Fixed mold front-pulling type automatic screw releasing structure

Abstract

The utility model relates to the technical field of injection mold processing, in particular to a fixed mold front pull type automatic thread release structure, which comprises a threaded core for forming threads of an injection product and a driving source, a gear transmission structure is arranged between the threaded core and the driving source, the threaded core comprises an inner core, and a threaded sleeve is arranged outside the inner core in a sliding manner. A reset piece is arranged between the threaded sleeve and the inner core. When the mold is closed, the external movable mold can promote the thread bushing to move downwards along the inner core and stretch the reset piece, and the fixed mold front pulling type automatic thread releasing structure has the beneficial effect that the thread releasing efficiency can be improved.

Description

Technical Field

[0001] This utility model relates to the field of injection mold processing technology, specifically to a fixed mold front-pull automatic unscrew structure. Background Technology

[0002] Injection molds are fixtures used for the rapid prototyping of plastic products. An injection mold consists of two parts: a moving mold and a fixed mold. The moving mold is installed on the moving platen of the injection molding machine, and the fixed mold is installed on the fixed platen of the injection molding machine. During injection molding, the moving mold and the fixed mold close to form a gating system and a cavity. When the mold is opened, the moving mold and the fixed mold separate to remove the plastic product.

[0003] Currently, many precision plastic parts require threaded structures for use in precision components. However, existing demolding mechanisms generally employ two methods: one is forced demolding, where the plastic part and its structure allow, but this method easily damages the threads; the other typically uses a hydraulic or pneumatic cylinder to move a rack, which in turn rotates the threaded core to eject it into the injection molded part. Because the rack is moved by a hydraulic or pneumatic cylinder, the rack plate usually needs to be relatively large, and the stroke of the cylinder also occupies a significant amount of mold space, increasing unnecessary volume. Furthermore, after demolding, the injection molded part still needs to be manually removed or ejector pins need to be added to push it out, resulting in low demolding efficiency. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a fixed mold front-pull automatic unscrewing structure that can improve the unscrewing efficiency, in order to address the shortcomings of the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a fixed mold front-pull automatic unscrew structure, including a threaded core for forming the thread of an injection molded product and a drive source, wherein a gear transmission structure is provided between the threaded core and the drive source, characterized in that: the threaded core includes an inner core, a threaded sleeve is slidably provided outside the inner core, and a reset member is provided between the threaded sleeve and the inner core; when the mold is closed, the external moving mold can cause the threaded sleeve to move downward along the inner core and stretch the reset member.

[0006] The above technical solution, compared with the existing technology which has a slow unscrewing efficiency and is unstable during unscrewing, easily causing thread seizing, improves the unscrewing efficiency by setting up a threaded sleeve and a reset component. During mold closing, the moving mold approaches the fixed mold, causing the moving mold to drive the threaded sleeve to move downward along the inner core and stretch the reset component. After injection molding is completed, when the moving mold is pulled open to a certain designed position, the drive source is activated to drive the threaded sleeve to rotate through the gear transmission structure, thereby achieving unscrewing. At the same time, since the force of the moving mold being pulled open and stretching the reset component disappears, the reset component drives the threaded sleeve to move upward along the inner core to reset and bring out the injection molded part. This achieves synchronous rotation and forward pulling, and the separation of the threaded core from the product thread is smoother, avoiding damage or deformation caused by forced ejection, and improving the unscrewing efficiency.

[0007] A further feature of this invention is that the upper part of the threaded sleeve is provided with a thread forming section, and the threaded sleeve is provided with a sliding section below the thread forming section. The bottom of the threaded sleeve is provided with a lower mounting seat, and the inner core is provided with an upper mounting seat. One end of the reset member abuts against the upper mounting seat, and the other end abuts against the lower mounting seat.

[0008] The above technical solution ensures the formation of the product thread by setting the thread forming section. At the same time, the upper and lower mounting seats facilitate the installation of the reset component, realizing the deformation and reset of the reset component when the threaded sleeve moves relative to the inner core.

[0009] A further feature of this invention is that the reset element is a reset spring, and the reset spring is arranged around the outer wall of the inner core.

[0010] The above technical solution is adopted: by setting the reset component as a reset spring, when the threaded sleeve moves downward during mold closing, the reset spring is stretched and the elastic potential energy is stored. After injection molding is completed and the mold is opened, the force acting on the threaded sleeve disappears and the elastic potential energy is released. In conjunction with the drive source, the gear transmission structure drives the threaded sleeve to rotate, the reset spring resets and drives the threaded sleeve to reset, so that the rotation and forward pull can be synchronized, and the separation of the threaded core from the product thread is smoother.

[0011] A further feature of this invention is that at least one bearing is provided on the outer wall of the threaded sleeve; a sealing element is also provided between the inner core and the threaded sleeve, and the sealing element is located above the upper mounting base.

[0012] The above technical solution is adopted to improve the rotation effect of the threaded sleeve in the fixed mold by setting the bearing, making the rotation smoother. At the same time, the sealing effect between the inner mold and the threaded sleeve is improved by setting the seal.

[0013] A further feature of this invention is that the gear transmission structure includes a main gear that is linked to the output end of the drive source. A first auxiliary gear is meshed on the side of the main gear near the threaded core, and a second auxiliary gear is meshed on the other side of the first auxiliary gear. The side of the second auxiliary gear away from the first auxiliary gear is linked to a threaded sleeve. The outer wall of the threaded sleeve is provided with teeth that mesh with the first auxiliary gear.

[0014] The above technical solution is adopted: by starting the drive source to drive the main gear to rotate, the rotation of the first auxiliary gear and the second auxiliary gear can be linked in sequence. At the same time, due to the setting of the teeth on the threaded sleeve, the second auxiliary gear can drive the threaded sleeve to rotate, thereby achieving the effect of rotating and unscrewing. Compared with the rack and pinion driven by the cylinder or oil cylinder, this structure greatly reduces the space occupied in the fixed mold.

[0015] A further feature of this invention is that a return block is provided on the side of the threaded sleeve away from the drive source, and an inclined positioning block is provided at one end of the return block near the threaded sleeve. The threaded sleeve is provided with a corresponding positioning groove, and an installation cavity is provided at the other end of the return block. An elastic element is provided in the installation cavity, and one end of the elastic element is connected to the bottom of the installation cavity, and the other end is connected to the inner wall of the fixed mold.

[0016] The above technical solution addresses this issue: because the drive source rotates the threaded sleeve via a gear transmission structure, the position where the threaded sleeve stops varies when it stops rotating, resulting in inconsistent threads in each injection molding process. By using a return block and a positioning groove, the drive source is activated before mold closing, causing the threaded sleeve to reverse and engage with the inclined positioning block on the return block, ensuring consistent threads in each injection molding process. Furthermore, the installation cavity and elastic element ensure that when the drive source rotates the threaded sleeve to remove the threads, it can compress the return block, causing it to retract past the positioning groove, thus preventing the return block from interfering with the normal unscrewing function.

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0019] Figure 2 This is a schematic diagram of the threaded core structure of this utility model.

[0020] Figure 3 This is a cross-sectional view of the threaded core of this utility model.

[0021] Figure 4 This is an exploded view of the threaded core and return block of this utility model.

[0022] Labeling: 1. Threaded core, 11. Inner core, 111. Upper mounting base, 12. Threaded sleeve, 121. Threaded forming section, 122. Sliding section, 123. Lower mounting base, 124. Bearing, 125. Tooth, 126. Positioning groove, 13. Return spring, 14. Seal, 2. Drive source, 3. Gear transmission structure, 31. Main gear, 32. First auxiliary gear, 33. Second auxiliary gear, 4. Return block, 41. Inclined positioning block, 42. Mounting cavity, 43. Elastic element. Detailed Implementation

[0023] In the accompanying drawings of this specific embodiment and the disclosed embodiments, only the structures involved in the disclosed embodiments are involved. Other structures can be referred to with ordinary design. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of this utility model, they are protected by patent law.

[0024] Example 1:

[0025] like Figure 1-3 The illustrated fixed-mold front-pull automatic unscrew structure includes a threaded core 1 for forming the thread of an injection-molded product and a drive source 2. Preferably, the drive source 2 is an electric motor. A gear transmission structure 3 is provided between the threaded core 1 and the drive source 2. The threaded core 1 includes an inner core 11, and a threaded sleeve 12 is slidably provided on the outer side of the inner core 11. A reset member is provided between the threaded sleeve 12 and the inner core 11. When the mold is closed, the external moving mold can cause the threaded sleeve 12 to move downward along the inner core 11 and stretch the reset member. The reset member is a reset spring 13, and the reset spring 13 is arranged around the outer wall of the inner core 11.

[0026] like Figure 3 The threaded sleeve 12 shown has a thread forming section 121 on the upper part, and a sliding section 122 is provided below the thread forming section 121. The threaded sleeve 12 has a lower mounting seat 123 at the bottom, and an upper mounting seat 111 is provided on the inner core 11. One end of the reset member abuts against the upper mounting seat 111, and the other end abuts against the lower mounting seat 123.

[0027] like Figure 1-3 At least one bearing 124 is provided on the outer wall of the threaded sleeve 12 shown; a seal 14 is also provided between the inner core 11 and the threaded sleeve 12, and the seal 14 is located above the upper mounting base 111.

[0028] like Figure 1 The gear transmission structure 3 shown includes a main gear 31 that is linked to the output end of the drive source 2. A first auxiliary gear 32 is meshed on the side of the main gear 31 near the threaded core 1. A second auxiliary gear 33 is meshed on the other side of the first auxiliary gear 32. The side of the second auxiliary gear 33 away from the first auxiliary gear 32 is linked to the threaded sleeve 12. The outer wall of the threaded sleeve 12 is provided with teeth 125 that mesh with the first auxiliary gear 32.

[0029] Compared with the slow unscrewing efficiency of existing technologies, this invention, during mold closing, moves the moving mold close to the fixed mold, causing the moving mold to drive the threaded sleeve 12 downward along the inner core 11 and stretch the return spring 13. After injection molding is completed, when the moving mold is pulled open to a certain designed position, the drive source 2 is activated to drive the threaded sleeve 12 to rotate through the gear transmission structure 3, thereby achieving unscrewing. At the same time, since the force of stretching the return spring 13 disappears due to the moving mold being pulled open, the return spring 13 drives the threaded sleeve 12 to move upward along the inner core 11 to reset and bring out the injection molded part. This achieves synchronous rotation and forward pulling, and the separation of the threaded core 1 from the product thread is smoother, avoiding damage or deformation caused by forced ejection, and improving the unscrewing efficiency.

[0030] Example 2:

[0031] like Figure 4 As shown, the structure of Embodiment 2 is basically the same as that of Embodiment 1. The difference is that a return block 4 is provided on the side of the threaded sleeve 12 away from the drive source 2, and the return block 4 is slidably disposed in the fixed mold. An inclined positioning block 41 is provided at one end of the return block 4 near the threaded sleeve 12. A corresponding positioning groove 126 is provided on the threaded sleeve 12. An installation cavity 42 is opened at the other end of the return block 4. An elastic element 43 is provided in the installation cavity 42. One end of the elastic element 43 is connected to the bottom of the installation cavity 42, and the other end is connected to the inner wall of the fixed mold.

[0032] In the process of using this utility model, since the drive source 2 drives the threaded sleeve 12 to rotate through the gear transmission structure 3, the position where the threaded sleeve 12 stops when it stops rotating is different, resulting in inconsistent threads for each injection. By setting the return block 4 and the positioning groove 126, the threaded sleeve 12 is reversed by starting the drive source 2 before mold closing, causing the inclined positioning block 41 on the return block 4 to lock with the positioning groove 126, thereby ensuring that the threads of the products injected each time are consistent. At the same time, by setting the mounting cavity 42 and the elastic element 43, when the drive source 2 rotates the threaded sleeve 12 to unscrew, it can squeeze the return block 4 to retract and pass over the positioning groove 126, ensuring that the return block 4 does not affect the normal unscrewing function.

Claims

1. A fixed mold front-pull type automatic thread releasing structure, comprising a thread core for forming a thread of an injection molded product and a driving source, wherein a gear transmission structure is provided between the thread core and the driving source, characterized in that: The threaded core includes an inner core, and a threaded sleeve is slidably provided on the outer side of the inner core. A reset member is provided between the threaded sleeve and the inner core. When the mold is closed, the external moving mold can cause the threaded sleeve to move downward along the inner core and stretch the reset member.

2. A positive mold front pull automatic ejection structure according to claim 1, characterized in that: The threaded sleeve has a threaded forming section at its upper part, and a sliding section is provided below the threaded forming section. The bottom of the threaded sleeve has a lower mounting seat, and the inner core has an upper mounting seat. One end of the reset member abuts against the upper mounting seat, and the other end abuts against the lower mounting seat.

3. A positive mold front pull automatic screw release structure according to claim 2, characterized in that: The reset component is a reset spring, and the reset spring is arranged around the outer wall of the inner core.

4. A positive mold front pull automatic screw release structure according to claim 3, characterized in that: At least one bearing is provided on the outer wall of the threaded sleeve; a seal is also provided between the inner core and the threaded sleeve, and the seal is located above the upper mounting base.

5. A fixed-mold front-pull automatic unscrew structure according to any one of claims 1-4, characterized in that: The gear transmission structure includes a main gear that is linked to the output end of the drive source. A first auxiliary gear is meshed on the side of the main gear near the threaded core. A second auxiliary gear is meshed on the other side of the first auxiliary gear. The side of the second auxiliary gear away from the first auxiliary gear is linked to a threaded sleeve. The outer wall of the threaded sleeve is provided with teeth that mesh with the first auxiliary gear.

6. A positive draft automatic ejection structure according to any one of claims 1 to 4, wherein: The threaded sleeve is provided with a return block on the side away from the drive source. The end of the return block near the threaded sleeve is provided with a sloping positioning block. The threaded sleeve is provided with a corresponding positioning groove. The other end of the return block is provided with an installation cavity. An elastic element is provided in the installation cavity. One end of the elastic element is connected to the bottom of the installation cavity, and the other end is connected to the inner wall of the fixed mold.

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