A two-station molding machine

Abstract

This invention relates to the field of mold manufacturing equipment technology, and provides a dual-station molding machine, which includes a sand adding device, a compaction device, and a conveying device for conveying sand boxes. The compaction device includes a frame, with a support frame at the top of the frame. A multi-contact mechanism is mounted on the support frame, and several tie rods are connected between the bottom of the frame and the support frame. The upper end of each tie rod is threadedly connected to a connector, and its end face abuts against the upper end of the support frame. A pull-and-tighten mechanism is located above the connector on the support frame. This mechanism is connected to the tie rods and can pull the tie rods upward. By setting the connector and the pull-and-tighten mechanism, the pull-and-tighten mechanism is pulled before installing the tie rods or before compaction, so that the tie rods generate pre-tightening force before bearing the force from the mold, entering a strengthening stage. This enhances the stability of the connection between the tie rods and the support frame, ensures that the tie rods can stably overcome the reaction force when compacting molding sand, and avoids insufficient rigidity of the frame. This solves the technical problem in the prior art where the tie rod connection causes elastic deformation of the tie rods under force, resulting in insufficient compaction force.

Description

Technical Field

[0001] This invention relates to the field of mold manufacturing equipment technology, specifically to a dual-station molding machine. Background Technology

[0002] A dual-station molding machine refers to a molding machine with two working positions: a sand-adding position and a compaction position. When creating large, complex models, a multi-touch compaction method is typically used. The multi-touch method can be referenced in multi-touch molding machines, and is driven pneumatically or hydraulically. During operation, numerous contacts simultaneously apply pressure to the molding sand in the sand box, achieving the compaction operation.

[0003] In existing technology, the contact drive device of a multi-contact molding machine is mounted on a support frame, which is connected to the machine's column by screws or tie rods. Tie rods, compared to screws, can withstand greater reaction force during compaction by the pressure head, and are therefore more commonly used in high-tonnage molding machines. The two ends of the tie rod are fixed to the support frame and the bottom support frame respectively by hooks, nuts, or pins. However, in actual use, during compaction by the pressure head of a high-tonnage molding machine, the tie rod connection is prone to elastic deformation, resulting in insufficient compressive force on the molding sand. Summary of the Invention

[0004] To overcome the above-mentioned defects, embodiments of the present invention provide a dual-station molding machine, which solves the technical problem that insufficient compressive strength is caused by elastic deformation of the tie rod under stress in the prior art.

[0005] According to one aspect, at least one embodiment of the present invention provides a dual-station molding machine, including a sand feeding device, a compaction device, and a conveying device for conveying a molding sand box between the two, said compaction device comprising:

[0006] The frame is equipped with a multi-contact mechanism and a molding sand box support mechanism located below the multi-contact mechanism;

[0007] A plurality of pull rods are provided, the upper ends of which are connected to the top of the frame and the lower ends of which are connected to the bottom of the frame. When the multi-contact mechanism presses down the molding sand in the molding sand box, the pull rods can pull down the top of the frame.

[0008] A connector is threaded to the upper end of the pull rod, and the lower end face of the connector can abut against the top of the frame.

[0009] A pre-tensioning mechanism is installed on the frame and connected to the upper end of the pull rod. The pre-tensioning mechanism is used to pull one end of the pull rod upward.

[0010] As a further technical solution, the pulling pre-tensioning mechanism includes:

[0011] A support frame is mounted on the frame body, the connector is located inside the support frame, and the tie rod passes through the top of the support frame;

[0012] A tensioning member is threaded onto the pull rod and located above the support frame. The tensioning member is threaded with several axially penetrating set screws, which are used to abut against the top of the support frame so that the tensioning member pulls the pull rod upward.

[0013] As a further technical solution, the side wall of the support frame has an adjustment opening through which a tool passes to turn the connector.

[0014] As a further technical solution, the molding sand box support mechanism includes:

[0015] A lifting support plate is mounted on the frame and is used to support the molding sand box. The bottom of the lifting support plate has a guide rod that passes through the frame and slides with the frame.

[0016] The top block is horizontally slidably mounted on the frame. The top block has a pushing slope, which is used to support the bottom of the guide rod.

[0017] As a further technical solution, a connecting frame is provided at the bottom of the frame. The connecting frame includes a connecting part suspended at the bottom of the frame and a supporting part provided at the bottom of the connecting part and extending horizontally. The top block is slidably disposed on the supporting part.

[0018] As a further technical solution, the top of the connecting part is also connected with several reinforcing ribs that are connected to the top of the frame.

[0019] As a further technical solution, the sand adding device includes:

[0020] A frame is disposed on one side of the frame body, and the conveying device is disposed on the frame;

[0021] A metering hopper is located at the top of the frame and above the conveying device. It is used to hold a metered amount of molding sand. The bottom of the metering hopper has a sand outlet, and the sand outlet is rotatably equipped with several flaps that can rotate to open the sand outlet.

[0022] As a further technical solution, the sand adding device also includes:

[0023] A lifting device is provided at the bottom of the frame, located below the conveying device, and is capable of lifting the molding sand box located on the conveying device up to the metering hopper.

[0024] As a further technical solution, the conveying device includes:

[0025] A mold bottom frame conveyor roller conveyor is installed on the frame and is used to convey the mold bottom frame to the sand adding device;

[0026] A sand box conveyor roller is installed on the frame and located above the mold bottom frame conveyor roller, for conveying sand boxes to the sand adding device;

[0027] The excess sand frame conveyor roller is installed on the frame and located above the sand box conveyor roller, and is used to convey the excess sand box to the sand adding device.

[0028] As a further technical solution, the mold bottom frame conveying roller conveyor, the sand box conveying roller conveyor, and the excess sand frame conveying roller conveyor are all side roller conveyors. The side rollers on both sides of the excess sand frame conveying roller conveyor are slidably connected to the frame and can be kept away from each other to avoid the downward-moving excess sand box. The conveying device also includes:

[0029] A supporting conveyor roller is disposed on the frame and extends below the multi-contact mechanism. The supporting conveyor roller is located between the mold bottom frame conveyor roller and the sand box conveyor roller. The supporting conveyor roller is used to convey the mold bottom frame, sand box and excess sand box after sand addition to the compaction device. The supporting conveyor roller is a side roller conveyor, and the side rollers on both sides can be kept away from each other to avoid the upward-moving mold bottom frame.

[0030] The beneficial effects of this invention are as follows:

[0031] In this invention, a connector is provided at the connection end between the support frame and the tie rod, with the end face of the connector abutting the upper end of the support frame, and a pre-tightening mechanism is provided to pull the tie rod upward. When installing the tie rod or before compaction by the multi-contact mechanism, the pre-tightening mechanism pulls the tie rod, causing it to exceed the proportional limit and yield limit and enter the strengthening stage, thereby increasing the force required for the tie rod to deform. This allows the tie rod to generate pre-tightening force and enter the strengthening stage before bearing the force from the mold, thus preventing deformation of the tie rod during compaction and enhancing the stability of the connection between the tie rod and the support frame. This ensures that when the multi-contact mechanism compacts molding sand, the tie rod can stably overcome the upward reaction force on the support frame, avoiding insufficient compaction force due to tie rod deformation, and ensuring the reliability of the molding machine's compaction operation. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of the present invention and these drawings without any creative effort.

[0033] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0034] Figure 2 This is a schematic diagram of the pulling pre-tensioning mechanism and the top structure of the frame in this invention;

[0035] Figure 3 This is a schematic diagram of the main structure of the support frame in this invention;

[0036] Figure 4 for Figure 1 Schematic diagram of the cross-sectional structure in the middle BB direction;

[0037] Figure 5 for Figure 4 Enlarged structural diagram at point C;

[0038] Figure 6 This is a schematic diagram of the left-side structure of the present invention;

[0039] Figure 7 for Figure 6 Enlarged structural diagram at point A in the middle;

[0040] Figure 8 This is a schematic cross-sectional view of the connecting frame structure of the present invention;

[0041] Figure 9 The connecting frame of this invention is perpendicular to Figure 8 A schematic diagram of the cross-sectional structure in the middle section;

[0042] In the diagram: 100, sand adding device; 110, metering hopper; 120, lifting device; 130, frame;

[0043] 200. Compaction device; 210. Frame; 211. Connecting frame; 2111. Connecting part; 2112. Supporting part; 2113. Reinforcing rib; 220. Multi-contact mechanism; 230. Sand box supporting mechanism; 231. Lifting support plate; 232. Guide rod; 233. Top block; 240. Support frame; 250. Tie rod; 260. Connecting piece; 270. Pulling pre-tightening mechanism; 271. Support frame; 2711. Adjustment opening; 272. Tensioning piece; 273. Top screw;

[0044] 300. Conveying device; 310. Mold bottom frame conveying roller conveyor; 320. Sand box conveying roller conveyor; 330. Excess sand frame conveying roller conveyor; 340. Supporting conveying roller conveyor. Detailed Implementation

[0045] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it.

[0046] To keep the drawings concise, each drawing only schematically shows the parts relevant to the invention; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0047] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0048] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0049] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0050] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0051] like Figures 1-3 As shown, this invention illustrates a dual-station molding machine according to an embodiment of the present invention, including a sand feeding device 100, a compaction device 200, and a conveying device 300 for moving the molding sand box between the two devices. The compaction device 200 includes a frame 210, a tie rod 250, a connector 260, and a pre-tensioning mechanism 270. The frame 210 serves as the basic support structure of the compaction device 200. The frame 210 mainly consists of multiple columns and a support frame 240. The bottom of the columns is fixed to the ground with anchor bolts, and the top is provided with the support frame 240, which serves as the top of the frame 210. The support frame 240 is mainly divided into two parts. One part serves as the mounting base for the multi-contact mechanism 220, supporting the multi-contact mechanism 220. The other part consists of multiple plate-like structures, each mounted on a different column, with a minimum of four. The two parts of the support frame 240 are welded together by notch welding to improve the strength of the connection. The multi-contact mechanism 220 is mounted on the support frame 240. During the compaction process, the support frame 240 bears the upward reaction force transmitted by the multi-contact mechanism 220 when it compacts the molding sand downward.

[0052] It should be explained that the molding sand box is a box structure with a molding sand cavity. It can be formed by welding multiple plate-shaped or frame-shaped structures, or by splicing together a sand slag frame, a sand box, and a mold bottom frame. Here, the molding sand box formed by splicing together a sand slag frame, a sand box, and a mold bottom frame is applicable.

[0053] The connection between the support frame 240 and the frame 210 is in the form of tie rods. The support frame 240 is supported by the top of the frame 210 and then fixed in position using tie rods 250. Several tie rods 250 are used, and these rods share the reaction force on the support frame 240. One end of each tie rod 250 is connected to the support frame 240, and the other end is connected to the bottom of the frame 210. When the multi-contact mechanism 220 compacts the molding sand in the molding sand box, the tie rods 250 can overcome the upward reaction force on the support frame 240, maintaining structural stability. In addition to the common fixed connection, the tie rods 250 can optionally be adjusted to better adapt to the stress requirements under different working conditions. For example, by setting adjusting nuts at both ends of the tie rods 250, the length of the tie rods 250 can be finely adjusted.

[0054] The connector 260 is a cylindrical, square, or hexagonal nut with threads on its inner wall. It is threaded onto the end of the pull rod 250 that connects to the support bracket 240, with its end face abutting against the upper end of the support bracket 240, further securing the connection between the pull rod 250 and the support bracket 240 and enhancing its stability. The connector 260 is typically hexagonal to facilitate tightening with tools such as wrenches. Alternatively, a specially designed nut, such as one with anti-slip grooves, can be used to provide greater friction after tightening, preventing loosening.

[0055] The tensioning mechanism 270 is mounted on the support frame 240, connected to the tie rod 250 and located above the connector 260, and can pull the tie rod 250 upward. By applying a preload to the tie rod 250, the tie rod 250 passes through the yielding stage and enters the strengthening stage, thereby enhancing the stability of the tie rod 250 when subjected to reaction forces.

[0056] By providing a connector 260 at the connection end between the support frame 240 and the tie rod 250, with the end face of the connector 260 abutting against the upper end of the support frame 240, and by providing a pre-tensioning mechanism 270 to pull the tie rod 250 upward, the two work together to enhance the stability of the connection between the tie rod 250 and the support frame 240, effectively preventing deformation at the connection of the tie rod 250. This ensures that when the multi-contact mechanism 220 compacts the molding sand, the tie rod 250 can stably overcome the upward reaction force on the support frame 240, avoiding the problem of insufficient compaction force due to deformation of the tie rod 250, and ensuring the reliability of the molding machine's compaction operation.

[0057] Furthermore, the pre-tensioning mechanism 270 includes a support frame 271 and a tensioning member 272. The support frame 271 is mounted on the support bracket 240, the connector 260 is located inside the support frame 271, and the pull rod 250 passes through the top of the support frame 271. The support frame 271 provides installation space and support structure for the connector 260 and the tensioning member 272, ensuring smooth pre-tensioning operation. The support frame 271 can be a frame type, or optionally, a box-type structure with reinforcing ribs 2113 to enhance its strength and stability. The tensioning member 272 is threaded onto the pull rod 250 and located above the support frame 271, and is connected with several axially penetrating set screws 273. By rotating the set screws 273 to push the top of the support frame 271, the tensioning member 272 can pull the pull rod 250 upwards, achieving pre-tensioning of the pull rod 250. The number of set screws 273 can be adjusted according to actual needs, generally 3-6, evenly distributed on the tensioning member 272. Optionally, set screws 273 can also be replaced with hydraulic push rods, which use a hydraulic system to precisely control the pushing force and achieve more accurate pre-tensioning.

[0058] In the pre-tightening connection mechanism, the support frame 271 provides support for the connector 260 and the tensioning member 272. The tensioning member 272 pushes the top of the support frame 271 upwards via the set screw 273, pulling the tie rod 250 upwards. This structural design makes the pre-tightening operation of the tie rod 250 more convenient and precise. By reasonably adjusting the set screw 273, the pre-tightening degree of the tie rod 250 can be better controlled, further enhancing the stability of the tie rod 250. This ensures that the tie rod 250 can withstand greater reaction force when working on a high-tonnage molding machine, effectively solving the problem of insufficient compaction force and improving the compaction effect.

[0059] Furthermore, the side wall of the support frame 271 has an adjustment opening 2711 for tools to pass through. The support frame 271 can be composed of a four-column support structure and a top structure, or it can be composed of a four-wall support structure and a top structure. When the support frame 271 is composed of a four-column support structure and a top structure, an adjustment opening 2711 is formed between the two support columns. If the support frame 271 is composed of a four-wall support structure and a top structure, then at least one of the support walls has an adjustment opening 2711. Through the adjustment opening, the connector 260 located inside the support frame 271 can be turned using a wrench or other tools, so that after the tie rod 250 is extended under force, the connector 260 can be rotated to re-adhere to the top of the frame 210.

[0060] Furthermore, to facilitate the re-fitting of the end face of the connector 260 against the top surface of the support frame 240 after the tensioner 272 pulls the pull rod 250 to pre-tighten and extend via the set screw 273, the side wall of the support frame 271 has an opening through which a tool for tightening the connector 260 passes. This opening allows operators to easily tighten or loosen the connector 260 using tools, ensuring convenient installation and maintenance of the connector 260. The opening is typically rectangular in shape, with dimensions designed according to the size of commonly used tools; alternatively, it can be circular or other shapes that facilitate tool passage.

[0061] Furthermore, the molding sand box support mechanism 230 can rise and approach the multi-contact mechanism 220. Specifically, the molding sand box support mechanism 230 includes a lifting support plate 231 and a top block 233. The lifting support plate 231 is flexibly mounted on the frame 210 and can support the molding sand box. Guide rods 232 at its bottom penetrate the frame 210, providing guidance for the lifting of the lifting support plate 231. The number of guide rods 232 is generally 4-8, evenly distributed at the bottom of the lifting support plate 231. The lifting support plate 231 can be raised and lowered by a hydraulic cylinder. One end of the hydraulic cylinder is mounted on the frame 210, and the other end is connected to the support plate, allowing the hydraulic cylinder to extend and retract, thus driving the lifting support plate 231 to rise and fall.

[0062] The top block 233 is horizontally slidably mounted on the frame 210. Its front-end push-in slope pushes against the bottom of the guide rod 232. The end of the push-in slope closer to the guide rod 232 is lower than the end farther from it. The bottom of the guide rod 232 has a slope adapted to the push-in slope. This increases the connection area between the guide rod 232 and the top block 233, thereby improving the load-bearing capacity of the top block 233, and also reduces wear on the push-in slope. After the lifting support plate 231 drives the guide rod 232 to a set height, and before the multi-contact mechanism 220 presses down the molding sand, the top block 233 can provide upward pressure to the guide rod 232 through the guide slope, thus ensuring the stability of the lifting support plate 231 during the process of bearing the downward pressure from the multi-contact mechanism. The sliding of the top block 233 can be achieved by setting a guide rail on the frame 210. Optionally, a slider and a groove can be used to ensure the smooth sliding of the top block 233. The top block 233 uses a hydraulic cylinder to achieve horizontal sliding.

[0063] By using the top block 233, the lifting support plate 231 can be stably maintained at a certain height, which improves the accuracy and stability of the compaction operation, thereby improving the working efficiency and compaction quality of the molding machine.

[0064] refer to Figures 7-9 The frame 210 has a load-bearing plate at its bottom, and a connecting frame 211 is connected to the load-bearing plate. The connecting frame 211 includes a connecting part 2111 and a supporting part 2112. The top block 233 is slidably mounted on the supporting part 2112. The connecting part 2111 is T-shaped, penetrates the frame 210, and can be hung on the frame 210 to provide support for the top block 233. Specifically, the horizontal part of the T-shaped connecting part 2111 is located above the load-bearing plate of the frame 210, while the vertical part penetrates the load-bearing plate of the frame 210 and is welded or bolted to the connecting part 2111. The connecting frame 211 can transmit the force of the top block 233 to the frame 210. The horizontal bar portion of the connecting part 2111 effectively provides upward support when the top block 233 supports the guide rod, while the vertical bar portion prevents the top block 233 from providing horizontal force when supporting the guide rod, thus preventing the connecting frame 211 from falling off the frame 210. Optionally, the connection between the connecting part 2111 and the frame 210 can also be reinforced with bolts to further enhance the stability of the connection. The connecting part 2111 can be T-shaped in cross-section; for example, the portion of the connecting part 2111 above the load-bearing plate of the frame 210 can be disc-shaped, while the portion penetrating the load-bearing plate of the frame 210 can be square or circular.

[0065] The T-shaped connecting part 2111 of the connecting frame 211 passes through the frame body 210 and hangs on the frame body 210, providing support and guidance for the top block 233, so that the top block 233 can smoothly slide the push guide rod 232. The T-shaped structure enhances the stability of the connection between the connecting frame 211 and the frame body 210, ensuring that the connecting frame 211 will not shift or fall off due to force when the top block 233 is working, ensuring the reliability of the molding sand box support mechanism 230 and improving the overall stability of the molding machine structure.

[0066] Furthermore, the frame 210 has two vertically aligned load-bearing plates. A connecting frame 211 connects to the lower load-bearing plate. Several reinforcing ribs 2113, which connect to the upper load-bearing plate, are attached to one end of the connecting frame 211 on the lower load-bearing plate. This provides upward tension to the connecting part 2111. The double-layered load-bearing plates distribute the downward force exerted on the connecting frame 211 by the top block 233 supporting the guide rod, thereby enhancing the stability of the connection between the connecting frame 211 and the frame 210. The upper load-bearing plate can be located at the top, middle, or other positions of the frame 210, depending on the specific circumstances.

[0067] refer to Figures 4-6 In some embodiments, the conveying device 300 includes a mold bottom frame conveying roller conveyor 310, a sand box conveying roller conveyor 320, and a surplus sand frame conveying roller conveyor 330. The mold bottom frame conveying roller conveyor 310 is used to convey the mold bottom frame to the sand adding device 100. The sand box conveying roller conveyor 320 is located on one side of the frame 210 and above the mold bottom frame conveying roller conveyor 310, and is used to convey the sand box to the sand adding device 100. The surplus sand frame conveying roller conveyor 330 is located on one side of the frame 210 and above the sand box conveying roller conveyor 320, and is used to convey the surplus sand box to the sand adding device 100.

[0068] The mold base frame, sand box, and excess sand frame are conveyed by roller conveyor 310, sand box conveyor 320, and excess sand frame conveyor 330, respectively. Then, at the sand adding device 100, the mold base frame, sand box, and excess sand frame are assembled from bottom to top to form a molding sand box, which contains a molding sand cavity for holding molding sand. The mold base frame forms the supporting bottom, the sand box is a frame with four sides extending vertically and vertically, and contains a sand core, and the excess sand frame is also a frame with four sides extending vertically and vertically. The mold base frame, sand box, and excess sand frame together form a molding sand box with a top opening and four sides. After molding sand is added to the top, the entire box can be moved to the compaction station for compaction.

[0069] Furthermore, the bottom frame conveyor roller 310, the sand box conveyor roller 320, and the excess sand frame conveyor roller 330 are all side roller conveyors. The side rollers on both sides of the excess sand frame conveyor roller 330 can slide away from each other so that the excess sand box can move downwards, so that the excess sand frame conveyor roller 330 can avoid it and the excess sand frame can descend.

[0070] Furthermore, the conveying device 300 also includes a supporting conveyor roller 340, which is disposed on one side of the frame 210 and extends onto the frame 210. The supporting conveyor roller 340 is located between the mold bottom frame conveyor roller 310 and the sand box conveyor roller 320, and is used to support and convey the mold bottom frame, sand box, and excess sand box after sand addition. The supporting conveyor roller 340 is a side roller conveyor, and the side rollers on both sides can move away from each other, allowing the mold bottom frame to rise and support the sand box and excess sand box. The movement of the side rollers moving closer or further apart can be driven by a device such as an electric push rod or a cylinder. Optionally, a screw and nut mechanism can also be used for control to adjust the distance between the side rollers.

[0071] Furthermore, the mold bottom frame conveyor roller 310 and the excess sand frame conveyor roller 330 are equipped with a rotation drive mechanism. The rotation drive mechanism drives the side rollers to rotate via chain transmission, thereby moving the mold bottom frame and the excess sand frame. To ensure the accuracy of the conveying position, a stroke trigger switch and a positioning mechanism can be installed on the paths of the excess sand frame conveyor roller 330 and the mold bottom frame conveyor roller 310 to prevent instability in the conveying position of the excess sand frame and the mold bottom frame. The stroke trigger switch and the positioning mechanism can both adopt existing technologies, so they will not be described in detail here. The sand box conveyor roller 320 is pushed by a rear-end pusher mechanism. Several sand boxes abut against each other on the sand box conveyor roller 320, and the rear-end pusher mechanism moves the sand boxes by pushing them. The support conveyor roller 340 is a passive conveyor. After sand is added, the mold bottom frame falls on the support conveyor roller 340. At this time, there is a certain gap between the sand box and the sand box conveyor roller 320 to prevent the bottom of the sand box from separating from the mold bottom frame due to processing or assembly errors of the two rollers, thus avoiding sand leakage. The sand box pushing mechanism pushes the sand box so that the next sand box can enter the sand adding station. After the sand adding is completed, the sand box, the excess sand frame and the mold bottom frame move towards the compaction station.

[0072] Furthermore, the sand adding device 100 includes a frame 130 and a metering hopper 110. The frame 130 is located on one side of the frame body 210, and the conveying device 300 is mounted on the frame 130. The metering hopper 110 is mounted on the frame 130 and located above the residual sand box conveying roller conveyor 320, and is used to hold a metered amount of molding sand. Several flaps are rotatably mounted at the bottom of the hopper. By rotating the flaps, the bottom of the hopper can be opened, allowing the molding sand to fall into the molding sand box below. The rotation of the flaps can be driven by a motor or cylinder. Optionally, a combination of an electric push rod and a linkage mechanism can be used to achieve precise control of the flaps.

[0073] Optionally, the quantitative hopper 110 adds the amount of molding sand contained in a molding sand box each time, and the opening of the flap can ensure that the molding sand enters the molding sand box evenly.

[0074] Furthermore, the sand adding device 100 also includes a lifting device 120, which is mounted on the frame 130 and located below the mold bottom frame conveyor roller 310. The lifting device 120 can lift the mold bottom frame located on the mold bottom frame conveyor roller 310, raising it and sequentially supporting the sand box and excess sand frame to form a molding sand box. Then, it lifts the molding sand box closer to the metering hopper 110, allowing the molding sand to fall more accurately into the molding sand box. The lifting device 120 can employ hydraulic lifting or screw lifting, or optionally, pneumatic lifting. The appropriate lifting method should be selected according to actual needs to ensure the stability and accuracy of the lifting.

[0075] Working Principle: When the dual-station molding machine is working, the conveying device 300 first transports the mold base frame to below the sand adding device 100 via the mold base frame conveying roller 310. Simultaneously, the sand box is transported to its corresponding position via the sand box conveying roller 320, and the excess sand box is transported to its position via the excess sand box conveying roller 320. The lifting device 120 lifts the mold base frame upwards. During the ascent, the mold base frame sequentially supports the sand box and the excess sand box to form a top-opening molding sand box before continuing to rise towards the metering hopper 110. The flap at the bottom of the metering hopper 110 rotates to open the sand outlet, allowing molding sand to fall into the molding sand box. During the ascent of the mold base frame, the side rollers of the supporting conveying roller 340 first move away from each other to avoid the mold base frame. Then, the sand box on the mold base frame lifts the excess sand box, or after sand adding is completed, the side rollers of the excess sand box conveying roller 330 move away from each other to avoid the excess sand box, allowing the excess sand box to descend. Simultaneously, the side rollers of the supporting conveyor roller 340 move closer to a position capable of supporting the mold base frame. After sand addition is completed, the supporting conveyor roller 340 receives the molding sand box formed by the combination of the mold base frame, sand box, and excess sand box. Subsequently, the supporting conveyor roller 340 transports it to the compaction device 200.

[0076] The conveyor roller 340 transports the sand box, consisting of the sand-filled mold base frame, sand box, and excess sand frame, to the top of the support mechanism. The lifting support plate 231 of the support mechanism rises and lifts the sand box until it is delivered below the multi-contact mechanism 220. Then, the top block 233 of the sand box support mechanism 230 slides horizontally, and its pushing inclined surface pushes the guide rod 232 at the bottom of the lifting support plate 231, so that the lifting support plate 231 can be stably maintained at a fixed height. The multi-contact mechanism 220, supported by the support frame 240, compacts the sand in the sand box. At this time, the tie rod 250 overcomes the upward reaction force on the support frame 240. After compaction, the sand box can be transported to the next process via the conveyor 300.

[0077] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A dual-station molding machine, characterized in that, It includes a sand feeding device (100), a compaction device (200), and a conveying device (300) for conveying a sand box between the two, wherein the compaction device (200) includes: The frame (210) is provided with a multi-contact mechanism (220) and a molding sand box support mechanism (230) located below the multi-contact mechanism (220). A plurality of pull rods (250) are provided, the upper ends of which are connected to the top of the frame (210) and the lower ends of which are connected to the bottom of the frame (210). When the multi-contact mechanism (220) presses down the molding sand in the molding sand box, the pull rods (250) can pull down the top of the frame (210). A connector (260) is threaded to the upper end of the pull rod (250), and the lower end face of the connector (260) can abut against the top of the frame (210); A pre-tensioning mechanism (270) is raised and lowered on the frame (210) and connected to the upper end of the pull rod (250). The pre-tensioning mechanism (270) is used to pull one end of the pull rod (250) upward. The pull pretensioning mechanism (270) includes: A support frame (271) is mounted on the frame body (210), the connector (260) is located inside the support frame (271), and the tie rod (250) passes through the top of the support frame (271); A tensioning member (272) is threaded onto the pull rod (250) and located above the support frame (271). The tensioning member (272) is threaded with a plurality of axially penetrating set screws (273), which are used to abut against the top of the support frame (271) so that the tensioning member (272) pulls the pull rod (250) upward. The side wall of the support frame (271) has an adjustment opening (2711) through which a tool passes to turn the connector (260).

2. The dual-station molding machine according to claim 1, characterized in that, The molding sand box support mechanism (230) includes: A lifting support plate (231) is lifted and installed on the frame (210). The lifting support plate (231) is used to support the molding sand box. The bottom of the lifting support plate (231) has a guide rod (232). The guide rod (232) passes through the frame (210) and slides with the frame (210). The top block (233) is horizontally slidably mounted on the frame (210). The top block (233) has a pushing slope, which is used to support the bottom of the guide rod (232).

3. A dual-station molding machine according to claim 2, characterized in that, The bottom of the frame (210) is provided with a connecting frame (211), the connecting frame (211) includes a connecting part (2111) suspended at the bottom of the frame (210) and a supporting part (2112) provided at the bottom of the connecting part (2111) and extending horizontally, and the top block (233) is slidably disposed on the supporting part (2112).

4. A dual-station molding machine according to claim 3, characterized in that, The top of the connecting part (2111) is also connected to a number of reinforcing ribs (2113) that are connected to the top of the frame (210).

5. A dual-station molding machine according to claim 1, characterized in that, The sand adding device (100) includes: A frame (130) is disposed on one side of the frame (210), and the conveying device (300) is disposed on the frame (130); A metering hopper (110) is set on top of the frame (130) and above the conveying device (300) for holding a metered amount of molding sand. The bottom of the metering hopper (110) has a sand outlet, and the sand outlet is rotatably equipped with several flaps, which can rotate to open the sand outlet.

6. A dual-station molding machine according to claim 5, characterized in that, The sand adding device (100) also includes: A lifting device (120) is provided at the bottom of the frame (130). The lifting device (120) is located below the conveying device (300). The lifting device (120) is capable of lifting the molding sand box located on the conveying device (300) and bringing it closer to the metering hopper (110).

7. A dual-station molding machine according to claim 5, characterized in that, The conveying device (300) includes: A mold bottom frame conveyor roller (310) is disposed on the frame (130) for conveying the mold bottom frame to the sand feeding device (100); A sand box conveying roller (320) is disposed on the frame (130) and located above the mold bottom frame conveying roller (310) for conveying sand boxes to the sand adding device (100); The excess sand frame conveying roller (330) is disposed on the frame (130) and located above the sand box conveying roller (320) for conveying excess sand boxes to the sand adding device (100).

8. A dual-station molding machine according to claim 7, characterized in that, The mold bottom frame conveying roller conveyor (310), the sand box conveying roller conveyor (320), and the surplus sand frame conveying roller conveyor (330) are all side roller conveyors. The side rollers on both sides of the surplus sand frame conveying roller conveyor (330) are slidably connected to the frame (130) and can be kept away from each other to avoid the downward-moving surplus sand box. The conveying device (300) also includes: The supporting conveyor roller (340) is disposed on the frame (130) and extends below the multi-contact mechanism (220). The supporting conveyor roller (340) is located between the mold bottom frame conveyor roller (310) and the sand box conveyor roller (320). The supporting conveyor roller (340) is used to convey the mold bottom frame, sand box and excess sand box after sand addition to the compaction device (200). The supporting conveyor roller (340) is a side roller conveyor, and the side rollers on both sides can move away from each other to avoid the upward moving mold bottom frame.

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