JPH0574015B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a sealing jig for hydraulic testing. More specifically, the present invention relates to a sealing jig for hydraulic testing that can seal both end joint fittings of a brake hose having joint fittings attached to both ends. [Prior Art] Brake hoses for automobiles are important safety parts. This type of brake hose is rarely sold as a single rubber hose, and is usually sold with fittings attached to both ends of the brake hose for ease of installation on the car and connection reliability. ing. The fittings to be attached to both ends of the brake hose are female fittings 2 and 4 as shown in Figure 3.
A male metal fitting 3 as shown in the figure is often used. In the case of the female joint fitting 2 as shown in Fig. 3, 2a
2b is a socket part, 2c is a flange part, and 2d is a coupling part. The end of the hose 1 is inserted between the nipple tube 2a and the socket section 2b, and is attached by crimping the socket section 2b. Similarly, the male fitting 3 as shown in Fig. 4 has a nipple portion 3a, a socket portion 3b, and a socket portion 3c.
is the flange part, and 3d is the connecting part. Brake hoses with fittings attached to both ends of the brake hoses are being produced in units of tens of thousands to hundreds of thousands of pieces per month as the production and number of automobiles in stock increases. All brake hoses with fittings that are produced undergo a pressure test before being packaged and shipped. Therefore, these pressure tests are performed tens of thousands to hundreds of thousands of times per month. Therefore, the productivity of a brake hose with fittings attached to both ends is largely influenced by the speed of attaching the fittings to both ends and the speed of the pressure test. Pressure tests for brake hoses are usually conducted using water pressure tests assuming a hydraulic circuit. FIG. 5 is an explanatory diagram of a brake hose pressure test device with fittings attached to both ends. In FIG. 5, 36 is a water pressure pump,
The high-pressure water flow generated by this water pressure pump 36 is sent through a water pressure valve 37 and water pressure piping 38 into the brake hose 1, which is set in seal jigs 39 and 39' and has fittings attached to both ends. ing. In the pressure test time for a brake hose with fittings attached to both ends, excluding the pressure application time, the time for setting it into the sealing jig 39 and the time for removing it account for a large proportion. Therefore, the sealing jig 39 used is one that can quickly and easily set and remove the end fittings of a brake hose with fittings attached to both ends, and has excellent sealing properties. FIG. 6 shows an enlarged cross-sectional view of a conventional sealing jig 39. In FIG. 6, 1 is a brake hose, 2 is an end fitting fixed to the end of the brake hose 1, 5 is a seal chip, 41 is a seal cylinder, 42 is a seal piston, 44 is an O-ring,
25 is an air piston, 26 is an air cylinder, 33 is an air switching valve, 34 is a pressure welding air pipe sent from a compressor (not shown), 35 is a return air pipe sent from a compressor (not shown), 25 is not shown This is the water pressure piping sent from the water pressure pump. That is, the air switching valve 33 is operated to supply high-pressure air to the return air piping 35, and the seal piston 42 is moved leftward toward the drawing to open it. Next, this opened sealing jig 39, 39'
Attach the terminal fittings 2 of the brake hose 1 with fittings attached to both ends to be tested, then operate the air switching valve 33 to supply high pressure air to the pressure welding air piping 34, and connect the seal piston 42.
Press and seal in the right direction toward the drawing. Finally, high pressure water sent from a water pressure pump (not shown) is passed through the water pressure piping 38, the high pressure water supply port 43, the pressurizing chamber 47, the cylinder waterway 46, the tip waterway 7, and the fitting 2 into the brake hose 1 to be tested. to be applied. After applying water pressure for a predetermined period of time, the water pressure switching valve (not shown) is stopped, and then the air switching valve 33 is turned off.
, enter high pressure air into the return air piping 35, move the seal piston 42 to the left toward the drawing, and open it. Hereafter, these operations are repeated in the same manner. Now, the shapes and dimensions of the joint fittings at both ends vary depending on the specifications, but in many cases, the shapes and sizes are the same and the sizes are different. Therefore, in order to perform a pressure test on a brake hose 1 with end fittings of different sizes using conventional pressure test equipment, it is necessary to replace the sealing jigs 39, 39' in advance with ones that match the sizes of the end fittings. I needed to do it. For this reason, the sealing jig 39,
39' replacement work was a factor that reduced testing efficiency. Moreover, the terminal joint fittings 2 have different dimensions.
When the end joint fitting 2 of the brake hose 1, which has been attached, is repeatedly pressed against the seal chip 5, the seal chip 5 is pushed by the tip of the threaded portion 2d of the end joint fitting 2 , causing deformation and damage. The degree of deformation and damage to the seal chip 5 increases as the inner diameter and wall thickness of the end joint fitting 2 decrease. For this reason, the seal chip 5 needs to be replaced periodically, which has been a major factor in reducing the test efficiency of the pressure test. [Problems to be Solved by the Invention] The present invention has been made based on the above points, and its purpose is to eliminate the drawbacks of the prior art mentioned above, and to provide a terminal fitting with different dimensions. To provide a sealing jig for a hydraulic test, which can significantly reduce deformation and damage to a seal chip even when an end joint fitting of a brake hose is repeatedly pressed against the seal chip, and as a result can greatly improve test efficiency. [Means for Solving the Problems] The gist of the present invention is that a cylinder waterway is opened along the axis center line direction so as to be continuous with the seal waterway of the seal chip, and the outer shape is tapered and the taper is not tapered. A seal piston is formed with a plurality of stepped grooves whose diameter gradually decreases toward the tip of the surface, and an opening groove whose diameter increases in the opposite direction to correspond to the tapered surface of the seal piston. A water pressure system characterized in that a plurality of pressurizing chambers are provided along the opening groove surface of the dovetail by a plurality of stepped grooves of the seal piston and a sill cylinder provided with corresponding stepped grooves. It is in the test seal jig. [Function] The sealing jig for water pressure testing of the present invention has a plurality of pressurizing chambers in which the water pressure applied to the sealing chip differs in stages by a specially shaped seal piston and seal cylinder, and thereby the brake to which the joint fitting is attached is installed. The purpose is to prevent excessive water pressure from being applied when the hose fitting is set in a sealing jig and a pressure test is performed. As a result, the seal jig for water pressure testing of the present invention can effectively reduce deformation and damage to the seal chip even if the seal chip is repeatedly applied to the end joint fittings of the brake hose with end fittings of different sizes. This can greatly improve testing efficiency. That is, in the sealing jig for hydraulic pressure testing of the present invention, the cylinder waterway is opened along the axial center line so as to be continuous with the sealing waterway of the seal chip, and the outer shape is tapered and the shape is directed toward the tip of the tapered surface. A seal piston is formed with a plurality of stepped grooves whose diameters gradually decrease, and an opening groove whose diameter increases in the opposite direction corresponds to the tapered surface of the seal piston. A plurality of pressurized chambers in which the water pressure applied to the seal tip differs in stages are created by a plurality of step-like grooves of the seal piston and a seal cylinder provided with corresponding step-like grooves along the seal piston. Here, the water pressure applied to the seal tip becomes smaller as the pressure chamber is created closer to the tip of the tapered surface of the seal piston, and conversely becomes larger as the pressure chamber is created at a position where the diameter of the taper surface of the seal piston becomes larger. Therefore, when performing a pressure test on a brake hose fitting with a small inner diameter and thin wall fitting installed in a sealing jig, the applied water pressure generated at the tip of the tapered surface of the seal piston is Apply high water pressure from a small pressurized chamber. On the other hand, when performing a pressure test by setting the joint fittings of a brake hose that has joint fittings with a large inner diameter and thick wall on both ends in a sealing jig, the position where the diameter of the tapered surface of the seal piston becomes large is High water pressure is applied from a pressurized chamber that generates a large amount of water pressure. [Example] Next, an example of the seal jig for hydraulic testing of the present invention will be described with reference to the drawings. FIG. 1 is an enlarged cross-sectional explanatory diagram showing one embodiment of the sealing jig for hydraulic pressure tests of the present invention, and FIG. 2 is an enlarged cross-sectional explanatory diagram showing another embodiment of the sealing jig for hydraulic pressure tests of the present invention. It is a diagram. 1 and 2, 1 is a brake hose with fittings attached to both ends, 2 is an end fitting fixed to the end of the brake hose 1, 5 is a seal tip, 9, 10, 11, 12, 13 ,14
is an O-ring, 25 is an air piston, 26 is an air cylinder, 33 is an air switching valve, 32
25 is a high-pressure air pipe sent from a compressor (not shown), and a water pressure pipe 25 is sent from a water pressure pump (not shown). In FIGS. 1 and 2, 6 is a seal piston having a tapered shape and having a plurality of step-shaped grooves whose diameter gradually decreases toward the tip of the tapered surface; 4 is a seal piston 6; A seal comprising an opening groove whose diameter increases in the opposite direction so as to correspond to the tapered surface, and a stepped groove formed along the opening groove surface so as to correspond to a plurality of stepped grooves of the seal piston 6. It is a cylinder. The seal piston 6 and the seal cylinder 4 face each other with a plurality of stepped grooves to form pressurized chambers 21, 22, 23, and 24 to which high-pressure water can be applied. In FIG. 1, 15, 16, 17, and 18 are high-pressure water supply ports that feed high-pressure water to pressurized chambers 21, 22, 23, and 24. High pressure water supply port 15, 16, 1
High-pressure water is supplied to 7 and 18 by sending high-pressure water from a water pressure pump (not shown) through water pressure piping 25, water pressure switching valves 26, 27, 28, and the like. Now, the water pressure applied to the seal chip 5 is lowest when applied from the high-pressure water supply port 18, higher when applied from the high-pressure water supply port 17 than when applied from the high-pressure water supply port 18, and when applied from the high-pressure water supply port 16. It is larger when applying water from the high-pressure water supply port 17, and furthermore, when applying water from the high-pressure water supply port 15, it is larger than when applying from the high-pressure water supply port 16. Therefore, when the diameter of the fitting 2 is small, high pressure water is supplied from the supply port 18 to reduce the water pressure applied to the seal chip 5. On the other hand, when the diameter of the fitting 2 is large, high pressure water is supplied 18 and 1 to increase the water pressure applied to the seal chip 5.
Supply from 5. Another embodiment of the sealing jig for hydraulic pressure testing of the present invention shown in FIG. 2 shows an example in which there are three pressurizing chambers, and its configuration is the same as that of the sealing jig for hydraulic pressure testing shown in FIG. 1. The same is true. [Effects of the invention] The sealing jig for hydraulic testing of the present invention can be selected according to the diameter of the connecting part of the brake hose with fittings attached to both ends to be sealed. As a result, the durability of the seal chip of the seal jig for hydraulic testing can be significantly improved, and it is industrially useful.

[Brief explanation of drawings]

FIG. 1 is an enlarged cross-sectional explanatory diagram showing one embodiment of the sealing jig for hydraulic pressure tests of the present invention, and FIG. 2 is an enlarged cross-sectional explanatory diagram showing another embodiment of the sealing jig for hydraulic pressure tests of the present invention. Fig. 3 is an enlarged vertical cross-sectional explanatory view of the hose end portion with the female type fitting 2 attached, Fig. 4 is an enlarged longitudinal cross-sectional explanatory view of the hose end portion with the male type fitting 4 attached, and Fig. 5 is an explanatory enlarged longitudinal cross-sectional view of the hose end portion with the female type fitting 2 attached. FIG. 6 is an explanatory diagram of a pressure test device for a brake hose with a joint fitting attached to the end thereof, and FIG. 6 is an explanatory enlarged cross-sectional diagram of a conventional sealing jig 39. 1...Hose, 2 ...Female joint fitting, 2a...
...Nipple part, 2b...Socket part, 2c...Flange part, 2d...Matching part, 3 ...Male metal fitting,
3a...Nipple part, 3b...Socket part, 3c
...Flange portion, 3d...Connecting portion, 4...Seal cylinder, 5...Seal tip, 6...Seal piston, 7...Tip waterway, 8, 46...Cylinder waterway, 9, 10, 11, 12 ,13,1
4,44,45...O-ring, 15,16,1
7, 18, 43...High pressure water supply port, 19, 20...
...Air supply port, 21, 22, 23, 24, 47
...pressure chamber, 25... air piston, 26...
Air cylinder, 32...High pressure air piping, 3
3... Air switching valve, 34... Air piping for pressure welding, 35... Air piping for return, 36... Water pressure pump, 37, 40... Water pressure valve, 38... Water pressure piping, 39... Seal jig, 41...Seal cylinder, 42...Seal piston, 43...High pressure water supply port.

Claims (1)

[Claims] 1. A seal chip 5 having a seal waterway 7 opened along the axial center line of both end joint fittings of the brake hose with a smooth sealing surface, a seal piston 6 that pressurizes the seal chip 5, and a seal cylinder. 4, the seal piston 6 has a tapered outer shape, and a plurality of stepped grooves whose diameters gradually decrease toward the tip of the tapered surface are spaced at predetermined intervals. A cylinder waterway 8 is formed and is opened along the axial center line direction to connect to the seal waterway 7, and the diameter of the seal cylinder 4 gradually increases so as to correspond to the tapered surface of the seal piston 6. 1. A sealing jig for hydraulic pressure testing, characterized in that it has an opening and step-like grooves are provided at positions corresponding to the plurality of step-like grooves of the seal piston 6 along the opening.