Sand core transfer fixture

Abstract

The utility model discloses a sand core transfer clamp relates to sand core clamp field, including with the fixed plate of transfer mechanical arm output end link, the top of fixed plate is equipped with two downward recessed sliding slot, one the sliding slot is divided into left and right two parts, and the two inner walls of left and right two parts the sliding slot are respectively rotatory installation has one screw rod, and the inside fixed mounting of another the sliding slot has the guide rod, two the outer wall of screw rod all thread connection has a sliding block, the outer wall sliding connection of guide rod has another two sliding blocks, the top both ends of fixed plate are installed respectively and drive two the rotating mechanism of screw rod and rotate. The utility model discloses through setting up two groups of rotating mechanism and corresponding screw rod, pressure sensor, can be stepped to the clamped two sides of sand core and carry out clamping, guarantees the stability of clamping force, sets up locking clamping mechanism simultaneously, can avoid the unstable phenomenon that sand core appears after being grabbed.

Description

Technical Field

[0001] This utility model relates to the field of clamps for sand cores, specifically a sand core transfer clamp. Background Technology

[0002] In cases where the product structure is complex, a sand core casting method is generally used for product molding. The sand core can be manufactured by 3D printing. After manufacturing, the sand core needs to be transferred, which is generally done by a transfer robotic arm in conjunction with a clamping device.

[0003] In existing technologies, clamps generally move synchronously in opposite directions or in opposite directions to achieve the purpose of clamping or releasing. However, due to the different shapes of the two sides of the sand core being clamped and the movement error between the two clamps and the two sides of the sand core being clamped, it is easy for one side to be subjected to excessive force during the clamping process, which can easily lead to damage to the sand core. Utility Model Content

[0004] The purpose of this utility model is to provide a sand core transfer fixture in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a sand core transfer fixture, comprising a fixed base connected to the output end of a transfer robotic arm. The top of the fixed base has two downwardly recessed sliding grooves. One sliding groove is divided into left and right parts, and a screw is rotatably mounted on each of the two inner walls of the left and right sliding grooves. A guide rod is fixedly mounted inside the other sliding groove. A slider is threadedly connected to the outer wall of each of the two screws. Two other sliders are slidably connected to the outer wall of the guide rod. Rotation mechanisms for driving the two screws to rotate are respectively installed at both ends of the top of the fixed base. A downwardly protruding fixed rod is fixedly mounted at the bottom end of the slider. A fixed plate is fixedly mounted at the bottom end of the fixed rod. A locking clamping mechanism penetrating the fixed plate and extending to the outside of the fixed plate is installed on the inner side of the fixed plate. Infrared limit switches assisting the slider in resetting are installed at both ends of the bottom end of the slider.

[0006] As a further embodiment of this utility model: the rotating mechanism includes a servo motor mounted on the top of the fixed base via a bracket, a drive pulley coaxially fixedly mounted on the output end of the servo motor, a driven pulley being connected to the drive pulley via a transmission belt, and two driven pulleys coaxially fixedly mounted on the ends of the two screws that are far apart from each other.

[0007] As a further embodiment of this utility model: the locking clamping mechanism includes a sliding rod that is axially slidably connected to the fixed plate, and an mounting plate is fixedly installed at one end of the sliding rod located inside the fixed plate. A spring that is sleeved with the sliding rod is installed between the fixed plate and the mounting plate. A pressure sensor that penetrates to the inside of the fixed plate is installed at the center of the fixed plate.

[0008] As a further embodiment of this utility model: the locking clamping mechanism further includes a vertical groove formed at the bottom end of the fixed plate and recessed upwards, a locking plate is slidably installed on the inner wall of the vertical groove, two locking plates located inside the same fixed plate are connected by a connecting frame, and an electric push cylinder fixedly connected to the connecting frame is installed on the top of the fixed plate.

[0009] As a further improvement of this utility model: the inner side of the mounting plate is provided with a mounting groove, the top of the mounting groove is an open structure, and the bottom of the mounting groove is a closed structure.

[0010] As a further embodiment of this utility model: the pressure sensor is electrically connected to the servo motor and the electric push cylinder through the controller, and the infrared limit switch is electrically connected to the servo motor and the electric push cylinder through the controller.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. By setting two sets of rotating mechanisms and corresponding screws and pressure sensors, the sand core can be clamped on both sides in stages, ensuring the stability of the clamping force. At the same time, a locking clamping mechanism is set to avoid instability after the sand core is picked up. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the structure of this utility model from another perspective;

[0015] Figure 3 This is a schematic diagram of the locking and clamping mechanism of this utility model;

[0016] Figure 4 This is a schematic diagram of the sliding installation of the locking plate of this utility model.

[0017] In the diagram: 1. Fixed base; 2. Sliding groove; 3. Screw; 4. Guide rod; 5. Slider; 6. Servo motor; 7. Driving pulley; 8. Driven pulley; 9. Fixed rod; 10. Fixed plate; 11. Sliding rod; 12. Spring; 13. Mounting plate; 14. Mounting groove; 15. Vertical groove; 16. Connecting bracket; 17. Electric push cylinder; 18. Pressure sensor; 19. Locking plate; 20. Infrared limit switch. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figures 1-4 In this embodiment of the utility model, a sand core transfer fixture includes a fixed base 1 connected to the output end of a transfer robotic arm. The top of the fixed base 1 has two downwardly recessed sliding grooves 2. One sliding groove 2 is divided into left and right parts, and a screw 3 is rotatably installed on the two inner walls of the left and right sliding grooves 2 respectively. A guide rod 4 is fixedly installed inside the other sliding groove 2. A slider 5 is threadedly connected to the outer wall of each of the two screws 3. Two other sliders 5 are slidably connected to the outer wall of the guide rod 4. Rotation mechanisms for driving the two screws 3 to rotate are respectively installed at both ends of the top of the fixed base 1. A downwardly protruding fixed rod 9 is fixedly installed at the bottom end of the slider 5. A fixed plate 10 is fixedly installed at the bottom end of the fixed rod 9. A locking clamping mechanism that penetrates the fixed plate 10 and extends to the outside of the fixed plate 10 is installed on the inner side of the fixed plate 10. Infrared limit switches 20 for assisting the slider 5 to reset are installed at both ends of the bottom end of the slider 5.

[0020] In this embodiment: First, after the sand core is formed, when clamping and transferring it, the transfer robotic arm drives the device to move above the sand core. Then, the transfer robotic arm drives the entire device to move downward until the locking clamping mechanism is located on the outside of the sand core. Then, the rotating mechanism is activated. The rotating mechanism drives the clamp installed on the inside of the locking clamping mechanism to clamp and transfer the sand core. After effective clamping, the current position of the locking clamping mechanism is limited to avoid the problem of the clamped sand core becoming loose.

[0021] After the transfer robotic arm transfers the sand core to the storage platform, the rotating mechanism is activated in reverse, which drives the locking and clamping mechanism to reset to the initial position.

[0022] By designing two rotating mechanisms, the problem of clamping damage caused by inconsistent clamping forces on both sides can be avoided when clamping the sand core.

[0023] Please refer to this carefully. Figure 1 The rotating mechanism includes a servo motor 6 mounted on the top of the fixed base 1 via a bracket. The output end of the servo motor 6 is coaxially fixedly mounted with a drive pulley 7. The drive pulley 7 is connected to a driven pulley 8 via a transmission belt. The two driven pulleys 8 are coaxially fixedly mounted at the ends of the two screws 3 that are far apart from each other.

[0024] In this embodiment: by starting the servo motor 6, the output shaft of the servo motor 6 can drive the active pulley 7 to rotate, and the active pulley 7 can drive the driven pulley 8 to rotate through the transmission belt. The two driven pulleys 8 can drive the screw 3 connected to them on the same axis to rotate synchronously. At this time, the sliders 5 that are threadedly connected to the two screws 3 can move in opposite directions, thereby driving the two locking clamping mechanisms to move in opposite directions to clamp or release the sand core.

[0025] Please refer to this carefully. Figure 2 , Figure 3 and Figure 4 The locking and clamping mechanism includes a sliding rod 11 that is axially slidably connected to the fixed plate 10. A mounting plate 13 is fixedly installed at one end of the sliding rod 11 located inside the fixed plate 10. A spring 12 that is sleeved with the sliding rod 11 is installed between the fixed plate 10 and the mounting plate 13. A pressure sensor 18 that penetrates to the inside of the fixed plate 10 is installed at the center of the fixed plate 10. The locking and clamping mechanism also includes a vertical groove 15 that is recessed upward at the bottom of the fixed plate 10. A locking plate 19 is slidably installed on the inner wall of the vertical groove 15. Two locking plates 19 located inside the same fixed plate 10 are connected by a connecting frame 16. An electric push cylinder 17 that is fixedly connected to the connecting frame 16 is installed on the top of the fixed plate 10.

[0026] In this embodiment: when the two sets of sliders 5 move towards each other, the sliders 5 drive the fixed plate 10 to move synchronously through the fixed rod 9 until the clamp installed on the mounting plate 13 contacts the outer side of the sand core. At this time, the mounting plate 13 stops moving. At this time, the continuously moving fixed plate 10 drives the pressure sensor 18 to continue moving, and the spring 12 is compressed until the sensing end of the pressure sensor 18 contacts the outer side of the mounting plate 13 and generates pressure. When the pressure reaches the preset pressure, the pressure sensor 18 sends an electrical signal to the controller. The controller controls the servo motor 6 to stop running and simultaneously controls the electric push cylinder 17 to shorten. At this time, the piston rod of the electric push cylinder 17 drives the two locking plates 19 to slide upward in the vertical groove 15 through the connecting frame 16. The top rubber layer of the locking plate 19 can squeeze the outer wall of the sliding rod 11. Under the friction, the sliding rod 11 cannot move.

[0027] Until both sides of the sand core are effectively clamped, the above method can effectively avoid the problem of unstable clamping or excessive clamping on one side of the sand core;

[0028] The design of the locking plate 19 can avoid the two sets of springs 12 self-resetting due to the inconsistent compression of the springs 12 on both sides (the sand core is clamped on both sides with inconsistent shapes and inconsistent force distribution, resulting in inconsistent compression of the springs 12), thus ensuring the stability during clamping and transportation.

[0029] Please refer to this carefully. Figure 2 , Figure 3 and Figure 4 The inner side of the mounting plate 13 is provided with a mounting groove 14, the top of the mounting groove 14 is open and the bottom of the mounting groove 14 is closed.

[0030] In this embodiment, a corresponding clamp can be installed according to the shape of both sides of the clamped sand core. The sliding mounting block on the clamp matches the mounting groove 14, and the clamp can be installed and removed by sliding up and down.

[0031] Please refer to this carefully. Figure 2 and Figure 3 The pressure sensor 18 is electrically connected to the servo motor 6 and the electric push cylinder 17 through the controller, and the infrared limit switch 20 is electrically connected to the servo motor 6 and the electric push cylinder 17 through the controller.

[0032] In this embodiment: when the sand core is transferred to the storage platform, the rotating mechanism is controlled to rotate in the opposite direction to achieve a complete reset of the locking clamping mechanism. After the slider 5 is fully reset, the distance to the infrared limit switch 20 reaches the minimum distance. At this time, the infrared limit switch 20 sends an electrical signal to the controller, which controls the servo motor 6 to stop running and simultaneously controls the electric push cylinder 17 to extend to the initial position for convenient subsequent continuous clamping.

[0033] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A sand core transfer fixture, comprising a fixed base (1) connected to the output end of a transfer robotic arm, characterized in that, The top of the fixed base (1) has two downward recessed sliding grooves (2). One of the sliding grooves (2) is divided into left and right parts. A screw (3) is rotatably installed on the two inner walls of the two sliding grooves (2) divided into left and right parts. A guide rod (4) is fixedly installed inside the other sliding groove (2). A slider (5) is threadedly connected to the outer wall of each of the two screws (3). Two other sliders (5) are slidably connected to the outer wall of the guide rod (4). Rotation mechanisms that drive the two screws (3) to rotate are installed at both ends of the top of the fixed base (1). A downward protruding fixed rod (9) is fixedly installed at the bottom end of the slider (5). A fixed plate (10) is fixedly installed at the bottom end of the fixed rod (9). A locking clamping mechanism that penetrates the fixed plate (10) and extends to the outside of the fixed plate (10) is installed on the inner side of the fixed plate (10). Infrared limit switches (20) that assist the slider (5) in resetting are installed at both ends of the bottom end of the slider (5).

2. The sand core transfer fixture according to claim 1, characterized in that, The rotating mechanism includes a servo motor (6) mounted on the top of the fixed base (1) via a bracket. The output end of the servo motor (6) is coaxially fixedly mounted with a drive pulley (7). The drive pulley (7) is connected to a driven pulley (8) via a transmission belt. The two driven pulleys (8) are coaxially fixedly mounted at the ends of the two screws (3) that are far apart from each other.

3. The sand core transfer fixture according to claim 1, characterized in that, The locking clamping mechanism includes a sliding rod (11) that is axially slidably connected to the fixed plate (10). A mounting plate (13) is fixedly installed at one end of the sliding rod (11) located inside the fixed plate (10). A spring (12) that is sleeved with the sliding rod (11) is installed between the fixed plate (10) and the mounting plate (13). A pressure sensor (18) that penetrates to the inside of the fixed plate (10) is installed at the center of the inside of the fixed plate (10).

4. A sand core transfer fixture according to claim 3, characterized in that, The locking clamping mechanism also includes a vertical groove (15) recessed upward at the bottom of the fixed plate (10). A locking plate (19) is slidably installed on the inner wall of the vertical groove (15). Two locking plates (19) located inside the same fixed plate (10) are connected by a connecting frame (16). An electric push cylinder (17) fixedly connected to the connecting frame (16) is installed on the top of the fixed plate (10).

5. A sand core transfer fixture according to claim 4, characterized in that, The mounting plate (13) has an mounting groove (14) on its inner side. The top of the mounting groove (14) is open and the bottom of the mounting groove (14) is closed.

6. A sand core transfer fixture according to claim 5, characterized in that, The pressure sensor (18) is electrically connected to the servo motor (6) and the electric push cylinder (17) through the controller, and the infrared limit switch (20) is electrically connected to the servo motor (6) and the electric push cylinder (17) through the controller.

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