A sintering device for neodymium iron boron magnets

Abstract

The present invention discloses a sintering device for NdFeB magnets, and the present invention relates to the field of magnet sintering technology, comprising a bottom plate, the top side wall of the bottom plate is fixedly connected with an outer furnace, the top side wall of the outer furnace is rotatably connected with a cover plate, and the bottom inner wall of the cover plate is fixedly connected with a first electric telescopic rod. The present invention can ensure that the coolant can continuously circulate to cool the inner furnace when the NdFeB magnet needs to be cooled, and can detect whether there are cracks on the outer wall of the annular NdFeB magnet. During the detection process of the NdFeB magnet, the NdFeB magnet will not be oxidized by contact with external oxygen, so as to prevent the subsequent use of the NdFeB magnet from being affected, and avoid the subsequent pretreatment of the NdFeB magnet, and the surface of the NdFeB magnet is covered with an epoxy coating, which affects the accuracy of the detection of cracks on the surface of the NdFeB magnet, and greatly improves the reliability and sintering effect of the device when sintering the NdFeB magnet.

Description

Technical Field

[0001] The invention belongs to the technical field of magnet sintering, and in particular relates to a sintering device for a neodymium iron boron magnet. Background Art

[0002] NdFeB permanent magnet material is a high-performance permanent magnet material that came out in 1983. It is the third generation of rare earth permanent magnets and one of the strongest permanent magnets available today. It is suitable for industries and occasions with special requirements.

[0003] When sintering NdFeB magnets, it is necessary to first put NdFeB powder into a carbon pressing mold, press it into shape, and then put the formed sample into a sintering furnace. The NdFeB powder is sintered in the sintering furnace to make it into the required annular NdFeB magnet. However, when sintering NdFeB magnets in the prior art, since the main components of NdFeB magnets are neodymium (Nd), iron (Fe) and boron (B), these materials themselves have high brittleness. During the sintering process, stress is generated inside the magnet, and the NdFeB magnet is prone to cracks under the action of these stresses. The cracks will cause the magnetic circuit inside the magnet to Discontinuity, thereby reducing the magnetic flux density (i.e. magnetic induction intensity). The reduction of magnetic flux density will directly affect the magnetic properties of the magnet and affect the subsequent use of the NdFeB magnet. However, the sintered NdFeB magnet cannot come into contact with oxygen before treatment to prevent oxidation. At this time, the staff cannot detect whether there are cracks on the surface of the sintered NdFeB magnet. After the pretreatment of the NdFeB magnet, the surface of the NdFeB magnet will be covered with an epoxy coating, which will affect the accuracy of the detection of cracks on the surface of the NdFeB magnet, greatly reducing the reliability and sintering effect of the NdFeB magnet during sintering.

[0004] Therefore, we propose a sintering device for NdFeB magnets to solve the above problems. Summary of the invention

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A sintering device for NdFeB magnets comprises a base plate, the top side wall of the base plate is fixedly connected to an outer furnace, the top side wall of the outer furnace is rotatably connected to a cover plate, the bottom inner wall of the cover plate is fixedly connected to a first electric telescopic rod, the telescopic end of the first electric telescopic rod is fixedly connected to a ceramic sealing plate, the top side wall of the base plate is fixedly connected to an inner furnace, the inner wall of the inner furnace is fixedly connected to a resistance wire, the outer wall of the outer furnace is fixedly connected to a first vacuum pump, the air inlet end of the first vacuum pump penetrates the side wall of the outer furnace and extends inward, the top side wall of the base plate is fixedly connected to a second vacuum pump, the air inlet end of the second vacuum pump penetrates the side wall of the inner furnace and extends inward, the air outlet end of the second vacuum pump penetrates the side wall of the outer furnace and extends outward, the bottom side wall of the base plate is fixedly connected to a circulating cooling component, the top side wall of the base plate is fixedly connected to a magnet external crack detection component, and the inner wall of the outer furnace is fixedly connected to a fixing component.

[0007] Preferably, the circulating cooling component includes a water tank fixedly connected to the side wall at the bottom end of the base plate, a first water pump is fixedly connected to the side wall at one end of the water tank, a water inlet end of the first water pump passes through the side wall of the water tank and extends inward, a water outlet end of the first water pump is fixedly connected to a connecting pipe, and a spiral tube is fixedly connected to the outer wall of the inner furnace, and one end of the spiral tube is fixedly connected to one end of the connecting pipe.

[0008] Preferably, the bottom end side wall of the base plate is fixedly connected to a refrigeration box, one end side wall of the refrigeration box is fixedly connected to a second water pump, the water inlet end of the second water pump penetrates the side wall of the refrigeration box and extends inward, the water outlet end of the second water pump penetrates the side wall of the water storage tank and extends inward, the other end of the spiral tube is fixedly connected to a connecting pipe, one end of the connecting pipe penetrates the bottom plate and the side wall of the refrigeration box and extends into the refrigeration box.

[0009] Preferably, the external crack detection component of the magnet includes two fixed frames symmetrically fixedly connected to the side walls of the top end of the bottom plate, the inner walls of the fixed frames are fixedly connected to the first electric slide rail, the side walls at one end of the first electric slide rail are slidably connected to the slide plate, the side walls at one end of the slide plate are fixedly connected to the second electric telescopic rod, the telescopic end of the second electric telescopic rod is fixedly connected to the side plate, the bottom side wall of one of the side plates is fixedly connected to the first connecting rod, and one end of the first connecting rod is fixedly connected to the first motor.

[0010] Preferably, the output end of the first motor is fixedly connected to the first connecting plate, the side wall of the first connecting plate is fixedly connected to the third electric telescopic rod, the telescopic end of the third electric telescopic rod is fixedly connected to the first U-plate, the inner wall of the first U-plate is rotatably connected to the first round rod, the side wall of the first U-plate is fixedly connected to the second motor, the output end of the second motor passes through the side wall of the first U-plate and is fixedly connected to one end of the first round rod, the rod wall of the first round rod is fixedly connected to the first detection plate, and the top side wall of the first detection plate is fixedly connected to the first ultrasonic detector.

[0011] Preferably, the bottom end side wall of the other side panel is fixedly connected to a second connecting rod, one end of the second connecting rod is fixedly connected to a third motor, the output end of the third motor is fixedly connected to a second connecting plate, the side wall of the second connecting plate is fixedly connected to a fourth electric telescopic rod, the telescopic end of the fourth electric telescopic rod is fixedly connected to a second U-plate, and the inner wall of the second U-plate is rotatably connected to a second round rod.

[0012] Preferably, a fourth motor is fixedly connected to the side wall of the second U-plate, the output end of the fourth motor passes through the side wall of the second U-plate and is fixedly connected to one end of the second round rod, the rod wall of the second round rod is fixedly connected to a second detection plate, and the bottom end side wall of the second detection plate is fixedly connected to a second ultrasonic detector.

[0013] Preferably, the fixing assembly includes two fifth electric telescopic rods symmetrically fixedly connected to the inner wall of the outer furnace, the telescopic ends of the fifth electric telescopic rods are fixedly connected to a mounting plate, the bottom end side wall of the mounting plate is fixedly connected to a sixth electric telescopic rod, the telescopic end of the sixth electric telescopic rod is fixedly connected to a support plate, and the side wall of the support plate is fixedly connected to a splint.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] By setting up the circulating cooling component, the magnet external crack detection component and the fixing component, when the NdFeB magnet needs to be cooled, it can be ensured that the coolant can be continuously circulated to cool the inner furnace, and before the NdFeB magnet is pretreated after sintering, the outer wall of the annular NdFeB magnet can be detected for cracks. During the detection process of the NdFeB magnet, the NdFeB magnet will not be oxidized by contact with external oxygen, so as to prevent the subsequent use of the NdFeB magnet from being affected, and to avoid the surface of the NdFeB magnet being covered with epoxy coating after the pretreatment of the NdFeB magnet, which affects the accuracy of the detection of cracks on the surface of the NdFeB magnet, thereby greatly improving the reliability and sintering effect of the device during the sintering of the NdFeB magnet. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 It is a schematic diagram of the structure of the present invention from other angles;

[0018] Figure 3 It is a schematic cross-sectional view of part of the structure of the present invention;

[0019] Figure 4 It is a schematic diagram of the partial structure of the present invention Figure 1 ;

[0020] Figure 5 It is a schematic diagram of the partial structure of the present invention Figure 2 ;

[0021] Figure 6 It is a schematic diagram of the partial structure of the present invention Figure 3 ;

[0022] Figure 7 It is a schematic diagram of the partial structure of the present invention Figure 4 .

[0023] In the figure: 1, bottom plate; 2, outer furnace; 3, cover plate; 4, first electric telescopic rod; 5, ceramic sealing plate; 6, inner furnace; 7, resistance wire; 8, first vacuum pump; 9, second vacuum pump; 10, circulating cooling assembly; 101, water storage tank; 102, first water pump; 103, connecting pipe; 104, spiral tube; 105, refrigeration box; 106, second water pump; 107, connecting pipe; 11, magnet external crack detection assembly; 111, fixed frame; 112, first electric slide rail; 113, slide plate; 114, second electric telescopic rod; 115, side plate; 116, first connecting rod; 117, first motor; 118, first connecting plate; 1 110. third electric telescopic rod; 1111. first U-plate; 1112. first round rod; 1113. second motor; 1114. first detection plate; 1115. first ultrasonic detector; 1116. second connecting rod; 1117. third motor; 1118. second connecting plate; 1119. fourth electric telescopic rod; 1120. second U-plate; 1121. second round rod; 1122. fourth motor; 1123. second detection plate; 1124. second ultrasonic detector; 12. fixing assembly; 121. fifth electric telescopic rod; 122. mounting plate; 123. sixth electric telescopic rod; 124. support plate; 125. clamping plate. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] The following electrical components are all electrically connected to the peripheral PLC controller.

[0026] Reference Figure 1 - Figure 7 A sintering device for NdFeB magnets comprises a bottom plate 1, an outer furnace 2 is fixedly connected to the top side wall of the bottom plate 1, a cover plate 3 is rotatably connected to the top side wall of the outer furnace 2, a first electric telescopic rod 4 is fixedly connected to the bottom inner wall of the cover plate 3, a ceramic sealing plate 5 is fixedly connected to the telescopic end of the first electric telescopic rod 4, an inner furnace 6 is fixedly connected to the top side wall of the bottom plate 1, a resistance wire 7 is fixedly connected to the inner wall of the inner furnace 6, a first vacuum pump 8 is fixedly connected to the outer wall of the outer furnace 2, an air inlet end of the first vacuum pump 8 penetrates through the side wall of the outer furnace 2 and extends inward, a second vacuum pump 9 is fixedly connected to the top side wall of the bottom plate 1, an air inlet end of the second vacuum pump 9 penetrates through the side wall of the inner furnace 6 and extends inward, an air outlet end of the second vacuum pump 9 penetrates through the side wall of the outer furnace 2 and extends outward, a circulating cooling component 10 is fixedly connected to the bottom side wall of the bottom plate 1, a magnet external crack detection component 11 is fixedly connected to the top side wall of the bottom plate 1, and a fixing component 12 is fixedly connected to the inner wall of the outer furnace 2.

[0027] In the embodiment, the circulating cooling component 10 includes a water storage tank 101 fixedly connected to the side wall of the bottom end of the bottom plate 1, a first water pump 102 is fixedly connected to the side wall of one end of the water storage tank 101, a water inlet end of the first water pump 102 penetrates the side wall of the water storage tank 101 and extends inward, a water outlet end of the first water pump 102 is fixedly connected to a connecting pipe 103, an outer wall of the inner furnace 6 is fixedly connected to a spiral tube 104, and one end of the spiral tube 104 is fixedly connected to one end of the connecting pipe 103;

[0028] The bottom end side wall of the base plate 1 is fixedly connected to a refrigeration box 105, and one end side wall of the refrigeration box 105 is fixedly connected to a second water pump 106, the water inlet end of the second water pump 106 penetrates the side wall of the refrigeration box 105 and extends inward, the water outlet end of the second water pump 106 penetrates the side wall of the water storage tank 101 and extends inward, and the other end of the spiral tube 104 is fixedly connected to a connecting pipe 107, and one end of the connecting pipe 107 penetrates the bottom plate 1 and the side wall of the refrigeration box 105 and extends into the refrigeration box 105.

[0029] Specifically, the cooled coolant in the refrigeration box 105 is transported to the water storage tank 101, and then the inner furnace 6 is continued to be cooled under the transportation of the first water pump 102, forming a circulation flow of the coolant, thereby ensuring that the coolant can continuously circulate to cool the inner furnace 6, and then reduce the temperature of the inner furnace 6 to a reasonable range.

[0030] In the embodiment, the magnet external crack detection component 11 includes two fixed frames 111 symmetrically fixedly connected to the top side walls of the bottom plate 1, the inner walls of the fixed frames 111 are fixedly connected to the first electric slide rail 112, the side walls of one end of the first electric slide rail 112 are slidably connected to the slide plate 113, the side wall of one end of the slide plate 113 is fixedly connected to the second electric telescopic rod 114, the telescopic end of the second electric telescopic rod 114 is fixedly connected to the side plate 115, the bottom side wall of one of the side plates 115 is fixedly connected to the first connecting rod 116, and one end of the first connecting rod 116 is fixedly connected to the first motor 117;

[0031] The output end of the first motor 117 is fixedly connected to the first connecting plate 118, the side wall of the first connecting plate 118 is fixedly connected to the third electric telescopic rod 1110, the telescopic end of the third electric telescopic rod 1110 is fixedly connected to the first U-plate 1111, the inner wall of the first U-plate 1111 is rotatably connected to the first round rod 1112, the side wall of the first U-plate 1111 is fixedly connected to the second motor 1113, the output end of the second motor 1113 passes through the side wall of the first U-plate 1111 and is fixedly connected to one end of the first round rod 1112, the rod wall of the first round rod 1112 is fixedly connected to the first detection plate 1114, and the top side wall of the first detection plate 1114 is fixedly connected to the first ultrasonic detector 1115;

[0032] A second connecting rod 1116 is fixedly connected to the side wall of the bottom end of another side plate 115, one end of the second connecting rod 1116 is fixedly connected to a third motor 1117, an output end of the third motor 1117 is fixedly connected to a second connecting plate 1118, a fourth electric telescopic rod 1119 is fixedly connected to the side wall of the second connecting plate 1118, a telescopic end of the fourth electric telescopic rod 1119 is fixedly connected to a second U-plate 1120, and an inner wall of the second U-plate 1120 is rotatably connected to a second round rod 1121;

[0033] The side wall of the second U-plate 1120 is fixedly connected with the fourth motor 1122, the output end of the fourth motor 1122 passes through the side wall of the second U-plate 1120 and is fixedly connected with one end of the second round rod 1121, the rod wall of the second round rod 1121 is fixedly connected with the second detection plate 1123, and the bottom end side wall of the second detection plate 1123 is fixedly connected with the second ultrasonic detector 1124.

[0034] Specifically, before pre-treating the sintered NdFeB magnets, the outer wall of the annular NdFeB magnet can be inspected for cracks. During the inspection of the NdFeB magnets, the NdFeB magnets will not be oxidized by contact with external oxygen, thereby preventing the subsequent use of the NdFeB magnets from being affected. The method also avoids the surface of the NdFeB magnets being covered with an epoxy coating after the pre-treatment, thereby affecting the accuracy of the detection of cracks on the surface of the NdFeB magnets. The reliability of the device during sintering of the NdFeB magnets and the sintering effect are greatly improved.

[0035] In the embodiment, the fixing assembly 12 includes two fifth electric telescopic rods 121 symmetrically fixedly connected to the inner wall of the outer furnace 2, the telescopic ends of the fifth electric telescopic rods 121 are fixedly connected to the mounting plate 122, the bottom end side wall of the mounting plate 122 is fixedly connected to the sixth electric telescopic rod 123, the telescopic end of the sixth electric telescopic rod 123 is fixedly connected to the support plate 124, and the side wall of the support plate 124 is fixedly connected to the splint 125.

[0036] Specifically, the NdFeB magnet in the inner furnace 6 can be fixed by the clamping plate 125, and then the NdFeB magnet can be lifted up to facilitate the use of the first ultrasonic detector 1115 to detect whether there are cracks on the bottom side wall of the annular NdFeB magnet.

[0037] The operating principle of the present invention is now described as follows:

[0038] In the present invention, when sintering is required, the staff first puts the pressed NdFeB powder into the bottom of the inner furnace 6, then covers the cover plate 3, and then controls the first electric telescopic rod 4 to start, driving the ceramic sealing plate 5 to move downward to seal the inner furnace 6, and then controls the first vacuum pump 8 and the second vacuum pump 9 to start, and extracts the air in the inner furnace 6 and the outer furnace 2 to ensure that there is no oxygen in the inner furnace 6 that contacts the NdFeB powder, and then controls the resistance wire 7 to start, heats the inner furnace 6, and raises the temperature in the inner furnace 6 to a temperature that meets the sintering temperature of the NdFeB magnets, thereby sintering the NdFeB magnets. After the sintering of the NdFeB magnets is completed, controls the first water pump 102 to start, and transports the coolant in the water tank 101 through the connecting pipe 103. The cooling liquid in the spiral tube 104 continuously rises along the direction of the spiral tube 104 to cool the inner furnace 6. The cooling liquid carrying the heat of the inner furnace 6 continuously enters the refrigeration box 105 through the connecting pipe 107. The cooling plate in the refrigeration box 105 is used to cool the cooling liquid carrying the heat of the inner furnace 6. At the same time, the second water pump 106 is controlled to start, and the cooled cooling liquid in the refrigeration box 105 is transported to the water storage tank 101. Then, the inner furnace 6 is continuously cooled under the transportation of the first water pump 102, forming a circulation flow of the cooling liquid, thereby ensuring that the cooling liquid can continuously circulate to cool the inner furnace 6. After the temperature of the inner furnace 6 is reduced to a reasonable range, the first electric telescopic rod 4 is controlled to contract to make the ceramic sealing plate 5 The opening above the inner furnace 6 is not blocked, and the air in the outer furnace 2 is pumped out by the first vacuum pump 8. After the inner furnace 6 is connected to the outer furnace 2, the neodymium iron boron magnet will not come into contact with the external oxygen. At this time, the second electric telescopic rod 114 above the second ultrasonic detector 1124 is first controlled to start, driving the side plate 115 to move toward the inner furnace 6, and then the corresponding first electric slide rail 112 is controlled to start, driving the slide plate 113 to move, so that the second ultrasonic detector 1124 is close to the bottom of the inner furnace 6, and the second electric telescopic rod 114 is controlled to make the second connecting rod 1116 located just above the center of the annular neodymium iron boron magnet, and then the fourth electric telescopic rod 1119 is controlled to start, driving the second U plate 1120 to move, so that the second ultrasonic detector 1124 below the second detection plate 1123 is moved. The sonic detector 1124 is located at the upper end of the annular NdFeB magnet, and then the second ultrasonic detector 1124 and the third motor 1117 are controlled to start, driving the second ultrasonic detector 1124 to rotate, so that the second ultrasonic detector 1124 detects whether there are cracks on the upper side wall of the annular NdFeB magnet. In this process, the detection position of the second ultrasonic detector 1124 is adjusted by controlling the extension and contraction of the fourth electric telescopic rod 1119 to ensure that the second ultrasonic detector 1124 can fully detect the upper side wall of the NdFeB magnet, and then the corresponding first electric slide rail 112 is controlled to drive the slide plate 113 to move upward for a certain distance, and then the fourth motor 1122 is controlled to start, driving the second round rod 1121 to rotate 90 degrees and then stop.Then, the fourth electric telescopic rod 1119 is controlled to start, driving the second detection plate 1123 to move to one side of the NdFeB magnet, and then the corresponding first electric slide rail 112 is controlled to start, so that the slide plate 113 drives the second U plate 1120 to move downward, so that the detection end of the second ultrasonic detector 1124 is located on one side of the annular NdFeB magnet, and then the third motor 1117 and the second ultrasonic detector 1124 are controlled to start, so that the second ultrasonic detector 1124 is rotated, thereby realizing the detection of whether there are cracks on the outer wall of the annular NdFeB magnet, and then the above components are controlled to return to their original positions, and then the fifth electric telescopic rod 121 is controlled to start, driving the mounting plate 122 to move toward the inner furnace 6, so that the clamping plate 125 is located above the annular NdFeB magnet. The sixth electric telescopic rod 123 is controlled to start, and the clamping plate 125 is driven to move downward, so that the clamping plate 125 is located on the outside of the NdFeB magnet. The fifth electric telescopic rod 121 is controlled to continue to start, and the clamping plate 125 is driven to move toward the outer wall of the NdFeB magnet, and the NdFeB magnet is fixed by the clamping plate 125. The sixth electric telescopic rod 123 is controlled to contract, and the NdFeB magnet is moved upward for a distance and then stopped. The second electric telescopic rod 114 above the first ultrasonic detector 1115 is controlled to start, and the side plate 115 is driven to move, so that the side plate 115 is located directly above the center of the annular NdFeB magnet. The corresponding first electric slide rail 112 is controlled to start, and the slide plate 113 is driven downward, so that the first detection plate 1114 is moved from the annular NdFeB magnet. The first ultrasonic detector 1115 is controlled to start and drive the first U plate 1111 to move toward the NdFeB magnet, so that the first ultrasonic detector 1115 is located at the bottom end of the annular NdFeB magnet. The first motor 117 is controlled to start and drive the first connecting plate 118 to rotate, so that the first ultrasonic detector 1115 rotates at the lower end of the NdFeB magnet. By controlling the start of the first ultrasonic detector 1115 and the rotation of the first ultrasonic detector 1115, the side wall of the bottom end of the annular NdFeB magnet is detected for cracks. The position of the first ultrasonic detector 1115 is controlled by controlling the extension and contraction of the third electric telescopic rod 1110 to ensure that the first ultrasonic detector 1115 can completely detect the bottom of the NdFeB magnet. The side wall of the end is detected, and then the second motor 1113 is controlled to start, driving the first round rod 1112 to rotate, so that the first detection plate 1114 rotates 90 degrees and then stops, and then the third electric telescopic rod 1110 is controlled to shrink, and then the corresponding first electric slide rail 112 is controlled to start, driving the first slide plate 113 to move upward, so that the detection end of the first ultrasonic detector 1115 on one side of the first detection plate 1114 corresponds to the inner wall of the annular NdFeB magnet, and then the first motor 117 and the first ultrasonic detector 1115 are controlled to start again to detect whether there are cracks on the inner wall of the NdFeB magnet. After cracks are detected on the surface of the NdFeB magnet, it means that the NdFeB magnet does not meet the factory requirements, and there is no need to continue to perform subsequent processing on the NdFeB magnet.When the NdFeB magnet needs to be cooled, the inner furnace 6 can be cooled to ensure that the coolant can circulate continuously, and before the NdFeB magnet is pretreated after sintering, the outer wall of the annular NdFeB magnet can be detected for cracks. During the detection of the NdFeB magnet, the NdFeB magnet will not be oxidized by contact with external oxygen, which prevents the subsequent use of the NdFeB magnet from being affected, and avoids the surface of the NdFeB magnet being covered with an epoxy coating after the NdFeB magnet is pretreated, which affects the accuracy of the detection of cracks on the surface of the NdFeB magnet, thereby greatly improving the reliability and sintering effect of the device during the sintering of the NdFeB magnet.

[0039] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A sintering device for NdFeB magnets, comprising a base plate (1), characterized in that: The top side wall of the bottom plate (1) is fixedly connected to an outer furnace (2), the top side wall of the outer furnace (2) is rotatably connected to a cover plate (3), the bottom inner wall of the cover plate (3) is fixedly connected to a first electric telescopic rod (4), the telescopic end of the first electric telescopic rod (4) is fixedly connected to a ceramic sealing plate (5), the top side wall of the bottom plate (1) is fixedly connected to an inner furnace (6), the inner wall of the inner furnace (6) is fixedly connected to a resistance wire (7), the outer wall of the outer furnace (2) is fixedly connected to a first vacuum pump (8), the first vacuum pump (8) is fixedly connected to a first vacuum pump (8) and the first vacuum pump (8) is fixedly connected to a first vacuum pump (8). The air inlet end penetrates the side wall of the outer furnace (2) and protrudes inwards; the top side wall of the bottom plate (1) is fixedly connected to a second vacuum pump (9); the air inlet end of the second vacuum pump (9) penetrates the side wall of the inner furnace (6) and protrudes inwards; the air outlet end of the second vacuum pump (9) penetrates the side wall of the outer furnace (2) and protrudes outwards; the bottom side wall of the bottom plate (1) is fixedly connected to a circulating cooling component (10); the top side wall of the bottom plate (1) is fixedly connected to a magnet external crack detection component (11); and the inner wall of the outer furnace (2) is fixedly connected to a fixing component (12); The magnet external crack detection component (11) comprises two fixed frames (111) symmetrically fixedly connected to the top side walls of the bottom plate (1); the inner walls of the fixed frames (111) are fixedly connected to a first electric slide rail (112); the side walls at one end of the first electric slide rail (112) are slidably connected to a slide plate (113); the side walls at one end of the slide plate (113) are fixedly connected to a second electric telescopic rod (114); the telescopic end of the second electric telescopic rod (114) is fixedly connected to a side plate (115); the bottom side wall of one of the side plates (115) is fixedly connected to a first connecting rod (116); and one end of the first connecting rod (116) is fixedly connected to a first motor (117).

2. The sintering device of a NdFeB magnet according to claim 1, characterized in that: The circulating cooling component (10) comprises a water storage tank (101) fixedly connected to the side wall at the bottom end of the base plate (1); a first water pump (102) is fixedly connected to the side wall at one end of the water storage tank (101); a water inlet end of the first water pump (102) penetrates the side wall of the water storage tank (101) and extends inward; a water outlet end of the first water pump (102) is fixedly connected to a connecting pipe (103); and a spiral tube (104) is fixedly connected to the outer wall of the inner furnace (6); one end of the spiral tube (104) is fixedly connected to one end of the connecting pipe (103).

3. The sintering device of NdFeB magnet according to claim 2, characterized in that: The bottom side wall of the bottom plate (1) is fixedly connected to a refrigeration box (105), one end side wall of the refrigeration box (105) is fixedly connected to a second water pump (106), a water inlet end of the second water pump (106) penetrates the side wall of the refrigeration box (105) and protrudes inwardly, a water outlet end of the second water pump (106) penetrates the side wall of the water storage tank (101) and protrudes inwardly, and the other end of the spiral tube (104) is fixedly connected to a connecting pipe (107), one end of the connecting pipe (107) penetrates the bottom plate (1) and the side wall of the refrigeration box (105) and protrudes into the refrigeration box (105).

4. The sintering device of NdFeB magnet according to claim 1, characterized in that: The output end of the first motor (117) is fixedly connected to a first connecting plate (118); a side wall of the first connecting plate (118) is fixedly connected to a third electric telescopic rod (1110); a telescopic end of the third electric telescopic rod (1110) is fixedly connected to a first U-plate (1111); an inner wall of the first U-plate (1111) is rotatably connected to a first round rod (1112); a side wall of the first U-plate (1111) is fixedly connected to a second motor (1113); an output end of the second motor (1113) passes through the side wall of the first U-plate (1111) and is fixedly connected to one end of the first round rod (1112); a rod wall of the first round rod (1112) is fixedly connected to a first detection plate (1114); and a top side wall of the first detection plate (1114) is fixedly connected to a first ultrasonic detector (1115).

5. The sintering device of NdFeB magnet according to claim 4, characterized in that: A second connecting rod (1116) is fixedly connected to the side wall at the bottom end of the other side plate (115); one end of the second connecting rod (1116) is fixedly connected to a third motor (1117); an output end of the third motor (1117) is fixedly connected to a second connecting plate (1118); a fourth electric telescopic rod (1119) is fixedly connected to the side wall of the second connecting plate (1118); a telescopic end of the fourth electric telescopic rod (1119) is fixedly connected to a second U-plate (1120); and an inner wall of the second U-plate (1120) is rotatably connected to a second round rod (1121).

6. The sintering device of NdFeB magnet according to claim 5, characterized in that: A fourth motor (1122) is fixedly connected to the side wall of the second U-plate (1120); an output end of the fourth motor (1122) passes through the side wall of the second U-plate (1120) and is fixedly connected to one end of a second round rod (1121); a second detection plate (1123) is fixedly connected to the rod wall of the second round rod (1121); and a second ultrasonic detector (1124) is fixedly connected to the bottom side wall of the second detection plate (1123).

7. The sintering device of NdFeB magnet according to claim 1, characterized in that: The fixing assembly (12) comprises two fifth electric telescopic rods (121) symmetrically fixedly connected to the inner wall of the outer furnace (2); the telescopic ends of the fifth electric telescopic rods (121) are both fixedly connected to a mounting plate (122); the side wall of the bottom end of the mounting plate (122) is fixedly connected to a sixth electric telescopic rod (123); the telescopic end of the sixth electric telescopic rod (123) is fixedly connected to a support plate (124); and the side wall of the support plate (124) is fixedly connected to a clamping plate (125).

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