阅读说明：本技术 一种可调节注塑尺寸的空心圆形塑料模具 (Hollow circular plastic mold with adjustable injection molding size ) 是由 钟建雯 于 2021-01-14 设计创作，主要内容包括：本发明公开了一种可调节注塑尺寸的空心圆形塑料模具,包括注塑箱以及设置于所述注塑箱中的注塑腔,所述注塑腔中心转动设有转动轴,所述转动轴上设有不动盘,本发明设有内外双层结构的环形挤压模板,且内外双层的模板都能根据需要进行伸长或缩短,达到加工不同厚度、不同尺寸大小的空心圆形模型的目的,且在内外层结构的模板伸缩时能有补模板降落将空缺处进行补充,使得扩张后的模板保持圆形,能够制作出符合尺寸的空心圆形模型,且本发明将注塑液体沿着模具板表面下流,大大减少了产生气泡的可能,且分流管道较多,使得注塑效率不会降低,且提高了工件成型率,同时本发明实现了处理过程自动化,大大提高了处理效率,节省了劳动力。(The invention discloses a hollow circular plastic mould capable of adjusting injection molding size, which comprises an injection molding box and an injection molding cavity arranged in the injection molding box, wherein a rotating shaft is arranged at the center of the injection molding cavity in a rotating manner, a fixed disk is arranged on the rotating shaft, the invention is provided with an annular extrusion template with an inner-outer double-layer structure, the inner-outer double-layer template can be extended or shortened according to needs, so that the purpose of processing hollow circular models with different thicknesses and sizes is achieved, the template with the inner-outer layer structure can be descended to supplement the vacant positions when being stretched, so that the expanded template can keep a circular shape, hollow circular models with the size can be manufactured, and injection molding liquid flows downwards along the surface of the mould plate, the possibility of generating bubbles is greatly reduced, more shunt pipelines are provided, the injection molding efficiency cannot be reduced, and the workpiece forming rate is improved, meanwhile, the invention realizes the automation of the treatment process, greatly improves the treatment efficiency and saves the labor force.)

1. The utility model provides an adjustable hollow circular plastic mold who moulds plastics size, including the case of moulding plastics and set up in mould plastics the chamber of moulding plastics in the case, its characterized in that: the injection molding cavity is characterized in that a rotating shaft is arranged at the center of the injection molding cavity in a rotating mode, a fixed disc is arranged on the rotating shaft, a plurality of square moving grooves are formed in the fixed disc in an array mode, extension rods capable of moving along the square moving grooves are arranged in the square moving grooves, inner blocking templates are fixedly arranged on the outer sides of the extension rods and can move in the injection molding cavity, a rotating disc is fixedly arranged above the fixed disc, an annular fixed rack is fixedly arranged on the outer ring of the rotating disc, a plurality of arc moving grooves are formed in the rotating disc, the number of the arc moving grooves is the same as that of the square moving grooves, moving blocks are fixedly arranged on the extension rods and extend into the arc moving grooves and can move along the arc moving grooves, a power motor is fixedly arranged at the top of the injection molding cavity, a power shaft is rotatably arranged on the power motor and extends to the bottom of the injection molding cavity, the power shaft is positioned on the left side of the rotating shaft, staggered gears are fixedly arranged on the power shaft, power gears are fixedly arranged below the staggered gears and are in meshing transmission with the annular fixed racks, so that the power gears can drive the rotating disc to rotate, a plurality of fixed inner side supports are arranged at the top of the injection molding cavity in an array mode, the number of the inner side supports is the same as that of the inner blocking templates, inner rotating shafts are rotatably arranged on the inner side supports, the inner rotating shafts are in transmission connection through inner driving belts, inner rotating gears are fixedly arranged on the inner rotating shafts, the inner rotating gears on the left side can be in meshing transmission with the staggered gears, return springs are elastically arranged on the outer sides of the inner side supports, inner blocking templates are fixedly connected to the lower ends of the return springs, and are positioned in gaps of the inner blocking templates, when the inner blocking template extends outwards, the inner side complementary templates move downwards to the bottom to seal the gap of the inner blocking template, so that the inner blocking template and the inner side complementary templates form a closed circle, inner side fixed racks are fixedly arranged on the inner sides of the inner side complementary templates and are meshed with the corresponding inner side rotating gears, outer side supports are fixedly arranged on the outer sides of the inner side supports, the number of the outer side supports is the same as that of the inner side supports, outer side rotating shafts are rotatably arranged on the outer side supports, the outer side rotating shafts are in transmission connection through outer side transmission belts, outer side rotating gears are fixedly arranged on the outer side rotating shafts, supporting springs are fixedly connected to the outer sides of the outer side supports, outer side complementary templates are fixedly arranged at the lower ends of the supporting springs, and included angles are formed between the outer side complementary templates and the inner side complementary templates, when the inner blocking template continues to move outwards, the outer side complementary templates move downwards to the bottom to seal the gap of the inner blocking template, outer side fixed racks are fixedly arranged on the inner sides of the outer side complementary templates and are in meshing transmission with the corresponding outer side rotating gears, a plurality of pushing telescopic rods are arranged on the inner wall of the injection molding cavity in an array mode, outer blocking templates are fixedly arranged on the pushing telescopic rods and can move along the bottom of the injection molding cavity, a plurality of induction sensors are arranged on the bottom end array, the number of the induction sensors is the same as that of the outer blocking templates, the outer blocking templates are located at the bottoms of the pushing telescopic rods, inner side telescopic rods with the same number as that of the outer blocking templates are arranged on the top array of the injection molding cavity, an inner layer complementary template is fixedly arranged below the inner side telescopic rods, and outer side telescopic rods are fixedly arranged outside the inner side telescopic rods, the outer side telescopic link below all is fixed and is equipped with outer benefit template, inlayer benefit template outer benefit template downstream to the bottom can with different positions outer fender template clearance seals, the fixed annular siphunculus mouth that is equipped with in chamber top of moulding plastics, siphunculus mouth in interior fender template with between the outer fender template.

2. The hollow circular plastic mold capable of adjusting injection molding size according to claim 1, wherein: the fixed disc is connected with the rotating shaft through a bearing, so that the rotating shaft cannot drive the fixed disc to rotate when rotating, the rotating disc can be driven to rotate when the rotating shaft rotates, and the moving block drives the extension rod to move outwards.

3. The hollow circular plastic mold capable of adjusting injection molding size according to claim 1, wherein: the injection molding device is characterized in that an incomplete gear is fixedly arranged on the power shaft, a transmission shaft is rotatably arranged on the right side of the power shaft, a transmission gear is fixedly arranged below the transmission shaft, the incomplete gear can be meshed with the transmission gear and enables the incomplete gear to intermittently rotate, so that the transmission gear rotates after the power gear rotates for multiple times, a transmission bevel gear is fixedly arranged below the transmission gear, a bevel gear shaft is rotatably arranged on the rear wall of the injection molding cavity, a meshing bevel gear is fixedly arranged on the bevel gear shaft and is in meshing transmission with the transmission bevel gear, and the bevel gear shaft and the outer side rotating shaft on the right side are in transmission through a linkage belt, so that when the inner blocking template extends to the longest outside, the outer side complementary template is driven to move to the bottom of the injection molding cavity to seal gaps among the inner blocking.

4. The hollow circular plastic mold capable of adjusting injection molding size according to claim 1, wherein: the inner side rotating shaft is in friction connection with the inner side rotating gear, so that the inner side rotating gear does not rotate any more after the inner side complementary template moves to the bottom of the injection molding cavity, and machine damage caused by continuous movement of the inner side complementary template is prevented.

5. The hollow circular plastic mold capable of adjusting injection molding size according to claim 1, wherein: the mouth of pipe top all is fixed and is equipped with the bin outlet, the bin outlet below is connected with a plurality of honeycomb ducts, honeycomb duct quantity with outer fender template is the same, every outer fender template is last all fixed to be equipped with the solid fixed bolster, equal fixedly connected with on the solid fixed bolster the honeycomb duct makes the entering the injection molding material of injection molding intracavity portion can be followed outer fender template wall is downflow, reduces the production of bubble, just honeycomb duct quantity with outer fender template is the same makes the injection molding material fall into rate increase when the injection molding intracavity portion prevents to cause the solidification of injection molding material because of the circulation time overlength.

Technical Field

The invention relates to a hollow circular plastic mold with adjustable injection molding size, and mainly relates to the technical field of plastic molds.

Background

The plastic mould is a tool which is matched with a plastic forming machine in the plastic processing industry to endow the plastic product with complete configuration and accurate size, the plastic mould has various types and processing methods, and the structures of the plastic forming machine and the plastic product are various, so the types and the structures of the plastic mould are also various, the size of the mould is determined according to the required processing size at the present stage, each mould with different sizes needs to be specially customized, a large amount of material consumption is caused, the purpose of processing workpieces with different sizes is achieved by manually replacing the mould after pouring and forming, time and labor are wasted, the efficiency is low, air bubbles are generated when injection liquid flows into the mould, the damage of the forming mould is easily caused, and the invention improves the defects.

Disclosure of Invention

The invention aims to solve the technical problem of providing a hollow circular plastic mould capable of adjusting the injection molding size, and overcomes the problems.

The invention is realized by the following technical scheme.

The invention relates to a hollow circular plastic mold capable of adjusting injection molding size, which comprises an injection molding box and an injection molding cavity arranged in the injection molding box, wherein a rotating shaft is arranged at the center of the injection molding cavity in a rotating manner, a fixed disk is arranged on the rotating shaft, a plurality of square moving grooves are arranged on the fixed disk in an array manner, extension rods capable of moving along the square moving grooves are arranged in the square moving grooves, inner baffle templates are fixedly arranged on the outer sides of the extension rods and can move in the injection molding cavity, a rotating disk is fixedly arranged above the fixed disk, an annular fixed rack is fixedly arranged on the outer ring of the rotating disk, a plurality of arc moving grooves are arranged in the rotating disk, the number of the arc moving grooves is the same as that of the square moving grooves, moving blocks are fixedly arranged on the extension rods and extend into the arc moving grooves and can move along the arc moving grooves, the injection molding device is characterized in that a power motor is fixedly arranged at the top of the injection molding cavity, a power shaft is rotatably arranged on the power motor, the power shaft extends to the bottom of the injection molding cavity and is positioned on the left side of the rotating shaft, staggered gears are fixedly arranged on the power shaft, power gears are fixedly arranged below the staggered gears and are in meshing transmission with annular fixed racks, so that the power gears can drive the rotating disc to rotate, a plurality of fixed inner side supports are arranged at the top of the injection molding cavity in an array mode, the number of the inner side supports is equal to that of the inner baffle templates, inner rotating shafts are rotatably arranged on the inner side supports, the inner rotating shafts are in transmission connection through inner driving belts, inner rotating gears are fixedly arranged on the inner rotating shafts, and the inner rotating gears on the left side can be in meshing transmission with the staggered gears, the outer sides of the inner side supports are respectively and elastically provided with a return spring, the lower ends of the return springs are respectively and fixedly connected with an inner side complementary template, the inner side complementary templates are positioned at the gap of the inner blocking templates, and when the inner blocking templates extend outwards, the inner side complementary templates move downwards to the bottom to seal the gap of the inner blocking templates, so that the inner blocking templates and the inner side complementary templates form a closed circle, inner side fixed racks are respectively and fixedly arranged at the inner sides of the inner side complementary templates, the inner side fixed racks are respectively engaged with the corresponding inner side rotating gears, outer side supports are respectively and fixedly arranged at the outer sides of the inner side supports, the number of the outer side supports is the same as that of the inner side supports, outer side rotating shafts are respectively and rotatably arranged on the outer side supports, the outer side rotating shafts are respectively and rotatably connected through outer side transmission belts, and outer side rotating gears are respectively and fixedly arranged on the outer, the outer sides of the outer side supports are fixedly connected with supporting springs, outer side complementary templates are fixedly arranged at the lower ends of the supporting springs, included angles are formed between the outer side complementary templates and the inner side complementary templates, when the inner side complementary templates continue to move outwards, the outer side complementary templates move downwards to the bottom to close gaps of the inner side complementary templates, outer side fixed racks are fixedly arranged at the inner sides of the outer side complementary templates, the outer side fixed racks are meshed with the corresponding outer side rotating gears for transmission, a plurality of pushing telescopic rods are arranged on the inner wall of the injection molding cavity in an array mode, outer baffle templates are fixedly arranged on the pushing telescopic rods and can move along the bottom of the injection molding cavity, a plurality of induction sensors are arranged on the bottom end array, the number of the induction sensors is the same as that of the outer baffle templates, and the outer baffle templates are located at the pushing bottom, the utility model discloses a mould plastics, including mould plastics chamber top array, inboard telescopic link, inlayer benefit template, outer mould board and outer mould board, mould plastics chamber top array be equipped with quantity with the inboard telescopic link that the outer mould board is the same, inboard telescopic link below is all fixed and is equipped with the inlayer benefit template, inboard telescopic link outside is all fixed and is equipped with the outside telescopic link, outside telescopic link below is all fixed and is equipped with the outer mould board of mending, the inlayer benefit template the outer mould board downstream to the bottom can be with different positions the outer mould board clearance that keeps off seals, the fixed annular siphunculus mouth that is equipped with in mould plastics chamber top, siphunculus.

Furthermore, the fixed disc is connected with the rotating shaft through a bearing, so that the rotating shaft cannot drive the fixed disc to rotate due to rotation, the rotating disc can be driven to rotate when the rotating shaft rotates, and the moving block drives the extension rod to move outwards.

Further, an incomplete gear is fixedly arranged on the power shaft, a transmission shaft is arranged on the right side of the power shaft in a rotating mode, a transmission gear is fixedly arranged below the transmission shaft, the incomplete gear can be meshed with the transmission gear and enables the incomplete gear to intermittently rotate, the transmission gear rotates after the power gear rotates for multiple times, a transmission bevel gear is fixedly arranged below the transmission gear, a bevel gear shaft is rotatably arranged on the rear wall of the injection molding cavity, a meshing bevel gear is fixedly arranged on the bevel gear shaft and is in meshing transmission with the transmission bevel gear, and the bevel gear shaft and the outer side rotating shaft on the right side are in transmission through a linkage belt, so that when the inner blocking template extends to the longest outside, the outer side complementary template is driven to move to the bottom of the injection molding cavity to seal the gap between the inner blocking templates.

Furthermore, the inner side rotating shaft is in friction connection with the inner side rotating gear, so that the inner side rotating gear does not rotate any more after the inner side complementary template moves to the bottom of the injection molding cavity, and machine damage caused by continuous movement of the inner side complementary template is prevented.

Further, all fixed bin outlet that is equipped with in logical mouth of pipe top, the bin outlet below is connected with a plurality of honeycomb ducts, honeycomb duct quantity with it is the same, every to keep off the template outward and all fixed being equipped with the solid fixed bolster in keeping off the template outward, equal fixedly connected with on the solid fixed bolster the honeycomb duct makes the entering the injection molding material of injection molding intracavity portion can be followed it is downflow to keep off the template wall outward, reduces the production of bubble, just honeycomb duct quantity with it makes the injection molding material fall into to keep off the template outward the rate increase when moulding intracavity portion prevents to cause the solidification of injection molding material because of the circulation time overlength.

The invention has the beneficial effects that: the invention is provided with the annular extrusion template with the inner and outer double-layer structures, the inner and outer double-layer templates can be extended or shortened according to needs, the purpose of processing hollow circular models with different thicknesses and sizes is achieved, the templates with the inner and outer layer structures can be supplemented by the falling of the supplementary template when being stretched, so that the expanded templates can keep circular shapes, and hollow circular models with the sizes can be manufactured.

Drawings

In order to more clearly illustrate the embodiments of the invention 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, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

The invention is further illustrated with reference to the following figures and examples.

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic view of the structure a-a in fig. 1.

Fig. 3 is an enlarged schematic view of B in fig. 1.

Fig. 4 is an enlarged schematic view of C in fig. 2.

Detailed Description

The invention will now be described in detail with reference to fig. 1-4, wherein for ease of description the orientations described hereinafter are now defined as follows: the up, down, left, right, and front-back directions described below correspond to the up, down, left, right, and front-back directions in the projection relationship of fig. 1 itself.

Referring to the attached drawings 1-4, the hollow circular plastic mold capable of adjusting injection molding size comprises an injection molding box 10 and an injection molding cavity 11 arranged in the injection molding box 10, wherein a rotating shaft 12 is rotatably arranged at the center of the injection molding cavity 11, a fixed disk 13 is arranged on the rotating shaft 12, a plurality of square moving grooves 14 are arranged on the fixed disk 13 in an array manner, extension rods 18 capable of moving along the square moving grooves 14 are arranged in the square moving grooves 14, inner blocking templates 19 are fixedly arranged on the outer sides of the extension rods 18, the inner blocking templates 19 can move in the injection molding cavity 11, a rotating disk 17 is fixedly arranged above the fixed disk 13, an annular fixed rack 60 is fixedly arranged on the outer ring of the rotating disk 17, a plurality of arc moving grooves 15 are arranged in the rotating disk 17, the number of the arc moving grooves 15 is the same as that of the square moving grooves 14, moving blocks 16 are fixedly arranged on the extension rods 18, the moving block 16 extends into the arc-shaped moving groove 15 and can move along the arc-shaped moving groove 15, a power motor 23 is fixedly arranged at the top of the injection molding cavity 11, a power shaft 20 is rotatably arranged on the power motor 23, the power shaft 20 extends to the bottom of the injection molding cavity 11, the power shaft 20 is positioned at the left side of the rotating shaft 12, a staggered gear 22 is fixedly arranged on the power shaft 20, a power gear 21 is fixedly arranged below the staggered gear 22, the power gear 21 is in meshing transmission with the annular fixed rack 60, so that the power gear 21 can drive the rotating disc 17 to rotate, a plurality of fixed inner side brackets 31 are arranged at the top of the injection molding cavity 11 in an array manner, the number of the inner side brackets 31 is the same as that of the inner baffle plates 19, inner side rotating shafts 53 are rotatably arranged on the inner side brackets 31, and the inner side rotating shafts 53 are in transmission connection through inner side transmission belts 55, the inner rotating shafts 53 are all fixedly provided with inner rotating gears 54, the inner rotating gears 54 on the left side and the staggered gears 22 can be in meshing transmission, the outer sides of the inner brackets 31 are all elastically provided with return springs 32, the lower ends of the return springs 32 are all fixedly connected with inner complementary templates 35, the inner complementary templates 35 are positioned at the gaps of the inner complementary templates 19, when the inner complementary templates 19 extend outwards, the inner complementary templates 35 move downwards to the bottom to seal the gaps of the inner complementary templates 19, so that the inner complementary templates 19 and the inner complementary templates 35 form a closed circle, the inner fixed racks 36 are all fixedly arranged on the inner sides of the inner complementary templates 35, the inner fixed racks 36 are all meshed with the corresponding inner rotating gears 54, the outer sides of the inner brackets 31 are all fixedly provided with outer brackets 33, and the number of the outer brackets 33 is the same as that of the inner brackets 31, the outer side supports 33 are respectively rotatably provided with outer side rotating shafts 50, the outer side rotating shafts 50 are connected through outer side transmission belts 52 in a transmission manner, the outer side rotating shafts 50 are respectively fixedly provided with outer side rotating gears 51, the outer sides of the outer side supports 33 are respectively and fixedly connected with supporting springs 34, the lower ends of the supporting springs 34 are respectively and fixedly provided with outer side complementary templates 37, included angles are formed between the outer side complementary templates 37 and the inner side complementary templates 35, when the inner blocking templates 19 continue to move outwards, the outer side complementary templates 37 move downwards to the bottom to close gaps of the inner blocking templates 19, outer side fixed racks 38 are respectively and fixedly arranged on the inner sides of the outer side complementary templates 37, the outer side fixed racks 38 are respectively in meshing transmission with the corresponding outer side rotating gears 51, the array on the inner wall of the injection molding cavity 11 is provided with a plurality of pushing telescopic rods 39, and the outer blocking templates 40 are respectively and fixedly arranged on the pushing telescopic rods, the outer blocking templates 40 can move along the bottom of the injection molding cavity 11, the bottom array is provided with a plurality of induction sensors 41, the number of the induction sensors 41 is the same as that of the outer baffle plates 40, the outer baffle plates 40 are positioned at the bottom of the pushing telescopic rod 39, the top array of the injection molding cavity 11 is provided with inner side expansion rods 44 with the same number as the outer baffle templates 40, an inner layer supplementary formwork 45 is fixedly arranged below the inner side telescopic rods 44, outer side telescopic rods 42 are fixedly arranged outside the inner side telescopic rods 44, outer layer complementary templates 43 are fixedly arranged below the outer side telescopic rods 42, the inner layer complementary templates 45 and the outer layer complementary templates 43 move downwards to the bottom to seal the gaps of the outer blocking templates 40 at different positions, an annular through pipe opening 49 is fixedly arranged at the top of the injection molding cavity 11, and the through pipe opening 49 is positioned between the inner blocking template 19 and the outer blocking template 40.

Advantageously, the stationary disc 13 is connected to the rotating shaft 12 by a bearing, so that rotation of the rotating shaft 12 does not rotate the stationary disc 13, so that rotation of the rotating shaft 12 causes rotation of the rotating disc 17, and the moving block 16 causes the extension rod 18 to move outwards.

Advantageously, an incomplete gear 24 is fixedly arranged on the power shaft 20, a transmission shaft 25 is rotatably arranged at the right side of the power shaft 20, a transmission gear 26 is fixedly arranged below the transmission shaft 25, the incomplete gear 24 can be meshed with the transmission gear 26 and can make the incomplete gear intermittently rotate, so that the transmission gear 26 rotates after the power gear 21 rotates for a plurality of times, a transmission bevel gear 27 is fixedly arranged below the transmission gear 26, a bevel gear shaft 28 is rotatably arranged on the rear wall of the injection molding cavity 11, a meshing bevel gear 29 is fixedly arranged on the bevel gear shaft 28, the meshing bevel gear 29 is in meshing transmission with the transmission bevel gear 27, the bevel gear shaft 28 and the outer rotating shaft 50 on the right side are driven by a linkage belt 30, when the inner die plate 19 extends to the longest outside, the outer die plate 37 is driven to move to the bottom of the injection molding cavity 11 to close the gap between the inner die plates 19.

Advantageously, the inner rotating shaft 53 is in frictional connection with the inner rotating gear 54, so that the inner rotating gear 54 does not rotate after the inner complementary mold plate 35 moves to the bottom of the injection cavity 11, and machine damage caused by the continuous movement of the inner complementary mold plate 35 is prevented.

Beneficially, all fixedly above the through pipe opening 49, a discharge opening 48 is arranged, a plurality of guide pipes 47 are connected below the discharge opening 48, the number of the guide pipes 47 is the same as that of the outer baffle plate 40, each outer baffle plate 40 is fixedly provided with a fixed supporting block 46, and the guide pipes 47 are fixedly connected to the fixed supporting blocks 46, so that injection molding materials entering the injection molding cavity 11 can flow downwards along the wall of the outer baffle plate 40, bubbles are reduced, and the number of the guide pipes 47 is the same as that of the outer baffle plate 40, so that the injection molding materials fall into the injection molding cavity 11, the injection molding materials are prevented from being solidified due to overlong circulation time.

Sequence of mechanical actions of the whole device: when the size of the required hollow circle needs to be larger, the power motor 23 is started to drive the power shaft 20 to rotate, the power shaft 20 drives the power gear 21 to rotate, the power gear 21 drives the annular fixed rack 60 and the rotating disc 17 to rotate, so that the motion block 16 moves outwards along the arc-shaped motion groove 15 in the rotating disc 17, and the motion block 16 drives the extension rod 18 to move outwards along the square motion groove 14 because the motion block 16 is still in the square motion groove 14, the purpose of pushing the inner blocking template 19 to expand outwards is achieved, the power shaft 20 rotates and simultaneously drives the staggered gears 22 to rotate, the staggered gears 22 drive the inner side rotating gears 54 to rotate, the inner side rotating gears 54 drive the inner side rotating shafts 53 to rotate, the inner side rotating shafts 53 drive all the inner side rotating shafts 53 to rotate through the inner side transmission belts 55, the inner side rotating shafts 53 drive the corresponding inner side rotating gears 54 to rotate, so that the corresponding inner side fixed racks 36 are driven to move, the corresponding inner side complementary templates 35 all move downwards to the lowest position, the inner side complementary templates 35 and the inner blocking template 19 are mutually touched to be sealed into a larger circle again, when the larger circle is needed, the power motor 23 continues to rotate, the staggered gears 22 continue to drive the inner side rotating gears 54 to rotate, and the inner side fixed racks 36 are located at the bottommost part so as to generate friction force on the inner side rotating gears 54, so that the inner rotating shaft 53 and the inner rotating gear 54 do not rotate together any more, so that the inner fixed rack 36 is always at the lowest position, the inner blocking template 19 continues to expand outwards, the incomplete gear 24 intermittently drives the transmission gear 26 to rotate, the incomplete gear 24 and the transmission gear 26 are meshed to rotate so that the transmission shaft 25 and the transmission bevel gear 27 rotate, the transmission bevel gear 27 drives the meshing bevel gear 29 to rotate, the meshing bevel gear 29 drives the bevel gear shaft 28 to rotate, the bevel gear shaft 28 drives the outer rotating shaft 50 to rotate through the linkage belt 30, the outer rotating shaft 50 drives all the outer rotating shafts 50 to rotate through the outer transmission belt 52, the outer rotating shafts 50 drive the corresponding outer rotating gears 51 to rotate, so that the corresponding meshed outer fixed racks 38 are driven, the outer blocking template 37 moves downwards, and the outer blocking template 37 just falls to the lowest position after the inner blocking template 19 moves to the outermost part, the outer side complementary template 37 and the inner blocking template 19 are just closed to form a ring, the inner diameter of the ring to be injected is changed, when the thickness of the ring to be injected needs to be changed, all the push telescopic rods 39 are started and shortened together to drive the outer blocking template 40 to move outwards, the outer blocking template 40 is stopped above the induction sensor 41 to generate mass, when the ring is positioned below the inner telescopic rods 44, the inner telescopic rods 44 are all extended to push the inner layer complementary template 45 to the bottommost end, so that the inner layer complementary template 45 and the outer blocking template 40 form a closed circle, when the ring is positioned below the outer telescopic rods 42, the outer telescopic rods 42 are all started to extend to push the outer layer complementary template 43 to the bottommost end, so that the outer layer complementary template 43 and the outer blocking template 40 form a closed circle, the purpose of changing the outer diameter of the ring is achieved, when the outer blocking template 40 moves outwards, the flow guide pipe 47 can be driven to move outwards, so that the lower part, the injection molding material can flow downwards along the wall of the outer blocking template 40 all the time, at the moment, the injection molding material is poured into the injection molding cavity 11 through the discharge port 48, and the injection molding material enters between the outer blocking template 40 and the inner blocking template 19 and the corresponding complementary mold parts along the guide pipe 47, so that the injection molding material can be molded into a required circular ring size, and the purpose of obtaining circular rings with different sizes is achieved.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.