Upper-inlet and lower-outlet type vertical quenching furnace

Abstract

The vertical quenching furnace comprises a deep well heating furnace, a quenching liquid pool, a feeding port, a discharging port, a heating wire and a communicating structure, the feeding port is formed in the top of the deep well heating furnace, the discharging port is formed in the bottom of the deep well heating furnace, the top of the quenching liquid pool is connected with the discharging port of the deep well heating furnace, and the heating wire is installed on the inner wall of the deep well heating furnace. The furnace pipe is of a detachable structure, the communicating structure is connected with the deep well heating furnace and the quenching liquid pool, the heights and sizes of the quenching liquid pool and the deep well heating furnace are adjusted according to the size of a workpiece, and through the design of vertical hoisting and closed connection, the contact time of the workpiece and air in the process from discharging to quenching is effectively shortened, the oxidation risk is reduced, and the quenching quality is improved; the device has the advantages of reducing temperature difference and hardness difference, improving workpiece quality, being environment-friendly, safe and the like, and is suitable for quenching requirements of different workpieces in different scenes.

Description

Technical Field

[0001] This utility model relates to the field of quenching equipment technology, specifically to a top-in, bottom-out vertical quenching furnace. Background Technology

[0002] See Figure 1 Traditional quenching furnaces cannot provide atmospheric protection during the time between the workpiece leaving the furnace and entering the quenching liquid pool, causing the workpiece to be exposed to air, which easily leads to oxidation and a decrease in hardness. This problem is particularly fatal for products with requirements for hardness, microstructure, and crystal phase.

[0003] The utility model with authorization announcement number CN201809401U discloses a "horizontal long-shaft horizontal quenching furnace unit", including a front material platform, a quenching furnace body, a rear tilting material platform, and a quenching device. The front material platform, the quenching furnace body, the rear tilting material platform, and the quenching device are arranged adjacent to each other in sequence. The quenching furnace unit of this utility model adopts a horizontal quenching method, which reduces the requirements for the height of the factory or workshop or the depth of the pit, and also greatly reduces the requirements for hoisting equipment, making it easier for workpieces to enter and exit the furnace. Horizontal quenching solves the problem of uneven hardness caused by large temperature difference between the upper and lower parts of the workpiece during quenching. However, after the workpiece is taken out of the furnace, it needs to be moved horizontally to the quenching liquid pool, resulting in a long exposure time of the workpiece in the air, which cannot effectively prevent oxidation.

[0004] The invention disclosed in application publication number CN114231708A discloses a novel quenching furnace for metal heat treatment, including a heating box, a quenching furnace shell, a fixing plate, a waste heat recovery and reprocessing component, and a control box. The heating box contains a heating component, a gas storage box, and a heat recovery component, and the heating component is connected to the gas storage box. This novel quenching furnace for metal heat treatment has the advantages of circulating the hot air in the heating box, cleaning and drying the quenched metal, automatically filtering and cleaning impurities in wastewater, and recovering and reusing the residual heat in the wastewater. However, its structural design does not consider a sealed connection, and it cannot completely prevent the workpiece from contacting the air after exiting the furnace.

[0005] In summary, existing quenching equipment typically has the following drawbacks:

[0006] 1) Poor quenching quality: Traditional horizontal heating method, where the workpiece is placed flat for heating, is prone to deformation, resulting in poor vertical accuracy and complicated subsequent straightening process;

[0007] 2) The workpiece is prone to oxidation: The time difference between the workpiece leaving the furnace and entering the quenching liquid pool causes the workpiece to be exposed to air after leaving the furnace but before entering the quenching liquid pool, which makes it prone to oxidation and affects hardness and microstructure.

[0008] 3) Low quenching efficiency: Traditional quenching furnaces require a long time to lift the workpiece out of the furnace and put it back into the quenching liquid, resulting in temperature and hardness differences between the upper and lower parts of the workpiece. Summary of the Invention

[0009] The purpose of this invention is to solve the problems in the prior art by proposing a top-in, bottom-out vertical quenching furnace, which can solve the problems of poor quenching quality, easy oxidation of workpieces, and low quenching efficiency.

[0010] To achieve the above objectives, this utility model proposes a top-in, bottom-out vertical quenching furnace, comprising a deep well heating furnace, a quenching liquid pool, a feed inlet, a discharge outlet, heating wires, and a connecting structure. The deep well heating furnace has a feed inlet at the top and a discharge outlet at the bottom. The top of the quenching liquid pool is connected to the discharge outlet of the deep well heating furnace. The heating wires are installed on the inner wall of the deep well heating furnace. The connecting structure connects the deep well heating furnace and the quenching liquid pool.

[0011] Preferably, the deep well heating furnace has a quenching chamber with a square or round opening inside, and the quenching chamber is equipped with a furnace liner, which is a detachable structure.

[0012] Preferably, the quenching liquid pool is a rectangular pool, and the top of the quenching liquid pool and the bottom of the deep well heating furnace are connected in a sealed manner through a connecting structure.

[0013] Preferably, both the feed inlet and the discharge outlet are equipped with openable furnace doors.

[0014] Preferably, the connecting structure is an open or closed structure.

[0015] Preferably, the workpiece enters the quenching chamber inside the deep well heating furnace through the feed inlet, and the quenching liquid pool is equipped with a receiving device to receive the workpiece falling from the deep well heating furnace.

[0016] Preferably, the liquid level in the quenching liquid pool is lower than the bottom surface of the discharge port, and the height and size of the quenching liquid pool and the deep well heating furnace are adjusted according to the workpiece size.

[0017] The beneficial effects of this utility model are:

[0018] 1) Reduce temperature and hardness differences: Vertical hoisting heating avoids prolonged exposure of workpieces after they come out of the furnace, reducing temperature and hardness differences between the top and bottom;

[0019] 2) Improve workpiece quality: Heating and quenching under a protective gas environment improves the internal structure and mechanical properties of the workpiece, while also enhancing its appearance accuracy and aesthetics;

[0020] 3) Environmental protection, safety and convenient operation: The workpiece can be heated and quenched under gas protection, avoiding the toxic gas and environmental pollution caused by traditional high temperature salt bath quenching. At the same time, vertical hoisting heating is not as easy to deform as horizontal heating, has good vertical accuracy, and the post-straightening process is simple. It is suitable for mass production and high-precision workpiece quenching.

[0021] The features and advantages of this utility model will be described in detail through embodiments and accompanying drawings. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a quenching furnace in the prior art;

[0023] Figure 2 This is a schematic diagram of the structure of a vertical quenching furnace with top inlet and bottom outlet according to this utility model.

[0024] Numbers in the diagram: 1-Deep well heating furnace; 2-Quenching liquid pool; 3-Feed inlet; 4-Discharge outlet; 5-Heating wire; 6-Connecting structure; 7-Furnace chamber; 8-Workpiece. Detailed Implementation

[0025] Example 1:

[0026] See Figure 2 This utility model discloses a top-inlet, bottom-outlet vertical quenching furnace, comprising a deep well heating furnace 1, a quenching liquid pool 2, a feed inlet 3, a discharge outlet 4, a heating wire 5, and a connecting structure 6. The deep well heating furnace 1 has a feed inlet 3 at the top and a discharge outlet 4 at the bottom. The top of the quenching liquid pool 2 is connected to the discharge outlet 4 of the deep well heating furnace 1. The heating wire 5 is installed on the inner wall of the deep well heating furnace 1. The connecting structure 6 connects the deep well heating furnace 1 and the quenching liquid pool 2.

[0027] In this embodiment, the deep well heating furnace 1 is square, without an internal furnace chamber 7, with a feed inlet 3 at the top and a discharge outlet 4 at the bottom. The quenching liquid pool is an open design, and the quenching liquid pool 2 is connected to the deep well heating furnace 1 through an open connecting structure 6. The workpiece 8 is vertically hoisted into the deep well heating furnace 1 by a crane, and after heating, it is directly lowered into the quenching liquid pool 2. The square design of the deep well heating furnace 1 facilitates manufacturing and maintenance, reducing equipment costs. The open quenching liquid pool 2 facilitates the entry and exit of the workpiece 8 and the quenching operation. This embodiment has a simple structure, is easy to operate, and is suitable for the mass production of ordinary workpieces.

[0028] Example 2:

[0029] This embodiment is basically the same as embodiment 1, except that: the deep well heating furnace 1 is circular, with a furnace liner 7 inside and a protective gas is introduced, the heating wire 5 is wrapped around the inner wall of the deep well heating furnace 1, and furnace doors are provided at the top and bottom of the deep well heating furnace 1. The furnace doors adopt a closed design, and the quenching liquid pool 2 is connected to the deep well heating furnace 1 through an open communication structure 6.

[0030] In this embodiment, the circular deep-well heating furnace 1 and the furnace chamber 7 can provide a more uniform heating effect. The furnace chamber 7 protects the heating wire and extends the service life of the equipment. The sealing design of the furnace door ensures temperature stability during the heating process and improves the quenching quality. The uniform heating and sealing design are suitable for quenching high-precision long workpieces.

[0031] Example 3:

[0032] This embodiment is basically the same as embodiment 2, except that: based on embodiment 2, the connecting structure 6 is a closed type, a transparent observation window is added to the outer wall of the quenching liquid pool 2 to facilitate real-time monitoring of the quenching process, and a robotic arm is provided inside the quenching liquid pool 2 to receive the workpiece 8 falling from the deep well heating furnace 1 and to assist in the removal operation after quenching.

[0033] In this embodiment, the sealed interconnection structure 6 isolates the air, effectively preventing the oxidation of the workpiece 8 from the furnace to the quenching stage, improving the uniformity of the hardness of the workpiece 8. The transparent observation window allows operators to monitor the quenching process in real time, ensuring quenching quality. The robotic arm or lifting device improves the automation of the quenching operation, reduces manual intervention, and enhances safety. It is suitable for quenching high-risk workpieces, facilitates real-time monitoring of the quenching status, ensures quenching quality, and is suitable for complex workpieces.

[0034] Working principle:

[0035] First, workpiece 8 enters the deep well heating furnace 1 through the top feed inlet 3 via a crane for heating. The feed inlet 3 is equipped with a furnace door. Inside the deep well heating furnace 1, workpiece 8 is heated by heating wire 6, which is wrapped around the inner wall of the furnace. After heating, workpiece 8 is released from the deep well heating furnace 1 through the bottom discharge outlet 4, which is connected to the top of the quenching liquid pool 2. Workpiece 8 falls into the quenching liquid pool 2 through the connecting structure 6. After entering the quenching liquid pool 2, workpiece 8 comes into contact with the quenching liquid, such as water, quenching oil, or quenching salt, to complete the quenching treatment. The quenching liquid pool 2 is equipped with a receiving device, which can be a robotic arm or a lifting device, to receive workpiece 8 falling from the deep well heating furnace 1. After quenching, workpiece 8 is taken out through the receiving device at the bottom of the quenching liquid pool 2, completing the entire quenching process. The entire working principle, through vertical hoisting and sealed connection, ensures that workpiece 8 directly enters the quenching liquid pool 2 after exiting the furnace, avoiding contact with air, thereby improving the quenching quality.

[0036] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the protection scope of the present invention.

Claims

1. A top entry bottom discharge vertical quench furnace characterized by: The furnace includes a deep well heating furnace (1), a quenching liquid pool (2), a feed inlet (3), a discharge outlet (4), a heating wire (5), and a connecting structure (6). The deep well heating furnace (1) has a feed inlet (3) at the top and a discharge outlet (4) at the bottom. The top of the quenching liquid pool (2) is connected to the discharge outlet (4) of the deep well heating furnace (1). The heating wire (5) is installed on the inner wall of the deep well heating furnace (1). The connecting structure (6) connects the deep well heating furnace (1) and the quenching liquid pool (2).

2. The up-draft vertical quenching furnace according to claim 1, wherein: The deep well heating furnace (1) has a quenching chamber with a square or round opening inside. The quenching chamber is equipped with a furnace liner (7), which is a detachable structure.

3. The up-draft vertical quenching furnace according to claim 1, wherein: The quenching liquid pool (2) is a rectangular pool, and the top of the quenching liquid pool (2) and the bottom of the deep well heating furnace (1) are connected in a sealed manner through a connecting structure (6).

4. The up-draft vertical quenching furnace according to claim 1, wherein: Both the feed inlet (3) and the discharge outlet (4) are equipped with openable furnace doors.

5. A top-in, bottom-out vertical quenching furnace as described in claim 1, characterized in that: The connecting structure (6) is an open or closed structure.

6. The up-draft vertical quenching furnace according to claim 1, wherein: It also includes a workpiece (8), which enters the quenching chamber inside the deep well heating furnace (1) through the feed port (3). The quenching liquid pool (2) is equipped with a receiving device to receive the workpiece (8) falling from the deep well heating furnace (1).

7. A top-loading vertical quenching furnace as claimed in any one of claims 1 to 6, characterized in that: The liquid level of the quenching liquid pool (2) is lower than the bottom surface of the discharge port (4). The height and size of the quenching liquid pool (2) and the deep well heating furnace (1) are adjusted according to the size of the workpiece (8).

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