Apparatus and method for precise control of ammonia flow in carbonitriding process
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- PROWORTH HEAT TREATMENT TECHNOLOGY (HUZHOU) CO LTD
- Filing Date
- 2026-04-27
- Publication Date
- 2026-08-07
AI Technical Summary
[0003]本发明的目的在于至少解决现有技术中存在的技术问题之一，提供用于碳氮共渗工艺中精确控制氨气流量的装置及方法，能够解决进入炉内的氨流量不稳，工艺中活性氮比例失控，碳氮共渗质量不稳定，造成产品硬度偏低及淬硬层组织不合格质量问题的问题
[0021](1) The device and method for precisely controlling the ammonia flow rate in the carbonitriding process, which uses a limiting round rod to separate the purification box from the sealing cover to remove the drying screen box and replace the internal molecular sieve, provides key optimization for the stability, economy and ammonia flow rate control accuracy of the carbonitriding process: In the carbonitriding process, the molecular sieve is prone to failure due to long-term contact with ammonia and process by-products. If it cannot be replaced in time after failure, it will lead to deviation in ammonia flow rate control, which will affect the quality of the workpiece diffusion layer. If the traditional device lacks the convenient separation structure of the limiting round rod, the replacement of the molecular sieve requires disassembling the main body of the device, which is not only time-consuming, but also easy to damage the sealing of the device, resulting in the interruption of the carbonitriding process. The interruption of the process will cause the workpiece in the furnace to be in a non-preset atmosphere, which may lead to diffusion layer oxidation, decarburization, or even batch scrapping, which will greatly increase the production cost. The limiting rod allows for quick separation of the purification chamber from the sealing cover, enabling direct removal of the drying mesh box for molecular sieve replacement without disassembling the main unit. This significantly reduces replacement time, avoids prolonged process interruptions, and ensures the workpieces inside the furnace remain in a stable carbonitriding atmosphere. It also reduces the defect rate of workpieces due to component replacement and prevents damage to the unit's seals during disassembly, thus preventing ammonia leakage. Furthermore, the convenient replacement design reduces maintenance costs: traditional disassembly and replacement requires specialized technicians and can easily damage seals, pipe interfaces, and other components. The limiting rod's separation structure simplifies the replacement operation, allowing ordinary maintenance personnel to complete the task, reducing specialized labor costs and avoiding additional wear and tear on auxiliary parts. Timely replacement of failed molecular sieves ensures consistently accurate and controllable ammonia flow, guaranteeing consistent carbonitriding layer quality for each batch of workpieces, improving product qualification rate and stability, and meeting the batch carbonitriding production needs of high-precision parts such as automotive gears and bearings.
Smart Images
Figure CN122522167A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of carbonitriding technology, and particularly to an apparatus and method for precisely controlling the ammonia flow rate in a carbonitriding process. Background Technology
[0002] The original sealed box-type multi-purpose furnace was used for carbonitriding, with propane and ammonia gas introduced into the furnace to complete the required carbon and nitrogen amounts for the process. Carbon was precisely controlled by a carbon controller and oxygen probe, while ammonia flow was controlled by a rotor flowmeter to enter the rear chamber as the nitriding medium. In actual production and with current domestic and international equipment, regardless of whether 316 stainless steel or agate rotor flowmeters are used to control the ammonia flow, variations in the volume, pressure, and distance of the liquid ammonia lead to unstable ammonia flow into the furnace. This results in uncontrolled active nitrogen ratios, unstable carbonitriding quality, and ultimately, low product hardness and substandard hardened layer microstructure. Summary of the Invention
[0003] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide an apparatus and method for precisely controlling the ammonia flow rate in the carbonitriding process, which can solve the problems of unstable ammonia flow rate entering the furnace, uncontrolled active nitrogen ratio in the process, unstable carbonitriding quality, resulting in low product hardness and unqualified hardened layer structure.
[0004] To achieve the above objectives, the present invention provides the following technical solution: a device for precisely controlling the ammonia flow rate in a carbonitriding process, comprising a purification box, a purification component, and a flow control component, wherein the purification box is provided with a feeding hopper, a limiting component, and a cleaning component;
[0005] A purification component is installed on the purification box. The purification component includes a metal filter screen and a drying mesh box. The interior of the drying mesh box is equipped with a molecular sieve.
[0006] The flow control assembly is located on the purification chamber. The flow control assembly includes a pressure control valve, a primary glass rotor flow meter, and a mass control flow meter. The pressure control valve is located on one side of the purification chamber, and the primary glass rotor flow meter and the mass control flow meter are located on the other side of the purification chamber.
[0007] Preferably, the limiting component includes a sealing cover, an extension plate, a fixing post, a front mounting block, a U-shaped side plate, a damping spring, a linkage movable plate, and a limiting round rod. A hopper is fixedly installed on the inner wall of the purification box, and the bottom of the hopper is fixedly installed with the bottom of the inner side of the purification box. An extension plate is fixedly installed on both the front and rear sides of the sealing cover, and a fixing post is fixedly installed at the bottom of the extension plate. A front mounting block is fixedly installed on both the front and rear sides of the purification box, and an opening is provided inside the front mounting block for the fixing post to move. The fixing post is located on the opening of the front mounting block.
[0008] Preferably, a U-shaped side plate is fixedly installed on one side of the mounting front block, a damping spring is fixedly installed on the inner wall of one side of the U-shaped side plate, a linkage movable plate is fixedly installed on one side of the damping spring, a limiting rod is fixedly installed on one side of the linkage movable plate, a damping spring is fixedly installed on the other side of the linkage movable plate, one end of the damping spring extends to one side of the U-shaped side plate and is fixedly installed with a handle, the damping spring and the U-shaped side plate are slidably installed, the interior of the mounting front block has a hole for the limiting rod to move, the interior of the fixing column has a limiting hole for the limiting rod to move, one end of the limiting rod passes through the hole on the mounting front block and extends into the limiting hole on the fixing column.
[0009] Preferably, the purification assembly further includes a mounting rod, a wiping plate, a square pull rod, a connecting vertical rod, a supporting vertical rod, a receiving plate, a strip block, a baffle, and a strip side plate. A metal filter screen is fixedly installed on the front inner wall and the rear inner wall of the purification box. A mounting rod is fixedly installed on the front inner wall and the rear inner wall of the purification box. A wiping plate is slidably installed on the outer wall of the mounting rod. A square pull rod is fixedly installed on the front side of the wiping plate. One end of the square pull rod extends to the front side of the purification box and is fixedly installed with a handle. The square pull rod and the purification box are slidably installed.
[0010] Preferably, a connecting vertical rod is fixedly installed at the bottom of the sealing cover, and a drying mesh box is fixedly installed at the bottom of the connecting vertical rod. The drying mesh box has a drying trough inside, which is filled with molecular sieves. A groove is opened at the top of the drying mesh box for the strip block to move, and a baffle is opened inside the drying mesh box for the baffle to move. A baffle is fixedly installed at the bottom of the strip block. The strip block and the baffle are respectively located in the groove and the baffle on the drying mesh box. A breathable mesh is embedded in the top and bottom of the drying mesh box. A supporting vertical rod is fixedly installed at the bottom of the drying mesh box, and a receiving plate is fixedly installed at the bottom of the supporting vertical rod. Strip side plates are fixedly installed on both sides of the inner walls of the purification box. Sliding grooves matching the strip side plates are opened on both sides of the drying mesh box and the receiving plate.
[0011] Preferably, the flow control assembly further includes an inlet pipe, an outlet pipe, and a connecting pipe. An inlet pipe is fixedly installed on one side of the purification chamber, with one end extending into the interior of the purification chamber. A pressure control valve is provided on the inlet pipe. An outlet pipe is fixedly installed on the other side of the purification chamber, with a connecting pipe fixedly installed at one end. The connecting pipe is equipped with an original glass rotor flow meter and a quality control flow meter, with the original glass rotor flow meter located to the side of the quality control flow meter.
[0012] Preferably, the cleaning assembly includes a high-pressure blower, an exhaust pipe, a connecting vertical pipe, a blower head, a discharge pipe, a base column, an annular receiving plate, a mounting side plate, a U-shaped front plate, a damping limit spring, a connecting fixing plate, a limit square rod, a sliding pull rod, and an exhaust pipe. An exhaust pipe is fixedly installed on the front side of the purification box, with one end of the exhaust pipe extending into the interior of the purification box. A high-pressure blower is fixedly installed on the top of the sealing cover, and an exhaust pipe is fixedly installed at the output end of the high-pressure blower. A connecting vertical pipe is fixedly installed on the top of the sealing cover, with one end of the connecting vertical pipe extending to the bottom of the sealing cover. One end of the exhaust pipe is fixedly connected to the other end of the connecting vertical pipe, and a blower head is fixedly installed at one end of the connecting vertical pipe.
[0013] Preferably, a discharge pipe is fixedly installed at the bottom of the purification box, a bottom column is fixedly installed at the bottom of the purification box, an installation side plate is fixedly installed on the outer wall of the annular receiving plate, an opening is opened inside the installation side plate for the bottom column to move, the bottom column is located in the opening on the installation side plate, a U-shaped front plate is fixedly installed on the front side of the installation side plate, a damping limit spring is fixedly installed on the inner wall of the front side of the U-shaped front plate, a connecting fixing plate is fixedly installed on the rear side of the damping limit spring, a limit square rod is fixedly installed on the rear side of the connecting fixing plate, a sliding pull rod is fixedly installed on the front side of the connecting fixing plate, one end of the sliding pull rod extends to the front side of the U-shaped front plate and is fixedly installed with a pull handle, and the sliding pull rod is slidably installed with the U-shaped front plate.
[0014] Preferably, the annular receiving plate has a receiving groove inside, and the inner wall of the receiving groove has a groove that matches the feeding pipe. The bottom of the feeding pipe is located in the groove. The mounting side plate has an opening inside for the movement of the limiting rod, and the bottom column has a limiting groove inside for the movement of the limiting rod. The limiting rod passes through the opening on the mounting side plate and extends into the limiting groove on the bottom column.
[0015] A method for precisely controlling ammonia flow rate in a carbonitriding process, characterized in that it includes:
[0016] Step 1: Drying and Filtration: Ammonia gas is delivered into the purification chamber through the inlet pipe. The pressure control valve ensures a stable flow of ammonia gas during delivery. Once inside the purification chamber, a metal filter removes impurities from the ammonia gas. The filtered ammonia gas then enters the drying chamber, where molecular sieves fill the chamber to dry it. Finally, the ammonia gas is discharged through the outlet pipe.
[0017] Step 2, Precise Adjustment: When ammonia gas is delivered to the inside of the connecting pipe through the output pipe, the original glass rotor flow meter on the connecting pipe can perform secondary flow control of ammonia gas. Subsequently, the mass control flow meter performs primary flow control of ammonia gas. The input end of the mass control flow meter is connected to the industrial control computer, and the digital flow rate can be directly set on the process curve on the touch screen. The mass flow meter is controlled by the PLC output to achieve the purpose of precise control of ammonia gas.
[0018] Step 3, Backflushing: When there are many impurities on the metal filter screen, start the high-pressure blower and deliver air to the inside of the blower head through the exhaust pipe and connecting vertical pipe. Finally, the air is discharged through the blower head to blow air onto the drying screen and metal filter screen. The blown air is discharged through the exhaust pipe, and the impurities will fall into the purification box. Then, pull the sliding rod to move the connecting fixing plate and the limiting rod. After moving the limiting rod, the bottom column can be separated from the mounting side plate, and the annular receiving plate can be taken out, which makes it easier to remove the impurities.
[0019] Step 4, Replacement Processing: When the molecular sieve is saturated, pull the damping spring to move the linkage movable plate and the limiting rod. After moving the limiting rod, the limiting on the fixed column and the front block can be removed. Then, pull the sealing cover upward to move the connecting vertical rod. When the connecting vertical rod moves, the drying screen and receiving plate can be removed from the inside of the purification box. Then, pull out the strip block and baffle to remove the molecular sieve filling the inside of the drying screen for replacement.
[0020] Compared with the prior art, the beneficial effects of the present invention are:
[0021] (1) The device and method for precisely controlling the ammonia flow rate in the carbonitriding process, which uses a limiting round rod to separate the purification box from the sealing cover to remove the drying screen box and replace the internal molecular sieve, provides key optimization for the stability, economy and ammonia flow rate control accuracy of the carbonitriding process: In the carbonitriding process, the molecular sieve is prone to failure due to long-term contact with ammonia and process by-products. If it cannot be replaced in time after failure, it will lead to deviation in ammonia flow rate control, which will affect the quality of the workpiece diffusion layer. If the traditional device lacks the convenient separation structure of the limiting round rod, the replacement of the molecular sieve requires disassembling the main body of the device, which is not only time-consuming, but also easy to damage the sealing of the device, resulting in the interruption of the carbonitriding process. The interruption of the process will cause the workpiece in the furnace to be in a non-preset atmosphere, which may lead to diffusion layer oxidation, decarburization, or even batch scrapping, which will greatly increase the production cost. The limiting rod allows for quick separation of the purification chamber from the sealing cover, enabling direct removal of the drying mesh box for molecular sieve replacement without disassembling the main unit. This significantly reduces replacement time, avoids prolonged process interruptions, and ensures the workpieces inside the furnace remain in a stable carbonitriding atmosphere. It also reduces the defect rate of workpieces due to component replacement and prevents damage to the unit's seals during disassembly, thus preventing ammonia leakage. Furthermore, the convenient replacement design reduces maintenance costs: traditional disassembly and replacement requires specialized technicians and can easily damage seals, pipe interfaces, and other components. The limiting rod's separation structure simplifies the replacement operation, allowing ordinary maintenance personnel to complete the task, reducing specialized labor costs and avoiding additional wear and tear on auxiliary parts. Timely replacement of failed molecular sieves ensures consistently accurate and controllable ammonia flow, guaranteeing consistent carbonitriding layer quality for each batch of workpieces, improving product qualification rate and stability, and meeting the batch carbonitriding production needs of high-precision parts such as automotive gears and bearings.
[0022] (2) The device and method for accurately controlling the ammonia flow rate in the carbonitriding process, through the combined use of a pressure control valve, the original glass rotor flow meter and the mass control flow meter, the pressure control valve is used to ensure that the ammonia pressure in the pipeline is constant and flows to the multi-purpose furnace equipment. The original glass rotor flow meter is used for high-level secondary flow control on the multi-purpose furnace manifold, and a mass control flow meter is added for primary flow control. The input end of the mass flow meter is connected to the industrial control computer, and the digital flow rate can be directly set on the process curve of the touch screen. The mass flow meter is controlled by the PLC output to achieve the purpose of accurately controlling the ammonia flow, which solves the problem of unstable ammonia flow and greatly improves product quality.
[0023] (3) The device and method for precisely controlling the ammonia flow rate in the carbonitriding process, through the design of back-blowing treatment of the drying screen and metal filter screen by a high-pressure blower, and the impurity removal structure that separates the feed pipe from the annular receiving plate by a limiting square rod, provides dual optimization for precise control of ammonia flow rate and device maintenance efficiency: the high-pressure blower can back-blow the drying screen and metal filter screen, which can remove the impurities accumulated inside in time. If these impurities accumulate for a long time, they will block the flow channel of the drying screen or affect its flow regulation accuracy, causing the ammonia flow rate to fluctuate. Traditional cleaning requires disassembling the parts, which is easy to interrupt the process; while the back-blowing treatment can complete the impurity cleaning online without disassembling the device, avoiding process interruption, ensuring long-term stability of ammonia flow rate, reducing the defect rate of workpieces caused by flow deviation, and reducing the failure of the drying screen due to impurity blockage, extending its service life and reducing the cost of consumable replacement. In addition, the limiting rod allows the feed pipe to quickly separate from the annular receiving plate, making it easy to remove impurities blown down from inside the device. Traditional impurity removal requires disassembling the entire device or multiple connecting parts, which is not only time-consuming but also easily damages the device's seal and increases maintenance difficulty. The convenient separation design eliminates the need for complex disassembly, allowing impurities to be removed in just a few minutes, shortening maintenance time, preventing ammonia leakage, and preventing impurities from falling back into the device during the removal process. This ensures that the drying screen and metal filter screen remain clean and unobstructed for a long time, further maintaining the dryness of the ammonia. Attached Figure Description
[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments:
[0025] Figure 1 This is a perspective view of the present invention;
[0026] Figure 2 This is a side view of the present invention;
[0027] Figure 3 A cross-sectional view of the front block of the present invention;
[0028] Figure 4 This is a cross-sectional view of the purification chamber of the present invention;
[0029] Figure 5 This is a bottom view of the drying mesh box of the present invention;
[0030] Figure 6 This is a cross-sectional view of the drying mesh box of the present invention;
[0031] Figure 7 This is a cross-sectional view of the annular receiving plate of the present invention;
[0032] Figure 8 This is a bottom view of the metal filter screen of the present invention.
[0033] Reference numerals: 1. Purification box; 2. Feed hopper; 3. Limiting component; 301. Sealing cover; 302. Extension plate; 303. Fixing column; 304. Mounting front block; 305. U-shaped side plate; 306. Damping spring; 307. Linkage movable plate; 308. Limiting round rod; 4. Purification component; 401. Metal filter screen; 402. Mounting rod; 403. Wiping plate; 404. Square pull rod; 405. Connecting vertical rod; 406. Drying mesh box; 407. Supporting vertical rod; 408. Receiving plate; 409. Molecular sieve; 410. Strip block; 411. Baffle; 5. Flow Quantity control components; 501, air inlet pipe; 502, pressure control valve; 503, output pipe; 504, connecting pipe; 505, original glass rotor flow meter; 506, quality control flow meter; 6, cleaning components; 601, high-pressure blower; 602, exhaust pipe; 603, connecting riser pipe; 604, blower head; 605, discharge pipe; 606, base column; 607, annular receiving plate; 608, mounting side plate; 609, U-shaped front plate; 610, damping limit spring; 611, connecting fixing plate; 612, limit square rod; 613, sliding tie rod; 614, exhaust pipe. Detailed Implementation
[0034] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.
[0035] Please see Figures 1-8 This invention provides a technical solution: a device for precisely controlling the ammonia flow rate in a carbonitriding process, comprising a purification chamber 1, a purification component 4, and a flow control component 5. The purification chamber 1 is equipped with a hopper 2, a limiting component 3, and a cleaning component 6. The purification component 4 is disposed on the purification chamber 1 and includes a metal filter screen 401 and a drying screen box 406. The drying screen box 406 has a molecular sieve 409 inside. The flow control component 5 is disposed on the purification chamber 1 and includes a pressure control valve 502, a primary glass rotor flow meter 505, and a mass control flow meter 506. The pressure control valve 502 is located on one side of the purification chamber 1, and the primary glass rotor flow meter 505 and the mass control flow meter 506 are located on the other side of the purification chamber 1.
[0036] Furthermore, the limiting assembly 3 includes a sealing cover 301, an extension plate 302, a fixing post 303, a front mounting block 304, a U-shaped side plate 305, a damping spring 306, a linkage movable plate 307, and a limiting round rod 308. A discharge hopper 2 is fixedly installed on the inner wall of the purification chamber 1, and the bottom of the discharge hopper 2 is fixedly installed to the inner bottom of the purification chamber 1. Extension plates 302 are fixedly installed on both the front and rear sides of the sealing cover 301, and a fixing post 303 is fixedly installed at the bottom of the extension plate 302. Front mounting blocks 304 are fixedly installed on both the front and rear sides of the purification chamber 1. The interior of mounting block 304 has an opening for the movable fixing post 303. The fixing post 303 is located on the opening of the mounting front block 304. A U-shaped side plate 305 is fixedly installed on one side of the mounting front block 304. A damping spring 306 is fixedly installed on the inner wall of one side of the U-shaped side plate 305. A linkage movable plate 307 is fixedly installed on one side of the damping spring 306. A limit rod 308 is fixedly installed on one side of the linkage movable plate 307. The other side of the linkage movable plate 307 is fixedly installed with the damping spring 306. One end of the damping spring 306 extends to one side of the U-shaped side plate 305 and is fixed. The device is equipped with a handle, and the damping spring 306 and U-shaped side plate 305 are slidably mounted. The interior of the mounting block 304 has a hole for the movement of the limiting rod 308, and the interior of the fixing column 303 has a limiting hole for the movement of the limiting rod 308. One end of the limiting rod 308 passes through the hole on the mounting block 304 and extends into the limiting hole on the fixing column 303. The limiting rod 308 enables the separation of the purification box 1 from the sealing cover 301 to remove the drying mesh box 406 for replacement of the internal molecular sieve 409. This design ensures the stability, economy, and ammonia flow of the carbonitriding process. Key optimizations in flow control accuracy: In the carbonitriding process, the molecular sieve 409 is prone to failure due to long-term contact with ammonia and process byproducts. If it cannot be replaced in time after failure, it will lead to deviation in ammonia flow control, which in turn will affect the quality of the carbonitriding layer. If traditional equipment lacks a convenient separation structure with a limiting rod 308, replacing the molecular sieve 409 requires disassembling the main body of the equipment, which is not only time-consuming but also easily damages the sealing of the equipment, causing the carbonitriding process to be interrupted. The interruption of the process will cause the workpiece in the furnace to be in a non-preset atmosphere, which may result in oxidation of the carbonitriding layer, decarburization, or even batch scrapping, significantly increasing production costs.The limiting rod 308 can quickly separate the purification box 1 from the sealing cover 301, allowing direct removal of the drying mesh box 406 to replace the molecular sieve 409 without disassembling the main body of the device. This significantly shortens replacement time, avoids prolonged process interruptions, ensures that the workpieces inside the furnace are always in a stable carbonitriding atmosphere, reduces the defect rate of workpieces caused by component replacement, and avoids damage to the device's sealing during disassembly, preventing ammonia leakage. In addition, the convenient replacement design also reduces maintenance costs: traditional disassembly and replacement requires professional technicians and is prone to damaging seals, pipe interfaces, and other components. The separation structure of the limiting rod 308 makes the replacement operation simpler, which can be completed by ordinary maintenance personnel, reducing professional labor costs and avoiding additional wear and tear on auxiliary parts. Furthermore, timely replacement of the failed molecular sieve 409 ensures that the ammonia flow rate is always accurately controllable, guaranteeing consistent carbonitriding layer quality for each batch of workpieces, improving product qualification rate and stability, and adapting to the batch carbonitriding production needs of high-precision parts such as automotive gears and bearings.
[0037] Furthermore, the purification assembly 4 also includes a mounting rod 402, a wiping plate 403, a square pull rod 404, a connecting vertical rod 405, a supporting vertical rod 407, a receiving plate 408, a strip block 410, a baffle 411, and a strip side plate 412. A metal filter screen 401 is fixedly installed on the front and rear inner walls of the purification chamber 1. The mounting rod 402 is fixedly installed on the front and rear inner walls of the purification chamber 1. A wiping plate 403 is slidably installed on the outer wall of the mounting rod 402. A square pull rod 404 is fixedly installed on the front side of the wiping plate 403. One end of the square pull rod 404 extends to the front of the purification chamber 1 and is fixedly fitted with a handle. The square pull rod 404 is slidably installed with the purification chamber 1. A connecting vertical rod 405 is fixedly installed at the bottom of the sealing cover 301. A drying mesh box 406 is fixedly installed at the bottom of the connecting vertical rod 405. The drying mesh box 406 has a drying trough inside, which is filled with molecular sieve 409. The top of the drying mesh box 406 has a groove for the strip block 410 to move. The inside of the drying mesh box 406 has a baffle 411 to move. The bottom of the strip block 410 is fixedly installed with the baffle 411. The strip block 410 and the baffle 411 are located in the groove and the baffle 411 on the drying mesh box 406, respectively. The top and bottom of the drying mesh box 406 are inlaid with breathable mesh. The bottom of the drying mesh box 406 is fixedly installed with a support vertical rod 407. The bottom of the support vertical rod 407 is fixedly installed with a receiving plate 408. The inner walls of both sides of the purification box 1 are fixedly installed with strip side plates 412. The sides of the drying mesh box 406 and the receiving plate 408 are both provided with sliding grooves that match the strip side plates 412.
[0038] Furthermore, the flow control assembly 5 also includes an inlet pipe 501, an outlet pipe 503, and a connecting pipe 504. An inlet pipe 501 is fixedly installed on one side of the purification chamber 1, with one end extending into the interior of the purification chamber 1. A pressure control valve 502 is installed on the inlet pipe 501. An outlet pipe 503 is fixedly installed on the other side of the purification chamber 1, with a connecting pipe 504 fixedly installed at one end. The connecting pipe 504 is equipped with a primary glass rotor flow meter 505 and a mass control flow meter 506. The primary glass rotor flow meter 505 is located... On one side of the mass control flow meter 506, the pressure control valve 502 is used to ensure that the ammonia pressure in the pipeline is constant and flows to the multi-purpose furnace equipment. The original glass rotor flow meter 505 is used for high-level secondary flow control on the multi-purpose furnace manifold. A mass control flow meter 506 is added for primary flow control. The input end of the mass flow meter is connected to the industrial control computer. The digital flow can be set directly on the process curve on the touch screen. The mass flow meter is controlled by the PLC output to achieve precise control of ammonia, which solves the problem of unstable ammonia flow and greatly improves product quality.
[0039] Secondly, the cleaning component 6 includes a high-pressure blower 601, an exhaust pipe 602, a connecting vertical pipe 603, a blower head 604, a discharge pipe 605, a base column 606, an annular receiving plate 607, a mounting side plate 608, a U-shaped front plate 609, a damping limit spring 610, a connecting fixing plate 611, a limit square rod 612, a sliding pull rod 613, and an exhaust pipe 614. An exhaust pipe 614 is fixedly installed on the front side of the purification box 1, with one end extending into the interior of the purification box 1. A high-pressure blower 601 is fixedly installed on the top of the sealing cover 301, and an exhaust pipe 602 is fixedly installed at the output end of the high-pressure blower 601. A connecting vertical pipe 603 is fixedly installed on the top of the sealing cover 301. One end of 603 extends to the bottom of the sealing cover 301. One end of the exhaust pipe 602 is fixedly connected to the other end of the connecting vertical pipe 603. A blower head 604 is fixedly installed at one end of the connecting vertical pipe 603. A discharge pipe 605 is fixedly installed at the bottom of the purification box 1. A base column 606 is fixedly installed at the bottom of the purification box 1. An installation side plate 608 is fixedly installed on the outer wall of the annular receiving plate 607. An opening for the base column 606 to move is opened inside the installation side plate 608. The base column 606 is located in the opening on the installation side plate 608. A U-shaped front plate 609 is fixedly installed on the front side of the installation side plate 608. A damping limit spring 610 is fixedly installed on the inner wall of the front side of the U-shaped front plate 609. A connecting plate 611 is fixedly installed on the rear side of the 10. A limiting rod 612 is fixedly installed on the rear side of the connecting plate 611. A sliding rod 613 is fixedly installed on the front side of the connecting plate 611. One end of the sliding rod 613 extends to the front side of the U-shaped front plate 609 and is fixedly installed with a pull handle. The sliding rod 613 and the U-shaped front plate 609 are slidably installed. A receiving groove is opened inside the annular receiving plate 607. A groove matching the feeding pipe 605 is opened on the inner wall of the receiving groove. The bottom of the feeding pipe 605 is located in the groove. An opening for the limiting rod 612 to move is opened inside the mounting side plate 608. A limiting rod 612 to move is opened inside the bottom column 606. The groove, the limiting rod 612 passes through the opening on the mounting side plate 608 and extends into the limiting groove on the bottom column 606. The back-blowing design of the high-pressure blower 601 for the drying screen box 406 and the metal filter screen 401, and the impurity removal structure that separates the feed pipe 605 from the annular receiving plate 607 by the limiting rod 612, provide dual optimization for the precise control of ammonia flow and the efficiency of equipment maintenance: the high-pressure blower 601 can back-blow the drying screen box 406 and the metal filter screen 401, which can remove the impurities accumulated inside in time. If these impurities accumulate for a long time, they will block the flow channel of the drying screen box 406 or affect its flow regulation accuracy, causing the ammonia flow to fluctuate. Traditional cleaning requires disassembling parts, which is easy to interrupt the process.Backflushing can clean impurities online without disassembling the device, avoiding process interruptions, ensuring long-term stable ammonia flow, reducing the defect rate of workpieces due to flow deviations, and reducing failure of the drying screen 406 due to impurity blockage, extending its service life and reducing consumable replacement costs. Furthermore, the limiting rod 612 allows for quick separation of the discharge pipe 605 from the annular receiving plate 607, facilitating the removal of impurities backflushed from the device. Traditional impurity removal requires disassembling the entire device or multiple connecting parts, which is time-consuming, easily damages the device's seal, and increases maintenance difficulty. The convenient separation design eliminates the need for complex disassembly, allowing impurities to be removed in minutes, shortening maintenance time, preventing ammonia leakage, and preventing impurities from re-spreading back into the device during removal. This ensures that the drying screen 406 and metal filter 401 remain clean and unobstructed, further maintaining ammonia dryness.
[0040] Methods for precisely controlling ammonia flow rate in carbonitriding processes include:
[0041] Step 1, Drying and Filtration: Ammonia gas is delivered to the interior of the purification chamber 1 through the inlet pipe 501. The pressure control valve 502 is set to stabilize the flow of ammonia gas during delivery. When the ammonia gas is delivered to the interior of the purification chamber 1, impurities inside the ammonia gas are filtered through the metal filter screen 401. The filtered ammonia gas then enters the interior of the drying screen box 406. The molecular sieve 409 filled inside the drying screen box 406 dries the ammonia gas. Finally, the ammonia gas is discharged through the outlet pipe 503.
[0042] Step 2, Precise Adjustment: When ammonia gas is delivered to the inside of the connecting pipe 504 through the output pipe 503, the original glass rotor flow meter 505 on the connecting pipe 504 can perform secondary flow control of the ammonia gas. Subsequently, the mass control flow meter 506 performs primary flow control of the ammonia gas. The input end of the mass control flow meter 506 is connected to the industrial control computer, and the digital flow rate can be directly set on the process curve on the touch screen. The mass flow meter is controlled by the PLC output to achieve the purpose of precise control of ammonia gas.
[0043] Step 3, Backflushing: When there are many impurities on the metal filter 401, the high-pressure blower 601 is started and the air is delivered to the inside of the blower head 604 through the exhaust pipe 602 and the connecting vertical pipe 603. Finally, the air is discharged through the blower head 604 to blow air onto the drying screen box 406 and the metal filter 401. The blown air is discharged through the exhaust pipe 614, and the impurities will fall into the purification box 1. Then, the sliding rod 613 is pulled to move the connecting fixing plate 611 and the limiting square rod 612. After the limiting square rod 612 is moved, the bottom column 606 can be separated from the mounting side plate 608, and the annular receiving plate 607 can be taken out, so as to facilitate the removal of impurities.
[0044] Step 4, Replacement Processing: When the molecular sieve 409 is saturated, pull the damping spring 306 to move the linkage movable plate 307 and the limiting rod 308. After moving the limiting rod 308, the limiting on the fixed column 303 and the installation front block 304 can be removed. Then, pull the sealing cover 301 upward to move the connecting vertical rod 405. When the connecting vertical rod 405 moves, the drying screen box 406 and the receiving plate 408 can be removed from the interior of the purification box 1. Then, pull out the strip block 410 and the baffle 411 to remove the molecular sieve 409 filled inside the drying screen box 406 for replacement.
[0045] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.
Claims
1. A device for precisely controlling the ammonia flow rate in a carbonitriding process, characterized in that, include: The purification box (1) is equipped with a feeding hopper (2), a limiting component (3) and a cleaning component (6); Purification component (4) is provided on the purification box (1). The purification component (4) includes a metal filter screen (401) and a drying mesh box (406). The interior of the drying mesh box (406) is provided with a molecular sieve (409). A flow control assembly (5) is provided on the purification chamber (1). The flow control assembly (5) includes a pressure control valve (502), a primary glass rotor flow meter (505), and a mass control flow meter (506). The pressure control valve (502) is located on one side of the purification chamber (1), and the primary glass rotor flow meter (505) and the mass control flow meter (506) are located on the other side of the purification chamber (1).
2. The device for precisely controlling the ammonia flow rate in a carbonitriding process according to claim 1, characterized in that: The limiting component (3) includes a sealing cover (301), an extension plate (302), a fixing post (303), a front mounting block (304), a U-shaped side plate (305), a damping spring (306), a linkage movable plate (307), and a limiting round rod (308). A feeding hopper (2) is fixedly installed on the inner wall of the purification box (1). The bottom of the feeding hopper (2) is fixedly installed with the bottom of the inner side of the purification box (1). An extension plate (302) is fixedly installed on both the front and rear sides of the sealing cover (301). A fixing post (303) is fixedly installed at the bottom of the extension plate (302). A front mounting block (304) is fixedly installed on both the front and rear sides of the purification box (1). An opening is provided inside the front mounting block (304) for the fixing post (303) to move. The fixing post (303) is located on the opening of the front mounting block (304).
3. The device for precisely controlling the ammonia flow rate in a carbonitriding process according to claim 2, characterized in that: A U-shaped side plate (305) is fixedly installed on one side of the mounting block (304). A damping spring (306) is fixedly installed on the inner wall of one side of the U-shaped side plate (305). A linkage movable plate (307) is fixedly installed on one side of the damping spring (306). A limit rod (308) is fixedly installed on one side of the linkage movable plate (307). A damping spring (306) is fixedly installed on the other side of the linkage movable plate (307). One end of the damping spring (306) extends... A handle is fixedly installed on one side of the U-shaped side plate (305). The damping spring (306) is slidably installed on the U-shaped side plate (305). The interior of the mounting block (304) is provided with a hole for the movement of the limiting rod (308). The interior of the fixing column (303) is provided with a limiting hole for the movement of the limiting rod (308). One end of the limiting rod (308) passes through the hole on the mounting block (304) and extends into the limiting hole on the fixing column (303).
4. The device for precisely controlling the ammonia flow rate in a carbonitriding process according to claim 3, characterized in that: The purification assembly (4) also includes an installation rod (402), a wiping plate (403), a square pull rod (404), a connecting vertical rod (405), a supporting vertical rod (407), a receiving plate (408), a strip block (410), a baffle (411), and a strip side plate (412). A metal filter screen (401) is fixedly installed on the front inner wall and the rear inner wall of the purification box (1). An installation rod (402) is fixedly installed on the front inner wall and the rear inner wall of the purification box (1). A wiping plate (403) is slidably installed on the outer wall of the installation rod (402). A square pull rod (404) is fixedly installed on the front side of the wiping plate (403). One end of the square pull rod (404) extends to the front side of the purification box (1) and is fixedly installed with a handle. The square pull rod (404) and the purification box (1) are slidably installed.
5. The device for precisely controlling the ammonia flow rate in a carbonitriding process according to claim 4, characterized in that: A connecting vertical rod (405) is fixedly installed at the bottom of the sealing cover (301), and a drying mesh box (406) is fixedly installed at the bottom of the connecting vertical rod (405). The drying mesh box (406) has a drying trough inside, which is filled with molecular sieves (409). The top of the drying mesh box (406) has a groove for the movement of the strip block (410), and the inside of the drying mesh box (406) has a baffle groove for the movement of the baffle (411). The bottom of the strip block (410) is fixedly installed with a baffle (411). 410) and baffle (411) are respectively located in the groove and the material blocking groove on the drying mesh box (406). The top and bottom of the drying mesh box (406) are inlaid with breathable mesh. The bottom of the drying mesh box (406) is fixedly installed with a support vertical rod (407). The bottom of the support vertical rod (407) is fixedly installed with a receiving plate (408). The inner walls on both sides of the purification box (1) are fixedly installed with strip side plates (412). The drying mesh box (406) and the receiving plate (408) are both provided with sliding grooves that match the strip side plates (412).
6. The device for precisely controlling the ammonia flow rate in a carbonitriding process according to claim 5, characterized in that: The flow control assembly (5) also includes an inlet pipe (501), an outlet pipe (503), and a connecting pipe (504). An inlet pipe (501) is fixedly installed on one side of the purification box (1). One end of the inlet pipe (501) extends into the interior of the purification box (1). A pressure control valve (502) is provided on the inlet pipe (501). An outlet pipe (503) is fixedly installed on the other side of the purification box (1). A connecting pipe (504) is fixedly installed on one end of the outlet pipe (503). An original glass rotor flow meter (505) and a quality control flow meter (506) are provided on the connecting pipe (504). The original glass rotor flow meter (505) is located on one side of the quality control flow meter (506).
7. The device for precisely controlling the ammonia flow rate in a carbonitriding process according to claim 6, characterized in that: The cleaning assembly (6) includes a high-pressure blower (601), an exhaust pipe (602), a connecting vertical pipe (603), a blower head (604), a discharge pipe (605), a base column (606), an annular receiving plate (607), a mounting side plate (608), a U-shaped front plate (609), a damping limit spring (610), a connecting fixing plate (611), a limit square rod (612), a sliding pull rod (613), and an exhaust pipe (614). The exhaust pipe (614) is fixedly installed on the front side of the purification box (1). One end of the duct extends into the interior of the purification box (1). A high-pressure blower (601) is fixedly installed on the top of the sealing cover (301). An exhaust pipe (602) is fixedly installed at the output end of the high-pressure blower (601). A connecting vertical pipe (603) is fixedly installed on the top of the sealing cover (301). One end of the connecting vertical pipe (603) extends to the bottom of the sealing cover (301). One end of the exhaust pipe (602) is fixedly connected to the other end of the connecting vertical pipe (603). A blower head (604) is fixedly installed at one end of the connecting vertical pipe (603).
8. The apparatus for precisely controlling the ammonia flow rate in a carbonitriding process according to claim 7, characterized in that: A discharge pipe (605) is fixedly installed at the bottom of the purification box (1), a bottom column (606) is fixedly installed at the bottom of the purification box (1), and an installation side plate (608) is fixedly installed on the outer wall of the annular receiving plate (607). An opening is provided inside the installation side plate (608) for the bottom column (606) to move. The bottom column (606) is located in the opening on the installation side plate (608). A U-shaped front plate (609) is fixedly installed on the front side of the installation side plate (608). A damping limiting spring (610) is fixedly installed on the inner wall. A connecting fixing plate (611) is fixedly installed on the rear side of the damping limiting spring (610). A limiting square rod (612) is fixedly installed on the rear side of the connecting fixing plate (611). A sliding pull rod (613) is fixedly installed on the front side of the connecting fixing plate (611). One end of the sliding pull rod (613) extends to the front side of the U-shaped front plate (609) and is fixedly installed with a pull handle. The sliding pull rod (613) and the U-shaped front plate (609) are slidably installed.
9. The device for precisely controlling the ammonia flow rate in a carbonitriding process according to claim 8, characterized in that: The annular receiving plate (607) has a receiving groove inside, and the inner wall of the receiving groove has a groove that matches the feeding pipe (605). The bottom of the feeding pipe (605) is located in the groove. The mounting side plate (608) has an opening inside for the movement of the limiting rod (612). The bottom column (606) has a limiting groove inside for the movement of the limiting rod (612). The limiting rod (612) passes through the opening on the mounting side plate (608) and extends into the limiting groove on the bottom column (606).
10. The method for precisely controlling ammonia flow rate in a carbonitriding process according to claim 8, characterized in that, include: S1. Drying and filtration: Ammonia is transported to the interior of the purification box (1) through the air inlet pipe (501), and the ammonia is stabilized during the ammonia transport by the pressure control valve (502). When the ammonia is transported to the interior of the purification box (1), the impurities inside the ammonia are filtered through the metal filter screen (401). Then the filtered ammonia enters the interior of the drying screen box (406). The ammonia is dried through the molecular sieve (409) filled inside the drying screen box (406). Finally, the ammonia is discharged through the output pipe (503). S2. Precise adjustment: When ammonia is delivered to the inside of the connecting pipe (504) through the output pipe (503), the original glass rotor flow meter (505) on the connecting pipe (504) can perform secondary flow control of ammonia. Then, the mass control flow meter (506) can perform primary flow control of ammonia. The input end of the mass control flow meter (506) is connected to the industrial control computer. The digital flow can be directly set on the process curve on the touch screen. The mass flow meter is controlled by the PLC output to achieve the purpose of precise control of ammonia. S3. Backflushing treatment: When there are many impurities on the metal filter screen (401), the high-pressure blower (601) is started and the air is delivered to the inside of the blower head (604) through the exhaust pipe (602) and the connecting vertical pipe (603). Finally, the air is discharged through the blower head (604) to blow the drying screen box (406) and the metal filter screen (401). The blown air is discharged through the exhaust pipe (614), and the impurities will fall into the purification box (1). Then, the sliding rod (613) is pulled to drive the connecting fixing plate (611) and the limiting square rod (612) to move. After the limiting square rod (612) is moved, the bottom column (606) can be separated from the mounting side plate (608) and the annular receiving plate (607) can be taken out, so as to facilitate the removal of impurities. S4. Replacement process: When the molecular sieve (409) is saturated, pull the damping spring (306) to drive the linkage movable plate (307) and the limiting rod (308) to move. After the limiting rod (308) is moved, the limiting of the fixed column (303) and the installation front block (304) can be canceled. Then, pull the sealing cover (301) upward to drive the connecting vertical rod (405) to move. When the connecting vertical rod (405) moves, the drying mesh box (406) and the receiving plate (408) can be taken out of the interior of the purification box (1). Then, pull out the strip block (410) and the baffle (411) to take out the molecular sieve (409) filled inside the drying mesh box (406) for replacement.