Seamless polyethylene elbow forming device

Abstract

The invention relates to the technical field of polyethylene product processing, in particular to a seamless polyethylene elbow forming device which comprises a box body, a supporting frame is fixedly connected to the top of the box body, an opening and closing component is installed on the supporting frame, a mounting rod is arranged on the upper portion of the opening and closing component, and an upper mold is fixedly connected to the bottom of the mounting rod. The top of the box body is fixedly connected with a lower mold matched with the upper mold, the top of the upper mold communicates with an injection pipe, and a forming cavity is jointly formed in the upper mold and the lower mold. Through mutual cooperation of a lower guide pipe, a lower spiral guide groove, a lower vertical guide groove, a lower guide column, an upper guide pipe, an upper spiral guide groove, an upper vertical guide groove and an upper guide column, it is ensured that the first arc-shaped mold core and the second arc-shaped mold core can be smoothly separated from a formed polyethylene elbow; and meanwhile, in the upward moving process of the internal thread sleeve, the upper mold can move upwards, and the distance between the lower mold and the upper mold can meet the requirement for taking out the polyethylene elbow.

Description

Technical Field

[0001] The present invention relates to the technical field of polyethylene product processing, and particularly relates to a seamless polyethylene elbow forming device. Background Art

[0002] In the field of polyethylene product processing, the arc-shaped polyethylene elbow is a key pipe fitting in the plastic product processing field. With its unique structure and performance advantages, it is widely used in many industries. It can flexibly change the flow direction of fluids or lines and achieve smooth connection. It is widely used in many industries such as building water supply and drainage, chemical pipeline transportation, etc. With the continuous growth of the demand for polyethylene elbows in various industries, the requirements for their processing and forming quality and production efficiency are also increasing day by day. However, there are many problems in the actual application of a traditional seamless polyethylene elbow forming device, which are as follows:

[0003] After the traditional forming device forms the polyethylene elbow, the demoulding method of the internal mold core is relatively simple and rough. Often, manual operation or the help of some simple tools is required to forcibly pull out the mold core from the formed polyethylene elbow. This demoulding method is not only inefficient but also laborious to operate; after the polyethylene elbow is cooled and formed, there are also inconveniences in the process of taking it out of the mold. Some molds do not have a special ejection mechanism, and the operator needs to laboriously pick out or pry out the product from the mold, which not only consumes time and manpower but also may cause secondary damage to the product; during the injection molding process, if the air in the forming cavity cannot be effectively discharged, it will be incorporated into the molten polyethylene, which will cause bubbles and void defects inside the polyethylene elbow, greatly reducing the strength and tightness of the polyethylene elbow, thus reducing the quality of the formed polyethylene elbow.

[0004] Therefore, it is necessary to provide a seamless polyethylene elbow forming device to solve the above technical problems. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention provides the following technical solutions:

[0006] A seamless polyethylene elbow forming device, comprising a box body, a support frame is fixedly connected to the top of the box body, an opening and closing component is installed on the support frame, an installation rod is arranged on the upper part of the opening and closing component, a upper mold is fixedly connected to the bottom of the installation rod, a lower mold adapted to the upper mold is fixedly connected to the top of the box body, an injection pipe is communicated with the top of the upper mold, and a forming cavity is jointly arranged in the upper mold and the lower mold; a first arc-shaped mold core and a second arc-shaped mold core are symmetrically arranged in the forming cavity; the opening and closing component comprises a driving component, a first opening component and a second opening component; the first opening component is used for driving the second arc-shaped mold core to move out of the forming cavity, the second opening component is used for driving the first arc-shaped mold core to move out of the forming cavity, and the driving component is used for driving the first opening component and the second opening component to move simultaneously; an air extraction component is arranged on the lower mold; a ejecting component is also arranged on the lower mold.

[0007] As an improvement of the above technical solution, the driving component comprises a motor, the motor is fixedly connected to the inner bottom of the box body, a vertical threaded rod is fixedly connected to the rotating end of the motor, the vertical threaded rod is rotatably connected to the inner side of the box body, an internal threaded sleeve is longitudinally and slidably connected through the upper part of the box body, and the vertical threaded rod extends into the internal threaded sleeve and is threadedly connected thereto.

[0008] As an improvement of the above technical solution, the first opening component comprises a lower guide pipe, the lower guide pipe is movably sleeved on the outer side of the internal threaded sleeve, the lower guide pipe is rotatably connected to the support frame, a lower spiral guide groove and a lower vertical guide groove are longitudinally penetrated and opened on the side wall of the lower guide pipe, the top end of the lower spiral guide groove is communicated with the bottom end of the lower vertical guide groove, a lower guide post is fixedly connected to the outer side wall of the internal threaded sleeve, the lower guide post is arranged in the lower spiral guide groove, a lower fixed rod is fixedly connected to the outer side wall of the lower guide pipe, and one end of the lower fixed rod is fixedly connected to a first sealing disc, and one side of the first sealing disc is fixedly connected to one end of the second arc-shaped mold core.

[0009] As an improvement of the above technical solution, the second opening component comprises an upper guide pipe, the upper guide pipe is movably sleeved on the outer side of the internal threaded sleeve, the upper guide pipe is rotatably connected to the support frame, an upper spiral guide groove and an upper vertical guide groove are longitudinally penetrated and opened on the side wall of the upper guide pipe, the top end of the upper spiral guide groove is communicated with the bottom end of the upper vertical guide groove, an upper guide post is fixedly connected to the outer side of the internal threaded sleeve, the upper guide post extends into the upper spiral guide groove, an upper fixed rod is fixedly connected to the outer side of the upper guide pipe, and one end of the upper fixed rod is fixedly connected to a second sealing disc, and one side of the second sealing disc is fixedly connected to one end of the first arc-shaped mold core.

[0010] As an improvement of the above technical solution, the air extraction component includes an air extraction cavity, which is formed in the lower mold. A communication hole communicating with the air extraction cavity is formed through the lower mold. A blocking block is slidably arranged in the communication hole. One end of the blocking block extends into the air extraction cavity and is fixedly connected with a connecting rod. The other end of the blocking block is flush with the inner side of the lower mold. An electric cylinder is fixedly connected through the lower mold. The telescopic end of the electric cylinder extends into the air extraction cavity and is fixedly connected with one side of the connecting rod.

[0011] As an improvement of the above technical solution, an air extraction pump is fixedly installed in the box body. The air inlet end of the air extraction pump is communicated with a communication pipe. One end of the communication pipe passes through the lower mold and is communicated with the air extraction cavity.

[0012] As an improvement of the above technical solution, the ejection component includes a jacking rod. One end of the jacking rod is fixedly connected with the lower part of the outer side of the internal thread sleeve. Two receiving grooves are symmetrically formed in the inner side of the lower mold. Arc-shaped ejection support plates are arranged in the two receiving grooves. The lower surfaces of the arc-shaped ejection support plates are fixedly connected with vertical sliding rods. The vertical sliding rods longitudinally penetrate and are slidably connected to the lower mold. The bottom ends of the two vertical sliding rods are fixedly connected with a cross plate.

[0013] As an improvement of the above technical solution, a spring is sleeved on the outer side of the vertical sliding rod. The top end of the spring is fixedly connected with the bottom of the lower mold. The bottom end of the spring is fixedly connected with the top of the cross plate. The cross plate is arranged directly above the other end of the jacking rod.

[0014] The beneficial effects of the present invention:

[0015] By driving the vertical threaded rod to rotate by the motor, the internal thread sleeve threaded with it moves upward. Through the mutual cooperation of the lower guide pipe, the lower spiral guide groove, the lower vertical guide groove, the lower guide post, the upper guide pipe, the upper spiral guide groove, the upper vertical guide groove and the upper guide post, when the internal thread sleeve rises, the first arc-shaped die core and the second arc-shaped die core can rotate in opposite directions and smoothly move out of the forming cavity, ensuring that the first arc-shaped die core and the second arc-shaped die core can smoothly separate from the formed polyethylene elbow. At the same time, when the internal thread sleeve moves upward, the upper mold can be moved upward, so that the distance between the lower mold and the upper mold can meet the requirement for taking out the polyethylene elbow. By the upward movement of the internal thread sleeve, the rapid opening of the upper mold is realized, making the whole production process more efficient and smooth, thereby improving the taking-out efficiency of the polyethylene elbow and being more labor-saving.

[0016] The jacking rod is connected to the internal thread sleeve. As the internal thread sleeve rises under the action of the opening and closing component, the jacking rod moves synchronously. When the jacking rod contacts and pushes the cross plate upward, the vertical sliding rod connected to the cross plate drives the arc-shaped ejecting support plate to rise synchronously. The spring plays a role in buffering and assisting in resetting during this process. The arc-shaped ejecting support plate is adapted to the shape of the polyethylene elbow and can evenly apply an upward force to the elbow, smoothly ejecting the cooled and formed polyethylene elbow from the lower mold, so that the operator can more conveniently and quickly remove the formed polyethylene elbow.

[0017] 3. By setting the air extraction component, the air extraction cavity, the communication hole, the plugging block, the electric cylinder, the air extraction pump and the connecting rod cooperate with each other to extract the air in the forming cavity before injection molding, prevent the air from mixing into the molten polyethylene, effectively avoid the defects of bubbles and voids inside the polyethylene elbow, and improve the forming quality of the polyethylene elbow. Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the overall structure of a seamless polyethylene elbow forming device provided by the present invention;

[0019] Figure 2 It is a cross-sectional view of the overall structure of a seamless polyethylene elbow forming device in the present invention;

[0020] Figure 3 It is a schematic diagram of the structure at the opening and closing component in the present invention;

[0021] Figure 4 It is a schematic diagram of the structure at the opening and closing component from another perspective in the present invention;

[0022] Figure 5 It is a schematic diagram of the structure at the lower mold in the present invention;

[0023] Figure 6 It is a schematic diagram of the structure at the upper mold in the present invention;

[0024] Figure 7 It is a schematic diagram of the structure at the plugging block in the present invention;

[0025] Figure 8 It is a schematic diagram of the structure at the ejecting component in the present invention;

[0026] Figure 9 It is a schematic diagram of the structure at the cross plate in the present invention.

[0027] Reference numerals: 1, box body; 2, support frame; 3, opening and closing member; 31, driving member; 311, motor; 312, vertical threaded rod; 313, internal thread sleeve; 32, first opening assembly; 321, lower guide tube; 322, lower fixing rod; 323, first plugging disc; 324, lower spiral guide groove; 325, lower vertical guide groove; 326, lower guide post; 33, second opening assembly; 331, upper guide tube; 332, upper fixing rod; 333, second plugging disc; 334, upper spiral guide groove; 335, upper vertical guide groove; 336, upper guide post; 4, mounting rod; 5, injection tube; 6, upper mold; 7, lower mold; 8, air extraction member; 811, air extraction cavity; 812, connecting pipe; 813, plugging block; 814, electric cylinder; 815, air extraction pump; 816, connecting rod; 817, communication hole; 9, first arc-shaped mold core; 10, second arc-shaped mold core; 11, forming cavity; 12, ejecting member; 1211, jacking rod; 1212, cross plate; 1213, vertical sliding rod; 1214, spring; 1215, arc-shaped ejecting support plate; 1216, accommodating groove. Detailed implementation manners

[0028] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] Embodiment 1

[0030] Please refer to Figures 1 to 6 , a seamless polyethylene elbow forming device, including a box body 1, a support frame 2 is fixedly connected to the top of the box body 1, an opening and closing member 3 is installed on the support frame 2, an installation rod 4 is arranged on the upper part of the opening and closing member 3, the bottom of the installation rod 4 is fixedly connected to an upper mold 6, a lower mold 7 adapted to the upper mold 6 is fixedly connected to the top of the box body 1, an injection tube 5 is communicated with the top of the upper mold 6, and a forming cavity 11 is jointly arranged in the upper mold 6 and the lower mold 7; a first arc-shaped mold core 9 and a second arc-shaped mold core 10 are symmetrically arranged in the forming cavity 11; the opening and closing member 3 includes a driving member 31, a first opening assembly 32 and a second opening assembly 33; the first opening assembly 32 is used to drive the second arc-shaped mold core 10 to move out of the forming cavity 11, the second opening assembly 33 is used to drive the first arc-shaped mold core 9 to move out of the forming cavity 11, and the driving member 31 is used to drive the first opening assembly 32 and the second opening assembly 33 to move simultaneously; an air extraction member 8 is arranged on the lower mold 7; an ejecting member 12 is also arranged on the lower mold 7.

[0031] Further, the driving component 31 includes a motor 311, the motor 311 is fixedly connected to the inner bottom of the box body 1, the rotating end of the motor 311 is fixedly connected with a vertical threaded rod 312, the vertical threaded rod 312 is rotatably connected to the inside of the box body 1, the upper part of the box body 1 is longitudinally penetrated and slidably connected with an internally threaded sleeve 313, and the vertical threaded rod 312 extends into the internally threaded sleeve 313 and is threadedly connected thereto.

[0032] Further, the first opening assembly 32 includes a lower guide tube 321, the lower guide tube 321 is movably sleeved outside the internally threaded sleeve 313, the lower guide tube 321 is rotatably connected to the support frame 2, a lower spiral guide groove 324 and a lower vertical guide groove 325 are longitudinally penetrated through the side wall of the lower guide tube 321, the top end of the lower spiral guide groove 324 is communicated with the bottom end of the lower vertical guide groove 325, a lower guide post 326 is fixedly connected to the outer side wall of the internally threaded sleeve 313, the lower guide post 326 is arranged in the lower spiral guide groove 324, a lower fixed rod 322 is fixedly connected to the outer side wall of the lower guide tube 321, one end of the lower fixed rod 322 is fixedly connected with a first plugging disc 323, and one side of the first plugging disc 323 is fixedly connected with one end of the second arc-shaped die core 10.

[0033] Further, the second opening assembly 33 includes an upper guide tube 331, the upper guide tube 331 is movably sleeved outside the internally threaded sleeve 313, the upper guide tube 331 is rotatably connected to the support frame 2, an upper spiral guide groove 334 and an upper vertical guide groove 335 are longitudinally penetrated through the side wall of the upper guide tube 331, the top end of the upper spiral guide groove 334 is communicated with the bottom end of the upper vertical guide groove 335, an upper guide post 336 is fixedly connected to the outside of the internally threaded sleeve 313, the upper guide post 336 extends into the upper spiral guide groove 334, an upper fixed rod 332 is fixedly connected to the outside of the upper guide tube 331, one end of the upper fixed rod 332 is fixedly connected with a second plugging disc 333, and one side of the second plugging disc 333 is fixedly connected with one end of the first arc-shaped die core 9.

[0034] Further, the motor 311 is electrically connected to an external switch through a wire, and the spiral directions of the lower spiral guide groove 324 and the upper spiral guide groove 334 are opposite.

[0035] In the above, the motor 311 drives the vertical threaded rod 312 to rotate clockwise or counterclockwise. Since the vertical threaded rod 312 and the internally threaded sleeve 313 are in threaded fit, and the internally threaded sleeve 313 is restricted to only move vertically in the longitudinal chute of the box body 1, according to the characteristics of screw drive, the rotational movement of the vertical threaded rod 312 is converted into the precise vertical linear movement of the internally threaded sleeve 313.

[0036] As described above, when the internal thread sleeve 313 starts to move upward, the lower guide post 326 installed on its outer wall rises synchronously. At this time, the lower guide post 326 is located in the lower spiral guide groove 324 of the lower guide tube 321. The special spiral structure of the lower spiral guide groove 324 determines the movement trajectory of the lower guide post 326. As the lower guide post 326 climbs upward along the lower spiral guide groove 324, the vertical movement of the lower guide post 326, under the constraint of the lower spiral guide groove 324, causes the lower guide tube 321 to rotate around its own axis. When the lower guide tube 321 rotates, the lower fixed rod 322 fixed on its outer wall also rotates together, thereby driving the first sealing plate 323 to rotate. Eventually, the second arc-shaped mold core 10 fixedly connected to the first sealing plate 323 is removed from the molding cavity 11 in a specific rotation manner. Similarly, the upper guide post 336 rises with the internal thread sleeve 313 and moves in the upper spiral guide groove 334. The upper spiral guide groove 334 has a reverse helix direction compared to the lower spiral guide groove 324. This causes the movement of the upper guide post 336 to prompt the upper guide tube 331 to rotate in the opposite direction to the lower guide tube 321. The rotation of the upper guide tube 331 drives the upper fixed rod 332 and the second sealing plate 333 to rotate, so that the first arc-shaped mold core 9 rotates and is removed from the molding cavity 11 in the opposite direction to the second arc-shaped mold core 10, realizing the synchronous and reverse rotation demolding of the first arc-shaped mold core 9 and the second arc-shaped mold core 10, greatly improving the demolding efficiency and stability, and ensuring that the polyethylene elbow will not be deformed or damaged due to uneven stress during the demolding process.

[0037] Embodiment 2

[0038] Further, referring to Figures 1 to 7 , on the basis of Embodiment 1, the air extraction component 8 includes an air extraction chamber 811 opened on the lower mold 7. A communication hole 817 communicating with the air extraction chamber 811 is penetrated and opened on the lower mold 7. A plugging block 813 is slidably arranged in the communication hole 817. One end of the plugging block 813 extends into the air extraction chamber 811 and is fixedly connected with a connecting rod 816. The other end of the plugging block 813 is flush with the inner side of the lower mold 7. An electric cylinder 814 is fixedly penetrated and connected to the lower mold 7. The telescopic end of the electric cylinder 814 extends into the air extraction chamber 811 and is fixedly connected with one side of the connecting rod 816.

[0039] Further, an air extraction pump 815 is fixedly installed in the box body 1. The air inlet end of the air extraction pump 815 is communicated with a communication pipe 812. One end of the communication pipe 812 passes through the lower mold 7 and is communicated with the air extraction chamber 811.

[0040] Further, both the electric cylinder 814 and the air extraction pump 815 are electrically connected to an external switch through wires.

[0041] In the above description, when the telescopic end of the electric cylinder 814 contracts, the connecting rod 816 is used to pull the plugging block 813. The plugging block 813 was originally closely attached to the communication hole 817. Under the pulling force of the connecting rod 816, the plugging block 813 gradually moves into the air extraction cavity 811, and the communication hole 817 is opened. The channel between the molding cavity 11 and the air extraction cavity 811 is opened. The air extraction pump 815 works. Due to the pressure difference, the air in the molding cavity 11 will sequentially pass through the communication hole 817, the air extraction cavity 811, and then be sucked into the air extraction pump 815 through the connecting pipe 812, and finally discharged from the air outlet end of the air extraction pump 815, so as to achieve the purpose of extracting the air in the molding cavity 11. When the air extraction is completed and the predetermined vacuum degree is reached, the telescopic end of the electric cylinder 814 extends, pushing the connecting rod 816 to drive the plugging block 813 to move back towards the communication hole 817 until the plugging block 813 tightly blocks the communication hole 817 again, preventing the high-temperature and high-pressure molten polyethylene from entering the communication hole 817 during the subsequent injection molding process, creating good conditions for the high-quality molding of the polyethylene elbow.

[0042] Embodiment Three

[0043] Further, referring to Figures 1 to 9 , on the basis of Embodiment Two, the ejecting member 12 includes a jacking rod 1211. One end of the jacking rod 1211 is fixedly connected to the lower outer side of the internal thread sleeve 313. Two receiving grooves 1216 are symmetrically opened on the inner side of the lower mold 7. Arc-shaped ejecting support plates 1215 are arranged in both of the two receiving grooves 1216. Vertical sliding rods 1213 are fixedly connected to the lower surfaces of the arc-shaped ejecting support plates 1215. The vertical sliding rods 1213 longitudinally penetrate and are slidably connected to the lower mold 7. The bottoms of the two vertical sliding rods 1213 are jointly fixedly connected to a cross plate 1212.

[0044] Further, a spring 1214 is sleeved on the outer side of the vertical sliding rod 1213. The top end of the spring 1214 is fixedly connected to the bottom of the lower mold 7, and the bottom end of the spring 1214 is fixedly connected to the top of the cross plate 1212. The cross plate 1212 is arranged directly above the other end of the jacking rod 1211.

[0045] As described above, as the internal thread sleeve 313 continuously moves upward driven by the motor 311, the jacking rod 1211 fixedly connected to the lower part of the outer side of the internal thread sleeve 313 also climbs upward synchronously. At the initial stage of the rise of the jacking rod 1211, since its height has not reached the position of the cross plate 1212, the ejecting member 12 is in a standby state at this time. When the internal thread sleeve 313 rises to a certain height and the jacking rod 1211 contacts the bottom of the cross plate 1212, as the internal thread sleeve 313 continues to rise, the jacking rod 1211 begins to apply an upward thrust to the cross plate 1212. The cross plate 1212 moves upward under the thrust of the jacking rod 1211. The upward movement of the cross plate 1212 drives the vertical sliding rod 1213 to move upward synchronously. During the upward movement of the vertical sliding rod 1213, the spring 1214 is compressed and begins to store elastic potential energy. On the one hand, the spring 1214 can buffer the instantaneous impact force of the jacking rod 1211 on the cross plate 1212, avoiding damage to the polyethylene elbow due to excessive jacking force; on the other hand, after the subsequent polyethylene elbow is taken out, the elastic potential energy stored in the spring 1214 can help the cross plate 1212, the vertical sliding rod 1213 and the arc-shaped ejecting support plate 1215 to automatically reset, preparing for the next ejecting operation of injection molding. As the arc-shaped ejecting support plate 1215 rises, the polyethylene elbow is gradually ejected from the lower mold 7 until the polyethylene elbow completely disengages from the lower mold 7 and moves to a position convenient for the operator to pick up and place.

[0046] The working principle of a seamless polyethylene elbow forming device provided by the present invention is as follows:

[0047] During specific use, the injection pipe 5 is connected to an external molten polyethylene extrusion device through a pipeline. The electric cylinder 814 is started. The telescopic end of the electric cylinder 814 contracts to drive the connecting rod 816 to move the blocking block 813 into the air extraction cavity 811. The blocking block 813 no longer blocks the communication hole 817. Then the air extraction pump 815 is started. The air in the forming cavity 11 is sequentially extracted through the communication hole 817, the air extraction cavity 811 and the connecting pipe 812 by the operation of the air extraction pump 815 and discharged through the air outlet end of the air extraction pump 815, preventing air from affecting the molten polyethylene in the forming cavity 11. After the air extraction is completed, the telescopic end of the electric cylinder 814 is extended to drive the connecting rod 816 to drive the blocking block 813 into the communication hole 817 for blocking. Then the molten polyethylene is extruded into the forming cavity 11 in the upper mold 6 and the lower mold 7 through the injection pipe 5 by an external extrusion device. Due to the cooperation of the first arc-shaped die core 9 and the second arc-shaped die core 10, the inside of the formed elbow is hollow. The first blocking disc 323 and the second blocking disc 333 block both ends of the forming cavity 11, filling the forming cavity 11 with molten polyethylene and waiting for cooling.

[0048] After the molten polyethylene in the cavity 11 to be formed is cooled and formed, an arc-shaped tubular elbow structure is formed. Then, the motor 311 is started. The motor 311 drives the vertical screw rod 312 to rotate. Under the threaded connection and cooperation of the vertical screw rod 312 and the internal thread sleeve 313, and the sliding fit between the internal thread sleeve 313 and the box body 1, the rotation of the vertical screw rod 312 drives the internal thread sleeve 313 to slide vertically upward. The internal thread sleeve 313 drives the lower guide post 326 in the first opening component 32 and the upper guide post 336 in the second opening component 33 to move upward synchronously.

[0049] The lower guide post 326 moves upward and moves in the lower spiral guide groove 324. Under the guiding action of the lower spiral guide groove 324, the upward movement of the lower guide post 326 drives the lower guide tube 321 to rotate on the support frame 2. The lower guide tube 321 drives the lower fixing rod 322 and the first sealing disc 323 to rotate. The first sealing disc 323 drives the second arc-shaped die core 10 to rotate; the upper guide post 336 moves upward and moves in the upper spiral guide groove 334. Under the guiding action of the upper spiral guide groove 334, the upward movement of the upper guide post 336 drives the upper guide tube 331 to rotate on the support frame 2. The upper guide tube 331 drives the upper fixing rod 332 and the second sealing disc 333 to rotate the first arc-shaped die core 9; the rotation directions of the first arc-shaped die core 9 and the second arc-shaped die core 10 are opposite, so that the first arc-shaped die core 9 and the second arc-shaped die core 10 are moved out of the external of the forming cavity 11.

[0050] The motor 311 continues to drive the vertical screw rod 312 to rotate, so that the internal thread sleeve 313 moves upward. The internal thread sleeve 313 drives the lower guide post 326 to enter the lower vertical guide groove 325 from the lower spiral guide groove 324. When the lower guide post 326 moves upward along the lower vertical guide groove 325, the internal thread sleeve 313 stops rotating; the internal thread sleeve 313 drives the upper guide post 336 to enter the upper vertical guide groove 335 from the upper spiral guide groove 334. When the upper guide post 336 moves upward along the upper vertical guide groove 335, the upper guide tube 331 stops rotating. Thus, after the first arc-shaped die core 9 and the second arc-shaped die core 10 are moved out of the forming cavity 11, they stop rotating.

[0051] During the upward movement of the internal thread sleeve 313, the mounting rod 4 is driven to move upward synchronously. The mounting rod 4 drives the upper mold 6 to move upward synchronously, so that the distance between the upper mold 6 and the lower mold 7 becomes larger and larger. When the upper mold 6 moves above the formed polyethylene elbow, the jacking rod 1211 just contacts the bottom of the cross plate 1212 at this time. As the internal thread sleeve 313 continues to move upward, the jacking rod 1211 pushes the cross plate 1212 to move upward. The cross plate 1212 drives the vertical sliding rod 1213 to move upward, and the spring 1214 is elastically compressed. The vertical sliding rod 1213 drives the arc-shaped ejecting support plate 1215 to move upward, so as to eject the formed polyethylene elbow from the lower mold 7 through the two arc-shaped ejecting support plates 1215 until the polyethylene elbow moves above the lower mold 7, so that the operator can more conveniently take out the formed polyethylene elbow.

[0052] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it.

Claims

1. A seamless polyethylene elbow forming device, characterized in that, Including: A box body (1), a support frame (2) is fixedly connected to the top of the box body (1), an opening and closing component (3) is installed on the support frame (2), an installation rod (4) is arranged on the upper part of the opening and closing component (3), a lower die (7) adapted to the upper die (6) is fixedly connected to the top of the box body (1), an injection pipe (5) is communicated with the top of the upper die (6), and a forming cavity (11) is jointly arranged in the upper die (6) and the lower die (7); A first arc-shaped die core (9) and a second arc-shaped die core (10) are symmetrically arranged in the forming cavity (11); The opening and closing component (3) includes a driving component (31), a first opening component (32) and a second opening component (33). The first opening component (32) is used for driving the second arc-shaped die core (10) to move out of the forming cavity (11), the second opening component (33) is used for driving the first arc-shaped die core (9) to move out of the forming cavity (11), and the driving component (31) is used for driving the first opening component (32) and the second opening component (33) to move simultaneously; An air extraction component (8) is arranged on the lower die (7); An ejection component (12) is further arranged on the lower die (7).

2. The seamless polyethylene elbow forming device according to claim 1, characterized in that: The driving component (31) includes a motor (311), the motor (311) is fixedly connected to the inner bottom of the box body (1), the rotating end of the motor (311) is fixedly connected to a vertical threaded rod (312), the vertical threaded rod (312) is rotatably connected to the inside of the box body (1), an internal thread sleeve (313) is longitudinally and slidably connected through the upper part of the box body (1), and the vertical threaded rod (312) extends into the internal thread sleeve (313) and is threadedly connected thereto.

3. The seamless polyethylene elbow forming device according to claim 2, characterized in that: The first opening component (32) includes a lower guide pipe (321), the lower guide pipe (321) is movably sleeved outside the internal thread sleeve (313), the lower guide pipe (321) is rotatably connected to the support frame (2), a lower spiral guide groove (324) and a lower vertical guide groove (325) are longitudinally formed in the side wall of the lower guide pipe (321), the top end of the lower spiral guide groove (324) is communicated with the bottom end of the lower vertical guide groove (325), a lower guide post (326) is fixedly connected to the outer side wall of the internal thread sleeve (313), the lower guide post (326) is arranged in the lower spiral guide groove (324), a lower fixing rod (322) is fixedly connected to the outer side wall of the lower guide pipe (321), one end of the lower fixing rod (322) is fixedly connected to a first sealing disc (323), and one side of the first sealing disc (323) is fixedly connected to one end of the second arc-shaped die core (10).

4. The seamless polyethylene elbow forming device according to claim 1, characterized in that: The second opening component (33) includes an upper guide tube (331). The upper guide tube (331) is movably sleeved outside the internal thread sleeve (313). The upper guide tube (331) is rotatably connected to the support frame (2). An upper spiral guide groove (334) and an upper vertical guide groove (335) are penetratingly formed on the side wall of the upper guide tube (331). The top end of the upper spiral guide groove (334) is communicated with the bottom end of the upper vertical guide groove (335). An upper guide post (336) is fixedly connected to the outside of the internal thread sleeve (313). The upper guide post (336) extends into the upper spiral guide groove (334). An upper fixing rod (332) is fixedly connected to the outside of the upper guide tube (331). One end of the upper fixing rod (332) is fixedly connected to a second sealing disc (333). One side of the second sealing disc (333) is fixedly connected to one end of the first arc-shaped die core (9).

5. The seamless polyethylene elbow forming device according to claim 1, wherein: The air extraction component (8) includes an air extraction cavity (811). The air extraction cavity (811) is formed in the lower die (7). A communication hole (817) communicating with the air extraction cavity (811) is penetratingly formed in the lower die (7). A plugging block (813) is slidably arranged in the communication hole (817). One end of the plugging block (813) extends into the air extraction cavity (811) and is fixedly connected to a connecting rod (816). The other end of the plugging block (813) is flush with the inner side of the lower die (7). An electric cylinder (814) is penetratingly and fixedly connected to the lower die (7). The telescopic end of the electric cylinder (814) extends into the air extraction cavity (811) and is fixedly connected to one side of the connecting rod (816).

6. The seamless polyethylene elbow forming device according to claim 5, wherein: An air extraction pump (815) is fixedly installed in the box body (1). The air inlet end of the air extraction pump (815) is communicated with a communication pipe (812). One end of the communication pipe (812) passes through the lower die (7) and is communicated with the air extraction cavity (811).

7. The seamless polyethylene elbow forming device according to claim 1, wherein: The ejecting component (12) includes a jacking rod (1211). One end of the jacking rod (1211) is fixedly connected to the lower part of the outside of the internal thread sleeve (313). Two accommodating grooves (1216) are symmetrically formed in the inner side of the lower die (7). Arc-shaped ejecting support plates (1215) are arranged in the two accommodating grooves (1216). Vertical sliding rods (1213) are fixedly connected to the lower surfaces of the arc-shaped ejecting support plates (1215). The vertical sliding rods (1213) longitudinally penetrate and are slidably connected to the lower die (7). The bottom ends of the two vertical sliding rods (1213) are jointly fixedly connected to a cross plate (1212).

8. The seamless polyethylene elbow forming device according to claim 7, wherein: A spring (1214) is sleeved outside the vertical sliding rod (1213). The top end of the spring (1214) is fixedly connected to the bottom of the lower mold (7), and the bottom end of the spring (1214) is fixedly connected to the top of the cross plate (1212). The cross plate (1212) is arranged directly above the other end of the jacking rod (1211).

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