A multi-link core-pulling mechanism for a sand core forming process

Abstract

The present application relates to sand core preparation technical field, disclose a kind of for the multiple connecting rod type core pulling mechanism of sand core forming process, including mounting bracket and the lower core box being fixed on the bottom inner wall of mounting bracket, the upper portion of lower core box is equipped with the mounting plate one sliding in the inside of mounting bracket, the mounting plate two sliding in the inside of mounting bracket is equipped between the mounting plate one and lower core box, the side of mounting plate one close to mounting plate two is fixed with multiple piston end fixed on the hydraulic cylinder one of mounting plate two, the side of mounting plate two close to lower core box is fixed with the upper core box matched with lower core box, the end of mounting plate one away from the side of hydraulic cylinder one is fixed with the connecting column being rotatably connected on the top inner wall of mounting bracket.The present application can be adaptively regulated and controlled to core box, can be conveniently taken out sand core inside core box by staff, can be protected to idle core box, it is convenient to maintain, easy to use.

Description

Technical Field

[0001] This invention relates to the field of sand core preparation technology, and in particular to a multi-link core-pulling mechanism for sand core forming process. Background Technology

[0002] Sand cores are an important part of the casting process, used to form internal cavities or complex shapes in castings. The preparation of sand cores requires the use of appropriate molds to shape the sand material.

[0003] While existing molds can process sand into shapes, most of them are fixed in position during use, making it difficult to adapt and adjust the molds according to the needs of the operators. When the molds need maintenance after a long period of use, the mutual obstruction between the upper and lower molds makes it difficult for operators to maintain the molds quickly, resulting in poor performance. To address this, we propose a multi-link core-pulling mechanism for sand core forming processes. Summary of the Invention

[0004] To address the technical problem of inconvenient maintenance of existing molds, this invention provides a multi-link core-pulling mechanism for sand core forming processes.

[0005] This invention is achieved using the following technical solution: a multi-link core-pulling mechanism for sand core forming process, comprising a mounting frame and a lower core box fixed to the inner wall of the bottom of the mounting frame. Above the lower core box is a mounting plate one that slides inside the mounting frame. Between the mounting plate one and the lower core box is a mounting plate two that slides inside the mounting frame. Multiple hydraulic cylinders one with piston ends fixed to the mounting plate two are fixed to the side of the mounting plate one near the mounting plate two. An upper core box that mates with the lower core box is fixed to the side of the mounting plate two near the lower core box. The mounting plate one is located away from the hydraulic cylinders. One end of the cylinder is fixed with a connecting column that is rotatably connected to the inner wall of the top of the mounting frame. The operation of the hydraulic cylinder drives the upper core box to move vertically. When the upper and lower core boxes are closed, sand is injected into the upper and lower core boxes. Through the cooperation of the upper and lower core boxes, the sand inside is made into a sand core. The rotation of the connecting column drives the mounting plate one, mounting plate two and the upper core box to deflect. When the upper and lower core boxes are misaligned, the staff can easily maintain the upper and lower core boxes and avoid the upper and lower core boxes from obstructing each other.

[0006] As a further improvement to the above solution, a power connecting rod is provided on one side of the lower core box cavity, sliding inside the lower core box. A side-pulling block one is fixed to the side of the power connecting rod near the lower core box cavity. Piston cylinders with their piston ends fixed to the power connecting rod are fixed to both ends of the lower core box cavity. A side-pulling block two is provided on the other side of the lower core box cavity, sliding inside the lower core box. A threaded sleeve is rotatably connected inside the lower core box. The threads at both ends of the threaded sleeve are in opposite directions. A screw one is rotatably connected to one end of the threaded sleeve. A connecting rod connector one is fixed to the end of the screw one away from the threaded sleeve. A transmission connector one is connected to the outside of the connecting rod connector one, with its other end connected to the side-pulling block two. The screw is rotatably connected to the other end of the threaded sleeve. The end of the screw away from the threaded sleeve is fixed to the connecting rod joint 2 connected to the power connecting rod. When it is necessary to remove the sand core inside the lower core box, the operation of the hydraulic cylinder drives the side pull block 1 and the power connecting rod to move. When the power connecting rod moves, it will drive the threaded sleeve, screw 1 and screw 2 to move, drive the transmission connecting rod to move, and drive the side pull block 2 to move away from the sand core. By rotating the threaded sleeve, the distance between screw 1 and screw 2 can be adjusted through the threaded engagement between the threaded sleeve and screw 1 and screw 2, and the distance between connecting rod joint 1 and connecting rod joint 2 can also be adjusted.

[0007] As a further improvement to the above solution, a gear is fixedly sleeved on the outer wall of the connecting column, and a rack meshing with the gear is provided on the outer side of the gear. A sliding groove is provided on the inner wall of the top of the mounting bracket, and a slider is slidably connected inside the sliding groove. One end of the rack is fixed on the slider. A second hydraulic cylinder with its piston end fixed on the inner wall of the top of the mounting bracket is fixed. By operating the second hydraulic cylinder, the rack can be moved. Through the cooperation of the rack and the gear, the gear and the connecting column are rotated.

[0008] As a further improvement to the above solution, a protective shell is fixed to the side of the mounting plate two near the lower core box, which slides and engages with the lower core box. A protective shell two is fixed to the inner wall of the bottom of the mounting frame, which slides and engages with the upper core box. Both ends of the protective shell one and the protective shell two are provided with mounting grooves. A breathable mesh is slidably connected inside the mounting groove. Both ends of the breathable mesh are provided with sliding holes. A lead screw slides through the sliding holes. One end of the lead screw is fixed to the inner wall of the adjacent mounting groove. A limiting sleeve is threaded onto the outer thread of the other end of the lead screw. A connecting spring is movably sleeved on the outside of the lead screw located between the limiting sleeve and the adjacent breathable mesh. Sliding plates are slidably connected inside the protective shell one and the protective shell two. Drive sleeves are embedded at both ends of the sliding plates. A transmission rod is threaded through the inner thread of the drive sleeve. A cam that engages with the adjacent breathable mesh is fixedly sleeved on the outer wall of the transmission rod. Through the operation of the above components, the breathable mesh of the core box can be periodically cleared, improving the endurance of the breathable mesh. The breathable mesh can be easily disassembled and replaced according to usage needs.

[0009] As a further improvement to the above scheme, one end of the transmission rod located inside the protective shell is rotatably connected to the mounting plate 2, and the other end of the transmission rod located inside the protective shell is fixed to a blocking block 1. A connecting spring 2 is movably sleeved on the outside of the transmission rod between the sliding plate inside the protective shell and the adjacent blocking block 1. One end of the connecting spring 2 is fixed to the adjacent sliding plate, and the other end of the connecting spring 2 is fixed to the adjacent blocking block 1. One end of the transmission rod located inside the protective shell 2 is rotatably connected to the inner wall of the bottom of the mounting frame, and the other end of the transmission rod located inside the protective shell 2 is fixed to a blocking block 2. A connecting spring 3 is movably sleeved on the outside of the transmission rod between the sliding plate inside the protective shell 2 and the adjacent blocking block 2. One end of the connecting spring 3 is fixed to the adjacent sliding plate, and the other end of the connecting spring 3 is fixed to the adjacent blocking block 2. Through the restoring elasticity of the connecting spring 2 and the connecting spring 3, the sliding plate that is being displaced can be pushed to return to its original position.

[0010] As a further improvement to the above solution, an annular groove is provided on the inner wall of the top of the mounting bracket. A stabilizing ring is slidably connected inside the annular groove, and a support column fixed on the stabilizing ring is slidably connected inside the annular groove. The other end of the support column is fixed on the mounting plate. The support column can support the mounting plate and improve its stability.

[0011] As a further improvement to the above solution, a second support column fixed to a stabilizing ring is slidably connected inside the annular groove. A sliding groove is provided at the other end of the second support column, and a third support column slides through the opening of the sliding groove. A limiting block is fixed at one end of the third support column, which slides inside the sliding groove, and the other end of the third support column is fixed to the second mounting plate. The length of the limiting block is greater than the width of the opening of the sliding groove. Through the cooperation of the second and third support columns, the deflection of the second mounting plate can be limited, preventing the second mounting plate from shifting during the deflection process and improving the stability of the second mounting plate.

[0012] As a further improvement to the above solution, the diameter of the limiting sleeve is larger than the diameter of the sliding hole, and the outer wall of the limiting sleeve is provided with anti-slip texture. By using the limiting sleeve with a diameter larger than the diameter of the sliding hole, the limiting sleeve can be prevented from sliding into the sliding hole.

[0013] As a further improvement to the above solution, the rack slides into the groove, and the length of the slider is greater than the width of the groove. By using a slider whose length is greater than the width of the groove, the slider can be prevented from sliding out of the groove.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] 1. This invention allows for adaptive adjustment of the core box according to the usage needs of the staff, thereby facilitating the maintenance of the core box. It is easy to use and allows the staff to easily remove the sand core inside the core box. It can also protect the idle core box, preventing it from being exposed to the outside world for a long time and being attached to external debris when it is not in use, thus providing high protection performance.

[0016] 2. This invention can periodically unclog the ventilation components of the core box, improve the endurance of the ventilation components, and allow for simple and convenient disassembly and replacement of the ventilation components according to usage requirements. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a multi-link core-pulling mechanism used in sand core forming process.

[0018] Figure 2 This is a schematic diagram of the misaligned state of the lower core box and the upper core box in a multi-link core pulling mechanism used in sand core forming process.

[0019] Figure 3 This is a top view of the lower core box in a multi-link core-pulling mechanism used in sand core forming process;

[0020] Figure 4 for Figure 2 Enlarged structural diagram at point A;

[0021] Figure 5 for Figure 2 Enlarged structural diagram at point B;

[0022] Figure 6 for Figure 2 Enlarged structural diagram at point C.

[0023] Explanation of key symbols:

[0024] 1. Mounting bracket; 2. Lower core box; 3. Mounting plate one; 4. Mounting plate two; 5. Hydraulic cylinder one; 6. Upper core box; 7. Connecting column; 8. Gear; 9. Rack; 10. Slide groove; 11. Slider; 12. Hydraulic cylinder two; 13. Protective shell one; 14. Protective shell two; 15. Mounting groove; 16. Ventilation mesh; 17. Lead screw; 18. Limiting sleeve; 19. Slide plate; 20. Drive sleeve; 21. Transmission rod; 22. Cam; 23. Connecting spring three; 24. Annular groove; 25. Stabilizing ring; 26. Support column two; 27. Sliding groove; 28. Support column three; 29. ​​Limiting block; 30. Support column one. Detailed Implementation

[0025] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0026] Example 1:

[0027] Combination Figure 1 This embodiment of a multi-link core-pulling mechanism for sand core forming process includes a mounting frame 1 and a lower core box 2 fixed on the bottom inner wall of the mounting frame 1. A mounting plate 3 that slides inside the mounting frame 1 is provided above the lower core box 2. A mounting plate 4 that slides inside the mounting frame 1 is provided between the mounting plate 3 and the lower core box 2. A plurality of hydraulic cylinders 5 with piston ends fixed on the mounting plate 4 are fixed on the side of the mounting plate 3 near the mounting plate 4. An upper core box 6 that cooperates with the lower core box 2 is fixed on the side of the mounting plate 4 near the lower core box 2. A connecting column 7 that is rotatably connected to the top inner wall of the mounting frame 1 is fixed at the end of the mounting plate 3 away from the hydraulic cylinders 5.

[0028] The implementation principle of a multi-link core-pulling mechanism for sand core forming process in this application embodiment is as follows: the operation of hydraulic cylinder 5 drives the mounting plate 4 and the upper core box 6 to move vertically. When the upper core box 6 and the lower core box 2 are closed, sand is injected into the upper core box 6 and the lower core box 2. At this time, the sand inside can be prepared into a sand core through the cooperation of the upper core box 6 and the lower core box 2. When it is necessary to maintain the upper core box 6 and the lower core box 2, the rotation of the connecting column 7 can drive the mounting plate 3, the mounting plate 4 and the upper core box 6 to deflect. When the upper core box 6 and the lower core box 2 are misaligned, the staff can easily maintain the upper core box 6 and the lower core box 2, avoiding mutual obstruction between the upper core box 6 and the lower core box 2.

[0029] Example 2:

[0030] Combination Figure 3This embodiment, based on embodiment 1, further improves upon the following: A power connecting rod is provided on one side of the cavity of the lower core box 2, sliding inside the lower core box 2. A side-pulling block one is fixed to the side of the power connecting rod near the cavity of the lower core box 2. Piston cylinders with their piston ends fixed to the power connecting rod are fixed to both ends of the cavity of the lower core box 2. A side-pulling block two is provided on the other side of the cavity of the lower core box 2, sliding inside the lower core box 2. A threaded sleeve is rotatably connected inside the lower core box 2. The threads at both ends of the threaded sleeve are in opposite directions. A screw one is rotatably connected to one end of the threaded sleeve. A connecting rod connector one is fixed to the end of the screw one away from the threaded sleeve. The other end of the connecting rod connector one is connected to the side-pulling block two. The transmission connecting rod has a screw rod rotatably connected to the other end of the threaded sleeve. The end of the screw rod away from the threaded sleeve is fixed with a connecting rod joint 2 connected to the power connecting rod. When it is necessary to remove the sand core inside the lower core box 2, the operation of the hydraulic cylinder drives the side pull block 1 and the power connecting rod to move. When the power connecting rod moves, it will drive the threaded sleeve, screw rod 1 and screw rod 2 to move, drive the transmission connecting rod to move, and drive the side pull block 2 to move away from the sand core. By rotating the threaded sleeve, the distance between screw rod 1 and screw rod 2 can be adjusted through the threaded engagement between the threaded sleeve and screw rod 1 and screw rod 2, and the distance between connecting rod joint 1 and connecting rod joint 2 can also be adjusted.

[0031] Example 3:

[0032] Combination Figure 4 Based on Embodiment 1, this embodiment is further improved in that: a gear 8 is fixedly sleeved on the outer wall of the connecting column 7, a rack 9 that meshes with the gear 8 is provided on the outer side of the gear 8, a sliding groove 10 is provided on the inner wall of the top of the mounting bracket 1, a slider 11 is slidably connected inside the sliding groove 10, one end of the rack 9 is fixed on the slider 11, and a hydraulic cylinder 2 12 with its piston end fixed on the inner wall of the top of the mounting bracket 1 is fixed. Through the operation of the hydraulic cylinder 2 12, the rack 9 can be moved. Through the cooperation of the rack 9 and the gear 8, the gear 8 and the connecting column 7 are rotated.

[0033] Example 4:

[0034] Combination Figure 2 , Figure 5 and Figure 6This embodiment is further improved on the basis of embodiment 1 as follows: A protective shell 13 that slides and engages with the lower core box 2 is fixed to the side of the mounting plate 2 4 near the lower core box 2; a protective shell 14 that slides and engages with the upper core box 6 is fixed to the inner wall of the bottom of the mounting bracket 1; mounting grooves 15 are provided at both ends of the protective shell 13 and the protective shell 14; a breathable mesh 16 is slidably connected inside the mounting groove 15; sliding holes are provided at both ends of the breathable mesh 16; a lead screw 17 slides through the sliding holes; one end of the lead screw 17 is fixed to the inner wall of the adjacent mounting groove 15; a limiting sleeve 18 is threaded onto the outer side of the other end of the lead screw 17; and the lead screw 17 is located between the limiting sleeve 18 and the adjacent breathable mesh 16. The external movable sleeve is equipped with a connecting spring. Slide plates 19 are slidably connected inside both the first protective shell 13 and the second protective shell 14. Drive sleeves 20 are embedded at both ends of the slide plates 19. A transmission rod 21 is threaded through the interior of the drive sleeve 20. A cam 22, which mates with the adjacent ventilation mesh 16, is fixedly sleeved on the outer wall of the transmission rod 21. When the upper core box 6 and lower core box 2 are idle, the operation of the hydraulic cylinder 5 can drive the mounting plate 24 and the upper core box 6 to move vertically downwards. When the upper core box 6 enters the interior of the second protective shell 14 and the lower core box 2 enters the interior of the first protective shell 13, the lower core box 2 is protected inside the first protective shell 13, and the upper core box 6 is protected inside the second protective shell 14, preventing the upper core box from being exposed to the outside. When idle, core box 6 and lower core box 2 are exposed to the outside environment and accumulate debris. Ventilation is provided through the ventilation mesh 16, allowing ventilation for the lower core box 2 inside protective shell 13 and the upper core box 6 inside protective shell 2 14. When upper core box 6 enters the interior of protective shell 2 14 and lower core box 2 enters the interior of protective shell 13, they will press against the sliding plate 19, causing displacement. This displacement drives the drive sleeve 20 vertically, rotating the transmission rod 21 and the cam 22. The rotating cam 22 will intermittently press against the ventilation mesh 16, causing it to move. When the cam 22 separates from the ventilation mesh 16, it is connected to the spring... The reset elasticity will push the ventilated mesh 16 to reset displacement. At this time, the ventilated mesh 16 will vibrate slightly with the mounting groove 15. The vibration of the ventilated mesh 16 will clear the through holes of the ventilated mesh 16, preventing the through holes of the ventilated mesh 16 from being blocked by external debris after long-term ventilation. By rotating the limiting sleeve 18, the limiting sleeve 18 will be moved by the threaded engagement with the lead screw 17. When the limiting sleeve 18 is disengaged from the lead screw 17, the ventilated mesh 16 can be pulled and moved. When the ventilated mesh 16 is disengaged from the lead screw 17, the ventilated mesh 16 can be replaced and repaired.

[0035] One end of the transmission rod 21 located inside the protective shell 13 is rotatably connected to the mounting plate 2 4. The other end of the transmission rod 21 located inside the protective shell 13 is fixed to a blocking block 1. A connecting spring 2 is movably sleeved on the outside of the transmission rod 21 between the sliding plate 19 inside the protective shell 13 and the adjacent blocking block 1. One end of the connecting spring 2 is fixed to the adjacent sliding plate 19, and the other end of the connecting spring 2 is fixed to the adjacent blocking block 1. One end of the transmission rod 21 located inside the protective shell 2 14 is rotatably connected to the inner wall of the bottom of the mounting frame 1. The other end of the transmission rod 21 located inside the protective shell 2 14 is fixed to a blocking block 2. A connecting spring 3 23 is movably sleeved on the outside of the transmission rod 21 between the sliding plate 19 inside the protective shell 2 14 and the adjacent blocking block 2. One end of the connecting spring 3 23 is fixed to the adjacent sliding plate 19, and the other end of the connecting spring 3 23 is fixed to the adjacent blocking block 2. Through the reset elasticity of the connecting spring 2 and the connecting spring 3 23, the sliding plate 19 that is being displaced can be pushed to reset its displacement.

[0036] An annular groove 24 is provided on the inner wall of the top of the mounting bracket 1. A stabilizing ring 25 is slidably connected inside the annular groove 24. A support column 30 fixed on the stabilizing ring 25 is slidably connected inside the annular groove 24. The other end of the support column 30 is fixed on the mounting plate 3. The support column 30 can support the mounting plate 3 and improve the stability of the mounting plate 3.

[0037] The annular groove 24 is slidably connected to a second support column 26 fixed on a stabilizing ring 25. The other end of the second support column 26 is provided with a sliding groove 27. A third support column 28 is slidably inserted through the opening of the sliding groove 27. One end of the third support column 28 is fixed with a limiting block 29 that slides inside the sliding groove 27. The other end of the third support column 28 is fixed to the second mounting plate 4. The length of the limiting block 29 is greater than the width of the opening of the sliding groove 27. Through the cooperation of the second support column 26 and the third support column 28, the deflection of the second mounting plate 4 can be limited, preventing the second mounting plate 4 from shifting during the deflection process and improving the stability of the second mounting plate 4.

[0038] The diameter of the limiting sleeve 18 is larger than the diameter of the sliding hole, and the outer wall of the limiting sleeve 18 is provided with anti-slip texture. By using the limiting sleeve 18, whose diameter is larger than the diameter of the sliding hole, the limiting sleeve 18 can be prevented from sliding into the sliding hole.

[0039] The rack 9 slides into the groove of the slide 10. The length of the slider 11 is greater than the width of the groove of the slide 10. By using the slider 11, whose length is greater than the width of the groove of the slide 10, the slider 11 can be prevented from sliding out of the interior of the slide 10.

[0040] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A multi-link core-pulling mechanism for sand core forming process, comprising a mounting frame and a lower core box fixed to the inner wall of the bottom of the mounting frame, characterized in that, Above the lower core box is a mounting plate 1 that slides inside the mounting frame. Between the mounting plate 1 and the lower core box is a mounting plate 2 that slides inside the mounting frame. On the side of the mounting plate 1 near the mounting plate 2, there are multiple hydraulic cylinders 1 with piston ends fixed on the mounting plate 2. On the side of the mounting plate 2 near the lower core box, there is an upper core box that cooperates with the lower core box. On the end of the mounting plate 1 away from the hydraulic cylinders 1, there is a connecting column that is rotatably connected to the inner wall of the top of the mounting frame. The mounting plate 2 has a protective shell 1 that slides and engages with the lower core box fixed on its side near the lower core box. The inner wall of the bottom of the mounting frame has a protective shell 2 that slides and engages with the upper core box. Both ends of the protective shell 1 and the protective shell 2 have mounting grooves. A breathable mesh is slidably connected inside the mounting groove. Both ends of the breathable mesh have sliding holes. A lead screw slides through the sliding holes. One end of the lead screw is fixed to the inner wall of the adjacent mounting groove. A limiting sleeve is threaded onto the outer side of the other end of the lead screw. A connecting spring 1 is movably sleeved on the outside of the lead screw located between the limiting sleeve and the adjacent breathable mesh. Both the protective shell 1 and the protective shell 2 have sliding plates slidably connected inside. Both ends of the sliding plates are fitted with drive sleeves. A transmission rod is threaded through the inner side of the drive sleeve. A cam that engages with the adjacent breathable mesh is fixedly sleeved on the outer wall of the transmission rod.

2. The multi-link core-pulling mechanism for sand core forming process as described in claim 1, characterized in that, A power connecting rod that slides inside the lower core box cavity is provided on one side. A side pull block 1 is fixed to the side of the power connecting rod near the lower core box cavity. Piston cylinders fixed to the power connecting rod are fixed at both ends of the lower core box cavity. A side pull block 2 that slides inside the lower core box cavity is provided on the other side of the lower core box cavity. A threaded sleeve is rotatably connected inside the lower core box. The threads at both ends of the threaded sleeve are in opposite directions. A screw 1 is rotatably connected to one end of the threaded sleeve. A connecting rod connector 1 is fixed to the end of the screw 1 away from the threaded sleeve. A transmission connecting rod connected to the other end of the connecting rod connector 1 is connected to the outside of the connecting rod connector 1. A screw 2 is rotatably connected to the other end of the threaded sleeve. A connecting rod connector 2 is fixed to the power connecting rod at the end of the screw 2 away from the threaded sleeve.

3. The multi-link core-pulling mechanism for sand core forming process as described in claim 1, characterized in that, A gear is fixedly sleeved on the outer wall of the connecting column. A rack that meshes with the gear is provided on the outer side of the gear. A sliding groove is provided on the inner wall of the top of the mounting bracket. A slider is slidably connected inside the sliding groove. One end of the rack is fixed on the slider. A hydraulic cylinder with its piston end fixed on the rack is fixed on the inner wall of the top of the mounting bracket.

4. A multi-link core-pulling mechanism for sand core forming process as described in claim 1, characterized in that, One end of a transmission rod located inside the protective shell is rotatably connected to the mounting plate 2. The other end of the transmission rod located inside the protective shell is fixed to a blocking block 1. A connecting spring 2 is movably sleeved on the outside of the transmission rod between the sliding plate inside the protective shell and the adjacent blocking block 1. One end of the connecting spring 2 is fixed to the adjacent sliding plate, and the other end of the connecting spring 2 is fixed to the adjacent blocking block 1. One end of a transmission rod located inside the protective shell 2 is rotatably connected to the inner wall of the bottom of the mounting frame. The other end of the transmission rod located inside the protective shell 2 is fixed to a blocking block 2. A connecting spring 3 is movably sleeved on the outside of the transmission rod between the sliding plate inside the protective shell 2 and the adjacent blocking block 2. One end of the connecting spring 3 is fixed to the adjacent sliding plate, and the other end of the connecting spring 3 is fixed to the adjacent blocking block 2.

5. A multi-link core-pulling mechanism for sand core forming process as described in claim 1, characterized in that, The inner wall of the top of the mounting bracket is provided with an annular groove, and a stabilizing ring is slidably connected inside the annular groove. A support column is slidably connected inside the annular groove and fixed on the stabilizing ring. The other end of the support column is fixed on the mounting plate.

6. A multi-link core-pulling mechanism for sand core forming process as described in claim 5, characterized in that, The annular groove is slidably connected to a second support column fixed on a stabilizing ring. The other end of the second support column has a sliding groove. A third support column slides through the opening of the sliding groove. One end of the third support column is fixed with a limiting block that slides inside the sliding groove. The other end of the third support column is fixed to a second mounting plate. The length of the limiting block is greater than the width of the opening of the sliding groove.

7. A multi-link core-pulling mechanism for sand core forming process as described in claim 1, characterized in that, The diameter of the limiting sleeve is larger than the diameter of the sliding hole, and the outer wall of the limiting sleeve is provided with anti-slip texture.

8. A multi-link core-pulling mechanism for sand core forming process as described in claim 3, characterized in that, The rack slides into the groove, and the length of the slider is greater than the width of the groove.

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