A molding machine

Abstract

The present invention relates to the technical field of molding equipment, a molding machine, comprising a frame, a main sand box and a sand shooting mechanism provided on the frame, an upper frame assembly and a lower frame assembly arranged in a longitudinal alignment provided on the frame, a middle frame capable of horizontal movement provided between the two, the middle frame being used to install a mold, an upper sand frame provided at the bottom of the upper frame assembly, a lower sand frame provided at the top of the lower frame assembly, the sides of the upper and lower sand frames being respectively connected to the main sand box through a sand shooting mechanism, the upper and lower sand frames clamping the middle frame to form a sand box structure, a pressing plate provided in the upper sand frame, a contact provided in the lower sand frame, a sand replenishment channel provided in the contact, and the sand replenishment channel being connected to a sand replenishment box provided on the frame. The present invention helps to solve the problem that the equipment does not have a precise sand replenishment function and cannot meet operational requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of molding equipment, in particular to a molding machine. Background Art

[0002] The molding machine is a casting equipment used to make sand molds. Its main functions are: filling sand, filling the loose molding sand into the sand box; compacting the molding sand, making the loose molding sand in the sand box compacted by different methods such as vibration, compaction, vibration pressure, and shot pressure, so that the molding sand has sufficient strength during transportation and pouring; demolding, using different mechanisms to remove the pattern from the compacted sand mold.

[0003] At present, the molding sand molding process mainly relies on the pressing plate, plug and mold to press and shape the molding sand. The pressing action is relatively simple, especially in the contour detail area inside the mold, which does not have the precise sand filling function, resulting in the inability to meet the corresponding precision requirements. Summary of the Invention

[0004] The purpose of the present invention is to provide a molding machine that helps to solve the problem that the equipment does not have the precise sand replenishing function and cannot meet the operation requirements.

[0005] In order to achieve the above object, the present invention adopts such technical solution:

[0006] A molding machine comprises a frame, wherein a main sand box and a sand shooting mechanism are provided on the frame, an upper frame assembly and a lower frame assembly arranged in longitudinal alignment are provided on the frame, a middle frame which can move horizontally is provided between the two, and the middle frame is used to install the mold, an upper sand frame is provided at the bottom of the upper frame assembly, and a lower sand frame is provided at the top of the lower frame assembly, the sides of the upper sand frame and the lower sand frame are respectively connected to the main sand box through the sand shooting mechanism, and the upper sand frame and the lower sand frame clamp the middle frame to form a sand box structure, a pressure plate is provided in the upper sand frame, and a contact is provided in the lower sand frame, a sand replenishing channel is provided in the contact, and the sand replenishing channel is connected to the sand replenishing box provided on the frame.

[0007] Preferably, the contact is a hollow columnar structure, and its outer contour is adapted to the inner contour of the mold. A partition is provided inside the contact, and the partition divides the internal cavity of the contact into a sand cavity and an air cavity distributed inside and outside respectively. Sand outlet holes and air outlet holes are provided on the contact, and the sand cavity is connected to the external space through the sand outlet holes, and the air cavity is connected to the external space through the air outlet holes.

[0008] Preferably, the plurality of air outlet holes are evenly distributed on the outer side wall of the contact.

[0009] Preferably, the air outlet hole is a through hole structure that is narrow inside and wide outside.

[0010] Preferably, the sand replenishing box includes an air box fixedly mounted on one side of the frame, the air box is provided with an air inlet and an exhaust port for connecting to an air compressor, the top of the air box is connected to a material injection hopper via a pipeline, an opening and closing mechanism is provided on the pipeline between the material injection hopper and the air box, a double-layer sand replenishing pipe is connected to the bottom of the air box, the top of the sand replenishing pipe is inserted into the air box and communicated with the pipeline at the bottom of the material injection hopper, and the other end of the sand replenishing pipe is communicated with a contact, forming a double-channel structure distributed inside and outside;

[0011] The sand replenishing pipe is located in the inner area of ​​the air box and is a breathable part. The breathable part adopts a filter screen as an isolation structure. The pores of the filter screen are smaller than the size of the molding sand. The molding sand in the hopper can enter the sand cavity inside the contact through the inner cavity of the sand replenishing pipe, and pass through the sand outlet hole to the outside of the contact with the help of high-pressure gas; the high-pressure gas in the air box can enter the air cavity inside the contact through the outer cavity of the sand replenishing pipe, and pass through the air outlet hole to the outside of the contact. Part of the high-pressure gas in the air box will pass through the filter screen and enter the inner cavity of the sand replenishing pipe, serving as a feeding drive source for the molding sand in the sand replenishing pipe.

[0012] Preferably, the pressing plate includes a first pressing plate and a second pressing plate arranged inside and outside, the first pressing plate and the second pressing plate are arranged horizontally, and are independently connected to a longitudinal driving device.

[0013] Preferably, the pressure plate includes a first pressure plate and a second pressure plate arranged inside and outside, the first pressure plate and the second pressure plate are arranged horizontally, the tops of both are connected to the bottom of the horizontal transition plate, and the top of the transition plate is connected to a longitudinal drive device; a longitudinal buffer structure is provided between the first pressure plate and the transition plate.

[0014] Preferably, the buffer mechanism includes a support rod fixed to the top of the first pressure plate, the support rod is vertically arranged, and a spring is provided between the support rod and the transition plate.

[0015] Preferably, a sealing member is provided between the first pressing plate and the second pressing plate.

[0016] Preferably, the closure member adopts a membrane-like flexible filter structure, and the pores of the filter are smaller than the size of the molding sand.

[0017] Compared with the prior art, the present invention has at least the following advantages:

[0018] 1. The present invention sets the contactor into a structure with a feeding cavity inside. When the contact is initially squeezed into the mold cavity and retreated, the sand cavity can transport molding sand to the area close to the inner contour of the mold, forming a sand replenishment operation in a specific area. When the contact is squeezed again, the molding sand in the inner contour area of ​​the mold can be fully compacted, thereby ensuring that the local details of the mold can be shaped and improving the molding quality.

[0019] 2. The interior of the contact of the present invention has a double-layer cavity separated by an inner and an outer layer. The inner sand cavity is used to deliver sand, and the outer air cavity is used to deliver high-pressure gas. When the molding sand passes through the sand outlet hole to the inner area of ​​the mold, the high-pressure gas in the air cavity will enter the area from the air outlet hole, blow away the replenished molding sand, and evenly distribute it to various areas of the inner contour of the mold, and pre-compact the loose molding sand in various areas of the inner contour of the mold, so that the sand replenishment is more uniform and stable; in addition, the high-pressure gas can also clean the outer surface of the contact, avoiding the molding sand sticking to the contact and affecting the subsequent extrusion effect of the contact.

[0020] 3. The present invention arranges the sand replenishing pipe located inside the air box into a filter structure, which can meet the effects of air passage and sand blocking, so that the high-pressure gas in the air box can enter the inner cavity of the sand replenishing pipe to provide driving force for the transportation of molding sand, and can also enter the air cavity in the contact along the outer cavity of the sand replenishing pipe.

[0021] 4. The present invention arranges the pressing plates into a first pressing plate and a second pressing plate distributed inside and outside. The two pressing plates can be differentiated into regions according to the position of the mold, and the compaction degree of different regions can be controlled separately, so that the molding sand in each region of the sand box has a sufficient compaction state after extrusion. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural diagram of a molding machine in one embodiment;

[0023] Figure 2 for Figure 1 Schematic diagram of the installation structure of the upper and lower frame components;

[0024] Figure 3 for Figure 2 Schematic diagram of the structure of the middle and lower frame components;

[0025] Figure 4 for Figure 3 Schematic diagram of the installation structure of the middle contact;

[0026] Figure 5 for Figure 4 a cross-sectional view of the middle contact;

[0027] Figure 6 Schematic diagram of the structure of the sand filling box;

[0028] Figure 7 This is a simplified schematic diagram of the sand compaction process;

[0029] Figure 8 This is a simplified structural diagram of an upper frame assembly in one embodiment;

[0030] Figure 9 Schematic diagram of the simplified structure of the upper frame assembly in another embodiment.

[0031] Labels in the figure: 1, frame; 11, gas tank; 2, upper frame assembly; 21, upper sand frame; 22, first pressure plate; 23, second pressure plate; 24, closing member; 25, support rod; 251, spring; 26, first oil cylinder; 27, second oil cylinder; 28, transition plate; 3, lower frame assembly; 31, lower sand frame; 32, first lifting plate; 321, third oil cylinder; 33, second lifting plate; 331, fourth oil cylinder; 34. Contact; 341. Interlayer; 342. Sand cavity; 343. Air cavity; 344. Sand outlet hole; 345. Air outlet hole; 346. Sand feeding pipe; 35. Fifth oil cylinder; 36. Guide rod; 4. Middle frame; 5. Main sand box; 51. Sand shooting port; 6. Sand feeding box; 61. Filling hopper; 62. Gate valve; 63. Air box; 631. Air inlet; 632. Exhaust port; 64. Filter; 7. Mold; 8. Molding sand. DETAILED DESCRIPTION

[0032] To make the objectives, technical solutions, and advantages of the present invention more apparent, a detailed description is given below in conjunction with the accompanying drawings and specific embodiments. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0033] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] See also Figure 1 This embodiment discloses a molding machine, which mainly includes a frame 1, an upper frame assembly 2, a lower frame assembly 3, a middle frame 4, a main sand box 5 and a sand replenishing box. Figure 2The frame 1 is primarily composed of multiple aluminum alloy profiles assembled into a main skeleton, with panels mounted on the outside. The joints are bolted or welded together, and the frame 1 primarily serves as a load-bearing support. The frame 1 houses a gas tank 11 for storing high-pressure gas and an oil tank for supporting the drive mechanism. The frame 1 also features a control device for controlling the operating parameters of each component.

[0036] A main sand box 5 is provided on the top of one side of the frame 1, and a sand shooting mechanism is connected to the bottom of the main sand box 5. The main sand box 5 is used to store the main molding sand 8 required for molding. The sand shooting mechanism is used to drive the molding sand 8 in the main sand box 5 at high pressure and then shoot it into the sand box to complete the molding sand 8 filling process.

[0037] The frame 1 is provided with an upper frame assembly 2 and a lower frame assembly 3 arranged in a longitudinal alignment in the area below the main flask 5, with a middle frame 4 capable of horizontal movement disposed therebetween. The middle frame 4 is used to mount the mold 7. The mold 7 has a flange structure at the top and an upwardly concave inner contour at the bottom. The middle frame 4 is capable of linear horizontal reciprocating movement, mainly cooperating with the movement of the upper and lower frame assemblies 3 to complete the assembly and disassembly of the mold 7. The upper frame assembly 2 is provided with an upper sand frame 21 at the bottom, and the lower frame assembly 3 is provided with a lower sand frame 31 at the top. The upper and lower sand frames 21 and 31 have sand ejection ports 51 on their sides, respectively. The sand ejection ports 51 are connected to the main flask 5 via a sand ejection mechanism. The upper and lower sand frames 21 and 31 are both horizontal frames with upper and lower openings. The upper and lower sand frames 21 and 31 clamp the middle frame 4 to form a flask structure.

[0038] The upper sand frame 21 and the lower sand frame 31 need to be longitudinally spliced ​​twice within one molding cycle. The first splicing clamps the middle frame 4 in the middle, and the upper and lower frames are filled with sand and compacted. The upper and lower sand frames 31 are separated after compaction, the middle frame 4 is removed, and then the upper and lower sand frames 31 are spliced ​​again to splice the upper and lower parts of the molding sand 8 to complete the molding.

[0039] A longitudinally movable pressing plate is provided on the top of the upper sand frame 21, and the pressing plate includes a first pressing plate 22 and a second pressing plate 23 arranged inside and outside. The first pressing plate 22 and the second pressing plate 23 are arranged horizontally and are independently connected to a longitudinal driving device. The driving device adopts an oil cylinder. The first pressing plate 22 is aligned with the installation position of the mold 7, and the second pressing plate 23 is located outside the mold 7. Through partitioned compaction, the molding sand 8 in the area above the mold 7 and the area outside the mold 7 can be targetedly compacted, so that the compactness of each area is guaranteed, and the modeling can also be refined by secondary sand replenishment.

[0040] In another embodiment, Figure 9As shown, the top of the upper sand frame 21 is connected to a vertically arranged first oil cylinder 26, and the first oil cylinder 26 controls the raising and lowering of the upper sand frame 21 by extending and retracting its telescopic rod. The first pressing plate 22 and the second pressing plate 23 are both arranged horizontally, and the tops of the two are connected to a horizontal transition plate 28, and the top of the transition plate 28 is connected to a vertical second oil cylinder 27. The second oil cylinder 27 controls the raising and lowering of the transition plate 28 by extending and retracting its telescopic rod, thereby controlling the raising and lowering of the first pressing plate 22 and the second pressing plate 23, thereby causing the height of the bottom of the pressing plate to change in the upper sand frame 21, thereby achieving the effect of compacting the molding sand 8 in this area. During this process, the spring 251 is compressed to prevent the first pressure plate 22 from excessively squeezing the molding sand 8 below it until the second pressure plate 23 squeezes the molding sand 8 below it to a sufficient degree of compaction.

[0041] Furthermore, in this embodiment, the first and second pressing plates 22, 23 are connected by a closure member 24. The closure member 24 is specifically constructed in the form of a membrane-like flexible filter screen 64, the pores of which are smaller than the size of the molding sand 8. The closure member 24 primarily serves to connect and close the gap between the first and second pressing plates 22, 23, preventing the molding sand 8 at the bottom from overflowing upward from the gap when the first and second pressing plates 22, 23 are misaligned. The filter screen 64 ensures that a non-enclosed space is formed at the bottom, thereby preventing any additional burden on the movement of the first and second pressing plates 22, 23.

[0042] Combine Figures 2 to 5The lower frame assembly 3 mainly includes a first lifting plate 32 and a second lifting plate 33 arranged horizontally. The periphery of the two lifting plates can be slidably sleeved on a plurality of vertical guide rods 36. The bottom of the first lifting plate 32 is connected to a vertical third oil cylinder 321. The third oil cylinder 321 controls the lifting of the first lifting plate 32 by extending and retracting its telescopic rod. The bottom of the second lifting plate 33 is connected to a vertical fourth oil cylinder 331. The fourth oil cylinder 331 controls the lifting of the second lifting plate 33 by extending and retracting its telescopic rod. The lower sand frame 31 is fixed on the first lifting plate 32. A contact 34 is provided in the lower sand frame 31, and a fifth oil cylinder 35 is connected to the bottom of the contact 34. The fifth oil cylinder 35 is vertically installed on the second lifting plate 33. The fifth oil cylinder 35 controls the lifting and lowering of the contact 34 by extending and retracting its telescopic rod. The contact 34 can pass through the first lifting plate 32 and enter the lower frame. The contact 34 is located directly below the mold 7. After rising, the contact 34 can compact the molding sand 8 located in the inner cavity at the bottom of the mold 7. A sand replenishing channel is provided in the contact 34, and the sand replenishing pipe 346 is connected to the sand replenishing box provided on the frame 1.

[0043] Specifically, the contact 34 is a hollow columnar structure, and its outer contour is adapted to the inner cavity contour of the bottom of the mold 7. A partition layer 341 is provided inside the contact 34, and the partition layer 341 divides the internal cavity of the contact 34 into a sand cavity 342 and an air cavity 343 distributed inside and outside. A sand outlet hole 344 is provided on the top of the contact 34, and the sand cavity 342 is connected to the external space through the sand outlet hole 344.

[0044] Multiple air outlet holes 345 are evenly distributed on the sidewalls of the contact 34. The air cavity 343 communicates with the external space through the air outlet holes 345. It should be noted that the air outlet holes 345 are through-hole structures that are narrow inside and wide outside. This allows the high-pressure gas to diffuse outside the contact 34 after passing through the air outlet holes 345 from the air cavity 343. This helps to evenly spray the high-pressure gas and fully cover the internal cavity of the mold 7.

[0045] See also Figure 1 and Figure 6The sand replenishing box includes an air box 63 fixed on one side of the frame 1, and the air box 63 is provided with an air inlet 631 and an exhaust port 632 for connecting to the gas tank 11. The air inlet 631 and the exhaust port 632 are provided with solenoid valves for controlling the start and stop of the high-pressure gas. The top of the air box 63 is connected to the sand replenishing box of the injection hopper 6 through a pipeline; 61, the sand replenishing box of the injection hopper 6; 61 and the air box 63 are provided with a plug valve 62 on the pipeline. The bottom of the air box 63 is connected to the sand replenishing pipe 346 with a double-layer structure. The top of the sand replenishing pipe 346 is inserted into the air box 63 and is connected to the sand replenishing box of the injection hopper 6; 61. The other end of the sand replenishing pipe 346 is connected to the contactor 34, forming a double-channel structure distributed inside and outside. The main body of the sand-replenishing tube 346 is made of a rigid material, with the inner and outer layers connected by multiple evenly distributed support columns. The area near the bottom of the sand-replenishing tube 346, near the contact 34, is made of a flexible material, which facilitates the appropriate ductility for the raising and lowering of the contact 34. When the gate valve 62 is closed, the air box 63 at its bottom and the internal cavity of the sand-replenishing tube 346 form a relatively closed space.

[0046] The sand replenishing pipe 346 is located in the internal area of ​​the air box 63 as a breathable part, and the breathable part adopts a filter screen 64 as an isolation structure. The pores of the filter screen 64 are smaller than the size of the molding sand 8, forming an isolation structure for air passage and sand blocking. The molding sand 8 in the filling hopper 6 sand replenishing box; 61 can enter the sand cavity 342 inside the contact 34 through the inner cavity of the sand replenishing pipe 346, and pass through the sand outlet hole 344 to the outside of the contact 34 with the help of high-pressure gas; the high-pressure gas in the air box 63 can enter the air cavity 343 inside the contact 34 through the outer cavity of the sand replenishing pipe 346, and pass through the air outlet hole 345 to the outside of the contact 34. Part of the high-pressure gas in the air box 63 will pass through the filter screen 64 and enter the internal cavity of the sand replenishing pipe 346, serving as the feeding drive source for the molding sand 8 in the sand replenishing pipe 346.

[0047] Combine Figure 7 The sand filling process is explained. During the molding process, when the upper sand frame 21 and the lower sand frame 31 clamp and assemble the middle frame 4 and the mold 7 to form a sand box, the sand shooting port 51 can respectively add molding sand 8 to the upper and lower chambers of the sand box. The two parts of molding sand 8 are respectively used to shape the external and internal contours of the mold 7.

[0048] The sand injection and compaction process mainly consists of the following stages: Stage 1: the sand shooting port 51 injects sand into the upper and lower sand boxes at the same time; Stage 2: the upper sand box is pre-compacted to different degrees. Specifically, the first pressure plate 22 and the second pressure plate 23 are lowered to compact the molding sand 8 in the upper chamber. Since there is a mold 7 directly below the first pressure plate 22, in order to ensure that the molding sand 8 in the inner and outer areas has uniform compactness, the first pressure plate 22 and the second pressure plate 23 have different descending strokes to complete the preliminary shaping of the outer contour; Stage 3: the contact 34 rises for local pre-compression. Specifically, the contact 34 rises to compact the molding sand 8 in the area directly below the mold in the lower chamber. The outer contour of the contact 34 uniformly squeezes each area of ​​the inner contour of the mold 7 to complete the preliminary shaping of the inner contour; Stage 4: the upper sand box pressure plate is reset for secondary sand replenishment. Specifically, the first pressure plate 22 and the second pressure plate 23 rise and reset, and the sand shooting port 51 at the upper chamber is reset. The molding sand 8 is obtained from the main sand box 5 for replenishment. During this process, the contact 34 can be appropriately lowered. The contact 34 does not separate from the bottom cavity of the mold 7. The high-pressure gas in the air box 63 is opened at this time, driving the molding sand 8 in the sand replenishment pipe 346 to be squeezed out from the sand cavity 342 in the contact 34 through the sand outlet hole 344 and into the bottom inner cavity of the mold 7. At the same time, the high-pressure gas enters the air cavity 343 in the contact 34 from the outer cavity of the sand replenishment pipe 346, and is discharged through the air outlet hole 345 into the bottom inner cavity of the mold 7, blowing the replenished molding sand 8 evenly and dispersing it in various areas, and using its own pressure to pre-compact it; Stage 5: The upper and lower sand boxes are compacted as a whole. Specifically, the first pressure plate 22 and the second pressure plate 23 descend again to perform secondary compaction on the molding sand 8 in the upper chamber. During this process, the second lifting plate 33 rises synchronously to perform secondary compaction on the molding sand 8 in the lower chamber, completing the entire sand replenishment and compaction process.

[0049] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A molding machine, comprising a frame, on which a main sand box and a sand shooting mechanism are provided, characterized in that: The frame is provided with an upper frame assembly and a lower frame assembly which are longitudinally aligned, a middle frame which can move horizontally is provided between the two, the middle frame is used to install the mold, an upper sand frame is provided at the bottom of the upper frame assembly, and a lower sand frame is provided at the top of the lower frame assembly, the sides of the upper sand frame and the lower sand frame are respectively connected to the main sand box through a sand shooting mechanism, and the upper sand frame and the lower sand frame clamp the middle frame to form a sand box structure, a pressing plate is provided in the upper sand frame, and a contact is provided in the lower sand frame, a sand replenishing channel is provided in the contact, and the sand replenishing channel is connected to the sand replenishing box provided on the frame; The sand replenishing box includes an air box fixedly mounted on one side of the frame, an air inlet and an exhaust port for connecting to an air compressor are provided on the air box, a material injection hopper is connected to the top of the air box through a pipeline, an opening and closing mechanism is provided on the pipeline between the material injection hopper and the air box, a double-layer sand replenishing pipe is connected to the bottom of the air box, the top of the sand replenishing pipe is inserted into the air box and communicated with the pipeline at the bottom of the material injection hopper, and the other end of the sand replenishing pipe is communicated with a contact, forming a double-channel structure distributed inside and outside; The sand replenishing pipe is located in the inner area of ​​the air box and is a breathable part. The breathable part adopts a filter screen as an isolation structure. The pores of the filter screen are smaller than the size of the molding sand. The molding sand in the hopper can enter the sand cavity inside the contact through the inner cavity of the sand replenishing pipe, and pass through the sand outlet hole to the outside of the contact with the help of high-pressure gas; the high-pressure gas in the air box can enter the air cavity inside the contact through the outer cavity of the sand replenishing pipe, and pass through the air outlet hole to the outside of the contact. Part of the high-pressure gas in the air box will pass through the filter screen and enter the inner cavity of the sand replenishing pipe, serving as a feeding drive source for the molding sand in the sand replenishing pipe; The pressing plate includes a first pressing plate and a second pressing plate arranged inside and outside, the first pressing plate and the second pressing plate are arranged horizontally, and are independently connected to a longitudinal driving device.

2. A molding machine according to claim 1, characterized in that, The contact is a hollow columnar structure, and its outer contour is adapted to the inner contour of the mold. A partition is provided inside the contact, and the partition divides the internal cavity of the contact into a sand cavity and an air cavity distributed inside and outside respectively. Sand outlet holes and air outlet holes are provided on the contact. The sand cavity is connected to the external space through the sand outlet holes, and the air cavity is connected to the external space through the air outlet holes.

3. A molding machine according to claim 2, characterized in that: The plurality of air outlet holes are evenly distributed on the outer side wall of the contact.

4. A molding machine according to claim 2 or 3, characterized in that: The air outlet hole is a through hole structure that is narrow inside and wide outside.

5. A molding machine according to claim 1, characterized in that: The pressure plate includes a first pressure plate and a second pressure plate arranged inside and outside. The first pressure plate and the second pressure plate are arranged horizontally, and the tops of both are connected to the bottom of the horizontal transition plate. The top of the transition plate is connected to a longitudinal driving device; a longitudinal buffer structure is provided between the first pressure plate and the transition plate.

6. A molding machine according to claim 5, characterized in that: The buffer structure includes a support rod fixed on the top of the first pressure plate, the support rod is vertically arranged, and a spring is provided between the support rod and the transition plate.

7. A molding machine according to claim 5 or 6, characterized in that: A sealing member is provided between the first pressing plate and the second pressing plate.

8. A molding machine according to claim 7, characterized in that: The closure member adopts a membrane-like flexible filter screen structure, and the pores of the filter screen are smaller than the size of the molding sand.

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