CN115416208A

CN115416208A - Plastic injection molding equipment and method

Info

Publication number: CN115416208A
Application number: CN202211064419.4A
Authority: CN
Inventors: 陈晓鸿
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-08-31
Filing date: 2022-08-31
Publication date: 2022-12-02

Abstract

The invention belongs to the technical field of plastic injection molding equipment, and particularly discloses plastic injection molding equipment which comprises a support frame, wherein an air cylinder is fixedly arranged at the upper end of the support frame, an injection molding gun is fixedly connected to the lower end of an output shaft of the air cylinder, an upper module is fixedly connected to the lower end of the injection molding gun, plastic inlet pipes are respectively arranged at two ends of the injection molding gun, a jacking mechanism for automatically jacking a molded injection molding piece is arranged at the bottom of the inner side of the support frame, an auxiliary mechanism for assisting demoulding is arranged in the jacking mechanism, and a limiting mechanism for preventing bullet flying is arranged at the outer sides of the injection molding gun and the jacking mechanism. According to the invention, the auxiliary mechanism and the limiting mechanism are matched with the jacking mechanism for use, so that the auxiliary demoulding is effectively carried out through vibration in the demoulding process, the phenomenon that the injection moulded part is easy to damage due to large adhesive force after moulding is effectively reduced, and the injection moulded part is prevented from bouncing off.

Description

Plastic injection molding equipment and method

Technical Field

The invention belongs to the technical field of plastic injection molding equipment, and particularly discloses plastic injection molding equipment and a plastic injection molding method.

Background

The plastic is a high molecular compound obtained by polymerization of monomers through addition polymerization or condensation polymerization, has moderate deformation resistance, is between fiber and rubber, and consists of synthetic resin, filler, plasticizer, stabilizer, lubricant, pigment and other additives. The main component of the plastic is resin. The resin means a polymer compound which has not been mixed with various additives. The term resin is originally named as lipids secreted by animals and plants, such as rosin, shellac, and the like. The resin accounts for about 40-100% of the total weight of the plastic. The basic properties of plastics are largely determined by the nature of the resin, but additives also play an important role;

when the existing injection molding bowl manufacturing and forming equipment is used, the formed injection molding bowl is possibly strong in adhesion force in a cavity, and the traditional ejection mechanism is used for ejecting materials, so that the injection molding product is easy to deform or damage due to strong adhesion force, and the process is a continuous jacking process, so that when the injection molding is suddenly released, the product is easy to jack up and jump, the condition of falling can be caused, and the damage to the injection molding part can influence the quality of the finished product.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides plastic injection molding equipment and a method.

In order to achieve the above purpose, the invention provides plastic injection molding equipment, which comprises a support frame, wherein a cylinder is fixedly installed at the upper end of the support frame, an injection molding gun is fixedly connected to the lower end of an output shaft of the cylinder, an upper module is fixedly connected to the lower end of the injection molding gun, plastic inlet pipes are installed at two ends of the injection molding gun, a jacking mechanism for automatically jacking a molded injection molding piece is installed at the bottom of the inner side of the support frame, an auxiliary mechanism for assisting demoulding is arranged in the jacking mechanism, and a limiting mechanism for preventing bullet flying is installed at the outer sides of the injection molding gun and the jacking mechanism.

In the above technical scheme, preferably, the jacking mechanism includes a placing table fixedly welded at the bottom inside the support frame, a fixed cylinder is arranged inside the placing table, a lower module is fixedly connected to the upper end of the fixed cylinder, a jacking plate is arranged at the bottom of the inner side of the lower module, a lifting rod is fixedly connected to the lower end of the jacking plate, a sealing plate is fixedly connected to the lower side of the lifting rod close to the inside of the fixed cylinder, an air inlet pipe is fixedly mounted at the position, close to the sealing plate, of one side of the fixed cylinder, an air guide groove is formed in the inner wall of the fixed cylinder, and a guide opening is formed in the inner position, corresponding to the air guide groove, of the upper side of the air inlet pipe.

In the above technical scheme, preferably, the fixed cylinder and the lower module are of an integrated structure, the lifting rod penetrates through the inside of the fixed cylinder, the sealing plate is attached to the inner wall of the fixed cylinder, and the air inlet pipe is communicated with the inside of the fixed cylinder and the inside of the air guide groove.

In the above technical scheme, it is preferred, the complementary unit includes that fixed connection is at a plurality of groups installation section of thick bamboo of placing the inboard wall of platform, the inside swing joint of installation section of thick bamboo has the movable block, the first spring of fixedly connected with between one side inner wall of movable block and installation section of thick bamboo, the upper end fixedly connected with stationary blade of movable block, the connector has been seted up to the upside inside of stationary blade, the upside of installation section of thick bamboo is close to the position of stationary blade and has been seted up the opening, the inboard swing joint of connector has the adjustable shelf, the intermediate position swing joint of adjustable shelf has the pedestal, the upper end fixedly connected with of adjustable shelf strikes the piece, the outside of fixed section of thick bamboo is close to two sets of snap rings of upside position fixedly connected with, and is two sets of the equal swing joint in inside of snap ring has a plurality of groups ball, and is two sets of the outside cover of snap ring has the lantern ring, a plurality of groups of fixed block of outside fixedly connected with of the lantern ring, a plurality of groups play gas cylinder of outside fixedly connected with of lantern ring.

In the above technical scheme, it is preferred that one side of movable block is the cambered surface setting, the stationary blade runs through in the open-ended inside, the pedestal is fixed connection with the upside inner wall of placing the platform, strike the piece and set up for the slope.

In the above technical scheme, preferably, the lantern ring communicates with each other with the inside of air guide groove, the lantern ring is swing joint block with two sets of snap rings, one side cambered surface of fixed block sets up, the fixed block is laminated with the movable block, the gas outlet cylinder communicates with each other with the inside of lantern ring.

In the above technical scheme, preferably, stop gear includes the mount of fixed connection at the closing plate lower extreme, the equal fixedly connected with square pipe in side upper end around the mount, it is two sets of the both sides swing joint of square pipe has two sets of links, and is two sets of be close to the equal fixedly connected with second spring in square intraduct position between the front and back side of link, the fixedly connected with limiting plate between the upside of link, the equal fixedly connected with of the front and back end of the rifle of moulding plastics opens the frame, the position that the side is close to the mount around placing the platform has all seted up the spout.

In the above technical solution, preferably, the fixing frame is located inside the sliding groove, the fixing frame is U-shaped, and the lower side of the connecting frame is located inside the square tube.

In the above technical scheme, preferably, the limiting plate is located at the upper end of the lower module, the lower side of the opening frame is trapezoidal, and the lower side of the opening frame is located between the two groups of connecting frames.

There is also provided a method of using a plastic injection molding apparatus for operating a plastic injection molding apparatus, comprising the steps of:

s1: starting an air pump, respectively introducing air into the fixed cylinder and the air guide groove through an air inlet pipe and a guide port, so that the sealing plate is connected with the lifting rod and the jacking plate and respectively pushed upwards, and the injection molding piece formed in the lower mold block can be jacked up through the jacking plate, thereby realizing the purpose of automatic demolding;

s2: the air outlet cylinders are arranged to discharge air, the lantern ring is pushed to rotate, the fixed block pushes the movable block to compress the first spring, the knocking block and the lower module are driven to knock along the rotation of the shaft bracket, the generated vibration reduces the adhesive force between the knocking block and the lower module, and the demolding is easier;

s3: through the closing plate laminating in the upside of injection molding, the removal of jacking board, lifter simultaneously thereupon and remove, play spacing effect to the injection molding, avoid resulting in the injection molding to bounce suddenly, lead to the possibility that drops.

Compared with the prior art, the invention has the following beneficial effects:

1. need be with two sets of plastic pipes that advance, the intake pipe is connected and the air pump is connected with the injection molding machine respectively, the cooperation starts the cylinder and promotes the rifle of moulding plastics, go up the module and get into down in the module, mould plastics, when the deciduate is carried out after the later stage shaping, need start the air pump, through the intake pipe, the uide port is respectively to the solid fixed cylinder, the inside of air guide groove is admitted air, make closing plate and lifter, the connection of jacking board, upwards promoted respectively, can jack-up the injection molding behind the lower module internal forming through the jacking board, realize the purpose of automatic deciduate.

2. When the injection molding is stronger with the adhesive force of lower module, the accessible direction mouth, the cooperation in air guide groove is used, admit air to the inside of the lantern ring, go out of a plurality of groups's play gas cylinder setting, gas is followed going out of a gas cylinder, and the play gas cylinder sets up for the slope, so can promote the lantern ring to rotate along two sets of snap rings when giving vent to anger, and the setting of a plurality of groups ball alleviates frictional force between the two, it is rotatory to drive a plurality of groups fixed block simultaneously, and the rotation of fixed block can be with the movable block contact, because of contact surface between them is the cambered surface, so can promote the movable block and compress first spring, it is rotatory along the pedestal to drive fixed connection's stationary blade promotion movable frame simultaneously, the piece that strikes of messenger's upside strikes the module down, the injection molding after the shaping forms the vibration in the module down, reduce its and adhesive force, it is easier to have realized the drawing of patterns, and the purpose that the injection molding product is difficult for appearing damaging even.

3. When the closing plate rises, drive the mount, square pipe, the link, the second spring, the limiting plate upwards rises, the laminating is at the upside of injection molding, thereupon the jacking board, the removal of lifter removes, play spacing effect to the injection molding, can not be because of the adhesive force when great, the jacking that lasts of jacking board, lead to the injection molding to bounce suddenly, lead to the possibility that drops, and in last module decline, through the setting of two sets of opening frames, promote two sets of links separately, tensile second spring, avoid sheltering from the cope match-plate pattern.

Drawings

FIG. 1 is a schematic structural view of a plastic injection molding apparatus according to the present invention;

FIG. 2 is a schematic view of a sectional structure of a plastic injection molding apparatus according to the present invention;

FIG. 3 is a schematic structural view of a jacking mechanism of a plastic injection molding apparatus according to the present invention;

FIG. 4 is an enlarged schematic view of part A of a plastic injection molding apparatus according to the present invention;

FIG. 5 is an enlarged schematic view of a part B of a plastic injection molding apparatus according to the present invention;

FIG. 6 is a schematic view of a partially cut-away structure of an auxiliary mechanism of a plastic injection molding apparatus according to the present invention;

fig. 7 is a schematic view of a partially cut-away structure of a limiting mechanism of a plastic injection molding device according to the present invention.

In the figure: 1. a support frame; 2. a cylinder; 3. an injection molding gun; 4. an upper module; 5. feeding a plastic pipe; 6. a jacking mechanism; 61. a placing table; 62. a fixed cylinder; 63. a lower module; 64. a jacking plate; 65. a lifting rod; 66. a sealing plate; 67. an air inlet pipe; 68. a gas guide groove; 69. a guide port; 7. an auxiliary mechanism; 71. mounting the cylinder; 72. a movable block; 73. a first spring; 74. a fixing sheet; 75. a connection port; 76. an opening; 77. a movable frame; 78. a pedestal; 79. knocking the block; 710. a snap ring; 711. a ball bearing; 712. a collar; 713. a fixed block; 714. an air outlet cylinder; 8. a limiting mechanism; 81. a fixed mount; 82. a square tube; 83. a connecting frame; 84. a second spring; 85. a limiting plate; 86. opening the frame; 87. a chute.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and thus the present invention is not limited to the specific embodiments disclosed below.

The plastic injection molding equipment shown in fig. 1-7 comprises a support frame 1, a cylinder 2 is fixedly mounted at the upper end of the support frame 1, an injection molding gun 3 is fixedly connected to the lower end of an output shaft of the cylinder 2, an upper module 4 is fixedly connected to the lower end of the injection molding gun 3, plastic inlet pipes 5 are mounted at two ends of the injection molding gun 3, a jacking mechanism 6 for automatically jacking a molded injection molding part is mounted at the bottom of the inner side of the support frame 1, an auxiliary mechanism 7 for assisting demoulding is arranged inside the jacking mechanism 6, and a limiting mechanism 8 for preventing bullet flying is mounted outside the injection molding gun 3 and the jacking mechanism 6.

The jacking mechanism 6 comprises a placing table 61 fixedly welded at the bottom inside the support frame 1, a fixed cylinder 62 is arranged inside the placing table 61, a lower module 63 fixedly connected with the upper end of the fixed cylinder 62, a jacking plate 64 is arranged at the bottom inside the lower module 63, a lifting rod 65 is fixedly connected with the lower end of the jacking plate 64, a sealing plate 66 fixedly connected with the inside of the fixed cylinder 62 is close to the lower side of the lifting rod 65, an air inlet pipe 67 is fixedly installed at the position, close to the sealing plate 66, of one side of the fixed cylinder 62, an air guide groove 68 is arranged in the inner wall of the fixed cylinder 62, a guide port 69 is formed in the inner position, corresponding to the air guide groove 68, of the upper side of the air inlet pipe 67, the fixed cylinder 62 and the lower module 63 are of an integrated structure, the lifting rod 65 penetrates through the inside of the fixed cylinder 62, the sealing plate 66 is attached to the inner wall of the fixed cylinder 62, the air inlet pipe 67 is communicated with the fixed cylinder 62 and the inside of the air guide groove 68.

Need be with two sets of plastic pipe 5 that advance, intake pipe 67 is connected and the air pump is connected with the injection molding machine respectively, the cooperation starts cylinder 2 and promotes rifle 3 of moulding plastics, go up module 4 and get into down in the module 63, mould plastics, when the deciduate is carried out after the later stage shaping, need start the air pump, through intake pipe 67, guiding port 69 is respectively to the solid fixed cylinder 62, the inside of air guide groove 68 is admitted air, make closing plate 66 and lifter 65, the connection of jacking board 64, upwards promoted respectively, can be with the injection molding jack-up after the module 63 inside shaping through jacking board 64, realize the purpose of automatic deciduate.

The auxiliary mechanism 7 comprises a plurality of groups of mounting cylinders 71 fixedly connected with the inner wall of the upper side of the placing table 61, a movable block 72 is movably connected inside the mounting cylinder 71, a first spring 73 is fixedly connected between the movable block 72 and the inner wall of one side of the mounting cylinder 71, a fixed plate 74 is fixedly connected with the upper end of the movable block 72, a connecting port 75 is arranged inside the upper side of the fixed plate 74, an opening 76 is arranged at the position, close to the fixed plate 74, on the upper side of the mounting cylinder 71, a movable frame 77 is movably connected with the inner side of the connecting port 75, a shaft frame 78 is movably connected at the middle position of the movable frame 77, a knocking block 79 is fixedly connected at the upper end of the movable frame 77, two groups of snap rings 710 are fixedly connected at the position, close to the upper side, on the outer side of the fixed cylinder 62, the inside of two sets of snap rings 710 all swing joint has a plurality of groups ball 711, the outside cover of two sets of snap rings 710 has the lantern ring 712, the outside fixedly connected with a plurality of groups fixed block 713 of lantern ring 712, the outside fixedly connected with a plurality of groups play chimney 714 of lantern ring 712, one side of movable block 72 is the cambered surface setting, the stationary blade 74 runs through in the inside of opening 76, pedestal 78 is fixed connection with the upside inner wall of placing platform 61, it sets up for the slope to strike the piece 79, the lantern ring 712 communicates with each other with the inside of leading the gas groove 68, the lantern ring 712 is the swing joint block with two sets of snap rings 710, one side cambered surface setting of fixed block 713, fixed block 713 and the laminating of movable block 72, the inside of play chimney 714 and lantern ring 712 communicates with each other.

When the adhesion force between the injection molding part and the lower module 63 is strong, the injection molding part can be used through the matching of the guide port 69 and the air guide groove 68, air is supplied to the inside of the lantern ring 712, the air is discharged from the air outlet cylinders 714 of a plurality of groups, the air outlet cylinders 714 are obliquely arranged, the lantern ring 712 can be pushed to rotate along the two groups of clamping rings 710 while air is discharged, the balls 711 of a plurality of groups are arranged to reduce the friction force between the balls and the clamping rings, the fixing blocks 713 are driven to rotate at the same time, the fixing blocks 713 can be rotated to be in contact with the movable blocks 72, and the contact surfaces of the fixing blocks 713 and the movable blocks 72 are cambered surfaces, so that the movable blocks 72 can be pushed to compress the first spring 73, the fixing plates 74 fixedly connected are driven to push the movable frames 77 to rotate along the shaft frames 78, the knocking blocks 79 on the upper side can knock the lower module 63, the formed injection molding part can form vibration in the lower module 63, the adhesion force between the injection molding part and the injection molding part can be reduced, and the injection molding part can be easily demolded.

Stop gear 8 includes fixed connection at the mount 81 of closing plate 66 lower extreme, the equal fixedly connected with square pipe 82 in side upper end around mount 81, the both sides swing joint of two sets of square pipe 82 has two sets of links 83, be close to the equal fixedly connected with second spring 84 in square pipe 82 internal position between the front and back side of two sets of links 83, fixedly connected with limiting plate 85 between the upside of link 83, the equal fixedly connected with in front and back end of the rifle 3 of moulding plastics opens frame 86, spout 87 has all been seted up to the position that the front and back side of placing platform 61 is close to mount 81, mount 81 is located the inside of spout 87, the shape of mount 81 is the U font, the downside of link 83 is located the inside of square pipe 82, limiting plate 85 is located the upper end position of lower module 63, the downside that opens frame 86 is trapezoidal, it is located between two sets of links 83 to open frame 86 downside.

When closing plate 66 rises, drive mount 81, square pipe 82, link 83, second spring 84, limiting plate 85 upwards rises, the laminating is at the upside of injection molding, jacking board 64 thereupon, lifter 65's removal removes, play spacing effect to the injection molding, can not be because of the adhesive force when great, the jacking of the continuation of jacking board 64, lead to the injection molding to bounce suddenly, lead to the possibility that drops, and in the time of last module 4 descends, through two sets of settings that open frame 86, promote two sets of links 83 separately, tensile second spring 84, avoid sheltering from last module 4.

s1: starting an air pump, respectively introducing air into the fixed cylinder 62 and the air guide groove 68 through an air inlet pipe 67 and a guide port 69, so that the sealing plate 66 is connected with the lifting rod 65 and the jacking plate 64 and is respectively pushed upwards, and the injection molding piece molded in the lower module 63 can be jacked up through the jacking plate 64, thereby achieving the purpose of automatic demoulding;

s2: a plurality of groups of air outlet cylinders 714 are arranged to discharge air, the lantern ring 712 is pushed to rotate, the fixed block 713 pushes the movable block 72 to compress the first spring 73, the knocking block 79 and the lower module 63 are driven to knock along the rotation of the shaft bracket 78, the generated vibration reduces the adhesive force between the knocking block 79 and the lower module, and the demolding is easier;

s3: through the laminating of closing plate 66 in the upside of injection molding, simultaneously along with the removal of jacking board 64, lifter 65 and remove, play spacing effect to the injection molding, avoid resulting in the injection molding to bounce suddenly, lead to the possibility that drops.

The working principle is as follows: during the use, need be connected two sets of plastic pipe 5, intake pipe 67 of advancing with the injection molding machine respectively and the air pump is connected, and the cooperation starts the cylinder (the model is: MGPM 25-20Z) 2 pushes the injection molding gun 3 and the upper module 4 to enter the lower module 63 for injection molding, when demoulding is carried out after later molding, an air pump needs to be started, air is respectively fed into the fixed cylinder 62 and the air guide groove 68 through the air inlet pipe 67 and the guide port 69, so that the sealing plate 66 is connected with the lifting rod 65 and the jacking plate 64 and is respectively pushed upwards, an injection molded part formed in the lower module 63 can be jacked up through the jacking plate 64, the purpose of automatic demoulding is realized, in addition, when the adhesion force of the injection molded part and the lower module 63 is stronger, air can be fed into the inner part of the lantern ring 712 through the matching of the guide port 69 and the air guide groove 68, air is discharged from the air outlet cylinder 714 through a plurality of groups of air outlet cylinders 714, and the air outlet cylinder 714 is arranged obliquely, so can promote the lantern ring 712 to rotate along two sets of snap rings 710 when giving vent to anger, and the setting of a plurality of groups ball 711 alleviates frictional force between the two, it is rotatory to drive a plurality of fixed blocks 713 simultaneously, and the rotation of fixed block 713 can contact with movable block 72, because of the contact surface between them is the cambered surface, so can promote movable block 72 to compress first spring 73, it promotes fixed sheet 74 of fixed connection simultaneously and promotes movable frame 77 to rotate along pedestal 78, make upside strike piece 79 strike lower module 63, the vibrations that produce make the injection molding form the vibration in lower module 63 after the shaping, reduce its adhesive force with, it is easier to realize the drawing of patterns, and injection molding product is difficult for appearing deformation or even damage's purpose, at last when closing plate 66 rises, drive mount 81, square pipe 82, link 83, second spring 84, limiting plate 85 upwards rises, the laminating is at the upside of injection molding, jacking board 64 thereupon, lifter 65's removal and removal, play spacing effect to the injection molding, can not be because of adhesive force when great, the jacking of jacking board 64's continuation, lead to the injection molding to bounce suddenly, lead to the possibility that drops, and in the time of last module 4 descends, through the setting of two sets of opening frame 86, it separately to promote two sets of links 83, tensile second spring 84, avoid sheltering from last module 4.

In the present invention, the terms "mounting," "connecting," "fixing," and the like are used in a broad sense, for example, "connecting" may be a fixed connection, a detachable connection, or an integral connection; may be connected with each other or indirectly connected with each other through an intermediate medium. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the description herein, the appearances of the phrases "one embodiment," "some embodiments," "a specific embodiment," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment or example, but rather to the same embodiment or example. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a plastics injection moulding equipment, includes support frame (1), its characterized in that, the upper end fixed mounting of support frame (1) has cylinder (2), output shaft lower extreme fixedly connected with of cylinder (2) moulds plastics rifle (3), mould plastics the lower extreme fixedly connected with of rifle (3) and go up module (4), mould plastics the both ends of rifle (3) and all install into and mould tub (5), climbing mechanism (6) with the automatic jack-up of fashioned injection molding are installed to the inboard bottom of support frame (1), the inside of climbing mechanism (6) is provided with supplementary complementary unit (7) of demoulding, the stop gear (8) that prevent to play are installed in the outside of rifle (3) of moulding plastics and climbing mechanism (6).

2. The plastic injection molding device according to claim 1, wherein the jacking mechanism (6) comprises a placing table (61) fixedly welded at the inner bottom of the support frame (1), a fixed cylinder (62) is arranged inside the placing table (61), a lower module (63) is fixedly connected to the upper end of the fixed cylinder (62), a jacking plate (64) is arranged at the inner bottom of the lower module (63), a lifting rod (65) is fixedly connected to the lower end of the jacking plate (64), a sealing plate (66) is fixedly connected to the lower side of the lifting rod (65) close to the inner part of the fixed cylinder (62), an air inlet pipe (67) is fixedly installed at a position, close to the lower side of the sealing plate (66), of one side of the fixed cylinder (62), an air guide groove (68) is arranged in the inner wall of the fixed cylinder (62), and a guide opening (69) is formed at the inner position, corresponding to the air guide groove (68), of the upper side of the air inlet pipe (67).

3. The plastic injection molding device as claimed in claim 2, wherein the fixed cylinder (62) and the lower module (63) are of an integral structure, the lifting rod (65) penetrates through the inside of the fixed cylinder (62), the sealing plate (66) is attached to the inner wall of the fixed cylinder (62), and the air inlet pipe (67) is communicated with the insides of the fixed cylinder (62) and the air guide groove (68).

4. A plastic injection molding apparatus as claimed in claim 2, wherein the auxiliary mechanism (7) includes a plurality of sets of mounting cylinders (71) fixedly attached to an upper inner wall of the placing table (61), the inner part of the mounting cylinder (71) is movably connected with a movable block (72), a first spring (73) is fixedly connected between the movable block (72) and the inner wall of one side of the mounting cylinder (71), the upper end of the movable block (72) is fixedly connected with a fixed plate (74), a connecting port (75) is arranged inside the upper side of the fixing piece (74), an opening (76) is arranged at the upper side of the mounting tube (71) close to the position of the fixing sheet (74), the inner side of the connecting port (75) is movably connected with a movable frame (77), the middle position of the movable frame (77) is movably connected with a shaft frame (78), the upper end of the movable frame (77) is fixedly connected with a knocking block (79), two groups of snap rings (710) are fixedly connected at the outer side of the fixed cylinder (62) close to the upper side, a plurality of groups of balls (711) are movably connected inside the two groups of snap rings (710), a lantern ring (712) is sleeved at the outer side of the two groups of snap rings (710), the outer side of the lantern ring (712) is fixedly connected with a plurality of groups of fixing blocks (713), the outer side of the lantern ring (712) is fixedly connected with a plurality of groups of air outlet cylinders (714).

5. A plastic injection moulding apparatus as claimed in claim 4, wherein one side of said movable block (72) is provided with an arc surface, said stationary plate (74) penetrates inside the opening (76), said pedestal (78) is fixedly connected with the upper inner wall of the placing table (61), and said knocking block (79) is provided with an inclination.

6. A plastic injection molding apparatus as claimed in claim 4, wherein the collar (712) communicates with the interior of the air guide groove (68), the collar (712) is movably connected and engaged with two sets of snap rings (710), one side of the fixed block (713) is provided with an arc surface, the fixed block (713) is attached to the movable block (72), and the air outlet tube (714) communicates with the interior of the collar (712).

7. The plastic injection molding equipment according to claim 2, wherein the limiting mechanism (8) comprises a fixed frame (81) fixedly connected to the lower end of the sealing plate (66), square pipes (82) are fixedly connected to the upper ends of the front and rear sides of the fixed frame (81), two groups of connecting frames (83) are movably connected to the two sides of the square pipes (82), second springs (84) are fixedly connected to the positions, close to the inner portions of the square pipes (82), between the front and rear sides of the two groups of connecting frames (83), limiting plates (85) are fixedly connected to the upper sides of the connecting frames (83), opening frames (86) are fixedly connected to the front and rear ends of the injection molding gun (3), and sliding grooves (87) are formed in the positions, close to the fixed frame (81), of the front and rear sides of the placing table (61).

8. A plastic injection molding apparatus as claimed in claim 7, wherein said holder (81) is located inside a chute (87), said holder (81) is U-shaped, and the underside of said connecting frame (83) is located inside a square tube (82).

9. A plastic injection molding apparatus as claimed in claim 7, wherein the limiting plate (85) is located at an upper end of the lower mold block (63), the underside of the expandable frame (86) is trapezoidal, and the underside of the expandable frame (86) is located between the two sets of connecting frames (83).

10. A method of using an injection molding apparatus for operating a plastic injection molding apparatus as claimed in any one of claims 1 to 9, comprising the steps of:

s1: starting an air pump, and respectively introducing air into the fixed cylinder (62) and the air guide groove (68) through an air inlet pipe (67) and a guide port (69), so that a sealing plate (66) is connected with a lifting rod (65) and a jacking plate (64) and respectively pushed upwards, and an injection molding piece formed in the lower module (63) can be jacked up through the jacking plate (64), thereby realizing the purpose of automatic demoulding;

s2: a plurality of groups of air outlet cylinders (714) are arranged to discharge air, the lantern ring (712) is pushed to rotate, the fixed block (713) pushes the movable block (72) to compress the first spring (73), the knocking block (79) and the lower module (63) are driven to rotate along the shaft bracket (78) to knock, the generated vibration reduces the adhesive force between the knocking block and the lower module, and the demolding is easier;

s3: the sealing plate (66) is attached to the upper side of the injection molding part and moves along with the movement of the jacking plate (64) and the lifting rod (65), so that the injection molding part is limited, and the possibility of falling caused by sudden bounce of the injection molding part is avoided.