A debinding system of a vacuum debinding sintering furnace

Abstract

This utility model discloses a degreasing system for a vacuum degreasing sintering furnace, relating to the field of vacuum degreasing sintering furnace technology, including a grease collection box and grease traps. Multiple grease collection boxes are connected in series via conveying pipes, and at least one grease collection box is located directly below the vacuum degreasing sintering furnace. The grease collection box located directly below the vacuum degreasing sintering furnace and adjacent to its bottom is connected to a sealed box inside the vacuum degreasing sintering furnace via a vertically arranged under-furnace degreasing pipe. Multiple grease traps are connected in series via pipes, with one trap at one end connected in series with the grease collection box at the end furthest from the under-furnace degreasing pipe, and the trap at the other end connected to a vacuum pump. The degreasing system for the vacuum degreasing sintering furnace provided by this utility model can avoid clogging of the under-furnace degreasing pipe and reduce the amount of grease vapor entering the vacuum pump.

Description

Technical Field

[0001] This utility model relates to the field of vacuum degreasing sintering furnace technology, and in particular to a degreasing system for a vacuum degreasing sintering furnace. Background Technology

[0002] Existing vacuum degreasing sintering furnaces typically employ a series-connected structure of a collection box and a collector. Inside the furnace is a sealed box containing the binder to be removed. During degreasing, the furnace temperature rises to the binder's decomposition temperature. An opening at the bottom of the sealed box connects to a pipe used for the degreasing system. The collection box and collector are connected in series within this pipe. Under continuous vacuum pump suction, grease vapor flows from the sealed box with inert protective gas into the degreasing pipe below the furnace. Some of the gas in the collector cools and liquefies during flow, flowing into the collection box. The degreasing pipe below the furnace has a downward slope to ensure that the liquid grease collects at the end of the pipe into the collection box. The remaining grease vapor continues to flow towards the pump, passing through the collector before being discharged from the pump exhaust port or entering the pump.

[0003] However, in existing technologies, due to factors such as the small inclination angle of the degreasing pipe under the furnace, liquid grease is easily attached to or blocked inside the degreasing pipe. At room temperature, it may even solidify and block the pipe, preventing the equipment from working properly and affecting the quality of the material. Therefore, the pipe needs to be disassembled and cleaned frequently, which is cumbersome, time-consuming and labor-intensive, and can easily damage the heating wire on the pipe. After the grease vapor flows through the grease collector, trap and pipe, a certain amount of grease vapor is still not liquefied and enters the vacuum pump, increasing the difficulty of cleaning and affecting the service life of the vacuum pump.

[0004] Therefore, there is an urgent need to design a technical solution that can avoid clogging the degreasing pipes under the furnace and reduce the amount of grease vapor entering the vacuum pump. Utility Model Content

[0005] The purpose of this invention is to provide a degreasing system for a vacuum degreasing sintering furnace to solve the problems existing in the prior art, thereby avoiding blockage of the degreasing pipe under the furnace and reducing the amount of grease vapor entering the vacuum pump.

[0006] To achieve the above objectives, this utility model provides the following solution:

[0007] This utility model provides a degreasing system for a vacuum degreasing sintering furnace, comprising:

[0008] The collecting boxes are connected in series via conveying pipes, and at least one of the collecting boxes is located directly below the vacuum degreasing sintering furnace. The collecting box located directly below the vacuum degreasing sintering furnace and adjacent to the bottom of the vacuum degreasing sintering furnace is connected to a sealed box inside the vacuum degreasing sintering furnace via a vertically arranged under-furnace degreasing pipe.

[0009] The traps are connected in series via pipes, with one trap connected in series with a collection box at the end away from the degreasing pipe under the furnace, and the trap at the other end connected to a vacuum pump.

[0010] Preferably, the height of the plurality of traps increases sequentially, with the inlet of the trap at the lowest position connected to the oil collection tank, and the trap at the highest position connected to the vacuum pump.

[0011] Preferably, the resin collection box includes a first resin collection box and a second resin collection box. The first resin collection box is located directly below the vacuum degreasing sintering furnace. The inlet of the first resin collection box is connected to the bottom of the degreasing pipe under the furnace. The outlet of the first resin collection box is connected in series with the inlet of the second resin collection box via a conveying pipe. The collector includes a first collector, a second collector, and a third collector connected in series via pipelines and gradually increasing in height. The first collector and the third collector are both arranged at an angle, and the second collector is arranged vertically. The inlet of the first collector is connected to the outlet of the second resin collection box, and the outlet of the third collector is connected to the vacuum pump. The height of the first collector is greater than the height of the second resin collection box.

[0012] Preferably, the collecting box includes an outer box, and an inner box with a top opening is provided inside the outer box. One end of the outer box has an inlet and outlet, and a box cover is sealed at the inlet and outlet. After the box cover is opened, the inner box can enter and exit through the box cover. The top of the outer box has an inlet connection pipe and an outlet connection pipe. The inlet connection pipe and the outlet connection pipe are used to connect in series with the collecting box or the collector. The collecting box located near the vacuum degreasing sintering furnace is connected to the bottom of the furnace degreasing pipe through the inlet connection pipe, and the collecting box located away from the vacuum degreasing sintering furnace is connected to the collector through the outlet connection pipe.

[0013] Preferably, the bottom of the first oil collection box is provided with a support, and the height of the support is adjustable.

[0014] Preferably, the trap includes an inclined trap pipe, one end of which is connected to a trap inlet pipe and the other end of which is connected to a trap outlet pipe, the height of which is greater than the height of which is ...

[0015] Preferably, the trapping device includes a trapping tube with multiple trapping fins. A cover plate is fixedly installed on the outer wall of one end of the trapping tube. One end of the trapping pipe has an opening. The end of the trapping tube located inside the cover plate extends into the trapping pipe through the opening. The cover plate can be fixedly sealed with the opening of the trapping pipe. The end of the trapping tube located outside the cover plate has an inlet and an outlet. The inlet and outlet are respectively connected to external cooling devices through pipelines.

[0016] Preferably, the outer wall of the trap pipe is wrapped with insulating cotton.

[0017] Preferably, the lower end of the third collector is detachably connected to a fat collection tank.

[0018] Preferably, one end of the lid is hinged to the outer box via a connecting mechanism, and the other end is provided with a clamping mechanism. After the lid and the outer box are sealed together, the clamping mechanism can fix the lid and the outer box.

[0019] The present invention achieves the following technical advantages over the prior art:

[0020] This invention features at least one grease collection box directly below the vacuum degreasing sintering furnace. The degreasing pipe under the furnace is changed from a slightly inclined arrangement in the prior art to a vertical arrangement, thereby reducing the length of the degreasing pipe and increasing the inclination. The degreasing pipe under the furnace, which connects to the bottom of the sealed box of the vacuum degreasing sintering furnace, can be vertically inserted into the grease collection box from the top side. This reduces the deposition of liquid grease in the degreasing pipe due to its bending, inclination, and small angle, preventing blockage and wax return. The grease collection box has an inner box for collecting liquid grease. Multiple traps are connected in series between the grease collection box and the vacuum pump. Through the coordinated action of multiple traps, the collection efficiency of grease vapor is increased, reducing the amount of grease vapor entering the vacuum pump. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the degreasing system structure of a vacuum degreasing sintering furnace in one or more embodiments of the present invention.

[0023] Figure 2This is a schematic diagram of the third collector structure of the degreasing system of the vacuum degreasing sintering furnace in one or more embodiments of the present invention.

[0024] Figure 3 This is a schematic diagram of the degreasing box structure of the degreasing system of the vacuum degreasing sintering furnace in one or more embodiments of the present invention.

[0025] In the diagram: 1-Vacuum degreasing sintering furnace, 2-Sealed box, 3-First grease collection box, 4-Second grease collection box, 5-First trap, 6-Second trap, 7-Third trap, 8-Vacuum pump, 9-Degreasing pipe under furnace, 10-Grease vapor, 11-Liquid grease, 12-Grease collection tank, 13-Trapper pipe, 14-Trapper fins, 15-Inlet, 16-Outlet, 17-Trapper outlet pipe, 18-Trapper inlet pipe, 19-Insulation cotton, 20-Heating wire, 21-Clamping mechanism, 22-Outer box, 23-Inner box, 24-Support, 25-Box cover, 26-Cover plate, 27-Inlet connection pipe, 28-Outlet connection pipe, 29-Sealing mechanism, 30-Connecting mechanism. Detailed Implementation

[0026] 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.

[0027] The purpose of this invention is to provide a degreasing system for a vacuum degreasing sintering furnace to solve the problems existing in the prior art, thereby avoiding blockage of the degreasing pipe under the furnace and reducing the amount of grease vapor entering the vacuum pump.

[0028] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] In existing technologies, due to factors such as the small inclination angle of the degreasing pipe under the furnace, liquid grease easily adheres to or clogs the pipe, and may even solidify and block it at room temperature, preventing the equipment from working properly and affecting the quality of the materials. Therefore, the pipe needs to be frequently disassembled for cleaning, which is cumbersome, time-consuming, and labor-intensive, and can easily damage the heating wires on the pipe. After flowing through the grease collector, trap, and pipe, a certain amount of grease vapor remains unliquefied and enters the vacuum pump, increasing the difficulty of cleaning and affecting the service life of the vacuum pump. To solve this technical problem, this utility model provides a degreasing system for a vacuum degreasing sintering furnace, referencing... Figure 1 , Figure 2 and Figure 3 As shown, the system includes a collection box and a collector. Multiple collection boxes are connected in series via conveying pipes, and at least one collection box is located directly below the vacuum degreasing sintering furnace 1. The collection box located directly below the vacuum degreasing sintering furnace 1 and adjacent to the bottom of the vacuum degreasing sintering furnace 1 is connected to the sealed box 2 inside the vacuum degreasing sintering furnace 1 via a vertically arranged under-furnace degreasing pipe 9. Multiple collectors are connected in series via pipes, and the inlet of the collector at one end is connected in series with the collection box at the end away from the under-furnace degreasing pipe 9. The collector at the other end is connected to a vacuum pump 8.

[0030] The vacuum degreasing sintering furnace 1 is a structure found in the prior art. Inside, a sealed box 2, also of the prior art, is placed. The sealed box 2 is used to load materials containing the binder to be removed. During the degreasing process, the furnace temperature rises to the decomposition temperature of the binder. A vacuum pump 8 continuously draws air to create negative pressure, while protective gases such as nitrogen are introduced. The pressure difference between the inside and outside of the sealed box 2 drives the gas to flow unidirectionally, causing the gaseous binder to diffuse and permeate through the pores of the parts and be discharged. The bottom of the sealed box 2 has an opening connecting to a degreasing pipe 9 under the furnace. Under the continuous suction of the vacuum pump 8, grease vapor 10 flows from the sealed box 2 into the degreasing pipe 9 under the furnace along with the inert protective gas, and then into the grease collection box. Liquid grease 11 is retained in the grease collection box. The remaining gaseous grease vapor 10 enters a collector. Some of the gas in the collector cools and liquefies during flow, flowing back into the grease collection box through a pipe. The remaining grease vapor 10 continues to flow towards the pump end, passing through the collector for collection. Finally, the remaining inert protective gas is discharged from the pump exhaust port. This invention provides at least one grease collection box directly below the vacuum degreasing sintering furnace 1. The degreasing pipe 9 under the furnace is changed from a slightly inclined arrangement in the prior art to a vertical arrangement, thereby reducing the length of the pipe 9 and increasing its inclination. The degreasing pipe 9, connected to the bottom of the sealed box 2 of the vacuum degreasing sintering furnace 1, can vertically enter the grease collection box from the top side. This reduces the deposition of liquid grease 11 in the degreasing pipe 9 due to its bending, inclination, and small angle, preventing blockage and thus preventing wax return. The grease collection box contains an inner box 23 for collecting liquid grease 11. Multiple traps are connected in series between the grease collection box and the vacuum pump 8. The height of the traps increases sequentially, and the inlet of the trap at the lowest position is connected to the grease collection box, while the trap at the highest position is connected to the vacuum pump 8. This allows the pre-cooled and liquefied liquid grease 11 in the traps to flow downwards under the action of gravity and enter the grease collection box through the pipe. Through the coordinated action of multiple traps, the collection efficiency of grease vapor 10 is increased, which can reduce the amount of grease vapor 10 entering the vacuum pump 8.

[0031] In one embodiment, the grease collection box includes a first grease collection box 3 and a second grease collection box 4. The first grease collection box 3 is located directly below the vacuum degreasing sintering furnace 1. The inlet of the first grease collection box 3 is connected to the bottom of the degreasing pipe 9 under the furnace. The outlet of the first grease collection box 3 is connected to the inlet of the second grease collection box 4 in series through a conveying pipe. The traps include a first trap 5, a second trap 6 and a third trap 7 connected in series through pipes and gradually increasing in height. The first trap 5 and the third trap 7 are both arranged at an angle. The second trap 6 is arranged vertically. The inlet of the first trap 5 is connected to the outlet of the second grease collection box 4. The outlet of the third trap 7 is connected to the vacuum pump 8. The height of the first trap 5 is greater than the height of the second grease collection box 4. The pipe connecting the traps and the grease collection box serves as both a pipe for grease vapor 10 to flow to the vacuum pump 8 and a flow channel for condensed liquid grease 11 to flow in the reverse direction to the grease collection box below. In this embodiment, the first collection tank 3 is provided with a support 24 at its bottom. The height of the support 24 is adjustable. The bottom of the support 24 contacts the ground through adjustable-height legs, providing upward support for the primary collection tank. The support 24 can be adjusted according to the flatness of the ground and the height of the primary collection tank from the ground, so that the primary collection tank is placed horizontally and its stability is guaranteed.

[0032] In one embodiment, the collection box includes an outer box 22, and an inner box 23 with a top opening inside the outer box 22. One end of the outer box 22 has an inlet and outlet, and a box cover 25 is sealed at the inlet and outlet. The inner side of the box cover 25 is provided with a sealing mechanism 29 such as a sealing gasket, so that the box cover 25 can achieve a sealing function when it is fastened to the inlet and outlet. One end of the box cover 25 is hinged to the outer box 22 through a connecting mechanism 30. The connecting mechanism 30 can be a hinge or a rotating rod. The hinge connects the box cover 25 to one end of the outer box 22, or two rotating rods connected rotatably connect the box cover 25 to one end of the outer box 22. The other end of the box cover 25 is provided with a clamping mechanism 21. After the box cover 25 is sealed and connected to the outer box 22, the clamping mechanism 21 can fix the box cover 25 to the outer box 22. The clamping mechanism 21 can be a lock or an electronic lock, etc., to achieve the locking function of the box cover 25 and the outer box 22. After the lid 25 is opened, the inner box 23 can be accessed through the lid 25. The inner box 23 is similar to a drawer-type structure, and its outer side is provided with a handle, which makes it easy to pull the inner box 23 out of the outer box 22. The top of the outer box 22 is provided with an inlet connection pipe 27 and an outlet connection pipe 28. The inlet connection pipe 27 and the outlet connection pipe 28 are used to connect multiple oil collection boxes or traps in series. The oil collection box located near the vacuum degreasing sintering furnace 1 is connected to the bottom of the furnace degreasing pipe 9 through the inlet connection pipe 27, and the oil collection box located away from the vacuum degreasing sintering furnace 1 is connected to the trap through the outlet connection pipe 28. Liquid grease 11 flows directly into the inner chamber 23 of the primary grease collection tank. Residual grease vapor 10 flows out from the outlet with the protective gas and enters the secondary grease collection tank through a pipe. This pipe is inclined at a certain angle to the secondary grease collection tank. This angle is not limited and the inclination can be changed by changing the bend. In this way, the liquid grease 11 that has cooled and liquefied in the pipe will enter the secondary grease collection tank through the pipe, which is convenient for centralized cleaning. The inner chamber 23 is used to collect liquid grease 11. When cleaning, you only need to open the cover 25 and pull out the inner chamber 23. The cleaning is quick, easy and can improve production efficiency.

[0033] In one embodiment, the trap includes an inclined trap pipe 13, one end of which is connected to a trap inlet pipe 18, and the other end of which is connected to a trap outlet pipe 17. The height of the trap outlet pipe 17 is greater than the height of the trap inlet pipe 18. A heating wire 20 is wound around the outer wall of the trap pipe 13. In this embodiment, the heating wire 20 is an electric heating wire connected to a power source. Alternatively, the heating wire 20 can be replaced with an electric heating plate attached to the outer wall of the trap pipe 13. A trapping device is provided inside the trap pipe 13. The trapping device in this embodiment includes a trapping tube with multiple trapping fins 14. A cover plate 26 is fixedly installed on the outer wall of one end of the trapping tube. One end of the trapping pipe 13 has an opening. The end of the trapping tube located inside the cover plate 26 extends into the trapping pipe 13 through the opening, and the cover plate 26 can be fixedly sealed with the opening of the trapping pipe 13. The end of the trapping tube located outside the cover plate 26 has an inlet 15 and an outlet 16. The inlet 15 and the outlet 16 are respectively connected to external cooling devices through pipelines. In this embodiment, the trapping fins 14 are metal fins, which can be designed with an internal hollow structure. The metal fins are connected to the inside of the trapping tube. Circulating cooling water is continuously introduced through the trapping tube to cool the metal fins and improve the capture rate. The collector is placed at an angle, so when the grease vapor 10 comes into contact with the metal fins and cools down to become liquid, it flows back into the grease collection box through the collector inlet pipe 18. Cleaning is done by simply opening the collection box. The collector outlet pipe 17 is connected to a vacuum pump 8. A heating wire 20 is wound around the outside of the collector pipe 13, heating the collector pipe 13 during degreasing to prevent liquid grease 11 from solidifying on the inner wall of the pipe and clogging the pipe. Since some of the grease vapor 10 condenses into solid grease upon cooling and adheres to the metal fins, the metal fins can be pulled out for cleaning using the cover plate 26. The cover plate 26 is equipped with a locking or snap-locking clamping mechanism 21 installed on the collector pipe 13; opening the clamping mechanism 21 allows the metal fins to be pulled out. Cooling water is continuously supplied to the metal fins during degreasing. The cooling water enters from the inlet 15, flows through the metal fins, and exits from the outlet 16, keeping the metal fins at a low temperature. The grease vapor 10 liquefies upon contact with the low-temperature metal fins.

[0034] In this embodiment, the three collectors gradually increase in height. The pipes connecting the first collector 5 and the second collector 6 are placed vertically or at an angle. Therefore, the grease vapor 10 in the first collector 5 and the second collector 6 turns into liquid upon cooling and flows in the opposite direction through the pipe above the grease collection tank. The pipe has a large inner diameter, and under the action of gravity, the liquid grease flows in the opposite direction in the lower part of the pipe, while the grease vapor flows in the forward direction in the upper part of the pipe, which is towards the vacuum pump. The grease vapor and liquid grease in the pipe will form two layers, which will not interfere with each other's flow process. The liquid grease flows back into the grease collection tank, which can be opened for cleaning. A grease collection tank 12 is provided at the lower end of the third collector 7. The liquid grease 11 in the third collector 7 will flow into the grease collection tank 12. The grease collection tank 12 has a portable disassembly structure, which can be opened for cleaning.

[0035] In one embodiment, the trapping fins 14 in the three traps are made of materials such as stainless steel, aluminum, or copper, depending on parameters such as thermal conductivity. Metal wool can also be used instead of trapping fins 14 to capture the adhesive. The airflow trajectory can be altered by bending or changing the diameter of the trapping fins 14, thereby improving the capture rate. In this embodiment, insulation cotton 19 is wrapped around the outside of the trap pipe 13, and the heating wire 20 is located inside the insulation cotton 19. The insulation properties of the insulation cotton 19 prevent the heat generated by the heating wire 20 from dissipating quickly, thus avoiding the liquid grease 11 solidifying on the inner wall of the grease collector pipe upon cooling and causing blockage.

[0036] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A debinding system of a vacuum debinding sintering furnace, characterized by: include: The collecting boxes are connected in series via conveying pipes, and at least one of the collecting boxes is located directly below the vacuum degreasing sintering furnace. The collecting box located directly below the vacuum degreasing sintering furnace and adjacent to the bottom of the vacuum degreasing sintering furnace is connected to a sealed box inside the vacuum degreasing sintering furnace via a vertically arranged under-furnace degreasing pipe. The traps are connected in series via pipes, with one trap connected in series with a collection box at the end away from the degreasing pipe under the furnace, and the trap at the other end connected to a vacuum pump.

2. The debinding system of the vacuum debinding sintering furnace according to claim 1, characterized in that: The height of the multiple traps increases sequentially, with the inlet of the trap at the lowest position connected to the oil collection tank, and the trap at the highest position connected to the vacuum pump.

3. The debinding system of the vacuum debinding sintering furnace according to claim 1, characterized in that: The collecting tank includes a first collecting tank and a second collecting tank. The first collecting tank is located directly below the vacuum degreasing sintering furnace. The inlet of the first collecting tank is connected to the bottom of the degreasing pipe under the furnace. The outlet of the first collecting tank is connected in series with the inlet of the second collecting tank through a conveying pipe. The trap includes a first trap, a second trap, and a third trap connected in series through pipelines and gradually increasing in height. The first trap and the third trap are both arranged at an angle, and the second trap is arranged vertically. The inlet of the first trap is connected to the outlet of the second collecting tank, and the outlet of the third trap is connected to the vacuum pump. The height of the first trap is greater than the height of the second collecting tank.

4. The debinding system of the vacuum debinding sintering furnace according to claim 1, characterized in that: The collecting box includes an outer box, inside which is an inner box with an open top. One end of the outer box has an inlet and outlet, and a sealed lid is provided at the inlet and outlet. When the lid is opened, the inner box can enter and exit through the lid. The top of the outer box has an inlet connection pipe and an outlet connection pipe, which are used to connect in series with the collecting box or the collector. The collecting box located near the vacuum degreasing sintering furnace is connected to the bottom of the furnace degreasing pipe through the inlet connection pipe, and the collecting box located away from the vacuum degreasing sintering furnace is connected to the collector through the outlet connection pipe.

5. The debinding system of the vacuum debinding sintering furnace according to claim 3, characterized in that: The first fat collection box is equipped with a support at the bottom, and the height of the support is adjustable.

6. The debinding system of the vacuum debinding sintering furnace according to claim 1, characterized in that: The trap includes an inclined trap pipe, one end of which is connected to a trap inlet pipe and the other end of which is connected to a trap outlet pipe. The height of the trap outlet pipe is greater than the height of the trap inlet pipe. A heating wire is wound around the outer wall of the trap pipe, and a trapping device is provided inside the trap pipe.

7. The degreasing system of the vacuum degreasing sintering furnace according to claim 6, characterized in that: The trapping device includes a trapping tube with multiple trapping fins. A cover plate is fixedly installed on the outer wall of one end of the trapping tube. One end of the trapping pipe has an opening. The end of the trapping tube located inside the cover plate extends into the trapping pipe through the opening. The cover plate can be fixedly sealed with the opening of the trapping pipe. The end of the trapping tube located outside the cover plate has an inlet and an outlet. The inlet and outlet are respectively connected to external cooling devices through pipelines.

8. The degreasing system of the vacuum degreasing sintering furnace according to claim 6, characterized in that: The outer wall of the trap pipe is wrapped with insulating cotton.

9. The degreasing system of the vacuum degreasing sintering furnace according to claim 3, characterized in that: The lower end of the third trap is detachably connected to a fat collection tank.

10. The degreasing system of the vacuum degreasing sintering furnace according to claim 4, characterized in that: One end of the lid is hinged to the outer box via a connecting mechanism, and the other end is provided with a clamping mechanism. After the lid and the outer box are sealed together, the clamping mechanism can fix the lid and the outer box.

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