A core handling system

Abstract

The application discloses a core taking and lowering system for transporting sand cores, which comprises a frame device, a buffer device and a clamping jaw device. The frame device comprises an upper frame and a lower frame, and a guide rod is arranged on the lower frame and penetrates through the upper frame and is in sliding connection with the upper frame. A limiting mechanism is arranged on the frame device to limit the relative sliding of the upper frame and the lower frame. The buffer device is configured to buffer the sliding between the upper frame and the lower frame. The clamping jaw device comprises a fixing frame, a rotating shaft, a clamping jaw and a driving mechanism for driving the rotating shaft to rotate. The fixing frame is connected with the frame device, and the rotating shaft and the clamping jaw are in rotating connection with the fixing frame respectively. A cam shaft for driving the clamping jaw to rotate back and forth is arranged on the rotating shaft and is in sliding connection with the end of the clamping jaw. The application avoids the collision of the sand cores during the core taking and lowering, avoids the generation of floating sand and reduces the scrap of the castings caused by the sand inclusion.

Description

Technical Field

[0001] This invention belongs to the field of mold technology and relates to a core-lowering system for transporting sand cores. Background Technology

[0002] For hollow castings, sand cores are generally used for internal molding. Core setting is an essential step in the early stages of casting. In general molding line production, core setting is completed by a combination of manual and mechanical cranes. During core setting, molding is usually stopped. After core setting is completed, the process moves to the next step. However, for larger and heavier sand cores, the core setting process faces many uncontrollable factors. For example, the sand core is heavy and has great inertia when being lifted and placed. During this process, the sand core itself is easily damaged and may also damage the sand mold on the molding line. Floating sand is also easily generated during core setting, affecting the yield of the casting. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a core-dropping system for transporting sand cores, which avoids collisions between sand cores during core extraction and core dropping, prevents the generation of floating sand, and reduces the scrap of castings caused by sand inclusions.

[0004] To achieve the above objectives, the present invention is implemented using the following technical solution: A core-lifting system for transporting sand cores, comprising: A frame device, comprising an upper frame and a lower frame, wherein a guide rod is provided on the lower frame, the guide rod passing through the upper frame and slidably connected to the upper frame; the frame device is provided with a limiting mechanism for restricting the relative sliding of the upper frame and the lower frame; A buffer device is configured to cushion the sliding between the upper frame and the lower frame. A gripper device includes a fixed frame, a rotating shaft, grippers, and a drive mechanism for driving the rotating shaft to rotate. The fixed frame is connected to the frame device. The rotating shaft and the grippers are rotatably connected to the fixed frame. A camshaft for driving the grippers to reciprocate is sleeved on the rotating shaft. The camshaft is slidably connected to the end of the grippers.

[0005] Optionally, the limiting mechanism includes a fixed rod and a connecting rod. The fixed rod is connected to the upper frame, and the side wall of the connecting rod is rotatably connected to the upper frame. The side walls of the guide rod and the fixed rod are respectively provided with waist-shaped holes, and the two ends of the connecting rod are slidably connected to the fixed rod and the guide rod through the waist-shaped holes.

[0006] Optionally, the lower frame is provided with a linkage rod for supporting and protecting the connecting rod, the linkage rod passing through the upper frame and slidably connected to the upper frame.

[0007] Optionally, the buffer device includes a nitrogen spring, the cylinder of which is connected to the upper frame, and the plunger rod of which is connected to the lower frame.

[0008] Optionally, the lower frame is provided with positioning guide posts for positioning the frame device and the core assembly tooling.

[0009] Optionally, the gripper is provided with a return spring and a spring mounting hole. The return spring is located on the side of the gripper's rotating shaft. One end of the return spring is connected to the gripper head, and the other end of the return spring is slidably connected to the outer wall of the camshaft.

[0010] Optionally, the drive mechanism includes a cylinder and a power crank arm. The cylinder body is connected to the fixed frame, one end of the power crank arm is connected to the side wall of the rotating shaft, and the other end of the power crank arm is hinged to the piston rod of the cylinder.

[0011] Optionally, the rotating shaft includes a driving shaft and a driven shaft. The driving shaft is located on one side of the fixed frame, and the driven shaft is located on the other side of the fixed frame. A transmission rod is provided between the driving shaft and the driven shaft. A hinge rod is provided on the driving shaft and the driven shaft respectively. One end of the hinge rod is connected to the driving shaft and the driven shaft respectively, and the other end of the hinge rod is hinged to the transmission rod.

[0012] Optionally, the fixing frame is provided with sand core clamping plates on both sides adjacent to the clamping claw for limiting the sand core.

[0013] Optionally, the lower frame is provided with a sensing rod for monitoring the relative displacement between the upper frame and the lower frame.

[0014] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: This invention provides a core-carrying system for transporting sand cores. The guide rod facilitates stable relative movement between the upper and lower frames, the limiting mechanism limits the relative sliding of the upper and lower frames, the upper frame facilitates the installation of the gripper device, the buffer device buffers the sliding between the upper and lower frames and the contact between the lower frame and the sand frame, the gripper device facilitates the gripping of the sand core, and the camshaft facilitates the opening and closing of the gripper. This invention can complete automatic or semi-automatic core setting; it has relatively flexible operating conditions and a wide range of application scenarios; buffer actions are set in the core picking and setting processes to avoid tooling damage to the sand core and sand core damage to the model; a positioning device is used during core picking and setting, and core setting can be completed even when the molding line is working continuously, which can improve work efficiency; precise positioning during core picking and setting avoids unnecessary collisions of the sand core during core picking and setting, avoids the generation of loose sand, and reduces the scrap of castings caused by sand inclusions. Attached Figure Description

[0015] Figure 1 The diagram shown is a schematic diagram of a core-lowering system for transporting sand cores according to an embodiment of the present invention; Figure 2 The diagram shown is a schematic diagram of a core-carrying system gripper device for transporting sand cores according to an embodiment of the present invention. Figure 3 As shown Figure 2 A magnified view of a portion of the image; Figure 4 The image shown is a side view of a core-carrying system gripper device for transporting sand cores according to an embodiment of the present invention.

[0016] In the diagram: 1. Upper frame; 2. Lower frame; 3. Direct-acting round-head valve; 4. Sensing rod; 5. Connecting rod; 6. Linkage rod; 7. Nitrogen spring; 8. Positioning guide post; 9. Guide rod; 10. Cylinder; 11. Fixing frame; 12. Drive shaft; 13. Driven shaft; 14. Gripper; 15. Camshaft; 16. Power crank arm; 17. Transmission rod; 18. Hinge rod; 19. Sand core clamping plate; 20. Sand core; 21. Pressure indicator; 22. Air source treatment device; 23. Front panel valve; 24. Pneumatic control valve; 25. Delay valve; 26. Wear-resistant block; 27. Return spring; 28. Fixing rod; 29. ​​Gripper head. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0018] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0019] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances. Example 1

[0020] like Figures 1 to 4 As shown, a core-lowering system for transporting sand cores includes: The frame device includes an upper frame 1 and a lower frame 2. Four guide rods 9 are vertically arranged on the lower frame 2, passing through the upper frame 1 and slidably connected to it. The upper frame 1 is the main structure supporting the lifting of the sand core, while the lower frame 2 serves as a positioning and buffer during core removal. The frame device is equipped with a limiting mechanism 5 to restrict the relative sliding of the upper frame 1 and the lower frame 2. The limiting mechanism includes a fixed rod 28 and a connecting rod 5 arranged vertically. The upper end of the fixed rod 28 is fixedly connected to the upper frame 1, and the middle section of the connecting rod 5 is rotatably connected to the upper frame 1. The side walls of the guide rods 9 and the fixed rod 28 are respectively provided with horizontally arranged oblong holes. The two ends of the connecting rod 5 are slidably connected to the fixed rod 28 and the guide rods 9 through the oblong holes. The connecting rod 5 serves as a moving connection between the upper frame 1 and the lower frame 2. A buffer device is configured to buffer the sliding between the upper frame and the lower frame; the buffer device is a nitrogen spring 7 arranged vertically, the cylinder of the nitrogen spring 7 is connected to the upper frame 1, and the plunger rod of the nitrogen spring 7 is connected to the lower frame 2; the nitrogen spring 7 serves to buffer the upper frame 1 when it presses down on the lower frame 2, and also to slow down the downward speed when the frame device approaches the sand core, so as to avoid impact damage to the sand core. The gripper device includes a fixed frame 11, a horizontally arranged rotating shaft, grippers 14, and a drive mechanism for driving the rotating shaft to rotate. The fixed frame 11 is fixedly connected to the upper frame 1. The middle section of the rotating shaft and the middle section of the grippers 14 are rotatably connected to the fixed frame 11. The rotating shaft is located on the side of the grippers 14. A camshaft 15 for driving the grippers 14 to reciprocate is fixedly sleeved on the rotating shaft. The camshaft 15 is slidably connected to the end of the grippers 14. The gripper head 29 of the grippers 14 is used to grip the side groove of the sand core 20. The drive mechanism includes a cylinder 10 arranged vertically and a power crank arm 16. One end of the power crank arm 16 is fixedly sleeved to the side wall of the rotating shaft, and the other end of the power crank arm 16 is hinged to the piston rod of the cylinder 10. The gripper head 29 is the part that directly connects to the sand core 20. The camshaft 15 converts the rotation of the rotating shaft into the opening and closing motion of the grippers 14. Example 2

[0021] like Figures 1 to 4 As shown, based on Embodiment 1, in this embodiment, the lower frame 2 is provided with a linkage rod 6 for supporting and protecting the connecting rod 5 along the vertical direction. The lower end of the linkage rod 6 is connected to the lower frame 2, and the linkage rod 6 passes through the upper frame 1 and is slidably connected to the upper frame 1. The upper end of the linkage rod 6 is located below the end of the connecting rod 5 near the guide rod.

[0022] The lower frame 2 is provided with a positioning guide post 8 along the vertical direction for positioning the lower frame 2 and the core assembly tooling. The upper end of the positioning guide post 8 is connected to the lower frame 2.

[0023] The gripper 14 is provided with a return spring 27 and a spring mounting hole. The return spring 27 is located on the side of the rotating shaft of the gripper 14. One end of the return spring 27 is connected to the gripper head 29, and the other end of the return spring 27 is slidably connected to the outer wall of the camshaft 15. The rotating shaft of the gripper 14 is the rotation center of the gripper 14. Under the rotation of the camshaft 15, the return spring 27 can make the gripper head 29 rotate.

[0024] The end of the gripper 14 that slides with the camshaft 15 is provided with a wear-resistant block 26. The camshaft 15 is slidably connected to the wear-resistant block 26, and the wear-resistant block 26 improves the service life of the gripper 14.

[0025] The rotating shaft includes a driving shaft 12 and a driven shaft 13 arranged in parallel. The driving shaft 12 is located on one side of the fixed frame 11, and the driven shaft 13 is located on the other side of the fixed frame 11. A transmission rod 17 is provided between the driving shaft 12 and the driven shaft 13. A hinge rod 18 is provided on the driving shaft 12 and the driven shaft 13 respectively. One end of the hinge rod 18 is fixedly connected to the driving shaft 12 and the driven shaft 13 respectively, and the other end of the hinge rod 18 is hinged to the end of the transmission rod 17 respectively. Through the hinge rod 18 and the transmission rod 17, the driving shaft 12 transmits power to the driven shaft 13.

[0026] The fixing frame 11 is provided with sand core clamping plates 19 on both sides of the adjacent gripper 14 for limiting the sand core 20.

[0027] The lower frame 2 is equipped with a sensing rod 4 for monitoring the relative displacement between the upper frame 1 and the lower frame 2. The upper frame 1 is equipped with a direct-acting round-head valve 3 for signal transmission and reception during pneumatic operation conversion. The sensing rod 4 is used to provide signals to the direct-acting round-head valve 3 during mechanical operation.

[0028] The upper frame 1 is equipped with a pressure indicator 21 for pressure display and a front panel valve 23 for manual or automatic control of the air source; the fixed frame 11 is equipped with a device 22 for air source detection and stable air source processing, a pneumatic control valve 24, and a delay valve 25 for delay control of the cylinder 10.

[0029] The working principle of this embodiment is as follows: After the sand core 20 is assembled on the core assembly fixture, the lower core system moves to the top of the core assembly fixture and then moves down. The positioning guide post 8 is positioned with the core assembly fixture, and the lower frame 2 first contacts the core assembly fixture. After the lower frame 2 contacts the core assembly fixture, the upper frame 1 slowly descends under the action of the nitrogen spring 7, connecting rod 5, and linkage rod 6 to avoid impacting the sand core. During the descent of the upper frame 1, the pneumatic conversion sensing rod 4 contacts the direct-acting round head valve 3. Under the action of the pneumatic control valve 24 and the delay valve 25, the piston rod of the cylinder 10 retracts after a few seconds, and the gripper 14 clamps the sand core 20. The lower core system is lifted, and the sand core 20 rises with the upper frame 1. The sand core 20 and the core assembly fixture are then aligned. After disassembly, the lower frame 2 and positioning guide post 8 detach from the core assembly fixture; the sand core 20 is hoisted to above the molding line along with the lower core system and placed on the corresponding model; the lower core system descends, the positioning guide post 8 is positioned with the model sand frame, and the lower frame 2 contacts the sand frame first; after the lower frame contacts the core assembly fixture, the upper frame 1 slowly descends under the action of nitrogen spring 7, connecting rod 5 and linkage rod 6, slowly placing the sand core 20 into the cavity; during the descent of the upper frame 1, the pneumatic conversion sensing rod 4 contacts the direct-acting round head valve 3; under the action of pneumatic control valve 24 and delay valve 25, after a few seconds the piston rod of cylinder 10 is pushed out, and the gripper 14 disengages from the sand core 20; the lower core system is then lifted to enter the next working cycle.

[0030] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A core-lifting system for transporting sand cores, characterized in that, include: A frame device, comprising an upper frame and a lower frame, wherein a guide rod is provided on the lower frame, the guide rod passing through the upper frame and slidably connected to the upper frame; the frame device is provided with a limiting mechanism for restricting the relative sliding of the upper frame and the lower frame; A buffer device is configured to cushion the sliding between the upper frame and the lower frame. A gripper device includes a fixed frame, a rotating shaft, grippers, and a drive mechanism for driving the rotating shaft to rotate. The fixed frame is connected to the frame device. The rotating shaft and the grippers are rotatably connected to the fixed frame. A camshaft for driving the grippers to reciprocate is sleeved on the rotating shaft. The camshaft is slidably connected to the end of the grippers. The limiting mechanism includes a fixed rod and a connecting rod. The fixed rod is connected to the upper frame, and the side wall of the connecting rod is rotatably connected to the upper frame. The side walls of the guide rod and the fixed rod are respectively provided with waist-shaped holes, and the two ends of the connecting rod are slidably connected to the fixed rod and the guide rod through the waist-shaped holes.

2. The core-lowering system for transporting sand cores according to claim 1, characterized in that: The lower frame is provided with a linkage rod for supporting and protecting the connecting rod. The linkage rod passes through the upper frame and is slidably connected to the upper frame.

3. The core-lifting system for transporting sand cores according to claim 1, characterized in that: The buffer device includes a nitrogen spring, the cylinder of which is connected to the upper frame, and the plunger rod of which is connected to the lower frame.

4. The core-lowering system for transporting sand cores according to claim 1, characterized in that: The lower frame is provided with positioning guide posts for positioning the frame assembly and the core assembly tooling.

5. The core-lowering system for transporting sand cores according to claim 1, characterized in that: The gripper is provided with a return spring and a spring mounting hole. The return spring is located on the side of the gripper's rotating shaft. One end of the return spring is connected to the gripper head, and the other end of the return spring is slidably connected to the outer wall of the camshaft.

6. The core-lifting system for transporting sand cores according to claim 1, characterized in that: The drive mechanism includes a cylinder and a power crank arm. The cylinder body is connected to the fixed frame, one end of the power crank arm is connected to the side wall of the rotating shaft, and the other end of the power crank arm is hinged to the piston rod of the cylinder.

7. The core-lowering system for transporting sand cores according to claim 1, characterized in that: The rotating shaft includes a driving shaft and a driven shaft. The driving shaft is located on one side of the fixed frame, and the driven shaft is located on the other side of the fixed frame. A transmission rod is provided between the driving shaft and the driven shaft. A hinge rod is provided on the driving shaft and the driven shaft respectively. One end of the hinge rod is connected to the driving shaft and the driven shaft respectively, and the other end of the hinge rod is hinged to the transmission rod.

8. The core-lifting system for transporting sand cores according to claim 1, characterized in that: The fixing frame is provided with sand core clamping plates on both sides of the adjacent claw for limiting the sand core.

9. The core-lifting system for transporting sand cores according to claim 1, characterized in that: The lower frame is equipped with a sensing rod for monitoring the relative displacement between the upper frame and the lower frame.

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