In-mold automatic sprue cutting device

Abstract

The utility model relates to the technical field of a sprue cutting device for an injection mold, and discloses an in-mold automatic sprue cutting device, which comprises a limiting ring, and is characterized in that an injection spraying barrel, a lug, a cutting barrel and a clamping groove in the cutting barrel are matched with one another, and when the injection spraying barrel is pressed down to the bottom, the cutting barrel rotates forwards, so that a first leak hole and a second leak hole coincide; and after injection molding is completed, when the injection molding spraying barrel is pulled out of the interior of the cutting barrel, due to the clamping effect of the clamping groove and the protruding block, the cutting barrel rotates reversely, the first leakage hole and the second leakage hole are staggered again, and therefore the injection molding process is achieved. And the cutting operation of the injection molding sprue is realized through the twisting action of the cutting cylinder in the same horizontal plane, so that the surface of an injection molding part is better protected, collision and collision with the surface of the injection molding part are avoided, and the improvement of the product quality is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of gate cutting devices for injection molds, in particular to an automatic gate cutting device in a mold. Background Art

[0002] The mold gate is the last door for molten plastic to enter the mold cavity through the pouring system. It is the feed channel connecting the diverter and the cavity. It has two functions: first, it controls the flow of plastic melt into the cavity; second, when the injection pressure is withdrawn, it blocks the cavity so that the plastic in the cavity that has not yet cooled and solidified will not flow back. The choice of gate type depends on factors such as the requirements of the product appearance, the constraints of size and shape, and the type of plastic used.

[0003] After the injection molding machine nozzle is filled, the mold gate needs to be blocked and cut off. However, the existing mold gate cutting device is common, which can easily cause collisions on the surface of the injection molded part during gate cutting, resulting in uneven defects on the surface of the injection molded workpiece. Based on this, an in-mold automatic gate cutting device is proposed. Utility Model Content

[0004] In order to solve the technical problem of a gate cutting device for an injection mold, the utility model provides an automatic gate cutting device in a mold.

[0005] The utility model is implemented by the following technical solutions: an automatic in-mold gate cutting device, including a limiting ring, a cutting barrel fixedly connected to the lower side of the limiting ring, a plurality of card slots provided on the inner side of the cutting barrel, the plurality of card slots being distributed in a circular array, a second leakage hole being provided through the bottom of the cutting barrel, a mold gate limiting installation mechanism for limiting the rotation of the cutting barrel being provided on the lower side of the limiting ring, and an injection molding mechanism for injecting molten plastic particles into the mold cavity through the second leakage hole being provided above the limiting ring.

[0006] As a further improvement of the above-mentioned scheme, the mold gate limiting mounting mechanism includes a mold gate mounting platform located below the limiting ring, a limiting groove is provided on the mold gate mounting platform, the limiting ring is rotatably connected to the inner side of the limiting groove, the lower side of the mold gate mounting platform is fixedly connected to the limiting cylinder, the lower side of the limiting cylinder is provided with a first leakage hole, the limiting cylinder is located outside the cutting cylinder, and a torsion spring mechanism is provided between the cutting cylinder and the limiting cylinder to assist the cutting cylinder in automatically resetting.

[0007] As a further improvement of the above scheme, the torsion spring mechanism includes a torsion spring arranged between the cutting cylinder and the limiting cylinder, one end of the torsion spring is fixedly connected to the inner side of the limiting cylinder, and the other end of the torsion spring is fixedly connected to the outer side of the cutting cylinder, and the main body of the torsion spring is sleeved on the outer side of the cutting cylinder.

[0008] As a further improvement of the above scheme, the injection molding mechanism includes an injection molding nozzle located above the cutting cylinder, the injection molding nozzle is fixedly connected to the injection molding machine, the outer side of the injection molding nozzle is provided with a pushing block mechanism for pushing the cutting cylinder to rotate, and the lower side of the injection molding nozzle is provided with a docking tube mechanism for injecting molten plastic particles into the mold cavity.

[0009] As a further improvement of the above solution, the pushing block mechanism includes a plurality of protrusions fixedly connected to the outer side of the injection nozzle, the protrusions are distributed in a circular array, and each protrusion is paired with each slot.

[0010] As a further improvement of the above solution, the butt joint mechanism includes a nozzle connected to the lower side of the injection nozzle;

[0011] When the injection nozzle is located at an initial position above the cutting tube, the first leak hole and the second leak hole are staggered, and the mold cavity is in a blocked and sealed state;

[0012] When the injection molding nozzle leaves its initial position and presses down along the inner side of the cutting cylinder, the protrusion slides along the slot and pushes the cutting cylinder to rotate until the first leakage hole and the second leakage hole are located on the same vertical line. At this time, the nozzle is inserted into the vertical space formed by the first leakage hole and the second leakage hole, the mold cavity and the nozzle are in a connected state, and the injection molding nozzle can inject molten plastic particles into the mold cavity.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. The utility model cooperates with the injection nozzle, the protrusion and the cutting barrel as well as the internal card grooves. When the injection nozzle is pressed down to the bottom, the cutting barrel rotates forward, so that the first leakage hole and the second leakage hole coincide with each other, and the nozzle passes through the first leakage hole and the second leakage hole and communicates with the mold cavity to realize the injection molding process. After the injection molding is completed, when the injection nozzle is pulled out from the inside of the cutting barrel, due to the positioning effect of the card groove and the protrusion, the cutting barrel reverses and the first leakage hole and the second leakage hole are staggered again. The cutting operation of the injection molding gate is realized by the twisting action of the cutting barrel in the same horizontal plane, which has a better protection effect on the surface of the injection molded part, avoids bumps and collisions with the surface of the injection molded part, and helps to improve the quality of the product.

[0015] 2. The utility model realizes the forward and reverse rotation of the cutting cylinder by pressing down and raising the injection nozzle and the bump, and provides limiting support for the rotation of the cylinder by opening a limiting groove on the mold gate mounting table. This kind of rotation connection based on internal limit has better mechanical precision and better wear resistance, which can effectively improve the service life of the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1This is a front view of an in-mold automatic gate cutting device provided by the utility model;

[0017] Figure 2 for Figure 1 A top view of

[0018] Figure 3 for Figure 1 Schematic diagram of the explosion structure;

[0019] Figure 4 for Figure 3 A top view of

[0020] Figure 5 It is a cross-sectional view of the mid-cut cylinder (10) of the present utility model.

[0021] Description of main symbols:

[0022] 1. Mold gate mounting platform; 2. First leakage hole; 3. Nozzle; 4. Bump; 5. Injection nozzle; 6. Slot; 7. Limiting ring; 8. Second leakage hole; 9. Torsion spring; 10. Cutting cylinder; 11. Limiting cylinder; 12. Limiting groove. DETAILED DESCRIPTION

[0023] Below, the present invention is further described in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0024] Example:

[0025] Please combine Figure 1-Figure 5 , an in-mold automatic gate cutting device of this embodiment includes a limiting ring 7, a cutting cylinder 10 is fixedly connected to the lower side of the limiting ring 7, four card slots 6 are opened on the inner side of the cutting cylinder 10, and the four card slots 6 are distributed in a circular array. A second leakage hole 8 is opened through the bottom of the cutting cylinder 10, and a mold gate limiting installation mechanism for limiting the rotation of the cutting cylinder 10 is provided on the lower side of the limiting ring 7. An injection molding mechanism for injecting molten plastic particles into the mold cavity through the second leakage hole 8 is provided above the limiting ring 7.

[0026] It is important to note that the track composition of the slot 6 is as follows: Figure 5 As shown, the upper half of the slot 6 is a straight groove, while the lower half is a downwardly inclined curved groove track. The lower half of the slot 6 can ensure that the cutting cylinder 10 rotates 90 degrees in this embodiment. In other embodiments, the number of slots 6 provided on the inner side of the cutting cylinder 10 and the angle of the staggered second leakage hole 8 and the first leakage hole 2 have a quantitative proportional relationship. That is, the rotation angle of the cutting cylinder 10 driven by the curved groove in the lower half of the slot 6 must coincide with the angle of the staggered second leakage hole 8 and the first leakage hole 2.

[0027] When the protrusion 4 is in the straight groove of the card slot 6, the cutting cylinder 10 does not rotate, and the injection nozzle 5 descends vertically. When the protrusion 4 descends to the curved track groove of the card slot 6, the protrusion 4 starts to push the cutting cylinder 10 to rotate.

[0028] Please combine Figure 4 As shown, the mold gate limiting mounting mechanism includes a mold gate mounting platform 1 located below the limiting ring 7, a limiting groove 12 is provided on the mold gate mounting platform 1, the limiting ring 7 is rotatably connected to the inner side of the limiting groove 12, and a limiting cylinder 11 is fixedly connected to the lower side of the mold gate mounting platform 1. A first leakage hole 2 is provided on the lower side of the limiting cylinder 11, and the limiting cylinder 11 is located outside the cutting cylinder 10. A torsion spring mechanism is provided between the cutting cylinder 10 and the limiting cylinder 11 to assist the cutting cylinder 10 in automatically resetting.

[0029] Please combine Figure 3 As shown, the torsion spring mechanism includes a torsion spring 9 arranged between the cutting cylinder 10 and the limiting cylinder 11. One end of the torsion spring 9 is fixedly connected to the inner side of the limiting cylinder 11, and the other end of the torsion spring 9 is fixedly connected to the outer side of the cutting cylinder 10. The main body of the torsion spring 9 is sleeved on the outer side of the cutting cylinder 10.

[0030] It should be noted that the torsion spring 9 here plays an auxiliary positioning role for the cutting cylinder 10 in the limiting cylinder 11. When the injection nozzle 5 rises upward again, the cutting cylinder 10 can also be reversed and reset. However, in order to ensure that the protrusion 4 can smoothly and accurately enter the slot 6 at the entrance of the limiting ring 7 next time, the elastic effect of the torsion spring 9 itself can be used to play a calibration role.

[0031] Please combine Figure 1 As shown, the injection molding mechanism includes an injection molding nozzle 5 located above the cutting cylinder 10, the injection molding nozzle 5 is fixedly connected to the injection molding machine, and a pushing block mechanism for pushing the cutting cylinder 10 to rotate is provided on the outside of the injection molding nozzle 5, and a docking tube mechanism for injecting molten plastic particles into the mold cavity is provided on the lower side of the injection molding nozzle 5.

[0032] Please combine Figure 1 As shown, the block pushing mechanism includes four protrusions 4 fixedly connected to the outside of the injection nozzle 5. The protrusions 4 are distributed in a circular array, and each protrusion 4 is paired with each slot 6.

[0033] Please combine Figure 1 and Figure 3 As shown, the butt joint mechanism includes a nozzle 3 connected to the lower side of the injection nozzle 5;

[0034] When the injection nozzle 5 is located at the initial position above the cutting cylinder 10, the first leakage hole 2 and the second leakage hole 8 are staggered, and the mold cavity is in a blocked and sealed state;

[0035] When the injection nozzle 5 leaves its initial position and presses down along the inner side of the cutting cylinder 10, the protrusion 4 slides along the slot 6 and pushes the cutting cylinder 10 to rotate until the first leakage hole 2 and the second leakage hole 8 are located on the same vertical line. At this time, the nozzle 3 is inserted into the vertical space formed by the first leakage hole 2 and the second leakage hole 8. The mold cavity and the nozzle 3 are in a connected state, and the injection nozzle 5 can inject molten plastic particles into the mold cavity.

[0036] The implementation principle of an in-mold automatic gate cutting device in the embodiment of the present application is as follows: the mold gate mounting platform 1 is docked on the outer surface of the mold, the limiting cylinder 11 is installed on the lower side of the mold gate mounting platform 1, and then the limiting ring 7 and the cutting cylinder 10 are inserted into the limiting groove 12 opened on the mold gate mounting platform 1. Since the cutting cylinder 10 is rotatably connected to the inner side of the limiting groove 12, when the injection nozzle 5 is pressed down, the side protrusion 4 enters the inner side of the card slot 6 and abuts and pushes with the inner side of the card slot 6. When it encounters the card slot 6, the track direction changes from a straight line to a When the injection nozzle 5 is in an inclined curve, since the injection nozzle 5 is fixedly installed on the injection molding machine, the cutting cylinder 10 rotates at this time, causing the first leakage hole 2 and the second leakage hole 8 to coincide with each other. At this time, the nozzle 3 connected to the lower side of the injection nozzle 5 just passes through the space between the first leakage hole 2 and the second leakage hole 8, forming an internal connection with the mold cavity, and the molten plastic particles can be injected into the mold; on the contrary, when the injection nozzle 5 rises, the cutting cylinder 10 reverses at this time, and the first leakage hole 2 and the second leakage hole 8 are staggered again, realizing the cutting off of the gate, thereby achieving the blocking and cutting off of the mold cavity.

[0037] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. An in-mold automatic gate cutting device, comprising a limiting ring (7), characterized in that: The lower side of the limiting ring (7) is fixedly connected to the cutting cylinder (10), the inner side of the cutting cylinder (10) is provided with a plurality of slots (6), and the plurality of slots (6) are distributed in a circular array. The bottom of the cutting cylinder (10) is provided with a second leakage hole (8). The lower side of the limiting ring (7) is provided with a mold gate limiting installation mechanism for limiting the rotation of the cutting cylinder (10), and the upper side of the limiting ring (7) is provided with an injection molding mechanism for injecting molten plastic particles into the mold cavity through the second leakage hole (8).

2. The in-mold automatic gate cutting device according to claim 1, characterized in that: The mold gate limiting mounting mechanism includes a mold gate mounting platform (1) located below the limiting ring (7), a limiting groove (12) is provided on the mold gate mounting platform (1), the limiting ring (7) is rotatably connected to the inner side of the limiting groove (12), the lower side of the mold gate mounting platform (1) is fixedly connected to the limiting cylinder (11), the lower side of the limiting cylinder (11) is provided with a first leakage hole (2), the limiting cylinder (11) is located outside the cutting cylinder (10), and a torsion spring mechanism is provided between the cutting cylinder (10) and the limiting cylinder (11) to assist the cutting cylinder (10) in automatically resetting.

3. The automatic in-mold gate cutting device according to claim 2, characterized in that: The torsion spring mechanism comprises a torsion spring (9) arranged between the cutting cylinder (10) and the limiting cylinder (11), one end of the torsion spring (9) is fixedly connected to the inner side of the limiting cylinder (11), and the other end of the torsion spring (9) is fixedly connected to the outer side of the cutting cylinder (10), and the main body of the torsion spring (9) is sleeved on the outer side of the cutting cylinder (10).

4. The automatic in-mold gate cutting device according to claim 3, characterized in that: The injection molding mechanism comprises an injection molding nozzle (5) located above the cutting cylinder (10), the injection molding nozzle (5) is fixedly connected to the injection molding machine, the outer side of the injection molding nozzle (5) is provided with a push block mechanism for pushing the cutting cylinder (10) to rotate, and the lower side of the injection molding nozzle (5) is provided with a docking tube mechanism for injecting molten plastic particles into the mold cavity.

5. The automatic in-mold gate cutting device according to claim 4, characterized in that: The pushing block mechanism comprises a plurality of protrusions (4) fixedly connected to the outside of the injection molding nozzle (5), the protrusions (4) being distributed in a circular array, and each protrusion (4) being paired with each of the slots (6).

6. The automatic in-mold gate cutting device according to claim 5, characterized in that: The butt joint mechanism includes a nozzle (3) connected to the lower side of the injection spray barrel (5); When the injection spray cylinder (5) is located at an initial position above the cutting cylinder (10), the first leakage hole (2) and the second leakage hole (8) are staggered, and the mold cavity is in a blocked and sealed state; When the injection molding nozzle (5) leaves the initial position and is pressed down along the inner side of the cutting cylinder (10), the protrusion (4) slides along the slot (6) and pushes the cutting cylinder (10) to rotate until the first leakage hole (2) and the second leakage hole (8) are located on the same vertical line. At this time, the nozzle (3) is inserted into the vertical space formed by the first leakage hole (2) and the second leakage hole (8), the mold cavity and the nozzle (3) are in a connected state, and the injection molding nozzle (5) can inject molten plastic particles into the mold cavity.

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