CN209992120U - Leakage test device in bolt hole of cylinder cover of engine cylinder body - Google Patents

Abstract

The utility model relates to an engine cylinder block jar cover bolt hole internal leakage test device comprises cylinder body top surface steel sheet, sealed cushion, leakage test bolt, cylinder body sealing member, air feeder and basin. The utility model discloses a special exhaust structure and leakage test device have solved gaseous unable exhaust problem, simultaneously through structure surface special treatment, fully guarantee the structural strength of cylinder cap leakage test bolt, guarantee that the crackle is unanimous promptly the crackle opens the seepage one-tenth unanimous with the assembly user state after applying bolt tightening power, can fully expose the seepage risk. Meanwhile, the invention belongs to the improvement application based on the traditional leakage test method, and the leakage test cost is not increased.

Description

Leakage test device in bolt hole of cylinder cover of engine cylinder body

Technical Field

The utility model relates to a leak test device leaks in engine cylinder block cylinder cap bolt hole.

Background

The single piece mass of the cylinder block in the fuel engine is the largest and accounts for more than 1/4 of the total mass of the engine. With the increasing emission legislation and fuel economy requirements, weight reduction of cylinders has become a major effort. Besides the application of new materials, the traditional thin-walled cast iron cylinder body design not only can keep the advantages of high structural strength, low cost, high power density and the like of the traditional cast iron cylinder body, but also can fully utilize the existing equipment, and reduce the early cost of putting new products, and is one of the main trends. At present, the average design wall thickness of part of new products reaches below 4mm, so that crack-shaped cold shut line casting defects generated by molten iron intersection at the bottom of a blind hole of a bolt hole of an open water jacket cylinder body can easily form a through-type micro-channel of a water jacket and the bolt hole after bolt hole machining, the defects are not easy to be perceived in early installation leakage testing, oil-water mixing can be brought in the process of long-term use, and serious faults of engine scrapping are caused.

Chinese patent CN201410780798.6 discloses an engine cylinder leakage test device, which comprises a base and a top plate, the base is provided with a workbench for placing an engine cylinder and for plugging holes on the bottom surface of the cylinder and a cylinder lateral sealing device located on two sides of the workbench, the top plate is provided with a cylinder top surface sealing device and a cylinder oblique sealing device, the cylinder lateral sealing device, the cylinder top surface sealing device and the cylinder oblique sealing device, the top of a push rod is provided with a plug for plugging holes on the cylinder, the cylinder can be tested for leakage rapidly, but the device aims at performing rapid conventional leakage test on the cylinder on a production line, the device for checking the problem of casting defects at the bottom hole of the cylinder bolt is not provided, and the identification and checking of fine cracks of the cylinder bolt hole can not be realized.

Chinese patent CN103033386A discloses a middle leakage tester for an engine cylinder block, which comprises an equipment frame, a variable-pitch roller way mechanism horizontally penetrating the lower part of the equipment frame and used for conveying the engine cylinder block to be tested, and a double-blocking mechanism arranged on the variable-pitch roller way mechanism and used for limiting the engine cylinder block to be tested; a liftable positioning base plate is arranged between the variable-pitch roller mechanisms, and a first plugging part for positioning and plugging the parting surface of the bottom of the engine cylinder to be detected is arranged on the positioning base plate; the device frame is provided with an upper pressure plate which can be lifted and is positioned above the positioning substrate, and the two sides of the upper pressure plate are provided with a left clamping and plugging tool and a right clamping and plugging tool which are used for clamping the cylinder body of the engine to be detected.

Chinese patent CN202420369U discloses a cylinder body leakage test detection mechanism, including the leading truck, conveyer, arch frame, elevating gear and leakage test anchor clamps, the leading truck is the T type, connect two transverse guide that longitudinal guide one end just set up relatively including a longitudinal rail and perpendicularly, conveyer installs on the leading truck, move on longitudinal rail and transverse guide for drive leakage test anchor clamps, arch frame erects in the longitudinal rail top, elevating gear installs in arch frame, leakage test anchor clamps include the punch holder and correspond with punch holder complex lower plate, punch holder detachably installs on elevating gear in order to go up and down through the elevating gear drive, the lower plate is installed on longitudinal rail and is moved through the conveyer drive, the lower plate is waited the cylinder body that the leakage test detected with the punch holder and is detected in order to carry out the leakage test.

However, the system and mechanism disclosed in the above patent aim at performing quick routine leakage test on the cylinder on the production line, and cannot realize the identification and inspection of the fine cracks of the cylinder bolt holes.

Disclosure of Invention

An object of the utility model is to above-mentioned prior art not enough, provide an engine cylinder body jar cover bolt hole internal leakage test device, solve the thin wall cast iron cylinder body because the casting defect leads to the inside leakage inspection problem of jar cover bolt blind hole on the cylinder body, can realize the inside casting defect leakage inspection of bolt hole that current leakage test means can't be investigated, the inspection operation of the inside seepage of all cast iron cylinder body bolt holes on the generally applicable market.

The utility model aims at realizing through the following technical scheme:

the leakage test device in the bolt hole of the cylinder cover of the engine cylinder body consists of a steel plate on the top surface of the cylinder body, a sealing rubber mat, a leakage test bolt, a cylinder body sealing element, an air supply device and a water tank.

The air supply device is connected with an unblocked open hole of the water jacket of the cylinder body to be tested for leakage through a water pipe;

the sealing rubber pad, the cylinder body top steel plate and the leakage testing bolt are sequentially arranged on the plug on the upper surface of the cylinder body;

the whole body of the cylinder body to be tested is arranged in the water tank, and the steel plate on the top surface of the cylinder body and all the leak testing bolts are positioned about 10mm below the water surface.

The cylinder body top surface steel plate is made by 8 mm's of thickness steel sheet, bears bolt tightening force and compresses tightly sealed cushion. The thickness of the sealing rubber gasket is 3mm, and the sealing rubber gasket is made of transparent rubber gaskets and provides sealing capability; the leakage testing bolt is formed by modifying an original bolt, and the bolt axial force which is the same as the actual assembly state is provided through heat treatment to ensure that the stress state of the crack is the same as the actual installation state. Meanwhile, the axle center of the bolt is provided with a phi 3 through hole which is coaxial with the bolt and penetrates through the axis of the bolt, so that compressed gas can be smoothly discharged to generate bubbles when the bolt hole leaks. The cylinder body sealing piece is used for plugging the water jacket open holes except the air supply hole, and the air supply device can provide compressed air with continuous pressure of more than 2bar for the sealed water jacket; the whole cylinder body to be tested which is communicated with the compressed air is soaked in the water tank for containing water, so that the air leakage is ensured to float out of the water surface in a bubble form, and the observation is convenient.

Compared with the prior art, the beneficial effects of the utility model reside in that: at present, the conventional method for cylinder leakage testing is to plug main holes of a water jacket of a cylinder body, then introduce 2bar compressed air into the cylinder body after plugging, observe the pressure maintaining condition, if leakage is obvious, dig and cut the cylinder body after primarily judging the leakage position, scan the defect position by using industrial CT and analyze the cause of the defect. Because the length of the screwing of the cylinder body bolt is long, the generated labyrinth seal effect causes that the leaked gas cannot be discharged, the gas pressure is reduced a little, and the method is often in no way to overcome the defects. The utility model discloses a special exhaust structure and leakage test device have solved gaseous unable exhaust problem, simultaneously through structure surface special treatment, fully guarantee the structural strength of cylinder cap leakage test bolt, guarantee that the crackle is unanimous promptly the crackle opens the seepage one-tenth unanimous with the assembly user state after applying bolt tightening power, can fully expose the seepage risk. Meanwhile, the invention belongs to the improvement application based on the traditional leakage test method, and the leakage test cost is not increased.

Drawings

Fig. 1 is the utility model discloses the schematic diagram of leak test device in the engine cylinder block cylinder cap bolt hole.

In the figure, 1, a leakage testing bolt 2, a cylinder body top surface steel plate 3, a through hole inner wall 4 and a sealing rubber gasket.

Detailed Description

The invention will be further described with reference to the following examples:

the utility model discloses leak test device in engine cylinder block cylinder cap bolt hole comprises cylinder body top surface steel sheet 2, sealed cushion 4, leak test bolt 1, cylinder body sealing member (not embodied in the figure), air feeder (not embodied in the figure) and basin (not embodied in the figure). The structure of the device can effectively perform leakage test and oil-water mixing fault troubleshooting work before a single-piece loading machine aiming at the problem.

Cylinder body top surface steel sheet 2 is made by thickness 8 mm's steel sheet, and is difficult for bending deformation for formal cylinder cap in the conventional leakage test of replacement provides the function that compresses tightly, can reduce the length of leakage test bolt by a wide margin after the replacement, reduces the drilling length of leakage test bolt through-hole, is convenient for simultaneously observe and judge leakage test in-process bubble production position. The thickness of the sealing rubber gasket 4 is 3mm, the sealing rubber gasket is made of transparent rubber gaskets, and the size hole position of the sealing rubber gasket is similar to that of an engine cylinder gasket and is used for providing a sealing effect between the top surface of the cylinder body and the steel plate 2 on the top surface of the cylinder body. The leakage testing bolt 1 is formed by modifying an original bolt, the modification needs to ensure that the screwing length of the leakage testing bolt is the same as the mounting state of a formally screwed bolt, and the bolt provides the bolt axial force which is the same as the actual assembly state through heat treatment so as to ensure that the stress state of a crack is the same as the actual mounting state. Meanwhile, the axle center of the bolt is provided with a phi 3 through hole coaxial with the bolt, the bolt passes through the axis of the bolt, the inner wall 3 of the through hole needs to be subjected to necessary fine grinding process treatment, the bolt is ensured not to be broken under the tightening force to cause cylinder body scrapping, and the through hole can ensure that leaked gas can be smoothly discharged to generate bubbles when the bolt hole of the cylinder body has leakage. The cylinder body sealing piece is used for plugging the water jacket open holes except the air supply hole, and the air supply device can provide compressed air with continuous pressure of more than 2bar for the sealed water jacket; the whole cylinder body to be tested which is communicated with the compressed air is soaked in the water tank for containing water, so that the air leakage is ensured to float out of the water surface in a bubble form, and the observation is convenient. The cylinder seal and the gas supply are conventional universal tools and are not described in detail.

The utility model discloses a detailed working process:

firstly, a specially-made plugging clamp or an original part is used for plugging all water jacket open holes of a cylinder body to be tested, only one water pipe is reserved for connecting a gas supply device and providing 2bar constant-pressure compressed gas, a sealing rubber mat 4, a cylinder body top surface steel plate 2 and a test leak bolt 1 are sequentially installed on the plugging of the upper surface of the cylinder body and screwed down according to the torque required by the assembly and adjustment specification, the cylinder body to be tested is integrally placed in a water tank after the gas supply device is connected, and the cylinder body top surface steel plate 2 and all the test leak bolts 1 are guaranteed to be located about 10mm below the water surface. And finally, introducing compressed air, wherein the pressure of the compressed air is 2bar, continuously observing for more than 10 minutes, and obtaining the bolt hole with bubbles continuously emerging as a leakage bolt hole.

Claims (4)

1. The utility model provides an engine cylinder block cylinder cap bolt hole internal leakage test device which characterized in that: the device comprises a leakage testing bolt (1), a cylinder top steel plate (2), a sealing rubber gasket (4), a cylinder sealing element, an air supply device and a water tank;

the air supply device is connected with an unblocked open hole of the water jacket of the cylinder body to be tested for leakage through a water pipe; the sealing rubber gasket (4), the cylinder top steel plate (2) and the leakage testing bolt (1) are sequentially arranged on the upper surface of the cylinder body for sealing; the whole body of the cylinder body to be tested is arranged in the water tank, and the steel plate on the top surface of the cylinder body and all the leak testing bolts (1) are positioned 10mm below the water surface; the air supply device can supply compressed air to the water cavity of the sealed cylinder body.

2. The device of claim 1 for leak testing in a bolt hole of a cylinder head of an engine cylinder, wherein: the cylinder body top surface steel plate (2) is made of a steel plate with the thickness of 8mm, bears bolt tightening force and compresses the sealing rubber gasket (4).

3. The device of claim 1 for leak testing in a bolt hole of a cylinder head of an engine cylinder, wherein: the thickness of the sealing rubber pad is 3mm, and the sealing rubber pad is made of a transparent rubber pad.

4. The device of claim 1 for leak testing in a bolt hole of a cylinder head of an engine cylinder, wherein: the leakage testing bolt (1) is formed by modifying an original bolt and provides a bolt axial force which is the same as the actual assembly state through heat treatment; the shaft center of the leakage testing bolt (1) is provided with a phi 3 through hole which is coaxial with the bolt, the axis of the bolt penetrates through the axis of the bolt, and the inner wall (3) of the through hole is finely ground.

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