JP7394435B2 - Gas inspection method for hoses with eye joint fittings - Google Patents

Description

The present invention relates to a gas inspection device and a gas inspection method for inspecting defects such as gas leakage from a hose with an eye joint fitting.

Automobile brakes work by converting pedal pressure into hydraulic pressure, and transmitting the hydraulic pressure to brake oil, which is sent through the brake hose to the brake caliper. BACKGROUND ART Conventionally, a brake hose used in an automobile has an eye joint fitting attached to its tip, and is connected to a brake caliper via the eye joint fitting.

If there is a problem with the brake hose, such as a scratch, there is a risk of brake oil leaking from there, so the brake hose needs to be highly airtight. In such a hose, it is necessary to test the sealability in advance.

An example of a method for testing the airtightness of a hose is a water leakage test using water pressure. However, hoses with specially shaped fittings such as eye-joint fittings or T-shaped fittings have poor water removal properties after inspection, and moisture remaining inside the hose can cause the fittings to rust. . Therefore, it is necessary to provide a drying process after the inspection.

Therefore, as a method for solving the above-mentioned water drainage problem, a gas leakage test using air pressure can be cited. Although different from a hose, Patent Document 1 describes an air pressure system that measures the air pressure inside a tire and recognizes air pressure leaks based on whether the measured pressure is within a predetermined range based on the pressure before the start of measurement. Leak detection apparatus and pneumatic leak detection methods are disclosed.

JP2001-289730

By the way, the seat surfaces provided on both sides of the annular part of the eye joint fitting are connected to the caliper via washers, etc., but if there is a defect such as a scratch on the seat surface, brake oil may leak from there. There is. The seat surface of the hose with eye joint fittings, which is the part exposed to the outside, is prone to scratches during the manufacturing and transportation processes, so it is necessary to detect scratches on the seat surface in advance, just like scratches on the hose. be. However, in the past, inspection for scratches on the sheet surface was done visually, which led to poor work efficiency and the risk of oversight.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a gas inspection device and gas inspection system for a hose with an eye joint fitting that can simultaneously detect defects such as gas leakage from the hose, the eye joint fitting, and the seat surface of the eye joint fitting. The purpose is to provide a method.

A gas type inspection device according to the present invention is a gas type inspection device for a hose in which an eye joint metal fitting having an annular portion with sheet surfaces on both sides is attached to an end side, and the eye joint metal fitting is attached to an end side. a resin member that is in close contact with the entire surface of the seat and that sandwiches the annular portion; and a pressure sensor that measures the pressure and pressure drop of the gas in the hose. It is characterized by comprising the following.

In the above configuration, the resin member is brought into close contact with the entire sheet surface of the eye joint metal fitting, and gas is supplied to the hose from the side to which the eye joint metal fitting is attached, with the annular portion being sandwiched between the resin members. At this time, if there is a defect such as a scratch on the sheet surface, a gap is created between the resin member and the sheet surface, gas leaks from the gap, and the pressure decreases. Therefore, in the above configuration, by measuring the amount of pressure drop of gas in the hose with the eye joint fitting, it is possible to simultaneously detect defects such as gas leakage from the hose, the eye joint fitting, and the seat surface of the eye joint fitting. .

The present invention also provides, in the above gas-type inspection apparatus, a second gas supply means for supplying a gas having a lower pressure than the gas supplied by the gas supply means to the hose from the side where the eye joint fitting is attached; It is preferable to include a flow rate sensor that measures the flow rate of gas flowing through the hose.

During the manufacturing process, foreign matter may get inside the hose. Foreign objects inside the hose may significantly reduce the brake oil transmission performance of the hose with the eye joint fitting. It is required to perform a clogging test.

However, when performing a hose clogging inspection using the gas supplied to the hose (hereinafter referred to as the "primary gas") in order to detect defects such as gas leakage from the hose, eye joint fittings, or seat surface, Foreign matter inside the hose may be forcibly pushed out by the gas pressure. In such a case, it becomes difficult to identify the cause of the clogging, which is inappropriate from the viewpoint of preventing clogging from occurring again.

Therefore, according to the above configuration, gas having a lower pressure than the first gas (hereinafter referred to as the second gas) is supplied to the hose from the side where the eye joint fitting is attached, and the second gas passing through the inside of the hose is controlled by the flow sensor. By measuring the flow rate, it is possible to test for clogged hoses without forcing out foreign objects inside the hose.

Moreover, in the present invention, in the gas-type inspection device, it is preferable that the resin member is made of polybutylene terephthalate.

If the material of the resin member that is brought into close contact with the entire surface of the sheet is too hard or too soft, it will not be able to seal the sheet surface sufficiently, and there is a risk that gas will leak out even if there are no scratches on the sheet surface. Therefore, by using polybutylene tephthalate with appropriate hardness for the resin member, the seat surface can be sufficiently sealed, so if there are no scratches on the seat surface, there will be no gas leakage, and there will be no scratches on the seat surface of the eye joint fitting. can be detected more reliably.

Further, the gas inspection method according to the present invention is a gas inspection method for a hose in which an eye joint fitting having an annular portion having sheet surfaces on both sides is attached to the end side, and the resin member is A step of attaching the resin member to the entire surface of the seat and sandwiching the annular portion, a gas supply step of supplying gas to the hose from the side where the eye joint fitting is attached, and a pressure sensor detecting the amount of gas in the hose. The method is characterized by comprising a pressure measuring step of measuring the amount of pressure drop and simultaneously detecting defects in the hose, the eye joint fitting, and the seat surface.

According to the above configuration, in the resin member attachment step, the resin member is brought into close contact with the entire seat surface of the eye joint fitting, and the annular portion is sandwiched between the resin members. In the subsequent gas supply process, when gas is supplied to the hose from the side where the eye joint metal fitting is attached, if there is a defect such as a scratch on the sheet surface, a gap will be created between the resin member and the sheet surface, and the gas will flow from there. It leaks and the pressure drops. In the pressure measurement process, by measuring the amount of pressure drop of the gas inside the hose with the eye joint fitting, it is possible to simultaneously detect defects such as gas leakage from the hose, the eye joint fitting, and the seat surface of the eye joint fitting. can.

The present invention also provides, in the gas-type inspection method, a second gas supply step in which a gas having a lower pressure than the gas supplied in the gas supply step is supplied to the hose from the side where the eye joint fitting is attached; It is preferable to include a flow rate measuring step of measuring the flow rate of gas flowing through the hose using a sensor.

During the manufacturing process, foreign matter may get inside the hose. Foreign objects inside the hose may significantly reduce the brake oil transmission performance of the hose with the eye joint fitting. It is required to perform a clogging test.

However, when performing a clog inspection on a hose using the primary gas supplied to the hose in order to detect defects such as gas leakage from the hose, eye joint fittings, or seat surface, the pressure of the primary gas causes the hose to become clogged. Foreign objects inside may be forcefully pushed out. In such a case, it becomes difficult to identify the cause of the clogging, which is inappropriate from the viewpoint of preventing clogging from occurring again.

Therefore, according to the above configuration, in the second gas supply step, the second gas having a lower pressure than the first gas is supplied to the hose from the side where the eye joint fitting is attached, and in the flow rate measurement step, the second gas is supplied to the hose through the inside of the hose. By measuring the flow rate of the second gas, a hose clogging test can be performed without forcing out foreign matter inside the hose.

Moreover, in the present invention, in the gas-type inspection method, it is preferable that the resin member is made of polybutylene terephthalate.

If the material of the resin member that is brought into close contact with the entire surface of the sheet is too hard or too soft, it will not be able to seal the sheet surface sufficiently, and there is a risk that gas will leak out even if there are no scratches on the sheet surface. Therefore, by using polybutylene tephthalate with appropriate hardness for the resin member, the seat surface can be sufficiently sealed, so if there are no scratches on the seat surface, there will be no gas leakage, and there will be no scratches on the seat surface of the eye joint fitting. can be detected more reliably.

According to the present invention, there is provided a gas inspection device and a gas inspection method for a hose with an eye joint fitting, which can simultaneously detect defects such as gas leakage from the hose, the eye joint fitting, and the seat surface of the eye joint fitting. can be provided.

1 is a schematic diagram of a gas-type inspection device according to an embodiment. 2(a) is a perspective view of the eye joint fitting portion, and (b) is a sectional view taken along line AA in FIG. 2(a). FIG. 3 is a diagram illustrating a state in which a hose with an eye joint fitting is attached to an attachment part of a gas-type inspection device, and before a resin member attaching step. FIG. 3 is a diagram illustrating a state in which a hose with an eye joint fitting is attached to an attachment portion of a gas-type inspection device, and the state after a resin member attachment step. FIG. 4 is an enlarged perspective view of the annular portion inserted into the pin in FIG. 3; It is a figure which shows the area|region where the gas exists in a gas type inspection apparatus in a resin attachment process. It is a figure which shows the area|region where compressed gas exists in a gas-type inspection apparatus in a 1st gas supply process. FIG. 3 is a diagram showing compressed gas sealed in a pressure measurement area within the gas-type inspection device. It is a figure which shows the area|region where the gas exists in a gas type inspection apparatus in a 2nd gas supply process and a flow rate measurement process.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

In this embodiment, the gas type inspection device 1 is a device that inspects a hose 10 with an eye joint fitting. As shown in FIG. 1, the gas-type inspection device 1 is equipped with a first compressed gas source 2 that sends a first gas 102, a second compressed gas source 3 that sends a second gas 103, and a hose 10 with an eye joint fitting. It is composed of a mounting part 4, a pressure sensor 5 that measures the pressure of gas inside the hose 10 with an eye joint fitting, and a flow rate sensor 6 that measures the flow rate of gas flowing inside the hose 10 with an eye joint fitting. The first compressed gas source 2 and the pressure sensor 5 are each connected to the attachment part 4 via piping 7. Further, the second compressed gas source 3 is connected to a flow rate sensor 6 via a pipe 7, and the flow rate sensor 6 is further connected to the attachment part 4 via a pipe 7.

Moreover, two gate valves 21 and 22 are arranged in series between the first compressed gas source 2 and the attachment part 4. A pipe 7 branches between the gate valves 21 and 22, and a gate valve 23 is disposed at the end of the branched pipe 7, which further communicates with the atmosphere.
Further, a gate valve 24 is disposed between the second compressed gas source 3 and the flow rate sensor 6, and a check valve 25 is disposed between the flow rate sensor 6 and the mounting portion 4.

(Hose 10 with eye joint fittings)
The hose 10 with an eye joint fitting includes a hose 11 and an eye joint fitting 12 attached to the end side of the hose 11, as shown in FIG. 2(a). Further, the eye joint fitting 12 includes a hose connection portion 13 , a neck portion 14 , and an annular portion 15 . The hose connection portion 13 is a portion provided at one end of the eye joint fitting 12 and connected to the hose 11. The neck portion 14 is a portion that connects the hose connection portion 13 and the annular portion 15. Further, the axes of the hose 11, the hose connection portion 13, and the neck portion 14 coincide with each other. The annular portion 15 is an annular portion provided at the other end of the eye joint fitting 12, and has substantially flat sheet surfaces 16 on both sides. Further, the axis of the annular portion 15 and the axis of the hose 11 are perpendicular to each other.

Further, as shown in FIG. 2(b), a through hole 17 passes through the inside of the hose connection part 13, the inside of the neck part 14, and the side wall surfaces at approximately the center of both sides of the annular part 15. Note that the through hole 17 is connected to a pipe within the hose 11.

Note that the eye joint fitting 12 may be attached only to one end side of the hose 11, or may be attached to both ends. When the eye joint metal fitting 12 is attached only to one end of the hose 11, the metal fitting attached to the other end may be, for example, a male metal fitting or a female metal fitting, but other metal fittings may be used.

(Compressed gas sources 2 and 3)
The first compressed gas source 2 is a compressed gas source that supplies the first gas 102 (for example, 15.3 MPa). Further, the second compressed gas source 3 is a compressed gas source that supplies a second gas 103 having a lower pressure than the first gas 102 (for example, 0.2 to 0.3 MPa). A first gas 102 and a second gas 103 supplied from the first compressed gas source 2 and the second compressed gas source 3 are sent to the hose 10 with an eye joint fitting through the piping 7.
Note that the first gas 102 and the second gas 103 are generally air, but may be other gases.

(Mounting part 4)
As shown in FIGS. 3 and 4, the mounting portion 4 includes a pin 30, resin members 31 and 32, a pressure cylinder 33, and a protection plate 34. Hereinafter, in FIGS. 3 to 5, the side of the mounting portion 4 where the pressure cylinder 33 and the resin member 32 are arranged is defined as the upper side, and the side where the pin 30 and the resin member 31 are arranged is defined as the lower side.

The pin 30 has a cylindrical shape, and its outer diameter is smaller than the inner diameter of the annular portion 15 of the eye joint fitting 12. The pin 30 is inserted into the annular portion 15 from below in a direction perpendicular to the seat surface 16, as shown in FIG. Moreover, the pin 30 has a gas supply hole 35 therein for supplying the gas sent from the piping 7 to the hose.

As shown in FIGS. 4 and 5, the gas supply hole 35 is connected to the pipe 7 and extends from the bottom of the pin 30 toward the top to a predetermined position inside the pin 30. Here, the predetermined position means that when the pin 30 is inserted into the annular portion 15, the pin 30 and the annular portion 15 are aligned when viewed from a direction perpendicular to the axis of the pin 30. This is an arbitrary point inside the pin 30 among the overlapping parts. Then, at the predetermined position, it is bent in a direction perpendicular to the direction of extension, that is, outward in the radial direction of the pin 30, and is inserted up to the side surface of the pin 30.

The bending position of the gas supply hole 35 is preferably on substantially the same plane as the midpoint between the upper and lower surfaces of the annular portion 15, and the gas supply hole 35 is bent in four directions toward the outside in the radial direction of the pin 30. It is preferable that With these configurations, gas can be efficiently supplied to the hose 10 with the eye joint fitting.
Furthermore, it is preferable that the angles of the branches in the four directions are equidistant from each other. Thereby, gas can be uniformly supplied to the sheet surface 16, so defects such as scratches on the sheet surface 16 can be detected more reliably.

The resin members 31 and 32 are annular members. As shown in FIG. 3, the resin member 31 is attached to the pin 30, and the resin member 32 is attached to the tip of a pressure cylinder 33, which will be described later. Further, when fixing the hose 10 with the eye joint fitting and supplying gas, the resin members 31 and 32 are in close contact with the entire surfaces of the upper and lower sheet surfaces 16, respectively, as shown in FIG. Insert.

The material of the resin members 31 and 32 is not particularly limited, but it is preferable that the resin members 31 and 32 be made of a material that does not damage the sheet surface 16 and can ensure sufficient airtightness when the resin members 31 and 32 are brought into close contact with the entire surface of the sheet surface 16. Therefore, examples of the material for the resin members 31 and 32 include polyethylene terephthalate, polybutylene terephthalate, etc., but polybutylene terephthalate is most preferable from the viewpoint of cost.

Furthermore, although the resin members 31 and 32 may be made of different materials, they are preferably made of the same material in order to equalize the accuracy of defect inspection for defects such as scratches on the sheet surfaces 16 on both sides.

The pressurizing cylinder 33 is arranged on the same axis as the pin 30 and above the mounting part 4, as shown in FIG. As described above, the resin member 32 is attached to the tip of the pressurizing cylinder 33, and is configured to be able to rise and fall along the axis.

The protection plate 34 is a member that protects the contact surface of the resin member 32 with the sheet surface 16. As shown in FIG. 3, the protection plate 34 is provided between the pressure cylinder 33 and the resin member 32, and the pin 30 and the resin member 31, and has a configuration that allows it to be accommodated. As shown in FIG. 4, the protection plate 34 is housed by moving on an axis perpendicular to the axial direction of the pin 30 and the pressure cylinder 33. The protection plate 34 prevents the contact surface of the resin member 32 with the sheet surface 16 from being damaged due to contact with the eye joint fitting 12, for example, when the hose 10 with the eye joint fitting is attached to the attachment part 4.
Note that the protection plate 34 may not be provided.

(Pressure sensor 5)
The pressure sensor 5 is a sensor that measures the pressure of gas in a closed space that includes the pressure sensor 5. In this embodiment, in a state where the end side of the hose 10 with an eye joint fitting that is not connected to the attachment part 4 is sealed, the pressure sensor 5, the gate valve 22, the hose 10 with an eye joint fitting, and the check valve 25 are sealed. (See FIG. 1).

(Flow rate sensor 6)
The flow rate sensor 6 is a sensor that measures the flow rate of gas passing through the flow rate sensor 6. In this embodiment, the hose 10 with the eye joint fitting passes through the flow rate sensor 6 from the gate valve 24 side toward the check valve 25 side in a state where the end side not connected to the attachment part 4 is exposed to the atmosphere. The flow rate of the second gas 103 is measured (see FIG. 1).

(gate valve)
The gate valves 21, 22, and 24 are valves that can be opened and closed. The first gas 102 is supplied from the first compressed gas source 2 when the gate valve 21 is open, and is not supplied when the gate valve 21 is closed. Further, the second gas 103 is supplied from the second compressed gas source 3 when the gate valve 24 is open, and is not supplied when the gate valve 24 is closed. When the gate valve 22 is closed, the supply of the first gas 102 sent from the first compressed gas source 2 to the attachment portion 4 is stopped. Further, the gate valve 23 communicates with the atmosphere, and when the valve is open, it is exposed to the atmosphere.

(non-return valve)
The check valve 25 has the function of always maintaining the flow of gas in one direction and preventing backflow. In this embodiment, the check valve 25 is arranged between the flow rate sensor 6 and the attachment part 4, and the second gas 103 supplied from the second compressed gas source 3 is directed from the flow rate sensor 6 to the attachment part 4. flows only to

Next, a method for inspecting the hose 10 with an eye joint fitting using the above-mentioned gas type inspection device 1 will be explained based on FIGS. 6 to 9. Note that in FIGS. 6 to 9, the thick line portion of the pipe 7 is the region where the first gas 102 and/or the second gas 103 exists in each step.

(Resin member installation process)
First, as shown in FIG. 6, with the gate valves 21 and 24 closed and the gate valve 22 opened, attach the side of the hose 10 with the eye joint fitting 10 to which the eye joint fitting 12 is attached to the mounting part 4 using the resin. Perform the component installation process. At this time, the first gas 102 and the second gas 103 are not supplied into the gas-type inspection apparatus 1. Then, as shown in FIG. 3, the seat surface 16 of the annular portion 15 of the eye joint fitting 12 is inserted into the pin 30 from above so as to be perpendicular to the pin 30. At this time, the seat surface 16 on the lower side of the annular portion 15 is in contact with the resin member 31. Subsequently, as shown in FIG. 4, by storing the protection plate 34 and lowering the pressure cylinder 33, the resin member 32 and the entire surface of the seat surface 16 above the annular portion 15 are brought into close contact. Further, since the annular portion 15 is pressed against the resin member 31 by the pressurizing cylinder 33, the resin member 31 and the entire surface of the seat surface 16 below the annular portion 15 are brought into close contact with each other. As described above, both upper and lower surfaces of the annular portion 15 are sandwiched between the resin members 31 and 32, and the resin member attaching process is completed.

(First gas supply process)
First, as shown in FIG. 7, the side of the hose 10 with the eye joint fitting that is not attached to the attachment part 4 is sealed with a member made of urethane resin or the like. Next, the first gas 102 is supplied from the first compressed gas source 2 with the gate valve 23 closed and the gate valves 21 and 22 opened. When the pressure inside the hose 10 with the eye joint fitting reaches the supply pressure of the first gas 102, that is, when the inside of the hose 10 with the eye joint fitting is filled with the first gas 102, the gate valve 22 is closed. At this time, a combined area of the pipe 7 surrounded by the pressure sensor 5, gate valve 22, and check valve 25 and the inside of the hose 10 with an eye joint fitting that is sealed on one side (hereinafter referred to as pressure measurement A first gas 102 is enclosed in a region (referred to as a region) (see FIG. 8).
Note that if there is a defect such as a scratch on any of the hose 11, the eye joint fitting 12, and the seat surface 16, the pressure inside the hose 10 with the eye joint fitting will not reach the supply pressure of the first gas 102 in this process. Sometimes. In this case, the hose 10 with the eye joint fitting is determined to be a defective product without performing the subsequent pressure measurement step.

After closing the gate valve 22, the gate valve 21 is closed and the supply of the first gas 102 from the first compressed gas source 2 is stopped. Then, the gate valve 23 is opened, and the first gas 102 remaining in the area surrounded by the gate valve 21, gate valves 22, and 23 of the pipe 7 is released to the atmosphere.

(Pressure measurement process)
The pressure sensor 5 measures the amount of pressure drop in the pressure measurement area based on the pressure in the pressure measurement area immediately after the filling of the first gas 102 is completed. If the amount of pressure drop in the pressure measurement area is equal to or greater than the specified value, it is determined that the hose 10 with the eye joint fitting has a defect such as a scratch on any of the hose 11, the eye joint fitting 12, and the seat surface 16.
If any of the hose 11, the eye joint fitting 12, and the seat surface 16 of the hose 10 with an eye joint fitting has a defect such as a scratch, the enclosed first gas 102 leaks from the pressure measurement area, and the pressure drops. Therefore, by measuring the amount of pressure drop in the pressure measurement area, it is possible to simultaneously detect defects such as gas leakage from the hose 11, the eye joint fitting 12, and the seat surface 16 of the hose 10 with the eye joint fitting.

Here, the specified value is an arbitrary value depending on the pressure of the first gas 102 supplied by the first compressed gas source 2, the type of the hose 10 with the eye joint fitting to be inspected, the measurement performance of the pressure sensor 5, etc. The value of is set.

In this process, if the detected pressure drop is less than the specified value, it is determined that there are no defects such as scratches on the hose 11, eye joint fitting 12, and seat surface 16, and the subsequent second gas supply process and flow measurement process are performed. I do. After the pressure measurement step and before proceeding to the second gas supply step, the gate valve 22 is opened, and the first gas 102 in the pressure measurement area is released to the atmosphere through the already opened gate valve 23 (see FIG. 8). ).

(Second gas supply process)
First, the seal on the side of the hose 10 with the eye joint fitting that is not attached to the attachment part 4 is removed and the hose 10 is opened to the atmosphere. Subsequently, after closing the gate valve 22, the gate valve 24 is opened and the second gas 103 is supplied from the second compressed gas source 3. As a result, as shown in FIG. 9, the second gas 103 flows through the pipe 7 in the order of the flow rate sensor 6, the check valve 25, the attachment part 4, and the hose 10 with the eye joint fitting, and is released into the atmosphere.
Note that by arranging the check valve 25, the first gas 102 does not flow from the mounting portion 4 toward the flow rate sensor 6.

(Flow rate measurement process)
The flow rate value of the second gas 103 flowing through the flow rate sensor 6 is measured. Since the second gas 103 flows in the order described above, the flow rate of the gas flowing through the flow rate sensor 6 is the same as the flow rate of the gas flowing inside the hose 10 with the eye joint fitting. When foreign objects or the like are present inside the hose 10 with an eye joint fitting, the flow of gas through the hose 10 with an eye joint fitting is obstructed, and the flow rate of the second gas 103 flowing through the flow rate sensor 6 is reduced. . Therefore, by measuring the flow rate of the second gas 103 flowing through the flow rate sensor 6, it is possible to detect whether or not the hose 10 with the eye joint fitting is clogged with foreign matter or the like.
In this way, by using the second gas 103 having a lower pressure than the first gas 102, a clogging test can be performed without forcibly pushing out the foreign matter inside the hose 10 with the eye joint fitting.

Note that switching between opening and closing of the gate valves 21, 22, and 24 may be performed manually, but is preferably performed automatically using a solenoid valve or the like.

According to the configuration of the above embodiment, the gas type inspection device 1 according to the present embodiment includes an eye joint fitting 12 having an annular portion 15 provided with seat surfaces 16 on both sides of the eye joint fitting 12 attached to the end side. A gas-type inspection device 1 for a hose 10 with a metal fitting includes a first compressed gas source 2 that supplies a first gas 102 to the hose 10 with an eye joint metal fitting from the side to which the eye joint metal fitting 12 is attached, and a first compressed gas source 2 that supplies a first gas 102 to the hose 10 with an eye joint metal fitting 10, and the entire surface of the seat surface 16. It is characterized by comprising resin members 31 and 32 that are in close contact with and sandwich the annular portion 15, and a pressure sensor 5 that measures the pressure and pressure drop of the first gas 102 in the hose 10 with an eye joint fitting. .

In the above configuration, the resin members 31 and 32 are brought into close contact with the entire surface of the seat surface 16 of the eye joint fitting 12, and the annular portion 15 is sandwiched between the resin members 31 and 32 from the side to which the eye joint fitting 12 is attached. A first gas 102 is supplied to the hose 10 with the eye joint fitting. At this time, if there is a defect such as a scratch on the sheet surface 16, a gap is created between the resin members 31 and 32 and the sheet surface 16, and the first gas 102 leaks from there, resulting in a decrease in pressure. Therefore, in the above configuration, by measuring the amount of pressure drop of the first gas 102 in the hose 10 with the eye joint fitting, gas leakage from the hose 11, the eye joint fitting 12, and the seat surface 16 of the eye joint fitting 12 can be detected. Malfunctions can be detected simultaneously.

In addition, the gas type inspection device 1 according to the present embodiment supplies a second compressed gas 103 having a lower pressure than the first gas 102 to the hose 10 with the eye joint fitting from the side where the eye joint fitting 12 is attached. It is characterized by comprising a source 3 and a flow rate sensor 6 that measures the flow rate of the second gas 103 flowing inside the hose 10 with an eye joint fitting.

During the manufacturing process and the like, foreign matter may get mixed into the hose 11. Foreign objects inside the hose 11 may significantly reduce the brake oil transmission performance of the hose 10 with the eye joint fitting, so check for defects such as gas leakage from the hose 11, the eye joint fitting 12, and the seat surface 16 as described above. In addition, it is required to perform a clogging test on the hose 11.

However, in order to detect malfunctions such as gas leakage from the hose 11, the eye joint fitting 12, and the seat surface 16, the first gas 102 supplied to the hose 10 with the eye joint fitting is used to When performing a clogging test, the pressure of the first gas 102 may forcibly push out foreign matter within the eye joint fitting hose 10 . In such a case, it becomes difficult to identify the cause of the clogging, which is inappropriate from the viewpoint of preventing clogging from occurring again.

Therefore, according to the above configuration, the second gas 103 having a lower pressure than the first gas 102 is supplied to the hose 10 with the eye joint metal fitting from the side where the eye joint metal fitting 12 is attached, and the flow rate sensor 6 By measuring the flow rate of the second gas 103 passing through the hose 10, it is possible to inspect the hose 10 with the eye joint fitting for clogging without pushing out foreign matter inside the hose 10 with the eye joint fitting.

Further, in the gas type inspection device 1 according to this embodiment, it is preferable that the resin members 31 and 32 are made of polybutylene terephthalate.

If the material of the resin members 31 and 32 that is brought into close contact with the entire surface of the seat surface 16 is too hard or too soft, it will not be able to seal the seat surface 16 sufficiently, and there is a risk that gas will leak out even if there is no scratch on the seat surface 16. There is. Therefore, by using polybutylene tephthalate with appropriate hardness for the resin members 31 and 32, the seat surface 16 can be sufficiently sealed, so if there are no scratches on the seat surface 16, there will be no gas leakage, and the eye joint metal Detection of flaws on the sheet surface 16 of No. 12 can be performed more reliably.

In addition, the gas inspection method according to the present embodiment includes a gas inspection method for a hose 10 with an eye joint fitting, in which an eye joint fitting 12 having an annular portion 15 having a sheet surface 16 on both sides is attached to the end side. The method includes a step of attaching the resin members 31 and 32 to the entire surface of the seat surface 16 and sandwiching the annular portion 15, and a step of attaching the resin members 31 and 32 to the hose 10 with the eye joint fitting from the side where the eye joint fitting 12 is attached. In the first gas supply step, the gas 102 is supplied, and the pressure drop of the first gas 102 in the hose 10 with the eye joint fitting is measured by the pressure sensor 5, and a malfunction of the hose 11, the eye joint fitting 12, and the seat surface 16 is detected. The present invention is characterized by comprising a pressure measurement step of simultaneously detecting the pressure.

According to the above configuration, in the resin member attachment process, the resin members 31 and 32 are brought into close contact with the entire surface of the seat surface 16 of the eye joint fitting 12, and the annular portion 15 is sandwiched between the resin members 31 and 32. In the subsequent first gas supply step, when the first gas 102 is supplied to the eye joint fitting hose 10 from the side where the eye joint fitting 12 is attached, if there is a defect such as a scratch on the sheet surface 16, the resin members 31 and 32 A gap is created between the first gas 102 and the seat surface 16, from which the first gas 102 leaks and the pressure decreases. Then, in the pressure measurement step, by measuring the amount of pressure drop of the first gas 102 in the hose 10 with the eye joint fitting, gas leakage from the hose 11, the eye joint fitting 12, and the seat surface 16 of the eye joint fitting 12 is detected. defects can be detected simultaneously.

Moreover, the gas-type inspection method according to the present embodiment includes a second gas supply step in which a second gas 103 having a lower pressure than the first gas 102 is supplied to the hose 10 with the eye joint fitting from the side where the eye joint fitting 12 is attached. and a flow rate measurement step of measuring the flow rate of the second gas 103 flowing inside the hose 10 with the eye joint fitting by the flow rate sensor 6.

During the manufacturing process and the like, foreign matter may get mixed into the hose 11. Foreign objects inside the hose 11 may significantly reduce the brake oil transmission performance of the hose 10 with the eye joint fitting, so check for defects such as gas leakage from the hose 11, the eye joint fitting 12, and the seat surface 16 as described above. In addition, it is required to perform a clogging test on the hose 11.

However, in order to detect malfunctions such as gas leakage from the hose 11, the eye joint fitting 12, and the seat surface 16, the first gas 102 supplied to the hose 10 with the eye joint fitting is used to When performing a clogging test, the pressure of the first gas 102 may forcibly push out foreign matter within the eye joint fitting hose 10 . In such a case, it becomes difficult to identify the cause of the clogging, which is inappropriate from the viewpoint of preventing clogging from occurring again.

Therefore, according to the above configuration, in the second gas supply step, the second gas 103 having a lower pressure than the first gas 102 is supplied to the hose 10 with the eye joint fitting from the side where the eye joint fitting 12 is attached, and the flow rate is measured. In the process, by measuring the flow rate of the second gas 103 passing through the hose 10 with eye joint fittings, the hose 10 with eye joint fittings is inspected for clogging without pushing out foreign matter inside the hose 10 with eye joint fittings. be able to.

Further, in the gas inspection method according to this embodiment, it is preferable that the resin members 31 and 32 are made of polybutylene terephthalate.

If the material of the resin members 31 and 32 that is brought into close contact with the entire surface of the seat surface 16 is too hard or too soft, it will not be able to seal the seat surface 16 sufficiently, and there is a risk that gas will leak out even if there is no scratch on the seat surface 16. There is. Therefore, by using polybutylene tephthalate with appropriate hardness for the resin members 31 and 32, the seat surface 16 can be sufficiently sealed, so if there are no scratches on the seat surface 16, there will be no gas leakage, and the eye joint metal Detection of flaws on the sheet surface 16 of No. 12 can be performed more reliably.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these examples, and various modifications can be made within the scope of the claims.

For example, in the above embodiment, a case has been described in which the side of the hose 10 with an eye joint fitting that is not attached to the attachment part 4 is sealed with urethane resin in the resin member attachment process. When the joint fittings 12 are attached, the annular portions 15 of the two eye joint fittings 12 may be attached to the attachment portions 4 of two different gas-type inspection devices 1, respectively. In this case, the first gas 102 is supplied from the gas-type inspection device 1 to the hose 10 with eye joint fittings, which has eye joint fittings 12 attached to both ends. In the pressure measurement process, by measuring the amount of pressure drop inside the hose 10 with eye joint fittings, defects such as scratches on the seat surface 16 of the eye joint fittings 12 at both ends can be detected at the same time in a single inspection. can.

Moreover, the first compressed gas source 2 and the second compressed gas source 3 may be integrated. In this case, the compressed gas source is capable of changing the pressure of the gas it supplies, and the first gas 102 and the second gas 103 are each supplied from one compressed gas source. Moreover, in this case, the flow rate sensor 6 and the check valve 25 are arranged between the gate valve 21 and the gate valve 22. In both the first gas supply step and the second gas supply step, the first gas 102 or the second gas 103 is supplied with the gate valves 21 and 22 open and the gate valve 23 closed. conduct.

Further, in the present embodiment, urethane resin is used as the resin for sealing the side of the hose 10 with eye joint fittings that is not attached to the attachment part 4, but other materials may be used.

Next, specific examples of the present invention will be described.
As an example, in a gas type inspection apparatus 1 as shown in FIG. 1, the first compressed gas source 2 was set so that the supply pressure of the first gas 102 was 15.3 MPa, and a flaw detection test on the sheet surface 16 was conducted. went. In the flaw detection test, the amount of pressure drop is measured using the gas inspection device 1 for multiple samples (hose 10 with eye joint fittings) that have scratches of different depths from the inner surface to the outer surface of the sheet surface 16. did. When the amount of pressure drop was greater than or equal to the specified value, scratches on the sheet surface 16 were made detectable, and when the amount was less than the specified value, they were made undetectable. Further, the specified value was 0.15 MPa, which corresponds to about 1% of the supply pressure of the first gas 102. Table 1 below shows a photograph of the sheet surface 16 of each sample, the depth of the scratches, and the measured values of the amount of pressure drop.
Note that for each sample used in the examples, it is assumed that the hose 11 has no scratches.

As shown in Table 1, when there was a flaw with a depth of 21 μm or more on the sheet surface 16, the amount of pressure drop was greater than the specified value, and it was found that the flaw was detectable. The depth of the scratches on the seat surface 16 where brake oil actually leaks is 30 μm or more, and it can be said that the accuracy of detecting scratches on the seat surface 16 according to the present invention is sufficient to detect these.

1 Gas type inspection device 2 First compressed gas source 3 Second compressed gas source 4 Mounting part 5 Pressure sensor 6 Flow rate sensor 7 Piping 10 Hose with eye joint fitting 11 Hose 12 Eye joint fitting 15 Annular part 16 Seat surfaces 21, 22 , 23, 24 Gate valve 25 Check valve 30 Pins 31, 32 Resin member 33 Pressure cylinder 34 Protective plate 35 Gas supply hole 102 First gas 103 Second gas

Claims (5)

A gas-type inspection method for a hose in which an eye joint fitting having an annular part with sheet surfaces on both sides is attached to the end side,
By lowering the pressure cylinder, which is configured to be able to rise and fall along the axis, the upper resin member attached to the lower tip of the pressure cylinder is applied to the entire surface of the seat above the annular portion. At the same time, the entire lower sheet surface of the annular portion is pressed against the lower resin member, and the annular portion is sandwiched between the upper resin member and the lower resin member, and the eye joint fitting is held in place. A fixing resin member installation process,
a gas supply step of supplying gas to the hose from the side where the eye joint fitting is attached;
a pressure measuring step of measuring the amount of pressure drop of the gas in the hose with a pressure sensor and simultaneously detecting a malfunction of the hose, the eye joint fitting, and the seat surface;
In the pressure measurement step, if the amount of pressure drop reaches 1% of the pressure of the gas supplied to the hose in the gas supply step, it is determined that there is a penetration flaw in the sheet surface. Inspection method. a second gas supply step of supplying gas at a lower pressure than the gas supplied in the gas supply step to the hose from the side where the eye joint fitting is attached;
2. The gas type inspection method according to claim 1 , further comprising a flow rate measuring step of measuring the flow rate of the gas flowing inside the hose using a flow rate sensor. 3. The gas inspection method according to claim 1 , wherein the upper resin member and the lower resin member are made of polybutylene terephthalate. In the pressure measurement step, if the pressure drop amount reaches 1% of the pressure of the gas supplied to the hose in the gas supply step, determining that the penetration flaw with a depth of 21 μm or more exists on the sheet surface. The gas-type inspection method according to any one of claims 1 to 3 , characterized by: 5. The gas inspection method according to claim 1, wherein in the gas supply step, the pressure of the gas supplied to the hose is 15.3 MPa or more.

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