Long-size multi-zone box-type tempering furnace

Abstract

The utility model relates to the technical field of heat treatment equipment, in particular to a long-size multi-zone box-type tempering furnace, at least two sets of heaters are arranged in a hearth, and heating elements of the heaters are hung in the hearth; each set of heater is provided with a circulating fan; an air blowing opening of the circulating fan faces a heating element of the heater, and an air suction opening of the circulating fan faces the direction, where parts are placed, in the hearth; a thermal induction temperature control system is further included, and an infrared thermal inductor is adopted as a sensor of the thermal induction temperature control system. A hollow high-temperature-resistant pipe is further arranged corresponding to the infrared heat sensor, one end of the high-temperature-resistant pipe is arranged outside the hearth, and the other end of the high-temperature-resistant pipe is arranged in the hearth. The infrared heat sensor is arranged in the part, outside the hearth, of the high-temperature-resistant pipe; a light-sensitive surface of the infrared heat sensor faces the other end of the high-temperature-resistant pipe; the high-standard heat treatment requirement of large-size parts is improved, and the infrared heat inductor is prevented from being damaged by high temperature.

Description

Technical Field

[0001] The present application relates to the technical field of heat treatment equipment, in particular to a tempering furnace. Background Art

[0002] A tempering furnace is a device used to heat metal parts, usually used for heat treatment processes such as annealing, tempering, and quenching of metals.

[0003] However, when existing tempering furnaces are used to process some large-sized parts, such as aircraft landing gear supports, the safety requirements of civil aviation are very high, and the heat treatment quality requirements of parts are very strict. The existing tempering furnaces cannot simultaneously meet the large-sized furnace loading space and high-standard heat treatment quality. Utility Model Content

[0004] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the name of the utility model of this application to avoid blurring the purpose of this section, the abstract of the specification and the name of the utility model, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0005] In view of the above problems and / or the problems existing in the prior art, the present utility model is proposed.

[0006] A long multi-zone box-type tempering furnace comprises a furnace shell, a furnace chamber is arranged in the furnace shell, and a heat insulation layer is filled between the furnace shell and the furnace chamber, and is characterized in that:

[0007] At least two sets of heaters are arranged in the furnace along the furnace direction, and the heating elements of the heaters are suspended inside the furnace;

[0008] Each set of heaters is equipped with a circulating fan, and the rotating shaft of the circulating fan passes through the furnace shell and the heat insulation layer and extends into the furnace;

[0009] The blowing port of the circulating fan faces the heating element of the heater, and the suction port of the circulating fan faces the direction in which the parts are placed in the furnace;

[0010] It also includes a thermal induction temperature control system, the sensor of which is an infrared thermal sensor;

[0011] The control signal output end of the thermal induction temperature control system controls and connects at least one of a heater and a circulating fan;

[0012] The coverage area of ​​each set of heaters in the furnace is provided with at least one infrared heat sensor;

[0013] A hollow high-temperature resistant tube is also provided corresponding to the infrared heat sensor, one end of the high-temperature resistant tube is provided outside the furnace, and the other end is provided inside the furnace;

[0014] The infrared heat sensor is arranged in the part of the high temperature resistant tube outside the furnace;

[0015] The photosensitive surface of the infrared heat sensor faces the other end of the high temperature resistant tube;

[0016] Furthermore, at least two infrared heat sensors are respectively directed toward the coverage areas of at least two heaters in the furnace.

[0017] The above design has the physical basis that the furnace of the tempering furnace can adjust the temperature of different heater coverage areas, so as to achieve high-standard heat treatment effects on large-sized parts. First, at least two sets of heaters are arranged in the furnace, and a circulating fan is provided to achieve heating of different areas in the furnace to make up for the inaccurate temperature control after the size is too large. Secondly, the circulating fan is used, and the flowing gas can help transfer heat to the surface of the parts more evenly, so that the heat treatment quality is better. Then, the thermal induction temperature control system is used. According to the infrared thermal sensor sensing different heater coverage areas, the heater or circulating fan is adjusted to make the temperature uniformity in the entire effective area reach within ±3 degrees at the same time, and the temperature control accuracy of the heat treatment is higher and the quality is better. Finally, a high-temperature resistant tube is used to prevent the infrared thermal sensor from directly contacting the high temperature in the furnace and preventing the infrared thermal sensor from being damaged by high temperature.

[0018] Preferably, the high temperature resistant tube extends beyond the furnace shell by a length of 80-120 cm; the high temperature resistant tube extends out from the furnace shell to prevent the temperature from being conducted to the infrared thermal sensor and damaging the device.

[0019] Preferably, a vacuum insulation tube is provided in the high temperature resistant tube, the outer wall of the vacuum insulation tube is tightly fitted with the inner wall of the high temperature resistant tube, and the vacuum insulation tube is arranged at one end close to the infrared sensor; providing the vacuum insulation tube in the high temperature resistant tube can protect the infrared heat sensor from being damaged by the high temperature in the furnace, and can also prevent the heat in the tempering furnace from dissipating.

[0020] Preferably, the tube wall of the vacuum insulated tube is made of ceramic material; both ends of the vacuum insulated tube are sealed with borosilicate glass; ceramic and borosilicate glass are both high temperature resistant materials, and the vacuum insulated tube can maintain insulation and sealing under high temperature and high pressure.

[0021] Preferably, an insulation board is provided between the heaters, and the insulation board is made of aluminum silicate material; the furnace is provided with longitudinal and transverse directions, the arrangement direction of the heaters in the furnace is longitudinal, and the insulation board blocks the longitudinal wind blown out by the circulating fan; by providing the insulation board, the circulating fan is prevented from blowing hot air to the coverage area of ​​the adjacent heater, resulting in uneven heat control.

[0022] Preferably, guide plates are further provided in the furnace, and the guide plates are arranged longitudinally along the furnace; at least two guide plates are provided in each heater area, and a cavity for gas circulation is provided between the guide plates and the inside of the furnace, and the blowing port of the circulating fan is connected with the cavity, and a storage bin is provided between the guide plates arranged transversely in the furnace, and the suction port of the circulating fan is connected with the storage bin, and the cavity is connected with the storage bin; the guide plates are used to realize the circulation of gas between the cavity and the storage bin, and the flowing gas can help transfer heat to the surface of the components more evenly, thereby achieving stable heat distribution in the storage bin and improving the quality of heat treatment of components.

[0023] Preferably, a wind shield is arranged between the guide plates, the wind shield is arranged on a side close to the circulation fan, and a vent is arranged on the wind shield facing the air intake port of the circulation extension; the wind shield is connected to the side of the guide plate, and the wind shield is also connected to the heat insulation plate; the wind shield is arranged to ensure the stability of the path of the circulating airflow, and cooperates with the heat insulation plate to prevent the hot air flows between different heaters from affecting each other, so that the heat treatment effect of components is better.

[0024] Preferably, the guide plate is provided with a support column, and the support column is connected to the inner wall of the furnace; the support column is connected to the opposite side of the guide plate; by arranging the support column, hot air can flow from the cavity into the accommodating cavity, thereby ensuring the stable operation of the circulating airflow.

[0025] Preferably, a support frame for placing parts is also provided in the furnace, and the height of the support frame is greater than the height of the support column; by providing a support frame higher than the support column, the parts can be completely placed in the hot circulating air, thereby improving the quality of heat treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0027] Figure 1 A schematic diagram of a longitudinal cross-sectional structure of a long-size multi-zone box-type tempering furnace according to an embodiment of the utility model;

[0028] Figure 2 A schematic diagram of a transverse cross-sectional structure of a long multi-zone box-type tempering furnace according to an embodiment of the utility model;

[0029] Figure 3A schematic diagram of the internal structure of a furnace in a long-sized multi-zone box-type tempering furnace according to an embodiment of the utility model. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned purposes, features and advantages of the present invention more understandable, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0032] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general proportion, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0033] Secondly, the "one embodiment" or "embodiment" referred to herein refers to a specific feature, structure or characteristic that can be included in at least one implementation of the utility model. The "in one embodiment" that appears in different places in this specification does not refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0034] Example 1

[0035] Reference Figure 1 and Figure 2 This embodiment provides a long-sized multi-zone box-type tempering furnace, including a furnace shell 1, a furnace chamber 2 is arranged in the furnace shell 1, and a heat insulation layer 3 is filled between the furnace shell 1 and the furnace chamber 2.

[0036] At least two sets of heaters 4 are arranged in the furnace 2 along the direction of the furnace 2, and the heating elements of the heaters 4 are suspended inside the furnace 2; each set of heaters 4 is equipped with a circulating fan 5, and the rotating shaft of the circulating fan 5 passes through the furnace shell 1 and the insulation layer 3 and extends into the furnace 2; the blowing port of the circulating fan 5 faces the heating element of the heater 4, and the suction port of the circulating fan 5 faces the direction of the parts placed in the furnace 2; it also includes a thermal induction temperature control system, and the sensor of the thermal induction temperature control system adopts an infrared thermal sensor; the control signal output end of the thermal induction temperature control system controls and connects at least one of the heater 4 and the circulating fan 5; each set of heaters in the furnace 2 At least one infrared thermal sensor is provided in the coverage area of ​​each heater 4; a hollow high-temperature resistant tube 6 is also provided corresponding to the infrared thermal sensor, one end of the high-temperature resistant tube 6 is arranged outside the furnace 2, and the other end is arranged inside the furnace 2; the infrared thermal sensor is arranged in the part of the high-temperature resistant tube 6 outside the furnace 2; the photosensitive surface of the infrared thermal sensor faces the other end of the high-temperature resistant tube 6; furthermore, at least two infrared thermal sensors are respectively facing the coverage areas of at least two heaters 4 in the furnace 2; the model of the thermal induction temperature control system is the AC500 control system, which is a commonly used technical means for furnace temperature control in this field and provides a basis for the implementation of this scheme. The model of the infrared thermal sensor is MLX90614.

[0037] The length of the high temperature resistant tube 6 extending beyond the furnace shell 1 is 80-120 cm.

[0038] A vacuum insulation tube is arranged in the high temperature resistant tube 6 , and the outer wall of the vacuum insulation tube is closely fitted with the inner wall of the high temperature resistant tube 6 . The vacuum insulation tube is arranged at one end close to the infrared sensor.

[0039] The wall of the vacuum insulation tube is made of ceramic material; both ends of the vacuum insulation tube are sealed with borosilicate glass.

[0040] When in use, after the parts are placed in the furnace cavity, the furnace door is closed and all heaters 4 and circulating fans 5 are turned on to heat the parts by circulating hot air. The infrared thermal sensor detects the temperature in the furnace through the high-temperature resistant tube 6. The thermal sensing temperature control system adjusts the operating efficiency of the heater 4 or the circulating fan 5 according to the real-time temperature to ensure that the temperature uniformity in the area covered by the heater 4 is within ±3 degrees. The two heaters 4 work at the same time to make up for the inaccurate temperature control after the size is too large, improve the heat treatment quality of large-sized parts, and meet the high-standard heat treatment requirements of large-sized parts.

[0041] Example 2

[0042] Reference Figure 2 and Figure 3 , which is the second embodiment of the utility model, and this embodiment is based on the previous embodiment.

[0043] An insulation board 7 is arranged between the heaters 4, and the insulation board 7 is made of aluminum silicate material; the furnace 2 is provided with longitudinal and transverse directions, the arrangement direction of the heaters 4 in the furnace 2 is longitudinal, and the insulation board 7 blocks the longitudinal wind blown out by the circulation fan 5.

[0044] The furnace 2 is also provided with guide plates 8, and the guide plates 8 are arranged longitudinally along the furnace 2; at least two guide plates 8 are arranged in each heater 4 area, and a cavity for gas circulation is provided between the guide plates 8 and the inside of the furnace 2, and the blowing port of the circulating fan 5 is connected to the cavity, and a storage bin is provided between the guide plates 8 arranged horizontally in the furnace 2, the suction port of the circulating fan 5 is connected to the storage bin, and the cavity is connected to the storage bin.

[0045] A wind shield 10 is arranged between the guide plates 8, and the wind shield 10 is arranged on a side close to the circulation fan 5. The wind shield 10 is provided with a vent at a position directly opposite to the air intake port of the circulation extension; the wind shield 10 is connected to the side of the guide plate 8, and the wind shield 10 is also connected to the insulation plate 7.

[0046] The guide plate 8 is provided with a support column, and the support column is connected to the inner wall of the furnace 2; the support column is connected to the opposite side of the guide plate 8.

[0047] A support frame 9 for placing parts is also provided in the furnace 2, and the height of the support frame 9 is greater than the height of the support column.

[0048] During use, after the parts are placed on the support frame 9, the furnace door is closed, and the heater 4 and the circulating fan 5 are turned on to perform heat treatment on the parts. Different heaters 4 are isolated by the heat insulation board 7 and the wind shield 10 to prevent the heaters 4 from affecting each other and causing inaccurate temperature control. Then, by setting the guide plate 8, the gas blown out by the circulating fan is heated by the heating element, and then enters the heating element in the accommodating cavity through the air from the cavity. Then, the air is sucked away from the vent of the wind shield 10 by the circulating fan 5, and then the air is heated by the heating element and circulated to the heating element. The circulating flow of gas can help transfer heat to the surface of parts more evenly, and the quality of heat treatment of parts is better.

[0049] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and ratio of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangements, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present utility model. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also an equivalent structure. Without departing from the scope of the present invention, other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the present invention is not limited to a specific embodiment, but extends to various modifications that still fall within the scope of the appended claims.

[0050] Additionally, in order to provide a concise description of example embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0051] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0052] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A long multi-zone box-type tempering furnace, comprising a furnace shell, a furnace chamber is arranged in the furnace shell, and a heat insulation layer is filled between the furnace shell and the furnace chamber, characterized in that: At least two sets of heaters are arranged in the furnace along the furnace direction, and the heating elements of the heaters are suspended inside the furnace; Each set of heaters is equipped with a circulating fan, and the rotating shaft of the circulating fan passes through the furnace shell and the heat insulation layer and extends into the furnace; The blowing port of the circulating fan faces the heating element of the heater, and the suction port of the circulating fan faces the direction in which the parts are placed in the furnace; It also includes a thermal induction temperature control system, the sensor of which is an infrared thermal sensor; The control signal output end of the thermal induction temperature control system controls and connects at least one of a heater and a circulating fan; The coverage area of ​​each set of heaters in the furnace is provided with at least one infrared heat sensor; A hollow high-temperature resistant tube is also provided corresponding to the infrared heat sensor, one end of the high-temperature resistant tube is provided outside the furnace, and the other end is provided inside the furnace; The infrared heat sensor is arranged in the part of the high temperature resistant tube outside the furnace; The photosensitive surface of the infrared heat sensor faces the other end of the high temperature resistant tube; Furthermore, at least two infrared heat sensors are respectively directed toward the coverage areas of at least two heaters in the furnace.

2. The long multi-zone box-type tempering furnace according to claim 1 is characterized in that: The length of the high temperature resistant tube extending beyond the furnace shell is 80-120 cm.

3. The long multi-zone box-type tempering furnace according to claim 2 is characterized in that: A vacuum insulation tube is arranged in the high temperature resistant tube, the outer wall of the vacuum insulation tube is closely fitted with the inner wall of the high temperature resistant tube, and the vacuum insulation tube is arranged at one end close to the infrared sensor.

4. The long multi-zone box-type tempering furnace according to claim 3 is characterized in that: The tube wall of the vacuum insulation tube is made of ceramic material; Both ends of the vacuum insulation tube are sealed with borosilicate glass.

5. The long multi-zone box-type tempering furnace according to claim 4 is characterized in that: A heat insulation board is arranged between the heaters, and the heat insulation board is made of aluminum silicate material; The furnace is provided with longitudinal and transverse directions, the arrangement direction of the heaters in the furnace is longitudinal, and the heat insulation board blocks the longitudinal wind blown out by the circulation fan.

6. The long multi-zone box-type tempering furnace according to claim 5 is characterized in that: The furnace is also provided with guide plates, which are arranged longitudinally along the furnace; At least two guide plates are arranged in each heater area, a cavity for gas circulation is arranged between the guide plates and the inside of the furnace, the air outlet of the circulating fan is connected to the cavity, a storage bin is arranged between the guide plates arranged horizontally in the furnace, the air intake of the circulating fan is connected to the storage bin, and the cavity is connected to the storage bin.

7. The long multi-zone box-type tempering furnace according to claim 6 is characterized in that: A wind shield is arranged between the guide plates, and the wind shield is arranged on a side close to the circulation fan, and a vent is arranged at a position of the wind shield facing the air inlet of the circulation extension; The wind shield is connected to the side of the guide plate, and the wind shield is also connected to the heat insulation plate.

8. The long multi-zone box-type tempering furnace according to claim 7 is characterized in that: The guide plate is provided with a support column, and the support column is connected to the inner wall of the furnace; The support columns are connected to opposite sides of the guide plate.

9. The long multi-zone box-type tempering furnace according to claim 8, characterized in that: A support frame for placing parts is also provided in the furnace, and the height of the support frame is greater than the height of the support column.

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