A carburizing and quenching heat treatment apparatus for gears

Abstract

This invention relates to the field of gear heat treatment technology, specifically disclosing a carburizing and quenching heat treatment apparatus for gears. The apparatus includes a carburizing furnace, a placement mechanism, and gears to be processed. The carburizing furnace includes a furnace body and a furnace cover. The furnace body includes a heat-resistant shell, and a support frame is fixedly installed on the bottom inner wall of the heat-resistant shell. An internal gear is rotatably installed on the bottom inner side of the heat-resistant shell. This invention uses a gas guiding component to place the aeration pipe inside the gears to be processed. The airflow generated by the fan blades directly delivers carbon-containing gas to the inner side of each gear, thus ensuring the processing quality of the inner side of the gears. The internal gear drives the external gear to rotate, which in turn drives the aeration placement plate to rotate. This ensures that all gears to be processed continuously rotate within the furnace, so that the outer side of the gears to be processed also continuously comes into contact with carbon-containing gas of the required concentration, thereby ensuring the overall processing quality of the gears.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gear heat treatment processing, more particularly, it relates to a carburizing quenching heat treatment device for gears. BACKGROUND

[0002] A gear is a rotating mechanical element with a toothed profile, used to transmit rotational motion from one shaft to another. Gears are usually used in pairs to transmit torque and change the speed. In the production process of gears, the heat treatment of gears is crucial to improve their performance. Among them, the commonly used heat treatment method for gears is carburizing quenching process, mainly including carburizing, quenching, low temperature tempering and quality inspection steps. Carburizing quenching heat treatment can significantly improve the service life and carrying capacity of gears, and is particularly suitable for application scenarios that bear high load and friction.

[0003] In the carburizing quenching process, the carburizing step is the most important. By placing the gear into a furnace containing active carbon source (such as methane, acetylene, etc.), it is kept at a certain temperature (generally between 900℃ and 950℃) for a period of time. In this process, carbon atoms will diffuse to the surface of the gear, forming a high-carbon surface layer, which will then form hardened martensite structure during the subsequent quenching process. In order to ensure the carburizing effect, it is important to ensure that the gear surface is evenly contacted with the carbon-containing gas.

[0004] After searching, a carburizing quenching heat treatment device for gears is disclosed in Chinese patent No. CN116623121B, which includes a carburizing quenching furnace, a composite rotating support, a heating mechanism first nozzle and a second nozzle. In this invention, the composite rotating support is used to make the outer sides of multiple cylindrical gear blanks rotate synchronously, solving the problem of uneven concentration of the outer sides of multiple cylindrical gear blanks caused by the distribution of the first nozzle. The second nozzle is used to solve the problem of low carburizing gas concentration on the inner circumferential surface of the cylindrical gear blank.

[0005] However, the above design still has some shortcomings. In actual production, in order to improve the processing efficiency, in the carburizing step, a stacked suspension tool is usually set to put as many gears as possible into the carburizing furnace for processing. Therefore, the gears and tool structures located in the upper layer will block the gears located in the lower layer, causing the carburizing gas directly sprayed from top to bottom to have a higher concentration in the upper layer than in the lower layer, resulting in different carburizing degrees of the products and difficulty in ensuring the standard processing quality. SUMMARY

[0006] The present application provides a carburizing quenching heat treatment device for gears, which solves the technical problem of inconsistent concentration of carbon-containing gas between the upper and lower layers of the stacked multiple gears in related technology, thereby affecting the processing quality of the gears.

[0007] According to one aspect of the present application, there is provided a carburizing and quenching heat treatment device for gears, comprising:

[0008] The carburizing furnace, the placing mechanism and the gear to be processed, the carburizing furnace comprises a furnace body and a furnace cover, the furnace body comprises a heat-resistant shell, a supporting bracket is fixedly arranged on the inner wall of the bottom of the heat-resistant shell, an internal gear is rotatably arranged on the inner side of the bottom of the heat-resistant shell, the furnace cover comprises a heat-resistant cover plate, a short drip injector and a long drip injector are arranged on the heat-resistant cover plate for dripping carburizing liquid into the furnace body, a fan blade is rotatably arranged below the heat-resistant cover plate;

[0009] The placing mechanism comprises a positioning assembly and an air guide assembly, the positioning assembly comprises a first perforated plate, a second perforated plate, a connecting rod, a breathable placing disc and an external gear, the connecting rod connects and fixes the first perforated plate and the second perforated plate through a connecting block, a plurality of through holes are formed in the first perforated plate and the second perforated plate, a circular ring table is formed in the inner wall of the through hole, the breathable placing disc is rotatably arranged on the circular ring table and used for placing the gear to be processed, the external gear is matched with the internal gear, the air guide assembly comprises an air guide hopper, a main pipe, a branch pipe and an aeration pipe, the main pipe and the air guide hopper are communicated through a connecting pipe, the branch pipe is inserted into the connecting pipe, a sleeve is connected to one end of the branch pipe, the aeration pipe located at the upper end is rotatably connected to the sleeve, the aeration pipe is fixedly connected to the breathable placing disc, and the lower end of the short drip injector is located in the opening range of the air guide hopper.

[0010] Further, a first motor is hung on the bottom of the heat-resistant shell, a support is fixedly arranged on the output shaft of the first motor, the support is fixedly connected with the internal gear, the internal gear is located on the inner side of the supporting bracket, and the first perforated plate is placed on the supporting bracket.

[0011] Further, a second motor is fixedly arranged on the heat-resistant cover plate, the output shaft of the second motor is fixedly connected with the fan blade, the long drip injector is located on the outer side of the second perforated plate, and a first lifting ring is fixedly arranged on the heat-resistant cover plate.

[0012] Further, a threaded hole is formed in the connecting rod, the threaded hole is matched with the connecting block, the second perforated plate is clamped in the connecting block, the bottom end of the connecting rod is fixedly connected with the first perforated plate, and a second lifting ring is bolted to the top end of the connecting rod.

[0013] Further, a rectangular hole is formed in the second perforated plate, and the rectangular hole is matched with the second lifting ring.

[0014] Further, a sealing cover is fixedly clamped on the bottom end of the aeration pipe located at the lowermost position, and the breathable placing disc located at the lowermost position is fixedly connected with the external gear.

[0015] Further, the main pipe is located in the middle of the first and second porous plates, and the gears to be machined are all sleeved outside the aeration pipe.

[0016] The present application has the following advantages:

[0017] By setting the air guide assembly, the aeration pipe is arranged inside the gear to be machined, and the air flow generated by the fan can directly deliver the carbon-containing gas to the inside of each gear to be machined, thereby ensuring the processing quality of the inside of the gear to be machined.

[0018] The inner gear drives the outer gear to rotate, thereby driving the air-permeable placing disc to rotate, so that all the gears to be machined continuously rotate in the furnace body, so that the outside of the gears to be machined also continuously contacts the carbon-containing gas with a concentration meeting the standard, thereby ensuring the overall processing quality of the gears to be machined. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a perspective structural schematic diagram of the present application;

[0020] Figure 2 is a front view structural schematic diagram of the present application;

[0021] Figure 3 is a structural schematic diagram of the furnace cover part of the present application;

[0022] Figure 4 is a sectional view structural schematic diagram of the furnace body part of the present application;

[0023] Figure 5 is a structural schematic diagram of the inner gear part of the present application;

[0024] Figure 6 is a structural schematic diagram of the placing mechanism part of the present application;

[0025] Figure 7 is a structural schematic diagram of the placing mechanism part of the present application;

[0026] Figure 8 is a structural schematic diagram of the placing mechanism part of the present application;

[0027] Figure 9 is a structural schematic diagram of the second porous plate part of the present application;

[0028] Figure 10 is a structural schematic diagram of the connecting rod part of the present application;

[0029] Figure 11 is a structural schematic diagram of the air guide hopper part of the present application;

[0030] Figure 12is a structural schematic view of a guide air assembly part of the present application;

[0031] Figure 13 is a structural schematic view of an aeration pipe part of the present application;

[0032] Figure 14 is a structural schematic view of an external gear part of the present application.

[0033] In the figure: 1, carburizing furnace; 2, placing mechanism; 3, gear to be processed; 101, furnace body; 102, furnace cover; 201, positioning assembly; 202, guide air assembly; 1011, heat-resistant shell; 1012, first motor; 1013, support; 1014, internal gear; 1015, support bracket; 1021, heat-resistant cover plate; 1022, second motor; 1023, fan blade; 1024, short drip injector; 1025, long drip injector; 1026, first lifting ring; 2011, first porous plate; 2012, second porous plate; 2013, connecting rod; 2014, air-permeable placing disc; 2015, external gear; 2016, through hole; 2017, circular ring table; 2018, rectangular hole; 2019, threaded hole; 20110, connecting block; 20111, second lifting ring; 2021, guide air hopper; 2022, connecting pipe; 2023, main pipe; 2024, branch pipe; 2025, sleeve; 2026, aeration pipe; 2027, sealing cover. DETAILED DESCRIPTION

[0034] The subject matter described herein will now be discussed with reference to example implementations. It should be understood that these implementations are discussed in order to provide a better understanding of the subject matter described herein. Changes to the function and arrangement of elements discussed can be made without departing from the scope of the subject matter content of this specification. Various examples can omit, substitute, or add various procedures or components as appropriate. Also, features described with respect to some examples can be combined in other examples.

[0035] Reference is made to Figures 1-14 As shown, in the present embodiment, a carburizing and quenching heat treatment device for gears is provided, which comprises:

[0036] The carburizing furnace 1, the placing mechanism 2 and the gear to be processed 3, the carburizing furnace 1 comprises a furnace body 101 and a furnace cover 102, the furnace body 101 comprises a heat-resistant shell 1011, a support bracket 1015 is fixedly arranged on the inner wall of the bottom of the heat-resistant shell 1011, an internal gear 1014 is rotatably arranged on the inner side of the bottom of the heat-resistant shell 1011, the furnace cover 102 comprises a heat-resistant cover plate 1021, a short drip injector 1024 and a long drip injector 1025 are arranged on the heat-resistant cover plate 1021, which are used to drip carburizing liquid into the furnace body 101, a fan blade 1023 is rotatably arranged below the heat-resistant cover plate 1021;

[0037] The placing mechanism 2 comprises a positioning assembly 201 and a gas guiding assembly 202, the positioning assembly 201 comprises a first porous plate 2011, a second porous plate 2012, a connecting rod 2013, a gas-permeable placing disc 2014 and an external gear 2015, the connecting rod 2013 connects and fixes the first porous plate 2011 and the second porous plate 2012 through a connecting block 20110, a plurality of through holes 2016 are formed on the first porous plate 2011 and the second porous plate 2012, a circular ring table 2017 is formed on the inner wall of the through hole 2016, the gas-permeable placing disc 2014 is rotationally arranged on the circular ring table 2017 and is used for placing a gear to be processed 3, the external gear 2015 is matched with the internal gear 1014, the gas guiding assembly 202 comprises a gas guiding hopper 2021, a main pipe 2023, a branch pipe 2024 and an aeration pipe 2026, the main pipe 2023 and the gas guiding hopper 2021 are communicated through a connecting pipe 2022, the branch pipe 2024 is inserted on the connecting pipe 2022, a sleeve 2025 is connected to one end of the branch pipe 2024, the aeration pipe 2026 located at the upper end is rotationally connected to the sleeve 2025, the aeration pipe 2026 is fixedly connected to the gas-permeable placing disc 2014, and the lower end of the short drip injector 1024 is located in the opening range of the gas guiding hopper 2021.

[0038] Referring to Figures 2-4 In the embodiment, the bottom of the heat-resistant shell 1011 is hung with a first motor 1012, a support 1013 is fixedly arranged on the output shaft of the first motor 1012, the support 1013 is fixedly connected with the internal gear 1014, the internal gear 1014 is located on the inner side of the supporting frame 1015, and the first porous plate 2011 is placed on the supporting frame 1015.

[0039] It should be noted that the first porous plate 2011 is matched with the supporting frame 1015, and the internal gear 1014 does not contact the supporting frame 1015.

[0040] Referring to Figures 1-3 In the embodiment, a second motor 1022 is fixedly arranged on the heat-resistant cover plate 1021, the output shaft of the second motor 1022 is fixedly connected with the fan blade 1023, the long drip injector 1025 is located on the outer side of the second porous plate 2012, and a first lifting ring 1026 is fixedly arranged on the heat-resistant cover plate 1021.

[0041] It should be noted that the drip speed of the short drip injector 1024 and the long drip injector 1025 is controlled by an external related device, and the airflow generated by the fan blade 1023 is directly blown into the gas guiding hopper 2021.

[0042] Referring to Figures 8-10As shown, in the embodiment, a threaded hole 2019 is formed in the connecting rod 2013, the threaded hole 2019 is matched with the connecting block 20110, the second porous plate 2012 is clamped in the connecting block 20110, the bottom end of the connecting rod 2013 is fixedly connected with the first porous plate 2011, and the top end of the connecting rod 2013 is bolted with a second lifting ring 20111.

[0043] It should be noted that the second porous plate 2012 can be increased or reduced according to the actual number of gears 3 to be machined and the actual specifications of the carburizing furnace 1.

[0044] Referring to Figures 9-10 As shown, in the embodiment, a rectangular hole 2018 is formed in the second porous plate 2012, and the rectangular hole 2018 is matched with the second lifting ring 20111.

[0045] It should be noted that the second porous plate 2012 can be conveniently spliced.

[0046] Referring to Figures 13-14 As shown, in the embodiment, a sealing cover 2027 is fixedly clamped on the bottom end of the aeration pipe 2026 located at the lowermost position, and the gas-permeable placement disc 2014 located at the lowermost position is fixedly connected with the external gear 2015.

[0047] It should be noted that the gas-permeable placement disc 2014 can be conveniently driven to rotate.

[0048] Referring to Figures 6-7 As shown, in the embodiment, the main pipe 2023 is located at the intermediate position of the first porous plate 2011 and the second porous plate 2012, and the gears 3 to be machined are all sleeved outside the aeration pipe 2026.

[0049] It should be noted that the gas concentration inside the gears 3 to be machined can be conveniently adjusted.

[0050] The operating principle of the present application will be described as follows:

[0051] First, the to-be-processed gear 3 is placed in the middle position of the air-permeable placing disc 2014 in sequence, and the aeration pipe 2026 is arranged at the inner side of the to-be-processed gear 3, then the assembly of the placing mechanism 2 is completed in sequence, when the to-be-processed gears 3 are all placed, the placing mechanism 2 is hoisted into the preheated furnace body 101 by the crane, when the first perforated plate 2011 is attached to the support frame 1015, and all the outer gears 2015 are engaged with the inner gear 1014, the crane is removed, and the furnace cover 102 is hoisted onto the furnace body 101 for sealing, then the to-be-processed gears 3 are kept in the furnace body 101 for a long enough time, at the same time, the carburizing liquid is added into the furnace body 101 through the short drip injector 1024 and the long drip injector 1025, and the first motor 1012 and the second motor 1022 are turned on at the same time, at this time, the carburizing liquid injected by the long drip injector 1025 is evaporated into carbon-containing gas around the outer side of the second perforated plate 2012, and the carbon-containing gas evaporated from the lower end of the short drip injector 1024 is blown into the main pipe 2023 by the airflow generated by the fan blade 1023, and is distributed into each branch pipe 2024, and is discharged from the aeration pipe 2026, the discharged carbon-containing gas adjusts the carbon-containing gas concentration at the inner side of the to-be-processed gear 3, so that the carbon concentration of the gas contacted by the to-be-processed gear 3 also meets the standard, at the same time, the outer gear 2015 is driven to rotate by the inner gear 1014, so that the air-permeable placing disc 2014 is driven to rotate, and all the to-be-processed gears 3 in the furnace body 101 are continuously rotated, so that the outer side of the to-be-processed gear 3 also continuously contacts the carbon-containing gas meeting the standard, at this time, the whole to-be-processed gear 3 contacts the carbon-containing gas meeting the standard uniformly, and the processing quality is ensured.

[0052] The above describes the embodiments of the present embodiment in combination with the drawings, but the present embodiment is not limited to the above specific embodiments, the above specific embodiments are only illustrative, but not restrictive, and those skilled in the art can make many forms under the inspiration of the present embodiment without departing from the scope of the present embodiment and the scope protected by the claims, which all belong to the protection of the present embodiment.

Claims

1. A carburizing and quenching heat treatment apparatus for gears, characterized in that, The utility model relates to a carburizing furnace, and particularly relates to a carburizing furnace and a placing mechanism. The utility model discloses a carburizing furnace, and particularly relates to a carburizing furnace and a placing mechanism. The utility model discloses a carburizing furnace, and particularly relates to a carburizing furnace and a placing mechanism.

2. A carburizing and quenching heat treatment apparatus for a gear according to claim 1, characterized by: ​ 3. A carburizing and quenching heat treatment apparatus for a gear according to claim 1, characterized in that: The heat-resistant cover plate (1021) is fixedly provided with a second motor (1022), the output shaft of the second motor (1022) is fixedly connected with the fan blade (1023), the long drip infusion device (1025) is located outside the second multi-hole plate (2012), and the heat-resistant cover plate (1021) is fixedly provided with a first lifting ring (1026).

4. The carburizing and quenching heat treatment apparatus for a gear according to claim 1, characterized by: A threaded hole (2019) is formed in the connecting rod (2013), the threaded hole (2019) is matched with the connecting block (20110), the second multi-hole plate (2012) is clamped in the connecting block (20110), the bottom end of the connecting rod (2013) is fixedly connected with the first multi-hole plate (2011), and the top end of the connecting rod (2013) is bolted with a second lifting ring (20111).

5. A carburizing and quenching heat treatment apparatus for a gear according to claim 4, characterized in that: A rectangular hole (2018) is formed in the second multi-hole plate (2012), and the rectangular hole (2018) is matched with the second lifting ring (20111).

6. A carburizing and quenching heat treatment apparatus for a gear according to claim 1, wherein: The bottom end of the lowermost aeration pipe (2026) is fixedly clamped with a sealing cover (2027), and the lowermost gas-permeable placement disc (2014) is fixedly connected with the external gear (2015).

7. The carburizing and quenching heat treatment apparatus for a gear according to claim 1, characterized by: The main pipe (2023) is located at the middle position of the first multi-hole plate (2011) and the second multi-hole plate (2012), and the gear (3) to be machined is sleeved outside the aeration pipe (2026).

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