Acid feeding structure of degreasing furnace

Abstract

The invention relates to the technical field of degreasing furnace acid feeding, in particular to a degreasing furnace acid feeding structure which comprises a material storage box, a weighing mechanism is connected to the material storage box, a hose is connected to a discharging port of the material storage box, the discharging port of the material storage box communicates with a conveying mechanism through the hose, and the conveying mechanism is installed on a degreasing furnace. The conveying mechanism is communicated with the degreasing furnace through the gasification device. The weighing mechanism and the hose are arranged, the two ends of the hose are connected with the discharging port of the material storage box and the feeding port of the conveying mechanism correspondingly, and by means of the deformable characteristic of the hose, the hose plays a communication role, meanwhile, rigid support between the material storage box and the hose can be eliminated, and the conveying efficiency is improved. According to the technical scheme, the gravity of the material storage box almost acts on the weighing mechanism, the weighing accuracy of the weighing mechanism is improved, hard impact force between the material storage box and the hose caused by vibration generated during working can be prevented, and the problem that oxalic acid leaks due to the fact that the connecting position of the material storage box and the hose is damaged and broken is solved.

Description

Technical Field

[0001] This invention relates to the field of acid inlet technology for degreasing furnaces, and more particularly to an acid inlet structure for degreasing furnaces. Background Technology

[0002] In metal powder injection molding technology, after the mixed materials are injection molded to obtain a preform, most of the binder in the preform needs to be removed before sintering. This process is called debinding. Catalytic debinding is a commonly used process. It usually involves placing the preform in a dedicated debinding furnace, heating the furnace, and continuously introducing a preheated protective gas (such as nitrogen) into the furnace to replace the air. Then, a catalytic material is introduced into the furnace, causing the binder in the preform to undergo catalytic decomposition at a set temperature, thereby achieving the removal of the binder.

[0003] Oxalic acid, a common catalyst for catalytic degreasing, requires sublimation into a gaseous state upon heating to participate in the catalytic reaction. However, oxalic acid powder is prone to hygroscopic agglomeration and crystallization, making stable and uniform feeding difficult. Currently, acid feeding systems for catalytic degreasing typically integrate three functional modules: stirring, metering feed, and gasification, corresponding to stirring devices, acid feeding devices, and gasification devices. However, when these devices are connected to the feed tank, they may support the tank, leading to inaccurate measurement of the tank's weight and affecting the required accuracy of metering feed. Summary of the Invention

[0004] In order to overcome the shortcomings mentioned in the background art, this application provides a degreasing furnace acid inlet structure.

[0005] A degreasing furnace acid inlet structure includes a storage bin, a weighing mechanism for weighing the storage bin is connected to the storage bin, a flexible hose is connected to the outlet of the storage bin, the outlet of the storage bin is connected to a conveying mechanism for conveying oxalic acid through the flexible hose, the conveying mechanism is installed on the degreasing furnace, and the conveying mechanism is connected to the degreasing furnace through a gasification device for gasifying oxalic acid.

[0006] As one embodiment, the weighing mechanism includes a mounting bracket that can be installed on a degreasing furnace and a weighing sensor for weighing the storage bin. The weighing sensor is installed on the side of the mounting bracket near the storage bin, and the sensing end of the weighing sensor is fixedly connected to the storage bin.

[0007] In one embodiment, the weighing sensors are symmetrically arranged on both sides of the storage bin.

[0008] As one embodiment, the hose is provided with a deformable portion that protrudes outward in the circumferential direction, and the flow area of ​​the deformable portion is larger than the flow area of ​​the rest of the hose.

[0009] In one embodiment, the conveying mechanism includes a screw conveyor, the inlet of the conveying pipe on the screw conveyor is connected to the outlet of the storage box through the hose, and the outlet of the conveying pipe is connected to the gasification device.

[0010] In one embodiment, the gasification device includes a connecting pipe and a gasification pipeline. The inlet of the connecting pipe is connected to the outlet of the conveying mechanism, and the outlet of the connecting pipe is connected to the inlet of the gasification pipeline. A heating wire for heating the internal oxalic acid is provided on the outside of the gasification pipeline. An acid inlet pipeline for connecting to a degreasing furnace is provided at the outlet of the gasification pipeline. An inlet port for supplying nitrogen gas into the gasification pipeline is provided on the gasification pipeline.

[0011] As one embodiment, the axis of the gasification pipeline is parallel to the horizontal plane, and the air inlet port is close to the outlet of the connecting pipe.

[0012] As one embodiment, a thermocouple for detecting the internal temperature is installed on the vaporization pipeline.

[0013] As one embodiment, both the connecting pipe and the gasification pipe are provided with inspection ports for maintenance.

[0014] As one embodiment, the storage tank is provided with a stirring mechanism for stirring oxalic acid to prevent oxalic acid crystallization. The stirring mechanism includes a stirring element, which is rotatably connected to the storage tank. A stirring motor is installed outside the storage tank, and the output shaft of the stirring motor is fixedly connected to the stirring element.

[0015] The beneficial effects of this application are: This invention incorporates a weighing mechanism and a flexible hose. The two ends of the hose are connected to the outlet of the storage bin and the inlet of the conveying mechanism, respectively. Utilizing the deformable nature of the hose, it serves a connecting function while eliminating the rigid support between the storage bin and the hose. This not only ensures that almost all the weight of the storage bin is applied to the weighing mechanism, improving its accuracy, but also prevents vibrations during operation from causing hard impacts between the storage bin and the hose, thus avoiding oxalic acid leakage due to damage or breakage at the connection point.

[0016] Other technical solutions of the present invention can also achieve the following technical effects: By setting a circumferentially outwardly protruding deformation part on the hose, when the hose is squeezed in the axial direction, the deformation part can deform outward in a circumferential direction. This avoids the deformation of the deformation part causing a reduction in the internal flow area, which would reduce the discharge speed of the material outlet of the storage box and thus affect the discharge efficiency. At the same time, it can also reduce the risk of blockage.

[0017] By aligning the axis of the gasification pipeline with the horizontal plane and placing the inlet port close to the outlet of the connecting pipe, nitrogen gas can blow away the accumulated oxalic acid powder when the inlet port is opened. This allows the accumulated oxalic acid powder to gradually spread out in the gasification pipeline, increasing the contact area between the oxalic acid powder and the nitrogen gas and the inner wall of the gasification pipeline, thereby improving the gasification efficiency of oxalic acid. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the acid inlet structure of the degreasing furnace in an embodiment of the present invention; Figure 2 This is a schematic diagram showing the positional relationship of the mounting bracket and weighing sensor, among other components, in an embodiment of the present invention. Figure 3 This is a schematic diagram showing the positional relationship between the hose and the delivery pipe in an embodiment of the present invention; Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle; Figure 5 This is a schematic diagram showing the positional relationship between the storage bin and the weighing sensor in an embodiment of the present invention; Figure 6 This is a three-dimensional structural diagram of the stirring component in an embodiment of the present invention.

[0019] In the attached diagram, the following are the reference numerals: 1. Storage bin; 2. Weighing mechanism; 201. Mounting bracket; 202. Weighing sensor; 3. Hoses; 4. Conveying mechanism; 401. Conveying pipe; 5. Gasification device; 501. Connecting pipe; 502. Gasification pipeline; 503. Acid inlet pipeline; 504. Air inlet port; 505. Thermocouple; 506. Inspection port; 6. Stirring mechanism; 601. Stirring motor; 602. Rotating shaft; 603. Connecting rod; 604. Stirring rod. Detailed Implementation

[0020] To make the above-mentioned objectives, features, and advantages of the present invention more apparent and understandable, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] A degreasing furnace acid inlet structure, such as Figure 1 and Figure 2As shown, the system includes a storage bin 1 with a transparent observation window on top for easy monitoring of its interior. A feed inlet is also located on the top of the storage bin 1, allowing operators to add oxalic acid powder by opening a valve. A guide surface at the bottom of the storage bin 1 directs the oxalic acid towards the discharge outlet. A weighing mechanism 2 is connected to the storage bin 1 to weigh the contents and determine the amount of oxalic acid, facilitating quantitative processing and precise control of oxalic acid usage. The discharge outlet of the storage bin 1 is connected to a conveying mechanism 4, which can be installed on a degreasing furnace or on the ground. The discharge outlet of the storage bin 1 is connected to the feed inlet of the conveying mechanism 4 via a flexible hose 3. A solenoid valve can be installed at the discharge outlet of the storage bin 1. When oxalic acid is being added to the storage bin 1, the solenoid valve is closed, ensuring all the oxalic acid remains within the storage bin 1 and prevents it from entering the flexible hose 3. By utilizing the deformable nature of the hose 3, rigid support is avoided between the storage tank 1 and the hose 3. This not only allows almost all the weight of the storage tank 1 to be applied to the weighing mechanism 2, improving the weighing accuracy of the weighing mechanism 2 and meeting the precision requirements of metering and feeding, but also prevents damage to the connection between the storage tank 1 and the hose 3 caused by the addition of oxalic acid or vibrations generated during the operation of the device. This avoids the problem of oxalic acid leakage due to damage or breakage at the connection between the storage tank 1 and the hose 3. Furthermore, the hose 3 still maintains its connecting function even after deformation. The conveying mechanism 4 is connected to the degreasing furnace through the gasification device 5. When oxalic acid needs to be processed, the operator opens the solenoid valve and the conveying mechanism 4. The oxalic acid in the storage tank 1 passes through the solenoid valve and the hose 3 and falls into the conveying mechanism 4. During this process, the conveying mechanism 4 continuously supplies oxalic acid to the gasification device 5, preventing oxalic acid from accumulating in the hose 3. When the weight displayed by the weighing mechanism 2 reaches the specified weight, the solenoid valve is closed, and the conveying mechanism 4 stops working after conveying all the oxalic acid inside to the gasification device 5, thus achieving quantitative processing of oxalic acid. Operators can freely select the amount of oxalic acid processed, suitable for different work needs. The gasification device 5 heats the oxalic acid inside, causing the oxalic acid powder to vaporize into oxalic acid gas. The resulting oxalic acid gas is then ultimately transported to the degreasing furnace for utilization.

[0022] In one embodiment, such as Figure 2As shown, the weighing mechanism 2 includes a mounting frame 201 and a weighing sensor 202. The mounting frame 201 can be installed on the degreasing furnace or on the ground. The weighing sensor 202 is installed on the top of the mounting frame 201. The storage bin 1 is fixed to the sensing end of the weighing sensor 202. The weight of the storage bin 1 acts on the weighing sensor 202, enabling the weighing sensor 202 to weigh the storage bin 1. Before filling with oxalic acid, the operator can measure the net weight of the storage bin 1 using the weighing sensor 202. Then, based on the weight displayed by the weighing sensor 202 after filling with oxalic acid, the weight of the oxalic acid inside the storage bin 1 can be calculated. The weight of the acid: After adding oxalic acid to the storage tank 1, the overall weight of the storage tank 1 increases, causing the storage tank 1 to press down on the weighing sensor 202. The sensing end of the weighing sensor 202 moves downward a certain distance, causing the storage tank 1 to move downward. At this time, the hose 3 deforms under the pressure of the storage tank 1. While deforming, the hose 3 can still ensure the connection between the storage tank 1 and the conveying mechanism 4. Since the rebound force of the hose 3 is relatively small, the hose 3 will hardly affect the weighing accuracy of the weighing sensor 202. The weighing error caused by the rebound force of the hose 3 is within the acceptable range of the weighing sensor 202. After the solenoid valve and conveying mechanism 4 are turned on, the reading displayed by the weighing sensor 202 gradually decreases as the conveying mechanism 4 conveys oxalic acid. The operator can turn off the solenoid valve when the reading of the weighing sensor 202 is within a specified value or range. After the conveying mechanism 4 has conveyed all the oxalic acid in it to the gasification device 5, the conveying mechanism 4 is turned off. This allows the operator to freely control the amount of oxalic acid processed according to the needs of the degreasing furnace, thereby achieving quantitative processing of oxalic acid and meeting different usage requirements.

[0023] In one embodiment, such as Figure 1 and Figure 2 As shown, at least one weighing sensor 202 is provided on each of the two opposite sides of the storage bin 1. All the weighing sensors 202 can be set on the same horizontal plane or on different planes. Multiple weighing sensors 202 can not only share the weight of the storage bin 1 and increase the upper limit of weighing, but also make the weighing sensors 202 more evenly subjected to the squeezing force of the storage bin 1. This avoids the problem of uneven force caused by setting weighing sensors 202 on only one side, which ultimately reduces the weighing accuracy and affects the service life of the parts.

[0024] In one embodiment, such as Figure 3 and Figure 4As shown, the hose 3 is provided with a deformable part that protrudes outward in a circumferential direction. The deformable part can be cylindrical, spherical, or elliptical. The axis of the hose 3 is perpendicular to the horizontal plane. Except for the deformable part, the hose 3 can be straight. Multiple hoses 3 can be provided. Correspondingly, the discharge port of the storage box 1 and the inlet of the conveying mechanism 4 are also provided with multiple hoses 3 in the same number. The axis of the hose 3 coincides with the axis of the corresponding discharge port of the storage box 1 and the axis of the corresponding inlet of the conveying mechanism 4. The flow area inside the deformable part is larger than the flow area of ​​the other parts of the hose 3. When the storage box 1 squeezes the hose 3 downward, the deformable part of the hose 3 deforms outward in a circumferential direction, so as not to affect the discharge speed of the storage box 1 and reduce the risk of blockage.

[0025] In one embodiment, such as Figure 3 As shown, the conveying mechanism 4 includes a screw conveyor, which includes a conveying pipe 401, an auger shaft, and a drive motor. The auger shaft is rotatably installed inside the conveying pipe 401. The drive motor can be installed on the degreasing furnace or fixed to the ground by a frame. The output shaft of the drive motor is fixedly connected to the auger shaft. The top of the conveying pipe 401 is provided with a feed inlet. The axis of the feed inlet of the conveying pipe 401, the axis of the hose 3, and the axis of the discharge outlet of the storage box 1 are parallel to each other. The feed inlet of the conveying pipe 401 is connected to the discharge outlet of the storage box 1 through the hose 3. The discharge outlet of the conveying pipe 401 is connected to the feed inlet of the gasification device 5. After the conveying mechanism 4 is started, the output shaft of the drive motor drives the auger shaft to rotate, causing the auger shaft to push the oxalic acid in the conveying pipe 401 toward the gasification device 5, thereby realizing the conveying of oxalic acid.

[0026] In one embodiment, such as Figure 1 and Figure 2As shown, the gasification device 5 includes a connecting pipe 501 and a gasification pipeline 502. The inlet of the connecting pipe 501 is connected to the outlet of the conveying pipe 401. The outlet of the connecting pipe 501 is located below its inlet, so that oxalic acid can move downward along the connecting pipe 501 after entering it. The outlet of the connecting pipe 501 is connected to the inlet of the gasification pipeline 502, so that oxalic acid can enter the gasification pipeline 502 through the connecting pipe 501. A section of the connecting pipe 501 in the middle can be a detachable flexible section. After the flexible section is removed, the connecting pipe 501 can be divided into two short pipes, upper and lower. After the flexible section is removed, the inside of the connecting pipe 501 can be observed from the removal position of the flexible section, making it easier for the staff to inspect the inside of the connecting pipe 501. A heating wire is installed on the outside of the vaporization pipe 502, and an insulation layer is installed on the outside of the heating wire to reduce heat loss and improve heating efficiency. When the heating wire is turned on, it can heat the oxalic acid inside the vaporization pipe 502, causing the oxalic acid powder to vaporize into oxalic acid gas. The outlet of the vaporization pipe 502 is provided with an acid inlet pipe 503 for connecting to the degreasing furnace. An air inlet port 504 is provided on the vaporization pipe 502. The axis of the air inlet port 504 can be perpendicular to the axis of the vaporization pipe 502 or inclined. When inclined, the air outlet of the air inlet port 504 is inclined towards the air inlet of the acid inlet pipe 503. The air outlet of the air inlet port 504 is located in the upper part of the acid inlet pipe 503, which can prevent oxalic acid powder from falling into the air inlet port 504. The inlet port 504 can deliver heated nitrogen into the vaporization pipeline 502. The heated nitrogen can also help oxalic acid vaporize, thereby improving the oxalic acid vaporization efficiency. Moreover, after the acid inlet of the degreasing furnace is opened, the continued introduction of nitrogen can also guide the oxalic acid gas into the degreasing furnace, which can shorten the time for the oxalic acid gas to enter the degreasing furnace and improve the acid inlet efficiency.

[0027] In one embodiment, the axis of the vaporization pipeline 502 is parallel to the horizontal plane, so that the oxalic acid powder accumulates at the inlet of the vaporization pipeline 502 after passing through the connecting pipe 501. The air inlet port 504 is close to the outlet of the connecting pipe 501, so that when the air inlet port 504 is opened, nitrogen can blow the accumulated oxalic acid powder, causing the accumulated oxalic acid powder to gradually spread in the vaporization pipeline 502. This can increase the contact area between the oxalic acid powder and the nitrogen and the heated inner wall of the vaporization pipeline 502, thereby improving the vaporization efficiency of oxalic acid.

[0028] In one embodiment, such as Figure 1 and Figure 2 As shown, a thermocouple 505 is installed on the vaporization pipeline 502. The thermocouple 505 is used to detect the gas temperature inside the vaporization pipeline 502. The staff can judge the internal heating status based on the temperature detected by the thermocouple 505, which makes it convenient for the staff to adjust the internal temperature as needed.

[0029] In one embodiment, such as Figure 1 and Figure 2 As shown, both the connecting pipe 501 and the vaporization pipe 502 are equipped with inspection ports 506 for maintenance. The inspection port 506 of the connecting pipe 501 is located at the upper end, while the inspection port 506 of the vaporization pipe 502 is located at the end near the air inlet port 504. Workers can open the inspection ports 506 to clean or inspect the interior of the connecting pipe 501 and the vaporization pipe 502. Because the connecting pipe 501 has a certain height, it is difficult for workers to observe deeper parts of the pipe through the inspection port 506. Therefore, during maintenance, workers can first remove the flexible section of the connecting pipe 501, dividing it into two short pipes, making it easier for workers to observe the interior of the connecting pipe 501 from the removed flexible section, thus facilitating a clearer inspection of its interior.

[0030] In one embodiment, such as Figure 5 and Figure 6 As shown, a stirring mechanism 6 for stirring oxalic acid to prevent crystallization is provided inside the storage tank 1. The stirring mechanism 6 includes a stirring component. A stirring motor 601 is installed outside the storage tank 1. The output shaft of the stirring motor 601 passes through the storage tank 1 and is fixedly connected to the rotating shaft 602. The stirring component is rotatably connected to the storage tank 1. The stirring component may include the rotating shaft 602, a connecting rod 603, and a stirring rod 604. The rotating shaft is rotatably connected inside the storage tank 1. Multiple connecting rods 603 and stirring rods 604 are provided. The connecting rods 603 and stirring rods 604 are equidistantly distributed around the axis of the rotating shaft 602. 4. The stirring rod 604 is installed on the rotating shaft 602 via the corresponding connecting rod 603. The stirring rod 604 is parallel to the axis of the rotating shaft 602. The bottom of the storage box 1 is arc-shaped. The maximum diameter of the movement path of the stirring rod 604 matches the inner diameter of the arc-shaped part of the storage box 1. After the stirring motor 601 is started, the output shaft of the stirring motor 601 drives the rotating shaft 602 to rotate. The rotating shaft 602 drives the connecting rod 603 and the stirring rod 604 on it to continuously stir the oxalic acid powder stored in the storage box 1 to prevent the oxalic acid powder from crystallizing. The stirring component is not limited to the above structure and can be any other structure that is conducive to stirring.

[0031] In one embodiment, an oxygen sensor is installed at one end of the acid inlet pipe 503 near the acid inlet of the degreasing furnace. The oxygen sensor can detect the oxygen content in the degreasing furnace. When the oxygen content in the degreasing furnace is detected to be outside the safe range (7%vol~73%vol), the process will be terminated and the supply of oxalic acid gas to the degreasing furnace will be stopped.

[0032] The embodiments described above are merely preferred embodiments of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications, improvements, and substitutions without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A defatting furnace acid-in structure, characterized by, The application relates to a storage tank (1) which is provided with a weighing mechanism (2) for weighing the storage tank (1), a hose (3) connected to the discharge port of the storage tank (1), a conveying mechanism (4) for conveying oxalic acid, and a gasification device (5) for gasifying the oxalic acid.

2. A furnace acid inlet structure according to claim 1, wherein The weighing mechanism (2) comprises a mounting frame (201) which can be mounted on a degreasing furnace and a weighing sensor (202) for weighing the storage tank (1), the weighing sensor (202) is mounted on the mounting frame (201) close to one side of the storage tank (1), and the sensing end of the weighing sensor (202) is fixedly connected with the storage tank (1).

3. A furnace acid inlet structure according to claim 2, wherein The weighing sensor (202) is symmetrically arranged on both sides of the storage tank (1).

4. The acid inlet structure for a degreasing furnace of claim 1, wherein The hose (3) is provided with a deformation part which is outwardly convex and deformed in a circumferential direction, and the flow area of the deformation part is larger than that of the rest of the hose (3).

5. A furnace acid inlet structure according to claim 1, wherein The conveying mechanism (4) comprises a screw conveyor, the feeding port of a conveying pipe (401) on the screw conveyor is communicated with the discharge port of the storage tank (1) through the hose (3), and the discharge port of the conveying pipe (401) is communicated with the gasification device (5).

6. A furnace acid inlet structure according to claim 1, wherein The gasification device (5) comprises a communication pipe (501) and a gasification pipeline (502), the feeding port of the communication pipe (501) is communicated with the discharge port of the conveying mechanism (4), the discharge port of the communication pipe (501) is communicated with the feeding port of the gasification pipeline (502), the outer side of the gasification pipeline (502) is provided with a heating wire for heating the internal oxalic acid, the gas outlet of the gasification pipeline (502) is provided with an acid feeding pipeline (503) for being communicated with the degreasing furnace, and the gasification pipeline (502) is provided with an air inlet port (504) for feeding nitrogen into the internal part.

7. A furnace acid inlet structure according to claim 6, wherein The axis of the gasification pipeline (502) is parallel to the horizontal plane, and the air inlet port (504) is close to the discharge port of the communication pipe (501).

8. A furnace acid inlet structure according to claim 6, wherein The gasification pipeline (502) is provided with a thermocouple (505) for detecting the internal temperature.

9. A furnace acid inlet structure according to claim 6, wherein The communication pipe (501) and the gasification pipeline (502) are both provided with an overhaul opening (506) for overhauling.

10. The acid inlet structure for a degreasing furnace of claim 1, wherein The storage tank (1) is provided with a stirring mechanism (6) for stirring the oxalic acid to prevent the oxalic acid from being crystallized, the stirring mechanism (6) comprises a stirring piece which is rotationally connected with the storage tank (1), an external stirring motor (601) is mounted on the storage tank (1), and the output shaft of the stirring motor (601) is fixedly connected with the stirring piece.

Images