A continuous vacuum sintering system for NdFeB magnets

Abstract

The present invention discloses a continuous vacuum sintering system for NdFeB magnets, which also includes multiple groups of mobile components for carrying NdFeB magnets and auxiliary units placed on both sides of the sintering cylinder, and each group of auxiliary units includes an upper cover, a lower cover, a telescopic cylinder and a lifting assembly, the upper cover and the lower cover are connected by the lifting assembly, and the outer sleeve of the telescopic cylinder is provided with a column; the inner cavity of the sintering cylinder and the upper cover and the lower cover constitutes a transverse channel in which the mobile component can slide, and the mobile component includes a hanger and two sealing seats, and the two ends of the hanger are fixedly connected to the two sealing seats through multiple connectors; the outer periphery of the two seals forms a sliding seal with the inner wall of the upper cover and the lower cover, and the inner wall of the sintering cylinder; the telescopic cylinder is arranged horizontally, and the output end is fixedly connected to the outer side of the sealing seat to realize the driving of the mobile component. The present invention can continuously realize the loading and unloading, sintering and cooling process of NdFeB magnets, can meet the needs of continuous sintering operations, and improve production efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of sintering equipment, in particular to a continuous vacuum sintering system for NdFeB magnets. Background Art

[0002] NdFeB magnetic material is a tetragonal crystal formed by neodymium, iron and boron. It is widely used to prepare NdFeB magnets, which in turn are widely used in electronic products such as hard disks, mobile phones, headphones and battery-powered tools. During production, NdFeB is mixed to form a powder, which is then formed into a block by a pressurizing device and then sintered by a heating device.

[0003] Existing sintering processes mostly use vacuum sintering furnaces. For example, the utility model patent with announcement number CN217953109U discloses a vacuum sintering device for high coercive force NdFeB magnets, and the invention patent with announcement number CN116608679A discloses a vacuum sintering device for processing NdFeB magnetic materials. In the above two patented technologies, a closed furnace body is used to sinter the NdFeB magnets. During sintering, the NdFeB magnets are placed inside the furnace body, and then the furnace body is sealed and vacuumed for heating and sintering. After the materials are discharged, the furnace body needs to be vacuumed again, which prolongs the production cycle of the entire process and results in low sintering efficiency. The furnace body cannot meet the production requirements of modular design, high integration, and deployment of continuous operations. Summary of the invention

[0004] The purpose of the present invention is to provide a continuous vacuum sintering system for NdFeB magnets to solve the problems in the above background technology that the sintering efficiency is low and the furnace body cannot meet the production requirements of modular design, high integration and continuous operation.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A continuous vacuum sintering system for NdFeB magnets, comprising: at least one sintering cylinder and a base, wherein the sintering cylinder is horizontally fixedly mounted on the base, the sintering cylinder is composed of a heat insulation layer and a uniform heating layer, a heating unit is fixedly mounted in the base, and an output end of the heating unit is fixedly embedded in the uniform heating layer;

[0007] It also includes multiple groups of moving components for carrying NdFeB magnets and auxiliary units placed on both sides of the sintering cylinder, and each group of auxiliary units includes an upper cover body, a lower cover body, a telescopic cylinder and a lifting component, the upper cover body and the lower cover body are connected by the lifting component, and the outside of the telescopic cylinder is sleeved with a column; the inner cavity of the sintering cylinder and the inner cavity enclosed by the upper cover body and the lower cover body constitute a transverse channel for the moving component to slide therein, the moving component includes a hanger and two sealing seats, the two ends of the hanger are fixedly connected to the two sealing seats by multiple connecting parts; the outer periphery of the two sealing seats can form a sliding seal with the inner wall of the upper cover body and the lower cover body, and the inner wall of the sintering cylinder; the telescopic cylinder is horizontally arranged, and the output end is fixedly connected to the outer side of the sealing seat to realize the driving of the moving component.

[0008] Preferably, a vacuum unit is provided in the base, a guide cavity is provided in the upper cover body and the lower cover body, and a plurality of air holes are provided in the inner walls, and pressure valves are fixedly installed in the plurality of air holes, a plurality of insert tubes are vertically fixedly installed on the front side of the upper end of the lower cover body, a plurality of plug holes are vertically provided on the front side of the bottom end of the upper cover body, the insert tubes and the plug holes are both connected to the guide cavity, and the vacuum unit is connected to the two groups of auxiliary units and the inside of the sintering cylinder.

[0009] Preferably, a groove is provided on the opposite side of the two sealing seats, an impeller is fixedly sleeved in the groove, the impellers in the two sealing seats have opposite diversion directions, a plurality of diversion holes are provided in the sealing seat, the diversion holes are connected to the groove, and a rotating component is provided in the column for driving the bracket to rotate.

[0010] Preferably, the rotating component includes a second motor, two pulleys and a transmission belt. The telescopic cylinder is rotatably sleeved in the column, and the second motor is horizontally fixedly sleeved in the column. The two pulleys are respectively fixedly sleeved on the output shaft of the telescopic cylinder and the second motor and are connected by a transmission belt. The torque of the second motor is transmitted to the sealing seat through the telescopic cylinder, driving the bracket to rotate.

[0011] Preferably, the vacuum unit includes an air pump device, a first solenoid valve, a conduit and a four-way joint. The air pump device is fixedly installed in the base, the conduit is vertically arranged, the top end passes through the bottom of the sintering cylinder and is connected to the interior thereof, and the bottom end is connected to the port of the air pump device. The first solenoid valve is fixedly installed on the conduit, and the four-way joint is fixedly sleeved on the conduit. The interfaces on both sides of the four-way joint are fixedly connected with a first hose, and the ends of the two first hoses that are away from each other are respectively connected to the interior of the guide chamber in the two lower covers.

[0012] Preferably, a three-way joint is installed at the bottom of the lower cover body, the top interface of the three-way joint is fixedly installed in the lower cover body and is communicated with the diversion cavity, the end of the first hose away from the four-way joint is connected to the interface of the three-way joint through a second solenoid valve, the other interface of the three-way joint is fixedly connected to the second hose through a third solenoid valve, and the end of the second hose away from the three-way joint is connected to the refrigeration unit.

[0013] Preferably, the lifting assembly includes a support frame, two slides, four support rods and a driving component. The support frame is in a right-angle shape, and the two sides of the bottom horizontal section are respectively fixedly connected to the base and the column. The refrigeration unit is fixedly installed on the upper side of the bottom of the support frame. The inner walls on both sides of the vertical section of the support frame are vertically provided with sliding grooves. The two slides are horizontally arranged and placed up and down, and the two ends are respectively slidably embedded in the two sliding grooves. The four support rods are respectively fixedly installed horizontally and longitudinally on the front sides of the two slides. The top of the upper cover body and the bottom of the lower cover body are respectively fixedly connected to the side of the four support rods close to each other. The two slides are connected by a driving component, and are driven by the driving component to approach or move away from each other at the same time.

[0014] Preferably, the driving component includes a first motor, a screw and a frame, the frame is fixedly mounted on the top of the support frame, the first motor is vertically fixedly mounted in the frame, the screw is vertically rotatably sleeved in the support frame, two slides are threadedly sleeved on the screw, the first motor drives the screw to drive the two slides to slide up and down in the support frame, approaching or moving away from each other; the slide drives the upper cover body and the lower cover body to move through the support rod.

[0015] The beneficial effects of the present invention are as follows:

[0016] (1) With the cooperation of two sets of auxiliary units, the present invention realizes the circulation of NdFeB magnets by sealing and sliding the moving components carrying NdFeB magnets on the inner wall of the upper cover and the lower cover and the inner wall of the sintering cylinder, and can continuously realize the loading and unloading, sintering and cooling process of NdFeB magnets. It only needs to evacuate the inside of the cylinder once, and in the subsequent sintering operation, the inside of the cylinder can always be in a vacuum state, which can meet the needs of continuous sintering operations and improve production efficiency;

[0017] (2) In the present invention, while the sintering cylinder is sintering, the two groups of auxiliary units can respectively realize the loading, cooling and unloading processes, saving time, further realizing the continuous operation of the sintering cylinder and improving efficiency;

[0018] (3) In the present invention, after the sintering work of the sintering cylinder is completed and the sintering cylinder reaches the second auxiliary unit, i.e., the unloading position, the refrigeration unit and the rotating component are operated, and at the same time, the impeller rotates, so that the airflow can circulate horizontally through the guide hole, further realizing that the NdFeB magnet is in more sufficient contact with the cooling airflow, thereby improving the efficiency of the cooling process;

[0019] (4) After the batch of NdFeB magnets is completely sintered, the two telescopic cylinders are fully retracted and the sintering cylinder is in a conductive state, which is convenient for heat dissipation and maintenance. The air pump device operates to inhale air, so that the air flow in the sintering cylinder can flow, or the upper and lower covers on both sides are closed, and the two telescopic cylinders are repeatedly extended and retracted. At the same time, the two refrigeration units are started to send cold air into the sintering cylinder to further accelerate its cooling speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the front view of a continuous vacuum sintering system for NdFeB magnets proposed by the present invention;

[0021] Figure 2 A rear perspective structural schematic diagram of a continuous vacuum sintering system for NdFeB magnets proposed by the present invention;

[0022] Figure 3 A schematic diagram of a partial cross-sectional structure of a continuous vacuum sintering system for NdFeB magnets proposed by the present invention;

[0023] Figure 4 A schematic diagram of the side cross-sectional structure of an upper cover and a lower cover in a continuous vacuum sintering system for NdFeB magnets proposed by the present invention;

[0024] Figure 5 This is a schematic diagram of the front cross-sectional structure of a sealing seat in a continuous vacuum sintering system for NdFeB magnets proposed by the present invention.

[0025] In the figure: 1, sintering cylinder; 101, heat insulation layer; 102, uniform heat layer; 2, base; 3, upper cover; 4, lower cover; 5, sealing seat; 6, hanger; 7, telescopic cylinder; 8, connecting piece; 9, heating unit; 10, flow guide cavity; 11, air hole; 12, intubation tube; 13, jack; 14, air pump device; 15, first solenoid valve; 16, conduit; 17, four-way joint; 18, first hose; 19, three-way Connector; 20, second solenoid valve; 21, third solenoid valve; 22, second hose; 23, refrigeration unit; 24, column; 25, support frame; 26, slide plate; 27, support rod; 28, slide groove; 29, pressure valve; 30, first motor; 31, coupling; 32, screw; 33, frame; 34, groove; 35, impeller; 37, guide hole; 38, second motor; 39, pulley; 40, transmission belt. DETAILED DESCRIPTION

[0026] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, what is described is only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figure 1-5 A continuous vacuum sintering system for NdFeB magnets comprises: a sintering cylinder 1 and a base 2. The sintering cylinder 1 is horizontally fixedly mounted on the base 2. The sintering cylinder 1 consists of a heat insulating layer 101 and a heat uniforming layer 102. The heat insulating layer 101 is fixedly sleeved on the outside of the heat uniforming layer 102. The heat insulating layer 101 and the inner wall of the heat uniforming layer 102 are smoothly and seamlessly connected. A heating unit 9 is fixedly mounted in the base 2. The output end of the heating unit 9 is fixedly embedded in the heat uniforming layer 102.

[0028] It also includes multiple groups of moving components for carrying NdFeB magnets and auxiliary units placed on both sides of the sintering cylinder 1, wherein the first group of auxiliary units realizes the loading process, while the other group of auxiliary units can realize the cooling and unloading process. Each group of auxiliary units includes an upper cover body 3, a lower cover body 4, a telescopic cylinder 7 and a lifting assembly. The upper cover body 3 and the lower cover body 4 are connected by the lifting assembly, and a column 24 is sleeved on the outside of the telescopic cylinder 7; the inner cavity of the sintering cylinder 1 and the inner cavity enclosed by the upper cover body 3 and the lower cover body 4 constitute a transverse channel in which the moving assembly can slide, and the moving assembly includes a hanger 6 and two sealing seats 5. The two ends of the hanger 6 are fixedly connected to the two sealing seats 5 by multiple connecting pieces 8, and the two sealing seats 5 are opposite to each other. The two ends of the hanger 6 are fixedly connected to the two sealing seats 5 by multiple connecting pieces 8. The hanger 6 is used to place the NdFeB magnets to be sintered. A clamping position is opened in the hanger 6. The NdFeB magnets to be sintered are placed and fixed by a fixture, and the fixture is clamped into the clamping position, and the NdFeB magnets to be sintered are loaded on the hanger 6 by a lock. The entire material loading area is in a grid shape, and gaps are left between the materials to facilitate sufficient heating.

[0029] The outer periphery of the two sealing seats 5 can form a sliding seal with the inner wall of the upper cover body 3 and the lower cover body 4 and the inner wall of the sintering cylinder 1; the telescopic cylinder 7 is arranged horizontally, and the output end is fixedly connected to the outer side of the sealing seat 5 to realize the driving of the moving component. Specifically, after the upper cover body 3 and the lower cover body 4 are closed, the end can be sealed and connected with the side end of the sintering cylinder 1, and the two sealing seats 5 can be driven by the telescopic cylinder 7 to seal and slide on the inner wall of the upper cover body 3 and the lower cover body 4 and the inner wall of the sintering cylinder 1.

[0030] A vacuum unit is provided in the base 2, a guide cavity 10 is provided in both the upper cover body 3 and the lower cover body 4, and a plurality of air holes 11 are provided in the inner walls, a pressure valve 29 is fixedly installed in each of the plurality of air holes 11, and the pressure valve 29 is a two-way guide valve, a plurality of inserting tubes 12 are vertically fixedly installed on the front side of the upper end of the lower cover body 4, a plurality of inserting holes 13 are vertically provided on the front side of the bottom end of the upper cover body 3, the inserting tubes 12 and the inserting holes 13 are both connected to the guide cavity 10, and the vacuum unit is connected to the two sets of auxiliary units and the inside of the sintering cylinder 1.

[0031] Each electrical device is powered by an external power supply, and the entire device is controlled by a control terminal. Since the control terminal is a commonly used device and belongs to existing mature technology, its electrical connection relationship and specific circuit structure will not be described in detail here.

[0032] The vacuum unit includes an air pump device 14, a first solenoid valve 15, a conduit 16 and a four-way joint 17. The air pump device 14 is fixedly installed in the base 2. The conduit 16 is vertically arranged. The top end passes through the bottom of the sintering cylinder 1 and is connected to the interior thereof, and the bottom end is connected to the port of the air pump device 14. The first solenoid valve 15 is fixedly installed on the conduit 16. The four-way joint 17 is fixedly sleeved on the conduit 16. The interfaces on both sides of the four-way joint 17 are fixedly connected with first hoses 18. The ends of the two first hoses 18 that are away from each other are respectively connected to the interior of the guide chamber 10 in the two lower covers 4.

[0033] A three-way joint 19 is installed at the bottom of the lower cover body 4, and the top interface of the three-way joint 19 is fixedly installed in the lower cover body 4 and is communicated with the diversion cavity 10. The end of the first hose 18 away from the four-way joint 17 is connected to the interface of the three-way joint 19 through the second solenoid valve 20, and the other interface of the three-way joint 19 is fixedly connected to the second hose 22 through the third solenoid valve 21, and the end of the second hose 22 away from the three-way joint 19 is connected to the refrigeration unit 23.

[0034] The lifting assembly includes a support frame 25, two slides 26, multiple support rods 27 and a driving component. The support frame 25 is in a right angle shape, and the two sides of the bottom horizontal section are respectively fixedly connected to the base 2 and the column 24. The refrigeration unit 23 is fixedly installed on the upper side of the bottom of the support frame 25. The inner walls on both sides of the vertical section of the support frame 25 are vertically provided with slide grooves 28. The two slides 26 are both horizontally arranged and placed up and down, and the two ends are respectively slidably embedded in the two slide grooves 28. Multiple support rods 27 are respectively fixedly installed horizontally and longitudinally on the front sides of the two slides 26. The top of the upper cover body 3 and the bottom of the lower cover body 4 are respectively fixedly connected to one side of the multiple support rods 27. The two slides 26 are connected by a driving component and are driven by the driving component to approach or move away from each other at the same time.

[0035] The driving components include a first motor 30, a coupling 31, a screw 32 and a frame 33. The frame 33 is fixedly installed on the top of the support frame 25. The first motor 30 is vertically fixedly installed in the frame 33. The screw 32 is vertically rotatably sleeved in the support frame 25. The two slides 26 are both threadedly sleeved on the screw 32. The top of the screw 32 is fixedly connected to the output shaft of the first motor 30 through the coupling 31. The first motor 30 rotates, and the screw 32 is driven to rotate through the coupling 31. The screw 32 drives the two slides 26 to slide up and down in the support frame 25, approaching or moving away from each other. The slides 26 drive the upper cover body 3 and the lower cover body 4 to move through the support rod 27, thereby realizing the closing and separation of the upper cover body 3 and the lower cover body 4.

[0036] When using this equipment to sinter NdFeB magnets, in the initial state, the upper cover body 3 and the lower cover body 4 of the first auxiliary unit are in the open state, the material is loaded into the hanger 6 and fixed, and then the driving component is operated to merge the upper cover body 3 and the lower cover body 4 of the two auxiliary units to seal the material, start the air pump device 14, and make the first solenoid valve 15 and the two second solenoid valves 20 turned on. The first solenoid valve 15 is turned on, so that the air pump device 14 vacuumizes the inside of the sintering cylinder 1 through the conduit 16, and the two second solenoid valves 20 are turned on, so that the air pump device 14 vacuumizes the inside of the upper cover body 3 and the lower cover body 4 through the two first hoses 18.

[0037] After the vacuum operation is completed, the first solenoid valve 15 and the two second solenoid valves 20 are closed, one of the telescopic cylinders 7 is extended, and the two sealing seats 5 and the hanger 6 carrying the NdFeB magnets are sent into the sintering cylinder 1. The heating unit 9 is started for heating, and the heat radiation in the sintering cylinder 1 is made more uniform through the uniform heating layer 102 to achieve sintering of the material.

[0038] After the sintering operation is completed, the extended telescopic cylinder 7 is shortened and reset, and the other telescopic cylinder 7 is extended to push another set of hangers 6 into the sintering cylinder 1, and the hangers 6 that have been sintered are moved out of the sintering cylinder 1. During the transfer process, the sintering cylinder 1 is always in a sealed state, and the temperature rise sintering operation can be carried out. There is no need to perform a vacuum operation again in the sintering cylinder 1. The hangers 6 that have been sintered are moved to the upper cover 3 and the lower cover 4 of the corresponding second auxiliary unit. At this time, the corresponding third solenoid valve 21 is turned on, and the refrigeration unit 23 on the same side is running. After entering the diversion cavity 10 through the second hose 22 and the three-way joint 19, multiple pressure valves 29 are turned on to cool the NdFeB magnet that has just been sintered.

[0039] After the cooling is completed, the upper cover body 3 and the lower cover body 4 are separated by the lifting assembly of the second auxiliary unit, the NdFeB magnets that have been sintered and cooled are removed, and then a new batch of NdFeB magnets to be sintered are placed on the first auxiliary unit. The upper cover body 3 and the lower cover body 4 of the first auxiliary unit are closed by the lifting assembly, the second solenoid valve 20 on the same side is turned on, and the air pump device 14 is operated to evacuate the cavity between the loaded upper cover body 3 and the lower cover body 4.

[0040] After the NdFeB magnets in the sintering cylinder 1 are sintered, the telescopic cylinder 7 on the other side is shortened to move the sintered NdFeB magnets out, and the telescopic cylinder 7 on the same side of the loaded hanger 6 is extended to send the NdFeB magnets to be sintered into the sintering cylinder 1. During the whole process, the sintering cylinder 1 is always in a vacuum state.

[0041] When the sintered NdFeB magnets are removed from the sintering cylinder 1 , the corresponding upper cover 3 and lower cover 4 are in a closed state, ensuring that the sintering cylinder 1 is always in a vacuum state.

[0042] Through the above process, when performing sintering operation, it is only necessary to perform a vacuum operation on the inside of the sintering cylinder 1 once. In the subsequent sintering operation, the inside of the sintering cylinder 1 is always in a vacuum state, and there is no need to perform a vacuum operation again, which meets the needs of continuous sintering operation and improves efficiency.

[0043] With the cooperation of the two auxiliary units, the loading and unloading of NdFeB magnets can be realized, and the sintering cylinder 1 can be unloaded while loading without repeated vacuuming, which saves time and further realizes the continuous operation of the sintering cylinder 1 and improves efficiency.

[0044] A groove 34 is provided on the opposite side of the two sealing seats 5, and an impeller 35 is fixedly sleeved in the groove 34. The impellers 35 in the two sealing seats have opposite diversion directions. A rotating component is provided in the column 24 for driving the hanger 6 to rotate. A plurality of diversion holes 37 are provided in the sealing seat 5, and the diversion holes 37 are connected to the groove 34.

[0045] The rotating component includes a second motor 38, two pulleys 39 and a transmission belt 40. The telescopic cylinder 7 is rotatably sleeved in the column 24, and the second motor 38 is horizontally fixedly sleeved in the column 24. The two pulleys 39 are respectively fixedly sleeved on the output shafts of the telescopic cylinder 7 and the second motor 38, and are connected by the transmission belt 40. The torque of the second motor 38 is transmitted to the sealing seat 5 through the telescopic cylinder 7, driving the bracket 6 to rotate.

[0046] After sintering is completed, the refrigeration unit 23 is operated to pass cold air between the upper cover 3 and the lower cover 4 of the second auxiliary unit to achieve cooling of the NdFeB magnet. During cooling, the second motor 38 in the rotating component is operated to transmit torque to the telescopic cylinder 7 through two pulleys 39 and a transmission belt 40, and the telescopic cylinder 7 drives the sealing seat 5 to rotate, and the sealing seat 5 drives the bracket 6 to rotate, so that it is more fully in contact with the cold air flow. At the same time, the two impellers 35 rotate, which can make the air flow circulate horizontally through the guide hole 37, further achieving more full contact between the NdFeB magnet and the cooling air flow, and improving the cooling efficiency.

[0047] During the sintering process, the rotating parts can also be operated, and the rack 6 drives the NdFeB magnets to rotate, so that the NdFeB magnets are heated more evenly and fully.

[0048] After the batch of NdFeB magnets is completely sintered, the two telescopic cylinders 7 are completely shortened, so that the two inner sealing seats 5 are completely separated from the sintering cylinder 1, and the sintering cylinder 1 is in a conductive state, which is convenient for heat dissipation and maintenance and inspection, and the air pump device 14 is started. The air pump device 14 operates to inhale air, so that the air flow in the sintering cylinder 1 can flow, or the upper cover body 3 and the lower cover body 4 on both sides are closed, and the two telescopic cylinders 7 are repeatedly extended and retracted. At the same time, the two refrigeration units 23 are started, and the cold air is sent into the sintering cylinder 1 through the movement of the sealing seat 5, further accelerating its cooling speed.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A continuous vacuum sintering system for NdFeB magnets, comprising: A sintering cylinder (1) and a base (2), wherein the sintering cylinder (1) is fixedly mounted horizontally on the base (2), the sintering cylinder (1) is composed of a heat insulating layer (101) and a heat-uniform layer (102), a heating unit (9) is fixedly mounted in the base (2), and an output end of the heating unit (9) is fixedly embedded in the heat-uniform layer (102); The invention is characterized in that it also includes a plurality of groups of moving components for carrying NdFeB magnets and auxiliary units placed on both sides of the sintering cylinder (1), and each group of auxiliary units includes an upper cover (3), a lower cover (4), a telescopic cylinder (7) and a lifting assembly, the upper cover (3) and the lower cover (4) are connected by the lifting assembly, and the telescopic cylinder (7) is sleeved with a column (24) on the outside; the inner cavity of the sintering cylinder (1) and the inner cavity enclosed by the upper cover (3) and the lower cover (4) form a movable A transverse channel for a movable assembly to slide therein, the movable assembly comprising a hanger (6) and two sealing seats (5), the two ends of the hanger (6) being fixedly connected to the two sealing seats (5) respectively via a plurality of connecting pieces (8); the outer peripheries of the two sealing seats (5) can form a sliding seal with the inner walls of the upper cover body (3) and the lower cover body (4) and the inner wall of the sintering cylinder (1); the telescopic cylinder (7) is arranged horizontally, and the output end is fixedly connected to the outer side surface of the sealing seat (5) to realize driving of the movable assembly; The base (2) is provided with a vacuum unit, the upper cover (3) and the lower cover (4) are both provided with a flow guide cavity (10), and the inner walls are both provided with a plurality of air holes (11), and a pressure valve (29) is fixedly installed in each of the plurality of air holes (11), a plurality of insert tubes (12) are vertically fixedly installed on the front side of the upper end of the lower cover (4), a plurality of plug holes (13) are vertically provided on the front side of the bottom end of the upper cover (3), the insert tubes (12) and the plug holes (13) are both in conduction with the flow guide cavity (10), and the vacuum unit is in conduction connection with the two groups of auxiliary units and the interior of the sintering cylinder (1); The vacuum unit comprises an air pump device (14), a first solenoid valve (15), a conduit (16) and a four-way joint (17); the air pump device (14) is fixedly mounted in the base (2); the conduit (16) is vertically arranged, with the top end penetrating the bottom of the sintering cylinder (1) and communicating with the interior thereof, and the bottom end being connected to a port of the air pump device (14); the first solenoid valve (15) is fixedly mounted on the conduit (16); the four-way joint (17) is fixedly sleeved on the conduit (16); both sides of the four-way joint (17) are fixedly connected to first hoses (18); and the ends of the two first hoses (18) that are away from each other are respectively communicated with the interior of the guide chambers (10) in the two lower covers (4); A groove (34) is provided on one side opposite to the other of the two sealing seats (5), an impeller (35) is fixedly mounted in the groove, the impellers (35) in the two sealing seats (5) have opposite flow diversion directions, a plurality of flow diversion holes (37) are provided in the sealing seat (5), the flow diversion holes (37) are in communication with the groove (34), and a rotating component is provided in the column (24) for driving the bracket (6) to rotate; The rotary component comprises a second motor (38), two pulleys (39) and a transmission belt (40); the telescopic cylinder (7) is rotatably sleeved in the column (24); the second motor (38) is horizontally fixedly sleeved in the column (24); the two pulleys (39) are respectively fixedly sleeved on the output shafts of the telescopic cylinder (7) and the second motor (38), and are connected via the transmission belt (40); the torque of the second motor (38) is transmitted to the sealing seat (5) via the telescopic cylinder (7), thereby driving the bracket (6) to rotate synchronously; A three-way joint (19) is installed at the bottom of the lower cover body (4); the top interface of the three-way joint (19) is fixedly installed in the lower cover body (4) and is communicated with the flow guide cavity (10); the end of the first hose (18) away from the four-way joint (17) is connected to the interface of the three-way joint (19) through a second solenoid valve (20); the other interface of the three-way joint (19) is fixedly connected to a second hose (22) through a third solenoid valve (21); and the end of the second hose (22) away from the three-way joint (19) is connected to a refrigeration unit (23).

2. A continuous vacuum sintering system for NdFeB magnets according to claim 1, characterized in that: The lifting assembly comprises a support frame (25), two slides (26), four support rods (27) and a driving component. The support frame (25) is in a right angle shape. Both sides of the bottom horizontal section are fixedly connected to the base (2) and the column (24) respectively. The refrigeration unit (23) is fixedly installed on the upper side of the bottom of the support frame (25). Both sides of the inner wall of the vertical section of the support frame (25) are vertically provided with slide grooves (28). The two slides (26) are horizontally arranged and arranged up and down. Both ends of the slides (26) are respectively slidably embedded in the two slide grooves (28). The four support rods (27) are respectively fixedly installed horizontally and longitudinally on the front sides of the two slides (26). The top of the upper cover body (3) and the bottom of the lower cover body (4) are respectively fixedly connected to the sides of the four support rods (27) that are close to each other. The two slides (26) are connected by the driving component and are driven by the driving component to move closer to or away from each other at the same time.

3. A continuous vacuum sintering system for NdFeB magnets according to claim 2, characterized in that: The driving component comprises a first motor (30), a screw rod (32) and a frame (33); the frame (33) is fixedly mounted on the top of the support frame (25); the first motor (30) is vertically fixedly mounted in the frame (33); the screw rod (32) is vertically rotatably sleeved in the support frame (25); the two slide plates (26) are both threadedly sleeved on the screw rod (32); the first motor (30) drives the screw rod (32) to drive the two slide plates (26) to slide up and down in the support frame (25) to move closer to or away from each other; the slide plates (26) drive the upper cover body (3) and the lower cover body (4) to move through the support rod (27).

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