A ductile iron manhole cover casting sand core automatic core making equipment and core making method
By controlling the tray flipping through hydraulic push rods and threaded rods, automated debris cleaning was achieved, solving the problem of debris cleaning in core-making equipment and reducing the labor intensity and cleaning difficulty for operators.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ANHUI JUNQI PRECISION MACHINERY CO LTD
- Filing Date
- 2026-05-27
- Publication Date
- 2026-06-26
AI Technical Summary
In existing core-making processes, debris is difficult to clean from inside the core-making equipment, resulting in high labor intensity for operators and significant cleaning difficulties.
A hydraulic push rod is used to move the mold workpiece out of the processing chamber to the extension table, and the threaded rod controls the lowering of the support plate to make the extension table flip, causing the debris to slide off autonomously. Combined with the cooperation of the guide plate and the positioning block, automatic clamping and positioning are achieved to avoid the accumulation of debris inside the equipment.
It reduces the difficulty and labor intensity of manual cleaning, ensures the positional accuracy of the mold during the moving and flipping cleaning process, and prevents the sand core from being bumped and damaged.
Smart Images
Figure CN122274099A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of manhole cover production equipment technology, and in particular to an automatic core-making equipment and method for casting ductile iron manhole covers. Background Technology
[0002] Ductile iron manhole covers are widely used in municipal road construction and underground pipeline facilities due to their excellent mechanical properties and corrosion resistance. In the casting process of manhole covers, the preparation of sand cores is a crucial step, as their quality directly determines the dimensional accuracy and forming effect of the internal cavity structure of the manhole cover. Currently, specialized core-making equipment such as core shooters and shell core machines are commonly used to produce manhole cover sand cores using thermosetting resin-coated sand.
[0003] Existing core-making processes typically include steps such as sand filling, heat hardening, mold removal, and part removal. During the demolding of the sand core and the removal of the finished product, due to the fluidity of the sand particles and the reciprocating opening and closing of the mold, a large number of fine sand particles, resin lumps, or flash debris inevitably remain on the surface of the mold cavity and around the workstation of the core-making equipment. To prevent these residues from affecting the molding quality of the sand core in the next cycle (such as causing rough sand core surface, dimensional deviation, or the generation of scrap), existing technologies usually use manual handheld high-pressure air guns to blow and clean the mold and product.
[0004] In practical applications, although the high-pressure gas can peel the debris from the mold surface, the blown debris will permeate the narrow space and dead corners inside the equipment. Secondly, core-making equipment is usually compact in structure, and the mold is deeply embedded inside the equipment. After long-term continuous operation, the debris scattered everywhere is very easy to accumulate in large quantities in the equipment base, transmission parts and hidden corners. This accumulation of dirt increases the cleaning difficulty and labor intensity for operators. Summary of the Invention
[0005] The purpose of this application is to solve the problem of difficult cleaning of debris in the prior art, and to propose an automatic core-making equipment and method for sand core making for casting ductile iron manhole covers.
[0006] To achieve the above objectives, this application adopts the following technical solution: An automatic core-making device for casting ductile iron manhole covers includes a core-making machine body, a processing cavity is opened on the front end face of the core-making machine body, and a rotating shaft is rotatably mounted on the front end face of the core-making machine body; An extension table is fixed to the front end face of the rotating shaft. The top end of the extension table and the bottom end of the inner cavity of the processing chamber are at the same horizontal plane. Both top ends are provided with two slide rails on the same axis. The mold workpiece is slidably mounted on the top of the slide rail via a slider. A hydraulic push rod is fixed to the front end face of the extension table. The output end of the hydraulic push rod is connected to the mold workpiece and is used to drive the mold workpiece to move along the slide rail between the processing cavity and the extension table. The top of the extension platform is also provided with two first translation grooves. A slider is slidably installed in the first translation groove. An L-shaped positioning block is welded and fixed to the top of the slider. The bottom of the short handle end of the L-shaped positioning block is at the same level as the top of the mold workpiece. A return spring is provided in the first translation groove. Guide rods are fixed on the left and right side walls of the core-making machine body. Guide plates are movably fitted on the outer walls of the two guide rods. The front ends of the two guide plates are connected to a connecting plate. A through hole is provided on the connecting plate for the output end of the hydraulic push rod to pass through.
[0007] In the aforementioned automatic core-making equipment for casting ductile iron manhole covers, a lifting groove is provided on the front end face of the core-making machine body, a threaded rod is provided in the lifting groove, a servo motor is installed on the inner wall of the bottom end of the lifting groove, the output end of the servo motor is connected to the threaded rod, and a support plate is movably fitted on the outer wall of the threaded rod, the top end of the support plate can fit against the bottom end of the extension table.
[0008] In the aforementioned automatic core-making equipment for casting ductile iron manhole covers, an extension seat is fixed to the front end face of the core-making machine body. A second translation groove is provided at the top of the extension seat. A sliding seat is slidably installed in the second translation groove. A threaded groove is provided at the top of the sliding seat. A support screw is installed in the threaded groove.
[0009] In the aforementioned automatic core-making equipment for casting ductile iron manhole covers, a slid groove is provided on the extension platform, and a guide block is slidably installed in the slid groove. The top end of the guide block is fixedly connected to the connecting plate.
[0010] In the aforementioned automatic core-making equipment for casting ductile iron manhole covers, the width of the pallet is the same as the width of the lifting groove, ensuring the vertical lifting movement of the pallet.
[0011] In the aforementioned automatic core-making equipment for casting ductile iron manhole covers, the sides of the two guide plates that are close to each other are both set as inclined surfaces, and the inclined surfaces are in close contact with the L-shaped positioning block to guide the displacement of the two guide plates.
[0012] In the aforementioned automatic core-making equipment for casting ductile iron manhole covers, the connecting plate has a through hole for the output end of the hydraulic push rod to pass through, so as to avoid affecting the operation of the hydraulic push rod.
[0013] A core-making method for an automatic core-making device for casting ductile iron manhole covers includes the following steps: S1: After the core-making machine body completes the processing of the sand core, the hydraulic push rod is activated to move all the mold workpieces to the top of the extension table under the guidance of the slide rail, so as to carry out subsequent chip blowing operations.
[0014] S2: During the process of the mold workpiece moving to the top of the extension table, the mold workpiece will contact the connecting plate. The connecting plate and the guide plate will move synchronously towards the front end face of the extension table. During the displacement, the inclined surface of the guide plate will push the two L-shaped positioning blocks closer to each other, so that the short handle ends of the two L-shaped positioning blocks are attached to the top of the mold workpiece to reinforce it.
[0015] S3: Control the threaded rod to rotate clockwise, so that the pallet moves vertically downward under the restriction of the lifting groove. At this time, the extension table will rotate through the rotating shaft because it loses the support of the pallet, causing the mold workpiece on the extension table to tilt, so that a large number of debris on the mold workpiece falls off by itself, and then a small amount of residual debris can be blown out by the air gun.
[0016] S4: Then, by reversing the threaded rod, the support plate is moved upward, and the extension table is reset to a horizontal state. Then, the mold workpiece is pushed into the processing cavity of the core-making machine body for further processing.
[0017] Compared with existing technologies, the advantages of this application are: The mold workpiece is moved out of the processing chamber to the extension table by a hydraulic push rod, and the extension table is flipped by controlling the lowering of the support plate with a threaded rod, so that the mold is tilted and the debris slides off on its own, avoiding the accumulation of debris in the dead corners inside the equipment, reducing the difficulty and labor intensity of manual cleaning.
[0018] By cooperating with the inclined surface of the guide plate and the positioning block, the clamping and positioning are automatically completed during the removal of the mold workpiece without the need for additional power. This ensures the positional accuracy of the mold during the movement and flipping cleaning process and prevents the sand core from being bumped and damaged. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the structure of an automatic core-making device for casting ductile iron manhole covers according to this application. Figure 2 This is a schematic diagram of the sliding seat installation proposed in this application; Figure 3 This is a schematic diagram of the hydraulic push rod installation proposed in this application; Figure 4 This is a schematic diagram of the mold workpiece structure proposed in this application; Figure 5 This is a schematic diagram of the extension stage structure proposed in this application.
[0020] In the diagram: 1. Core-making machine body; 2. Extension table; 3. Rotating shaft; 4. Mold workpiece; 5. Slide rail; 6. Hydraulic push rod; 7. First translation groove; 8. Extension seat; 9. L-shaped positioning block; 10. Return spring; 11. Guide rod; 12. Guide plate; 13. Connecting plate; 14. Lifting groove; 15. Threaded rod; 16. Support plate; 17. Second translation groove; 18. Sliding seat; 19. Support screw. Detailed Implementation
[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0022] Reference Figures 1-5 An automatic core-making device for casting ductile iron manhole covers includes a core-making machine body 1. The core-making machine body 1 can directly adopt existing core shooting machines or shell core machines, which will not be described in detail here. The front end face of the core-making machine body 1 has a processing cavity. A rotating shaft 3 is rotatably mounted on the front end face of the core-making machine body 1 via bearings. An extension platform 2 is welded and fixed to the front end face of the rotating shaft 3. The top end of the extension platform 2 is at the same horizontal plane as the bottom end of the inner cavity of the processing cavity. Two slide rails 5 on the same axis are opened on the top ends of both. Sliding blocks are slidably installed in the slide rails 5. The top ends of the two sliding blocks are connected by screws. A mold workpiece 4 for processing sand cores is attached. A hydraulic push rod 6 is fixed to the front end of the extension table 2 by screws. The rear end of the output end of the hydraulic push rod 6 is connected to the mold workpiece 4 by screws. The hydraulic push rod 6 can be a DYTZ model electro-hydraulic push rod, which is more common in the prior art, to assist the movement of the mold workpiece 4. During the movement of the mold workpiece 4, the slide block slides in the slide rail 5, which can slide the mold workpiece 4 from the processing cavity to the top of the extension table 2 so as to blow away the chips after the mold workpiece 4 is processed, and avoid a large amount of chips in the processing cavity that are not easy to clean.
[0023] The top of the extension platform 2 has two first translation grooves 7. T-shaped sliders adapted to its shape are slidably installed in both first translation grooves 7. L-shaped positioning blocks 9 are welded and fixed to the top of the sliders. The bottom of the short handle of the L-shaped positioning block 9 is at the same level as the top of the mold workpiece 4. A return spring 10 is provided in the first translation groove 7. The return spring 10 is welded to the inner wall of the first translation groove 7 and the slider. The return spring 10 can push the two sliders away from each other so that the L-shaped positioning block 9 is disengaged from the movement path of the mold workpiece 4.
[0024] Guide rods 11 are welded and fixed on the left and right side walls of the core-making machine body 1. Guide plates 12 are movably fitted on the outer walls of the two guide rods 11. The front ends of the two guide plates 12 are welded together to a connecting plate 13. The connecting plate 13 has a through hole adapted to the output end of the hydraulic push rod 6. The output end of the hydraulic push rod 6 passes through the connecting plate 13 through the through hole and connects to the mold workpiece 4. The side of the two guide plates 12 that is close to each other is set as an inclined surface. The inclined surface is in close contact with the L-shaped positioning block 9. When the mold workpiece 4 is moved from the processing cavity to the top of the extension table 2 by the hydraulic push rod 6, the mold workpiece 4 will contact the connecting plate 13. The connecting plate 13 moves towards the front end of the extension table 2, and then drives the guide plate 12 to move synchronously. During the movement of the guide plate 12, the inclined surface of its surface will push the two L-shaped positioning blocks 9 closer to each other until the bottom end of the short handle of the L-shaped positioning block 9 is in contact with the top end of the mold workpiece 4 to reinforce the position of the mold workpiece 4.
[0025] The extension platform 2 is provided with a sliding groove, and a guide block is slidably installed in the sliding groove. The top of the guide block is welded to the connecting plate 13 to prevent the connecting plate 13 from shaking during movement.
[0026] The front end face of the core-making machine body 1 is provided with a lifting groove 14, and a threaded rod 15 is provided in the lifting groove 14. A servo motor is installed on the bottom inner wall of the lifting groove 14. The bottom end of the output end of the servo motor is connected to the threaded rod 15 by screws. The bottom end of the threaded rod 15 is connected to the bottom inner wall of the lifting groove 14 by a bearing. How the servo motor drives the threaded rod 15 to rotate is a common existing technology, which will not be described in detail here. A support plate 16 is movably fitted on the outer wall of the threaded rod 15. The width of the support plate 16 is the same as the width of the lifting groove 14, so that during the rotation of the threaded rod 15, the support plate 16 moves vertically upward through the restriction of the lifting groove 14 and fits against the bottom end of the extension table 2, so that the extension table 2 can be kept in a horizontal state to support the mold workpiece 4.
[0027] An extension seat 8 is welded and fixed to the front end face of the core-making machine body 1. A second translation groove 17 is opened at the top of the extension seat 8. A matching sliding seat 18 is slidably installed in the second translation groove 17. A threaded groove is opened at the top of the sliding seat 18. A support screw 19 is installed in the threaded groove. When the sliding seat 18 slides to the inner wall of the back side of the second translation groove 17, the support screw 19 is screwed to make it fit against the top of the support plate 16, which can provide support for the support plate 16 and prevent it from bending.
[0028] To further clarify, the aforementioned fixed connection should be interpreted broadly unless otherwise explicitly specified and limited. For example, it may be welding, gluing, or integral molding, or other conventional methods well known to those skilled in the art.
[0029] A core-making method for an automatic core-making device for casting ductile iron manhole covers includes the following steps: S1: After the core-making machine body 1 completes the processing of the sand core, the hydraulic push rod 6 is activated to move the mold workpiece 4 to the top of the extension table 2 under the guidance of the slide rail 5, so as to carry out the subsequent chip blowing operation.
[0030] S2: During the process of the mold workpiece 4 moving to the top of the extension table 2, the mold workpiece 4 will contact the connecting plate 13. The connecting plate 13 and the guide plate 12 will move synchronously to the front end face of the extension table 2. During the displacement, the inclined surface of the guide plate 12 will push the two L-shaped positioning blocks 9 to move closer to each other, so that the short handle ends of the two L-shaped positioning blocks 9 will fit against the top of the mold workpiece 4 to reinforce it.
[0031] S3: Controls the rotation of threaded rod 15 (e.g.) Figure 2 As shown), the pallet 16 moves vertically downward under the restriction of the lifting groove 14. At this time, the extension table 2 will rotate through the rotating shaft 3 because it loses the support of the pallet 16, causing the mold workpiece 4 on the extension table 2 to tilt, causing a large number of debris on the mold workpiece 4 to fall off by itself. Then, a small amount of residual debris can be blown out by the air gun.
[0032] S4: Then, by reversing the threaded rod 15, the support plate 16 moves upward, and the extension table 2 is reset to a horizontal state. Then, the mold workpiece 4 is pushed into the processing cavity of the core making machine body 1 to continue processing.
[0033] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and inventive concept of this application, should be included within the scope of protection of this application.
Claims
1. An automatic core-making device for sand cores used in casting ductile iron manhole covers, characterized in that, The device includes a core-making machine body (1), the front end face of which is provided with a processing cavity, and a rotating shaft (3) is rotatably mounted on the front end face of the core-making machine body (1). The extension table (2) is fixed to the front end face of the rotating shaft (3). The top end of the extension table (2) and the bottom end of the inner cavity of the processing cavity are on the same horizontal plane. Both of them have two slide rails (5) on the same axis. The mold workpiece (4) is slidably mounted on the top of the slide rail (5) by a slider; A hydraulic push rod (6) is fixed to the front end face of the extension table (2). The output end of the hydraulic push rod (6) is connected to the mold workpiece (4) and is used to drive the mold workpiece (4) to move along the slide rail (5) between the processing cavity and the extension table (2). The top of the extension platform (2) is also provided with two first translation grooves (7). A slider is slidably installed in the first translation groove (7). An L-shaped positioning block (9) is welded and fixed to the top of the slider. The bottom of the short handle end of the L-shaped positioning block (9) is at the same level as the top of the mold workpiece (4). A reset spring (10) is provided in the first translation groove (7). Guide rods (11) are fixed on the left and right side walls of the core making machine body (1). Guide plates (12) are movably fitted on the outer walls of the two guide rods (11). The front ends of the two guide plates (12) are connected to a connecting plate (13).
2. The automatic core-making equipment for casting ductile iron manhole covers according to claim 1, characterized in that, The front end face of the core making machine body (1) is provided with a lifting groove (14), and a threaded rod (15) is provided in the lifting groove (14). A servo motor is installed on the bottom inner wall of the lifting groove (14). The output end of the servo motor is connected to the threaded rod (15). A support plate (16) is movably fitted on the outer wall of the threaded rod (15). The top of the support plate (16) can fit against the bottom of the extension table (2).
3. The automatic core-making equipment for casting ductile iron manhole covers according to claim 1, characterized in that, The front end face of the core making machine body (1) is fixed with an extension seat (8). The top end of the extension seat (8) is provided with a second translation groove (17). A sliding seat (18) is slidably installed in the second translation groove (17). The top end of the sliding seat (18) is provided with a threaded groove. A support screw (19) is installed in the threaded groove.
4. The automatic core-making equipment for casting ductile iron manhole covers according to claim 1, characterized in that, The extension platform (2) is provided with a sliding groove, and a guide block is slidably installed in the sliding groove. The top of the guide block is fixedly connected to the connecting plate (13).
5. The automatic core-making equipment for casting ductile iron manhole covers according to claim 2, characterized in that, The width of the pallet (16) is the same as the width of the lifting groove (14), ensuring that the pallet (16) can move vertically up and down.
6. The automatic sand core making apparatus for a ductile iron manhole cover casting according to claim 1, wherein The two guide plates (12) are both set as inclined surfaces on the side that is close to each other, and the inclined surfaces are in close contact with the L-shaped positioning block (9) to guide the displacement of the two guide plates (12).
7. The automatic core-making equipment for casting ductile iron manhole covers according to claim 1, characterized in that, The connecting plate (13) has a through hole for the output end of the hydraulic push rod (6) to pass through, so as to avoid affecting the operation of the hydraulic push rod (6).
8. An automatic core-making method for sand cores used in casting ductile iron manhole covers, implemented using the equipment described in any one of claims 1-7, characterized in that, Includes the following steps: S1: After the core making machine body (1) completes the processing of the sand core, the hydraulic push rod (6) is activated to move the mold workpiece (4) to the top of the extension table (2) under the guidance of the slide rail (5) so as to carry out subsequent chip blowing operation. S2: During the process of the mold workpiece (4) moving to the top of the extension table (2), the mold workpiece (4) will contact the connecting plate (13). The connecting plate (13) and the guide plate (12) will move synchronously to the front end face of the extension table (2). During the displacement, the inclined surface of the guide plate (12) will push the two L-shaped positioning blocks (9) closer to each other, so that the short handle ends of the two L-shaped positioning blocks (9) will fit against the top of the mold workpiece (4) to reinforce it. S3: Control the threaded rod 15 to rotate clockwise, so that the pallet (16) moves vertically downward under the restriction of the lifting groove (14). At this time, the extension table (2) will rotate through the rotating shaft (3) because it loses the support of the pallet (16), causing the mold workpiece (4) on the extension table (2) to tilt, so that a large number of debris on the mold workpiece (4) falls off by itself, and then a small amount of residual debris is blown out by the air gun. S4: Then, by reversing the threaded rod (15), the pallet (16) moves upward, and the extension table (2) is reset to a horizontal state. Then, the mold workpiece (4) is pushed into the processing cavity of the core making machine body (1) for further processing.