JP2018091658A - Workpiece temperature measuring device and heat treatment furnace including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a workpiece temperature measuring device capable of measuring a workpiece temperature in real time in a configuration in which workpiece movement is not hindered, and a heat treatment furnace including the same.SOLUTION: A workpiece temperature measuring device for measuring a temperature of a workpiece arranged inside a housing comprises: a first conducting plate of a conductive material fixed to a tray for placing and transporting a workpiece and electrically connected to a first thermocouple for measuring the workpiece temperature; a first conducting rod attached to an elevator for placing and elevating the tray and including a contact end part of a conductive material for contact with the first conducting plate; and a first temperature measuring device provided outside the housing and electrically connected to the contact end part of the first conducting rod. The first conducting plate has a vertical length for maintaining a contact with the contact end part of the first conducting rod in an elevated position in which the tray is elevated from the elevator by an elevating mechanism different from the elevator.SELECTED DRAWING: Figure 1

Description

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

  Some industrial furnaces not only transport workpieces in the horizontal direction but also move them up and down. As one of such industrial furnaces, there is a heat treatment furnace, for example, there is a quenching apparatus provided with an oil cooling zone below a heating zone for heat-treating a workpiece and a gas cooling zone above (for example, Patent Documents). 1).

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

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

  However, in the configuration as in Patent Document 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 real-time measurement cannot be performed.

  In order to measure the temperature of the workpiece in real time, for example, as in Patent Document 3, a thermocouple is provided at the tip of a lifting pin for raising and lowering the workpiece, and the temperature of the workpiece is adjusted by bringing the thermocouple into contact with the workpiece. Some measure. However, in the configuration as in Patent Document 3, since the temperature of the workpiece cannot be measured when the workpiece is separated from the tip of the lifting pin, the measurement is limited.

  For example, as in Patent Document 4, there is a type in which a compensation lead wire (wiring type thermocouple) is introduced from the outside. In the configuration of Patent Document 4, a sensor unit is fixed to a tray for conveying a workpiece, and a compensation lead wire is connected to the sensor unit, and the compensation lead wire can be wound in a furnace. However, in such a configuration, since the compensation lead wire needs to be routed in the furnace, the movement of the tray on which the workpiece is placed may be hindered by the compensation lead wire.

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

  A workpiece temperature measurement device according to an aspect of the present disclosure is a workpiece temperature measurement device for measuring the temperature of a workpiece arranged in a housing, and is mounted on a tray for placing and transporting the workpiece. A first conductive plate that is fixed and electrically connected to a first thermocouple for measuring the temperature of the workpiece, and attached to a lift elevator for mounting and lifting the tray. A first conductive rod having a contact end portion made of a conductive material for contacting the first conductive plate; and provided on the outside of the housing and electrically connected to the contact end portion of the first conductive rod. And a first temperature measuring device connected to the workpiece temperature measuring device.

  According to the said structure, the temperature of a workpiece | work can be measured more in real time by the structure which does not prevent the movement of a workpiece | work.

  A workpiece temperature measurement device according to an aspect of the present disclosure is a workpiece temperature measurement device for measuring the temperature of a workpiece arranged in a housing, and is mounted on a tray for placing and transporting the workpiece. A first conductive plate that is fixed and electrically connected to a first thermocouple for measuring the temperature of the workpiece; and a first conductive plate that is attached to an inner wall surface of the housing; and A first conductive rod having a contact end portion of a conductive material for contact; and a first conductive rod provided outside the housing and electrically connected to the contact end portion of the first conductive rod. A temperature measuring device, wherein the first conductive plate is in contact with the contact end of the first conductive rod at a raised position where the tray is lifted by a lifting mechanism for lifting and lowering the tray. Have a vertical length to maintain, A chromatography peak temperature measuring device.

  According to the said structure, the temperature of a workpiece | work can be measured more in real time by the structure which does not prevent the movement of a workpiece | work even if a workpiece | work is moved with an raising / lowering mechanism.

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

  According to the said structure, the temperature of a workpiece | work can be measured more in real time by the structure which does not prevent the movement of a workpiece | work even if it moves a workpiece | work with a raising / lowering elevator.

  In the workpiece temperature measuring device, the first conductive rod includes a biasing portion that biases the contact end portion in a direction of pressing the contact end portion against the first conductive plate, and the biasing portion includes the contact end portion and the contact end portion. A weight attached to the lift elevator so as to be integrally rotatable, and when the contact end portion is in contact with the first conductive plate, the biasing portion is caused by its own weight to cause the contact end The portion may be rotationally biased in a direction in which the portion is pressed against the first conduction plate. Thereby, the contact state of a 1st conduction | electrical_connection rod and a 1st conduction | electrical_connection plate can be ensured more reliably, and the reliability of temperature measurement can be improved. In addition, the urging unit can be realized with a simple configuration.

  In the workpiece temperature measuring device, a second conductive plate made of a conductive material fixed to the tray and electrically connected to a second thermocouple for measuring the temperature of the workpiece, and an inner wall surface of the heat treatment furnace A second conducting rod attached and having a contact end made of a conductive material for contacting the second conducting plate; and the contact end of the second conducting rod provided outside the heat treatment furnace. A second temperature measuring device electrically connected to the second conductive rod, wherein the second conductive rod is configured to displace the second conductive plate when the contact end contacts the second conductive plate. You may electrically connect to the second temperature measuring device. Thereby, even if the tray is away from the elevator, the temperature of the workpiece can be measured in real time as long as the second conductive plate is in a position in contact with the second conductive rod.

  A heat treatment furnace according to an aspect of the present disclosure is a heat treatment furnace that performs temperature measurement of the workpiece using the workpiece temperature measurement device, the workpiece temperature measurement device, the tray, the lift elevator, and / or the lift mechanism. And a heat treatment furnace. According to the said structure, the temperature of a workpiece | work can be measured in real time by the structure which does not prevent the movement of a workpiece | work.

  In the heat treatment furnace, a heating zone for heat-treating the workpiece, a relay zone provided on a side of the heating zone, and the workpiece that is provided below and above the relay zone and is heat-treated in the heating zone. The tray includes a lower cooling zone and an upper cooling zone for cooling the tray, and the tray places and conveys the workpiece between the heating zone and the relay zone, and the lift elevator includes the relay zone and the lower zone. The tray may be placed between the cooling zones to move up and down, and the lifting mechanism may raise and lower the tray between the relay zone and the upper cooling zone independently of the lifting by the lifting elevator. According to such a configuration, even when the workpiece is in the relay zone, when moving downward from the relay zone, or when moving upward from the relay zone, the temperature of the workpiece placed on the tray is measured in real time. be able to.

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

The figure which shows schematic structure of the heat processing furnace and workpiece | work temperature measuring apparatus in Embodiment 1. Schematic for explaining operation examples of heat treatment furnace and workpiece temperature measuring device Schematic for explaining operation examples of heat treatment furnace and workpiece temperature measuring device Schematic for explaining operation examples of heat treatment furnace and workpiece temperature measuring device Schematic for explaining operation examples of heat treatment furnace and workpiece temperature measuring device Enlarged perspective view of conducting rod and conducting plate Schematic showing the first rotational position of the conducting rod Schematic showing the second rotational position of the conducting rod The figure which shows schematic structure of the heat processing furnace and workpiece | work temperature measuring apparatus in the modification of Embodiment 1. The figure which shows the motion of a raising / lowering mechanism and a holding | grip arm (AA arrow line view of FIG. 1) Perspective view showing a plurality of conducting rods attached to the elevator The figure which shows the some conduction | electrical_connection plate attached to the side part of a tray (BB arrow line view of FIG. 1) The figure which shows the form by which only an upper cooling chamber is provided as a cooling chamber The figure which shows the form by which only a lower cooling chamber is provided as a cooling chamber The figure which shows schematic structure of the heat processing furnace in Embodiment 2 (The top view which shows the operation | movement of another form which changed arrangement | positioning of a door)

  Hereinafter, preferred embodiments of a heat treatment furnace (housing) and a workpiece 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, and configurations based on the same technical idea are included in the present disclosure.

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

  As shown in FIG. 1, a 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 a lift 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 conductor 26.

  The heat treatment furnace 2 shown in FIG. 1 heats the workpiece W in the heating zone 4, horizontally transports the heated workpiece W to the relay zone 6, and then lowers or lifts the workpiece W to the lower cooling zone 8 by the elevator 14. The temperature is raised to the upper cooling zone 10 by 16 to perform a cooling process.

  In particular, the present disclosure has a conductive plate 18 on the tray 12 and a conductive rod 20 on the lift elevator 14. The conduction plate 18 and the conduction rod 20 are brought into contact with each other, thereby electrically connecting the thermocouple 22 connected to the conduction plate 18 and the temperature measuring device 24 connected to the conduction rod 20. With such a configuration, even when the workpiece W is in the relay zone 6 or moves downward or upward from the relay zone 6, the contact between the conduction plate 18 and the conduction rod 20 is ensured to be conducted, whereby the heat treatment furnace 2. The temperature of the workpiece W arranged 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 described above is composed of a conduction plate 18, a conduction rod 20, a thermocouple 22, a temperature measuring device 24, and a compensating conductor 26.

  Hereinafter, each component of the heat treatment furnace 2 and the workpiece temperature measuring device will be described.

  The heating zone 4 is a space for heating the workpiece W. The heating zone 4 heats the workpiece W to a predetermined temperature (for example, 1350 ° C.) in a vacuum or a reduced-pressure atmosphere of atmospheric pressure or lower. FIG. 1 illustrates a state in which the workpiece W is arranged not in the heating zone 4 but in the relay zone 6.

  The relay zone 6 is a space provided on the side of the heating zone 4. An opening 5a is provided on the wall surface between the relay zone 6 and the heating zone 4, and a door 5 is provided to close each space so as to be able to be sealed. A door pocket 7 for storing the door 5 is provided above the opening 5a. The door 5 is suspended from above the door pocket 7 by a chain 5b or the like, and the chain 5b is wound up by an elevating mechanism 5c from the outside, and is raised and lowered by sending it 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 integral space continuous to the relay zone 6. An opening 51 a is also provided on the wall surface between the heating zone 4 and the outside and can be opened and closed by the door 51. The door 51 is lifted and lowered by the chain 51b and the lifting mechanism 51c in the same manner as the door 5 described above.

  The lower cooling zone 8 is a space for cooling the workpiece 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 workpiece W is immersed in oil in the lower cooling zone 8, whereby the workpiece W is cooled and quenched.

The upper cooling zone 10 is a space for cooling the workpiece 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 can cool a predetermined temperature (for example, room temperature) cooling gas (for example, N ₂ (150 kPa (abs))). It is configured. By blowing the cooling gas into the upper cooling zone 10 with the workpiece W placed in the upper cooling zone 10, the workpiece W is cooled and quenched.

  The oil-cooled cooling process has a higher cooling rate than the gas-cooled cooling process. Therefore, in consideration of the material characteristics desired for each type of workpiece W, it is possible to select either or both of the cooling process in the lower cooling zone 8 and the cooling process in the upper cooling zone 10.

  The tray 12 is a member for placing and transporting the workpiece W in the heat treatment furnace 2. The tray 12 supports the workpiece W from below when the workpiece W is in the heating zone 4, the relay zone 6, the lower cooling zone 8, and the upper cooling zone 10 and when moving in these 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 surface portion 12a extending in the horizontal direction and a side surface portion 12b extending in the vertical direction. The bottom surface portion 12a constitutes a bottom surface on which the workpiece W is placed. The side surface portion 12b constitutes a side surface for fixing a conduction plate 18 described later.

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

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

  The 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 elevator 14 is moved up and down by an elevator mechanism (not shown).

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

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

  A compensating conductor 26 is electrically connected to the contact end 20a. The compensating conductor 26 is made 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 20 a is connected to the temperature measuring device 24 through the compensation lead wire 26.

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

  The elevating mechanism 16 is an elevating mechanism for elevating the tray 12 on which the work W is placed, separately from the elevating 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 the elevating by the elevating elevator 14. For example, the lifting mechanism 16 is configured by a gripping arm capable of gripping the tray 12, and by lifting the gripped tray 12 from the bottom surface portion 14 a of the lifting 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 four arms 17 (only the two on the near side are shown in FIG. 8) are opened from the fixed position (FIG. 8A) (FIG. 8B). . Thereafter, 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 ascends in that state (FIG. 8D).

  Returning to FIG. 1, the thermocouple 22 is a wired thermocouple used to electrically connect the workpiece 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 workpiece W and the conduction plate 18. In FIG. 1, the contact points at the tips of the three thermocouples 22 are attached to the measurement point 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 (contact end 20 a), and the compensation lead wire 26.

  The temperature measuring device 24 is a temperature measuring device for measuring the temperature of the workpiece W with a thermocouple. As shown in FIG. 1, the temperature measuring device 24 is electrically connected to the contact end portion 20 a of the conducting rod 20 through a compensation lead wire 26. The temperature measuring device 24 is electrically connected to the workpiece W via the compensating conductor 26, the contact end 20 a of the conducting rod 20, the conducting plate 18, and the thermocouple 22, so that the workpiece placed on the tray 12. The temperature of the W measurement point P can be measured.

  The compensation conductor 26 is a compensation conductor for electrically connecting the contact end 20 a of the conducting rod 20 and the temperature measuring device 24. The compensation lead wire 26 according to the first embodiment is configured by a compensation lead wire (for example, one wound in a coil shape) that can be expanded and contracted. For this reason, even when the elevating elevator 14 is lowered, electrical connection with the contact end portion 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 workpiece W is carried into the heating chamber 4 as shown in FIG. Specifically, the door 51 is raised and opened, and the workpiece W placed on the bottom surface portion 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 workpiece 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 placed is driven to rotate from the outside.

Next, the workpiece W is heat-treated. Specifically, in a state where the heating zone 4 is sealed by the door 5 and the door 51, the heating zone 4 is evacuated or reduced in pressure, and then a predetermined heating gas (for example, N ₂ gas) is introduced. Thereby, the workpiece | work W in the heating zone 4 is heated to predetermined temperature (for example, 1200 degreeC).

  Next, the tray 12 is moved to the relay zone 6. Specifically, the door 5 is raised and opened, and the workpiece W heated in the heating zone 4 is moved horizontally from the opening 5 a toward the relay zone 6. For the movement of the tray 12, the aforementioned transport mechanism (not shown) is used. Thereby, as shown in FIG. 3, the tray 12 and the workpiece | work W are arrange | positioned in the relay zone 6 provided in 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 conveyed to the relay zone 6 is placed on the bottom surface 14 a of the lift elevator 14. At this time, the conduction plate 18 fixed to the tray 12 and the contact end portion 20a of the conduction rod 20 attached to the lift elevator 14 come into contact with each other. As a result, the workpiece W and the temperature measuring device 24 are electrically connected via the thermocouple 22, the conducting plate 18, the contact end portion 20 a of the conducting rod 20, and the compensation conducting wire 26. The temperature of the workpiece W can be measured.

  According to the above method, since it is a contact-type temperature measurement method by contact between the conduction plate 18 and the conduction rod 20, it is compared with a case where an electrical connection is made with a compensation conductor or the like instead of the conduction plate 18 and the conduction rod 20. The tray 12 can be configured 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 in the lower cooling zone 8 and / or the cooling process in the upper cooling zone 10 is selected according to the desired material characteristics of the workpiece W.

  As an 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 workpiece W is placed is lowered integrally by lowering the elevator 14. Accordingly, the tray 12 is disposed in the lower cooling zone 8, and the workpiece W placed on the tray 12 is immersed in the cooling oil in the lower cooling zone 8. The workpiece W is cooled by being immersed in the cooling oil in the lower cooling zone 8 and quenched.

  As the elevator 14 is lowered, the compensation conductor 26 is also extended and extended. By configuring the compensating lead wire 26 in a telescopic manner in this way, the electrical connection between the contact end portion 20a and the temperature measuring device 24 is stably secured even when the elevator elevator 14 is lowered. In the state before moving to the lower cooling zone 8 (the state shown in FIG. 3), the compensation lead wire 26 is contracted, so that the conveyance of the tray 12 can be prevented.

  As shown in FIG. 4A, even when the tray 12 and the workpiece W are lowered to the lower cooling zone 8, the contact state between the conduction plate 18 and the contact end portion 20 a is ensured. It is in a state where the temperature of can be measured. In such a contact state, while the conduction plate 18 is fixed to the tray 12, the contact end portion 20a is attached to the elevator 14 on which the tray 12 is placed, and the conduction plate 18 and the contact end portion 20a are brought into contact with each other. Can be secured. As a result, the temperature of the workpiece W can be measured in real time while descending 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 workpiece W is placed is lifted from the bottom surface portion 14 a of the lift elevator 14 by driving the lift mechanism 16. Let At this time, the conduction plate 18 of the tray 12 slides and rises while maintaining a contact state with the contact end portion 20a. In order to make the sliding smooth, a roller (not shown) of the same material may be attached to the contact end portion 20a.

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

  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 portion 20a is ensured. In such a contact state, the conduction plate 18 fixed to the tray 12 has a vertical length that can maintain contact with the contact end portion 20a of the conduction rod 20 even when the tray 12 is in the raised position by the elevating mechanism 16. This can be ensured. As a result, the temperature of the workpiece W can be measured in real time while rising from the relay zone 6 to the upper cooling zone 10 and while being cooled in the upper cooling zone 10.

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

  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 workpiece temperature measuring apparatus according to the first embodiment is a workpiece temperature measuring apparatus for measuring the temperature of a workpiece W arranged inside the heat treatment furnace 2 (housing), and is a (first) conduction plate 18. And a (first) conducting rod 20 and a (first) temperature measuring device 24. The conductive plate 18 is fixed to the tray 12 on which the work W is placed and conveyed, and is 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 conducting rod 20 is attached to a lift elevator 14 for moving the tray 12 up and down, and a contact end of a conductive material (the same material as the thermocouple 22 in the first embodiment) for contacting the conduction plate 18. Part 20a. The temperature measuring device 24 is a measuring device that is provided outside the heat treatment furnace 2 and is electrically connected to the contact end 20 a of the conducting rod 20. The conduction plate 18 has a vertical length that maintains contact with the contact end portion 20 a of the conduction rod 20 at the raised position where the tray 12 is lifted from the lift elevator 14 by a lift mechanism 16 different from the lift elevator 14.

  According to such a configuration, the temperature of the workpiece W can be measured by electrically connecting the thermocouple 22 to the temperature measuring device 24 by the contact between the conduction plate 18 and the conduction rod 20. For this reason, when the tray 12 is placed on the elevator 14, the temperature of the workpiece W placed on the tray 12 can be measured in real time. Further, since the conduction plate 18 has a vertical length that maintains contact with the contact end 20a even at the raised position where the tray 12 is raised, the tray 12 can be used even when the tray 12 is lifted from the lift elevator 14 or while being raised. 12 can measure the temperature of the workpiece W placed on the head 12 in real time.

  Further, since the contact-type temperature measurement is such that electrical connection is ensured by contact between the conduction plate 18 and the conduction rod 20, the tray 12 is different from the case where a compensation lead wire is provided between the tray 12 and the lift elevator 14. In addition, the workpiece W can be moved smoothly without hindering the movement of the workpiece W. In this way, the temperature of the workpiece W can be measured in real time with a configuration that does not hinder the movement of the workpiece W.

  Further, according to the workpiece temperature measuring apparatus of the first embodiment, the compensating conductor 26 that electrically connects the contact end portion 20a of the conducting rod 20 and the temperature measuring device 24 is wound in a spiral shape, for example, and can be expanded and contracted. Is done.

  According to the above configuration, the compensation conductor 26 is configured to be expandable and contractible, so that the electrical connection between the contact end portion 20a and the temperature measuring device 24 by the compensation conductor 26 is ensured even when the elevator elevator 14 is lowered. 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. The elevating elevator 14 and the elevating mechanism 16 are further provided.

  According to such a configuration, since the workpiece temperature measuring device described above is provided, the temperature of the workpiece W can be measured in real time with a configuration that does not hinder the movement of the workpiece 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 constitutes a space for heating the workpiece W. The relay zone 6 constitutes a space provided on the side of the heating zone 4. The lower cooling zone 8 and the upper cooling zone 10 constitute spaces provided below and above the relay zone 6, and cool the workpiece W heated in the heating zone 4. The tray 12 places and conveys the workpiece W between the heating zone 4 and the relay zone 6. The elevator 14 moves up and down with the tray 12 placed between the relay zone 6 and the lower cooling zone 8. The elevating mechanism 16 elevates the tray 12 between the relay zone 6 and the upper cooling zone 10 independently of the elevating by the elevating elevator 14.

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

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

  Although only one conducting rod 20 is shown in FIGS. 5, 6 </ b> A, and 6 </ b> B, actually, a plurality of conducting rods 20 are attached to the side surface portion 12 b 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 a thermocouple for each of the measurement points P (in FIG. 1, two thermocouples 22 are one. Are collectively shown in the figure). Therefore, as shown in FIG. 9, six conducting rods 20 are attached to the side surface portion 14 b of the lift elevator 14 side by side. Also, as shown in FIG. 10, six conducting plates 18 are attached to the side surface portion 12 b of the tray 12 side by side at positions corresponding to the six conducting rods 20.

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

  The conducting rod 20 that is in contact with the conducting plate 18 is a mechanism that is rotatably attached to the side surface portion 14 b of the lift elevator 14. Specifically, the conduction rod 20 is configured 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 in which the contact end portion 20a is pressed against the conduction plate 18, as will be described later. The compensating lead wire 26 described above is connected to the contact end portion 20a. Further, the contact end portion 20a and the plate 20c are electrically insulated by an insulating push 20e. The material of the contact end 20a is the same as that used for the thermocouple 22.

  As for the plate 20c, the rotating shaft 20d is penetrated by the bending part used as the rotation center. The rotating shaft 20d is a rod-like protrusion fixed to the side surface portion 14b of the lift elevator 14, and the plate 20c is configured to be rotatable about the rotating shaft 20d.

  Further, a projection 14c is fixed to the side surface portion 14b of the elevator 14 as a stopper for restricting the rotational position of the plate 20c. These 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 20c of the conductive rod 20 is stationary with the weight S of the weight 20b in contact with the protrusion 14c (first Rotation position).

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

  In the second rotational position shown in FIG. 6B, the weight 20 b rotates and urges the plate 20 c in the direction D that presses the contact end portion 20 a against the conduction plate 18 by its own weight S. With such a configuration, the contact between the contact end portion 20a and the conduction plate 18 can be more reliably ensured, and vibrations and positional deviations during transport of the tray 12 can be dealt with. Further, by using the weight S of the weight 20b as the urging portion that urges the contact end portion 20a, the urging portion can be realized with a simple configuration.

  The invention of the present disclosure has been described with reference to the above-described first embodiment. However, the invention of the present disclosure is not limited to the above-described first embodiment. For example, in the first embodiment, the case where the lower cooling zone 8 and the upper cooling zone 10 are provided as the cooling zones for cooling the workpiece W has been described. However, 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. 12 may be used. Moreover, what has the objectives other than cooling (for example, heating zones from which temperature differs) may be provided above and below.

  In the first embodiment, the heat treatment furnace 2 which is a kind of industrial furnace has been described as an example of the casing. Is possible. Even in such a case, the temperature change of the workpiece W in the housing can be measured in real time by providing the conducting rod and the conducting plate in the housing in which the workpiece W is disposed, as in the first embodiment. Can be measured.

  Moreover, in the said Embodiment 1, as shown to FIG. 9, FIG. 10, the some conduction | electrical_connection plate 18 and the some conduction | electrical_connection rod 20 were arranged side by side, respectively, but when the height to raise is not so high, May be arranged vertically. Then, many measurement points can be measured.

  Moreover, although the said Embodiment 1 demonstrated the case where the weight 20b was provided as an urging | biasing part which urges | biases the contact end part 20a, it is not restricted to such a case, The case where an urging | biasing part is not provided may be sufficient ( For example, a structure in which the conducting rod and the contact end portion are fixed to the elevator 14 in a state where the connecting rod and the contact end cannot rotate).

  Moreover, although the said Embodiment 1 demonstrated the case where the biasing part which biases the contact end part 20a was the weight 20b which can rotate integrally with the contact end part 20a, it is not restricted to such a case. Any urging portion may be used as long as it urges the contact end portion 20a in the direction in which the contact end portion 20a is pressed against the conduction plate 18. For example, the contact end portion 20a may be pressed against the conduction plate 18 by a spring. Such a configuration is effective in the case where the inside of the heating chamber 4 is at a high temperature and the spring does not lose its elasticity due to thermal expansion.

  Moreover, although the said Embodiment 1 demonstrated the case where the conduction | electrical_connection plate 18 and the conduction | electrical_connection rod 20 were provided only in the one side of the workpiece | work W, it is not restricted to such a case. In the example shown in FIG. 7, in addition to the conduction plate 18 and the conduction rod 20, another conduction plate 28 and a conduction rod 30 are provided.

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

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

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

  A compensating lead wire 38 is connected to the contact end 30 a of the conducting rod 30. The compensating conductor 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 lift elevator 14 and disposed in the heating zone 4, the conductive plate 28 is in contact with the contact end 30 a of the conductive rod 30. The temperature of the workpiece 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 workpiece temperature measuring device of the heat treatment furnace 32 shown in FIG. 7 includes (first) conduction plate 18, (first) conduction rod 20, and (first) temperature measuring device 24 in addition to ( A second) conducting plate 28, a (second) conducting rod 30 and a (second) temperature measuring device 40 are provided. The conduction plate 28 is a plate made of a conductive material fixed to the tray 34 and electrically connected to the (second) thermocouple 42 for measuring the temperature of the workpiece W. The conduction rod 30 is attached to the inner wall surface 36 of the heat treatment furnace 2 and has a contact end portion 30 a made of a conductive material for contacting the conduction 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 conduction rod 30. Here, the conduction rod 30 electrically connects the conduction plate 28 to the temperature measuring device 40 when the contact end portion 30 a contacts the conduction plate 28.

  According to such a configuration, the conductive plate 28 and the conductive rod 30 are provided, so that even if the tray 34 is separated from the elevator 14, the work plate 28 is in a position where the conductive plate 28 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 the second embodiment of the present disclosure will be described. In the second embodiment, differences from the first embodiment will be mainly described. In the second embodiment, the same or equivalent components as those in the first embodiment will be described with the same reference numerals. In the second embodiment, descriptions overlapping with those in 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 workpiece W into the heat treatment furnace 60 is provided in the relay zone 6.

  As shown in FIG. 13, a side door 52 and a door pocket 72 are provided on one side surface of the relay zone 6. In such a configuration, the side door 52 is opened, and the workpiece W is placed from the side on the bottom surface portion 12a of the tray 12 in the relay zone 6 (arrow M1). The side door 52 is closed, the door 5 is opened, the workpiece 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 workpiece W is returned to the relay zone 6 (arrow M3). Then, the door 5 is closed, the workpiece W is lowered or raised, and after quenching in the lower cooling zone 8 or the upper cooling zone 10, the workpiece W is raised or lowered and returned to the relay zone 6. Thereafter, the side door 52 is opened, and the workpiece 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 workpiece W during the heat treatment can be measured in real time with a configuration that does not prevent the movement of the workpiece W.

  It is to be noted that, by appropriately combining arbitrary embodiments of the various embodiments described above, the effects possessed by them can be produced.

  While 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. Such changes and modifications are to be understood as included within 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.

  The present disclosure is applicable to any workpiece temperature measuring device for measuring the temperature of a workpiece arranged inside a housing such as a heat treatment furnace and a heat treatment furnace including the workpiece temperature measurement device.

2, 60 Heat treatment furnace 4 Heating zone 5, 51, 52 Door 5a Open 5b Chain 5c Lifting mechanism 51 Door 51a Open 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 part 14 Lifting elevator 14a Bottom part 14b Side part 14c Protrusion 16 Lifting mechanism 17 Holding arm 18 (First) conduction plate 18a Insulating plate 18b Connection part 20 (First) conduction rod 20a Contact end 20b Weight 20c plate 20d rotating shaft 20e insulation push 22 (first) thermocouple 24 (first) temperature measuring device 26 (first) compensation wire 28 (second) conduction plate 30 (second) conduction rod 30a Contact end 32 Heat treatment furnace 34 Tray 34a Bottom 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 workpiece temperature measuring device for measuring the temperature of a workpiece arranged inside a housing,
A first conductive plate fixed to a tray for placing and transporting the workpiece and electrically connected to a first thermocouple for measuring the temperature of the workpiece;
A first conductive rod attached to a lift elevator for placing and lifting the tray and having a contact end portion of a conductive material for contacting the first conductive plate;
And a first temperature measuring device provided outside the housing and electrically connected to the contact end of the first conducting rod. A workpiece temperature measuring device for measuring the temperature of a workpiece arranged inside a housing,
A first conductive plate fixed to a tray for placing and transporting the workpiece and electrically connected to a first thermocouple for measuring the temperature of the workpiece;
A first conductive rod attached to an inner wall surface of the housing and having a contact end portion 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 conducting rod;
The first conductive plate has a vertical length that maintains contact with the contact end portion of the first conductive rod at a raised position where the tray is lifted by a lifting mechanism for lifting and lowering the tray. , Work temperature measuring device. A workpiece temperature measuring device for measuring the temperature of a workpiece arranged inside a housing,
A first conductive plate fixed to a tray for placing and transporting the workpiece and electrically connected to a first thermocouple for measuring the temperature of the workpiece;
A first conductive rod attached to a lift elevator for placing and lifting the tray and having a contact end portion 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 conducting rod;
The first conductive plate is vertically moved to maintain contact with the contact end portion 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. A workpiece temperature measuring device having a length. The first conductive rod includes a biasing portion that biases the contact end portion in a direction in which the contact end portion is pressed against the first conductive plate.
The urging portion is a weight attached so as to be rotatable integrally with the contact end portion,
The biasing portion rotationally biases the contact end portion in a direction of pressing the contact end portion against the first conduction plate by its own weight when the contact end portion is in contact with the first conduction plate. The workpiece temperature measuring apparatus according to any one of 1 to 3. A second conductive plate made of a conductive material fixed to the tray and electrically connected to a second thermocouple for measuring the temperature of the workpiece;
A second conducting 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 conducting plate;
A second temperature measuring device provided outside the heat treatment furnace and electrically connected to the contact end of the second conducting rod;
The second conductive rod electrically connects the second conductive plate to the second temperature measuring device when the contact end portion contacts the second conductive plate. 4. The workpiece temperature measuring device according to claim 1.   A heat treatment furnace for measuring the temperature of the workpiece using the workpiece temperature measuring device according to any one of claims 1 to 5, wherein the workpiece temperature measuring device, the tray, the lift elevator and / or A heat treatment furnace comprising the lifting mechanism. A heating zone for heat-treating the workpiece, 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 workpiece heat-treated in the heating zone A heat treatment furnace according to claim 6, comprising a cooling zone and an upper cooling zone,
The tray places and conveys the workpiece between the heating zone and the relay zone,
The elevator is moved up and down by placing the tray between the relay zone and the lower cooling zone,
The elevating mechanism elevates and lowers the tray between the relay zone and the upper cooling zone independently of the elevating and lowering by the elevating elevator.

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