Plastic nozzle cutting mechanism

Abstract

The present invention discloses a plastic water outlet cutting mechanism, which belongs to the technical field of injection molding machines, and comprises: a frame, a connecting pipe and a cutting knife, wherein the two ends of the connecting pipe are respectively used to connect the injection hole of the injection mold and the discharge port of the plastic extruder; the cutting knife is arranged on the frame and is used to cut the water outlet; the cutting knife can rotate around the axis of the injection hole. The connecting pipe of the present invention can connect the injection hole of the injection mold and the discharge port of the plastic extruder, and the connecting pipe and the injection hole are separable. When the connecting pipe is away from the injection hole, the water outlet on the plastic part formed by the injection mold is exposed, and at this time the cutting knife can move and rotate toward the lower edge of the injection hole, i.e., the root of the water outlet, to perform rotary cutting on the water outlet, thereby completing the water outlet cutting work before demoulding, without the need for subsequent clamping and cutting.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding machines, and in particular to a plastic sprue cutting mechanism. Background Art

[0002] For home appliance plastic parts, injection molding machines are usually used for production. The injection molding machine is equipped with an injection mold, which includes a male mold and a female mold. Generally, the discharge port of the plastic extruder is directly fixedly connected to the male mold or the female mold, and the plastic extruder squeezes molten plastic into the cavity formed by the male mold and the female mold. When the male mold is separated from the female mold, the plastic part can be taken out, and at this time, the plastic part has a sprue. The sprue refers to the redundant part formed during the injection molding process that connects the plastic part to the injection mold.

[0003] Currently, sprues on plastic parts are usually trimmed manually, which is time-consuming and the quality of the sprue trimming is difficult to control. There are also some sprue cutting equipment that can perform cutting, but the existing sprue cutting equipment requires the plastic parts to be positioned and clamped before cutting, which is time-consuming to use.

[0004] Therefore, we propose a plastic nozzle cutting mechanism. Summary of the invention

[0005] In view of the above-mentioned technical deficiencies, an object of the present invention is to provide a plastic sprue cutting mechanism, which can cut off the sprue on the plastic part during the injection molding process.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solution: The present invention provides a plastic nozzle cutting mechanism, comprising:

[0007] frame;

[0008] A connecting pipe, wherein the connecting pipe has the freedom to reciprocate on the frame, and the two ends of the connecting pipe are respectively used to connect the injection hole of the injection mold and the discharge port of the plastic extruder;

[0009] One or more cutting knives, which are arranged on the frame and used for cutting the water outlet; the cutting knives can rotate around the axis of the injection hole;

[0010] Among them, the connecting tube and the injection hole have two matching states. In the first state, the connecting tube is against the injection mold, so that the inner cavity of the connecting tube is connected with the injection hole; in the second state, the connecting tube is away from the injection hole; when the connecting tube is in the second state, the cutting knife can move toward the injection hole so that the blade of the cutting knife is located on the diameter of the lower edge of the injection hole.

[0011] Preferably, the injection hole is trumpet-shaped, and the diameter of the lower edge of the injection hole is smaller than the diameter of the upper edge of the injection hole.

[0012] Preferably, a sliding sleeve is fixed on the frame, the connecting tube is movably plugged into the sliding sleeve, and one end of the connecting tube close to the injection hole is provided with a conical surface matching the injection hole.

[0013] Preferably, a first cylinder is fixed on the frame, the first cylinder is parallel to the connecting pipe, and the movable end of the first cylinder is fixedly connected to the connecting pipe.

[0014] Preferably, a rotating sleeve is rotatably mounted on the frame, the rotating sleeve is coaxial with the connecting pipe, and guide sleeves corresponding to the number of cutting knives are fixed on one end of the rotating sleeve close to the injection mold, and the cutting knives are slidably mounted on the corresponding guide sleeves.

[0015] Preferably, a movable sleeve is slidably installed in the rotating sleeve, the rotating sleeve is splined with the movable sleeve, a guide block is fixed on the movable sleeve, a guide groove is provided on the guide block, and a shaft body slidably matched with the guide groove is fixed on the cutting knife; when the movable sleeve moves on the rotating sleeve, the cutting knife moves on the guide sleeve.

[0016] Preferably, a second cylinder is fixed on the frame, a limit ring is fixed on the movable end of the second cylinder, and the limit ring is rotatably mounted on the movable sleeve; when the second cylinder is working, the second cylinder drives the movable sleeve to move on the rotating sleeve.

[0017] Preferably, a gear ring is fixed on the rotating sleeve, and a driving gear meshing with the gear ring is provided on the frame.

[0018] Preferably, an air outlet pipe is provided on the frame, the air outlet pipe is connected to an external air supply device, and the air outlet pipe blows air between the cutting knives.

[0019] Preferably, the length of the cutting blade of the cutting knife is greater than or equal to the radius of the lower edge of the injection hole.

[0020] The beneficial effect of the present invention is that the connecting tube of the present invention can connect the injection hole of the injection mold and the discharge port of the plastic extruder, and the connecting tube and the injection hole are separable. When the connecting tube is away from the injection hole, the nozzle part on the plastic part formed in the injection mold will be exposed. At this time, the cutting knife can move and rotate toward the lower edge of the injection hole, that is, the root of the nozzle, and perform rotary cutting on the nozzle, so that the nozzle removal work can be completed before demolding, without the need for subsequent clamping and cutting. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic diagram of the cooperation between a plastic sprue cutting mechanism and an injection mold provided in an embodiment of the present invention.

[0023] Figure 2 It is a cross-sectional view of the injection hole of the present invention on the injection mold.

[0024] Figure 3 It is a front-view stereogram of the present invention.

[0025] Figure 4 It is a rear-view perspective stereogram of the present invention.

[0026] Figure 5 It is a front view of the present invention.

[0027] Figure 6 It is a side view of the present invention.

[0028] Figure 7 It is a stereoscopic diagram of the rotating sleeve, movable sleeve and guide block of the present invention.

[0029] Figure 8 It is a schematic diagram of the cutting knife of the present invention cutting off the water outlet on the surface of a plastic part.

[0030] Fig. 9 It is a schematic diagram of the connecting tube and the liquid injection hole of the present invention when they are in the first state.

[0031] Fig.10 It is a schematic diagram of the connecting tube and the liquid injection hole of the present invention when they are in the second state.

[0032] Description of reference numerals:

[0033] 1. Frame, 2. Connecting pipe, 3. Injection mold, 4. Injection hole, 5. Cutting knife, 6. Lower edge, 7. Upper edge, 8. Sliding sleeve, 9. Conical surface, 10. First cylinder, 11. Rotating sleeve, 12. Guide sleeve, 13. Movable sleeve, 14. Guide block, 15. Guide groove, 16. Shaft, 17. Second cylinder, 18. Limiting ring, 19. Gear ring, 20. Driving gear, 21. Exhaust pipe, 22. Blade, 23. Plastic part, 24. Water outlet. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Embodiment 1:

[0036] like Figures 1 to 10 As shown, the first embodiment of the present invention provides a plastic sprue cutting mechanism, which can complete the cutting of the sprue 24 on the plastic part 23 during the injection molding process, thereby eliminating the need to re-clamp the plastic part 23 to cut the sprue 24 during the subsequent processing. The present invention specifically includes a frame 1, a connecting pipe 2 and a cutting device, wherein the frame 1 plays a role of fixed support, a sliding sleeve 8 is fixed on the frame 1, the connecting pipe 2 is made of a rigid material, and the connecting pipe 2 is inserted into the sliding sleeve 8 and can reciprocate along the sliding sleeve 8. In order to drive the connecting pipe 2 to move, as shown in FIG. Figure 6 As shown, the present invention has a first cylinder 10 fixedly mounted on the frame 1, the first cylinder 10 is parallel to the connecting pipe 2, and the movable end of the first cylinder 10 is fixedly connected to the connecting pipe 2, so that when the first cylinder 10 works, it can drive the connecting pipe 2 to move on the sliding sleeve 8.

[0037] The function of the connecting pipe 2 of the present invention is to connect the injection hole 4 of the injection mold 3 and the discharge port of the plastic extruder. The injection mold 3 adopts an existing mold, generally including a male mold and a female mold, the male mold and the female mold are connected to form a complete cavity, and one of the male mold and the female mold can be movable, so that the cavity can be opened to take out the molded plastic part 23. The injection mold 3 in the prior art is relatively mature, and the improvement of the injection mold 3 of the present invention lies in the injection hole 4 of the injection mold 3.

[0038] like Figure 2 As shown, the injection hole 4 is connected to the cavity of the injection mold 3 and is trumpet-shaped, that is, the upper edge 7 and the lower edge 6 of the injection hole 4 are both circular and the diameter of the upper edge 7 is greater than the diameter of the lower edge 6 .

[0039] The connecting tube 2 of the present invention has a conical surface 9 at one end that matches the injection hole 4. Figure 2 and Fig. 9 It can be seen that the conical surface 9 of the connecting tube 2 can be against the injection hole 4, so that the inner cavity of the connecting tube 2 is connected to the cavity of the injection mold 3 through the injection hole 4, and the end of the connecting tube 2 away from the injection hole 4 is connected to the discharge port of the plastic extruder, so that the molten plastic extruded by the plastic extruder can enter the cavity through the connecting tube 2. When the molten plastic is cooled in the injection mold 3, the molten plastic in the inner cavity of the connecting tube 2 near the injection hole 4 will also be cooled, thereby forming a sprue 24. Since the inner cavity of the connecting tube 2 is cylindrical, the sprue 24 is also cylindrical, and the cylindrical shape has a draft angle, which is not a cylinder in the strict sense.

[0040] like Fig. 9 and Fig.10As shown, when the connecting tube 2 is away from the injection hole 4, the formed sprue 24 will be separated from the connecting tube 2. The cutting device designed in the present invention cuts the formed sprue 24 after the connecting tube 2 is separated from the injection hole 4. In this way, when the plastic part 23 is taken out from the cavity of the injection mold 3, the sprue 24 is removed from the plastic part 23.

[0041] The cutting device of the present invention comprises a rotating sleeve 11 rotatably mounted on a frame 1 through a bearing seat, a guide sleeve 12 is fixed to one end of the rotating sleeve 11 close to the injection hole 4, a cutting knife 5 is movably inserted on the guide sleeve 12, and the cutting knife 5 can move along the guide sleeve 12. Fig. 9 and Fig.10 As shown, when the connecting tube 2 is in the first state, that is, one end of the connecting tube 2 is against the injection hole 4, the cutter 5 makes way for the connecting tube 2 and does not interfere with the connecting tube 2; when the connecting tube 2 is in the second state, that is, the connecting tube 2 is away from the injection hole 4, the cutter 5 moves toward the water outlet 24 along the guide sleeve 12, and the blade 22 on the cutter 5 can penetrate into the root of the water outlet 24 until the lower end edge of the injection hole 4, that is, Figure 8 The cutter 5 shown cuts the root of the nozzle 24 on the plastic part 23. When the rotating sleeve 11 rotates, the cutter 5 can be driven to rotate. Since the axis lines of the rotating sleeve 11, the connecting pipe 2 and the injection hole 4 are on the same straight line, the rotation of the rotating sleeve 11 causes the cutter 5 to rotate around the axis line of the injection hole 4 and perform rotary cutting on the root of the nozzle 24. Since the blade 22 penetrates into the diameter of the root of the nozzle 24, the cutter 5 can cut along the contact surface between the nozzle 24 and the plastic part 23, thereby completely removing the nozzle 24 and ensuring that the nozzle 24 of the plastic part 23 is flat.

[0042] Embodiment 2:

[0043] On the basis of the first embodiment, the present invention is to realize the rotation of the cutting knife 5, as shown in FIG. Figure 6 As shown, the present invention has a fixed sleeve with a gear ring 19 on the rotating sleeve 11, and a driving gear 20 meshing with the gear ring 19 is rotatably installed on the frame 1, so that when the driving gear 20 rotates, the gear ring 19 can be rotated, and the driving gear 20 can be installed on the output shaft of the motor. Since the cutter 5 can be slidably inserted on the guide sleeve 12, and the guide sleeve 12 is fixed on the rotating sleeve 11, the cutter 5 can be driven to rotate when the driving gear 20 rotates, so as to perform rotary cutting on the water outlet 24.

[0044] In order to drive the cutter 5 to move on the guide sleeve 12, the present invention slides and installs the movable sleeve 13 in the rotating sleeve 11 through the form of spline matching, so that the movable sleeve 13 can rotate with the rotating sleeve 11 and move along the axial direction of the rotating sleeve 11. Figure 7 As shown, a guide block 14 is fixed on the movable sleeve 13, and an inclined guide groove 15 is provided on the guide block 14. Fig. 9As shown, a shaft body 16 is fixed on the cutting knife 5 , and the shaft body 16 is located in the guide groove 15 . When the guide block 14 moves, the inclined guide groove 15 will drive the shaft body 16 to move, thereby causing the cutting knife 5 to move along the guide sleeve 12 .

[0045] Taking into account that the rotating sleeve 11 needs to rotate, and the movable sleeve 13 will rotate with the rotating sleeve 11, in order to facilitate driving the movable sleeve 13 to move in the rotating sleeve 11, the present invention has a second cylinder 17 fixed on the frame 1, and a limit ring 18 is rotatably installed on the movable sleeve 13, and the movable end of the second cylinder 17 is fixedly connected to the limit ring 18. In this way, when the second cylinder 17 is working, the second cylinder 17 drives the limit ring 18 to move, thereby causing the movable sleeve 13 to move on the rotating sleeve 11.

[0046] Through the above arrangement, when the second cylinder 17 is working, the cutter 5 can be driven to move toward the water outlet 24 and partially inserted into the water outlet 24. When the driving gear 20 rotates, the cutter 5 rotates with the rotating sleeve 11 to perform rotary cutting on the water outlet 24, thereby removing the water outlet 24.

[0047] Embodiment three:

[0048] Based on the first and second embodiments, the number of the cutting knives 5 can be one or more.

[0049] When there is only one cutter 5, the length of the blade 22 of the cutter 5 should be greater than the radius of the water outlet 24, so that when the blade 22 is against the diameter of the lower edge 6 of the injection hole 4, the blade 22 can cut the axis of the water outlet 24. In this way, when the cutter 5 rotates around the axis of the injection hole 4, the root of the water outlet 24 can be completely cut off.

[0050] When there are multiple cutters 5, for example, two cutters 5 are centrally symmetrically distributed around the axis of the injection hole 4. Figure 5 and Figure 8 As shown, the two cutters 5 move toward the root of the nozzle 24 at the same time. Since there are two cutters 5, as long as the blades 22 of the two cutters 5 cooperate to cover the diameter range of the nozzle 24, it can be ensured that the root of the nozzle 24 can be completely cut off when the cutters 5 rotate. At this time, the length of the blade 22 of the cutter 5 can be equal to the radius of the nozzle 24, that is, the radius of the lower edge 6 of the injection hole 4.

[0051] In order to collect the cut nozzle 24 and control the drop of the nozzle 24, an air outlet pipe 21 is fixed on the frame 1, and the air outlet pipe 21 is connected to an external air supply device, which can be a gas cylinder. The air outlet pipe 21 blows air between the cutters 5. When the cutter 5 cuts off the nozzle 24, the nozzle 24 is blown away by the air outlet pipe 21, which does not affect the next injection molding.

[0052] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A plastic nozzle cutting mechanism, characterized in that: include: Rack(1); A connecting pipe (2), the connecting pipe (2) having the freedom to reciprocate on the frame (1), and the two ends of the connecting pipe (2) being respectively used to connect the injection hole (4) of the injection mold (3) and the discharge port of the plastic extruder; One or more cutting knives (5), the cutting knives (5) being arranged on the frame (1) and used for cutting the water outlet (24); the cutting knives (5) being capable of rotating around the axis of the liquid injection hole (4); The connecting tube (2) and the injection hole (4) have two matching states. In the first state, the connecting tube (2) abuts against the injection mold (3), so that the inner cavity of the connecting tube (2) is connected to the injection hole (4); in the second state, the connecting tube (2) is away from the injection hole (4); when the connecting tube (2) is in the second state, the cutting knife (5) can move toward the injection hole (4), so that the blade (22) of the cutting knife (5) is located on the diameter of the lower edge (6) of the injection hole (4); The injection hole (4) is trumpet-shaped, and the diameter of the lower edge (6) of the injection hole (4) is smaller than the diameter of the upper edge (7) of the injection hole (4); A sliding sleeve (8) is fixed on the frame (1), the connecting pipe (2) is movably plugged into the sliding sleeve (8), and one end of the connecting pipe (2) close to the injection hole (4) is provided with a conical surface (9) that matches the injection hole (4); A rotating sleeve (11) is rotatably mounted on the frame (1), the rotating sleeve (11) being coaxial with the connecting pipe (2), and a number of guide sleeves (12) corresponding to the number of cutting knives (5) being fixed to one end of the rotating sleeve (11) close to the injection mold (3), and the cutting knives (5) are slidably mounted on the corresponding guide sleeves (12); A movable sleeve (13) is slidably mounted in the rotating sleeve (11), the rotating sleeve (11) and the movable sleeve (13) are spline-matched, a guide block (14) is fixed on the movable sleeve (13), a guide groove (15) is formed on the guide block (14), and a shaft (16) slidably matched with the guide groove (15) is fixed on the cutting knife (5); when the movable sleeve (13) moves on the rotating sleeve (11), the cutting knife (5) moves on the guide sleeve (12); A second cylinder (17) is fixed on the frame (1), a limit ring (18) is fixed on the movable end of the second cylinder (17), and the limit ring (18) is rotatably mounted on the movable sleeve (13); when the second cylinder (17) is working, the second cylinder (17) drives the movable sleeve (13) to move on the rotating sleeve (11).

2. A plastic nozzle cutting mechanism as claimed in claim 1, characterized in that: A first cylinder (10) is fixed on the frame (1), the first cylinder (10) is parallel to the connecting pipe (2), and a movable end of the first cylinder (10) is fixedly connected to the connecting pipe (2).

3. A plastic nozzle cutting mechanism as claimed in claim 1, characterized in that: A gear ring (19) is fixed on the rotating sleeve (11), and a driving gear (20) meshing with the gear ring (19) is provided on the frame (1).

4. A plastic nozzle cutting mechanism as claimed in claim 1, characterized in that: An air outlet pipe (21) is provided on the frame (1), the air outlet pipe (21) is connected to an external air supply device, and the air outlet pipe (21) blows air toward between the cutting knives (5).

5. A plastic nozzle cutting mechanism as claimed in claim 1, characterized in that: The length of the blade (22) of the cutting knife (5) is greater than or equal to the radius of the lower edge (6) of the injection hole (4).

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