Internal cutting die for PVC (polyvinyl chloride) drainage twisted tooth type die

Abstract

The utility model relates to the technical field of injection molds, in particular to an internal cutting mold for a PVC (polyvinyl chloride) drainage twisted tooth type mold. The mold comprises a base, and an ejector pin bottom plate, an ejector pin panel, a movable mold, a fixed mold and a hot runner plate which are mounted on the base from bottom to top, a rotating shaft vertically extending upwards to the center of the bottom of the movable mold is installed on the base, threads are arranged on the outer surface of the rotating shaft, and the ejector pin panel and the ejector pin bottom plate are screwed on the rotating shaft; the base is further provided with a first driving mechanism and a transmission assembly connected with the output end of the first driving mechanism. A cutting tool is mounted in the hot runner plate; one end, deviating from the runner sprue, of the cutting tool is connected with the output end of the second driving mechanism; and the driving assembly comprises an air valve collision block mounted on the ejector pin panel and a control valve mounted between the base and the movable mold, and the control valve is connected with a second driving mechanism. The utility model effectively solves the technical problem that the appearance quality of the pipeline is poor due to the fact that marks are easy to leave at the twisted tooth interface of the pipeline when the mould is demoulded in the prior art.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection mold technical field especially relates to a PVC drainage twisted tooth class in -mold cutting mold. BACKGROUND

[0002] PVC pipe, full name is polyvinyl chloride pipe, is with polyvinyl chloride resin as main raw material, add stabilizer, lubricant etc. After cooperation use hot pressure extrusion molding plastic pipe. The traditional PVC pipe's connection mode often exists poor tightness, installation complex etc. Problem, and the PVC pipe with twisted tooth interface is with its connection close, the advantage of installation simple is favored by the market, and the side sprue of the existing pipe card class twisted tooth pipe fitting is cut by artificial, not only low efficiency, and the labor intensity is big, and the manual cutting sprue section is uneven.

[0003] For this, the patent document with the authorization announcement number CN209888042U discloses a kind of PVC electrician sleeve-pipe joint mould, the mould includes bottom plate, first driving gear, first driven gear, second driving gear, second driven gear, from bevel gear, oil motor, reverse tooth shaft, threaded core, bevel gear shaft, main shaft, key, from shaft, main bevel gear and flow channel, bottom plate is sequentially provided with upper die insert and lower die insert from bottom to top, wherein one end of bevel gear shaft is fixedly connected with oil motor, the other end is fixedly connected main bevel gear, main bevel gear is rotatably connected with from bevel gear by tooth engagement, from bevel gear is fixed on the circumference of main shaft by key, and one end of its main shaft is fixed on bottom plate, and first driving gear is drivenly connected on main shaft by key, first driving gear is rotatably connected with first driven gear by tooth engagement, and first driven gear is fixed on from shaft by key, from shaft one end is fixed on bottom plate, the other end is connected with reverse tooth shaft, and the end of reverse tooth shaft away from from shaft is inserted into the flow channel on the upper surface of lower die insert;Second driving gear is fixedly connected with from shaft by key, and second driving gear is rotatably connected with second driven gear by tooth engagement, one end of threaded core is inserted and connected with second driven gear, and the other end is embedded in lower die insert and connected with upper die insert.

[0004] It can be seen that the mould is separated from lower die insert by the rotation of the screw thread of threaded core front section to separate product and screw thread when using, although it can simplify production process, but it is easy to leave obvious trace or protrusion at pipe twisted tooth interface, affect the appearance quality of product, and for the case that sprue and product are connected closely, direct separation is also easy to cause the material of twisted tooth interface to be damaged, in turn affect the strength and tightness of product connection. UTILITY MODEL CONTENTS

[0005] The utility model provides a PVC drainage twisted tooth class mould in mould cutting mould, to solve the technical problem of leaving mark in pipe twisted tooth interface when mould stripping in prior art, resulting in poor pipe appearance quality.

[0006] To solve the above problem, the PVC drainage twisted tooth class mould in mould cutting mould provided by the utility model adopts the following technical scheme:

[0007] A PVC drainage twisted tooth class mould in mould cutting mould, comprising:

[0008] The top surface of the base is sequentially provided with a ejector pin bottom plate, an ejector pin face plate, a movable mould, a fixed mould and a hot runner plate from bottom to top, and the fixed mould has a cavity;

[0009] Further comprising:

[0010] A threaded core is installed on the movable mould and corresponds to the cavity, and a bearing assembly is arranged between the threaded core and the movable mould;

[0011] A rotating shaft is installed on the base and vertically extends to the center of the bottom of the movable mould, the outer surface of the rotating shaft is provided with threads, the ejector pin face plate and the ejector pin bottom plate are screwed on the rotating shaft, and a transmission gear is arranged between the threaded core and the rotating shaft;

[0012] A first driving mechanism is installed on the base, and the output end of the first driving mechanism is downwardly arranged, and a transmission assembly for connecting the rotating shaft and the output end is installed in the base;

[0013] A cutting tool is horizontally installed in the hot runner plate and used for cutting off a runner gate, and one end of the cutting tool, which is away from the runner gate, is connected with the output end of a second driving mechanism;

[0014] A driving assembly comprises a gas valve striker installed on the ejector pin face plate and the ejector pin bottom plate and a control valve installed between the base and the movable mould, the control valve is connected with the second driving mechanism, and after the gas valve striker moves upwardly to touch the control valve, the second driving mechanism is controlled to work by the control valve.

[0015] The PVC drainage twisted tooth class mould in mould cutting mould has the following beneficial effects:

[0016] 1. The first driving mechanism is installed on the base, the rotating shaft vertically extends to the center of the bottom of the movable mould, the first driving mechanism is in transmission connection with the rotating shaft, the ejector pin bottom plate and the ejector pin face plate are screwed on the rotating shaft, the rotating shaft is driven to rotate by the first driving mechanism, the threaded core arranged on the fixed mould is pushed to move upwardly, the product is separated from the runner, and the mould stripping of the product is realized;

[0017] 2. By horizontally installing the cutting tool in the hot runner plate, connecting the end of the cutting tool away from the runner gate with the output end of the second driving mechanism, setting the air valve block on the ejector face plate, setting the control valve between the base and the fixed mold, and connecting the control valve with the second driving mechanism, the air valve block can touch the control valve when the ejector face plate moves to contact the air valve block, so as to control the output end of the second driving mechanism to extend, thereby driving the cutting tool to cut off the runner gate, and the appearance quality of the product at the runner gate can be effectively ensured.

[0018] Through the above setting, the utility model utilizes the characteristics of product ejection, controls the output end of the second driving cylinder to extend through the rotating power, drives the cutting tool to cut off the runner gate, ensures the appearance quality of the product at the runner gate, realizes the full automatic production of the product, reduces the manual intervention, significantly improves the production efficiency, and effectively solves the technical problems that the existing technology is prone to leaving marks at the pipe ejection interface during mold ejection, resulting in poor pipe appearance quality.

[0019] Further, the shaft sleeve is rotatably installed on the rotating shaft, and the outer periphery of the shaft sleeve is fixedly connected with the ejector face plate and the ejector base plate.

[0020] Further, the transmission assembly comprises a first gear installed on the output end of the first driving mechanism and a second gear installed on the bottom of the rotating shaft, and the first gear and the second gear are drivingly connected through a third gear.

[0021] Further, the cutting tool comprises a cutter rod, one end of the cutter rod is connected with the output end of the second driving mechanism, and a cutting knife is installed at the other end of the cutter rod.

[0022] Further, the first driving mechanism is an oil motor.

[0023] Further, the second driving mechanism is installed on the outside of the fixed mold.

[0024] Further, the second driving mechanism is a cylinder.

[0025] Further, the control valve is a one-way roller lever type mechanical valve.

[0026] Further, the bearing assembly comprises first bearings arranged on the upper end and the lower end of the movable mold, and a second bearing arranged on the fixed mold and located between the two first bearings.

[0027] Further, the first bearing is a deep groove ball bearing, and the second bearing is a one-way thrust ball bearing. BRIEF DESCRIPTION OF DRAWINGS

[0028] The above and other objects, features and advantages of the present embodiments will become more apparent from the following detailed description read in conjunction with the accompanying drawings. In the drawings, several embodiments of the present disclosure are illustrated by way of example and not limitation. Like reference numerals are used to refer to corresponding or like parts throughout the several views of the drawings, and:

[0029] Figure 1 The internal structure of the PVC drainage twisted tooth class mold cutting mold provided by the utility model Figure 1 ;

[0030] Figure 2 The internal structure of the PVC drainage twisted tooth class mold cutting mold provided by the utility model Figure 2 ;

[0031] Figure 3 The structure of the PVC drainage twisted tooth class mold cutting mold provided by the utility model.

[0032] Explanation of reference signs:

[0033] 1, base; 2, ejector pin bottom plate; 3, ejector pin faceplate; 4, moving die; 5, stationary die; 6, hot runner plate; 7, threaded core; 8, rotating shaft; 9, oil motor; 10, cutting tool; 11, air cylinder; 12, air valve impact block; 13, one-way roller lever type mechanical valve; 14, shaft sleeve; 15, first gear; 16, second gear; 17, third gear; 18, deep groove ball bearing; 19, one-way thrust ball bearing; 20, product; 21, transmission gear; 22, square iron. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Those skilled in the art should know that the embodiments described below are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0035] It should be noted that the main concept of the PVC drainage threaded die provided by this utility model is as follows: by setting a first driving mechanism on the base plate, and connecting the output end of the first driving mechanism to a rotating shaft 8 extending vertically to the center of the bottom of the moving mold 4, the ejector base plate 2 and ejector panel 3 are screwed onto the rotating shaft 8, and the cutting tool 10 is horizontally installed in the hot runner plate 6. The outer end of the cutting tool 10 is connected to the output end of the second driving mechanism. At the same time, an air valve stop block 12 is set on the ejector panel 3, and a control valve is set between the base 1 and the fixed mold 5. The control valve is connected to the second driving mechanism, so that the rotating shaft 8 can be driven to rotate by the first driving mechanism to push the threaded core 7 set on the fixed mold 5 to move upward, so that the product 20 is demolded. At the same time, the ejector panel 3 and ejector base plate 2 move upward with the rotation of the rotating shaft 8, and the air valve stop block 12 also moves upward to touch the control valve. The control valve then controls the output end of the second driving mechanism to extend, so as to drive the cutting tool 10 to cut off the runner gate. Thus, the appearance quality of the product 20 at the runner gate can be guaranteed during the demolding process.

[0036] After introducing the basic principles of this utility model, various non-limiting embodiments of this utility model are described in detail below. Any quantity of elements in the accompanying drawings is for illustrative purposes only and not for limitation, and any naming is for distinction only and has no limiting meaning.

[0037] The principles and spirit of this utility model will be explained in detail below with reference to several representative embodiments.

[0038] Example 1 of the PVC drainage threaded die inner cutting mold provided by this utility model:

[0039] like Figures 1 to 3 As shown, the PVC drainage coiled die includes a base 1, a rotating shaft 8, a first drive mechanism, a cutting tool 10, a second drive mechanism, and a drive assembly. The base 1 is equipped with an ejector base plate 2, an ejector panel 3, a moving mold 4, a fixed mold 5, and a hot runner plate 6, which are installed from bottom to top. The fixed mold 5 has a cavity, and the moving mold 4 is equipped with a threaded core 7 corresponding to the cavity. The ejector panel 3 is provided with ejector pins that extend upward to the threaded core 7.

[0040] Regarding the rotating shaft 8: The rotating shaft 8 is mounted on the base 1 and extends vertically upward to the center of the bottom of the moving mold 4. The outer surface of the rotating shaft 8 has threads to screw on the bushing 14. The outer periphery of the bushing 14 is fixedly connected to the ejector plate 3 and the ejector base plate 2 to achieve the purpose of screwing the ejector plate 3 and the ejector base plate 2 onto the rotating shaft 8. The rotating shaft 8 and the threaded core 7 are connected by a transmission gear 21 mounted on the threaded core 7.

[0041] Regarding the first drive mechanism. The first drive mechanism is an oil motor 9, which is installed on the base 1 and the output end thereof is arranged downward, the output end of the oil motor 9 is in transmission connection with the rotating shaft 8 through a transmission assembly, wherein the transmission assembly comprises a first gear 15 installed on the output end of the oil motor 9 and a second gear 16 installed on the bottom of the rotating shaft 8, the first gear 15 and the second gear 16 are in transmission connection through a third gear 17.

[0042] Regarding the cutting tool 10. The cutting tool 10 is horizontally installed in the hot runner plate 6, which comprises a cutter rod, the right end of the cutter rod is connected with the output end of the second drive mechanism, and the other end is provided with a cutting knife, the second drive mechanism is used for driving the cutter rod to move, so as to drive the cutting knife to move, thereby cutting off the runner gate.

[0043] Wherein, the second drive mechanism is a pneumatic cylinder 11, which is installed on the outside of the fixed mold 5.

[0044] Regarding the drive assembly. The drive assembly comprises a valve block 12 installed on the side of the ejector plate 3 and the ejector base plate 2 and a control valve installed between the base 1 and the movable mold 4, the control valve is connected with the pneumatic cylinder 11, so as to control the second drive mechanism to work after the valve block 12 moves upward to touch the control valve.

[0045] Specifically, the control valve is a one-way roller lever type mechanical valve 13, a square iron 22 is installed between the base 1 and the movable mold 4, and the one-way roller lever type mechanical valve 13 is installed on the square iron 22.

[0046] In addition, a bearing assembly is further arranged between the screw core 7 and the movable mold 4, the bearing assembly comprises two first bearings arranged on the upper end and the lower end of the movable mold 4 and a second bearing arranged on the fixed mold 5 and located between the two first bearings, wherein the first bearing is a deep groove ball bearing 18, and the second bearing is a one-way thrust ball bearing 19.

[0047] The working principle of the PVC drainage thread class mold cutting mold provided by the utility model is as follows: when the product 20 is demolded, the oil motor 9 is started to drive the second gear 16, the third gear 17, the first gear 15 and the rotating shaft 8 in sequence, in the process of rotating the rotating shaft 8, the shaft sleeve 14 rotatably installed on the rotating shaft 8 moves upward to drive the ejector plate 3 and the ejector base plate 2 to move upward, the valve block 12 also moves upward along with the upward movement of the ejector plate 3, when the valve block 12 contacts the one-way roller lever type mechanical valve 13, the one-way roller lever type mechanical valve 13 is triggered, the pneumatic cylinder 11 starts to ventilate, after the pneumatic cylinder 11 ventilates, the cutting tool 10 moves forward to cut off the runner gate, at the same time, the ejector pin moves upward along with the ejector plate 3 and the ejector base plate 2 in the process of rotating the rotating shaft 8, synchronously drives the screw core 7 to move upward, so that the product 20 is demolded.

[0048] The embodiment 2 of the PVC drainage twisted tooth type mold cutting mold provided by the utility model:

[0049] The difference between the embodiment 2 and the embodiment 1 is mainly that:

[0050] In the embodiment 1, the first driving mechanism is an oil motor.

[0051] In the embodiment, the first driving mechanism is an electric motor.

[0052] The embodiment 3 of the PVC drainage twisted tooth type mold cutting mold provided by the utility model:

[0053] The difference between the embodiment 3 and the embodiment 1 is mainly that:

[0054] In the embodiment 1, the first gear and the second gear are connected through the third gear.

[0055] In the embodiment, the first gear and the second gear are connected.

[0056] According to the above description of the present specification, those skilled in the art can also understand that the terms used, such as "upper", "lower", "front", "rear", "left", "right", "width", "horizontal", "top", "bottom", "inner", "outer", and the like, are terms indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings of the present specification, and are only for the purpose of facilitating the description of the scheme of the utility model and simplifying the description, and do not explicitly or implicitly indicate that the devices or elements involved must have the specified orientation, be constructed and operated in the specified orientation, therefore the above orientation or positional relationship terms cannot be understood or interpreted as a limitation on the scheme of the utility model.

[0057] In addition, in the description of the present specification, the meaning of "a plurality of" is at least two, such as two, three or more, etc., unless otherwise explicitly and specifically limited.

Claims

1. A PVC drainage threaded die for internal cutting, comprising: The base has, from bottom to top, an ejector base plate, an ejector panel, a moving mold, a fixed mold, and a hot runner plate installed on its top surface. The fixed mold has a cavity. Its characteristic is that it further includes: A threaded core is mounted on the moving mold and corresponds to the cavity, and a bearing assembly is provided between the threaded core and the moving mold; A rotating shaft is mounted on the base and extends vertically upward to the center of the bottom of the moving mold. The outer surface of the rotating shaft has threads. The ejector plate and the ejector base plate are screwed onto the rotating shaft. A transmission gear is provided between the threaded core and the rotating shaft. A first drive mechanism is mounted on the base, with its output end facing downwards. A transmission assembly for connecting the rotating shaft and the output end is installed inside the base. A cutting tool is horizontally mounted inside the hot runner plate to cut off the runner gate. The end of the cutting tool away from the runner gate is connected to the output end of the second drive mechanism. The drive assembly includes a valve stop block mounted on the ejector plate and the ejector base plate, and a control valve mounted between the base and the moving mold. The control valve is connected to the second drive mechanism so that the second drive mechanism is controlled by the control valve to operate after the valve stop block moves upward to touch the control valve.

2. The PVC drainage threaded die in-mold cutting mold according to claim 1, characterized in that, A bushing is screwed onto the rotating shaft, and the outer circumference of the bushing is fixedly connected to the ejector plate and the ejector base plate.

3. The PVC drainage threaded die in-mold cutting mold according to claim 1 or 2, characterized in that, The transmission assembly includes a first gear installed at the output end of the first drive mechanism and a second gear installed at the bottom of the rotating shaft, with the first gear and the second gear connected by a third gear.

4. The PVC drainage threaded die in-mold cutting mold according to claim 1 or 2, characterized in that, The cutting tool includes a shank, one end of which is connected to the output end of the second drive mechanism, and the other end is equipped with a cutting blade.

5. The PVC drainage threaded die in-mold cutting mold according to claim 1 or 2, characterized in that, The first drive mechanism is a hydraulic motor.

6. The PVC drainage threaded die in-mold cutting mold according to claim 1 or 2, characterized in that, The second drive mechanism is installed on the outside of the fixed mold.

7. The PVC drainage threaded die in-mold cutting mold according to claim 6, characterized in that, The second drive mechanism is a cylinder.

8. The PVC drainage threaded die in-mold cutting mold according to claim 1 or 2, characterized in that, The control valve is a one-way roller lever type mechanical valve.

9. The PVC drainage threaded die in-mold cutting mold according to claim 1 or 2, characterized in that, The bearing assembly includes first bearings disposed at the upper and lower ends of the moving mold, and a second bearing disposed on the fixed mold and located between the two first bearings.

10. The PVC drainage threaded die in-mold cutting mold according to claim 9, characterized in that, The first bearing is a deep groove ball bearing, and the second bearing is a one-way thrust ball bearing.

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