JP6673809B2 - Work temperature measuring device and heat treatment furnace having the same - Google Patents

Description

  The present disclosure relates to a work temperature measuring device for measuring the temperature of a work arranged inside a housing such as a heat treatment furnace, and a heat treatment furnace including the same.

  Some industrial furnaces not only transport a work in the horizontal direction, but also move it up and down. As one of such industrial furnaces, there is a heat treatment furnace. For example, there is a quenching device having an oil cooling zone below a heating zone for heat-treating a work and a gas cooling zone above the heating zone (for example, Patent Document 1). 1).

  In such a heat treatment furnace, there is a method in which a data logger is put in a heat-resistant box and the work is put into the furnace together with the work in order to measure a temperature change of the work placed in the heat treatment furnace (for example, Patent Document 2).

JP 2007-84863 A JP 2000-130961 A Patent No. 4656808 Patent No. 4370938

  However, in the configuration as in Patent Literature 2, it is necessary to take out the data logger from the furnace in order to confirm the data recorded in the data logger, and measurement in real time is not possible.

  In order to measure the temperature of the work in real time, a thermocouple is provided at the tip of an elevating pin for raising and lowering the work, and the thermocouple is brought into contact with the work to reduce the temperature of the work, as in Patent Document 3, for example. Some are measured. However, in the configuration as in Patent Literature 3, since the temperature of the work cannot be measured when the work is separated from the tip of the elevating pin, the measurement is limited.

  For example, as disclosed in Patent Literature 4, a compensating lead wire (wire-type thermocouple) is externally introduced. In the configuration of Patent Literature 4, a sensor unit is fixed to a tray for transporting a work, and a compensating conductor is connected to the sensor unit so that the compensating conductor can be wound in a furnace. However, in such a configuration, since the compensating conductor needs to be routed in the furnace, the movement of the tray on which the work is placed may be hindered by the compensating conductor.

  The present disclosure solves the above-described problem, and provides a work temperature measurement device capable of measuring a temperature change of a work during heat treatment in real time with a configuration that does not hinder movement of the work, and a heat treatment furnace including the work temperature measurement device. With the goal.

  A work temperature measurement device according to an embodiment of the present disclosure is a work temperature measurement device for measuring the temperature of a work disposed inside a housing, and is provided on a tray for mounting and transporting the work. A first conductive plate of a conductive material, which is fixed and electrically connected to a first thermocouple for measuring the temperature of the workpiece, and attached to a lifting elevator for mounting and lowering the tray; A first conductive rod having a contact end made of a conductive material for contacting the first conductive plate; and a first conductive rod provided outside the housing and electrically connected to the contact end of the first conductive rod. And a first temperature measuring device connected to the work temperature measuring device.

  According to the above configuration, the temperature of the work can be measured in more real time with a configuration that does not hinder the movement of the work.

  A work temperature measurement device according to an embodiment of the present disclosure is a work temperature measurement device for measuring the temperature of a work disposed inside a housing, and is provided on a tray for mounting and transporting the work. A first conductive plate of a conductive material, which is fixed and electrically connected to a first thermocouple for measuring the temperature of the workpiece; and a first conductive plate attached to an inner wall surface of the housing, A first conductive rod having a contact end made of a conductive material for contacting the first conductive rod, and a first conductive rod provided outside the housing and electrically connected to the contact end of the first conductive rod. A temperature measuring device, wherein the first conductive plate contacts the contact end of the first conductive rod at a raised position where the tray is raised by a lifting mechanism for lifting and lowering the tray. Have up and down length, A chromatography peak temperature measuring device.

  According to the configuration, it is possible to measure the temperature of the work in real time with a structure that does not hinder the movement of the work even when the work is moved by the lifting mechanism.

  A work temperature measurement device according to an embodiment of the present disclosure is a work temperature measurement device for measuring the temperature of a work disposed inside a housing, and is provided on a tray for mounting and transporting the work. A first conductive plate of a conductive material, which is fixed and electrically connected to a first thermocouple for measuring the temperature of the workpiece, and attached to a lifting elevator for mounting and lowering the tray; A first conductive rod having a contact end made of a conductive material for contacting the first conductive plate; and a first conductive rod provided outside the housing and electrically connected to the contact end of the first conductive rod. A first temperature measuring device connected to the first conductive plate, wherein the first conductive plate is provided in the first position at a rising position where the tray is lifted from the lifting elevator by a lifting mechanism different from the lifting elevator. Continuity lock Having upper and lower lengths which maintain contact with the contact end, a work temperature measuring device.

  According to the above configuration, it is possible to measure the temperature of the work in real time with a configuration that does not hinder the movement of the work even when the work is moved by the elevator.

  In the work temperature measuring device, the first conductive rod includes an urging portion that urges the contact end portion in a direction of pressing the contact end portion against the first conductive plate, and the urging portion includes the contact end portion. A weight attached to the lift elevator so as to be integrally rotatable, and when the contact end is in contact with the first conductive plate, the biasing portion causes the contact end by its own weight. The portion may be rotationally biased in a direction in which the portion is pressed against the first conductive plate. Thereby, the contact state between the first conductive rod and the first conductive plate can be more reliably ensured, and the reliability of the temperature measurement can be improved. Further, the urging portion can be realized with a simple configuration.

  In the work temperature measuring device, a second conductive plate of a conductive material fixed to the tray and electrically connected to a second thermocouple for measuring the temperature of the work, and on an inner wall surface of the heat treatment furnace. A second conductive rod mounted and having a contact end of a conductive material for contacting the second conductive plate; and a contact end of the second conductive rod provided outside the heat treatment furnace. A second temperature measuring device electrically connected to the second conductive rod, wherein the second conductive rod connects the second conductive plate when the contact end contacts the second conductive plate. It may be electrically connected to the second temperature measuring device. Thus, even when the tray is away from the elevator, the temperature of the work can be measured in real time as long as the second conductive plate is in a position where it comes into contact with the second conductive rod.

  A heat treatment furnace according to an embodiment of the present disclosure is a heat treatment furnace that measures the temperature of the work using the work temperature measurement device, wherein the work temperature measurement device, the tray, the lift elevator, and / or the lift mechanism A heat treatment furnace comprising: According to the above configuration, the temperature of the work can be measured in real time with a configuration that does not hinder the movement of the work.

  In the heat treatment furnace, a heating zone that heat-treats the work, a relay zone provided on a side of the heating zone, and the work that is provided below and above the relay zone and that is heat-treated in the heating zone. A lower cooling zone and an upper cooling zone for performing a cooling process, the tray mounts and transports the work between the heating zone and the relay zone, and the elevating elevator includes the relay zone and the lower The tray may be placed and raised and lowered between the cooling zones, and the lifting mechanism may raise and lower the tray between the relay zone and the upper cooling zone independently of lifting and lowering by the lifting elevator. According to such a configuration, the temperature of the work placed on the tray is measured in real time even when the work is in the relay zone, moves downward from the relay zone, or moves upward from the relay zone. be able to.

  According to the present disclosure, a temperature change of a work can be measured in real time with a configuration that does not hinder movement of the work. In particular, even when the work is raised or lowered, the temperature change can be measured without interruption. For example, the temperature change when the work is lowered into the oil tank for quenching and rapidly cooled can be found on the spot.

FIG. 1 is a diagram illustrating a schematic configuration of a heat treatment furnace and a work temperature measuring device according to a first embodiment. Schematic diagram for explaining an operation example of a heat treatment furnace and a work temperature measuring device Schematic diagram for explaining an operation example of a heat treatment furnace and a work temperature measuring device Schematic diagram for explaining an operation example of a heat treatment furnace and a work temperature measuring device Schematic diagram for explaining an operation example of a heat treatment furnace and a work temperature measuring device Enlarged perspective view of conductive rod and conductive plate Schematic diagram showing a first rotation position of the conduction rod Schematic diagram showing a second rotation position of the conduction rod FIG. 2 is a diagram illustrating a schematic configuration of a heat treatment furnace and a work temperature measuring device according to a modification of the first embodiment. A view showing the movement of the lifting mechanism and the gripping arm (a view taken along the line AA in FIG. 1). Perspective view showing a plurality of conducting rods attached to a lift elevator The figure which shows the some conduction plate attached to the side part of the tray (the BB arrow view of FIG. 1). Diagram showing a mode in which only an upper cooling chamber is provided as a cooling chamber Diagram showing a mode in which only a lower cooling chamber is provided as a cooling chamber The figure which shows the schematic structure of the heat treatment furnace in Embodiment 2 (plan view which shows operation | movement of another form which changed the arrangement | positioning of the door).

  Hereinafter, preferred embodiments of a heat treatment furnace (casing) and a work temperature measuring device according to the present disclosure will be described with reference to the accompanying drawings. The present disclosure is not limited to the specific configurations of the following embodiments, but includes configurations based on similar technical ideas.

(Embodiment 1)
FIG. 1 is a diagram illustrating a schematic configuration of a heat treatment furnace 2 according to the first embodiment.

  The heat treatment furnace 2 is an example of a housing in which the work W is disposed. In the first embodiment, the heat treatment furnace 2 is a heat treatment furnace for quenching the work W (for example, an automobile engine gear housed in a wire mesh basket). is there. The heat treatment furnace 2 according to the first embodiment has a function of performing a cooling process in addition to a heat treatment of the workpiece W, and is configured as a multi-chamber heat treatment furnace that configures a plurality of spaces.

  As shown in FIG. 1, the heat treatment furnace 2 includes a heating zone 4, a relay zone 6, a lower cooling zone (oil cooling zone) 8, an upper cooling zone (gas cooling zone) 10, a tray 12, and an elevator 14, a lifting mechanism 16, a conduction plate 18, a conduction rod 20, a thermocouple 22, a temperature measuring device 24, and a compensating lead 26.

  The heat treatment furnace 2 shown in FIG. 1 heat-treats the work W in the heating zone 4, horizontally conveys the heat-treated work W to the relay zone 6, and then lowers or raises or lowers the lowering zone 8 by the elevator 14. The cooling process is performed by ascending to the upper cooling zone 10 by 16.

  In particular, the invention of the present disclosure includes a conductive plate 18 provided on the tray 12 and a conductive rod 20 provided on the elevator 14. By bringing the conductive plate 18 into contact with the conductive rod 20 to make it conductive, the thermocouple 22 connected to the conductive plate 18 and the temperature measuring device 24 connected to the conductive rod 20 are electrically connected. With such a configuration, even when the work W is in the relay zone 6 or moves downward or upward from the relay zone 6, the contact between the conductive plate 18 and the conductive rod 20 is ensured and the conductive rod 20 is made conductive, so that the heat treatment furnace 2 The temperature of the work W placed in the inside can be measured in real time by the temperature measuring device 24.

  The “work temperature measuring device” for measuring the temperature of the work W in the heat treatment furnace 2 includes the conductive plate 18, the conductive rod 20, the thermocouple 22, the temperature measuring device 24, and the compensating conductor 26.

  Hereinafter, respective components of the heat treatment furnace 2 and the work temperature measuring device will be described.

  The heating zone 4 is a space for heating the work W. The heating zone 4 heats the work W to a predetermined temperature (for example, 1350 ° C.) in a vacuum or a reduced-pressure atmosphere below the atmospheric pressure. FIG. 1 illustrates a state where the work W is arranged in the relay zone 6 instead of the heating zone 4.

  The relay zone 6 is a space provided on the side of the heating zone 4. An opening 5a is provided in a wall surface between the relay zone 6 and the heating zone 4, and a door 5 that closes each space so as to be able to be hermetically closed is provided. A door pocket 7 for storing the door 5 is provided above the opening 5a. The door 5 is hung from above the door pocket 7 by a chain 5b or the like, and the chain 5b is taken up from the outside by the elevating mechanism 5c, and is raised and lowered by being sent out. The relay zone 6 is a space serving as a relay point when the workpiece W heated in the heating zone 4 moves to the lower cooling zone 8 or the upper cooling zone 10. In the example of FIG. 1, a lower cooling zone 8 is provided below the relay zone 6, and an upper cooling zone 10 is provided above the relay zone 6. The lower cooling zone 8 and the upper cooling zone 10 are formed as an integrated space continuous with the relay zone 6. An opening 51 a is also provided on a wall surface between the heating zone 4 and the outside, and can be opened and closed by a door 51. The door 51 is moved up and down by the chain 51b and the elevating mechanism 51c, similarly to the door 5 described above.

  The lower cooling zone 8 is a space for cooling the work W below the relay zone 6. The lower cooling zone 8 of the first embodiment has a function of performing an oil-cooling type cooling process, and is filled with oil at a predetermined temperature (for example, 120 ° C.). The work W is cooled and quenched by immersing the work W in the oil in the lower cooling zone 8.

The upper cooling zone 10 is a space for cooling the work W above the relay zone 6. The upper cooling zone 10 of the first embodiment has a function of performing a gas-cooling type cooling process, and is capable of spraying a cooling gas (for example, N ₂ (150 kPa (abs))) at a predetermined temperature (for example, normal temperature). It is configured. By blowing a cooling gas into the upper cooling zone 10 in a state where the work W is arranged in the upper cooling zone 10, the work W is cooled and quenched.

  The cooling rate of the oil-cooled cooling process is faster than that of the gas-cooled cooling process. Therefore, it is possible to select one or both of the cooling process of the lower cooling zone 8 and the cooling process of the upper cooling zone 10 in consideration of the material characteristics and the like desired for each type of the work W.

  The tray 12 is a member for placing and transporting the work W in the heat treatment furnace 2. The tray 12 supports the work W from below when the work W is in the heating zone 4, the relay zone 6, the lower cooling zone 8, the upper cooling zone 10, and when moving in those spaces.

  The tray 12 according to the first embodiment has an L-shaped cross section as shown in FIG. The tray 12 has a bottom portion 12a extending in the horizontal direction and a side portion 12b extending in the vertical direction. The bottom surface portion 12a forms a bottom surface on which the work W is placed. The side surface portion 12b forms a side surface for fixing a conductive plate 18 described later.

  The conduction plate 18 is a metal plate-shaped member fixed to the side surface 12 b of the tray 12. The conduction plate 18 is provided in a pair of two so as to form a thermocouple together with the conduction rod 20, and each of the two plates is of the same type of metal (for example, a metal used for a thermocouple 22 for temperature measurement described later). Chromel and alumel) and is a conductive material.

  The conduction plate 18 is provided for electrically connecting the thermocouple 22 to a temperature measuring device 24 provided outside the heat treatment furnace 2. As shown in FIG. 1, the conductive plate 18 is fixed to the rear side of the side surface portion 12 b of the tray 12 as a vertically extending plate. The “rear surface” is a side surface of the side surface portion 12 b of the tray 12 facing the side opposite to the side on which the work W is placed.

  The elevating elevator 14 is for raising and lowering the tray 12 on which the work W is placed. The elevator 14 according to the first embodiment moves up and down between the relay zone 6 and the lower cooling zone 8 with the tray 12 placed thereon. The lifting elevator 14 is raised and lowered by a lifting mechanism (not shown).

  The elevator 14 has an L-shaped cross section, like the tray 12. The elevating elevator 14 has, for example, two fork-shaped bottom portions 14a extending in the horizontal direction (only one near side is shown in FIG. 1) and a side surface portion 14b extending in the vertical direction. The bottom surface portion 14a forms a bottom surface on which the tray 12 is placed. The side surface portion 14b forms a side surface for attaching the conduction rod 20.

  The conductive rod 20 is a member that forms a thermocouple together with the conductive plate 18, and is provided as a pair as in the case of the conductive plate 18. A conductive portion (a contact end portion 20a to be described later) of the conductive rod 20 is formed of the same type of metal (for example, chromel and alumel) as the conductive plate 18 and is made of a conductive material. The conduction rod 20 is attached to the side surface portion 14b of the elevator 14 so as to contact and conduct with the conduction plate 18. The conductive rod 20 has a contact end portion 20a that protrudes frontward from the side surface portion 14b of the elevator 14 and contacts the conductive plate 18. The “front” is a side surface of the side surface portion 14b of the elevator 14 facing the side on which the tray 12 is placed.

  The compensating lead 26 is electrically connected to the contact end 20a. The compensating lead 26 is formed of the same type of metal as the thermocouple 22 (for example, chromel and alumel). The compensating lead 26 is electrically connected to the temperature measuring device 24. The contact end 20a is connected to the temperature measuring device 24 via the compensating lead 26.

  The detailed configuration of the conductive rod 20 will be described later.

  The lifting mechanism 16 is a lifting mechanism for raising and lowering the tray 12 on which the work W is placed, separately from the lifting elevator 14. The elevating mechanism 16 has a function of elevating the tray 12 between the relay zone 6 and the upper cooling zone 10 independently of elevating by the elevating elevator 14. The elevating mechanism 16 is constituted by, for example, a grip arm capable of gripping the tray 12. By lifting the gripped tray 12 from the bottom surface portion 14 a of the elevator 14, the lifting mechanism 16 can be raised from the relay zone 6 to the upper cooling zone 10. it can. Specifically, as shown in FIG. 8, the arm 17 descends from the fixed position (FIG. 8A) with the four arms 17 (only two arms 17 are shown in FIG. 8) opened (FIG. 8B). . After that, the arm 17 is closed, and the claw at the tip is positioned below the bottom surface portion 12a of the tray 12 (FIG. 8C), and the tray is raised in that state (FIG. 8D).

  Returning to FIG. 1, the thermocouple 22 is a wiring-type thermocouple used to electrically connect the work W and the temperature measuring device 24. A plurality of thermocouples 22 are provided as shown in FIG. 1, and are connected between the measurement point P of the work W and the conduction plate 18. In FIG. 1, the contacts at the tips of the three thermocouples 22 are attached to the measurement points P of the workpiece W. The thermocouple 22 is electrically connected to the temperature measuring device 24 via the conduction plate 18, the conduction rod 20 (the contact end 20 a), and the compensating lead 26.

  The temperature measuring device 24 is a temperature measuring device for measuring the temperature of the work W using a thermocouple. The temperature measuring device 24 is electrically connected to the contact end 20a of the conducting rod 20 via the compensating lead 26 as shown in FIG. The temperature measuring device 24 is electrically connected to the work W via the compensating lead wire 26, the contact end 20 a of the conductive rod 20, the conductive plate 18 and the thermocouple 22, and thereby the work placed on the tray 12. The temperature at the measurement point P of W can be measured.

  The compensating lead 26 is a compensating lead for electrically connecting the contact end 20 a of the conductive rod 20 and the temperature measuring device 24. The compensating lead wire 26 of the first embodiment is configured by a stretchable compensating lead wire (for example, wound in a coil shape). Therefore, even when the elevator 14 descends, an electrical connection with the contact end 20a is ensured.

  An operation example of the heat treatment furnace 2 configured as described above will be described with reference to FIGS.

  First, the work W is carried into the heating chamber 4 as shown in FIG. Specifically, the door 51 is raised and opened, and the work W placed on the bottom surface 12a of the tray 12 is carried into the heat treatment furnace 2 through the opening 51a. Thereafter, the door 51 is lowered to close the opening 51a. For carrying in the tray 12 and the work W, any transport mechanism may be used, such as a roller (not shown) on which the bottom surface portion 12a of the tray 12 is mounted is rotationally driven from the outside.

Next, the work W is subjected to a heat treatment. Specifically, a predetermined heating gas (for example, N ₂ gas) is introduced after the inside of the heating zone 4 is made into a vacuum state or a reduced pressure atmosphere in a state where the heating zone 4 is sealed by the door 5 and the door 51. Thereby, the work W in the heating zone 4 is heated to a predetermined temperature (for example, 1200 ° C.).

  Next, the tray 12 is moved to the relay zone 6. Specifically, the door 5 is raised and opened, and the work W heated in the heating zone 4 is horizontally moved from the opening 5a toward the relay zone 6. The transport mechanism (not shown) described above is used to move the tray 12. Thereby, the tray 12 and the work W are arranged in the relay zone 6 provided on the side of the heating zone 4 as shown in FIG. Then, the door 5 is lowered to close the opening 5a.

  As shown in FIG. 3, the tray 12 transported to the relay zone 6 is placed on the bottom surface 14 a of the elevator 14. At this time, the conductive plate 18 fixed to the tray 12 comes into contact with the contact end 20a of the conductive rod 20 attached to the elevator 14. As a result, the work W and the temperature measuring device 24 are electrically connected to each other through the thermocouple 22, the conductive plate 18, the contact end 20a of the conductive rod 20, and the compensating lead wire 26. The temperature of the work W can be measured.

  According to the above-described method, since the contact-type temperature measurement method is performed by contact between the conductive plate 18 and the conductive rod 20, the electrical connection is made by using a compensating wire or the like instead of the conductive plate 18 and the conductive rod 20. Alternatively, the tray 12 can be configured so as not to hinder the movement of the tray 12 in the heat treatment furnace 2. Thereby, the tray 12 can be moved smoothly in the heat treatment furnace 2.

  Next, the tray 12 is moved to the lower cooling zone 8 or the upper cooling zone 10. As described above, the cooling process of the lower cooling zone 8 and / or the cooling process of the upper cooling zone 10 are selected according to the desired material characteristics of the work W or the like.

  By way of example, FIG. 4A shows a state of being lowered to the lower cooling zone 8, and FIG. 4B shows a state of being raised to the upper cooling zone 10.

  In order to lower the tray 12 to the lower cooling zone 8 as shown in FIG. 4A, the tray 12 on which the work W is placed is lowered integrally by lowering the elevator 14. Thereby, the tray 12 is arranged in the lower cooling zone 8, and the work W placed on the tray 12 is immersed in the cooling oil in the lower cooling zone 8. The work W is cooled by being immersed in cooling oil in the lower cooling zone 8, and is subjected to a quenching process.

  As the elevator 14 descends, the compensating lead 26 also extends and extends. By thus configuring the compensating conductor 26 in a telescopic manner, the electrical connection between the contact end 20a and the temperature measuring device 24 is stably secured even when the elevator 14 descends. In the state before the movement to the lower cooling zone 8 (the state shown in FIG. 3), the compensating lead wire 26 is contracted, so that the transport of the tray 12 can be configured so as not to be hindered.

  As shown in FIG. 4A, even when the tray 12 and the work W are lowered to the lower cooling zone 8, the contact state between the conduction plate 18 and the contact end 20a is ensured, and the work W Is ready to measure the temperature. Such a contact state is because the contact end 20a is attached to the elevator 14 on which the tray 12 is mounted while the conduction plate 18 is fixed to the tray 12, and the conduction plate 18 and the contact end 20a are brought into contact. Can be secured. Accordingly, the temperature of the work W can be measured in real time while the work W is being lowered from the relay zone 6 to the lower cooling zone 8 and while being cooled in the lower cooling zone 8.

  On the other hand, as shown in FIG. 4B, in order to raise the tray 12 to the upper cooling zone 10, the tray 12 on which the work W is placed is raised from the bottom portion 14 a of the lifting elevator 14 by driving the lifting mechanism 16. Let it. At this time, the conduction plate 18 of the tray 12 slides up while maintaining the contact state with the contact end portion 20a. A roller (not shown) of the same material may be attached to the contact end 20a in order to smooth the sliding.

  The work W placed on the tray 12 in the upper cooling zone 10 is cooled by blowing a predetermined cooling gas, and is quenched.

  As shown in FIG. 4B, even when the tray 12 is raised to the upper cooling zone 10, the contact state between the conduction plate 18 and the contact end 20a is ensured. Such a contact state is such that the conductive plate 18 fixed to the tray 12 has a vertical length capable of maintaining the contact with the contact end portion 20a of the conductive rod 20 even when the tray 12 is at the raised position by the lifting mechanism 16. Thus, it can be secured. Thus, the temperature of the workpiece W can be measured in real time while the workpiece W is rising from the relay zone 6 to the upper cooling zone 10 and while being cooled in the upper cooling zone 10.

  The work W that has completed the cooling process in the lower cooling zone 8 or the upper cooling zone 10 is thereafter returned to the relay zone 6. Thereafter, the door 5 is opened, the tray 12 on which the work W is placed is moved to the heating chamber 4, the door 5 is closed, the door 51 is opened, and then the heat treatment furnace 2 is carried out.

  By providing the conductive plate 18 and the conductive rod 20 described above, the temperature of the work W placed on the tray 12 in the relay zone 6, the lower cooling zone 8, and the upper cooling zone 10, or the tray 12 moving between them, is thermoelectrically controlled. It can be measured in real time by the pair method.

  The work temperature measurement device of the first embodiment is a work temperature measurement device for measuring the temperature of a work W disposed inside the heat treatment furnace 2 (casing), and includes a (first) conduction plate 18. , A (first) conducting rod 20 and a (first) temperature measuring device 24. The conductive plate 18 is fixed to the tray 12 for placing and transporting the work W, and is made of a conductive material (this embodiment) electrically connected to the (first) thermocouple 22 for measuring the temperature of the work W. In the first embodiment, the plate is made of the same material as the thermocouple 22). The conductive rod 20 is attached to a lift elevator 14 for placing and raising and lowering the tray 12, and a contact end made of a conductive material (the same material as the thermocouple 22 in the first embodiment) for contacting the conductive plate 18. It has a portion 20a. The temperature measuring device 24 is a measuring device provided outside the heat treatment furnace 2 and electrically connected to the contact end 20 a of the conductive rod 20. The conduction plate 18 has a vertical length that maintains contact with the contact end 20a of the conduction rod 20 at a raised position where the tray 12 is lifted from the elevator 14 by a lifting mechanism 16 different from the elevator 14.

  According to such a configuration, by the contact between the conductive plate 18 and the conductive rod 20, the thermocouple 22 can be electrically connected to the temperature measuring device 24 to measure the temperature of the work W. Therefore, when the tray 12 is placed on the elevator 14, the temperature of the work W placed on the tray 12 can be measured in real time. Further, since the conductive plate 18 has a vertical length that maintains the contact with the contact end portion 20a even at the raised position where the tray 12 is raised, the conductive plate 18 can be moved up or down while the tray 12 is raised from the elevator 14. The temperature of the work W placed on the work 12 can be measured in real time.

  Further, since the contact-type temperature measurement is performed to secure electrical connection by contact between the conductive plate 18 and the conductive rod 20, unlike the case where a compensating lead wire or the like is provided between the tray 12 and the elevator 14, the tray 12 The work W can be moved smoothly without hindering the movement of the work W. In this manner, the temperature of the work W can be measured in real time with a configuration that does not hinder the movement of the work W.

  Further, according to the work temperature measuring device of the first embodiment, the compensating lead wire 26 that electrically connects the contact end portion 20a of the conduction rod 20 and the temperature measuring device 24 is, for example, spirally wound, and is configured to be expandable and contractible. Is done.

  According to the above configuration, by configuring the compensating conductor 26 to be extendable and contractable, the electrical connection between the contact end 20a and the temperature measuring device 24 by the compensating conductor 26 is ensured even when the elevator 14 descends. can do.

  The heat treatment furnace 2 of the first embodiment including the above-described work temperature measurement device is a heat treatment furnace 2 that measures the temperature of the work W using the work temperature measurement device, and includes the work temperature measurement device and the tray 12 described above. , A lift elevator 14 and a lift mechanism 16.

  According to such a configuration, since the work temperature measuring device described above is provided, the temperature of the work W can be measured in real time with a configuration that does not hinder the movement of the work W.

  Further, the heat treatment furnace 2 of the first embodiment further includes a heating zone 4, a relay zone 6, a lower cooling zone 8, and an upper cooling zone 10. The heating zone 4 forms a space for heating the work W. The relay zone 6 forms a space provided on the side of the heating zone 4. The lower cooling zone 8 and the upper cooling zone 10 form spaces provided below and above the relay zone 6, and cool the work W heated in the heating zone 4. The tray 12 places and transports the work W between the heating zone 4 and the relay zone 6. The elevator 14 places the tray 12 between the relay zone 6 and the lower cooling zone 8 and moves up and down. The lifting mechanism 16 raises and lowers the tray 12 between the relay zone 6 and the upper cooling zone 10 independently of lifting and lowering by the lifting elevator 14.

  According to such a configuration, when the conductive plate 18 of the tray 12 and the conductive rod 20 of the elevator 14 come into contact with each other, the work W can be moved even when the work W is in the relay zone 6 or moves downward from the relay zone 6. Temperature can be measured in real time. In addition, even when the tray 12 moves upward from the relay zone 6, the temperature of the work W placed on the tray 12 can be measured in real time because the conductive plate 18 has the vertical length. .

  Next, a detailed configuration of the conductive rod 20 will be described with reference to FIGS. 5, 6A, and 6B.

  Although only one conductive rod 20 is shown in FIGS. 5, 6A, and 6B, in practice, a plurality of conductive rods 20 are attached to the side surface 12b of the tray 12 in accordance with the number of wires used for measurement. In the example shown in FIG. 1, there are three measurement points P on the workpiece W, and two wires are set as thermocouples for each of the measurement points P (in FIG. 1, two thermocouples 22 are one. All together). Therefore, as shown in FIG. 9, six conductive rods 20 are attached to the side surface portion 14 b of the elevator 14 in a row. Further, as shown in FIG. 10, six conductive plates 18 are also attached to the side surface 12 b of the tray 12 at positions corresponding to the six conductive rods 20 side by side.

  As shown in FIG. 5, the conductive plate 18 is attached to the side surface 12b of the tray 12 with the insulating plate 18a interposed therebetween. One of the two thermocouples 22 used for measuring the temperature of the work W is attached to the connection portion 18b of the conduction plate 18. The connecting portion 18b is composed of, for example, a screw portion protruding from the surface of the conduction plate 18 and a hexagon nut screwed into the screw portion. Another thermocouple 22 not connected to the connection portion 18b is connected to the measurement point P of the work W.

  The conductive rod 20 that is in contact with the conductive plate 18 is a mechanism that is rotatably attached to the side surface 14 b of the elevator 14. Specifically, the conductive rod 20 is formed by an L-shaped plate 20c having a contact end 20a at one end. A weight 20b is provided at the other end of the plate 20c. The weight 20b is an example of an urging portion for urging the contact end portion 20a in a direction of pressing the contact end portion 20a against the conductive plate 18 as described later. The compensating lead wire 26 described above is connected to the contact end 20a. The contact end 20a and the plate 20c are electrically insulated by an insulating push 20e. The material of the contact end 20a is the same as the material used for the thermocouple 22.

  The plate 20c has a rotating shaft 20d inserted through a bent portion serving as the center of rotation. The rotating shaft 20d is a rod-shaped protrusion fixed to the side surface portion 14b of the elevator 14, and the plate 20c is configured to be rotatable about the rotating shaft 20d.

  Further, a protrusion 14c is fixed to the side surface portion 14b of the elevator 14 as a stopper for regulating the rotational position of the plate 20c. The surroundings are shown in FIG.

  FIG. 6A shows a non-contact state where the conductive rod 20 having such a configuration is not in contact with the conductive plate 18, and FIG. 6B shows a contact state where the conductive rod 20 is in contact with the conductive plate 18.

  As shown in FIG. 6A, in a non-contact state between the conductive rod 20 and the conductive plate 18, the plate 20 c of the conductive rod 20 is stationary in a state in which the plate 20 c abuts on the protrusion 14 c by the weight S of the weight 20 b (first). Rotation position).

  On the other hand, as shown in FIG. 6B, in a state where the conductive plate 18 is in contact with the contact end 20a of the conductive rod 20, the plate 20c is rotated in a direction away from the protrusion 14c by pressing from the conductive plate 18. (The second rotation position).

  In the second rotation position shown in FIG. 6B, the weight 20b urges the plate 20c to rotate in the direction D of pressing the contact end portion 20a against the conductive plate 18 by its own weight S. With such a configuration, the contact between the contact end portion 20a and the conductive plate 18 can be more reliably ensured, and it is possible to cope with vibration, displacement, and the like when the tray 12 is transported. In addition, by using the own weight S of the weight 20b as the urging portion for urging the contact end portion 20a, the urging portion can be realized with a simple configuration.

  As described above, the invention of the present disclosure has been described with reference to the first embodiment, but the invention of the present disclosure is not limited to the first embodiment. For example, in the first embodiment, a case has been described in which two lower cooling zones 8 and an upper cooling zone 10 are provided as cooling zones for performing a cooling process on the work W, but the present invention is not limited to such a case. The case of only the upper cooling zone 10 as shown in FIG. 11 or the case of only the lower cooling zone 8 as shown in FIG. In addition, what is provided above and below may have a purpose other than cooling (for example, a heating zone having a different temperature).

  In the first embodiment, the heat treatment furnace 2 which is a kind of industrial furnace is described as an example of the housing. However, the present invention is not limited to such a heat treatment furnace, and is applicable to a quenching oil tank, a multi-chamber heating device, and the like. It is possible. Even in such a case, by providing the conductive rod and the conductive plate in the housing in which the work W is disposed as in the first embodiment, the temperature change of the work W in the housing can be monitored in real time. Can be measured.

  In the first embodiment, as shown in FIGS. 9 and 10, the plurality of conductive plates 18 and the plurality of conductive rods 20 are arranged side by side. However, when the height to be raised is not so high, May be arranged vertically. Then, many measurement points can be measured.

  In the first embodiment, the case where the weight 20b is provided as the urging portion for urging the contact end portion 20a is described. However, the present invention is not limited to such a case, and the case where the urging portion is not provided may be adopted. For example, a configuration in which the conductive rod and the contact end are fixed to the elevator 14 without rotation.

  Further, in the first embodiment, the case where the urging portion for urging the contact end portion 20a is the weight 20b that can rotate integrally with the contact end portion 20a has been described, but the present invention is not limited to such a case. Any urging portion may be used as long as it urges the contact end portion 20a in the direction of pressing against the conductive plate 18. For example, a configuration may be employed in which the contact end portion 20a is pressed against the conductive plate 18 by a spring. Such a configuration is effective when the temperature inside the heating chamber 4 becomes high, so that the spring does not lose its elasticity due to thermal expansion.

  In the first embodiment, the case where the conductive plate 18 and the conductive rod 20 are provided on only one side of the workpiece W has been described, but the present invention is not limited to such a case. In the example shown in FIG. 7, another conductive plate 28 and a conductive rod 30 are provided in addition to the conductive plate 18 and the conductive rod 20.

  In the heat treatment furnace 32 shown in FIG. 7, the tray 34 has a U-shaped cross section. The tray 34 includes a second side surface portion 34c in addition to the bottom surface portion 34a for mounting the work W and the first side surface portion 34b for fixing the conductive plate 18 described above.

  The second side surface portion 34c is provided at a position facing the first side surface portion 34b, and is arranged so as to extend in the vertical direction similarly to the first side surface portion 34b. The conduction plate 28 is fixed to the second side surface 34 c on the side opposite to the side where the work W is inserted into the heat treatment furnace 2. The conductive plate 28 is formed of a metal (for example, chromel and alumel) of the same material as the thermocouple 42 described later, and is a conductive material so as to form a thermocouple with the conductive rod 30 described later. A plurality of thermocouples 42 are electrically connected to the conduction plate 28.

  The conducting rod 30 is fixed to an inner wall surface 36 which is a side wall facing the relay zone 6 among the side walls in the heating zone 4. The inner wall surface 36 may be, for example, a side-opening door 52 for accessing the inside of the heating zone 4 as shown in FIG.

  The conductive rod 30 has a contact end 30a protruding toward the conductive plate. The contact end 30a is made of the same metal (for example, chromel and alumel) as the thermocouple 42 so as to form a thermocouple together with the conduction plate 28, and is made of a conductive material.

  A compensation lead 38 is connected to the contact end 30 a of the conductive rod 30. The compensating lead 38 is electrically connected to a temperature measuring device 40 provided outside the heat treatment furnace 2 separately from the temperature measuring device 24.

  According to such a configuration, even when the tray 34 is separated from the elevator 14 and is disposed in the heating zone 4, the conductive plate 28 is brought into contact with the contact end 30 a of the conductive rod 30. The temperature of the work W can be measured in real time by the temperature measuring device 40 not only in the relay zone 6, the lower cooling zone 8, and the upper cooling zone 10, but also in the heating chamber 4.

  As described above, the work temperature measuring device of the heat treatment furnace 32 shown in FIG. 7 includes the (first) conductive plate 18, the (first) conductive rod 20, and the (first) temperature measuring device 24, It comprises a (second) conducting plate 28, a (second) conducting rod 30 and a (second) temperature measuring device 40. The conduction plate 28 is a plate made of a conductive material fixed to the tray 34 and electrically connected to a (second) thermocouple 42 for measuring the temperature of the work W. The conductive rod 30 is attached to the inner wall surface 36 of the heat treatment furnace 2 and has a contact end 30 a made of a conductive material for contacting the conductive plate 28. The temperature measuring device 40 is provided outside the heat treatment furnace 2, and is electrically connected to the contact end 30 a of the conductive rod 30. Here, the conductive rod 30 electrically connects the conductive plate 28 to the temperature measuring device 40 when the contact end 30a contacts the conductive plate 28.

  According to such a configuration, by providing the conductive plate 28 and the conductive rod 30, even if the tray 34 is away from the elevator 14, if the conductive plate 28 is in a position where it contacts the conductive rod 30, The temperature change of W can be measured in real time.

(Embodiment 2)
A heat treatment furnace 60 according to a second embodiment of the present disclosure will be described. In the second embodiment, the points that are different from the first embodiment will be mainly described. In the second embodiment, the same components as those in the first embodiment will be described with the same reference numerals. In the second embodiment, descriptions overlapping with the first embodiment are omitted.

  FIG. 13 is a block diagram illustrating a schematic configuration of the heat treatment furnace 60 according to the second embodiment of the present disclosure.

  The second embodiment is different from the first embodiment in that a door 52 for carrying the work W into the heat treatment furnace 60 is provided in the relay zone 6.

  As shown in FIG. 13, a side door 52 is provided on one side surface of the relay zone 6 together with a door pocket 72. In such a configuration, the side door 52 is opened, and the work W is placed on the bottom surface 12a of the tray 12 in the relay zone 6 from the side (arrow M1). The side door 52 is closed, the door 5 is opened, and the work W is sent to the heating zone 4 as it is (arrow M2), and the door 5 is closed and heated. Thereafter, the door 5 is opened, and the work W is returned to the relay zone 6 (arrow M3). Then, the door 5 is closed, the work W is lowered or raised, and after the quenching process is performed in the lower cooling zone 8 or the upper cooling zone 10, the work W is raised or lowered and returned to the relay zone 6. Thereafter, the side door 52 is opened, and the work W is taken out of the heat treatment furnace 60 (arrow M4).

  Even with such a configuration, similarly to the heat treatment furnace 2 of the first embodiment, the temperature change of the work W during the heat treatment can be measured in real time with a configuration that does not hinder the movement of the work W.

  Note that by appropriately combining any of the various embodiments described above, the effects of the respective embodiments can be achieved.

  Although the present disclosure has been fully described in connection with preferred embodiments with reference to the accompanying drawings, various variations and modifications will be apparent to those skilled in the art. It is to be understood that such changes and modifications are included therein unless they depart from the scope of the present disclosure as set forth in the appended claims. In addition, combinations of elements and changes in the order in each embodiment can be realized without departing from the scope and spirit of the present disclosure.

  INDUSTRIAL APPLICABILITY The present disclosure is applicable to any work temperature measuring device for measuring the temperature of a work disposed inside a housing such as a heat treatment furnace, and any heat treatment furnace including the same.

2, 60 Heat treatment furnace 4 Heating zone 5, 51, 52 Door 5a Opening 5b Chain 5c Lifting mechanism 51 Door 51a Opening 51b Chain 51c Lifting mechanism 6 Relay zone 7 Door pocket 71, 72 Door pocket 8 Lower cooling zone 10 Upper cooling zone 12 Tray 12a Bottom part 12b Side surface part 14 Elevating elevator 14a Bottom part 14b Side surface part 14c Projection 16 Elevating mechanism 17 Holding arm 18 (First) conduction plate 18a Insulation plate 18b Connection part 20 (First) conduction rod 20a Contact end part 20b Weight 20c Plate 20d Rotary Axis 20e Insulated Push 22 (First) Thermocouple 24 (First) Temperature Measuring Device 26 (First) Compensating Conductor 28 (Second) Conducting Plate 30 (Second) Conducting Rod 30a Contact end 32 Heat treatment furnace 34 Tray 34a Bottom part 4b first side portion 34c second side portions 36 within the wall 38 (second) compensating lead wire 40 (second) temperature measuring apparatus 42 (second) thermocouple W workpiece S own weight P measurement point

Claims (7)

A work temperature measuring device for measuring the temperature of a work arranged inside the housing,
A first conductive plate of a conductive material fixed to a tray for mounting and transporting the work, and electrically connected to a first thermocouple for measuring the temperature of the work;
A first conductive rod attached to a lift elevator for mounting and lowering the tray and having a contact end made of a conductive material for contacting the first conductive plate;
A first temperature measuring device provided outside the housing and electrically connected to the contact end of the first conductive rod;
The contact end of the first conductive rod and the first conductive plate are provided two by two, and the contact end of the first conductive rod and one of the first conductive plates contacting each other. A pair is made of the same type of metal and connected to the wiring of the first thermocouple made of the same type of metal, and each pair is made of a different type of metal ;
The first conductive plate is exposed in an approach direction in which the tray enters the zone in which the elevator is housed, and the contact end of the first conductive rod projects in a direction opposite to the approach direction. A work temperature measuring device. A work temperature measuring device for measuring the temperature of a work arranged inside the housing,
A first conductive plate of a conductive material fixed to a tray for mounting and transporting the work, and electrically connected to a first thermocouple for measuring the temperature of the work;
A first conductive rod attached to an inner wall surface of the housing and having a contact end made of a conductive material for contacting the first conductive plate;
A first temperature measuring device provided outside the housing and electrically connected to the contact end of the first conductive rod;
The first conductive plate has a vertical length that maintains contact with the contact end of the first conductive rod at a raised position where the tray is raised by a lifting mechanism for lifting and lowering the tray. And
The contact end of the first conductive rod and the first conductive plate are provided two by two, and the contact end of the first conductive rod and one of the first conductive plates contacting each other. A pair is made of the same type of metal and connected to the wiring of the first thermocouple made of the same type of metal, and each pair is made of a different type of metal ;
The first conductive plate is exposed in an approach direction in which the tray enters the zone in which the lifting mechanism is housed, and the contact end of the first conductive rod projects in a direction opposite to the approach direction. A work temperature measuring device. A work temperature measuring device for measuring the temperature of a work arranged inside the housing,
A first conductive plate of a conductive material fixed to a tray for mounting and transporting the work, and electrically connected to a first thermocouple for measuring the temperature of the work;
A first conductive rod attached to a lift elevator for mounting and lowering the tray and having a contact end made of a conductive material for contacting the first conductive plate;
A first temperature measuring device provided outside the housing and electrically connected to the contact end of the first conductive rod;
The first conductive plate is vertically moved to maintain contact with the contact end of the first conductive rod at a raised position where the tray is lifted from the lift elevator by a lift mechanism different from the lift elevator. Has a length,
The contact end of the first conductive rod and the first conductive plate are provided two by two, and the contact end of the first conductive rod and one of the first conductive plates contacting each other. A pair is made of the same type of metal and connected to the wiring of the first thermocouple made of the same type of metal, and each pair is made of a different type of metal ;
The first conductive plate is exposed in an approach direction in which the tray enters a zone in which the elevator and the elevator mechanism are accommodated, and the contact end of the first conductive rod is configured to be in the approach direction. A work temperature measuring device that projects in the opposite direction . The first conductive rod includes a biasing unit that biases the contact end in a direction of pressing the contact end against the first conductive plate,
The urging portion is a weight attached so as to be rotatable integrally with the contact end portion,
When the contact end is in contact with the first conductive plate, the biasing portion urges the contact end to rotate in a direction of pressing the contact end against the first conductive plate by its own weight. 4. The work temperature measuring device according to any one of 1 to 3. A second conductive plate of a conductive material fixed to the tray and electrically connected to a second thermocouple for measuring the temperature of the work;
A second conductive rod attached to the inner wall surface of the heat treatment furnace and having a contact end made of a conductive material for contacting the second conductive plate;
A second temperature measuring device provided outside the heat treatment furnace and electrically connected to the contact end of the second conductive rod;
The second conductive rod electrically connects the second conductive plate to the second temperature measuring device when the contact end contacts the second conductive plate;
The contact end of the second conductive rod and the second conductive plate are provided two by two, and the contact end of the second conductive rod and one of the second conductive plates that are in contact with each other are provided. 5. The semiconductor device according to claim 1, wherein the sets are made of the same kind of metal, connected to the wiring of the second thermocouple made of the same kind of metal, and each set is made of a different kind of metal. 2. The work temperature measuring device according to 1.   It is a heat treatment furnace which performs temperature measurement of the said workpiece | work using the said workpiece | work temperature measurement apparatus as described in any one of Claims 1-5, Comprising: The said workpiece | work temperature measurement apparatus, the said tray, the said elevator, and / or A heat treatment furnace comprising the lifting mechanism. A heating zone for heating the work, a relay zone provided on the side of the heating zone, and a lower portion provided below and above the relay zone for cooling the work heated in the heating zone. The heat treatment furnace according to claim 6, comprising a cooling zone and an upper cooling zone,
The tray mounts and transports the work between the heating zone and the relay zone,
The elevating elevator places the tray between the relay zone and the lower cooling zone and moves up and down,
The heat treatment furnace, wherein the lifting mechanism lifts and lowers the tray between the relay zone and the upper cooling zone independently of lifting and lowering by the lifting elevator.

Images