A double-station turnover molding machine

Abstract

The application discloses a double-station overturning molding machine, which comprises a double-station switching assembly installed on a rack, a turnover assembly arranged on one side of the double-station switching assembly, and a sand shooting mechanism matched with the turnover assembly and arranged on the upper side of the rack. A rotating motor is drivingly connected with a rotating frame, and two groups of upper brackets and two groups of lower brackets are further arranged on the rotating frame. Upper sliding sleeves with upper clamping arms are further arranged on the two sides of an upper sand box, and lower sliding sleeves with lower clamping arms are further arranged on the two sides of a lower sand box. The upper sliding sleeves and the lower sliding sleeves are movably connected with movable sliding rods respectively, the upper clamping arms are correspondingly clamped and fixed with the end portions of the upper brackets, and the lower clamping arms are correspondingly clamped and fixed with the end portions of the lower brackets. The molding machine is provided with the double-station switching assembly and the turnover assembly, and the sand shooting molding and the demolding process can be simultaneously performed. Through the cooperative work of the double-station switching assembly and the turnover assembly, the sand shooting station and the ejection station can be synchronously switched, the demolding and discharging can be simultaneously completed during the sand shooting molding, the production efficiency is effectively improved, the downtime waiting time is reduced, and the continuous production requirement of the large-batch casting scene is met.

Description

Technical Field

[0001] This invention relates to the field of molding machines, and more specifically to a dual-station flip molding machine. Background Technology

[0002] In the foundry industry, the molding machine, as the core equipment for sand mold preparation, directly impacts production efficiency and overall equipment performance through its station design. Currently, most mainstream molding machines adopt a single-station structure, where sand filling, compaction, and mold removal are completed sequentially on the same work platform. While this structure offers advantages such as simple operation logic and lower manufacturing costs, its production efficiency per unit time is low. Single-station molding machines must complete all process steps within a single physical space, and each step must be executed strictly in sequence. Existing single-station devices require stopping the machine to disassemble the sand box and refill the molding sand after completing the mold molding, making continuous production impossible. This serial operation mode results in significant wasted waiting time. According to industry measurement data, the effective processing time of a single-station molding machine accounts for only 40%-55% of the entire cycle, severely limiting unit time output. For high-volume casting scenarios such as automotive parts and construction machinery, this deficiency directly causes production line imbalance.

[0003] A dual-station automatic molding machine, disclosed in Chinese Patent Application Publication No. CN113059126A, is a dual-station molding machine with upper and lower sand injection. This machine separates sand injection molding and demolding / pushing processes, allowing them to be performed simultaneously on the left and right sides of the frame. This achieves both molding and core placement without delay, maximizing time efficiency. However, vertical extrusion is unsuitable for vertical parting, as it may cause the casting to stick to the mold during demolding, and it can also create voids around the extrusion feet. Therefore, there is an urgent need for a dual-station, flip-type molding machine that balances high efficiency and stability. Summary of the Invention

[0004] To address the aforementioned problems, this invention aims to provide a high-efficiency and stable dual-station flip molding machine.

[0005] To achieve this technical objective, the present invention provides a dual-station tilting molding machine, comprising a pump station and a frame, and a dual-station switching component mounted on the frame. A tilting component is provided on one side of the dual-station switching component, and a sand-shooting mechanism that can match the tilting component is also provided above one side of the frame.

[0006] The dual-station switching assembly consists of a rotating motor, a rotating frame, a first housing mechanism, and a second housing mechanism. The rotating motor is driven and connected to the rotating frame. The rotating frame is also equipped with two sets of upper brackets and two sets of lower brackets. The first housing mechanism and the second housing mechanism are both composed of a movable slide rod, an upper sand box, and a lower sand box. The upper sand box is equipped with upper sliding sleeves with upper biting arms on both sides, and the lower sand box is equipped with lower sliding sleeves with lower biting arms on both sides. The upper sliding sleeves and lower sliding sleeves can be movably connected to the movable slide rod. The upper biting arms can be correspondingly engaged and fixed to the ends of the upper brackets, and the lower biting arms can be correspondingly engaged and fixed to the ends of the lower brackets. The rotating motor can drive the first housing mechanism and the second housing mechanism to rotate horizontally to complete the switching between the sand-shooting station and the molding station.

[0007] Preferably, the flipping assembly is composed of a flipping drive cylinder, a flipping frame, a mold feeding mechanism, an upper pressing mechanism, and a lower pressing mechanism. At least two flipping drive cylinders are horizontally installed on the upper part of the frame. The flipping frame is hinged to the frame via a rotating shaft. The flipping drive cylinder can drive the flipping frame to switch from a vertical state to a horizontal sand-shooting state. The mold feeding mechanism is located in the middle of the flipping frame, and the upper pressing mechanism and the lower pressing mechanism are slidably installed on the flipping frame.

[0008] Preferably, the pressing mechanism consists of an upper base, an upper pressing cylinder, an upper pressing plate, and a first sliding sleeve. The tilting frame is symmetrically provided with lifting slide rods. The upper base is slidably connected to the lifting slide rods on the upper part of the tilting frame through the first sliding sleeve. The upper pressing cylinder is installed on the upper base and is drivenly connected to the upper pressing plate. The upper base is also provided with two or more upper box positioning modules.

[0009] The pressing mechanism consists of a lower base, a lower pressing cylinder, a lower pressing plate, and a second sliding sleeve. The lower base is slidably connected to the lifting slide rod at the bottom of the tilting frame through the second sliding sleeve. The lower pressing cylinder is installed on the lower base and is drivenly connected to the lower pressing plate. The lower base is also provided with two or more lower box positioning modules.

[0010] Preferably, the frame is also equipped with a discharge mechanism and an upward pushing mechanism. The upward pushing mechanism is located above one side of the dual-station switching component, and the discharge mechanism is located below one side of the dual-station switching component. The discharge mechanism is composed of a receiving platform, a push plate, a discharge cylinder, a receiving plate, and a lifting cylinder. The discharge cylinder is driven to the push plate, and the lifting cylinder is driven to the receiving plate. The receiving plate is located directly below the lower sand box of the extrusion station, and the receiving platform is located to one side of the receiving plate. After the first box mechanism or the second box mechanism completes sand injection and mold closing and rotates to the extrusion station, the lifting cylinder drives the receiving plate to rise to the lower part of the lower sand box and contact the bottom of the molding sand. The upward pushing mechanism pushes the molding sand downward through the upper sand box. When the molding sand separates from the lower sand box and reaches the same height as the receiving platform, the push plate pushes the molding sand into the receiving platform to complete the discharge action.

[0011] Preferably, the upper sand box has two or more positioning posts on its upper perimeter, and the upper sand box positioning module can match the positioning posts; the lower sand box has two or more positioning slots on its lower perimeter, and the lower sand box positioning module can match the positioning slots.

[0012] Preferably, the upper sand box has two or more locking grooves on its lower perimeter and the lower sand box has two or more locking posts on its upper perimeter, so that when the mold is closed, the locking grooves on the lower perimeter of the upper sand box can match the locking posts on the upper perimeter of the lower sand box.

[0013] Preferably, the mold feeding mechanism includes a horizontal slide rail, a slide frame, and a mold frame. The slide frame is slidably mounted on the horizontal slide rail, and the mold frame is fixedly mounted below the slide frame. The mold frame has a hollow frame structure, and a limiting post that can match the snap-fit ​​groove is provided above the mold frame.

[0014] Preferably, the lifting slide of the tilting frame is also equipped with limit switches on one side to monitor the positions of the upper and lower bases.

[0015] Preferably, the upper box positioning module is composed of an upper positioning cylinder, a positioning rod, and a support sleeve. The positioning rod is slidably installed in the support sleeve. The upper positioning cylinder is driven to connect with the positioning rod. The bottom of the positioning rod is provided with a locking groove. The upper positioning cylinder can drive the positioning rod to move up and down to achieve locking and fixing or loosening of the locking groove with the positioning post on the upper sand box.

[0016] The beneficial effects of this invention are as follows: the molding machine of this application achieves parallel operation of sand injection molding and demolding processes through the combination of a dual-station switching component and a flipping component; through the coordinated work of the dual-station switching component and the flipping component, the sand injection station and the demolding station are switched synchronously, and demolding and material discharge are completed at the same time as sand injection molding, which effectively improves production efficiency, reduces downtime waiting time, and meets the continuous production needs of mass casting scenarios; this application optimizes process actions and adopts a flipping component that can perform both horizontal and vertical extrusion, resulting in good compaction stability and better compaction quality. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the dual-station switching component structure of the present invention;

[0019] Figure 3 This is a top view of the dual-station switching component of the present invention.

[0020] Figure 4 This is a schematic diagram of the structure of the flipping component and the workstation switching component of the present invention;

[0021] Figure 5 This is a schematic diagram of the material discharge mechanism and the lower sand box of the present invention. Detailed Implementation

[0022] The following is in conjunction with the appendix Figure 1-5 The present invention will be further described in detail with reference to specific embodiments. The technical solutions in this application are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The components of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. It should be noted that similar reference numerals and letters in the following drawings indicate similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. 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.

[0023] In traditional single-station molding machine systems, sand injection, mold closing, and demolding processes must be executed sequentially within a single physical space. The mandatory time dependencies between these processes result in idle time exceeding half of the effective processing cycle. While dual-station sand injection systems shorten process changeover time through spatial separation, the longitudinal pressure gradient generated by the extrusion mechanism under vertical parting conditions easily creates stress concentration zones within the sand mold. This causes adhesion between the mold and the die contact surface during demolding, and uneven sand density occurs in the upper and lower interlocking areas.

[0024] For example, in a car engine block casting production line, when using a dual-station sand-shooting machine for continuous molding, the extrusion feet at the vertical parting line of the mold create localized high-pressure zones during compaction, causing the difference in compaction between the top and bottom of the sand mold to exceed the allowable threshold. When the flipping mechanism performs the demolding action, during the separation of the lower and upper sand boxes, the molding sand and the mold contact surface undergo asymmetrical peeling due to residual longitudinal stress, resulting in fracture defects at the mold edges. This results in a scrap rate of at least 3% per production batch.

[0025] If the above problems are not addressed, the imbalance in stress distribution within the sand mold will cause the dimensional accuracy of the castings to deviate from the design requirements, increasing the cutting allowance for subsequent machining processes. The adhesion effect between the mold and the molding sand will accelerate wear on the parting surface, shorten the mold's lifespan, and trigger unplanned equipment downtime for maintenance. Instability in the process cycle will disrupt the balance between different stations on the casting production line, causing molten metal to wait or overflow in the melting furnace and pouring machine, directly affecting the overall energy efficiency ratio of the production system.

[0026] Faced with the aforementioned problems, this application first analyzes the root cause of the stress imbalance in the sand mold caused by the longitudinal pressure gradient under vertical parting conditions, and finds that the force direction of the extrusion mechanism in the layout of the upper and lower sand shooting stations is perpendicular to the mold parting surface, which is the core cause. To address this, this application attempts to change the direction of force application during station switching and mold closing, exploring the possibility of changing the sand shooting and demolding processes from vertical parting to horizontal rotation. Specifically, if the sand shooting process is arranged in a horizontal station, the sand box posture can be changed by using lateral rotation, avoiding the longitudinal stress residue caused by vertical pressure. However, simply rotating the sand box introduces the defect of insufficient positioning accuracy. Therefore, this application further considers simultaneously setting up a multi-directional positioning and clamping mechanism during the rotation process, ensuring the positional stability of the sand box after rotation through a combination of lifting slides and positioning modules. At the same time, to eliminate the invalid waiting time caused by process switching, this application conceives of a double-box horizontal rotation structure, enabling the sand shooting and demolding processes to operate synchronously in two spatially separated stations. The rotating motor drives two sets of boxes to alternately enter the sand injection and demolding stations, and the rotating drive cylinder controls the mold posture to form a working rhythm of horizontal mold closing during sand injection and vertical separation during demolding, ultimately realizing the continuous sand mold preparation and stress equalization decoupling.

[0027] In this regard, this application proposes: a dual-station flip molding machine, including a pump station and a frame 1, and also including a dual-station switching component 2 installed on the frame 1, a flip component 3 is provided on one side of the dual-station switching component 2, and a sand shooting mechanism 4 that can match the flip component 3 is also provided on the upper side of one side of the frame 1.

[0028] The dual-station switching assembly 2 consists of a rotary motor 5, a rotating frame 6, a first housing mechanism 10, and a second housing mechanism 11. The rotary motor 5 is driven and connected to the rotating frame 6. The rotating frame 6 is also equipped with two sets of upper brackets 601 and two sets of lower brackets 602. The first housing mechanism 10 and the second housing mechanism 11 are both composed of a movable slide rod 7, an upper sand box 8, and a lower sand box 9. The upper sand box 8 is also equipped with upper sliding sleeves 802 with upper biting arms 801 on both sides. The lower sand box 9 is also equipped with lower sliding sleeves 902 with lower biting arms 901 on both sides. The upper sliding sleeves 802 and the lower sliding sleeves 902 can be movably connected to the movable slide rod 7. The upper biting arms 901 can be correspondingly engaged and fixed to the end of the upper bracket 601. The lower biting arms 901 can be correspondingly engaged and fixed to the end of the lower bracket 602. The rotary motor 5 can drive the first housing mechanism 10 and the second housing mechanism 11 to rotate horizontally to complete the switching between the sand shooting station and the molding station.

[0029] The flipping assembly 3 is composed of a flipping drive cylinder 301, a flipping frame 302, a mold feeding mechanism 303, an upper pressing mechanism 304, and a lower pressing mechanism 305. At least two flipping drive cylinders 301 are horizontally installed on the upper part of the frame 1. The flipping frame 302 is hinged to the frame 1 via a rotating shaft. The flipping drive cylinders 301 can drive the flipping frame 302 to switch from a vertical state to a horizontal sand-shooting state. The mold feeding mechanism 303 is located in the middle of the flipping frame 302. The upper pressing mechanism 304 and the lower pressing mechanism 305 are slidably installed on the flipping frame 302.

[0030] The upper pressing mechanism 304 consists of an upper base 306, an upper pressing cylinder 307, an upper pressing plate 308, and a first sliding sleeve 309. The tilting frame 302 is symmetrically provided with lifting slide rods 310. The upper base 306 is slidably connected to the lifting slide rods 310 on the upper part of the tilting frame 302 through the first sliding sleeve 309. The upper pressing cylinder 307 is installed on the upper base 306 and is drivenly connected to the upper pressing plate 308. The upper base 306 is also provided with two or more upper box positioning modules 311.

[0031] The pressing mechanism 305 consists of a lower base 312, a lower pressing cylinder 313, a lower pressing plate 314, and a second sliding sleeve 315. The lower base 312 is slidably connected to the lifting slide rod at the bottom of the tilting frame 302 through the second sliding sleeve 315. The lower pressing cylinder 313 is installed on the lower base 312 and is drivenly connected to the lower pressing plate 314. The lower base 312 is also provided with two or more lower box positioning modules 316.

[0032] The dual-station switching component refers to a device that enables alternating operation of two stations through a mechanical structure. Specifically, it can be achieved by using a rotating motor to drive a rotating frame with a box mechanism. The rotating frame carries two sets of box mechanisms and switches between the sand-shooting station and the molding station through horizontal rotation, enabling continuous production. The flipping component is a device used to adjust the spatial posture of the sand box. Specifically, it can be achieved by using a flipping drive cylinder to drive a flipping frame hinged to the machine frame to switch between vertical and horizontal sand-shooting states. This works in conjunction with the mold feeding mechanism and the clamping mechanism to complete the sand box positioning and mold closing operations, reducing downtime. The upper and lower pressure mechanisms are devices that apply pressure to the upper and lower parts of the sand box, respectively. Specifically, it can be achieved by using a clamping cylinder to drive a pressure plate that moves along a lifting slide bar with a sliding sleeve. Through precise docking with the positioning structure of the sand box via a positioning module, it ensures the accuracy of the cavity position during mold closing and avoids extrusion voids. The interlocking structure between the upper and lower sand boxes refers to a mechanism that positions the box body through the cooperation of a sliding sleeve and a movable sliding rod. Specifically, it can adopt a mechanical interlocking method where the upper sliding sleeve has an upper biting arm that engages with the upper bracket, and the lower sliding sleeve has a lower biting arm that engages with the lower bracket. This ensures the stability of the box body when rotating and switching positions, preventing sand mold misalignment. This application can separate the sand injection and molding processes into two independent stations for synchronous operation through the synergistic action of the dual-station switching component and the flipping component. It can also perform horizontal extrusion followed by vertical extrusion, and utilize the upper and lower clamping mechanisms and positioning modules to achieve rapid and accurate mold closing of the sand box. This overcomes the efficiency bottleneck caused by the sequential process of traditional single-station equipment, achieving the dual effects of continuous production and stable quality.

[0033] The working process and principle of this application are as follows: the dual-station switching component is driven by a rotating motor to rotate the rotating frame, which in turn drives the first box mechanism and the second box mechanism to switch between the sand shooting station and the molding station. Each box mechanism includes a movable slide rod, an upper sand box and a lower sand box, which are connected to the movable slide rod through upper and lower sliding sleeves and can be locked and fixed with the bracket on the rotating frame.

[0034] During operation, a rotary motor drives a box-shaped mechanism to rotate to the sand-shooting station, while a tilting cylinder tilts the frame to a horizontal position. After the mold is loaded, the upper and lower pressing mechanisms position and clamp the sand box, and the sand-shooting mechanism completes the sand-shooting process. Then, the tilting frame returns to a vertical position, and the rotary motor drives the box-shaped mechanism to rotate to the demolding station, while another box-shaped mechanism enters the sand-shooting station to begin a new cycle. This design enables parallel operation of the sand-shooting and demolding processes, improving production efficiency. The lifting slide and positioning module design of the upper and lower pressing mechanisms ensures the positional accuracy of the sand box during the tilting process. The combination of horizontal sand-shooting and vertical demolding avoids the stress concentration problem caused by traditional vertical extrusion. The dual-station switching structure eliminates waiting time between processes, enabling continuous production.

[0035] As a preferred embodiment, the solution of this application is implemented as follows: A discharge mechanism 12 and an upward pushing mechanism 13 are provided on the frame 1. The upward pushing mechanism 13 is located above one side of the dual-station switching component 2, and the discharge mechanism 12 is located below one side of the dual-station switching component 2. The discharge mechanism 12 is composed of a receiving platform 1201, a push plate 1202, a discharge cylinder 1203, a receiving plate 1204, and a lifting cylinder 1205. The discharge cylinder 1203 is drivenly connected to the push plate 1202, and the lifting cylinder 1205 is drivenly connected to the receiving plate 1204. The receiving plate 1204 is located directly below the lower sand box 9 of the molding station, and the receiving platform 1201 is located on one side of the receiving plate 1204.

[0036] After the first or second housing mechanism completes sand injection and mold closing and moves to the ejection station, the lifting cylinder drives the receiving plate to rise to the bottom of the lower sand box and contact the bottom of the molding sand. The upward pushing mechanism pushes the molding sand downward through the upper sand box. When the molding sand separates from the lower sand box and reaches the same height as the receiving platform, the push plate pushes the molding sand into the receiving platform to complete the ejection action. Specifically, the receiving plate moves vertically driven by the lifting cylinder, with a lifting stroke covering the height from the bottom of the lower sand box to the receiving platform; the push plate moves horizontally driven by the ejection cylinder, with a horizontal stroke covering the distance from the receiving plate to the receiving platform. The upward pushing mechanism is located above the dual-station switching assembly, and its actuator can pass through the internal space of the upper sand box.

[0037] Through the above technical solution, this application achieves an automated material discharge process, improving production efficiency. The coordinated use of the discharge mechanism and the mold-pushing mechanism allows the molding sand to be smoothly removed from the sand box and transferred to the receiving platform. This design avoids damage to the molding sand that may be caused by manual operation, ensuring the stability of casting quality. At the same time, the automated discharge process reduces manual intervention, lowers the labor intensity of operators, and improves the safety of the working environment. In addition, the setting of the discharge mechanism enables the molding machine to work continuously, reducing downtime and further improving equipment utilization and production efficiency.

[0038] In some of the solutions described above in this application, the dual-station switching component drives the box mechanism to rotate horizontally to complete the station switching, and the flipping component drives the flipping frame to switch states for sand injection and mold closing. During this process, the mold closing accuracy of the upper and lower sand boxes directly affects the molding quality of the sand. Inaccurate positioning may lead to difficulties in demolding or damage to the sand mold.

[0039] This application further proposes that two or more positioning posts 803 are provided on the upper perimeter of the upper sand box 8, and the upper box positioning module 311 is matched with the positioning posts 803; two or more positioning grooves 903 are provided on the lower perimeter of the lower sand box 9, and the lower box positioning module 316 is matched with the positioning grooves 903; two or more snap-fit ​​grooves 804 are provided on the lower perimeter of the upper sand box 8, and two or more snap-fit ​​posts 904 are provided on the upper perimeter of the lower sand box 9, so that when the mold is closed, the snap-fit ​​grooves 804 of the upper sand box 8 are matched with the snap-fit ​​posts 904 of the lower sand box 9.

[0040] The vertical alignment of the positioning pins and positioning slots limits the lateral displacement of the upper and lower sand boxes, while the horizontal alignment of the locking slots and locking pins restricts their longitudinal offset. There are four or more positioning pins and slots distributed around the sand boxes to further ensure uniform force distribution during mold closing. The top of the locking pins is conical, and the inner wall of the locking slots is sloped, allowing for self-alignment during mold closing. A locking slot is located at the bottom of the positioning rod of the upper box positioning module. The inner wall of the locking slot complements the outer wall of the positioning pin, and the locking slot secures the positioning pin as the positioning rod descends.

[0041] Specifically, during mold closing, the upper pressing mechanism drives the upper sand box downwards, while the lower pressing mechanism drives the lower sand box upwards. The positioning rod of the upper box positioning module is driven downwards by the upper positioning cylinder, and the locking groove contacts and engages with the positioning post of the upper sand box, forcing the upper sand box to remain horizontal. Simultaneously, the positioning rod of the lower box positioning module engages with the positioning groove of the lower sand box, eliminating longitudinal gaps. When the upper and lower sand boxes approach the mold closing position, the conical surface of the engaging post contacts the inclined surface of the engaging groove, guiding them to precise alignment. After mold closing, the engaging post is fully embedded in the engaging groove, forming a mechanical interlock. During this process, the vertical constraint of the positioning post and the positioning groove, and the horizontal constraint of the engaging post and the engaging groove work together to control the mold closing error within ±0.5mm, preventing uneven pressure on the molding sand and the resulting voids, while also reducing demolding resistance and preventing the casting from sticking to the mold.

[0042] This application further proposes a mold feeding mechanism 303 including a horizontal slide rail, a slide frame, and a mold frame. The slide frame is slidably installed on the horizontal slide rail, and the mold frame is fixedly installed below the slide frame. The mold frame has a hollow frame structure, and a limiting post that can match the snap-fit ​​groove is provided above the mold frame.

[0043] The horizontal slide rail is machined to ensure flatness, and rollers or linear bearings are used to connect the carriage and the horizontal slide rail to reduce frictional resistance. The mold frame is made of welded steel plates to form a hollow frame, and its internal space is used to support the mold. The diameter of the limiting post and the hole diameter of the locking groove are controlled within the tolerance range of ±0.1mm to ensure no gap during insertion. When the carriage moves along the horizontal slide rail, the mold frame moves synchronously. After the limiting post enters the locking groove with the mold frame, it is axially fixed through an interference fit.

[0044] Specifically, during mold loading, the slide moves along the horizontal slide rail to the set position. The hollow frame structure of the mold holder encloses the mold and restricts its lateral displacement. The limiting pins on the mold holder insert into the locking grooves of the upper sand box, achieving radial positioning through the contact between the pin surface and the groove wall. When the tilting drive cylinder drives the tilting frame to switch to the horizontal sand shooting state, the cooperation between the limiting pins and the locking grooves can offset the displacement of the mold caused by gravity, ensuring that the central axis of the mold coincides with the central axis of the sand box. During mold closing, the positioning rod of the upper pressing mechanism moves downward to press the upper sand box. At this time, the rigid contact between the limiting pins and the locking grooves further eliminates the assembly gap between the mold and the sand box, preventing mold displacement caused by the vibration of the molding sand during sand shooting. Through the guiding action of the horizontal slide rail and the insertion and positioning of the limiting pins, the repeatability of the mold loading mechanism can be controlled within 0.05mm, effectively improving the consistency of mold closing. This structural design simplifies the mold changing process, improves production efficiency, and ensures the accuracy and stability of mold installation.

[0045] This application further proposes that the upper box positioning module 311 is composed of an upper positioning cylinder, a positioning rod and a support sleeve. The positioning rod is slidably installed in the support sleeve. The upper positioning cylinder is driven to connect with the positioning rod. A locking groove is provided at the bottom of the positioning rod. The upper positioning cylinder can drive the positioning rod to move up and down to realize that the locking groove can be engaged and fixed or released from the positioning post 803 on the upper sand box 8.

[0046] The support sleeve adopts a cylindrical guide structure to ensure the vertical movement trajectory of the positioning rod; the locking groove is set as a U-shaped groove structure, and its opening direction is perpendicular to the axis of the positioning column; the upper positioning cylinder adopts a double-acting air cylinder or oil cylinder, and a mechanical limit device is set at the end of the stroke; a linear bearing is installed between the support sleeve and the positioning rod to reduce frictional resistance.

[0047] Specifically, when the piston rod of the upper positioning cylinder extends, it pushes the positioning rod downward. The U-shaped locking groove at the bottom of the positioning rod vertically engages with the top flange of the upper sand box positioning post, achieving circumferential positioning through three-point contact. When the positioning rod fully descends to the mechanical limit position, the inner wall of the locking groove forms an interference fit with the positioning post, eliminating radial clearance. After sand shooting is completed, the upper positioning cylinder reverses its movement, causing the positioning rod to rise and disengage from the positioning post. At this time, the upper sliding sleeve moves along the movable sliding rod to separate the sand box. This structure, combining rigid contact positioning with hydraulic drive, ensures that the repeatability accuracy of each mold closing position is controlled within ±0.05mm, avoiding the elastic deformation error caused by traditional spring positioning.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any minor modifications, equivalent substitutions, and improvements made to the above embodiments based on the technical essence of the present invention should be included within the protection scope of the present invention.

Claims

1. A dual-station tilting molding machine, comprising a pump station and a frame, characterized in that: It also includes a dual-station switching assembly installed on the frame, wherein a flipping assembly is provided on one side of the dual-station switching assembly, and a sand-shooting mechanism that can match the flipping assembly is also provided on the upper side of the frame. The dual-station switching assembly consists of a rotating motor, a rotating frame, a first housing mechanism, and a second housing mechanism. The rotating motor is driven and connected to the rotating frame. The rotating frame is also equipped with two sets of upper brackets and two sets of lower brackets. The first housing mechanism and the second housing mechanism are both composed of a movable slide rod, an upper sand box, and a lower sand box. The upper sand box is equipped with upper sliding sleeves with upper biting arms on both sides, and the lower sand box is equipped with lower sliding sleeves with lower biting arms on both sides. The upper sliding sleeves and lower sliding sleeves can be movably connected to the movable slide rod. The upper biting arms can be correspondingly engaged and fixed to the ends of the upper brackets, and the lower biting arms can be correspondingly engaged and fixed to the ends of the lower brackets. The rotating motor can drive the first housing mechanism and the second housing mechanism to rotate horizontally to complete the switching between the sand-shooting station and the molding station.

2. The dual-station flip-type molding machine according to claim 1, characterized in that: The flipping assembly is composed of a flipping drive cylinder, a flipping frame, a mold feeding mechanism, an upper pressing mechanism, and a lower pressing mechanism. At least two flipping drive cylinders are horizontally installed on the upper part of the frame. The flipping frame is hinged to the frame via a rotating shaft. The flipping drive cylinder can drive the flipping frame to switch from a vertical state to a horizontal sand-shooting state. The mold feeding mechanism is located in the middle of the flipping frame. The upper pressing mechanism and the lower pressing mechanism are slidably installed on the flipping frame.

3. The dual-station flip-type molding machine according to claim 2, characterized in that: The upper pressing mechanism consists of an upper base, an upper pressing cylinder, an upper pressing plate, and a first sliding sleeve. The tilting frame is symmetrically provided with lifting slide rods. The upper base is slidably connected to the lifting slide rods on the upper part of the tilting frame through the first sliding sleeve. The upper pressing cylinder is installed on the upper base and is drivenly connected to the upper pressing plate. The upper base is also provided with two or more upper box positioning modules. The pressing mechanism consists of a lower base, a lower pressing cylinder, a lower pressing plate, and a second sliding sleeve. The lower base is slidably connected to the lifting slide rod at the bottom of the tilting frame through the second sliding sleeve. The lower pressing cylinder is installed on the lower base and is drivenly connected to the lower pressing plate. The lower base is also provided with two or more lower box positioning modules.

4. The dual-station flip-type molding machine according to claim 1, characterized in that... The frame is also equipped with a discharge mechanism and an upward pushing mechanism. The upward pushing mechanism is located above one side of the dual-station switching component, and the discharge mechanism is located below one side of the dual-station switching component. The discharge mechanism is composed of a receiving platform, a push plate, a discharge cylinder, a receiving plate, and a lifting cylinder. The discharge cylinder is driven to the push plate, and the lifting cylinder is driven to the receiving plate. The receiving plate is located directly below the lower sand box of the molding station, and the receiving platform is located to one side of the receiving plate. After the first box mechanism or the second box mechanism completes sand injection and mold closing and rotates to the molding station, the lifting cylinder drives the receiving plate to rise to the lower part of the lower sand box and contact the bottom of the molding sand. The upward pushing mechanism pushes the molding sand downward through the upper sand box. When the molding sand separates from the lower sand box and reaches the same height as the receiving platform, the push plate pushes the molding sand into the receiving platform to complete the discharge action.

5. The dual-station flip-type molding machine according to claim 3, characterized in that: The upper sand box is provided with two or more positioning posts on its upper perimeter, and the upper sand box positioning module can match the positioning posts; the lower sand box is provided with two or more positioning slots on its lower perimeter, and the lower sand box positioning module can match the positioning slots.

6. The dual-station flip-type molding machine according to claim 5, characterized in that: The upper sand box has two or more locking grooves on its lower perimeter, and the lower sand box has two or more locking posts on its upper perimeter. When the mold is closed, the locking grooves on the lower perimeter of the upper sand box can match the locking posts on the upper perimeter of the lower sand box.

7. The dual-station flip-type molding machine according to claim 6, characterized in that: The mold feeding mechanism includes a horizontal slide rail, a slide frame, and a mold frame. The slide frame is slidably installed on the horizontal slide rail, and the mold frame is fixedly installed below the slide frame. The mold frame has a hollow frame structure, and a limiting post that can match the snap-fit ​​groove is provided above the mold frame.

8. The dual-station flip-type molding machine according to claim 3, characterized in that: The lifting slide of the tilting frame is also equipped with limit switches on one side to monitor the position of the upper and lower machine bases.

9. The dual-station flip-type molding machine according to claim 5, characterized in that: The upper box positioning module is composed of an upper positioning cylinder, a positioning rod, and a support sleeve. The positioning rod is slidably installed in the support sleeve. The upper positioning cylinder is driven to connect with the positioning rod. A locking groove is provided at the bottom of the positioning rod. The upper positioning cylinder can drive the positioning rod to move up and down to achieve locking and fixing or loosening of the locking groove with the positioning post on the upper sand box.

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