Electric appliance precision plastic part injection mold

Abstract

The application discloses an electric appliance precision plastic part injection mold in the technical field of injection molds, which comprises an inner mold, a front mold plate, an upper mold plate, a lower mold plate, a left mold plate, a right mold plate, and a fixed plate which is sleeved on the inner mold and is in sliding connection with the inner mold; a demolding mechanism is arranged on the frame-shaped mold, and the demolding mechanism is used for driving the upper mold plate, the lower mold plate, the left mold plate and the right mold plate to be separated from the shell first when demolding; a cutting mechanism is arranged on the frame-shaped mold, and the cutting mechanism is used for automatically cutting off the excess part of the shell at the injection pipe connecting position after the frame-shaped mold is separated from the shell; a first driving mechanism is arranged at a front position of the frame-shaped mold, and the first driving mechanism is used for driving the demolding mechanism and the cutting mechanism to operate; after the frame-shaped mold is separated from the shell, the shell can be separated from the inner mold by driving the inner mold to move backward relative to the fixed plate, so that the demolding of the shell can be conveniently completed.

Description

Technical Field

[0001] This invention relates to the field of injection mold technology, specifically to an injection mold for precision plastic parts for electrical appliances. Background Technology

[0002] Most existing precision electrical components require plastic casings for packaging, which effectively protects these components. These plastic casings are typically produced using injection molding, which usually involves two molds, inner and outer, inserted together. The molded casing sits between these two molds, making demolding more difficult due to the larger contact area between the outer mold and the casing. Furthermore, after molding, excess waste material remains on the casing surface near the injection port, which can affect the quality of the molded product. Summary of the Invention

[0003] The purpose of this invention is to provide an injection mold for precision plastic parts for electrical appliances, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an injection mold for precision plastic parts for electrical appliances, comprising an inner mold, a front template, an upper template, a lower template, a left template, and a right template. A fixing plate is fitted onto the inner mold, and the inner mold is slidably connected to the fixing plate. The front template, upper template, lower template, left template, and right template of the inner mold are combined to form a frame-shaped mold. The frame-shaped mold is fitted onto the inner mold, and the rear portion of the combined frame-shaped mold is fitted to the fixing plate. Multiple injection tubes are fixedly connected to the front position of the front template.

[0005] The frame mold is equipped with a demolding mechanism, which is used to drive the upper template, lower template, left template and right template to separate from the shell first during demolding;

[0006] The frame mold is equipped with a cutting mechanism, which is used to automatically cut off the excess part of the shell located at the injection tube connection after the frame mold is separated from the shell.

[0007] A first driving mechanism is provided at the front of the frame mold, which is used to drive the demolding mechanism and the cutting mechanism.

[0008] Preferably, the demolding mechanism includes two first connecting frames and two second connecting frames. The two first connecting frames are symmetrically distributed on the upper and lower sides of the front template and are fixedly connected to the front template. The two second connecting frames are symmetrically distributed on the left and right sides of the front template and are fixedly connected to the front template. A rotating frame is rotatably connected to the first connecting frame, and the upper and lower rotating frames are fixedly connected to the upper template and the lower template, respectively. A sliding block is slidably connected to the second connecting frame, and a first spring is sleeved on the second connecting frame. One end of the first spring is fixedly connected to the sliding block, and the other end is fixedly connected to the second connecting frame. The sliding blocks on the left and right sides are fixedly connected to the left template and the right template, respectively. A rotating mechanism is provided on the first connecting frame, which drives the rotating frame to rotate relative to the first connecting frame. A locking mechanism is provided on the rotating frame, which locks the left template and the right template when the upper template and the lower template are in a closed state.

[0009] Preferably, the rotating mechanism includes a first worm gear, which is rotatably connected to a first connecting frame and has a first worm wheel meshing on it. The first worm wheel is fixedly connected to the first connecting frame. A drive rod is fixedly connected to the front end of the first worm gear.

[0010] Preferably, the locking mechanism includes two extension rods, which are symmetrically distributed on the left and right sides of the first connecting frame and both extension rods are fixedly connected to the first connecting frame; an arc-shaped rod is fixedly connected to the extension rod, and the portion of the arc-shaped rod away from the extension rod is outwardly protruding; a first top rod is provided on the outer side of the arc-shaped rod, and the first top rod is in contact with the arc-shaped rod; the first top rods on the left and right sides are fixedly connected to the left template and the right template, respectively; a second top rod is fixedly connected to the arc-shaped rod, and the second top rods on the left and right sides are in contact with the left template and the right template, respectively.

[0011] Preferably, the cutting mechanism includes a first connecting plate, which is located in front of the front template and has rotating cylinders symmetrically connected to its upper and lower sides. The rotating cylinders penetrate the front template and are in clearance fit with it. The rear end surface of the rotating cylinder is flush with the rear surface of the front template, and a second spring is sleeved on the rotating cylinder. One end of the second spring is fixedly connected to the first connecting plate, and the other end is fixedly connected to the front template. A cutting blade is provided inside the rotating cylinder, and an extension mechanism is provided on the cutting blade for extending the cutting blade to cut the waste material. A second driving mechanism is provided on the first connecting plate for driving the extension mechanism. A rotating mechanism is provided on the first connecting plate for driving the two rotating cylinders to rotate.

[0012] Preferably, the extension mechanism includes a rotating rod located inside and rotatably connected to the rotating cylinder; a fixed frame is fixedly connected to the rotating rod, and the cutting blade is located inside and rotatably connected to the fixed frame; a second worm gear is rotatably connected to the rotating rod, a second worm wheel meshes with the second worm gear, a first bevel gear is coaxially fixedly connected to the second worm wheel, and both the first bevel gear and the second worm wheel are rotatably connected to the rotating rod; a second bevel gear meshes with the first bevel gear, the second bevel gear is rotatably connected to the fixed frame and fixedly connected to the cutting blade; gears are fixedly connected to both ends of the second worm gear, and arc-shaped racks are fixedly connected to the inner wall of the rotating cylinder near the gears on both sides, the arc-shaped racks meshing with the gears.

[0013] Preferably, the second driving mechanism includes a second connecting plate, which is located in front of the first connecting plate and has two first cylinders fixedly connected to it. The telescopic ends of the first cylinders are fixedly connected to the first connecting plate. First sliding rods are fitted at both ends of the second connecting plate, with a clearance fit between the first sliding rods and the second connecting plate. The two first sliding rods are respectively fixedly connected to two rotating cylinders. A connecting ring is fitted on each of the first sliding rods, with a clearance fit between the connecting rings and the first sliding rods, and the connecting rings are rotatably connected to the second connecting plate. A second sliding rod is fixedly connected to the connecting ring, and the second sliding rod is slidably connected to the rotating cylinder and passes through the rotating cylinder. A connecting rod is rotatably connected to one end of the second sliding rod located inside the rotating cylinder, and the rear end of the connecting rod is rotatably connected to a rotating rod. A torsion spring is provided at the connection point between the rotating rod and the rotating cylinder.

[0014] Preferably, the rotating mechanism includes a fixed frame, which is fixedly connected to the first connecting plate and a motor is fixedly connected inside the fixed frame. A first pulley is fixedly connected to the rear end of the motor output shaft, and a belt is provided on the first pulley. A second pulley is fixedly connected to the front end of the first slide rod, and the belt meshes with both the first pulley and the two second pulleys simultaneously.

[0015] Preferably, the first driving mechanism includes a second cylinder and four third cylinders. The extension end of the second cylinder is fixedly connected to a push frame. The push frame has threaded rods symmetrically arranged on its upper and lower sides. The threaded rods are threadedly engaged with the push frame and do not have self-locking properties. Two of the threaded rods are fixedly connected to two driving rods respectively. The upper and lower sides of the push frame are located directly in front of the upper and lower sides of the first connecting plate. All four third cylinders are fixedly connected to the push frame, and the rear end of the third cylinder is fixedly connected to the front template.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] This invention activates a first driving mechanism, which first drives a demolding mechanism to operate. The demolding mechanism simultaneously drives the upper mold plate, lower mold plate, left mold plate, and right mold plate to detach from the molded shell. Then, the first driving mechanism drives a cutting mechanism to operate. The cutting mechanism first drives the front mold plate to detach from the shell. Since there will be excess waste material at the injection position of the injection tube after the shell detaches from the front mold plate, the cutting mechanism can automatically cut off the excess waste material, thereby ensuring the quality of the injection molded product. After the frame mold detaches from the shell, the shell can be separated from the inner mold by driving the inner mold to move backward relative to the fixed plate, thus completing the demolding of the shell relatively conveniently.

[0018] This invention drives two first cylinders to move the second connecting plate backward, which in turn moves the second sliding rod backward. Under the action of the torsion spring, the rotating rod inside the rotating drum will start to rotate automatically and eventually rotate to a state perpendicular to the rotating drum. At this point, stopping the two second cylinders can lock the rotating rod in a state perpendicular to the rotating drum. Then, the motor is started to drive the two rotating drums to rotate. When the rotating drums rotate, they can detach from the shell and simultaneously drive the cutting blade to cut off the excess part on the shell, which can effectively improve the overall quality of the shell. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the rear view structure of the present invention;

[0021] Figure 3 This is a schematic diagram of the disassembled structure of the present invention;

[0022] Figure 4 This is a schematic diagram of the cutting mechanism in this invention;

[0023] Figure 5 This is a schematic diagram of the disassembled structure of the cutting mechanism in this invention;

[0024] Figure 6 This is a schematic diagram of the structure of the second driving mechanism in this invention;

[0025] Figure 7 This is a cross-sectional view of the rotating cylinder in this invention;

[0026] Figure 8 for Figure 7 A magnified structural diagram of A in the middle;

[0027] Figure 9 This is a schematic diagram of the extension mechanism in this invention.

[0028] The attached diagram lists the components represented by each number as follows:

[0029] 1. Inner mold; 2. Front mold plate; 3. Upper mold plate; 4. Lower mold plate; 5. Left mold plate; 6. Right mold plate; 7. Fixing plate; 8. Injection tube; 9. First connecting frame; 10. Second connecting frame; 11. Rotating frame; 12. Sliding block; 13. First spring; 14. First worm gear; 15. First worm wheel; 16. Drive rod; 17. Extension rod; 18. Arc rod; 19. First ejector rod; 20. Second ejector rod; 21. First connecting plate; 22. Rotary drum; 23. Cutting blade; 24. Rotating rod; 25. 26. Fixed frame; 27. Second worm gear; 28. First bevel gear; 29. ​​Second bevel gear; 30. Arc rack; 31. Second connecting plate; 32. First cylinder; 33. First slide rod; 34. Connecting ring; 35. Second slide rod; 36. Connecting rod; 37. Fixed frame; 38. Motor; 39. First pulley; 40. Belt; 41. Second pulley; 42. Second cylinder; 43. Push frame; 44. Threaded rod; 45. Third cylinder; 46. Second spring; 47. Gear. Detailed Implementation

[0030] Please see Figure 1-9 This invention provides a technical solution: an injection mold for precision plastic parts of electrical appliances, comprising an inner mold 1, a front template 2, an upper template 3, a lower template 4, a left template 5, and a right template 6. A fixing plate 7 is fitted onto the inner mold 1, and the inner mold 1 is slidably connected to the fixing plate 7. The front template 2, upper template 3, lower template 4, left template 5, and right template 6 of the inner mold 1 are combined to form a frame mold, which is fitted onto the inner mold 1, and the rear part of the combined frame mold is in contact with the fixing plate 7. A plurality of injection tubes 8 are fixedly connected to the front position of the front template 2.

[0031] The frame mold is equipped with a demolding mechanism, which is used to drive the upper template 3, lower template 4, left template 5 and right template 6 to separate from the shell first during demolding;

[0032] The frame mold is equipped with a cutting mechanism, which is used to first drive the front template 2 and the shell to separate, and after the front template 2 and the shell are separated, automatically cut off the excess part of the shell located at the connection of the injection tube 8.

[0033] A first driving mechanism is provided at the front of the frame mold, which is used to drive the demolding mechanism and the cutting mechanism to operate.

[0034] During operation, the frame mold is attached to the inner mold 1 and the frame mold is attached to the fixing plate 7. At this time, the injection molding equipment is started to inject the injection material through multiple injection tubes 8 into the space between the frame mold and the inner mold 1, filling the gap between the frame mold and the inner mold 1. After the injection-molded shell has cooled down, the first drive mechanism is started. The first drive mechanism first drives the demolding mechanism to run. Through the demolding mechanism, the upper mold plate 3, lower mold plate 4, left mold plate 5, and right mold plate 6 can be driven to separate from the molded shell. Then, the first drive mechanism drives the cutting mechanism to run. The cutting mechanism first drives the front mold plate 2 to separate from the shell. Since there will be excess waste material at the injection position of the injection tube 8 after the shell separates from the front mold plate 2, the cutting mechanism can automatically cut off the excess waste material, thereby ensuring the quality of the injection-molded product. After the frame mold separates from the shell, the shell can be separated from the inner mold 1 by driving the inner mold 1 to move backward relative to the fixing plate 7.

[0035] like Figure 1-4 As shown, as a further embodiment of the present invention, the demolding mechanism includes two first connecting frames 9 and two second connecting frames 10. The two first connecting frames 9 are symmetrically distributed on the upper and lower sides of the front template 2, and both first connecting frames 9 are fixedly connected to the front template 2. The two second connecting frames 10 are symmetrically distributed on the left and right sides of the front template 2, and both second connecting frames 10 are fixedly connected to the front template 2. A rotating frame 11 is rotatably connected to the first connecting frame 9, and the upper and lower rotating frames 11 are fixedly connected to the upper template 3 and the lower template 4, respectively. The second connecting frames 10 are rotatably connected to the first connecting frame 9. A sliding block 12 is slidably connected to the upper template 3 and the lower template 4, and a first spring 13 is sleeved on the second connecting frame 10. One end of the first spring 13 is fixedly connected to the sliding block 12 and the other end is fixedly connected to the second connecting frame 10. The left and right sliding blocks 12 are fixedly connected to the left template 5 and the right template 6, respectively. A rotating mechanism is provided on the first connecting frame 9, which is used to drive the rotating frame 11 to rotate relative to the first connecting frame 9. A locking mechanism is provided on the rotating frame 11, which is used to lock the left template 5 and the right template 6 when the upper template 3 and the lower template 4 are in the closed state.

[0036] The rotating mechanism includes a first worm 14, which is rotatably connected to a first connecting frame 9 and a first worm wheel 15 meshes on the first worm 14. The first worm wheel 15 is fixedly connected to the first connecting frame 9. A drive rod 16 is fixedly connected to the front end of the first worm 14.

[0037] The locking mechanism includes two extension rods 17, which are symmetrically distributed on the left and right sides of the first connecting frame 9 and are fixedly connected to the first connecting frame 9. An arc-shaped rod 18 is fixedly connected to the extension rod 17. The part of the arc-shaped rod 18 away from the extension rod 17 is protruding outward. A first top rod 19 is provided on the outer side of the arc-shaped rod 18. The first top rod 19 fits against the arc-shaped rod 18. The first top rods 19 on the left and right sides are fixedly connected to the left template 5 and the right template 6, respectively. A second top rod 20 is fixedly connected to the arc-shaped rod 18. The second top rods 20 on the left and right sides fit against the left template 5 and the right template 6, respectively.

[0038] During operation, when the drive rods 16 on the upper and lower sides are rotated, the drive rods 16 will drive the first worm gear 14 to rotate. When the first worm gear 14 rotates, it will drive the rotating frames 11 on the upper and lower sides to rotate. The rotating frames 11 on the upper and lower sides will then drive the upper template 3 to rotate upward and the lower template 4 to rotate downward, respectively. At this time, the upper template 3 and the lower template 4 begin to detach from the shell. When the rotating frames 11 on the upper and lower sides rotate, the rotating frames 11 will drive the arc-shaped rod 18 and the second top rod 20 to move through the extension rod 17. The second top rods 20 on the left and right sides will slowly detach from the left template 5 and the right template 6. When the left and right sides After the second push rod 20 disengages from the left template 5 and the right template 6, the protruding part of the arc rod 18 begins to contact the first push rod 19. As the arc rod 18 continues to move, it will begin to press the first push rod 19 outward. The first push rods 19 on the left and right sides will then drive the left template 5 to move to the left and the right template 6 to move to the right, respectively. The left template 5 and the right template 6 will then automatically disengage from the shell. When the upper template 3, lower template 4, left template 5 and right template 6 have all disengaged from the shell, the shell will be able to fit onto the inner mold 1, thus facilitating the cleaning of excess waste material on the shell.

[0039] like Figure 5-9 As shown, as a further embodiment of the present invention, the cutting mechanism includes a first connecting plate 21, which is located in front of the front template 2 and symmetrically connected to rotating cylinders 22 on its upper and lower sides. The rotating cylinders 22 penetrate the front template 2 and are in clearance fit with the front template 2. The rear end surface of the rotating cylinder 22 is flush with the rear surface of the front template 2, and a second spring 46 is sleeved on the rotating cylinder 22. One end of the second spring 46 is fixedly connected to the first connecting plate 21, and the other end is fixedly connected to the front template 2. A cutting blade 23 is provided inside the rotating cylinder 22, and an extension mechanism is provided on the cutting blade 23 for extending the cutting blade 23 to cut the shell waste. A second driving mechanism is provided on the first connecting plate 21 for driving the extension mechanism to operate. A rotating mechanism is provided on the first connecting plate 21 for driving the two rotating cylinders 22 to rotate.

[0040] The extension mechanism includes a rotating rod 24, which is located inside and rotatably connected to the rotating cylinder 22; a fixed frame 25 is fixedly connected to the rotating rod 24, and the cutting blade 23 is located inside and rotatably connected to the fixed frame 25; a second worm gear 26 is rotatably connected to the rotating rod 24, a second worm wheel 27 meshes with the second worm gear 26, and a first bevel gear 28 is coaxially fixedly connected to the second worm wheel 27; both the first bevel gear 28 and the second worm wheel 27 are rotatably connected to the rotating rod 24; a second bevel gear 29 meshes with the first bevel gear 28, and the second bevel gear 29 is rotatably connected to the fixed frame 25 and fixedly connected to the cutting blade 23; gears 47 are fixedly connected to both ends of the second worm gear 26, and arc-shaped racks 30 are fixedly connected to the inner wall of the rotating cylinder 22 near the gears 47 on both sides, with the arc-shaped racks 30 meshing with the gears 47;

[0041] The second drive mechanism includes a second connecting plate 31, which is located in front of the first connecting plate 21 and has two first cylinders 32 fixedly connected to it. The telescopic ends of the first cylinders 32 are fixedly connected to the first connecting plate 21. First slide rods 33 are fitted onto both ends of the second connecting plate 31, with a clearance fit between the first slide rods 33 and the second connecting plate 31. The two first slide rods 33 are respectively fixedly connected to two rotating cylinders 22. A connecting ring 34 is fitted onto the first slide rod 33, with a clearance fit between the connecting ring 34 and the first slide rod 33. The connecting ring 34 is rotatably connected to the second connecting plate 31. A second slide rod 35 is fixedly connected to the connecting ring 34, and the second slide rod 35 is slidably connected to the rotating cylinder 22 and passes through the rotating cylinder 22. A connecting rod 36 is rotatably connected to one end of the second slide rod 35 inside the rotating cylinder 22, and the rear end of the connecting rod 36 is rotatably connected to a rotating rod 24. A torsion spring is provided at the connection point between the rotating rod 24 and the rotating cylinder 22.

[0042] During operation, after the upper template 3, lower template 4, left template 5, and right template 6 are all detached from the housing, the front template 2 is driven to move forward relative to the first connecting plate 21, and the rotating cylinder 22 abuts against the housing, causing the front template 2 to detach from the housing. When the front template 2 moves to the position closest to the first connecting plate 21, the two first cylinders 32 are driven, which in turn drive the second connecting plate 31 to move closer to the first connecting plate 21. The second connecting plate 31 drives the two second sliding rods 35 to move backward through the two connecting rings 34. When the second sliding rods 35 move backward, the rotating rod 24 inside the rotating cylinder 22 will start to rotate automatically under the action of the torsion spring and eventually rotate to a state perpendicular to the rotating cylinder 22. At this time, stopping the two second cylinders 42 can lock the rotating rod 24 in a state perpendicular to the rotating cylinder 22.

[0043] As the rotating rod 24 rotates, the gear 47 meshes with the arc-shaped rack 30 and, under the action of the arc-shaped rack 30, drives the second worm 26 to rotate. When the second worm 26 rotates, it drives the second worm wheel 27 to rotate. The second worm wheel 27 drives the first bevel gear 28 to rotate. The first bevel gear 28 drives the second bevel gear 29 to rotate. The second bevel gear 29 drives the cutting blade 23 to rotate relative to the fixed frame 25. After the rotating rod 24 rotates 90 degrees relative to the rotating cylinder 22, the cutting blade 23 also rotates 90 degrees relative to the fixed frame 25. At this time, the cutting blade 23 is just touching the surface of the housing.

[0044] like Figure 6 As shown, as a further embodiment of the present invention, the rotating mechanism includes a fixed frame 37, which is fixedly connected to the first connecting plate 21 and a motor 38 is fixedly connected inside the fixed frame 37. A first pulley 39 is fixedly connected to the rear end of the output shaft of the motor 38, and a belt 40 is provided on the first pulley 39. A second pulley 41 is fixedly connected to the front end of the first slide rod 33, and the belt 40 meshes with both the first pulley 39 and the two second pulleys 41.

[0045] During operation, when the cutting blade 23 is attached to the surface of the housing, the motor 38 is started. The motor 38 drives the first pulley 39 to rotate. The first pulley 39 drives the two second pulleys 41 to rotate through the belt 40. The second pulleys 41 drive the rotating drum 22 to rotate through the first slide rod 33. When the rotating drum 22 rotates, it will first separate from the housing and drive the cutting blade 23 to cut off the waste material left by the injection molding of the injection tube 8.

[0046] like Figure 3 As shown, as a further embodiment of the present invention, the first driving mechanism includes a second cylinder 42 and four third cylinders 45. The extension end of the second cylinder 42 is fixedly connected to a pusher 43. Threaded rods 44 are symmetrically provided on the upper and lower sides of the pusher 43. The threaded rods 44 are threadedly engaged with the pusher 43 and do not have self-locking properties. The two threaded rods 44 are fixedly connected to two driving rods 16 respectively. The upper and lower sides of the pusher 43 are located directly in front of the upper and lower sides of the first connecting plate 21 respectively. All four third cylinders 45 are fixedly connected to the pusher 43, and the rear end of the third cylinder 45 is fixedly connected to the front template 2.

[0047] During operation, activating the four third cylinders 45 moves the pusher 43 backward. Simultaneously activating the third cylinders 45 activates the second cylinder 42, allowing the second cylinder 42 to extend as the pusher 43 moves backward. As the pusher 43 moves backward, it drives the threaded rods 44 on both the upper and lower sides to rotate, which in turn drives the drive rods 16 on both the upper and lower sides to rotate. When the pusher 43 disengages from the threaded rods 44 and moves to a position behind them, the threaded rods 44 stop rotating. At this point, the pusher 43 is in contact with the upper and lower parts of the first connecting plate 21. As the four third cylinders 45 continue to operate, the pusher 43 is blocked by the first connecting plate 21 and the two rotating cylinders 22, preventing it from moving backward. The four third cylinders 45 then begin to pull the front template 2 forward, causing the front template 2 to detach from the housing.

Claims

1. An injection mold for precision plastic parts of electrical appliances, comprising an inner mold (1), a front mold plate (2), an upper mold plate (3), a lower mold plate (4), a left mold plate (5) and a right mold plate (6), characterized in that: The inner mold (1) is sleeved with a fixed plate (7), and the inner mold (1) and the fixed plate (7) are in sliding connection; the inner mold (1), the front mold plate (2), the upper mold plate (3), the lower mold plate (4), the left mold plate (5) and the right mold plate (6) are combined to form a frame-shaped mold, the frame-shaped mold is sleeved on the inner mold (1), and the rear part of the combined frame-shaped mold is attached to the fixed plate (7); a plurality of injection pipes (8) are fixedly connected to the front position of the front mold plate (2); The frame-shaped mold is provided with a demolding mechanism, which is used to drive the upper mold plate (3), the lower mold plate (4), the left mold plate (5) and the right mold plate (6) to be separated from the shell first when demolding; The frame-shaped mold is provided with a cutting mechanism, which is used to automatically cut off the excess part of the shell at the connection of the injection pipe (8) after the frame-shaped mold is separated from the shell; The front position of the frame-shaped mold is provided with a first driving mechanism, which is used to drive the demolding mechanism and the cutting mechanism to operate; The cutting mechanism comprises a first connecting plate (21), the first connecting plate (21) is located at the front position of the front mold plate (2), and the first connecting plate (21) is rotatably connected with a rotating cylinder (22) at the symmetric positions of the upper and lower sides, the rotating cylinder (22) penetrates through the front mold plate (2) and is in gap fit with the front mold plate (2); the rear end surface of the rotating cylinder (22) is flush with the rear surface of the front mold plate (2), and the rotating cylinder (22) is sleeved with a second spring (46), one end of the second spring (46) is fixedly connected with the first connecting plate (21), and the other end is fixedly connected with the front mold plate (2); the rotating cylinder (22) is provided with a cutting knife (23), the cutting knife (23) is provided with an extension mechanism, the extension mechanism is used to extend the cutting knife (23) to cut off the shell waste; the first connecting plate (21) is provided with a second driving mechanism, the second driving mechanism is used to drive the extension mechanism to operate; the first connecting plate (21) is provided with a rotating mechanism, the rotating mechanism is used to drive the two rotating cylinders (22) to rotate; The stretching mechanism comprises a rotating rod (24) which is located inside the rotating drum (22) and is rotationally connected with the rotating drum (22); the rotating rod (24) is fixedly connected with a fixing frame (25), the cutting knife (23) is located inside the fixing frame (25) and is rotationally connected with the fixing frame (25); the rotating rod (24) is rotationally connected with a second worm (26), the second worm (26) is meshed with a second worm wheel (27), the second worm wheel (27) is coaxially fixedly connected with a first bevel gear (28), and the first bevel gear (28) and the second worm wheel (27) are both rotationally connected with the rotating rod (24); the first bevel gear (28) is meshed with a second bevel gear (29), the second bevel gear (29) is rotationally connected with the fixing frame (25) and is fixedly connected with the cutting knife (23), the two ends of the second worm (26) are fixedly connected with gears (47), and the inner wall of the rotating drum (22) is fixedly connected with arc-shaped racks (30) at positions close to the two gears (47).

2. The injection mold for precision plastic parts of electric appliances according to claim 1, characterized in that: The demolding mechanism comprises two first connecting frames (9) and two second connecting frames (10), the two first connecting frames (9) are symmetrically arranged at upper and lower positions of the front mold plate (2) and are fixedly connected with the front mold plate (2), and the two second connecting frames (10) are symmetrically arranged at left and right positions of the front mold plate (2) and are fixedly connected with the front mold plate (2); the first connecting frame (9) is rotationally connected with a rotating frame (11), and the rotating frames (11) at the upper and lower positions are fixedly connected with the upper mold plate (3) and the lower mold plate (4) respectively; the second connecting frame (10) is slidingly connected with a sliding block (12) and is sleeved with a first spring (13), one end of the first spring (13) is fixedly connected with the sliding block (12) and the other end is fixedly connected with the second connecting frame (10), and the sliding blocks (12) at the left and right positions are fixedly connected with the left mold plate (5) and the right mold plate (6) respectively; the first connecting frame (9) is provided with a rotating mechanism, the rotating mechanism is used for driving the rotating frame (11) to rotate relative to the first connecting frame (9), and the rotating frame (11) is provided with a lock catch mechanism, the lock catch mechanism is used for locking the left mold plate (5) and the right mold plate (6) when the upper mold plate (3) and the lower mold plate (4) are in a closed state.

3. The injection mold for precision plastic parts of electric appliances according to claim 2, characterized in that: The rotating mechanism comprises a first worm (14) which is rotationally connected with the first connecting frame (9) and is meshed with a first worm wheel (15), and the first worm wheel (15) is fixedly connected with the first connecting frame (9); the front end of the first worm (14) is fixedly connected with a driving rod (16).

4. The injection mold for precision plastic parts of electric appliances according to claim 2, characterized in that: The locking mechanism comprises two extension rods (17) which are symmetrically arranged on the left and right sides of the first connecting frame (9), an arc-shaped rod (18) is fixedly connected to the extension rod (17), the arc-shaped rod (18) is outwardly protruding at one end thereof away from the extension rod (17), a first top rod (19) is arranged on the outer side of the arc-shaped rod (18), the first top rod (19) is in abutment with the arc-shaped rod (18), and the first top rods (19) on the left and right sides are fixedly connected with the left and right mold plates (5) and (6) respectively, a second top rod (20) is fixedly connected to the arc-shaped rod (18), and the second top rods (20) on the left and right sides are in abutment with the left and right mold plates (5) and (6) respectively, and when the rotating frame (11) rotates, the rotating frame (11) drives the arc-shaped rod (18) and the second top rod (20) to move through the extension rod (17).

5. The injection mold for precision plastic parts of electric appliances according to claim 1, characterized in that: The second driving mechanism comprises a second connecting plate (31), the second connecting plate (31) is located in front of the first connecting plate (21), two first air cylinders (32) are fixedly connected to the second connecting plate (31), and the telescopic ends of the first air cylinders (32) are fixedly connected with the first connecting plate (21); first sliding rods (33) are sleeved on the two ends of the second connecting plate (31), the first sliding rods (33) are in clearance fit with the second connecting plate (31), and the first sliding rods (33) are fixedly connected with the two rotating cylinders (22) respectively; a connecting ring (34) is sleeved on the first sliding rod (33), the connecting ring (34) is in clearance fit with the first sliding rod (33) and is rotationally connected with the second connecting plate (31), a second sliding rod (35) is fixedly connected to the connecting ring (34), the second sliding rod (35) is in sliding connection with the rotating cylinder (22) and penetrates the rotating cylinder (22), one end of the second sliding rod (35) inside the rotating cylinder (22) is rotationally connected with a connecting rod (36), and the rear end of the connecting rod (36) is rotationally connected with the rotating rod (24); a torsional spring is arranged at the connecting position of the rotating rod (24) and the rotating cylinder (22).

6. The injection mold for precision plastic parts of electric appliances according to claim 5, characterized in that: The rotating mechanism comprises a fixed frame (37), the fixed frame (37) is fixedly connected with the first connecting plate (21), a motor (38) is fixedly connected in the fixed frame (37), a first belt pulley (39) is fixedly connected to the rear end of the output shaft of the motor (38), and a belt (40) is arranged on the first belt pulley (39); a second belt pulley (41) is fixedly connected to the front end of the first sliding rod (33), and the belt (40) is in meshing connection with the first belt pulley (39) and the two second belt pulleys (41).

7. The injection mold for precision plastic parts of electric appliances according to claim 3, characterized in that: Said first driving mechanism includes a second cylinder (42) and four third cylinders (45), the telescopic end of the second cylinder (42) is fixedly connected with a push frame (43), the push frame (43) is symmetrically provided with threaded rods (44) on the upper and lower sides, the threaded rods (44) are in threaded cooperation with the push frame (43) and the threaded rods (44) have no self-locking property; two threaded rods (44) are fixedly connected with two driving rods (16) respectively; the upper and lower side portions of the push frame (43) are located at the front of the upper and lower side portions of the first connecting plate (21) respectively; four third cylinders (45) are fixedly connected with the push frame (43), and the rear end of the third cylinder (45) is fixedly connected with the front mold plate (2).

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