阅读说明：本技术 离心铸铝新型浇口套 (Centrifugal cast aluminium sprue bush ) 是由 高卫宁 刘国柱 任国斌 郭凌云 贾世凯 李广才 于 2020-11-17 设计创作，主要内容包括：本发明涉及离心铸造技术领域,提出了一种离心铸铝新型浇口套,包括浇口套本体；第一过滤网设于浇口套本体内,第一过滤网的横截面与浇口套本体的轴线相互垂直；导流板设于第一过滤网的底面,导流板与第一过滤网的网眼错位设置；连接自锁组件设于浇口套本体上,用于使浇口套本体连接在砂箱入料管；开合组件设于浇口套本体的开口处并包括转轴,挡板和卷簧,转轴设于浇口套本体上,挡板套设在转轴上且借助转轴与浇口套本体转动连接,卷簧设于浇口套本体上。通过上述技术方案,解决了相关技术中浇口套开口大小不能改变的问题。(The invention relates to the technical field of centrifugal casting, and provides a novel sprue bush for centrifugal casting of aluminum, which comprises a sprue bush body; the first filter screen is arranged in the sprue bush body, and the cross section of the first filter screen is vertical to the axis of the sprue bush body; the guide plate is arranged on the bottom surface of the first filter screen, and meshes of the guide plate and the first filter screen are arranged in a staggered manner; the connecting self-locking assembly is arranged on the sprue bush body and is used for connecting the sprue bush body to the sand box feeding pipe; the opening and closing assembly is arranged at the opening of the sprue bush body and comprises a rotating shaft, a baffle and a coil spring, the rotating shaft is arranged on the sprue bush body, the baffle is sleeved on the rotating shaft and is rotatably connected with the sprue bush body by virtue of the rotating shaft, and the coil spring is arranged on the sprue bush body. Through above-mentioned technical scheme, the problem that the size of runner cover opening can not change among the correlation technique has been solved.)

1. The utility model provides a novel sprue bush of centrifugal cast aluminium which characterized in that includes:

a sprue bush body (1);

the first filter screen (2) is arranged in the sprue bush body (1) and is used for filtering impurities in the aluminum water, and the cross section of the first filter screen (2) is perpendicular to the axis of the sprue bush body (1);

the guide plates (3) are arranged on the bottom surface of the first filter screen (2), and meshes of the guide plates (3) and the first filter screen (2) are arranged in a staggered mode;

the connecting self-locking assembly (4) is arranged on the sprue bush body (1) and is used for connecting the sprue bush body (1) with a sand box feeding pipe (5); and

the opening and closing assembly (6) is arranged at the opening of the sprue bush body (1), the opening and closing assembly (6) comprises a plurality of rotating shafts (7), baffle plates (8) and coil springs (9), the rotating shaft (7), the baffle (8) and the coil spring (9) are in one-to-one correspondence, the rotating shaft (7) is arranged on the sprue bush body (1), the baffle plate (8) is sleeved on the rotating shaft (7) and is rotatably connected with the sprue bush body (1) by means of the rotating shaft (7), the coil spring (9) is arranged on the sprue bush body (1), one end of the coil spring (9) is contacted with the baffle plate (8), is used for resetting the baffle (8), when the sprue bush body (1) rotates along with the sand box feeding pipe (5), the baffle plates (8) press the coil springs (9) under the action of centrifugal force, and the size of an opening formed by the baffle plates (8) changes along with the centrifugal force.

2. The novel centrifugal cast aluminum sprue bush according to claim 1, further comprising a second filter screen (10), wherein a first groove (11) and a second groove (12) are formed in the sprue bush body (1), the second groove (12) is communicated with the first groove (11), a protrusion (13) is arranged outside the second filter screen (10), the protrusion (13) penetrates through the second groove (12) and then is slidably arranged in the first groove (11), a tension spring (14) is arranged in the first groove (11), one end of the tension spring (14) is connected to the inner wall of the first groove (11), and the other end of the tension spring is connected to the protrusion (13).

3. The new sprue bushing of centrifugal cast aluminum according to claim 2, wherein the mesh size of the first filter (2) is the same as the mesh size of the second filter (10).

4. The novel centrifugal cast aluminum sprue bush according to claim 3, wherein the first groove (11), the second groove (12), the protrusion (13) and the tension spring (14) are two and are arranged in one-to-one correspondence.

5. The new sprue bushing of centrifugal cast aluminum according to claim 1, wherein the connecting self-locking assembly (4) comprises:

the first connecting plate (15) is arranged on the sand box feeding pipe (5) and is provided with a through hole;

the second connecting plate (16) is arranged on the sprue bush body (1) and is provided with a sliding groove (17), and the bottom of the sliding groove (17) is provided with a through hole (18);

the pull rod (19) penetrates through the through hole and the penetrating hole (18), and clamping holes (20) are formed in the end parts of the pull rod (19) which penetrate through the penetrating hole (18);

the clamping block (21) is arranged in the sliding groove (17) in a sliding mode, and the end portion of one end of the clamping block penetrates through the clamping hole (20); and

and one end of the spring (22) is connected with the clamping block (21), and the other end of the spring is connected to the sprue bush body (1).

6. The novel centrifugal cast aluminum sprue bush according to claim 5, wherein the clamping holes (20) are square holes, and the clamping ends of the clamping blocks (21) are square.

7. The novel centrifugal cast aluminum sprue bush according to claim 6, wherein the number of the connecting self-locking assemblies (4) is three and the connecting self-locking assemblies are circumferentially and uniformly distributed on the outer side of the sprue bush body (1).

8. The novel centrifugal cast aluminum sprue bush according to claim 1, wherein a plurality of baffles (8) are arranged in a staggered manner from top to bottom, six baffles (8), six rotating shafts (7) and six coil springs (9) are all arranged, and six baffles (8) are circumferentially and uniformly distributed.

9. Novel centrifugal cast aluminium sprue bush according to claim 8, characterised in that the baffles (8) have an included angle of 60 °.

10. The novel centrifugal cast aluminum sprue bush according to claim 1, further comprising a bearing ring (23) and a balancing weight (24), wherein the bearing ring (23) is sleeved on the sprue bush body (1), the balancing weight (24) is connected with one side of the baffle (8) and is arranged on the bearing ring (23) in a sliding manner, and the balancing weight (24) is multiple and corresponds to the baffle (8) in a one-to-one manner.

Technical Field

The invention relates to the technical field of centrifugal casting, in particular to a novel sprue bush for centrifugal cast aluminum.

Background

Centrifugal casting is a method in which a metal melt is poured into a cavity rotating at a high speed and solidified under the action of centrifugal force to obtain a casting, and is commonly used for manufacturing sleeve-type composite metal castings. In a common centrifugal casting method, the filling of the cavity of the hollow mold is based on the rotation of the hollow mold about an axis of rotation. As a result of this rotational action, during pouring of the liquid molten casting material, corresponding centrifugal forces act on the casting material, pressing it into the mold cavity and ensuring complete filling. In the on-spot use of centrifugal cast aluminium, high temperature aluminium water is entering into the runner cover, but the flow of aluminium water can change along with the capacity of the aluminium water of die cavity, when beginning to pour into usually, the flow of aluminium water is great, and when filling soon, the flow can significantly reduce, because the rotation of runner cover, can cause a small amount of aluminium water to splash away from the opening of runner cover, the condition that appears hindering the people. In order to avoid personal injury from such situations, a new sprue bush needs to be selected.

Disclosure of Invention

The invention provides a novel sprue bush for centrifugal cast aluminum, which solves the problem that the opening size of the sprue bush cannot be changed in the related technology.

The technical scheme of the invention is as follows: a novel sprue bush for centrifugal cast aluminum comprises:

a sprue bush body;

the first filter screen is arranged in the sprue bush body and used for filtering impurities in the aluminum water, and the cross section of the first filter screen is perpendicular to the axis of the sprue bush body;

the guide plates are arranged on the bottom surface of the first filter screen, and the meshes of the guide plates and the first filter screen are arranged in a staggered mode;

the connecting self-locking assembly is arranged on the sprue bush body and is used for connecting the sprue bush body to a sand box feeding pipe; and

the opening and closing assembly is arranged at an opening of the sprue bush body and comprises a plurality of rotating shafts, a baffle and a coil spring, wherein the rotating shafts, the baffle and the coil spring are in one-to-one correspondence, the rotating shafts are arranged on the sprue bush body, the baffle is sleeved on the rotating shafts and is rotatably connected with the sprue bush body by virtue of the rotating shafts, the coil spring is arranged on the sprue bush body, one end of the coil spring is in contact with the baffle and used for resetting the baffle, and when the sprue bush body rotates along with a sand box feeding pipe, the baffle extrudes the coil spring under the action of centrifugal force, and the opening size formed by the baffle is changed along with the centrifugal force.

As a further technical scheme, still include the second filter screen, first recess and second recess have been seted up to the inside of runner cover body, the second recess with first recess intercommunication, the outside of second filter screen is provided with the arch, the arch passes slide behind the second recess and set up in the first recess, be provided with the extension spring in the first recess, the one end of extension spring is connected on the inner wall of first recess, and the other end is connected the arch.

In a further aspect, the first filter has a mesh size equal to that of the second filter.

As a further technical scheme, the first groove, the second groove, the protrusion and the tension spring are two and are arranged in a one-to-one correspondence mode.

As a further technical solution, the connection self-locking assembly includes:

the first connecting plate is arranged on the sand box feeding pipe and is provided with a through hole;

the second connecting plate is arranged on the sprue bush body and is provided with a sliding chute, and the bottom of the sliding chute is provided with a through hole;

the pull rod penetrates through the through hole and the penetrating hole, and clamping holes are formed in the end parts of the pull rod, which penetrate through the through hole and penetrate through the penetrating hole;

the clamping block is arranged in the sliding groove in a sliding mode, and the end part of one end of the clamping block penetrates through the clamping hole; and

and one end of the spring is connected with the clamping block, and the other end of the spring is connected to the sprue bush body.

As a further technical scheme, the clamping hole is a square hole, and the clamping end of the clamping block is square.

As a further technical scheme, the number of the connecting self-locking assemblies is three, and the connecting self-locking assemblies are circumferentially and uniformly distributed on the outer side of the sprue bush body.

As a further technical scheme, the baffle plates are arranged in a vertically staggered mode, the number of the baffle plates, the number of the rotating shafts and the number of the coil springs are six, and six baffle plates are evenly distributed in a circumferential mode.

As a further technical scheme, the baffle has an included angle of 60 degrees.

As a further technical scheme, the sprue bush further comprises a bearing ring and balancing weights, wherein the bearing ring is sleeved on the sprue bush body, the balancing weights are connected with one side of the baffle and are arranged on the bearing ring in a sliding mode, and the balancing weights are multiple and correspond to the baffle one to one.

The working principle and the beneficial effects of the invention are as follows: compared with the prior art, the first filter screen is arranged in the sprue bush body and used for filtering impurities in high-temperature aluminum water, and in order to improve the filtering effect, the first filter screen is horizontally arranged, namely the cross section of the first filter screen is vertical to the axis of the sprue bush body; the guide plates are uniformly arranged on the bottom surface of the first filter screen, the guide plates can guide the flow of the molten aluminum which passes through the first filter screen, the splashing degree of the molten aluminum under the action of centrifugal force during rotation is reduced, the molten aluminum can be ensured to smoothly flow into a material inlet pipe of the sand box, and the guide plates and meshes of the first filter screen are arranged in a staggered manner, so that the guide plates can be prevented from blocking meshes of the first filter screen, and the negative influence of the guide plates on the first filter screen is reduced; the connecting self-locking assembly is arranged on the sprue bush body and is used for fixing the sprue bush body on a sand box feeding pipe; the opening and closing assembly is arranged on the sprue bush body and comprises a rotating shaft, a baffle plate and a coil spring, the rotating shaft, the baffle plate and the coil spring are arranged in a one-to-one correspondence mode, namely one rotating shaft corresponds to one baffle plate and one coil spring, the rotating shaft is arranged on the sprue bush body, the baffle plate is sleeved on the rotating shaft, the coil spring is arranged on the sprue bush, one end of the coil spring is pressed on the sprue bush in a propping mode, the baffle plate has a certain initial position through the coil spring, the baffle plates cover an opening of the sprue bush and cover the sprue bush when the sprue bush body does not rotate, when the sprue bush rotates, the baffle plate deviates under the action of centrifugal force, the baffle plate is extruded on the coil spring to enable the coil spring to bear force, and as the baffle plates are completely identical, one sprue can be opened among the baffle plates, aluminum water enters the sprue bush from the sprue bush, and the rotating speed of the sprue bush is, can realize that the baffle receives different centrifugal force, and then can guarantee the change of the open-ended size that a plurality of baffles formed, when the intraductal aluminium water of sand box pan feeding was full soon, can reduce the flow of aluminium water and the rotational speed of sand box pan feeding pipe, the opening that the baffle formed diminishes, reduces the phenomenon that the aluminium water appears splashing away.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

FIG. 1 is a schematic isometric view of the present invention;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is an enlarged view of a portion of FIG. 1 at I;

FIG. 4 is a schematic structural view of the folding assembly shown in FIG. 1 with the folding assembly hidden;

FIG. 5 is an exploded view of a portion of the structure of FIG. 4;

FIG. 6 is an exploded view of the self-locking assembly of the present invention;

FIG. 7 is a schematic structural view of a sprue bushing body according to the present invention;

FIG. 8 is a schematic view of a configuration of the first filter and the baffle of the present invention;

FIG. 9 is a schematic view of the first filter and second filter being in mesh registration in accordance with the present invention;

FIG. 10 is a schematic view of the first filter and the second filter being arranged in a staggered mesh arrangement in accordance with the present invention;

FIG. 11 is a view showing a state where a plurality of baffle openings are large in the present invention;

FIG. 12 is a view showing a state where a plurality of baffle openings are small in the present invention.

In the figure:

1. sprue bush body, 2, first filter screen, 3, the guide plate, 4, connect the auto-lock subassembly, 5, sand box pan feeding pipe, 6, the subassembly that opens and shuts, 7, the pivot, 8, the baffle, 9, the wind spring, 10, the second filter screen, 11, first recess, 12, the second recess, 13, the arch, 14, the extension spring, 15, first connecting plate, 16, the second connecting plate, 17, the spout, 18, the through hole, 19, the pull rod, 20, the card hole, 21, the fixture block, 22, the spring, 23, the carrier ring, 24, the balancing weight, 25, the jam.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any inventive step, are intended to be within the scope of the present invention.

As shown in fig. 1 to 12, the present embodiment proposes a novel sprue bush for centrifugal casting of aluminum, including:

a sprue bush body 1;

the first filter screen 2 is arranged in the sprue bush body 1 and used for filtering impurities in the aluminum water, and the cross section of the first filter screen 2 is perpendicular to the axis of the sprue bush body 1;

the guide plates 3 are arranged on the bottom surface of the first filter screen 2, and the meshes of the guide plates 3 and the first filter screen 2 are arranged in a staggered mode;

the connecting self-locking assembly 4 is arranged on the sprue bush body 1 and is used for connecting the sprue bush body 1 to a sand box feeding pipe 5; and

subassembly 6 opens and shuts, locate the opening part of runner cover body 1, subassembly 6 opens and shuts is including being a plurality of pivot 7, baffle 8 and coil spring 9, pivot 7, baffle 8 and coil spring 9 one-to-one, pivot 7 is located on runner cover body 1, 8 covers of baffle are established on pivot 7 and are connected with runner cover body 1 rotation with the help of pivot 7, coil spring 9 is located on runner cover body 1, 9 one end of coil spring contact with baffle 8, be used for making baffle 8 reset, when runner cover body 1 rotates along with the sand box, baffle 8 extrudees coil spring 9 under the effect of centrifugal force, the opening size that a plurality of baffles 8 formed changes along with centrifugal force.

In the embodiment, the first filter screen 2 is arranged inside the sprue bush body 1 and used for filtering impurities in high-temperature aluminum water, and in order to improve the filtering effect, the first filter screen 2 is horizontally arranged, namely the cross section of the first filter screen 2 is vertical to the axis of the sprue bush body 1; the guide plates 3 are uniformly arranged on the bottom surface of the first filter screen 2, the guide plates 3 can guide the flow of the aluminum water passing through the first filter screen 2, the splashing degree of the aluminum water under the action of centrifugal force during rotation is reduced, the aluminum water can be ensured to smoothly flow into the material inlet pipe 5 of the sand box, and the guide plates 3 and the meshes of the first filter screen 2 are arranged in a staggered manner, so that the guide plates 3 can be ensured not to block the meshes of the first filter screen 2, and the negative influence of the guide plates 3 on the first filter screen 2 is reduced; the connecting self-locking assembly 4 is arranged on the sprue bush body 1 and is used for fixing the sprue bush body 1 on a sand box feeding pipe 5; the opening and closing assembly 6 is arranged on the sprue bush body 1, the opening and closing assembly 6 comprises a rotating shaft 7, baffle plates 8 and coil springs 9, the rotating shaft 7, the baffle plates 8 and the coil springs 9 are all arranged in a one-to-one correspondence mode, namely one rotating shaft 7 corresponds to one baffle plate 8 and one coil spring 9, the rotating shaft 7 is arranged on the sprue bush body 1, the baffle plates 8 are sleeved on the rotating shaft 7, the coil springs 9 are arranged on the sprue bush, one end of each coil spring 9 is pressed on the sprue bush, the baffle plates 8 have certain initial positions through the coil springs 9, the baffle plates 8 cover the opening of the sprue bush and cover the sprue bush when the sprue bush body 1 does not rotate, when the sprue bush rotates, the baffle plates 8 deviate under the action of centrifugal force, the baffle plates 8 are pressed on the coil springs 9 to enable the coil springs 9 to bear the force, and as the baffle plates 8 are completely identical, one sprue can be opened among the baffle plates 8, in the runner cover was entered into from this mouth to the aluminium water, through the rotational speed of adjusting the runner cover, can realize that baffle 8 receives different centrifugal forces, and then can guarantee the change of the open-ended size that a plurality of baffles 8 formed, when the aluminium water in sand box pan feeding pipe 5 was full soon, can reduce the flow of aluminium water and the rotational speed of sand box pan feeding pipe 5, the opening that baffle 8 formed diminishes, reduces the phenomenon that the aluminium water appearance splashes away.

In this embodiment, in order to push the baffle plate 8 by the coil spring 9 to restore the baffle plate 8, it is necessary that the baffle plate 8 is pressed against the coil spring 9 by the centrifugal force when the sprue bush body 1 rotates.

As shown in fig. 4, 5 and 7, based on the same concept as that of the above embodiment, the present embodiment further provides a second filter screen 10, a first groove 11 and a second groove 12 are formed in the sprue bush body 1, the second groove 12 is communicated with the first groove 11, a protrusion 13 is disposed outside the second filter screen 10, the protrusion 13 is slidably disposed in the first groove 11 after passing through the second groove 12, a tension spring 14 is disposed in the first groove 11, one end of the tension spring 14 is connected to the inner wall of the first groove 11, and the other end of the tension spring is connected to the protrusion 13.

In this embodiment, a first groove 11 and a second groove 12 are formed in a sprue bush body 1, the sprue bush body 1 is in a rotating body shape, the first groove 11 is formed in a circumferential direction, the second groove 12 is formed in an axial direction, a protrusion 13 is arranged outside a second filter 10, the protrusion 13 can be placed in the first groove 11 through the second groove 12, the protrusion 13 can slide in the first groove 11, the second filter 10 is rotatably connected with the sprue bush body 1 by virtue of the protrusion 13, a tension spring 14 is arranged in the first groove 11, one end of the tension spring 14 is fixedly connected to the bottom of the first groove 11, the other end of the tension spring is connected with the protrusion 13, when the sprue bush body 1 is not rotated, meshes of the first filter 2 and the second filter 10 are arranged in a staggered manner, when the sprue bush body 1 rotates, the first filter 2 rotates along with the rotation, under the action of inertia, the second filter screen 10 is just rotating after delaying, namely can not rotate in step, extension spring 14 is pulling the second filter screen 10 and is rotating, after sprue bush body 1 steady rotation one end time, the mesh coincidence of first filter screen 2 and second filter screen 10, such mode of setting can guarantee that the aluminium water is in the one end time that enters into sprue bush body 1, the lower leakage is less, after sprue bush body 1 rotational stabilization, can resume the maximum lower leakage of aluminium water, avoided because sprue bush body 1 is too fast rotating, lead to the aluminium water to splash the condition of going out.

In this embodiment, in order to prevent the second filter 10 from falling off from the sprue bush body 1, a plug 25 may be disposed in the second groove 12, and the plug 25 may prevent the protrusion 13 from falling off from the second groove 12

As shown in fig. 9, the present embodiment also proposes that the mesh size of the first filter 2 is the same as that of the second filter 10, based on the same concept as the above-described embodiment.

In this embodiment, the mesh sizes of the first filter screen 2 and the second filter screen 10 are completely the same, so that the maximum leakage amount of molten aluminum can be ensured while the production cost is reduced.

As shown in fig. 3 to 4, based on the same concept as the above embodiments, the present embodiment also proposes that the first groove 11, the second groove 12, the protrusion 13 and the tension spring 14 are all two and are arranged in one-to-one correspondence.

In this embodiment, two protrusions 13 and two tension springs 14 are provided to keep the second filter 10 stably rotating and stably starting and stopping.

As shown in fig. 1 to 6, based on the same concept as the above embodiments, the present embodiment further proposes that the connection self-locking assembly 4 includes:

the first connecting plate 15 is arranged on the sand box feeding pipe 5 and is provided with a through hole;

the second connecting plate 16 is arranged on the sprue bush body 1 and is provided with a sliding chute 17, and the bottom of the sliding chute 17 is provided with a penetrating hole 18;

the pull rod 19 penetrates through the through hole and the penetrating hole 18, and the end part of the pull rod 19, which penetrates through the penetrating hole 18, is provided with a clamping hole 20;

the clamping block 21 is arranged in the sliding groove 17 in a sliding mode, and the end portion of one end of the clamping block penetrates through the clamping hole 20; and

one end of the spring 22 is connected with the clamping block 21, and the other end is connected to the sprue bush body 1.

In this embodiment, the connecting self-locking assembly 4 includes a first connecting plate 15, a second connecting plate 16, a pull rod 19, a locking block 21 and a spring 22, the first connecting plate 15 is disposed on the sand box feeding pipe 5 and provided with a through hole, the second connecting plate 16 is disposed on the sprue bush body 1 and provided with a through hole 18, the pull rod 19 passes through the through hole and the through hole 18, and both ends of the pull rod 19 protrude, a cylindrical stop cap is disposed at an end of the pull rod 19 protruding out of the through hole, a locking hole 20 is disposed at an end of the pull rod 19 protruding out of the through hole 18, a sliding slot 17 is further disposed on the second connecting plate 16, the through hole 18 is disposed in the sliding slot 17, the locking block 21 is slidably disposed in the sliding slot 17, an end of one end of the locking block 21 can penetrate through the locking hole 20, the spring 22 is disposed between the locking block 21 and the sprue bush body 1, when the pull rod 19 penetrates through the through hole and the through hole 18 and an end of the locking, just realized being connected between sprue bush body 1 and the sand box pan feeding pipe 5, when sprue bush body 1 is in the pivoted, fixture block 21 is under the effect of centrifugal force, and the tip of fixture block 21 can more enter into card hole 20, can realize the auto-lock when rotating like this, avoids sprue bush body 1 to appear breaking away from with sand box pan feeding pipe 5 in the pivoted. When the sprue bush body 1 does not rotate and needs to be separated from the sand box feeding pipe 5, the spring 22 can be manually pressed to enable the fixture block 21 to be separated from the fixture hole 20, and then the pull rod 19 can be pulled out from the through hole and the penetrating hole 18, and finally separation between the sprue bush body 1 and the sand box feeding pipe 5 is achieved.

As shown in fig. 6, based on the same concept as the above embodiments, the present embodiment further proposes that the engaging hole 20 is a square hole and the engaging end of the engaging block 21 is a square.

In this embodiment, in order to realize accurate connection and realize stable auto-lock when the sprue bush rotates, can set card hole 20 to the square hole, set the joint end of fixture block 21 to the square form, can make the better auto-lock with card hole 20 of fixture block 21 under the effect of centrifugal force just.

As shown in fig. 1, based on the same concept as the above embodiments, the present embodiment further proposes that the connecting self-locking assemblies 4 are three and circumferentially and uniformly distributed on the outer side of the sprue bush body 1.

In the embodiment, in order to ensure that the sprue bush body 1 and the sand box feeding pipe 5 are stably connected when the integral device rotates, the connecting self-locking assemblies 4 are arranged in three and are arranged in a circumferentially uniform manner.

As shown in fig. 11 to 12, based on the same concept as the above embodiment, the present embodiment further proposes that a plurality of baffle plates 8 are arranged in a vertically staggered manner, each of the baffle plates 8, the rotating shaft 7 and the coil spring 9 is six, and the six baffle plates 8 are circumferentially and uniformly distributed.

In this embodiment, baffle 8 sets up to the form of misplacing from top to bottom, can reduce baffle 8's cost like this to select baffle 8 for six, reduced the difficulty of processing manufacturing.

As shown in fig. 11 to 12, the present embodiment also proposes the baffle 8 to have an angle of 60 ° based on the same concept as the above-described embodiment.

In this embodiment, in order to reduce the raw material to a greater extent, an included angle of the baffle plates 8 may be set to 60 °, and when six baffle plates 8 having an included angle of 60 ° are merged together, a complete shielding surface can be formed.

As shown in fig. 2 to 5, based on the same concept as the above embodiments, the present embodiment further provides a carrier ring 23 and a plurality of weights 24, the carrier ring 23 is sleeved on the sprue bush body 1, the weights 24 are connected to one side of the baffle 8 and slidably disposed on the carrier ring 23, and the plurality of weights 24 are in one-to-one correspondence with the baffle 8.

In this embodiment, in order to realize that baffle 8 has sufficient centrifugal force, can be equipped with balancing weight 24 for every baffle 8, balancing weight 24 off-centre setting is in one side of baffle 8, can guarantee like this that baffle 8 has great centrifugal force, in order to avoid the unsettled setting of balancing weight 24, has established carrier ring 23 at the cover on runner cover body 1 for bear balancing weight 24, balancing weight 24 can slide and set up on carrier ring 23.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.