Shell core machine with composite function

Abstract

The shell core machine with the composite function comprises a supporting frame, a sand blasting device is arranged on the upper portion of the supporting frame, and the sand blasting device is used for downwards blasting sand grains and a binding agent; a horizontal module support and a vertical module support are arranged on the lower portion of the supporting frame, the horizontal module support comprises a left mold supporting part and a right mold supporting part which are arranged in a left-right corresponding mode, and the left mold supporting part and the right mold supporting part are in sliding and rotating connection with the left end and the right end of the corresponding supporting frame correspondingly. The vertical module support comprises an upper mold supporting part and a lower mold supporting part which are correspondingly arranged up and down, the upper mold supporting part is fixedly connected with the supporting frame, and the lower mold supporting part is connected with the supporting frame in an up-down sliding mode. And the mold can be overturned for sand pouring, so that the shell core machine can be used for manufacturing shell cores with different thicknesses.

Description

Technical Field

[0001] The present invention relates to the technical field of molding sand molding, and particularly to a shell core machine with composite functions. Background Art

[0002] A shell core machine is a device for manufacturing coated sand shell cores using the hot core box process. The shell core machine adopts the hot core box process and opens and closes the mold for parting. The overall structure of the shell core machine mainly consists of a support frame, a sand blasting device, a mold support part, and other components. The entire mold support part is installed on the base by the support frame. The moving template moves left and right under the push and pull during mold closing to complete the core-making process of mold closing and mold opening. When the moving template opens the mold, under the action of the spring top force on the fixed template, the sand core automatically follows on the moving template and can be easily taken out by hand.

[0003] Due to the different thicknesses of the shell cores, when the shell core machine produces shell cores with a thicker outer shell, the coated sand distributed in the inner cavity of the shell core has not completely solidified during the heating process, and the foundry process can be used to pour it out for improving the recycling rate of the coated sand. When the horizontal clamping type shell core machine manufactures shell cores with a thicker outer shell, the shell core machine adopts a flipping device to enable the left and right distributed molds to automatically flip within a range of 180 degrees. After pouring out the excess un-cured coated sand inside, a qualified shell core is formed.

[0004] When the vertical clamping type shell core machine manufactures shell cores with a thinner outer shell, there is no need to use the foundry process, and the mold is moved inward to complete mold closing to form a qualified shell core.

[0005] However, since the production of shell cores with different thicknesses requires corresponding different models, this results in low equipment utilization rate and does not meet the requirements of lean production; when switching equipment, different supporting equipment usually needs to be switched at the same time, such as a sand blasting device, which further reduces the production efficiency and increases the production cost.

[0006] A core shell machine known to the applicant (CN 104668476 A) includes a base. A frame is provided on the base. A sand adding hopper is provided at the upper end of the frame. A sand shooting mechanism is provided on the frame corresponding to the sand adding hopper. A sand shooting cylinder corresponding to the sand shooting mechanism is provided at the top of the frame. The sand shooting mechanism includes a sand shooting head and a sand cylinder. Hanging feet are respectively provided on both sides of the upper end of the sand cylinder. The top of the hanging feet is connected to a pulley through a rotating shaft. A linear guide rail matched with the pulley is provided on the frame. The sand cylinder is hung on the linear guide rail through the hanging feet. A driving cylinder is provided on the frame. The piston rod of the driving cylinder is connected to the sand cylinder. Support seats are respectively provided on both sides of the base. Two support roller wheels are provided on the support seats. A template support is arranged on the support roller wheels of the two support seats on both sides. The template support includes a linear guide rod. A movable template is slidably connected to the linear guide rod through a guide sleeve. A fixed template matched with the movable template is provided at one end of the linear guide rod. The movable template is connected to a mold closing cylinder. A rotating shaft is fixedly provided on one side of the template support. The rotating shaft is connected to a driving device.

[0007] The above application has the following problems: By setting a linear guide rod and a movable template arranged on the linear guide rod, the above equipment can only complete the mold closing process in the core shell production process and cannot perform the sand turning operation. When producing core shells with a relatively thick wall thickness, the above equipment cannot recycle the coated sand, increasing the cost of core shell production and having certain production limitations. Summary of the Invention

[0008] The purpose of the present invention is to provide a core shell machine with composite functions, which can complete left-right mold closing or up-down mold closing, and after the core shell machine completes left-right mold closing, it can realize sand pouring through mold flipping, enabling a set of core shell machine equipment to manufacture core shells with two different processes.

[0009] The present invention adopts the following technical solutions: A core shell machine with composite functions includes a support frame. A sand blasting device is provided in the upper part of the support frame. The sand blasting device is used for spraying sand grains and binder downward. A horizontal module support and a vertical module support are provided in the lower part of the support frame. The horizontal module support includes a left mold support part and a right mold support part arranged corresponding to each other left and right. The left mold support part and the right mold support part are respectively horizontally slidably and rotatably connected to the left and right ends of the corresponding support frame. The vertical module support includes an upper mold support part and a lower mold support part arranged corresponding to each other up and down. The upper mold support part is fixedly connected to the support frame, and the lower mold support part is slidably connected to the support frame up and down.

[0010] Further, the sand blasting device includes a sand cylinder vertically arranged with openings at both ends. A sand blasting part is provided below the sand cylinder. The sand blasting part is used for guiding the sand grains and binder in the sand cylinder into the first core shell cavity and the second core shell cavity.

[0011] Further, a sealing portion is provided at the upper opening of the sand cylinder. The sealing portion includes a sealing cylinder which is vertically arranged, and the fixed end of the sealing cylinder is fixed at the top of the support frame. A sealing sleeve is fixed to the movable end of the sealing cylinder. An air vent pipe is further opened on one side of the sealing sleeve. The air vent pipe is communicated with an air pump and is arranged corresponding to the upper opening of the sand cylinder at the lower end face of the sealing sleeve.

[0012] Further, the sand blasting portion includes a sand shooting funnel with openings at both the upper and lower ends. A sand shooting plate is provided at the lower opening of the sand shooting funnel. A plurality of threaded through holes are provided on the sand shooting plate, and the threaded through holes are arranged in a matrix. Sand shooting nozzles are connected to the threaded through holes by threads, and sand shooting through holes are coaxially opened in the sand shooting nozzles. A first sand blocking plate is further arranged in parallel above the sand shooting through holes. Four corners of the first sand blocking plate are fixedly connected to the first sand blocking plate through columns, and a first sand shooting channel is formed by a set distance between the first sand blocking plate and the sand shooting plate. A second sand shooting channel is formed by the gap between the circumferential direction of the first sand blocking plate and the inner cavity of the sand shooting funnel. In order to ensure that only the sand shooting through holes corresponding to the first injection hole or the second injection hole are in a conducting state among the plurality of sand shooting through holes arranged in a matrix, a plug is coaxially and detachably connected to each group of sand shooting through holes. In this embodiment, the detachable connection can be realized by an insertion method.

[0013] Further, the sand blasting portion includes a sand shooting funnel with openings at both the upper and lower ends. The lower part of the inner cavity section of the sand shooting funnel is in a flared shape. A sand shooting plate is provided at the lower opening of the flared shape. A second sand blocking plate is arranged above the sand shooting plate. The circumferential direction of the second sand blocking plate fits with the flared shape of the lower part of the inner cavity section of the sand shooting funnel, and the second sand blocking plate is slidably connected to the sand shooting plate up and down through a guide rod. A compression spring is coaxially sleeved on the guide rod between the second sand blocking plate and the sand shooting plate, and the compression spring is always in a compressed state. A plurality of guide holes are opened on the sand shooting plate, and the guide holes are arranged in a matrix and each group of guide holes penetrates through the sand shooting plate up and down. A set of self-opening and closing sand shooting mechanisms are coaxially inserted into each group of guide holes. The upper part of the self-opening and closing sand shooting mechanism is fixed to the second sand blocking plate and the lower part is arranged corresponding to the lower opening of the guide hole. Each group of self-opening and closing sand shooting mechanisms is slidably connected to the corresponding guide hole up and down.

[0014] Further, a negative pressure switch is further arranged in the inner cavity of the self-opening and closing sand shooting mechanism, and the negative pressure switch is used to control the position change between the lower part of the self-opening and closing sand shooting mechanism and the lower opening of the corresponding guide hole.

[0015] Further, the self-opening and closing sand shooting mechanism includes a connecting cylinder with upper and lower ends being conductive; a variable pitch connecting part is inserted into the upper end of the connecting cylinder, and the lower end passes through a corresponding guide hole; an elastic plug is coaxially fixed at the lower end of the connecting cylinder. The upper part of the elastic plug is a frustum of a cone, and the frustum of the cone is arranged corresponding to the lower opening of the guide hole. The lower part of the elastic plug is a cylindrical structure arranged coaxially, and the cylindrical structure is made of an elastic material; a first through hole is opened at the axis of the elastic plug and is communicated with the inner cavity of the connecting cylinder. A second through hole is radially opened at the frustum of the cone of the upper part of the elastic plug, and the second through hole is communicated with the inner cavity of the first through hole; a negative pressure switch is arranged in the inner cavity of the variable pitch connecting part.

[0016] Further, the variable pitch connecting part includes a control sleeve and a control piston. The upper end surface of each control sleeve is fixedly connected to the lower end surface of the second sand baffle; the control sleeve is in a cylindrical shape with an open lower end, and a hollow control piston is inserted into the opening; a driving spring is coaxially arranged on the connecting cylinder at the lower end of the control piston. The upper end of the driving spring is fixed to the lower end surface of the control piston, and the lower end of the driving spring is fixed to the upper end surface of the sand shooting plate, and the driving spring is always in a compressed state.

[0017] Further, the negative pressure switch includes a peristaltic piston. The lower part of the peristaltic piston is inserted into the upper opening of the first through hole of the connecting cylinder and is slidably connected to the connecting cylinder up and down. The inner ends of two groups of horizontal tie rods are circumferentially and evenly hinged to the upper part of the peristaltic piston; the outer end of each tie rod is hinged to a horizontally arranged limit post; the outer end of the limit post is spherical, and the limit post passes through the side wall of the control piston in the radial direction and is slidably connected to the side wall of the control piston. The spherical surface at the outer end of the limit post abuts against the lower end of the control sleeve.

[0018] Further, a return spring is arranged above the peristaltic piston. The upper and lower ends of the return spring are respectively fixed to the inner top wall of the control piston and the upper end surface of the peristaltic piston; when the return spring is in a natural state, the two groups of horizontal tie rods are in a horizontal position.

[0019] By providing a horizontal module bracket and a vertical module bracket, the shell core machine can produce shell cores with different process requirements, improving the utilization rate of the equipment.

[0020] By providing a self-opening and closing sand shooting mechanism, it is avoided that manual verification makes the first injection hole or the second injection hole coaxially arranged with the sand shooting guide hole.

[0021] By providing a variable pitch connecting part, the relative position of the elastic plug and the corresponding sand shooting guide hole is controlled, thereby controlling the conduction or sealing of the guide hole.

[0022] By providing a negative pressure switch, the elastic plug can automatically judge and adapt to the position of the first injection hole or the second injection hole, and can automatically conduct the corresponding guide hole and automatically close the other guide holes, avoiding manual adjustment and improving the production efficiency and the qualified product rate. Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of the support frame in the present invention; Figure 2 It is a schematic structural diagram of the second upper die in the present invention; Figure 3 It is a schematic structural diagram of the sandblasting device in the present invention; Figure 4 It is a schematic structural diagram of the driving gear in the present invention; Figure 5 It is a schematic structural diagram of the support shaft in the present invention; Figure 6 It is a schematic structural diagram of the driving gear in the present invention; Figure 7 It is a schematic structural diagram of the sand cylinder in the present invention; Figure 8 It is a schematic structural diagram of the moving frame in the present invention; Figure 9 It is a schematic structural diagram of the sand bin in the present invention; Figure 10 It is a schematic structural diagram of the sealing sleeve in the present invention; Figure 11 It is a schematic structural diagram of the sand shooting funnel in the present invention; Figure 12 It is a schematic structural diagram of the sand shooting plate in the present invention; Figure 13 It is a schematic structural diagram of the plug in the present invention; Figure 14 It is a schematic structural diagram of the first sand shooting channel in the present invention; Figure 15 It is a schematic structural diagram of the second sand retaining plate in the present invention; Figure 16 It is a schematic structural diagram of the guide hole in the present invention; Figure 17 It is a schematic structural diagram of the first through hole in the present invention.

[0024] In the figure, 1 is the support frame; 2 is the sandblasting device; 3 is the left mold support part; 4 is the right mold support part; 5 is the upper mold support part; 6 is the lower mold support part; 7 is the first upper mold; 8 is the first lower mold; 9 is the first shell core cavity; 10 is the first injection hole; 11 is the second upper mold; 12 is the moving plate; 13 is the rotating plate; 14 is the moving rod; 15 is the driving cylinder; 16 is the support shaft; 17 is the motor bracket; 18 is the driving gear; 19 is the driving motor; 20 is the lifting lug; 21 is the ejecting cylinder; 22 is the positioning plate; 23 is the support flat plate; 24 is the telescopic rod; 25 is the sand cylinder; 26 is the moving frame; 27 is the moving cylinder; 28 is the sliding track; 29 is the sealing sleeve; 30 is the ventilation pipe; 31 is the sand bin; 32 is the sand injection funnel; 33 is the sand injection plate; 34 is the threaded through hole; 35 is the sand injection nozzle; 36 is the sand injection through hole; 37 is the first baffle plate; 38 is the column; 39 is the first sand injection channel; 40 is the second sand injection channel; 41 is the plug; 42 is the self-opening and closing sand injection mechanism; 43 is the connecting cylinder; 44 is the variable pitch connecting part; 45 is the control sleeve; 46 is the control piston; 47 is the elastic plug; 48 is the first through hole; 49 is the second through hole; 50 is the second baffle plate; 51 is the extrusion spring; 52 is the guide rod; 53 is the bell mouth; 54 is the guide hole; 55 is the driving spring; 56 is the pull rod; 57 is the limit post; 58 is the peristaltic piston; 59 is the return spring; 60 is the second injection hole; 61 is the sealing cylinder. Detailed implementation mode <000009**0**>The present invention will be described in detail below in conjunction with the drawings and embodiments: As Figures 1 to 17 Shown in the figure, a shell core machine with composite functions according to the present invention includes a support frame 1. A sandblasting device 2 is arranged on the upper part of the support frame 1, and the sandblasting device 2 is used for spraying sand grains and binder downward; a horizontal module support and a vertical module support are arranged on the lower part of the support frame 1. The horizontal module support includes a left mold support part 3 and a right mold support part 4 arranged corresponding to the left and right. The left mold support part 3 and the right mold support part 4 are respectively horizontally slidably and rotatably connected to the left and right ends of the corresponding support frame 1. The vertical module support includes an upper mold support part 5 and a lower mold support part 6 arranged corresponding to the upper and lower. The upper mold support part 5 is fixedly connected to the support frame 1, and the lower mold support part 6 is slidably connected to the support frame 1 up and down.

[0026] Note: There seems to be a typo in the original text where

[0025] is missing a digit in the ID in the English translation. It should be

[0025] in both the original and translated text for proper matching. I've corrected the ID number in the English translation for the sake of consistency. Also, I've assumed the "**0**" added in the ID=4 translation is a typo in the original ID numbering and removed it for translation. If these are not typos, please clarify.During the shell core casting process, when the sand casting process is needed in production, the first upper mold 7 and the first lower mold 8 are fixedly installed on the left mold support part 3 and the right mold support part 4 respectively, and the left mold support part 3 and the right mold support part 4 are driven to move inward at the same time until the inner ends of the first upper mold 7 and the first lower mold 8 are tightly attached. After the first upper mold 7 and the first lower mold 8 are tightly attached, a first shell core cavity 9 is formed inside. The upper walls of the first upper mold 7 and the first lower mold 8 are respectively provided with arc-shaped notches and a plurality of first injection holes 10 with upward openings are formed after being enclosed, that is, the first shell core cavity 9 is connected to the outside through the corresponding first injection holes 10. Then the sand blasting device 2 blasts sand downward so that sand and binder are injected through the corresponding first injection holes 10 and fill the first shell core cavity 9. After the sand and binder attached to the first shell core cavity 9 form a shell core, the first upper mold 7 and the first lower mold 8 are rotated so that the first injection hole 10 opens downward, and the unsolidified sand and binder in the first shell core cavity 9 are poured out to complete the sand casting process. When the sand casting process is not required in production, the second upper mold 11 and the second lower mold are fixedly installed on the upper mold support part 5 and the lower mold support part 6 respectively, and the lower mold support part 6 is driven to move upward until the second upper mold 11 and the inner ends of the second lower mold are tightly attached to each other, and a second shell core cavity is formed inside the second upper mold 11 and the second lower mold, and the upper wall of the second upper mold 11 is provided with a plurality of second injection holes 60 with upward openings, that is, the second shell core cavity is connected to the outside through the corresponding second injection holes 60, and then the sandblasting device 2 blasts sand downward to inject sand and binder through the corresponding second injection holes 60 and fill the second shell core cavity, and after the sand and binder attached to the inner wall of the second shell core cavity solidify, a shell core is formed; In order to facilitate the left mold support part 3 and the right mold support part 4 to complete the mold closing process, in the present invention, the left mold support part 3 includes a movable plate 12 and a rotating plate 13 arranged in parallel. The left end surface of the movable plate 12 is fixed with a movable rod 14 arranged horizontally on the left and right sides. The left end of the movable rod 14 passes through the left support frame 1 and is slidably connected to the support frame 1 left and right. The middle part of the movable plate 12 is rotatably connected to the support shaft 16. The inner end of the support shaft 16 is fixedly connected to the rotating plate 13. The outer end of the support shaft 16 is coaxially fixed with a driven gear 18; the driven gear meshes with the driving gear 18, and the driving gear 18 is coaxially fixed with the output shaft of the driving motor 19. The driving motor 19 is fixedly connected to the movable plate 12 through the motor bracket 17; the fixed end of the driving cylinder 15 is arranged at the lower part of the support frame 1, and the movable end of the driving cylinder 15 is fixedly connected to the motor bracket 17; In order to meet the versatility of equipment parts and the economy of equipment, the left mold support part 3 and the right mold support part 4 have the same structure and are symmetrically arranged on the left and right sides; the first upper mold 7 and the first lower mold 8 are driven inward by the driving cylinders 15 respectively arranged on the left and right sides; and then the first upper mold 7 and the first lower mold 8 are driven by the driving motors 19 respectively arranged on the left and right sides to complete the flipping, so that the first injection hole 10 opens downward.

[0027] When the sand casting process is required in production, the first upper mold 7 and the first lower mold 8 are fixedly installed on the inner sides of the left and right movable plates 12 respectively, and the left and right driving cylinders 15 simultaneously drive the left and right movable plates 12 to move inward, the first upper mold 7 and the first lower mold 8 are molded together and a first shell core cavity 9 is formed inside. A plurality of first injection holes 10 are formed on the upper walls of the first upper mold 7 and the first lower mold 8 and the openings are upward. Since the first shell core cavity 9 is connected to the outside through the plurality of first injection holes 10, the sand blasting device 2 then blasts downward to inject sand and adhesive into the first shell core cavity 9. The first shell core cavity 9 is filled with sand and adhesive that adhere to the first shell core cavity 9 and solidify to form a shell core. The left and right drive motors 19 simultaneously drive the corresponding driving gears 18 to rotate, and the driven gears 17 respectively engaged with the left and right driving gears 18 drive the corresponding support shafts 16 to rotate. The rotating plates 13 respectively fixed to the left and right support shafts 16 rotate, that is, the first upper mold 7 and the first lower mold 8 respectively fixed to the left and right rotating plates 13 rotate until they are set to the set position (the first injection hole 10 and the opening downward), completing the sand casting process.

[0028] In the present invention, the upper mold support portion 5 includes lugs 20, which are arranged along the four corners of the central circumference of the support frame 1, and each set of lugs 20 is respectively provided with a mold mounting through hole; the upper mold support portion 5 is used to fix and mount the second upper mold 11; In the present invention, the lower mold support part 6 includes a vertically arranged ejection cylinder 21 and a horizontally arranged positioning plate 22 connected to the moving end of the ejection cylinder 21, and the fixed end of the ejection cylinder 21 is fixed to the bottom of the support frame 1; in order to improve the stability of the lower mold support part 6; a support plate 23 is arranged parallel to the bottom of the positioning plate 22, and the support plate 23 is fixedly connected to the support frame 1, and the support plate 23 is vertically penetrated with telescopic rods 24 along the four corners, and the upper end of each group of telescopic rods 24 is fixed to the corresponding position of the positioning plate 22, and each group of telescopic rods 24 is connected to the support plate 23 for upward and downward sliding, and a clearance hole is provided at the position of the supporting plate 23 corresponding to the moving end of the ejection cylinder 21, and the moving end of the ejection cylinder 21 is fixedly connected to the positioning plate 22 through the clearance hole.

[0029] When the sand casting process is not required in production, the second upper mold 11 is fixed at the lower end of the four sets of lifting ears 20, and the second lower mold is fixed on the positioning plate 22. The ejection cylinder 21 drives the second lower mold to move upward through the positioning plate 22 until the second upper mold 11 and the inner end of the second lower mold are tightly attached. A second shell core cavity is formed inside the second upper mold 11 and the second lower mold. The second shell core cavity is connected to the outside through a second injection hole 60 with an upward opening provided on the upper wall of the second upper mold 11. Then, the sandblasting device 2 blasts sand downward to inject sand and binder into and fill the second shell core cavity. The sand and binder attached to the inner wall of the second shell core cavity are condensed to form a shell core. In the present invention, the sand blasting device 2 includes a sand cylinder 25 which is vertically arranged and has openings at both ends. A sand blasting part is arranged below the sand cylinder 25, and the sand blasting part is used to guide the sand grains and binder in the sand cylinder 25 into the first core cavity 9 and the second core cavity; A moving frame 26 is sleeved outside the sand blasting device 2. A set of moving cylinders 27 are arranged at the four corners of the moving frame 26. Each set of moving cylinders 27 is vertically arranged, and the fixed end is connected to the moving frame 26. The movable end of each set of moving cylinders 27 is connected to the sand blasting device 2. The left and right sides of the moving frame 26 are slidably connected to the front and rear of the upper part of the support frame 1 through sliding tracks 28; In order to increase the uniformity of sand blasting of the sand blasting device 2, in the present invention, the sand grains and binder in the inner cavity of the sand cylinder 25 need to enter the first core cavity 9 more uniformly under the guidance of air flow. In order to make the air flow only flow downward to guide the sand grains and binder into the first core cavity 9, a sealing part is arranged at the upper opening of the sand cylinder 25. The sealing part includes a sealing cylinder 61 which is vertically arranged, and the fixed end of the sealing cylinder 61 is fixed at the top end of the support frame 1. A sealing sleeve 29 is fixed at the movable end of the sealing cylinder 61. An air pipe 30 is also opened on one side of the sealing sleeve 29. The air pipe 30 is communicated with an air pump. The lower end face of the sealing sleeve 29 is arranged corresponding to the upper opening of the sand cylinder 25, and when the movable end of the sealing cylinder 61 is at the lower dead center, the lower end face of the sealing sleeve 29 closely adheres to the upper opening of the sand cylinder 25, so that the high-pressure gas in the air pump can enter the sand cylinder 25 through the air pipe 30; In this embodiment, in order to facilitate the injection of sand grains and binder into the sand cylinder 25, a sand bin 31 with upper and lower openings is further arranged behind the sealing sleeve 29, and the sand bin 31 is fixed to the upper part of the support frame 1; the left and right sides of the moving frame 26 are slidably connected to the front and rear of the support frame 1 through sliding tracks 28. When the sand cylinder 25 slides forward along the sliding track 28 to a set position under the drive of the track cylinder, the upper opening of the sand cylinder 25 is arranged corresponding to the sealing sleeve 29. When the sand cylinder 25 slides backward along the sliding track 28 to a set position, the upper opening of the sand cylinder 25 is arranged corresponding to the lower opening of the sand bin 31; In the first embodiment, the sandblasting part includes a sand shooting funnel 32 with openings at both the upper and lower ends. A sand shooting plate 33 is provided at the lower opening of the sand shooting funnel 32. A number of threaded through holes 34 are provided on the sand shooting plate 33. The threaded through holes 34 are arranged in a matrix. A sand shooting nozzle 35 is connected to the threaded through holes 34 by threads. The sand shooting nozzle 35 is coaxially provided with a sand shooting through hole 36. A first sand blocking plate 37 is also provided parallel above the sand shooting through hole 36. Four corners of the first sand blocking plate 37 are fixedly connected to the first sand blocking plate 37 through columns 38. And a set distance between the first sand blocking plate 37 and the sand shooting plate 33 forms a first sand shooting channel 39. The gap between the circumferential direction of the first sand blocking plate 37 and the inner cavity of the sand shooting funnel 32 forms a second sand shooting channel 40. In order to ensure that only the sand shooting through holes 36 corresponding to the first injection hole 10 or the second injection hole 60 in the matrix arrangement of the plurality of sand shooting through holes 36 are in a conducting state, each group of sand shooting through holes 36 is coaxially and detachably connected with a plug 41. In this embodiment, the detachable connection can be achieved by an insertion method. During the sandblasting process, the sandblasting device 2 moves backward to a set position, and a mixture of sand grains and binder is injected into the sand bin 31. Under the action of gravity, the mixture of sand grains and binder flows downward into the sand cylinder 25. After the sand cylinder 25 is filled with a certain amount, the sandblasting device 2 slides forward along the sliding track 28 to a set position. Since the sand grains and binder are only affected by gravity, a large amount of sand grains and binder will accumulate on the upper end surface of the first sand blocking plate 37. After removing the plug 41 corresponding to the first injection hole 10 or the second injection hole 60, the air pump connected to the air pipe 30 is turned on, so that a large amount of gas flows out through the sand cylinder 25, the sand shooting funnel 32, the second sand shooting channel 40, the first sand shooting channel 39 and the sand shooting through hole 36 corresponding to the first injection hole 10 or the second injection hole 60. At this time, a large amount of sand grains and binder flow out through the sand shooting through hole 36 along with the gas, and the sandblasting process is completed. <{

[0030] During the production process, since the distribution positions of the several first injection holes 10 or the second injection holes 60 of different shell cores are different, it is necessary to disassemble and assemble the plugs 41 at different positions every time the mold is changed. The operation is time-consuming, laborious and unsafe. In order to enable the sand shooting through holes 36 to automatically match the corresponding first injection holes 10 or second injection holes 60 and reduce the complex process of replacing the plugs 41.

[0031] In the second embodiment, the sandblasting part includes a sand shooting funnel 32 with openings at both ends, and the lower end of the inner cavity cross section of the sand shooting funnel 32 is formed into a bell mouth 53, and a sand shooting plate 33 is provided at the lower end opening of the bell mouth 53, and a second sand blocking plate 50 is provided above the sand shooting plate 33; the second sand blocking plate 50 is circumferentially fitted with the bell mouth 53 at the lower end of the inner cavity cross section of the sand shooting funnel 32 to seal the lower part of the inner cavity of the sand shooting funnel 32, and guide rods 52 are respectively provided at the left and right ends of the second sand blocking plate 50, each group of guide rods 52 is vertically arranged and the sand shooting plate 33 is fixed at the lower end, and the upper ends of the guide rods 52 are respectively passed through the left and right sides of the second sand blocking plate 50 and are slidably connected to the second sand blocking plate 50 up and down, and the guide rod 52 between the second sand blocking plate 50 and the sand shooting plate 33 is also coaxially sleeved with an extrusion spring 51, which is always in a compressed state, and the extrusion spring 51 makes the second sand blocking plate 50 fit tightly against the inner cavity of the sand shooting funnel 32; The sandblasting plate 33 is provided with a plurality of guide holes 54 arranged in a matrix, and each group of guide holes 54 extends vertically through the sandblasting plate 33. Each group of guide holes 54 is coaxially provided with a group of self-opening and closing sandblasting mechanisms 42. The upper portion of the self-opening and closing sandblasting mechanisms 42 is fixed with the second sand retaining plate 50, and the lower portion is provided corresponding to the lower opening of the guide holes 54. Each group of self-opening and closing sandblasting mechanisms 42 is slidably connected to the corresponding guide hole 54. A negative pressure switch is also provided in the inner cavity of the self-opening and closing sand shooting mechanism 42, which is used to control the position change of the lower part of the self-opening and closing sand shooting mechanism 42 and the corresponding lower end opening of the guide hole 54; when the second sand baffle 50 is in close contact with the bell mouth 53 of the inner cavity of the sand shooting funnel 32, the lower part of the self-opening and closing sand shooting mechanism 42 is in close contact with the lower end opening of the guide hole 54, and the guide hole 54 is in a closed state; when the second sand baffle 50 moves downward, there is a gap between the lower part of the self-opening and closing sand shooting mechanism 42 and the lower end opening of the guide hole 54, and a space for sand shooting is formed after the guide hole 54 is connected.

[0032] In this embodiment, the self-opening and closing sand-shooting mechanism 42 includes a connecting tube 43 with conductive connections at the upper and lower ends; a variable-distance connecting portion 44 is inserted into the upper end of the connecting tube 43, and a corresponding guide hole 54 is passed through the lower end; an elastic plug 47 is coaxially fixed to the lower end of the connecting tube 43, the upper part of the elastic plug 47 is a frustum, and the frustum is arranged corresponding to the lower end opening of the guide hole 54, and the lower part of the elastic plug 47 is a coaxially arranged cylindrical structure, which is made of an elastic material, such as rubber; a first through hole 48 is opened at the axis of the elastic plug 47 to communicate with the inner cavity of the connecting tube 43, and a second through hole 49 is opened radially at the frustum of the upper part of the elastic plug 47, and the second through hole 49 is communicated with the inner cavity of the first through hole 48; a negative pressure switch is provided in the inner cavity of the variable-distance connecting portion 44, which is used to control the change of the pressure in the inner cavity of the connecting tube 43, so that the length of the variable-distance connecting portion 44 in the vertical direction changes, thereby driving the elastic plug 47 below the variable-distance connecting portion 44 to conduct or seal the guide hole 54; The variable pitch connecting part 44 includes a control sleeve 45 and a control piston 46. The upper end surface of each control sleeve 45 is fixedly connected to the lower end surface of the second sand baffle 50. The control sleeve 45 is in the shape of a cylinder with an open lower end, and the hollow control piston 46 is inserted at the opening. A driving spring 55 is coaxially arranged on the connecting cylinder 43 at the lower end of the control piston 46. The upper end of the driving spring 55 fixes the lower end surface of the control piston 46, and the lower end of the driving spring 55 fixes the upper end surface of the sand shooting plate 33, and the driving spring 55 is always in a compressed state. During the sand shooting process, the air pump connected to the air pipe 30 is turned on, and the air pressure in the inner cavity of the sand shooting funnel 32 increases. The air pressure drives the second sand baffle 50 to move downward to compress the spring 51. Since the inner cavity of the sand shooting funnel 32 is in the shape of a flared opening 53, therefore, a gap is formed between the circumferential direction of the second sand baffle 50 and the inner cavity of the sand shooting funnel 32 to facilitate the outflow of sand grains and binder. At the same time, the second sand baffle 50 drives the variable pitch connecting part 44 downward, and the elastic plug 47 of the variable pitch connecting part 44 moves downward. A gap is formed between the elastic plug 47 and the inner cavity of the guide hole 54, so that the sand grains and binder are ejected through the gap formed between the elastic plug 47 and the inner cavity of the guide hole 54. In order to form a gap at the guide hole 54 corresponding to the first injection hole 10 or the second injection hole 60 by the elastic plug 47, and the remaining elastic plugs 47 move upward to closely fit with the lower end opening of the corresponding guide hole 54 to achieve the blocking effect. In this embodiment, the negative pressure switch is arranged in the inner cavity of the hollow control piston 46 to control the corresponding positions of the control piston 46 and the control sleeve 45 in the vertical direction. The negative pressure switch includes a peristaltic piston 58. The lower part of the peristaltic piston 58 is inserted into the upper end opening of the first through hole 48 of the connecting cylinder 43 and is slidably connected with the connecting cylinder 43 up and down. The inner ends of two groups of horizontal pull rods 56 are evenly hinged to the upper part of the peristaltic piston 58 in the circumferential direction. The outer end of each pull rod 56 is hinged with a horizontally arranged limit post 57. The outer end of the limit post 57 is spherical and the limit post 57 penetrates the side wall of the control piston 46 in the radial direction and is slidably connected with the side wall of the control piston 46. The spherical surface of the outer end of the limit post 57 abuts against the lower end of the control sleeve 45. Since the outer end surface of the limit post 57 is spherical, when the control piston 46 moves upward, the lower end of the control sleeve 45 abuts against the outer end surface of the limit post 57 and always drives the limit post 57 to move inward. When the hinge points of the two groups of horizontal pull rods 56 are at the dead center position, that is, the two groups of horizontal pull rods 56 are in a horizontal state, the two groups of limit posts 57 cannot move inward. At this time, the distance of the variable pitch connecting part 44 in the vertical direction is the longest, that is, when the second sand baffle 50 drives the variable pitch connecting part 44 downward, the elastic plug 47 at the lower end of the variable pitch connecting part 44 can move downward until the guide hole 54 is in a conducting state.

[0033] When the hinge points of the two sets of horizontal tie rods 56 and the peristaltic piston 58 move downward, the hinge points of the two sets of horizontal tie rods 56 leave the dead center position, and the two sets of horizontal tie rods 56 are no longer horizontal; since the driving spring 55 is always in a compressed state, the limiting column 57 always has a tendency to move inward; the limiting column 57 moves inward until the driving spring 55 drives the control piston 46 to slide into the control sleeve 45, and the distance of the variable pitch connecting part 44 in the vertical direction is shortened, that is, the elastic plug 47 at the lower end of the variable pitch connecting part 44 moves upward to fit with the lower end of the guide hole 54.

[0034] According to Bernoulli's law: In an ideal fluid (i.e., an incompressible and non-viscous fluid), the pressure is low where the flow velocity is high, and the pressure is high where the flow velocity is low.

[0035] After the sandblasting process is started, the self-opening and closing sand injection mechanism 42 will move downward as a whole with the sandblasting part, and the elastic plug 47 will contact the corresponding upper mold and lower mold: When the guide hole 54 corresponds to the position of a certain first injection hole 10 or second injection hole 60, at this time, the cylindrical structure in the elastic plug 47 will be inserted into the corresponding first injection hole 10 or second injection hole 60. At this time, with the air pump turned on, the air pressure will drive the second baffle plate 50 to move downward. At this time, the elastic plug 47 moves downward with the self-opening and closing sand injection mechanism 42 to cancel the blockage of the lower end opening of the guide hole 54. Since the first through hole 48 in the elastic plug 47 is communicated with the corresponding first injection hole 10 or second injection hole 60 and is conducted to the outside; when the first through hole 48 on the elastic plug 47 is conducted to the outside, at this time, the air flow used to drive the flow of sand grains and binder passes through the second through hole 49. Since the lower end of the first through hole 48 is conducted to the outside through the first injection hole 10 or second injection hole 60, the air pressure in the inner cavity of the connecting cylinder 43 is close to the atmospheric pressure. At this time, the air pressures at the upper end of the peristaltic piston 58 in the inner cavity of the control piston 46 and at the lower end of the peristaltic piston 58 in the inner cavity of the connecting cylinder 43 are both close to the atmospheric pressure. Therefore, the peristaltic piston 58 remains stationary and the hinge points of the two sets of horizontal tie rods 56 and the peristaltic piston 58 are at the dead center position. Under the action of the driving spring 55, the two sets of horizontal tie rods 56 are always in a horizontal state, and the two sets of limiting columns 57 cannot move inward. At this time, the distance of the variable pitch connecting part 44 in the vertical direction is the longest and remains stable, finally ensuring that the lower end opening of the guide hole 54 is always in an open state, so as to inject sand grains and binder condensate into the core cavity; When the guide hole 54 does not correspond to the position of any first injection hole 10 or second injection hole 60, the elastic plug 47 also moves downward to cancel the blockage of the lower end opening of the guide hole 54. However, since the lower end opening of the first through hole 48 is blocked by the corresponding upper die and lower die surfaces, the first through hole 48 on the elastic plug 47 is closed and not in communication with the outside at this time; at this time, the air flow for driving the flow of sand grains and binder still passes through the second through hole 49. However, since the lower end of the first through hole 48 is closed and not in communication with the outside, the air pressure in the inner cavity of the connecting cylinder 43 is less than the atmospheric pressure. At this time, the air pressure above the peristaltic piston 58 in the inner cavity of the control piston 46 is greater than the air pressure below the peristaltic piston 58 in the inner cavity of the connecting cylinder 43. Therefore, the peristaltic piston 58 moves downward under the action of the air pressure. At this time, the hinge points of the two groups of horizontal tie rods 56 and the peristaltic piston 58 leave the dead center position and the two groups of limit posts 57 move inward. Driven by the driving spring 55, the control piston 46 moves upward relative to the control sleeve 45, shortening the distance of the variable pitch connecting part 44 in the vertical direction, thereby realizing the upward movement of the connecting cylinder 43, and the lower end of the guide hole 54 is blocked again by the elastic plug 47.

[0036] Similarly, when the core shell cavity is completely filled with sand grains and binder condensate, the upper end surface of the sand grains and binder condensate will block the first through hole 48 on the elastic plug 47 at this time. After the lower end of the first through hole 48 is blocked, it will not be in communication with the outside. At this time, when the guide hole 54 does not correspond to the position of any first injection hole 10 or second injection hole 60, the principle is the same. The distance of the variable pitch connecting part 44 in the vertical direction will be shortened, thereby realizing the upward movement of the connecting cylinder 43, and the lower end of the guide hole 54 is blocked again by the elastic plug 47.

[0037] The design of the above mechanism and principle enables only the guide hole 54 corresponding to the position of the first injection hole 10 or the second injection hole 60 to be in a conductive state to realize the sand injection operation, and the guide hole 54 is automatically closed after the core shell cavity is filled with sand grains and binder condensate; while the guide hole 54 not corresponding to the position of the first injection hole 10 or the second injection hole 60 (blocked by the corresponding upper die and lower die surfaces) will be in a closed state after automatic adjustment.

[0038] In order to facilitate the reset of the tie rod 56 to the horizontal position; in this embodiment, a reset spring 59 is provided on the upper side of the peristaltic piston 58. The upper and lower ends of the reset spring 59 are respectively fixed to the inner top wall of the control piston 46 and the upper end surface of the peristaltic piston 58; when the reset spring 59 is in the natural state, the two groups of horizontal tie rods 56 are in the horizontal position, ensuring that the limit posts 57 cannot move inward; After sand shooting is completed, the air pump connected to the air vent pipe 30 is closed, and the air pressure inside the sand shooting funnel 32 decreases. Driven by the extrusion spring 51, the second sand baffle 50 moves upward. The control sleeve 45 fixed to the lower end of the second sand baffle 50 moves upward above the limit post 57. Since the air pressure inside the first through hole 48 returns to the atmospheric pressure at this time (there is no longer any air flow affecting the air pressure inside the first through hole 48 after the air pump is closed), the return spring 59 drives the peristaltic piston 58 to move upward. The return spring 59 returns to its natural state, both groups of pull rods 56 return to the horizontal state, and the two limit posts 57 move outward to the lower end of the control sleeve 45 respectively.

[0039] During the working process, when the sand casting process needs to be used in production, the first upper mold 7 and the first lower mold 8 are respectively fixedly installed on the inner sides of the left and right moving plates 12. The two groups of left and right driving cylinders 15 simultaneously drive the left and right moving plates 12 to move inward. The first upper mold 7 and the first lower mold 8 are closed to form a first core cavity 9 inside. A number of first injection holes 10 are formed on the upper walls of the first upper mold 7 and the first lower mold 8 and open upward. Since the first core cavity 9 is connected to the outside through a number of first injection holes 10, then the sandblasting device 2 sprays sand downward, so that the sand grains and the binder are injected into the first core cavity 9 and fill the first core cavity 9. After the sand grains and the binder that fit the first core cavity 9 solidify to form a core, the two groups of left and right driving motors 19 simultaneously drive the corresponding driving gears 18 to rotate. The driven gears 17 meshing with the two groups of left and right driving gears 18 respectively drive the corresponding support shafts 16 to rotate. The rotating plates 13 fixed to the two groups of left and right support shafts 16 respectively rotate, that is, the first upper mold 7 and the first lower mold 8 fixed to the two groups of left and right rotating plates 13 respectively rotate until the set position (the first injection hole 10 and open downward), and the sand casting process is completed.

[0040] When the sand casting process is not needed in production, the second upper mold 11 is fixed to the lower ends of the four lifting lugs 20, and the second lower mold is fixed on the positioning plate 22. The ejecting cylinder 21 drives the second lower mold to move upward through the positioning plate 22 until the inner ends of the second upper mold 11 and the second lower mold are closely attached. A second core cavity is formed inside the second upper mold 11 and the second lower mold. The second core cavity is communicated with the outside through the second injection hole 60 with an upward opening provided on the upper wall of the second upper mold 11. Then the sandblasting device 2 sprays sand downward, so that the sand grains and the binder are injected and fill the second core cavity. After the sand grains and the binder that fit the inner wall of the second core cavity solidify, a core is formed; The working process of the first embodiment is as follows: The sandblasting device 2 moves backward to the set position and injects a mixture of sand and binder into the sand bin 31. Under the action of gravity, the mixture of sand and binder flows downward into the sand cylinder 25. After the sand cylinder 25 is filled with a certain amount, the sandblasting device 2 slides forward along the sliding track 28 to the set position. Since the sand and binder are only affected by gravity, a large amount of sand and binder will accumulate on the upper end face of the first sand baffle 37. After removing the plug 41 corresponding to the first injection hole 10 or the second injection hole 60, open the air pump connected to the vent pipe 30, so that a large amount of gas flows out through the sand cylinder 25, the sand shooting funnel 32, the second sand shooting channel 40, the first sand shooting channel 39 and the sand shooting through hole 36 corresponding to the first injection hole 10 or the second injection hole 60. At this time, a large amount of sand and binder flow out through the sand shooting through hole 36 along with the gas, completing the sandblasting process.

[0041] The working process of Example 2 is as follows: The self-opening and closing sand-shooting mechanism 42 will move downward with the overall movement of the sand-blasting part, and the elastic plug 47 will contact the corresponding upper and lower molds; when the guide hole 54 corresponds to the position of a first injection hole 10 or a second injection hole 60, the cylindrical structure in the elastic plug 47 will be inserted into the corresponding first injection hole 10 or the second injection hole 60. At this time, as the air pump is turned on, the air pressure will drive the second sand baffle 50 to move downward. At this time, the elastic plug 47 moves downward with the self-opening and closing sand-shooting mechanism 42 to cancel the blockage of the lower end opening of the guide hole 54. Since the first through hole 48 in the elastic plug 47 is connected to the corresponding first injection hole 10 or the second injection hole 60 and is conductive to the outside world; when the first through hole 48 on the elastic plug 47 is conductive to the outside world, the air flow used to drive the flow of sand particles and adhesive passes through the second through hole 48. The second through hole 49, since the lower end of the first through hole 48 is connected to the outside world through the first injection hole 10 or the second injection hole 60, the air pressure in the inner cavity of the connecting tube 43 is close to atmospheric pressure. At this time, the air pressure at the upper end of the peristaltic piston 58 in the inner cavity of the control piston 46 and the lower end of the peristaltic piston 58 in the inner cavity of the connecting tube 43 are close to atmospheric pressure. Therefore, the peristaltic piston 58 remains stationary and the hinge points of the two sets of horizontal pull rods 56 and the peristaltic piston 58 are at the dead point position. Under the action of the driving spring 55, the two sets of horizontal pull rods 56 are always in a horizontal state, and the two sets of limit columns 57 cannot move inward. At this time, the distance of the variable distance connection part 44 in the vertical direction is the longest and remains stable, ultimately ensuring that the opening at the lower end of the guide hole 54 is always in an open state, thereby injecting sand and adhesive condensate into the shell core cavity; When the guide hole 54 does not correspond to the position of any first injection hole 10 or second injection hole 60, the elastic plug 47 will also move downward to cancel the blockage of the lower end opening of the guide hole 54. However, since the lower end opening of the first through hole 48 is blocked by the corresponding upper die and lower die surfaces, when the first through hole 48 on the elastic plug 47 is closed and not in communication with the outside; at this time, the air flow used to drive the flow of sand grains and binder still passes through the second through hole 49. However, since the lower end of the first through hole 48 is closed and not in communication with the outside, the air pressure in the inner cavity of the connecting cylinder 43 is less than the atmospheric pressure. At this time, the air pressure above the peristaltic piston 58 in the inner cavity of the control piston 46 is greater than the air pressure below the peristaltic piston 58 in the inner cavity of the connecting cylinder 43. Therefore, the peristaltic piston 58 moves downward under the action of the air pressure. At this time, the hinge points of the two groups of horizontal tie rods 56 and the peristaltic piston 58 leave the dead point position and the two groups of limit posts 57 move inward. Under the drive of the drive spring 55, the control piston 46 moves upward relative to the control sleeve 45, shortening the distance of the variable pitch connecting part 44 in the vertical direction, so as to realize the upward movement of the connecting cylinder 43, and the lower end of the guide hole 54 is blocked again by the elastic plug 47.

[0042] Similarly, when the core cavity is completely filled with sand grains and binder condensate, the upper end surface of the sand grains and binder condensate will block the first through hole 48 on the elastic plug 47 at this time. After the lower end of the first through hole 48 is blocked, it will not be in communication with the outside. At this time, when the guide hole 54 does not correspond to the position of any first injection hole 10 or second injection hole 60, the principle is the same. The distance of the variable pitch connecting part 44 in the vertical direction will be shortened, so as to realize the upward movement of the connecting cylinder 43, and the lower end of the guide hole 54 is blocked again by the elastic plug 47.

Claims

1. A shell core machine with composite functions, characterized in that: It includes a support frame. A sandblasting device is arranged on the upper part of the support frame, and the sandblasting device is used to spray sand grains and binder downward; a horizontal module support and a vertical module support are arranged on the lower part of the support frame. The horizontal module support includes a left mold support part and a right mold support part arranged corresponding to the left and right. And the left mold support part and the right mold support part are respectively horizontally slidably and rotatably connected to the left and right ends of the corresponding support frame. The vertical module support includes an upper mold support part and a lower mold support part arranged corresponding to the upper and lower. And the upper mold support part is fixedly connected to the support frame, and the lower mold support part is slidably connected to the support frame up and down.

2. The shell core machine with composite functions according to claim 1, characterized in that: The sandblasting device includes a sand cylinder arranged vertically and open at both ends. A sandblasting part is arranged below the sand cylinder, and the sandblasting part is used to guide the sand grains and binder in the sand cylinder into the first core cavity and the second core cavity.

3. The core shell machine with composite functions according to claim 2, characterized in that: A sealing part is arranged at the upper opening of the sand cylinder. The sealing part includes a sealing cylinder. The sealing cylinder is arranged vertically, and the fixed end of the sealing cylinder is fixed at the top of the support frame. A sealing sleeve is fixed at the moving end of the sealing cylinder. A ventilation pipe is also arranged on one side of the sealing sleeve. The ventilation pipe is communicated with an air pump. The lower end face of the sealing sleeve is arranged corresponding to the upper opening of the sand cylinder.

4. The core shell machine with composite functions according to claim 2, characterized in that: The sandblasting part includes a sand shooting funnel open at both the upper and lower ends. A sand shooting plate is arranged at the lower opening of the sand shooting funnel. A number of threaded through holes are arranged on the sand shooting plate, and the threaded through holes are arranged in a matrix. Sand shooting nozzles are connected to the threaded through holes by threads. The sand shooting nozzles are coaxially provided with sand shooting through holes; a first baffle plate is also arranged parallel above the sand shooting through holes. The four corners of the first baffle plate are fixedly connected to the first baffle plate through columns. And the distance set between the first baffle plate and the sand shooting plate forms a first sand shooting channel. The gap between the circumferential direction of the first baffle plate and the inner cavity of the sand shooting funnel forms a second sand shooting channel. In order to ensure that only the sand shooting through holes corresponding to the first injection hole or the second injection hole among the number of sand shooting through holes arranged in a matrix are in a conducting state, each group of sand shooting through holes is coaxially detachably connected with a plug. In this embodiment, the detachable connection can be realized by an inserting method.

5. The shell core machine with composite functions according to claim 2, characterized in that: The sandblasting part includes a sand shooting funnel open at both the upper and lower ends. The lower part of the inner cavity section of the sand shooting funnel is in a flared shape. A sand shooting plate is arranged at the lower opening of the flared shape. A second baffle plate is arranged above the sand shooting plate; the circumferential direction of the second baffle plate fits with the flared shape of the lower part of the inner cavity section of the sand shooting funnel. And the second baffle plate is slidably connected to the sand shooting plate up and down through a guide rod. A compression spring is also coaxially sleeved on the guide rod between the second baffle plate and the sand shooting plate. The compression spring is always in a compressed state. A number of guide holes are arranged on the sand shooting plate. The guide holes are arranged in a matrix and each group of guide holes penetrates through the sand shooting plate up and down. A set of self-opening and closing sand shooting mechanisms are coaxially arranged in each group of guide holes. The upper part of the self-opening and closing sand shooting mechanism is fixed to the second baffle plate and the lower part is arranged corresponding to the lower opening of the guide hole. Each group of self-opening and closing sand shooting mechanisms is slidably connected to the corresponding guide hole up and down.

6. The core shell machine with composite functions according to claim 5, characterized in that: A negative pressure switch is also arranged in the inner cavity of the self-opening and closing sand shooting mechanism. The negative pressure switch is used to control the position change between the lower part of the self-opening and closing sand shooting mechanism and the lower opening of the corresponding guide hole.

7. The shell core machine with composite functions according to claim 6, characterized in that: The described self-opening and closing sand shooting mechanism includes a connecting cylinder with upper and lower ends being conducting; a variable pitch connecting part is inserted at the upper end of the connecting cylinder, and a corresponding guide hole is penetrated at the lower end; an elastic plug is coaxially fixed at the lower end of the connecting cylinder. The upper part of the elastic plug is a frustum of a cone, and the frustum of the cone is arranged corresponding to the lower opening of the guide hole. The lower part of the elastic plug is a cylindrical structure arranged coaxially, and the cylindrical structure is made of elastic material; a first through hole is opened at the axis of the elastic plug to communicate with the inner cavity of the connecting cylinder, and a second through hole is radially opened at the frustum of the cone at the upper part of the elastic plug and the second through hole communicates with the inner cavity of the first through hole; a negative pressure switch is arranged in the inner cavity of the variable pitch connecting part.

8. The shell core machine with composite functions according to claim 7, characterized in that: The described variable pitch connecting part includes a control sleeve and a control piston. The upper end surface of each control sleeve is fixedly connected to the lower end surface of the second sand baffle; the control sleeve is in a cylindrical shape with an open lower end, and a hollow control piston is inserted at the opening; a driving spring is coaxially arranged on the connecting cylinder at the lower end of the control piston. The upper end of the driving spring fixes the lower end surface of the control piston, and the lower end of the driving spring fixes the upper end surface of the sand shooting plate, and the driving spring is always in a compressed state.

9. The shell core machine with composite functions according to claim 8, characterized in that: The described negative pressure switch includes a peristaltic piston. The lower part of the peristaltic piston is inserted at the upper opening of the first through hole of the connecting cylinder and is slidably connected to the connecting cylinder up and down. The inner ends of two groups of horizontal pull rods are circumferentially and evenly hinged to the upper part of the peristaltic piston. The outer end of each pull rod is hinged to a horizontally arranged limit post; the outer end of the limit post is spherical, and the limit post penetrates the side wall of the control piston radially and is slidably connected to the side wall of the control piston, and the spherical surface at the outer end of the limit post abuts against the lower end of the control sleeve.

10. The shell core machine with composite functions according to claim 9, characterized in that: A return spring is arranged above the peristaltic piston. The upper and lower ends of the return spring are respectively fixed to the inner top wall of the control piston and the upper end surface of the peristaltic piston; when the return spring is in a natural state, the two groups of horizontal pull rods are in a horizontal position.

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