CN107993805A - A kind of convenient fixing device of transformer - Google Patents

A kind of convenient fixing device of transformer Download PDF

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Publication number
CN107993805A
CN107993805A CN201810068484.1A CN201810068484A CN107993805A CN 107993805 A CN107993805 A CN 107993805A CN 201810068484 A CN201810068484 A CN 201810068484A CN 107993805 A CN107993805 A CN 107993805A
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CN
China
Prior art keywords
fixedly connected
transformer
sides
plate
support plate
Prior art date
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Granted
Application number
CN201810068484.1A
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Chinese (zh)
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CN107993805B (en
Inventor
施爱民
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Suizhou Power Supply Co of State Grid Hubei Electric Power Co Ltd
Original Assignee
Anji Crystal Saint Pv Power Generation Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Priority to CN201810068484.1A priority Critical patent/CN107993805B/en
Publication of CN107993805A publication Critical patent/CN107993805A/en
Application granted granted Critical
Publication of CN107993805B publication Critical patent/CN107993805B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/06Mounting, supporting or suspending transformers, reactors or choke coils not being of the signal type

Abstract

The invention discloses a kind of convenient fixing device of transformer, including support plate and transformer, the both sides of the support plate have been fixedly connected with retainer ring, and the internal activity of retainer ring is connected with electric pole, the side of the retainer ring is fixedly connected with the bar that is screwed, and the both sides of transformer bottom have been fixedly connected with supporting block, placing frame is fixedly connected with the top of the support plate, and the both sides of placing frame inner wall bottom have been fixedly connected with card slot, and the present invention relates to generating equipment technical field.The convenient fixing device of the transformer, retainer ring has been fixedly connected with by the both sides of support plate, and fixed effect is stronger, dismounting is also very convenient, alleviates the installation burden of the personnel of work, slide plate is fixedly connected with by the first spring by the top of sliding slot inner wall, transformer can more be stablized, during long-time service, the stability of transformer ensure that, while security also greatly improves.

Description

A kind of convenient fixing device of transformer
Technical field
The present invention relates to the convenient fixing device of generating equipment technical field, specially a kind of transformer.
Background technology
Power generation refers to utilize dynamic power device by water energy, the thermal energy of fossil fuel (coal, oil, natural gas), nuclear energy etc. Prime energy be converted to the production process of electric energy, to supply the need of each department of national economy and people's lives, power generation now The use of fossil fuel is still main forms of electricity generation, but the resource of fossil fuel is few, and increasingly exhausted, the mankind are gradually more Begin to use the energy such as solar energy, wind energy, geothermal energy, ocean energy to generate electricity, transformer be using the principle of electromagnetic induction come Change the device of alternating voltage, main member is primary coil, secondary coil and iron core, and major function has:Voltage transformation, electric current Conversion, impedance conversion, isolation, voltage stabilizing, magnetic saturation transformer etc., can be divided into, according to use,:Power transformer and special transformer, Such as electric furnace change, rectification change, power frequency testing transformer, pressure regulator, mining change, audio-frequency transformer, intermediate-frequency transformer, high frequency transformation Device, impact transformer, instrument transformer, electronic transformer, reactor and mutual inductor etc., transformer is conversion alternating voltage, hands over Time-dependent current and the device of impedance, when being connected with alternating current in primary coil, exchange flux is just produced in iron core or magnetic core, is made secondary Voltage or electric current are induced in level coil, transformer is made of iron core or magnetic core and coil, and coil has two or more Winding, wherein connecing the winding of power supply primary coil, remaining winding is secondary coil.
In the installation process of transformer, due to the heavier-weight of transformer, many times it is required for when installation More numerous and diverse formality, just can ensure that the installation of transformer than stronger, ensures the safety used, but numerous and diverse process can wave Take many times, increase the burden of staff, the process of work can be largely effected on.
The content of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of convenient fixing device of transformer, solve and installed Journey is relatively complicated, the problem of influencing the progress of work.
In order to achieve the above object, the present invention is achieved by the following technical programs:A kind of convenient fixed dress of transformer Put, including support plate and transformer, the both sides of the support plate have been fixedly connected with retainer ring, and the internal activity of retainer ring Electric pole is connected with, the side of the retainer ring is fixedly connected with the bar that is screwed, and the both sides of transformer bottom are fixed Supporting block is connected with, placing frame is fixedly connected with the top of the support plate, and the both sides of placing frame inner wall bottom are fixed Card slot is connected with, the both sides that the support plate extends to card slot interior side have been fixedly connected with convex block, and the two of transformer Side has been fixedly connected with fixed plate, and side of the fixed plate away from transformer offers sliding slot, and two at the top of the support plate Side and it is connected with supporting rod positioned at the side of placing frame, the inside of the supporting rod one end and sliding slot away from support plate is slided Dynamic connection, and the both sides of sliding slot offer loose slot.
Preferably, the top of the sliding slot inner wall is fixedly connected with slide plate by the first spring, and the both sides of slide plate with The internal slide connection of loose slot, the top of the supporting rod and the bottom connection of slide plate touch.
Preferably, the both sides of the card slot inner wall have been fixedly connected with shell, and side of the shell away from card slot is run through There is arc block, the arc block, which is extended between one end of enclosure and the side of outer casing inner wall, is fixedly connected with the second bullet Spring.
Preferably, the both sides of the placing frame inner wall are fixedly connected with the active shell being adapted with slide plate, and activity Through there is movable plate, the side of the movable plate and the internal slide of loose slot connect for the both sides of shell.
Preferably, the movable plate extends to the top and bottom of active shell interior side and has been fixedly connected with fixed block, And side of the fixed block away from movable plate is fixedly connected with connecting rod, top and the bottom of the connecting rod have been fixedly connected with Pulley, and the top and bottom of active shell inner wall offers the movement slots being adapted with pulley.
Preferably, the connecting rod surface and be connected with slide bar away from the top and bottom of fixed block side, The 3rd spring is fixedly connected between the opposite side in the slide bar surface, and the top and bottom of active shell inner wall is fixed Be connected with supporting rack, be fixedly connected with connecting plate between the opposite side of support frame as described above, and slide bar away from connecting rod one End is flexibly connected with the side of connecting plate.
Beneficial effect
The present invention provides a kind of convenient fixing device of transformer.Possesses following beneficial effect:
(1), the convenient fixing device of the transformer, retainer ring has been fixedly connected with by the both sides of support plate, and solid The internal activity for determining ring is connected with electric pole, and the side of retainer ring is fixedly connected with the bar that is screwed, and transformer bottom Both sides have been fixedly connected with supporting block, and placing frame, and the both sides of placing frame inner wall bottom are fixedly connected with the top of support plate It has been fixedly connected with card slot, the both sides that support plate extends to card slot interior side have been fixedly connected with convex block, and transformer Both sides have been fixedly connected with fixed plate, and side of the fixed plate away from transformer offers sliding slot, both sides and position at the top of support plate Supporting rod is connected with the side of placing frame, the internal slide of supporting rod one end and sliding slot away from support plate connects, and And the both sides of sliding slot offer loose slot, numerous and diverse mounting means different from the past, installation procedure is greatly simplified, and installs meeting It is very easy, and fixed effect is stronger, and dismounting is also very convenient, alleviates the installation burden of the personnel of work, improves The efficiency of installation.
(2), the convenient fixing device of the transformer, cunning is fixedly connected with by the top of sliding slot inner wall by the first spring Plate, and the internal slide of the both sides of slide plate and loose slot connects, and the top of supporting rod and the bottom connection of slide plate touch, in card slot The both sides of wall have been fixedly connected with shell, and side of the shell away from card slot, through there is arc block, arc block extends to shell Second spring is fixedly connected between internal one end and the side of outer casing inner wall, the both sides of placing frame inner wall have been fixedly connected with The active shell being adapted with slide plate, and the both sides of active shell are through there is a movable plate, the side of movable plate and loose slot it is interior Portion is slidably connected, and dual fixation causes fixed effect more preferably, and transformer can more be stablized, and during long-time service, protects The stability of transformer is demonstrate,proved, while security also greatly improves.
(3), the convenient fixing device of the transformer, retainer ring has been fixedly connected with by the both sides of support plate, and solid The internal activity for determining ring is connected with electric pole, and the side of retainer ring is fixedly connected with the bar that is screwed, and transformer bottom Both sides have been fixedly connected with supporting block, and placing frame, and the both sides of placing frame inner wall bottom are fixedly connected with the top of support plate It has been fixedly connected with card slot, the both sides that support plate extends to card slot interior side have been fixedly connected with convex block, and transformer Both sides have been fixedly connected with fixed plate, and side of the fixed plate away from transformer offers sliding slot, both sides and position at the top of support plate Supporting rod is connected with the side of placing frame, the internal slide of supporting rod one end and sliding slot away from support plate connects, and And the both sides of sliding slot offer loose slot, the top of sliding slot inner wall is fixedly connected with slide plate, and slide plate by the first spring Both sides and the internal slide of loose slot connect, the top of supporting rod and the bottom connection of slide plate touch, and can fix different size Transformer, improve the use scope of fixing device, usability greatly enhances, the more operation of convenient operation personnel.
(4), the convenient fixing device of the transformer, the top and bottom of active shell interior side is extended to by movable plate Be fixedly connected with fixed block, and side of the fixed block away from movable plate is fixedly connected with connecting rod, the top of connecting rod with Bottom has been fixedly connected with pulley, and the top and bottom of active shell inner wall offers the movement slots being adapted with pulley, Connecting rod surface and the top and bottom away from fixed block side be connected with slide bar, the opposite side in slide bar surface it Between be fixedly connected with the 3rd spring, and the top and bottom of active shell inner wall has been fixedly connected with supporting rack, and supporting rack is opposite Side between be fixedly connected with connecting plate, and the one end of slide bar away from connecting rod is flexibly connected with the side of connecting plate, is become The top of depressor both sides is fixed by supporting rod, and the bottom of both sides is fixed by movable plate, improves transformer Stability and security.
Brief description of the drawings
Fig. 1 is schematic structural view of the invention;
Fig. 2 is the sectional view that the present invention places mount structure;
Fig. 3 is the side view of fixed plate structure of the present invention;
Fig. 4 is the sectional view of the movable shell structure of the present invention;
Fig. 5 is the sectional view of shell mechanism of the present invention.
In figure:1 support plate, 2 transformers, 3 retainer rings, 4 electric poles, 5 be screwed bar, 6 supporting blocks, 7 placing frames, 8 card Groove, 9 convex blocks, 10 fixed plates, 11 sliding slots, 12 supporting rods, 13 loose slots, 14 first springs, 15 slide plates, 16 shells, 17 arc blocks, 18 second springs, 19 active shells, 20 movable plates, 21 fixed blocks, 22 connecting rods, 23 pulleys, 24 movement slots, 25 slide bars, 26 the 3rd Spring, 27 supporting racks, 28 connecting plates.
Embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work Embodiment, belongs to the scope of protection of the invention.
- 5 are please referred to Fig.1, the present invention provides a kind of technical solution:A kind of convenient fixing device of transformer, including support Plate 1 and transformer 2, can fix different size of transformer 2, improve the use scope of fixing device, and usability increases By force, the more operation of convenient operation personnel, the both sides of support plate 1 have been fixedly connected with retainer ring 3, and the inside of retainer ring 3 Be connected with electric pole 4, the side of retainer ring 3 is fixedly connected with the bar 5 that is screwed, the use of the bar 5 that is screwed be in order to Retainer ring 3 is fixed on electric pole 4, height of the retainer ring 3 on electric pole 4 can also be adjusted, greatly according to different demands It is big to improve the scope of application, and the both sides of 2 bottom of transformer have been fixedly connected with supporting block 6, and the top of support plate 1, which is fixed, to be connected Placing frame 7 is connected to, the both sides of 7 inner wall of placing frame are fixedly connected with the active shell 19 being adapted with slide plate 15, and active shell Through there is movable plate 20, movable plate 20 can be stuck in loose slot 13, pass through by inside Compressive activities plate 20 for 19 both sides The elastic force of 3rd spring 26 so that the inner wall for propping up loose slot 13 of movable plate 20 tightly, plays a fixed effect so that Transformer 2 is more stablized, and the top and bottom that movable plate 20 extends to 19 interior side of active shell has been fixedly connected with fixation Block 21, and side of the fixed block 21 away from movable plate 20 is fixedly connected with connecting rod 22, it is 22 surface of connecting rod and remote solid The top and bottom for determining 21 side of block is connected with slide bar 25, and is fixedly connected between the opposite side in 25 surface of slide bar Three springs 26, and the top and bottom of 19 inner wall of active shell has been fixedly connected with supporting rack 27, and dual fixation causes fixed effect More preferably, transformer 2 can more be stablized fruit, during long-time service, ensure that the stability of transformer 2, while safety Property also greatly improves, and connecting plate 28 is fixedly connected between the opposite side of supporting rack 27, and slide bar 25 is away from connecting rod 22 One end be flexibly connected with the side of connecting plate 28, the top of connecting rod 22 has been fixedly connected with pulley 23, pulley 23 with bottom Use, substantially increase flexibility and the convenience of buffering so that be buffered in much smoother when progress, reach high efficiency buffer Effect, and the top and bottom of 19 inner wall of active shell offers the movement slots 24 being adapted with pulley 23, movable plate 20 Side be connected with the internal slide of loose slot 13, and the both sides of 7 inner wall bottom of placing frame have been fixedly connected with card slot 8, card The both sides of 8 inner wall of groove have been fixedly connected with shell 16, and side of the shell 16 away from card slot 8 is through having arc block 17, arc Second spring 18, support plate 1 are fixedly connected between the side for 16 inner wall of one end and shell that block 17 is extended to inside shell 16 The both sides for extending to 8 interior side of card slot have been fixedly connected with convex block 9, and numerous and diverse mounting means different from the past, will install journey Sequence greatly simplifies, and installation can be very easy, and fixed effect is stronger, and dismounting is also very convenient, alleviates the people of work The installation burden of member, improves the efficiency of installation, and the both sides of transformer 2 have been fixedly connected with fixed plate 10, fixed plate 10 Side away from transformer 2 offers sliding slot 11, and the top of 11 inner wall of sliding slot is fixedly connected with slide plate 15 by the first spring 14, And the both sides of slide plate 15 are connected with the internal slide of loose slot 13, the top of supporting rod 12 and the bottom connection of slide plate 15 touch, The both sides at the top of support plate 1 and supporting rod 12 is connected with positioned at the side of placing frame 7, transformer passes through at the top of 2 both sides Supporting rod 12 is fixed, and the bottom of both sides is fixed by movable plate 20, improves the stability and safety of transformer 2 Property, the one end of supporting rod 12 away from support plate 1 is connected with the internal slide of sliding slot 11, and the both sides of sliding slot 11 offer work Dynamic groove 13, is connected to logical between loose slot 13 and sliding slot 11, improve fixed effect.
During work, transformer 2 is placed on to the inside of placing frame 7, by pushing arc block 17 in second spring 18 Extruding under move inward, when convex block 9 extrude arc block 17 bottom when, arc block 17 can eject, carry out it is spacing, then will branch Strut 12 is stuck in the bottom of slide plate 15, is extruded using the first spring 14, then movable plate 20 is stuck in loose slot 13 Portion, movable plate 20 can inwardly be press-connected bar 22 so that pulley 23 is slided in the inside of movement slots 24, and the 3rd spring 26 rises To the effect of a buffering, this completes fixation.
It should be noted that herein, relational terms such as first and second and the like are used merely to a reality Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation In any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant are intended to Non-exclusive inclusion, so that process, method, article or equipment including a series of elements not only will including those Element, but also including other elements that are not explicitly listed, or further include as this process, method, article or equipment Intrinsic key element.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with Understanding without departing from the principles and spirit of the present invention can carry out these embodiments a variety of changes, modification, replace And modification, the scope of the present invention is defined by the appended.

Claims (7)

1. a kind of convenient fixing device of transformer, including support plate (1) and transformer (2), it is characterised in that:The support plate (1) both sides have been fixedly connected with retainer ring (3), and the internal activity of retainer ring (3) is connected with electric pole (4), described solid The side for determining ring (3) is fixedly connected with the bar that is screwed (5), and the both sides of transformer (2) bottom have been fixedly connected with support Block (6), is fixedly connected with placing frame (7) at the top of the support plate (1), and the both sides of placing frame (7) inner wall bottom are solid Surely card slot (8) is connected with, the both sides that the support plate (1) extends to card slot (8) interior side have been fixedly connected with convex block (9), And the both sides of transformer (2) have been fixedly connected with fixed plate (10), side of the fixed plate (10) away from transformer (2) is opened Equipped with sliding slot (11), both sides at the top of the support plate (1) and supporting rod is connected with positioned at the side of placing frame (7) (12), the one end of the supporting rod (12) away from support plate (1) is connected with the internal slide of sliding slot (11), and sliding slot (11) Both sides offer loose slot (13).
A kind of 2. convenient fixing device of transformer according to claim 1, it is characterised in that:Sliding slot (11) inner wall Top slide plate (15) is fixedly connected with by the first spring (14), and the both sides of slide plate (15) and the inside of loose slot (13) It is slidably connected, the top of the supporting rod (12) and the bottom connection of slide plate (15) touch.
A kind of 3. convenient fixing device of transformer according to claim 1, it is characterised in that:Card slot (8) inner wall Both sides be fixedly connected with shell (16), and side of the shell (16) away from card slot (8) is through there is arc block (17), described Arc block (17) extends between the internal one end of shell (16) and the side of shell (16) inner wall and is fixedly connected with second spring (18)。
A kind of 4. convenient fixing device of transformer according to claim 1, it is characterised in that:In the placing frame (7) The both sides of wall are fixedly connected with the active shell (19) being adapted with slide plate (15), and the both sides of active shell (19) are through having Movable plate (20), the side of the movable plate (20) are connected with the internal slide of loose slot (13).
A kind of 5. convenient fixing device of transformer according to claim 4, it is characterised in that:The movable plate (20) is prolonged The top and bottom for extending active shell (19) interior side has been fixedly connected with fixed block (21), and fixed block (21) is away from living The side of movable plate (20) is fixedly connected with connecting rod (22), and top and the bottom of the connecting rod (22) have been fixedly connected with pulley (23), and the top and bottom of active shell (19) inner wall offers the movement slots (24) being adapted with pulley (23).
A kind of 6. convenient fixing device of transformer according to claim 1-5, it is characterised in that:The connecting rod (22) The top and bottom of surface and remote fixed block (21) side is connected with slide bar (25), slide bar (25) surface phase To side between be fixedly connected with the 3rd spring (26), and the top and bottom of active shell (19) inner wall has been fixedly connected with Supporting rack (27), is fixedly connected with connecting plate (28) between the opposite side of support frame as described above (27), and slide bar (25) is remote One end of connecting rod (22) is flexibly connected with the side of connecting plate (28).
A kind of 7. convenient fixing means of transformer, it is characterised in that:Transformer 2 is placed on to the inside of placing frame 7, under Pressure causes arc block 17 to be moved inward under the extruding of second spring 18, when convex block 9 extrudes the bottom of arc block 17, arc block 17 can eject, and progress is spacing, and then supporting rod 12 is stuck in the bottom of slide plate 15, extruded using the first spring 14, then Movable plate 20 is stuck in the inside of loose slot 13, movable plate 20 can inwardly be press-connected bar 22 so that pulley 23 is in movement slots 24 Inside slided, the 3rd spring 26 play the role of one buffering, this completes fixation.
CN201810068484.1A 2018-01-24 2018-01-24 Convenient fixing device and method for transformer Active CN107993805B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810068484.1A CN107993805B (en) 2018-01-24 2018-01-24 Convenient fixing device and method for transformer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810068484.1A CN107993805B (en) 2018-01-24 2018-01-24 Convenient fixing device and method for transformer

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CN107993805A true CN107993805A (en) 2018-05-04
CN107993805B CN107993805B (en) 2023-12-22

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113270261A (en) * 2021-07-21 2021-08-17 江西远大科技有限公司 Transformer substation is with fixed transformer core group of fast assembly
CN116013667A (en) * 2022-11-16 2023-04-25 南通艺顺鹏电气有限公司 Auxiliary clamp for butt joint of transformer shell

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4781348A (en) * 1987-07-31 1988-11-01 A. B. Chance Company Adjustable banded aluminum transformer mount
JP2006340473A (en) * 2005-06-01 2006-12-14 Chugoku Electric Power Co Inc:The Transformer platform
JP2008130881A (en) * 2006-11-22 2008-06-05 Tokyo Electric Power Co Inc:The Pole transformer supporter
CN106856122A (en) * 2015-12-08 2017-06-16 重庆市涪陵区腾图广告有限公司 A kind of fixed mount for being easy to distribution transformer to install
CN206401133U (en) * 2017-01-20 2017-08-11 江苏新坝电气有限公司 A kind of oil-immersed type non-crystal alloy transformer
CN107068336A (en) * 2017-06-19 2017-08-18 长兴恒业达电子有限公司 A kind of box type transformer and its installation method being easily installed
CN206726903U (en) * 2017-05-15 2017-12-08 李荣兴 A kind of easy-to-mount oil-filled transformer
CN206877784U (en) * 2017-06-07 2018-01-12 朱英凯 A kind of transformer with shock-absorbing function
CN208061787U (en) * 2018-01-24 2018-11-06 安吉晶圣光伏发电有限公司 A kind of convenient fixing device of transformer

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4781348A (en) * 1987-07-31 1988-11-01 A. B. Chance Company Adjustable banded aluminum transformer mount
JP2006340473A (en) * 2005-06-01 2006-12-14 Chugoku Electric Power Co Inc:The Transformer platform
JP2008130881A (en) * 2006-11-22 2008-06-05 Tokyo Electric Power Co Inc:The Pole transformer supporter
CN106856122A (en) * 2015-12-08 2017-06-16 重庆市涪陵区腾图广告有限公司 A kind of fixed mount for being easy to distribution transformer to install
CN206401133U (en) * 2017-01-20 2017-08-11 江苏新坝电气有限公司 A kind of oil-immersed type non-crystal alloy transformer
CN206726903U (en) * 2017-05-15 2017-12-08 李荣兴 A kind of easy-to-mount oil-filled transformer
CN206877784U (en) * 2017-06-07 2018-01-12 朱英凯 A kind of transformer with shock-absorbing function
CN107068336A (en) * 2017-06-19 2017-08-18 长兴恒业达电子有限公司 A kind of box type transformer and its installation method being easily installed
CN208061787U (en) * 2018-01-24 2018-11-06 安吉晶圣光伏发电有限公司 A kind of convenient fixing device of transformer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113270261A (en) * 2021-07-21 2021-08-17 江西远大科技有限公司 Transformer substation is with fixed transformer core group of fast assembly
CN116013667A (en) * 2022-11-16 2023-04-25 南通艺顺鹏电气有限公司 Auxiliary clamp for butt joint of transformer shell
CN116013667B (en) * 2022-11-16 2023-10-24 国网安徽省电力有限公司祁门县供电公司 Auxiliary clamp for butt joint of transformer shell

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