Diode polarity testing device

Abstract

The invention relates to the technical field of testing devices, and discloses a diode polarity testing device which comprises a base, a vertical plate is fixedly installed on the upper surface of one side of the base, two T-shaped sliding grooves are symmetrically formed in the upper surface of one side of the vertical plate, and T-shaped sliding blocks are slidably installed on the inner walls of the two T-shaped sliding grooves. The crankshaft rotates to drive the two groups of cross conducting rods to move downwards and upwards, the crankshaft drives the insulating disc to rotate, the insulating disc drives the conducting tube to rotate, positive and negative electrodes of the measuring multimeter are in positive and negative electrode connection with diode pins, and the quality of a diode can be visually judged through information displayed by the measuring multimeter. During batch testing, the positive and negative pins of the diode do not need to be manually aligned, the detection efficiency is greatly improved, and meanwhile, two data results can be tested by performing forward and reverse electrode connection on the diode, so that the test data is more accurate.

Description

Technical Field

[0001] The invention relates to the technical field of testing devices, and in particular to a diode polarity testing device. Background Art

[0002] Diode, a device with two electrodes in electronic components, only allows current to flow in one direction. Many uses are for its rectification function. Varactor diodes are used as electronic adjustable capacitors. The current directionality of most diodes is usually called the "rectification" function. The most common function of a diode is to only allow current to flow in one direction and block it in the reverse direction.

[0003] An existing diode installation polarity test tool (Announcement No.: CN215894832U) has at least the following disadvantages: When the above patent is in use, a second electric push rod is set. When the pin of the diode enters the interior of the test slot, the conductive block is pushed close to the pin of the diode through the telescopic shaft of the second electric push rod. When the positive and negative poles of the diode are detected correctly, the prompt light emits a green light effect to indicate that the positive and negative poles of the diode are correct, and when the prompt light emits a red light effect, it indicates that the positive and negative poles are wrong. When testing, the above patent needs to manually align the positive and negative poles of the diode with the corresponding test ends before the diode polarity can be correctly tested. Manually aligning the positive and negative poles of the diode is slow, which will greatly reduce the detection efficiency when testing the polarity of diodes in batches. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings in the prior art and to propose a diode polarity testing device.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: The cam is provided with a plurality of T-shaped sliding grooves, and the inner walls of the two T-shaped sliding grooves are slidably mounted with T-shaped sliding blocks. The outer surface of one side of the T-shaped sliding groove is fixedly mounted with a mounting plate, and the outer surface of the mounting plate away from the side of the vertical plate is provided with two mounting blocks symmetrically fixedly mounted up and down. The outer surfaces of the two adjacent sides of the two mounting blocks are provided with a cross sliding groove, and the inner walls of the cross sliding groove are slidably mounted with a cross conductive rod. The outer surface of the other side of the vertical plate has two first support blocks symmetrically fixedly mounted up and down, and the outer surfaces of the two first support blocks are penetrated with sliding openings, and a driving rod is slidably mounted between the inner walls of the sliding openings, and the bottom and top ends of the driving rod are fixedly mounted with a cross bar, and the end of the cross bar close to the mounting block is fixedly mounted with a square sliding sleeve, and the inner walls of the opposite ends of the square sliding sleeve are slidably mounted with L-shaped square sliding rods, and the bottom end of the L-shaped square sliding rod passes through the inner wall of the cross sliding groove and is fixedly mounted on the outer surface of the cross conductive rod.

[0006] As a further solution of the present invention, a shell is fixedly installed on the outer surface of the other side of the vertical plate, a driving motor is fixedly installed on the outer surface of the shell away from the vertical plate, a crankshaft is rotatably installed between the shell and the vertical plate, the output end of the driving motor passes through the outer surface of the shell and is fixedly installed on the rotation center of the crankshaft, a crank neck is provided on the outer surface of the crankshaft, a guide groove is penetrated through the outer surface of the middle position of the driving rod, and the crankshaft is slidably installed on the inner wall of the guide groove.

[0007] As a further solution of the present invention, an insulating disk is fixedly installed on the outer surface of the vertical plate at one end of the crankshaft away from the driving motor, and two recessed grooves are symmetrically provided on the outer surfaces of the insulating disk on opposite sides, and a conductive tube is fixedly installed on the inner walls of the two recessed grooves, and the conductive tube is V-shaped, and the corner position of the conductive tube is located at the same center of the circle as the insulating disk, and the interior of the conductive tube is hollow, and conductive sliders are slidably installed on the inner walls of the conductive tube near both ends, and a conductive rod is fixedly installed on the outer surface of one side of the conductive slider, and a tension spring is sleeved on the outer surface of the conductive rod near one end, one end of the tension spring is fixedly connected to the outer surface of the conductive slider, and the other end of the tension spring is fixedly connected to the inner wall of one end of the conductive tube.

[0008] As a further solution of the present invention, an insulating ring is fixedly installed on the outer surface of the vertical plate close to the insulating disk, the insulating disk and the insulating ring are arranged at the same center of a circle, two groups of first electrode blocks are symmetrically fixedly installed on the circumferential outer surface of the insulating ring in groups of two, and two groups of second electrode blocks are also symmetrically fixedly installed on the circumferential outer surface of the insulating ring in groups of two. Two annular grooves are provided on the circumferential outer surface of the insulating ring, and connecting wires are fixedly installed on the inner walls of the two annular grooves, and the two first electrode blocks on adjacent sides are electrically connected by the connecting wires.

[0009] As a further solution of the present invention, the first electrode block and the second electrode block do not contact each other, and one end of the first electrode block and the second electrode block located outside the insulating ring is provided with a terminal, and the other ends of the first electrode block and the second electrode block pass through the inner wall of the insulating ring and are flush with the inner wall of the insulating ring, and the other end of the conductive rod passes through the end face of the conductive tube and abuts against the inner wall of the insulating ring.

[0010] As a further solution of the present invention, a measuring multimeter is fixedly installed on the top of the vertical plate, and the positive and negative poles of the measuring multimeter are electrically connected to the terminals at the ends of the two first electrode blocks through wires, and the outer surface of the L-shaped square sliding rod is provided with electrode connecting columns. The electrode connecting columns on the outer surfaces of the upper two L-shaped square sliding rods are electrically connected to the terminals at the ends of one group of two second electrode blocks through wires, and the electrode connecting columns on the outer surfaces of the lower two L-shaped square sliding rods are electrically connected to the terminals at the ends of the other group of two second electrode blocks through wires.

[0011] As a further solution of the present invention, two second support blocks are symmetrically fixedly installed on the outer surface of the vertical plate close to the two T-shaped slide grooves, and a bidirectional screw rod is rotatably installed between the two second support blocks. The bidirectional screw rod passes through the outer surfaces of the two T-shaped slide blocks and is threadedly connected to them. One end of the bidirectional screw rod passes through the outer surface of the second support block and is fixedly installed with a knob.

[0012] As a further solution of the present invention, the V-shaped angle of the conductive tube is 120°, and the obtuse angle between the center lines of the two groups of the first electrode blocks and the center lines of the two groups of the second electrode blocks is 120°.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The crankshaft rotates to drive two groups of cross conductive rods to move downward and upward, and the crankshaft drives the insulating disk to rotate, and the insulating disk drives the conductive tube to rotate, so that the positive and negative poles of the multimeter are connected to the diode pins in the positive and negative directions. The quality of the diode can be intuitively judged by measuring the information displayed by the multimeter. In batch testing, there is no need to manually align the positive and negative pins of the diode, which greatly improves the efficiency of detection. At the same time, by connecting the diodes in the positive and negative directions, two data results can be tested, making the test data more accurate; 2. By manually turning the knob, the knob drives the bidirectional lead screw to rotate, and the bidirectional lead screw drives the two T-shaped sliders to move closer to or away from each other. The two T-shaped sliders drive the two sets of mounting blocks to move closer to or away from each other through the mounting plate. This device can be adjusted according to the different pin distances of the diode model, thereby improving the applicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the overall structure of a diode polarity testing device proposed by the present invention; Figure 2 A rear view structural schematic diagram of a diode polarity testing device proposed by the present invention; Figure 3 A schematic diagram of a driving rod of a diode polarity testing device proposed by the present invention; Figure 4A schematic diagram of the top view of a diode polarity testing device proposed by the present invention; Figure 5 A schematic diagram of an installation block of a diode polarity testing device proposed by the present invention; Figure 6 A schematic diagram of a crankshaft of a diode polarity testing device proposed by the present invention; Figure 7 A schematic diagram of an insulating disk of a diode polarity testing device proposed by the present invention; Figure 8 A schematic diagram of an insulating ring of a diode polarity testing device proposed by the present invention; Fig. 9 A schematic diagram of a first electrode block of a diode polarity testing device proposed by the present invention; Fig.10 A schematic diagram of a second electrode block of a diode polarity testing device proposed by the present invention; Fig.11 A schematic diagram of a conductive tube of a diode polarity testing device proposed by the present invention.

[0015] In the figure: 1, base; 2, vertical plate; 3, measuring multimeter; 4, housing; 5, driving motor; 6, second electrode block; 7, mounting plate; 8, mounting block; 9, T-shaped slider; 10, bidirectional screw rod; 11, knob; 12, cross conductive rod; 13, cross slide groove; 14, L-shaped square slide rod; 1401, electrode connecting column; 15, T-shaped slide groove; 16, square sleeve; 17, driving rod; 18, wire; 19, first support block; 20, second support block; 21, crankshaft; 22, guide groove; 23, connecting wire; 24, insulating ring; 2401, ring groove; 25, insulating disk; 26, conductive tube; 2601, conductive slider; 2602, conductive rod; 2603, tension spring; 27, first electrode block. DETAILED DESCRIPTION

[0016] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0017] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0018] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] Reference Figure 1-Figure 11 A diode polarity test device comprises a base 1, a vertical plate 2 is fixedly installed on the upper surface of one side of the base 1, two T-shaped slide grooves 15 are symmetrically arranged on the upper surface of one side of the vertical plate 2, and T-shaped sliders 9 are slidably installed on the inner walls of the two T-shaped slide grooves 15, a mounting plate 7 is fixedly installed on the outer surface of one side of the T-shaped slider 9, and two mounting blocks 8 are symmetrically fixedly installed on the outer surface of the mounting plate 7 away from the vertical plate 2, and a cross slide groove 13 is arranged on the outer surface of the adjacent side of the two mounting blocks 8, and a cross conductive rod is slidably installed on the inner wall of the cross slide groove 13 12, two first support blocks 19 are symmetrically fixedly installed on the outer surface of the other side of the vertical plate 2, and the outer surfaces of the two first support blocks 19 are penetrated with sliding openings, and a driving rod 17 is slidably installed between the inner walls of the sliding openings, and a cross bar is fixedly installed on the bottom and top of the driving rod 17, and a square sliding sleeve 16 is fixedly installed on one end of the cross bar close to the mounting block 8, and L-shaped square sliding rods 14 are slidably installed on the inner walls of the opposite ends of the square sliding sleeve 16, and the bottom end of the L-shaped square sliding rod 14 passes through the inner wall of the cross sliding groove 13 and is fixedly installed on the outer surface of the cross conductive rod 12.

[0020] The crankshaft 21 drives the driving rod 17 to reciprocate up and down through the crank neck and the guide groove 22. The driving rod 17 drives the square sliding sleeve 16 to reciprocate up and down through the cross bar. The square sliding sleeve 16 drives the two groups of cross conductive rods 12 to move downward and upward through the L-shaped square sliding rod 14. When the two upper cross conductive rods 12 move downward, the pins of the diode will be pressed on the upper surfaces of the two lower mounting blocks 8. When the two lower cross conductive rods 12 move upward, the pins of the diode will be pressed on the lower surfaces of the two upper mounting blocks 8.

[0021] In this embodiment, a shell 4 is fixedly installed on the outer surface of the other side of the vertical plate 2, and a driving motor 5 is fixedly installed on the outer surface of the shell 4 away from the vertical plate 2. A crankshaft 21 is rotatably installed between the shell 4 and the vertical plate 2. The output end of the driving motor 5 passes through the outer surface of the shell 4 and is fixedly installed with the rotation center of the crankshaft 21. The outer surface of the crankshaft 21 is provided with a curved neck, and a guide groove 22 is provided through the outer surface of the middle position of the driving rod 17. The crankshaft 21 is slidably installed with the inner wall of the guide groove 22. An insulating disk 25 is fixedly installed on the outer surface of the vertical plate 2 at one end of the crankshaft 21 away from the driving motor 5. Two sink grooves are symmetrically provided on the outer surfaces of the insulating disk 25 on opposite sides, and the inner walls of the two sink grooves are fixedly installed with conductive tubes 2 6. The conductive tube 26 is arranged in a V shape, the corner position of the conductive tube 26 and the insulating disk 25 are arranged at the same center of the circle, the interior of the conductive tube 26 is arranged hollow, the inner wall of the conductive tube 26 near both ends is slidably mounted with a conductive slider 2601, the outer surface of one side of the conductive slider 2601 is fixedly mounted with a conductive rod 2602, the outer surface of the conductive rod 2602 near one end is sleeved with a tension spring 2603, one end of the tension spring 2603 is fixedly connected to the outer surface of the conductive slider 2601, and the other end of the tension spring 2603 is fixedly connected to the inner wall of one end of the conductive tube 26, the outer surface of the vertical plate 2 near the insulating disk 25 is fixedly mounted with an insulating ring 24, and the insulating disk 25 and the insulating ring 24 are arranged at the same center of the circle, Two groups of first electrode blocks 27 are symmetrically fixedly installed in pairs on the circumferential outer surface of the insulating ring 24, and two groups of second electrode blocks 6 are also symmetrically fixedly installed in pairs on the circumferential outer surface of the insulating ring 24. Two annular grooves 2401 are provided on the circumferential outer surface of the insulating ring 24. The inner walls of the two annular grooves 2401 are fixedly installed with connecting wires 23. The two first electrode blocks 27 on the adjacent side are electrically connected by the connecting wires 23. The first electrode blocks 27 and the second electrode blocks 6 do not contact each other. The ends of the first electrode blocks 27 and the second electrode blocks 6 located outside the insulating ring 24 are both provided with terminal blocks, and the other ends of the first electrode blocks 27 and the second electrode blocks 6 pass through the inner wall of the insulating ring 24 and are connected to the inner wall of the insulating ring 24. The other end of the conductive rod 2602 passes through the end face of the conductive tube 26 and abuts against the inner wall of the insulating ring 24. A measuring multimeter 3 is fixedly installed on the top of the vertical plate 2. The positive and negative poles of the measuring multimeter 3 are electrically connected to the terminals at the ends of the two first electrode blocks 27 through the wires 18. The outer surface of the L-shaped square slide bar 14 is provided with electrode connecting posts 1401. The electrode connecting posts 1401 on the outer surfaces of the upper two L-shaped square slide bars 14 are electrically connected to the terminals at the ends of one group of two second electrode blocks 6 through the wires 18, and the electrode connecting posts 1401 on the outer surfaces of the lower two L-shaped square slide bars 14 are electrically connected to the terminals at the ends of the other group of two second electrode blocks 6 through the wires 18.

[0022] The driving motor 5 is controlled to rotate by the inching switch. The driving motor 5 rotates one circle once the inching is performed. The crankshaft 21 is driven to rotate by the driving motor 5. At the same time, when the two cross conductive rods 12 below are in contact with the diode pins, the insulating disk 25 is driven to rotate by the crankshaft 21, and the insulating disk 25 drives the conductive tube 26 to rotate. When the conductive tube 26 rotates 90 degrees, the two first electrode blocks 27 above are electrically connected with the two second electrode blocks 6 below through the conductive rod 2602, so that the positive and negative poles of the measuring multimeter 3 are connected with the positive and negative pins of the diode through the wire 18 and the cross conductive rod 12 respectively. When connected in the forward direction, the measuring multimeter 3 displays a certain voltage drop (usually 0.6V to 0.7V for silicon diodes). When the conductive tube 26 continues to rotate 1 When the angle is 80°, the two first electrode blocks 27 below are electrically connected to the two second electrode blocks 6 above through the conductive rod 2602, so that the positive and negative poles of the measuring multimeter 3 are connected to the negative and positive pins of the diode through the wire 18 and the cross conductive rod 12 respectively. When connected in reverse, the resistance should be displayed as infinite (indicating that the diode is in the cut-off state and current is not allowed to pass through). The device can be used to connect the electrodes of the diode in the forward and reverse directions. The quality of the diode can be intuitively judged by measuring the information displayed on the multimeter 3. During batch testing, there is no need to manually align the positive and negative pins of the diode, which greatly improves the efficiency of detection. At the same time, by connecting the electrodes of the diode in the forward and reverse directions, two data results can be tested, thereby making the test data more accurate.

[0023] In this embodiment, two second support blocks 20 are symmetrically fixedly installed on the outer surface of the vertical plate 2 near the two T-shaped slide grooves 15, and a bidirectional screw rod 10 is rotatably installed between the two second support blocks 20. The bidirectional screw rod 10 passes through the outer surfaces of the two T-shaped sliding blocks 9 and is threadedly connected to them. One end of the bidirectional screw rod 10 passes through the outer surface of the second support block 20 and is fixedly installed with a knob 11.

[0024] By manually rotating the knob 11, the knob 11 drives the bidirectional screw rod 10 to rotate, and the bidirectional screw rod 10 drives the two T-shaped sliders 9 to move closer to or away from each other. The two T-shaped sliders 9 drive the two groups of mounting blocks 8 to move closer to or away from each other through the mounting plate 7. The device can be adjusted according to the different pin distances of the diode model, thereby improving the applicability of the device.

[0025] In this embodiment, the V-shaped angle of the conductive tube 26 is 120°, and the obtuse angle between the center lines of the two groups of first electrode blocks 27 and the center lines of the two groups of second electrode blocks 6 is 120°. Through this setting, the conductive tube 26 can be correctly connected to the measuring multimeter 3 and the cross conductive rod 12.

[0026] In this embodiment, it should be noted that, in the initial position, the center line of the crank neck of the crankshaft 21 is arranged parallel to the center line of one section of the conductive tube 26; the two L-shaped square slide bars 14 located below and the two L-shaped square slide bars 14 located above are arranged opposite to the wiring method of the two groups of second electrode blocks 6.

[0027] It should be noted that when the present invention is in use, the user places the two pins of the diode to be tested between a group of two mounting blocks 8, controls the rotation of the drive motor 5 through the inching switch, and rotates the drive motor 5 once the inching switch is turned. The drive motor 5 drives the crankshaft 21 to rotate, and the crankshaft 21 drives the drive rod 17 to reciprocate up and down through the crank neck and the guide groove 22. The drive rod 17 drives the square sliding sleeve 16 to reciprocate up and down through the cross bar, and the square sliding sleeve 16 drives the two groups of cross conductive rods 12 to move downward and upward through the L-shaped square sliding rod 14. When When the two cross conductive rods 12 at the top move downward, the pins of the diode will be pressed against the upper surfaces of the two mounting blocks 8 at the bottom. When the two cross conductive rods 12 at the bottom move upward, the pins of the diode will be pressed against the lower surfaces of the two mounting blocks 8 at the top. At the same time, when the two cross conductive rods 12 at the bottom come into contact with the pins of the diode, the crankshaft 21 drives the insulating disk 25 to rotate, and the insulating disk 25 drives the conductive tube 26 to rotate. When the conductive tube 26 rotates 90°, the two first electrode blocks 27 at the top and the lower first electrode blocks 27 at the bottom are connected to each other through the conductive rod 2602. The two second electrode blocks 6 are electrically connected, so that the positive and negative electrodes of the measuring multimeter 3 are connected to the positive and negative pins of the diode through the wire 18 and the cross conductive rod 12 respectively. When connected in the forward direction, the measuring multimeter 3 displays a certain voltage drop (usually 0.6V to 0.7V for silicon diodes). When the conductive tube 26 continues to rotate 180°, the two first electrode blocks 27 below are electrically connected to the two second electrode blocks 6 above through the conductive rod 2602, so that the positive and negative electrodes of the measuring multimeter 3 are connected to the negative and positive pins of the diode through the wire 18 and the cross conductive rod 12 respectively. When connected in the reverse direction, the resistance should be displayed as infinite (indicating that the diode is in the cut-off state and current is not allowed to pass). The device can be used to connect the electrodes of the diode in the forward and reverse directions. The quality of the diode can be intuitively judged by measuring the information displayed by the multimeter 3. In batch testing, there is no need to manually align the positive and negative pins of the diode, which greatly improves the efficiency of detection. At the same time, by connecting the electrodes of the diode in the forward and reverse directions, two data results can be tested, thereby making the test data more accurate. By manually rotating the knob 11, the knob 11 drives the bidirectional screw rod 10 to rotate, and the bidirectional screw rod 10 drives the two T-shaped sliders 9 to move closer to or away from each other. The two T-shaped sliders 9 drive the two groups of mounting blocks 8 to move closer to or away from each other through the mounting plate 7. The device can be adjusted according to the different pin distances of the diode model, thereby improving the applicability of the device.

[0028] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A diode polarity test device, comprising a base (1), characterized in that: A vertical plate (2) is fixedly mounted on the upper surface of one side of the base (1), two T-shaped slide grooves (15) are symmetrically arranged on the upper surface of one side of the vertical plate (2), a T-shaped slider (9) is slidably mounted on the inner walls of the two T-shaped slide grooves (15), a mounting plate (7) is fixedly mounted on the outer surface of one side of the T-shaped slider (9), two mounting blocks (8) are symmetrically fixedly mounted on the outer surface of the mounting plate (7) away from the vertical plate (2), a cross slide groove (13) is arranged on the outer surface of the adjacent side of the two mounting blocks (8), a cross conductive rod (12) is slidably mounted on the inner wall of the cross slide groove (13), and the vertical plate (2) Two first support blocks (19) are symmetrically fixedly installed on the outer surface of the other side, and the outer surfaces of the two first support blocks (19) are penetrated with a sliding opening, and a driving rod (17) is slidably installed between the inner walls of the sliding opening. The bottom and top ends of the driving rod (17) are fixedly installed with a cross bar, and the end of the cross bar close to the mounting block (8) is fixedly installed with a square sliding sleeve (16), and the inner walls of the opposite ends of the square sliding sleeve (16) are slidably installed with L-shaped square sliding rods (14), and the bottom end of the L-shaped square sliding rod (14) passes through the inner wall of the cross sliding groove (13) and is fixedly installed on the outer surface of the cross conductive rod (12).

2. A diode polarity testing device according to claim 1, characterized in that: A housing (4) is fixedly mounted on the outer surface of the other side of the vertical plate (2); a driving motor (5) is fixedly mounted on the outer surface of the housing (4) away from the vertical plate (2); a crankshaft (21) is rotatably mounted between the housing (4) and the vertical plate (2); an output end of the driving motor (5) passes through the outer surface of the housing (4) and is fixedly mounted at the rotation center of the crankshaft (21); a crank neck is provided on the outer surface of the crankshaft (21); a guide groove (22) is provided through the outer surface of the middle position of the driving rod (17); and the crankshaft (21) is slidably mounted on the inner wall of the guide groove (22).

3. A diode polarity testing device according to claim 2, characterized in that: An insulating disk (25) is fixedly mounted on the outer surface of the vertical plate (2) at one end of the crankshaft (21) away from the drive motor (5). Two recesses are symmetrically formed on the outer surfaces of the insulating disk (25) on opposite sides. A conductive tube (26) is fixedly mounted on the inner walls of the two recesses. The conductive tube (26) is arranged in a V-shape. The corner position of the conductive tube (26) and the insulating disk (25) are arranged at the same center of a circle. The interior of the conductive tube (26) is hollow. Conductive sliders (2601) are slidably mounted on the inner walls of the conductive tube (26) near both ends. A conductive rod (2602) is fixedly mounted on the outer surface of one side of the conductive slider (2601). A tension spring (2603) is sleeved on the outer surface of the conductive rod (2602) near one end. One end of the tension spring (2603) is fixedly connected to the outer surface of the conductive slider (2601). The other end of the tension spring (2603) is fixedly connected to the inner wall of one end of the conductive tube (26).

4. A diode polarity testing device according to claim 3, characterized in that: An insulating ring (24) is fixedly mounted on the outer surface of the vertical plate (2) near the insulating disk (25); the insulating disk (25) and the insulating ring (24) are arranged at the same center of a circle; two groups of first electrode blocks (27) are symmetrically fixedly mounted in pairs on the circumferential outer surface of the insulating ring (24); two groups of second electrode blocks (6) are also symmetrically fixedly mounted in pairs on the circumferential outer surface of the insulating ring (24); two annular grooves (2401) are provided on the circumferential outer surface of the insulating ring (24); connecting wires (23) are fixedly mounted on the inner walls of the two annular grooves (2401); and two first electrode blocks (27) on adjacent sides are electrically connected via the connecting wires (23).

5. A diode polarity testing device according to claim 4, characterized in that: The first electrode block (27) and the second electrode block (6) do not contact each other; one end of the first electrode block (27) and the second electrode block (6) located outside the insulating ring (24) is provided with a terminal; the other ends of the first electrode block (27) and the second electrode block (6) penetrate the inner wall of the insulating ring (24) and are flush with the inner wall of the insulating ring (24); the other end of the conductive rod (2602) penetrates the end surface of the conductive tube (26) and abuts against the inner wall of the insulating ring (24).

6. A diode polarity testing device according to claim 5, characterized in that: A measuring multimeter (3) is fixedly mounted on the top of the vertical plate (2), and the positive and negative electrodes of the measuring multimeter (3) are electrically connected to the terminals at the ends of the two first electrode blocks (27) through wires (18), respectively. The outer surface of the L-shaped square slide bar (14) is provided with an electrode connecting column (1401), and the electrode connecting columns (1401) on the outer surfaces of the two upper L-shaped square slide bars (14) are electrically connected to the terminals at the ends of one group of two second electrode blocks (6) through wires (18), and the electrode connecting columns (1401) on the outer surfaces of the two lower L-shaped square slide bars (14) are electrically connected to the terminals at the ends of the other group of two second electrode blocks (6) through wires (18).

7. A diode polarity testing device according to claim 1, characterized in that: Two second support blocks (20) are symmetrically and fixedly mounted on the outer surface of the vertical plate (2) on one side close to the two T-shaped slide grooves (15); a bidirectional screw rod (10) is rotatably mounted between the two second support blocks (20); the bidirectional screw rod (10) passes through the outer surfaces of the two T-shaped slide blocks (9) and is threadedly connected thereto; one end of the bidirectional screw rod (10) passes through the outer surface of the second support block (20) and is fixedly mounted with a knob (11).

8. A diode polarity testing device according to claim 4, characterized in that: The V-shaped angle of the conductive tube (26) is 120°, and the obtuse angle between the center lines of the two groups of the first electrode blocks (27) and the center lines of the two groups of the second electrode blocks (6) is 120°.

Images