JPH08172023A - Curing oven for casting molded coil - Google Patents

Abstract

PURPOSE: To continuously perform the resin molding work and curing work for forming a molded coil at regular time intervals. CONSTITUTION: A curing oven for casting molded coil is constituted of a standby drying oven 17, casting section 18, first curing oven 19, face plate disassembling section 20, and second curing oven 21 by using a traverser which carries a pallet 4 carrying a work 2 and carrying path 7 in the oven as a carrying base. The work 2 is successively thrown in in turn three rows of carrying paths in the oven against the ovens and discharged from the exits of the ovens in turn. Therefore, the efficiency is improved and the contrivance can be reduced by the assembly-line production.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold coil casting and curing furnace capable of continuous tact production by casting a mold coil through heating and curing.

[0002]

2. Description of the Related Art A mold coil used for a transformer or the like has a structure in which a coil portion is covered with a mold resin which is an insulator. This mold coil is formed by injecting a liquid resin into a mold containing the coil and curing the resin by heating.
Generally, the casting work for the mold coil is a batch method by manual work, and the liquid is prepared and injected. Therefore, in the pre-drying furnace for the mold and the mold coil in the preceding and following steps, the first heating and hardening furnace, and the second heating and hardening furnace are also put on the trolley in the same manner and the inside of the furnace is batch-processed. It is put into and cured by heating.

[0003]

In the batch method, the number of production units pulsates, and in the heating furnace, the furnace temperature is raised and lowered in a heating heat cycle pattern, which causes a problem in energy saving.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a mold coil casting and curing furnace which can continuously perform resin casting and curing of a mold coil at regular time intervals.

[0005]

In order to achieve the above object, a mold coil casting and curing furnace according to the present invention comprises a drying furnace for heating a work consisting of a mold for injecting a mold resin and a coil, and the drying furnace. A casting part for injecting the molding resin into the workpiece discharged from the work, and heating for curing the molding resin injected in the casting part.
And a second heating furnace for further curing the mold resin of the workpiece taken out of the first heating furnace and having the face plate removed, and the drying furnace, the first heating furnace, and the second heating furnace. Each of the heating furnaces has a tunnel-shaped furnace structure, and at least one predetermined number unit of the work pieces taken in from the inlet is provided with the work pieces at a constant time interval by at least a pitch corresponding to the size of the work pieces. It contains at least one row of transport paths that are successively advanced toward the exit.

In this casting curing furnace, preferably, at least one of the drying furnace, the first heating furnace, and the second heating furnace has a plurality of rows of transfer paths that can be independently transferred. The predetermined number of workpieces are loaded into the wheel numbers on the plurality of rows of transport paths.

At least one of the drying furnace, the first heating furnace, and the second heating furnace may have two or more chambers whose temperature is controlled at a constant temperature for each passage position therein. For example, since the temperature in the furnace is changed stepwise and a predetermined heat cycle heating is performed by passage, the partition of each chamber in the furnace is partitioned by a shutter or a heat insulating device such as goodwill.

Preferably, a casting device for automatically measuring and mixing the two liquids is arranged between the predrying furnace and the first heating furnace so that the mold resin can be injected with a constant tact.

In order to increase the heat transfer efficiency to the mold coil in the furnace, hot air or cold air is blown from the lower side of the furnace as well. Therefore, ventilation holes are provided on the surface of the pallet on which the mold coil is placed. Good.

[0010]

[Operation] Based on the transport path that transports with a constant tact,
A tunnel-shaped pre-drying furnace covering the transportation path, and
The mold coil is continuously produced with a constant takt time by the casting portion of the molding resin arranged in the next step of the heating furnace, the second heating furnace, and the preliminary drying furnace.

Since the heating time for the resin is limited and the production tact time is also fixed, it requires a long heating time, and if the production tact time is short, a large number of stations are required, which is inevitable. The furnace length becomes longer. As a solution to this problem, the length of the furnace can be shortened by providing a plurality of rows of conveying paths in the furnace and introducing the mold coil of the pallet by the traverse by the wheel.

By dividing the room in the furnace into two or more rooms,
Predetermined heat cycle heating becomes possible. As a partition, a shutter or goodwill-shaped heat insulating cloth can be used to stably set and maintain the temperature without interfering with each other.

The ventilation holes of the pallet allow ventilation from the lower side of the coil to improve heat transfer efficiency.

[0014]

EXAMPLES Examples of the mold coil casting and curing furnace of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows the appearance of the entire system of the mold coil casting and curing furnace of this embodiment. This system includes a preliminary drying oven 17, a casting unit 18, a first curing oven 19, a face plate separating unit 20, and a second curing oven 21. Predrying oven 1
7, a stack conveyor 3, a charging hoist 5,
And a traverser 61 are arranged, and a traverser 62 is arranged between the traverser 62 and the casting unit 18. Casting part 18
A traverser 63 is disposed between the first curing furnace 19 and the first curing furnace 19, and a traverser 64 is disposed downstream of the first curing furnace 19. In addition, a traverser 65 is provided at the latter stage of the second curing furnace 21.
Is arranged. Each furnace 17, 19, 21 in this embodiment
Has three rows of transport paths 7 arranged in parallel. The transport path 7 is composed of a self-transporting roller conveyor 9 described later with reference to FIG. The number of parallel transport paths is not limited to three rows, and may be two rows or four rows or more. As will be described later, the larger the number of rows, the shorter the total length of the furnace. Each traverser moves on the rail 611 at the entrance or exit of each furnace so as to correspond to any of the three rows, and delivers the work 2 to and from the furnace.

A specific configuration example of the work 2 will be described with reference to FIG. The work 2 shown in FIG. 2A is the same as the work 2 shown in FIG.
After the coil 26 (FIG. 2C) is mounted on the cylindrical winding form 25 as shown in FIG. 3, the outside is covered with the face plate 1 (FIG. 2D). Resin is injected into the interior of the work 2 surrounded by the face plate 1. A plurality of connection terminals 261 are drawn out to the side from the coil 26, fitted into holes 262 formed in the face plate 1, and fixed. Face plate 1
Is the connection terminal 26 from the resin injection to the point before heat curing shrinkage.
It plays the role of fixing 1. Since the heat curing shrinkage starts in the second curing furnace 21, the face plate 1 is removed at the face plate disengaging portion 20 in the previous stage of the second curing furnace 21.

FIG. 18 shows an example of the structure of the pallet 4. This is a sheet metal structure intended to reduce the weight, and in order to supplement the strength, the outer periphery is bent and the rib portion 43 is provided. Ventilation holes (ventilation holes) 42 are provided in the bottom portion. With respect to the work 2 placed on the pallet 4, hot air from the lower side of the furnace passes through the ventilation holes 42 as described later with reference to FIG.
It becomes possible to pass through the cylindrical hollow portion of No. 5. This allows
Better heat transfer to the work 2 can be performed.

Next, the overall operation of the system of FIG. 1 will be described. For parts that are difficult to understand in this figure, refer to FIG. 13, which is a plan view of the system. However, in FIG.
Corresponds to the configuration excluding the face plate disengaging portion 20.
This configuration is adopted when a line for producing only a model that does not need to be fixed with the mold resin around the terminal portion or a fixing method that does not need to consider the displacement of the terminal position due to heat shrinkage.

The work 2 is placed and stocked on the pallet 4 placed on the stack conveyor 3. The work 2 is hoisted by the charging hoist 5 and placed on another pallet 4 which is previously placed on the traverser 61. The traverser 61 has a constant tact (constant time interval), and is cyclic (cyclic) so that the traverser 61 is introduced into the transfer passages 7 in the furnace having three rows.
That is, the rails 611 are sequentially shifted with respect to the conveyance paths of the third row, such as the first row, the second row, the third row, the first row, the second row, the third row ,. Shutter 8 on the furnace side
Opens accordingly and takes in the work 2 placed on the pallet 4. The workpieces 2 taken in are taken by the self-conveying roller conveyors 9 in the furnace every time 3 times the takt time, that is, every time 3 times the time interval in which one work 2 is taken in the furnace. Move to. In this way, the workpieces sequentially loaded into the respective rows are discharged from the outlet of the preliminary drying furnace 17 in order from the first loaded workpiece and also in the rotation.

The discharged work 2 is traverser 62.
It is thrown into the casting unit 63 via and the resin is injected therein. Since the commercially available equipment can be used for the casting unit 63, its internal structure will not be described in detail here. In the casting unit 18, the work 2 that has flowed on the roller conveyor of the traverser 62 and stopped before the casting unit 18 is taken into the casting unit 18 by the operation of a push button (not shown) by the operator. , After casting, eject again by pressing the push button. In the casting unit 18, the two liquids are automatically measured and mixed so that the mold resin can be injected at regular time intervals.

The work 2 discharged from the casting unit 18 is rotated through the traverser 63 into a three-row conveying path of the first curing furnace 19 in the same manner as when it is charged into the preliminary drying furnace 17. Here, the first curing process of the resin is performed.

The work 2 which is also discharged from the first curing furnace 19 in a wheel-turning manner is passed through the traverser 64 to remove the face plate 20.
The face plate 1 is manually removed here. The work 2 from which the face plate 1 has been removed is put into a wheel number by the traverser (hidden in the second curing furnace 21 in FIG. 1) to the three-row transport paths of the second curing furnace, as described above, The second hardening process is performed. Since this second curing process requires a longer time than the pre-drying process and the first curing process, the total length of the second curing furnace 21 is longer than that of the other furnaces.
From the outlet of the second curing furnace 21, the workpiece 2 that has undergone the curing treatment is discharged from the three outlets into a wheel number, and the traverser 65
It is moved to a predetermined position by the discharge hoist 22 via.

FIG. 14 shows a partially cutaway perspective view of a structural example of one conveying path in the preliminary drying furnace 17, and FIG. 15 shows a side view thereof. The same applies to the transfer paths in other furnaces.
The conveyance path 7 on the inner side of the shutter 8 has a plurality of pairs of stepped rollers 90 rotatably fixed to the support body 97 at regular intervals, and a roller chain 93 for rotating the stepped rollers 90 in an interlocking manner. The pawl chain 92 has pallet hooking pawls 91 attached at regular intervals corresponding to the size of the pallet, and a gear 98 that is fixed to a pair of shafts of the stepped roller 90 at the inlet end and rotates the pawl chain 92. . A roller driving rack 94 engages with a gear 99 fixed to the same shaft as the parent shaft 9 and
5 is driven. The parent-child cylinder 95 is
It is fixed outside the furnace and drives the rack 94 in two stages. The parent-child stroke of the parent-child cylinder (actuator) 94 corresponds to one pitch of the pallet storage in the furnace (interval of the pallet hooking claws 91). This is the pallet hook 91
Since it is difficult to supply a new pallet from the outside of the furnace when the pallet is moved by one pitch at a stroke, the pallet hooking pawl 91 is fed in two stages by the parent-child cylinder 95. Specifically, when the pallet pusher cylinder 96 tries to push the pallet into the furnace, the tip of the pallet contacts the pallet hooking 91 of the claw chain 92. In conjunction with this, the pawl chain 92 is rotated by the parent cylinder, and when most of one pitch is taken in, the child cylinder moves the remaining stroke of one pit, and the pawl 91 is hooked on the rear end of the pallet. A so-called one-way clutch is incorporated in the bearing portion of the gear 99 to rotate the chains 92 and 93 only in one rotation direction. The pull-out cylinder 100 is attached to a traverser (for example, 62) at the exit of the furnace, and normally descends, similar to the operation of the pallet pusher cylinder 96 described later, and after moving forward, ascending, hooking the pallet and retracting. Discharge the pallet out of the furnace. This is because the claw chain 92 alone cannot be completely discharged to the outside of the furnace.

In this specification, the position between the adjacent pallet hooking claws 91 where the pallet 4 should be placed is called a station.

A pallet pusher cylinder 96 is provided in the traverser in the preceding stage of the pre-drying furnace 17, and the pallet 4 is pushed out when the pallet 4 is loaded into the furnace. With reference to FIG. 16, a more specific operation example of loading the work 2 into the furnace will be described. In this embodiment, the pusher cylinder 96 is composed of two cylinders 163 and 164 whose strokes are orthogonal to each other.
The cylinder 163 can be lifted by abutting the side portion of 62. The cylinder 163 performs an operation of pushing out the pallet contact portion 165. Pallet pusher cylinder 96
Is normally lowered because the pallet passes over the traverser. After confirming the passage of the pallet with a sensor (not shown), the pallet rises.

When loading the pallet 4 into the pre-drying furnace 17, first, the operator places the pallet on the roller conveyor 162 of the traverser 61 in the preceding stage of the pre-drying furnace 17, and the work hoist 5 is used to work on the pallet. After hoisting and mounting 2, the insertion completion button 161 is pressed as shown in FIG. In response to this, the roller conveyor 162 of the traverser 61 rotates to automatically convey the pallet 4 to the furnace inlet. The worker performs this operation within a fixed time (tact time). When the system reaches the cycle of the certain time interval, the shutter 8 of the corresponding row is automatically opened, the pusher cylinder 96 is raised, the pallet contact portion 165 is pushed out, and the pallet 4 is pushed into the furnace together with the work 2. . At this time, as described above, the traverser 61
The roller conveyor 162 and the pallet hooking claw operate in synchronization with the pushing operation of the pusher cylinder 96.

In this way, when the workpieces are sequentially loaded into the three-row conveying paths of the preliminary drying furnace 1 in the wheel numbers, the internal workpieces are sequentially shifted to the wheel numbers and the furnace is filled with the workpieces. At this point, the first, second, and third workpieces have reached the discharge port in the furnace, and thereafter, discharge of the workpieces starts at regular intervals. At that time, the system recognizes from which row the work is discharged, and the traverser 62 automatically moves in accordance with the discharge row. Even after the furnace is filled with works, empty stations are created due to the work being discharged, so that the work can be continuously introduced.

The traversers, the transport paths in the furnaces, etc. are controlled in synchronization by a sequencer (not shown).

Next, FIG. 2 shows the internal structure of the furnace mainly related to heating. This structure is applicable to any of the preliminary drying oven 17, the first curing oven 19, and the second curing oven 21. The figure (a) is a side view, (b) is a BB 'arrow sectional view, (c) is an AA' arrow sectional view.

A shutter 8 whose opening / closing is controlled by a cylinder 80 is provided at the entrance / exit. The air curtain fan 10 blocks the outside air so that the warm air inside does not escape even when the shutter 8 is opened. To control the temperature in the furnace, a heater 11 (Fig. 2 (c)) is placed on the ceiling, and a fan 12 is also installed on the ceiling to blow air, and the left and right muffles 15 (Fig. 2 (b) (c)) are used. The hot air is guided to the lower side of the furnace, and the hot air is blown upward through the punching plate 13 installed on the lower side of the conveyor 9.

The temperature sensor 16 (see FIG. 2) is provided at the outlet.
(C)) is provided and the data is fed back to the temperature controller 14 to adjust the heat capacity of the heater 11 to control the temperature inside the furnace. When the furnace is divided into (a), (b), and (c), and each room has a temperature controller 14 and the furnace temperature is controlled in three stages, the partition of each room A shutter 8 similar to the doorway is installed in the middle of the furnace.

In this figure, a self-conveying roller conveyor 9 is used.
Is shown in one column for convenience, but is three columns in the embodiment shown in FIG.

As shown in FIG. 3, the temperature setting of each furnace of this embodiment is set in several steps in the same furnace. FIG.
The temperature set values of each furnace and the casting part and the temperature of the mold coil of this example are shown.

An overall view of the second embodiment of the present invention is shown in FIG.

In this embodiment, the in-furnace conveying path 7 shown in FIG. 1 is used.
This is an example in which one column is used as compared with the embodiment having three columns. The advantage of this embodiment is that (1) the traverser is not necessary, compared with the embodiment having three rows of conveying paths in FIG. 1, (2) when the door 23 for taking out the work is provided on the side surface of the furnace, Since there are only rows, there is no problem that it is difficult to take out the work in the central row. (3) Since there is only one row, only the warm air is blown from the side of the furnace to evenly hit the side of the work.

An overall view of the third embodiment of the present invention is shown in FIG.

In this embodiment, one pallet has the same number of 3
The size of the pallet 4 is enlarged so that the individual works 2 can be placed. In this case, the pallet 4 is conveyed with its longitudinal direction perpendicular to the conveying direction. Therefore, although there are three rows of works, since the conveying path itself in the furnace is one row, three works are simultaneously cured in the embodiment shown in FIG. 1 (having three rows of conveying paths 7 in the furnace). It has the advantage of being completed. In the case of a work that will work three at the same time in the next process,
This method is advantageous.

An overall view of the fourth embodiment of the present invention is shown in FIG.

The present embodiment is an embodiment in which the tact-up countermeasure in the embodiment shown in FIG. 1 is taken. When the work is in the furnace and the heating time cannot be shortened, that is,
To improve the takt time with a constant lead time,
It is necessary to increase the number of pallets in the furnace. FIG. 6 shows an example in which a transport path is added in parallel with the horizontal plane.

A fifth embodiment of the present invention is shown in FIG.

The present embodiment is an example in which the conveyance path is vertically extended to a two-story structure in order to improve the tact time when the lead time is constant. In the case of the present embodiment, the traverser 6 puts a work on it and moves left and right and up and down. The present embodiment has an advantage that the area occupied by the equipment is small.

FIG. 8 is an example showing an additional structure in the furnace. A shutter 8 is provided at the entrance and exit, and a goodwill-shaped heat insulating cloth 24 is provided along the shutter 8. This insulation cloth 24
Is to reduce temperature interference inside and outside the furnace when the shutter 8 is opened. In addition, (a), (b),
The goodwill heat insulating cloth 24 is also effective for the purpose of preventing the temperature interference between the three chambers as described in (c).

FIG. 9 shows another example of the structure inside the furnace.
The entrances and exits are provided with double-structured shutters 8a and 8b so that the presence of the rooms (a) and (c) prevents the outside air from affecting the room (b).

FIG. 10 shows another example of the heating structure in the furnace. This example is an example in which blowing from the side surface of the pineapple 15 is realized with respect to the AA ′ cross section of FIG. 2.
The self-conveying roller conveyor 9 has three rows.

FIG. 11 shows still another example of the furnace heating structure. In this example, the mounting position of the heater 11 is closer to the blowout port on the side surface of the pineapple 15 in the structure of FIG. Further, the structure shown in FIG. 12 is an example in which only the balloon on the side surface of the pineapple 15 is used.

[0046]

According to the present invention, the pulsation of production, which is a drawback of the conventional batch system, and the loss of electric heat energy due to the upper and lower temperatures due to the heat cycle pattern of the furnace temperature are eliminated.
Cast molding of the mold coil can be flowed at a fixed time interval for production, and production efficiency can be improved. At the same time, work in progress can be reduced by shifting from batch work to flow production.

Further, the heating cost can be reduced by devising the control of the temperature in the furnace.

The entire length of the furnace can be shortened by loading the workpieces into the conveying paths of a plurality of rows in the furnace by rotating wheels.

[Brief description of drawings]

FIG. 1 is an external view of the entire system of a first embodiment of a mold coil casting and curing furnace of the present invention.

2A and 2B are internal structural views of the first embodiment, in which FIG. 2A is an internal front view, FIG. 2B is a sectional view taken along the line BB ′, and FIG.
-A 'arrow cross section

FIG. 3 is a graph showing set temperatures and mold coil temperatures of the furnace of the first embodiment.

FIG. 4 is an external view of the entire system according to the second embodiment of the present invention.

FIG. 5 is an external view of an entire system according to a third embodiment of the present invention.

FIG. 6 is an external view of an entire system according to a fourth embodiment of the present invention.

FIG. 7 is an external view of an entire system according to a fifth embodiment of the present invention.

FIG. 8 is an explanatory diagram showing a modified example of the reactor internal structure in the first embodiment.

FIG. 9 is an explanatory diagram showing a modified example of the reactor internal structure in the first embodiment.

FIG. 10 is an explanatory view showing another modified example of the reactor internal structure in the first embodiment.

FIG. 11 is an explanatory view showing still another modified example of the reactor internal structure in the first embodiment.

FIG. 12 is an explanatory diagram showing another modification of the reactor internal structure according to the first embodiment.

FIG. 13 is a plan view of the first embodiment.

FIG. 14 is an explanatory diagram of a pallet transfer structure in a furnace according to the first embodiment.

FIG. 15 is a side view of the structure of FIG.

16 (a) and 16 (b) are explanatory views of taking in a pallet into the furnace in the first embodiment, and FIGS. 16 (a) and 16 (b) show a state with the passage of time.

17 is an explanatory diagram of a configuration of the work shown in FIG.

FIG. 18 is an explanatory view of a specific example of the pallet shown in FIG. 1, (a) is a perspective view, and (b), (c), and (d) are perspective views of disassembled parts.

[Explanation of symbols]

1 ... Face plate, 2 ... Mold coil, 3 ... Stack conveyor, 4 ... Pallet, 7 ... Conveying path in furnace, 8 ... Shutter,
9 ... Self-conveying roller conveyor, 11 ... Heater, 12 ... Fan, 13 ... Punching plate, 14 ... Temperature controller, 15 ... Mackle, 16 ... Temperature sensor, 17 ... Pre-drying oven, 18 ...
Casting section, 19 ... First curing furnace, 20 ... Face plate separating section, 21
... second curing furnace, 22 ... discharging hoist, 23 ... work taking-out door, 24 ... good heat insulating cloth, 61, 62, 63,
64, 65 ... Traverser

Claims (3)

[Claims] 1. A drying furnace for heating a work consisting of a mold and a coil for injecting the mold resin, a casting unit for injecting the mold resin into the work discharged from the drying furnace, and the casting unit. A first heating furnace for heating to cure the mold resin injected in step 2, and a second heating furnace for further curing the mold resin of the workpiece taken out of the first heating furnace and having the face plate removed. Each of the drying furnace, the first heating furnace, and the second heating furnace has a tunnel-shaped furnace structure, and the work is held in a unit of at least one predetermined number taken from the inlet for a predetermined time. At least one step at a time, which is successively advanced toward the exit by a pitch corresponding to at least the size of the work.
A mold coil casting and curing furnace, which is characterized in that it includes a line transport path. 2. In at least one of the drying furnace, the first heating furnace and the second heating furnace, there are provided a plurality of rows of transport paths that can be independently transported, and the plurality of rows of transport paths are provided. 2. The mold coil casting and curing furnace according to claim 1, wherein the predetermined number of works are put into the wheel number. 3. The drying furnace, at least one of the first heating furnace and the second heating furnace have at least two furnaces whose temperature is controlled at a constant temperature for each passage position inside thereof. The curing furnace for a mold coil according to claim 1 or 2.