CN118130856B - A non-contact current detection device for building fire fighting equipment - Google Patents

Abstract

The invention relates to the technical field of fire protection detection devices and discloses a non-contact current detection device of building fire protection equipment, which comprises an ammeter, a pincerlike detection mechanism, a magnetism isolating mechanism, a fixing mechanism and a driving mechanism, wherein the ammeter is used for detecting a wire under the condition that the ammeter does not need to be in direct contact with a bare wire or a broken circuit, the pincerlike detection mechanism is used for sensing an electric field generated after the wire is electrified, the magnetism isolating mechanism is used for shielding a magnetic field generated by an external wire in the process of detecting the wire current, the detection precision is improved, the fixing mechanism is used for fixing the detected wire in the middle of the pincerlike detection mechanism, the detection precision is improved, meanwhile, the wire is straightened, the penetration of a magnetic field released by the wire due to bending of the wire is reduced, the measuring precision is reduced, and the driving mechanism is used for driving the movement of the pincerlike detection mechanism, and the fixing and straightening of the wire are controlled.

Description

A non-contact current detection device for building fire fighting equipment

Technical Field

The invention relates to the technical field of fire detection devices, in particular to a non-contact current detection device for building fire fighting equipment.

Background technique

The non-contact current detection device for building fire protection equipment is a professional equipment used to monitor and diagnose the electrical safety of building fire protection facilities. Due to the use of non-contact measurement, operators do not need to directly contact live parts, which greatly reduces the risk of electric shock. The non-contact current detection device is compact in design, easy to carry and use, and can perform on-site detection quickly and accurately. It is suitable for current detection of various building fire protection facilities, including automatic fire alarm systems, automatic sprinkler fire extinguishing systems, fire hydrant systems, etc.

After massive searches, it was found that the prior art publication number is CN113433372B, which discloses a non-contact current detection device for building fire protection equipment. In the invention, by arranging support plates at both ends of the lower shell, a clamping device is arranged on the top of the support plate, and the cable is clamped on both sides of the lower shell, it can be ensured that the cable passing through the Rogowski coil is always at the axis of the Rogowski coil, thereby improving the accuracy of the measurement result and solving the problem that the existing clamping device is located on one side of the Rogowski coil, and there is a certain distance between the clamping device and the Rogowski coil. When the cable passes through the clamping device and then passes through the Rogowski coil, the cable may bend, and the cable cannot be guaranteed to be at the axis of the Rogowski coil, resulting in unstable measurement results.

Therefore, based on the above search and combined with the existing, in the actual use process, the lines of building fire protection facilities are usually concentrated inside the electrical box, so that the magnetic field generated by the internal circuit is relatively chaotic. Because when the current directions in two parallel current-carrying straight wires are the same, the magnetic field directions they generate in the area between the two wires are the same, so the magnetic field strength is enhanced; in the area outside the two wires, due to the opposite magnetic field directions, the magnetic field strength is weakened. If the current directions in the two wires are opposite, the magnetic field in the middle area will be weakened, while the magnetic field in the outer area will be enhanced, resulting in that when one of the wires is detected, the magnetic field emitted by the remaining wires will interfere with the measurement structure. At the same time, placing the wire fixing device inside the detection will cause the magnetic field to change, affecting the measurement accuracy, and the angle between the wire and the magnetic induction coil will also affect the detection results. If the plane of the magnetic induction coil is perpendicular to the direction of the magnetic field, the magnetic induction coil will cut the magnetic lines of force better, the induced current generated will be stronger, and the detection accuracy will be higher. On the contrary, if the plane of the magnetic induction coil is parallel to the direction of the magnetic field, almost no induced current will be generated. For this reason, we propose a non-contact current detection device for building fire protection equipment.

Summary of the invention

In view of the deficiencies in the prior art, the present invention provides a non-contact current detection device for building fire fighting equipment, which has the advantages of isolating external magnetic field interference and improving detection accuracy, thereby solving a series of problems such as low detection accuracy.

To achieve the above object, the present invention provides the following technical solution: a non-contact current detection device for building fire fighting equipment, comprising:

Ammeters, used to test wires without having to make direct contact with exposed wires or disconnect the circuit;

A clamp-shaped detection mechanism, the clamp-shaped detection mechanism is used to sense the electric field generated by the wire after being energized, the inner two sides of the ammeter are fixedly connected with a rotating shaft, the clamp-shaped detection mechanism is rotatably connected to the outside of the rotating shaft, and the outside of the clamp-shaped detection mechanism is slidably connected with a magnetic isolation mechanism, the magnetic isolation mechanism is used to shield the magnetic field generated by the external wire of the clamp-shaped detection mechanism during the process of detecting the current of the middle wire of the clamp-shaped detection mechanism, so as to improve the detection accuracy, and the two sides of the clamp-shaped detection mechanism are fixedly connected with a fixing mechanism, and the fixing mechanism is used to fix the detected wire in the middle of the clamp-shaped detection mechanism to improve the detection accuracy;

The driving mechanism is fixedly connected to the inner side of the ammeter, the driving mechanism is linked with the clamp detection mechanism and the fixing mechanism, and the driving mechanism is used to drive the movement of the clamp detection mechanism and control the fixing and straightening of the wire by the fixing mechanism.

Preferably, the clamp-shaped detection mechanism includes a left clamp shell and a right clamp shell rotatably connected to the outside of the rotating shaft, and the left clamp shell and the right clamp shell are both fixedly installed with iron cores inside, and the outside of the iron cores are wound with magnetic induction coils, and both ends of the two iron cores are arranged in a zigzag shape, and the two ends of the two iron cores are abutted against each other.

Preferably, the magnetic isolation mechanism includes a sliding plate fixedly installed on the side where the left clamp shell and the right clamp shell are separated, the sliding plate is slidably connected to a sliding block inside, the sliding block is slidably connected to a magnetic isolation shell outside, the top of the sliding block is rotatably installed with a rotating block, the top of the rotating block is rotatably installed with a rotating cover, the bottom of the rotating cover is fixedly connected to the top of the magnetic isolation shell, the outside of the sliding block is provided with a magnetic isolation spring, the top of the magnetic isolation spring abuts against the inner top of the rotating cover, the bottom of the magnetic isolation spring abuts against the top of the magnetic isolation shell, and the interior of the magnetic isolation shell is respectively adapted to the exterior of the corresponding left clamp shell and right clamp shell.

Preferably, the magnetic isolation mechanism also includes a magnetic isolation magnet box fixedly installed inside the left clamp housing and the right clamp housing, the magnetic isolation magnet box is made of iron, an isolation box is fixedly installed inside the magnetic isolation magnet box, the iron core is fixedly installed inside the isolation box, and an isolation cavity is provided on the inside of the magnetic isolation magnet box and the outside of the isolation box.

Preferably, the fixing mechanism includes a first fixing plate fixedly installed on both sides of the left clamp housing and the right clamp housing respectively, and a second fixing plate is fixedly installed on both inner sides of the ammeter, and the second fixing plate and one side of the first fixing plate are rotatably connected with a sliding sleeve, a sliding groove is provided inside the sliding sleeve, and a sliding rod is slidably connected inside the sliding sleeve, one end of the sliding rod is rotatably connected to a roller, and two telescopic springs are arranged inside the sliding sleeve.

Preferably, the two telescopic springs are arranged symmetrically, the left ends of the two telescopic springs are fixedly connected to the bottom of the sliding rod, and the right ends of the two telescopic springs are fixedly connected to the inner side of the sliding sleeve. The bottom of the sliding rod is fixedly connected with a driving wire, and the driving wire extends to the outside of the sliding sleeve and is interspersed with the inside of the first fixed plate and the inside of the second fixed plate. One end of the three driving wires on the same side is fixedly connected to the same pull wire.

Preferably, the driving mechanism includes a driving shell fixedly mounted on one side of the ammeter, a driving button being slidably connected to the interior of the driving shell, a driving bar being fixedly connected to one side of the driving button, the driving bar extending to the outside of the driving shell, a driving spring being arranged inside the driving shell, one end of the driving spring being fixedly connected to one side of the driving button, the other end of the driving spring being fixedly connected to the inner side of the driving shell, the driving spring being sleeved on the outside of the driving bar inside the driving shell, and one side of the driving bar extending to the outside of the driving shell is provided with meshing teeth.

Preferably, the inner two sides of the ammeter are rotatably connected with a driving shaft, the outer side of the driving shaft is fixedly connected with a driving gear, two driving gears are provided and arranged symmetrically, and both driving gears are meshed with the meshing teeth on one side of the driving bar.

Preferably, a drive plate is fixedly connected to the outside of the drive shaft, and two drive plates are provided and arranged symmetrically. The two drive plates are adapted to the corresponding left clamp housing and right clamp housing. Clamping springs are provided on the opposite sides of the left clamp housing and the right clamp housing, one side of the clamping spring is fixedly connected to one side of the left clamp housing, and the other side of the clamping spring is fixedly connected to one side of the right clamp housing.

Preferably, the outside of the driving shaft is fixedly connected to a driving roller, two driving rollers are provided and arranged symmetrically, the pull wire passes through the rotating shaft and is wound around the outside of the driving roller, and one end of the pull wire is fixedly connected to the outside of the driving roller.

Compared with the prior art, the present invention provides a non-contact current detection device for building fire protection equipment, which has the following beneficial effects: the invention, through the provision of a magnetic isolation mechanism, is used to shield the magnetic field generated by the external wire during the process of detecting the wire current, thereby improving the detection accuracy; the provision of a fixing mechanism is used to fix the detected wire in the middle of the clamp-shaped detection mechanism to ensure uniform distribution of the magnetic field, thereby making the induced current more accurate and improving the detection accuracy; at the same time, the wire is straightened to reduce the overlap of the magnetic field released by the wire due to its own bending at the bend, thereby affecting the measurement accuracy; the provision of a driving mechanism is used to drive the movement of the clamp-shaped detection mechanism, while controlling the fixing and straightening of the wire by the fixing mechanism.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a three-dimensional structure of the present invention;

FIG2 is a schematic diagram of the internal structure of the present invention;

FIG3 is a schematic structural diagram of a driving button portion of the present invention;

FIG4 is an enlarged structural schematic diagram of part A of FIG3 ;

FIG5 is a schematic structural diagram of a driving roller drum portion of the present invention;

FIG6 is an enlarged structural schematic diagram of portion C of FIG5 ;

FIG7 is an enlarged structural schematic diagram of part B of FIG3 ;

FIG. 8 is an enlarged schematic diagram of the driving roller portion of the present invention.

In the figure: 1. ammeter; 2. clamp detection mechanism; 3. magnetic isolation mechanism; 4. fixing mechanism; 5. driving mechanism; 6. detection probe; 7. left clamp shell; 8. right clamp shell; 9. magnetic isolation magnet box; 10. isolation box; 11. iron core; 12. magnetic induction coil; 13. sliding plate; 14. sliding block; 15. magnetic isolation shell; 16. rotating block; 17. rotating cover; 18. magnetic isolation spring; 19. rotating shaft; 20. clamping spring; 21. driving shell; 22. driving button; 23. driving spring; 24. driving bar; 25. driving shaft; 26. driving gear; 27. driving plate; 28. first fixed plate; 29. second fixed plate; 30. sliding sleeve; 31. sliding rod; 32. roller; 33. driving line; 34. telescopic spring; 35. pulling line; 36. driving reel.

Detailed ways

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.

As introduced in the background technology, there are deficiencies in the prior art. In order to solve the above technical problems, the present application proposes a non-contact current detection device for building fire fighting equipment.

In a typical embodiment of the present application, as shown in FIG. 1 to FIG. 8 , a non-contact current detection device for building fire fighting equipment includes:

The ammeter 1 is used to detect the wire without directly contacting the exposed wire or disconnecting the circuit. The detection principle is the same as that of the existing clamp ammeter. The top of the ammeter 1 is plugged with a detection probe 6;

The clamp-shaped detection mechanism 2 is used to sense the electric field generated after the conductor is energized. The inner two sides of the ammeter 1 are fixedly connected with a rotating shaft 19. The clamp-shaped detection mechanism 2 is rotatably connected to the outside of the rotating shaft 19. The clamp-shaped detection mechanism 2 includes a left clamp shell 7 and a right clamp shell 8 rotatably connected to the outside of the rotating shaft 19. The left clamp shell 7 and the right clamp shell 8 are fixedly installed with an iron core 11 inside. The outside of the iron core 11 is wound with a magnetic induction coil 12. Both ends of the two iron cores 11 are arranged in a zigzag shape, which can improve the detection accuracy. Specifically, the connection between the two iron cores 11 is designed to be in a zigzag shape to increase the contact area to improve the efficiency of the magnetic circuit. The zigzag shape design helps to reduce the air gap, thereby reducing the magnetic resistance, so that the magnetic flux passes through the iron core 11 more smoothly, while avoiding the two iron cores 11 having obvious displacement space, thereby ensuring the stability of the magnetic induction coil 12 and the performance of the iron core 11.

The outside of the clamp-shaped detection mechanism 2 is slidably connected with a magnetic isolation mechanism 3, which is used to shield the magnetic field generated by the external wire of the clamp-shaped detection mechanism 2 during the process of detecting the current of the middle wire of the clamp-shaped detection mechanism 2, so as to improve the detection accuracy. The magnetic isolation mechanism 3 includes a sliding plate 13 fixedly installed on the side where the left clamp housing 7 and the right clamp housing 8 are separated, the inside of the sliding plate 13 is slidably connected with a sliding block 14, the outside of the sliding block 14 is slidably connected with a magnetic isolation shell 15, and the magnetic isolation shell 15 is made of aluminum alloy soft magnetic material. The top of the sliding block 14 is rotatably installed with a rotating block 16, and the rotating block 16 The top of the magnetic isolation shell 15 is rotatably mounted with a rotating cover 17, the bottom of the rotating cover 17 is fixedly connected to the top of the magnetic isolation shell 15, the outer sleeve of the sliding block 14 is provided with a magnetic isolation spring 18, the top of the magnetic isolation spring 18 abuts against the inner top of the rotating cover 17, the bottom of the magnetic isolation spring 18 abuts against the top of the magnetic isolation shell 15, the interior of the magnetic isolation shell 15 is respectively adapted to the exterior of the corresponding left clamp shell 7 and the right clamp shell 8, which can improve the detection accuracy. Specifically, most electrical equipment will be concentrated in the interior of a box, so that there are several wires in the box that are energized and release the magnetic field. When two parallel current-carrying wires are connected, the magnetic field is released. When the current directions in the straight conductors are the same, the magnetic fields they generate in the area between the two conductors are in the same direction, so the magnetic field strength is enhanced; in the area outside the two conductors, the magnetic field strength is weakened because the magnetic field directions are opposite. If the current directions in the two conductors are opposite, the magnetic field in the middle area will be weakened, while the magnetic field in the outer area will be enhanced, resulting in that when one of the conductors is detected, the magnetic field emitted by the remaining conductors will interfere with the measurement structure. At this time, according to the axial direction of the remaining conductors, the two magnetic isolation shells 15 are pulled out to the outside of the clamp-shaped detection mechanism 2 by rotating the cover 17 to isolate The magnetic spring 18 is compressed, and the rotating cover 17 is rotated to make the magnetic isolation shell 15 parallel to the external wire to be inspected, and the rotating cover 17 is slid. The sliding of the rotating cover 17 drives the rotating block 16 to slide. The sliding of the rotating block 16 drives the sliding block 14 to slide inside the sliding plate 13. The sliding of the sliding block 14 drives the magnetic isolation shell 15 to slide, and the magnetic isolation shell 15 is slid between the external wire and the wire to be measured. At this time, the rotating cover 17 is released, so that the opposite sides of the two magnetic isolation shells 15 are in contact with the outside of the ammeter 1, thereby separating the magnetic field of the external wire from the magnetic field of the wire to be measured, thereby improving the detection accuracy.

The magnetic isolation mechanism 3 also includes an isolation magnet box 9 fixedly installed inside the left clamp housing 7 and the right clamp housing 8. The isolation magnet box 9 is made of iron. An isolation box 10 is fixedly installed inside the isolation magnet box 9. An iron core 11 is fixedly installed inside the isolation box 10. An isolation cavity is provided on the inner side of the isolation magnet box 9 and the outer side of the isolation box 10, which can improve the detection accuracy. Specifically, since the isolation magnet box 9 is made of iron, due to the high magnetic permeability of iron, the magnetic field lines tend to pass through the isolation magnet box 9 rather than the air. This phenomenon is called the magnetic shielding effect, that is, the isolation magnet box 9 absorbs and guides the magnetic field to isolate or shield the influence of the magnetic field on the surrounding environment, thereby improving the detection accuracy. More specifically, the isolation magnet box 9 is isolated from the isolation box 10 by the isolation cavity, so that the magnetic field inside the isolation magnet box 9 will not be transmitted to the inside of the isolation box 10.

The driving mechanism 5 is fixedly connected to the inner side of the ammeter 1. The driving mechanism 5 is linked with the clamp detection mechanism 2 and the fixing mechanism 4. The driving mechanism 5 is used to drive the movement of the clamp detection mechanism 2 and control the fixing and straightening of the wire by the fixing mechanism 4. The driving mechanism 5 includes a driving shell 21 fixedly installed on one side of the ammeter 1. The interior of the driving shell 21 is slidably connected with a driving button 22. One side of the driving button 22 is fixedly connected with a driving bar 24. The driving bar 24 extends to the outside of the driving shell 21. A driving spring 23 is arranged inside the driving shell 21. One end of the driving spring 23 is fixedly connected to one side of the driving button 22. The other end of the driving spring 23 is fixedly connected to the inner side of the driving shell 21. The driving spring 23 is sleeved inside the driving shell 21. The outside of the driving bar 24, one side of the driving bar 24 extending to the outside of the driving shell 21 is provided with meshing teeth, the inner two sides of the ammeter 1 are rotatably connected with the driving shaft 25, the outside of the driving shaft 25 is fixedly connected with a driving gear 26, two driving gears 26 are provided, and they are symmetrically arranged, and the two driving gears 26 are meshed with the meshing teeth on one side of the driving bar 24, the outside of the driving shaft 25 is fixedly connected with a driving plate 27, two driving plates 27 are provided, and they are symmetrically arranged, and the two driving plates 27 are adapted to the corresponding left clamp shell 7 and right clamp shell 8, and the opposite side of the left clamp shell 7 and the right clamp shell 8 is provided with a clamping spring 20, one side of the clamping spring 20 is fixedly connected to one side of the left clamp shell 7, and the other side of the clamping spring 20 is fixedly connected to one side of the right clamp shell 8.

The above-mentioned features can realize driving the opening and closing of the clamp detection mechanism 2. Specifically, when it is necessary to detect the wire, the driving button 22 is first pressed to compress the driving spring 23, and the driving button 22 slides inside the driving shell 21. The sliding of the driving button 22 drives the sliding of the driving bar 24, and the sliding of the driving bar 24 drives the two driving gears 26 to rotate. The rotation of the two driving gears 26 drives the driving shaft 25 to rotate. The rotation of the two driving shafts 25 drives the two driving plates 27 to rotate. The two driving plates 27 rotate and abut against the left clamp shell 7 and the right clamp shell 8, so that the left clamp shell 7 and the driving mechanism 5 rotate around the rotation axis. 19 is rotated to separate the left clamp housing 7 from the right clamp housing 8, and the wire to be detected can be inserted into the inside of the ammeter 1. After the wire to be detected is inserted into the inside of the ammeter 1, the driving button 22 is released, the driving spring 23 is stretched, and the driving button 22 slides in the opposite direction inside the driving housing 21, and drives the driving bar 24 to slide, and the sliding of the driving bar 24 drives the driving gear 26 to slide, and the sliding of the driving gear 26 drives the driving shaft 25 to rotate, so that the two driving plates 27 are separated from the ammeter 1, and at the same time the clamping spring 20 is stretched, so that the two ends of the left clamp housing 7 and the right clamp housing 8 are abutted, so that the two ends of the two iron cores 11 are abutted;

More specifically, the left clamp housing 7 and the right clamp housing 8 are cross-rotated and connected to the outside of the rotating shaft 19, forming a scissor-like structure. At the same time, the limit of rotation of the driving shaft 25 is 90°. By pressing the driving button 22, the two ends of the two driving plates 27 are respectively abutted against the opposite sides of the left clamp housing 7 and the right clamp housing 8, so that the final rotation angles of the left clamp housing 7 and the right clamp housing 8 around the rotating shaft 19 are equal, which can ensure that the fixing mechanisms 4 on both sides of the left clamp housing 7 and the right clamp housing 8 can simultaneously loosen and fix the wires, thereby improving the position accuracy of the fixed wires and indirectly improving the measurement accuracy of the wire current.

Both sides of the clamp-shaped detection mechanism 2 are fixedly connected with a fixing mechanism 4, and the fixing mechanism 4 is used to fix the detected wire in the middle of the clamp-shaped detection mechanism 2 to improve the detection accuracy. At the same time, the wire is straightened to reduce the magnetic field released by the wire due to its own bending, which reduces the measurement accuracy. The fixing mechanism 4 includes a first fixing plate 28 fixedly installed on both sides of the left clamp housing 7 and the right clamp housing 8, respectively. The second fixing plate 29 is fixedly installed on both sides of the inner side of the ammeter 1. The second fixing plate 29 and one side of the first fixing plate 28 are rotatably connected with a sliding sleeve 30, and a wedge block is fixedly connected to one side of the sliding sleeve 30. The interior of the sliding sleeve 30 is provided with a sliding The interior of the sliding sleeve 30 is slidably connected with a sliding rod 31, one end of the sliding rod 31 is connected to a roller 32 for damping rotation, and the roller 32 is arranged in a conical shape. Two telescopic springs 34 are arranged symmetrically, and the left ends of the two telescopic springs 34 are fixedly connected to the bottom of the sliding rod 31, and the right ends of the two telescopic springs 34 are fixedly connected to the inner side of the sliding sleeve 30. The bottom of the sliding rod 31 is fixedly connected with a driving wire 33, which extends to the outside of the sliding sleeve 30 and is interspersed with the inside of the first fixing plate 28 and the inside of the second fixing plate 29. The three driving wires 33 on the same side One end of the driving shaft 25 is fixedly connected to the same pulling wire 35, and the outside of the driving shaft 25 is fixedly connected to a driving wire drum 36. Two driving wire drums 36 are provided and are symmetrically arranged. The pulling wire 35 passes through the rotating shaft 19 and is wound around the outside of the driving wire drum 36. One end of the pulling wire 35 is fixedly connected to the outside of the driving wire drum 36. The wire to be detected is fixed at the center of the ammeter 1 and the wire is straightened. Specifically, when the driving button 22 is pressed to separate the left clamp housing 7 from the right clamp housing 8, the driving shaft 25 rotates to drive the two driving wire drums 36 to rotate. The two driving wire drums 36 rotate to pull the pulling wire 35, and the pulling wire 35 is wound around the driving Outside the wire roller 36, the pull wire 35 moves to drive the corresponding three driving wires 33 to move, and the movement of the three driving wires 33 drives the telescopic spring 34 inside the sliding sleeve 30 to compress, and at the same time, the sliding rod 31 retracts inside the sliding sleeve 30, and the retraction of the sliding sleeve 30 drives the roller 32 to move, so that the central space of the clamp-shaped detection mechanism 2 gradually becomes larger, and wires of different diameters can be placed inside. At the same time, because two of the rollers 32 are parallel to the opening position of the clamp-shaped detection mechanism 2, after the wire is placed inside the clamp-shaped detection mechanism 2 from the opening position, the outsides of the two rollers 32 parallel to the opening position of the clamp-shaped detection mechanism 2 touch;

When fixing and straightening the wire, first release the drive button 22, drive the wire roller 36 to rotate in the opposite direction, and stretch the telescopic spring 34. The outside of the six rollers 32 abuts against the outside of the wire, so that the wire is fixed during the closing process of the clamp detection mechanism 2 and fixed at the center of the clamp detection mechanism 2, ensuring that the magnetic field is evenly distributed, so that the induced current is more accurate, and the measurement accuracy is improved. More specifically, the fixing mechanism 4 is arranged on both sides of the clamp detection mechanism 2, so that the middle detection position of the clamp detection mechanism 2 is not affected, and the detection accuracy of the wire is improved. At the same time, since a wedge block is fixedly connected to one side of the sliding sleeve 30, the fixing mechanism After the wire is fixed at the center of the clamp-shaped detection mechanism 2, the telescopic spring 34 inside the sliding sleeve 30 continues to stretch, so that the fixing mechanisms 4 on both sides extend in the direction of separation, thereby straightening the wire. If the plane of the magnetic induction coil 12 is perpendicular to the direction of the magnetic field, the effect of the magnetic induction coil 12 cutting the magnetic force lines is better, and the generated induced current is also stronger. On the contrary, if the plane of the magnetic induction coil 12 is parallel to the direction of the magnetic field, almost no induced current is generated. At the same time, since the direction of the magnetic field is parallel to the wire, by straightening the wire and making it perpendicular to the clamp-shaped detection mechanism 2, the effect of the magnetic induction coil 12 cutting the magnetic force lines is better, and the generated induced current is also stronger, thereby improving the detection accuracy.

Working principle of the present invention: when in use, most of the electrical equipment will be concentrated inside a box, so that there are several wires inside the box that are energized and release magnetic fields. When the current directions in two parallel current-carrying straight wires are the same, the magnetic fields they generate in the area between the two wires are in the same direction, so the magnetic field strength is enhanced; in the area outside the two wires, since the magnetic field directions are opposite, the magnetic field strength is weakened. If the current directions in the two wires are opposite, the magnetic field in the middle area will be weakened, while the magnetic field in the outer area will be enhanced, resulting in that when one of the wires is detected, the magnetic field emitted by the remaining wires will interfere with the measurement structure. At this time, according to the flow direction of the remaining wires, by rotating the cover 17 Pull the two magnetic isolation shells 15 outward from the clamp-shaped detection mechanism 2, compress the magnetic isolation spring 18, and rotate the rotating cover 17 to make the magnetic isolation shell 15 parallel to the external wire to be inspected, and slide the rotating cover 17. The sliding of the rotating cover 17 drives the rotating block 16 to slide. The sliding of the rotating block 16 drives the sliding block 14 to slide inside the sliding plate 13. The sliding of the sliding block 14 drives the magnetic isolation shell 15 to slide, and slide the magnetic isolation shell 15 between the external wire and the wire to be measured. At this time, release the rotating cover 17, so that the opposite side of the two magnetic isolation shells 15 abuts against the outside of the ammeter 1, thereby separating the magnetic field of the external wire from the magnetic field of the wire to be measured, thereby improving the detection accuracy. When the wire needs to be detected, first First, press the drive button 22 to compress the drive spring 23, and the drive button 22 slides inside the drive shell 21. The sliding of the drive button 22 drives the sliding of the drive bar 24. The sliding of the drive bar 24 drives the two drive gears 26 to rotate. The rotation of the two drive gears 26 drives the driving shaft 25 to rotate. The rotation of the two driving shafts 25 drives the two drive plates 27 to rotate. The two drive plates 27 rotate and abut against the left clamp shell 7 and the right clamp shell 8, so that the left clamp shell 7 and the drive mechanism 5 rotate around the rotating shaft 19, and the left clamp shell 7 is separated from the right clamp shell 8, and the wire to be detected can be inserted into the inside of the ammeter 1. After the wire to be detected is inserted into the inside of the ammeter 1, release the drive button 2. 2, the driving spring 23 is extended, the driving button 22 slides in the opposite direction inside the driving shell 21, and drives the driving bar 24 to slide, the sliding of the driving bar 24 drives the driving gear 26 to slide, the sliding of the driving gear 26 drives the driving shaft 25 to rotate, so that the two driving plates 27 are separated from the ammeter 1, and at the same time the clamping spring 20 is extended, and the two ends of the left clamp shell 7 and the right clamp shell 8 are abutted, so that the two ends of the two iron cores 11 are abutted. More specifically, the limit of the rotation of the driving shaft 25 is 90°, so that when the driving button 22 is pressed, the two ends of the two driving plates 27 are respectively abutted against the opposite sides of the left clamp shell 7 and the right clamp shell 8, so that the rotation angles of the left clamp shell 7 and the right clamp shell 8 around the rotating shaft 19 are equal.

When the wire to be detected is fixed at the center of the ammeter 1 and the wire is straightened, the driving button 22 is pressed to separate the left clamp housing 7 from the right clamp housing 8. At the same time, the driving shaft 25 rotates to drive the two driving wire rollers 36 to rotate. The two driving wire rollers 36 rotate to pull the pull wire 35 and wrap the pull wire 35 around the outside of the driving wire roller 36. The movement of the pull wire 35 drives the corresponding three driving wires 33 to move. The movement of the three driving wires 33 drives the telescopic spring 34 inside the sliding sleeve 30 to be compressed. At the same time, the sliding rod 31 retracts inside the sliding sleeve 30. The retraction of the sliding sleeve 30 drives the roller 32 to move, so that the central space of the clamp detection mechanism 2 gradually becomes larger, and wires of different diameters can be placed inside. At the same time, since two of the rollers 32 are parallel to the opening position of the clamp detection mechanism 2, after the wire is placed inside the clamp detection mechanism 2 from the opening position, the outside of the two rollers 32 parallel to the opening position of the clamp detection mechanism 2 touches, and the driving button 22 is released at this time. , driving the wire roller 36 to rotate in the opposite direction, the telescopic spring 34 stretches, and the outsides of the six rollers 32 are all in contact with the outside of the wire, so that the wire is fixed during the closing process of the clamp detection mechanism 2 and fixed at the center of the clamp detection mechanism 2, ensuring that the magnetic field is evenly distributed, so that the induced current is more accurate, and the measurement accuracy is improved. More specifically, the fixing mechanism 4 is arranged on both sides of the clamp detection mechanism 2, so that the middle detection position of the clamp detection mechanism 2 will not be affected, thereby improving the detection accuracy of the wire. At the same time, since a wedge block is fixedly connected to one side of the sliding sleeve 30, after the fixing mechanism 4 fixes the wire at the center of the clamp detection mechanism 2, the telescopic spring 34 inside the sliding sleeve 30 continues to stretch, so that the fixing mechanisms 4 on both sides extend in a direction of separation, thereby straightening the wire. If the plane of the magnetic induction coil 12 is perpendicular to the direction of the magnetic field, the magnetic induction coil 12 has a better effect of cutting the magnetic lines of force, and the generated induced current is also stronger. On the contrary, if the plane of the magnetic induction coil 12 is parallel to the direction of the magnetic field, almost no induced current will be generated. At the same time, since the direction of the magnetic field is parallel to the conductive wire, the conductive wire can be straightened and made perpendicular to the clamp-shaped detection mechanism 2, so that the magnetic induction coil 12 can cut the magnetic lines of force better and generate a stronger induced current, thereby improving the detection accuracy.

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 (4)

1. The utility model provides a non-contact electric current detection device of building fire-fighting equipment which characterized in that: comprising the steps of (a) a step of,

An ammeter (1) for detecting a wire without directly contacting the bare wire or breaking the circuit;

The clamp-on detection mechanism (2), the clamp-on detection mechanism (2) is used for inducing an electric field generated after a wire is electrified, rotating shafts (19) are fixedly connected to the inner two sides of the ammeter (1), the clamp-on detection mechanism (2) is rotationally connected to the outer portion of the rotating shafts (19), the clamp-on detection mechanism (2) comprises a left clamp shell (7) and a right clamp shell (8) which are rotationally connected to the outer portion of the rotating shafts (19), iron cores (11) are fixedly installed in the left clamp shell (7) and the right clamp shell (8), magnetic induction coils (12) are wound on the outer portion of each iron core (11), and two ends of each iron core (11) are arranged in a zigzag mode, and two ends of each iron core (11) are in butt joint with each other;

The outside of pincerlike detection mechanism (2) is all connected with magnetism isolating mechanism (3) in a sliding way, magnetism isolating mechanism (3) is used for shielding the magnetic field generated by the external lead of pincerlike detection mechanism (2) in the process of detecting the current of the middle lead of pincerlike detection mechanism (2), detection precision is improved, fixing mechanisms (4) are fixedly connected to two sides of pincerlike detection mechanism (2), and the fixing mechanisms (4) are used for fixing the detected lead in the middle of pincerlike detection mechanism (2) to improve detection precision;

The fixed mechanism (4) comprises first fixed plates (28) which are respectively and fixedly arranged on two sides of a left clamp shell (7) and a right clamp shell (8), second fixed plates (29) are fixedly arranged on two inner sides of the ammeter (1), sliding sleeves (30) are fixedly connected to one sides of the second fixed plates (29) and the first fixed plates (28) in a rotating mode, sliding grooves are formed in the sliding sleeves (30), sliding rods (31) are fixedly connected to the inner parts of the sliding sleeves (30) in a sliding mode, one end of each sliding rod (31) is rotatably connected with a roller (32), two telescopic springs (34) are arranged in the sliding sleeves (30), the two telescopic springs (34) are symmetrically arranged, the left ends of the two telescopic springs (34) are fixedly connected with the bottoms of the sliding rods (31), the right ends of the two telescopic springs (34) are fixedly connected with one inner sides of the sliding sleeves (30), driving wires (33) are fixedly connected to the bottoms of the sliding rods (31), and extend to the driving wires (33) to the inner sides of the sliding sleeves (30) and are fixedly connected with one end of the same driving wire (35) on the inner side of the first fixed plate (28);

The driving mechanism (5), the driving mechanism (5) is fixedly connected to one inner side of the ammeter (1), the driving mechanism (5) is linked with the clamp-on detection mechanism (2) and the fixing mechanism (4), the driving mechanism (5) is used for driving the clamp-on detection mechanism (2) to move, meanwhile, the fixing and straightening of the wire by the fixing mechanism (4) are controlled, the driving mechanism (5) comprises a driving shell (21) fixedly arranged on one side of the ammeter (1), a driving button (22) is slidingly connected to the inside of the driving shell (21), a driving strip (24) is fixedly connected to one side of the driving button (22), the driving strip (24) extends to the outside of the driving shell (21), a driving spring (23) is arranged in the driving shell (21), one end of the driving spring (23) is fixedly connected with one side of the driving button (22), the other end of the driving spring (23) is fixedly connected with one inner side of the driving shell (21), the driving spring (23) is sleeved on the driving shell (24) and the outside of the driving strip (24) in the driving shell (21) is meshed with one side of the driving strip (24);

The utility model discloses a drive rotary table, including driving rotary table (1), driving rotary table (25)'s outside fixedly connected with driving gear (26), driving gear (26) are provided with two, and are symmetrical arrangement, and two driving gear (26) all mesh with the meshing tooth of drive strip (24) one side, driving rotary table (25)'s outside fixedly connected with drive plate (27), drive plate (27) are provided with two, and are symmetrical arrangement, and two drive plates (27) all with corresponding left pincers shell (7) and right pincers shell (8) looks adaptation, the opposite one side of left side pincers shell (7) and right pincers shell (8) is provided with clamping spring (20), one side and one side fixed connection of left side pincers shell (7) of clamping spring (20), the opposite side and one side fixed connection of right side pincers shell (8) of clamping spring (20).

2. The non-contact current detection device for a fire protection apparatus for a building according to claim 1, wherein: the magnetic isolation mechanism (3) comprises a sliding plate (13) fixedly installed on one side, away from the left clamp shell (7) and the right clamp shell (8), a sliding block (14) is connected to the inner portion of the sliding plate (13) in a sliding mode, a magnetic isolation shell (15) is connected to the outer portion of the sliding block (14) in a sliding mode, a rotating block (16) is installed on the top end of the sliding block (14) in a rotating mode, a rotating cover (17) is installed on the top end of the rotating block (16) in a rotating mode, the bottom of the rotating cover (17) is fixedly connected with the top of the magnetic isolation shell (15), a magnetic isolation spring (18) is sleeved on the outer portion of the sliding block (14), the top of the magnetic isolation spring (18) is in butt joint with the inner top of the rotating cover (17), and the inner portion of the magnetic isolation shell (15) is matched with the outer portion of the corresponding left clamp shell (7) and the right clamp shell (8) respectively.

3. The non-contact current detection device for a fire protection apparatus for a building according to claim 2, wherein: the magnetic isolation mechanism (3) further comprises a magnetic isolation box (9) fixedly installed inside the left clamp shell (7) and the right clamp shell (8), the magnetic isolation box (9) is made of iron, an isolation box (10) is fixedly installed inside the magnetic isolation box (9), an iron core (11) is fixedly installed inside the isolation box (10), and an isolation cavity is formed between the inner side of the magnetic isolation box (9) and the outer side of the isolation box (10).

4. The non-contact current detection device for a fire protection apparatus for a building according to claim 1, wherein: the outside fixedly connected with drive rolling tube (36) of drive pivot (25), drive rolling tube (36) are provided with two and are symmetrical arrangement, act as go-between (35) run through axis of rotation (19) and twine in the outside of drive rolling tube (36), the one end fixed connection of act as go-between (35) is in the outside of drive rolling tube (36).