Novel mold inner container with function of eliminating mold closing seam

Abstract

The invention relates to the technical field of mold closing seam elimination, and discloses a novel mold inner container with a mold closing seam elimination function, the novel mold inner container comprises an upper closing mold and a lower closing mold, the upper closing mold is internally provided with a left-right compensation mechanism which is arranged in a left-right symmetry mode, and the lower closing mold is internally provided with an up-down compensation mechanism which is arranged in a left-right symmetry mode; tooth grooves which are meshed with each other are formed in the opposite sides of the upper closing die and the lower closing die, and chip removal holes communicating with the tooth grooves are formed in the front face of the upper closing die. The novel mold inner container with the function of eliminating the mold closing seam has the advantages that the mold closing seam is convenient to eliminate and the like, and the problems that most of existing mold closing seams are manually scraped or ground, and due to the operation mode, manual use is increased, and the appearance of a product is easily influenced and even the product is possibly damaged when the mold closing seams are eliminated through a cutting method are solved.

Description

Technical Field

[0001] The invention relates to the technical field of mold joint seam elimination, in particular to a novel mold liner with the function of eliminating the joint seam. Background Art

[0002] A mold is a tool used to make molded objects. This tool is composed of various parts. Different molds are composed of different parts. It mainly realizes the processing of the object's shape by changing the physical state of the molded material. In some molds, it is divided into an upper mold and a lower mold. When used, the upper mold and the lower mold are combined to form a molding cavity. This operation is called mold closing. Common scenarios for using molds are injection molding, blow molding, etc.

[0003] The mold seam is also called the mold line. In industrial production, the burrs on the material are called the mold seam when observed from the perspective of the mold, and the burrs are called the mold line when observed from the perspective of the product. It usually appears in the above-mentioned mold use process. Due to the invasion of materials into the gap between the upper mold and the lower mold during injection molding or other production methods, the burr-like edge is formed when the material in the gap is brought out during demolding after the processing is completed.

[0004] When the mold is divided into an upper mold and a lower mold and then closed for use, a mold seam is easily generated during the processing due to processing accuracy or wear and tear. The existing mold seams are mostly scraped or ground off manually, and this operation method not only increases the use of manpower, but also uses a cutting method to eliminate the mold seam, which is likely to affect the appearance of the product and may even damage the product. Therefore, a new mold liner with the function of eliminating the mold seam is proposed to solve the above-mentioned problem. Summary of the invention

[0005] 1. Technical issues to be solved

[0006] In view of the deficiencies in the prior art, the present invention provides a new mold liner with the function of eliminating the mold seam, which has the advantages of being easy to eliminate the mold seam, etc., and solves the problem that the existing mold seam is mostly removed by manual scraping or grinding, and this operation method not only increases the use of manpower, but also the use of cutting method to eliminate the mold seam is likely to affect the appearance of the product and may even damage the product.

[0007] (II) Technical solution

[0008] The technical solution of the present invention to solve the above technical problems is as follows: a new type of mold liner with the function of eliminating the mold seam, comprising an upper mold and a lower mold, the interior of the upper mold is provided with a left-right symmetrically arranged left-right compensation mechanism, the interior of the lower mold is provided with a left-right symmetrically arranged upper-lower compensation mechanism, the upper mold and the lower mold are provided with mutually meshing tooth grooves on opposite sides, and the front side of the upper mold is provided with a chip removal hole connected to the tooth groove;

[0009] The left and right compensation mechanism comprises a compensation plate, the compensation plate is slidably connected to the inside of the upper clamping mold, the inside of the upper clamping mold is rotatably connected to a screw rod having one end extending to the outside of the upper clamping mold, one end of the screw rod located on the outside of the upper clamping mold is fixedly connected to a first hexagonal nut, and the outer side of the screw rod is threadedly connected to an adjustment plate adapted to the compensation plate;

[0010] The upper and lower compensation mechanism includes a rotating shaft and a connecting mechanism, the rotating shaft is rotatably connected to the inside of the lower mold, the connecting mechanism extends from the inside of the upper mold to the inside of the lower mold, one end of the rotating shaft close to the outside of the lower mold is fixedly connected to a second inner hexagonal nut, the inside of the lower mold is fixedly connected to an anti-skew ring adapted to the second inner hexagonal nut, an operating hole extending to communicate with the second inner hexagonal nut is opened on the outside of the lower mold, a first bevel gear is fixedly connected to the outside of the rotating shaft, a second bevel gear is meshed with the outside of the first bevel gear, a stud with one end extending to the inside of the connecting mechanism is fixedly connected to the top of the second bevel gear, and a positioning sleeve rotatably connected to the outside of the stud is fixedly connected to the inside of the lower mold;

[0011] The connecting mechanism includes a sliding rod and a stabilizing rod, the sliding rod is fixedly connected to the inside of the upper mold, the stabilizing rod is fixedly connected to the outside of the upper mold, the stabilizing rod and the outside of the sliding rod are slidably connected to the same connecting plate, the inside of the upper mold is fixedly connected to a second spring located on the outside of the sliding rod, the second spring is close to the outside of the upper mold, and a threaded hole matching the stud is opened inside the connecting plate.

[0012] The beneficial effect of the present invention is that a shear force is generated by the slight shaking during demoulding and the tooth edge part of the tooth groove, and the material intruding between the upper mold and the lower mold is cut off by the shear force, and the cut material is pushed into the chip removal hole by the subsequent cut material and discharged from the mold through the chip removal hole.

[0013] The novel mold liner with the function of eliminating the mold seam has the advantage of being easy to eliminate the mold seam.

[0014] Based on the above technical solution, the present invention can also be improved as follows.

[0015] Furthermore, a first spring is fixedly connected between the compensation plate and the interior of the upper mold, the upper and lower sides of the compensation plate are inclined, the inner side of the lower mold is provided with an inclined surface adapted to the compensation plate, the top of the adjustment plate is provided with an anti-skew block slidably connected to the upper mold, and the bottom of the adjustment plate is inclined and adapted to the compensation plate.

[0016] The beneficial effect of adopting the above further solution is that the inclined surface below the compensation plate is arranged to facilitate stepless adjustment of the gap between the upper mold and the lower mold, thereby improving the tightness of the fit between the upper mold and the lower mold.

[0017] Furthermore, a cavity adapted to the mold core is provided between the upper mold and the lower mold, and protective sleeves adapted to the first hexagonal nut are fixedly connected to the left and right sides of the upper mold.

[0018] The beneficial effect of adopting the above further solution is that the protective sleeve can protect the first hexagon socket nut from possible collisions during transportation that may cause the first hexagon socket nut to become skewed.

[0019] Furthermore, the first tooth on the right side of the upper tooth groove is a half tooth, and its lower end is open-ended, the connecting position of the chip removal hole is between the first tooth and the second tooth on the right side of the upper tooth groove, and the outer side of the second tooth on the right side is adapted to the chip removal hole.

[0020] The beneficial effect of adopting the above further solution is that the teeth with slits can cut the extremely small parting line through slight shaking of demoulding during demoulding.

[0021] Furthermore, the connecting plate also includes a plate body and a sliding tube, the plate body is slidably connected to the outer side of the stabilizing rod, the top of the plate body is fixedly connected to the bottom of the sliding tube, the sliding tube is located inside the upper mold and is slidably connected to the outer side of the sliding rod, and the second spring is in contact with one side of the sliding tube.

[0022] The beneficial effect of adopting the above further solution is that the presence of the second spring can push the connecting plate to move, thereby compensating for the left and right tolerances while maintaining a strong connection between the upper mold and the lower mold.

[0023] Furthermore, the inner diameter of the bottom end of the threaded hole is larger than the inner diameter of the top end of the threaded hole, the threaded hole is arranged in a stepped shape, and an inclined surface is provided between two adjacent steps, and the diameter of the positioning sleeve is adapted to the inner diameter of the bottom end of the threaded hole.

[0024] The beneficial effect of adopting the above further solution is that the threaded hole with the inclined surface can guide the stud, so that the stud can be introduced into the threaded hole in time while compensating for the left and right tolerances.

[0025] Further, the two first bevel gears are respectively located on opposite sides of the two second bevel gears, and the two second hexagon socket nuts are respectively located on opposite sides of the two first bevel gears.

[0026] The beneficial effect of adopting the above further solution is that the helical gear can change the gear transmission direction, thereby reducing the transmission distance and thus improving the structural strength.

[0027] Furthermore, outer sides of the two second hexagon socket nuts are fixedly connected with a snap ring matched with the anti-skew ring, and the first hexagon socket nut and the second hexagon socket nut are both matched with an external hexagon socket wrench.

[0028] The beneficial effect of adopting the above further scheme is that the clamping ring and the anti-skew ring are adapted to each other and can limit each other to improve the tightness, thereby comprehensively limiting the second hexagon socket nut and preventing it from skew.

[0029] Furthermore, the two operating holes are both funnel-shaped, and the outer sides of the two rotating shafts are rotatably connected to reinforcement sleeves fixedly connected to the inner part of the lower clamping mold, and the two reinforcement sleeves are respectively located on opposite sides of the two second bevel gears.

[0030] The beneficial effect of adopting the above further solution is that the funnel-shaped operating hole can play a guiding role, so that an external hexagonal wrench can be easily inserted into the second hexagonal nut through the operating hole without being visible. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the structure of the present invention;

[0032] Figure 2 This is an enlarged view of the structure at A of the present invention;

[0033] Figure 3 It is a partial enlarged view of the chip removal hole and the tooth groove connection structure of the present invention;

[0034] Figure 4 This is an enlarged view of the structure at B of the present invention.

[0035] In the figure: 1. upper mold; 2. lower mold; 3. left and right compensation mechanism; 301. compensation plate; 302. screw; 303. first hexagon socket nut; 304. adjustment plate; 305. first spring; 306. anti-skew block; 4. upper and lower compensation mechanism; 401. rotating shaft; 402. second hexagon socket nut; 403. anti-skew ring; 404. operating hole; 405. first bevel gear; 406. second bevel gear; 407. stud; 408. positioning sleeve; 5. connecting mechanism; 501. sliding rod; 502. stabilizing rod; 503. connecting plate; 5031. plate body; 5032. sliding tube; 504. second spring; 505. threaded hole; 6. protective cover; 7. tooth groove; 8. chip removal hole; 9. retaining ring; 10. reinforcing sleeve. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In the embodiment, Figure 1-4A novel mold liner with a function of eliminating mold seams is provided, the invention comprises an upper mold 1 and a lower mold 2, the interior of the upper mold 1 is provided with a left-right symmetrically arranged left-right compensation mechanism 3, the interior of the lower mold 2 is provided with a left-right symmetrically arranged upper-lower compensation mechanism 4, the upper mold 1 and the lower mold 2 are provided with mutually meshing tooth grooves 7 on opposite sides, and the front side of the upper mold 1 is provided with a chip removal hole 8 connected with the tooth groove 7;

[0038] The left and right compensation mechanism 3 includes a compensation plate 301, which is slidably connected to the interior of the upper mold 1, and the interior of the upper mold 1 is rotatably connected to a screw rod 302 with one end extending to the outside of the upper mold 1, and one end of the screw rod 302 located on the outside of the upper mold 1 is fixedly connected to a first hexagonal nut 303, and the outer side of the screw rod 302 is threadedly connected to an adjustment plate 304 adapted to the compensation plate 301;

[0039] The upper and lower compensation mechanism 4 includes a rotating shaft 401 and a connecting mechanism 5, the rotating shaft 401 is rotatably connected to the inside of the lower clamping mold 2, the connecting mechanism 5 extends from the inside of the upper clamping mold 1 to the inside of the lower clamping mold 2, one end of the rotating shaft 401 close to the outside of the lower clamping mold 2 is fixedly connected with a second inner hexagonal nut 402, the inside of the lower clamping mold 2 is fixedly connected with an anti-skew ring 403 adapted to the second inner hexagonal nut 402, the outside of the lower clamping mold 2 is provided with an operating hole 404 extending to communicate with the second inner hexagonal nut 402, the outside of the rotating shaft 401 is fixedly connected with a first bevel gear 405, the outside of the first bevel gear 405 is meshed with a second bevel gear 406, the top of the second bevel gear 406 is fixedly connected with a stud 407 with one end extending to the inside of the connecting mechanism 5, and the inside of the lower clamping mold 2 is fixedly connected with a positioning sleeve 408 rotatably connected to the outside of the stud 407;

[0040] The connecting mechanism 5 includes a slide bar 501 and a stabilizing bar 502. The slide bar 501 is fixedly connected to the inside of the upper mold 1. The stabilizing bar 502 is fixedly connected to the outside of the upper mold 1. The stabilizing bar 502 and the outside of the slide bar 501 are slidably connected to the same connecting plate 503. The inside of the upper mold 1 is fixedly connected to a second spring 504 located on the outside of the slide bar 501. The second spring 504 is close to the outside of the upper mold 1. A threaded hole 505 matching the stud 407 is opened inside the connecting plate 503.

[0041] A first spring 305 is fixedly connected between the compensation plate 301 and the interior of the upper mold 1. The upper and lower sides of the compensation plate 301 are inclined. The inner side of the lower mold 2 is provided with an inclined surface adapted to the compensation plate 301. The top of the adjustment plate 304 is provided with an anti-skew block 306 slidably connected to the upper mold 1. The bottom of the adjustment plate 304 is inclined and adapted to the compensation plate 301.

[0042] The inclined surface below the compensation plate 301 is arranged to facilitate stepless adjustment of the gap between the upper clamping mold 1 and the lower clamping mold 2, thereby improving the tightness of the fit between the upper clamping mold 1 and the lower clamping mold 2;

[0043] A cavity adapted to the mold core is provided between the upper mold 1 and the lower mold 2, and a protective sleeve 6 adapted to the first hexagon socket nut 303 is fixedly connected to both the left and right sides of the upper mold 1;

[0044] The protective cover 6 can protect the first hexagon socket nut 303 from possible collisions during transportation, thereby preventing the first hexagon socket nut 303 from becoming skewed;

[0045] The first tooth on the right side of the upper tooth groove 7 is a half tooth, and its lower end is open-faced. The communication position of the chip removal hole 8 is between the first tooth on the right side and the second tooth on the upper tooth groove 7, and the outer side of the second tooth on the right side is adapted to the chip removal hole 8.

[0046] The teeth of the slotted setting can cut the extremely small parting line through the slight shaking of the demoulding process;

[0047] The connecting plate 503 further includes a plate body 5031 and a slide tube 5032. The plate body 5031 is slidably connected to the outer side of the stabilizing rod 502. The top of the plate body 5031 is fixedly connected to the bottom of the slide tube 5032. The slide tube 5032 is located inside the upper clamping mold 1 and is slidably connected to the outer side of the slide rod 501. The second spring 504 contacts one side of the slide tube 5032.

[0048] The second spring 504 can push the connecting plate 503 to move, thereby compensating for the left and right tolerances and maintaining a strong connection between the upper clamping mold 1 and the lower clamping mold 2;

[0049] The inner diameter of the bottom end of the threaded hole 505 is larger than the inner diameter of the top end of the threaded hole 505. The threaded hole 505 is arranged in a stepped shape, and an inclined surface is provided between two adjacent steps. The diameter of the positioning sleeve 408 is adapted to the inner diameter of the bottom end of the threaded hole 505.

[0050] The threaded hole 505 with an inclined surface inside can guide the stud 407, so that the stud 407 can be introduced into the threaded hole 505 in time while compensating for the left and right tolerances;

[0051] The two first bevel gears 405 are respectively located at opposite sides of the two second bevel gears 406 , and the two second hexagon socket nuts 402 are respectively located at opposite sides of the two first bevel gears 405 ;

[0052] Helical gears can change the gear transmission direction, reducing the transmission distance and thus improving the structural strength;

[0053] The outer sides of the two second hexagon socket nuts 402 are fixedly connected with a snap ring 9 adapted to the anti-skew ring 403, and the first hexagon socket nut 303 and the second hexagon socket nut 402 are adapted to an external hexagon socket wrench;

[0054] The snap ring 9 is matched with the anti-skew ring 403 to limit each other, improve the tightness, and then comprehensively limit the second hexagon socket nut 402 to prevent skew;

[0055] The two operation holes 404 are both funnel-shaped, and the outer sides of the two rotating shafts 401 are rotatably connected to the reinforcing sleeves 10 fixedly connected to the inner side of the lower clamping mold 2, and the two reinforcing sleeves 10 are respectively located on the opposite sides of the two second bevel gears 406;

[0056] The funnel-shaped operating hole 404 can play a guiding role, so that an external hexagonal wrench can be easily inserted into the second hexagonal nut 402 through the operating hole 404 without being visible.

[0057] Working principle:

[0058] Step 1: During installation, the upper mold 1 and the lower mold 2 are assembled, and an external hexagonal wrench is inserted into the second hexagonal nut 402 through the operating hole 404 and rotated. The second hexagonal nut 402 drives the rotation of the rotating shaft 401, so that the first bevel gear 405 drives the second bevel gear 406 to rotate, and the second bevel gear 406 drives the stud 407 to rotate, so that the stud 407 and the connecting plate 503 cooperate with each other to pull the upper mold 1 and the lower mold 2 closer to each other, so that the gap between the upper mold 1 and the lower mold 2 is as small as possible;

[0059] Step 2: Use an external hexagonal wrench to rotate the first hexagonal nut 303. The first hexagonal nut 303 drives the adjustment plate 304 to move via the screw rod 302, so that the adjustment plate 304 pushes the compensation plate 301 to move. The movement of the compensation plate 301 pushes the lower clamping mold 2 to move left and right, and compensates for the left and right gaps to keep the inner cavity as flat as possible. During the movement of the lower clamping mold 2, the connecting plate 503 can also slide on the outside of the sliding rod 501 and the stabilizing rod 502 to maintain connectivity.

[0060] Step 3: After the injection molding is completed, a shear force is generated between the product and the tooth tip of the tooth groove 7 through a slight shaking during demoulding, and the material intruding between the upper mold 1 and the lower mold 2 is cut off through the shear force. The cut material naturally enters the channel of the chip removal hole 8, and is pushed into the chip removal hole 8 by the subsequent cut mold seam material, and then discharged from the mold through the chip removal hole 8 by natural gravity.

[0061] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0062] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A novel mold liner with the function of eliminating mold seams, comprising an upper mold (1) and a lower mold (2), characterized in that: The upper mold (1) is provided with a left-right symmetrically arranged left-right compensation mechanism (3), the lower mold (2) is provided with a left-right symmetrically arranged upper-lower compensation mechanism (4), the upper mold (1) and the lower mold (2) are provided with mutually meshing tooth grooves (7) on opposite sides, and the upper mold (1) is provided with a chip removal hole (8) connected to the tooth groove (7) on the front side; The left and right compensation mechanism (3) comprises a compensation plate (301), the compensation plate (301) is slidably connected to the interior of the upper clamping die (1), the interior of the upper clamping die (1) is rotatably connected to a screw rod (302) having one end extending to the outside of the upper clamping die (1), one end of the screw rod (302) located on the outside of the upper clamping die (1) is fixedly connected to a first hexagonal nut (303), and the outer side of the screw rod (302) is threadedly connected to an adjustment plate (304) adapted to the compensation plate (301); The upper and lower compensation mechanism (4) comprises a rotating shaft (401) and a connecting mechanism (5), wherein the rotating shaft (401) is rotatably connected to the interior of the lower clamping mold (2), and the connecting mechanism (5) extends from the interior of the upper clamping mold (1) to the inner side of the lower clamping mold (2), and one end of the rotating shaft (401) close to the outer side of the lower clamping mold (2) is fixedly connected to a second hexagon socket nut (402), and the interior of the lower clamping mold (2) is fixedly connected to an anti-skew ring (403) adapted to the second hexagon socket nut (402), and the lower clamping mold ( 2) is provided with an operating hole (404) extending to communicate with the second hexagon socket nut (402), the outer side of the rotating shaft (401) is fixedly connected with a first bevel gear (405), the outer side of the first bevel gear (405) is meshed with a second bevel gear (406), the top of the second bevel gear (406) is fixedly connected with a stud (407) having one end extending to the inside of the connecting mechanism (5), and the interior of the lower clamping mold (2) is fixedly connected with a positioning sleeve (408) rotatably connected to the outer side of the stud (407); The connecting mechanism (5) comprises a sliding rod (501) and a stabilizing rod (502), wherein the sliding rod (501) is fixedly connected to the inside of the upper mold (1), and the stabilizing rod (502) is fixedly connected to the outside of the upper mold (1), and the stabilizing rod (502) and the outside of the sliding rod (501) are slidably connected to the same connecting plate (503), and the inside of the upper mold (1) is fixedly connected to a second spring (504) located on the outside of the sliding rod (501), and the second spring (504) is close to the outside of the upper mold (1), and a threaded hole (505) adapted to the stud (407) is provided inside the connecting plate (503).

2. A new type of mold liner with the function of eliminating mold seam according to claim 1, characterized in that: A first spring (305) is fixedly connected between the compensation plate (301) and the interior of the upper mold (1); the upper and lower sides of the compensation plate (301) are both inclined; the inner side of the lower mold (2) is provided with an inclined surface adapted to the compensation plate (301); the top of the adjustment plate (304) is provided with an anti-skew block (306) slidably connected to the upper mold (1); the bottom of the adjustment plate (304) is inclined and adapted to the compensation plate (301).

3. The novel mold liner with the function of eliminating mold seam according to claim 1, characterized in that: A cavity adapted to the mold core is provided between the upper mold (1) and the lower mold (2), and a protective sleeve (6) adapted to the first hexagon socket nut (303) is fixedly connected to the left and right sides of the upper mold (1).

4. The novel mold liner with the function of eliminating mold seam according to claim 1, characterized in that: The first tooth on the right side of the upper tooth groove (7) is a half tooth, and its lower end is open-faced. The connecting position of the chip removal hole (8) is between the first tooth on the right side and the second tooth on the upper tooth groove (7), and the outer side of the second tooth on the right side is adapted to the chip removal hole (8).

5. The novel mold liner with the function of eliminating mold seam according to claim 1, characterized in that: The connecting plate (503) further comprises a plate body (5031) and a sliding tube (5032), wherein the plate body (5031) is slidably connected to the outer side of the stabilizing rod (502), the top of the plate body (5031) is fixedly connected to the bottom of the sliding tube (5032), the sliding tube (5032) is located inside the upper mold (1) and is slidably connected to the outer side of the sliding rod (501), and the second spring (504) is in contact with one side of the sliding tube (5032).

6. The novel mold liner with the function of eliminating mold seam according to claim 1, characterized in that: The inner diameter of the bottom end of the threaded hole (505) is larger than the inner diameter of the top end of the threaded hole (505). The threaded hole (505) is arranged in a stepped shape, and an inclined surface is provided between two adjacent steps. The diameter of the positioning sleeve (408) is adapted to the inner diameter of the bottom end of the threaded hole (505).

7. The novel mold liner with the function of eliminating mold seam according to claim 1, characterized in that: The two first bevel gears (405) are respectively located on opposite sides of the two second bevel gears (406), and the two second hexagon socket nuts (402) are respectively located on opposite sides of the two first bevel gears (405).

8. The novel mold liner with the function of eliminating mold seam according to claim 1, characterized in that: The outer sides of the two second hexagon socket nuts (402) are fixedly connected with a snap ring (9) adapted to the anti-skew ring (403), and the first hexagon socket nut (303) and the second hexagon socket nut (402) are adapted to an external hexagon socket wrench.

9. The novel mold liner with the function of eliminating mold seam according to claim 1, characterized in that: The two operating holes (404) are both arranged in a funnel shape, and the outer sides of the two rotating shafts (401) are rotatably connected to a reinforcing sleeve (10) fixedly connected to the inside of the lower clamping mold (2), and the two reinforcing sleeves (10) are respectively located on opposite sides of the two second bevel gears (406).

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