CN112677421A

CN112677421A - Plastic gear injection mold and using method thereof

Info

Publication number: CN112677421A
Application number: CN202110139244.8A
Authority: CN
Inventors: 柴建华
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-03-07
Filing date: 2018-03-07
Publication date: 2021-04-20
Also published as: CN108501314B; CN108501314A

Abstract

The invention discloses a plastic gear injection mold and a using method thereof, the structure of the plastic gear injection mold comprises a material box, a lower mold seat, a spring, a lower mold, an upper mold seat, a material pipe and a switching device, the top of the material box is fixedly connected with the lower mold seat, the lower mold is connected with the lower mold, the lower mold is matched with the upper mold arranged above the lower mold, the upper mold is fixedly connected with the upper mold seat, the upper mold seat is connected with the material box through the material pipe, the switching device is arranged in the material box, the spring is arranged between the lower mold and the upper mold, the switching device comprises a shell, a reset device, a linkage device, a transmission device, a pulling device, a power device and a return mechanism, the reset device is arranged on the side surface in the shell, the plastic gear injection mold and the using method thereof can carry out injection molding on materials in the, the condition of over-low temperature of the materials is avoided, the product is prevented from being crisp, and the quality of the product is improved.

Description

Plastic gear injection mold and using method thereof

The application is a divisional application of a plastic gear injection mold, wherein the application date is 2018, 3, 7 and the application number is CN 201810188612.6.

Technical Field

The invention discloses a plastic gear injection mold and a using method thereof, and belongs to the field of plastic gear injection molds.

Background

The gear transmission is a common transmission mode in people's life, and its transmission stationarity is very high, and life is longer. With the continuous progress of science and technology, gears made of plastics are more and more, and the gear transmission mechanism is mainly used in an industry with small transmission torque, and is low in production cost, low in transportation cost, safe and convenient to maintain.

The existing gear injection mold is easy to cause that the temperature of a charging barrel is too low during production and injection molding, so that the product is brittle and the quality of the product is influenced.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a plastic gear injection mold and a using method thereof, so as to solve the problem that the product is fragile and the quality of the product is influenced due to the fact that the temperature of a charging barrel is too low easily during production and injection molding of the conventional gear injection mold.

In order to achieve the purpose, the invention is realized by the following technical scheme: a plastic gear injection mold and a using method thereof are disclosed, the structure of the plastic gear injection mold comprises a material box, a lower mold seat, a spring, a lower mold, an upper mold seat, a material pipe and a switch device, the top of the material box is fixedly connected with the lower mold seat, the lower mold is connected with the lower mold, the lower mold is matched with the upper mold arranged above the lower mold, the upper mold is fixedly connected with the upper mold seat, the upper mold seat is connected with the material box through the material pipe, the switch device is arranged inside the material box, the spring is arranged between the lower mold and the upper mold, the switch device is composed of a shell, a reset device, a linkage device, a transmission device, a pulling device, a power device and a return mechanism, the reset device is arranged on the side inside the shell, the bottom of the reset device is hinged with the left side of the power device, the transmission device is connected with one end of the pulling device, the other end of the pulling device is movably connected with the power connection device, and the left side of the power connection device is in contact with the return mechanism.

Further, the power device comprises an ejector rod, a sealing barrel, a movable plate, a silica gel gasket, a capillary tube and a thermal bulb, wherein the thermal bulb is communicated with one end of the sealing barrel through the capillary tube, the movable plate matched with the sealing barrel is arranged in the sealing barrel, one surface of the movable plate is attached to the silica gel gasket, the other surface of the movable plate is vertically connected with the ejector rod, and the ejector rod penetrates through the other end of the sealing barrel.

Further, resetting means comprises first connecting rod, first piston rod, guide way, first piston, cylinder body, second piston rod, pole head, elastic plate, guide arm, spring, first connecting rod one end is articulated mutually with the ejector pin, the other end of ejector pin is articulated mutually with the one end of first piston rod, the other end of first piston rod runs through matched with guide way with it and establishes the first piston fixed connection in cylinder body one end, the other end of cylinder body is equipped with the second piston, the second piston is connected with second piston rod one end, the other end and the elastic plate of second piston rod are connected perpendicularly, open elastic plate both sides has the through-hole, the through-hole cooperatees with the guide arm, guide arm one end is connected with the casing top, the welding of guide arm other end has the pole head, the outer surface cover of guide arm is equipped with the spring.

Furthermore, the linkage device comprises a moving rod, a first hinge shaft, a second connecting rod, a rotating rod and a gear, wherein the bottom end of the moving rod is hinged to the ejector rod, a sliding groove is formed in the middle of the moving rod and matched with the first hinge shaft, the top of the moving rod is hinged to the movable end of the rotating rod through the second connecting rod, and the fixed end of the rotating rod is fixedly connected with the center of the gear.

Furthermore, the transmission device comprises a rack, a limiting pulley, a support frame, a shaft frame, a rotating wheel, a rotating disc, a second hinge shaft and a third hinge shaft, one end of the support frame is fixedly connected with the shell, the other end of the support frame is vertically connected with the shaft frame, a gear is installed at one end of the shaft frame and is meshed with the rack, the rack is fixedly connected with the rotating disc, the rotating disc is installed on the rotating wheel through the second hinge shaft, and the rotating wheel is installed at the other end of the shaft frame through the third hinge shaft.

Furthermore, the pulling device comprises a lower fixing plate, a sliding block, a sliding rod, a guide plate, an upper fixing plate, a first pulley, a pull rope, a second pulley and a pull rod, wherein the pull rod is connected to the tangent plane of the rotating wheel and is connected with one end of the pull rope, the other end of the pull rope is connected with the sliding block by bypassing the second pulley and the first pulley, the sliding block is sleeved on the sliding rod matched with the sliding block, two ends of the sliding rod are respectively connected to the lower fixing plate and the upper fixing plate, and the lower fixing plate and the upper fixing plate are vertically connected with the guide plate.

Further, the power connection device comprises a vertical plate, a support, a positive contact, a negative contact, an insulating seat, a first guide pillar, a hinged plate and a third connecting rod, wherein the vertical plate is connected between the shaft bracket and the sealing barrel, the positive contact is adhered to the vertical plate, the negative contact parallel to the positive contact is arranged on the side surface of the positive contact, the positive contact is adhered to the side surface of the insulating seat, the insulating seat and the hinged plate are parallel to each other and fixedly connected with each other through the first guide pillar, the first guide pillar penetrates through the side surface of the support, two ends of the support are fixedly connected with the vertical plate, and the hinged plate is hinged with the sliding block through the third connecting rod.

Furthermore, the return mechanism comprises a return spring, a lever, a fourth hinge shaft, a support rod, a support plate and a second guide pillar, the support plate and the insulating seat are parallel to each other and fixedly connected through the second guide pillar, the second guide pillar penetrates through the vertical plate, the support plate is vertically connected with one end of the support rod, the other end of the support rod is hinged with the top end of the lever, the middle of the lever is matched with the fourth hinge shaft, and the bottom end of the lever is elastically connected with the vertical plate through the return spring.

Advantageous effects

The invention relates to a plastic gear injection mold and a using method thereof, when the material in a material box reaches a certain temperature, a switch device enables a lifting pump to work to lift the material into material cavities of a lower mold and an upper mold for molding, the upper mold is jacked up by a spring to make the molds fall off after cooling, when a thermal bulb is heated, internal working substances are increased in pressure due to temperature rise, the changed pressure is transmitted into a sealing cylinder through a capillary tube, at the moment, a moving plate and a jacking rod are pushed forward, the jacking rod pushes a first piston into a cylinder body through a first connecting rod, the cylinder body is filled with oil, a second piston at the other end of the cylinder body is pushed outwards through the action of the oil, an elastic plate overcomes the forward thrust of the spring, the bottom end of the moving rod moves leftwards when the jacking rod moves forwards, the top end of the moving rod pushes a rotary rod rightwards through the second connecting rod to enable a gear to rotate, a rack is pulled to move left, the rotating wheel is rotated by a certain angle, the pull rod moves along with the rotating wheel, the sliding block is pulled upwards through the pull rope, the third connecting rod pushes the insulating seat to move, the positive contact piece and the negative contact piece are contacted to enable the pump to work, the supporting rod moves leftwards when the insulating seat moves, the pushing force of the reset spring is overcome at the bottom of the lever to move rightwards, when the temperature is too low, power is lost, the positive contact piece and the negative contact piece can be separated through the reset spring, and the linkage device and the power device can be reset through the spring.

According to the plastic gear injection mold and the using method thereof, materials in the material box can be injected when the temperature reaches a certain temperature through the switch device, the condition that the temperature of the materials is too low is avoided, the product is prevented from being crisp, and the quality of the product is improved.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

fig. 1 is a schematic structural diagram of a plastic gear injection mold and a method for using the same according to the present invention.

Fig. 2 is a schematic structural diagram of the switching device of the present invention.

Fig. 3 is a detailed structural diagram of the switching device of the present invention.

Fig. 4 is a schematic structural diagram of the operating state of the switching device of the present invention.

In the figure: a bin-1, a lower die holder-2, a spring-3, a lower die-4, an upper die-5, an upper die holder-6, a material pipe-7, a switching device-8, a shell-80, a reset device-81, a linkage device-82, a transmission device-83, a pulling device-84, a power device-85, a power device-86, a return mechanism-87, a push rod-860, a sealing cylinder-861, a moving plate-862, a silica gel gasket-863, a capillary-864, a warm pack-865, a first connecting rod-810, a first piston rod-811, a guide port-813, a first piston-814, a cylinder-814, a second piston rod-815, a second piston rod-816, a rod head-817, an elastic plate-818, a guide rod-819, Spring-8110, moving rod-820, first hinge shaft-821, second connecting rod-822, rotating rod-823, gear-824, rack-830, limiting pulley-831, support frame-832, shaft bracket-833, rotating wheel-834, rotary disc-835, second hinge shaft-836, third hinge shaft-837, lower fixing plate-840, slide block-841, slide rod-842, guide plate-843, upper fixing plate-844, first pulley-845, pull rope-846, second pulley-847, pull rod-848, vertical plate-850, support-851, positive contact-852, negative contact-853, insulating seat-854, first guide pillar-855, hinge plate-856, third connecting rod-857, reset spring-870, and reset spring-824, A lever-871, a fourth hinge shaft-872, a support rod-873, a support plate-874 and a second guide post-875.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

Referring to fig. 1-4, the present invention provides a plastic gear injection mold and a method for using the same, comprising: the structure of the automatic feeding device comprises a material box 1, a lower die holder 2, a spring 3, a lower die 4, an upper die 5, an upper die holder 6, a material pipe 7 and a switch device 8, wherein the lower die holder 2 is fixedly connected to the top of the material box 1, the lower die 4 is connected to the lower die holder 2, the lower die 4 is matched with the upper die 5 arranged above the lower die, the upper die holder 6 is fixedly connected to the upper side of the upper die 5, the upper die holder 6 is connected with the material box 1 through the material pipe 7, the switch device 8 is arranged inside the material box 1, the spring 3 is arranged between the lower die 4 and the upper die 5, the switch device 8 comprises a shell 80, a reset device 81, a linkage device 82, a transmission device 83, a pulling device 84, a power connection device 85, a power device 86 and a return mechanism 87, the reset device 81 is arranged on the inner side surface of the, the power device 86 is in transmission connection with the transmission device 83 through the linkage 82, the transmission device 83 is connected with one end of the pulling device 84, the other end of the pulling device 84 is movably connected with the power connection device 85, and the left side of the power connection device 85 is in contact with the return mechanism 87.

The power device 86 comprises a top rod 860, a sealing cylinder 861, a moving plate 862, a silica gel gasket 863, a capillary tube 864 and a thermal bulb 865, wherein the thermal bulb 865 is communicated with one end of the sealing cylinder 861 through the capillary tube 864, the sealing cylinder 861 is internally provided with the moving plate 862 matched with the sealing cylinder 861, one surface of the moving plate 862 is attached to the silica gel gasket 863, the other surface of the moving plate 862 is vertically connected with the top rod 860, and the top rod 860 penetrates through the other end of the sealing cylinder 861.

The resetting device 81 comprises a first connecting rod 810, a first piston rod 811, a guide opening 812, a first piston 813, a cylinder body 814, a second piston 815, a second piston rod 816, a rod head 817, an elastic plate 818, a guide rod 819 and a spring 8110, wherein one end of the first connecting rod 810 is hinged to a push rod 860, the other end of the push rod 860 is hinged to one end of the first piston rod 811, the other end of the first piston rod 811 penetrates through the guide opening 812 matched with the first piston rod and is fixedly connected with the first piston 813 arranged in one end of the cylinder body 814, the other end of the cylinder body 814 is provided with the second piston 815, the second piston 815 is connected with one end of the second piston rod 816, the other end of the second piston rod 816 is vertically connected with the elastic plate 818, through holes are formed in two sides of the elastic plate 818, the through holes are matched with the guide rod 819, one end of the guide rod 819 is connected with the top of the shell 80, the rod head, the outer surface of the guide rod 819 is sleeved with a spring 8110.

The linkage device 82 comprises a moving rod 820, a first hinge shaft 821, a second connecting rod 822, a rotating rod 823 and a gear 824, wherein the bottom end of the moving rod 820 is hinged to a top rod 860, a sliding groove is formed in the middle of the moving rod 820 and matched with the first hinge shaft 821, the top of the moving rod 820 is hinged to the movable end of the rotating rod 823 through the second connecting rod 822, and the fixed end of the rotating rod 823 is fixedly connected with the center of the gear 824.

The transmission device 83 is composed of a rack 830, a limiting pulley 831, a support frame 832, a shaft bracket 833, a rotating wheel 834, a rotating disc 835, a second hinge shaft 836 and a third hinge shaft 837, one end of the support frame 832 is fixedly connected with the shell 80, the other end of the support frame 832 is vertically connected with the shaft bracket 833, one end of the shaft bracket 833 is provided with the gear 824, the gear 824 is meshed with the rack 830, the rack 830 is fixedly connected with the rotating disc 835, the rotating disc 835 is installed on the rotating wheel 834 through the second hinge shaft 836, and the rotating wheel 834 is installed at the other end of the shaft bracket 833 through the third hinge shaft 837.

The pulling device 84 is composed of a lower fixing plate 840, a sliding block 841, a sliding rod 842, a guide plate 843, an upper fixing plate 844, a first pulley 845, a pulling rope 846, a second pulley 847 and a pulling rod 848, wherein the pulling rod 848 is connected to the tangent plane of the rotating wheel 834, the pulling rod 848 is connected with one end of the pulling rope 846, the other end of the pulling rope 846 is connected with the sliding block 841 by bypassing the second pulley 847 and the first pulley 845, the sliding block 841 is sleeved on the sliding rod 842 matched with the sliding block 841, two ends of the sliding rod 842 are respectively connected to the lower fixing plate 840 and the upper fixing plate 844, and the lower fixing plate 840 and the upper fixing plate 844 are perpendicularly connected with the guide plate 843.

The power connection device 85 is composed of a vertical plate 850, a support 851, an anode contact 852, a cathode contact 853, an insulating seat 854, a first guide post 855, a hinge plate 856 and a third connecting rod 857, the vertical plate 850 is connected between a shaft bracket 833 and a sealing barrel 861, the anode contact 852 is adhered to the vertical plate 850, the cathode contact 853 parallel to the anode contact 852 is arranged on the side surface of the anode contact 852, the anode contact 852 is adhered to the side surface of the insulating seat 854, the insulating seat 854 is parallel to the hinge plate 856 and is fixedly connected with the hinge plate 856 through the first guide post 855, the first guide post 855 penetrates through the side surface of the support 851, two ends of the support 851 are fixedly connected with the vertical plate 850, and the hinge plate 856 is hinged to a sliding block 841 through the third connecting rod 857.

The restoring mechanism 87 comprises a restoring spring 870, a lever 871, a fourth hinge shaft 872, a support rod 873, a support plate 874 and a second guide post 875, the support plate 874 is parallel to the insulating base 854, the support plate 874 and the insulating base 854 are fixedly connected through the second guide post 875, the second guide post 875 penetrates through the vertical plate 850, the support plate 874 is vertically connected with one end of the support rod 873, the other end of the support rod 873 is hinged with the top end of the lever 871, the middle of the lever 871 is matched with the fourth hinge shaft 872, and the bottom end of the lever 871 is elastically connected with the vertical plate 850 through the restoring spring 870.

The working principle is as follows: when the material in the bin 1 reaches a certain temperature, the switch device 8 enables the lifting pump to work, the material is lifted to the material cavities of the lower die 4 and the upper die 5 for molding, the upper die 5 is jacked by the spring 3 after cooling to enable the dies to fall off, after the thermal bulb 865 is heated, the pressure of the internal working material is increased due to the temperature rise, the changed pressure is transmitted to the sealing barrel 861 through the capillary tube 864, at this time, the moving plate 862 and the jacking rod 860 are pushed forward, the jacking rod 860 is pushed forward to push the first piston 813 into the cylinder body 814 through the first connecting rod 810, the cylinder body 814 is filled with oil, through the action of the oil, the second piston 815 at the other end of the cylinder body 814 is pushed outwards, the elastic plate 818 is pushed forward against the pushing force of the spring 8110, the bottom end of the moving rod 820 is moved leftwards when the jacking rod 860 is pushed forwards, the top end of the moving rod 820 is pushed rightwards through the second connecting rod 822, the gear 824, the rack 830 is pulled to move left, the rotating wheel 834 rotates by a certain angle, the pull rod 848 moves along with the rack, the sliding block 841 is pulled upwards through the pull rope 846, the third connecting rod 857 pushes the insulating seat 854 to move, the positive contact 852 and the negative contact 853 are contacted to enable the pump to work, the supporting rod 873 moves left when the insulating seat 854 moves, the bottom of the lever 871 overcomes the thrust of the reset spring 870 to move right, when the temperature is too low, the power is lost, the positive contact 852 and the negative contact 853 can be separated through the reset spring 870, and the linkage 82 and the power device 86 can be reset through the spring 8110.

The invention solves the problem that the temperature of a charging barrel is too low to cause product brittleness and influence the quality of the product easily when the existing gear injection mold is used for producing injection, and the invention can enable the material in a material box to be injected when the temperature reaches a certain temperature through the mutual combination of the components and the switching device, thereby avoiding the condition of too low temperature of the material, preventing the product from being brittle and improving the quality of the product.

While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides a plastics gear injection mold, its structure includes workbin (1), die holder (2), spring (3), bed die (4), goes up mould (5), upper die base (6), material pipe (7), switching device (8), its characterized in that:

the top of the material box (1) is fixedly connected with a lower die holder (2), the lower die holder (2) is connected with a lower die (4), the lower die (4) is matched with an upper die (5) arranged above the lower die, an upper die holder (6) is fixedly connected above the upper die (5), the upper die holder (6) is connected with the material box (1) through a material pipe (7), a switch device (8) is arranged inside the material box (1), and a spring (3) is arranged between the lower die (4) and the upper die (5);

the switch device (8) consists of a shell (80), a reset device (81), a linkage device (82), a transmission device (83), a pulling device (84), an electric connection device (85), a power device (86) and a return mechanism (87);

the power supply device is characterized in that a reset device (81) is installed on the side face inside the shell (80), the bottom of the reset device (81) is hinged to the left side of a power device (86), the power device (86) is in transmission connection with a transmission device (83) through a linkage device (82), the transmission device (83) is connected with one end of a pulling device (84), the other end of the pulling device (84) is movably connected with a power connection device (85), and the left side of the power connection device (85) is in contact with a return mechanism (87);

the power device (86) comprises a top rod (860), a sealing barrel (861), a moving plate (862), a silica gel gasket (863), a capillary tube (864) and a thermal bulb (865), wherein the thermal bulb (865) is communicated with one end of the sealing barrel (861) through the capillary tube (864), the moving plate (862) matched with the sealing barrel is arranged in the sealing barrel (861), one surface of the moving plate (862) is attached to the silica gel gasket (863), the other surface of the moving plate (862) is vertically connected with the top rod (860), and the top rod (860) penetrates through the other end of the sealing barrel (861).

2. The plastic gear injection mold of claim 1, wherein: the resetting device (81) consists of a first connecting rod (810), a first piston rod (811), a guide opening (812), a first piston (813), a cylinder body (814), a second piston (815), a second piston rod (816), a rod head (817), an elastic plate (818), a guide rod (819) and a spring (8110), one end of the first connecting rod (810) is hinged with a push rod (860), the other end of the push rod (860) is hinged with one end of the first piston rod (811), the other end of the first piston rod (811) penetrates through the guide opening (812) matched with the other end of the first piston rod and is fixedly connected with the first piston (813) arranged in one end of the cylinder body (814), the other end of the cylinder body (814) is provided with the second piston (815), the second piston (815) is connected with one end of the second piston rod (816), and the other end of the second piston rod (816) is vertically connected with the elastic plate (818), through holes are formed in two sides of the elastic plate (818), the through holes are matched with the guide rod (819), one end of the guide rod (819) is connected with the top of the shell (80), a rod head (817) is welded at the other end of the guide rod (819), and a spring (8110) is sleeved on the outer surface of the guide rod (819).

3. The plastic gear injection mold of claim 1, wherein: linkage device (82) comprises carriage release lever (820), first hinge pin (821), second connecting rod (822), rotary rod (823), gear (824), the bottom and ejector pin (860) of carriage release lever (820) are articulated mutually, it has the spout to open in the middle of carriage release lever (820), the spout cooperatees with first hinge pin (821), the movable end of carriage release lever (820) top through second connecting rod (822) and rotary rod (823) is articulated, rotary rod (823) stiff end and gear (824) central fixed connection.

4. The plastic gear injection mold of claim 1, wherein: transmission (83) comprise rack (830), spacing pulley (831), support frame (832), pedestal (833), runner (834), carousel (835), second hinge axle (836), third hinge axle (837), support frame (832) one end and casing (80) fixed connection, support frame (832) other end and pedestal (833) vertical connection, gear (824) are installed to the one end of pedestal (833), gear (824) and rack (830) mesh mutually, rack (830) and carousel (835) fixed connection, install on runner (834) through second hinge axle (836) carousel (835), install the other end at pedestal (833) through third hinge axle (837) runner (834).

5. The plastic gear injection mold of claim 1, wherein: pulling device (84) comprises bottom plate (840), slider (841), slide bar (842), baffle (843), upper mounting plate (844), first pulley (845), stay cord (846), second pulley (847), pull rod (848) is connected on the tangent plane of runner (834), pull rod (848) is connected with the one end of stay cord (846), the other end of stay cord (846) is walked around second pulley (847), first pulley (845) is connected with slider (841), slider (841) cover is established on matched with slide bar (842) with it, slide bar (842) both ends are connected respectively on bottom plate (840), upper mounting plate (844), bottom plate (840), upper mounting plate (844) are connected with baffle (843) perpendicularly.

6. The plastic gear injection mold of claim 1, wherein: the power connection device (85) consists of a vertical plate (850), a support (851), a positive contact piece (852), a negative contact piece (853), an insulating seat (854), a first guide post (855), a hinge plate (856) and a third connecting rod (857), the vertical plate (850) is connected between the shaft bracket (833) and the sealing cylinder (861), a positive contact piece (852) is adhered on the vertical plate (850), a negative contact piece (853) which is parallel to the positive contact piece (852) is arranged on the side surface of the positive contact piece (852), the positive contact piece (852) is attached to the side surface of the insulating seat (854), the insulating seat (854) and the hinge plate (856) are parallel to each other and fixedly connected with each other through a first guide post (855), the first guide post (855) penetrates through the side surface of the support (851), two ends of the support (851) are fixedly connected with the vertical plate (850), the hinge plate (856) is hinged with the sliding block (841) through a third connecting rod (857).

7. A plastic gear injection mold and a method of using the same as claimed in any one of claims 1-6, wherein:

when the material in the material box (1) reaches a certain temperature, the switch device (8) enables the lifting pump to work, the material is lifted into material cavities of the lower die (4) and the upper die (5) for molding, the upper die (5) is jacked up by the spring (3) after being cooled to enable the dies to fall off, after the thermobulb (865) is heated, the pressure of the internal working material is increased due to the temperature rise, the changed pressure is transmitted into the sealing cylinder (861) through the capillary tube (864), at this time, the movable plate (862) and the ejector rod (860) are pushed forward, the ejector rod (860) advances to push the first piston (813) into the cylinder body (814) through the first connecting rod (810), and the cylinder body (814) is filled with oil;

under the action of oil, a second piston (815) at the other end of a cylinder body (814) is pushed outwards, an elastic plate (818) is enabled to move forwards against the thrust of a spring (8110), the bottom end of a moving rod (820) moves leftwards when a top rod (860) moves forwards, the top end of the moving rod (820) pushes a rotating rod (823) rightwards through a second connecting rod (822), a gear (824) is enabled to rotate, a rack (830) is pulled to move leftwards, a rotating wheel (834) rotates for a certain angle, a pull rod (848) moves along with the rotating rod, a sliding block (841) is pulled upwards through a pull rope (846), a third connecting rod (857) pushes an insulating seat (854) to move, a positive contact piece (852) and a negative contact piece (853) are contacted to enable a pump to work, a support rod (873) moves leftwards when the insulating seat (854) moves, the bottom of a lever (871) overcomes the thrust of a return spring (870) to move rightwards, when the temperature is too low, power is lost, and the positive contact piece (852), The negative contact piece (853) is separated, and the linkage device (82) and the power device (86) can be reset through the spring (8110).