JP2888711B2 - Line production flow of large electrical equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for producing large-sized electric equipment such as transformers in a line.

[0002]

2. Description of the Related Art FIG. 11 is an explanatory view showing an internal assembling process, an external assembling process, and a testing process of a conventional core type transformer. In the figure, 1 is a coil insertion, 2 is an upper yoke core insertion, 3 is an upper end frame mounting, 4 is a tap changer, a lead mounting, 5 is a wiring connection, and 6 and 7 are vacuum heating and drying performed in a drying furnace 15. Oil impregnation, 8 is finishing, 9 is tank filling, cover welding, 10 is parts, instrument mounting, 11 is vacuum evacuation, lubrication,
These are hydraulic and wiring operations, and 12 is a test.

Here, the operations from the coil insertion 1 to the finishing 8 are performed by an internal assembly process 16, a tank insertion, and a cover welding 9.
Operations from vacuum evacuation, lubrication, oil pressure, and wiring 11 are the external assembly process 17, and the test 12 is the test process 18. The operations from the coil insertion 1 to the wiring 5 and the finishing 8 are performed in the dustproof and air conditioning room operation 13.

[0004] production method of the above-mentioned transformer, stationary production system and transport by the crane (Material Handling: MH) a combination of, the work up coil insertion 1 distributing wire connection 5, put the tank, a cover welding 9 -Evacuation, lubrication, oil pressure, work up to wiring 11, and test 12 are stationary production system 14, wiring 5 → vacuum heating and drying 6, oil impregnation 7 → finishing 8, finishing 8 → tank putting, cover The conveyance during welding 9, evacuation, lubrication, oil pressure, wiring 11 → test 12 is crane movement 22.

Regarding the oil treatment state of the insulating material, the work up to vacuum heating and drying 6 is the unoiled state 19, the oil impregnation 7 to vacuuming, the lubrication, the oil pressure, and the wiring 11 are the work up to vacuuming. Oil impregnated state 20, evacuation, lubrication, oil pressure,
The operation after the lubrication in the wiring 11 is the oil immersion state 21.

Further, regarding the moisture in the insulator,
Most of them are removed by vacuum heating and drying 6 in the drying furnace 15, and the oil is impregnated immediately after the drying. Therefore, only a small amount of moisture is absorbed thereafter, and in the oil immersion state 21, moisture absorption does not progress. The most time-consuming of the above-described steps is the vacuum heating drying 6 and the oil impregnation 7, which takes 2 to 3 days.

[0007]

As described above, in the internal assembling process, the external assembling process, and the test process of the conventional core-type transformer, since the vacuum heating drying 6 and the oil impregnation 7 do not meet the tact per day, as described above. However, there is a problem that it is configured in an off-line system and the construction period is long. In addition, there is a problem that productivity is low, such as waiting for the crane, because the apparatus is configured to be transported by the crane.

The present invention has been made in order to solve the above-mentioned problems, and the drying step is made one day by vacuum heating drying and the prevention of moisture absorption in the post-process, thereby shortening the construction period and reducing the work in process by in-line. It is another object of the present invention to obtain a line-type flow production system for large-sized electrical equipment that can be crane-less and improve productivity.

In addition, two drying furnaces for performing vacuum heating drying and oil impregnation in two days are arranged in-line, and the drying furnace has a tact time of two days. It is an object of the present invention to obtain a line-type flow production system for large-sized electric equipment capable of shortening and reducing a work-in-progress and improving productivity by eliminating a crane.

Further, the furnace for performing vacuum heating drying and oil impregnation is separated, and each is treated with one-day tact, and both are incorporated in-line in series to form a one-day tact production line. It is an object of the present invention to obtain a line-type flow production system for large-sized electric equipment capable of reducing the load and improving productivity by eliminating a crane.

[0011]

According to a first aspect of the present invention, there is provided a line-type flow production system for large-sized electric equipment, comprising a coil insertion of a large-sized electric equipment, an upper yoke core insertion, an upper end frame mounting,
Internal assembly process consisting of tap changer and lead mounting, wiring, vacuum heating drying and finishing work, tank filling,
Cover welding, mounting and vacuuming of parts and instruments, lubrication,
The following steps (1) to (6) are required for the external assembly process consisting of hydraulic and wiring work and the test process, and a drying oven for (1) vacuum heating and drying is arranged inline. , (2)
No oil impregnation immediately after vacuum heating and drying, (3) Finishing work is dustproof, work in air-conditioned room, (4) Put in tank,
Supply low dew point dry air during cover welding work and parts and instrument mounting work. (5) Vacuuming immediately after parts and instrument mounting work. (6) Dedicated transport for each process It is characterized by performing line flow production regulated by tact for one day in the order of each of the above processes using an apparatus.

According to a second aspect of the present invention, there is provided a line production flow system for large-sized electric equipment, wherein a coil insertion of a large-sized electric equipment, an upper yoke iron core insertion, an upper end frame attachment, a tap changer and a lead attachment, wiring, vacuum Internal assembly process consisting of heat drying, oil impregnation and finishing work, tank filling, cover welding,
The following steps (1) to (6) are required for the external assembly process consisting of mounting and vacuuming, lubrication, oil pressure, and wiring of parts and instruments, and the following processes (1) to (1) vacuum heating Two or more drying ovens for drying and oil impregnation are arranged in parallel, (2) Two or more drying ovens are used to carry in and out the object to be dried one day apart, and (3) Finishing work is dustproof and air-conditioned. (4) Supply low dew point dry air during tank filling, cover welding, and mounting parts and instruments. (5)
Vacuum immediately after attaching parts and instruments, (6)
The present invention is characterized in that a line-by-line flow production controlled by one-day tact is performed in the order of each of the above-mentioned steps using a dedicated transfer device for the transfer between the steps.

Further, according to a third aspect of the present invention, there is provided a line production flow system for large-sized electric equipment, wherein a coil insertion of a large-sized electric equipment, an upper yoke core insertion, an upper end frame mounting, a tap changer and a lead mounting, wiring, vacuum Internal assembly process consisting of heating and drying, oil impregnation and finishing operations, external assembly process consisting of tank filling, cover welding, mounting and vacuuming of parts and instruments, lubrication, hydraulic pressure, wiring, and test processes To
With the following requirements (1) to (5), (1) a drying furnace for performing vacuum heating and drying and an impregnation furnace for performing oil impregnation are arranged in series,
(2) Finishing work is dustproof and air conditioning indoor work. (3)
Supply low-dew-point dry air during tank filling, cover welding, and parts / instrument mounting work. (4) Vacuuming immediately after parts / meters mounting work. (5) Dedicated for transport between processes. It is characterized by performing a line flow production regulated by a tact for one day in the order of each of the above processes using a transport device.

[0014]

According to a first aspect of the present invention, there is provided a line production flow system for large-sized electric equipment, wherein a drying furnace is arranged in-line,
The oil impregnation immediately after drying is not performed, and the line from the internal assembly process to the test process is regulated by one-day tact, so that the process from the assembly process to the test process is lined and produced. In addition, by making the finishing process work in an air-conditioned room, supplying low-dew-point dry air during the external assembly process to prevent moisture absorption of insulators, and to lengthen the vacuuming time before lubrication. After drying, moisture absorbed is removed. Further, by using a dedicated transfer device to transfer between each process, a crane becomes unnecessary.

According to a second aspect of the present invention, a drying furnace for performing vacuum heating drying and oil impregnation is arranged in parallel in a line, and a tact time of one day from an internal assembly process to a test process is achieved. With the production line regulated in the above, the process from the assembly process to the test process is lined and produced. In addition, a crane is not required by transferring between the processes using a dedicated transfer device.

Further, according to a third aspect of the present invention, a drying furnace and an impregnating furnace are arranged in series in a line, and a line from the internal assembly to the test process is regulated by one cycle per day. As a result, the process from the assembly process to the test process is lined and produced. In addition, since a dedicated transfer device is used to transfer between the processes, no crane is required.

[0017]

【Example】

Embodiment 1 FIG. Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. In FIG. 1, 1A is a coil insertion, 2A is an upper yoke iron core insertion, 3A is an upper end frame mounting, 4A is a tap changer, a lead mounting, 5A is a wiring connection, 6A is a vacuum heating drying performed in a drying furnace 15A, 8A Is finishing, 9A is tank filling, cover welding, 10A is parts and instrument mounting, 11A is vacuuming, lubrication, oil pressure, wiring work, and 12A is a test.

Here, the coil insertion 1A to finishing 8A
The process up to the internal assembly process 16, the tank insertion, cover welding 9A to vacuum evacuation, lubrication, hydraulic pressure, wiring 11A are the external assembly process 17, and the test 12A is the test process 18.
It is. The steps from coil insertion 1A to wiring 5A are performed in dustproof and air-conditioned room work 13, and the finishing 8A process is performed in dustproof and air-conditioned room work 13A.

Further, the work from tank insertion, cover welding 9A to parts and instrument mounting 10A is -40.
The low dew point dry air supply 23 at a temperature of not more than ° C. prevents moisture absorption of the insulator. Further, a vacuum evacuation 24 is performed immediately after the parts and the instrument are mounted 10A until lubrication, so that moisture absorbed after drying is removed.

The production method is as follows: coil insertion 1A to test 12A
Each process from the internal assembly process up to the test process is divided into steps so as to have a tact time of one day, and a line production system 25 is implemented. In addition, the transfer in each step is performed using a dedicated transfer device. For example, the chill tank skater is used in the internal assembly step 16 and the external assembly step 17 is tested.
In the test process 18 , an electric bogie is adopted to achieve craneless operation.

2 to 4 are explanatory diagrams of examples of the arrangement of the drying oven 15A. In each of the figures, 26 is a door, 27 is a transport rail, 28 is a turntable, and the arrows in the drawings indicate the flow direction of the line. Show. In Example 1 described above, the drying furnace 15A is arranged in-line, oil impregnation immediately after drying is not performed, and the line from the internal assembly process to the test process is regulated by one-day tact. From the test process to the test process.

In the first embodiment, with respect to the drying furnace 15A,
As shown in FIG. 2, by adopting a tunnel type drying furnace 15A having doors 26 provided on both sides of the drying furnace, the drying furnace 15A can be disposed in a straight line. , While 4 to 5 units were dried together, the drying process was incorporated into the line and inlined, each process was lined up, products were arranged in the order of process, and one assembly was performed within the tact regulated period In addition, it is possible to construct a single-piece production line for simultaneously moving to the next step and producing.

In FIG. 2, the drying oven 15A is arranged in a straight line. However, as shown in FIG. 3, the drying oven 15A may be branched from the straight line via a turntable 28, or may be arranged as shown in FIG. As such, they may be arranged separately from the line.

In the first embodiment, the finishing process is performed in an air-conditioned room, and low-dew-point dry air is supplied during the external assembling process to prevent the insulator from absorbing moisture, and to reduce the vacuum before lubrication. Since the draw time was extended,
After drying, the moisture absorbed is removed, which is not much different from that of the conventional method. In addition, since a dedicated transfer device is used to transfer between the processes, a crane is not required.

Therefore, the following effects are also obtained. a. Standardization of design and work and complete control of the internal assembly line for air conditioning ensure stable quality. b. Production lead time is reduced. c. Productivity can be improved by expanding the jigs and tools, arranging them properly, and eliminating crane waiting by eliminating crane. d. The flow of the product can be understood at a glance, and the problems become apparent, which makes the management easier. e. Improve the workplace environment, such as avoiding contact with oil and eliminating heavy loads.

Embodiment 2 FIG. Next, a second embodiment will be described with reference to the drawings. In FIGS. 5 to 7, 6B and 7B are drying ovens 15.
This is the work of vacuum heating drying and oil impregnation performed in B. Others are the same as those described so far.

In the second embodiment, the drying furnace 15B for performing the vacuum heating drying 6B and the oil impregnation 7B is arranged in-line in parallel, and the line from the internal assembling process to the test process is regulated by one-day tact. As a result, the process from the assembly process to the test process is lined and produced. Example 2
The required number of days in the drying oven 15B is 1 for vacuum heating drying 6B.
As shown in FIG. 6, the loading of the material to be dried into and out of the drying furnace 15B is performed for one day by the two drying furnaces as shown in FIG. If the shift is performed on a day-by-day basis, it is possible to configure a line-to-line production of one tact per day for the entire line.

When the required number of days in the drying furnace 15B is three, it is needless to say that three drying furnaces can be arranged in parallel, and if the above-described operation is performed, a one-day tact line flow production can be constituted. No. In addition, since a dedicated transfer device is used to transfer between the processes, no crane is required.
In the above embodiment, the drying furnace may be arranged via a turntable 28 as shown in FIG. 6, or may be arranged separately from the line as shown in FIG.

Embodiment 3 FIG. Next, a third embodiment will be described with reference to the drawings. 8 to 10, 6C is a vacuum heating drying performed in the drying furnace 15C, and 7C is an oil impregnation operation performed in the impregnation furnace 29. Others are the same as those described so far.

In the third embodiment, the furnaces for performing vacuum heating drying 6C and oil impregnation 7C are special furnaces 15C and 29C, respectively.
By arranging them in series in-line to form a line in which the process from the internal assembly process to the test process is regulated by one-day tact, the process from the assembly process to the test is lined and produced.

In Example 3, the required number of days in the drying furnace was
Vacuum heat drying 6C for 1 day and oil impregnated 7C for 1 day 2
For example, assuming that two days for vacuum heating drying 6C and three days for oil impregnation 7C for a total of three days, for example,
It is needless to say that if two drying furnaces 15C for performing C are arranged in parallel as shown in FIG. 6 or FIG.

Further, as in the first embodiment, a crane becomes unnecessary by transferring between the respective steps using a dedicated transfer device. As shown in FIG. 10, the drying furnace and the impregnation furnace in the above embodiment may be configured such that the two furnaces are united and a partition 30 that automatically opens and closes is provided at an intermediate portion.

[0033]

As described above, according to the first aspect of the present invention, the drying furnace for performing the vacuum heating and drying is arranged in-line so that the oil impregnation immediately after the vacuum heating and drying is not performed, and the finishing step is performed. Dust proof, air conditioning room work, supply low dew point dry air during the external assembly process, elongate the vacuum before lubrication, use a dedicated transfer device for transfer between each process, It can be configured to perform flow production on a line, which regulates the assembly process to the test process in one tact per day. This has the effect of improving work efficiency, improving transportation by using no crane, reducing man-hours, and shortening the manufacturing period. is there.

According to the second aspect of the present invention, two or more drying furnaces for performing vacuum heating drying and oil impregnation are arranged in line in parallel, and the objects to be dried are carried in the two or more drying furnaces one day apart.
Unloading is performed, and a dedicated transfer device is used for transfer between each process.
It can be configured to carry out line production flow regulated by tact per day, which has the effects of improving work efficiency, improving transportation by using no crane, reducing man-hours, and shortening the manufacturing period. Also, after the oil impregnation after drying, the finishing process was dustproof, air conditioning room work, so that the low dew point dry air was supplied during the external assembly process, and the vacuum evacuation before lubrication was performed for a long time, There is an effect that the water content can be further reduced as compared with the conventional method.

Further, according to the third aspect, furnaces for performing vacuum heating and drying and oil impregnation are arranged in series as in-line furnaces as dedicated furnaces, respectively. It can be configured to perform flow production on a line, which regulates the assembly process to the test process in one tact per day. This has the effect of improving work efficiency, improving transportation by using no crane, reducing man-hours, and shortening the manufacturing period. is there. Further, since the drying furnace and the impregnation furnace are arranged in series in-line, there is an effect that the transfer method before and after the furnace can be improved as compared with the method according to claim 2. Furthermore, after the oil impregnation after drying, the finishing process is dustproof, air conditioning room work,
Since the low dew point dry air is supplied during the external assembly process and the evacuation before lubrication is performed for a long time, the water content can be further reduced as compared with the conventional method.

[Brief description of the drawings]

FIG. 1 is a process explanatory view showing Embodiment 1 of the present invention.

FIG. 2 is an explanatory view illustrating the arrangement of a drying furnace according to the first embodiment of the present invention.

FIG. 3 is a layout explanatory view of a drying furnace showing another example according to the first embodiment of the present invention.

FIG. 4 is a layout explanatory view of a drying furnace showing another example according to the first embodiment of the present invention.

FIG. 5 is a process explanatory view showing a second embodiment of the present invention.

FIG. 6 is a layout explanatory view of a drying furnace according to a second embodiment of the present invention.

FIG. 7 is a layout explanatory view of a drying furnace showing another example according to Embodiment 2 of the present invention.

FIG. 8 is a process explanatory view showing a third embodiment of the present invention.

FIG. 9 is an explanatory view showing the arrangement of a drying furnace and an impregnation furnace according to a third embodiment of the present invention.

FIG. 10 is an explanatory view of the arrangement of a drying furnace and an impregnation furnace showing another example according to Embodiment 3 of the present invention.

FIG. 11 is an explanatory view of a conventional process.

[Explanation of symbols]

 1A Coil insertion 2A Upper yoke core insertion 3A Upper end frame mounting 4A Tap changer, lead mounting 5A Wiring 6A Vacuum heating drying 6B Vacuum heating drying 6C Vacuum heating drying 7B Oil impregnation 7C Oil impregnation 8A Finishing 9A Tank case, cover welding 10A Parts, instrument mounting 11A Vacuuming, lubrication, oil pressure, wiring 12A Testing 13A Dustproofing, air conditioning indoor work 15A Drying furnace 15B Drying furnace 15C Drying furnace 16 Internal assembly process 17 External assembly process 18 Test process 23 Low dew point dry air supply 24 Vacuum vacuum 25 Flow production method 27 Transfer rail 29 Impregnation furnace

──────────────────────────────────────────────────の Continued on front page (72) Inventor Minoru Tamura 651 Tenwa, Ako City Mitsubishi Electric Corporation Ako Works (72) Inventor Hiroharu Sakaguchi 651 Tenwa Ako City Inside Mitsubishi Electric Ako Works (56) References JP-A-2-91110 (JP, A) JP-A-56-164507 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01F 27/00, 41/00

Claims (3)

(57) [Claims] 1. An internal assembly process consisting of coil insertion of a large electric device, insertion of an upper yoke core, installation of an upper end frame, installation of a tap changer and a lead, wiring, vacuum heating and drying, and finishing of a tank. The following steps (1) to (6) are used for the external assembly process consisting of cover welding, mounting of parts and instruments, vacuuming, lubrication, hydraulic pressure, wiring, and the test process.
(1) Arrange the drying furnace for vacuum heating and drying in-line, (2) Do not impregnate oil immediately after vacuum heating and drying, (3) Finish work is dustproof and work in air-conditioned room (4) Supply low dew point dry air during tank filling, cover welding, and parts and instrument mounting work, (5) Vacuum immediately after parts and meter mounting work, (6) Between each process A line production flow system for large-sized electrical equipment, wherein a line production process is carried out in the order of each of the above-mentioned steps, which is regulated by a tact per day, using a dedicated conveyance device for conveyance. 2. An internal assembly process comprising coil insertion of a large electric device, insertion of an upper yoke core, installation of an upper end frame, installation of a tap changer and a lead, wiring, vacuum heating and drying, oil impregnation and finishing. The following steps are used for the external assembly process, which consists of tank insertion, cover welding, mounting of parts and instruments, vacuuming, lubrication, hydraulic pressure, and wiring, and the testing process.
With the requirements of (1) to (6), (1) Two or more drying ovens for vacuum heating drying and oil impregnation are arranged in parallel. (2) Two or more drying ovens are staggered by one day. (3) Finishing work is dustproof and air conditioning room work. (4) Supply low dew point dry air during tank filling, cover welding work and parts and instrument mounting work. 5) Vacuuming is performed immediately after the parts and gauges are attached. (6) Use a special transfer device for transfer between each process. A large-scale electrical equipment production line. 3. An internal assembly process consisting of coil insertion of a large electric device, insertion of an upper yoke core, installation of an upper end frame, installation of a tap changer and a lead, wiring, vacuum heating and drying, oil impregnation and finishing. The following steps are used for the external assembly process, which consists of tank insertion, cover welding, mounting of parts and instruments, vacuuming, lubrication, hydraulic pressure, and wiring, and the testing process.
(1) With the requirements of (1) to (5), (1) A drying furnace for vacuum heating and drying and an impregnation furnace for oil impregnation are arranged in series. (2) Finishing work is dustproof and air conditioning indoor work. (3) Supply low-dew-point dry air during tank filling, cover welding, and parts and instrument mounting work, (4) Vacuuming immediately after mounting parts and instruments, (5) Between processes A line production flow system for large-sized electrical equipment, wherein a line production process is carried out in the order of each of the above-mentioned steps, which is regulated by a tact per day, using a dedicated conveyance device for conveyance.