A sand box construction for casting

Abstract

The application discloses a sand box structure for casting and relates to the technical field of casting equipment. The sand box structure comprises a plurality of straight strip plates, the straight strip plates are connected into frame units through connecting structures, the connecting structure comprises a right-angle assembly, a clamping assembly and a tooth lock assembly, the right-angle assembly comprises a right-angle groove, the right-angle groove can position two straight strip plates in a vertical state, the clamping assembly comprises a plurality of first meshing teeth parts fixed on the right-angle groove and a plurality of second meshing teeth parts fixed on the straight strip plates, the first meshing teeth parts can be engaged with the second meshing teeth parts, and the tooth lock assembly can lock the engagement between the first meshing teeth parts and the second meshing teeth parts. The right-angle assembly, the clamping assembly and the tooth lock assembly are arranged, so that the connection of the straight strip plates into the frame units can be completed through the clamping assembly and the tooth lock assembly, the influence of rust on the convenient adjustment of the sand box is reduced, and the adjustment and use of the sand box are facilitated.

Description

Technical Field

[0001] This invention relates to the field of casting equipment technology, specifically to a sandbox structure for casting. Background Technology

[0002] Casting is a method of pouring liquid metal into a casting cavity that conforms to the shape of the part, and then allowing it to cool and solidify to obtain the part or blank. The casting cavity is usually constructed in a sand box filled with sand.

[0003] Existing patents include those with publication number CN209520341U, titled "A Sandbox for Casting," which include "a base plate, wheels mounted on the base plate, a lower frame on the base plate, an upper frame on the lower frame, a connecting mechanism on both sides of the upper and lower frame, a vibration device on the lower frame, and limiting devices on the upper and lower frame. The connecting mechanism includes connecting frames on both sides of the upper and lower frame, bolts on the connecting frames, a lower connecting plate on the lower frame, and an upper connecting plate inside the connecting frame of the upper frame. The upper and lower connecting plates have threaded holes at their upper and lower ends that mate with the bolts, and the connecting frames have threaded holes that are compatible with the bolts."

[0004] However, existing sandboxes are composed of multiple stacked frame units, which are made up of right-angle plates and straight plates connected by bolts. The size of the frame's interior area can be changed by altering the connection distance between the right-angle plates and straight plates. However, this method has a drawback: since sandboxes are often in high-temperature environments, the higher the temperature, the more active the metal molecules become, making them more prone to oxidation and corrosion. The threads on the bolts are most susceptible to corrosion, which makes it difficult to disassemble and install the bolts, and consequently, it is inconvenient to adjust the size of the frame units. Therefore, corrosion has a significant impact on the ease of use and adjustment of the sandbox. Summary of the Invention

[0005] The purpose of this invention is to provide a sandbox structure for casting to overcome the shortcomings of the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A casting sandbox structure includes multiple straight strips, which are connected to each other as frame units by a connecting structure, wherein the connecting structure includes:

[0008] A right-angle assembly includes a right-angle groove that enables the perpendicular positioning of two straight plates.

[0009] The engagement assembly includes a plurality of first meshing teeth fixed on the right-angle groove and a plurality of second meshing teeth fixed on the straight plate, wherein the first meshing teeth are capable of engaging with the second meshing teeth;

[0010] A toothed locking assembly that can lock the first toothed portion into engagement with the second toothed portion.

[0011] Preferably, the right-angle component includes a bent block, the bent block has an L-shaped structure, the right-angle groove is located at the top of the bent block, and the end of the right-angle groove is flush with the end of the bent block.

[0012] Preferably, both the first and second meshing portions include vertical racks, and the length direction of the vertical racks is perpendicular to the bottom of the right-angle groove.

[0013] Preferably, the toothed locking assembly includes a channel cavity formed in the straight strip plate, a shaft is rotatably mounted inside the channel cavity, a trigger unit extending out of the channel cavity is provided on one side of the middle part of the shaft, and a locking unit that can extend out of the channel cavity is provided on the same side of both ends of the shaft.

[0014] Preferably, the triggering unit includes a side opening extending through the side of the straight plate, the side opening being connected to the channel cavity, and a handle fixed to the shaft passing through the side opening.

[0015] Preferably, the locking unit includes multiple insertion slots on the same side of the straight strip, each insertion slot having a pin insert movably inserted into it. One end of the pin insert is connected to the shaft via a linkage, and the pin insert can engage with the transverse cut on the side of the vertical rack.

[0016] Preferably, the linkage includes a fixed disc that is fixedly sleeved on the shaft. The fixed disc has an arc-shaped track opening on its disc body. One end of the pin insert has a slot that engages with the fixed disc. A shaft rod moves through the arc-shaped track opening. Both ends of the shaft rod are rotatably connected to the groove wall of the slot.

[0017] Preferably, the arc-shaped track opening is an arc-shaped line, with one end of the arc-shaped track opening close to the axis of the shaft rod and the other end of the arc-shaped track opening away from the axis of the shaft rod. When the shaft rod deflects, the pin insert will move in the corresponding length direction.

[0018] Preferably, the inner wall of the channel cavity is provided with an arc groove that is adapted to and engages with the fixed plate, thereby limiting the axial movement of the shaft within the channel cavity.

[0019] Preferably, a hanging ring is movably installed on the handle.

[0020] In the above technical solution, the present invention provides a casting sandbox structure, which, by setting a right-angle component, a snap-fit ​​component and a toothed locking component, allows the connection of the straight strips to form a frame unit to be completed by the snap-fit ​​component and the toothed locking component, without the need for bolts with fine threads for connection, reducing the impact of rust on the ease of use and adjustment of the sandbox, and facilitating the adjustment and use of the sandbox. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0022] Figure 1 This is a schematic diagram of the frame unit of a casting sandbox structure according to the present invention;

[0023] Figure 2 This is a partial structural diagram of a frame unit for a casting sandbox according to the present invention.

[0024] Figure 3 This is a schematic cross-sectional view of the channel cavity structure of a casting sandbox according to the present invention;

[0025] Figure 4 This is a schematic cross-sectional view of a bent block structure for a casting sandbox according to the present invention;

[0026] Figure 5 This is a schematic diagram of the triggering unit of a casting sandbox structure according to the present invention on a straight strip plate;

[0027] Figure 6 This is a schematic diagram of the linkage structure of a casting sandbox according to the present invention;

[0028] Figure 7 This is a schematic diagram of the structure of a semi-frame of a casting sandbox in a right-angled groove according to the present invention.

[0029] Figure 8 This is a schematic diagram of the bottom perforation of a casting sandbox structure of the present invention at the bottom of the bent block:

[0030] Figure 9 This is a partial cross-sectional schematic diagram of a stacked and interlocking frame unit for a casting sandbox structure according to the present invention:

[0031] Figure 10 This is a partial cross-sectional schematic diagram of a stacked frame unit in an unlocked state of a casting sandbox structure according to the present invention:

[0032] Figure 11This is an overall schematic diagram of the structure of a casting sandbox according to the present invention.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Straight strip; 2. Right-angle assembly; 2.1 Right-angle groove; 2.2 Bending block; 3. Engaging assembly; 3.1 First meshing tooth; 3.2 Second meshing tooth; 4. Tooth lock assembly; 4.1 Channel cavity; 4.11 Arc groove; 4.2 Shaft; 4.3 Trigger unit; 4.31 Side opening; 4.32 Handle; 4.321 Hanging ring; 4.4 Locking unit; 4.41 Insertion port; 4.42 Pin insert; 4.43 Linkage component; 4.431 Fixed plate; 4.432 Arc-shaped track opening; 4 4.433, Slot; 4.434, Shaft rod; 4.44, Horizontal cut; 5, Vertical rack; 5.1, Groove vertical rack teeth; 5.2, Plate vertical rack teeth; 6, Slider; 7, Groove sealing plate; 8, Insert pin; 9, Pin opening; 10, Through opening; 11, Bottom through opening; 12, Locking stop; 13, Half frame; 13.1, Main rod body; 13.2, First frame rod; 13.3, Second frame rod; 13.4, First arc-shaped pin; 13.5, Second arc-shaped pin; 14, Gear groove; 15, Gear rod; 16, Mounting plate; 17, Pin hole. Detailed Implementation

[0035] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0036] Please see Figure 1-11 The present invention provides a casting sandbox structure, comprising multiple straight strips 1, which are connected to each other by a connecting structure to form a frame unit. The connecting structure includes:

[0037] The right-angle component 2 includes a right-angle groove 2.1, which is capable of positioning the two straight strips 1 in a perpendicular state.

[0038] The engaging assembly 3 includes a plurality of first meshing teeth 3.1 fixed on the right-angle groove 2.1 and a plurality of second meshing teeth 3.2 fixed on the straight bar plate 1, wherein the first meshing teeth 3.1 are capable of engaging with the second meshing teeth 3.2;

[0039] The toothed locking assembly 4 is capable of locking the first toothed portion 3.1 into engagement with the second toothed portion 3.2.

[0040] Specifically, the multiple straight plates 1 are all flat, rigid plates, the right-angle component 2 can be a 90-degree right-angle plate, and the right-angle groove 2.1 can be a groove formed on the right-angle plate. The first tooth part 3.1 is a first rod fixed to the groove wall of the right-angle groove 2.1, and the second tooth part 3.2 can be a second rod fixed to the straight plate 1. Both the first rod and the second rod are parallel to the groove wall of the right-angle groove 2.1.

[0041] In actual use, when the straight plate 1 is inserted into the end of the right angle groove 2.1, the first rod and the second rod are in contact, with the first rod above the second rod. This limits the straight plate 1 in the direction perpendicular to the bottom of the right angle groove 2.1. The toothed locking assembly 4 can be selected as multiple first insertion holes on the side of the straight plate 1 and multiple second insertion holes on the side of the right angle plate. When the straight plate 1 is inserted into the end of the right angle groove 2.1, the pin is simultaneously inserted into the aligned first and second insertion holes, thus limiting the straight plate 1 in the direction horizontal to the bottom of the right angle groove 2.1. This eliminates the need for bolts with fine threads for connection. Disassembly can be performed by reversing the above operation, reducing the impact of corrosion on the ease of use and adjustment of the sand box, and facilitating the adjustment and use of the sand box.

[0042] In another embodiment of the present invention, the right-angle component 2 includes a bending block 2.2, which has an L-shaped structure and a rectangular cross-section. A right-angle groove 2.1 is located at the top of the bending block 2.2, and the groove has a rectangular cross-section. The end of the right-angle groove 2.1 is flush with the end of the bending block 2.2, meaning that both ends of the right-angle groove 2.1 are open, facilitating the engagement of the straight strip 1 with the right-angle groove 2.1.

[0043] In another embodiment of the present invention, both the first meshing part 3.1 and the second meshing part 3.2 include vertical racks 5, the length direction lines of the vertical racks 5 are perpendicular to the bottom of the right-angle groove 2.1, the vertical racks 4 on the first meshing part 3.1 are groove body vertical racks 5.1, and the groove body vertical racks 5.1 are evenly distributed on the side wall of the right-angle groove 2.1, the vertical racks 4 on the second meshing part 3.2 are plate body vertical racks 5.2, and the plate body vertical racks 5.2 are evenly distributed on the side wall of the straight plate 1, wherein the groove body vertical racks 5.1 on one side of the groove body of the right-angle groove 2.1 and the groove body vertical racks 5.1 on the other side of the groove body of the right-angle groove 2.1 are on the same plane;

[0044] In practical use, when the straight plate 1 is engaged in the right-angle groove 2.1, both sides of the straight plate 1 can contact the adjacent groove vertical teeth 5.1. At this time, the sides of each groove vertical teeth 5.1 are in contact with the adjacent plate vertical teeth 5.2. That is, the groove vertical teeth 5.1 and the plate vertical teeth 5.2 mesh with each other, thereby filling the space between the straight plate 1 and the groove wall of the right-angle groove 2.1, thus keeping the straight plate 1 perpendicular to the bottom of the right-angle groove 2.1. At the same time, the meshing between the groove vertical teeth 5.1 and the plate vertical teeth 5.2 limits the length of the straight plate 1 located in the right-angle groove 2.1.

[0045] In another embodiment of the present invention, the toothed locking assembly 4 includes a channel cavity 4.1 formed in the straight plate 1. A shaft 4.2 is rotatably mounted inside the channel cavity 4.1. A trigger unit 4.3 extending out of the channel cavity 4.1 is provided on one side of the middle part of the shaft 4.2. Locking units 4.4 that can extend out of the channel cavity 4.1 are provided on the same side of both ends of the shaft 4.2. The channel cavity 4.1 is a cylindrical cavity. Both ends of the channel cavity 4.1 are located at the ends of the straight plate 1. The axis of the channel cavity 4.1 is parallel to the length direction of the straight plate 1. In actual use, the shaft 4.2 can deflect within a range of 30 to 70 degrees. Preferably, the deflection range of the shaft 4.2 is 45 degrees. When the shaft 4.2 reaches the positive limit deflection position, the locking unit 4.4 is in a locked state. When the shaft 4.2 reaches the reverse limit deflection position, the locking unit 4.4 is in an unlocked state.

[0046] In another embodiment of the present invention, the triggering unit 4.3 includes a side opening 4.31 extending through the side of the straight plate 1. The side opening 4.31 is a vertical elongated opening and is connected to the channel cavity 4.1. A handle 4.32 fixed to the shaft 4.2 is movably inserted through the side opening 4.31. The axis of the handle 4.32 is perpendicular to the axis of the shaft 4.2. The handle 4.32 extends through the plate body of the straight plate 1. The end of the handle 4.32 inside the frame unit formed by the straight plate 1 is the inner end, and the end of the handle 4.32 outside the frame unit formed by the straight plate 1 is the outer end.

[0047] In actual use, when the inner end of the handle 4.32 descends and the outer end rises, the shaft 4.2 deflects in the positive direction. When the outer end of the handle 4.32 contacts the top of the side opening 4.31, the shaft 4.2 reaches the positive limit deflection position. When the outer end of the handle 4.32 descends and the inner end rises, the shaft 4.2 deflects in the reverse direction. When the inner end of the handle 4.32 contacts the top of the side opening 4.31, the shaft 4.2 reaches the reverse limit deflection position.

[0048] In another embodiment of the present invention, the locking unit 4.4 includes a plurality of insertion slots 4.41 formed on the same side of the straight plate 1. Each insertion slot 4.41 is movably inserted with a pin 4.42. The cross-section of each pin 4.42 is rectangular, and the length direction of the pin 4.42 is perpendicular to the surface of the straight plate 1. One end of the pin 4.42 is connected to the shaft 4.2 via a connecting member 4.43. The pin 4.42 can engage with the pins formed on the vertical teeth. The transverse cut 4.44 on the side of the rack 5 is engaged with the insertion port 4.41. The transverse cut 4.44 is located on the side where the vertical rack 5 contacts the straight plate 1. When the pin insert 4.42 is engaged with the transverse cut 4.44, the locking unit 4.4 is in a locked state. When the pin insert 4.42 is completely separated from the transverse cut 4.44, the end of the pin insert 4.42 is flush with the straight plate 1, and the locking unit 4.4 is in an unlocked state.

[0049] In another embodiment of the present invention, the linkage 4.43 includes a fixed disc 4.431 fixedly sleeved on the shaft 4.2. There are multiple fixed discs 4.431, each corresponding to a through-hole 4.41. The disc surface of the fixed disc 4.431 is perpendicular to the axis of the shaft 4.2. An arc-shaped track opening 4.432 is provided on the disc body of the fixed disc 4.431. The arc-shaped track opening 4.432 is a through-hole. One end of the pin insert 4.42 has a slot 4.433 that engages with the fixed disc 4.431. The shaft rod 4.2 moves through the arc-shaped track opening 4.432. 4.434, the axis of the shaft rod 4.434 is perpendicular to the surface of the fixed plate 4.431. Both ends of the shaft rod 4.434 are rotatably connected to the groove wall of the slot 4.433. The arc-shaped track opening 4.432 is an arc. One end of the arc-shaped track opening 4.432 is close to the axis of the shaft rod 4.434, which is the proximal end of the arc-shaped track opening 4.432. The other end of the arc-shaped track opening 4.432 is far away from the axis of the shaft rod 4.434, which is the eccentric end of the arc-shaped track opening 4.432. When the shaft rod 4.434 deflects, the pin insert 4.42 will move accordingly in the length direction.

[0050] In actual use, when shaft 4.2 deflects in the positive direction, shaft rod 4.434 moves towards the center end, and pin insert 4.42 extends out of insertion port 4.41 towards transverse cut 4.44, engaging with transverse cut 4.44. When shaft 4.2 deflects in the reverse direction, shaft rod 4.434 moves towards the proximal end, and pin insert 4.42 retracts into insertion port 4.41 away from transverse cut 4.44, separating from transverse cut 4.44.

[0051] In another embodiment of the present invention, an arc groove 4.11 adapted to and engaging with the fixed disk 4.431 is provided on the inner wall of the channel cavity 4.1, thereby limiting the axial movement of the shaft 4.2 within the channel cavity 4.1. The arc groove 4.11 coincides with the insertion port 4.41, and a slider 6 fixed to the edge of the fixed disk 4.431 is slidably engaged within the arc groove 4.11, thereby limiting the maximum rotation angle of the fixed disk 4.431. When the slider contacts the end of the arc groove 4.11, the fixed disk 4.431 reaches the position of maximum rotation angle in that direction.

[0052] In another embodiment of the present invention, a hanging ring 4.321 is movably installed on the handle 4.32. Specifically, hanging rings 4.321 are installed at both ends of the handle 4.32, thereby facilitating the hanging operation of the hanging equipment. In actual use, when the straight bar 1 is assembled into a frame unit through the connecting structure, and it is necessary to hang the straight bar 1 individually, the hook is engaged with the hanging ring 4.321 on the inner end of the handle 4.32, keeping the inner end of the handle 4.32 in contact with the top of the side opening 4.31, thereby causing the pin insert 4.42 to retract into the insertion port 4.41, locking the single bar. Unit 4.4 is in the unlocked state, which facilitates the engagement of the straight strip 1 in the right-angle slot 2.1. When it is necessary to stack the complete frame units to form a box, the hook is engaged with the hanging ring 4.321 on the outer end of the handle 4.32, so that the outer end of the handle 4.32 is in contact with the top of the side opening 4.31, keeping the locking unit 4.4 in the locked state, which helps to prevent the frame units from becoming loose. Similarly, when it is necessary to disassemble the frame unit, the hook is engaged with the hanging ring 4.321 on the inner end of the handle 4.32, and the locking unit 4.4 is in the unlocked state, which will not be elaborated further.

[0053] In another embodiment of the present invention, a groove sealing plate 7 is fixed at the bending position of the right-angle groove 2.1. The top of the groove sealing plate 7 is flush with the top of the bent block 2.2. Two inserts 8 are fixed at the top of the groove sealing plate 7. One insert 8 is located on the groove intersection direction line of the right-angle groove 2.1, and the other insert 8 is located on the groove intersection direction line of the right-angle groove 2.1. Each insert 8 has a pin hole 9 on its side. The groove sealing plate 7 has a through opening 10. The bottom bend of the right-angle groove 2.1 has a bottom through opening 11. The center of the bottom through opening 11 is aligned with the insert hole 9. The extended lines of the axis of column 8 coincide. The diameter of column 8 is smaller than the diameter of bottom through-hole 11, allowing column 8 to pass smoothly through bottom through-hole 11. Bottom of bottom through-hole 11 has a locking opening 12, which is a blind hole. A semi-frame 13 is provided between the bottom of right-angle groove 2.1 and groove sealing plate 7. Semi-frame 13 includes a main rod 13.1. One end of semi-frame 13 is vertically fixed with a first frame rod 13.2, and the other end of semi-frame 13 is vertically fixed with a second frame rod 13.3 parallel to the first frame rod 13.1. 2. The first frame rod 13.2 and the second frame rod 13.3 are located on the same side of the main rod 13.1. A first arc-shaped pin 13.4 is fixed to the side of the first frame rod 13.2. A pin hole 17 is opened on the side of the rod body at the end of the first arc-shaped pin 13.4. A second arc-shaped pin 13.5 is fixed to the side of the second frame rod 13.3. The first arc-shaped pin 13.4 can move through the opening 10. The part of the shaft 4.2 that extends out of the channel cavity 4.1 is the extension of the shaft 4.2. Multiple toothed grooves 14 are opened on the circumferential surface of the extension of the shaft 4.2. The extension of the shaft 4.2 constitutes... The toothed column structure has a toothed column rod 15 vertically fixed to one side of the main rod 13.1. The axis of the toothed column rod 15 is parallel to the axis of the shaft 4.2. The toothed column rod 15 can mesh with the toothed groove 14. The column of the toothed column rod 15 is movably connected to the mounting plate 16. The end of the mounting plate 16 is fixed to the groove wall of the right angle groove 2.1, so that the toothed column rod 15 can rotate stably in the right angle groove 2.1. The centers of the first arc-shaped pin 13.4 and the second arc-shaped pin 13.5 are both on the extension line of the axis of the toothed column rod 15.

[0054] In the actual assembly process of the box, after the first frame unit is completed, the second frame unit is built on the basis of the first frame unit. The individual bent block 2.2 is aligned with the bent block 2.2 on the already assembled frame, forming the first frame unit. Then, the insert post 8 on the bent block 2.2 on the already assembled frame is inserted into the bottom through-hole 11 of the individual bent block 2.2, thus positioning the individual bent block 2.2 on the already assembled frame. The insert post 8 on the bent block 2.2 on the already assembled frame forms an insertion post in the right-angle groove 2.1 of the individual bent block 2.2. At this time, the first frame rod 13.2 and the second frame rod 13.3 are respectively located at the insertion post. On both sides, the insertion post is located in the half-frame 13. When the straight plate 1 engages with the right-angle groove 2.1 on the individual bent block 2.2, the toothed rod 15 can mesh with the toothed groove 14. When the shaft 4.2 deflects in the positive direction, the meshing transmission between the toothed rod 15 and the toothed groove 14 causes the toothed rod 15 to drive the half-frame 13 to deflect in the first direction. When the shaft 4.2 reaches the positive limit deflection position, one end of the first arc-shaped pin 13.4 moves through the through opening 10, and one end of the second arc-shaped pin 13.5 engages with the pin hole 9 of the insertion post, that is, it engages with the pin hole 9 of the insertion post 8 on the bent block 2.2 of the assembled frame, thus preventing the insertion post from exiting the individual bent block 2.2. Separation occurs within the bottom opening 11, locking the individual bent block 2.2 to the bent block 2.2 on the assembled frame. This facilitates the connection between the various frames to form a complete box frame. After the second frame unit is assembled, when the third individual bent block 2.2 is aligned and in contact with the bent block 2.2 on the assembled second-layer frame, one end of the first arc-shaped pin 13.4, which moves through the through opening 10 in the second frame unit, engages with the locking slot 12 of the third individual bent block 2.2. This limits the first arc-shaped pin 13.4 in the second frame unit from disengaging from the through opening 10, preventing it from disengaging. The opening 10 is disengaged, which helps to keep the locking unit 4.4 in a locked state and also ensures that the second-layer frame unit is locked to the bent block 2.2 on the first-layer frame unit that has been assembled, for further reinforcement. Repeat the above operation. When the frame units are stacked to the required number of layers, the pin rod passes through the pin hole 17 at the top of the box, thereby preventing the first arc-shaped pin rod 13.4 from disengaging from the opening 10 through which it passes. The pin rod can be replaced by other metal parts such as iron wire that can play a locking role, making the entire assembly and adjustment more convenient. It can lock the frame unit itself at one time, and also lock the connection between each frame unit. The operation is simple and stable, saving time and improving efficiency.

[0055] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A sandbox structure for casting, comprising a plurality of straight strips (1), characterized in that: Each of the straight strips (1) is connected to form a frame unit by a connecting structure, the connecting structure including: The right-angle component (2) includes a right-angle groove (2.1) which is capable of positioning the two straight strips (1) in a vertical state; The engaging assembly (3) includes a plurality of first meshing teeth (3.1) fixed on the right-angle groove (2.1) and a plurality of second meshing teeth (3.2) fixed on the straight bar plate (1), wherein the first meshing teeth (3.1) are capable of engaging with the second meshing teeth (3.2); The toothed locking assembly (4) is capable of locking the first toothed part (3.1) to engage with the second toothed part (3.2); The right-angle component (2) includes a bent block (2.2), which has an L-shaped structure. The right-angle groove (2.1) is located at the top of the bent block (2.2), and the end of the right-angle groove (2.1) is flush with the end of the bent block (2.2). Both the first toothed part (3.1) and the second toothed part (3.2) include vertical racks (5), and the length direction line of the vertical racks (5) is perpendicular to the bottom of the right-angle groove (2.1). The toothed locking assembly (4) includes a channel cavity (4.1) opened in the straight bar plate (1). A shaft (4.2) is rotatably installed inside the channel cavity (4.1). A trigger unit (4.3) extending out of the channel cavity (4.1) is provided on one side of the middle part of the shaft (4.2). A locking unit (4.4) that can extend out of the channel cavity (4.1) is provided on the same side of both ends of the shaft (4.2). The trigger unit (4.3) includes a side opening (4.31) penetrating through the side of the straight bar plate (1). The side opening (4.31) is connected to the channel cavity (4.1). A handle (4.32) fixed to the shaft (4.2) is movably inserted through the side opening (4.31). The locking unit (4.4) includes multiple insertion ports (4.41) on the same side of the straight strip plate (1). Each insertion port (4.41) is movably inserted with a pin insert (4.42). One end of the pin insert (4.42) is connected to the shaft (4.2) via a connecting member (4.43). The pin insert (4.42) can engage with the transverse cut (4.44) on the side of the vertical rack (5).

2. The casting sandbox structure according to claim 1, characterized in that, The linkage (4.43) includes a fixed disc (4.431) fixedly sleeved on the shaft (4.2). The fixed disc (4.431) has an arc-shaped track opening (4.432) on its disc body. One end of the pin insert (4.42) has a slot (4.433) that engages with the fixed disc (4.431). A shaft rod (4.434) movably passes through the arc-shaped track opening (4.432). Both ends of the shaft rod (4.434) are rotatably connected to the groove wall of the slot (4.433).

3. The casting sandbox structure according to claim 2, characterized in that, The arc-shaped track opening (4.432) is an arc-shaped line. One end of the arc-shaped track opening (4.432) is close to the axis of the shaft rod (4.434), and the other end of the arc-shaped track opening (4.432) is far away from the axis of the shaft rod (4.434). When the shaft rod (4.434) deflects, the pin insert (4.42) will move in the corresponding length direction.

4. The casting sandbox structure according to claim 3, characterized in that, The inner wall of the channel cavity (4.1) is provided with an arc groove (4.11) that is adapted to and engages with the fixed plate (4.431), thereby limiting the shaft (4.2) axially upward within the channel cavity (4.1).

5. The sandbox structure for casting according to claim 4, characterized in that, A hanging ring (4.321) is movably installed on the handle (4.32).

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