Rare earth permanent magnet intelligent production line

Abstract

The utility model discloses a rare earth permanent magnet intelligent production line which comprises a sealed magnetic field pressing machine, a pressed blank conveying device, a boxing box, a conveying material box and a vacuum sintering furnace. The multiple sealed magnetic field presses are arranged side by side, one end of each sealed magnetic field press is connected with the side face of the pressed blank conveying device, and one end of the pressed blank conveying device is connected with the boxing box. The rare earth alloy powder is pressed into a pressed blank by the sealed magnetic field pressing machine, then the pressed blank is conveyed to a conveying belt arranged in the pressed blank conveying device, and the pressed blank is conveyed into a boxing box through the conveying belt; in the boxing box, the pressed blank is placed in a sintering material box placed in the boxing box. The number of the vacuum sintering furnaces is more than two. The conveying material box can move to the opposite face of the boxing box and the vacuum sintering furnace and is in butt joint with the boxing box and the vacuum sintering furnace.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of advanced equipment, and particularly relates to a rare earth permanent magnet intelligent production line for manufacturing rare earth permanent magnet materials. BACKGROUND

[0002] The industrial preparation of the rare earth permanent magnet material generally adopts powder metallurgy technology, rare earth permanent magnet alloy is made into 3-5 mu powder, is oriented and formed under a magnetic field, is sealed and packaged, is isostatic pressed, is taken out and vacuum sintered after removing the packaging, and the rare earth permanent magnet sintered blank, that is, the rare earth permanent magnet material, is obtained. The rare earth permanent magnet powder is extremely easy to oxidize and can burn itself in the atmosphere, and must be isolated from the atmosphere in the production process of the rare earth permanent magnet. The oxidation problem in the production process has been restricting the development of the industry, and seriously affects the consistency of the product. At present, the press equipment and the vacuum sintering furnace equipment used in the industry have the phenomenon that the production line adaptation degree is not good, and the process between the alloy powder forming and the sintered blank, that is, the preparation of the material, the placing and boxing, the stacking of the material box into the furnace, and the transportation of the material between the processes, the taking out of the sintered blank, and the like, mostly need manual operation to complete, which will bring several problems, including that the material is easy to be exposed to the external environment during manual operation, leading to different degrees of oxidation and affecting the further improvement of the performance of the rare earth permanent magnet material; in addition, manual operation will not only reduce the production efficiency, consume human resources and increase the production cost, but also affect the stability of the product quality due to the uncertainty of the manual operation, and bring a certain bad rate to the product production. Therefore, it is urgent to develop a highly automated and intelligent rare earth permanent magnet material preparation industrialization equipment with better production line adaptation degree to change the status quo in the industry. SUMMARY

[0003] In order to solve the above problems, the utility model provides a rare earth permanent magnet intelligent production line for manufacturing high-quality rare earth permanent magnet materials.

[0004] The utility model provides a rare earth permanent magnet intelligence production line, including sealed magnetic field press, press blank conveying device, box filling box, transmission material box and vacuum sintering furnace. Transmission material box is filled with protective gas. Sealed magnetic field press has more than 2, is arranged side by side. Press blank conveying device includes press blank conveying casing and conveyer belt, and the conveyer belt is arranged in press blank conveying casing. The one end of each sealed magnetic field press is connected to the side of press blank conveying casing. Box filling box includes box filling box casing, material box moving device and third isolation valve, and the third isolation valve is arranged in the one end of box filling box casing. The one end of press blank conveying casing is connected with box filling box casing, and the conveyer belt extends into box filling box casing, and the material box moving device can move horizontally and up and down. After sealed magnetic field press presses rare earth alloy powder into press blank, moves to the conveyer belt arranged in press blank conveying casing. Sealed magnetic field press, press blank conveying device and box filling box constitute the closed space isolated with atmosphere, and fill in the protective gas in the inside. Sealed magnetic field press completes powder filling, magnetic field forming and moves the press blank after forming to the conveyer belt in press blank conveying casing under the protective atmosphere. When the conveyer belt rotates, the conveyer belt conveys press blank into box filling box casing. Press blank conveying device is the public transmission channel of multiple sealed magnetic field presses, and can convey the press blank pressed by each sealed magnetic field press into box filling box. In box filling box, press blank is loaded into the sintering material box placed on material box moving device. Transmission material box includes transmission material box casing, material box clamping lifting device, longitudinal moving device, transverse moving device and second isolation valve. The second isolation valve is connected with transmission material box casing. Transmission material casing is installed on transverse moving device, and longitudinal moving device drives transmission material box casing to move on transverse moving device together with second isolation valve. Transmission material box is more than 1, and vacuum sintering furnace is more than 2, and vacuum sintering furnace is arranged side by side. The one end of vacuum sintering furnace is provided with first isolation valve. Transmission material box can move to the opposite side of box filling box and vacuum sintering furnace through transverse movement respectively, and then realizes the butt joint with box filling box and vacuum sintering furnace respectively through longitudinal movement. After transmission material box is butt jointed with box filling box, opens second isolation valve and third isolation valve, and the space in transmission material box is communicated with the space in box filling box, and material box moving device can move with sintering material box between box filling box and transmission material box. After closing second isolation valve and third isolation valve, the independent space isolated with atmosphere is formed in box filling box and transmission material box respectively. After transmission material box is butt jointed with vacuum sintering furnace, opens first isolation valve and second isolation valve, and the space in transmission material box is communicated with the space in vacuum sintering furnace, and sintering material box can move between vacuum sintering furnace and transmission material box. After closing second isolation valve and first isolation valve, the independent space isolated with atmosphere is formed in transmission material box and vacuum sintering furnace respectively.

[0005] In an embodiment of the utility model, the box filling box further includes a press blank grabbing mechanism. The press blank grabbing mechanism is arranged in the box filling box casing and grabs the press blank on the conveyer belt and puts it into the sintering material box on the material box moving device.

[0006] In an embodiment of the utility model, the boxing box further comprises a compacted body grabbing mechanism, a vision system and a controller; the compacted body grabbing mechanism and the vision system move according to the program set by the controller; the vision system guides the compacted body grabbing mechanism to grab the compacted body and automatically put the compacted body into the set position of the sintering box according to the program.

[0007] In a preferred embodiment of the utility model, a mechanical hand and a vision system are arranged in the boxing box; the mechanical hand is hung above the conveying belt; the mechanical hand automatically finds the compacted body on the conveying belt through the vision system and automatically puts the compacted body into the set position of the sintering box.

[0008] A glove is arranged on the housing of the boxing box, and an operator can put the compacted body on the conveying belt into the sintering box through the glove.

[0009] After the boxing box and the conveying box are butted, the second isolation valve and the third isolation valve are opened, the box moving device moves into the conveying box, and through the cooperation of the box moving device and the box holding lifting device, the multilayer sintering boxes on the box holding lifting device can be moved to the box moving device layer by layer; the box moving device moves back to the boxing box with the sintering boxes, and after the empty sintering boxes in the boxing box are filled with compacted bodies, the sintering boxes move to the conveying box again; through the multiple operations of the box moving device and the box holding lifting device, the compacted bodies are filled into the sintering boxes, and the multilayer sintering boxes are stacked; after the second isolation valve and the third isolation valve are closed, the conveying box loaded with the multilayer sintering boxes can move away from the boxing box.

[0010] After the conveying box loaded with the multilayer sintering boxes is separated from the boxing box, the conveying box is moved to the opposite side of the vacuum sintering furnace and butts against the vacuum sintering furnace, the first isolation valve and the second isolation valve are opened, the multilayer sintering boxes in the conveying box are conveyed into the vacuum sintering furnace, then the first isolation valve and the second isolation valve are closed, and the conveying box is separated from the vacuum sintering furnace; before the boxing box and the conveying box are separated, the second isolation valve and the third isolation valve are closed to ensure that the boxing box and the conveying box are both sealed and do not leak air; before the conveying box and the vacuum sintering furnace are separated, the first isolation valve and the second isolation valve are closed to isolate the atmosphere in the conveying box and the vacuum sintering furnace from the atmosphere. After the vacuum sintering process of the vacuum sintering furnace is completed, the conveying box and the vacuum sintering furnace are butted again, the first isolation valve and the second isolation valve are opened, the sintering boxes loaded with sintered blanks are conveyed into the conveying box, then the first isolation valve and the second isolation valve are closed, and the conveying box and the vacuum sintering furnace are separated.

[0011] In the rare earth permanent magnet intelligent production line, the magnetic field forming and vacuum sintering are automatically completed under nitrogen protection or vacuum condition to produce rare earth permanent magnet sintered blanks.

[0012] The rare earth permanent magnet intelligent production line further comprises a discharging mechanism, which is also arranged side by side with the vacuum sintering furnace; the conveying box can be moved horizontally to the opposite side of the discharging mechanism, and then be driven by the longitudinal moving device to be connected with the discharging mechanism; after the connection, the second isolation valve is opened, and the sintering box in the conveying box can be conveyed to the discharging mechanism, or the sintering box on the discharging mechanism is conveyed to the conveying box.

[0013] The discharging mechanism comprises a box taking device, a fixed transfer assembly, a moving roller assembly and a fixed roller assembly; the box taking device is arranged on the fixed transfer assembly, and a conveying roller is further arranged on the fixed transfer assembly; the conveying box is moved horizontally to the opposite side of the discharging mechanism, and is connected with the discharging mechanism through longitudinal movement; after the connection, the second isolation valve is opened, the box taking device enters the conveying box to take out the sintering box and then places the sintering box on the conveying roller of the fixed transfer assembly, and the conveying roller of the fixed transfer assembly conveys the sintering box to the moving roller assembly; the moving roller assembly is first connected with a group of fixed roller assemblies to convey the sintering box to the group of fixed roller assemblies, and then the moving roller assembly is connected with another group of fixed roller assemblies carrying empty sintering boxes to convey the empty sintering boxes to the moving roller assembly, and then the empty sintering boxes are conveyed to the conveying box through the moving roller assembly and the box taking device.

[0014] The sealed magnetic field press comprises a powder storage device, a powder loading device, a powder loading box, a press frame, a magnetic field forming device and a transfer mechanism; the magnetic field forming device comprises an upper press head assembly, a mold device, a lower press head assembly and an electromagnetic orientation magnetic pole; the powder storage device is located above the powder loading box; the powder loading device is arranged inside the powder loading box; the neodymium iron boron alloy powder in the powder storage device is quantitatively loaded into the mold cavity of the mold device through the powder loading device; the upper press head assembly, the mold device, the lower press head assembly and the electromagnetic orientation magnetic pole are arranged in the press frame; the upper press head assembly and the lower press head assembly are arranged above and below the mold device respectively; the electromagnetic orientation magnetic pole has two, which are respectively located on the two sides of the mold device; the mold device, together with the upper press head assembly, the lower press head assembly and the electromagnetic orientation magnetic pole, realizes bidirectional pressing of the powder in the mold cavity under magnetic field orientation, and presses the powder into a green compact; one side of the press frame is connected with the powder loading box, and the other side is connected with a green compact conveying device; the transfer mechanism transfers the green compact ejected from the mold cavity to the conveying belt. The sealed magnetic field press further comprises an electromagnetic orientation coil, which is sleeved outside the electromagnetic orientation magnetic pole.

[0015] A sensor for detecting whether there is a green compact at the position is arranged near the interface between the sealed magnetic field press and the conveying device shell, and the sensor is used to control the green compacts pressed by different sealed magnetic field presses from colliding with each other.

[0016] In a preferred embodiment, the rare earth permanent magnet intelligent production line comprises four or more sealed magnetic field presses and four or more vacuum sintering furnaces.

[0017] The green compact grabbing mechanism and the box moving device are arranged in the box loading box shell; the green compact grabbing mechanism grabs the green compact conveyed into the box loading box shell and places it into the sintering box on the box moving device.

[0018] The box loading box shell is provided with gloves, and the operator places the green compact on the conveying belt into the sintering box under the condition of being isolated from the atmosphere through the gloves.

[0019] In an embodiment of the present application, the sealed magnetic field press can move relative to the green compact conveying device. In a more preferred embodiment, the lower part of the sealed magnetic field press has wheels. When the sealed magnetic field press needs to be maintained, the connection with the green compact conveying device can be released, and then the sealed magnetic field press moves away from the green compact conveying device; when the sealed magnetic field press needs to restore the working state after the maintenance is completed, the sealed magnetic field press moves towards the green compact conveying device and restores the connection with the green compact conveying device. The movement mode of the sealed magnetic field press is selected from at least one of the wheel type movement and the sliding rail movement. The maintenance of the sealed magnetic field press includes replacing the mold, repairing and other work. During the operation of the magnetic field press, a small amount of alloy powder may be attached and stored in the press frame and the powder loading box, which needs to be cleaned regularly to avoid combustion and accidents when exposed to the atmosphere. The green compact conveying device serves as a public conveying channel of the sealed magnetic field press, conveying the green compact pressed by each sealed magnetic field press into the box loading box. Even if a sealed magnetic field press is maintained or restored to the working state after the maintenance, it does not affect the air tightness of the green compact conveying device, and it can still provide automatic conveying of green compact for other sealed magnetic field presses as a public conveying channel, ensuring the normal operation of the rare earth permanent magnet intelligent production line.

[0020] In a preferred embodiment, a press isolation door is arranged at the interface connected with the sealed magnetic field press on the green compact conveying device; when the sealed magnetic field press is disconnected from the green compact conveying device, the press isolation door needs to be closed first to seal the green compact conveying device without air leakage, and the atmosphere of the sealed space formed by the green compact conveying device, the box loading box and the sealed magnetic field press in the working state is continuously maintained.

[0021] After the box loading box and the conveying box are docked, the reciprocating movement of the box moving device of the box loading box and the lifting of the box lifting device in the conveying box are combined with the action of the green compact grabbing mechanism to automatically complete the process of loading the green compact into the sintering box and automatically stacking the sintering box.

[0022] After the boxing box and the conveying box are butted, the second isolation valve and the third isolation valve are opened, the material box moving device moves into the conveying box, through the cooperation of the material box moving device and the material box lifting device, the multiple layers of sintering material boxes on the material box lifting device can be moved layer by layer to the material box moving device; then, the material box moving device moves back to the boxing box with the sintering material boxes, and after the empty sintering material boxes in the boxing box are filled with green compacts, the green compacts are moved to the conveying box; through the multiple operations of the material box moving device and the material box lifting device, the green compacts are filled into the sintering material boxes, and the multiple layers of sintering material boxes are stacked; then, the second isolation valve and the third isolation valve are closed, and the conveying box loaded with the multiple layers of sintering material boxes can move away from the boxing box.

[0023] In the preferred embodiment of the utility model, the conveying box further comprises a material bed; the sintering material boxes in the conveying shell are multiple, arranged in n layers from top to bottom and placed on the material bed, and n>=3. The process of filling the green compacts into the sintering material boxes and automatically stacking the sintering material boxes comprises the following steps: after the boxing box and the conveying box are butted, the material box lifting device lifts all the n layers of empty sintering material boxes from the material bed, the material box moving device moves horizontally from the boxing box into the conveying shell, then the material box lifting device lowers the n layers of empty sintering material boxes onto the material box moving device, the material box lifting device lifts (n-1) layers of empty sintering material boxes, the material box moving device moves the remaining 1 layer of empty sintering material boxes from the conveying shell to the boxing box, then the material box moving device moves up and down, fills the green compacts into the sintering material boxes in the boxing box, then the material box moving device moves the sintering material boxes filled with the green compacts horizontally into the conveying shell, then the material box lifting device lowers (n-1) layers of empty sintering material boxes above the layer of sintering material boxes on the material box moving device, the material box lifting device lifts (n-2) layers of empty sintering material boxes, the material box moving device moves 2 layers of sintering material boxes including 1 layer of empty sintering material boxes from the conveying shell to the boxing box, fills the green compacts into the empty sintering material boxes in the boxing box, and the like, until the n layers of empty sintering material boxes are all filled with the green compacts in the boxing box and then moved to the conveying shell, then the material box lifting device lifts the n layers of sintering material boxes filled with the green compacts from the material box moving device, the material box moving device returns to the boxing box, and the material box lifting device lowers the n layers of sintering material boxes to the material bed.

[0024] The vacuum sintering furnace in the rare earth permanent magnet intelligent production line comprises a furnace shell, a material moving device, a first isolation valve, a heating chamber and a vacuum system; the first isolation valve is connected with the front flange of the furnace shell; and the heating chamber is arranged in the furnace shell. A heater is arranged in the heating chamber.

[0025] In a more preferred embodiment, the heating chamber comprises a movable base plate assembly; the base plate assembly comprises a sintering box support, a heat shield and a base plate shell, and a roller is arranged on the base plate shell, and the base plate assembly can move along the track on the inner wall of the furnace shell through the roller; the material moving device comprises a moving rod, a sealing assembly and a transmission device, the transmission device is arranged outside the furnace shell, the sealing assembly is connected with the furnace shell, and the transmission device drives the moving rod to pass through the sealing assembly into the inside of the furnace shell; the moving rod is connected with the base plate assembly to drive the base plate assembly to move. The sintering box is supported on the sintering box support and moves with the base plate assembly. The base plate assembly further comprises a heater arranged on the heat shield; the moving rod of the material moving device has two, and the inside of the moving rod is provided with an electrode for supplying power to the heater.

[0026] The vacuum sintering furnace further comprises an air cooling heat exchange system and an air charging system; the air cooling heat exchange system is arranged at the back of the furnace shell, and the air inlet pipe of the air cooling heat exchange system is connected with the furnace shell; the air cooling heat exchange system comprises a cooling fan and a heat exchanger; the air charging system comprises an air charging valve; after heating is completed, the air charging valve is opened to charge the protective gas into the vacuum sintering furnace, and the cooling fan is started when the pressure in the furnace reaches the set value.

[0027] In a preferred embodiment, the vacuum sintering furnace has a horizontal structure, the furnace shell is provided with a water cooling jacket, and the vacuum sintering furnace further comprises a cooling system for providing cooling to the furnace shell.

[0028] The heating chamber further comprises two side plate assemblies arranged at the left and right sides of the heating chamber respectively; the air outlet pipe of the air cooling heat exchange system is divided into two pipelines before penetrating into the furnace shell, and a valve is arranged on each pipeline, and the pipelines penetrate through the furnace shell and are connected with the two side plate assemblies of the heating chamber respectively; the side plate assembly comprises a side plate shell, a heat shield and a nozzle; the nozzle is fixed on the side plate shell and extends into the inside of the heating chamber through the heat shield of the side plate assembly; the two valves are opened and closed simultaneously or alternately. The outside of the side plate assembly is provided with a pipeline which is communicated with the nozzle and the pipeline, and the gas flowing out of the air outlet pipe of the air cooling heat exchange system is sprayed into the inside of the heating chamber through the nozzle.

[0029] The heating chamber further comprises a front cover assembly and an upper plate assembly.

[0030] After the first isolation valve is opened, the base plate assembly can move to the outside of the vacuum sintering furnace; a movable material feeding box is arranged outside the vacuum sintering furnace; the vacuum sintering furnace can be docked with the material feeding box arranged outside the vacuum sintering furnace through the first isolation valve; after the vacuum sintering furnace is docked with the material feeding box, the base plate assembly moves into the material feeding box to carry the sintering box in the material feeding box which holds the pressed blank, and then returns to the vacuum sintering furnace with the sintering box, then the material feeding box and the vacuum sintering furnace are separated, and the vacuum sintering process is carried out in the vacuum sintering furnace.

[0031] After the vacuum sintering process, the vacuum sintering furnace is connected with the conveying box, the sintering material box loaded with the sintering blank is conveyed from the vacuum sintering furnace to the conveying box through the bottom plate assembly; before and after the vacuum sintering furnace is connected with the conveying box, the atmosphere in the conveying box and the vacuum sintering furnace is kept isolated from the atmosphere.

[0032] In an embodiment of the present application, the vacuum system of the vacuum sintering furnace comprises a mechanical vacuum pump directly connected with the atmosphere and a Roots vacuum pump for further improving the vacuum degree in the furnace.

[0033] Although some automatic press systems have appeared in the industry, in which multiple presses are connected in series through a channel, a mechanical arm is arranged in each press to take and load the material into a box, and then the material box is transferred in the channel through multiple trolleys, the number of the mechanical arms and trolleys is large, the structure and action are complex and redundant, in addition, the loading action in each press also requires a set of empty material box conveying device to be equipped in each press, and the complicated empty material box conveying action is performed, the above design not only increases the system equipment cost, more importantly, reduces the operation efficiency of the whole system, increases the failure rate, and affects the production efficiency.

[0034] The end of the press system in some forms is also directly connected with the vacuum sintering furnace through a plug valve, although the function of sending the material box containing the pressed blank into the vacuum sintering furnace is realized, but the fixed connection with the vacuum sintering furnace has a big problem: the vacuum sintering process time of the vacuum sintering furnace is relatively long, much longer than the speed rhythm of the pressed blank provided by the multiple presses, so that the press system needs to stop after providing a furnace of pressed blank to wait for the fixed vacuum sintering furnace to complete the vacuum sintering process, which is contrary to the original design of the press system composed of multiple presses, and makes the system lose its original meaning. Some press equipment transfers the material to a mobile conveying device, but the mobile conveying device cannot be directly connected with the vacuum sintering furnace, but the mobile conveying device first transfers the material to a transition glove box, and then the glove box transfers the material to the vacuum sintering furnace, which does not have true process continuity. In the press system composed of the pressed blank conveying device, the boxing box and the multiple sealed magnetic field presses in the utility model, the boxing box at the end of the system is freely connected with the movable material conveying box, and then one material conveying box is freely connected with multiple vacuum sintering furnaces. This design makes the process rhythm of the press and the vacuum sintering furnace flexible and adaptive, and can flexibly arrange the rare earth permanent magnet production, and improves the working efficiency of the whole rare earth permanent magnet intelligent production line.

[0035] In an embodiment of the utility model, the rare earth permanent magnet intelligent production line further includes a first glove box, a second glove box and a discharge box, the other end of the pressed blank conveying shell is connected with the first glove box, the first glove box includes a first glove box body and a fourth isolation valve, and the fourth isolation valve is arranged at the end of the first glove box body; one side of the boxing box is connected with the second glove box through a glove box interface, the second glove box includes a second glove box body and a fifth isolation valve, and the fifth isolation valve is arranged at the end of the second glove box body.

[0036] In an embodiment, the discharge box can be moved and can be connected with the first glove box and the second glove box respectively. After the rare earth alloy powder is pressed into a pressed blank by the sealed magnetic field press, the pressed blank is conveyed to a conveying belt arranged in the pressed blank conveying device, and the pressed blank is conveyed to the first glove box through the conveying belt, and the pressed blank is conveyed to the discharge box connected with the first glove box through the first glove box; then, the discharge box is separated from the first glove box and carries the pressed blank to carry out the first process treatment; the discharge box carries the pressed blank after the first process treatment and is connected with the second glove box, and the pressed blank is conveyed to the second glove box; the pressed blank enters the boxing box through the second glove box, and is boxed through the pressed blank grabbing mechanism.

[0037] In another embodiment, the discharge box is fixedly connected to the other side of the fourth isolation valve, and a feeding box is arranged on the other side of the fifth isolation valve; the operator packs the pressed blank on the conveying belt in the first glove box through the gloves on the first glove box, and then the pressed blank is moved into the discharge box, and then the pressed blank is moved out of the discharge box by the moving means for first process treatment; after the first process treatment is completed, the pressed blank is moved into the feeding box by the moving means, and then the pressed blank is moved from the feeding box to the second glove box; the operator removes the packaging of the pressed blank through the gloves on the second glove box and then places the pressed blank on the conveying belt, so that the pressed blank is sent to the boxing box through the conveying belt for boxing. Then, the movable feeding box is respectively connected with the boxing box and the vacuum sintering furnace, and the sintering box containing the pressed blank is transferred from the boxing box to the vacuum sintering furnace for vacuum sintering. The first process treatment includes but is not limited to the isostatic pressing process.

[0038] The rare earth permanent magnet intelligent production line of the utility model is under nitrogen protection or vacuum condition from alloy powder to sintering blank, and the magnetic field forming and vacuum sintering of the rare earth permanent magnet material process are automatically completed, so that the rare earth permanent magnet raw material which is easy to be oxidized is effectively isolated from the atmospheric environment, the oxygen content in the material is reduced, the performance of the rare earth permanent magnet material is further improved, the material preparation, placing and boxing, furnace loading, material conveying between processes and sintering blank discharging and material taking are all completed in an automatic mode, the production efficiency is improved, the human resources are saved, the production cost is reduced, the uncertainty of manual operation is eliminated, the product failure rate is reduced, and the product quality stability is improved. Under the condition that the raw material composition and the manufacturing process parameters are the same, the oxygen content in the rare earth permanent magnet material manufactured by the technical scheme of the utility model is reduced by about 200ppm, and the product failure rate caused in the process is reduced by about 30%.

[0039] The current vacuum sintering furnace in the industry generally uses a glove box structure, and realizes the protection of the feeding by manual operation, and most of the material forks are used to move the material from the glove box to the material bed of the vacuum sintering furnace, and the material fork of the cantilever structure will have a certain degree of shaking when the material is moved. The inventor found that in the production line, if the vacuum sintering furnace is still used, the cantilever length of the material fork will be lengthened due to the large moving stroke, which is easy to cause the shaking to be intensified, and the compacted body in the sintering box is easy to produce micro-defects in the shaking, which has a certain influence on the quality of the sintered rare earth permanent magnet material. The vacuum sintering furnace in the utility model comprises a movable bottom plate assembly, a roller is arranged on the bottom plate shell, and the bottom plate assembly can move along the track on the inner wall of the furnace shell through the roller. When the vacuum sintering furnace is connected with the material feeding box, the bottom plate assembly moves into the material feeding box to carry the sintering material box loaded with the compacted body in the material feeding box, and then returns to the vacuum sintering furnace with the sintering material box. The movable bottom plate assembly has stable transmission and overcomes the above problems.

[0040] The utility model mainly solves the following problems:

[0041] 1. The difficulty of neodymium iron boron rare earth permanent magnet production is that the rare earth permanent magnet alloy is very easy to oxidize, the powder particle size is fine, the powder cannot be granulated, the magnetic field forming is difficult, some equipment can complete the isolation from the atmosphere, but actually a large amount of nitrogen is wasted, and the oxygen content cannot be reduced, and the oxygen content in the production process of the equipment is less than 200ppm. In order to reduce the oxidation of the rare earth permanent magnet alloy powder, reduce the rare earth consumption and improve the magnetic performance, the rare earth praseodymium neodymium is partially replaced by rare earth lanthanum cerium, and the oxygen content in the production process of the equipment is less than 100ppm.

[0042] 2. The magnetic field forming property of the fine powder is realized, the coercive force is improved, and the consumption of heavy rare earth elements dysprosium and terbium is reduced. When the existing technology cancels isostatic pressing, the average particle size of the powder is generally higher than 3.5um, and when the average particle size of the powder is less than 2.8um, the sealed magnetic field pressing machine also has good magnetic field forming property, and is suitable for batch production.

[0043] 3. The powder loading device in the newly designed powder loading box uniformly loads the powder into the mold, and forms according to the set process curve, and under the condition that the isostatic pressing is cancelled, the compacted body density is greater than 4.5g / cm 3 .

[0044] 4. The compacted body conveying device changes the existing technology, and directly puts the compacted body into the conveying belt in the compacted body conveying device after taking out the compacted body from the mold, a conveying belt connects all the magnetic field pressing machines, and the compacted body is conveyed to the same box loading box, which is simple and reliable in structure, convenient to operate, low in equipment cost and high in practicability.

[0045] 5. Prior art, each press is provided with a box filling box in front of the press, and then the filled green compact is transmitted to the glove box of the vacuum sintering furnace, and the glove box is connected with the vacuum sintering furnace, the equipment is complex and easy to cause the oxygen content of the green compact to increase; in addition, this structure actually cannot be separated from human participation, and intelligent production cannot be realized. The conveying belt directly brings the green compact into the box filling box, and the green compact is filled into the sintering box by the mechanical hand with vision in the box filling box, and the conveying box is connected with the sintering furnace after the conveying box. Low oxygen content, nitrogen saving, high degree of automation.

[0046] 6. The conveying box of the prior art cannot be directly connected with the vacuum sintering furnace, and the conveying box is first transmitted to an excessive glove box, and then transmitted to the vacuum sintering furnace by the glove box. The conveying box of the utility model is connected with the box filling box, and is directly connected with the vacuum sintering furnace after the box filling box is removed. The empty sintering box is transmitted back to the box filling box through the conveying box, and intelligent operation is realized. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1 is a front view structural schematic diagram of an embodiment of the vacuum sintering furnace involved in the utility model.

[0048] Figure 2 is a top view structural schematic diagram of an embodiment of the vacuum sintering furnace involved in the utility model.

[0049] Figure 3 is a side view structural schematic diagram of an embodiment of the vacuum sintering furnace involved in the utility model.

[0050] Figure 4 is a structural layout schematic diagram of an embodiment of the rare earth permanent magnet intelligent production line in the utility model.

[0051] Figure 5 is a structural schematic diagram of an embodiment of the sealed magnetic field press of the rare earth permanent magnet intelligent production line in the utility model.

[0052] Figure 6 is a structural layout partial schematic diagram of another embodiment of the rare earth permanent magnet intelligent production line in the utility model. DETAILED DESCRIPTION

[0053] The embodiments of the utility model will be further described below in combination with the drawings.

[0054] As Figure 1 , Figure 2 and Figure 3The vacuum sintering furnace 01 comprises a furnace shell 1, a first isolation valve 2, a heating chamber 4 and a vacuum system 5; the first isolation valve 2 is connected with the front flange of the furnace shell; the heating chamber 4 is arranged in the furnace shell 1. The heating chamber 4 is provided with a heater 15.

[0055] The vacuum sintering furnace 01 further comprises a material moving device 3, and the heating chamber comprises a movable bottom plate assembly 6; the bottom plate assembly 6 comprises a sintering material box support 7, a heat shield 8 and a bottom plate shell 9, the bottom plate shell 9 is provided with a roller 10, and the bottom plate assembly 6 can move along the track 11 on the inner wall of the furnace shell through the roller 10; the material moving device 3 comprises a moving rod 12, a sealing assembly 13 and a transmission device 14, the transmission device 14 is arranged outside the furnace shell 1, the sealing assembly 13 is connected with the furnace shell 1, and the transmission device 14 drives the moving rod 12 to pass through the sealing assembly 13 and enter the inside of the furnace shell 1; the moving rod 12 is connected with the bottom plate assembly 6 and drives the bottom plate assembly 6 to move.

[0056] The bottom plate assembly 6 further comprises a heater 16, and the heater 16 is arranged on the heat shield 8; the material moving device 3 comprises two moving rods 12, and the inside of the moving rod 12 is provided with an electrode for electrifying the heater 16.

[0057] The vacuum sintering furnace 01 further comprises an air cooling heat exchange system 17 and an inflation system 18; the air cooling heat exchange system 17 is arranged at the back of the furnace shell 1, and an air inlet pipe of the air cooling heat exchange system is connected with the furnace shell 1. The air cooling heat exchange system comprises a cooling fan and a heat exchanger. The inflation system 18 comprises an inflation valve 19; after heating is completed, the inflation valve 19 is opened to inflate the protective gas into the vacuum sintering furnace, and the cooling fan is started when the pressure in the furnace reaches the set value.

[0058] The heating chamber 4 further comprises two side plate assemblies 20, which are respectively arranged at the left and right sides of the heating chamber 4; an air outlet pipe 21 of the air cooling heat exchange system is divided into two pipe lines 22 before penetrating into the furnace shell, and a valve 23 is arranged on each pipe line 22; the pipe line 22 penetrates through the furnace shell 1 and is connected with the two side plate assemblies 20 of the heating chamber respectively; the side plate assembly 20 comprises a side plate shell, a heat shield and a nozzle 24. The nozzle 24 is fixed on the side plate shell and extends to the inside of the heating chamber 4 through the heat shield of the side plate assembly 20. The two valves 23 are opened and closed simultaneously or alternately. The side plate assembly 20 is provided with a pipeline 25 on the outside, and the pipeline 25 is communicated with the nozzle 24 and the pipe line 22; the gas flowing out of the air outlet pipe 21 of the air cooling heat exchange system is sprayed into the inside of the heating chamber 4 through the nozzle 24.

[0059] The heating chamber further comprises a front cover assembly and an upper plate assembly.

[0060] In a preferred embodiment, the vacuum sintering furnace is of a horizontal structure, the furnace shell is provided with a water cooling jacket, and the vacuum sintering furnace further comprises a cooling system, and the furnace shell is cooled by the cooling system.

[0061] After the first isolation valve 2 is opened, the base plate assembly 6 can be moved to the outside of the vacuum sintering furnace 01. A movable conveyor box 26 is provided outside the vacuum sintering furnace 01, and a second isolation valve 30 is provided at one end of the conveyor box 26. The vacuum sintering furnace 01 can connect with the conveyor box 26 located outside the vacuum sintering furnace through the first isolation valve 2. After the vacuum sintering furnace 01 connects with the conveyor box 26, the first isolation valve 2 and the second isolation valve 30 are opened, and the base plate assembly 6 moves into the conveyor box 26 to carry the sintering material box 27 containing the pressed blank, and then returns the sintering material box 27 back into the vacuum sintering furnace 01. Then, the conveyor box 26 and the vacuum sintering furnace 01 separate, and the vacuum sintering furnace 01 performs the vacuum sintering process. Before the conveyor box 26 and the vacuum sintering furnace 01 separate, the first isolation valve 2 and the second isolation valve 30 are closed.

[0062] After the vacuum sintering process is completed, the vacuum sintering furnace 01 is connected to the conveying box 26, and the sintering material box 27 containing the sintered blank is transferred from the vacuum sintering furnace 01 to the conveying box 26 through the bottom plate assembly 6. Before and after the vacuum sintering furnace 01 is connected to the conveying box 26, the atmosphere in the conveying box 26 and the vacuum sintering furnace 01 is kept isolated from the atmosphere.

[0063] In one embodiment of this utility model, the vacuum system 5 of the vacuum sintering furnace includes a mechanical vacuum pump 28 that directly exhausts to the atmosphere and a Roots vacuum pump 29 that further enhances the vacuum level inside the furnace.

[0064] In a preferred embodiment of the present invention, the vacuum sintering furnace further includes a sintering material box opening device, which includes a synchronous opening adjustment device on the upper part of the furnace shell and an opening component inside the furnace shell. When the vacuum sintering furnace is working, the opening component drives the lids of the sintering material boxes loaded in the vacuum sintering furnace to open or close simultaneously. There are more than 3 layers of sintering material boxes loaded in the furnace, and each layer of sintering material boxes has more than 1 lid.

[0065] The rare earth permanent magnet intelligent production line of this utility model, such as Figure 4 As shown, the rare earth permanent magnet intelligent production line includes a sealed magnetic field press 31, a billet conveying device 32, a packaging box 33, a conveying material box 26, and a vacuum sintering furnace 01. The conveying material box 26 is filled with protective gas. In such a way... Figure 4In the shown embodiment, the rare earth permanent magnet intelligent production line comprises four vacuum sintering furnaces and four sealing magnetic field presses arranged side by side. One end of each of the sealing magnetic field presses is connected with the side of the compact conveying device 32 respectively, and one end of the compact conveying device 32 is connected with the boxing box 33. The sealing magnetic field press 31, the compact conveying device 32 and the boxing box 33 constitute a closed space, and the inside is filled with protective gas. After the rare earth alloy powder is pressed into a compact by the sealing magnetic field press 31, the compact is conveyed to the conveying belt arranged in the compact conveying device 32, and the compact is conveyed to the boxing box 33 through the conveying belt. The compact conveying device 32 serves as a common conveying channel of the sealing magnetic field presses, and conveys the compacts pressed by the sealing magnetic field presses to the boxing box 33. The boxing box is provided with a compact grabbing mechanism, and the compact grabbing mechanism grabs the compact and places it into the sintering box arranged in the boxing box.

[0066] The boxing box 33 and the vacuum sintering furnace 01 are arranged side by side, and the conveying box 26 can be moved to the opposite side of the boxing box 33 and the vacuum sintering furnace 01 respectively through transverse movement, and then the conveying box 26 is abutted with the boxing box 33 and the vacuum sintering furnace 01 respectively through longitudinal movement. One end of the boxing box 33 is provided with a third isolation valve 34. After the conveying box 26 is abutted with the boxing box 33, the second isolation valve 30 and the third isolation valve 34 are opened, the space in the conveying box 26 is communicated with the space in the boxing box 33, and then the sintering box can be moved between the boxing box 33 and the conveying box 26. Before the boxing box 33 and the conveying box 26 are separated, the second isolation valve 30 and the third isolation valve 34 are closed to ensure that the boxing box 33 and the conveying box 26 are both sealed and do not leak gas.

[0067] After the conveying box 26 carrying the sintering box with the compact is separated from the boxing box 33, the conveying box 26 is moved to the opposite side of the vacuum sintering furnace 01 and is abutted with the vacuum sintering furnace 01. After abutment, the first isolation valve 2 and the second isolation valve 30 are opened, the sintering box with the compact in the conveying box 26 is conveyed into the vacuum sintering furnace 01, and then the conveying box 26 is separated from the vacuum sintering furnace 01. Before the conveying box 26 and the vacuum sintering furnace 01 are separated, the first isolation valve 2 and the second isolation valve 30 are closed to realize that the atmosphere in the conveying box 26 and the vacuum sintering furnace 01 is isolated from the atmosphere.

[0068] After the vacuum sintering process of the vacuum sintering furnace is completed, the sintering box with the sintered compact is conveyed into the conveying box through the abutment of the conveying box and the vacuum sintering furnace, and then the conveying box and the vacuum sintering furnace are separated. In the rare earth permanent magnet intelligent production line, the magnetic field forming and vacuum sintering are automatically realized under the nitrogen protection or vacuum condition to produce the rare earth permanent magnet sintered compact.

[0069] The rare earth permanent magnet intelligent production line further comprises a discharging mechanism 35, which is arranged side by side with the boxing box 33 and the vacuum sintering furnace 01. The conveying box 26 can be moved transversely to the opposite side of the discharging mechanism 35, and then moved longitudinally to be connected with the discharging mechanism 35. After the connection, the second isolation valve 30 is opened, and the sintering box in the conveying box 26 can be conveyed to the discharging mechanism 35, or the sintering box on the discharging mechanism 35 is conveyed to the conveying box 26.

[0070] As shown in Figure 5 , the sealed magnetic field press 31 comprises a powder storage device 36, a powder loading device 37, a powder loading box 38, a press frame 39, an upper press head assembly 40, a mold device 41, a lower press head assembly 42 and an electromagnetic orientation magnetic pole 43. The powder storage device 36 is located above the powder loading box 38. The powder loading device 37 is arranged inside the powder loading box 38. The Nd-Fe-B alloy powder in the powder storage device 36 is quantitatively loaded into the mold cavity of the mold device 41 through the powder loading device 37. The upper press head assembly 40, the mold device 41, the lower press head assembly 42 and the electromagnetic orientation magnetic pole 43 are arranged in the press frame 39. The upper press head assembly 40 and the lower press head assembly 42 are arranged above and below the mold device 41, respectively. The electromagnetic orientation magnetic pole 43 has two, which are located on both sides of the mold device 41. One side of the press frame 39 is connected with the powder loading box 38, and the other side is connected with the compact conveying device 32. The conveying belt 44 is arranged in the compact conveying device 32.

[0071] The mold device, together with the upper press head assembly, the lower press head assembly and the electromagnetic orientation magnetic pole, realizes bidirectional pressing of the powder in the mold cavity under magnetic field orientation, and presses the powder into a compact. After the compact is ejected from the mold cavity, it is conveyed to the conveying belt.

[0072] The sealed magnetic field press is further provided with an electromagnetic orientation coil, which is sleeved outside the electromagnetic orientation magnetic pole.

[0073] In the embodiment shown in Figure 5 , the lower part of the press frame 39 has a wheel 45, which can move along the axis formed by the powder loading box 38, the press frame 39 and the compact conveying device 32. The lower part of the powder loading box 38 is also provided with a wheel 46, which can also move. The press isolation door 47 is arranged at the interface connected with the sealed magnetic field press 31 on the compact conveying device 32.

[0074] When the sealed magnetic field press needs to be maintained, the press frame can be disconnected from the compacted blank conveying device, and then the press frame and the powder loading box are moved away from the compacted blank conveying device; when the sealed magnetic field press needs to resume the working state after the maintenance is completed, the press frame and the powder loading box are moved to the compacted blank conveying device, and the connection between the press frame and the compacted blank conveying device is restored. When the sealed magnetic field press is disconnected from the compacted blank conveying device, the press isolation door needs to be closed first, so that the compacted blank conveying device is sealed and does not leak air, and the atmosphere of the sealed space formed by the compacted blank conveying device, the box loading box and the sealed magnetic field press in the working state is continuously maintained. The maintenance of the sealed magnetic field press includes replacement of the mold, repair and other work.

[0075] The compacted blank conveying device serves as a common conveying channel of the sealed magnetic field press, and conveys the compacted blanks pressed by each sealed magnetic field press to the box loading box. Even if a sealed magnetic field press is maintained or resumes the working state after the maintenance, the air tightness of the compacted blank conveying device is not affected, and the compacted blank conveying device can still serve as a common conveying channel to provide automatic conveying of compacted blanks for other sealed magnetic field presses, and ensure normal operation of the rare earth permanent magnet intelligent production line.

[0076] The compacted blank conveying device comprises a compacted blank conveying shell; one end of the compacted blank conveying shell is connected with the box loading box, and the side surface is connected with the sealed magnetic field press; a sensor for detecting whether there is a compacted blank at the position is arranged near the interface between the sealed magnetic field press and the compacted blank conveying shell, and the sensor is used to control the compacted blanks pressed by different sealed magnetic field presses from colliding with each other.

[0077] The box loading box comprises a box loading box shell and a material box moving device; one end of the box loading box shell is connected with the third isolation valve, and the side surface is connected with the compacted blank conveying device; a conveying belt in the compacted blank conveying device extends into the box loading box shell; the compacted blank grabbing mechanism and the material box moving device are arranged in the box loading box shell; the compacted blank grabbing mechanism grabs the compacted blank conveyed into the box loading box shell and puts it into the sintering material box on the material box moving device; after the box loading box and the conveying material box are docked, the material box moving device can move reciprocally in the box loading box and the conveying material box. The material box moving device can move horizontally or vertically.

[0078] The discharging mechanism comprises a box taking device, a fixed transfer assembly, a moving roller assembly and a fixed roller assembly; the box taking device is arranged on the fixed transfer assembly, and a transfer roller is further arranged on the fixed transfer assembly; the transfer box is moved transversely to the opposite side of the discharging mechanism, and is connected to the discharging mechanism through longitudinal movement; after the connection, the second isolation valve is opened, and the box taking device can reciprocate between the transfer box and the discharging mechanism; the moving roller assembly is connected to the fixed transfer assembly or a plurality of fixed roller assemblies; during operation, the box taking device takes out the sintering box from the transfer box and places it on the transfer roller of the fixed transfer assembly, and the transfer roller of the fixed transfer assembly further transfers the sintering box to the moving roller assembly; the moving roller assembly is first connected to a group of fixed roller assemblies, and then is connected to another group of fixed roller assemblies carrying empty sintering boxes, so as to transfer the empty sintering boxes to the moving roller assembly; then, the empty sintering boxes are transferred to the transfer box through the moving roller assembly and the box taking device.

[0079] As shown in Figure 3 The transfer box 26 comprises a transfer box shell 48, a box lifting device 49, a longitudinal moving device 50 and a transverse moving device 51; the transfer box 26 can move transversely under the drive of the transverse moving device 51; the second isolation valve 30 is connected to the transfer box shell 48; the transfer box shell 48 is installed on the guide rail 52 in the transverse moving device 51, and the transfer box shell 48 together with the second isolation valve 30 can move longitudinally along the guide rail 52 in the transverse moving device 51 under the drive of the longitudinal moving device 50, so as to realize the connection between the transfer box and the box loading box or the vacuum sintering furnace.

[0080] After the connection between the box loading box and the transfer box, the reciprocating movement of the box moving device of the box loading box and the lifting of the box lifting device in the transfer box are combined with the action of the compact pressing and grabbing mechanism, so as to automatically load the compact into the sintering box and automatically stack the sintering boxes.

[0081] As shown in Figure 6As shown, in another embodiment of the present application, the rare earth permanent magnet intelligent production line further comprises a first glove box 53, a second glove box 54 and a discharge box 55, one end of the green compact conveying device 32 is connected with the first glove box 53, the first glove box 53 comprises a first glove box body and a fourth isolation valve 56; one side of the boxing box 33 is connected with the second glove box 54 through a glove box interface, and the second glove box 54 comprises a second glove box body and a fifth isolation valve 57. By moving the discharge box 55, the discharge box 55 can be connected with the first glove box 53 and the second glove box 54 respectively. After the rare earth alloy powder is pressed into a green compact by the sealed magnetic field pressing machine 31, the green compact is conveyed to a conveying belt arranged in the green compact conveying device 32, and the green compact is conveyed into the first glove box 53 through the conveying belt; then, the discharge box 55 is separated from the first glove box 53, and the green compact is carried to the first process treatment; the discharge box 55 carries the green compact after the first process treatment and is connected with the second glove box 54, and the green compact is conveyed into the second glove box 54; the green compact enters the boxing box 33 through the second glove box 54, and is boxed through the green compact grabbing mechanism. Then, the movable conveying box 26 is connected with the boxing box 33 and the vacuum sintering furnace 01 respectively, and the sintering box containing the green compact is transferred from the boxing box 33 to the vacuum sintering furnace 01 for vacuum sintering.

[0082] In another embodiment, the discharge box is fixedly connected to the other side of the fourth isolation valve, and a feeding box is further arranged on the other side of the fifth isolation valve; the operator packs the green compact on the conveying belt in the first glove box through the gloves on the first glove box, then the green compact is moved into the discharge box, and then the green compact is moved out of the discharge box through the moving means for the first process treatment; after the first process treatment is completed, the green compact is moved into the feeding box through the moving means, and then the green compact is moved from the feeding box to the second glove box, and the operator removes the packaging of the green compact through the gloves of the second glove box and puts the green compact on the conveying belt, so that the green compact is sent to the boxing box through the conveying belt for boxing.

Claims

1. A rare earth permanent magnet intelligent production line, characterized in that: The application relates to a sealing magnetic field press, a compacted body conveying device, a boxing box, a conveying box and a vacuum sintering furnace; the sealing magnetic field press is arranged in parallel and comprises two or more sealing magnetic field presses; the compacted body conveying device comprises a compacted body conveying shell and a conveying belt; one end of each sealing magnetic field press is connected to the side of the compacted body conveying shell; the boxing box comprises a boxing box shell, a box moving device and a third isolation valve; one end of the boxing box shell is provided with the third isolation valve; one end of the compacted body conveying shell is connected to the boxing box shell; the conveying belt extends into the boxing box shell; the box moving device can move horizontally and vertically; the sealing magnetic field press, the compacted body conveying device and the boxing box form a closed space isolated from the atmosphere, and the closed space is filled with protective gas; the sealing magnetic field press comprises a powder loading device, a magnetic field forming device and a press frame; the conveying box comprises a conveying box shell, a box holding lifting device, a longitudinal moving device, a transverse moving device and a second isolation valve; the second isolation valve is connected to the conveying box shell; the conveying box shell is installed on the transverse moving device; the longitudinal moving device drives the conveying box shell and the second isolation valve to move on the transverse moving device; the conveying box is one or more; the vacuum sintering furnace is two or more and arranged in parallel; one end of the vacuum sintering furnace is provided with a first isolation valve; the conveying box can be moved to the opposite side of the boxing box and the vacuum sintering furnace and is connected to the boxing box and the vacuum sintering furnace respectively.

2. The rare earth permanent magnetic intelligent production line according to claim 1, characterized in that: The boxing box further comprises a compacted body grabbing device; the compacted body grabbing device is arranged in the boxing box shell; the compacted body grabbing device grabs the compacted body on the conveying belt and puts the compacted body into the sintering box on the box moving device.

3. The rare earth permanent magnetic intelligent production line according to claim 1, characterized in that: The boxing box further comprises a compacted body grabbing device, a visual system and a controller; the box moving device and the compacted body grabbing device move according to the program set by the controller; the visual system guides the compacted body grabbing device to grab the compacted body and automatically puts the compacted body into the set position of the sintering box according to the program.

4. The rare earth permanent magnetic intelligent production line according to claim 1, characterized in that: A mechanical hand and a visual system are arranged in the boxing box; the mechanical hand is hung above the conveying belt; the mechanical hand automatically finds the compacted body on the conveying belt through the visual system and automatically puts the compacted body into the set position of the sintering box.

5. The rare earth permanent magnetic intelligent production line according to claim 1, characterized in that: A glove is arranged on the boxing box shell; an operator can put the compacted body on the conveying belt into the sintering box through the glove.

6. The rare earth permanent magnetic intelligent production line according to claim 1, characterized in that: After the boxing box and the conveying box are connected, the second isolation valve and the third isolation valve are opened; the box moving device is moved into the conveying box; through the cooperation of the box moving device and the box holding lifting device, the multilayer sintering box on the box holding lifting device can be moved to the box moving device layer by layer; the box moving device moves back to the boxing box with the sintering box; after the empty sintering box in the boxing box is filled with the compacted body, the sintering box is moved to the conveying box; through the multiple operations of the box moving device and the box holding lifting device, the compacted body is filled into the sintering box and the multilayer sintering box is stacked; after the second isolation valve and the third isolation valve are closed, the conveying box loaded with the multilayer sintering box can be moved away from the boxing box.

7. The rare earth permanent magnetic smart production line according to claim 6, characterized in that: The material conveying box loaded with the multilayer sintering material box with the pressed blank moves to the opposite side of the vacuum sintering furnace and is connected with the vacuum sintering furnace, the first isolation valve and the second isolation valve are opened, the multilayer sintering material box in the material conveying box is conveyed into the vacuum sintering furnace, then the first isolation valve and the second isolation valve are closed, the material conveying box is separated from the vacuum sintering furnace; after the vacuum sintering process of the vacuum sintering furnace is completed, the material conveying box and the vacuum sintering furnace are connected again, the first isolation valve and the second isolation valve are opened, the sintering material box loaded with the sintered blank is conveyed from the vacuum sintering furnace into the material conveying box, then the first isolation valve and the second isolation valve are closed, and the material conveying box is separated from the vacuum sintering furnace.

8. The rare earth permanent magnetic intelligent production line according to claim 1, characterized in that: The vacuum sintering furnace comprises a furnace shell, a material moving device, a heating chamber and a vacuum system; the first isolation valve is connected with the front flange of the furnace shell; the heating chamber is arranged in the furnace shell and comprises a movable bottom plate assembly; the bottom plate assembly comprises a sintering material box support, a heat shield and a bottom plate shell, rollers are arranged on the bottom plate shell, and the bottom plate assembly can move along the track on the inner wall of the furnace shell through the rollers; the material moving device comprises a moving rod, a sealing assembly and a transmission device; the transmission device is arranged outside the furnace shell; the transmission device drives the moving rod to pass through the sealing assembly and enter the inside of the furnace shell; the moving rod is connected with the bottom plate assembly and drives the bottom plate assembly to move; the sintering material box is supported on the sintering material box support and moves with the bottom plate assembly.

9. The rare earth permanent magnetic intelligent production line according to claim 1, characterized in that: The rare earth permanent magnet intelligent production line further comprises a discharging mechanism; the discharging mechanism is also arranged side by side with the vacuum sintering furnace; the material conveying box can move horizontally to the opposite side of the discharging mechanism and is connected with the discharging mechanism through the longitudinal moving device; after being connected, the second isolation valve is opened, and the sintering material box in the material conveying box can be conveyed onto the discharging mechanism or the sintering material box on the discharging mechanism is conveyed into the material conveying box.

10. The rare earth permanent magnetic intelligent production line according to claim 9, characterized in that: The discharging mechanism comprises a box taking device, a fixed transfer assembly, a moving roller assembly and a fixed roller assembly; the box taking device is arranged on the fixed transfer assembly, and a conveying roller is further arranged on the fixed transfer assembly; the material conveying box moves horizontally to the opposite side of the discharging mechanism, is connected with the discharging mechanism through the longitudinal moving, after being connected, the second isolation valve is opened, the box taking device takes out the sintering material box from the material conveying box and places the sintering material box on the conveying roller of the fixed transfer assembly, and the conveying roller of the fixed transfer assembly conveys the sintering material box to the moving roller assembly; the moving roller assembly is first connected with a group of fixed roller assemblies, conveys the sintering material box to the group of fixed roller assemblies, moves the moving roller assembly to be connected with another group of fixed roller assemblies loaded with empty sintering material boxes, conveys the empty sintering material boxes to the moving roller assembly, and then conveys the empty sintering material boxes into the material conveying box through the moving roller assembly and the box taking device.

11. The rare earth permanent magnetic smart production line according to claim 1, characterized in that: The rare earth permanent magnet intelligent production line comprises four or more sealed magnetic field presses and four or more vacuum sintering furnaces.

12. The rare earth permanent magnetic smart production line according to claim 1, characterized in that: The sealed magnetic field press is provided with wheels at the lower part and can move relative to the pressed blank conveying device.

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