Valve housing casting shakeout apparatus and method

Abstract

The application relates to the technical field of valve housing production, in particular to a valve housing casting shakeout equipment and method, which comprises a bottom plate, a shakeout box is fixedly installed on the upper surface of the bottom plate through a plurality of supporting legs, a plurality of air outlet holes are formed in the front and rear inner walls of the shakeout box, vibration units are installed on the front and rear surfaces of the shakeout box, a conveying unit for conveying sand is arranged directly below the shakeout box, a shakeout mechanism for shakeout of valve housings is arranged on the shakeout box, an auxiliary mechanism for auxiliary cleaning of sand storage in the valve housings is arranged on the outside of the shakeout box, the shakeout mechanism comprises a driving motor fixedly installed on the right side face of the shakeout box, a plurality of conveying rollers are uniformly distributed in a stepped manner in the inside of the shakeout box along the left-right direction, the setting of the shakeout mechanism can generate up-and-down stirring force on the valve during the conveying of the valve, the valve also generates vibration in the up-and-down direction during the shakeout, and the shakeout effect is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valve housing production, in particular to a valve housing casting shakeout equipment and method. BACKGROUND

[0002] Sand casting refers to a casting method for producing castings in a sand mold. Steel, iron and most non-ferrous alloy castings can be obtained by sand casting method. Because the molding material used in sand casting is cheap and easy to obtain, the mold manufacturing is simple, and it can adapt to single piece production, batch production and mass production of castings. When producing valve housings through sand casting, the valve housings casted need to use a shakeout equipment to separate the sand inside and on the surface of the valve housing from the valve housing.

[0003] When the valve housing is shaken out by the vibration conveying type shakeout equipment, the valve housing is usually placed on the shakeout equipment first, and then the sand inside and on the surface of the valve housing is separated from the valve housing by vibration of the shakeout equipment during conveying of the housing.

[0004] However, during the shakeout operation of the valve housing by the shakeout equipment, the following problems exist: 1. Incomplete shakeout: because the valve housing only translates during conveying, some sand inside the valve housing below the outlet position cannot be completely shaken out; 2. Low shakeout efficiency: the existing shakeout by vibration conveying only relies on vibration of the equipment itself to drive the valve housing to shake out, which requires a long time to fully shake out the sand inside the valve housing. SUMMARY

[0005] Therefore, the present application provides a valve housing casting shakeout equipment and method, which solves the above technical problems.

[0006] The valve housing casting shakeout equipment provided by the present application comprises a bottom plate, a shakeout box is fixedly installed on the upper surface of the bottom plate through a plurality of support legs, a plurality of air outlet holes are formed in the front and rear inner walls of the shakeout box, vibration units are installed on the front and rear surfaces of the shakeout box, a conveying unit for conveying sand is arranged directly below the shakeout box, a shakeout mechanism for shaking out the valve housing is arranged on the shakeout box, and an auxiliary mechanism for assisting in cleaning the sand inside the valve housing is arranged on the outside of the shakeout box.

[0007] The shakeout mechanism comprises a drive motor fixedly installed on the right side of the shakeout box, a plurality of conveying rollers are uniformly distributed in a stepped manner along the left-right direction inside the shakeout box, both ends of the conveying roller are penetratingly and rotatably connected with the shakeout box, and a buffer for transmission between the plurality of conveying rollers is arranged at both ends of the conveying roller outside the shakeout box.

[0008] The auxiliary mechanism comprises a special-shaped conveying pipe fixedly installed on the shakeout box, and an adjusting piece is arranged on the special-shaped conveying pipe to control the intermittent air outlet of the air outlet hole.

[0009] According to the embodiment of the present application, the front and rear inner walls of the shakeout box are provided with a plurality of staggered distribution of the dial plate corresponding to the stepped distribution of the conveying roller, and a torsion spring is arranged between the dial plate and the inner wall of the shakeout box.

[0010] According to the embodiment of the present application, the upper surface, the lower surface and the left side of the shakeout box are all provided with openings, and a downcomer plate with a left end downwardly inclined is fixedly installed on the left side of the shakeout box, the right end of the downcomer plate is located below the leftmost conveying roller, the cross section of the conveying roller in the left-right direction is in the shape of a cam, and a plurality of grooves are uniformly arranged on the outer surface of the conveying roller.

[0011] According to the embodiment of the present application, the buffer comprises a rotating disc fixedly connected to the conveying roller, two symmetrical mounting grooves are arranged on the circumferential surface of the rotating disc, a limiting slide rod is fixedly connected in the mounting groove, a connecting slide block is slidably connected to the circumferential surface of the limiting slide rod, and a double-row gear is rotatably connected to the circumferential surface of the rotating disc.

[0012] According to the embodiment of the present application, the left and right adjacent two double-row gears are connected through a chain transmission, the output shaft of the driving motor is fixedly connected with a gear disc, the gear disc is connected with the rightmost double-row gear through a chain transmission, and a protective shell for protecting the chain is fixedly installed on the front and rear surfaces of the shakeout box at positions corresponding to the plurality of double-row gears.

[0013] According to the embodiment of the present application, the inner circumferential surface of the double-row gear is fixedly connected with the two connecting slide blocks, and a return spring is sleeved on the circumferential surface of the limiting slide rod.

[0014] According to the embodiment of the present application, the adjusting piece comprises two groups of push rods uniformly distributed on the front and rear surfaces of the special-shaped conveying pipe, one end of the push rod close to the center of the shakeout box penetrates into the interior of the special-shaped conveying pipe and is fixedly connected with a convex plug, and the other end of each group of push rods away from the center of the shakeout box is fixedly connected with a linkage plate.

[0015] According to the embodiment of the present application, a plurality of electric push rods are fixedly connected below the linkage plate on the shakeout box, the telescopic end of the electric push rod is fixedly connected with the linkage plate through a connecting sheet, and the right upper surface of the special-shaped conveying pipe is provided with an interface connected with an external air pump.

[0016] According to the embodiment of the present application, the small-diameter end of the convex plug is matched with the size of the air outlet hole arranged on the shakeout box, and the positions of the plurality of convex plugs are matched with the positions of the plurality of air outlet holes arranged on the shakeout box.

[0017] A valve shell casting shakeout method, using the above shakeout equipment for shakeout of the valve shell, comprising the following steps: S1, first, the cast valve shell is placed into the shakeout box from the right end of the top, at this time the vibration unit works to generate vibration, the drive motor drives the conveying roller to rotate through the buffer to convey the valve shell left in the inside of the shakeout box.

[0018] S2, at this time, the external air pump equipment continuously supplies air to the inside of the special-shaped conveying pipe through the right end interface of the auxiliary mechanism, and the regulating member intermittently opens the air outlet hole on the shakeout box, so that the air is pressurized for a short time before being blown out, so that the air blowing force is greater.

[0019] S3, during the conveying process, the position of the valve shell can be adjusted when the valve shell passes through the push plate, so that the air blown out of the air outlet hole on the shakeout box can blow into different hole positions of the valve shell.

[0020] S4, during the conveying process, the sand on the valve shell falls downward through the conveying roller to the conveying unit, and the sand is conveyed to the right for unified recovery by the conveying unit, and the valve shell moves to the left end of the shakeout box and then slides downward through the discharge plate for unified collection.

[0021] The technical scheme of the application has the following advantages: 1. The irregular up-and-down vibration of the valve shell is generated during the conveying process by the stepped conveying roller and the cam-shaped design, and the position of the valve shell is adjusted by the staggered push plate, so that the sand in different positions inside the valve shell is fully removed. At the same time, the intermittent high-pressure airflow of the auxiliary mechanism is blown into the inside of the valve shell through the air outlet hole, further removing the residual sand, solving the problem of incomplete shakeout of the traditional equipment.

[0022] 2. The design of the buffer in the shakeout mechanism makes the driving of the multiple conveying rollers flexible and buffered, avoiding jamming caused by irregular shape or uneven weight of the valve shell, and ensuring continuous and efficient conveying. In addition, the intermittent pressurized airflow is quickly released by the regulating member, enhancing the airflow impact force, shortening the sand separation time, and significantly improving the overall efficiency.

[0023] 3. The grooves on the surface of the conveying roller can crush large pieces of sand during the conveying process, avoiding sand accumulation and blockage, and facilitating the unified recovery of sand by the conveying unit. The crushed sand particles are more uniform and can be directly used in the subsequent casting process, reducing sand waste and improving resource utilization. BRIEF DESCRIPTION OF DRAWINGS

[0024] 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 in the embodiments or prior art description. Obviously, the drawings in the following description only represent the embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative effort based on the provided drawings.

[0025] Figure 1 is a schematic diagram of the three-dimensional structure of the valve housing casting shakeout equipment provided by the present application.

[0026] Figure 2 is a schematic diagram of the three-dimensional structure of the shakeout mechanism provided by the present application.

[0027] Figure 3 is a schematic diagram of the three-dimensional structure of the transmission cooperation of two adjacent buffer members provided by the present application.

[0028] Figure 4 is a front view of the conveying roller provided by the present application.

[0029] Figure 5 is a schematic diagram of the three-dimensional structure of the buffer member provided by the present application.

[0030] Figure 6 is a schematic diagram of the three-dimensional structure of the auxiliary mechanism provided by the present application.

[0031] Figure 7 is a partial left view of the auxiliary mechanism provided by the present application.

[0032] Reference signs: 1, bottom plate; 2, conveying unit; 3, blanking plate; 4, shakeout box; 5, vibration unit; 6, shakeout mechanism; 7, auxiliary mechanism; 8, push plate; 61, driving motor; 62, protective shell; 63, conveying roller; 64, buffer member; 71, special-shaped conveying pipeline; 72, adjusting member; 641, double-row gear; 642, connecting sliding block; 643, limiting sliding rod; 644, rotating disc; 721, linkage plate; 722, push rod; 723, electric push rod; 724, convex plug. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned objects, features and advantages of the present application more apparent and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings. In the following description, a large number of specific details are set forth in order to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the concept of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0034] As Figure 1As shown in the figure, a valve housing casting shakeout equipment, including the bottom plate 1, the upper surface of the bottom plate 1 is fixedly installed with a shakeout box 4 through a plurality of support legs, a plurality of air outlets are formed on the front and rear inner walls of the shakeout box 4, a vibration unit 5 is installed on the front and rear surfaces of the shakeout box 4, a conveying unit 2 for conveying sand is arranged below the shakeout box 4 (a common belt conveyor is used in the invention to convey sand), a shakeout mechanism 6 for shakeout of the valve housing is arranged on the shakeout box 4, and an auxiliary mechanism 7 for auxiliary cleaning of the sand stored in the valve housing is arranged on the outside of the shakeout box 4.

[0035] As shown in Figure 1 , Figure 2 , Figure 3 and Figure 4 , the shakeout mechanism 6 includes a drive motor 61 fixedly installed on the right side of the shakeout box 4, a plurality of conveying rollers 63 are uniformly distributed in a stepped manner along the left-right direction inside the shakeout box 4, the upper surface, the lower surface and the left side of the shakeout box 4 are all open, a discharge plate 3 with the left end inclined downward is fixedly installed on the left side of the shakeout box 4, the right end of the discharge plate 3 is located below the leftmost conveying roller 63, the cross section of the conveying roller 63 in the left-right direction is in the shape of a cam, a plurality of grooves are uniformly formed on the outer surface of the conveying roller 63, the conveying roller 63 is penetratingly and rotatably connected with the shakeout box 4 at both ends, the two ends of the conveying roller 63 located outside the shakeout box 4 are both provided with a buffer 64 for transmission between the plurality of conveying rollers 63, a plurality of staggered distribution of the push plates 8 are arranged on the front and rear inner walls of the shakeout box 4 corresponding to the stepped distribution of the conveying rollers 63, a torsion spring (not shown in the figure) is arranged between the push plate 8 and the inner wall of the shakeout box 4, and the push plate 8 is in an inclined state under normal conditions.

[0036] As shown in Figure 1 and Figure 6 , the auxiliary mechanism 7 includes a special-shaped conveying pipe 71 fixedly installed on the shakeout box 4, and the special-shaped conveying pipe 71 is provided with an adjusting piece 72 for controlling the intermittent air outlet of the air outlet.

[0037] In specific use, first, the valve housing completed by casting is placed into the shakeout box 4 from above the right end, at this time the vibration unit 5 works to generate vibration, the drive motor 61 drives the conveying roller 63 to rotate through the buffer 64 to convey the valve housing in the inside of the shakeout box 4 from right to left, cooperating with the cam shape of the conveying roller 63, when conveying the valve housing, the valve housing itself generates intermittent displacement in the up-down direction, at the same time, the stepped distribution of the conveying roller 63 can adjust the valve housing at any position after falling through the step difference when conveying the valve housing to the left through the step connection position, so that the sand in the valve housing can be more thoroughly dropped out.

[0038] Meanwhile, the external air pump device continuously supplies air to the inside of the special-shaped conveying pipe 71 through the right end of the auxiliary mechanism 7, and the air is intermittently blown out of the air outlet holes on the shakeout box 4 in cooperation with the adjusting part 72. The air is pressurized for a short time before being blown out, so that the blowing force of the air is greater. During the conveying of the valve housing, the position of the valve housing can be adjusted when the valve housing passes the toggle plate 8, so that the air blown out of the air outlet holes on the shakeout box 4 can blow into different hole positions of the valve housing. During the conveying of the valve housing, the sand on the valve housing falls downward through the conveying rollers 63 to the conveying unit 2, and the sand is conveyed to the right by the conveying unit 2 for unified recovery. After the valve housing moves to the leftmost end of the shakeout box 4, it slides downward through the discharge plate 3 for unified collection.

[0039] As shown in Figure 2 , Figure 3 , Figure 4 and Figure 5 , the buffer 64 includes a rotating disc 644 fixedly connected to the conveying roller 63. Two symmetrical mounting grooves are formed in the circumferential surface of the rotating disc 644 (not fully shown in the figure). A limiting slide rod 643 is fixedly connected inside the mounting groove. A connecting slide block 642 is slidingly connected to the circumferential surface of the limiting slide rod 643. A double-row gear 641 is rotatably connected to the circumferential surface of the rotating disc 644.

[0040] As shown in Figure 2 , Figure 3 , Figure 4 and Figure 5 , the two double-row gears 641 adjacent to each other are connected through a chain transmission. The output shaft of the driving motor 61 is fixedly connected with a toothed disc, which is connected with the rightmost double-row gear 641 through a chain transmission. The front and back surfaces of the shakeout box 4 are fixedly provided with a protection shell 62 for protecting the chain at positions corresponding to the double-row gears 641. The inner circumferential surface of the double-row gear 641 is fixedly connected with the two connecting slide blocks 642. A return spring is sleeved on the circumferential surface of the limiting slide rod 643.

[0041] In specific use, when the conveying roller 63 is driven to rotate by the buffer 64, the plurality of double-row gears 641 are connected through a chain transmission, so that the plurality of conveying rollers 63 rotate synchronously inside the shakeout box 4. During the rotation of the conveying roller 63, the separated large pieces of sand are crushed through the grooves on the conveying roller 63. Then the sand falls along the gap between the conveying rollers 63. When the conveying roller 63 rotates and conveys the valve housing to the left, the protruding part on the conveying roller 63 contacts the valve housing, which pushes the valve housing to move upward. When the protruding part moves away from the valve housing, the valve housing moves downward. The upward and downward vibration separates the sand in the valve housing more thoroughly.

[0042] When the protrusions on the conveying rollers 63 come into contact with the valve housing, the valve housing will generate resistance to the conveying rollers 63 due to its own weight, and since the valve housing is irregularly shaped, the protrusions of the plurality of conveying rollers 63 will not come into contact with the valve housing at the same time, at this time, the double gear 641 continues to rotate to drive the connecting slider 642 to slide on the limiting slide rod 643, and the return spring is compressed, when the connecting slider 642 slides to the other end of the limiting slide rod 643, the connecting slider abuts against one end of the installation groove on the rotating disc 644, as the double gear 641 continues to rotate, at this time, the double gear 641 starts to drive the rotating disc 644 to rotate, the rotating disc 644 drives the conveying roller 63 to rotate, at the same time, the valve housing is pushed upward by the protrusions on the conveying roller 63, the conveying rollers 63 at different positions come into contact with the valve housing at different time points, the double gear 641 drives the conveying roller 63 to start to rotate at different time points, and the protrusions of the conveying rollers 63 at different positions start to push the valve housing at different time points, therefore, the valve housing can move irregularly in the upward and downward directions during conveying, and the sand can be separated from the valve housing more quickly.

[0043] As shown in Figure 6 and Figure 7 , the adjusting piece 72 includes two groups of push rods 722 uniformly distributed on the front and rear surfaces of the special-shaped conveying pipe 71, one end of each push rod 722 close to the center of the sand box 4 penetrates into the inside of the special-shaped conveying pipe 71 and is fixedly connected with a convex plug 724, and one end of each group of push rods 722 away from the center of the sand box 4 is fixedly connected with a linkage plate 721, a plurality of electric push rods 723 are fixedly connected below the linkage plate 721 on the sand box 4, the extension end of the electric push rod 723 is fixedly connected with the linkage plate 721 through a connecting sheet, an interface connected with an external air pump is arranged on the right upper surface of the special-shaped conveying pipe 71, the small-diameter end of the convex plug 724 is adapted in size to the size of the air outlet hole arranged on the sand box 4, and the positions of the plurality of convex plugs 724 correspond to the positions of the plurality of air outlet holes arranged on the sand box 4 one by one.

[0044] In specific use, when the gas is continuously conveyed into the inside of the special-shaped conveying pipe 71 through the interface on the special-shaped conveying pipe 71, at this time, the electric push rod 723 is retracted to drive the linkage plate 721 to move towards the special-shaped conveying pipe 71, at this time, the small-diameter end of the convex plug 724 is inserted into the inside of the air outlet hole on the sand box 4, the air is continuously conveyed into the inside of the special-shaped conveying pipe 71, at this time, the air pressure in the inside of the special-shaped conveying pipe 71 gradually increases, the electric push rod 723 is extended, the convex plug 724 is pulled away from the air outlet hole by the linkage plate 721 cooperating with the push rod 722, at this time, the high-pressure gas is rapidly sprayed through the air outlet hole and blown on the valve housing, part of the air enters into the inside of the valve housing through the opening on the valve housing to blow out the sand inside.

[0045] As Figure 1 , Figure 2 and Figure 6 illustrated, a valve housing casting shakeout method, using a shakeout device to shake out the valve housing, comprising the following steps: S1, first, the cast valve housing is placed into the right end from above the shakeout box 4, at this time the vibration unit 5 works to generate vibration, the drive motor 61 drives the conveying roller 63 to rotate through the buffer 64 to convey the valve housing left inside the shakeout box 4.

[0046] S2, at this time, the external air pump device continuously inputs air into the special-shaped conveying pipe 71 through the right end interface of the auxiliary mechanism 7, and the adjusting piece 72 intermittently opens the air outlet hole of the shakeout box 4, so that the air is pressurized for a short time before being blown out, so that the air blowing force is greater.

[0047] S3, during the conveying process, by the setting of the push plate 8, the position of the valve housing can be adjusted when the valve housing passes through the push plate 8, so that the air blown out of the air outlet hole of the shakeout box 4 can be blown into different hole positions of the valve housing.

[0048] S4, during the conveying process of the valve housing, the sand on the valve housing falls downward to the conveying unit 2 through the conveying roller 63, and the sand is conveyed to the right for unified recovery through the conveying unit 2, and the valve housing moves to the leftmost end of the shakeout box 4 and then slides downward through the discharge plate 3 for unified collection.

[0049] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0050] In addition, the terms "first", "second", "one", "two" are only for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", "one", "two" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0051] In this application, unless otherwise clearly indicated and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise clearly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0052] The embodiments of the specific implementation are the preferred embodiments of the application, not to limit the protection scope of the application, therefore: any equivalent changes made according to the structure, shape, principle of the application should be covered within the protection scope of the application.

Claims

1. A valve body casting sand removal device, comprising a base plate, a sand removal box fixedly mounted on the base plate by multiple support legs, multiple air outlets being provided on the front and rear inner walls of the sand removal box, vibration units being installed on the front and rear surfaces of the sand removal box, and a conveying unit for conveying sand being provided directly below the sand removal box, characterized in that: The sand dropping box is provided with a sand dropping mechanism for dropping sand on the valve housing, and the outer side of the sand dropping box is provided with an auxiliary mechanism for assisting in cleaning the sand stored in the valve housing. The sand dropping mechanism comprises a driving motor fixedly installed on the right side of the sand dropping box, a plurality of conveying rollers with cam-shaped cross sections are uniformly distributed in a stepped manner along the left-right direction inside the sand dropping box, and the outer surfaces of the conveying rollers are uniformly provided with a plurality of grooves, both ends of each conveying roller are penetratingly and rotatably connected with the sand dropping box, and a buffer is arranged at both ends of each conveying roller for transmission between the conveying rollers. The auxiliary mechanism comprises a special-shaped conveying pipe fixedly installed on the sand dropping box, and the special-shaped conveying pipe is provided with an adjusting piece for controlling the intermittent air outlet of the air outlet hole. The front and rear inner walls of the sand dropping box are provided with a plurality of staggered distribution of the dial plate corresponding to the stepped distribution of the conveying roller, and a torsion spring is arranged between the dial plate and the inner wall of the sand dropping box. The sand dropping mechanism is completed by the vibration conveying of the conveying roller, the adjustment of the valve housing position by the dial plate, and the intermittent high-pressure airflow impact.

2. A valve housing casting knockout apparatus as defined in claim 1, wherein: The upper surface, lower surface and left side of the sand dropping box are all provided with openings, and a left end downwardly inclined discharging plate is fixedly installed on the left side of the sand dropping box, and the right end of the discharging plate is located below the leftmost conveying roller.

3. A valve housing casting knockout apparatus as defined in claim 1 wherein: The buffer comprises a rotating disc fixedly connected with the conveying roller, two symmetrical installation grooves are formed in the circumferential surface of the rotating disc, a limiting slide rod is fixedly connected in the installation groove, a connecting slide block is slidably connected with the circumferential surface of the limiting slide rod, and a double-row gear is rotatably connected with the circumferential surface of the rotating disc.

4. A valve housing casting knockout apparatus as defined in claim 3 wherein: The double-row gears adjacent to each other are connected through a chain transmission, the output shaft of the driving motor is fixedly connected with a gear disc, the gear disc and the rightmost double-row gear are connected through a chain transmission, and a protective shell for protecting the chain is fixedly installed on the front and rear surfaces of the sand dropping box at positions corresponding to the plurality of double-row gears.

5. A valve housing casting knockout apparatus as defined in claim 3 wherein: The inner circumferential surface of the double-row gear is fixedly connected with the two connecting slide blocks, and a return spring is sleeved on the circumferential surface of the limiting slide rod.

6. A valve housing casting knockout apparatus as defined in claim 1 wherein: The adjusting piece comprises two groups of push rods uniformly distributed on the front and rear surfaces of the special-shaped conveying pipe, one end of each push rod close to the center of the sand dropping box penetrates into the interior of the special-shaped conveying pipe and is fixedly connected with a convex plug, and one end of each group of push rods away from the center of the sand dropping box is fixedly connected with a linkage plate.

7. A valve housing casting knockout apparatus as defined in claim 6 wherein: A plurality of electric push rods are fixedly connected below the linkage plate on the sand dropping box, the extension end of the electric push rod is fixedly connected with the linkage plate through a connecting sheet, and an interface connected with an external air pump is arranged on the right upper surface of the special-shaped conveying pipe.

8. A valve housing casting knockout apparatus as defined in claim 6 wherein: The small-diameter end of the convex plug is matched with the size of the air outlet hole formed on the sand dropping box, and the positions of the plurality of convex plugs correspond to the positions of the plurality of air outlet holes formed on the sand dropping box.

9. A method of casting and stripping a valve housing using the apparatus of claim 1, wherein, Specifically comprising the following steps: S1, first, the cast valve housing is placed into the sand dropping box from the right end of the sand dropping box, at this time the vibration unit works to generate vibration, the driving motor drives the conveying roller to rotate through the buffer to convey the valve housing to the left in the sand dropping box; S2, at this time, the external air pump device continuously supplies air to the inside of the special-shaped conveying pipe through the right end interface of the auxiliary mechanism, and the regulating member intermittently opens the air outlet hole on the shakeout box, so that the air is pressurized for a short time before being blown out, so that the blowing air has greater force; S3, during the conveying process, by the setting of the push plate, the position of the valve shell can be adjusted when the valve shell passes through the push plate, so that the air blown out of the air outlet hole on the shakeout box can be blown into different hole positions of the valve shell; S4, during the conveying process, the sand on the valve shell falls downward to the conveying unit through the conveying roller, and the sand is conveyed to the right through the conveying unit for unified recovery, and the valve shell moves to the leftmost end of the shakeout box and then slides downward through the discharging plate for unified collection.

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