CN220295803U - Explosion-proof box seat casting forming die convenient to shaping screw thread - Google Patents

Abstract

The utility model discloses an explosion-proof box seat casting forming die convenient for forming threads, which belongs to the technical field of casting dies and comprises an upper die seat, wherein the bottom end of the upper die seat is fixedly connected with an upper die for casting the inside of a junction box; the upper die holder is connected with a middle die for casting the upper end of the junction box in a contact manner; the upper die is connected with a lower die for casting the bottom of the junction box and reserving the threaded holes in a contact mode. Through the mode, the junction box is cast through the cooperation of the upper die, the middle die and the lower die, and when casting is performed, the synchronous thread rotating assembly is started to leave a threaded hole for the junction box, and after casting is finished, the synchronous thread rotating assembly automatically rotates out of the threaded rod, so that demolding is not affected.

Description

Explosion-proof box seat casting forming die convenient to shaping screw thread

Technical Field

The utility model relates to the technical field of casting molds, in particular to an explosion-proof box seat casting molding mold convenient for molding threads.

Background

For some motors used in mines, explosion protection is generally required, and meanwhile, a junction box of the explosion protection motor also has certain requirements: high barrier property, good connection positioning effect, good sealing and protecting properties. Screw holes are reserved on the junction box for installation, and usually the screw holes on the explosion-proof junction box are formed in the junction box and then punched one by one, so that the process is complex and time is consumed.

Based on the above, the utility model designs an explosion-proof box seat casting forming die which is convenient for forming threads so as to solve the problems.

Disclosure of Invention

Aiming at the defects existing in the prior art, the utility model provides an explosion-proof box seat casting forming die which is convenient for forming threads.

In order to achieve the above purpose, the utility model is realized by the following technical scheme:

the explosion-proof box seat casting forming die convenient for forming threads comprises an upper die seat, wherein the bottom end of the upper die seat is fixedly connected with an upper die used for casting the inside of a junction box; the upper die holder is connected with a middle die for casting the upper end of the junction box in a contact manner; the upper die is connected with a lower die for casting the bottom of the junction box and reserving the threaded holes in a contact mode.

Further, the upper die comprises a first positioning block, four groups of thread accommodating grooves, a groove accommodating groove and an inner wall die; the top of inner wall mould and the bottom middle part fixed connection of upper die base, first locating block is the toper, and first locating block has a plurality of groups, the top of first locating block and the bottom fixed connection of upper die base, and a plurality of groups of first locating block are along the outer circumference evenly distributed of inner wall mould, inner wall mould bottom is rectangular boss, four screw thread holding bench groove and recess holding bench groove are offered on the rectangular boss of inner wall mould bottom, four screw thread holding bench groove are offered respectively on the four corners of the rectangular boss of inner wall mould bottom, the recess holding bench groove is offered at the rectangular boss middle part of inner wall mould bottom.

Further, the middle die comprises a middle casting die and a middle drawing die; the middle casting die is arranged in the middle of the middle die, the middle drawing die is connected with the middle die in a sliding way, and the middle casting die is connected with the middle drawing die in a contact way.

Further, the top end of the middle die is in contact connection with the bottom end of the upper die base, and the bottom end of the middle die is in contact connection with the top end of the lower die.

Further, the middle casting die comprises four groups of elliptical side dies, four groups of square corner dies and a box mouth die; the box mouth die is located the top at middle part of the middle die, and the diameter of box mouth die is greater than the die diameter that oval side form and square angle form are constituteed, and the mould that oval side form and square angle form are located the lower extreme of box mouth die, and oval side form is the arc, and four sets of oval side forms are offered around the inner wall of well casting mould, and square angle form is offered between two sets of oval side forms.

Further, the middle drawing die comprises a first drawing block and a first semicircular convex block; the outer wall of the first drawing block is in fit sliding connection with the inner wall of the middle die, the first drawing block is fixedly connected with the first semicircular convex block, and one ends, close to the first semicircular convex block, of the first semicircular convex block and the first drawing block are in contact connection with one group of elliptical side dies.

Further, the lower die comprises a lower casting die, a lower drawing die and a synchronous thread rotating assembly; the lower casting die is arranged in the middle of the top end of the lower die, the inner wall of the lower die is in sliding connection with the lower drawing die, the lower casting die is in contact connection with the lower drawing die, the synchronous thread rotating assembly is fixedly connected with the bottom end of the lower die, the lower casting die and the synchronous thread rotating assembly are in contact connection with the upper die, and the top end of the lower die is in contact connection with the bottom end of the middle die.

Further, the lower casting die comprises a thread groove, a groove block and an elliptical bottom die; the four sets of thread grooves are formed in the inner wall of the bottom end of the lower casting mold, the bottoms of the sets of groove blocks are fixedly connected with the middle part of the inner wall of the bottom end of the lower casting mold, the tops of the sets of groove blocks are in contact connection with the inner wall of the bottom end of the inner wall mold, the four sets of elliptical bottom molds are fixedly connected with the inner wall of the bottom end and the side end of the lower casting mold, the inner wall of the lower casting mold at the upper end of the elliptical bottom mold is an arc corresponding to the elliptical side mold, right-angle inner walls corresponding to the square angle mold are arranged between the two sets of arc inner walls, and the thread grooves are in threaded connection with the synchronous thread rotating assembly.

Further, the lower drawing die comprises a second drawing block, a second semicircular convex block and a plurality of groups of second positioning blocks; the outer wall of second pull piece and the inner wall laminating sliding connection of bed die, the one end and the second pull piece fixed connection of second semicircle lug, the other end and the arc inner wall contact connection of lower casting mould of second semicircle lug, a plurality of groups of second locating pieces are the toper, a plurality of groups of second locating pieces are close to the inner wall fixed connection of second semicircle lug with the second pull piece, and a plurality of groups of second locating pieces evenly distributed in second semicircle lug both sides.

Further, the synchronous thread rotating assembly comprises a motor, a driving gear, a thread sleeve gear, eight groups of bearings, four groups of connecting rods, two groups of F-shaped supporting rods and four groups of threaded rods; the motor is fixedly connected with the middle part of the bottom end of the lower die, an output shaft of the motor is fixedly connected with a driving gear, one end of the F-shaped supporting rod is fixedly connected with the bottom end of the lower die, two end faces of the other end of the F-shaped supporting rod are respectively fixedly connected with a group of connecting rods, two groups of bearings are respectively connected with the upper end face and the lower end face of the connecting rods, the upper group of bearings and the lower group of bearings are respectively fixedly connected with the upper end face and the lower end face of the threaded sleeve gear, the threaded rod is in threaded connection with the threaded sleeve gear, the threaded groove is in threaded connection with the threaded rod, the top end of the threaded rod is in contact connection with the bottom end and the inner wall of the inner wall die, and the four groups of threaded sleeve gears are all in meshed connection with the driving gear.

Advantageous effects

According to the utility model, when casting, a middle die is placed at the upper end of a lower die, casting materials are poured into a box mouth die of the middle die, the upper die descends, when the bottom surface of an upper die base is contacted with the top surface of the middle die, the box mouth die is matched with a box mouth at a casting position of the bottom surface of the upper die base, a first positioning block presses a positioning hole on the box mouth, an elliptic side die and a square corner die are matched with an inner wall die to press the outer wall of the junction box, four corners of the outer wall of the junction box are right angles, protruding arcs are arranged between two groups of right angles, and a semicircular hollow junction nozzle is formed between a first semicircular lug and a first drawing block;

according to the utility model, during casting, casting materials enter a lower casting die in the middle of a lower die, an inner wall die and the inner wall of the lower casting die extrude the inner wall and the outer wall of a junction box, the top end of a groove block passes through the casting materials and a groove accommodating table groove to be in contact connection with the bottom end of the inner wall die, after casting molding, a groove is arranged in the groove accommodating table, the groove penetrates through the bottom of the junction box, an elliptical bottom die and an elliptical side die of a lower drawing die are matched and cast to form a convex semi-elliptical outer wall, the outer wall of a second semi-circular convex block and the inner wall of the lower die are cast to form a hollow arc junction nozzle, the arc junction nozzle and the arc junction nozzle of the middle drawing die are combined into a complete circular junction nozzle, a second positioning block is extruded out of the outer wall of the junction nozzle, a motor of a synchronous thread rotating assembly is started to drive a gear to rotate, the gear is driven to drive a thread sleeve gear to rotate, the thread sleeve gear drives a threaded rod to rotate upwards, and the threaded rod passes through the thread groove, the casting materials and the groove is in contact with the bottom end of the inner wall die, and a threaded hole is reserved; when casting is finished, the motor reversely rotates to drive the threaded rod to downwards rotate and rotate out of the threaded hole, so that the demoulding of the molded junction box is not affected.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is evident that the drawings in the following description are only some embodiments of the present utility model and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.

FIG. 1 is a perspective view of a main body structure of an explosion-proof box base casting mold for facilitating thread molding;

FIG. 2 is a front view of a casting mold for an explosion-proof box base, which is convenient for forming threads;

FIG. 3 is a perspective view of a main body structure of an explosion-proof box base casting mold for facilitating thread molding according to the present utility model;

FIG. 4 is a perspective view of a main body structure of an explosion-proof box base casting mold for facilitating thread molding according to the present utility model;

FIG. 5 is a perspective view of a main body structure of an explosion-proof box base casting mold for facilitating thread molding according to the present utility model;

FIG. 6 is a diagram showing the construction of a lower mold of an explosion-proof box base casting mold for facilitating the molding of threads according to the present utility model;

fig. 7 is an enlarged view at a in fig. 3.

Reference numerals in the drawings represent respectively: 1. an upper die holder; 2. an upper die; 21. a first positioning block; 22. a thread receiving groove; 23. the groove accommodates the table groove; 24. an inner wall mold; 3. a middle mold; 31. casting a middle casting mold; 311. elliptic side mold; 312. square angle mould; 313. a box mouth mold; 32. a middle drawing die; 321. a first drawing block; 322. a first semicircular bump; 4. a lower die; 41. casting a mold; 411. a thread groove; 412. a groove block; 413. an elliptical bottom die; 42. a lower drawing die; 421. a second drawing block; 422. a second semicircular bump; 423. a second positioning block; 43. a synchronous thread rotating assembly; 431. a motor; 432. driving a gear; 433. a gear is sleeved on the thread; 434. a bearing; 435. a connecting rod; 436. an F-shaped supporting rod; 437. a threaded rod.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. It will be apparent that the described embodiments are some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The utility model is further described below with reference to examples.

Example 1

Referring to fig. 1-7 of the specification, an explosion-proof box base casting forming die convenient for forming threads comprises an upper die base 1;

the bottom end of the upper die holder 1 is fixedly connected with an upper die 2 for casting the inside of the junction box;

the upper die 2 comprises a first positioning block 21, four sets of thread accommodating table grooves 22, a groove accommodating table groove 23 and an inner wall die 24; the top end of the inner wall die 24 is fixedly connected with the middle part of the bottom end of the upper die holder 1, the first positioning blocks 21 are conical, the top end of the first positioning blocks 21 are fixedly connected with the bottom end of the upper die holder 1, the plurality of groups of first positioning blocks 21 are uniformly distributed along the outer circumference of the inner wall die 24, the bottom end of the inner wall die 24 is a rectangular boss, four groups of thread accommodating table grooves 22 and groove accommodating table grooves 23 are formed in the rectangular boss at the bottom end of the inner wall die 24, four groups of thread accommodating table grooves 22 are respectively formed in four corners of the rectangular boss at the bottom end of the inner wall die 24, and the groove accommodating table grooves 23 are formed in the middle part of the rectangular boss at the bottom end of the inner wall die 24;

during casting, the upper die 2 is moved downwards, the first positioning block 21 is provided with a plurality of groups of positioning holes at the box opening, the positioning holes are connected and positioned when the box is convenient to use, the inner wall die 24, the middle die 3 and the lower die 4 are matched to form a cylindrical cavity, the bottom of the cylindrical cavity is rectangular, four groups of thread accommodating table grooves 22 are formed in the inner bottom of the rectangular in an extruding mode, and the groove accommodating table grooves 23 are formed in the inner bottom of the rectangular in an extruding mode;

in some embodiments, as shown in fig. 1-7, as a preferred embodiment of the present utility model, the upper die holder 1 is in contact with a middle die 3 for casting the upper end of the junction box;

the middle mold 3 comprises a middle casting mold 31 and a middle drawing mold 32; the middle casting die 31 is arranged in the middle of the middle die 3, the middle drawing die 32 is connected with the middle die 3 in a sliding way, and the middle casting die 31 is connected with the middle drawing die 32 in a contact way;

the top end of the middle die 3 is in contact connection with the bottom end of the upper die holder 1, and the bottom end of the middle die 3 is in contact connection with the top end of the lower die 4;

the middle casting mould 31 of the middle mould 3 is matched with the upper mould 2 to press out the upper end and the box opening of the junction box, the middle drawing mould 32 is matched with the lower drawing mould 42 to cast out the junction nozzle, and when casting is completed, the middle drawing mould 32 is drawn out, so that the mould is convenient to take out;

the middle casting mold 31 comprises four groups of elliptical side molds 311, four groups of square corner molds 312 and a box opening mold 313; the box mouth mold 313 is positioned at the top end of the middle part of the middle mold 3, the diameter of the box mouth mold 313 is larger than the mold diameter formed by the elliptical side mold 311 and the square corner mold 312, the mold formed by the elliptical side mold 311 and the square corner mold 312 is positioned at the lower end of the box mouth mold 313, the elliptical side mold 311 is arc-shaped, four groups of elliptical side molds 311 are arranged around the inner wall of the middle casting mold 31, and the square corner mold 312 is arranged between the two groups of elliptical side molds 311;

the middle drawing die 32 comprises a first drawing block 321 and a first semicircular convex block 322; the outer wall of the first drawing block 321 is in fit sliding connection with the inner wall of the middle mold 3, the first drawing block 321 is fixedly connected with the first semicircular convex block 322, and one end, close to the first semicircular convex block 322, of the first drawing block 321 is in contact connection with one group of elliptical side molds 311;

when casting, the middle die 3 is placed at the upper end of the lower die 4, casting materials are poured into the box opening die 313 of the middle casting die 31, the upper die 2 descends, when the bottom surface of the upper die holder 1 is contacted with the top surface of the middle die 3, the box opening die 313 is matched with a box opening at the casting position of the bottom surface of the upper die holder 1, the first positioning block 21 presses out a positioning hole on the box opening, the elliptic side die 311 and the square corner die 312 are matched with the inner wall die 24 to press out the outer wall of the junction box, four corners of the outer wall of the junction box are right angles, protruding arcs are formed between the two groups of right angles, and a semicircular hollow junction nozzle is formed between the first semicircular convex block 322 and the first drawing block 321;

in some embodiments, as shown in fig. 1-7, as a preferred embodiment of the present utility model, the upper mold 2 is in contact with a lower mold 4 for casting the bottom of the junction box and reserving the threaded holes;

the lower die 4 comprises a lower casting die 41, a lower drawing die 42 and a synchronous thread rotating assembly 43; the lower casting mould 41 is arranged in the middle of the top end of the lower mould 4, the inner wall of the lower mould 4 is in sliding connection with the lower drawing mould 42, the lower casting mould 41 is in contact connection with the lower drawing mould 42, the synchronous thread rotating assembly 43 is fixedly connected with the bottom end of the lower mould 4, and the lower casting mould 41 and the synchronous thread rotating assembly 43 are in contact connection with the upper mould 2;

the top end of the lower die 4 is in contact connection with the bottom end of the middle die 3;

during casting, the bottom end of the middle die 3 is contacted with the top end of the lower die 4, the lower drawing die 42 is aligned with the middle drawing die 32, the lower casting die 41 is aligned with the middle casting die 31, the lower casting die 41 is matched with the upper die 2 to cast out the bottom of the die, the lower drawing die 42 is used for casting out the lower half part of the junction nozzle, the synchronous thread rotating assembly 43 is used for casting threaded holes of the junction box, after casting is finished, the lower drawing die 42 is drawn out, the synchronous thread rotating assembly 43 is automatically rotated out of the threaded rods 437, and the junction box with the threaded holes is reserved for forming;

the lower casting mold 41 includes a screw groove 411, a groove block 412 and an elliptical bottom mold 413; four groups of thread grooves 411 are formed in the inner wall of the bottom end of the lower casting mold 41, the bottoms of a plurality of groups of groove blocks 412 are fixedly connected with the middle part of the inner wall of the bottom end of the lower casting mold 41, the tops of a plurality of groups of groove blocks 412 are in contact connection with the inner wall of the bottom end of the inner wall mold 24, four groups of elliptical bottom molds 413 are fixedly connected with the inner wall of the bottom end and the side end of the lower casting mold 41, the inner wall of the lower casting mold 41 positioned at the upper end of the elliptical bottom mold 413 is an arc corresponding to the elliptical side mold 311, and a right-angle inner wall corresponding to the square angle mold 312 is arranged between the two groups of arc inner walls;

the screw slot 411 is screw-coupled with the synchronous screw rotating assembly 43;

preferably, the number of sets of groove blocks 412 is three;

the lower drawing die 42 includes a second drawing block 421, a second semicircular bump 422, and a plurality of second positioning blocks 423; the outer wall of the second drawing block 421 is in fit sliding connection with the inner wall of the lower die 4, one end of the second semicircular convex block 422 is fixedly connected with the second drawing block 421, the other end of the second semicircular convex block 422 is in contact connection with the arc-shaped inner wall of the lower casting die 41, a plurality of groups of second positioning blocks 423 are conical, a plurality of groups of second positioning blocks 423 are fixedly connected with the inner wall of the second drawing block 421 close to the second semicircular convex block 422, and a plurality of groups of second positioning blocks 423 are uniformly distributed on two sides of the second semicircular convex block 422;

the synchronous thread rotating assembly 43 comprises a motor 431, a driving gear 432, a thread sleeve gear 433, eight groups of bearings 434, four groups of connecting rods 435, two groups of F-shaped supporting rods 436 and four groups of threaded rods 437; the motor 431 is fixedly connected with the middle part of the bottom end of the lower die 4, an output shaft of the motor 431 is fixedly connected with the driving gear 432, one end of the F-shaped supporting rod 436 is fixedly connected with the bottom end of the lower die 4, two end faces of the other end of the F-shaped supporting rod 436 are respectively fixedly connected with one group of connecting rods 435, two groups of bearings 434 are respectively connected with the upper end face and the lower end face of the threaded sleeve gear 433, the threaded rod 437 is in threaded connection with the threaded sleeve gear 433, the threaded slot 411 is in threaded connection with the threaded rod 437, the top end of the threaded stem 437 is in contact connection with the bottom end inner wall of the inner wall die 24, and four groups of threaded sleeve gears 433 are in meshed connection with the driving gear 432;

during casting, casting materials enter a lower casting die 41 in the middle of a lower die 4, an inner wall die 24 and the inner wall of the lower casting die 41 are pressed out of the inner wall and the outer wall of the junction box, the top end of a groove block 412 penetrates through the casting materials and a groove containing table groove 23 to be in contact connection with the bottom end of the inner wall die 24, after casting forming, a groove is arranged in the groove containing table, the groove penetrates through the bottom of the junction box, an elliptical bottom die 413 and an elliptical side die 311 of a lower drawing die 42 are matched with each other to cast out a convex semi-elliptical outer wall, the outer wall of a second semicircular convex block 422 and the inner wall of the lower die 4 are cast out of a hollow arc-shaped junction nozzle, the arc-shaped junction nozzle and the arc-shaped junction nozzle of the middle drawing die 32 are jointly synthesized into a complete circular junction nozzle, a second positioning block 423 is pressed out of a positioning hole on the outer wall of the junction nozzle, a motor 431 of a synchronous thread rotating component 43 is started, a driving gear 432 is driven to drive to rotate, a thread sleeve gear 433 is driven to drive a threaded rod 437 to rotate, the threaded rod 437 penetrates through the thread groove 411, the casting materials and the thread containing table groove 22 to be in contact connection with the bottom end of the inner wall die 24, and a reserved threaded hole is reserved; when casting is finished, the motor 431 reversely rotates to drive the threaded rod 437 to downwards rotate and rotate out of the threaded hole, so that the demolding of the molded junction box is not affected.

The above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims (10)

1. Explosion-proof box seat casting forming die convenient to shaping screw thread, including upper die base (1), its characterized in that:

the bottom end of the upper die holder (1) is fixedly connected with an upper die (2) for casting the inside of the junction box;

the upper die holder (1) is connected with a die (3) for casting the upper end of the junction box in a contact manner;

the upper die (2) is connected with a lower die (4) for casting the bottom of the junction box and reserving the threaded holes in a contact mode.

2. The explosion-proof box base casting mold for facilitating the molding of threads according to claim 1, wherein the upper mold (2) comprises a first positioning block (21), four sets of thread receiving grooves (22), a groove receiving groove (23) and an inner wall mold (24); the top of inner wall mould (24) is fixedly connected with the bottom middle part of upper die base (1), first locating block (21) is the toper, and first locating block (21) have a plurality of groups, the top of first locating block (21) and the bottom fixed connection of upper die base (1), and a plurality of group first locating block (21) are evenly distributed along the outside circumference of inner wall mould (24), inner wall mould (24) bottom is rectangular boss, four screw thread holding bench groove (22) and recess holding bench groove (23) are seted up on the rectangular boss of inner wall mould (24) bottom, four screw thread holding bench groove (22) are seted up on the four corners of the rectangular boss of inner wall mould (24) bottom respectively, recess holding bench groove (23) are seted up at the rectangular boss middle part of inner wall mould (24) bottom.

3. The explosion-proof box base casting mold for facilitating the molding of threads according to claim 2, wherein the middle mold (3) comprises a middle casting mold (31) and a middle drawing mold (32); the middle casting die (31) is arranged in the middle of the middle die (3), the middle drawing die (32) is connected with the middle die (3) in a sliding way, and the middle casting die (31) is connected with the middle drawing die (32) in a contact way.

4. An explosion-proof box base casting forming die convenient for forming threads according to claim 3, wherein the top end of the middle die (3) is in contact connection with the bottom end of the upper die base (1), and the bottom end of the middle die (3) is in contact connection with the top end of the lower die (4).

5. The explosion-proof box base casting mold for facilitating the molding of threads according to claim 4, wherein the middle casting mold (31) comprises four sets of elliptical side molds (311), four sets of square corner molds (312) and a box mouth mold (313); the box mouth mold (313) is located the top at middle part of middle mold (3), the diameter of box mouth mold (313) is greater than the mold diameter that oval side form (311) and square angle form (312) are constituteed, the mold that oval side form (311) and square angle form (312) are located the lower extreme of box mouth mold (313), oval side form (311) are the arc, four sets of oval side form (311) are offered around the inner wall of well casting mold (31), square angle form (312) are offered between two sets of oval side forms (311).

6. The explosion-proof box base casting mold for facilitating the molding of threads according to claim 5, wherein the middle drawing mold (32) comprises a first drawing block (321) and a first semicircular convex block (322); the outer wall of the first drawing block (321) is in fit sliding connection with the inner wall of the middle die (3), the first drawing block (321) is fixedly connected with the first semicircular convex block (322), and one ends, close to the first semicircular convex block (322), of the first drawing block (321) are in contact connection with one group of elliptical side dies (311).

7. The explosion-proof box base casting mold for facilitating the molding of threads according to claim 6, wherein the lower mold (4) comprises a lower casting mold (41), a lower drawing mold (42) and a synchronous thread rotating assembly (43); the lower casting mold (41) is arranged in the middle of the top end of the lower mold (4), the inner wall of the lower mold (4) is in sliding connection with the lower drawing mold (42), the lower casting mold (41) is in contact connection with the lower drawing mold (42), the synchronous thread rotating assembly (43) is fixedly connected with the bottom end of the lower mold (4), the lower casting mold (41) and the synchronous thread rotating assembly (43) are in contact connection with the upper mold (2), and the top end of the lower mold (4) is in contact connection with the bottom end of the middle mold (3).

8. The explosion-proof box base casting mold for facilitating the molding of threads according to claim 7, wherein the lower casting mold (41) comprises a thread groove (411), a groove block (412) and an elliptical bottom mold (413); four sets of thread grooves (411) are formed in the inner wall of the bottom end of the lower casting die (41), the bottoms of a plurality of sets of groove blocks (412) are fixedly connected with the middle part of the inner wall of the bottom end of the lower casting die (41), the tops of a plurality of sets of groove blocks (412) are in contact connection with the inner wall of the bottom end of the inner wall die (24), four sets of elliptical bottom dies (413) are fixedly connected with the inner wall of the bottom end and the side end of the lower casting die (41), the inner wall of the lower casting die (41) positioned at the upper end of the elliptical bottom die (413) is an arc corresponding to the elliptical side die (311), right-angle inner walls corresponding to the square angle die (312) are arranged between the two sets of arc inner walls, and the thread grooves (411) are in threaded connection with the synchronous thread rotating assembly (43).

9. The explosion-proof box base casting mold for facilitating thread forming according to claim 8, wherein the lower drawing die (42) comprises a second drawing block (421), a second semicircular bump (422) and a plurality of groups of second positioning blocks (423); the outer wall of second pull piece (421) and the inner wall laminating sliding connection of bed die (4), the one end and the second pull piece (421) fixed connection of second semicircle lug (422), the other end and the arc inner wall contact of lower casting mould (41) of second semicircle lug (422) are connected, a plurality of second locating pieces (423) of group are the toper, a plurality of second locating pieces (423) and second pull piece (421) are close to the inner wall fixed connection of second semicircle lug (422), and a plurality of second locating pieces (423) evenly distributed in second semicircle lug (422) both sides.

10. The explosion-proof box base casting mold facilitating thread molding according to claim 9, wherein the synchronous thread rotating assembly (43) comprises a motor (431), a driving gear (432), a thread bushing gear (433), eight groups of bearings (434), four groups of connecting rods (435), two groups of F-shaped supporting rods (436) and four groups of threaded rods (437); the motor (431) is fixedly connected with the middle part of the bottom end of the lower die (4), an output shaft of the motor (431) is fixedly connected with the driving gear (432), one end of the F-shaped supporting rod (436) is fixedly connected with the bottom end of the lower die (4), two end faces of the other end of the F-shaped supporting rod (436) are respectively fixedly connected with one group of connecting rods (435), two groups of bearings (434) are respectively connected with the upper end face and the lower end face of the threaded sleeve gear (433), the threaded rod (437) is in threaded connection with the threaded sleeve gear (433), the threaded groove (411) is in threaded connection with the threaded rod (437), the top end of the threaded rod (437) is in contact connection with the bottom end inner wall of the inner wall die (24), and four groups of threaded sleeve gears (433) are all in meshed connection with the driving gear (432).