Fixed mold retreating type automatic screw releasing structure

Abstract

The utility model relates to the technical field of injection mold processing, in particular to a fixed mold retreating type automatic thread releasing structure which comprises a thread core used for forming threads of an injection product and a driving source, a gear transmission structure is arranged between the thread core and the driving source, and a power cylinder is arranged on the side, away from the gear transmission structure, of the thread core. The output end of the power cylinder is provided with an abutting block which can abut against the thread core to enable the thread core to move upwards and be fixed. The fixed mold retreating type automatic thread disengaging structure has the advantages of being suitable for forming deep threads and large-pitch products through injection molding and capable of achieving stable thread disengaging.

Description

Technical Field

[0001] This utility model relates to the field of injection mold processing technology, specifically to a fixed mold retraction type automatic screw 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 structures generally employ two methods: one is forced demolding, where the plastic part and structure allow, which can easily damage the threads; the other typically uses a hydraulic or pneumatic cylinder to move a rack and pinion, which in turn rotates the threaded core to eject it into the injection molded part. However, this method requires a large axial stroke when demolding deep threads, which may result in an excessively large mold size, making it unsuitable for injection molding deep threads and large pitch products. Therefore, a fixed-mold retraction automatic demolding structure needs to be designed to solve these problems. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a fixed mold retraction automatic unscrew structure that is suitable for injection molding of deep thread and large pitch products and can smoothly unscrew the screw, in order to overcome the shortcomings of the above-mentioned prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a fixed mold retraction type 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: a power cylinder is provided on the side of the threaded core away from the gear transmission structure, and an abutment block is provided on the output end of the power cylinder that can abut against the threaded core to move it upward and fix it.

[0006] The above technical solution is as follows: When the threaded core needs to be removed during use, the power cylinder is first activated to drive the abutment block to pull it away from the threaded core, thereby releasing the fixation of the threaded core and allowing the threaded core to have space to retract within the fixed mold. Then, the drive source is activated to drive the threaded core to rotate, thereby separating the threaded core from the product thread. At this time, the threaded core will move downwards, achieving thread removal. This structure can effectively avoid interference problems when demolding long threads. It should be noted that the bottom surface of the space within the fixed mold where the threaded core can retract is on the same surface as the bottom surface of the abutment block. Therefore, when injection molding is required, the power cylinder is activated again to push the abutment block closer to the threaded core until it abuts against the threaded core and causes the threaded core to move upwards, thus allowing injection molding to form the product thread.

[0007] A further feature of this invention is that the threaded core includes a threaded sleeve and an inner core installed inside the threaded sleeve. The abutment block has a sloping extrusion block at one end near the threaded sleeve. The lower end of the threaded sleeve has a first sloping surface corresponding to the sloping extrusion block. A slot is formed in the middle of the sloping extrusion block, and the lower end of the inner core can be located in the slot.

[0008] The above technical solution is adopted: by setting the inclined extrusion block on the abutment block and the first inclined surface on the threaded sleeve, the radial force generated at the contact point between the inclined surface on the inclined extrusion block and the first inclined surface can cause the threaded sleeve to move upward, so that the threaded sleeve can return to its original position and perform the next injection molding normally.

[0009] A further feature of this invention is that the power cylinder is a hydraulic cylinder, and a plug-in block is connected to the output end of the hydraulic cylinder. The plug-in block has an installation hole for the hydraulic oil pipe output end to be inserted, and the abutment block has an installation groove for the plug-in block to be inserted.

[0010] The above technical solution allows for precise control and smooth movement of the contact block by using a hydraulic cylinder. Furthermore, the insertion block and mounting groove facilitate assembly by the workers.

[0011] A further feature of this invention is that the upper outer wall of the threaded sleeve is provided with a threaded section, the middle part is provided with a toothed part that meshes with the gear transmission structure, and the outer end of the threaded sleeve is also provided with at least one bearing.

[0012] The above technical solution ensures the formation of product threads by setting the thread forming section. In addition, the tooth setting enables the gear transmission structure to rotate in conjunction with the threaded sleeve. At the same time, the bearing setting improves the rotation effect of the threaded sleeve in the fixed mold, making the rotation smoother.

[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 meshing on the side of the main gear near the threaded core, a second auxiliary gear meshing on the other side of the first auxiliary gear, and the second auxiliary gear meshing with the teeth on the side away from 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 to unscrew.

[0015] A further feature of this invention is that a return block is provided on one side of the threaded core, and an inclined positioning block is provided at one end of the return block near the threaded core. A corresponding positioning groove is provided on the outer wall of the threaded core. An installation cavity is opened at the other end of the return block, and an elastic element is provided inside 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.

[0016] The above technical solution addresses this issue: because the drive source rotates the threaded core via a gear transmission structure, the position where the threaded core stops rotating varies, 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 core to rotate in reverse. This causes the inclined positioning block on the return block to engage with the positioning groove, ensuring consistent threads in each injection molding product. Furthermore, the installation cavity and elastic element ensure that when the drive source rotates the threaded core to remove the threads, it can push the return block back past the positioning groove, guaranteeing that the return block does not interfere with the normal thread removal 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 an exploded view of the present invention.

[0020] Figure 3 This is a schematic diagram of the threaded core structure of this utility model.

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

[0022] Figure 5 This is a schematic diagram of the gear transmission structure of this utility model.

[0023] Labeling: 1. Threaded core, 11. Inner core, 12. Threaded sleeve, 121. First inclined surface, 122. Threaded forming section, 123. Tooth, 124. Bearing, 125. Positioning groove, 2. Drive source, 3. Gear transmission structure, 31. Main gear, 32. First auxiliary gear, 33. Second auxiliary gear, 4. Power cylinder, 41. Abutting block, 411. Inclined extrusion block, 411. Groove, 412. Mounting groove, 42. Insertion block, 5. Returning block, 51. Inclined positioning block, 52. Mounting cavity, 53. Elastic element. Detailed Implementation

[0024] 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.

[0025] Example 1:

[0026] like Figure 1-5 The illustrated fixed mold retraction automatic unscrew structure includes a threaded core 1 for molding the threads of injection molded products 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. A power cylinder 4 is provided on the side of the threaded core 1 away from the gear transmission structure 3. An abutment block 41 is provided on the output end of the power cylinder 4, which can abut against the threaded core 1 to move it upward and fix it.

[0027] like Figure 2-3 The threaded core 1 shown includes a threaded sleeve 12 and an inner core 11 installed inside the threaded sleeve 12. The abutment block 41 is provided with a sloping extrusion block 411 at one end near the threaded sleeve 12. The lower end of the threaded sleeve 12 is provided with a first sloping surface 121 corresponding to the sloping extrusion block 411. A slot 411a is opened in the middle of the sloping extrusion block 411, and the lower end of the inner core 11 can be located in the slot 411a.

[0028] like Figure 2 The power cylinder 4 shown is a hydraulic cylinder. A plug-in block 42 is connected to the output end of the hydraulic cylinder. Preferably, the plug-in block 42 is a T-shaped block. The plug-in block 42 is provided with a mounting hole for the hydraulic oil pipe output end to be plugged in. The abutment block 41 is provided with a mounting groove 412 for the plug-in block 42 to be plugged in. Preferably, the mounting groove 412 is a T-shaped groove, which makes the T-shaped block and the T-shaped groove more securely installed.

[0029] like Figure 3 The threaded sleeve 12 shown has a threaded section 122 on its upper outer wall, a toothed section 123 in the middle that meshes with the gear transmission structure 3, and at least one bearing 124 at its outer end; Figure 5The 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 meshes with the tooth portion 123.

[0030] In the process of using this utility model, when it is necessary to remove the thread, the power cylinder 4 is first started to drive the abutment block 41 to pull away the thread core 1, thereby releasing the fixation of the thread core 1 and making the thread core 1 have space to move backward in the fixed mold. Then, the drive source 2 is started to drive the gear transmission structure 3 to rotate the thread core 1, thereby separating the thread core 1 from the product thread. At this time, the thread core 1 will move downward relative to achieve the removal of the thread. This structure can effectively avoid the interference problem when demolding long threads. It should be noted that the bottom surface of the space in the fixed mold where the thread core 1 can move backward is on the same surface as the bottom surface of the abutment block 41. Therefore, when injection molding is required, the power cylinder 4 is started to push the abutment block 41 closer to the thread core 1. Through the setting of the inclined extrusion block 411 on the abutment block 41 and the first inclined surface 121 on the thread sleeve 12, the radial force generated at the contact point between the inclined surface on the inclined extrusion block 411 and the first inclined surface 121 can cause the thread sleeve 12 to move upward, causing the thread sleeve 12 to return to its original position and be injected normally.

[0031] Example 2:

[0032] 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 5 is provided on one side of the threaded core 1. A sloping positioning block 51 is provided at one end of the return block 5 near the threaded core 1. A corresponding positioning groove 125 is provided on the outer wall of the threaded core 1. An installation cavity 52 is opened at the other end of the return block 5. An elastic element 53 is provided in the installation cavity 52. ​​One end of the elastic element 53 is connected to the bottom of the installation cavity 52, and the other end is connected to the inner wall of the fixed mold.

[0033] In the process of using this utility model, since the drive source 2 drives the threaded core 1 to rotate through the gear transmission structure 3, the position where the threaded core 1 stops rotating is different when it stops rotating, resulting in inconsistent threads for each injection. By setting the return block 5 and the positioning groove 125, the drive source 2 is started before mold closing, causing the threaded core 1 to rotate in reverse, causing the inclined positioning block 51 on the return block 5 to lock with the positioning groove 125, thereby ensuring that the threads of the products injected each time are consistent. At the same time, by setting the mounting cavity 52 and the elastic element 53, when the drive source 2 rotates the threaded core 1 to unscrew, it can squeeze the return block 5 to retract past the positioning groove 125, ensuring that the return block 5 does not affect the normal unscrew function.

Claims

1. A fixed-mold retraction type automatic unscrew structure, comprising 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: A power cylinder is provided on the side of the threaded core away from the gear transmission structure, and an abutment block is provided on the output end of the power cylinder that can abut against the threaded core to move it upward and fix it.

2. An automatic screw release structure of the movable die backward retreat type according to claim 1, characterized in that: The threaded core includes a threaded sleeve and an inner core installed inside the threaded sleeve. The abutment block has a sloping extrusion block at one end near the threaded sleeve. The lower end of the threaded sleeve has a first sloping surface corresponding to the sloping extrusion block. A slot is opened in the middle of the sloping extrusion block, and the lower end of the inner core can be located in the slot.

3. The automatic screw release structure of claim 2, wherein: The power cylinder is a hydraulic cylinder, and a plug block is connected to the output end of the hydraulic cylinder. The plug block is provided with a mounting hole for the hydraulic oil pipe output end to be inserted, and the abutment block is provided with a mounting groove for the plug block to be inserted.

4. The automatic screw releasing structure of the stationary mold backward retreat type according to claim 3, wherein: The upper outer wall of the threaded sleeve is provided with a threaded section, and the middle part is provided with a toothed part that meshes with the gear transmission structure. The outer end of the threaded sleeve is also provided with at least one bearing.

5. An automatic screw release structure of the stationary die retreat type according to claim 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, 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 meshes with the teeth.

6. An automatic screw release structure of the movable die retreat type according to any one of claims 1 to 5, characterized in that: A return block is provided on one side of the threaded core. A beveled positioning block is provided at one end of the return block near the threaded core. A corresponding positioning groove is provided on the outer wall of the threaded core. An installation cavity is opened at the other end of the return block. 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.

Images