Apparatus for shakeout after casting
By using a one-way telescopic rod and a hydraulic oil system in the post-casting sand removal device, the problem of loss of clamping force caused by the gap between the pressure plate and the casting was solved, achieving stable clamping of the casting during vibration and efficient sand removal, thus improving sand removal efficiency and casting quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- WENZHOU KAICHENG MACHINERY
- Filing Date
- 2026-06-18
- Publication Date
- 2026-07-21
AI Technical Summary
In existing vibration-induced sand removal methods, the gap between the pressure plate and the casting leads to the loss of clamping force. The casting is prone to jumping and displacement during vibration, which affects the protection and separation efficiency of the casting.
A sand removal device is adopted after casting. It uses a one-way telescopic rod and hydraulic oil system to maintain the clamping force through the cooperation of spring piston rod and pressure plate to ensure the stable clamping of the casting in the vertical direction. Combined with vibration mechanism and overturning mechanism, it accelerates the shedding of molding sand.
It effectively maintains the clamping force of the casting during vibration, prevents jumping and displacement, improves sand removal efficiency and casting surface quality, and reduces collision damage.
Smart Images
Figure CN122425189A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of metal casting technology, specifically a sand removal treatment device after casting. Background Technology
[0002] In casting production, after the casting solidifies and cools, the molding sand adhering to the surface of the casting needs to be separated from the casting to obtain a clean casting blank. Sand removal is the first step in subsequent casting processing, and its separation efficiency and the surface quality of the casting directly affect the subsequent machining allowance, machining time, and the final product qualification rate.
[0003] Shaking is generally done by vibration. The high-frequency vibration of the sand-shaking grid is driven by a vibration motor or eccentric mechanism, which throws and impacts the casting and molding sand together, causing the molding sand to fall off the surface of the casting under the impact force.
[0004] For example, the invention with publication number CN118751905B belongs to the technical field of metal casting and relates to a sand removal device after sand casting. During the sand removal process, the workpiece can be pressed down by a pressure plate to prevent the workpiece from shifting. Then, vibration sand removal is performed. During vibration, the workpiece is fixed to prevent the workpiece from rubbing against each other, thereby protecting the workpiece and ensuring the yield rate of the workpiece.
[0005] While the above-mentioned solution can hold the workpiece in place by using a pressure plate to prevent subsequent positional displacement during vibration, the fixed height of the pressure plate means that as molding sand falls off the casting surface, a gap gradually forms between the pressure plate and the casting. This causes the pressure plate to lose its clamping force, and the casting, under vibration, will again bounce and shift, potentially colliding with surrounding castings or grids. Therefore, based on these problems, a sand removal device after casting is proposed. Summary of the Invention
[0006] To address the problems mentioned in the background art, the present invention provides a sand removal treatment device after casting, which solves the problem that when molding sand falls off the surface of the casting, a gap gradually forms between the pressure plate and the casting, resulting in the loss of the pressure plate's clamping force on the casting.
[0007] To achieve the above objectives, the present invention provides the following technical solution: a sand removal treatment device after casting, including a vibration mechanism, and further including: a sand removal frame installed on the vibration mechanism, wherein one-way telescopic rods are installed at the four corners of the sand removal frame, a pressure plate for sealing the top of the sand removal frame is installed at the top of the one-way telescopic rod, and a connecting component for installing the pressure plate on the top of the one-way telescopic rod is provided on the one-way telescopic rod; The one-way telescopic rod includes a sleeve fixedly installed on the sand-falling frame and containing hydraulic oil. A spring piston rod is movably sleeved inside the sleeve. The spring piston rod has an upward tendency in the initial state due to its own elastic force. The piston end of the spring piston rod is located in the sleeve, and the parts above and below the piston end of the spring piston rod are the upper piston chamber and the lower piston chamber, respectively. An expansion hole is opened at the bottom end of the spring piston rod. The diameter of the expansion hole gradually increases from the inside to the outside. A spring core ball is installed at the bottom of the spring piston rod inside the expansion hole. It can move towards the inner end of the expansion hole due to its own elastic force and block it. Initially, the lower chamber of the piston can communicate unidirectionally with the upper chamber of the piston through the bottom of the spring piston rod and the expansion hole; The spring piston rod is equipped with a push rod that can push the spring core ball outward when it moves upward.
[0008] Preferably, the sand-falling frame is provided with two sets of forward baffles and side baffles in a symmetrical direction, and the pressure plate is provided with a limiting groove one and a limiting groove two, which can be fitted onto the outside of the forward baffles and the side baffles, respectively.
[0009] Preferably, the vibration mechanism includes a support platform and a funnel component. Several sets of support springs are fixedly connected to the top of the support platform. The top of the support springs is fixedly connected to the funnel component. A gap is left between the outer periphery of the funnel component and the cavity of the support platform. Vibration motors are fixedly connected to both sides of the funnel component.
[0010] Preferably, each of the positive baffles is fixedly connected to a rotating shaft, which is rotatably mounted inside the funnel component; the funnel component is equipped with a flipping mechanism for driving the rotating shaft to rotate or locking it.
[0011] Preferably, the flipping mechanism includes a drive motor fixedly mounted on the funnel component, the output shaft end of the drive motor is provided with a worm, and one of the rotating shafts located outside the funnel component is fixedly fitted with a worm wheel, the worm and the worm wheel being meshed and connected.
[0012] Preferably, the diameter of the upper part of the sleeve cavity is smaller than the diameter of the piston end of the spring piston rod, and when the bottom end of the spring piston rod is at its highest point, the expansion hole is located in the upper cavity of the piston.
[0013] Preferably, the top end of the spring piston rod is provided with a support step; the connecting assembly includes a pin and a locking hole opened at the top end of the spring piston rod, the pressure plate is provided with a through hole located directly above the spring piston rod, and the pressure plate is provided with a mounting hole that can communicate with the through hole; The through hole can be fitted onto the top of the sleeve, and the pin can be inserted into the mounting hole and the locking pin hole.
[0014] Preferably, the top end of the spring piston rod is made of a magnetic metal material, and the end of the pin is a magnet that can be attracted to the spring piston rod.
[0015] Preferably, the push rod includes a tension spring push rod that is vertically and movably installed in the spring piston rod. There is a gap between the bottom end of the tension spring push rod and the inner wall of the spring piston rod, and the bottom end of the tension spring push rod is provided with a slope, which overlaps with the expansion hole in the vertical direction. The top of the tension spring rod is hemispherical, and the hemispherical part can extend upward into the locking pin hole. At this time, the slope is in a state of compression and expansion of the hole due to its own elastic force. When the pin is inserted into the locking pin hole, it can compress the top of the tension spring rod and make it move downward.
[0016] Preferably, a grid frame is vertically and movably installed at the bottom of the sand-falling frame. The grid frame has several sets of limiting recesses, which fit against the outer periphery of the sleeve. The grid portion on the grid frame is staggered with the grid at the bottom of the sand-falling frame. The top diameter of the outer periphery of the sleeve is larger than its lower diameter.
[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: The above solution involves placing the workpiece in a sand-falling frame, covering the sand-falling frame with a pressure plate, and connecting the top of the sand-falling frame to the sleeve via a connecting assembly. When the vibration mechanism operates, the molding sand on the workpiece will fall off. At this time, the pressure plate, under the vibration of the sand-falling frame and its own weight, will move downward synchronously with the spring piston rod. The hydraulic oil in the lower chamber of the piston will push the spring core ball to open and enter the upper chamber of the piston in one direction through the expansion hole. At this time, the length of the sleeve and the spring piston rod will decrease, and the spring piston rod cannot move upward. The pressure plate can continue to exert a clamping force on the casting in the vertical direction.
[0018] In the above solution, when installing the pressure plate, the through hole is fitted onto the top of the spring piston rod, and the pin is inserted into the locking pin hole. At this time, the end of the pin will squeeze the tension spring rod and make it move downward. At this time, the slope will release the compression of the expansion hole, and the hydraulic oil in the upper chamber of the piston cannot enter the lower chamber of the piston through the expansion hole. Similarly, when the pin is removed from the locking pin hole, the tension spring rod will move upward under its own elastic force, and the slope will squeeze the spring core ball to move outward. At this time, the lower chamber of the piston will be connected to the upper chamber of the piston through the expansion hole. When the pressure plate is removed, the spring piston rod will move upward and reset under its own elastic force, so as to facilitate the operator's next use. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a side perspective view of the present invention; Figure 3 This is a schematic diagram of the structure of the sand-falling frame of the present invention; Figure 4 This is a schematic diagram of the structure of the pressure plate component of the present invention; Figure 5 This is a top view schematic diagram of the sand-falling frame structure of the present invention; Figure 6 This is a top view schematic diagram of the pressure plate component of the present invention; Figure 7 This is a frontal planar sectional view of the unidirectional telescopic rod of the present invention; Figure 8 for Figure 7 Enlarged view of point A in the middle; Figure 9 for Figure 8 Enlarged view of point B in the middle; Figure 10 This is a schematic diagram of the structure of the connecting component of the present invention.
[0020] In the diagram: 1. Vibration mechanism; 11. Support platform; 12. Funnel component; 13. Support spring; 14. Vibration motor; 2. Tilting mechanism; 21. Worm gear; 22. Drive motor; 23. Worm; 3. Sand-falling frame; 31. Rotating shaft; 32. Forward baffle; 33. Lateral baffle; 4. One-way telescopic rod; 41. Sleeve component; 42. Spring piston rod; 43. Upper piston chamber; 44. Lower piston chamber; 45. Spring core ball; 46. Expansion hole; 5. Pressure plate component; 51. Limiting groove one; 52. Limiting groove two; 6. Grid frame; 61. Limiting notch; 7. Top rod component; 71. Tension spring top rod; 72. Slope; 8. Connecting assembly; 81. Locking pin hole; 82. Mounting hole; 83. Through hole; 84. Pin. Detailed Implementation
[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0022] like Figures 1 to 10 As shown, the present invention provides a sand removal treatment device after casting, including a vibration mechanism 1, and further including: a sand removal frame 3 installed on the vibration mechanism 1, a one-way telescopic rod 4 installed at the four corners of the sand removal frame 3, a pressure plate 5 for sealing the top of the sand removal frame 3 installed at the top of the one-way telescopic rod 4, and a connecting component 8 for installing the pressure plate 5 on the top of the one-way telescopic rod 4. The one-way telescopic rod 4 includes a sleeve 41 fixedly installed on the sand-falling frame 3 and containing hydraulic oil. A spring piston rod 42 is movably sleeved inside the sleeve 41. The spring piston rod 42 has an upward tendency in the initial state due to its own elastic force. The piston end of the spring piston rod 42 is located in the sleeve 41, and the parts above and below the piston end of the spring piston rod 42 are the upper piston chamber 43 and the lower piston chamber 44, respectively. An expansion hole 46 is opened at the bottom end of the spring piston rod 42. The diameter of the expansion hole 46 gradually increases from the inside to the outside. A spring core ball 45 is installed at the bottom of the spring piston rod 42 inside the expansion hole 46. It can move towards the inner end of the expansion hole 46 due to its own elastic force and block it. Initially, the lower piston chamber 44 can be unidirectionally connected to the upper piston chamber 43 through the bottom of the spring piston rod 42 and the expansion hole 46. A push rod 7 is installed on the spring piston rod 42, which can push the spring core ball 45 outward when it moves upward.
[0023] Using the above scheme, the workpiece is placed in the sand-dropping frame 3, and the pressure plate 5 is placed on top of the sand-dropping frame 3. At the same time, the sand-dropping frame 3 is connected to the top of the sleeve 41 through the connecting assembly 8. When the vibration mechanism 1 is running, the molding sand on the workpiece will fall off. At this time, the pressure plate 5 will be vibrated on the sand-dropping frame 3 and its own weight will move down synchronously with the spring piston rod 42. At this time, the hydraulic oil in the lower chamber 44 of the piston will push the spring core ball 45 to open and enter the upper chamber 43 of the piston in one direction through the expansion hole 46. At this time, the length of the sleeve 41 and the spring piston rod 42 will be reduced, and the spring piston rod 42 cannot move up. The pressure plate 5 can continue to exert a clamping force on the casting in the vertical direction.
[0024] like Figures 1-7 As shown, two sets of forward baffles 32 and side baffles 33 are symmetrically arranged on the sand-falling frame 3. The pressure plate 5 has a limiting groove 1 51 and a limiting groove 2 52, which can be fitted onto the outside of the forward baffles 32 and the side baffles 33 respectively. The vibration mechanism 1 includes a support platform 11 and a funnel component 12. Several sets of support springs 13 are fixedly connected to the top of the support platform 11. The top of the support springs 13 is fixedly connected to the funnel component 12. A gap is left between the outer periphery of the funnel component 12 and the cavity of the support platform 11. Vibration motors 14 are fixedly connected to both sides of the funnel component 12. Each set of positive baffles 32 is fixedly connected to a rotating shaft 31, which is rotatably installed inside the funnel component 12; the funnel component 12 is equipped with a flipping mechanism 2 for driving the rotating shaft 31 to rotate or locking. The flipping mechanism 2 includes a drive motor 22 fixedly mounted on the funnel part 12. The output shaft end of the drive motor 22 is provided with a worm 23. One of the rotating shafts 31 located outside the funnel part 12 is fixedly sleeved with a worm wheel 21. The worm 23 is meshed with the worm wheel 21. Using the above scheme, the drive motor 22 causes the worm 23 to drive the worm wheel 21 to rotate, which in turn drives the sand-falling frame 3 to flip through the rotating shaft 31. Then, the vibration motor 14 is run to make the funnel part 12 vibrate, which can accelerate the falling of molding sand at the bottom of the sand-falling frame 3.
[0025] like Figure 8 and Figure 9 As shown, the diameter of the upper part of the sleeve 41 cavity is smaller than the diameter of the piston end of the spring piston rod 42. When the bottom end of the spring piston rod 42 is at the top, the expansion hole 46 is located in the upper chamber 43 of the piston. By adopting the above solution, the internal cavity of the sleeve 41 can be designed to prevent the inner wall of the sleeve 41 from blocking the expansion hole 46 when the spring piston rod 42 is at its highest position.
[0026] like Figure 8 and Figure 9 As shown, the top end of the spring piston rod 42 is provided with a support step; the connecting assembly 8 includes a pin 84 and a locking hole 81 opened at the top end of the spring piston rod 42, the pressure plate 5 is provided with a through hole 83 located directly above the spring piston rod 42, and the pressure plate 5 is provided with a mounting hole 82 that can communicate with the through hole 83. The through hole 83 can be fitted onto the top of the sleeve 41, and the pin 84 can be inserted into the mounting hole 82 and the locking pin hole 81; The top end of the spring piston rod 42 is made of magnetic metal material, and the end of the pin 84 is a magnet that can be attracted to the spring piston rod 42. The push rod 7 includes a tension spring push rod 71 that is vertically and movably installed in the spring piston rod 42. There is a gap between the bottom end of the tension spring push rod 71 and the inner wall of the spring piston rod 42, and the bottom end of the tension spring push rod 71 is provided with a slope 72. The slope 72 overlaps with the expansion hole 46 in the vertical direction. The top of the tension spring rod 71 is hemispherical, and the hemispherical part can extend upward into the locking pin hole 81. At this time, the slope 72 is in a state of squeezing the expansion hole 46 by its own elastic force. When the pin 84 is inserted into the locking pin hole 81, it can squeeze the top of the tension spring rod 71 and make it move downward. Using the above scheme, when installing the pressure plate 5, the through hole 83 is fitted onto the top of the spring piston rod 42, and the pin 84 is inserted into the locking pin hole 81. At this time, the end of the pin 84 will squeeze the tension spring top rod 71 and make it move downward. At this time, the slope 72 will release the compression on the expansion hole 46, and the hydraulic oil in the upper chamber 43 of the piston cannot enter the lower chamber 44 of the piston through the expansion hole 46. Similarly, when the pin 84 is removed from the locking pin hole 81, the tension spring top rod 71 will move upward under its own elastic force, and the slope 72 will squeeze the spring core ball 45 to move outward. At this time, the lower chamber 44 of the piston will be connected to the upper chamber 43 of the piston through the expansion hole 46. When the pressure plate 5 is removed, the spring piston rod 42 will move upward and reset under its own elastic force, so as to facilitate the operator's next use.
[0027] like Figures 3-5 , Figure 7 , Figure 8 and Figure 10 As shown, a grid frame 6 is vertically and movably installed at the bottom of the sand-falling frame 3. Several sets of limiting recesses 61 are opened on the grid frame 6. The limiting recesses 61 fit with the outer periphery of the sleeve 41. The grid part on the grid frame 6 is arranged alternately with the grid at the bottom of the sand-falling frame 3. The top diameter of the outer periphery of the sleeve 41 is larger than the bottom diameter. Using the above scheme, the drive motor 22 drives the worm gear 23 to rotate the worm wheel 21, which in turn drives the sand-falling frame 3 to flip through the rotating shaft 31. Then, the vibration motor 14 is run to make the funnel part 12 vibrate. During the vibration, the grid frame 6 will also move downward and be misaligned with the grid of the sand-falling frame 3 in the vertical direction, which facilitates the falling off of large pieces of molding sand and also prevents the molding sand from getting stuck in the grid at the bottom of the sand-falling frame 3.
[0028] Working principle and usage process of this invention: In use, the operator places the workpiece into the sand-dropping frame 3, and covers the sand-dropping frame 3 with the pressure plate 5. At the same time, the sand-dropping frame 3 is connected to the top of the sleeve 41 through the connecting assembly 8. When the vibration mechanism 1 operates, the molding sand on the workpiece will fall off. At this time, the pressure plate 5 will be vibrated on the sand-dropping frame 3 and its own weight will move down synchronously with the spring piston rod 42. At this time, the hydraulic oil in the lower chamber 44 of the piston will push the spring core ball 45 to open and enter the upper chamber 43 of the piston in one direction through the expansion hole 46. At this time, the length of the sleeve 41 and the spring piston rod 42 will be reduced, and the spring piston rod 42 cannot move up. The pressure plate 5 can continue to exert a clamping force on the casting in the vertical direction.
[0029] When installing the pressure plate 5, the operator places the through hole 83 on the top of the spring piston rod 42 and inserts the pin 84 into the locking pin hole 81. At this time, the end of the pin 84 will squeeze the tension spring top rod 71 and make it move downward. At this time, the slope 72 will release the compression on the expansion hole 46, and the hydraulic oil in the upper chamber 43 of the piston cannot enter the lower chamber 44 of the piston through the expansion hole 46. Similarly, when the pin 84 is removed from the locking pin hole 81, the tension spring top rod 71 will move upward due to its own elastic force, and the slope 72 will squeeze the spring core ball 45 to move outward. At this time, the lower chamber 44 of the piston will be connected to the upper chamber 43 of the piston through the expansion hole 46. When the pressure plate 5 is removed, the spring piston rod 42 will move upward and reset due to its own elastic force, so that it can be used by the operator next time. After the workpiece is removed, in order to prevent large pieces of molding sand from getting stuck at the bottom of the sand drop frame 3, the operator runs the drive motor 22 to make the worm gear 23 drive the worm wheel 21 to rotate, which in turn drives the sand drop frame 3 to flip through the rotating shaft 31. Then, the vibration motor 14 is run to make the funnel part 12 vibrate. During the vibration, the grid frame 6 will also move downward and be misaligned with the grid of the sand drop frame 3 in the vertical direction, which facilitates the falling off of large pieces of molding sand and also prevents the molding sand from getting stuck in the grid at the bottom of the sand drop frame 3.
[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A sand removal treatment device after casting, comprising a vibration mechanism (1), characterized in that, Also includes: A sand-falling frame (3) is installed on the vibration mechanism (1). One-way telescopic rods (4) are installed at the four corners of the sand-falling frame (3). A pressure plate (5) for sealing the top of the sand-falling frame (3) is installed at the top of the one-way telescopic rod (4). A connecting component (8) for installing the pressure plate (5) on the top of the one-way telescopic rod (4) is provided on the one-way telescopic rod (4). The one-way telescopic rod (4) includes a sleeve (41) fixedly installed on the sand-falling frame (3) and containing hydraulic oil. A spring piston rod (42) is movably sleeved inside the sleeve (41). The spring piston rod (42) has an upward tendency in the initial state due to its own elastic force. The piston end of the spring piston rod (42) is located in the sleeve (41), and the parts above and below the piston end of the spring piston rod (42) are the upper piston chamber (43) and the lower piston chamber (44), respectively. An expansion hole (46) is opened at the bottom end of the spring piston rod (42). The diameter of the expansion hole (46) gradually increases from the inside to the outside. A spring core ball (45) is installed at the bottom of the spring piston rod (42) inside the expansion hole (46) and can move towards the inner end of the expansion hole (46) due to its own elastic force and seal it. Initially, the lower chamber (44) of the piston can be unidirectionally connected to the upper chamber (43) of the piston through the bottom of the spring piston rod (42) and the expansion hole (46); The spring piston rod (42) is equipped with a push rod (7) that can push the spring core ball (45) outward when it moves upward.
2. The sand removal treatment device after casting as described in claim 1, characterized in that: The sand-falling frame (3) is provided with two sets of forward baffles (32) and side baffles (33) in a symmetrical direction. The pressure plate (5) is provided with a limiting groove one (51) and a limiting groove two (52). The limiting groove one (51) and the limiting groove two (52) can be fitted onto the outside of the forward baffles (32) and the side baffles (33), respectively.
3. The sand removal treatment device after casting as described in claim 2, characterized in that: The vibration mechanism (1) includes a support platform (11) and a funnel (12). Several sets of support springs (13) are fixedly connected to the top of the support platform (11). The top of the support springs (13) is fixedly connected to the funnel (12). There is a gap between the outer periphery of the funnel (12) and the cavity of the support platform (11). Vibration motors (14) are fixedly connected to both sides of the funnel (12).
4. The sand removal treatment device after casting as described in claim 3, characterized in that: Each of the positive baffles (32) is fixedly connected to a rotating shaft (31), which is rotatably installed inside the funnel component (12); The funnel component (12) is equipped with a flipping mechanism (2) for driving the rotating shaft (31) to rotate or lock.
5. The sand removal treatment device after casting as described in claim 4, characterized in that: The flipping mechanism (2) includes a drive motor (22) fixedly installed on the funnel part (12). The output shaft end of the drive motor (22) is provided with a worm (23). One of the rotating shafts (31) is fixedly sleeved with a worm wheel (21) at one end outside the funnel part (12). The worm (23) and the worm wheel (21) are meshed and connected.
6. The sand removal treatment device after casting as described in claim 1, characterized in that: The diameter of the upper part of the sleeve (41) cavity is smaller than the diameter of the piston end of the spring piston rod (42). When the bottom end of the spring piston rod (42) is at the top, the expansion hole (46) is located in the upper chamber (43) of the piston.
7. The sand removal treatment device after casting as described in claim 1, characterized in that: The top end of the spring piston rod (42) is provided with a support step; The connecting assembly (8) includes a pin (84) and a locking hole (81) opened at the top of the spring piston rod (42). The pressure plate (5) has a through hole (83) located directly above the spring piston rod (42). The pressure plate (5) has a mounting hole (82) that can communicate with the through hole (83). The through hole (83) can be fitted onto the top of the sleeve (41), and the pin (84) can be inserted into the mounting hole (82) and the locking pin hole (81).
8. The sand removal treatment device after casting as described in claim 7, characterized in that: The top end of the spring piston rod (42) is made of magnetic metal material, and the end of the pin (84) is a magnet and can be attracted to the spring piston rod (42).
9. The sand removal treatment device after casting as described in claim 8, characterized in that: The top rod (7) includes a tension spring top rod (71) that is vertically movably installed in the spring piston rod (42). There is a gap between the bottom end of the tension spring top rod (71) and the inner wall of the spring piston rod (42), and the bottom end of the tension spring top rod (71) is provided with a slope (72). The slope (72) overlaps with the expansion hole (46) in the vertical direction. The top of the tension spring rod (71) is hemispherical, and the hemispherical part can extend upward into the locking pin hole (81). At this time, the slope (72) is in the state of squeezing the expansion hole (46) by its own elastic force. When the pin (84) is inserted into the locking pin hole (81), it can squeeze the top of the tension spring rod (71) and make it move downward.
10. The sand removal treatment device after casting as described in claim 5, characterized in that: A grid frame (6) is vertically and movably installed at the bottom of the sand-falling frame (3). Several sets of limiting recesses (61) are provided on the grid frame (6). The limiting recesses (61) are fitted to the outer periphery of the sleeve (41). The grid part on the grid frame (6) is staggered with the grid at the bottom of the sand-falling frame (3). The top diameter of the outer periphery of the sleeve (41) is larger than the diameter of its lower part.