Centrifugal casting machine for manufacturing ship tail shaft

Abstract

The invention relates to the technical field of centrifugal casting machines, in particular to a centrifugal casting machine for manufacturing a ship stern shaft, which comprises a mounting shell fixedly connected with a connecting plate, an inserting rod on the outer side of a pouring basin penetrates through a connecting frame and then is inserted into the mounting shell, and a clamping part is arranged in the mounting shell. A pneumatic telescopic rod is arranged at the end, close to the mounting shell, of the clamping part, a ventilation pipe is arranged at one end of the pneumatic telescopic rod, an adapter is arranged at one end of the ventilation pipe, and an end cover matched with the inserting rod is arranged on one side of the adapter. The speed reduction assembly is arranged, when the inclination speed of the pouring basin is too high, the inclination speed of the pouring basin can be effectively reduced, the pouring basin tends to be in a stable state, and the possibility that molten steel in the pouring basin is poured to the outside due to the fact that the inclination angle of the pouring basin is too large is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of centrifugal casting machines, and in particular to a centrifugal casting machine for manufacturing a ship stern shaft. Background Art

[0002] The stern shaft, also known as the tail shaft, is the last section of the shaft system. The head end flange and the intermediate shaft flange are connected with tight-fitting bolts. The tail end is conical in shape for installing the propeller. The ship's stern shaft is generally manufactured by centrifugal casting.

[0003] Centrifugal casting is a casting method in which liquid metal is poured into a rotating mold, which is filled and solidified into a casting under the action of centrifugal force. The machine used for centrifugal casting is called a centrifugal casting machine.

[0004] According to the direction of the rotating axis of the centrifugal casting machine, centrifugal casting machines are divided into three types: horizontal, vertical and inclined. Among them, the horizontal centrifugal casting machine is mainly used for casting various tubular castings. It can cast various carbon steel, alloy steel pipes and double-layer steel rollers with different compositions of the inner and outer layers.

[0005] With respect to the above-mentioned related technologies, the inventors found that there are at least the following technical problems in the process of implementing the technical solutions: during the casting process of the centrifugal casting machine, the pouring basin is suspended above the pouring port of the centrifugal casting machine by a crane, and the molten steel for casting is poured into the mold of the centrifugal casting machine. Generally, the pouring basin is directly driven to rotate by a rotating motor to achieve the tilting of the pouring basin. However, the direct drive of the motor can easily cause shaking, pauses and jitters in the pouring basin during the tilting process, which can easily cause the molten steel inside the pouring basin to shake violently due to inertia, and when the tilt angle of the pouring basin changes greatly in a short period of time, the molten steel inside the pouring basin will spill to the outside of the pouring basin, which is very dangerous. Summary of the invention

[0006] In view of the above-mentioned shortcomings of the prior art, the present application provides a centrifugal casting machine for manufacturing a ship stern shaft, comprising a centrifugal machine, a truss, a housing with a built-in driving unit, a connecting frame and a pouring basin, and also comprising a traction mechanism arranged between the pouring basin and the housing. The traction mechanism comprises a mounting frame fixed inside the shell, a driving motor is arranged on the mounting frame, a screw is arranged at the output end of the driving motor, a collar matching the screw is sleeved on the screw, the collar slides on the screw, a connecting piece is arranged at the lower end of the collar, a traction steel cable is arranged at one end of the connecting piece, an auxiliary rod is arranged inside the mounting frame, one end of the traction steel cable is wound around the outside of the auxiliary rod and connected to the lower end of the outer wall of the pouring basin, a plug-in rod is arranged at the position where the pouring basin is connected to the connecting frame, and a speed reduction assembly is arranged at one end of the plug-in rod that passes through the connecting frame; The deceleration assembly includes a mounting shell fixedly connected to the connecting plate, the plug-in rod on the outer side of the pouring basin passes through the connecting frame and is plugged into the mounting shell, a clamping portion is provided inside the mounting shell, a pneumatic telescopic rod is provided at one end of the clamping portion close to the mounting shell, a ventilation pipe is provided at one end of the pneumatic telescopic rod, an adapter is provided at one end of the ventilation pipe, an end cover matching the plug-in rod is provided on one side of the adapter, the other side of the adapter passes through the mounting shell and extends to the outside, a pneumatic assembly is provided at one end of the connecting piece away from the traction cable, and the end of the adapter passing through the mounting shell is connected to the pneumatic assembly through an air pipe.

[0007] Furthermore, a rolling bearing is provided at one end of the plug-in rod that passes through the connecting frame. The rolling bearing is sleeved on the plug-in rod and fixedly connected to the connecting frame. The plug-in rod is rotatably connected to the connecting frame via the rolling bearing.

[0008] Furthermore, the clamping portion includes a plurality of fixing plates fixedly connected to the inner side wall of the mounting shell, the plurality of fixing plates are evenly distributed along the circumference of the plug-in rod, an arc-shaped connecting spring is provided at one end of the fixing plate, a fixing block is provided on the surface of the connecting spring away from the plug-in rod, the upper end of the fixing block is fixedly connected to the traveling end of the pneumatic telescopic rod, and a friction plate is provided on the other side of the connecting spring and close to the plug-in rod.

[0009] Furthermore, the outer side of the plug rod is provided with a plurality of first protrusions evenly distributed along the circumference of the plug rod, and the surface of the friction plate on one side close to the plug rod is provided with a plurality of second protrusions with the same structure as the first protrusions, and the first protrusions are parallel to the second protrusions.

[0010] Furthermore, the pneumatic component includes a double-tube air nozzle connected to the adapter, one end of the double-tube air nozzle is provided with an air collecting hood, one end of the air collecting hood is provided with a side plate, a surface of the side plate is provided with a plurality of air holes, one end of the side plate is provided with a pneumatic shell, the pneumatic shell is fixedly connected to the ring on the screw, a movable plate slidably connected to the pneumatic shell is provided inside the pneumatic shell, an air chamber is provided inside the pneumatic shell, the air chamber is located between the movable plate and the side plate, a plurality of auxiliary ropes are provided on the surface of the movable plate close to the traction steel cable, one end of the auxiliary rope is fixedly connected to the traction steel cable, the other end of the auxiliary rope is fixedly connected to the movable plate, and a traction spring is provided between the side plate and the movable plate.

[0011] Furthermore, a magnetic attraction portion is provided at one end of the traction steel cable connected to the auxiliary rope, and the magnetic attraction portion includes a connecting rod fixedly connected to the traction steel cable, one end of the connecting rod is inserted into the interior of the mounting shell, and the end of the connecting rod inserted into the mounting shell passes through the movable plate, and a turntable is provided at one end of the connecting rod located inside the mounting shell, and a plurality of second magnets uniformly distributed along the circumference of the turntable are provided on the surface of the turntable, and a first magnet attracted to the second magnet is provided at the center position of the side surface of the side plate close to the movable plate.

[0012] Furthermore, the part where the connecting rod contacts the movable plate is set as a threaded rod, a clamping block is provided at the position where the movable plate and the connecting rod are connected, the movable plate is threadedly connected to the threaded rod on the connecting rod through the clamping block, the connecting rod is rotatably connected to the movable plate, a thrust spring is provided between the turntable and the movable plate, a push plate is provided at one end of the thrust spring close to the turntable, and the push plate is rotatably connected to the turntable.

[0013] Furthermore, a sliding rod parallel to the lower end surface of the connecting member is provided inside the mounting frame, a limiting slider is provided at the lower end of the connecting member and close to the sliding rod, the limiting slider is sleeved on the sliding rod, and the limiting slider is slidably connected to the sliding rod.

[0014] Compared with the known public technologies, the technical solution provided by this application has the following beneficial effects: 1. The present application sets a traction mechanism, uses a driving motor to control the rotation of the screw, and then the hole to the traction cable moves smoothly, so that the inclination angle of the pouring basin changes evenly, and a deceleration component is set on the outside of the pouring basin. When the pouring basin tilts downward too fast, the inclination speed of the pouring basin can be effectively reduced, so that the pouring basin tends to a stable state, and the possibility of molten steel inside the pouring basin being spilled to the outside due to the excessive inclination angle of the pouring basin is reduced, thereby improving the safety of the centrifugal casting machine; 2. The present application sets a pneumatic assembly, uses a traction spring to pull the movable plate, and introduces the gas in the air chamber into the pneumatic telescopic rod of the deceleration assembly through the air pipe, thereby providing a sufficient and continuous power source for the deceleration assembly, and uses high-speed airflow to push the friction plate to squeeze the plug-in rod, thereby effectively improving the deceleration effect of the deceleration assembly and the corresponding speed of the deceleration assembly; 3. The present application sets a magnetic attraction part and uses a connecting rod to control the rotation of the second magnet on the surface of the turntable. When the traction spring becomes weak, the magnetic force of the first magnet and the second magnet is used to provide secondary power for the movement of the movable plate, thereby ensuring the moving speed of the movable plate and the speed at which the gas inside the air chamber passes into the gas gathering hood. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure in an embodiment of the present application; Figure 2This is a schematic diagram of the structure of the housing in the embodiment of the present application; Figure 3 This is a schematic diagram of the structure of the traction mechanism in the embodiment of the present application; Figure 4 This is a schematic diagram of the structure of the pneumatic component in the embodiment of the present application; Figure 5 This is a schematic diagram of the structure of the gas collecting hood in the embodiment of the present application; Figure 6 This is a schematic diagram of the structure of the magnetic attraction portion in the embodiment of the present application; Figure 7 This is a schematic diagram of the structure of the connecting rod in the embodiment of the present application; Figure 8 This is a schematic diagram of the structure of the deceleration assembly in the embodiment of the present application; Fig. 9 This is a schematic diagram of the installation of the clamping part in the embodiment of the present application; Fig.10 It is a schematic structural diagram of the clamping part in the embodiment of the present application.

[0016] In the figure: 1, truss; 2, centrifuge; 31, shell; 32, connecting frame; 33, pouring basin; 331, plug rod; 332, rolling bearing; 333, first convex block; 4, traction mechanism; 41, mounting frame; 42, driving motor; 43, screw rod; 44, collar; 45, limit slider; 46, slide rod; 47, auxiliary rod; 48, traction cable; 49, connecting piece; 5, pneumatic assembly; 51, air chamber; 52, movable plate; 521, auxiliary rope; 53, side plate; 531, air hole; 54, traction Lead spring; 55, gas hood; 56, double-tube air nozzle; 57, magnetic attraction part; 571, connecting rod; 572, first magnet; 573, second magnet; 574, turntable; 575, block; 576, propulsion spring; 577, push plate; 6, deceleration assembly; 61, mounting shell; 62, clamping part; 621, fixing plate; 622, connecting spring leaf; 623, fixing block; 624, friction plate; 625, second protrusion; 63, pneumatic telescopic rod; 64, ventilation pipe; 65, adapter; 66, end cover. DETAILED DESCRIPTION

[0017] In order to better understand the above technical solution, Figure 1-10 And specific implementation methods are used to describe the above technical solutions in detail.

[0018] refer to Figure 1 , Figure 2 , Figure 3 , Figure 8 and Fig. 9The present application discloses a centrifugal casting machine for manufacturing a ship stern shaft, including a truss 1, a centrifuge 2, a shell 31, a connecting frame 32, a pouring basin 33, a plug rod 331, a rolling bearing 332 and a traction mechanism 4. The centrifuge 2 is placed inside the truss 1. The shell 31 with a built-in drive unit is installed at the upper end of the truss 1, and the shell 31 moves at the upper end of the truss 1 through the internal drive unit. The connecting frame 32 is fixedly installed at the lower end of the shell 31. The plug rod 331 is fixedly installed on both sides of the pouring basin 33, and the plug rod 331 is plugged into the connecting frame 32, and the pouring basin 33 is connected to the connecting frame 32 through the plug rod 331. The rolling bearing 332 is sleeved on the plug rod 331, and the plug rod 331 is rotatably connected to the connecting frame 32 through the rolling bearing 332. The traction mechanism 4 is installed between the pouring basin 33 and the shell 31, and is used to achieve a smooth tilting of the pouring basin 33.

[0019] The driving unit inside the shell 31 controls the horizontal displacement of the connecting frame 32 and the pouring basin 33 on the truss 1. After the pouring basin 33 moves above the pouring port of the centrifuge 2, the traction mechanism 4 controls the tilting of the pouring basin 33 to pour the molten steel inside the pouring basin 33 into the centrifuge 2, thereby realizing the centrifugal casting of the stern shaft of the ship.

[0020] refer to Figure 2 , Figure 3 , Figure 8 and Fig. 9The traction mechanism 4 includes a mounting frame 41, a driving motor 42, a screw 43, a collar 44, a limit slider 45, a slide bar 46, an auxiliary rod 47, a traction cable 48, a connector 49, a pneumatic assembly 5 and a reduction assembly 6. The mounting frame 41 is fixedly mounted inside the housing 31. The driving motor 42 is fixedly mounted on the mounting frame 41. The screw 43 is fixedly mounted on the output shaft of the driving motor 42, and the other end of the screw 43 is plugged into the mounting frame 41 and is rotatably connected to the mounting frame 41. The collar 44 is sleeved on the screw 43, and the collar 44 is rotatably connected to the screw 43. The connector 49 is fixedly mounted on the lower end of the collar 44, and the connector 49 moves horizontally in the housing 31 through the rotational connection between the collar 44 and the screw 43. The limit slider 45 is fixedly mounted on the lower end of the connector 49. The slide bar 46 is fixedly installed inside the mounting frame 41 and near the position of the connecting member 49. The slide bar 46 and the screw rod 43 are parallel to each other, and the limit slider 45 is sleeved on the slide bar 46. The connecting member 49 is slidably connected to the slide bar 46 through the limit slider 45. The traction cable 48 is installed at one end of the connecting member 49. The auxiliary rod 47 is fixedly installed inside the mounting frame 41 and near the position of the traction cable 48, and the auxiliary rod 47 and the traction cable 48 are perpendicular to each other. The auxiliary rod 47 and the position near the traction cable 48 are provided with limit discs symmetrically distributed about the traction cable 48, and the traction cable 48 is located between the two limit discs. The speed reduction assembly 6 is installed outside the connecting frame 32 and near the plug rod 331, and is used to reduce the rotation speed of the plug rod 331 outside the pouring basin 33 inside the connecting frame 32. The pneumatic assembly 5 is installed inside the connecting member 49, and the speed reduction assembly 6 is connected to the pneumatic assembly 5 through an air pipe to provide the power required for the normal operation of the speed reduction assembly 6.

[0021] When the pouring basin 33 is ready to pour molten steel, the drive motor 42 is started, and the output shaft of the drive motor 42 rotates to rotate the screw 43. Since the collar 44 at the upper end of the connecting member 49 is rotatably connected to the screw 43 through a thread, and the limit slider 45 at the lower end of the connecting member 49 is sleeved on the slide bar 46, when the screw 43 rotates, the collar 44 drives the connecting member 49 to translate on the screw 43 along the length direction of the screw 43. During the translation of the connecting member 49, the traction cable 48 connected to the connecting member 49 is pulled, so that the end of the traction cable 48 connected to the connecting member 49 follows the translation of the connecting member 49, and the traction cable 48 is also pulled. One end of 48 connected to the bottom of the pouring basin 33 moves upward. During the traction process of the traction cable 48, the pouring basin 33 rotates with the connection between the plug rod 331 and the connecting frame 32 as the fulcrum. With the traction of the traction cable 48, the inclination angle of the pouring basin 33 increases at a uniform speed, reducing the shaking phenomenon of the pouring basin 33 during the tilting process. The molten steel inside the pouring basin 33 is continuously and evenly added to the casting mold of the centrifuge 2. When the traction cable 48 fails and breaks, the pneumatic component 5 supplies energy to the deceleration component 6, and uses the deceleration component 6 to reduce the downward rotation speed of the pouring basin 33, thereby reducing the shaking amplitude of the pouring basin 33.

[0022] refer to Figures 2 to 8The pneumatic assembly 5 includes an air chamber 51, a movable plate 52, an auxiliary rope 521, a side plate 53, a traction spring 54, a gas collecting cover 55, a double-tube air nozzle 56 and a magnetic attraction part 57. The air chamber 51 is opened inside the connecting member 49. The movable plate 52 is installed inside the connecting member 49, and the movable plate 52 is slidably connected to the connecting member 49. The side plate 53 is fixedly installed inside the connecting member 49 and away from the movable plate 52. The magnetic attraction part 57 is installed inside the connecting member 49, and the magnetic attraction part 57 is located between the movable plate 52 and the side plate 53. The magnetic attraction part 57 includes a connecting rod 571, a first magnet 572, a second magnet 573, a rotating disk 574, a block 575, a propulsion spring 576 and a push plate 577. The connecting rod 571 is plugged into the movable plate 52, and the position where the connecting rod 571 is connected to the movable plate 52 is set as a threaded rod. The block 575 is fixedly mounted at the position where the movable plate 52 is connected to the connecting rod 571, and the movable plate 52 is connected to the threaded surface of the connecting rod 571 through the block 575. One end of the connecting rod 571 penetrates the movable plate 52 and is inserted into the air chamber 51, and the turntable 574 is fixedly mounted on one end of the connecting rod 571 located in the air chamber 51. The propulsion spring 576 is installed between the movable plate 52 and the turntable 574, and the push plate 577 is fixedly mounted on one end of the propulsion spring 576 close to the turntable 574, and the push plate 577 is rotatably connected to the turntable 574. A plurality of first magnets 572 are fixedly mounted on the inner surface of the side plate 53 and close to the center, and the plurality of first magnets 572 are evenly distributed along the circumference of the turntable 574. The second magnet 573 is fixedly mounted on the surface of the turntable 574, and the plurality of second magnets 573 are evenly distributed along the circumference of the turntable 574. The first magnet 572 and the second magnet 573 are arranged opposite to each other, and the first magnet 572 on the surface of the side plate 53 and the second magnet 573 on the surface of the turntable 574 attract each other. When the traction cable 48 pulls the movable plate 52, the connecting rod 571 connected to the traction cable 48 is pulled, and the propulsion spring 576 between the movable plate 52 and the turntable 574 is compressed. At this time, the second magnet 573 on the surface of the turntable 574 and the first magnet 572 on the surface of the side plate 53 are staggered, and the magnetic force between the first magnet 572 and the second magnet 573 is weakened. A plurality of auxiliary ropes 521 are fixedly installed on the side surface of the movable plate 52 close to the traction cable 48, and one end of the auxiliary rope 521 is fixedly connected to the traction cable 48. The plurality of auxiliary ropes 521 are distributed at the edge of the movable plate 52, so that when the movable plate 52 is pulled by the traction cable 48, it is always in a state perpendicular to the inner wall of the connecting member 49, so as to ensure the stability of the movement of the movable plate 52. The gas hood 55 is fixedly mounted on a side surface of the side plate 53 away from the gas chamber 51. The surface of the side plate 53 is provided with gas holes 531 for gas circulation, and the gas holes 531 are located on the inner side of the gas hood 55. The diameter of the opening of one end of the gas hood 55 connected to the side plate 53 is larger than the diameter of the opening of the other end of the gas hood 55.The double-tube air nozzle 56 is fixedly mounted at the end with the smaller opening of the air collecting hood 55, and two air pipes are mounted on the double-tube air nozzle 56, and the two air pipes are symmetrically distributed about the connecting piece 49. One of the air pipes is connected to the deceleration component 6 on one side of the pouring basin 33, and the other air pipe is connected to the deceleration component 6 on the other side of the pouring basin 33.

[0023] When the traction cable 48 is disconnected, the movable plate 52 loses the traction force of the traction cable 48, and the movable plate 52 will move quickly in the direction of the side plate 53 under the action of the elastic potential energy of the traction spring 54. At the same time, the connecting rod 571 also loses the traction force in the direction of the traction cable 48, and the propulsion spring 576 recovers its original length under the action of its elastic potential energy, pushing the turntable 574 away from the movable plate 52. Since the position where the connecting rod 571 is connected to the movable plate 52 is set as a threaded rod and is threadedly connected to the movable plate 52, the connecting rod 571 rotates during the movement, and the rotation of the connecting rod 571 drives the turntable 574 to rotate, and the second magnet 573 on the surface of the turntable 574 rotates with the turntable 574 to the same arrangement state as the first magnet 572 on the surface of the side plate 53. At the end of the travel of the movable plate 52, the first magnet 572 and the second magnet 573 attract each other, and the traction force generated by the magnetic attraction ensures the speed of the movable plate 52. As the movable plate 52 moves rapidly toward the side plate 53 under the action of the traction spring 54 and the magnetic attraction portion 57, during the movement, the movable plate 52 pushes the gas inside the air chamber 51 toward the side plate 53, and squeezes the gas in the air chamber 51 into the gas collecting hood 55. After the gas passes through the air holes 531 on the surface of the side plate 53 and enters the gas collecting hood 55, since the opening at the air outlet end of the gas collecting hood 55 is much smaller than the opening at the air inlet end of the gas collecting hood 55, the gas inside the double-tube air nozzle 56 has a large flow rate, and the high-speed airflow is passed into the deceleration component 6 through the air pipe, providing the deceleration component 6 with kinetic energy for reducing the rotation speed of the pouring basin 33.

[0024] refer to Figure 2 , Figure 8 , Fig. 9 and Fig.10The speed reduction assembly 6 includes a mounting shell 61, a clamping portion 62, a pneumatic telescopic rod 63, a vent pipe 64, an adapter 65 and an end cover 66. The mounting shell 61 is fixedly mounted on the outside of the connecting frame 32 and close to the plug-in rod 331, and one end of the plug-in rod 331 passes through the connecting frame 32 and is plugged into the inside of the mounting shell 61. The end cover 66 is fixedly mounted on the inside of the mounting shell 61 and close to the plug-in rod 331. A bearing connected to the plug-in rod 331 is provided inside the end cover 66, and the plug-in rod 331 is plugged into the end cover 66. The adapter 65 is fixedly mounted on the side surface of the end cover 66 away from the plug-in rod 331. Multiple vent pipes 64 are plugged into the adapter 65, and the multiple vent pipes 64 are evenly distributed along the circumference of the adapter 65. A connecting pipe communicating with the air pipe of the pneumatic assembly 5 is provided on one side surface of the adapter 65 close to the inner wall of the mounting shell 61. The air pipe inside the pneumatic assembly 5 is connected to the adapter 65, and the air pipe is communicated with the vent pipe 64 through the adapter 65. The pneumatic telescopic rod 63 is fixedly mounted on one end of the vent pipe 64 away from the adapter 65, and one end of the pneumatic telescopic rod 63 connected to the vent pipe 64 is fixedly mounted on the inner wall of the mounting shell 61. The clamping part 62 is installed inside the mounting shell 61 and close to the plug rod 331. The clamping part 62 includes a fixing plate 621, a connecting spring 622, a fixing block 623, a friction plate 624, a first protrusion 333 and a second protrusion 625. A plurality of arc-shaped fixing plates 621 are fixedly mounted on the inner wall of the mounting housing 61, and the plurality of fixing plates 621 are evenly distributed along the circumference of the plug-in rod 331, and a connecting spring 622 is fixedly mounted on one side of the fixing plate 621, one end of the connecting spring 622 is fixedly connected to the fixing plate 621, and the other end of the connecting spring 622 faces another fixing plate 621 but is not connected thereto. The plurality of connecting springs 622 and the plurality of fixing plates 621 are alternately arranged and enclosed in an annular structure. The fixing block 623 is fixedly mounted on a side surface of the connecting spring 622 away from the plug-in rod 331, and the fixing block 623 is fixedly connected to the traveling end of the pneumatic telescopic rod 63. The friction plate 624 is fixedly mounted on the other side surface of the connecting spring 622. The second protrusion 625 is fixedly mounted on a side surface of the friction plate 624 close to the plug-in rod 331. The first protrusion 333 is fixedly mounted on the outside of the plug rod 331 and close to the second protrusion 625 , and any rib of the first protrusion 333 is parallel to any rib of the second protrusion 625 . The length direction of the first protrusion 333 is perpendicular to the length direction of the friction plate 624 .

[0025] The double-tube air nozzle 56 directs high-speed air flow into the adapter 65 inside the mounting housing 61 through the air pipe, and then into the pneumatic telescopic rod 63 through the air pipe 64 at the end of the adapter 65. The air flow pushes out the traveling end of the pneumatic telescopic rod 63, and the traveling end after being pushed out pushes the fixed block 623, so that the fixed block 623 moves toward the position of the plug-in rod 331. At this time, the connecting spring 622 fixedly connected to the fixed block 623 bends. Since one end of the connecting spring 622 is fixedly connected to the fixing plate 621, the end of the connecting spring 622 fixedly connected to the fixing plate 621 will bend toward the position of the plug-in rod 331, and at the same time, the friction plate 624 on the surface of the connecting spring 622 is pushed to contact with the plug-in rod 331. The second protrusion 625 on the surface of the friction plate 624 and the first protrusion 333 on the surface of the plug rod 331 generate a sliding friction force, which slows down the rotation of the pouring basin 33. Since one end of the connecting spring 622 is fixedly connected to the fixed plate 621, when the pouring basin 33 rotates, the plug rod 331 rotates from the position of the fixed plate 621 to the position of the connecting spring 622 in the mounting shell 61. The friction plate 624 on the surface of the connecting spring 622 and the outer wall of the plug rod 331 are divided into two states: tight and tangent. This effectively reduces the possibility that during the rotation of the plug rod 331, one end of the connecting spring 622 is inserted into the first protrusion 333 on the surface of the plug rod 331, resulting in serious deformation of the connecting spring 622, and then the plug rod 331 and the connecting spring 622 are stuck.

[0026] The working principle of the embodiment of the present application is as follows: the driving motor 42 rotates the driving screw 43 to rotate, so that the connecting piece 49 translates on the sliding rod 46, and then controls the traction cable 48 to pull the pouring basin 33, so that the pouring basin 33 tilts at a uniform speed. When the traction cable 48 is disconnected, the movable plate 52 moves quickly to the position of the side plate 53 under the action of the traction spring 54. At the same time, the connecting rod 571 moves into the air chamber 51 under the action of the thrust spring 576, and rotates on the movable plate 52 during the movement, so that the second magnet 573 on the surface of the turntable 574 rotates to a position opposite to the first magnet 572. The magnetic force of the first magnet 572 and the second magnet 573 further increases the speed at which the movable plate 52 moves toward the side plate 53. The rapid movement of the movable plate 52 squeezes the gas in the air chamber 51 into the gas collecting cover 55. The gas forms a high-speed airflow through the gas collecting cover 55. The high-speed airflow passes through the air pipe into the vent pipe 64 at the end of the adapter 65, and causes the traveling end of the pneumatic telescopic rod 63 to be ejected quickly and continuously. The traveling end of the pneumatic telescopic rod 63 pushes the fixed block 623 toward the position of the plug rod 331, causing the connecting spring 622 to bend in the direction of the plug rod 331. When the friction plate 624 and the plug rod 331 are in contact, the connecting spring 622 is bent toward the plug rod 331. A sliding friction force is formed between the rods 331, and the sliding friction force between the friction plate 624 and the surface of the plug-in rod 331 reduces the rotation speed of the plug-in rod 331, so that the second protrusion 625 on the surface of the friction plate 624 contacts the first protrusion 333 on the surface of the plug-in rod 331, and the friction between the first protrusion 333 and the second protrusion 625 further increases the friction force between the friction plate 624 and the plug-in rod 331, thereby increasing the deceleration effect of the deceleration assembly 6 on the plug-in rod 331 of the pouring basin 33, reducing the rotation speed of the plug-in rod 331, and thereby reducing the speed at which the pouring basin 33 rotates downward.

[0027] Although the embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A centrifugal casting machine for manufacturing a ship stern shaft, comprising a centrifuge (2), a truss (1), a housing (31) with a built-in drive unit, a connecting frame (32) and a pouring basin (33), characterized in that: It also includes a traction mechanism (4) disposed between the pouring basin (33) and the shell (31), The traction mechanism (4) comprises a mounting frame (41) fixed inside the housing (31), a driving motor (42) being provided on the mounting frame (41), a screw (43) being provided at the output end of the driving motor (42), a collar (44) matching the screw (43) being sleeved on the screw (43), the collar (44) sliding on the screw (43), a connecting piece (49) being provided at the lower end of the collar (44), a traction steel cable (48) being provided at one end of the connecting piece (49), an auxiliary rod (47) being provided inside the mounting frame (41), one end of the traction steel cable (48) being wound around the outside of the auxiliary rod (47) and connected to the lower end of the outer wall of the pouring basin (33), a plug-in rod (331) being provided at the position where the pouring basin (33) is connected to the connecting frame (32), and a speed reduction assembly (6) being provided at one end of the plug-in rod (331) penetrating through the connecting frame (32); The deceleration assembly (6) comprises a mounting shell (61) fixedly connected to the connecting plate, the plug-in rod (331) on the outer side of the pouring basin (33) penetrates the connecting frame (32) and is plugged into the mounting shell (61), a clamping portion (62) is provided inside the mounting shell (61), an end of the clamping portion (62) close to the mounting shell (61) is provided with a pneumatic telescopic rod (63), one end of the pneumatic telescopic rod (63) is provided with a vent pipe (64), one end of the vent pipe (64) is provided with an adapter (65), one side of the adapter (65) is provided with an end cover (66) matching the plug-in rod (331), the other side of the adapter (65) penetrates the mounting shell (61) and extends to the outside, the end of the connecting member (49) away from the traction steel cable (48) is provided with a pneumatic assembly (5), and the end of the adapter (65) penetrating the mounting shell (61) is connected to the pneumatic assembly (5) through the vent pipe.

2. A centrifugal casting machine for manufacturing a ship stern shaft according to claim 1, characterized in that: A rolling bearing (332) is provided at one end of the plug-in rod (331) that passes through the connecting frame (32); the rolling bearing (332) is sleeved on the plug-in rod (331) and fixedly connected to the connecting frame (32); the plug-in rod (331) is rotatably connected to the connecting frame (32) via the rolling bearing (332).

3. The centrifugal casting machine for manufacturing a ship stern shaft according to claim 1, characterized in that: The clamping portion (62) comprises a plurality of fixing plates (621) fixedly connected to the inner side wall of the mounting shell (61), the plurality of fixing plates (621) being evenly distributed along the circumference of the plug-in rod (331), an arc-shaped connecting spring (622) being provided at one end of the fixing plate (621), a fixing block (623) being provided on a surface of a side of the connecting spring (622) away from the plug-in rod (331), the upper end of the fixing block (623) being fixedly connected to the traveling end of the pneumatic telescopic rod (63), and a friction plate (624) being provided on the other side of the connecting spring (622) and close to the plug-in rod (331).

4. A centrifugal casting machine for manufacturing a ship stern shaft according to claim 3, characterized in that: The outer side of the plug rod (331) is provided with a plurality of first protrusions (333) evenly distributed along the circumference of the plug rod (331); a surface of the friction plate (624) on one side close to the plug rod (331) is provided with a plurality of second protrusions (625) having the same structure as the first protrusions (333); the first protrusions (333) and the second protrusions (625) are parallel to each other.

5. The centrifugal casting machine for manufacturing a ship stern shaft according to claim 1, characterized in that: The pneumatic assembly (5) comprises a double-tube air nozzle (56) connected to the adapter (65), one end of the double-tube air nozzle (56) is provided with an air collecting hood (55), one end of the air collecting hood (55) is provided with a side plate (53), a surface of the side plate (53) is provided with a plurality of air holes (531), one end of the side plate (53) is provided with a pneumatic housing, the pneumatic housing is fixedly connected to the collar (44) on the screw rod (43), and the interior of the pneumatic housing is provided with a movable plate (53) slidably connected to the pneumatic housing. 2), an air chamber (51) is provided inside the pneumatic housing, the air chamber (51) is located between the movable plate (52) and the side plate (53), a plurality of auxiliary ropes (521) are provided on a surface of the movable plate (52) close to the traction steel cable (48), one end of the auxiliary rope (521) is fixedly connected to the traction steel cable (48), and the other end of the auxiliary rope (521) is fixedly connected to the movable plate (52), and a traction spring (54) is provided between the side plate (53) and the movable plate (52).

6. A centrifugal casting machine for manufacturing a ship stern shaft according to claim 5, characterized in that: One end of the traction steel cable (48) connected to the auxiliary rope (521) is provided with a magnetic attraction portion (57), and the magnetic attraction portion (57) includes a connecting rod (571) fixedly connected to the traction steel cable (48), one end of the connecting rod (571) is inserted into the interior of the mounting shell (61), and the end of the connecting rod (571) inserted into the mounting shell (61) passes through the movable plate (52), and one end of the connecting rod (571) located inside the mounting shell (61) is provided with a turntable (574), and a surface of the turntable (574) is provided with a plurality of second magnets (573) uniformly distributed along the circumference of the turntable (574), and a first magnet (572) attracted to the second magnet (573) is provided at a central position of a side surface of the side plate (53) close to the movable plate (52).

7. The centrifugal casting machine for manufacturing a ship stern shaft according to claim 6, characterized in that: The portion of the connecting rod (571) that contacts the movable plate (52) is configured as a threaded rod; a clamping block (575) is provided at a position where the movable plate (52) and the connecting rod (571) are connected; the movable plate (52) is threadedly connected to the threaded rod on the connecting rod (571) via the clamping block (575); the connecting rod (571) is rotatably connected to the movable plate (52); a propulsion spring (576) is provided between the rotating disk (574) and the movable plate (52); a push plate (577) is provided at one end of the propulsion spring (576) close to the rotating disk (574); and the push plate (577) is rotatably connected to the rotating disk (574).

8. The centrifugal casting machine for manufacturing a ship stern shaft according to claim 1, characterized in that: A slide bar (46) parallel to the lower end surface of the connecting member (49) is provided inside the mounting frame (41); a limit slider (45) is provided at the lower end of the connecting member (49) and close to the slide bar (46); the limit slider (45) is sleeved on the slide bar (46); and the limit slider (45) is slidably connected to the slide bar (46).

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