CN116042989A

CN116042989A - Pre-vacuumizing controlled atmosphere carburizing and quenching production line

Info

Publication number: CN116042989A
Application number: CN202211630377.6A
Authority: CN
Inventors: 刘德才; 蔡荣昌
Original assignee: Deya Furnace Technology Jiangsu Co ltd
Current assignee: Deya Furnace Technology Jiangsu Co ltd
Priority date: 2022-12-19
Filing date: 2022-12-19
Publication date: 2023-05-02

Abstract

The invention discloses a pre-vacuumizing controlled atmosphere carburizing and quenching production line, which relates to the technical field of heat treatment equipment and comprises the following steps: the device comprises a material preparation table, a first multipurpose furnace and a second multipurpose furnace, wherein the front side of the first multipurpose furnace is communicated with a cleaning machine through a vacuum pump, a rotary skip for sliding feeding is arranged at the material inlet side of the cleaning machine, the material preparation table is arranged at the front side of the travel of the rotary skip, the vacuum pump is also communicated between the second multipurpose furnace and the first multipurpose furnace, and a low-temperature tempering furnace is arranged at one side of the first multipurpose furnace; according to the invention, through the designed vacuum pump, the function of pre-vacuumizing the front chamber body can be added to replace nitrogen to press in and exchange air, so that the residual air, oil smoke and nitrogen methanol atmosphere in the furnace are greatly reduced, the heat treatment quality of the product is improved, the whole production line is automatically operated according to process arrangement, and the equipment integration degree and treatment effect are improved.

Description

Pre-vacuumizing controlled atmosphere carburizing and quenching production line

Technical Field

The invention relates to the technical field of heat treatment equipment, in particular to a pre-vacuumizing controlled atmosphere carburizing and quenching production line.

Background

In the production process of workpieces, in order to ensure the hardness and strength of the workpieces, quenching heat treatment is generally required after production, the existing quenching heat treatment process plate generally needs to preheat the workpieces and then temper the workpieces, and the quenching process is widely applied in the modern mechanical manufacturing industry. Important parts in machinery, especially steel parts used in automobiles, airplanes and rockets, are almost all subjected to quenching treatment. In order to meet the technical requirements of various parts, various quenching processes are developed. Carburizing and quenching is a common heat treatment process for metal materials, and can enable the surface of a workpiece permeated with carbon to obtain high hardness and improve the wear resistance degree of the workpiece. The traditional process mainly comprises the following steps: low temperature tempering, precooling direct quenching, primary heating quenching, carburizing high temperature tempering, secondary quenching cold treatment and induction heating after carburization.

In the prior art, the equipment of the heat treatment production line for carburizing and quenching has the advantages of high energy consumption, short service life, poor uniformity of furnace temperature, poor sealing performance, low degree of automation, poor safety, direct injury to production personnel in the production process, reduced production efficiency and incapability of well meeting the use requirement.

Disclosure of Invention

The invention aims to provide a pre-vacuumizing controlled atmosphere carburizing and quenching production line which can achieve the effect of convenient maintenance.

The technical aim of the invention is realized by the following technical scheme: a pre-evacuated controlled atmosphere carburizing and quenching production line, comprising: the device comprises a material preparation table, a first multipurpose furnace and a second multipurpose furnace, wherein the front side of the first multipurpose furnace is communicated with a cleaning machine through a vacuum pump, a rotary skip for sliding feeding is arranged on the side of a material inlet of the cleaning machine, the material preparation table is arranged on the front side of a travel of the rotary skip, the second multipurpose furnace is also communicated with the first multipurpose furnace through the vacuum pump, a low-temperature tempering furnace is arranged on one side of the first multipurpose furnace, a high-temperature tempering furnace is arranged on one side of the second multipurpose furnace, a lifting table body is communicated on one side of the high-temperature tempering furnace, the lifting table body is arranged on the front side of the material preparation table, and an air cooling table is arranged on one side of the high-temperature tempering furnace.

As a further description of the above technical solution:

the first multipurpose furnace comprises a front chamber body and a rear chamber body, wherein a first furnace door main body is arranged on the front side of the front chamber body, a slow cooling chamber is arranged on one side of the front chamber body, a push-pull chain is connected on one side of the first furnace door main body, a furnace door lifting cylinder is arranged at the top of the front chamber body and connected to the top of the front chamber body, a quenching oil groove is arranged on the front side of the front chamber body, and an oil stirrer is arranged in an inner cavity of the quenching oil groove.

As a further description of the above technical solution:

the front chamber body is communicated with the rear chamber body through a middle transition chamber, a middle door box and a corresponding opening and closing door body are arranged on one side, close to the front chamber body, of the rear chamber body, an observation port is formed in the rear side of the rear chamber body, a rear limiting rod is arranged on one side of the rear chamber body, and a first furnace lining is arranged in the rear chamber body.

As a further description of the above technical solution:

the front chamber body one side is equipped with the evacuation hole, and rear chamber body top is provided with first circulation fan package and electric heater, and is provided with cooling fan at front chamber body top, and cooling fan one side is equipped with cooling water circulating device and pipeline, and well door case top is provided with explosion-proof equipment, and explosion-proof equipment comprises clamp plate, sealing washer, screw rod, pressure spring for the gas that surpasses the critical value in the discharge furnace, the front chamber body both sides correspond the position and are provided with stop device and lower stop device respectively.

As a further description of the above technical solution:

the low-temperature tempering furnace and the high-temperature tempering furnace have the same structure, the low-temperature tempering furnace comprises a furnace shell, a furnace body cavity is arranged in the furnace shell, a second furnace liner is arranged at the top of the furnace shell, a second furnace door main body is arranged on one side of the furnace shell, a smoke exhaust hood is arranged at the top of the second furnace door main body, a second circulating fan bag is arranged at the top of the furnace shell, and a thermocouple and an air taking port are arranged at the top of the furnace shell.

As a further description of the above technical solution:

the rotary skip comprises a walking roller, one side of the walking roller is communicated with a wire collector through a chain, a frame body is arranged outside the wire collector, a support material table is arranged on one side of the walking roller, the support material table is connected to one side of the frame, and a push-pull material device is arranged at the top of the support material table.

As a further description of the above technical solution:

one side of the low-temperature tempering furnace is provided with a control chamber, and the control chamber is sealed and connected with a vacuum pump, a cleaning machine, a first multipurpose furnace, a second multipurpose furnace, a high-temperature tempering furnace, a lifting table body and a material preparation table in a control manner.

As a further description of the above technical solution:

the quenching lifting table is connected to one side of the front chamber body, the quenching lifting table is located on one side of the lifting table body, the lifting table lifting cylinder is arranged at the top of the front chamber body, and the lifting table lifting cylinder is in transmission connection with one side of the quenching lifting table.

As a further description of the above technical solution:

the cleaning machine comprises a front chamber and a rear chamber, wherein the front chamber is cleaned and sprayed by alkali liquor, and the rear chamber is sprayed and dried by clean water.

As a further description of the above technical solution:

the first furnace lining and the second furnace lining are made of the same material, the first furnace lining and the second furnace lining are ceramic fiber modules containing zirconium, and the first furnace lining and the second furnace lining are connected with corresponding positions through pre-buried anchoring pieces.

Compared with the prior art, the beneficial effect of this scheme is as follows:

1. according to the invention, through the designed vacuum pump, the function of pre-vacuumizing the front chamber body can be added to replace nitrogen to press in and exchange air, so that the residual air, oil smoke and nitrogen methanol atmosphere in the furnace are greatly reduced, the heat treatment quality of the product is improved, the whole production line is automatically operated according to process arrangement, and the equipment integration degree and treatment effect are improved.

2. In the invention, the first furnace lining and the second furnace lining are made of ceramic fiber modules containing zirconium, and the fiber modules are connected with the shell through the embedded anchoring pieces, so that when the heat preservation blocks in the first furnace lining or the second furnace lining are damaged, the damaged parts can be singly replaced without large-area replacement.

Drawings

FIG. 1 is a schematic diagram of a life production line flow of a pre-vacuumizing controlled atmosphere carburizing and quenching production line;

FIG. 2 is a schematic diagram of a cross-sectional structure of a first multi-purpose furnace of a pre-vacuumizing controlled atmosphere carburizing and quenching production line;

FIG. 3 is a schematic diagram of a top view angle structure of a first multi-purpose furnace of a pre-vacuumizing controlled atmosphere carburizing and quenching production line;

FIG. 4 is a schematic diagram of a low-temperature tempering furnace of a pre-vacuumizing controlled atmosphere carburizing and quenching production line;

fig. 5 is a schematic diagram of a rotary skip car structure of a pre-vacuumizing controlled atmosphere carburizing and quenching production line.

In the figure: 1. a vacuum pump; 2. a cleaning machine; 3. a first multi-purpose furnace; 301. an upper limit device; 302. a lower limit device; 303. a cooling fan; 304. a first circulation fan package; 305. an explosion-proof device; 306. an electric heater; 307. a rear limit rod; 308. a first furnace lining; 309. an observation port; 310. a rear chamber body; 311. a middle door box; 312. lifting cylinder of lifting table; 313. a slow cooling chamber; 314. a furnace door lifting cylinder; 315. a quenching lifting table; 316. pushing the zipper; 317. a first door body; 318. a front chamber body; 319. an oil agitator; 320. a quenching oil tank; 321. an intermediate transition chamber; 4. a second multi-purpose furnace; 5. a low temperature tempering furnace; 501. a furnace shell; 502. a second furnace lining; 503. a second oven door body; 504. a smoke exhaust hood; 505. a thermocouple; 506. an air taking port; 507. a second circulation fan package; 6. rotating the skip car; 601. a walking roller; 602. a pushing and pulling device; 603. a support material stage; 604. a frame; 605. a wire winding device; 7. a control room; 8. a high temperature tempering furnace; 9. lifting the table body; 10. a material preparation table; 11. and an air cooling table.

Detailed Description

The invention will now be further described by way of specific examples with reference to the accompanying drawings, which are given by way of illustration only and not by way of limitation.

Example 1

Referring to fig. 1-5, the present invention provides a technical solution: the pre-vacuumizing controlled atmosphere carburizing and quenching production line comprises a material preparation table 10, a first multipurpose furnace 3 and a second multipurpose furnace 4, wherein the front side of the first multipurpose furnace 3 is communicated with a cleaning machine 2 through a vacuum pump 1, a rotary skip 6 for sliding feeding is arranged on the material inlet side of the cleaning machine 2, the material preparation table 10 is arranged on the front side of the travel of the rotary skip 6, a vacuum pump 1 is also communicated between the second multipurpose furnace 4 and the first multipurpose furnace 3, a low-temperature tempering furnace 5 is arranged on one side of the first multipurpose furnace 3, a high-temperature tempering furnace 8 is arranged on one side of the second multipurpose furnace 4, a lifting table 9 is communicated on one side of the high-temperature tempering furnace 8, the lifting table 9 is positioned on the front side of the material preparation table 10, and an air cooling table 11 is arranged on one side of the high-temperature tempering furnace 8;

the air cooling stage 11 is used for air cooling of the workpiece. Comprises a bracket, a wind scooper and a cooling system.

Wherein, the material preparation lifting table is of a steel plate structure, and the upper part of the material preparation lifting table is provided with a roller. The two sides are made of galvanized materials with the diameter of D76 multiplied by 3.0mm by adopting a turning roller, the speed of a three-phase speed reducing motor is fixed, and the conveying efficiency is 15 furnaces/hour. The object carrying lifting platform is of a steel plate structure and is provided with rollers, guide rails, a hydraulic system, a hydraulic working cylinder and a limit switch; a special lifting operation button is arranged beside the lifting table, and a power supply is introduced through a pre-buried steel pipe

The first multipurpose furnace 3 comprises a front chamber body 318 and a rear chamber body 310, wherein a first furnace door main body 317 is arranged on the front side of the front chamber body 318, a slow cooling chamber 313 is arranged on one side of the front chamber body 318, a push-pull chain 316 is connected on one side of the first furnace door main body 317, a furnace door lifting cylinder 314 is arranged at the top of the front chamber body 318, the furnace door lifting cylinder 314 is connected at the top of the front chamber body 318, a quenching oil groove 320 is arranged on the front side of the front chamber body 318, and an oil stirrer 319 is arranged in an inner cavity of the quenching oil groove 320;

the front chamber body 318 and the rear chamber body 310 are communicated through a middle transition chamber 321, a middle door box 311 and a corresponding opening and closing door body are arranged on one side of the rear chamber body 310 close to the front chamber body 318, an observation port 309 is arranged on the rear side of the rear chamber body 310, a rear limit rod 307 is arranged on one side of the rear chamber body 310, and a first furnace lining 308 is arranged in the rear chamber body 310;

the front chamber body 318 one side is equipped with the evacuation hole, and rear chamber body 310 top is provided with first circulation fan package 304 and electric heater 306, and front chamber body 318 top is provided with cooling fan 303, and cooling fan 303 one side is equipped with cooling water circulating device and pipeline, and well door case 311 top is provided with explosion-proof equipment 305, and explosion-proof equipment 305 comprises clamp plate, sealing washer, screw rod and pressure spring for the gas that surpasses the critical value in the discharge furnace, front chamber body 318 both sides correspond the position and are provided with stop device 301 and lower stop device 302 respectively.

The implementation mode specifically comprises the following steps: the front chamber body 318 mainly comprises an outer furnace door, a shell, a lifting platform body 9, a top slow cooling chamber 313, a push-pull chain 316 device, a quenching oil groove 320 and an explosion-proof device 305;

the side plates of the front chamber furnace shell 501 are 12mm thick and are provided with reinforcing ribs, the thicknesses of the front and rear door frames are 30mm, and the front chamber furnace shell 501 is a non-airtight combined steel plate and section steel welding structure and has enough rigidity and stability;

all the welding is continuous sealing welding, and after welding, the kerosene seepage is checked, and necessary holes, cover flanges and connecting pieces are reserved on the welding;

the thickness of the side plate of the shell of the slow cooling chamber 313 is 8mm, the thickness of the oil wall plate is 6mm, and all the welding is continuous sealing welding, and necessary orifices, cover flanges and connecting pieces are reserved on the welding; 1.1.2 quenching oil groove 320 with a thickness of 8mm, a spacing between densely distributed reinforcing ribs of less than 300mm, and performing continuous seal welding, wherein a necessary orifice, a cover flange and a connecting piece are reserved on the oil groove after the welding and the kerosene leakage inspection;

the oil tank is internally provided with an oil stirrer 319 and a powerful circulating device, the power of a motor arranged on one side of the oil tank of a variable frequency stirrer is more than or equal to 6KW, the stirring speed can be set in a process program, and three stages can be set for each quenching: the rotating speed and the duration time of the stirring device, namely stationary, rapid stirring and slow stirring stages;

an electric heater 306 is arranged in the quenching oil, a tubular electric heater 306 is adopted, an oil filling hole is reserved in an oil groove and is sealed by a sealing cover, the equipment operation is not influenced during oil filling, and an oil level observation window is a magnetic float level gauge;

the heating chamber consists of a hearth, a furnace lining, a middle door, a radiant tube heating system, a furnace bottom roller and a rail, a rear driving system, a fan stirring system, an atmosphere injection system and a measuring system;

the number of the radiant tubes is 22 in total, the number of the radiant tubes is 9 from left to right, and the number of the radiant tubes is 4 at the bottom of the furnace, so that the uniformity of the hearth of the main furnace is ensured, and the maintenance space of the radiant tubes is fully considered;

the radiant tube is vertically hung between the first furnace lining 308 and the air-guiding muffle, the radiant tube is made of high-quality heat-resistant steel and has a round bottom structure, a spiral electric heating element and a ceramic pad are arranged in the radiant tube, and the service life of the radiant tube assembly exceeds two years;

in order to ensure uniform furnace atmosphere, a circulating fan made of heat-resistant alloy is arranged at the top of the heating chamber, the circulating fan is a circulating fan for an industrial furnace, water cooling is adopted, a cooling water circulating device and a pipeline are arranged, and the circulating fan can normally operate under the condition of water cut and power failure, so that maintenance cost is reduced;

the air guide muffle is formed by combining a plurality of silicon carbide blocks, so that the furnace gas forms good guide circulation, meanwhile, the temperature difference of the heat radiation of the radiant tube to the parts is reduced, and the uniformity of the temperature and atmosphere in the working area is ensured;

the middle furnace door is used for heat insulation and driven by a motor;

the first furnace lining 308 adopts a high-quality zirconium-containing refractory lining structure, the side wall, the rear wall and the top of the furnace body are formed by combining fiber blankets and fiber modules, each fiber module is connected with the shell through a pre-buried anchor, so that the thermal short circuit is reduced, after the laying of the furnace top is completed, a plurality of times of curing agents are sprayed on the surface of the furnace top, so that the furnace top has better wind erosion resistance and spalling resistance, the furnace bottom is of a square structure, the furnace bottom and the furnace shell 501 are tightly welded into a whole, a high-alumina brick support is paved on the furnace bottom, and a silicon carbide guide rail is paved on the upper part of the furnace bottom in combination with the high-alumina brick;

the furnace door is sealed and formed by welding a 30mm steel plate and a reinforcing rib, the contact surface of the furnace door frame plate and the sealing ring of the front chamber door frame plate needs to be leveled, the control flatness is within 0.5mm, the air tightness during vacuumizing can be ensured, the furnace door is not deformed, the lifting mechanism of the furnace door is driven by a cylinder, the whole mechanism comprises a channel steel track, a track roller, a connecting shaft, a connecting rod, a door closing top tightening wheel and an upper limiting part and a lower limiting part, and the connection of a cylinder joint and the furnace door can be finely adjusted, so that the dimension of the furnace door can be conveniently adjusted when the furnace door is opened and closed;

the cylinder stretches out when the door is closed, presses the door frame 604 of the furnace, the furnace door is attached to the door frame plate of the front chamber under the action of the connecting rod, the furnace door is pressed against the door frame plate along the pressing wheel until the high-temperature-resistant silica gel strip on the door frame plate is pressed against the furnace door, and the actions are opposite when the furnace door is opened;

the zipper pushing 316 mechanism is composed of a push-pull head, a compact roller chain, a chain warehouse, a large chain wheel, a small chain wheel and a speed reducing motor, after a product enters the front chamber, the speed reducing motor drives the chain wheel to drive the roller chain to slide out of the chain warehouse, at the moment, the push-pull head at the end of the roller chain pushes the material frame, the material frame passes through the middle chamber along a linear track to reach a heating chamber, after the material frame reaches a designated position, the roller chain pulls the push-pull head to retract into the chain warehouse, when the material frame is prepared from the heating chamber, the zipper pushing 316 slides out again, a claw of the push-pull head grabs the material frame, the material frame is pulled back to the front chamber, after the action is completed, the claw of the chain breaks away from the material frame, and the roller chain is retracted into the chain warehouse;

the quenching lifting table 315 is a double-layer material table and consists of a roller path table, a guide composite roller, a track channel steel, an up-and-down limiting device, a transition roller and a material disc detection device, the quenching lifting table 315 plays a role in supporting a material frame to slide to a heating chamber and a quenching and slow cooling chamber 313 for cooling, the roller path table is connected with a frame 604 provided with the composite guide roller to perform up-and-down lifting action, the quenching lifting table 315 is driven by two cylinders, the cylinders pull the lifting table frame 604, the guide composite roller rolls in the track channel steel to perform lifting action, and the up-and-down limiting device 302 detects the position of a lifting node;

the material tray detection consists of two infrared gratings, and when the material frame reaches the front chamber, the material tray detection plays a role in detecting whether the material frame reaches a preset position;

the explosion-proof device 305 consists of a pressing plate, a sealing ring, a screw rod and a pressure spring, can effectively discharge the gas exceeding the critical value in the furnace in time, and plays an explosion-proof role;

the vacuum pumping part adopts a Japanese inlet vacuum pump 1 group and a pressure switch interlocking safety device, when the furnace is in and out operation, the vacuum pump 1 is started, and after the pressure switch detects that the requirements are met, an electric signal is given to the furnace door device, so that the vacuum pump 1 and the furnace door are interlocked in operation;

the safety device and the nitrogen automatic purging device are used for automatically cutting off the supply of process gas when the power supply or the gas source is interrupted and the temperature in the furnace is lower than 760 ℃, simultaneously automatically filling nitrogen into the furnace to protect equipment safety, and automatically supplementing high-pressure nitrogen when negative pressure occurs in the front chamber quenching.

If the thermocouple 505 breaks or the temperature of the furnace is over-temperature, the furnace automatically stops heating and alarms, a fire curtain is arranged outside the front door, when the fire curtain is not combusted, the front chamber door cannot be opened and alarms, the front chamber and the heating chamber are provided with a tray position detection device, and if the tray is not transferred in place, the next step cannot be executed and alarms.

The heating of the quenching oil tank 320 is stopped and alarmed when the oil agitator 319 fails, the quenching oil level is overrun, and the quenching oil is overtemperature.

Example 2

2-3, the low-temperature tempering furnace 5 and the high-temperature tempering furnace 8 are identical in structure, the low-temperature tempering furnace 5 comprises a furnace shell 501, a furnace body cavity is arranged in the furnace shell 501, a second furnace lining 502 is installed at the top of the furnace shell 501, a second furnace door body 503 is arranged on one side of the furnace shell 501, a smoke exhaust hood 504 is arranged at the top of the second furnace door body 503, a second circulating fan bag 507 is arranged at the top of the furnace shell 501, a thermocouple 505 and an air taking port 506 are arranged at the top of the furnace shell 501, a travelling trolley 6 comprises a travelling roller 601, one side of the travelling roller 601 is communicated with a wire collector 605 through a chain, a frame body is installed outside the wire collector 605, a support material table 603 is arranged on one side of the travelling roller 601, the support material table 603 is connected to one side of the frame 604, and a push-pull material device 602 is arranged at the top of the support material table 603.

In practical application, the charge-discharge car consists of a moving device, a bracket material table 603, a push-pull material device 602 and the like, is used for charging and discharging of a multipurpose furnace, a cleaning machine 2, a tempering furnace and a material frame, and transportation and transfer of workpieces among the devices, has a charge-discharge function, realizes fast and slow conversion through a variable frequency speed regulating motor when the car runs, and is switched to a slow speed when the car approaches a target device, until a positioning indicator light is automatically stopped when the car is on, the charge-discharge operation can be performed at the moment, and a skip material receiving mechanism has a rotating function and can rotate 180 DEG along the material disc to bidirectionally charge and discharge along two sides of a track;

the collecting rail is used for the safe sliding power transmission device of the skip car, and the safe sliding power transmission device of the engineering plastic shell adopts a high-quality plastic conduit as the shell, so that the insulating performance is excellent, and the flame retardant property is good;

the multistage transmission guide rail is installed in the pipe, the structure is compact and small, the current collector moves flexibly in the pipe, the electric brush contacts with the transmission guide rail stably and reliably, the product is hoisted singly, the installation and maintenance are convenient, arc-shaped bent pipes with different radiuses can be manufactured, the special requirements of engineering equipment are met, the horn ingress pipe is further arranged, the current collector is convenient to derail, and the rail model is: DHG3-8-25/120; number of poles: 8 poles; rated current: 120A; the type of the matched current collector is as follows: JD-8-25;

consists of a furnace shell 501, a second furnace door body 503, a heating system, a stirring device in the furnace and a fume exhausting device;

the maximum temperature is 750 ℃, a heat-insulating brick/heat-insulating cotton mixed heat-insulating layer is adopted, a heat-resistant steel flow-guiding muffle sleeve is arranged in the hearth, a heating element is arranged between the inner wall of the hearth and the muffle sleeve, and furnace gas passes through a centrifugal fan arranged on the top to form a good flow-guiding heating system, so that uniform heating is ensured, and the temperature deviation is small.

The thickness of the steel plate of the furnace shell 501 is 6mm, the furnace shell is sealed and fully welded, the internal welding reinforcing ribs are reinforced, and the furnace shell 501 is provided with necessary holes, cover flanges and connecting pieces;

the second furnace door main body 503 is of a heat insulation type, a steel plate is welded to the shell, and asbestos modules are filled in the second furnace door main body, so that the heat insulation effect is well achieved; the heating system is composed of a thermocouple 505, a temperature controller, a heater, a refractory heat-insulating brick, a refractory fiber heat-insulating material and the like; the stirring device in the furnace consists of a stirring motor, a heat-resistant steel fan and a transmission mechanism; the smoke exhaust device consists of a smoke exhaust fan and a flue and is used for reducing the oil smoke generated during tempering;

the low-temperature tempering furnace 5 consists of a furnace shell 501, a furnace door, a heating system and a fume exhaust device; the maximum temperature is 450 ℃, the tempering furnace structure adopts a heat insulation cotton heat insulation layer, a steel guide muffle sleeve is arranged in a furnace chamber, a heating element is arranged between the inner wall of the furnace chamber and the muffle sleeve, and furnace gas passes through a centrifugal fan arranged on the top to form a good guide heating system, so that uniform heating is ensured, and the temperature deviation is small.

Example 3

Unlike the embodiment 1-2, the control chamber 7 is arranged on one side of the low-temperature tempering furnace 5, the control chamber 7 is sealed and connected with the vacuum pump 1, the cleaning machine 2, the first multipurpose furnace 3, the second multipurpose furnace 4, the high-temperature tempering furnace 8, the lifting table 9 and the material preparation table 10 in a control manner, the quenching lifting table 315 is connected on one side of the front chamber 318, the quenching lifting table 315 is positioned on one side of the lifting table 9, the lifting table lifting cylinder 312 is arranged on the top of the front chamber 318, the lifting table lifting cylinder 312 is in transmission connection with one side of the quenching lifting table 315, the cleaning machine 2 comprises a front chamber and a rear chamber, the front chamber is sprayed by alkali liquor cleaning, the rear chamber is sprayed and dried by clear water, the first furnace liner 308 and the second furnace liner 502 are made of the same materials, the first furnace liner 308 and the second furnace liner 502 are zirconium-containing ceramic fiber modules, and the first furnace liner 308 and the second furnace liner 502 are connected with corresponding positions by pre-embedded anchors;

the implementation mode specifically comprises the following steps: the cleaning machine 2 adopts a front-chamber alkali liquor cleaning spray and rear-chamber clean water spray drying structure; the main body of the cleaning machine 2 consists of an alkali water tank, a clean water tank, a spray chamber, a drying chamber, an ultrasonic system, a micro-bubble jet system, an oil-water separation system, a drying and stirring device and an electrical control system.

The alkaline water tank is arranged at the front part of the cleaning machine 2 and consists of a heater, a circulating device, an ultrasonic device, a water temperature control device and a water level detector, the alkaline water tank main body is formed by welding national standard carbon steel, and the side wall heat insulation material of the tank body keeps heat and prevents heat from radiating;

the water temperature control mode comprises the following steps: the maximum water quantity is 4500L when the stainless steel tube type electric heater 3065Kw is multiplied by 9, 45Kw is adopted as one set of the temperature detection end thermocouple 505; the water tank circulation device is a forced water pump circulation mode, so that water circulation between the main tank and the side tank is realized, oil on the surface of the main tank is concentrated in the side tank, a motor 4P1.1KW is arranged at the rotating speed of 1450rpm, ultrasonic generators are arranged at the left side, the right side and the bottom of the equipment, communication is realized by ultrasonic and electric control, and a water level gauge 2 sleeve, an automatic water supply device 1 sleeve and a thermocouple 5051 sleeve are controlled;

the clear water tank is arranged at the rear part of the cleaning machine 2, and the rest is consistent with the alkaline water tank;

lifting systems are arranged in the alkali water tank and the clean water tank; the cleaning device is formed by welding profile steel, a workpiece is placed in cleaning liquid when a lifter descends, the workpiece penetrates up and down in the cleaning process to enhance the cleaning effect, the workpiece is placed in a spraying position when the lifter ascends, the lifter is a steel structural member with supporting spokes, a reducing motor is driven to use, the reducing motor comprises a chain transmission pair, and guide rails and guide grooves which are fixed with a cleaning chamber are arranged on two sides of the lifter; the lifting of the lifting platform is controlled by a cam impact limit switch fixed on a lifting shaft of the lifting platform; table guiding and positioning: the strength is enough not to sink, the positioning is accurate, and the pushing is ensured to be stable.

The drying chamber is located the back room of cleaning machine 2, and hot-blast generator produces hot-blast blowing to the work piece from the back room both sides, carries out the blowing to the work piece after the hot water sprays, and the drying chamber main part is strengthened by steel sheet welded structure, and main part shaped steel is below to be the clear water tank, and the room body lateral wall insulating material keeps warm, prevents the heat and gives off, service temperature: a common thermometer is used for 80-130 ℃ and the temperature control mode is as follows: electric resistance heating is 15Kw, a fan forced circulation mode of the hot air circulation device is adopted, a motor 4P is 0.55KW, and the rotating speed is 1450rpm.

The oil-water separator is arranged beside the cleaning machine 2, oil and water at the uppermost layer of the side tank of the cleaning tank are pumped into the separator, oil and water are separated through a special structure, the separated water flows back into the cleaning tank, the cleaning machine 2 is provided with two disc-type special oil-water separators which are respectively used for separating unemulsified oil in an alkaline water tank and a cleaning water tank, a liquid level control pump, a circulating pump and an oil overflow pipe are arranged, and after the oil-water separator works for 20 minutes, floating oil can be cleaned.

The top of the alkali water tank and the top of the clean water tank are provided with a spray system, and the spray system consists of a chamber body, a spray pipe and a nozzle; the maximum pressure of the water pump reaches 6bar, the number of spray heads of each groove is 24, the spray angle is 60 degrees, and the workpiece after hot water soaking and spraying is sprayed; the side wall of the spray chamber main body is provided with a heat insulation material for heat preservation, so that heat dissipation is prevented, and accessory parts are arranged: and 4 safety pin holes.

Carrying out subsurface jet flow on a processed workpiece, spraying and cleaning on the liquid surface, generating a large number of microbubbles by using a microbubble generating device when carrying out subsurface jet flow cleaning on the processed workpiece, removing oil on the surface of the workpiece by using the blasting force of the microbubbles, removing a deposited garbage port, arranging one cleaning liquid tank and one hot water tank respectively, arranging a plurality of groups of spray heads with rotation in a cleaning chamber, and ensuring that all the workpieces in an effective area are sprayed and cleaned, wherein the cleaning liquid tank and the hot water tank comprise a detachable nozzle, a spray pipe and a connecting piece; the spray pump is arranged on the rear base of the cleaning chamber and comprises necessary pipeline valves, pressure indicating instruments and the like;

further, the waste gas purification system consists of a spraying area, a dust remover, a fan, a circulating water tank, a water pump, a water quantity regulating valve, a water outlet pipe, a liquid level sensor and a water supplementing pipe, waste gas discharged by the furnace enters the dust remover tangentially through the spraying area by a pipeline, air flow is accelerated in the front spraying area and then sprays washing water into a fine water curtain shape, the air flow and the washing water rotate at a relatively high speed to enable a medium carrying harmful objects to be closely mixed with the water curtain, then water and the air flow are separated in the dust remover, the separated air flow is discharged into a circulating water tank with an automatic oil skimmer at the bottom by a water outlet pipe, and clean air is discharged into the atmosphere by the fan.

Working principle: the rotary skip 6 transports the products on the preset stock table 10, and the products are respectively transported into the first multi-purpose furnace 3 and the second multi-purpose furnace 4 through the current collecting tracks according to the production process, and are treated through the low-temperature tempering furnace 5 and the cleaning machine 2, so that the quenching process is completed.

The present embodiment is only for explanation of the present invention and is not to be construed as limiting the present invention, and modifications to the present embodiment, which may not creatively contribute to the present invention as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present invention.

Claims

1. A pre-evacuated controlled atmosphere carburizing and quenching production line, comprising: the automatic feeding device is characterized in that a cleaning machine (2) is arranged on the front side of the first multipurpose furnace (3) through a vacuum pump (1), a rotary skip (6) for sliding feeding is arranged on the feed inlet side of the cleaning machine (2), the material preparation table (10) is arranged on the front side of the travel of the rotary skip (6), the vacuum pump (1) is also arranged between the second multipurpose furnace (4) and the first multipurpose furnace (3), a low-temperature tempering furnace (5) is arranged on one side of the first multipurpose furnace (3), a high-temperature tempering furnace (8) is arranged on one side of the second multipurpose furnace (4), a lifting table body (9) is arranged on one side of the high-temperature tempering furnace (8), and the lifting table body (9) is arranged on the front side of the material preparation table (10), and an air cooling table (11) is arranged on one side of the high-temperature tempering furnace (8).

2. The pre-vacuumizing controlled atmosphere carburizing and quenching production line according to claim 1, wherein the first multipurpose furnace (3) comprises a front chamber body (318) and a rear chamber body (310), a first furnace door main body (317) is arranged on the front side of the front chamber body (318), a slow cooling chamber (313) is arranged on one side of the front chamber body (318), a push-pull chain (316) is connected on one side of the first furnace door main body (317), a furnace door lifting cylinder (314) is arranged at the top of the front chamber body (318), the furnace door lifting cylinder (314) is connected at the top of the front chamber body (318), a quenching oil groove (320) is arranged on the front side of the front chamber body (318), and an oil stirrer (319) is arranged in an inner cavity of the quenching oil groove (320).

3. The pre-vacuumizing controlled atmosphere carburizing and quenching production line according to claim 2, wherein the front chamber body (318) and the rear chamber body (310) are communicated through an intermediate transition chamber (321), a middle door box (311) and a corresponding opening and closing door body are arranged on one side, close to the front chamber body (318), of the rear chamber body (310), an observation port (309) is arranged on the rear side of the rear chamber body (310), a rear limit rod (307) is arranged on one side of the rear chamber body (310), and a first furnace lining (308) is arranged in the rear chamber body (310).

4. A pre-vacuumizing controlled atmosphere carburizing and quenching production line according to claim 3, wherein a vacuumizing hole is formed in one side of the front chamber body (318), a first circulating fan bag (304) and an electric heater (306) are arranged at the top of the rear chamber body (310), a cooling fan (303) is arranged at the top of the front chamber body (318), a cooling water circulation device and a pipeline are arranged on one side of the cooling fan (303), an explosion-proof device (305) is arranged at the top of the middle door box (311), the explosion-proof device (305) is composed of a pressing plate, a sealing ring, a screw rod and a pressure spring and is used for discharging gas exceeding a critical value in the furnace, and an upper limiting device (301) and a lower limiting device (302) are respectively arranged at corresponding positions on two sides of the front chamber body (318).

5. The pre-vacuumizing controlled atmosphere carburizing and quenching production line according to claim 4, wherein the low-temperature tempering furnace (5) and the high-temperature tempering furnace (8) are identical in structure, the low-temperature tempering furnace (5) comprises a furnace shell (501), a furnace body cavity is arranged in the furnace shell (501), a second furnace lining (502) is arranged at the top of the furnace shell (501), a second furnace door main body (503) is arranged on one side of the furnace shell (501), a smoke exhaust hood (504) is arranged at the top of the second furnace door main body (503), a second circulating fan bag (507) is arranged at the top of the furnace shell (501), and a thermocouple (505) and a gas taking port (506) are arranged at the top of the furnace shell (501).

6. The pre-vacuumizing controlled atmosphere carburizing and quenching production line according to claim 1, wherein the rotary skip (6) comprises a walking roller (601), one side of the walking roller (601) is communicated with a wire collector (605) through a chain, a frame body is arranged outside the wire collector (605), a support material table (603) is arranged on one side of the walking roller (601), the support material table (603) is connected to one side of the frame (604), and a pushing and pulling device (602) is arranged at the top of the support material table (603).

7. The pre-vacuumizing controlled atmosphere carburizing and quenching production line according to claim 1 is characterized in that a control chamber (7) is arranged on one side of the low-temperature tempering furnace (5), and the control chamber (7) is in control connection with the vacuum pump (1), the cleaning machine (2), the first multipurpose furnace (3), the second multipurpose furnace (4), the high-temperature tempering furnace (8), the lifting table body (9) and the material preparation table (10) in a closed mode.

8. A pre-vacuumizing controlled atmosphere carburizing and quenching production line according to claim 3, wherein a quenching lifting table (315) is connected to one side of the front chamber body (318), the quenching lifting table (315) is located on one side of the lifting table body (9), a lifting table lifting cylinder (312) is arranged at the top of the front chamber body (318), and the lifting table lifting cylinder (312) is in transmission connection with one side of the quenching lifting table (315).

9. The pre-vacuumized controlled atmosphere carburizing and quenching production line according to claim 1, wherein the cleaning machine (2) comprises a front chamber and a rear chamber, the front chamber is sprayed by alkali liquor cleaning, and the rear chamber is dried by clear water spraying.

10. The pre-vacuumizing controlled atmosphere carburizing and quenching production line according to claim 5, wherein the first furnace lining (308) and the second furnace lining (502) are made of the same material, the first furnace lining (308) and the second furnace lining (502) are ceramic fiber modules containing zirconium, and the first furnace lining (308) and the second furnace lining (502) are connected with corresponding positions through pre-buried anchoring pieces.