CN216801681U - Magnetic field press equipment - Google Patents

Abstract

The utility model relates to an oriented forming device for NdFeB magnetic powder, in particular to a magnetic field press device. The structural defect of the existing magnetic field press equipment is overcome. Comprises a feeding mechanism, a magnetic field press and a packaging mechanism. The feeding mechanism comprises a material tank, a material weighing machine, a filtering and receiving device, a vibrating screen, a sending tank and a fan, wherein the sending tank is arranged at a position lower than the material weighing machine, and the top of the material tank is in butt joint with the top of the sending tank. Guide rods are vertically arranged on the left side and the right side of the magnetic field press between the upper beam and the lower beam, and the upper punch and the lower punch are respectively driven by an upper electric driving mechanism and a lower electric driving mechanism. The packaging mechanism comprises a vacuum chamber base, a vacuum chamber upper cover and a vacuum-pumping tube, wherein a groove serving as a vacuum chamber is formed in the upper end face of the vacuum chamber base, one end of the vacuum-pumping tube is inserted into the vacuum chamber in a sealed mode, and the other end of the vacuum-pumping tube is connected with a vacuum pump. The feeding mechanism comprises a feeding guide plate and a feeding cylinder positioned on the feeding guide plate, and the feeding cylinder reciprocates between the lower part of the weighing machine and the right upper part of the die.

Description

Magnetic field press equipment

Technical Field

The utility model relates to an orientation molding device for magnetic materials, in particular to NdFeB magnetic powder, and specifically relates to a magnetic field press device.

Background

Fig. 1 shows a conventional magnetic field press apparatus, which includes a feeding mechanism, a magnetic field press, and a packaging mechanism.

The feeding mechanism comprises a charging bucket 1 and a material weighing machine 2 below the charging bucket 1. The weighing machine 2 is a commercially available well-known product. The magnetic powder in the charging bucket 1 slowly falls into the material weighing machine 2 by gravity. When the magnetic powder on the material weighing machine 2 reaches the required weight, the weighed magnetic powder is automatically released to the feeding mechanism. Because the charging bucket 1 is positioned above the material weighing machine 2, the height of the interface between the charging bucket and the material weighing machine is 2.3-2.8 m, and the height of the top of the charging bucket is 3.5-4.0 m by adding the height of the charging bucket. The workman docks the material jar, and the operation degree of difficulty is big, has the potential safety hazard.

The feeding mechanism comprises a vibrating feeder 3, the feeder receives the magnetic powder released by the weighing machine of the feeding mechanism, and is driven to move between the weighing machine and the die 4 of the magnetic field press, so that the magnetic powder received by the weighing machine is injected into the die 4 of the magnetic field press. The inlet size of the die, the poor flowability of the magnetic powder and the structure of the feeder limit the feeder, so that the magnetic powder is not injected into the die smoothly by the feeder, and the working reliability of the equipment is affected.

The magnetic field press comprises a die 4, an upper beam 5, a lower beam 6, an upper punch 7 and a lower punch 8; the upper punch 7 and the lower punch 8 are driven by hydraulic cylinders fixed to the top and the bottom of the upper beam and the lower beam, respectively, to move up and down oppositely, and press the magnetic powder in the mold to form (the magnetic field press further includes an electromagnetic coil for generating a magnetic field in which the magnetic powder is oriented). Since the hydraulic cylinder as a power source for driving the upper and lower punches generates a control error due to the presence of bubbles in the liquid pressure medium, a delay in compression response, and the like, and the accuracy of pressure control is affected, it is desired to replace the magnetic field press with hydraulic drive for electric drive.

The blank after the orientation molding needs to be subjected to vacuum packaging in a packaging mechanism, namely, the blank is sealed and coated by a plastic bag or a plastic film for the subsequent isostatic pressing process. The packaging mechanism comprises a sealed cabin, a known vacuum packaging machine is arranged in the sealed cabin, an arm of an operator stretches into the sealed cabin in a sealed mode, a blank is placed into a plastic bag and then placed into a vacuum chamber of the vacuum packaging machine, and heat sealing is carried out after vacuumizing. Because the vacuum chamber of the existing vacuum packaging machine is large, the vacuumizing time is long, the production efficiency is influenced, and the volume of the sealed cabin is overlarge.

Disclosure of Invention

The utility model provides an improved magnetic field press device for overcoming the structural defects of the existing magnetic field press device.

The utility model is realized by adopting the following technical scheme: a magnetic field press device comprises a feeding mechanism, a magnetic field press and a packaging mechanism;

the feeding mechanism comprises a charging bucket and a weighing machine, and further comprises a filtering and receiving device, a vibrating screen, a sending tank and a fan, wherein the filtering and receiving device comprises a cyclone separator and a filter; the cyclone separator and the vibrating screen are positioned above the material weighing machine, a discharge port of the cyclone separator is butted with a feed port of the vibrating screen, an air inlet pipe orifice of the cyclone separator is connected with an air outlet of the fan through an air supply pipe, an air return pipe orifice of the cyclone separator is connected with an inlet of the filter through an air return pipe, and an outlet of the filter is connected with an air inlet of the fan through the air return pipe; the discharge port of the vibrating screen is connected with a material weighing machine; the sending tank is arranged at a position lower than the material weighing machine, the material tank is in butt joint with the top of the sending tank, and the bottom of the sending tank is communicated with the air supply pipe in a sealing mode.

The magnetic field press comprises a die, an upper beam, a lower beam, an upper die punch and a lower die punch; guide rods are vertically arranged on the left side and the right side between the upper beam and the lower beam, and the upper stamping and the lower stamping are respectively driven by an upper electric driving mechanism and a lower electric driving mechanism; the upper electric driving mechanism comprises an upper guide plate, an upper nut, an upper screw rod and an upper motor, wherein a central hole is vertically formed in the upper beam, the upper nut is fixedly arranged in the central hole of the upper beam through a bearing sleeve, the upper end of the upper nut extends out of the upper beam, the upper motor drives the upper nut to rotate through gear transmission, the lower end of the upper screw rod extends out of the upper beam and is vertically connected with the upper guide plate, the left end and the right end of the upper guide plate vertically penetrate through guide rods, and an upper punch is fixed on the lower end face of the upper guide plate; the lower electric driving mechanism comprises a lower guide plate, a lower nut, a lower screw rod and a lower motor, wherein a central hole is vertically formed in the lower beam, the lower nut is fixedly arranged in the central hole of the lower beam through a bearing sleeve, the lower end of the lower nut extends out of the lower beam, the lower motor drives the lower nut to rotate through gear transmission, the upper end of the lower screw rod extends out of the lower beam and is vertically connected with the lower guide plate, the left end and the right end of the lower guide plate vertically penetrate through guide rods, and the lower punch is fixed on the upper end face of the lower guide plate.

The packaging mechanism comprises a sealed cabin, a vacuum packaging machine is arranged in the sealed cabin, the vacuum packaging machine comprises a vacuum chamber base, a vacuum chamber upper cover and a vacuum pumping pipe, a groove serving as a vacuum chamber is formed in the upper end face of the vacuum chamber base, one side edge of the vacuum chamber upper cover is hinged with the bottom of the sealed cabin, one end of the vacuum pumping pipe is inserted into the vacuum chamber in a sealed mode, and the other end of the vacuum pumping pipe is connected with the vacuum pump.

The feeding mechanism comprises an electric cylinder sliding table which is driven by an electric cylinder to move horizontally, a feeding guide plate provided with a feed opening, a feeding barrel positioned on the feeding guide plate, two pressure rods and two tensioning springs or tensioning cylinders; the feeding guide plate is positioned above a die of the magnetic field press, a feed opening on the feeding guide plate is aligned with an inlet of the die, and the length of the feeding guide plate extends to the lower part of the material weighing machine; the shape and the size of the inner cavity of the feeding cylinder are the same as those of the inner cavity of the die; two pressure rods are respectively positioned at two sides of the charging barrel, one end of one pressure rod is hinged with one side of the electric cylinder sliding table, the other end of the pressure rod is hinged with one side of the charging barrel, one end of one tensioning spring or tensioning cylinder is hinged with one side of the electric cylinder sliding table, and the other end of the tensioning spring or tensioning cylinder is hinged with the middle part of one pressure rod; one end of another pressure lever is hinged with the other side of the electric cylinder sliding table, the other end of the pressure lever is hinged with the other side of the feeding cylinder, one end of another tensioning spring or tensioning cylinder is hinged with the other side of the electric cylinder sliding table, and the other end of the other tensioning spring or tensioning cylinder is hinged with the middle part of the other pressure lever, so that the pressure lever and the tensioning spring or the tensioning cylinder tightly press the feeding cylinder on the feeding guide plate, and meanwhile, the feeding cylinder reciprocates between the lower part of the material weighing machine and the right upper part of the die under the driving of the electric cylinder sliding table to finish the feeding process.

The utility model improves the structure of the existing magnetic field press equipment, so that the equipment is more convenient to operate, is safer and more reliable to use, has more reasonable structure, improves the control precision and reduces the energy consumption.

Drawings

FIG. 1 is a schematic structural diagram of a conventional magnetic field press apparatus;

FIG. 2 is a schematic structural view of the magnetic field press apparatus of the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 2;

FIG. 4 is a second enlarged view of a portion of FIG. 2;

FIG. 5 is a three enlarged partial view of FIG. 2;

FIG. 6 is a fourth enlarged view of a portion of FIG. 2;

FIG. 7 is a five enlarged view of a portion of FIG. 2;

FIG. 8 is a schematic structural view of a vacuum packaging machine;

FIG. 9 is a top view of FIG. 8;

FIG. 10 is a schematic view showing a state of use of the vacuum packaging machine;

FIG. 11 is a second schematic view of the vacuum packaging machine in use;

FIG. 12 is a third schematic view of the vacuum packaging machine in use.

In the figure: 1-charging bucket, 2-weighing machine, 3-vibrating feeder, 4-mould, 5-upper beam, 6-lower beam, 7-upper punch, 8-lower punch, 9-filtering receiving device, 91-cyclone separator, 92-filter, 10-vibrating screen, 101-spring, 102-sieve hopper, 103-sieve mesh, 104-fine material guide tube, 11-sending tank, 12-blower, 13-blast pipe, 14-return air pipe, 15-electric cylinder, 16-electric cylinder sliding table, 17-feeding guide plate, 18-feeding cylinder, 19-pressure rod, 20-tension spring or tension cylinder, 21-guide rod, 22-upper guide plate, 23-upper nut, 24-upper screw rod, 25-upper motor, 26-lower guide plate, 27-lower screw, 28-lower screw rod, 29-lower motor, 30-vacuum chamber base, 31-groove (vacuum chamber), 32-vacuum chamber upper cover, 33-vacuum tube, 34-sealing ring, 35-hinged seat, 36-connecting rod, 37-heat sealing strip, 38-silicon rubber strip, 39-vertically lifting cylinder and 40-torsion return spring.

Detailed Description

A magnetic field press device comprises a feeding mechanism, a magnetic field press and a packaging mechanism;

the feeding mechanism comprises a charging bucket 1 and a material weighing machine 2, and further comprises a filtering receiving device 9 and a vibrating screen 10 (as shown in fig. 4, the vibrating screen is a purchased existing product and comprises a screen hopper 102 which is supported by a spring 101 and driven to vibrate, an inlet of the screen hopper 102 is used as a feeding port of the vibrating screen, a screen 103 is arranged in the screen hopper, an outlet of the screen hopper 102 is connected with a section of fine material guide pipe 104, and a free end of the fine material guide pipe 104 is used as a discharging port of the vibrating screen, particulate matters screened by the screen 103 are discharged from the side wall of the screen hopper along with the vibration of the screen hopper), the sending tank 11 and a fan 12 are arranged, and the filtering receiving device 9 comprises a cyclone separator 91 and a filter 92; the cyclone separator 91 and the vibrating screen 10 are positioned above the material weighing machine 2, the discharge port of the cyclone separator 91 is butted with the feed port of the vibrating screen 10, the air inlet pipe orifice of the cyclone separator 91 is connected with the air outlet of the fan 12 through the blast pipe 13, the air return pipe orifice of the cyclone separator 91 is connected with the inlet of the filter 92 through the air return pipe 14, and the outlet of the filter 92 is connected with the air inlet of the fan 12 through the air return pipe 14; the discharge port of the vibrating screen 10 is connected with the material weighing machine 2; the sending tank 11 is arranged at a position lower than the material weighing machine 2 (usually supported on a supporting surface of a magnetic field press, namely the ground), the charging bucket 1 is butted with the top of the sending tank 11, and the bottom of the sending tank 11 is in sealed communication with the blast pipe 13. Like this, material jar 1 is arranged in lower position, and the manual work of being convenient for docks, and convenient operation eliminates the potential safety hazard. The magnetic powder in the charging bucket 1 falls into the sending tank 11, then falls into the blast pipe 13 through the sending tank 11, is blown into the cyclone separator 91, then is filtered by the vibrating screen 10 to remove coarse particles, falls into the material weighing machine 2, and finally falls into the feeding mechanism according to the amount to complete the feeding process.

The feeding mechanism comprises an electric cylinder sliding table 16 which is driven by an electric cylinder 15 to move horizontally, a feeding guide plate 17 with a feed opening, a feeding barrel 18 positioned on the feeding guide plate 17, two pressure rods 19 and two tensioning springs or tensioning cylinders 20; the feeding guide plate 17 is positioned above the die 4 of the magnetic field press (in practice, the feeding guide plate 17 may be directly fixed on the die 4 as shown in fig. 2 and 5, or fixed with other parts of the magnetic field press or the feeding mechanism) and has a feeding port aligned with the inlet of the die 4, and the length of the feeding guide plate 17 extends to below the weighing machine 2; the shape and the size of the inner cavity of the charging barrel 18 are the same as those of the inner cavity of the die 4; two pressure levers 19 are respectively positioned at two sides of the charging barrel 18, one end of one pressure lever 19 is hinged with one side of the electric cylinder sliding table 16, the other end is hinged with one side of the charging barrel 18, one end of one tensioning spring or tensioning cylinder 20 is hinged with one side of the electric cylinder sliding table 16, and the other end is hinged with the middle part of one pressure lever 19; one end of another pressure lever 19 is hinged with the other side of the electric cylinder sliding table 16, the other end of the another pressure lever 19 is hinged with the other side of the feeding cylinder 18, one end of another tensioning spring or tensioning cylinder 20 is hinged with the other side of the electric cylinder sliding table 16, and the other end of the another tensioning spring or tensioning cylinder 20 is hinged with the middle part of the another pressure lever 19, so that the pressure lever 19 and the tensioning spring or tensioning cylinder 20 tightly press the feeding cylinder 18 on the feeding guide plate 17, and meanwhile, the feeding cylinder 18 reciprocates between the lower part of the material weighing machine 2 (at this time, the feeding cylinder 18 receives the magnetic powder falling from the material weighing machine 2) and the right upper part of the mold 4 (at this time, the magnetic powder in the feeding cylinder 18 falls into the mold 4 through a discharging opening on the feeding guide plate 17) under the driving of the electric cylinder sliding table 16, and the feeding process is completed. Because the shape and the size of the inner cavity of the feeding cylinder 18 are matched with the shape and the size of the inner cavity of the die 4, the magnetic powder in the feeding cylinder 18 can smoothly fall into the die 4.

The magnetic field press comprises a die 4, an upper beam 5, a lower beam 6, an upper punch 7 and a lower punch 8; guide rods 21 (two guide rods distributed in front and back at the left and right sides in specific implementation) are vertically arranged at the left and right sides between the upper beam 5 and the lower beam 6, and the upper punch 7 and the lower punch 8 are respectively driven by an upper electric driving mechanism and a lower electric driving mechanism; the upper electric drive mechanism comprises an upper guide plate 22, an upper nut 23, an upper screw rod 24 and an upper motor 25, wherein a central hole is vertically formed in the upper beam 5, the upper nut 23 is fixedly arranged in the central hole of the upper beam 5 through a bearing sleeve, the upper end of the upper nut 23 extends out of the upper beam 5, the upper motor 25 drives the upper nut 23 to rotate through gear transmission, the lower end of the upper screw rod 24 extends out of the upper beam 5 to be vertically connected with the upper guide plate 22, the left side and the right side of the upper guide plate 22 are vertically penetrated through by guide rods 21, and the upper punch 7 is fixed on the lower end face of the upper guide plate 22. When the upper die punch 7 works, the upper motor 25 drives the upper screw 23 (the part extending out of the upper beam) to rotate through gear transmission to drive the upper screw rod 24 to move up and down, so that the upper die punch 7 is driven, and the guide rod 21 guides the upper guide plate 22 to overcome the torque of the upper screw rod 24, so that the upper screw rod 24 only can move up and down. In specific implementation, the upper nut 23 is sleeved with a centripetal thrust bearing, a deep groove bearing and a thrust bearing from bottom to top respectively so as to restrict the stress of the upper nut 23. The lower electric driving mechanism comprises a lower guide plate 26, a lower nut 27, a lower screw rod 28 and a lower motor 29, wherein a lower beam 6 is vertically provided with a central hole, the lower nut 27 is fixedly arranged in the central hole of the lower beam 6 through a bearing sleeve, the lower end of the lower nut 27 extends out of the lower beam 6, the lower motor 29 drives the lower nut 27 to rotate through gear transmission, the upper end of the lower screw rod 28 extends out of the lower beam 6 to be vertically connected with the lower guide plate 26, the left side and the right side of the lower guide plate 26 are vertically penetrated through by guide rods 21, and a lower punch 8 is fixed on the upper end surface of the lower guide plate 26. In specific implementation, the lower nut 27 is sleeved with a radial thrust bearing, a deep groove bearing and a thrust bearing from top to bottom.

The packaging mechanism comprises a sealed cabin, a vacuum packaging machine is arranged in the sealed cabin, the vacuum packaging machine comprises a vacuum chamber base 30, a vacuum chamber upper cover 32 and a vacuum-pumping pipe 33, a groove 31 serving as a vacuum chamber is formed in the upper end face of the vacuum chamber base 30, one side edge of the vacuum chamber upper cover 32 is hinged with the bottom of the sealed cabin, one end of the vacuum-pumping pipe 33 is inserted into the vacuum chamber in a sealed mode, and the other end of the vacuum-pumping pipe 33 is connected with a vacuum pump. When the vacuum bag is used, the blank after orientation forming is placed into the plastic bag, the opening part of the plastic bag is placed in a vacuum cavity (the rest is outside the vacuum cavity), the upper cover 32 of the vacuum cavity is pressed downwards, the vacuum cavity is vacuumized through the vacuum pumping tube 33, then the vacuum pumping in the plastic bag is completed, and then the plastic bag is sealed, so that the packaging of the blank is completed. Because the volume of the vacuum cavity is very small, the vacuum pump can quickly reach the vacuum degree, the efficiency is improved, and the energy consumption is reduced; the vacuum cavity and the upper cover are small in size, and the operation is convenient for workers. In specific implementation, a sealing ring 34 surrounding the vacuum chamber is arranged on the contact surface of the vacuum chamber upper cover 32 and the vacuum chamber base 30 to increase the sealing performance of the vacuum chamber. The bottom of the sealed cabin is provided with a hinge seat 35, a connecting rod 36 is fixed on the back surface (not the contact surface with the vacuum chamber base) of the vacuum chamber upper cover 32, and one end of the connecting rod 36 is hinged with the hinge seat 35, so that the hinge of one side edge of the vacuum chamber upper cover 32 and the bottom of the sealed cabin is realized. The connecting rod 36 is provided with a torsion return spring 40 at the hinge with the hinge seat 35 for the upturned return of the vacuum chamber upper cover 32. The front edge (the side where the plastic bag opening is placed) of the upper end face of the vacuum chamber base 30 is provided with a heat sealing strip 37, the vacuum chamber upper cover 32 is provided with a silicon rubber strip 38 which is opposite to the heat sealing strip 37, and the sealing of the plastic bag is realized through the clamping of the heat sealing strip 37 and the silicon rubber strip 38 and the heating of the heat sealing strip 37.

The capsule also includes a platform supported by vertically elevating cylinders 39. The existing magnetic field press equipment uses a gas claw to clamp a blank, places the blank on a horizontal conveying belt, and moves to the hand of an operator; because the equipment is higher, the operation worker needs to stand on a higher platform to operate, and certain danger exists. The platform supported by the vertically lifting cylinder 39 is additionally arranged, the blank is placed on the platform, the height of the blank is reduced, a person can stand on the ground for operation, the safety is good, and the occupied area is saved.

Claims (10)

1. A magnetic field press device comprises a feeding mechanism, a magnetic field press and a packaging mechanism;

the feeding mechanism comprises a charging bucket (1) and a weighing machine (2), and is characterized by further comprising a filtering and receiving device (9), a vibrating screen (10), a sending bucket (11) and a fan (12), wherein the filtering and receiving device (9) comprises a cyclone separator (91) and a filter (92); the cyclone separator (91) and the vibrating screen (10) are positioned above the material weighing machine (2), the discharge hole of the cyclone separator (91) is butted with the feed inlet of the vibrating screen (10), the air inlet pipe orifice of the cyclone separator (91) is connected with the air outlet of the fan (12) through the blast pipe (13), the air return pipe orifice of the cyclone separator (91) is connected with the inlet of the filter (92) through the air return pipe (14), and the outlet of the filter (92) is connected with the air inlet of the fan (12) through the air return pipe (14); the discharge outlet of the vibrating screen (10) is connected with the material weighing machine (2); the sending tank (11) is arranged at a position lower than the material weighing machine (2), the material tank (1) is in butt joint with the top of the sending tank (11), and the bottom of the sending tank (11) is communicated with the blast pipe (13) in a sealing mode.

2. A magnetic field press apparatus according to claim 1, characterized in that the routing tank (11) is supported on the ground, the support surface of the magnetic field press.

3. A magnetic field press apparatus according to claim 1, characterized in that the magnetic field press comprises a die (4), an upper beam (5), a lower beam (6), an upper punch (7), a lower punch (8); guide rods (21) are vertically arranged on the left side and the right side between the upper beam (5) and the lower beam (6), and the upper stamping (7) and the lower stamping (8) are respectively driven by an upper electric driving mechanism and a lower electric driving mechanism;

the upper electric drive mechanism comprises an upper guide plate (22), an upper nut (23), an upper screw rod (24) and an upper motor (25), a central hole is vertically formed in the upper beam (5), the upper nut (23) is fixedly arranged in the central hole of the upper beam (5) through a bearing sleeve, the upper end of the upper nut (23) extends out of the upper beam (5), the upper motor (25) drives the upper nut (23) to rotate through gear transmission, the lower end of the upper screw rod (24) extends out of the upper beam (5) and is vertically connected with the upper guide plate (22), the left end and the right end of the upper guide plate (22) are vertically penetrated through by the guide rod (21), and the upper die punch (7) is fixed on the lower end face of the upper guide plate (22);

the lower electric driving mechanism comprises a lower guide plate (26), a lower nut (27), a lower screw rod (28) and a lower motor (29), wherein a central hole is vertically formed in the lower beam (6), the lower nut (27) is fixedly arranged in the central hole of the lower beam (6) through a bearing sleeve, the lower end of the lower nut (27) extends out of the lower beam (6), the lower motor (29) drives the lower nut (27) to rotate through gear transmission, the upper end of the lower screw rod (28) extends out of the lower beam (6) and is vertically connected with the lower guide plate (26), the left end and the right end of the lower guide plate (26) are vertically penetrated through guide rods (21), and a lower punch (8) is fixed on the upper end face of the lower guide plate (26).

4. The magnetic field press apparatus according to claim 3, characterized in that the upper nut (23) is sleeved with a radial thrust bearing, a deep groove bearing, a thrust bearing from bottom to top, respectively; the lower nut (27) is respectively sleeved with a centripetal thrust bearing, a deep groove bearing and a thrust bearing from top to bottom.

5. The magnetic field press equipment according to claim 1 or 3, characterized in that the encapsulating mechanism comprises a sealed cabin, a vacuum encapsulating machine is arranged in the sealed cabin, the vacuum encapsulating machine comprises a vacuum chamber base (30), a vacuum chamber upper cover (32) and a vacuum tube (33), a groove (31) serving as a vacuum chamber is formed in the upper end face of the vacuum chamber base (30), one side edge of the vacuum chamber upper cover (32) is hinged with the bottom of the sealed cabin, one end of the vacuum tube (33) is hermetically inserted into the vacuum chamber, and the other end of the vacuum tube is connected with a vacuum pump.

6. A magnetic field press apparatus as claimed in claim 5 characterised in that the capsule further comprises a platform supported by the vertically elevating cylinder (39).

7. The magnetic field press equipment according to claim 6 is characterized in that the bottom of the sealed cabin is provided with a hinge seat (35), the back of the vacuum chamber upper cover (32) is fixed with a connecting rod (36), and one end of the connecting rod (36) is hinged with the hinge seat (35); a torsion return spring (40) is arranged at the hinged position of the connecting rod (36) and the hinged seat (35); a sealing ring (34) surrounding the vacuum cavity is arranged on the contact surface of the vacuum chamber upper cover (32) and the vacuum chamber base (30).

8. A magnetic field press apparatus as claimed in claim 7, characterised in that the front edge of the upper end face of the vacuum chamber base (30) is provided with a heat seal strip (37) and the vacuum chamber upper cover (32) is provided with a silicone rubber strip (38) located opposite the heat seal strip (37).

9. A magnetic field press apparatus according to claim 1 or 3, characterized in that the feeding mechanism comprises an electric cylinder slide (16) driven by an electric cylinder (15) to move horizontally, a feeding guide plate (17) with a feed opening, a feeding cylinder (18) on the feeding guide plate (17), two press rods (19), two tension springs or tension cylinders (20); the feeding guide plate (17) is positioned above a die (4) of the magnetic field press, a feed opening on the feeding guide plate is aligned with an inlet of the die (4), and the length of the feeding guide plate (17) extends to the position below the material weighing machine (2); the shape and the size of the inner cavity of the feeding barrel (18) are the same as those of the inner cavity of the die (4); two pressure levers (19) are respectively positioned at two sides of the charging barrel (18), one end of one pressure lever (19) is hinged with one side of the electric cylinder sliding table (16), the other end of the other pressure lever is hinged with one side of the charging barrel (18), one end of one tension spring or tension cylinder (20) is hinged with one side of the electric cylinder sliding table (16), and the other end of the tension spring or tension cylinder is hinged with the middle part of the one pressure lever (19); one end of another pressure lever (19) is hinged with the other side of the electric cylinder sliding table (16), the other end of the another pressure lever is hinged with the other side of the feeding cylinder (18), one end of another tensioning spring or tensioning cylinder (20) is hinged with the other side of the electric cylinder sliding table (16), and the other end of the another tensioning spring or tensioning cylinder (20) is hinged with the middle of the another pressure lever (19), so that the pressure lever (19) and the tensioning spring or tensioning cylinder (20) press the feeding cylinder (18) on the feeding guide plate (17), and meanwhile, the feeding cylinder (18) is driven by the electric cylinder sliding table (16) to reciprocate between the lower part of the material weighing machine (2) and the right upper part of the die (4), and the feeding process is completed.

10. A magnetic field press apparatus according to claim 5, characterized in that the feeding mechanism comprises an electric cylinder slide (16) driven by an electric cylinder (15) to move horizontally, a feeding guide plate (17) with a feed opening, a feeding cylinder (18) on the feeding guide plate (17), two pressing rods (19), two tension springs or tension cylinders (20); the feeding guide plate (17) is positioned above a die (4) of the magnetic field press, a feed opening on the feeding guide plate is aligned with an inlet of the die (4), and the length of the feeding guide plate (17) extends to the position below the material weighing machine (2); the shape and the size of the inner cavity of the feeding barrel (18) are the same as those of the inner cavity of the die (4); two pressure levers (19) are respectively positioned at two sides of the charging barrel (18), one end of one pressure lever (19) is hinged with one side of the electric cylinder sliding table (16), the other end of the other pressure lever is hinged with one side of the charging barrel (18), one end of one tension spring or tension cylinder (20) is hinged with one side of the electric cylinder sliding table (16), and the other end of the tension spring or tension cylinder is hinged with the middle part of the one pressure lever (19); one end of the other compression bar (19) is hinged with the other side of the electric cylinder sliding table (16), the other end of the other compression bar is hinged with the other side of the feeding cylinder (18), one end of the other tensioning spring or tensioning cylinder (20) is hinged with the other side of the electric cylinder sliding table (16), and the other end of the other tensioning spring or tensioning cylinder (20) is hinged with the middle of the other compression bar (19), so that the feeding cylinder (18) is pressed on the feeding guide plate (17) by the compression bar (19) and the tensioning spring or tensioning cylinder (20), and meanwhile, the feeding cylinder (18) is driven by the electric cylinder sliding table (16) to reciprocate between the lower part of the material weighing machine (2) and the right above the mold (4), and the feeding process is completed.

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