Lost foam casting equipment and casting method for metal casting

Abstract

The invention relates to the technical field of cable processing, in particular to metal casting evanescent mode casting equipment and a casting method.The metal casting evanescent mode casting equipment comprises a casting bin, a casting platform is fixedly connected to the bottom of the inner wall of the casting bin, the casting bin comprises a casting bin shell, and tempered sealing glass is fixedly connected to the front side and the rear side of the casting bin shell; second tempered sealing glass is fixedly connected to the top of the right side of the casting bin shell, a sealing door is rotatably connected to the bottom of the right side of the casting bin shell, a vacuum pump connecting frame is fixedly connected to the rear side of the right side of the top of the casting bin shell, and vacuum pumps are fixedly connected to the two sides of the inner side of the vacuum pump connecting frame correspondingly. By arranging the casting bin, the casting process is efficient, environmentally friendly and safe, it is ensured that the interior of the casting bin rapidly reaches the required vacuum state through efficient operation of the vacuum pumps, and a powerful guarantee is provided for high-quality production of casting parts.

Description

Technical Field

[0001] The present invention relates to the technical field of cable processing, and more particularly to a metal casting lost foam casting device and a casting method. Background Art

[0002] Metal castings are produced by pouring molten metal into a prefabricated mold cavity and, after cooling and solidification, producing a metal part or blank with a defined shape, size, and properties. Metal castings are widely used in industrial production, such as automotive, machinery, and aerospace. Lost foam casting (LVC) technology allows for the efficient production of high-quality, high-precision metal castings that meet diverse complex shapes and performance requirements.

[0003] According to the patent document: CN112170782B, a lost foam casting method is disclosed, and the lost foam casting equipment suitable for this method includes a base plate, and first mounting plates are symmetrically fixedly connected to the left and right sides of the top of the base plate, and a molding sand collecting mechanism is commonly provided on the inner sides of the two first mounting plates; through the arrangement of the above structure, the casting can be conveniently taken out without tilting or flipping, which can ensure that the casting will not be damaged and the quality of the casting can be guaranteed. In the process of collecting the molding sand, the metal debris generated in the casting process can also be separated from the molding sand, and the molding sand will not be mixed with metal debris. The molding sand falling into the collection box can prevent the molding sand from being mixed with small particles, and the collected molding sand can be clean molding sand, which can be reused without consuming a lot of manpower and material resources for cleaning, which can greatly reduce the production cost and will not cause waste of molding sand.

[0004] When casting metal parts using lost foam casting, the traditional casting method does not use a vacuum environment when heating the casting liquid and pouring it into the sandbox for casting. As a result, impurities and oxygen in the air easily react with the casting liquid, affecting the quality of the casting. In addition, during the casting process, the casting liquid may oxidize when it comes into contact with oxygen in the air. This not only changes the chemical composition of the casting liquid, but also may form an oxide layer on its surface, affecting the surface quality and internal properties of the casting. In addition, dust and other small particles in the air may also mix into the casting liquid, becoming inclusions in the casting, reducing the strength and toughness of the casting. In order to overcome these shortcomings, Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a metal casting lost foam casting equipment and casting method. The technical problem to be solved by the present invention is that the traditional casting method is not in a vacuum state when heating the casting liquid and pouring it into a sandbox for casting. As a result, impurities and oxygen in the air easily react with the casting liquid, affecting the quality of the casting. In addition, during the casting process, the casting liquid may also cause oxidation when it comes into contact with oxygen in the air. This not only changes the chemical composition of the casting liquid, but also may form an oxide layer on its surface, thereby affecting the surface quality and internal performance of the casting. In addition, dust and other tiny particles in the air may also mix into the casting liquid, becoming inclusions in the casting, reducing the strength and toughness of the casting. In order to overcome these defects.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A lost foam casting device for metal castings comprises a casting chamber, wherein the bottom of the inner wall of the casting chamber is fixedly connected to a casting platform;

[0008] The casting chamber includes a casting chamber shell, and the front and rear sides of the casting chamber shell are fixedly connected to tempered sealing glass, the right top of the casting chamber shell is fixedly connected to a second tempered sealing glass, the right bottom of the casting chamber shell is rotatably connected to a sealing door, the rear side of the right side of the top of the casting chamber shell is fixedly connected to a vacuum pump connecting frame, the inner sides of the vacuum pump connecting frame are fixedly connected to vacuum pumps on both sides, and one end of the two vacuum pumps is fixedly connected to a vacuum pump pipeline;

[0009] The casting platform includes a casting platform body, the bottom of which is fixedly connected to the bottom of the inner wall of the casting chamber shell, a casting liquid heating tank connecting assembly is provided on the left side of the casting platform body, and a control assembly is provided at the bottom of the casting liquid heating tank connecting assembly.

[0010] As a further solution of the present invention: the two vacuum pump pipes are fixedly connected to a gas diversion bin at one end away from the vacuum pump, the top front side and the right bottom of the gas diversion bin are fixedly connected to the gas diversion bin exhaust pipe, the top of the casting bin shell is fixedly connected to a spray degradation tank on the side close to the gas diversion bin, the right side of the gas diversion bin exhaust pipe is fixedly connected to the spray degradation tank at one end away from the gas diversion bin, and the ends of the multiple gas diversion bin exhaust pipes on the top away from the gas diversion bin all extend to the inner wall of the casting bin shell, the top left side of the casting bin shell is fixedly connected to a casting liquid storage tank, the right bottom of the casting liquid storage tank is fixedly connected to a casting liquid outlet pipe, and the end of the casting liquid outlet pipe away from the casting liquid storage tank extends to the inner wall of the casting bin shell.

[0011] As a further solution of the present invention: the casting platform body includes a casting frame, a reinforcement component is provided on the right side of the inner side of the casting frame, and a sand box is provided on the inner side of the reinforcement component.

[0012] As a further solution of the present invention: the casting frame includes a base plate, the bottom of the base plate is fixedly connected to the bottom of the inner wall of the casting bin shell, a sand box placement slot is opened in the middle right side of the top of the base plate, the four sides of the top right side of the base plate are fixedly connected with support poles, the inner tops of the front and rear groups of support poles are fixedly connected with cross bars, the tops of the left and right groups of support poles are fixedly connected with a top plate, the inner sides of the two support poles on the left are fixedly connected with two columnar guide rods, the front and rear sides of the tops of the two top plates are fixedly connected with connecting poles, the inner sides of the two connecting poles on the right are fixedly connected with a connecting plate, and the inner sides of the two connecting poles on the left are fixedly connected with a heating seat connecting plate.

[0013] As a further solution of the present invention: the left inner wall of the base plate is fixedly connected to a heating seat, the bottom of the heating seat is fixedly connected to a heating controller, the bottom of the heating controller is fixedly connected to the top left side of the base plate, the front and rear sides of the left top side of the base plate are fixedly connected to third supporting columns, the tops of the two third supporting columns are fixedly connected to the bottom left side of the heating seat connecting plate, the front and rear sides of the top of the connecting plate are fixedly connected to a horizontal connecting rod, the bottom left sides of the two horizontal connecting rods are fixedly connected to the second supporting column, and the bottoms of the two second supporting columns are fixedly connected to the front and rear sides of the left top side of the heating seat connecting plate.

[0014] As a further solution of the present invention: the reinforcement component includes two splints, the left and right sides of the outer sides of the two splints are rotatably connected to V-shaped rotating rods, the middle parts of the outer walls of the front and rear groups of the V-shaped rotating rods are rotatably connected to hinge blocks, the outer sides of the front and rear groups of the hinge blocks are fixedly connected to the left and right sides of the inner sides of the two cross bars, the inner tops of the front and rear groups of the V-shaped rotating rods are rotatably connected to the expansion control plates, the two sides of the left inner walls of the two splints are rotatably connected to the front and rear sides of the outer walls of the two columnar guide rods, and the right sides of the inner sides of the two expansion control plates are The rotatable connection is provided with a rotating rod, and the left sides of the two rotating rods are rotatably connected to a push-pull block. The inner wall of the push-pull block is fixedly connected with a guide tube, and the bottom end of the guide tube extends to the bottom of the outer wall of the push-pull block. The top of the guide tube is a funnel-shaped design. The middle part of the outer side of the two expansion and retraction control plates is fixedly connected with an expansion and retraction control rod, and the top of the two expansion and retraction control rods is fixedly connected with an inverted L-shaped expansion and retraction control rod. The bottom of the sand box is slidably connected to the inner wall of the sand box placement slot opened on the right side of the top of the bottom plate, and the front and rear sides of the sand box are aligned with the inner sides of the two splints.

[0015] As a further solution of the present invention: the casting liquid heating tank connecting assembly includes a slide plate, the right side of the slide plate is fixedly connected to the middle part of the left top of the heating seat connecting plate, the top of the slide plate is slidably connected to the heating tank slide plate, the front and rear sides of the heating tank slide plate are slidably connected to two side vertical rods, the middle part of the inner wall of the heating tank slide plate is fixedly connected to the heating tank, the middle part of the right side of the top of the heating tank slide plate is fixedly connected to the liquid outlet nozzle connecting block, the inner wall of the liquid outlet nozzle connecting block is fixedly connected to the liquid outlet nozzle, the top of the liquid outlet nozzle is fixedly connected to the liquid passage, and one end of the liquid passage away from the liquid outlet nozzle is fixedly connected to the outer wall of the heating tank, and the inner tops of the front and rear two groups of side vertical rods are fixedly connected to the liquid outlet pipe positioning plate, the middle part of the liquid outlet pipe positioning plate is provided with a positioning groove, and the top of the slide plate is provided with a slide plate guide groove.

[0016] As a further solution of the present invention: the control component includes an L-shaped connecting plate, the right side of the L-shaped connecting plate is fixedly connected to the left side of the heating seat connecting plate, the front and rear sides of the top of the L-shaped connecting plate are fixedly connected to the bottoms of the front and rear two sets of side uprights, the front and rear sides of the bottom of the L-shaped connecting plate are fixedly connected to a support frame plate, the left sides of the two support frame plates are fixedly connected to the left side of the inner wall of the casting bin shell, the front and rear sides of the left side of the top of the L-shaped connecting plate are fixedly connected to the side connecting rods, the inner tops of the two side connecting rods are fixedly connected to the triangular top plate, and the right sides of the front and rear sides of the top of the triangular top plate are fixedly connected to the L-shaped expansion rod guide The top of the two L-shaped expansion rod guide rods is slidably connected to the L-shaped expansion rod, and the inner sides of the two L-shaped expansion rods are fixedly connected to the racks. The middle parts of the two L-shaped expansion rods are fitted and slidably connected, and the two racks fixed on the inner sides of the two L-shaped expansion rods are engaged with the outer walls of the two gears.

[0017] The left side of the inner side of the two L-shaped expansion rods is fixedly connected to the left side of the outer side of the top of the two inverted L-shaped expansion control rods.

[0018] In addition, the present invention also relates to a metal casting lost foam casting device and a casting method, comprising the following steps:

[0019] Step 1: Place the metal mold to be cast in the sandbox and ensure that the mold is tightly wrapped with an appropriate amount of molding sand to form a complete mold cavity. Then, close the door of the casting chamber shell to ensure the sealing of the casting process;

[0020] Step 2: Start the vacuum pump and extract the air in the casting chamber shell through the gas diversion chamber exhaust pipe to form a negative pressure environment to prepare for the subsequent casting process;

[0021] Step 3: The casting liquid is transported to the heating tank through the casting liquid storage tank and the casting liquid outlet pipe, and the heating controller is started to heat the heating seat to heat the casting liquid to a suitable casting temperature;

[0022] Step 4: The hydraulic push rod is activated, pushing the heating tank slide and the heating tank to the right to the top of the heating seat. At this time, the casting liquid in the heating tank begins to be heated;

[0023] Step 5: While the heating tank is heating the casting liquid, the movement of the heating tank slide drives the L-shaped expansion rod to slide on the top of the L-shaped expansion rod guide rod, and through the movement of the expansion control rod and the expansion control plate, the clamping plate moves inward and clamps the sandbox to stabilize the sandbox;

[0024] Step 6: When the casting liquid is heated to a suitable temperature, the liquid outlet nozzle transports the heated casting liquid into the guide pipe through the liquid pipe. The casting liquid flows into the mold cavity in the sand box along the funnel-shaped design part of the guide pipe, completing the casting process of the casting liquid;

[0025] Step 7: During the casting process, the vacuum pump runs continuously to maintain a negative pressure environment in the casting chamber shell, which helps the casting liquid to more fully fill the mold cavity and improve the accuracy and integrity of the casting;

[0026] Step 8: After casting is completed, turn off the vacuum pump, open the door of the casting chamber shell, take out the casting, and carry out subsequent cleaning and processing work.

[0027] The beneficial effects of the present invention are:

[0028] 1. The present invention is provided with a casting chamber, which makes the casting process efficient, environmentally friendly and safe. Among them, the efficient operation of the vacuum pump ensures that the interior of the casting chamber quickly reaches the required vacuum state, providing a strong guarantee for the high-quality production of castings. The reasonable design of the gas diversion chamber enables the gas to be evenly and efficiently diverted to the spray degradation tank, thereby improving the treatment efficiency of harmful gases. The spray device and degradation material inside the spray degradation tank can fully react with the harmful gases and convert them into harmless substances, greatly reducing pollution to the environment. Therefore, the metal casting lost foam casting equipment and casting method of the present invention not only improve the casting efficiency and product quality, but also achieve environmental protection and safety in the casting process, and have significant technical advantages and application value;

[0029] 2. The present invention ensures the stability and accuracy of the casting process by providing a casting bin and a casting platform, and also significantly improves the quality and production efficiency of castings. During the heating process of the casting liquid, the precise control of the heating controller enables the casting liquid to reach a suitable casting temperature evenly and quickly, thereby ensuring the performance of the casting. At the same time, the stable fixation of the sand box effectively prevents shaking or displacement during the casting process, further ensuring the accuracy of casting. In addition, the creation of a negative pressure environment reduces the pores and inclusions generated during the casting process, thereby improving the overall quality of the casting. The provision of a spray degradation treatment system effectively purifies the harmful gases generated during the casting process, thereby ensuring the safety and hygiene of the working environment. In summary, the present invention provides an efficient, stable, and environmentally friendly lost foam casting equipment and casting method for metal castings, which is of great significance for promoting the development of the casting industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the main three-dimensional structure of the present invention;

[0031] Figure 2 This is a schematic diagram of the main body three-dimensional separation structure of the present invention;

[0032] Figure 3 This is a schematic diagram of the three-dimensional structure of the casting bin of the present invention;

[0033] Figure 4 This is a schematic diagram of the three-dimensional structure of the casting platform of the present invention;

[0034] Figure 5 This is a schematic diagram of the three-dimensional separation structure of the casting platform of the present invention;

[0035] Figure 6 This is a schematic diagram of the three-dimensional structure of the casting platform main body of the present invention;

[0036] Figure 7 It is a schematic diagram of the three-dimensional structure of the casting frame of the present invention;

[0037] Figure 8 This is a schematic diagram of the three-dimensional separation structure of the reinforcement component and the sandbox of the present invention;

[0038] Figure 9 This is a schematic diagram of the three-dimensional structure of the casting liquid heating tank connection assembly of the present invention;

[0039] Figure 10 It is a schematic diagram of the three-dimensional structure of the control component of the present invention.

[0040] In the figure: 1. Casting chamber; 11. Casting chamber shell; 12. Tempered sealing glass; 13. Second tempered sealing glass; 14. Sealed door; 15. Vacuum pump connecting frame; 16. Vacuum pump pipeline; 17. Gas diversion chamber; 18. Gas diversion chamber exhaust pipe; 19. Vacuum pump; 110. Spray degradation tank; 111. Casting liquid storage tank; 112. Casting liquid outlet pipe; 2. Casting platform; 21. Casting platform body; 211. Casting frame; 2111. Bottom plate; 2112. Sandbox placement slot; 21 13. Supporting pole; 2114. Top plate; 2115. Connecting column; 2116. Connecting plate; 2117. Crossbar; 2118. Cross-connecting rod; 2119. Columnar guide rod; 21110. Heating controller; 21111. Heating base connecting plate; 21112. Heating base; 21113. Second supporting column; 21114. Third supporting column; 212. Reinforcement assembly; 2121. Clamping plate; 2122. V-shaped rotating rod; 2123. Articulated block; 2124. Retraction and expansion control panel; 2125, expansion and contraction control rod; 2126, rotation rod; 2127, inverted L-shaped expansion and contraction control rod; 2128, push-pull block; 2129, guide pipe; 213, sand box; 22, casting liquid heating tank connection assembly; 221, chute plate; 222, heating tank slide plate; 223, side pole; 224, liquid outlet pipe positioning plate; 225, positioning groove; 226, heating tank; 227, liquid outlet nozzle connection block; 228, liquid outlet nozzle; 229, liquid pipe; 2210, chute plate guide groove; 23, control Control components; 231, L-shaped connecting plate; 232, support frame plate; 233, side connecting rod; 234, triangular top plate; 235, L-shaped expansion rod guide rod; 236, L-shaped expansion rod; 237, rack; 238, two-way rack rod guide rod; 239, gear; 2310, two-way rack rod; 2311, vertical pole; 2312, sleeve push-pull rod; 2313, push-pull plate; 2314, sleeve; 2315, U-shaped push-pull rod; 2316, U-shaped push-pull rod push block; 2317, hydraulic push rod. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] like Figure 1-2 As shown, the present invention provides a lost foam casting device for metal castings, comprising a casting chamber 1, wherein the bottom of the inner wall of the casting chamber 1 is fixedly connected to a casting platform 2;

[0043] The casting platform 2 is provided to provide stable support for metal castings, ensuring stability and precision during the casting process. The design of the casting chamber 1 effectively accommodates various components required for the casting process, providing a closed and controllable casting environment.

[0044] like Figure 3 As shown, the casting chamber 1 includes a casting chamber shell 11, and the front and rear sides of the casting chamber shell 11 are fixedly connected with tempered sealing glass 12, the right top of the casting chamber shell 11 is fixedly connected with a second tempered sealing glass 13, and the right bottom of the casting chamber shell 11 is rotatably connected with a sealing door 14, and the rear side of the right top of the casting chamber shell 11 is fixedly connected with a vacuum pump connecting frame 15, and both sides of the inner side of the vacuum pump connecting frame 15 are fixedly connected with vacuum pumps 19, one end of the two vacuum pumps 19 is fixedly connected with a vacuum pump pipe 16, and the ends of the two vacuum pump pipes 16 away from the vacuum pump 19 are fixedly connected with a gas diversion chamber 17, and the top front side and the right bottom of the gas diversion chamber 17 are fixedly connected. A gas diversion bin exhaust pipe 18 is fixedly connected thereto, a spray degradation tank 110 is fixedly connected to one side of the top of the casting bin shell 11 near the gas diversion bin 17, an end of the right gas diversion bin exhaust pipe 18 away from the gas diversion bin 17 is fixedly connected to the spray degradation tank 110, and ends of multiple gas diversion bin exhaust pipes 18 at the top away from the gas diversion bin 17 all extend to the inner wall of the casting bin shell 11, a casting liquid storage tank 111 is fixedly connected to the left side of the top of the casting bin shell 11, a casting liquid outlet pipe 112 is fixedly connected to the right bottom of the casting liquid storage tank 111, and an end of the casting liquid outlet pipe 112 away from the casting liquid storage tank 111 extends to the inner wall of the casting bin shell 11;

[0045] By setting up the above structure, the working environment inside the casting chamber 1 is greatly optimized. The provision of the tempered sealing glass 12 and the second tempered sealing glass 13 allows the staff to clearly observe the working status inside the casting chamber 1. At the same time, the sealing of the casting chamber 1 is ensured, preventing the leakage of harmful gases generated during the casting process, thereby ensuring the safety of the staff.

[0046] The provision of the sealing door 14 facilitates the staff to open the sealing door 14 when needed. The vacuum pump 19 is connected to the gas diversion chamber 17 through the vacuum pump pipe 16. The air inside the inner wall of the casting chamber 1 can be extracted when casting and heating the casting liquid, and the air is discharged into the spray degradation tank 110 through the gas diversion chamber exhaust pipe 18 for degradation treatment, thereby effectively reducing the environmental pollution generated during the casting process.

[0047] The setting of the spray degradation tank 110 can spray and degrade harmful gases, further reduce the emission of harmful gases, and meet environmental protection requirements. At the same time, the casting liquid storage tank 111 sends the casting liquid into the casting bin 1 through the casting liquid outlet pipe 112, ensuring the smooth progress of the casting process. The structural design of the entire casting bin 1 is reasonable and easy to operate, which greatly improves the casting efficiency and product quality.

[0048] like Figure 4-10As shown, the casting platform 2 includes a casting platform body 21, the bottom of the casting platform body 21 is fixedly connected to the bottom of the inner wall of the casting bin shell 11, a casting liquid heating tank connection component 22 is provided on the left side of the casting platform body 21, and a control component 23 is provided at the bottom of the casting liquid heating tank connection component 22. The casting platform body 21 includes a casting frame 211, a reinforcement component 212 is provided on the right side of the inner side of the casting frame 211, and a sand box 213 is provided on the inner side of the reinforcement component 212. The casting frame 211 includes a bottom plate 2111, the bottom of the bottom plate 2111 is fixedly connected to the bottom of the inner wall of the casting bin shell 11, a sand box placement slot 2112 is provided in the middle of the top right side of the bottom plate 2111, and the four sides of the top right side of the bottom plate 2111 are fixedly connected to support The top of the two groups of support poles 2113 are fixedly connected with a cross bar 2117, the top of the two groups of support poles 2113 are fixedly connected with a top plate 2114, the inner sides of the two support poles 2113 on the left are fixedly connected with two columnar guide rods 2119, the front and rear sides of the tops of the two top plates 2114 are fixedly connected with connecting columns 2115, the inner sides of the two connecting columns 2115 on the right are fixedly connected with a connecting plate 2116, the inner sides of the two connecting columns 2115 on the left are fixedly connected with a heating seat connecting plate 21111, the left inner wall of the bottom plate 2111 is fixedly connected with a heating seat 21112, the bottom of the heating seat 21112 is fixedly connected with a heating controller 21110, and the heating controller 21 The bottom of 110 is fixedly connected to the top left side of the bottom plate 2111, and the front and rear sides of the top left side of the bottom plate 2111 are fixedly connected to the third support column 21114. The tops of the two third support columns 21114 are fixedly connected to the bottom left side of the heating seat connecting plate 21111. The front and rear sides of the top of the connecting plate 2116 are fixedly connected to the horizontal connecting rod 2118. The bottom left sides of the two horizontal connecting rods 2118 are fixedly connected to the second support column 21113. The bottoms of the two second support columns 21113 are fixedly connected to the front and rear sides of the top left side of the heating seat connecting plate 21111. The reinforcement component 212 includes two splints 2121. The left and right sides of the outer sides of the two splints 2121 are rotatably connected to the V-shaped rotating rod 2122 The middle parts of the outer walls of the front and rear two groups of V-shaped rotating rods 2122 are rotatably connected to hinge blocks 2123. The outer sides of the front and rear two groups of hinge blocks 2123 are fixedly connected to the left and right sides of the inner sides of the two cross bars 2117. The inner tops of the front and rear two groups of V-shaped rotating rods 2122 are rotatably connected to the expansion control plates 2124. The two sides of the left inner walls of the two splints 2121 are rotatably connected to the front and rear sides of the outer walls of the two columnar guide rods 2119. The right sides of the inner sides of the two expansion control plates 2124 are rotatably connected to rotating rods 2126. The left sides of the two rotating rods 2126 are rotatably connected to push-pull blocks 2128. The inner wall of the push-pull block 2128 is fixedly connected to a guide pipe 2129. The bottom end of the guide pipe 2129 extends to the bottom of the outer wall of the push-pull block 2128.The top of the guide tube 2129 is a funnel-shaped design. The middle part of the outer side of the two expansion control plates 2124 is fixedly connected with an expansion control rod 2125. The top of the two expansion control rods 2125 is fixedly connected with an inverted L-shaped expansion control rod 2127. The bottom of the sandbox 213 is slidably connected to the inner wall of the sandbox placement groove 2112 opened on the right side of the top of the bottom plate 2111. The front and rear sides of the sandbox 213 are aligned with the inner sides of the two splints 2121. The casting liquid heating tank connecting assembly 22 includes a slide plate 221. The right side of the slide plate 221 is fixedly connected to the middle part of the left side of the top of the heating seat connecting plate 21111. The top of the slide plate 221 is slidably connected to the heating tank slide plate 222. The front and rear sides of the heating tank slide plate 222 are slidably connected to two The side uprights 223 and the heating tank slide 222 are fixedly connected to the heating tank 226 in the middle of the inner wall, the middle of the right side of the top of the heating tank slide 222 is fixedly connected to the liquid nozzle connection block 227, the inner wall of the liquid nozzle connection block 227 is fixedly connected to the liquid nozzle 228, the top of the liquid nozzle 228 is fixedly connected to the liquid pipe 229, and the end of the liquid pipe 229 away from the liquid nozzle 228 is fixedly connected to the outer wall of the heating tank 226. The inner tops of the front and rear sets of side uprights 223 are fixedly connected to the liquid pipe positioning plate 224, the middle of the liquid pipe positioning plate 224 is provided with a positioning groove 225, the top of the slide plate 221 is provided with a slide plate guide groove 2210, and the control component 23 includes an L-shaped connecting plate 231, an L-shaped connecting plate 23 The right side of 1 is fixedly connected to the left side of the heating seat connecting plate 21111, the front and rear sides of the top of the L-shaped connecting plate 231 are fixedly connected to the bottom of the front and rear two sets of side vertical rods 223, the front and rear sides of the bottom of the L-shaped connecting plate 231 are fixedly connected to the support frame plate 232, the left side of the two support frame plates 232 are fixedly connected to the left side of the inner wall of the casting bin shell 11, the front and rear sides of the left side of the top of the L-shaped connecting plate 231 are fixedly connected to the side connecting rod 233, the inner top of the two side connecting rods 233 is fixedly connected to the triangular top plate 234, the right sides of the front and rear sides of the top of the triangular top plate 234 are fixedly connected to the L-shaped expansion rod guide rod 235, and the top of the triangular top plate 234 is rotated on both sides of the inner side of the two L-shaped expansion rod guide rods 235 The gear 239 is connected to the top of the triangular top plate 234. The middle part of the right side of the top is fixedly connected to a two-way rack rod guide rod 238. The inner walls of the two two-way rack rod guide rods 238 are slidably connected to the two rack rods 2310. The front and rear sides of the two-way rack rod 2310 are both engaged with the outer walls of the two gears 239. The tops of the two L-shaped expansion rod guide rods 235 are slidably connected to the L-shaped expansion rod 236. The inner sides of the two L-shaped expansion rods 236 are fixedly connected to the racks 237. The middle parts of the two L-shaped expansion rods 236 are fitted and slidably connected. The two racks 237 fixed on the inner sides of the two L-shaped expansion rods 236 are engaged with the outer walls of the two gears 239. The middle part of the left side of the top of the L-shaped connecting plate 231 is fixedly connected to a hydraulic push rod 2317.The right end of the hydraulic push rod 2317 is fixedly connected to a U-shaped push-pull rod push block 2316, the inner side of the right side of the U-shaped push-pull rod push block 2316 is fixedly connected to a U-shaped push-pull rod 2315, the right side of the U-shaped push-pull rod 2315 is fixedly connected to a push-pull plate 2313, the top of the push-pull plate 2313 is slidably connected to the bottom of the two-way rack rod guide rod 238, the right side of the push-pull plate 2313 is fixedly connected to the left side of the heating tank slide 222, and the bottom of the two-way rack rod guide rod 238 is fixedly connected There is a vertical rod 2311, the bottom of the vertical rod 2311 extends to the bottom of the outer wall of the two-way rack rod guide rod 238 and is fixedly connected to the right side with a collar push-pull rod 2312. The right end of the collar push-pull rod 2312 extends to the right side of the push-pull plate 2313 and is fixedly connected to a collar 2314. The inner wall of the collar 2314 is fixedly connected to the outer wall of the heating tank 226. The left sides of the inner sides of the two L-shaped expansion rods 236 are both fixedly connected to the left sides of the outer sides of the tops of the two inverted L-shaped expansion control rods 2127.

[0049] When the casting liquid needs to be heated, the casting liquid is sent to the inner wall of the heating tank 226 through the casting liquid storage tank 111 and the casting liquid outlet pipe 112. When a certain amount of casting liquid is stored in the inner wall of the heating tank 226, the casting liquid outlet pipe 112 stops delivering the casting liquid, and the hydraulic push rod 2317 is started to push the U-shaped push-pull rod push block 2316 to move to the right. The U-shaped push-pull rod push block 2316 moves to the right and drives the U-shaped push-pull rod 2315 and the push-pull plate 2313 and the sleeve The ring push-pull rod 2312 and the two-way rack rod 2310 move to the right together, and the heating tank slide 222 is moved to the right as a whole through the ring 2314 on the outer wall of the heating tank 226 and the push-pull plate 2313 fixed on the left side of the heating tank slide 222. At this time, the bottom of the heating tank 226 is on the top of the heating seat 21112, and the heating seat 21112 starts to heat the casting liquid in the heating tank 226. The heating controller 21110 accurately controls the heating process. When the hydraulic push rod 2317 pushes the heating tank slide 222, the heating tank 226 moves to the right to the top of the heating seat 21112 to heat the casting liquid on the inner wall of the heating tank 226. At the same time, when the heating tank slide 222 moves to the right, the vertical rod 2311 moves to the right, which drives the two-way rack rod 2310 to slide to the right on the inner wall of the two-way rack rod guide rod 238. When the two-way rack rod 2310 slides to the right, it drives the two gears 239 meshing with it to rotate. The rotation of the two gears 239 drives the two racks 237 meshing with them to move. The two racks 237 are respectively fixedly connected to the inner sides of the two L-shaped expansion rods 236. Therefore, as the gears 239 rotate, the L-shaped expansion rod 236 slides on the top of the L-shaped expansion rod guide rod 235, and the middle parts of the two L-shaped expansion rods 236 move closer to or away from each other, realizing the expansion and contraction action.

[0050] At the same time, since the left sides of the inner sides of the two L-shaped expansion rods 236 are fixedly connected to the left sides of the outer sides of the tops of the two inverted L-shaped expansion control rods 2127, the movement of the L-shaped expansion rod 236 will drive the movement of the inverted L-shaped expansion control rod 2127, and the movement of the inverted L-shaped expansion control rod 2127 will further drive the expansion control rod 2125 and the expansion control plate 2124 to move. The expansion control plate 2124 moves outward, and then the two sets of V-shaped rotating rods 2122 rotate to make the two clamping plates 2121 move inward to clamp the outer wall of the sand box 213, thereby fixing the sand box 213 and preventing the sand box 213 from shaking or shifting during the casting process, thereby ensuring the stability and accuracy of the casting process. At the same time, the expansion control plate 2124 moves outward and also drives the rotating rod 2126 and the push-pull block 2128 to move, so that the funnel-shaped design part of the guide pipe 2129 can be accurately aligned with the casting port of the sand box 213, so that the casting liquid can flow smoothly into the sand box 213 through the guide pipe 2129. 13, and at this time the top of the guide pipe 2129 is aligned with the bottom of the liquid outlet nozzle 228, the liquid outlet nozzle 228 can transport the heated casting liquid into the guide pipe 2129 through the liquid pipe 229, and then the casting liquid flows into the sand box 213 along the guide pipe 2129 to complete the casting process of the casting liquid. In this process, the funnel design of the guide pipe 2129 can ensure that the casting liquid can flow in smoothly. In the process of the heating tank 226 heating the casting liquid, the heating controller 21110 will adjust the heating power of the heating seat 21112 in real time according to the preset temperature parameters to ensure that the casting liquid It can reach the appropriate casting temperature evenly and quickly, and when the casting liquid is heated and the heated casting liquid is transported to the inner wall of the sand box 213 for casting, the two vacuum pumps 19 are always started, and the air in the casting chamber shell 11 is extracted through the gas diversion chamber exhaust pipe 18 to form a negative pressure environment, which helps to reduce the pores and inclusions generated during the casting process and improve the quality of the casting. At the same time, the negative pressure environment also helps the casting liquid to more fully fill the mold cavity in the sand box 213, further ensuring the accuracy and integrity of the casting. The gas diversion chamber exhaust pipe 18 also extracts the gas generated during casting through the spray The spray degradation tank 110 performs spray degradation treatment. A spray device and a degradation agent are provided inside the spray degradation tank 110. The degradation agent is evenly sprayed into the gas through the spray device. The degradation agent reacts chemically with harmful substances in the gas to convert them into harmless substances, thereby achieving the purpose of purifying the gas. The gas after the spray degradation treatment is discharged to the outside through the exhaust pipe to ensure the safety and hygiene of the working environment. In summary, through reasonable structural design, the precise heating of the casting liquid, the stable fixation of the sand box, the smooth casting of the casting liquid and the optimization of the casting environment are achieved, which greatly improves the quality of the castings and the production efficiency.

[0051] In addition, the present invention also relates to a metal casting lost foam casting device and a casting method, comprising the following steps:

[0052] Step 1: Place the metal mold to be cast in the sandbox 213 and ensure that the mold is tightly wrapped with an appropriate amount of molding sand to form a complete mold cavity. Then, close the door of the casting chamber shell 11 to ensure the sealing of the casting process;

[0053] Step 2: Start the vacuum pump 19 to extract the air in the casting chamber shell 11 through the gas diversion chamber exhaust pipe 18 to form a negative pressure environment in preparation for the subsequent casting process;

[0054] Step 3: The casting liquid is transported to the heating tank 226 through the casting liquid storage tank 111 and the casting liquid outlet pipe 112. The heating controller 21110 starts to heat the heating seat 21112 to heat the casting liquid to a suitable casting temperature.

[0055] Step 4: The hydraulic push rod 2317 is activated, pushing the heating tank slide 222 and the heating tank 226 to the right to the top of the heating seat 21112. At this time, the casting liquid in the heating tank 226 begins to be heated;

[0056] Step 5: While the heating tank 226 is heating the casting liquid, the movement of the heating tank slide 222 drives the L-shaped expansion rod 236 to slide on top of the L-shaped expansion rod guide rod 235. The expansion control rod 2125 and the expansion control plate 2124 move, causing the clamping plate 2121 to move inward and clamp the sandbox 213, thereby stably fixing the sandbox 213.

[0057] Step 6: After the casting liquid is heated to a suitable temperature, the liquid outlet nozzle 228 delivers the heated casting liquid to the guide pipe 2129 through the liquid pipe 229. The casting liquid flows along the funnel-shaped design portion of the guide pipe 2129 into the mold cavity in the sand box 213, completing the casting process of the casting liquid;

[0058] Step 7: During the casting process, the vacuum pump 19 is continuously operated to maintain a negative pressure environment in the casting chamber shell 11, which helps the casting liquid to more fully fill the mold cavity and improve the accuracy and integrity of the casting;

[0059] Step 8: After the casting is completed, the vacuum pump 19 is turned off, the door of the casting chamber shell 11 is opened, the casting is taken out, and subsequent cleaning and processing work is carried out.

[0060] The working principle of the present invention is as follows: when the casting liquid needs to be heated, the casting liquid is sent to the inner wall of the heating tank 226 through the casting liquid storage tank 111 and the casting liquid outlet pipe 112. When a certain amount of casting liquid is stored in the inner wall of the heating tank 226, the casting liquid outlet pipe 112 stops sending the casting liquid, and the hydraulic push rod 2317 is started to push the U-shaped push-pull rod push block 2316 to move to the right. The U-shaped push-pull rod push block 2316 moves to the right and then drives the U-shaped push-pull rod 2315, the push-pull plate 2313, the collar push-pull rod 2312, and the two-way rack rod 2310 to move to the right together. The heating tank slide 222 is moved to the right as a whole by means of the collar 2314 sleeved on the outer wall of the heating tank 226 and the push-pull plate 2313 fixed on the left side of the heating tank slide 222. At this time, the bottom of the heating tank 226 is on the top of the heating seat 21112, and the heating seat 21112 begins to heat the casting liquid in the heating tank 226. The heating controller 21110 accurately controls the heating process to ensure that the casting liquid reaches the appropriate casting temperature. When the hydraulic push rod 2317 pushes the heating tank slide 222 to drive the heating tank 226 to move to the right to the top of the heating seat 21112 While heating the casting liquid on the inner wall of the heating tank 226, when the heating tank slide plate 222 moves to the right, the vertical rod 2311 moves to the right, which will drive the two-way rack rod 2310 to slide to the right on the inner wall of the two-way rack rod guide rod 238. When the two-way rack rod 2310 slides to the right, it will drive the two gears 239 meshing with it to rotate. The rotation of the two gears 239 will drive the two racks 237 meshing with them to move. The two racks 237 are respectively fixedly connected to the inner sides of the two L-shaped expansion rods 236. Therefore, as the gears 239 rotate, the gears 239 rotate. When the lever 232 is rotated, the L-shaped expansion rod 236 will slide on the top of the L-shaped expansion rod guide rod 235, and the middle parts of the two L-shaped expansion rods 236 will move closer to or farther away from each other to realize the expansion and contraction action. At the same time, since the left sides of the inner sides of the two L-shaped expansion rods 236 are respectively fixedly connected to the left sides of the outer sides of the tops of the two inverted L-shaped expansion control rods 2127, the movement of the L-shaped expansion rod 236 will drive the movement of the inverted L-shaped expansion control rod 2127. The movement of the inverted L-shaped expansion control rod 2127 will further drive the expansion and contraction control rod 2125 and the expansion and contraction control plate 2124 to move.The expansion control plate 2124 moves outward, and then the two sets of V-shaped rotating rods 2122 rotate to make the two clamping plates 2121 move inward to clamp the outer wall of the sand box 213, thereby fixing the sand box 213 and preventing the sand box 213 from shaking or shifting during the casting process, thereby ensuring the stability and accuracy of the casting process. At the same time, the expansion control plate 2124 moves outward and also drives the rotating rod 2126 and the push-pull block 2128 to move, so that the funnel-shaped design part of the guide tube 2129 can be accurately aligned with the casting port of the sand box 213, which is convenient for The casting liquid flows smoothly into the sand box 213 through the guide pipe 2129, and at this time the top of the guide pipe 2129 is aligned with the bottom of the liquid outlet nozzle 228. The liquid outlet nozzle 228 can transport the heated casting liquid into the guide pipe 2129 through the liquid pipe 229, and then the casting liquid flows into the sand box 213 along the guide pipe 2129 to complete the casting process of the casting liquid. In this process, the funnel design of the guide pipe 2129 can ensure that the casting liquid can flow smoothly. When the heating tank 226 heats the casting liquid, the heating controller 2 1110 will adjust the heating power of the heating seat 21112 in real time according to the preset temperature parameters to ensure that the casting liquid can reach the appropriate casting temperature evenly and quickly. When the casting liquid is heated and the heated casting liquid is transported to the inner wall of the sand box 213 for casting, the two vacuum pumps 19 are always started, and the air in the casting chamber shell 11 is extracted through the gas diversion chamber exhaust pipe 18 to form a negative pressure environment, which helps to reduce the pores and inclusions generated during the casting process and improve the quality of the casting. At the same time, the negative pressure environment also helps the casting process. The liquid is made to more fully fill the mold cavity in the sand box 213, further ensuring the accuracy and integrity of the casting. The gas diversion bin exhaust pipe 18 also extracts the gas generated during casting and sprays it through the spray degradation tank 110 for degradation treatment. The spray degradation tank 110 is provided with a spray device and a degradation agent. The degradation agent is evenly sprayed into the gas through the spray device. The degradation agent reacts chemically with the harmful substances in the gas and converts them into harmless substances, thereby achieving the purpose of purifying the gas. The gas after spray degradation treatment is discharged to the outside through the exhaust pipe.

[0061] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A metal casting lost foam casting equipment, characterized by: It comprises a casting bin (1), wherein the bottom of the inner wall of the casting bin (1) is fixedly connected to a casting platform (2); The casting chamber (1) comprises a casting chamber shell (11), the front and rear sides of the casting chamber shell (11) are fixedly connected with tempered sealing glass (12), the right top of the casting chamber shell (11) is fixedly connected with a second tempered sealing glass (13), the right bottom of the casting chamber shell (11) is rotatably connected with a sealing door (14), the rear side of the right top of the casting chamber shell (11) is fixedly connected with a vacuum pump connecting frame (15), both sides of the inner side of the vacuum pump connecting frame (15) are fixedly connected with vacuum pumps (19), and one end of each of the two vacuum pumps (19) is fixedly connected with a vacuum pump pipeline (16); The casting platform (2) comprises a casting platform body (21), the bottom of which is fixedly connected to the bottom of the inner wall of the casting chamber shell (11), a casting liquid heating tank connection component (22) is provided on the left side of the casting platform body (21), and a control component (23) is provided at the bottom of the casting liquid heating tank connection component (22).

2. The lost foam casting equipment for metal castings according to claim 1, characterized in that: The ends of the two vacuum pump pipes (16) away from the vacuum pump (19) are fixedly connected to the gas diversion chamber (17), the top front side and the right bottom of the gas diversion chamber (17) are fixedly connected to the gas diversion chamber exhaust pipe (18), the top of the casting chamber shell (11) is fixedly connected to the side of the gas diversion chamber (17) close to the spray degradation tank (110), and the end of the gas diversion chamber exhaust pipe (18) on the right side away from the gas diversion chamber (17) is fixedly connected to the spray degradation tank (110). 10), one end of the multiple gas diversion chamber exhaust pipes (18) at the top away from the gas diversion chamber (17) all extends to the inner wall of the casting chamber shell (11), the left side of the top of the casting chamber shell (11) is fixedly connected to a casting liquid storage tank (111), the right bottom of the casting liquid storage tank (111) is fixedly connected to a casting liquid outlet pipe (112), and the end of the casting liquid outlet pipe (112) away from the casting liquid storage tank (111) extends to the inner wall of the casting chamber shell (11).

3. The lost foam casting equipment for metal castings according to claim 1, characterized in that: The casting platform body (21) comprises a casting frame (211), a reinforcement component (212) is provided on the right side of the inner side of the casting frame (211), and a sand box (213) is provided on the inner side of the reinforcement component (212).

4. The lost foam casting equipment for metal castings according to claim 3, characterized in that: The casting frame (211) includes a bottom plate (2111), the bottom of the bottom plate (2111) is fixedly connected to the bottom of the inner wall of the casting chamber shell (11), a sandbox placement slot (2112) is provided in the middle of the right side of the top of the bottom plate (2111), four sides of the right side of the top of the bottom plate (2111) are fixedly connected to support rods (2113), the inner tops of the front and rear groups of the support rods (2113) are fixedly connected to cross bars (2117), and the left and right groups of the support rods (2113) are fixedly connected to the inner tops of the two groups. 113) are fixedly connected to a top plate (2114), the inner sides of the two supporting uprights (2113) on the left are fixedly connected to two columnar guide rods (2119), the front and rear sides of the tops of the two top plates (2114) are fixedly connected to connecting uprights (2115), the inner sides of the two connecting uprights (2115) on the right are fixedly connected to a connecting plate (2116), and the inner sides of the two connecting uprights (2115) on the left are fixedly connected to a heating seat connecting plate (21111).

5. The lost foam casting equipment for metal castings according to claim 4, characterized in that: The left inner wall of the bottom plate (2111) is fixedly connected to a heating seat (21112), the bottom of the heating seat (21112) is fixedly connected to a heating controller (21110), the bottom of the heating controller (21110) is fixedly connected to the top left side of the bottom plate (2111), the front and rear sides of the top left side of the bottom plate (2111) are fixedly connected to third support columns (21114), the tops of the two third support columns (21114) are fixedly connected to the bottom left side of the heating seat connecting plate (21111), the front and rear sides of the top of the connecting plate (2116) are fixedly connected to a transverse connecting rod (2118), the bottom left sides of the two transverse connecting rods (2118) are fixedly connected to a second supporting column (21113), and the bottoms of the two second supporting columns (21113) are fixedly connected to the front and rear sides of the top left side of the heating seat connecting plate (21111).

6. The lost foam casting equipment for metal castings according to claim 3, characterized in that: The reinforcement assembly (212) includes two splints (2121), the left and right sides of the outer sides of the two splints (2121) are rotatably connected to V-shaped rotating rods (2122), the middle parts of the outer walls of the front and rear groups of the V-shaped rotating rods (2122) are rotatably connected to hinge blocks (2123), the outer sides of the front and rear groups of the hinge blocks (2123) are fixedly connected to the left and right sides of the inner sides of the two cross bars (2117), the inner tops of the front and rear groups of the V-shaped rotating rods (2122) are rotatably connected to the expansion control plate (2124), the left sides of the inner walls of the two splints (2121) are rotatably connected to the front and rear sides of the outer walls of the two columnar guide rods (2119), the right sides of the inner sides of the two expansion control plates (2124) are rotatably connected to the rotating rods (2126), and the two The left side of the rotating rod (2126) is rotatably connected to a push-pull block (2128), the inner wall of the push-pull block (2128) is fixedly connected to a guide tube (2129), the bottom end of the guide tube (2129) extends to the bottom of the outer wall of the push-pull block (2128), the top of the guide tube (2129) is funnel-shaped, the middle parts of the outer sides of the two expansion and retraction control plates (2124) are fixedly connected to expansion and retraction control rods (2125), the tops of the two expansion and retraction control rods (2125) are fixedly connected to an inverted L-shaped expansion and retraction control rod (2127), the bottom of the sandbox (213) is slidably connected to the inner wall of the sandbox placement slot (2112) opened on the right side of the top of the bottom plate (2111), and the front and rear sides of the sandbox (213) are aligned with the inner sides of the two splints (2121).

7. The lost foam casting equipment for metal castings according to claim 3, characterized in that: The casting liquid heating tank connection assembly (22) includes a chute plate (221), the right side of the chute plate (221) is fixedly connected to the middle of the left side of the top of the heating seat connection plate (21111), the top of the chute plate (221) is slidably connected to a heating tank slide plate (222), the front and rear sides of the heating tank slide plate (222) are both slidably connected to two side uprights (223), the middle of the inner wall of the heating tank slide plate (222) is fixedly connected to a heating tank (226), and the middle of the right side of the top of the heating tank slide plate (222) is fixedly connected to a liquid outlet nozzle connection block (227). The inner wall of the liquid outlet nozzle connection block (227) is fixedly connected to a liquid outlet nozzle (228), the top of the liquid outlet nozzle (228) is fixedly connected to a liquid passage (229), and one end of the liquid passage (229) away from the liquid outlet nozzle (228) is fixedly connected to the outer wall of the heating tank (226), and the inner tops of the front and rear groups of the side uprights (223) are fixedly connected to a liquid outlet pipe positioning plate (224), a positioning groove (225) is provided in the middle of the liquid outlet pipe positioning plate (224), and a slide plate guide groove (2210) is provided on the top of the slide plate (221).

8. The lost foam casting equipment for metal castings according to claim 1, characterized in that: The control assembly (23) includes an L-shaped connecting plate (231), the right side of the L-shaped connecting plate (231) is fixedly connected to the left side of the heating seat connecting plate (21111), the front and rear sides of the top of the L-shaped connecting plate (231) are fixedly connected to the bottoms of the front and rear two sets of side uprights (223), the front and rear sides of the bottom of the L-shaped connecting plate (231) are fixedly connected to a support frame plate (232), the left sides of the two support frame plates (232) are fixedly connected to the left side of the inner wall of the casting bin shell (11), the front and rear sides of the left side of the top of the L-shaped connecting plate (231) are fixedly connected to a side connecting rod (233), the inner tops of the two side connecting rods (233) are fixedly connected to a triangular top plate (234), the right sides of the front and rear sides of the top of the triangular top plate (234) are fixedly connected to an L-shaped expansion rod guide rod (235), and the triangular top plate The top of (234) is rotatably connected to gears (239) on both sides of the inner side of the two L-shaped expansion rod guide rods (235); the middle part of the top right side of the triangular top plate (234) is fixedly connected to a two-way rack rod guide rod (238); the inner walls of the two two-way rack rod guide rods (238) are slidably connected to a two-way rack rod (2310); the front and rear sides of the two-way rack rod (2310) are both engaged with the outer walls of the two gears (239); the tops of the two L-shaped expansion rod guide rods (235) are both slidably connected to the L-shaped expansion rod (236); the inner sides of the two L-shaped expansion rods (236) are both fixedly connected to a rack (237); the middle parts of the two L-shaped expansion rods (236) are attached and slidably connected, and the two racks (237) fixed on the inner sides of the two L-shaped expansion rods (236) are engaged with the outer walls of the two gears (239).

9. The lost foam casting equipment for metal castings according to claim 8, characterized in that: The middle part of the left top of the L-shaped connecting plate (231) is fixedly connected with a hydraulic push rod (2317), the right end of the hydraulic push rod (2317) is fixedly connected with a U-shaped push-pull rod push block (2316), the inner side of the right side of the U-shaped push-pull rod push block (2316) is fixedly connected with a U-shaped push-pull rod (2315), the right side of the U-shaped push-pull rod (2315) is fixedly connected with a push-pull plate (2313), the top of the push-pull plate (2313) is slidably connected to the bottom of the two-way rack rod guide rod (238), the right side of the push-pull plate (2313) is fixedly connected to the left side of the heating tank slide plate (222), and the The bottom of the two-way rack rod guide rod (238) is fixedly connected to a vertical rod (2311), the bottom of the vertical rod (2311) extends to the bottom of the outer wall of the two-way rack rod guide rod (238) and is fixedly connected to a sleeve push-pull rod (2312) on the right side, the right end of the sleeve push-pull rod (2312) extends to the right side of the push-pull plate (2313) and is fixedly connected to a sleeve (2314), the inner wall of the sleeve (2314) is fixedly connected to the outer wall of the heating tank (226), and the left sides of the inner sides of the two L-shaped expansion rods (236) are fixedly connected to the left sides of the outer sides of the tops of the two inverted L-shaped expansion control rods (2127).

10. The lost foam casting equipment and casting method for metal castings according to claim 7, characterized in that: Step 1: Place the metal mold to be cast in the sandbox (213) and ensure that the mold is tightly wrapped with an appropriate amount of molding sand to form a complete mold cavity. Then, close the door of the casting chamber shell (11) to ensure the sealing of the casting process; Step 2: Start the vacuum pump (19) to extract the air in the casting chamber shell (11) through the gas diversion chamber exhaust pipe (18) to form a negative pressure environment to prepare for the subsequent casting process; Step 3: The casting liquid is transported to the heating tank (226) through the casting liquid storage tank (111) and the casting liquid outlet pipe (112), and the heating controller (21110) starts to heat the heating seat (21112) to heat the casting liquid to a suitable casting temperature; Step 4: The hydraulic push rod (2317) is activated to push the heating tank slide (222) and the heating tank (226) to the right to the top of the heating seat (21112). At this time, the casting liquid in the heating tank (226) begins to be heated; Step 5: While the heating tank (226) is heating the casting liquid, the movement of the heating tank slide plate (222) drives the L-shaped expansion rod (236) to slide on the top of the L-shaped expansion rod guide rod (235), and through the movement of the expansion control rod (2125) and the expansion control plate (2124), the clamping plate (2121) moves inward and clamps the sandbox (213), thereby stably fixing the sandbox (213); Step 6: When the casting liquid is heated to a suitable temperature, the liquid outlet nozzle (228) transports the heated casting liquid to the guide pipe (2129) through the liquid pipe (229), and the casting liquid flows into the mold cavity in the sand box (213) along the funnel-shaped design part of the guide pipe (2129), completing the casting process of the casting liquid; Step 7: During the casting process of the casting liquid, the vacuum pump (19) is continuously operated to maintain a negative pressure environment in the casting chamber shell (11), which helps the casting liquid to more fully fill the mold cavity and improve the accuracy and integrity of the casting; Step 8: After the casting is completed, the vacuum pump (19) is turned off, the door of the casting chamber shell (11) is opened, the casting is taken out, and subsequent cleaning and processing work is carried out.

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