A core shooter for coated sand castings

Abstract

The application belongs to the field of core shooting machines, in particular to a kind of foundry coated sand core shooting machine, including frame, movable die assembly, fixed die assembly, sand shooting assembly, sand supply assembly, and the fixed die assembly includes upper die;The upper die and frame are in fixed connection;The upper die top is provided with sand inlet, and bottom is provided with forming chamber;The inner wall of the upper die is provided with exhaust air duct;The bottom of the exhaust air duct is provided with a plurality of first exhaust ports, and the first exhaust port is in communication with the forming chamber;Through the cooperation of first exhaust port, exhaust air duct and second exhaust port, the forming cavity of upper die and bottom die can be exhausted, to reduce the loosening of sand particles in the cavity caused by gas, improve the density and smoothness of the surface of the formed sand core, and at the same time, through the setting of the protrusion, the escape speed of the gas in the exhaust air duct can be accelerated, thereby ensuring the exhaust effect of the device.

Description

TECHNICAL FIELD

[0001] The application relates to the field of core shooting machines, and particularly relates to a foundry coated sand core shooting machine. BACKGROUND

[0002] The core shooting machine is a special equipment for manufacturing sand cores in the foundry industry, and the core sand is rapidly solidified and formed by spraying the core sand into the cavity of a mold through a special sand hopper using compressed air. The core shooting machine is divided into hot core box and cold core box types, is suitable for complex mold production, can produce high-precision sand cores, and is widely applied to the foundry field of automobile accessories.

[0003] In the prior art, there are innovations of core shooting machines. For example, a Chinese patent with the publication number CN116352029B discloses an automobile foundry coated sand core shooting machine. The technology uses magnetic attraction to make the magnetic block and the magnetic slide plate attract each other. When the fixed mold and the movable mold are heated, the magnetic attraction between the magnetic slide plate and the magnetic block decreases, so that the magnetic slide plate is moved under the action of the tension spring I to press the gas in the movable cavity into the gas cavity. Finally, the gas acts on the coated sand on the top of the forming groove, loosens the un-solidified coated sand, and improves the efficiency of pouring the coated sand.

[0004] In the prior art, the gas brought in by the core shooting machine during sand shooting mainly depends on the gap between the ejector pin and the mold as the exhaust passage. The gas can be discharged through the small gap between the ejector pin and the mold. In use and observation, it is found that this exhaust method is limited by the gap of the ejector pin, resulting in limited exhaust area and exhaust volume, which is difficult to meet the actual exhaust demand.

[0005] Therefore, the application provides a foundry coated sand core shooting machine. SUMMARY

[0006] In order to make up for the deficiencies of the prior art and solve at least one technical problem in the background art.

[0007] The technical scheme adopted by the present application to solve its technical problems is: a kind of foundry coated sand shooting core machine, including rack, movable die assembly, fixed die assembly, sand shooting assembly, sand supply assembly, fixed die assembly includes upper die;The upper die and the rack are in fixed connection;The upper die top is equipped with sand inlet, and bottom is equipped with forming chamber;Exhaust air duct is opened in the inner wall of the upper die;Multiple first exhaust ports are opened in the bottom of the exhaust air duct, and the first exhaust port is in communication with the forming chamber;Multiple second exhaust ports are opened in the sidewall of the exhaust air duct;Multiple pairs of lugs are fixedly connected to the inner wall of the exhaust air duct;The lug is located between the first exhaust port and the second exhaust port;Movable die assembly includes first guide rail;Third air cylinder is fixedly connected to one side of the first guide rail, and second sliding plate is fixedly connected to the output end of the third air cylinder;The second sliding plate and the first guide rail are slidingly connected;Fourth air cylinder is fixedly connected to the bottom of the second sliding plate;Bottom die is fixedly connected to the output end of the fourth air cylinder, and parting surface is provided on the bottom die;Sand shooting assembly includes first sliding plate;The first sliding plate and the rack are slidingly connected;First air cylinder is fixedly connected to one side of the rack;The output end of the first air cylinder is fixedly connected with the first sliding plate;Second air cylinder is fixedly connected to the top of the first sliding plate;Sand shooter is fixedly connected to the output end of the second air cylinder;Multiple telescopic rods are fixedly connected between the sand shooter and the first sliding plate;Multiple air inlet pipes are communicated in the middle of the sand shooter, and sand shooting head is provided at the bottom of the sand shooter;Sand supply assembly is communicated with sand shooter through pipeline, and is used for conveying coated sand in the sand shooter;Through the cooperation of the first exhaust port, the exhaust air duct and the second exhaust port, the forming cavity of the upper die and the bottom die can be exhausted, so as to reduce the loosening of the sand particles in the cavity caused by gas, improve the density and smoothness of the sand core surface after forming, and accelerate the escape speed of the gas in the exhaust air duct through the setting of the lug, thereby ensuring the exhaust effect of the device.

[0008] Preferably, a pair of rotating rods are rotatably connected to the inner wall of the exhaust air duct, and the pair of rotating rods are symmetrically distributed;Turbine is fixedly connected to the outer wall of the rotating rod;The turbine is located above the first exhaust port, and the first exhaust port is arranged along the tangent direction of the turbine;At least one cam is fixedly connected to the outer wall of the rotating rod;Vibration rod is provided on one side of the cam, and the vibration rod is rotatably connected with the exhaust air duct;Second guide rail is symmetrically provided on both sides of the vibration rod;Half-arc sliding groove is opened on the surface of the second guide rail, and the both ends of the vibration rod are slidingly matched with the sliding groove on the surface of the second guide rail;Knocking part is fixedly connected to the end of the vibration rod;Through the cooperation of the cam and the vibration rod, the cam can rotate under the action of gas and make the vibration rod knock the exhaust air duct, so as to apply vibration effect to the sand particles in the forming cavity, and assist the redistribution of the sand particles.

[0009] Preferably, one side of the second guide rail is provided with a resistance plate, the surface of the resistance plate is provided with a friction surface, and the cross section of the friction surface is arranged in a decreasing manner from bottom to top; the resistance plate is in contact with the end of the vibration rod; by arranging the resistance plate, the contact area between the vibration rod and the surface friction surface of the resistance plate can increase linearly when the vibration rod is reset during reciprocating movement, so that the resistance received by the vibration rod when it moves downward also increases, which can slow down the vibration rod, thereby reducing the speed of the vibration rod when it contacts the inner wall of the sliding groove on the surface of the second guide rail, reducing the damage caused by the collision between the vibration rod and the second guide rail, and when the vibration rod moves upward, it can overcome the static friction between the vibration rod and the resistance plate under the impact of the cam, and the friction area between the vibration rod and the resistance plate decreases linearly during subsequent upward movement, so as to reduce the influence of the resistance on the exhaust air duct before the vibration rod hits the exhaust air duct.

[0010] Preferably, the top of the upper die is provided with a plurality of ball seats, and the ball seats are in communication with the exhaust air duct; a plurality of exhaust cylinders are fixedly connected to the top of the upper die; a first spring is fixedly connected to the inner wall of the exhaust cylinder; a first ball is fixedly connected to the bottom of the first spring, and the first ball is correspondingly arranged with the ball seat; the outer wall of the exhaust cylinder is provided with a plurality of holes; when the exhaust air duct is used to exhaust the forming cavity, the inside of the exhaust air duct will be in a positive pressure state, and when the pressure is large enough, the first ball will be pushed out of the ball seat under the action of the gas pressure, and the first spring will be in a compressed state. At this time, the exhaust air duct and the external flow path can be newly provided with the exhaust cylinder, that is, part of the gas can be discharged outward through the surface holes of the exhaust cylinder, so as to improve the bearing capacity of the device during exhaust, and ensure that the gas in the forming cavity can be discharged in time.

[0011] Preferably, the top of the first ball is fixedly connected with a vertical rod; the outer wall of the exhaust cylinder is provided with a sealing cover, and the sealing cover is rotatably connected with the upper die; a third guide rail is fixedly connected to the inner wall of the sealing cover, and the end of the vertical rod is slidably connected with the third guide rail; the outer wall of the sealing cover is provided with a plurality of holes; when the exhaust air duct is not used for exhaust, the holes on the surface of the sealing cover and the holes on the outer wall of the exhaust cylinder are arranged in an interleaved manner, that is, the sealing cover blocks the surface holes of the exhaust cylinder, so that the inside of the exhaust cylinder can be a closed environment, so as to isolate the exhaust cylinder and its internal components from the external environment. When the sand shooter is reset under the driving action of the first air cylinder, the sand particles on the bottom of the sand shooter may overflow, at which time the sealing cover can block these sand particles and impurities, so as to reduce the pollution of the internal components of the exhaust cylinder.

[0012] Preferably, the first spherical bottom is provided with a hole, and the first spherical ball is in communication with the ball seat; the first spherical ball is internally provided with a second spherical ball; the upper half of the first spherical ball is fixedly connected with a plurality of fixed blocks; when the air pressure in the exhaust air duct is large enough, part of the gas can enter the interior of the first spherical ball through the hole in the bottom of the first spherical ball, so that the first spherical ball can be lifted up under the action of the air pressure, and the second spherical ball in the interior of the first spherical ball can be irregularly moved under the action of the turbulent airflow in the interior thereof, the second spherical ball will continuously collide with the fixed blocks in the movement process to generate a vibration effect, and the vibration can be further transmitted to the forming cavity between the upper die and the bottom die, so as to further accelerate the redistribution of the sand particles in the interior of the forming cavity.

[0013] Preferably, the bottom of the second sliding plate is fixedly connected with a fixed plate; a plurality of ejectors are provided on the surface of the fixed plate and are fixedly connected; the ejectors are in through arrangement and are in sliding connection with the bottom die; one end of the ejector is provided with a plurality of holes, and the other end is provided with a hollow structure; when the sand shooter shoots sand, the end of the ejector is flush with the parting surface of the first sliding plate, and since the end of the ejector is provided with a plurality of holes, the sand particles can be intercepted, and the gas in the bottom of the forming cavity can be discharged to the outside through the ejector, and the auxiliary device can be used for exhaust, and when the mold is disassembled, the fourth air cylinder resets the bottom die, and the ejector is in a static state, so that the sand core can be supported by the ejector and taken out of the bottom die, thereby realizing automatic demolding of the sand core and facilitating subsequent taking out of the sand core.

[0014] Preferably, the inner wall of the ejector is fixedly connected with a second spring; the end of the second spring is fixedly connected with a bottom plate; the side close to the second spring of the bottom plate is fixedly connected with a top plate; a plurality of cleaning rods are fixedly connected to one side of the top plate, and the cleaning rods are in corresponding arrangement with the holes in the end of the ejector; when there is gas in the bottom of the forming cavity, the gas can extrude the cleaning rods under the action of the positive pressure, so that the assembly composed of the bottom plate, the top plate and the cleaning rods moves and the second spring is in a stretched state, at this time, the gas can be discharged from the gap between the bottom plate and the ejector, and when the exhaust stops, the bottom plate and the top plate will reset under the action of the elastic force of the second spring and make the cleaning rods inserted into the side of the ejector and dredge the holes in the side of the ejector.

[0015] Preferably, the sand supply assembly comprises a tank body; the tank body is fixedly installed on the top of the frame; the top of the tank body is fixedly connected with a cover plate; a screen is fixedly connected between the cover plate and the tank body; a motor is fixedly connected on the top of the cover plate; a rotating shaft is fixedly connected at the output end of the motor; the rotating shaft is penetratingly arranged in the cover plate and is rotationally connected with the cover plate; a plurality of stirring blades are fixedly connected on the outer wall of the rotating shaft, and the surfaces of the stirring blades are serrated; the opening between the top of the tank body and the cover plate is used for lifting and feeding by the auger conveyor, and the screen can intercept large materials in the raw materials; when the sand supply assembly supplies the sand shooter, the on-off valve at the bottom of the tank body can be opened and the coated sand can be pumped into the sand shooter, and when the tank body stores the coated sand, the motor can be started to drive the rotating shaft to rotate, the rotating shaft can drive the stirring blades to rotate, the surfaces of the stirring blades are serrated, the powder in the tank body can be cut and broken, and the loose degree of the coated sand in the tank body can be improved, so that the quality of the subsequent sand shooting is improved.

[0016] Preferably, the outer wall of the rotating shaft is fixedly connected with a beating plate, and the beating plate is correspondingly arranged with the screen; by arranging the beating plate, the large materials in the screen can be beaten and crushed when the rotating shaft rotates, so that the materials accumulated in the screen can be reduced, and the utilization rate of the device for the materials can be improved.

[0017] The present application has the advantages of:

[0018] 1. The coated sand core shooter for castings, through the cooperation of the first exhaust port, the exhaust air duct and the second exhaust port, the forming cavity of the upper mold and the bottom mold can be exhausted to reduce the loose condition of the sand particles in the cavity caused by gas, improve the density and smoothness of the surface of the sand core after forming, and through the arrangement of the protrusion, the escape speed of the gas in the exhaust air duct can be accelerated, so that the exhaust effect of the device is ensured.

[0019] 2. The coated sand core shooter for castings, through the cooperation of the cam and the vibration rod, the cam can rotate under the action of the gas and make the vibration rod knock the exhaust air duct to apply a vibration effect to the sand particles in the forming cavity to assist the redistribution of the sand particles. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0021] Figure 1 The main body of the present application is shown in the figure;

[0022] Figure 2Structure diagram of the frame in the present application;

[0023] Figure 3 Structure diagram of the upper die in the present application;

[0024] Figure 4 Structure diagram of the exhaust air duct in the present application;

[0025] Figure 5 Structure diagram of the vibration rod in the present application;

[0026] Figure 6 Structure diagram of the exhaust cylinder in the present application;

[0027] Figure 7 Structure diagram of the first guide rail in the present application;

[0028] Figure 8 Structure diagram of the bottom die in the present application;

[0029] Figure 9 Structure diagram of the ejector pin in the present application;

[0030] Figure 10 Structure diagram of the sand shooter in the present application;

[0031] Figure 11 Structure diagram of the tank in the present application.

[0032] In the figure: 1, frame; 12, first sliding plate; 13, telescopic rod; 14, sand shooter; 15, air inlet pipe; 16, first air cylinder; 161, second air cylinder; 17, upper die; 18, first guide rail; 19, third air cylinder; 110, second sliding plate; 111, fourth air cylinder; 112, bottom die; 113, first exhaust port; 114, exhaust air duct; 115, second exhaust port; 116, protruding block; 2, rotating rod; 22, turbine; 23, cam; 24, vibration rod; 25, second guide rail; 3, resistance plate; 4, exhaust cylinder; 42, first spring; 43, first ball; 5, vertical rod; 52, sealing cover; 53, third guide rail; 6, second ball; 62, fixed block; 7, fixed plate; 72, ejector pin; 8, bottom plate; 82, second spring; 83, top plate; 84, cleaning rod; 9, tank; 92, cover plate; 93, motor; 94, rotating shaft; 95, screen; 96, stirring blade; 10, beating plate. DETAILED DESCRIPTION

[0033] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0034] The specific embodiments are given below.

[0035] Please refer to Figures 1 to 11 As shown in the drawings, the core shooting machine for casting film-coated sand comprises a rack 1, a movable mold assembly, a fixed mold assembly, a sand shooting assembly, a sand supply assembly, the fixed mold assembly comprises an upper mold 17; the upper mold 17 and the rack 1 are in a fixed connection; the upper mold 17 is provided with a sand inlet at the top and a forming chamber at the bottom; an exhaust air duct 114 is formed in the inner wall of the upper mold 17; a plurality of first exhaust ports 113 are formed in the bottom of the exhaust air duct 114, and the first exhaust ports 113 are in communication with the forming chamber; a plurality of second exhaust ports 115 are formed in the sidewall of the exhaust air duct 114; a plurality of pairs of protrusions 116 are fixedly connected to the inner wall of the exhaust air duct 114; the protrusions 116 are located between the first exhaust ports 113 and the second exhaust ports 115; the movable mold assembly comprises a first guide rail 18; a third air cylinder 19 is fixedly connected to one side of the first guide rail 18, and a second sliding plate 110 is fixedly connected to the output end of the third air cylinder 19; the second sliding plate 110 and the first guide rail 18 are in sliding connection; a fourth air cylinder 111 is fixedly connected to the bottom of the second sliding plate 110; a bottom mold 112 is fixedly connected to the output end of the fourth air cylinder 111, and the bottom mold 112 is provided with a parting surface; the sand shooting assembly comprises a first sliding plate 12; the first sliding plate 12 and the rack 1 are in sliding connection; a first air cylinder 16 is fixedly connected to one side of the rack 1; the output end of the first air cylinder 16 is in fixed connection with the first sliding plate 12; a second air cylinder 161 is fixedly connected to the top of the first sliding plate 12; a sand shooter 14 is fixedly connected to the output end of the second air cylinder 161; a plurality of telescopic rods 13 are fixedly connected between the sand shooter 14 and the first sliding plate 12; a plurality of air inlets 15 are in communication with the middle of the sand shooter 14, and the sand shooter 14 is provided with a sand shooting head at the bottom; the sand supply assembly is in communication with the sand shooter 14 through a pipeline, and is used for conveying the film-coated sand in the sand shooter 14;

[0036] When working, the second sliding plate 110 can be driven to slide along the first guide rail 18 by starting the third cylinder 19 until the second sliding plate 110 with the bottom die 112 is directly below the upper die 17, then the fourth cylinder 111 can be started to push the bottom die 112 and make the bottom die 112 butt joint with the upper die 17, positioning pins can be arranged between the bottom die 112 and the upper die 17 for positioning connection, after the bottom die 112 and the upper die 17 butt joint, the first cylinder 16 can be started to drive the sand shooter 14 to approach the upper die 17 until the sand shooter 14 is directly above the upper die 17, then the second cylinder 161 can be started to push the sand shooter 14 to approach the top of the upper die 17 and make the sand shooting head at the bottom of the sand shooter 14 butt joint with the sand inlet at the top of the upper die 17, then the coated sand in the sand shooter 14 can be conveyed by the sand supply assembly, and the high-pressure air supply device connected at the end of the air inlet pipe 15, so that the coated sand can cooperate with the compressed air to perform core shooting, the electric heating structure can be arranged on the upper die 17 or the bottom die 112 to speed up the sand core forming speed, after the sand core is formed, the bottom die 112 and the sand shooter 14 can be reset in sequence by the first cylinder 16 and the fourth cylinder 111 respectively, finally the bottom die 112 can be reset by the third cylinder 19, and the sand core at the top of the bottom die 112 is taken out, the above principle is mature technology in the art, so the unmentioned part in the application can refer to the existing technology, and during the coated sand shooting process, the air mixed between the sand particles and the gas generated during the reaction when the sand core solidifies will accumulate inside the forming cavity between the upper die 17 and the bottom die 112, these gases can flow into the exhaust air duct 114 through the first exhaust port 113, and be discharged to the outside through the second exhaust port 115, at the same time, because a pair of protrusions 116 are arranged between the first exhaust port 113 and the second exhaust port 115, the gas flowing in the exhaust air duct 114 will accelerate due to the reduction of flow area, thereby accelerating the gas discharge in the exhaust air duct 114, it is worth mentioning that the inner wall of the first exhaust port 113 should be provided with filtering measures, specifically a filter screen, to reduce the situation that sand particles enter the exhaust air duct 114, which is not shown in the figure; through the cooperation of the first exhaust port 113, the exhaust air duct 114 and the second exhaust port 115, the forming cavity of the upper die 17 and the bottom die 112 can be exhausted to reduce the loosening of sand particles in the cavity due to gas, improve the density and smoothness of the surface of the formed sand core, and through the arrangement of the protrusions 116, the escape speed of the gas in the exhaust air duct 114 can be accelerated, thereby ensuring the exhaust effect of the device.

[0037] Please refer to Figures 3 to 5As shown, the inner wall of the exhaust air duct 114 is rotatably connected with a pair of rotating rods 2, and the pair of rotating rods 2 are symmetrically distributed; the outer wall of the rotating rod 2 is fixedly connected with a turbine 22; the turbine 22 is located above the first exhaust port 113, and the first exhaust port 113 is arranged along the tangent direction of the turbine 22; the outer wall of the rotating rod 2 is fixedly connected with at least one cam 23; one side of the cam 23 is provided with a vibration rod 24, and the vibration rod 24 is rotatably connected with the exhaust air duct 114; the second guide rail 25 is symmetrically provided on both sides of the vibration rod 24; the surface of the second guide rail 25 is provided with a semicircular sliding groove, and the both ends of the vibration rod 24 are slidingly matched with the surface sliding groove of the second guide rail 25; the end of the vibration rod 24 is fixedly connected with a knocking part;

[0038] When the exhaust is carried out at the first exhaust port 113, the airflow can be discharged through the first exhaust port 113 and pass through the turbine 22 along the tangent direction, the turbine 22 can rotate under the cooperation of the airflow and the surface arc fin, at this time the turbine 22 can drive the cam 23 to rotate, the cam 23 can periodically hit the end of the vibration rod 24 obliquely, so that the vibration rod 24 can periodically slide along the second guide rail 25, and the vibration rod 24 can hit the top of the inner wall of the exhaust air duct 114 through the end knocking part when moving, thereby the mold system composed of the upper mold 17 and the bottom mold 112 can be vibrated, so as to accelerate the redistribution of the sand particles in the internal forming cavity, reduce the gap between the sand particles, and improve the compactness of the sand core; through the cooperation of the cam 23 and the vibration rod 24, the cam 23 can rotate under the action of the gas and make the vibration rod 24 knock the exhaust air duct 114, so as to apply a vibration effect to the sand particles in the forming cavity and assist the redistribution of the sand particles.

[0039] Please refer to Figure 5 As shown, the second guide rail 25 is provided with a resistance plate 3 on one side, the surface of the resistance plate 3 is provided with a friction surface, and the cross section of the friction surface is arranged in a decreasing manner from bottom to top; the end of the vibration rod 24 is in contact with the resistance plate 3;

[0040] By arranging the resistance plate 3, when the vibration rod 24 moves downward to reset in the reciprocating process, for example, the contact area between the vibration rod 24 and the surface friction surface of the resistance plate 3 can increase linearly, so that the resistance received by the vibration rod 24 when moving downward also increases, which can slow down the vibration rod 24, thereby reducing the speed of the vibration rod 24 when contacting the inner wall of the surface sliding groove of the second guide rail 25, reducing the damage between the vibration rod 24 and the second guide rail 25 caused by collision, and when moving upward, the vibration rod 24 can overcome the static friction between the vibration rod 24 and the resistance plate 3 under the knocking action of the cam 23, and the friction area between the vibration rod 24 and the resistance plate 3 decreases linearly in the subsequent upward movement, so as to reduce the influence of the resistance received by the vibration rod 24 before knocking the exhaust air duct 114 to the greatest extent.

[0041] Please refer to Figure 6As shown, the upper die 17 is provided with a plurality of ball seats on the top, and the ball seats are in communication with the exhaust air duct 114; the upper die 17 is fixedly connected with a plurality of exhaust cylinders 4 on the top; the inner wall of the exhaust cylinder 4 is fixedly connected with a first spring 42 on the top; the bottom of the first spring 42 is fixedly connected with a first ball 43, and the first ball 43 is correspondingly arranged with the ball seat; the outer wall of the exhaust cylinder 4 is provided with a plurality of holes;

[0042] When the exhaust air duct 114 is used to exhaust the forming cavity, the inside of the exhaust air duct 114 will be in a positive pressure state. When the pressure is large enough, the first ball 43 can be pushed out of the ball seat under the action of the air pressure, and the first spring 42 is in a compressed state. At this time, the exhaust air duct 114 and the outside flow path can be newly provided with the exhaust cylinder 4, that is, part of the gas can be discharged outward through the surface holes of the exhaust cylinder 4, so as to improve the bearing capacity of the device during exhaust, and ensure that the gas in the forming cavity can be discharged in time.

[0043] Please refer to Figure 6 As shown, the top of the first ball 43 is fixedly connected with a vertical rod 5; the outer wall of the exhaust cylinder 4 is sleeved with a sealing cover 52, and the sealing cover 52 is rotatably connected with the upper die 17; the inner wall of the sealing cover 52 is fixedly connected with a third guide rail 53, and the end of the vertical rod 5 is slidably connected with the third guide rail 53; the outer wall of the sealing cover 52 is provided with a plurality of holes;

[0044] When the exhaust air duct 114 is not used for exhaust, the surface holes of the sealing cover 52 and the holes of the outer wall of the exhaust cylinder 4 are staggered, that is, the sealing cover 52 can block the surface holes of the exhaust cylinder 4, so that the inside of the exhaust cylinder 4 can be a closed environment, so as to isolate the exhaust cylinder 4 and its internal components from the outside environment. When the sand shooter 14 is reset under the driving action of the first air cylinder 16, the bottom sand shooting head may overflow sand particles. At this time, the sealing cover 52 can block these sand particles and impurities, so as to reduce the pollution of the internal components of the exhaust cylinder 4. In addition, when the exhaust air duct 114 is used for exhaust, the vertical rod 5 will rise along with the first ball 43 and slide along the third guide rail 53. The vertical rod 5 will first slide along the spiral ascending section of the third guide rail 53. In the process, the third guide rail 53 can rotate with the sealing cover 52 under the limiting action of the vertical rod 5, until the sealing cover 52 can unblock the exhaust cylinder 4. The latter half of the vertical rod 5 will move along the vertical section of the third guide rail 53.

[0045] Please refer to Figure 6 As shown, the bottom of the first ball 43 is provided with a hole, and the first ball 43 is in communication with the ball seat; the first ball 43 is provided with a second ball 6 inside; a plurality of fixed blocks 62 are fixedly connected to the upper half of the inner wall of the first ball 43;

[0046] When the air pressure in the exhaust air duct 114 is large enough, part of the gas can enter the inside of the first spherical ball 43 through the hole at the bottom of the first spherical ball 43, so that the first spherical ball 43 can be lifted up under the action of the air pressure, and the second spherical ball 6 in the inside of the first spherical ball 43 can move irregularly under the action of the turbulent gas flow in the inside of the first spherical ball 43. The second spherical ball 6 will continuously collide with the fixed block 62 during the movement, so as to generate a vibration effect, and further transmit the vibration to the molding cavity between the upper die 17 and the bottom die 112, so as to further speed up the redistribution of the sand particles in the inside of the molding cavity.

[0047] Please refer to Figures 7 to 9 As shown in the figure, the bottom of the second sliding plate 110 is fixedly connected with a fixed plate 7; a plurality of ejector pins 72 are arranged on the surface of the fixed plate 7 and are fixedly connected; the ejector pins 72 and the bottom die 112 are arranged in a penetrating manner and are connected in a sliding manner; one end of the ejector pin 72 is provided with a plurality of holes, and the other end is provided with a hollow structure;

[0048] When the sand shooter 14 shoots sand, the end of the ejector pin 72 is flush with the parting surface of the first sliding plate 12. Since the end of the ejector pin 72 is provided with a plurality of holes, the sand particles can be intercepted, and the gas in the bottom of the molding cavity can be discharged to the outside through the ejector pin 72, thereby assisting the exhaust. When the mold is removed, the fourth air cylinder 111 resets the bottom die 112, and the ejector pin 72 is in a stationary state, so that the sand core can be pulled out of the bottom die 112 under the support of the ejector pin 72 during the process, thereby realizing automatic demolding of the sand core and facilitating subsequent taking out of the sand core.

[0049] Please refer to Figure 9 As shown in the figure, the inner wall of the ejector pin 72 is fixedly connected with a second spring 82; the end of the second spring 82 is fixedly connected with a bottom plate 8; the side close to the second spring 82 of the bottom plate 8 is fixedly connected with a top plate 83; a plurality of cleaning rods 84 are fixedly connected to one side of the top plate 83, and the cleaning rods 84 are arranged in a corresponding manner with the holes at the end of the ejector pin 72;

[0050] When there is gas at the bottom of the molding cavity, the gas can extrude the cleaning rods 84 under the action of the positive pressure, so that the assembly composed of the bottom plate 8, the top plate 83 and the cleaning rods 84 moves and the second spring 82 is in a stretched state. At this time, the gas can be discharged from the gap between the bottom plate 8 and the ejector pin 72. When the exhaust stops, the bottom plate 8 and the top plate 83 will reset under the action of the elastic force of the second spring 82 and make the cleaning rods 84 inserted into one side of the ejector pin 72 and dredge the holes on one side of the ejector pin 72.

[0051] Please refer to Figure 10 and Figure 11As shown, the sand supply assembly comprises a tank 9; the tank 9 is fixedly installed on the top of the frame 1; the top of the tank 9 is fixedly connected with a cover plate 92; the gap between the cover plate 92 and the tank 9 is fixedly connected with a screen 95; the top of the cover plate 92 is fixedly connected with a motor 93; the output end of the motor 93 is fixedly connected with a rotating shaft 94; the rotating shaft 94 is penetratingly arranged in the cover plate 92 and is rotationally connected with the cover plate 92; the outer wall of the rotating shaft 94 is fixedly connected with a plurality of stirring blades 96, and the surface of the stirring blades 96 is serrated;

[0052] The opening between the top of the tank 9 and the cover plate 92 is used for lifting feeding by the auger conveyor, and the screen 95 can intercept large materials in the raw materials; when the sand supply assembly supplies the sand shooter 14, the on-off valve at the bottom of the tank 9 can be opened and the coated sand can be pumped into the sand shooter 14, and when the tank 9 stores the coated sand, the motor 93 can be started to drive the rotating shaft 94 to rotate, and the rotating shaft 94 can drive the stirring blades 96 to rotate; since the surface of the stirring blades 96 is serrated, the powder in the tank 9 can be cut and broken, thereby improving the loose degree of the coated sand in the tank 9, so as to improve the quality of the subsequent sand shooting.

[0053] Please refer to Figure 11 As shown, the outer wall of the rotating shaft 94 is fixedly connected with a beating plate 10, and the beating plate 10 is correspondingly arranged with the screen 95;

[0054] By arranging the beating plate 10, when the rotating shaft 94 rotates, the large materials in the screen 95 can be beaten and crushed, thereby reducing the accumulation of materials in the screen 95 and improving the utilization rate of the materials by the device.

[0055] Working principle: through the start of the third cylinder 19 drive the second sliding plate 110 along the first guide rail 18 sliding, until the second sliding plate 110 with the bottom die 112 in the upper die 17 just below, then can start the fourth cylinder 111 push the bottom die 112 and make the bottom die 112 and the upper die 17 butt joint, the bottom die 112 and the upper die 17 butt joint can start the first cylinder 16 drive sand shooter 14 to the upper die 17 close, until the sand shooter 14 is located in the upper die 17 just above, then can start the second cylinder 161 to push the sand shooter 14 to the upper die 17 top close and make the sand shooter 14 bottom sand head and the upper die 17 top sand inlet butt joint, then can be transported through the sand feeding assembly inside the sand shooter 14, and cooperate with the high pressure gas flow supply equipment connected with the end of the air inlet pipe 15, so that the coated sand can cooperate with compressed air core shooting work, the upper die 17 or the bottom die 112 can be provided with electric heating structure, so as to speed up the sand core forming speed, after the sand core forming, the first cylinder 16 and the fourth cylinder 111 can be used to reset the bottom die 112 and the sand shooter 14 respectively, finally the third cylinder 19 can be used to reset the bottom die 112, and the bottom die 112 top sand core is taken out, the above principle is the mature technology in the art, so the unmentioned in the application can refer to the existing technology, while the air mixed between the sand particles and the gas produced during the curing of the sand core will accumulate in the forming cavity between the upper die 17 and the bottom die 112, these gases can flow into the exhaust air duct 114 through the first exhaust port 113, and be discharged to the outside through the second exhaust port 115, at the same time, because a pair of protrusions 116 is arranged between the first exhaust port 113 and the second exhaust port 115, the gas flow area is narrowed at the inlet end of the protrusion 116, so that the gas flow in the exhaust air duct 114 will accelerate due to the reduction of the flow area, thereby accelerating the exhaust of the gas in the exhaust air duct 114, it is worth mentioning that the inner wall of the first exhaust port 113 should be provided with filtering measures, which can be a filter screen, to reduce the entry of sand particles into the exhaust air duct 114, which is not shown in the figure; when the first exhaust port 113 is used for exhaust, the gas flow can be discharged through the first exhaust port 113 and pass through the turbine 22 in the tangential direction, the turbine 22 can rotate under the action of the gas flow and the surface arc fin, at this time the turbine 22 can drive the cam 23 to rotate, the cam 23 can periodically hit the end of the vibration rod 24 obliquely, so that the vibration rod 24 can periodically slide along the second guide rail 25, the vibration rod 24 can hit the top of the exhaust air duct 114 wall through the end knocking part when moving, thereby making the mold body composed of the upper die 17 and the bottom die 112 vibrate, so as to accelerate the redistribution of sand particles in the forming cavity, reduce the gap between sand particles, and improve the compactness of the sand core;By setting the resistance plate 3, the vibration rod 24 in the process of reciprocating motion, for example, the vibration rod 24 and the resistance plate 3 surface friction contact area can be linearly increased, and then the vibration rod 24 down resistance will also increase, can slow down the effect of the vibration rod 24, and then reduce the speed of the vibration rod 24 and the second guide rail 25 surface sliding groove inner wall contact, reduce the damage between the vibration rod 24 and the second guide rail 25 due to collision, while the vibration rod 24 can overcome the static friction between the cam 23 and the resistance plate 3 under the action of the beating, and the subsequent friction area between the vibration rod 24 is linearly reduced, to reduce the impact of the vibration rod 24 on the exhaust air duct 114 before hitting the resistance; When the exhaust air duct 114 is used to exhaust the forming cavity, the inside of the exhaust air duct 114 will be in a positive pressure state, when the pressure is large enough, the first ball 43 can be pushed out of the ball seat under the action of the air pressure, and the first spring 42 is in a compressed state, at this time, the exhaust air duct 114 and the outside flow path can be added at the exhaust cylinder 4, that is, part of the gas can be discharged outward through the surface hole of the exhaust cylinder 4, so as to improve the bearing capacity of the device during exhaust, and ensure that the gas in the forming cavity can be discharged in time; When the exhaust air duct 114 is not used for exhaust, the surface hole of the sealing cover 52 and the hole of the exhaust cylinder 4 are staggered, that is, the sealing cover 52 can block the surface hole of the exhaust cylinder 4, so that the exhaust cylinder 4 and its internal components can be isolated from the outside environment, when the sand shooter 14 is reset under the driving action of the first cylinder 16, the bottom sand shooting head may overflow sand particles, at this time, the sealing cover 52 can block these sand particles and impurities, so as to reduce the pollution of the internal components of the exhaust cylinder 4, in addition, when the exhaust air duct 114 is used for exhaust, the vertical rod 5 will rise along with the first ball 43 and slide along the third guide rail 53, the vertical rod 5 will first slide along the spiral ascending segment of the third guide rail 53, in the process, the third guide rail 53 can rotate with the sealing cover 52 under the limiting action of the vertical rod 5, until the sealing cover 52 can remove the blocking of the exhaust cylinder 4, and the second half of the vertical rod 5 will move along the vertical segment of the third guide rail 53; When the air pressure in the exhaust air duct 114 is large enough, part of the gas can enter the inside of the first ball 43 through the hole at the bottom of the first ball 43, so that the first ball 43 can be lifted under the action of the air pressure, and the second ball 6 in the first ball 43 can move irregularly under the action of the turbulent airflow in the first ball 43, the second ball 6 will collide with the fixed block 62 during the movement, so as to produce vibration effect, and then the vibration can be transmitted to the forming cavity between the upper die 17 and the bottom die 112, further accelerating the redistribution of sand particles in the forming cavity;When the sand shooter 14 shoots sand, the end of the ejector pin 72 is flush with the parting surface of the first slide plate 12, and the end of the ejector pin 72 is provided with multiple holes to intercept sand particles, and the gas in the bottom of the forming cavity can be discharged to the outside through the ejector pin 72, and the auxiliary device discharges the gas, and when the mold is removed, the fourth cylinder 111 resets the bottom mold 112, and the ejector pin 72 is in a static state, so that the sand core can be pulled out of the bottom mold 112 under the support of the ejector pin 72, realizing automatic demolding of the sand core and facilitating subsequent removal of the sand core; when there is gas at the bottom of the forming cavity, the gas can extrude the cleaning rod 84 under the action of positive pressure, so that the assembly composed of the bottom plate 8, the top plate 83 and the cleaning rod 84 moves and the second spring 82 is in a stretched state, at this time the gas can be discharged from the gap between the bottom plate 8 and the ejector pin 72, and when the gas discharge stops, the bottom plate 8 and the top plate 83 will reset under the action of the elastic force of the second spring 82 and make the cleaning rod 84 inserted into one side of the ejector pin 72 and dredge the hole on one side of the ejector pin 72; the opening between the top of the tank 9 and the cover plate 92 is used for lifting and feeding by the auger conveyor, and the screen 95 can intercept large materials in the raw materials, and when the sand feeding assembly feeds the sand shooter 14, the on-off valve at the bottom of the tank 9 can be opened and the coated sand can be pumped into the sand shooter 14, and when the tank 9 stores the coated sand, the motor 93 can be started to drive the rotating shaft 94 to rotate, and the rotating shaft 94 can drive the stirring blade 96 to rotate, and since the surface of the stirring blade 96 is serrated, the powder in the tank 9 can be cut and broken, thereby improving the loose degree of the coated sand in the tank 9 to improve the quality of subsequent sand shooting; by setting the beating plate 10, the rotating shaft 94 can beat and crush the large materials in the screen 95 when rotating, thereby reducing the materials accumulated in the screen 95 and improving the utilization rate of the materials by the device.

[0056] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application, and various changes and improvements can be made without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the claimed present application.

Claims

1. A foundry coated sand core shooting machine, comprising a rack (1), a movable mold assembly, a fixed mold assembly, a sand shooting assembly, a sand feeding assembly, characterized in that: the fixed mold assembly comprises an upper mold (17); the upper mold (17) and the rack (1) are in a fixed connection; the upper mold (17) is provided with a sand inlet at the top and a forming chamber at the bottom; an exhaust air duct (114) is formed in the inner wall of the upper mold (17); a plurality of first exhaust ports (113) are formed in the bottom of the exhaust air duct (114), and the first exhaust ports (113) are in communication with the forming chamber; a plurality of second exhaust ports (115) are formed in the side wall of the exhaust air duct (114); a plurality of pairs of protrusions (116) are fixedly connected to the inner wall of the exhaust air duct (114); the protrusions (116) are located between the first exhaust ports (113) and the second exhaust ports (115); the movable mold assembly comprises a first guide rail (18); a third air cylinder (19) is fixedly connected to one side of the first guide rail (18), and a second sliding plate (110) is fixedly connected to the output end of the third air cylinder (19); the second sliding plate (110) and the first guide rail (18) are in sliding connection; a fourth air cylinder (111) is fixedly connected to the bottom of the second sliding plate (110); a bottom mold (112) is fixedly connected to the output end of the fourth air cylinder (111), and the bottom mold (112) is provided with a parting surface; the sand shooting assembly comprises a first sliding plate (12); the first sliding plate (12) and the rack (1) are in sliding connection; a first air cylinder (16) is fixedly connected to one side of the rack (1); the output end of the first air cylinder (16) is in fixed connection with the first sliding plate (12); a second air cylinder (161) is fixedly connected to the top of the first sliding plate (12); a sand shooter (14) is fixedly connected to the output end of the second air cylinder (161); a plurality of telescopic rods (13) are fixedly connected between the sand shooter (14) and the first sliding plate (12); a plurality of air inlet pipes (15) are in communication with the middle of the sand shooter (14), and the bottom of the sand shooter (14) is provided with a sand shooting head; the sand feeding assembly is in communication with the sand shooter (14) through a pipeline, and is used for conveying coated sand in the sand shooter (14); a plurality of ball seats are provided on the top of the upper mold (17), and the ball seats are in communication with the exhaust air duct (114); a plurality of exhaust cylinders (4) are fixedly connected to the top of the upper mold (17); a first spring (42) is fixedly connected to the inner wall top of the exhaust cylinder (4); a first ball (43) is fixedly connected to the bottom of the first spring (42), and the first ball (43) is correspondingly arranged with the ball seat; the outer wall of the exhaust cylinder (4) is provided with a plurality of holes; a vertical rod (5) is fixedly connected to the top of the first ball (43); a sealing cover (52) is sleeved on the outer wall of the exhaust cylinder (4), and the sealing cover (52) is rotatably connected with the upper mold (17); a third guide rail (53) is fixedly connected to the inner wall of the sealing cover (52), and the end of the vertical rod (5) is in sliding connection with the third guide rail (53); the outer wall of the sealing cover (52) is provided with a plurality of holes.

2. A coated sand core shooter as defined in claim 1, characterized in that: The exhaust air duct (114) inner wall rotationally connects a pair of rotating rods (2), and the pair of rotating rods (2) are symmetrically distributed; the outer wall of the rotating rod (2) is fixedly connected with a turbine (22); the turbine (22) is located above the first exhaust port (113), and the first exhaust port (113) is arranged along the tangent direction of the turbine (22); the outer wall of the rotating rod (2) is fixedly connected with at least one cam (23); one side of the cam (23) is provided with a vibrating rod (24), and the vibrating rod (24) is rotationally connected with the exhaust air duct (114); the second guide rail (25) is symmetrically arranged on both sides of the vibrating rod (24); the surface of the second guide rail (25) is provided with a semicircular sliding groove, and the both ends of the vibrating rod (24) are slidingly matched with the surface sliding groove of the second guide rail (25); the end of the vibrating rod (24) is fixedly connected with a knocking part.

3. A coated sand core shooter as defined in claim 2, characterized in that: One side of the second guide rail (25) is provided with a resistance plate (3), and the surface of the resistance plate (3) is provided with a friction surface, and the cross section of the friction surface is arranged in a decreasing manner from bottom to top; the resistance plate (3) is in contact with the end of the vibrating rod (24).

4. A coated sand core shooter as defined in claim 3, characterized in that: The bottom of the first ball (43) is provided with an opening, and the first ball (43) is in communication with the ball seat; the first ball (43) is internally provided with a second ball (6); the upper half of the inner surface of the first ball (43) is fixedly connected with a plurality of fixed blocks (62).

5. A coated sand core shooter as defined in claim 4, characterized in that: The bottom of the second sliding plate (110) is fixedly connected with a fixed plate (7); a plurality of thimbles (72) are penetratingly arranged on the surface of the fixed plate (7) and are fixedly connected; the thimbles (72) are penetratingly arranged on the bottom die (112) and are slidingly connected; one end of the thimbles (72) is provided with a plurality of holes, and the other end is provided with a hollow.

6. A coated sand core shooter as defined in claim 5, characterized in that: The inner wall of the thimble (72) is fixedly connected with a second spring (82); the end of the second spring (82) is fixedly connected with a bottom plate (8); the side close to the second spring (82) of the bottom plate (8) is fixedly connected with a top plate (83); a plurality of cleaning rods (84) are fixedly connected on one side of the top plate (83), and the cleaning rods (84) are correspondingly arranged with the holes in the end of the thimble (72).

7. A coated sand core shooter as defined in claim 6, characterized in that: The sand supply assembly comprises a tank body (9); the tank body (9) is fixedly installed on the top of the rack (1); the top of the tank body (9) is fixedly connected with a cover plate (92); the gap between the cover plate (92) and the tank body (9) is fixedly connected with a screen (95); the top of the cover plate (92) is fixedly connected with a motor (93); the output end of the motor (93) is fixedly connected with a rotating shaft (94); the rotating shaft (94) is penetratingly arranged on the cover plate (92) and is rotationally connected; a plurality of stirring blades (96) are fixedly connected on the outer wall of the rotating shaft (94), and the surface of the stirring blades (96) is serrated.

8. A coated sand core shooter as defined in claim 7, characterized in that: The outer wall of the rotating shaft (94) is fixedly connected with a beating plate (10), and the beating plate (10) is correspondingly arranged with the screen (95).

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