Coring unit suitable for production of small batches of multi-variety sand cores

Abstract

Disclosed in the present invention is a coring unit suitable for the production of small batches of multi-variety sand cores, which coring unit cooperates with a core box device. The core box device comprises a sleeve frame, an upper mold movably arranged on the sleeve frame, a lower mold fixed in the sleeve frame, a plurality of side molds movably arranged in the circumferential direction of the lower mold, and a lower core jacking mechanism mounted on the sleeve frame. A sand core is formed in a cavity formed by the upper mold, the lower mold and the plurality of side molds. The lower core jacking mechanism extends into the cavity. The coring unit comprises: a coring device, which is configured to lock the core box device and comprises a frame, a core box locking mechanism arranged on the frame and configured to lock the core box device, and an ejection mechanism mounted on the frame and configured to eject the sleeve framework and the sand core; and a fixture device, which is configured to clamp the upper mold, the sleeve frame and the sand core, and comprises a mounting base, a coring fork assembly arranged on the mounting base and configured to clamp the sand core, and a clamping shaft mechanism configured to clamp the upper mold and the sleeve frame. The coring unit suitable for the production of small batches of multi-variety sand cores provided in the present invention can improve production efficiency and reduce energy consumption.

Description

Core taking unit suitable for small-batch and multi-variety sand core production TECHNICAL FIELD

[0001] The present application relates to the technical field of casting, in particular to a core taking unit suitable for small-batch and multi-variety sand core production. BACKGROUND

[0002] In today's increasingly competitive casting product market, new product development can effectively improve market competitiveness, customer satisfaction, reduce costs, improve efficiency and enhance enterprise innovation capabilities, etc.

[0003] Generally, when developing new products, multiple types of sand cores are needed, but the batch size is small. Under the premise of ensuring quality, the production cycle is required to be short, and the cost is also considered.

[0004] For the production of such small-batch and multi-variety sand cores, a general core box plus manual core taking method is generally used. However, this method has high labor intensity and it is difficult to take complex sand cores.

[0005] When using mechanical core taking, the upper mold is on the top and the sleeve frame is on the bottom. When taking the core, the lifting mechanism lifts the upper mold to open the mold while taking the core, and then the lower core ejection mechanism is used to eject the sand core from the mold. The processes of upper and lower core taking respectively need corresponding driving force, which is complex in structure and high in energy consumption. SUMMARY

[0006] Based on the above problems, the purpose of the present application is to provide a core taking unit suitable for small-batch and multi-variety sand core production, which can reduce labor intensity and improve production efficiency.

[0007] In order to overcome the shortcomings of the prior art, the technical scheme provided by the present application is as follows:

[0008] A core taking unit suitable for small-batch and multi-variety sand core production, which cooperates with a core box device, the core box device comprising a sleeve frame, an upper mold movably arranged on the sleeve frame, a lower mold fixed in the sleeve frame, a plurality of side molds movably arranged on the circumference of the lower mold, and a lower core ejection mechanism installed on the sleeve frame, a sand core being formed in a cavity formed by the upper mold, the lower mold and the plurality of side molds, the lower core ejection mechanism extending into the cavity, the core taking unit comprising:

[0009] A core taking device for locking the core box device, comprising a rack, a core box locking mechanism arranged on the rack for locking the core box device, and an ejection mechanism installed on the rack for ejecting the sleeve frame and the sand core;

[0010] A clamp device for clamping the upper mold, the sleeve frame and the sand core, comprising a mounting base, a core taking fork assembly arranged on the mounting base for clamping the sand core, and a clamping shaft mechanism for clamping the upper mold and the sleeve frame.

[0011] In one of the embodiments, the frame comprises a base and a support table arranged on the base, and the core box device is arranged on the support table.

[0012] In one of the embodiments, the ejection mechanism comprises a top plate, a first ejection rod assembly arranged on the upper end of the top plate for ejecting the frame, a second ejection rod assembly arranged on the top plate for ejecting the core, a first driving component for driving the top plate to move up and down, and a guide rod assembly arranged on the lower end of the top plate.

[0013] The second ejection rod assembly comprises a plurality of second ejection rods arranged on the middle part of the top plate, and the first ejection rod assembly comprises a plurality of first ejection rods arranged on the outer periphery of the second ejection rod assembly, the height of the first ejection rod is greater than that of the second ejection rod, and the upper die is provided with a first perforation for the first ejection rod to pass through and a second perforation for the second ejection rod to pass through.

[0014] In one of the embodiments, the core box locking mechanism comprises two upper die locking members arranged symmetrically on the support table for locking the upper die and two locking assemblies arranged symmetrically on the outer side of the base for locking the frame.

[0015] In one of the embodiments, the upper die locking member is an L-shaped locking block hinged on the support table.

[0016] The locking assembly comprises a first support member fixed on the side of the frame, a second support member hinged on the first support member, and a locking member arranged on the second support member, the locking member is threadedly connected with the second support member and abuts against the lower core ejection mechanism.

[0017] In one of the embodiments, the side of the upper die and the frame is provided with a pin shaft, and the clamping shaft mechanism comprises at least one pin sleeve for the pin shaft to extend into and a clamping shaft assembly for locking the pin shaft in the corresponding pin sleeve.

[0018] In one of the embodiments, the clamping shaft assembly comprises two clamping block components arranged symmetrically on the radial two sides of the pin sleeve and a second driving component for driving the two clamping block components to move towards or away from each other.

[0019] In one of the embodiments, a guide assembly is arranged between the clamping block component and the mounting base, the guide assembly comprises a guide rod extending along the moving direction of the clamping block component and a linear bearing arranged on the mounting base and matched with the guide rod.

[0020] In one of the embodiments, a resilient member is further sleeved on the guide rod between the clamping block component and the mounting base.

[0021] In one of the embodiments, the core tine assembly comprises a plurality of core tines arranged at intervals, and the mounting base is provided with mounting slots, and the plurality of core tines are detachably arranged in the mounting slots;

[0022] The core tine comprises a first tine part extending in a vertical direction and a second tine part extending in a horizontal direction from the first tine part.

[0023] Compared with the prior art, the present application has the following advantages:

[0024] 1. After the sand core production is completed, the core box device is locked by the core taking device, and then the components and sand cores of the core box device are clamped by the clamp device in cooperation with the robot, so as to reduce the labor intensity, improve the core production efficiency, and solve the problem of difficult core taking of complex sand cores;

[0025] 2. The core taking device can lock the upper die and the sleeve frame of the core box device respectively, and has good stability;

[0026] 3. The clamp device cooperates with the ejection mechanism to quickly clamp the upper die, the sleeve frame and the sand core of the core box device, has good versatility, is convenient to operate, and has high efficiency;

[0027] 4. The sleeve frame and the sand core are respectively ejected by the ejection mechanism during core taking, and one power source can complete the core taking, thereby reducing the energy consumption. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0029] Fig. 1 is a structural schematic view of a core taking unit embodiment of the present application suitable for small-batch and multi-variety sand core production;

[0030] Fig. 2 is a structural schematic view of a core box device in the embodiment of the present application;

[0031] Fig. 3 is a structural schematic view of a core taking device in the embodiment of the present application;

[0032] Fig. 4 is a partial structural schematic view of an ejection mechanism in the embodiment of the present application;

[0033] Fig. 5 is a structural schematic view of a clamp device in the embodiment of the present application;

[0034] Fig. 6 is a structural schematic view of the clamp device in the embodiment of the present application;

[0035] Fig. 7 is a structural schematic view of the clamp device in the embodiment of the present application;

[0036] Figure 8 is a schematic diagram of the structure of the fixture device and the pin shaft in the embodiment of the present application;

[0037] Figure 9 is a schematic diagram of the structure of the fixture device clamping the sleeve frame in the embodiment of the present application;

[0038] Figure 10 is a schematic diagram of the structure of the fixture device clamping the sleeve frame in the embodiment of the present application;

[0039] Figure 11 is a schematic diagram of the structure of the fixture device clamping the sand core in the embodiment of the present application;

[0040] Figure 12 is a schematic diagram of the structure of the upper mold locking member locking the upper mold in the embodiment of the present application;

[0041] Figure 13 is a schematic diagram of the structure of the locking assembly locking the sleeve frame in the embodiment of the present application;

[0042] Figure 14 is a schematic diagram of the structure of the ejection mechanism ejecting the sleeve frame in the embodiment of the present application;

[0043] Figure 15 is a schematic diagram of the structure of the fixture device clamping the sleeve frame in the embodiment of the present application;

[0044] Figure 16 is a schematic diagram of the structure of the fixture device clamping the sand core in the embodiment of the present application;

[0045] Figure 17 is a schematic diagram of the structure of the fixture device clamping the upper mold in the embodiment of the present application;

[0046] Wherein:

[0047] 100, upper mold; 200, sleeve frame; 300, lower mold; 400, side mold; 500, lower core lifter mechanism; 501, lower platen; 502, lower ejector rod; 503, elastic return member; 600, sand core; 700, pin shaft; 701, limiting groove;

[0048] 1, frame; 1-1, base; 1-2, support table;

[0049] 2, ejection mechanism; 2-1, platen member; 2-2, first ejector rod; 2-3, second ejector rod; 2-4, first driving member; 2-5, guide rod;

[0050] 3, upper mold locking member;

[0051] 4, locking assembly; 4-1, first support member; 4-2, first support portion; 4-3, second support portion; 4-4, locking member;

[0052] 5, guide sleeve.

[0053] 6, mounting base; 6-1, sliding groove;

[0054] 7, core lifter fork; 7-1, first fork portion; 7-2, second fork portion

[0055] 8. pin sleeve;

[0056] 9. second driving component;

[0057] 10. clamping block;

[0058] 11. connecting plate;

[0059] 12. guide rod;

[0060] 13. elastic member;

[0061] 14. linear bearing. DETAILED DESCRIPTION

[0062] The above scheme is further described in combination with specific embodiments. It should be understood that these embodiments are used to illustrate the present application and do not limit the scope of the present application. The implementation conditions used in the embodiments can be further adjusted according to the specific conditions of the manufacturer, and the implementation conditions not mentioned are usually the conditions in the conventional experiments.

[0063] Referring to FIG. 1, which is a structural schematic diagram of an embodiment of the present application, a core taking unit suitable for small-batch and multi-variety sand core production is provided, which cooperates with a core box device and is used for taking cores during sand core making, and includes a core taking device and a clamp device. After the sand core 600 is made, the core box device is locked by the core taking device, and then the components of the core box device and the sand core 600 are clamped by the clamp device.

[0064] The core box device is used for forming the sand core 600, as shown in FIG. 2, and includes a sleeve frame 200, an upper mold 100 movably arranged on the sleeve frame 200, a lower mold 300 fixed in the sleeve frame 200, a plurality of side molds 400 movably arranged on the periphery of the lower mold, and a lower core lifting mechanism 500 installed on the sleeve frame 200. The sand core 600 is formed in a cavity between the upper mold 100, the lower mold 300, and the plurality of side molds 400, and the lower core lifting mechanism 500 extends into the cavity.

[0065] The lower core lifting mechanism 500 includes a lower top plate 501 and a plurality of lower top rods 502 arranged on the lower top plate 501. The lower top rods 502 extend into the cavity from the sleeve frame 200, and an elastic return member 503 is sleeved on the lower top rods 502 between the sleeve frame 200 and the lower mold 300. Preferably, the elastic return member 503 is a spring.

[0066] The core taking device is used for locking the core box device, as shown in FIG. 3, and includes a rack 1, a core box locking mechanism arranged on the rack 1 for locking the core box device, and an ejection mechanism 2 installed on the rack 1 for ejecting the sleeve frame 200 and the sand core 600.

[0067] The rack 1 comprises a base 1-1 and a support table 1-2 arranged on the base 1-1, the core box device is placed on the support table 1-2 after being turned over by 180 degrees, and the support table 1-2 comprises a plurality of vertical columns arranged vertically on the base 1-1, and the upper mold 100 is placed on the plurality of vertical columns.

[0068] The ejection mechanism 2 is arranged on the base 1-1 and comprises a top plate 2-1, a first ejection rod assembly arranged on the top plate 2-1 and used for ejecting the sleeve frame 200, a second ejection rod assembly used for ejecting the sand core 600, and a first driving component 2-4 used for driving the top plate 2-1 to move up and down, as shown in FIG. 4, wherein the first driving component 2-4 is an oil cylinder, the top plate 2-1 is in transmission connection with the oil cylinder, and the top plate 2-1 is driven to move up and down by the oil cylinder, so as to drive the first ejection rod assembly and the second ejection rod assembly to move up and down.

[0069] The second ejection rod assembly comprises a plurality of second ejection rods 2-3 arranged in the middle of the top plate 2-1, and the first ejection rod assembly comprises a plurality of first ejection rods 2-2 arranged on the outer periphery of the second ejection rod assembly, the height of the first ejection rod 2-2 is greater than that of the second ejection rod 2-3, and correspondingly, a first perforation for the first ejection rod 2-2 to pass through and a second perforation for the second ejection rod 2-3 to pass through are arranged on the upper mold 100, when the first driving component 2-4 drives the top plate 2-1 to move upwards, the first ejection rod 2-2 is first extended above the upper mold 100 to eject the sleeve frame 200, so as to facilitate the clamp device to take away the sleeve frame 200, after a plurality of side molds 400 are manually taken away, the first driving component 2-4 drives the top plate 2-1 to continue to move upwards, and the second ejection rod 2-3 ejects the sand core 600 on the upper mold 100, so as to facilitate the clamp device to take away the sand core 600.

[0070] Preferably, the plurality of second ejection rods 2-3 are arranged in an array, and the sand core 600 can be stably ejected.

[0071] In order to improve the stability of the operation of the ejection mechanism 2, the ejection mechanism 2 further comprises a guide rod assembly, the guide rod assembly comprises a plurality of guide rods 2-5 arranged at the lower end of the top plate 2-1, and a plurality of guide sleeves 5 matched with the plurality of guide rods 2-5 are arranged on the base 1-1, when the first driving component 2-4 drives the top plate 2-1 to move up and down, the guide rods 2-5 move up and down in the guide sleeves 5, so as to avoid deviation of the top plate 2-1 during the up and down movement.

[0072] The core box locking mechanism is installed on the rack 1 and cooperates with the rack 1 to lock the core box device, and comprises two upper mold locking members 3 arranged symmetrically on the support table 1-2 and used for locking the upper mold 100, and two locking assemblies arranged symmetrically on the outer side of the base 1-1 and used for locking the sleeve frame 200.

[0073] The upper die locking member 3 is an L-shaped locking block hinged on the support table 1-2, the upper die 100 is placed on the support table 1-2, and the upper die 100 is clamped on the support table 1-2 by rotating the upper die locking member 3.

[0074] The locking assembly comprises a first support member 4-1 fixed on the side of the base 1-1, a second support member hinged on the first support member 4-1, and a locking member 4-4 arranged on the second support member. The first support member 4-1 extends vertically upward, the second support member comprises a first support part 4-2 hinged with the first support member 4-1 and a second support part 4-3 connected with the first support part 4-2 at right angles, wherein the second support part 4-3 extends to the middle part of the rack 1, and the locking member 4-4 is arranged at the end of the second support part 4-3. When the sleeve frame 200 needs to be locked, the second support member is rotated to make the locking member 4-4 above the sleeve frame 200 to lock the sleeve frame 200 on the upper die 100.

[0075] In this example, the locking member 4-4 is threadedly connected with the second support part and can abut against the lower core mechanism 500. The sleeve frame 200 is locked on the upper die 100 by rotating the locking member 4-4 to abut against the lower core mechanism 500.

[0076] As shown in FIGS. 5-7, the clamp device comprises a mounting base 6, a core taking fork assembly arranged on the mounting base 6 for clamping the sand core 600, and a clamping shaft mechanism for clamping the upper die 100 and the sleeve frame 200. Two pin shafts 700 are arranged at intervals on the side of the upper die 100 and the sleeve frame 200. Correspondingly, the clamping shaft mechanism comprises two pin sleeves 8 for the pin shafts 700 to extend into and a clamping shaft assembly for locking the pin shafts 700 in the corresponding pin sleeves 8. The clamping shaft assembly is arranged on one axial side of the pin sleeve 8. The pin shafts 700 are clamped in the corresponding pin sleeves 8 by the clamping shaft assembly, so that the clamp device clamps the upper die 100 or the sleeve frame 200 (as shown in FIGS. 9 and 10).

[0077] Specifically, the clamping shaft assembly comprises two clamping block components symmetrically arranged on the radial two sides of the pin sleeve 8 and a second driving component 9 for moving the two clamping block components towards or away from each other. Preferably, the second driving component 9 is a double-shaft air cylinder arranged in parallel from top to bottom, which can drive the two clamping block components to move synchronously, realize the clamping or releasing of the pin shafts 700, and ensure the stability of the movement of the clamping block assembly (as shown in FIG. 8).

[0078] The clamping block component comprises a clamping block 10 and a connecting plate 11 connecting the clamping block 10 with the second driving component 9. An arc-shaped positioning groove is arranged on the side of the clamping block 10 facing the pin shaft 700, so as to clamp the pin shaft 700 by the two clamping blocks 10.

[0079] In order to improve the stability of the structure, a limiting groove 701 matched with the clamping block 10 is arranged on the outer wall of the pin shaft 700, and the two clamping blocks 10 are driven to move towards each other to the limiting groove 701 by the second driving component 9 to realize the clamping of the pin shaft 700.

[0080] In order to further improve the stability of the structure, a sliding groove matched with the connecting plate 11 is arranged on the mounting base 6.

[0081] In order to further improve the stability of the clamping structure, at least one guide assembly is arranged between the clamping block component and the mounting base 6, preferably two guide rod assemblies arranged above and below the clamping block component are arranged to ensure the stability of the structure. Specifically, the guide assembly comprises a guide rod 12 extending along the moving direction of the clamping block component and a linear bearing 14 arranged on the mounting base 6 and matched with the guide rod 12, when the clamping block component is driven to move by the second driving component 9, the guide rod 12 slides in the linear bearing 14 to play a guiding role, avoiding the deviation of the clamping block component.

[0082] In order to further improve the stability of the structure and facilitate the stable clamping of the clamping block component on the pin shaft 700, an elastic member 13 is arranged on the guide rod 12 between the clamping block component and the mounting base 5. The arrangement of the elastic member can make the clamping block 10 stably clamp on the pin shaft 700, even if the second driving component 9 cannot work normally, the work of the clamping shaft mechanism can still be ensured, preferably, the elastic member 13 is a spring.

[0083] The core fork assembly comprises a plurality of core forks 7 arranged at intervals, and a mounting groove is arranged on the mounting base 6, and the plurality of core forks 7 can be detachably arranged in the mounting groove. When in use, the number and position of the core forks 7 can be selected according to the needs to adapt to the clamping of different sand core products.

[0084] Specifically, the core fork 7 comprises a first fork part 7-1 extending in the vertical direction and a second fork part 7-2 extending in the horizontal direction from the first fork part 7-1, that is, the second fork part 7-2 is connected with the first fork part 7-1 in an L shape. As shown in FIG. 11, when clamping the sand core 600, the second fork part 7-2 is placed below the sand core 600, and the clamp device can be clamped by the robot upwardly.

[0085] The working principle of the present application is as follows:

[0086] After the sand core 600 is made, the pin shaft 700 on the side of the sleeve frame 200 of the core box device is clamped by the clamping shaft assembly of the clamping device, the core box device is carried out of the core making machine as a whole, is turned over by 180 degrees, is finally carried to the support table 1-2 of the core taking device, the upper die 100 is locked on the support table 1-2 by rotating the upper die locking part 3, the locking hooks of the upper die 100 and the sleeve frame 200 are opened (as shown in Fig. 12), then the second support part is rotated to make the locking part 4-4 above the core box device, the locking part 4-4 is abutted on the lower core ejecting mechanism 500 to lock the whole core box device (as shown in Fig. 13); the top plate part 2-1 is driven by the first driving part 2-4 to move upward to eject the sleeve frame 200, under the action of the lower ejecting rod mechanism 500, the sand core 600 is separated from the lower die 300 (as shown in Fig. 14), the two locking assemblies are opened, the sleeve frame 200 is taken away by the clamping device (as shown in Fig. 15), after the multiple side dies 400 are taken away manually, the ejecting mechanism 2 is lifted upward to eject the sand core 600 from the upper die 100, then the sand core 600 is taken away by the clamping device (as shown in Fig. 16), the ejecting mechanism 2 is reset, the upper die locking part 3 of the upper die 100 and the support table 1-2 is opened, finally the upper die 100 is taken away by the clamping device (as shown in Fig. 17).

[0087] In summary, the core taking unit suitable for small-batch and multi-variety sand core production can realize semi-automatic core taking, clamping of the core box device and other operations, reduces the labor intensity, and improves the efficiency of small-batch and multi-variety core making.

[0088] The above examples are only for illustrating the technical concept and characteristics of the present application, the purpose is to enable the person skilled in the art to understand the content of the present application and to implement it, and cannot limit the protection scope of the present application. Any equivalent transformation or modification according to the spirit and essence of the present application should be covered within the protection scope of the present application.

Claims

1. A core taking unit suitable for small batch multi-variety core production, which cooperates with a core box device, said core box device comprising a housing frame, an upper mold movably arranged on said housing frame, a lower mold fixed in said housing frame, a plurality of side molds movably arranged circumferentially on said lower mold, and a lower core lifting mechanism mounted on said housing frame, a sand core being formed in a cavity formed by said upper mold, said lower mold and said plurality of side molds, said lower core lifting mechanism extending into said cavity, characterized in that, The core taking unit comprises: The core taking device for locking the core box device comprises a frame, a core box locking mechanism arranged on the frame for locking the core box device, and an ejection mechanism mounted on the frame for ejecting the sleeve frame and the sand core; The clamp device for clamping the upper die, the sleeve frame and the sand core comprises a mounting base, a core taking fork assembly arranged on the mounting base for clamping the sand core, and a clamping shaft mechanism for clamping the upper die and the sleeve frame.

2. A core-units suitable for small-batch, multi-variety sand core production according to claim 1, characterized in that: The frame comprises a base and a support table arranged on the base, and the core box device is arranged on the support table.

3. A core-units suitable for small-batch, multi-variety sand core production according to claim 2, characterized in that: The ejection mechanism comprises a top plate, a first ejection rod assembly arranged on the upper end of the top plate for ejecting the sleeve frame, a second ejection rod assembly for ejecting the sand core, a first driving component for driving the top plate to move up and down, and a guide rod assembly arranged on the lower end of the top plate; The second ejection rod assembly comprises a plurality of second ejection rods arranged in the middle of the top plate, and the first ejection rod assembly comprises a plurality of first ejection rods arranged on the outer periphery of the second ejection rod assembly, the height of the first ejection rod being greater than that of the second ejection rod, and the upper die being provided with a first perforation for the first ejection rod to pass through and a second perforation for the second ejection rod to pass through.

4. A core-units suitable for small-batch, multi-variety sand core production according to claim 2, characterized in that: The core box locking mechanism comprises two upper die locking pieces symmetrically arranged on the support table for locking the upper die and two locking assemblies symmetrically arranged on the outer side of the base for locking the sleeve frame.

5. A core-units suitable for small-batch, multi-variety sand core production according to claim 4, characterized in that: The upper die locking piece is an L-shaped locking block hinged to the support table. The locking assembly comprises a first support piece fixed to the side of the frame, a second support piece hinged to the first support piece, and a locking piece arranged on the second support piece, the locking piece being threadedly connected with the second support piece and abutting against the lower core ejection mechanism.

6. A core-units suitable for small-batch, multi-variety sand core production according to claim 1, characterized in that: The side of the upper die and the sleeve frame is provided with a pin shaft, and the clamping shaft mechanism comprises at least one pin sleeve for the pin shaft to extend into and a clamping shaft assembly for locking the pin shaft in the corresponding pin sleeve.

7. A core-units suitable for small-batch, multi-variety sand core production according to claim 6, characterized in that: The clamping shaft assembly comprises two clamping block components symmetrically arranged on the radial two sides of the pin sleeve and a second driving component for driving the two clamping block components to move towards or away from each other.

8. A core-units suitable for small-batch, multi-variety sand core production according to claim 7, characterized in that: A guide assembly is arranged between the clamping block component and the mounting base, and the guide assembly comprises a guide rod extending along the moving direction of the clamping block component and a linear bearing arranged on the mounting base and matched with the guide rod.

9. A core-units suitable for small-batch, multi-variety sand core production according to claim 8, characterized in that: An elastic piece is further sleeved on the guide rod between the clamping block component and the mounting base.

10. A core-units suitable for small-batch, multi-variety sand core production according to claim 6, characterized in that: The core taking fork assembly comprises a plurality of core taking forks arranged at intervals, and the mounting base is provided with a mounting groove, and the plurality of core taking forks are detachably arranged in the mounting groove. The core taking fork comprises a first fork portion extending in the vertical direction and a second fork portion extending in the horizontal direction from the first fork portion.

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