Casting sandbox and casting method thereof

Abstract

The invention discloses a casting sandbox and a casting method thereof, relates to the field of casting sandboxes, and aims to solve the problems that in the prior art, an upper box body and a lower box body of an existing sandbox are stacked, and a stably connected fixing mechanism is not arranged between the two box bodies, so that the upper box body shakes on the lower box body, and the casting effect is poor. And the pouring quality is influenced. Limiting pipes are fixedly connected to the two sides of the middle of the upper end of the fixing base, a lower box body is arranged in the middle of the upper end of the fixing base, an upper box body is connected to the upper end of the lower box body, and the upper end of the lower box body and the lower end of the upper box body are in limiting connection through four detachable positioning rod assemblies. Stable connecting mechanisms are fixedly connected to the middles of the two sides of the upper box body, lifting grooves are formed in the stable connecting mechanisms, circular connecting pieces are connected to the interiors of the lifting grooves in a limiting mode, and conical guide grooves are formed in the middles of the lower end faces of the circular connecting pieces; and a second threaded hole is communicated between the upper end of the conical guide groove and the upper end surface of the circular connecting piece.

Description

Technical Field

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

[0002] The casting sandbox is an important equipment used in the casting process. It is mainly used for the molding and pouring process in the casting operation. The casting sandbox has a wide range of uses, including but not limited to the casting of various metals such as aluminum alloy casting, cast iron casting, cast steel casting, etc. Its design and manufacture take into account the specific needs of the casting process to ensure the quality and production efficiency of the castings. The design and manufacture of the casting sandbox involves many aspects, including material selection, structural design, size specifications, etc. According to different casting needs, the casting sandbox can be made of different materials, such as wood, aluminum, cast iron, ductile iron and cast steel. The selection of these materials is based on their physical properties and durability to ensure stability under high temperature and pressure.

[0003] For example, application publication number CN 112499497 A discloses a sand box lifting system for casting steel parts, which relates to the field of lifting equipment, including guide rails, a crane and a casting sand box. The transmission box on the crane is connected to a hydraulic lifting support, and a pair of bearing seats are provided at one end of a cross beam fixed at the upper end of the hydraulic lifting support. A drum is provided on a cable rotating shaft connected between the two bearing seats, and a lifting bracket is fixed at the lower end of the lifting steel cable wound on the drum. The lifting steel cables tied at both ends of the lifting bracket are connected to the casting sand box. Beneficial effects: the present invention is provided with a stabilizing component to fix and stabilize the four sides of the casting sand box to prevent the casting sand box from shifting during the lifting process. The work is carried out by controlling a steering motor. A driven pulley is provided at the lower end of the output shaft of the steering motor, and a toothed belt is used to transmit the power to the driving pulley provided at the lower end of the steering shaft, thereby completing the rotation adjustment of the hydraulic lifting support.

[0004] The upper and lower boxes of the existing sandbox are stacked, and there is no stable fixing mechanism between the two boxes, so that the upper box will shake on the lower box, affecting the casting quality; therefore, the market urgently needs to develop a casting sandbox to help people solve the existing problems. Summary of the invention

[0005] The object of the present invention is to provide a casting sand box to solve the problem that the upper and lower boxes of the existing sand box proposed in the above background technology are stacked and there is no fixing mechanism for stably connecting the two boxes, so that the upper box will shake on the lower box, affecting the casting quality.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a casting sand box, comprising a fixed seat, both sides of the middle of the upper end of the fixed seat are fixedly connected to a limiting tube, a rotating shaft is arranged inside the limiting tube, the upper end of the rotating shaft extends out of the upper end of the limiting tube and is fixedly connected to a first screw, both sides of the fixed seat are provided with transmission shafts that respectively drive the two rotating shafts to rotate, a lower box body is arranged in the middle of the upper end of the fixed seat, circular grooves are arranged at the front and rear ends of both sides of the upper end of the lower box body, and the lower box body is connected to a first screw at the lower end of the circular groove. A threaded hole, the upper end of the lower box is connected to the upper box, and second positioning holes are provided at both ends of the front and rear sides of the lower end of the upper box. The upper end of the lower box and the lower end of the upper box are limitedly connected by four detachable positioning rod assemblies, and the middle parts of both sides of the upper box are fixedly connected with stable connection mechanisms, and a lifting groove is provided inside the stable connection mechanism, and a circular connecting piece is limitedly connected inside the lifting groove, and a conical guide groove is provided in the middle part of the lower end surface of the circular connecting piece, and a second threaded hole is connected between the upper end of the conical guide groove and the upper end surface of the circular connecting piece.

[0007] Preferably, the lower end of the rotating shaft extends into the interior of the fixing seat and is fixedly connected to a first bevel gear, one end of the transmission shaft is fixedly connected to a second bevel gear, and the first bevel gear is meshingly connected with the teeth of the second bevel gear.

[0008] Preferably, the other end of the transmission shaft extends out of the side end surface of the fixing seat and is fixedly connected to a turntable.

[0009] Preferably, first positioning rods are fixedly connected to the front and rear ends of both sides of the middle part of the upper end surface of the fixing seat, first positioning holes are provided at the front and rear ends of both sides of the lower end surface of the lower box body, and four first positioning rods are respectively inserted into the four first positioning holes of the lower end surface of the lower box body.

[0010] Preferably, the detachable positioning rod assembly includes a limiting disc and a second positioning rod, the second positioning rod is fixedly connected to the middle part of the upper end of the limiting disc, the lower end of the limiting disc is fixedly connected to a second screw, the limiting disc slides into the circular groove and the second screw is inserted into the first threaded hole and fixedly connected by thread, the upper end of the limiting disc and the front and rear ends of the second positioning rod are fixedly connected to a rotating plate.

[0011] Preferably, a circular groove extends from the upper end of the second positioning rod and is inserted into the second positioning hole on the upper box body.

[0012] Preferably, rectangular limiting sliding grooves are provided on both sides of the lifting groove, and rectangular limiting parts are fixedly connected to both sides of the circular connecting member.

[0013] Preferably, the two rectangular limiting portions on the circular connecting member slide into the two rectangular limiting sliding grooves on both sides of the lifting groove respectively.

[0014] The upper end of the first screw extends into the lifting slot and passes through the second threaded hole. The first screw is threadedly connected to the second threaded hole.

[0015] A casting method comprises the following steps:

[0016] Step 1: Fix the fixing seat in a suitable position, place the lower box in the middle of the upper end surface of the fixing seat, insert the four first positioning rods on the fixing seat into the four first positioning holes on the lower end surface of the lower box respectively, position the lower box, introduce the casting sand into the lower box and tamp it, and put in the main original model;

[0017] Step 2: Insert the second screw at the lower end of the limiting disc through the circular groove and into the first threaded hole, and drive the limiting disc and the second screw to rotate through the rotating piece, so that the second screw is connected and fixed with the inner thread of the first threaded hole, and at the same time, the limiting disc and the rotating piece are completely slid into the circular groove;

[0018] Step 3: Place the upper box body on the upper end of the lower box body, insert the second positioning rods at the upper ends of the four limiting discs into the four second positioning holes of the upper box body respectively, so that the upper box body and the lower box body are stably connected;

[0019] Step 4: When the upper box is placed on the upper end of the lower box, the upper end of the first screw on the rotating shaft will be inserted into the lifting slot of the stable connection mechanism and the tapered guide slot of the circular connection piece. When the upper box is lowered and placed on the upper end of the lower box, the first screw will lift the circular connection piece and rise along the lifting slot. When the upper box is stably connected to the lower box, the drive shaft is driven to rotate through the turntable, and then the rotating shaft is driven to rotate, so that the first screw rotates. When the first screw rotates, it is threadedly connected with the second threaded hole inside the circular connection piece, driving the circular connection piece to descend, so that the lower end of the circular connection piece contacts the lower end surface of the lifting slot of the stable connection mechanism, and then the stable connection mechanism is pulled down, so that the upper box presses down the lower box, so that the upper box and the lower box are fixed on the fixed seat, and the casting sand can be poured into the upper box.

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

[0021] 1. In the invention, through the setting of the stable connection mechanism, the middle parts of both sides of the upper box body are fixedly connected with the stable connection mechanism, the inside of the stable connection mechanism is provided with a lifting groove, the inside of the lifting groove is limitedly connected with a circular connection piece, the middle part of the lower end surface of the circular connection piece is provided with a conical guide groove, the upper end of the conical guide groove and the upper end surface of the circular connection piece are connected with a second threaded hole, the upper end of the first screw extends into the lifting groove and passes through the second threaded hole, the first screw is threadedly connected with the inside of the second threaded hole, and when the upper box body is lowered and placed on the upper end of the lower box body, the first screw will move the circular connection piece The connecting piece is lifted up and rises along the lifting groove. When the upper box body is stably connected to the lower box body, the transmission shaft is driven to rotate through the turntable, and then the rotating shaft is driven to rotate, so that the first screw rotates. When the first screw rotates, it is threadedly connected with the second threaded hole inside the circular connecting piece, driving the circular connecting piece to descend, so that the lower end of the circular connecting piece contacts the lower end surface of the lifting groove of the stable connecting mechanism, and then the stable connecting mechanism is pulled down, so that the upper box body presses down the lower box body, so that the upper box body and the lower box body are fixed on the fixed seat, to prevent shaking between the upper box body and the lower box body during pouring, which affects the pouring quality.

[0022] 2. In the invention, through the setting of the detachable positioning rod assembly, the upper end of the lower box body and the lower end of the upper box body are limitedly connected by four detachable positioning rod assemblies. The detachable positioning rod assembly includes a limiting disc and a second positioning rod. The second positioning rod is fixedly connected to the middle part of the upper end of the limiting disc. The lower end of the limiting disc is fixedly connected with a second screw. The limiting disc slides into the inside of the circular groove and the second screw is inserted into the inside of the first threaded hole for threaded connection and fixation. The upper end of the limiting disc and the front and rear ends of the second positioning rod are fixedly connected with a rotating piece, so that the limiting disc and The second screw is rotated so that the detachable positioning rod assembly can be removed from the upper end of the lower box body, which is convenient for stacking the lower box body when storing. At the same time, after the detachable positioning rod assembly is fixed to the lower box body, the limiting disc and the rotating plate will completely slide into the circular groove, so that after the upper box body is placed on the upper end of the lower box body, the lower end surface of the upper box body and the upper end surface of the lower box body remain in contact, and the upper end of the second positioning rod extends out of the circular groove and is inserted into the second positioning hole on the upper box body, which is convenient for the upper box body to be accurately placed on the upper end of the box body, while preventing the upper box body from shaking at the upper end of the lower box body, thereby ensuring the stability of the upper box body.

[0023] 3. In the invention, through the setting of the first positioning rod, the front and rear ends on both sides of the middle part of the upper end surface of the fixed seat are fixedly connected with the first positioning rod, the front and rear ends on both sides of the lower end surface of the lower box body are provided with first positioning holes, and the four first positioning rods are respectively inserted into the four first positioning holes on the lower end surface of the lower box body, so as to facilitate the accurate placement of the lower box body in the middle part of the upper end of the fixed seat, and at the same time prevent the lower box body from moving on the upper end of the fixed seat, thereby ensuring the stable position of the lower box body. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a front view of a casting sand box of the present invention;

[0025] Figure 2 It is a main cross-sectional view of the stable connection mechanism of the present invention;

[0026] Figure 3 It is a main cross-sectional view of the detachable positioning rod assembly of the present invention;

[0027] Figure 4 It is a structural diagram of the detachable positioning rod assembly of the present invention;

[0028] Figure 5 It is an enlarged view of the detail A of the present invention;

[0029] Figure 6 It is an enlarged view of detail B of the present invention;

[0030] Figure 7 It is an enlarged view of detail C of the present invention.

[0031] In the figure: 1. fixed seat; 101. first positioning rod; 102. transmission shaft; 103. first bevel gear; 104. turntable; 2. limiting tube; 201. rotating shaft; 202. first screw rod; 203. second bevel gear; 3. lower box body; 301. first positioning hole; 302. circular groove; 303. first threaded hole; 4. stable connection mechanism; 401. lifting groove; 402. rectangular limiting slide groove; 5. circular connecting piece; 501. conical guide groove; 502. second threaded hole; 503. rectangular limiting part; 6. detachable positioning rod assembly; 601. limiting disc; 602. second screw rod; 603. second positioning rod; 604. rotating plate; 7. upper box body; 701. second positioning hole. DETAILED DESCRIPTION

[0032] 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.

[0033] See also Figure 1-7, an embodiment of the present invention: a casting sand box, comprising a fixed seat 1, both sides of the middle of the upper end of the fixed seat 1 are fixedly connected to the limiting tube 2, a rotating shaft 201 is arranged inside the limiting tube 2, the upper end of the rotating shaft 201 extends out of the upper end of the limiting tube 2 and is fixedly connected to the first screw 202, both sides of the fixed seat 1 are provided with transmission shafts 102 for driving the two rotating shafts 201 to rotate respectively, the lower end of the rotating shaft 201 extends to the inside of the fixed seat 1 and is fixedly connected to the first bevel gear 103, one end of the transmission shaft 102 is fixedly connected to the second bevel gear 203, the first bevel gear 103 is meshed with the second bevel gear 203, and the rotating shaft 201 is driven by the transmission shaft 102 to rotate The first screw rod 202 is driven to rotate, and the other end of the transmission shaft 102 extends out of the side end face of the fixed seat 1 and is fixedly connected to the turntable 104, and the transmission shaft 102 is driven to rotate by the turntable 104, and a lower box body 3 is arranged in the middle of the upper end of the fixed seat 1, and the front and rear ends on both sides of the middle of the upper end face of the fixed seat 1 are fixedly connected with the first positioning rods 101, and the front and rear ends on both sides of the lower end face of the lower box body 3 are arranged with the first positioning holes 301, and the four first positioning rods 101 are respectively inserted into the four first positioning holes 301 on the lower end face of the lower box body 3, so as to facilitate the lower box body 3 to be accurately placed in the middle of the upper end of the fixed seat 1, and at the same time prevent the lower box body 3 from moving on the upper end of the fixed seat 1, so as to ensure the stable position of the lower box body 3.

[0034] Furthermore, circular grooves 302 are provided at the front and rear ends on both sides of the upper end of the lower box body 3, and first threaded holes 303 are connected inside the lower box body 3 and at the lower ends of the circular grooves 302. The upper end of the lower box body 3 is connected to the upper box body 7, and second positioning holes 701 are provided at the front and rear ends on both sides of the lower end of the upper box body 7. The upper end of the lower box body 3 and the lower end of the upper box body 7 are limitedly connected by four detachable positioning rod assemblies 6. The detachable positioning rod assembly 6 includes a limiting disc 601 and a second positioning rod 603. The second positioning rod 603 is fixedly connected to the middle part of the upper end of the limiting disc 601, and the lower end of the limiting disc 601 is fixedly connected to the second screw 602. The limiting disc 601 slides into the circular groove 302 and inserts the second screw 602 into the first threaded hole 303. The upper end of the limiting disc 601 and the front and rear ends of the second positioning rod 603 are fixedly connected with a rotating piece 604, so that the limiting disc 601 and the second screw 602 can be driven to rotate through the rotating piece 604, so that the detachable positioning rod assembly 6 can be removed from the upper end of the lower box body 3, which is convenient for stacking the lower box body 3 when storing. At the same time, after the detachable positioning rod assembly 6 is fixed to the lower box body 3, the limiting disc 601 and the rotating piece 604 will completely slide into the circular groove 302, so that after the upper box body 7 is placed on the upper end of the lower box body 3, the lower end surface of the upper box body 7 and the upper end surface of the lower box body 3 remain in contact, and the upper end of the second positioning rod 603 extends out of the circular groove 302 and is inserted into the second positioning hole 701 on the upper box body 7, which is convenient for the upper box body 7 to be accurately placed At the upper end of the lower box body 3, the upper box body 7 is prevented from shaking at the upper end of the lower box body 3 to ensure the stability of the upper box body 7. The middle parts of both sides of the upper box body 7 are fixedly connected with stable connecting mechanisms 4. A lifting groove 401 is arranged inside the stable connecting mechanism 4. Rectangular limiting slide grooves 402 are arranged on both sides of the lifting groove 401. A circular connector 5 is connected to the lifting groove 401 in a limiting manner. Rectangular limiting parts 503 are fixedly connected on both sides of the circular connector 5. The two rectangular limiting parts 503 on the circular connector 5 slide into the two rectangular limiting slide grooves 402 on both sides of the lifting groove 401 respectively, so that the circular connector 5 can be lifted and lowered in the lifting groove 401. At the same time, the rectangular limiting parts 503 are used to prevent the circular connector 5 from rotating. The middle part of the lower end surface of the circular connector 5 is provided with a A conical guide groove 501 is provided, and a second threaded hole 502 is connected between the upper end of the conical guide groove 501 and the upper end surface of the circular connector 5. The upper end of the first screw 202 extends to the inside of the lifting groove 401 and passes through the second threaded hole 502. The first screw 202 is threadedly connected with the second threaded hole 502. When the upper box body 7 is lowered and placed on the upper end of the lower box body 3, the first screw 202 will lift the circular connector 5 and rise along the lifting groove 401. When the upper box body 7 is stably connected with the lower box body 3, the transmission shaft 102 is driven to rotate through the turntable 104, and then the rotating shaft 201 is driven to rotate, so that the first screw 202 rotates. When the first screw 202 rotates, it is threadedly connected with the second threaded hole 502 inside the circular connector 5, driving the circular connector 5 to descend.After the lower end of the circular connector 5 contacts the lower end surface of the lifting groove 401 of the stable connection mechanism 4, the stable connection mechanism 4 is pulled down, so that the upper box body 7 presses down the lower box body 3, so that the upper box body 7 and the lower box body 3 are fixed on the fixing seat 1, so as to prevent the upper box body 7 and the lower box body 3 from shaking during pouring, which affects the pouring quality.

[0035] A casting method comprises the following steps:

[0036] Step 1: fix the fixing seat 1 in a suitable position, place the lower box 3 in the middle of the upper end surface of the fixing seat 1, insert the four first positioning rods 101 on the fixing seat 1 into the four first positioning holes 301 on the lower end surface of the lower box 3 respectively, position the lower box 3, introduce the casting sand into the lower box 3 and tamp it, and put the main original model;

[0037] Step 2: Insert the second screw 602 at the lower end of the limiting disc 601 through the circular groove 302 and into the first threaded hole 303, and drive the limiting disc 601 and the second screw 602 to rotate through the rotating piece 604, so that the second screw 602 is connected and fixed with the inner thread of the first threaded hole 303, and at the same time, the limiting disc 601 and the rotating piece 604 are completely slid into the circular groove 302;

[0038] Step 3: Place the upper box 7 on the upper end of the lower box 3, insert the second positioning rods 603 on the upper ends of the four limiting discs 601 into the four second positioning holes 701 of the upper box 7 respectively, so that the upper box 7 is stably connected to the lower box 3;

[0039] Step 4: When the upper box body 7 is placed on the upper end of the lower box body 3, the upper end of the first screw 202 on the rotating shaft 201 will be inserted into the lifting groove 401 of the stable connection mechanism 4, and inserted into the tapered guide groove 501 of the circular connection piece 5. When the upper box body 7 is lowered and placed on the upper end of the lower box body 3, the first screw 202 will lift the circular connection piece 5 and rise along the lifting groove 401. When the upper box body 7 is stably connected with the lower box body 3, the transmission shaft 102 is driven to rotate through the turntable 104, thereby driving the rotating shaft 201 to rotate, so that the first screw 202 rotates. When the first screw 202 rotates, it is threadedly connected with the second threaded hole 502 inside the circular connection piece 5, driving the circular connection piece 5 to descend, so that the lower end of the circular connection piece 5 contacts the lower end surface of the lifting groove 401 of the stable connection mechanism 4, and then the stable connection mechanism 4 is pulled down, so that the upper box body 7 presses down the lower box body 3, so that the upper box body 7 and the lower box body 3 are fixed on the fixing seat 1, and the casting sand can be poured into the upper box body 7.

[0040] 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 casting sand box, comprising a fixing seat (1), characterized in that: The middle of the upper end of the fixed seat (1) is fixedly connected to a limiting tube (2) on both sides, a rotating shaft (201) is arranged inside the limiting tube (2), the upper end of the rotating shaft (201) extends out of the upper end of the limiting tube (2) and is fixedly connected to a first screw rod (202), transmission shafts (102) are arranged on both sides inside the fixed seat (1) for driving the two rotating shafts (201) to rotate respectively, a lower box body (3) is arranged in the middle of the upper end of the fixed seat (1), front and rear ends of both sides of the upper end of the lower box body (3) are provided with circular grooves (302), the lower box body (3) is connected to the lower end of the circular groove (302) with a first threaded hole (303), and the upper end of the lower box body (3) is connected to An upper box body (7) is provided, and second positioning holes (701) are provided at both front and rear ends of the lower end of the upper box body (7). The upper end of the lower box body (3) and the lower end of the upper box body (7) are limitedly connected by four detachable positioning rod assemblies (6). The middle parts of both sides of the upper box body (7) are fixedly connected with stable connection mechanisms (4). A lifting groove (401) is provided inside the stable connection mechanism (4). A circular connection piece (5) is limitedly connected inside the lifting groove (401). A conical guide groove (501) is provided in the middle part of the lower end surface of the circular connection piece (5). A second threaded hole (502) is connected between the upper end of the conical guide groove (501) and the upper end surface of the circular connection piece (5).

2. A casting sand box according to claim 1, characterized in that: The lower end of the rotating shaft (201) extends into the interior of the fixed seat (1) and is fixedly connected to a first bevel gear (103); one end of the transmission shaft (102) is fixedly connected to a second bevel gear (203); the first bevel gear (103) and the second bevel gear (203) are meshedly connected.

3. A casting sand box according to claim 1, characterized in that: The other end of the transmission shaft (102) extends out of the side end surface of the fixing seat (1) and is fixedly connected to a rotating disk (104).

4. A casting sand box according to claim 1, characterized in that: First positioning rods (101) are fixedly connected to the front and rear ends of both sides of the middle part of the upper end surface of the fixing seat (1), and first positioning holes (301) are provided at the front and rear ends of both sides of the lower end surface of the lower box body (3), and four of the first positioning rods (101) are respectively inserted into the four first positioning holes (301) of the lower end surface of the lower box body (3).

5. A casting sand box according to claim 1, characterized in that: The detachable positioning rod assembly (6) comprises a limiting disc (601) and a second positioning rod (603), wherein the second positioning rod (603) is fixedly connected to the middle part of the upper end of the limiting disc (601), and the lower end of the limiting disc (601) is fixedly connected to a second screw rod (602), the limiting disc (601) slides into the inside of the circular groove (302) and the second screw rod (602) is inserted into the inside of the first threaded hole (303) and is threadedly connected and fixed, and a rotating piece (604) is fixedly connected to the upper end of the limiting disc (601) and to both the front and rear ends of the second positioning rod (603).

6. A casting sand box according to claim 5, characterized in that: The upper end of the second positioning rod (603) extends out of the circular groove (302) and is inserted into the second positioning hole (701) on the upper box body (7).

7. A casting sand box according to claim 1, characterized in that: Rectangular limiting sliding grooves (402) are provided on both sides of the lifting groove (401), and rectangular limiting portions (503) are fixedly connected to both sides of the circular connecting member (5).

8. A casting sand box according to claim 7, characterized in that: The two rectangular limiting portions (503) on the circular connecting member (5) slide into the two rectangular limiting sliding grooves (402) on both sides of the lifting groove (401) respectively.

9. A casting sand box according to claim 1, characterized in that: The upper end of the first screw rod (202) extends into the interior of the lifting slot (401) and passes through the second threaded hole (502), and the first screw rod (202) is threadedly connected to the interior of the second threaded hole (502).

10. A casting method, implemented based on a casting sandbox according to any one of claims 1 to 9, characterized in that: The steps include: Step 1: fix the fixing seat (1) at a suitable position, place the lower box (3) in the middle of the upper end surface of the fixing seat (1), insert the four first positioning rods (101) on the fixing seat (1) into the four first positioning holes (301) on the lower end surface of the lower box (3), position the lower box (3), introduce casting sand into the lower box (3) and compact it, and put in the main original model; Step 2: The second screw rod (602) at the lower end of the limiting disc (601) is inserted into the first threaded hole (303) after passing through the circular groove (302), and the limiting disc (601) and the second screw rod (602) are driven to rotate by the rotating piece (604), so that the second screw rod (602) is connected and fixed with the internal thread of the first threaded hole (303), and at the same time, the limiting disc (601) and the rotating piece (604) are completely slid into the circular groove (302); Step 3: Place the upper box body (7) on the upper end of the lower box body (3), and insert the second positioning rods (603) at the upper ends of the four limiting discs (601) into the four second positioning holes (701) of the upper box body (7) respectively, so that the upper box body (7) and the lower box body (3) are stably connected; Step 4: When the upper box (7) is placed on the upper end of the lower box (3), the upper end of the first screw (202) on the rotating shaft (201) is inserted into the lifting groove (401) of the stable connection mechanism (4) and the conical guide groove (501) of the circular connection member (5). When the upper box (7) is lowered and placed on the upper end of the lower box (3), the first screw (202) lifts the circular connection member (5) and moves up along the lifting groove (401). When the upper box (7) is stably connected to the lower box (3), the transmission shaft (102) is driven to rotate through the turntable (104). , thereby driving the rotating shaft (201) to rotate, causing the first screw rod (202) to rotate. When the first screw rod (202) rotates, it is threadedly connected with the second threaded hole (502) inside the circular connecting member (5), driving the circular connecting member (5) to descend, so that the lower end of the circular connecting member (5) contacts the lower end surface of the lifting groove (401) of the stable connecting mechanism (4), and then the stable connecting mechanism (4) is pulled down, thereby causing the upper box body (7) to press down the lower box body (3), so that the upper box body (7) and the lower box body (3) are fixed on the fixing seat (1), and the casting sand can be poured into the upper box body (7).

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