A shaped sand core box for sand core mold manufacturing

Abstract

The present application belongs to the technical field of sand core mold manufacturing and forming technology, and provides a forming sand core box for sand core mold manufacturing, which comprises split core box outer mold bodies, a peripheral frame, linear pushing devices and core box inner mold bodies; a plurality of split core box outer mold bodies are arranged on the inner side of the peripheral frame, and the split core box outer mold bodies are respectively connected with the linear pushing devices; the core box inner mold bodies are arranged on the inner side of the peripheral frame; when the split core box outer mold bodies are folded, the split core box outer mold bodies jointly form the structure of the core box outer mold body, and an annular mold cavity is formed between the inner side surface of the core box outer mold body and the outer side surface of the core box inner mold body; the inner side surface of the split core box outer mold body is provided with forming lines, which are used for forming corresponding lines on the outer side surface of the sand core mold. The split split-open structure is adopted, and split core box outer mold bodies with different sizes and different forming lines are adopted to adapt to various processing requirements.

Description

Technical Field

[0001] This invention belongs to the field of sand core mold manufacturing technology, and specifically relates to a molded sand core box for sand core mold manufacturing. Background Technology

[0002] Sand casting is a metal forming process that produces castings in sand molds. Liquid metal is poured into the cavity of the sand mold, and after cooling and solidification, a metal part blank is obtained. This process is applicable to steel, iron, and most non-ferrous alloys, and can manufacture castings with complex shapes and internal cavity structures. It is characterized by its high adaptability and low cost. A sand core mold is a specialized mold used in sand casting. It uses inner and outer mold bodies to form a cavity that matches the shape of the product and creates pre-set patterns on the product surface.

[0003] A sand core box is a forming tooling used to prepare sand core molds. Specific sand core molds are typically created by sandblasting and extrusion within the sand core box. Existing sand core boxes are often one-piece structures. If only a small area of ​​the product's outer surface texture is changed, a new mold needs to be made. This results in similar casting products often requiring multiple sets of specific sand core molds, and consequently, multiple sand core boxes, leading to a surge in costs and making it unsuitable for flexible production. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a molded sand core box for manufacturing sand core molds, thereby addressing the issues in the prior art. The technical solution adopted by the present invention is as follows: A molded sand core box for manufacturing sand core molds includes a split outer mold body, an outer frame, a linear pushing device, and an inner mold body. Multiple split-type core box outer molds are provided on the inner side of the outer frame, and the multiple split-type core box outer molds are respectively connected to the linear pushing device. The core box inner mold is provided on the inner side of the outer frame. Multiple split-type core box outer molds are arranged around the core box inner mold. The linear pushing device is used to push the split-type core box outer molds to move, so that the multiple split-type core box outer molds can be closed or separated. When the multiple split-type core box outer molds are closed, they together form the structure of the core box outer mold. An annular cavity is formed between the inner side surface of the core box outer mold and the outer side surface of the core box inner mold. The annular cavity is used for sandblasting to produce a sand core mold; the sand core mold is an inner mold. The inner surface of the split core box outer mold is provided with molding patterns to form corresponding patterns on the outer surface of the sand core mold.

[0005] Furthermore, the outer side of the split core box outer mold is detachably connected to a mounting plate for replacing the split core box outer mold of different sizes; The outer side of the mounting plate is fixedly connected to an elastic component; the output end of the linear pushing device is fixedly connected to a push rod, the end of the push rod is fixedly connected to a pressure plate, and the pressure plate abuts against the elastic component; One end of the guide rod is fixedly connected to the outer side of the mounting plate, and the other end of the guide rod can slide through the outer frame; a reset spring is provided on the guide rod to push the guide rod and the split core box outer mold body to reset.

[0006] Furthermore, a fixed plate is fixedly connected to the linear push device, the guide rod slidably passes through the fixed plate, and an adjusting bolt is provided at one end of the guide rod passing through the fixed plate; the reset spring is provided between the adjusting bolt and the fixed plate, and is used to push the multiple split core box outer molds to separate and reset.

[0007] Furthermore, a limiting ring plate is provided at the bottom of the annular mold cavity. The limiting ring plate is sleeved on the inner mold body of the core box. The inner side of the bottom of the split core box outer mold body is provided with a notch that matches the limiting ring plate. When multiple split core box outer mold bodies are closed, the notch engages with the limiting ring plate.

[0008] Furthermore, a support base is fixedly connected to the bottom of the outer frame, and a support frame is fixedly connected to the bottom of the support base. The support base is provided with a through hole to accommodate the limiting ring plate. A driving component is provided at the bottom of the support base. The driving component is connected to the bottom of the inner mold body of the core box and the bottom of the limiting ring plate. It is used to drive the inner mold body of the core box to descend and the limiting ring plate to rise, so that the inner mold body of the core box moves relative to the sand core mold for demolding.

[0009] Furthermore, the drive assembly includes a cylinder, a push rod, a pressing piston, hydraulic oil, and a side oil chamber; The bottom of the inner mold body of the core box is detachably connected to the pressing piston, and the pressing piston is disposed in the cylinder body; the hydraulic oil is disposed below the pressing piston and inside the cylinder body; The side oil chamber is provided inside the side of the cylinder block, the bottom of the push rod is slidably disposed in the side oil chamber, and the top of the push rod is fixedly connected to the bottom of the limiting ring plate; The downward piston is used to push hydraulic oil into the side oil chamber under its own weight when the mold body in the core box descends, so that the push rod pushes the limiting ring plate to rise.

[0010] Furthermore, the cylinder body is connected to an input pipe and an output pipe. The input pipe is connected to a hydraulic input device, which is used to input hydraulic oil to raise the mold body inside the core box. The output pipe is connected to the side oil chamber. An input control valve is provided on the input pipe, and an output control valve is provided on the output pipe.

[0011] Furthermore, the bottom of the push rod is fixedly connected to a rising piston, which divides the side oil chamber into upper and lower chambers. The upper chamber is equipped with a first spring sleeved on the push rod, and the lower chamber is equipped with a limiting block and hydraulic oil. The limiting block is used to limit the downward stroke of the rising piston.

[0012] Furthermore, it also includes an intermediate oil tank, a second spring, and a transmission piston; The support base is fixedly connected to the intermediate oil tank at its bottom. The transmission piston is installed inside the intermediate oil tank. A second spring is installed on the top of the transmission piston. The space below the transmission piston is used to accommodate hydraulic oil. The output pipe, intermediate connecting pipe, and return oil pipe are connected below the transmission piston and inside the intermediate oil tank. The intermediate connecting pipe is connected to the side oil chamber. The return oil pipe is connected to the return oil tank. The return oil tank is connected to the hydraulic input device. A return oil control valve is installed on the return oil pipe.

[0013] Furthermore, the sand core mold after demolding is hoisted and transported by a hoisting and conveying assembly; the hoisting and conveying assembly includes a suspended conveying device, a winch, and a clamping fixture; the winch is installed at the moving end of the suspended conveying device, and the hoisting rope of the winch is connected to the clamping fixture; the clamping fixture is used to insert into the top opening of the sand core mold and connect to the sand core mold. The clamping fixture includes a connecting block, a rotating block, a screw, a threaded sleeve, a lifting block, a rope, an eccentric locking block, and a stop block; The connecting block is fixedly connected to the hoisting rope, the bottom of the connecting block is rotatably connected to the rotating block, the bottom of the rotating block is fixedly connected to the screw, and the screw is threadedly connected to the threaded sleeve; the bottom of the screw is rotatably connected to the lifting block, and the bottom of the lifting block is connected to the eccentric locking block through the rope. The threaded sleeve has an opening on its bottom side, and the bottom of the eccentric locking block is rotatably connected inside the opening. The lifting block is located above the eccentric locking block, and the rope is fixedly connected to the inner side of the eccentric locking block. The stop block is detachably connected to the outer side of the bottom of the threaded sleeve and is located below the eccentric locking block. Multiple eccentric locking blocks are arranged around the circumference of the threaded sleeve. When the lifting block descends, the plurality of eccentric locking blocks unfold and are limited by the stop block; when the lifting block rises, the plurality of eccentric locking blocks return to the opening through the rope. The sand core mold has a stepped structure inside, including a small-diameter section and a large-diameter section. The small-diameter section is located at the top. The bottom of the threaded sleeve and the eccentric locking block are used to pass through the small-diameter section, and a limiting structure that abuts the bottom surface of the small-diameter section is formed by multiple eccentric locking blocks.

[0014] The present invention has the following beneficial effects: This invention employs a split-type opening and closing outer mold structure, disassembling the molding surface onto multiple split-type core box outer molds. Molding and demolding are achieved through radial movement and opening / closing, solving the problem of difficult processing of the inner surface texture of the product. When similar products differ only in a certain area, the corresponding split-type core box outer mold can be replaced to adapt the molding without having to re-mold the entire core box. At the same time, by using split-type core box outer molds of different sizes and molding textures, irregular surfaces, non-uniform surfaces, and other shapes of the product can be processed as needed, adapting to various processing requirements. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure; Figure 2 It is a top view; (a) in the figure is a schematic diagram of a split core box outer mold body when separated; (b) is a schematic diagram of the split core box outer mold body when closed; Figure 3 This is a schematic diagram of one implementation method for installing the outer mold of a split core box; Figure 4 This is a schematic diagram of another implementation method of the split core box outer mold body installation method, and also a schematic diagram of the sand core forming process. Figure 5 This is a diagram showing the connection relationship of the mounting plates; Figure 6 This is a schematic diagram of the driver component; Figure 7 This is a schematic diagram after the sand core mold has been lifted. Figure 8 This is a schematic diagram of the conveyor components being lifted. Figure 9 This is a schematic diagram of the clamping fixture; (a) in the figure is a schematic diagram when the eccentric clamping block is closed; (b) is a schematic diagram when the eccentric clamping block is unfolded. In the diagram: 1-Split core box outer mold body, 2-Outer frame, 3-Linear push device, 4-Guide rod, 5-Support base, 6-Core box inner mold body, 7-Annular mold cavity, 8-Fixing plate, 9-Support frame, 10-Limiting ring plate, 11-Drive assembly, 12-Sand core mold, 13-Plug-in plate, 14-Mounting plate, 15-Clamping fixture, 16-Winder, 17-Suspended conveying device, 18-Hanging rope, 101-Heating hole, 102-Forming texture, 301-Push rod, 302-Housing, 303-Elastic component, 304-Pressure plate, 401-Reset spring, 402-Adjusting bolt, 110-Cylinder body, 111-Hydraulic oil, 11 2-Top rod, 113-Side oil chamber, 114-First spring, 115-Rising piston, 116-Limit block, 117-Pressing piston, 118-Intermediate oil tank, 119-Second spring, 1110-Transmission piston, 1111-Return oil control valve, 1112-Return oil pipe, 1113-Intermediate connecting pipe, 1114-Input control valve, 1115-Input pipe, 1116-Output pipe, 1117-Output control valve, 1118-Stroke limit block, 151-Connecting block, 152-Rotating block, 153-Screw, 154-Threaded sleeve, 155-Lifting block, 156-Rope, 157-Eccentric locking block, 158-Stop block. Detailed Implementation

[0016] The following will be based on embodiments of the present invention. Figures 1-9 The technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Unless otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art.

[0017] like Figures 1-2 A molded sand core box for manufacturing sand core molds includes a split-type outer mold body 1, an outer frame 2, a linear pushing device 3, and an inner mold body 6. Multiple split-type core box outer molds 1 are provided on the inner side of the outer frame 2, and the multiple split-type core box outer molds 1 are respectively connected to the linear push device 3. The core box inner mold 6 is provided on the inner side of the outer frame 2. Multiple split-type core box outer mold bodies 1 are arranged around the core box inner mold body 6. The linear pushing device 3 is used to push the split-type core box outer mold bodies 1 to move, so that the multiple split-type core box outer mold bodies 1 can close or separate. When the multiple split-type core box outer mold bodies 1 are closed, they together form the structure of the core box outer mold body. An annular mold cavity 7 is formed between the inner side surface of the core box outer mold body and the outer side surface of the core box inner mold body 6. The annular cavity 7 is used for sandblasting to produce the sand core mold 12; the sand core mold 12 is an inner mold. The inner side of the split core box outer mold 1 is provided with molding texture 102, which is used to form corresponding texture on the outer side of the sand core mold 12.

[0018] Before processing the sand core mold, all linear pushing devices 3 push multiple split-type outer mold bodies 1 towards the central inner mold body 6 of the core box until the multiple split-type outer mold bodies 1 fit together tightly to form a complete outer mold body of the core box. An annular mold cavity 7 with an open top and closed bottom is formed between the inner wall of the outer mold body of the core box and the outer wall of the inner mold body 6. Then, high-temperature sand cores are injected into the annular mold cavity 7 through equipment such as sandblasting machines and sandblasting and compaction are performed. Through the forming texture 102 on the inner wall of the split-type outer mold body 1, a corresponding texture structure is formed on the sand core mold 12. After cooling and forming, the linear pushing device 3 drives each split-type outer mold body 1 to separate outward and detach from the outer surface of the sand core mold 12, completing the mold opening and obtaining the complete sand core mold 12.

[0019] The linear actuator 3 is existing technology, such as a servo cylinder, hydraulic cylinder, electric push rod, servo motor lead screw structure, etc.; the sand core mold 12 serves as the inner mold for subsequent casting and needs to be used in conjunction with the outer mold. The cast product is a hollow cylindrical structure; the sand core mold 12 of this invention is a hollow cylindrical structure, used to form corresponding patterns on the inner surface of the product. The forming pattern 102 of this invention can be of various shapes, such as spiral patterns, uneven concave-convex structures, convex structures, wave structures, etc.

[0020] This invention employs a split-type opening and closing outer mold structure, dividing the molding surface onto multiple split-type core box outer molds 1. Molding and demolding are achieved through radial movement and opening / closing, solving the problem of difficult processing of the texture on the inner surface of the product. When similar products differ only in a certain area, the corresponding split-type core box outer mold 1 can be replaced to adapt the molding without having to re-mold the entire core box. At the same time, by using split-type core box outer molds 1 of different sizes and different molding textures 102, irregular surfaces, non-uniform surfaces, and other shapes of the product can be processed as needed, adapting to various processing requirements.

[0021] In addition, the outer mold body 1 of the split core box is provided with a heating hole 101, and a heating rod can be inserted into the heating hole 101 to achieve heating, which facilitates temperature adjustment and promotes sand core forming.

[0022] The installation method of the split core box outer mold body 1 of the present invention includes at least two embodiments: like Figures 4-5 The outer side of the split core box outer mold 1 is detachably connected to the mounting plate 14 for replacing the split core box outer mold 1 of different sizes; The outer side of the mounting plate 14 is fixedly connected to the elastic component 303; the output end of the linear pushing device 3 is fixedly connected to the push rod 301, the end of the push rod 301 is fixedly connected to the pressure plate 304, and the pressure plate 304 abuts against the elastic component 303. One end of the guide rod 4 is fixedly connected to the outer side of the mounting plate 14, and the other end of the guide rod 4 can slide through the outer frame 2; a reset spring 401 is provided on the guide rod 4 to push the guide rod 4 and the split core box outer mold 1 to reset.

[0023] The linear pusher 3 is fixedly connected to a fixing plate 8. The guide rod 4 slidably passes through the fixing plate 8. An adjusting bolt 402 is provided at one end of the guide rod 4 that passes through the fixing plate 8. The reset spring 401 is provided between the adjusting bolt 402 and the fixing plate 8 and is used to push the multiple split core box outer molds 1 to separate and reset.

[0024] The elastic component 303 can be a spring, rubber, or other similar material. The elastic component 303 is housed within the housing 302, enabling its installation. The housing 302 is fixedly connected to the outer side of the mounting plate 14. Figure 5 The mounting plate 14 can be an I-shaped structure. A connector plate 13 is fixedly connected to the outer side of the split-type core box outer mold 1. The connector plate 13 has a groove adapted to the I-shaped structure of the mounting plate 14. By aligning the connector plate 13 with the mounting plate 14, different split-type core box outer molds 1 can be removed and replaced by moving the split-type core box outer mold 1 up and down. During mold closing, the linear push device 3 drives the push rod 301, and the pressure plate 304 compresses the elastic component 303. The elastic component 303 pushes the split-type core box outer mold 1 towards the center through the mounting plate 14. The return spring 401 is compressed by the adjusting bolt 402, and the bottom surface of the split-type core box outer mold 1 slides on the support base 5. When the split-type core box outer mold 1 separates, the linear push device 3 retracts, and the return spring 401 pushes the adjusting bolt 402 outward, thereby moving the split-type core box outer mold 1 outward to separate. The return force and separation position can be adjusted by rotating the adjusting bolt 402. In this embodiment, the elastic component 303 ensures the clamping force of the split core box outer mold body 1 during mold closing; the method of using up-and-down sliding to pick up and put down the split core box outer mold body 1 makes replacement more convenient. This embodiment is a preferred embodiment of the present invention.

[0025] like Figures 1-3In another embodiment of the installation method of the split core box outer mold body 1, the output end of the linear push device 3 is fixedly connected to the push rod 301. The end of the push rod 301 can be detachably connected to the outer side of the split core box outer mold body 1 by bolts. Furthermore, the outer side of the split core box outer mold body 1 is fixedly connected to the guide rod 4, which can slide through the fixing plate 8 fixed on the linear push device 3. This embodiment has a simpler structure and lower cost.

[0026] like Figure 4 The bottom of the annular cavity 7 is provided with a limiting ring plate 10, which is sleeved on the inner mold body 6 of the core box. The bottom inner side of the split core box outer mold body 1 is provided with a notch that matches the limiting ring plate 10. When multiple split core box outer mold bodies 1 are closed, the notch engages with the limiting ring plate 10 to form a limiting function. Multiple notches form a uniform cylindrical surface.

[0027] During the mold closing process, the split core box outer mold body 1 closes towards the center, and the bottom notch gradually approaches and fits onto the outer edge of the limiting ring plate 10. After it is in place, the notch of the split core box outer mold body 1 together forms a complete cylindrical surface, which fits against the outer circle of the limiting ring plate 10 to form a limiting structure.

[0028] like Figure 4 , Figures 6-7 Because the temperature of the sand core mold 12 and the inner mold body 6 of the core box is very high after the sand core mold 12 is formed, and the inner side of the sand core mold 12 is attached to the inner mold body 6 of the core box, the existing technology often uses a machine to clamp the sand core mold 12 to remove it for demolding. However, this clamping demolding method is easy to damage the outer surface of the sand core mold 12, especially the sand core mold 12 with the molding texture 102 on the outer surface of the present invention. In order to solve this problem, the present invention designs a driving component 11 to perform demolding directly at the molding station, protecting the molding texture 102 while reducing the transfer of the sand core mold 12.

[0029] Specifically, the bottom of the outer frame 2 is fixedly connected to the support base 5, the bottom of the support base 5 is fixedly connected to the support frame 9, and the support base 5 is provided with a through hole to accommodate the limiting ring plate 10; The bottom of the support base 5 is provided with a driving component 11, which is connected to the bottom of the core box inner mold 6 and the bottom of the limiting ring plate 10. The driving component 11 is used to drive the core box inner mold 6 to descend and the limiting ring plate 10 to rise, so that the core box inner mold 6 moves relative to the sand core mold 12 for demolding.

[0030] After the sand core mold 12 is formed, the split-type core box outer mold 1 separates, and the drive assembly 11 starts, driving the core box inner mold 6 to move downward and the limiting ring plate 10 to lift upward. The core box inner mold 6 is ejected downward from the inside of the sand core mold 12, while the limiting ring plate 10 pushes the sand core mold 12 upward as a whole, so that the sand core mold 12 and the core box inner mold 6 are detached from the attached state, completing the demolding. This invention adopts a bidirectional axial demolding method to avoid the molding texture 102 being clamped and damaged, and the bidirectional movement can reduce demolding resistance and improve demolding efficiency. After demolding, the top of the sand core mold 12 is higher than the split-type core box outer mold 1 and the core box inner mold 6, and the sand core mold 12 can be removed by a hoisting device for easy movement, eliminating the need for demolding at other workstations.

[0031] like Figure 6 The drive assembly 11 includes a cylinder 110, a push rod 112, a pressing piston 117, hydraulic oil 111, and a side oil chamber 113; The bottom of the inner mold body 6 of the core box is detachably connected to the pressing piston 117, which is disposed inside the cylinder body 110; the hydraulic oil 111 is disposed below the pressing piston 117 and inside the cylinder body 110. The side oil chamber 113 is provided inside the side of the cylinder body 110, the bottom of the push rod 112 is slidably disposed in the side oil chamber 113, and the top of the push rod 112 is fixedly connected to the bottom of the limiting ring plate 10. The downward piston 117 is used to push hydraulic oil 111 into the side oil chamber 113 under its own weight when the inner mold body 6 of the core box descends, so that the push rod 112 pushes the limiting ring plate 10 to rise.

[0032] The bottom of the inner mold body 6 of the core box can be connected to the pressing piston 117 by bolts, pins, etc. The inner mold body 6 of the core box is made of solid metal, and its own weight is sufficient to provide downward pressure for the pressing piston 117. During demolding, the inner mold body 6 of the core box, under its own weight, drives the pressing piston 117 to slide downward along the cylinder 110; the pressing piston 117 squeezes the hydraulic oil 111 below, so that the hydraulic oil 111 flows from the cylinder 110 into the side oil chamber 113; the oil pressure pushes the push rod 112 to move upward along the side oil chamber 113, thereby driving the limiting ring plate 10 to rise upward, realizing the bidirectional demolding action.

[0033] Furthermore, the cylinder body 110 is connected to an input pipe 1115 and an output pipe 1116. The input pipe 1115 is connected to a hydraulic input device, which is used to input hydraulic oil 111 to raise the inner mold body 6 of the core box. The output pipe 1116 is connected to the side oil chamber 113. An input control valve 1114 is provided on the input pipe 1115, and an output control valve 1117 is provided on the output pipe 1116.

[0034] The hydraulic input device is existing technology, such as a hydraulic pump. A stroke limit block 1118 can be set inside the cylinder 110 to constrain the stroke of the pressing piston 117, so that the mold body 6 inside the core box is at the designed height, ensuring the forming requirements of the sand core mold 12.

[0035] Furthermore, the bottom of the push rod 112 is fixedly connected to the rising piston 115. The rising piston 115 divides the side oil chamber 113 into upper and lower chambers. The upper chamber is equipped with a first spring 114 sleeved on the push rod 112, and the lower chamber is equipped with a limiting block 116 and hydraulic oil 111. The limiting block 116 is used to limit the downward stroke of the rising piston 115, and the upward stroke of the rising piston 115 is limited by the top surface of the side oil chamber 113. The cylinder body 110 is provided with a sliding hole located above and communicating with the side oil chamber 113. The sliding hole and the side oil chamber 113 together form a stepped hole structure. The inner diameter of the side oil chamber 113 is larger than the inner diameter of the sliding hole. The sliding hole is used for the push rod 112 to pass through, while the stepped portion on the top surface of the side oil chamber 113 is used to limit the upward stroke of the rising piston 115.

[0036] When the rising piston 115 descends to its lowest position, it abuts against the limiting block 116. At this time, the limiting ring plate 10 is located at the bottom of the annular mold cavity 7. This is the working position of the limiting ring plate 10 during the sandblasting process of the annular mold cavity 7. When the rising piston 115 rises to its highest position, it abuts against the top surface of the side oil cavity 113. At this time, the limiting ring plate 10 rises, lifting the sand core mold 12 after processing, which facilitates demolding and movement.

[0037] The first spring 114 is preferably always in a compressed state. During sandblasting, the first spring 114 presses against the rising piston 115, keeping the push rod 112 and the limiting ring plate 10 in a low working position. During demolding, the hydraulic oil 111 pushes the rising piston 115 to further compress the first spring 114. During the reset phase, the hydraulic oil 111 is released, and the first spring 114 rebounds to push the rising piston 115 down, returning to the low working position.

[0038] Furthermore, it also includes an intermediate oil tank 118, a second spring 119, and a transmission piston 1110; The support base 5 is fixedly connected to the intermediate oil tank 118 at its bottom. The intermediate oil tank 118 is equipped with the transmission piston 1110. The transmission piston 1110 is equipped with a second spring 119 at its top. The space below the transmission piston 1110 is used to accommodate hydraulic oil 111. The output pipe 1116, the intermediate connecting pipe 1113, and the return oil pipe 1112 are connected below the transmission piston 1110 and inside the intermediate oil tank 118. The intermediate connecting pipe 1113 is connected to the side oil chamber 113, and the return oil pipe 1112 is connected to the return oil tank. The return oil tank is connected to the hydraulic input device. The return oil pipe 1112 is equipped with a return oil control valve 1111.

[0039] Figure 6 In the middle, the input tube 1115 on the right side blocks the output tube 1116 due to overlapping viewpoints. This is understandable. Figure 6 The output tube 1116 on the right side is located behind the input tube 1115.

[0040] During the molding process of this invention, the output control valve 1117, input control valve 1114, hydraulic input device, and return oil control valve 1111 are closed. The inner mold body 6 and the limiting ring plate 10 of the core box are in the working position, such as... Figure 4 As shown. Corresponding limiting protrusions, limiting blocks or sliding keys can be provided on the upper and lower sides of the transmission piston 1110 to constrain the up and down movement stroke of the transmission piston 1110.

[0041] During demolding, the output control valve 1117 is opened, while the input control valve 1114, hydraulic input device, and return oil control valve 1111 remain closed. The downward piston 117 descends due to its own weight, compressing the hydraulic oil 111 and causing it to flow into the side oil chamber 113 through the output pipe 1116. This drives the push rod 112 to rise, forming... Figure 7 The state in.

[0042] During reset, the output control valve 1117 is first closed, the input control valve 1114 and the hydraulic input device are opened, and the return oil control valve 1111 remains closed. The hydraulic input device (not shown in the figure) draws hydraulic oil 111 from the return oil tank and inputs hydraulic oil 111 into the cylinder 110 through the input pipe 1115, pushing the downward piston 117 to move upward, causing the mold body 6 inside the core box to rise and abut against the stroke limit block 1118, thereby returning to the working height. Figure 4 The height of the core box is as follows. The inner mold body 6 is in place, the input control valve 1114 and the hydraulic input device are closed, the output control valve 1117 is kept closed, and the return oil control valve 1111 is opened. At this time, the first spring 114 and the second spring 119 release their elastic force, the transmission piston 1110 and the rising piston 115 descend to the working position, and the hydraulic oil 111 flows back to the return oil tank (not shown in the figure).

[0043] In this invention, multiple intermediate oil tanks 118 can be arranged around the cylinder body 110, or only one can be arranged. The function of the intermediate oil tank 118 is to buffer excess oil pressure and balance the oil volume in the intermediate oil tank 118, the cylinder body 110, and the side oil chamber 113.

[0044] In this invention, since the sand core mold 12 and the inner mold body 6 of the core box are at very high temperatures after the sand core mold 12 is formed, a clamping fixture 15 is designed to facilitate the transfer of the sand core mold 12, which is used for manual non-contact hoisting of the sand core mold 12.

[0045] like Figures 8-9The sand core mold 12, after demolding, is hoisted and transported by a hoisting and conveying assembly. The hoisting and conveying assembly includes a suspended conveying device 17, a winch 16, and a clamping fixture 15. The winch 16 is installed at the moving end of the suspended conveying device 17, and the hoisting rope 18 of the winch 16 is connected to the clamping fixture 15. The clamping fixture 15 is used to insert into the top opening of the sand core mold 12 and connect to the sand core mold 12. The clamping fixture 15 includes a connecting block 151, a rotating block 152, a screw 153, a threaded sleeve 154, a lifting block 155, a rope 156, an eccentric locking block 157, and a stop block 158. The connecting block 151 is fixedly connected to the suspension rope 18. The bottom of the connecting block 151 is rotatably connected to the rotating block 152. The bottom of the rotating block 152 is fixedly connected to the screw 153. The screw 153 is threadedly connected to the threaded sleeve 154. The bottom of the screw 153 is rotatably connected to the lifting block 155. The bottom of the lifting block 155 is connected to the eccentric locking block 157 through the rope body 156. The threaded sleeve 154 has an opening on its bottom side, and the bottom of the eccentric locking block 157 is rotatably connected inside the opening. The lifting block 155 is located above the eccentric locking block 157, and the rope 156 is fixedly connected to the inner side of the eccentric locking block 157. The bottom outer side of the threaded sleeve 154 is detachably connected to the stop block 158, which is located below the eccentric locking block 157. Multiple eccentric locking blocks 157 are arranged circumferentially around the threaded sleeve 154. When the lifting block 155 descends, the plurality of eccentric locking blocks 157 unfold and are limited by the stop block 158; when the lifting block 155 rises, the plurality of eccentric locking blocks 157 are returned to the opening by the rope 156. The sand core mold 12 has a stepped structure inside, including a small-diameter part and a large-diameter part. The small-diameter part is located at the top. The bottom of the threaded sleeve 154 and the eccentric locking block 157 are used to pass through the small-diameter part, and the multiple eccentric locking blocks 157 unfold to form a limiting structure that abuts against the bottom surface of the small-diameter part.

[0046] After the sand core mold 12 is demolded, the suspended conveyor 17 moves the clamping fixture 15 to directly above the sand core mold 12. The winch 16 lowers the hoisting rope 18 so that the bottom of the clamping fixture 15 passes through the small diameter part of the top of the sand core. By manually rotating the rotating block 152, the screw 153 and the lifting block move downward. Multiple eccentric locking blocks 157 unfold outward around the bottom hinge point under the action of their center of gravity. When the bottom surface of the eccentric locking block 157 abuts against the stop block 158, it is fully unfolded, thus expanding the effective radius of the bottom of the clamping fixture 15. Then, during the upward movement of the clamping fixture 15, the eccentric locking block 157 abuts against the bottom surface of the small-diameter hole of the stepped hole of the sand core mold 12, forming an internal support limit. When the winch 16 lifts, the eccentric locking block 157 supports the sand core mold 12 to lift it. At this time, the sand core mold 12 has been separated from the inner mold body 6 of the core box, so it can be easily lifted without damaging the outer surface texture of the sand core mold 12. When the clamping fixture 15 is reset, the rotating block 152 is manually rotated to move the screw 153 and the lifting block upward. Multiple eccentric locking blocks 157 return to the opening under the pull of the rope 156, forming a nearly vertical state.

[0047] The eccentric locking block 157 can be designed with an "L"-shaped structure, with its center of gravity offset from the outside of the bottom hinge point, allowing it to swing outward under its own weight and be limited by the stop block 158. The stop block 158 can be connected to the outside of the threaded sleeve 154 via bolts or threads, located below the opening, and its position can be adjusted to adjust the maximum unfolding angle of the eccentric locking block 157. The lifting block 155 and the inner side of the threaded sleeve 154 can be fitted together using sliding keys, raised grooves, splines, etc., to constrain the lifting block 155 and prevent it from rotating. Handles can be provided on the rotating block 152 and the threaded sleeve 154 for easy gripping and rotation.

[0048] The clamping fixture 15 of the present invention adopts an internal support type hoisting, which can protect the outer surface of the sand core mold 12. The loading and unloading operation is simple. The eccentric snap-fit ​​block 157 can be adapted to sand core molds 12 with different hole diameters and different depths, and has strong versatility.

[0049] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Any modifications, alterations, substitutions, or variations made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A molded sand core box for manufacturing sand core molds, characterized in that, It includes a split core box outer mold (1), an outer frame (2), a linear push device (3), and a core box inner mold (6); Multiple split-type core box outer molds (1) are provided on the inner side of the outer frame (2), and the multiple split-type core box outer molds (1) are respectively connected to the linear push device (3). The core box inner mold (6) is provided on the inner side of the outer frame (2). Multiple split-type core box outer molds (1) are arranged around the core box inner mold (6). The linear pushing device (3) is used to push the split-type core box outer molds (1) to move, so that the multiple split-type core box outer molds (1) can close or separate. When the multiple split-type core box outer molds (1) are closed, they together form the structure of the core box outer mold. An annular cavity (7) is formed between the inner side of the core box outer mold and the outer side of the core box inner mold (6). The annular cavity (7) is used for sandblasting to produce a sand core mold (12); the sand core mold (12) is an inner mold. The inner side of the split core box outer mold body (1) is provided with molding texture (102) to form corresponding texture on the outer side of the sand core mold (12).

2. A molded sand core box for manufacturing sand core molds according to claim 1, characterized in that, The outer side of the split core box outer mold (1) can be detachably connected to the mounting plate (14) for replacing the split core box outer mold (1) of different sizes. The outer side of the mounting plate (14) is fixedly connected to the elastic component (303); the output end of the linear push device (3) is fixedly connected to the push rod (301), the end of the push rod (301) is fixedly connected to the pressure plate (304), and the pressure plate (304) abuts against the elastic component (303). One end of the guide rod (4) is fixedly connected to the outer side of the mounting plate (14), and the other end of the guide rod (4) can slide through the outer frame (2); a reset spring (401) is provided on the guide rod (4) to push the guide rod (4) and the split core box outer mold (1) to reset.

3. A molded sand core box for manufacturing sand core molds according to claim 2, characterized in that, The linear pusher (3) is fixedly connected to a fixing plate (8), and the guide rod (4) slides through the fixing plate (8). An adjusting bolt (402) is provided at one end of the guide rod (4) that passes through the fixing plate (8). The reset spring (401) is provided between the adjusting bolt (402) and the fixing plate (8) and is used to push the multiple split core box outer molds (1) to separate and reset.

4. A molded sand core box for manufacturing sand core molds according to claim 1, characterized in that, The bottom of the annular cavity (7) is provided with a limiting ring plate (10), which is sleeved on the inner mold body (6) of the core box. The bottom inner side of the split core box outer mold body (1) is provided with a notch that matches the limiting ring plate (10). When multiple split core box outer mold bodies (1) are closed, the notch is engaged with the limiting ring plate (10).

5. A molded sand core box for manufacturing sand core molds according to claim 4, characterized in that, The bottom of the outer frame (2) is fixedly connected to the support base (5), the bottom of the support base (5) is fixedly connected to the support frame (9), and the support base (5) is provided with a through hole to accommodate the limiting ring plate (10); The bottom of the support base (5) is provided with a driving component (11), which is connected to the bottom of the core box inner mold (6) and the bottom of the limiting ring plate (10). The driving component (11) is used to drive the core box inner mold (6) to descend and the limiting ring plate (10) to rise, so that the core box inner mold (6) moves relative to the sand core mold (12) to demold.

6. A molded sand core box for manufacturing sand core molds according to claim 5, characterized in that, The drive assembly (11) includes a cylinder (110), a push rod (112), a pressing piston (117), hydraulic oil (111), and a side oil chamber (113). The bottom of the inner mold body (6) of the core box is detachably connected to the pressing piston (117), and the pressing piston (117) is disposed inside the cylinder (110); the hydraulic oil (111) is disposed below the pressing piston (117) and inside the cylinder (110). The side oil chamber (113) is provided inside the side of the cylinder body (110), and the bottom of the push rod (112) is slidably disposed in the side oil chamber (113). The top of the push rod (112) is fixedly connected to the bottom of the limiting ring plate (10). The downward piston (117) is used to push hydraulic oil (111) into the side oil chamber (113) under its own weight when the inner mold (6) of the core box descends, so that the push rod (112) pushes the limiting ring plate (10) upward.

7. A molded sand core box for manufacturing sand core molds according to claim 6, characterized in that, The cylinder body (110) is connected to an input pipe (1115) and an output pipe (1116). The input pipe (1115) is connected to a hydraulic input device, which is used to input hydraulic oil (111) to make the inner mold body (6) of the core box rise. The output pipe (1116) is connected to the side oil chamber (113). An input control valve (1114) is provided on the input pipe (1115), and an output control valve (1117) is provided on the output pipe (1116).

8. A molded sand core box for manufacturing sand core molds according to claim 7, characterized in that, The bottom of the push rod (112) is fixedly connected to the rising piston (115). The rising piston (115) divides the side oil chamber (113) into upper and lower chambers. The upper chamber is provided with a first spring (114) sleeved on the push rod (112), and the lower chamber is provided with a limiting block (116) and hydraulic oil (111). The limiting block (116) is used to limit the downward stroke of the rising piston (115).

9. A molded sand core box for manufacturing sand core molds according to claim 8, characterized in that, It also includes an intermediate oil tank (118), a second spring (119), and a transmission piston (1110). The support base (5) is fixedly connected to the intermediate oil tank (118) at the bottom. The intermediate oil tank (118) is equipped with the transmission piston (1110). The transmission piston (1110) is equipped with a second spring (119) at the top. The space below the transmission piston (1110) is used to accommodate hydraulic oil (111). The output pipe (1116), the intermediate connecting pipe (1113), and the return oil pipe (1112) are connected below the transmission piston (1110) and inside the intermediate oil tank (118). The intermediate connecting pipe (1113) is connected to the side oil chamber (113). The return oil pipe (1112) is connected to the return oil tank. The return oil tank is connected to the hydraulic input device. The return oil pipe (1112) is equipped with a return oil control valve (1111).

10. A molded sand core box for manufacturing sand core molds according to claim 5, characterized in that, After demolding, the sand core mold (12) is hoisted and transported by a hoisting and conveying assembly; the hoisting and conveying assembly includes a suspended conveying device (17), a winch (16), and a clamping fixture (15); the winch (16) is installed at the moving end of the suspended conveying device (17), and the hoisting rope (18) of the winch (16) is connected to the clamping fixture (15); the clamping fixture (15) is used to insert into the top opening of the sand core mold (12) and connect to the sand core mold (12); The clamping fixture (15) includes a connecting block (151), a rotating block (152), a screw (153), a threaded sleeve (154), a lifting block (155), a rope (156), an eccentric snap-fit ​​block (157), and a stop block (158). The connecting block (151) is fixedly connected to the hoisting rope (18). The bottom of the connecting block (151) is rotatably connected to the rotating block (152). The bottom of the rotating block (152) is fixedly connected to the screw (153). The screw (153) is threadedly connected to the threaded sleeve (154). The bottom of the screw (153) is rotatably connected to the lifting block (155). The bottom of the lifting block (155) is connected to the eccentric locking block (157) through the rope body (156). The threaded sleeve (154) has an opening on its bottom side, and the bottom of the eccentric locking block (157) is rotatably connected inside the opening. The lifting block (155) is located above the eccentric locking block (157), and the rope (156) is fixedly connected to the inner side of the eccentric locking block (157). The bottom outer side of the threaded sleeve (154) is detachably connected to the stop block (158), and the stop block (158) is located below the eccentric locking block (157). Multiple eccentric locking blocks (157) are arranged around the threaded sleeve (154) circumferentially. When the lifting block (155) descends, the plurality of eccentric locking blocks (157) unfold and are limited by the stop block (158); when the lifting block (155) rises, the plurality of eccentric locking blocks (157) return to the opening through the rope (156). The sand core mold (12) has a stepped structure inside, including a small diameter part and a large diameter part. The small diameter part is located at the top. The bottom of the threaded sleeve (154) and the eccentric snap-fit ​​block (157) are used to pass through the small diameter part and are unfolded by multiple eccentric snap-fit ​​blocks (157) to form a limiting structure that abuts against the bottom surface of the small diameter part.

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