A high-temperature vacuum visual sintering equipment

Abstract

The present invention provides a high-temperature vacuum visual sintering device, comprising: a furnace body; a furnace cover is detachably mounted on the furnace body; a sintering chamber for storing blanks is provided in the furnace body; a heating element for sintering the blanks into workpieces is provided in the sintering chamber; and further comprising: a cooling circulation system, comprising a cooling component and a heat exchange component for heat exchanging the heat of the cooling component; the cooling component passes through the furnace body and is connected to the inner cavity of the heating element, and is used to cool the heating element, the sintering chamber and the workpiece after sintering; the heat exchange component is arranged outside the furnace body; a vacuum system is arranged on the furnace body, and its evacuation interface is connected to the furnace body cavity to control the sintering gas pressure and the sintering state of the atmosphere in the furnace; a monitoring system; a through hole is provided on the side wall of the sintering chamber for the monitoring system to pass through, the monitoring system extends into the furnace body and faces the through hole, and its monitoring end and the material placement end of the workpiece in the sintering chamber are located on the same horizontal extension line; and is used to monitor and record the shape changes of the sintered blanks in the sintering chamber in real time.

Description

Technical Field

[0001] The present invention relates to the technical field of sintering furnaces, and in particular to high-temperature vacuum visual sintering equipment. Background Art

[0002] A sintering furnace heats powders of metals, ceramics, and some refractory metal intermediate compounds in a vacuum and protective atmosphere to produce a dense material with a certain density and mechanical properties. Medium-frequency induction heating is a well-established form of electric heating. It utilizes Faraday's principle of electromagnetic induction to convert electrical energy into heat energy. A three-phase power supply is converted into a medium-frequency alternating current via a medium-frequency induction power supply. When this alternating current passes through an induction coil, it generates an alternating induced magnetic field—an alternating magnetic flux whose magnitude and direction change over time. When a conductive metal is placed within the induction coil, Faraday's law of electromagnetic induction generates an induced electromotive force (EMF) within the metal. Since metals are conductors, the induced EMF generates an induced current, called eddy current. According to Joule-Lenz's law, eddy currents flowing through a metal with a certain resistance generate a certain amount of heat, thereby heating the metal.

[0003] Common two-chamber sintering furnaces primarily separate the sintering chamber from the cooling chamber using partitions such as gate valves or insulated doors. This configuration requires a corresponding material conveying mechanism within the sintering chamber. For example, patent application number 20121058013.2 discloses a vacuum dual-chamber high-pressure gas quenching furnace. This gas quenching furnace utilizes an integrated structure with insulated doors and a reciprocating mechanism. However, this mechanism is complex and results in slow cooling. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention provides a high-temperature vacuum visual sintering device with a simple structure and good cooling effect.

[0005] According to an embodiment of the present invention, a high-temperature vacuum visual sintering device includes: a furnace body; a furnace cover is detachably mounted on the top of the furnace body; a sintering chamber is provided in the furnace body for storing blanks; a heating element is provided in the sintering chamber for sintering the blanks into workpieces; and further includes:

[0006] The cooling circulation system includes a cooling component and a heat exchange component for heat exchange with the cooling component; the cooling component passes through the furnace body and is connected to the inner cavity of the heating element, and is used to cool the heating element, the sintering chamber and the workpiece after sintering; the heat exchange component is arranged outside the furnace body;

[0007] Vacuum system; installed on the furnace body, and its vacuum interface is connected to the furnace cavity, used to control the sintering gas pressure and atmosphere in the furnace;

[0008] Monitoring system; a through hole for the monitoring system to pass through is opened on the side wall of the sintering chamber. The monitoring system extends into the furnace body and faces the through hole, and its monitoring end is located on the same horizontal extension line as the placement end of the workpiece in the sintering chamber; it is used to monitor and record the shape changes of the sintered blank in the sintering chamber in real time.

[0009] As a preferred solution of the present invention, a heat-insulating blocking member is movably installed between the cooling assembly and the heating element.

[0010] Furthermore, the cooling component includes: a connecting valve and a through pipe; the through pipe is connected to the heating element through the connecting valve, and the insulating plug is fixed on the connecting valve; V-shaped heat exchange plates are arranged at one-way intervals in the through pipe to further improve the heat exchange efficiency of the through pipe.

[0011] Furthermore, the heat exchange assembly includes: a heat exchange box and a cooling box; the heat exchange box and the cooling box are both filled with coolant; the through pipe is S-shaped and passes through the cooling box and the heat exchange box in sequence;

[0012] As a preferred solution of the present invention, an automatic inflation device is also installed in the furnace body, and a deflation device is installed on the furnace cover; a heat exchange tube is inserted into the deflation device; the movable end of the heat exchange tube extends into and out of the heat exchange box to the outside of the furnace body.

[0013] As a preferred solution of the present invention, the heating element is made of a long strip of tungsten-molybdenum alloy with a hollow structure; and openings are provided at intervals on the heating element.

[0014] Furthermore, a furnace cover opening device is installed between the furnace cover and the furnace body, and the furnace cover opening device is a locking structure for easy manual opening or locking.

[0015] As a preferred solution of the present invention, a temperature measuring device is further installed on the furnace body; the temperature measuring device extends vertically into the sintering chamber to facilitate monitoring the heating temperature in the sintering chamber.

[0016] Furthermore, the monitoring system includes: a light source system, an industrial camera, and a thermal insulation filter; the light source system and the industrial camera are arranged on the furnace body outside the through hole opposite to each other, and a thermal insulation filter is arranged between the light source system and the through hole, and between the industrial camera and the through hole.

[0017] Furthermore, a heat preservation table is provided in the sintering chamber; a storage rack is installed on the heat preservation table; the storage rack is at the same horizontal extension as the light source system and the industrial camera, so that the industrial camera can accurately capture image information of the workpiece during sintering.

[0018] Beneficial effects:

[0019] 1. Since the cooling component in the cooling circulation system is directly connected to the inner cavity of the heating element, the coolant can be recycled to save energy; and the heating element, sintering chamber, and workpiece after sintering are effectively cooled. In addition, the heat exchange component is used to exchange heat with the cooling component, driving the heating element to gradually cool down, playing a cooling and protective role on the heating element body, sintering chamber and workpiece, further ensuring the molding quality of the workpiece.

[0020] 2. Reduce unnecessary heat loss by installing an insulating block between the cooling component and the heating element.

[0021] 3. In addition, since there are several openings on the heating element, uniform and effective heating is achieved while facilitating real-time data acquisition by the monitoring system through the multi-hole imaging principle. The imaging boundary has high clarity and is easy to observe. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the main structure of an embodiment of the present invention;

[0023] Figure 2 Schematic diagram of the external overall structure of an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the specific structure of the sintering chamber in Example 1 of the present invention;

[0025] Figure 4 This is a schematic diagram of the specific structure of the sintering chamber in Example 2 of the present invention;

[0026] Figure 5 Schematic diagram of the specific structure of the cooling circulation system in the present invention;

[0027] Figure 6 Schematic diagram of the structure of the heating element in the present invention.

[0028] In the above drawings: 1. furnace body; 11. furnace cover; 12. sintering chamber; 121. through hole; 13. heating element; 131. opening; 14. furnace cover opening device; 2. cooling circulation system; 21. cooling component; 211. connecting valve; 212. through pipe; 213. heat exchange plate; 22. heat exchange component; 221. heat exchange box; 222. cooling box; 3. vacuum system; 4. monitoring system; 41. light source system; 42. industrial camera; 43. thermal insulation filter; 5. thermal insulation plug; 6. automatic inflation device; 7. deflation device; 71. heat exchange tube; 8. temperature measuring device; 9. insulation table; 91. storage rack. DETAILED DESCRIPTION

[0029] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0030] like Figure 1-4 As shown, a high-temperature vacuum visual sintering device includes: a furnace body 1; a furnace cover 11 is detachably mounted on the top of the furnace body 1; a sintering chamber 12 for storing blanks is provided in the furnace body 1; a heating element 13 for sintering the blanks into workpieces is provided in the sintering chamber 12; and further includes:

[0031] The cooling circulation system 2 includes a cooling component 21 and a heat exchange component 22 for heat exchange with the cooling component 21; the cooling component 21 passes through the furnace body 1 and communicates with the inner cavity of the heating element 13, and is used to cool the heating element 13, the sintering chamber 12 and the workpiece after sintering;

[0032] The vacuum system 3 is provided on the furnace body 1, and its evacuation interface is connected to the cavity of the furnace body 1, and is used to control the sintering state of the sintering gas pressure and atmosphere in the furnace;

[0033] Monitoring system 4; a through hole 121 is provided on the side wall of the sintering chamber 12 for the monitoring system 4 to pass through. The two through holes 121 are arranged opposite to each other and pass through the side wall of the sintering chamber 12. The monitoring system 4 extends into the furnace body 1 and faces the through holes 121. Its monitoring end and the placing end of the workpiece placed in the sintering chamber 12 are located on the same horizontal extension line, so as to accurately collect the imaging information of the blank and monitor and record the shape changes of the sintered blank in the sintering chamber 12 in real time.

[0034] like Figure 3 As shown, the heating element 13 in Example 1 is arranged at the top of the inner cavity of the sintering chamber 12, so that the cooling component 21 needs to be connected to the connection port on the left to connect to the inner cavity of the heating element 13, which is used to cool the heating element 13, the sintering chamber 12 and the workpiece after sintering.

[0035] like Figure 4 As shown, the installation end of the heating element 13 in Example 2 is set in the furnace body 1, so that the cooling component 21 is set in the furnace body 1 and connected to the inner cavity of the heating element 13, which is used to cool the heating element 13, the sintering chamber 12 and the workpiece after sintering.

[0036] like Figure 1 As shown, a heat-insulating plug 5 is movably installed between the cooling assembly 21 and the heating element 13. The heat-insulating plug 5 is made of graphite to prevent the heating element 13 from losing heat and increasing heat energy consumption during the heating operation.

[0037] like Figure 5As shown, the cooling component 21 includes: a connecting valve 211 and a through pipe 212; the through pipe 212 is connected to the heating element 13 through the connecting valve 211, and the insulating plug 5 is fixed on the connecting valve 211, wherein the connecting valve 211 is an electric clamp sealing valve connected to the power controller in the furnace body 1; a V-shaped heat exchange plate 213 is arranged at a one-way interval in the through pipe 212 to further limit the flow rate of the coolant in the through pipe 212, thereby promoting effective energy conversion between the coolant in the through pipe 212 and the heat exchange component 22.

[0038] like Figure 5 As shown, the heat exchange assembly 22 includes: a heat exchange box 221 and a cooling box 222; both the heat exchange box 221 and the cooling box 222 are filled with coolant (i.e., natural water); the through pipe 212 is S-shaped in the cooling box 222 and vertically passes through the heat exchange box 221 to achieve cooling and energy conversion operations of the through pipe 212 body.

[0039] like Figure 1 As shown, the furnace body 1 is also equipped with an automatic gas filling device 6 (this is the existing technology in the existing sintering furnace, which is used to fill the furnace body 1 with nitrogen to promote the cooling of the sintering chamber 12, which will not be described in detail here). The furnace cover 11 is equipped with a degassing device 7 to drive the air pressure in the furnace body 1 to recover and facilitate opening the furnace cover 11; a heat exchange tube 71 is inserted into the degassing device 7; the movable end of the heat exchange tube 71 extends into and out of the heat exchange box 221 to the outside of the furnace body 1; the heat exchange process is as follows: when the workpiece completes the sintering operation, nitrogen is filled into the furnace body 1 through the automatic gas filling device 6, and the nitrogen passes through the sintering chamber 12 and then from the degassing device 7 The nitrogen is discharged from the heat exchanger 221 through the heat exchange pipe 71. The coolant in the heat exchanger 221 is heated and the temperature rises. At this time, the through pipe 212 is running. The through pipe 212 is filled with coolant, and an air extraction pump is provided between the through pipe 212 and the furnace body 1 to facilitate the circulation of the coolant. After the through pipe 212 flows from the cooling box 222 and passes through the heat exchanger 221, it passes through the furnace body 1 and is connected to the heating element 13 through the connecting valve 211, driving the heating element 13 to gradually cool down. The heating element 13 then flows the coolant out of the through pipe 212 to repeat the cycle. In actual operation, the connection between the through pipe 212 and the air extraction pump is set as a three-way pipe, so that when the coolant in the through pipe 212 is overheated, new coolant can be filled in to replace it to continue the cooling operation.

[0040] like Figure 1 、 4 As shown, the heating element 13 is made of a long strip of tungsten-molybdenum alloy with a hollow structure, so as to further improve the heat resistance of the heating element 13 itself. The heating element 13 made of tungsten-molybdenum alloy will not precipitate carbides when heated, so as to further improve the service life of the sintering chamber 12; Figure 6As shown, openings 131 are provided at intervals on the heating element 13, and the heating element 13 is arranged in a long strip shape in the sintering chamber 12 to achieve uniform heating. The multiple openings 131 are provided thereon and adopt the principle of multi-hole imaging so that the monitoring system 4 can collect clear data.

[0041] like Figure 1 As shown, a furnace cover opening device 14 is installed between the furnace cover 11 and the furnace body 1, and the furnace cover 11 opening device is a lock structure for easy manual opening or locking.

[0042] like Figure 1 As shown, a temperature measuring device 8 which is a thermocouple sensor is also installed on the furnace body 1 ; the temperature measuring device 8 extends vertically into the sintering chamber 12 to monitor the temperature in the sintering chamber 12 .

[0043] like Figure 3 、 4 As shown, the monitoring system 4 includes: a light source system 41, an industrial camera 42, and a heat-insulating filter 43; the light source system 41 and the industrial camera 42 are arranged opposite to each other on the furnace body 1 outside the through hole 121, and a heat-insulating filter 43 is arranged between the light source system 41, i.e., the LED lamp and the through hole 121, and the industrial camera 42 and the through hole 121 to improve the data clarity of the image collected by the industrial camera 42, making the imaging clearer.

[0044] like Figure 3 、 4 As shown, a heat preservation table 9 is provided in the sintering chamber 12; a rack 91 for placing sintered blanks is installed on the heat preservation table 9; the rack 91 is at the same horizontal extension as the light source system 41 and the industrial camera 42, which facilitates the industrial camera 42 to accurately collect data.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A high-temperature vacuum visual sintering equipment, characterized in that: include: A furnace body (1); a furnace cover (11) is detachably mounted on the top of the furnace body (1); a sintering chamber (12) for storing blanks is provided in the furnace body (1); a heating element (13) for sintering the blanks into workpieces is provided in the sintering chamber (12); the heating element (13) is made of a long strip of tungsten-molybdenum alloy with a hollow structure; and openings (131) are provided at intervals on the heating element (13); and further comprising: A cooling circulation system (2) includes a cooling component (21) and a heat exchange component (22) for heat exchange with the cooling component (21); the cooling component (21) passes through the furnace body (1) and is connected to the inner cavity of the heating element (13), and is used to cool the heating element (13), the sintering chamber (12), and the workpiece after sintering; A vacuum system (3) is provided on the furnace body (1), and its vacuum interface is connected to the cavity of the furnace body (1), and is used to control the sintering gas pressure and the sintering state of the atmosphere in the furnace; A monitoring system (4); a through hole (121) for the monitoring system (4) to pass through is provided on the side wall of the sintering chamber (12); the monitoring system (4) extends into the furnace body (1) and faces the through hole (121), and its monitoring end and the material placement end of the workpiece placed in the sintering chamber (12) are located on the same horizontal extension line; and is used for real-time monitoring and recording of shape changes of the sintered blank in the sintering chamber (12); A heat-insulating blocking member (5) is movably installed between the cooling assembly (21) and the heating member (13); The cooling assembly (21) comprises: a connecting valve (211) and a through pipe (212); the through pipe (212) is connected to the heating element (13) via the connecting valve (211), and the heat insulating plug (5) is fixed on the connecting valve (211); heat exchange fins (213) with a V-shaped structure are arranged in a unidirectional manner in the through pipe (212); The heat exchange assembly (22) comprises: a heat exchange box (221) and a cooling box (222); the heat exchange box (221) and the cooling box (222) are both filled with cooling liquid; the through pipe (212) is S-shaped and passes through the cooling box (222) and the heat exchange box (221) in sequence; the cooling box (222) and the heat exchange box (221) are both arranged outside the furnace body (1); An automatic inflation device (6) is also installed in the furnace body (1), and a deflation device (7) is installed on the furnace cover (11); a heat exchange tube (71) is inserted into the deflation device (7); the movable end of the heat exchange tube (71) extends into and out of the heat exchange box (221) to the outside of the furnace body (1); The monitoring system (4) comprises: a light source system (41), an industrial camera (42), and a heat-insulating filter (43); the light source system (41) and the industrial camera (42) are arranged on the furnace body (1) outside the through hole (121) opposite to each other, and a heat-insulating filter (43) is arranged between the light source system (41) and the through hole (121), and between the industrial camera (42) and the through hole (121).

2. The high-temperature vacuum visual sintering equipment according to claim 1, characterized in that: A furnace cover opening device (14) is installed between the furnace cover (11) and the furnace body (1).

3. The high-temperature vacuum visual sintering equipment according to claim 1, characterized in that: A temperature measuring device (8) is also installed on the furnace body (1); the temperature measuring device (8) extends vertically into the sintering chamber (12).

4. The high-temperature vacuum visual sintering equipment according to claim 1, characterized in that: A heat preservation platform (9) is provided in the sintering chamber (12); a storage rack (91) is installed on the heat preservation platform (9); the storage rack (91) is located at the same horizontal extension as the light source system (41) and the industrial camera (42).

Images