CN114179313A

CN114179313A - Injection mold is used in production of plastics gear

Info

Publication number: CN114179313A
Application number: CN202210006983.4A
Authority: CN
Inventors: 高彩云
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-01-05
Filing date: 2022-01-05
Publication date: 2022-03-15

Abstract

The invention discloses an injection mold for producing a plastic gear, and relates to the technical field of injection molding. This injection mold is used in plastics gear production includes the lower mould, the top of lower mould is provided with the upper mould, the groove of moulding plastics has been seted up at the top of lower mould. This injection mold is used in plastics gear production, when the plastics to the inside increase high temperature in groove of moulding plastics, change through the mould temperature can make inside gas expansion of sealing frame and shrink, thereby can drive piston and fixed axle and remove, can drive the rotating ring through the epaxial spiral spout of fixed axle and rotate, make swing board and lug strike the bottom in groove of moulding plastics and make it produce the vibration, can eliminate air and the bubble of being melted in the plastics, temperature reduces swing board and lug and still can strike the groove of moulding plastics after the plastic molding, thereby can avoid the adhesion behind the plastic molding can't break away from inside the mould, make the quality and the speed of plastic molding improve.

Description

Injection mold is used in production of plastics gear

Technical Field

The invention relates to the technical field of injection molding, in particular to an injection mold for producing a plastic gear.

Background

Injection molding, also known as injection molding, is a method of molding by injection and molding. The injection molding method has the advantages of high production speed, high efficiency, automation of operation, various colors, various shapes from simple to complex, small sizes, accurate product size, easy replacement of products, capability of forming products with complex shapes, and suitability for the molding processing fields of mass production, products with complex shapes and the like.

When the existing injection mold is used for molding, melted plastic is poured into the mold for cooling and molding, when the melted plastic enters the mold, air and bubbles can exist in the melted plastic, and certain adhesion effect can be generated between the molds by the molded plastic, so that the molding speed and quality of the plastic can be influenced.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides an injection mold for producing a plastic gear, which solves the problems in the background technology.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme: an injection mold for producing plastic gears comprises a lower mold, wherein an upper mold is arranged at the top of the lower mold, an injection molding groove is formed in the top of the lower mold, a sealing frame is fixedly installed at the bottom of the inner wall of the lower mold, a piston is slidably installed on the inner wall of the sealing frame, a fixed shaft is fixedly installed at the top of the piston, a rotating ring is rotatably installed on the inner wall of the top of the lower mold, a fixed rod is fixedly installed at the bottom of the rotating ring, a sliding rod is fixedly installed at the bottom of the fixed rod, a spiral sliding groove is formed in the outer wall of the fixed shaft, the sliding rod is slidably installed in the spiral sliding groove, a swinging plate is rotatably installed on the inner wall of the rotating ring, protruding blocks are fixedly installed on the left side and the right side of the swinging plate, and the swinging plate is elastically connected with the inner wall of the rotating ring through a first elastic sheet,

preferably, the bottom of the injection molding groove is fixedly provided with a driving device, the output end of the driving device is fixedly provided with a rectangular elastic telescopic rod, the bottom free end of the rectangular elastic telescopic rod is fixedly provided with a fan plate, the top of the fan plate is fixedly provided with a friction plate, and the friction plate is in contact with the bottom of the injection molding groove.

Preferably, the top of bed die rotates installs the arc scraper blade, the arc scraper blade is provided with two, and two arc scraper blades pass through No. two shell fragment elastic connection, the top slidable mounting of bed die has triangle-shaped to promote the piece, triangle-shaped promotes the face contact that is close to of piece and two arc scraper blades.

Preferably, the bottom fixed mounting who goes up the mould has the locating lever, the bottom of going up the mould is seted up with arc scraper blade and triangle-shaped promotes piece assorted recess, the fixed cover of wall has connect a location section of thick bamboo in the top of bed die, triangle-shaped promotes the piece and runs through the top of a location section of thick bamboo and triangle-shaped promotes piece slidable mounting on a location section of thick bamboo.

Preferably, the right side of a location section of thick bamboo has seted up the spout, slidable mounting has the pressure movable plate on the inner wall of spout, the pressure movable plate is through No. three shell fragments and spout elastic connection, the fixed slot has been seted up to the bottom of pressure movable plate, rotate on the inner wall of fixed recess and install the gyro wheel, the dead lever runs through annular slab and annular slab slidable mounting on the dead lever, the annular slab is through No. four shell fragments and dead lever elastic connection, the inner wall of annular slab is fixed with the one end of connecting rod, the other end of connecting rod rotates with the left and right sides end bottom of rectangle elasticity telescopic link and is connected.

Preferably, a cavity is formed in the rotating ring, the connecting rod is rotatably mounted at the top of the inner wall of the cavity, the swinging block is fixedly mounted at the bottom of the driving connecting rod, the elastic air bag is fixedly mounted at the bottom of the cavity, and the communicated air outlet is formed in the bottom of the elastic air bag and the bottom of the rotating ring.

Preferably, fixed mounting has the fixed plate on the inner wall of cavity, rotate on the interior outer wall of swing piece and install the slurcam, the outside fixed mounting that the slurcam is located swing piece has the elastic plate, the one end fixed mounting that the slurcam was kept away from to the elastic plate has the piece of striking, the right side fixed mounting of swing piece has the collision piece, strike piece and collision piece contact.

Preferably, fixed mounting has elastic telescopic rod on the inner wall of swing piece, the bottom fixed mounting of elastic telescopic rod free end has the gravity piece, fixed mounting has the screens board about the elastic telescopic rod on the end.

(III) advantageous effects

The invention provides an injection mold for producing a plastic gear. The method has the following beneficial effects:

(1) this injection mold is used in plastics gear production, when the plastics to the inside increase high temperature in groove of moulding plastics, change through the mould temperature can make inside gas expansion of sealing frame and shrink, thereby can drive piston and fixed axle and remove, can drive the rotating ring through the spiral spout on the fixed axle and rotate, make swing board and lug strike the bottom in groove of moulding plastics and make it produce the vibration, can eliminate air and the bubble of being melted in the plastics, temperature reduces swing board and lug and still can strike the groove of moulding plastics after the plastic forming, thereby can avoid behind the plastic forming adhesion can't break away from in the mould is inside, make plastic forming's quality and speed improve.

(2) This injection mold is used in production of plastic gear, before moulding plastics, drive arrangement can drive fan board and friction plate and rotate, makes the friction plate can rub with the bottom in the groove of moulding plastics and produce the heat, can improve the temperature of the inslot portion of moulding plastics, avoids direct solidification behind plastics and the microthermal mould contact of high temperature, leads to the incomplete appearance of shape after the plastic molding to influence the quality of plastics production.

(3) This injection mold is used in production of plastics gear, when last mould moves down, a locating lever and a location section of thick bamboo can fix a position last mould, and when the locating lever got into the inside of a location section of thick bamboo, triangle-shaped promoted the piece and can promote arc scraper blade looks back of the body and rotate, made the arc scraper blade clear up the top of bed die, avoided the dust on the bed die to get into the inside of moulding plastics groove and influence the injection moulding's of plastics quality

(4) This injection mold is used in plastics gear production, when the locating lever inserts the location section of thick bamboo completely, the locating lever can promote the pressure plate downstream, gyro wheel on the pressure plate can promote the annular slab downstream, the annular slab passes through the connecting rod and can drive the free end downstream of rectangle elasticity telescopic link, thereby rectangle elasticity telescopic link can drive fan board and friction plate downstream, make the friction plate break away from with the groove of moulding plastics, rotate through the fan board and can accelerate the inside air flow of lower mould, thereby can accelerate the cooling of lower mould and the inslot portion of moulding plastics, improve injection moulding's efficiency.

(5) The injection mold for producing the plastic gear can drive the swing block to swing inside the rotating ring when the rotating ring rotates, the swing block can swing to extrude the elastic airbag, so that gas inside the elastic airbag is discharged from the gas outlet, the gas flowing and cooling speed inside the lower mold can be further accelerated, the push plate can be pushed to rotate when the swing block can fix a plate, the knocking block can move on the collision block, the knocking block can knock the collision block and the swing block, the rotating ring and the lower mold can vibrate, the clamping plate can be pushed to move when the push plate rotates, the free end of the elastic telescopic rod can extend upwards, when the clamping plate cannot be moved by the push plate, the gravity block can move downwards quickly, so that the swinging force of the swing block can be improved, and the extruding force of the elastic airbag can be increased, the elastic air bag can discharge excessive quantity, and the vibration of the lower die can improve the efficiency of plastic separation.

Drawings

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

FIG. 2 is a schematic view of the structure of part A of FIG. 1 according to the present invention;

FIG. 3 is a schematic view of the internal structure of the lower mold of the present invention;

FIG. 4 is a schematic view of a rotating ring according to the present invention;

FIG. 5 is a perspective view of the interior of the lower mold of the present invention;

FIG. 6 is an enlarged view of the portion B of FIG. 5 according to the present invention;

FIG. 7 is a schematic view of the internal structure of the rotating ring of the present invention;

FIG. 8 is a schematic diagram of a wobble block configuration of the present invention;

fig. 9 is a schematic view of the internal structure of the sealing frame according to the present invention.

In the figure: 1. a lower die; 2. an upper die; 31. a sealing frame; 32. a piston; 33. a fixed shaft; 34. a rotating ring; 35. fixing the rod; 36. a slide bar; 37. a swing plate; 38. a bump; 41. a drive device; 42. a rectangular elastic telescopic rod; 43. a fan plate; 44. a friction plate; 51. an arc-shaped scraper plate; 52. a positioning cylinder; 53. a triangular pushing block; 54. positioning a rod; 61. pressing the movable plate; 62. a roller; 63. an annular plate; 64. a connecting rod; 71. a connecting rod; 72. a swing block; 73. an elastic air bag; 74. a fixing plate; 81. a push plate; 82. an elastic plate; 83. knocking the block; 84. a collision mass; 91. an elastic telescopic rod; 92. a gravity block; 93. screens board.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-9, the present invention provides a technical solution: an injection mold for producing plastic gears comprises a lower mold 1, an upper mold 2 is arranged at the top of the lower mold 1, an injection molding groove is formed at the top of the lower mold 1, a sealing frame 31 is fixedly arranged at the bottom of the inner wall of the lower mold 1, carbon dioxide gas is arranged inside the sealing frame 31, a piston 32 is slidably arranged on the inner wall of the sealing frame 31, a fixed shaft 33 is fixedly arranged at the top of the piston 32, a rotating ring 34 is rotatably arranged on the inner wall of the top of the lower mold 1, a fixed rod 35 is fixedly arranged at the bottom of the rotating ring 34, a sliding rod 36 is fixedly arranged at the bottom of the fixed rod 35, a spiral sliding groove is formed in the outer wall of the fixed shaft 33, the sliding rod 36 is slidably arranged inside the spiral sliding groove, a swinging plate 37 is rotatably arranged on the inner wall of the rotating ring 34, convex blocks 38 are fixedly arranged at the left side and the right side of the swinging plate 37, and the swinging plate 37 is elastically connected with the inner wall of the rotating ring 34 through a number one elastic sheet, when the inside in groove of moulding plastics increases the plastics of high temperature, the temperature of the inside of mould 1 can rise downwards, make the inside gas expansion of sealing frame 31 can promote piston 32 and fixed axle 33 and upwards move, make the arc spout can promote slide bar 36 and swivel becket 34 and rotate, swivel becket 34 can drive swinging plate 37 and rotate, swinging plate 37 and lug 38 can be strikeed the bottom in groove of moulding plastics, can eliminate air and bubble in being melted plastics, temperature reduction swinging plate 37 and lug 38 still can be strikeed the groove of moulding plastics after the plastic molding, thereby can avoid behind the plastic molding adhesion can't break away from in the mould inside, make the fashioned quality of plastics and speed improve.

The bottom of the injection molding groove is fixedly provided with a driving device 41, the output end of the driving device 41 is fixedly provided with a rectangular elastic telescopic rod 42, the free end of the bottom of the rectangular elastic telescopic rod 42 is fixedly provided with a fan plate 43, the top of the fan plate 43 is fixedly provided with a friction plate 44, the friction plate 44 is contacted with the bottom of the injection molding groove, the driving device 41 can drive the rectangular elastic telescopic rod 42 and the fan plate 43 to rotate, the fan plate 43 can drive the friction plate 44 to rotate, the friction plate 44 rubs at the bottom of the injection molding groove, the heat generated by the friction can be transferred to the inside of the injection molding groove, the temperature inside the injection molding groove can be increased, the direct contact between high-temperature plastic and a low-temperature mold is avoided, the solidification shape after the plastic molding is incomplete, and the quality of the plastic production is influenced,

a positioning rod 54 is fixedly installed at the bottom of the upper die 2, a groove matched with the arc-shaped scraper 51 and the triangular pushing block 53 is formed in the bottom of the upper die 2, a positioning cylinder 52 is fixedly sleeved on the inner and outer walls of the top of the lower die 1, the triangular pushing block 53 penetrates through the top of the positioning cylinder 52 and is slidably installed on the positioning cylinder 52, a sliding groove is formed in the right side of the positioning cylinder 52, a pressing plate 61 is slidably installed on the inner wall of the sliding groove, the pressing plate 61 is elastically connected with the sliding groove through a third elastic sheet, a fixing groove is formed in the bottom of the pressing plate 61, a roller 62 is rotatably installed on the inner wall of the fixing groove, the fixing rod 35 penetrates through an annular plate 63 and the annular plate 63 is slidably installed on the fixing rod 35, the annular plate 63 is elastically connected with the fixing rod 35 through a fourth elastic sheet, the inner wall of the annular plate 63 is fixed with one end of a connecting rod 64, and the other end of the connecting rod 64 is rotatably connected with the bottoms of the left end and the right end of the rectangular elastic telescopic rod 42, when the upper mold 2 moves downwards, the positioning rod 54 can be inserted into the positioning cylinder 52, the positioning rod 54 can push the triangular pushing block 53 to move, the triangular pushing block 53 can push the arc-shaped scraper blade 51 to rotate back to back, so that the arc-shaped scraper blade 51 can clean the top of the lower mold 1, dust on the lower mold 1 is prevented from entering the inside of the injection molding groove to influence the injection molding of plastics, the positioning rod 54 can push the pressing plate 61 to move downwards when completely entering the inside of the positioning cylinder 52, the pressing plate 61 moves downwards to enable the roller 62 to push the annular plate 63 to move downwards, the annular plate 63 moves downwards to drive the free end of the rectangular elastic telescopic rod 42 to move downwards through the transmission of the connecting rod 64, the friction plate 44 is separated from the bottom of the injection molding groove, the flow of gas inside the lower mold 1 can be accelerated when the sector 43 rotates, and the cooling of the lower mold 1 and the inside of the injection molding groove can be accelerated, the efficiency of injection moulding is improved.

The inside of the rotating ring 34 is provided with a cavity, the top of the inner wall of the cavity is rotatably provided with a connecting rod 71, the bottom of the connecting rod 71 is driven to be fixedly provided with a swinging block 72, the bottom of the cavity is fixedly provided with an elastic air bag 73, the bottom of the elastic air bag 73 and the bottom of the rotating ring 34 are provided with communicated air outlets, the inner wall of the cavity is fixedly provided with a fixed plate 74, the inner wall and the outer wall of the swinging block 72 are rotatably provided with a pushing plate 81, the pushing plate 81 is positioned at the outer side of the swinging block 72 and fixedly provided with an elastic plate 82, one end of the elastic plate 82 far away from the pushing plate 81 is fixedly provided with a knocking block 83, the right side of the swinging block 72 is fixedly provided with a collision block 84, the knocking block 83 is contacted with the collision block 84, the inner wall of the swinging block 72 is fixedly provided with an elastic telescopic rod 91, the bottom of the free end of the elastic telescopic rod 91 is fixedly provided with a gravity block 92, the left end and the right end of the elastic telescopic rod 91 are fixedly provided with clamping plates 93, when the rotating ring 34 rotates, the swinging block 72 can be driven to swing inside the rotating ring 34, the swinging block 72 swings to extrude the elastic air bag 73, so that the air inside the elastic air bag 73 is discharged from an air outlet, the air flow inside the lower die 1 can be further accelerated, the air cooling speed of the lower die 1 and an injection molding groove is improved, when the swinging block 72 can fix a plate 74, the pushing plate 81 can be pushed to rotate, the knocking block 83 can move on the collision block 84, the knocking block 83 can knock the collision block 84 and the swinging block 72, the rotating ring 34 and the lower die 1 can vibrate, when the pushing plate 81 rotates, the clamping plate 93 can be pushed to move, the free end of the elastic telescopic rod 91 can extend upwards, when the pushing plate 81 cannot move the clamping plate 93, the gravity block 92 can rapidly move downwards, so that the swinging force of the swinging block 72 can be improved, can increase the extruded degree to elastic air bag 73, can improve the gaseous dynamics of the jet-propelled gas of elastic air bag 73 and the gaseous dynamics of blowout, further improve the speed that the inside air of lower mould 1 flows, lower mould 1 vibrates and can improve the efficiency that plastics break away from.

When the injection molding machine works (or is used), the driving device 41 is started, the driving device 41 can drive the rectangular elastic telescopic rod 42 to rotate, the rectangular elastic telescopic rod 42 can drive the fan plate 43 and the friction plate 44 to rotate, the friction plate 44 can rub at the bottom of the injection molding groove, heat generated by rubbing through the friction plate 44 can be transferred to the inside of the injection molding groove, high-temperature molten plastic is added into the injection molding groove, so that the temperature inside the lower die 1 is increased, gas inside the sealing frame 31 can expand when the temperature inside the lower die 1 is increased, the piston 32 and the fixing shaft 33 can be pushed to move upwards through gas expansion inside the sealing frame 31, the fixing shaft 33 moves upwards to move the spiral chute to drive the sliding rod 36, the fixing rod 35 and the rotating ring 34 to rotate, the rotating ring 34 can drive the swinging plate 37 to rotate, and the lug 38 on the swinging plate 37 can be in contact with the injection molding groove, the swing plate 37 and the bump 38 can knock the injection molding groove, the injection molding groove can vibrate through knocking of the swing plate 37, bubbles of air in melted plastic can be removed, the swing block 72 can swing inside the swing ring 34 when the swing ring 34 rotates, the swing block 72 can extrude the elastic airbag 73 when swinging, gas inside the elastic airbag 73 can be sprayed out from a gas outlet, when the swing block 72 swings the push plate 81 to be contacted with the fixed plate 74, the fixed plate 74 can push the push plate 81 to rotate, the push plate 81 can push the knocking block 83 to slide on the collision block 84 by rotating the elastic plate 82, the knocking block 83 can knock the collision block 84 and the swing block 72, vibration on the swing block 72 can be transmitted to the swing ring 34 and the lower die 1, when the push plate 81 rotates, the free end of the elastic telescopic rod 91 can be pushed to extend upwards through transmission of the clamping plate 93, when the pushing plate 81 can not push the blocking plate 93, the gravity block 92 can move downwards at an accelerated speed through the elasticity of the elastic telescopic rod 91 and the gravity of the gravity block 92, the gravity block 92 can improve the rotating speed and force of the swinging block 72, the positioning rod 54 can be inserted into the positioning cylinder 52 when the upper die 2 moves downwards, the positioning rod 54 can push the triangular pushing block 53 to move, the triangular pushing block 53 can push the arc-shaped scraping plate 51 to rotate back and forth when moving, the arc-shaped scraping plate 51 can clean the top of the lower die 1 through rotating, the positioning rod 54 can push the pressing plate 61 to move downwards when being completely inserted into the positioning cylinder 52, the pressing plate 61 can move downwards to drive the roller 62 to move downwards, the roller 62 can move downwards to push the annular plate 63 to move downwards, the annular plate 63 can drive the free end of the rectangular elastic telescopic rod 42 to move downwards through the connecting rod 64, the free end of the rectangular elastic telescopic rod 42 can drive the fan plate 43 and the friction plate 44 to move downwards, so that the friction plate 44 is separated from the bottom of the injection molding groove, the fan plate 43 rotates to increase the flow of air inside the lower die 1, after plastics inside the injection molding groove are solidified and the temperature is reduced, the gas inside the sealing frame 31 can contract, the piston 32 and the fixing shaft 33 can be driven to move downwards, the sliding rod 36, the fixing rod 35 and the rotating ring 34 can also be driven to rotate, the swinging plate 37 and the bump 38 can also knock the injection molding groove, and the injection molding groove can vibrate.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an injection mold is used in production of plastics gear, includes bed die (1), its characterized in that: the top of bed die (1) is provided with mould (2), the groove of moulding plastics has been seted up at the top of bed die (1), the inner wall bottom fixed mounting of bed die (1) has sealed frame (31), slidable mounting has piston (32) on the inner wall of sealed frame (31), the top fixed mounting of piston (32) has fixed axle (33), rotate on the top inner wall of bed die (1) and install swivel becket (34), the bottom fixed mounting of swivel becket (34) has dead lever (35), the bottom fixed mounting of dead lever (35) has slide bar (36), the spiral spout has been seted up on the outer wall of fixed axle (33), slide bar (36) slidable mounting is in the inside of spiral spout, rotate on the inner wall of swivel becket (34) and install swing board (37), the equal fixed mounting in the left and right sides of swing board (37) has lug (38), the swing plate (37) is elastically connected with the inner wall of the rotating ring (34) through a first elastic sheet.

2. The injection mold for producing plastic gears according to claim 1, characterized in that: the bottom fixed mounting who moulds plastics the groove has drive arrangement (41), fixed mounting has rectangle elasticity telescopic link (42) on the output of drive arrangement (41), the bottom free end fixed mounting of rectangle elasticity telescopic link (42) has fan board (43), the top fixed mounting of fan board (43) has friction plate (44), friction plate (44) and the bottom contact of the groove of moulding plastics.

3. The injection mold for producing plastic gears according to claim 1, characterized in that: the top of bed die (1) is rotated and is installed arc scraper blade (51), arc scraper blade (51) are provided with two, and two arc scraper blade (51) are through No. two shell fragment elastic connection, the top slidable mounting of bed die (1) has triangle-shaped to promote piece (53), triangle-shaped promotes the face contact that is close to of piece (53) and two arc scraper blade (51).

4. The injection mold for producing plastic gears according to claim 3, wherein: the bottom of the upper die (2) is fixedly provided with a positioning rod (54), the bottom of the upper die (2) is provided with a groove matched with the arc-shaped scraper (51) and the triangular pushing block (53), the inner wall and the outer wall of the top of the lower die (1) are fixedly sleeved with the positioning barrel (52), and the triangular pushing block (53) penetrates through the top of the positioning barrel (52) and is slidably arranged on the positioning barrel (52).

5. The injection mold for producing plastic gears according to claim 4, wherein: the spout has been seted up on the right side of a location section of thick bamboo (52), slidable mounting has pressure plate (61) on the inner wall of spout, pressure plate (61) are through No. three shell fragments and spout elastic connection, the fixed slot has been seted up to the bottom of pressure plate (61), rotate on the inner wall of fixed recess and install gyro wheel (62), annular plate (63) and annular plate (63) slidable mounting are run through on dead lever (35) in dead lever (35), annular plate (63) are through No. four shell fragments and dead lever (35) elastic connection, the inner wall of annular plate (63) is fixed with the one end of connecting rod (64), the other end of connecting rod (64) rotates with the left and right sides end bottom of rectangle elasticity telescopic link (42) and is connected.

6. The injection mold for producing plastic gears according to claim 1, characterized in that: the cavity is opened to the inside of rotating ring (34), and cavity inner wall top rotates and installs connecting rod (71), and the bottom fixed mounting that drives connecting rod (71) has swing piece (72), and the bottom fixed mounting of cavity has elasticity gasbag (73), the gas outlet of intercommunication is seted up to the bottom of elasticity gasbag (73) and the bottom of rotating ring (34).

7. The injection mold for producing plastic gears according to claim 6, wherein: fixed mounting has fixed plate (74) on the inner wall of cavity, it installs slurcam (81) to rotate on the interior outer wall of swing piece (72), the outside fixed mounting that slurcam (81) are located swing piece (72) has elastic plate (82), the one end fixed mounting that pushing plate (81) were kept away from in elastic plate (82) has strikes piece (83), the right side fixed mounting of swing piece (72) has impact block (84), strike piece (83) and impact block (84) contact.

8. The injection mold for producing plastic gears according to claim 6, wherein: an elastic telescopic rod (91) is fixedly mounted on the inner wall of the swinging block (72), a gravity block (92) is fixedly mounted at the bottom of the free end of the elastic telescopic rod (91), and a clamping plate (93) is fixedly mounted at the left end and the right end of the elastic telescopic rod (91).