Ceramic core replacement mechanism for precoated sand casting

Abstract

The invention provides a ceramic core replacing mechanism for precoated sand casting, and belongs to the field of precoated sand casting, the ceramic core replacing mechanism comprises a ground frame, the front side and the rear side of the top of the ground frame are each provided with a containing groove, the left side and the right side of each containing groove are each provided with a sliding groove, and a transverse groove is formed in the middle of the top of the ground frame; and the replacing assembly comprises a first lead screw rotationally connected between the inner walls of the left side and the right side of the transverse groove, a moving motor is fixedly connected to one side of the ground frame, and the output end of the moving motor is fixedly connected with the adjacent end of the first lead screw. According to the ceramic core replacement device, through the arranged replacement assembly, ceramic cores in sand shell molds can be fully automatically replaced, when multiple sets of sand shell molds are to be replaced, the molds can be conveyed through the conveyor, large-scale replacement operation of the ceramic cores is achieved in cooperation with the ceramic core replacement device, in the process, the manual labor amount is greatly reduced, and the production efficiency is improved. And the replacement speed and the replacement efficiency are improved.

Description

Technical Field

[0001] The invention relates to the technical field of coated sand casting, in particular to a ceramic core replacement mechanism for coated sand casting. Background Art

[0002] The coated sand shell casting is to mix phenolic resin and hardener with rounded silica sand, and then blow it into the heated metal mold with pressure. Through heating and curing, the coated sand hardens and forms a casting cavity. This process is suitable for the production of large quantities of cast steel and cast iron products, but due to the influence of many factors such as the refractoriness of the coated sand, gas emission, cold shell pouring, etc., casting defects such as pores and pitting are more common. Tests have shown that high-temperature roasted ceramic cores produce less gas during the pouring process, and there is basically no subcutaneous pore defect after the casting is processed. The ceramic core can completely replace the conventional resin sand core to solve the problem of subcutaneous pore defects in castings, and realize the production of coated sand casting steel products by the composite process technology of investment mold and shell mold. After the ceramic core is used for a long time, it needs to be replaced with a new ceramic core.

[0003] The existing replacement method is to manually replace the ceramic core in the sand shell to be replaced. The operator is required to open the sand shell mold one by one, take out the old ceramic core, and then align and put the new ceramic core in. This operation is labor-intensive when there are many sand shell molds to be replaced, resulting in slow replacement speed and low efficiency.

[0004] Therefore, we propose a ceramic core replacement mechanism for coated sand casting to solve the above problems. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a ceramic core replacement mechanism for coated sand casting to solve the problems raised in the above background technology.

[0006] The object of the present invention can be achieved by the following technical solution: comprising a ground frame, the front and rear sides of the top of the ground frame are respectively provided with receiving grooves, the left and right sides of the receiving groove are respectively provided with sliding grooves, and the middle of the top of the ground frame is provided with a transverse groove;

[0007] The replacement component comprises a first screw rod rotatably connected between the inner walls on the left and right sides of the horizontal groove, one side of the ground frame is fixedly connected to a moving motor, the output end of the moving motor is fixedly connected to the adjacent end of the first screw rod, the outer side of the first screw rod is threadedly connected to a vertical frame, the vertical frame is slidably connected in the horizontal groove, a vertical groove is provided in the vertical frame, a second screw rod is rotatably connected between the top and bottom inner walls of the vertical groove, the top of the vertical frame is fixedly connected to a lifting motor, the output end of the lifting motor is fixedly connected to the adjacent end of the second screw rod, the outer side of the second screw rod is threadedly connected to a lifting block, the lifting block is slidably connected to the inner side of the vertical groove, one side of the lifting block is fixedly connected to a horizontal block, a connecting shaft is rotatably connected in the horizontal block, and a fixed connection is provided on the horizontal block A rotating motor is connected, and a gear is fixedly connected to the output end of the rotating motor and one side of the outer side of the connecting shaft, and the two gears are meshed with each other. A group of swing arms are fixedly connected to the two ends of the outer side of the connecting shaft, and each group of swing arms is divided into two symmetrical front and rear arms. The same bracket is rotatably connected between each group of swing arms, and a top plate is fixedly connected between the front and rear sides of the bracket, and an electric cylinder is fixedly connected to the top plate. Moving grooves are respectively provided at the four corners of the bottom of the bracket, and sliding columns are slidably connected in the moving grooves. The bottoms of two adjacent sliding columns are fixedly connected to the same clamping plate, and the output end of the electric cylinder is fixedly connected to a disc, and a connecting rod is fixedly connected between the top ends of the sliding columns, one side of the connecting rod is rotatably connected to a rotating rod, and one end of the rotating rod is rotatably connected to one side of the bottom of an adjacent disc.

[0008] Preferably, a storage component is further included, the storage component includes a receiving tray arranged in the receiving groove, the left and right sides of the receiving tray are respectively fixedly connected with guide feet, and the top of the receiving tray is symmetrically provided with a plurality of placement grooves on the left and right sides.

[0009] Preferably, a pull groove is provided on one side of the accommodating tray, a hand groove is provided on one side of the top of the accommodating tray, and a separation groove is provided in the middle of the top of the accommodating tray.

[0010] Preferably, the four corners of the ground frame are fixedly connected with fixing plates, and adjacent fixing plates are arranged in an eight-shaped shape.

[0011] Preferably, a sand shell is placed on the same plane as the ground frame and close to one side of the bracket, and a ceramic core body is placed symmetrically on the sand shell.

[0012] Preferably, a semicircular groove is provided on one side of the clamping plate, and the radius of the semicircular groove is smaller than the minimum outer diameter of the ceramic core body.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. Through the replacement components, the ceramic core in the sand shell mold can be replaced fully automatically. When multiple sets of sand shell molds are to be replaced, the molds can be transported by the conveyor, and the mechanism can be used to realize the large-scale replacement of the ceramic core. In this process, the manual labor is greatly reduced and the replacement speed and efficiency are improved.

[0015] 2. The replaced ceramic cores can be collected and stored by the storage components to avoid littering. The receiving tray is easy and quick to disassemble, with less operation, which is convenient for replenishing and recycling ceramic cores. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0018] Figure 2 It is a schematic diagram of the three-dimensional structure from another viewing angle of the present invention;

[0019] Figure 3 It is a left-side structural schematic diagram of the present invention;

[0020] Figure 4 yes Figure 1 The enlarged structural diagram at A in the middle;

[0021] Figure 5 yes Figure 3 Enlarged structural diagram at B in the middle.

[0022] In the figure: 1. ground frame; 2. receiving groove; 3. sliding groove; 4. horizontal groove; 5. first screw rod; 6. moving motor; 7. vertical frame; 8. vertical groove; 9. second screw rod; 10. lifting motor; 11. lifting block; 12. horizontal block; 13. connecting shaft; 14. rotating motor; 15. gear; 16. swing arm; 17. bracket; 18. top plate; 19. electric cylinder; 20. moving groove; 21. sliding column; 22. clamping plate; 23. disc; 24. connecting rod; 25. rotating rod; 26. receiving disc; 27. guide support foot; 28. placement groove; 29. ​​drawing groove; 30. hand groove; 31. dividing groove; 32. fixing plate; 33. sand shell; 34. ceramic core body. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] See also Figure 1-Figure 5 As shown, a ceramic core replacement mechanism for coated sand casting includes a base frame 1, a receiving groove 2 is respectively opened on the front and rear sides of the top of the base frame 1, a sliding groove 3 is respectively opened on the left and right sides of the receiving groove 2, a transverse groove 4 is opened in the middle of the top of the base frame 1, the receiving groove 2 is used to place the receiving plate 26, the sliding groove 3 is used to cooperate with the guide support foot 27 to guide the receiving plate 26, and the transverse groove 4 is used to install the first screw rod 5;

[0025] A replacement component, the replacement component includes a first screw rod 5 rotatably connected between the inner walls on the left and right sides of the horizontal groove 4, a moving motor 6 is fixedly connected to one side of the ground frame 1, the output end of the moving motor 6 is fixedly connected to the adjacent end of the first screw rod 5, the outer side of the first screw rod 5 is threadedly connected to a vertical frame 7, the vertical frame 7 is slidably connected in the horizontal groove 4, a vertical groove 8 is provided in the vertical frame 7, a second screw rod 9 is rotatably connected between the top and bottom inner walls of the vertical groove 8, a lifting motor 10 is fixedly connected to the top of the vertical frame 7, the output end of the lifting motor 10 is fixedly connected to the adjacent end of the second screw rod 9, the outer side of the second screw rod 9 is threadedly connected to a lifting block 11, the lifting block 11 is slidably connected to the inner side of the vertical groove 8, a horizontal block 12 is fixedly connected to one side of the lifting block 11, a connecting shaft 13 is rotatably connected in the horizontal block 12, a rotating motor 14 is fixedly connected to the horizontal block 12, and the rotating motor 1 The output end of 4 and the outer side of the connecting shaft 13 are fixedly connected with a gear 15, and the two gears 15 are meshed with each other. A group of swing arms 16 are fixedly connected to the two ends of the outer side of the connecting shaft 13, and each group of swing arms 16 is divided into two symmetrical front and rear groups. The same bracket 17 is rotatably connected between each group of swing arms 16. A top plate 18 is fixedly connected between the front and rear sides of the bracket 17, and an electric cylinder 19 is fixedly connected to the top plate 18. The four corners of the bottom of the bracket 17 are respectively provided with moving grooves 20, and sliding columns 21 are slidably connected in the moving grooves 20. The bottoms of two adjacent sliding columns 21 are fixedly connected with the same clamping plate 22. The output end of the electric cylinder 19 is fixedly connected with a disk 23, and a connecting rod 24 is fixedly connected between the tops of the sliding columns 21. A rotating rod 25 is rotatably connected to one side of the connecting rod 24, and one end of the rotating rod 25 is rotatably connected to one side of the bottom of the adjacent disk 23.

[0026] It should be noted that the cooperation of the mobile motor 6, the first screw rod 5 and the vertical frame 7 can drive the vertical frame 7 to move along the axial direction of the first screw rod 5, so as to adjust the horizontal position of the clamping plate 22. The vertical slot 8 is used to install the second screw rod 9 and guide the lifting block 11 at the same time. The connecting shaft 13 is used to drive the gear 15 to rotate and engage through the rotating motor 14 to drive the swing arms 16 on both sides to flip at the same time. The bracket 17 is rotatably connected between the swing arms 16 to ensure that when the swing arms 16 flip, the bracket 17 always ensures that the clamping plate 22 is vertically downward under the action of gravity. The top plate 18 is used to install the electric cylinder 19, and the mobile slot 20 is used to install the electric cylinder 19. The slide column 21 is used to guide the slide column 21, the clamping plate 22 is used to clamp the ceramic core body 34, and the disc 23 is used to pull the connecting rods 24 on both sides to move through the two rotating rods 25 during lifting and lowering. When the connecting rods 24 move, they will pull the slide columns 21 on both sides to move in the moving groove 20. Through the replacement components set up, the ceramic core in the sand shell mold can be replaced fully automatically. When multiple groups of sand shell molds are to be replaced, the molds can be transported by a conveyor. The mechanism is used to realize large-scale replacement operations of the ceramic core. In this process, the manual labor is greatly reduced, and the replacement speed and efficiency are improved.

[0027] It also includes a storage component, which includes a receiving tray 26 arranged in the receiving groove 2, and the left and right sides of the receiving tray 26 are respectively fixedly connected with guide legs 27, and the top of the receiving tray 26 is symmetrically provided with a plurality of placement grooves 28 on the left and right sides.

[0028] It should be noted that the guide legs 27 are used to guide the movement of the accommodating tray 26 in the accommodating groove 2, and the placement groove 28 is used to place the ceramic core body 34. Through the storage assembly that is set up, the replaced ceramic cores can be collected, stored and uniformly stored to avoid littering, and the accommodating tray 26 is easy and quick to disassemble, with a small amount of operation, which is convenient for replenishing and recycling ceramic cores.

[0029] A pull groove 29 is provided on one side of the accommodating tray 26, a hand groove 30 is provided on one side of the top of the accommodating tray 26, and a separation groove 31 is provided in the middle of the top of the accommodating tray 26. The pull groove 29 and the hand groove 30 are both used to facilitate the pulling of the accommodating tray 26 and facilitate manual operation. The separation groove 31 is used to visually distinguish the old ceramic core body 34 from the new ceramic core body 34 to avoid misplacing.

[0030] The four corners of the ground frame 1 are fixedly connected with fixing plates 32, and adjacent fixing plates 32 are arranged in an eight-shaped shape. The fixing plates 32 are used to connect and fix the accommodating plate 26 to the ground to prevent the accommodating plate 26 from moving when replaced.

[0031] A sand shell 33 is placed on the same plane as the ground frame 1 and on one side close to the bracket 17. A ceramic core body 34 is placed symmetrically on the sand shell 33. At present, there are two common ways to solve the invasive pores of coated sand castings in the industry. One is to hollow out the sand core. During the design, the sand core is hollowed out as much as possible to reduce the weight, and only the outermost thin layer of sand wall is retained. Such a hollow sand core has a relatively low resin content, and the gas generated by pouring and combustion is also reduced accordingly, but the pore defects cannot be fundamentally eliminated. The other is to coat the surface of the sand core with a layer of refractory coating to form an insulating layer. The gas is blocked by the coating layer and is difficult to enter the molten metal prematurely. However, as the heating time increases, the sand core gradually begins to disintegrate, and the coating layer disintegrates due to the loss of strength. Therefore, a part of the delayed gas will still enter the molten metal to form pore defects. At the same time, the coating also increases the production cost. By replacing the original resin core with a ceramic core body 34, the problem of invasive pores caused by resin combustion is solved, the subcutaneous pore defects of the casting are reduced, and the product qualification rate at the core hole position of the coated sand shell casting is improved, thereby realizing a new composite process technology combining the investment mold and the shell mold.

[0032] A semicircular groove is provided on one side of the clamping plate 22, the radius of which is smaller than the minimum outer diameter of the ceramic core body 34. The semicircular groove is used to ensure that the ceramic core body 34 can be clamped and fixed while reducing material usage, thereby reducing manufacturing costs.

[0033] When the present invention is used in practice, the mechanism is first connected to an external power supply. When the opened sand shell 33 moves to one side of the ground frame 1, the lifting motor 10, the rotating motor 14, the electric cylinder 19 and the moving motor 6 are controlled by the controller to work respectively. The lifting motor 10 drives the second screw 9 to rotate, and the threaded cooperation between the lifting block 11 and the second screw 9 drives the cross block 12 to rise to a certain height as a whole. Then, the rotating motor 14 drives the gear 15 to rotate, and the two gears 15 are engaged with each other to drive the connecting shaft 13 and the swing arm 16 to rotate, so that the bracket 17 rotates to the top of the ceramic core body 34 in the sand shell 33. Then, the output end of the lifting motor 10 is reversed, so that the clamping plate 22 under the bracket 17 is close to the ceramic core body 34 in the sand shell 33, and the output end of the electric cylinder 19 drives the disc 23 to move upward, and the connecting rod 24 is pulled to move relatively by the rotating rod 25, and the sliding column 21 is moved in the moving groove 20. The inner guide pulls the two clamping plates 22 to contact each other and squeeze the two sides of the ceramic core body 34 in the sand shell 33. Then the lifting motor 10 works to drive the clamping plates 22 and the bracket 17 to rise to a certain height as a whole. The swing arm 16 is driven by the rotating motor 14 to rotate so that the bracket 17 rotates to a position close to the vertical frame 7. Then the vertical frame 7 is driven to move to a position close to a placement slot 28 as a whole by the moving motor 6. The old ceramic core body 34 clamped by the clamping plate 22 is placed in the placement slot 28 through the cooperation of the lifting motor 10 and the electric cylinder 19. Then the moving motor 6 works to make the clamping plate 22 close to a place in the placement slot 28 where the new ceramic core body 34 is placed. The clamping plate 22 clamps the new ceramic core body 34 and rises to a certain height through the cooperation of the electric cylinder 19 and the lifting motor 10. Then the clamped ceramic core body 34 is placed in the original sand shell 33.

[0034] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A ceramic core replacement mechanism for coated sand casting, characterized in that: include: A floor frame (1), wherein the top of the floor frame (1) is provided with receiving grooves (2) on both sides, respectively, and the left and right sides of the receiving groove (2) are provided with sliding grooves (3), and the top of the floor frame (1) is provided with a transverse groove (4) in the middle; A replacement component, the replacement component comprises a first screw rod (5) rotatably connected between the inner walls on the left and right sides of the horizontal groove (4), a moving motor (6) is fixedly connected to one side of the ground frame (1), the output end of the moving motor (6) is fixedly connected to the adjacent end of the first screw rod (5), the outer side of the first screw rod (5) is threadedly connected to a vertical frame (7), the vertical frame (7) is slidably connected in the horizontal groove (4), a vertical groove (8) is provided in the vertical frame (7), and a second screw rod is rotatably connected between the top and bottom inner walls of the vertical groove (8). The top of the vertical frame (7) is fixedly connected with a lifting motor (10), the output end of the lifting motor (10) is fixedly connected with the adjacent end of the second screw rod (9), the outer side of the second screw rod (9) is threadedly connected with a lifting block (11), the lifting block (11) is slidably connected to the inner side of the vertical slot (8), one side of the lifting block (11) is fixedly connected with a horizontal block (12), a connecting shaft (13) is rotatably connected inside the horizontal block (12), and a rotating motor (14) is fixedly connected to the horizontal block (12). The output end of the rotating motor (14) and one side of the outer side of the connecting shaft (13) are both fixedly connected with a gear (15), and the two gears (15) are meshed with each other. The two ends of the outer side of the connecting shaft (13) are respectively fixedly connected with a group of swing arms (16), and each group of swing arms (16) is divided into two symmetrical front and rear parts. The same bracket (17) is rotatably connected between each group of swing arms (16). A top plate (18) is fixedly connected between the front and rear sides of the bracket (17), and an electric cylinder (19) is fixedly connected to the top plate (18). The frame (17) is provided with movable grooves (20) at four corners of the bottom thereof, wherein a sliding column (21) is slidably connected in the movable groove (20), and the bottoms of two adjacent sliding columns (21) are fixedly connected to a same clamping plate (22), and the output end of the electric cylinder (19) is fixedly connected to a disc (23), and the top ends of the sliding columns (21) are fixedly connected to a connecting rod (24), and one side of the connecting rod (24) is rotatably connected to a rotating rod (25), and one end of the rotating rod (25) is rotatably connected to one side of the bottom of an adjacent disc (23).

2. The ceramic core replacement mechanism for coated sand casting according to claim 1, characterized in that: The storage assembly also includes a storage assembly, which includes a storage tray (26) arranged in the storage groove (2), the left and right sides of the storage tray (26) are respectively fixedly connected with guide legs (27), and the top of the storage tray (26) is symmetrically provided with a plurality of placement grooves (28) on the left and right sides.

3. The ceramic core replacement mechanism for coated sand casting according to claim 2, characterized in that: A pull groove (29) is provided on one side of the accommodating tray (26), a hand groove (30) is provided on one side of the top of the accommodating tray (26), and a separation groove (31) is provided in the middle of the top of the accommodating tray (26).

4. The ceramic core replacement mechanism for coated sand casting according to claim 3, characterized in that: The four corners of the ground frame (1) are fixedly connected with fixing plates (32), and adjacent fixing plates (32) are arranged in an eight-shaped shape.

5. The ceramic core replacement mechanism for coated sand casting according to claim 4, characterized in that: A sand shell (33) is also placed on the same plane as the ground frame (1) and close to the side of the bracket (17), and a ceramic core body (34) is symmetrically placed on the sand shell (33).

6. The ceramic core replacement mechanism for coated sand casting according to claim 5, characterized in that: A semicircular groove is formed on one side of the clamping plate (22), and the radius of the semicircular groove is smaller than the minimum outer diameter of the ceramic core body (34).

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