JP3556739B2 - Roller hearth kiln drive coupling - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a connecting device for a ceramic roller and a metal rotary drive shaft in a roller hearth kiln, and more particularly to an improvement in a connecting means thereof.
[0002]
[Prior art]
A roller hearth kiln used as an industrial kiln has a large number of ceramic rollers provided along the conveying direction of the object to be fired, and fires while conveying the object by rotating these rollers. In this roller hearth kiln, the roller may warp or break due to the high temperature during use or the load of the object to be fired. In this case, it is necessary to replace the roller during operation. In addition, the glaze applied to the object to be fired adheres to the rollers, causing the object to be fired to meander or to run on the front base plate. . Further, in order to clean the rollers, the operation of the kiln must be temporarily stopped, and if the work of attaching and detaching the rollers is troublesome, the operation stop time of the kiln is prolonged, and the productivity is reduced.
[0003]
Conventionally, the driving device and the roller have been connected using, for example, a leaf spring (82) as shown in FIG. However, the hole in the brick at the penetration of the roller on the hearth wall of the roller hearth kiln is made small to reduce heat radiation from this hole. He was taking measures such as widening the holes in the bricks. In addition, even before the operation, when the high-temperature operation is performed, a misalignment between the rotation axis of the roller and the rotation axis of the rotation drive shaft occurs due to a difference in thermal expansion of components such as the roller, and sometimes a ceramic roller is damaged. Had also occurred.
[0004]
[Problems to be solved by the invention]
Provided is a coupling device capable of transmitting rotational drive even when a roller and a rotational drive shaft of a drive device are eccentric.
[0005]
[Means for Solving the Problems]
The drive connection device of the roller hearth kiln of the present invention has been made in order to solve such problems, and the gist of the invention is that a number of ceramic rollers are provided along the conveying direction of the object to be fired. A rotating shaft of a roller hearth kiln for firing while conveying the object to be fired by rotating these rollers, and a ceramic roller, wherein the rotary driving shaft is inserted and connected to form a hollow pipe. A holder, a roller cap fixed to a ceramic roller , and a connection shaft that is fitted and connected to the holder and the roller cap, and is coupled to transmit the rotation of a rotary drive shaft to the roller. It is characterized in that at least the insertion state between the roller cap and the connection shaft is loose insertion.
[0006]
Preferred embodiments of the present invention include the following.
In the vicinity of the end of the holder on the side of the rotation drive shaft, two first locking holes are provided on the holder at positions perpendicular to the axis of the holder and substantially symmetric with respect to the axis, In the vicinity of the end of the holder of the rotary drive shaft, a first locking tool for loosely inserting into the two first locking holes and connecting the rotary drive shaft and the holder is provided,
Providing two second locking holes on the holder in the vicinity of the end of the holder on the connection shaft side, at positions perpendicular to the axis of the holder and substantially symmetric with respect to the axis, Each of the two second locking holes is loosely inserted near the end of the holder of the shaft.
And a second locking member for connecting the holder and the connecting shaft is provided,
Two third locking holes are provided on the roller cap in the vicinity of the end of the roller cap on the connection shaft side, at positions perpendicular to the axis of the roller cap and substantially symmetric with respect to the axis. , the end portion of the roller cap of the connecting shaft, and loosely inserted respectively into the two third of the connecting locking hole, formed by providing a third of the connecting fastener for coupling the connecting shaft and the roller cap Roller hearth kiln drive coupling device.
The directions of the first, second, and third fasteners are out of phase with each other. Notches formed from ends of the holder and the roller cap to the first, second and third locking holes are formed. The fastener is an insertion pin. The insertion pin is stopped by a C-shaped snap ring for shaft provided at the end of the holder and the roller cap.
[0007]
Here, the term “insertion” literally means insertion. For example, it refers to inserting a rotary drive shaft into a holder. The loose fit refers to fitting in a state where there is a movable gap between the fitted and the fitted. In addition, the loose insertion means that what is being inserted is inserted in a state where there is room in space. The out-of-phase relationship means that the directions of the first, second, and third fasteners are different with respect to the cross section of the connecting portion.
[0008]
[Action]
According to the drive connection device of the present invention, a hollow holder, a connection shaft, and a roller cap are arranged between the rotation drive shaft and the roller. By inserting one end of the connection shaft at one end, and further inserting the connection shaft at one end of the roller cap, by providing at least clearance between parts at the connection point between the roller cap and the connection shaft, the rotation drive shaft The degree of freedom for displacement between the rotation center and the rotation center of the roller can be increased. Therefore, even if the rotation center of the rotation drive shaft and the rotation center of the roller are misaligned, the rotation drive is reliably transmitted. The size of the clearance may be determined in consideration of the accuracy of the driving shaft, the length of the roller, the accuracy of the rotating shaft of the roller, the deviation due to the thermal expansion of the roller support during operation, the hole position accuracy of the wall, and the like. .
[0009]
When the rotary drive shaft is directly connected to the roller cap without providing a hollow holder and a connection shaft, even if the connection state is loose fit, adjustment to accurately match the rotary drive shaft with the rotation center of the roller Is required. When a displacement between the rotation center of the rotary drive shaft and the rotation center of the roller occurs, the roller tries to move so as to reduce the displacement between the rotation center of the fixed rotary drive shaft and an excessive load is applied. Would. As a result, the object to be fired on the roller is meandering, causing the object to be fired to fall over or to be displaced, so that good conveyance cannot be performed. Further, the roller may be damaged by excessive force.
Even if the center of rotation is accurately matched when the roller hearth kiln is stopped, the temperature of the roller and the connecting device may rise during operation, resulting in displacement of the center of rotation. Furthermore, when the weight of the object to be fired carried on the rollers is heavy, the rollers may bend and the rotational center may be displaced.
By disposing the holder and the connection shaft between the rotary drive shaft and the roller, it is possible to absorb the displacement between the rotation center of the rotary drive shaft and the rotation center of the roller, thereby imposing an unreasonable load on the ceramic roller. Stable operation is possible without applying.
[0010]
It is preferable to provide a locking hole in the holder and the roller cap, and to lock the respective connecting members (the rotation drive shaft, the holder, the connecting shaft, and the roller cap) with a locking tool because it can be manufactured at the lowest cost.
A locking tool provided perpendicularly and coaxially to the rotary drive shaft and the connection shaft through the first, second and third locking holes is separately formed on both sides of the rotary drive shaft and the connection shaft. Even if you attach the pin with screws, etc., even if you drill a through hole in the rotation drive shaft and the connection shaft and fix the integrated pin that passes through it with a set screw, you can also simply use bolts and nuts etc. It can also be fixed.
Further, it is necessary that the fastener provided perpendicularly and coaxially to the drive shaft and the connection shaft is in a state of protruding from the outer surfaces of the holder and the roller cap to be inserted, and has a protruding length. Must be larger than the clearance generated between the holder and roller cap and the drive shaft and the connection shaft when the shaft is in the loosely fitted state.
[0011]
Further, although the directions of the first, second and third fasteners do not necessarily have to be orthogonal to each other, the phase shift may be caused by the strength of the material of the holder and the roller cap and the work of replacing the roller. It is desirable because of the time procedure.
Further, it is possible to increase the degree of freedom for three-dimensional by a Cartesian relationship.
[0012]
It is preferable to provide notches that reach the respective locking holes from the ends of the holder and the roller cap, in order to facilitate the insertion and fitting, and to easily and quickly attach and detach the locking members and quickly perform positioning. These cut portions may be provided on only one side of each of the locking holes of the holder and the roller cap, but are preferably provided on both sides. Further, the notch does not necessarily have to be the same as the size of each locking hole, and the width may be appropriately set as long as each locking tool can be removed from the ends of the holder and the roller cap through the notch.
[0013]
It said first and when the second and third providing the switching interrupt unit is reached to the tethering hole Install a pin fabricated separately from both sides to the drive shaft and the connecting shaft with screwed or driven shaft And a through hole in the connection shaft, and an integral pin penetrating therethrough is fixed using a set screw, and furthermore, a C-shaped snap ring for shaft provided on the end side from the holder and the fixing member of the roller cap. It is preferable to stop. Further, it is preferable that the position of the C-shaped retaining ring for the shaft is fixed by a retaining groove provided on an end side from each of the locking holes.
It is preferable to form a through-hole and use an integrated pin that penetrates the through-hole because the workability of assembling is better as compared with a case where a separately manufactured pin is attached by screwing.
[0014]
In addition, by integrating each locking hole and the cut portion, the degree of freedom that the locking tool can move in the length direction of the roller is increased, and even if the roller or the like changes from a normal temperature to a high temperature, it is thermally expanded. The influence of expansion and contraction can be avoided.
[0015]
Furthermore, by stopping with a C-shaped snap ring for shaft provided on the end side from the fastener of the holder and the roller cap, the fastener in each of the locking holes is prevented from falling off when the roller is broken and from the furnace. It is effective when withdrawing. Further, a stopper groove is provided on the end side from each of the locking holes, and the C-shaped retaining ring for the shaft is stopped at this position, whereby the shaft can be securely fixed.
Also, if the roller breaks during the operation of the roller hearth kiln and the roller is replaced, if the bolt and nut is used as a fastener, the bolt and nut are rotating and cannot be removed. When fixed by screws or screws and connected by a C-shaped retaining ring for the shaft, the C-shaped retaining ring for the shaft slides in the groove, so that the roller can be easily removed even if it rotates.
[0016]
【Example】
(Example 1)
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIG. 2, a number of hollow rollers made of ceramics (9) are juxtaposed at the upper and lower intermediate positions of the wall of the roller hearth kiln (45), and the object to be fired (not shown) is rotated by the rotation of the rollers (9). It is baked while being conveyed in the furnace. One end (9a) of these rollers (9) is connected to a rotary drive (49) via a roller cap (7), a connecting shaft (5) and a holder (1), while the other end (9b) is It is supported by a support device (51).
The rotary drive (49) has a rotary drive shaft (3) rotatably supported by a support frame (53) via a bearing (55). The rotary drive shaft (3) is connected to a drive motor via a sprocket (57) fixed to an intermediate portion of the shaft and a chain wound around the sprocket (57), and the driving force from the drive motor is transferred to the holder (1) and the connection shaft. (5), and transmitted to one end (9a) of the roller (9) via the roller cap (7).
On the other hand, the other end (9b) of the roller (9) is rotatably supported by a receiving roller which is rotatably mounted via a bearing to a fixed shaft fixed to a bracket fixed to a wall body. ing.
[0017]
FIG. 1 shows a main part of the connecting device shown in FIG. FIG. 3 shows each part constituting the main part of the connecting device of FIG. The description will be made with reference to FIGS. 1, 2 and 3.
(Connection between rotary drive shaft and holder)
As shown in FIG. 3 (D), the holder (1) is formed with first locking holes (27a, 27b) and a first notch (19) reaching the first locking holes (27a, 27b) . A rotary drive shaft (3) shown in FIG. 3 (A) is loosely fitted to one end of the holder (1), and its specific configuration is as follows. First, a first insertion pin (11) is inserted into a through hole (71) at an end of the rotary drive shaft (3) by projecting both ends thereof, and is separately formed from both sides of the rotary drive shaft (3). The first insertion pin (11) is fixed to the rotary drive shaft (3) by screwing the set screw (69). The first drive pin (11) is connected to the first notch (19) of the holder (1) from the first notch (19) by the first connection between the rotary drive shaft (3) to which the first drive pin (11) is fixed. It is inserted until it reaches the stop holes (27a, 27b), and a C-shaped retaining ring (41) for the shaft is attached to the first groove (63) formed in the holder (1) to prevent falling off. Thereby, the holder (1) and the rotary drive shaft (3) are connected with the first insertion pin (11) passing through the first locking holes (27a, 27b) of the holder (1) as a locking tool. .
(Connection between holder and connecting shaft)
The holder (1) shown in FIG. 3 (D), further second Tsunagitomeana (29) and a second cut portions extending thereto (21) is formed, the holder according to the same procedure as described above ( 1) The connecting shaft (5) shown in FIG. 3 (B) is loosely fitted into the through hole (72) at the other end, and the holder (1) and the connecting shaft (5) are connected to each other as shown in FIG. The connecting shaft (5) and the second inserting pin (13) are fixed by using a set screw (69), and the holder (1) is fixed. The C-shaped retaining ring (41) for the shaft was attached to the second groove (65) formed in (2).
(Connection between connecting shaft and roller cap)
A third locking hole (31) and a third notch (23) leading to the third locking hole (31) are formed in the roller cap (7) shown in FIG. 3 (C), and as shown in FIG. One end (9a) of the roller (9) is inserted into 7), and is connected by a bolt. The connecting shaft (5) is loosely fitted to the other end of the roller cap (7), and the roller cap (7) and the connecting shaft (5 ) are inserted into the through hole (73) in the same procedure as described above. and the third insertion pin (15) coupled by penetrating a locking device, by using a set screw (70), the connecting shaft (5) and the third bayonet (15) and secure the A C-shaped retaining ring (42) was attached to the third groove (67) formed in the roller cap (7).
[0018]
Here, the diameter of the rotary drive shaft (3) was 15 mm, the diameter of the connecting shaft (5) was 15 mm, the inner diameter of the holder (1) was 15.5 mm, and the inner diameter of the roller cap (7) was 28 mm. Therefore, the clearance between the rotary drive shaft (3) and the holder (1) is 0.5 mm, the clearance between the connecting shaft (5) and the holder (1) is 0.5 mm, and the connecting shaft (5) and the roller cap (7). Is 13 mm.
As shown in FIG. 5, even if there was a deviation of 7 mm between the rotation axis of the drive shaft and the rotation axis of the roller, transmission of the rotation drive could be performed without any problem.
[0019]
【The invention's effect】
As is clear from the above description, by using the drive coupling device obtained by the present invention, a problem caused by a deviation between the rotation axis of the drive shaft and the rotation axis of the roller does not occur. Therefore, it is possible to ease the accuracy of the mounting position of the drive unit, and it is not necessary to enlarge the hole of the perforated brick forming the wall and readjust the drive unit, and it is extremely easy to assemble the drive unit of the roller hearth kiln and its periphery. Has the following advantages.
In addition, when the roller hearth kiln is operated at a high temperature, it is advantageous against a displacement caused by a difference in thermal expansion between components such as a roller.
[Brief description of the drawings]
FIG. 1 is an upper half sectional view and a lower half side view showing a roller connecting device according to a first embodiment of the present invention .
FIG. 2 is a cross-sectional view of a roller hearth kiln with a roller attached.
[3] Parts side view of a main portion of the roller coupling device of the present onset Ming embodiment. (A) rotary drive shaft, (B) connecting shaft, (C) roller cap (side view seen from two orthogonal directions), (D) holder (side view seen from two orthogonal directions)
FIG. 4 is a sectional view of a main part of a conventional roller connecting device.
FIG. 5 is an explanatory diagram of a state of misalignment between a rotary drive shaft and a roller according to the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Holder 3 Rotation drive shaft 5 Connecting shaft 7 Roller cap 9 Roller 11 First insertion pin 13 Second insertion pin 15 Third insertion pin 19 First cut section 21 Second cut section 23 Third Notch 27 First locking hole 29 Second locking hole 31 Third locking hole 41 C-shaped retaining ring for shaft 42 C-shaped retaining ring for shaft 45 Roller hearth kiln 49 Rotary drive device 51 Support device 53 Support frame 55 Bearing 57 Sprocket 63 First groove 65 Second groove 67 Third groove 69 Set screw 70 Set screw 71 Through hole 72 Through hole 73 Through hole 80 Connecting pipe 82 Leaf spring 83 Pin 84 Wall

Claims (6)

A number of ceramic rollers are provided along the direction of conveyance of the object to be fired, and the rotation of these rollers connects the rotary drive shaft of the roller hearth kiln, which fires while conveying the object to be fired, and the ceramic rollers. A hollow pipe-shaped holder for inserting and connecting a rotary drive shaft, a roller cap fixed to a ceramic roller, and a rotary drive shaft inserted and connected to the holder and the roller cap. A connection shaft for transmitting the rotation of the roller shaft to the roller , wherein at least one of the respective insertions is loosely inserted between the roller cap and the connection shaft. . In the vicinity of the end of the holder on the side of the rotation drive shaft, two first locking holes are provided on the holder at positions perpendicular to the axis of the holder and substantially symmetric with respect to the axis, In the vicinity of the end of the holder of the rotary drive shaft, a first locking tool for loosely inserting into the two first locking holes and connecting the rotary drive shaft and the holder is provided,
Providing two second locking holes on the holder in the vicinity of the end of the holder on the connection shaft side, at positions perpendicular to the axis of the holder and substantially symmetric with respect to the axis, In the vicinity of the end of the holder of the shaft, a second locking member is provided, which is loosely inserted into each of the two second locking holes to couple the holder and the connecting shaft .
Two third locking holes are provided on the roller cap in the vicinity of the end of the roller cap on the connection shaft side, at positions perpendicular to the axis of the roller cap and substantially symmetric with respect to the axis. , the end portion of the roller cap of the connecting shaft, and loosely inserted respectively into the two third of the connecting locking hole, formed by providing a third of the connecting fastener for coupling the connecting shaft and the roller cap The drive connection device of a roller hearth kiln according to claim 1 . The drive connection device of a roller hearth kiln according to claim 2 , wherein directions of the first, second, and third fasteners are out of phase with each other. The drive connection device for a roller hearth kiln according to claim 2 or 3 , wherein a cut portion is formed from the end portions of the holder and the roller cap to reach the first, second, and third locking holes. The drive connection device for a roller hearth kiln according to any one of claims 2 to 4 , wherein the locking member is an insertion pin. The drive connection device for a roller hearth kiln according to claim 5 , wherein the insertion pin is stopped by a C-shaped retaining ring for a shaft provided at ends of the holder and the roller cap.

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