Production process and equipment of low nickel-chromium alloy cast iron butterfly valve

Abstract

The application discloses a low-nickel-chromium alloy cast iron butterfly valve production process and equipment, which comprises a cleaning box, the front face of the cleaning box is provided with a feeding opening, the inner wall of the feeding opening is provided with a cover plate through clamping, the two sides of the cleaning box are fixedly connected with supports, the top of the cleaning box is connected with a top cover, the bottom of the cleaning box is connected with a drain pipe, and the end, away from the cleaning box, of the drain pipe is connected with a water collecting tank; the back of the cleaning box is fixedly connected with a sealing frame, the inner cavity of the cleaning box is provided with a shaking assembly, the inner cavity of the sealing frame is provided with a pressure increasing assembly; and the inner cavity of the cleaning box is respectively provided with a cleaning assembly, a gas supply assembly and a water supply assembly. Through the low-nickel-chromium alloy cast iron butterfly valve production process and equipment, the impurities adhered to the surface of the low-nickel-chromium alloy cast iron butterfly valve embryo are fully cleaned in a mode of combination of shaking, cleaning, spraying and sprinkling, and the machining quality of the finished low-nickel-chromium alloy cast iron butterfly valve is improved.

Description

Technical Field

[0001] This invention relates to the field of butterfly valve manufacturing technology, specifically to a manufacturing process and equipment for a low-nickel-chromium alloy cast iron butterfly valve. Background Technology

[0002] A butterfly valve, also known as a flap valve, is a simple regulating valve used for the on / off control of low-pressure pipeline media. A butterfly valve is characterized by its closing element (valve disc or butterfly plate) being a disc that rotates around a valve shaft to open and close. These valves can control the flow of various types of fluids, including air, water, steam, various corrosive media, mud, oil, liquid metals, and radioactive media. They primarily function as shut-off and flow-blocking elements in pipelines. The butterfly valve's opening and closing element is a disc-shaped butterfly plate that rotates around its own axis within the valve body to achieve opening, closing, or regulation.

[0003] There are many types of butterfly valves. Depending on the application scenario, a low-nickel-chromium alloy cast iron butterfly valve has appeared on the market. However, in the current production process of low-nickel-chromium alloy cast iron butterfly valves, only a simple cleaning method is used to remove impurities attached to the surface of the valve blank. A combination of shaking, sweeping, spraying, and scrubbing is not used to fully clean the impurities attached to the surface of the valve blank. This leads to processing accidents during the rough and finish machining of the low-nickel-chromium alloy cast iron butterfly valve blank, reducing the processing quality of the finished product. Therefore, this paper proposes a production process and equipment for low-nickel-chromium alloy cast iron butterfly valves. Summary of the Invention

[0004] The purpose of this invention is to provide a production process and equipment for low-nickel-chromium alloy cast iron butterfly valves, in order to solve the problem mentioned in the background art that the current production process of low-nickel-chromium alloy cast iron butterfly valves on the market cannot use a combination of shaking, sweeping, spraying and rinsing to fully clean the impurities attached to the surface of the low-nickel-chromium alloy cast iron butterfly valve blank, thus reducing the processing quality of the finished low-nickel-chromium alloy cast iron butterfly valve.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a low-nickel chromium alloy cast iron butterfly valve production equipment, comprising a cleaning box, wherein a feeding port is provided on the front of the cleaning box and a cover plate is snapped onto the inner wall of the feeding port, brackets are fixedly connected to both sides of the cleaning box, a top cover is connected to the top of the cleaning box, a drain pipe is connected to the bottom of the cleaning box, and a water collection tank is connected to the end of the drain pipe away from the cleaning box.

[0006] A sealing frame is fixedly connected to the back of the cleaning box, a shaking component is provided in the inner cavity of the cleaning box, and a pressurizing component is provided in the inner cavity of the sealing frame.

[0007] The cleaning box is equipped with a cleaning assembly, an air supply assembly, and a water supply assembly.

[0008] Preferably, the shaking assembly includes T-shaped slide rails, with four sets of T-shaped slide rails arranged around the inner cavity of the cleaning box. A servo motor is fixedly connected to the side of the cleaning box near the cover plate, and the output shaft of the servo motor is fixedly connected to a concave rod frame. A rotating cylinder is rotatably connected to the center of the concave rod frame, and a connecting rod is fixedly connected to the outer wall of the rotating cylinder. A frame is hinged to the side of the connecting rod away from the rotating cylinder, and a grid is fixedly connected to the inner wall of the frame. T-shaped sliders that slide in cooperation with the T-shaped slide rails are fixedly connected around the frame.

[0009] Preferably, the booster assembly includes a cam, which is fixed on the side of the concave rod away from the servo motor. A slide block is slidably connected to the surface of the cam. A lifting rod and a piston that slide in cooperation with the sealing frame are respectively fixedly connected to the side of the slide block away from the cam. A return spring that is fixedly cooperates with the sealing frame and the piston is sleeved on the outer surface of the lifting rod.

[0010] Preferably, the cleaning assembly includes a main synchronous pulley, which is fixed on the side of the concave rod frame near the cam. The two sides of the main synchronous pulley away from the concave rod frame are connected to the secondary synchronous pulleys via V-belt drives. The inner cavities of the two sets of secondary synchronous pulleys are fixedly connected to cleaning rollers that cooperate with the grille, and cleaning brush bristles are fixedly connected around the cleaning rollers. The two sets of cleaning rollers are connected to a connector on the side away from the secondary synchronous pulleys.

[0011] Preferably, the air supply assembly includes air jet holes, two sets of air jet holes are opened around the cleaning roller near the cleaning brush bristles, the sealing frame is connected to an air supply pipe on the side near the piston and the other end of the air supply pipe is connected to a T-joint, both ends of the T-joint are connected to branch pipes and the other end of the branch pipes are connected to a rotary joint that rotates with the connector.

[0012] Preferably, the water supply assembly includes water pipes, two sets of water pipes are connected to the other two sides of the sealing frame near the piston, one end of the two sets of water pipes near the sealing frame is connected to a connecting head and the inner wall of the connecting head is threaded with a water tank, the end of the two sets of water tanks away from the connecting head is embedded with a liquid level sensor, the end of the two sets of water pipes away from the sealing frame is connected to a T-pipe, the outlet of the T-pipe is connected to a water distribution plate and the bottom of the water distribution plate is connected to spray nozzles that cooperate with the grille around the perimeter.

[0013] Preferably, slots are provided on both the upper and lower sides of the inner cavity of the water collection tank, and frames are engaged with the inner walls of the two sets of slots, with a pull-out bracket fixedly connected to the front of the frames.

[0014] Preferably, the inner cavities of the two sets of frames are respectively fixedly connected to a primary filter and a secondary filter, wherein the mesh shapes of the primary filter and the secondary filter are rhomboid and round holes, respectively.

[0015] A manufacturing process for a low-nickel-chromium alloy cast iron butterfly valve production equipment includes the following raw material components:

[0016] Carbon ≤3%, silicon 1.5-3%, manganese 0.7-1.2%, chromium 0.3-0.8%, nickel 1-5%, and phosphorus ≤0.08%;

[0017] The production steps are as follows:

[0018] Step 1, Shaping and Core Making: First, heat carbon, silicon, manganese, chromium, nickel and phosphorus in the following proportions: ≤3%, 1.5-3%, 0.7-1.2%, 0.3-0.8%, 1-5% and ≤0.08%, to 1000-1500℃ and to a liquid state.

[0019] Step 2, Smelting and Spheroidizing Treatment: The obtained molten metal is then smelted in a furnace at a temperature between 800-1200℃ to remove impurities. Then, the molten metal is spheroidized using one of the following methods: immersion method, bell jar method, or wire feeding method.

[0020] Step 3, Inoculation: Next, the spheroidized liquid metal is inoculated. During this process, additives are added to the liquid metal to promote nucleation and grain detachment inside the liquid metal and inhibit internal crystal growth until the liquid metal is inoculated to the point of refining the grain morphology.

[0021] Step 4, Pre-furnace Inspection: Before the inoculation treatment of the molten metal, the form, color, composition, etc. of the obtained molten metal are tested. After the test is completed, the inoculated molten metal is re-furnace purified to obtain the casting liquid.

[0022] Step 5, Pouring: Pour the casting liquid obtained in Step 4 into the molding sand mold through the pre-prepared molding sand gate. After the casting liquid cools and solidifies in the molding sand mold, remove it to obtain the low nickel chromium alloy cast iron butterfly valve blank.

[0023] Step 6, Post-furnace Inspection: The low-nickel chromium alloy cast iron butterfly valve blanks taken out of the heating furnace are then subjected to tensile strength, yield strength and elongation tests. The low-nickel chromium alloy cast iron butterfly valve blanks with tensile strength ≥450MPa, yield strength ≥310MPa and elongation ≥10% are qualified products.

[0024] Step 7, Cleaning: Next, the qualified low-nickel chromium alloy cast iron butterfly valve blanks are cleaned. First, open the cover plate, and then place the qualified low-nickel chromium alloy cast iron butterfly valve blanks through the feeding port onto the grid surface of the skeleton inside the cleaning box. Then, control the servo motor to start and drive the concave rod frame to rotate. The concave rod frame drives the connecting rod to rotate back and forth through the rotating cylinder. Four sets of T-shaped sliders and T-shaped slide rails provide sliding support compensation for the skeleton. The connecting rod drives the skeleton and grid to perform synchronous reciprocating lifting and lowering movements. The synchronous reciprocating lifting and lowering movements of the skeleton and grid cause the low-nickel chromium alloy cast iron butterfly valve blanks to shake up and down, forcing the adhering impurities on the low-nickel chromium alloy cast iron butterfly valve blanks to fall off. The adhering impurities fall off through the grid to the bottom of the cleaning box.

[0025] At the same time, the concave rod frame drives the cam to rotate synchronously. The cam drives the piston on the lifting rod to reciprocate in the bottom area of ​​the sealing frame through the slide block. The return spring provides compression and support compensation for the lifting rod. The reciprocating piston generates high-pressure gas in the bottom area of ​​the sealing frame. The concave rod frame drives the main synchronous wheel to rotate synchronously with the cam. The main synchronous wheel drives two sets of cleaning rollers on the synchronous wheel to rotate synchronously through the V-belt. The two sets of cleaning rollers use two sets of cleaning brushes to rotate and clean the low-nickel chromium alloy cast iron butterfly valve blank on the grid, so that the residual impurities adhering to the surface of the low-nickel chromium alloy cast iron butterfly valve blank are cleaned and removed.

[0026] Next, high-pressure gas from the bottom area of ​​the sealing frame is supplied through the gas delivery pipe and a three-way connector into two sets of branch pipes. Two sets of rotary joints and connectors then deliver the high-pressure gas to the two sets of cleaning rollers. The high-pressure gas from the bottom area of ​​the sealing frame reaches the two sets of rotating cleaning rollers and is then sprayed onto the surface of the low-nickel-chromium alloy cast iron butterfly valve blank on the grid through two sets of jet nozzles. Simultaneously, based on the siphon principle, water from the two sets of buckets located at higher positions flows into the two water delivery pipes through two sets of connectors. The high-pressure gas from the bottom area of ​​the sealing frame is supplied into the two water delivery pipes, creating a pressurization zone inside. Under high pressure, the water in the two water delivery pipes is forced through the three-way pipe into the water distribution plate, and then evenly sprayed onto the low-nickel-chromium alloy cast iron butterfly valve blank on the grid through the spray nozzles. The surface of the low-nickel chromium alloy cast iron butterfly valve blank is equipped with two sets of liquid level sensors to detect the water level in two sets of water tanks in real time. Under the rotating spray of two sets of jet holes and the uniform spray of the spray nozzles, the stubborn impurities adhering to the surface of the low-nickel chromium alloy cast iron butterfly valve blank are cleaned and removed. The impurities that fall to the bottom of the cleaning box are carried by the wastewater through the drain pipe to the water collection tank. The wastewater containing impurities is then filtered twice by the primary and secondary filters on the two sets of frames. The impurities remain on the primary and secondary filters. The clear wastewater after double filtration collects at the bottom of the water collection tank. After the primary and secondary filters have reached the predetermined cycle, the two sets of frames can be pulled out from the two sets of slots to clean the remaining impurities on the primary and secondary filters.

[0027] Step 8, Rough and Fine Machining: After cleaning, the low-nickel-chromium alloy cast iron butterfly valve blank is then subjected to rough machining operations such as grinding and drilling. After the rough machining is completed, the low-nickel-chromium alloy cast iron butterfly valve blank is placed in a precision machining tool for fine cutting to obtain the finished low-nickel-chromium alloy cast iron butterfly valve.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] 1. In this invention, when cleaning the low-nickel-chromium alloy cast iron butterfly valve blank, the servo motor of the shaking component first provides the driving source, and drives the concave rod frame, rotating drum and connecting rod to perform reciprocating lifting and lowering motion. Four sets of T-shaped slide rails and T-shaped sliders provide sliding support compensation for the skeleton, forcing the low-nickel-chromium alloy cast iron butterfly valve blank on the skeleton and grid to shake up and down, so that the impurities adhering to the surface of the low-nickel-chromium alloy cast iron butterfly valve blank fall off.

[0030] 2. In this invention, the cam, slide, lifting rod, piston and return spring of the pressurization component reciprocate to form pressurized gas in the bottom area of ​​the sealing frame, providing a pressurized gas source for subsequent jet cleaning and spray cleaning. At the same time, the main synchronous pulley of the cleaning component drives two sets of cleaning rollers on the synchronous pulley to rotate through the V-belt. The two sets of cleaning rollers clean the residual impurities adhering to the surface of the low nickel chromium alloy cast iron butterfly valve blank through the cleaning brush bristles.

[0031] 3. In this invention, under the supply of pressurized gas in the bottom area of ​​the sealing frame, the gas is delivered to the two sets of cleaning rollers via the gas supply component's gas pipe, tee connector, and branch pipe. Two sets of connectors and rotary joints then provide high-pressure gas delivery to the two sets of rotating cleaning rollers. The pressurized gas in the bottom area of ​​the sealing frame is then pressurized and injected through the jet holes of the two sets of cleaning rollers onto the surface of the low-nickel-chromium alloy cast iron butterfly valve blank. Simultaneously, two sets of water tanks and connecting heads supply water to the two water pipes. Two sets of level sensors monitor the water level in the two sets of water tanks. Real-time monitoring shows that pressurized gas in the bottom area of ​​the sealing frame reaches the water distribution plate through the two water supply pipes and the three-way pipe of the water supply component, and is then evenly sprayed onto the surface of the low-nickel-chromium alloy cast iron butterfly valve blank by the spray nozzle. Under the dual action of air jet and water spray, stubborn impurities adhering to the surface of the low-nickel-chromium alloy cast iron butterfly valve blank are removed, improving the cleanliness of the low-nickel-chromium alloy cast iron butterfly valve blank. This prevents residual impurities from affecting subsequent rough and fine machining, and improves the processing quality of the finished low-nickel-chromium alloy cast iron butterfly valve. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of the present invention;

[0033] Figure 2 This is a rear view of the structure of the present invention;

[0034] Figure 3 This is a partial cross-sectional view of the structure of the present invention;

[0035] Figure 4 This is an internal structural view of the present invention;

[0036] Figure 5 A bottom view of the structure of the shaking assembly, pressurizing assembly, cleaning assembly and air supply assembly of the present invention;

[0037] Figure 6 This is a schematic diagram of the swaying component and the pressurizing component of the present invention;

[0038] Figure 7 This is a side view of the structure of the shaking assembly and cleaning assembly of the present invention;

[0039] Figure 8 This is a side view of the cleaning assembly and air supply assembly structure of the present invention;

[0040] Figure 9 This is a partial cross-sectional view of the cleaning component structure of the present invention;

[0041] Figure 10 This is a bottom view of the water supply component structure of the present invention;

[0042] Figure 11 For the present invention Figure 3 Enlarged view of a portion of the structure at point A.

[0043] In the diagram: 1. Cleaning box; 2. Bracket; 3. Top cover; 4. Drain pipe; 5. Water collection tank; 6. Sealing frame; 7. Shaking assembly; 71. T-shaped slide rail; 72. Servo motor; 73. Concave rod frame; 74. Rotary drum; 75. Connecting rod; 76. Frame; 77. Grille; 78. T-shaped slider; 8. Pressurization assembly; 81. Cam; 82. Slide seat; 83. Lifting rod; 84. Piston; 85. Return spring; 9. Cleaning assembly; 91. Main synchronous pulley; 92. Slave synchronous pulley; 93. Sweeping roller; 94. Sweeping brush bristles; 95. Connector; 10. Air supply assembly; 101. Air jet nozzle; 102. Air supply pipe; 103. T-joint; 104. Branch pipe; 105. Rotary joint; 11. Water supply assembly; 111. Water supply pipe; 112. Connecting head; 113. Water tank; 114. Liquid level sensor; 115. T-joint; 116. Water distribution tray; 117. Spray nozzle; 12. Slot; 13. Frame; 14. Primary filter screen; 15. Secondary filter screen. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] Example 1

[0046] Please see Figures 1-11 The present invention provides a technical solution: a low nickel chromium alloy cast iron butterfly valve production equipment, including a cleaning box 1, a feeding port is opened on the front of the cleaning box 1 and a cover plate is snapped into the inner wall of the feeding port, a bracket 2 is fixedly connected to both sides of the cleaning box 1, a top cover 3 is connected to the top of the cleaning box 1, a drain pipe 4 is connected to the bottom of the cleaning box 1, and a water collection tank 5 is connected to the end of the drain pipe 4 away from the cleaning box 1.

[0047] A sealing frame 6 is fixedly connected to the back of the cleaning box 1. A shaking component 7 is provided in the inner cavity of the cleaning box 1. When cleaning the low nickel-chromium alloy cast iron butterfly valve blank, the servo motor 72 of the shaking component 7 provides the driving source and drives the concave rod frame 73, the rotating drum 74 and the connecting rod 75 to perform reciprocating lifting and lowering movements. The skeleton 76 is slidably supported by four sets of T-shaped slide rails 71 and T-shaped sliders 78, which forces the low nickel-chromium alloy cast iron butterfly valve blank on the skeleton 76 and the grid 77 to shake up and down, so that the impurities adhering to the surface of the low nickel-chromium alloy cast iron butterfly valve blank fall off. A pressurizing component 8 is provided in the inner cavity of the sealing frame 6.

[0048] The inner cavity of the cleaning box 1 is equipped with a cleaning assembly 9, an air supply assembly 10, and a water supply assembly 11. The pressurization assembly 8, consisting of a cam 81, a slide 82, a lifting rod 83, a piston 84, and a return spring 85, reciprocates to generate pressurized gas in the bottom area of ​​the sealing frame 6, providing a pressurized gas source for subsequent jet cleaning and spray cleaning. Simultaneously, the main synchronous pulley 91 of the cleaning assembly 9 drives two sets of cleaning rollers 93 mounted on synchronous pulleys 92 via a V-belt. The two sets of cleaning rollers 93 use cleaning brushes 94 to clean residual impurities adhering to the surface of the low-nickel-chromium alloy cast iron butterfly valve blank. With the pressurized gas supplied in the bottom area of ​​the sealing frame 6, the gas is delivered to the two sets of cleaning rollers 93 through the air supply assembly 10's air pipe 102, three-way connector 103, and branch pipe 104. Two sets of connectors 95 and rotary joints 105 provide high-pressure gas delivery to the rotating cleaning rollers 93. The pressurized gas in the bottom area of ​​the sealing frame 6 is injected through the jet holes 101 of the two sets of cleaning rollers 93 onto the surface of the low-nickel-chromium alloy cast iron butterfly valve blank. At the same time, water is supplied to the two water pipes 111 by the two sets of water tanks 113 and the connecting head 112. The two sets of liquid level sensors 114 detect the water level in the two sets of water tanks 113 in real time. The pressurized gas in the bottom area of ​​the sealing frame 6 reaches the water distribution plate 116 through the two water pipes 111 and the three-way pipe 115 of the water supply component 11, and is then evenly sprayed onto the surface of the low-nickel-chromium alloy cast iron butterfly valve blank by the spray nozzles 117. Under the dual action of air jet and water spray, the stubborn impurities adhering to the surface of the low-nickel-chromium alloy cast iron butterfly valve blank are removed, improving the cleanliness of the low-nickel-chromium alloy cast iron butterfly valve blank, preventing residual impurities from affecting subsequent rough and fine machining, and improving the processing quality of the finished low-nickel-chromium alloy cast iron butterfly valve.

[0049] Example 2

[0050] Please see Figures 1-11 This invention provides a technical solution: a low-nickel chromium alloy cast iron butterfly valve production equipment, including a cleaning box 1. The front of the cleaning box 1 has a feeding port and a cover plate is snapped onto the inner wall of the feeding port. The two sides of the cleaning box 1 are fixedly connected to the brackets 2. The top of the cleaning box 1 is connected to the top cover 3. The bottom of the cleaning box 1 is connected to the bottom drain pipe 4. The end of the drain pipe 4 away from the cleaning box 1 is connected to the water collection tank 5. The upper and lower sides of the inner cavity of the water collection tank 5 are provided with slots 12. The inner walls of the two sets of slots 12 are snapped with frames 13 and the front of the frames 13 is fixedly connected to a pull-out bracket. The inner cavities of the two sets of frames 13 are respectively fixedly connected to a primary filter screen 14 and a secondary filter screen 15. The mesh shapes of the primary filter screen 14 and the secondary filter screen 15 are rhomboid and round, respectively, which facilitates the installation and removal of the primary filter screen 14 and the secondary filter screen 15, and also filters impurities in the wastewater, which is conducive to the normal discharge of wastewater and subsequent recycling.

[0051] A sealing frame 6 is fixedly connected to the back of the cleaning box 1. A shaking assembly 7 is installed inside the cleaning box 1. The shaking assembly 7 includes T-shaped slide rails 71, with four sets of T-shaped slide rails 71 arranged around the perimeter of the cleaning box 1's interior. A servo motor 72 is fixedly connected to the side of the cleaning box 1 closest to the cover plate, and a concave rod frame 73 is fixedly connected to the output shaft of the servo motor 72. A rotating cylinder 74 is rotatably connected to the center of the concave rod frame 73, and a connecting rod 75 is fixedly connected to the outer wall of the rotating cylinder 74. A frame 76 is hinged to the side of the connecting rod 75 away from the rotating cylinder 74, and a grid 77 is fixedly connected to the inner wall of the frame 76. T-shaped sliders 78, which slide in cooperation with the T-shaped slide rails 71, are fixedly connected around the frame 76. When cleaning the low-nickel-chromium alloy cast iron butterfly valve blank, the servo motor 72 of the shaking assembly 7 provides the initial drive. The source drives the concave rod frame 73, the rotating drum 74 and the connecting rod 75 to reciprocate lifting and lowering motion. The frame 76 is slidably supported by four sets of T-shaped slide rails 71 and T-shaped sliders 78, which forces the low-nickel chromium alloy cast iron butterfly valve blanks on the frame 76 and the grid 77 to shake up and down, causing the impurities adhering to the surface of the low-nickel chromium alloy cast iron butterfly valve blanks to fall off. The inner cavity of the sealing frame 6 is provided with a pressure boosting component 8, which includes a cam 81. The cam 81 is fixed on the side of the concave rod frame 73 away from the servo motor 72. The surface of the cam 81 is slidably connected to a slide seat 82. The side of the slide seat 82 away from the cam 81 is respectively fixedly connected to a lifting rod 83 and a piston 84 that slide in cooperation with the sealing frame 6. The outer surface of the lifting rod 83 is sleeved with a return spring 85 that is fixedly cooperated with the sealing frame 6 and the piston 84.

[0052] The cleaning box 1 has a cleaning assembly 9, an air supply assembly 10, and a water supply assembly 11 installed inside. The cleaning assembly 9 includes a main synchronous pulley 91, which is fixed to the side of the concave rod 73 near the cam 81. The two sides of the main synchronous pulley 91 away from the concave rod 73 are connected to the driven synchronous pulleys 92 via V-belts. The inner cavities of the two sets of driven synchronous pulleys 92 are fixedly connected to cleaning rollers 93 that cooperate with the grille 77, and cleaning brush bristles 94 are fixedly connected around the cleaning rollers 93. The two sets of cleaning rollers 93 are connected to the side away from the driven synchronous pulleys 92 by a connector 95. The air supply assembly 10 includes air jet holes 101, which are opened around the cleaning rollers 93 near the cleaning brush bristles 94. The side of the sealing frame 6 near the piston 84 is connected to an air supply line. The other end of the pipe 102 and the gas pipe 102 are connected to a three-way connector 103. Both ends of the three-way connector 103 are connected to branch pipes 104, and the other end of the branch pipes 104 are connected to a rotary connector 105 that rotatably engages with the connector 95. The water supply assembly 11 includes a water supply pipe 111. Two sets of water supply pipes 111 are connected to the other two sides of the sealing frame 6 near the piston 84. One end of the two sets of water supply pipes 111 near the sealing frame 6 is connected to a connector 112, and the inner wall of the connector 112 is threaded with a water tank 113. The end of the two sets of water tanks 113 away from the connector 112 is embedded with a liquid level sensor 114. The end of the two sets of water supply pipes 111 away from the sealing frame 6 is connected to a three-way pipe 115. The outlet of the three-way pipe 115 is connected to a water distribution plate 116, and the water distribution plate 115 is connected to a water distribution plate 116. The bottom of the 16 is connected to water spray nozzles 117 that work with the grille 77. The pressurization assembly 8, consisting of cam 81, slide 82, lifting rod 83, piston 84, and return spring 85, reciprocates to create pressurized gas in the bottom area of ​​the sealing frame 6, providing a pressurized gas source for subsequent spray cleaning and scrubbing. At the same time, the main synchronous pulley 91 of the cleaning assembly 9 drives two sets of cleaning rollers 93 on the synchronous pulley 92 to rotate via a V-belt. The two sets of cleaning rollers 93 use cleaning brushes 94 to clean residual impurities adhering to the surface of the low-nickel chromium alloy cast iron butterfly valve blank. With the pressurized gas supply in the bottom area of ​​the sealing frame 6, the gas is delivered to the two sets of cleaning rollers through the air supply assembly 10's air pipe 102, three-way connector 103, and branch pipe 104. Within the 93, two sets of connectors 95 and rotary joints 105 provide high-pressure gas delivery to the two sets of rotating cleaning rollers 93. The pressurized gas in the bottom area of ​​the sealing frame 6 is then injected through the jet holes 101 of the two sets of cleaning rollers 93 onto the surface of the low-nickel-chromium alloy cast iron butterfly valve blank. Simultaneously, two sets of water tanks 113 and connecting heads 112 supply water to the two water pipes 111. Two sets of level sensors 114 monitor the water level in the two sets of water tanks 113 in real time. The pressurized gas in the bottom area of ​​the sealing frame 6 then reaches the water distribution plate 116 through the two water pipes 111 and the three-way pipe 115 of the water supply assembly 11, and is then evenly sprayed onto the surface of the low-nickel-chromium alloy cast iron butterfly valve blank by the spray nozzles 117. Under the dual action of airflow injection and water spraying,This process removes stubborn impurities adhering to the surface of the low-nickel-chromium alloy cast iron butterfly valve blank, improving the cleanliness of the blank and preventing residual impurities from affecting subsequent rough and finish machining, thus improving the overall processing quality of the finished low-nickel-chromium alloy cast iron butterfly valve.

[0053] A manufacturing process for a low-nickel-chromium alloy cast iron butterfly valve production equipment includes the following raw material components:

[0054] Carbon ≤3%, silicon 1.5-3%, manganese 0.7-1.2%, chromium 0.3-0.8%, nickel 1-5%, and phosphorus ≤0.08%;

[0055] The production steps are as follows:

[0056] Step 1, Shaping and Core Making: First, heat carbon, silicon, manganese, chromium, nickel and phosphorus in the following proportions: ≤3%, 1.5-3%, 0.7-1.2%, 0.3-0.8%, 1-5% and ≤0.08%, to 1000-1500℃ and to a liquid state.

[0057] Step 2, Smelting and Spheroidizing Treatment: The obtained molten metal is then smelted in a furnace at a temperature between 800-1200℃ to remove impurities. Then, the molten metal is spheroidized using one of the following methods: immersion method, bell jar method, or wire feeding method.

[0058] Step 3, Inoculation: Next, the spheroidized liquid metal is inoculated. During this process, additives are added to the liquid metal to promote nucleation and grain detachment inside the liquid metal and inhibit internal crystal growth until the liquid metal is inoculated to the point of refining the grain morphology.

[0059] Step 4, Pre-furnace Inspection: Before the inoculation treatment of the molten metal, the form, color, composition, etc. of the obtained molten metal are tested. After the test is completed, the inoculated molten metal is re-furnace purified to obtain the casting liquid.

[0060] Step 5, Pouring: Pour the casting liquid obtained in Step 4 into the molding sand mold through the pre-prepared molding sand gate. After the casting liquid cools and solidifies in the molding sand mold, remove it to obtain the low nickel chromium alloy cast iron butterfly valve blank.

[0061] Step 6, Post-furnace Inspection: The low-nickel chromium alloy cast iron butterfly valve blanks taken out of the heating furnace are then subjected to tensile strength, yield strength and elongation tests. The low-nickel chromium alloy cast iron butterfly valve blanks with tensile strength ≥450MPa, yield strength ≥310MPa and elongation ≥10% are qualified products.

[0062] Step 7, Cleaning: Next, the qualified low-nickel chromium alloy cast iron butterfly valve blank is cleaned. First, open the cover plate, and then place the qualified low-nickel chromium alloy cast iron butterfly valve blank on the surface of the grid 77 on the skeleton 76 inside the cleaning box 1 through the feeding port. Then, control the servo motor 72 to start and drive the concave rod frame 73 to rotate. The concave rod frame 73 drives the connecting rod 75 to rotate back and forth through the rotating cylinder 74. The skeleton 76 is slidably supported by four sets of T-shaped sliders 78 and T-shaped slide rails 71. The connecting rod 75 drives the skeleton 76 and the grid 77 to perform synchronous reciprocating lifting and lowering movements. The synchronous reciprocating lifting and lowering movements of the skeleton 76 and the grid 77 cause the low-nickel chromium alloy cast iron butterfly valve blank to shake up and down, forcing the adhering impurities on the low-nickel chromium alloy cast iron butterfly valve blank to fall off. The adhering impurities fall off through the grid 77 to the bottom of the cleaning box 1.

[0063] At the same time, the concave rod 73 drives the cam 81 to rotate synchronously. The cam 81 drives the piston 84 on the lifting rod 83 to reciprocate in the bottom area of ​​the sealing frame 6 through the slide 82. The return spring 85 provides compression and support compensation for the lifting rod 83. The reciprocating piston 84 generates high-pressure gas in the bottom area of ​​the sealing frame 6. The concave rod 73 drives the main synchronous wheel 91 to rotate synchronously with the cam 81. The main synchronous wheel 91 drives two sets of cleaning rollers 93 on the synchronous wheel 92 to rotate synchronously through the V-belt. The two sets of cleaning rollers 93 use two sets of cleaning brushes 94 to rotate and clean the low-nickel chromium alloy cast iron butterfly valve blank on the grille 77, so that the residual impurities adhering to the surface of the low-nickel chromium alloy cast iron butterfly valve blank are cleaned and removed.

[0064] Next, the high-pressure gas in the bottom area of ​​the sealing frame 6 is supplied from the gas supply pipe 102 through the three-way connector 103 into the two sets of branch pipes 104. Then, the two sets of rotary joints 105 and connectors 95 provide high-pressure gas delivery to the two sets of cleaning rollers 93. The high-pressure gas in the bottom area of ​​the sealing frame 6 reaches the two sets of rotating cleaning rollers 93 and is then sprayed onto the surface of the low-nickel chromium alloy cast iron butterfly valve blank on the grid 77 through the two sets of jet nozzles 101. At the same time, according to the siphon principle, the water in the two sets of water buckets 113 located at the higher position flows into the two water supply pipes 111 through the two sets of connectors 112. The high-pressure gas in the bottom area of ​​the sealing frame 6 is supplied into the two water supply pipes 111, creating a pressurization zone inside. Under the action of high pressure, the water in the two water supply pipes 111 is forced to be supplied into the water distribution plate 116 through the three-way pipe 115 and then evenly sprayed onto the grid 7 by the spray nozzles 117. On the surface of the low-nickel chromium alloy cast iron butterfly valve blank 7, two sets of liquid level sensors 114 detect the water level in the two sets of water tanks 113 in real time. Under the rotating spray of the two sets of jet holes 101 and the uniform spray of the spray nozzles 117, the stubborn impurities adhering to the surface of the low-nickel chromium alloy cast iron butterfly valve blank are cleaned and removed. The impurities that fall to the bottom of the cleaning box 1 are carried by the wastewater through the drain pipe 4 to the water collection tank 5. The wastewater containing impurities is filtered twice by the primary filter screen 14 and the secondary filter screen 15 on the two sets of frames 13. The impurities remain on the primary filter screen 14 and the secondary filter screen 15. The clear wastewater after double filtration is collected at the bottom of the water collection tank 5. After the primary filter screen 14 and the secondary filter screen 15 have reached the predetermined cycle, the two sets of frames 13 can be pulled out from the two sets of slots 12 to clean the remaining impurities on the primary filter screen 14 and the secondary filter screen 15.

[0065] Step 8, Rough and Fine Machining: After cleaning, the low-nickel-chromium alloy cast iron butterfly valve blank is then subjected to rough machining operations such as grinding and drilling. After the rough machining is completed, the low-nickel-chromium alloy cast iron butterfly valve blank is placed in a precision machining tool for fine cutting to obtain the finished low-nickel-chromium alloy cast iron butterfly valve.

[0066] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low nickel-chromium alloy cast iron butterfly valve production equipment comprising a cleaning box (1), characterized in that: The front of the cleaning box (1) is provided with a feeding port, and the inner wall of the feeding port is connected with a cover plate; both sides of the cleaning box (1) are fixedly connected with a support (2); the top of the cleaning box (1) is connected with a top cover (3); the bottom of the cleaning box (1) is connected with a drain pipe (4); and one end of the drain pipe (4) away from the cleaning box (1) is connected with a water collecting tank (5); The back of the cleaning box (1) is fixedly connected with a sealing frame (6); the inner cavity of the cleaning box (1) is provided with a shaking assembly (7); and the inner cavity of the sealing frame (6) is provided with a booster assembly (8); The inner cavity of the cleaning box (1) is provided with a cleaning assembly (9), a gas supply assembly (10) and a water supply assembly (11) respectively; The shaking assembly (7) comprises T-shaped sliding rails (71), four groups of the T-shaped sliding rails (71) are arranged around the inner cavity of the cleaning box (1), one side of the cleaning box (1) close to the cover plate is fixedly connected with a servo motor (72), the output shaft of the servo motor (72) is fixedly connected with a concave rod frame (73), the center of the concave rod frame (73) is rotatably connected with a rotating drum (74), the surface wall of the rotating drum (74) is fixedly connected with a connecting rod (75), one side of the connecting rod (75) away from the rotating drum (74) is hingedly connected with a framework (76), the inner wall of the framework (76) is fixedly connected with a grating (77), and the periphery of the framework (76) is fixedly connected with T-shaped sliding blocks (78) in sliding connection with the T-shaped sliding rails (71); The booster assembly (8) comprises a cam (81), the cam (81) is fixed on one side of the concave rod frame (73) away from the servo motor (72), the surface of the cam (81) is slidably connected with a sliding seat (82), one side of the sliding seat (82) away from the cam (81) is fixedly connected with a lifting rod (83) and a piston (84) in sliding connection with the sealing frame (6), and the outer surface of the lifting rod (83) is sleeved with a return spring (85) fixedly connected with the sealing frame (6) and the piston (84); The cleaning assembly (9) comprises a main synchronous wheel (91), the main synchronous wheel (91) is fixed on one side of the concave rod frame (73) close to the cam (81), both sides of the main synchronous wheel (91) away from the concave rod frame (73) are drivingly connected with slave synchronous wheels (92) through triangular belts, the inner cavities of the two groups of slave synchronous wheels (92) are fixedly connected with cleaning rollers (93) used in cooperation with the grating (77), the periphery of the cleaning roller (93) is fixedly connected with cleaning brush hairs (94), and the two groups of cleaning rollers (93) away from the slave synchronous wheels (92) are connected with connecting heads (95). The air supply assembly (10) comprises air injection holes (101), two groups of the air injection holes (101) are arranged around the cleaning roller (93) close to the cleaning brush (94), the sealing frame (6) is communicated with the air supply pipe (102) on one side close to the piston (84), the other end of the air supply pipe (102) is communicated with the tee joint (103), the two ends of the tee joint (103) are communicated with the branch pipes (104), and the other end of the branch pipe (104) is communicated with the rotary joint (105) rotatingly connected with the connecting head (95); The water supply assembly (11) comprises water supply pipes (111), two groups of the water supply pipes (111) are communicated on the other two sides of the sealing frame (6) close to the piston (84), one end of the two groups of the water supply pipes (111) close to the sealing frame (6) is communicated with the communicating head (112), the inner wall of the communicating head (112) is threadedly connected with the water tank (113), one end of the two groups of the water tank (113) away from the communicating head (112) is embedded with the liquid level sensor (114), and the other end of the two groups of the water supply pipes (111) away from the sealing frame (6) is communicated with the tee pipe (115), the water outlet of the tee pipe (115) is communicated with the water distribution disc (116), and the bottom of the water distribution disc (116) is communicated with the water injection nozzles (117) used in cooperation with the grating (77) around.

2. The low nickel-chromium alloy cast iron butterfly valve production equipment according to claim 1, characterized in that: The upper and lower sides of the inner cavity of the water collecting tank (5) are provided with clamping grooves (12), the inner walls of the two groups of the clamping grooves (12) are clamped with frames (13), and the front surfaces of the frames (13) are fixedly connected with the pull-out frames.

3. The low nickel-chromium alloy cast iron butterfly valve production equipment according to claim 2, characterized in that: The inner cavities of the two groups of the frames (13) are fixedly connected with the first filter screen (14) and the second filter screen (15) respectively, and the mesh shapes of the first filter screen (14) and the second filter screen (15) are rhombic and circular hole-shaped respectively.

4. A production process applied to the production equipment of the low nickel-chromium alloy cast iron butterfly valve according to any one of claims 1-3, characterized in that: The raw material components include: Carbon ≤3%, silicon 1.5-3%, manganese 0.7-1.2%, chromium 0.3-0.8%, nickel 1-5%, and phosphorus ≤0.08%; And the production steps are as follows: Step one, molding and core making: first, heat carbon, silicon, manganese, chromium, nickel and phosphorus according to ≤3%, 1.5-3%, 0.7-1.2%, 0.3-0.8%, 1-5% and ≤0.08% in sequence to 1000-1500℃, and heat to liquid state; Step two, smelting and spheroidizing: then, the obtained metal liquid is subjected to smelting treatment, the smelting furnace temperature ranges between 800-1200℃, the impurities in the metal liquid are removed, and one of the following methods, i.e. the impingement method, the bell method or the wire feeding method, is used to perform spheroidizing treatment on the metal liquid after smelting and impurity removal; Step three, inoculation: then, the metal liquid after spheroidizing treatment is subjected to inoculation treatment, during which, an additive is added to the metal liquid to promote nucleation and grain separation in the metal liquid, inhibit the growth of crystals in the metal liquid, until the metal liquid is inoculated to a fine grain morphology; Step four, furnace detection: before the inoculation treatment of the metal liquid, the morphology, color, composition and the like of the obtained metal liquid are detected, after the detection is completed, the metal liquid after inoculation treatment is subjected to re-melting and purification to obtain a pouring liquid. Step 5, Pouring: Pour the casting liquid obtained in Step 4 into the molding sand mold through the pre-prepared molding sand gate. After the casting liquid cools and solidifies in the molding sand mold, remove it to obtain the low nickel chromium alloy cast iron butterfly valve blank. Step 6, Post-furnace Inspection: The low-nickel chromium alloy cast iron butterfly valve blanks taken out of the heating furnace are then subjected to tensile strength, yield strength and elongation tests. The low-nickel chromium alloy cast iron butterfly valve blanks with tensile strength ≥450MPa, yield strength ≥310MPa and elongation ≥10% are qualified products. Step 7, Cleaning: Next, the qualified low-nickel chromium alloy cast iron butterfly valve blank is cleaned. First, open the cover plate, and then place the qualified low-nickel chromium alloy cast iron butterfly valve blank on the grid (77) surface of the inner skeleton (76) of the cleaning box (1) through the loading port. Then, control the servo motor (72) to turn on and drive the concave rod frame (73) to rotate. The concave rod frame (73) drives the connecting rod (75) to rotate back and forth through the rotating cylinder (74). Four sets of T-shaped sliders (78) and T-shaped slide rails (71) provide sliding support compensation for the skeleton (76). The connecting rod (75) drives the skeleton (76) and the grid (77) to perform synchronous reciprocating lifting and lowering movements. The synchronous reciprocating lifting and lowering movements of the skeleton (76) and the grid (77) drive the low-nickel chromium alloy cast iron butterfly valve blank to shake up and down, forcing the adhering impurities on the low-nickel chromium alloy cast iron butterfly valve blank to fall off. The adhering impurities fall off through the grid (77) to the bottom of the cleaning box (1). At the same time, the concave rod (73) drives the cam (81) to rotate synchronously. The cam (81) drives the piston (84) on the lifting rod (83) to reciprocate in the bottom area of ​​the sealing frame (6) through the slide (82). The return spring (85) provides compression and support compensation for the lifting rod (83). The reciprocating piston (84) generates high pressure gas in the bottom area of ​​the sealing frame (6). The concave rod (73) drives the main synchronous wheel (91) to rotate synchronously with the cam (81). The main synchronous wheel (91) drives two sets of cleaning rollers (93) on the synchronous wheel (92) to rotate synchronously through the V-belt. The two sets of cleaning rollers (93) use two sets of cleaning brushes (94) to rotate and clean the low nickel chromium alloy cast iron butterfly valve blank on the grid (77), so that the residual impurities adhering to the surface of the low nickel chromium alloy cast iron butterfly valve blank are cleaned and removed. Immediately afterwards, the high-pressure gas in the bottom area of ​​the sealing frame (6) is supplied through the gas supply pipe (102) and the three-way connector (103) into the two sets of branch pipes (104). Then, the two sets of rotary joints (105) and connectors (95) deliver the high-pressure gas to the two sets of cleaning rollers (93). The high-pressure gas in the bottom area of ​​the sealing frame (6) reaches the two sets of cleaning rollers (93) that are in a rotating state, and is then sprayed through the two sets of jet holes (101) onto the low-nickel chromium alloy cast iron butterfly valve on the grid (77). On the surface of the embryo, at the same time, according to the siphon principle, the water in the two sets of buckets (113) located at a high position flows into the two water pipes (111) through the two sets of connectors (112), and the high-pressure gas in the bottom area of ​​the sealing frame (6) is supplied into the two water pipes (111), forming a pressurization zone inside them. Under the action of high pressure, the water in the two water pipes (111) is forced to be supplied into the water distribution plate (116) through the three-way pipe (115), and then evenly sprayed onto the grid by the spray nozzle (117). On the surface of the low-nickel-chromium alloy cast iron butterfly valve blank (77), and two sets of liquid level sensors (114) detect the water level in the two sets of water tanks (113) in real time. Under the rotating spray of the two sets of jet holes (101) and the uniform spray of the spray nozzles (117), the stubborn impurities adhering to the surface of the low-nickel-chromium alloy cast iron butterfly valve blank are cleaned and removed. The impurities that fall to the bottom of the cleaning box (1) are followed by the wastewater through the drain pipe (4) to the water collection tank (5), and are then removed by the two sets of frames (13). The primary filter (14) and the secondary filter (15) perform double filtration of wastewater containing impurities. The impurities remain on the primary filter (14) and the secondary filter (15). The clear wastewater after double filtration collects at the bottom of the collection tank (5). After the primary filter (14) and the secondary filter (15) have reached the predetermined cycle of use, the two sets of frames (13) can be pulled out from the two sets of slots (12) to clean the remaining impurities on the primary filter (14) and the secondary filter (15). Step 8, Rough and Fine Machining: After cleaning, the low-nickel-chromium alloy cast iron butterfly valve blank is then subjected to rough machining operations such as grinding and drilling. After the rough machining is completed, the low-nickel-chromium alloy cast iron butterfly valve blank is placed in a precision machining tool for fine cutting to obtain the finished low-nickel-chromium alloy cast iron butterfly valve.

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