EMI (Electro-Magnetic Interference) testing device for electric power supply

Abstract

The invention relates to the field of EMI testing devices, in particular to an EMI testing device for an electric power supply, which comprises a casing, three connecting mechanisms are arranged on the outer side wall of the casing in an array, the connecting mechanisms are used for connecting a zero line, a ground line and a live line of a power supply wire, and each connecting mechanism comprises a connecting shell fixedly connected to the outer side wall of the casing, the inner bottom wall of the connecting shell is fixedly connected with a wiring board; the two clamping seats are symmetrically connected to the inner wall of the connecting shell in a sliding mode, and clamping grooves are formed in the side walls of the connecting seats; according to the invention, the clamping seat and the U-shaped pressing plate are arranged, the wire is actively sent into the connecting shell and sent out of the connecting shell through the clamping seat, so that the wire connecting and dismounting difficulty is reduced, meanwhile, the wire is clamped and limited through the clamping seat, the stability of the wire in the connecting process is improved, and the test stability is improved.

Description

Technical Field

[0001] The invention relates to the field of EMI testing devices, and in particular to an EMI testing device for electric power supply. Background Art

[0002] EMI testing, also known as electromagnetic interference testing, refers to the phenomenon that electromagnetic waves generated by electronic equipment at work interfere with other electronic equipment. This interference can be transmitted through conductive media or through space radiation. Through EMI testing, it can be ensured that the power supply meets the established requirements and regulations at all stages of design, production and use, thereby improving the reliability of the power supply.

[0003] For example, the invention patent with publication number CN108872880A discloses a switching power supply EMI test device and method. The device includes a high-frequency transformer, a receiver, an artificial power network, an electric power meter and a sliding rheostat. The high-frequency transformer includes a primary winding and a plurality of secondary windings. The receiver, the artificial power network, the primary winding and the secondary winding are connected in sequence, and the secondary winding is connected to the sliding rheostat via the electric power meter.

[0004] In the prior art, during the EMI test of electronic equipment, it is necessary to connect the neutral wire, ground wire and live wire of the power line on the electronic equipment to the artificial power network. During the connection process, the electric wire needs to be fixed to the artificial power network by bolts, and the bolts are removed after the test. The operation is cumbersome, and it is difficult to ensure the stability of the electric wire connection. The electric wire is easily affected by external forces and may fall off.

[0005] To this end, the present invention proposes an EMI testing device for an electric power supply to solve the above-mentioned problem. Summary of the invention

[0006] To achieve the above purpose, the technical solution adopted by the present invention is: an EMI test device for electric power supply, comprising a housing, wherein the outer wall array of the housing is provided with three connecting mechanisms, wherein the connecting mechanisms are used to connect the neutral wire, the ground wire and the live wire of the power supply wire, and the connecting mechanisms include: A connecting shell, wherein the connecting shell is fixedly connected to the outer wall of the casing, and a wiring board is fixedly connected to the inner bottom wall of the connecting shell; Two clamping seats, the two clamping seats are symmetrically slidably connected to the inner wall of the connecting shell, and the side walls of the connecting seats are provided with a clamping groove; Four guide grooves, the four guide grooves are symmetrically arranged on the upper and lower sides of the housing, and the guide grooves have a first straight groove and a first oblique groove; A first connecting pin, one end of which is fixedly connected to the outer side wall of the clamping seat, and the other end of which is slidably connected to the guide groove at a corresponding position; A first pushing component, the first pushing component is used to push the two clamping seats to move left and right; A U-shaped pressing plate, the U-shaped pressing plate is slidably connected to the inner side wall of the connecting shell at a position corresponding to the wiring board; The second pushing component is used to push the U-shaped pressing plate to move up and down.

[0007] Preferably, the first pushing component comprises: Four first driving plates, which are respectively and symmetrically slidably connected to the inner side wall of the connecting shell; A first driving groove, the first driving groove is arranged on the first driving plate, and the first driving groove has a second straight groove and a second oblique groove; Four L-shaped push rods, one end of each of the four L-shaped push rods is fixedly connected to the first driving plate, and the other end of each of the four L-shaped push rods is slidably connected to the side wall of the end of the clamping seat; Two pushing blocks, the two pushing blocks symmetrically penetrate the inner wall of the connecting shell, the pushing blocks are slidably connected to the connecting shell, an elastic connecting piece is arranged between the pushing blocks and the connecting shell, the side walls of the pushing blocks are symmetrically fixedly connected with a second connecting pin, and the second connecting pin is slidably connected in the first driving groove.

[0008] Preferably, the second pushing component comprises: Two second driving plates, the two second driving plates are symmetrically fixedly connected to two ends of the U-shaped pressing plate; a second driving groove, the second driving groove being arranged on the second driving plate, the second driving groove having a third oblique groove and a third straight groove; Two third connecting pins, one end of the two third connecting pins is fixedly connected to the push block, and the other end is slidably connected in the second driving groove.

[0009] Preferably, it also includes: Two semi-annular clamping plates, the two semi-annular clamping plates are respectively slidably connected to the ends of the clamping seat at corresponding positions; The third pushing assembly is used to push the two semi-annular clamping plates so that the two semi-annular clamping plates move left and right along the clamping seat.

[0010] Preferably, the third pushing assembly includes: Two racks, the two racks are respectively fixedly connected to two semi-annular clamping side walls; Two rotating seats, the two rotating seats are respectively fixedly connected to the ends of the two clamping seats; Two gears, the two gears are rotatably connected to two rotating seats respectively, and the gears are meshed with racks at corresponding positions; A rotary drive mechanism is used to drive the gear to rotate so that the semi-annular clamp at the corresponding position moves along the clamping seat to pull the power cord.

[0011] Preferably, the rotary drive mechanism comprises: Two flip blocks, the two flip blocks are coaxially fixed with the gears at corresponding positions; Two torsion springs, one end of each of the two torsion springs is fixedly connected to the flip block at the corresponding position, and the other end of each of the two torsion springs is fixedly connected to the rotating seat at the corresponding position; Two L-shaped push plates are symmetrically fixedly connected to the inner wall of the connecting shell, and one end side wall of the L-shaped push plate is in contact with the flip block.

[0012] Preferably, the elastic connecting member comprises: Two first sliding rods, the two first sliding rods are symmetrically fixedly connected to the outer side wall of the connecting shell, and the pushing block is slidably connected to the two first sliding rods; Two return springs are respectively sleeved on the surfaces of the two first slide bars, and two ends of the two return springs are respectively fixedly connected to the side walls of the connecting shell and the pushing block.

[0013] Preferably, it also includes: Two elastic rubber pads are respectively fixedly connected to the inner walls of the two semi-annular clamping plates.

[0014] Preferably, it also includes: Two first sliding grooves, wherein the two first sliding grooves are symmetrically arranged on the inner side wall of the connecting shell; Two second sliding bars are respectively fixedly connected in two second sliding grooves, and two ends of the U-shaped pressing plate are slidably connected to the surfaces of the second sliding bars.

[0015] Preferably, it also includes: Four second sliding grooves, wherein the four second sliding grooves are respectively opened on the inner side wall of the connecting shell corresponding to the positions of the first driving plate; A sliding block, one end of which is fixedly connected to the side wall of the first driving plate, and the other end of which is slidably connected in the second sliding groove.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention provides a clamping seat and a U-shaped pressure plate, and actively feeds the wire into and out of the connection shell through the clamping seat, thereby reducing the difficulty of connecting and disassembling the wire. At the same time, the clamping seat clamps and limits the wire, thereby improving the stability of the wire during the connection process, thereby improving the stability of the test.

[0017] 2. The present invention sets a push block and a first drive plate. When it is necessary to connect the wire to the connection shell, the two push blocks are first pressed to make the two clamping seats move to the right. After the wire is placed on the two clamping seats, the two push blocks are released. The two push blocks are reset under the action of the elastic connecting piece, so that the L-shaped push rod pulls the two clamping seats to reset, so that the clamping seat actively transports the wire to the inside of the connection shell, which is beneficial to reduce the difficulty of connecting and disassembling the wire.

[0018] 3. The present invention provides a semi-annular clamping plate. When the two clamping seats drive the wire to move into the connecting shell, the two semi-annular clamping plates pull the wire to move to the left through the third pushing component, thereby further improving the limiting of the wire and improving the stability of the wire during connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the connection between the wire and the connection shell in the present invention; Figure 3 A cross-sectional view of the connecting shell in the present invention Figure 1 ; Figure 4 for Figure 3 Enlarged view of point A in the middle; Figure 5 for Figure 3 Enlarged view of point B in the middle; Figure 6 A cross-sectional view of the connecting shell in the present invention Figure 2 ; Figure 7 It is a schematic diagram of the connection between the clamping seat and the first driving plate in the present invention; Figure 8 It is a schematic diagram of the connection between the clamping seat and the semi-annular clamping plate in the present invention; Fig. 9 It is a schematic diagram of the connection between the U-shaped pressing plate and the second driving plate in the present invention.

[0020] In the figure: power wire 1, wire 2, wire 3, housing 4, connecting shell 5, terminal block 6, clamping seat 7, slot 8, guide slot 9, first straight slot 901, first inclined slot 902, first connecting pin 10, U-shaped pressure plate 11, first slide slot 12, second slide bar 13, first drive plate 14, second slide slot 15, sliding block 16, first drive slot 17, second straight slot 1701, second inclined slot 1702, L-shaped push rod 18, push block 19, first slide bar 20, return spring 21, second connecting pin 22, second drive plate 23, second drive slot 24, third inclined slot 2401, third straight slot 2402, third connecting pin 25, semi-annular clamping plate 26, elastic rubber pad 27, rack 28, rotating seat 29, gear 30, flip block 31, torsion spring 32, L-shaped push plate 33. DETAILED DESCRIPTION

[0021] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0022] like Figures 1 to 9 The EMI test device for an electric power supply shown in the figure comprises a housing 4, and an outer wall array of the housing 4 is provided with three connecting mechanisms, which are used to connect the neutral wire, the ground wire and the live wire of the power supply wire 1, and the connecting mechanisms include: A connecting shell 5, the connecting shell 5 is fixedly connected to the outer wall of the casing 4, and a wiring board 6 is fixedly connected to the inner bottom wall of the connecting shell 5; Two clamping seats 7, two clamping seats are symmetrically slidably connected to the inner wall of the connecting shell 5, and the side wall of the connecting seat is provided with a clamping groove 8; Four guide grooves 9, which are symmetrically arranged on the upper and lower sides of the housing 4, and have a first straight groove 901 and a first inclined groove 902; A first connecting pin 10, one end of which is fixedly connected to the outer wall of the clamping seat 7, and the other end of which is slidably connected to the guide groove 9 at the corresponding position; A first pushing assembly, the first pushing assembly is used to push the two clamping seats 7 to move left and right; The first push assembly includes: Four first driving plates 14, the four first driving plates 14 are symmetrically slidably connected to the inner side walls of the connecting shell 5; A first driving groove 17, which is provided on the first driving plate 14, and has a second straight groove 1701 and a second inclined groove 1702; Four L-shaped push rods 18, one end of the four L-shaped push rods 18 is fixedly connected to the first drive plate 14, and the other end is slidably connected to the end side wall of the clamping seat 7; Two push blocks 19, the two push blocks 19 symmetrically penetrate the inner wall of the connecting shell 5, the push blocks 19 are slidably connected to the connecting shell 5, an elastic connecting piece is provided between the push blocks 19 and the connecting shell 5, and the side walls of the push blocks 19 are symmetrically fixedly connected with second connecting pins 22, and the second connecting pins 22 are slidably connected to the first driving groove 17; A U-shaped pressing plate 11, which is slidably connected to the inner wall of the connecting shell 5 at a position corresponding to the terminal block 6; A second pushing component, the second pushing component is used to push the U-shaped pressing plate 11 to move up and down; The second push component includes: Two second driving plates 23, the two second driving plates 23 are symmetrically fixedly connected to the two ends of the U-shaped pressing plate 11; A second driving groove 24, which is provided on the second driving plate 23, and has a third inclined groove 2401 and a third straight groove 2402; Two third connecting pins 25, one end of the two third connecting pins 25 is fixedly connected to the push block 19, and the other end is slidably connected in the second driving groove 24; Specifically, in the prior art, during the EMI test of electronic equipment, it is necessary to connect the neutral wire, ground wire and live wire of the power line of the electronic equipment to the artificial power network. During the connection process, the electric wire 3 needs to be fixed to the artificial power network by bolts, and the bolts are removed after the test. The operation is cumbersome, and it is difficult to ensure the stability of the connection of the electric wire 3. It is easy to be affected by external forces and may fall off. The technical solution can solve the above problems. The specific operation is as follows: when it is necessary to test the power supply of the electronic equipment, first peel off the outer skin of the power wire 1 of the electronic equipment to expose the three wires 2 of the neutral wire, the ground wire and the live wire, and then insert the neutral wire, the ground wire and the live wire into the connection shell 5 at the corresponding position in turn; In the process of inserting the wire 2 into the connection shell 5, the U-shaped pressing plate 11 is first driven upward by the second pushing component to make way for the terminal block 6, and then the two clamping seats 7 are driven to move rightward along the track of the guide groove 9 by the first pushing component, close to the end of the connection shell 5. In the process of moving, the first connecting pin 10 first drives the clamping seat 7 to move linearly along the first straight groove 901, and then the first connecting pin 10 moves into the first inclined groove 902. Driven by the first inclined groove 902, the two clamping seats 7 are moved away from each other to expand the space of the card slot 8, and the wire 2 is placed in the card slot 8; After the wire 2 is placed in the clamping slot 8, the two clamping seats 7 are moved to the left along the track of the guide slot 9 through the first pushing assembly. Under the same operation as above, the two clamping seats 7 first approach each other to clamp the wire 2, and then the two clamping seats 7 actively transport the wire 2 to the inside of the connecting shell 5, so that the wire 3 of the wire 2 moves to the top of the terminal block 6; Then, the U-shaped pressing plate 11 is pushed downward by the second pushing component to press the electric wire 3 to make it contact with the terminal block 6 to complete the connection. After the three wires 2 are connected, the power supply of the electronic device is tested. At this time, the wire 2 is clamped by the clamping seat 7, which is conducive to improving the stability of the connection of the wire 2. After the test is finished, the same operation as above is performed to first move the U-shaped pressing plate 11 upward to cancel the pressing on the electric wire 3, and then the two clamping seats 7 actively drive the wire 2 to withdraw from the connecting shell 5, thereby reducing the difficulty of disassembly.

[0023] Specifically, by providing the push block 19 and the first drive plate 14, when the wire 2 needs to be connected to the connection shell 5, the two push blocks 19 are first pressed to move the two push blocks 19 into the connection shell 5. During the movement, the second connection pin 22 moves along the first drive groove 17. Driven by the second inclined groove 1702, the L-shaped push rod 18 pushes the clamping seat 7 to move to the right, and the two clamping seats 7 are moved away from each other according to the above groove. After placing the wire 2 on the two clamping seats 7, the two push blocks 19 are released, and the two push blocks 19 are reset under the action of the elastic connecting piece, so that the L-shaped push rod 18 pulls the two clamping seats 7 to reset, so that the clamping seat 7 actively transports the wire 2 to the inside of the connecting shell 5, which is helpful to avoid the problem of bending of the wire 2 when inserting the wire 2.

[0024] In the specific implementation process, the elastic connector includes: Two first sliding bars 20, the two first sliding bars 20 are symmetrically fixedly connected to the outer side wall of the connecting shell 5, and the pushing block 19 is slidably connected to the two first sliding bars 20; Two return springs 21, the two return springs 21 are respectively sleeved on the surfaces of the two first slide bars 20, and the two ends of the two return springs 21 are respectively fixedly connected to the side walls of the connecting shell 5 and the pushing block 19; Specifically, by providing the return spring 21 , the return spring 21 is compressed during the process of pressing the push block 19 , and after the push block 19 is released, the push block 19 is reset under the action of the return spring 21 .

[0025] Specifically, by setting the second driving plate 23, in the process of pressing the push block 19, the third connecting pin 25 first moves along the third inclined slot 2401, and under the drive of the third inclined slot 2401, the U-shaped pressing plate 11 moves upward to release the electric wire 3, so that the clamping seat 7 can drive the wire 2 to leave the connecting shell 5. In the process of the third connecting pin 25 moving along the third inclined slot 2401, the second connecting pin 22 moves along the second straight slot 1701; When the third connecting pin 25 enters the third straight groove 2402, the second connecting pin 22 moves along the second inclined groove 1702. According to the above operation, the clamping seat 7 moves to the right.

[0026] The specific implementation process also includes: Four second slide grooves 15, which are respectively opened on the inner side wall of the connecting shell 5 corresponding to the positions of the first driving plate 14; A sliding block 16, one end of which is fixedly connected to the side wall of the first driving plate 14, and the other end of which is slidably connected to the second sliding groove 15; Specifically, the second sliding groove 15 and the sliding block 16 are provided to allow the first driving plate 14 to move linearly along the second sliding groove 15 .

[0027] The specific implementation process also includes: Two first slide grooves 12, the two first slide grooves 12 are symmetrically arranged on the inner side wall of the connecting shell 5; Two second slide bars 13, the two second slide bars 13 are respectively fixedly connected in the two second slide grooves 15, and both ends of the U-shaped pressing plate 11 are slidably connected to the surfaces of the second slide bars 13; The first sliding groove 12 and the second sliding rod 13 are provided so that the U-shaped pressing plate 11 can move up and down along the surface of the second sliding rod 13 .

[0028] As a further embodiment of the present invention, it also includes: Two semi-annular clamping plates 26, the two semi-annular clamping plates 26 are respectively slidably connected to the ends of the clamping seat 7 at corresponding positions; A third pushing assembly, the third pushing assembly is used to push the two semi-annular clamping plates 26 so that the two semi-annular clamping plates 26 move left and right along the clamping seat 7; Specifically, by setting a semi-annular clamping plate, when the two clamping seats 7 drive the wire 2 to move into the connecting shell 5, the two semi-annular clamping plates 26 pull the wire 2 to move to the left through the third pushing component, further improving the limiting of the wire 2 and improving the stability of the wire 2 when connected.

[0029] As a further embodiment of the present invention, the third pushing component includes: Two racks 28, the two racks 28 are respectively fixedly connected to the two semi-annular clamping side walls; Two rotating seats 29, the two rotating seats 29 are respectively fixedly connected to the ends of the two clamping seats 7; Two gears 30, the two gears 30 are rotatably connected to the two rotating seats 29 respectively, and the gears 30 are meshed with the racks 28 at corresponding positions; A rotary drive mechanism, which is used to drive the gear 30 to rotate so that the semi-annular clamp at the corresponding position moves along the clamping seat 7 to pull the wire 2; Specifically, by providing a rack 28 and a gear 30, when the connecting seat drives the wire 2 to move into the connecting shell 5, the gear 30 is rotated by the rotating drive mechanism, and under the action of meshing, the semi-annular clamping plate 26 moves to the left to drive the wire 2 to be tightened into the clamping seat 7, thereby improving the stability of the wire 2 when connected.

[0030] As a further embodiment of the present invention, the rotary drive mechanism comprises: Two flip blocks 31, the two flip blocks 31 are coaxially fixed with the gears 30 at corresponding positions; Two torsion springs 32, one end of each torsion spring 32 is fixedly connected to the flip block 31 at the corresponding position, and the other end is fixedly connected to the rotating seat 29 at the corresponding position; Two L-shaped push plates 33, the two L-shaped push plates 33 are symmetrically fixedly connected to the inner wall of the connecting shell 5, and one end side wall of the L-shaped push plate 33 is in contact with the flip block 31; Specifically, by setting an L-shaped pushing plate 33, in the process of the two clamping seats 7 driving the wire 2 to move to the left, the flip block 31 passes through the L-shaped pushing plate 33, causing the flip block 31 to flip, the torsion spring 32 is compressed, and the flipping rotation drives the gear 30 to rotate. Under the action of meshing, the semi-annular clamping plate 26 moves to the left to drive the wire 2 to be tightened into the clamping seat 7. In the process of the two clamping seats 7 driving the wire 2 to move to the right, the flip block 31 cancels the contact with the L-shaped pushing plate 33. Under the action of the torsion spring 32, the flip plate flips and resets, and the gear 30 rotates, causing the semi-annular clamping plate 26 to move to the right to pull the wire 2 to the right for relaxation.

[0031] As a further embodiment of the present invention, it also includes: Two elastic rubber pads 27, the two elastic rubber pads 27 are respectively fixedly connected to the inner walls of the two semi-annular clamping plates 26; Specifically, two elastic rubber pads 27 are provided to increase the clamping force of the two semi-annular clamping plates 26 on the wire 2 , thereby increasing the stability of the wire 2 .

[0032] Working principle of the present invention: when the power supply of an electronic device needs to be tested, first peel off the outer skin of the power supply wire 1 of the electronic device to expose the three wires 2 of the neutral wire, the ground wire and the live wire, and then insert the neutral wire, the ground wire and the live wire into the connection shell 5 at the corresponding position in sequence; In the process of inserting the wire 2 into the connection shell 5, the U-shaped pressing plate 11 is first driven upward by the second pushing component to make way for the terminal block 6, and then the two clamping seats 7 are driven to move rightward along the track of the guide groove 9 by the first pushing component, close to the end of the connection shell 5. In the process of moving, the first connecting pin 10 first drives the clamping seat 7 to move linearly along the first straight groove 901, and then the first connecting pin 10 moves into the first inclined groove 902. Driven by the first inclined groove 902, the two clamping seats 7 are moved away from each other to expand the space of the card slot 8, and the wire 2 is placed in the card slot 8; After the wire 2 is placed in the clamping slot 8, the two clamping seats 7 are moved to the left along the track of the guide slot 9 through the first pushing assembly. Under the same operation as above, the two clamping seats 7 first approach each other to clamp the wire 2, and then the two clamping seats 7 actively transport the wire 2 to the inside of the connecting shell 5, so that the wire 3 of the wire 2 moves to the top of the terminal block 6; Then, the U-shaped pressing plate 11 is pushed downward by the second pushing component to press the electric wire 3 to make it contact with the terminal block 6 to complete the connection. After the three wires 2 are connected, the power supply of the electronic device is tested. At this time, the wire 2 is clamped by the clamping seat 7, which is conducive to improving the stability of the connection of the wire 2. After the test is finished, the same operation as above is performed to first move the U-shaped pressing plate 11 upward to cancel the pressing on the electric wire 3, and then the two clamping seats 7 actively drive the wire 2 to withdraw from the connecting shell 5, thereby reducing the difficulty of disassembly.

[0033] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. An EMI test device for an electric power supply, comprising a housing (4), wherein an outer wall array of the housing (4) is provided with three connection mechanisms, wherein the connection mechanisms are used to connect a neutral wire, a ground wire, and a live wire of a power supply wire (1), wherein: The connecting mechanism comprises: A connecting shell (5), the connecting shell (5) being fixedly connected to the outer wall of the housing (4), and a wiring board (6) being fixedly connected to the inner bottom wall of the connecting shell (5); Two clamping seats (7), the two clamping seats are symmetrically slidably connected to the inner wall of the connecting shell (5), and the side walls of the connecting seats are provided with a clamping groove (8); Four guide grooves (9), the four guide grooves (9) being symmetrically arranged on the upper and lower sides of the housing (4), and the guide grooves (9) having a first straight groove (901) and a first inclined groove (902); A first connecting pin (10), one end of the first connecting pin (10) being fixedly connected to the outer side wall of the clamping seat (7), and the other end of the first connecting pin (10) being slidably connected to a guide groove (9) at a corresponding position; A first pushing component, the first pushing component is used to push the two clamping seats (7) to move left and right; A U-shaped pressing plate (11), the U-shaped pressing plate (11) being slidably connected to the inner wall of the connecting shell (5) at a position corresponding to the terminal block (6); A second pushing component, the second pushing component is used to push the U-shaped pressing plate (11) to move up and down.

2. The EMI test device for electric power supply according to claim 1, characterized in that: The first pushing component comprises: Four first drive plates (14), the four first drive plates (14) being symmetrically slidably connected to the inner side wall of the connection shell (5); A first driving groove (17), the first driving groove (17) being formed on the first driving plate (14), the first driving groove (17) comprising a second straight groove (1701) and a second inclined groove (1702); Four L-shaped push rods (18), one end of the four L-shaped push rods (18) is fixedly connected to the first drive plate (14), and the other end is slidably connected to the end side wall of the clamping seat (7); Two push blocks (19), the two push blocks (19) symmetrically penetrate the inner wall of the connecting shell (5), the push blocks (19) are slidably connected to the connecting shell (5), an elastic connecting piece is provided between the push blocks (19) and the connecting shell (5), and a second connecting pin (22) is symmetrically fixedly connected to the side wall of the push block (19), and the second connecting pin (22) is slidably connected to the first driving groove (17).

3. The EMI test device for electric power supply according to claim 2, characterized in that: The second pushing component comprises: Two second drive plates (23), the two second drive plates (23) being symmetrically fixedly connected to two ends of the U-shaped pressing plate (11); A second driving groove (24), the second driving groove (24) being formed on the second driving plate (23), the second driving groove (24) having a third inclined groove (2401) and a third straight groove (2402); Two third connecting pins (25), one end of the two third connecting pins (25) is fixedly connected to the push block (19), and the other end is slidably connected in the second driving groove (24).

4. The EMI test device for electric power supply according to claim 1, characterized in that: Also includes: Two semi-annular clamping plates (26), the two semi-annular clamping plates (26) being respectively slidably connected to the ends of the clamping seat (7) at corresponding positions; A third pushing assembly, the third pushing assembly being used to push the two semi-annular clamping plates (26) so that the two semi-annular clamping plates (26) move left and right along the clamping seat (7).

5. The EMI test device for electric power supply according to claim 4, characterized in that: The third pushing component comprises: Two racks (28), the two racks (28) being respectively fixedly connected to two semi-annular clamping side walls; Two rotating seats (29), the two rotating seats (29) being fixedly connected to the ends of the two clamping seats (7) respectively; Two gears (30), the two gears (30) being rotatably connected to two rotating seats (29) respectively, and the gears (30) being meshed with racks (28) at corresponding positions; A rotary drive mechanism, the rotary drive mechanism is used to drive the gear (30) to rotate, so that the semi-annular clamp at the corresponding position moves along the clamp seat (7) to pull the power cord (1).

6. The EMI test device for electric power supply according to claim 5, characterized in that: The rotary drive mechanism comprises: Two flip blocks (31), the two flip blocks (31) being coaxially fixed to the gears (30) at corresponding positions; Two torsion springs (32), one end of each of the two torsion springs (32) being fixedly connected to the flip blocks (31) at corresponding positions, and the other end of each of the two torsion springs (32) being fixedly connected to the rotating seats (29) at corresponding positions; Two L-shaped push plates (33), the two L-shaped push plates (33) are symmetrically fixedly connected to the inner wall of the connecting shell (5), and one end side wall of the L-shaped push plate (33) is in contact with the flip block (31).

7. The EMI test device for electric power supply according to claim 2, characterized in that: The elastic connecting member comprises: Two first sliding rods (20), the two first sliding rods (20) are symmetrically fixedly connected to the outer side wall of the connecting shell (5), and the pushing block (19) is slidably connected to the two first sliding rods (20); Two return springs (21) are respectively sleeved on the surfaces of the two first slide bars (20), and two ends of the two return springs (21) are respectively fixedly connected to the side walls of the connecting shell (5) and the pushing block (19).

8. The EMI test device for electric power supply according to claim 4, characterized in that: Also includes: Two elastic rubber pads (27), the two elastic rubber pads (27) are respectively fixedly connected to the inner walls of the two semi-annular clamping plates (26).

9. The EMI test device for electric power supply according to claim 1, characterized in that: Also includes: Two first sliding grooves (12), the two first sliding grooves (12) being symmetrically arranged on the inner side wall of the connecting shell (5); Two second sliding rods (13), the two second sliding rods (13) are respectively fixedly connected in two second sliding grooves (15), and the two ends of the U-shaped pressing plate (11) are slidably connected to the surface of the second sliding rod (13).

10. The EMI test device for electric power supply according to claim 2, characterized in that: Also includes: Four second sliding grooves (15), the four second sliding grooves (15) being respectively arranged on the inner side wall of the connecting shell (5) corresponding to the positions of the first driving plate (14); A sliding block (16), one end of the sliding block (16) is fixedly connected to the side wall of the first driving plate (14), and the other end of the sliding block (16) is slidably connected in the second sliding groove (15).

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