Gear injection molding demolding mechanism

Abstract

The utility model relates to a gear injection molding demoulding mechanism in the technical field of demoulding devices. The lower mold comprises a fixed mold plate, a plurality of helical tooth shaping cavities are formed in the upper end of the fixed mold plate, and a demolding device is installed in the middle of the fixed mold plate. After injection molding of the bevel gear is completed, a motor is started to drive a reciprocating lead screw to rotate, and a spiral groove in the lower end of the reciprocating lead screw is matched with a first lead screw nut to drive a second fixing plate to move downwards, so that a shaft rod synchronously moves downwards, and the upper end of the shaft rod is conveniently separated from a middle hole of the bevel gear; a spiral groove in the upper end of a reciprocating lead screw is matched with a second lead screw nut to drive a third fixing plate to move upwards, a connecting plate is matched with a connecting ring to push a connecting block upwards, a sliding block synchronously slides in a groove cavity of an inclined groove to drive the connecting block to rotate, and a pushing block rotates while pushing a bevel gear upwards; and the bevel gear can be conveniently separated from a cavity body of the bevel gear shaping cavity, so that teeth of the bevel gear are protected, and the teeth are prevented from being damaged.

Description

Technical Field

[0001] The utility model relates to the technical field of demoulding devices, in particular to a demoulding mechanism for gear injection molding. Background Technique

[0002] An injection mold is a tool for producing plastic products. Injection molding is a processing method used when mass-producing some complex-shaped parts. Specifically, it means injecting the heat-melted plastic into the mold cavity under high pressure by an injection molding machine. After cooling and solidifying, the formed product is obtained. The injection mold is composed of a moving mold and a fixed mold. The moving mold is installed on the moving template of the injection molding machine, and the fixed mold is installed on the fixed template of the injection molding machine. When injection molding, the moving mold and the fixed mold are closed to form a gating system and a cavity. When the mold is opened, the moving mold and the fixed mold are separated to take out the plastic product.

[0003] Gears include spur gears and helical gears. Existing injection molds all use direct ejection during demoulding, and due to the tooth profile, helical gears are prone to tooth damage during direct ejection. Content of the Utility Model

[0004] To solve the problem that the teeth of helical gears are easily damaged during direct ejection as mentioned in the above background technique, the utility model provides the following technical solutions:

[0005] A demoulding mechanism for gear injection molding includes an upper mold;

[0006] A lower mold for cooperating with the upper mold to shape the helical gear is installed at the lower end of the upper mold.

[0007] The lower mold includes a fixed template. A plurality of helical tooth shaping cavities are opened at the upper end of the fixed template, and a demoulding device is installed in the middle of the fixed template.

[0008] The demoulding device includes a push block for pushing the helical gear out of the helical tooth shaping cavity. A shaft rod for limiting the push block is installed in the middle of the push block, and an inclined groove for controlling the rotation of the push block is opened at the upper end of the shaft rod.

[0009] The demoulding device includes a lead screw nut one and a lead screw nut two.

[0010] The lower mold includes a reciprocating lead screw for cooperating with the lead screw nut one to control the downward movement of the shaft rod, and the reciprocating lead screw cooperates with the lead screw nut two to synchronously control the upward movement of the push block.

[0011] Further, the upper mold includes a moving template. A fixed plate one is installed at the upper end of the moving template, and a cylinder is installed at the upper end of the fixed plate one.

[0012] Further, a limiting frame for supporting and limiting the fixed template is installed at the lower end of the fixed template.

[0013] Further, a second fixing plate for limiting the first lead screw nut is installed on the outer wall of the first lead screw nut.

[0014] Further, a connecting block is installed at the lower end of the push block, and a sliding block for sliding in the cavity of the inclined groove is installed inside the connecting block.

[0015] Further, a connecting ring for pushing and pulling the push block in cooperation with the second lead screw nut is installed at the lower end of the connecting block, and a limiting ring is installed at the upper end of the connecting ring, and the cross section of the limiting ring is L-shaped.

[0016] Further, a third fixing plate for limiting the second lead screw nut is installed on the outer wall of the second lead screw nut, and a plurality of connecting plates for limiting the connecting ring are installed on the side wall of the third fixing plate.

[0017] Further, the helix directions of the spiral grooves at the upper and lower ends of the reciprocating lead screw are opposite, and a motor for controlling the rotation of the reciprocating lead screw is installed at the lower end of the reciprocating lead screw.

[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0019] After the helical gear is injection-molded, the motor is started to drive the reciprocating lead screw to rotate. The spiral groove at the lower end of the reciprocating lead screw cooperates with the first lead screw nut to drive the second fixing plate to move downward, so that the shaft rod moves downward synchronously, facilitating the upper end of the shaft rod to disengage from the middle hole of the helical gear. At the same time, the spiral groove at the upper end of the reciprocating lead screw cooperates with the second lead screw nut to drive the third fixing plate to move upward, so that the connecting plate cooperates with the connecting ring to push the connecting block upward, and the sliding block slides synchronously in the cavity of the inclined groove, driving the connecting block to rotate, so that the push block rotates while pushing the helical gear upward, facilitating the helical gear to disengage from the cavity of the helical tooth shaping cavity, thereby protecting the teeth of the helical gear and avoiding tooth damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0021] Figure 2 is a schematic diagram of the structure of the upper mold of the present utility model;

[0022] Figure 3 is a schematic diagram of the structure of the lower mold of the present utility model;

[0023] Figure 4 is a schematic diagram of the structure of the demolding device of the present utility model;

[0024] Figure 5 is a schematic diagram of the structure of the shaft rod of the present utility model;

[0025] Figure 6 is of the present utility model Figure 4Enlarged view of part A

[0026] In the attached drawings, the list of component names represented by each reference numeral is as follows:

[0027] 001 - Upper die

[0028] 100 - Moving template, 110 - Fixed plate I, 111 - Cylinder

[0029] 002 - Lower die

[0030] 200 - Fixed template, 210 - Helical tooth sizing cavity, 220 - Limiting frame

[0031] 300 - Demolding device, 310 - Lead screw nut I, 311 - Fixed plate II, 320 - Shaft rod, 321 - Oblique groove, 330 - Pusher block, 331 - Connecting block, 332 - Slide block, 340 - Connecting ring, 341 - Limiting ring, 350 - Lead screw nut II, 351 - Fixed plate III, 352 - Connecting plate

[0032] 400 - Reciprocating lead screw, 410 - Motor Specific embodiments

[0033] The preferred specific embodiments for implementing the present utility model are described in detail below, and a clear and complete description is made in conjunction with the attached drawings.

[0034] Please refer to Figures 1-6 , the present utility model provides a gear injection molding demolding mechanism, including an upper die 001 and a lower die 002, and through the cooperation of a reciprocating lead screw 400 and a demolding device 300, when the reciprocating lead screw 400 rotates, the fixed plate II 311 drives the shaft rod 320 to move downward, so that the upper end of the shaft rod 320 disengages from the middle hole of the helical gear. While the reciprocating lead screw 400 rotates, the connecting plate 352 cooperates with the connecting ring 340 to drive the connecting block 331 to move upward, so that the pusher block 330 pushes the helical gear out of the groove cavity of the helical tooth sizing cavity 210. While the pusher block 330 moves upward, the slide block 332 rotates under the guidance of the oblique groove 321, facilitating the synchronous driving of the helical gear to rotate upward, so as to protect the teeth of the helical gear and avoid tooth damage.

[0035] The upper die 001 includes a moving template 100, and a fixed plate I 110 is fixedly installed at the upper end of the moving template 100, and a cylinder 111 for pushing the moving template 100 downward is fixedly installed at the upper end of the fixed plate I 110.

[0036] A lower die 002 for cooperating with the upper die 001 to shape the helical gear is installed at the lower end of the upper die 001. The lower die 002 includes a fixed template 200. A plurality of helical tooth shaping cavities 210 are formed at the upper end of the fixed template 200. A limiting frame 220 for supporting and limiting the fixed template 200 is installed at the lower end of the fixed template 200. And a guide rod body for guiding the first fixing plate 110 is installed at the upper end of the limiting frame 220.

[0037] A demolding device 300 is installed in the middle of the fixed template 200. The demolding device 300 includes a lead screw nut 310. A second fixing plate 311 for limiting the lead screw nut 310 is fixedly installed on the outer wall of the lead screw nut 310. A shaft rod 320 for limiting the push block 330 is installed in the middle of the push block 330. And a plurality of shaft rods 320 are fixedly installed at the upper end of the lead screw nut 310. The shaft rods 320 are located in the middle of the hole cavity of the helical tooth shaping cavity 210. An inclined groove 321 for controlling the rotation of the push block 330 is formed at the upper end of the shaft rod 320. When the connecting ring 340 pushes the push block 330 upward and the slider 332 moves from the bottom of the inclined groove 321 to the top of the inclined groove 321, the connecting block 331 is synchronously driven to rotate. The connecting block 331 drives the push block 330 to rotate, thereby pushing the helical gear.

[0038] The demolding device 300 includes a push block 330 for pushing the helical gear out of the helical tooth shaping cavity 210. A connecting block 331 is fixedly installed at the lower end of the push block 330. A slider 332 for sliding in the inclined groove 321 is fixedly installed on the inner wall of the lower end of the connecting block 331.

[0039] A connecting ring 340 for cooperating with the second lead screw nut 350 to push and pull the push block 330 is installed at the lower end of the connecting block 331. A limiting ring 341 is fixedly installed at the upper end of the connecting ring 340. And the cross section of the limiting ring 341 is L-shaped. An annular groove for the limiting ring 341 to rotate is formed at the lower end of the connecting block 331.

[0040] The demolding device 300 includes a second lead screw nut 350. A third fixing plate 351 for limiting the second lead screw nut 350 is fixedly installed on the outer wall of the second lead screw nut 350. A plurality of connecting plates 352 for limiting the connecting ring 340 are fixedly installed on the side wall of the third fixing plate 351. And one end of the connecting plate 352 is fixedly installed on the outer wall of the connecting ring 340, facilitating the connecting ring 340 to move up and down when the second lead screw nut 350 moves up and down, cooperating with the third fixing plate 351 and the connecting plates 352.

[0041] The lower die 002 includes a reciprocating lead screw 400 for cooperating with the lead screw nut 310 to control the downward movement of the shaft rod 320, and the reciprocating lead screw 400 cooperates with the lead screw nut 350 to synchronously control the upward movement of the push block 330. The helix directions of the spiral grooves at the upper and lower ends of the reciprocating lead screw 400 are opposite, and a motor 410 for controlling the rotation of the reciprocating lead screw 400 is installed at the lower end of the reciprocating lead screw 400.

[0042] After the helical gear is injection-molded, the motor 410 is started to drive the reciprocating lead screw 400 to rotate. The spiral groove at the lower end of the reciprocating lead screw 400 cooperates with the lead screw nut 310 to drive the fixing plate 311 downward, so that the shaft rod 320 moves downward synchronously, facilitating the upper end of the shaft rod 320 to disengage from the central hole of the helical gear. At the same time, the spiral groove at the upper end of the reciprocating lead screw 400 cooperates with the lead screw nut 350 to drive the fixing plate 351 upward, so that the connecting plate 352 cooperates with the connecting ring 340 to push the connecting block 331 upward, and the slider 332 slides synchronously in the cavity of the inclined groove 321, driving the connecting block 331 to rotate, so that the push block 330 rotates while pushing the helical gear upward, facilitating the helical gear to disengage from the cavity of the helical tooth shaping cavity 210 to protect the teeth of the helical gear and avoid tooth damage.

[0043] Based on the above content and the drawings, those skilled in the art can understand and implement the present invention. In addition, any non-creative modifications made to the present invention by those skilled in the art without creative efforts still fall within the protection scope of the present invention.

Claims

1. A gear injection molding demoulding mechanism, comprising an upper mold (001), characterized in that: A lower die (002) is installed at the lower end of the upper die (001) for cooperating with the upper die (001) to shape the helical gear; The lower mold (002) comprises a fixed mold plate (200), a plurality of helical tooth molding cavities (210) are provided at the upper end of the fixed mold plate (200), and a demoulding device (300) is installed in the middle of the fixed mold plate (200); The demoulding device (300) comprises a push block (330) for pushing the helical gear out of the helical gear molding cavity (210); a shaft (320) for limiting the push block (330) is installed in the middle of the push block (330); and an inclined groove (321) for controlling the rotation of the push block (330) is provided at the upper end of the shaft (320); The demoulding device (300) comprises a lead screw nut 1 (310) and a lead screw nut 2 (350); The lower mold (002) includes a reciprocating screw (400) for cooperating with screw nut 1 (310) to control the shaft (320) to move downward, and the reciprocating screw (400) cooperates with screw nut 2 (350) to synchronously control the push block (330) to move upward.

2. A gear injection molding demoulding mechanism according to claim 1, characterized in that: The upper mold (001) comprises a movable mold plate (100), a fixed plate one (110) is installed at the upper end of the movable mold plate (100), and a cylinder (111) is installed at the upper end of the fixed plate one (110).

3. A gear injection molding demoulding mechanism according to claim 1, characterized in that: A limiting frame (220) for supporting and limiting the fixed template (200) is installed at the lower end of the fixed template (200).

4. The gear injection molding demoulding mechanism according to claim 1, characterized in that: The outer wall of the lead screw nut 1 (310) is provided with a fixing plate 2 (311) for limiting the position of the lead screw nut 1 (310).

5. The gear injection molding demoulding mechanism according to claim 1, characterized in that: A connecting block (331) is installed at the lower end of the push block (330), and a sliding block (332) for sliding in the groove cavity of the inclined groove (321) is installed inside the connecting block (331).

6. A gear injection molding demoulding mechanism according to claim 5, characterized in that: The lower end of the connecting block (331) is provided with a connecting ring (340) for cooperating with the second lead screw nut (350) to push and pull the push block (330), and the upper end of the connecting ring (340) is provided with a limiting ring (341), and the cross section of the limiting ring (341) is L-shaped.

7. A gear injection molding demoulding mechanism according to claim 6, characterized in that: The outer wall of the screw nut 2 (350) is installed with a fixing plate 3 (351) for limiting the position of the screw nut 2 (350), and the side wall of the fixing plate 3 (351) is installed with a plurality of connecting plates (352) for limiting the position of the connecting ring (340).

8. The gear injection molding demoulding mechanism according to claim 1, characterized in that: The spiral grooves at the upper and lower ends of the reciprocating screw (400) have opposite rotation directions, and a motor (410) for controlling the reciprocating screw (400) to rotate is installed at the lower end of the reciprocating screw (400).

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