A ductile iron pipe water-cooled metal mold centrifuge for an electric drive system

Abstract

The present invention relates to the technical field of ductile iron pipe processing, and specifically, to a water-cooled metal mold centrifuge for ductile iron pipes with an electric drive system. It includes a sector ladle tilting system, a pouring chute, a pipe mold, and a pipe pulling device that are connected in sequence. Among them, the rotation of the pipe mold is controlled by a pipe mold rotation system, and the pipe mold is arranged on a pipe mold traveling system to reciprocate between the pouring chute and the pipe pulling device through the pipe mold traveling system; in this water-cooled metal mold centrifuge for ductile iron pipes with an electric drive system, the flow rate of the molten metal in the first deflector is sensed through a telescopic control mechanism. When the performance of the drive motor is in a normal state, the pouring chute is controlled to be in the original state without interfering with the flow of the molten metal to ensure the qualification rate of the pipes. When the performance of the drive motor decreases, the pouring chute is automatically extended to prevent the molten metal from flowing to the ground and also avoid affecting the subsequent movement of the pipe mold.

Description

Technical Field

[0001] The present invention relates to the technical field of ductile iron pipe processing, and specifically, to a water-cooled metal mold centrifuge for ductile iron pipes with an electric drive system. Background Art

[0002] Centrifugal casting is a casting method in which liquid metal is poured into a rotating mold and forms and solidifies into a casting under the action of centrifugal force. The machine used for centrifugal casting is called a centrifugal casting machine. The quality evaluation indexes of the cast pipes produced by the centrifugal casting machine are: the uniformity of the wall thickness of the cast pipe and the weight of the pipe, and the main factors affecting these two evaluation indexes are the flipping speed of the sector ladle of the centrifugal casting machine and the speed of the traveling system of the centrifugal pipe casting machine.

[0003] In the past, the flipping system of the sector ladle and the traveling system of the pipe mold of the water-cooled centrifugal pipe casting machine were both driven by oil cylinders. During the working process, affected by the oil temperature and load, it was very difficult for the oil cylinders to ensure that the flipping speed of the sector ladle flipping system and the speed of the pipe mold traveling system were uniform speeds, which would affect the qualification rate of the cast pipes and also waste a large amount of molten iron.

[0004] Currently, in the related art, by changing all the flipping of the sector ladle and the traveling of the centrifugal pipe casting machine to an electric drive system and using a motor for stable drive, the qualification rate of the cast pipes is improved. However, the motor of the sector ladle flipping system is usually arranged below the sector ladle. Since both the top of the sector ladle and the top of the pouring chute are designed with openings, during the pouring process of the molten iron, the molten iron is converted from potential energy to kinetic energy, resulting in small sparks splashing. The sparks will splash around the motor, thereby increasing the temperature of the environment where the motor is located and degrading the performance of the motor.

[0005] When the performance of the motor of the sector ladle flipping system deteriorates, the flipping speed of the sector ladle will decrease, so that when the molten iron in the sector ladle has not been completely poured out, the pipe mold traveling system has already driven the pipe mold away from the pouring chute, causing some molten iron to flow to the outside, which not only causes waste but also may affect the movement of the pipe mold. Summary of the Invention

[0006] The purpose of the present invention is to provide a water-cooled metal mold centrifuge for ductile iron pipes with an electric drive system to solve the problems raised in the above background art.

[0007] To achieve the above object, a ductile iron pipe water-cooled metal mold centrifuge for an electric drive system is provided, which includes a sector ladle tilting system, a pouring chute, a pipe mold, and a pipe pulling device connected in sequence. Among them, the rotation of the pipe mold is controlled by a pipe mold rotation system, and the pipe mold is arranged on a pipe mold traveling system to reciprocate between the pouring chute and the pipe pulling device through the pipe mold traveling system; the pouring chute is a telescopic structure, and a telescopic control mechanism connected to the sector ladle tilting system is also arranged inside the pouring chute. The telescopic control mechanism is located on the path of the molten metal flow. When the flow rate of the molten metal is lower than the preset flow rate, the telescopic control mechanism controls the pouring chute to extend by using the tilting power of the sector ladle tilting system to reduce the speed at which the pouring chute disengages from the inside of the pipe mold;

[0008] Among them, the movable distance of the pipe mold is greater than the length of the pouring chute after extension, and the pipe mold is in a horizontal state.

[0009] As a further improvement of this technical solution, the sector ladle tilting system includes a bracket and a sector ladle rotatably arranged on the bracket. A second connecting rod is connected to the sector ladle. One end of the second connecting rod is rotatably connected to one end of a first connecting rod, and the other end of the first connecting rod is rotatably connected to a gear disc. The gear disc is rotatably arranged on the bracket, and the outer ring of the gear disc is connected to a driving motor arranged on the bracket.

[0010] As a further improvement of this technical solution, the pouring chute includes a first diversion plate and a second diversion plate. Both the first diversion plate and the second diversion plate are semi-circular structures with open tops, and the second diversion plate is slidably arranged at the bottom of the first diversion plate. At the same time, rollers supporting the bottom of the second diversion plate are arranged at the bottom of the first diversion plate;

[0011] Both the first diversion plate and the second diversion plate are in an inclined state with one end facing the sector ladle tilting system being higher and the other end being lower.

[0012] As a further improvement of this technical solution, a flow limiting plate is fixedly arranged inside the first diversion plate near the end facing the sector ladle tilting system. Both sides of the flow limiting plate are attached to the inside of the first diversion plate, and a flow limiting orifice is formed between the bottom end and the bottom of the first diversion plate for the preset flow rate.

[0013] As a further improvement of this technical solution, the telescopic control mechanism includes a driving mechanism. The driving mechanism includes a cam and a pulley coaxially and fixedly connected to the cam. The cam is rotatably arranged on a rotating shaft on the side wall of the first diversion plate. A connecting rope is arranged at the top of the outer ring of the pulley. One end of the connecting rope is fixedly connected to the gear disc, and the other end is connected to a counterweight.

[0014] As a further improvement of the technical solution, the telescopic control mechanism further includes a limiting component, and the limiting component includes a clamping plate and a sliding rod;

[0015] The clamping plate is in a U-shaped structure with an opening facing downward, and both ends of the clamping plate are longitudinally slidably arranged on the outer walls on both sides of the first diversion plate;

[0016] The bottom end of the sliding rod longitudinally slides through the clamping plate and is fixedly connected with a floating ball, and the top end extends to the outer ring of the cam; when the height of the molten metal in the first diversion plate is not lower than the height of the current-limiting orifice, the top end of the sliding rod is driven out of the driving range of the cam through the floating ball.

[0017] As a further improvement of the technical solution, the coefficient of thermal expansion of the sliding rod is greater than that of the clamping plate, so that when both the sliding rod and the clamping plate undergo thermal expansion, the sliding connection between the sliding rod and the clamping plate is changed to a frictional connection.

[0018] As a further improvement of the technical solution, the floating ball is made of a material with heat resistance and a density less than that of the molten metal.

[0019] As a further improvement of the technical solution, the telescopic control mechanism further includes connecting ears fixedly arranged on both sides at one end of the second diversion plate. The connecting ears are located below the clamping plate, and a convex block is fixedly arranged at one end of the top of the connecting ear. The height of the top end of the convex block is higher than the height of the bottom end of the clamping plate, and the minimum distance for the cam to push the sliding rod upward is greater than the distance for the clamping plate to move upward and disengage from the convex block.

[0020] As a further improvement of the technical solution, when the performance of the driving motor is in a normal state, the driving motor controls the flow rate of the molten metal poured out by the sector ladle to be greater than the flow rate of the molten metal passing through the current-limiting orifice, so that part of the molten metal in the first diversion plate is intercepted by the current-limiting plate to increase the liquid level height of the molten metal.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. In the ductile iron pipe water-cooled metal mold centrifuge of the electric drive system, the flow rate of the molten metal in the first diversion plate is sensed through the telescopic control mechanism. When the performance of the driving motor is in a normal state, the pouring chute is controlled to be in the original state without interfering with the flow of the molten metal to ensure the qualification rate of the pipe. When the performance of the driving motor decreases, the pouring chute is automatically extended to prevent the molten metal from flowing to the ground and also avoid affecting the subsequent movement of the pipe mold.

[0023] 2. In the ductile iron pipe water-cooled metal mold centrifuge of this electric drive system, the second deflector plate extends during the movement of the pipe mold, and the extension speed of the pouring chute is slower than the movement speed of the pipe mold. Therefore, the second deflector plate will continuously change the pouring position of the molten metal in the pouring chute during the movement, that is, it can guide the molten metal to different positions in the pipe mold, thereby improving the thickness uniformity of the formed pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 is a schematic diagram of the structure of the sector ladle tilting system of the present invention;

[0026] Figure 3 is a schematic diagram of the structure of the pouring chute of the present invention;

[0027] Figure 4 is a schematic diagram of the structure of the flow limiting orifice of the present invention;

[0028] Figure 5 is a schematic diagram of the structure of the limiting component of the present invention;

[0029] Figure 6 is a schematic diagram of the structure of the sliding rod of the present invention Figure 1 ;

[0030] Figure 7 is a schematic diagram of the structure of the sliding rod of the present invention Figure 2 ;

[0031] Figure 8 is a schematic diagram of the state of the second deflector plate of the present invention.

[0032] The meanings of the various reference numerals in the figure are as follows:

[0033] 100, sector ladle tilting system; 101, bracket; 102, sector ladle; 103, drive motor; 104, gear disk; 105, first connecting rod; 106, second connecting rod; 200, pouring chute; 201, liquid receiving tank; 210, first deflector plate; 211, support rod; 212, roller; 213, resistance rod; 214, current limiting plate; 215, flow limiting orifice; 216, rotating shaft; 220, second deflector plate; 221, rib; 222, connecting ear; 223, convex block; 230, limiting component; 231, clamping plate; 232, sliding rod; 233, floating ball; 240, drive mechanism; 241, cam; 242, pulley; 243, connecting rope; 244, counterweight; 300, pipe mold; 400, pipe pulling device; 500, pipe mold traveling system. DETAILED DESCRIPTION OF THE INVENTION

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0035] Please refer to Figure 1 As shown, a ductile iron pipe water-cooled metal mold centrifuge for an electric drive system is provided, which includes a sector ladle tilting system 100, a pouring chute 200, a pipe mold 300, and a pipe pulling device 400 that are connected in sequence. Among them, the rotation of the pipe mold 300 is controlled by a pipe mold rotation system, and the pipe mold 300 is arranged on a pipe mold traveling system 500 to reciprocate between the pouring chute 200 and the pipe pulling device 400 through the pipe mold traveling system 500; the pouring chute 200 is a telescopic structure, and a telescopic control mechanism connected to the sector ladle tilting system 100 is further arranged inside the pouring chute 200. The telescopic control mechanism is located on the path of the molten metal flow. When the flow rate of the molten metal is lower than a preset flow rate, the telescopic control mechanism controls the pouring chute 200 to extend by using the tilting power of the sector ladle tilting system 100 to reduce the speed at which the pouring chute 200 disengages from the inside of the pipe mold 300.

[0036] Among them, the movable distance of the pipe mold 300 is greater than the length of the pouring chute 200 after extension, so as to avoid the pouring chute 200 extending into the pipe mold 300 and affecting subsequent processes after the pipe is formed in the pipe mold 300. And, the pipe mold 300 is in a horizontal state.

[0037] It should be understood that both the sector ladle tilting system 100 and the pipe mold traveling system 500 adopt electric drive systems. The electric drive structure of the pipe mold traveling system 500 is the same as or similar to that of the Chinese patent with the publication number CN106825481B, so it will not be elaborated here.

[0038] Next, the structure of the sector ladle tilting system 100 will be mainly disclosed. As Figure 2As shown, the fan-shaped ladle flipping system 100 includes a bracket 101 and a fan-shaped ladle 102 rotatably arranged on the bracket 101. A second connecting rod 106 is connected to the fan-shaped ladle 102. One end of the second connecting rod 106 is rotatably connected to one end of a first connecting rod 105, and the other end of the first connecting rod 105 is rotatably connected to a gear disk 104. The gear disk 104 is rotatably arranged on the bracket 101, and the outer ring of the gear disk 104 is connected to a driving motor 103 arranged on the bracket 101. Specifically, a gear is fixedly arranged on the output shaft of the driving motor 103, and the gear meshes with the gear disk 104. In this way, by driving the gear disk 104 to rotate through the driving motor 103, the rotation of the gear disk 104 drives the fan-shaped ladle 102 to rotate through the first connecting rod 105 and the second connecting rod 106, and the rotation of the fan-shaped ladle 102 pours the molten metal inside into the pouring chute 200.

[0039] As Figure 3 shown, the pouring chute 200 includes a first guide plate 210 and a second guide plate 220. Both the first guide plate 210 and the second guide plate 220 are semi-circular structures with open tops, and the second guide plate 220 is slidably arranged at the bottom of the first guide plate 210. At the same time, rollers 212 supporting the bottom of the second guide plate 220 are arranged at the bottom of the first guide plate 210 to prevent the second guide plate 220 from falling. At the same time, both the first guide plate 210 and the second guide plate 220 are in an inclined state with one end towards the fan-shaped ladle flipping system 100 being higher and the other end being lower.

[0040] Moreover, a liquid receiving trough 201 is fixedly connected to the end of the first guide plate 210 close to the fan-shaped ladle flipping system 100, and the liquid receiving trough 201 is fixedly connected to the bracket 101. The liquid receiving trough 201 is in a fan-shaped state with the end close to the fan-shaped ladle 102 being wider and the other end being narrower to prevent the liquid poured out from the fan-shaped ladle 102 from flowing to the ground.

[0041] As Figure 4As shown in the figure, a flow limiting plate 214 is fixedly arranged inside one end of the first deflector 210 close to the sector package turnover system 100. Both sides of the flow limiting plate 214 are attached to the inside of the first deflector 210, and the bottom end does not contact the bottom of the first deflector 210, so as to form a flow limiting orifice 215. In the above, the preset flow rate is also achieved through the flow limiting orifice 215. The size of the flow limiting orifice 215 determines the passing speed of the molten metal. By setting the size of the flow limiting orifice 215 and the moving speed of the pipe mold 300 to a corresponding state, in this way, when there is more molten metal in the first deflector 210, the flow limiting plate 214 blocks the excess molten metal in the front (towards the direction of the sector package turnover system 100), so that the flow rate of the molten metal behind the flow limiting plate 214 (towards the direction of the pipe mold 300) corresponds to the moving speed of the pipe mold 300. And the flow rate of the molten metal being lower than the preset flow rate means that the height of the molten metal in the first deflector 210 is lower than the height of the flow limiting orifice 215, that is, the maximum liquid discharge flow rate of the flow limiting orifice 215 cannot be reached.

[0042] The telescopic control mechanism includes a limiting component 230 and a driving mechanism 240:

[0043] As Figures 2 - 5 shown, the driving mechanism 240 includes a cam 241 (it is preferred to set a plurality of protruding parts on the outer ring of the cam 241 to facilitate driving the slide bar 232 in time, and the specific shape can be referred to Figure 5 ), and a pulley 242 coaxially and fixedly connected to the cam 241. The cam 241 is rotatably arranged on a rotating shaft 216 on the side wall of the first deflector 210. A connecting rope 243 is arranged at the top of the outer ring of the pulley 242. One end of the connecting rope 243 is fixedly connected to the gear disk 104, and the other end is connected with a counterweight 244.

[0044] As Figure 5 shown, the limiting component 230 includes a clamping plate 231 and a slide bar 232. The clamping plate 231 has a U-shaped structure with an open bottom. Both ends of the clamping plate 231 are longitudinally slidably arranged on the outer walls on both sides of the first deflector 210; the bottom end of the slide bar 232 longitudinally slides through the clamping plate 231, and then is fixedly connected with a floating ball 233, and the top end extends to the outer ring of the cam 241. And when the height of the molten metal in the first deflector 210 is not lower than the height of the flow limiting orifice 215, the top end of the slide bar 232 is out of the driving range of the cam 241 through the floating ball 233.

[0045] The floating ball 233 is preferably of a hollow structure to improve the floating effect on the surface of the molten metal. In this way, when the molten metal flows in the first deflector 210, the molten metal can drive the floating ball 233 to float and move up through the thrust generated on the arc surface of the floating ball 233 during the flowing process, or the buoyancy exerted on the floating ball 233.

[0046] At the same time, the slide bar 232 and the card plate 231 are both made of metal, clay or graphite, and the thermal expansion coefficient of the slide bar 232 is greater than the thermal expansion coefficient of the card plate 231. In this way, when the slide bar 232 and the card plate 231 both undergo thermal expansion, due to the large thermal expansion coefficient of the slide bar 232, the outer wall of the slide bar 232 will be tightly attached to the side wall of the penetrated part of the card plate 231, so that the slide bar 232 and the card plate 231 are changed from a sliding connection to a friction connection. And in order to increase the friction between the two, such as Figure 6 As shown, the portion where the card plate 231 is penetrated can be raised to increase the contact area between the slide bar 232 and the card plate 231 .

[0047] Moreover, the volume of the float 233 is slightly smaller than the space in the first guide plate 210, so that the metal liquid can always impact the arc surface of the lower part of the float 233, avoiding impacting the arc surface of the upper part of the float 233, and ensuring that the float 233 is always in a state of being pushed upward or floating. At the same time, the float 233 is made of a material with strong heat resistance, such as graphite, clay, etc. And the density of these materials is less than the density of the metal liquid, which can ensure that the metal liquid can push the float 233 upward or float the float 233.

[0048] In addition, the float 233 can also be replaced by an inclined plate in an inclined state. When the metal liquid flows in the first guide plate 210, the inclined plate is pushed upward by the inclined plate of the inclined plate.

[0049] The structure of the clamping plate 231 longitudinally slidingly arranged on both sides of the first guide plate 210 is as follows Figure 5 As shown, protrusions are provided on both side outer walls of the first guide plate 210 , and vertical sliding grooves are provided at both ends of the clamping plate 231 , in which the protrusions are located, thereby realizing the longitudinal sliding connection of the clamping plate 231 on the side walls of the first guide plate 210 .

[0050] like Figure 5 As shown, the telescopic control mechanism also includes connecting ears 222 fixedly arranged on both sides of one end of the second guide plate 220, the connecting ears 222 are located below the card plate 231, and a protrusion 223 is fixedly arranged at one end of the top of the connecting ears 222, the height of the top of the protrusion 223 is higher than the height of the bottom of the card plate 231, and the minimum distance that the cam 241 pushes the slide bar 232 upward is greater than the distance that the card plate 231 moves upward and separates from the protrusion 223. At the same time, the side of the slide bar 232 away from the card plate 231 is inclined (the advantage of the inclined setting is that when the second guide plate 220 needs to be reset after being extended, the second guide plate 220 will move toward the card plate 231, and when the inclined surface of the protrusion 223 contacts the card plate 231, the inclined surface of the protrusion 223 pushes up the card plate 231, and at this time, the protrusion 223 passes through the card plate 231, and then the card plate 231 slides downward and resets by gravity to block the protrusion 223).

[0051] That is, the flow rate of the molten metal in the first guide plate 210 is sensed by the telescopic control mechanism. When the performance of the driving motor 103 is in a normal state, the pouring trough 200 is controlled to be in the original state, and the flow of the molten metal is not interfered with, so as to ensure the qualified rate of the pipe. When the performance of the driving motor 103 is reduced, the pouring trough 200 is automatically extended to prevent the molten metal from flowing to the ground, and also to avoid affecting the subsequent movement of the pipe mold 300.

[0052] At the same time, the second guide plate 220 is extended during the movement of the tube mold 300, and the extension speed of the casting flow channel 200 is slower than the movement speed of the tube mold 300. Therefore, the second guide plate 220 will continuously change the pouring position of the metal liquid in the casting flow channel 200 during the movement, that is, the metal liquid can be guided to different positions in the tube mold 300, thereby improving the uniformity of the thickness of the tube after forming.

[0053] Working principle:

[0054] The metal liquid in the fan-shaped bag 102 is poured into the liquid receiving tank 201, and then flows into the first guide plate 210 through the liquid receiving tank 201. Figure 6 As shown, if the performance of the driving motor 103 is reduced, the turning speed of the fan-shaped bag 102 will be slowed down, and the metal liquid entering the first guide plate 210 will be less. At this time, the height of the metal liquid in the first guide plate 210 is lower than the height of the flow restriction port 215. Since the metal liquid is less, the distance that the metal liquid pushes the float 233 upward is limited. At this time, the top of the slide bar 232 is still in the driving path of the cam 241. Then, the temperature of the metal liquid will be transferred to the slide bar 232 through the float 233 or the air. Since the thermal expansion coefficient of the slide bar 232 is greater than the thermal expansion coefficient of the card plate 231, the outer ring of the slide bar 232 is tightly attached to the inner ring of the penetrated part of the card plate 231, forcing the friction between the slide bar 232 and the card plate 231 to increase. At the same time, when the driving motor 103 drives the gear plate 104 to rotate, the gear plate 104 pulls the connecting rope 243 to move, the connecting rope 243 drives the pulley 242 to rotate, and the pulley 242 drives the cam 241 to rotate. Since the slide bar 232 has not deviated from the driving range of the cam 241, the protruding part of the cam 241 pushes the slide bar 232 upward, and the slide bar 232 drives the card plate 231 to move upward through the friction force. The card plate 231 moves up and away from the top of the protrusion 223. At this time, the card plate 231 no longer blocks the protrusion 223, and then the second guide plate 220 can move toward the pipe mold 300 (because the second guide plate 220 is in an inclined state). Figure 8 As shown, the tube mold 300 is also moving, and the second guide plate 220 is also moving, so that it can be ensured that the liquid in the fan-shaped bag 102 has enough time to flow into the tube mold 300.

[0055] After the second deflector 220 extends, manually reset the second deflector 220. During pouring, the second deflector 220 is not manually pushed towards the mold 300 because the sparks generated by the flow of molten metal can cause harm to the operator.

[0056] When the flipping speed of the ladle 102 is normal, as Figure 7 shown, the molten metal in the first deflector 210 will push the float 233 to a higher position. At this time, since the upward movement distance of the slide bar 232 becomes larger, the slide bar 232 will then move out of the driving range of the cam 241. In this state, the clamping plate 231 will not move upward, and the second deflector 220 cannot extend.

[0057] It should be understood that the centrifugal casting machine of the present invention mainly ensures that the molten metal can all flow into the mold 300 when the performance of the ladle 102 deteriorates, so that the molten metal will not flow to the ground, avoiding waste, and at the same time preventing the molten metal flowing to the ground from affecting the subsequent movement of the mold 300. Regarding the quality of the formed pipe, the forming speed of the molten metal in the mold 300 can be slowed down by heating, so that the molten metal automatically flows to each part in the mold 300, or the thickness and specifications of the pipe are reduced, and the inner wall is polished to trim the pipe.

[0058] It should be noted that when the liquid first flows into the first deflector 210, it will first push the float 233 upward, and then transfer heat to the slide bar 232. At this time, the clamping plate 231 will frictionally connect with the slide bar 232.

[0059] Moreover, to ensure the accuracy of the upward movement of the slide bar 232, when the performance of the driving motor 103 is normal, the driving motor 103 controls the flow rate of the molten metal poured out by the ladle 102 to be greater than the flow rate of the molten metal passing through the flow limiting orifice 215, so that part of the molten metal in the first deflector 210 is intercepted by the flow limiting plate 214. In this way, the liquid level in front of the flow limiting plate 214 (towards the direction of the float 233) becomes higher, and the upward movement distance of the float 233 is also higher. It can be avoided that when the height of the molten metal is the same as the top height of the flow limiting orifice 215, the slide bar 232 may come into contact with the cam 241. That is to say, this can ensure that when the driving motor 103 is normal, the slide bar 232 can always stably move out of the cam 241 and will not contact the cam 241. Only when the performance of the driving motor 103 deteriorates, the slide bar 232 will contact the cam 241.

[0060] Moreover, one end of the bottom of the first deflector 210 close to the sector package flipping system 100 is fixedly connected to a support rod 211. One end of the support rod 211 extends to the bottom of the second deflector 220. A roller 212 is rotatably arranged on the side wall of the second deflector 220. The end of the support rod 211 is threadedly connected to a resistance rod 213 that can move towards the roller 212. In this way, since the first deflector 210 and the second deflector 220 themselves are inclined downward towards the pipe mold 300, when the clamping plate 231 moves upward and disengages from the convex block 223, the second deflector 220 will slide towards the pipe mold 300 due to its own gravity. At this time, by pressing the clamping plate 231 against the outer wall of the roller 212, the rotation speed of the roller 212 is reduced, thereby reducing the extending speed of the second deflector 220 and making the extending speed of the second deflector 220 slightly slower than the moving speed of the pipe mold 300. In this way, during the movement of the pipe mold 300, the distance between the second deflector 220 and the pipe mold 300 will gradually increase. Therefore, the second deflector 220 can guide the molten metal to the side wall of the pipe mold 300, improving the quality of the formed pipe.

[0061] Meanwhile, to prevent the second deflector 220 from detaching from the first deflector 210 during the extending process, as Figure 4 shown, a groove is provided on the outer circle of the first deflector 210. The two ends of the groove do not penetrate the first deflector 210. At the same time, a rib 221 located in the groove is fixedly arranged on the inner wall of the second deflector 220. In this way, the groove can limit the second deflector 220 and prevent the second deflector 220 from detaching from the first deflector 210.

[0062] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A ductile iron pipe water-cooled metal mold centrifuge with an electric drive system, comprising a fan-shaped bag turning system (100), a pouring chute (200), a pipe mold (300) and a pipe pulling device (400) connected in sequence, wherein: The rotation of the tube mold (300) is controlled by a tube mold rotation system, and the tube mold (300) is arranged on a tube mold walking system (500) so as to reciprocate between a casting trough (200) and a tube pulling device (400) through the tube mold walking system (500); the invention is characterized in that: the casting trough (200) is a telescopic structure, and a telescopic control mechanism connected to a fan-shaped bag turning system (100) is also arranged inside the casting trough (200), the telescopic control mechanism is located on the path of the metal liquid flow, and when the flow rate of the metal liquid is lower than a preset flow rate, the telescopic control mechanism uses the power of the turning of the fan-shaped bag turning system (100) to control the extension of the casting trough (200) so as to reduce the speed at which the casting trough (200) is separated from the inside of the tube mold (300); The movable distance of the tube mold (300) is greater than the length of the casting trough (200) after extension, and the tube mold (300) is in a horizontal state.

2. The ductile iron pipe water-cooled metal mold centrifuge of the electric drive system according to claim 1, characterized in that: The fan-shaped bag turning system (100) comprises a bracket (101), and a fan-shaped bag (102) rotatably mounted on the bracket (101); a second connecting rod (106) is connected to the fan-shaped bag (102); one end of the second connecting rod (106) is rotatably connected to one end of a first connecting rod (105); the other end of the first connecting rod (105) is rotatably connected to a gear plate (104); the gear plate (104) is rotatably mounted on the bracket (101), and an outer ring of the gear plate (104) is connected to a driving motor (103) mounted on the bracket (101).

3. The ductile iron pipe water-cooled metal mold centrifuge of the electric drive system according to claim 2, characterized in that: The pouring trough (200) comprises a first guide plate (210) and a second guide plate (220), the first guide plate (210) and the second guide plate (220) are both semicircular structures with the tops in an open state, and the second guide plate (220) is slidably arranged at the bottom of the first guide plate (210), and a roller (212) supported at the bottom of the second guide plate (220) is arranged at the bottom of the first guide plate (210); The first guide plate (210) and the second guide plate (220) are both in an inclined state with one end higher and the other end lower towards the fan-shaped bag turning system (100).

4. The ductile iron pipe water-cooled metal mold centrifuge of the electric drive system according to claim 3, characterized in that: A flow limiting plate (214) is fixedly disposed inside the first flow guide plate (210) near one end of the fan-shaped bag turning system (100); two sides of the flow limiting plate (214) fit the inside of the first flow guide plate (210); a flow limiting opening (215) is formed between the bottom end and the bottom of the first flow guide plate (210) for presetting the flow rate.

5. The ductile iron pipe water-cooled metal mold centrifuge of the electric drive system according to claim 4, characterized in that: The telescopic control mechanism comprises a driving mechanism (240), the driving mechanism (240) comprising a cam (241) and a pulley (242) coaxially fixedly connected to the cam (241), the cam (241) being rotatably disposed on a rotating shaft (216) on a side wall of the first guide plate (210), a connecting rope (243) being disposed at the top of an outer ring of the pulley (242), one end of the connecting rope (243) being fixedly connected to a gear plate (104), and the other end of the connecting rope being connected to a counterweight (244).

6. The ductile iron pipe water-cooled metal mold centrifuge of the electric drive system according to claim 5, characterized in that: The telescopic control mechanism further comprises a limit assembly (230), wherein the limit assembly (230) comprises a clamping plate (231) and a sliding rod (232); The clamping plate (231) is in a U-shaped structure with its opening facing downwards, and both ends of the clamping plate (231) are longitudinally slidably arranged on the outer walls of both sides of the first guide plate (210); The bottom end of the slide bar (232) slides longitudinally through the clamping plate (231) and is fixedly connected to the float ball (233), and the top end extends to the outer ring of the cam (241); when the height of the metal liquid in the first guide plate (210) is not lower than the height of the flow limiting port (215), the top end of the slide bar (232) is separated from the driving range of the cam (241) through the float ball (233).

7. The ductile iron pipe water-cooled metal mold centrifuge of the electric drive system according to claim 6, characterized in that: The thermal expansion coefficient of the sliding rod (232) is greater than the thermal expansion coefficient of the card plate (231), so that when both the sliding rod (232) and the card plate (231) undergo thermal expansion, the sliding connection between the sliding rod (232) and the card plate (231) is changed to a friction connection.

8. The ductile iron pipe water-cooled metal mold centrifuge of the electric drive system according to claim 6, characterized in that: The float (233) is made of a material having heat resistance and a density lower than that of the metal liquid.

9. The ductile iron pipe water-cooled metal mold centrifuge of the electric drive system according to claim 6, characterized in that: The telescopic control mechanism further comprises connecting ears (222) fixedly arranged on both sides of one end of the second guide plate (220), the connecting ears (222) being located below the clamping plate (231), and a protrusion (223) being fixedly arranged at one end of the top of the connecting ears (222), the top of the protrusion (223) being higher than the bottom of the clamping plate (231), and the minimum distance that the cam (241) pushes the slide bar (232) upward is greater than the distance that the clamping plate (231) moves upward to separate from the protrusion (223).

10. The ductile iron pipe water-cooled metal mold centrifuge of the electric drive system according to claim 4, characterized in that: When the performance of the drive motor (103) is in a normal state, the drive motor (103) controls the flow rate of the metal liquid poured out of the fan-shaped bag (102) to be greater than the flow rate of the metal liquid when passing through the flow restriction port (215), so that part of the metal liquid in the first guide plate (210) is intercepted by the flow restriction plate (214).

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