CN111366775A

CN111366775A - Self-detecting test pencil

Info

Publication number: CN111366775A
Application number: CN202010318278.9A
Authority: CN
Inventors: 辛晓君
Original assignee: Wenzhou Yang'an Electronic Technology Co ltd
Current assignee: SHENGDA ELECTRIC Co.,Ltd.
Priority date: 2020-04-21
Filing date: 2020-04-21
Publication date: 2020-07-03
Anticipated expiration: 2040-04-21
Also published as: JP2021173742A; CN111366775B

Abstract

The invention discloses a self-detecting test pencil, which comprises a test pencil, wherein a test head sliding groove with an upward opening is arranged in the test pencil, a power-on sliding block groove with an upward opening and communicated with the test head sliding groove is arranged on the inner bottom wall of the test head sliding groove, a battery is fixedly arranged on the inner wall of the right side of the power-on sliding block groove, a charging socket with a rightward opening is fixedly and electrically connected to the end surface of the right side of the battery, and a grounding mechanism is arranged on the inner bottom wall of the power-on sliding block groove; the invention utilizes the grounding mechanism connected with the ground through the inhaul cable in the test pencil to be connected with the ground in an adsorption manner, so that the test pencil can bypass a human body to directly form a loop with the ground to test a charged body, the potential safety hazard to the human body caused by overlarge voltage and current in the charged body is avoided, the self-detection of a neon lamp and a grounding circuit in the test pencil is realized through the matching of the internal limiting structure of the test pencil and a circuit, and the circuit misjudgment caused by the fault of the test pencil is avoided.

Description

Self-detecting test pencil

Technical Field

The invention relates to the field of circuit test equipment, in particular to a self-test pencil.

Background

With the popularization of electric energy, circuit installation and maintenance work are more and more important in order to test whether an electrician is electrified in a wire, and a test pen is generally used for testing.

At present, when an electrician uses the test pencil, the electrician sometimes can misjudge whether the circuit is electrified due to the problem of the fault of the test pencil, and the test pencil needs to touch the metal part at the tail end of the test pencil by hands, so that the electrified body, the test pencil, a human body and the ground form a loop to complete the test, and a certain potential safety hazard can exist when the human body forms the loop directly.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a self-detecting test pencil, which is characterized in that a grounding mechanism connected with the ground through a guy cable in the test pencil is used for being connected with the ground in an adsorption manner, so that the test pencil can bypass a human body to directly form a loop with the ground to test a charged body, the potential safety hazard brought to the human body during the test caused by overlarge voltage and current in the charged body is avoided, the self-detection of a neon lamp and a grounding circuit in the test pencil is realized through the matching of an internal limiting structure of the test pencil and a circuit, and the circuit misjudgment caused by the fault of the test pencil is avoided.

The invention discloses a self-detection test pencil, which comprises a pencil body, wherein a test head sliding groove with an upward opening is arranged in the test pencil, a power-on sliding block groove with an upward opening and communicated with the test head sliding groove is arranged on the inner bottom wall of the test head sliding groove, a battery is fixedly arranged on the inner wall of the right side of the power-on sliding block groove, a charging socket with a rightward opening is fixedly and electrically connected to the end surface of the right side of the battery, a grounding mechanism is arranged on the inner bottom wall of the power-on sliding block groove, and a push plate sliding groove which is symmetrical up and down and has a rightward opening;

a push plate is arranged in the push plate chute in a sliding manner, a push plate spring fixedly connected with the inner wall of the left side of the push plate chute is fixedly arranged on the end surface of the left side of the push plate, a push plate pull rope is fixedly arranged on the end surface of the left side of the push plate, a push plate fixture block chute with an upward opening is arranged on the inner bottom wall of the push plate chute, a push plate fixture block is arranged in the push plate fixture block chute in a sliding manner, a push plate fixture block spring fixedly connected with the inner bottom wall of the push plate fixture block chute is fixedly arranged on the end surface of the bottom of the push plate fixture block, a measuring head reset spring fixedly connected with the inner bottom wall of the measuring head chute is fixedly arranged on the end surface of the bottom of the measuring head, a driving rod chute runs through the inner wall of, the test fixture comprises a driving lever, a driving lever sliding groove, a clamping block spring and a clamping block spring, wherein the other end of the driving lever, far away from the pushing plate, of the pushing plate pulling rope is fixedly connected to the top end face of the driving lever, the driving lever is fixedly arranged on the top end face of the portion, located in the driving lever sliding groove, of the driving lever, the driving lever resetting spring is fixedly connected with the inner top wall of the driving lever sliding groove, a clamping block sliding groove with a leftward opening is formed in the end face of.

Furthermore, permanent magnet sliding cavities which are symmetrical up and down are arranged on the inner wall of the left side of the electrified sliding block groove, a neon lamp which is positioned between the two permanent magnet sliding cavities is fixedly arranged on the inner wall of the left side of the electrified sliding block groove, a display through hole with an opening communicated with the outside to the left is arranged on the end surface of the left side of the neon lamp, an electromagnet is fixedly arranged on the end surface of the right side of the permanent magnet sliding cavity, a permanent magnet is arranged in the permanent magnet sliding cavity in a sliding manner, an electrified block is fixedly arranged in the permanent magnet, a magnet reset spring fixedly connected with the inner wall of the left side of the permanent magnet sliding cavity is fixedly arranged on the end surface of the left side of the permanent magnet, first conducting strips which are symmetrical left and right and matched with the electrified block are fixedly arranged on the top wall in the permanent magnet, the neon lamp upper and lower end faces are fixedly provided with neon lamp positive conducting strips which extend into the permanent magnet sliding cavity and are electrically connected with the electrifying block towards the direction far away from the neon lamp, the bottom end face of the electromagnet is electrically connected with a wire electrically connected with the negative electrode of the battery, the left end face of the electrifying slider groove is fixedly provided with a third conducting strip, the left end face of the electrifying slider groove is fixedly provided with a fourth conducting strip which is positioned at the lower side of the third conducting strip and is electrically connected with the electromagnet positive electrode at the upper side, the left end face of the electrifying slider groove is fixedly provided with a fifth conducting strip which is positioned at the lower side of the fourth conducting strip and is electrically connected with the electromagnet positive electrode at the lower side, the right end face of the electrifying slider groove is fixedly provided with a sixth conducting strip which is electrically connected with the battery positive electrode, The fourth conducting strip, the fifth conducting strip and the sixth conducting strip are matched with a power-on sliding block, a measuring head is arranged in the measuring head sliding groove in a sliding mode, and the measuring head is fixedly connected with the power-on sliding block through a measuring head connecting rod.

Further, the grounding mechanism comprises a grounding block sliding groove with a downward opening and arranged on the inner bottom wall, a connecting cavity with a downward opening and arranged on the inner top wall of the grounding block sliding groove is arranged on the inner top wall of the connecting cavity, a trapezoidal block sliding groove with a leftward opening and arranged on the inner wall of the right side of the connecting cavity is arranged on the inner wall of the right side of the connecting cavity, a trapezoidal block is arranged in the trapezoidal block sliding groove in a sliding manner, a trapezoidal block electromagnetic spring fixedly connected with the inner wall of the right side of the trapezoidal block sliding groove is fixedly arranged on the end face of the right side of the trapezoidal block, a grounding conducting strip located on the left side of the connecting cavity and electrically connected with the third conducting strip through a circuit is fixedly arranged on the inner top wall of the grounding block sliding groove, a grounding block is arranged in the grounding block sliding groove in a sliding manner, a positioning cavity is arranged in the grounding block, a positioning fixture block sliding groove with a positioning fixture block spring A hook plate pull rope is fixedly arranged on the end surface of the rear side of the positioning fixture block, a positioning rod is arranged in the positioning cavity in a sliding manner, a positioning rod pull rope is fixedly arranged on the end surface of the top part of the positioning rod, a suction disc cavity extending downwards is arranged on the bottom wall in the positioning cavity in a penetrating manner, a suction disc matched with the suction disc cavity is fixedly arranged on the end surface of the bottom part of the grounding block, a sealing plate is arranged in the suction disc cavity in a sliding manner, a sealing plate reset spring fixedly connected with the top wall in the suction disc cavity is fixedly arranged on the end surface of the top part of the sealing plate, a sealing plate connecting rod extending into the positioning cavity and fixedly connected with the end surface of the bottom part of the positioning rod is fixedly connected on the end surface of the top part of the sealing plate, a winding wheel cavity with an upward opening is fixedly arranged on the, the other end of the positioning rod stay cord far away from the positioning rod is fixedly wound on the positioning rod rope-pulling wheel, a connecting winding wheel positioned at the left side of the positioning rod rope-pulling wheel is fixedly arranged on the winding wheel shaft, a connecting stay cord is fixedly wound on the connecting winding wheel, a torsion spring fixedly connected with the left side inner wall of the winding wheel cavity is fixedly arranged on the left end face of the connecting winding wheel, the other end of the connecting stay cord far away from the connecting winding wheel extends into the grounding block chute to be fixedly connected with the grounding conducting strip, a hook plate chute with an upward opening is arranged on the top end face of the grounding block, a hook plate extending upwards into the connecting cavity to be abutted against the trapezoidal block is arranged in the hook plate chute in a sliding manner, the other end of the hook plate stay cord far away from the positioning fixture block is fixedly connected on the left end face of the hook plate, and a hook plate spring fixedly connected with the right side inner wall of the hook plate chute, and the bottom end face of the grounding block is fixedly provided with grounding metal sheets which are bilaterally symmetrical and are electrically connected with the grounding conducting strip through a circuit.

Furthermore, the first conducting strip on the left side is electrically connected with the measuring head through a circuit, the first conducting strip on the right side is electrically connected with the fourth conducting strip through a circuit, the second conducting strip on the left side is electrically connected with the grounding conducting strip through a circuit, the second conducting strip on the right side is electrically connected with the negative electrode of the battery through a circuit, so that a first circuit for detection is formed among the first conducting strip on the left side, the neon lamp anode conducting strip, the neon lamp left side, the second conducting strip on the left side, the grounding conducting strip and the grounding metal sheet, a second circuit for self-detection of a grounding circuit is formed among the anode of the battery, the first conducting strip on the right side, the neon lamp anode conducting strip, the neon lamp, the second conducting strip on the left side, the grounding conducting strip and the grounding metal sheet, and the second circuit for self-detection of the grounding circuit is formed, A third circuit for self-checking the neon lamp is formed between the first conducting strip on the right side and the neon lamp anode conducting strip, between the neon lamp and the second conducting strip on the right side and between the neon lamp and the negative electrode of the battery, the push plate fixture block spring on the lower side is connected with the third circuit in series, the push plate fixture block spring on the upper side is connected with the second circuit in series, and the trapezoidal block electromagnetic spring is connected with the third circuit in series.

Furthermore, the elasticity of the push plate spring is greater than that of the fixture block spring.

The invention has the beneficial effects that: the invention utilizes the grounding mechanism connected with the ground through the inhaul cable in the test pencil to be connected with the ground in an adsorption manner, so that the test pencil can bypass a human body to directly form a loop with the ground to test a charged body, the potential safety hazard to the human body caused by overlarge voltage and current in the charged body is avoided, the self-detection of a neon lamp and a grounding circuit in the test pencil is realized through the matching of the internal limiting structure of the test pencil and a circuit, and the circuit misjudgment caused by the fault of the test pencil is avoided.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1 according to an embodiment of the present invention;

FIG. 3 is an enlarged schematic view of the structure at B in FIG. 1 according to an embodiment of the present invention;

FIG. 4 is an enlarged schematic structural diagram of the embodiment of the present invention at C in FIG. 1.

Detailed Description

The invention will now be described in detail with reference to fig. 1-4, wherein for ease of description the orientations described hereinafter are now defined as follows: the up, down, left, right, and front-back directions described below correspond to the up, down, left, right, and front-back directions in the projection relationship of fig. 1 itself.

The test pencil with self-detection described in conjunction with fig. 1-4 comprises a test pencil 10, wherein the test pencil 10 is provided with a probe chute 12 with an upward opening, a power-on slider groove 73 with an upward opening and communicated with the probe chute 12 is provided on the inner bottom wall of the probe chute 12, a battery 41 is fixedly provided on the inner wall of the right side of the power-on slider groove 73, the battery 41 is electrically connected to a charging socket 40 with a rightward opening on the end face of the right side, a grounding mechanism is provided on the inner bottom wall of the power-on slider groove 73, a push plate chute 52 with a rightward opening and a vertically symmetrical point is provided on the inner wall of the left side of the probe chute 12, a push plate 51 is slidably provided in the push plate chute 52, a push plate spring 50 fixedly connected to the inner wall of the left side of the push plate chute 52 is fixedly provided on the end face of the left side of the push plate 51, a push plate pull, a push plate fixture block 61 is arranged in the push plate fixture block sliding groove 60 in a sliding manner, a push plate fixture block spring 62 fixedly connected with the inner bottom wall of the push plate fixture block sliding groove 60 is fixedly arranged on the bottom end surface of the push plate fixture block 61, a measuring head return spring 43 fixedly connected with the inner bottom wall of the measuring head sliding groove 12 is fixedly arranged on the bottom end surface of the measuring head 46, a deflector rod sliding groove 45 is arranged on the inner wall of the right side of the measuring head sliding groove 12 in a left-right through manner, a measuring head deflector rod sliding groove 48 with a right opening is arranged on the end surface of the right side of the measuring head 46, a deflector rod 47 extending rightwards and penetrating through the deflector rod sliding groove 45 is arranged in the measuring head deflector rod sliding groove 48 in a sliding manner, the other end of the push plate pull rope 11 far away from the push plate 51 is fixedly connected on the end, a fixture block sliding groove 53 with a leftward opening is formed in the left end face of the measuring head 46, a fixture block 54 is slidably arranged in the fixture block sliding groove 53, and a fixture block spring 55 fixedly connected with the right inner wall of the fixture block sliding groove 53 is fixedly arranged on the right end face of the fixture block 54.

Beneficially, permanent magnet sliding cavities 68 which are symmetrical up and down are formed in the inner wall of the left side of the electrified sliding block slot 73, a neon lamp 66 which is located between the two permanent magnet sliding cavities 68 is fixedly arranged on the inner wall of the left side of the electrified sliding block slot 73, a display through hole which is opened leftwards and communicated with the outside is formed in the end face of the left side of the neon lamp 66, an electromagnet 77 is fixedly arranged on the end face of the right side of the permanent magnet sliding cavity 68, a permanent magnet 64 is arranged in the permanent magnet sliding cavity 68 in a sliding mode, an electrified block 75 is fixedly arranged in the permanent magnet 64, a magnet reset spring 63 which is fixedly connected with the inner wall of the left side of the permanent magnet sliding cavity 68 is fixedly arranged on the end face of the left side of the permanent magnet 64, first conducting strips 69 which are symmetrical left and right and matched with the electrified block 75 are fixedly arranged on the inner top wall of the permanent magnet sliding, the neon lamp 66 is fixedly provided with neon lamp positive electrode conducting strips 57 extending into the permanent magnet sliding cavity 68 and electrically connected with the electrifying block 75 in a direction away from the neon lamp 66 on the upper and lower end faces thereof, the electromagnet 77 is electrically connected with a lead 78 electrically connected with the negative electrode of the battery 41 on the bottom end face thereof, the electrifying slider groove 73 is fixedly provided with a third conducting strip 71 on the left end face thereof, the electrifying slider groove 73 is fixedly provided with a fourth conducting strip 76 positioned on the lower side of the third conducting strip 71 and electrically connected with the positive electrode of the electromagnet 77 on the upper side thereof, the electrifying slider groove 73 is fixedly provided with a fifth conducting strip 79 positioned on the lower side of the fourth conducting strip 76 and electrically connected with the positive electrode of the electromagnet 77 on the lower side thereof, the electrifying slider groove 73 is fixedly provided with a sixth conducting strip 74 electrically connected with the positive electrode of the battery 41 on, the energizing slider 72 matched with the third conducting strip 71, the fourth conducting strip 76, the fifth conducting strip 79 and the sixth conducting strip 74 is arranged in the energizing slider groove 73 in a sliding manner, the measuring head 46 is arranged in the measuring head sliding groove 12 in a sliding manner, and the measuring head 46 is fixedly connected with the energizing slider 72 through the measuring head connecting rod 44.

Advantageously, the grounding mechanism comprises a grounding block sliding groove 22 with a downward opening formed in the inner bottom wall, a connecting cavity 39 with a downward opening formed in the inner top wall of the grounding block sliding groove 22, a trapezoidal block sliding groove 37 with a leftward opening formed in the inner wall of the right side of the connecting cavity 39, a trapezoidal block 38 slidably disposed in the trapezoidal block sliding groove 37, a trapezoidal block electromagnetic spring 36 fixedly connected to the inner wall of the right side of the trapezoidal block sliding groove 37 and fixedly disposed on the right side end face of the trapezoidal block 38, a grounding conductive plate 15 electrically connected to the third conductive plate 71 and positioned on the left side of the connecting cavity 39 and fixedly disposed on the inner top wall of the grounding block sliding groove 22, a grounding block 23 slidably disposed in the grounding block sliding groove 22, a positioning cavity 20 disposed in the grounding block 23, a positioning block sliding groove 84 with a forward opening formed in the inner wall of the rear side of the positioning cavity 20, and a positioning block 85 slidably, a positioning fixture block spring 83 fixedly connected with the rear inner wall of the positioning fixture block sliding groove 84 is fixedly arranged on the rear end face of the positioning fixture block 85, a hook plate pull rope 81 is fixedly arranged on the rear end face of the positioning fixture block 85, a positioning rod 21 is slidably arranged in the positioning cavity 20, a positioning rod pull rope 31 is fixedly arranged on the top end face of the positioning rod 21, a downwardly extending suction cup cavity 26 is arranged on the bottom wall of the positioning cavity 20 in a penetrating manner, a suction cup 25 matched with the suction cup cavity 26 is fixedly arranged on the bottom end face of the grounding block 23, a sealing plate 27 is slidably arranged in the suction cup cavity 26, a sealing plate return spring 29 fixedly connected with the top wall of the suction cup cavity 26 is fixedly arranged on the top end face of the sealing plate 27, and a sealing plate connecting rod 28 fixedly connected with the bottom end face of the positioning rod 21 and extending into the positioning cavity 20 is fixedly, a winding wheel cavity 34 with an upward opening is fixedly arranged on the top wall in the positioning cavity 20, a winding wheel shaft 33 is rotatably connected on the left inner wall and the right inner wall of the winding wheel cavity 34, a positioning rod rope pulling wheel 32 is arranged on the winding wheel shaft 33 in a friction fit manner, the other end of the positioning rod pulling rope 31 far away from the positioning rod 21 is fixedly wound on the positioning rod rope pulling wheel 32, a connecting winding wheel 19 positioned on the left side of the positioning rod rope pulling wheel 32 is fixedly arranged on the winding wheel shaft 33, a connecting pulling rope 17 is fixedly wound on the connecting winding wheel 19, a torsion spring 18 fixedly connected with the left inner wall of the winding wheel cavity 34 is fixedly arranged on the left end face of the connecting winding wheel 19, the other end of the connecting pulling rope 17 far away from the connecting winding wheel 19 extends into the grounding block sliding groove 22 to be fixedly connected with the grounding conductive sheet 15, and a hook plate sliding groove 80 with an upward opening, the hook plate sliding groove 80 is internally provided with a hook plate 13 which upwards extends into the connecting cavity 39 and is abutted to the trapezoidal block 38 in a sliding manner, the left end face of the hook plate 13 is fixedly connected with the other end of the hook plate pull rope 81 far away from the positioning clamping block 85, the right end face of the hook plate 13 is fixedly provided with a hook plate spring 82 fixedly connected with the right inner wall of the hook plate sliding groove 80, and the bottom end face of the grounding block 23 is fixedly provided with a left-right symmetrical grounding metal sheet 24 which is electrically connected with the grounding conducting sheet 15 through a circuit.

Advantageously, the first conducting strip 69 on the left side is electrically connected to the measuring head 46 through a circuit, the first conducting strip 69 on the right side is electrically connected to the fourth conducting strip 76 through a circuit, the second conducting strip 58 on the left side is electrically connected to the grounding conducting strip 15 through a circuit, the second conducting strip 58 on the right side is electrically connected to the negative electrode of the battery 41 through a circuit, so that a first circuit for detection is formed among the first conducting strip 69 on the left side, the neon lamp positive conducting strip 57, the neon lamp 66, the second conducting strip 58 on the left side, the grounding conducting strip 15 and the grounding metal strip 24, and a second circuit for a self-detection grounding line is formed among the first conducting strip 69 on the right side, the neon lamp positive conducting strip 57, the neon lamp 66, the second conducting strip 58 on the left side, the grounding conducting strip 15 and the grounding metal strip 24, a third circuit for self-checking the neon lamp 66 is formed among the positive electrode of the battery 41, the first conducting strip 69 on the right side, the neon lamp positive conducting strip 57, the neon lamp 66, the second conducting strip 58 on the right side and the negative electrode of the battery 41, the push plate fixture block spring 62 on the lower side is connected with the third circuit in series, the push plate fixture block spring 62 on the upper side is connected with the second circuit in series, and the trapezoidal block electromagnetic spring 36 is connected with the third circuit in series.

Advantageously, the push plate spring 50 has an elastic force greater than that of the latch spring 55.

In an initial state, the measuring head 46 is located at an upper limit position under the action of the measuring head return spring 43, so that the latch 54 is retracted in the latch sliding groove 53, the energizing slider 72 is located at the upper limit position and electrically connected to the third conductive plate 71, the shift lever 47 is located at the upper limit position under the action of the shift lever return spring 49, the push plate 51 is located at a right limit position on the right side of the push plate latch 61 under the action of the push plate spring 50, the push plate latch 61 is located at the upper limit position and extends into the push plate sliding groove 52 under the action of the push plate latch spring 62, the permanent magnet 64 is located at a left limit position under the action of the magnet return spring 63, so that the energizing block 75 is electrically connected to the first conductive plate 69 on the left side, and the hook plate 13 is located at the left limit position under the action of the hook plate spring 82, the trapezoidal block 38 extends into the connecting cavity 39 under the action of the trapezoidal block electromagnetic spring 36 to abut against the hook plate 13, the sealing plate 27 is located at a lower limit position under the action of the sealing plate connecting rod 28, so that the positioning rod 21 is located at the lower limit position to abut against the inner bottom wall of the positioning cavity 20, and the positioning latch 85 is located at a front limit position under the action of the positioning latch spring 83 to extend into the positioning cavity 20.

Before the test pencil is used, the test pencil is self-tested, the shift lever 47 is pressed downwards, the shift lever 47 drives the measuring head 46 to move downwards to a lower limit position, the shift lever 47 moves downwards to pull the push plate pull rope 11, so that the push plate 51 moves leftwards to the left side of the push plate clamping block 61, the right end face of the push plate 51 is abutted to the left end face of the push plate clamping block 61, when the measuring head 46 is positioned at the lower limit position, the clamping block 54 moves leftwards to be clamped into the push plate sliding groove 52 at the lower side under the action of the clamping block spring 55, so that the measuring head 46 stops at the lower limit position, the shift lever 47 returns upwards to an initial state under the action of the shift lever reset spring 49, so that the push plate pull rope 11 is loosened, the measuring head 46 moves downwards to push the energizing sliding block 72 to move downwards, so that the energizing sliding block 72 is electrically disconnected from the third conducting strip 71, when the clamping block 54 is clamped, thereby looping the third circuit; the neon lamp 66 is not lighted, which represents that the third circuit is abnormal, and the neon lamp 66 has a fault and needs to be repaired; the neon lamp 66 is bright, representing that the third circuit is powered on, so that the push plate fixture block 61 on the lower side is downwards contracted in the push plate fixture block chute 60 on the lower side under the action of the push plate fixture block spring 62 on the lower side to be separated from the butting with the push plate 51 on the lower side, so that the push plate 51 on the lower side is rightwards displaced to jack the fixture block 54 under the action of the push plate spring 50 on the lower side, the push plate spring 50 is rightwards displaced to be separated from the butting with the inner top wall of the push plate chute 52 on the lower side, the measuring head 46 is upwards displaced under the action of the measuring head return spring 43 until the fixture block 54 is clamped in the push plate chute 52 on the upper side under the action of the fixture block spring 55, the third circuit is powered on, so that the trapezoidal block 38 is right; at this time, the measuring head 46 drives the energizing slider 72 to move upward, so that the energizing slider 72 is electrically disconnected from the fifth conductive sheet 79, thereby powering off the electromagnet 77 on the lower side, the permanent magnet 64 on the lower side returns to the initial position to the left under the action of the magnet return spring 63 on the lower side, so that the energizing block 75 on the lower side is electrically disconnected from the second conductive sheet 58 on the right side, and the energizing block 75 on the lower side is electrically connected to the second conductive sheet 58 on the left side, the grounding block 23 is taken out downward and vertically placed on the ground, the electric pen 10 is pulled upward, the connecting cable 17 is pulled to drive the connecting winding wheel 19 to rotate forward, the torsion spring 18 stores force, the positioning rod pulling wheel 32 coaxial with the connecting winding wheel 19 is driven to rotate, the positioning rod pulling rope 31 is pulled, thereby driving the positioning rod 21 to move upward until the top end face of the positioning rod 21 abuts against, the positioning fixture block 85 extends forwards into the positioning cavity 20 under the action of the positioning fixture block spring 83 to abut against the end face of the bottom of the positioning rod 21, the positioning rod 21 moves upwards to drive the sealing plate 27 to move upwards, so that the space in the suction disc cavity 26, which is positioned at the lower side of the sealing plate 27, is enlarged, the air pressure in the space in the suction disc cavity 26, which is positioned at the lower side of the sealing plate 27, is smaller than the atmospheric pressure, the adsorption action is completed, the grounding metal sheet 24 abuts against the ground, and the second circuit forms a loop; at this time, the neon lamp 66 is not lighted, which represents that the second circuit is abnormal, the grounding line is in fault, and the grounding position needs to be repaired or replaced; the neon lamp 66 is on, representing that the second circuit is powered on, so that the push plate fixture block 61 on the upper side is downwards contracted in the push plate fixture block chute 60 on the upper side under the action of the push plate fixture block spring 62 on the upper side to be separated from abutting contact with the push plate 51 on the upper side, so that the push plate 51 on the upper side is rightwards displaced to press the fixture block 54 under the action of the push plate spring 50 on the upper side, the push plate spring 50 is rightwards displaced to be separated from abutting contact with the inner top wall of the push plate chute 52 on the upper side, the measuring head 46 is upwards displaced to return to the initial position under the action of the measuring head return spring 43, the measuring head 46 upwards displaces to return to the initial position to drive the powered sliding block 72 to return to the initial state, the powered sliding block 72 is electrically disconnected from the fourth conducting strip 76 and the; after the grounding position is changed or the electrography is finished to use, the hook plate 13 is pulled rightwards, the hook plate 13 drives the positioning fixture block 85 to move backwards through the hook plate pull rope 81, so that the positioning fixture block 85 is contracted in the positioning fixture block spring 83 to be separated from the abutting joint with the positioning rod 21, the sealing plate 27 drives the positioning rod 21 to move downwards under the action of the sealing plate connecting rod 28, the sealing plate 27 moves downwards to finish the adsorption action, the grounding block 23 is released, the connecting winding wheel 19 is made to reversely wind the tightly connecting pull rope 17 under the action of the torsion spring 18, the grounding block 23 returns to the initial state relative to the electrography 10 to move upwards, and the detection operation is finished.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. The utility model provides a test pencil of self-test, includes the test pencil, its characterized in that: a measuring head sliding groove with an upward opening is formed in the test pencil, a power-on sliding block groove with an upward opening and communicated with the measuring head sliding groove is formed in the inner bottom wall of the measuring head sliding groove, a battery is fixedly arranged on the inner wall of the right side of the power-on sliding block groove, a charging socket with a rightward opening is fixedly and electrically connected to the end face of the right side of the battery, a grounding mechanism is arranged on the inner bottom wall of the power-on sliding block groove, and a push plate sliding groove with a rightward opening and a vertically symmetrical point is formed; a push plate is arranged in the push plate chute in a sliding manner, a push plate spring fixedly connected with the inner wall of the left side of the push plate chute is fixedly arranged on the end surface of the left side of the push plate, a push plate pull rope is fixedly arranged on the end surface of the left side of the push plate, a push plate fixture block chute with an upward opening is arranged on the inner bottom wall of the push plate chute, a push plate fixture block is arranged in the push plate fixture block chute in a sliding manner, a push plate fixture block spring fixedly connected with the inner bottom wall of the push plate fixture block chute is fixedly arranged on the end surface of the bottom of the push plate fixture block, a measuring head reset spring fixedly connected with the inner bottom wall of the measuring head chute is fixedly arranged on the end surface of the bottom of the measuring head, a driving rod chute runs through the inner wall of, the test fixture comprises a driving lever, a driving lever sliding groove, a clamping block spring and a clamping block spring, wherein the other end of the driving lever, far away from the pushing plate, of the pushing plate pulling rope is fixedly connected to the top end face of the driving lever, the driving lever is fixedly arranged on the top end face of the portion, located in the driving lever sliding groove, of the driving lever, the driving lever resetting spring is fixedly connected with the inner top wall of the driving lever sliding groove, a clamping block sliding groove with a leftward opening is formed in the end face of.

2. A self-testing test pencil as recited in claim 1, further comprising: permanent magnet sliding cavities which are symmetrical up and down are arranged on the inner wall of the left side of the electrified sliding block groove, a neon lamp which is positioned between the two permanent magnet sliding cavities is fixedly arranged on the inner wall of the left side of the electrified sliding block groove, a display through hole with an opening communicated with the outside to the left is arranged on the end surface of the left side of the neon lamp, an electromagnet is fixedly arranged on the end surface of the right side of the permanent magnet sliding cavity, a permanent magnet is arranged in the permanent magnet sliding cavity in a sliding manner, an electrified block is fixedly arranged in the permanent magnet, a magnet reset spring fixedly connected with the inner wall of the left side of the permanent magnet sliding cavity is fixedly arranged on the end surface of the left side of the permanent magnet, first conducting strips which are symmetrical left and right and matched with the electrified block are fixedly arranged on the top wall in the, the neon lamp upper and lower end faces are fixedly provided with neon lamp positive conducting strips which extend into the permanent magnet sliding cavity and are electrically connected with the electrifying block towards the direction far away from the neon lamp, the bottom end face of the electromagnet is electrically connected with a wire electrically connected with the negative electrode of the battery, the left end face of the electrifying slider groove is fixedly provided with a third conducting strip, the left end face of the electrifying slider groove is fixedly provided with a fourth conducting strip which is positioned at the lower side of the third conducting strip and is electrically connected with the electromagnet positive electrode at the upper side, the left end face of the electrifying slider groove is fixedly provided with a fifth conducting strip which is positioned at the lower side of the fourth conducting strip and is electrically connected with the electromagnet positive electrode at the lower side, the right end face of the electrifying slider groove is fixedly provided with a sixth conducting strip which is electrically connected with the battery positive electrode, The fourth conducting strip, the fifth conducting strip and the sixth conducting strip are matched with a power-on sliding block, a measuring head is arranged in the measuring head sliding groove in a sliding mode, and the measuring head is fixedly connected with the power-on sliding block through a measuring head connecting rod.

3. A self-testing test pencil as recited in claim 1, further comprising: the grounding mechanism comprises a grounding block sliding groove with a downward opening, which is arranged on the inner bottom wall, a connecting cavity with a downward opening is arranged on the inner top wall of the grounding block sliding groove, a trapezoidal block sliding groove with a leftward opening is arranged on the inner wall of the right side of the connecting cavity, a trapezoidal block is arranged in the trapezoidal block sliding groove in a sliding manner, a trapezoidal block electromagnetic spring fixedly connected with the inner wall of the right side of the trapezoidal block sliding groove is fixedly arranged on the right side end face of the trapezoidal block, a grounding conducting strip which is positioned on the left side of the connecting cavity and electrically connected with the third conducting strip through a circuit is fixedly arranged on the inner top wall of the grounding block sliding groove, a grounding block is arranged in the grounding block sliding groove in a sliding manner, a positioning cavity is arranged in the grounding block, a positioning fixture block sliding groove with a forward opening is arranged on the inner wall of the rear side of the positioning fixture block sliding groove in a sliding manner, and a, a hook plate pull rope is fixedly arranged on the end face of the rear side of the positioning fixture block, a positioning rod is arranged in the positioning cavity in a sliding manner, a positioning rod pull rope is fixedly arranged on the end face of the top of the positioning rod, a suction disc cavity extending downwards is arranged on the bottom wall in the positioning cavity in a penetrating manner, a suction disc matched with the suction disc cavity is fixedly arranged on the end face of the bottom of the grounding block, a sealing plate is arranged in the suction disc cavity in a sliding manner, a sealing plate reset spring fixedly connected with the top wall in the suction disc cavity is fixedly arranged on the end face of the top of the sealing plate, a sealing plate connecting rod extending into the positioning cavity and fixedly connected with the end face of the bottom of the positioning rod is fixedly connected on the end face of the top of the sealing plate, a winding wheel cavity with an upward opening is fixedly arranged on the top wall in the, the other end of the positioning rod stay cord far away from the positioning rod is fixedly wound on the positioning rod rope-pulling wheel, a connecting winding wheel positioned at the left side of the positioning rod rope-pulling wheel is fixedly arranged on the winding wheel shaft, a connecting stay cord is fixedly wound on the connecting winding wheel, a torsion spring fixedly connected with the left side inner wall of the winding wheel cavity is fixedly arranged on the left end face of the connecting winding wheel, the other end of the connecting stay cord far away from the connecting winding wheel extends into the grounding block chute to be fixedly connected with the grounding conducting strip, a hook plate chute with an upward opening is arranged on the top end face of the grounding block, a hook plate extending upwards into the connecting cavity to be abutted against the trapezoidal block is arranged in the hook plate chute in a sliding manner, the other end of the hook plate stay cord far away from the positioning fixture block is fixedly connected on the left end face of the hook plate, and a hook plate spring fixedly connected with the right side inner wall of the hook plate chute, and the bottom end face of the grounding block is fixedly provided with grounding metal sheets which are bilaterally symmetrical and are electrically connected with the grounding conducting strip through a circuit.

4. A self-testing test pencil as claimed in claim 2, wherein: the first conducting strip on the left side is electrically connected with the measuring head through a circuit, the first conducting strip on the right side is electrically connected with the fourth conducting strip through a circuit, the second conducting strip on the left side is electrically connected with the grounding conducting strip through a circuit, the second conducting strip on the right side is electrically connected with the negative electrode of the battery through a circuit, so that the first conducting strip on the left side, the neon lamp anode conducting strip, the neon lamp, the left side, the second conducting strip, the grounding conducting strip and the grounding metal sheet form a first circuit for detection, the first conducting strip on the anode and the right side of the battery, the neon lamp anode conducting strip, the neon lamp, the left side, the second conducting strip, the grounding conducting strip and the grounding metal sheet form a second circuit for self-detection of a grounding circuit, and the anode, the cathode, the fourth conducting strip, the neon lamp, the neon, A third circuit for self-checking the neon lamp is formed between the first conducting strip on the right side and the neon lamp anode conducting strip, between the neon lamp and the second conducting strip on the right side and between the neon lamp and the negative electrode of the battery, the push plate fixture block spring on the lower side is connected with the third circuit in series, the push plate fixture block spring on the upper side is connected with the second circuit in series, and the trapezoidal block electromagnetic spring is connected with the third circuit in series.

5. A self-testing test pencil as recited in claim 1, further comprising: the elasticity of the push plate spring is greater than that of the fixture block spring.