An automatic centrifugal casting device for ball valve sphere

Abstract

The invention relates to an automatic centrifugal casting device for a ball valve, which belongs to the field of centrifugal casting equipment. The device comprises a mold, a mold locking device, and a mold loading and unloading device. The mold locking device adopts a hydraulic locking device, and the mold loading and unloading device adopts a six-claw hydraulic device. The mold consists of an outer mold and an inner mold, and the inner mold and the outer mold are made of metal materials and are locked and connected by a hydraulic locking device. The hydraulic locking device and the six-claw hydraulic device are automatically controlled and operated by a hydraulic system of a centrifuge. The inner mold and the ball blank are automatically demoulded by the six-claw hydraulic device, thereby realizing automatic mold loading and automatic demoulding. The device has the advantages of high casting density, low molten steel loss, low casting cost, environmentally friendly casting process, low casting cost, high production efficiency, and the like.

Description

Technical Field

[0001] The invention relates to centrifugal casting equipment, in particular to an automatic centrifugal casting device for a ball valve sphere. Background Art

[0002] This invention is a priority application to the prior application date of July 19, 2024, with prior application number CN202410972870.9 and the prior application date of November 6, 2024, with prior application number CN202411570087.6.

[0003] Currently, the spheres used in ball valves for low-pressure applications are generally manufactured using a casting process, while those for high-pressure applications are generally manufactured using a forging process. Common casting processes include sand casting and lost-wax casting. The spheres produced by these processes have defects such as sand holes and pores, resulting in low density and low pressure resistance, making them suitable only for low-pressure applications. Furthermore, the consumption of sand and wax materials is high, with molten iron losses reaching 35-40%. This leads to significant material loss and environmental pollution during the production process. The forging process utilizes steel sections through multiple forging passes to form a solid sphere blank, which is then formed through turning and grinding. The spheres have high density and good pressure resistance, making them suitable for high-pressure valve products. However, the manufacturing process is complex, with low production efficiency, significant material waste, and high manufacturing costs. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the present invention provides an automatic centrifugal casting device for ball valves, which uses a hydraulic control device to realize automatic mold installation and automatic demoulding, has high casting density, low cost, environmentally friendly casting process and high production efficiency.

[0005] The technical solution for implementing the present invention is:

[0006] An automatic centrifugal casting device for a ball valve comprises a mold, a mold locking device, and a mold loading and unloading device. The mold consists of an outer mold and an inner mold, the outer mold being made of ordinary steel and the inner mold being made of high-temperature resistant steel. The outer mold consists of a mounting plate fixedly connected to a centrifuge main shaft and an inner mold mounting cavity, and the inner mold is locked and mounted in the inner mold mounting cavity of the outer mold by the mold locking device. The device is characterized in that the inner mold consists of a left half mold, a right half mold, and an axial hole casting rod, and is integrally embedded in the inner mold mounting cavity; a hemispherical inner cavity is symmetrically arranged on one side of the contact surface between the left half mold and the right half mold, and the two are spliced ​​to form a spherical casting cavity; the axial hole casting rod is mounted between the left half mold and the right half mold, and a casting hole communicating with the hemispherical inner cavity is provided in the center of the right half mold.

[0007] The preferred embodiment is that a spherical inner core is provided in the spherical casting cavity, and at least two radial positioning rods are provided on the outer spherical surface of the spherical inner core, and the radial positioning rods are fixedly installed in the radial positioning holes of the inner wall of the spherical casting cavity formed between the left half mold and the right half mold; the spherical inner core has a central through hole, the diameter of the central through hole is larger than the diameter of the channel hole of the spherical blank, and an annular casting cavity is formed between the outer spherical surface of the spherical inner core and the inner cavity wall of the spherical casting cavity, and the annular casting cavity is connected with the casting hole; the spherical inner core has a hollow inner cavity, and the radial positioning rods are fixedly welded on the radial outer spherical surface of the spherical inner core perpendicular to the central through hole, and a radial exhaust pipe is provided on the inner hole wall of the central through hole, one end of the radial exhaust pipe is connected to the hollow inner cavity of the spherical inner core, and the other end extends radially to the center line of the central through hole; an axial hole casting cavity adapted to the axial hole casting rod is provided on the outer spherical surface of the spherical inner core, and there is a gap between the outer peripheral surface of the axial hole casting rod and the inner cavity wall of the axial hole casting cavity.

[0008] The preferred solution is that the mold locking device adopts a hydraulic locking device, including a cylinder, a cylinder push rod, a locking hook and a thrust transmission mechanism connecting the cylinder push rod and the locking hook. One end of the cylinder push rod is located in the inner cavity of the cylinder and is driven by hydraulic oil to move axially. The outer cylindrical surface of the other end is clearance-matched with the inner wall of the center hole of the centrifuge main shaft. The cylinder push rod and the cylinder rotate synchronously with the centrifuge main shaft. The cylinder is controlled by the hydraulic system of the centrifuge. There are at least two locking hooks, which are evenly arranged in the circumferential direction on the mounting lugs on the outer side of the right end face of the outer mold.

[0009] The preferred solution is that the thrust transmission mechanism consists of a connecting square plate, a locking disk, and a locking rod. One end of the connecting square plate passes through the radial square hole on the centrifuge main shaft and is fixedly connected to the outer cylindrical surface of the cylinder push rod. One end of the locking rod is hingedly installed in the right plane of the locking disk, and the other end is hinged to the tail of the locking hook. The middle of the locking hook is rotatably installed on the mounting lug, and the head of the locking hook has a hook head that is tightly locked with the right half mold. The number of connecting square plates, locking rods and locking hooks is equal.

[0010] The preferred solution is that the mold loading and unloading device adopts a six-claw hydraulic device, including a base, a column, a clamping claw, a clamping claw mounting mechanism and a clamping claw control mechanism. The column is mounted on the base through a movable plate, and the lower plane of the movable plate and the upper plane of the base are connected to each other by slide rails and slide grooves. A movable plate control device is provided between the movable plate and the base; the clamping claw mounting mechanism includes a clamping claw mounting plate and a clamping claw mounting body. The right plane of the clamping claw mounting plate is fixedly mounted on the left end of the clamping claw mounting body, and six radial sliding grooves are evenly arranged in the circumferential direction of the left plane of the clamping claw mounting plate. Grooves, clamping jaws are respectively installed in each radial slide groove, and the clamping jaw mounting body is installed on the column through a lifting mechanism; the clamping jaw control mechanism includes a hydraulic cylinder and a connecting rod control mechanism, the hydraulic cylinder is fixedly mounted on the right end of the clamping jaw mounting body, and the hydraulic cylinder has six, three of which are evenly distributed in the circumferential direction of the clamping jaw mounting body as a group for synchronous control, the piston rods of the six hydraulic cylinders are respectively connected to the six clamping jaws through the connecting rod control mechanism, and the six clamping jaws are grouped with three of the clamping jaws that are synchronously controlled to form a mold clamping jaw group and a spherical blank clamping jaw group.

[0011] The preferred solution is that the connecting rod control mechanism includes an adjusting rod, a rotating angle plate, and a chain plate. The adjusting rod, the rotating angle plate, and the chain plate have the same number as the clamping jaws. The corners of the six rotating angle plates are evenly rotatably mounted on the outer circumference of the clamping jaw mounting plate. The two ends of the adjusting rod are respectively hinged to the piston rod of the hydraulic cylinder and one end of the rotating angle plate, and the two ends of the chain plate are respectively hinged to the other end of the rotating angle plate and the clamping jaw.

[0012] The preferred solution is that the movable plate control device is composed of a servo motor, a sprocket, and a chain. The sprocket is composed of a driving sprocket and a driven sprocket, which are installed on the base through a rotating shaft. The driving sprocket is connected to the servo motor, and both ends of the chain can be installed on the driving sprocket and the driven sprocket, and the upper side of the chain is connected to the movable plate; the lifting mechanism is composed of a lifting servo motor, a lifting sprocket, and a lifting chain. The lifting sprocket is composed of a driving wheel and a driven wheel, which are installed at the upper and lower ends of the column through a rotating shaft. The driving wheel is connected to the lifting servo motor, and both ends of the lifting chain can be installed on the driving wheel and the driven wheel. One side of the lifting chain is connected to the clamp mounting body, and the clamp mounting body and the column are connected to each other by lifting guide rails and lifting guide grooves.

[0013] The preferred solution is to set a rotating device between the column and the movable plate, and the rotating device consists of a rotating servo motor and a transmission mechanism between the rotating servo motor shaft and the column. The rotating servo motor housing is fixedly installed in the movable plate, and its rotating shaft is connected to the lower end of the column through a transmission mechanism.

[0014] The preferred solution is that radial top blocks are provided at the ends of the three jaws of the spherical blank clamping group, and the ends of the three radial top blocks are located on the same circumferential surface. When the three jaws radially shrink, the diameter of the outer circumferential surface of the three radial top blocks is smaller than the diameter of the casting hole. When the three jaws are radially expanded in the casting cavity of the valve body, the diameter of the outer circumferential surface of the three radial top blocks is larger than the diameter of the inner hole of the spherical blank; a clamping hole concentric with the casting hole is provided at the right end of the right half mold, and the diameter of the clamping hole is larger than the diameter of the casting hole, forming an annular step between the clamping hole and the casting hole; the length of the three jaws of the mold clamping group is smaller than the length of the three jaws of the spherical blank clamping group, and when the ends of the three jaws of the mold clamping group touch the annular step, the radial top blocks of the three jaws of the spherical blank clamping group extend into the inner cavity of the spherical casting cavity.

[0015] The beneficial effects of the present invention compared with the prior art are:

[0016] 1. The centrifugal casting process achieves high casting density, reduces molten iron loss at the pouring gate to less than 10%, and reduces casting costs. The mold is composed of a metal outer mold and a metal inner mold. The process is environmentally friendly, avoids material loss in sand molds and wax molds, and reduces casting costs. When casting spheres of different sizes, only the inner mold with the corresponding inner cavity diameter needs to be replaced, and the outer mold can be used universally without disassembly and assembly, saving mold manufacturing materials, installation, and replacement time, and improving production efficiency.

[0017] 2. The inner mold and the outer mold are locked and connected by a hydraulic locking device, which is automatically controlled and operated by the centrifuge hydraulic system. The right half mold and the spherical blank are automatically demoulded by a six-claw hydraulic device, realizing automatic loading and unloading of the inner mold and automatic demoulding of the spherical blank, which has the advantages of high degree of automation of the casting process and high production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The invention is a schematic diagram of the installation structure between the mold, the mold locking device, and the centrifuge main shaft.

[0019] Figure 2 It is a structural schematic diagram of the mold loading and unloading device of the present invention.

[0020] Figure 3 This invention Figure 2 Left view of .

[0021] Figure 4 It is a structural schematic diagram of the mold with a spherical inner core of the present invention.

[0022] Figure 5 This invention Figure 4 Schematic diagram of the integrated structure of the middle and outer molds and the left half mold.

[0023] In the figure: 1 outer mold, 2 left half mold, 3 right half mold, 4 centrifuge main shaft, 5 axis hole casting rod, 6 inner mold mounting cavity, 7 sphere casting cavity, 8 casting hole, 9 cylinder, 10 cylinder push rod, 11 lock hook, 12 mounting lug, 13 connecting square plate, 14 lock plate, 15 lock rod, 16 radial square hole, 17 base, 18 column, 19 clamping jaw, 20 moving plate, 21 slide rail, 22 clamping jaw mounting plate, 23 clamping jaw mounting body, 24 radial slide groove, 25 hydraulic cylinder, 26 adjustment rod, 27 rotating angle plate, 28 chain plate, 29 servo motor, 30 chain, 31 driving sprocket, 32 driven sprocket, 33 rotating shaft, 34 lifting servo motor, 35 lifting chain, 36 driving wheel, 37 driven wheel, 38 lifting guide rail, 39 rotating servo motor, 40 spherical blank, 41 clamping hole, 42 annular step, 43 spherical inner core, 44 center through hole, 45 annular casting cavity, 46 hollow inner cavity, 47 radial exhaust pipe, 48 shaft hole casting cavity, 49 radial adjustment plate, 50 adjusting screw, 51 adjusting nut. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below with reference to the accompanying drawings:

[0025] Example 1:

[0026] This embodiment is based on a priority application with a prior application date of July 19, 2024 and a prior application number of CN202410972870.9.

[0027] like Figure 1 、 Figure 2 、 Figure 3The automatic centrifugal casting device for the ball valve shown includes a mold, a mold locking device, and a mold loading and unloading device. The mold consists of an outer mold 1 and an inner mold. The outer mold 1 is made of ordinary steel. During the centrifugal casting process, the high temperature of the molten steel has little effect on the strength of the outer mold 1. Therefore, the outer mold 1 can be made of ordinary materials to reduce the manufacturing cost of the mold. The inner mold is made of high-temperature resistant steel. The outer mold 1 consists of a mounting plate fixedly connected to the centrifuge main shaft 4 and an inner mold mounting cavity 6. The centrifuge adopts a horizontal centrifuge. The outer mold 1 can be manufactured in one piece or manufactured and installed separately by the mounting plate and the inner mold mounting cavity 6. When casting spherical blanks 40 of different diameters, only the corresponding inner mold needs to be replaced within a certain range, and the outer mold 1 does not need to be replaced, thereby improving the universal range of the outer mold 1. The inner mold is locked and installed in the inner mold mounting cavity 6 of the outer mold 1 by the mold locking device; its characteristic is that: the inner mold consists of a left half mold 2, a right half mold 3 and an axial hole casting rod 5, and the whole is locked and installed in the inner mold mounting by the mold locking device The purpose of setting the axial hole casting rod 5 in the cavity 6 is to provide the valve stem mounting hole in the cast spherical blank 40, thereby avoiding the process of machining the valve stem mounting hole on the spherical blank 40 and the material loss caused by machining the valve stem mounting hole; a hemispherical inner cavity is symmetrically set on one side of the contact surface of the left half mold 2 and the right half mold 3, and the two are spliced ​​to form the spherical casting cavity 7, and the axial hole casting rod 5 is installed between the left half mold 2 and the right half mold 3, and is located in the diameter direction of the spherical casting cavity 7 perpendicular to the center line of the centrifuge main shaft 4, and in the right half mold 3. A casting hole 8 is provided in the center of the centrifugal casting die to connect to the inner cavity of the hemispherical surface. The diameter of the casting hole 8 is smaller than the inner diameter of the channel of the spherical blank 40 to be cast, so as to prevent the molten steel from overflowing during the centrifugal casting process. The diameter of the casting hole 8 satisfies the conditions for molten steel casting. The smaller the diameter, the less the loss of molten steel splashing. The molten steel is continuously injected while the centrifugal casting mold rotates at high speed, so that the molten steel forms a spherical blank 40 without pores and bubbles in the spherical casting cavity 7 under the action of centrifugal force, and the loss of molten steel at the pouring head can be reduced to less than 10%.

[0028] Example 2:

[0029] This embodiment is a priority application with a prior application date of November 6, 2024 and a prior application number of CN202411570087.6.

[0030] On the basis of the technical solution of Example 1, this embodiment adopts a spherical inner core 43 provided in the spherical casting cavity 7, and at least two radial positioning rods are provided on the outer spherical surface of the spherical inner core 43, and the radial positioning rods are fixedly installed in the radial positioning holes between the left half mold 2 and the right half mold 3, and the spherical inner core 43 is fixedly installed in the spherical casting cavity 7 to prevent the spherical inner core 43 from swinging under the action of centrifugal force during the casting process; the spherical inner core 43 has a central through hole 44, and the diameter of the central through hole 44 is larger than the diameter of the channel hole of the spherical blank 40. An annular casting cavity 45 is formed between the outer spherical surface of the spherical inner core 43 and the inner cavity wall of the spherical casting cavity 7, and the annular casting cavity 45 is connected to the casting hole 8, and the molten steel is injected through the casting hole 8. The spherical body is poured into the spherical casting cavity 7, and the molten steel is wrapped around the surface of the spherical inner core 43 under the action of centrifugal force to form a spherical blank 40. The radial thickness of the annular casting cavity 45 is designed according to the working pressure of the sphere. Under the condition of reliably bearing the working pressure, the smaller the radial thickness of the annular casting cavity 45, the greater the cost saving effect. The lower limit of the radial thickness of the annular casting cavity 45 shall not be less than the wall thickness of the valve body; the spherical inner core 43 has a hollow inner cavity 46, and the radial positioning rod is fixedly welded on the radial outer spherical surface of the spherical inner core 43 perpendicular to the central through hole 44. A radial exhaust pipe 47 is provided on the inner hole wall of the central through hole 44. One end of the radial exhaust pipe 47 is connected to the hollow inner cavity 46 of the spherical inner core 43, and the other end extends radially to the center line of the central through hole 44. Figure 4 As shown, during the casting process, the molten steel is radially thrown out along the central through hole 44 under the action of centrifugal force, so that a cavity is formed in the center of the central through hole 44, and the gas in the hollow inner cavity 46 is discharged to the central through hole 44 through the radial exhaust pipe 47, so as to prevent the gas in the hollow inner cavity 46 from expanding at high temperature to produce ultra-high pressure, which may cause the spherical inner core 43 to burst and cause a safety accident; an axial hole casting cavity 48 adapted to the axial hole casting rod 5 is provided on the outer spherical surface of the spherical inner core 43, and there is a gap between the outer peripheral surface of the axial hole casting rod 5 and the inner cavity wall of the axial hole casting cavity 48. Under the action of centrifugal force, the molten steel enters the gap between the axial hole casting rod 5 and the axial hole casting cavity 48 to form a valve stem shaft hole, thereby avoiding the process of machining the valve stem shaft hole of the spherical blank 40.

[0031] The technical effect of this technical solution is that a hollow spherical inner core 43 is provided in the sphere casting cavity 7, so that a hollow structure is formed between the channel hole of the sphere blank 40 and the spherical surface. While ensuring the pressure resistance of the sphere, the weight can be greatly reduced, the material consumption can be reduced, the manufacturing cost of the sphere and the rotational torque in the ball valve and the actuator configuration cost can be reduced, the load of the ball valve on the pipeline system is reduced, and the installation and use performance of the sphere are greatly improved.

[0032] In the above embodiment, the mold locking device adopts a hydraulic locking device, including a cylinder 9, a cylinder push rod 10, a lock hook 11, and a thrust transmission mechanism connecting the cylinder push rod 10 and the lock hook 11. One end of the cylinder push rod 10 is located in the inner cavity of the cylinder 9, and the two form a piston structure. The hydraulic oil pushes the cylinder push rod 10 to move axially, and the outer cylindrical surface of the other end is clearance-matched with the inner hole wall of the center hole of the centrifuge main shaft 4. The cylinder push rod 10 and the cylinder 9 rotate synchronously with the centrifuge main shaft 4, that is, the cylinder push rod 10 can move axially in the centrifuge main shaft 4, and the circumferential direction is limited by the axial key and the axial groove to limit relative rotation. The cylinder 9 is provided with working hydraulic pressure by the centrifuge hydraulic system. There are at least two lock hooks 11, which are evenly arranged on the mounting lugs 12 on the outer side of the right end face of the outer mold 1 in the circumferential direction. Figure 1 As shown, a dynamic seal can be used between the outer cylindrical surface of the cylinder push rod 10 and the inner wall of the cylinder 9 to form a piston structure, or a piston structure can be formed by fixedly connecting the piston in the inner cavity of the cylinder 9. The hydraulic pressure of the centrifuge hydraulic system pushes the piston, and the cylinder push rod 10 moves axially. The locking hook 11 is pushed by the thrust transmission mechanism to lock or unlock the inner mold and the outer mold 1, thereby realizing automatic locking and automatic unlocking of the inner mold. Compared with the prior art that uses manual wedging blocks to wed, the production efficiency is greatly improved.

[0033] The technical effect produced by this technical feature is that the mold locking device adopts a hydraulic locking device that rotates synchronously with the centrifuge main shaft 4, and the locking or unlocking between the inner mold and the outer mold 1 is controlled by the centrifuge hydraulic system, thereby realizing automatic operation of inner mold installation and demolding, thereby improving production efficiency.

[0034] The thrust transmission mechanism is composed of a connecting square plate 13, a locking disk 14, and a locking rod 15. One end of the connecting square plate 13 passes through a radial square hole 16 on the centrifuge main shaft 4 and is fixedly connected to the outer cylindrical surface of the cylinder push rod 10. The right plane of the connecting square plate 13 is fixedly connected to the left plane of the locking disk 14. One end of the locking rod 15 is hingedly installed in the right plane of the locking disk 14, and the other end is hinged to the tail of the locking hook 11. The middle of the locking hook 11 is rotatably installed on the mounting lug 12. The head of the locking hook 11 has a hook head that is locked with the right half mold 3. The number of connecting square plates 13 and locking rods 15 is equal to that of the locking hooks 11. Figure 1As shown, the connecting square plate 13 and the cylinder push rod 10 are fixedly connected to each other by a keyway connection, that is, the rectangular end of the connecting square plate 13 is fixedly inserted into the rectangular groove of the outer cylindrical surface of the cylinder push rod 10, and the connecting square plate 13 and the cylinder push rod 10 are fixedly connected, so that the cylinder push rod 10 drives the connecting square plate 13 to move axially in the radial square hole 16; the right plane of the connecting square plate 13 is fixedly installed in the left plane of the lock plate 14 by screws. The lock plate 14 adopts a disc structure and rotates synchronously with the centrifuge main shaft 4. Rod 15 is connected to locking disk 14 via radial adjustment plate 49, which is mounted within the right plane of locking disk 14. The end of locking rod 15 is hingedly connected to the adjustment hole in radial adjustment plate 49. Adjusting the hinged connection between locking rod 15 and radial adjustment plate 49 allows the axial distance between locking rod 15 and locking hook 11 to be adjusted. Mounting lug 12 is fixed to the right side of outer mold 1 with screws. Three locking hooks 11 and mounting lugs 12 are evenly spaced circumferentially around the right side of outer mold 1. Cylinder 9, through cylinder push rod 10, connecting square plate 13, locking disk 14, radial adjustment plate 49, and locking rod 15, pushes or pulls locking hook 11 to rotate clockwise or counterclockwise about the hinge point on mounting lug 12, thereby locking or unlocking the inner mold.

[0035] The technical effect produced by this technical feature is that the thrust transmission mechanism and the centrifuge main shaft 4 are rotated synchronously, so that the hydraulic locking device has a simple structure and good locking reliability.

[0036] The mold loading and unloading device adopts a six-claw hydraulic device, including a base 17, a column 18, a clamping claw 19, a clamping claw installation mechanism and a clamping claw control mechanism. Figure 2 、 Figure 3As shown, the column 18 is mounted on the base 17 through a movable plate 20, and the lower plane of the movable plate 20 and the upper plane of the base 17 are connected with each other by slide rails 21 and slide grooves. A movable plate control device is provided between the movable plate 20 and the base 17 to control the column 18 to move axially along the centrifuge main shaft 4; the clamping jaw mounting mechanism includes a clamping jaw mounting plate 22 and a clamping jaw mounting body 23. The right plane of the clamping jaw mounting plate 22 is fixedly mounted on the left end of the clamping jaw mounting body 23, and six radial slide grooves 24 for slidingly mounting the clamping jaw 19 are evenly arranged in the circumferential direction of the left plane of the clamping jaw mounting plate 22. The clamping jaw mounting body 23 is mounted on the column 18 through a lifting mechanism, and the clamping jaw mounting body 23 is controlled to drive the clamping jaw mounting plate 22, the clamping jaw 19, and the clamping jaw control mechanism to move up and down as a whole; the clamping jaw control mechanism includes a hydraulic cylinder 25 and a connecting rod control mechanism. The hydraulic cylinder 25 is fixedly mounted on the clamping jaw mounting plate At the right end of the body 23, there are six hydraulic cylinders 25, which are evenly distributed in the circumferential direction of the clamp mounting body 23, and are grouped into three groups that are evenly distributed in the circumferential direction of the clamp mounting body 23 to form two groups of synchronous control. The piston rods of the six hydraulic cylinders 25 are respectively connected to the six clamps 19 through a connecting rod control mechanism. The six clamps 19 are grouped into a mold clamp group and a spherical blank clamp group with three synchronously controlled clamps 19 among them. The three clamps 19 of the mold clamp group are synchronously controlled by three hydraulic cylinders 25, and the three clamps 19 of the spherical blank clamp group are synchronously controlled by another three hydraulic cylinders 25. The axial length of the three clamps 19 of the mold clamp group is smaller than the axial length of the three clamps of the spherical blank clamp group, so that when the three clamps 19 of the mold clamp group are stretched to clamp the right half mold 3, the three clamps of the spherical blank clamp group can clamp the spherical blank 40 at the same time.

[0037] The technical effect produced by this technical feature is that the mold loading and unloading device adopts a six-claw hydraulic device. When demolding, three of the claws 19 clamp the right half mold 3, and the other three claws 19 clamp the spherical blank 40, thereby realizing automatic demolding of the spherical blank 40 and the inner mold. When installing the inner mold, three of the claws 19 clamp the right half mold 3, and automatically load the right half mold 3 into the outer mold 1, thereby realizing automatic demolding and loading. Demolding and loading are convenient and reliable, and the production efficiency is high.

[0038] The connecting rod control mechanism includes an adjusting rod 26, a rotating angle plate 27, and a chain plate 28. The adjusting rod 26, the rotating angle plate 27, and the chain plate 28 have the same number as the clamping jaws 19. The corners of the six rotating angle plates 27 are evenly rotatably mounted on the outer circumference of the clamping jaw mounting plate 22. The two ends of the adjusting rod 26 are respectively hinged to the piston rod of the hydraulic cylinder 25 and one end of the rotating angle plate 27. The two ends of the chain plate 28 are respectively hinged to the other end of the rotating angle plate 27 and the clamping jaw 19. The adjusting rod 26 has an axial telescopic adjustment device, such as Figure 2As shown; the axial telescopic adjustment device is composed of an adjusting screw 50 and an adjusting nut 51 set between the adjusting rod 26 and the rotating angle plate 27. One end of the adjusting screw 50 is hinged to the rotating angle plate 27, and the other end is provided with a thread that cooperates with the adjusting nut 51. The adjusting nut 51 and the adjusting rod 26 are rotatably connected. By rotating the adjusting nut 51 clockwise or counterclockwise, the distance between the adjusting rod 26 and the rotating angle plate 27 is adjusted to achieve the same distance between the six hydraulic cylinders 25 and the rotating angle plates 27 connected to them; when the piston rod of the hydraulic cylinder 25 contracts, the adjusting rod 26 pulls the rotating angle plate 27 to rotate clockwise, and the chain plate 28 pulls the clamping jaw 19 to move radially and expand. When the piston rod of the hydraulic cylinder 25 is pushed out, the adjusting rod 26 pushes the rotating angle plate 27 to rotate counterclockwise, and the chain plate 28 pushes the clamping jaw 19 to move radially and contract, thereby realizing the telescopic control of the clamping jaw 19.

[0039] The technical effect produced by this technical feature is that the six hydraulic cylinders 25 respectively transmit the six clamps 19 through the telescopic adjustment rods 26, the radial movement consistency of the clamps 19 is high, and the clamping effect on the spherical blank 40 and the right half mold 3 is good.

[0040] The movable plate control device is composed of a servo motor 29, a sprocket, and a chain 30. The sprocket is composed of a driving sprocket 31 and a driven sprocket 32, which are installed on the base 17 through a rotating shaft 33. The driving sprocket 31 is connected to the servo motor 29. Both ends of the chain 30 can be driven and installed on the driving sprocket 31 and the driven sprocket 32. The upper side of the chain 30 is connected to the movable plate 20. The driven sprocket 32 ​​is installed on the base 17 with an adjustable rotating shaft to ensure that the distance between the driving sprocket 31 and the driven sprocket 32 ​​is reliably matched with the chain 30. The driving sprocket is driven by the servo motor 29. 31 rotates, and the movable plate 20 moves left and right through the chain 30; the lifting mechanism is composed of a lifting servo motor 34, a lifting sprocket, and a lifting chain 35. The lifting sprocket is composed of a driving wheel 36 and a driven wheel 37, which are installed at the upper and lower ends of the column 18 through a rotating shaft. The driving wheel 36 is connected to the lifting servo motor 34 for transmission. Both ends of the lifting chain 35 can be driven and installed on the driving wheel 36 and the driven wheel 37. One side of the lifting chain 35 is connected to the clamping claw mounting body 23. The clamping claw mounting body 23 and the column 18 are connected to each other using a lifting guide rail 38 and a lifting guide groove. Figure 2 、 Figure 3 As shown, the lifting servo motor 34 drives the lifting sprocket and the lifting chain 35 to drive the clamping jaw mounting body 23 to move up and down on the column 18 to control the height of the clamping jaw 19.

[0041] The technical effect produced by this technical feature is that the servo motor 29 and the lifting servo motor 34 are used to control the axial movement and the up and down movement of the clamping jaws 19 respectively, and the demoulding and the molding are automatically controlled. The structure is simple and the reliability is high.

[0042] A rotating device is provided between the column 18 and the movable plate 20. The rotating device is composed of a rotating servo motor 39 and a transmission mechanism between the rotating servo motor shaft and the column 18. The housing of the rotating servo motor 39 is fixedly mounted in the movable plate 20, and its rotating shaft is connected to the lower end of the column 18 through a transmission mechanism. Figure 2 As shown, the transmission mechanism can adopt a gear transmission mechanism between the column 18 and the rotating shaft of the rotary servo motor. The rotary servo motor 39 drives the column 18, the clamping jaw mounting body 23 and the clamping jaw 19 to rotate integrally, rotating the mold and the spherical blank 40 to the loading and unloading position, thereby realizing mold loading and unloading control.

[0043] The technical effect produced by this technical feature is that, by automatically controlling the direction of the clamping jaws 19, the automatic clamping of the right half mold 3 and the automatic unloading of the right half mold 3 and the spherical blank 40 are facilitated, thereby improving the degree of automated operation and production efficiency.

[0044] The ends of the three clamping jaws 19 of the spherical blank clamping jaw group are provided with radial top blocks, and the ends of the three radial top blocks are on the same circumferential surface. When the clamping jaws 19 are radially contracted, the outer circumferential surface diameters of the ends of the three radial top blocks are smaller than the diameter of the casting hole 8. When the three clamping jaws 19 are radially expanded in the spherical casting cavity 7, the outer circumferential surface diameters of the ends of the three radial top blocks are larger than the inner hole diameter of the spherical blank 40, ensuring that the spherical blank 40 is reliably expanded and tightened; a clamping hole 41 concentric with the casting hole 8 is provided at the right end of the right half mold 3, and the diameter of the clamping hole 41 is larger than the diameter of the casting hole 8, and an annular step 42 is formed between the clamping hole 41 and the casting hole 8, as shown in FIG. Figure 1 、 Figure 4 As shown; the length of the three jaws of the mold jaw group is smaller than the length of the three jaws of the spherical blank jaw group. When the ends of the three jaws of the mold jaw group touch the annular step 42, the radial top blocks of the three jaws of the spherical blank jaw group extend into the inner cavity of the spherical casting cavity 7, ensuring that when demolding, the spherical blank 40 and the right half mold 3 are simultaneously stretched and tightened by the corresponding jaws 19; the three jaws of the mold jaw group and the three jaws of the spherical blank jaw group can also be of equal length. When this structure is adopted, the three jaws of the mold jaw group stretch and tighten the inner hole wall of the casting hole 8 to achieve tightening of the right half mold 3.

[0045] The technical effect produced by this technical feature is that the clamping jaws 19 can clamp the spherical blank 40 and the right half mold 3 at the same time, and the clamping is reliable and stable.

[0046] In the above embodiment, the outer mold 1 and the left half mold 2 can adopt an integrated structure, such as Figure 5As shown, in this case, when casting each spherical blank 40 of different diameters, the entire mold needs to be removed from the centrifuge and replaced with a new mold, which increases the mold loading and unloading time and the number of molds, reduces production efficiency, and the outer mold 1 needs to use high-temperature steel material, which increases the mold manufacturing cost. Therefore, this structure also falls within the scope of protection of the present invention.

[0047] In the above embodiment, the inner mold can also be simply composed of the left half mold 2 and the right half mold 3, that is, the inner mold does not have an axial hole casting rod 5. The spherical blank 40 cast with this structure requires processing the valve stem mounting hole, which increases the processing steps and material loss. Therefore, this structure that reduces the number of components and correspondingly reduces the effect of the invention falls within the scope of protection of the present invention.

[0048] In the present invention, directional words and phrases such as "left", "right", "up", "down", "left end", "right end", "left plane", "right plane", "upper plane", and "lower plane" are with respect to the directions in the accompanying drawings for the convenience of description and should not be regarded as limitations of the present invention.

Claims

1. An automatic centrifugal casting device for a ball valve ball, comprising a mold, a mold locking device, and a mold loading and unloading device, wherein the mold is composed of an outer mold (1) and an inner mold, the outer mold (1) being made of ordinary steel material, and the inner mold being made of high-temperature resistant steel material, the outer mold (1) being composed of a mounting plate fixedly connected to a centrifuge main shaft (4) and an inner mold mounting cavity (6), and the inner mold being locked and mounted in the inner mold mounting cavity (6) of the outer mold (1) by the mold locking device; and characterized in that: The inner mold is composed of a left half mold (2), a right half mold (3) and an axial hole casting rod (5), and the whole is locked and installed in the inner mold installation cavity (6) by a mold locking device; a hemispherical inner cavity is symmetrically set on one side of the contact surface of the left half mold (2) and the right half mold (3), and the two are spliced ​​to form a spherical casting cavity (7), the axial hole casting rod (5) is installed between the left half mold (2) and the right half mold (3), and a casting hole (8) communicating with the hemispherical inner cavity is provided in the center of the right half mold (3) in the diameter direction of the spherical casting cavity (7) perpendicular to the center line of the centrifuge main shaft (4).

2. The automatic centrifugal casting device for ball valve according to claim 1, characterized in that: A spherical inner core (43) is provided in the spherical casting cavity (7), and at least two radial positioning rods are provided on the outer spherical surface of the spherical inner core (43), and the radial positioning rods are fixedly pressed into the radial positioning holes between the left half mold (2) and the right half mold (3); the spherical inner core (43) has a central through hole (44), and the diameter of the central through hole (44) is larger than the diameter of the passage hole of the spherical blank (40); an annular casting cavity (45) is formed between the outer spherical surface of the spherical inner core (43) and the inner cavity wall of the spherical casting cavity (7), and the annular casting cavity (45) is connected to the casting hole (8); The spherical inner core (43) has a hollow inner cavity (46), a radial positioning rod is fixedly welded on the radial outer spherical surface of the spherical inner core (43) perpendicular to the central through hole (44), and a radial exhaust pipe (47) is provided on the inner hole wall of the central through hole (44), one end of the radial exhaust pipe (47) is connected to the hollow inner cavity (46), and the other end radially extends to the center line of the central through hole (44); an axial hole casting cavity (48) adapted to the axial hole casting rod (5) is provided on the outer spherical surface of the spherical inner core (43), and a gap is provided between the outer peripheral surface of the axial hole casting rod (5) and the inner cavity wall of the axial hole casting cavity (48).

3. The automatic centrifugal casting device for ball valves according to claim 1 or 2, characterized in that: The mold locking device adopts a hydraulic locking device, including an oil cylinder (9), an oil cylinder push rod (10), a locking hook (11), and a thrust transmission mechanism connecting the oil cylinder push rod (10) and the locking hook (11). One end of the oil cylinder push rod (10) is located in the inner cavity of the oil cylinder (9), and the two form a piston structure. The outer cylindrical surface of the other end is clearance-matched with the inner wall of the center hole of the centrifuge main shaft (4). The oil cylinder push rod (10) and the oil cylinder (9) rotate synchronously with the centrifuge main shaft (4). The oil cylinder (9) is provided with working hydraulic pressure by the centrifuge hydraulic system. There are at least two locking hooks (11), which are evenly arranged on the mounting lugs (12) on the outer side of the right end face of the outer mold (1) in the circumferential direction.

4. The automatic centrifugal casting device for ball valves according to claim 3, characterized in that: The thrust transmission mechanism is composed of a connecting square plate (13), a locking disk (14), and a locking rod (15). One end of the connecting square plate (13) passes through a radial square hole (16) on the centrifuge main shaft (4) and is fixedly connected to the outer cylindrical surface of the oil cylinder push rod (10). The right plane of the connecting square plate (13) is fixedly connected to the left plane of the locking disk (14). One end of the locking rod (15) is hingedly mounted in the right plane of the locking disk (14), and the other end is hingedly mounted to the tail of the locking hook (11). The middle of the locking hook (11) is rotatably mounted on the mounting lug (12). The head of the locking hook (11) has a hook head that is locked with the right half mold (3). The number of the connecting square plates (13) and the locking rod (15) is equal to that of the locking hook (11).

5. The automatic centrifugal casting device for ball valves according to claim 3, characterized in that: The mold loading and unloading device adopts a six-claw hydraulic device, including a base (17), a column (18), a clamp (19), a clamp mounting mechanism and a clamp control mechanism, the column (18) is mounted on the base (17) through a movable plate (20), the lower plane of the movable plate (20) and the upper plane of the base (17) are connected to each other by a slide rail (21) and a slide groove, and a movable plate control device is provided between the movable plate (20) and the base (17); the clamp mounting mechanism includes a clamp mounting plate (22) and a clamp mounting body (23), the right plane of the clamp mounting plate (22) is fixedly mounted on the left end of the clamp mounting body (23), and the left plane of the clamp mounting plate (22) is evenly provided with six sliding mounting rails in the circumferential direction. The radial slide groove (24) of the clamping jaw (19) and the clamping jaw mounting body (23) are mounted on the column (18) through a lifting mechanism; the clamping jaw control mechanism includes a hydraulic cylinder (25) and a connecting rod control mechanism. The hydraulic cylinder (25) is fixedly mounted on the right end of the clamping jaw mounting body (23). The hydraulic cylinder (25) has six, which are evenly distributed in the circumferential direction of the clamping jaw mounting body (23) and are grouped into three groups evenly distributed in the circumferential direction to form two synchronously controlled groups. The piston rods of the six hydraulic cylinders (25) are respectively connected to the six clamping jaws (19) through the connecting rod control mechanism. The six clamping jaws (19) are grouped into a mold clamping jaw group and a spherical blank clamping jaw group with three of the clamping jaws (19) being synchronously controlled.

6. The automatic centrifugal casting device for ball valves according to claim 5, characterized in that: The connecting rod control mechanism includes an adjusting rod (26), a rotating angle plate (27), and a chain plate (28). The number of the adjusting rod (26), the rotating angle plate (27), and the chain plate (28) is the same as that of the clamping jaws (19). The corners of the six rotating angle plates (27) are evenly rotatably mounted on the outer circumference of the clamping jaw mounting plate (22). The two ends of the adjusting rod (26) are respectively hinged to the piston rod of the hydraulic cylinder (25) and one end of the rotating angle plate (27). The two ends of the chain plate (28) are respectively hinged to the other end of the rotating angle plate (27) and the clamping jaw (19). The adjusting rod (26) has an axial telescopic adjustment device.

7. The automatic centrifugal casting device for ball valves according to claim 5 or 6, characterized in that: The movable plate control device is composed of a servo motor (29), a sprocket, and a chain (30). The sprocket is composed of a driving sprocket (31) and a driven sprocket (32), which are installed on the base (17) through a rotating shaft (33). The driving sprocket (31) is connected to the servo motor (29) in a transmission manner. The chain (30) can be installed on the driving sprocket (31) and the driven sprocket (32). The upper side of the chain (30) is connected to the movable plate (20). The lifting mechanism is composed of a lifting servo motor (34), a lifting sprocket, ... The lifting chain (35) is composed of a driving wheel (36) and a driven wheel (37), which are installed on the upper and lower ends of the column (18) through a rotating shaft. The driving wheel (36) is connected to the lifting servo motor (34) in a transmission manner. The lifting chain (35) can be installed on the driving wheel (36) and the driven wheel (37). One side of the lifting chain (35) is connected to the clamping claw mounting body (23). The clamping claw mounting body (23) and the column (18) are connected to each other by a lifting guide rail (38) and a lifting guide groove.

8. The automatic centrifugal casting device for ball valves according to claim 5 or 6, characterized in that: A rotating device is provided between the column (18) and the movable plate (20), and the rotating device is composed of a rotating servo motor (39) and a transmission mechanism between the rotating servo motor shaft and the column (18). The housing of the rotating servo motor (39) is fixedly mounted in the movable plate (20), and the rotating shaft is connected to the lower end of the column (18) through the transmission mechanism.

9. The automatic centrifugal casting device for ball valves according to claim 5 or 6, characterized in that: The ends of the three clamping jaws (19) of the spherical blank clamping jaw group are provided with radial top blocks, and the ends of the three radial top blocks are on the same circumferential surface. When the clamping jaws (19) are radially contracted, the diameters of the outer circumferential surfaces of the ends of the three radial top blocks are smaller than the diameter of the casting hole (8). When the clamping jaws (19) are radially expanded, the diameters of the outer circumferential surfaces of the ends of the three radial top blocks are larger than the inner hole diameter of the spherical blank (40).

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