JP3061873B2 - Method and apparatus for inspecting sealing property of sealing element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for inspecting the sealing property of a sealing element, and more particularly to a sealing method for a sealing element suitable for judging whether or not a sealing property of an annular sealing element such as an oil seal or packing is defective. The present invention relates to a sex test method and a device therefor.

[0002]

2. Description of the Related Art A sealing element such as an oil seal cannot provide sufficient sealing performance if a defect such as a scratch, sink mark, or foreign matter occurs in a lip portion that exhibits a sealing function. For this reason, the appearance of the lip is inspected.

However, the method of visually inspecting the appearance of the lip cannot sufficiently detect a defect. Therefore, as shown in FIG. 3, a method of determining the presence or absence of a defect by a leak test is employed.

In this inspection method, an oil seal 51 is mounted as a sealing element on a shaft 50 having the same dimensions and the same sliding surface roughness as an actual shaft, and an upper jig 52 and a lower jig 53 are attached. The oil seal 51 is housed in the chamber 54 formed by the above, and a working fluid such as air, water, oil, or an inert gas is injected into the chamber 54 from the pressure input port 55, and is defined in the lip portion 56 of the oil seal 51. Of the working fluid leaking from the pressure output port 57 to the atmosphere or the flow rate of the working fluid, or the amount of pressure drop due to the leak of the applied pressure is measured. This is compared with an allowable value, and the presence or absence of a defect in the sealing property is determined from the result of the comparison.

[0005]

However, in the conventional method, a plurality of oil seals 51 are inspected.
When there are variations in the inner diameter of the lip portion 56 of the oil seal 51 when, variations occur in the contact pressure between the shaft 50 and the lip 56, an error occurs in the measurement value of the pressure or flow rate, etc. of the working fluid, precision There is a problem that a good inspection cannot be performed.

An object of the present invention is to provide a method for inspecting the sealing property of a sealing element which can inspect the presence or absence of a defect in the sealing property with high accuracy even if the inner diameter of the lip portion of the annular sealing element to be inspected varies. It is to provide the device.

[0007]

According to a first aspect of the present invention, a tapered portion is provided in a shaft insertion hole of an annular sealing element inserted into a storage chamber. The shaft is sequentially inserted to detect the contact load between the lip portion of the annular sealing element and the shaft, and when the detected load becomes equal to the set value, the position of the shaft is fixed. A working fluid is injected into the space between the housing chamber and the shaft and the annular sealing element, and the pressure or flow rate of the working fluid is measured, and the presence or absence of a sealing defect is determined from the measurement result. This adopts a sealability inspection method.

[0008] As a second method, the inner diameter of the lip of the annular sealing element is measured, and then the annular sealing element is inserted into the accommodating chamber. Insert the shafts sequentially, compare the measured values of the shaft outer diameter and the lip inner diameter according to the amount of movement of the shaft, fix the position of the shaft when the difference between them becomes equal to the set value, After that, the working fluid is injected into the space between the housing chamber and the shaft and the annular sealing element, and the pressure or the flow rate of the working fluid is measured, and the presence or absence of a sealing property defect is determined from the measurement result. This adopts a method for inspecting the sealing property of the element.

[0009] As a first device, a container having an accommodating chamber for accommodating an annular sealing element, a fluid passage communicating with the accommodating chamber, and a shaft insertion passage; A shaft that can be inserted into the insertion hole and the shaft insertion passage of the container, and this shaft is sequentially inserted from the shaft insertion passage of the container into the shaft insertion hole of the annular sealing element in the storage chamber, and the shaft is fixed at a designated position according to a command Movement control means, and a contact load measurement means for detecting a contact load between the lip portion of the annular sealing element and the shaft, and outputting a shaft fixing command to the movement control means when the detected load becomes equal to a set value; Working fluid measuring means for measuring the pressure or flow rate of the working fluid injected into the fluid passage of the container and the space between the shaft and the annular sealing element; Is obtained by constituting the sealing property test device of the sealing element, characterized in that from the measurement results of the stage equipped with a determination unit configured to determine whether the seal of the defect.

As a second device, a container having an inner diameter measuring means for measuring the inner diameter of the lip portion of the annular sealing element, a housing chamber for housing the annular sealing element, a fluid passage communicating with the housing chamber, and a shaft insertion passage A shaft having a tapered portion at the tip end and capable of passing through the shaft insertion hole of the annular sealing element and the shaft insertion passage of the container; and inserting the shaft from the shaft insertion passage of the container into the shaft of the annular sealing element in the accommodation chamber. Movement control means, which is inserted sequentially into the hole and fixes the shaft at the designated position according to the command, and the measured values of the shaft outer diameter and inner diameter measuring means are sequentially compared according to the movement of the shaft, and the difference between the two is the set value. And an interference injected into the space between the fluid passage of the container and the shaft and the sealing element. A working fluid measuring means for measuring the pressure or flow rate of the body, a sealing property test device of the sealing element, characterized in that it comprises a determination means from the measurement results whether the sealing of the defect of the working fluid measuring means It is composed.

[0011]

According to the method and the apparatus of the present invention , the shaft is sequentially inserted into the shaft insertion hole of the annular sealing element, and when the contact load between the lip portion of the annular sealing element and the shaft becomes equal to the set value, the shaft is inserted. the position is fixed, since the space portion and injecting a working fluid into the fluid passage between the shaft and the annular sealing element in this state, and from the pressure or flow of the working fluid so as to determine the presence or absence of the seal of the defect, the even if there are variations in the inner diameter of the lip portion of the ring-shaped sealing element, it is possible to prevent the error in the measurement value of the working fluid.

According to another method and apparatus of the present invention,
For example, the inner diameter of the lip portion of the annular sealing element is measured in advance, and then the shaft is sequentially inserted into the shaft insertion hole of the annular sealing element, and when the difference between the outer diameter of the shaft and the inner diameter of the lip portion becomes equal to the set value. In this state, the working fluid is injected into the fluid passage and the space between the shaft and the annular sealing element, and the presence or absence of a sealing defect is determined from the pressure or flow rate of the working fluid. Because each ring
Even if there is a variation in the inner diameter of the lip portion of the sealing element, it is possible to prevent an error in the measured value of the working fluid.

[0013]

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, a container 10 is composed of an upper jig 11 and a lower jig 12, and a shaft insertion passage 13, a pressure input port 14, and a fluid passage 15 are provided in the upper jig 11.
Are formed. The lower jig 12 has a pressure output port 1
6 and a fluid passage 17 are formed.
The lower jig 12 and the lower jig 12 are respectively formed with concave portions forming the storage chamber 18 in cooperation with each other.

An oil seal 19 as an annular sealing element is accommodated in the accommodation chamber 18. The oil seal 19 has a shaft insertion hole 20 formed on the inner peripheral side thereof and an annular lip 21. Are formed.
An O-ring 22 is mounted in the middle of the shaft insertion passage 13, and a shaft 23 is slidably inserted into the shaft insertion passage 13.

The shaft 23 has a tapered portion 24 at a front end, and a rear end side is connected to a piston rod 26 via a load cell 25 as a load measuring means, and the piston rod 26 is connected to a piston 28 of a driving device 27. It is connected to.

The load cell 25 detects a contact load between the shaft 23 and the lip portion 21, converts the detected load into an electric signal, and outputs the electric signal to the control device 29. The control device 29 controls the drive of the drive device 27 while monitoring the signal from the load cell 25, and controls the drive of a brake device (not shown) for restraining the shaft 23.

That is, after the drive command is output to the drive device 27, the shaft fixing command is output to the brake device when the detected load of the load cell 25 becomes equal to the set value.
The shaft 23 is fixed at a specified position.

In this embodiment, the pressure input port
A working fluid injector (not shown) is provided for injecting a working fluid such as air, water, oil, or an inert gas into the apparatus 14, and the pressure or flow rate of the working fluid discharged from the pressure output port 16 is measured. Working fluid measuring device (not shown)
If, determination device whether the sealing of the defect and (not shown) is provided from the measurement results of the working fluid measuring device.

In the above configuration, the accommodation room 1 of the container 10
After the oil seal 19 is accommodated in the shaft 8, the shaft 23 is sequentially inserted from the shaft insertion passage 13 into the shaft insertion hole 20 of the oil seal 19 according to a command from the control device 29. Then, while the shaft 23 moves, the detected load of the load cell 25 is sequentially monitored, and it is determined whether or not the detected load is equal to a set value.

That is, when the shaft 23 moves with the tapered portion 24 of the shaft 23 in contact with the lip portion 21, the contact load between the shaft 23 and the lip portion 21 is proportional to the distance of the shaft 23 according to the movement of the shaft 23. And increase. The contact load detected by the load cell 25
When the weight becomes equal to the set value, the brake device is operated to fix the shaft 23 at the specified position.

Thereafter, a working fluid is injected from the pressure input port 14 through the fluid passage 15 into the accommodation chamber 18, and pressure is applied to the oil seal 19. In this state, the pressure or flow rate of the working fluid discharged from the pressure output port 16 is measured, and the presence or absence of a sealing defect is determined based on whether or not the measurement result is within a range of an allowable value.

As described above, according to the present embodiment, when the contact load between the shaft 23 and the lip portion 21 becomes equal to the set value, the pressure or flow rate of the working fluid is measured, and the sealing is performed based on the set value. The presence / absence of a sealing defect is determined with high accuracy even if the inner diameter of the lip 21 of each oil seal 19 to be inspected varies. can do.

Next, another embodiment of the present invention will be described with reference to FIG. The same members as those in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted .
Similarly, air, water,
Working fluid injector for injecting working fluid such as oil and inert gas
(Not shown) and a pressure output port
Measures the pressure or flow rate of working fluid discharged from port 16
Working fluid measuring device (not shown)
Judgment for judging the presence or absence of a sealing defect from the measurement results
An apparatus (not shown) is provided.

In this embodiment, the inner diameter of the lip 21 of the oil seal 19 is measured using the matrix camera 30 before the oil seal 19 is stored in the container 10. That is, the oil seal 19 is photographed by the matrix camera 30, the photographed image is subjected to image processing, and the inner diameter of the lip portion 21 is measured. Then, the measurement value is output to the control device 29. Outer diameter information on the tapered portion 24 of the shaft 23 is stored in the control device 29 in advance.
The measured value and the outer diameter of the tapered portion 24 are sequentially compared.

That is, after the oil seal 19 is accommodated in the container 10 and the shaft 23 is sequentially inserted into the shaft insertion hole 20 of the oil seal 19, the tapered portion 24 is formed.
Is compared with the inner diameter of the lip portion 21 measured by the matrix camera 30, and when the difference between the two, that is, the interference becomes a set value, the brake device (not shown) is driven to drive the shaft. 23 is fixed at a specified position. Thereafter, the working fluid is injected into the storage chamber 18 from the pressure input port 14 and the pressure by the working fluid is applied to the oil seal 19 as in the previous embodiment, and the pressure of the working fluid discharged from the pressure output port 16 or The flow rate is measured, and the presence or absence of a sealing defect is determined based on the measurement result.

Also in this embodiment, the pressure or flow rate of the working fluid is measured when the difference between the lip portion 21 and the tapered portion 24 becomes a predetermined interference, so that the inspection is performed.
Even if there is a variation in the inner diameter of the lip portion 21 of each oil seal 19 to be inspected, the presence / absence of a sealing defect can be determined with high accuracy.

[0028]

As described above, according to the present invention,
Inspect the sealing performance when the contact load between the lip of the sealing element and the shaft has reached the set value, or make sure that the difference between the inner diameter of the lip of the sealing element and the outer diameter of the taper of the shaft is constant. Since the sealability is inspected in the condition of, even if there is a variation in the inner diameter of the lip of each sealing element to be inspected, the effect that the presence or absence of the sealability defect can be accurately determined. Have.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of the present invention.

FIG. 2 is a configuration diagram showing another embodiment of the present invention.

FIG. 3 is a sectional view of a conventional example.

[Explanation of symbols]

 10 ... container 11, 52...... Upper jig 12, 53... Lower jig 13, 20 ... Shaft insertion hole14, 55 ... Pressure input port  15, 17 ... fluid passage16, 57 …… Pressure output port  18 ... accommodation room 19, 51…… Oil seal 21, 56… Lip part 22… O-ring 23, 50... Shaft 24 ... Taper part 25 ... Load cell 26 ... Piston rod 27 ... Driving device 28 ... Piston 29 ... Control device 30 ... Matrix camera54 …… Room

Claims (4)

(57) [Claims] To 1. A cyclic inserted into the accommodating chamber sealing elements Shah <br/> shift insertion hole, shuffling the tip has a tapered portion
Preparative sequentially inserted detects contact load <br/> the annular sealing lip and shafts bets elements to fix the position of the shafts bets when the detected load is equal to the set value, after the The accommodation room
Sealing element contact and injecting space to the working fluid between the shafts bets and the annular sealing element, the pressure or flow rate of the working fluid is measured, and judging whether the sealing of the defect from the measurement results Sealability inspection method. 2. A measuring an inner diameter of the lip portion of the annular sealing element, insert the annular sealing element during the subsequent storage chamber, the shaft insertion hole of the annular sealing element, tip it a tapered portion insert the shafts bets are Tsu <br/> sequentially compares the measured value of the diameter in the shafts preparative outer diameter and ripple-flop according to the amount of movement of the shafts bets, the difference therebetween is equal to the set value when in fixing the position of the shafts bets, shafts preparative an annular sealing requirements and the accommodating chamber Contact Thereafter
A method for inspecting the sealing property of a sealing element, comprising injecting a working fluid into a space between the element and a pressure or a flow rate of the working fluid, and judging the presence or absence of a sealing property defect from the measurement result. 3. A storage chamber to store an annular sealing element, said housing
Fluid communication path communicating the chamber, and a container having a shaft insertion path, has a tapered portion at the tip, inserted through the shaft insertion path of the annular sealing elements Shah <br/> shift insertion hole, and the container and shafts, which can then be, the shafts preparative sequentially inserted into the shaft insertion path or <br/> et accommodating chamber of annular sealing elements of the shaft insertion hole of the container to secure the shafts preparative specified position by Directive movement control hand stage, to detect the contact load between the lip and the shafts preparative annular sealing element, and outputs a shaft fixed command when the detected load is equal to the set value to the mobile control hand stage contact
A load measuring hand stage, the fluid communication path of the container, and shafts bets
And a determining means and the working fluid measuring means, whether the sealing of the defect from the measurement results of the working fluid measuring means for measuring the pressure or flow rate of the injected working fluid into the space between the annular sealing element An inspection device for sealing property of a sealing element, comprising: 4. A inner diameter measuring means to measure the inner diameter of the lip portion of the annular sealing element, accommodating chamber for accommodating an annular sealing element, the fluid communication path communicating to said housing chamber, and have a shaft insertion path < and br /> to container has a tapered portion at the tip, an annular sealing element of <br/> shaft insertion hole, and the shaft insertion path interpolation <br/> communication possible shafts bets of the container , the shafts preparative sequentially inserted into the shaft insertion hole of the annular sealing element of the housing chamber from the shaft insertion path of container, and movement control means to secure the shafts preparative specified position by the command, and the shaft outer diameter a measured value <br/> inner diameter measuring means sequentially compared in accordance with the movement of the shafts bets, and tightening margin measuring means for outputting a shaft fixed command when the difference between the two is equal to the set value to the movement control means , the fluid communication path of the container, and the working stream that is injected into the space between the shafts bets and the sealing element A working fluid measuring means for measuring the pressure or flow rate of the sealing property testing apparatus of the sealing element, characterized in that it comprises a determination means from the measurement results whether the sealing of the defect of the working fluid measuring means.