Rotary demolding mold for injection molding of quarter ring pipe fitting

Abstract

The utility model discloses a rotary demolding mold for injection molding of a quarter ring pipe fitting, which relates to the technical field of injection molding of pipe fittings and comprises an injection molding fixed mold, an injection molding movable mold, a sideslip demolding part and a rotary demolding part, during injection molding production of a quarter ring pipe fitting, the demolding problem of a product in a complex shape is solved through the synergistic effect of the rotary demolding part and the side sliding demolding part, the demolding efficiency is improved, the production period is shortened, and the actual production takt is within 70 seconds; water channels are respectively arranged in the fixed mold insert and the movable mold insert, and water channels are also respectively arranged in the mold core and the side sliding block, so that a product can be uniformly cooled inside and outside in the injection molding process, and the size precision and the surface quality of the product are ensured; the mold is compact in overall structural design, all parts are accurately matched, the service life of the mold is prolonged, and disassembly and maintenance are convenient.

Description

Technical Field

[0001] This utility model relates to the field of pipe injection molding technology, specifically a rotary demolding mold for injection molding of quarter-ring pipe fittings. Background Technology

[0002] In the field of injection molding technology, especially in the production of pipe fittings with complex shapes and structures, the demolding process has always been one of the technical challenges. Traditional injection mold demolding methods, such as direct ejection or simple side-sliding demolding, often fail to meet the demolding requirements of complex-shaped products.

[0003] like Figure 12 The illustration shows a plastic drain pipe fitting, which is a quarter-ring fitting with inner circular holes at both ends for sealing welding. For the injection molding production of plastic products with complex structures such as inner circular holes, traditional demolding methods can easily lead to scratches and deformation on the product surface, or even failure to demold smoothly, making it difficult to guarantee the injection molding production cycle and also difficult to guarantee product precision.

[0004] Furthermore, existing injection molds suffer from insufficient cooling efficiency. An inadequately designed cooling system can lead to uneven cooling, affecting product precision and quality. For products requiring high precision and good sealing, such as drain pipe fittings, insufficient cooling can result in dimensional instability, consequently impacting sealing performance. Utility Model Content

[0005] The purpose of this utility model is to provide a rotary demolding mold for injection molding of quarter-ring pipe fittings, so as to solve the problems mentioned in the background art. When producing plastic products with complex structures, traditional injection molds are prone to surface scratches, deformation, or even failure to demold smoothly, making it difficult to guarantee the injection molding production cycle and product precision.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a rotary demolding mold for injection molding of a quarter-ring pipe fitting, comprising a fixed injection mold and a moving injection mold, with a rotary demolding part and a side-sliding demolding part provided between the two molds; the fixed injection mold comprises an I-beam plate and a fixed template arranged vertically, the bottom surface of the fixed template having an upwardly recessed groove and a fixed mold insert embedded therein, the bottom surface of the fixed mold insert having an upwardly recessed quarter-ring pipe fitting groove; the moving injection mold comprises an I-beam base plate and base plate protrusions fixedly connected to the top surface of the base plate protrusions near the two long sides, the top surface of the two base plate protrusions having a moving template and a downwardly recessed groove on its top surface and a moving mold insert embedded therein. The mold insert has a recessed quarter-ring tube groove on its top surface. A face pin plate and a bottom pin plate are positioned vertically between the two bottom plate protrusions, with multiple ejector pins on the face pin plate. A square post penetrating the moving template is provided on one end of the quarter-ring tube groove on the face pin plate, and a product core is provided on the side near the quarter-ring tube groove. A side-sliding ejector part is provided at the other end of the product core through the fixed template and the moving template. A rotating ejector part, penetrating the bottom pin plate, face pin plate, moving template, and mold insert, is also provided through the I-beam base plate and positioned at the center of the quarter-ring tube groove.

[0007] Preferably, the side-sliding demolding part includes a downwardly extending inclined guide post and a wedge block provided on the bottom surface of the fixed template. The wedge block has an inclined surface parallel to the inclined guide post on its side near the inclined guide post. A side slider is provided on the top surface of the moving template via a horizontal guide slide. The side slider has an inclined guide hole that matches the inclined guide post, and an inclined surface parallel to the inclined surface of the wedge block on its outer side. A reset rod extending horizontally outward is provided on the rear side of the side slider. The reset rod passes through a positioning block provided on the top surface of the moving template. A reset spring is sleeved on the rear side of the positioning block and the end is locked and fixed by a bolt. A side-sliding short core is provided on the side of the side slider near the product core and is tightly connected to it.

[0008] Preferably, the rotary demolding part includes a rotary hydraulic cylinder disposed on the I-beam base plate, and its shaft is connected to a drive rack. The drive rack is meshed with a transmission gear. The axis of the transmission gear coincides with the center of the groove of the quarter-ring tube and is disposed with a rotary shaft that passes through the bottom pin plate, the top pin plate, the moving template, and the moving mold insert in sequence. A drive rotary column with a reduced diameter is disposed coaxially at the top of the rotary shaft, and sliding keys parallel to its axis are embedded on both sides of the drive rotary column. A turntable sliding limit pad is disposed at the top. A rotary disk is sleeved on the outside of the drive rotary column and the sliding keys. A rotary push plate extends radially from the rotary disk. The rotary push plate is provided with a hollow circular hole and is sleeved on the outside of the product core. The bottom surface of the rotary disk is connected to four rectangularly arranged demolding ejector pins.

[0009] Preferably, the fixed mold insert and the moving mold insert are respectively provided with a fixed mold water channel and a moving mold water channel near the groove of the quarter-ring pipe fitting. The fixed mold water channel is provided with a water channel interface on the side of the fixed mold plate. The moving mold water channel is provided with a water channel interface on the side of the moving mold plate. The square column and the product core are provided with a core water channel, and the square column is provided with a water channel interface on the outer side surface. The side slider and the side sliding short core are provided with a short core water channel, and the side slider is provided with a water channel interface on the outer side surface.

[0010] Preferably, a positioning ring is provided at the center of the top surface of the I-beam panel, and a sprue channel is provided at the center of the ring, which sequentially passes through the I-beam panel, the fixed template, and the fixed template insert, and a sprue sleeve is provided around the sprue channel.

[0011] Preferably, the I-beam base plate is provided with a plurality of ejector through holes, and an ejector pad fixed to the base pin plate is provided in each ejector through hole.

[0012] Preferably, a return rod is provided at each of the four corners of the needle plate, and a return spring is sleeved on the outside of the return rod and placed between the needle plate and the moving template; a guide sleeve is provided at each of the four corners of the fixed template, and a guide rod that can be inserted into the guide sleeve is provided at each of the four corners of the moving template.

[0013] Preferably, the top surface of the I-beam base plate is also provided with a plurality of ejection limiting pads.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. In the injection molding production of quarter-ring pipe fittings, this utility model effectively solves the demolding problem of complex-shaped products through the synergistic effect of the rotating demolding part and the side-sliding demolding part, and improves demolding efficiency and shortens the production cycle. Actual application testing shows that the production cycle is within 70 seconds.

[0016] 2. Water channels are provided in the fixed mold insert and the moving mold insert, and water channels are also provided in the core and the side slide block. This ensures that the product can be cooled evenly inside and out during the injection molding process, guaranteeing the dimensional accuracy and surface quality of the product, and effectively avoiding dimensional deviations caused by insufficient cooling.

[0017] 3. The mold provided by this utility model has a compact overall structure and precise matching between its components, which not only improves the service life of the mold, but also facilitates disassembly and maintenance. Attached Figure Description

[0018] Figure 1 This is an isometric drawing of the present invention;

[0019] Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the internal structure of this utility model;

[0021] Figure 4 This is a schematic diagram of the side-sliding demolding section structure;

[0022] Figure 5 This is a schematic diagram of the core water channel inside the product core;

[0023] Figure 6 A schematic diagram of the short core water channel inside a side-slip short core;

[0024] Figure 7 This is a schematic diagram showing the rotating demolding section in the closed state.

[0025] Figure 8 This is a schematic diagram showing the separation of the side-sliding demolding section;

[0026] Figure 9 This is a schematic diagram of the ejection mechanism using a rotating demolding section.

[0027] Figure 10 This is a partial demolding diagram of the product;

[0028] Figure 11 This is a schematic diagram showing the complete demolding of the product;

[0029] Figure 12 This is a product illustration;

[0030] In the diagram: Injection mold fixed mold-1, I-beam face plate-101, fixed mold plate-102, fixed mold insert-103, locating ring-104, sprue runner-105, sprue bushing-106, guide bushing-107, fixed mold water channel-108, injection mold moving mold-2, I-beam base plate-201, base plate protrusion-202, moving mold plate-203, moving mold insert-204, face pin plate-205, bottom pin plate-206, ejector pin-207, square column-208, product core-209, ejector through hole-210, ejector pad-211, return rod-212, return spring-213, guide rod-214, moving mold Water channel-215, core water channel-217, ejection limit pad-218, side sliding demolding part-3, inclined guide pillar-301, wedge block-302, side slider-303, inclined guide hole-304, reset rod-305, positioning block-306, reset spring-307, side sliding short core-308, short core water channel-309, rotating demolding part-4, rotating hydraulic cylinder-401, drive rack-402, transmission gear-403, rotating shaft-404, drive rotating pillar-405, sliding key-406, turntable sliding limit pad-407, rotating disk-408, rotating push plate-409. Detailed Implementation

[0031] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments.

[0032] Please refer to Figure 1-12 , Figure 1 This is an isometric drawing of the present invention; Figure 2 This is a schematic diagram of the internal structure of this utility model; Figure 3 This is a schematic diagram of the internal structure of this utility model; Figure 4 This is a schematic diagram of the side-sliding demolding section structure;

[0033] Figure 5 This is a schematic diagram of the core water channel inside the product core; Figure 6 A schematic diagram of the short core water channel inside a side-slip short core; Figure 7 This is a schematic diagram showing the rotating demolding section in the closed state. Figure 8 This is a schematic diagram showing the separation of the side-sliding demolding section; Figure 9 This is a schematic diagram of the ejection mechanism using a rotating demolding section. Figure 10 This is a partial demolding diagram of the product; Figure 11 This is a schematic diagram showing the complete demolding of the product; Figure 12 This is a product illustration.

[0034] This utility model provides a rotary demolding mold for injection molding of quarter-ring pipe fittings. When injection molding quarter-ring pipe fittings, a rotary motion is generated by a hydraulic cylinder and a gear and rack transmission mechanism to automatically demold the quarter ring of the plastic part from the ring core. It includes a fixed injection mold 1 and a moving injection mold 2, and a rotary demolding part 3 and a side-sliding demolding part 4 are provided between the fixed injection mold 1 and the moving injection mold 2.

[0035] The injection mold 1 includes an I-beam panel 101 connected to the injection molding machine fixing plate. A fixed template 102 is provided below the I-beam panel 101. A recessed groove is provided on the bottom surface of the fixed template 102, and a fixed mold insert 103 is embedded therein. A quarter-ring tube groove is provided on the bottom surface of the fixed mold insert 103. A positioning ring 104 is provided at the center of the top surface of the I-beam panel 101. A sprue runner 105 is provided at the center of the positioning ring 104, which passes through the I-beam panel 101, the fixed template 102, and the fixed mold insert 103 in sequence. A sprue sleeve 106 is provided around the sprue runner 105.

[0036] The injection molding moving mold 2 includes an I-beam base plate 201 connected to the movable plate of the injection molding machine. Base plate protrusions 202 are fixedly connected to the top surface of the I-beam base plate 201 near the two long sides. Moving mold plates 203 are provided on the top surfaces of the two base plate protrusions 202. A recessed groove is provided on the top surface of the moving mold plate 203, and a moving mold insert 204 is embedded therein. A recessed quarter-ring tube groove is provided on the top surface of the moving mold insert 204. An upper face pin plate 205 and a lower bottom pin plate 206 are provided between the two base plate protrusions 202. Multiple ejector pins 207 are provided on the face pin plate 205. A square post 208 is provided at one end of the groove of the quarter-ring pipe fitting on 205. The square post 208 passes through the moving template 203 and a product core 209 that matches the groove of the quarter-ring pipe fitting is provided on the side near the groove of the quarter-ring pipe fitting. The other end of the product core 209 is provided with a side-sliding demolding part 3 through the fixed template 102 and the moving template 203. A rotating demolding part 4 is also provided through the I-shaped base plate 201, passing through the bottom pin plate 206, the top pin plate 205, the moving template 203 and the moving mold insert 204 and placed at the center of the groove of the quarter-ring pipe fitting.

[0037] The I-beam base plate 201 is provided with a plurality of ejection through holes 210, and an ejection pad 211 fixedly connected to the bottom pin plate 206 is provided in each ejection through hole 210. The ejection mechanism of the injection can perform demolding operation by pushing the ejection pad 211.

[0038] The face pin plate 205 is provided with return rods 212 at its four corners, and a return spring 213 is sleeved on the outside of the return rods 212 and placed between the face pin plate 205 and the moving mold plate 203 for resetting the face pin plate 205 after ejection. The fixed mold plate 102 is provided with a guide sleeve 107 at its four corners, and the moving mold plate 203 is provided with a guide rod 214 at its four corners that can be inserted into the guide sleeve 107. Through the coordinated use of the guide sleeve 107 and the guide rod 214, the accuracy of the injection mold 1 and the injection mold 2 during mold closing is ensured.

[0039] The top surface of the I-beam base plate 201 is also provided with a plurality of ejection limiting pads 218, which are used to limit the use of the bottom pin plate 206.

[0040] The side-sliding demolding part 3 includes a downwardly extending inclined guide post 301 provided on the bottom surface of the fixed template 102, and a wedge block 302 provided on the outer side of the inclined guide post 301 on the bottom surface of the fixed template 102. The wedge block 302 also has a parallel inclined surface on its side near the inclined guide post 301. The side-sliding demolding part 3 also includes a side slider 303 provided on the top surface of the moving template 203. The side slider 303 has an inclined guide hole 304 that matches the inclined guide post 301, and its outer side has a surface that matches the wedge block 304. The inclined plane of 02 is parallel to the inclined plane; the side slider 303 moves along its axial direction through the horizontal guide slide provided on the moving template 203, and a reset rod 305 extending horizontally outward is provided on the rear side of the side slider 303. The reset rod 305 passes through the positioning block 306 provided on the top surface of the moving template 203. At the same time, a reset spring 307 is sleeved on the rear side of the positioning block 306 and locked at the end by a bolt; a side sliding short core 308 is provided on the side of the side slider 303 near the product core 209 and is tightly connected to it.

[0041] The rotary demolding part 4 includes a rotary hydraulic cylinder 401 mounted on the I-beam base plate 201. A drive rack 402 is connected to the shaft of the rotary hydraulic cylinder 401. The drive rack 402 is meshed with a transmission gear 403. The axis of the transmission gear 403 coincides with the center of the groove in the quarter-ring tube and is connected to a rotary shaft 404. The rotary shaft 404 sequentially passes through the bottom pin plate 206, the top pin plate 205, the moving template 203, and the moving mold insert 204. A reduced-diameter drive rotary column 405 is coaxially mounted at the top of the rotary shaft 404. The drive rotating column 405 has sliding keys 406 embedded on both sides, parallel to its axis, and a turntable sliding limit pad 407 on its top. A rotating disk 408 is sleeved on the outside of the drive rotating column 405 and the sliding keys 406. A rotating push plate 409 extends radially from the rotating disk 408. The rotating push plate 409 has a hollow circular hole and is sleeved on the outside of the product core 209. The bottom surface of the rotating disk 408 is connected to four rectangularly arranged demolding ejector pins 207, so that the rotating disk 408 can be moved up and down by the demolding ejector pins 207.

[0042] The fixed mold insert 103 and the moving mold insert 204 are respectively provided with a fixed mold water channel 108 and a moving mold water channel 215 near the groove of the quarter-ring pipe fitting. The fixed mold water channel 108 is provided with a water channel interface on the side of the fixed mold plate 102; the moving mold water channel 215 is provided with a water channel interface on the side of the moving mold plate 203; the square column 208 and the product core 209 are provided with a core water channel 217, and a water channel interface is provided on the outer surface of the square column 208; the side slider 303 and the side sliding short core 308 are provided with a short core water channel 309, and a water channel interface is provided on the outer surface of the side slider 303.

[0043] When using it, the following steps are included:

[0044] 1. Before the mold is opened, the injection fixed mold 1 and the injection moving mold 2 are pressed together by the mold closing structure of the injection machine, and the inclined surface of the side slide block 303 is contacted and wedged by the wedging block 302. At the same time, the side sliding short core 308 is also wedged by the wedging block 302 to resist the injection pressure acting on the product core 209 and the side sliding short core 308.

[0045] 2. When the mold opens, the injection mold 1 and the injection moving mold 2 separate. The inclined guide post 301 and the wedge block 302, which are fixed on the fixed template 102, move together with the side slider 303. At this time, as the inclined guide post 301 pushes, the side slider 303 is pulled out while the mold opens. As the mold opens, when the inclined guide post 301 is completely pulled out from the inclined guide hole 304, the side slider 303 is pulled out into position and fixed in place under the action of the positioning block 306 and the return spring 307. It can also automatically return to its original position under slight disturbance. At the same time, the side sliding short core 308 also separates from the product core 209. When the mold opens to the point where the product and runner can be smoothly removed from the mold parting surface, the mold opening stops.

[0046] 3. After the mold opening stops, under the control of the injection molding machine's control system, the ejection mechanism on the moving mold side of the injection molding machine operates. The ejector bar presses against the ejection pad 211, pushing the bottom pin plate 206 and the top pin plate 205. It also overcomes the clamping force of the return spring 213 to drive the upper demolding ejector pin 207, return rod 212, square column 208, product core 209, rotating disk 408, and the product and rotating demolding structure enclosed on it to eject the moving mold. As the ejection continues and reaches a suitable height, the product completely disengages from the moving mold and avoids the height of the side slide block 303, and then the ejection stops.

[0047] 4. After ejection stops, the injection molding machine's control system issues another command to control the solenoid valve of the rotary hydraulic cylinder 401 to perform a corresponding action, sending high-pressure hydraulic oil into the extension port of the rotary hydraulic cylinder 401. This causes the piston of the rotary hydraulic cylinder 401 to extend, driving the drive rack 402 to rotate through the meshing transmission gear 403, which in turn drives the rotating shaft 404 to rotate. This rotation is transmitted to the upper rotating disk 408, which drives the rotating push plate 409 fixed thereon. As rotation continues, the transmission gear 403 now contacts the product tightly compressed on the product core 209, pushing it to rotate and demold from the product core 209. After rotating to a suitable angle, the product is ejected from the product core 209. At the same time, the piston of the rotary hydraulic cylinder 401 extends to its limit and stops.

[0048] 5. When demolding is complete, the injection molding machine's control system timer also finishes timing simultaneously and issues a command to control the solenoid valve of the rotary hydraulic cylinder 401 to perform a corresponding action. High-pressure hydraulic oil is sent into the retractable oil port of the hydraulic cylinder, causing the hydraulic cylinder piston to retract. This drives the drive rack 402 to rotate through the meshing transmission gear 403, which in turn drives the rotating shaft to rotate. The rotation is transmitted to the upper rotating disk 408, which drives the rotating push plate 409 fixed on it. As rotation continues, the rotating push plate 409 rotates in the opposite direction, rotating back to its initial position. At the same time, the rotary hydraulic cylinder piston also retracts to its limit and stops. The injection molding machine's control system timer also finishes timing simultaneously and issues a command to control the solenoid valve of the hydraulic cylinder to perform a corresponding holding action. The high-pressure hydraulic oil neither reaches the extended oil port nor the retractable oil port, but remains stationary.

[0049] 6. At this point, the product has been removed from the mold, and the injection molding machine's ejection mechanism retracts and resets. The bottom pin plate 206, the top pin plate 205, and the ejector pins 207 and 212 on them will also reset under the force of the return spring 213. When the bottom pin plate 206 contacts the ejection limit pad 218, the product core 209 on it resets under the action of the square column 208. At the same time, the ejector pins 207 under the ejector rotary disk 408 also resets along with the bottom pin plate 206. After resetting, the mold can be closed again. As the mold closes, the inclined guide post 301 inserts into the corresponding inclined guide hole 304, pushing the side slider 303 forward and compressing the reset spring 307. When the inclined surface of the wedge block is wedge-tight with the inclined surface of the side slider 303, the moving and fixed molds are fully closed and an instruction is issued for the injection molding machine to start injecting molten plastic into the runner and cavity, entering the next working cycle.

[0050] Although embodiments of the present invention have been shown and described, it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, it will be understood by those skilled in the art that all other embodiments obtained by making various changes, modifications, substitutions and alterations to these embodiments without departing from the principles and spirit of the present invention and without creative effort are within the scope of protection of the present invention.

Claims

1. A mold for rotational demolding of a quarter ring pipe injection molded product, characterized by: The system includes a fixed injection mold (1) and a moving injection mold (2), with a rotating demolding part (4) and a side-sliding demolding part (3) provided between the two molds. The fixed injection mold (1) includes an I-beam panel (101) and a fixed template (102) arranged vertically. The bottom surface of the fixed template (102) is provided with an upwardly recessed groove and a fixed mold insert (103) is embedded therein. The bottom surface of the fixed mold insert (103) is provided with an upwardly recessed quarter-ring pipe fitting groove. The moving injection mold (2) includes an I-beam base plate (201) and a base plate protrusion (202) fixedly connected to the two long sides on its top surface. The top surface of the two base plate protrusions (202) is provided with a moving template (203) and a downwardly recessed groove is provided on its top surface and a moving mold insert (204) is embedded therein. The top surface of the moving template (203) and the moving mold insert (204) is provided with a downwardly recessed quarter-ring pipe fitting groove. A quarter-ring pipe fitting groove; a face pin plate (205) and a bottom pin plate (206) are arranged vertically between the two bottom plate protrusions (202), and a plurality of demolding ejector pins (207) are arranged on the face pin plate (205); a square post (208) penetrating the moving template (203) is arranged on one end of the face pin plate (205) in the quarter-ring pipe fitting groove, and a product core (209) is arranged on one side near the quarter-ring pipe fitting groove; the other end of the product core (209) is provided with a side-sliding demolding part (3) through the fixed template (102) and the moving template (203); a rotating demolding part (4) is also provided through the I-shaped bottom plate (201), penetrating the bottom pin plate (206), the face pin plate (205), the moving template (203) and the moving mold insert (204) and placed at the center of the quarter-ring pipe fitting groove.

2. The mold for rotational demolding of a quarter ring tube injected with a plastic according to claim 1, characterized in that: The side-sliding demolding part (3) includes a downwardly extending inclined guide post (301) and a wedge block (302) provided on the bottom surface of the fixed template (102). The wedge block (302) has an inclined surface parallel to the inclined guide post (301) on its side near the inclined guide post (301). A side slider (303) is provided on the top surface of the moving template (203) through a horizontal guide slide. The side slider (303) has an inclined guide hole (304) that matches the inclined guide post (301), and its outer side has a groove that matches the wedge block (302). The inclined plane is parallel to the inclined plane; a horizontally extending reset rod (305) is provided on the rear side of the side slider (303), the reset rod (305) passes through the positioning block (306) provided on the top surface of the moving template (203), the reset rod (305) is fitted with a reset spring (307) on the rear side of the positioning block (306) and is locked and fixed at the end by a bolt; a side sliding short core (308) is provided on the side of the side slider (303) near the product core (209) and is tightly connected to it.

3. The mold for rotational demolding of a quarter ring tube injected with a plastic according to claim 2, characterized in that: The rotary demolding part (4) includes a rotary hydraulic cylinder (401) mounted on the I-beam base plate (201) and a drive rack (402) connected to its shaft. The drive rack (402) is meshed with a transmission gear (403). The axis of the transmission gear (403) coincides with the center of the groove of the quarter-ring tube and is connected to a rotary shaft (404) that passes through the bottom pin plate (206), the face pin plate (205), the moving template (203), and the moving mold insert (204) in sequence. A diameter is coaxially provided at the top end of the rotary shaft (404). A reduced-size drive rotating column (405) is embedded on both sides with sliding keys (406) parallel to its axis, and a turntable sliding limit pad (407) is provided at the top. A rotating disk (408) is sleeved on the outside of the drive rotating column (405) and the sliding keys (406). A rotating push plate (409) extends radially from the rotating disk (408). The rotating push plate (409) is provided with a hollow circular hole and is sleeved on the outside of the product core (209). The bottom surface of the rotating disk (408) is connected to four rectangularly arranged demolding ejector pins (207).

4. The mold for rotational demolding of a quarter ring tube injected with a plastic according to claim 3, characterized in that: The fixed mold insert (103) and the moving mold insert (204) are respectively provided with a fixed mold water channel (108) and a moving mold water channel (215) near the groove of the quarter ring pipe. The fixed mold water channel (108) has a water channel interface on the side of the fixed mold plate (102). The moving mold water channel (215) has a water channel interface on the side of the moving mold plate (203). The square column (208) and the product core (209) are provided with a core water channel (217), and a water channel interface is provided on the outer side of the square column (208). The side slider (303) and the side sliding short core (308) are provided with a short core water channel (309), and a water channel interface is provided on the outer side of the side slider (303).

5. The rotational demolding mold for injection molding a quarter ring tube according to claim 4, characterized in that: A positioning ring (104) is provided at the center of the top surface of the I-beam panel (101), and a sprue runner (105) is provided at the center of the I-beam panel (101), the fixed template (102), and the fixed template insert (103) in sequence. A sprue sleeve (106) is provided around the sprue runner (105).

6. The rotational demolding mold for injection molding a quarter ring tube according to claim 5, characterized by: The I-shaped base plate (201) is provided with a plurality of ejection through holes (210), and an ejection pad (211) fixedly connected to the base pin plate (206) is provided in each ejection through hole (210).

7. The rotational demolding mold for injection molding a quarter ring tube according to claim 6, characterized by: The needle plate (205) is provided with return rods (212) at its four corners, and a return spring (213) is sleeved on the outside of the return rods (212) and placed between the needle plate (205) and the moving template (203); the fixed template (102) is provided with a guide sleeve (107) at its four corners, and the moving template (203) is provided with a guide rod (214) at its four corners that can be inserted into the guide sleeve (107).

8. The rotational demolding mold for injection molding a quarter ring tube according to claim 7, characterized by: The top surface of the I-beam base plate (201) is also provided with multiple ejection limiting pads (218).

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