Sand box and sand casting method

Abstract

The present invention provides a sand box and a sand casting method, and relates to the technical field of casting mold boxes. The purpose is to solve the technical problem that the existing sand box is not convenient for water flow to impact the sand mold. The adopted technical scheme is: the sand box includes: a front side plate and a rear side plate, a left side plate and a right side plate arranged between the front side plate and the rear side plate; the left side plate and the right side plate are respectively provided with end holes on the front and rear end surfaces; the front side plate and the rear side plate are respectively provided with a first positioning through hole corresponding to the end hole, and are adapted to support pins; the support pins constitute a hanging support for the corresponding left side plate or right side plate; the outer side surfaces of the left side plate and the right side plate are each limited by a group of connecting rods distributed in the up and down directions; the connecting rods extend in the front and back directions, and the two ends are respectively connected to the front side plate and the rear side plate. The sand box is convenient for water flow to impact the surroundings of the sand mold so that the sand mold falls off the surface of the casting, which can effectively improve the separation efficiency of the sand mold and the casting. In addition, the present invention also provides a sand casting method using the above-mentioned sand box.

Description

Technical Field

[0001] The invention relates to the technical field of casting mold boxes, in particular to a sand box and a sand mold casting method. Background Art

[0002] Sand casting refers to a casting method that produces castings in sand molds. Steel, iron and most non-ferrous alloy castings can be obtained by sand casting. The molding materials used in sand casting are cheap and easy to obtain, and it is easy to make casting molds. It can adapt to both single-piece production and batch production of castings; therefore, sand casting has long been the basic process in casting production.

[0003] Sand mold refers to the casting cavity made of foundry sand, sand binder and other auxiliary materials in a sand box. After the molten metal poured into the sand mold cools down, the formed casting needs to be separated from the sand mold. Sand casting has the problem of difficulty in separating the sand mold and the casting, especially for large castings. Operators even need to use electric hammer drills to break the sand mold to separate the sand mold and the casting; this violent separation method can easily cause damage and deformation of the casting.

[0004] To solve the above problems, our company's technicians have designed a regeneration device for used foundry sand, see the invention patent with authorization number CN110508759B for details. The regeneration device allows the used sand to impact the sand mold with the water flow to separate the sand mold from the casting, which can effectively prevent the casting from being damaged or deformed when separated from the sand mold.

[0005] However, the existing sand box cannot cooperate well with the regeneration processing device, and the separation efficiency of the sand mold and the casting needs to be further improved. Summary of the invention

[0006] The object of the present invention is to provide a sand box, which is convenient for water flow to impact the surrounding of the sand mold so that the sand mold falls off the surface of the casting, which can effectively improve the separation efficiency of the sand mold and the casting. Based on the same inventive concept, another object of the present invention is to provide a sand casting method using the above-mentioned sand box.

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] A sand box comprises: a front side plate and a rear side plate, a left side plate and a right side plate arranged between the front side plate and the rear side plate; wherein the left side plate and the right side plate are respectively provided with end holes on the front and rear end surfaces; the front side plate and the rear side plate are respectively provided with first positioning through holes corresponding to the end holes, and are adapted to support pins; the support pins constitute a hanging support for the corresponding left side plate or right side plate; the outer side surfaces of the left side plate and the right side plate are each limited by a group of connecting rods distributed in the up and down directions; the connecting rods extend in the front and rear directions, and the two ends are respectively connected to the front side plate and the rear side plate.

[0009] Optionally, the outer sides of the front side plate and the rear side plate are respectively provided with positioning pieces; the positioning pieces have a second positioning through hole for inserting a positioning pin, and the second positioning through hole extends in the up and down directions; the upper end of the positioning pin has a cap portion, and the lower section of the positioning pin is provided with a thread surrounding the circumference and is adapted to a locking nut.

[0010] Optionally, the positioning member is provided with a pin hole corresponding to the first positioning through hole; the pin hole extends from a side of the positioning member facing the first positioning through hole to the second positioning through hole in a horizontal direction; the support pin is provided in the pin hole; the support pin comprises an insertion section and a restricted section, the diameter of the insertion section is smaller than the diameter of the restricted section, the diameter of the insertion section is adapted to the aperture of the first positioning through hole, and the diameter of the restricted section is adapted to the aperture of the pin hole; the insertion section is sleeved with a compression spring, and the compression spring is limited between the outer end of the first positioning through hole and the inner end of the restricted section; when the positioning pin is inserted into the second positioning through hole, a force is applied to the outer end of the restricted section, driving the compression spring to contract, and driving the insertion section of the support pin into the end hole; when the positioning pin is disengaged from the second positioning through hole, the compression spring is reset and drives the insertion section of the support pin to disengage from the end hole.

[0011] Optionally, the positioning pin is provided with a rounded corner on the lower end edge; the restricted section of the support pin is provided with a rounded corner on the outer end edge.

[0012] Optionally, the front side plate and the rear side plate are respectively installed with limit rods for supporting the casting; the front side plate and the rear side plate are respectively provided with limit through holes for the limit rods to pass through, and each has an internal threaded tube installed at the limit through holes on the outer side; the limit rod is provided with a thread matching the internal threaded tube; the internal threaded tube has a first ear portion, and is connected to the front side plate or the rear side plate by a first bolt provided on the first ear portion.

[0013] Optionally, the connecting rod is detachably connected to the front side plate and the rear side plate; the connecting rod includes a rear end head, a rod body, and a front end head with decreasing diameters; the front side plate has a first through hole for the front end head to pass through, and the aperture of the first through hole is smaller than the diameter of the rod body; the front end head is provided with a thread surrounding the circumference and is adapted to a first nut; the rear side plate has a second through hole for the rod body to pass through, and the aperture of the second through hole is smaller than the diameter of the rear end head.

[0014] Optionally, a first limiting groove is provided on the outer side surface of the front side plate at the first through hole; a first hanging piece is installed on the front end head, and the first hanging piece has a first center hole for the front end head to pass through; the inner end of the first hanging piece has a first limiting portion inserted into the first limiting groove, and the first limiting groove and the first limiting portion are arranged to form a matching prism shape; the first hanging piece is provided with a first annular groove surrounding the outer circumference; and the first nut tightens the first hanging piece.

[0015] Optionally, a second limiting groove is provided on the outer side surface of the rear side plate at the second through hole; a second hanging piece is installed on the rear end head, and the second hanging piece has a second center hole for the rear end head to pass through; the inner end of the second hanging piece has a second limiting portion inserted into the second limiting groove, and the second limiting groove and the second limiting portion are arranged to form matching prism shapes; the second hanging piece is provided with a second annular groove surrounding the outer circumference; the rear end head is provided with a thread surrounding the outer circumference and is adapted to a second nut; the second nut forms a tight contact against the second hanging piece.

[0016] The present application also provides a sand casting method, which uses the aforementioned sand box and includes the following steps:

[0017] S1: Coat a layer of clay on the inner side of the left side plate and the right side plate; place the left side plate and the right side plate between the front side plate and the rear side plate, and make the outer side of the left side plate and the right side plate respectively abut against the corresponding connecting rod to complete the assembly of the sand box;

[0018] S2: putting the model into a sand box; mixing the casting sand, the molding sand binder and the auxiliary materials, filling the sand box, pressing and solidifying to form a sand mold;

[0019] S3: stacking the sand boxes with the sand molds on top of each other; aligning the second positioning through holes of the corresponding positioning members of the adjacent sand boxes, and installing the positioning pins to complete the box assembly;

[0020] S4: Pour the molten metal into the assembled sand mold until it is completely filled;

[0021] S5: After the molten metal is cooled in the sand mold and solidified into a casting, the positioning pin is removed; the sand box is suspended in the air by clamping the first lifting member and the second lifting member; the water flow carrying the old sand is made to impact downward along the inner side of the left plate and the right plate to wash away the clay coated on the left plate and the right plate, so that the left plate and the right plate fall off from the sand box;

[0022] S6: The water flow carrying the old sand is made to impact the casting from top to bottom and left to right to scatter the sand mold, thereby completing the separation of the sand mold and the casting;

[0023] Among them, after the sand box is assembled and before it is closed, when it needs to be moved, first insert the positioning pin into the second positioning through hole of the positioning piece to drive the insertion section of the support pin into the end hole, thereby hanging and supporting the left and right plates to prevent the left and right plates from falling off the sand box.

[0024] Optionally, step S2 also includes: placing the model into a sand box; mixing the casting sand with the molding sand binder and auxiliary materials, filling the sand box, pressing and curing to form a sand core; the core head of the sand core faces the left plate or the right plate; step S3 also includes: arranging the sand box with the sand core between the sand boxes with the sand mold.

[0025] The beneficial effects of the present invention are concentrated in: when using the sand box to manufacture sand molds or sand cores, first apply a layer of clay on the inner side of the left plate and the right plate, and then fill the sand box with casting sand mixed with the molding sand binder; in this way, the casting sand and the molding sand binder are prevented from directly contacting the left plate and the right plate, and the left plate and the right plate can be loosened more easily. When the molten metal cools in the sand mold and solidifies into a casting; the support pin is withdrawn from the end hole, so that the left plate and the right plate lose support; the water flow carrying the old sand impacts the clay coated on the left plate and the right plate, so that the left plate and the right plate can fall off from the sand box. In this way, the top, bottom, left and right of the sand box are all exposed, and can be impacted by the water flow carrying the old sand; in the process of water flow impact, the old sand will not be silted up in the sand box, ensuring the separation effect of the water flow impact, which is conducive to improving the separation efficiency of the sand mold and the casting. In addition, the sand box is particularly suitable for casting a casting with a cavity, so that the core head of the sand core faces the left plate or the right plate; in this way, the cavity of the casting will face the left plate or the right plate. The left plate and the right plate are made to fall off from the sand box; the water flow carrying the old sand can impact the sand core in the cavity of the casting from the cavity of the casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 It is the structural schematic diagram of the sand box;

[0028] Figure 2 It is a schematic diagram of the assembly of the front side plate and the support pin;

[0029] Figure 3 It is a schematic diagram of the assembly of the rear side plate and the support pin;

[0030] Figure 4 It is a schematic diagram of the assembly of the front side plate and the positioning piece;

[0031] Figure 5 for Figure 4 Enlarged view of part A in the middle;

[0032] Figure 6 It is a schematic diagram of the assembly of the support pin, the positioning member, the positioning pin and the compression spring;

[0033] Figure 7 This is a schematic diagram of installing an internal threaded barrel on the front side plate of the sand box;

[0034] Figure 8 It is a schematic diagram of the assembly of the front side plate, the rear side plate and the connecting rod;

[0035] Fig. 9 A schematic diagram of providing a second limiting groove for the rear side plate;

[0036] Fig.10 It is a schematic diagram of the structure after two sand boxes are combined;

[0037] Fig.11 This is a schematic diagram of the structure after the three sand boxes are combined.

[0038] 1. The front side plate; 2. The rear side plate; 3. The left side plate; 4. The right side plate; 5. The end hole; 6. The first positioning through hole; 7. The support pin; 8. The connecting rod; 9. The positioning member; 10. The positioning pin; 11. The second positioning through hole; 12. The pin hole; 13. The insertion section; 14. The restricted section; 15. The compression spring; 16. The limiting rod; 17. The internal threaded cylinder; 18. The rear end head; 19. The rod body; 20. The front end head; 21. The first through hole; 22. The first nut; 23. The second through hole; 24. The first limiting groove; 25. The first lifting member; 26. The first restricted portion; 27. The first annular groove; 28. The second limiting groove; 29. ​​The second lifting member; 30. The second restricted portion; 31. The second annular groove; 32. The second nut; 33. The placeholder rod. DETAILED DESCRIPTION

[0039] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0040] In the description of the present invention, it should be understood that the terms "front", "rear", "left", "right" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0041] In the description of the present invention, it is necessary to understand that the end facing the inside of the sand box is the inner end, and the side facing the inside of the sand box is the inner side, and vice versa. Therefore, the left side of the left side plate 3 is the outer side, and the right side is the inner side; the left side of the right side plate 4 is the inner side, and the right side is the outer side; the front side of the front side plate 1 is the outer side, and the rear side is the inner side; the front side of the rear side plate 2 is the inner side, and the rear side is the outer side.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0043] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0045] Example 1

[0046] like Figure 1 to Figure 3As shown, an embodiment of the present invention provides a sand box. The sand box includes: a front side panel 1 and a rear side panel 2, a left side panel 3 and a right side panel 4 arranged between the front side panel 1 and the rear side panel 2. The left side panel 3 and the right side panel 4 are provided with end holes 5 on the front and rear end surfaces, respectively. It should be understood that the left side panel 3 and the right side panel 4 are usually provided with end holes 5 on the upper and lower parts of the front and rear end surfaces, respectively. In addition, the left side panel 3 and the right side panel 4 can also be provided with transverse folding parts at the front and rear ends, respectively, and the end hole 5 is provided in the transverse folding part. The front side panel 1 and the rear side panel 2 are respectively provided with a first positioning through hole 6 corresponding to the end hole 5, and are adapted with a support pin 7. The support pin 7 constitutes a hanging support for the corresponding left side panel 3 or right side panel 4. It should be understood that by passing the support pin 7 through the first positioning through hole 6 and inserting it into the end hole 5, the corresponding left side plate 3 or right side plate 4 can be suspended and supported; the end hole 5 is usually set as a blind hole, so that the casting sand and the molding sand binder filled in the sand box can be prevented from contacting the support pin 7, and the support pin 7 can be prevented from being difficult to withdraw from the end hole 5 due to the curing and bonding of the sand mold. The width of the end hole 5 in the left and right directions is greater than the diameter of the support pin 7. The support pin 7 only plays the role of hanging the left side plate 3 or the right side plate 4, and does not limit the left side plate 3 or the right side plate 4 in the left and right directions; the left side plate 3 and the right side plate 4 are each limited in the left and right directions by the outer connecting rod 8 and the casting sand filled inside; this makes it easier for the support pin 7 to withdraw from the end hole 5, and it is easier and more convenient to separate the left side plate 3 and the right side plate 4 from the sand box; and it can prevent the support pin 7 from being deformed, which is conducive to extending the service life of the support pin 7. The outer side surfaces of the left side plate 3 and the right side plate 4 are each limited by a group of connecting rods 8 distributed in the up and down directions. The connecting rod 8 extends in the front-to-back direction, and its two ends are connected to the front side plate 1 and the rear side plate 2 respectively.

[0047] The specific implementation of the sand box is described below: When using the sand box to make sand molds or sand cores, first apply a layer of clay on the inner side of the left side plate 3 and the right side plate 4, and then fill the sand box with casting sand mixed with the molding sand binder; in this way, the casting sand and the molding sand binder are prevented from directly contacting the left side plate 3 and the right side plate 4, so that the left side plate 3 and the right side plate 4 can be loosened more easily. When the molten metal cools in the sand mold and solidifies into a casting; the support pin 7 is withdrawn from the end hole 5, so that the left side plate 3 and the right side plate 4 lose support; the water flow carrying the old sand impacts the clay coated on the left side plate 3 and the right side plate 4, so that the left side plate 3 and the right side plate 4 can fall off from the sand box. In this way, the top, bottom, left and right of the sand box are all exposed, and can be impacted by the water flow carrying the old sand; in the process of water flow impact, the old sand will not be silted up in the sand box, ensuring the separation effect of water flow impact, which is conducive to improving the separation efficiency of the sand mold and the casting. In addition, the sand box is particularly suitable for casting castings with cavities, so that the core head of the sand core faces the left plate 3 or the right plate 4; in this way, the cavity of the casting will face the left plate 3 or the right plate 4. The left plate 3 and the right plate 4 are made to fall off from the sand box; the water flow carrying the old sand can impact the sand core in the cavity of the casting from the cavity of the casting. The sand boxes used in the prior art mostly use an integrated frame that cannot be disassembled, and it is difficult to expose the cavity of the casting. The water flow carrying the old sand cannot impact the sand core in the cavity of the casting from the cavity of the casting. Therefore, the sand box can be better used in conjunction with the regeneration and processing device for casting old sand designed by our company's technicians; the structure of the regeneration and processing device is detailed in the invention patent with authorization number CN110508759B. Of course, the sand box can also be used in conjunction with other devices with similar functions in similar scenarios to achieve the separation of sand molds and castings.

[0048] Example 2

[0049] As shown in Figure 1, Figure 4 , Figure 5 As shown, on the basis of Example 1, the outer sides of the front side plate 1 and the rear side plate 2 are respectively provided with positioning members 9; the positioning member 9 has a second positioning through hole 11 for inserting the positioning pin 10, and the second positioning through hole 11 extends in the up and down directions; the upper end of the positioning pin 10 has a cap portion, and the lower section of the positioning pin 10 is provided with a thread surrounding the circumference and is adapted to a locking nut.

[0050] It should be understood that, through the cooperation between the positioning member 9 and the positioning pin 10, the positioning of adjacent flasks can be achieved during the assembling process.

[0051] Example 3

[0052] like Figures 4 to 6As shown, on the basis of Example 2, the positioning member 9 is provided with a pin hole 12 corresponding to the first positioning through hole 6; the pin hole 12 extends from the side of the positioning member 9 facing the first positioning through hole 6 to the second positioning through hole 11 in the horizontal direction; the support pin 7 is arranged in the pin hole 12; the support pin 7 includes an insertion section 13 and a restricted section 14, the diameter of the insertion section 13 is smaller than the diameter of the restricted section 14, the diameter of the insertion section 13 is adapted to the aperture of the first positioning through hole 6, and the diameter of the restricted section 14 is adapted to the aperture of the first positioning through hole 6. The aperture of the pin hole 12 is adapted; the insertion section 13 is sleeved with a compression spring 15, and the compression spring 15 is limited between the outer end of the first positioning through hole 6 and the inner end of the restricted section 14; when the positioning pin 10 is inserted into the second positioning through hole 11, a force is applied to the outer end of the restricted section 14, driving the compression spring 15 to contract and drive the insertion section 13 of the support pin 7 into the end hole 5; when the positioning pin 10 is disengaged from the second positioning through hole 11, the compression spring 15 is reset and drives the insertion section 13 of the support pin 7 to disengage from the end hole 5.

[0053] It should be understood that the compression spring 15 is accommodated in the pin hole 12. When the box is closed, the positioning pin 10 is inserted into the second positioning through hole 11, so that the insertion section 13 of the support pin 7 is inserted into the end hole 5, thereby forming a hanging support for the corresponding left side plate 3 or right side plate 4. In addition, when the sand box is transported, the positioning pin 10 can also be inserted into the second positioning through hole 11, so that the insertion section 13 of the support pin 7 is inserted into the end hole 5, forming a hanging support for the corresponding left side plate 3 or right side plate 4, thereby preventing the left side plate 3 and the right side plate 4 from falling off during the process of transporting the sand box. The positioning pin 10 is pulled out of the second positioning through hole 11, and the insertion section 13 of the support pin 7 can be withdrawn from the end hole 5 under the drive of the compression spring 15, so that the left side plate 3 or the right side plate 4 can be pulled out or fall off from the sand box. In addition, a second ear portion can be provided on the positioning member 9, so that the positioning member 9 is connected to the corresponding front side plate 1 or rear side plate 2 through a second bolt provided on the second ear portion. The size of the support pin 7 is small, and the support pin 7 is restricted in the pin hole 12 of the positioning member 9 to prevent the support pin 7 from being lost. By inserting and withdrawing the positioning pin 10, the support pin 7 is controlled to enter and exit the end hole 5, which is not only easy to operate, but also convenient for the staff to observe and determine the state of the support pin 7.

[0054] Example 4

[0055] like Figure 5 , Figure 6 As shown, on the basis of Embodiment 3, the positioning pin 10 is provided with a rounded corner at the lower end edge; the restricted section 14 of the support pin 7 is provided with a rounded corner at the outer end edge.

[0056] It should be understood that, with the above structure, when the positioning pin 10 is inserted downward into the second positioning through hole 11 , the support pin 7 can be more easily driven to move in the horizontal direction along the pin hole 12 to be inserted into the end hole 5 .

[0057] Example 5

[0058] like Figure 1 , Figure 7 , Fig.10 , Fig.11 As shown, on the basis of Example 3 or Example 4, the front side plate 1 and the rear side plate 2 are respectively installed with a limit rod 16 for supporting the casting; the front side plate 1 and the rear side plate 2 are respectively provided with a limit through hole for the limit rod 16 to pass through, and each has an internal threaded tube 17 installed at the limit through hole on the outer side; the limit rod 16 is provided with a thread matching the internal threaded tube 17; the internal threaded tube 17 has a first ear portion, and is connected to the front side plate 1 or the rear side plate 2 by a first bolt provided on the first ear portion.

[0059] It should be understood that when the water flow carrying the old sand impacts the sand mold in the sand box, the limit rod 16 can support and limit the casting in the sand box to prevent the casting from falling out of the sand box. The limit rod 16 should be flexibly arranged based on the shape of the casting to avoid the sand mold cavity; the internal threaded cylinder 17 without the limit rod 16 can be installed with a threaded placeholder rod 33; the length of the placeholder rod 33 is shorter than the limit rod 16, which can avoid extending into the sand mold cavity. When the sand box is repeatedly used to produce castings of the same shape, there is no need to repeatedly disassemble and assemble the limit rod 16 and the placeholder rod 33; the model can be placed on the workbench first, and then the sand box can be placed on the workbench, and then the sand mixed with the molding sand binder can be filled into the sand box.

[0060] Example 6

[0061] like Figure 8 , Fig. 9 As shown, on the basis of Example 5, the connecting rod 8 is detachably connected to the front side plate 1 and the rear side plate 2; the connecting rod 8 includes a rear end head 18, a rod body 19, and a front end head 20 with decreasing diameters; the front side plate 1 has a first through hole 21 for the front end head 20 to pass through, and the aperture of the first through hole 21 is smaller than the diameter of the rod body 19; the front end head 20 is provided with a thread surrounding the circumference and is adapted to a first nut 22; the rear side plate 2 has a second through hole 23 for the rod body 19 to pass through, and the aperture of the second through hole 23 is smaller than the diameter of the rear end head 18.

[0062] It should be understood that when a certain connecting rod 8 is damaged or deformed, the front end 20 of the connecting rod 8 can be knocked to make it withdraw backward from the first through hole 21 of the front side plate 1, and the connecting rod 8 can be pulled out backward, thereby replacing a new connecting rod 8. In this process, there is no need to disassemble other connecting rods 8, let alone disassemble the entire sand box. Make the connecting rod 8 pass through the second through hole 23 and the first through hole 21 from back to front in sequence, and install the first nut 22 to complete the connection between the connecting rod 8 and the front side plate 1 and the rear side plate 2. The connecting rod 8, the front side plate 1, and the rear side plate 2 are set to a detachable structure; damaged parts can be replaced individually, which is conducive to reducing maintenance costs; in addition, the size of the sand box can be easily modified by replacing parts at a later stage.

[0063] Example 7

[0064] like Figure 8 , Fig. 9 As shown, on the basis of Example 6, the outer side surface of the front side plate 1 is provided with a first limiting groove 24 at the first through hole 21; the front end head 20 is installed with a first hanging component 25, and the first hanging component 25 has a first center hole for the front end head 20 to pass through; the inner end of the first hanging component 25 has a first limiting portion 26 inserted into the first limiting groove 24, and the first limiting groove 24 and the first limiting portion 26 are arranged to be matched with each other in a prism shape; the first hanging component 25 is provided with a first annular groove 27 surrounding the outer circumference; the first nut 22 is tightened against the first hanging component 25.

[0065] It should be understood that the first annular groove 27 of the first hoisting member 25 is used to wrap the hoisting rope of the crane so that the crane can transport the sand box in the workshop. Through the cooperation of the first restricted portion 26 and the first limiting groove 24, the first hoisting member 25 can be prevented from rotating around the front end 20 to prevent the first nut 22 from loosening due to the rotation of the first hoisting member 25 during the hoisting process. In addition, when the sand box is used in conjunction with the regeneration and processing device for casting waste sand with authorization number CN110508759B, the first hoisting member 25 can cooperate with the first clamping member of the regeneration and processing device to achieve clamping of the sand box, thereby suspending the sand box in the air.

[0066] Example 8

[0067] like Figure 8 , Fig. 9As shown, on the basis of Example 7, the outer side surface of the rear side plate 2 is provided with a second limiting groove 28 at the second through hole 23; the rear end head 18 is installed with a second hanging piece 29, and the second hanging piece 29 has a second center hole for the rear end head 18 to pass through; the inner end of the second hanging piece 29 has a second limiting portion 30 inserted into the second limiting groove 28, and the second limiting groove 28 and the second limiting portion 30 are arranged to be matched with each other in a prism shape; the second hanging piece 29 is provided with a second annular groove 31 surrounding the outer circumference; the rear end head 18 is provided with a thread surrounding the outer circumference and is matched with a second nut 32; the second nut 32 is pressed against the second hanging piece 29.

[0068] It should be understood that the second annular groove 31 of the second hoisting member 29 is used to wrap the hoisting rope of the crane so that the crane can transport the sand box in the workshop. The cooperation between the second restricted portion 30 and the second limiting groove 28 can prevent the second hoisting member 29 from rotating around the front end 20, so as to avoid the second nut 32 from loosening due to the rotation of the second hoisting member 29 during the hoisting process. In addition, when the sand box is used in conjunction with the regeneration and processing device for casting waste sand with the authorization number CN110508759B, the second hoisting member 29 can cooperate with the second clamping member of the regeneration and processing device to achieve the clamping of the sand box, thereby suspending the sand box in the air.

[0069] Example 9

[0070] The embodiment of the present invention provides a sand casting method, which uses the sand box described in Example 8 and includes the following steps:

[0071] S1: Coat a layer of clay on the inner side of the left side plate 3 and the right side plate 4; place the left side plate 3 and the right side plate 4 between the front side plate 1 and the rear side plate 2, and make the outer side of the left side plate 3 and the right side plate 4 respectively abut against the corresponding connecting rod 8 to complete the assembly of the sand box.

[0072] S2: Put the model into the sand box; mix the casting sand with the molding sand binder and auxiliary materials, fill them into the sand box, press and solidify them to make a sand mold.

[0073] S3: stack the sand boxes with the sand molds up and down; align the second positioning holes 11 of the corresponding positioning members 9 of the adjacent sand boxes, and install the positioning pins 10 to complete the box closing. It should be understood that for solid castings, two sand boxes are usually used for closing.

[0074] S4: Pour the molten metal into the assembled sand mold until it is completely filled.

[0075] S5: After the molten metal is cooled in the sand mold and solidified into a casting, the positioning pin 10 is removed; the sand box is suspended in the air by clamping the first hanging member 25 and the second hanging member 29; the water flow carrying the old sand is made to impact downward along the inner side surfaces of the left plate 3 and the right plate 4 to wash away the clay coated on the left plate 3 and the right plate 4, so that the left plate 3 and the right plate 4 fall off from the sand box.

[0076] S6: Let the water flow carrying the old sand impact the top, bottom, left, and right of the casting to scatter the sand mold, thereby completing the separation of the sand mold and the casting. It should be understood that the water flow carrying the old sand can be sprayed to the top, bottom, left, and right of the casting at the same time; or the water flow carrying the old sand can be sprayed from top to bottom, and the sand box can be rotated with the casting at the bottom; both methods can make the water flow carrying the old sand impact the top, bottom, left, and right of the casting.

[0077] Among them, after the sand box is assembled and before it is closed, when it needs to be moved, the positioning pin 10 is first inserted into the second positioning through hole 11 of the positioning piece 9 to drive the insertion section 13 of the support pin 7 into the end hole 5, thereby suspending and supporting the left side plate 3 and the right side plate 4 to prevent the left side plate 3 and the right side plate 4 from falling off the sand box.

[0078] Example 10

[0079] Based on Example 9, step S2 also includes: placing the model into a sand box; mixing the casting sand with the molding sand binder and auxiliary materials, filling the sand box, pressing and curing to form a sand core; the core head of the sand core faces the left plate 3 or the right plate 4; step S3 also includes: arranging the sand box with the sand core between the sand boxes with the sand mold.

[0080] It should be understood that for hollow castings, one or two sand boxes are usually required to be added to the solid castings for making sand cores. When the boxes are combined, the sand box with the sand core needs to be placed between the two sand boxes with the sand mold. The core head of the sand core is directed toward the left plate 3 or the right plate 4; the cavity of the casting formed after the molten metal is poured into the sand mold will be directed toward the left plate 3 or the right plate 4; the left plate 3 and the right plate 4 are allowed to fall off from the sand box; the water flow carrying the old sand can impact the sand core in the cavity of the casting from the cavity of the casting; so that the sand core in the cavity of the casting is collapsed and falls off. In addition, the advantage of the sand casting method is mainly that the left plate 3 and the right plate 4 of the sand box are easy to fall off or disassemble to expose the top, bottom, left and right of the casting, so as to facilitate the water flow carrying the old sand to impact the sand mold on the surface of the casting and the sand core in the cavity of the casting; other operating details of the sand casting method not related to the improvement points of the present application can be implemented with reference to the prior art and will not be repeated here.

[0081] Embodiment 11

[0082] like Figure 1 , Figure 7 , Fig.10 , Fig.11 As shown, on the basis of Example 1 or Example 2, the front side plate 1 and the rear side plate 2 are respectively installed with a limit rod 16 for supporting the casting; the front side plate 1 and the rear side plate 2 are respectively provided with a limit through hole for the limit rod 16 to pass through, and each has an internal threaded tube 17 installed at the limit through hole on the outer side; the limit rod 16 is provided with a thread matching the internal threaded tube 17; the internal threaded tube 17 has a first ear portion, and is connected to the front side plate 1 or the rear side plate 2 by a first bolt provided on the first ear portion.

[0083] Example 12

[0084] like Figure 8 , Fig. 9 As shown, based on any one of Example 1, Example 2, Example 3, Example 4, and Example 11, the connecting rod 8 is detachably connected to the front side plate 1 and the rear side plate 2; the connecting rod 8 includes a rear end head 18, a rod body 19, and a front end head 20 with decreasing diameters; the front side plate 1 has a first through hole 21 for the front end head 20 to pass through, and the aperture of the first through hole 21 is smaller than the diameter of the rod body 19; the front end head 20 is provided with a thread surrounding the circumference and is adapted to a first nut 22; the rear side plate 2 has a second through hole 23 for the rod body 19 to pass through, and the aperture of the second through hole 23 is smaller than the diameter of the rear end head 18.

[0085] Example 13

[0086] like Figure 8 , Fig. 9 As shown, on the basis of Example 12, the outer side surface of the front side plate 1 is provided with a first limiting groove 24 at the first through hole 21; the front end head 20 is installed with a first hanging component 25, and the first hanging component 25 has a first center hole for the front end head 20 to pass through; the inner end of the first hanging component 25 has a first limiting portion 26 inserted into the first limiting groove 24, and the first limiting groove 24 and the first limiting portion 26 are arranged to be matched with each other in a prism shape; the first hanging component 25 is provided with a first annular groove 27 surrounding the outer circumference; the first nut 22 is tightened against the first hanging component 25.

[0087] Embodiment 14

[0088] like Figure 8 , Fig. 9As shown, on the basis of Example 13, the outer side surface of the rear side plate 2 is provided with a second limiting groove 28 at the second through hole 23; the rear end head 18 is installed with a second hanging piece 29, and the second hanging piece 29 has a second center hole for the rear end head 18 to pass through; the inner end of the second hanging piece 29 has a second limiting portion 30 inserted into the second limiting groove 28, and the second limiting groove 28 and the second limiting portion 30 are arranged to be matched with each other in a prism shape; the second hanging piece 29 is provided with a second annular groove 31 surrounding the periphery; the rear end head 18 is provided with a thread surrounding the periphery and is matched with a second nut 32; the second nut 32 is pressed against the second hanging piece 29.

[0089] Although specific embodiments of the present invention are described above, those skilled in the art should understand that various changes or modifications may be made to these embodiments without departing from the principles and essence of the present invention, and these changes and modifications are all within the scope of protection of the present invention.

Claims

1. Sand box, characterized in that, include: A front side panel (1) and a rear side panel (2); and A left side plate (3) and a right side plate (4) arranged between the front side plate (1) and the rear side plate (2); in, The left side plate (3) and the right side plate (4) are provided with end holes (5) on the front and rear end surfaces respectively; The front side plate (1) and the rear side plate (2) are respectively provided with a first positioning through hole (6) corresponding to the end hole (5), and are adapted to have a support pin (7); the support pin (7) forms a hanging support for the corresponding left side plate (3) or right side plate (4); The outer side surfaces of the left side plate (3) and the right side plate (4) are each limited by a group of connecting rods (8) distributed in the up-down direction; The connecting rod (8) extends in the front-to-back direction, and its two ends are respectively connected to the front side plate (1) and the rear side plate (2); Positioning pieces (9) are respectively provided on the outer sides of the front side plate (1) and the rear side plate (2); The positioning member (9) has a second positioning through hole (11) for inserting the positioning pin (10), and the second positioning through hole (11) extends in the up-down direction; The upper end of the positioning pin (10) is provided with a cap portion, and the lower section of the positioning pin (10) is provided with a thread surrounding the circumference and adapted to fit a locking nut; The positioning member (9) is provided with a pin hole (12) corresponding to the first positioning through hole (6); the pin hole (12) extends from a side of the positioning member (9) facing the first positioning through hole (6) to the second positioning through hole (11) along a horizontal direction; the support pin (7) is arranged in the pin hole (12); The support pin (7) comprises an insertion section (13) and a restricted section (14); the diameter of the insertion section (13) is smaller than the diameter of the restricted section (14); the diameter of the insertion section (13) matches the diameter of the first positioning through hole (6); and the diameter of the restricted section (14) matches the diameter of the pin hole (12); The insertion section (13) is sleeved with a compression spring (15), and the compression spring (15) is limited between the outer end of the first positioning through hole (6) and the inner end of the restricted section (14); When the positioning pin (10) is inserted into the second positioning through hole (11), a force is applied to the outer end of the restricted section (14), driving the compression spring (15) to contract and driving the insertion section (13) of the support pin (7) into the end hole (5); When the positioning pin (10) is disengaged from the second positioning through hole (11), the compression spring (15) is reset and drives the insertion section (13) of the support pin (7) to be disengaged from the end hole (5); The connecting rod (8) is detachably connected to the front side plate (1) and the rear side plate (2); The connecting rod (8) comprises a rear end head (18) with decreasing diameter, a rod body (19), and a front end head (20); The front side plate (1) has a first through hole (21) for the front end head (20) to pass through, and the diameter of the first through hole (21) is smaller than the diameter of the rod body (19); The front end head (20) is provided with a thread surrounding the circumference and is adapted to fit the first nut (22); The rear side plate (2) has a second through hole (23) for the rod body (19) to pass through, and the diameter of the second through hole (23) is smaller than the diameter of the rear end head (18); The outer side surface of the front side plate (1) is provided with a first limiting groove (24) at the first through hole (21); The front end head (20) is installed with a first hanging piece (25), and the first hanging piece (25) has a first central hole for the front end head (20) to pass through; The inner end of the first hanging member (25) has a first limiting portion (26) inserted into the first limiting groove (24), and the first limiting groove (24) and the first limiting portion (26) are arranged in a matching prism shape; The first hanging member (25) is provided with a first annular groove (27) surrounding the outer circumference; The first nut (22) is pressed against the first hanging member (25).

2. The flask according to claim 1, characterized in that: The positioning pin (10) is provided with a rounded corner at the lower end edge; the restricted section (14) of the support pin (7) is provided with a rounded corner at the outer end edge.

3. The flask according to claim 1 or 2, characterized in that: The front side plate (1) and the rear side plate (2) are respectively provided with limit rods (16) for supporting the casting; The front side plate (1) and the rear side plate (2) are respectively provided with a limiting through hole for the limiting rod (16) to pass through, and an internal threaded cylinder (17) is installed at the limiting through hole on the outer side surface of each. The limiting rod (16) is provided with a thread matching the internal threaded cylinder (17); The internal threaded tube (17) has a first ear portion and is connected to the front side plate (1) or the rear side plate (2) via a first bolt arranged on the first ear portion.

4. The flask according to claim 3, characterized in that: The outer side surface of the rear side plate (2) is provided with a second limiting groove (28) at the second through hole (23); The rear end head (18) is installed with a second hanging piece (29), and the second hanging piece (29) has a second center hole for the rear end head (18) to pass through; The inner end of the second hanging member (29) has a second limiting portion (30) inserted into the second limiting groove (28), and the second limiting groove (28) and the second limiting portion (30) are arranged in a matching prism shape; The second hanging member (29) is provided with a second annular groove (31) surrounding the outer circumference; The rear end head (18) is provided with a thread surrounding the outer circumference and is adapted to fit a second nut (32); The second nut (32) is pressed against the second hanging member (29).

5. Sand casting method, characterized in that: The sand box according to claim 4 is used, and includes the following steps: S1: coating the inner side of the left side plate (3) and the right side plate (4) with a layer of clay; placing the left side plate (3) and the right side plate (4) between the front side plate (1) and the rear side plate (2), and making the outer side of the left side plate (3) and the right side plate (4) respectively abut against the corresponding connecting rod (8) to complete the assembly of the sand box; S2: putting the model into a sand box; mixing the casting sand, the molding sand binder and the auxiliary materials, filling the sand box, pressing and solidifying to form a sand mold; S3: stacking the sand boxes with the sand molds on top of each other; aligning the second positioning holes (11) of the corresponding positioning members (9) of the adjacent sand boxes, and installing the positioning pins (10) to complete the box assembly; S4: Pour the molten metal into the assembled sand mold until it is completely filled; S5: After the molten metal is cooled in the sand mold and solidified into a casting, the positioning pin (10) is removed; the sand box is suspended in the air by clamping the first hanging member (25) and the second hanging member (29); the water flow carrying the old sand is made to impact downward along the inner side surfaces of the left plate (3) and the right plate (4) to wash away the clay coated on the left plate (3) and the right plate (4), so that the left plate (3) and the right plate (4) fall off from the sand box; S6: The water flow carrying the old sand is made to impact the casting from top to bottom and left to right to scatter the sand mold, thereby completing the separation of the sand mold and the casting; When the sand box needs to be moved after the sand box is assembled and before it is closed, a positioning pin (10) is first inserted into the second positioning through hole (11) of the positioning member (9) to drive the insertion section (13) of the support pin (7) into the end hole (5), thereby suspending and supporting the left side plate (3) and the right side plate (4) to prevent the left side plate (3) and the right side plate (4) from falling off the sand box.

6. The sand casting method according to claim 5, characterized in that: Step S2 also includes: placing the model into a sand box; mixing the casting sand, the molding sand binder and the auxiliary materials, filling the sand box, pressing and solidifying the mixture to form a sand core; the core head of the sand core faces the left plate (3) or the right plate (4); Step S3 also includes: arranging the sand box with the sand core between the sand boxes with the sand mold.

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