Leakage detection tool for automobile air spring shell

Abstract

The utility model discloses a leak detection tool for an automobile air spring shell, and belongs to the field of airtightness detection equipment. The leak detection tool comprises a sealing box, a sealing box door fixedly installed on the sealing box, a through hole formed in the sealing box and used for being externally connected with a helium mass spectrometer, a supporting seat fixedly installed in the sealing box, a base movably installed on the supporting seat, and a helium filling mechanism arranged on the base and used for detecting a workpiece. The helium filling mechanism comprises an air inlet channel formed in the base and a first air cylinder fixedly installed on the outer wall of the sealing box, and an air inflation pipe which penetrates through the sealing box, extends into the sealing box and is in butt joint with the air inlet channel is fixedly installed at the output end of the first air cylinder. According to the leak detection tool, the gas inlet channel is filled with helium through the gas filling pipe, the helium is sent into a closed cavity formed among the workpiece, the upper floating block and the lower floating block through the gas guide channel from the lower die and the lower floating block, the whole process of leak detection testing is completed, operation is convenient and rapid, and detection is stable and reliable.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of air tightness detection equipment, and particularly relates to a leak detection tool for an automobile air spring shell. BACKGROUND

[0002] The working principle of the vacuum box type helium detection system mainly includes two stages: a vacuum extraction stage and a detection stage. In the vacuum extraction stage, the system extracts air in the detection box through a vacuum pump, so that a certain vacuum degree is reached. Then, in the detection stage, helium is filled into the product to be detected and sealed, and then the product is placed in the vacuum box. Since the helium molecules are small, if the product to be detected has air tightness problems, helium will escape from the defects and enter the vacuum box. At this time, the helium mass spectrometer in the vacuum box will detect the concentration change of helium, so as to judge the air tightness of the product.

[0003] The air tightness of the automobile air spring shell directly affects the safety of driving, and the prior art lacks a detection equipment for detecting the automobile air spring shell, which has certain disadvantages.

[0004] Therefore, the application provides a leak detection tool for an automobile air spring shell to solve the above problems. CONTENT OF THE INVENTION

[0005] The application provides a leak detection tool for an automobile air spring shell, which aims to solve the problems of the prior art in detecting the air tightness of the automobile air spring shell.

[0006] To achieve the above purpose, the application provides the following technical scheme: a leak detection tool for an automobile air spring shell, comprising a sealing box, a sealing box door fixedly installed on the sealing box, a through hole opened on the sealing box for connecting a helium mass spectrometer outside, a support seat fixedly installed in the sealing box, a base movably installed on the support seat, and a helium filling mechanism provided on the base for detecting a workpiece:

[0007] The helium filling mechanism comprises an air inlet channel opened on the base and a first air cylinder fixedly installed on the outer wall of the sealing box, and an air filling pipe penetrating through the sealing box and extending into the sealing box and being in butt joint with the air inlet channel is fixedly installed on the output end of the first air cylinder;

[0008] The helium filling mechanism further comprises a lower mold fixedly installed on the base, and a lower floating block for supporting the workpiece is movably installed on the lower mold, and the lower mold and the lower floating block are both provided with an air guide channel in communication with the air inlet channel;

[0009] The helium filling mechanism further comprises a second cylinder fixedly installed on the sealed box, the output end of the second cylinder extends inside the sealed box through the sealed box and is fixedly installed with an upper mold matched with the lower mold at the end, and the upper mold is movably installed with an upper floating block matched with the lower floating block and used for pressing the workpiece. In use, the door of the sealed box is opened, the base is pulled out, the workpiece is placed on the lower floating block, the base is then pushed into the sealed box, the second cylinder is started to drive the upper mold to move downward, the upper floating block is pressed on the top of the workpiece, the upper mold and the lower mold are combined, then the first cylinder is started to drive the inflation pipe to abut against the side edge of the base and connect with the air inlet, the door of the sealed box is closed, the helium mass spectrometer detection head is installed on the through hole, the air inlet is inflated with helium through the inflation pipe, the helium is sent from the lower mold and the lower floating block to the closed cavity formed between the workpiece and the upper floating block and the lower floating block through the air guide, the whole process of leak detection is completed, after detection, the door of the sealed box is opened, the second cylinder is started to drive the upper mold to move away from the surface of the workpiece, and the workpiece is taken out, which is convenient, fast, stable and reliable.

[0010] Preferably, in order to facilitate gas supply, the inflation pipe is provided with an inflation channel extending in the same direction as the inflation pipe, the inflation channel penetrates one end of the inflation pipe away from the first cylinder and is arranged in butt joint with the air inlet port, and the end of the inflation pipe outside the sealed box is provided with a gas supply interface in communication with the inflation channel, so that the helium is supplied into the air inlet through the butt joint of the inflation pipe and the air inlet, which is safe and convenient.

[0011] Preferably, in order to seal, the lower floating block is provided with a first sealing ring groove on the outer side wall, the first sealing ring groove is embedded with a first sealing rubber ring, the upper floating block is provided with a second sealing ring groove on the outer side wall, and the second sealing ring groove is embedded with a second sealing rubber ring, so as to ensure that all the air spaces of the workpiece have good sealing performance, the space in the sealed box is stably isolated, and the accuracy of detection is ensured.

[0012] Preferably, in order to abut against the workpiece, the first shaft shoulder screw extending into the lower mold and screwed with the lower mold is arranged through the lower floating block, a plurality of first spring cavities uniformly distributed in the circumferential direction are arranged in the lower mold, and the first rectangular spring is fixedly installed in the first spring cavity, one end of the first rectangular spring extends longitudinally outside the first spring cavity and abuts against the bottom of the lower floating block, so as to play a certain buffering role and make the sealing more stable and safe.

[0013] Preferably, in order to abut against the workpiece, a second shaft shoulder screw extending in the upper floating block and screwed with the upper floating block is arranged through the upper die, a plurality of second spring cavities uniformly distributed in the circumferential direction are formed in the upper die, and a second rectangular spring is fixedly installed in the second spring cavity, one end of the second rectangular spring extends longitudinally outside the second spring cavity and abuts against the top of the upper floating block, thereby playing a certain buffering role and making the sealing more stable and safe.

[0014] Preferably, in order to facilitate disengagement from the workpiece, a plurality of connecting blocks uniformly arranged in the circumferential direction are fixedly installed on the outer side wall of the upper die, a ejector rod parallel to the axial extension direction of the output shaft of the second cylinder is slidingly installed on the connecting block, and a third rectangular spring is sleeved on the ejector rod and abuts against the bottom of the connecting block, thereby avoiding the upper floating block from lifting the workpiece together and facilitating disengagement and disassembly of the workpiece.

[0015] Preferably, in order to ensure the sealing of the sealed box, the sealed box door comprises an arc-shaped door frame fixedly installed on the sealed box, a third cylinder fixedly installed on the door frame, an output end of the third cylinder extending into the door frame through the door frame, and a double-layer door plate fixedly installed on the output end of the third cylinder and located in the door frame and matched with the door frame, wherein the outer wall of the double-layer door plate is in abutment with the sealed box, and the double-layer door plate can be effectively ensured to be in abutment with the sealed box when being pushed, thereby ensuring the air tightness.

[0016] The leak detection tool opens the sealed box door, pulls out the base, places the workpiece on the lower floating block, then pushes the base into the sealed box, starts the second cylinder, drives the upper die to move downward, makes the upper floating block cover the top of the workpiece, and makes the upper die and the lower die complete die closing, then starts the first cylinder, drives the inflation pipe to abut against the side edge of the base, and completes the air connection with the air inlet, then closes the sealed box door, installs the helium mass spectrometer detection head on the through hole, fills helium into the air inlet through the inflation pipe, and the gas guide channel sends the helium from the lower die and the lower floating block into the sealed cavity formed between the workpiece and the upper floating block and the lower floating block, thereby completing the whole process of leak detection test. After detection, the sealed box door is opened, the second cylinder is started, the upper die is driven to move away from the surface of the workpiece, and the workpiece can be taken out, thereby achieving convenient and fast operation and stable and reliable detection.

[0017] The leak detection tool starts the third cylinder, the output end of the third cylinder drives the double-layer door plate to move up and down in the door frame, thereby opening or closing the door of the sealed box, the third cylinder is stable in extension and retraction, the speed is uniform, and the double-layer door plate can be effectively ensured to be in abutment with the sealed box when being pushed, thereby ensuring the air tightness. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is an appearance structure schematic view of a leak detection tool for an automobile air spring shell;

[0019] Figure 2 The fitting workpiece schematic diagram of the automobile air spring shell leak detection tool;

[0020] Figure 3 The cross-sectional structure schematic diagram of the automobile air spring shell leak detection tool;

[0021] Figure 4 The Figure 3 The enlarged schematic diagram in A of the figure;

[0022] Figure 5 The Figure 3 The enlarged schematic diagram in B of the figure;

[0023] Figure 6 The Figure 1 The enlarged schematic diagram in C of the figure.

[0024] In the figure:

[0025] 1, sealed box; 2, sealed box door; 21, door frame; 22, third cylinder; 23, double-layer door plate; 3, through hole; 4, support seat; 5, base; 6, workpiece; 7, helium filling mechanism; 71, air inlet; 72, first cylinder; 73, inflation pipe; 74, lower mold; 75, lower floating block; 76, air guide; 77, second cylinder; 78, upper mold; 79, upper floating block; 710, inflation channel; 711, gas supply interface; 712, first sealing ring groove; 713, first sealing rubber ring; 714, second sealing ring groove; 715, second sealing rubber ring; 716, first shaft shoulder screw; 717, first spring cavity; 718, first rectangular spring; 719, second shaft shoulder screw; 720, second spring cavity; 721, second rectangular spring; 722, connecting block; 723, ejector pin; 724, third rectangular spring. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0027] Embodiment 1

[0028] The present embodiment provides an automobile air spring shell leak detection tool, such as Figures 1-6As shown, the leak detection tool includes a sealed box 1, a sealed box door 2 fixedly installed on the sealed box 1, a through hole 3 opened on the sealed box 1 for external connection of a helium mass spectrometer, a support seat 4 fixedly installed in the sealed box 1, a base 5 movably installed on the support seat 4, and a helium filling mechanism 7 provided on the base 5 for detecting a workpiece 6:

[0029] The helium filling mechanism 7 includes an air inlet channel 71 opened on the base 5 and a first air cylinder 72 fixedly installed on the outer wall of the sealed box 1, and an air filling pipe 73 is fixedly installed on the output end of the first air cylinder 72, penetrating through the sealed box 1 and extending inside the sealed box 1 to be in abutment with the air inlet channel 71;

[0030] The helium filling mechanism 7 further includes a lower mold 74 fixedly installed on the base 5, and a lower floating block 75 for supporting the workpiece 6 is movably installed on the lower mold 74, and the lower mold 74 and the lower floating block 75 are both provided with an air guide channel 76 in communication with the air inlet channel 71;

[0031] The helium filling mechanism 7 further includes a second air cylinder 77 fixedly installed on the sealed box 1, and an upper mold 78 adapted to the lower mold 74 is fixedly installed on the output end of the second air cylinder 77, penetrating through the sealed box 1 and extending inside the sealed box 1, and an upper floating block 79 adapted to the lower floating block 75 for pressing the workpiece 6 is movably installed on the upper mold 78.

[0032] In use, the sealed box door 2 is opened, the base 5 is pulled out, the workpiece 6 is placed on the lower floating block 75, then the base 5 is pushed into the sealed box 1, the second air cylinder 77 is started to drive the upper mold 78 to move downward, so that the upper floating block 79 is pressed on the top of the workpiece 6, and the upper mold 78 and the lower mold 74 are completed to mold, then the first air cylinder 72 is started to drive the air filling pipe 73 to abut against the side edge of the base 5, and the air filling pipe 73 is completed to connect with the air inlet channel 71, then the sealed box door 2 is closed, the detection head of the helium mass spectrometer is installed on the through hole 3, the air inlet channel 71 is filled with helium through the air filling pipe 73, and the air guide channel 76 sends the helium from the lower mold 74 and the lower floating block 75 into the closed cavity formed between the workpiece 6 and the upper floating block 79 and the lower floating block 75, to complete the whole process of leak detection test, after the detection is completed, the sealed box door 2 is opened, the second air cylinder 77 is started to drive the upper mold 78 to move away from the surface of the workpiece 6, and the workpiece 6 can be taken out, which is convenient and fast, and the detection is stable and reliable.

[0033] Specifically, the air filling pipe 73 is provided with an air filling channel 710 extending in the same direction as the air filling pipe 73, the air filling channel 710 penetrates through one end of the air filling pipe 73 away from the first air cylinder 72 and is in abutment with the air inlet channel 71, and the end of the air filling pipe 73 located outside the sealed box 1 is provided with a gas supply interface 711 in communication with the air filling channel 710.

[0034] In use, the helium charging device is connected to the gas supply interface 711, helium gas enters the charging pipe 73 through the charging channel 710, and is sent into the gas inlet channel 71 through the charging pipe 73 and the gas inlet channel 71, thereby completing the supply of helium gas, which is safe and convenient.

[0035] More specifically, the first sealing ring groove 712 is formed in the outer side wall of the lower floating block 75, and the first sealing rubber ring 713 is embedded in the first sealing ring groove 712. The second sealing ring groove 714 is formed in the outer side wall of the upper floating block 79, and the second sealing rubber ring 715 is embedded in the second sealing ring groove 714.

[0036] In use, when the lower floating block 75 and the upper floating block 79 are in contact with the inner and outer walls of the workpiece 6, the first sealing rubber ring 713 and the second sealing rubber ring 715 are in sealing connection with the workpiece 6 in an internal expansion mode, thereby ensuring that all the ventilation spaces of the workpiece 6 have good sealing performance, ensuring stable isolation of the space in the sealing box 1, and ensuring the accuracy of detection.

[0037] Further, the first shaft shoulder screw 716 extending into the lower mold 74 and screwing with the lower mold 74 is arranged through the lower floating block 75. The first spring cavity 717 is uniformly distributed in the circumferential direction and is formed in the lower mold 74. The first rectangular spring 718 is fixedly installed in the first spring cavity 717. One end of the first rectangular spring 718 extends longitudinally outside the first spring cavity 717 and abuts against the bottom of the lower floating block 75.

[0038] In use, when the lower mold 74 drives the lower floating block 75 to support and press the surface of the workpiece 6, the lower floating block 75 is in an initial state of upward floating state. When the lower floating block 75 is pressed by the downward pressure of the upper floating block 79 after contacting the bottom of the workpiece 6, the lower floating block 75 extrudes the first rectangular spring 718, so that the first rectangular spring 718 gradually shrinks, and the lower floating block 75 gradually closes the connection surface of the lower mold 74 along the axial direction of the first shaft shoulder screw 716, thereby playing a certain buffering role and making the sealing more stable and safe.

[0039] Further, the second shaft shoulder screw 719 extending into the upper floating block 79 and screwing with the upper floating block 79 is arranged through the upper mold 78. The second spring cavity 720 is uniformly distributed in the circumferential direction and is formed in the upper mold 78. The second rectangular spring 721 is fixedly installed in the second spring cavity 720. One end of the second rectangular spring 721 extends longitudinally outside the second spring cavity 720 and abuts against the top of the upper floating block 79.

[0040] When the upper mold 78 is lowered to press the surface of the workpiece 6, the upper floating block 79 is initially in a sagging floating state. When the upper floating block 79 contacts the top of the workpiece 6, the second rectangular spring 721 is compressed, causing the second rectangular spring 721 to gradually contract. The upper floating block 79 gradually closes along the axial direction of the second shaft shoulder screw 719 to the connecting surface of the upper mold 78, thereby playing a certain buffering role and making the sealing more stable and safe.

[0041] The connecting block 722 is fixedly installed on the outer side wall of the upper mold 78. The connecting block 722 is slidably installed with a top rod 723 extending in parallel with the axial direction of the output shaft of the second air cylinder 77. The third rectangular spring 724 is sleeved on the top rod 723 and abuts against the bottom of the connecting block 722.

[0042] When the upper mold 78 is lowered to press the surface of the workpiece 6, the upper floating block 79 is initially in a sagging floating state. When the upper floating block 79 contacts the top of the workpiece 6, the second rectangular spring 721 is compressed, causing the second rectangular spring 721 to gradually contract. The upper floating block 79 gradually closes along the axial direction of the second shaft shoulder screw 719 to the connecting surface of the upper mold 78, thereby playing a certain buffering role and making the sealing more stable and safe.

[0043] Embodiment 2

[0044] Different from the embodiment 1, when the box door is opened and closed, in order to ensure the sealing, stable pushing is required. Therefore, the sealing box door 2 comprises a door frame 21 fixedly installed on the sealing box 1 and designed in an arch shape. The door frame 21 is fixedly installed with a third air cylinder 22. The output end of the third air cylinder 22 extends into the door frame 21. The output end of the third air cylinder 22 is fixedly installed with a double-layer door plate 23 matched with the door frame 21. The outer wall of the double-layer door plate 23 is attached to the sealing box 1.

[0045] In use, the third air cylinder 22 is started. The output end of the third air cylinder 22 drives the double-layer door plate 23 to move up and down in the door frame 21, thereby opening or closing the box door of the sealing box 1. The third air cylinder 22 is stable in extension and contraction and uniform in speed. When the double-layer door plate 23 is pushed, the double-layer door plate 23 can be effectively ensured to always attach to the sealing box 1, thereby ensuring the air tightness.

[0046] The above is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacement or change according to the technical solution and concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A leak detection tool for an automobile air spring shell, comprising a sealed box (1), a sealed box door (2) fixedly installed on the sealed box (1), a through hole (3) opened on the sealed box (1) for connecting a helium mass spectrometer, a support seat (4) fixedly installed in the sealed box (1), a base (5) movably installed on the support seat (4), a helium filling mechanism (7) provided on the base (5) for detecting a workpiece (6), characterized in that: the helium filling mechanism (7) comprises an air inlet channel (71) opened on the base (5) and a first air cylinder (72) fixedly installed on the outer wall of the sealed box (1), and a gas filling pipe (73) penetrating through the sealed box (1) and extending inside the sealed box (1) is fixedly installed on the output end of the first air cylinder (72) and is in abutment with the air inlet channel (71); the helium filling mechanism (7) further comprises a lower die (74) fixedly installed on the base (5), and a lower floating block (75) for supporting the workpiece (6) is movably installed on the lower die (74), and the lower die (74) and the lower floating block (75) are both provided with a gas guide channel (76) in communication with the air inlet channel (71); the helium filling mechanism (7) further comprises a second air cylinder (77) fixedly installed on the sealed box (1), and an upper die (78) fixedly installed on the output end of the second air cylinder (77) and extending inside the sealed box (1) is in abutment with the lower die (74), and an upper floating block (79) for pressing the workpiece (6) is movably installed on the upper die (78) and is in abutment with the lower floating block (75).

2. The leak detection tool for an automotive air spring shell of claim 1, wherein: a gas filling channel (710) extending in the same direction as the axial direction of the gas filling pipe (73) is opened in the gas filling pipe (73), the gas filling channel (710) penetrates through one end of the gas filling pipe (73) away from the first air cylinder (72) and is in abutment with the port of the air inlet channel (71), and a gas supply interface (711) in communication with the gas filling channel (710) is opened on the end of the gas filling pipe (73) outside the sealed box (1).

3. The leak detection tool for an automotive air spring shell of claim 1, wherein: a first sealing ring groove (712) is opened on the outer side wall of the lower floating block (75), a first sealing rubber ring (713) is embedded in the first sealing ring groove (712), a second sealing ring groove (714) is opened on the outer side wall of the upper floating block (79), and a second sealing rubber ring (715) is embedded in the second sealing ring groove (714).

4. The leak detection tool for an automotive air spring shell of claim 1, wherein: a first shaft shoulder screw (716) extending inside the lower die (74) and being screwed with the lower die (74) is penetratingly provided on the lower floating block (75), a plurality of first spring cavities (717) uniformly distributed in the circumferential direction are opened in the lower die (74), a first rectangular spring (718) is fixedly installed in the first spring cavity (717), and one end of the first rectangular spring (718) extends longitudinally outside the first spring cavity (717) and is in abutment with the bottom of the lower floating block (75).

5. The leak detection tool for an automotive air spring shell of claim 1, wherein: The upper mold (78) is provided with a second shaft shoulder screw (719) extending in the upper floating block (79) and screwed with the upper floating block (79), a plurality of second spring cavities (720) are arranged in the upper mold (78) and distributed uniformly in the circumferential direction, a second rectangular spring (721) is fixedly installed in the second spring cavity (720), and one end of the second rectangular spring (721) extends longitudinally outside the second spring cavity (720) and abuts against the top of the upper floating block (79).

6. The leak detection tool for an automotive air spring shell of claim 5, wherein: A plurality of connecting blocks (722) are fixedly installed on the outer wall of the upper mold (78) and are arranged uniformly in the circumferential direction, a top rod (723) parallel to the axial extension direction of the output shaft of the second air cylinder (77) is slidably installed on the connecting block (722), and a third rectangular spring (724) is sleeved on the top rod (723) and abuts against the bottom of the connecting block (722).

7. The leak detection tool of claim 6, wherein: The sealing box door (2) comprises an arched door frame (21) fixedly installed on the sealing box (1), a third air cylinder (22) fixedly installed on the door frame (21), an output end of the third air cylinder (22) extending into the door frame (21) through the door frame (21), a double-layer door plate (23) fixedly installed on the output end of the third air cylinder (22) and matched with the door frame (21), and the outer wall of the double-layer door plate (23) abutting against the sealing box (1).

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