Motor assembly and vacuum electromagnetic valve for die-casting die

Abstract

The motor assembly comprises a valve body, the motor assembly arranged in the valve body and a sealing rod stator driven by the motor assembly, the motor assembly comprises a first magnet and a second magnet, the first magnet is cylindrical, the second magnet is cylindrical and surrounds the periphery of the first magnet, and the sealing rod stator is arranged in the valve body. A magnetic field space is formed between the first magnet and the second magnet; the rotor comprises a cylinder body part located between the first magnet and the second magnet, a left end connecting part arranged at the left end of the cylinder body part and a coil wound on the periphery of the cylinder body part; a first runner is arranged in the first magnet; a third cooling cavity is formed between the left end of the first magnet and the left end connecting part, a plurality of first through holes extending in the radial direction are formed in the cylinder part, and the third cooling cavity and the space outside the cylinder part are communicated through the first through holes. The vacuum-pumping efficiency is high, the gas displacement is large, the valve body opening and closing response speed is high, and the vacuum-pumping requirement of the high-precision time control die-casting process can be met.

Description

Technical Field

[0001] The invention belongs to the technical field of vacuum valves, and in particular relates to a vacuum solenoid valve for a motor component and a die-casting mold. Background Art

[0002] The die-casting machine is a device that cooperates with the mold to complete the production of metal castings such as copper, magnesium, zinc, and aluminum. In order to complete the die-casting of metal castings such as copper, magnesium, zinc, and aluminum and ensure the quality of the products, it is necessary to ensure that the air in the matching mold can be discharged smoothly. Therefore, a vacuum valve must be installed on the die-casting machine mold to cooperate with a vacuum compressor to discharge the air in the mold. There are generally three types of vacuum valves used in the die-casting industry: exhaust plate, mechanical valve, and hydraulic valve.

[0003] (1) Cooling exhaust plate: Its principle is to use metal cooling to solidify the casting alloy; its advantages are low cost and simple use; its disadvantages are small vacuum cross-sectional area and poor exhaust effect.

[0004] (2) Mechanical valve: Its principle is to use the dynamic impact force of the metal liquid to close the valve core; its advantages are large exhaust volume and good vacuum effect; its disadvantages are complex processing and high manufacturing cost; there are wearing parts, high cost of use, high failure rate and troublesome maintenance.

[0005] (3) Hydraulic valve: Its principle is to use the time or stroke signal given by the equipment to close; its advantages are large exhaust volume, simple manufacturing and reliable use; its disadvantages are that the mechanical and electrical reactions take time, so it needs to be closed in advance, and exhaust cannot be completed until the casting filling is completed.

[0006] Patent CN211667244U in the prior art proposes a die-casting mold vacuum valve, which uses the rotation of the motor output shaft to drive the push rod to rotate. The push rod pushes the spherical surface to advance in the direction of the mold exhaust hole interface, and the spherical surface advances the blocking plate through the connecting rod. At this time, the metal liquid is blocked in the V-shaped groove by the blocking plate and the block. The structure of the vacuum valve cannot tell how the push rod is connected to the motor output shaft and how it pushes the spherical surface and the connecting rod. Therefore, it is impossible to achieve fast and efficient horizontal movement of the blocking plate.

[0007] Therefore, it is necessary to provide a new motor assembly and a vacuum solenoid valve for a die-casting mold to solve the above technical problems. Summary of the invention

[0008] The main purpose of the present invention is to provide a vacuum solenoid valve for a motor assembly and a die-casting mold, which has high vacuuming efficiency, large exhaust volume, and fast valve body opening and closing response speed, and can meet the vacuuming requirements of the die-casting process with high-precision time control.

[0009] The present invention achieves the above-mentioned object through the following technical solution: a motor assembly, comprising: The stator comprises a first magnet and a second magnet, wherein the first magnet is cylindrical, the second magnet is tubular and surrounds the first magnet, and a magnetic field space is formed between the first magnet and the second magnet; The mover comprises a cylindrical portion extending from the left end into between the first magnet and the second magnet, a left end connecting portion arranged at the left end of the cylindrical portion, and a plurality of coils wound around the outer circumference of the cylindrical portion; A first flow channel is provided in the first magnet and axially passes through the left and right ends; a third cooling cavity is formed between the left end of the first magnet and the left end connecting portion, and a plurality of radially extending first through holes are provided on the cylindrical portion, and the first through holes connect the third cooling cavity with the space outside the cylindrical portion.

[0010] The present invention further provides a vacuum solenoid valve, comprising a valve body, a motor assembly as described above and arranged in the valve body, and a sealing rod driven by the motor assembly to telescopically move in the valve body.

[0011] Furthermore, a molding area constituting part or all of the die-casting molding cavity is provided on the left side surface of the valve body, and a telescopic channel connected to the surface of the molding area and a vacuum channel connected to the telescopic channel are provided inside, and the vacuum channel is connected to a vacuum extraction device; an exhaust port is provided in the molding area; an axial rod connecting block is fixedly provided on the left end connecting portion, one end of the sealing rod is fixed on the axial rod connecting block and the other end extends close to the molding area; the sealing rod is driven by the motor assembly to move in the telescopic channel to block or open the exhaust port, thereby blocking or opening the vacuum channel and the die-casting molding cavity.

[0012] Furthermore, the valve body includes a mold block, an insulation block, a valve seat and an end cover which are arranged in sequence from left to right; the telescopic channel and the vacuum channel are arranged in the mold block, and the motor assembly is arranged in the valve seat.

[0013] Furthermore, a first cooling cavity is provided in the valve seat, a second cooling cavity is formed around the end cover and the valve seat, and the first cooling cavity and the second cooling cavity are respectively located on the left and right sides of the stator; the left end of the first flow channel is connected to the third cooling cavity, and the right end is connected to the second cooling cavity; the first through hole connects the third cooling cavity with the first cooling cavity; the end cover is provided with a first cooling inlet and outlet connected to the second cooling cavity, and the valve seat is provided with a second cooling inlet and outlet connected to the first cooling cavity; the first cooling inlet and outlet and the second cooling inlet and outlet are connected to the cooling device.

[0014] Furthermore, a plurality of axially penetrating second through holes are provided on the left end connecting portion, one end of the second through hole is connected to the third cooling cavity, and the other end is aligned with the end surface of the shaft connecting block.

[0015] Furthermore, a first mounting hole is provided in the valve seat at one end close to the end cover; the first magnet of the stator is installed in the first mounting hole by interference fit, and a second sealing ring is provided on the interface where the valve seat and the end cover are fitted to seal the assembly gap between the two.

[0016] Furthermore, a second mounting hole is provided in the valve seat at one end close to the insulation block; the shaft rod connecting block passes through the second mounting hole for axial movement, and a first supporting sleeve is installed in the second mounting hole to guide the axial movement of the shaft rod connecting block, a third sealing ring is provided between the shaft rod connecting block and the first supporting sleeve, and a fourth sealing ring is provided between the first supporting sleeve and the second mounting hole.

[0017] Furthermore, a clamping cover for axially compressing the first supporting sleeve in the second mounting hole is provided at the left end of the valve seat, and the clamping cover is fixedly connected to the valve seat by a first screw.

[0018] Furthermore, a sealing threading assembly is provided on the top of the valve seat for facilitating threading; the sealing threading assembly includes a threading hole extending through a first cooling cavity inside the valve seat and a plurality of fifth sealing rings colinearly arranged within the length section of the threading hole.

[0019] Furthermore, the sealing threading assembly also includes a threading mounting plate and a threading sealing pressure plate, the threading mounting plate is installed on the top of the valve seat, and a sixth sealing ring is provided on the interface with the valve seat to seal the assembly gap between the two; the threading hole is opened on the threading mounting plate, and a sealing ring mounting groove is provided on the threading mounting plate at the top of the threading hole, the fifth sealing ring is installed in the sealing ring mounting groove, the threading sealing pressure plate is fixed to the top of the threading mounting plate by a second screw, and a pressure ring is provided on the lower surface of the threading sealing pressure plate to press the fifth sealing ring downward.

[0020] Furthermore, a second guide sleeve for guiding the axial movement of the sealing rod and a seventh sealing ring for sealing the gap between the right end of the telescopic channel and the sealing rod are arranged in the mold core block.

[0021] Furthermore, a hollow structure is provided inside the insulation block, and the air in the hollow structure forms an air insulation layer.

[0022] Furthermore, the mold block, the insulation block, the valve seat and the end cover are fixedly connected together by a plurality of third screws. The third screws are inserted from the end cover end, pass through the valve seat and the insulation block in sequence, and are screwed into the threaded hole in the mold block; the valve body is fixedly mounted on the die-casting mold by a plurality of fourth screws pointing vertically downward.

[0023] Furthermore, the shaft rod connecting block and the left end connecting part are fixedly connected together by a fifth screw; the fifth screw is inserted from the end of the shaft rod connecting block, passes through the shaft rod connecting block and is screwed into the threaded hole on the left end connecting part; a receiving groove is provided on the surface of one side of the shaft rod connecting block facing the shaft rod connecting block, and a sealing sleeve covering the outer periphery of the fifth screw is provided in the receiving groove.

[0024] Compared with the prior art, the vacuum solenoid valve for a motor assembly and a die-casting mold of the present invention has the following beneficial effects: high vacuuming efficiency, large exhaust volume, fast response speed of valve body opening and closing, and can meet the vacuuming requirements of the die-casting process with high-precision time control. Specifically: (1) The same working principle as the hydraulic valve is adopted, and the time or stroke signal given by the equipment is used to close the valve body, which gives priority to large exhaust volume, reliable use, and high vacuum efficiency; but at the same time, the valve body closing action (i.e. the telescopic movement of the sealing rod) is driven by a motor. Compared with the hydraulic cylinder drive, it does not require a long mechanical and electrical reaction time, has a fast response speed, and has high time control accuracy; (2) A motor assembly is cleverly designed and directly embedded inside the valve body, realizing direct drive of the sealing rod. After the motor assembly is powered on, the valve body can be closed or opened at a fast speed. The electronic assembly adopts a stator and a mover structure. A ring-shaped magnetic field space is formed in the stator. The mover is designed as a cylinder structure and extends into the magnetic field space. A coil is wound around the outer periphery of the cylinder. When the coil is powered on, the axis of the mover can be moved. The sealing rod is fixed on the mover, and the motor assembly can drive the sealing rod to extend and retract, thereby opening or closing the valve body. The entire motor structure is compact, occupies little space, and is easy to install. (3) The valve body is designed to be composed of a mold block, a heat insulation block, a valve seat and an end cover structure. The motor assembly is installed in the valve seat. The heat insulation block is used to isolate the mold block and the valve seat, thereby reducing the transfer speed of heat from the mold block to the valve seat end and reducing the impact of high temperature on the operation of the motor assembly. At the same time, the heat insulation block adopts an internal hollow structure to form an air insulation layer, which further improves the insulation effect. (4) A first cooling cavity is designed inside the valve seat, a second cooling cavity is designed between the valve seat and the end cover, and a third cooling cavity is formed by the space between the inner wall of the left end of the stator and the left end of the mover; at the same time, an axially penetrating cooling channel is designed in the center of the stator of the motor assembly, and a radially penetrating first through hole is designed on the mover. The second cooling cavity and the third cooling cavity are connected by the cooling channel, and the third cooling cavity and the first cooling cavity are connected by the first through hole, so that a cooling pipe system flowing through the motor assembly is formed inside the valve body. The cooling pipe system is connected to an external cooling device, which can effectively cool the motor assembly and ensure that the motor assembly can operate normally in a high-temperature die-casting mold and has a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the assembled three-dimensional structure of an embodiment of the present invention; Figure 2 It is a schematic diagram of the explosion structure of an embodiment of the present invention; Figure 3 It is a schematic cross-sectional structure diagram of the vacuum solenoid valve of an embodiment of the present invention when it is opened; Figure 4 is a schematic cross-sectional structure diagram of a vacuum solenoid valve when it is closed according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the cross-sectional structure of the first cooling inlet and outlet on the end cover in an embodiment of the present invention; Figure 6 Schematic diagram of the assembly structure of the motor assembly and the sealing rod in an embodiment of the present invention; Figure 7 It is a schematic diagram of the exploded structure of the motor assembly and the sealing rod in an embodiment of the present invention; Figure 8 It is a schematic diagram of the assembled cross-sectional structure of the motor assembly and the sealing rod in an embodiment of the present invention; Fig. 9 It is a schematic diagram of the exploded structure of the sealing threading assembly in an embodiment of the present invention; Fig.10 It is a schematic diagram of the assembly cross-sectional structure of the sealing threading assembly in an embodiment of the present invention; Fig.11 It is a schematic diagram of the cross-sectional structure of the third cooling inlet and outlet on the heat insulation block in an embodiment of the present invention; Fig.12 It is a schematic cross-sectional structure diagram of the connection between the shaft connecting block and the motor assembly in an embodiment of the present invention; The numbers in the figure represent: 100-vacuum solenoid valve; 1-valve body, 11-molding area, 12-telescopic channel, 13-vacuum channel, 14-mold core block, 15-insulation block, 151-hollow structure, 152-avoidance perforation, 153-avoidance slot, 154-third cooling inlet and outlet, 16-valve seat, 161-second cooling inlet and outlet, 162-first mounting hole, 163-second mounting hole, 17-end cover, 171-first cooling inlet and outlet, 18-first cooling cavity, 19-second cooling cavity, 110-third cooling cavity, 111-second sealing ring, 112-first supporting sleeve, 113-third sealing ring, 114-fourth sealing ring, 115-pressing cover, 116-first screw, 117-second guide sleeve, 118-seventh sealing ring, 119-exhaust port; 2-motor assembly, 21-stator, 211-first magnet, 2111-first flow channel, 212-second magnet, 213-right end connection part, 214-magnetic field space, 22-mover, 221-cylinder part, 2211-annular groove, 2212-first through hole, 222-left end connection part, 2221-second through hole, 23-shaft rod connection block, 231-storage groove, 232-sealing sleeve, 233-eighth sealing ring, 24-fifth screw; 3- Sealing rod; 4-seal threading assembly, 41-threading hole, 42-fifth sealing ring, 43-threading installation plate, 44-threading sealing pressure plate, 441-pressing ring part, 45-sixth sealing ring, 46-sealing ring installation groove, 47-second screw, 48-sixth screw; 5-the third screw; 6-the fourth screw; 7-the lifting ring. DETAILED DESCRIPTION

[0026] Embodiment 1: Please refer to Figure 1-Figure 12 The present embodiment is a vacuum solenoid valve 100 for a die-casting mold, which includes a valve body 1, a motor assembly 2 disposed in the valve body 1, and a sealing rod 3 driven by the motor assembly 2 to telescopically move in the valve body 1.

[0027] A molding area 11 constituting a part or all of the die-casting molding cavity is arranged on the left side surface of the valve body 1, and a telescopic channel 12 connected to the surface of the molding area and a vacuum channel 13 connected to the telescopic channel 12 are arranged inside, and the vacuum channel 13 is connected to an external vacuum extraction device (not marked in the figure); an exhaust port 119 is arranged in the molding area 11; the sealing rod 3 is driven by the motor assembly 2 to move in the telescopic channel 12 to block or connect the exhaust port 119, thereby blocking or connecting the vacuum channel 13 and the die-casting molding cavity.

[0028] In this embodiment, when the sealing rod 3 moves to the right to the limit, the head of the sealing rod 3 blocks and seals the exhaust port from the inside of the die-casting cavity to ensure the sealing integrity of the die-casting cavity; when the sealing rod 3 moves to the left to the limit, the exhaust port is opened, the vacuum channel is connected to the die-casting cavity through the telescopic channel 12, and the die-casting cavity is vacuumed by the vacuum pumping device. In other embodiments, the sealing rod 3 can also be designed to open the exhaust port when it moves to the right to the limit, and to close the exhaust port when it moves to the left to the limit.

[0029] In order to achieve rapid response drive of the sealing rod 3, the present embodiment adopts the motor assembly 2 as the power source, which has a faster drive speed and higher time control accuracy than the hydraulic cylinder. In order to achieve telescopic drive of the sealing rod 3 by the motor assembly 2, a new motor assembly 2 structure is designed in the present embodiment. Specifically, the motor assembly 2 includes a stator 21 fixed on the valve body 1, a mover 22 that cooperates with the stator 21 and moves axially and horizontally in the valve body 1, and a shaft connecting block 23 fixed on the axial end face of the mover 22. One end of the sealing rod 3 is fixed on the shaft connecting block 23 and the other end extends close to the molding area 11. The stator 21 includes a first magnet 211, a second magnet 212, and a right end connecting portion 213 connecting the first magnet 211 and the second magnet 212 at the right end. The first magnet 211 is cylindrical, the second magnet 212 is cylindrical and is arranged around the periphery of the first magnet 211. The first magnet 211 and the second magnet 212 have opposite magnetic properties and a magnetic field space 214 is formed between the two. The magnetic field space 214 forms the activity space of the mover 22. The mover 22 includes a barrel portion 221 located between the first magnet 211 and the second magnet 212, a left end connecting portion 222 arranged at the left end of the barrel portion 221, and a plurality of coils (not marked in the figure) wound around the outer periphery of the barrel portion 221. An annular groove 2211 is arranged on the outer periphery of the barrel portion 221, and the coil is wound in the annular groove 2211. The cylinder part 221 of the mover 22 is located in the magnetic field space 214, and after the coil is energized, it is subjected to the magnetic field of the magnetic field space 214 to achieve axial telescopic movement. The shaft connecting block 23 is fixedly mounted on the left end connecting part 222.

[0030] The motor assembly 2 designed in this embodiment realizes a miniaturized design, and can be directly embedded in the valve body 1 and installed on the die-casting mold.

[0031] Since the overall temperature of the die-casting mold is relatively high during die-casting, in order to prevent the high temperature environment from affecting the normal operation of the motor assembly 2 and the service life of the motor assembly 2, the valve body 1 is optimized and configured with a cooling structure in this embodiment. Specifically, the valve body 1 includes a mold core block 14, an insulation block 15, a valve seat 16 and an end cover 17, which are arranged from left to right. The telescopic channel 12 and the vacuum channel 13 are arranged in the mold core block 14, and the motor assembly 2 is arranged in the valve seat 16. The mold core block 14 is in direct contact with the die-casting liquid and has a relatively high temperature. The insulation block 15 can effectively isolate the mold core block 14 and the valve seat 16, thereby ensuring that the motor assembly 2 installed in the valve seat 16 will not be affected by the high temperature of the mold core block 14.

[0032] Since the end of the sealing rod 3 extending into the molding area 11 is also in direct contact with the die casting liquid, the sealing rod 3 will also transfer a certain amount of heat to the end of the motor assembly 2. In order to ensure that the ambient temperature of the motor assembly 2 is not too high and to ensure its long service life, a cooling structure is provided in the valve seat 16 in this embodiment, and a cooling channel is also designed inside the motor assembly 2. Specifically: A first cooling chamber 18 is provided in the valve seat 16, and a second cooling chamber 19 is formed around the end cover 17 and the valve seat 16. The first cooling chamber 18 and the second cooling chamber 19 are respectively located on the left and right sides of the stator 21, and a third cooling chamber 110 is formed between the left end of the first magnet 211 and the left end connecting portion 222; an axially penetrating first flow channel 2111 is provided in the first magnet 211, and the left end of the first flow channel 2111 is connected to the third cooling chamber 110, and the right end is connected to the second cooling chamber 19; a plurality of radially penetrating and extending first through holes 2212 are provided on the outer peripheral body of one end of the cylinder portion 221 close to the left end connecting portion 222, and the first through holes 2212 connect the third cooling chamber 110 with the first cooling chamber 18; a first cooling inlet and outlet 171 communicating with the second cooling chamber 19 is provided on the end cover 17, and a second cooling inlet and outlet 161 communicating with the first cooling chamber 18 is provided on the valve seat 16. The second cooling cavity 19, the first flow channel 2111, the third cooling cavity 110, the first through hole 2212 and the first cooling cavity 18 together form a cooling pipeline system, which is connected to an external cooling device through the first cooling inlet and outlet 171 and the second cooling inlet and outlet 161, and comprehensively cools the internal and external structures of the motor assembly 2, greatly improving the cooling effect of the motor assembly 2. In addition to being able to connect the third cooling cavity 110 with the first cooling cavity 18, the first through hole 2212 can also prevent the cooling gas blown out of the first flow channel 2111 from entering the third cooling cavity 110 and causing a large axial impact on the left end connection part 222, thereby affecting the axial rightward pulling force of the mover 22 on the sealing rod 3, affecting the sealing performance.

[0033] The cooling gas output by the cooling device enters the second cooling chamber 19 from the first cooling inlet and outlet 171 to cool the right end connecting portion 213; then enters the third cooling chamber 110 through the first flow channel 2111, and can effectively cool the inside of the first magnet 211 when flowing through the first flow channel 2111. The cooling gas in the third cooling chamber 110 can effectively cool the left end surface and the left end connecting portion 222 of the first magnet 211; a part of the cooling gas in the third cooling chamber 110 enters the first cooling chamber 18 through the first through hole 2212, and the other part enters The cooling gas flows into the annular space between the barrel portion 221 and the first magnet 211, then enters the annular space between the barrel portion 221 and the second magnet 212 from the right end of the barrel portion 221, and finally returns to the first cooling chamber 18, so as to comprehensively cool down the stator 21 and the mover 22, and effectively prevent the stator 21 and the mover 22 from being overheated and unable to work normally; the cooling gas that converges into the first cooling chamber 18 returns to the cooling device from the second cooling inlet and outlet 161, so as to form a circulating cooling system; or flows in the opposite direction of the above-mentioned airflow direction for cooling.

[0034] A portion of the shaft connecting block 23 extends into the first cooling chamber 18 and can only be partially cooled. In order to reduce the influence of the heat on the shaft connecting block 23 on the left end connecting part 222, a plurality of axially penetrating second through holes 2221 are provided on the left end connecting part 222. One end of the second through hole 2221 is connected to the third cooling chamber 110, and the other end is aligned with the end face of the shaft connecting block 23. The second through hole 2221 is used to guide the cooling gas to the axial end face of the shaft connecting block 23, so as to cool the connection interface between the shaft connecting block 23 and the mover 22 and reduce heat transfer.

[0035] In order to ensure the sealing of the cooling pipeline system, a first mounting hole 162 is provided at one end of the valve seat 16 close to the end cover 17, and a second mounting hole 163 is provided at one end close to the insulation block 15. The first magnet 211 of the stator 21 is installed in the first mounting hole 162 by interference fit. A second sealing ring 111 for sealing the assembly gap between the valve seat 16 and the end cover 17 is provided on the interface where the valve seat 16 and the end cover 17 are assembled. The second cooling chamber 19 is sealed by the second sealing ring 111. The shaft connecting block 23 axially moves through the second mounting hole 163, and a first supporting sleeve 112 is provided in the second mounting hole 163 to support the shaft connecting block 23 to ensure its accurate axial movement position, a third sealing ring 113 is provided between the shaft connecting block 23 and the first supporting sleeve 112, and a fourth sealing ring 114 is provided between the first supporting sleeve 112 and the second mounting hole 163. The third sealing ring 113 and the fourth sealing ring 114 seal the assembly gap between the shaft connecting block 23 and the second mounting hole 163, thereby achieving the sealing of the first cooling chamber 18. A pressing cover 115 is also provided at the left end of the valve seat 16 to axially press the first supporting sleeve 112 in the second mounting hole 163, and the pressing cover 115 is fixedly connected to the valve seat 16 by a first screw 116.

[0036] The top of the valve seat 16 is also provided with a sealing threading assembly 4 for easy threading. The sealing threading assembly 4 includes a threading hole 41 that penetrates into the first cooling chamber 18 inside the valve seat 16 and a plurality of fifth sealing rings 42 that are colinearly arranged in the length section of the threading hole 41. The power cord is inserted from the threading hole 41 into the first cooling chamber 18 and connected to the two ends of the coil on the mover 22. The coil is energized, and the extension and retraction of the mover 22 can be achieved by changing the direction of the current in the coil. In order to facilitate the threading operation of the power cord and realize the installation design of the fifth sealing ring 42, in this embodiment, the sealing threading assembly 4 also includes a threading installation plate 43 and a threading sealing pressure plate 44. The threading installation plate 43 is fixedly installed on the top of the valve seat 16 by the sixth screw 48, and a sixth sealing ring 45 is provided on the interface assembled with the valve seat 16 to seal the assembly gap between the two, thereby ensuring the sealing of the first cooling chamber 18. The wire threading hole 41 is opened on the wire threading installation plate 43, and a sealing ring installation groove 46 is arranged on the wire threading installation plate 43 at the top of the wire threading hole 41. The fifth sealing ring 42 is installed in the sealing ring installation groove 46. The wire threading sealing pressure plate 44 is fixed to the top of the wire threading installation plate 43 by a second screw 47. The lower surface of the wire threading sealing pressure plate 44 is provided with a pressing ring part 441 to press the fifth sealing ring 42 downward to prevent the fifth sealing ring 42 from being pulled and displaced when the power cord passes through the wire threading hole 41 from top to bottom or from bottom to top.

[0037] Since one end of the sealing rod 3 is fixed to the driving end of the motor assembly 2, and the other end is cantilevered to the molding area 11, in order to ensure the accurate telescopic position of the sealing rod 3 and reliably and effectively block the exhaust port on the molding area 11 during the high-speed telescopic movement, a second guide sleeve 117 supporting the sealing rod 3 and a seventh sealing ring 118 sealing the gap between the mold block 14 and the sealing rod 3 are also provided in the mold core block 14. The seventh sealing ring 118 can seal the gap between the right end of the telescopic channel 12 and the sealing rod 3 to ensure that the air in the die-casting molding cavity can be quickly evacuated during vacuuming, and the space gas at the right end of the telescopic channel 12 will not affect the vacuuming, thereby ensuring the efficiency and effect of vacuuming.

[0038] In order to further improve the heat insulation effect of the heat insulation block 15, on the one hand, the heat insulation block 15 can be made of heat insulation materials, and on the other hand, a hollow structure 151 is provided inside the heat insulation block 15, and the air in the hollow structure 151 is used to form an air insulation layer to block heat transfer. The heat insulation block 15 is also provided with a pair of third cooling inlets and outlets 154 connected to the hollow structure 151, and the third cooling inlets and outlets 154 are connected to an external cooling device, so that a cooling air insulation layer is formed inside the heat insulation block 15.

[0039] The mold core block 14, the heat insulating block 15, the valve seat 16 and the end cover 17 are fixedly connected together by four third screws 5 of relatively long length. The third screws 5 are inserted from the end of the end cover 17, pass through the valve seat 16 and the heat insulating block 15 in sequence, and are screwed into the threaded holes in the mold core block 14. The heat insulating block 15 is provided with an avoidance through hole 152 for the third screw 5 to pass through and an avoidance slot 153 for avoiding the axial movement of the shaft end connecting block 23 and the sealing rod 3. The air heat insulating layer formed by the hollow structure 151 surrounds the avoidance through hole 152.

[0040] The entire valve body 1 is fixedly mounted on the die-casting mold by four fourth screws 6 pointing vertically downward. A pair of lifting rings 7 is also provided on the top of the valve body 1 for easy lifting.

[0041] Please refer to Fig.12, the shaft connecting block 23 is fixedly connected with the left end connecting part 222 by the fifth screw 24. The fifth screw 24 is inserted from the end of the shaft connecting block 23, passes through the shaft connecting block 23, and is screwed into the threaded hole on the left end connecting part 222. The gas in the third cooling chamber 110 may overflow to the outside of the valve seat 16 along the screw perforation inside the shaft connecting block 23. In order to avoid this problem, a receiving groove 231 is provided on the surface of the shaft connecting block 23 facing the shaft connecting block 23. A sealing sleeve 232 covering the outer periphery of the fifth screw 24 is provided in the receiving groove 231, which seals the assembly gap between the tail of the fifth screw 24 and the shaft connecting block 23 on the one hand, and seals the gap between the connection interface of the shaft connecting block 23 and the left end connecting part 222 on the other hand. An eighth sealing ring 233 is also sleeved on the rod body of the fifth screw 24 near the head to seal the assembly gap between the head of the fifth screw 24 and the shaft connecting block 23.

[0042] For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, all of which fall within the protection scope of the present invention.

Claims

1. A motor assembly, characterized in that: It includes: The stator comprises a first magnet and a second magnet, wherein the first magnet is cylindrical, the second magnet is tubular and surrounds the first magnet, and a magnetic field space is formed between the first magnet and the second magnet; The mover comprises a cylindrical portion extending from the left end into between the first magnet and the second magnet, a left end connecting portion arranged at the left end of the cylindrical portion, and a plurality of coils wound around the outer circumference of the cylindrical portion; A first flow channel is provided in the first magnet and axially passes through the left and right ends; a third cooling cavity is formed between the left end of the first magnet and the left end connecting portion, and a plurality of radially extending first through holes are provided on the cylindrical portion, and the first through holes connect the third cooling cavity with the space outside the cylindrical portion.

2. A vacuum solenoid valve for a die casting mold, characterized in that: The invention comprises a valve body, a motor assembly as claimed in claim 1 and arranged in the valve body, and a sealing rod driven by the motor assembly to telescopically move in the valve body.

3. The vacuum solenoid valve for die casting mold according to claim 2, characterized in that: A molding area constituting a part or all of the die-casting molding cavity is arranged on the left side surface of the valve body, and a telescopic channel connected to the surface of the molding area and a vacuum channel connected to the telescopic channel are arranged inside, and the vacuum channel is connected to a vacuum extraction device; an exhaust port is arranged in the molding area; an axial rod connecting block is fixedly arranged on the left end connecting part, one end of the sealing rod is fixed on the axial rod connecting block and the other end extends close to the molding area; the sealing rod is driven by the motor assembly to move in the telescopic channel to block or conduct the exhaust port, thereby blocking or conducting the vacuum channel and the die-casting molding cavity.

4. The vacuum solenoid valve for die casting mold according to claim 3, characterized in that: The valve body comprises a mold block, a heat insulation block, a valve seat and an end cover which are arranged in sequence from left to right; the telescopic channel and the vacuum channel are arranged in the mold block, and the motor assembly is arranged in the valve seat.

5. The vacuum solenoid valve for die casting mold according to claim 4, characterized in that: A first cooling cavity is arranged in the valve seat, a second cooling cavity is formed around the end cover and the valve seat, and the first cooling cavity and the second cooling cavity are respectively located on the left and right sides of the stator; the left end of the first flow channel is connected to the third cooling cavity, and the right end is connected to the second cooling cavity; the first through hole is connected to the third cooling cavity and the first cooling cavity; a first cooling inlet and outlet connected to the second cooling cavity is arranged on the end cover, and a second cooling inlet and outlet connected to the first cooling cavity is arranged on the valve seat; the first cooling inlet and outlet and the second cooling inlet and outlet are connected to a cooling device.

6. The vacuum solenoid valve for a die casting mold according to any one of claims 3 to 5, characterized in that: The left end connecting portion is provided with a plurality of axially penetrating second through holes, one end of the second through hole is connected to the third cooling cavity, and the other end is aligned with the end surface of the shaft connecting block.

7. The vacuum solenoid valve for die casting mold according to claim 4 or 5, characterized in that: A first mounting hole is provided in the valve seat at one end close to the end cover; the first magnet of the stator is installed in the first mounting hole by interference fit, and a second sealing ring is provided on the interface where the valve seat and the end cover are fitted to seal the assembly gap between the two.

8. The vacuum solenoid valve for die casting mold according to claim 4 or 5, characterized in that: A second mounting hole is provided in the valve seat at one end close to the insulation block; the shaft connecting block passes through the second mounting hole for axial movement, a first supporting sleeve for guiding the axial movement of the shaft connecting block is installed in the second mounting hole, a third sealing ring is provided between the shaft connecting block and the first supporting sleeve, and a fourth sealing ring is provided between the first supporting sleeve and the second mounting hole.

9. The vacuum solenoid valve for a die casting mold according to claim 8, characterized in that: A clamping cover for axially clamping the first supporting sleeve in the second mounting hole is arranged at the left end of the valve seat, and the clamping cover is fixedly connected to the valve seat by a first screw.

10. The vacuum solenoid valve for die casting mold according to claim 5, characterized in that: A sealing threading assembly is arranged on the top of the valve seat for facilitating threading; the sealing threading assembly comprises a threading hole penetrating into a first cooling cavity inside the valve seat and a plurality of fifth sealing rings arranged in a colinear manner within the length section of the threading hole.

11. The vacuum solenoid valve for die casting mold according to claim 10, characterized in that: The sealing threading assembly also includes a threading mounting plate and a threading sealing pressure plate, the threading mounting plate is mounted on the top of the valve seat, and a sixth sealing ring is provided on the interface with the valve seat to seal the assembly gap between the two; the threading hole is opened on the threading mounting plate, and a sealing ring mounting groove is provided on the threading mounting plate at the top of the threading hole, the fifth sealing ring is installed in the sealing ring mounting groove, the threading sealing pressure plate is fixed to the top of the threading mounting plate by a second screw, and a pressing ring is provided on the lower surface of the threading sealing pressure plate to press the fifth sealing ring downward.

12. The vacuum solenoid valve for die casting mold according to claim 4, characterized in that: The mold core block is provided with a second guide sleeve for guiding the axial movement of the sealing rod and a seventh sealing ring for sealing the gap between the right end of the telescopic channel and the sealing rod.

13. The vacuum solenoid valve for die casting mold according to claim 4, characterized in that: A hollow structure is arranged inside the heat insulation block, and the air in the hollow structure forms an air heat insulation layer.

14. The vacuum solenoid valve for die casting mold according to claim 4, characterized in that: The mold core block, the insulation block, the valve seat and the end cover are fixedly connected together by a plurality of third screws. The third screws are inserted from the end cover end, pass through the valve seat and the insulation block in sequence, and are screwed into the threaded hole in the mold core block; the valve body is fixedly mounted on the die-casting mold by a plurality of fourth screws pointing vertically downward.

15. The vacuum solenoid valve for die casting mold according to claim 3, characterized in that: The shaft rod connecting block and the left end connecting part are fixedly connected together by a fifth screw; the fifth screw is inserted from the end of the shaft rod connecting block, passes through the shaft rod connecting block and is screwed into the threaded hole on the left end connecting part; a receiving groove is provided on the surface of one side of the shaft rod connecting block facing the shaft rod connecting block, and a sealing sleeve covering the outer periphery of the fifth screw is provided in the receiving groove.

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