A self-checking electronic voltage transformer

Abstract

The present invention relates to the technical field of electronic transformers, in particular to a self-checking electronic voltage transformer, comprising an outer protection mechanism, comprising an upper cover plate, a first outer protective tube, a second outer protective tube and a lower cover plate which are coaxially arranged in sequence from top to bottom, wherein the first outer protective tube is open at the upper end, and the lower end of the first outer protective tube is fixedly connected to the upper end of the second outer protective tube; a mutual inductance mechanism arranged in the first outer protective tube, comprising a rectangular iron core, a primary conductor and a secondary conductor; a voltage dividing mechanism arranged in the second outer protective tube, comprising a conduction component and a plurality of voltage dividing columns arranged in an array along the axis of the second outer protective tube, wherein a plurality of placement grooves are arranged on the end face of the voltage dividing column in a circumferential array; and an adjustment mechanism, comprising a detection component, an adjustment component and a driving component, wherein the adjustment component is used to drive the voltage dividing column to rotate. The electronic voltage transformer can realize self-checking of component damage, and can replace components while keeping the transformer in a working state, and the operation is convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic transformers, and in particular to a self-checking electronic voltage transformer. Background Art

[0002] An electronic transformer is a power distribution device consisting of one or more voltage or current sensors connected to a transmission system and a secondary converter, used to transmit a quantity proportional to the measured quantity, supplying measuring instruments, meters, relay protection or control devices, etc. In the case of a digital interface, a group of electronic transformers share a merging unit to complete this function;

[0003] With the rapid development of optical fiber sensing technology and optical fiber communication technology, optoelectronic technology is increasingly widely used in power systems. Electronic transformers are one of them. Electronic transformers have many advantages, such as small size, light weight, wide frequency response, no saturation phenomenon, good anti-electromagnetic interference performance, oil-free structure, reliable insulation, easy to develop towards digitalization and microcomputerization, etc. They will be widely used in digital substations.

[0004] An electronic voltage transformer is a type of electronic transformer. It uses the principle of series voltage division to reduce the voltage generated by the secondary mutual inductance, and then measures the reduced voltage data to monitor the primary mutual inductance voltage. Common voltage division components include capacitors, resistors, etc. For example, the existing public document CN108646073A-New electronic voltage transformer and the existing public document CN102226973B-An electronic voltage transformer with a temperature measuring device both disclose an electronic voltage transformer. Although the existing public electronic voltage transformer can realize daily primary voltage monitoring, the existing electronic voltage transformer still has the following deficiencies in actual use:

[0005] 1. The existing electronic voltage transformer has single and fixed components for voltage division. When a component is damaged, the staff needs to repair and replace it in time, otherwise the entire transformer will be unusable. In addition, when the primary voltage fluctuates, the supply resistance of the component cannot be adaptively adjusted, which indirectly reduces the service life of the component.

[0006] 2. The existing electronic voltage transformer is a device that has multiple components connected in series. When the components are damaged and cannot be used normally, the staff needs to check them one by one with professional equipment. The voltage transformer itself cannot perform self-checking, which makes maintenance difficult and indirectly increases the labor intensity of the staff.

[0007] Therefore, it is necessary to improve the prior art to solve the above-mentioned technical problems. Summary of the invention

[0008] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0009] In view of the problems that the above-mentioned existing electronic voltage transformer has high emergency maintenance and replacement and weak voltage fluctuation protection capability in actual use, a self-checking electronic voltage transformer is proposed.

[0010] In order to solve the above technical problems, the present invention provides the following technical solutions: a self-checking electronic voltage transformer, comprising an outer protection mechanism, including an upper cover plate, a first outer protective tube, a second outer protective tube and a lower cover plate coaxially arranged in sequence from top to bottom, the first outer protective tube is open at the upper end, and the lower end of the first outer protective tube is fixedly connected to the upper end of the second outer protective tube; a mutual inductance mechanism arranged in the first outer protective tube, including a rectangular iron core, a primary conductor and a secondary conductor; a voltage dividing mechanism arranged in the second outer protective tube, including a conduction component and a plurality of voltage dividing columns arranged in an array along the axis of the second outer protective tube, a plurality of placement grooves are provided on the end face of the voltage dividing column along a circumferential array, and a resistance column is placed in the placement groove, both ends of the placement groove are symmetrically sleeved with threaded sleeves, and the inner wall of the placement groove is provided with an internal thread that spirally matches the threaded sleeve, and the end of the resistance column is abutted against a column fixed on the inner end face of the threaded sleeve, and is located outside the placement groove A hexagonal plate is fixed on one end of the threaded sleeve, and a first metal spring sheet is arranged on the other side of the hexagonal plate, two ends of the first metal spring sheet are inserted into the first clamping strip on the end face of the hexagonal plate, the conduction component includes a threading column, a matching disk and a round-head guide column, a plurality of voltage-dividing columns are coaxially slidably sleeved on the same threading column, a threading groove is coaxially opened inside the threading column, a plurality of matching disks are fixed on the outer wall of the threading column in an array along the axial direction, a plurality of matching disks and a plurality of voltage-dividing columns are alternately arranged, and the number of matching disks is greater than the number of voltage-dividing columns, a round-head guide column is eccentrically fixed on the matching disk, a plurality of round-head guide columns are coaxially arranged, and the round-head guide column and the first metal spring sheet overlap in the same horizontal plane, and the end of the round-head guide column is used to abut against one side face of the first metal spring sheet; and an adjustment mechanism includes a detection component, an adjustment component and a drive component, and the adjustment component is used to drive the voltage-dividing column to rotate.

[0011] The beneficial effects of the present invention are as follows: when the electronic voltage transformer is in use, the resistor column is used as a voltage-dividing component, and the resistor columns located in the same axial direction among the multiple voltage-dividing columns are powered in series through the round-head guide column. After the primary voltage is stepped down by the mutual inductance mechanism, it is divided by the resistor column and finally output from the lower cover position. The voltage-dividing column is driven by the adjustment component, so that the voltage-dividing column can be rotated with the threading column as the axis, so that the positions of multiple resistor columns on the same voltage-dividing column can be changed. In this way, when a certain resistor column is damaged, other resistor columns can act as electrical conduction for adjacent round-head guide columns. This design method does not require timely replacement of the resistor column when it is damaged, and the entire voltage transformer can still be used normally, and the overall practicality is good.

[0012] As a preferred solution of a self-checking electronic voltage transformer of the present invention, wherein: a connecting sleeve is fixedly provided on the bottom surface of the voltage dividing column and is slidably sleeved on the outside of the threading column, and a ring tooth is fixedly sleeved on the outer side wall of the lower end of the connecting sleeve, and a limiting ring is fixedly provided on the outer side walls of the threading columns above and below the voltage dividing column; the adjustment component includes a second toothed disc, a third toothed disc and a second rotating column, a second toothed disc is meshed on one side of the ring tooth, and multiple second toothed discs are fixedly sleeved on the same second rotating column, the second rotating column is rotatably sleeved on the lower cover plate, and the lower end of the second rotating column extends to the bottom of the lower cover plate and is fixedly connected to the third toothed disc.

[0013] As a preferred solution of a self-checking electronic voltage transformer of the present invention, the resistance values ​​of multiple resistor columns in multiple placement slots within 180° are different, and the resistance values ​​of two resistor columns located in the same radial direction are equal.

[0014] As a preferred solution of a self-checking electronic voltage transformer of the present invention, a primary conductor is wound on the horizontal bar at the upper end of the rectangular iron core, a secondary conductor is wound on the horizontal bar at the lower end of the rectangular iron core, and a concave groove is opened in the middle of the side surface where the two vertical bars of the rectangular iron core are close to each other, and a fixing plate is matched in the concave groove, and the fixing plate is fixedly connected to the inner wall of the first outer casing by bolts.

[0015] As a preferred solution of a self-checking electronic voltage transformer of the present invention, a first electrical connector is fixedly sleeved on the upper cover plate, a second electrical connector is fixedly sleeved on the bottom surface of the first outer casing, two ends of the primary conductor are respectively connected to the two first electrical connectors, and at the same time, two ends of the secondary conductor are respectively connected to the two second electrical connectors; electrical connection bolts are provided on the relatively far sides of the two matching disks located at the top and the bottom, and the electrical connection bolts are fixedly connected to the round head guide column, a third electrical connector is fixedly sleeved on the lower cover plate, the electrical connection bolt located at the top is connected to a second electrical connector through a conductive wire, the electrical connection bolt located at the bottom is connected to a conductive head on the third electrical connector through a conductive wire, and the conductive wire connected to the other conductive head passes through the wire threading groove and is connected to another second electrical connector.

[0016] As a preferred solution of a self-checking electronic voltage transformer of the present invention, the upper cover plate is fixedly connected to the top surface of the first outer casing by bolts, and a first concave annular groove is circumferentially provided on the outer side wall of the lower end of the upper cover plate, and a sealing ring is slidably sleeved on the outer side of the first concave annular groove, and mounting frames extending outward are symmetrically fixed on both sides of the top of the first outer casing; a second flange ring is fixedly sleeved on the outer side wall of the upper end of the lower cover plate, and a first flange ring is fixedly sleeved on the outer side wall of the lower end of the second outer casing, and the first flange ring and the second flange ring are fixed by bolts.

[0017] As a preferred solution of a self-checking electronic voltage transformer of the present invention, a heat dissipation groove is provided on the bottom surface of the first outer casing outside the second outer casing along the circumferential direction, a plurality of groups of water inlet windows connected with the heat dissipation groove are provided on the outer wall of the first outer casing at the upper end of the heat dissipation groove along the circumferential direction, and a water collecting cover is fixedly sleeved on the outer wall of the first outer casing below the water inlet window; a plurality of heat dissipation fins are fixedly provided on the inner wall of the heat dissipation groove along the circumferential direction; a plurality of heat dissipation fins are fixedly provided on the outer wall of the second outer casing along the axial direction.

[0018] In view of the problem that when a component of the existing voltage transformer is damaged, the transformer itself cannot perform effective self-inspection, which increases the labor intensity of the staff, a self-inspection electronic voltage transformer of the present invention is further optimized and improved, wherein: the voltage divider column includes a fixed part and an even number of disassembly parts, and a plurality of rectangular grooves are opened on the side wall of the fixed part along a circumferential array, and a disassembly part is gap-fitted in each rectangular groove, and a placement groove is arranged in the disassembly part; the upper and lower ends of the voltage divider column are located at the rectangular groove position and a second concave ring groove is opened along the circumferential direction, and a first arc strip and a second arc strip are gap-fitted in the second concave ring groove, and the first arc strip and the second arc strip are spliced ​​into a circular ring strip, and the end distance of the first arc strip is smaller than the width distance of the rectangular groove; a matching groove is opened on one side wall of the second outer casing, and a replacement plate is gap-fitted in the matching groove, and a side wall of the replacement plate is attached to the outer side wall of the voltage divider column, and the first arc strips on the plurality of voltage divider columns are fixedly connected to the side wall of the replacement plate through a connecting strip, and the second arc strip is fixedly connected to the The first rotating column and the replacement plate are respectively arranged on both sides of the voltage dividing column, the conductive strip is arranged on one side of the voltage dividing column, and the conductive strip is fixed on the outer side wall of the first rotating column, and the two ends of the conductive strip are symmetrically fixed with abutment strips, and the free end of the abutment strip is provided with a for abutting against the side wall of the round head guide column. The second metal spring sheet on the upper cover, both ends of the second metal spring sheet are inserted into the second clamping strip on the end surface of the abutting strip, and multiple conductive strips on the same horizontal plane are arranged in a uniform array along the circumference of the first rotating column. Assuming that the minimum angle between two adjacent conductive strips is α, the angle between the two conductive strips farthest apart is β, the number of conductive strips is m, and mα-α≠β, then mα-α+β=360°, and β≥α; the first rotating column is rotatably sleeved on the lower cover plate, and a first toothed disc is fixedly provided on one end of the first rotating column extending below the lower cover plate.

[0019] Another beneficial effect of the present invention is that when the electronic voltage transformer is in use, the setting of the component is adjusted, and multiple conductive strips are arranged in a uniform array along the circumference of the first rotating column on the same horizontal plane. As the first rotating column rotates, at most one of the two ends of the conductive strip abuts against the round-head guide columns at both ends of the voltage divider column to achieve electrical conduction. In this way, under the premise that each conductive strip is conductive once, a value different from other values ​​will be detected, so that the staff can quickly determine which component is damaged; after the detection is completed, as the voltage divider column rotates, the disassembly part with the damaged component can be moved to the replacement plate position, because the disassembly part and the fixed part are detachably matched and the first arc-shaped strip gap is matched in the second concave ring groove. When the replacement plate is taken out, the disassembly part carrying the damaged component will also be taken out synchronously. At this time, the staff can accurately and quickly replace the damaged components, and the overall practicality is good. Through the setting of multiple resistance columns on the same voltage divider column, when the components are replaced, the entire detection circuit will not be open and can still work normally.

[0020] As a preferred solution of a self-checking electronic voltage transformer of the present invention, wherein: plug-ins are fixedly provided on the two symmetrical side walls of the disassembly portion, and a slot for sliding and inserting the plug-ins is opened on the inner wall of the rectangular groove; a matching plate is fixedly provided on the side surface of the replacement plate away from the first arc strip, and the matching plate is fixed to the second outer casing by bolts.

[0021] As a preferred solution of a self-checking electronic voltage transformer of the present invention, the driving component includes a bar tooth plate and a connecting plate, one side of the first tooth plate and the third tooth plate are meshed with a bar tooth plate, the connecting plate is arranged between the two bar tooth plates, a T-shaped column is fixedly provided at one end of the bar tooth plate, a first connecting plate is slidably sleeved on the T-shaped column, and a spring is slidably sleeved on the T-shaped column on the side of the first connecting plate away from the bar tooth plate, the first connecting plate is fixedly provided on one side surface of the connecting plate, a second connecting plate is fixedly provided on the connecting plate on the other side of the bar tooth plate where the T-shaped column is provided, and an electromagnetic block is fixedly sleeved in the second connecting plate; a base plate is fixedly provided on the middle part of a side surface of the connecting plate close to the lower cover plate, and the base plate is fixedly connected to the bottom surface of the lower cover plate by bolts. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0023] Figure 1 The figure is a schematic diagram of the overall structure of a self-checking electronic voltage transformer.

[0024] Figure 2 The figure is a schematic diagram of the bottom structure of a self-checking electronic voltage transformer.

[0025] Figure 3 For the present invention Figure 1 A cross-sectional view of the structure in the vertical direction.

[0026] Figure 4 For the present invention Figure 1 A cross-sectional view of the structure in the horizontal direction.

[0027] Figure 5 For the present invention Figure 1 Exploded view of the structure.

[0028] Figure 6 It is a schematic diagram of the overall structure of the first outer casing and the second outer casing in the present invention.

[0029] Figure 7 For the present invention Figure 6 A cross-sectional view of the structure in the vertical direction.

[0030] Figure 8 It is a schematic diagram of the overall structure of the replacement plate in the present invention.

[0031] Fig. 9 It is a schematic diagram of the overall structure of the mutual inductance mechanism in the present invention.

[0032] Fig.10 It is a schematic diagram of the overall structure of the voltage dividing mechanism in the present invention.

[0033] Fig.11 It is a schematic diagram of the overall structure of the conduction component in the present invention.

[0034] Fig.12 It is a schematic diagram of the overall structure of the pressure dividing column and its explosion state in the present invention.

[0035] Fig.13 It is a schematic diagram of the overall structure of the regulating mechanism in the present invention.

[0036] Fig.14 It is a schematic diagram of the overall structure of the driving component in the present invention. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0038] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0039] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0040] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included. Example 1

[0041] Reference Figure 1 , Figure 2 , Figure 5 , Figure 6 and Fig. 9 , which is the first embodiment of the present invention. This embodiment provides a self-checking electronic voltage transformer. When the voltage transformer is in use, the outer protection mechanism 100 is used to play a certain protective role, the mutual inductance mechanism 200 is used to reduce the primary voltage through mutual inductance, the voltage dividing mechanism 300 is mainly used to further reduce the secondary voltage by series voltage division, and the adjustment mechanism 400 is used to adjust the data of the voltage dividing mechanism 300.

[0042] Specifically, it includes an outer protective mechanism 100, including an upper cover plate 101, a first outer protective tube 102, a second outer protective tube 103 and a lower cover plate 104 coaxially arranged in sequence from top to bottom, the first outer protective tube 102 is open at the upper end, and the lower end of the first outer protective tube 102 is fixedly connected to the upper end of the second outer protective tube 103; a mutual inductance mechanism 200 arranged in the first outer protective tube 102, including a rectangular iron core 201, a primary conductor 202 and a secondary conductor 203; a voltage dividing mechanism 300 arranged in the second outer protective tube 103, including a conduction component 302 and a plurality of voltage dividing columns 301 arranged in an array along the axis of the second outer protective tube 103; and an adjustment mechanism 400, including a detection component 401, an adjustment component 402 and a driving component 403, the adjustment component 402 is used to drive the voltage dividing column 301 to rotate;

[0043] The upper cover plate 101 is fixedly connected to the top surface of the first outer casing 102 by bolts, so as to realize the detachable connection between the upper cover plate 101 and the first outer casing 102, so as to facilitate the maintenance of the mutual inductance mechanism 200, and a first concave annular groove 101a is opened on the outer side wall of the lower end of the upper cover plate 101 along the circumferential direction, and a sealing ring 101a-1 is slidably sleeved on the outer side of the first concave annular groove 101a, which can improve the sealing performance between the upper cover plate 101 and the first outer casing 102. The top two sides of the first outer casing 102 are A mounting frame 102b extending outward is symmetrically fixed to facilitate the fixed installation of the entire electronic voltage transformer. A second flange ring 104a is fixedly sleeved on the outer wall of the upper end of the lower cover plate 104, and a first flange ring 103c is fixedly sleeved on the outer wall of the lower end of the second outer casing 103, and the first flange ring 103c and the second flange ring 104a are fixed by bolts. This arrangement facilitates the detachable connection between the second outer casing 103 and the lower cover plate 104, and is convenient for the maintenance of the inner wall of the second outer casing 103.

[0044] A primary conductor 202 is wound on the horizontal bar at the upper end of the rectangular iron core 201, and a secondary conductor 203 is wound on the horizontal bar at the lower end of the rectangular iron core 201. A concave slot 201a is provided in the middle of a side surface where two vertical bars of the rectangular iron core 201 are close to each other. A fixing plate 204 is provided in the concave slot 201a, and the fixing plate 204 is fixedly connected to the inner wall of the first outer casing 102 by bolts to facilitate the fixed installation of the mutual inductance mechanism 200 in the first outer casing 102. When the above arrangement is in use, the voltage is adjusted by the different numbers of coils of the primary conductor 202 and the secondary conductor 203 wound on the rectangular iron core 201 under the action of electromagnetic mutual induction. Because its working principle is the existing technology, it will not be repeated again.

[0045] See Figure 3 , Figure 5 , Fig.12 and Fig.13As shown, a plurality of placement grooves 301c are provided on the end surface of the voltage dividing column 301 along a circumferential array, and a resistor column 301d is placed in the placement groove 301c, and threaded sleeves 301e are symmetrically sleeved at both ends of the placement groove 301c, and an internal thread 301c-1 that is spirally matched with the threaded sleeve 301e is provided on the inner wall of the placement groove 301c, so that a detachable connection between the threaded sleeve 301e and the placement groove 301c can be achieved, and the end of the resistor column 301d is abutted against the abutment column 301e-1 fixed on the inner end surface of the threaded sleeve 301e. The setting of the stop column 301e-1 can realize the electrical connection between the resistor column 301d and the threaded sleeve 301e. A hexagonal plate 301e-2 is fixed on one end of the threaded sleeve 301e located outside the placement groove 301c, which is convenient for replacing the threaded sleeve 301e with a tool, and a first metal spring 301f is provided on the other side of the hexagonal plate 301e-2. The two ends of the first metal spring 301f are inserted into the first clamping strip 301e-3 on the end surface of the hexagonal plate 301e-2 to limit the first metal spring 301f.

[0046] When the above arrangement is in use, the resistor column 301d is a component in the secondary circuit and plays a role of voltage division. The first metal spring 301f realizes electrical conduction with the resistor column 301d through the threaded sleeve 301e. In actual use, the resistor column 301d can be replaced by a voltage division component such as a capacitor.

[0047] See Fig.10 and Fig.11 As shown, the conducting component 302 includes a threading column 302a, a matching disk 302b and a round head guide column 302c, a plurality of pressure dividing columns 301 are coaxially slidably sleeved on the same threading column 302a, a threading groove is coaxially provided inside the threading column 302a, a plurality of matching disks 302b are fixedly arranged in an array along the axial direction on the outer wall of the threading column 302a, the plurality of matching disks 302b and the plurality of pressure dividing columns 301 are alternately arranged, and the number of matching disks 302b is greater than the number of pressure dividing columns 301, and an eccentric fixed The round-headed guide pillar 302c and the plurality of round-headed guide pillars 302c are coaxially arranged, and the rotation track surfaces of the round-headed guide pillar 302c and the first metal spring 301f overlap on the same horizontal plane, and the end of the round-headed guide pillar 302c is used to abut against one side surface of the first metal spring 301f, so that the electrical conduction of the round-headed guide pillar 302c between two adjacent voltage-dividing pillars 301 can be realized. When the plurality of voltage-dividing pillars 301 are connected in series through the plurality of round-headed guide pillars 302c, the resistance pillar 301d can play the role of voltage-dividing in the circuit.

[0048] Furthermore, the resistance values ​​of the multiple resistor columns 301d in the multiple placement slots 301c within 180° are different, and the resistance values ​​of the two resistor columns 301d located in the same radial direction are equal. In this way, when the primary voltage is unstable, the secondary circuit can be protected by adjusting the resistance value. The equal resistance value setting of the two resistor columns 301d in the same radial direction can be achieved by rotating the voltage divider column 301 to achieve rapid replacement of equal values ​​when one resistor column 301d is damaged.

[0049] See Figure 4 , Fig.11 , Fig.12 and Fig.13 As shown, a connecting sleeve is fixedly provided on the bottom surface of the pressure dividing column 301 and is slidably sleeved on the outside of the threading column 302a, and a ring gear 301a-1 is fixedly sleeved on the outer side wall of the lower end of the connecting sleeve, and a limiting ring 302a-1 is fixedly provided on the outer side walls of the threading columns 302a above and below the pressure dividing column 301, so as to limit the position of the pressure dividing column 301 on the threading column 302a; the adjusting component 402 includes a second toothed disc 402a, a third toothed disc 402b and a second rotating column 402c, a second toothed disc 402a is meshedly provided on one side of the ring gear 301a-1, and a plurality of second toothed discs 402a are fixedly sleeved on the same second rotating column 402c, the second rotating column 402c is rotatably sleeved on the lower cover plate 104, and the lower end of the second rotating column 402c extends to the bottom of the lower cover plate 104 and is fixedly connected to the third toothed disc 402b;

[0050] When the above arrangement is in use, the third toothed disc 402b drives the second rotating column 402c to rotate, so that the synchronous rotation of multiple second toothed discs 402a can be achieved. Through the meshing arrangement between the second toothed disc 402a and the ring tooth 301a-1, the synchronous rotation of multiple voltage divider columns 301 can be achieved under the rotation of the second toothed disc 402a, thereby completing the switching of the circuit between the resistor column 301d and the round head guide column 302c.

[0051] See Figure 1 , Figure 2 , Figure 3 , Figure 5 , Fig. 9 and Fig.10 As shown, a first electrical connector 101b is fixedly sleeved on the upper cover plate 101, a second electrical connector 102a is fixedly sleeved on the bottom surface of the first outer casing 102, two ends of the primary conductor 202 are respectively connected to the two first electrical connectors 101b, and at the same time, two ends of the secondary conductor 203 are respectively connected to the two second electrical connectors 102a, so that the external current can flow on the primary conductor 202 and generate current on the secondary conductor 203 after mutual inductance;

[0052] The two matching plates 302b at the top and bottom are both provided with an electrical connection bolt 302c-1 on the relatively far side, and the electrical connection bolt 302c-1 is fixedly connected to the round head guide column 302c, and the lower cover plate 104 is fixedly sleeved with a third electrical connector 104b, and the third electrical connector 104b below the lower cover plate 104 is connected to an optical fiber detection device. The working principle of the detection device is the existing technology and is not described again. The electrical connection bolt 302c-1 at the top is connected to a second electrical connector 102a through a conductive line, and the electrical connection bolt 302c-1 at the bottom is connected to the third A conductive head on the electrical connector 104b is connected through a conductive wire, and the conductive wire connected to another conductive head passes through a threading groove and is connected to another second electrical connector 102a, so that the secondary circuit flows into each resistor column 301d through one end of the secondary wire 203, and then flows into the optical fiber detection equipment through the third electrical connector 104b for data collection, and then the circuit flows back to the secondary wire 203 through the conductive wire in the threading groove, forming a loop of the entire secondary circuit. The optical fiber detection equipment at least includes an AD sampler, a microprocessor, an electro-optical converter, an optical fiber and a photoelectric converter. Example 2

[0053] Reference Figure 3 , Figure 6 and Figure 7 , which is the second embodiment of the present invention, is based on the previous embodiment, except that this embodiment is proposed in order to improve the heat dissipation effect of the entire transformer so that the electronic voltage transformer can work better in a high temperature environment.

[0054] Specifically, a heat dissipation groove 102c is provided on the bottom surface of the first outer casing 102 outside the second outer casing 103 along the circumferential direction, and this arrangement facilitates the discharge of dust and rainwater through the lower end of the heat dissipation groove 102c. A plurality of groups of water inlet windows 102c-2 connected to the heat dissipation groove 102c are provided on the outer wall of the first outer casing 102 at the upper end of the heat dissipation groove 102c along the circumferential array, and a water collecting cover 102c-1 is fixedly sleeved on the outer wall of the first outer casing 102 below the water inlet window 102c-2. The lower end of the water collecting cover 102c-1 is parallel to the bottom surface of the lowest water inlet window 102c-2, and some of the water inlet windows 102c-2 of the same group are higher than the upper end of the water collecting cover 102c-1; a plurality of heat dissipation fins 102c-3 are fixedly provided on the inner wall of the heat dissipation groove 102c along the circumferential array; a plurality of heat dissipation fins 103a are fixedly provided on the outer wall of the second outer casing 103 along the axial direction array;

[0055] When the above arrangement is in use, the heat dissipation groove 102c and the water collecting cover 102c-1 are arranged to facilitate external air and rainwater to enter the heat dissipation groove 102c through the water inlet window 102c-2 for circulation, so as to bring out the heat in the first outer casing 102. The heat sink 102c-3 can improve the heat dissipation effect under the premise of increasing the surface area. The heat dissipation fins 103a are arranged to dissipate heat under the premise of increasing the surface area of ​​the second outer casing 103. Example 3

[0056] Reference Figure 3 , Figure 4 , Figure 8 , Fig.11 , Fig.12 and Fig.13 , which is the third embodiment of the present invention, is based on any of the above embodiments, except that this embodiment is proposed to facilitate the staff to quickly detect and locate damaged components and replace them after locating.

[0057] Specifically, the voltage dividing column 301 includes a fixed portion 301a and an even number of disassembly portions 301b, and a plurality of rectangular grooves 301a-2 are arranged in a circumferential array on the side wall of the fixed portion 301a, and a disassembly portion 301b is fitted in a clearance in each rectangular groove 301a-2, and a placement groove 301c is arranged in the disassembly portion 301b; the upper and lower ends of the voltage dividing column 301 are both provided with a second concave annular groove 301g in a circumferential direction at the position of the rectangular groove 301a-2, and a first arc strip 103b-3 and a second arc strip 302d are fitted in a clearance in the second concave annular groove 301g, and the first arc strip 103b-3 and the second arc strip 302d are spliced. The first arc strip 103b-3 is formed into a circular ring strip, and the setting of the circular ring strip can limit the disassembly portion 301b to prevent the disassembly portion 301b from being separated from the fixed portion 301a. The end distance of the first arc strip 103b-3 is smaller than the width distance of the rectangular groove 301a-2. This setting is convenient for removing one of the disassembly portions 301b from the fixed portion 301a under the drive of the first arc strip 103b-3. Insertion pieces 301b-1 are fixed on the two symmetrical side walls of the disassembly portion 301b. At the same time, a slot 301a-3 for the sliding insertion of the insertion piece 301b-1 is opened on the inner wall of the rectangular groove 301a-2, so that the disassembly portion 301b can be limited on the fixed portion 301a.

[0058] A matching groove 103d is provided on one side wall of the second outer casing 103, and a replacement plate 103b is fitted in the gap in the matching groove 103d, and a side wall of the replacement plate 103b is attached to the outer side wall of the pressure dividing column 301, and the first arc strips 103b-3 on multiple pressure dividing columns 301 are fixedly connected to one side wall of the replacement plate 103b through connecting strips 103b-4, and the second arc strip 302d is fixedly connected to the nearby matching disk 302b through connecting columns 302d-1; a metal adsorption sheet 301b-2 is embedded and fixedly provided on one side wall of the disassembly portion 301b close to the inner wall of the second outer casing 103, and a magnetic plate 103b-2 is fixedly provided inside the replacement plate 103b along the long side direction, When the above arrangement is in use, when the replacement plate 103b is removed from the second outer casing 103, the disassembly portion 301b close to the replacement plate 103b will be brought out due to the magnetic adsorption of the metal adsorption sheet 301b-2 by the magnetic plate 103b-2 and the limiting driving action of the first arc strip 103b-3 on the voltage divider column 301, so as to realize the replacement of the resistance column 301d on the disassembly portion 301b, and a matching plate 103b-1 is fixedly provided on the side surface of the replacement plate 103b away from the first arc strip 103b-3, and the matching plate 103b-1 is fixed to the second outer casing 103 by bolts, thereby realizing the detachable connection between the replacement plate 103b and the second outer casing 103.

[0059] The adjustment component 402 includes a first rotating column 401a, a conductive strip 401b, a second metal spring 401c and a first toothed disc 401d. The first rotating column 401a and the replacement plate 103b are respectively arranged on both sides of the voltage dividing column 301. The conductive strip 401b is arranged on one side of the voltage dividing column 301, and the conductive strip 401b is fixed on the outer side wall of the first rotating column 401a. The two ends of the conductive strip 401b are symmetrically fixed with abutment strips 401b-1, and the free end of the abutment strip 401b-1 is provided with a second metal spring 401c for abutting against the side wall of the round head guide column 302c. The second metal spring 401c is provided with a The two ends are inserted into the second clamping strip 401b-2 on the end surface of the abutting strip 401b-1. A plurality of conductive strips 401b are arranged in a uniform array along the circumference of the first rotating column 401a on the same horizontal plane. Assuming that the minimum angle between two adjacent conductive strips 401b is α, the angle between the two conductive strips 401b farthest apart is β, the number of conductive strips 401b is m, and mα-α≠β, then mα-α+β=360°, and β≥α; the first rotating column 401a is rotatably sleeved on the lower cover plate 104, and a first toothed disc 401d is fixedly provided on one end of the first rotating column 401a extending below the lower cover plate 104;

[0060] When the above arrangement is used, the first rotating column 401a can be driven by the first toothed disc 401d to rotate, thereby driving the conductive strip 401b to rotate. By arranging a plurality of conductive strips 401b in a uniform array along the circumference of the first rotating column 401a on the same horizontal plane, when the first rotating column 401a rotates, at most one of the abutting strips 401b-1 at both ends of the conductive strip 401b can abut against the round-headed guide posts 302c at both ends of the voltage dividing column 301. When the second metal spring 401c on the round-headed guide post 302c abuts against the round-headed guide post 302c, the conductive strip 401b-1 at both ends of the conductive strip 401b can abut against the round-headed guide post 302c. When 02c is in contact, it is equivalent to connecting a circuit on one side of the voltage divider column 301. When the resistor column 301d on the voltage divider column 301 cannot conduct electricity, the conductive strip 401b is the only circuit at this time. When the resistor column 301d on the voltage divider column 301 can conduct electricity, the conductive strip 401b is a parallel circuit at this time. In this way, after all the conductive strips 401b are electrically connected, there will be a group of circuit values ​​that are different from the others. In this way, the problematic voltage divider column 301 can be self-detected, which is convenient for subsequent accurate and rapid replacement. Example 4

[0061] Reference Figure 2 , Figure 4 , Figure 5 , Fig.13 and Fig.14 , which is the fourth embodiment of the present invention. This embodiment is based on the previous embodiment, but the difference is that in order to facilitate and better implement the present invention, the structure of the driving component 403 used to drive the detection component 401 and the adjustment component 402 to work is detailed.

[0062] Specifically, the driving assembly 403 includes a toothed plate 403a and a connecting plate 403b. The first toothed plate 401d and the third toothed plate 402b are both meshed with a toothed plate 403a. The connecting plate 403b is arranged between the two toothed plates 403a. A T-shaped column 403a-1 is fixedly arranged at one end of the toothed plate 403a. A first connecting piece 403b-1 is slidably sleeved on the T-shaped column 403a-1. A spring is slidably sleeved on the T-shaped column 403a-1 on the side of the first connecting piece 403b-1 away from the toothed plate 403a. A spring 403a-2, a first connecting piece 403b-1 is fixedly arranged on one side of the connecting plate 403b, a second connecting piece 403b-2 is fixedly arranged on the connecting plate 403b on the other side of the toothed plate 403a provided with the T-shaped column 403a-1, and an electromagnetic block 403b-4 is fixedly sleeved in the second connecting piece 403b-2; a base plate 403b-3 is fixedly arranged on the middle part of a side surface of the connecting plate 403b close to the lower cover plate 104, and the base plate 403b-3 is fixedly connected to the bottom surface of the lower cover plate 104 by bolts;

[0063] When the above-mentioned arrangement is in use, by energizing the electromagnetic block 403b-4, the electromagnetic block 403b-4 can magnetically adsorb one end of the bar tooth plate 403a to facilitate the movement of the bar tooth plate 403a, and because the bar tooth plate 403a is meshed with the first tooth plate 401d or the third tooth plate 402b, the rotation of the first tooth plate 401d and the third tooth plate 402b can be achieved. When the electromagnetic block 403b-4 is powered off and demagnetized, the spring 403a-2 can reset the bar tooth plate 403a, thereby resetting the first tooth plate 401d or the third tooth plate 402b.

[0064] In addition, the device also includes a controller (not shown in the drawings), which is used to control various electrical components in the device. The controller is arranged at a position convenient for operation by staff.

[0065] In addition, it should be noted that the components not described in detail in this article are prior art.

[0066] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and ratio of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangements, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of a plurality of parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the present invention is not limited to a specific embodiment, but extends to a variety of modifications that still fall within the scope of the appended claims.

[0067] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment may not be described (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those features that are not relevant to implementing the invention).

[0068] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0069] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A self-checking electronic voltage transformer, characterized in that: include, The outer protection mechanism (100) comprises an upper cover plate (101), a first outer protection tube (102), a second outer protection tube (103) and a lower cover plate (104) which are coaxially arranged in sequence from top to bottom, wherein the first outer protection tube (102) is open at the upper end, and the lower end of the first outer protection tube (102) is fixedly connected to the upper end of the second outer protection tube (103); A mutual inductance mechanism (200) disposed in the first outer casing (102), comprising a rectangular iron core (201), a primary conductor (202) and a secondary conductor (203); The voltage dividing mechanism (300) arranged in the second outer casing (103) comprises a conducting component (302) and a plurality of voltage dividing columns (301) arranged in an array along the axis of the second outer casing (103); a plurality of placement grooves (301c) are arranged in a circumferential array on the end surface of the voltage dividing column (301); a resistance column (301d) is placed in the placement groove (301c); threaded sleeves (301e) are symmetrically sleeved at both ends of the placement groove (301c); and a threaded sleeve (301e) is provided on the inner wall of the placement groove (301c). An internal thread (301c-1) is spirally matched with the threaded sleeve (301e), the end of the resistance column (301d) is abutted against the abutment column (301e-1) fixedly arranged on the inner end surface of the threaded sleeve (301e), a hexagonal plate (301e-2) is fixedly arranged on one end of the threaded sleeve (301e) located outside the placement groove (301c), and a first metal spring sheet (301f) is arranged on the other side of the hexagonal plate (301e-2), and the two ends of the first metal spring sheet (301f) are plugged into the hexagonal plate (301 e-2) in the first clamping strip (301e-3) on the end surface, the conducting component (302) comprises a threading column (302a), a matching disk (302b) and a round-head guide column (302c), a plurality of the voltage dividing columns (301) are coaxially slidably sleeved on the same threading column (302a), a threading groove is coaxially provided inside the threading column (302a), a plurality of matching disks (302b) are fixedly arranged in an array along the axial direction on the outer side wall of the threading column (302a), and the plurality of matching disks (302b) and A plurality of pressure dividing columns (301) are arranged alternately, and the number of the matching disks (302b) is greater than the number of the pressure dividing columns (301); a round-headed guide column (302c) is eccentrically fixedly provided on the matching disk (302b); a plurality of the round-headed guide columns (302c) are coaxially arranged, and the rotation track surfaces of the round-headed guide columns (302c) and the first metal spring (301f) overlap on the same horizontal plane; an end of the round-headed guide column (302c) is used to abut against a side surface of the first metal spring (301f); and, The adjusting mechanism (400) comprises a detection component (401), an adjustment component (402) and a driving component (403); the lower ends of the detection component (401) and the adjustment component (402) located inside the second outer casing (103) both pass through the lower cover plate (104) and extend to below the lower cover plate (104); the driving component (403) is fixedly mounted on the bottom surface of the lower cover plate (104); and the adjustment component (402) is used to drive the voltage dividing column (301) to rotate.

2. A self-checking electronic voltage transformer as claimed in claim 1, characterized in that: A connecting sleeve is fixedly provided on the bottom surface of the pressure dividing column (301) and is slidably sleeved on the outside of the threading column (302a), and a ring tooth (301a-1) is fixedly sleeved on the outer side wall of the lower end of the connecting sleeve, and a limiting ring (302a-1) is fixedly provided on the outer side walls of the threading columns (302a) above and below the pressure dividing column (301); The adjustment component (402) comprises a second toothed disc (402a), a third toothed disc (402b) and a second rotating column (402c); a second toothed disc (402a) is meshedly disposed on one side of the ring gear (301a-1); a plurality of second toothed discs (402a) are fixedly sleeved on the same second rotating column (402c); the second rotating column (402c) is rotatably sleeved on the lower cover plate (104); and the lower end of the second rotating column (402c) extends to below the lower cover plate (104) and is fixedly connected to the third toothed disc (402b).

3. A self-checking electronic voltage transformer as claimed in claim 2, characterized in that: The resistance values ​​of the plurality of resistance columns (301d) in the plurality of placement slots (301c) within 180° are different, and the resistance values ​​of two resistance columns (301d) located in the same radial direction are equal.

4. A self-checking electronic voltage transformer as claimed in claim 2, characterized in that: A primary conductor (202) is wound on the horizontal bar at the upper end of the rectangular iron core (201), and a secondary conductor (203) is wound on the horizontal bar at the lower end of the rectangular iron core (201). A concave slot (201a) is provided in the middle of a side surface where two vertical bars of the rectangular iron core (201) are close to each other. A fixing plate (204) is matched in the concave slot (201a), and the fixing plate (204) is fixedly connected to the inner wall of the first outer casing (102) by means of bolts.

5. A self-checking electronic voltage transformer as claimed in claim 4, characterized in that: A first electrical connector (101b) is fixedly sleeved on the upper cover plate (101), a second electrical connector (102a) is fixedly sleeved on the bottom surface of the first outer casing (102), two ends of the primary conductor (202) are respectively connected to the two first electrical connectors (101b), and two ends of the secondary conductor (203) are respectively connected to the two second electrical connectors (102a); An electric connection bolt (302c-1) is provided on one side of the two matching plates (302b) located at the top and the bottom, which are relatively far away, and the electric connection bolt (302c-1) is fixedly connected to the round head guide column (302c); a third electric connector (104b) is fixedly sleeved on the lower cover plate (104); the electric connection bolt (302c-1) located at the top is connected to a second electric connector (102a) via a conductive wire; the electric connection bolt (302c-1) located at the bottom is connected to a conductive head on the third electric connector (104b) via a conductive wire; and the conductive wire connected to the other conductive head passes through a wire threading slot and is connected to another second electric connector (102a).

6. A self-checking electronic voltage transformer as claimed in claim 5, characterized in that: The upper cover plate (101) is fixedly connected to the top surface of the first outer casing (102) by means of bolts, and a first concave annular groove (101a) is circumferentially provided on the outer side wall of the lower end of the upper cover plate (101), and a sealing ring (101a-1) is slidably sleeved on the outer side of the first concave annular groove (101a), and mounting frames (102b) extending outwards are symmetrically fixedly provided on both sides of the top of the first outer casing (102); A second flange ring (104a) is fixedly sleeved on the outer wall of the upper end of the lower cover plate (104), and a first flange ring (103c) is fixedly sleeved on the outer wall of the lower end of the second outer casing (103), and the first flange ring (103c) and the second flange ring (104a) are fixed by bolts.

7. A self-checking electronic voltage transformer as claimed in claim 2, 3 or 6, characterized in that: A heat dissipation groove (102c) is provided on the bottom surface of the first outer protective tube (102) outside the second outer protective tube (103) in a circumferential direction; a plurality of groups of water inlet windows (102c-2) in communication with the heat dissipation groove (102c) are provided in a circumferential array on the outer side wall of the first outer protective tube (102) at the upper end of the heat dissipation groove (102c); a water collecting cover (102c-1) is fixedly sleeved on the outer side wall of the first outer protective tube (102) below the water inlet windows (102c-2); and a plurality of heat dissipation fins (102c-3) are fixedly provided in a circumferential array on the inner side wall of the heat dissipation groove (102c); A plurality of heat dissipation fins (103a) are fixedly arranged in an array along the axial direction on the outer side wall of the second outer casing (103).

8. A self-checking electronic voltage transformer as claimed in claim 7, characterized in that: The voltage dividing column (301) comprises a fixed portion (301a) and an even number of disassembly portions (301b); a plurality of rectangular grooves (301a-2) are arranged in a circumferential array on the side wall of the fixed portion (301a); a disassembly portion (301b) is gap-fitted in each rectangular groove (301a-2); and a placement groove (301c) is arranged in the disassembly portion (301b); a second concave annular groove (301g) is circumferentially arranged at the upper and lower ends of the voltage dividing column (301) at the positions of the rectangular grooves (301a-2); a first arc strip (103b-3) and a second arc strip (302d) are gap-fitted in the second concave annular groove (301g); the first arc strip (103b-3) and the second arc strip (302d) are spliced ​​into a circular ring strip; and the end distance of the first arc strip (103b-3) is smaller than the width distance of the rectangular grooves (301a-2); A matching groove (103d) is provided on one side wall of the second outer casing (103); a replacement plate (103b) is gap-matched in the matching groove (103d); and a side wall of the replacement plate (103b) is attached to the outer side wall of the pressure dividing column (301); a plurality of first arc-shaped strips (103b-3) on the pressure dividing column (301) are fixedly connected to a side wall of the replacement plate (103b) via a connecting strip (103b-4); and the second arc-shaped strip (302d) is fixedly connected to a nearby matching plate (302b) via a connecting column (302d-1); A metal adsorption sheet (301b-2) is embedded and fixedly provided on a side wall of the disassembly portion (301b) close to the inner wall of the second outer casing (103), and a magnetic plate (103b-2) is fixedly provided inside the replacement plate (103b) along the long side direction; The adjustment component (402) comprises a first rotating column (401a), a conductive strip (401b), a second metal spring (401c) and a first toothed disc (401d); the first rotating column (401a) and the replacement plate (103b) are respectively arranged on both sides of the voltage dividing column (301); the conductive strip (401b) is arranged on one side of the voltage dividing column (301), and the conductive strip (401b) is fixedly arranged on the outer side wall of the first rotating column (401a); both ends of the conductive strip (401b) are symmetrically fixedly provided with abutment strips (401b-1), and the free end of the abutment strip (401b-1) is provided with a for abutment A second metal spring sheet (401c) is engaged with the side wall of the round head guide column (302c), and both ends of the second metal spring sheet (401c) are inserted into the second clamping strip (401b-2) on the end surface of the abutting strip (401b-1). A plurality of the conductive strips (401b) are arranged in a uniform array along the circumference of the first rotating column (401a) on the same horizontal plane. Assuming that the minimum angle between two adjacent conductive strips (401b) is α, and the angle between the two conductive strips (401b) that are farthest apart is β, the number of the conductive strips (401b) is m, and mα-α≠β, then mα-α+β=360°, and β≥α; The first rotating column (401a) is rotatably sleeved on the lower cover plate (104), and a first toothed disc (401d) is fixedly provided on one end of the first rotating column (401a) extending below the lower cover plate (104).

9. A self-checking electronic voltage transformer as claimed in claim 8, characterized in that: Insertion pieces (301b-1) are fixedly provided on two symmetrical side walls of the disassembly portion (301b), and a slot (301a-3) for slidingly inserting the insertion piece (301b-1) is provided on the inner wall of the rectangular groove (301a-2); A matching plate (103b-1) is fixedly provided on a side surface of the replacement plate (103b) away from the first arc-shaped strip (103b-3); the matching plate (103b-1) is matched and fixed to the second outer casing (103) by bolts.

10. A self-checking electronic voltage transformer as claimed in claim 8, characterized in that: The driving assembly (403) comprises a toothed plate (403a) and a connecting plate (403b); one side of the first toothed plate (401d) and the third toothed plate (402b) are both meshed with a toothed plate (403a); the connecting plate (403b) is arranged between the two toothed plates (403a); one end of the toothed plate (403a) is fixedly provided with a T-shaped column (403a-1); a first connecting plate (403b-1) is slidably sleeved on the T-shaped column (403a-1); and the first connecting plate ( A spring (403a-2) is slidably sleeved on a T-shaped column (403a-1) on one side away from the toothed plate (403a), the first connecting piece (403b-1) is fixedly arranged on one side of the connecting plate (403b), a second connecting piece (403b-2) is fixedly arranged on the connecting plate (403b) on the other side of the toothed plate (403a) on which the T-shaped column (403a-1) is arranged, and an electromagnetic block (403b-4) is fixedly sleeved in the second connecting piece (403b-2); A base plate (403b-3) is fixedly provided at the middle of a side surface of the connection plate (403b) close to the lower cover plate (104), and the base plate (403b-3) is fixedly connected to the bottom surface of the lower cover plate (104) by means of bolts.

Images