JP2013104584A - Pusher type heating furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress cooling of a slider and outer temperature rising of a heating furnace when returning the slider from an outlet side to an inlet side of the heating furnace to be re-used for conveying a treated object after conveying the treated object from the inlet to the outlet of the heating furnace by the slider in the pusher type heating furnace.SOLUTION: The slider 14 is slidably held by a conveying guide member 12 disposed within the heating furnace 10 along a conveying direction of the treated object W, the slider is moved in order in the conveying direction of the treated object by a pusher 17 with the treated object held on the slider to convey the treated object held on the slider from the inlet 10b toward the outlet 10c of the heating furnace, thereafter the slider moved to the outlet side of the heating furnace is returned to the inlet side of the furnace along a return guide member 13 disposed within the heating furnace.

Description

  The present invention provides a plurality of conveying guide members in the heating furnace along the conveying direction of the object to be processed in the width direction of the heating furnace in parallel with a required interval, and holds the object to be processed for the above-mentioned conveying A plurality of sliders that move along the guide member are held by each conveyance guide member, and the sliders held by each conveyance guide member are moved sequentially in the conveyance direction of the object to be processed by the pusher, and are placed on the slider. The present invention relates to a pusher-type heating furnace that sequentially conveys the above-mentioned workpieces to be processed from the entrance to the exit of the heating furnace. In particular, in the pusher type heating furnace as described above, after the workpiece is transported from the inlet to the outlet of the heating furnace by the slider, the slider is returned from the outlet side of the heating furnace to the inlet side, and the slider is processed. When it is used again for conveying goods, it is characterized in that the slider is prevented from being cooled or the external temperature rising when returning from the outlet side of the heating furnace to the inlet side.

  Conventionally, pusher type heating furnaces and walking beam type heating furnaces have been used as heating furnaces in which workpieces such as steel slabs and steel plates are successively conveyed in a heating furnace to continuously heat them.

  Here, in the walking beam type heating furnace, generally, a plurality of fixed beams along the furnace length direction are provided on each support member standing on the hearth provided in the furnace, and A plurality of drive beams along the furnace length direction are provided on each support member protruding upward from the moving frame provided below and through the through-hole provided in the hearth. Then, the moving frame is supported by a rotating body provided in the walking beam driving means, and the driving beam provided in the moving frame is caused to walk by the walking beam driving means through the rotating body, thereby being covered. The processed products are moved sequentially in the heating furnace.

  Here, when the walking beams provided on the moving frame are moved by the walking beam driving means as described above, there is a problem that the walking beam driving means is enlarged. In addition, in order to provide the moving frame and the walking beam driving means as described above under the hearth of the heating furnace, it is necessary to increase the digging depth under the hearth. There is a problem that a great amount of cost is required and a large power is required to drive the walking beam driving means, resulting in a high running cost.

  On the other hand, in a pusher-type heating furnace, generally, as shown in Patent Documents 1 and 2, a guide member for conveyance along the conveyance direction of an object to be processed is disposed in the heating furnace with a predetermined interval in its width direction. A plurality of sliders that are provided in parallel and that hold the object to be processed and move along the above-described conveying guide member are held by each of the conveying guide members. Then, the sliders held by the transfer guide members are sequentially moved by the pusher in the transfer direction of the object to be processed, and the objects to be processed held on the slider are directed from the inlet to the outlet of the heating furnace. Are transported one after another.

  For this reason, in the pusher type heating furnace, unlike the walking beam type heating furnace, there is no moving frame or walking beam driving means for performing the walking operation of each moving beam provided on the moving frame below the hearth. , It is not necessary to increase the depth of digging under the hearth, equipment costs and running costs are greatly reduced, and the heat in the heating furnace does not escape through the through-holes provided in the hearth It is not necessary to provide a complicated mechanism.

  Here, in such a pusher-type heating furnace, the sliders held by the transfer guide members as described above are sequentially moved in the transfer direction of the object to be processed by the pushers and are held on the sliders. In addition, in order to transport the above-mentioned object to be processed in order from the entrance to the outlet of the heating furnace, when this slider is used again for transporting the object to be processed, after the object to be processed is conveyed to the outlet, It is necessary to return the slider from the outlet side of the heating furnace to the inlet side.

  Conventionally, the slider after the workpiece is conveyed to the outlet is generally taken out of the heating furnace, and the slider is returned from the outlet side of the heating furnace to the inlet side by a conveyor or the like.

  However, in this case, when the slider taken out from the heating furnace is returned from the outlet side of the heating furnace to the inlet side, the temperature of the slider decreases, and this slider is used again for transporting the workpiece. However, there is a problem that the slider is heated again, heat loss increases, the slider repeats thermal deformation, and its life is reduced, and the slider is returned from the heating furnace outlet side to the inlet side. There was also a problem that the external temperature increased.

Japanese Utility Model Publication No. 63-11555 JP-A-7-252520

  The present invention provides a plurality of conveying guide members in the heating furnace along the conveying direction of the object to be processed in the width direction of the heating furnace in parallel with a required interval, and holds the object to be processed for the above-mentioned conveying A plurality of sliders that move along the guide member are held by each conveyance guide member, and the sliders held by each conveyance guide member are moved sequentially in the conveyance direction of the object to be processed by the pusher, and are placed on the slider. It is an object of the present invention to solve the above-described problems in a pusher-type heating furnace in which held workpieces are sequentially conveyed from the entrance to the exit of the heating furnace.

  That is, according to the present invention, in the pusher type heating furnace as described above, after the workpiece is conveyed from the inlet of the heating furnace to the outlet by the slider, the slider is returned from the outlet side of the heating furnace to the inlet side. When the slider is used again to transfer the workpiece, the slider is cooled while the slider is returned from the outlet side of the heating furnace to the inlet side, or the external temperature at which the slider is returned from the outlet side of the heating furnace to the inlet side is It is an object to easily suppress rising.

  In the pusher-type heating furnace according to the present invention, in order to solve the above-described problems, a conveying guide member along the conveying direction of the object to be processed is placed in the heating furnace in the width direction of the heating furnace through a necessary interval. A plurality of sliders that are provided in parallel and that hold the object to be processed and move along the conveyance guide member are held by the conveyance guide members, and the sliders held by the conveyance guide members are covered by the pushers. In the pusher-type heating furnace that sequentially moves the workpieces in the conveyance direction and conveys the workpieces held on the slider sequentially from the inlet to the outlet of the heating furnace, A return guide member for returning each slider moved to the outlet side of the heating furnace along the guide member for return to the inlet side of the heating furnace was provided in the heating furnace.

  In the pusher type heating furnace of the present invention, the slider holding the object to be processed is conveyed from the inlet of the heating furnace to the outlet along the respective guide members for conveyance as described above, and then introduced to the outlet of the heating furnace. The slider is returned from the outlet side of the heating furnace to the inlet side along each return guide member provided in the heating furnace.

  Here, as described above, each slider that has conveyed the object to be processed from the entrance to the exit of the heating furnace along each conveyance guide member is heated along each return guide member provided in the heating furnace. When returning from the outlet side to the inlet side, a pusher for returning the slider in the return guide member from the outlet side of the heating furnace to the inlet side can be provided.

  Further, in the above pusher type heating furnace, when the return guide member for returning each slider moved to the outlet side of the heating furnace to the inlet side of the heating furnace is provided in the heating furnace, It is preferable to arrange the return guide member vertically in the heating furnace. As described above, when the conveying guide member and the returning guide member are arranged vertically in the heating furnace, the heating furnace is compared with the case where the returning guide member is provided in parallel to the conveying guide member in the heating furnace. Thus, the installation area of the heating furnace can be reduced.

  Further, when the conveyance guide member and the return guide member are arranged vertically in the heating furnace as described above, the raising and lowering moves the slider in the vertical direction respectively on the inlet side and the outlet side of the heating furnace. The slider is guided to the return guide member from the conveying guide member to the return guide member by the lifting device provided on the outlet side and returned to the inlet side by the lifting device provided on the inlet side. The slider can be returned from the return guide member to the transport guide member.

  Further, in the pusher-type heating furnace, in order to prevent the transfer guide member and the return guide member from being deformed by the heat in the heating furnace, in the transfer guide member and the return guide member, It is preferable to provide a cooling unit such as water cooling. If a cooling unit such as water cooling is provided inside the conveyance guide member and the return guide member as described above, the slider is also indirectly cooled and protected, and deformation due to heat is prevented.

  In the above pusher-type heating furnace, when the slider is held by the conveyance guide member or the return guide member so as to move along the conveyance guide member or the return guide member, the conveyance guide member or the return guide is used. In order to reduce the width of the member, a recess is provided in the bottom of the slider, and the slider can be moved to the transport guide member or the return guide member by fitting the upper part of the transport guide member or the return guide member into the recess. It is preferable to hold it.

  In the pusher-type heating furnace of the present invention, the sliders for transporting the object to be processed from the inlet to the outlet of the heating furnace along the respective conveying guide members as described above are used for each return provided in the heating furnace. Since it was made to return from the exit side of the heating furnace to the entrance side along the guide member, the slider after the workpiece was transported to the exit was taken out from the inside of the heating furnace, and this slider was removed from the exit side of the heating furnace by a conveyor or the like. Unlike the case of returning to the inlet side, the slider is not led to the outside of the heating furnace and cooled.

  As a result, in the pusher type heating furnace of the present invention, when the slider is returned from the outlet side of the heating furnace to the inlet side and used again for transporting the object to be processed, the slider is not heated again as in the prior art. In addition, the heat loss is greatly reduced, and the life of the slider is prevented from decreasing due to repeated thermal deformation. Further, when the slider is returned from the outlet side of the heating furnace to the inlet side, the external temperature is reduced. No longer rises.

In the pusher type heating furnace which concerns on embodiment of this invention, the schematic longitudinal cross-section explanatory drawing which showed the state which moves a slider from the entrance side of a heating furnace to the exit side along the guide member for conveyance with the pusher provided in the inlet side. It is. In the pusher-type heating furnace according to the above-described embodiment, a schematic longitudinal sectional view showing a state in which the slider is moved from the outlet side of the heating furnace to the inlet side along the return guide member by the pusher provided on the outlet side. is there. It is the schematic longitudinal cross-sectional explanatory drawing which cut the pusher type heating furnace which concerns on the same embodiment along the width direction, and showed the internal state. In the pusher-type heating furnace in the above embodiment, it is a cross-sectional explanatory view showing a state in which a cooling unit is provided in each of a conveyance guide member and a return guide member held by a support frame. The slider used in the pusher type heating furnace in said embodiment is shown, (A) is a front view, (B) is a top view. In the pusher type heating furnace in the above embodiment, it is a cross-sectional explanatory view showing a modified example in which the slider is movably held by the conveyance guide member and the return guide member.

  A pusher type heating furnace according to an embodiment of the present invention will be specifically described with reference to the accompanying drawings. In addition, the pusher type heating furnace according to the present invention is not limited to the one shown in the following embodiment, and can be appropriately changed and implemented within a range not changing the gist of the invention.

  In the pusher-type heating furnace 10 in this embodiment, as shown in FIGS. 1 to 3, a plurality of support frame bodies 11 are provided in the heating furnace 10 in the conveying direction of the workpiece W via a required interval, and A plurality of rows of support frame bodies 11 are provided in the width direction of the heating furnace 10 along the conveyance direction of the workpiece W.

  And in each row | line | column of this support frame 11, the guide member 12 for conveyance along the conveyance direction of the to-be-processed object W is hold | maintained on the 1st holding | maintenance part 11a in the upper part side of the support frame 11, and it heats. A plurality of rows of conveyance guide members 12 are provided in the width direction of the furnace 10 through a required interval, and a plurality of sliders 14 are held by each conveyance guide member 12 so as to be movable.

  Further, in each row of the support frame 11 described above, the return guide member 13 along the conveyance direction of the workpiece W is held on the second holding portion 11b on the lower side of the support frame 11, A plurality of return guide members 13 are provided in the width direction of the heating furnace 10 through a required interval, and a plurality of sliders 14 are moved and held by the respective return guide members 13.

  Here, in this embodiment, as shown in FIG. 4, the conveyance guide member 12 and the return guide member 13 are each made of a member having a concave cross section. The slider 14 is movably held in the recesses 12a and 13a of the guide member 13, and the water-cooled cooling units 12b and 12b are provided inside the transport guide member 12 and the return guide member 13, respectively. 13 b is provided, and the conveyance guide member 12 and the return guide member 13 are cooled through the cooling water in the cooling portions 12 b and 13 b.

  Further, in this embodiment, as the slider 14, as shown in FIGS. 5A and 5B, from the bottom part held in the recesses 12 a and 13 a of the transport guide member 12 and the return guide member 13. Also, the contact portion 14a of the slider 14 that contacts the workpiece W and holds the workpiece W has a reduced area. When such a slider 14 is used, the heat of the workpiece W heated through the contact portion 14 a of the slider 14 is less likely to escape to the slider 14 or the conveyance guide member 12.

  Moreover, in this embodiment, the raising / lowering apparatuses 15 and 16 which move the slider 14 to an up-down direction are provided in the entrance side and exit side of the heating furnace 10, respectively.

  Then, the slider 14 guided from the outlet side of the heating furnace 10 to the inlet side along the return guide member 13 is held and lifted by the cradle 15a of the lifting device 15 provided on the inlet side. The slider 14 is guided to a position corresponding to the conveyance guide member 12 described above. Further, the slider 14 guided from the inlet side to the outlet side of the heating furnace 10 along the conveying guide member 12 is held by the cradle 16a of the lifting device 16 provided on the outlet side, and is lowered. The slider 14 is guided to a position corresponding to the return guide member 13.

  Here, in this embodiment, when the slider 14 is moved in the vertical direction by the above-described lifting devices 15, 16, the lifting devices 15, 16 are provided in the space S below the hearth 10 a, The telescopic rods 15b and 16b that expand and contract in the vertical direction in the devices 15 and 16 are protruded into the heating furnace 10 through the hearth 10a, and the telescopic rods 15b and 16b are expanded and contracted, respectively. The cradles 15a and 16a provided on the cradle are moved up and down to move the slider 14 held by the cradles 15a and 16a in the vertical direction.

  Moreover, in the heating furnace 10 in this embodiment, the pushers 17 and 18 are provided in the entrance side and exit side of the heating furnace 10, respectively.

  Then, the pusher 17 provided on the entrance side guides the slider 14 held and lifted by the cradle 15 a of the lifting device 15 on the entrance side to the transport guide member 12 and moves to the transport guide member 12. The sliders 14 that can be held are moved sequentially from the inlet side to the outlet side of the heating furnace 10.

  In addition, the pusher 18 provided on the outlet side guides the slider 14 held and lowered by the cradle 16 a of the lifting device 16 on the outlet side to the return guide member 13 and moves to the return guide member 13. The sliders 14 that can be held are moved in order from the outlet side of the heating furnace 10 to the inlet side.

  In the pusher-type heating furnace 10 in this embodiment, as shown in FIG. 1, the slider 14 held on the cradle 15a is lifted by the lifting device 15 on the inlet side of the heating furnace 10, and the slider 14 is guided to a position corresponding to the conveyance guide member 12, and the workpiece W to be heat-treated from the inlet 10b of the heating furnace 10 is held by the slider 14 and the conveyance guide member 12 held by the cradle 15a. The slider 14 is held on the slider 14.

  Next, the slider 14 held on the cradle 15a of the lifting device 15 on the inlet side as described above is pushed by the pusher 17 provided on the inlet side, so that each slider 14 holding the workpiece W is guided for conveyance. The workpiece W is sequentially moved along the member 12 from the inlet side to the outlet side of the heating furnace 10 so that the workpieces W are sequentially heated in the heating furnace 10. In addition, the workpiece W thus heat-treated is taken out from the outlet 10c of the heating furnace 10, and the slider 14 guided to the outlet side of the heating furnace 10 is lifted by the lifting device 16 on the outlet side. It is made to hold | maintain on 16a.

  After the slider 14 is thus held on the cradle 16a of the lifting device 16 on the outlet side, the slider 14 held on the cradle 16a in the lifting device 16 is lowered as shown in FIG. The slider 14 is guided to a position corresponding to the return guide member 13, and the receiving base 15 a is lowered by the elevating device 15 on the entrance side, and the receiving base 15 a is moved to a position corresponding to the return guide member 13. Try to guide.

  Next, the slider 14 held on the cradle 16a of the lifting device 16 on the outlet side as described above is pushed by the pusher 18 provided on the outlet side, and each slider 14 held on the return guide member 13 is returned. The slider 14 is sequentially moved from the outlet side of the heating furnace 10 to the inlet side along the guide member 13, and the slider 14 guided to the inlet side is moved from the return guide member 13 to the cradle 15 a of the lifting device 15 on the inlet side. Try to keep it on top.

  In this way, the slider 14 after the workpiece W is transported from the inlet 10 b to the outlet 10 c of the heating furnace 10 along the transport guide member 12 is provided in the return guide member 13 provided in the heating furnace 10. Are sequentially returned from the outlet side of the heating furnace 10 to the inlet side, and the slider 14 after the workpiece W is transported to the outlet 10c of the heating furnace 10 is moved to the heating furnace 10 as in the prior art. There is no need to take out from the inside, and when returning the slider 14 from the outlet side of the heating furnace 10 to the inlet side, the slider 14 is not cooled.

  For this reason, when the slider 14 is returned from the outlet side of the heating furnace 10 to the inlet side and used again for transporting the workpiece W, the heat loss is greatly reduced without reheating the slider 14 as in the prior art. In addition, the lifetime of the slider 14 is also prevented from being shortened due to repeated thermal deformation, and the rise in the external temperature is also suppressed when the slider 14 is returned from the outlet side of the heating furnace 10 to the inlet side. It becomes like this.

  In the pusher-type heating furnace 10 according to this embodiment, the slider 14 is movably held by the transport guide member 12 and the return guide member 13, and the slider 14 is transported by the transport guide member 12 and the return guide member 13. However, the method of movably holding the slider 14 on the transport guide member 12 or the return guide member 13 is not limited to such a method. For example, in order to reduce the width of the conveyance guide member 12 and the return guide member 13, as shown in FIG. 6, as the conveyance guide member 12 and the return guide member 13, cooling portions 12 b and 13 b are provided inside. While the provided rectangular tube is used, a recess 14b is provided at the bottom of the slider 14, and the upper part of the conveying guide member 12 and the return guide member 13 is fitted into the recess 14b of the slider 14, so that the slider 14 may be held movably by the conveyance guide member 12 and the return guide member 13.

  In this embodiment, when the slider 14 is returned from the outlet side of the heating furnace 10 to the inlet side along the return guide member 13, a pusher 18 is provided on the outlet side of the heating furnace 10. Are moved sequentially from the outlet side of the heating furnace 10 to the inlet side along the return guide member 13. However, the method of returning the slider 14 along the return guide member 13 from the outlet side of the heating furnace 10 to the inlet side is not particularly limited. For example, the return guide member 13 is moved from the outlet side of the heating furnace 10 to the inlet side. The slider 14 guided to the return guide member 13 is slid by its own weight along the inclination of the return guide member 13 from the outlet side to the inlet side of the heating furnace 10. It is also possible to be moved.

  In this embodiment, the return guide member for returning the slider 14 from the outlet side of the heating furnace 10 to the inlet side is provided below the conveyance guide member 12 for transferring the slider 14 from the inlet side to the outlet side of the heating furnace 10. However, the position where the return guide member 13 is provided is not particularly limited. Although not shown, the return guide member 13 is provided on the transport guide member 12 by means such as suspending the return guide member 13 from the ceiling of the heating furnace 10, or the return guide member 13. May be provided in parallel to the side of the conveying guide member 12.

DESCRIPTION OF SYMBOLS 10 Heating furnace, 10a hearth, 10b inlet, 10c outlet 11 Support frame, 11a 1st holding part, 11b 2nd holding part 12 Guide member for conveyance, 12a Recessed part, 12b Cooling part 13 Returning guide member, 13a Recessed part, 13b Cooling part 14 Slider, 14a contact part, 14b Recessed part 15 Elevator on the inlet side of the heating furnace, 15a Receiving base, 15b Telescopic rod 16 Elevating apparatus on the outlet side of the heating furnace, 16a Receiving base, 16b Telescopic rod 17 Inlet side pusher 18 Heater outlet side pusher S Space W Workpiece

Claims (6)

  In the heating furnace, a plurality of conveying guide members along the conveying direction of the object to be processed are provided in parallel in the width direction of the heating furnace with a predetermined interval, and the objects to be processed are held along the conveying guide member. A plurality of sliders that are moved in the above manner are held by each conveyance guide member, and the sliders held in the respective conveyance guide members are sequentially moved by the pusher in the conveyance direction of the object to be processed, and are held on the sliders. In the pusher-type heating furnace that sequentially conveys the workpieces from the entrance to the exit of the heating furnace, the sliders moved to the exit side of the heating furnace along the above-described transport guide members are moved to the heating furnace. A pusher type heating furnace characterized in that a return guide member for returning to the inlet side is provided in the heating furnace.   2. The pusher-type heating furnace according to claim 1, further comprising a pusher for returning the slider in the return guide member from the outlet side to the inlet side of the heating furnace.   3. The pusher-type heating furnace according to claim 1, wherein the conveying guide member and the return guide member are arranged vertically in the heating furnace.   4. A pusher-type heating furnace according to claim 3, wherein a lifting device for moving the slider in the vertical direction is provided on each of the inlet side and the outlet side of the heating furnace, and is guided to the outlet side by the lifting device provided on the outlet side. The slider is guided from the conveying guide member to the returning guide member, and the slider returned to the inlet side by the lifting device provided on the inlet side is returned from the returning guide member to the conveying guide member. Pusher type heating furnace.   The pusher type heating furnace according to any one of claims 1 to 4, wherein a cooling part is provided inside the conveyance guide member and / or the return guide member. Furnace.   6. The pusher-type heating furnace according to claim 1, wherein a concave portion is provided in a bottom portion of the slider, and the upper portions of the conveyance guide member and the return guide member are fitted in the concave portion. The pusher-type heating furnace is characterized in that the slider is movably held by the conveyance guide member and the return guide member.