A diffuser casting mold and a working method thereof

Abstract

The application discloses a diffuser casting die and a working method thereof. The outer ring positioning block is coaxially arranged at the periphery of the inner ring positioning block. The outer ring positioning block comprises a plurality of outer ring positioning sub-blocks. The inner ring positioning block comprises a plurality of first and second inner ring positioning blocks. The first and second inner ring positioning blocks are arranged alternately. The positioning ring driving mechanism comprises first, second and third positioning ring driving mechanisms. The first positioning ring driving mechanism is connected with all the first inner ring positioning blocks. The second positioning ring driving mechanism is connected with all the second inner ring positioning blocks. The third positioning ring driving mechanism is connected with all the outer ring positioning sub-blocks and can drive all the outer ring positioning sub-blocks to move synchronously along the radial direction of the inner ring positioning block. The pouring gate is arranged on the outer ring positioning sub-block. The application can realize the integral casting of the diffuser, and improve the casting quality and production efficiency of the diffuser.

Description

Technical Field

[0001] This invention belongs to the field of integral casting of precision components for aero-engines, and relates to a diffuser casting mold and its working method. Background Technology

[0002] The diffuser is a crucial component in the combustion chamber of an aero-engine. It decelerates and pressurizes the high-speed airflow at the compressor exit, reducing total pressure loss, stabilizing combustion, and improving engine efficiency. With the increasing compressor pressure ratio and improved combustion chamber performance in aero-engines, new demands are placed on diffuser performance, requiring a reduction in total pressure loss while maximizing static pressure recovery. This makes diffuser structural design more complex, involving a larger number of blades and higher blade profile precision. The more blades there are, the more difficult the integral casting becomes. Due to its complex structure, numerous blades, and high dimensional accuracy requirements, the integral casting design of a certain aircraft diffuser using wax molds is extremely challenging. Currently, segmented casting followed by assembly is commonly used. This process involves numerous repetitive steps, high manual labor intensity, low product quality, and low production efficiency. Occasionally, a semi-mechanized integral mold design is employed, with manual operation of handles for mold opening / closing and ejection. However, this method remains inefficient, prone to human error, and results in inconsistent product quality. Summary of the Invention

[0003] To address the problems existing in the prior art, the present invention aims to provide a diffuser casting mold and its working method. The present invention can realize the integral casting of diffusers and improve the casting quality and production efficiency of diffusers.

[0004] The technical solution adopted in this invention is as follows:

[0005] A diffuser casting mold includes an upper cover plate, an outer ring positioning block, an inner ring positioning block, a mounting base, a positioning ring drive mechanism, an ejector mechanism, a blade-shaped pressure plate, and a blade-shaped module positioning base.

[0006] The outer ring positioning block is coaxially arranged around the inner ring positioning block, and the outer ring positioning block includes several outer ring positioning sub-blocks; the top material mechanism is arranged on the mounting base and located below the annular gap between the outer ring positioning block and the inner ring positioning block; the leaf-shaped module positioning base is arranged at the bottom of the annular gap between the outer ring positioning block and the inner ring positioning block; the upper cover plate is arranged above the outer ring positioning block and the inner ring positioning block; the leaf-shaped pressure plate is installed on the upper cover plate and located at the top of the annular gap between the outer ring positioning block and the inner ring positioning block.

[0007] The inner ring positioning block includes a plurality of first inner ring positioning blocks and a plurality of second inner ring positioning blocks, which are arranged alternately.

[0008] The positioning ring drive mechanism is mounted on the mounting base and includes a first positioning ring drive mechanism, a second positioning ring drive mechanism, and a third positioning ring drive mechanism. The first positioning ring drive mechanism is connected to all the first inner ring positioning blocks and can drive all the first inner ring positioning blocks to move synchronously along the radial direction of the inner ring positioning blocks. The second positioning ring drive mechanism is connected to all the second inner ring positioning blocks and can drive all the second inner ring positioning blocks to move synchronously along the radial direction of the inner ring positioning blocks. The third positioning ring drive mechanism is connected to all the outer ring positioning blocks and can drive all the outer ring positioning blocks to move synchronously along the radial direction of the inner ring positioning blocks.

[0009] The outer ring positioning block is equipped with a pouring port, which is connected to the annular gap between the outer ring positioning block and the inner ring positioning block.

[0010] Preferably, the upper cover plate is also provided with an outer ring positioning block pressure plate that is adapted to the outer edge contour of the outer ring positioning block. The outer ring positioning block pressure plate is used to limit the outer ring positioning block.

[0011] The upper cover plate is also provided with an inner ring positioning block pressure plate that matches the inner edge contour of the inner ring positioning block. The inner ring positioning block pressure plate is used to limit the inner ring positioning block.

[0012] Preferably, a first sliding tenon is installed on the mounting base, and the sliding direction of the first sliding tenon is along the radial direction of the inner ring positioning block;

[0013] The first inner ring positioning block is connected to the first sliding tenon;

[0014] The first positioning ring drive mechanism includes a turntable and a first connecting rod. The two ends of the first connecting rod are respectively hinged to the first sliding tenon and the turntable. The turntable is mounted on the mounting base, and the rotation axis of the turntable is coaxial with the axis of the inner ring positioning block.

[0015] Preferably, the mounting base is equipped with a second sliding tenon and a third sliding tenon, the sliding direction of the second sliding tenon and the third sliding tenon is along the radial direction of the inner ring positioning block, the second inner ring positioning block is connected to the second sliding tenon, and the outer ring positioning block is connected to the third sliding tenon;

[0016] The second positioning ring drive mechanism and the third positioning ring drive mechanism adopt the same drive structure, which includes a flower plate and a flower plate drive mechanism. The flower plate is rotatably connected to the mounting base. The rotating shaft of the flower plate is coaxial with the axis of the inner ring positioning block. The flower plate drive mechanism is connected to the flower plate and is used to drive the flower plate to rotate.

[0017] Each second and third sliding tenon is connected to a sliding rod perpendicular to the flower plate. The flower plate has a sliding hole for the sliding rod to pass through and cooperate with the sliding rod. The sliding hole is an arc-shaped elongated hole.

[0018] When the flower plate rotates, it can drive the sliding rod, the second sliding tenon, and the third sliding tenon to move simultaneously, so that all outer ring positioning blocks move radially outward synchronously, and all second inner ring positioning blocks move radially inward synchronously; or when the flower plate rotates, it can drive the sliding rod, the second sliding tenon, and the third sliding tenon to move simultaneously, so that all outer ring positioning blocks move radially inward synchronously, and all second inner ring positioning blocks move radially outward synchronously.

[0019] Preferably, a sliding bearing that mates with a sliding hole is fitted onto the slide rod, and the sliding bearing and the sliding hole are in a clearance fit.

[0020] Preferably, the flower disc drive mechanism includes an arc-shaped rack disposed on the outer edge of the flower disc, a gear, and a gear drive mechanism, wherein the gear meshes with the arc-shaped rack, and the gear drive mechanism is connected to the gear.

[0021] Preferably, the gear drive mechanism includes a rack and a cylinder. The rack is slidably connected to the mounting base. The push rod of the cylinder is connected to one end of the rack via a connecting shaft. The connecting shaft is axially connected to both the rack and the push rod of the cylinder. The cylinder can drive the rack to reciprocate. The gear is rotatably connected to the mounting base. The gear and the rack, as well as the arc-shaped rack, are externally meshed.

[0022] Preferably, the ejector mechanism includes an ejector plate, an ejector plate drive mechanism, an outer ring ejector block, and an inner ring ejector block. The outer ring ejector block and the inner ring ejector block are both fixed on the ejector plate. The outer ring ejector block is used to eject the outer edge of the casting during ejection, and the inner ring ejector block is used to eject the inner edge of the casting during ejection. A plurality of the outer ring ejector blocks and the inner ring ejector blocks are evenly arranged along the circumferential direction on the ejector plate.

[0023] The ejector plate is located below the flower plate. Both the outer ring top block and the inner ring top block penetrate the flower plate. The flower plate has through holes for the outer ring top block and the inner ring top block to pass through. These through holes are arc-shaped elongated holes that are coaxial with the flower plate.

[0024] The ejector plate drive mechanism is connected to the ejector plate, and the ejector plate drive mechanism can drive the ejector plate to move along the axial direction of the disc.

[0025] Preferably, the ejector plate is provided with a number of guide blocks evenly distributed along the circumference, and the flower plate is provided with through holes for the guide blocks to pass through. The through holes are arc-shaped elongated holes coaxial with the flower plate, and the guide blocks and the through holes are clearance fits. The ejector plate drive mechanism is a cylinder, and a number of cylinders are evenly connected in the circumference of the bottom of the ejector plate. The push rods of the cylinders are connected to the ejector plate.

[0026] The working method of the diffuser casting mold of the present invention as described above includes the following process:

[0027] Mold opening process: Remove the top cover plate, drive all the first inner ring positioning blocks to move synchronously towards the center of the inner ring positioning block through the first positioning ring drive mechanism, then drive all the second inner ring positioning blocks to move synchronously towards the center of the inner ring positioning block through the second positioning ring drive mechanism, and drive all the outer ring positioning blocks to move away from the center of the inner ring positioning block through the third positioning ring drive mechanism. When the first inner ring positioning block, the second inner ring positioning block and the outer ring positioning blocks all reach the set position, the mold is fully opened. The wax model is ejected through the ejector mechanism to complete the mold opening process and remove the wax model.

[0028] Mold closing process: The ejector mechanism returns to its original position before ejection. The first positioning ring drive mechanism drives all the first inner ring positioning blocks to move synchronously away from the center of the inner ring positioning block and reach the stop position. Then, the second positioning ring drive mechanism drives all the second inner ring positioning blocks to move synchronously away from the center of the inner ring positioning block and reach the stop position. At this time, all the first inner ring positioning blocks and the second inner ring positioning blocks are assembled into the inner ring positioning block. The third positioning ring drive mechanism drives all the outer ring positioning blocks to move towards the center of the inner ring positioning block and reach the stop position. All the outer ring positioning blocks are assembled into the outer ring positioning block. The upper cover plate is placed on the upper part of the outer ring positioning block and the inner ring positioning block, so that the leaf-shaped pressure plate seals the top of the ring gap between the outer ring positioning block and the inner ring positioning block, thus completing the mold closing process.

[0029] The pouring and cooling process: After the mold closing process is completed, wax liquid is injected into the cavity formed by the outer ring positioning block, inner ring positioning block, blade pressure plate and blade module positioning base through the pouring port. After the wax liquid solidifies, the mold opening process is carried out.

[0030] The present invention has the following beneficial effects:

[0031] In the diffuser casting mold of this invention, both the outer ring positioning block and the inner ring positioning block are set as split structures. That is, the inner ring positioning block is decomposed into several first inner ring positioning blocks and several second inner ring positioning blocks, and the outer ring positioning block is decomposed into several outer ring positioning sub-blocks. Therefore, by using the first positioning ring driving mechanism, the second positioning ring driving mechanism, and the third positioning ring driving mechanism to drive these split structures, the outer ring positioning block and the inner ring positioning block can be brought together or dispersed to meet the requirements of mold closing and mold opening. At the same time, since the inner ring positioning block needs to be brought together when the mold is closed, it cannot move all the outer ring positioning sub-blocks synchronously like the outer ring positioning block, which would cause positional interference. Therefore, this invention sets the inner ring positioning block into two types (i.e., the first inner ring positioning block and several second inner ring positioning blocks). The first inner ring positioning block is synchronously brought together or dispersed by the first positioning ring driving mechanism, and the several second inner ring positioning blocks are synchronously brought together or dispersed by the second positioning ring driving mechanism. In this way, controlling the time difference between the action of the first positioning ring driving mechanism and the second positioning ring driving mechanism can effectively avoid positional interference when the first inner ring positioning block and the second inner ring positioning block move. It is evident that the present invention can synchronously control the outer ring positioning block and the inner ring positioning block through a mechanical structure, which can avoid direct manual intervention by personnel. Moreover, these control mechanisms (the first, second and third positioning ring drive mechanisms) can all be controlled through an electromechanical structure, which greatly improves production efficiency and ensures the casting quality of the diffuser. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the diffuser casting mold of the present invention;

[0033] Figure 2 This is a schematic diagram of the leaf-shaped cavity of the present invention;

[0034] Figure 3 This is a schematic diagram of the inner / outer positioning blocks of the present invention;

[0035] Figure 4 This is a schematic diagram of the sliding tenon and pressure plate of the present invention;

[0036] Figure 5 This is a schematic diagram of the flower plate and top block of the present invention;

[0037] Figure 6 This is a schematic diagram of the turntable connection of the present invention;

[0038] Figure 7 This is a schematic diagram of the rack and pinion transmission mechanism of the present invention;

[0039] Figure 8 This is a schematic diagram of the ejection mechanism of the present invention;

[0040] Figure 9 This is a schematic diagram of the pad and cylinder of the present invention;

[0041] Figure 10This is a schematic diagram of the overall structure of the present invention;

[0042] Figure 11 This is the PLC program control diagram used in the embodiments of the present invention;

[0043] In the diagram, 1-top cover plate, 2-outer ring positioning block pressure plate, 3-inner ring positioning block pressure plate, 4-blade-shaped module assembly, 5-blade-shaped pressure plate, 6-outer ring positioning block, 7-blade-shaped module positioning base, 8-inner ring positioning block, 8-1-first inner ring positioning block, 8-2-second inner ring positioning block, 9-first screw, 10-pouring port, 11-first sliding tenon, 12-first pressure plate, 13-second sliding tenon, 14-second pressure plate, 15-third sliding tenon, 16-third pressure plate, 17-first connecting rod, 18-turntable, 19-blade-shaped positioning base, 20-flower disc, 20-1-sliding hole, 21-sliding rod, 22-third sliding bearing, 23 24-Outer ring top block, 25-Inner ring top block, 26-Guide block, 27-First sliding bearing, 28-First pin, 29-Second sliding bearing, 30-Second pin, 31-Busset, 32-Central shaft, 33-Second screw, 34-Bearing, 35-Third screw, 36-Adapter plate, 37-First pad, 38-Lifting lug, 39-Arched rack, 40-Gear, 41-Rack, 42-Second cylinder, 43-Fixing ring, 44-Base, 45-Ejector plate, 46-Third cylinder, 47-Support plate, 48-Second pad, 49-First cylinder, 50-Box body, 51-Control panel. Detailed Implementation

[0044] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0045] See Figures 1-10The diffuser casting mold of the present invention includes an upper cover plate 1, an outer ring positioning block 6, an inner ring positioning block 8, a mounting base, a positioning ring driving mechanism, an ejector mechanism, a blade-shaped pressure plate 5, and a blade-shaped module positioning base 7; the outer ring positioning block 6 is coaxially arranged around the inner ring positioning block 8, and the outer ring positioning block 6 includes several outer ring positioning sub-blocks; the ejector mechanism is arranged on the mounting base and located below the annular gap between the outer ring positioning block 6 and the inner ring positioning block 8, and the blade-shaped module positioning base 7 is arranged at the bottom of the annular gap between the outer ring positioning block 6 and the inner ring positioning block 8; the upper cover plate 1 is arranged above the outer ring positioning block 6 and the inner ring positioning block 8, and the blade-shaped pressure plate 5 is installed on the upper cover plate 1 and located at the top of the annular gap between the outer ring positioning block 6 and the inner ring positioning block 8; the inner ring positioning block 8 includes several first inner ring positioning blocks 8-1 and several second inner ring positioning blocks 8-2, and several first inner ring positioning blocks 8-1... Inner ring positioning blocks 8-1 and several second inner ring positioning blocks 8-2 are arranged alternately; a positioning ring drive mechanism is set on the mounting base, including a first positioning ring drive mechanism, a second positioning ring drive mechanism and a third positioning ring drive mechanism. The first positioning ring drive mechanism is connected to all first inner ring positioning blocks 8-1 and can drive all first inner ring positioning blocks 8-1 to move synchronously along the radial direction of the inner ring positioning block 8; the second positioning ring drive mechanism is connected to all second inner ring positioning blocks 8-2 and can drive all second inner ring positioning blocks 8-2 to move synchronously along the radial direction of the inner ring positioning block 8; the third positioning ring drive mechanism is connected to all outer ring positioning blocks and can drive all outer ring positioning blocks to move synchronously along the radial direction of the inner ring positioning block 8; a pouring port 10 is provided on the outer ring positioning block, and the pouring port 10 is connected to the annular gap between the outer ring positioning block 6 and the inner ring positioning block 8.

[0046] The working method of the diffuser casting mold of the present invention as described above includes the following process:

[0047] Mold opening process: Remove the upper cover plate 1, drive all the first inner ring positioning blocks 8-1 to move synchronously towards the center of the inner ring positioning block 8 through the first positioning ring drive mechanism, then drive all the second inner ring positioning blocks 8-2 to move synchronously towards the center of the inner ring positioning block 8 through the second positioning ring drive mechanism, and drive all the outer ring positioning blocks to move away from the center of the inner ring positioning block 8 through the third positioning ring drive mechanism. When the first inner ring positioning block 8-1, the second inner ring positioning block 8-2 and the outer ring positioning blocks all reach the set position, the mold is fully opened, and the wax model is ejected through the ejector mechanism to complete the mold opening process and remove the wax model.

[0048] Mold closing process: The ejector mechanism returns to its original position before ejection. The first positioning ring drive mechanism drives all the first inner ring positioning blocks 8-1 to move synchronously away from the center of the inner ring positioning block 8 and reach the stop position. Then, the second positioning ring drive mechanism drives all the second inner ring positioning blocks 8-2 to move synchronously away from the center of the inner ring positioning block 8 and reach the stop position. At this time, all the first inner ring positioning blocks 8-1 and the second inner ring positioning blocks 8-2 are assembled to form the inner ring positioning block 8. The third positioning ring drive mechanism drives all the outer ring positioning blocks to move towards the center of the inner ring positioning block 8 and reach the stop position. All the outer ring positioning blocks are assembled to form the outer ring positioning block 6. The upper cover plate 1 is placed over the upper part of the outer ring positioning block 6 and the inner ring positioning block 8, so that the leaf-shaped pressure plate 5 seals the top of the annular gap between the outer ring positioning block 6 and the inner ring positioning block 8, thus completing the mold closing process. During the mold closing process, the closing order of the first inner ring positioning blocks 8-1 and the second inner ring positioning blocks 8-2 can also be reversed.

[0049] The pouring and cooling process: After the mold closing process is completed, wax liquid is injected into the cavity formed by the outer ring positioning block 6, the inner ring positioning block 8, the blade pressure plate 5 and the blade module positioning base 7 through the pouring port 10. After the wax liquid solidifies, the mold opening process is carried out.

[0050] In a preferred embodiment of the present invention, the upper cover plate 1 is further provided with an outer ring positioning block pressure plate 2 that matches the outer edge contour of the outer ring positioning block 6, and the outer ring positioning block pressure plate 2 is used to limit the outer ring positioning block 6; the upper cover plate 1 is also provided with an inner ring positioning block pressure plate that matches the inner edge contour of the inner ring positioning block 8, and the inner ring positioning block pressure plate is used to limit the inner ring positioning block 8. The present invention, through the outer ring positioning block pressure plate 2 and the inner ring positioning block pressure plate 3, can lock the outer ring positioning block 6 and the inner ring positioning block 8 in place after mold closing, ensuring the dimensional accuracy of the casting cavity, and thus ensuring the dimensional accuracy of the wax model.

[0051] As an optional embodiment of the present invention, the closing and opening of the first inner ring positioning block 8-1 in the inner ring positioning block 8 can be achieved by the following scheme: Specifically, a first sliding tenon 11 is installed on the mounting base, and the sliding direction of the first sliding tenon 11 is along the radial direction of the inner ring positioning block 8. The first inner ring positioning block 8-1 is connected to the first sliding tenon 11. The first positioning ring driving mechanism includes a turntable 18 and a first connecting rod 17. The two ends of the first connecting rod 17 are respectively hinged to the first sliding tenon 11 and the turntable 18. The turntable 18 is installed on the mounting base, and the rotation axis of the turntable 18 is coaxial with the axis of the inner ring positioning block 8. The working principle of the above structure is as follows: When the drive turntable 18 rotates, the turntable 18 drives the first connecting rod 17 to move. The first connecting rod 17 drives the first sliding tenon 11 to slide closer to or away from the center of the inner ring positioning block 8, thereby realizing the closing or opening action of the first inner ring positioning block 8-1. By controlling the forward and reverse rotation of the turntable 18, the closing or opening action of the first inner ring positioning block 8-1 can be realized. A first pressure plate 12 is provided on the mounting base near the groove of the first sliding tenon 11 to ensure that the first sliding tenon 11 is always in the groove.

[0052] As an optional embodiment of the present invention, in the above embodiment, one end of the first connecting rod 17 is connected to the first sliding tenon 11 by a first pin 27, and a first sliding bearing 26 is sleeved on the first pin 27 at the connecting part. The other end of the first connecting rod 17 is connected to the turntable 18 by a second pin 29, and a second sliding bearing 28 is sleeved on the second pin 29 at the connecting part.

[0053] As an optional embodiment of the present invention, the closing and opening of the second inner ring positioning block 8-2 in the outer ring positioning block 6 and the inner ring positioning block 8 can be achieved by the following scheme: Specifically, a second sliding tenon 13 and a third sliding tenon 15 are installed on the mounting base. The sliding direction of the second sliding tenon 13 and the third sliding tenon 15 is along the radial direction of the inner ring positioning block 8. The second inner ring positioning block 8-2 is connected to the second sliding tenon 13, and the outer ring positioning block is connected to the third sliding tenon 15. The second positioning ring driving mechanism and the third positioning ring driving mechanism adopt the same driving structure, which includes a flower plate 20 and a flower plate driving mechanism. The flower plate 20 is rotatably connected to the mounting base. The rotation axis of the flower plate 20 is coaxial with the axis of the inner ring positioning block 8. The flower plate driving mechanism is connected to the flower plate 20 and is used to drive the flower plate 20 to rotate. Each second sliding tenon 13 and the third sliding tenon 15 is connected to a sliding rod 21 perpendicular to the flower plate 20. The flower plate 20 has a groove for the sliding rod 21 to pass through and connect with the flower plate 20. The sliding hole 20-1, which is an arc-shaped elongated hole, allows the sliding rod 21 and the sliding hole 20-1 to work together to drive the sliding rod 21 to move during the rotation of the flower plate 20. The sliding rod 21 then drives the corresponding sliding tenon to slide, thereby controlling the synchronous movement of the outer ring positioning blocks and the second inner ring positioning blocks 8-2. The working process of the above structure is as follows: When the flower plate 20 rotates, it drives the sliding rod 21, the second sliding tenon 13, and the third sliding tenon 15 to move simultaneously, so that all the outer ring positioning blocks move synchronously radially outward (i.e., spread out), and all the second inner ring positioning blocks 8-2 move synchronously radially inward (i.e., spread out); or when the flower plate 20 rotates, it can drive the sliding rod 21, the second sliding tenon 13, and the third sliding tenon 15 to move simultaneously, so that all the outer ring positioning blocks move synchronously radially inward (i.e., close together), and all the second inner ring positioning blocks 8-2 move synchronously radially outward (i.e., close together). A first pressure plate 12 is provided on the mounting base near the grooves of the second sliding tenon 13 and the third sliding tenon 15 to ensure that the second sliding tenon 13 and the second sliding tenon 15 are always in their respective grooves.

[0054] In a preferred embodiment of the present invention, a sliding bearing is fitted onto the slide rod 21 to mate with the sliding hole 20-1, and the sliding bearing and the sliding hole 20-1 are in a clearance fit. The sliding bearing achieves the effect of wear resistance and flexible movement.

[0055] As an optional embodiment of the present invention, the flower disc driving mechanism in the above structure can take the following form: the flower disc driving mechanism includes an arc-shaped rack 38, a gear 39, and a gear driving mechanism disposed on the outer edge of the flower disc 20. The gear 39 meshes with the arc-shaped rack 38, and the gear driving mechanism is connected to the gear 39. The working principle of this structure is as follows: the gear driving mechanism drives the gear 39 to rotate, and the gear 39 drives the arc-shaped rack 38 to rotate the flower disc 20. By driving the gear 39 to rotate forward and backward, the closing and opening of the second inner ring positioning block 8-2 in the outer ring positioning block 6 and the inner ring positioning block 8 can be realized.

[0056] As an optional embodiment of the present invention, the gear drive mechanism in the above structure can take the following form: the gear drive mechanism includes a rack 40 and a cylinder. The rack 40 is slidably connected to the mounting base. The push rod of the cylinder is connected to one end of the rack 40 through a connecting shaft 41. The connecting shaft 41, the rack 40, and the push rod of the cylinder are all shaft connections. The cylinder can drive the rack 40 to reciprocate. The gear 39 is rotatably connected to the mounting base. The gear 39 is externally meshed with the rack 40 and the arc-shaped rack 38. The working principle of this structure is as follows: the cylinder drives the rack 40 to slide, the rack 40 drives the gear 39 to rotate, the gear 39 drives the arc-shaped rack 38 to drive the disc 20 to rotate, and the cylinder drives the rack 40 to reciprocate, realizing the forward and reverse rotation of the gear 39, which can realize the closing and opening of the second inner ring positioning block 8-2 in the outer ring positioning block 6 and the inner ring positioning block 8. The connecting shaft 41, rack 40, and cylinder push rod are all shaft-connected, which prevents jamming when the cylinder drives rack 40 to slide.

[0057] As a preferred embodiment of the present invention, the ejector mechanism of the present invention may take the following form: the ejector mechanism includes an ejector plate 45, an ejector plate driving mechanism, an outer ring ejector block 23 and an inner ring ejector block 24. The outer ring ejector block 23 and the inner ring ejector block 24 are both fixed on the ejector plate 45. The outer ring ejector block 23 is used to eject the outer edge of the casting during ejection, and the inner ring ejector block 24 is used to eject the inner edge of the casting during ejection. A plurality of the outer ring ejector blocks 23 and the inner ring ejector blocks 24 are evenly arranged on the ejector plate 45 along the circumferential direction. The ejector plate 45 is located below the flower plate 20. The outer ring top block 23 and the inner ring top block 24 both penetrate the flower plate 20. The flower plate 20 has through holes for the outer ring top block 23 and the inner ring top block 24 to pass through. The through holes are arc-shaped elongated holes coaxial with the flower plate. The arc-shaped elongated holes can prevent the flower plate 20 from interfering with the outer ring top block 23 and the inner ring top block 24. The ejector plate drive mechanism is connected to the ejector plate 45 and can drive the ejector plate 45 to move along the axial direction of the flower plate 20. The working principle of the ejector mechanism is as follows: The ejector plate drive mechanism drives the ejector plate 45 to move, and the ejector plate 45 synchronously drives the outer ring ejector block 23 and the inner ring ejector block 24 to move. After the mold opening process is completed, the ejector plate drive mechanism drives the ejector plate 45 to eject the outer ring ejector block 23 and the inner ring ejector block 24. Multiple outer ring ejector blocks 23 and inner ring ejector blocks 24 simultaneously push the outer edge and inner edge of the wax model to push the wax model out together. Before the mold closing process begins, the ejector plate 45 can be reset. The ejector plate drive mechanism can be a cylinder. Several cylinders are evenly connected in the circumferential direction at the bottom of the ejector plate 45, and the push rod of the cylinder is connected to the ejector plate 45.

[0058] As a preferred embodiment of the present invention, based on the above structure, the ejector plate 45 of the present invention is uniformly provided with a plurality of guide blocks 25 along the circumference, and the flower plate 20 is provided with a through hole for the guide blocks 25 to pass through. The through hole is an arc-shaped elongated hole coaxial with the flower plate. The arc-shaped elongated hole can avoid positional interference between the flower plate 20 and the guide blocks 25. The guide blocks 25 and the through holes are clearance fit. The setting of guide blocks 25 can ensure the stability of the positions of the outer ring top block 23 and the inner ring top block 24, prevent the ejection direction from deviating, and ensure smooth ejection.

[0059] As a preferred embodiment of the present invention, in the above-mentioned embodiment, six first inner ring positioning blocks 8-1 and six second inner ring positioning blocks 8-2 are provided, and the outer ring positioning block 6 is provided with 22 outer ring positioning sub-blocks.

[0060] As a preferred embodiment of the present invention, the above-described solution can achieve automatic mold opening / closing and ejection through PLC programming combined with electrical control, thereby realizing automated integral casting of the mold. (See [link to previous section]). Figure 11 The work process is as follows:

[0061] When button SB1 (mold opening) is pressed, the program-controlled solenoid valve YV-1 is activated, rotating the first cylinder to the set angle. The six inner ring positioning blocks open radially (moving towards the center of the disc) until they stop at the first cylinder's position switch setting. Then, the program-controlled solenoid valve YV-2 is activated, and the second cylinder drives the rack and gears, causing the pattern disc to rotate forward along the rack's direction (when viewed from above). This causes the six inner ring positioning blocks and 22 outer positioning blocks to open radially (moving away from the wax model) until they stop at the second cylinder's position switch setting, fully opening the mold. Next, the program-controlled solenoid valve YV-3 is activated, and the third cylinder (four cylinders) moves upward, ejecting the wax model. This causes the ejector plate and its ejector blocks (outer ring top block 23 and inner ring top block 24) to move upward, contacting the inner / outer ring bottom surface of the wax model. The wax model then moves upward simultaneously until it stops at the third cylinder's position switch setting, completing the mold opening process. The mold opening completion indicator KL1 illuminates, indicating mold opening is complete, and the operator removes the wax model.

[0062] When button SB2 (mold closing) is pressed, the program-controlled solenoid valve YV-3 closes, and the third cylinder resets until it stops at the third cylinder reset switch setting position. The program-controlled solenoid valve YV-2 closes, and the second cylinder resets, driving the gears to rotate the pattern disc in the opposite direction of the rack movement (when viewed from above), causing the 6 second inner ring positioning blocks and 22 outer positioning blocks to radially retract (moving towards the wax model) until they stop at the second cylinder reset switch setting position, fully closing. The program-controlled solenoid valve YV-1 closes, rotating the first cylinder in the opposite direction to its initial position, causing the 6 first inner ring positioning blocks to radially retract (moving away from the center of the disc) until they stop at the first cylinder reset switch setting position, completing the closing action of all inner / outer positioning blocks. The mold closing completion indicator KL2 illuminates, indicating that mold closing is complete.

[0063] When the mold is being opened or closed, if a cylinder fails to reach the position of the stop switch or reset switch within the specified time, the alarm light KL3 will flash, indicating that there is a malfunction in the mold opening or closing.

[0064] As can be seen from the above scheme, the mold of this invention can realize the electromechanical automation of integral casting of a diffuser. Through integral casting and programmable electromechanical design, the production cycle is significantly shortened, production efficiency is greatly improved, human error is reduced, accurate data control and controllable quality are achieved, while saving costs and ensuring high product stability. This invention can realize mechatronics design, program control to achieve accurate data control, improve product consistency and production stability; and use program-controlled cylinders to achieve mold opening and closing, reducing mechanical transmission mechanisms, reducing machining difficulty, and significantly reducing mold manufacturing costs. This invention can replace traditional split casting or mechanized integral molds, improve product production efficiency, reduce human error, and reduce product deviation rate and scrap rate.

Claims

1. A diffuser casting mold, characterized in that, It includes an upper cover plate (1), an outer ring positioning block (6), an inner ring positioning block (8), a mounting base, a positioning ring drive mechanism, a top material mechanism, a blade-shaped pressure plate (5), and a blade-shaped module positioning base (7). The outer ring positioning block (6) is coaxially arranged around the inner ring positioning block (8), and the outer ring positioning block (6) includes several outer ring positioning sub-blocks; the top material mechanism is arranged on the mounting base and located below the annular gap between the outer ring positioning block (6) and the inner ring positioning block (8); the leaf-shaped module positioning base (7) is arranged at the bottom of the annular gap between the outer ring positioning block (6) and the inner ring positioning block (8); the upper cover plate (1) is arranged above the outer ring positioning block (6) and the inner ring positioning block (8); the leaf-shaped pressure plate (5) is installed on the upper cover plate (1) and located at the top of the annular gap between the outer ring positioning block (6) and the inner ring positioning block (8); The inner ring positioning block (8) includes a plurality of first inner ring positioning blocks (8-1) and a plurality of second inner ring positioning blocks (8-2), with the plurality of first inner ring positioning blocks (8-1) and the plurality of second inner ring positioning blocks (8-2) arranged alternately; The positioning ring drive mechanism is mounted on the mounting base and includes a first positioning ring drive mechanism, a second positioning ring drive mechanism and a third positioning ring drive mechanism. The first positioning ring drive mechanism is connected to all the first inner ring positioning blocks (8-1) and can drive all the first inner ring positioning blocks (8-1) to move synchronously along the radial direction of the inner ring positioning block (8). The second positioning ring drive mechanism is connected to all the second inner ring positioning blocks (8-2) and can drive all the second inner ring positioning blocks (8-2) to move synchronously along the radial direction of the inner ring positioning block (8). The third positioning ring drive mechanism is connected to all the outer ring positioning blocks and can drive all the outer ring positioning blocks to move synchronously along the radial direction of the inner ring positioning block (8). The outer ring positioning block is provided with a pouring port (10), and the pouring port (10) is connected to the annular gap between the outer ring positioning block (6) and the inner ring positioning block (8).

2. The diffuser casting mold according to claim 1, characterized in that, The upper cover plate (1) is also provided with an outer ring positioning block pressure plate (2) that is adapted to the outer edge contour of the outer ring positioning block (6). The outer ring positioning block pressure plate (2) is used to limit the outer ring positioning block (6). The upper cover plate (1) is also provided with an inner ring positioning block pressure plate (3) that is adapted to the inner edge contour of the inner ring positioning block (8). The inner ring positioning block pressure plate (3) is used to limit the inner ring positioning block (8).

3. A diffuser casting mold according to claim 1, characterized in that, The mounting base is equipped with a first sliding tenon (11), and the sliding direction of the first sliding tenon (11) is along the radial direction of the inner ring positioning block (8); The first inner ring positioning block (8-1) is connected to the first sliding tenon (11); The first positioning ring drive mechanism includes a turntable (18) and a first connecting rod (17). The two ends of the first connecting rod (17) are respectively hinged to the first sliding tenon (11) and the turntable (18). The turntable (18) is mounted on the mounting base, and the rotation axis of the turntable (18) is coaxial with the axis of the inner ring positioning block (8).

4. A diffuser casting mold according to claim 1, characterized in that, The mounting base is equipped with a second sliding tenon (13) and a third sliding tenon (15). The sliding direction of the second sliding tenon (13) and the third sliding tenon (15) is along the radial direction of the inner ring positioning block (8). The second inner ring positioning block (8-2) is connected to the second sliding tenon (13), and the outer ring positioning block is connected to the third sliding tenon (15). The second positioning ring drive mechanism and the third positioning ring drive mechanism adopt the same drive structure, which includes a flower plate (20) and a flower plate drive mechanism. The flower plate (20) is rotatably connected to the mounting base. The rotating shaft of the flower plate (20) is coaxial with the axis of the inner ring positioning block (8). The flower plate drive mechanism is connected to the flower plate (20). The flower plate drive mechanism is used to drive the flower plate (20) to rotate. Each of the second sliding tenons (13) and the third sliding tenons (15) is connected to a sliding rod (21) perpendicular to the flower plate (20). The flower plate (20) has a sliding hole (20-1) for the sliding rod (21) to pass through and cooperate with the sliding rod. The sliding hole (20-1) is an arc-shaped elongated hole. When the flower plate (20) rotates, the flower plate (20) can drive the slide rod (21), the second slide tenon (13) and the third slide tenon (15) to move simultaneously, so that all outer ring positioning blocks move radially outward synchronously and all second inner ring positioning blocks (8-2) move radially inward synchronously; or when the flower plate (20) rotates, the flower plate (20) can drive the slide rod (21), the second slide tenon (13) and the third slide tenon (15) to move simultaneously, so that all outer ring positioning blocks move radially inward synchronously and all second inner ring positioning blocks (8-2) move radially outward synchronously.

5. A diffuser casting mold according to claim 4, characterized in that, A sliding bearing that mates with the sliding hole (20-1) is fitted on the slide rod (21), and the sliding bearing and the sliding hole (20-1) are in clearance fit.

6. A diffuser casting mold according to claim 4, characterized in that, The flower disc drive mechanism includes an arc-shaped rack (38) disposed on the outer edge of the flower disc (20), a gear (39) and a gear drive mechanism. The gear (39) meshes with the arc-shaped rack (38), and the gear drive mechanism is connected to the gear (39).

7. A diffuser casting mold according to claim 6, characterized in that, The gear drive mechanism includes a rack (40) and a cylinder. The rack (40) is slidably connected to the mounting base. The push rod of the cylinder is connected to one end of the rack (40) through a connecting shaft (41). The connecting shaft (41), the rack (40), and the push rod of the cylinder are all shaft-connected. The cylinder can drive the rack (40) to reciprocate. The gear (39) is rotatably connected to the mounting base. The gear (39) is externally meshed with the rack (40) and the arc-shaped rack (38).

8. A diffuser casting mold according to claim 6, characterized in that, The ejector mechanism includes an ejector plate (45), an ejector plate drive mechanism, an outer ring ejector block (23), and an inner ring ejector block (24). The outer ring ejector block (23) and the inner ring ejector block (24) are both fixed on the ejector plate (45). The outer ring ejector block (23) is used to eject the outer edge of the casting during ejection, and the inner ring ejector block (24) is used to eject the inner edge of the casting during ejection. Several outer ring ejector blocks (23) and inner ring ejector blocks (24) are evenly arranged on the ejector plate (45) along the circumferential direction. The ejector plate (45) is located below the flower plate (20). The outer ring top block (23) and the inner ring top block (24) both penetrate the flower plate (20). The flower plate (20) has a through hole for the outer ring top block (23) and the inner ring top block (24) to pass through. The through hole is an arc-shaped long hole coaxial with the flower plate. The ejector plate drive mechanism is connected to the ejector plate (45), and the ejector plate drive mechanism can drive the ejector plate (45) to move along the axial direction of the flower plate (20).

9. A diffuser casting mold according to claim 8, characterized in that, The ejector plate (45) is provided with a number of guide blocks (25) evenly in the circumferential direction. The flower plate (20) is provided with a through hole for the guide blocks (25) to pass through. The through hole is an arc-shaped long hole coaxial with the flower plate. The guide block (25) and the through hole are in clearance fit. The ejector plate drive mechanism is a cylinder. The bottom of the ejector plate (45) is evenly connected with a number of cylinders in the circumferential direction. The push rod of the cylinder is connected to the ejector plate (45).

10. A method for operating a diffuser casting mold according to any one of claims 1-9, characterized in that, The process includes the following: Mold opening process: Remove the upper cover plate (1), drive all the first inner ring positioning blocks (8-1) to move synchronously towards the center of the inner ring positioning block (8) through the first positioning ring driving mechanism, drive all the second inner ring positioning blocks (8-2) to move synchronously towards the center of the inner ring positioning block (8) through the second positioning ring driving mechanism, drive all the outer ring positioning blocks to move away from the center of the inner ring positioning block (8) through the third positioning ring driving mechanism, and the first inner ring positioning block (8-1), the second inner ring positioning block (8-2) and the outer ring positioning blocks all reach the set position, the mold is fully opened, the wax model is ejected through the ejector mechanism, the mold opening process is completed, and the wax model is taken out. Mold closing process: The ejector mechanism returns to its original position before ejection. The first positioning ring drive mechanism drives all the first inner ring positioning blocks (8-1) to move synchronously away from the center of the inner ring positioning block (8) and reach the stop position. Then, the second positioning ring drive mechanism drives all the second inner ring positioning blocks (8-2) to move synchronously away from the center of the inner ring positioning block (8) and reach the stop position. At this time, all the first inner ring positioning blocks (8-1) and the second inner ring positioning blocks (8-2) are assembled into the inner ring positioning block (8). The third positioning ring drive mechanism drives all the outer ring positioning blocks to move towards the center of the inner ring positioning block (8) and reach the stop position. All the outer ring positioning blocks are assembled into the outer ring positioning block (6). The upper cover plate (1) is placed over the upper part of the outer ring positioning block (6) and the inner ring positioning block (8), so that the leaf-shaped pressure plate (5) seals the top of the ring gap between the outer ring positioning block (6) and the inner ring positioning block (8), thus completing the mold closing process. The pouring and cooling process: After the mold closing process is completed, wax liquid is injected into the cavity formed by the outer ring positioning block (6), the inner ring positioning block (8), the blade pressure plate (5) and the blade module positioning base (7) through the pouring port (10). After the wax liquid solidifies, the mold opening process is carried out.

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