A current transformer for motor current collection and data monitoring and processing method

Abstract

The present invention discloses a current transformer for motor current collection and a data monitoring and processing method, which relates to the field of inductance technology, including an upper shell, a lower shell, an iron core assembly, a locking assembly, a vibration-absorbing assembly, a rubber pad, an elastic hook, etc. The two ends of the iron core assembly adopt a serrated structure to increase the contact friction and enhance the connection tightness, so that the two butted iron core assemblies become a closed whole; the locking assembly uses the self-locking principle, and on the basis of facilitating quick disassembly and assembly, through the buffering of the rubber pad, the upper and lower parts of the transformer are tightly buckled together, and the rubber pad can play a waterproof and dustproof effect; a rotatable and adjustable vibration-absorbing assembly is adopted, and the motors of different specifications and models are adapted by setting the rotation angle to obtain the best vibration absorption effect; an elastic hook is adopted to facilitate the hanging, winding or bundling of the wires of the motor to be tested.

Description

Technical Field

[0001] The present invention relates to the field of inductance technology, and in particular to a current transformer for motor current collection and a data monitoring and processing method. Background Art

[0002] For large-scale factories related to the manufacturing industry, dozens or even hundreds of motors are needed on site. The safe and normal operation of these motors is crucial to the entire production and manufacturing work. At present, the main method used is manual regular inspection, which is time-consuming, labor-intensive, and lacks precision. Therefore, it is necessary to establish a set of motor maintenance standards based on the real-time collection of current data during daily operation of the motor, and dynamically monitor the operating status of the motor. When the cumulative running time of the motor is greater than a certain time, an early warning will remind the staff to go for maintenance.

[0003] Based on the above ideas, without destroying the existing electrical connection system of the motor, it is best to use a current transformer as the core device for motor current collection, and it is necessary to use an open-type current transformer that can be directly installed on the motor power line.

[0004] At present, there are two main types of open-close current transformers: half-open and full-open. For half-open current transformers, such as the patent with announcement number CN220963018U, its structure adopts a hinged one side and a flexible buckle on the other side. For full-open current transformers, such as the patent with announcement number CN219936786U, its structure adopts a double-sided spring buckle. The above two current transformers have one thing in common, that is, the iron core is divided into two parts, and the winding is only set on the iron core of the lower half, and the iron core of the upper half is not wound with windings. The above two current transformers mainly have the following technical problems:

[0005] (1) The buckle is prone to aging and wear, which may cause the structure to become loose, the connection to fail, and poor contact between the two halves of the core.

[0006] (2) There is a problem of poor sealing at the contact part of the upper and lower half cores. Daily use and opening and closing easily cause dust accumulation, resulting in poor contact between the two halves of the core;

[0007] (3) When used in the field of motor measurement, it is greatly affected by mechanical vibration. The existing structure is prone to aging and loosening, which affects the long-term monitoring effect. Summary of the invention

[0008] The purpose of the present invention is to provide a current transformer for motor current collection, which can be completely separated, is easy to disassemble and assemble quickly, has good contact effect, good sealing effect, prevents the influence of mechanical vibration and is easy to organize the measured wires, and proposes a motor current data monitoring and processing method based on the current transformer.

[0009] In view of the above technical problems, the technical solution adopted by the present invention is: a current transformer for motor current collection, comprising an upper shell, a lower shell, an iron core assembly, a locking assembly, a vibration-absorbing assembly, a rubber pad, a socket, an elastic hook, a protective cover, and a terminal block; there are two groups of locking assemblies, each group of locking assemblies is connected to the upper shell and the lower shell; the upper shell is detachably fixed on the lower shell by two groups of locking assemblies, and the locking assembly locks the upper shell and the lower shell by the self-locking principle; three iron core assemblies are fixedly installed in each of the upper shell and the lower shell; the two ends of each iron core assembly are serrated; when the upper shell is fixedly installed on the lower shell, the six iron core assemblies form a mutual inductance unit in pairs, and the two iron core assemblies in each mutual inductance unit are in end-to-end bite contact; the lower shell rotates Two groups of vibration-absorbing components are installed; a rubber pad is fixedly installed on each of the upper shell and the lower shell; when the upper shell is fixedly installed on the lower shell, the two rubber pads fit tightly; each mutual inductance unit is hollow and is used to pass through or wrap around the wire to be tested; a plurality of sockets evenly distributed around the circumference are fixedly installed in the hollow spaces of the three mutual inductance units formed by the upper shell and the lower shell; an elastic hook is inserted in each socket; the elastic hook can be manually bent into a shape structure and is used to hang or support the wire to be tested; four wiring terminals are fixedly installed on the lower shell respectively; the first three wiring terminals are each electrically connected to the positive pole of a mutual inductance unit; the negative poles of the three mutual inductance units are electrically connected to the fourth wiring terminal in common; the protective cover is hinged on the lower shell; the protective cover is used to cover the four wiring terminals.

[0010] Preferably, the upper shell is composed of an upper half shell 1 and an upper half shell 2; the upper half shell 1 and the upper half shell 2 are fixedly connected; and a first plug hole is respectively provided at both ends of the upper shell.

[0011] Preferably, the lower shell body is composed of lower half shell one and lower half shell two; lower half shell one and lower half shell two are fixedly connected; two supporting feet are respectively provided on lower half shell one and lower half shell two; two groups of sleeves, two groups of slide grooves, two groups of second jacks and three pairs of wire holes are also provided in the lower shell body; two third jacks, two fourth jacks and two fifth jacks are provided on lower half shell one; a wiring groove is provided on lower half shell two; the wiring groove is used to install wiring terminals and protective covers.

[0012] Preferably, two groups of first clamping seats and two groups of second clamping seats are respectively arranged in the installation space of each mutual inductance unit formed by the upper shell and the lower shell; the first clamping seats and the second clamping seats are used for clamping the iron core assembly.

[0013] Preferably, the core assembly includes short silicon steel sheets, long silicon steel sheets, gauze, insulating paper, enameled wire, and positioning blocks; the number of short silicon steel sheets is the same as that of long silicon steel sheets; multiple short silicon steel sheets and long silicon steel sheets are stacked together, and each short silicon steel sheet is only in contact with the long silicon steel sheets, and each long silicon steel sheet is only in contact with the short silicon steel sheets; a layer of gauze is wrapped around the outside of the outermost short silicon steel sheets and long silicon steel sheets; a layer of insulating paper is wrapped around the outside of the gauze; enameled wire is wrapped around the outside of the insulating paper; positioning blocks are provided in the middle of the short silicon steel sheets and the long silicon steel sheets; the positioning blocks are used for positioning and snapping onto the second holder.

[0014] Preferably, the core assembly further includes a pair of pins or a pair of sockets; a section of enameled wire is wound around the core assembly located on the upper shell, and both ends of the section of enameled wire are electrically connected to a pin respectively, and the two pins are fixedly mounted on the upper shell; two sections of enameled wire are wound around the core assembly located on the lower shell, and the first ends of the two sections of enameled wire are electrically connected to a socket respectively, and the second ends of the two sections of enameled wire are used to pass through the threading hole to electrically connect to the terminal, and the two sockets are fixedly mounted on the lower shell; the pin is used to insert into the socket; each mutual inductance unit contains a pair of pins and a pair of sockets.

[0015] Preferably, in the core assembly, the protruding length of the end of the long silicon steel sheet relative to the end of the short silicon steel sheet is h, and the outer diameter of the long silicon steel sheet or the short silicon steel sheet is D, then 0.015D≤h≤0.025D.

[0016] Preferably, the lock assembly includes a locking knob, a locking slide, a locking pin, a first spring, a push pin, and a second spring; a hollow shaft with a notch is provided on the locking knob; the locking knob is hinged on the fourth socket through the hollow shaft; there are two forms of the locking knob, namely, the two locking knobs hinged on the two fourth sockets are mirror images of each other in structure; a helical surface is provided on the locking knob, and the helical rise angle of the helical surface is not greater than 10°; a notch for making way is also provided on the locking knob; the locking slide is composed of a first button, a first slide rod, a slide rack and two first wedges; the first slide rod is slidably installed in the third socket; the slide rack is slidably installed in the slide groove; the second spring is sleeved on the first slide rod; the two ends of the second spring are respectively in contact with the first button and the lower half shell; the two first A wedge block is located on both sides of the slide; each first wedge block is provided with a large wedge surface 1 and a small wedge surface 1; the locking pin is composed of a second button, a second slide bar, a third slide bar and a second wedge block; the second slide bar is slidably installed in the first socket; the third slide bar is detachably slidably installed in the second socket; the second wedge block is arranged at the end of the third slide bar; the second wedge block is provided with a large wedge surface 2 and a small wedge surface 2; the large wedge surface 2 is used for sliding contact and cooperation with the large wedge surface 1; the small wedge surface 2 is used for sliding contact and cooperation with the small wedge surface 1; the inclination of the large wedge surface 1 is between 40° and 50°; the inclination of the small wedge surface 1 does not exceed 10°; the ejector pin is slidably installed in the sleeve; the first end of the ejector pin contacts and cooperates with the bottom of the second wedge block; a first spring is installed in the space surrounded by the second end of the ejector pin and the sleeve.

[0017] Preferably, the vibration-damping assembly includes a positioning knob, a locking screw, a vibration-damping chamber, and a vibration-damping block; the vibration-damping chamber is hinged in the fifth socket; the positioning knob is fixedly mounted on the vibration-damping chamber; the locking screw is mounted on the positioning knob; a vibration-damping block is mounted in the space enclosed by the vibration-damping chamber and the lower half shell two; the maximum length of the vibration-damping block is H, and the gap distance between the vibration-damping block and the vibration-damping chamber or the lower half shell two is d, then 0.03H≤d≤0.06H; the locking screw is mounted on the positioning knob along the maximum length direction of the vibration-damping block; a pair of orthogonally connected vibration-damping holes one and two are respectively arranged on both sides in the length direction of the vibration-damping block.

[0018] Preferably, the present invention further proposes a data monitoring and processing method based on the current transformer for motor current acquisition, and the specific method steps are as follows:

[0019] Step S1: installing a current transformer and determining the number of winding turns of the wire to be tested according to the rated current parameter of the motor to be tested;

[0020] Step S2: connecting the current transformer via the current collector, and transmitting the induced current data of the current transformer to the computer via wired or wireless transmission;

[0021] Step S3: Establish an online data table on the computer to record the rated current, measured running time and converted measured current data of each current transformer corresponding to the motor to be tested, and record once every 100ms;

[0022] Step S4: Calculate the influence coefficient, influence coefficient = (measured current value / rated current value) 2 ;

[0023] Step S5: Calculate the cumulative equivalent running time, the cumulative equivalent running time = ∑ influence coefficient × measured running time;

[0024] Step S6: When the accumulated equivalent running time is greater than 3000 hours, an alarm message pops up to remind the staff to perform maintenance on the corresponding monitored motor.

[0025] Compared with the prior art, the present invention has the following beneficial effects: (1) The two ends of the core assembly adopt a serrated structure to increase the contact friction and enhance the connection tightness, so that the two butted core assemblies become a closed whole; (2) The lock assembly utilizes the self-locking principle, and on the basis of being easy to quickly disassemble and assemble, through the cushioning of the rubber pad, the upper and lower parts of the transformer are tightly buckled together; (3) Two rubber pads are used to provide elastic buffering for the lock assembly on the one hand, so that even if the contact part of the lock assembly is worn out due to long-term use, it can still be tightly buckled. At the same time, with the pre-tightening force provided by the lock assembly, it has a waterproof and dustproof effect; (4) A rotatable and adjustable vibration absorption assembly is used, and by setting the rotation angle, it is adapted to motors of different specifications and models to obtain the best vibration absorption effect; (5) An elastic hook is used to facilitate the hanging, winding or bundling of the wires of the motor to be tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the overall structure of the present invention Figure 1 .

[0027] Figure 2 Schematic diagram of the overall structure of the present invention Figure 2 .

[0028] Figure 3 Schematic diagram of the overall structure of the present invention Figure 3 .

[0029] Figure 4 It is a schematic diagram of the overall structure of the present invention.

[0030] Figure 5 Schematic diagram of the disassembly of the upper shell and the lower shell of the present invention Figure 1 .

[0031] Figure 6 Schematic diagram of the disassembly of the upper shell and the lower shell of the present invention Figure 2 .

[0032] Figure 7 It is a schematic diagram of the internal stacking structure of the core assembly of the present invention.

[0033] Figure 8 It is a structural cross-sectional view of the core assembly of the present invention.

[0034] Fig. 9 It is the wiring principle diagram of the enameled wire of the present invention.

[0035] Fig.10 It is a structural cross-sectional view of the lock assembly of the present invention.

[0036] Fig.11 The structure of the lock assembly of the present invention is shown in FIG. Figure 1 .

[0037] Fig.12 The structure of the lock assembly of the present invention is shown in FIG. Figure 2 .

[0038] Fig.13 It is a schematic diagram of the parts structure of the locking knob of the present invention.

[0039] Fig.14 It is a schematic diagram of the parts structure of the locking slide plate of the present invention.

[0040] Fig.15 It is a schematic diagram of the parts structure of the locking bolt of the present invention.

[0041] Fig.16 It is a structural cross-sectional view of the vibration-absorbing assembly of the present invention.

[0042] Fig.17 The structure of the vibration reduction assembly of the present invention is shown in FIG. Figure 1 .

[0043] Fig.18 The structure of the vibration reduction assembly of the present invention is shown in FIG. Figure 2 .

[0044] Fig.19 It is a schematic diagram of the parts structure of the vibration-absorbing block of the present invention.

[0045] Fig. 20 This is a flow chart of the data monitoring and processing method of the present invention.

[0046] In the figure: 1-upper shell; 2-lower shell; 3-iron core assembly; 4-lock assembly; 5-vibration damping assembly; 6-rubber pad; 7-socket; 8-elastic hook; 9-protective cover; 10-terminal; 11-first card holder; 12-second card holder; 101-upper half shell 1; 102-upper half shell 2; 103-first jack; 201-lower half shell 1; 202-lower half shell 2; 203-support foot ; 204-sleeve; 205-slide; 206-second jack; 207-threading hole; 208-third jack; 209-fourth jack; 210-fifth jack; 211-wiring slot; 301-short silicon steel sheet; 302-long silicon steel sheet; 303-gauze; 304-insulating paper; 305-enameled wire; 306-pin; 307-sleeve; 308-positioning block; 401-locking Knob; 402-locking slide plate; 403-locking latch; 404-first spring; 405-thimble; 406-second spring; 40101-spiral surface; 40102-notch; 40103-hollow shaft; 40104-notch; 40201-first button; 40202-first slide bar; 40203-slide; 40204-first wedge; 40205-large wedge Surface one; 40206-small wedge surface one; 40301-second button; 40302-second slide bar; 40303-third slide bar; 40304-second wedge block; 40305-large wedge surface two; 40306-small wedge surface two; 501-adjusting knob; 502-setting screw; 503-vibration damping cavity; 504-vibration damping block; 50401-vibration damping hole one; 50402-vibration damping hole two. DETAILED DESCRIPTION

[0047] The technical solution of the present invention is further illustrated below in conjunction with the accompanying drawings and through specific implementation methods, wherein the accompanying drawings are only used for exemplary descriptions, representing only schematic diagrams rather than actual drawings, and cannot be understood as limitations on this patent; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted.

[0048] Figures 1 to 19 Preferred embodiments of the present invention are presented.

[0049] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, there are two groups of lock components 4, each group of lock components 4 is connected to the upper shell 1 and the lower shell 2; the upper shell 1 is detachably fixedly installed on the lower shell 2 through two groups of lock components 4, and the lock components 4 use the self-locking principle to lock the upper shell 1 and the lower shell 2; three core components 3 are fixedly installed in the upper shell 1 and the lower shell 2; the two ends of each core component 3 are serrated; when the upper shell 1 is fixedly installed on the lower shell 2, the six core components 3 form a mutual inductance unit in pairs, and the two core components 3 in each mutual inductance unit are in end-to-end bite contact; two groups of vibration-absorbing components 5 are rotatably installed in the lower shell 2; a rubber pad 6 is fixedly installed on each of the upper shell 1 and the lower shell 2; the upper shell 1 is fixedly installed on the lower shell 2 When the upper shell 1 and the lower shell 2 are mounted on the housing 2, the two rubber pads 6 fit tightly; each mutual inductance unit is hollow and is used to pass the wire to be tested or to wrap around the wire to be tested; six sockets 7 with uniform distribution of the circumference are fixedly installed in the hollow spaces of the three mutual inductance units formed by the upper shell 1 and the lower shell 2; an elastic hook 8 is inserted in each socket 7; the elastic hook 8 can be manually bent into a shape structure, and is used to hang the wire to be tested or to support the wire to be tested; four wiring terminals 10 are respectively fixedly installed on the lower shell 2; the first three wiring terminals 10 are each electrically connected to the positive pole of a mutual inductance unit; the negative poles of the three mutual inductance units are electrically connected to the fourth wiring terminal 10 in common; the protective cover 9 is hinged on the lower shell 2; the protective cover 9 is used to cover the four wiring terminals 10.

[0050] like Figure 5 and Figure 6 As shown, the housing is composed of an upper half shell 101 and an upper half shell 102; the upper half shell 101 and the upper half shell 102 are fixedly connected; a first plug hole 103 is provided at each end of the upper housing 1; the lower housing 2 is composed of a lower half shell 201 and a lower half shell 202; the lower half shell 201 and the lower half shell 202 are fixedly connected; two legs 203 are provided on the lower half shell 201 and the lower half shell 202 respectively; two sets of sleeves 204, two sets of slide grooves 205, and two sets of second plug holes 103 are also provided in the lower housing 2. Hole 206 and three pairs of threading holes 207; two third jacks 208, two fourth jacks 209 and two fifth jacks 210 are arranged on the lower half shell 1 201; a wiring groove 211 is arranged on the lower half shell 202; the wiring groove 211 is used to install the wiring terminal 10 and the protective cover 9; in the installation space of each mutual inductance unit formed by the upper shell 1 and the lower shell 2, two groups of first clamping seats 11 and two groups of second clamping seats 12 are respectively arranged; the first clamping seat 11 and the second clamping seat 12 are used to clip the iron core assembly 3.

[0051] like Figure 7 , Figure 8 and Fig. 9As shown, in the core assembly 3, the number of short silicon steel sheets 301 and long silicon steel sheets 302 is the same; four short silicon steel sheets 301 and four long silicon steel sheets 302 are stacked together, and each short silicon steel sheet 301 is only in contact with the long silicon steel sheet 302, and each long silicon steel sheet 302 is only in contact with the short silicon steel sheet 301; a layer of gauze 303 is wrapped around the outside of the outermost short silicon steel sheet 301 and the long silicon steel sheet 302; a layer of insulating paper 304 is wrapped around the outside of the gauze 303; an enameled wire 305 is wrapped around the outside of the insulating paper 304; a positioning block 308 is provided in the middle of the short silicon steel sheet 301 and the long silicon steel sheet 302; the positioning block 308 is used for positioning and snapping on the second holder 12; a section of enameled wire 305 is wound around the core assembly 3 located in the upper shell 1, and the two ends of the section of enameled wire 305 are each electrically connected to a pin 306, and the two pins 306 are fixedly installed On the upper shell 1; two sections of enameled wire 305 are wound on the core assembly 3 located on the lower shell 2, the first ends of the two sections of enameled wire 305 are electrically connected to a socket 307 respectively, and the second ends of the two sections of enameled wire 305 are used to pass through the threading hole 207 to electrically connect to the terminal 10, and the two sockets 307 are fixedly installed on the lower shell 2; the pin 306 is used to insert the socket 307; each mutual inductance unit includes a pair of pins 306 and a pair of sockets 307; in particular, assuming that in the core assembly 3, the protruding length of the end of the long silicon steel sheet 302 relative to the end of the short silicon steel sheet 301 is h, and the outer diameter of the long silicon steel sheet 302 or the short silicon steel sheet 301 is D, then 0.015D≤h≤0.025D, in this embodiment, h=1mm, D=49mm; in this embodiment, the number of turns of the enameled wire 305 wound in each mutual inductance unit is 100.

[0052] like Fig.10 , Fig.11 and Fig.12 As shown, in the lock assembly 4, see Fig.13 The locking knob 401 is provided with a hollow shaft 40103 with a notch 40104; the locking knob 401 is hinged on the fourth plug hole 209 through the hollow shaft 40103; the locking knob 401 has two forms, that is, the two locking knobs 401 hinged on the two fourth plug holes 209 are mirror images of each other in structure; the locking knob 401 is provided with a helical surface 40101, and the helical angle of the helical surface 40101 is not greater than 10°, and is 7.5° in this embodiment; the locking knob 401 is also provided with a notch 40102 for making way; see Fig.14The locking slide plate 402 is composed of a first button 40201, a first slide bar 40202, a slide rack 40203 and two first wedge blocks 40204; the first slide bar 40202 is slidably installed in the third plug hole 208; the slide rack 40203 is slidably installed in the slide groove 205; the second spring 406 is sleeved on the first slide bar 40202; the two ends of the second spring 406 are respectively in contact with the first button 40201 and the lower half shell 201; the two first wedge blocks 40204 are located on both sides of the slide rack 40203; each first wedge block 40204 is provided with a large wedge surface 40205 and a small wedge surface 40206; see Fig.15 The locking pin 403 is composed of a second button 40301, a second slide bar 40302, a third slide bar 40303, and a second wedge block 40304; the second slide bar 40302 is slidably installed in the first plug hole 103; the third slide bar 40303 is detachably slidably installed in the second plug hole 206; the second wedge block 40304 is arranged at the end of the third slide bar 40303; the second wedge block 40304 is provided with a large wedge surface 2 40305 and a small wedge surface 2 40306; the large wedge surface 2 40305 is used to contact with the large wedge surface One 40205 is in sliding contact cooperation; small wedge surface two 40306 is used for sliding contact cooperation with small wedge surface one 40206; the inclination of large wedge surface one 40205 is between 40° and 50°, and 45° is taken in this embodiment; the inclination of small wedge surface one 40206 does not exceed 10°, and 10° is taken in this embodiment; the ejector pin 405 is slidably installed in the sleeve 204; the first end of the ejector pin 405 is in contact cooperation with the bottom of the second wedge block 40304; a first spring 404 is installed in the space surrounded by the second end of the ejector pin 405 and the sleeve 204.

[0053] like Fig.16 , Fig.17 and Fig.18 As shown, in the vibration-absorbing assembly 5, the vibration-absorbing chamber 503 is hinged in the fifth jack 210; the adjustment knob 501 is fixedly installed on the vibration-absorbing chamber 503; the set screw 502 is installed on the adjustment knob 501; a vibration-absorbing block 504 is installed in the space enclosed by the vibration-absorbing chamber 503 and the lower half shell 202; the maximum length of the vibration-absorbing block 504 is H, and the gap distance between the vibration-absorbing block 504 and the vibration-absorbing chamber 503 or the lower half shell 202 is d, then 0.03H≤d≤0.06H, in this embodiment, H=16mm, d=0.5mm; the set screw 502 is installed on the adjustment knob 501 along the maximum length direction of the vibration-absorbing block 504; see Fig.19 A pair of orthogonally connected vibration-absorbing holes 1 50401 and 2 50402 are provided on both sides of the vibration-absorbing block 504 in the length direction.

[0054] Fig. 20 A data monitoring and processing method based on a preferred embodiment of the present invention is provided, comprising the following six steps:

[0055] Step S1: installing a current transformer and determining the number of winding turns of the wire to be tested according to the rated current parameter of the motor to be tested;

[0056] Step S2: connecting the current transformer via the current collector, and transmitting the induced current data of the current transformer to the computer via wired or wireless transmission;

[0057] Step S3: Establish an online data table on the computer to record the rated current, measured running time and converted measured current data of each current transformer corresponding to the motor to be tested, and record once every 100ms;

[0058] Step S4: Calculate the influence coefficient, influence coefficient = (measured current value / rated current value) 2 ;

[0059] Step S5: Calculate the cumulative equivalent running time, where the cumulative equivalent running time = ∑ influence coefficient × measured running time;

[0060] Step S6: When the accumulated equivalent running time is greater than 3000 hours, an alarm prompt message pops up to remind the staff to perform maintenance on the corresponding monitored motor.

[0061] The working principle of the present invention is as follows: Fig. 9 As shown, the locking knobs 401 on the left and right sides are mirror images of each other in structure. When in use, Fig. 9 The position relationship will Fig. 9 The locking knobs 401 on the left and right sides are manually rotated from the left and right sides to the middle, that is, the locking knob 401 on the left side is rotated to the right side, and the locking knob 401 on the right side is rotated to the left side, and finally the notch 40102 is directly opposite to the locking plate 402, so that the locking plate 402 can be manually pressed to overcome the elastic force of the second spring 406 and push the locking plate 402; Fig.10As shown, the first buttons 40201 on both sides are pushed with the thumbs of the left and right hands. When the locking slide plate 402 slowly moves to the left in the figure, the first wedge block 40204 and the second wedge block 40304 are gradually separated. Under the action of the first spring 404 and the ejector pin 405, during the separation process of the first wedge block 40204 and the second wedge block 40304, the small wedge surface 1 40206 and the small wedge surface 2 40306 always slide in close contact until the first wedge block 40204 and the second wedge block 40304 are completely separated. Under the action of the first spring 404, the ejector pin 405 automatically pushes the locking latch 403 to move upward, thereby releasing the upper shell 1 and the lower shell. The locking state between the two bodies 2 is realized. At this time, the thumbs of both hands release the first buttons 40201 on both sides, and the elastic restoring force of the second spring 406 will drive the locking slide plate 402 to move right. However, since the ejector pin 405 has moved upward, when the first wedge block 40204 touches the side of the ejector pin 405, the mechanism is locked; further, one hand holds the lower shell 2 and the other hand holds the upper shell 1, and the upper shell 1 and the lower shell 2 are manually pulled apart. During this process, the locking pin 403 is gradually pulled out of the second plug hole 206, the plug pin 306 is gradually pulled out of the plug sleeve 307, and the three upper core assemblies 3 are gradually pulled out of the three lower core assemblies 3.

[0062] When the upper shell 1 and the lower shell 2 are completely separated, the winding method needs to be considered. The current transformer of the present invention is mainly used for current detection and collection of three-phase motors. When the measured wire adopts one turn, it is necessary to decide whether to hook the measured wire in the elastic hook 8 or to be surrounded and supported by six elastic hooks 8 according to the thickness of the wire; when the measured wire adopts multiple turns, it is necessary to consider whether the measured wire is wound on the upper shell 1 or the lower shell 2. Three measured wires can be wound on the upper shell 1 at the same time, or three measured wires can be wound on the lower shell 2 at the same time, or both the upper shell 1 and the lower shell 2 can be wound around the measured wires. The specific method to be adopted needs to be determined according to the actual installation environment. The more efficient and convenient the method adopted, the better.

[0063] After placing the wires to be tested, manually close the upper housing 1 and the lower housing 2. First, align the locking pins 403 on both sides with the second jacks 206 on both sides of the lower housing 2. After the locking pins 403 are inserted into the second jacks 206, slowly press the second button 40301 with both hands. Fig.10 As shown, the second wedge block 40304 gradually moves downward and finally contacts the upper part of the ejector pin 405. When the second wedge block 40304 pushes the ejector pin 405 to overcome the elastic force of the first spring 404 and gradually move downward, it gradually contacts the first wedge block 40204, so that the large wedge surface 2 40305 fits the large wedge surface 1 40205. Since the inclinations of the large wedge surface 2 40305 and the large wedge surface 1 40205 are both 45° in this embodiment, self-locking will not occur. During the sliding process of the large wedge surface 2 40305 relative to the large wedge surface 1 40205, the locking slide plate 402 will be driven to overcome the elastic force of the second spring 406 and move upward. Fig.10 The locking plate 402 is automatically moved to the left side until the second large wedge surface 40305 is completely separated from the first large wedge surface 40205. Fig.10 The first and second wedge surfaces 40206 and 40306 are pressed against each other to form a locking mechanism, and the locking member 403 is pressed against the second wedge surface 40206. The second wedge surface 40206 is pressed against the second wedge surface 40306 to form a locking mechanism. Fig. 9 The locking knobs 401 on the left and right sides are manually rotated from the middle to the left and right sides, that is, the locking knob 401 on the left is rotated to the left, and the locking knob 401 on the right is rotated to the right, so that the spiral surface 40101 is finally close to the first button 40201. Since the contact angle between the spiral surface 40101 and the first button 40201 is smaller than the friction angle, self-locking is formed, so that the locking knob 401 locks the locking slide 402; since the rubber pad 6 has a certain elasticity, by adjusting the locking force of the locking knob 401, a large pre-tightening force can still be obtained when the first wedge block 40204 and the second wedge block 40304 are worn out after long-term use, thereby ensuring the stable connection of the core assembly 3 in each mutual inductance unit.

[0064] After the above operations, the device is fixedly mounted on the mounting table of the motor to be tested through the four legs 203; then the wiring terminals 10 are connected to the current collector, and then the monitoring test operation is carried out. During the operation, the hand is placed on the upper shell 1 to feel the vibration, and then the fixing screws 502 in the two vibration-absorbing components 5 are loosened, and then the adjustment knobs 501 are rotated to adjust the angle of the vibration-absorbing components 5. After each adjustment, the fixing screws 502 need to be tightened to make the fixing screws 502 close to the lower half shell 201 to lock the phase angle of the vibration-absorbing component 5. After each locking, it is necessary to manually feel the vibration of the mutual inductor until the adjustment is stopped after no obvious vibration is felt; Fig.17 As shown, the set screw 502 is arranged in the maximum length direction of the vibration-damping block 504. By visually observing the angular position of the set screw 502, the main moving vibration direction of the vibration-damping block 504 can be known; further, in this embodiment, the vibration-damping block 504 adopts a quadrangular prism structure, and is provided with two groups of mutually orthogonal and connected vibration-damping holes 1 50401 and vibration-damping holes 2 50402. This structural arrangement enables the vibration-damping block 504 to better consume vibration energy through air turbulence when moving in the vibration-damping cavity 503.

[0065] After all the above operations are completed, the motor operation data monitoring and processing phase is entered. In this embodiment, it is assumed that the rated current of the motor to be tested is I 0, the value of the influence coefficient of the nth group is λ n , No. n The actual current value collected by the group is I 1n , then:

[0066] Since the current data is collected every 100ms, n The cumulative equivalent running time of acquisitions is T (Unit: hours), then:

[0067] when T When the value is greater than 3000, an alarm message will pop up to remind the staff to perform maintenance on the corresponding monitored motor.

Claims

1. A current transformer for motor current collection, comprising an upper housing (1), a lower housing (2), an iron core assembly (3), a locking assembly (4), a vibration-absorbing assembly (5), a rubber pad (6), a socket (7), an elastic hook (8), a protective cover (9), and a wiring terminal (10), characterized in that: There are two groups of lock components (4), each group of lock components (4) is connected to the upper shell (1) and the lower shell (2); the upper shell (1) is detachably fixedly mounted on the lower shell (2) through the two groups of lock components (4), and the lock components (4) lock the upper shell (1) and the lower shell (2) by using the self-locking principle; three iron core components (3) are fixedly mounted in each of the upper shell (1) and the lower shell (2); the two ends of each iron core component (3) are serrated; when the upper shell (1) is fixedly mounted on the lower shell (2), the six iron core components (3) form a mutual inductance unit in pairs, and the two iron core components (3) in each mutual inductance unit are in end-to-end bite contact; two groups of vibration damping components (5) are rotatably mounted in the lower shell (2); the upper shell (1) and the lower shell ( 2) are each fixedly mounted with a rubber pad (6); when the upper shell (1) is fixedly mounted on the lower shell (2), the two rubber pads (6) fit tightly; each mutual inductance unit is hollow and is used to pass through or wrap around the wire to be tested; a plurality of sockets (7) evenly distributed around the circumference are each fixedly mounted in the hollow spaces of the three mutual inductance units formed by the upper shell (1) and the lower shell (2); each socket (7) is inserted with an elastic hook (8); the elastic hook (8) is a manually bendable structure and is used to hang or support the wire to be tested; four wiring terminals (10) are respectively fixedly mounted on the lower shell (2); the first three wiring terminals (10) are each electrically connected to the positive pole of a mutual inductance unit; the negative poles of the three mutual inductance units are electrically connected to the fourth wiring terminal; The protective cover (9) is hinged on the lower shell (2); the protective cover (9) is used to cover the four wiring terminals (10); a first plug hole (103) is provided at each end of the upper shell (1); the lower shell (2) is composed of a lower half shell (201) and a lower half shell (202); the lower half shell (201) and the lower half shell (202) are fixedly connected; two legs (203) are provided on the lower half shell (201) and the lower half shell (202); two sets of sleeves (204), two sets of slide grooves (205), two sets of second plug holes (206) and three pairs of threading holes (207) are also provided in the lower shell (2); two third plug holes (208), two fourth plug holes (209) and three pairs of threading holes (201) are provided on the lower half shell (201); 209) and two fifth jacks (210); the core assembly (3) comprises a short silicon steel sheet (301), a long silicon steel sheet (302), gauze (303), insulating paper (304), enameled wire (305), and a positioning block (308); the number of the short silicon steel sheets (301) and the long silicon steel sheets (302) is the same; a plurality of short silicon steel sheets (301) and long silicon steel sheets (302) are stacked together, and each short silicon steel sheet (301) is only in contact with a long silicon steel sheet (302), and each long silicon steel sheet (302) is only in contact with a short silicon steel sheet (301); a layer of gauze (303) is wrapped around the outside of the outermost short silicon steel sheet (301) and the long silicon steel sheet (302); a layer of insulating paper (304) is wrapped around the outside of the gauze (303);An enameled wire (305) is wound around the outside of the insulating paper (304); a positioning block (308) is provided in the middle of the short silicon steel sheet (301) and the long silicon steel sheet (302); the iron core assembly (3) further comprises a pair of plug pins (306) or a pair of plug sleeves (307); a section of enameled wire (305) is wound around the iron core assembly (3) located on the upper shell (1), and the two ends of the section of enameled wire (305) are respectively electrically connected to a plug pin (306), and the two plug pins (306) are fixedly mounted on the upper shell (1); two sections of enameled wire (305) are wound around the iron core assembly (3) located on the lower shell (2), and the first ends of the two sections of enameled wire (305) are respectively electrically connected to a plug sleeve (307), and the second ends of the two sections of enameled wire (305) are used to pass through the threading hole. (207) is electrically connected to the terminal block (10), and two sockets (307) are fixedly mounted on the lower housing (2); the pin (306) is used to insert the socket (307); each mutual inductance unit includes a pair of pins (306) and a pair of sockets (307); in the core assembly (3), the protruding length of the end of the long silicon steel sheet (302) relative to the end of the short silicon steel sheet (301) is h, and the outer diameter of the long silicon steel sheet (302) or the short silicon steel sheet (301) is D, then 0.015D≤h≤0.025D; the lock assembly (4) includes a locking knob (401), a locking slide plate (402), a locking pin (403), a first spring (404), a pin (405), and a second spring (406); the locking knob (401) is provided with A hollow rotating shaft (40103) with a notch (40104) is provided; the locking knob (401) is hinged on the fourth plug hole (209) through the hollow rotating shaft (40103); the locking knob (401) has two forms, that is, the two locking knobs (401) hinged on the two fourth plug holes (209) are mirror images of each other in structure; a helical surface (40101) is provided on the locking knob (401), and the helical angle of the helical surface (40101) is not greater than 10°; the locking knob (401) is also provided with a notch (40102) for making way; the locking slide plate (402) is composed of a first button (40201), a first slide rod (40202), a slide frame (40203) and two first wedge blocks (40204) The invention relates to a locking bolt (40301) and a locking bolt (40302) comprising: a first sliding rod (40202) slidably mounted in a third plug hole (208); a sliding frame (40203) slidably mounted in a sliding groove (205); a second spring (406) sleeved on the first sliding rod (40202); two ends of the second spring (406) respectively contact and cooperate with a first button (40201) and a lower half shell (201); two first wedge blocks (40204) are located on both sides of the sliding frame (40203); each first wedge block (40204) is provided with a large wedge surface (40205) and a small wedge surface (40206); and the locking bolt (403) is composed of a second button (40301), a second sliding rod (40302), a third sliding rod (40303), and a second wedge block (40304);The second slide bar (40302) is slidably mounted in the first plug hole (103); the third slide bar (40303) is detachably slidably mounted in the second plug hole (206); the second wedge block (40304) is arranged at the end of the third slide bar (40303); the second wedge block (40304) is provided with a large wedge surface 2 (40305) and a small wedge surface 2 (40306); the large wedge surface 2 (40305) is used for sliding contact with the large wedge surface 1 (40205); the small wedge surface The second wedge block (40306) is used for sliding contact with the small wedge surface (40206); the slope of the large wedge surface (40205) is between 40° and 50°; the slope of the small wedge surface (40206) does not exceed 10°; the ejector pin (405) is slidably installed in the sleeve (204); the first end of the ejector pin (405) is in contact with the bottom of the second wedge block (40304); a first spring (404) is installed in the space surrounded by the second end of the ejector pin (405) and the sleeve (204). ; 2. A current transformer for motor current collection as claimed in claim 1, characterized in that: The upper shell (1) is composed of an upper half shell one (101) and an upper half shell two (102); the upper half shell one (101) and the upper half shell two (102) are fixedly connected.

3. A current transformer for motor current collection as claimed in claim 2, characterized in that: A wiring slot (211) is provided on the second lower half shell (202); the wiring slot (211) is used to install the wiring terminal (10) and the protective cover (9).

4. A current transformer for motor current collection as claimed in claim 3, characterized in that: Two groups of first clamping seats (11) and two groups of second clamping seats (12) are arranged in the installation space of each mutual inductance unit formed by the upper shell (1) and the lower shell (2); the first clamping seats (11) and the second clamping seats (12) are used to clamp the iron core assembly (3); and the positioning block (308) is used to position and clamp on the second clamping seat (12).

5. A current transformer for motor current collection as claimed in claim 4, characterized in that: The vibration-damping assembly (5) comprises a positioning knob (501), a set screw (502), a vibration-damping chamber (503), and a vibration-damping block (504); the vibration-damping chamber (503) is hinged in the fifth plug hole (210); the positioning knob (501) is fixedly mounted on the vibration-damping chamber (503); the set screw (502) is mounted on the positioning knob (501); a vibration-damping block (504) is mounted in the space enclosed by the vibration-damping chamber (503) and the second lower half shell (202); The maximum length of the block (504) is H, and the gap distance between the vibration-absorbing block (504) and the vibration-absorbing cavity (503) or the second lower half shell (202) is d, then 0.03H≤d≤0.06H; the set screw (502) is installed on the adjustment knob (501) along the maximum length direction of the vibration-absorbing block (504); and a pair of orthogonally connected vibration-absorbing holes 1 (50401) and 2 (50402) are respectively arranged on both sides of the vibration-absorbing block (504) in the length direction.

6. The data monitoring and processing method of the current transformer for motor current collection according to claim 5 is characterized in that: Step S1: installing a current transformer and determining the number of winding turns of the wire to be tested according to the rated current parameter of the motor to be tested; Step S2: connecting the current transformer via the current collector, and transmitting the induced current data of the current transformer to the computer via wired or wireless transmission; Step S3: Establish an online data table on the computer to record the rated current, measured running time and converted measured current data of each current transformer corresponding to the motor to be tested, and record once every 100ms; Step S4: Calculate the influence coefficient, influence coefficient = (measured current value / rated current value) 2 ; Step S5: Calculate the cumulative equivalent running time, where the cumulative equivalent running time = ∑ influence coefficient × measured running time; Step S6: When the accumulated equivalent running time is greater than 3000 hours, an alarm prompt message pops up to remind the staff to perform maintenance on the corresponding monitored motor.

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