An automatic mold closing device for sand casting

Abstract

The utility model relates to the field of sand casting equipment technology, concretely to a kind of automatic moulding device for sand casting, it includes: rack, rack includes guide rail, and the feeding mechanism is equipped below guide rail, and feeding mechanism is used to transport sand mould, and mobile assembly is equipped on guide rail, and mobile assembly includes moving car, and moving car moves along guide rail, and lifting structure is equipped below moving car, and lifting structure is connected with gripper assembly, and gripper assembly is used to clamp sand mould.The utility model, middle gripper spacing is adjustable, can change the contact point of gripper and sand mould, avoid the sand mould deformation caused by the inappropriateness of gripper spacing;By setting buffer structure, utilize gasket can absorb part of small vibration, avoid the damage of sand mould caused by vibration in hoisting process;By adjusting the height of pad, the height difference caused by gripper machining error can be eliminated, to avoid sand mould damage due to uneven stress.

Description

Technical Field

[0001] This utility model relates to the technical field of sand casting equipment, specifically an automatic mold closing device for sand casting. Background Technology

[0002] Sand casting, also known as sand mold casting, is a traditional casting process that uses sand molds to manufacture metal castings. The principle is to use a mold to press out a cavity in molding sand to make a sand mold. After the two sand molds are closed, molten metal is poured into the cavity. After the molten metal cools, a casting blank is obtained. Subsequent processing such as grinding is then carried out to obtain the desired workpiece.

[0003] In existing technologies, sand molds are generally transported directly by conveyor belts, with one sand mold placed upright and the other in reverse. Then, a hoisting structure is used to hoist the upper sand mold onto the top surface of the lower sand mold to complete the mold closing. The closed sand mold is then hoisted onto a transport device and transported to the pouring station.

[0004] Current hoisting structures typically employ hydraulically driven metal grippers to hold the sand mold from both sides and hook it onto the bottom edge. There are usually four grippers, two on each side. Due to machining and assembly precision limitations, the hook surfaces of the four grippers have height differences, causing the sand mold to be less than perfectly horizontal, affecting assembly accuracy. Furthermore, these height differences lead to uneven stress on the sand mold, which can be damaged by equipment vibration during horizontal movement. Additionally, in existing technologies, the gripper spacing is fixed, limiting its compatibility to sand molds of fixed length. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides an automatic mold closing device for sand casting.

[0006] The technical solution of this utility model is:

[0007] An automatic mold closing device for sand casting includes:

[0008] The frame includes a guide rail, a feeding mechanism is provided below the guide rail for conveying sand molds, a moving component is provided on the guide rail, the moving component includes a moving trolley, the moving trolley moves along the guide rail, a lifting structure is provided below the moving trolley, the lifting structure is connected to a gripper assembly for gripping sand molds;

[0009] The gripper assembly includes several L-shaped grippers, which are symmetrically located on the front and rear sides of the lifting structure. The heads of the grippers are rotatably connected to the lifting structure through a rotating mechanism. The spacing between the grippers on the same side is adjustable. A buffer structure is provided at the position where the grippers contact the sand mold, and the height of the buffer structure is adjustable.

[0010] Preferably, the lifting structure includes a telescopic rod, which is fixedly installed in the middle of the roof of the mobile vehicle. The piston rod of the telescopic rod passes downward through the mobile vehicle and is connected to a lifting plate. When the telescopic rod is working, it can drive the lifting plate to move up and down.

[0011] Preferably, the rotating mechanism includes two rotating shafts, which are rotatably mounted on the front and rear sides of the lifting plate via a rotating frame. A second telescopic rod is connected to the middle of the rotating shaft via a connecting frame, and the second telescopic rod is used to drive the rotating shaft to rotate.

[0012] Preferably, there are at least four grippers, with an average of at least two on each side, and the gripper heads are slidably mounted on the rotating shaft and fixed to the rotating shaft by fastening elements.

[0013] Preferably, a sliding rod is provided in the middle of the gripper on the same side, and the sliding rod is perpendicular to the vertical part of the gripper.

[0014] Preferably, the buffer structure includes a pad located on the top surface of the horizontal portion of the gripper, and the height of the pad is adjustable.

[0015] Preferably, the top surface of the pad is provided with a gasket, the gasket is made of elastic material, and the gasket extends upward near the gripper to cover the surface of the gripper near the sand mold.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] This invention features an adjustable gripper spacing, which allows for changing the contact point between the gripper and the sand mold, preventing deformation of the sand mold due to improper gripper spacing. A buffer structure is incorporated, using pads to absorb some minor vibrations, preventing damage to the sand mold during hoisting. Adjusting the height of the pads eliminates height differences caused by gripper machining errors, preventing damage to the sand mold due to uneven force. Attached Figure Description

[0018] Figure 1 This is a first schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a second schematic diagram of the overall structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the moving component and the gripper component in this utility model;

[0021] Figure 4 This is a schematic diagram of the gripper assembly structure in this utility model;

[0022] Figure 5 This is a schematic diagram of the gripper structure in this utility model.

[0023] The meanings of the labels in the diagram are as follows:

[0024] 1. Frame; 11. Column; 12. Guide rail; 13. Feeding mechanism;

[0025] 2. Moving components; 21. Top plate; 22. Casters; 23. Power source; 24. Telescopic pole; 25. Lifting platform;

[0026] 3. Gripper assembly; 31. Rotating frame; 32. Rotating shaft; 33. Gripper; 34. Slide rod; 35. Second telescopic rod; 36. Connecting frame; 37. Pad; 38. Adjustment groove; 39. Shim.

[0027] 4. Sand mold. Detailed Implementation

[0028] 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.

[0029] Example 1:

[0030] Please see Figure 1-5 The present invention will describe the above technical solution in detail through the following embodiments:

[0031] An automatic mold closing device for sand casting includes:

[0032] The frame 1 includes a guide rail 12, and a feeding mechanism 13 is provided below the guide rail 12. The feeding mechanism 13 is used to transport the sand mold 4. A moving component 2 is provided on the guide rail 12. The moving component 2 includes a moving cart. The moving cart moves along the guide rail 12. A lifting structure is provided below the moving cart. The lifting structure is connected to a gripper assembly 3. The gripper assembly 3 is used to grip the sand mold 4.

[0033] The frame 1 also includes a column 11, a guide rail 12 is fixedly installed on the top of the column 11 by bolts, and a feeding mechanism 13 is fixedly installed in the middle of the column 11 by bolts.

[0034] The guide rail 12 is a railway rail, and the feeding mechanism 13 can be a known roller conveyor device.

[0035] When the feeding mechanism 13 is working, it can drive the sand mold 4 to move in the horizontal direction.

[0036] It should be noted that in practical applications, a limiting device needs to be set on the guide rail 12 at the end of the feeding mechanism 13.

[0037] The limiting device at the end of the feeding mechanism 13 is used to limit the movement distance of the sand mold 4 and determine the position of the sand mold 4. This function can be achieved by welding a metal plate to the end of the feeding mechanism 13.

[0038] The limit device on guide rail 12 is used to determine the position of the moving vehicle. Known technologies such as limit switches, inductive proximity sensors, and photoelectric sensors can be used.

[0039] These are all existing technical methods, which will not be elaborated upon here.

[0040] The mobile vehicle includes a top plate 21, and a set of casters 22 are rotatably mounted on the underside of the top plate 21 via bearings. The casters 22 are adapted to a guide rail 12 and can roll along the guide rail 12. The guide rail 12 is used to limit the rolling direction of the casters 22.

[0041] A power source 23 is fixedly installed on the side of the top plate 21 by bolts. The power source 23 uses an electrode with a reduction mechanism. The output shaft of the power source 23 is connected to one of the moving wheels 22 through a coupling. When the power source 23 is powered on, it can drive the moving wheel 22 connected to it to rotate, thereby driving the top plate 21 to move along the guide rail 12.

[0042] The lifting structure includes a telescopic rod 24, which is fixedly installed in the middle of the top surface of the mobile vehicle. The piston rod of the telescopic rod 24 passes downward through the mobile vehicle and is connected to the lifting plate 25.

[0043] The telescopic rod 24 uses a known hydraulic cylinder, and the cylinder of the telescopic rod 24 is fixedly installed on the top surface of the top plate 21 by bolts. When the telescopic rod 24 is working, it can drive the lifting plate 25 to move up and down.

[0044] The gripper assembly 3 includes several L-shaped grippers 33, which are symmetrically located on the front and rear sides of the lifting structure. The heads of the grippers 33 are rotatably connected to the lifting structure through a rotating mechanism. The spacing between the grippers 33 on the same side is adjustable. A buffer structure is provided at the position where the grippers 33 contact the sand mold 4. The height of the buffer structure is adjustable.

[0045] The bottom of the gripper 33 extends toward the sand mold 4.

[0046] The rotating mechanism includes two rotating shafts 32. The rotating shafts 32 are rotatably mounted on the front and rear sides of the lifting plate 25 via a rotating frame 31. A second telescopic rod 35 is connected to the middle of the rotating shaft 32 via a connecting frame 36. The second telescopic rod 35 is used to drive the rotating shaft 32 to rotate.

[0047] The connecting frame 36 is connected to the rotating shaft 32 via an expansion sleeve, which allows for easy adjustment of the angle of the connecting frame 36. The end of the second telescopic rod 35 is rotatably connected to the top plate 21.

[0048] The second telescopic rod 35 uses a known hydraulic cylinder. When the piston rod of the second telescopic rod 35 moves, it can drive the rotating shaft 32 to rotate through the connecting frame 36.

[0049] When the lifting plate 25 moves up and down, it can drive the gripper assembly 3 to move up and down.

[0050] There are at least four grippers 33, with an average of at least two on each side. The heads of the grippers 33 are slidably mounted on the rotating shaft 32 and fixed to the rotating shaft 32 by fastening elements.

[0051] In this embodiment, there are four grippers 33, two on each side.

[0052] The fastening element can be a known shrink sleeve, which enables a keyless connection and facilitates adjustment of the position and angle of the gripper 33. There is no need to provide a keyway or spline on the rotating shaft 32, reducing machining difficulty.

[0053] The rotation of the rotating shaft 32 can drive the gripper 33 to rotate.

[0054] It should be noted that the grippers 33 on both sides rotate in opposite directions, but at the same speed and angle.

[0055] Two second telescopic rods 35 can be connected simultaneously via a known hydraulic synchronization pipeline to ensure that the two second telescopic rods 35 move synchronously.

[0056] A sliding rod 34 is provided in the middle of the gripper 33 on the same side, and the sliding rod 34 is perpendicular to the vertical part of the gripper 33.

[0057] The slide bar 34 is used to ensure that the grippers 33 on the same side move synchronously, and to prevent the grippers 33 from rotating accidentally when adjusting the distance between the grippers 33, which would cause an angle between the grippers 33.

[0058] The slide bar 34 is threaded with nuts, and the two nuts work together to hold the jaws 33, thus fixing the slide bar 34 and the jaws 33.

[0059] The buffer structure includes a pad 37, which is located on the top surface of the horizontal portion of the gripper 33, and the height of the pad 37 is adjustable.

[0060] The side of the pad 37 is provided with an adjustment groove 38, which is an oblong hole. The pad 37 is fixedly connected to the clamp 33 by bolts passing through the adjustment groove 38.

[0061] When the bolts are loosened, the shim 37 can slide relative to the clamp 33 via the adjusting groove 38, thereby adjusting the height of the shim 37. By adjusting the height of the shim 37, the height difference between the clamps 33 caused by machining and installation errors can be eliminated, ensuring that the sand mold 4 is level.

[0062] The top surface of the pad 37 is provided with a pad 39. The pad 39 is made of elastic material. The pad 39 extends upward on the side near the gripper 33 and covers the surface of the gripper 33 near the sand mold 4.

[0063] The gasket 39 can be made of rubber or nylon. The gasket 39 is in direct contact with the sand mold 4, which can prevent the sand mold 4 from being damaged by collision with the gripper 33. It can also absorb some minor vibrations and increase the friction between the gripper assembly 3 and the sand mold 4, thereby improving the gripping stability.

[0064] Working principle:

[0065] Adjust the height of the shim 37 and use measuring tools such as a spirit level to ensure that all the shims 39 are on the same horizontal plane.

[0066] Fetching phase:

[0067] Control the power source 23 to work, move the gripper assembly 3 to directly above the first sand mold 4, use the telescopic rod 24 to lower the gripper assembly 3, and at the same time control the second telescopic rod 35 to work, so that the gripper 33 rotates upward and opens the gripper 33.

[0068] After the gripper assembly 3 is lowered to the appropriate position, the telescopic rod 24 stops working, and the piston rod of the second telescopic rod 35 is extended, causing the gripper 33 to rotate downwards until the gripper 33 is in a vertical position, clamping the first sand mold 4. The second telescopic rod 35 stops working and maintains pressure. At this time, the gasket 39 is in contact with the side of the first sand mold 4.

[0069] Mold closing stage:

[0070] The gripper assembly 3 is raised using the telescopic rod 24. At this time, the pad 39 simultaneously contacts the side and bottom edge of the first sand mold 4, enabling the first sand mold 4 to be lifted. When the bottom surface of the first sand mold 4 is higher than that of the second sand mold 4, the telescopic rod 24 stops working.

[0071] Control the power source 23 to work and move the gripper assembly 3 to directly above the second sand mold 4.

[0072] The clamping assembly 3 is lowered using the telescopic rod 24 until the first sand mold 4 covers the top surface of the second sand mold 4. The telescopic rod 24 then stops working.

[0073] Transportation phase:

[0074] Control the second telescopic rod 35 to rotate the gripper 33 upward and open the gripper 33.

[0075] Continue to use the telescopic rod 24 to lower the gripper assembly 3. After the bottom of the gripper assembly 3 is lower than the second sand mold 4, the telescopic rod 24 stops working.

[0076] The piston rod of the second telescopic rod 35 is extended, causing the gripper 33 to rotate downwards until it is in a vertical position, clamping the first sand mold 4 and the second sand mold 4. The operation of the second telescopic rod 35 is stopped, and pressure is maintained. At this time, the gasket 39 is in contact with the sides of the two sand molds 4.

[0077] The gripper assembly 3 is raised using the telescopic rod 24. At this point, the pad 39 contacts the sides of the two sand molds 4 and the bottom edge of the first sand mold 4. This allows both sand molds 4 to be lifted simultaneously. After the second sand mold 4 has moved a certain height away from the feeding mechanism 13, the telescopic rod 24 stops working.

[0078] Control the power source 23 to work and move the gripper assembly 3 and the two sand molds 4 to the next operating station.

[0079] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An automatic mold closing device for sand casting, characterized in that, include: A frame (1) is provided, the frame (1) includes a guide rail (12), a feeding mechanism (13) is provided below the guide rail (12), the feeding mechanism (13) is used to transport the sand mold (4), a moving component (2) is provided on the guide rail (12), the moving component (2) includes a moving cart, the moving cart moves along the guide rail (12), a lifting structure is provided below the moving cart, the lifting structure is connected to a gripper assembly (3), the gripper assembly (3) is used to grip the sand mold (4); The gripper assembly (3) includes several L-shaped grippers (33). The grippers (33) are symmetrically located on the front and rear sides of the lifting structure. The heads of the grippers (33) are rotatably connected to the lifting structure through a rotating mechanism. The spacing between the grippers (33) on the same side is adjustable. A buffer structure is provided at the position where the grippers (33) contact the sand mold (4). The height of the buffer structure is adjustable.

2. The automatic mold closing device for sand casting as described in claim 1, characterized in that: The lifting structure includes a telescopic rod (24), which is fixedly installed in the middle of the top surface of the mobile vehicle. The piston rod of the telescopic rod (24) passes downward through the mobile vehicle and is connected to a lifting plate (25). When the telescopic rod (24) is working, it can drive the lifting plate (25) to move up and down.

3. The automatic mold closing device for sand casting as described in claim 2, characterized in that: The rotating mechanism includes two rotating shafts (32). The rotating shafts (32) are rotatably mounted on the front and rear sides of the lifting plate (25) via a rotating frame (31). A second telescopic rod (35) is connected to the middle of the rotating shaft (32) via a connecting frame (36). The second telescopic rod (35) is used to drive the rotating shaft (32) to rotate.

4. The automatic mold closing device for sand casting as described in claim 3, characterized in that: The grippers (33) are at least four in number, with an average of at least two on each side. The heads of the grippers (33) are slidably mounted on the rotating shaft (32) and fixed to the rotating shaft (32) by fastening elements.

5. The automatic mold closing device for sand casting as described in claim 4, characterized in that: A sliding rod (34) is provided in the middle of the gripper (33) on the same side, and the sliding rod (34) is perpendicular to the vertical part of the gripper (33).

6. The automatic mold closing device for sand casting as described in claim 4, characterized in that: The buffer structure includes a pad (37) located on the top surface of the horizontal portion of the gripper (33), and the height of the pad (37) is adjustable.

7. An automatic mold closing device for sand casting as described in claim 6, characterized in that: The top surface of the pad (37) is provided with a pad (39), the pad (39) is made of elastic material, the pad (39) extends upward near the gripper (33) and covers the surface of the gripper (33) near the sand mold (4).

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