CN209802609U - A fixture for detecting three-phase power connection lines of electric vehicles - Google Patents

Abstract

The utility model discloses a fixture for detecting the three-phase power connection line of an electric vehicle, which comprises a pressing device for pressing a workpiece and a lower fixture for clamping the workpiece in cooperation with the pressing device. The lower fixture is provided with a A cavity for detecting the tightness of the workpiece, the bottom of the cavity is provided with an air inlet pipe connected to the air tightness tester, and the air inlet pipe is arranged on the side of the lower fixture; the pressing device includes a fixed frame body, a movable Press bar and the wrench used to drive the press bar to move, the press bar is hinged with the wrench through the hinged plate assembly so that the press bar slides back and forth on the fixed frame body; the press bar of the utility model moves downward under the control of the wrench and Compress the workpiece, and then the air tightness tester uses the pressure drop method to detect whether there is air leakage in the cavity to know the tightness of the workpiece. It not only has the advantages of simple structure, easy operation, convenient maintenance, and low cost, but also improves Efficiency of testing the airtightness of electric vehicle three-phase power connection lines.

Description

A fixture for detecting three-phase power connection lines of electric vehicles

technical field

The utility model relates to a fixture for detecting three-phase power connection lines of electric vehicles.

Background technique

The existing electric vehicle three-phase power connection lines are all required to meet the inspection standard of IP67. The so-called IP67 standard refers to the protection safety level. IP is the abbreviation of Ingress Protection Rating (or International Protection code), which defines the protection ability of an interface against liquid and solid particles. IP is followed by 2 digits, the first one is the solid state protection level, the range is 0-6, which respectively represent the protection from large particles of foreign matter to dust; the second is the liquid protection level, the range is 0-8, which respectively represent Protection from vertical water drops to bottom pressure situations. The higher the number, the stronger the ability. The explanation of IP67 is to protect against dust inhalation (overall protection against contact, protection against dust penetration); protection against short-term immersion (anti-immersion). However, when the production is completed, the three-phase power connection line of the electric vehicle is generally directly assembled on the vehicle without being tested for sealing, and there is a hidden danger of sealing. Therefore, it is urgent to develop a device for detecting three-phase power connection lines of electric vehicles.

Contents of the invention

The technical problem to be solved by the utility model is to provide a fixture for detecting the three-phase power connection line of an electric vehicle, so as to solve the deficiencies in the prior art.

In order to solve the above technical problems, the technical solution of the utility model is: a fixture for detecting the three-phase power connection line of an electric vehicle, including a pressing device for pressing the workpiece and a lower fixture for clamping the workpiece in cooperation with the pressing device , the lower fixture is provided with a cavity for detecting the airtightness of the workpiece, the bottom of the cavity is provided with an air inlet pipe connected to the air tightness tester, and the air inlet pipe is arranged on the side of the lower fixture; The pressing device includes a fixed frame body, a movable pressing bar and a wrench for driving the pressing bar to move, and the pressing bar is hinged to the wrench through a hinge plate assembly so that the pressing bar slides back and forth on the fixing frame body.

As an improvement, the fixed frame body is provided with an upper hinge hole for the hinged plate assembly and a guide sleeve for guiding the movement of the pressure rod, and the upper hinge hole and the guide sleeve are on the same vertical line.

As an improvement, the hinge plate assembly includes an inner hinge plate and an outer hinge plate, the outer hinge plate is located on both sides of the inner hinge plate, one end of the inner hinge plate is hinged on the upper hinge hole, and the inner hinge plate The other end is hinged with the wrench and the outer hinged plate at the same time, and the other end of the outer hinged plate is hinged with the top of the pressure rod.

As an improvement, a rubber pad is provided at the bottom of the pressure rod.

As an improvement, a sealing ring is provided on the workpiece, and the sealing ring is used to seal the gap between the workpiece and the lower clamp.

Compared with the prior art, the beneficial effect of the utility model is: the pressure rod of the utility model moves downward under the control of the wrench and compresses the workpiece, and then the air tightness tester uses the pressure drop method to detect whether the Air leakage can be used to know the tightness of the workpiece. It not only has the advantages of simple structure, easy operation, convenient maintenance, and low cost, but also improves the efficiency of testing the tightness of the three-phase power connection line of electric vehicles.

Description of drawings

Fig. 1 is the structural representation of the initial state of the utility model.

Fig. 2 is a structural schematic diagram of the utility model regarding the top view angle of the lower fixture.

Fig. 3 is a structural schematic diagram of the main viewing angle of the utility model.

Fig. 4 is a schematic diagram of the state of the utility model after the pressing device presses the workpiece.

Fig. 5 is an enlarged view of A in Fig. 3 .

Fig. 6 is a schematic structural diagram of the sealing ring of the present invention.

Fig. 7 is a schematic structural diagram of the utility model when the wrench is pulled.

Fig. 8 is a working principle diagram of the utility model.

Fig. 9 is a structural schematic diagram of the utility model regarding the right viewing angle of the workpiece.

In the picture:

Air tightness tester 1, pressing device 2, lower fixture 3, cavity 4, air intake pipe 5, hinge plate assembly 6, rubber pad 7, workpiece 8, pin 9, pressure sensor 10, fixing frame body 20, pressure sensor Rod 21, wrench 22, inner hinge plate 60, outer hinge plate 61, sealing ring 80, connecting terminal 81, upper hinge hole 200, guide sleeve 201, anti-slip rubber sleeve 220.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in further detail.

As shown in Fig. 1, Fig. 2, Fig. 3, Fig. 6, Fig. 8 and Fig. 9, a fixture for detecting three-phase power connection lines of electric vehicles includes a pressing device 2 for pressing a workpiece 8 and a matching The lower clamp 3 of the lower pressure device 2 clamping the workpiece 8 is also used in this technical solution with an air tightness tester 1, and the air tightness tester 1 adopts the air tightness test of YMJ-ZP or YMJ-ZE The instrument uses a pressure drop detection principle to detect the tightness of the workpiece 8. What needs to be further explained here is that the workpiece 8 composed of the three-phase power connection line of the electric vehicle has three connection terminals 81. In order to avoid the connection terminals 81 of the workpiece 8 when detecting the tightness of the workpiece 8, the lower clamp 3 is provided with a In order to detect the cavity 4 of the workpiece 8, the number of the cavity 4 can be set according to the actual situation. In this technical solution, the connecting terminals 81 of the workpiece 8 respectively extend into the corresponding cavity 4, and the workpiece 8 is provided with There is a sealing ring 80 for sealing the gap between the workpiece 8 and the lower clamp 3, so that an independent sealed inner cavity is formed between the workpiece 8 and the cavity 4, and the bottom of the cavity 4 is provided with a communication air tightness tester 1 The air intake pipe 5 is arranged on the side of the lower fixture 3 . The air tightness tester 1 rushes compressed air into the cavity 4 through the intake pipe 5, and after a period of pressure maintaining, the pressure sensor 10 of the airtightness tester 1 can detect the pressure in the cavity 4 through the intake tube 5 Whether there is a drop, judge whether there is leakage of the workpiece 8 by the pressure change displayed by the air tightness tester 1, if there is a leak, the pressure in the cavity 4 will drop, when the pressure is lower than the set When the pressure is high, the air tightness tester 1 will alarm. This detection method has the advantages of high efficiency, strong versatility, high detection rate, non-destructive testing, etc., and can detect multiple products at the same time according to the actual product setting. Fixtures to improve the efficiency of detection. The air tightness tester 1 of this method is matched with the fixture of the utility model, which has strong versatility and can be applied to semi-sealed and fully-sealed products, and can also be used to pump air into a negative pressure inside the semi-sealed workpiece to detect whether the product is There is a leak.

As shown in Fig. 1, Fig. 3, Fig. 4, Fig. 5 and Fig. 7, the pressing device 2 includes a fixed frame body 20, a movable pressing bar 21 and a wrench 22 for driving the pressing bar 21 to move. The rod 21 is hinged with the wrench 22 through the hinge plate assembly 6 so that the pressing rod 21 slides back and forth on the fixed frame body 20 . The hinges described in this embodiment all use pins 9 for hinges. As an improvement, in order to increase the friction of the wrench 22, an anti-slip rubber sleeve 220 is provided on the wrench 22, so that the wrench 22 can be pulled stably and prevent slipping during the pulling process. Specifically, the fixed frame body 20 is provided with an upper hinge hole 200 for hinged hinge plate assembly 6 and a guide sleeve 201 for guiding the movement of the pressure rod 21, the upper hinge hole 200 and the guide sleeve 201 are arranged on the same vertical On the line, the pressure rod 21 runs through the guide sleeve 201 and moves up and down. After the pressure rod 21 presses the workpiece 8, the sealing ring 80 of the workpiece 8 is attached to the upper surface of the lower fixture 3, thereby sealing the cavity 4 and preventing the workpiece 8 from contacting the lower fixture. The gap between 3 leaks air to ensure the accuracy of the sealing test. In this technical solution, the hinged plate assembly 6 includes an inner hinged plate 60 and two outer hinged plates 61, the two outer hinged plates 61 are located on both sides of the inner hinged plate 60, and one end of the inner hinged plate 60 is hinged on On the upper hinge hole 200 , the other end of the inner hinge plate 60 is integrated with the wrench 22 and hinged with the outer hinge plate 61 , and the other end of the outer hinge plate 61 is hinged with the top of the pressing rod 21 . Such a design can make when the wrench 22 is pulled, at first the inner hinge plate 60 rotates counterclockwise downwards around the upper hinge hole 200 under the drive of the wrench 22, and the outer hinge plate 61 hinged with the inner hinge plate 60 is in the direction of the wrench. Driven by 22, the upper hinge hole 200 is also rotated counterclockwise outwards, and the outer hinge plate 61 can avoid the upper hinge hole 200 while rotating outwards, so as to drive the pressure rod 21 to move downward, so as to realize the rotary motion of the wrench 22 Converted into a linear motion of the pressing rod 21, the workpiece 8 is pressed against the surface of the lower clamp 3. As an improvement, the bottom of the pressing rod 21 is provided with a rubber pad 7, and the function of the rubber pad 7 is to increase the contact area between the pressing rod 21 and the workpiece 8, so that the pressing rod 21 can further press the workpiece 8 on the lower clamp 3 , cooperate with the seal of the sealing ring 80, so that the cavity 4 can form a sealed cavity. In addition, the wrench 22 can be replaced by an air cylinder or a hydraulic cylinder or other driving devices, and the sliding of the pressing bar 21 can also be realized by controlling the air cylinder or hydraulic cylinder to drive the pressing bar 21 .

Working principle of the utility model:

In the first step, the connection terminals 81 of the workpiece 8 are correspondingly inserted into the cavity 4, so that the workpiece 8 is positioned on the lower fixture 3, and the sealing ring 80 of the workpiece 8 is in contact with the upper surface of the lower fixture 3 at this time, as shown in the figure 1. Then pull the wrench 22 counterclockwise, see Fig. 7, under the drive of the wrench 22, the inner hinge plate 60 also rotates counterclockwise downwards around the upper hinge hole 200, and the rotation of the inner hinge plate 60 drives the outer hinge plates 61 on both sides Avoid the upper hinge hole 200 and rotate downward synchronously around the hinge hole 200 to push the pressure rod 21 to move downward. The downward movement of the pressure rod 21 makes the rubber pad 7 at the bottom of the pressure rod 21 contact with the workpiece 8, and with the wrench 22 Finally, the rubber pad 7 presses the workpiece 8 on the lower fixture 3 under the pressure of the pressure rod 21, as shown in Figure 4, at this time, the sealing ring 80 of the workpiece 8 is squeezed under the pressure of the pressure rod 21 Compression deformation, thereby sealing the gap between the workpiece 8 and the lower clamp 3, at this time, the compression of the workpiece 8 is completed.

The second step is to start the air tightness detector 1 connected to the power supply, and the air tightness detector 1 fills the cavity 4 with precise compressed air through the intake pipe 5, and the amount of compressed air is 5kpa to 100kpa. In this embodiment The compressed air volume is preferably 50kpa. The compressed air of 50kpa is slowly charged into the cavity 4, and the inflation time is set to 50 seconds, so as to prevent damage to the workpiece 8 caused by excessive inflation. When the inflation amount reaches 50kpa, the air tightness detector 1 cuts off the inflation circuit, so that the compressed air of 50kpa is stored in the cavity 4 and the intake pipe 5 . After 10 seconds of pressure holding time, at this time, set the detection time of the air tightness detector 1 to 10 seconds, that is, after the inflation volume reaches 50kpa, the pressure sensor 10 of the air tightness detector 1 starts, and the pressure sensor 10 and continue to work for 10 seconds to continuously detect the pressure in the chamber 4 to ensure the accuracy of the tightness detection. If the workpiece 8 leaks, the pressure in the cavity 4 will decrease, and when the pressure is lower than the set pressure (set to 49.5kpa in this embodiment), the air tightness detector 1 will send out an alarm to remind the operation personnel. If the workpiece 8 does not leak, the workpiece 8 is acceptable. After the detection is completed, the air tightness detector 1 discharges the compressed air. After detecting a workpiece 8, pull the wrench 22 in the opposite direction, so that the pressure rod 21 is out of contact with the workpiece 8, the workpiece 8 can be taken out from the lower fixture 3 and another workpiece 8 is placed for detection, and the subsequent detection process follows The above-mentioned detection process is the same and will not be repeated here.

In summary, the utility model has the advantages of simple structure, easy operation, convenient maintenance, and low cost. Air is used as the medium to detect the sealing of the workpiece 8, which not only does not cause damage to the workpiece 8 (that is, non-destructive testing), but also improves In order to detect the efficiency of the tightness of the three-phase power connection line of the electric vehicle.

The preferred specific embodiments of the present utility model have been described in detail above. It should be understood that those skilled in the art can make many modifications and changes according to the concept of the utility model without creative efforts. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the prior art should be within the scope of protection defined by the claims .

Claims (5)

1. A fixture for detecting three-phase power connection lines of electric vehicles, characterized in that it includes a pressing device (2) for pressing the workpiece (8) and clamping the workpiece (8) with the pressing device (2). ), the lower fixture (3) is provided with a chamber (4) for testing the airtightness of the workpiece (8), and the bottom of the chamber (4) is provided with a connected air tightness tester The air intake pipe (5) of (1), the air intake pipe (5) is arranged on the side of the lower fixture (3); The pressing device (2) includes a fixed frame body (20), a movable pressing rod (21) and a wrench (22) for driving the pressing rod (21) to move, and the pressing rod (21) passes through the hinged plate assembly (6) Hinge with the wrench (22) so that the pressure rod (21) slides back and forth on the fixed frame body (20). 2. The fixture for detecting the three-phase power connection line of an electric vehicle according to claim 1, characterized in that: the fixed frame body (20) is provided with an upper hinge hole ( 200) and the guide sleeve (201) used to guide the movement of the pressure rod (21), the upper hinge hole (200) and the guide sleeve (201) are on the same vertical line. 3. The fixture for detecting three-phase power connection lines of electric vehicles according to claim 2, characterized in that: the hinge plate assembly (6) includes an inner hinge plate (60) and an outer hinge plate (61), the The outer hinge plate (61) is located on both sides of the inner hinge plate (60), one end of the inner hinge plate (60) is hinged on the upper hinge hole (200), and the other end of the inner hinge plate (60) is connected to the The wrench (22) has an integral structure and is hinged with the outer hinged plate (61), and the other end of the outer hinged plate (61) is hinged with the top end of the pressure rod (21). 4. The fixture for detecting the three-phase power connection line of an electric vehicle according to claim 1, characterized in that: a rubber pad (7) is provided at the bottom of the pressure rod (21). 5. The fixture for detecting three-phase power connection lines of electric vehicles according to any one of claims 1 to 4, characterized in that: a sealing ring (80) is provided on the workpiece (8), and the The sealing ring (80) is used to seal the gap between the workpiece (8) and the lower clamp (3).