Heat treatment furnace for casting

Abstract

A heat treatment furnace for casting comprises a furnace body used for containing a casting and a furnace door rotationally arranged on the furnace body, a door opening mechanism is arranged on the furnace door, the furnace door rotates with the lower portion of the furnace door as the axis, and the door opening mechanism comprises a driving assembly arranged above the furnace body and a damping piece arranged below the furnace door. The driving assembly is connected above the furnace door and used for driving the furnace door to rotate with the lower portion of the furnace door as the axis, and one end of the damping piece is connected to the furnace door and provides supporting force opposite to the rotating direction for the furnace door when the driving assembly drives the furnace door to be opened or closed. The furnace door has the advantages that through the synergistic effect of the driving assembly and the damping piece, reverse torque is formed to restrain gravitational acceleration when the furnace door is opened, and impact damage caused by rapid falling of the furnace door due to self weight is avoided.

Description

Technical Field

[0001] This utility model relates to a heat treatment device, and more particularly to a heat treatment furnace for casting. Background Technology

[0002] In the casting industry, heat treatment furnaces are widely used in the heating, holding, and cooling processes of metallic materials to improve their mechanical properties or eliminate internal stress. Heat treatment furnaces are typically used for processes such as annealing, normalizing, quenching, or tempering of castings to ensure the material achieves the required hardness, toughness, and wear resistance. During operation, the workpiece is placed inside the furnace chamber, heated to a set temperature by heating elements, held for a certain period, and then cooled. After heat treatment, the furnace door needs to be opened to remove the workpiece and prepare for the next batch of processing. However, existing heat treatment equipment has significant design deficiencies, especially in the furnace door opening process.

[0003] In existing technologies, after heat treatment, the furnace door is difficult to open manually due to the high temperature and sealing design, resulting in cumbersome and inefficient operation. Furthermore, the lack of a damping device when opening the door means it relies entirely on the operator for support and control, and the typically heavy door further complicates the process. This design not only reduces overall operational efficiency but also exposes operators to higher labor intensity and potential safety risks, such as injuries from falling or being pinched due to loss of balance. Improvements are urgently needed to enhance safety and ease of use. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a casting heat treatment furnace that does not require manual opening by operators.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a heat treatment furnace for casting, comprising a furnace body for placing castings and a furnace door rotatably mounted on the furnace body. The furnace door is provided with an opening mechanism, and the furnace door rotates with its lower part as an axis. The opening mechanism includes a drive assembly mounted above the furnace body and a damping component mounted below the furnace door. The drive assembly is connected above the furnace door and is used to drive the furnace door to rotate with its lower part as an axis. One end of the damping component is connected to the furnace door and provides a supporting force opposite to the direction of rotation to the furnace door when the drive assembly drives the furnace door to open or close.

[0006] The beneficial effects of this invention are as follows: Through the synergistic effect of the drive component and the damping component, a reverse torque is generated when the furnace door is opened to suppress gravitational acceleration, preventing the furnace door from falling rapidly due to its own weight and causing impact damage. This is especially suitable for the safety control of large furnace doors. When closing, the reverse support force of the damping component is converted into an auxiliary thrust to compensate for the attenuation range of the output torque of the drive component, ensuring the stability of the closing action. As a preferred method, a variable cross-section torsion spring can be used as the core component of the damping component. Its helical radius is designed to gradually change along the axial direction. When the rotation angle of the furnace door increases, the effective number of spring coils decreases, resulting in a non-linear increase in stiffness, thereby accurately matching the torque requirements of different opening and closing stages. This structure achieves dynamic damping adjustment through a purely mechanical means without the need for a complex hydraulic or electronic control system, while reducing maintenance costs.

[0007] Furthermore, as the opening degree of the furnace door increases during the opening process, the supporting force provided by the damping component to the furnace door also increases.

[0008] This technical solution utilizes a gradient change in damping force to create a progressive buffer. When the furnace door is opened to its maximum angle, the supporting force reaches its peak, completely offsetting the door's gravitational torque and achieving reliable hovering at any opening angle. In practical implementation, a multi-stage inclined friction mechanism can be incorporated within the damping component. As the extension length of the support rod increases, the inclined contact area gradually expands, and the frictional resistance increases exponentially. For example, a combination of wedge blocks and rollers can be used. The displacement of the rollers within the wedge groove is positively correlated with the furnace door opening angle, and the self-locking effect generated by geometric interference enhances the damping effect. This design not only reduces the impact risk during high-speed opening but also prevents pinching injuries caused by inertial collisions during personnel operation.

[0009] Furthermore, the damping element includes a cylinder and a support rod telescopically disposed in the cylinder. The cylinder has a support that rests against the bottom of the support rod. When the support rod moves toward the bottom of the cylinder, the support force provided by the support increases accordingly. The end of the support rod away from the cylinder is hinged to the furnace door. The damping element is symmetrically disposed on both sides of the furnace door.

[0010] The hinged structure allows the support rod to effectively accommodate the combined displacements generated during furnace door rotation. The support can be filled with a porous medium material, such as a compressed layer of metal foam with a decreasing porosity along the axial direction. When the support rod is compressed, the dense areas of the metal foam generate nonlinear deformation resistance, a characteristic that can be precisely controlled by adjusting the pore gradient. A symmetrical arrangement further eliminates structural eccentricity caused by single-point stress by distributing the load evenly through dual damping channels.

[0011] Furthermore, the drive assembly is symmetrically arranged on both sides of the furnace body. The drive assembly includes a reel on the side of the furnace door, a winding drive unit on the top of the furnace body, and drive ropes fixed at both ends to the reel and the winding drive unit, respectively.

[0012] The dual-drive system achieves torque balance through synchronous control, avoiding furnace door distortion caused by unilateral traction. As a preferred approach, the reel can employ a variable-diameter spiral groove design, where the winding radius varies with the amount of rope unwinding, creating a cosine function relationship between the driving torque and the furnace door rotation angle, matching the curve of gravitational torque variation. For example, a large radius section is used to quickly build torque in the initial opening phase, a medium radius section maintains constant speed in the middle phase, and a small radius section achieves precise control in the later stage. This mechanical adaptive adjustment reduces motor power requirements compared to traditional constant-diameter reels while improving motion smoothness.

[0013] Furthermore, the door opening mechanism also includes several sets of locking components spaced apart on the furnace body near the furnace door. Each locking component includes a telescopic cylinder, with an unlocking rod at the front end of the telescopic cylinder and a hook at the front end of the unlocking rod. The furnace door has a corresponding latching groove on the hook. When the hook is released from locking with the latching groove, the unlocking rod abuts against the furnace door and pushes the furnace door to rotate.

[0014] The multi-level locking mechanism achieves load distribution through distributed locking points, with each locking component independently bearing local stress. The unlocking lever employs a dual-action design, automatically converting into a thrust lever the moment the lock is released. As a preferred method, the inner wall of the groove can be coated with a ceramic coating to maintain a stable coefficient of friction even at high temperatures, ensuring reliable unlocking in emergencies. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0016] Figure 2 This is a side view of an embodiment of the present utility model;

[0017] Figure 3 This is a partial enlarged view of the locking component in an embodiment of this utility model;

[0018] Figure 4 This is a cross-sectional view of the damping component in an embodiment of this utility model. Detailed Implementation

[0019] This utility model embodiment provides a heat treatment furnace for casting, such as... Figure 1-4As shown: The furnace includes a furnace body 1 for placing castings and a furnace door 2 rotatably mounted on the furnace body 1. The furnace door 2 is equipped with an opening mechanism 3, which enables smooth opening and closing of the furnace door 2. The furnace door 2 rotates around its lower axis, and the opening mechanism 3 includes a drive assembly 4 mounted above the furnace body 1 and a damping element 5 mounted below the furnace door 2. The drive assembly 4 is connected above the furnace door 2 and drives the furnace door 2 to rotate around its lower axis. One end of the damping element 5 is connected to the furnace door 2, providing a supporting force opposite to the direction of rotation when the drive assembly 4 opens or closes the furnace door 2.

[0020] During the opening of the furnace door 2, the damping element 5 provides an increasing supporting force to the furnace door 2 as the opening degree of the furnace door 2 increases. This design allows the furnace door 2 to open more smoothly, avoiding safety accidents caused by sudden loss of support. Specifically, the damping element 5 includes a cylinder 51 and a support rod 52 telescopically disposed within the cylinder 51. Inside the cylinder 51, there is a support 53 abutting against the bottom of the support rod 52. Specifically, the support 53 can be a fluid or a gas. When the support rod 52 moves towards the bottom of the cylinder 51, the supporting force provided by the support 53 to the support rod 52 increases accordingly. The end of the support rod 52 away from the cylinder 51 is hinged to the furnace door 2, and the damping elements 5 are symmetrically disposed on both sides of the furnace door 2, thereby ensuring that the furnace door 2 is subjected to uniform force during opening and closing.

[0021] The drive assembly 4 is symmetrically arranged on both sides of the furnace body 1. It mainly includes a reel 41 on the side of the furnace door 2, a winding drive 42 on top of the furnace body 1, and a drive rope 43 with its two ends fixed to the reel 41 and the winding drive 42 respectively. When the winding drive 42 operates, it pulls the reel 41 via the drive rope 43, thereby causing the furnace door 2 to rotate around its lower axis, thus opening or closing the furnace door 2. Furthermore, to further improve the operational safety of the furnace door 2, the opening mechanism 3 also includes several sets of locking assemblies 6 spaced apart on the furnace body 1 near the furnace door 2. Each locking assembly 6 includes a telescopic cylinder 61, with an unlocking rod 62 at its front end and a hook 63 at its front end. A corresponding latching groove 21 is provided on the furnace door 2 corresponding to the hook 63. When the furnace door 2 needs to be opened, the unlocking rod 62 pushes the hook 63 to release the lock between it and the latching groove 21, and in this process, it abuts against the furnace door 2, thereby pushing the furnace door 2 to begin rotating.

[0022] The working principle of this heat treatment furnace is as follows: When the furnace door 2 needs to be opened, the winding drive unit 42 is activated, and the drive rope 43 pulls the furnace door 2 through the reel 41, causing it to rotate around the axis below the furnace door 2. At the same time, the support rod 52 in the damping component 5 gradually retracts into the cylinder 51 as the furnace door 2 rotates, and the supporting force provided by the support 53 gradually increases, thereby effectively balancing the weight of the furnace door 2 and making it open smoothly. Conversely, when closing the furnace door 2, the drive component 4 operates in the opposite direction, and the damping component 5 also provides a supporting force opposite to the direction of rotation, ensuring that the furnace door 2 closes slowly and smoothly. When the furnace door 2 is close to being fully closed, the telescopic cylinder 61 in the locking component 6 pushes the release rod 62, causing the hook 63 to engage in the latching groove 21, thereby achieving a seal on the furnace door 2.

[0023] The above embodiments are merely one preferred embodiment of the present utility model. Ordinary changes and substitutions made by those skilled in the art within the scope of the present utility model's technical solution are all included within the protection scope of the present utility model.

Claims

1. A heat treatment furnace for casting, comprising a furnace body for placing a casting and a furnace door which is rotatably provided on the furnace body, characterized in that: The door opening mechanism is arranged above the furnace body and below the furnace door, the driving assembly is connected above the furnace door and used to drive the furnace door to rotate about the lower part of the furnace door as the shaft, and the damping member is connected to the furnace door at one end and provides a support force opposite to the rotating direction for the furnace door when the driving assembly drives the furnace door to open or close.

2. The heat treatment furnace for casting according to claim 1, characterized by: The damping member provides a support force for the furnace door, which increases with the increase of the opening degree of the furnace door during the opening process of the furnace door.

3. The heat treatment furnace for casting according to claim 2, characterized by: The damping member includes a cylinder and a support rod telescopically arranged in the cylinder, the cylinder has a support object inside and abuts against the lower part of the support rod, the support object provides a support force for the support rod, which increases when the support rod moves towards the bottom of the cylinder, the end of the support rod away from the cylinder is hinged to the furnace door, and the damping member is symmetrically arranged on both sides of the furnace door.

4. The heat treatment furnace for casting according to claim 1, characterized by: The driving assembly is symmetrically arranged on both sides of the furnace body, the driving assembly includes a wire wheel arranged on the side of the furnace door, a wire winding driving member arranged above the furnace body, and a driving rope fixed at both ends of the wire winding driving member and the wire wheel.

5. The heat treatment furnace for casting according to claim 4, characterized in that: The door opening mechanism further includes a plurality of groups of locking assemblies arranged on the furnace body near the side of the furnace door, the locking assembly includes a telescopic cylinder, the front end of the telescopic cylinder is provided with a tripping lever, the front end of the tripping lever is provided with a hook, the furnace door is provided with a buckle groove corresponding to the hook, and the tripping lever abuts against the furnace door and pushes the furnace door to rotate when the hook is unlocked from the buckle groove.

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