阅读说明：本技术 一种防触电的电力维修用测量仪表 (Electric shock prevention measuring instrument for power maintenance ) 是由 李正金 于 2019-11-30 设计创作，主要内容包括：本发明涉及一种防触电的电力维修用测量仪表,包括外壳和两个测量装置,测量装置包括存放盒和测量机构,存放盒内设有导线和收纳机构,收纳机构包括平移组件、移动板、若干套管和若干导管,测量机构包括驱动组件、绝缘管和密封组件,驱动组件包括第一气缸、第一气杆、第一弹簧、压板和连接杆,绝缘管内设有第二气缸、第二气杆和表笔,该防触电的电力维修用测量仪表通过收纳机构方便将导线收纳进存放盒中便于设备的整理存放,也可将导线从存放盒中抽出,便于测量使用,不仅如此,测量机构中,电工人员手执绝缘管按动压板,可使表笔伸出绝缘管进行测量,避免发生触电,并保证了检测精度,从而提高了该万用表的实用性。(The invention relates to an electric shock prevention measuring instrument for power maintenance, which comprises a shell and two measuring devices, wherein each measuring device comprises a storage box and a measuring mechanism, a lead and a storage mechanism are arranged in each storage box, each storage mechanism comprises a translation component, a movable plate, a plurality of sleeves and a plurality of guide pipes, each measuring mechanism comprises a driving component, an insulating pipe and a sealing component, each driving component comprises a first air cylinder, a first air rod, a first spring, a pressing plate and a connecting rod, a second air cylinder, a second air rod and a meter pen are arranged in each insulating pipe, the electric shock prevention measuring instrument for power maintenance conveniently stores the lead into the storage box through the storage mechanism so as to facilitate the arrangement and storage of equipment, and also can draw the lead out of the storage box so as to facilitate the measurement and the use, in addition, in the measuring mechanism, an electrician can manually hold the insulating pipe to press the pressing plate so that the meter pen can extend out of the insulating pipe, and the detection precision is ensured, so that the practicability of the universal meter is improved.)

1. The measuring instrument for power maintenance is characterized by comprising a shell (1) and two measuring devices, wherein the two measuring devices are respectively positioned on two sides of the shell (1), a PLC is arranged in the shell (1), a display screen (2), a knob (3) and a switch (4) are arranged on the shell (1), each measuring device comprises a storage box (5) and a measuring mechanism, the storage box (5) is fixed on the shell (1), a key (6) is arranged on the storage box (5), a lead (34) and an accommodating mechanism are arranged in the storage box (5), one end of the lead (34) is connected with the shell (1), the other end of the lead (34) is connected with the measuring mechanism, and the key (6), the knob (3) and the display screen (2) are electrically connected with the PLC;

the accommodating mechanism comprises a translation assembly, a moving plate (8), a plurality of sleeves (9) and a plurality of guide pipes (10), the translation assembly is in transmission connection with the moving plate (8), the moving plate (8) is fixedly connected with the inner wall of one side of the storage box (5) perpendicular to the side face of the shell (1), the sleeves (9) are uniformly distributed on the inner wall of one side, far away from the moving plate (8), of the storage box (5), the guide pipes (10) are uniformly distributed on one side, close to the sleeves (9), of the moving plate (8), the number of the sleeves (9) is equal to that of the guide pipes (10), the lead (34) is located between the sleeves (9) and the guide pipes (10), and the lead (34) sequentially penetrates through the sleeves (9) and the guide pipes (10);

the measuring mechanism comprises a driving assembly, an insulating tube (11) and a sealing assembly, the driving assembly comprises a first air cylinder (12), a first air rod (13), a first spring (14), a pressing plate (15) and a connecting rod (16), the first air cylinder (12) is fixed on the insulating tube (11), the periphery of the first air rod (13) is in sealing connection with the inner wall of the first air cylinder (12), the first air rod (13) is connected with the bottom in the first air cylinder (12) through the first spring (14), the pressing plate (15) is fixedly connected with the first air rod (13) through the connecting rod (16), a second air cylinder (17), a second air rod (18) and a gauge pen (19) are arranged in the insulating tube (11), the second air cylinder (17) is communicated with the first air cylinder (12), the second air cylinder (17) is fixed in the insulating tube (11), the periphery of the second air rod (18) is in sealing connection with the inner wall of the second air cylinder (17), the gauge pen (19) is fixed on one side, far away from the bottom of the second air cylinder (17), of the second air rod (18), the gauge pen (19) is connected with a lead (34), and the first spring (14) is in a compressed state;

a temperature measuring module is arranged in the shell (1), the temperature measuring module comprises a temperature measuring circuit, the temperature measuring circuit comprises a first operational amplifier U1, a second operational amplifier U2, a third operational amplifier U3, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first adjustable resistor Rp1, a second adjustable resistor Rp2 and a third adjustable resistor Rp3, the inverting input end of the first operational amplifier U1 is connected with the first capacitor C1, the non-inverting input end of the first operational amplifier U1 is grounded through the first resistor R1, the non-inverting input end of the first operational amplifier U1 is connected with the output end of the first operational amplifier U1 through the second resistor Rp2, the output end of the first operational amplifier U1 is grounded through the first adjustable resistor Rp1, an adjustable end of the first adjustable resistor Rp1 is connected with an output end of a first operational amplifier U1, an output end of the first operational amplifier U1 is connected with an inverting input end of a second operational amplifier U2 through a series circuit composed of a third resistor R3 and a fourth resistor R4, an inverting input end of the second operational amplifier U2 is grounded through a third capacitor C3, a non-inverting input end of the second operational amplifier U2 is connected with an inverting input end of a third operational amplifier U3 through a series circuit composed of a second capacitor C2 and a fifth resistor R5 respectively through a third resistor R3 and a fourth resistor R4, an output end of the second operational amplifier U2 is connected with an inverting input end of the third operational amplifier U3 through a sixth resistor R6, an inverting input end of the third operational amplifier U3 is connected with an output end of the third operational amplifier U3 through a third adjustable resistor Rp3, an adjustable end of the third resistor Rp3 is connected with an output end of a third operational amplifier U3, the non-inverting input terminal of the third operational amplifier U3 is grounded through a second adjustable resistor Rp2, and the adjustable terminal of the second adjustable resistor Rp2 is connected to the non-inverting input terminal of the third operational amplifier U3.

2. The electric shock prevention measuring instrument for power maintenance as claimed in claim 1, wherein the translation assembly comprises a motor (20), a bearing seat (21) and a screw (22), the motor (20) and the bearing seat (21) are both fixed in the storage box (5), the motor (20) is in transmission connection with one end of the screw (22), the other end of the screw (22) is arranged in the bearing seat (21), the moving plate (8) is sleeved on the screw (22), and a thread matched with the screw (22) is arranged at the connection part of the moving plate (8) and the screw (22).

3. The electric shock proof electric power maintenance measuring instrument as claimed in claim 1, characterized in that the moving plate (8) is provided with a number of moving wheels (23) on the side away from the conduit (10), the diameter of the moving wheels (23) being the same as the thickness inside the storage box (5).

4. The electric shock prevention measuring instrument for power maintenance according to claim 1, wherein a fixing ring (24) is provided in the first cylinder (12), the fixing ring (24) is fixed to an inner wall of the first cylinder (12), and the fixing ring (24) is fitted over the connecting rod (16).

5. The electric shock-proof measuring instrument for power maintenance according to claim 1, wherein the sealing assembly comprises a sealing plate (25) and two sealing units, the sealing plate (25) is covered on the insulating tube (11), the two sealing units are respectively positioned above and below one side of the sealing plate (25) close to the insulating tube (11), the sealing units comprise a pull rod (26), a second spring (27), a ring (28) and a fixed shaft (29), the fixed shaft (29) is fixed on the insulating tube (11), the ring (28) is sleeved on the fixed shaft (29), the sleeve is connected with one end of the pull rod (26) through the second spring (27), the other end of the pull rod (26) is fixed on the sealing plate (25), and the second spring (27) is in a stretching state.

6. The electric shock proof electric power maintenance measuring instrument as claimed in claim 5, characterized in that the end of the fixed shaft (29) remote from the insulating tube (11) is provided with a limit plate (30).

7. The electric shock preventing measuring instrument for power maintenance according to claim 5, wherein the sealing unit further comprises an insert rod (31) and an insert ring (32), the insert ring (32) is fixed to the insulating tube (11), the insert rod (31) is fixed to the sealing plate (25), and the insert ring (32) is fitted over the insert rod (31).

8. The electric shock preventing electric power maintenance measuring instrument as set forth in claim 7, wherein an end of said plunger (31) remote from said sealing plate (25) is formed in a hemispherical shape.

9. The electric shock preventing measuring instrument for power maintenance as set forth in claim 1, wherein a pull ring (33) is provided at an end of said sealing plate (25) remote from said insulating tube (11).

10. The electric shock prevention measuring instrument for power maintenance as set forth in claim 1, wherein a buzzer (7) is further provided on said housing (1), said buzzer (7) being electrically connected to the PLC.

Technical Field

The invention relates to the field of electrical equipment, in particular to an electric shock prevention measuring instrument for power maintenance.

Background

The multimeter is a common tool for electricians, can be used for measuring various parameters such as voltage, resistance and current, is sometimes called as a three-purpose meter, is often used in the fields of experiments, installation and maintenance of power equipment and the like, and is quite wide in application range.

An existing multimeter generally comprises a meter and two test pens, wherein the test pens are connected with the meter through a test pen connecting line, and then signal measurement is carried out through contact between the two test pens and a detection point. But in the use, receive the length restriction of pen-shape metre line, two pen-shape metres can't contact the measurement to the check point far away apart, some universal meters are in order to overcome this difficulty, can be generally with pen-shape metre line extension, but make two line windings so easily, the arrangement of accomodating of universal meter not convenient for, moreover, the nib of two pen-shape metres of universal meter mostly is for the metal pointer for exposing, in the measurement process, the nib of pen-shape metre is touched easily at the finger position, the measurement accuracy of universal meter has been reduced, can also lead to the user of service to electrocute when serious, and then the practicality that has caused current exterior table reduces.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: in order to overcome the defects of the prior art, the measuring instrument for power maintenance is provided with an electric shock prevention function.

The technical scheme adopted by the invention for solving the technical problems is as follows: an electric shock prevention measuring instrument for power maintenance comprises a shell and two measuring devices, wherein the two measuring devices are respectively positioned on two sides of the shell, a PLC is arranged in the shell, a display screen, a knob and a switch are arranged on the shell, the measuring devices comprise a storage box and a measuring mechanism, the storage box is fixed on the shell, a key is arranged on the storage box, a lead and an accommodating mechanism are arranged in the storage box, one end of the lead is connected with the shell, the other end of the lead is connected with the measuring mechanism, and the key, the knob and the display screen are all electrically connected with the PLC;

the accommodating mechanism comprises a translation assembly, a moving plate, a plurality of sleeves and a plurality of conduits, the translation assembly is in transmission connection with the moving plate, the moving plate is fixedly connected with one inner wall, perpendicular to the side face of the shell, of the storage box, the sleeves are uniformly distributed on the inner wall, far away from the moving plate, of the storage box, the conduits are uniformly distributed on one side, close to the sleeves, of the moving plate, the number of the sleeves is equal to that of the conduits, the conductors are located between the sleeves and the conduits, and the conductors sequentially penetrate through the sleeves and the conduits;

the measuring mechanism comprises a driving assembly, an insulating tube and a sealing assembly, the driving assembly comprises a first air cylinder, a first air rod, a first spring, a pressing plate and a connecting rod, the first air cylinder is fixed on the insulating tube, the periphery of the first air rod is hermetically connected with the inner wall of the first air cylinder, the first air rod is connected with the bottom in the first air cylinder through the first spring, the pressing plate is fixedly connected with the first air rod through the connecting rod, a second air cylinder, a second air rod and a meter pen are arranged in the insulating tube, the second air cylinder is communicated with the first air cylinder, the second air cylinder is fixed in the insulating tube, the periphery of the second air rod is hermetically connected with the inner wall of the second air cylinder, the meter pen is fixed on one side, far away from the bottom of the second air cylinder, the meter pen is connected with a lead, and the first spring is in a compression rotating state;

a temperature measuring module is arranged in the housing, the temperature measuring module comprises a temperature measuring circuit, the temperature measuring circuit comprises a first operational amplifier U1, a second operational amplifier U2, a third operational amplifier U3, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first adjustable resistor Rp1, a second adjustable resistor Rp2 and a third adjustable resistor Rp3, the inverting input end of the first operational amplifier U1 is connected with the first capacitor C1, the non-inverting input end of the first operational amplifier U1 is grounded through the first resistor R1, the non-inverting input end of the first operational amplifier U1 is connected with the output end of the first operational amplifier U1 through the second resistor R2, the adjustable resistor Rp1 of the output end of the first operational amplifier U1 is grounded, an adjustable end of the first adjustable resistor Rp1 is connected with an output end of a first operational amplifier U1, an output end of the first operational amplifier U1 is connected with an inverting input end of a second operational amplifier U2 through a series circuit composed of a third resistor R3 and a fourth resistor R4, an inverting input end of the second operational amplifier U2 is grounded through a third capacitor C3, a non-inverting input end of the second operational amplifier U2 is connected with an inverting input end of a third operational amplifier U3 through a series circuit composed of a second capacitor C2 and a fifth resistor R5 respectively through a third resistor R3 and a fourth resistor R4, an output end of the second operational amplifier U2 is connected with an inverting input end of the third operational amplifier U3 through a sixth resistor R6, an inverting input end of the third operational amplifier U3 is connected with an output end of the third operational amplifier U3 through a third adjustable resistor Rp3, an adjustable end of the third resistor Rp3 is connected with an output end of a third operational amplifier U3, the non-inverting input terminal of the third operational amplifier U3 is grounded through a second adjustable resistor Rp2, and the adjustable terminal of the second adjustable resistor Rp2 is connected to the non-inverting input terminal of the third operational amplifier U3.

Preferably, in order to drive the movable plate to move, the translation assembly comprises a motor, a bearing seat and a screw rod, the motor and the bearing seat are fixed in the storage box, the motor is in transmission connection with one end of the screw rod, the other end of the screw rod is arranged in the bearing seat, the movable plate is sleeved on the screw rod, and a thread matched with the screw rod is arranged at the connection position of the movable plate and the screw rod.

Preferably, in order to realize the smooth movement of the moving plate, a plurality of moving wheels are arranged on one side of the moving plate, which is far away from the guide pipe, and the diameter of each moving wheel is the same as the thickness of the storage box.

Preferably, in order to realize the smooth movement of the connecting rod, a fixing ring is arranged in the first cylinder, the fixing ring is fixed on the inner wall of the first cylinder, and the fixing ring is sleeved on the connecting rod.

Preferably, in order to facilitate the sealing protection of the insulating tube, the sealing assembly comprises a sealing plate and two sealing units, the sealing plate is covered on the insulating tube, the two sealing units are respectively positioned above and below one side, close to the insulating tube, of the sealing plate, the sealing units comprise a pull rod, a second spring, a circular ring and a fixed shaft, the fixed shaft is fixed on the insulating tube, the circular ring is sleeved on the fixed shaft, the sleeve is connected with one end of the pull rod through the second spring, the other end of the pull rod is fixed on the sealing plate, and the second spring is in a stretching state.

Preferably, in order to prevent the ring from falling off the fixed shaft, a limit plate is arranged at one end of the fixed shaft, which is far away from the insulating tube.

Preferably, in order to fix the position of the sealing plate, the sealing unit further includes an insertion rod and an insertion ring, the insertion ring is fixed to the insulating tube, the insertion rod is fixed to the sealing plate, and the insertion ring is sleeved on the insertion rod.

Preferably, in order to facilitate the insertion rod to pass through the insertion ring, one end of the insertion rod far away from the sealing plate is shaped like a hemisphere.

Preferably, in order to facilitate driving the sealing plate to move, a pull ring is arranged at one end of the sealing plate, which is far away from the insulating tube.

Preferably, in order to output the alarm signal, a buzzer is further arranged on the shell and electrically connected with the PLC.

The electric shock prevention measuring instrument for power maintenance has the advantages that wires can be conveniently stored in the storage box through the storage mechanism, the wires can be conveniently drawn out of the storage box, the electric shock prevention measuring instrument is convenient to measure and use, in addition, in the measuring mechanism, an electrician can stretch out of the insulating tube to measure through the insulating tube by pressing the pressing plate through the insulating tube, electric shock is avoided, the detection precision is guaranteed, the practicability of the universal meter is improved, signals are amplified in a multistage mode through the first operational amplifier, the second operational amplifier and the third operational amplifier in the temperature measuring circuit, the accuracy of signal detection is guaranteed, signals are amplified and adjusted through the adjustable resistor, signal overflow is prevented, and the reliability of temperature measurement is improved.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic view of the structure of the electric shock protection measuring instrument for power maintenance of the present invention;

FIG. 2 is a sectional view of a storage case of the electric shock preventing measuring instrument for power maintenance according to the present invention;

FIG. 3 is a schematic view of a measuring mechanism of the electric shock preventive measuring instrument for power maintenance according to the present invention;

FIG. 4 is an enlarged view of portion A of FIG. 3;

FIG. 5 is a schematic circuit diagram of a temperature measuring circuit of the electric shock preventing measuring instrument for power maintenance according to the present invention;

in the figure: 1. the novel gas spring type pressure gauge comprises a shell, a display screen, a knob, a switch, a storage box, a button, a buzzer, a moving plate, a sleeve, a guide pipe, an insulating pipe, a cylinder, a first air rod, a spring, a pressing plate, a connecting rod, a second air cylinder, a second air rod, a pressure plate, a connecting rod, a pull rod, a second spring, a ring, a fixed shaft, a limiting plate, a plug rod, a plug 32, a plug ring, a pull ring and a wire, wherein the display screen, the knob, the switch, the storage box, the button, the pressure plate, the buzzer, the moving plate, the sleeve, the guide pipe, the insulating pipe, the first air rod, the spring.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.

As shown in fig. 1, an electric shock prevention measuring instrument for power maintenance comprises a housing 1 and two measuring devices, wherein the two measuring devices are respectively located at two sides of the housing 1, a PLC is arranged in the housing 1, a display screen 2, a knob 3 and a switch 4 are arranged on the housing 1, the measuring device comprises a storage box 5 and a measuring mechanism, the storage box 5 is fixed on the housing 1, a key 6 is arranged on the storage box 5, a lead 34 and a receiving mechanism are arranged in the storage box 5, one end of the lead 34 is connected with the housing 1, the other end of the lead 34 is connected with the measuring mechanism, and the key 6, the knob 3 and the display screen 2 are all electrically connected with the PLC;

electrician's personnel are when using this external meter to measure, press button 6 on the case 5 of shell 1 both sides, storage device in the case 5 moves, be convenient for prolong the length of wire 34, operation knob 3 on shell 1, select measurement function, press switch 4, after being connected two measurement mechanism and measuring point, can show measuring result through display screen 2, after finishing using, press button 6 once more, storage device moves, take in into storage box 5 with unnecessary wire 34 that exposes, the arrangement of this universal meter of being convenient for is deposited.

As shown in fig. 2, the accommodating mechanism includes a translation assembly, a moving plate 8, a plurality of sleeves 9 and a plurality of guide tubes 10, the translation assembly is in transmission connection with the moving plate 8, the moving plate 8 is fixedly connected with one of the inner walls of the storage boxes 5, which is perpendicular to the side surface of the housing 1, the sleeves 9 are uniformly distributed on the inner wall of the storage box 5, which is far away from the moving plate 8, the guide tubes 10 are uniformly distributed on one side of the moving plate 8, which is close to the sleeves 9, the number of the sleeves 9 is equal to the number of the guide tubes 10, the lead wires 34 are located between the sleeves 9 and the guide tubes 10, and the lead wires 34 sequentially pass through the sleeves 9 and the guide;

in case 5, the steerable movable plate 8 of the steerable translation subassembly of PLC moves, make movable plate 8 be close to or keep away from sleeve pipe 9 and move, thereby increase or reduce the distance between sleeve pipe 9 and the pipe 10, when the distance between sleeve pipe 9 and the pipe 10 increases, can accomodate wire 34 into case 5, the arrangement of the universal meter of being convenient for is deposited, after the distance between sleeve pipe 9 and the pipe 10 reduces, electrician's personnel can take wire 34 out from case 5, be convenient for enlarge measuring mechanism's home range, convenient measurement.

As shown in fig. 3, the measuring mechanism includes a driving assembly, an insulating tube 11 and a sealing assembly, the driving assembly includes a first cylinder 12, a first air rod 13, a first spring 14, a pressure plate 15 and a connecting rod 16, the first cylinder 12 is fixed on the insulating tube 11, the outer periphery of the first air rod 13 is connected with the inner wall of the first cylinder 12 in a sealing manner, the first air rod 13 is connected with the bottom inside the first cylinder 12 through the first spring 14, the pressure plate 15 is fixedly connected with the first air rod 13 through the connecting rod 16, a second cylinder 17, a second air rod 18 and a meter pen 19 are arranged inside the insulating tube 11, the second cylinder 17 is communicated with the first cylinder 12, the second cylinder 17 is fixed inside the insulating tube 11, the outer periphery of the second air rod 18 is connected with the inner wall of the second cylinder 17 in a sealing manner, the meter pen 19 is fixed on the side of the second air rod 18 far from the bottom of the second cylinder 17, the meter pen 19 is connected with a lead 34, and the first spring 14 is in a compressed state.

When using measuring mechanism to measure, electrician's accessible seal assembly opens the opening of insulating tube 11, hold insulating tube 11 back, press down clamp plate 15, it is close to the removal to the bottom in the first cylinder 12 to drive first gas pole 13 through connecting rod 16, compress first spring 14, thereby make the air in the first cylinder 12 flow to in the second cylinder 17 in the insulating tube 11, make the inner wall that second gas pole 18 kept away from second cylinder 17 remove, and then promote the movement of pen-shape metre 19, make pen-shape metre 19 stretch out insulating tube 11, and then can measure pen-shape metre 19 near the measuring point, because electrician's hand breaks away from pen-shape metre 19 during the measurement, do not contact with pen-shape metre 19, thereby can prevent electrician's electric shock, guarantee the measuring accuracy simultaneously. After the measurement finishes, electrician loosens clamp plate 15, and the first spring 14 that is compressed this moment is for resumeing deformation, promotes first gas pole 13 and keeps away from the bottom removal in first cylinder 12 to make connecting rod 16 drive clamp plate 15 and reset, and, in second cylinder 17, second gas pole 18 is close to the removal to the bottom in the second cylinder 17, makes in meter pen 19 income insulating tube 11, then can carry out the sealed protection of meter pen 19 to the opening part of insulating tube 11 through seal assembly.

As shown in fig. 5, a temperature measurement module is disposed in the housing 2, the temperature measurement module includes a temperature measurement circuit, the temperature measurement circuit includes a first operational amplifier U1, a second operational amplifier U2, a third operational amplifier U3, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first adjustable resistor R1, a second adjustable resistor Rp2, and a third adjustable resistor Rp3, an inverting input terminal of the first operational amplifier U1 is connected to the first capacitor C1, a non-inverting input terminal of the first operational amplifier U1 is grounded through the first resistor R1, a non-inverting input terminal of the first operational amplifier U1 is connected to an output terminal of the first operational amplifier U1 through the second resistor R2, a non-inverting input terminal of the first operational amplifier U5953 is grounded through the first adjustable resistor R84 1, an adjustable end of the first adjustable resistor Rp1 is connected with an output end of a first operational amplifier U1, an output end of the first operational amplifier U1 is connected with an inverting input end of a second operational amplifier U2 through a series circuit composed of a third resistor R3 and a fourth resistor R4, an inverting input end of the second operational amplifier U2 is grounded through a third capacitor C3, a non-inverting input end of the second operational amplifier U2 is connected with an inverting input end of a third operational amplifier U3 through a series circuit composed of a second capacitor C2 and a fifth resistor R5 respectively through a third resistor R3 and a fourth resistor R4, an output end of the second operational amplifier U2 is connected with an inverting input end of the third operational amplifier U3 through a sixth resistor R6, an inverting input end of the third operational amplifier U3 is connected with an output end of the third operational amplifier U3 through a third adjustable resistor Rp3, an adjustable end of the third resistor Rp3 is connected with an output end of a third operational amplifier U3, the non-inverting input terminal of the third operational amplifier U3 is grounded through a second adjustable resistor Rp2, and the adjustable terminal of the second adjustable resistor Rp2 is connected to the non-inverting input terminal of the third operational amplifier U3.

The temperature measuring module measures temperature, and in the temperature measuring circuit, signals are amplified in three stages through amplifying circuits formed by a first operational amplifier U1, a second operational amplifier U2 and a third operational amplifier U3 respectively, so that the accuracy of signal detection is guaranteed; the first adjustable resistor Rp1, the second adjustable resistor Rp2 and the third adjustable resistor Rp3 are used for adjusting signal amplification, signal overflow is prevented, and reliability of temperature measurement is improved.

As shown in fig. 2, the translation assembly includes a motor 20, a bearing seat 21 and a screw 22, the motor 20 and the bearing seat 21 are both fixed in the storage box 5, the motor 20 is in transmission connection with one end of the screw 22, the other end of the screw 22 is arranged in the bearing seat 21, the moving plate 8 is sleeved on the screw 22, and a thread matched with the screw 22 is arranged at a connection position of the moving plate 8 and the screw 22.

The PLC controls the motor 20 to start, and drives the screw 22 to rotate under the supporting action of the bearing block 21, and the screw 22 acts on the moving plate 8 through the thread, so that the moving plate 8 moves along the axial direction of the screw 22.

Preferably, in order to achieve smooth movement of the moving plate 8, the moving plate 8 is provided with a plurality of moving wheels 23 on a side thereof away from the guide tube 10, and the diameter of the moving wheels 23 is the same as the thickness of the storage box 5. Through the inner wall of the upper and lower both sides of removing wheel 23 and case 5 support and lean on, when preventing that screw rod 22 from rotatory, drive movable plate 8 and rotate for remove wheel 23 removes in case 5, is convenient for realize the steady movement of movable plate 8.

Preferably, in order to realize the smooth movement of the connecting rod 16, a fixing ring 24 is arranged in the first cylinder 12, the fixing ring 24 is fixed on the inner wall of the first cylinder 12, and the fixing ring 24 is sleeved on the connecting rod 16. The moving direction of the connecting rod 16 is fixed by the fixing ring 24 fixed in the first cylinder 12, and smooth movement of the connecting rod 16 is achieved.

Preferably, in order to facilitate the sealing protection of the insulating tube 11, the sealing assembly includes a sealing plate 25 and two sealing units, the sealing plate 25 covers the insulating tube 11, the two sealing units are respectively located above and below one side of the sealing plate 25 close to the insulating tube 11, the sealing units include a pull rod 26, a second spring 27, a ring 28 and a fixed shaft 29, the fixed shaft 29 is fixed on the insulating tube 11, the ring 28 is sleeved on the fixed shaft 29, the sleeve is connected with one end of the pull rod 26 through the second spring 27, the other end of the pull rod 26 is fixed on the sealing plate 25, and the second spring 27 is in a stretching state.

In the sealing assembly, the opening of the insulating tube 11 can be blocked by the sealing plate 25, the internal meter pen 19 is isolated and protected, when the meter pen 19 is used for measurement, the insulating tube 11 is exposed for the convenience of the meter pen 19, at the moment, the sealing plate 25 can be pulled to move away from the insulating tube 11, the second spring 27 is further stretched, then the sealing plate 25 is rotated, the sealing plate 25 is separated from the opening of the insulating tube 11, after the use is finished, the sealing plate 25 is pulled, the second ring 28 is further stretched by the pull rod 26, under the supporting action of the fixed shaft 29, the ring 28 rotates along the fixed shaft 29, after the sealing plate 25 is aligned with the opening of the insulating tube 11, the sealing plate 25 is loosened, at the moment, the stretched second spring 27 is in order to restore deformation, the pull rod 26 is close to the insulating tube 11, the sealing plate 25 is abutted against the insulating tube 11, and the internal meter pen 19 is.

Preferably, in order to prevent the ring 28 from falling off the fixed shaft 29, a limit plate 30 is provided at one end of the fixed shaft 29 away from the insulating tube 11. Since the ring 28 cannot pass through the stopper plate 30, the ring 28 is restricted on the fixed shaft 29, and the ring 28 is prevented from coming off the fixed shaft 29.

Preferably, in order to fix the position of the sealing plate 25, the sealing unit further includes an insert rod 31 and an insert ring 32, the insert ring 32 is fixed on the insulating tube 11, the insert rod 31 is fixed on the sealing plate 25, and the insert ring 32 is sleeved on the insert rod 31.

When the sealing plate 25 is loosened after the insertion rod 31 is aligned with the insertion ring 32, the second spring 27 pulls the sealing plate 25 close to the insulating tube 11 by the pull rod 26, and the insertion rod 31 passes through the insertion ring 32, thereby further reinforcing the sealing plate 25 and preventing the sealing plate 25 from sliding and separating from the opening of the insulating tube 11.

Preferably, in order to facilitate the insertion rod 31 to pass through the insertion ring 32, an end of the insertion rod 31 remote from the sealing plate 25 is formed in a hemispherical shape. The hemispherical design reduces the size of the end of the insert rod 31 remote from the sealing plate 25, thereby facilitating the insertion of the insert rod 31 through the insert ring 32 to reinforce the sealing plate 25.

Preferably, in order to facilitate the movement of the sealing plate 25, a pulling ring 33 is disposed at one end of the sealing plate 25 away from the insulating tube 11. The pulling ring 33 facilitates the movement and rotation of the sealing plate 25.

Preferably, in order to output an alarm signal, a buzzer 7 is further arranged on the housing 1, and the buzzer 7 is electrically connected with the PLC. When the danger signal is detected, the PLC controls the buzzer 7 to sound to warn electricians.

This universal meter is when using, translation subassembly in the case 5 can drive the movable plate 8 and remove, adjust the distance between sleeve pipe 9 and the pipe 10, when the distance between sleeve pipe 9 and the pipe 10 increases, can accomodate into the case 5 with wire 34, make things convenient for the arrangement of equipment to deposit, and the back is reduced to the distance of sleeve pipe 9 and pipe 10, can take wire 34 out from case 5, enlarge measuring mechanism's home range, be convenient for measure, not only, in the measurement process, through opening behind the seal assembly, electrician's personnel hand holds insulating tube 11, press clamp plate 15, can make pen-shape metre 19 stretch out insulating tube 11 and measure, avoid taking place the electric shock, and guaranteed the detection precision, thereby the practicality of this universal meter has been improved.

Compared with the prior art, this protection against electric shock's measuring instrument for power maintenance is convenient for accomodate wire 34 into storage box 5 through receiving mechanism and is convenient for the arrangement of equipment to deposit, also can take wire 34 out from storage box 5, be convenient for measure and use, moreover, among the measuring mechanism, electrician's hand is held insulating tube 11 and is pressed clamp plate 15, can make pen-shape metre 19 stretch out insulating tube 11 and measure, avoid taking place the electric shock, and detection accuracy has been guaranteed, thereby the practicality of this universal meter has been improved, carry out multistage enlargies through first operational amplifier, second operational amplifier and third operational amplifier among the temperature measurement circuit to the signal, thereby guarantee the accuracy nature to signal detection, rethread adjustable resistance amplifies the regulation to the signal, prevent the signal overflow, temperature measurement's reliability has been improved.

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.