A demolding device for a straight-bend tube injection mold

Abstract

The application provides a demolding device for a straight-bent pipe injection mold, comprising a core assembly and a rotary driving mechanism; the core assembly comprises a communicating bent pipe part and a straight pipe part; the rotary driving mechanism comprises a connecting piece, a movable piece, a connecting rod and a fixed piece; one end of the connecting piece is connected with the straight pipe part, the other end of the connecting piece is connected with the movable piece, the other end of the movable piece is connected with the connecting rod, the fixed piece is provided with a track on the opposite surface of the movable piece, and the movable piece is slidably connected with the fixed piece along the track; when the connecting rod is pulled, the connecting rod drives the movable piece to rotate along the preset track of the fixed piece, and drives the straight pipe part and the bent pipe part to rotate synchronously, so that the bent pipe part and the straight pipe part are pulled out from the injection product. Through the linkage design of track sliding and rotation, the connecting rod can drive the movable piece, the straight pipe part and the bent pipe part to rotate synchronously and be pulled out, the operation is smooth, the pulling out is stable, and the injection product can be effectively prevented from being damaged.

Description

Technical Field

[0001] This application relates to the field of mold manufacturing technology, specifically to a demolding device for injection molds of straight and bent pipes. Background Technology

[0002] In existing injection molds, the core-pulling mechanism for straight and curved sections is based on simple linear motion or unidirectional drive, with direct connection between fixed and moving parts, and core-pulling is usually completed along a straight line or a single path.

[0003] The core-pulling mechanism is used for injection molding of plastic products with a composite structure of straight and curved tubes. It separates the straight and curved tube parts embedded in the product from the mold, thereby achieving demolding.

[0004] However, the following problems still exist during use: the core pulling is not stable and it is easy to get stuck; it can easily cause scratches on the product surface, internal deformation or even cracking. Utility Model Content

[0005] In view of the aforementioned problems, this application is made to provide a demolding device for a straight-bend pipe injection mold that overcomes or at least partially solves the aforementioned problems, comprising: A demolding device for a straight-bend injection mold includes a core assembly and a rotary drive mechanism; the core assembly includes a bend section and a straight section connected together. The rotary drive mechanism includes a connector, a movable component, a connecting rod, and a fixed component; one end of the connector is connected to the straight tube section, the other end of the connector is connected to the movable component, the other end of the movable component is connected to the connecting rod, and a track is provided on the opposite side of the fixed component and the movable component, and the movable component is slidably connected to the fixed component along the track; When the connecting rod is pulled, the connecting rod drives the movable part to rotate along the preset track of the fixed part, and drives the straight tube part and the bent tube part to rotate synchronously, so that the bent tube part and the straight tube part are pulled out from the injection molded product.

[0006] Preferably, the movable part is provided with a groove; When the connecting rod drives the movable part to rotate, the groove provides the connecting rod with room to move.

[0007] Preferably, the movable part is provided with a mounting hole, and the movable part is connected to the rotating shaft of the mold through the mounting hole; the center point of the arc surface of the fixed part is concentric with the center point of the rotating shaft.

[0008] Preferably, the straight pipe section is provided with a first positioning groove, and the connector is provided with a first positioning block that matches the first positioning groove; When the straight tube is pulled out of the injection molded product, the first positioning groove moves to a preset position and engages with the first positioning block.

[0009] Preferably, the movable component is provided with a protrusion adapted to the track, and the protrusion is slidably connected to the track.

[0010] Preferably, the device further includes a hydraulic cylinder for driving the connecting rod to move, with the other end of the connecting rod connected to the hydraulic cylinder.

[0011] Preferably, the movable part is provided with a first connecting hole, the connecting rod is provided with a second connecting hole, and the first connecting hole and the second connecting hole are connected through a first pin; the end of the connecting rod connected to the oil cylinder is provided with a third connecting hole, the oil cylinder is provided with a fourth connecting hole, and the third connecting hole and the fourth connecting hole are connected through a second pin.

[0012] Preferably, the fastener is in the shape of a "semi-disc".

[0013] Preferably, the track is in the shape of a "ring".

[0014] Preferably, the bending angle of the bend is 90°-180°.

[0015] This application has the following advantages: In the embodiments of this application, addressing the problems of unstable core pulling and easy jamming in the prior art, this application provides a solution that uses the sliding track of a movable part to drive the straight tube section and the bent tube section to rotate synchronously and be pulled out. Specifically, it is a demolding device for a straight and bent tube injection mold, including a core assembly and a rotary drive mechanism; the core assembly includes a bent tube section and a straight tube section that are connected; the rotary drive mechanism includes a connector, a movable part, a connecting rod, and a fixed part; one end of the connector is connected to the straight tube section, the other end of the connector is connected to the movable part, the other end of the movable part is connected to the connecting rod, and the fixed part and the movable part are provided with a track on their opposite surfaces, and the movable part is slidably connected to the fixed part along the track; when the connecting rod is pulled, the connecting rod drives the movable part to rotate along the track preset by the fixed part, and drives the straight tube section and the bent tube section to rotate synchronously, so that the bent tube section and the straight tube section are pulled out from the injection molded product. By setting a track on the fixed component and sliding the movable component along the track, the connecting rod drives the movable component to rotate along the preset track, thereby driving the straight tube section and the curved tube section to rotate synchronously for core extraction. This solves the shortcomings of the existing technology in terms of instability and easy jamming during core extraction, making the core extraction process smoother and avoiding jamming. By driving the movable component to rotate along the track with the connecting rod, the synchronous rotation and extraction of the straight tube section and the curved tube section are achieved, which solves the problem of easy scratches, internal deformation, and even cracks on the product surface during the existing core extraction process, avoids scratches and squeezing, and better protects the product's appearance and structural integrity. Attached Figure Description

[0016] To more clearly illustrate the technical solution of this application, the drawings used in the description of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is an exploded view of the structure of a demolding device for a straight-bend pipe injection mold provided in one embodiment of this application; Figure 2 This is a schematic diagram of the structure of a movable component provided in an embodiment of this application; 100. Core assembly; 110. Bend section; 120. Straight section; 121. First positioning groove; 200. Rotary drive mechanism; 210. Connector; 211. First positioning block; 220. Movable part; 221. Groove; 222. Mounting hole; 223. Protrusion; 224. First connecting hole; 230. Connecting rod; 231. Second connecting hole; 232. Third connecting hole; 240. Fixing part; 241. Track; 300. Hydraulic cylinder; 310. Fourth connecting hole. Detailed Implementation

[0018] To make the objectives, features, and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0019] The inventors discovered through analysis of existing technologies that: the core pulling process is not stable, and the straight tube and the curved tube are difficult to move synchronously due to structural differences, which can easily cause jamming; the unstable movement can easily scratch and squeeze the product, resulting in surface scratches, internal deformation, or even cracking.

[0020] Reference Figure 1The image shows an exploded view of a demolding device for a straight-bend injection mold according to an embodiment of this application: it includes a core assembly 100 and a rotary drive mechanism 200; the core assembly 100 includes a connected bend section 110 and a straight section 120; the rotary drive mechanism 200 includes a connector 210, a movable member 220, a connecting rod 230, and a fixing member 240; one end of the connector 210 is connected to the straight section 120, and the other end of the connector 210 is connected to the movable member 220. The other end of 20 is connected to the connecting rod 230. The opposite surfaces of the fixed member 240 and the movable member 220 are provided with a track 241. The movable member 220 is slidably connected to the fixed member 240 along the track 241. When the connecting rod 230 is pulled, the connecting rod 230 drives the movable member 220 to rotate along the track 241 preset by the fixed member 240, and drives the straight tube section 120 and the bent tube section 110 to rotate synchronously, so that the bent tube section 110 and the straight tube section 120 are pulled out from the injection molded product.

[0021] In the embodiments of this application, addressing the problems of unstable core pulling and easy jamming in the prior art, this application provides a solution that uses the track 241 of the movable part 220 to slide and drive the straight tube section 120 and the bent tube section 110 to rotate synchronously and pull them out. Specifically, it is a demolding device for a straight and bent tube injection mold, including a core assembly 100 and a rotary drive mechanism 200; the core assembly 100 includes a bent tube section 110 and a straight tube section 120 that are connected; the rotary drive mechanism 200 includes a connector 210, a movable part 220, a connecting rod 230, and a fixing part 240; one end of the connector 210 is connected to the straight tube section 120. The connector 210 is connected at one end to the movable part 220, and the movable part 220 is connected at the other end to the connecting rod 230. The fixed part 240 and the movable part 220 are provided with a track 241 on their opposite surfaces. The movable part 220 is slidably connected to the fixed part 240 along the track 241. When the connecting rod 230 is pulled, the connecting rod 230 drives the movable part 220 to rotate along the track 241 preset by the fixed part 240, and drives the straight tube part 120 and the bent tube part 110 to rotate synchronously, so that the bent tube part 110 and the straight tube part 120 are pulled out from the injection molded product. By setting a track 241 on the fixed part 240 and sliding the movable part 220 along the track 241, the connecting rod 230 drives the movable part 220 to rotate along the preset track 241 to drive the straight tube part 120 and the bent tube part 110 to rotate synchronously for core pulling. This solves the shortcomings of the existing technology in terms of instability and easy jamming during core pulling, making the core pulling process smoother and avoiding jamming. By driving the movable part 220 to rotate along the track 241 through the connecting rod 230, the straight tube part 120 and the bent tube part 110 can be pulled out synchronously. This solves the problem of easy scratches on the product surface, internal deformation or even cracking during the existing technology in terms of core pulling, avoids scratches and squeezing, and better protects the product's appearance and structural integrity.

[0022] The demolding device for a straight-bend pipe injection mold, as described below in this exemplary embodiment, will be further explained.

[0023] It should be noted that the track 241 is a guide groove 221 or protrusion structure machined on the opposing surfaces of the fixed part 240 and the movable part 220, used to limit the movement path of the movable part 220; the sliding connection emphasizes the low-friction contact state between the movable part 220 and the track 241, allowing relative displacement between the two; the shape of the track 241 is pre-designed so that when the movable part 220 is pulled by the connecting rod 230, it not only slides along the track 241, but also rotates around the center of the fixed part 240 due to the geometric constraint of the track 241, making the rotation smoother.

[0024] As an example, the shape of track 241 may include a straight groove, an arc-shaped annular groove, a spiral groove, or a combination of grooves.

[0025] In one specific implementation, the track 241 is an arc-shaped annular groove. The surface of the fixed part 240 facing the movable part 220 is machined with the arc-shaped annular groove track 241, and the inner wall of the track 241 is polished to reduce friction. The surface of the movable part 220 facing the fixed part 240 is provided with an arc-shaped protrusion 223 that matches the shape of the track 241. The outer edge of the roller is clearance-fitted with the inner wall of the track 241 to form a sliding connection. When the connecting rod 230 is pulled, the connecting rod 230 pushes the movable part 220 to move outward along the arc-shaped track 241. At the same time, due to the curvature constraint of the track 241, the movable part 220 rotates around the central axis of the fixed part 240, causing the straight tube part 120 and the bent tube part 110 to rotate synchronously and detach from the injection molded product. In this process, the arc design of the track 241 not only ensures smooth sliding, but also disperses the core-pulling resistance through rotation, avoiding product deformation due to pulling.

[0026] In one embodiment of this application, the movable member 220 is provided with a groove 221; When the connecting rod 230 drives the movable part 220 to rotate, the groove 221 provides the connecting rod 230 with a space for movement.

[0027] It should be noted that the groove 221 refers to a recessed structure machined on the body of the movable component 220, located around the periphery of the connection area between the movable component 220 and the connecting rod 230. Its depth and width are adapted to the size and range of motion of the connecting rod 230. Providing a space for movement means that when the connecting rod 230 drives the movable component 220 to rotate, the groove 221 allows the connecting rod 230 to generate the necessary relative displacement with respect to the movable component 220, avoiding rigid collisions or motion interference between the connecting rod 230 and the body of the movable component 220 caused by the rotation of the movable component 220. Together, these two constitute a dynamic cooperation mechanism, ensuring the smooth linkage between the connecting rod 230 and the movable component 220.

[0028] As an example, the groove 221 can be a rectangular groove, a U-shaped groove, an arc-shaped groove, a T-shaped groove, or a grid-like shallow groove.

[0029] In one specific implementation, the groove 221 is a rectangular groove. The rectangular groove is located on the outer surface of the movable member 220 and extends inward. The upper side of the groove 221 of the movable member 220 is provided with a first connecting hole 224. The first connecting hole 224 and the second connecting hole 231 are connected by a first pin, so that the movable member 220 can move in the groove 221.

[0030] In one embodiment of this application, the movable part 220 is provided with a mounting hole 222, and the movable part 220 is connected to the rotating shaft of the mold through the mounting hole 222; the center point of the arc surface of the fixed part 240 is concentric with the center point of the rotating shaft.

[0031] It should be noted that the mounting hole 222 on the movable part 220 is used to establish a mechanical connection structure between the movable part 220 and the rotating shaft of the mold, so that the movable part 220 can generate corresponding displacement as the rotating shaft rotates; the design that the center point of the arc surface of the fixed part 240 is concentric with the center point of the rotating shaft is to ensure the spatial matching degree of the rotation trajectory of the arc surface of the fixed part 240 and the rotating shaft, and to ensure the relative positional stability of the movable part 220 and the fixed part 240 when they move.

[0032] As an example, the mounting hole 222 can be in the form of a smooth hole, a threaded hole, or a keyway hole to mate with the rotating shaft.

[0033] In one specific implementation, when a threaded hole is used, an external thread is provided at the end of the rotating shaft and a fixed connection is achieved by locking it with a nut; since the center point of the arc surface of the fixing part 240 is concentric with the center point of the rotating shaft, the rotation trajectory of the rotating shaft can be simulated in advance by three-dimensional modeling software, and milling or casting is performed on the fixing part 240 during the machining stage with the center of its arc surface coinciding with the center of the simulated trajectory as the reference.

[0034] In one embodiment of this application, the straight tube 120 is provided with a first positioning groove 121, and the connector 210 is provided with a first positioning block 211 that matches the first positioning groove 121; When the straight tube 120 is pulled out of the injection molded product, the first positioning groove 121 moves to a preset position and engages with the first positioning block 211.

[0035] It should be noted that the first positioning groove 121 is a rectangular recessed structure on the outer surface of the straight tube section 120, used to accommodate the first positioning block 211; the first positioning block 211 is a rectangular protrusion 223 structure on the connector 210 that is complementary in shape and size to the first positioning groove 121; the snap-fit ​​is a temporary locking state achieved by the first positioning block 211 and the first positioning groove 121 through the interlocking of the protrusions and concave parts, which is intended to fix the posture of the straight tube section 120 in the later stage of core pulling and prevent shaking or displacement. The above design together constitutes a dynamic control mechanism for positioning and locking, ensuring the smooth core pulling of the straight tube section 120.

[0036] As an example, the shape of the first positioning groove 121 can be a dovetail groove, a rectangular groove, a V-shaped groove, or an annular groove.

[0037] In one specific implementation, the first positioning groove 121 is rectangular, the first positioning block 211 is rectangular and its position is fixed, and the straight tube 120 is provided with a plurality of first positioning grooves 121. When the straight tube 120 is pulled out, the first positioning groove 121 moves to the first positioning block 211 and engages and locks.

[0038] Reference Figure 2The diagram shows a schematic diagram of the structure of a movable component 220 provided in an embodiment of this application: In one embodiment of this application, the movable component 220 is provided with a protrusion 223 adapted to the track 241, and the protrusion 223 is slidably connected to the track 241.

[0039] It should be noted that the protrusion 223 is a raised guide structure machined on the movable part 220, located in the area where the movable part 220 contacts the track 241. Its shape and size precisely match the groove or guide rail contour of the track 241 to ensure no interference during movement. The sliding connection refers to the relative displacement between the protrusion 223 and the track 241 through low-friction contact, which differs from a rigid fixed connection and allows the movable part 220 to move smoothly along the preset trajectory of the track 241. Together, they constitute the guiding and limiting mechanism of the protrusion 223 and the track 241, ensuring the movement accuracy and stability of the movable part 220.

[0040] As an example, the type of track 241 can be a semi-circular groove, a straight groove, an arc-shaped annular groove, or a spiral groove.

[0041] In one specific implementation, the track 241 is an arc-shaped annular groove, with its center concentric with the center of the mold's rotation axis. The protrusion 223 and the track 241 are fitted with a clearance fit, and the slider is inserted into the groove of the track 241 through the protrusion 223, forming a sliding connection. When the connecting rod 230 is pulled, the movable part 220 rotates around the rotation axis, and the protrusion 223 slides along the arc-shaped track 241. Simultaneously, due to the curvature constraint of the track 241, the movable part 220 drives the straight tube section 120 and the bent tube section 110 to detach from the injection molded product.

[0042] In one embodiment of this application, the device further includes a hydraulic cylinder 300 for driving the connecting rod 230 to move, and the other end of the connecting rod 230 is connected to the hydraulic cylinder 300.

[0043] It should be noted that the output end of the hydraulic cylinder 300 is connected to the connecting rod 230 to drive the connecting rod 230 to move. The power transmission mechanism of the hydraulic cylinder 300 and the connecting rod 230 can realize the automation and stabilization of the core pulling action.

[0044] As an example, the type of hydraulic cylinder 300 can be a single-acting hydraulic cylinder, a double-acting hydraulic cylinder, or a multi-stage hydraulic cylinder.

[0045] In one embodiment of this application, the movable component 220 is provided with a first connecting hole 224, the connecting rod 230 is provided with a second connecting hole 231, and the first connecting hole 224 and the second connecting hole 231 are connected through a first pin; the end of the connecting rod 230 connected to the oil cylinder is provided with a third connecting hole 232, the oil cylinder 300 is provided with a fourth connecting hole 310, and the third connecting hole 232 and the fourth connecting hole 310 are connected through a second pin.

[0046] It should be noted that the first connecting hole 224, the second connecting hole 231, the third connecting hole 232, and the fourth connecting hole 310 are holes machined on the moving part 220, the connecting rod 230, and the hydraulic cylinder 300, respectively, for the pins to pass through to achieve the connection between the components; the first pin and the second pin are rigid pins, which form a hinge by passing through the two holes; the through connection emphasizes that the pin completely passes through the two holes, and transmits force and movement through the constraint of the hole walls, while allowing a certain angle of deflection between the connected components, ensuring the stability and maintainability of the linkage system.

[0047] As an example, the shape of the connecting hole can be a smooth hole, a threaded hole, a countersunk hole, or a round hole.

[0048] In one specific implementation, the connecting holes are circular holes, the first connecting hole 224 and the second connecting hole 231 are connected by a first pin, and the third connecting hole 232 and the fourth connecting hole 310 are connected by a second pin.

[0049] In one embodiment of this application, the fastener 240 is in the shape of a "semi-disc".

[0050] It should be noted that the semi-circular disk is a fan-shaped planar structure with a central angle of approximately 180°, which combines an arc edge and a flat side. The arc edge can serve as a guide trajectory for the movement of the movable part 220, while the flat side is used for fixed connection with the mold body. The arc edge naturally adapts to the combined rotation and sliding motion of the movable part 220. At the same time, the semi-circular structure saves more mold space than a full-circular disk, making it easier to integrate other functions within a limited area.

[0051] As an example, the shape of the fastener 240 can also be rectangular or irregular.

[0052] In one embodiment of this application, the track 241 is in the shape of a "ring".

[0053] It should be noted that the track 241 is a guide path on the fixed part 240 for the sliding or rotating of the movable part 220, and its function is to constrain the movement trajectory of the movable part 220; the circular shape describes the overall outline of the track 241 as an approximately closed ring structure, which is different from non-closed tracks 241 such as straight lines and arcs. The symmetry of the ring structure can reduce the eccentric force of the movement and improve stability.

[0054] As an example, track 241 can also be rectangular or irregular in shape.

[0055] In one embodiment of this application, the bending angle of the bent section 110 is 90°-180°.

[0056] It should be noted that the bent section 110 is a bent tubular structure in injection molded products that requires core pulling for demolding. The range of "90°-180°" covers right-angle bends, obtuse-angle bends to U-shaped bends, excluding acute-angle bends and complex multi-bend structures.

[0057] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0058] The above provides a detailed description of a demolding device for injection molds of straight and bent pipes provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A demolding device for injection molds of straight and bent pipes, characterized in that, It includes a core assembly and a rotary drive mechanism; the core assembly includes a connected bent tube section and a straight tube section; The rotary drive mechanism includes a connector, a movable component, a connecting rod, and a fixed component; one end of the connector is connected to the straight tube section, the other end of the connector is connected to the movable component, the other end of the movable component is connected to the connecting rod, and a track is provided on the opposite side of the fixed component and the movable component, and the movable component is slidably connected to the fixed component along the track; When the connecting rod is pulled, the connecting rod drives the movable part to rotate along the preset track of the fixed part, and drives the straight tube part and the bent tube part to rotate synchronously, so that the bent tube part and the straight tube part are pulled out from the injection molded product.

2. The demolding device for straight and bent pipe injection molds according to claim 1, characterized in that, The movable component is provided with a groove; When the connecting rod drives the movable part to rotate, the groove provides the connecting rod with room to move.

3. The demolding device for injection molds of straight and bent pipes according to claim 1, characterized in that, The movable part is provided with a mounting hole, and the movable part is connected to the rotating shaft of the mold through the mounting hole; the center point of the arc surface of the fixed part is concentric with the center point of the rotating shaft.

4. The demolding device for a straight-bend pipe injection mold according to claim 1, characterized in that, The straight pipe section is provided with a first positioning groove, and the connector is provided with a first positioning block that matches the first positioning groove; When the straight tube is pulled out of the injection molded product, the first positioning groove moves to a preset position and engages with the first positioning block.

5. The demolding device for a straight-bend pipe injection mold according to claim 1, characterized in that, The movable component is provided with a protrusion that is adapted to the track, and the protrusion is slidably connected to the track.

6. The demolding device for a straight-bend pipe injection mold according to claim 1, characterized in that, The device also includes a hydraulic cylinder for driving the connecting rod to move, with the other end of the connecting rod connected to the hydraulic cylinder.

7. The demolding device for a straight-bend pipe injection mold according to claim 6, characterized in that, The movable part is provided with a first connecting hole, and the connecting rod is provided with a second connecting hole. The first connecting hole and the second connecting hole are connected through a first pin. The end of the connecting rod connected to the oil cylinder is provided with a third connecting hole, and the oil cylinder is provided with a fourth connecting hole. The third connecting hole and the fourth connecting hole are connected through a second pin.

8. The demolding device for a straight-bend pipe injection mold according to claim 1, characterized in that, The fastener is semi-circular in shape.

9. The demolding device for a straight-bend pipe injection mold according to claim 5, characterized in that, The track is circular.

10. The demolding device for a straight-bend pipe injection mold according to claim 1, characterized in that, The bending angle of the bend is 90°-180°.

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