An airtightness detection device adapted to the electric control box of new energy vehicles

Abstract

The present application relates to the technical field of detection devices, and in particular to an airtight detection device adapted to an electric control box of a new energy vehicle, which includes a frame, a suspension rod is symmetrically arranged on the inner side of the frame, a detection platform is commonly arranged at the bottom ends of the two suspension rods, a plurality of corner cylinders are arranged on the top surface of the detection platform, and a plurality of corner cylinders are enclosed to form a fixed space of the electric control box, a booster mechanism is also arranged on the top surface of the detection platform, a flow tube is arranged on the side wall of the electric control box, the booster mechanism is connected to the flow tube, and a water tank is arranged on the inner side of the frame. The present application has the effect of improving the efficiency and quality of airtight detection of electric control boxes of new energy vehicles.

Description

Technical Field

[0001] The present application relates to the technical field of detection devices, and in particular to an airtightness detection device adapted for an electric control box of a new energy vehicle. Background Art

[0002] The electric control box of new energy vehicles (also called electric control system, electronic control unit or electronic control box) is one of the most important components in new energy vehicles. It is mainly responsible for controlling and managing the work of electric motors, power batteries, charging systems and other related systems.

[0003] The current electric control box is formed by friction welding of multiple steel plates, and a cooling channel is reserved in the electric control box. In order to ensure the integrity of the welding and the sealing of the cooling channel, the cooling channel of the electric control box needs to be tested for air tightness before leaving the factory. The common way to test air tightness is to use a handheld air pipe to inflate the cooling channel, and then place the electric control box in a water tank. By observing whether there are bubbles on the front and back of the electric control box, the air tightness of the electric control box can be judged.

[0004] However, when the handheld electric control box is immersed in a water tank, the stirring of the hand will cause the water in the water tank to be turbulent, thereby affecting the observation of bubbles, resulting in the detection of the air tightness of the electric control box not only being inefficient, but also being inaccurate and low in quality. Summary of the invention

[0005] In order to improve the efficiency and quality of airtightness detection of electric control boxes of new energy vehicles, the present application provides an airtightness detection device adapted for electric control boxes of new energy vehicles.

[0006] The present application provides an airtightness detection device adapted to the electric control box of a new energy vehicle, which adopts the following technical solution:

[0007] An airtightness detection device adapted for an electric control box of a new energy vehicle comprises a frame, hangers are symmetrically arranged on the inner side of the frame, a detection platform is commonly arranged at the bottom ends of the two hangers, a plurality of corner cylinders are arranged on the top surface of the detection platform, and a plurality of corner cylinders enclose a fixed space of the electric control box, a boosting mechanism is also arranged on the top surface of the detection platform, a flow tube is arranged on the side wall of the electric control box, the boosting mechanism is connected to the flow tube, and a water tank is arranged on the inner side of the frame for lifting and lowering.

[0008] By adopting the above technical scheme, when it is necessary to conduct an air tightness test on the electric control box of a new energy vehicle, water is first stored in the water tank in advance, and then the electric control box is placed in a fixed space, and then the boost mechanism and multiple angle cylinders are started. At this time, the multiple angle cylinders fix and press the electric control box in the fixed space, and the boost mechanism is connected to the flow channel, and then the water tank is driven to rise until the stored water submerges the electric control box. Under the pressure of the boost mechanism, the air tightness of the electric control box is tested by observing whether there are bubbles overflowing from the flow channel inside the electric control box. This is repeated, which is beneficial to improving the efficiency and quality of the air tightness test of the electric control box.

[0009] Optionally, a movable platform is arranged above the detection platform, and a sliding hole is penetrated through the top surface of the movable platform, and a plurality of needles are slidably arranged in the sliding hole. The mounting surface of the electric control box is also provided with a threaded hole, and the needles are plugged into the threaded hole. The movable platform is provided with a fixing mechanism for positioning and fixing the plurality of needles, and the frame is provided with a lifting mechanism for driving the movable platform to rise and fall.

[0010] By adopting the above technical scheme, firstly, a plurality of needles are positioned and fixed respectively by a fixing mechanism so that the needles are aligned with the threaded holes on the mounting surface of the electric control box, and then the moving platform is reciprocatedly driven down by the lifting mechanism, and the moving platform reciprocates and drives the plurality of needles to descend at the same time, and the plurality of needles are respectively inserted into the threaded holes. Under the action of the needles, the needles pre-pierce the water film in the threaded holes, so that the gas in the threaded holes is discharged, and the bubbles in the threaded holes are prevented from interfering with the detection, thereby improving the quality and accuracy of the air tightness detection of the electric control box.

[0011] Optionally, the fixing mechanism includes a slide cylinder, the slide cylinder is slidably arranged in the slide hole, the needle is penetrated through the slide cylinder, the slide cylinder is provided with a lifting component for lifting the needle, protrusions are provided on both sides of the slide cylinder, the bottom surface of the protrusion is provided with a protrusion, and the top surface of the movable platform is provided with a tape, and the protrusion is clamped with the tape.

[0012] By adopting the above technical solution, when the position of the needle needs to be adjusted, the slide is driven to slide along the slide hole until the needle is aligned with the threaded hole on the mounting surface of the electric control box. During the sliding process of the slide, the slide drives the protrusion to slide through the protrusion, and when the slide is stationary, the protrusion is clamped in the cassette. At this time, the needle is positioned at the current position, which is beneficial to improve the stability of the needle position adjustment and fixation.

[0013] Optionally, the lifting assembly includes a first spring, a bracket is provided on the top surface of the slide cylinder, the first spring is arranged in the bracket, the first spring is sleeved on the needle, the side wall of the needle is provided with a ring block, one end of the first spring abuts against the top surface of the ring block, the other end of the first spring abuts against the inner top wall of the bracket, the side wall of the slide cylinder is symmetrically provided with an inverted U-step groove, the side wall of the needle is symmetrically provided with a guide block, and the guide block is slidably connected to the inverted U-step groove.

[0014] By adopting the above technical solution, when the needle is driven to move upward, the needle drives the guide block to move upward until the guide block moves to the short end of the inverted U-step groove. At this time, the needle squeezes the first spring through the ring block, and the bottom end of the needle retracts to a position close to the moving platform, which helps to avoid the unused needle from colliding and interfering with the electric control box when the moving platform descends.

[0015] Optionally, the lifting mechanism includes gears, and lifting seats are respectively provided on both sides of the mobile platform, the lifting seats are slidably sleeved on the suspension rod, and climbing teeth are provided on the inner side of the suspension rod. The gear is rotatably set in the lifting seat, the gear is meshed with the climbing teeth, and the mobile platform is provided with a locking assembly for unidirectionally locking the gear.

[0016] By adopting the above technical solution, when the mobile platform is driven to rise and fall, the mobile platform rises and falls along the suspension rod, and under the action of the climbing teeth, the climbing teeth drive the gears to rotate. When the mobile platform needs to be positioned at the current height, the gears are one-way locked by the locking assembly. At this time, the mobile platform is positioned at the current height, which is beneficial to improve the stability of the lifting and fixing of the mobile platform.

[0017] Optionally, the locking assembly includes a wedge block, a lifting rack is provided on the top surface of the movable platform, the wedge block is lifted and lowered on both sides of the lifting rack, the wedge block cooperates with the gear, and the lifting rack is provided with an elastic member for cooperating and driving the wedge block to rise and fall.

[0018] By adopting the above technical solution, the mobile platform is lifted and lowered by the lifting frame, and the wedge block is lifted and lowered by the elastic member. When the wedge block is engaged with the tooth root of the gear, the gear is allowed to rotate in one direction, and the mobile platform cannot descend at this time. When the wedge block is separated from the tooth root of the gear, the gear is allowed to rotate in two directions, and the mobile platform can be lifted and lowered freely, which is beneficial to improve the locking stability of the lifting platform.

[0019] Optionally, the elastic member is a second spring, and convex plates are respectively provided on both sides of the lifting rack, and a lifting rod is slidably provided in the convex plate, the bottom end of the lifting rod is fixedly connected to the wedge block, and a pull rod is commonly provided at the top ends of the two lifting rods, and the pull rod is slidably connected to the lifting rack, the second spring is sleeved on the lifting rod, one end of the second spring is fixedly connected to the side wall of the lifting rod, and the other end of the second spring is fixedly connected to the bottom surface of the convex plate.

[0020] By adopting the above technical solution, when the pull rod is pulled upward, the pull rod simultaneously drives the lifting rod to rise, and the lifting rod drives the wedge block to rise. During this process, the wedge block is separated from the root of the gear, and the lifting rod presses the second spring. When the pull rod is released, the second spring releases the elastic force and drives the lifting rod to descend. The lifting rod then drives the wedge block to descend and cooperate with the root of the gear, which is beneficial to improve the stability of the lifting and lowering of the wedge block.

[0021] Optionally, an air passage is provided inside the movable platform, a plurality of air blowing ports are provided on the bottom surface of the movable platform, the plurality of air blowing ports are respectively connected to the air passage, and the air passage is connected to an air blowing member.

[0022] By adopting the above technical solution, when the blowing part is started, the gas first enters the airway and then blows out from the blowing port. At this time, the blown gas can blow the electric control box, thereby blowing off the water adhering to the electric control box, preventing the water on the electric control box from dripping onto the ground, and improving the cleanliness of the processing environment.

[0023] Optionally, the compression end sleeve of the angle cylinder is provided with a rubber sleeve.

[0024] By adopting the above technical solution, under the protection of the rubber sleeve, it is helpful to avoid damage to the electric control box when the angle cylinder is compressed.

[0025] In summary, this application includes the following beneficial technical effects:

[0026] When it is necessary to conduct an air tightness test on the electric control box of a new energy vehicle, water is first stored in the water tank in advance, and then the electric control box is placed in a fixed space, and then the boost mechanism and multiple angle cylinders are started. At this time, the multiple angle cylinders fix and press the electric control box in the fixed space, and the boost mechanism is connected to the flow channel, and then the water tank is driven to rise until the stored water submerges the electric control box. Under the pressure of the boost mechanism, the air tightness of the electric control box is tested by observing whether there are bubbles overflowing from the flow channel inside the electric control box. This is repeated, which is beneficial to improving the efficiency and quality of the air tightness test of the electric control box. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the airtightness detection device adapted to the electric control box of a new energy vehicle of the present application;

[0028] Figure 2 It is a structural schematic diagram of the detection platform of the present application;

[0029] Figure 3 is a schematic diagram of the structure of the mobile station of the present application;

[0030] Figure 4 It is a structural schematic diagram of the slide barrel of the present application;

[0031] Figure 5 yes Figure 3 Magnified view of part A.

[0032] Explanation of the accompanying drawings: 1. frame; 2. suspension rod; 3. inspection table; 4. corner cylinder; 5. fixed space; 6. flow tube; 7. elevator; 8. water tank; 9. booster cylinder; 10. air nozzle; 11. threaded hole; 12. moving table; 13. sliding hole; 14. needle; 15. slide cylinder; 16. bump; 17. protrusion; 18. cassette; 19. first spring; 20. bracket; 21. ring block; 22. inverted U-step groove; 23. guide block; 24. gear; 25. lifting seat; 26. climbing gear; 27. wedge block; 28. lifting frame; 29. ​​convex plate; 30. lifting rod; 31. second spring; 32. blowing port; 33. air duct; 34. rubber sleeve; 35. pull rod; 36. electric control box. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1-5 This application is described in further detail.

[0034] See also Figure 1 and Figure 2 , an airtightness detection device adapted for an electric control box of a new energy vehicle, comprising a frame 1. The frame 1 is erected on the ground, and a suspension rod 2 is symmetrically fixedly installed on the inner side of the frame 1. The two suspension rods 2 are respectively arranged vertically, and the bottom ends of the two suspension rods 2 are commonly fixedly connected to a test bench 3. The top surface of the test bench 3 is fixedly connected to an angle cylinder 4. In this embodiment, the number of angle cylinders 4 is provided in two groups, and the two groups of angle cylinders 4 are arranged in parallel. The number of each group of angle cylinders 4 is provided in four, and the four angle cylinders 4 enclose a fixed space 5 of the electric control box 36. A booster mechanism is also installed on the top surface of the test bench 3. A cooling channel (not shown in the figure) is reserved inside the electric control box 36 during die casting, and the cooling channel is fixedly connected to a flow tube 6, and the flow tube 6 is fixedly connected to the side wall of the electric control box 36, and the booster mechanism is connected to the cooling channel through the flow tube 6. A lift 7 is fixedly installed on the inner bottom wall of the frame 1, and a water storage tank 8 is fixedly installed on the lifting end of the lift 7. The water storage tank 8 is loaded with water, and the water storage tank 8 is covered on the detection platform 3, and the water storage tank 8 is raised and lowered in the frame 1.

[0035] When it is necessary to test the air tightness of the cooling channel reserved during the die-casting of the electric control box 36 of the new energy vehicle, first place one of the electric control boxes 36 in the first fixed space, with one of the electric control boxes 36 installed facing up. Place the other electric control box 36 in the second fixed space, with the other electric control box 36 installed facing down. Then start the boost mechanism and two sets of corner cylinders 4. The corner cylinders 4 are used to press and fix the electric control box 36 in the fixed space 5, and the boost mechanism is used to flush gas into the flow tube 6. Then start the elevator 7, which drives the water tank 8 to rise until the water in the water tank 8 submerges the electric control box 36. Under the boosting effect of the boost mechanism, the air tightness of the electric control box 36 is tested by observing whether there are bubbles overflowing from the front and back of the installation of the electric control box 36. Repeat this process to complete the air tightness test of the electric control box 36.

[0036] For details, see Figure 2 The boosting mechanism includes a boosting cylinder 9 and an air nozzle 10. The boosting cylinder 9 is fixed to the top surface of the testing platform 3. The air nozzle 10 is fixed to the telescopic end of the boosting cylinder 9. The position of the air nozzle 10 corresponds to that of the flow tube 6.

[0037] When the boost cylinder 9 is started, the telescopic end of the boost cylinder 9 drives the air nozzle 10 to move toward the electric control box 36. At this time, the air nozzle 10 is sealed and inserted into the flow tube 6, which is beneficial to improve the stability of the cooling channel air tightness detection.

[0038] See also Figure 1-Figure 3 The mounting surface of the electric control box 36 also includes a threaded hole 11. Since there is gas trapped inside the threaded hole 11, when the electric control box 36 is immersed in the water, the gas in the threaded hole 11 will form bubbles. The formation of the bubbles will affect the judgment of the air tightness of the electric control box 36. Therefore, it is necessary to take out the gas in the threaded hole 11 as soon as the electric control box 36 is immersed.

[0039] Therefore, a movable platform 12 is installed on the upper side of the detection platform 3, and a sliding hole 13 is penetrated through the top surface of the movable platform 12. There are multiple sliding holes 13, and the multiple sliding holes 13 are arranged along the length direction of the movable platform 12. There are multiple needles 14 installed in the sliding holes 13, and the multiple needles 14 are respectively plugged into the threaded holes 11.

[0040] See also Figure 3 and Figure 4In order to adjust and fix the position of the needle 14, the mobile platform 12 is also equipped with a fixing mechanism. The fixing mechanism includes a slide 15, which is slidably installed in the slide hole 13. The needle 14 slides through the slide 15, and the slide 15 is equipped with a lifting assembly, which is used to cooperate and drive the needle 14 to rise and fall. The side wall of the slide 15 is symmetrically fixedly connected with a protrusion 16, and the bottom surface of the protrusion 16 is fixedly connected with a protrusion 17. The top surface of the mobile platform 12 is fixedly connected with a card belt 18, and the protrusion 17 is clamped with the card belt 18.

[0041] When the position of the needle 14 needs to be adjusted so that the needle 14 is aligned with the threaded hole 11 on the mounting surface of the electric control box 36, the slide 15 is first driven to move, and the slide 15 thereby drives the needle 14 to move. In the process of the slide 15 sliding, the slide 15 drives the protrusion 16 to move, and the protrusion 16 drives the protrusion 17 to slide closely along the length direction of the card belt 18. After the movement of the slide 15 is released, since the protrusion 17 is engaged in the card belt 18, the slide 15 is fixed at the current position, and the needle 14 is aligned with the threaded hole 11.

[0042] For details, see Figure 4 The lifting assembly includes a first spring 19, a bracket 20 is fixedly connected to the top surface of the slide 15, and the needle 14 passes through the bracket 20. The first spring 19 is installed in the bracket 20, and the first spring 19 is sleeved on the needle 14. The side wall of the needle 14 is fixed with a ring block 21, one end of the first spring 19 abuts against the top surface of the ring block 21, and the other end of the first spring 19 abuts against the inner top wall of the bracket 20. The side wall of the slide 15 is symmetrically penetrated with an inverted U-step groove 22, wherein the inverted U-step groove 22 includes a short end and a long end. The side wall of the needle 14 is symmetrically fixedly connected with a guide block 23, and the guide block 23 is slidably connected to the inverted U-step groove 22.

[0043] The positions and numbers of the threaded holes 11 of different models of electric control boxes 36 are different. In order to prevent the unused needles 14 from colliding with the electric control box 36 when the moving platform 12 descends, the unused needles 14 need to be moved upward. When the needle 14 is driven upward, the needle 14 drives the guide block 23 to move upward at the long end, and the needle 14 presses the first spring 19 through the ring block 21. When the guide block 23 rises to the connection between the long end and the short end, the needle 14 is rotated, and the needle 14 drives the guide block 23 to rotate to the short end, and then the needle 14 is released, the first spring 19 releases the elastic force, and drives the needle 14 to move downward through the ring block 21. At this time, the guide block 23 is clamped at the short end of the inverted U-step groove 22, and the needle 14 is higher than the height before adjustment.

[0044] See also Figure 3 and Figure 5In order to improve the stability of the lifting of the mobile platform 12, the frame 1 is equipped with a lifting mechanism, which includes a gear 24. The two sides of the mobile platform 12 are fixedly connected with lifting seats 25, which are slidably sleeved on the suspension rods 2. The opposite sides of the two suspension rods 2 are fixedly connected with climbing teeth 26, and the gear 24 is rotatably installed in the lifting seats 25, and the gear 24 is meshed with the climbing teeth 26.

[0045] In addition, in order to facilitate the one-way locking of the moving platform 12, so that the moving platform 12 is positioned and fixed at the current height position without external force, the moving platform 12 is also equipped with a locking assembly. The locking assembly includes a wedge block 27, and a lifting frame 28 is fixedly connected to the top surface of the moving platform 12. The wedge block 27 is located above the gear 24, and the wedge block 27 is located on both sides of the lifting frame 28. The lifting frame 28 is equipped with an elastic member, which is used to cooperate with the wedge block 27 to move up and down.

[0046] The elastic member is a second spring 31. The two sides of the lifting frame 28 are fixedly connected with convex plates 29, and a lifting rod 30 is slidably penetrated in the convex plate 29, and the bottom end of the lifting rod 30 is fixedly connected to the top surface of the wedge block 27. The top ends of the two lifting rods 30 are commonly connected with a pull rod 35, and the pull rod 35 penetrates the lifting frame 28. The second spring 31 is sleeved on the lifting rod 30, and one end of the second spring 31 is fixedly connected to the side wall of the lifting rod 30, and the other end of the second spring 31 is fixedly connected to the bottom surface of the convex plate 29.

[0047] In the natural state of the second spring 31, the second spring 31 drives the wedge block 27 to move downward through the pull rod 35, so that the wedge block 27 always fits the tooth root of the gear 24. By limiting the rotation direction of the gear 24, the mobile platform 12 can move upward in one direction and cannot move downward. When the pull rod 35 is driven to move upward, the pull rod 35 simultaneously drives the two lifting rods 30 to move upward, and the lifting rods 30 drive the wedge block 27 to move upward. At this time, the lifting rod 30 presses the second spring 31, and the wedge block 27 is separated from the gear 24. At this time, the gear 24 is free from the restriction and rotates freely, and the mobile platform 12 is freely raised and lowered to the required height.

[0048] It is worth noting that participating Figure 3 When the mobile platform 12 is driven to freely rise and fall, the operator's hands hold the lifting frame 28 and the pull rod 35 at the same time, which is conducive to driving the mobile platform 12 to freely rise and fall back and forth through the lifting frame 28 on the basis of releasing the restriction of the gear 24 at the same time. And when the mobile platform 12 needs to be positioned, the operator releases his hands, and under the action of the second spring 31, the wedge block 27 is reset to lock the gear 24 in one direction, and finally the mobile platform 12 is kept at the current height position.

[0049] See also Figure 3In order to prevent the water on the electric control box 36 from dripping onto the ground after the electric control box 36 is inspected, an air passage 33 is passed through the interior of the mobile platform 12, and a blow port 32 is provided on the bottom surface of the mobile platform 12. There are multiple blow ports 32, and the multiple blow ports 32 are respectively connected to the air passage 33. The air passage 33 is also fixedly connected to a blow piece (not shown in the figure), wherein the blow piece is an air pump.

[0050] When the electric control box 36 is inspected and separated from the fixed space 5, the blowing part is started. The gas passes through the air passage 33 and is ejected from the plurality of blowing ports 32. At this time, the gas blows the electric control box 36, thereby blowing the water stored on the electric control box 36 into the water storage tank 8.

[0051] In addition, the lifting and lowering of the movable platform 12 is also helpful in controlling the blowing range, thereby improving the drying efficiency.

[0052] It is worth mentioning that see Figure 2 The pressing ends of the plurality of corner cylinders 4 are respectively fixedly sleeved with rubber sleeves 34. The rubber sleeves 34 are used to protect the electric control box 36 to prevent the pressing ends of the corner cylinders 4 from damaging the electric control box 36 when pressing the electric control box 36.

[0053] Working principle of an airtightness detection device adapted to the electric control box of new energy vehicles:

[0054] When the air tightness test of the cooling channel reserved during die casting of the electric control box 36 of the new energy vehicle is required, one of the electric control boxes 36 is first placed in the first fixed space, with the installation surface of one of the electric control boxes 36 facing upward. The other electric control box 36 is placed in the second fixed space, with the installation surface of the other electric control box 36 facing downward.

[0055] Then, the boost cylinder 9 and the two groups of corner cylinders 4 are started. The boost cylinder 9 drives the air nozzle 10 to be sealed and plugged into the flow tube 6 of the electric control box 36. The two groups of corner cylinders 4 respectively press and fix the electric control box 36 in the fixed space 5.

[0056] The number of needles 14 required to be used is adjusted according to the model of the electric control box 36, and the needles 14 are pre-aligned with the threaded holes 11 of the electric control box 36. Then the elevator 7 is started, and the elevator 7 drives the water storage tank 8 to rise until the water in the water storage tank 8 submerges the electric control box 36. Then the operator's hand holds the lifting frame 28 and the pull rod 35 at the same time to release the one-way lock of the gear 24, and drives the moving platform 12 to rise and fall back and forth. The moving platform 12 finally drives the needles 14 to reciprocate and descend. At this time, the needles 14 are reciprocally inserted into the threaded holes 11, thereby bringing out the air in the threaded holes 11. After the air is brought out, the moving platform 12 is reset and the moving platform 12 is one-way locked.

[0057] Next, the flow tube 6 is inflated through the air nozzle 10, and bubbles are observed to overflow from the front and back sides of the electric control box 36, so as to detect the air tightness of the electric control box 36. This process is repeated to complete the air tightness test of the electric control box 36.

[0058] In summary, the electric control box 36 is fixed in the fixed space 5 and immersed in the water storage tank 8. Under the pressure of the boosting mechanism, the air tightness of the electric control box 36 is tested by observing whether there are bubbles overflowing from the flow channel inside the electric control box 36. This reduces the need to manually immerse the electric control box 36 for observation, and improves the efficiency, accuracy and quality of the air tightness test of the electric control box 36.

[0059] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An airtightness detection device adapted for an electric control box of a new energy vehicle, comprising a frame (1), characterized in that: The inner side of the frame (1) is symmetrically provided with suspension rods (2), the bottom ends of the two suspension rods (2) are jointly provided with a detection platform (3), the top surface of the detection platform (3) is provided with a plurality of corner cylinders (4), the plurality of corner cylinders (4) enclose a fixed space (5) of an electric control box (36), the top surface of the detection platform (3) is also provided with a booster mechanism, the side wall of the electric control box (36) is provided with a flow tube (6), the booster mechanism is connected to the flow tube (6), and a water storage tank (8) is provided on the inner side of the frame (1) for lifting; A movable platform (12) is arranged above the detection platform (3), a sliding hole (13) is arranged through the top surface of the movable platform (12), a plurality of needles (14) are slidably arranged in the sliding hole (13), a mounting surface of the electric control box (36) is also provided with a threaded hole (11), the needles (14) are plugged into the threaded hole (11), the movable platform (12) is provided with a fixing mechanism for positioning and fixing the plurality of needles (14), and the frame (1) is provided with a lifting mechanism for driving the movable platform (12) to rise and fall; The fixing mechanism comprises a slide cylinder (15), the slide cylinder (15) is slidably arranged in the slide hole (13), the needle (14) is penetrated through the slide cylinder (15), the slide cylinder (15) is provided with a lifting component for lifting the needle (14), both sides of the slide cylinder (15) are provided with protrusions (16), the bottom surface of the protrusion (16) is provided with a protrusion (17), the top surface of the movable platform (12) is provided with a card belt (18), and the protrusion (17) is engaged with the card belt (18); The lifting assembly comprises a first spring (19), a bracket (20) is arranged on the top surface of the slide cylinder (15), the first spring (19) is arranged in the bracket (20), the first spring (19) is sleeved on the needle (14), a ring block (21) is arranged around the side wall of the needle (14), one end of the first spring (19) abuts against the top surface of the ring block (21), and the other end of the first spring (19) abuts against the inner top wall of the bracket (20), the side wall of the slide cylinder (15) is symmetrically provided with an inverted U-step groove (22), the side wall of the needle (14) is symmetrically provided with a guide block (23), and the guide block (23) is slidably connected to the inverted U-step groove (22).

2. According to claim 1, an airtightness detection device adapted to an electric control box of a new energy vehicle is characterized in that: The lifting mechanism comprises a gear (24), and lifting seats (25) are respectively arranged on both sides of the moving platform (12), the lifting seats (25) are slidably sleeved on the suspension rod (2), and climbing teeth (26) are arranged on the inner side of the suspension rod (2), the gear (24) is rotatably arranged in the lifting seat (25), the gear (24) is meshed with the climbing teeth (26), and the moving platform (12) is provided with a locking component for unidirectionally locking the gear (24).

3. According to claim 2, the airtightness detection device adapted to the electric control box of a new energy vehicle is characterized in that: The locking assembly comprises a wedge block (27), a lifting frame (28) is arranged on the top surface of the moving platform (12), the wedge block (27) is arranged on both sides of the lifting frame (28) for lifting, the wedge block (27) cooperates with the gear (24), and the lifting frame (28) is provided with an elastic member for cooperating and driving the wedge block (27) to rise and fall.

4. According to claim 3, the airtightness detection device adapted to the electric control box of a new energy vehicle is characterized in that: The elastic member is a second spring (31), and convex plates (29) are respectively provided on both sides of the lifting frame (28), and a lifting rod (30) is slidably provided in the convex plate (29), and the bottom end of the lifting rod (30) is fixedly connected to the wedge block (27), and a pull rod (35) is commonly provided at the top end of the two lifting rods (30), and the pull rod (35) is slidably connected to the lifting frame (28), and the second spring (31) is sleeved on the lifting rod (30), one end of the second spring (31) is fixedly connected to the side wall of the lifting rod (30), and the other end of the second spring (31) is fixedly connected to the bottom surface of the convex plate (29).

5. According to claim 1, the airtightness detection device adapted to the electric control box of a new energy vehicle is characterized in that: An air passage (33) is provided inside the movable platform (12), a plurality of air blowing ports (32) are provided on the bottom surface of the movable platform (12), the plurality of air blowing ports (32) are respectively connected to the air passage (33), and the air passage (33) is connected to an air blowing member.

6. The airtightness detection device adapted to the electric control box of a new energy vehicle according to claim 1 is characterized in that: The compression end sleeve of the corner cylinder (4) is provided with a rubber sleeve (34).

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