A vacuum sintering furnace

Abstract

This utility model discloses a vacuum sintering furnace, relating to the field of sintering furnace technology. The sintering furnace includes a furnace body and a furnace door. The furnace body includes a vacuum container shell. Inside the vacuum container shell, from the center outwards, are arranged a molybdenum box, a graphite cylinder, and a heating element. It also includes an inlet pipe and an outlet pipe. The inlet pipe passes through the vacuum container shell and communicates with the molybdenum box, while the outlet pipe passes through the vacuum container shell and communicates with the graphite cylinder. The furnace door is hinged to the vacuum container shell via a door hinge frame. An automatic locking mechanism is also provided between the furnace door and the vacuum container shell. The automatic locking mechanism includes a door opening / closing cylinder for driving the door hinge frame to open and close, and a door rotating cylinder for driving the furnace door to rotate. Several locking pull blocks are arranged around the furnace opening of the vacuum container shell. Locking guide wheels, corresponding to the locking pull blocks, are arranged around the side of the furnace door facing the furnace opening. Locking pull blocks are provided with locking grooves for the locking guide wheels to insert into and lock the furnace door.

Description

Technical Field

[0001] This utility model relates to the field of sintering furnace technology, specifically a vacuum sintering furnace. Background Technology

[0002] Vacuum sintering furnaces are key equipment used to process alloy powders into high-performance, dense components through high-temperature sintering processes. Their core technology lies in the precise control of temperature, pressure, and atmosphere to meet the stringent material performance requirements of high-end fields such as aerospace and medical applications.

[0003] The furnace body and furnace door of a vacuum sintering furnace typically require threaded fasteners for locking to meet the sealing and high-pressure requirements of the furnace during operation. Currently, locking and opening the furnace body and furnace door usually requires manual operation. Due to the high temperatures inside the sintering furnace, manually opening the door poses a risk of burns, and the opening or locking process is also quite strenuous. Utility Model Content

[0004] The purpose of this invention is to provide a vacuum sintering furnace to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a vacuum sintering furnace, comprising a furnace body and a furnace door. The furnace body includes a vacuum container shell. Inside the vacuum container shell, a molybdenum box, a graphite square tube, and a heating element are arranged sequentially from the center outwards. It also includes an inlet pipe and an outlet pipe. The inlet pipe penetrates the vacuum container shell and communicates with the molybdenum box, while the outlet pipe penetrates the vacuum container shell and communicates with the graphite square tube. The furnace door is hinged to the vacuum container shell via a door hinge frame. An automatic locking mechanism is also provided between the furnace door and the vacuum container shell.

[0006] The automatic locking mechanism includes a furnace door opening and closing cylinder for driving the furnace door hinge frame to open and close, and a furnace door rotating cylinder for driving the furnace door to rotate. Several locking pull blocks are arranged around the furnace opening of the vacuum container shell. Locking guide wheels corresponding to the locking pull blocks are arranged around the side of the furnace door facing the furnace opening. The locking pull blocks are provided with locking grooves for the locking guide wheels to insert into and lock the furnace door.

[0007] Preferably, a heat-insulating carbon felt is also provided between the heating element and the outer shell of the vacuum container.

[0008] Preferably, the graphite tube is fixedly connected to the vacuum container shell via a graphite tube support graphite rod.

[0009] Preferably, the graphite tube is fixedly connected to the vacuum container shell via a graphite tube support graphite rod.

[0010] Preferably, the heating element is fixed to the insulating carbon felt by a heating element support ceramic seat.

[0011] Preferably, the molybdenum box is fixedly connected to the graphite square tube via a ceramic support for the molybdenum box.

[0012] Preferably, the molybdenum box is provided with a molybdenum box vent baffle on the front and rear sides, and the molybdenum box vent baffle is provided with a vent hole.

[0013] Preferably, a hinge fixing lug is provided on the outer surface of the vacuum container shell near the furnace opening, one end of the furnace door hinge frame is hinged to the hinge fixing lug, and the other end of the furnace door hinge frame is connected to the furnace door.

[0014] Preferably, a joint bearing is provided at the center of the furnace door, the furnace door hinge frame is rotatably connected to the joint bearing via a connecting shaft, one end of the furnace door rotating cylinder is hinged to the furnace door hinge frame, and the other end of the furnace door rotating cylinder is hinged to the furnace door.

[0015] Preferably, the furnace door is provided with a limiting pin, the furnace door hinge is provided with a limiting plate, the limiting plate is provided with a limiting groove with an arc-shaped structure, and the limiting pin is located in the limiting groove.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. In this utility model, an automatic locking mechanism is provided between the furnace body and the furnace door. Through the automatic locking mechanism, the furnace door of the sintering furnace can be automatically unlocked and opened, and automatically closed and locked. There is no need to manually adjust the furnace door opening and closing or locking and unlocking, avoiding the risk of burns and saving time and effort.

[0018] 2. The design of the molybdenum box in this utility model, and the design of the ventilation holes corresponding to the gas outlet baffles at both ends of the molybdenum box, can ensure that the molybdenum box forms a slight positive pressure, preventing carbon-containing gases from entering the molybdenum box, ensuring that the environment inside the molybdenum box meets the requirements for titanium alloy sintering, and better realizing vacuum sintering of titanium alloys. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ;

[0020] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 ;

[0021] Figure 3 This is a structural diagram of the molybdenum box exhaust baffle and vent hole of this utility model;

[0022] Figure 4 This is a diagram illustrating the arrangement of the rubber sealing ring of this utility model;

[0023] Figure 5 This diagram shows the fit between the locking guide wheel and the locking pull block of this utility model (locked state).

[0024] Figure 6 This diagram shows the fit between the locking guide wheel and the locking groove of this utility model.

[0025] Figure 7 This is a schematic diagram of the structure of the present invention. Figure 3 (Furnace door open);

[0026] Figure 8 This is a schematic diagram of the structure of the present invention. Figure 4 (Furnace door closed);

[0027] Figure 9 This diagram shows the fit between the locking guide wheel and the locking pull block of this utility model (unlocked state).

[0028] In the picture:

[0029] 1-Vacuum container shell, 2-Furnace door, 3-Locking pull block, 31-Locking groove, 4-Locking guide wheel, 5-Furnace door hinge frame, 51-Limiting plate, 52-Limiting groove, 53-Connecting shaft, 6-Furnace door rotating cylinder, 7-Furnace door opening and closing cylinder, 8-Hinge fixing ear, 9-Spherical bearing, 10-Limiting pin, 11-Rubber sealing ring, 12-Molybdenum box, 13-Graphite square tube, 14-Heating element, 15-Outlet pipe, 16-Inlet pipe, 17-Molybdenum box ceramic support seat, 18-Molybdenum box outlet baffle, 181-Vent hole, 19-Insulating carbon felt, 20-Heating element supporting ceramic support seat, 21-Graphite square tube supporting graphite rod. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] like Figures 1 to 9 As shown, a vacuum sintering furnace includes a furnace body and a furnace door 2. The furnace body includes a vacuum container shell 1. Inside the vacuum container shell 1, a molybdenum box 12, a graphite square tube 13, and a heating element 14 are arranged sequentially from the center outwards. It also includes an inlet pipe 16 and an outlet pipe 15. The inlet pipe 16 passes through the vacuum container shell 1 and communicates with the molybdenum box 12. The outlet pipe 15 passes through the vacuum container shell 1 and communicates with the graphite square tube 13.

[0032] The furnace door 2 is hinged to the vacuum container shell 1, and an automatic locking mechanism is also provided between the furnace door 2 and the vacuum container shell 1.

[0033] Furthermore, a heat-insulating carbon felt 19 is provided between the heating element 14 and the vacuum container shell 1 for heat insulation and heat preservation, reducing heat loss during metal sintering and improving sintering efficiency.

[0034] Specifically, in this embodiment, the graphite square tube 13 is fixedly connected to the vacuum container shell 1 via the graphite square tube supporting the graphite rod 21.

[0035] Specifically, in this embodiment, the heating element 14 is fixed on the heat-insulating carbon felt 19 by the heating element support ceramic seat 20, and the heating surface of the heating element 14 is in close contact with the surface of the graphite square tube 13. In this embodiment, the heating element 14 is a prior art, such as a resistance heater, induction heater (electromagnetic heater), microwave hot gas heater, gas heater, infrared / radiation heater, plasma heater, laser / electron beam heater, etc., and can be adapted to the actual application of the sintered metal.

[0036] Specifically, in this embodiment, the molybdenum box 12 is fixedly connected to the graphite square tube 13 via a ceramic support 17.

[0037] Specifically, in this embodiment, molybdenum box 12 is provided with molybdenum box outlet baffles 18 on the front and rear sides respectively. The molybdenum box outlet baffles 18 are provided with vent holes 181. After high-purity inert gas (argon) is introduced into the molybdenum box 12, it enters the graphite square tube 13 through the vent holes 181, and finally enters the outlet pipe 15 from the graphite square tube 13 and is parallel to the furnace body.

[0038] Replacing the traditional graphite box with a molybdenum box for heating, the high-purity inert gas (argon) enters the molybdenum box 12 via the following path: Argon enters the molybdenum box 12 through the inlet pipe 16 at the bottom of the vacuum container shell 1, which connects to the molybdenum box 12. It then enters the graphite cylinder 13 through the vent holes 181 corresponding to the molybdenum box outlet baffles 18 at both ends of the molybdenum box 12. A vacuum pump extracts the argon from the graphite cylinder 13, and it finally exits through the outlet pipe 15 and flows out of the furnace body. The design of the vent holes 181 corresponding to the molybdenum box outlet baffles 18 at both ends of the molybdenum box 12 ensures a slight positive pressure (the gas pressure inside the molybdenum box 12 is greater than the gas pressure outside the molybdenum box 12). Carbon-containing gases from outside the molybdenum box 12 cannot enter. This ensures that the environment inside the molybdenum box 12 meets the requirements for titanium alloy sintering, better enabling vacuum sintering of titanium alloys.

[0039] Specifically, the molybdenum box vent baffle 18 is connected to the molybdenum box 12 by hinge or snap-fit, so that sintering material can be added into the molybdenum box 12 by opening the molybdenum box vent baffle 18.

[0040] In one specific embodiment, the furnace door 2 is hinged to the vacuum container shell 1 via a furnace door hinge frame 5. Specifically, a hinge fixing lug 8 is provided on the outer surface of the vacuum container shell 1 near the furnace opening. One end of the furnace door hinge frame 5 is hinged to the hinge fixing lug 8, and the other end of the furnace door hinge frame 5 is connected to the furnace door 2.

[0041] In one specific embodiment, the automatic locking mechanism includes a furnace door opening and closing cylinder 7 for driving the furnace door hinge frame 5 to open and close, and a furnace door rotating cylinder 6 for driving the furnace door 2 to rotate. Several locking pull blocks 3 are arranged around the furnace opening of the vacuum container shell 1. Locking guide wheels 4 corresponding to the locking pull blocks 3 are arranged around the side of the furnace door 2 facing the furnace opening. The locking pull blocks 3 are provided with locking grooves 31 for the locking guide wheels 4 to be inserted into and lock the furnace door 2.

[0042] Specifically, the furnace door opening and closing cylinder 7 is a hydraulic cylinder. One end of the furnace door opening and closing cylinder 7 is hinged to the outer shell 1 of the vacuum container, and the other end of the furnace door opening and closing cylinder 7 is hinged to the furnace door hinge frame 5. In this way, the extension and retraction of the furnace door opening and closing cylinder 7 drives the furnace door hinge frame 5 to rotate, and the rotation of the furnace door hinge frame 5 forms the opening and closing action of the furnace door 2.

[0043] Specifically, a spherical bearing 9 is centrally located on the furnace door 2. The furnace door hinge frame 5 is rotatably connected to the spherical bearing 9 via a connecting shaft 53. One end of the furnace door rotating cylinder 6 is hinged to the furnace door hinge frame 5, and the other end is hinged to the furnace door 2. It should be noted that the axes of the hinge shafts at both ends of the furnace door rotating cylinder 6 are parallel to the axis of the connecting shaft 53. Thus, the extension and retraction of the furnace door rotating cylinder 6 can rotate the furnace door 2. During the rotation of the furnace door 2, the locking guide wheel 4 enters or exits the corresponding locking groove 31 of the locking pull block 3. When the locking guide wheel 4 enters the corresponding locking groove 31, a lock is formed between the furnace door 2 and the vacuum container shell 1. When the locking guide wheel 4 does not enter the corresponding locking groove 31, or moves out of the corresponding locking groove 31, the lock between the furnace door 2 and the vacuum container shell 1 is released. At this time, the furnace door opening and closing cylinder 7 can be used to open and close the furnace door hinge frame 5 and the furnace door 2, thereby opening or closing the furnace door.

[0044] Furthermore, the furnace door 2 is provided with a limiting pin 10, and the furnace door hinge frame 5 is provided with a limiting plate 51. The limiting plate 51 is provided with a limiting groove 52 with an arc-shaped structure, and the limiting pin 10 is located in the limiting groove 52. It should be noted that the limiting groove 52 with an arc-shaped structure is coaxially arranged with the connecting shaft 53. In this way, when the furnace door 2 is rotated, the limiting pin 10 can move along the limiting groove 52. The limiting groove 52 limits the rotation angle of the furnace door 2 through the limiting pin 10, ensuring that the furnace door 2 can be rotated and adjusted within a stable rotation range.

[0045] Furthermore, a rubber sealing ring 11 is provided on the side of the vacuum container shell 1 facing the furnace opening to increase the sealing performance between the vacuum container shell 1 and the furnace door 2 when closed.

[0046] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A vacuum sintering furnace, characterized in that: The furnace includes a furnace body and a furnace door. The furnace body includes a vacuum container shell. Inside the vacuum container shell, a molybdenum box, a graphite cylinder, and a heating element are arranged sequentially from the center outwards. It also includes an inlet pipe and an outlet pipe. The inlet pipe passes through the vacuum container shell and communicates with the molybdenum box, and the outlet pipe passes through the vacuum container shell and communicates with the graphite cylinder. The furnace door is hinged to the vacuum container shell via a door hinge frame. An automatic locking mechanism is also provided between the furnace door and the vacuum container shell. The automatic locking mechanism includes a furnace door opening and closing cylinder for driving the furnace door hinge frame to open and close, and a furnace door rotating cylinder for driving the furnace door to rotate. Several locking pull blocks are arranged around the furnace opening of the vacuum container shell. Locking guide wheels corresponding to the locking pull blocks are arranged around the side of the furnace door facing the furnace opening. The locking pull blocks are provided with locking grooves for the locking guide wheels to insert into and lock the furnace door.

2. The vacuum sintering furnace according to claim 1, characterized in that: A heat-insulating carbon felt is also provided between the heating element and the outer shell of the vacuum container.

3. The vacuum sintering furnace according to claim 1, characterized in that: The graphite tube is fixedly connected to the outer shell of the vacuum container by supporting the graphite rod.

4. A vacuum sintering furnace according to claim 2, characterized in that: The graphite tube is fixedly connected to the outer shell of the vacuum container by supporting the graphite rod.

5. A vacuum sintering furnace according to claim 2, characterized in that: The heating element is fixed to the heat-insulating carbon felt by a heating element support ceramic seat.

6. A vacuum sintering furnace according to claim 1, characterized in that: The molybdenum box is fixedly connected to the graphite square tube via a ceramic support for the molybdenum box.

7. A vacuum sintering furnace according to claim 1, characterized in that: The molybdenum box is provided with vent baffles on the front and rear sides, and the vent baffles are provided with ventilation holes.

8. A vacuum sintering furnace according to claim 1, characterized in that: The outer surface of the vacuum container shell is provided with a hinge fixing lug on the side near the furnace opening. One end of the furnace door hinge frame is hinged to the hinge fixing lug, and the other end of the furnace door hinge frame is connected to the furnace door.

9. A vacuum sintering furnace according to claim 8, characterized in that: A joint bearing is provided at the center of the furnace door. The furnace door hinge frame is rotatably connected to the joint bearing via a connecting shaft. One end of the furnace door rotating cylinder is hinged to the furnace door hinge frame, and the other end of the furnace door rotating cylinder is hinged to the furnace door.

10. A vacuum sintering furnace according to claim 9, characterized in that: The furnace door is provided with a limit pin, and the furnace door hinge is provided with a limit plate. The limit plate is provided with a limit groove with an arc-shaped structure, and the limit pin is located in the limit groove.

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