Electric injection molding machine

Abstract

The present invention provides an electric injection molding machine. The electric injection molding machine includes an injection molding main body, and the injection molding main body includes an injection molding mechanism and a driving mechanism fixed on the injection molding mechanism for driving the operation of the injection molding mechanism. The injection molding mechanism includes a mold part and an injection part installed on the mold part. The driving mechanism includes a first motor driving part connected to the mold part and a second motor driving part connected to the injection part. The first motor driving part is used for driving the injection part and the second motor driving part to move, and the second motor driving part is used for driving the injection part to inject raw materials into the mold part. Compared with the related art, the electric injection molding machine provided by the present invention has better reliability and is simpler and more convenient for subsequent maintenance and repair.

Description

Technical Field

[0001] The present invention relates to the technical field of zipper manufacturing equipment, and particularly to an electric injection molding machine.

Background Art

[0002] As a major zipper production country in the world, China accounts for 50% - 60% of the total global production. With the development of the zipper industry towards low cost, high quality, large scale, and intensification, the requirements for the production efficiency and automation equipment of zippers are also getting higher and higher. Zippers mainly include metal zippers, nylon zippers, and injection-molded zippers. Injection-molded zippers are widely welcomed due to their low cost and good performance.

[0003] In the related art, injection-molded zippers are usually completed by injection molding with an injection molding machine for zippers. The injection molding machine for zippers generally includes a driving part, a mold part, and a feeding part. The driving part controls the closing of the mold part, and the driving part controls the feeding part to inject raw materials into the closed mold, thereby completing the injection molding of zipper teeth or upper stops and lower stops.

[0004] However, in the related art, the driving part of the injection molding machine for zippers usually adopts a driving method using hydraulic oil to drive the closing of the mold part and the feeding of the feeding part, resulting in too high overall cost, poor reliability, and troublesome subsequent maintenance.

[0005] Therefore, it is necessary to provide a new electric injection molding machine to solve the above problems.

Summary of the Invention

[0006] Aiming at the technical problems of the injection molding machine for zippers in the related art, such as too high overall cost, poor reliability, and troublesome subsequent maintenance, the present invention provides an electric injection molding machine with better reliability and convenient maintenance.

[0007] An electric injection molding machine includes an injection molding main body, the injection molding main body includes an injection molding mechanism and a driving mechanism fixed on the injection molding mechanism for driving the operation of the injection molding mechanism. The injection molding mechanism includes a mold part and an injection part installed on the mold part. The driving mechanism includes a first motor driving part connected to the mold part and a second motor driving part connected to the injection part. The first motor driving part is used to drive the injection part and the second motor driving part to move, and the second motor driving part is used to drive the injection part to inject raw materials into the mold part.

[0008] Preferably, the mold part includes an upper mold part and a lower mold part connected to and oppositely arranged with the upper mold part. The injection part, the first motor driving part, and the second motor driving part are all installed on the upper mold part.

[0009] Preferably, the upper die part includes an upper die fixing plate close to one side of the lower die part, a die closing column connecting the upper die fixing plate and the lower die part, a feeding fixing plate located on the side of the upper die fixing plate far from the lower die part, a guide column connecting the upper die fixing plate and the feeding fixing plate, a positioning column and a first lead screw arranged on the side of the feeding fixing plate far from the upper die fixing plate, and the second motor driving part is installed on the nut of the first lead screw.

[0010] Preferably, the first motor driving part includes a driving cylinder installed on the feeding fixing plate and a first motor assembly installed on the positioning column. The driving cylinder is installed on the side of the feeding fixing plate close to the upper die fixing plate, and the output end of the driving cylinder is connected to the upper die fixing plate for driving the upper die fixing plate to move towards the lower die part.

[0011] Preferably, there are two driving cylinders, and the two driving cylinders are relatively spaced apart with respect to the central area of the feeding fixing plate.

[0012] Preferably, the first motor assembly includes a first fixing plate connected to the positioning column, a first driving motor installed on the first fixing plate, a first synchronous pulley installed on the output shaft of the first driving motor, a second synchronous pulley spaced from the first synchronous pulley, a first conveyor belt connecting the first synchronous pulley and the second synchronous pulley, a third synchronous pulley coaxially arranged with the second synchronous pulley, a fourth synchronous pulley spaced from the third synchronous pulley, and a second conveyor belt connecting the third synchronous pulley and the fourth synchronous pulley. There are two first lead screws, the fourth synchronous pulley is arranged on the screw of one first lead screw, and the third synchronous pulley and the second synchronous pulley are arranged on the screw of the other first lead screw.

[0013] Preferably, the second motor driving part includes a second fixing plate installed on the nut of the first lead screw, a second driving motor installed on the second fixing plate, a fifth synchronous pulley installed on the output shaft of the second driving motor, a sixth synchronous pulley spaced from the fifth synchronous pulley, a third conveyor belt connecting the fifth synchronous pulley and the sixth synchronous pulley, a rotating shaft inserted into the sixth synchronous pulley, and a coupling connecting the rotating shaft and the injection part.

[0014] Preferably, the upper die fixing plate and the feeding fixing plate are both provided with avoidance holes for avoiding the injection part. The injection part is arranged opposite to the avoidance holes of the upper die fixing plate and the feeding fixing plate. The injection part includes a barrel, a nozzle head arranged on the side of the barrel close to the lower die part, a hopper seat installed on the side of the barrel far from the lower die part, and a filling screw with one end connected to the coupling and the other end inserted into the barrel.

[0015] Preferably, the hopper seat includes a body portion installed on a side of the barrel away from the lower die portion and a feed portion communicating with the body portion. The feed portion is located on a side of the body portion, and a feed port is provided on the feed portion to communicate with the inside of the barrel.

[0016] Preferably, the electric injection molding machine further includes a frame, a tape feeding group, a tape dividing group, a positioning group, a tape pulling group, and a control panel. The injection molding main machine, the tape feeding group, the tape dividing group, the positioning group, the tape pulling group, and the control panel are all installed on the frame. The tape feeding group, the tape dividing group, and the positioning group are located on one side of the injection molding main machine, the tape pulling group is located on the other side of the injection molding main machine, and the control panel is electrically connected to the injection molding main machine.

[0017] Compared with the related art, the electric injection molding machine provided by the present invention replaces hydraulic drive with motor drive, making the driving process more accurate, convenient for speed regulation, better in reliability, and simpler and more convenient for subsequent maintenance.

Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings, where:

[0019] Figure 1 is a three-dimensional structural schematic diagram of the electric injection molding machine provided by the present invention;

[0020] Figure 2 is Figure 1 the exploded structural schematic diagram of the shown electric injection molding machine;

[0021] Figure 3 is Figure 2 the exploded structural schematic diagram of the shown injection molding main machine;

[0022] Figure 4 is Figure 3 the partial enlarged view of the shown Region IV.

Detailed Embodiments

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0024] Please refer toFigure 1 and Figure 2 The present invention provides an electric injection molding machine 100, which includes a frame 10, a tape feeding group 20, a tape separating group 30, a positioning group 40, an injection molding main machine 50, a tape pulling group 60 and a control panel 70 mounted on the frame 10. The tape feeding group 20, the tape separating group 30, and the positioning group 40 are arranged in sequence and located on one side of the injection molding main machine 50. The tape pulling group 60 is located on the other side of the injection molding main machine 50. The control panel 70 is electrically connected to the injection molding main machine 50 to control the operation of the mechanisms in the injection molding main machine 50. The tape feeding group 10 is used to input a zipper cloth tape into the injection molding main machine 50. The tape separating group 30 is used to separate the zipper cloth tape, so that the zipper cloth tape entering the injection molding main machine 50 is separated into two strips. The positioning group 40 is used for positioning the zipper cloth tape to ensure that the zipper cloth tape can normally enter the injection area of the injection molding main machine 50. The tape pulling group 60 is used to drive the zipper cloth tape to run, pull the zipper cloth tape that has been injection molded in the injection molding main machine 50 to move, and ensure that the next section of the zipper cloth tape can enter the injection molding main machine 50 for injection molding.

[0025] The frame 10 includes a bearing surface 11 and a recess 13 penetrating through the bearing surface 11. The injection molding main machine 50 is correspondingly arranged at the recess 13. The tape feeding group 20, the tape separating group 30, the positioning group 40, the tape pulling group 60 and the control panel 70 are all arranged on the bearing surface 11, and the tape feeding group 20, the tape separating group 30, the positioning group 40 and the tape pulling group 60 are spaced and oppositely arranged with respect to the recess 13. That is, the tape feeding group 20, the tape separating group 30, and the positioning group 40 are arranged on one side of the bearing surface 11, and the tape pulling group 60 is arranged on the other side of the bearing surface 11.

[0026] The tape feeding group 20, the tape separating group 30 and the positioning group 40 are all located on the incoming side of the zipper cloth tape of the injection molding main machine 50. Specifically, the tape feeding group 20 includes a guiding rod 21 and a plurality of guiding rollers 23 arranged on the guiding rod 21. The tape feeding group 20, the tape separating group 30 and the positioning group 40 cooperate together to enable the zipper cloth tape to smoothly enter the injection area of the injection molding main machine 50.

[0027] Please refer to Figures 2 to 4 The injection molding main machine 50 includes an injection molding mechanism 51 and a driving mechanism 52 fixed on the injection molding mechanism 51 to drive the operation of the injection molding mechanism 51. The injection molding mechanism 51 includes a mold part 53 and an injection part 54 mounted on the mold part 53. The driving mechanism 52 includes a first motor driving part 55 and a third motor driving part 56 connected to the mold part 53 and a second motor driving part 57 connected to the injection part 54.

[0028] The mold part 53 includes an upper mold part 531 and a lower mold part 533 which is connected to and oppositely arranged with the upper mold part 531. The lower mold part 533 is correspondingly located in the recessed part 13. The injection part 54, the first motor driving part 55 and the second motor driving part 57 are all installed on the upper mold part 531, and the third motor driving part 56 is installed on the lower mold part 533.

[0029] The upper mold part 531 includes an upper mold fixing plate 5311 on the side close to the lower mold part 533, a mold clamping column 5312 connecting the upper mold fixing plate 5311 and the lower mold part 533, a feeding fixing plate 5313 on the side of the upper mold fixing plate 5311 away from the lower mold part 533, a guide post 5314 connecting the upper mold fixing plate 5311 and the feeding fixing plate 5313, a positioning post 5315 arranged on the side of the feeding fixing plate 5313 away from the upper mold fixing plate 5311, and a first lead screw 5316.

[0030] Avoidance holes are respectively formed at the centers of the upper mold fixing plate 5311 and the feeding fixing plate 5313. The injection part 54 is arranged opposite to the avoidance holes of the upper mold fixing plate 5311 and the feeding fixing plate 5313. There are four mold clamping columns 5312, guide posts 5314 and positioning posts 5315 respectively, and they are respectively located in the end face edge areas of the upper mold fixing plate 5311 and the feeding fixing plate 5313. There are two first lead screws 5316, and the two first lead screws 5316 are relatively spaced apart with respect to the central area of the end face of the feeding fixing plate 5313. The first motor driving part 55 is installed on the positioning post 5315, and the output end of the first motor driving part 55 is connected to the screw 5317 of the first lead screw 5316. The second motor driving part 57 is installed on the nut 5318 of the first lead screw 5316.

[0031] The lower die part 533 includes a lower die fixing plate 5331 disposed opposite to the upper die fixing plate 5311 and a second lead screw assembly 5333 provided on a side of the lower die fixing plate 5331 away from the upper die fixing plate 5311. The lower die fixing plate 5331 is provided with an avoidance hole for avoiding the die closing column 5312, and the die closing column 5312 passes through the lower die fixing plate 5331. A clearance space is formed between the upper die fixing plate 5311 and the lower die fixing plate 5331 at intervals, and an injection mold (not shown in the figure) is installed in the clearance space. The injection mold includes an upper die and a lower die. The upper die is installed on the upper die fixing plate 5311, and the lower die is installed on the lower die fixing plate 5331. The upper die fixing plate 5311 can move towards the lower die fixing plate 5331 to realize die closing between the upper die and the lower die. The zipper cloth tape to be injected is located between the upper die and the lower die. When die closing, the upper die and the lower die enclose to form a cavity, and the zipper cloth tape is connected to the cavity. Raw materials are injected into the cavity through the injection port of the upper die to complete injection molding.

[0032] The second lead screw assembly 5333 includes a second lead screw 5334, a bushing assembly 5335 installed at one end of the second lead screw 5334, a lead screw support seat 5336, and a die closing column fixing plate 5337 fixedly connected to the nut of the second lead screw 5334. The nut of the second lead screw 5334 is located at the other end away from the bushing assembly 5335, and the die closing column 5312 is fixedly installed on the die closing column fixing plate 5337.

[0033] The injection part 54 includes a barrel 541, a nozzle 542 provided on a side of the barrel 541 close to the lower die part 533, a hopper seat 543 installed on a side of the barrel 541 away from the lower die part 533, and a feeding screw 544 with one end fixedly connected to the second motor driving part 57 and the other end inserted into the barrel 541. The hopper seat 543 includes a main body part 5431 installed on a side of the barrel 541 away from the lower die part 533 and a feeding part 5433 communicating with the main body part 5431. The feeding part 5433 is located on a side of the main body part 5431, and a feeding port 5434 is provided on the feeding part 5433 to communicate with the inside of the barrel 541. Specifically, a fixing part is provided on the barrel 541, and a threaded hole is provided on the fixing part. The feeding fixing plate 5313 is provided with a mounting hole corresponding to the threaded hole of the fixing part, and a thread matching the threaded hole is provided in the mounting hole. The barrel 541 is fixed to the feeding fixing plate 5313 by screws passing through the threaded hole and the mounting hole.

[0034] The first motor driving part 55 includes a driving cylinder 551 installed on the feeding fixing plate 5313 and a first motor assembly 553 installed on the positioning column 5315. The driving cylinder 551 is installed on the side of the feeding fixing plate 5313 close to the upper die fixing plate 5311, and the driving cylinder 551 is connected to the upper die fixing plate 5311. There are two driving cylinders 551, and the two driving cylinders 551 are relatively spaced apart with respect to the central area of the feeding fixing plate 5313.

[0035] The working principle of the driving cylinder 551: The driving cylinder 551 expands and contracts to drive the feeding fixing plate 5313 to move closer to or away from the upper die fixing plate 5311, and further makes the barrel 541 fixed on the feeding fixing plate 5313 move closer to or away from the upper die fixing plate 5311, so that the material head 542 is closer to or farther from the injection hole of the upper die.

[0036] The first motor assembly 553 includes a first fixing plate 5531 fixedly connected to the positioning column 5315, a first driving motor 5532 installed on the first fixing plate 5531, a first synchronous pulley 5533 installed on the output shaft of the first driving motor 5532, a second synchronous pulley 5534 spaced from the first synchronous pulley 5533, a first conveyor belt 5535 connecting the first synchronous pulley 5533 and the second synchronous pulley 5534, a third synchronous pulley 5536 coaxially arranged with the second synchronous pulley 5534, a fourth synchronous pulley 5537 spaced from the third synchronous pulley 5536, and a second conveyor belt 5538 connecting the third synchronous pulley 5536 and the fourth synchronous pulley 5537. There are two first lead screws 5316, the fourth synchronous pulley 5537 is arranged on the screw rod 5317 of one first lead screw 5316, and the third synchronous pulley 5536 and the second synchronous pulley 5534 are arranged on the screw rod 5317 of the other first lead screw 5316. Specifically, a key groove is provided on the screw rod 5317 of each first lead screw 5316, a transmission key is arranged in the key groove, and the transmission key and the screw rod 5317 of the first lead screw 5316 are inserted into the fourth synchronous pulley 5537 and the third synchronous pulley 5536 and the second synchronous pulley 5534 for transmission.

[0037] The first fixing plate 5531 includes a first positioning plate 55311 connected and fixed to the positioning column 5315 and a first motor mounting plate 55313 mounted and fixed to the first positioning plate 55311. The first driving motor 5532 is installed on the first motor mounting plate 55313.

[0038] Working principle of the first motor assembly 553: The first driving motor 5532 drives the first synchronous pulley 5533 to rotate. The first synchronous pulley 5533 drives the second synchronous pulley 5534 to rotate through the first conveyor belt 5535, so that the second synchronous pulley 5534 drives the screw rod 5317 of one of the first lead screws 5316 to rotate. At the same time, another third synchronous pulley 5536 on the screw rod 5317 of the same first lead screw 5316 rotates driven by the screw rod 5317. The third synchronous pulley 5536 drives the fourth synchronous pulley 5537 to rotate through the second conveyor belt 5538, so that the fourth synchronous pulley 5537 drives the screw rod 5317 of the other first lead screw 5316 to rotate, causing the nuts 5318 on the two first lead screws 5316 to move on the screw rod 5317 under the rotation of the screw rod 5317, realizing driving the second motor driving part 57 fixed on the nut 5318 to move.

[0039] The second motor driving part 57 includes a second fixing plate 571 installed on the nut 5318 of the first lead screw 5316, a second driving motor 572 installed on the second fixing plate 571, a fifth synchronous pulley 573 installed on the output shaft of the second driving motor 572, a sixth synchronous pulley 574 arranged at an interval opposite to the fifth synchronous pulley 573, a third conveyor belt 575 connecting the fifth synchronous pulley 573 and the sixth synchronous pulley 574, a rotating shaft 576 inserted into the sixth synchronous pulley 574, and a coupling 577 connecting the rotating shaft 576 and the feeding screw 544.

[0040] The second fixing plate 571 includes a second positioning plate 5711 fixedly connected to the nut of the first lead screw 5316 and a second motor mounting plate 5713 fixedly installed on the second positioning plate 5711. The second driving motor 572 is installed on the second motor mounting plate 5713.

[0041] Working principle of the second motor driving part 57: The second driving motor 572 drives the fifth synchronous pulley 573 to rotate. The fifth synchronous pulley 573 drives the sixth synchronous pulley 574 to rotate through the third conveyor belt 575, thereby driving the rotating shaft 576 inserted into the sixth synchronous pulley 574 to rotate. The rotating shaft 576 drives the feeding screw 544 to rotate through the coupling 577.

[0042] Specifically, the injection principle of the injection part 54 can be as follows: on the side of the barrel 541 away from the lower die part 533, a channel with a larger aperture is formed. The diameter of the injection screw 544 is smaller than the diameter of the channel, so that a gap is formed between the main material screw 544 and the inner wall of the channel. The raw materials injected from the hopper seat 543 can smoothly flow downward from the gap. While on the side of the barrel 541 close to the lower die part 544, a channel with a smaller aperture is formed. Threads matching the injection screw 544 are provided on the inner wall of the channel with a smaller aperture. After the raw materials flow into the channel with a smaller aperture, the first motor assembly 553 drives the second motor driving part 57 to move in a direction close to the lower die part 533. The injection screw 544 fixed on the second motor driving part 57 moves in the direction of the inner wall of the channel with a smaller aperture close to the lower die part 533 under the drive of the second motor driving part 57. Finally, the injection screw 544 extrudes the raw materials downward through the threads on the inner wall of the channel with a smaller aperture under the drive of the second motor driving part 57, so that the raw materials flow into the mold from the nozzle 542.

[0043] The third motor driving part 56 includes a third driving motor 561, a seventh synchronous pulley 562 installed on the output shaft of the third driving motor 561, an eighth synchronous pulley 563 arranged at a relatively spaced interval from the seventh synchronous pulley 562, and a fourth conveyor belt 564 connecting the seventh synchronous pulley 562 and the eighth synchronous pulley 563. The third driving motor 561 can be fixed on the frame 10. The seventh synchronous pulley 562, the eighth synchronous pulley 563 and the fourth conveyor belt 564 are located on the side of the screw rod support seat 5336 away from the upper die part 531, and the eighth synchronous pulley 563 is connected to the sleeve assembly 5335 through a transmission key. The third driving motor 561 drives the seventh synchronous pulley 562 to drive the eighth synchronous pulley 563 to rotate, so that the eighth synchronous pulley 563 drives the second screw rod assembly 5333 to operate through the transmission key.

[0044] The working principle of the third motor driving part 56: The third driving motor 561 drives the sleeve assembly 5335 to rotate through the seventh synchronous pulley 562, the fourth conveyor belt 564 and the eighth synchronous pulley 563, so as to drive the second screw rod 5334 to rotate, and the mold clamping column fixing plate 5337 fixed on the nut of the second screw rod 5334 drives the upper die part 531 to move in a direction close to or away from the lower die part 533 through the mold clamping column 5312, so as to realize mold clamping and mold opening.

[0045] That is, in this embodiment, the first motor driving part 55 is used to drive the injection part 54 and the second motor driving part 57 towards the lower die part 533. Among them, the driving cylinder 551 is used to drive the movement of the barrel 541, and the first motor assembly 553 is used to drive the movement of the second motor driving part 57 and the injection screw 544. The second motor driving part 57 is used to drive the rotation of the injection screw 544, so that the injection screw 544 extrudes the raw material in the barrel 541. The third motor driving part 56 is used to drive the clamping and unclamping of the upper die part 531 and the lower die part 533.

[0046] Compared with the related art, the electric injection molding machine provided by the present invention replaces hydraulic drive with motor drive, making the driving process more accurate, convenient for speed regulation, better in reliability, and simpler and more convenient for subsequent maintenance.

[0047] The above are only the embodiments of the present invention. It should be noted here that for those of ordinary skill in the art, improvements can be made without departing from the inventive concept of the present invention, but these all belong to the protection scope of the present invention.

Claims

1. An electric injection molding machine, which is used to complete the injection molding of zipper teeth or upper stops and lower stops; including an injection molding main machine, characterized in that, The injection molding main machine includes an injection molding mechanism and a driving mechanism fixed on the injection molding mechanism for driving the operation of the injection molding mechanism. The injection molding mechanism includes a mold part and an injection part installed on the mold part. The driving mechanism includes a first motor driving part, a third motor driving part connected to the mold part, and a second motor driving part connected to the injection part. The first motor driving part is used to drive the injection part and the second motor driving part to move. The second motor driving part is used to drive the injection part to inject raw materials into the mold part; The electric injection molding machine further includes a frame, a tape feeding group, a tape dividing group, a positioning group, a tape pulling group and a control panel. The injection molding main machine, the tape feeding group, the tape dividing group, the positioning group, the tape pulling group and the control panel are all installed on the frame. The tape feeding group, the tape dividing group and the positioning group are located on one side of the injection molding main machine, and the tape pulling group is located on the other side of the injection molding main machine. The control panel is electrically connected to the injection molding main machine; The mold part includes an upper mold part and a lower mold part connected to and oppositely arranged with the upper mold part. The injection part, the first motor driving part and the second motor driving part are all installed on the upper mold part. The third motor driving part is used to drive the mold closing and mold opening between the upper mold part and the lower mold part.

2. The electric injection molding machine according to claim 1, characterized in that, The upper mold part includes an upper mold fixing plate on one side close to the lower mold part, a mold closing column connecting the upper mold fixing plate and the lower mold part, a feeding fixing plate on the side of the upper mold fixing plate far from the lower mold part, a guide column connecting the upper mold fixing plate and the feeding fixing plate, a positioning column arranged on the side of the feeding fixing plate far from the upper mold fixing plate, and a first lead screw. The second motor driving part is installed on the nut of the first lead screw.

3. The electric injection molding machine according to claim 2, characterized in that, The first motor driving part includes a driving cylinder installed on the feeding fixing plate and a first motor assembly installed on the positioning column. The driving cylinder is installed on the side of the feeding fixing plate close to the upper mold fixing plate, and the output end of the driving cylinder is connected to the upper mold fixing plate to drive the feeding fixing plate to move towards or away from the upper mold fixing plate.

4. The electric injection molding machine according to claim 3, characterized in that, There are two driving cylinders, and the two driving cylinders are relatively spaced apart with respect to the central area of the feeding fixing plate.

5. The electric injection molding machine according to claim 3, characterized in that, The first motor assembly includes a first fixing plate connected to the positioning column, a first driving motor installed on the first fixing plate, a first synchronous pulley installed on the output shaft of the first driving motor, a second synchronous pulley spaced apart from the first synchronous pulley, a first conveyor belt connecting the first synchronous pulley and the second synchronous pulley, a third synchronous pulley coaxially arranged with the second synchronous pulley, a fourth synchronous pulley spaced apart from the third synchronous pulley, and a second conveyor belt connecting the third synchronous pulley and the fourth synchronous pulley. There are two first lead screws, and the fourth synchronous pulley is arranged on the screw rod of one first lead screw, and the third synchronous pulley and the second synchronous pulley are arranged on the screw rod of the other first lead screw.

6. The electric injection molding machine according to claim 2, characterized in that, The second motor driving part includes a second fixing plate mounted on a nut of the first lead screw, a second driving motor mounted on the second fixing plate, a fifth synchronous pulley mounted on an output shaft of the second driving motor, a sixth synchronous pulley spaced from the fifth synchronous pulley, a third conveyor belt connecting the fifth synchronous pulley and the sixth synchronous pulley, a rotating shaft inserted into the sixth synchronous pulley, and a coupling connecting the rotating shaft and the injection part.

7. The electric injection molding machine according to claim 6, wherein The upper die fixing plate and the feeding fixing plate are both provided with avoidance holes for avoiding the injection part. The injection part is arranged opposite to the avoidance holes of the upper die fixing plate and the feeding fixing plate. The injection part includes a barrel, a nozzle arranged on one side of the barrel close to the lower die part, a hopper seat mounted on the other side of the barrel far from the lower die part, and a filling screw with one end connected to the coupling and the other end inserted into the barrel.

8. The electric injection molding machine according to claim 7, wherein, The hopper seat includes a body part mounted on the other side of the barrel far from the lower die part and a feeding part communicated with the body part. The feeding part is located on the side of the body part and a feeding port is arranged on the feeding part to communicate with the inside of the barrel.

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