JP2007139299A - Inlet door of heat treating chamber for vacuum carburization - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simple and inexpensively structured inlet door of a heat treating chamber for vacuum carburization which only requires a door elevating/lowering drive means as a door drive means and does not require any other drive means. <P>SOLUTION: The inlet door has an intermediate plate 12 having seal members 9, 9 arranged on both sides for closing an opening portion 6 on the front face of a cooling chamber 2, the heat treating chamber, in which a work piece 5 goes in, and two doors which are an outside inlet door 1a and an inside inlet door 1b sandwiching the intermediate plate 12 and arranged to contact both sides of the seal members 9, 9. The outside inlet door 1a and the inside inlet door 1b are guided by linear bearings 14, 14 and can be elevated and lowered by a cylinder 15 via triangular levers 16, 16. The intermediate plate 12 has a communication hole 23, and when the outside inlet door 1a and the inside inlet door 1b are lowered and in a state of blocking an intermediate plate inner peripheral space 24, the inside of the intermediate plate inner peripheral space 24 is exhausted via the communication hole 23 of the intermediate plate 12, and the outside inlet door 1a and the inside entrance door 1b are pressed against the intermediate plate 12 by atmospheric pressure on the outside of the cooling chamber and inner pressure inside the intermediate plate inner peripheral space 24. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an entrance door of a heat treatment chamber for vacuum carburization, which has an entrance door, a cooling chamber, and a heating chamber, and the cooling chamber and the heating chamber are partitioned by an intermediate door.

Conventionally, heat treatment furnaces including a vacuum carburizing furnace include a vacuum processing type and a vacuum furnace that cools the atmosphere with nitrogen gas during cooling. In a vacuum carburizing furnace, it is necessary to seal the outside of the furnace and the inside of the furnace in order to exhaust the air in the furnace and reduce the pressure close to vacuum. For this reason, when the air in the furnace is exhausted, the entrance door that becomes the work entry port needs some means for sealing the door and the furnace body so that the air does not enter the furnace from outside the furnace. In order to maintain the internal pressure of the cooling chamber, a heat treatment furnace that cools the atmosphere requires means for pressing the cooling chamber door against the cooling chamber. Examples of the entrance door of the heat treatment chamber for vacuum carburization having an entrance door, a cooling chamber, and a heating chamber, and partitioning the cooling chamber and the heating chamber by an intermediate door, are described in Patent Documents 1, 2, and 3, for example. . In the example of the pressure furnace of Patent Document 1, a method is described in which the door is clamped by a simple clamping device. The structure for pressing the door in the furnace against the surface to be sealed is described, and in Patent Document 3, a pressurizing chamber is provided so as to surround the door of the adjacent opening of the adjacent heat treatment furnace, and the upper and lower doors of the adjacent opening are formed. A door called a gate valve is installed in the pressurizing chamber, and a pressure difference is applied between the inside of the furnace and the pressurizing chamber to seal the inside of the furnace.
Public Utility Sho 63-32299 Utility Model Gazette No. 2556214 Japanese Patent Publication No. 8-26394

  However, in the thing of patent document 1, it is necessary to provide many clamping devices around the door, and it is necessary to clamp each manually or with a driving device, and the cost of the clamping device is high. It was more expensive to clamp with. The thing of patent document 2 requires the door clamp drive means in addition to the door ascending / descending drive means, and also requires a cylinder outside the furnace for pressing the door, a toggle clamp, a cam, etc. Requires a lot of space. In Patent Document 3, a pressurizing chamber is required in addition to the door ascending / descending drive means. Depending on the size of the door, an inert gas such as nitrogen is necessary in the pressurizing chamber, which is extremely expensive. However, it is common to open and close the door up and down from the minimum installation space, but it was necessary to install a separate brake brake device due to the weight of the door. In Patent Documents 1, 2, and 3, all the door driving means require various devices in addition to the door raising / lowering driving means, and there is a problem that the cost of the door clamping device is high. .

  The object of the present invention is to provide an entrance door for a heat treatment chamber for vacuum carburizing, which has a simple and inexpensive structure, and only requires a drive means for raising and lowering the door as drive means for the door, and no other drive means. It is to provide.

For this reason, the present invention has an inlet door, a cooling chamber and a heating chamber, and the cooling chamber which is a heat treatment chamber into which a workpiece enters in an inlet door of a heat treatment chamber of a vacuum carburizing furnace in which the cooling chamber and the heating chamber are partitioned by an intermediate door. An intermediate plate that is fixed to the cooling chamber furnace body so as to close the opening on the front surface and that has sealing members disposed on both sides at positions corresponding to the periphery of the opening, and sandwiches the intermediate plate and contacts both surfaces of the sealing member A linear motion that is a pair of longitudinal guides that are vertically fixed to both sides of the intermediate plate. The outer entrance door and the inner entrance door are guided by bearings so that they can be moved up and down, and each of the outer entrance door and the inner entrance door has a pair of lateral U-shaped guides fixed laterally at the lower ends thereof, and the cooling chamber wall and the intermediate plate are The rotating shaft that penetrates back and forth is rotatably supported, and the rotation Fixes the intermediate side of a pair of triangular levers on both sides of the intermediate plate, and the first side of the other side of the pair of triangular levers is U of a pair of lateral U-shaped guides via a pair of roller shafts. A pair of rollers is movable in the groove in a lateral direction and supported in a fixed position in the front-rear direction, and the second side of the other side of the pair of triangular levers is fixed to the intermediate plate via a link and a link shaft. When the drive arm of the door drive device is rotatably supported by the drive arm of the door drive device, the first side of the other side of the pair of triangular levers is the lateral direction with the rotation axis as a fulcrum. When a pair of rollers is moved laterally in the U-shaped groove of the U-shaped guide to push up the outer entrance door and the inner entrance door, and the drive arm of the door driving device is driven upward, the lateral U A pair of triangular levers in the U-shaped groove of the letter-shaped guide First side edge is by lateral movement of the roller in the opposite direction to push down the respective outer inlet door and an inner inlet door
The intermediate plate has a communication hole that opens from the outer peripheral edge of the intermediate plate to the inner peripheral edge of the intermediate plate,
When the outer inlet door and the inner inlet door are lowered to shield the intermediate plate inner space, the intermediate plate inner space is exhausted through the communication hole of the intermediate plate, and the outside of the cooling chamber The problem described above by providing an inlet door of a heat treatment chamber of a vacuum carburizing heat treatment chamber, wherein the outer entrance door and the inner entrance door are pressed against the intermediate plate by an atmospheric pressure and an internal pressure of the cooling chamber. Solved.

  In the present invention, when the drive arm of the door drive device is driven downward, the first side of the other side of the pair of triangular levers has a pair of rollers in the U-shaped groove of the lateral U-shaped guide with the rotation axis as a fulcrum. When the outer entrance door and the inner entrance door are pushed up by moving in the lateral direction and the drive arm of the door driving device is driven upward, the other sides of the pair of triangular levers are similarly inserted into the U-shaped groove of the lateral U-shaped guide. The first side of the intermediate plate is configured to push the outer entrance door and the inner entrance door downward by moving the roller in the opposite direction, and the intermediate plate has a communication hole that opens from the outer peripheral edge of the intermediate plate to the inner peripheral edge of the intermediate plate. When the outer entrance door and the inner entrance door are lowered to shield the inner peripheral space of the intermediate plate, the inner peripheral space of the intermediate plate is exhausted through the communication hole of the intermediate plate, and the atmospheric pressure outside the cooling chamber is reduced. Press the outer and inner inlet doors against the intermediate plate with the internal pressure of the cooling chamber. Therefore, the door drive means is only the door up / down drive means, and the other drive means is not particularly necessary, and the vacuum carburizing heat treatment chamber entrance door has a simple and inexpensive structure. became.

Preferably, the first side of the other side of the pair of triangular levers is stopped at a position reaching a lowered position beyond the rising end dead center with the rotation axis as a fulcrum. Eliminates the need for a separate anti-fall brake device.
More preferably, the linear motion bearing which is a longitudinal guide is arranged with a gap with respect to both surfaces of the intermediate plate by the mounting device of the linear motion bearing, and in the inner peripheral space of the intermediate plate by a spring built in the mounting device of the linear motion bearing. When the exhaust was not performed, it was slightly lifted from both sides of the intermediate plate, and when the outer entrance door and the inner entrance door were raised and lowered, friction with the sealing members disposed on both sides of the intermediate plate was eliminated.

  An example of the best mode for carrying out the present invention will be described with reference to FIGS. 1 is a schematic side sectional view of a vacuum carburizing entrance door, a cooling chamber as a heat treatment chamber, an intermediate door, and a heating chamber according to an embodiment of the present invention, and FIG. 2 is a schematic plan sectional view along the line AA in FIG. 3 is a left side view of FIG. 1, and is a front view of a cooling chamber and an entrance door, which are heat treatment chambers. FIG. 4 is a diagram showing details of driving means for raising / lowering the outer entrance door and the inner entrance door of FIG. FIG. 5 is an enlarged view of the main part shown in a state where the first side of the other side of the pair of triangular levers in FIG. 4 is stopped at a position where it reaches a lowered position beyond the dead end of the rising end with the rotation axis as a fulcrum. FIG. 6A is an enlarged view of a main part near the line BB in FIG. 4, and FIG. 6B is an enlarged cross-sectional view of the main part along the line BB in FIG. In (c), the outer entrance door and the inner entrance door are lifted from both sides of the intermediate plate by a spring built in the linear bearing fixture from the state of (b). Showing a state in which there. FIG. 7 is a partial enlarged cross-sectional view showing a CC section of FIG. 4 and shows details of the driving mechanism for raising and lowering the outer entrance door and the inner entrance door.

  The inlet door of the vacuum carburizing heat treatment chamber of the embodiment of the present invention has an inlet door 1, a cooling chamber 2, and a heating chamber 3, and the heat treatment of the vacuum carburizing furnace in which the cooling chamber 2 and the heating chamber 3 are partitioned by an intermediate door 4. At the entrance door 1 of the chamber, the sealing members 9 and 9 are fixed to the cooling chamber furnace body so as to close the opening 6 on the front surface of the cooling chamber 2 which is a heat treatment chamber into which the workpiece 5 enters and correspond to the periphery of the opening 6. (FIGS. 5 to 7) an intermediate plate 12 arranged on both sides, and two outer entrance doors 1a and 1b arranged so that the intermediate plate 12 is sandwiched and can be brought into contact with both sides of the sealing members 9, 9; The outer entrance door 1a and the inner entrance door 1b are guided by linear motion bearings 14 and 14, which are a pair of longitudinal guides that are vertically fixed on both surfaces of the intermediate plate 12, and can be moved up and down. The door 1a and the inner entrance door 1b have a pair of lateral U-shaped guides 35a and 35b fixed laterally at the lower ends thereof, The plate 12 rotatably supports a rotary shaft 20 penetrating in the front-rear direction. The rotary shaft 20 fixes the intermediate sides 16a and 16a of the pair of triangular levers 16 and 16 to both surfaces of the intermediate plate 12, and a pair of triangular levers. The first sides 16b, 16b of the other sides of 16, 16, 16 move the pair of rollers 36, 36 laterally in the U-shaped grooves of the pair of lateral U-shaped guides 35a, 35b via the pair of roller shafts 36a, 36b. The front and rear direction is supported at a fixed position, and the second side 16c, 16c of the other side of the pair of triangular levers 16, 16 is fixed to the intermediate plate 12 via a link 17a and a link shaft 17b. When the drive arm 19 of the door drive device 15 is driven upward by a cylinder rod 19 which is a drive arm of the cylinder 15 which is a device, the one end 16b, 16b of each of the pair of triangular levers 16, 16 is driven. The pair of rollers 36 and 36 are moved laterally in the U-shaped grooves of the lateral U-shaped guides 35a and 35b with the rotary shaft 20 as a fulcrum, and the outer entrance doors 1a and When the inner entrance door 1b is pushed up and the drive arm 19 of the door drive unit 15 is driven downward, the pair of rollers 36 and 36 are laterally reversed in the U-shaped grooves of the horizontal U-shaped guides 35a and 35b. The outer entrance door 1a and the inner entrance door 1b are pushed down by being moved. The intermediate plate 12 has a communication hole 23 that opens from the outer peripheral edge 21 of the intermediate plate to the inner peripheral edge 22 of the intermediate plate so that the outer inlet door 1a and the inner inlet door 1b are lowered to shield the inner peripheral space 24 of the intermediate plate. When this happens, the inside of the intermediate plate inner space 24 is exhausted through the communication hole 23 of the intermediate plate 12, and the outer inlet door 1a and the inner inlet door 1b are connected to the intermediate plate by the atmospheric pressure outside the cooling chamber and the internal pressure inside the cooling chamber 2. It is intended to be pressed against 12. That is, the atmospheric pressure outside the cooling chamber is about 100 KPa, the internal pressure inside the cooling chamber 2 is about 80 KPa, and the internal pressure inside the intermediate plate inner space 24 is exhausted to about 1 KPa, so the outer inlet door 1a and the inner inlet door 1b are extremely It is pressed against the intermediate plate 12 with a strong force.

  In the cooling chamber 2, there are an in-furnace transfer device 27 and an elevating device 28 for immersing the work 5 in an oil tank 29 (FIG. 1). Between the cooling chamber 2 and the heating chamber 3, there is an intermediate door 4 driven by an endless chain 30 that vacuum seals the heating chamber 3. A heat insulating material 32 supported by a heat insulating frame (not shown) is arranged in the heating chamber 3, the rear portion of the heating chamber is blocked from the outside by a flange 33, and the heat insulating material 32 supported by the heat insulating frame can be taken out by removing the flange 33. it can. The outer entrance door 1a and the inner entrance door 1b are the positions where the first sides 16b, 16b of the other sides of the pair of triangular levers 16, 16 reach the lowered position beyond the rising end dead center with the rotary shaft 20 as a fulcrum. It was made to stop (FIG. 5), and it was not necessary to separately install a fall prevention brake device due to the weight of the door in the upper and lower doors. The outer entrance door 1a and the inner entrance door 1b are guided by the linear motion bearings 14 and 14, respectively, in FIG. Linear guides 14 and 14 that are longitudinal guides are arranged with clearances 25 and 25 on both sides of intermediate plate 12 by fixtures 13 of linear motion bearings 14 and 14, and are incorporated in fixtures 13 of linear motion bearings 14 and 14. When the inside of the intermediate plate inner space 24 is not exhausted by the springs 26 and 26, it is slightly lifted from both sides of the intermediate plate 12, and is arranged on both sides of the intermediate plate 12 when the outer entrance door and the inner entrance door are raised and lowered. The rubbing with the sealed members 9 and 9 was eliminated. FIG. 5C shows a state in which the outer entrance door 1a and the inner entrance door 1b are lifted from the intermediate plate 12 with a small clearance 25, 25 by the springs 26, 26.

  In the present invention, when the drive arm of the door drive device is driven downward, the first side of the other side of the pair of triangular levers has a pair of rollers in the U-shaped groove of the lateral U-shaped guide with the rotation axis as a fulcrum. When the outer entrance door and the inner entrance door are pushed up by moving in the lateral direction and the drive arm of the door driving device is driven upward, the other sides of the pair of triangular levers are similarly inserted into the U-shaped groove of the lateral U-shaped guide. The first side of the intermediate plate is configured to push the outer entrance door and the inner entrance door downward by moving the roller in the opposite direction, and the intermediate plate has a communication hole that opens from the outer peripheral edge of the intermediate plate to the inner peripheral edge of the intermediate plate. When the outer entrance door and the inner entrance door are lowered to shield the inner peripheral space of the intermediate plate, the inner peripheral space of the intermediate plate is exhausted through the communication hole of the intermediate plate, and the atmospheric pressure outside the cooling chamber is reduced. Press the outer and inner inlet doors against the intermediate plate with the internal pressure of the cooling chamber. Therefore, the door drive means is only the door up / down drive means, and the other drive means is not particularly necessary, and the vacuum carburizing heat treatment chamber entrance door has a simple and inexpensive structure. became.

Preferably, the first side of the other side of the pair of triangular levers is stopped at a position reaching a lowered position beyond the rising end dead center with the rotation axis as a fulcrum. Eliminates the need for a separate anti-fall brake device.
More preferably, the linear motion bearing which is a longitudinal guide is arranged with a gap with respect to both surfaces of the intermediate plate by the mounting device of the linear motion bearing, and in the inner peripheral space of the intermediate plate by a spring built in the mounting device of the linear motion bearing. When the exhaust was not performed, it was slightly lifted from both sides of the intermediate plate, and when the outer entrance door and the inner entrance door were raised and lowered, friction with the sealing members disposed on both sides of the intermediate plate was eliminated.

  The inlet door of the heat treatment chamber of the vacuum carburizing furnace according to the embodiment of the present invention has been described as the inlet door of the cooling chamber that is the heat treatment chamber of the vacuum carburizing furnace. The present invention can also be applied to the entrance door of a heat treatment chamber including a carry-in chamber and a heating chamber of a vacuum carburizing furnace, and the present invention is applicable to other heat treatments including a carry-in chamber and a heating chamber of a vacuum carburization furnace. Including the entrance door of the room.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic side cross-sectional view of a vacuum carburizing entrance door, a cooling chamber that is a heat treatment chamber, an intermediate door, and a heating chamber according to an embodiment of the present invention. FIG. 2 is a schematic plan sectional view taken along line AA in FIG. 1. The front view of the cooling chamber which is a heat processing chamber, and an entrance door in the left view of FIG. FIG. 4 is a detailed enlarged view of a main part of an ascending / descending drive means for the outer entrance door and the inner entrance door of FIG. The principal part enlarged surface shown in the state which stopped in the position where the 1st edge | side of the other edge | side of a pair of triangular lever of FIG. 4A is an enlarged view of a main portion near the line BB in FIG. 4, FIG. 4B is an enlarged cross-sectional view of the main portion along the line BB in FIG. 4 on the lower surface of FIG. The state where the outer entrance door and the inner entrance door are lifted from both surfaces of the intermediate plate with a slight clearance by the spring built in the fixture of the linear motion bearing from the state of (b). FIG. 6 is a partial enlarged cross-sectional view showing a cross section taken along the line C-C in FIG. 4, showing details of the outer entrance door and the ascending / descending drive means for the inner entrance door.

Explanation of symbols

1: entrance door, 1a: outside entrance door, 1b: inside entrance door, 2: cooling chamber (heat treatment chamber), 3: heating chamber, 4: intermediate door, 5: workpiece, 6: opening, 9: seal member, 12: Intermediate plate, 13: Mounting bracket for linear motion bearing, 14: Linear motion bearing (longitudinal guide), 15: Cylinder (drive means), 16, 16: Triangular lever, 16a, 16a: Middle of triangular lever Side, 16b, 16b: First side of the other side of the triangular lever,
16c, 16c: second side of the other side of the triangular lever, 14: linear motion bearing (vertical guide), 20: rotating shaft, 21: outer peripheral edge of the intermediate plate, 22: inner peripheral edge of the intermediate plate, 23: communication hole, 24: Inner plate inner space,
35a, 35b: U-shaped guide in the horizontal direction, 36, 36: Roller, 50: Cooling chamber wall

Claims (3)

An entrance door of a heat treatment chamber of a vacuum carburizing furnace that has an entrance door, a cooling chamber, and a heating chamber, and the cooling chamber and the heating chamber are partitioned by an intermediate door. An intermediate plate which is fixed to the cooling chamber furnace body so as to be closed and has a sealing member disposed on both sides at a position corresponding to the periphery of the opening, and 2 which is disposed so as to be able to sandwich the intermediate plate and to be in contact with both surfaces of the sealing member A plurality of outer entrance doors and inner entrance doors, and the outer entrance doors and the inner entrance doors are guided by linear motion bearings that are a pair of longitudinal guides that are vertically fixed to both surfaces of the intermediate plate. Each of the outer entrance doors and the inner entrance doors has a pair of lateral U-shaped guides fixed laterally at the lower ends thereof, and the cooling chamber wall and the intermediate plate rotate forward and backward. The rotation shaft is supported by both of the intermediate plates. The middle side of the pair of triangular levers is fixed to the first side of the pair of triangular levers, and the pair of rollers is inserted into the U-shaped grooves of the pair of lateral U-shaped guides via the pair of roller shafts. The drive arm of the door drive device is supported at a fixed position in the front-rear direction so that it can move laterally, and the second side of the other side of the pair of triangular levers is fixed to the intermediate plate via a link and a link shaft When the drive arm of the door driving device is driven downward, the first side of the other side of the pair of triangular levers is U of the lateral U-shaped guide with the rotation axis as a fulcrum. When a pair of rollers are moved laterally in the groove to push up the outer entrance door and the inner entrance door, and the drive arm of the door driving device is driven upward, the U-shape of the lateral U-shaped guide is similarly applied. The first side of the other side of the pair of triangular levers in the groove is low. The in the opposite direction to lateral movement is to push down the respective outer inlet door and an inner inlet door
The intermediate plate has a communication hole that opens from the outer peripheral edge of the intermediate plate to the inner peripheral edge of the intermediate plate,
When the outer inlet door and the inner inlet door are lowered to shield the intermediate plate inner space, the intermediate plate inner space is exhausted through the communication hole of the intermediate plate, and the outside of the cooling chamber An inlet door of a heat treatment chamber of a vacuum carburizing heat treatment chamber, wherein the outer entrance door and the inner entrance door are pressed against the intermediate plate by an atmospheric pressure and an internal pressure in the cooling chamber.   The first side of the other side of the pair of triangular levers is configured to stop at a position that reaches a lowered position beyond the rising end dead center with the rotation shaft as a fulcrum. The entrance door of the vacuum carburizing heat treatment room.   A linear motion bearing as the longitudinal guide is disposed with a gap with respect to both surfaces of the intermediate plate by a fixture of the linear motion bearing, and in the inner peripheral space of the intermediate plate by a spring built in the fixture of the linear motion bearing. The entrance door of the heat treatment chamber for vacuum carburizing according to claim 1 or 2, wherein when not exhausting, the air is slightly raised above both surfaces of the intermediate plate.

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