water level of the air spring leather bag;
4) Regulating the pressure regulating valve (2), observing the indication of the air pressure display device (3) to enable the inflation pressure to reach the required air pressure, and automatically measuring the liquid level height h of the water storage pipe (15) by the liquid level sensor;
5) The computer is used for calculating a fitting formula according to the signals of the liquid level sensor: v2=a×h+b, converting the liquid level height h and the volume V2 of water in the water storage tube (15), and calculating the volume of the membrane air spring at a specific height and air pressure according to the principle of invariable total volume, namely v=v1-v2=v1- (a×h+b), wherein a and b are both constants determined by a calibration process;
6) The tensile testing machine compresses the film air spring at a constant speed until the working stroke of the film air spring is traversed, and the following data are collected and recorded in the experimental process: bearing capacity, compression, air pressure, liquid level height h, air spring volume;
7) And (5) ending the test process, processing the data, and presenting a test result in a curve form.
2. The membrane air spring volume testing system according to claim 1, wherein the two ends of the water storage pipe (15) are vertically fixed in the mounting box body through the fixing connection plate and the screw (16) and are communicated with the liquid level meter (4).
3. Membrane air spring volume testing system according to claim 1, characterized in that the inner diameter of the water storage tube (15) is 50-60mm.
4. The membrane air spring volume testing system according to claim 1, wherein said tensile tester comprises a tensile tester base (12), a tensile tester column (6) disposed on said tensile tester base (12), a tensile tester beam (7) vertically moving up and down along said tensile tester column (6), said force sensor (8) being disposed at the bottom of said tensile tester beam (7).
5. The membrane air spring volume testing system according to claim 1, wherein said calibration process comprises: measuring water of known volumes V1, V2 twice, pouring the water into a water storage pipe (15), respectively recording the liquid level heights h1, h2, and then the volume v2=a of the water in the water storage pipe (15) is equal to h+b, wherein:
a＝(v1-v2)/(h1-h2)；
b＝v1-h1*(v1-v2)/(h1-h2)。
6. the membrane air spring volume testing system according to claim 1, wherein in step 2), said sufficient air pressure is specifically 3, 4, 5, 6, 7bar.
7. A membrane air spring volume testing system according to claim 1, wherein in step 3) said water level is brought to a position in the middle of the scale of the gauge (4).
8. The membrane air spring volume testing system of claim 1 wherein in step 6) said tensile tester compresses at a constant rate of 8-10mm/min.
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