CN112356391A

CN112356391A - Multi-runner plastic injection molding machine

Info

Publication number: CN112356391A
Application number: CN202011046307.7A
Authority: CN
Inventors: 施正良; 王顶明
Original assignee: ZHENJIANG RUIHAO ENGINEERING PLASTIC CO LTD
Current assignee: ZHENJIANG RUIHAO ENGINEERING PLASTIC CO LTD
Priority date: 2020-09-29
Filing date: 2020-09-29
Publication date: 2021-02-12

Abstract

The invention discloses a multi-runner plastic injection molding machine which comprises a heating cylinder, wherein a support frame is fixedly arranged on one side of the top of a mounting plate, a motor is fixedly arranged in the middle of the side wall of one side of the heating cylinder through a support frame, an output shaft of the motor is fixedly sleeved with a rotating shaft, one end of the rotating shaft, which is far away from the motor, penetrates through the side wall of the heating cylinder and extends into the heating cylinder, and a spiral blade is fixedly welded on the surface of the rotating shaft, which extends into the heating cylinder; the shunting block is fixedly inserted at one end of the heating cylinder, which is far away from the motor; the invention effectively solves the problem that the existing multi-runner plastic injection molding machine does not have a device for preheating plastic particles, and the plastic particles are not completely dried in plum rain season or when the air is humid, so that the local plastic particles are not completely melted during melting and plasticizing, thereby reducing the product quality.

Description

Multi-runner plastic injection molding machine

Technical Field

The invention relates to the technical field of plastic injection molding machines, in particular to a multi-runner plastic injection molding machine.

Background

The injection molding machine has the working principle that the plasticized plastic in a molten state (namely, viscous state) is injected into a closed mold cavity by means of the thrust of a screw (or a plunger), and a product is obtained after solidification and shaping, wherein the injection molding is a cyclic process, and each period mainly comprises the following steps: quantitative feeding, melting and plasticizing, pressure injection, mold filling and cooling, mold opening and taking out, closing the mold after taking out the plastic part, and carrying out the next cycle.

However, there are some disadvantages in the conventional using process, such as:

the existing multi-runner plastic injection molding machine is not provided with a device for preheating plastic particles, and the plastic particles are not completely dried in plum rain season or when air is humid, so that the problem that local plastic particles are not completely melted during melting and plasticizing, and the quality of products is reduced is caused.

Disclosure of Invention

The present invention is directed to a multi-runner plastic injection molding machine, which solves the above-mentioned problems of the prior art.

In order to achieve the purpose, the invention provides the following technical scheme: the heating device comprises a heating cylinder fixedly mounted on one side of the top of a mounting plate through a support frame, a motor is fixedly mounted in the middle of the side wall of one side of the heating cylinder through a support frame, an output shaft of the motor is fixedly sleeved with a rotating shaft, one end, far away from the motor, of the rotating shaft penetrates through the side wall of the heating cylinder and extends to the inside of the heating cylinder, and a propeller blade is fixedly welded on the surface, extending to the inside of the heating cylinder, of the rotating shaft; the shunting block is fixedly inserted at one end of the heating cylinder, which is far away from the motor; the inner part of the shunting block is provided with a plurality of shunting holes; the forming mechanism is fixedly arranged at one end, far away from the heating cylinder, of the shunting block, and is fixedly arranged on the top surface of the mounting plate; the blanking mechanism comprises a feeding pipe, a blanking box, a fixed shaft, a stirring rod, a blanking pipe and a servo motor, wherein the blanking pipe is fixedly inserted at one side edge of the heating cylinder, the blanking box is fixedly welded at the top of the blanking pipe, the feeding pipe is fixedly inserted at the top of one side of the blanking box, the servo motor is fixedly installed at the middle part of the top surface of the blanking box through a mounting seat, the fixed shaft is fixedly sleeved at an output shaft of the servo motor, the bottom of the fixed shaft penetrates through the top of the blanking box and extends into the blanking box, and the stirring rod is fixedly welded at two sides of the fixed shaft extending into the blanking box; heating mechanism, heating mechanism includes air exhauster, heating cabinet, heating rod, conveyer pipe and fresh air inlet, the fixed welding of one side lateral wall of unloading case has the heating cabinet, the inner wall top of heating cabinet is located between two parties and is had the air exhauster through bolt fixed mounting, the fresh air inlet has been seted up to one side that the unloading case was kept away from to the heating cabinet, there is the heating rod bottom one side of the inner wall of heating cabinet and keeping away from the air exhauster through bolt fixed mounting, the fixed grafting of department is located between two parties in the bottom of heating cabinet has the conveyer pipe, the one end that the heating cabinet was kept away from to the conveyer pipe is fixed to be peg.

The top of the feeding pipe is rotatably connected with a sealing cover, and a valve is fixedly arranged in the discharging pipe and positioned on one side of the bottom of the conveying pipe.

The inner thread of the air inlet hole is inserted with a fixing frame, and a second filter screen is fixedly welded at one end, far away from the heating box, of the fixing frame.

Wherein, fixed mounting has dry layer between the inner wall of fixed frame, dry layer includes air vent, drier and dry frame, the inner wall of fixed frame and the one end threaded connection who keeps away from the second filter screen have dry frame, a plurality of air vents have all been seted up to the both sides of dry frame, the intussuseption of dry frame is filled with the drier.

The side wall of the blanking box is fixedly sleeved with a second heat insulation sleeve, the top of one side of the blanking box is fixedly inserted with a heat insulation pipe, and the heat insulation pipe penetrates through the second heat insulation sleeve and extends to the outside of the second heat insulation sleeve.

The heat preservation pipe is located inside the second heat preservation and is of a spiral structure, and a first filter screen is fixedly welded at one end of the heat preservation pipe located inside the blanking box.

Wherein, the one end fixed mounting that the motor was kept away from to the axis of rotation has anti-overflow mechanism, anti-overflow mechanism includes electric putter, fixed plate, sealed head and connecting rod, the one end fixed weld that the motor was kept away from to the axis of rotation has electric putter, the one end fixed weld that electric putter kept away from the axis of rotation has the fixed plate, the one end fixed weld that electric putter was kept away from to the fixed plate has the connecting rod, the one end fixed weld that the fixed plate was kept away from to the connecting rod has the sealed head with reposition of redundant.

The sealing head is of a circular truncated cone structure, and one side of the shunt hole adjacent to the heating cylinder is of a micro-loudspeaker shape matched with the sealing head.

The surface of the shunting block is fixedly sleeved with a first heat-insulating sleeve, and a heating pipe is arranged in the first heat-insulating sleeve.

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

1. the plastic particles are poured into the lower material box through the feeding pipe, then the feeding pipe is sealed by a sealing cover, then the servo motor and the exhaust fan are started, the exhaust fan pumps the outside air into the heating box through the air inlet hole, then the plastic particles are heated by a heating rod and then conveyed into the blanking box through a conveying pipe to preheat the plastic particles in the blanking box, meanwhile, the servo motor drives the stirring rod to rotate through the fixed shaft, so that the plastic particles can be uniformly preheated and dried, and the gas conveyed to the heating by the conveying pipe enters the blanking box from the bottom of the blanking box, so that the problem of uneven preheating caused by dead angle generated by sedimentation of local plastic particles can be avoided, thereby carry out even heating with plastic granules in the inside of blanking box to it is effectual to make plastic granules melt after getting into heating cylinder inside, has improved the plastics shaping effect.

2. The gas in the blanking box can flow out of the heat preservation pipe and enter the second heat preservation sleeve, so that the blanking box can be insulated, and the heat loss in the blanking box can be effectively reduced.

3. After the raw materials after preheating get into the inside of cartridge heater, the starter motor, make the motor drive the axis of rotation and rotate, the fixed axle drives propeller blade and promotes the inside raw materials of cartridge heater to shunting piece one side, the raw materials takes place the melting plastify under the effect of cartridge heater in promoting the in-process, then get into the inside of forming mechanism through the shunting hole with the plastics liquid of molten state, after the injection is accomplished, start electric putter, make electric putter get into and drive the fixed plate and remove to the one side that is close to the shunting piece, the fixed plate drives sealed head through the connecting rod and seals the shunting hole, avoid the inside liquid of forming mechanism to take place the problem of backward flow, thereby avoid the local defective problem of shaping product.

4. The plastic raw materials are shunted through the shunt hole, and the multi-runner is conveyed, so that the problem of uneven filling is avoided, and the plastic forming effect is further improved.

Drawings

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

FIG. 2 is an enlarged view of the structure at A in FIG. 1 according to the present invention;

FIG. 3 is a schematic structural view of a blanking mechanism according to the present invention;

FIG. 4 is a schematic view of the internal structure of the fixing frame according to the present invention;

FIG. 5 is a schematic view of the structure of the drying layer of the present invention.

In the figure: 1-mounting a plate; 2-a forming mechanism; 3-a shunting block; 4-a first heat preservation sleeve; 5-heating the tube; 6-a blanking mechanism; 61-feed pipe; 62-blanking box; 63-a heat preservation pipe; 64-a fixed shaft; 65-a second insulating sleeve; 66-a stirring rod; 67-a blanking pipe; 68-a servo motor; 69-a first filter; 7-a conveying mechanism; 71-heating a cartridge; 72-propeller blades; 73-a motor; 74-rotating shaft; 8-anti-overflow mechanism; 81-electric push rod; 82-a fixing plate; 83-sealing head; 84-a connecting rod; 9-a heating mechanism; 91-an exhaust fan; 92-a heating box; 93-a fixed frame; 94-a heating rod; 95-a delivery pipe; 96-drying layer; 961-a vent; 962-drying agent; 963-drying frame; 97-a second filter; 10-a shunt hole.

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.

The first embodiment is as follows:

referring to fig. 1-5, the present invention provides a technical solution: a multi-runner plastic injection molding machine, a mounting plate 1; the conveying mechanism 7 comprises a heating cylinder 71, a propeller blade 72, a motor 73 and a rotating shaft 74, wherein the heating cylinder 71 is fixedly mounted on one side of the top of the mounting plate 1 through a support frame, the motor 73 is fixedly mounted in the center of the side wall of one side of the heating cylinder 71 through a support, the rotating shaft 74 is fixedly sleeved on an output shaft of the motor 73, one end, far away from the motor 73, of the rotating shaft 74 penetrates through the side wall of the heating cylinder 71 and extends into the heating cylinder 71, and the propeller blade 72 is fixedly welded on the surface of the rotating shaft 74 extending into the heating cylinder 71; the shunting block 3 is fixedly inserted at one end of the heating cylinder 71 far away from the motor 73; the inner part of the shunting block 3 is provided with a plurality of shunting holes 10; the molding mechanism 2 is fixedly installed at one end, away from the heating cylinder 71, of the shunting block 3, and the molding mechanism 2 is fixedly installed on the top surface of the installation plate 1; the blanking mechanism 6 comprises a feeding pipe 61, a blanking box 62, a fixed shaft 64, a stirring rod 66, a blanking pipe 67 and a servo motor 68, the blanking pipe 67 is fixedly inserted at one side edge of the heating cylinder 71, the blanking box 62 is fixedly welded at the top of the blanking pipe 67, the feeding pipe 61 is fixedly inserted at the top of one side of the blanking box 62, the servo motor 68 is fixedly installed at the center of the top surface of the blanking box 62 through a mounting seat, the fixed shaft 64 is fixedly sleeved at an output shaft of the servo motor 68, the bottom of the fixed shaft 64 penetrates through the top of the blanking box 62 and extends to the inside of the blanking box 62, and the stirring rod 66 is fixedly welded at two sides of the fixed shaft 64 extending to the inside of the blanking box 62; heating mechanism 9, heating mechanism 9 includes air exhauster 91, heating cabinet 92, heating rod 94, conveyer pipe 95 and fresh air inlet, one side lateral wall fixed weld of workbin 62 has heating cabinet 92, the department located between two parties of the inner wall top of heating cabinet 92 has air exhauster 91 through bolt fixed mounting, the fresh air inlet has been seted up to one side that workbin 62 was kept away from to heating cabinet 92, the bottom one side of air exhauster 91 is kept away from to the inner wall of heating cabinet 92 has heating rod 94 through bolt fixed mounting, the fixed grafting of department located between two parties of bottom of heating cabinet 92 has conveyer pipe 95, the one end that heating cabinet 92 was kept away from to conveyer pipe 95 is fixed grafting with one side of unloading pipe 67, the top of inlet pipe 61 is rotated and is connected with sealed lid, and the inside of unloading pipe 67 and the bottom one side fixed mounting that is located conveyer pipe 95 have the valve, close the valve, pour the inside of workbin 62 with, then the feeding pipe 61 is sealed by using a sealing cover, then the servo motor 68 and the exhaust fan 91 are started, the exhaust fan 91 pumps outside air into the heating box 92 through an air inlet hole, then the air is conveyed into the blanking box 62 through the conveying pipe 95 after being heated by the heating rod 94, plastic particles in the blanking box 62 are preheated, meanwhile, the servo motor 68 drives the stirring rod 66 to rotate through the fixing shaft 64, the plastic particles can be uniformly preheated and dried, and the heated air conveyed by the conveying pipe 95 enters the blanking box 62 from the bottom of the blanking box 62, so that the problem of nonuniform preheating caused by dead angles generated by the sedimentation of local plastic particles can be avoided, the plastic particles are uniformly heated in the blanking box 62, the plastic particles are enabled to have good melting effect after entering the heating cylinder 71, and the plastic molding effect is improved, after the preheated raw material enters the heating cylinder 71, the motor 73 is started, so that the motor 73 drives the rotating shaft 74 to rotate, the fixed shaft 74 drives the screw blade 72 to push the raw material in the heating cylinder 71 to one side of the shunting block 3, the raw material is melted and plasticized under the action of the heating cylinder 71 in the pushing process, and then the molten plastic liquid enters the forming mechanism 2 through the shunting hole 10.

Example two:

as a preferable scheme of the first embodiment, a fixing frame 93 is inserted into the inner threads of the air inlet, a second filter screen 97 is fixedly welded at one end of the fixing frame 93, which is far away from the heating box 92, a drying layer 96 is fixedly installed between the inner walls of the fixing frame 93, the drying layer 96 includes a vent hole 961, a drying agent 962 and a drying frame 963, the drying frame 963 is connected to the inner wall of the fixing frame 93 and the end of the fixing frame 93, which is far away from the second filter screen 97, through the threads, a plurality of vent holes 961 are respectively formed on both sides of the drying frame 963, the drying agent 962 is filled in the drying frame 963, a second thermal insulation sleeve 65 is fixedly sleeved on the side wall of the lower box 62, a thermal insulation pipe 63 is fixedly inserted into the top of one side of the lower box 62, the thermal insulation pipe 63 penetrates through the second thermal insulation sleeve 65 and extends to the outside of the second thermal insulation sleeve 65, and the, the area inside the second heat insulation sleeve 65 is increased, the heat insulation effect is improved, the first filter screen 69 is fixedly welded at one end, located inside the lower box 62, of the heat insulation pipe 63, the air entering the heating box 92 firstly intercepts external dust through the second filter screen 97, then is dried through the drying layer 96, enters the drying frame 963 through the vent holes 961, enters the air through the drying agent 962 for drying, and then flows out of the vent holes 961 at the other side, so that the dust and moist air are prevented from being attached to the surface of the heating rod 94, the service life of the heating rod 94 is shortened, the air inside the lower box 6 can flow out of the heat insulation pipe 63, plastic particles can be intercepted through the first filter screen 69, the blockage of the heat insulation pipe caused by the fact that the plastic particles enter the heat insulation pipe 63 is avoided, and the air enters the inside of the second heat insulation sleeve 65 through the heat insulation pipe 63, can keep warm with blanking box 62, can effectual limit the inside heat loss of blanking box 62.

Example three:

as a preferred scheme of the first embodiment, an anti-overflow mechanism 8 is fixedly mounted at one end of the rotating shaft 74 far away from the motor 73, the anti-overflow mechanism 8 includes an electric push rod 81, a fixing plate 82, a sealing head 83 and a connecting rod 84, the one end of the rotating shaft 74 far away from the motor 73 is fixedly welded with the electric push rod 81, the one end of the electric push rod 81 far away from the rotating shaft 74 is fixedly welded with the fixing plate 82, the one end of the fixing plate 82 far away from the electric push rod 81 is fixedly welded with the connecting rod 84, the one end of the connecting rod 84 far away from the fixing plate 82 is fixedly welded with the sealing head 83 adapted to the diversion hole 10, the sealing head 83 is of a circular truncated cone structure, one side of the diversion hole 10 adjacent to the heating cylinder 71 is in a micro-horn shape adapted to the sealing head 83, the sealing effect is good, the surface of the, the inside of first heat preservation cover 4 is provided with heating pipe 5, start-up heating pipe 5, can heat reposition of redundant personnel piece 3, avoid liquid in the inside problem of condensing of taking place of reposition of redundant personnel hole 10, after the injection is accomplished, start electric putter 81, make electric putter 81 get into and drive fixed plate 82 and remove to the one side that is close to reposition of redundant personnel piece 3, fixed plate 82 drives sealed head 83 through connecting rod 84 and seals reposition of redundant personnel hole 10, avoid the inside liquid of forming mechanism 2 to take place the problem of backward flow, thereby avoid the local defective problem of shaping product.

The working principle is as follows: when the plastic particle preheating device is used, the valve is closed, plastic particles are poured into the lower box 62 through the feeding pipe 61, the feeding pipe 61 is sealed through the sealing cover, the servo motor 68 and the exhaust fan 91 are started, the exhaust fan 91 pumps outside air into the heating box 92 through the air inlet hole, the air is heated through the heating rod 94 and then is conveyed into the lower box 62 through the conveying pipe 95, the plastic particles in the lower box 62 are preheated, meanwhile, the servo motor 68 drives the stirring rod 66 to rotate through the fixing shaft 64, uniform preheating and drying can be carried out on the plastic particles, heated air is conveyed through the conveying pipe 95 to enter the lower box 62 from the bottom of the lower box 62, the problem that local plastic particles are settled to generate dead corners and cause uneven preheating can be avoided, and therefore the plastic particles are uniformly heated in the lower box 62, thereby ensuring good melting effect of the plastic particles after entering the heating cylinder 71, improving the plastic molding effect, opening the valve, after the preheated raw material enters the heating cylinder 71, the motor 73 is started, so that the motor 73 drives the rotating shaft 74 to rotate, the fixed shaft 74 drives the screw blade 72 to push the raw material in the heating cylinder 71 to one side of the shunting block 3, the raw material is melted and plasticized under the action of the heating cylinder 71 in the pushing process, then the plastic liquid in the molten state enters the inside of the molding mechanism 2 through the diversion hole 10, after the injection is finished, the electric push rod 81 is started, the electric push rod 81 is driven to drive the fixing plate 82 to move towards one side close to the shunting block 3, the fixing plate 82 drives the sealing head 83 to seal the shunting hole 10 through the connecting rod 84, the problem that liquid inside the forming mechanism 2 flows back is avoided, and therefore the problem that the formed product is partially defective is avoided.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

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. A multi-runner plastic injection molding machine comprising:

a mounting plate (1);

the conveying mechanism (7) comprises a heating cylinder (71), propeller blades (72), a motor (73) and a rotating shaft (74), the heating cylinder (71) is fixedly mounted on one side of the top of the mounting plate (1) through a support frame, the motor (73) is fixedly mounted in the middle of the side wall of one side of the heating cylinder (71) through a support, the rotating shaft (74) is fixedly sleeved on an output shaft of the motor (73), one end, far away from the motor (73), of the rotating shaft (74) penetrates through the side wall of the heating cylinder (71) and extends into the heating cylinder (71), and the propeller blades (72) are fixedly welded on the surface, extending into the heating cylinder (71), of the rotating shaft (74);

the shunting block (3) is fixedly inserted at one end, far away from the motor (73), of the heating cylinder (71);

the inner part of the shunting block (3) is provided with a plurality of shunting holes (10);

the molding mechanism (2) is fixedly installed at one end, away from the heating cylinder (71), of the shunting block (3), and the molding mechanism (2) is fixedly installed on the top surface of the mounting plate (1);

the blanking mechanism (6), the blanking mechanism (6) comprises a feeding pipe (61), a blanking box (62), a fixed shaft (64), a stirring rod (66), a blanking pipe (67) and a servo motor (68), a discharging pipe (67) is fixedly inserted at one side edge of the heating cylinder (71), the top of the blanking pipe (67) is fixedly welded with a blanking box (62), the top of one side of the blanking box (62) is fixedly inserted with a feeding pipe (61), a servo motor (68) is fixedly arranged at the center of the top surface of the blanking box (62) through a mounting seat, the output shaft of the servo motor (68) is fixedly sleeved with a fixed shaft (64), the bottom of the fixed shaft (64) penetrates through the top of the blanking box (62) and extends to the interior of the blanking box (62), stirring rods (66) are fixedly welded on two sides of the fixed shaft (64) extending into the blanking box (62);

heating mechanism (9), heating mechanism (9) include air exhauster (91), heating cabinet (92), heating rod (94), conveyer pipe (95) and fresh air inlet, one side lateral wall fixed weld of workbin (62) has heating cabinet (92), the inner wall top of heating cabinet (92) is located centrally there is air exhauster (91) through bolt fixed mounting, the fresh air inlet has been seted up to one side that workbin (62) was kept away from in heating cabinet (92), there is heating rod (94) through bolt fixed mounting in bottom one side of air exhauster (91) and keeping away from the inner wall of heating cabinet (92), the fixed grafting of department located centrally in the bottom of heating cabinet (92) has conveyer pipe (95), the one end that heating cabinet (92) were kept away from in conveyer pipe (95) is fixed to be pegged graft with one side of unloading pipe (67).

2. A multi-runner plastic injection molding machine as claimed in claim 1, wherein: the top of the feeding pipe (61) is rotatably connected with a sealing cover, and a valve is fixedly arranged inside the discharging pipe (67) and on one side of the bottom of the conveying pipe (95).

3. A multi-runner plastic injection molding machine as claimed in claim 1, wherein: the internal thread of the air inlet hole is inserted with a fixing frame (93), and a second filter screen (97) is fixedly welded at one end, far away from the heating box (92), of the fixing frame (93).

4. A multi-runner plastic injection molding machine as claimed in claim 3, wherein: a drying layer (96) is fixedly installed between the inner walls of the fixing frame (93), the drying layer (96) comprises vent holes (961), drying agents (962) and a drying frame (963), one end, far away from the second filter screen (97), of the inner wall of the fixing frame (93) is in threaded connection with the drying frame (963), a plurality of vent holes (961) are formed in two sides of the drying frame (963), and the drying agents (962) are filled in the drying frame (963).

5. A multi-runner plastic injection molding machine as claimed in claim 1, wherein: the side wall of the blanking box (62) is fixedly sleeved with a second heat insulation sleeve (65), the top of one side of the blanking box (62) is fixedly inserted with a heat insulation pipe (63), and the heat insulation pipe (63) penetrates through the second heat insulation sleeve (65) and extends to the outside of the second heat insulation sleeve (65).

6. A multi-runner plastic injection molding machine as claimed in claim 5, wherein: the insulating tube (63) is located the inside of second insulation cover (65) and is the spiral structure, and insulating tube (63) is located the inside one end fixed welding of workbin (62) and has first filter screen (69).

7. A multi-runner plastic injection molding machine as claimed in claim 1, wherein: one end fixed mounting that motor (73) were kept away from in axis of rotation (74) has anti-overflow mechanism (8), anti-overflow mechanism (8) include electric putter (81), fixed plate (82), sealed head (83) and connecting rod (84), the one end fixed welding that motor (73) were kept away from in axis of rotation (74) has electric putter (81), the one end fixed welding that axis of rotation (74) was kept away from in electric putter (81) has fixed plate (82), the one end fixed welding that electric putter (81) were kept away from in fixed plate (82) has connecting rod (84), the one end fixed welding that fixed plate (82) were kept away from in connecting rod (84) has sealed head (83) with reposition of redundant personnel hole (10) looks adaptation.

8. A multi-runner plastic injection molding machine as claimed in claim 7, wherein: the sealing head (83) is of a circular truncated cone structure, and one side, adjacent to the heating cylinder (71), of the diversion hole (10) is in a micro-loudspeaker shape matched with the sealing head (83).

9. A multi-runner plastic injection molding machine as claimed in claim 1, wherein: a first heat-insulating sleeve (4) is fixedly sleeved on the surface of the shunting block (3), and a heating pipe (5) is arranged inside the first heat-insulating sleeve (4).