Injection mold for straight and bent pipes

Abstract

The invention provides an injection mold for straight and bent pipes. The injection mold comprises a mold frame and a demolding device. The mold frame comprises a front mold frame, a front mold core, a rear mold core and a rear mold frame; the demolding device comprises a mold core assembly and a rotary driving mechanism; the mold core assembly comprises a bent pipe part and a straight pipe part which are communicated; 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, rails are arranged on the opposite faces of the fixed piece and the movable piece, and the movable piece is slidably connected with the fixed piece along the rails; when the connecting rod is pulled, the connecting rod drives the movable part to rotate along a preset track of the fixed part 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 of the injection product. And through linkage design, the straight pipe part and the bent pipe part rotate synchronously and are pulled out in a sliding mode along the track, taking out from injection products is facilitated, and operation is smooth and efficient.

Description

Technical Field

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

[0002] Existing technologies, based on traditional core-pulling mechanisms, use a single-direction power source such as inclined guide pillars, sliders, or hydraulic drives to move the core corresponding to the straight or curved tube cavity in a linear or simple curved motion. Separation of the core from the injection molded part is achieved through mechanical linkage. Demolding is accomplished by controlling the displacement of the drive components, relying on a preset fixed core-pulling path.

[0003] This mold is mainly used for injection molding of plastic products with straight and curved pipe sections. By extracting the core embedded inside the product after injection molding, the product that originally wrapped the core can be easily demolded, realizing the mass production of pipe structures.

[0004] However, the following problems still exist during use: jamming or instability may occur during the core pulling process; the core pulling direction is unidirectional, and the product is prone to deformation or scratch damage to the inner wall. Summary of the Invention

[0005] In view of the aforementioned problems, this application is made to provide an injection mold for straight-bend pipes that overcomes or at least partially solves the aforementioned problems, comprising: An injection mold for straight and bent pipes includes a mold base and a demolding device; the mold base includes a front mold base, a front mold core, a rear mold core, and a rear mold base; one side of the front mold core is connected to the front mold base, the other side of the front mold core is connected to the rear mold core, and the other side of the rear mold core is connected to the rear mold base; the front mold core and the rear mold core share a cavity, and the cavity is connected to the demolding device; The demolding device includes a core assembly and a rotary drive mechanism; the core assembly includes a connected curved section and a straight 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.

[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 cavity includes a rotating shaft, the movable part is provided with a mounting hole, and the movable part is connected to the rotating shaft 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 cavity further includes a fixing seat, and the other end of the bent tube is detachably connected to the fixing seat; During injection molding, the bent section is connected to the fixed base; When demolding, the bent tube part is disconnected from the fixed base, and the rotary drive mechanism drives the bent tube part to be pulled out of the injection molded product.

[0009] Preferably, the bent section is provided with a first connecting block, the fixed base is provided with a first connecting groove, and the first connecting block and the first connecting groove are detachably connected.

[0010] 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.

[0011] Preferably, the movable component is provided with a protrusion adapted to the track, and the protrusion is slidably connected to the track.

[0012] Preferably, the demolding device further includes a hydraulic cylinder for driving the connecting rod to move, and the other end of the connecting rod is connected to the hydraulic cylinder.

[0013] Preferably, the rear mold frame includes a first ejector plate, a second ejector plate, a slide rod, and ejector pins; the slide rod slidably connects the first ejector plate and the second ejector plate, and the first ejector plate is provided with a first rod hole that matches the shape of the ejector pin; When the injection molded product is ejected, the second ejector plate pushes the ejector pin through the first rod hole and the cavity to eject the injection molded product.

[0014] Preferably, the sliding direction of the first ejector plate and the second ejector plate is from the rear mold frame to the front mold frame.

[0015] This application has the following advantages: In the embodiments of this application, addressing the problem of jamming or instability in the core-pulling process of the prior art, this application provides a solution that uses the sliding track of a movable component to drive the straight tube section and the bent tube section to rotate synchronously and be pulled out. Specifically, it provides an injection mold for straight and bent tubes, including a mold frame and a demolding device; the mold frame includes a front mold frame, a front mold core, a rear mold core, and a rear mold frame; one side of the front mold core is connected to the front mold frame, the other side of the front mold core is connected to the rear mold core, and the other side of the rear mold core is connected to the rear mold frame; the front mold core and the rear mold core together have a cavity, and the cavity is connected to the demolding device; the demolding device 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 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, 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 extracted from the injection molded product. The rotary drive mechanism uses a connector that links one end to the straight tube section and the other end to a movable part. The movable part is linked by a connecting rod and slidably connected to the track of the fixed part. When the connecting rod is pulled, the movable part rotates along the track, causing the straight tube section and the curved tube section to rotate synchronously and be pulled out. This solves the shortcomings of the existing technology, such as easy jamming or instability during the core pulling process. It makes the core pulling trajectory stable and controllable, avoids jamming, and improves the smoothness of core pulling. The rotary drive mechanism enables the straight tube section and the curved tube section to rotate synchronously and be pulled out. The rotation trajectory is constrained by the preset track of the fixed part. This solves the shortcomings of the existing technology, such as the single core pulling direction, easy product deformation, or scratch damage to the inner wall. By balancing the distribution of multi-directional demolding forces, it reduces unidirectional stress and avoids product deformation and scratch damage to the inner wall. 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 a schematic diagram of the structure of an injection mold for straight and bent pipes provided in one embodiment of this application; Figure 2 This is a schematic diagram of the structure of an injection mold for straight and bent pipes provided in one embodiment of this application; Figure 3This is an exploded view of the demolding device provided in one embodiment of this application; Figure 4 This is a schematic diagram of the structure of a movable component provided in an embodiment of this application; 100. Demolding device; 110. Core assembly; 111. Bending section; 112. Straight section; 1121. First positioning groove; 120. Rotary drive mechanism; 121. Connecting piece; 1211. First positioning block; 122. Moving part; 1221. Groove; 1222. Mounting hole; 1223. Protrusion; 123. Connecting rod; 124. Fixing piece; 1241. Track; 130. Hydraulic cylinder; 200. Cavity; 300. Mold frame; 310. Front mold frame; 320. Front mold core; 330. Rear mold core; 340. Rear mold frame. 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: they cannot stably adapt to the different core-pulling requirements of straight and curved pipes, and jamming or instability is likely to occur during the core-pulling process; the core-pulling direction is unidirectional, making it difficult to balance the demolding force distribution of the multi-directional bending trajectory of the curved pipe, which can easily lead to deformation of the product due to unidirectional stress or scratch damage to the inner wall.

[0020] Reference Figure 1-3This illustration shows a structural schematic diagram of an injection mold for straight and bent pipes according to an embodiment of this application: it includes a mold base 300 and a demolding device 100; the mold base 300 includes a front mold base 310, a front mold core 320, a rear mold core 330, and a rear mold base 340; one side of the front mold core 320 is connected to the front mold base 310, the other side of the front mold core 320 is connected to the rear mold core 330, and the other side of the rear mold core 330 is connected to the rear mold base 340; the front mold core 320 and the rear mold core 330 jointly form a cavity 200, and the cavity 200 is connected to the demolding device 100; the demolding device 100 includes a core assembly 110 and a rotary drive mechanism 120; the core assembly 110 includes a connected bent pipe section 111 and a straight pipe section 112; the rotary drive mechanism 120... Mechanism 120 includes a connector 121, a movable part 122, a connecting rod 123, and a fixing part 124. One end of the connector 121 is connected to the straight tube section 112, and the other end of the connector 121 is connected to the movable part 122. The other end of the movable part 122 is connected to the connecting rod 123. The fixing part 124 and the movable part 122 are provided with a track 1241 on their opposite surfaces. The movable part 122 is slidably connected to the fixing part 124 along the track 1241. When the connecting rod 123 is pulled, the connecting rod 123 drives the movable part 122 to rotate along the track 1241 of the fixing part 124, and drives the straight tube section 112 and the bent tube section 111 to rotate synchronously, so that the bent tube section 111 and the straight tube section 112 are extracted from the injection molded product.

[0021] In the embodiments of this application, addressing the problem of jamming or instability in the core-pulling process of the prior art, this application provides a solution for synchronously rotating and pulling out the straight tube section 112 and the bent tube section 111 by sliding the track 1241 of the movable part 122. Specifically, it is an injection mold for straight and bent tubes, including a mold frame 300 and a demolding device 100; the mold frame 300 includes a front mold frame 310, a front mold core 320, a rear mold core 330, and a rear mold frame 340; one side of the front mold core 320 is connected to the front mold frame 310, the other side of the front mold core 320 is connected to the rear mold core 330, and the other side of the rear mold core 330 is connected to the rear mold frame 340; the front mold core 320 and the rear mold core 330 jointly form a cavity 200, and the cavity 200 is connected to the demolding device 100; the demolding device 100 includes a core assembly 110 and a rotary drive mechanism 120. The core assembly 110 includes a connected bent tube section 111 and a straight tube section 112; the rotary drive mechanism 120 includes a connector 121, a movable member 122, a connecting rod 123, and a fixing member 124; one end of the connector 121 is connected to the straight tube section 112, the other end of the connector 121 is connected to the movable member 122, the other end of the movable member 122 is connected to the connecting rod 123, and the fixing member 124 and the movable member 122 are provided with a track 1241 on their opposite surfaces, and the movable member 122 is slidably connected to the fixing member 124 along the track 1241; when the connecting rod 123 is pulled, the connecting rod 123 drives the movable member 122 to rotate along the track 1241 preset by the fixing member 124, and drives the straight tube section 112 and the bent tube section 111 to rotate synchronously, so that the bent tube section 111 and the straight tube section 112 are extracted from the injection molded product. The rotary drive mechanism 120 uses a connector 121 to connect one end of the straight tube section 112 and the other end to the movable part 122. The movable part 122 is linked by a connecting rod 123 and slidably connected to the track 1241 of the fixed part 124. When the connecting rod 123 is pulled, the movable part 122 rotates along the track 1241 and drives the straight tube section 112 and the bent tube section 111 to rotate synchronously and be pulled out. This solves the shortcomings of easy jamming or instability in the core pulling process in the prior art, making the core pulling trajectory stable and controllable, avoiding jamming, and improving the stability of core pulling. The rotary drive mechanism 120 makes the straight tube section 112 and the bent tube section 111 rotate synchronously and be pulled out, and the rotation trajectory is constrained by the preset track 1241 of the fixed part 124. This solves the shortcomings of the prior art that the core pulling direction is unidirectional, the product is easy to deform or the inner wall is scratched and damaged. By balancing the distribution of multi-directional demolding force, the unidirectional stress is reduced, and the product deformation and inner wall scratch damage are avoided.

[0022] The following will further describe an injection mold for a straight-bend pipe in this exemplary embodiment.

[0023] It should be noted that synchronous rotation means that the straight tube section 112 and the bent tube section 111 are fixed together by the connector 121, and rotate in coordination around a common axis during core pulling to avoid relative displacement between the two causing jamming; the preset track 1241 is a specific trajectory machined on the fixed part 124, which is used to constrain the movement path of the moving part 122 and convert the linear tension of the connecting rod 123 into a controllable rotational output.

[0024] As an example, track 1241 can be designed as an arc-shaped groove, an annular closed guide rail, or a spiral groove.

[0025] In one specific implementation, the track 1241 is designed as an arc-shaped groove, and the surface of the fixed part 124 facing the movable part 122 is machined with an arc-shaped groove; the surface of the movable part 122 facing the fixed part 124 is provided with an arc-shaped protrusion that matches the shape of the track 1241, and the outer edge of the roller is clearance-fitted with the inner wall of the track 1241 to form a sliding connection. When the connecting rod 123 is pulled, the connecting rod 123 pushes the movable part 122 to move outward along the arc-shaped track 1241. At the same time, due to the curvature constraint of the track 1241, the movable part 122 rotates around the central axis of the fixed part 124, causing the straight tube part 112 and the bent tube part 111 to rotate synchronously and detach from the injection molded product. The arc-shaped groove track precisely constrains the movement of the movable part 122 through a preset arc trajectory, converting the linear tension of the connecting rod 123 into a controllable rotational output, ensuring that the straight tube part 112 and the bent tube part 111 rotate strictly synchronously, and avoiding jamming caused by trajectory deviation.

[0026] In one embodiment of this application, the movable member 122 is provided with a groove 1221; When the connecting rod 123 drives the movable part 122 to rotate, the groove 1221 provides the connecting rod 123 with a space for movement.

[0027] It should be noted that the groove 1221 is a groove opened on the movable part 122 in the area where it connects with the connecting rod 123. Its essence is a dynamic avoidance structure, which is used to provide the connecting rod 123 with space for swinging, translation or angle adjustment relative to the movable part 122 when the movable part 122 is driven to rotate by the connecting rod 123, so as to avoid mechanical interference between the movable part 122 and the connecting rod 123, which would cause the transmission to be interrupted.

[0028] As an example, the shape of the groove 1221 can be U-shaped, arc-shaped, or rectangular.

[0029] In one specific implementation, the groove 1221 is arc-shaped, and the arc-shaped groove is provided on the outer surface of the movable member 122 and extends inward, so that the movable member 122 can move within the groove 1221.

[0030] In one embodiment of this application, the cavity 200 includes a rotating shaft, the movable member 122 is provided with a mounting hole 1222, and the movable member 122 is connected to the rotating shaft through the mounting hole 1222; the center point of the arc surface of the fixed member 124 is concentric with the center point of the rotating shaft.

[0031] It should be noted that the mounting hole 1222 is a hole structure on the movable part 122 that mates with the rotating shaft. Through interference fit, bearings, or bushings, the movable part 122 and the rotating shaft are coaxially connected, ensuring that the movable part 122 can only rotate around the rotating shaft. The concentricity of the arc surface center of the fixed part 124 with the center point of the rotating shaft means that the geometric center of the arc surface on the fixed part 124 that constrains the movement of the movable part 122 completely coincides with the rotation center point of the rotating shaft. This design ensures that when the movable part 122 rotates, the distance between its trajectory and the center of the rotating shaft remains constant, avoiding trajectory deviation, jamming, or additional radial force caused by eccentricity.

[0032] As an example, mounting hole 1222 can be designed as a through hole or a blind hole.

[0033] In one embodiment of this application, the cavity 200 further includes a fixing seat, and the other end of the bent tube portion 111 is detachably connected to the fixing seat; During injection molding, the bent tube 111 is connected to the fixed base; When demolding, the bent tube 111 is disconnected from the fixed base, and the rotary drive mechanism 120 drives the bent tube 111 to be pulled out of the injection molded product.

[0034] It should be noted that the fixed seat is a pre-set rigid support structure on the cavity 200, used to temporarily fix the non-core-pulling end of the bent tube 111 during injection molding, ensuring the integrity of the cavity 200 during the injection molding process; the detachable connection means that the bent tube 111 and the fixed seat can be quickly assembled and separated through a non-permanent structure. Its essence is a temporary positioning and active release mechanism. It is connected during injection molding to provide stable support, and disconnected during demolding to eliminate obstruction of the core-pulling path; the rotary drive mechanism 120, after disconnection, drives the straight tube 112 and the bent tube 111 to rotate synchronously, so as to achieve smooth extraction from the inner wall of the product.

[0035] As an example, detachable connection methods can include bolt fastening, spring pins, magnetic adsorption, or quick-change clips.

[0036] In one specific implementation, the detachable connection method is bolt fastening. The other end of the bent tube 111 is assembled with the fixed seat by bolt fastening: Before injection molding, the positioning pin of the bent tube 111 is inserted into the pin hole of the fixed seat, and then the threaded hole at the tail end is fastened to the threaded hole of the horizontal plate of the fixed seat with an internal hex bolt to ensure that the bent tube 111 is coaxial with the cavity 200. During demolding, the bolts are loosened first to disconnect the bent tube 111 from the fixed seat. At this time, the rotary drive mechanism 120 is in place, and the connecting rod 123 is pulled to drive the movable part 122 to rotate around the rotating axis. The bent tube 111 is pulled out from the hydraulic tube synchronously with the straight tube 112.

[0037] In one embodiment of this application, the bent pipe portion 111 is provided with a first connecting block, and the fixed base is provided with a first connecting groove, wherein the first connecting block and the first connecting groove are detachably connected.

[0038] It should be noted that the first connecting block is a pre-set protruding structure on the non-core-pulling end of the bent pipe section 111, used to establish physical docking with the fixed seat; the first connecting groove is a groove-shaped structure 1221 on the fixed seat that matches it, and achieves precise positioning through geometric contour.

[0039] As an example, detachable connections can be secured by bolts, spring pins, magnetic attachment, or quick-release clips.

[0040] In one embodiment of this application, the straight tube 112 is provided with a first positioning groove 1121, and the connector 121 is provided with a first positioning block 1211 that matches the first positioning groove 1121; When the straight tube 112 is pulled out of the injection molded product, the first positioning groove 1121 moves to a preset position and engages with the first positioning block 1211.

[0041] It should be noted that the first positioning groove 1121 is a groove 1221 structure pre-set on the outer surface of the straight tube 112, which is used to establish a temporary positioning interface with the connector 121; the first positioning block 1211 is a protrusion structure on the connector 121 that is complementary to the geometric contour of the positioning groove, and achieves precise docking through shape matching; matching means that the two are strictly corresponding in size and shape to ensure that there is no looseness after assembly.

[0042] As an example, the first positioning groove 1121 and the first positioning block 1211 can be engaged by a snap-fit, a bevel, or a spring structure.

[0043] Reference Figure 4 The diagram shows a schematic diagram of the structure of a movable member 122 provided in an embodiment of the present application: In one embodiment of the present application, the movable member 122 is provided with a protrusion 1223 adapted to the track 1241, and the protrusion 1223 is slidably connected to the track 1241.

[0044] It should be noted that the protrusion 1223 is a raised structure on the moving part 122 that directly contacts the track 1241. Its essence is a motion guide carrier, which is used to convert the driving force of the connecting rod 123 into motion along a preset trajectory. The geometry and size of the protrusion 1223 are completely matched with the groove and curved surface of the track 1241 to ensure that the motion trajectory is unique and without deviation, thereby reducing friction loss.

[0045] As an example, track 1241 can be an arc-shaped groove 1221, a linear guide, or a spiral groove.

[0046] In one embodiment of this application, the demolding device 100 further includes a hydraulic cylinder 130 for driving the connecting rod 123 to move, and the other end of the connecting rod 123 is connected to the hydraulic cylinder 130.

[0047] It should be noted that the hydraulic cylinder 130 is the power actuator of the demolding device 100. It generates linear driving force through the pressure difference between the input and output of hydraulic oil. In essence, it is a controllable power source that replaces unstable driving methods such as manual and pneumatic. The movement of the drive rod 123 means that when the piston rod of the hydraulic cylinder 130 extends or retracts, the linear displacement is converted into the rotation or oscillation of the moving part 122 through the drive rod 123.

[0048] As an example, the 130 type of hydraulic cylinder can be a single-acting hydraulic cylinder, a double-acting hydraulic cylinder, or a plunger-type hydraulic cylinder.

[0049] In one embodiment of this application, the rear mold frame 340 includes a first ejector plate, a second ejector plate, a slide rod, and ejector pins; the slide rod slidably connects the first ejector plate and the second ejector plate, and the first ejector plate is provided with a first rod hole that matches the shape of the ejector pin; When the injection molded product is ejected, the second ejector plate pushes the ejector pin through the first rod hole and the cavity 200 to eject the injection molded product.

[0050] It should be noted that the rear mold base 340 is the frame structure that supports the ejection system in the mold, and its function is to transmit the ejection force of the injection molding machine; the slide bar is a guide that passes through the first and second ejector plates, and ensures that the two ejector plates move in parallel through sliding connection, while bearing the lateral force during ejection; the first rod hole is a hole on the first ejector plate that is perfectly matched with the geometry of the ejector pin, and is used to constrain the ejector pin to move along a fixed path.

[0051] As an example, the sliding bar can be a smooth bar, a bar with a limiting step, or a hollow bar.

[0052] In one embodiment of this application, the sliding direction of the first ejector plate and the second ejector plate is from the rear mold frame 340 to the front mold frame 310.

[0053] It should be noted that the sliding direction refers to the direction of the ejector plate's movement trajectory during the ejection process; the rear mold base 340 is the moving mold side frame of the mold, and the front mold base 310 is the fixed mold side frame. The two are separated in the mold opening state.

[0054] 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.

[0055] The above provides a detailed description of an injection mold for 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. An injection mold for straight and bent pipes, characterized in that, The device includes a mold frame and a demolding device; the mold frame includes a front mold frame, a front mold core, a rear mold core, and a rear mold frame; one side of the front mold core is connected to the front mold frame, the other side of the front mold core is connected to the rear mold core, and the other side of the rear mold core is connected to the rear mold frame; the front mold core and the rear mold core together have a cavity, and the cavity is connected to the demolding device; The demolding device includes a core assembly and a rotary drive mechanism; the core assembly includes a connected curved section and a straight 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 injection mold for straight and bent pipes 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 injection mold for straight and bent pipes according to claim 1, characterized in that, The cavity includes a rotating shaft, the movable part is provided with a mounting hole, and the movable part is connected to the rotating shaft 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 injection mold for straight and bent pipes according to claim 3, characterized in that, The cavity also includes a fixing seat, and the other end of the bent tube is detachably connected to the fixing seat; During injection molding, the bent section is connected to the fixed base; When demolding, the bent tube part is disconnected from the fixed base, and the rotary drive mechanism drives the bent tube part to be pulled out of the injection molded product.

5. The injection mold for straight and bent pipes according to claim 4, characterized in that, The bent section is provided with a first connecting block, and the fixed base is provided with a first connecting groove. The first connecting block and the first connecting groove are detachably connected.

6. The injection mold for straight and bent pipes 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.

7. The injection mold for straight and bent pipes 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.

8. The injection mold for straight and bent pipes according to claim 1, characterized in that, The demolding 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.

9. The injection mold for straight and bent pipes according to claim 1, characterized in that, The rear mold frame includes a first ejector plate, a second ejector plate, a slide rod, and ejector pins; the slide rod slidably connects the first ejector plate and the second ejector plate, and the first ejector plate is provided with a first rod hole that matches the shape of the ejector pin; When the injection molded product is ejected, the second ejector plate pushes the ejector pin through the first rod hole and the cavity to eject the injection molded product.

10. The injection mold for straight and bent pipes according to claim 9, characterized in that, The first ejector plate and the second ejector plate slide in the direction from the rear mold frame to the front mold frame.

Images