Spiral synchronous driving mechanism of impeller sand core and core making mold

Abstract

The application discloses a spiral synchronous driving mechanism of a vane core sand core and a core making mold, and belongs to the technical field of mold core pulling. The spiral synchronous driving mechanism of the vane core sand core comprises a guide module, a core pulling module and a driving module. The guide module comprises a first guide unit and a second guide unit sleeved outside the first guide unit. The first guide unit is connected to a mold block and is configured to guide the second guide unit to spiral lift along the first guide unit. The core pulling module comprises a plurality of blade cores capable of being arranged in a core pulling groove. The plurality of blade cores are arranged in the circumferential direction of the second guide unit and move synchronously with the second guide unit. The output end of the driving module is in transmission connection with the second guide unit. The driving module drives the second guide unit to spiral lift along the first guide unit, so as to drive the blade cores to extend into or out of the core pulling groove. The spiral lifting of the second guide unit drives the blade cores to separate from the mold block, so as to facilitate core pulling of a workpiece.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mold core-pulling, in particular to a spiral synchronous driving mechanism for impeller sand core and a core-making mold. BACKGROUND

[0002] As a key part of a pump, an impeller is usually formed by casting. Since the blades are twisted and have three directions of displacement in the demolding direction and are evenly distributed along the shaft, it is very difficult to separate the blade inserts in the mold block from the sand core when the impeller sand core is made.

[0003] In order to solve the demolding problem of the sand core blade part, the prior art mainly uses split core assembly to make the impeller sand core. However, since the split core assembly has multiple sand core assembly joint positions, flash is formed on the surface of the casting, which is difficult to clean and affects the dynamic balance of the casting. If manual core assembly is performed, the labor cost is increased.

[0004] Therefore, it is necessary to propose a core-pulling structure to solve the problem of flash on the surface of the impeller caused by split core assembly, so as to improve the core-making quality and automation. SUMMARY

[0005] The purpose of the present application is to provide a spiral synchronous driving mechanism for impeller sand core and a core-making mold to solve the problem of flash on the surface of the impeller caused by split core assembly.

[0006] As conceived above, the technical solution adopted by the present application is:

[0007] The spiral synchronous driving mechanism for impeller sand core is used for core-pulling of a workpiece in a mold cavity of a mold block. The mold block is provided with a plurality of core-pulling grooves, and comprises:

[0008] A guide module comprises a first guide unit and a second guide unit sleeved outside the first guide unit. The first guide unit is connected to the mold block and is configured to guide the second guide unit to spiral up and down along the first guide unit.

[0009] A core-pulling module comprises a plurality of blade cores that can be inserted into the core-pulling grooves. The plurality of blade cores are arranged in the circumferential direction of the second guide unit and move synchronously with the second guide unit.

[0010] A driving module is transmissionally connected to the output end of the second guide unit. The driving module drives the second guide unit to spiral up and down along the first guide unit, so as to drive the blade cores to extend into or out of the core-pulling grooves.

[0011] The spiral synchronous driving mechanism of the impeller sand core connects the output end of the driving module with the second guide unit in transmission, so that the driving module can drive the second guide unit to move. At the same time, the first guide unit can guide the second guide unit to spiral up and down, so as to drive the core-pulling module to spiral up and down synchronously, and then the core-pulling blades on the core-pulling module can be pulled into or out of the core-pulling groove, so as to core-pull the workpiece. In addition, compared with the conventional manual single plugging and pulling of the core-pulling blades, the spiral synchronous driving mechanism of the impeller sand core effectively improves the production efficiency, reduces the labor intensity, avoids the risk of scratching the workpiece caused by manual plugging and pulling of the core-pulling blades, and effectively improves the quality of the workpiece.

[0012] As a preferred scheme of the spiral synchronous driving mechanism of the impeller sand core, the first guide unit comprises:

[0013] A guide rod connected to the mold block, the guide rod extending in the vertical direction;

[0014] A plurality of guide portions are arranged on the circumference of the guide rod, the guide portions being arranged spirally along the extension direction of the guide rod, and the guide portions being used for guiding the second guide unit to spiral up and down along the extension direction of the guide rod.

[0015] The guide portions are arranged spirally along the extension direction of the guide rod, so that the second guide unit matched with the guide portions can spiral up and down along the extension direction of the guide portions under the driving of the driving unit, thereby driving the core-pulling blades to core-pull the workpiece.

[0016] As a preferred scheme of the spiral synchronous driving mechanism of the impeller sand core, the first guide unit further comprises a connecting portion arranged at one end of the guide rod, the guide rod being connected with the mold block through the connecting portion, one side of the connecting portion not connected with the guide rod being provided with a protruding structure, the mold block being provided with a groove, and the protruding structure being inserted and matched with the groove.

[0017] The protruding structure of the connecting portion is inserted and matched with the groove on the mold block to strengthen the connection strength of the mold block and the guide rod, so as to prevent the guide rod from moving together with the second guide unit due to loose connection when the spiral synchronous driving mechanism of the impeller sand core is core-pulling.

[0018] As a preferred scheme of the spiral synchronous driving mechanism of the impeller sand core, the distance of the guide portions around the guide rod in the axial direction of the guide rod is not less than the stroke of the core-pulling blades.

[0019] The distance of the guide portions around the guide rod in the axial direction of the guide rod is not less than the stroke of the core-pulling blades, so as to maximize the efficiency of the guide portions arranged on the guide rod on the basis of ensuring that the guide rod and the second guide unit are connected and fastened through the guide portions, thereby ensuring the core-pulling quality.

[0020] As a preferred solution of the spiral synchronous driving mechanism of the impeller sand core, the second guide unit comprises:

[0021] A guide assembly is internally provided with a guide groove for cooperating with the guide part, and the output end of the driving module is in transmission connection with the guide assembly.

[0022] A core-pulling bottom plate is sleeved on the outside of the guide assembly, and a plurality of blade cores are circumferentially arranged on the core-pulling bottom plate; the driving module drives the guide assembly to move along the extension direction of the guide part, so as to drive the blade cores to extend into or out of the core-pulling groove.

[0023] A plurality of blade cores are arranged on the core-pulling bottom plate in the circumferential direction, and the core-pulling bottom plate is sleeved on the outside of the guide assembly, so that the core-pulling bottom plate can drive the plurality of blade cores to extend into or out of the core-pulling groove under the guidance of the guide assembly, thereby completing the core-pulling operation.

[0024] As a preferred solution of the spiral synchronous driving mechanism of the impeller sand core, the guide assembly comprises:

[0025] A guide sleeve is internally provided with the guide groove, and the outer circumferential surface of the guide sleeve is provided with a plurality of clamping grooves.

[0026] A fixing part is sleeved on the outside of the guide sleeve, and the core-pulling bottom plate is sleeved on the outside of the fixing part.

[0027] A plurality of transmission parts are circumferentially arranged on the fixing part and correspondingly arranged in the clamping grooves, and the transmission parts are clamped in the corresponding clamping grooves.

[0028] The guide groove in the guide sleeve cooperates with the guide part, so that the guide sleeve can be spirally lifted along the guide part, and the core-pulling bottom plate is sleeved on the outside of the fixing part, so that the transmission connection between the guide part and the fixing part is realized, thereby transmitting the torque from the driving module to the fixing part, and further avoiding the slip between the fixing part and the guide sleeve.

[0029] As a preferred solution of the spiral synchronous driving mechanism of the impeller sand core, a plurality of through holes are arranged through the thickness of the blade core.

[0030] A plurality of through holes are arranged in the thickness direction of the blade core to reduce the cost.

[0031] As a preferred scheme of the impeller core spiral synchronous driving mechanism, the impeller core spiral synchronous driving mechanism further comprises a bearing assembly, the output end of the driving module is connected with the second guide unit through the bearing assembly, and the output end of the driving module is relatively rotatable with the second guide unit through the bearing assembly.

[0032] The bearing assembly is used to connect the driving module and the guide module, so as to reduce the friction of the equipment during transmission, thereby improving the transmission effect.

[0033] As a preferred scheme of the impeller core spiral synchronous driving mechanism, the bearing assembly comprises:

[0034] A transmission shaft is connected to the output end of the driving module.

[0035] A bearing set is sleeved outside the transmission shaft.

[0036] A shaft sleeve structure is sleeved outside the bearing set and can rotate around the transmission shaft, and the shaft sleeve structure is connected with the second guide unit.

[0037] The bearing set has the advantages of small friction resistance and high transmission precision, and can ensure the transmission efficiency of the driving module, and the shaft sleeve structure is sleeved outside the bearing set, and the bearing set is sleeved outside the transmission shaft, so that the maintenance of the bearing assembly as a whole is more convenient.

[0038] The core making mold comprises the mold block, the core lifting mechanism, and the impeller core spiral synchronous driving mechanism, the impeller core spiral synchronous driving mechanism is located below the mold block, the first guide unit of the impeller core spiral synchronous driving mechanism is connected with the mold block, and the core lifting mechanism is installed in the installation groove of the mold cavity and used for lifting the workpiece out of the mold cavity after core pulling.

[0039] The core lifting mechanism is arranged in the mold cavity and the installation groove for installing the core lifting mechanism is arranged, so that the workpiece is lifted out of the mold for demolding after core pulling is completed, and manufacturing automation is realized.

[0040] The beneficial effects of the present application are as follows:

[0041] The spiral synchronous driving mechanism of the impeller sand core disclosed by the application connects the output end of the driving module with the second guiding unit in transmission, so that the driving module can drive the second guiding unit to move, and the first guiding unit can guide the second guiding unit to spiral lift, so as to drive the core pulling module to spiral lift synchronously, and then the core pulling blades on the core pulling module can be pulled into or pulled out of the core pulling groove, so as to pull the workpiece, in addition, compared with the conventional manual single plugging and pulling blade core pulling mode, the spiral synchronous driving mechanism of the impeller sand core can effectively improve the production efficiency, reduce the labor intensity, avoid the risk of scratching the workpiece caused by manual plugging and pulling blade core pulling, and effectively improve the quality of the workpiece.

[0042] The core making mold disclosed by the application sets the core lifting mechanism in the cavity and sets the installation groove for installing the core lifting mechanism, so that the workpiece can be lifted out of the mold by the core lifting mechanism after the core pulling is completed, so as to realize automation. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 is the structure schematic view of the spiral synchronous driving mechanism of the impeller sand core and the lower mold block provided by the application;

[0044] Figure 2 is the sectional view of the spiral synchronous driving mechanism of the impeller sand core provided by the application;

[0045] Figure 3 is the structure schematic view of the guide rod provided by the application;

[0046] Figure 4 is the bottom view of the guiding assembly provided by the application;

[0047] Figure 5 is the structure schematic view of the blade core pulling provided by the application.

[0048] In the drawings:

[0049] 1, guiding module; 11, first guiding unit; 111, guide rod; 112, guiding part; 113, connecting part; 12, second guiding unit; 121, guiding assembly; 1211, guide sleeve; 1212, fixed part; 1213, transmission part; 122, core pulling bottom plate;

[0050] 2, core pulling module; 21, blade core pulling;

[0051] 3, driving module;

[0052] 4, bearing assembly; 41, transmission shaft; 42, bearing group; 421, ball bearing; 43, shaft sleeve structure;

[0053] 5, mold block; 52, installation groove. DETAILED DESCRIPTION

[0054] Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein the same or like component have the same or similar designations. The embodiments described below are presented by way of example to explain the present application and are not intended to limit the present application.

[0055] In the description of the present application, unless otherwise clearly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrated; can be mechanically connected, can be electrically connected; can be directly connected, can be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0056] In the present application, unless otherwise clearly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0057] The technical solutions of the present application are further illustrated below in conjunction with the drawings and through specific embodiments.

[0058] The present application provides a core making mold, such as Figure 1 As shown, the core making mold includes a mold block 5 and a core ejection mechanism, which is installed in a mounting groove 52 of the mold cavity of the mold block 5, and is used to eject the injection molded workpiece from the mold cavity.

[0059] In the prior art, the impeller sand core is generally made by the methods of split core assembly, wax molding core and loose block, but there are many defects. Specifically, the split core assembly divides the entire impeller sand core into multiple sand cores for facilitating the demolding of the blades, and then combines the multiple sand cores into a complete impeller core. However, the combined joint position of the multiple sand cores will form a flash on the casting, which is difficult to clean and affects the dynamic balance of the casting. Moreover, the multiple sand cores need to be manually assembled after demolding, which increases the labor cost. The wax molding core is made of paraffin wax for the blade inserts on the mold block. Before the core making, the single blade-shaped paraffin wax insert is manually installed on the mold block. After the core making, the paraffin wax insert is integrated with the sand core. The paraffin wax insert is melted by heating to form the required sand core shape. Since the paraffin wax insert needs to be manually placed before the core making, the production efficiency is low. After the core making, the paraffin wax needs to be heated and melted, which increases the production cost. The loose block method is to design the mold block blades into loose block form. When the sand core is taken out, each mold block blade is taken out from the sand core. Since the blade loose block needs to be manually placed before the core making and manually taken out from the sand core after the core making, the production efficiency is low. Moreover, the manual taking of the loose block is easy to scratch the sand core, and the stability of the sand core is poor.

[0060] To solve the above problems, the core making mold further comprises a spiral synchronous driving mechanism of the impeller sand core. The spiral synchronous driving mechanism of the impeller sand core is located below the mold block 5. The mold block 5 is connected with the spiral synchronous driving mechanism of the impeller sand core. The core lifting mechanism is used to lift the workpiece out of the mold cavity after the core pulling. The mold block 5 comprises an upper mold block and a lower mold block. In this embodiment, the spiral synchronous driving mechanism of the impeller sand core is connected with the lower mold block. In other embodiments, the spiral synchronous driving mechanism of the impeller sand core is connected with the upper mold block, which is not limited here.

[0061] As Figure 2As shown, the mold block 5 is provided with a plurality of core-pulling grooves, and the spiral synchronous driving mechanism of the impeller sand core comprises a guide module 1, a core-pulling module 2 and a driving module 3. The guide module 1 comprises a first guide unit 11 and a second guide unit 12 sleeved outside the first guide unit 11, and the first guide unit 11 is connected to the mold block 5 and is configured to guide the second guide unit 12 to spiral up and down along the first guide unit 11. The core-pulling module 2 comprises a plurality of blade cores 21 capable of being arranged in the core-pulling grooves, and the plurality of blade cores 21 are arranged in the circumferential direction of the second guide unit 12 and move synchronously with the second guide unit 12. The output end of the driving module 3 is in transmission connection with the second guide unit 12, and the driving module 3 drives the second guide unit 12 to spiral up and down along the first guide unit 11 to drive the blade core 21 to extend into or out of the core-pulling groove. The output end of the driving module 3 is in transmission connection with the second guide unit 12, so that the driving module 3 can drive the second guide unit 12 to move. At the same time, the first guide unit 11 can guide the second guide unit 12 to spiral up and down to drive the core-pulling module 2 to spiral up and down synchronously, so that the plurality of blade cores 21 on the core-pulling module 2 extend into or out of the core-pulling groove, thereby facilitating the core-pulling of the workpiece. In addition, compared with the conventional manual single plugging blade core-pulling mode, the spiral synchronous driving mechanism of the impeller sand core effectively improves the production efficiency, reduces the labor intensity, avoids the risk of scratching the workpiece caused by manual plugging of the blade core-pulling, and effectively improves the quality of the workpiece.

[0062] Further, as shown in the drawings, Figure 3 The first guide unit 11 comprises a guide rod 111 and a guide portion 112. The guide rod 111 is connected to the mold block 5 and extends in the vertical direction. The guide portion 112 is arranged in the circumferential direction of the guide rod 111 and is spirally arranged along the extension direction of the guide rod 111. The guide portion 112 is used to guide the second guide unit 12 to spiral up and down along the extension direction of the guide rod 111. The guide portion 112 is spirally arranged along the extension direction of the guide rod 111, so that the second guide unit 12 cooperating with the guide portion 112 can spiral up and down along the extension direction of the guide portion 112 under the driving of the driving unit, thereby driving the blade core 21 to core-pull the workpiece.

[0063] Preferably, the guide portion 112 is arranged as a plurality of guide portions 112, and the plurality of guide portions 112 are spirally arranged along the extension direction of the guide rod 111. The above structure improves the stability of the spiral up of the guide rod 111, thereby ensuring the core-pulling quality.

[0064] Specifically, the first guide unit 11 further comprises a connecting portion 113, which is arranged at one end of the guide rod 111 and connected with the block 5 through the connecting portion 113. The connecting portion 113 is fixedly connected with the block 5 through a fixing member. One side of the connecting portion 113, which is not connected with the guide rod 111, is provided with a protruding structure. The block 5 is provided with a groove, and the protruding structure and the groove are inserted and matched. The protruding structure of the connecting portion 113 and the groove on the block 5 are inserted and matched to facilitate positioning of the first guide unit 11, and the connecting strength of the block 5 and the guide rod 111 is also enhanced to prevent the guide rod 111 from moving with the second guide unit 12 due to loose connection when the helical synchronous driving mechanism of the impeller core is performing core pulling.

[0065] Further, the distance of the guide portion 112 along the axial direction of the guide rod 111 around the guide rod 111 for one turn is not less than the stroke of the blade core 21. The distance of the guide portion 112 along the axial direction of the guide rod 111 around the guide rod 111 for one turn is not less than the stroke of the blade core 21, which maximizes the efficiency of the guide portion 112 arranged on the guide rod 111 on the basis of ensuring that the guide rod 111 and the second guide unit 12 are connected and fastened through the guide portion 112, thereby ensuring the core pulling quality.

[0066] Further, as shown in Figure 2 and Figure 3 , the second guide unit 12 comprises a guide assembly 121 and a core pulling bottom plate 122. The guide assembly 121 is internally provided with a guide groove for cooperation with the guide portion 112, and the output end of the driving module 3 is in transmission connection with the guide assembly 121. The core pulling bottom plate 122 is sleeved on the outside of the guide assembly 121, and a plurality of blade cores 21 are arranged and installed in the circumferential direction of the core pulling bottom plate 122. The driving module 3 drives the guide assembly 121 to move along the extension direction of the guide portion 112 to drive the blade core 21 to extend into or out of the core pulling groove. The plurality of blade cores 21 are arranged and installed in the circumferential direction of the core pulling bottom plate 122, and the core pulling bottom plate 122 is sleeved on the outside of the guide assembly 121, so that the core pulling bottom plate 122 can drive the plurality of blade cores 21 thereon to extend into or out of the core pulling groove under the guidance of the guide assembly 121, thereby completing the core pulling operation.

[0067] As shown in Figure 4As shown, the guide assembly 121 comprises a guide sleeve 1211, a fixed part 1212 and a plurality of transmission parts 1213, wherein the inside of the guide sleeve 1211 is provided with a guide groove, and the outer circumferential surface of the guide sleeve 1211 is provided with a plurality of clamping grooves; the fixed part 1212 is sleeved on the outside of the guide sleeve 1211, and the core-pulling bottom plate 122 is sleeved on the outside of the fixed part 1212; the plurality of transmission parts 1213 are installed on the circumference of the fixed part 1212 and are arranged one by one corresponding to the clamping grooves, and the transmission parts 1213 are clamped in the corresponding clamping grooves. By cooperating the guide groove in the inside of the guide sleeve 1211 with the guide part 112, the guide sleeve 1211 can be lifted and lowered along the guide part 112, and the core-pulling bottom plate 122 is sleeved on the outside of the fixed part 1212, so that the transmission connection of the guide sleeve 1211 and the fixed part 1212 is realized by the guide part 112, thereby transmitting the torque from the driving module 3 to the fixed part 1212, and further avoiding the slippage of the fixed part 1212 and the guide sleeve 1211.

[0068] Further, as shown in the drawings, Figure 5 The blade core 21 is provided with a plurality of through holes penetrating through its thickness. The plurality of through holes are arranged in the thickness direction of the blade to reduce the cost.

[0069] Preferably, the blade core 21 is floatingly connected to the core-pulling bottom plate 122, and when it is necessary to adjust the core-pulling position of the workpiece, only the position of the blade core 21 on the core-pulling bottom plate 122 needs to be finely adjusted, so that the above structure can make the preparation types of the spiral synchronous driving mechanism of the impeller sand core more diversified.

[0070] As shown in the drawings, Figure 2 The spiral synchronous driving mechanism of the impeller sand core further comprises a bearing assembly 4, the output end of the driving module 3 is connected to the second guide unit 12 through the bearing assembly 4, and the output end of the driving module 3 rotates relative to the second guide unit 12 through the bearing assembly 4. The bearing assembly 4 is used to connect the driving module 3 and the guide module 1 to reduce the friction force in the transmission process of the equipment, thereby improving the transmission effect.

[0071] Specifically, the bearing assembly 4 comprises a transmission shaft 41, a bearing set 42 and a shaft sleeve structure 43, wherein the transmission shaft 41 is connected to the output end of the driving module 3; the bearing set 42 is sleeved on the outside of the transmission shaft 41; the shaft sleeve structure 43 is sleeved on the outside of the bearing set 42 and can rotate around the transmission shaft 41, and the shaft sleeve structure 43 is connected to the second guide unit 12. The bearing set 42 has the advantages of small friction resistance and high transmission precision, and can ensure the transmission efficiency of the driving module 3. At the same time, the structure that the shaft sleeve structure 43 is sleeved on the bearing set 42 and the bearing set 42 is sleeved on the transmission shaft 41 makes the overall maintenance of the bearing assembly 4 more convenient.

[0072] Preferably, the bearing assembly 42 comprises ball bearings 421 arranged at both ends of the transmission shaft 41, and the ball bearings 421 have small starting friction and can bear combined radial and axial loads, and are not sensitive to interruption of lubrication, and thus can be well applied to the injection molding field and core-pulling operation. Since the thrust ball bearings have good centricity (centricity refers to the degree of deviation of the bearing balls under a bearing load), and the paired thrust ball bearings can well bear axial loads, in the embodiment, the ball bearings 421 are configured as thrust ball bearings.

[0073] The steps of using the helical synchronous driving mechanism of the impeller sand core are as follows:

[0074] After the workpiece is injection molded, the cavity of the mold block 5 comprises the injection-molded workpiece and the plurality of blade cores 21, and the blade cores 21 extend into the workpiece through the core-pulling grooves;

[0075] Then, the driving module 3 retracts the output end thereof, and drives the bearing assembly 4 connected thereto to descend, the bearing assembly 4 drives the second guide unit 12 connected thereto to descend, the second guide unit 12 drives the core-pulling module 2 to helically descend under the guidance of the first guide unit 11, so that the blade cores 21 on the core-pulling module 2 are pulled out of the core-pulling grooves;

[0076] Then, the core-pulling mechanism is started, the workpiece in the cavity is taken out, and is sent to the next process flow;

[0077] Then, the driving module 3 extends the output end thereof, and drives the bearing assembly 4 connected thereto to ascend, the bearing assembly 4 drives the second guide unit 12 connected thereto to ascend, the second guide unit 12 drives the core-pulling module 2 to helically ascend under the guidance of the first guide unit 11, so that the blade cores 21 on the core-pulling module 2 extend into the core-pulling grooves to prepare for the injection molding of the next workpiece.

[0078] The above embodiments only illustrate the basic principles and characteristics of the present application, and the present application is not limited to the above embodiments. Without departing from the spirit and scope of the present application, various changes and modifications can be made to the present application, and these changes and modifications all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A spiral synchronous drive mechanism for impeller sand cores, used for core pulling of workpieces within the cavity of a mold block (5), wherein the mold block (5) is provided with a plurality of core pulling slots, characterized in that, include: The guide module (1) includes a first guide unit (11) and a second guide unit (12) sleeved on the outside of the first guide unit (11). The first guide unit (11) is connected to the block (5). The first guide unit (11) is configured to guide the second guide unit (12) to spiral up and down along the first guide unit (11). The core-pulling module (2) includes a plurality of blade core-pulling (21) that can pass through the core-pulling slot. The plurality of blade core-pulling (21) are arranged in the circumferential direction of the second guide unit (12) and move synchronously with the second guide unit (12). The drive module (3) is connected to the second guide unit (12) via a transmission. The drive module (3) drives the second guide unit (12) to spiral up and down along the first guide unit (11) so as to drive the blade core puller (21) to extend into or out of the core puller slot. The first guiding unit (11) includes: Guide rod (111), the guide rod (111) is connected to the block (5), and the guide rod (111) extends in the vertical direction; A guide portion (112), a plurality of the guide portions (112) are disposed around the guide rod (111), the guide portions (112) are spirally disposed along the extension direction of the guide rod (111), and the guide portions (112) are used to guide the second guide unit (12) to spirally rise and fall along the extension direction of the guide rod (111); The second guide unit (12) includes: The guide assembly (121) has a guide groove inside, which is used to cooperate with the guide part (112). The output end of the drive module (3) is connected to the guide assembly (121) in a transmission manner. A core-pulling base plate (122) is sleeved on the outside of the guide assembly (121), and a plurality of blade core pullers (21) are arranged circumferentially on the core-pulling base plate (122); the drive module (3) drives the guide assembly (121) to move along the extension direction of the guide part (112) so as to drive the blade core pullers (21) to extend into or out of the core-pulling groove.

2. The helical synchronous drive mechanism for the impeller sand core according to claim 1, characterized in that, The first guide unit (11) further includes a connecting part (113), which is disposed at one end of the guide rod (111). The guide rod (111) is connected to the block (5) through the connecting part (113). The side of the connecting part (113) that is not connected to the guide rod (111) is provided with a protruding structure. The block (5) is provided with a groove, and the protruding structure is inserted into the groove.

3. The helical synchronous drive mechanism for the impeller sand core according to claim 1, characterized in that, The distance of the guide part (112) around the guide rod (111) in the axial direction is not less than the stroke of the blade core pulling (21).

4. The helical synchronous drive mechanism for the impeller sand core according to claim 1, characterized in that, The guide component (121) includes: Guide sleeve (1211), the guide sleeve (1211) is provided with the guide groove inside, and the guide sleeve (1211) is provided with several slots on its outer peripheral surface; The fixing part (1212) is sleeved on the outside of the guide sleeve (1211), and the core-pulling bottom plate (122) is sleeved on the outside of the fixing part (1212); A plurality of transmission parts (1213) are installed around the fixed part (1212) and are provided in a corresponding manner with the slots. The transmission parts (1213) are engaged in the corresponding slots.

5. The helical synchronous drive mechanism for the impeller sand core according to claim 1, characterized in that, The blade core extractor (21) is provided with several through holes that extend through its thickness.

6. The helical synchronous drive mechanism for the impeller sand core according to any one of claims 1-5, characterized in that, The spiral synchronous drive mechanism of the impeller sand core also includes a bearing assembly (4). The output end of the drive module (3) is connected to the second guide unit (12) through the bearing assembly (4). The output end of the drive module (3) rotates relative to the second guide unit (12) through the bearing assembly (4).

7. The helical synchronous drive mechanism for the impeller sand core according to claim 6, characterized in that, The bearing assembly (4) includes: The drive shaft (41) is connected to the output end of the drive module (3); Bearing assembly (42), the bearing assembly (42) is sleeved on the outside of the drive shaft (41); A bushing structure (43) is sleeved on the outside of the bearing assembly (42) and can rotate around the transmission shaft (41). The bushing structure (43) is connected to the second guide unit (12).

8. A core-making mold, comprising a mold block (5), a core-ejecting mechanism, and a spiral synchronous drive mechanism for an impeller core as described in any one of claims 1-7, wherein the spiral synchronous drive mechanism for the impeller core is located below the mold block (5), the first guide unit (11) of the spiral synchronous drive mechanism for the impeller core is connected to the mold block (5), and the core-ejecting mechanism is installed in the mounting groove (52) of the cavity for ejecting the workpiece after core extraction from the cavity.

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