Bevel gear forming ejection mechanism

Abstract

The utility model relates to a bevel gear forming ejection mechanism, which relates to the technical field of mould production equipment, and comprises a bottom plate, a mould plate, a mould core, a supporting plate, a mould cavity and an ejection plate in sequence from bottom to top, spring columns are arranged at corners of the bottom plate, an inner groove is arranged at the center of the bottom plate, a circular groove is arranged on the inner groove, and the mould core is arranged in the circular groove. An ejector pin penetrates through the circular groove, and a limiting plate is embedded in the inner groove; an arc-shaped groove matched with the mold core is formed in the mold plate. The mold core is placed on the arc-shaped groove of the mold plate, the clamping blocks are arranged on the periphery of the mold core, the position of the mold core in the forming process is effectively limited and fixed, the stability of the mold core is ensured, meanwhile, the limiting assembly is installed on the mold plate, the limiting assembly and the clamping blocks work cooperatively, the mold core is always kept stable in the ejection process, and the mold core is prevented from being damaged. Product deformation or damage caused by uneven stress is avoided, and therefore the forming quality of the product is remarkably improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of mould production equipment, especially a helical gear forming ejection mechanism. BACKGROUND

[0002] Engineering plastics are often used to manufacture plastic gears, which have the characteristics of low noise, light dynamic load, etc., and are applied to small-power mechanical transmission and large-power mechanical transmission, etc., and the transmission of plastic helical gears has the characteristics of uniform contact, small meshing impact and stable transmission, etc., and is adopted in transmission occasions. The tooth surface of the helical gear is a spiral involute curved surface, the direction of the curved surface is not parallel to the demolding direction of the injection mold, and is inclined by a spiral angle. When the plastic helical gear is injection molded and demolded, the push-out mechanism is required to push out in the demolding direction, and at the same time, the tooth-shaped cavity or the plastic gear itself rotates in the direction of the tooth shape inclination, so as to achieve the purpose of smooth demolding. A rotating ejection mechanism is usually provided on the mold structure.

[0003] The Chinese patent document with the authorization publication number CN219405194U discloses a helical gear ejection mold, relating to the technical field of molds, comprising a first mold frame and a second mold frame, and a core is arranged inside the first mold frame, wherein a second mold frame is arranged on the top of the first mold frame and matched therewith. The fixed guide rod and the two groups of limiting rods are inserted into the injection cavity, wherein the fixed guide rod forms the shaft hole of the helical gear, and the two groups of limiting rods form the keyway of the helical gear. After the helical gear is injection molded, the push plate mechanism of the external injection machine drives the demolding plate to push upward, at this time, the lifting rotating cylinder moves upward relative to the fixed guide rod. Since the guide sliding block slides in the arc-shaped guide groove, the lifting rotating cylinder rotates during the upward movement relative to the fixed guide rod. The lifting rotating cylinder can drive the injection-molded helical gear to rotate and demold, the overall demolding process is relatively convenient, and no external power mechanism is required, effectively reducing the overall energy consumption problem and improving the work efficiency.

[0004] However, in the prior art, due to the tooth shape inclination of the helical gear, the product is not uniformly stressed during ejection, which easily leads to product deformation or damage, and during the rotating ejection process, the contact surface between the product and the end surface of the ejector pin is large, having a strong friction force, and the product in turn drives the ejector pin to rotate synchronously, which increases the difficulty of ejection. UTILITY MODEL CONTENTS

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art, and provides a helical gear forming ejection mechanism for solving the problems in the background art.

[0006] In order to solve the above problems, the utility model provides a helical gear forming ejection mechanism, from down to up includes bottom plate, template, mould core, cavity and top plate in proper order, the corner of bottom plate is installed spring post, the centre of bottom plate is equipped with inner recess, the inner recess is equipped with round groove, the inner recess is embedded with limit stop plate, the template is equipped with arc slot which is matched with mould core, the four end parts of template near arc slot all are provided with clamping piece, the one end of template near clamping piece is hinged with limit component, the inner bottom wall of cavity is provided with inner cavity which is matched with mould core, the top plate is equipped with injection channel, injection channel and inner cavity are linked together.

[0007] The helical gear forming ejection mechanism also has the following technical features.

[0008] Further, the limit component is composed of a hinge, a support arm and a top block, the hinge is installed on the side of the template, the middle end of the hinge is hinged with the support arm, the end of the support arm away from the hinge is fixedly connected with the top block, and the top block abuts against the rear end of the clamping piece.

[0009] Further, the corner of the bottom of the template is equipped with a jack hole matched with the spring post.

[0010] Further, the center of the bottom of the template is equipped with a hole matched with the ejector pin, and the ejector pin penetrates the hole and extends to the inside of the mould core.

[0011] Further, the top end of the template is equipped with a positioning hole, the bottom of the cavity is fixedly connected with a plug rod, and the cavity is inserted into the positioning hole of the template through the plug rod.

[0012] Further, the inner surface of the inner cavity is provided with an inner lining plate.

[0013] Further, the inside of the mould core is equipped with an injection inner cavity, the injection inner cavity is used for forming a helical gear, and the inside of the injection inner cavity is provided with a key groove matched with the ejector pin.

[0014] Further, the bottom of the bottom plate is placed with a demoulding plate.

[0015] The utility model has the following beneficial effects: 1, first, the moulding core is placed on the arc groove of the template, and the position of the moulding core in the forming process is effectively limited and fixed through the setting of the clamping block around the moulding core, the stability is ensured, meanwhile, the limiting component is installed on the template, the limiting component and the clamping block work cooperatively, the moulding core keeps stable during the ejection process, the product deformation or damage caused by uneven stress is avoided, thereby the forming quality of the product is improved obviously, 2, the spring post on the bottom plate provides necessary elastic support for the ejection process, ensures that the ejection action is stable, effectively reduces the deformation of the product in the ejection process caused by uneven stress, in addition, the limiting plate is additionally installed on the bottom plate, plays the limiting role to the ejector pin, ensures that the ejector pin can smoothly and accurately eject the mould, further avoids the deformation of the mould in the ejection process caused by uneven stress, guarantees the stability and reliability of the whole ejection process. BRIEF DESCRIPTION OF DRAWINGS

[0016] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the utility model.

[0017] Fig. 1 It is the structure schematic view of the bottom plate in the utility model;

[0018] Fig. 2 It is the structure schematic view of the limiting component in the utility model;

[0019] Fig. 3 It is the bottom structure schematic view of the template in the utility model;

[0020] Fig. 4 It is the bottom structure schematic view of the cavity in the utility model.

[0021] Mark explanation: 1 - bottom plate, 111 - demoulding plate, 2 - template, 21 - arc groove, 201 - jack, 202 - hole, 211 - positioning hole, 3 - moulding core, 31 - injection inner cavity, 5 - cavity, 51 - inner cavity, 511 - inserting rod, 510 - inner lining plate, 6 - top plate, 61 - material injection channel, 7 - spring post, 8 - inner recess, 81 - round groove, 9 - ejector pin, 10 - limiting plate, 11 - clamping block, 12 - limiting component, 121 - hinge, 122 - support arm, 133 - top block. DETAILED DESCRIPTION

[0022] Hereinafter, the utility model will be described in detail with reference to the drawings and in combination with the embodiments. It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0023] As Figs. 1 to 4 shown in one embodiment of the bevel gear forming ejection mechanism of the utility model, the bevel gear forming ejection mechanism of the embodiment sequentially comprises a bottom plate 1, a mold plate 2, a mold core 3, a cavity 5 and a top plate 6 from bottom to top, the bottom of the bottom plate 1 is placed with a demolding plate 111, the corner of the bottom plate 1 is installed with a spring column 7, the corner of the bottom of the mold plate 2 is provided with a jack 201 matched with the spring column 7, the center of the bottom plate 1 is provided with an inner groove 8, the inner groove 8 is provided with a circular groove 81, the circular groove 81 is penetrated with a ejector pin 9, the center of the bottom of the mold plate 2 is provided with a hole 202 matched with the ejector pin 9, the ejector pin 9 penetrates the hole 202 and extends to the inside of the mold core 3, the inner groove 8 is embedded with a limiting plate 10; the mold plate 2 is provided with an arc-shaped groove 21 matched with the mold core 3, the four ends of the mold plate 2 close to the arc-shaped groove 21 are provided with clamping blocks 11, the end of the mold plate 2 close to the clamping blocks 11 is hinged with a limiting assembly 12, the inside of the mold core 3 is provided with an injection inner cavity 31, the injection inner cavity 31 is used for forming a bevel gear, the inside of the injection inner cavity 31 is provided with a key groove matched with the ejector pin 9; the inner bottom wall of the cavity 5 is provided with an inner cavity 51 matched with the mold core 3, the top plate 6 is provided with an injection channel 61, the injection channel 61 and the inner cavity 51 are communicated, in the utility model, the bottom plate 1 is the supporting structure of the whole device, the bottom of the bottom plate 1 is placed with the demolding plate 111, which is used for providing support for the ejector pin 9 in the demolding process, the spring column 7 is installed at the corner of the bottom plate 1, which provides elastic support when ejecting, ensuring that the ejection process is stable; the inner groove 8 is provided at the center of the bottom plate 1, which is used for installing the limiting plate 10 and the ejector pin 9, the circular groove 81 provided on the inner groove 8 is used for penetrating the ejector pin 9, ensuring that the ejector pin 9 can smoothly pass through the bottom plate 1 and extend to the inside of the mold core 3; the mold plate 2 cooperates with the bottom plate 1 to form the main structure of the mold, providing installation and positioning functions, the jack 201 provided at the corner of the bottom of the mold plate 2 is matched with the spring column 7 on the bottom plate 1, ensuring accurate installation of the mold plate 2 and the bottom plate 1, the hole 202 provided at the center of the bottom of the mold plate 2 is used for the ejector pin 9 to penetrate and extend to the inside of the mold core 3, the arc-shaped groove 21 is provided on the mold plate 2 and matched with the mold core 3, ensuring that the mold core 3 can be accurately installed, the clamping blocks are provided at the four ends of the mold plate 2 close to the arc-shaped groove 21, which are used for cooperating with the limiting assembly 12, ensuring the stability of the mold core 3 in the ejection process, the injection inner cavity 31 provided in the inside of the mold core 3 is used for forming a bevel gear, the key groove provided in the inside of the injection inner cavity 31 is matched with the ejector pin 9, ensuring that the ejector pin 9 can smoothly eject the product, the inner cavity 51 provided on the inner bottom wall of the cavity 5 is matched with the mold core 3, ensuring the complete formation of the product, the injection channel 61 provided on the top plate 6 is communicated with the inner cavity 51 of the cavity 5, ensuring that the plastic can be smoothly injected into the cavity.

[0024] In one embodiment of the present application, preferably, the limiting assembly 12 is composed of a hinge 121, a supporting arm 122 and a top block 133, the hinge 121 is installed on the side of the mold plate 2, the middle end of the hinge 121 is hinged with the supporting arm 122, the end of the supporting arm 122 away from the hinge 121 is fixedly connected with the top block 133, and the top block 133 abuts against the rear end of the clamping block 11. In the utility model, the hinge 121 is installed on the side of the mold plate 2, which ensures that it can rotate freely at the edge of the mold plate 2. The middle end of the hinge 121 is hinged with the supporting arm 122, forming a rotatable connecting point, so that the supporting arm 122 can move up and down under the driving of the hinge 121. The supporting arm 122 can move up and down under the driving of the hinge 121, which ensures that the top block 133 can accurately abut against the rear end of the clamping block 11, thereby limiting the movement of the mold core 3. When the ejecting mechanism is started, the ejector pin 9 starts to eject the mold core 3 upward. Since the top block 133 abuts against the rear end of the clamping block 11, the limiting assembly 12 cooperates with the clamping block 11 to ensure that the mold core 3 remains stable during the ejecting process, preventing the mold core 3 from deforming due to uneven stress.

[0025] In one embodiment of the present application, preferably, the top end of the mold plate 2 is provided with a positioning hole 211, and the bottom of the cavity 5 is fixedly connected with a plug rod 511. The cavity 5 is inserted into the positioning hole 211 of the mold plate 2 through the plug rod 511. In the utility model, the cavity 5 is inserted into the positioning hole 211 of the mold plate 2 through the plug rod 511, which ensures the accurate installation of the cavity 5 on the mold plate 2, reduces assembly errors, and improves the overall precision and stability of the mold.

[0026] In one embodiment of the present application, preferably, the inner surface of the inner cavity 51 is provided with an inner lining plate 510. In the utility model, the inner lining plate 510 improves the surface quality and durability of the inner cavity 51 of the cavity 5, reduces friction, and ensures smooth demolding of the product during the ejecting process.

[0027] The utility model discloses a use time: from down to top includes bottom plate 1, template 2, mould core 3, mould cavity 5 and top plate 6 in proper order, bottom plate 1 bottom places demoulding plate 111, and the spring post 7 is installed in the corner, and the recess 8 is equipped in the center, and the recess 8 is on the through pin 9 and is embedded in the limiting plate 10, and the insertion hole 201 of template 2 bottom is equipped with spring post 7 adaptation, and the hole 202 is equipped in the center and is used for the through pin 9, and the arc groove 21 and the clamping stopper 11 are set up, and the side surface hinged limiting assembly 12 is composed of hinge 121, support arm 122 and top block 133, and the top block 133 is in abutment with the rear end of clamping stopper 11, and the stability is ensured when mould core 3 is ejected, and the injection cavity 31 is equipped in mould core 3, and the key groove is adapted through pin 9, and the inner chamber 51 is equipped in the bottom wall of mould cavity 5, and the inner chamber 51 is communicated with the material injection channel 61 of top plate 6, and the positioning hole 211 is equipped at the top of template 2, and the insertion rod 511 is inserted into the positioning hole 211 of the bottom of mould cavity 5, and the inner lining plate 510 is equipped on the inner surface of inner chamber 51, improve surface quality and durability, reduce friction, and ensure that the product is smoothly demoulded.

[0028] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0029] Finally, it should be noted that: the above examples are only used to illustrate the technical scheme of the utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it still can modify the technical scheme recorded in the foregoing each embodiment, or make equivalent substitution to part of the technical features; and these modifications or substitutions do not make the essence of the corresponding technical scheme deviate from the spirit and scope of the technical scheme of each embodiment of the utility model.

Claims

1. A helical gear forming ejection mechanism characterized by, From bottom to top in turn includes the bottom plate (1), template (2), die (3), cavity (5) and top plate (6), the edge of the bottom plate (1) is installed with spring column (7), the center of the bottom plate (1) is provided with inner groove (8), the inner groove (8) is provided with round groove (81), the round groove (81) is penetrated with thimble (9), the inner groove (8) is embedded with limit board (10); The template (2) is provided with arc slot (21) matched with die (3), the four end parts of the template (2) close to arc slot (21) are provided with clamping block (11), the end of the template (2) close to clamping block (11) is hinged with limit assembly (12); The inner bottom wall of the cavity (5) is provided with inner cavity (51) matched with die (3), the top plate (6) is provided with injection channel (61), the injection channel (61) and inner cavity (51) are communicated.

2. The helical gear forming ejection mechanism of claim 1, wherein, The limit assembly (12) is composed of hinge (121), support arm (122) and top block (133), the hinge (121) is installed on the side of the template (2), the middle end of the hinge (121) is hinged with support arm (122), the end of the support arm (122) away from the hinge (121) is fixedly connected with top block (133), the top block (133) abuts against the rear end of clamping block (11).

3. The helical gear forming ejection mechanism of claim 1 wherein, The edge of the bottom of the template (2) is provided with insertion hole (201) matched with spring column (7).

4. The helical gear forming ejection mechanism of claim 1 wherein, The center of the bottom of the template (2) is provided with hole (202) matched with thimble (9), the thimble (9) penetrates hole (202) and extends to the inside of die (3).

5. The helical gear forming ejection mechanism of claim 1 wherein, The top end of the template (2) is provided with positioning hole (211), the bottom of the cavity (5) is fixedly connected with insertion rod (511), the cavity (5) is inserted into the positioning hole (211) of the template (2) through insertion rod (511).

6. The helical gear forming ejection mechanism of claim 1 wherein, The inner surface of the inner cavity (51) is provided with inner lining plate (510).

7. The helical gear forming ejection mechanism of claim 1 wherein, The inside of the die (3) is provided with injection inner cavity (31), the injection inner cavity (31) is used for forming helical gear, the inside of the injection inner cavity (31) is provided with key groove matched with thimble (9).

8. The helical gear forming ejection mechanism of claim 1 wherein, The bottom of the bottom plate (1) is placed with stripping plate (111).

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