A motor component and a vacuum solenoid valve for a die-casting mold

Abstract

The present invention discloses an electric motor assembly and a vacuum solenoid valve for a die-casting mold, which comprises a valve body, an electric motor assembly arranged inside the valve body, and a sealing rod stator driven by the electric motor assembly. The electric motor assembly includes a first magnet and a second magnet. The first magnet is cylindrical in shape, and the second magnet is cylindrical and surrounds the outer periphery of the first magnet. A magnetic field space is formed between the first magnet and the second magnet. The rotor includes a cylindrical body portion located between the first magnet and the second magnet, a left-end connecting portion arranged at the left end of the cylindrical body portion, and a coil wound around the outer periphery of the cylindrical body portion. A first flow channel is arranged inside the first magnet. A third cooling cavity is formed between the left end of the first magnet and the left-end connecting portion. A plurality of first through holes extending radially are arranged on the cylindrical body portion, and the first through holes communicate the third cooling cavity with the space outside the cylindrical body portion. The present invention has high vacuum pumping efficiency, large exhaust volume, and fast response speed for opening and closing the valve body, and can meet the vacuum pumping requirements of die-casting processes with high-precision time control.

Description

Technical Field

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

[0002] A die-casting machine is a device that cooperates with a mold to complete the production of metal castings such as copper, magnesium, zinc, and aluminum. In order to achieve die-casting forming 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 smoothly discharged. Therefore, a vacuum valve must be provided on the die-casting machine mold and cooperate with a vacuum compressor to discharge the air in the mold. There are generally three forms of vacuum valves used in the die-casting industry: exhaust plates, mechanical valves, and hydraulic valves.

[0003] (1) Cooling exhaust plate: Its principle is to use metal cooling for solidifying casting alloys; the advantages are low cost and simple use; the 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 molten metal to close the valve core; the advantages are large exhaust volume and good vacuum effect; the disadvantages are complex processing, high manufacturing cost; there are vulnerable parts, high use cost, 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; the advantages are large exhaust volume, simple manufacturing, and reliable use; the disadvantage is that mechanical and electrical reactions require time, so it needs to be closed in advance, and the exhaust cannot reach the end of casting filling.

[0006] In the prior art, patent CN211667244U proposed a vacuum valve for a die-casting mold, which uses the rotation of the motor output shaft to drive the rotation of the push rod. The push rod pushes the spherical surface towards the direction of the mold exhaust hole interface, and the spherical surface makes the plug board advance through the connecting rod. At this time, the molten metal is blocked in the V-shaped groove by the plug board and the stop block. The structure of this vacuum valve does not show how the push rod is connected to the motor output shaft and how it pushes the spherical surface and the connecting rod. Therefore, the rapid and efficient horizontal movement of the plug board cannot be achieved.

[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 object of the present invention is to provide a motor assembly and a vacuum solenoid valve for a die-casting mold, which have high vacuum pumping efficiency, large exhaust volume, fast response speed for valve body opening and closing, and can meet the vacuum pumping requirements of die-casting processes with high-precision time control.

[0009] The present invention achieves the above object through the following technical solutions: A motor assembly, which includes:

[0010] The stator includes a first magnet and a second magnet. The first magnet is cylindrical in shape, and the second magnet is tubular and surrounds the periphery of the first magnet. A magnetic field space is formed between the first magnet and the second magnet.

[0011] The rotor includes a cylinder portion extending from the left end into the space between the first magnet and the second magnet, a left end connecting portion provided at the left end of the cylinder portion, and a plurality of coils wound around the outer periphery of the cylinder portion.

[0012] A first flow channel axially penetrating through the left and right ends is provided in the first magnet. A third cooling cavity is formed between the left end of the first magnet and the left end connecting portion. A plurality of first through holes extending radially are provided on the cylinder portion, and the first through holes communicate the third cooling cavity with the space outside the cylinder portion.

[0013] The present invention also provides a vacuum solenoid valve, which includes a valve body, a motor assembly as described above provided in the valve body, and a sealing rod driven by the motor assembly to perform telescopic movement in the valve body.

[0014] Further, a forming area that constitutes part or all of the die-casting cavity is provided on the left side surface of the valve body. An expansion channel communicating to the surface of the forming area and a vacuum channel communicating with the expansion channel are provided inside. The vacuum channel communicates with a vacuum pumping device. An exhaust port is provided in the forming area. A shaft rod connecting block is fixedly provided on the left end connecting portion. One end of the sealing rod is fixed on the shaft rod connecting block and the other end extends close to the forming area. The sealing rod is driven by the motor assembly to move in the expansion channel to block or conduct the exhaust port, thereby blocking or conducting the vacuum channel and the die-casting cavity.

[0015] Further, the valve body includes a mold core block, a heat insulation block, a valve seat, and an end cover sequentially arranged from left to right. The expansion channel and the vacuum channel are provided in the mold core block, and the motor assembly is provided in the valve seat.

[0016] Further, a first cooling cavity is provided in the valve seat, and a second cooling cavity is formed around between the end cover and the valve seat. 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 communicates with the third cooling cavity, and the right end communicates with the second cooling cavity. The first through holes communicate the third cooling cavity with the first cooling cavity. The end cover is provided with a first cooling inlet and outlet communicating with the second cooling cavity, and the valve seat is provided with a second cooling inlet and outlet communicating with the first cooling cavity. The first cooling inlet and outlet, the second cooling inlet and outlet are communicated with a cooling device.

[0017] Further, a number of axially penetrating second through holes are provided on the left end connecting portion, one end of the second through hole communicates with the third cooling cavity, and the other end is aligned with the end face of the shaft rod connecting block.

[0018] Further, a first mounting hole is provided at one end of the valve seat 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 for sealing the assembly gap between the valve seat and the end cover is provided on the interface where the valve seat and the end cover are fitted together.

[0019] Further, a second mounting hole is provided at one end of the valve seat close to the heat insulation block; the shaft rod connecting block axially moves through the second mounting hole, a first support shaft sleeve for guiding the axial movement of the shaft rod connecting block is installed in the second mounting hole, a third sealing ring is provided between the shaft rod connecting block and the first support shaft sleeve, and a fourth sealing ring is provided between the first support shaft sleeve and the second mounting hole.

[0020] Further, a pressing cover for axially pressing the first support shaft sleeve in the second mounting hole is provided at the left end of the valve seat, and the pressing cover is fixedly connected to the valve seat by a first screw.

[0021] Further, a sealed wire threading assembly for facilitating wire threading is provided at the top of the valve seat; the sealed wire threading assembly includes a wire threading hole penetrating into the first cooling cavity inside the valve seat and a number of fifth sealing rings arranged collinearly in the length section of the wire threading hole.

[0022] Further, the sealed wire threading assembly further includes a wire threading mounting plate and a wire threading sealing pressing plate. The wire threading mounting plate is installed at the top of the valve seat, and a sixth sealing ring for sealing the assembly gap between the two is provided on the interface where it is assembled with the valve seat; the wire threading hole is opened on the wire threading mounting plate, a sealing ring mounting groove is provided at the top of the wire threading hole on the wire threading mounting plate, the fifth sealing ring is installed in the sealing ring mounting groove, the wire threading sealing pressing plate is fixed to the top of the wire threading mounting plate by a second screw, and a pressing ring portion is provided on the lower surface of the wire threading sealing pressing plate to press the fifth sealing ring downward.

[0023] Further, a second guide shaft 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 provided inside the mold core block.

[0024] Further, a hollow structure is provided inside the heat insulation block, and the air inside the hollow structure forms an air heat insulation layer.

[0025] Further, the mold core block, the heat insulation block, the valve seat and the end cover are fixedly connected together by a number of third screws. The third screws are inserted from the end cover end, sequentially pass through the valve seat and the heat insulation block, and then are screwed into the threaded holes in the mold core block. The valve body is fixedly installed on the die-casting mold by a number of vertically downward fourth screws.

[0026] Further, the shaft rod connecting block and the left end connecting part are fixedly connected together with the left end connecting part by a fifth screw. The fifth screw is inserted from the shaft rod connecting block end, passes through the shaft rod connecting block, and then is screwed into the threaded hole on the left end connecting part. A receiving groove is provided on one side surface of the shaft rod connecting block facing the shaft rod connecting block, and a sealing sleeve covering the outer circumference of the fifth screw is provided in the receiving groove.

[0027] Compared with the prior art, the beneficial effects of a motor assembly and a vacuum solenoid valve for a die-casting mold of the present invention are as follows: high vacuum pumping efficiency, large exhaust volume, fast response speed for valve body opening and closing, and can meet the vacuum pumping requirements of die-casting processes with high-precision time control. Specifically:

[0028] (1) Adopting the same working principle as a hydraulic valve, using the time or stroke signal given by the equipment to close the valve body, giving priority to large exhaust volume, reliable use and high vacuum pumping efficiency. At the same time, the driving of 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, there is no need for a long mechanical and electrical reaction time, with fast response speed and high time control accuracy.

[0029] (2) By cleverly designing a motor assembly and directly embedding it inside the valve body, direct drive of the sealing rod is achieved. After the motor assembly is powered on, the valve body can be closed or opened quickly. The electronic assembly adopts a stator and rotor structure. An annular magnetic field space is formed in the stator. The rotor is designed as a cylindrical structure and extends into this magnetic field space. Coils are wound around the outer circumference of the cylindrical part. When the coils are powered on, the axial movement of the rotor can be realized. By fixing the sealing rod on the rotor, the telescopic drive of the sealing rod by the motor assembly can be realized, and the opening or closing of the valve body can be achieved. The entire motor structure is small and compact, occupies little space, and is convenient to install.

[0030] (3) The valve body is designed as a structure of a mold core block, a heat insulation block, a valve seat and an end cover. The motor assembly is installed in the valve seat. The heat insulation block is used to isolate the mold core block and the valve seat, reducing the heat transfer speed from the mold core block to the valve seat end and reducing the influence 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 heat insulation layer, further improving the heat insulation effect.

[0031] (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 left end of the stator and the inner wall of the left end of the rotor. At the same time, an axially penetrating cooling flow channel is designed at the center of the stator of the motor assembly, and a first through hole penetrating radially is designed on the rotor. The cooling flow channel is used to connect the second cooling cavity and the third cooling cavity, and the first through hole is used to connect the third cooling cavity and the first cooling cavity, so that a cooling pipeline system flowing through the inside of the motor assembly is formed inside the valve body. By connecting the external cooling device through this cooling pipeline system, the motor assembly can be effectively cooled, ensuring 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

[0032] Figure 1 It is a schematic three-dimensional assembled structure diagram of an embodiment of the present invention;

[0033] Figure 2 It is an exploded structure diagram of an embodiment of the present invention;

[0034] Figure 3 It is a schematic cross-sectional structure diagram when the vacuum solenoid valve of an embodiment of the present invention is opened;

[0035] Figure 4 It is a schematic cross-sectional structure diagram when the vacuum solenoid valve of an embodiment of the present invention is closed;

[0036] Figure 5 It is a schematic cross-sectional structure diagram at the first cooling inlet and outlet on the end cover of an embodiment of the present invention;

[0037] Figure 6 It is a schematic assembled structure diagram of the motor assembly and the sealing rod of an embodiment of the present invention;

[0038] Figure 7 It is an exploded structure diagram of the motor assembly and the sealing rod of an embodiment of the present invention;

[0039] Figure 8 It is a schematic cross-sectional assembled structure diagram of the motor assembly and the sealing rod of an embodiment of the present invention;

[0040] Figure 9 It is an exploded structure diagram of the sealing wire threading assembly of an embodiment of the present invention;

[0041] Figure 10 It is a schematic cross-sectional assembled structure diagram of the sealing wire threading assembly of an embodiment of the present invention;

[0042] Figure 11 It is a schematic cross-sectional structure diagram at the third cooling inlet and outlet on the heat insulation block of an embodiment of the present invention;

[0043] Figure 12Schematic cross-sectional structure diagram of the connection between the shaft rod connecting block and the motor assembly in the embodiment of the present invention;

[0044] The numbers in the figure represent:

[0045] 100 - Vacuum solenoid valve;

[0046] 1 - Valve body, 11 - Molding area, 12 - Telescopic channel, 13 - Vacuum channel, 14 - Mold core block, 15 - Heat 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 support bushing, 113 - Third sealing ring, 114 - Fourth sealing ring, 115 - Compression cover, 116 - First screw, 117 - Second guide bushing, 118 - Seventh sealing ring, 119 - Exhaust port;

[0047] 2 - Motor assembly, 21 - Stator, 211 - First magnet, 2111 - First flow channel, 212 - Second magnet, 213 - Right end connecting part, 214 - Magnetic field space, 22 - Rotor, 221 - Cylindrical part, 2211 - Annular groove, 2212 - First through hole, 222 - Left end connecting part, 2221 - Second through hole, 23 - Shaft rod connecting block, 231 - Receiving groove, 232 - Sealing sleeve, 233 - Eighth sealing ring, 24 - Fifth screw;

[0048] 3 - Sealing rod;

[0049] 4 - Sealing wire threading assembly, 41 - Wire threading hole, 42 - Fifth sealing ring, 43 - Wire threading mounting plate, 44 - Wire threading sealing pressing plate, 441 - Pressing ring part, 45 - Sixth sealing ring, 46 - Sealing ring mounting groove, 47 - Second screw, 48 - Sixth screw;

[0050] 5 - Third screw; 6 - Fourth screw; 7 - Lifting ring. Specific implementation manner

[0051] Embodiment 1:

[0052] Please refer to Figures 1-12 , this embodiment is a vacuum solenoid valve 100 for a die-casting mold, which includes a valve body 1, a motor assembly 2 arranged in the valve body 1, and a sealing rod 3 that is driven by the motor assembly 2 to perform telescopic movement in the valve body 1.

[0053] On the left side surface of the valve body 1, there is a forming area 11 that constitutes part or all of the die-casting forming cavity. Inside, there is a telescopic channel 12 connected to the surface of the forming area and a vacuum channel 13 connected to the telescopic channel 12. The vacuum channel 13 is connected to an external vacuum pumping device (not marked in the figure); the forming area 11 is provided with an exhaust port 119; the sealing rod 3 is driven by the motor assembly 2 to move in the telescopic channel 12 to block or conduct the exhaust port 119, thereby blocking or conducting the vacuum channel 13 and the die-casting forming cavity.

[0054] In this embodiment, when the sealing rod 3 moves to the right to the limit, the head of the sealing rod 3 seals the exhaust port from the inside of the die-casting forming cavity to ensure the sealing integrity of the die-casting forming cavity; when the sealing rod 3 moves to the left to the limit, the exhaust port opens, and the vacuum channel is connected to the die-casting forming cavity through the telescopic channel 12, and the die-casting forming cavity is evacuated through the vacuum pumping device. In other embodiments, the sealing rod 3 can also be designed to open the exhaust port when moving to the right to the limit and close the exhaust port when moving to the left to the limit.

[0055] In order to achieve the rapid response drive of the sealing rod 3, this embodiment uses the motor assembly 2 as the power source. Compared with a hydraulic cylinder, the driving speed is faster and the time control accuracy is higher. In order to achieve the telescopic drive of the motor assembly 2 for the sealing rod 3, this embodiment newly designs a structure of the motor assembly 2. Specifically, the motor assembly 2 includes a stator 21 fixed on the valve body 1, a rotor 22 that cooperates with the stator 21 and moves axially horizontally inside the valve body 1, and a shaft rod connecting block 23 fixed on the end face of the shaft of the rotor 22. One end of the sealing rod 3 is fixed on the shaft rod connecting block 23 and the other end extends close to the forming area 11. The stator 21 includes a first magnet 211, a second magnet 212, and a right-end connecting part 213 that connects the first magnet 211 and the second magnet 212 together at the right end. The first magnet 211 is cylindrical, the second magnet 212 is tubular and surrounds the first magnet 211. The first magnet 211 and the second magnet 212 have opposite magnetic polarities and a magnetic field space 214 is formed between them. The magnetic field space 214 forms the moving space of the rotor 22. The rotor 22 includes a cylindrical body part 221 located between the first magnet 211 and the second magnet 212, a left-end connecting part 222 provided at the left end of the cylindrical body part 221, and a plurality of coils (not marked in the figure) wound around the outer circumference of the cylindrical body part 221. An annular groove 2211 is provided on the outer circumference of the cylindrical body part 221 of the rotor 22, and the coils are wound in the annular groove 2211. The cylindrical body part 221 of the rotor 22 is located in the magnetic field space 214, and after the coils are energized, it undergoes axial telescopic movement under the action of the magnetic field in the magnetic field space 214. The shaft rod connecting block 23 is fixedly installed on the left-end connecting part 222.

[0056] The motor assembly 2 designed in this embodiment realizes miniaturization design, can be directly embedded in the valve body 1, and is installed on the die-casting mold.

[0057] Since the overall temperature of the die-casting mold is relatively high during die-casting molding, in order to avoid the high-temperature environment affecting the normal operation of the motor assembly 2 and the service life of the motor assembly 2, this embodiment optimizes the design of the valve body 1 and configures a cooling structure. Specifically, the valve body 1 includes a mold core block 14, a heat insulation block 15, a valve seat 16, and an end cover 17 arranged in sequence 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 heat insulation block 15 can effectively isolate the mold core block 14 from the valve seat 16, ensuring that the motor assembly 2 installed in the valve seat 16 is not affected by the high temperature of the mold core block 14.

[0058] Since one 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 during operation is not too high and to ensure its long service life, this embodiment is provided with a cooling structure in the valve seat 16, and a cooling flow channel is also designed inside the motor assembly 2. Specifically:

[0059] A first cooling cavity 18 is provided inside the valve seat 16, and a second cooling cavity 19 is formed around between the end cover 17 and the valve seat 16. The first cooling cavity 18 and the second cooling cavity 19 are respectively located on the left and right sides of the stator 21. A third cooling cavity 110 is formed between the left end of the first magnet 211 and the left end connection part 222; an axially penetrating first flow channel 2111 is provided inside the first magnet 211. The left end of the first flow channel 2111 communicates with the third cooling cavity 110, and the right end communicates with the second cooling cavity 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 part 221 close to the left end connection part 222. The first through holes 2212 communicate the third cooling cavity 110 with the first cooling cavity 18; a first cooling inlet / outlet 171 communicating with the second cooling cavity 19 is provided on the end cover 17, and a second cooling inlet / outlet 161 communicating with the first cooling cavity 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 holes 2212 and the first cooling cavity 18 together form a cooling pipeline system. The cooling pipeline system is communicated with an external cooling device through the first cooling inlet / outlet 171 and the second cooling inlet / outlet 161 to comprehensively cool the internal and external structures of the motor assembly 2, greatly improving the cooling effect of the motor assembly 2. The setting of the first through holes 2212 can not only communicate the third cooling cavity 110 with the first cooling cavity 18, but also prevent the cooling gas blown out from the first flow channel 2111 from causing a large axial impact on the left end connection part 222 after entering the third cooling cavity 110, thereby affecting the axial rightward pulling force of the mover 22 on the sealing rod 3 and affecting the sealing performance.

[0060] The cooling gas output by the cooling device enters the second cooling cavity 19 from the first cooling inlet / outlet 171 to cool the right end connection part 213; then it enters the third cooling cavity 110 through the first flow channel 2111. When flowing through the first flow channel 2111, it can effectively cool the inside of the first magnet 211. The cooling gas in the third cooling cavity 110 can effectively cool the left end face of the first magnet 211 and the left end connection part 222; a part of the cooling gas in the third cooling cavity 110 enters the first cooling cavity 18 through the first through holes 2212, and the other part enters the annular space between the cylinder part 221 and the first magnet 211, then enters the annular space between the cylinder part 221 and the second magnet 212 from the right end of the cylinder part 221, and finally returns to the first cooling cavity 18 to comprehensively cool and lower the temperature of the stator 21 and the mover 22, effectively preventing the situation that the stator 21 and the mover 22 cannot work properly due to excessive temperature; the cooling gas converging in the first cooling cavity 18 returns to the cooling device from the second cooling inlet / outlet 161 to form a circulating cooling system; or it cools in the reverse direction of the above gas flow direction.

[0061] A part of the shaft connecting block 23 extends into the first cooling cavity 18 and can only be partially cooled. To reduce the influence of the heat on the left end connecting portion 222 of the shaft connecting block 23, a number of axially penetrating second through holes 2221 are provided on the left end connecting portion 222. One end of the second through hole 2221 communicates with the third cooling cavity 110, and the other end is aligned with the end face of the shaft connecting block 23. The cooling gas is guided to the shaft end face of the shaft connecting block 23 through the second through hole 2221 to cool the connection interface between the shaft connecting block 23 and the mover 22 and reduce heat transfer.

[0062] To ensure the sealing performance 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 heat insulation block 15. The first magnet 211 of the stator 21 is press-fitted into the first mounting hole 162. A second sealing ring 111 for sealing the assembly gap between the two is provided on the interface where the valve seat 16 and the end cover 17 are fitted together, and the second cooling cavity 19 is sealed through the second sealing ring 111. The shaft connecting block 23 axially moves through the second mounting hole 163. A first support shaft sleeve 112 for supporting the shaft connecting block 23 to ensure the accuracy of its axial movement position is provided in the second mounting hole 163. A third sealing ring 113 is provided between the shaft connecting block 23 and the first support shaft sleeve 112, and a fourth sealing ring 114 is provided between the first support shaft sleeve 112 and the second mounting hole 163. The assembly gap between the shaft connecting block 23 and the second mounting hole 163 is sealed through the third sealing ring 113 and the fourth sealing ring 114, thereby realizing the sealing of the first cooling cavity 18. A pressing cover 115 for axially pressing the first support shaft sleeve 112 in the second mounting hole 163 is further provided at the left end of the valve seat 16, and the pressing cover 115 is fixedly connected to the valve seat 16 through a first screw 116.

[0063] A sealing wire threading assembly 4 facilitating wire threading is further provided at the top of the valve seat 16. The sealing wire threading assembly 4 includes a wire threading hole 41 penetrating into the first cooling cavity 18 inside the valve seat 16 and a plurality of fifth sealing rings 42 arranged collinearly within the length section of the wire threading hole 41. The power cord passes through the wire threading hole 41 into the first cooling cavity 18 and is connected to both ends of the coil on the mover 22 to energize the coil. By changing the direction of the current in the coil, the extending and retracting actions of the mover 22 can be achieved. For the convenience of wire threading operation of the power cord and the installation design of the fifth sealing ring 42, in this embodiment, the sealing wire threading assembly 4 further includes a wire threading mounting plate 43 and a wire threading sealing pressing plate 44. The wire threading mounting plate 43 is fixedly installed on the top of the valve seat 16 by a sixth screw 48, and a sixth sealing ring 45 for sealing the assembly gap between the two is provided at the interface assembled with the valve seat 16 to ensure the sealing performance of the first cooling cavity 18. The wire threading hole 41 is opened on the wire threading mounting plate 43. A sealing ring mounting groove 46 is provided at the top of the wire threading mounting plate 43 where the wire threading hole 41 is located. The fifth sealing ring 42 is installed in the sealing ring mounting groove 46. The wire threading sealing pressing plate 44 is fixed on the top of the wire threading mounting plate 43 by a second screw 47. A pressing ring portion 441 is provided on the lower surface of the wire threading sealing pressing plate 44 to press the fifth sealing ring 42 downward, preventing 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.

[0064] Since one end of the sealing rod 3 is fixed to the driving end of the motor assembly 2 and the other end extends to the molding area 11 in a cantilever structure, during the high-speed telescopic movement, in order to ensure the accurate position of the telescopic movement of the sealing rod 3 and reliably and effectively block the exhaust port on the molding area 11, a second guide bushing 117 for supporting the sealing rod 3 and a seventh sealing ring 118 for sealing the gap between the mold insert block 14 and the sealing rod 3 are further provided in the mold insert block 14. The setting of the seventh sealing ring 118 can seal the gap between the right end of the telescopic channel 12 and the sealing rod 3, so as to ensure that when evacuating, the air in the die casting cavity can be quickly evacuated, and the gas in the space at the right end of the telescopic channel 12 will not affect the evacuation, ensuring the efficiency and effect of evacuation.

[0065] To further improve the heat insulation effect of the heat insulation block 15, on the one hand, the heat insulation block 15 can adopt heat insulation materials. On the other hand, a hollow structure 151 is provided inside the heat insulation block 15 to form an air heat insulation layer with the air inside the hollow structure 151 to block heat transfer. A pair of third cooling inlets and outlets 154 communicating with the hollow structure 151 are further provided on the heat insulation block 15. By connecting to an external cooling device through the third cooling inlets and outlets 154, a cooling air heat insulation layer is formed inside the heat insulation block 15.

[0066] The mold core block 14, heat insulation block 15, valve seat 16 and end cover 17 are fixedly connected together by four third screws 5 with longer lengths. The third screws 5 are inserted from the end cover 17 end, sequentially pass through the valve seat 16 and heat insulation block 15, and then are screwed into the threaded holes in the mold core block 14. An avoidance perforation 152 for the third screw 5 to pass through, an avoidance slot 153 for the axial movement of the avoidance shaft end connection block 23 and the sealing rod 3 are provided in the heat insulation block 15. The air heat insulation layer formed by the hollow structure 151 surrounds the avoidance perforation 152 inside.

[0067] The entire valve body 1 is fixedly installed on the die-casting mold by four vertically downward fourth screws 6. A pair of lifting rings 7 are also provided at the top of the valve body 1 for convenient lifting.

[0068] Please refer to Figure 12 , the shaft rod connection block 23 is fixedly connected to the left end connection part 222 by a fifth screw 24. The fifth screw 24 is inserted from the shaft rod connection block 23 end, passes through the shaft rod connection block 23, and then is screwed into the threaded hole on the left end connection part 222. The gas in the third cooling cavity 110 may overflow outside the valve seat 16 along the screw perforation inside the shaft rod connection block 23. To avoid this problem, a receiving groove 231 is provided on the surface of the shaft rod connection block 23 facing the shaft rod connection block 23. A sealing sleeve 232 covering the outer circumference of the fifth screw 24 is provided in the receiving groove 231. On the one hand, it seals the assembly gap between the tail of the fifth screw 24 and the shaft rod connection block 23, and on the other hand, it seals the gap between the connection interface of the shaft rod connection block 23 and the left end connection part 222. 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 rod connection block 23.

[0069] For those of ordinary skill in the art, without departing from the inventive concept of the present invention, several deformations and improvements can still be made, and these all belong to 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 a 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 pressing cover for axially pressing the first supporting sleeve in the second mounting hole is arranged at the left end of the valve seat, and the pressing 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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