One-mold four-cavity 90-degree bent pipe demolding equipment

Abstract

The utility model discloses one-mold four-cavity 90-degree elbow demolding equipment which comprises a demolding table used for placing a formed elbow and at least one set of demolding assembly, an elbow core is arranged on the demolding table, and the elbow is formed along the peripheral wall of the elbow core. The demolding assembly comprises a drawing device, a first demolding device arranged corresponding to one end of the bent pipe and a second demolding device arranged corresponding to the other end of the bent pipe, the second demolding device is rotationally connected with the demolding table through a shaft, and the drawing device drives the first demolding device to move in the direction close to or away from the bent pipe core; the first demolding device drives the second demolding device to move in the direction close to or away from the bent pipe core through the connecting rod, the drawing device is provided with a drawing extension section, and after the drawing device is drawn to the drawing extension section, the second demolding device can rotate along a shaft and enable the end, facing the demolding table, of the second demolding device to be separated from the demolding table. The demolding equipment is convenient to demold and is not easy to block the mold.

Description

One-mold four-cavity 90-degree bend pipe demolding equipment Technical Field

[0001] This utility model relates to the field of pipe bending demolding technology, specifically a 90-degree pipe bending demolding device with one mold and four cavities. Background Technology

[0002] As a key connector in water supply and drainage, HVAC, and automotive fields, the core challenge in the injection molding of 90-degree bends lies in demolding. Traditional 90-degree bend injection molds often employ a one-cavity or two-cavity structure, with demolding primarily achieved through inclined guide pillar slider core pulling, hydraulic direct core pulling, or internal retraction demolding methods. The inner core of the bend is often an integral structure, with core pulling operations completed through unidirectional linear motion or a simple rotation mechanism. When demolding multiple cavities simultaneously, the different wear levels in different cavities result in variations in the length of the bend formed in different cavities. Traditional rotary demolding strokes are fixed, identical to those of newly commissioned equipment, and unsuitable for long-term use. If the length of the bend formed in one cavity differs from the other three cavities, under the same demolding stroke, the longer bend may fail to demold smoothly, potentially causing equipment malfunction. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a four-cavity 90-degree bend demolding device to solve the problem mentioned in the background art that the traditional four-cavity demolding device gets stuck after wear and cannot demold bends of different lengths.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a demolding device for a 90-degree bent tube with a four-cavity mold, comprising a demolding platform for placing the formed bent tube and at least one set of demolding components. A bent tube core is disposed on the demolding platform, and the bent tube is formed along the outer circumferential wall of the bent tube core. The demolding components include a puller, a first demolding device disposed at one end of the bent tube, and a second demolding device disposed at the other end of the bent tube. One end of the first demolding device is detachably connected to the bent tube core, and the other end is connected to the puller. One end of the second demolding device is connected to the first demolding device via a connecting rod, and the other end is connected to the other end of the bent tube core. The ends are detachably connected. The connecting rod is rotatably connected to both the first demolding device and the second demolding device. The demolding table is provided with a shaft corresponding to the position of the second demolding device. The second demolding device is rotatably connected to the demolding table via the shaft. The puller drives the first demolding device to move closer to or away from the direction of the bent tube core. The first demolding device drives the second demolding device to move closer to or away from the direction of the bent tube core via the connecting rod. The puller is provided with a pull extension section. After the puller pulls to the pull extension section, the second demolding device can rotate along the shaft and cause the end of the second demolding device facing the demolding table to separate from the demolding table.

[0005] As a further improvement of this utility model, the demolding components are in two sets, with one set of demolding components corresponding to two adjacent holes in the four holes, and the two sets of demolding components are arranged opposite to each other. There are two pullers, with one puller corresponding to one set of demolding components.

[0006] As a further improvement of this utility model, a tie rod is provided between two adjacent second demolding devices for resetting the second demolding device. The tie rod is elastic, and its two ends are respectively fixedly connected to the two adjacent second demolding devices.

[0007] As a further improvement of this utility model, a forming groove is provided on the demolding table, the bent tube core is accommodated in the forming groove, and a limiting part is provided at the opening position of the forming groove facing the side wall of the demolding table. The limiting part is used to limit the first demolding device and the second demolding device to prevent the first demolding device and the second demolding device from excessively entering the forming groove when resetting.

[0008] As a further improvement of this utility model, the first demolding device is provided with a slot on the side facing the puller, the puller has a pull rod, and a locking connector is provided at the end of the pull rod facing the slot. The locking connector engages with the slot to pull the first demolding device along the length of the pull rod.

[0009] Compared with existing technologies, this utility model provides a four-cavity 90-degree bend demolding device with the following advantages: The device adopts a four-cavity layout, allowing simultaneous demolding of four formed bends, significantly improving production efficiency and solving the problem of low capacity in traditional single-cavity demolding equipment, thus meeting the needs of mass industrial production. Relying on the coordinated operation of the puller, first demolding device, second demolding device, and connecting rod, the puller can drive the second demolding device to rotate around its axis via the connecting rod, achieving synchronous separation of both ends of the bend. Furthermore, the puller extension section ensures stable separation of the second demolding device from the demolding table, guaranteeing smooth demolding and preventing jamming or adhesion between the bend and the mold core or demolding table after forming, effectively reducing the breakage rate after bend formation. Each demolding component adopts a detachable and rotatable connection structure, facilitating equipment assembly, maintenance, and component replacement. It is also adaptable to demolding operations of different specifications of 90-degree bends, improving the device's versatility and flexibility, and reducing equipment procurement and maintenance costs for manufacturing enterprises. Attached Figure Description

[0010] Figure 1 is a front view structural diagram of this utility model;

[0011] Figure 2 is a front view structural diagram of the demolding table of this utility model;

[0012] Figure 3 is an enlarged view of part A in Figure 1, which is part of the specification drawing of this utility model;

[0013] Figure 4 is a partial enlarged view of the axial position of this utility model.

[0014] Reference numerals: 1. Demolding table; 2. Cavity; 3. Demolding assembly; 4. Bending core; 5. Puller; 6. First demolding device; 7. Second demolding device; 8. Connecting rod; 9. Shaft; 10. Pulling extension section; 11. Tie rod; 12. Forming groove; 13. Limiting part; 14. Slot; 15. Tie rod; 16. Connecting joint. Detailed Implementation

[0015] As shown in the figure, to achieve the above-mentioned objective, this utility model provides a demolding device for a 290-degree bent tube with a four-cavity mold, including a demolding table 1 for placing the formed bent tube and at least one set of demolding components 3. A bent tube core 4 is provided on the demolding table 1, and the bent tube is formed along the outer peripheral wall of the bent tube core 4. The demolding components 3 include a puller 5, a first demolding device 6 corresponding to one end of the bent tube, and a second demolding device 7 corresponding to the other end of the bent tube. One end of the first demolding device 6 is detachably connected to the bent tube core 4, and the other end is connected to the puller 5. One end of the second demolding device 7 is connected to the first demolding device 6 via a connecting rod 8, and the other end is connected to the bent tube core 4. The other end is detachably connected. The connecting rod 8 is rotatably connected to both the first demolding device and the second demolding device 7. The demolding table 1 is provided with a shaft 9 corresponding to the position of the second demolding device 7. The second demolding device 7 is rotatably connected to the demolding table 1 through the shaft 9. The puller 5 drives the first demolding device 6 to move closer to or away from the bent tube core 4. The first demolding device 6 drives the second demolding device 7 to move closer to or away from the bent tube core 4 through the connecting rod 8. The puller 5 is provided with a pull extension section 10. After the puller 5 pulls to the pull extension section 10, the second demolding device 7 can rotate along the shaft 9 and separate the end of the second demolding device 7 facing the demolding table 1 from the demolding table 1.

[0016] In this implementation, a bent tube core 4 is installed on the platform corresponding to each cavity 2. The outer contour of the bent tube core 4 matches the inner wall contour of the 90-degree bend. After molding, the bend and the bent tube core 4 are in close contact and need to be separated by the demolding assembly 3. The demolding assembly 3 includes a puller 5, a first demolding device 6, and a second demolding device 7. The end of the first demolding device 6 closest to the bent tube core 4 is detachably connected to the bent tube core 4. The first demolding device 6 and the bent tube core 4 are connected by a plug-in connection. The end of the first demolding device 6 furthest from the bent tube core 4 is fixedly connected to the puller 5. One end of the second demolding device 7 is connected to the first demolding device 6 via a connecting rod 8. The two ends of the connecting rod 8 are respectively connected to the first demolding device 6 and the second demolding device 7 by pins 9. A small gap can be reserved at the connection to ensure smooth rotation without jamming. A shaft 9 is fixedly installed on the demolding platform 1 corresponding to the position of the second demolding device 7. The second demolding device 7 is sleeved on the outside of the shaft 9, forming a rotatable fit with the demolding platform 1. The puller 5 is a linear drive component that can drive the first demolding device 6 to move closer to or away from the bent tube core 4 in a straight line. During the displacement of the first demolding device 6, it is synchronously driven by the connecting rod 8, which drives the second demolding device 7 to move closer to or away from the bent tube core 4. The puller 5 body has a preset pull extension section 10, which is an extension section of the pull stroke. When the puller 5 pulls the first demolding device 6 to the position of the pull extension section 10, the connecting rod 8 can continue to pull the second demolding device 7 to move. At this time, the second demolding device 7 deflects around the shaft 9 of the demolding table 1, and its bottom end facing the demolding table 1 is completely separated from the table surface of the demolding table 1, switching to a posture that facilitates the release of the bent tube.

[0017] As an improved specific implementation, there are two sets of demolding components 3, with one set of demolding components 3 corresponding to two adjacent holes 2 in the four holes 2, and the two sets of demolding components 3 are arranged opposite to each other. There are two pullers 5, with one puller 5 corresponding to one set of demolding components 3.

[0018] In implementation, the demolding table 1 has four independent forming stations corresponding to the four bent tube cores 4. The four stations are arranged symmetrically in pairs. Two sets of demolding components 3 are set, and the two sets of components are arranged symmetrically with the longitudinal central axis 9 of the demolding table 1 as the reference. One set of demolding components 3 is set for two adjacent forming stations in the four cavities 2, covering the bent tube cores 4 and the formed bent tubes in these two stations, and can complete the demolding action of the two bent tubes simultaneously. The other set of demolding components 3 is set for the remaining two adjacent forming stations, symmetrical with the first set of components, to meet the production requirements of simultaneous forming of the four cavities 2. Two pullers 5 are set, and each puller 5 is independently matched with a set of demolding components 3, and drives the first demolder 6 in the corresponding set to perform the pulling action. The two sets of pullers 5 can be started synchronously through synchronous control to ensure the simultaneous demolding of the bent tubes of the four cavities 2. They can also be started in stages according to actual production needs to achieve step-by-step demolding. Two sets of oppositely arranged demolding components 3, during the pulling process of the puller 5, each drive the corresponding second demolding device 7 through the connecting rod 8 to complete the displacement and rotation action. The demolding components of adjacent stations do not contact or interfere with each other.

[0019] As an improved specific embodiment, a tie rod 11 for resetting the second demolding device 7 is provided between two adjacent second demolding devices 7. The tie rod 11 is elastic, and its two ends are fixedly connected to the two adjacent second demolding devices 7 respectively.

[0020] In implementation, this solution involves setting up elastic reinforcing bars 11 between two adjacent second demolding units 7 in the two sets of demolding components 3. The reinforcing bars 11 are elastic components with self-rebound capability, and their two ends are fixedly connected to the two adjacent second demolding units 7 respectively. The elastic reinforcing bars 11 can be made of rubber elastic reinforcing bars 11, using high wear-resistant and high-resilience industrial rubber material. Metal connecting pieces are pre-embedded at both ends of the reinforcing bars 11, and they are fixed to the outer side walls of the adjacent second demolding units 7 respectively by fastening bolts, ensuring a firm connection and stable elastic deformation. Alternatively, metal spring reinforcing bars 11 can be used, using stainless steel compression springs. Hooks are integrally set at both ends of the springs, and corresponding hanging posts are welded to the outer side walls of the second demolding units 7. The springs are directly hung on the hanging posts through the hooks, making disassembly and assembly convenient and the elastic force adjustable. After installation, the tie rod 11 is always in a slightly stretched, stored state. When the puller 5 drives the second demolding device 7 to rotate around the shaft 9 and completes the demolding of the bent pipe, the puller 5 reverses and resets, causing the first demolding device 6 to move back to its initial position. At this time, the elastic tie rod 11, relying on its own elastic recoil force, synchronously pulls the two adjacent second demolding devices 7 back to their initial positions for precise reset, avoiding the problem of reset offset or jamming of the second demolding devices 7 due to transmission gaps or inertia. The tie rod 11 only connects to the adjacent second demolding devices 7 and is not connected to other components such as the demolding table 1 or the bent pipe core 4.

[0021] As an improved specific embodiment, a molding groove 12 is provided on the demolding table 1, and the bent tube core 4 is accommodated in the molding groove 12. A limiting part 13 is provided at the opening position of the molding groove 12 facing the side wall of the demolding table 1. The limiting part 13 is used to limit the first demolding device 6 and the second demolding device 7 to prevent the first demolding device 6 and the second demolding device 7 from excessively entering the molding groove 12 when resetting.

[0022] When implementing this solution, the surface of the demolding table 1 is provided with an independent forming groove 12 corresponding to each bent tube core 4. The outer contour of the forming groove 12 matches the outer wall contour of the 90-degree bent tube. The bent tube core 4 is completely housed inside the forming groove 12. During the bending process, it is filled in the gap between the forming groove 12 and the bent tube core 4, effectively ensuring the dimensional accuracy of the bent tube. A limiting part 13 is provided at the opening end of the forming groove 12 facing the side wall of the demolding table 1. The limiting part 13 is used for the reset limiting of the first demolding device 6 and the second demolding device 7. This solution adopts an integrated boss limiting part 13, which is integrally cast with the table surface of the demolding table 1. The boss extends continuously along the edge of the opening of the forming groove 12. The height of the boss is slightly higher than the bottom surface of the forming groove 12, so as not to hinder the bending forming and the normal operation of the demolding device. When the elastic tie 11 drives the first demolding device 6 and the second demolding device 7 to reset, the limiting part 13 directly abuts against the end of the demolding device, accurately limiting its reset stroke, avoiding the first demolding device 6 and the second demolding device 7 from excessively extending into the forming groove 12 due to the excessive elastic tension of the tie 11, squeezing the bent core 4 or the already formed bent blank, and at the same time preventing the demolding device from hitting and damaging the inner wall of the forming groove 12 when resetting.

[0023] As an improved specific embodiment, the first demolding device 6 is provided with a slot 14 on the side facing the puller 5. The puller 5 has a pull rod 15, and a snap connector 16 is provided at the end of the pull rod 15 facing the slot 14. The snap connector 16 engages with the slot 14 to pull the first demolding device 6 along the length direction of the pull rod 15.

[0024] In this solution, a dedicated slot 14 is opened on the side end of the first demolding device 6 facing the puller 5. The puller 5 includes a core transmission component, a pull rod 15, which is a rigid rod extending in a straight line. A snap-fit ​​connector 16 is integrally machined at the end facing the first demolding device 6. The snap-fit ​​connector 16 and the slot 14 form a detachable snap-fit ​​engagement, realizing direct transmission between the pull rod 15 and the first demolding device 6. This solution can adopt a rectangular slot 14 and a rectangular snap-fit ​​connector 16. The snap-fit ​​connector 16 is directly embedded horizontally into the slot 14, with its side fitting against the inner wall of the slot 14, ensuring no shaking or offset during the straight pulling process. This snap-fit ​​structure eliminates the need for additional fasteners such as bolts and nuts. During assembly, the snap-fit ​​connector 16 can be directly pushed into the slot 14 to complete a stable connection. During disassembly, the snap-fit ​​connector 16 can be quickly separated by sliding it horizontally. This method has high disassembly and assembly efficiency and facilitates equipment maintenance and component replacement. After the puller 5 is started, the pull rod 15 transmits the linear driving force directly to the first demolding device 6 through the tight fit between the snap connector 16 and the slot 14, causing it to reciprocate linearly along the length of the pull rod 15. The power transmission is lossless and the pulling stroke is controllable.

[0025] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are within its protection scope. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within its protection scope.

Claims

1. A demolding device for a 90-degree bent pipe with a four-cavity mold, characterized in that, The system includes a demolding table for placing a formed bent tube and at least one demolding assembly. A bent tube core is disposed on the demolding table, and the bent tube is formed along the outer peripheral wall of the bent tube core. The demolding assembly includes a puller, a first demolding device corresponding to one end of the bent tube, and a second demolding device corresponding to the other end of the bent tube. One end of the first demolding device is detachably connected to the bent tube core, and the other end is connected to the puller. One end of the second demolding device is connected to the first demolding device via a connecting rod, and the other end is detachably connected to the other end of the bent tube core. The connecting rod connects to the first demolding device and the second demolding device. All the molds are rotatably connected. The demolding table is provided with a shaft corresponding to the position of the second demolding device. The second demolding device and the demolding table are rotatably connected by the shaft. The puller drives the first demolding device to move closer to or away from the direction of the bent tube core. The first demolding device drives the second demolding device to move closer to or away from the direction of the bent tube core through a connecting rod. The puller is provided with a pull extension section. After the puller pulls to the pull extension section, the second demolding device can rotate along the shaft and cause the end of the second demolding device facing the demolding table to separate from the demolding table.

2. The four-cavity 90-degree elbow demolding apparatus of claim 1, wherein, The demolding components are in two sets, with one set corresponding to two adjacent holes in the four holes. The two sets of demolding components are arranged opposite to each other. There are two pullers, with one puller corresponding to one set of demolding components.

3. The four-cavity 90-degree elbow demolding apparatus of claim 2, wherein, A tie rod is provided between two adjacent second demolding devices to reset the second demolding devices. The tie rod is elastic and its two ends are fixedly connected to the two adjacent second demolding devices respectively.

4. The four-cavity 90-degree elbow demolding apparatus of claim 3, wherein, The demolding table is provided with a forming groove, and the bent tube core is housed in the forming groove. The opening of the forming groove facing the side wall of the demolding table is provided with a limiting part. The limiting part is used to limit the first demolding device and the second demolding device to prevent the first demolding device and the second demolding device from excessively entering the forming groove when resetting.

5. The demolding device for a four-cavity 90-degree bent pipe according to claim 1, characterized in that, The first demolding device has a slot on the side facing the puller. The puller has a pull rod, and a locking connector is provided at the end of the pull rod facing the slot. The locking connector engages with the slot to pull the first demolding device along the length of the pull rod.

Images