CN108501314B

CN108501314B - Plastic gear injection mold

Info

Publication number: CN108501314B
Application number: CN201810188612.6A
Authority: CN
Inventors: 柴建华
Original assignee: Qinghai Haishihao Plastic Co ltd
Current assignee: QINGHAI HAISHIHAO PLASTIC Co.,Ltd.
Priority date: 2018-03-07
Filing date: 2018-03-07
Publication date: 2021-04-02
Anticipated expiration: 2038-03-07
Also published as: CN108501314A; CN112677421A

Abstract

The invention discloses a plastic gear injection mold, which structurally comprises a material box, a lower mold seat, a first spring, a lower mold, an upper mold seat, a material pipe and a switching device, wherein the lower mold seat is fixedly connected to the top of the material box, the lower mold is connected to the lower mold seat, the lower mold is matched with the upper mold arranged above the lower mold, the upper mold seat is fixedly connected to the upper mold, the upper mold seat is connected with the material box through the material pipe, the switching device is arranged inside the material box, the first 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 inside the shell, and the plastic gear injection mold can realize injection molding of materials in the material box when the materials reach a certain temperature through the switching device, so as to, preventing the product from being crisp and improving the quality of the product.

Description

Plastic gear injection mold

Technical Field

The invention discloses a plastic gear injection mold, 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 to solve the problem that the product is fragile and the quality of the product is affected 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 structurally comprises a material box, a lower mold seat, a first spring, a lower mold, an upper mold seat, a material pipe and a switch device, wherein the lower mold seat is fixedly connected to the top of the material box, the lower mold is connected to the lower mold seat, the lower mold is matched with the upper mold arranged above the lower mold, the upper mold seat is fixedly connected to the upper mold, the upper mold seat is connected with the material box through the material pipe, a switch device is arranged inside the material box, the first 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 of the shell, the bottom of the reset device is hinged to the left side of the power device, and the power device is in transmission connection with the, 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.

Furthermore, the reset device consists of a first connecting rod, a first piston rod, a guide port, a first piston, a cylinder body, a second piston rod, a rod head, an elastic plate, a guide rod and a second spring, one end of the first connecting rod is hinged with the top rod, the other end of the top rod is hinged with one end of the first piston rod, the other end of the first piston rod penetrates through a guide port matched with the first piston rod and is fixedly connected with a first piston arranged in one end of the cylinder body, the other end of the cylinder body is provided with a second piston which is connected with one end of a second piston rod, the other end of the second piston rod is vertically connected with an elastic plate, through holes are arranged on two sides of the elastic plate, the through hole is matched with the guide rod, one end of the guide rod is connected with the top of the shell, the other end of the guide rod is welded with the rod head, and the outer surface of the guide rod is sleeved with the second 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, 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 first spring to make the molds fall off after cooling, when a thermal bulb is heated, the pressure of internal working substances is increased due to the 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 a second spring, the jacking rod moves the bottom end of the moving rod to the left, the top end of the moving rod pushes a rotating rod to the right through a second connecting rod to rotate a gear, a rack is pulled to the 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, materials in the material box can be injected when the materials reach 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 brittle, 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 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 first 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 shifting plate-862, a silica gel gasket-863, a capillary tube-864, a thermal bulb-865, a first connecting rod-810, a first piston rod-811, a guide port-812, a first piston-813, a cylinder-814, a second piston-815, a second piston rod-816, a rod head-817, an elastic plate-818, a spring plate-4, a lower die-, Guide rod-819, second 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, rotating disc-835, second hinge shaft-836, third hinge shaft-837, lower fixing plate-840, sliding block-841, sliding 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 post-855, hinge plate-856, third connecting rod-857, A return spring-870, 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, which comprises: the structure of the automatic feeding device comprises a material box 1, a lower die holder 2, a first 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 first spring 3 is arranged between the lower die 4 and the upper die 5, the switch device 8 comprises a shell 80, a resetting 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 resetting device 81 is arranged on the side inside the shell 80, 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 second spring 8110, wherein one end of the first connecting rod 810 is hinged to a top rod 860, the other end of the top 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 817, the outer surface of the guide rod 819 is sleeved with a second 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 up by the first 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 advances 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, the second piston 815 at the other end of the cylinder body 814 is pushed outwards through the action of the oil, the elastic plate 818 overcomes the thrust of the second spring 8110, the bottom end of the moving rod 820 is moved to the left when the jacking rod 860 advances, the top end of the moving rod 820 pushes the rotating rod to the right through the second connecting rod 822, the gear 824 is rotated to pull the rack 830 to move left, the rotating wheel 834 is rotated by a certain angle, the pull rod 848 moves along with the gear, 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 return 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 return spring 870, and the linkage 82 and the power device 86 can be reset through the second 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 plastic gear injection mold, its structure includes workbin (1), die holder (2), first spring (3), bed die (4), goes up mould (5), upper die base (6), material pipe (7), switching device (8), workbin (1) top fixedly connected with die holder (2), be connected with bed die (4) on die holder (2), bed die (4) cooperatees with last mould (5) of establishing in the top, go up mould (5) top fixedly connected with upper die base (6), upper die base (6) are connected with workbin (1) through material pipe (7), workbin (1) internally mounted has switching device (8), be equipped with first spring (3) between bed die (4) and last mould (5), switching device (8) are by casing (80), resetting means (81), aggregate unit (82), The device comprises a transmission device (83), a pulling device (84), a power connection device (85), a power device (86) and a return mechanism (87), wherein a reset device (81) is installed on the side face inside a shell (80), the bottom of the reset device (81) is hinged to the left side of the power device (86), the power device (86) is in transmission connection with the transmission device (83) through a linkage device (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), the left side of the power connection device (85) is in contact with the return mechanism (87), the power device (86) consists of 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), and the thermal bulb (865) is communicated with one end of the sealing barrel (861) through the capillary tube (864), a moving plate (862) matched with the sealing barrel (861) is arranged in the sealing barrel (861), one surface of the moving plate (862) is attached to a silica gel gasket (863), the other surface of the moving plate (862) is vertically connected with a top rod (860), the top rod (860) penetrates through the other end of the sealing barrel (861), the reset device (81) consists of a first connecting rod (810), a first piston rod (811), a guide port (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 second spring (8110), one end of the first connecting rod (810) is hinged with the top rod (860), the other end of the top 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 port (812) matched with the first piston rod and is fixedly connected with a first piston (813) arranged in one end of the cylinder body (814), the other end of the cylinder body (814) is provided with a second piston (815), the second piston (815) is connected with one end of a second piston rod (816), the other end of the second piston rod (816) is vertically connected with an elastic plate (818), through holes are formed in two sides of the elastic plate (818), the through holes are matched with a 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), a second spring (8110) is sleeved on the outer surface of the guide rod (819), the linkage device (82) is composed of a moving rod (820), a first hinge shaft (821), a second connecting rod (822), a rotating rod (823) and a gear (824), the bottom end of the moving rod (820) is hinged to a push rod (860), a sliding groove is formed in the middle of the moving rod (820), and the sliding groove is matched with the first hinge shaft (821), the top of the moving rod (820) is hinged to the movable end of a rotating rod (823) through a second connecting rod (822), the fixed end of the rotating rod (823) is fixedly connected with the center of a gear (824), the transmission device (83) is composed of a rack (830), a limiting pulley (831), a support frame (832), a shaft frame (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 frame (833), the gear (824) is installed at one end of the shaft frame (833), 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 (837) is installed at the other end of the shaft frame (833), 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 pull rod (848), wherein the pull rod (848) is connected to the tangent plane of a rotating wheel (834), the pull rod (848) is connected with one end of the pulling rope (846), the other end of the pulling rope (846) bypasses the second pulley (847), the first pulley (845) is connected with the sliding block (841), the sliding block (841) is sleeved on the sliding rod (842) matched with the sliding block (846), the two ends of the sliding rod (842) are respectively connected to the lower fixing plate (840) and the upper fixing plate (844), the lower fixing plate (840) and the upper fixing plate (844) are vertically connected with the guide plate (843), and the power connection device (85) is composed of a vertical plate (850), a support (851), an anode contact (852, The improved structure of the hinge plate comprises a negative contact piece (853), an insulating seat (854), a first guide post (855), a hinge plate (856) and a third connecting rod (857), wherein the vertical plate (850) is connected between a shaft bracket (833) and a sealing barrel (861), a positive contact piece (852) is pasted on the vertical plate (850), the side surface of the positive contact piece (852) is provided with the negative contact piece (853) which is parallel to the positive contact piece, the positive contact piece (852) is pasted on the side surface of the insulating seat (854), the insulating seat (854) is parallel to the hinge plate (856) and fixedly connected with the hinge plate (856) through the first guide post (855), the first guide post (855) penetrates through the side surface of a support (851), two ends of the support (851) are fixedly connected with the vertical plate (850), the hinge plate (856) is hinged to a sliding block (841) through the third connecting rod (857), and the return mechanism (87) is composed of a return spring (871), a, The supporting plate (874) is parallel to the insulating seat (854), the supporting plate (874) is fixedly connected with the insulating seat (854) through the second guide post (875), the second guide post (875) penetrates through the vertical plate (850), the supporting plate (874) is vertically connected with one end of the supporting plate (873), the other end of the supporting plate (873) is hinged to 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 return spring (870);

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 up by the first spring (3) after cooling to enable the dies to fall off, when the thermal bulb (865) is heated, the pressure of the internal working substance 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 jacking rod (860) are pushed forward, the jacking rod (860) advances 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, the second piston (815) at the other end of the cylinder body (814) is pushed outward through the action of the oil, and the elastic plate (818) advances against the thrust of the second spring (8110), when the top rod (860) moves forward, the bottom end of the moving rod (820) moves to the left, the top end of the moving rod (820) pushes the rotating rod (823) to the right through the second connecting rod (822), so that the gear (824) rotates, the rack (830) is pulled to move to the left, the rotating wheel (834) rotates for a certain angle, the pull rod (848) moves along with the rotating wheel, the sliding block (841) is pulled upwards through the pulling rope (846), the third connecting rod (857) pushes the insulating seat (854) to move, the positive contact piece (852) and the negative contact piece (853) are contacted to enable the pump to work, the supporting rod (873) moves leftwards when the insulating seat (854) moves, the bottom of the lever (871) overcomes the pushing force of the return spring (870) to move rightwards, when the temperature is too low, the power is lost, the positive contact piece (852) and the negative contact piece (853) can be separated through the return spring (870), the linkage (82) and the power device (86) can be reset by the second spring (8110).