Cylinder body leakage test detection mechanism and method for replacing leakage test clamp

Abstract

The invention discloses a cylinder block leakage test detection mechanism and a method for replacing a leakage test clamp, and relates to the technical field of engine cylinder block detection. Comprising positioning assemblies installed in a cylinder cover spiral groove in the top of a cylinder body, a leakage testing assembly is slidably installed outside the positioning assemblies and used for sealing cylinder bores in the cylinder body, the positioning assemblies are laid and installed on the top of the cylinder body based on the number of the cylinder bores in the cylinder body, and a barometer and an air injection cylinder are installed on the tops of any two positioning assemblies respectively. The cylinder body, the positioning assembly, the leakage testing assembly and an oil pan installed at the bottom of the cylinder body form a first sealed space, and the first sealed space applies pressure based on the gas injection cylinder and displays the pressure in the gas pressure meter. According to the invention, the positioning assembly and the leakage test assembly are arranged at the top or the bottom of the cylinder body, so that the cylinder body can be subjected to quick leakage test detection without completely disassembling the engine cylinder body, a repairer can quickly judge the leakage problem of an engine, the time is saved, and the maintenance efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of engine cylinder detection, in particular to a cylinder leak detection mechanism and a method for replacing a leak test fixture. Background Art

[0002] During engine operation, the cylinder block is one of the key components, and its sealing performance directly affects the normal operation of the engine.

[0003] The Chinese utility model patent with publication number "CN217032906U" discloses "an automobile engine cylinder leak tester". The engine cylinder leak tester proposed in this application can be incorporated into the automobile engine cylinder production line, so that the product can complete the leak test without going offline. It has strong reliability and reduces the product offline leak test link, thereby reducing the process of handling and loading and unloading workpieces. It not only reduces labor intensity and improves work efficiency, but also effectively avoids the occurrence of bumps and other phenomena caused during the transportation process.

[0004] The Chinese utility model patent with publication number "CN212432451 U" discloses "a portable leak test device for automobile engine cylinder head valve guide". This application realizes the movement and connection of the device by moving the leak tester to the test site and then inserting the air pipe into the joint on one side of the base. It can be used at any time, which is simple and convenient, avoiding the need to move the valve guide to be tested back and forth, which is more labor-saving.

[0005] However, in small automobile repair shops, due to the lack of advanced electronic testing equipment, the engine cylinder block needs to be disassembled when performing a sealing test on the engine cylinder block. However, the above two disclosed devices are not applicable in this scenario. In addition, small repair shops usually have limited space and lack the conditions to incorporate leak testers into production lines. Therefore, it is necessary to design a portable manual cylinder leak detection mechanism. Summary of the invention

[0006] The object of the present invention is to provide a cylinder leak test detection mechanism and a method for replacing a leak test fixture to solve the problems raised in the above background technology.

[0007] In the first aspect, in order to achieve the above-mentioned purpose, the present invention provides the following technical solution: a cylinder leak detection mechanism, comprising:

[0008] The positioning assembly is installed in the cylinder head screw groove on the top of the cylinder block;

[0009] A leak test assembly is slidably mounted outside the positioning assembly and is used to seal the cylinder bore in the cylinder body;

[0010] The positioning assembly is installed on the top of the cylinder body based on the cylinder bore in the cylinder body, and a pressure gauge and an air injection cylinder are respectively installed on the top of any two positioning assemblies;

[0011] The cylinder body, the positioning assembly, the leak test assembly and the oil pan installed at the bottom of the cylinder body constitute a first sealed space. The first sealed space is pressurized by the gas injection cylinder and displayed in the pressure gauge.

[0012] As a further preferred embodiment of the present technical solution, a positioning assembly is laid out and installed in the cylinder head screw groove outside the two piston positions in the cylinder bore, a leak test assembly is arranged in the cylinder bore corresponding to the piston position, and a pressure gauge and an air injection cylinder are respectively installed on the top of the two positioning assemblies.

[0013] As a further preferred embodiment of the present technical solution, the positioning assembly is installed on the bottom of the cylinder body based on the number of cylinder bores in the cylinder body, and a pressure gauge and an air injection cylinder are installed on the top of any two positioning assemblies respectively;

[0014] The cylinder body, the positioning assembly, the leak test assembly, the cylinder head installed on the top of the cylinder body, and the valve cover assembly installed on the top of the cylinder head constitute a second sealed space. The second sealed space is pressurized by the gas injection cylinder and displayed in the pressure gauge.

[0015] As a further preferred embodiment of the present technical solution, the positioning component includes:

[0016] A positioning rod, the end of which is provided with a threaded section, a screw sleeve is fixed to the positioning rod at a position away from the threaded section, a locking nut is threadedly installed on the outside of the screw sleeve, a bearing sleeve is rotatably connected to the top of the locking nut, and the bearing sleeve is sleeved outside the screw sleeve.

[0017] As a further preferred embodiment of the present technical solution, the leak test assembly comprises:

[0018] A sealing cover, one side of which is provided with a fitting sleeve for inserting into the cylinder bore, and the fitting sleeve can be replaced based on the specifications of the cylinder bore;

[0019] A flow guide tube is fixed on the top of the sealing cover, and the flow guide tube is connected to the interior of the fitting sleeve;

[0020] The outside of the flow guide tube is threadedly connected to a sliding spiral tube, and a connecting valve head is fixed on the top of the flow guide tube, and the connecting valve head is used to install any one of a pressure gauge and an air injection cylinder;

[0021] A connecting piece is installed on the bottom surface of the sliding spiral tube, and one end of the connecting piece is installed outside the bearing sleeve.

[0022] As a further preferred embodiment of the present technical solution, the connecting member includes: a slide rail arm, the top of one end of the slide rail arm is movably connected to the bottom surface of the sliding screw tube, and the other end of the slide rail arm is equipped with a locking clamp, which is used for fastening and installing outside the bearing sleeve.

[0023] In the second aspect, in order to improve the above technical solution, the present invention further provides the following technical solution: a method for replacing a leak test fixture, which is applied to all positioning components and leak test components disclosed in the above cylinder leak test detection mechanism, and includes:

[0024] Step 1: Turn off the air source of the air injection cylinder to release the pressure in the cylinder to a safe level;

[0025] Step 2: Loosen the locking nut and rotate the bearing sleeve to release the locking state of the positioning rod;

[0026] Step 3: Take out the positioning rod from the screw groove and the leak test assembly at the same time;

[0027] Step 4: Replace the new leak test assembly to ensure that the fitting sleeve matches the cylinder bore specifications;

[0028] Step 5: Insert the replaced leak test assembly into the cylinder bore and reinsert the positioning rod into the screw groove;

[0029] Step 6: Tighten the locking nut to ensure that the positioning rod is firmly fixed in the screw groove;

[0030] Step 7: Run the air injection cylinder to perform a leak test on the cylinder body and observe the reading of the air pressure gauge to confirm whether the sealing performance of the cylinder body meets the requirements.

[0031] As a further preferred embodiment of the present technical solution, after completing step seven, the pressure data shown on the barometer is obtained and recorded, the pressure data is compared with the manufacturer's preset standard pressure value of the cylinder body, and the comparison result is obtained, and based on the comparison result, the sealing performance of the cylinder body is obtained.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] A cylinder leak detection mechanism and a method for replacing a leak test fixture, by arranging a positioning component and a leak test component on the top or bottom of the cylinder body, can perform a rapid leak test on the cylinder body without completely disassembling the engine cylinder body, so that a repairman can quickly identify engine leakage problems, saving time and improving maintenance efficiency.

[0034] In addition, the setting of the positioning component ensures that the leak test component can accurately seal the cylinder bore, and the coordinated use of the pressure gauge and the air injection cylinder makes the detection process more intuitive and convenient;

[0035] It should also be noted that the method for replacing the leak test fixture proposed in the present invention allows for rapid replacement if the leak test component is found to be damaged or does not meet specifications during the detection process, thereby ensuring the continuity and accuracy of the detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is the first assembly diagram of the present invention;

[0037] Figure 2 is a second assembly diagram of the present invention;

[0038] Figure 3 It is a structural composition diagram of the positioning component of the present invention;

[0039] Figure 4 It is an assembly diagram between the leak test component and the positioning component of the present invention;

[0040] Figure 5 It is a structural composition diagram of the leak test component of the present invention.

[0041] In the figure: 1. cylinder block; 2. cylinder head screw groove; 3. positioning assembly; 301. positioning rod; 302. bearing sleeve; 303. locking nut; 304. threaded section; 305. screw sleeve; 4. pressure gauge; 5. leak test assembly; 501. sealing cover; 502. fitting sleeve; 503. slide rail arm; 504. locking clamp; 505. connecting valve head; 506. sliding screw pipe; 507. guide pipe; 6. air injection cylinder; 7. crankshaft groove; 8. oil pan screw groove. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] Before discussing the innovative technical solution proposed by the present invention in depth, it is necessary to first understand some background information in the automobile repair industry. In small automobile repair shops, for the sealing detection of the engine cylinder block, due to the lack of advanced electronic detection equipment, repair personnel usually need to adopt a more traditional method to perform leak testing. This method involves disassembling the cylinder block 1 in the automobile engine and placing it in a water tank for testing. However, this traditional detection method is not only inefficient, but also has great limitations in judging the sealing performance of the cylinder block 1, and cannot provide accurate detection results.

[0044] Embodiment 1: When a leak test is required on the engine block, the engine needs to be disassembled from the top first. Specifically, this includes removing the cylinder head and valve cover assembly on the top of the engine block. During this process, the repairman will perform a leak test on the cylinder block 1.

[0045] As reference Figure 1 As shown, in this implementation scenario, the cylinder leak detection mechanism mainly includes the following parts: a positioning component 3, which is installed in the cylinder head screw groove 2 on the top of the cylinder body 1, a leak test component 5, which can be slidably installed on the positioning component 3 and is used to seal the cylinder bore in the cylinder body 1, and the positioning component 3 is laid and installed on the top of the cylinder body 1 according to the number of cylinder bores in the cylinder body 1. In addition, a pressure gauge 4 and an air injection cylinder 6 are respectively installed on the top of any two positioning components 3.

[0046] It should be clear that in this scenario, the cylinder body 1, the positioning assembly 3, the leak test assembly 5 and the oil pan installed at the bottom of the cylinder body 1 together constitute a first sealed space, and pressure can be applied to this first sealed space through the air injection cylinder 6, and the pressure change will be displayed by the pressure gauge 4.

[0047] Specifically, in this embodiment, by using the above-mentioned cylinder leak test detection mechanism, the cylinder 1 is effectively tested for sealing. First, the cylinder 1 is placed in an appropriate position and ensure that the positioning assembly 3 is correctly installed in the cylinder head screw groove 2. Then, the leak test assembly 5 is slidably installed on the positioning assembly 3 and ensure that it can seal the cylinder bore in the cylinder 1. Next, pressure is applied to the first sealed space through the air injection cylinder 6, and the reading changes of the pressure gauge 4 are observed. If the pressure displayed by the pressure gauge 4 remains stable, it can be judged that the sealing performance of the cylinder 1 is good. If the pressure drops, it indicates that there is a leakage problem in the cylinder 1. In this way, the repair personnel can accurately judge the sealing performance of the cylinder 1, thereby improving the efficiency and accuracy of the maintenance work.

[0048] Embodiment 2. As a supplement to Embodiment 1, when Embodiment 1 is actually in operation, it should be noted that, when Embodiment 1 is in operation, since the piston is arranged inside the cylinder bore, the positions of two corresponding pistons in the engine can be changed by rotating the crankshaft during a leak test. For example, when maintaining an inline four-cylinder engine, the piston-connecting rod assembly installed on the crankshaft is arranged from left to right by rotating the crankshaft. The first piston-connecting rod assembly and the third piston-connecting rod assembly reach the bottom dead center in the cylinder bore at the same time. At this time, the second piston-connecting rod assembly and the fourth piston-connecting rod assembly reach the top dead center in the cylinder bore, and the surface of the piston is aligned with the top plane of the cylinder body 1.

[0049] It should be clarified that in the scenario of Example 2, the positioning component 3 is laid and installed in the cylinder head screw groove 2 outside the cylinder bore of the cylinder body 1 corresponding to the two piston positions, the leak test component 5 is arranged in the cylinder bore corresponding to the piston position, and the top of the two positioning components 3 are respectively installed with a pressure gauge 4 and an air injection cylinder 6.

[0050] Specifically, in this embodiment, by adjusting the position of the crankshaft and ensuring that the piston-connecting rod assembly is in a specific detection position, the accuracy of the leak test can be further improved. When the piston-connecting rod assembly is at the bottom dead center, the volume of the space in the cylinder 1 is the smallest. At this time, pressure is applied. If the pressure displayed by the barometer 4 can remain stable, the sealing performance of the cylinder 1 in the minimum volume state can be confirmed. Conversely, if the pressure drops, it means that there is a leakage problem in the cylinder 1 in the minimum volume state. In this way, maintenance personnel can more accurately evaluate the sealing performance of the cylinder 1 to ensure the performance and reliability of the engine.

[0051] Embodiment 3: When the age of a car is about 10 years and the mileage is high, there is a certain degree of risk in removing the top accessories of the engine due to the aging of the internal engine parts and multiple plug-ins. Therefore, this embodiment performs a leak test by removing the oil pan at the bottom of the engine.

[0052] It should be clear that reference Figure 2 It can be seen that in this embodiment, the positioning assembly 3 is laid and installed on the bottom of the cylinder body 1 based on the number of cylinder bores in the cylinder body 1, and the tops of any two positioning assemblies 3 are respectively installed with a pressure gauge 4 and an air injection cylinder 6. The cylinder body 1, the positioning assembly 3, the leakage test assembly 5, the cylinder head installed on the top of the cylinder body 1, and the valve cover assembly installed on the top of the cylinder head constitute a second sealed space. The second sealed space is pressurized based on the air injection cylinder 6 and displayed in the pressure gauge 4.

[0053] Specifically, in this embodiment, by removing the oil pan, maintenance personnel can more directly contact the bottom of the cylinder body 1 of the engine, so as to conduct a more direct and comprehensive sealing test. First, the car is stably placed on the maintenance lift and the maintenance lift is locked, and then the oil pan is removed to expose the bottom of the cylinder body 1. Then, according to the method described in the first embodiment, the positioning component 3 and the leak test component 5 are installed, and pressure is applied in the second sealed space. The pressure change is monitored by the barometer 4. If the pressure remains stable, it indicates that the sealing performance of the bottom of the cylinder body 1 is good; if the pressure drops, it indicates that there is a leakage problem. Through this bottom detection method, even if the engine is used for a long time and the internal parts are aged, the sealing performance of the engine can be effectively evaluated and ensured, thereby providing a more accurate basis for maintenance work.

[0054] To supplement, in the present invention, the positioning assembly 3 is composed of the following parts: a positioning rod 301, a threaded section 304 is provided at the end of which, the positioning rod 301 is fixed with a screw sleeve 305 at the far end of the threaded section 304, a locking nut 303 is installed on the outer side of the screw sleeve 305 through a threaded connection, the top of the locking nut 303 is connected to the bearing sleeve 302 through rotation, and the bearing sleeve 302 is sleeved on the outside of the screw sleeve 305.

[0055] It is worth noting that there are differences in the specifications of the positioning component 3 in Example 1 and Example 3. Specifically, in Example 1, the threaded segment 304 at the end of the positioning rod 301 matches the cylinder head thread groove 2 at the top of the cylinder body 1, while in Example 3, the threaded segment 304 at the end of the positioning rod 301 matches the oil pan thread groove 8 at the bottom of the cylinder body 1.

[0056] Supplementary explanation is as follows: In the present invention, the leakage test assembly 5 is composed of multiple parts, including a sealing cover 501, and a fitting sleeve 502 is provided on one side of the sealing cover 501, which can be replaced according to the specifications of the cylinder bore, and a guide tube 507 is fixed on the top of the sealing cover 501. The guide tube 507 is connected to the inside of the fitting sleeve 502, and the outside of the guide tube 507 is connected to the sliding screw tube 506 through a thread, and a connecting valve head 505 is fixed on the top of the guide tube 507 for installing either a pressure gauge 4 or an air injection cylinder 6. A connecting piece is installed on the bottom surface of the sliding screw tube 506, and one end of the connecting piece is fixed to the outside of the bearing sleeve 302.

[0057] The connecting member is composed of a slide rail arm 503 , the top of one end of the slide rail arm 503 is movably connected to the bottom surface of the sliding screw 506 , and the other end is equipped with a locking clamp 504 for fastening and mounting on the outside of the bearing sleeve 302 .

[0058] It is particularly noteworthy that the specifications of the leak test assembly 5 in the first embodiment and the third embodiment are different. Figure 4 As shown, the sealing cover 501 of the leak test assembly 5 in the first embodiment not only covers the cylinder bore, but also reserves a protrusion, which is used to cover the water channel hole in the cylinder body 1. Figure 2 As shown, the sealing cover 501 in the third embodiment does not have such a reserved protrusion, and in order not to interfere with the crankshaft groove 7, the specifications of the sealing cover 501 are relatively small. In addition, in actual applications, the height of the fitting sleeve 502 in the third embodiment is greater than the height of the fitting sleeve 502 in the first embodiment.

[0059] It should also be pointed out that, in the present invention, the connection between the fitting sleeve 502 and the sealing cover 501 is achieved by magnetism.

[0060] In addition, it should be noted that the present invention also provides the following technical solution: a method for replacing a leak test fixture, which is applied to all the positioning components 3 and the leak test components 5 disclosed in the above-mentioned cylinder leak test detection mechanism, and includes:

[0061] Step 1: Turn off the gas source of the gas injection cylinder 6 to release the pressure in the cylinder 1 to a safe level, wherein the safe level refers to when the pressure gauge 4 is zero;

[0062] Step 2: Loosen the locking nut 303 and rotate the bearing sleeve 302 to release the locking state of the positioning rod 301;

[0063] Step 3, remove the positioning rod 301 from the screw groove, and at the same time remove the leakage test component 5;

[0064] Step 4: Replace the new leak test assembly 5 to ensure that the fitting sleeve 502 matches the cylinder bore specifications;

[0065] Step 5: insert the replaced leak test assembly 5 into the cylinder bore, and reinsert the positioning rod 301 into the air screw groove;

[0066] Step 6: Tighten the locking nut 303 to ensure that the positioning rod 301 is firmly fixed in the screw groove; (the screw groove includes the cylinder head screw groove 2 and the oil pan screw groove 8)

[0067] Step 7: Run the air injection cylinder 6 to perform a leak test on the cylinder body 1 and observe the reading of the air pressure gauge 4 to confirm whether the sealing performance of the cylinder body 1 meets the requirements.

[0068] It should be added that after completing step seven, the pressure data shown on the barometer 4 is obtained and recorded, the pressure data is compared with the manufacturer's preset standard pressure value of the cylinder body 1, and the comparison result is obtained. Based on the comparison result, the sealing performance of the cylinder body 1 is obtained.

[0069] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is limited by the attached embodiments and their equivalents.

Claims

1. Cylinder leak detection mechanism, characterized in that: include: A positioning assembly (3) is installed in a cylinder head screw groove (2) at the top of the cylinder body (1); A leak test assembly (5) is slidably mounted outside the positioning assembly (3) and is used to seal the cylinder bore in the cylinder body (1); The positioning components (3) are installed on the top of the cylinder body (1) based on the number of cylinder bores in the cylinder body (1), and the tops of any two positioning components (3) are respectively installed with a pressure gauge (4) and an air injection cylinder (6); The cylinder body (1), the positioning assembly (3), the leak test assembly (5) and the oil pan installed at the bottom of the cylinder body (1) constitute a first sealed space. The first sealed space is pressurized by the gas injection cylinder (6) and is displayed in the pressure gauge (4).

2. The cylinder leak detection mechanism according to claim 1, characterized in that: A positioning assembly (3) is installed in a cylinder head screw groove (2) outside two piston positions corresponding to the cylinder bore of a cylinder body (1), a leak test assembly (5) is arranged in the cylinder bore corresponding to the piston position, and a pressure gauge (4) and an air injection cylinder (6) are respectively installed on the top of the two positioning assemblies (3).

3. The cylinder leak detection mechanism according to claim 1, characterized in that: The positioning components (3) are installed on the bottom of the cylinder body (1) based on the number of cylinder bores in the cylinder body (1), and a pressure gauge (4) and an air injection cylinder (6) are installed on the top of any two positioning components (3) respectively; The cylinder body (1), the positioning assembly (3), the leak test assembly (5), the cylinder head mounted on the top of the cylinder body (1), and the valve cover assembly mounted on the top of the cylinder head constitute a second sealed space. The second sealed space is pressurized by the gas injection cylinder (6) and is displayed in the pressure gauge (4).

4. The cylinder leak detection mechanism according to any one of claims 1 to 3, characterized in that: The positioning component (3) comprises: A positioning rod (301), the end of which is provided with a threaded section (304), a threaded sleeve (305) is fixed to the positioning rod (301) at a position away from the threaded section (304), a locking nut (303) is threadedly installed on the outside of the threaded sleeve (305), a bearing sleeve (302) is rotatably connected to the top of the locking nut (303), and the bearing sleeve (302) is sleeved outside the threaded sleeve (305).

5. The cylinder leak detection mechanism according to claim 4, characterized in that: The leak test assembly (5) comprises: A sealing cover (501), one side of which is provided with a fitting sleeve (502) for inserting into the cylinder bore, and the fitting sleeve (502) can be replaced based on the specifications of the cylinder bore; A flow guide tube (507) is fixed on the top of the sealing cover (501), and the flow guide tube (507) is connected to the interior of the fitting sleeve (502); The outside of the flow guide tube (507) is threadedly connected to a sliding screw tube (506), and a connecting valve head (505) is fixed on the top of the flow guide tube (507), and the connecting valve head (505) is used to install any one of a pressure gauge (4) and a gas injection cylinder (6); A connecting piece is installed on the bottom surface of the sliding spiral tube (506), and one end of the connecting piece is installed outside the bearing sleeve (302).

6. The cylinder leak detection mechanism according to claim 5, characterized in that: The connecting member comprises: a slide rail arm (503), the top of one end of the slide rail arm (503) is movably connected to the bottom surface of the sliding screw tube (506), and the other end of the slide rail arm (503) is installed with a locking hoop (504), and the locking hoop (504) is used for fastening and installing outside the bearing sleeve (302).

7. A method for replacing a leak test fixture, applied to a cylinder leak test detection mechanism as claimed in any one of claims 1 to 6, characterized in that: include: Step 1: Turn off the gas source of the gas injection cylinder (6) to release the pressure in the cylinder (1) to a safe level; Step 2: Loosen the locking nut (303) and rotate the bearing sleeve (302) to release the locking state of the positioning rod (301); Step 3, remove the positioning rod (301) from the screw groove and remove the leakage test assembly (5) at the same time; Step 4: Replace the new leak test assembly (5) to ensure that the fitting sleeve (502) matches the cylinder bore specifications; Step 5: insert the replaced leak test assembly (5) into the cylinder bore, and reinsert the positioning rod (301) into the screw groove; Step 6: Tighten the locking nut (303) to ensure that the positioning rod (301) is firmly fixed in the screw groove; Step 7: Run the air injection cylinder (6) to perform a leak test on the cylinder body (1), and observe the reading of the air pressure gauge (4) to confirm whether the sealing performance of the cylinder body (1) meets the requirements.

8. The method for replacing a leak test fixture according to claim 7, characterized in that: After completing step seven, obtain and record the pressure data shown on the barometer (4), compare the pressure data with the manufacturer's preset standard pressure value of the cylinder body (1), and obtain the comparison result. Based on the comparison result, obtain the sealing performance of the cylinder body (1).

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