Airtightness detection device for production of automobile engine fuel injection nozzle

Abstract

The application discloses a kind of air-tightness detection devices for automobile engine fuel injection nozzle production, belong to fuel injection nozzle detection technical field, the air-tightness detection device for automobile engine fuel injection nozzle production of the present application, including pedestal, the pedestal is fixedly connected with a plurality of first fixed frame, the first fixed frame is fixedly connected with transparent test tube in, the pedestal upper end is fixedly connected with a plurality of fixed plate, the upper end of the pedestal is fixedly connected with wire plug-in mechanism, the fixed plate is provided with fuel injection nozzle fixing mechanism, fuel injection nozzle fixing mechanism and transparent test tube between being provided with the fuel injection nozzle to be measured, one side of the pedestal is fixedly connected with reflux pump, the reflux pump is fixedly connected with liquid storage tank at the end away from the pedestal.The present application is used by wire plug-in mechanism and fuel injection nozzle fixing mechanism, the process of fuel injection nozzle air-tightness test is greatly automated, greatly reduce the time required for test product fixation and wire connection, improve detection efficiency.

Description

Technical Field

[0001] This invention belongs to the field of fuel injector testing technology, specifically relating to an airtightness testing device for the production of automotive engine fuel injectors. Background Technology

[0002] The airtightness testing device for automotive engine fuel injectors is an automated device specifically designed to test the sealing performance of fuel injectors. It effectively detects even minute leaks, ensuring engine reliability and efficiency. Its core principle involves applying a pressurized liquid to the fuel passage of the injector and using high-precision sensors to monitor pressure changes in real time, thereby determining whether a leak exists and whether the degree of leakage is within acceptable limits. This device is crucial for ensuring the accuracy, fuel economy, and emission control of the engine's fuel injection system, and is a key testing tool for ensuring fuel injector quality in the manufacturing and maintenance processes.

[0003] When conducting airtightness testing, it is necessary to repeatedly plug and unplug the wiring and oil inlet pipe of multiple fuel injectors under test, resulting in low testing efficiency and easy damage to the pipeline. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an airtightness testing device for the production of automotive engine fuel injectors.

[0005] The technical solution adopted to solve the above technical problems is: an airtightness testing device for automobile engine fuel injector production, including a base, a plurality of first fixing frames fixedly connected to the base, a transparent test tube fixedly connected inside the first fixing frame, a plurality of fixing plates fixedly connected to the upper end of the base, a wire plugging and unplugging mechanism fixedly connected to the upper end of the base, a fuel injector fixing mechanism provided on the fixing plate, a fuel injector to be tested provided between the fuel injector fixing mechanism and the transparent test tube, a return pump fixedly connected to one side of the base, and a liquid storage tank fixedly connected to the end of the return pump away from the base;

[0006] The fuel injector fixing mechanism includes a first fixing ring fixedly connected to a fixing plate, a plurality of fourth connecting rods rotatably connected to the first fixing ring, a first cylinder fixedly connected to the end of the fourth connecting rod away from the first fixing ring, the first cylinder passing through a slidingly connected rocker plate, a locking plate fixedly connected to the end of the rocker plate away from the first cylinder, and a plurality of locking blocks fixedly connected to the inner side of the locking plate.

[0007] The above technical solution enables rapid positioning and initial locking of the fuel injector under test. The first fixing ring provides stable rotational support for the fourth link. Through the coordinated transmission of the fourth link, the first cylinder and the rocker plate, the locking plate and the locking block move synchronously, so that the locking block can fit the corresponding part of the fuel injector under test, laying the foundation for subsequent sealing and airtightness testing. At the same time, the cooperation of multiple components can ensure the stability of the fixation and prevent the fuel injector under test from shifting during the testing process.

[0008] Furthermore, the transparent test tube includes a tube body fixedly connected to a first fixing frame, a lower tube port fixedly connected to the upper end of the tube body, an upper tube port fixedly connected to the lower end of the tube body, and the lower ends of several upper tube ports are interconnected.

[0009] The above technical solution utilizes a first fixing bracket to ensure stable installation of the tube body, preventing the transparent test tube from shaking during testing. The lower tube opening is used to connect with the nozzle of the fuel injector under test, facilitating the collection of test liquid sprayed from the fuel injector. The upper tube opening is used to collect the test liquid in each tube body. The interconnected design allows the liquid in multiple transparent test tubes to flow centrally, facilitating subsequent unified recovery to the storage tank via a return pump. At the same time, the transparent tube body allows staff to visually observe the flow and spraying of the test liquid, enabling timely judgment on whether the nozzle function of the fuel injector under test is normal.

[0010] Furthermore, the wire plugging and unplugging mechanism includes a motor fixedly connected to a base, a pair of second fixed frames fixedly connected to the base, an output shaft fixedly connected to the output end of the motor, a drive gear fixedly connected to the end of the output shaft away from the motor, a rotating shaft rotatably connected through the second fixed frames, a driven gear fixedly connected to the rotating shaft, and the drive gear and the driven gear meshing with each other.

[0011] Through the above technical solution, the base provides a stable mounting carrier for the motor and the second fixed frame. The second fixed frame is used to limit and support the rotating shaft, ensuring that the rotating shaft can rotate smoothly. When the motor is working, it drives the output shaft to rotate, and the output shaft drives the driving gear to rotate synchronously. Since the driving gear and the driven gear mesh with each other, the rotation of the driving gear will drive the driven gear to rotate, and then drive the rotating shaft to rotate, realizing the stable transmission of motor power. This provides a power source for the subsequent plug insertion and removal actions of the wire plugging and unplugging mechanism. Moreover, the gear meshing transmission has the characteristics of high precision and strong stability, which can ensure the synchronization and reliability of the transmission process.

[0012] Furthermore, both ends of the rotating shaft are fixedly connected to rotating rods, and a first strip-shaped hole is provided on the rotating rod. A fixed shaft is slidably connected through the first strip-shaped hole, and a first movable plate is fixedly connected to the fixed shaft. A lifting column is fixedly connected to the end of the first movable plate away from the fixed shaft.

[0013] With the above technical solution, when the rotating shaft rotates, it will drive the rotating rods at both ends to rotate synchronously. During the rotation of the rotating rods, the fixed shaft will slide in the first slot. Since the fixed shaft is fixedly connected to the first moving plate, the sliding of the fixed shaft will drive the first moving plate to move up and down, thereby driving the lifting column to move up and down synchronously. This converts the rotational motion of the rotating shaft into the linear lifting motion of the lifting column, realizing the conversion of the power transmission direction and providing a direct driving force for the subsequent up and down movement of the plug. At the same time, the design of the first slot can limit the sliding trajectory of the fixed shaft, ensuring the smoothness of the lifting motion of the first moving plate and the lifting column, and avoiding deviation and jamming.

[0014] Furthermore, the end of the lifting column away from the first moving plate is rotatably connected to a pair of first connecting rods, the end of the first connecting rod away from the lifting column is rotatably connected to a second connecting rod, the end of the second connecting rod away from the first connecting rod is rotatably connected to a second moving plate, the end of the second connecting rod near the first connecting rod is rotatably connected to a third connecting rod, the end of the third connecting rod away from the second connecting rod is rotatably connected to a fixed plate, both ends of the second moving plate are slidably connected to sliding rods, the upper end of the sliding rod is fixedly connected to the fixed plate, the lower end of the sliding rod is fixedly connected to a limit frame, and the lower end of the second moving plate is fixedly connected to a plug.

[0015] Through the above technical solution, when the lifting column rises and falls, it drives the first connecting rod to rotate synchronously. The rotation of the first connecting rod drives the second connecting rod to move. Under the limiting support of the third connecting rod, the second connecting rod drives the second moving plate to slide up and down along the slide bar. The slide bar can limit the movement trajectory of the second moving plate and ensure the stability of its movement process. The up and down sliding of the second moving plate will drive the plug to move synchronously, thereby realizing the precise insertion and removal of the plug and the injector socket under test. At the same time, the second connecting rod and the third connecting rod cooperate to be in the same straight line after the plug is inserted into the socket, thereby locking the plug, improving the stability of the plug and socket connection, ensuring the reliability of the electrical control connection, and providing a guarantee for the electrical control of the injector under test.

[0016] Furthermore, a base plate is fixedly connected to both sides of the base, a hydraulic rod is fixedly connected to the upper surface of the base plate, a top plate is fixedly connected to the upper end of the hydraulic rod, a plurality of oil injection pipes are fixedly connected through the top plate, a pressure test gauge is fixedly connected to the upper end of the oil injection pipes, and an oil delivery pipe is fixedly connected to one side of the oil injection pipes.

[0017] Through the above technical solution, the extension and retraction of the hydraulic rod can drive the top plate to move up and down, thereby driving the oil injection pipe to move up and down synchronously. This facilitates the precise connection between the oil injection pipe and the oil inlet pipe of the injector under test. The oil delivery pipe is used to connect the storage tank and the oil injection pipe to realize the delivery of the test liquid. The oil injection pipe is used to inject the test liquid into the injector under test. The pressure test gauge can detect the liquid pressure in the oil injection pipe in real time, thereby reflecting the airtightness of the injector under test. If there is a leak in the injector under test, the value of the pressure test gauge will change abnormally. The staff can quickly determine whether the airtightness of the injector under test is qualified through the pressure test gauge.

[0018] Furthermore, a fifth connecting rod is rotatably connected to the oil injection pipe, and the end of the fifth connecting rod away from the oil injection pipe is rotatably connected to the fourth connecting rod. Several connecting rods are fixedly connected to the lower end of the first fixing ring, and a second fixing ring is fixedly connected to the end of the connecting rod away from the first fixing ring. A second strip-shaped hole is opened on the rocker plate, and the second strip-shaped hole and the first cylinder slide in mutual engagement. A second cylinder is fixedly connected between the second fixing rings, and the second cylinder passes through and rotatably connects to the rocker plate. A sealing rubber ring is fixedly connected to the lower end of the oil injection pipe.

[0019] Through the above technical solution, the up-and-down movement of the oil injection pipe will drive the fifth link to rotate, and the rotation of the fifth link will push the fourth link to rotate around the first fixed ring, realizing the linkage between the fuel injector fixing mechanism and the oil injection pipe. This allows the fuel injector under test to be fixed at the same time as the oil injection pipe is connected, improving the testing efficiency. The sealing rubber ring can enhance the sealing between the oil injection pipe and the fuel injector under test inlet pipe, preventing the test liquid from leaking from the connection point and ensuring the accuracy of the airtightness test results.

[0020] Furthermore, the fuel injector to be tested includes a main body, a nozzle is fixedly connected to the lower end of the main body, a socket is fixedly connected to the upper end of the main body, an oil inlet pipe is fixedly connected to the upper end of the main body, a plurality of locking grooves are provided on the outside of the oil inlet pipe, a first sealing ring is provided on the outer sleeve of the nozzle, a second sealing ring is provided on the outer sleeve of the oil inlet pipe, the liquid storage tank includes a tank body, a water pump is fixedly connected to the upper end of the tank body, a first pipe is fixedly connected to the output end of the water pump, a second pipe is fixedly connected to the input end of the water pump, and a filter screen is fixedly connected to the lower end of the second pipe.

[0021] Through the above technical solution, by using a storage tank, the oil is delivered to the fuel injector to be tested by a water pump, and then collected back into the storage tank by a return pump, so that the test liquid can be recycled and waste is avoided. When the second pipeline draws oil, it is filtered through a filter screen to prevent impurities from entering the fuel injector to be tested and affecting it.

[0022] The beneficial effects of the present invention are as follows: (1) The present invention uses a wire plugging and unplugging mechanism, through a motor driving a drive gear, the drive gear driving a rotating shaft through a driven gear, the rotating shaft driving a rotating rod, pressing down the first moving plate, thereby causing the lifting column to move down, and spreading the first connecting rod to both sides, so that the second connecting rod and the third connecting rod cooperate to push the second moving plate, and the second moving plate drives the plug to be inserted into the socket. At this time, the second connecting rod and the third connecting rod are in a straight line, completing the locking of the plug, greatly improving the plug's resistance to being pulled out; (2) The present invention uses an oil injector fixing mechanism, when the hydraulic rod drives the top plate to move down, the oil injection pipe moves down, thereby driving the fifth connecting rod to open outward, the fifth connecting rod pushes the fourth connecting rod to move outward, the fourth connecting rod drives the rocker plate to rotate, thereby causing the locking plate to close. The locking block on the locking plate is inserted into the locking groove, and the sealing rubber ring is tightly attached to the oil inlet pipe to form a seal. The lower end of the nozzle to be tested is held by the upper pipe opening, thus completing the fixing of the nozzle to be tested. The staff only needs to place the nozzle to be tested on the transparent test tube to complete the fixing and cable connection, which greatly reduces the labor intensity of the staff. At the same time, there is no need to seal through the first sealing ring and the second sealing ring, avoiding wear on the first sealing ring and the second sealing ring; (3) In this invention, the oil is transported to the nozzle to be tested by the water pump through the use of the storage tank, and is collected back into the storage tank by the return pump, so that the test liquid can be recycled and used to avoid waste. When the second pipe sucks oil, it is filtered through the filter screen to prevent impurities from entering the nozzle to be tested and affecting the nozzle to be tested. Attached Figure Description

[0023] Figure 1 This is a first-view structural diagram of the present invention;

[0024] Figure 2 This is a second-view structural diagram of the present invention;

[0025] Figure 3 This is a cross-sectional view of the liquid storage tank of the present invention;

[0026] Figure 4 This is a diagram showing the internal structure of the wire plugging / unplugging mechanism of the present invention;

[0027] Figure 5 This is a cross-sectional view of the transparent test tube of the present invention;

[0028] Figure 6 yes Figure 5 Enlarged view of point A;

[0029] Figure 7 This is a structural diagram of the fuel injector fixing mechanism of the present invention;

[0030] Figure 8 This is a first-view structural diagram of the wire plugging and unplugging mechanism of the present invention;

[0031] Figure 9This is a second-view structural diagram of the wire plugging and unplugging mechanism of the present invention;

[0032] Figure 10 This is an exploded structural diagram of the fuel injector fixing mechanism of the present invention;

[0033] Figure 11 This is a cross-sectional view of the fuel injector fixing mechanism of the present invention;

[0034] Figure 12 yes Figure 11 Enlarged view of point B.

[0035] Reference numerals: 1. Base; 2. First fixing frame; 3. Transparent test tube; 31. Tube body; 32. Upper tube opening; 33. Lower tube opening; 4. Wire plugging / unplugging mechanism; 41. Motor; 42. Output shaft; 43. Drive gear; 44. Second fixing frame; 45. Driven gear; 46. Rotating shaft; 47. Rotating rod; 48. First slotted hole; 49. Fixing shaft; 410. First moving plate; 411. Lifting column; 412. First connecting rod; 413. Second connecting rod; 414. Third connecting rod; 415. Second moving plate; 416. Slide rod; 417. Limiting frame; 418. Plug; 5. Injector fixing mechanism; 51. Base plate; 52. Hydraulic rod; 53. Top plate; 54. Oil delivery 55. Pipeline; 56. Oil injection pipeline; 57. Pressure test gauge; 58. First retaining ring; 59. Connecting rod; 50. Second retaining ring; 510. Fourth connecting rod; 511. Fifth connecting rod; 512. Rocker; 513. Second strip hole; 514. Locking plate; 515. Locking block; 516. First cylinder; 517. Second cylinder; 518. Sealing rubber ring; 6. Injector nozzle to be tested; 61. Main body; 62. Nozzle; 63. First sealing ring; 64. Oil inlet pipe; 65. Socket; 66. Locking groove; 67. Second sealing ring; 7. Liquid storage tank; 71. Tank body; 72. Water pump; 73. First pipeline; 74. Second pipeline; 75. Filter screen; 8. Return pump; 9. Retaining plate. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0037] like Figures 1-12As shown in this embodiment, an airtightness testing device for automobile engine fuel injector production includes a base 1. A plurality of first fixing frames 2 are fixedly connected to the base 1. A transparent test tube 3 is fixedly connected inside each first fixing frame 2. The transparent test tube 3 includes a tube body 31 fixedly connected to the first fixing frames 2. A lower port 33 is fixedly connected to the upper end of the tube body 31, and an upper port 32 is fixedly connected to the lower end of the tube body 31. The lower ends of the plurality of upper ports 32 are interconnected. A plurality of fixing plates 9 are fixedly connected to the upper end of the base 1. A return pump 8 is fixedly connected to one side of the base 1, and a liquid storage tank 7 is fixedly connected to the end of the return pump 8 away from the base 1. The storage tank 7 includes a tank body 71. A water pump 72 is fixedly connected to the upper end of the tank body 71. A first pipe 73 is fixedly connected to the output end of the water pump 72, and a second pipe 74 is fixedly connected to the input end of the water pump 72. A filter screen 75 is fixedly connected to the lower end of the second pipe 74. When the water pump 72 is started, clean water in the tank body 71 is pumped into the first pipe 73. At this time, the liquid passes through the filter screen 75 and enters the second pipe 74 to prevent impurities from entering the fuel injector 6 to be tested. Then, the liquid sequentially enters the main body 61 through the first pipe 73, the oil supply pipe 54, and the oil inlet pipe 64. The liquid is then pumped back into the storage tank 7 by the return pump 8 to avoid waste.

[0038] like Figures 4-9 As shown, a wire plugging and unplugging mechanism 4 is fixedly connected to the upper end of the base 1. The wire plugging and unplugging mechanism 4 includes a motor 41 fixedly connected to the base 1. A pair of second fixed frames 44 are fixedly connected to the base 1. An output shaft 42 is fixedly connected to the output end of the motor 41. A drive gear 43 is fixedly connected to the end of the output shaft 42 away from the motor 41. A rotating shaft 46 is rotatably connected through the second fixed frames 44. A driven gear 45 is fixedly connected to the rotating shaft 46. The drive gear 43 and the driven gear 45 mesh with each other. The motor 41 drives the output shaft 42 to rotate. The output shaft 42 drives the drive gear 43 to rotate. The drive gear 43 drives the driven gear 45 to rotate. The driven gear 45 drives the rotating shaft 46 to rotate. The rotating shaft 46 drives the rotating rod 47 to rotate.

[0039] Rotating shaft 46 has rotating rods 47 fixedly connected to both ends. A first strip hole 48 is provided on the rotating rod 47. A fixed shaft 49 is slidably connected through the first strip hole 48. A first moving plate 410 is fixedly connected to the fixed shaft 49. A lifting column 411 is fixedly connected to the end of the first moving plate 410 away from the fixed shaft 49. Rotating shaft 46 pushes fixed shaft 49 down, fixed shaft 49 drives first moving plate 410 down, first moving plate 410 drives lifting column 411 down.

[0040] A pair of first connecting rods 412 are rotatably connected to the end of the lifting column 411 away from the first moving plate 410. A second connecting rod 413 is rotatably connected to the end of the first connecting rod 412 away from the lifting column 411. A second moving plate 415 is rotatably connected to the end of the second connecting rod 413 away from the first connecting rod 412. A third connecting rod 414 is rotatably connected to the end of the second connecting rod 413 near the first connecting rod 412. The end of the third connecting rod 414 away from the second connecting rod 413 is rotatably connected to the fixed plate 9. Sliding rods 416 are slidably connected to both ends of the second moving plate 415. The upper end of the sliding rod 416 is connected to the fixed plate 9. The fixed plate 9 is fixedly connected, the lower end of the slide rod 416 is fixedly connected to the limit frame 417, and the lower end of the second moving plate 415 is fixedly connected to the plug 418. When the lifting column 411 moves down, it opens the first connecting rod 412 to both sides. The first connecting rod 412 pushes the second connecting rod 413 to move outward, so that the second connecting rod 413 and the third connecting rod 414 cooperate to push the second moving plate 415 down. The second moving plate 415 drives the plug 418 to be inserted into the socket 65, completing the electrical control connection. At this time, the second connecting rod 413 and the third connecting rod 414 are in a straight line, realizing the locking of the plug 418.

[0041] like Figure 2 , Figure 3 , Figure 7 , Figures 10-12 As shown, a fuel injector fixing mechanism 5 is provided on the fixing plate 9. The fuel injector fixing mechanism 5 includes a first fixing ring 57 fixedly connected to the fixing plate 9. Several fourth connecting rods 510 are rotatably connected to the first fixing ring 57. A first cylinder 516 is fixedly connected to the end of the fourth connecting rod 510 away from the first fixing ring 57. The first cylinder 516 slides through and is connected to a rocker plate 512. A locking plate 514 is fixedly connected to the end of the rocker plate 512 away from the first cylinder 516. Several locking devices are fixedly connected to the inner side of the locking plate 514. Block 515, hydraulic rod 52 drives top plate 53 to move down, top plate 53 drives oil injection pipe 55 to move down, oil injection pipe 55 pushes fifth link 511 to rotate outward, fifth link 511 pushes fourth link 510 to expand outward, fourth link 510 drives rocker plate 512 to rotate, causing locking plate 514 to retract inward, so that locking block 515 is inserted into locking groove 66, locking plate 514 wraps and fixes oil inlet pipe 64, and at the same time makes sealing rubber ring 518 tightly attached to oil inlet pipe 64, completing the fixation of the fuel injector 6 to be tested.

[0042] The base 1 is fixedly connected to both sides of the base plate 51. The base plate 51 is fixedly connected to the upper surface of the base plate 51. The upper end of the hydraulic rod 52 is fixedly connected to the top plate 53. Several oil injection pipes 55 are fixedly connected through the top plate 53. The upper end of the oil injection pipes 55 is fixedly connected to the pressure test gauge 56. The oil injection pipe 55 is fixedly connected to one side of the oil injection pipe 55. An oil delivery pipe 54 is fixedly connected to one side of the oil injection pipe 55.

[0043] A fifth connecting rod 511 is rotatably connected to the oil injection pipe 55. The end of the fifth connecting rod 511 away from the oil injection pipe 55 is rotatably connected to the fourth connecting rod 510. Several connecting rods 58 are fixedly connected to the lower end of the first fixing ring 57. A second fixing ring 59 is fixedly connected to the end of the connecting rod 58 away from the first fixing ring 57. A second slotted hole 513 is opened on the rocker plate 512. The second slotted hole 513 and the first cylinder 516 slide against each other. The second fixing rings 59 are fixedly connected to each other. Two cylinders 517, the second cylinder 517 passes through and is rotatably connected to the rocker plate 512. The lower end of the oil injection pipe 55 is fixedly connected to a sealing rubber ring 518. When it is necessary to remove the oil injector 6 to be tested, the hydraulic rod 52 only needs to push the top plate 53 upward. At this time, the oil injection pipe 55 pulls the fifth connecting rod 511, the fifth connecting rod 511 pulls the fourth connecting rod 510 to retract, the fourth connecting rod 510 drives the rocker plate 512 to rotate, thereby causing the locking plate 514 to expand outward and the locking block 515 to disengage from the locking groove 66.

[0044] like Figure 7 As shown, a fuel injector 6 to be tested is disposed between the fuel injector fixing mechanism 5 and the transparent test tube 3. The fuel injector 6 to be tested includes a main body 61, a nozzle 62 fixedly connected to the lower end of the main body 61, a socket 65 fixedly connected to the upper end of the main body 61, and an oil inlet pipe 64 fixedly connected to the upper end of the main body 61. Several locking grooves 66 are opened on the outside of the oil inlet pipe 64. A first sealing ring 63 is fitted over the nozzle 62, and a second sealing ring 67 is fitted over the oil inlet pipe 64. The sealing performance of the fuel injector 6 to be tested is detected by a pressure test gauge 56. Then, the nozzle 62 is opened by electronic control to spray liquid into the transparent test tube 3. The function of the nozzle 62 is checked by the scale on the transparent test tube 3.

[0045] The working principle of this embodiment is as follows: When testing is required, the operator places the injector 6 to be tested on the transparent test tube 3, inserts the nozzle 62 into the upper tube opening 32, and simultaneously positions the socket 65 within the limiting frame 417. Then, the hydraulic rod 52 is activated, which drives the top plate 53 to move down. The top plate 53 drives the oil injection pipe 55 to move down, and the oil injection pipe 55 pushes the fifth connecting rod 511 to rotate outward. The fifth connecting rod 511 pushes the fourth connecting rod 510 to expand outward. The fourth connecting rod 510 drives the rocker plate 512 to rotate, causing the locking plate 514 to retract inward, thereby inserting the locking block 515 into the locking groove 66. The locking plate 514 wraps around and fixes the oil inlet pipe 64, while simultaneously ensuring that the sealing rubber ring 518 is tightly attached to the oil inlet pipe 64, thus completing the fixation of the injector 6 to be tested. At this time, neither the first sealing ring 63 nor the second sealing ring 67 is compressed, thereby avoiding frictional wear.

[0046] Then, the motor 41 is started, which drives the output shaft 42 to rotate. The output shaft 42 drives the drive gear 43 to rotate, which drives the driven gear 45 to rotate. The driven gear 45 drives the rotating shaft 46 to rotate, which drives the rotating rod 47 to rotate. The rotating shaft 46 pushes the fixed shaft 49 down, which in turn pushes the first moving plate 410 down. The first moving plate 410 drives the lifting column 411 to move down. When the lifting column 411 moves down, it opens the first connecting rod 412 to both sides. The first connecting rod 412 pushes the second connecting rod 413 to move outward, so that the second connecting rod 413 and the third connecting rod 414 cooperate to push the second moving plate 415 down. The second moving plate 415 drives the plug 418 to be inserted into the socket 65, completing the electrical connection. At this time, the second connecting rod 413 and the third connecting rod 414 are in a straight line, thus locking the plug 418.

[0047] First, the water pump 72 is started to pump the clean water in the tank 71 into the first pipe 73. At this time, the liquid enters the second pipe 74 through the filter screen 75 to prevent impurities from entering the fuel injector 6 to be tested. Then, the liquid enters the main body 61 in sequence through the first pipe 73, the oil supply pipe 54, and the oil inlet pipe 64, while the nozzle 62 is in the closed state. The sealing performance of the fuel injector 6 to be tested is checked by the pressure test gauge 56. Then, the nozzle 62 is opened by the electronic control to spray the liquid into the transparent test tube 3. The function of the nozzle 62 is checked by the scale on the transparent test tube 3. After the test is completed, the liquid is pumped back into the storage tank 7 by the return pump 8 to avoid waste.

[0048] When it is necessary to unplug the plug 418, simply reverse the motor 41 to make the first moving plate 410 drive the lifting column 411 to move upward, so that the first connecting rod 412 pulls the second connecting rod 413 to retract inward, thereby making the second moving plate 415 move upward and unplug the plug 418.

[0049] When it is necessary to remove the fuel injector 6 to be tested, simply push the top plate 53 upward with the hydraulic rod 52. At this time, the oil injection pipe 55 pulls the fifth link 511, the fifth link 511 pulls the fourth link 510 to retract, and the fourth link 510 drives the rocker plate 512 to rotate, thereby causing the locking plate 514 to expand outward and the locking block 515 to disengage from the locking groove 66.

[0050] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention.

Claims

1. An airtightness testing device for automobile engine fuel injector production, comprising a base (1), characterized in that: A plurality of first fixing frames (2) are fixedly connected to the base (1), and a transparent test tube (3) is fixedly connected inside the first fixing frame (2). A plurality of fixing plates (9) are fixedly connected to the upper end of the base (1). A wire plugging and unplugging mechanism (4) is fixedly connected to the upper end of the base (1). A fuel injector fixing mechanism (5) is provided on the fixing plate (9). A fuel injector to be tested (6) is provided between the fuel injector fixing mechanism (5) and the transparent test tube (3). A reflux pump (8) is fixedly connected to one side of the base (1). A liquid storage tank (7) is fixedly connected to the end of the reflux pump (8) away from the base (1). The fuel injector fixing mechanism (5) includes a first fixing ring (57) fixedly connected to a fixing plate (9). A plurality of fourth connecting rods (510) are rotatably connected to the first fixing ring (57). A first cylinder (516) is fixedly connected to one end of the fourth connecting rod (510) away from the first fixing ring (57). The first cylinder (516) passes through a slidingly connected rocker plate (512). A locking plate (514) is fixedly connected to one end of the rocker plate (512) away from the first cylinder (516). A plurality of locking blocks (515) are fixedly connected to the inner side of the locking plate (514). The base (1) is fixedly connected to both sides of a base plate (51), a hydraulic rod (52) is fixedly connected to the upper surface of the base plate (51), a top plate (53) is fixedly connected to the upper end of the hydraulic rod (52), a plurality of oil injection pipes (55) are fixedly connected through the top plate (53), a pressure test gauge (56) is fixedly connected to the upper end of the oil injection pipes (55), and an oil delivery pipe (54) is fixedly connected to one side of the oil injection pipes (55). A fifth connecting rod (511) is rotatably connected to the oil injection pipe (55). The end of the fifth connecting rod (511) away from the oil injection pipe (55) is rotatably connected to the fourth connecting rod (510). Several connecting rods (58) are fixedly connected to the lower end of the first fixing ring (57). A second fixing ring (59) is fixedly connected to the end of the connecting rod (58) away from the first fixing ring (57). A second strip hole (513) is opened on the rocker plate (512). The second strip hole (513) and the first cylinder (516) slide and cooperate with each other. A second cylinder (517) is fixedly connected between the second fixing rings (59). The second cylinder (517) passes through and rotatably connects the rocker plate (512). A sealing rubber ring (518) is fixedly connected to the lower end of the oil injection pipe (55). The fuel injector (6) to be tested includes a main body (61), a nozzle (62) is fixedly connected to the lower end of the main body (61), a socket (65) is fixedly connected to the upper end of the main body (61), an oil inlet pipe (64) is fixedly connected to the upper end of the main body (61), a plurality of locking grooves (66) are provided on the outside of the oil inlet pipe (64), a first sealing ring (63) is provided on the outer sleeve of the nozzle (62), a second sealing ring (67) is provided on the outer sleeve of the oil inlet pipe (64), the liquid storage tank (7) includes a tank body (71), a water pump (72) is fixedly connected to the upper end of the tank body (71), a first pipe (73) is fixedly connected to the output end of the water pump (72), a second pipe (74) is fixedly connected to the input end of the water pump (72), and a filter screen (75) is fixedly connected to the lower end of the second pipe (74).

2. The airtightness testing device for automobile engine fuel injector production according to claim 1, characterized in that, The transparent test tube (3) includes a tube body (31) fixedly connected to the first fixing frame (2), a lower tube port (33) fixedly connected to the upper end of the tube body (31), an upper tube port (32) fixedly connected to the lower end of the tube body (31), and the lower ends of several upper tube ports (32) are interconnected.

3. The airtightness testing device for automobile engine fuel injector production according to claim 1, characterized in that, The wire plugging and unplugging mechanism (4) includes a motor (41) fixedly connected to a base (1). A pair of second fixing frames (44) are fixedly connected to the base (1). An output shaft (42) is fixedly connected to the output end of the motor (41). A drive gear (43) is fixedly connected to the end of the output shaft (42) away from the motor (41). A rotating shaft (46) is rotatably connected through the second fixing frame (44). A driven gear (45) is fixedly connected to the rotating shaft (46). The drive gear (43) and the driven gear (45) mesh with each other.

4. The airtightness testing device for automobile engine fuel injector production according to claim 3, characterized in that, Rotating rods (47) are fixedly connected to both ends of the rotating shaft (46). A first strip hole (48) is provided on the rotating rod (47). A fixed shaft (49) is slidably connected through the first strip hole (48). A first moving plate (410) is fixedly connected to the fixed shaft (49). A lifting column (411) is fixedly connected to the end of the first moving plate (410) away from the fixed shaft (49).

5. The airtightness testing device for automobile engine fuel injector production according to claim 4, characterized in that, The lifting column (411) is rotatably connected to a pair of first connecting rods (412) at the end away from the first moving plate (410). The first connecting rod (412) is rotatably connected to a second connecting rod (413) at the end away from the lifting column (411). The second connecting rod (413) is rotatably connected to a second moving plate (415) at the end away from the first connecting rod (412). The second connecting rod (413) is rotatably connected to a third connecting rod (414) at the end close to the first connecting rod (412). The third connecting rod (414) is rotatably connected to a fixed plate (9) at the end away from the second connecting rod (413). Both ends of the second moving plate (415) are slidably connected to sliding rods (416). The upper end of the sliding rod (416) is fixedly connected to the fixed plate (9). The lower end of the sliding rod (416) is fixedly connected to a limit frame (417). The lower end of the second moving plate (415) is fixedly connected to a plug (418).

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