JP2017057084A - Belt elongation detecting device and burning furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable reduction of frequency of belt maintenance and reduction of facility costs.SOLUTION: A belt elongation detecting device 5 comprises: driven rollers 21 to 23; tension rollers 24 and 25; a penetration type sensor 27; and a display 43. The driven rollers 21 to 23 come in contact with a mesh belt 2, from a lower side of the mesh belt 2 which moves so as to be circulated through a loop passage. The tension rollers 24 and 25 are arranged among the driven rollers 21 to 23 and come in press contact with the mesh belt 2 from an upper side of the mesh belt 2. The tension rollers 24 and 25 are configured so as to be freely movable in a specified vertical movement range. The penetration type sensor 27 detects descent to a warning position or lower and outputs warning signals. The display displays a warning message on the basis of the warning signals outputted from the penetration type sensor 27.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a belt elongation detection apparatus and a firing furnace that detect that the elongation of a belt that moves along a loop-shaped path and conveys a workpiece exceeds a predetermined amount.

  A heat treatment apparatus that heats a workpiece in a heat treatment furnace includes a belt such as a mesh belt that circulates and moves through a loop path. This loop path includes a work conveyance range from the supply position outside the heat treatment furnace to the delivery position outside the heat treatment furnace via the inside of the heat treatment furnace. The workpiece is placed on the belt at the supply position, and the workpiece is collected from the belt at the delivery position.

  As such a heat treatment apparatus, for example, there is an apparatus in which a workpiece conveyance range extends to a length of about 10 m to 20 m like a continuous firing furnace. The belt continuously moves along a loop path including a relatively long workpiece conveyance range, and is heated together with the workpiece in the heat treatment furnace. Further, the belt is stretched between the driving roller and the driven roller, and moves in a state where a tension is applied.

  For this reason, the belt tends to be stretched in the moving direction. Elongation in the moving direction of the belt causes damage to the belt. If the belt is left damaged, the workpiece cannot be conveyed properly. Therefore, maintenance such as truncation of the belt and replacement of the belt itself needs to be performed at an appropriate timing, but frequent maintenance is complicated.

  In view of this, there has been proposed a belt stretch detection device that includes a pit in which a hanging portion of the belt is housed and detects that the belt has dropped beyond a predetermined amount in the pit (see, for example, Patent Document 1).

JP 2007-131396 A

  However, in the conventional belt stretch detection device, construction for providing pits is required. For this reason, there exists a possibility that equipment cost may rise.

  An object of the present invention is to provide a belt elongation detecting device and a firing furnace that can reduce the frequency of maintenance of the belt and reduce the equipment cost.

  The belt stretch detection device of the present invention includes a plurality of driven rollers, one or more tension rollers, a detection unit, and a notification unit. The driven roller is in contact with the belt that circulates through the loop path from below. The driven roller is restricted from moving in a direction along a plane orthogonal to the axial direction of the driven roller. The tension roller is disposed between the driven rollers, presses against the belt from above, is configured to be movable within a predetermined movement range in the vertical direction, and descends by its own weight as the belt extends. The detection unit is disposed within the movement range of the tension roller in the vertical direction, detects that the tension roller has dropped below a predetermined warning position in the movement range in the vertical direction, and outputs a detection signal. An alerting | reporting part alert | reports a warning based on the detection signal output from a detection part.

  In this configuration, the tension roller descends as the belt extends. The belt tension is maintained constant by the belt being pressed downward by the descending tension roller between the adjacent driven rollers. For this reason, until all the tension rollers reach the lowermost end in the moving range, problems such as belt damage and work conveyance failure do not occur even if maintenance is not performed. Moreover, it is not necessary to perform construction for providing a pit. Furthermore, the warning can be notified at a predetermined timing before the tension roller reaches the lowermost end in the moving range, so that the belt can be maintained at an appropriate timing.

  In the above configuration, the tension roller is preferably configured to be movable to a position below the warning position. According to this configuration, since the tension roller can be lowered even after the warning is notified, the belt tension can be maintained. For this reason, a time margin can be provided so that the tension of the belt can be maintained during the period from when the warning is notified until the treatment according to the warning is actually performed.

  The alarm unit further includes a sensor that detects that the tension roller has fallen below a predetermined notice position that is a notice position within the movement range of the tension roller and is above the warning position, and outputs a notice signal. It is preferable to be configured to display a notice message based on a notice signal output from the sensor.

  Also, a plurality of tension rollers can be provided. By adding a tension roller disposed between the driven rollers, it becomes possible to cope with the elongation of the desired length of the belt. For this reason, compared with the case where the construction which provides a pit is performed, the extension length of the belt which can be coped with can be increased simply and at low equipment cost.

  Furthermore, it is preferable to further include a fixing mechanism that can fix and release the tension roller at each of an upper fixing position and a lower fixing position below the upper fixing position within the moving range.

  In this configuration, in the initial stage, all tension rollers are arranged at the upper fixing position, one of the tension rollers is released from the fixing position, and the other tension roller is fixed at the upper fixing position. The tension roller that has been unlocked is lowered as the belt stretches, so that the belt tension is maintained constant. When the tension roller that has been unlocked is lowered below the warning position, a warning is notified, so that it is recognized that the timing for performing the predetermined intermediate work is given to the operator, and the lowered tension roller is used as the intermediate work. While being fixed at the lower fixing position, one of the fixed tension rollers is released. In this way, when one tension roller in the upper fixing position is released from the fixing state, and lowered and fixed to the lower fixing position as the belt extends, the next one tension roller in the upper fixing position is Unfixing is repeated sequentially. As a result, a plurality of tension rollers move down one by one from the upper fixed position to the lower fixed position as the belt grows, and the belt is cut down or the belt itself is replaced until all tension rollers reach the lower fixed position. There is no need to perform such maintenance.

  The fixing mechanism includes a tension roller rotation shaft having a pin hole in a direction perpendicular to the tension roller rotation axis direction, and an upper fixing hole and a lower fixing position through which the pin inserted into the pin hole can be inserted at the upper fixing position. And a fixing member having a lower fixing hole through which the pin inserted through the pin hole can be inserted.

  In this configuration, the tension roller is fixed at the upper fixing position by inserting the pin through the pin hole and the upper fixing hole at the upper fixing position, and the fixing is released by removing the pin. Similarly, the tension roller is fixed at the lower fixing position by inserting a pin through the pin hole and the lower fixing hole at the lower fixing position. Thus, the tension roller can be fixed and released with a simple structure.

  According to this invention, the maintenance frequency of the belt can be reduced and the equipment cost can be reduced.

It is a front view which shows the schematic structure of the continuous baking furnace which is an example of the heat processing apparatus provided with the belt elongation detection apparatus which concerns on embodiment of this invention. It is the front view to which the belt elongation detection apparatus was expanded. It is side surface sectional drawing of the tension roller contained in a belt elongation detection apparatus. It is a block diagram which shows the schematic electrical structure of a continuous baking furnace. (A)-(C) are the figures explaining operation | movement of a belt elongation detection apparatus.

  As shown in FIG. 1, a continuous firing furnace 10 having a belt stretch detection device 5 according to an embodiment of the present invention includes a heat treatment chamber 1, a mesh belt 2, a driving stretch roller 3, a driven stretch roller 4, and a belt. An elongation detection device 5 is provided.

  The heat treatment chamber 1 is a heat treatment furnace, and performs a predetermined heat treatment on the workpiece. The mesh belt 2 conveys a work placed on the upper surface. The mesh belt 2 is stretched around a drive tension roller 3, a driven tension roller 4, and a belt stretch detection device 5. The mesh belt 2 moves so as to circulate in a loop-shaped path including a workpiece conveyance range from the supply position 6 through the heat treatment chamber 1 to the delivery position 7.

  The supply position 6 is disposed outside the heat treatment chamber 1 on the inlet 1A side. At the supply position 6, the work is placed on the upper surface of the mesh belt 2. The delivery position 7 is disposed outside the heat treatment chamber 1 on the outlet 1B side. At the delivery position 7, the workpiece is collected from the upper surface of the mesh belt 2.

  The drive tension roller 3 is disposed outside the heat treatment chamber 1 on the outlet 1B side. The drive tension roller 3 is supplied with a rotational force from the motor 42 and rotates. When the drive tension roller 3 rotates, the mesh belt 2 moves along a loop-shaped path in a state where tension is applied to the mesh belt 2.

  The driven tension roller 4 is disposed outside the heat treatment chamber 1 on the inlet 1A side.

  In this embodiment, the belt elongation detecting device 5 is arranged outside the inlet 1A side of the heat treatment chamber 1 and upstream of the driven tension roller 4 in the moving direction of the mesh belt 2. It is not limited.

  As shown in FIGS. 2 and 3, the belt stretch detection device 5 includes a plurality of driven rollers 21, 22, 23, tension rollers 24, 25, transmission sensors 26, 27, and a display 43 (see FIG. 4). I have. In this embodiment, the belt stretch detection device 5 includes three driven rollers 21, 22 and 23 and two tension rollers 24 and 25.

  The driven rollers 21 to 23 are arranged in parallel along the moving direction of the mesh belt 2 so as to contact the mesh belt 2 from below. Both ends of the rotating shafts of the driven rollers 21 to 23 are fixed to the apparatus frame 31 of the continuous baking furnace 10, thereby restricting movement in the direction along the plane perpendicular to the axial direction of the driven rollers 21 to 23. Yes. The roller portions of the driven rollers 21 to 23 are configured to be rotatable with respect to the rotation shaft. The roller portions of the driven rollers 21 to 23 rotate as the mesh belt 2 moves.

  The tension rollers 24 and 25 are disposed between the driven rollers 21 to 23 adjacent to each other, and are disposed so as to be in pressure contact with the mesh belt 2 from above. Hereinafter, the tension roller 24 will be mainly described, but the tension roller 25 is configured in substantially the same manner as the tension roller 24.

  The tension roller 24 has a roller portion 241 and a rotation shaft 242. A guide portion 32 having a predetermined length in the vertical direction is provided on each of the device frames 31 before and after the continuous firing furnace 10. Both end portions of the rotating shaft 242 are supported by the guide portions 32 of the front and rear device frames 31 so as to be movable in the vertical direction within a predetermined movement range and non-rotatable.

  The tension roller 24 descends due to its own weight as the mesh belt 2 extends. The tension of the mesh belt 2 is maintained by the mesh belt 2 being pressed downward by the descending tension roller 24 between the driven rollers 21 and 22 adjacent to each other.

  The rotating shaft 242 has pin holes 243 in the vicinity of both ends in the direction orthogonal to the rotating shaft direction of the tension roller 24, that is, the longitudinal direction of the rotating shaft 242. Since the rotation shaft 242 cannot rotate, the pin hole 243 is maintained in a certain direction.

  The roller portion 241 is extrapolated on the rotating shaft 242 with the bearing 244 interposed therebetween, and is configured to be rotatable with respect to the rotating shaft 242. The roller unit 241 rotates as the mesh belt 2 moves.

  On both sides of the pin hole 243 in the rotation axis direction, collar members 245 and 246 are fitted into the rotation shaft 242 at a predetermined interval. In addition, the weight of the tension roller 24 can be adjusted by mounting the weight 248 between the collar member 246 on the end side in the rotation axis direction and the collar member 247 on the outer side. Thereby, the tension of the mesh belt 2 can be adjusted.

  The belt extension detection device 5 is configured to be able to fix and release the tension roller 24 at an upper fixing position and a lower fixing position below the upper fixing position within the moving range.

  The apparatus frame 31 has an upper fixing hole 29 at a predetermined upper position and a lower fixing hole 30 at a predetermined lower position within the moving range of the tension roller 24.

  By inserting the pin 28 through the pin hole 243 and the upper fixing hole 29 at the upper fixing position, the tension roller 24 is fixed at the upper fixing position, and the pin 28 is fixed by being removed from the pin hole 243 and the upper fixing hole 29. Canceled. Similarly, by inserting the pin 28 through the pin hole 243 and the lower fixing hole 30 at the lower fixing position, the tension roller 24 is fixed at the lower fixing position, and the pin 28 is removed from the pin hole 243 and the lower fixing hole 30. It will be unlocked. Thus, the tension roller 24 can be fixed and released with a simple structure.

  The device frame 31 has an upper fixing hole 29 through which the pin 28 inserted through the pin hole 243 can be inserted at the upper fixing position and a lower fixing hole 30 through which the pin 28 inserted through the pin hole 243 can be inserted at the lower fixing position. The fixing member which has is comprised.

  The rotation shaft 242 of the tension roller 24, the device frame 31, and the pin 28 are included in a fixing mechanism that can fix and release the tension roller 24 at the upper fixing position and the lower fixing position, respectively.

  The transmissive sensor 27 detects that the tension roller 24 has fallen below a predetermined warning position in the movement range in the vertical direction, and outputs a detection signal.

  The transmissive sensor 26 is arranged slightly above the transmissive sensor 27. When the tension roller 24 is lowered, the transmissive sensor 26 detects the tension roller 24 before the transmissive sensor 27 outputs a warning signal, and notifies the operator of the tension roller 24. A warning signal is output to notify that is approaching the warning position.

  As an example, the transmissive sensors 26 and 27 are set to output a detection signal by detecting the rotation shaft 242 of the tension roller 24.

  The warning position is preferably set to a position where the tension roller 24 can be further lowered. As a result, the tension of the mesh belt 2 is maintained by applying the weight of the tension roller 24 to the mesh belt 2 even after the warning is notified and before the work according to the warning by the operator is performed. .

  As shown in FIG. 4, the continuous firing furnace 10 further includes a control unit 41, a motor 42, and a display 43.

  The control unit 41 comprehensively controls each input / output device of the continuous firing furnace 10. The motor 42 supplies a rotational force to the drive tension roller 3.

  The transmission type sensor 26 is arranged so as to detect that the rotation shaft 242 of the tension roller 24 has fallen below a predetermined notification position within the movement range, and outputs a notification signal when the rotation shaft 242 is detected. The same applies to the tension roller 25.

  The transmission type sensor 27 is arranged to detect that the rotary shaft 242 of the tension roller 24 is lowered below a predetermined warning position within the movement range, and outputs a warning signal when the rotary shaft 242 is detected. The same applies to the tension roller 25.

  When the notice signal is input, the display 43 displays a notice message indicating that the tension roller 24 has been lowered below the notice position. Further, when the warning signal is inputted, the display device 43 displays a warning message that the tension roller 24 is lowered below the warning position. The operator can recognize that the tension roller 24 is approaching the warning position by displaying the notice message, and by displaying the warning message, the operator can move the tension roller 24 to the lowest end in the moving range. You can recognize that you are approaching.

  The transmissive sensor 27 is an example of a detection unit. Instead of the transmission type sensors 26 and 27, a reflection type sensor or other known detection sensors may be used.

  The display device 43 is an example of a notification unit that notifies a notice and a warning based on detection signals output from the transmission sensors 26 and 27. As a notification part, it can replace with the indicator 43 or can also be provided with the speaker which generate | occur | produces notification sounds, such as a buzzer sound, with the indicator 43. FIG.

  As shown in FIG. 5A, in the initial stage after the previous maintenance of the mesh belt 2 such as truncation of the mesh belt 2 or replacement of the mesh belt 2 itself, all the tension rollers 24 and 25 are in the upper fixed position. Be placed.

  When the continuous firing furnace 10 is driven, one of the tension rollers 24 and 25 is released from the fixing state, and the other tension roller 25 is left fixed at the upper fixing position.

  The tension roller 24 that has been unlocked is lowered by its own weight as the mesh belt 2 extends, so that the tension of the mesh belt 2 is maintained.

  As shown in FIG. 5B, when the tension roller 24 that has been unlocked is lowered below the warning position, a warning message is displayed on the display device 43, so that the operator should perform a predetermined intermediate work at a timing. It is recognized that

  As shown in FIG. 5C, as an intermediate operation, the lowered tension roller 24 is fixed to the lower fixing position, and one of the tension rollers fixed to the upper fixing position is released. The In this embodiment, since only one tension roller 25 is fixed at the upper fixing position at this stage, the tension roller 25 is released.

  In this way, when one tension roller 24 in the upper fixing position is released from the fixing state and lowered with the mesh belt 2 being extended and fixed in the lower fixing position, the next one in the upper fixing position is obtained. The fact that the tension roller 25 is released from the fixed state is sequentially repeated when there are three or more tension rollers. As a result, a plurality of tension rollers 24 and 25 are sequentially lowered one by one from the upper fixing position to the lower fixing position as the mesh belt 2 extends, until all the tension rollers 24 and 25 reach the lower fixing position. There is no need to perform maintenance such as truncation of the mesh belt 2 or replacement of the mesh belt 2 itself. Moreover, it is not necessary to perform construction for providing a pit.

  When the transmission type sensor 27 detects that all the tension rollers 24 and 25 are lowered below the warning position, the drive tension roller 3 can be stopped by stopping the motor 42. Thereby, the conveyance by the mesh belt 2 in a state where the tension of the mesh belt 2 is not maintained constant can be automatically stopped in advance.

  According to the belt elongation detection device 5, the maintenance frequency of the mesh belt 2 can be reduced and the equipment cost can be reduced.

  Further, by providing a plurality of tension rollers, it is possible to cope with the elongation of the desired length of the mesh belt 2. For this reason, compared with the case where the construction | work which provides a pit is performed, it can respond also to the increase in elongation of the mesh belt 2 by simple and low installation cost. Therefore, the maintenance frequency of the mesh belt 2 can be further reduced.

  The above description of the embodiment is to be considered in all respects as illustrative and not restrictive. The scope of the present invention is shown not by the above embodiments but by the claims. Furthermore, the scope of the present invention is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

2 Mesh belt (belt)
5,5A Belt elongation detection device 10 Continuous firing furnace (heat treatment device)
21, 22, 23 Driven roller 24, 25 Tension roller 243 Pin hole 26, 27 Transmission type sensor (detection unit)
28 pin 29 upper fixing hole 30 lower fixing hole 31 apparatus frame 32 guide part 41 control part 43 indicator (notification part)
50 Cylinder device 51 Cylinder member 52 Cylinder drive

Claims (8)

A plurality of driven rollers that are in contact with a belt that circulates in a loop-shaped path from below and that are restricted from moving in a direction along a plane perpendicular to the axial direction of the driven rollers;
One or more tension rollers arranged between the driven rollers, pressed against the belt from above, configured to be movable within a predetermined movement range in the vertical direction, and lowered by its own weight as the belt extends; ,
A detection unit that is disposed within the movement range of the tension roller in the vertical direction, and that detects that the tension roller has dropped below a predetermined warning position within the movement range in the vertical direction and outputs a detection signal; ,
A belt extension detection device comprising: a notification unit that notifies a warning based on a detection signal output from the detection unit.   The belt extension detection device according to claim 1, wherein the tension roller is configured to be movable to a position below the warning position. The detection unit detects that the tension roller has fallen below a predetermined notice position that is a notice position within the movement range of the tension roller and above the warning position, and outputs a notice signal. Configured,
The belt extension detection device according to claim 1, wherein the notification unit displays a notice message based on the notice signal.   The belt elongation detecting device according to claim 1, comprising a plurality of tension rollers.   5. The fixing mechanism according to claim 1, further comprising: a fixing mechanism that can fix and release the tension roller at an upper fixing position within the moving range and a lower fixing position below the upper fixing position. Belt stretch detection device. The fixing mechanism is
A rotation shaft of the tension roller having a pin hole in a direction perpendicular to the rotation shaft direction of the tension roller;
A fixing member having an upper fixing hole through which the pin inserted through the pin hole can be inserted at the upper fixing position and a lower fixing hole through which the pin inserted through the pin hole at the lower fixing position can be inserted. The belt stretch detection device according to claim 5. A belt stretch detection device according to any one of claims 1 to 6,
A heat treatment chamber for heat-treating the workpiece,
The belt is arranged so as to circulate and move between a first region that conveys the placed workpiece and a second region where the workpiece is not placed,
The heat treatment chamber is disposed in the first region;
The belt elongation detecting device is a firing furnace disposed in the second region. The belt is stretched between a drive stretch roller and a driven stretch roller, and is configured to move by being driven to rotate by a drive source.
The drive tension roller is disposed downstream of the outlet of the heat treatment chamber in the conveyance direction in which the workpiece is conveyed by the belt,
The driven tension roller is disposed upstream of the entrance of the heat treatment chamber in the transport direction,
The firing furnace according to claim 7, wherein the belt stretch detection device is disposed between a position corresponding to an entrance of the heat treatment chamber in the second region and the driven stretch roller.

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