Conveyance system

Abstract

To provide a conveyance system, in a steel member heat treatment apparatus, which performs heat insulation and temperature control of a steel member conveyed to an oil tank, thereby securing reliability of the properties of the steel member after heat treatment.SOLUTION: A conveyance system comprises: a conveyance chamber 3 provided between first chambers 6A, 6B, 7 at least for executing heating treatment to a steel member W and second chambers 8A, 8B, 8C for executing hardening treatment to the steel member W subjected to the heating treatment; and a conveyance apparatus 2 for conveying the steel member W from the first chambers 6A, 6B, 7 to the second chambers 8A, 8B, 8C in the conveyance chamber 3. The conveyance apparatus 2 comprises: a storage part 21 formed as a box-shaped member having a space for storing the steel member W thereinside; first opening parts 22A, 22B through which the steel member W is inserted and removed between the first chambers 6A, 6B, 7 or the second chambers 8A, 8B, 8C, and the storage part 21; and first opening / closing parts 23A, 23B operating so as to open or close the first opening parts 22A, 22B.SELECTED DRAWING: Figure 2A

Description

[Technical field]

[0001] The present invention relates to a transport system provided in a heat treatment device for steel members. [Background technology]

[0002] In the heat treatment of steel members, the steel members are rapidly cooled in an oil bath at high temperatures. This is generally called quenching. By performing quenching, martensite is formed in the steel members, and the hardness of the steel members is increased. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-218655 A Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional heat treatment devices, the temperature of the steel members decreases while they are being transported to the oil tank, which can lead to deterioration of the properties of the steel members after quenching. Therefore, the above-mentioned Patent Document 1 discloses a transport device that transports the steel members to the oil tank while keeping them warm in a chamber.

[0005] However, the transport device disclosed in the above-mentioned Patent Document 1 is unable to adjust the temperature of the steel members, and therefore there is a possibility that the properties of each steel member after heat treatment will vary.

[0006] In view of the above-mentioned problems, the present invention aims to provide a transport system in a heat treatment device that can keep steel components warm and adjust the temperature of the steel components transported to an oil tank, thereby ensuring the reliability of the properties of the steel components after heat treatment. [Means for solving the problem]

[0007] In order to solve the above problem, the conveying system of the present invention comprises a conveying chamber provided between a first chamber in which at least a heat treatment is performed on a steel member and a second chamber in which a hardening treatment is performed on the steel member, and a conveying device in the conveying chamber for conveying the heat-treated steel member from the first chamber to the second chamber, the conveying device comprising a storage section which is a box-shaped member having an internal space for storing the steel member, a first opening through which the steel member is inserted and removed between the first chamber or the second chamber and the storage section, and a first opening / closing section which operates to open or close the first opening.

[0008] In addition, the conveying device further includes a second opening formed in the storage section at a position different from the first opening, and a second opening / closing section that operates to open or close the second opening.

[0009] The second opening is formed in the ceiling of the storage section.

[0010] At least a portion of the storage section, the first opening / closing section, and the second opening / closing section are formed of a heat insulating plate.

[0011] In addition, there are a plurality of the second chambers, and the transport device further includes a control device that controls the operation of the first opening / closing unit and the second opening / closing unit when transporting the steel member for each of the second chambers.

[0012] The system further includes a temperature measuring unit that measures the temperature of the steel material during transport, and a control device that controls the operation of the first opening / closing unit and the second opening / closing unit when transporting the steel material in accordance with the measurement results of the temperature measuring unit. Effect of the Invention

[0013] According to the transport system of the present invention, the steel members transported to the oil tank in the heat treatment device can be kept warm and the temperature can be adjusted, thereby ensuring the reliability of the properties of the steel members after the heat treatment. [Brief description of the drawings]

[0014] [Figure 1]FIG. 1 is a top view illustrating a schematic configuration of a transport system according to an embodiment of the present invention. [Figure 2A] FIG. 2 is a perspective view showing a schematic view of the transport device shown in FIG. 1 (with an opening / closing part in a closed state). [Figure 2B] FIG. 2 is a perspective view showing a schematic view of the transport device shown in FIG. 1 (with an opening / closing section in an open state). [Diagram 3] 2 is a block diagram illustrating an example of a functional configuration of a control device illustrated in FIG. 1. [Figure 4] 2 is a flowchart showing an example of an operation of the transport system shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In order to facilitate understanding of the description, the same components in each drawing are denoted by the same reference numerals as much as possible, and duplicated description will be omitted as appropriate.

[0016] === Implementation form === <Overall composition> FIG. 1 is a top view that diagrammatically illustrates a transfer system 1 according to an embodiment of the present invention (hereinafter, referred to as "the present embodiment").

[0017] 1 includes a transfer system 1, a pre-cleaning tank 5, a first carburizing chamber 6A (first chamber), a second carburizing chamber 6B (first chamber), a temperature-reducing and soaking chamber 7 (first chamber), a first oil tank 8A (second chamber), a second oil tank 8B (second chamber), and a third oil tank 8C (second chamber). The transfer system 1 includes a transfer device 2, a transfer chamber 3, and a control device 4 as main components.

[0018] The pre-cleaning tank 5 is a chamber used for degreasing and drying oil and grease adhering to the steel members W that have been loaded from the outside.

[0019] The first carburizing chamber 6A and the second carburizing chamber 6B are chambers in which the steel member W is heated by a heater (not shown) provided therein and carburizing gas is introduced therein to perform carburizing treatment. The steel member W is heated to, for example, about 930°C in the first carburizing chamber 6A or the second carburizing chamber 6B.

[0020] Although there are two carburizing chambers in Fig. 1, there may be any number of carburizing chambers, however, having multiple carburizing chambers is preferable to having one, since it allows multiple steel members to be carburized in parallel.

[0021] The temperature-reducing and soaking chamber 7 is a chamber in which the steel member W after the carburizing treatment is heated and held at about 850° C. (heating treatment) and subjected to a soaking treatment (temperature-reducing and soaking treatment).

[0022] 1, the first carburizing chamber 6A, the temperature-reducing and soaking chamber 7, and the second carburizing chamber 6B are arranged in this order. Note that the temperature-reducing and soaking chamber 7 may be provided in plural.

[0023] The first oil tank 8A, the second oil tank 8B, and the third oil tank 8C are supplied with heat treatment oil from an oil storage tank (not shown), and the entire steel material W after heat treatment is immersed in the heat treatment oil and rapidly cooled, for example, to about 120°C, thereby performing quenching treatment.

[0024] The first oil vat 8A, the second oil vat 8B, and the third oil vat 8C are arranged in order. The first carburizing chamber 6A, the temperature-reducing and soaking chamber 7, the second carburizing chamber 6B, the first oil vat 8A, the second oil vat 8B, and the third oil vat 8C are arranged in parallel.

[0025] Although three oil tanks are shown in Fig. 1, any number of oil tanks may be used. If there are multiple oil tanks, this is more preferable since multiple steel members can be treated in parallel.

[0026] The transfer chamber 3 is a chamber extending linearly so as to separate the arrangement of the first carburizing chamber 6A, the second carburizing chamber 6B, and the temperature-reducing and soaking chamber 7 from the arrangement of the first oil vat 8A, the second oil vat 8B, and the third oil vat 8C. Rails 15 are laid inside the transfer chamber 3, and a transfer device 2, which will be described later, moves along the rails 15.

[0027] The transfer chamber 3 is equipped with a front door 11 which is controlled to open and close between it and the pre-cleaning tank 5, an inner door 12 which is controlled to open and close between it and the first carburizing chamber 6A and between it and the second carburizing chamber 6B, a temperature-reducing and soaking chamber door 13 which is controlled to open and close between it and the temperature-reducing and soaking chamber 7, a quenching door 14 which is controlled to open and close between it and the first oil vat 8A, between it and the second oil vat 8B and between it and the third oil vat 8C, and a rail 15 along which the transfer device 2 moves. The opening and closing of each door is controlled by a door control device (not shown).

[0028] The transport device 2 moves inside the transport chamber 3 along the rails 15 to transport the steel member W to each chamber. The double-headed dashed arrows shown in FIG. 1 respectively indicate an example of the transport path of the steel members W and the movement path of the transport device 2. The transport device 2 transports, for example, the pre-cleaned steel member W from the pre-cleaning tank 5 to the first carburizing chamber 6A (or the second carburizing chamber 6B). Furthermore, the transport device 2 transports the carburized steel member W from the first carburizing chamber 6A (or the second carburizing chamber 6B) to the temperature-reducing and soaking chamber 7. Furthermore, the transport device 2 transports the heat-treated steel member W from the first carburizing chamber 6A (or the second carburizing chamber 6B) to the first oil vat 8A, the second oil vat 8B, or the third oil vat 8C. Furthermore, the transport device 2 transports the steel member W that has been subjected to the temperature-reducing and soaking treatment from the temperature-reducing and soaking chamber 7 to the first oil vat 8A, the second oil vat 8B, or the third oil vat 8C. Furthermore, the transport device 2 transports the steel member W after the quenching treatment to the pre-cleaning tank 5. Thereafter, the steel member W is taken out from the pre-cleaning tank 5 to the outside.

[0029] During operation of the apparatus, each of the above-mentioned doors is opened when the steel material W is inserted or removed, and is otherwise closed.

[0030] The control device 4 has a processor 16 and a memory 17 (main memory device) as the main parts of its hardware configuration, and controls the opening and closing operations of a first opening and closing section and a second opening and closing section (both described later) in the conveying device 2 when conveying the steel material W.

[0031] <Configuration of the conveying device> FIG. 2A is a perspective view that diagrammatically illustrates the conveying device 2 (closed state) illustrated in FIG. FIG. 2B is a perspective view that diagrammatically illustrates the conveying device 2 (in an open state) illustrated in FIG. As shown in Figures 2A and 2B, the conveying device 2 has as its main parts a storage section 21, a first opening 22A on one side, a first opening 22B on the other side, a first opening / closing section 23A on one side, a first opening / closing section 23B on the other side, a second opening 24, and a second opening / closing section 25.

[0032] The storage section 21 is a box-shaped member having a space therein for storing the steel members W.

[0033] One of the first openings 22A is an opening through which the steel members W are taken in and out between the storage section 21 and each of the first oil vat 8A, the second oil vat 8B, and the third oil vat 8C.

[0034] The other first opening 22B is an opening through which the steel members W are inserted and removed between the storage section 21 and the pre-cleaning tank 5, the first carburizing chamber 6A, the second carburizing chamber 6B and the temperature-reducing / soaking chamber 7, respectively.

[0035] One of the first opening / closing sections 23A operates to open or close one of the first openings 22A (Figures 2A and 2B show the case where the one of the first opening / closing sections 23A is in the form of a horizontal sliding shutter, but the one of the first opening / closing sections 23A may also be in the form of a horizontal sliding shutter or a sliding door, etc.).

[0036] In Figure 2A, one of the first opening / closing parts 23A blocks one of the first openings 22A, so that the one of the first openings 22A is in a closed state, and in Figure 2B, one of the first opening / closing parts 23A is stored in the storage section 21, so that the one of the first openings 22A is in a closed state.

[0037] The other first opening / closing section 23B operates to open or close the other first opening 22B (in Figures 2A and 2B, the other first opening / closing section 23B is shown to be in the form of a horizontally sliding shutter, but the other first opening / closing section 23B may also be in the form of a horizontally sliding shutter or a sliding door, etc.).

[0038] In Figure 2A, the other first opening / closing part 23B blocks the other first opening 22B, thereby causing the other first opening 22B to be in a closed state, and in Figure 2B, the other first opening 22B is stored in the storage part 21, thereby causing the other first opening 22B to be in a closed state.

[0039] The second opening 24 is formed at a position different from the first opening 22A on one side and the first opening 22B on the other side of the storage section 21. In Figures 2A and 2B, the second opening 24 is shown formed in the ceiling section of the storage section 21. Note that, although the second opening 24 has a concave shape in plan view of the ceiling section in Figures 2A and 2B, it may be a square, a round, or another shape.

[0040] The second opening / closing section 25 has a blind structure that operates to open or close the second opening 24. The blind structure is a structure in which a plurality of slats are provided rotatably, and opening and closing operations are performed by rotating each slat.

[0041] In Figure 2A, the second opening 24 is in a closed state because each slat portion of the second opening / closing section 25 is lying down, and in Figure 2B, the second opening 24 is in a closed state because each slat portion of the second opening / closing section 25 is standing up.

[0042] At least a part of the storage section 21, the first opening / closing section 23A on one side, the first opening / closing section 23B on the other side, and the second opening / closing section 25 are each composed of a heat shield. The heat shield is preferably made of a surface-finished SUS material, and among SUS materials, SUS310S (a SUS material that contains a large amount of chromium and nickel among austenitic stainless steels) is particularly preferable.

[0043] Although not shown, the transport device 2 is provided with an entrance / exit mechanism for taking in and out the steel members W between the storage section 21 and each chamber. Taking in and out the steel members W is performed by operating the entrance / exit mechanism while the door of the target chamber and the opening facing the chamber are in an open state.

[0044] <Configuration of control device> FIG. 3 is a block diagram that illustrates an example of a functional configuration of the control device 4 illustrated in FIG. 1 together with the transport device 2 and a temperature measurement unit 41A.

[0045] Although the temperature measurement unit 41A is omitted in Figures 1, 2A, and 2B, it measures the temperature of the steel material W being transported by the transport device 2, and is a thermocouple or the like provided inside the transport device 2 (note that a temperature measurement unit such as a thermocouple is also provided in each chamber, but the description will be omitted in this embodiment).

[0046] As shown in FIG. 3, the control device 4 functionally includes an acquisition unit 41, a control unit 42, and a storage unit 43 as main components.

[0047] The acquisition unit 41 acquires the measurement results of the temperature measurement unit 41A. The storage unit 43 also stores a predetermined temperature range, which will be described later.

[0048] The control unit 42 controls the opening and closing operation of the first opening and closing unit 23A, the other first opening and closing unit 23B, and the second opening and closing unit 25 provided on the conveying device 2 when transporting the steel material W, for each of the first oil tank 8A, the second oil tank 8B, and the third oil tank 8C, depending on the measurement results of the temperature measurement unit 41A.

[0049] Here, the variation in the amount of temperature drop of the steel members W in each oil tank to which the steel members W are transported will be described. 1, as already described, three oil tanks, namely, the first oil tank 8A, the second oil tank 8B, and the third oil tank 8C, are provided. When the steel members W are transported from the temperature-reducing and soaking chamber 7 to each of the oil tanks, the transport distance and transport time differ for each of the destination oil tanks.

[0050] That is, when transporting the steel material W from the temperature-reducing and soaking chamber 7 to the first oil vat 8A (or the third oil vat 8C), the transport device 2 moves along the rail 15 from a position facing the temperature-reducing and soaking chamber 7 to a position facing the first oil vat 8A (or the third oil vat 8C). However, when transporting the steel material W from the temperature-reducing and soaking chamber 7 to the second oil vat 8B, the second oil vat 8B and the temperature-reducing and soaking chamber 7 are in the same position in the extension direction of the rail 15, so there is no need for the transport device 2 to move (although of course, the entrance / exit mechanism (not shown) operates).

[0051] Therefore, the time required for transport to the first oil vat 8A (or the third oil vat 8C) is longer than the time required for transport to the second oil vat 8B. As a result, the temperature of the steel members W decreases more when transported to the first oil vat 8A (or the third oil vat 8C) than when transported to the second oil vat 8B.

[0052] In order to suppress the variation in the amount of temperature drop of the steel material W at each oil tank as described above, the control unit 42 performs feedback control such as PID control during the transportation of the steel material W so that the measurement results of the temperature measurement unit 41A are within a predetermined temperature range stored in advance in the memory unit 43.

[0053] The above-mentioned predetermined temperature range may be a range including the temperature when the steel materials W are transported to the first oil vat 8A (or the third oil vat 8C) with the second opening 24 in a closed state and with the first opening 22A and the other first opening 22B in a closed state except for loading and unloading the steel materials W. This is because the transport distance and transport time are longest when the steel materials W are transported from the temperature-reducing and soaking chamber 7 to the first oil vat 8A (or the third oil vat 8C), i.e., the amount of temperature drop of the steel materials W is greatest.

[0054] The number of oil tanks provided in the heat treatment device 10 may be any number as long as it is more than one. Therefore, when transporting the steel members W to each oil tank, not only may the transport device 2 move or not, but even if it does move, the transport distance may differ.

[0055] Alternatively, the memory unit 43 stores information (table) linking identification information (such as a management number) for each oil tank or physical elements (transport distance or transport time) for each oil tank with the timing of operational control of the first opening / closing unit 23A on one side, the first opening / closing unit 23B on the other side, and the second opening / closing unit 25. Based on the information, the control unit 42 may perform the operational control at a timing determined for each destination oil tank. In this case, the timing is determined in advance based on actual measurement data of the temperature drop amount for each destination oil tank.

[0056] <Motion Control> FIG. 4 is a flow chart showing an example of the operation of the transport system 1 shown in FIG. 1 from after the carburizing treatment of the steel member W to the quenching treatment.

[0057] (Step SP1) The control unit 42 controls the operation of one of the first opening / closing units 23A, the other of the first opening / closing unit 23B, and the second opening / closing unit 25 of the conveying device 2 located in front of the first carburizing chamber 6A (or the second carburizing chamber 6B), so as to open the other of the first opening units 22B and close the one of the first opening units 22A and the second opening unit 24. Then, an input / output mechanism (not shown) of the conveying device 2 removes (discharges) the carburized steel member W from the first carburizing chamber 6A (or the second carburizing chamber 6B) and stores it inside the storage section 21 through the other first opening 22B, which is in the open state. After that, the process proceeds to step SP2.

[0058] (Step SP2) The control unit 42 controls the operation of the other first opening / closing unit 23B to close the other first opening 22B (the one first opening 22A and the second opening 24 remain in the closed state). Then, the conveying device 2 moves along the rails 15 to the front of the temperature-reducing and soaking chamber 7. After that, the process proceeds to step SP3.

[0059] (Step SP3) The control unit 42 controls the operation of the other first opening / closing unit 23B to open the other first opening 22B (the first opening 22A and the second opening 24 remain in the closed state). Then, an entrance / exit mechanism (not shown) of the transfer device 2 takes out the steel member W inside the storage section 21 from the other first opening 22B, which is in the open state, and loads it into the temperature-reducing / soaking chamber 7. The steel members W charged in the temperature-reducing and soaking chamber 7 are subjected to temperature-reducing and soaking treatment. After that, the process proceeds to step SP4.

[0060] (Step SP4) After the temperature-reducing and soaking treatment, the inlet / outlet mechanism (not shown) of the transport device 2 takes out (discharges) the steel member W from the temperature-reducing and soaking chamber 7 and stores it inside the storage section 21 through the other first opening 22B, which is in the open state. After that, the process proceeds to step SP5.

[0061] (Step SP5) The next step branches depending on whether the next destination of the temperature-reducing and soaking-treated steel material W is the first oil vat 8A (or the third oil vat 8C; that is, the oil vat that takes the longest time to transport from the temperature-reducing and soaking chamber 7) or not. If it is the first oil tank 8A (or the third oil tank 8C), proceed to step SP6; if not (i.e., if it is the second oil tank 8B), proceed to step SP8.

[0062] (Step SP6) The control unit 42 controls the operation of the other first opening / closing unit 23B to close the other first opening 22B (the one first opening 22A and the second opening 24 remain in the closed state). Then, the transfer device 2 moves along the rails 15 to the front of the first oil vat 8A (or the third oil vat 8C). After that, the process proceeds to step SP7.

[0063] (Step SP7) The control unit 42 controls the operation of one of the first opening / closing units 23A to open one of the first opening units 22A. Then, an input / output mechanism (not shown) of the transfer device 2 extracts the steel member W from inside the storage section 21 through one of the first openings 22A in the open state, and loads it into the first oil vat 8A (or the third oil vat 8C). The steel members W placed in the first oil vat 8A (or the third oil vat 8C) are subjected to a quenching treatment. After that, the process (up to the hardening process) is completed.

[0064] (Step SP8) The control unit 42 controls the operation of one of the first opening / closing units 23A to open one of the first opening units 22A. Then, an input / output mechanism (not shown) of the transfer device 2 extracts the steel member W from inside the storage section 21 through one of the first openings 22A in the open state, and loads it into the second oil tank 8B. In parallel with this extraction and loading (transportation), the control unit 42 controls the operation of the other first opening / closing unit 23B and the second opening / closing unit 25, and opens and closes the other first opening 22B and the second opening 24, so that the measurement result of the temperature measurement unit 41A falls within a predetermined temperature range. The steel members W charged in the second oil tank 8B are subjected to a quenching treatment. After that, the process (up to the hardening process) is completed.

[0065] <Action and effect> In this embodiment, when the steel materials W are transported from the temperature-reducing and soaking chamber 7 to the first oil vat 8A, the second oil vat 8B, or the third oil vat 8C, the steel materials W are stored in the storage section 21 and transported. This makes it possible to keep the steel materials W warm. Moreover, the first opening 22A on one side, the first opening 22B on the other side, and the second opening 24 formed in the storage section 21 are opened and closed by the operation of the first opening / closing section 23A on one side, the first opening / closing section 23B on the other side, and the second opening / closing section 25, respectively. This makes it possible to adjust the temperature of the steel materials W during transportation, and to take the steel materials W in and out of each chamber. Therefore, the reliability of the properties of the steel member after the heat treatment can be ensured.

[0066] In this embodiment, the second opening 24 is provided in the ceiling of the storage section 21, and is opened and closed by the operation of the second opening / closing section 25, regardless of whether the steel members W are taken in or out. This makes it easy to adjust the temperature of the steel members W during transportation.

[0067] In this embodiment, a second opening 24 is formed in the ceiling of the storage section 21 . This allows efficient heat dissipation when the second opening 24 is in the open state.

[0068] In this embodiment, a part or the whole of the storage section 21, the first opening / closing section 23A on one side, the first opening / closing section 23B on the other side, and the second opening / closing section 25 are each formed of a heat insulating plate. This can further prevent the temperature of the steel members W from decreasing during transportation.

[0069] In addition, in this embodiment, when the transport distances and transport times from the temperature-reducing and soaking chamber 7 to each oil tank 8A, 8B, 8C are different, the control device 4 controls the opening and closing operations of one first opening and closing unit 23A, the other first opening and closing unit 23B, and the second opening and closing unit 25 for each oil tank when transporting the steel material W. This makes it possible to prevent variation in the temperature drop of the steel members W during transportation, and ensures the reliability of the properties of the steel members W after the heat treatment.

[0070] Furthermore, in this embodiment, the control device 4 controls the operation of one first opening / closing unit 23A, the other first opening / closing unit 23B, and the second opening / closing unit 25 when transporting the steel material W in accordance with the measurement results of the temperature measurement unit 41A. This makes it possible to ensure the reliability of the properties of the steel member W after the heat treatment.

[0071] === Variations === The present invention is not limited to the above-described embodiment. In other words, the above-described specific example may be modified by a person skilled in the art as appropriate, and the modifications may be included in the scope of the present invention as long as they include the features of the present invention. In addition, the elements of the above-described embodiment and the following modifications may be combined to the extent technically possible, and the combinations of these may be included in the scope of the present invention as long as they include the features of the present invention.

[0072] For example, although the above embodiment describes the case where there are multiple oil tanks, the number of oil tanks may be any number as long as it is one or more.

[0073] In the above embodiment, the steel material W that has been subjected to the temperature-reducing and soaking treatment is transported from the temperature-reducing and soaking chamber 7 to the first oil vat 8A, the second oil vat 8B, or the third oil vat 8C. However, instead of this, the carburized steel material W may be transported directly from the first carburizing chamber 6A or the second carburizing chamber 6B to the first oil vat 8A, the second oil vat 8B, or the third oil vat 8C. In other words, the steel material W is transported from the chamber (the first carburizing chamber 6A, the second carburizing chamber 6B, or the temperature-reducing and soaking chamber 7) where the heat treatment (carburizing treatment or temperature-reducing and soaking treatment) is performed to the first oil vat 8A, the second oil vat 8B, or the third oil vat 8C.

[0074] Furthermore, in the above embodiment, the carburizing chambers 6A, 6B and the temperature-reducing and soaking chamber 7 and the oil tanks 8A, 8B, 8C are arranged so as to be separated by the transfer chamber 3, and therefore there are two first openings formed in the storage section 21, the first opening 22A on one side and the first opening 22B on the other side. However, these chambers may be arranged on the same side as viewed from the transfer chamber 3, and there may be only one first opening. Further, the number of second openings 24 may be one or more, and may be provided in a portion other than the ceiling portion of the storage section 21. [Explanation of symbols]

[0075] 1: conveying system, 2: conveying device, 3: conveying chamber, 4: control device, 6A: first carburizing chamber (first chamber), 6B: second carburizing chamber (first chamber), 7: temperature-reducing and soaking chamber (first chamber), 8A: first oil tank (second chamber), 8B: second oil tank (second chamber), 8C: third oil tank (second chamber), 21: storage section, 22A: first opening on one side, 22B: first opening on the other side, 23A: first opening / closing section on one side, 23B: first opening / closing section on the other side, 24: second opening, 25: second opening / closing section, 41A: temperature measuring section

Claims

1. a transfer chamber provided between a first chamber in which at least a heat treatment is performed on the steel member and a second chamber in which a quenching treatment is performed on the steel member; a conveying device that conveys the steel member from the first chamber to the second chamber in the conveying chamber; Equipped with The conveying device is a storage section that is a box-shaped member having a space therein for storing the steel member; a first opening through which the steel member is inserted and removed between the first chamber or the second chamber and the storage section; A first opening / closing unit that operates to open or close the first opening; A transport system comprising:

2. The conveying device is A second opening is formed in the storage portion at a position different from the first opening; and A second opening / closing unit that operates to open or close the second opening; The transport system according to claim 1 , further comprising:

3. The transport system according to claim 2 , wherein the second opening is formed in a ceiling of the storage section.

4. 4. The transport system according to claim 1, wherein at least a portion of the storage section, the first opening / closing section, and the second opening / closing section are formed of a heat insulating plate.

5. The second chamber is a plurality of chambers, The transport system according to claim 4, further comprising a control device that controls the operation of the first opening / closing unit and the second opening / closing unit for each of the second chambers when transporting the steel member.

6. a temperature measuring unit for measuring the temperature of the steel member during transportation; a control device that controls the operation of the first opening / closing unit and the second opening / closing unit when transporting the steel member in accordance with a measurement result of the temperature measuring unit; The transport system according to claim 4, further comprising:

Images