Portable intelligent megohmmeter

Abstract

A portable intelligent megohmmeter disclosed by the present invention comprises a shell, the shell comprises a bottom shell, the bottom of the bottom shell is slidably connected with a braid switch, the bottom of the braid switch is fixedly connected with a nylon braid, the bottom of the inner wall of the bottom shell is fixedly connected with a circuit board, and the top of the circuit board is fixedly connected with a safety pressing plate. The top of the circuit board is fixedly connected with a first pin seat, the top of the circuit board is fixedly connected with a second pin seat, the top of the first pin seat is inserted with a meter pen bolt, the top of the second pin seat is inserted with an electromagnet plug, the front surface of the electromagnet plug is communicated with a through hole, and the interior of the rubber-coated metal rod is fixedly connected with a metal rod core. According to the megohmmeter, the holding stability of the meter body is improved, the probability of accidents caused by falling of the megohmmeter from a high place or short circuit burning is reduced, and the safety performance of the megohmmeter in use is improved.

Description

Technical Field

[0001] The invention relates to the technical field of resistance measuring instruments, in particular to a portable intelligent megohmmeter. Background Art

[0002] The megohmmeter is mainly used to measure the resistance value of various insulating materials and the insulation resistance of transformers, motors, cables and electrical equipment. It is a commonly used and indispensable instrument in the electric power, post and telecommunications, communications, electromechanical installation and maintenance, and industrial enterprises that use electricity as industrial power or energy. During power maintenance operations, maintenance personnel are often required to carry a megohmmeter to detect whether the resistance of power equipment located at higher locations is within the normal range. In the process of detecting the resistance of high-altitude equipment, maintenance personnel often cause accidents due to improper use of the instrument, which in turn causes personal and property losses. Summary of the invention

[0003] The object of the present invention is to provide a portable intelligent megohmmeter to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a portable intelligent megohmmeter, comprising a shell, the shell comprising a bottom shell, the bottom shell being made of polymer material, a webbing switch being slidably connected to the bottom of the bottom shell, a nylon webbing being fixedly connected to the bottom of the webbing switch, a circuit board being fixedly connected to the bottom of the inner wall of the bottom shell, a safety pressure plate being fixedly connected to the top of the circuit board, a first needle seat being fixedly connected to the top of the circuit board, a second needle seat being fixedly connected to the top of the circuit board, pins being fixedly connected in the needle seat, a test lead pin being plugged into the top of the first needle seat, an electromagnet plug being plugged into the top of the second needle seat, a through hole being connected to the front of the electromagnet plug, a rubber-covered metal rod being slidably connected to the electromagnet plug through the through hole, the rubber-covered metal rod being slidably connected to the test lead pin, providing a fixing solution for a user to stably hold the megohmmeter and a protection solution for preventing the megohmmeter from short circuit.

[0005] Preferably, a threaded column is fixedly connected to the bottom of the inner wall of the bottom shell, and the thread is located inside the threaded column. The circuit board is fixedly connected to the top of the threaded column by bolts. A buckle is fixedly connected to the bottom of the inner wall of the bottom shell. The number of the threaded column and the buckle are four, which are evenly distributed at the four corners of the bottom of the inner wall of the bottom shell. A pen clip is fixedly connected to the bottom of the bottom shell, and the pen clip includes a jacket. The jacket is made of polymer material. The top of the jacket is fixedly connected to the bottom of the bottom shell. The cross-sections of the front and back of the jacket are M-shaped. The bottom of the jacket is two inverted grooves. The top of the jacket groove is fixedly connected to a magnetic strip. The number of the magnetic strips is two, which are respectively located at the top of the two inverted grooves of the jacket. The top of the jacket is fixedly connected to a probe sheath, the back of the probe sheath is fixedly connected to a circular blind hole, the number of the circular blind holes is two, and they are symmetrically distributed about the center plane of the two side surfaces of the probe sheath, the top of the bottom shell is clamped with a top shell by a buckle, the top shell is made of polymer material, the outer edges of the top shell and the bottom shell are rounded, and sealant is filled between the top shell and the bottom shell, the top of the top shell is fixedly connected to a cover groove, the inside of the cover groove is slidably connected to a sliding cover, and the sliding cover can slide in both directions, providing an overall solution for the megohmmeter body, the polymer material body is light and strong, has certain vibration resistance and waterproofness, and is convenient for users to carry and use in harsh environments.

[0006] Preferably, the bottom of the bottom shell is fixedly connected with a safety holding mechanism, and the safety holding mechanism includes a webbing switch, and the webbing switch includes a hook-shaped plate, and the cross-sections on both sides of the hook-shaped plate are hook-shaped, and one side of the hook tip part of the hook-shaped plate is fixedly connected with a limiting block, and one side of the limit block hook handle is fixedly connected with a slide plate, and the bottom of the inner wall of the bottom shell is fixedly connected with a sliding rod, and the shape of the slide rod is cylindrical, and the bottom of the bottom shell is connected with a rectangular through hole, and the surface of the sliding rod is slidably connected to the slide plate through the rectangular through hole, and the bottom of the slide plate is fixedly connected with a spring, and the top of the sliding rod is fixedly connected with a top plate, and the limiting block, the slide plate, the top plate, the sliding rod and the bottom fixed with the sliding rod The number of fixedly connected springs is two, and they are symmetrically distributed about the center plane of the two side surfaces of the hook-shaped plate. The bottom of the hook tip part of the hook-shaped plate is fixedly connected to a conductive plate, and the material of the conductive plate is copper. The bottom of the hook handle part of the hook-shaped plate is fixedly connected to a webbing ring, and the front of the webbing ring is connected to a rectangular through hole. The top of the circuit board is fixedly connected to a protective cover, and the interior of the protective cover is a hollow structure. The top of the protective cover is connected to a rectangular through hole, and the circuit board at the bottom of the protective cover is connected to a rectangular through hole. The limit block is slidably connected to one side of the inner wall of the protective cover, providing an overall solution for the trigger mechanism of the webbing switch holding mechanism to ensure that the switch is triggered to activate the device when the webbing is used.

[0007] Preferably, the nylon webbing is fixedly connected to the webbing ring through a rectangular through hole on the front side of the webbing ring, the bottom of the bottom shell is fixedly connected to a webbing ring, the front side of the webbing ring is fixedly connected to a rectangular through hole, the nylon webbing is slidably connected to the front side of the webbing ring, the nylon webbing is flexible and can be bent after passing through the front side of the webbing ring, the bottom of the part of the nylon webbing that does not pass through the webbing ring is fixedly connected with a Velcro thorn surface, the bottom of the part of the nylon webbing that passes through the webbing ring is fixedly connected with a Velcro hair surface, both the Velcro thorn surface and the Velcro hair surface are flexible and can be bent together with the nylon webbing, the Velcro hair surface can be adhered to the Velcro thorn surface for stable fixation, and when adjustment is needed, the nylon webbing is pulled to drive the Velcro hair surface to separate from the Velcro thorn surface, and the position is readjusted and then adhered again, and the nylon webbing can also be used to mount the watch body to a position that is easy to carry when the megohmmeter is carried and moved, thereby providing a webbing fixing and triggering scheme for a safe holding mechanism, adapting to users with different hand shapes, and providing another fixing scheme for carrying the megohmmeter.

[0008] Preferably, the safety pressure plate includes a push rod sleeve, the push rod sleeve is made of polymer, one side of the push rod sleeve is connected with a circular through hole, the other side of the push rod sleeve is connected with a rectangular through hole, the top of the push rod sleeve is connected with a rectangular through hole, the top of the push rod sleeve is connected with a conducting bent rod through the through hole, the outside of the conducting bent rod is polymer, the inside of the conducting bent rod is a metal conductor, the cross-sections of both sides of the conducting bent rod are N-shaped, one side of the conducting bent rod is connected with a circular through hole, the bottom of the conducting bent rod is electrically connected to the circuit board, one side of the push rod sleeve is slidably connected with a metal plug rod, the other end of the metal plug rod is fixedly connected with a polymer push rod, one end of the polymer push rod is fixedly connected with a spring, the metal plug rod is slidably connected to the spring, and the cross-sectional circular diameter of the polymer push rod is larger than the cross-sectional diameter of the metal plug rod The diameter of a circle, the polymer push rod is slidably connected to the push rod sleeve, the other end of the polymer push rod is fixedly connected to a transfer column, the other end of the transfer column is fixedly connected to a pressing plate, the pressing plate is made of polymer, the transfer column is slidably connected to the other end of the top shell, a baffle is fixedly connected to one side of the bottom shell, the cross-sections of the front and back of the baffle are inverted C-shape, the pressing plate is slidably connected to the baffle, the other side of the pressing plate is fixedly connected to a reset spring, and the other side of the reset spring is fixedly connected to the top shell, the number of the pressing plate, baffle, transfer column, polymer push rod, metal plug rod and reset spring are all two, and they are symmetrically distributed about the center plane of the two side surfaces of the bottom shell, providing a press trigger scheme for the safe holding mechanism to ensure that the user can only start and use the megohmmeter on the premise of firmly holding the watch body.

[0009] Preferably, a copper pillar is fixedly connected to the top of the circuit board, and the number of the copper pillars is eight, with four in a group, and a total of two groups. A screen circuit board is provided on the top of one group of copper pillars, and a screen is fixedly connected to the top of the screen circuit board, and the screen circuit board is electrically connected to the screen, and the front of the screen is electrically connected to the top of the circuit board through a flat cable. A button circuit board is fixedly connected to the top of the other group of copper pillars, and a button assembly is fixedly connected to the top of the button circuit board. There are three button assemblies evenly distributed on the top of the button assembly, and the button assembly is electrically connected to the button circuit board, and the button circuit board is electrically connected to the button assembly through a flat cable. A button cover is fixedly connected to the top of the button assembly, and the material of the button cover is polymer. The button cover is slidably connected to the top of the top shell, and there are three button covers. A buzzer is fixedly connected to the top of the circuit board The buzzer is electrically connected to the circuit board, a battery compartment base is fixedly connected to the top of the circuit board, a battery compartment card is fixedly connected to the top of the battery compartment base, there are two battery compartment card boards, which are symmetrically distributed about the center plane of the two side surfaces of the battery compartment base, a negative electrode sheet is fixedly connected to one side of the battery compartment card board, a compression spring is welded at the center of one side of the negative electrode sheet, which is used to compact and fix the battery and stabilize the contact between the negative electrode sheet and the negative electrode of the battery, a battery is fixedly connected to one side of the negative electrode sheet, and the battery is electrically connected to the battery compartment base through the negative electrode sheet, the battery compartment base is electrically connected to the circuit board, a chipset is fixedly connected to the top of the circuit board, which is used to read the input current value, calculate the resistance of the device under test and control the working status of other mechanisms of the circuit board, and the chipset is electrically connected to the circuit board through pins, providing a connection solution for the mechanism inside the circuit board.

[0010] Preferably, the front of the test lead plug is connected to a circular through hole, the number of the circular through holes is two, the diameter of the circular through holes is consistent with the diameter of the through hole of the electromagnet plug, one of the circular through holes is close to the top surface and one side surface of the test lead plug, and the other is close to the bottom surface and the other side surface of the test lead plug. The back of the test lead plug is connected to a sleeve for connecting the top shell and the test lead plug and protecting the terminal of the test lead. The back of the sleeve is connected to the back of the top shell, and a copper sleeve is fixedly connected to the inside of the sleeve for contacting the terminal to conduct current. The copper sleeve is fixedly connected to the inner wall of the through hole of the test lead plug. The number of the sleeve and the copper sleeve are both two. The test lead plug is connected to the circuit board through the pins of the base, and the copper sleeve is electrically connected to the test lead plug through the metal sheet. The chipset is electrically connected to the conduction bending rod, the battery, the screen, the button assembly, the buzzer, the test lead plug, and the electromagnet plug through the circuit board. Technical solutions for the connection part between the meter body and the test lead and technical solutions for the connection method of the chipset and other mechanisms on the circuit board are provided.

[0011] Preferably, a coil is fixedly connected inside the through hole of the electromagnet plug, and the coil is electrically connected to the circuit board through the electromagnet plug, and is used to generate electromagnetic force to drive the rubber-covered metal rod to move when power is turned on. A spring is fixedly connected to the front of the electromagnet plug, and the rubber-covered metal rod is slidably connected to the spring, and a rod cover is fixedly connected to the front of the rubber-covered metal rod. A metal rod core is fixedly connected inside the rubber-covered metal rod to induce electromagnetic force and thereby drive the rubber-covered metal rod to move. The cross-sectional circular diameter of the rubber-covered metal rod is consistent with the diameter of the through hole of the copper sleeve, and a limit plate is fixedly connected to one side of the inner wall of the top shell, and the limit plate is located on the front of the rod cover. The center plane of the top and bottom of the limit plate coincides with the center plane of the rod cover, and a triangular reinforcing rib is fixedly connected to the front of the limit plate, which provides a technical solution for a short-circuit protection structure, and the measuring circuit is disconnected by popping out the test lead when a short circuit occurs, thereby protecting the meter body and the user.

[0012] Preferably, the copper sleeve is slidably connected to the test lead, the test lead includes a terminal, the terminal is made of copper, the terminal is a hollow structure, the outer diameter of the terminal is consistent with the inner diameter of the copper sleeve, the terminal surface is slidably connected to the inner wall of the copper sleeve, the distance from the front to the back of the terminal is consistent with the distance from the back of the test lead pin to the back of the top shell, the terminal is electrically connected to the copper sleeve, a plug is fixedly connected to the back of the terminal, the bottom of the plug is fixedly connected to the pen body through a wire, the outside of the pen body is made of polymer material, a metal sheet is fixedly connected to the top of the pen body for cooperating with the magnetic strip on the pen clip to achieve magnetic fixation, the number of the metal sheets is two, which are respectively located at the top and bottom of the metal sheet, a probe is fixedly connected to the front of the metal sheet, the probe is electrically connected to the pen body, the number of the test leads is two, the inside of the pen body is electrically connected to the plug through a wire, and the plug is electrically connected to the terminal, an overall solution for the test lead and a magnetic fixation solution for the test lead and the meter body are provided, which facilitates the user to take the test lead while ensuring the stability of the fixation of the test lead.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The portable intelligent megohmmeter uses a nylon webbing fixed to the meter body to fix the meter body to the palm of the user, thereby improving the stability of the user holding the meter body and reducing the possibility of accidents caused by the meter body falling off. The nylon webbing and the webbing switch are used together to enable the megohmmeter only when the user passes the palm through the gap between the nylon webbing and the meter body to hold the meter body, thereby improving the stability of the megohmmeter when being held, reducing the probability of safety accidents caused by the megohmmeter falling from a high place, and improving the safety of the megohmmeter in use. The portable intelligent megohmmeter uses safety pressure plate switches on both sides. When the user firmly holds one of the switches on one side or both switches on both sides, the megohmmeter can work only after the webbing switch and at least one safety pressure plate switch are activated, so as to adapt to the operation of users with different palm sizes, improve the human-machine efficiency, and promote the user to firmly hold the meter body. When the megohmmeter falls off due to accident, the megohmmeter will also stop working, so as to prevent the person from accidentally connecting the test lead of the megohmmeter to cause electric shock or the test lead from accidentally connecting to other equipment to cause equipment damage, thereby improving the safety of using the megohmmeter; The portable intelligent megohmmeter uses a magnetic strip and a metal sheet to store the test leads, thereby improving the portability of the megohmmeter, facilitating the storage of the test leads while preventing the test leads from falling off, thereby preventing possible accidents. The anti-short circuit push rod group controlled by a chipset detects that the measured resistance value is 0 due to a long-term short circuit of the test leads or damage to the measured device. To prevent the megohmmeter from burning and other accidents caused by the long-term resistance value being 0, the chipset activates an electromagnet to drive the push rod to pop out the test lead terminal, thereby popping out the test lead, forcibly disconnecting the megohmmeter measurement circuit, thereby reducing the probability of the megohmmeter burning due to a short circuit, and visually reminding the user of abnormal conditions, thereby improving the safety of the megohmmeter. The portable intelligent megohmmeter utilizes a buzzer controlled by a single-chip microcomputer and cooperates with an anti-short-circuit electromagnetic push rod. When the chipset detects that the resistance value measured for more than 2 seconds is 0, it is judged that the test lead is short-circuited for a long time or the insulation of the device under test fails. When the chipset starts the electromagnetic push rod to pop out the test lead connection, the buzzer starts to emit a prompt sound, which reminds the user of the abnormal situation at the auditory level, thereby further improving the safety of the megohmmeter. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the overall structure of the top of the present invention; Figure 2 This is a schematic diagram of the overall structure of the bottom of the present invention; Figure 3 This is a schematic diagram of the internal structure of the bottom shell of the present invention; Figure 4 It is a schematic diagram of the overall structure of the circuit board of the present invention; Figure 5 It is a schematic diagram of the positional relationship between the circuit board, the screen assembly and the button assembly of the present invention; Figure 6 This is a schematic diagram of the overall structure of the pen clip of the present invention; Figure 7 This is a schematic diagram of the positional relationship between the nylon webbing hook and loop fastener surface and the nylon webbing of the present invention; Figure 8 This is a schematic diagram of the overall structure of the test lead of the present invention; Fig. 9This is a schematic diagram of the positional relationship between the button cover and the button assembly of the present invention; Fig.10 It is a schematic diagram of the overall structure of the webbing switch inside the bottom shell of the present invention; Fig.11 It is a schematic diagram of the cross-sectional structure of the hook-shaped plate of the present invention; Fig.12 A schematic diagram of the positional relationship between the hook plate and the protective cover of the present invention; Fig.13 A schematic diagram of the positional relationship between the polymer ejector rod and the ejector rod sleeve of the present invention; Fig.14 It is a schematic diagram of the positional relationship between the pressing plate and the return spring of the present invention; Fig.15 This is a schematic diagram of the overall structure of the safety pressure plate of the present invention; Fig.16 This is a schematic diagram of the positional relationship between the rubber-covered metal rod and the terminal of the present invention; Fig.17 It is a schematic diagram of the overall structure of the anti-short circuit push rod of the present invention.

[0015] In the figure: 1. Shell; 11. Bottom shell; 111. Threaded column; 112. Buckle; 12. Top shell; 121. Cover groove; 122. Slide cover; 123. Button cover; 13. Test lead; 131. Terminal; 132. Plug; 133. Pen body; 134. Metal sheet; 135. Probe; 14. Pen clip; 141. Jacket; 142. Magnetic strip; 143. Probe cover; 2. Safety grip mechanism; 21. Nylon webbing; 211. Velcro thorn surface; 212. Velcro fleece surface; 22. Webbing switch; 221. Hook plate; 222. Limit block; 223. Conductive plate; 224. Slide plate; 225. Top plate; 226. Slide bar; 227. Webbing ring; 228. Cover; 23. Safety pressure plate; 231. 1. Press plate; 232. Baffle; 233. Adapter column; 234. Polymer ejector pin; 235. Metal plug pin; 236. Return spring; 237. Ejector pin sleeve; 238. Conductive bent rod; 24. Belt threading ring; 3. Circuit board; 31. Chip set; 32. Battery compartment base; 321. Battery compartment card plate; 322. Negative electrode sheet; 323. Battery; 33. Copper column; 34. Screen circuit board; 341. Screen; 35. Button circuit board; 351. Button assembly; 36. Buzzer; 37. First needle holder; 38. Second needle holder; 39. Test lead pin; 391. Sleeve; 392. Copper sleeve; 4. Electromagnet plug; 41. Rubber-covered metal rod; 411. Metal rod core; 42. Rod cover; 43. Limit plate. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] See also Figure 1-17 The present invention provides a technical solution: a portable intelligent megohmmeter includes a shell 1, the shell 1 is made of polymer material, the shell 1 is the outer shell of the megohmmeter, the polymer material is light and durable, has certain vibration resistance and waterproofness, and is convenient for users to carry, the shell 1 includes a bottom shell 11, which is used to carry and protect other structures of the megohmmeter, a threaded column 111 is fixedly connected to the bottom of the inner wall of the bottom shell 11, which is used to connect the bottom shell 11 and a circuit board 3, the circuit board 3 is fixedly connected to the bottom of the inner wall of the bottom shell 11, which is used to carry and connect electronic components, the circuit board 3 is fixedly connected to the top of the threaded column 111 by bolts, and a buckle 112 is fixedly connected to the bottom of the inner wall of the bottom shell 11, which is used to fix the bottom shell 11 and the top shell 12, the number of the threaded column 111 and the buckle 112 are both four, which are evenly distributed at the four corners of the bottom of the inner wall of the bottom shell 11, the bottom of the bottom shell 11 is fixedly connected to a pen clip 14, which is used to fix the test pen 13, the pen clip 14 includes a jacket 141, the top of the jacket 141 is fixedly connected to the bottom of the bottom shell 11, and the front of the jacket 141 is fixedly connected to the bottom of the bottom shell 11. The cross section of the back is M-shaped. The bottom of the jacket 141 is two inverted grooves, which are used to store the pen body 133 of the test lead 13. The top of the inverted groove of the jacket 141 is fixedly connected with a magnetic strip 142, which is used to fix the pen body 133 by magnetically adsorbing the metal sheet 134 fixed to the pen body 133. There are two magnetic strips 142, which are respectively located at the top of the two inverted grooves of the jacket 141. The top of the jacket 141 is fixedly connected with a probe sheath 143, and the back of the probe sheath 143 is fixedly connected with a circular Blind holes are used to accommodate and protect the probe 135. There are two circular blind holes, which are symmetrically distributed about the central plane of the two side surfaces of the probe sheath 143. The top of the bottom shell 11 is clamped with the top shell 12 through the buckle 112, which is used to fix the screen 341 and the buzzer 36 and protect the mechanism inside the megohmmeter from the top. The top of the top shell 12 is fixedly connected with a cover groove 121, and a sliding cover 122 is slidably connected inside the cover groove 121. The sliding cover 122 can slide along both sides in the cover groove 121 to protect the battery 323. The bottom of the bottom shell 11 is fixedly connected with a safety holding mechanism 2. The safety holding mechanism 2 controls the working state of the megohmmeter by setting a switch device at a key position of the megohmmeter body. Only when the megohmmeter is firmly held so that all the switch devices at the key positions are triggered, the megohmmeter can enter the working state. In this way, the user can firmly hold the megohmmeter and reduce the probability of accidents caused by the megohmmeter slipping. The safety holding mechanism 2 includes a webbing switch 22. The bottom of the bottom shell 11 is slidably connected with the webbing switch 22 for connecting the power. Road plate 3, the webbing switch 22 includes a hook plate 221, which is used to realize the up and down sliding of the webbing switch 22. The cross-sections on both sides of the hook plate 221 are hook-shaped. One side of the hook tip of the hook plate 221 is fixedly connected to a limit block 222, which is used to limit the sliding range of the webbing switch 22. One side of the hook handle of the limit block 222 is fixedly connected to a slide plate 224, which is used to drive the webbing switch 22 to slide and limit its sliding direction. The bottom of the inner wall of the bottom shell 11 is fixedly connected to a slide bar 226, which is used to cooperate with the slide plate 224 to limit the movement direction of the webbing switch 22. The surface of the slide bar 226 is slidably connected to the slide plate 224, the bottom of the slide plate 224 is fixedly connected to a spring, and the top of the slide bar 226 is fixedly connected to a top plate 225 for limiting the sliding range of the slide plate 224. The number of the limit block 222, the slide plate 224, the top plate 225, the slide bar 226 and the spring fixedly connected to the bottom of the slide bar 226 are two, and are symmetrically distributed about the central plane of the two side surfaces of the hook plate 221. The bottom of the hook tip of the hook plate 221 is fixedly connected to a conductive plate 223 for connecting the circuit inside the circuit board 3. The bottom of the hook handle of the hook-shaped plate 221 is fixedly connected with a webbing ring 227 for providing a fixing point for the nylon webbing 21. The front of the webbing ring 227 is connected with a rectangular through hole. The top of the circuit board 3 is fixedly connected with a protective cover 228 for protecting the conductive plate 223 and cooperating with the slide plate 224 to limit the movement direction of the webbing switch 22. The inside of the protective cover 228 is a hollow structure. The top of the protective cover 228 is connected with a rectangular through hole. The circuit board 3 at the bottom of the protective cover 228 is connected with a rectangular through hole. The limit block 222 is slidably connected to one side of the inner wall of the protective cover 228. The bottom of the webbing switch 22 is fixedly connected with a nylon webbing 21, which is used to fit the palm of the user and increase the pressure between the palm of the user and the bottom of the bottom shell 11 to increase the stability of the megohmmeter. The nylon webbing 21 is fixedly connected to the webbing ring 227 through the rectangular through hole on the front of the webbing ring 227. The bottom of the bottom shell 11 is fixedly connected with a belt ring 24, which is used to provide a fixing point for the nylon webbing 21. The front of the belt ring 24 is fixedly connected with a rectangular through hole. The nylon webbing 21 is slidably connected to the front of the belt ring 24. The nylon webbing 21 is flexible and has high strength. It can be inserted through the front of the belt ring 24. After bending, the bottom of the part of the nylon webbing 21 that does not pass through the belt loop 24 is fixedly connected with a Velcro thorn surface 211, and the bottom of the part of the nylon webbing 21 that passes through the belt loop 24 is fixedly connected with a Velcro fleece surface 212. Both the Velcro thorn surface 211 and the Velcro fleece surface 212 are flexible and can be bent together with the nylon webbing 21. The Velcro thorn surface 211 and the Velcro fleece surface 212 cooperate and adhere to further improve the stability of the nylon webbing 21 for the user to hold the watch body, and the nylon webbing 21 can be adjusted to adapt to the palm sizes of different users, thereby improving the human-machine efficiency; A safety pressure plate 23 is fixedly connected to the top of the circuit board 3, which is used to start the megohmmeter together with the webbing switch 22. The safety pressure plate 23 includes a top rod sleeve 237 for stabilizing the top rod. A circular through hole is connected to one side of the top rod sleeve 237, and a rectangular through hole is connected to the other side of the top rod sleeve 237. The top of the top rod sleeve 237 is connected to a rectangular through hole. A conductive bent rod 238 is inserted into the top of the top rod sleeve 237 through the through hole. The conductive bent rod 238 is used to cooperate with the webbing switch 22 to control the conduction state of the circuit. The cross-sections of the two sides of the conductive bent rod 238 are N-shaped. The outside of the conductive bent rod 238 is a polymer, and the inside of the conductive bent rod 238 is a metal conductor. A circular through hole is connected to one side of the rod 238, and the bottom of the conductive bent rod 238 is electrically connected to the circuit board 3. A metal plug rod 235 is slidably connected to one side of the ejector sleeve 237 for cooperating with the conductive bent rod 238 to connect the circuit. A polymer ejector 234 is fixedly connected to the other end of the metal ejector 235 for driving the metal ejector 235 to move. A spring is fixedly connected to one end of the polymer ejector 234 for assisting the polymer ejector 234 in resetting. The metal ejector 235 is slidably connected to the spring. The cross-sectional circular diameter of the polymer ejector 234 is larger than the cross-sectional circular diameter of the metal ejector 235. The polymer ejector 234 is slidably connected to the ejector sleeve 237. The other end of the polymer push rod 234 is fixedly connected with a transfer column 233 for connecting the polymer push rod 234 and the pressing plate 231. The other end of the transfer column 233 is fixedly connected with a pressing plate 231. The pressing plate 231 is used for the user to press and drive the metal plug rod 235 to move. The transfer column 233 is slidably connected to the other end of the top shell 12. A baffle 232 is fixedly connected to one side of the bottom shell 11 for limiting the displacement direction and displacement distance of the pressing plate 231. The cross-sections of the front and back of the baffle 232 are reverse C-shaped. The pressing plate 231 is slidably connected to the baffle 232. The other side of the pressing plate 231 is fixedly connected with a reset plate The spring 236 is used to assist the pressing plate 231 to reset after being pressed. The other side of the reset spring 236 is fixedly connected to the top shell 12. The pressing plate 231, the baffle 232, the adapter column 233, the polymer top rod 234, the metal plug rod 235, and the reset spring 236 are all two in number and are symmetrically distributed about the central plane of the two side surfaces of the bottom shell 11. The pressing plate 231 is triggered by pressing the inside of the user's palm to complete the metal plug rod 235 to insert into the through hole of the conductive bent rod 238 to complete the connection, and then cooperate with the ribbon switch 22 to complete the start of the megohmmeter, so that the user can hold the megohmmeter firmly and reduce the probability of the megohmmeter accidentally falling off; The top of the circuit board 3 is fixedly connected with a copper column 33 for fixing other components. The number of copper columns 33 is eight, and each group of four is two groups. The top of one group of copper columns 33 has a screen circuit board 34 for carrying a screen 341. The top of the screen circuit board 34 is fixedly connected with a screen 341 for displaying measured values. The screen circuit board 34 is electrically connected to the screen 341. The front of the screen 341 is electrically connected to the top of the circuit board 3 through a flat cable. The top of the other group of copper columns 33 is fixedly connected with a button circuit board 35 for carrying a button component 351. The top of the button circuit board 35 is fixedly connected with a button component 351. A button assembly 351 is connected to cooperate with the chipset 31 to control the megohmmeter. There are three button assemblies 351, which are evenly distributed on the top of the button assembly 351. The button assembly 351 is electrically connected to the button circuit board 35. The button circuit board 35 is electrically connected to the button assembly 351 through a flat cable. A button cover 123 is fixedly connected to the top of the button assembly 351 to display the button function, facilitate user operation and protect the button assembly 351. The button cover 123 is slidably connected to the top of the top shell 12. There are three button covers 123. A buzzer 36 is fixedly connected to the top of the circuit board 3 , used to issue a prompt sound under the control of the chipset 31 to remind the user auditorily, the buzzer 36 is electrically connected to the circuit board 3, the top of the circuit board 3 is fixedly connected to a battery compartment base 32 for powering the megohmmeter, the top of the battery compartment base 32 is fixedly connected to a battery compartment card plate 321 for fixing a battery 323, the number of battery compartment card plates 321 is two, and they are symmetrically distributed about the center plane of the two side surfaces of the battery compartment base 32, one side of the battery compartment card plate 321 is fixedly connected to a negative electrode sheet 322, and a compression spring is welded at the center of one side of the negative electrode sheet 322 for contacting the negative electrode of the battery 323, A battery 323 is fixedly connected to one side of the negative electrode sheet 322, which is used to electrically connect the battery 323 to the battery compartment base 32 through the negative electrode sheet 322, and the battery compartment base 32 is electrically connected to the circuit board 3. A chipset 31 is fixedly connected to the top of the circuit board 3, which is used to detect and control the electronic components on the circuit board 3 and complete the calculation of the device resistance. The chipset 31 is electrically connected to the circuit board 3 through pins, and a first needle seat 37 is fixedly connected to the top of the circuit board 3. A second needle seat 38 is fixedly connected to the top of the circuit board 3, which is used to complete the fixed connection with the test lead pin 39 and the electromagnet plug 4; A test lead plug 39 is plugged into the top of the first needle holder 37 for electrically connecting the circuit board 3 and the test lead 13. The front of the test lead plug 39 is connected to a circular through hole. There are two circular through holes. The diameter of the circular through holes is consistent with the diameter of the through hole of the electromagnet plug 4. One of the circular through holes is close to the top surface and one side surface of the test lead plug 39, and the other is close to the bottom surface and the other side surface of the test lead plug 39. The back of the test lead plug 39 is connected to a sleeve 391 for protecting a copper sleeve 392. The back of the sleeve 391 is connected to the back of the top shell 12. The copper sleeve 392 is fixedly connected inside the sleeve 391 for assisting the test lead. 13 is connected with the circuit board 3, and the wear of the terminal 131 of the test lead 13 is reduced. The copper sleeve 392 is fixedly connected to the inner wall of the through hole of the test lead plug 39. The number of the sleeve 391 and the copper sleeve 392 are both two. The test lead plug 39 is connected with the circuit board 3 through the pins of the base. The copper sleeve 392 is electrically connected to the test lead plug 39 through the metal sheet. The chipset 31 is electrically connected to the conductive bending rod 238, the battery 323, the screen 341, the button assembly 351, the buzzer 36, the test lead plug 39, and the electromagnet plug 4 through the circuit board 3, so as to realize the control of the components of the circuit board 3 by the chipset 31; The copper sleeve 392 is slidably connected to the test lead 13, and the test lead 13 is used to connect the megohmmeter to the device under test. The test lead 13 includes a terminal 131, which is used to connect the test lead 13 to the megohmmeter body. The terminal 131 is a hollow structure. The outer diameter of the terminal 131 is consistent with the inner diameter of the copper sleeve 392. The surface of the terminal 131 is slidably connected to the inner wall of the copper sleeve 392. The distance from the front to the back of the terminal 131 is consistent with the distance from the back of the test lead pin 39 to the back of the top shell 12. The terminal 131 is electrically connected to the copper sleeve 392. The back of the terminal 131 is fixedly connected to a plug 132, and the bottom of the plug 132 is fixedly connected to a pen body 133 through a wire for use. The holder provides a holding space, which is convenient for the user to place the test lead 13 at the position to be tested. A metal sheet 134 is fixedly connected to the top of the pen body 133, which is used to cooperate with the magnetic strip 142 to complete the fixed storage of the test lead 13. There are two metal sheets 134, which are respectively located at the top and bottom of the metal sheet 134. A probe 135 is fixedly connected to the front of the metal sheet 134, which is used to contact the device under test for auxiliary measurement. The probe 135 is electrically connected to the pen body 133, and the pen body 133 is electrically connected to the plug 132 through a wire. The plug 132 is electrically connected to the terminal 131. There are two test leads 13, so that the positive and negative poles are connected to the device under test; An electromagnet plug 4 is plugged into the top of the second needle seat 38, and a through hole is connected to the front of the electromagnet plug 4. A rubber-coated metal rod 41 is slidably connected to the electromagnet plug 4 through the through hole. The rubber-coated metal rod 41 is covered with a rubber layer to reduce wear and insulation. The rubber-coated metal rod 41 is slidably connected to the test lead plug 39. A coil is fixedly connected inside the through hole of the electromagnet plug 4 to generate electromagnetic force when power is turned on. The coil is electrically connected to the circuit board 3 through the electromagnet plug 4. A spring is fixedly connected to the front of the electromagnet plug 4 to assist in resetting the rubber-coated metal rod 41 when the movement ends. The rubber-coated metal rod 41 is slidably connected to the spring. A rod cover 42 is fixedly connected to the front of the rubber-coated metal rod 41 to contact the spring and drive the rubber-coated metal rod 41 when resetting. A metal rod core 411 is fixedly connected inside the rubber-coated metal rod 41 for inducing electromagnetic force and driving the rubber-coated metal rod 41 to move. The cross-sectional diameter of the rubber-coated metal rod 41 is consistent with the diameter of the through hole of the copper sleeve 392. A limit plate 43 is fixedly connected to one side of the inner wall of the top shell 12 for limiting the displacement range of the rubber-coated metal rod 41. The limit plate 43 is located on the front of the rod cover 42. The center planes of the top and bottom of the limit plate 43 coincide with the center plane of the rod cover 42. A triangular reinforcing rib is fixedly connected to the front of the limit plate 43 for improving the structural strength of the limit plate 43. The push rod group controlled by the chipset 31 pops out the test lead when a short circuit occurs, forcing the megohmmeter measurement circuit to be disconnected, thereby protecting the megohmmeter from burning, and further protecting the user and other electrical equipment.

[0018] Working principle: Before the user picks up the megohmmeter for measurement, the user first passes the four fingers except the thumb through the gap between the nylon webbing 21 and the bottom of the bottom shell 11 until the palm of the hand and the bottom of the four fingers fit with the bottom of the bottom shell 11. At this time, pinch the free end of the nylon webbing 21 and adjust the position of the nylon webbing 21 until the nylon webbing 21 can press the back of the hand without squeezing the hand, and the webbing ring 227 drives the webbing switch 22 to move downward. At this time, move the free end of the nylon webbing 21 until the Velcro thorn surface 211 and the Velcro fur surface 212 adhere to each other. At this time, press the inner side of the thumb against the top of the top shell 12. The palm on one side of the thumb will trigger the safety pressure plate 23 on one side under the drive of the thumb. If the user's palm is longer, the four fingers can be bent at the same time, thereby triggering the safety pressure plate 23 on the other side at the same time. At this time, the safety gripping mechanism 2 of the megohmmeter is started, the megohmmeter circuit is connected, and it enters the working state; When the user starts the safety grip mechanism 2, when the webbing switch 22 moves downward, the hook plate 221 drives the limit block 222, the conductive plate 223, and the slide plate 224 to move downward together, and the slide plate 224 moves downward along the slide bar 226 while squeezing the spring until the conductive plate 223 is plugged into the rectangular through hole of the circuit board 3 directly below, and the conductive plate 223 is partially connected; When the user starts the safety grip mechanism 2, the palm of the thumb squeezes the pressing plate 231 of the safety pressure plate 23 on one side, and the pressing plate 231 squeezes the return spring 236, and at the same time drives the adapter column 233, the polymer push rod 234, and the metal plug rod 235 to move to the opposite side. The polymer push rod 234 squeezes the spring while moving. When the metal plug rod 235 moves to the inside of the circular through hole of the conductive bent rod 238, the metal conductor inside the conductive bent rod 238 is connected, and the safety on the other side is released. The triggering process of the pressure plate 23 is similar. At this time, the safety holding mechanism 2 is completely triggered, the circuit board 3 is fully connected, the megohmmeter is started, and the chipset 31 transmits a signal to the screen 341 after power-on. The surface of the screen 341 displays the operation information. At this time, the pen body 133 of the test lead 13 is removed, and the probe 135 is brought into contact with the two ends of the device under test. The battery 323 forms a measurement loop with the chipset 31 and the device under test for measurement. After measuring the loop current value, the chipset 31 displays the calculated resistance value of the device under test on the screen. When the probes 135 of the two test leads 13 are accidentally short-circuited or connected to the same conductor without resistance, and the measured resistance is 0 for more than two seconds, the chipset 31 determines that a short circuit occurs in the measurement circuit, and transmits a control signal to the electromagnet plug 4 through the circuit of the circuit board 3. The coil in the electromagnet plug 4 is energized to generate electromagnetic force, driving the rubber-covered metal rod 41 to move backward, and at the same time, the rod cover 42 squeezes the spring to push the terminal 131 of the test lead 13 out of the copper sleeve 392. At the same time, the chipset 31 transmits a signal to the buzzer 36, and the buzzer 36 emits a prompt sound to remind the user to check the situation. After the terminal 131 is pushed out and the measurement circuit is disconnected, the buzzer 36 stops working, the coil in the electromagnet plug 4 is powered off, and the rod cover 42 is pushed under the action of the spring elastic force to drive the rubber-covered metal rod 41 to reset, completing the short circuit protection; When the measurement is completed, the probe 135 is taken out and the pen body 133 is put back into the pen clip 14. When the metal sheet 134 on the pen body 133 contacts the magnetic strip 142, the adsorption and fixation are completed. The user extends the palm from the nylon webbing 21. The webbing switch 22 pushes the slide plate 224 to move upward under the action of the spring. The slide plate 224 drives the hook plate 221 to move upward. The hook plate 221 drives the conductive plate 223 to move upward. Part of the circuit of the conductive plate 223 is disconnected, the megohmmeter is turned off, the webbing switch 22 is reset, and at the same time, the polymer push rod 234 moves in the opposite direction under the action of the spring elastic force. The polymer push rod 234 drives the metal plug rod 235 to leave the conductive bent rod 238, and the conductive bent rod 238 is powered off. At the same time, the reset spring 236 pushes the pressing plate 231 to move in the opposite direction. The safety pressing plate 23 is reset, and the safety holding mechanism 2 is completely closed.

[0019] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A portable intelligent megohmmeter, comprising a housing (1), characterized in that: The housing (1) comprises a bottom shell (11), the bottom of the bottom shell (11) is slidably connected to a webbing switch (22), the bottom of the webbing switch (22) is fixedly connected to a nylon webbing (21), the bottom of the inner wall of the bottom shell (11) is fixedly connected to a circuit board (3), the top of the circuit board (3) is fixedly connected to a safety pressure plate (23), the top of the circuit board (3) is fixedly connected to a first needle seat (37), the top of the circuit board (3) is fixedly connected to a second needle seat (38), the top of the first needle seat (37) is plugged with a test lead plug (39), the top of the second needle seat (38) is plugged with an electromagnet plug (4), the front of the electromagnet plug (4) is connected to a through hole, the electromagnet plug (4) is slidably connected to a rubber-coated metal rod (41) through the through hole, and the rubber-coated metal rod (41) is slidably connected to the test lead plug (39).

2. A portable intelligent megohmmeter according to claim 1, characterized in that: A threaded column (111) is fixedly connected to the bottom of the inner wall of the bottom shell (11); the circuit board (3) is fixedly connected to the top of the threaded column (111) by means of bolts; a buckle (112) is fixedly connected to the bottom of the inner wall of the bottom shell (11); the number of the threaded column (111) and the buckle (112) are both four, and they are evenly distributed at the four corners of the bottom of the inner wall of the bottom shell (11); a pen clip (14) is fixedly connected to the bottom of the bottom shell (11); the pen clip (14) comprises a clip sleeve (141); the top of the clip sleeve (141) is fixedly connected to the bottom of the bottom shell (11); the cross-sections of the front and back of the clip sleeve (141) are M-shaped; the bottom of the clip sleeve (141) is two undercuts. The top of the groove of the jacket (141) is fixedly connected to a magnetic strip (142), the number of the magnetic strips (142) is two, and they are respectively located at the tops of the two inverted grooves of the jacket (141); the top of the jacket (141) is fixedly connected to a probe sheath (143), the back of the probe sheath (143) is fixedly connected to a circular blind hole, the number of the circular blind holes is two, and they are symmetrically distributed about the center plane of the two side surfaces of the probe sheath (143); the top of the bottom shell (11) is clamped to the top shell (12) through a buckle (112), the top of the top shell (12) is fixedly connected to a cover groove (121), and the inside of the cover groove (121) is slidably connected to a sliding cover (122).

3. A portable intelligent megohmmeter according to claim 1, characterized in that: The bottom of the bottom shell (11) is fixedly connected to a safety holding mechanism (2), the safety holding mechanism (2) comprises a webbing switch (22), the webbing switch (22) comprises a hook-shaped plate (221), the cross-sections of both sides of the hook-shaped plate (221) are inverted hook-shaped, one side of the hook tip of the hook-shaped plate (221) is fixedly connected to a limit block (222), one side of the hook handle of the limit block (222) is fixedly connected to a slide plate (224), the bottom of the inner wall of the bottom shell (11) is fixedly connected to a slide bar (226), the surface of the slide bar (226) is slidably connected to the slide plate (224), the bottom of the slide plate (224) is fixedly connected to a spring, the top of the slide bar (226) is fixedly connected to a top plate (225), the limit block (222), the slide plate (224), and the top plate The number of the slide bar (225), the slide bar (226) and the spring fixedly connected to the bottom of the slide bar (226) are all two, and they are symmetrically distributed about the center plane of the two side surfaces of the hook plate (221); the bottom of the hook tip of the hook plate (221) is fixedly connected to a conductive plate (223); the bottom of the hook handle of the hook plate (221) is fixedly connected to a webbing ring (227); the front of the webbing ring (227) is connected to a rectangular through hole; the top of the circuit board (3) is fixedly connected to a protective cover (228); the inside of the protective cover (228) is a hollow structure; the top of the protective cover (228) is connected to a rectangular through hole; the circuit board (3) at the bottom of the protective cover (228) is connected to a rectangular through hole; and the limit block (222) is slidably connected to one side of the inner wall of the protective cover (228).

4. A portable intelligent megohmmeter according to claim 3, characterized in that: The nylon webbing (21) is fixedly connected to the webbing ring (227) via a rectangular through hole on the front side of the webbing ring (227); a webbing ring (24) is fixedly connected to the bottom of the bottom shell (11); a rectangular through hole is fixedly connected to the front side of the webbing ring (24); the nylon webbing (21) is slidably connected to the front side of the webbing ring (24); the nylon webbing (21) is flexible and can be bent after passing through the front side of the webbing ring (24); a velcro thorn surface (211) is fixedly connected to the bottom of the portion of the nylon webbing (21) that does not pass through the webbing ring (24); a velcro fleece surface (212) is fixedly connected to the bottom of the portion of the nylon webbing (21) that passes through the webbing ring (24); both the velcro thorn surface (211) and the velcro fleece surface (212) are flexible and can be bent together with the nylon webbing (21).

5. A portable intelligent megohmmeter according to claim 2, characterized in that: The safety pressure plate (23) comprises a push rod sleeve (237), one side of the push rod sleeve (237) is connected to a circular through hole, the other side of the push rod sleeve (237) is connected to a rectangular through hole, the top of the push rod sleeve (237) is connected to a rectangular through hole, the top of the push rod sleeve (237) is plugged with a conductive bent rod (238) through the through hole, the cross-sections of both sides of the conductive bent rod (238) are N-shaped, the outside of the conductive bent rod (238) is a polymer, and the inside of the conductive bent rod (238) is a metal conductive The conductive bent rod (238) has a circular through hole on one side thereof, the bottom of the conductive bent rod (238) is electrically connected to the circuit board (3), the metal plug rod (235) is slidably connected to one side of the ejector sleeve (237), the other end of the metal plug rod (235) is fixedly connected to a polymer ejector rod (234), the cross-sectional circular diameter of the polymer ejector rod (234) is larger than the cross-sectional circular diameter of the metal plug rod (235), one end of the polymer ejector rod (234) is fixedly connected to a spring, and the metal plug rod (235) is fixedly connected to one end of the polymer ejector rod (234). The polymer insert rod (235) is slidably connected to the spring, the polymer push rod (234) is slidably connected to the push rod sleeve (237), the other end of the polymer push rod (234) is fixedly connected to a transfer column (233), the other end of the transfer column (233) is fixedly connected to a pressing plate (231), the transfer column (233) is slidably connected to the other end of the top shell (12), and one side of the bottom shell (11) is fixedly connected to a baffle (232), and the cross-sections of the front and back of the baffle (232) are inversely spaced. The pressing plate (231) is slidably connected to the baffle (232), the other side of the pressing plate (231) is fixedly connected to a return spring (236), and the other side of the return spring (236) is fixedly connected to the top shell (12), and the pressing plate (231), the baffle (232), the adapter column (233), the polymer top rod (234), the metal plug rod (235), and the return spring (236) are all two in number and are symmetrically distributed with respect to the center plane of the two side surfaces of the bottom shell (11).

6. A portable intelligent megohmmeter according to claim 1, characterized in that: A copper column (33) is fixedly connected to the top of the circuit board (3). The number of the copper columns (33) is eight, and each group of four is two groups in total. A screen circuit board (34) is fixedly connected to the top of one group of copper columns (33). A screen (341) is fixedly connected to the top of the screen circuit board (34). The screen circuit board (34) is electrically connected to the screen (341). The front of the screen (341) is electrically connected to the top of the circuit board (3) via a flat cable. A button circuit board (35) is fixedly connected to the top of the other group of copper columns (33). A button assembly (351) is fixedly connected to the top of the button circuit board (35). The number of the button assemblies (351) is three and they are evenly distributed on the top of the button assemblies (351). The button assemblies (351) are electrically connected to the button circuit board (35). The button circuit board (35) is electrically connected to the button assembly (351) via a flat cable. A button cover (123) is fixedly connected to the top of the button assembly (351). The button cover (123) is fixedly connected to the top of the button cover (123). 3) is slidably connected to the top of the top shell (12), the number of the button covers (123) is three, the top of the circuit board (3) is fixedly connected to a buzzer (36), the buzzer (36) is electrically connected to the circuit board (3), the top of the circuit board (3) is fixedly connected to a battery compartment base (32), the top of the battery compartment base (32) is fixedly connected to a battery compartment card plate (321), the number of the battery compartment card plates (321) is two, and the center plane of the two side surfaces of the battery compartment base (32) is The battery compartment base (32) is symmetrically distributed, one side of the battery compartment card plate (321) is fixedly connected to a negative electrode sheet (322), one side of the negative electrode sheet (322) is fixedly connected to a battery (323), the battery (323) is electrically connected to the battery compartment base (32) via the negative electrode sheet (322), the battery compartment base (32) is electrically connected to the circuit board (3), the top of the circuit board (3) is fixedly connected to a chipset (31), and the chipset (31) is electrically connected to the circuit board (3) via pins.

7. A portable intelligent megohmmeter according to claim 6, characterized in that: The front side of the test lead plug (39) is connected to a circular through hole, the number of the circular through holes is two, the diameter of the circular through holes is consistent with the diameter of the through hole of the electromagnet plug (4), one of the circular through holes is close to the top surface and one side surface of the test lead plug (39), and the other is close to the bottom surface and the other side surface of the test lead plug (39). The back side of the test lead plug (39) is connected to a sleeve (391), the back side of the sleeve (391) is connected to the back side of the top shell (12), and the sleeve (391) is fixedly connected to the inside of the sleeve (391). The copper sleeve (392) The copper sleeve (392) is fixedly connected to the inner wall of the through hole of the test lead plug (39), the number of the sleeve (391) and the number of the copper sleeve (392) are both two, the test lead plug (39) is connected to the circuit board (3) through the pins of the base, the copper sleeve (392) is electrically connected to the test lead plug (39) through the metal sheet, and the chipset (31) is electrically connected to the conductive bending rod (238), the battery (323), the screen (341), the button assembly (351), the buzzer (36), the test lead plug (39), and the electromagnet plug (4) through the circuit board (3).

8. A portable intelligent megohmmeter according to claim 2, characterized in that: A coil is fixedly connected inside the through hole of the electromagnet plug (4), and the coil is electrically connected to the circuit board (3) through the electromagnet plug (4). A spring is fixedly connected to the front of the electromagnet plug (4). The rubber-coated metal rod (41) is slidably connected to the spring. A rod cover (42) is fixedly connected to the front of the rubber-coated metal rod (41). A metal rod core (411) is fixedly connected inside the rubber-coated metal rod (41). The cross-sectional diameter of the rubber-coated metal rod (41) is consistent with the diameter of the through hole of the copper sleeve (392). A limiting plate (43) is fixedly connected to one side of the inner wall of the top shell (12). The limiting plate (43) is located on the front of the rod cover (42). The center planes of the top and bottom of the limiting plate (43) coincide with the center plane of the rod cover (42). A triangular reinforcing rib is fixedly connected to the front of the limiting plate (43).

9. A portable intelligent megohmmeter according to claim 7, characterized in that: The copper sleeve (392) is slidably connected to the test lead (13); the test lead (13) comprises a terminal (131); the terminal (131) is a hollow structure; the outer diameter of the terminal (131) is consistent with the inner diameter of the copper sleeve (392); the surface of the terminal (131) is slidably connected to the inner wall of the copper sleeve (392); the distance from the front to the back of the terminal (131) is consistent with the distance from the back of the test lead plug (39) to the back of the top shell (12); the terminal (131) is electrically connected to the copper sleeve (392); the back of the terminal (131) is fixedly connected to a plug (132); the plug The bottom of the head (132) is fixedly connected to a pen body (133) via a wire, the top of the pen body (133) is fixedly connected to a metal sheet (134), the number of the metal sheets (134) is two, and they are located at the top and bottom of the metal sheet (134), respectively; the front of the metal sheet (134) is fixedly connected to a probe (135), the probe (135) is electrically connected to the pen body (133), the pen body (133) is electrically connected to a plug (132) via a wire, the plug (132) is electrically connected to a terminal (131), and the number of the test leads (13) is two.

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