JP5045397B2 - Continuous vacuum carburizing furnace - Google Patents

Description

  The present invention relates to a continuous vacuum carburizing furnace having a front chamber, a heating chamber, a carburizing chamber, and a cooling chamber arranged in series, and performing a carburizing process on a processed product in a vacuum state.

Conventionally, a continuous vacuum carburizing furnace having a front chamber (charging chamber), a heating chamber, a carburizing chamber, and a cooling chamber arranged in series is often used as a furnace for performing continuous vacuum carburizing processing of processed products such as iron alloy parts. (For example, refer to Patent Documents 1 and 2.)
JP 2004-107705 A JP 2006-137964 A

  However, in these continuous vacuum carburizing furnaces, as a transfer means for sequentially transferring the processed products to each chamber, a roller hearth type transfer device is used in the furnace described in Patent Document 1, and walking is performed in the furnace described in Patent Document 2. Since each of the beam-type internal feeding devices is used, each component of these transfer devices provided in the carburizing chamber, particularly the iron-based alloy member, is repeatedly subjected to vacuum carburizing treatment at a high temperature. It becomes fragile due to distortion and toughness and becomes brittle, and it causes malfunction due to adhesion and accumulation of soot and tar on the movable member, and it is necessary to repair and replace the transfer device in a short period of time. During the maintenance and replacement work period, the continuous vacuum carburizing process was interrupted, which had the problem of hindering furnace operation.

  The present invention is intended to solve the above-mentioned conventional problems, and the transfer device for processed products is not exposed to the vacuum carburizing atmosphere in the carburizing chamber, and the transfer device is deteriorated or malfunctioned due to vacuum carburizing. An object of the present invention is to provide a continuous vacuum carburizing furnace capable of preventing the above.

  In order to achieve the above object, a continuous vacuum carburizing furnace according to claim 1 is a continuous vacuum carburizing furnace having a front chamber, a heating chamber, a carburizing chamber, and a cooling chamber arranged in series, wherein the heating chamber and the carburizing chamber are provided. In addition, a transfer chamber is provided between the carburizing chamber and the cooling chamber via a partition door, and a support for supporting a processed product is provided in each of the heating chamber, the carburizing chamber, and the cooling chamber, and is driven up and down. A transfer device having a telescopic arm which is driven to extend and contract in both the front and rear directions on the base material portion to be provided in each of the transfer chambers, and a processed product in a processing chamber on the front side of each of the transfer chambers by the transfer device Is transferred to the processing chamber on the rear stage side.

  In this invention, the `` front '' side refers to the upstream side (the front process chamber side) of the processed product that is transferred through the furnace and proceeds from the front process (front stage) side to the rear process (back stage) side. "Side" refers to the opposite direction side, and "left and right" refers to the left and right direction on the horizontal plane with respect to the front and rear direction.

  According to the first aspect of the present invention, the processed product in the heating chamber is transferred to the carburizing chamber and the processed product in the carburizing chamber is transferred to the cooling chamber by the transfer device having the telescopic arm on the base material portion. The transfer device after the transfer can be accommodated in each transfer chamber with the telescopic arm shortened, and the processed product is carburized in the carburizing chamber partitioned by each transfer chamber and the partition door. The transfer device is not exposed to the vacuum carburizing atmosphere in the carburizing chamber.

  According to a second aspect of the present invention, there is provided a continuous vacuum carburizing furnace having a front chamber, a heating chamber, a carburizing chamber, and a cooling chamber arranged in series, and a transfer chamber between the heating chamber and the carburizing chamber via a partition door. And a heating device, a carburizing chamber, and a cooling chamber, each of which is provided with a support for supporting a processed product, and a telescopic arm that is extended and retracted in both front and rear directions on a base member that is driven up and down. Are provided in the transfer chamber and the cooling chamber, respectively, and the processed product in the heating chamber is transferred to the carburizing chamber and the processed product in the carburizing chamber is transferred to the cooling chamber by the transfer device, respectively. In the cooling chamber, a pair of heat shield plates arranged in parallel on a horizontal plane located on the upper side of the transfer device in a lowered state and extending in the front-rear direction guided to be movable in the left-right direction, and a lower surface of the heat shield plate Along And a fixed plate fixed to the furnace body with an opening extending in the front-rear direction, and a drive unit that closes and opens the opening by driving the heat shield plates close to and away from each other. An open / close shutter-type heat shield device, and the heat shield in a state in which the opening is closed between the processed product transferred to the cooling chamber and supported on a gantry and the transfer device in the lowered state. It is characterized by being partitioned by a plate.

  According to the second aspect of the present invention, the processed product in the heating chamber is transferred to the carburizing chamber and the processed product in the carburizing chamber is transferred to the cooling chamber by the transfer device having a telescopic arm on the base member. The transfer device after the transfer can be accommodated in the transfer chamber and the cooling chamber with the telescopic arm shortened, and the carburization of the processed product in the carburizing chamber divided by the transfer chamber, the cooling chamber and the partition door. By performing the treatment, the transfer device is not exposed to the vacuum carburizing atmosphere in the carburizing chamber. In addition, a transfer device for extracting a processed product from the carburizing chamber is provided in a cooling chamber adjacent to the carburizing chamber without providing a transfer chamber between the carburizing chamber and the cooling chamber. Is not required, and the overall length of the vacuum carburizing furnace, and thus the furnace installation space, can be reduced.

  Also, in the cooling chamber, the carburized chamber is divided between the processed product supported on the gantry for the cooling process and the transfer device in the lowered state by the heat shield plate of the open / close shutter type heat shield device. Since the heat shield plate prevents the radiant heat from the high-temperature processed product immediately after being transferred from the inside to the cooling chamber from reaching the transfer device, the transfer device can be used without any trouble for a long time without being heated to a high temperature. is there.

  The invention according to claim 3 is the continuous vacuum carburizing furnace according to claim 2, wherein a support for supporting a processed product provided in the cooling chamber is a lowered position which is a delivery position of the processed product by the transfer device, and A gantry raising / lowering device is provided for raising and lowering between a support beam portion extending in the front-rear direction of the gantry and an elevated position located above the upper end portion of the heat shield plate.

  According to the third aspect of the present invention, in the cooling chamber, the gantry lifting device can position the gantry in the lowered position when the processed product is delivered by the transfer device, and the gantry in the raised position when the processed product is cooled. Therefore, it is not necessary that the lifting and lowering stroke of the transfer device provided in the cooling chamber be of a particularly large stroke. Can measure.

  According to a fourth aspect of the present invention, there is provided a continuous vacuum carburizing furnace having a front chamber, a heating chamber, a carburizing chamber, and a cooling chamber arranged in series, and a transfer chamber between the heating chamber and the carburizing chamber via a partition door. And a heating device and a carburizing chamber, each of which includes a support for supporting a processed product and a telescopic arm that is telescopically driven in both front and rear directions on a base member that is driven to move up and down. Provided in each of the transfer chamber and the cooling chamber, and provided with support piece portions for supporting left and right side edges of the bottom surface of the processed product as the processed product support device in the cooling chamber, the support piece at the delivery position of the processed product by the transfer device A gondola that is driven up and down by a driving machine provided in the upper part of the cooling chamber between a descending position where the section is located and an ascending position that is elevated by a predetermined stroke from the descending position is provided by the transfer device. The processed product in the heating chamber is transferred to the carburizing chamber, the processed product in the carburizing chamber is transferred to the cooling chamber, and the cooling chamber is positioned above the transfer device in the lowered state. And a pair of heat shield plates extending in the front-rear direction that are arranged in parallel and guided to be movable in the left-right direction, and an opening that is disposed along the lower surface of the heat shield plate and extends in the front-rear direction. Provided with an open / close shutter type heat shield device comprising a fixed plate and a drive unit that closes and opens the opening by driving the heat shield plates close to and away from each other, and is transferred to the cooling chamber. The treatment product supported by the gondola in the raised position and the transfer device in the lowered state are partitioned by the heat shield plate in a state where the opening is closed.

  According to the invention described in claim 4, similarly to the invention described in claim 2, the processed product in the heating chamber is processed into the carburizing chamber and the processing in the carburizing chamber by the transfer device provided with the telescopic arm on the base portion. The product can be transferred to the cooling chamber, and the transfer device after the transfer can be accommodated in the transfer chamber and the cooling chamber with the telescopic arm shortened. By performing the carburizing process of the processed product in the partitioned carburizing chamber, the transfer device is not exposed to the vacuum carburizing atmosphere in the carburizing chamber. In addition, a transfer device for extracting a processed product from the carburizing chamber is provided in a cooling chamber adjacent to the carburizing chamber without providing a transfer chamber between the carburizing chamber and the cooling chamber. Is not required, and the overall length of the vacuum carburizing furnace, and thus the furnace installation space, can be reduced.

  Also, in the cooling chamber, the gondola can be positioned in the lowered position when the processed product is delivered by the transfer device, and the gondola can be positioned in the raised position during the cooling process. There is no need for a stroke, and it is possible to reduce the size of the transfer device, to make it common, and to make the control common by using the same type of machine as the transfer device provided in the transfer chamber. In addition, the gondola is lifted and lowered in a suspended state by a drive unit provided in the upper part of the cooling chamber, so there is no need to provide a lift drive mechanism below the gondola. There is no need to secure the space for installing the drive unit in the lower part of the cooling chamber or to set the processing product pass line at the upper position, and the size and simplification of the structure of the lower part of the cooling chamber and the furnace height of the entire vacuum carburizing furnace are reduced. Can be measured.

  Then, in the cooling chamber, between the processed product supported on the gondola (on the supporting piece part thereof) in the ascending position for the cooling process and the transfer device in the lowered state, the heat shield of the open / close shutter type heat shield device Since the partitioning is performed by the plate, the heat shield plate prevents the radiant heat from the high-temperature treated product immediately after being transferred from the carburizing chamber to the cooling chamber from reaching the transfer device, and the transfer device is heated to a high temperature. It can be used without any trouble for a long time.

  According to a fifth aspect of the present invention, in the continuous vacuum carburizing furnace according to the fourth aspect, the side heat shield disposed on the left and right side surfaces of the gondola so as to face the left and right side surfaces of the processed product supported by the gondola. A board is attached.

  According to the fifth aspect of the present invention, the radiant heat from the left and right side surfaces of the high-temperature treated product immediately after being transferred from the carburizing chamber to the cooling chamber and supported by the gondola (on the supporting piece portion) is subjected to side heat insulation. Because it is shielded by the plate, this radiant heat causes overheating and deterioration of each part of the furnace body located on both the left and right sides of the treated product, such as the partition between the cooling air circulation path on the side of the furnace body side and the treated product containing part. Is prevented.

  According to a sixth aspect of the present invention, in the continuous vacuum carburizing furnace according to any one of the second to fifth aspects, a heat insulating plate extending upward is fixedly provided at both front and rear ends of the heat shield plate, and the shield. Insulation that partitions between the front and rear side surfaces of the processed product accommodated in the cooling chamber and the front and rear wall plates of the cooling chamber by the heat insulating plate moved together with the heat shielding plate and in the closed state when the hot plate is closed It is characterized in that a wall is formed.

  According to the sixth aspect of the present invention, the heat insulating plate is driven to be opened and closed integrally with the heat shield plate, and is opened when the processed product is transferred and does not hinder the transfer. Since the front and rear side surfaces, the front and rear wall plates of the cooling chamber, and the door for opening and closing the opening provided in the wall plate portion are partitioned at positions close to the front and rear side surfaces, the radiant heat from the high-temperature processed product It is possible to prevent the temperature of the wall plate and the door portion from rising, and it is not necessary to attach a large-scale heat insulating material to the wall plate and the door portion and increase the opening / closing stroke of the door by this attachment.

  The invention according to claim 7 is the continuous vacuum carburizing furnace according to any one of claims 2 to 6, wherein the surface is on the upper surface side of the heat shield plate and the surface is directed upward toward the front end side of the heat shield plate. And a rectifying member for deflecting the cooling air upward when the heat shield is closed.

  According to the seventh aspect of the present invention, when the heat shield plate is closed, the cooling air is deflected upward by the rectifying body portion located at the left and right central portions below the processed product, so that the cooling air becomes a substantially uniform flow. Since the product is sprayed onto the product, the treated product is cooled almost uniformly, and a complicated device such as a rectifying plate that is separate from the heat shield is provided below the product to be moved back and forth. Is obtained.

  As described above, according to the first aspect of the present invention, the processed product is introduced into the carburizing chamber by the transfer device having the telescopic arm provided in each transfer chamber provided on the front side and the rear side of the carburizing chamber. Since the feeding / extraction is performed, the transfer device is not exposed to the vacuum carburizing atmosphere in the carburizing chamber, and it is possible to prevent the transfer device from being deteriorated or malfunctioning due to the vacuum carburizing.

  Further, according to the invention described in claim 2, the processed product is fed into and extracted from the carburizing chamber by a transfer device provided with a telescopic arm provided in the transfer chamber and the cooling chamber provided on the front side of the carburizing chamber. As a result, the transfer device is not exposed to the vacuum carburizing atmosphere in the carburizing chamber, can prevent the transfer device from deteriorating or malfunction due to vacuum carburizing, and is adjacent to the carburizing chamber. Since the transfer device is provided in the cooling chamber, the installation space in the furnace length direction of the vacuum carburizing furnace can be reduced. Further, since the transfer device provided in the cooling chamber and the processed product supported in the cooling chamber are partitioned by the heat shield plate of the open / close shutter type heat shield device, the transfer device is heated to a high temperature by the processed product. It can be used without any trouble for a long time.

  Further, in addition to the effect of the invention described in claim 2, according to the invention described in claim 3, since the gantry lifting device is provided in the cooling chamber, the transfer device provided in the transfer chamber is used as the transfer device provided in the cooling chamber. The same type machine or a transfer device having a similar lifting stroke can be used.

  According to the invention described in claim 4, in addition to the effect of the invention described in claim 2, the gondola is driven up and down by the driving device provided in the upper part of the cooling chamber. In comparison, the lower structure of the cooling chamber is reduced in size and simplified, and the furnace height of the entire vacuum carburizing furnace can be reduced.

  Further, in addition to the effect of the invention described in claim 4, according to the invention described in claim 5, since the radiant heat from the left and right side portions of the high-temperature processed product is shielded by the side heat shield plates, Overheating of each part of the furnace body located on the left and right sides of the product can be prevented.

  In addition to the above effect, according to the invention described in claim 6, since the radiant heat from the front and rear side surfaces of the high-temperature processed product is insulated by the heat insulating plates, both the front and rear wall plates of the cooling chamber and the openings thereof. Excessive temperature rise of the door for opening and closing can be prevented.

  In addition to the above effect, according to the seventh aspect of the invention, the cooling air is blown onto the processed product in a substantially uniform flow by the rectifying member of the heat shield plate, so that the processed product is cooled substantially uniformly. Is done.

  An embodiment of the present invention will be described below with reference to a first example shown in FIGS. In FIG. 1, 1 is a continuous vacuum carburizing furnace, 2 is a front chamber (charging chamber), 3 is a heating chamber, 4 is a carburizing chamber, 5 is a cooling chamber, and 6 is between the heating chamber 3 and the carburizing chamber 4. It is a provided transfer chamber. Partition doors 11a to 11d are provided between the chambers, and the chambers (furnace shell portions) are integrally connected to each other, but have a structure that can be separated at the time of maintenance or the like. It has wheels at the bottom. Reference numeral 12 denotes an inlet for charging a processed product, and reference numeral 13 denotes an outlet for taking out. The doors 16 and 17 are opened and closed by air cylinder type opening and closing devices 14 and 15, respectively. Each of the partition doors 11a to 11d is opened and closed by a horizontal cylinder type opening and closing device 18. Further, the processed product W, which is a vacuum carburization target object in this furnace, is schematically illustrated in the shape of a square body in each drawing. Specifically, the processed product W is provided on the shelf plate portion of a holder having a plurality of shelf plates. It has a form suitable for vacuum carburizing treatment and transfer, such as holding a large number of processing target parts and supporting them on a tray, or holding the above processing target parts in a basket and supporting them on a tray. In the present invention, those collected as processing unit products of these forms are referred to as processing products, and the bottom surface of the processing product W refers to the bottom surface of the processing unit products, specifically the bottom surface of the tray.

  Each chamber from the front chamber 2 to the cooling chamber 5 is connected to a vacuum exhaust device (not shown), the carburizing chamber 4 is a carburizing gas supply source (not shown), and the cooling chamber 5 is an atmospheric gas (nitrogen gas) supply source (not shown). Are connected to each other. Further, the heating chamber 3 and the carburizing chamber 4 are each provided with an unillustrated electrothermal heater in a room surrounded by heat insulating walls 21 and 22 provided in the furnace shell, and a processed product W fixed to the furnace shell. Supporting pedestals 25, 25 are provided. As shown in FIG. 2, the gantry 25 has a U-shaped frame body in which columns 25 b are fixed to both front and rear ends of a support beam 25 a extending in the front-rear direction for supporting the left and right side edges of the bottom surface of the processed product W. The two telescopic arms 31 (specifically, the upper arm 34 in detail) of the transfer device 30 to be described later can enter the space portion. The cooling chamber 5 is provided with a gantry lifting device 70 that lifts and lowers the gantry 25 having the same configuration as described above for supporting the processed product W. The configuration will be described later together with the detailed structure of the cooling chamber 5.

  Reference numeral 30 denotes a transfer device for transferring the processed product W, which is also provided in the transfer chamber 6, the cooling chamber 5, and the front chamber 2 in this example. The transfer device 30 has a configuration shown in FIGS. These drawings show the transfer device 30 provided in the transfer chamber 6, but those provided in the cooling chamber 5 and the front chamber 2 also have the same configuration. In the figure, 31 is a telescopic arm, and an intermediate arm 33 is supported on the base arm 32 so as to be movable in the longitudinal direction, and an upper arm 34 is supported on the intermediate arm 33 so as to be movable in the longitudinal direction. Accordingly, the intermediate arm 33 and the upper arm 34 are interlocked to extend from the illustrated shortened (origin) state to the front indicated by the arrow S and to the rear indicated by the arrow T in the drawing, and are driven back to the shortened state. . In addition, as a support structure for the base arm 32 of the intermediate arm 33 and a support structure for the intermediate arm 33 of the upper arm 34, the other arm is elongated by a roller arranged in parallel in the arm longitudinal direction on one of the relatively moving arms. Although it has a structure that is movably supported in the direction, detailed illustration thereof is omitted.

  As shown in FIG. 3 and FIG. 4, a rectangular frame as a support member that is driven up and down by connecting the front and rear ends of the base arms 32 and 32 of the two telescopic arms 31 and 31 with two connecting beams 35. A driving piece 37 that also serves as a guide is fixed downward on both the left and right ends of each connecting beam 35. Reference numeral 38 denotes a support base fixedly provided at the bottom of the furnace shell 6 a of the transfer chamber 6, and guide plates 39 erected and fixed at the four corners of the support base 38 are provided in the vertical grooves provided in the drive pieces 37 of the elevating frame 36. Thus, the elevating frame 36, and thus each telescopic arm 31, is guided by a guide plate 39 so as to be movable up and down.

  As shown in FIGS. 3 and 6, a drive shaft 42 connected to an output shaft of a rotary drive machine 40 attached to the outside of the furnace shell 6a via a joint 41 is rotated at the front and rear central portion of the support base 38. The driven shafts 45a and 45b, which are supported freely and are rotationally driven via the chains 44 and 44 by the sprockets 43 and 43 provided on the drive shaft 42, can be freely rotated at both front and rear ends of the support base 38 by bearings (not shown). It is supported. As shown in FIG. 5, a crank-shaped (eccentric cam-shaped) drive element 47 that supports a drive roller 46 at a position eccentric from the axis of the driven shaft is fixed to both ends of each driven shaft 45a, 45b. The drive roller 46 is engaged with a groove 48 extending in the front-rear direction that is recessed on the inner surface side of the drive piece 37, and the lift frame 36 and its upper support ( The processed product W is included when the processed product W is transferred), and the driven shafts 45a and 45b are rotated 180 degrees via the chain drive mechanism by the rotation drive unit 40, whereby the elevating frame 36 and its upper support Is lifted from the lowering position shown in the figure by an ascent / descent stroke Y corresponding to twice the eccentric amount of the drive roller 46 and the driven shafts 45a and 45b, and further lowered to the lowering position shown in the figure by rotation of these driven shafts by 180 degrees. It is dynamic.

  Next, as shown in FIG. 7, each telescopic arm 31 has a drive shaft 51 for simultaneously rotating and driving the drive sprockets 50 and 50 in each drive box 49 provided at the front and rear intermediate portions of the base arm 32. The telescopic arm 31 is extended and driven by the rotation of the drive shaft 51 in the following manner by connecting to an output shaft of a rotary drive machine 52 attached to the outside via a joint 53.

  That is, as schematically shown in FIG. 8, the sprockets 54 a and 54 b built and pivotally supported at both front and rear ends of the base arm 32, the sprockets 55 and 55 pivotally supported in the drive box 49, and the drive sprocket 50 The drive chain 56 is wound, and a plurality of serially arranged teeth 57 that mesh with the drive chain 56 are fixed to the lower surface of the upper side of the intermediate arm 33 so as to protrude downward. , The intermediate arm 33 is driven forward (arrow S direction) or backward (arrow T direction) via the drive chain 56 and the teeth 57. On the other hand, for the interlocking of the arms, a roller 58a for interlocking is built in and supported at the front end of the intermediate arm 33, and a roller 58b is incorporated and pivotally supported at the rear end of the intermediate arm 33. An interlocking chain 59a having one end P fixed to the lower surface of the upper side is wound around the roller 58a, and the other end is fixed to the base arm 32, and one end Q is fixed to the lower surface of the upper side of the upper arm 34. After the interlocking chain 59b is wound around the roller 58b, the other end is fixed to the base arm 32.

  When the drive shaft 51 is rotationally driven in the direction of the arrow U as shown in FIG. 8A due to the arrangement of the chains described above, the intermediate arm 33 is moved forward (through the teeth 57) by the drive chain 56 that moves in the direction of the arrow. The upper arm 34 moves on the intermediate arm 33 by an amount equal to the amount of movement of the intermediate arm 33 (therefore, with respect to the base arm 32). (Ie, twice the amount of movement) and is moved forward to the extended state. When the drive shaft 51 is rotationally driven in the direction of arrow V as shown in FIG. 5B, the intermediate arm 33 moves backward (in the direction of arrow T) in the opposite direction, and the upper arm 34 is moved to the intermediate arm by the chain 59b. It moves backward on 33 and is driven backward to the extended state. When returning to the shortened state shown in FIG. 3 from the state extended forward, the same drive as in FIG. 8B and the interlocking action by the chain 59b, and when returning to the same shortened state from the rear extended state. By the same driving as in FIG. 8A and the interlocking action by the chain 59a, the shortened state is restored.

  For the transfer device 30 provided in each of the chambers, a gantry 25 provided in each chamber (a cradle 25 in a lowered state described later in the cooling chamber 5) and a charging table and an extraction table provided outside the furnace (not shown). Each of the upper surfaces (processed product W support surfaces) is at an intermediate position between the upper surface position of the transfer device 30 (the upper surface of the upper arm 34) at the lowered position and the raised position that is raised by the ascending / descending stroke Y. For example, in order to transfer the processed product W from the heating chamber 3 into the carburizing chamber 4 by the transfer device 30 in the transfer chamber 6, the telescopic arm 31 held at the lowered position is moved forward with each partition door opened. When the upper arm 34 reaches the lower side of the processed product W on the gantry 25 of the heating chamber 3 by extending, the elevating frame 36 (and thus the telescopic arm 31) is driven upward to bring the processed product W onto the upper arm 34. Then, the telescopic arm 31 is pulled back to the shortened state and further driven to extend rearward. When the processed product W reaches the frame 25 of the carburizing chamber 4, the elevating frame 36 (telescopic arm 31) is driven downward. When the processed product W is transferred onto the gantry 25 and the telescopic arm 31 is returned to the shortened state, the transfer is completed. Also with the transfer device 30 provided in another chamber, the processed product W can be transferred by the same lifting / lowering / extending operation. In the cooling chamber 5, a platform 25 that is driven up and down, which will be described later, is provided in the same chamber as the transfer device 30. The processed product W is transferred onto the extraction table by the same lifting and lowering and expansion / contraction operations of the transfer device 30 as described above.

  Next, FIGS. 9 and 10 show the detailed structure of the cooling chamber 5, 61 is a partition wall that surrounds the top and sides of the processed product W during cooling, and 62 is formed between the partition wall 61 and the furnace shell 5 a. The atmospheric gas circulation path, 63 is a blower for atmospheric gas circulation, 64 is a cooler composed of a heat exchanger for cooling the atmospheric gas, and 65 and 65 are partition walls that partition the front and rear ends of the circulation path 62. The partition wall 65 is provided with an opening 66 having the same opening width as the left and right width of the partition wall 61. The same transfer device 30 as the transfer chamber 6 (and the front chamber 2) is installed on a support base 67 fixed to the bottom of the furnace shell 5a, and the base 25 for transferring the processed product W is a base. The lowering position indicated by the chain line in FIG. 9, which is the delivery position of the processed product W by the transfer device 30, and the support beam 25 a portion extending in the front-rear direction of the gantry 25 are It is driven up and down between the upper position indicated by the solid line located above the upper end of 81a.

  In this example, as the gantry lifting device 70, the four long columns 25 b of the gantry 25 are passed through the bottom of the furnace shell 5 a and the lower ends thereof are connected to the lifting platform 71. A piston rod of a hydraulic cylinder 76 in which two sets of undulating levers 74 and 75 having a central portion pivotally attached by a shaft 73 are interposed between the provided bases 72 and a cylinder portion is attached between the shafts 73 and 73. In addition, an elevating drive mechanism is used in which a roller 77 is attached which is nipped between the edge surfaces of the levers 74 and 75 and changes the angle between the levers 74 and 75 by moving back and forth to drive the elevating platform 71 up and down. Each of the levers 74 and 75 is pivotally attached at one end (right end in FIG. 9) to the lift 71 and base 72, and rolls on the bottom plate surface of the base 72 at the other end of the lever 74. A roller 74a and a roller 75a that rolls on the lower surface of the top plate of the elevator 71 are pivotally attached to the other end of the lever 75, respectively. Then, by driving the piston rod of the hydraulic cylinder 76, both levers 74 and 75 sandwiching the roller 77 are driven in the direction of widening the sandwich angle, and the gantry 25 is in the raised state shown by the solid line in FIG. Further, if the piston rod of the hydraulic cylinder 76 is driven in the extending direction, the levers 74 and 75 are driven in the narrowing angle reducing direction by the weight of the lifting platform 71 and its upper parts as the roller 77 moves forward. The gantry 25 is switched to a lowered state indicated by a chain line in FIG.

  On the other hand, 81 and 81 are a pair of heat shield plates extending in the front-rear direction arranged in parallel on a horizontal plane located on the upper side of the transfer device 30 in the lowered state, and 82 and 82 are along the lower surface of the heat shield plate 81. A fixed plate that is disposed and is fixed to the furnace shell 5a with an opening 83 (see FIG. 11) extending in the front-rear direction. Each heat shield plate 81 is moved in the left-right direction by a guide 84 provided on the fixed plate 82. In this example, each of the heat shield plate 81 and the fixed plate 82 has a structure in which a ceramic molded body is fixed to the surface of a form frame of ordinary steel. Reference numeral 85 denotes an air cylinder type driving machine that drives the heat shielding plate 81 close to and away from each other. By this driving machine 85, the heat shielding plates 81, 81 and the fixed plates 82, 82, an open / close shutter type heat shielding device 80 is provided. Is formed. Further, in this example, on the upper surface side of the heat shield plates 81, 81, there are provided rectifying body portions 81a whose surfaces are curved upward toward the front end side of the heat shield plates, and at both front and rear ends of the heat shield plates 81, 81. The heat insulating plates 86, 86 made of a ceramic molded body and extending upward are integrally provided upright, and the upper end portions of these heat insulating plates are guided by a guide 87 extending in the left-right direction provided on the outer surface portion of the partition wall 65. Has been. Then, as shown in FIGS. 11B and 12B, each of the heat shield plates 81 is in an elevated state when the heat shield plates 81 and 81 are driven close to each other to close the opening 83. In order not to interfere with the support column 25b of the gantry 25, two notches 81b that open toward the tip are provided.

  The lifting / lowering operation of the gantry 25 and the opening / closing operation of the heat shield plate 81 will be described together with the operation of the transfer device 30 related thereto. The processed product W on the gantry 25 in the carburizing chamber 4 is put into the cooling chamber 5. When transporting, as shown in FIG. 11, the heat shield plates 81 and 81 of the heat shield device 80 are retracted to leave the opening 83 open, the gantry 25 is lowered, and the transfer device 30 is lowered. The processed product W is transferred onto the gantry 25 by the shortening drive and the descent drive following the extension drive and the lift drive of the telescopic arm 31 into the carburizing chamber 4. (Note that FIGS. 11 and 12 schematically show only the heat shield device 80 and the gantry 25 in FIG. 10.) Subsequently, as shown in FIG. The heat shield plates 81 and 81 are driven close to each other and the opening 83 is closed. As a result, the heat insulating plates 86 and 86 that are the same body as the respective heat shielding plates 81 are also driven close to each other as shown in the same figure, and the opening 66 (see FIG. 9) of the partition wall 65 is closed. In this state, the blower 63 is operated to cool the processed product W in the cooling chamber 5. After the cooling process, the heat shield plates 81 and 81 (and the heat insulating plates 86 and 86) are first driven in the separation direction. 11, and then the gantry 25 is driven downward to the lowered position, and then the processed product W is extracted outside the furnace (not shown) by the upward drive of the transfer device 30 and the backward extension and downward drive of the telescopic arm 31. It may be transferred to a table and the telescopic arm 31 is driven to be shortened so as to be accommodated in the cooling chamber 5.

  In order to perform the vacuum carburizing process of the processed product W by the continuous vacuum carburizing furnace 1 equipped with each apparatus having the above-described configuration, the processed product W on the delivery table (not shown) is transferred into the front chamber 2 and waited. It is transferred to the heating chamber 3 for heat treatment, and the processed product W after heating is transferred to the carburizing chamber 4 through the transfer chamber 6 and vacuum carburized, and then transferred to the cooling chamber 5 for nitrogen gas under normal pressure. After the cooling process by circulation, the process of sending out to an extraction table outside the furnace (not shown) is continuously performed on a plurality of processed products W that are sequentially conveyed in the furnace. At this time, in addition to the indoor pressure adjustment at the time of processing in each processing chamber, when the processed product W is transferred, the pressure adjustment such as the pressure in the two adjacent chambers is set to the same level through the partition door, the progress of the processing step Appropriately depending on the situation.

  Transfer of the processed product W into the heating chamber 3, transfer of the processed product W in the heating chamber 3 into the carburizing chamber 4, and transfer of the processed product W in the carburizing chamber 4 into the cooling chamber 5, Each of them is performed by using the transfer device 30 and the above-described lifting and lowering and extension / reduction driving. And the transfer apparatus 30 after these transfer processes is accommodated in the front chamber 2, the transfer chamber 6, and the cooling chamber 5, respectively, with the telescopic arm 31 shortened, and is partitioned by these chambers and the partition doors 11a to 11d. Thus, the heat treatment of the processed product W in the heating chamber 3 and the vacuum carburizing treatment of the processed product W in the carburizing chamber 4 are performed.

  As a result, the transfer device 30 provided in the transfer chamber 6 and the transfer device 30 provided in the cooling chamber 5 are both exposed to the vacuum carburizing atmosphere in the carburizing chamber 4 and vacuum carburized along with the processed product W. Therefore, these transfer devices can be used without any trouble for a long time without causing deterioration or malfunction due to vacuum carburization. Further, since the transfer device 30 for extracting the processed product W from the carburizing chamber 4 is provided in the cooling chamber 5 and no transfer chamber is provided between the carburizing chamber 4 and the cooling chamber 5, a continuous vacuum carburizing furnace is provided. The total length of 1 is short.

  As described above, the cooling process of the processed product W in the cooling chamber 5 is performed by moving the processed product W after the vacuum carburizing process by the transfer device 30 onto the lowered platform 25 and then driving the platform 25 upward. The heat shield plates 81 and 81 of the heat shield device 80 are driven in close proximity to each other, and the opening 83 is closed. As a result, since the processed product W supported on the gantry 25 and the transfer device 30 in the lowered state are partitioned by the heat shield plates 81, 81, the radiant heat from the high-temperature processed product W immediately after the transfer is generated. Reaching the transfer device 30 is prevented by the heat shield plates 81, 81, and the transfer device 30 can be used without any trouble for a long time without being heated to a high temperature.

  At the time of the above cooling process, the cooling air flowing into the furnace center side from the circulation path 62 through the lower opening of the partition wall 61 in FIG. 10 passes through the closed heat shield plates 81 and 81 shown by chain lines in FIG. Since each rectifier 81a is deflected upward as indicated by a broken line arrow and is sprayed on the processed product W in a substantially uniform flow, the processed product W is cooled substantially uniformly. Further, the heat insulating plates 86, 86 driven integrally with the heat shield plates 81, 81 close the opening 66 of the partition wall 61, and both front and rear side surfaces of the processed product W and both front and rear wall plates of the cooling chamber 5. Since the doors 5b and 5c and the doors for opening and closing the openings provided in the wall plates are partitioned, the wall plates and the door portions are prevented from being excessively heated by the radiant heat from the processed product W.

  Further, in the cooling chamber 5, the gantry 25 is moved by the gantry lifting device 70 to the lowered position when the processed product W is delivered by the transfer device 30, and is moved to the raised position that holds the processed product W above the heat shield plates 81, 81 during the cooling process. Therefore, the transfer device 30 provided in the cooling chamber 5 does not need to have a large lifting stroke that can be moved up and down to the above-mentioned rising position, and the processed product on the fixed base 25 used in the transfer chamber 6. The transfer device 30 having a small lifting stroke for delivery can also be used in the cooling chamber 5.

  Next, an embodiment of the present invention will be described with reference to a second example shown in FIGS. The continuous vacuum carburizing furnace of this example uses the cooling chamber 7 shown in FIGS. 13 to 14 instead of the cooling chamber 5 in the continuous vacuum carburizing furnace 1 of the first example. Therefore, the illustration of the entire furnace is omitted, and the configuration of the cooling chamber 7 will be described. The cooling chamber 7 is moved up and down by a driving machine 96 provided on the upper portion of the cooling chamber 7 as a support device for the processed product W, instead of the frame 25 driven up and down by the frame lifting device 70 in the cooling chamber 5 of the first example. Since the driven gondola 90 is provided and the other configuration is the same as that of the cooling chamber 5, the same or corresponding parts as those in FIGS. 9 to 10 are denoted by the same reference numerals as those in FIGS. 9 to 10. Detailed description thereof will be omitted. In this example, since the gantry 25 is not used as described above, the notch 81b provided in the heat shield plate 81 of the heat shield device 80 in the first example may not be provided.

  13 to 14, reference numeral 90 denotes a gondola, which is provided with support members 92 each having an L-shaped cross section at the lower ends of two U-shaped frames 91, 91 that are arranged at intervals in the front-rear direction and open downward. The left and right end portions of the processed product W are fixed to each other, and left and right edge portions of the bottom surface of the processed product W are provided with support piece portions 93 and 93. Reference numeral 94 denotes an elevating drive device for the gondola 90. Each output shaft (elevating shaft) of a driving machine 96 composed of two electric screw jacks that are synchronously operated and attached to a support base 95 at the top of the furnace shell 7a. The upper ends of two suspension rods 97 connected to the center of the upper beam of each frame 91 and guided in a vertically movable manner through the through-hole of the furnace shell 7a are respectively connected. Further, in this example, two side heat shield plates 98 facing the left and right side surfaces of the processed product W supported on the support piece portion 93 of the gondola 90 are provided, and the lower edge portion thereof is the vertical piece portion of the support material 92. In addition, the front and rear edges are attached to the gondola 90 by attaching the front and rear edges to the inner side surface of the vertical member of each frame body 91, and the side heat shield plate 98 is made of a stainless steel plate having a surface treated with a bright surface. .

  Then, the gondola 90 is moved from the upper surface of the telescopic arm 31 of the transfer device 30 in the lowered state by the transfer device 30 provided at the lower part of the cooling chamber 7 (for example, from the upper surface of the telescopic arm 31 of the transfer device 30 in the lowered state). A lowering position in which the support piece 93 (the upper surface thereof) is located at a position about 1/2 of the ascending / descending stroke Y), and the same open / close shutter type heat shield device 80 as the first example provided in the cooling chamber 7. Of the gondola 90 by the elevating drive device 94 so as to be driven up and down between the raised position where the lower end surface of the gondola 90 is located above the upper end of the heat shield plate 81 (of the rectifying body portion 81a). The up / down stroke is set.

  In this cooling chamber 7, as in the cooling chamber 5 of the first example, the heat shield plate 81 and the heat insulating plate 86 of the heat shield device 80 are kept open when the processed product W is transferred, and the transfer device 30 described above. The processed product W extracted from the carburizing chamber 4 by raising / lowering and extending / shortening driving is transferred onto the support piece 93 of the gondola 90 in the lowered position, and then the gondola 90 is driven up to be held in the raised position. The hot plates 81 and 81 and the heat insulating plates 86 and 86 which are the same as the hot plates are driven close to each other to make the opening closed. After performing the cooling process of the processed product W in this state, after the cooling process, the heat shield plates 81 and 81 and the heat insulating plates 86 and 86 are driven apart to be opened, and the gondola 90 is driven down to the lowered position. Then, the processed product W on the support piece portion 93 of the gondola 90 is transferred onto an extraction table (not shown) outside the furnace by the transfer device 30, and the shortened transfer device 30 is accommodated in the cooling chamber 7. .

  In the continuous vacuum carburizing furnace in which the cooling chamber 7 having the above configuration is provided in the last stage instead of the cooling chamber 5 of the continuous vacuum carburizing furnace 1 of the first example, it is sequentially transported in the furnace as in the first example. A continuous vacuum carburizing process of the processed product W is performed, and the transfer of the processed product W into each processing chamber at this time is performed by a transfer device provided in the front chamber 2, the transfer chamber 6, and the cooling chamber 7 as in the first example. 30 respectively. The transfer device 30 provided in the cooling chamber 7 is accommodated in the cooling chamber 7 after the processing product W in the carburizing chamber 4 is transferred into the cooling chamber 7 as in the first example. Since the carburizing chamber 4 partitioned by 11d is subjected to the vacuum carburizing process of the processed product W, it is not exposed to the vacuum carburizing atmosphere in the carburizing chamber 4 and vacuum carburized with the processed product W. It can be used without any trouble for a long time without causing deterioration and malfunction due to vacuum carburization. Similarly to the first example, the transfer device 30 for extracting the processed product W from the carburizing chamber 4 is provided in the cooling chamber 7, and no transfer chamber is provided between the carburizing chamber 4 and the cooling chamber 7. Therefore, the overall length of the vacuum carburizing furnace can be short.

  As described above, the cooling process of the processed product W in the cooling chamber 7 is performed by moving the processed product W after the vacuum carburizing process onto the lowered gondola 90 by the transfer device 30 and then driving the gondola 90 upward. The heat shield plates 81 and 81 of the heat shield device 80 are driven in close proximity to each other, and the opening 83 is closed. As a result, the processed product W supported on the gondola 90 and the transfer device 30 in the lowered state are partitioned by the heat shield plates 81, 81, so that the radiant heat from the hot processed product W immediately after the transfer is generated. Reaching the transfer device 30 is prevented by the heat shield plates 81, 81, and the transfer device 30 can be used without any trouble for a long time without being heated to a high temperature.

  Also in this example, as in the first example, during the cooling process, the processed product W is substantially uniform as in the first example due to the upward deflection action of the cooling air by the rectifying member 81a provided on the heat shield plate 81. Heat insulating plates 86, 86 that are cooled and driven integrally with the heat shield plates 81, 81 close the opening 66 of the partition wall 61, and both the front and rear side portions of the processed product W and the front and rear sides of the cooling chamber 7. Since the wall plates 7b and 7c and the doors for opening and closing the openings provided in the wall plates are partitioned, it is possible to prevent the wall plates and the door portions from being excessively heated by the radiant heat from the processed product W. Is done. In the cooling chamber 7, the gondola 90 is positioned at the lowered position when the processed product W is delivered by the transfer device 30, and at the raised position that holds the processed product W above the heat shield plates 81, 81 during the cooling process. Therefore, the transfer device 30 provided in the cooling chamber 7 does not need to have a large lifting stroke that can be moved up and down to the above-mentioned rising position, and is a small lifting for delivery of processed products on the fixed base 25 used in the transfer chamber 6. The stroke transfer device 30 can also be used in the cooling chamber 7.

  In addition to this, in this example, the gondola 90 is driven up and down in a suspended state by a driving machine 96 (and an elevating drive device 94) provided in the upper part of the cooling chamber, so that the gantry elevating device 70 as in the first example is installed. Therefore, it is not necessary to secure a large space for the lower part of the cooling chamber, and the structure of the lower part of the cooling chamber 7 can be reduced in size and simplified and the furnace height of the entire vacuum carburizing furnace can be reduced. Further, the radiant heat from the left and right side surfaces of the high-temperature processed product W is shielded by the side heat shield plates 98 provided opposite to the left and right side surfaces of the processed product W supported by the gondola 90. Thus, overheating of the partition wall 61 and the support member 92 part of the gondola 90 located on both the left and right sides can be prevented.

  Next, an embodiment of the present invention will be described with reference to a third example shown in FIGS. The continuous vacuum carburizing furnace of this example is different from the first example in that the structure of the cooling chamber and the transfer chamber is provided between the cooling chamber and the carburizing chamber, but the other configuration is the same as the first example. The same or corresponding parts as those in the first example are denoted by the same reference numerals as those in the first example. In FIG. 15, 101 is a continuous vacuum carburizing furnace, 2 is a front chamber (charging chamber), 3 is a heating chamber, 4 is a carburizing chamber, 8 is a cooling chamber, and 6 is between the heating chamber 3 and the carburizing chamber 4. The provided transfer chamber 9 is a transfer chamber provided between the carburizing chamber 4 and the cooling chamber 8. Partition doors 11a to 11e are provided between the chambers, and the chambers (furnace shell portions) are integrally connected to each other, but have a structure that can be separated at the time of maintenance or the like. It has wheels at the bottom. Reference numeral 12 denotes an inlet for charging a processed product, and reference numeral 13 denotes an outlet for taking out. The doors 16 and 17 are opened and closed by air cylinder type opening and closing devices 14 and 15, respectively. Each of the partition doors 11a to 11e is driven to open and close by a horizontal cylinder type opening and closing device 18. Further, the processed product W which is the object of vacuum carburization processing in this furnace is schematically illustrated in the shape of a rectangular body in each figure, but this point is the same as the first example, and the specific support form of the processed product and The designated part on the bottom surface of the processed product W and the like are as described above in the first example.

  Each chamber from the front chamber 2 to the cooling chamber 8 is connected to a vacuum exhaust device (not shown), the carburizing chamber 4 is a carburizing gas supply source (not shown), and the cooling chamber 8 is an atmospheric gas (nitrogen gas) supply source (not shown). Are connected to each other. The heating chamber 3 and the carburizing chamber 4 are each provided with an electric heating heater (not shown) in a room surrounded by four heat insulating walls 21 and 22 provided in the furnace shell, and the cooling chamber 8 is provided in the furnace shell. A blower 24 that circulates a cooling atmosphere in a room surrounded by the partition wall 23 on four sides, and a cooler (not shown) provided in gas circulation paths formed on the left and right sides of the partition wall 23 are provided. The heating chamber 3, the carburizing chamber 4, and the cooling chamber 8 are each provided with a support 25 for supporting the processed product W fixed to the furnace shell. As shown in FIG. 2, the gantry 25 has a U-shaped frame body in which columns 25 b are fixed to both front and rear ends of a support beam 25 a extending in the front-rear direction for supporting the left and right side edges of the bottom surface of the processed product W. The two telescopic arms 31 (specifically, the upper arm 34 in detail) of the transfer device 30 to be described later can enter the space portion.

  Reference numeral 30 denotes a transfer device for transferring the processed product W, which is also provided in the transfer chamber 6, the transfer chamber 9, and the front chamber 2 in this example. The transfer device 30 has a configuration shown in FIGS. These drawings show the transfer device 30 provided in the transfer chamber 6, but those provided in the transfer chamber 9 and the front chamber 2 also have the same configuration. Since the transfer device 30 has the same configuration as that of the first example and the operation of each part is also as described above, detailed description thereof is omitted.

  With respect to the transfer device 30 provided in each chamber described above, the gantry 25 provided in each chamber and each upper surface (processed product W support surface) of the charging table provided outside the furnace (not shown) are in the lowered position described above. It is at an intermediate position between the position of the upper surface of the transfer device 30 (the upper surface of the upper arm 34) and the ascending position that has been raised by the ascent / descent stroke Y. For example, in order to transfer the processed product W from the heating chamber 3 into the carburizing chamber 4 by the transfer device 30 in the transfer chamber 6, the telescopic arm 31 held at the lowered position is moved forward with each partition door opened. When the upper arm 34 reaches the lower side of the processed product W on the gantry 25 of the heating chamber 3 by extending, the elevating frame 36 (and thus the telescopic arm 31) is driven upward to bring the processed product W onto the upper arm 34. Then, the telescopic arm 31 is pulled back to the shortened state and further extended backward, and when the processed product W reaches the frame 25 of the carburizing chamber 4, the lifting frame 36 (telescopic arm 31) is driven downward. When the processed product W is transferred onto the gantry 25 and the telescopic arm 31 is returned to the shortened state, the transfer is completed. Also with the transfer device 30 provided in another chamber, the processed product W can be transferred by the same lifting / lowering / extending operation.

  In order to perform the vacuum carburizing process of the processed product W by the continuous vacuum carburizing furnace 101 provided with each apparatus of the above configuration, the processed product W on the delivery table (not shown) is transferred into the front chamber 2 and waited. It is transferred to the heating chamber 3 for heat treatment, the heated processed product W is transferred into the carburizing chamber 4 through the transfer chamber 6 and vacuum carburized, and then the processed product W after the carburizing process is transferred through the transfer chamber 9. After being transferred into the cooling chamber 8 and cooled by nitrogen gas circulation under normal pressure, a process of sending it out of the furnace by means of an extraction device such as a fork (not shown) is sequentially applied to a plurality of processed products W transported in the furnace. Do it continuously. At this time, in addition to the indoor pressure adjustment at the time of processing in each processing chamber, when the processed product W is transferred, the pressure adjustment such as the pressure in the two adjacent chambers is set to the same level through the partition door, the progress of the processing step Appropriately depending on the situation.

  Transfer of the processed product W into the heating chamber 3, transfer of the processed product W in the heating chamber 3 into the carburizing chamber 4, and transfer of the processed product W in the carburizing chamber 4 into the cooling chamber 8 are as follows: Each of them is performed by using the transfer device 30 and the above-described lifting and lowering and extension / reduction driving. And the transfer apparatus 30 after these transfer processes is accommodated in the front chamber 2, the transfer chamber 6, and the transfer chamber 9, respectively, with the telescopic arm 31 in a shortened state, and is separated from these chambers by partition doors 11a to 11d. Thus, the heat treatment of the processed product W in the heating chamber 3 and the vacuum carburizing treatment of the processed product W in the carburizing chamber 4 are performed.

  Thus, both the transfer device 30 provided in the transfer chamber 6 and the transfer device 30 provided in the transfer chamber 9 are exposed to the vacuum carburizing atmosphere in the carburizing chamber 4 and are vacuum carburized along with the processed product W. Therefore, these transfer devices can be used without any trouble over a long period of time without causing deterioration or malfunction due to vacuum carburization.

  The present invention is not limited to the above examples. For example, the heat shield plate 81, the heat insulating plate 86, the side heat shield plate 98, etc. may be made of materials other than those described above. It is also possible to use a flat plate without the fluid part 81a, or to omit the heat insulating plate 86 and the side heat shield plate 98. The specific configurations of the telescopic arm 31 such as the telescopic drive mechanism and the lifting mechanism, the gantry lifting device 70, and the lifting drive device 94 of the gondola 90 in the transfer device 30 may be other than those described above. In each of the above examples, the front chamber 2 is also provided with a transfer device 30 having a telescopic arm as in the other chambers, but the processed product is moved from the outside of the furnace to the front chamber 2 and from the front chamber 2 to the heating chamber 3. Other types of transfer devices may be used as the transfer device.

1 is a schematic longitudinal sectional view of a continuous vacuum carburizing furnace showing a first example of an embodiment of the present invention. It is the sectional view on the AA line of FIG.1 and FIG.15. It is a longitudinal cross-sectional view of the transfer apparatus in the continuous vacuum carburizing furnace of FIG. FIG. 4 is a cross-sectional view (plan view) taken along line BB in FIG. 3. FIG. 5 is a partial enlarged cross-sectional view taken along the line CC of FIG. 4. It is the DD sectional view taken on the line of FIG. It is the EE sectional view taken on the line of FIG. It is typical explanatory drawing which shows the drive mechanism of the transfer apparatus of FIG. It is a longitudinal cross-sectional view (GG sectional view taken on the line in FIG. 10) of the cooling chamber in the continuous vacuum carburizing furnace of FIG. FIG. 10 is a sectional view taken along line FF in FIG. 9. It is the schematic sectional drawing (a) which shows the open state of the heat shield in FIG. 10, and HH sectional view taken on the line (b). It is the schematic sectional drawing (a) and II sectional view taken on the line (b) which show the closed state of the heat shield in FIG. It is a longitudinal cross-sectional view of the cooling chamber which shows the 2nd example of embodiment of this invention. It is the JJ sectional view taken on the line of FIG. It is a schematic longitudinal cross-sectional view of the continuous vacuum carburizing furnace which shows the 3rd example of embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Continuous vacuum carburizing furnace, 2 ... Front chamber, 3 ... Heating chamber, 4 ... Carburizing chamber, 5 ... Cooling chamber, 6 ... Transfer chamber, 7 ... Cooling chamber, 8 ... Cooling chamber, 9 ... Transfer chamber, 11a-11e ... partition door, 25 ... gantry, 30 ... transfer device, 31 ... telescopic arm, 36 ... elevating frame, 40 ... rotary drive, 52 ... rotary drive, 56 ... drive chain, 59a ... chain, 59b ... chain, 61 ... Bulkhead, 63 ... Blower, 66 ... Opening, 70 ... Stand lift, 71 ... Raft, 76 ... Hydraulic cylinder, 80 ... Heat shield, 81 ... Heat shield, 81a ... Rectifier, 82 ... Fixed plate, DESCRIPTION OF SYMBOLS 83 ... Opening part, 85 ... Drive machine, 86 ... Heat insulation board, 90 ... Gondola, 91 ... Frame, 93 ... Supporting piece part, 94 ... Lifting drive device, 96 ... Drive machine, 98 ... Side part heat shield board, 101 ... continuous vacuum carburizing furnace.

Claims (7)

In a continuous vacuum carburizing furnace having a front chamber, a heating chamber, a carburizing chamber and a cooling chamber arranged in series,
A transfer chamber is provided between the heating chamber and the carburizing chamber and between the carburizing chamber and the cooling chamber via partition doors, respectively, and each of the heating chamber, the carburizing chamber, and the cooling chamber is used for supporting a processed product. The base of
A transfer device having a telescopic arm that is expanded and contracted in both front and rear directions on a base member that is driven up and down is provided in each of the transfer chambers. By the transfer device, a processing chamber on the front side of each of the transfer chambers is provided. A continuous vacuum carburizing furnace characterized in that the processed product is transferred into a processing chamber on the rear stage side. In a continuous vacuum carburizing furnace having a front chamber, a heating chamber, a carburizing chamber and a cooling chamber arranged in series,
A transfer chamber is provided between the heating chamber and the carburizing chamber via a partition door, and a support for supporting a processed product is provided in each of the heating chamber, the carburizing chamber, and the cooling chamber,
A transfer device having a telescopic arm that is extended and retracted in both the front and rear directions on a base member that is driven up and down is provided in each of the transfer chamber and the cooling chamber, and the processed product in the heating chamber is provided by the transfer device. The carburizing chamber, and the processed products in the carburizing chamber are transferred to the cooling chamber, respectively.
In the cooling chamber, a pair of heat shield plates arranged in parallel on a horizontal plane located on the upper side of the transfer device in a lowered state and extending in the front-rear direction guided to be movable in the left-right direction, and a lower surface of the heat shield plate And a fixed plate fixed to the furnace body with an opening extending in the front-rear direction, and a drive unit that closes and opens the opening by driving the heat shield plates close to and away from each other. An open / close shutter-type heat shield device is provided, and the shield member in a state where the opening portion is closed is provided between the processed product transferred to the cooling chamber and supported on the gantry and the transfer device in the lowered state. A continuous vacuum carburizing furnace characterized by being partitioned by a hot plate.   A support for supporting a processed product provided in the cooling chamber is configured such that a lowered position, which is a delivery position of the processed product by the transfer device, and a support beam portion extending in the front-rear direction of the mount are above the upper end of the heat shield plate. The continuous vacuum carburizing furnace according to claim 2, further comprising a gantry lifting device that moves up and down between the elevated positions. In a continuous vacuum carburizing furnace having a front chamber, a heating chamber, a carburizing chamber and a cooling chamber arranged in series,
A transfer chamber is provided between the heating chamber and the carburizing chamber through a partition door, and a support for supporting a processed product is provided in each of the heating chamber and the carburizing chamber,
A transfer device having a telescopic arm that is driven to extend and retract in both the front and rear directions on the base member that is driven up and down is provided in each of the transfer chamber and the cooling chamber, and a processing product support device is provided in the cooling chamber. A support piece for supporting the left and right side edges of the product bottom is provided between a lowered position where the support piece is located at the delivery position of the processed product by the transfer device and a raised position where a predetermined stroke is raised from the lowered position. A gondola that is driven up and down by a drive unit provided in the upper part of the cooling chamber is provided, and the processing product in the heating chamber is transferred to the carburizing chamber and the processing product in the carburizing chamber is transferred to the cooling chamber by the transfer device, respectively. As well as
In the cooling chamber, a pair of heat shield plates arranged in parallel on a horizontal plane located on the upper side of the transfer device in a lowered state and extending in the front-rear direction guided to be movable in the left-right direction, and a lower surface of the heat shield plate And a fixed plate fixed to the furnace body with an opening extending in the front-rear direction, and a drive unit that closes and opens the opening by driving the heat shield plates close to and away from each other. An opening / closing shutter type heat shield device is provided, and the opening is closed between the processed product that is transferred to the cooling chamber and supported by the gondola in the raised position and the transfer device in the lowered state. A continuous vacuum carburizing furnace characterized by being partitioned by the heat shield plate in a state.   The continuous vacuum carburizing furnace according to claim 4, wherein side heat shield plates arranged to face the left and right side surfaces of the processed product supported by the gondola are attached to the left and right side surfaces of the gondola. A heat insulating plate extending upward is fixed to both front and rear ends of the heat shield plate,
When the heat shield plate is closed, the heat insulating plate moved together with the heat shield plate to be in a closed state, between the front and rear side surfaces of the processed product accommodated in the cooling chamber and the front and rear wall plates of the cooling chamber. The continuous vacuum carburizing furnace according to any one of claims 2 to 5, wherein a heat insulating wall for partitioning is formed.   The rectifier body is provided on the upper surface side of the heat shield plate, the surface of which is curved upward toward the front end side of the heat shield plate, and deflects the cooling air upward when the heat shield plate is closed. The continuous vacuum carburizing furnace according to any one of claims 2 to 6.

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