The mold-lifting and box-moving line-changing device and its working method in the iron mold sand casting production line.

Abstract

This invention relates to a mold-removing and mold-shifting device and its working method in an iron mold sand casting production line, belonging to the field of machinery. This invention realizes the iron mold / model and the mold-moving / molding separation operations through a mold conveying unit mechanism; it realizes the conveying operation of the iron mold through a mold conveying unit mechanism; and it realizes the mold-removing / molding separation of the iron mold and model, and the mold-shifting and mold-shifting operations through a mold-removing / molding-shifting unit mechanism. This invention can complete the mold-removing separation between multiple types of iron molds and their corresponding models, and the mold-shifting and mold-shifting transport of the iron molds in the production line after mold-removing separation. This allows the iron molds and models to be transported parallel to each other, meeting the logistics transport needs of a multi-variety large casting iron mold sand casting production line. It achieves mechanized, automated, and intelligent production of multi-variety small-batch large casting iron mold sand casting, with low manufacturing costs.

Description

Technical Field

[0001] This invention relates to an apparatus and method, particularly to a mold-lifting and box-moving device and its working method for iron mold casting production lines using iron mold sand casting. It is a multi-variety large iron mold mold-lifting and box-moving device for iron mold sand casting production lines that simultaneously produce multiple varieties of small batches of large castings, and a method for mold-lifting, box-moving and line-moving iron molds when using iron mold sand casting to simultaneously produce multiple varieties of small batches of large castings. It belongs to the field of machinery. Background Technology

[0002] Iron mold sand casting technology is a casting process with advantages such as being green, high-quality, and energy-saving. After years of application and promotion, it has been widely recognized and is mainly used in the production of large batches of small and medium-sized castings.

[0003] In existing iron mold sand casting production lines, the production process generally involves assembling two iron molds (upper and lower) to form the mold required for the casting. The sand molding device in these lines uses a method where the mold is fixed to the device, and the upper and lower iron molds move in and out of the device to perform the sand molding process. In recent years, with the development of my country's equipment manufacturing industry, the quality and technical level of many large-scale equipment have reached or even surpassed international advanced levels, such as wind power products, high-speed rail products, and new energy industries.

[0004] These large-scale equipment places higher demands on the quality of the castings used. These castings (such as planetary carrier castings, housing castings, cage castings in wind power castings, and large motor housing castings in high-speed rail locomotives) are produced in small batches and are often serialized and large-scale (the weight of the castings ranges from several tons to tens of tons, and the maximum size is 1.5-6 meters). Moreover, the structure of the castings is complex, and the molds used for casting production often require multiple iron molds to be assembled into a single mold.

[0005] Traditional sand-coating molding methods for iron mold casting are clearly insufficient for iron mold sand-coating casting production lines that can simultaneously produce small batches of large castings of various types. In order to achieve sand-coating molding of multiple different large iron molds, two equipment devices are used to complete the sand-shooting and sand-coating molding of iron molds and the separation and demolding of iron molds and models, respectively.

[0006] The separation and demolding of iron molds and models, combined with the material flow and conveying of iron molds in large-scale iron mold sand casting production lines, has been newly developed. This device is suitable for the separation and transfer of different iron molds and models in multi-variety, small-batch large-scale iron mold sand casting production lines, enabling the two to be separated and transported in the production line. This is one of the important conditions for realizing the mechanization, automation, and intelligent production line of this type of multi-variety, small-batch large-scale iron mold sand casting. Summary of the Invention

[0007] The purpose of this invention is to overcome the above-mentioned deficiencies in the prior art and to provide a reasonable structural design, safe and reliable device for separating iron molds and corresponding models of multiple varieties, and for conveying the iron molds in the production line after separation. This enables mechanized, automated and intelligent production of large-scale iron mold casting with sand coating, which is low in manufacturing cost and easy to assemble, disassemble and maintain. The device and its working method are described in the invention.

[0008] The technical solution adopted by this invention to solve the above problems is: the mold lifting and box-moving line-changing device in the iron mold sand casting production line includes an iron mold / model lifting and separation station, an iron mold casting line-changing conveying starting station, an iron mold casting lifting / box-moving line-changing unit mechanism, an iron mold casting conveying operation unit mechanism, and a model conveying operation unit mechanism. The model conveying operation unit mechanism realizes the iron mold / model and the entry and exit of the iron mold / model lifting and separation station. The iron mold casting conveying operation unit mechanism realizes the conveying operation of the iron mold casting. The iron mold casting lifting / box-moving line-changing unit mechanism realizes the iron mold casting and mold... The method for separating and moving the iron mold casting mold is characterized by the following: the iron mold casting mold separation / moving / line changing unit mechanism includes a mold separation / line changing trolley track frame, a column, a mold separation / line changing trolley, an iron mold casting gripping hook beam, a mold separation lifting beam, multiple mold separation lifting hydraulic cylinders, multiple mold separation guide rods, multiple guide sleeves, and multiple iron mold casting gripping hooks. The mold separation / line changing trolley track frame is connected to the column, and the mold separation / line changing trolley moves back and forth on the track on the mold separation / line changing trolley track frame. Multiple mold separation lifting hydraulic cylinders are installed on the upper planes of both sides of the mold separation / line changing trolley body. Above, the piston rod head of the hydraulic cylinder for lifting the mold is connected to the moving beam of the iron mold grasping hook through a connector; multiple iron mold grasping hooks are installed on the lower plane of the moving beam of the iron mold grasping hook; multiple mold lifting guide rods and multiple guide sleeves slide with each other, the lower flange of the mold lifting guide rod is fixed on the upper plane of the moving beam of the iron mold grasping hook, and the upper part of the mold lifting guide rod is fixed to the upper beam of the mold lifting; the iron mold conveying and running unit mechanism includes a motorized side roller, a support beam, an iron mold grasping hook receiving groove, multiple support columns, and multiple side roller track supports, the multiple side roller track supports are fixed to the multiple support columns, and the support beam is connected to the support columns; Motorized side rollers are installed sequentially at a certain distance in the roller support of two side rollers. The side roller support has a slot for receiving the iron pattern gripping hook at the falling position. The model conveying unit mechanism includes a support beam, motorized rollers, multiple roller supports, multiple columns, and multiple pairs of model plate clamping devices. The multiple roller supports are connected to the multiple columns, and the support beam is fixedly connected to the two roller supports. The motorized rollers are installed sequentially on the two roller supports at a certain distance. Two to three pairs of model plate clamping devices are fixedly installed in the gap between the motorized rollers of the roller supports on both sides of the iron pattern / model separation station.

[0009] Preferably, the present invention comprises four iron mold casting gripping hooks, which are arranged symmetrically in pairs and fixed on the lower plane of the iron mold casting gripping hook moving beam.

[0010] Preferably, the present invention comprises four mold-lifting guide rods, which are symmetrically arranged, forming an integral frame structure between the mold-lifting upper beam, the mold-lifting guide rods, and the iron mold casting gripping hook beam.

[0011] Preferably, the mold-lifting hydraulic cylinder of the present invention adopts a dual hydraulic cylinder lifting method with a hydraulic synchronizer; this saves on the manufacturing cost and operating cost of the device, and ensures smooth mold lifting of the iron mold.

[0012] Preferably, the model plate clamping device of the present invention adopts a movable wedge; by moving the wedge and tightly fitting it with the wedge surface at the corresponding position of the model plate, the model plate is firmly fixed on the model conveyor roller.

[0013] Preferably, when the model is in motion, the bottom plane of the model plate is in contact with the circumferential surface of the motorized roller. As the motorized roller rotates, the model plate moves linearly on the model conveying and running unit mechanism.

[0014] Preferably, the iron-shaped gripping hook receiving groove of the present invention is set at the position where the iron-shaped gripping hook falls on the side roller conveyor support. The upper plane of the iron-shaped gripping hook receiving groove should be a certain distance lower than the lowest plane of the iron-shaped gripping hook; in order to ensure that the lower plane of the iron-shaped running edge is in complete contact with the motorized side roller of the iron-shaped conveyor running motorized side roller conveyor.

[0015] This invention also provides a mold-lifting and box-moving line-changing device and its working method for a multi-variety large casting mold sand-coated casting production line, used in a multi-variety large casting mold sand-coated casting production line that simultaneously produces multiple different varieties of small batches of large castings. The specific steps are as follows: The mold-lifting / box-moving line-changing unit mechanism is located above the mold / model mold-lifting separation station, and the mold-grabbing hook in the mold-lifting / box-moving line-changing unit mechanism is at its highest point; the mold-lifting lifting hydraulic cylinder system in the mold-lifting / box-moving line-changing unit mechanism activates a low-pressure, high-capacity lowering operation mode, the piston of the mold-lifting hydraulic cylinder descends, driving the mold-grabbing hook to descend; when the piston of the mold-lifting hydraulic cylinder descends to the middle position, the piston of the mold-lifting hydraulic cylinder stops descending. The mold is lowered, at which point the upper plane of the mold-grabbing hook is 10-20 mm lower than the lower plane of the mold edge after mold closing. The motorized roller conveyor in the mold conveying unit is activated, transporting the mold / model (after sand injection and sand coating) to the mold / model separation station and stopping. The mold locking device then secures the model tightly to the conveying roller conveyor. The mold lifting hydraulic cylinder in the mold lifting / moving unit is then activated, entering a high-pressure, low-speed mode. In this mode, the hydraulic cylinder generates a stable lifting force of several hundred tons, causing the piston of the lifting hydraulic cylinder to rise and drive the mold... The mold-grabbing hook rises, and once its upper surface fully contacts the lower surface of the mold's running edge, it continues to rise. The mold is locked and fixed to the mold / model conveyor rollers by the mold locking mechanism, preventing the mold from rising with the mold. The mold continues to rise, and as the piston of the mold-lifting hydraulic cylinder in the mold-lifting / moving unit rises, the mold separation process begins. The mold-lifting hook rises another 30-50 mm, completely separating the mold from the model. The high-pressure, low-speed operation mode of the mold-lifting hydraulic cylinder system in the mold-lifting / moving unit switches to a low-pressure, high-capacity operation mode, driving the mold-lifting hook to continue rising, allowing the mold to continue its ascent. The mold rises until the lower plane of the iron mold is 30-40 mm higher than the highest surface of the model, at which point it stops. At this point, the iron mold is completely separated from the model, thus completing the mold separation operation between the iron mold and the model. The mold / model moving trolley in the mold / model separation unit mechanism starts and moves the molded iron mold from the mold / model separation station to the iron mold conveying unit mechanism and stops. The mold lifting hydraulic cylinder in the mold / model separation unit mechanism starts the low-pressure, high-capacity operation and descent mode, driving the mold grab hook to descend. The iron mold is lowered accordingly. When the lower plane of the running edge of the iron mold contacts the upper plane of the motorized side roller on the motorized side roller conveyor of the iron mold conveying unit mechanism, the iron mold stops descending.The piston of the mold-lifting hydraulic cylinder continues to descend a certain distance, completely separating the upper plane of the mold-grabbing hook from the lower plane of the mold's running edge. At this point, the distance between the upper plane of the mold-grabbing hook and the lower plane of the mold's running edge is 10-20 mm, and the piston of the mold-lifting hydraulic cylinder has reached its lowest point. Simultaneously, the mold locking device on the mold conveyor roller in the mold / model separation station moves outward and loosens, releasing the locking between the roller and the mold. The motorized roller in the mold conveyor unit starts, and the mold can gradually move out of the mold / model separation station and into the next operating station of the multi-variety large casting mold sand casting production line. At the same time, the motorized side roller in the mold casting conveyor unit starts, gradually moving the mold casting that has completed the mold-lifting operation and box-shifting process out of the mold. The mold conveying and relocation unit station, via the side roller conveyor in the mold conveying and relocation unit mechanism, transports the iron mold to the next work unit in the multi-variety large casting mold sand-coated casting production line. After the iron mold is removed from the mold conveying and relocation unit station, the mold lifting hydraulic cylinder activates the low-pressure, high-capacity lifting mode, raising the piston to its highest position, causing the mold gripping hook to reach its highest position. The mold lifting / relocation moving trolley in the mold lifting / relocation unit mechanism then starts, moving the mold lifting / relocation unit from the mold conveying and relocation unit position to the mold / model lifting and separation station position, where it stops. This completes one mold / model lifting and separation operation, as well as the relocation and conveying operation of the model and the iron mold.

[0016] Compared with the prior art, the present invention has the following advantages and effects: (1) The overall device structure is reasonably designed, safe and reliable, with low manufacturing cost and low equipment installation and maintenance cost; (2) It can complete the mold separation operation between multiple different iron molds and models for large castings of multiple varieties; (3) The device of this application can complete the line-changing conveying operation of iron molds, meet the requirements of different casting models, iron molds after mold separation, and iron mold line-changing conveying in the iron mold sand casting production process of large castings of multiple varieties, and is conducive to meeting the logistics conveying and layout requirements of the iron mold sand casting production line of large castings of multiple varieties; (4) The device of this application The iron mold sand casting production line for producing multiple varieties of large castings at the same time can realize the mechanized, automated and intelligent iron mold sand casting production of large castings; (5) This application adopts the iron mold casting / model through conveying mode after sand shooting molding, the model is locked and fixed on the roller conveyor, and the iron mold casting is separated by mold release; the iron mold casting and model mold release separation and iron mold casting box transfer and line change conveying are integrated into a structure; (6) This application can be used for iron mold sand casting production of multiple varieties of small batches of high-quality large castings, further broadening the application scope and field of iron mold sand casting, which is conducive to improving the quality and level of large equipment manufacturing industry. Attached Figure Description

[0017] Figure 1 Schematic diagram of a large wind turbine main shaft casting Figure 1 .

[0018] Figure 2 Schematic diagram of a large wind turbine main shaft casting Figure 2 .

[0019] Figure 3 This is a schematic diagram of a composite mold for large wind turbine main shafts, consisting of an iron mold coated with sand and a self-hardening resin sand mold. Figure 1 .

[0020] Figure 4 This is a schematic diagram of a composite mold for large wind turbine main shafts, consisting of an iron mold coated with sand and a self-hardening resin sand mold. Figure 1 .

[0021] Figure 5 This is a diagram showing the process before the iron mold and model are separated in a traditional iron mold sand casting production line.

[0022] Figure 6 This is a diagram showing the process after the iron mold and model are separated in a traditional iron mold sand casting production line.

[0023] Figure 7 This is a sand-coated iron mold model for large castings, the iron mold structure, and a schematic diagram of the mold assembly. Figure 1 .

[0024] Figure 8 This is a sand-coated iron mold model for large castings, the iron mold structure, and a schematic diagram of the mold assembly. Figure 2 .

[0025] Figure 9 It is a flowchart of the process of separating the iron mold and the model, as well as the process of diverting and transporting the iron mold and the model.

[0026] Figure 10 This is a front view schematic diagram of the iron mold casting mold and model separation and line-changing box-moving device according to an embodiment of the present invention.

[0027] Figure 11 This is a top view schematic diagram of the iron mold casting mold and model separation and line-changing box-moving device according to an embodiment of the present invention.

[0028] Figure 12 This is a side view schematic diagram of the iron mold casting and model separation and line-changing box-moving device according to an embodiment of the present invention.

[0029] Figure 13 yes Figure 11 A schematic diagram of the AA direction.

[0030] Figure 14 yes Figure 11 A schematic diagram of the BB direction.

[0031] Figure 15 This is a front view schematic diagram of the iron mold casting mold lifting / box shifting unit mechanism according to an embodiment of the present invention.

[0032] Figure 16 This is a top view schematic diagram of the iron mold casting / box shifting unit mechanism according to an embodiment of the present invention.

[0033] Figure 17 This is a side view schematic diagram of the iron mold casting / box shifting unit mechanism according to an embodiment of the present invention.

[0034] Figure 18 This is a front view schematic diagram of the model transport and operation unit mechanism according to an embodiment of the present invention.

[0035] Figure 19 This is a top view schematic diagram of the model conveying and running unit mechanism according to an embodiment of the present invention.

[0036] Figure 20 This is a side view schematic diagram of the model transport and operation unit mechanism according to an embodiment of the present invention.

[0037] Figure 21 This is a front view schematic diagram of the iron mold casting conveying and operating unit mechanism according to an embodiment of the present invention.

[0038] Figure 22 This is a top view schematic diagram of the iron mold casting conveying and operating unit mechanism according to an embodiment of the present invention.

[0039] Figure 23 This is a side view schematic diagram of the iron mold casting conveying and operating unit mechanism according to an embodiment of the present invention.

[0040] Figure 24 This is a schematic diagram of the iron mold casting mold lifting and box moving and line changing device according to an embodiment of the present invention, showing the mold lifting / line changing trolley at the mold lifting separation station and the piston of the mold lifting hydraulic cylinder at its highest position during the mold lifting and line changing operation.

[0041] Figure 25 This is a schematic diagram of the iron mold casting mold lifting and box moving and line changing device according to an embodiment of the present invention, showing the mold lifting / line changing trolley at the mold lifting separation station and the piston of the mold lifting hydraulic cylinder descending to the middle position.

[0042] Figure 26 This is a schematic diagram of the iron mold / model entering the mold-raising station and the rear mold plate locking device locking the mold plate during the iron mold raising and shifting operation of the iron mold casting mold raising and shifting device in an embodiment of the present invention.

[0043] Figure 27 This is a schematic diagram illustrating the process of the iron mold casting and mold changing device according to an embodiment of the present invention, in which the mold-lifting hydraulic cylinder rises to the highest position to complete the mold separation operation between the iron mold casting and the model.

[0044] Figure 28 This is a schematic diagram illustrating the process of the iron mold casting and mold-moving / line-changing device according to an embodiment of the present invention, during which the iron mold casting is at its highest position and the casting / line-changing trolley moves to the starting position of the iron mold conveying.

[0045] Figure 29 This is a schematic diagram illustrating the state of the mold plate locking device being released and locked on the mold plate during the mold release and mold transfer line changing operation of the mold casting mold lifting and line changing device in an embodiment of the present invention.

[0046] Figure 30 This is a schematic diagram illustrating the iron mold leaving the iron mold conveying starting position and the model conveying leaving the iron mold / model leaving the iron mold / model demolding position during the iron mold casting mold lifting and box moving and line changing operation of the iron mold casting mold lifting and line changing device in the embodiment of the present invention.

[0047] Figure 31 This is a schematic diagram showing the process of the iron mold casting mold lifting and box moving and line changing device in an embodiment of the present invention. The mold lifting / line changing trolley is at the starting position of the iron mold conveying and the piston of the mold lifting hydraulic cylinder is raised to the highest position.

[0048] Figure 32 This is a schematic diagram showing the process of the iron mold casting mold lifting and box moving and line changing device according to an embodiment of the present invention. The mold lifting / line changing trolley moves to the mold lifting separation station and the piston of the mold lifting hydraulic cylinder is at its highest position.

[0049] in: Figures 3-4 : Straight sprue 1-1, main shaft self-hardening sand upper box mold 1-2, main shaft inner cavity self-hardening sand mold 1-3, main shaft outer iron mold covered with sand mold 1-4, main shaft flange self-hardening sand bottom box mold 1-5, horizontal sprue 1-6, iron mold edge running 1-7.

[0050] Figures 5-6 : Iron mold sand covering molding machine 2-1, iron mold running edge 2-2, mold plate and base 2-3, model and workbench fixing bolts 2-4, mold lifting workbench 2-5, iron mold conveying roller 2-6, mold lifting hydraulic cylinder 2-7, conveying roller 2-8, iron mold 1 2-9, model 1 2-10.

[0051] Figures 7-8 : Casting model 3-1, Iron mold 3-2, Iron mold edge running 3-3, Iron mold gripping and conveying plane 3-4, Model locking wedge surface 3-5, Model plate 3-6, Model conveying plane 3-7, Iron mold casting edge running 3-8.

[0052] Figures 9-32In the middle: 1. Iron mold / model separation station; 2. Iron mold casting line change conveying starting station; 3. Iron mold casting mold separation / box moving line change unit mechanism; 4. Iron mold casting conveying operation unit mechanism; 5. Model conveying operation unit mechanism. Iron mold casting mold lifting / moving box relocation unit mechanism 3: mold lifting / relocation moving trolley track frame 31, column 32, mold lifting / relocation moving trolley 33, mold lifting lifting hydraulic cylinder 34, iron mold casting gripping hook moving beam 35, mold lifting lifting upper beam 36, mold lifting guide rod 37, guide sleeve 38, iron mold casting gripping hook 39; Iron mold casting conveyor operation unit mechanism 4: side roller roller support 41, motorized side roller 42, support column 43, support beam 44; Model conveying and operating unit mechanism 5: roller support 51, column 52, support beam 53, motorized roller wheel 54, model plate clamping device 55. Detailed Implementation

[0053] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments. Example

[0054] When using iron mold sand casting technology to produce large castings, the castings are often large in size, heavy in weight, and complex in structure, such as wind turbine main shaft castings (see...). Figures 1-2 The castings are 4-6 meters long and weigh 20-30 tons. When producing these large castings using sand casting with iron molds, the sand-coated mold often requires multiple iron molds stacked together, such as the sand-coated mold for wind turbine main shafts (see...). Figures 3-4 The composite mold mainly includes the sprue 1-1, the self-hardening sand upper box mold of the main shaft 1-2, the self-hardening sand mold of the inner cavity of the main shaft 1-3, the iron mold covered with sand on the outer side of the main shaft 1-4, the self-hardening sand bottom box mold of the main shaft flange 1-5, the horizontal sprue 1-6, and the iron mold running edge 1-7. At the same time, the volume, weight, and structure of these iron molds are completely different from those of large-batch, small and medium-sized castings. The weight of a set (multiple iron molds) of a single type of casting often reaches tens of tons or even hundreds of tons, and its production cost is very high. The production batch of this type of casting is small, with only a few pieces produced each day. Thus, when each type of casting is produced using iron mold covered with sand casting, only one set of iron molds is usually used.

[0055] Therefore, to accommodate the production of small-batch, large-sized iron molds using sand casting, multiple types of castings often need to be produced simultaneously on a single sand casting production line. A single sand casting machine is used to complete the sand casting of multiple iron molds of different shapes. To address this, the sand casting process is broken down into three steps: mold assembly (iron mold and model), sand injection molding (iron mold), and separation of the iron mold and model after sand injection molding. Equipment for each step is developed accordingly.

[0056] This application describes a device for completing the process of separating the iron mold and the model during the molding process. It aims to meet the logistics and transportation needs of a large-scale iron mold sand casting production line by separating the iron mold from the model during the production line. Based on the requirements for separating the iron mold and the model during molding in a large-scale iron mold sand casting production line, and the requirement for separate transportation of the model and the iron mold after molding, this invention uses an electrically driven roller conveyor to send the iron mold / model after sand injection molding into the molding separation station of this application. The model locking mechanism is activated to fix the model onto the roller conveyor. A low-flow, high-pressure pump in a dual-pump hydraulic lifting mechanism lifts the iron mold upwards. After the iron mold and the model have separated by a certain distance, a high-flow, low-pressure pump in the dual-pump hydraulic lifting mechanism is activated to lift the iron mold... The mold and model are completely separated until the lower plane of the iron mold is a certain distance above the highest point of the model, achieving energy-saving operation of mold separation between the iron mold and the model. Then, the iron mold after complete separation is moved to the upper part of the iron mold logistics conveyor roller of the production line by the iron mold transfer trolley mechanism. Then, the high-flow low-pressure pump in the dual-pump hydraulic lifting mechanism is used to lower the iron mold and place it on the iron mold logistics conveyor roller of the production line below. Then, the iron mold can be sent to the next process of the production line through the iron mold logistics conveyor roller.

[0057] The working principle of the mold-lifting and box-shifting device in the multi-variety large casting iron mold sand casting production line of this embodiment is as follows: For iron mold sand casting production used for mass casting, the molding method of the iron mold is that the mold is always fixedly installed on the sand molding machine. Figures 5-6 On the worktable, the iron mold enters the sand molding station of the sand molding machine via roller conveyor. The model rises on the worktable to complete the mold closing operation with the iron mold. Sand injection molding completes the molding operation of the iron mold. After the mold solidifies, the worktable descends to separate the iron mold from the model, completing the mold removal and separation operation of the iron mold and model. The iron mold is moved out of the sand molding machine via roller conveyor, completing the sand molding operation of the iron mold.

[0058] From the appendix Figures 5-6(The specific structure includes a sand-coating molding machine 2-1, a mold running edge 2-2, a mold plate and base 2-3, model and workbench fixing bolts 2-4, a mold-lifting workbench 2-5, a mold conveying roller conveyor 2-6, a mold-lifting hydraulic cylinder 2-7, a conveying roller 2-8, a mold-one 2-9, and a model-one 2-10.) As can be seen, the traditional mold-closing and mold-lifting device between the mold and the model is generally included within the sand-coating molding device. The mold-closing and mold-lifting operation involves fixing the model to the mold-closing / molding device workbench with bolts. The mold running edge contacts the mold conveying roller conveyor rollers at a certain distance above the workbench. When the mold and model are separated, the mold remains stationary on the mold conveying roller conveyor rollers, and the model is separated from the mold by the descent of the mold-lifting device. One sand-coating molding machine is needed for each of the upper or lower molds of a product to complete the sand-coating molding operation for that product.

[0059] For the simultaneous production of multiple varieties of large castings in small batches using iron molds, there are several challenges: First, each variety of iron mold often requires multiple iron molds to form the complete mold needed for casting production; second, each iron mold is extremely heavy and bulky, weighing from several tons to tens of tons, and its size is several meters, resulting in significant costs for molds and iron molds used in casting production. In particular, the number of iron molds that can be used for each variety of casting is greatly limited, often requiring only one set; third, the investment in sand molding equipment for producing multiple varieties of large castings simultaneously is enormous, as it is impossible to have one or more sand molding machines for each variety of large castings produced at the same time.

[0060] To address the challenges of producing small batches of large castings of various types using sand-coated iron molds, the traditional sand-coated molding method for iron molds has been completely broken down. Instead of using a single sand-coated molding device to complete both the sand-shooting and sand-coating processes of the iron mold and the separation and demolding process of the iron mold and the model, the process is now broken down into two devices: a sand-shooting and sand-coating molding device and a mold-separation and demolding device.

[0061] like Figures 7-8 As shown in the figure, the casting model 3-1, the iron mold 3-2, the iron mold running edge 3-3, the iron mold gripping and conveying plane 3-4, the model locking wedge surface 3-5, the model plate 3-6, the model conveying plane 3-7, and the iron mold casting running edge 3-8 are included.

[0062] This application describes a device designed to facilitate the separation of iron molds and models during the casting process, and to meet the logistical requirements for the separation of molds and models in large-scale iron mold sand casting production lines. To separate different types of iron molds and their corresponding models, a through-type separation operation mode is adopted. This involves separating different completed sand-casting and sand-coating iron molds and models (using the model and mold structure compatible with the device described in this application, see attached document). Figures 7-8 The iron mold is conveyed into the device of this application by a motorized conveyor. The model is fixed and locked in the mold separation station of the device by the model locking mechanism. The iron mold is lifted upward by the iron mold lifting mechanism to achieve complete separation of the iron mold from the model. Then, according to the production process requirements of the multi-variety large casting iron mold sand casting production line, the iron mold is completely moved away from the model conveying roller to the iron mold conveying roller by the box transfer conveyor. The iron mold can be motorized and conveyed into the next process of the multi-variety large casting iron mold sand casting production line.

[0063] like Figure 9 As shown in this embodiment, the process flow of the mold-removing and box-moving device for the iron mold in the multi-variety large iron mold sand casting production line is as follows: The iron mold and model after sand molding and solidification are entered into the mold-removing separation position of the iron mold and model of this application device to complete the mold-removing separation operation. Then the model continues to be conveyed forward and can enter the next working station of the model in the multi-variety large iron mold sand casting production line (such as: model cleaning, heating, spraying, etc.). The iron mold is moved to the iron mold conveying moving mechanism through the line-changing operation mechanism of this application device (completely separated from the model conveying moving mechanism in the production line). The iron mold can be conveyed to the next iron mold running station in the large iron mold sand casting production line (such as: core-laying station, box closing, pouring, etc.).

[0064] like Figures 10-14 As shown, the mold separation and line-changing box-moving device is equipped with a mold / model mold separation station 1, a mold / casting line-changing conveying starting station 2, a mold / casting mold mold separation / box-moving line-changing unit mechanism 3, a mold / casting line-changing operation unit mechanism 4, and a model conveying operation unit mechanism 5.

[0065] The iron mold / model is transported and operated by the model conveying and operating unit mechanism. The iron mold / model is moved and separated by the model and the mold lifting / moving unit mechanism. The iron mold / model is transported and operated by the iron mold conveying and operating unit mechanism. The iron mold / model lifting / moving unit mechanism is used to separate the iron mold / model and move the iron mold / model to the production line. Finally, the iron mold / model lifting and separating of multiple different iron molds / models of multiple types of castings on the multi-variety large casting iron mold sand casting production line and the iron mold / model moving and changing operation are realized.

[0066] like Figures 15-17 As shown, the iron mold casting mold lifting / moving box relocation unit mechanism 3 includes a mold lifting / relocation moving trolley track frame 31, a column 32, a mold lifting / relocation moving trolley 33, a mold lifting and lifting hydraulic cylinder 34, an iron mold casting gripping hook moving beam 35, a mold lifting and lifting upper beam 36, a mold lifting guide rod 37, a guide sleeve 38, and an iron mold casting gripping hook 39, etc.

[0067] The mold-lifting / line-changing moving trolley track frame 31 is fixedly connected to the column 32. The mold-lifting / line-changing moving trolley 33 and other components in the iron mold casting mold-lifting / box-moving and line-changing unit mechanism 3 can move back and forth on its track. The mold-lifting / line-changing moving trolley 33 uses a servo motor to directly drive the trolley wheels to rotate, which allows the mold-lifting / line-changing moving trolley 33 to move back and forth on the track on the mold-lifting / line-changing moving trolley track frame 31. Because the weight of the iron mold casting of large castings is tens to hundreds of tons, and the iron mold has huge external dimensions, with a plane dimension of several meters, in order to reduce the manufacturing cost and operating cost of the device, this device uses double hydraulic cylinders for the lifting and mold-lifting operation of the iron mold casting. The double hydraulic cylinders are raised and lowered synchronously through a hydraulic synchronizer to ensure smooth operation when lifting the iron mold and the model.

[0068] In this embodiment, two mold-lifting hydraulic cylinders 34 are fixed on the upper planes on both sides of the mold-lifting / line-changing moving trolley 33. The piston rod heads are connected to the iron mold casting gripping hook moving beam 35 through the connector. By lifting and lowering the mold-lifting hydraulic cylinders 34, the iron mold lifting gripping hook can be driven to complete the mold-lifting separation operation of the iron mold casting and the line-changing operation of the iron mold casting.

[0069] In this embodiment, four iron mold gripping hooks 39 are arranged symmetrically in pairs and fixed on the lower plane of the iron mold gripping hook moving beam 35. The iron mold gripping hooks 39 can perform gripping operations on the iron mold, and are used for separating the iron mold from the model and for changing the line of the iron mold.

[0070] In this embodiment, four mold-lifting guide rods 37 are arranged symmetrically. The lower flange of the mold-lifting guide rod 37 is installed on the upper plane of the iron mold casting gripping hook beam 35. The upper part of the mold-lifting guide rod 37 is installed together with the mold-lifting lifting beam 36, so that the mold-lifting lifting beam 36, the mold-lifting guide rod 37, and the iron mold casting gripping hook beam 35 form a completely fixed and connected overall frame structure.

[0071] In this embodiment, four mold-lifting guide rods 37 pass through guide sleeves 38 that are fixedly installed on the body of the mold-lifting / line-changing moving trolley 33 and correspond to the installation positions of the four mold-lifting guide rods 37. As the piston of the mold-lifting hydraulic cylinder 34 moves up and down, the mold-lifting guide rods 37 can slide up and down in the guide sleeves 38, so that the mold-casting hook 39 moves up and down in a balanced manner.

[0072] like Figures 18-20 As shown, the model conveying and operating unit mechanism 5 includes roller support 51, column 52, support beam 53, motorized roller wheel 54, and model plate clamping device 55, etc.

[0073] Two roller support brackets 1 are fixedly installed together with multiple columns 52, and the supporting beam 53 is fixedly installed together with the two roller support brackets 51. After the three are fixed, they form a complete roller frame structure. The motorized roller wheels 54 used for model movement are installed on the two roller support brackets 51 at a certain distance. When the model is moving, the bottom plane of the model plate is in contact with the circumferential surface of the motorized roller wheel 54. As the motorized roller wheel rotates, the model plate moves linearly on the model conveying and running unit mechanism 5. Two to three pairs of model plate clamping devices 55 are fixedly installed in the gap between the motorized roller wheels 54 of the roller support 51 on both sides of the iron mold / model mold separation station 1. The model plate clamping devices 55 are used to clamp and fix the model tightly on the model conveying moving unit when the iron mold casting and the mold are separated, so that the model will not rise with the iron mold casting, thereby completing the mold separation operation between the model and the iron mold casting. The model plate clamping device 55 adopts a movable wedge. By moving the wedge, it tightly fits the wedge surface at the corresponding position of the model plate, thereby firmly fixing the model plate on the model conveyor roller.

[0074] like Figures 21-23 As shown, the iron mold casting conveying and operating unit mechanism 4 includes a side roller track support 41, a motorized side roller 42, a support column 43, a support beam 44, and an iron mold grabbing hook receiving groove 45, etc.

[0075] Two side roller conveyor supports 41 are installed together with multiple support columns 43, and the support beam 44 is fixed together with the support columns 43. After the three are fixed, they form a complete side roller conveyor frame structure. The motorized side roller 42 used for moving iron mold casting operations is installed in the two side roller conveyor supports 41 at a certain distance. When the iron mold is moving, the lower plane of the running edge of the iron mold contacts the circumferential surface of the motorized side roller 42. As the motorized side roller 42 rotates, the iron mold moves linearly along the side roller track. On the side roller track supports 41 located at the iron mold conveying and changing unit position, there are iron mold gripping hook receiving slots. When the iron mold is placed on the motorized side roller 42 at the iron mold conveying and changing unit position, the iron mold gripping hooks descend. When the iron mold gripping plane needs to be lower than the upper edge of the circumferential surface of the side roller, the iron mold running edge touches the upper edge of the circumferential surface of the side roller, and the iron mold is completely seated on the motorized side roller 42 of the iron mold conveying and changing line unit. At this time, the iron mold gripping hook is inserted into the side roller support 41. Therefore, an iron mold gripping hook receiving groove needs to be opened at the position where the iron mold gripping hook falls on the side roller support 41. The upper plane of the iron mold gripping hook receiving groove should be a certain distance lower than the lowest plane of the iron mold gripping hook to ensure that the lower plane of the iron mold running edge is in complete contact with the motorized side roller of the iron mold conveying and changing line unit.

[0076] like Figures 24-32As shown, the operation process and method of the mold lifting and box moving line changing device in a mold sand casting production line for simultaneously producing multiple small batches of large castings of different varieties are as follows: The mold lifting / box moving line changing unit mechanism 3 is located above the mold / model lifting separation station 1, and the mold gripping hook 39 in the mold lifting / box moving line changing unit mechanism 3 is at its highest point; the mold lifting hydraulic cylinder 34 system in the mold lifting / box moving line changing unit mechanism 3 is in low-pressure, high-capacity lowering operation mode, the piston of the mold lifting hydraulic cylinder 34 descends, driving the mold gripping hook 39 to descend, when the piston of the mold lifting hydraulic cylinder 34 descends to the middle position, the mold lifting hydraulic cylinder 34... When the piston of cylinder 34 stops descending, the upper plane of the mold-grabbing hook 39 is 10-20 mm lower than the lower plane of the mold edge after mold closing. The motorized roller conveyor of model conveying unit 5 is activated, transporting the mold / model after sand injection and molding to the mold / model working position of mold lifting and separation station 1, where it stops. The model locking device activates, firmly fixing the model to the model conveying roller conveyor. The mold lifting / moving unit 3 is activated, raising the mold lifting hydraulic cylinder 34. The system of the mold lifting / moving unit 3 is activated. In high-pressure, low-speed mode, the hydraulic cylinder generates a stable lifting force of several hundred tons. The piston of the lifting hydraulic cylinder 34 rises, driving the iron mold casting gripping hook 39 to rise. Once the upper plane of the gripping hook 39 is in complete contact with the lower plane of the iron mold's running edge, it continues to rise. The mold is tightly locked and fixed to the iron mold / model conveyor roller by the mold locking mechanism, preventing the mold from rising with the iron mold. The iron mold continues to rise, and as the piston of the lifting hydraulic cylinder 34 in the iron mold casting lifting / moving box line-changing unit mechanism 3 rises, the separation operation between the iron mold casting and the model begins. The lifting gripping hook continues to rise 30-50 mm. Once the iron mold and the model are completely separated, the high-pressure, low-speed operation mode of the lifting hydraulic cylinder 34 in the iron mold lifting / moving unit mechanism 3 is switched to a low-pressure, high-capacity operation mode, driving the lifting hook to continue rising, causing the iron mold to continue rising until the lower plane of the iron mold is 30-40 mm higher than the highest surface of the model, at which point it stops. At this point, the iron mold and the model are completely separated, thus completing the mold separation operation between the iron mold and the model. The mold lifting / moving trolley 33 in the iron mold lifting / moving unit mechanism 3 is started, moving the iron mold after mold lifting from the iron mold / model mold lifting separation station 1 to the iron mold conveying and running unit mechanism 4 and then stopping.In the mold lifting / moving unit mechanism 3, the mold lifting hydraulic cylinder 34 activates the low-pressure, high-capacity descent mode, driving the mold lifting hook to descend. The mold then lowers accordingly. When the lower plane of the mold's running edge contacts the upper plane of the motorized side roller 42 on the motorized side roller conveyor of the mold conveying unit mechanism 4, the mold stops descending. The piston of the mold lifting hydraulic cylinder 34 continues to descend a certain distance, completely separating the upper plane of the mold lifting hook from the lower plane of the mold's running edge. At this point, the distance between the upper plane of the mold lifting hook and the lower plane of the mold's running edge is 10-20 mm, and the piston of the mold lifting hydraulic cylinder 34 has reached its lowest point. Simultaneously, the model locking device on the model conveying roller conveyor in the mold / model separation station 1 moves outward and loosens, releasing the locking between the roller conveyor and the model. The motorized roller conveyor in the model conveying unit mechanism 5 can then be activated, allowing the model to gradually move out of the mold / model separation station 1 and into the large mold sand casting production line. The production line moves to a different station; simultaneously, the motorized side roller conveyor in the mold conveying unit 4 starts operating, gradually moving the molded casting, which has completed the mold removal and box transfer process, out of the mold conveying unit station. The side roller conveyor in the mold conveying unit 4 then transports the molded casting to the next operating unit of the large mold sand casting production line. After the molded casting leaves the mold conveying unit station, the mold lifting hydraulic cylinder 34 activates its low-pressure, high-capacity lifting mode, raising the piston to its highest position, causing the mold gripping hook to reach its highest position. The mold removal / transferring trolley 33 in the mold removal / box transfer unit 3 starts operating, moving the mold removal / box transfer unit 3 from the mold conveying unit position to the mold / model separation station 1 position and then stopping. This completes one mold / model separation and mold / model transfer operation.

[0077] On the sand-coated iron mold production line for multiple types of large castings, after the sand coating and sand shooting molding are completed, different types of large iron molds / models enter the mold-lifting and box-moving device in sequence. By cycling through the above-mentioned mold-lifting separation and iron mold box-moving line-changing operations, the mold-lifting separation operation of iron molds for different types of large castings and the subsequent iron mold box-moving line-changing operation can be realized. This satisfies the mold-lifting operation of different iron molds in the sand-coated iron mold casting production line for multiple types of large castings, and meets the logistics transportation operation requirements of iron molds in the large iron mold sand-coated iron mold production line.

[0078] The device of this application uses multi-point sensing elements, electrical components, PLC controllers, logic control software, etc., to realize the automated operation of the device of this invention.

[0079] In view of the process requirements of the production line for producing multiple varieties of small batches of large castings in iron mold sand coating, as well as the logistics transportation requirements of the model and iron mold in the production line, the sand coating molding operation of iron mold is decomposed into: (1) the sand spraying and sand coating operation of iron mold; (2) the separation of iron mold and model, the model movement and transportation after the separation of iron mold and model, and the iron mold line change and box transfer transportation process.

[0080] This embodiment is a device developed to complete the second process described above. The technical solution and route of this invention are as follows: A motorized roller conveyor is used to transport the iron mold / model, after sand shooting and curing operations, into the mold separation station of the device. The model is fixed and locked by a model locking mechanism. A hydraulic lifting mold separation mechanism is used to separate the iron mold casting from the model. After complete separation, the model mold is transported away from the device via the motorized roller conveyor of the model mold, and connected to the motorized roller conveyor of the production line outside the device. The model mold is then transported to the next mold operation process in the iron mold sand casting production line. The completely separated iron mold casting is moved out of the mold separation station of the device via the shifting and repositioning mechanism of this invention. The shifting and repositioning mechanism moves the iron mold casting to a moving motorized roller conveyor parallel to the model mold motorized roller conveyor. The hydraulic lifting mold separation mechanism places the iron mold casting on this motorized roller conveyor, which then transports the iron mold casting to the next operation station. This achieves parallel transport of the model and iron mold casting after mold separation, meeting the requirements for repositioning the iron mold casting logistics process in the production line.

[0081] This application differs from the traditional sand-coating molding mode of iron mold casting production lines. This application is an integrated innovation that combines the mechanisms and processes of various iron mold sand casting equipment to ultimately form an iron mold casting production line for multi-variety, small-batch, large castings, with iron mold mold separation and iron mold mold transfer and line-changing conveying device.

[0082] Based on the above description, those skilled in the art are already able to implement it.

[0083] Furthermore, it should be noted that the specific embodiments described in this specification may have different shapes and names of parts and components. The above description in this specification is merely an illustrative example of the structure of the present invention.

Claims

1. A mold-removing and box-shifting device for iron mold casting in an iron mold sand casting production line, comprising an iron mold / model mold-removing separation station (1), an iron mold casting line-shifting conveying starting station (2), an iron mold casting mold-removing / box-shifting unit mechanism (3), an iron mold casting conveying operation unit mechanism (4), and a model conveying operation unit mechanism (5). The process flow mode of this device is as follows: the model conveying operation unit mechanism (5) realizes the operation of iron molds / models for different castings and the entry and exit of models from the iron mold / model mold-removing separation station (1); the iron mold casting conveying operation unit mechanism (4) realizes the conveying operation of iron molds for different castings; the iron mold casting mold-removing / box-shifting unit mechanism (3) realizes the mold-removing separation of iron molds and models for different castings and the box-shifting operation of iron molds for different castings. Finally, after the model and iron mold are separated, the model and iron mold are conveyed and operated in parallel on the iron mold sand casting production line. The device is characterized by: The mold lifting / moving and repositioning unit mechanism (3) includes a mold lifting / repositioning moving trolley track frame (31), a column (32), a mold lifting / repositioning moving trolley (33), a mold gripping hook beam (35), a mold lifting and lowering upper beam (36), multiple mold lifting and lowering hydraulic cylinders (34), multiple mold lifting guide rods (37), multiple guide sleeves (38), and multiple mold gripping hooks (39). The mold lifting / repositioning moving trolley track frame (31) is connected to the column (32), and the mold lifting / repositioning moving trolley (33) moves back and forth on the track on the mold lifting / repositioning moving trolley track frame (31). The operation is as follows: Multiple mold lifting hydraulic cylinders (34) are installed on the upper plane of both sides of the mold lifting / line changing moving trolley (33). The piston rod head of the mold lifting hydraulic cylinder (34) is connected to the iron mold casting gripping hook moving beam (35) through the connector. Multiple iron mold casting gripping hooks (39) are installed on the lower plane of the iron mold casting gripping hook moving beam (35). Multiple mold lifting guide rods (37) and multiple guide sleeves (38) slide against each other. The lower flange of the mold lifting guide rod (37) is fixed on the upper plane of the iron mold casting gripping hook moving beam (35). The upper part of the mold lifting guide rod (37) is fixed to the upper mold lifting beam (36). The model conveying unit mechanism (4) includes a motorized side roller (42), a support beam (44), a metal hook receiving groove (45), multiple support columns (43), and multiple side roller conveyor supports (41). The multiple side roller conveyor supports (41) are fixed to the multiple support columns (43), and the support beam (44) is connected to the support columns (43). The motorized side roller (42) is installed in the two side roller conveyor supports (41) at a certain distance. The side roller conveyor supports (41) have metal hook receiving grooves (45) at the falling position of the metal hooks. The structure (5) includes a support beam (53), a motorized roller (54), multiple roller supports (51), multiple columns (52), and multiple pairs of model plate clamping devices (55). The multiple roller supports (51) are connected to the multiple columns (52), the support beam (53) is fixedly connected to two roller supports (51), and the motorized rollers (54) are installed on the two roller supports (51) at a certain distance. The model conveying and running unit mechanism (5) has 2 to 3 pairs of model plate clamping devices (55) fixedly installed in the gap between the motorized rollers (54) of the roller supports (51) on both sides of the iron mold / model separation station (1).

2. The mold-lifting and box-shifting device for iron mold casting production line according to claim 1, characterized in that: There are four iron mold casting gripping hooks (39), which are arranged symmetrically in pairs and fixed on the lower plane of the iron mold casting gripping hook moving beam (35).

3. The mold-lifting and box-shifting device for iron mold casting production line according to claim 1, characterized in that: There are four mold-lifting guide rods (37), which are arranged symmetrically. The mold-lifting lifting beam (36), the mold-lifting guide rods (37), and the iron mold casting grabbing hook beam (35) form an integral frame structure.

4. The mold-lifting and box-shifting device for iron mold casting production line according to claim 1, characterized in that: The mold-lifting hydraulic cylinder (34) adopts a dual hydraulic cylinder lifting method with a hydraulic synchronizer.

5. The mold-lifting and box-shifting device for iron mold casting production line according to claim 1, characterized in that: The model plate clamping device (55) adopts a movable wedge.

6. The mold-lifting and box-shifting device for iron mold casting production line according to claim 1, characterized in that: When the model is moving, the bottom plane of the model plate is in contact with the circumferential surface of the motorized roller (54). As the motorized roller (54) rotates, the model plate moves in a straight line on the model conveying and running unit mechanism (5).

7. The mold-lifting and box-shifting device for iron mold casting production line according to claim 1, characterized in that: The iron-shaped gripping hook receiving groove (45) is set at the position where the iron-shaped gripping hook falls on the side roller roller support (41). The upper plane of the iron-shaped gripping hook receiving groove (45) should be a certain distance lower than the lowest plane of the iron-shaped gripping hook.

8. The mold-lifting and box-shifting device for iron casting according to claim 1, characterized in that: In the production line for sand-coated casting of various large castings, the separation of the iron mold / model and the subsequent transfer of the iron mold on different lines enable the separate transport of the model and the iron mold on the production line.

9. A method for operating the mold-removing and box-shifting device for iron mold casting in an iron mold sand casting production line, comprising the mold-removing and box-shifting device for iron mold casting in an iron mold sand casting production line as described in any one of claims 1 to 8, used in an iron mold sand casting production line that simultaneously produces multiple small batches of large castings of different varieties, characterized in that: The specific steps are as follows: The mold lifting / moving box line-changing unit mechanism (3) is located above the mold lifting / model separation station (1), and the mold gripping hook (39) in the mold lifting / moving box line-changing unit mechanism (3) is located at the highest point; The mold lifting hydraulic cylinder (34) system in the iron mold casting mold lifting / box shifting unit mechanism (3) starts the low-pressure large-capacity descent operation mode. The piston of the mold lifting hydraulic cylinder (34) descends, driving the iron mold casting gripping hook (39) to descend. When the piston of the mold lifting hydraulic cylinder (34) descends to the middle position, the piston of the mold lifting hydraulic cylinder (34) stops descending. At this time, the upper plane position of the iron mold casting gripping hook (39) is 10-20 mm lower than the lower plane position of the iron mold running edge after the iron mold / model is closed. The motorized roller conveyor in the model conveying unit (5) is activated, and the iron mold / model after the iron mold casting sand shooting and sand covering molding is conveyed into the iron mold / model working position of the iron mold / model separation station (1) and then stopped. The model locking device is activated to firmly fix and lock the model on the model conveying roller conveyor. The lifting hydraulic cylinder (34) in the mold lifting / moving box line change unit mechanism (3) is activated to lift. The lifting hydraulic cylinder (34) system in the mold lifting / moving box line change unit mechanism (3) is activated to high pressure and low speed mode. In this mode, the hydraulic cylinder generates hundreds of tons of stable lifting force. The piston of the lifting hydraulic cylinder (34) rises, which drives the mold gripping hook (39) to rise. When the upper plane of the mold gripping hook (39) is in complete contact with the lower plane of the mold running edge, it continues to rise. The model is locked and fixed on the mold / model conveying roller by the model locking mechanism, so that the model will not rise with the rise of the mold. The mold continues to rise. As the piston of the lifting hydraulic cylinder (34) in the mold lifting / moving box line change unit mechanism (3) rises, the mold separation operation between the mold and the model begins. The lifting gripping hook continues to rise 30-50 mm, and the mold and the model are completely separated. In the iron mold casting mold lifting / box shifting unit mechanism (3), the high-pressure low-speed operation mode of the mold lifting hydraulic cylinder (34) system is switched to the low-pressure large-capacity operation mode, which drives the mold lifting hook to continue to rise, so that the iron mold casting continues to rise until the lower plane of the iron mold casting is 30-40 mm higher than the highest surface of the model and then stops. At this time, the iron mold casting and the model are completely separated, thus completing the mold lifting and separation operation between the iron mold casting and the model. The mold-lifting / transferring trolley (33) in the mold-lifting / transferring line-changing unit mechanism (3) is started, and the mold-lifted iron mold is moved from the mold-lifting / model separation station (1) to the mold-conveying unit mechanism (4) and then stopped; the mold-lifting lifting hydraulic cylinder (34) in the mold-lifting / transferring line-changing unit mechanism (3) is opened in the low-pressure large-capacity operation and descent mode, which drives the mold-lifting gripping hook to descend, and the iron mold is lowered accordingly. When the lower plane of the running edge of the iron mold is aligned with the motorized side roller of the mold-conveying unit mechanism (4), When the upper plane of the motorized side roller 1 (42) comes into contact, the iron mold no longer descends; the piston of the mold lifting hydraulic cylinder (34) continues to descend a certain distance, so that the upper plane of the iron mold gripping hook is completely separated from the lower plane of the iron mold running edge. At this time, the distance between the upper plane of the iron mold gripping hook and the lower plane of the iron mold running edge is 10-20 mm, and the piston of the mold lifting hydraulic cylinder (34) has descended to the lowest point; at the same time, the model locking device on the model conveying roller in the iron mold / model mold separation station (1) moves outward and is released, and the fixed locking between the roller and the model is released accordingly; When the motorized roller conveyor in the model conveying operation unit (5) is started, the model can be gradually moved out of the iron mold / model mold separation station (1) and enter the next operating station of the multi-variety large casting iron mold sand coating casting production line; at the same time, the motorized side roller conveyor in the iron mold casting conveying operation unit (4) is started to operate, and the iron mold casting that has completed the mold removal operation and box transfer line change is gradually moved out of the iron mold casting conveying operation line change unit station. Through the operation of the side roller conveyor in the iron mold casting conveying operation unit (4), the iron mold casting can be sent to the next operating unit of the multi-variety large casting iron mold sand coating casting production line. After the iron mold is moved out of the iron mold conveying and changing line unit station, the mold lifting hydraulic cylinder (34) starts the low-pressure large-capacity lifting operation mode. The piston rises to the highest position, so that the iron mold grab hook rises to the highest position. The mold lifting / changing line moving trolley (33) in the iron mold mold lifting / moving box changing line unit mechanism (3) starts to start. The iron mold mold lifting / moving box changing line unit mechanism (3) is moved from the iron mold conveying and running unit position to the iron mold / model mold lifting separation station (1) unit position and then stops. Thus, the mold lifting separation of iron mold / model and the changing line conveying operation of model and iron mold are completed.

10. The working method of the mold-lifting and box-shifting device in the iron mold sand casting production line according to claim 9, characterized in that: A single mechanism can simultaneously perform the functions of mold casting and model removal, as well as the mold relocation function.

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