JP6471114B2 - Transport heating device - Google Patents

Description

  The present invention relates to a conveyance heating apparatus that can be applied to, for example, a reflow apparatus that performs reflow of a printed circuit board.

  A reflow apparatus is used in which a solder composition is supplied in advance to an electronic component or a printed circuit board, and the board is transported in a reflow furnace by a transport conveyor (see, for example, Patent Document 1). The reflow apparatus includes a transport conveyor for transporting a substrate and a reflow furnace main body to which an object to be heated, such as a printed circuit board, is supplied by the transport conveyor. For example, the reflow furnace is divided into a plurality of zones along a transfer path from a carry-in port to a carry-out port, and the plurality of zones are arranged in-line. The plurality of zones have roles such as a heating zone and a cooling zone depending on their functions.

  The reflow furnace body has an upper furnace body and a lower furnace body. For example, hot air is blown from the upper furnace body to the substrate, and hot air is blown from the lower furnace body to the substrate, so that the solder in the solder composition is melted and the printed circuit board electrodes and electronic components are Soldered. In the reflow apparatus, desired soldering is performed by controlling the temperature during heating according to a desired temperature profile.

  In such a reflow apparatus, in order to perform maintenance work such as removal of flux adhered to the inside, conventionally, the upper furnace body and the hood (case) can be opened with a one-side hinge structure (see, for example, Patent Document 2). . An operator opened the upper furnace body and the hood and performed maintenance work on the reflow apparatus from one side.

JP 2013-027931 A JP 2014-155961 A

  In the conventional configuration, access can be made only from one side, so it has been troublesome to perform maintenance work on the location on the back side. In particular, in the case of a reflow device having a dual transport configuration in which two transport conveyors are arranged in parallel, it is very troublesome to perform maintenance work on the rear transport conveyor. Since the thing of patent document 2 has provided the hinge on both sides, the maintenance operation | work can be made easy by changing the open side for an operation | work. However, when changing the opening side, it is necessary to close the upper furnace body and the hood once and then open the opposite side again, which is inferior in workability, and the dual transport reflow device provided with two transport conveyors. There was a problem that even if the technology was applied, maintenance could not be performed at the same time.

  Accordingly, an object of the present invention is to provide a transport heating apparatus that can perform maintenance work more easily than conventional ones and can improve workability.

The present invention includes a transport device that transports a heated object;
Provided above the transport device, an upper furnace body for heating materials,
A plurality of lifting mechanisms for translating the upper furnace body in the vertical direction;
A hood that forms a part of a casing that houses the upper furnace body and the transfer device, and is translated in the vertical direction together with the upper furnace body ;
A single drive means and a rotation transmission mechanism provided between a plurality of lifting mechanisms ,
In the state where the upper furnace body and the hood are raised by the elevating mechanism, an opening is formed below each of the upper furnace body and the hood .

  According to at least one embodiment, the openings can be formed on both sides by translating the furnace body and the hood upward. Therefore, the maintenance work becomes easier as compared with the conventional configuration in which the furnace body and the hood are rotated by the hinge. Note that the effects described here are not necessarily limited, and may be any effects described in the present disclosure. In addition, the contents of the present disclosure are not construed as being limited by the exemplified effects in the following description.

It is a basic diagram which shows the outline of the conventional reflow apparatus which can apply this invention. It is a perspective view used for description of one embodiment of this invention. It is a perspective view used for description of one embodiment of this invention. It is a basic diagram used for description of control of the raising / lowering mechanism of this invention. It is a block diagram used for description of control of the raising / lowering mechanism of this invention. It is sectional drawing of the 1st example which applied this invention to single conveyance. It is sectional drawing of the 2nd example which applied this invention to single conveyance. It is sectional drawing of the 3rd example which applied this invention to single conveyance. It is sectional drawing used for description of the conventional single conveyance apparatus. It is sectional drawing of the 4th example which applied this invention to dual conveyance. It is sectional drawing of the 5th example which applied this invention to dual conveyance. It is sectional drawing of the 6th example which applied this invention to dual conveyance. It is sectional drawing used for description of the conventional dual conveyance apparatus.

Embodiments of the present invention will be described below. The description will be given in the following order.
<1. Example of reflow equipment>
<2. Embodiment>
<3. Modification>
The embodiment described below is a preferred specific example of the present invention, and various technically preferable limitations are given. However, the scope of the present invention is particularly limited to the present invention in the following description. Unless otherwise stated, the present invention is not limited to these embodiments.

<1. Example of reflow equipment>
FIG. 1 shows a schematic configuration of a conventional reflow apparatus 101 to which the present invention can be applied. The reflow apparatus 101 includes a furnace body 102, a conveyor 103 for passing an object to be heated, for example, a printed circuit board (hereinafter referred to as a workpiece) W on which both surface mounting electronic components are mounted, and a conveyor. Rotating bodies 105a, 105b, 105c, and 105d that define a moving path 103, a lower housing 104, and a hood 106 are provided.

  The furnace body 102 is for heating the workpiece W from above and below by the upper furnace body and the lower furnace body, and cooling after the heating. The transport conveyor 103 is one transport conveyor extending in the transport direction in the case of single transport, and two transport conveyors arranged in parallel with the transport direction in the case of dual transport. For example, a roller chain is used as the conveyor 103. A lower casing 104 that covers the entire lower portion of the reflow apparatus 101 and a hood 106 that covers the entire upper portion are provided. A hood 106 is placed on the lower housing 104.

  After the workpiece W is carried into the furnace body 102 from the carry-in entrance 107, it is carried by the conveyer 103 at a predetermined speed in the direction of the arrow (from left to right as viewed in FIG. 1), and finally taken out from the carry-out exit 108. It is. Although not shown, a work carry-in device for carrying the work W is provided in the front stage of the carry-in entrance 107, and a work carry-out apparatus for sending the work W to the outside is arranged in the rear stage of the carry-out port 108. .

  The furnace body 102 is sequentially divided into, for example, nine zones Z1 to Z9 along the conveyance path from the carry-in entrance 107 to the carry-out exit 108, and these zones Z1 to Z9 are arranged in an inline manner. Seven zones Z1 to Z7 from the carry-in port 107 side are heating zones, and two zones Z8 and Z9 on the carry-out port 108 side are cooling zones. A forced cooling unit (not shown) is provided in association with the cooling zones Z8 and Z9. The number of zones is an example, and other numbers of zones may be provided. The plurality of zones Z1 to Z9 controls the temperature of the workpiece W according to the temperature profile during reflow. Each of the heating zones Z1 to Z7 has an upper furnace body and a lower furnace body each including a blower.

  The first section is a temperature raising portion R1 where the temperature rises due to heating, the next section is a preheating (preheating) portion R2 where the temperature is substantially constant, the next section is a reflow (reflow) portion R3, and the last section The section is the cooling unit R4. The temperature raising portion R1 is a period in which the substrate is heated from room temperature to a preheating portion R2 (for example, 150 ° C. to 170 ° C.). The preheating portion R2 is a period for performing isothermal heating, activating the flux, removing the oxide film on the surface of the electrodes and solder powder, and eliminating uneven heating of the workpiece. The reflow portion R3 (for example, 220 ° C. to 240 ° C. at the peak temperature) is a period in which the solder is melted and the joining is completed. In the reflow portion R3, the temperature needs to be raised to a temperature exceeding the melting temperature of the solder. The last cooling part R4 is a period in which the printed circuit board is rapidly cooled to form a solder composition. In the case of lead-free solder, the temperature in the reflow portion is higher (for example, 240 ° C. to 260 ° C.).

  In the reflow apparatus 101 having such a configuration, the zones Z1 and Z2 are mainly responsible for temperature control of the temperature raising portion R1. The temperature control of the preheating part R2 is mainly handled by the zones Z3, Z4 and Z5. The zones Z6 and Z7 are responsible for temperature control of the reflow section R3. The temperature control of the cooling unit R4 is handled by the zone Z8 and the zone Z9.

<2. Embodiment>
In the reflow apparatus 101 described above, the upper furnace body of the furnace body 102 and the hood 106 are translated upward, and work openings are formed on both sides along the conveying direction of the furnace body 102. Work is performed through this opening, and maintenance work such as flux removal is performed.

  2 and 3 show the configuration of one embodiment. Although not shown, the hood 106 is configured by attaching a metal plate (outer plate) to the hood frame 1. The hood frame 1 is formed by assembling, for example, prismatic members into a roof shape covering the entire upper portion of the furnace body 102.

  Brackets 3a, 3b, 3c and 3d as two connecting portions on both side surfaces of the upper furnace body 2 (indicated by a two-dot chain line) of the furnace body 102 (if these brackets do not need to be particularly distinguished, they are simply brackets. 3) is fixed. The connecting portion is not limited to a plate shape, and a rod shape or the like may be used. 3A and 3B, the hood frame 1 is not shown, and the upper furnace body 2 is shown as a rectangular box. Two brackets 3a and 3c are attached to the upper furnace body 2 at a position equidistant from the work carry-in side, and two brackets 3b and 3d are attached at a position equidistant from the work carry-out side. That is, the bracket 3 is attached in the vicinity of the four corners of the upper furnace body 2.

The bracket 3 is formed by processing a metal plate into an L shape so that the horizontal plate and the vertical plate form an angle of about 90 degrees, and the vertical plate is fixed to the side surface of the upper furnace body 2. A horizontal plate of the bracket 3 is attached to the hood frame 1. For example, the horizontal plate of the bracket 3 is attached to two prismatic members extending in the furnace body extension direction of the hood frame 1. The total weight of the hood frame 1 and the upper furnace body 2 is 1.2 ton, for example. Furthermore, the furnace body 102 (upper furnace body 2) expands by a few millimeters during reflow operation compared to when it does not operate. The position of the bracket 3 changes due to the thermal expansion of the furnace body 102. In order to absorb this change, the horizontal plate of the bracket 3 is slidable with respect to the hood frame 1 at the mounting location.

  In one embodiment, the hood frame 1 and the upper furnace body 2 are moved up and down in the vertical direction. FIG. 3A shows a state where the hood frame 1 and the upper furnace body 2 are in the normal positions. FIG. 3B shows a state where the hood frame 1 and the upper furnace body 2 are in the maintenance position. At the maintenance position, the hood is translated upward, and an opening is formed between the hood and the housing. Maintenance work can be performed through this opening.

  The hood frame 1 and the upper furnace body 2 are moved in parallel by the lifting operation. The parallel movement means that all points of the hood frame 1 and the upper furnace body 2 move by an equal distance. However, when there is a difference that usually occurs due to errors such as gear backlash, it is also referred to as parallel movement. Initial adjustments are made as necessary, so that the hood frame 1 and the upper furnace body 2 are positioned horizontally. In the vicinity of the connecting position of the hood frame 1 and the bracket 3, elevating mechanisms 4 a, 4 b, 4 c and 4 d (referred to simply as the elevating mechanism 4 when these elevating mechanisms are not particularly required) are provided below the bracket 3. Has been placed. A motor 5 is provided as a single drive means for the lifting mechanism 4. The rotation of the motor 5 is controlled by a control unit (not shown).

  Between the motor 5 and the lifting mechanism 4, rotation transmission mechanism parts 6a, 6b, 6c, 6d for transmitting the driving force of the motor 5 to the lifting mechanism 4 (there is no need to distinguish these rotation transmission mechanism parts in particular). In this case, a rotation transmission mechanism 6 is simply provided). The elevating mechanism 4 is moved up and down by rotation of the screw shaft 7 and screw shafts 7 a, 7 b, 7 c, 7 d (which are simply referred to as screw shafts 7 when it is not necessary to distinguish these screw shafts). Movable struts 8a, 8b, 8c, and 8d (referred to simply as the movable struts 8 when there is no need to distinguish these movable struts).

  The rotation transmission mechanism 6 is provided with shafts 9a, 9b, 9c, and 9d for transmitting the rotation (they are simply referred to as the shafts 9 when it is not necessary to distinguish these axes). The motor 5 is coupled via one lifting mechanism, for example, a lifting mechanism 4a and a rotation transmission mechanism 6a. Furthermore, a handle 10 for manually generating a rotational force is attached to the rotation transmission mechanism 6d of the lifting mechanism 4d. The motor 5 and the rotation transmission mechanism 6 are installed on the lower side of the lower furnace body, for example, at the bottom of the reflow device. The further away from the lower furnace body, the less likely to be affected by the heat of the furnace body at the time of reflow, the possibility that the motor 5 and the rotation transmission mechanism 6 will fail due to heat can be reduced.

  In the rotation transmission mechanism 6a, the rotation of the motor 5 is transmitted to the screw shaft 7a and the shafts 9a and 9b. A rotational force is transmitted to the shaft 9a having substantially the same extension direction as the shaft of the motor 5 via a shaft coupling (coupling). A rotational force is transmitted to the screw shaft 7a and the shaft 9b in a direction different from the shaft of the motor 5 via a bevel gear. The rotation of the shaft 9a is transmitted to the rotation transmission mechanism 6b, and the rotation of the shaft 9b is transmitted to the rotation transmission mechanism 6c. The bevel gear is an example of a rotation transmission mechanism, and other mechanisms such as a worm gear may be used.

  In the rotation transmission mechanism 6b, the rotation of the shaft 9a is transmitted to the screw shaft 7b and the shaft 9d via the bevel gear. In the rotation transmission mechanism 6c, the rotation of the shaft 9b is transmitted to the screw shaft 7c via the bevel gear. In the rotation transmission mechanism 6d, the rotation of the shaft 9d is transmitted to the screw shaft 7d via the bevel gear. The rotation may be transmitted by a shaft 9c instead of the shaft 9d. The four shafts 9 form a rectangle on the horizontal plane, and the strength against twisting and the like can be increased.

  As described above, in the rotation transmission mechanism 6a, the rotation of the motor 5 is transmitted to the screw shaft 7a, the shaft 9a, and the shaft 9b. And the path of (axis 9a → rotation transmission mechanism 6b (screw shaft 7b) → axis 9d → rotation transmission mechanism 6d (screw shaft 7d)) and (axis 9b → rotation transmission mechanism 6c (screw shaft 7c)) The rotation of the motor 5 is transmitted along the path. Since the rotations of the shafts 9a, 9b, and 9d are synchronized, the four screw shafts 7a to 7d are also rotated in synchronization.

  A trapezoidal screw nut that meshes with the screw shaft is attached to the movable column 8. The nut is raised by the rotation of the screw shaft 7 in a predetermined direction, and the nut is lowered by the rotation of the screw shaft 7 in the opposite direction. Therefore, the movable column 8 is moved up and down by the rotation of the screw shaft 7. A support plate at the upper end of the movable column 8 is attached to the lower surface of the horizontal plate of the bracket 3. As described above, since the upper furnace body 2 is thermally expanded, the bracket 3 is supported by the movable support column 8 so as to be displaceable. As shown in FIGS. 3A and 3B, when the movable support column 8 is moved up and down by the rotation of the screw shaft 7, the hood frame 1 and the upper furnace body 2 are moved up and down. FIG. 3A shows a normal position, and FIG. 3B shows a position during maintenance.

  The structure in which the screw shaft 7 and the nut are engaged has a self-locking function, and the position of the movable support column 8 is maintained when the rotation of the screw shaft 7 stops. Therefore, it is not necessary to provide a brake mechanism in the motor 5 and the rotation transmission mechanism unit 6. Since the brake mechanism is not provided, for example, by rotating the handle 10 during a power failure, the hood frame 1 and the upper furnace body 2 can be moved up and down by rotating the screw shaft. That is, the rotation of the handle 10 (rotation transmission mechanism 6d (screw shaft 7d) → shaft 9d → rotation transmission mechanism 6b (screw shaft 7b) → shaft 9a → rotation transmission mechanism 6a (screw shaft 7a) → shaft 9b → It is transmitted through the path of the rotation transmission mechanism 6c (screw shaft 7c). Since the rotations of the shafts 9a, 9b, and 9d are synchronized, the four screw shafts 7a to 7d are rotated in synchronization.

  If the four screw shafts 7 do not rotate synchronously for reasons such as damage to the rotation transmission mechanism 6, the reflow device may be damaged. Therefore, in order to monitor the rotation of the screw shaft 7 on the movable support column 8, for example, an optical rotation detection sensor is provided. Instead of detecting the rotation of the screw shaft 7, the elevation of the movable column 8 may be detected. A case where all the four screw shafts 7 are rotating is detected as a normal operation, and a case where even one of the screw shafts 7 is not rotating normally (stop and abnormal rotation speed) is detected as an abnormal operation. In the case of abnormal operation, the motor 5 is forcibly stopped.

  As shown in FIG. 4, in order to detect the raising and lowering of the movable support column 8, a sensor dog SD is attached to the movable support column 8, and the sensors S1, S2, and S2 are positioned at different heights in parallel with the moving direction of the movable support column 8. S3 is arranged. When the sensor dog SD approaches the sensors S1, S2, and S3, a detection signal is generated based on an optical detection operation, a magnetic detection operation, or an electrostatic detection operation. Furthermore, not only a non-contact type but a contact type may be used. As an example, a micro photo sensor is used. For example, the sensor S1 is provided at the start position, the sensor S3 is provided at the end position of the maximum height, and the sensor S2 is provided between the sensors S1 and S2. In FIG. 4, only one movable column 8 is shown, but sensors are similarly provided in association with all the movable columns. In FIG. 4, a bevel gear is shown as the rotation transmission mechanism unit 6.

  The movable column 8 is moved up and down by the motor 5 as a driving means. Therefore, as shown in FIG. 5, the sensors S1 and S2 associated with all the movable columns with respect to the control unit 31 that controls the driving of the motor 5. , S3 detection signals are supplied. The control unit 31 has a microprocessor and controls the rotation of the motor 5 according to software. For example, when the rotation of the motor 5 starts from the initial position and the detection signal of the sensor S1 is generated, the rotation of the motor 5 is stopped and the position of the movable column 8 is set as the initial position. When a command to raise the movable column 8 from the input unit 32 is supplied to the control unit 31, the control unit 31 starts rotating the motor 5. When the detection signal from the sensor S3 is obtained, the control unit 31 stops the rotation of the motor 5. The control part 31 can measure the raising / lowering speed of the movable support | pillar 8 by measuring the time interval of the detection signals of sensor S1, sensor S2, and sensor S3. When the ascending / descending speed of the movable struts 8 of the four elevating mechanisms varies more than a preset value, the control unit 31 urgently stops the rotation of the motor 5. The configuration for controlling the rotation of the motor 5 shown in FIGS. 4 and 5 is an example, and other configurations may be used.

  As described above, in one embodiment of the present invention, the motor 5 as the driving means is single and the four lifting mechanisms 4 are provided. Unlike this invention, it is also possible to provide a motor for each lifting mechanism. However, if separate motors are provided in this way, it is difficult to synchronize between the motors, raising and lowering defects due to the biting of the shaft, and there is a high possibility that parallel movement is impossible. Furthermore, since all the motors are stopped at the time of a power failure, they are manually moved separately, and there is a problem that parallel movement is difficult. Therefore, as in the present invention, it is possible to synchronize the ascending / descending operation of the elevating mechanism by a configuration driven by a single driving means, and there is an advantage that it can be driven manually at the time of power failure.

"Embodiment of single conveyance"
Furthermore, an embodiment of the present invention will be described with reference to the drawings. FIG. 6 is a cross-sectional view of a cross section when one zone of the heating zone is cut along a plane orthogonal to the conveyance direction, as viewed from the carry-in entrance side. As shown in FIG. 6, the workpiece W is placed on the conveyor 103 and conveyed in the gap between the upper furnace body 2 and the lower furnace body 21.

  The space formed by the upper furnace body 2 and the lower furnace body 21 is filled with, for example, nitrogen (N2) gas that is an atmospheric gas. The atmospheric gas may be atmospheric gas instead of nitrogen (N2) gas. The upper furnace body 2 and the lower furnace body 21 heat the work W by blowing hot air (heated atmospheric gas) onto the work W. In the upper furnace body 2, for example, a heating unit including a blower configured as a turbo fan, a heater, and a panel (heat storage member) having a large number of small holes through which hot air passes is arranged.

  In the normal position shown in FIG. 6A, the hood 106 is placed on the lower housing 104. The hood 106 has a configuration in which a metal plate (outer plate) is attached to the hood frame 1. Hot air that has passed through the small holes in the panel is blown from above on the workpiece W conveyed by the conveyor 103. A similar heating unit is also provided in the lower furnace body 21, and hot air is blown against the workpiece W from below.

  At the time of maintenance, the upper furnace body 2 and the hood 106 are translated upward by the elevating mechanism 4 to the position shown in FIG. 6B. At this position, maintenance work such as internal cleaning can be performed through openings on both sides formed between the lower housing 104 and the hood 106.

"Modification of single transfer"
Modified examples in which the present invention is applied to single conveyance are shown in FIGS. In the configuration shown in FIG. 7, the side surface of the upper furnace body 2 and the inner surface of the hood 106 are connected by brackets 22 a and 22 b. Instead of the bracket 3 (3b, 3d), brackets 11a, 11b are provided on the side surfaces of the upper furnace body 2. The brackets 22a and 22b and the brackets 11a and 11b are provided with a configuration for absorbing thermal expansion of the upper furnace body 2. The ends of the movable columns 8b and 8d of the elevating mechanisms 4b and 4d push up the lower surfaces of the brackets 11a and 11b.

  In the normal position of FIG. 7A, the hood 106 overlaps with the lower casing 104. During maintenance, the upper furnace body 2 and the hood 106 are translated upward as shown in FIG. 7B. And maintenance work can be performed from the openings formed on both sides.

  In the configuration shown in FIG. 8, brackets 12a and 12b that connect the inner surface of the hood 106 and the movable support columns 8b and 8d are used instead of the brackets 11a and 11b in FIG. The brackets 22a and 22b and the brackets 12a and 12b are provided with a configuration for absorbing thermal expansion of the upper furnace body 2. The ends of the movable struts 8b and 8d of the elevating mechanisms 4b and 4d push up the lower surfaces of the brackets 12a and 12b.

  In the normal position of FIG. 8A, the hood 106 overlaps with the lower housing 104. During maintenance, the upper furnace body 2 and the hood 106 are translated upward as shown in FIG. 8B. And maintenance work can be performed from the openings formed on both sides.

  FIG. 9 shows a conventional configuration. The side surfaces of the upper furnace body 2 and the inner surface of the hood 106 are connected by brackets 22a and 22b. The upper furnace body 2 and the hood 106 can be rotated by the hinge part 23. A bracket 24 is attached to the side surface of the upper furnace body 2 on the side where the hinge portion 23 is not provided. A drive mechanism including a rotating shaft 25 and a movable support column 26 is provided, and an opening is formed between the hood 106 and the lower housing 104 by the end of the movable support column 26 pushing up the bracket 24. In such a conventional configuration, since the opening is formed only on one side, there is a problem that maintenance work for the location on the back side becomes troublesome. In the present invention, since the openings are formed on both sides, such a problem does not occur.

“Embodiment of dual transport”
Furthermore, a configuration when the present invention is applied to dual conveyance will be described. FIG. 10 is a cross-sectional view of a cross section when one zone of the heating zone is cut along a plane orthogonal to the transport direction, as viewed from the carry-in entrance side.

  In the upper furnace body 2 and the lower furnace body 21, a first transport conveyor 103a and a second transport conveyor 103b are provided in parallel. A partition provided between these conveyors divides the space in the furnace into a space on the first conveyor 103a side and a space on the second conveyor 103b side. The partition wall is composed of an upper partition wall 15a on the upper furnace body side and a lower partition wall 15b on the lower furnace body side.

  A partition has a heat insulation effect, for example. The upper partition wall 15a and the lower partition wall 15b are configured such that, for example, two metal plate-like bodies (for example, stainless steel plates, etc.) each having a space into which gas is introduced face each other. One of the opposing end portions of the upper partition 15a and the lower partition 15b facing each other has a tapered shape, and the other has an open shape. One opposing end portion that is tapered may be fitted / separated from the other opposing end portion that is open.

  In the space on the side of the conveyor 103a formed by the upper furnace body 2, the lower furnace body 21, the upper partition wall 15a, and the lower partition wall 15b, the heating unit in the upper furnace body 2 and the heating unit in the lower furnace body 21 serve as the workpiece Wa. On the other hand, hot air (heated atmospheric gas) is ejected to heat the workpiece Wa. The upper furnace body 2 and the lower furnace body 21 are each provided with a heating unit including a blower having a turbo fan configuration, a heater, and a panel (heat storage member) having a large number of small holes through which hot air passes. In the space on the side of the conveyor 103b, the workpiece Wb is heated by the same heating unit.

  In the normal position illustrated in FIG. 10A, the hood 106 is placed on the lower housing 104. The hood 106 has a configuration in which a metal plate (outer plate) is attached to the hood frame 1. Hot air that has passed through the small holes in the panel is blown from above and below the workpieces Wa and Wb conveyed by the conveyors 103a and 103b.

  At the time of maintenance, the upper furnace body 2 and the hood 106 are translated upward by the elevating mechanism 4 to the position shown in FIG. 10B. At this position, maintenance work such as internal cleaning can be performed through openings on both sides formed between the lower housing 104 and the hood 106.

"Modification of dual transport"
Modified examples in which the present invention is applied to dual conveyance are shown in FIGS. 11 and 12, respectively. In the configuration shown in FIG. 11, the side surface of the upper furnace body 2 and the inner surface of the hood 106 are connected by brackets 22a and 22b. Instead of the bracket 3 (3b, 3d), brackets 11a, 11b are provided on the side surfaces of the upper furnace body 2. The brackets 22a and 22b and the brackets 11a and 11b are provided with a slide structure for absorbing thermal expansion of the upper furnace body 2. The ends of the movable columns 8b and 8d of the elevating mechanisms 4b and 4d push up the lower surfaces of the brackets 11a and 11b.

  In the normal position of FIG. 11A, the hood 106 overlaps the lower casing 104. During maintenance, the upper furnace body 2 and the hood 106 are translated upward as shown in FIG. 11B. And maintenance work can be performed from the openings formed on both sides.

  In the configuration shown in FIG. 12, brackets 12a and 12b that connect the inner surface of the hood 106 and the end portions of the movable support columns 8b and 8d are used instead of the brackets 11a and 11b in FIG. The brackets 22a and 22b and the brackets 12a and 12b are provided with a slide structure for absorbing thermal expansion of the upper furnace body 2. The ends of the movable struts 8b and 8d of the elevating mechanisms 4b and 4d push up the lower surfaces of the brackets 12a and 12b.

  In the normal position of FIG. 12A, the hood 106 overlaps with the lower housing 104. During maintenance, the upper furnace body 2 and the hood 106 are translated upward as shown in FIG. 12B. And maintenance work can be performed from the openings formed on both sides.

  FIG. 13 shows a configuration in which a hinge structure opening / closing method is applied to one side of a conventional technique for dual conveyance including an upper bulkhead 15a on the upper furnace side and a lower bulkhead 15b on the lower furnace side. The side surfaces of the upper furnace body 2 and the inner surface of the hood 106 are connected by brackets 22a and 22b. The upper furnace body 2 and the hood 106 can be rotated by the hinge part 23. A bracket 24 is attached to the side surface of the upper furnace body 2 on the side where the hinge portion 23 is not provided. A drive mechanism including a rotating shaft 25 and a movable support column 26 is provided, and an opening is formed between the hood 106 and the lower housing 104 by the end of the movable support column 26 pushing up the bracket 24. In such a conventional configuration, since the opening is formed only on one side, there is a problem that maintenance work for the location on the back side becomes troublesome. In particular, in the case of a multi-conveyance type such as dual conveyance, it becomes difficult to perform maintenance work such as cleaning of a conveyance part far from the opening (in the example of FIG. 13, the conveyance conveyor 103b side). In the present invention, since the openings are formed on both sides, such a problem does not occur.

  Further, in the one-side hinge structure shown in FIG. 13, since the concave member of the upper partition wall moves from obliquely upward toward the convex member of the lower partition wall, it is necessary to set a large opening of the concave member, and as a result, the degree of adhesion The effect of preventing temperature interference between the two spaces is reduced by the low fitting portion. Since this invention is a parallel movement, the opening of the recess material of the fitting portion can be reduced as compared with the case where the one-side hinge structure shown in FIG. 13 is adopted, and the advantage of preventing the temperature interference of the partition wall from being impaired. There is.

<3. Modification>
Although the embodiments of the present disclosure have been specifically described above, the present disclosure is not limited to the above-described embodiments, and various modifications based on the technical idea of the present disclosure are possible. For example, according to the present invention, a chain may be used in addition to the shaft as a rotation transmission mechanism between a plurality of lifting mechanisms. Further, the number of lifting mechanisms may be other than the above-described embodiment. Furthermore, the present invention can be applied not only to the reflow device but also to a heating device for curing the resin. Further, the configurations, methods, processes, shapes, materials, numerical values, and the like given in the above-described embodiments are merely examples, and different configurations, methods, processes, shapes, materials, numerical values, etc. are used as necessary. May be. The configurations, methods, steps, shapes, materials, numerical values, and the like of the above-described embodiments can be combined with each other without departing from the gist of the present disclosure.

W, Wa, Wb ... Work 1 ... Hood frame 2 ... Upper furnace body 3, 3a-3d ... Brackets 4, 4a-4d ... Lifting mechanism 5 ... Motors 6, 6a- 6d ... rotation transmission mechanism 7, 7a-7d ... screw shaft 8, 8a-8d ... movable strut 9, 9a-9d ... shaft 10 ... handle 11a, 11b ... bracket 12a , 12b ... Bracket 15a ... Lower partition 15b ... Upper partition 101 ... Reflow device 102 ... Furnace 103, 103a, 103b ... Conveyor 106 ... Hood

Claims (8)

A transport device for transporting a heated object;
Provided above the transport device, an upper furnace body which heats the object to be heated,
A plurality of lifting mechanisms to translate the pre-SL upper furnace body in a vertical direction,
A part of a casing for housing the upper furnace body and the transfer device, and a hood that is translated in a vertical direction together with the upper furnace body ;
Comprising a single drive means and a rotation transmission mechanism provided between the plurality of lifting mechanisms ,
A conveyance heating apparatus in which an opening is formed below each of the upper furnace body and the hood in a state where the upper furnace body and the hood are raised by the lifting mechanism .   The conveyance heating apparatus according to claim 1, further comprising a lower furnace body facing the upper furnace body across a space in which the conveyance apparatus is disposed. At least two lifting mechanisms are provided on both sides along the conveying direction of the upper furnace body,
The conveyance heating apparatus according to claim 1, wherein a shaft of the rotation transmission mechanism is provided between the elevating mechanisms.   The conveyance heating apparatus according to any one of claims 1 to 3, wherein the elevating mechanism includes a screw shaft rotated by the driving means, and a movable support column attached to a nut of a trapezoidal screw that meshes with the screw shaft and moves up and down. .   The conveyance heating apparatus in any one of Claims 1 thru | or 4 with which the said conveyance apparatus has the some conveyance conveyor provided in parallel along the conveyance direction.   The conveyance heating apparatus according to claim 5, wherein a partition is provided between each of the plurality of conveyance conveyors, and the partition is separated or fitted to the upper partition and the lower partition at the connection position.   The conveyance heating apparatus according to claim 1, wherein the upper furnace body and the hood are connected by a connecting portion, and the upper furnace body and the hood are integrally moved up and down by the lifting mechanism.   The conveyance heating apparatus according to claim 7, wherein one of the hood and the connecting portion is slid by thermal expansion of the upper furnace body.

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