CN118990934A

CN118990934A - Injection molding device for plastic connector of resistance magnesium rod

Info

Publication number: CN118990934A
Application number: CN202411093479.8A
Authority: CN
Inventors: 凌峰; 叶则华
Original assignee: Huaian Kangjier Anticorrosion Technology Co ltd
Current assignee: Huaian Kangjier Anticorrosion Technology Co ltd
Priority date: 2024-08-09
Filing date: 2024-08-09
Publication date: 2024-11-22

Abstract

The invention discloses an injection molding device for a plastic connector of a resistance magnesium rod, and specifically relates to the technical field of magnesium rod processing, comprising a rotating bracket capable of reciprocating rotation on a mounting frame, a mounting mold and a closing mold that are slidably mounted on the rotating bracket and are engaged with each other, limiting components are mounted on both sides of the rotating bracket, an annular slide is fixedly mounted on the rotating bracket, the outer peripheral walls of the mounting mold and the closing mold are fixedly connected with injection pipes, the inner peripheral wall of the annular slide is fixedly connected with two connecting pipes respectively sleeved on the inner peripheral walls of the two injection pipes, a ring is rotatably mounted on the outer peripheral wall of the annular slide, and both sides of the ring are fixedly connected with injection molding mechanisms; the application installs the joint element of the magnesium rod between the closing mold and the mounting assembly on the rotating bracket, and after the plastic solution is filled in the cavity formed between the closing mold and the mounting mold, the rotating bracket is prompted to rotate reciprocally, thereby prompting the plastic solution to flow, so as to improve the uniformity and production efficiency of the product.

Description

Injection molding device for plastic connector of resistance magnesium rod

Technical Field

The invention relates to the technical field of magnesium rod processing, in particular to an injection molding device for a plastic connector of a resistance magnesium rod.

Background

In modern manufacturing, injection molding technology is a widely used process, particularly in the production of plastic articles. The manufacture of plastic housings at the joints of magnesium rods is a typical application case.

Patent publication number CN210267745U discloses a magnesium rod joint device, comprising a first conductor connected with a magnesium rod, a second conductor and a plastic shell wrapping the first conductor and the second conductor, wherein the end part of the second conductor extends out of the plastic shell; one end of the first conductor is provided with a fixing hole connected with the magnesium rod, the first conductor is electrically connected with the second conductor, the first conductor and the second conductor are embedded in the plastic shell, and the plastic shell wraps the outer peripheral surface of the first conductor. Can be used for injection molding in a horizontal injection molding machine, can be suitable for magnesium rods of different types, and is convenient to replace parts during maintenance.

According to the technology, the structure shape of the magnesium rod joint, which is required to be protected by the plastic shell, is complex, and the plastic solution can encounter the problem of uneven flow resistance during injection molding, so that the uniformity and consistency of the whole product are affected, and the production efficiency is improved.

Disclosure of Invention

The invention aims to provide an injection molding machine for producing a magnesium resistor rod, which improves the fluidity of a plastic solution, improves the production efficiency, reduces bubbles in the solution and improves the quality of a plastic shell.

The technical problems solved by the invention are as follows: 1. when the plastic solution meets a complex structure and is subjected to injection molding, the fluidity is poor, and the production efficiency is low;

2. Air is easy to be trapped in the injection molding process of the plastic solution, air bubbles are formed, and after the plastic solution is cooled, the air bubbles become gaps, so that the quality of a product can be influenced.

The invention can be realized by the following technical scheme: including the runing rest of rotation installation on the mounting bracket, the drive mechanism that makes the reciprocal pivoted of runing rest is all installed to the mounting bracket both sides, run through slidable mounting on the runing rest and have mutual joint complex installing die and closed mould, the spacing subassembly that makes installing die and closed mould move in opposite directions is all installed to the runing rest both sides, fixed mounting has annular slide on the runing rest, the installation die corresponds the equal fixed intercommunication in position department of annular slide with closed mould perisporium and has the injection pipe, annular slide perisporium fixed intercommunication has two overlaps respectively to establish the connecting pipe at two injection pipe perisporium, annular slide perisporium rotates and installs the ring, the ring perisporium corresponds the equal fixed intercommunication in position department of two connecting pipes and has injection mechanism.

The invention further technically improves that: one side of the mounting die is in threaded connection with a limit bolt matched with the fixing hole of the joint element, and the other side of the mounting die is provided with a threaded hole matched with the rod body of the joint element bolt.

Further, the transmission mechanism comprises a first gear fixedly arranged at one end of a rotating shaft of the rotating support, a first rack plate meshed with the first gear is slidably arranged at one side of the mounting frame, a sliding groove plate is fixedly arranged at the bottom of the first rack plate, the rotating plate is rotatably arranged at one side, close to the sliding groove plate, of the mounting frame, a driving motor for driving the rotating plate to rotate is fixedly arranged on the mounting frame, a pressure switch is fixedly arranged at one side, close to the driving motor, of the mounting frame, and the pressure switch is electrically connected with the driving motor.

Further, the limiting component comprises a rotating drum which is installed by rotating the peripheral wall of a rotating support rotating shaft, limiting rods are installed on the peripheral wall of the rotating drum in a penetrating and sliding mode, limiting grooves are formed in the positions, corresponding to the limiting rods, of the two sides of the peripheral wall of the rotating support rotating shaft, the limiting rods are matched with the limiting grooves in a clamping mode, springs which are sleeved on the peripheral wall of the limiting rods are fixedly installed between one ends, extending to the outer side of the rotating drum, of the limiting rods, two first push-pull plates which are symmetrical in center are fixedly installed on the peripheral wall of the rotating drum, one ends, far away from the rotating drum, of the two first push-pull plates are rotatably installed, and one ends, far away from the first push-pull plates, of the two first connecting plates are respectively connected with a mounting die and a closing die in a rotating mode.

Further, one end of the limiting rod extending to the inner side of the rotary drum is spherically arranged, and one end of the limiting groove extending to the inner side of the rotary drum is matched with one end of the limiting rod extending to the inner side of the rotary drum.

Further, the injection molding mechanism comprises an injection molding barrel fixedly mounted at the position, close to the ring, on the mounting frame, an injection molding nozzle of the injection molding barrel is fixedly communicated with the peripheral wall of the ring, a feeding box is fixedly communicated with the top of the peripheral wall of the injection molding barrel, and a screw rod is installed in a penetrating and rotating mode in an inner cavity of the injection molding barrel.

Further, the position department that corresponds two injection molding barrel below on the mounting bracket runs through the rotation and installs the bull stick that is parallel to each other with the screw rod, and the mounting bracket bottom corresponds the position department between two pressure switch and all slidable mounting has rack board two, and rack board two ends correspond the position department of pressure switch and all fixed mounting has the stripper plate, and bull stick peripheral wall fixed mounting has with rack board two engaged gear two.

Further, the rotating rod and the two screws are driven by the belt wheel.

Further, the position department that the mounting bracket both sides are close to the section of thick bamboo of moulding plastics is all fixed mounting has a piston cylinder, and piston cylinder top and the injection molding mouth fixed intercommunication of section of thick bamboo of moulding plastics, and piston cylinder bottom runs through slidable mounting and has the piston rod, and piston rod bottom fixed mounting has the lifter plate, and the lifter plate both sides are all rotated and are installed push-and-pull plate two, and two push-and-pull plate two keep away from the one end of lifter plate and rotate with the both sides of injection pipe respectively and be connected.

Further, a first check valve for injecting the air in one direction into the injection nozzle is arranged between the piston cylinder and the injection nozzle, and a second check valve for injecting the air in one direction into the piston cylinder is arranged on the piston cylinder.

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

1. According to the application, the joint element of the magnesium rod is arranged on the mounting die, then the mounting die and the closing die are clamped together to form the cavity for injection molding of the joint element, and then the plastic solution is continuously injected into the cavity until the cavity is full, so that the driving motor for driving the rotating bracket to rotate in a reciprocating manner is just started, and the rotating bracket drives the closing die and the mounting die to rotate, thereby promoting the flow of the plastic solution between the two, improving the uniformity of products and improving the production efficiency.

2. According to the application, when the rotating bracket rotates reciprocally, the plastic solution injected into the cavity between the closed die and the mounting die is continuously converted into intermittent injection so as to compensate bubbles in the plastic solution, and the plastic solution is subjected to pressure maintaining treatment, so that the plastic quality is firmer.

3. When the closed die is separated from the mounting die, air is injected into the piston cylinder, and then the air stored in the piston cylinder is discharged into an injection nozzle, a connecting pipe and an injection pipe which are connected with the piston cylinder when the closed die is combined, so that plastic solution residues in the connecting pipe and the injection pipe are discharged, and cooling solidification of the plastic solution residues is prevented from blocking an injection path of the plastic solution.

Drawings

The present invention is further described below with reference to the accompanying drawings for the convenience of understanding by those skilled in the art.

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

FIG. 2 is a schematic view of another view overall structure of the present invention;

FIG. 3 is a schematic view of a spacing assembly of the present invention shown in isolation;

FIG. 4 is an enlarged view of a portion of the invention at A in FIG. 1;

FIG. 5 is a side cross-sectional view of the overall structure of the present invention;

FIG. 6 is a front cross-sectional view of the overall structure of the present invention;

Fig. 7 is a partial enlarged view of the present invention at B in fig. 6.

In the figure: 1. a mounting frame; 2. rotating the bracket; 3. installing a die; 4. closing the mould;

5. A limit component; 51. a rotating drum; 52. a limit rod; 53. a limit groove; 54. a spring; 55. a push-pull plate I; 56. a first connecting plate;

6. A limit bolt; 7. a threaded hole; 8. an annular slideway; 9. an injection tube; 10. a connecting pipe; 11. a loop; 12. an injection molding cylinder; 13. a charging box; 14. a screw; 15. a rotating rod; 16. a first gear; 17. rack plate I; 18. a chute plate; 19. a rotating plate; 20. a driving motor; 21. a pressure switch; 22. rack plate II; 221. an extrusion plate; 23. a second gear; 24. a piston cylinder; 25. a piston rod; 26. a lifting plate; 27. and a second push-pull plate.

Detailed Description

In order to further describe the technical means and effects adopted by the invention for achieving the preset aim, the following detailed description is given below of the specific implementation, structure, characteristics and effects according to the invention with reference to the attached drawings and the preferred embodiment.

Referring to fig. 1-2 and fig. 6-7, the embodiment provides an injection molding device for a plastic connector of a magnesium resistor rod, which comprises a mounting frame 1, wherein a rotating bracket 2 is rotatably installed on the mounting frame 1, a mounting die 3 and a closing die 4 are installed on the rotating bracket 2 in a penetrating and sliding manner, a groove body is formed on one side of the mounting die 3 corresponding to the closing die 4, a bulge matched with the groove body is fixedly installed on one side of the closing die 4 corresponding to the mounting die 3, the mounting die 3 and the closing die 4 are matched with the groove body in a clamping manner through the bulge, limit components 5 for promoting the mounting die 3 and the closing die 4 to move towards each other are installed on two sides of the rotating bracket 2, limit bolts 6 matched with fixing holes of a connector element are connected on one side of the mounting die 3 in a threaded manner, threaded holes 7 matched with the rod bodies of the connector element bolts are formed on the other side of the mounting die 3, annular slide ways 8 are fixedly installed on the rotating bracket 2, injection pipes 9 are fixedly communicated with the positions of the mounting die 3 and the outer peripheral walls of the closing die 4 corresponding to the annular slide ways 8, connecting pipes 10 are fixedly communicated with the positions of the inner peripheral walls of the two injection pipes 9, and the connecting pipes 10 are connected with the injection pipes in a penetrating and sliding manner.

The rod body of the bolt of the joint element is connected in the threaded hole 7 of the installation mould 3 in a threaded manner, then the fixing hole of the joint element is aligned with the limit bolt 6 on the installation mould 3, then the limit bolt 6 is rotated clockwise, the rod body of the limit bolt 6 is rotated into the fixing hole of the joint element, so that the joint element is fixed firmly on the installation mould 3, then the installation mould 3 and the closing mould 4 are mutually close, after the two are clamped and matched together, plastic solution can be injected into a cavity between the closing mould 4 and the installation mould 3 through the connecting pipe 10 and the injection pipe 9, after the joint element is injected and the plastic solution is cooled and molded, the closing mould 4 and the installation mould 3 are mutually far away, then the limit bolt 6 is rotated anticlockwise, so that the rod body of the limit bolt 6 is rotated out of the fixing hole on the joint element, and then the rod body of the upper bolt of the joint element is rotated out of the threaded hole 7, and the joint of the injection molded magnesium rod can be taken out of the installation mould 3;

The outer peripheral wall of the annular slideway 8 is rotationally provided with a ring 11, injection molding barrels 12 are fixedly arranged at positions, corresponding to the rings 11, of two sides of the mounting frame 1, the two injection molding barrels 12 are fixedly communicated with positions, corresponding to the two connecting pipes 10, of the outer peripheral wall of the ring 11, injection molding nozzles of the two injection molding barrels 12 are simultaneously fixedly communicated with the outer peripheral wall of the ring 11, a heating ring (not shown in the figure) for heating the inner cavity of the injection molding barrel 12 is arranged on the injection molding barrel 12, the top of the outer peripheral wall of the injection molding barrel 12 is fixedly communicated with a feeding box 13, a screw 14 is rotatably arranged in the inner cavity of the injection molding barrel 12 in a penetrating manner, a rotating rod 15 parallel to the screw 14 is rotatably arranged in the position, corresponding to the lower part of the two injection molding barrels 12, of the mounting frame 1 is provided with a servo motor (not shown in the figure) for driving the rotation of the rotating rod 15, and the rotating rod 15 and the two screws 14 are all in transmission through pulleys;

Putting plastic particles into a feeding box 13, enabling the plastic particles to enter an injection molding cylinder 12 through the feeding box 13, then enabling a rotating rod 15 to rotate so as to synchronously drive two screws 14 to rotate, enabling the screws 14 to stir the plastic particles in the injection molding cylinder 12 to match with a heating ring in the plastic cylinder, stirring the plastic particles into a molten state, and enabling a plastic solution to sequentially pass through an injection nozzle, a connecting pipe 10 and an injection pipe 9 to be led into a cavity between a closed die 4 and an installation die 3 by the rotating screws 14, so that the butt joint element is subjected to injection molding;

Referring to fig. 1-3, the limiting assembly 5 includes a rotating drum 51 rotatably mounted on the outer peripheral wall of the rotating shaft of the rotating bracket 2, a limiting rod 52 is slidably mounted on the outer peripheral wall of the rotating drum 51 in a penetrating manner, one end of the limiting rod 52 extending to the inner side of the rotating drum 51 is spherically arranged, limiting grooves 53 adapted to one end of the limiting rod 52 extending to the inner side of the rotating drum 51 are formed in both sides of the outer peripheral wall of the rotating shaft of the rotating bracket 2, the limiting rod 52 is in clamping fit with the limiting grooves 53, a spring 54 sleeved on the outer peripheral wall of the limiting rod 52 is fixedly mounted between one end of the limiting rod 52 extending to the outer side of the rotating drum 51 and the rotating drum 51, two first push-pull plates 55 are fixedly mounted on the outer peripheral wall of the rotating drum 51, one ends of the two first push-pull plates 55, which are far away from the inner sides of the first push-pull plates 55, are rotatably mounted with a connecting plate 56, and one end of the two connecting plates 55, which are far away from the first push-pull plates 55, are rotatably connected with the mounting mold 3 and the closing mold 4 respectively;

The rotary drum 51 is rotated clockwise, so that the two first push-pull plates 55 drive the closing die 4 and the mounting die 3 to be close to each other through the two first connecting plates 56, and are away from each other, when the limiting rod 52 is driven by the rotary drum 51 to be separated from the limiting groove 53 through rotation of the rotary drum 51, the outer peripheral wall of the rotating shaft of the rotary bracket 2 can extrude one end of the limiting rod 52 extending into the rotary drum 51, so that the other end of the limiting rod 52 stretches the spring 54, the spring 54 is in a stressed state, and when the limiting rod 52 is driven to move into the limiting groove 53 again under rotation of the rotary drum 51, the stressed spring 54 drives the limiting rod 52 to extrude inwards of the rotary drum 51, so that one end of the limiting rod 52 extending into the inner side of the rotary drum 51 is clamped in the limiting groove 53, and rotation of the rotary drum 51 on the rotating shaft of the rotary bracket 2 is limited through clamping fit of the limiting rod 52 and the limiting groove 53;

Referring to fig. 1-2 and fig. 5, a first gear 16 is fixedly installed at two ends of a rotating shaft of a rotating bracket 2, a first rack plate 17 meshed with the first gears 16 is slidably installed at two sides of a mounting frame 1, a chute plate 18 is fixedly installed at the bottom of the first rack plate 17, rotating plates 19 are rotatably installed at positions corresponding to the chute plates 18 at two sides of the mounting frame 1, two driving motors 20 respectively driving the two rotating plates 19 to rotate are fixedly installed on the mounting frame 1, pressure switches 21 are fixedly installed at positions, adjacent to the two driving motors 20, of the mounting frame 1, the two pressure switches 21 are respectively electrically connected with the two driving motors 20, a second rack plate 22 is slidably installed at positions, corresponding to the pressure switches 21, at two ends of the second rack plate 22, of a squeezing plate 221 is fixedly installed at positions corresponding to the pressure switches 21, and a second gear 23 meshed with the second rack plate 22 is fixedly installed at the peripheral wall of the rotating rod 15;

When the rotary rod 15 rotates clockwise, the rack plate II 22 is driven to move towards one of the pressure switches 21 through the gear II 23 until the gear II 23 is separated from the meshed state with the rack plate II 22, the rack plate II 22 just drives the extruding plate 221 to move to the position of one of the pressure switches 21 and extrude the extruding plate, so that the driving motor 20 electrically connected with the pressure switch 21 is started, the rotating plate 19 driven by the driving motor 20 is driven to rotate, the rotating plate 19 drives the rack plate I17 to reciprocate left and right through the chute plate 18, the rack plate I17 drives the rotating bracket 2 to reciprocate in a certain rotation angle through the gear I16 meshed with the rack plate I17, otherwise, the rack plate II 22 is driven to move in the other direction, the other extruding plate 221 is driven to start the other driving motor 20, the other rack plate I17 is driven to reciprocate left and right through the other rotating plate 19, and the gear meshed with the rack plate I17 is driven to reciprocate in a certain rotation angle;

Referring to fig. 2, 4 and 5, piston cylinders 24 are fixedly installed at positions, adjacent to injection molding cylinders 12, on both sides of a mounting frame 1, the tops of the piston cylinders 24 are fixedly communicated with injection molding nozzles of the injection molding cylinders 12, one-way valves (not shown in the drawings) for injecting air in one direction into the injection molding nozzles are installed between the piston cylinders 24 and the injection molding nozzles, two one-way valves (not shown in the drawings) for injecting air in one direction into the piston cylinders 24 are arranged on the piston cylinders 24, piston rods 25 penetrate through the bottoms of the piston cylinders 24 in a sliding manner, lifting plates 26 are fixedly installed at the bottoms of the piston rods 25, two push-pull plates 27 are rotatably installed on both sides of the lifting plates 26, and one ends, far away from the lifting plates 26, of the two push-pull plates 27 are rotatably connected with both sides of an injection pipe 9 respectively;

In the process that the closed die 4 and the installation die 3 are mutually far away, the closed die 4 and the installation die 3 can drive the injection pipes 9 on the closed die 4 and the installation die 3 to respectively slide on the two connecting pipes 10, synchronously drive the two injection pipes 9 to mutually far away, in the process that the injection pipes 9 are mutually far away, the injection pipes 9 can drive the lifting plate 26 to vertically move downwards through the push-pull plate II 27, so that the lifting plate 26 drives the piston rod 25 to vertically move downwards along the piston cylinder 24, the piston cylinder 24 sucks gas in the air into the piston cylinder 24 through the one-way valve, otherwise, the piston rod 25 moves upwards, the gas stored in the piston cylinder 24 is unilaterally guided into an injection nozzle of the injection cylinder 12 through the other one-way valve, so that plastic solution residues in the connecting pipe 10 communicated with the injection nozzle and the injection pipes 9 are discharged through the gas, and the plastic solution residues in the connecting pipes 10 and the injection pipes 9 are prevented from being cooled and solidified in the connecting pipes 10 and the injection pipes 9, and the connecting pipes 10 and the injection pipes 9 are blocked.

When the invention is used, the joint element is accurately installed in the installation mould 3, then the closed mould 4 and the installation mould 3 are tightly clamped and matched together to form a relatively closed inner cavity, meanwhile, plastic particles are put into the two feeding boxes 13, after the rack plate II 22 is manually slid to the state that the top teeth of the rack plate II are meshed with the gear II 23, the rotating rod 15 is rotated in one direction, so that the rotating rod 15 drives the rack plate to move towards one of the pressure switches 21 through the gear II 23, simultaneously, the rotating rod 15 synchronously drives the screws 14 in the two injection cylinders 12 to rotate, so that the screws 14 are matched with the heating rings in the injection cylinders 12 to stir the plastic particles to a molten state, and molten plastic solution is continuously injected into the cavity between the closed mould 4 and the installation mould 3 through the connecting pipe 10 and the injection pipe 9, until the rack plate II 22 is separated from the meshing state with the gear II 23, the injection molding solution in the two injection molding cylinders 12 just fills the cavity between the closed mold 4 and the mounting mold 3, the rack plate just drives the extruding plate 221 to move to the position of one of the pressure switches 21 so as to start the driving motor 20 electrically connected with the pressure switch 21, the rotating bracket 2 is driven to drive the closed mold 4 and the mounting mold 3 which are clamped and matched together to reciprocally rotate along the rotating shaft of the rotating bracket 2 within a certain rotation angle, so that the plastic solution repeatedly flows in the cavity between the closed mold 4 and the mounting mold 3 to improve the uniformity of products, in the process, the annular slideway 8 which synchronously rotates with the rotating bracket 2 and the annular ring 11 fixedly communicated between the two injection molding cylinders 12 are in a relative rotation state, the communication state between the injection molding cylinder 12 and the connecting pipe 10 is intermittently blocked by the inner wall of the annular slideway 8, so that the state that the plastic solution is continuously injected between the closed die 4 and the mounting die 3 is changed into the state that the plastic solution is intermittently injected between the closed die 4 and the mounting die 3, the intermittent pressure maintaining treatment is carried out on the plastic solution filled between the closed die 4 and the mounting die 3, bubbles in the plastic solution are discharged, the product quality is ensured, and after the plastic solution injected on the joint element is cooled and solidified, the closed die 4 is separated from the mounting die 3, so that the processed product can be taken out from the mounting die 3.

The present invention is not limited in any way by the above-described preferred embodiments, but is not limited to the above-described preferred embodiments, and any person skilled in the art will appreciate that the present invention can be embodied in the form of a program for carrying out the method of the present invention, while the above disclosure is directed to various equivalent embodiments, which are capable of being modified or altered in some ways, any simple modification, equivalent variations and alterations made to the above embodiments according to the technical principles of the present invention will still fall within the scope of the technical aspects of the present invention.

Claims

1. The utility model provides a resistance magnesium stick plastic connector device of moulding plastics, includes rotation support (2) of rotation installation on mounting bracket (1), its characterized in that: the utility model discloses a rotary support, including mounting bracket (1), mounting bracket (4), injection pipe (9) are all fixed to the position department that mounting bracket (3) and closing die (4) periphery wall correspond annular slide (8), two connecting pipes (10) that overlap respectively at two injection pipe (9) inner peripheral wall are fixed to annular slide (8) inner peripheral wall intercommunication, annular slide (8) periphery wall rotate and install ring (11), ring (11) periphery wall correspond two connecting pipes (10) position department all fixed communication have injection mechanism.

2. The injection molding device for the plastic connector of the magnesium resistor rod according to claim 1, wherein one side of the installation mold (3) is in threaded connection with a limit bolt (6) matched with a fixing hole of the connector element, and the other side of the installation mold (3) is provided with a threaded hole 7 matched with a rod body of the connector element bolt.

3. The injection molding device for the plastic connector of the magnesium resistor rod according to claim 1, wherein the transmission mechanism comprises a first gear (16) fixedly arranged at one end of a rotating shaft of the rotating support (2), a first rack plate (17) meshed with the first gear (16) is slidably arranged on one side of the mounting frame (1), a sliding groove plate (18) is fixedly arranged at the bottom of the first rack plate (17), a rotating plate (19) is rotatably arranged on one side, adjacent to the sliding groove plate (18), of the mounting frame (1), a driving motor (20) for driving the rotating plate (19) to rotate is fixedly arranged on the mounting frame (1), a pressure switch (21) is fixedly arranged on one side, adjacent to the driving motor (20), of the mounting frame (1), and the pressure switch (21) is electrically connected with the driving motor (20).

4. The injection molding device for the plastic connector of the magnesium resistor rod according to claim 1, wherein the limiting component (5) comprises a rotating drum (51) which is rotatably arranged on the outer peripheral wall of a rotating shaft of a rotating bracket (2), a limiting rod (52) is arranged on the outer peripheral wall of the rotating drum (51) in a penetrating and sliding mode, limiting grooves (53) are formed in positions, corresponding to the limiting rod (52), of two sides of the outer peripheral wall of the rotating shaft of the rotating bracket (2), the limiting rod (52) is matched with the limiting grooves (53) in a clamping mode, springs (54) which are sleeved on the outer peripheral wall of the limiting rod (52) are fixedly arranged between one end, extending to the outer side of the rotating drum (51), of the limiting rod (51), two sliding plates (55) which are symmetrical to each other in a center are fixedly arranged on the outer peripheral wall of the rotating drum (51), one ends, far away from the rotating drum (51), of the two sliding plates (56) are rotatably provided with connecting plates (56), and one ends, far away from the plates (55), of the sliding plates are respectively connected with a mounting die (3) and a closing die (4) in a rotating mode.

5. The injection molding device for the plastic connector of the magnesium resistor rod according to claim 4, wherein one end of the limiting rod (52) extending to the inner side of the rotary drum (51) is spherical, and the limiting groove (53) is matched with one end of the limiting rod (52) extending to the inner side of the rotary drum (51).

6. A device for injection molding of plastic connectors of magnesium rods for resistors according to claim 3, characterized in that the injection molding mechanism comprises an injection molding barrel (12) fixedly mounted on the mounting frame (1) at a position close to the annular ring (11), an injection nozzle of the injection molding barrel (12) is fixedly communicated with the peripheral wall of the annular ring (11), a feeding box (13) is fixedly communicated with the top of the peripheral wall of the injection molding barrel (12), and a screw (14) is rotatably mounted in an inner cavity of the injection molding barrel (12).

7. The injection molding device for the plastic connector of the magnesium resistor rod according to claim 6, wherein a rotating rod (15) parallel to the screw rod (14) is installed on the mounting frame (1) in a penetrating and rotating mode at a position corresponding to the lower portion of the two injection molding cylinders (12), rack plates II (22) are slidably installed at positions corresponding to the bottom of the mounting frame (1) and between the two pressure switches (21), extruding plates (221) are fixedly installed at positions corresponding to the pressure switches (21) at two ends of the rack plates II (22), and a gear II (23) meshed with the rack plates II (22) is fixedly installed on the peripheral wall of the rotating rod (15).

8. The injection molding device for the plastic connector of the magnesium resistor rod according to claim 7, wherein the rotating rod (15) and the two screws (14) are driven by belt wheels.

9. The injection molding device for the plastic connector of the magnesium resistor rod according to claim 6, wherein piston cylinders (24) are fixedly installed at positions, close to injection molding cylinders (12), on two sides of the mounting frame (1), the tops of the piston cylinders (24) are fixedly communicated with injection molding nozzles of the injection molding cylinders (12), piston rods (25) penetrate through the bottoms of the piston cylinders (24) in a sliding mode, lifting plates (26) are fixedly installed at the bottoms of the piston rods (25), two push-pull plates (27) are rotatably installed on two sides of the lifting plates (26), and one ends, far away from the lifting plates (26), of the two push-pull plates (27) are rotatably connected with two sides of an injection pipe (9) respectively.

10. The injection molding device for the plastic connector of the magnesium resistor rod according to claim 9, wherein a first check valve for injecting the air in one direction into the injection nozzle is arranged between the piston cylinder (24) and the injection nozzle, and a second check valve for injecting the air in one direction into the piston cylinder (24) is arranged on the piston cylinder (24).