CN115394224B

CN115394224B - Circuit detection device of liquid crystal display module

Info

Publication number: CN115394224B
Application number: CN202211141833.0A
Authority: CN
Inventors: 罗武彬; 李卫强; 侯富英
Original assignee: Jiangxi Kehua Electronic Co ltd
Current assignee: Jiangxi Kehua Electronic Co ltd
Priority date: 2022-09-20
Filing date: 2022-09-20
Publication date: 2023-06-02
Anticipated expiration: 2042-09-20
Also published as: CN115394224A

Abstract

The invention discloses a circuit detection device of a liquid crystal display module, and particularly relates to the field of LED lamp strip detection. According to the invention, the LED detection pen is arranged, after the LED detection pen is fixed, the tension spring is compressed by pressing the movable pressing switch, so that the pen point of the detection pen is contacted with the anode and the cathode, the detection purpose is achieved, and the detection work can be completed by only one hand during detection, so that the time and the labor are saved, and the convenience is improved.

Description

Circuit detection device of liquid crystal display module

Technical Field

The invention relates to the technical field of LED lamp strip detection, in particular to a circuit detection device of a liquid crystal display module.

Background

The LCD is a display mode by controlling semiconductor LEDs, and is composed of tens of thousands to hundreds of thousands of semiconductor LEDs with pixel points uniformly arranged. The LED pixel points with different colors can be manufactured by using different materials so as to display various information display screens such as characters, graphics, images, animation, quotations, videos, video signals and the like, the most widely used at present is red, green and yellow, the liquid crystal display screen is divided into an image-text display screen and a video display screen, each image-text display screen is composed of LED matrix blocks, the image-text display screen can synchronously display Chinese characters, english texts and graphics with a computer, the video display screen is controlled by a microcomputer, the image-text display screen and the image-text display screen are combined, various information can be played in a real-time, synchronous and clear information transmission mode, and the LED pixel points can also display two-dimensional, three-dimensional animation, video, television, VCD programs and field live scenes.

In the mill, unqualified LED lamp area needs to use the LED detector to detect in the LCD screen, carry out the secondary screening, thereby confirm whether damage, it is usually that the staff both hands hold the LED and detect the positive and negative pole that the LED detected the pen and aim at the LED lamp area, because the reason that both hands held, be difficult to fix the LED lamp area, thereby inconvenient operation, therefore the time consuming and labor consuming that is compared, and under the large batch operation of mill assembly line, the staff easily appears tiredly, if the LED detects the pen drops, the LED that switch on the power detects pen and the contact of people very easily takes place danger, consequently, how to design a circuit detection device of LCD module to this problem, become our current problem that needs to be solved.

Disclosure of Invention

In order to overcome the above-mentioned defect of the prior art, the embodiment of the invention provides a circuit detection device of a liquid crystal display module, through setting up the LED detection pen, press the movable push switch, make the support limit stop slide to the first U-shaped limit stop slot when locating, first U-shaped limit stop slot is spacing to support limit stop, simultaneously, movable clamp plate is fixed to the LED lamp area first, reset spring shortens, drive movable clamp plate retract the inner chamber of movable limit cylinder, thereby make the detection pen nib contact with positive and negative pole, achieve the purpose of continuous detection, after detecting, press the movable push switch again, make the support limit stop slide to the right inboard of the spacing spout of diamond, utilize the reaction force of extension spring, make the support limit stop slide to the second U-shaped limit stop slot to stay fixedly fast, make the whole rising of LED detection pen reset, in order to solve the problem that the above-mentioned background art presented.

In order to achieve the above purpose, the present invention provides the following technical solutions: the circuit detection device of the liquid crystal display module comprises an LED detection pen, wherein the bottom of the LED detection pen is provided with a detection pen nib, an annular limiting disc is sleeved on the outer side of the LED detection pen, an anti-slip movable clamping arm is hinged to the bottom of the annular limiting disc, a corresponding elastic rope is sleeved at one end of the anti-slip movable clamping arm, a plurality of corresponding limiting inserting rods are arranged on the outer side of the corresponding elastic rope, the corresponding elastic rope is arranged among the corresponding limiting inserting rods, a corresponding clamping base is fixedly arranged at the bottom of the corresponding limiting inserting rod, a first T-shaped sliding block is fixedly arranged at one side of the corresponding clamping base, a limiting rectangular block is connected to the outer side of the first T-shaped sliding block in a sliding mode, a flexible anti-slip clamping disc is spliced at the top end of the corresponding limiting inserting rod, and a second T-shaped sliding block is fixedly arranged at one side of the flexible anti-slip clamping disc;

the outside of annular spacing dish fixed mounting has push-pull type slide bar, push-pull type slide bar's top threaded connection has knob formula screw cap, push-pull type slide bar's outside sliding connection has prefabricated type spacing slide rail, knob formula screw cap's bottom cross-sectional area is greater than prefabricated type spacing slide rail's bottom cross-sectional area, prefabricated type spacing slide rail's one end fixed mounting has movable push switch, movable push switch's bottom fixed mounting has T type slide bar, T type slide bar's bottom fixed mounting has spacing slider, diamond-shaped spacing spout has been seted up to one side of spacing slider, the top of diamond-shaped spacing spout is equipped with first U type spacing groove, the bottom of diamond-shaped spacing spout is equipped with the second U type spacing groove, the utility model discloses a pen point detection device, including first U type spacing groove, second U type spacing groove, the inboard sliding connection of second U type spacing groove has the support spacing, the one end fixed mounting of support spacing has the support movable cantilever, the bottom of support movable cantilever articulates there is spacing articulated seat, the bottom fixed mounting of spacing slider has a movable spacing section of thick bamboo, the inboard of movable spacing section of thick bamboo is equipped with reset spring, reset spring's bottom is equipped with movable clamp plate, extension spring has been cup jointed in the outside of movable spacing section of thick bamboo, extension spring's outside is equipped with dustproof drum, T type slide bar is sliding connection form setting in dustproof drum's inner chamber, transparent insulating division board has been pegged graft to dustproof drum's bottom, corresponding spacing spout has been seted up to transparent insulating division board's inside, the one end setting of detecting pen point is in the inboard of corresponding spacing spout.

In a preferred embodiment, a plurality of bar-shaped anti-skidding columns are arranged on the outer side of the corresponding limiting inserted bar, and the corresponding clamping base and the flexible anti-skidding clamping disc are arranged in a clamping mode on the corresponding elastic rope through the bar-shaped anti-skidding columns of the corresponding limiting inserted bar.

In a preferred embodiment, the number of the LED detection pens is two, the two LED detection pens are arranged in a mirror symmetry mode with respect to the vertical center line of the T-shaped sliding rod, the bottom of the detection pen nib is provided with an LED lamp strip, the top of the LED lamp strip is provided with an anode and a cathode, and the detection pen nibs are arranged in a one-to-one correspondence mode with the anode and the cathode.

In a preferred embodiment, a first limiting support block is inserted into the transparent insulating isolation plate, and a first transverse support beam is fixedly installed at the bottom of the first limiting support block.

In a preferred embodiment, a first movable toothed bar is fixedly installed at the bottom of the first transverse supporting beam, and a circular gear is meshed with the outer side of the first movable toothed bar.

In a preferred embodiment, a second movable toothed bar is meshed with the outer side of the circular gear, and a second transverse supporting beam is fixedly installed at the bottom of the second movable toothed bar.

In a preferred embodiment, a second limiting support block is fixedly installed at the bottom of the second transverse support beam, and a bearing bottom plate is inserted at the bottom of the second limiting support block.

In a preferred embodiment, a protective case is arranged on the outer side of the first movable toothed bar, a knob turntable is inserted in the central position of the protective case, and the circular gear and the knob turntable are integrally arranged.

The invention has the technical effects and advantages that:

1. after the LED detection pen is fixed, the push-pull sliding rod slides in the prefabricated limiting slide rail, so that the distance between two LED detection pens is adjusted, the pen points of the detection pens are aligned with the positive electrode and the negative electrode, the knob type threaded cap is rotated to enable the knob type threaded cap to be attached to the prefabricated limiting slide rail, the push-pull sliding rod is fixed, the supporting limiting strip slides to the first U-shaped limiting groove through pressing the movable pressing switch, the first U-shaped limiting groove limits the supporting limiting strip, meanwhile, the movable pressing plate firstly fixes the LED lamp strip, the reset spring is shortened, the movable pressing plate is driven to retract into the inner cavity of the movable limiting barrel, so that the pen points of the detection pens are enabled to be in contact with the positive electrode and the negative electrode, the purpose of continuous detection is achieved, after the detection is finished, the movable pressing switch is pressed again, the supporting limiting strip slides to the right inner side of the diamond limiting slide groove, the supporting limiting strip is enabled to be fast slid to the second U-shaped limiting groove through the reactive force of the stretching spring, the LED detection pen is enabled to stay to be reset integrally, and therefore the detection pen can be enabled to complete through one-hand detection work when the detection is detected, the LED lamp strip is enabled to be in contact with the positive electrode and the LED pen points of the detection pen, the positive electrode, the detection pen is enabled to be more convenient to be in a stable manner, and the LED detection pen is enabled to be kept to be in a contact with the positive electrode and a lower place, and the LED lamp strip to be detected;

2. the corresponding limiting inserted link is grasped by one hand of a worker, and the limiting rectangular block is pushed by the other hand, so that the limiting rectangular block slides to one side of the anti-slip movable clamping arm, the anti-slip movable clamping arm clamps the outer side of the LED detection pen, then the flexible anti-slip clamping disc is pressed, the flexible anti-slip clamping disc is pressed close to the corresponding clamping base, the corresponding elastic rope is fixed, the LED detection pen is fixed, and the pen point of the detection pen is hidden at the inner side of the corresponding limiting chute, so that the danger caused by false triggering of the worker is avoided, and the safety is improved;

3. the staff is through rotating the knob carousel for circular gear rotates, utilizes circular gear to rotate and drives first movable rack and second movable rack and slide, thereby adjusts the distance between transparent insulating barrier and the bearing bottom plate, makes can detect to the not LED lamp area of co-altitude size, has consequently promoted the flexibility.

Drawings

Fig. 1 is an isometric view of the present invention.

Fig. 2 is an enlarged view of the structure of the portion a of fig. 1 according to the present invention.

Fig. 3 is a partial structural cross-sectional view of the present invention.

Fig. 4 is an enlarged view of the B-section structure of fig. 3 according to the present invention.

Fig. 5 is an enlarged view of the C-section structure of fig. 3 according to the present invention.

Fig. 6 is an enlarged view of the D portion structure of fig. 1 according to the present invention.

Fig. 7 is a schematic structural view of a corresponding limiting plug according to the present invention.

The reference numerals are: 1. an LED detection pen; 2. detecting the nib of the pen; 3. an annular limiting disc; 4. an anti-slip movable clamping arm; 5. corresponding elastic ropes; 6. a corresponding limiting inserted link; 7. the corresponding clamping base; 8. a first T-shaped slider; 9. limiting rectangular blocks; 10. a flexible anti-slip clamping disc; 11. a second T-shaped slider; 12. push-pull type sliding rod; 13. knob type screw cap; 14. prefabricated limiting slide rail; 15. a movable push switch; 16. a T-shaped sliding rod; 17. a tension spring; 18. a dust-proof cylinder; 19. transparent insulating isolation board; 20. corresponding limiting sliding grooves; 21. an LED lamp strip; 22. a positive electrode and a negative electrode; 23. the first limiting support block; 24. a first cross support beam; 25. a first movable toothed bar; 26. a circular gear; 27. a second movable toothed bar; 28. the second limiting support block; 29. a bearing bottom plate; 30. a protective chassis; 31. a knob turntable; 32. a second cross support beam; 33. a limit type sliding block; 34. diamond-shaped limiting sliding groove; 35. the first U-shaped limit groove; 36. the second U-shaped limit groove; 37. supporting and limiting strips; 38. supporting the movable cantilever; 39. limiting hinging seat; 40. a movable limit cylinder; 41. a return spring; 42. a movable pressing plate.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Example 1: referring to fig. 1-7 of the specification, a circuit detection device of a liquid crystal display module comprises an LED detection pen 1, as shown in fig. 1, a detection pen nib 2 for detection is arranged at the bottom of the LED detection pen 1, an annular limiting disc 3 is sleeved at the outer side of the LED detection pen 1, an anti-slip movable clamping arm 4 is hinged at the bottom of the annular limiting disc 3, a corresponding elastic rope 5 is sleeved at one end of the anti-slip movable clamping arm 4 and used for clamping and fixing the LED detection pen 1, the corresponding elastic rope 5 is tensioned, the anti-slip movable clamping arm 4 is used for fixing the LED detection pen 1, as shown in fig. 2, a plurality of corresponding limiting plug rods 6 are arranged at the outer side of the corresponding elastic rope 5, the corresponding elastic rope 5 is arranged among the corresponding limiting plug rods 6, the bottom of the corresponding limiting plug rods 6 is fixedly provided with a corresponding clamping base 7 used for supporting through the limiting action of the corresponding elastic rope 5, a first sliding block T-shaped block type 8 and a second sliding block type 11 are fixedly arranged at one side of the corresponding clamping base 7, a first sliding block type 8 and a second sliding block type 11T-shaped 11 sliding block type 11 are fixedly arranged at the top end of the sliding block type 8, and a second sliding block type 11 is fixedly arranged at the top end of the sliding block type 8;

referring to fig. 1-7 of the specification, as shown in fig. 4, a push-pull type sliding rod 12 is fixedly installed at the outer side of the annular limiting disc 3, a knob type threaded cap 13 is connected to the top of the push-pull type sliding rod 12 in a threaded manner, a prefabricated type limiting slide rail 14 is connected to the outer side of the push-pull type sliding rod 12 in a sliding manner, the push-pull type sliding rod 12 slides in the prefabricated type limiting slide rail 14, so that the distance between two LED detection pens 1 is adjusted, a more convenient effect is achieved, the cross-sectional area of the bottom end of the knob type threaded cap 13 is larger than that of the prefabricated type limiting slide rail 14, after the adjustment is finished, the knob type threaded cap 13 is attached to the prefabricated type limiting slide rail 14 by rotating the knob type threaded cap 13, so that the push-pull type sliding rod 12 is fixed, a movable pressing switch 15 is fixedly installed at one end of the prefabricated type limiting slide rail 14, the T-shaped sliding rod 16 is fixedly arranged at the bottom of the movable push switch 15, the limit type sliding block 33 is fixedly arranged at the bottom of the T-shaped sliding rod 16, as shown in figure 5, a diamond limit sliding groove 34 is formed in one side of the limit type sliding block 33, a first U-shaped limit groove 35 is formed in the top end of the diamond limit sliding groove 34, a second U-shaped limit groove 36 is formed in the bottom end of the diamond limit sliding groove 34, a support limit bar 37 is slidably connected to the inner side of the second U-shaped limit groove 36, a support movable cantilever 38 is fixedly arranged at one end of the support limit bar 37, a limit hinging seat 39 is hinged to the bottom of the support movable cantilever 38, a movable limit cylinder 40 is fixedly arranged at the bottom of the limit type sliding block 33, a reset spring 41 is arranged at the inner side of the movable limit cylinder 40, a movable pressing plate 42 is arranged at the bottom end of the reset spring 41, a tension spring 17 is sleeved on the outer side of the movable limit cylinder 40, a dustproof cylinder 18 is arranged on the outer side of the tension spring 17, the T-shaped sliding rod 16 is arranged in a sliding connection mode in the inner cavity of the dustproof cylinder 18, and the T-shaped sliding rod 16 and the extension spring 17 are limited through the dustproof cylinder 18;

referring to fig. 1-7 of the specification, as shown in fig. 3, a transparent insulating spacer 19 is inserted into the bottom of the dustproof cylinder 18, a corresponding limit chute 20 is opened in the transparent insulating spacer 19, one end of the detection pen nib 2 is disposed inside the corresponding limit chute 20, the detection pen nib 2 is hidden inside the corresponding limit chute 20, thereby avoiding false triggering danger by workers, a plurality of bar-shaped anti-slip posts are disposed on the outer side of the corresponding limit plunger 6, the corresponding clamping base 7 and the flexible anti-slip clamp disc 10 are arranged in a clamping shape to the corresponding elastic rope 5 through the bar-shaped anti-slip posts of the corresponding limit plunger 6, the corresponding limit plunger 6 is manually pushed by workers, the other hand pushes the corresponding limit rectangular block 9, the limit rectangular block 9 slides to one side of the anti-slip movable clamping arm 4, the outer side of the LED detection pen nib 1 is clamped by the anti-slip movable clamping arm 4, then the flexible anti-slip clamp disc 10 is pressed, the corresponding aperture of the corresponding clamping ring 10 is fixed to the corresponding elastic cord 5 by the corresponding clamping base 7 by the flexible anti-slip clamp disc 10, the number of the corresponding limit plunger 6 is fixed by the corresponding clamping ring 10, and the number of the corresponding anti-slip posts is fixed by the corresponding clamping ring 10 to the corresponding limit plunger 6, and the number of the corresponding limit plunger 6 is fixed by the corresponding elastic ring 6, the two LED detection pens 1 are arranged in a mirror symmetry mode with respect to the vertical center line of the T-shaped sliding rod 16, the bottom of the detection pen nib 2 is provided with an LED lamp strip 21, the top of the LED lamp strip 21 is provided with an anode and a cathode 22, and the detection pen nib 2 and the anode and the cathode 22 are arranged in a one-to-one correspondence mode.

It should be noted that, when the device is actually used, a worker grasps the corresponding limit plunger 6 by one hand and pushes the limit rectangular block 9 by the other hand, so that the limit rectangular block 9 slides to one side of the anti-slip movable clamping arm 4, the anti-slip movable clamping arm 4 clamps the outer side of the LED detection pen 1, then presses the flexible anti-slip clamping disc 10, and uses the flexible anti-slip clamping disc 10 to be close to the corresponding clamping base 7, so as to fix the corresponding elastic rope 5, so that the LED detection pen 1 is fixed, after the LED detection pen 1 is fixed, the push-pull sliding rod 12 slides in the prefabricated limit slide rail 14, so that the distance between the two LED detection pens 1 is adjusted, the detection pen point 2 aligns with the positive and negative electrodes 22, the knob screw cap 13 is attached to the prefabricated limit slide rail 14 by rotating the knob screw cap 13, thereby fixing the push-pull type sliding rod 12, compressing the extension spring 17 by pressing the movable push switch 15, wholly descending by the T-shaped sliding rod 16, extruding the extension spring 17 by the limit type sliding block 33, sliding the support limit bar 37 on the left inner side of the diamond limit sliding groove 34 by the limit type sliding block 33 when descending, enabling the support movable cantilever 38 to deviate along with the support limit bar 37, stopping when the support limit bar 37 slides to the first U-shaped limit groove 35, enabling the first U-shaped limit groove 35 to limit the support limit bar 37, simultaneously, descending the limit type sliding block 33 to drive the movable pressing plate 42 to descend to contact with the LED lamp strip 21, fixing the movable pressing plate 42 to the LED lamp strip 21 at first, extruding the reset spring 41 in the process of continuously downwards pressing the limit type sliding block 33, shortening the reset spring 41, simultaneously driving the movable pressing plate 42 to retract into the inner cavity of the movable limiting cylinder 40, thereby leaving space to make the detection pen nib 2 contact with the anode and cathode 22, achieving the purpose of detection, after detecting, pressing the movable push switch 15 again for the support limit bar 37 slides to the right inner side of the diamond-shaped limit chute 34, utilizes the reaction force of the extension spring 17, makes the support limit bar 37 slide fast to the second U-shaped limit chute 36 and stays fixedly, and makes the whole rising reset of the LED detection pen 1.

Example 2: referring to fig. 1-7 of the specification, as shown in fig. 6, a first limiting support block 23 for supporting and limiting is inserted into the transparent insulating isolation board 19, a first transverse support beam 24 for supporting the transparent insulating isolation board 19 is fixedly installed at the bottom of the first limiting support block 23, the transparent insulating isolation board 19 is lifted by the first transverse support beam 24, a first movable rack bar 25 is fixedly installed at the bottom of the first transverse support beam 24, a circular gear 26 is meshed with the outer side of the first movable rack bar 25, a second movable rack bar 27 is meshed with the outer side of the circular gear 26, a second transverse support beam 32 is fixedly installed at the bottom of the second movable rack bar 27, a second limiting support block 28 for fixing and limiting is fixedly installed at the bottom of the second transverse support beam 32, a bearing bottom plate 29 for supporting is inserted at the bottom of the second limiting support block 28, a protection case 30 is arranged at the outer side of the first movable rack bar 25, the protection case 30 plays a role in protecting the circular gear 26, a rotary table 31 is inserted into the central position of the protection case 30, and the rotary table 26 and the rotary table 31 are integrally rotated by the rotary table 31.

It should be noted that, when the device is actually used, a worker rotates the knob turntable 31 to rotate the circular gear 26, and the circular gear 26 rotates to drive the first movable toothed bar 25 and the second movable toothed bar 27 to slide, so as to adjust the distance between the transparent insulating isolation plate 19 and the bearing bottom plate 29.

The last points to be described are: first, in the description of the present application, it should be noted that, unless otherwise specified and defined, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be mechanical or electrical, or may be a direct connection between two elements, and "upper," "lower," "left," "right," etc. are merely used to indicate relative positional relationships, which may be changed when the absolute position of the object being described is changed;

secondly: in the drawings of the disclosed embodiments, only the structures related to the embodiments of the present disclosure are referred to, and other structures can refer to the common design, so that the same embodiment and different embodiments of the present disclosure can be combined with each other under the condition of no conflict;

finally: the foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.

Claims

1. The utility model provides a circuit detection device of liquid crystal display module, includes LED detection pen (1), its characterized in that: the LED detection pen comprises an LED detection pen body, wherein the bottom of the LED detection pen body (1) is provided with a detection pen nib (2), the outer side of the LED detection pen body (1) is sleeved with an annular limiting disc (3), one side of the annular limiting disc (3) is fixedly provided with a first T-shaped sliding block (8), one end of the first T-shaped sliding block (8) is sleeved with a corresponding elastic rope (5), the outer side of the corresponding elastic rope (5) is provided with a plurality of corresponding limiting inserting rods (6), the number of the corresponding elastic ropes (6) is set to be multiple, the corresponding elastic rope (5) is arranged among the corresponding limiting inserting rods (6), the bottom of the corresponding limiting inserting rod (6) is fixedly provided with a corresponding clamping base (7), one side of the corresponding clamping base (7) is fixedly provided with a first T-shaped sliding block (8), the outer side of the first T-shaped sliding block (8) is slidably connected with a limiting rectangular block (9), the top end of the corresponding limiting inserting rod (6) is spliced with a flexible anti-sliding clamping disc (10), and the bottom of the corresponding limiting inserting rod (6) is fixedly provided with a second T-shaped sliding block (11).

The utility model discloses a cantilever hinge type sliding device, including annular spacing dish (3), push-pull type slide bar (12) is fixed mounting in the outside of annular spacing dish (3), the top threaded connection of push-pull type slide bar (12) has knob formula screw cap (13), the outside sliding connection of push-pull type slide bar (12) has prefabricated type spacing slide rail (14), the bottom cross-sectional area of knob formula screw cap (13) is greater than the bottom cross-sectional area of prefabricated type spacing slide rail (14), the one end fixed mounting of prefabricated type spacing slide rail (14) has movable push switch (15), the bottom fixed mounting of movable push switch (15) has T type slide bar (16), the bottom fixed mounting of T type slide bar (16) has spacing slider (33), one side of spacing slider (33) has been seted up rhombus spacing spout (34), the top of rhombus spacing spout (34) is equipped with first U type spacing groove (35), the bottom of rhombus spacing spout (34) is equipped with second U type spacing groove (36), the inboard sliding connection of second U type spacing groove (36) has support spacing strip (37), the bottom fixed mounting of support strip (37) has movable hinge type spacing base (38), the inside of a movable limiting cylinder (40) is provided with a reset spring (41), the bottom of the reset spring (41) is provided with a movable pressing plate (42), the outside of the movable limiting cylinder (40) is sleeved with a tension spring (17), the outside of the tension spring (17) is provided with a dustproof cylinder (18), a T-shaped sliding rod (16) is arranged in a sliding connection mode in the inner cavity of the dustproof cylinder (18), the bottom of the dustproof cylinder (18) is inserted with a transparent insulating isolation plate (19), a corresponding limiting chute (20) is formed in the transparent insulating isolation plate (19), and one end of a pen point (2) is arranged on the inner side of the corresponding limiting chute (20).

2. The circuit testing device of claim 1, wherein: the outside of corresponding spacing inserted bar (6) is equipped with a plurality of bar anti-skidding posts, bar anti-skidding post to corresponding bungee cord (5) through corresponding spacing inserted bar (6) is the centre gripping form setting with flexible anti-skidding joint dish (10) corresponding joint base (7).

3. The circuit testing device of claim 1, wherein: the LED pen comprises a plurality of LED detection pens (1), wherein the number of the LED detection pens (1) is two, the two LED detection pens (1) are arranged in a mirror symmetry mode with respect to the vertical center line of a T-shaped sliding rod (16), an LED lamp strip (21) is arranged at the bottom of a detection pen nib (2), positive and negative electrodes (22) are arranged at the top of the LED lamp strip (21), and the detection pen nibs (2) are arranged in a one-to-one correspondence mode with the positive and negative electrodes (22).

4. A circuit inspection apparatus for a liquid crystal display module according to claim 3, wherein: the inside of transparent insulating division board (19) is pegged graft and is had first spacing supporting shoe (23), the bottom fixed mounting of first spacing supporting shoe (23) has a first horizontal supporting beam (24).

5. The circuit testing device of claim 4, wherein: the bottom of the first transverse supporting beam (24) is fixedly provided with a first movable toothed bar (25), and a circular gear (26) is meshed with the outer side of the first movable toothed bar (25).

6. The circuit testing device of claim 5, wherein: the outer side of the circular gear (26) is meshed with a second movable toothed bar (27), and a second transverse supporting beam (32) is fixedly arranged at the bottom of the second movable toothed bar (27).

7. The circuit testing device of claim 6, wherein: the bottom of the second transverse supporting beam (32) is fixedly provided with a second limiting supporting block (28), and the bottom of the second limiting supporting block (28) is inserted with a bearing bottom plate (29).

8. The circuit testing device of claim 7, wherein: the outside of first movable rack bar (25) is equipped with protection machine case (30), the central point department of protection machine case (30) has pegged graft and has been had knob carousel (31), circular gear (26) are integrated with knob carousel (31) and set up.