Numerical control sand shooting and exhausting combined valve and core making equipment

Abstract

The application provides a numerical control sand shooting and exhaust combination valve and a core making equipment, and relates to the technical field of core making. The numerical control sand shooting and exhaust combination valve comprises a valve body, a sand shooting controllable power part and an exhaust servo power part; a sand shooting valve seat and an exhaust valve seat are arranged in the valve body, and the space in the valve body is divided into an air inlet cavity, a sand shooting cavity and an exhaust cavity by the sand shooting valve seat and the exhaust valve seat; a sand shooting valve core is arranged on the sand shooting valve seat, and an exhaust valve core is arranged on the exhaust valve seat; an air inlet, an exhaust outlet connected with an exhaust pipe and a connecting outlet connected with a sand shooting cylinder are arranged on the valve body; the air inlet is communicated with the air inlet cavity, the exhaust outlet is communicated with the exhaust cavity, and the connecting outlet is communicated with the sand shooting cavity; the sand shooting controllable power part is arranged on the outer wall of the air inlet cavity, and the sand shooting controllable power part is connected with the sand shooting valve core; the exhaust servo power part is arranged on the outer wall of the exhaust cavity, and the exhaust servo power part is connected with the exhaust valve core. The core making equipment comprises the numerical control sand shooting and exhaust combination valve. The technical effect of improving the sand shooting effect is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of core making, in particular to a numerically controlled sand-shooting exhaust combination valve and core making equipment. Background Art

[0002] Core shooters are typically equipped with two valves: a sand shooting (intake) valve and an exhaust valve. Sand shooting involves using compressed air to draw molding sand from a sand shooting chamber into the core box for forming. After the core shooter has finished sand shooting, exhaust must be performed to prevent high pressure within the sand core, which can affect core quality, and to prevent sand leakage and dust ejection from the nozzle caused by high pressure in the sand shooting tube. The sand shooting valve currently uses an angle seat valve, while the exhaust valve uses a diaphragm valve. The sand shooting valve is installed on the sand shooting line, while the exhaust valve is installed on the exhaust line. They are controlled by a PLC program to open and close according to the needs of the core making process.

[0003] However, the opening response time and pressure increase speed dP / dt of the traditional sand shooting valve cannot be adjusted according to the needs of the core making process. As a result, the density of the sand cores is uneven. The sand shooting time and pressure parameters remain unchanged, but the problem of partial false shooting of the sand cores still occurs from time to time. In terms of sand shooting process control, the only way to match various sand cores is to adjust the sand shooting pressure and sand shooting time. Based on actual use and test results, the adjustment of the sand shooting time has basically no effect on the sand shooting effect, and extending the sand shooting time cannot optimize the sand shooting effect.

[0004] Therefore, providing a numerically controlled sand-shooting exhaust combination valve and a core-making device that improve the sand-shooting effect has become an important technical problem to be solved by those skilled in the art. Summary of the Invention

[0005] The object of the present invention is to provide a numerically controlled sand-shooting exhaust combination valve and a core-making device, so as to alleviate the technical problem that the sand-shooting valve in the prior art cannot optimize the sand-shooting effect.

[0006] In a first aspect, an embodiment of the present invention provides a numerically controlled sand-shooting and exhaust combination valve, comprising a valve body, a sand-shooting controllable power component, and an exhaust servo power component;

[0007] A sand-shooting valve seat and an exhaust valve seat are provided in the valve body, and the space in the valve body is divided into an air intake chamber, a sand-shooting chamber and an exhaust chamber by the sand-shooting valve seat and the exhaust valve seat. A sand-shooting valve core is provided on the sand-shooting valve seat, and an exhaust valve core is provided on the exhaust valve seat.

[0008] The valve body is provided with an air inlet that can be connected to the air bag, an exhaust port connected to the exhaust pipe, and a connecting port connected to the sand shooting tube, the air inlet is communicated with the air inlet cavity, the exhaust port is communicated with the exhaust cavity, and the connecting port is communicated with the sand shooting cavity;

[0009] The controllable sand-shooting power component is arranged on the outer wall of the air inlet cavity, and the controllable sand-shooting power component is connected to the sand-shooting valve core;

[0010] The exhaust servo power component is arranged on the outer wall of the exhaust chamber, and the exhaust servo power component is connected to the exhaust valve core.

[0011] In combination with the first aspect, an embodiment of the present invention provides a possible implementation method of the first aspect, wherein the above-mentioned CNC sand shooting exhaust combination valve also includes a balancing cylinder, the balancing cylinder is arranged on the outer wall of the air inlet chamber, the valve stem of the sand shooting valve core is connected to the piston of the balancing cylinder, and the movable end of the sand shooting controllable power part is connected to the piston of the balancing cylinder.

[0012] In combination with the first aspect, an embodiment of the present invention provides a possible implementation of the first aspect, wherein the above-mentioned sand-shooting controllable power component includes a proportional electromagnet, an armature and a return spring;

[0013] The proportional electromagnet is arranged on the balancing cylinder, the armature is connected to the piston of the balancing cylinder, and the armature is located between the proportional electromagnets, so that the proportional electromagnet is energized to drive the armature to drive the sand shooting valve seat to move;

[0014] The return spring is sleeved on the valve stem of the sand-shooting valve core, one end of the return spring abuts against the sand-shooting valve core, and the other end abuts against the inner wall of the valve body.

[0015] In combination with the first aspect, an embodiment of the present invention provides a possible implementation of the first aspect, wherein a hydraulic buffer is provided on the proportional electromagnet, and the armature can abut against the hydraulic buffer.

[0016] In combination with the first aspect, an embodiment of the present invention provides a possible implementation method of the first aspect, wherein the above-mentioned sand-shooting controllable power part adopts a sand-shooting servo electric cylinder, and the sand-shooting servo electric cylinder is arranged on the balancing cylinder. The movable end of the sand-shooting servo electric cylinder is connected to the piston of the balancing cylinder, so that the sand-shooting servo electric cylinder drives the balancing cylinder to drive the sand-shooting valve core to move.

[0017] In combination with the first aspect, an embodiment of the present invention provides a possible implementation of the first aspect, wherein the exhaust servo power component adopts an exhaust servo electric cylinder.

[0018] In combination with the first aspect, an embodiment of the present invention provides a possible implementation of the first aspect, wherein a noise reduction baffle is provided in the exhaust chamber, and the noise reduction baffle separates the exhaust port from the exhaust valve seat;

[0019] The noise reduction baffle is provided with a through hole for the valve stem of the exhaust valve core to pass through and a plurality of silencer holes for reducing noise.

[0020] In combination with the first aspect, an embodiment of the present invention provides a possible implementation of the first aspect, wherein the above-mentioned multiple silencer holes are arranged in a row on the noise reduction flow baffle, and the apertures of the silencer holes gradually decrease from top to bottom.

[0021] In combination with the first aspect, an embodiment of the present invention provides a possible implementation of the first aspect, wherein the noise reduction flow baffle is a curved plate, and the convex surface of the curved plate faces the exhaust valve seat.

[0022] In a second aspect, an embodiment of the present invention provides a core-making device, comprising the numerically controlled sand-shooting exhaust combination valve.

[0023] Beneficial effects:

[0024] An embodiment of the present invention provides a numerically controlled sand-shooting and exhaust combination valve, comprising a valve body, a sand-shooting controllable power part and an exhaust servo power part; a sand-shooting valve seat and an exhaust valve seat are provided in the valve body, and the space in the valve body is divided into an air intake chamber, a sand-shooting chamber and an exhaust chamber by the sand-shooting valve seat and the exhaust valve seat, a sand-shooting valve core is provided on the sand-shooting valve seat, and an exhaust valve core is provided on the exhaust valve seat; the valve body is provided with an air inlet that can be connected to an air bag, an exhaust port connected to an exhaust pipe and a connecting port connected to a sand-shooting tube, the air inlet is connected to the air intake chamber, the exhaust port is connected to the exhaust chamber, and the connecting port is connected to the sand-shooting chamber; the sand-shooting controllable power part is provided on the outer wall of the air intake chamber, and the sand-shooting controllable power part is connected to the sand-shooting valve core; the exhaust servo power part is provided on the outer wall of the exhaust chamber, and the exhaust servo power part is connected to the exhaust valve core.

[0025] Specifically, the sand-shooting valve core and exhaust valve core are both mounted on the valve body, allowing the valve ports for both sand-shooting and exhaust to be positioned closest to the sand-shooting barrel. This not only achieves better sand-shooting and exhaust effects, but also saves piping and space. Furthermore, the sand-shooting valve core is controlled by a controllable sand-shooting power element, enabling digital control of the sand-shooting process. This reliably and stably improves the quality of sand-shooting core production and enhances the efficiency of the core-shooting machine.

[0026] The present invention provides a core making device comprising a numerically controlled sand-shooting exhaust combination valve. The core making device has the above-mentioned advantages over the prior art, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 A schematic structural diagram of a first embodiment of a numerically controlled sand-blasting exhaust combination valve provided in an embodiment of the present invention;

[0029] Figure 2 for Figure 1 Schematic diagram of the exhaust valve in direction A;

[0030] Figure 3 This is a structural schematic diagram of a second embodiment of the CNC sand-blasting exhaust combination valve provided in an embodiment of the present invention.

[0031] icon:

[0032] 100-valve body; 101-air inlet chamber; 102-sand shooting chamber; 103-exhaust chamber; 104-air inlet; 105-exhaust port; 106-connection port; 110-sand shooting valve seat; 111-sand shooting valve core; 120-exhaust valve seat; 121-exhaust valve core; 130-noise reduction baffle;

[0033] 200-sand-shooting controllable power unit; 211-proportional electromagnet; 212-armature; 213-reset spring; 214-hydraulic buffer; 220-sand-shooting servo cylinder;

[0034] 300-exhaust servo power parts;

[0035] 400-Balanced cylinder. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0039] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0040] The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0041] See also Figure 1 、 Figure 2 and Figure 3As shown, the embodiment of the present invention provides a numerically controlled sand-shooting and exhaust combination valve, comprising a valve body 100, a sand-shooting controllable power part 200 and an exhaust servo power part 300; a sand-shooting valve seat 110 and an exhaust valve seat 120 are provided in the valve body 100, and the space in the valve body 100 is divided into an air inlet chamber 101, a sand-shooting chamber 102 and an exhaust chamber 103 by the sand-shooting valve seat 110 and the exhaust valve seat 120; a sand-shooting valve core 111 is provided on the sand-shooting valve seat 110, and an exhaust valve core 121 is provided on the exhaust valve seat 120; a valve body 100 is provided with a valve core 111 which can be connected with the valve body 100; a valve core 111 is provided on ... The air inlet 104 connected to the air bag, the exhaust port 105 connected to the exhaust pipe and the connecting port 106 connected to the sand shooting tube, the air inlet 104 is connected to the air inlet chamber 101, the exhaust port 105 is connected to the exhaust chamber 103, and the connecting port 106 is connected to the sand shooting chamber 102; the sand shooting controllable power component 200 is arranged on the outer wall of the air inlet chamber 101, and the sand shooting controllable power component 200 is connected to the sand shooting valve core 111; the exhaust servo power component 300 is arranged on the outer wall of the exhaust chamber 103, and the exhaust servo power component 300 is connected to the exhaust valve core 121.

[0042] Specifically, the sand-shooting valve core 111 and the exhaust valve core 121 are both located on the valve body 100, allowing the valve ports for both sand-shooting and exhaust to be positioned closest to the sand-shooting barrel. This not only achieves better sand-shooting and exhaust effects, but also saves piping and space. Furthermore, the sand-shooting controllable power element 200 controls the sand-shooting valve core 111, enabling digital control of the sand-shooting process. This reliably and stably improves the quality of sand-shooting core production and enhances the efficiency of the core-shooting machine.

[0043] In addition, through the setting of the exhaust servo power component 300, the exhaust valve core 121 can be slowly driven by the exhaust servo power component 300 to slowly open the exhaust valve seat 120, and the high-pressure gas can be discharged in a small flow rate manner without generating noise; after the pressure drops to a certain value, the exhaust servo power component 300 drives the exhaust valve core 121 to quickly move away from the exhaust valve seat 120, adjusts to a large exhaust volume, and discharges a large flow of gas. Since there is no high pressure, no noise will be generated, and the sand in the sand shooting tube will not be brought to the exhaust net, and finally the exhaust time is minimized without making much noise.

[0044] It should be pointed out that the valve body 100 has three chambers, namely the air inlet chamber 101, the sand shooting chamber 102 and the exhaust chamber 103. The structure adopts a straight-through pipe structure, which is not only compact, but also makes the air flow changes of sand shooting or exhaust smooth and undisturbed, avoiding pressure loss and loud noise and vibration damage of the valve body 100 caused by air flow turbulence.

[0045] See also Figure 1 、 Figure 2 and Figure 3As shown, in the optional scheme of this embodiment, the CNC sand-shooting exhaust combination valve also includes a balancing cylinder 400, which is arranged on the outer wall of the air inlet chamber 101, the valve stem of the sand-shooting valve core 111 is connected to the piston of the balancing cylinder 400, and the movable end of the sand-shooting controllable power part 200 is connected to the piston of the balancing cylinder 400.

[0046] Specifically, the operation of the controllable sand-shooting power element 200 can drive the piston of the balancing cylinder 400 to move, thereby driving the movement of the sand-shooting valve core 111 connected to the piston. Furthermore, the provision of the balancing cylinder 400 can reduce the output power of the controllable sand-shooting power element 200 to ensure digital and reliable actuation of the valve stem of the sand-shooting valve core 111 to open and close the valve.

[0047] See also Figure 1 As shown, in the optional scheme of this embodiment, the sand-shooting controllable power part 200 includes a proportional electromagnet 211, an armature 212 and a return spring 213; the proportional electromagnet 211 is arranged on the balancing cylinder 400, the armature 212 is connected to the piston of the balancing cylinder 400, and the armature 212 is located between the proportional electromagnets 211, so that the proportional electromagnet 211 is energized to drive the armature 212 to drive the sand-shooting valve seat 110 to move; the return spring 213 is sleeved on the valve stem of the sand-shooting valve core 111, one end of the return spring 213 abuts against the sand-shooting valve core 111, and the other end abuts against the inner wall of the valve body 100.

[0048] Specifically, the balancing cylinder 400 is disposed on the outer wall of the air inlet chamber 101. The front portion of the piston of the balancing cylinder 400 is connected to the air storage chamber. The proportional electromagnet 211 is disposed on the balancing cylinder 400. The armature 212 disposed between the proportional electromagnets 211 is connected to the top of the piston of the balancing cylinder 400. The bottom of the piston of the balancing cylinder 400 is connected to the valve stem of the sand-shooting valve core 111. A return spring 213 is sleeved on the valve stem of the sand-shooting valve core 111. During sand-shooting air intake, the proportional electromagnet 211 is energized, the armature 212 drives the piston of the balancing cylinder 400 to move, and the piston of the balancing cylinder 400 drives the valve stem to rapidly lift the sand-shooting valve core 111 upward, allowing compressed air to rapidly enter the sand-shooting chamber 102 from the air inlet chamber 101, and then enter the sand-shooting barrel, shooting the core sand in the sand-shooting barrel into the core box at the bottom of the sand-shooting barrel to form a core. After the air intake is completed, the proportional solenoid 211 is de-energized, and the sand-shooting valve core 111 is reset and pressed against the sand-shooting valve seat 110 under the action of the reset spring 213 .

[0049] In addition, the controllable sand-shooting power part 200 uses a proportional electromagnet 211 as the power for opening and moving the sand-shooting valve core 111. It has a fast response, an opening time of milliseconds (ms), and can adjust the opening speed steplessly. For different sand core products, the optimal sand-shooting boost speed dP / dt curve is implemented to truly realize digital control, ultimately meeting the core-making process requirements of different sand cores and producing high-quality sand cores with uniform density.

[0050] See also Figure 1 As shown, in an optional solution of this embodiment, a hydraulic buffer 214 is provided on the proportional electromagnet 211 , and the armature 212 can abut against the hydraulic buffer 214 .

[0051] Specifically, a hydraulic buffer 214 is provided on the proportional electromagnet 211 . The hydraulic buffer 214 is provided to reduce the impact on the valve body 100 when the sand-shooting valve core 111 is opened quickly.

[0052] See also Figure 3 As shown, in the optional scheme of this embodiment, the sand-shooting controllable power part 200 adopts a sand-shooting servo electric cylinder 220, which is arranged on the balancing cylinder 400, and the movable end of the sand-shooting servo electric cylinder 220 is connected to the piston of the balancing cylinder 400, so that the sand-shooting servo electric cylinder 220 drives the balancing cylinder 400 to drive the sand-shooting valve core 111 to move.

[0053] Specifically, the controllable sand-shooting power element 200 can also employ a sand-shooting servo electric cylinder 220. The sand-shooting servo electric cylinder 220 is mounted on the balancing cylinder 400, and the movable end of the sand-shooting servo electric cylinder 220 is connected to the piston of the balancing cylinder 400. Thus, when the sand-shooting servo electric cylinder 220 is in operation, it can drive the piston of the balancing cylinder 400 to move, thereby driving the movement of the sand-shooting valve core 111. During air intake, the sand-shooting servo electric cylinder 220 can drive the sand-shooting valve core 111 away from the sand-shooting valve seat 110. After air intake is complete, the sand-shooting servo electric cylinder 220 can drive the sand-shooting valve core 111 to press against the sand-shooting valve seat 110.

[0054] In an optional solution of this embodiment, the exhaust servo power component 300 adopts an exhaust servo electric cylinder.

[0055] Specifically, the exhaust servo power component 300 adopts an exhaust servo electric cylinder, and may also adopt an exhaust servo hydraulic cylinder.

[0056] In addition, the exhaust valve uses an exhaust servo electric cylinder as the power to open and move the exhaust valve core 121. The opening speed is faster than that of the diaphragm valve, and the fastest speed can reach 2m / s. The opening and closing speed of the exhaust valve can be digitally controlled, thereby forming the optimal exhaust process curve on demand, shortening the exhaust time, reducing the single cycle beat of the core shooting machine, and improving the core making efficiency by 5-10%, which is equivalent to improving the utilization rate of the core shooting machine and reducing fixed investment.

[0057] See also Figure 2 As shown, in an optional solution of this embodiment, a noise-reducing baffle 130 is installed in the exhaust chamber 103, separating the exhaust port 105 from the exhaust valve seat 120. The baffle 130 includes a through hole for the valve stem of the exhaust valve core 121 to pass through, and multiple silencer holes for reducing noise. The multiple silencer holes are arranged in a row on the baffle 130, and the apertures of the silencer holes gradually decrease from top to bottom.

[0058] Specifically, the noise reduction baffle 130 can reduce noise, and multiple silencer holes are arranged in a row on the noise reduction baffle 130, and the aperture of the silencer holes gradually decreases from top to bottom, which can further reduce the generation of noise and the impact and vibration of the airflow on the valve body 100.

[0059] See also Figure 2 As shown, in an optional solution of this embodiment, the noise reduction flow baffle 130 is an arc-shaped plate, and the convex surface of the arc-shaped plate faces the exhaust valve seat 120.

[0060] Specifically, the noise reduction baffle 130 is an arc-shaped plate, and the convex surface of the arc-shaped plate faces the exhaust valve seat 120. Through this arrangement, the structural strength of the noise reduction baffle 130 is improved, and during the exhaust process, the gas will not break the noise reduction baffle 130.

[0061] This embodiment provides a core making device, including a numerically controlled sand-shooting exhaust combination valve.

[0062] Specifically, the core making equipment provided in this embodiment has the advantages of the above-mentioned numerically controlled sand-shooting exhaust combination valve compared with the prior art, which will not be described in detail here.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A numerically controlled sandblasting exhaust combination valve, characterized in that: include: A valve body (100), a sand-shooting controllable power component (200), and an exhaust servo power component (300); A sand-shooting valve seat (110) and an exhaust valve seat (120) are provided in the valve body (100), and the space in the valve body (100) is divided into an air inlet chamber (101), a sand-shooting chamber (102) and an exhaust chamber (103) by the sand-shooting valve seat (110) and the exhaust valve seat (120); a sand-shooting valve core (111) is provided on the sand-shooting valve seat (110), and an exhaust valve core (121) is provided on the exhaust valve seat (120); The valve body (100) is provided with an air inlet (104) that can be connected to an air bag, an exhaust port (105) that is connected to an exhaust pipe, and a connection port (106) that is connected to a sand-shooting tube. The air inlet (104) is in communication with the air inlet cavity (101), the exhaust port (105) is in communication with the exhaust cavity (103), and the connection port (106) is in communication with the sand-shooting cavity (102). The controllable sand-shooting power component (200) is arranged on the outer wall of the air inlet cavity (101), and the controllable sand-shooting power component (200) is connected to the sand-shooting valve core (111); The exhaust servo power component (300) is arranged on the outer wall of the exhaust chamber (103), and the exhaust servo power component (300) is connected to the exhaust valve core (121).

2. The CNC sandblasting exhaust combination valve according to claim 1, characterized in that: It also includes a balancing cylinder (400), which is arranged on the outer wall of the air inlet chamber (101), the valve stem of the sand-shooting valve core (111) is connected to the piston of the balancing cylinder (400), and the movable end of the sand-shooting controllable power part (200) is connected to the piston of the balancing cylinder (400).

3. The CNC sandblasting exhaust combination valve according to claim 2, characterized in that: The sand-shooting controllable power component (200) comprises a proportional electromagnet (211), an armature (212) and a return spring (213); The proportional electromagnet (211) is arranged on the balancing cylinder (400), the armature (212) is connected to the piston of the balancing cylinder (400), and the armature (212) is located between the proportional electromagnets (211), so that the proportional electromagnet (211) is energized to drive the armature (212) to drive the sand shooting valve seat (110) to move; The return spring (213) is sleeved on the valve stem of the sand-shooting valve core (111), one end of the return spring (213) abuts against the sand-shooting valve core (111), and the other end abuts against the inner wall of the valve body (100).

4. The CNC sandblasting exhaust combination valve according to claim 3, characterized in that: A hydraulic buffer (214) is provided on the proportional electromagnet (211), and the armature (212) can abut against the hydraulic buffer (214).

5. The CNC sandblasting exhaust combination valve according to claim 2, characterized in that: The sand-shooting controllable power part (200) adopts a sand-shooting servo electric cylinder (220), which is arranged on the balancing cylinder (400). The movable end of the sand-shooting servo electric cylinder (220) is connected to the piston of the balancing cylinder (400), so that the sand-shooting servo electric cylinder (220) drives the balancing cylinder (400) to drive the sand-shooting valve core (111) to move.

6. The numerically controlled sandblasting exhaust combination valve according to any one of claims 1 to 5, characterized in that: The exhaust servo power component (300) adopts an exhaust servo electric cylinder.

7. The numerically controlled sandblasting exhaust combination valve according to claim 6, characterized in that: A noise reduction flow baffle (130) is provided in the exhaust cavity (103), and the noise reduction flow baffle (130) separates the exhaust port (105) from the exhaust valve seat (120); The noise reduction baffle (130) is provided with a through hole for the valve stem of the exhaust valve core (121) to pass through and a plurality of silencer holes for reducing noise.

8. The numerically controlled sandblasting exhaust combination valve according to claim 7, characterized in that: A plurality of the muffler holes are arranged in a row on the noise reduction flow baffle (130), and the apertures of the muffler holes gradually decrease from top to bottom.

9. The numerically controlled sandblasting exhaust combination valve according to claim 7, characterized in that: The noise reduction flow baffle (130) is a curved plate, with the convex surface of the curved plate facing the exhaust valve seat (120).

10. A core making device, characterized in that: It comprises the numerically controlled sand-blasting exhaust combination valve according to any one of claims 1 to 9.

Images