JP3956540B2 - Pressure vessel inspection machine and inspection method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pressure vessel inspection machine and an inspection method thereof. In particular, the present invention relates to an inspection machine and an inspection method for inspecting whether there is no defective product such as a scratch on the flexible membrane that partitions the vacant chamber of the pressure vessel, or whether the flexible membrane is attached normally.
[0002]
[Prior art]
Japanese Patent Laid-Open No. 7-139501 exists in the prior art relating to the present invention.
In this publication, an inspection machine 60 shown in FIG. 9 is shown. The inspection machine 60 shown in FIG. 9 illustrates the main part.
[0003]
In FIG. 9, 50 is an accumulator which belongs to a pressure vessel. As shown in FIG. 10, in the pressure vessel 50, an empty chamber 52 of the shell 51 is partitioned into a gas chamber 54 and a working fluid chamber 55 by a bladder 56. An oil port 53 is provided in the working fluid chamber 55 of the shell 51. The bladder 56 is made of rubber or a resin material to form a hemispherical shape, and an opening peripheral edge 57 is in close contact with the inner peripheral surface of the shell 51 by a holding metal fitting 58. The gas chamber 54 is filled with nitrogen gas at a set pressure.
[0004]
The working fluid chamber 55 is provided with a pipe 62 so that oil can be supplied from a supply source 61 shown in FIG. The pipe 62 is provided with a branched second pipe 63, and the second pipe 63 is provided with a discharge valve 65 capable of releasing oil from the working fluid chamber 55. Further, the piping 62 is provided with a shutoff valve 66 for opening and closing the supply of oil to the working fluid chamber 55. The pipe 62 is provided with a pressure gauge 67 for measuring the pressure of the operating oil.
[0005]
Further, a third pipe 64 branched from the pipe 62 is provided with a pressure sensor 68 for measuring the pressure of the working fluid chamber 55, and a connected recorder 69 is provided for the pressure sensor 68. The recorder 69 records changes in data from the pressure sensor 68. In FIG. 11, there is a conventional technique in which a personal computer 70 is connected instead of the recorder 69 as a technique of the inspection machine 60 </ b> A that improves the defect of the recorder 69. In this inspection machine 60A, the personal computer 70 differentiates the pressure data from the pressure sensor 68 twice to clarify the inflection point of the pressure line as a pulse waveform.
[0006]
9 configured as described above supplies the working oil from the supply source 61 to the working fluid chamber 55 by opening the shielding valve 66 after the accumulator 50 is set. The supplied working oil inverts the bladder 56 while increasing the pressure in the working fluid chamber 55 to compress the gas chamber 54. After the gas chamber 54 is compressed, the release valve 67 is opened to open the atmosphere. At this time, the pressure of the working oil changes along the pressure diagram.
[0007]
FIG. 12 shows this pressure diagram. In this pressure diagram, data from the pressure sensor 68 is created via a recorder 69. The point at which the pressure in the working fluid chamber 55 becomes the same as the pressure in the gas chamber 54 is recorded as an inflection point A in the pressure diagram. P ₁ Is the pressure in the gas chamber and P ₂ Is the pressure of the working fluid chamber 55.
[0008]
Further, another inspection machine 60A improved from the above-described inspection machine 60 operates in the same manner as described above. However, the difference from the above is that the personal computer 70 differentiates the data from the pressure sensor 68 twice to obtain the inflection point A instead of recording in the recorder 69. When the operating pressure data from the pressure sensor 68 is continuously differentiated twice, the pressure diagram becomes a pulse waveform B, and a part of the diagram protrudes, and the pulse waveform falls to zero. This point is regarded as the inflection point A. This relationship is as shown in FIG.
[0009]
[Problems to be solved by the invention]
However, since the pressure diagram measured by the inspection machine 60 is displayed by the recorder 69, there is a problem that it is not displayed accurately. Further, since the inflection point A is not clearly displayed, it is difficult to read. For this reason, it cannot be expected that the function or defect of the bladder 56 is read from the pressure diagram. Further, it is difficult to determine whether the bladder 56 is attached or not from the pressure diagram.
Furthermore, there is a problem of an error in the pressure value due to the temperature accompanying the compression of the working fluid and the gas, and it is difficult to accurately determine the pressure diagram unless the pressure value is corrected by the temperature.
[0010]
In addition, in the improved inspection machine 60A described above, the inflection point can be obtained. However, since the pulse waveform B corresponding to the pressure diagram as shown in FIG. Difficult to read. Furthermore, it is difficult to determine whether the bladder 56 is attached or not. Moreover, since it calculates | requires with a pulse waveform, there exists a problem that the cost of an inspection machine becomes expensive.
Furthermore, there is a problem of an error in the pressure value due to the temperature accompanying the compression of the working fluid and the gas, and it is difficult to accurately determine the pressure diagram unless the pressure value is corrected by the temperature.
[0011]
The present invention has been made in view of the above-mentioned problems, and the technical problem is that a low-cost pressure vessel inspection machine can accurately determine the function of the flexible film of the pressure vessel and the quality of defects. Is to make it. Furthermore, it is possible to determine whether or not the attachment state of the flexible film is normal. Another object of the present invention is to obtain an accurate pressure diagram by minimizing pressure error due to temperature, and to accurately determine the function of the flexible membrane and the availability of the attached state from the pressure diagram.
Furthermore, it is intended to make it possible to easily determine whether the flexible membrane is good and whether it is attached or not with a low-cost inspection method.
[0012]
[Means for Solving the Problems]
The present invention has been made to solve the above-described problems, and technical means thereof are configured as follows.
[0013]
A pressure vessel inspection machine according to a first aspect of the present invention includes a flexible membrane which has an empty chamber (42) therein and partitions the empty chamber (42) into a gas chamber (44) and a working fluid chamber (45). (43) a pressure vessel inspection machine having an on-off valve (5) in a pipe for supplying a working fluid to the working fluid chamber (45) and a pressure in the working fluid chamber (45). A pressure sensor (8), a release valve (7) for discharging the working fluid supplied to the working fluid chamber (45), and a computer (10) for inputting and processing pressure data of the pressure sensor (8). The computer (10) includes a first pressure diagram (P1) of a pressure that greatly compresses the gas chamber (44) according to pressure data of the working fluid chamber (45) with respect to a pressure of the gas chamber (44); The gas chamber (P1) than the first pressure diagram (P1) 4) Each inflection point (A) between the first pressure diagram (P1) and the second pressure diagram (P2) is calculated by processing the second pressure diagram (P2) that compresses 4). The quality of the flexible membrane (43) is judged by comparing the similarity of the pressure line including the non-similarity.
[0014]
According to a second aspect of the present invention, there is provided a pressure membrane inspection apparatus having a vacant chamber (42) therein and partitioning the vacant chamber (42) into a gas chamber (44) and a working fluid chamber (45). (43) a pressure vessel inspection machine having an on-off valve (5) in a pipe for supplying a working fluid to the working fluid chamber (45) and a pressure in the working fluid chamber (45). A pressure sensor (8), a temperature sensor (9) for detecting the temperature of the pressure vessel (40), an open valve (7) for discharging the working fluid supplied to the working fluid chamber (45), and the pressure A computer (10) for inputting and processing pressure data from a sensor (8) and temperature data from the temperature sensor (9), wherein the computer (10) operates on the pressure of the gas chamber (44); Pressure changing with temperature of fluid chamber (45) The data is corrected by the temperature data from the temperature sensor (9), the first pressure diagram (P1) and the second pressure diagram (P2) are arithmetically processed, and the first pressure diagram (P1) And the second pressure diagram (P2), the similarity of the pressure line including each inflection point (A) is compared with the similarity, and the quality of the flexible membrane (43) is determined.
[0015]
According to a third aspect of the present invention, the computer (10) obtains a plurality of the second pressure diagrams (P2) and finally calculates the second pressure diagram (P2). The inflection point (A) and the inflection point (A) of the first pressure diagram are compared with each other.
[0016]
According to the pressure vessel inspection method of the present invention according to claim 4, a pressure vessel (40) in which an empty chamber is partitioned into a gas chamber (44) and a working fluid chamber (45) by a flexible membrane (43) is attached, The on-off valve (5) is opened into the working fluid chamber (45) of the pressure vessel (40) to flow in the working fluid to compress the gas chamber (44), and the open valve (7) is opened to open the working fluid chamber. (45) the first stroke of releasing the working fluid to the atmosphere, and further opening the on-off valve (5) into the working fluid chamber (45) to allow the working fluid less than the first stroke to flow into the gas chamber (44). ) And opening the release valve (7) to release the working fluid one or more times, and the pressure relative to the pressure of the gas chamber (44) in the first and second strokes. The pressure data of the working fluid chamber (45) is detected by the pressure sensor (8). The first pressure diagram (P1) is calculated from the pressure data of the first stroke from the computer (10) and the second pressure line is calculated from the pressure data of the second stroke. The calculation is performed on the diagram (P2), and the above-mentioned possibility is obtained from the comparison between the similarity of the inflection points (A) and the similarity of the first pressure diagram (P1) and the second pressure diagram (P2). The quality of the flexure film (43) is determined.
[0017]
In the pressure vessel inspection method according to claim 5, temperature data of the pressure vessel (40) is detected by a temperature sensor (9), and the computer (10) inputs the temperature data and uses the temperature data to generate a pressure line. The figure is the one according to claim 4 in which an error that varies with temperature is corrected.
[0018]
[Action]
Next, the operation of the inspection machine of the present invention will be described.
The pressure vessel inspection machine according to the first aspect of the present invention attaches the pressure vessel to the inspection device, opens the on-off valve, and supplies the working fluid from the supply source to the working fluid chamber of the pressure vessel. As the pressure of the supplied working fluid increases, the gas chamber is compressed, and a point where the pressure of the gas chamber and the pressure of the working fluid chamber are balanced becomes an inflection point. When the working fluid is further supplied to the working fluid chamber, the working fluid chamber is compressed to the maximum capacity of the function of the pressure vessel. When the maximum capacity of the working fluid chamber is reached, the discharge valve is opened to discharge until the pressure of the working fluid in the working fluid chamber becomes zero. The first pressure diagram in the first stroke operation is created by inputting data from the pressure sensor to the computer every moment.
[0019]
Next, as in the second stroke operation, the open / close valve is opened in the same manner as described above, the working fluid is caused to flow into the working fluid chamber, and the gas chamber is compressed by supplying the working fluid slightly upward where the inflection point appears. At a time above the inflection point, the discharge valve is opened to discharge the working fluid in the working fluid chamber. This second stroke work is repeated a plurality of times according to the setting, and the attachment state of the flexible membrane is determined by the similarity of each inflection point. At the same time, the inflection point and the compression point of the maximum capacity are read from the first pressure diagram that reaches the maximum capacity of the flexible film, and the quality and quality of the flexible film are determined. These pressure diagrams are created by inputting pressure data from the pressure sensor into a computer and performing arithmetic processing.
[0020]
The determination of pass / fail from the pressure diagram relating to the flexible membrane is easy when the pressure line including the inflection point of each pressure diagram resembles almost the same shape and is processed by a computer to be normal. It becomes possible to judge. Alternatively, the quality can be determined by comparing with the pressure data input to the setting device of the computer. Specifically, it is possible to determine whether or not the flexible membrane is defective based on the maximum compression point of the first pressure diagram and whether or not the function is normal based on the inflection point. If there is an abnormality in the flexible membrane, this determination can be easily made because the maximum capacity pressure diagram is different from the input maximum pressure diagram.
[0021]
The pressure vessel inspection machine of the present invention according to claim 2 corrects errors in the pressure diagram due to the compression of the gas in the gas chamber and the change in temperature at which the working fluid generates heat during operation with the data from the temperature sensor. is there. This correction is calculated by a predetermined formula inputted by inputting data from the temperature sensor into the computer.
[0022]
In the pressure vessel inspection method of the present invention according to claim 4, the pressure vessel is attached to the inspection machine, and the on-off valve is opened to allow the working fluid to flow into the working fluid chamber of the pressure vessel. Then, when the gas chamber reaches the maximum compression, the discharge valve is opened and discharged until the pressure of the working fluid chamber reaches atmospheric pressure. At this time, the behavior of the pressure state in which the gas chamber is compressed is created by inputting the pressure data from the pressure sensor into the computer every time and performing arithmetic processing, thereby creating a first pressure diagram.
[0023]
Next, as a second stroke, the discharge valve is closed and the on-off valve is opened to allow the working fluid to flow into the working fluid chamber to supply an inflection point where the pressure is almost the same as the pressure in the gas chamber. Then, when the inflection point is confirmed, the discharge valve is opened and the atmosphere is opened. These pressure behaviors are created as a second pressure diagram having an inflection point by inputting pressure data from the pressure sensor to a computer.
[0024]
Further, a plurality of second pressure diagrams having inflection points are created by repeating the second step in accordance with a request for accuracy. These second pressure diagrams are created when the pressure sensor detects the pressure behavior of the working fluid chamber and inputs it to the computer. In these pressure diagrams, the quality of the flexible membrane is determined by comparing each inflection point. Further, the pressure data is corrected by the temperature data from the temperature sensor, whereby a more detailed pressure diagram can be obtained. This corresponds to the fifth aspect.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments according to the present invention will be described in detail below with reference to the drawings of a pressure vessel inspection machine and inspection method.
[0026]
FIG. 1 is a view showing a main part of a pressure vessel inspection machine showing an embodiment according to the present invention. Reference numeral 40 denotes a pressure vessel attached to the inspection machine 1.
[0027]
First, the pressure vessel 40 as a product to be tested will be described. The pressure vessel 40 in FIG. 2 is a cross-sectional view showing the accumulator used as an example, and is attached to the inspection machine 1 and tested.
[0028]
In the pressure vessel 40 of FIG. 2, 41 indicates a shell. The inside of the shell 41 is formed in a vacant chamber 42. The empty chamber 42 is divided into a gas chamber 44 and a working fluid chamber 45 by a flexible film 43. The flexible film 43 is made of rubber or a resin material, and is fixed to the inner peripheral surface of the empty chamber 42 by a holding metal fitting 46. In addition to this, the flexible film 43 can also be composed of a metal stay such as a superelastic alloy material. The working fluid chamber 45 is provided with an inflow port 47. The gas chamber 44 is filled with nitrogen gas having a set pressure, and the working fluid chamber 45 can be supplied with working fluid from the inflow port 47.
[0029]
In the pressure vessel 40 shown in FIG. 2, the working fluid is supplied from the inflow port 47, the gas chamber 44 is compressed, and the pressure container 40 is compressed above the inflection point A where the pressures of the gas chamber 44 and the inflow port 47 are balanced. State. That is, it is close to the maximum pressure in the second pressure diagram.
This pressure vessel 40 is provided in a device that absorbs the pulsation and pressure of the working fluid via the bladder that is the flexible membrane 43, and whether or not the flexible membrane 43 is normally attached is a gas. It is necessary to confirm defects such as whether or not the gas in the chamber 44 does not leak, quality, durability, operation function, and the like.
[0030]
FIG. 1 shows a pressure vessel inspection machine 1 according to the present invention. In FIG. 1, the pressure vessel 40 shown in FIG. 2 is connected to and attached to the supply port of the pipe 2 in the inspection machine 1. The pipe 2 is provided with a pressure gauge 4 and an opening / closing valve 5 in order from the supply source 3. The on-off valve 5 is opened to supply the working fluid from the supply source 3 to the working fluid chamber 45 and is closed when the working fluid in the working fluid chamber 45 is opened to the atmosphere. A first branch pipe 6A is provided between the on-off valve 5 and the supply port. The first branch pipe 6A is provided with an opening valve 7. The opening / closing valve 5 is closed, and the opening of the opening valve 7 allows the working fluid in the working fluid chamber 45 to be opened to the atmosphere. Become.
[0031]
Further, a pressure sensor 8 is provided in the second branch pipe 6 </ b> B communicating with the working fluid chamber 45. The pressure sensor 8 detects pressure data in the working fluid chamber 45 or pressure data in the gas chamber 44. The data is input to the computer 10. The pressure sensor 8 may be a digital pressure gauge in terms of cost, but other pressure gauges are converted into digital signals by the computer 10 and used.
[0032]
Furthermore, in a second embodiment to be described later, a temperature sensor 9 for measuring temperature data in the shell 41 is provided. Data detected by the temperature sensor 9 can be input to the computer 10. Although the digital temperature sensor 9 is adopted as the temperature sensor 9, most of the current temperature sensors 9 can be used. For example, platinum resistance thermometer, thermocouple, thermal ferrite, TiO3 ceramic, transistor, etc.
[0033]
The inspection machine 1 is provided with a computer 10 that inputs the pressure data detected by the pressure sensor 8 and performs arithmetic processing. The computer 10 also includes a control unit 30 that controls the opening / closing operation of the opening / closing valve 5 and the opening valve 7 and the set pressure of the pressure gauge 4 simultaneously with the arithmetic processing. Further, the computer 10 can connect a personal computer and a programmable controller (PC), perform arithmetic processing by the personal computer, and control the control unit 30 of the inspection machine 1 by the PC.
[0034]
FIG. 3 shows the processing unit 24 of the computer 10 as a configuration. In FIG. 3, the computer 10 includes an arithmetic processing unit (CPU) 240 that performs arithmetic processing on pressure data from the pressure sensor 8, an attached memory 242, an A / DC converter, an I / O device 246, and a D / D An AC converter 243 and a setting unit 25 are included. The analog pressure signal input from 1 / F 22 via the pressure sensor 8 is converted into a digital pressure signal by the A / DC 244. The arithmetic processing unit (CPU) 240 calculates the pressure signal to create a pressure diagram, and operates the control program stored in the memory 242 to activate the control unit 30 that drives the on-off valve 5 and the like. . Therefore, the drive signal is output to the I / F 21 via the D / AC converter 243 to the digital on-off valve 5 or the like.
[0035]
The arithmetic processing unit (CPU) 240 performs arithmetic processing on the pressure data input from the pressure sensor 8 to create a first pressure diagram P1 and a second pressure diagram P2. Then, the quality of the flexible film 43 is determined by comparing the pressure lines centered on the inflection points A. As another method, a predetermined set pressure for checking the performance of the pressure vessel 40 previously input is input from the setter 25 via the I / O 246, and the stored set pressure data and I The quality of the pressure diagram can be determined by comparing with the data of the pressure signal from / F22. These determinations are based on the quality of defects such as defects in the flexible film 43 according to the first pressure diagram P1, and the quality of the enclosed pressure value in the gas chamber 44 by comparing each inflection point A in the first pressure diagram P2. In addition, it determines whether the mounting state is normal or abnormal. This comparative example will be described later.
[0036]
FIG. 4 shows a pressure vessel inspection machine 1 showing a second embodiment according to the present invention. 4 is different from FIG. 1 in that a temperature sensor 9 for measuring the operating temperature in the shell 41 is provided. The temperature sensor 9 is as described above, and the temperature data obtained by the temperature sensor 9 is input to the computer 10 to correct the pressure value that varies depending on the temperature. The second pressure diagram including the point A can be obtained accurately. For this reason, the determination of the quality of the flexible film 43 of the pressure vessel 40 and the determination of the attachment state become more accurate.
[0037]
FIG. 5 shows a configuration of a main part of the computer 10 in the inspection machine 1 of FIG.
The difference from FIG. 3 is that the temperature data from the temperature sensor 9 is converted into a digital temperature signal by the A / DC converter 244 as an analog temperature signal input from the interface circuit I / F 23, and the arithmetic processing is performed. Input to the CPU (CPU) 240. And since the change of the pressure value accompanying temperature is correct | amended by the signal as this temperature, a more exact pressure diagram can be put. In particular, since the position of the inflection point A can be obtained more accurately, by comparing each inflection point A in the second pressure diagram, an accurate sealed pressure value of the gas chamber 44 and the flexible film 43 can be easily obtained. It becomes possible to determine the mounting state of the. For this reason, the function and attachment state of the flexible membrane 43 can be obtained by processing the processing unit (CPU) 240 and checking the pressure diagram without inputting a preset value into the setting unit 25 of the computer 10. Can be easily read.
[0038]
For this reason, in the pressure vessel inspection machine according to the second embodiment of the present invention, the computer 10 uses a personal computer to perform data processing including temperature correction, and the control unit 30 of the inspection machine 1 is programmable. Programmable controller control can be performed using a controller (PC), and the inspection machine 1 can perform more accurate processing determination at low cost by the PC. And the result judged with the personal computer by PC can be sent to the test | inspection machine 1, and the quality determination of the pressure vessel 40 can also be performed with the sorting apparatus not shown in the test | inspection machine 1. FIG.
[0039]
The correction of the pressure according to the temperature in the pressure diagram in the pressure vessel 40 is calculated by the following equation (1). This is calculated by the CPU of the personal computer to create a pressure diagram. This pressure diagram is made more accurately because temperature correction for pressure is made. Therefore, it is possible to determine the quality and function of the flexible membrane 43 only by comparing the first pressure diagram P1 and the second pressure diagram P2.
[0040]
[Expression 1]
PT = (P20 + 0.101 × (273.2 + T) / (273.2 + 20)
-0.101
However,
PT: Pressure at temperature T ° C
P20: Pressure at a temperature of 20 ° C (according to product specifications)
T: Room temperature
[0041]
FIG. 6 is a flowchart of the operation centering on the computer 10 of the inspection machine 1.
Hereinafter, after explaining the inspection method of the pressure vessel 40, the flowchart of FIG. 6 will be explained.
As shown in FIGS. 1 and 4, the pressure vessel 40 is attached to the opening of the pipe 2 every time it is inspected. Then, the on-off valve 5 is opened and the working fluid is supplied from the supply source 3 to the working fluid chamber 45 of the pressure vessel 40. As the working fluid is supplied, the gas chamber 44 is compressed as shown in FIG. When the compression state proceeds to the set maximum compression capacity of the pressure vessel 40, when the on-off valve 5 is closed and the release valve 7 is opened, the working fluid chamber 45 is opened to the atmospheric pressure state. The supply and release of the working fluid is preferably performed by supplying a set constant flow rate. The first pressure diagram P1 is created by this first supply stroke.
[0042]
Next, the opening / closing valve 5 is opened in the same manner as in the first step, and a working fluid having a constant flow rate is supplied from the supply source 3 to the working fluid chamber 45. The supply of the working fluid is performed at the stage when the inflection point A is confirmed, that is, the working fluid is supplied to a slightly upper position where the inflection point appears to close the open / close valve 5 and the open valve 7 is opened to supply the working fluid in the working fluid chamber 45. Open to atmosphere.
The second pressure diagram P2 is created by this second stroke.
[0043]
Further, the second step is repeated a plurality of times as necessary to create a plurality of second pressure diagrams P2, P2,.
Each of the second pressure diagrams P2 is created according to the inspection accuracy, and one or a plurality of the second pressure diagrams P2 are determined, and the quality such as a defect of the flexible film 43 is determined by the first pressure diagram P1, and further, Whether or not the flexible film 43 is attached and whether or not the sealed pressure value in the gas chamber 44 is good are determined by comparing the inflection point A between the pressure diagram P2... And the first pressure diagram P1.
[0044]
FIG. 7 is an embodiment of each pressure diagram P1, P2,... Created by the above-described operation. This embodiment is a preferable example in which four first pressure diagrams P1, second pressure diagrams P2,. In this pressure diagram, each inflection point A is formed in a substantially similar shape. Therefore, it can be understood that the attachment state of the flexible film 43 is normal and the sealed pressure value of the gas chamber 44 is also normal. Further, it is recognized from the first pressure diagram P1 that the flexible film 43 is free from defects such as damage.
[0045]
FIG. 8 is a comparative example with respect to the pressure diagram of FIG. The first pressure diagram P1 in FIG. 8 is substantially the same as the first pressure diagram P1 in FIG. 7, but the second pressure diagram P2 in FIG. 8 is the second pressure diagram P2, P2. , P2 is different from the corresponding one in FIG. That is, there is a defect in the attached state of the flexible film 43 (a turning defect is recognized in the state where the flexible film 43 is attached), and the inflection point A does not appear.
[0046]
The aforementioned operation is controlled by the computer 10. In FIG. 6, when the pressure vessel 40 is attached to the inspection machine 1, preparation for starting an operation test of the computer 10 is completed (step K1). When the operation start signal is switched to the inspection machine 1 with the operation of the computer 10, the on-off valve 5 is opened and the working fluid is supplied to the working fluid chamber 45 (step S1). Next, the pressure sensor 8 detects the pressure in the working fluid chamber 45, and pressure data is input to the computer 10 (step K2). At the same time, the temperature sensor 9 detects the temperature of the pressure vessel 40 and inputs temperature data to the computer 10 (step K3). Then, as described above, the pressure diagram P shown in FIG. 7 is created and the operation ends (step S2).
[0047]
On the other hand, the computer 10 calculates and corrects the pressure value detected by the pressure sensor 8 based on the temperature data from the temperature sensor 9 (K4 stroke). Further, the inflection point A where the pressure of the working fluid chamber 45 and the pressure of the gas chamber 44 are balanced is calculated (step K5). The quality of the flexible film 43 is determined from the above data (step K6). Next, this determination result is output to the inspection machine 1, and a sorter (not shown) is operated to eliminate defective pressure vessels (step K7). Then, the operation test ends (K8 stroke).
[0048]
The pressure vessel inspection method as described above can reduce the cost of the inspection machine 1 and easily determine whether the flexible film 43 is attached and whether the flexible film 43 is defective. become. This determination is made with accuracy from the number of the second pressure diagrams P2, P2,..., And the comparison determination by the inflection point A becomes more accurate.
Further, by correcting the pressure data detected from the pressure sensor 8 based on the temperature data input from the temperature sensor 9, an accurate pressure diagram that can be discriminated can be obtained in a short time. Moreover, since the accuracy of the inflection points A of the number determined according to the accuracy is improved by the comparison, it becomes possible to accurately read the sealed pressure value of the gas chamber 44. For this reason, work precision can be raised by the work of the sorter in the inspection.
[0049]
【The invention's effect】
In the pressure vessel according to the first aspect of the present invention, it is possible to determine the defect defect and the response function of the flexible film by the first pressure diagram. In addition, by comparing the pressure lines including the inflection points of the first pressure diagram and the second pressure diagram, it is determined whether the flexible membrane is attached normally or abnormally and sealed in the gas chamber. It is possible to determine an appropriate range of pressure values.
[0050]
The pressure vessel inspection machine according to the second aspect of the present invention is detected by the pressure sensor because the temperature of the working fluid rises during use in a hydraulic device or the like, or rises with compression in the pressure vessel. An error also occurs in the pressure data. A normal pressure value can be obtained by correcting the error of the pressure value with the temperature data detected from the temperature sensor 9, so that it is expected to improve the accuracy of the pressure diagram. For this reason, the cost of the computer can be reduced.
[0051]
According to a third aspect of the present invention, there is provided a pressure vessel inspection machine according to the present invention, wherein a plurality of second pressure diagrams are obtained and an inflection point formed in the last pressure diagram and an inflection point of the first pressure diagram are obtained. If the diagrams including the inflection points are similar, it is recognized that the attachment state is normal. In particular, it is recognized that there is almost no problem if three or more inflection points are similar.
[0052]
The pressure vessel inspection method of the present invention according to claim 4 can determine the function of the flexible membrane by obtaining a plurality of pressure diagrams including inflection points and comparing the shapes of the inflection points. Therefore, the inspection method is highly accurate and easy for the operator to operate. Moreover, it is possible to prevent the operator from making a judgment mistake because of the method of obtaining and interpreting a plurality of inflection points.
[0053]
In the pressure vessel inspection method according to the present invention according to claim 5, since the temperature of the working fluid is detected by the temperature sensor and the pressure value is corrected by the temperature data, the first pressure diagram is also accurately grasped. I can do it. For this reason, when comparing the set value data, for example, the inflection point value and the maximum compression value, and comparing the pressure diagram, the quality of the presence or absence of defects in the flexible membrane, the inflection point can be confirmed It is possible to easily obtain the function determination based on the enclosed pressure value of the chamber.
[Brief description of the drawings]
FIG. 1 is a plan view of a pressure vessel inspection machine showing a first embodiment according to the present invention.
FIG. 2 is a cross-sectional view of a pressure vessel according to the present invention.
FIG. 3 is a configuration diagram of the computer of FIG. 1;
FIG. 4 is a plan view of a pressure vessel inspection machine showing a second embodiment according to the present invention.
5 is a configuration diagram of a computer related to the pressure vessel inspection machine shown in FIG. 4;
FIG. 6 is a flowchart of an inspection method for the pressure vessel inspection machine according to the present invention.
FIG. 7 is a pressure diagram showing one embodiment according to the present invention.
FIG. 8 is a pressure diagram actually tested under the same conditions for comparison with the pressure diagram shown in FIG. 7;
FIG. 9 is a plan view of a conventional pressure vessel inspection machine.
10 is a cross-sectional view of the pressure vessel shown in FIG.
FIG. 11 is a plan view of another inspection machine according to a conventional example.
12 is a pressure diagram actually tested by the inspection machine shown in FIG. 9;
13 is a pressure diagram actually tested by the inspection machine shown in FIG.
[Explanation of symbols]
1 Inspection machine
2 Piping
3 Supply sources
4 Pressure gauge
5 On-off valve
6 A 1st branch pipe
6 B 2nd branch pipe
7 Opening valve
8 Pressure sensor
9 Temperature sensor
10 Computer
21 Interface
22 Interface
23 Interface
24 processor
240 CPU
242 Memory unit
243 D / AC
244 A / DC
246 I / O device
25 Setting device
30 Control unit
40 pressure vessel
41 shell
42 Vacancy
43 Flexible membrane
44 Gas chamber
45 Working fluid chamber
46 Holding bracket
47 Inflow port
50 pressure vessel
51 shell
52 Vacancy
53 Oil port
54 Gas chamber
55 Working fluid chamber
56 Blada
57 Opening edge
58 Holding bracket
60 inspection machine
60A inspection machine
61 Source
62 Piping
63 Second piping
64 Third piping
65 Release valve
66 Shut-off valve
67 Pressure gauge
68 Pressure sensor
69 Recorder
70 PC
A inflection point
P1 First pressure diagram
P2 Second pressure diagram

Claims (5)

A pressure vessel inspection machine having a vacant chamber (42) therein and a flexible membrane (43) for partitioning the vacant chamber (42) into a gas chamber (44) and a working fluid chamber (45), An on-off valve (5) in a pipe for supplying the working fluid to the working fluid chamber (45), a pressure sensor (8) for detecting the pressure in the working fluid chamber (45), and the working fluid chamber (45) An opening valve (7) for discharging the supplied working fluid, and a computer (10) for inputting and processing pressure data of the pressure sensor (8), the computer (10) is provided in the gas chamber (44). The pressure data of the working fluid chamber (45) with respect to the pressure is compressed to be smaller than the first pressure diagram (P1) and the first pressure diagram (P1) of the pressure for greatly compressing the gas chamber (44). 2 to calculate the pressure diagram (P2) The function of the flexible membrane (43) by comparing the similarity and the non-similarity of the pressure line including each inflection point (A) between the pressure diagram (P1) of 1 and the second pressure diagram (P2) A pressure vessel inspection machine characterized by determining whether the product is good or bad. A pressure vessel inspection machine having a vacant chamber (42) therein and a flexible membrane (43) for partitioning the vacant chamber (42) into a gas chamber (44) and a working fluid chamber (45), On-off valve (5) in the piping for supplying the working fluid to the working fluid chamber (45), a pressure sensor (8) for detecting the pressure in the working fluid chamber (45), and the temperature of the pressure vessel (40) A temperature sensor (9) for detecting the pressure, an open valve (7) for discharging the working fluid supplied to the working fluid chamber (45), pressure data from the pressure sensor (8), and the temperature sensor (9) And a computer (10) for inputting and processing the temperature data from the gas, and the computer (10) converts the pressure data that changes according to the temperature of the working fluid chamber (45) with respect to the pressure of the gas chamber (44) to the temperature. Temperature data from sensor (9) The first pressure diagram (P1) and the second pressure diagram (P2) are corrected by the calculation processing of the first pressure diagram (P1) and the second pressure diagram (P2). A pressure vessel inspecting machine, characterized in that the quality of the flexible membrane (43) is judged by comparing the similarity and dissimilarity of the pressure line including each inflection point (A). The computer (10) obtains a plurality of the second pressure diagrams (P2) and finally has the inflection point (A) and the first pressure line in the second pressure diagram (P2) obtained. 3. The pressure vessel inspection machine according to claim 1, wherein the inflection point (A) in the figure is compared. A pressure vessel (40) in which an empty chamber is partitioned into a gas chamber (44) and a working fluid chamber (45) by a flexible membrane (43) is attached, and the working fluid chamber (45) of the pressure vessel (40) A first step of opening the on-off valve (5) to flow in the working fluid and compressing the gas chamber (44), and opening the release valve (7) to release the working fluid in the working fluid chamber (45) to the atmosphere; Further, the on-off valve (5) is opened to the working fluid chamber (45) to allow the working fluid less than the first stroke to flow to compress the gas chamber (44) and open the open valve (7) to operate. The pressure sensor (8) detects the pressure data of the working fluid chamber 45 with respect to the pressure of the gas chamber 44 in the second stroke and the first stroke and the second stroke in which the fluid is released one or more times. Input to the computer (10), the computer (1 ), The first pressure diagram (P1) is calculated from the pressure data of the first stroke and the second pressure diagram (P2) is calculated from the pressure data of the second stroke. The quality of the flexible membrane (43) is determined based on the similarity between the inflection points (A) and the similarity between the pressure diagram (P1) and the second pressure diagram (P2). The pressure vessel inspection method. The temperature data of the pressure vessel (40) is detected by a temperature sensor (9), and the computer (10) inputs the temperature data and calculates and corrects an error in which the pressure diagram changes depending on the temperature based on the temperature data. The method for inspecting a pressure vessel according to claim 4.

Images