Combined sandbox and combination method thereof

Abstract

The invention discloses a combined sandbox and a combination method thereof.The combined sandbox comprises a first lower sandbox body and a second lower sandbox body, a first upper sandbox body is arranged at the upper end of the first lower sandbox body, and a second upper sandbox body is arranged at the upper end of the second lower sandbox body; limiting grooves are formed in the sides, close to the second lower-position sand box, of the first lower-position sand box and the first upper-position sand box, the limiting grooves are of open structures, first clamping strips are fixedly arranged outside the sides, close to the first lower-position sand box, of the second lower-position sand box and the second upper-position sand box, and the first clamping strips extend into the limiting grooves; and the first clamping strips are clamped and fixed to the limiting grooves, the second lower sandbox and the second upper sandbox are separated from the first lower sandbox and the first upper sandbox correspondingly, and then the first lower sandbox and the first upper sandbox are sealed through the sliding plates correspondingly, and by means of the structure, the problems that sandbox combination is not flexible enough, and sandbox fixing is not firm enough are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of sandbox combination, and in particular to a combined sandbox and a combination method thereof. Background Art

[0002] The modular sandbox is a special design and functional equipment in the foundry industry. It is a sandbox system that can be assembled and disassembled as needed. It usually consists of multiple modules or components, such as the sandbox body, frame, vibrator, cooling system, etc. These components can be selected and configured according to the requirements of the specific casting task. The modular sandbox adopts a modular design, and the modules are connected through standardized interfaces or connectors, so that the sandbox can be flexibly assembled into different sizes and shapes to meet the casting needs of different castings.

[0003] For example, the Chinese patent "Combined Casting Sand Box Structure" with announcement number CN221362607U includes a lower sand box, the top surface of the lower sand box contacts the bottom surface of the upper sand box, the bottom surface of the upper sand box is provided with a sealing groove, a sealing ring is clamped in the sealing groove, the bottom surface of the sealing ring is fixedly connected to the top surface of the lower sand box, the bottom surface of the lower sand box is symmetrically fixed to one end of the support rod, the other end of the support rod is fixedly connected to the top surface of the fixed base, the inner bottom surface of the lower sand box is provided with an adjustment hole, and a pushing component is clamped in the adjustment hole; one side of the outer wall of the upper sand box is fixedly connected to a mounting block, the mounting block is provided with a mounting hole, a rotating bearing is fixed in the mounting hole, one end of a connecting rod is fixed in the rotating bearing, and one end of the connecting rod is fixedly connected to the bottom surface of the rotating block.

[0004] Although the above-mentioned prior art can realize the combination of sandboxes, in actual use, on the one hand, the sandbox combination is not flexible enough. Usually, the sandbox is composed of an upper sandbox and a lower sandbox, which makes it difficult for the combined sandbox to adapt to workpieces that are too long, thereby reducing the adaptability of the sandbox to different workpieces. On the other hand, the sandbox is not fixed firmly enough. Usually, the sandbox is fixed with bolts and nuts when combined, which causes the vibration generated when the sandbox is used to loosen the nuts, thereby reducing the fixing effect of the sandbox. Therefore, it does not meet the existing needs. In this regard, we propose a combined sandbox and a combination method thereof. Summary of the invention

[0005] The object of the present invention is to provide a combined sandbox and a combination method thereof, so as to solve the problems that the sandbox combination proposed in the above background technology is not flexible enough and the sandbox is not fixed firmly enough.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a combined sandbox, comprising a first lower sandbox and a second lower sandbox, a first upper sandbox being arranged at the upper end of the first lower sandbox, a second upper sandbox being arranged at the upper end of the second lower sandbox, a limiting groove being arranged inside the first lower sandbox and the first upper sandbox on a side close to the second lower sandbox, the limiting groove being an open structure, a first clamping strip being fixedly arranged outside the second lower sandbox and the second upper sandbox on a side close to the first lower sandbox, the first clamping strip extending to the inside of the limiting groove, and the first clamping strip being clamped and fixed to the limiting groove, after the second lower sandbox and the second upper sandbox are respectively detached from the first lower sandbox and the first upper sandbox, the first lower sandbox and the first upper sandbox are respectively closed by a slide plate.

[0007] Preferably, the front and rear ends of the second lower sandbox and the second upper sandbox are each provided with two first fixed cavities, the first fixed cavities are a through-type structure, the front and rear ends of the first lower sandbox and the first upper sandbox are each provided with two second fixed cavities, the second fixed cavities are a through-type structure, and the positions of the first fixed cavities correspond to those of the second fixed cavities.

[0008] Preferably, a first screw is provided inside the first fixed cavity, one end of the first screw passes through the second fixed cavity and extends to the outside of the first upper sand box, and the other end of the first screw extends to the outside of the second upper sand box, and a first nut is fixedly provided on one side of the first screw located outside the second upper sand box.

[0009] Preferably, the front and rear ends of one side of the skateboard are fixedly provided with a second clip strip, the second clip strip extends to the inside of the limiting groove, and the second clip strip is clipped and fixed to the limiting groove, and the front and rear ends inside the skateboard are provided with two third fixed cavities, the third fixed cavity is a through-type structure, and the position of the third fixed cavity corresponds to that of the second fixed cavity.

[0010] Preferably, a third screw is provided inside the third fixed cavity, one end of the third screw passes through the second fixed cavity and extends to the outside of the first upper sand box, and the other end of the third screw extends to the outside of the skateboard, and a second nut is fixedly provided on one side of the third screw located outside the skateboard, and a first rubber pad is fixedly provided on the side of the first nut and the second nut close to the first upper sand box.

[0011] Preferably, a first sealing strip is fixedly provided between the first lower sandbox and the second lower sandbox, and between the first upper sandbox and the second upper sandbox, and a second sealing strip is fixedly provided at the connection between the slide plate and the first lower sandbox and the first upper sandbox, respectively.

[0012] Preferably, four clamping cavities are provided on one side of the interior of the first lower sand box and the first upper sand box, the clamping cavities are of open structure, and the clamping cavities are communicated with the second fixed cavity, and clamping seats are fixedly provided on the side walls of the front and rear ends of the interior of the clamping cavities, and an installation tube is provided inside the clamping cavity between the clamping seats, and T-shaped clamping blocks are fixedly provided on the front and rear ends of the exterior of the installation tube, and the T-shaped clamping blocks are clamped and fixed with the clamping seats, one end of the installation tube extends to the outside of the clamping cavity, and a first nut is fixedly provided on one side of the installation tube located outside the clamping cavity.

[0013] Preferably, the first nut is respectively sleeved on the outside of the first screw and the third screw, and the first nut is respectively connected to the first screw and the third screw through threads, and a second rubber pad is fixedly provided on one side of the first nut close to the first upper sand box.

[0014] Preferably, the front and rear ends of the first lower sandbox and the second lower sandbox are fixedly provided with a first fixing seat, the upper end of the first fixing seat is fixedly provided with a second screw, the front and rear ends of the first upper sandbox and the second upper sandbox are fixedly provided with a second fixing seat, the second fixing seat corresponds to the position of the first fixing seat, a positioning hole is provided inside the second fixing seat, the positioning hole is a through-type structure, the second screw extends to the top of the second fixing seat through the positioning hole, a second nut is provided outside the second screw above the second fixing seat, and the second nut is connected to the second screw by a thread.

[0015] A method for combining a combined sandbox comprises the following steps:

[0016] Step 1: When the first lower sandbox and the first upper sandbox are used separately, first align the second clamping strip on the slide plate with the opening of the limiting groove and push it into the limiting groove, and preliminarily close the first lower sandbox and the first upper sandbox by the slide plate. At this time, align the third screw rod with the opening on one side of the third fixed cavity and push it into the third fixed cavity until one end of the third screw rod extends out of the second fixed cavity, and at the same time, the first rubber pad on the second nut contacts and squeezes the slide plate;

[0017] Step 2: When the third screw needs to be fixed, first align the opening of the installation barrel with the third screw and rotate the first nut, so that the first nut moves outside the third screw together with the installation barrel through the thread until the installation barrel is inserted into the inside of the clamping cavity. At this time, the operator rotates the entire structure of the third screw until the T-shaped clamping block on the installation barrel slides into the clamping seat, thereby clamping and fixing the first nut;

[0018] Step 3: When the second lower sandbox and the second upper sandbox are used in combination, first align the first clamping strips on the second lower sandbox and the second upper sandbox with the opening of the limiting groove and push them into the limiting groove until the second lower sandbox moves to a suitable position. At this time, align the first screw rod with the opening on one side of the first fixed cavity and push it into the first fixed cavity until one end of the first screw rod extends out of the second fixed cavity, and at the same time, the first rubber pad on the first nut contacts and squeezes the second lower sandbox;

[0019] Step 4: When the first screw needs to be fixed, first align the opening of the mounting tube with the first screw and rotate the first nut, so that the first nut moves outside the third screw together with the mounting tube through the thread until the mounting tube is inserted into the inside of the clamping cavity. At this time, the operator rotates the overall structure of the first screw until the T-shaped clamping block on the mounting tube slides into the clamping seat, thereby clamping and fixing the first nut.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention can combine sandboxes through the first clamping strip and the first screw. When the second lower sandbox and the second upper sandbox are used in combination, first align the first clamping strips on the second lower sandbox and the second upper sandbox with the opening of the limiting groove and push them into the limiting groove until the second lower sandbox moves to a suitable position. At this time, align the first screw with the opening on one side of the first fixed cavity and push it into the first fixed cavity until one end of the first screw extends out of the second fixed cavity. At the same time, the first rubber pad on the first nut contacts and squeezes the second lower sandbox, so that the sandbox can adapt to workpieces of different sizes.

[0022] 2. The present invention can make the first nut more firmly fixed by using the T-shaped clamping block and the clamping seat. When the third screw or the first screw needs to be fixed, first align the opening of the installation tube with the third screw or the first screw and rotate the first nut, so that the first nut moves outside the third screw or the first screw together with the installation tube through the thread until the installation tube is inserted into the inside of the clamping cavity. At this time, the operator rotates the overall structure of the third screw or the first screw until the T-shaped clamping block on the installation tube slides into the clamping seat, thereby clamping and fixing the first nut, thereby avoiding the situation where the first nut becomes loose due to the vibration generated when using the sandbox.

[0023] 3. The present invention uses a slide plate and a second clip strip to enable the first lower sandbox and the first upper sandbox to be used separately. When the first lower sandbox and the first upper sandbox are used separately, first align the second clip strip on the slide plate with the opening of the limiting groove and push it into the limiting groove, and preliminarily close the first lower sandbox and the first upper sandbox through the slide plate. At this time, align the third screw with the opening on one side of the third fixed cavity and push it into the third fixed cavity until one end of the third screw extends out of the second fixed cavity. At the same time, the first rubber pad on the second nut contacts and squeezes the slide plate, thereby improving the flexibility of the sandbox. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional diagram of the overall combined structure of the present invention;

[0025] Figure 2 It is a top view of the overall combined structure of the present invention;

[0026] Figure 3 It is a side view of the first sandbox combination structure of the present invention;

[0027] Figure 4 It is a side view of the second sandbox combination structure of the present invention;

[0028] Figure 5 A top view of the first independent structure of the sandbox of the present invention;

[0029] Figure 6 For the present invention Figure 2 A partial enlarged view of area A.

[0030] In the figure: 1. first lower sandbox; 2. second lower sandbox; 3. first upper sandbox; 4. second upper sandbox; 5. first clamping strip; 6. limiting groove; 7. nut; 8. first screw; 9. first nut; 10. first fixing seat; 11. second screw; 12. second fixing seat; 13. second nut; 14. positioning hole; 15. slide plate; 16. first fixing cavity; 17. second fixing cavity; 18. first sealing strip; 19. first rubber pad; 20. second clamping strip; 21. second sealing strip; 22. third fixing cavity; 23. installation tube; 24. clamping cavity; 25. T-shaped clamping block; 26. clamping seat; 27. second rubber pad; 28. third screw; 29. ​​second nut. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] See also Figure 1-6, an embodiment of the present invention is: a combined sandbox, including a first lower sandbox 1 and a second lower sandbox 2, a first upper sandbox 3 is arranged at the upper end of the first lower sandbox 1, and a second upper sandbox 4 is arranged at the upper end of the second lower sandbox 2, and the first lower sandbox 1 and the first upper sandbox 3 are both provided with limiting grooves 6 inside the side close to the second lower sandbox 2, and the limiting grooves 6 are open structures, and the second lower sandbox 2 and the second upper sandbox 4 are both fixedly provided with first clamping strips 5 outside the side close to the first lower sandbox 1, and the first clamping strips 5 extend to the inside of the limiting grooves 6, and the first clamping strips 5 are clamped and fixed with the limiting grooves 6, and after the second lower sandbox 2 and the second upper sandbox 4 are respectively detached from the first lower sandbox 1 and the first upper sandbox 3, the first lower sandbox 1 and the first upper sandbox 3 are respectively closed by the slide plate 15.

[0033] During use, when the second lower sandbox 2 and the second upper sandbox 4 are used in combination, first align the first clamping strip 5 on the second lower sandbox 2 and the second upper sandbox 4 with the opening of the limiting groove 6 and push it into the limiting groove 6 until the second lower sandbox 2 moves to a suitable position. At this time, align the first screw 8 with the opening on one side of the first fixed cavity 16 and push it into the first fixed cavity 16 until one end of the first screw 8 extends out of the second fixed cavity 17, and at the same time, the first rubber pad 19 on the first nut 7 contacts and squeezes the second lower sandbox 2.

[0034] See also Figure 3 and Figure 4 Two first fixed cavities 16 are provided at the front and rear ends of the second lower sand box 2 and the second upper sand box 4, and the first fixed cavity 16 is a through-type structure. Two second fixed cavities 17 are provided at the front and rear ends of the first lower sand box 1 and the first upper sand box 3, and the second fixed cavity 17 is a through-type structure. The positions of the first fixed cavity 16 and the second fixed cavity 17 correspond to each other, which facilitates the installation of the first screw 8 through the first fixed cavity 16 and the second fixed cavity 17.

[0035] See also Figure 2 and Figure 4 A first screw rod 8 is arranged inside the first fixed cavity 16, one end of the first screw rod 8 passes through the second fixed cavity 17 and extends to the outside of the first upper sandbox 3, and the other end of the first screw rod 8 extends to the outside of the second upper sandbox 4. A first nut 7 is fixedly arranged on one side of the first screw rod 8 outside the second upper sandbox 4, so as to facilitate the connection of the assembled sandboxes through the first screw rod 8.

[0036] See also Figure 5A second clamping strip 20 is fixedly provided at the front and rear ends of one side of the skateboard 15. The second clamping strip 20 extends to the inside of the limiting groove 6, and the second clamping strip 20 is clamped and fixed with the limiting groove 6. Two third fixing cavities 22 are provided at the front and rear ends inside the skateboard 15. The third fixing cavity 22 is a through-type structure, and the position of the third fixing cavity 22 corresponds to the second fixing cavity 17, so that the skateboard 15 can be fixed through the third fixing cavity 22 and the second fixing cavity 17.

[0037] See also Figure 5 A third screw 28 is arranged inside the third fixed cavity 22, one end of the third screw 28 passes through the second fixed cavity 17 and extends to the outside of the first upper sand box 3, and the other end of the third screw 28 extends to the outside of the skateboard 15, and a second nut 29 is fixedly arranged on one side of the third screw 28 located outside the skateboard 15, and a first rubber pad 19 is fixedly arranged on the side of the first nut 7 and the second nut 29 close to the first upper sand box 3, so as to improve the stability of the third screw 28 through the first rubber pad 19.

[0038] See also Figure 2 and Figure 5 A first sealing strip 18 is fixedly provided between the connection parts of the first lower sand box 1 and the second lower sand box 2, and the first upper sand box 3 and the second upper sand box 4, and a second sealing strip 21 is fixedly provided at the connection parts of the slide plate 15 and the first lower sand box 1 and the first upper sand box 3, respectively, so as to improve the sealing performance of the sand box connection parts through the first sealing strip 18.

[0039] See also Figure 2 and Figure 6 Four clamping cavities 24 are provided on one side inside the first lower sandbox 1 and the first upper sandbox 3. The clamping cavity 24 is an open structure, and the clamping cavity 24 is connected with the second fixed cavity 17. The front and rear ends inside the clamping cavity 24 are fixedly provided with clamping seats 26 on the side walls. The clamping cavity 24 is located between the clamping seats 26 and an installation cylinder 23 is provided inside. The front and rear ends outside the installation cylinder 23 are fixedly provided with T-shaped clamping blocks 25, and the T-shaped clamping blocks 25 are clamped and fixed with the clamping seats 26. One end of the installation cylinder 23 extends to the outside of the clamping cavity 24, and the first nut 9 is fixedly provided on one side of the installation cylinder 23 located outside the clamping cavity 24, so as to make the connection of the first nut 9 more stable through the T-shaped clamping block 25 and the clamping seat 26.

[0040] See also Figure 2 and Figure 6 The first nut 9 is respectively sleeved on the outside of the first screw 8 and the third screw 28, and the first nut 9 is respectively connected to the first screw 8 and the third screw 28 by threads. A second rubber pad 27 is fixedly provided on one side of the first nut 9 close to the first upper sand box 3, so as to improve the stability of the first nut 9 through the second rubber pad 27.

[0041] See also Figure 1 and Figure 2 A first fixing seat 10 is fixedly provided on the front and rear ends of the first lower sandbox 1 and the second lower sandbox 2, and a second screw 11 is fixedly provided on the upper end of the first fixing seat 10. A second fixing seat 12 is fixedly provided on the front and rear ends of the first upper sandbox 3 and the second upper sandbox 4. The second fixing seat 12 corresponds to the position of the first fixing seat 10. A positioning hole 14 is provided inside the second fixing seat 12. The positioning hole 14 is a through-type structure. The second screw 11 extends to the top of the second fixing seat 12 through the positioning hole 14. A second nut 13 is provided on the outside of the second screw 11 located above the second fixing seat 12. The second nut 13 is threadedly connected to the second screw 11, so as to facilitate the positioning of the sandbox through the second screw 11 and the positioning hole 14.

[0042] A method for combining a combined sandbox comprises the following steps:

[0043] Step 1: When the first lower sandbox 1 and the first upper sandbox 3 are used separately, first align the second clamping strip 20 on the slide plate 15 with the opening of the limiting groove 6 and push it into the limiting groove 6, and preliminarily close the first lower sandbox 1 and the first upper sandbox 3 by the slide plate 15. At this time, align the third screw 28 with the opening on one side of the third fixed cavity 22 and push it into the third fixed cavity 22 until one end of the third screw 28 extends out of the second fixed cavity 17, and at the same time, the first rubber pad 19 on the second nut 29 contacts and squeezes the slide plate 15;

[0044] Step 2: When the third screw 28 needs to be fixed, first align the opening of the installation barrel 23 with the third screw 28 and rotate the first nut 9, so that the first nut 9 moves outside the third screw 28 together with the installation barrel 23 through the thread until the installation barrel 23 is inserted into the inside of the clamping cavity 24. At this time, the operator rotates the entire structure of the third screw 28 until the T-shaped clamping block 25 on the installation barrel 23 slides into the clamping seat 26, so as to clamp and fix the first nut 9;

[0045] Step 3: When the second lower sandbox 2 and the second upper sandbox 4 are used in combination, first align the first clamping strip 5 on the second lower sandbox 2 and the second upper sandbox 4 with the opening of the limiting groove 6 and push it into the limiting groove 6 until the second lower sandbox 2 moves to a suitable position. At this time, align the first screw 8 with the opening on one side of the first fixed cavity 16 and push it into the first fixed cavity 16 until one end of the first screw 8 extends out of the second fixed cavity 17, and at the same time, the first rubber pad 19 on the first nut 7 contacts and squeezes the second lower sandbox 2;

[0046] Step 4: When it is necessary to fix the first screw 8, first align the opening of the mounting tube 23 with the first screw 8 and rotate the first nut 9, so that the first nut 9 moves outside the third screw 28 together with the mounting tube 23 through the thread until the mounting tube 23 is inserted into the inside of the clamping cavity 24. At this time, the operator rotates the overall structure of the first screw 8 until the T-shaped clamping block 25 on the mounting tube 23 slides into the clamping seat 26, thereby clamping and fixing the first nut 9.

[0047] Working principle: When the third screw 28 or the first screw 8 needs to be fixed, first align the opening of the installation barrel 23 with the third screw 28 or the first screw 8 and rotate the first nut 9, so that the first nut 9 moves outside the third screw 28 or the first screw 8 together with the installation barrel 23 through the thread until the installation barrel 23 is inserted into the inside of the clamping cavity 24. At this time, the operator rotates the overall structure of the third screw 28 or the first screw 8 until the T-shaped clamping block 25 on the installation barrel 23 slides into the clamping seat 26, thereby clamping the first nut 9. Fixed, when the first lower sandbox 1 and the first upper sandbox 3 are used separately, first align the second clamping strip 20 on the slide plate 15 with the opening of the limiting groove 6 and push it into the limiting groove 6, and preliminarily close the first lower sandbox 1 and the first upper sandbox 3 through the slide plate 15. At this time, align the third screw 28 with the opening on one side of the third fixed cavity 22 and push it into the third fixed cavity 22 until one end of the third screw 28 extends from the second fixed cavity 17, and at the same time, the first rubber pad 19 on the second nut 29 contacts and squeezes the slide plate 15.

[0048] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A combined sandbox, comprising a first lower sandbox (1) and a second lower sandbox (2), characterized in that: A first upper sandbox (3) is arranged at the upper end of the first lower sandbox (1), and a second upper sandbox (4) is arranged at the upper end of the second lower sandbox (2). A limiting groove (6) is arranged inside the first lower sandbox (1) and the first upper sandbox (3) on the side close to the second lower sandbox (2). The limiting groove (6) is an open structure. A first clamping strip (5) is fixedly arranged outside the second lower sandbox (2) and the second upper sandbox (4) on the side close to the first lower sandbox (1). The first clamping strip (5) extends to the inside of the limiting groove (6), and the first clamping strip (5) is clamped and fixed to the limiting groove (6). After the second lower sandbox (2) and the second upper sandbox (4) are separated from the first lower sandbox (1) and the first upper sandbox (3) respectively, the first lower sandbox (1) and the first upper sandbox (3) are respectively closed by a slide plate (15).

2. A combined sandbox according to claim 1, characterized in that: The front and rear ends of the second lower sandbox (2) and the second upper sandbox (4) are both provided with two first fixed cavities (16), the first fixed cavities (16) are of a through-type structure; the front and rear ends of the first lower sandbox (1) and the first upper sandbox (3) are both provided with two second fixed cavities (17), the second fixed cavities (17) are of a through-type structure, and the first fixed cavities (16) and the second fixed cavities (17) are of corresponding positions.

3. A combined sandbox according to claim 2, characterized in that: A first screw rod (8) is arranged inside the first fixed cavity (16), one end of the first screw rod (8) passes through the second fixed cavity (17) and extends to the outside of the first upper sand box (3), and the other end of the first screw rod (8) extends to the outside of the second upper sand box (4), and a first nut (7) is fixedly arranged on one side of the first screw rod (8) located outside the second upper sand box (4).

4. A combined sandbox according to claim 3, characterized in that: A second clamping strip (20) is fixedly arranged at the front and rear ends of one side of the slide plate (15), the second clamping strip (20) extends to the inside of the limiting groove (6), and the second clamping strip (20) is clamped and fixed to the limiting groove (6), and two third fixing cavities (22) are arranged at the front and rear ends inside the slide plate (15), the third fixing cavity (22) is a through-type structure, and the third fixing cavity (22) corresponds to the second fixing cavity (17) in position.

5. A combined sandbox according to claim 4, characterized in that: A third screw (28) is arranged inside the third fixed cavity (22), one end of the third screw (28) passes through the second fixed cavity (17) and extends to the outside of the first upper sandbox (3), and the other end of the third screw (28) extends to the outside of the slide plate (15), and a second nut (29) is fixedly arranged on one side of the third screw (28) located outside the slide plate (15), and a first rubber pad (19) is fixedly arranged on one side of the first nut (7) and the second nut (29) close to the first upper sandbox (3).

6. A combined sandbox according to claim 5, characterized in that: A first sealing strip (18) is fixedly provided between the connection points between the first lower sandbox (1) and the second lower sandbox (2), and between the first upper sandbox (3) and the second upper sandbox (4), and a second sealing strip (21) is fixedly provided at the connection points between the slide plate (15) and the first lower sandbox (1) and the first upper sandbox (3), respectively.

7. A combined sandbox according to claim 6, characterized in that: Four engaging cavities (24) are arranged on one side inside the first lower sandbox (1) and the first upper sandbox (3); the engaging cavities (24) are of an open structure and are communicated with the second fixed cavity (17); engaging seats (26) are fixedly arranged on the side walls at the front and rear ends inside the engaging cavities (24); an installation cylinder (23) is arranged inside the engaging cavities (24) between the engaging seats (26); a T-shaped engaging block (25) is fixedly arranged at the front and rear ends outside the engaging cylinder (23); the T-shaped engaging block (25) is fixedly engaged with the engaging seat (26); one end of the engaging cylinder (23) extends to the outside of the engaging cavity (24); a first nut (9) is fixedly arranged on one side of the engaging cylinder (23) located outside the engaging cavity (24).

8. A combined sandbox according to claim 7, characterized in that: The first nut (9) is respectively sleeved on the outside of the first screw rod (8) and the third screw rod (28), and the first nut (9) is respectively connected to the first screw rod (8) and the third screw rod (28) through threads, and a second rubber pad (27) is fixedly provided on one side of the first nut (9) close to the first upper sand box (3).

9. A combined sandbox according to claim 8, characterized in that: The front and rear ends of the first lower sandbox (1) and the second lower sandbox (2) are fixedly provided with a first fixing seat (10), the upper end of the first fixing seat (10) is fixedly provided with a second screw (11), the front and rear ends of the first upper sandbox (3) and the second upper sandbox (4) are fixedly provided with a second fixing seat (12), the second fixing seat (12) corresponds to the position of the first fixing seat (10), the interior of the second fixing seat (12) is provided with a positioning hole (14), the positioning hole (14) is a through-type structure, the second screw (11) extends to the top of the second fixing seat (12) through the positioning hole (14), the second screw (11) is located above the second fixing seat (12) and is provided with a second nut (13), the second nut (13) is connected to the second screw (11) by threads.

10. A method for combining a combined sandbox, implemented based on the combined sandbox according to claim 9, characterized in that: The steps include: Step 1: When the first lower sandbox (1) and the first upper sandbox (3) are used separately, first align the second clamping strip (20) on the slide plate (15) with the opening of the limiting groove (6) and push it into the limiting groove (6), and preliminarily close the first lower sandbox (1) and the first upper sandbox (3) by the slide plate (15). At this time, align the third screw rod (28) with the opening on one side of the third fixed cavity (22) and push it into the third fixed cavity (22) until one end of the third screw rod (28) extends out of the second fixed cavity (17), and at the same time, the first rubber pad (19) on the second nut (29) contacts and squeezes the slide plate (15); Step 2: When the third screw rod (28) needs to be fixed, first align the opening of the installation cylinder (23) with the third screw rod (28) and rotate the first nut (9), so that the first nut (9) moves outside the third screw rod (28) together with the installation cylinder (23) through the thread until the installation cylinder (23) is inserted into the inside of the clamping cavity (24). At this time, the operator rotates the entire structure of the third screw rod (28) until the T-shaped clamping block (25) on the installation cylinder (23) slides into the clamping seat (26), so as to clamp and fix the first nut (9); Step 3: When the second lower sandbox (2) and the second upper sandbox (4) are used in combination, first align the first clamping strips (5) on the second lower sandbox (2) and the second upper sandbox (4) with the openings of the limiting grooves (6) and push them into the limiting grooves (6) until the second lower sandbox (2) moves to a suitable position. At this time, align the first screw rod (8) with the opening on one side of the first fixed cavity (16) and push it into the first fixed cavity (16) until one end of the first screw rod (8) extends out of the second fixed cavity (17), and at the same time, the first rubber pad (19) on the first nut (7) contacts and squeezes the second lower sandbox (2); Step 4: When it is necessary to fix the first screw rod (8), first align the opening of the mounting tube (23) with the first screw rod (8) and rotate the first nut (9) so that the first nut (9) moves outside the third screw rod (28) together with the mounting tube (23) through the thread until the mounting tube (23) is inserted into the inside of the clamping cavity (24). At this time, the operator rotates the entire structure of the first screw rod (8) until the T-shaped clamping block (25) on the mounting tube (23) slides into the clamping seat (26), thereby clamping and fixing the first nut (9).

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