Mould structure for ejecting and rotating to remove internal threads

Abstract

The utility model discloses a mold structure for ejecting and rotating to remove internal threads, which comprises a fixed seat, a push plate is arranged on the fixed seat, the push plate is movably connected with the fixed seat in a limiting manner, and a rear mold core is arranged in the push plate; an ejector rod, a driving gear and a threaded core are arranged on the fixed seat, the driving gear and the threaded core are rotatably connected with the fixed seat, one end of the threaded core can extend into the rear mold core, a transmission gear sleeves the threaded core, and the transmission gear is in meshed connection with the driving gear; a transmission sleeve is arranged on the driving gear, a first internal thread is arranged in the transmission sleeve, a first external thread is arranged on the outer side wall of the ejector rod, one end of the ejector rod penetrates through the transmission sleeve, and the first external thread is in meshed connection with the first internal thread. According to the utility model, the ejection rod is driven to stretch out and draw back, so that the internal thread on a plastic product is demoulded, the processing efficiency is improved, the overall size of the mould is reduced, and the mould is suitable for a small injection molding machine or under the condition of small mould containing space and small mould hanging space.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to a mold structure for ejecting and rotating internal threads. Background Art

[0002] At present, there are several common ways to remove threads from molds for injection molding plastic products with threads: 1. Manual thread removal, in which the inserts are removed manually after demoulding to achieve the demoulding effect. This production method is very inefficient.

[0003] 2. Automatic thread stripping method, that is, using a hydraulic cylinder to push the rack to drive the gear and the thread core to rotate and strip the core, completing the internal thread stripping action of the plastic product. This method requires the installation of a hydraulic cylinder on the mold, which can only be applied to some larger injection molding machines, and requires a relatively large mold space and hanging mold space to be realized; it is not applicable to small injection molding machines or situations where the mold space is small and the hanging mold space is small. Utility Model Content

[0004] In order to solve some or all of the problems existing in the above-mentioned prior art, the utility model provides a mold structure for ejecting and rotating to remove internal threads, including a fixed seat, a push plate is provided on the fixed seat, the push plate is movably limitedly connected to the fixed seat, and a rear model core is provided in the push plate; a push rod, a driving gear and a threaded core are provided on the fixed seat, the push rod and the fixed seat are telescopically slidably matched, the driving gear and the threaded core are respectively rotatably connected to the fixed seat, one end of the threaded core can be extended into the rear model core, a transmission gear is sleeved on the threaded core, and the transmission gear is meshed with the driving gear; the push rod is used for an external power mechanism, the driving gear is provided with a transmission sleeve, the transmission sleeve is provided with a first internal thread, and the outer wall of the push rod has a first external thread, one end of the push rod passes through the transmission sleeve, and the first external thread is meshed with the first internal thread.

[0005] As a further improvement of the utility model, a linkage rod is provided on the fixed seat, the linkage rod is rotatably connected to the fixed seat, a linkage gear is sleeved on the linkage rod, the linkage gear is meshingly connected to the driving gear, a linkage sleeve is provided on the push plate, one end of the linkage rod can pass through the linkage sleeve and is slidably connected to the linkage sleeve.

[0006] As a further improvement of the present invention, a second internal thread is provided in the linkage sleeve, a second external thread is provided on the outer side wall of the linkage rod, and the second external thread is meshedly connected with the second internal thread.

[0007] As a further improvement of the present invention, there are two linkage rods, and the two linkage rods are symmetrically distributed on both sides of the top rod.

[0008] As a further improvement of the present invention, a limiting rod is provided on the fixing seat, one end of the limiting rod away from the fixing seat can abut against the push plate, and the limiting rod and the push plate are slidably and limitably connected.

[0009] As a further improvement of the utility model, a plurality of mold closing guide pins are provided on the fixing seat, and the mold closing guide pins respectively pass through the push plate and are slidably matched with the push plate.

[0010] As a further improvement of the utility model, the upper end surface of the push plate is provided with a plurality of positioning grooves.

[0011] As a further improvement of the present invention, there are four positioning grooves, and the four positioning grooves are respectively arranged at the center positions of the four side edges of the push plate.

[0012] As a further improvement of the utility model, the number of the rear model cores and the threaded cores are four respectively, and two are arranged in one-to-one correspondence, and the four rear model cores are distributed in a rectangular shape on the push plate.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The utility model realizes demoulding of the internal thread on the plastic product by driving the extension and retraction of the ejector rod, without manual operation and external oil cylinder, which not only improves the processing efficiency but also reduces the production cost of the mold; reduces the overall volume of the mold, so that it can be used in a small injection molding machine or in the case of small mold space and small hanging mold space.

[0015] During processing, the mold is installed on the injection molding machine, and one end of the ejector pin is connected and fixed to the ejector rod of the injection molding machine. After the mold is opened, the product is formed in the rear mold core, and the internal thread on the plastic product is screwed and fixed to the threaded core; the ejector pin is pulled or pushed by the ejector rod of the injection molding machine to telescope in the fixed seat, and the first external thread on the ejector pin cooperates with the first internal thread on the transmission sleeve. The telescopic movement of the ejector pin drives the transmission sleeve to rotate, driving the driving gear to rotate, and the driving gear drives the transmission gear and the threaded core to rotate synchronously. The threaded core rotates to eject the internal thread on the plastic product, completing the process of removing the internal thread of the plastic product. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of an embodiment of the utility model;

[0018] Figure 2 This is a schematic diagram of the top view of the structure of an embodiment of the utility model;

[0019] Figure 3 yes Figure 2 Schematic diagram of the AA section structure;

[0020] Figure 4 yes Figure 2 Schematic diagram of the structure of the middle BB section;

[0021] Figure 5 yes Figure 2 Schematic diagram of the CC cross-section structure;

[0022] Figure 6 It is a schematic diagram of the matching structure of the ejector rod, the driving gear, the threaded core and the linkage rod in the embodiment of the utility model;

[0023] Figure 7 It is a schematic diagram of the structure of the driving gear in the embodiment of the utility model. DETAILED DESCRIPTION

[0024] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by technicians in the technical field of the present invention; the terms used in the specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present invention or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order.

[0025] Reference to "embodiments" in the present invention means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it mutually exclusive, independent, or alternative to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present invention may be combined with other embodiments.

[0026] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0027] like Figure 1-7 As shown, a mold structure for ejecting and rotating to remove internal threads includes a fixed seat 1. When working, the fixed seat 1 is installed on an injection molding machine. A push plate 2 is arranged on the fixed seat 1. The push plate 2 is movably limitedly connected to the fixed seat 1. Four rear model cores 3 are distributed in a rectangular shape on the push plate 2, so that the mold structure can mold four products at one time, thereby improving the processing efficiency of the mold. A push rod 4, a driving gear 5 and a threaded core 6 are arranged on the fixed seat 1. The push rod 4 and the fixed seat 1 can be telescopically slidably matched; when working, one end of the push rod 4 is connected to the ejector rod of the injection molding machine, the driving gear 5 and the threaded core 6 are rotatably connected to the fixed seat 1 respectively, the threaded core 6 and the rear model core 3 are arranged one by one, and one end of the threaded core 6 can be respectively extended into the corresponding rear model core 3, and a transmission gear 7 is sleeved on the threaded core 6, and the transmission gear 7 is meshed with the driving gear 5; so that the rotation of the driving gear 5 can drive the threaded core 6 to rotate synchronously through the transmission gear 7.

[0028] One end of the ejector rod 4 extends out of the fixed seat 1 and is used to connect to the ejector rod of the injection molding machine. A transmission sleeve 8 is fixedly installed on the driving gear 5, and the transmission sleeve 8 is concentrically arranged with the driving gear 5. A first internal thread 81 is arranged in the transmission sleeve 8, and a first external thread 41 is arranged on the outer wall of the ejector rod 4. One end of the ejector rod 4 passes through the transmission sleeve 8, and the first external thread 41 is meshed and connected with the first internal thread 81.

[0029] During processing, the mold is installed on the injection molding machine, and one end of the ejector pin 4 is connected and fixed to the ejector rod of the injection molding machine. During injection molding, the plastic product is injection molded on the rear model core 3; after the mold is opened, the product is molded in the rear model core 3, and the internal thread on the plastic product is screwed and fixed to the threaded core 6; the ejector pin 4 is pulled or pushed by the ejector rod of the injection molding machine to telescope in the fixed seat 1, and the first external thread 41 on the ejector pin 4 cooperates with the first internal thread 81 on the transmission sleeve 8, so that the telescopic movement of the ejector pin 4 can drive the transmission sleeve 8 to rotate, drive the drive gear 5 to rotate, and the drive gear 5 drives the transmission gear 7 and the threaded core 6 to rotate synchronously, and the threaded core 6 rotates to eject the internal thread on the plastic product, completing the process of removing the internal thread of the plastic product.

[0030] The mold structure for ejecting and rotating to remove the internal thread realizes demoulding of the internal thread on the plastic product by driving the extension and retraction of the ejector rod 4, without manual operation or external oil cylinder, which not only improves the processing efficiency but also reduces the production cost of the mold; it reduces the overall volume of the mold, making it suitable for use in small injection molding machines or in situations where the mold space is small and the hanging mold space is small.

[0031] Two linkage rods 9 are installed on the fixed seat 1, and the two linkage rods 9 are symmetrically distributed on both sides of the top rod 4. The linkage rod 9 is limitedly connected to the fixed seat 1 and can rotate in the fixed seat 1. The linkage gear 10 is sleeved on the linkage rod 9, and the linkage gear 10 is respectively meshed and connected with the driving gear 5. The push plate 2 is respectively installed with linkage sleeves 11 at the corresponding positions of the two linkage rods 9. The linkage rod 9 passes through the corresponding linkage sleeves 11 and is slidably connected with the linkage sleeves 11. In specific operation, when the top rod 4 drives the driving gear 5 to rotate, the driving gear 5 will drive the linkage rod 9 to rotate through the linkage gear 10, and the rotation of the linkage rod 9 will push the linkage sleeve 11 to move up and down, and the linkage sleeve 11 drives the push plate 2 and the rear model core 3 to move up and down on the fixed seat 1. Therefore, when the driving gear 5 drives the threaded core 6 to remove the internal thread of the plastic product, when the threaded core 6 rotates, the rear model core 3 will move away from the fixed seat 1, and the rear model core 3 will resist the plastic product to prevent the plastic product from rotating synchronously with the threaded core 6, thereby ensuring that the internal thread of the plastic product can be smoothly detached from the threaded core 6.

[0032] In this embodiment, the linkage sleeve 11 is provided with a second internal thread 12, and the outer wall of the linkage rod 9 is provided with a second external thread 91, and the second external thread 91 is meshed and connected with the second internal thread 12. Through the cooperation between the second internal thread 12 and the second external thread 91, the linkage rod 9 can drive the linkage sleeve 11 and the push plate 2 to move toward or away from the fixed seat 1 during the rotation process. In other embodiments, the linkage sleeve 11 and the linkage rod 9 can also adopt other types of structural methods, as long as it is ensured that the rotation of the linkage rod 9 can drive the linkage sleeve 11 to move up and down.

[0033] In order to limit the movement of the push plate 2, a plurality of limit rods 13 are installed on the fixed seat 1. The end of the limit rod 13 away from the fixed seat 1 can abut against the push plate 2, and the limit rods 13 are respectively connected to the push plate 2 in a slidable and limited manner. When the linkage rod 9 drives the linkage sleeve 11 to move up and down, the push plate 2 will slide on the limit rod 13; after the plastic product on the threaded core 6 completes the internal thread demoulding, the linkage sleeve 11 also drives the push plate 2 to move to abut against the limit rod 13, and the movement of the push plate 2 is limited by the limit rod 13, so as to prevent the threaded core 6 from falling out of the rear mold core 3, thereby improving the stability of the structure and transmission.

[0034] Four mold closing guide pins 14 are arranged on the fixed seat 1, and the mold closing guide pins 14 respectively pass through the push plate 2 and slide with the push plate 2. The mold closing guide pins 14 are used to close the front mold and the rear mold, so that the front mold can smoothly close the rear mold with the rear mold; at the same time, the mold closing guide pins 14 can also be used to limit and guide the movement direction of the push plate 2. When the ejector rod pushes the ejector rod 4 to move, the push plate 2 can be driven to slide on the mold closing guide pins 14. The mold closing guide pins 14 limit and guide the movement direction of the push plate 2, thereby improving the stability of the transmission and the accuracy of the processing.

[0035] In this embodiment, four mold guide pins 14 are respectively distributed at the four corner positions of the fixed base 1. In other embodiments, the mold guide pins 14 can be any other number or distribution method, and it is only necessary to ensure that the push plate 2 can slide on the mold guide pins 14.

[0036] In order to ensure that the front mold and the rear mold can be accurately molded during mold closing, four positioning grooves 15 are provided on the upper end surface of the push plate 2, and the four positioning grooves 15 are respectively provided at the center positions of the four sides of the push plate 2. Positioning pins are provided at positions corresponding to the positioning grooves 15 on the front mold. During mold closing, when the injection molding machine drives the front mold and the mold closing, the mold closing guide column 14 will be inserted into the corresponding guide hole in the front mold, and then the positioning pins on the front mold will be respectively inserted into the positioning grooves 15 until the front mold and the rear mold abut against each other to complete the mold closing. The cooperation of the positioning grooves 15 and the positioning pins can limit and guide the mold closing process, ensure smooth and accurate mold closing, and improve the stability of the processing. In other embodiments, the positioning grooves 15 can also be any other number and any distribution method.

[0037] Working principle:

[0038] Before processing, the front mold and the rear mold are fixedly installed on the injection molding machine respectively, and one end of the ejector rod 4 is fixedly connected to the ejector rod of the injection molding machine. During processing, the injection molding machine drives the front mold and the rear mold to close the mold, and the front mold and the rear mold can be closed smoothly and accurately through the cooperation of the mold closing guide column 14, the positioning groove 15 and the corresponding structure on the front mold. After the injection molding is completed, the injection molding machine drives the mold to open, so that the front mold and the rear mold are separated.

[0039] After the mold is opened, the product is formed in the rear mold core 3, and the internal thread on the plastic product is screwed and fixed with the thread core 6. Then, the injection molding machine drives the ejector rod to work, pulls or pushes the ejector rod 4 to telescopically move in the fixed seat 1, and the first external thread 41 on the ejector rod 4 cooperates with the first internal thread 81 on the transmission sleeve 8. The telescopic movement of the ejector rod 4 will drive the transmission sleeve 8 to rotate, drive the driving gear 5 to rotate, and the driving gear 5 drives the transmission gear 7 and the thread core 6 to rotate synchronously. The thread core 6 rotates to eject the internal thread on the plastic product, completing the internal thread removal process of the plastic product. In this process, the driving gear 5 will also drive the linkage gear 10 to drive the linkage rod 9 to rotate. The linkage rod 9 drives the linkage sleeve 11 and the push plate 2 to move away from the fixed seat 1 through the cooperation of the second external thread 91 and the second internal thread 12. The push plate 2 drives the rear mold core 3 to move synchronously, and the rear mold core 3 is pressed against the plastic product to prevent the plastic product from rotating synchronously with the thread core 6, thereby ensuring that the plastic product can successfully complete the internal thread demoulding operation.

[0040] When the internal thread of the plastic product is demoulded, the push rod 4 is driven to move in the opposite direction, thereby pulling the thread core 6 to rotate in the opposite direction and pulling the push plate 2 to move in the direction close to the fixed seat 1 until the push plate 2 abuts against the fixed seat 1 to complete the reset.

[0041] The above-mentioned specific implementation mode is a preferred implementation mode of the present utility model, and is not intended to limit the specific implementation scope of the present utility model. The scope of the present utility model includes but is not limited to the specific implementation mode. All equivalent changes made in accordance with the present utility model are within the protection scope of the present utility model.

Claims

1. A mold structure for ejecting and rotating internal threads, characterized in that: It comprises a fixed seat, a push plate is arranged on the fixed seat, the push plate is movably limitedly connected with the fixed seat, and a rear mold core is arranged in the push plate; The fixing seat is provided with a push rod, a driving gear and a threaded core, the push rod and the fixing seat are telescopically slidably matched, the driving gear and the threaded core are rotatably connected to the fixing seat respectively, one end of the threaded core can extend into the rear mold core, the threaded core is sleeved with a transmission gear, and the transmission gear is meshed and connected with the driving gear; The push rod is used for an external power mechanism, a transmission sleeve is provided on the driving gear, a first internal thread is provided in the transmission sleeve, a first external thread is provided on the outer wall of the push rod, one end of the push rod passes through the transmission sleeve, and the first external thread is meshed and connected with the first internal thread.

2. The mold structure for ejecting and rotating internal threads according to claim 1, characterized in that: A linkage rod is provided on the fixed seat, and the linkage rod is rotatably connected to the fixed seat. A linkage gear is sleeved on the linkage rod, and the linkage gear is meshed and connected with the driving gear. A linkage sleeve is provided on the push plate, and one end of the linkage rod can pass through the linkage sleeve and is slidably connected to the linkage sleeve.

3. The mold structure for ejecting and rotating internal threads according to claim 2, characterized in that: A second internal thread is provided in the linkage sleeve, and a second external thread is provided on the outer side wall of the linkage rod. The second external thread is meshedly connected with the second internal thread.

4. The mold structure for ejecting and rotating internal threads according to claim 2, characterized in that: There are two linkage rods, and the two linkage rods are symmetrically distributed on both sides of the top rod.

5. The mold structure for ejecting and rotating internal threads according to claim 2, characterized in that: The fixing seat is provided with a limiting rod, one end of the limiting rod away from the fixing seat can abut against the push plate, and the limiting rod and the push plate are slidably and limitably connected.

6. The mold structure for ejecting and rotating internal threads according to any one of claims 1 to 5, characterized in that: A plurality of mold clamping guide pins are arranged on the fixing seat, and the mold clamping guide pins respectively pass through the push plates and are slidably matched with the push plates.

7. The mold structure for ejecting and rotating internal threads according to claim 6, characterized in that: The upper end surface of the push plate is provided with a plurality of positioning grooves.

8. The mold structure for ejecting and rotating internal threads according to claim 7, characterized in that: There are four positioning grooves, and the four positioning grooves are respectively arranged at the center positions of the four side edges of the push plate.

9. The mold structure for ejecting and rotating internal threads according to any one of claims 1 to 5, characterized in that: There are four rear mold cores and four thread mold cores respectively, and two are arranged in one-to-one correspondence. The four rear mold cores are distributed on the push plate in a rectangular shape.

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