A casting device for valve fitting production

Abstract

This invention discloses a casting apparatus for valve fitting production, relating to the field of valve fitting casting. The invention includes: an upper mold and a lower mold; the upper mold has an inlet channel and a spray channel internally, connected by an opening and closing assembly; an exhaust module, horizontally slidably inserted into the upper mold and engaging with a beveled protrusion fixedly connected to the lower mold; an airflow regulating module is fixedly attached to the side wall of the exhaust module by adjusting bolts, the airflow regulating module having a variable cross-section conical needle plate inserted into the exhaust channel, changing the insertion depth of the variable cross-section conical needle plate within the exhaust channel, thereby changing the effective flow cross-sectional area of ​​the exhaust channel; and a bellows-type liquid extraction element disposed on the upper mold. Before mold closing, the mechanical force of mold closure automatically extracts and sprays a release agent; simultaneously, a reciprocating slide and a swinging slider drive the upper mold to rotate, achieving uniform rotational spraying of the release agent onto the cavity surface instantaneously before mold closing.

Description

Technical Field

[0001] This invention relates to the field of valve fitting casting, specifically a casting apparatus for valve fitting production. Background Technology

[0002] In the sand casting or metal mold casting production process of valve fittings, a large amount of air will be stored in the cavity after the mold is closed. If this air cannot be discharged in time before or at the beginning of pouring, the high-temperature molten metal will compress the gas after entering the cavity, resulting in defects such as porosity, cold shut or insufficient filling in the casting.

[0003] Existing solutions typically involve creating fixed venting grooves on the parting surface. However, fixed venting grooves are prone to being blocked by splashed molten metal at the moment of mold closing, and the venting efficiency is not adjustable. In addition, to facilitate the demolding of castings, a release agent needs to be sprayed into the cavity manually or by an external robotic arm after each mold opening and before mold closing. This external spraying method not only increases the production cycle time, but also makes it difficult to evenly distribute the release agent on the curved surface of the cavity at the moment before mold closing due to the fixed nozzle position. Summary of the Invention

[0004] The purpose of this invention is to provide a casting device for valve fitting production, in order to solve the problem that fixed venting grooves are easily blocked by splashed molten metal at the moment of mold closing, and the venting efficiency is not adjustable.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a casting apparatus for valve fitting production, comprising:

[0006] The upper mold, lower mold, support frame, and drive source are provided. The output end of the drive source is rotatably connected to the upper mold via a bearing. After the upper mold and lower mold are closed, they form a valve body forming cavity. The drive source is one of an electric push rod, a pneumatic push rod, and a hydraulic push rod. The drive source is fixedly installed on the top of the support frame. The output end of the drive source is rotatably connected to the top of the upper mold via a bearing, so that the upper mold can swing relative to the lower mold.

[0007] The upper mold is equipped with a liquid inlet channel and a liquid spraying channel. The liquid inlet channel and the liquid spraying channel are connected by an opening and closing component. There are two liquid inlet channels corresponding to two bellows liquid pumping elements. There are two sets of two liquid spraying channels in each set. The two liquid spraying channels are symmetrically arranged inside the upper mold. At the same time, the inlet of the liquid spraying channel is aligned with the two exhaust inlets of the exhaust module. The outlet of the liquid spraying channel extends in an arc along the circumference of the upper mold to form a semi-circular structure to cover the inclined guide section. The liquid spraying channel also includes a liquid spraying outlet arranged downward along the extension path. The liquid spraying channel forms a fully connected arrangement of the liquid spraying outlet.

[0008] The exhaust module is horizontally slidably inserted into the interior of the upper mold and abuts against the inclined protrusion fixedly connected to the lower mold. The exhaust module is elastically engaged with the upper mold through a return spring so that it can return to its original position after the internal thrust is lost.

[0009] The side wall of the exhaust module is fixed with an airflow regulating module by adjusting bolts. The airflow regulating module has a variable cross-section conical needle plate that is inserted into the exhaust channel. The insertion depth of the variable cross-section conical needle plate in the exhaust channel is changed by adjusting bolts, thereby changing the effective flow cross-sectional area of ​​the exhaust channel.

[0010] The side wall of the airflow regulating module is provided with a vertical adjustment groove. The adjustment bolt can slide in the adjustment groove to realize the height adjustment of the airflow regulating module. When it is necessary to change the airflow efficiency, the airflow regulating module is adjusted upward and locked by the adjustment bolt to increase the exhaust efficiency. Conversely, the airflow regulating module is adjusted downward and locked by the adjustment bolt to reduce the exhaust efficiency.

[0011] Among them, there are multiple variable cross-section tapered needle plates, each corresponding to the top outlet of the exhaust module;

[0012] During the final stage of the upper mold closing motion, the opening and closing component is driven by the exhaust module to close the liquid inlet channel and discharge the gas inside the mold through the exhaust channel inside the exhaust module.

[0013] A corrugated pipe liquid extraction element is installed on the upper mold. The inlet end of the corrugated pipe liquid extraction element is unidirectionally connected to the liquid storage container, and the outlet end of the corrugated pipe liquid extraction element is unidirectionally connected to the liquid inlet channel. When the upper mold moves downwards and approaches the front section of the lower mold closing, the corrugated pipe liquid extraction element is compressed by the lower mold and delivers the extracted release agent to the spraying channel.

[0014] As a further embodiment of the present invention: the opening and closing assembly includes a conduit with a sealing surface and a hollow bracket fixed inside the conduit, wherein a sliding rod is slidably connected inside the hollow bracket, a sealing plug is fixedly connected to the top of the sliding rod, and the bottom of the sliding rod is slidably engaged with the exhaust module.

[0015] As a further embodiment of the present invention: the insertion end of the exhaust module has a movable groove adapted to the slide rod, and an inclined slide groove is provided on the inner wall of the movable groove, and the slide rod is slidably installed in the inclined slide groove by a slider.

[0016] As a further embodiment of the present invention: when the exhaust module is pushed inward by the inclined protrusion, it causes the slide rod to move upward and close the liquid injection channel at the same time. When the exhaust module is disengaged from the inclined protrusion, it resets outward and causes the slide rod to move downward to open the liquid inlet channel and the liquid injection channel.

[0017] As a further embodiment of the present invention: the lower mold has an inwardly extending vertical gathering section and an inclined guiding section at the opening of the molding cavity, and the upper mold has a closed structure adapted to the vertical gathering section and the inclined guiding section, and the release agent sprayed by the spray channel falls directly into the inclined guiding section and flows downward along the molding cavity of the lower mold.

[0018] As a further aspect of the present invention: the exhaust gap formed between the closed structure and the inclined guide section gradually expands along the exhaust direction, and the exhaust channel is configured to allow gas to be discharged and block the molding material.

[0019] As a further embodiment of the present invention: the inlet pipe of the corrugated pipe liquid extraction element is provided with an inlet check valve, the outlet pipe of the corrugated pipe liquid extraction element is provided with an outlet check valve, and the inner top wall and the inner bottom wall of the corrugated pipe liquid extraction element are fixedly connected by a telescopic column spring.

[0020] As a further embodiment of the present invention: a side-drawing hole mold core is slidably installed on the inner side wall of the lower mold, the fixed end of the side-drawing hole mold core is elastically engaged with the lower mold through a tension spring, the fixed end of the side-drawing hole mold core is connected to a sloping push rod, and a push plate is fixedly connected to the bottom of the upper mold. After the push plate abuts against the sloping push rod, it pushes the side-drawing hole mold core into the valve body forming cavity.

[0021] As a further embodiment of the present invention: the side wall of the push plate is provided with a reciprocating slide groove, and the inner side wall of the lower mold is fixedly connected with a swing slider. When the push plate moves relative to the swing slider, it can drive the upper mold to rotate and spray the release agent.

[0022] As a further embodiment of the present invention: the reciprocating slide includes vertical slide sections located at the top and bottom and a reciprocating curved slide between the two vertical slide sections.

[0023] This invention also discloses a casting apparatus for manufacturing valve fittings, which includes the following steps:

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. By setting the corrugated pipe liquid extraction element in conjunction with the opening and closing components and the exhaust module, the release agent is automatically extracted and sprayed by the mechanical force of the mold closing before the mold is closed, eliminating the need for external robotic arms and manual operation, and shortening the production cycle; at the same time, the reciprocating slide and the swing slider drive the upper mold to rotate, realizing the uniform rotational spraying of the release agent on the cavity surface instantly before the mold is closed.

[0026] 2. By setting the exhaust module and the inclined protrusion to cooperate, the exhaust channel is automatically opened at the end of the mold closing stage to exhaust the air. An airflow adjustment module with a variable cross-section conical needle plate is set on the side wall of the exhaust module. The exhaust cross-sectional area can be precisely adjusted by adjusting the bolt to adapt to the exhaust requirements under different pouring speeds, and avoid the metal liquid from spraying out due to excessive exhaust or the porosity defect caused by excessive exhaust.

[0027] 3. The enlarged venting gap is formed between the closed structure and the inclined guide section. Combined with the venting channel that only allows gas to pass through while blocking the molding material, it not only ensures the smooth discharge of gas in the cavity and eliminates porosity defects, but also prevents molten metal from escaping from the vent.

[0028] 4. By cooperating with the push plate at the bottom of the upper mold and the inclined ejector rod in the lower mold, the side-pulling hole core is directly pushed out during the mold closing process to form the forming structure of the valve side hole. No additional hydraulic or pneumatic core-pulling cylinder is required, which simplifies the mold structure. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 This is a schematic diagram of the main structure of the present invention;

[0031] Figure 3 This is a side view of the structure of the present invention;

[0032] Figure 4 This is a schematic diagram of the opening / closing component and the exhaust module of the present invention;

[0033] Figure 5 This is a schematic diagram of the front cross-sectional structure of the present invention;

[0034] Figure 6 For the present invention Figure 5 Enlarged structural diagram at point A in the middle;

[0035] Figure 7 This is a schematic cross-sectional view of the exhaust module and opening / closing assembly of the present invention.

[0036] Figure 8 This is a partial cross-sectional structural diagram of the upper and lower molds of the present invention;

[0037] Figure 9 This is a schematic diagram of the structure of the bellows-type liquid pumping element of the present invention.

[0038] In the diagram: 1. Upper mold; 11. Liquid inlet channel; 12. Liquid spraying channel; 13. Enclosed structure; 14. Drive source; 15. Support frame;

[0039] 2. Lower mold; 21. Angled protrusion; 22. Angled guide section; 23. Vertical gathering section; 24. Side extraction hole core; 25. Tension spring; 26. Angled ejector pin; 27. Push plate; 28. Reciprocating slide; 281. Vertical slide; 282. Reciprocating curved slide; 29. ​​Swinging slider;

[0040] 3. Exhaust module; 31. Exhaust passage; 32. Inclined slide groove; 33. Adjusting bolt; 34. Airflow regulating module; 35. Variable cross-section conical needle plate; 36. Return spring;

[0041] 4. Opening and closing assembly; 41. Conduit; 42. Hollowed-out bracket; 43. Slide rod; 44. Sealing plug; 45. Slider;

[0042] 5. Bellows pumping element; 51. Inlet check valve; 52. Outlet check valve; 53. Storage container; 54. Telescopic spring. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments of the invention based on its overall structure.

[0045] Example 1

[0046] Please see Figures 1-9This embodiment provides a casting apparatus for valve fitting production, comprising:

[0047] The upper mold 1, lower mold 2, support frame 15, and drive source 14 are provided. The output end of drive source 14 is rotatably connected to upper mold 1 via bearing. After upper mold 1 and lower mold 2 are closed, the interior forms a valve body forming cavity. Specifically, drive source 14 is one of electric push rod, pneumatic push rod, and hydraulic push rod. Drive source 14 is fixedly installed on the top of support frame 15. The output end of drive source 14 is rotatably connected to the top of upper mold 1 via bearing, so that upper mold 1 can swing relative to lower mold 2. Lower mold 2 is fixed in the middle of support frame 15 and arranged concentrically with upper mold 1 to achieve precise alignment of upper mold 1 and lower mold 2.

[0048] The upper mold 1 is provided with a liquid inlet channel 11 and a liquid spraying channel 12 inside, which are connected by an opening and closing component 4. The liquid inlet channel 11 and the liquid spraying channel 12 are both located inside the upper mold 1. The liquid inlet channel 11 consists of two channels corresponding to two bellows-shaped liquid extraction elements 5. The liquid spraying channel 12 consists of two groups of two channels each. The two liquid spraying channels 12 are symmetrically arranged inside the upper mold 1. The inlet of the liquid spraying channel 12 is aligned with the two exhaust inlets of the exhaust module 3. The outlet of the liquid spraying channel 12 extends in an arc along the circumference of the upper mold 1 to form a semi-circular structure to cover the inclined guide section 22. The liquid spraying channel 12 also includes a liquid spraying outlet arranged downward along the extension path. The liquid spraying channel 12 forms a fully connected arrangement of the liquid spraying outlet.

[0049] The exhaust module 3 is horizontally slidably inserted into the interior of the upper mold 1 and abuts against the inclined protrusion 21 fixedly connected to the lower mold 2. The exhaust module 3 is elastically engaged with the upper mold 1 through the return spring 36 so that it can return to its original position after losing the internal thrust. The exhaust module 3 (which can be designed as a high-temperature resistant graphite or alloy slider) has an exhaust channel 31 inside (which can be configured as multiple micro-holes or slits).

[0050] The exhaust module 3 has an airflow regulating module 34 fixed to its side wall by adjusting bolts 33. The airflow regulating module 34 has a variable cross-section conical needle plate 35 that is inserted into the exhaust channel 31. The insertion depth of the variable cross-section conical needle plate 35 in the exhaust channel 31 is changed by adjusting bolts 33, thereby changing the effective flow cross-sectional area of ​​the exhaust channel 31. The side wall of the airflow regulating module 34 has a vertical adjusting groove. The adjusting bolts 33 can slide in the adjusting groove to adjust the height of the airflow regulating module 34. When it is necessary to change the airflow efficiency, the airflow regulating module 34 is adjusted upward and locked by adjusting bolts 33 to increase the exhaust efficiency. Conversely, the airflow regulating module 34 is adjusted downward and locked by adjusting bolts 33 to reduce the exhaust efficiency.

[0051] Among them, there are multiple variable cross-section tapered needle plates 35, which correspond to the top outlet of the exhaust module 3 respectively;

[0052] When the upper mold 1 is in the final stage of closing motion, the opening and closing component 4 is driven by the exhaust module 3 to close the liquid inlet channel 11 and discharge the gas in the mold through the exhaust channel 31 inside the exhaust module 3.

[0053] The corrugated pipe liquid extraction element 5 is installed on the upper mold 1. The inlet end of the corrugated pipe liquid extraction element 5 is unidirectionally connected to the liquid storage container 53, and the outlet end of the corrugated pipe liquid extraction element 5 is unidirectionally connected to the liquid inlet channel 11. When the upper mold 1 moves downwards and approaches the front section of the lower mold closing, the corrugated pipe liquid extraction element 5 is compressed by the lower mold 2 and transports the extracted release agent to the spray channel 12.

[0054] Example 2

[0055] The opening and closing assembly 4 includes a conduit 41 with a sealing surface and a hollow bracket 42 fixed inside the conduit 41. A slide rod 43 is slidably connected inside the hollow bracket 42. A sealing plug 44 is fixedly connected to the top of the slide rod 43. The bottom of the slide rod 43 is slidably engaged with the venting module 3. The hollow bracket 42 has multiple slots to facilitate the direct downward flow of the release agent. The middle part of the hollow bracket 42 is a sliding hole. The slide rod 43 is slidably inserted into the sliding hole to maintain its up and down movement. The sealing plug 44 is a high-temperature resistant rubber structure. Its side wall also has an inwardly recessed groove, and an elastic sealing ring is snapped into the groove to ensure the effectiveness of the seal during sealing.

[0056] The insertion end of the exhaust module 3 has a movable groove that matches the slide rod 43. An inclined slide groove 32 is provided on the inner wall of the movable groove. The slide rod 43 is slidably installed in the inclined slide groove 32 through the slider 45. The inclined slide groove 32 gradually decreases from the outside of the upper mold 1 to the inside of the upper mold, so as to ensure that when the exhaust module 3 moves inward, it pushes the slide rod 43 to move upward, and conversely, when it moves outward, it pulls the slide rod 43 to move downward, so as to realize the conversion of horizontal movement into vertical linear movement.

[0057] When the exhaust module 3 is pushed inward by the inclined protrusion 21, it drives the slide rod 43 to move upward and closes the liquid injection channel 12. When the exhaust module 3 is disengaged from the inclined protrusion 21, it resets outward and drives the slide rod 43 to move downward, opening the liquid inlet channel 11 and the liquid injection channel 12.

[0058] The inclined protrusion 21 is annular and is fixedly installed on the top of the lower mold 2, so that it can abut against the exhaust module 3 in any position. Specifically, the inner wall of the inclined protrusion 21 is an inclined structure that slopes down from the outside to the inside, and the surface of the exhaust module 3 that abuts against the inclined protrusion 21 is adapted to the inclined surface of the inclined protrusion 21.

[0059] The exhaust module 3 is elastically engaged with the upper mold 1 through the return spring 36. After the inclined protrusion 21 abuts against the exhaust module 3, the exhaust module 3 moves inward. At this time, the return spring 36 is in a compressed state. After the extrusion force is lost, the return spring 36 can provide the exhaust module 3 with elastic potential energy to move outward, thereby realizing automatic reset.

[0060] The lower mold 2 has an inwardly extending vertical gathering section 23 and an inclined guide section 22 at the opening of the molding cavity. The upper mold 1 has a closed structure 13 that is adapted to the vertical gathering section 23 and the inclined guide section 22. The release agent sprayed by the spray channel 12 falls directly into the inclined guide section 22 and flows downward along the molding cavity of the lower mold 1.

[0061] The exhaust gap formed between the closed structure 13 and the inclined guide section 22 gradually expands along the exhaust direction, and the exhaust channel 31 is configured to allow gas to be discharged and block the molding material.

[0062] Specifically, after the upper mold 1 and the lower mold 2 are closed, a valve body forming cavity is formed inside. The lower mold 2 has a vertical gathering section 23 and an inclined guide section 22 at the opening of the forming cavity. The upper mold 1 has a corresponding closing structure 13. When the mold is closed, the closing structure 13 fits into the inclined guide section 22. Due to the matching shape, a tiny venting gap is formed between the two (the gap value is usually between 0.05mm and 0.15mm). This gap gradually widens along the venting direction (upward), which is conducive to the discharge of gas and can prevent the molten metal from penetrating.

[0063] Example 3

[0064] The inlet pipe of the bellows-type liquid extraction element 5 is equipped with an inlet check valve 51, and the outlet pipe of the bellows-type liquid extraction element 5 is equipped with an outlet check valve 52. The inner top wall and the inner bottom wall of the bellows-type liquid extraction element 5 are fixedly connected by a telescopic column spring 54.

[0065] The side wall of the lower mold 2 first contacts and compresses the bellows pumping element 5. The bellows contracts under pressure, reducing its internal volume. The outlet check valve 52 opens and the inlet check valve 51 closes, allowing the demolding liquid extracted in the previous cycle to be forced into the inlet channel 11 through the outlet pipe and sprayed out through the spray channel 12. The demolding liquid falls directly into the inclined guide section 22 and flows evenly downwards along the inner wall of the molding cavity of the lower mold 2. The bellows pumping element 5 moves upwards with the upper mold 1 and is released from the pressure of the lower mold 2. Under the action of the telescopic column spring 54, it returns to its original position and expands, generating negative pressure inside. The inlet check valve 51 opens and the outlet check valve 52 closes, drawing demolding liquid from the storage container 53 to prepare for the next spraying.

[0066] The inner wall of the lower mold 2 is also slidably installed with a side-drawing hole mold core 24. The fixed end of the side-drawing hole mold core 24 is elastically engaged with the lower mold 2 through a tension spring 25. The fixed end of the side-drawing hole mold core 24 is connected to a sloping push rod 26. The bottom of the upper mold 1 is fixedly connected to a push plate 27. After the push plate 27 abuts against the sloping push rod 26, it pushes the side-drawing hole mold core 24 into the valve body forming cavity.

[0067] Specifically, the telescopic column spring 54 includes a hollow column and a telescopic rod inserted into the hollow column. The telescopic rod and the hollow column are connected by a column spring. After the bellows pumping unit 5 is compressed, the telescopic column spring 54 provides the bellows pumping unit 5 with elastic potential energy for reset. At the same time, since the telescopic column spring 54 can only move vertically, the bellows pumping unit 5 will not be twisted. The bottom and top of the bellows pumping unit 5 are made of hard metal material, and the middle is an elastic bellows structure. In order to reduce the overall wear of the bellows pumping unit 5, a ball bearing can be installed at the bottom of the bellows pumping unit 5 to convert horizontal oscillation into rolling friction, which can directly reduce the overall wear of the bellows pumping unit 5 and extend the service life of the bellows pumping unit 5.

[0068] The side-drawing core 24 is elastically engaged with the lower mold 2 via a tension spring 25. When the push plate 27 moves downward and is about to reach the end of its stroke, it abuts against the inclined push rod 26, thereby pushing the side-drawing core 24 to be inserted into the valve body forming cavity in the horizontal direction. After the side-drawing core 24 is inserted, the side opening can be completed directly during casting. When the push plate 27 moves upward, the side-drawing core 24 loses the extrusion force and automatically resets outward under the elastic potential energy of the tension spring 25, which facilitates the removal of the formed valve body later. The lower mold plate 2 is provided with an arc-shaped movable groove for the push plate 27 to swing.

[0069] The bottom of the push plate 27 is a sloping structure that slopes from the inside to the outside. The sloping push rod 26 is adapted to the sloping surface of the push plate 27, thereby converting the vertical movement into the horizontal movement. The lower mold 2 has an movable groove adapted to the side-pulling core 24. When the side-pulling core 24 is fully extended, it is precisely closed with the lower mold 2, and the poured molten metal will not overflow through the gap between the two.

[0070] The side wall of the push plate 27 is provided with a reciprocating slide groove 28, and the inner side wall of the lower mold 2 is fixedly connected with a swing slider 29. When the push plate 27 moves relative to the swing slider 29, it can drive the upper mold 1 to rotate and spray the release agent. The reciprocating slide groove 28 includes a vertical section slide groove 281 located at the top and bottom and a reciprocating curved slide groove 282 located between the two vertical section slide grooves 281.

[0071] Specifically, during the downward movement of the upper mold 1, the push plate 27 descends accordingly. When the swing slider 29 on the lower mold 2 enters the reciprocating groove 28 of the push plate 27, it first moves upward along the vertical section of the bottom groove 281 (without rotation). Then, the swing slider 29 enters the reciprocating curved groove 282. Since the output end of the drive source 14 is connected to the upper mold 1 by a bearing rotation, the cooperation between the swing slider 29 and the curved groove 282 forces the push plate 27 and the upper mold 1 to rotate. At this time, the release agent is being sprayed out. The rotation of the upper mold 1 drives the spray channel 12 to rotate and spray, so that the release agent is evenly sprayed on the inclined guide section 22 and flows downward to cover the curved surface of the cavity. Compared with the traditional application method, it is more labor-saving and more uniform.

[0072] Example 4

[0073] The following describes a casting method for manufacturing valve fittings, based on the aforementioned casting apparatus, specifically including the following steps:

[0074] Step 1: Pre-mold closing section and release fluid injection

[0075] The drive mechanism is activated, driving the upper mold 1 to move downwards and approach the lower mold 2. During this process, the side wall of the lower mold 2 first contacts and compresses the bellows pumping element 5. The bellows contracts under pressure, reducing its internal volume. The outlet check valve 52 opens and the inlet check valve 51 closes, allowing the demolding liquid extracted in the previous cycle to be forced into the inlet channel 11 through the outlet pipe and sprayed out through the spray channel 12. The demolding liquid falls directly into the inclined guide section 22 and flows down evenly along the inner wall of the molding cavity of the lower mold 2.

[0076] At the same time, the push plate 27 moves down with the upper mold 1, and the reciprocating slide groove 28 on the side wall of the push plate 27 slides relative to the swing slider 29 on the lower mold 2. When the swing slider 29 enters the reciprocating curved slide groove 282 section, it forces the push plate 27 (and the upper mold 1 connected to it) to generate horizontal reciprocating rotation micro-motion while descending, so that the release liquid sprayed from the spray channel 12 is in a rotating spray state, covering a wider and more uniform area.

[0077] Step 2: Linkage between the middle section of the mold closing mechanism and the side core pulling mechanism.

[0078] As the upper mold 1 continues to move downward, the push plate 27 at the bottom of the upper mold 1 gradually contacts the inclined ejector pin 26 on the lower mold 2. As the push plate 27 presses down, the inclined ejector pin 26 is pressed and drives the side hole core 24 to overcome the tension of the tension spring 25 and slide inward along the inner wall of the lower mold 2, eventually extending into the valve body forming cavity to form the core of the valve side hole.

[0079] Step 3: The final stage of mold closing is linked with the venting and sealing fluid.

[0080] When the upper mold 1 is about to completely close with the lower mold 2 (end of mold closing), the inclined protrusion 21 on the lower mold 2 contacts the end of the exhaust module 3 on the upper mold 1; as the mold closing continues, the inclined protrusion 21 pushes the exhaust module 3 inward (horizontally to the left).

[0081] When the exhaust module 3 slides inward, its internal inclined groove 32 and the slider 45 on the slide rod 43 make sliding contact. Due to the effect of the inclined surface, the horizontal thrust is converted into a vertical upward thrust, which drives the slide rod 43 to move upward along the hollow bracket 42. The sealing plug 44 at the top of the slide rod 43 moves upward and blocks the sealing surface of the conduit 41, thereby closing the liquid inlet channel 11 and the liquid spraying channel 12 to prevent the molten metal from entering the liquid spraying channel during subsequent casting.

[0082] At the same time, the exhaust module 3 moves inward to connect its internal exhaust channel 31 with the mold cavity; at this time the mold is almost closed, the residual gas in the cavity is pressurized, and it converges through the gradually expanding exhaust gap between the closed structure 13 and the inclined guide section 22, and is discharged outside the mold through the exhaust channel 31.

[0083] After the mold is closed, the external gating system injects molten metal into the valve body forming cavity through the sprue cup. At this time, the venting channel 31 continuously vents until the molten metal front edge closes the gap. Since the gap is extremely small and gradually expands, the molten metal will not overflow in large quantities. After the casting is cooled and formed, the drive mechanism drives the upper mold 1 to rise. The upper mold 1 moves upward, the push plate 27 disengages from the inclined ejector rod 26, and the side extraction hole mold core 24 is automatically pulled out and demolded under the tension of the tension spring 25.

[0084] The exhaust module 3 disengages from the push of the inclined protrusion 21 and resets outward under the action of its own spring, causing the inclined slide groove 32 to move in the opposite direction. The slide rod 43 drives the sealing plug 44 to move downward, reopening the connection between the liquid inlet channel 11 and the liquid spraying channel 12. Since the air outlet of the exhaust channel 31 is higher than the air inlet, the release liquid is sprayed directly through the liquid spraying channel 12 after being sprayed out.

[0085] At the same time, the bellows pumping element 5 moves up with the upper mold 1 and is released from the pressure of the lower mold 2. Under the action of the telescopic column spring 54, it resets and expands, generating negative pressure inside. The inlet check valve 51 opens and the outlet check valve 52 closes, drawing out the release liquid from the storage container 53 to prepare for the next liquid spraying. Finally, the molded valve accessories are taken out, completing one work cycle.

[0086] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A casting apparatus for producing valve fittings, characterized in that, include: The upper mold (1), the lower mold (2), the support frame (15), and the drive source (14) are provided. The output end of the drive source (14) is rotatably connected to the upper mold (1) through a bearing. After the upper mold (1) and the lower mold (2) are closed, the interior of the upper mold (1) forms a valve body forming cavity. The upper mold (1) is provided with a liquid inlet channel (11) and a liquid spraying channel (12), which are connected by an opening and closing assembly (4); The exhaust module (3) is horizontally slidably inserted into the interior of the upper mold (1) and abuts against the inclined protrusion (21) fixedly connected to the lower mold (2). The exhaust module (3) is elastically engaged with the upper mold (1) through the return spring (36) so that it can be reset outward after losing the internal thrust. Among them, the side wall of the exhaust module (3) is fixed with an airflow regulating module (34) by adjusting bolts (33). The airflow regulating module (34) has a variable cross-section conical needle plate (35) inserted into the exhaust channel (31). The insertion depth of the variable cross-section conical needle plate (35) in the exhaust channel (31) is changed by adjusting bolts (33), thereby changing the effective flow cross-sectional area of ​​the exhaust channel (31). When the upper mold (1) is in the final stage of the mold closing movement, the opening and closing component (4) is driven by the exhaust module (3) to close the liquid inlet channel (11) and exhaust the gas in the mold through the exhaust channel (31) inside the exhaust module (3); A corrugated pipe liquid extraction element (5) is installed on the upper mold (1). The inlet end of the corrugated pipe liquid extraction element (5) is unidirectionally connected to the liquid storage container (53), and the outlet end of the corrugated pipe liquid extraction element (5) is unidirectionally connected to the liquid inlet channel (11). When the upper mold (1) moves downwards and approaches the front section of the lower mold closing, the corrugated pipe liquid extraction element (5) is compressed by the lower mold (2) and the mold release agent extracted inside is transported to the liquid spraying channel (12).

2. The casting apparatus for valve fitting production according to claim 1, characterized in that, The opening and closing assembly (4) includes a conduit (41) with a sealing surface and a hollow bracket (42) fixed inside the conduit (41). A slide rod (43) is slidably connected inside the hollow bracket (42). A sealing plug (44) is fixedly connected to the top of the slide rod (43), and the bottom of the slide rod (43) is slidably engaged with the exhaust module (3).

3. The casting apparatus for valve fitting production according to claim 2, characterized in that, The insertion end of the exhaust module (3) has a movable groove that is adapted to the slide bar (43). An inclined slide groove (32) is provided on the inner wall of the movable groove. The slide bar (43) is slidably installed in the inclined slide groove (32) by a slider (45).

4. A casting apparatus for valve fitting production according to claim 3, characterized in that, When the exhaust module (3) is pushed inward by the inclined protrusion (21), it drives the slide rod (43) to move upward and closes the liquid spraying channel (12). When the exhaust module (3) is disengaged from the inclined protrusion (21), it resets outward and drives the slide rod (43) to move downward to open the liquid inlet channel (11) and the liquid spraying channel (12).

5. A casting apparatus for valve fitting production according to claim 1, characterized in that, The lower mold (2) has an inwardly extending vertical gathering section (23) and a sloping guide section (22) at the opening of the molding cavity. The upper mold (1) has a closed structure (13) that is compatible with the vertical gathering section (23) and the sloping guide section (22). The release agent sprayed by the spray channel (12) falls directly into the sloping guide section (22) and flows downward along the molding cavity of the lower mold (1).

6. A casting apparatus for valve fitting production according to claim 5, characterized in that, The exhaust gap formed between the closed structure (13) and the inclined guide section (22) gradually expands along the exhaust direction, and the exhaust channel (31) is configured to allow gas to be discharged from the barrier molding material.

7. A casting apparatus for valve fitting production according to claim 1, characterized in that, The inlet pipe of the corrugated pipe pumping element (5) is equipped with an inlet check valve (51), and the outlet pipe of the corrugated pipe pumping element (5) is equipped with an outlet check valve (52). The inner top wall and the inner bottom wall of the corrugated pipe pumping element (5) are fixedly connected by a telescopic column spring (54).

8. A casting apparatus for valve fitting production according to claim 1, characterized in that, The inner wall of the lower mold (2) is also slidably fitted with a side-drawing core (24). The fixed end of the side-drawing core (24) is elastically engaged with the lower mold through a tension spring (25). The fixed end of the side-drawing core (24) is connected to a sloping push rod (26). The bottom of the upper mold (1) is fixedly connected to a push plate (27). After the push plate (27) abuts against the sloping push rod (26), it pushes the side-drawing core (24) into the valve body forming cavity.

9. A casting apparatus for valve fitting production according to claim 8, characterized in that, The push plate (27) has a reciprocating groove (28) on its side wall, and the lower mold (2) has a swing slider (29) fixedly connected to its inner side wall. When the push plate (27) moves relative to the swing slider (29), it can drive the upper mold (1) to rotate and spray the release agent.

10. A casting apparatus for producing valve fittings according to claim 9, characterized in that, The reciprocating chute (28) includes a vertical section chute (281) located at the top and bottom and a reciprocating curved chute (282) located between the two vertical section chute (281).

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