Sizing sleeve for injection molding of polyethylene pipe

Abstract

The utility model discloses a sizing sleeve for injection molding of a polyethylene pipe, and mainly relates to the field of extrusion equipment. Comprising a water jacket, a connecting flange, a sleeve and a disc which are sequentially and coaxially connected and fixed, a fixing frame is fixed to the end face of the side, away from the water jacket, of the connecting flange, the fixing frame comprises a front fixing ring and a rear fixing ring which are located at the two ends, the front fixing ring is fixed to the connecting flange, and a plurality of connecting rods are arranged between the front fixing ring and the rear fixing ring. The center of each disc is provided with a guide opening corresponding to the inner diameter of the corresponding sleeve, the peripheral side of each disc is provided with a first positioning hole connected with the corresponding connecting rod in a sleeved mode, a plurality of additional pieces are arranged between every two adjacent discs, and the two ends of each additional piece are provided with inserting grooves movably connected with the corresponding adjacent connecting rod in an inserted mode respectively. The pipe cooling and shaping device has the advantages of being capable of efficiently cooling and shaping pipes and convenient to assemble and adjust.

Description

Technical Field

[0001] The utility model relates to the field of extrusion equipment, in particular to a sizing sleeve for polyethylene pipe injection molding. Background Technique

[0002] After the pipe is extruded from the die, its temperature is still relatively high. Due to its own weight and the effect of die-swell, deformation will occur. Therefore, cooling and shaping measures must be taken to ensure the dimensional and shape accuracy of the pipe and good surface quality. The role of the sizing sleeve is to ensure that the outer diameter or inner diameter of the pipe reaches the specified dimensional tolerance range and obtains good surface quality after cooling. Therefore, for the injection molding production of polyethylene pipes, the sizing sleeve is a crucial component in pipe forming, directly affecting the internal and external quality of the pipe.

[0003] The existing sizing sleeves include disc types, which mainly cool and guide through multiple discs and gradually widen the spacing to achieve separation. This structure has good cooling effect and maintains guiding assistance. Due to the limited length of the sizing sleeve, the layout of the discs has a direct impact on shaping. Due to objective differences in the production environment and differences in parameters in different batches of production, it is difficult to maintain sufficient shaping effect of the sizing sleeve on the pipe, and the quality is difficult to guarantee. Content of the Utility Model

[0004] The purpose of the utility model is to provide a sizing sleeve for polyethylene pipe injection molding, which can efficiently cool and shape the pipe, and is convenient for assembly and adjustment.

[0005] In order to achieve the above object, the utility model is realized through the following technical solutions:

[0006] A sizing sleeve for polyethylene pipe injection molding includes a water jacket, a connecting flange, a sleeve, and discs that are coaxially connected and fixed in sequence. The sleeve penetrates through the connecting flange and is fixed relative to the connecting flange. Slits are distributed on the side wall of the sleeve. A fixing frame is fixed on the end face of the connecting flange away from the water jacket. The fixing frame includes a front fixing ring and a rear fixing ring at both ends. The front fixing ring is fixed on the connecting flange. A plurality of connecting rods are provided between the front fixing ring and the rear fixing ring. A guiding port corresponding to the inner diameter of the sleeve is provided in the center of the disc. A first positioning hole for sleeving with the connecting rod is provided on the circumferential side of the disc. A number of additional pieces are provided between adjacent discs. Slots for movably inserting into adjacent connecting rods are respectively provided at both ends of the additional piece.

[0007] The water jacket is a circular part, and a circular sinking groove is centrally provided on the end face adjacent to the connecting flange. An installation hole that penetrates the water jacket coaxially is provided at the center of the sinking groove. The inner diameter of the installation hole corresponds to the outer diameter of the sleeve. The part of the sleeve located within the installation hole is provided with a water inlet hole that penetrates it. Annular water channels are respectively provided on the inner wall and outer wall of the sleeve at positions corresponding to the water inlet hole. A water channel that penetrates the side wall of the water jacket is provided, and a connector communicating with the water channel is fixed on the outer wall of the water jacket.

[0008] On the incoming material end face of the connecting flange, a circular falling groove coaxial with the fixing port is provided. On one end face of the sinking groove opening side of the water jacket, a plurality of first screw grooves are provided. An installation bolt that penetrates the falling groove is provided on the connecting flange, and the installation bolt is matched with the first screw grooves.

[0009] An installation step is provided at the edge of the installation hole close to the incoming material end face of the water jacket. The installation step is used to abut against the incoming material end face of the sleeve. A support column with a diameter larger than that of the connecting rod is fixed on the incoming material end face of the connecting rod. A stepped structure is formed at the connection between the support column and the connecting rod. The first positioning hole cannot penetrate the support column, and the end face of the support column is flush with the end face of the sleeve.

[0010] There are four connecting rods, and the additional pieces are symmetrically and oppositely arranged relative to the fixing frame.

[0011] The slot is a U-shaped groove, and its groove bottom is a semi-circular arc corresponding to the diameter of the connecting rod. The openings of the two slots are arranged in opposite directions. A rectangular limiting groove is centrally provided on the outer side edge of the additional piece. Limiting strips detachably fixed to it are symmetrically provided on both sides of the fixing frame. The limiting groove on the additional piece is movably inserted with the limiting strips, and both ends of the limiting strips are detachably fixed to the front fixing ring and the rear fixing ring respectively.

[0012] On the end face of the connecting rod adjacent to the rear fixing ring, a third screw hole is provided. A screw matching the third screw hole is penetrated at the position corresponding to the axis of the connecting rod on the rear fixing ring.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] This sizing sleeve can achieve good shaping and auxiliary propulsion for cooling after the extrusion of the pipe. After the pipe is cooled by the water curtain, it is successively cooled and auxiliary stably shaped by the sleeve and the disc. The distance of the disc is controlled through the additional piece, which is convenient for assembly and adjustment. The structure is simple, the production efficiency is improved, and the forming quality of the pipe is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the front view of the present utility model.

[0016] Figure 2It is a schematic diagram of one end of the present utility model.

[0017] Figure 3 It is the present utility model Figure 2 Partial schematic diagram of the A-A section.

[0018] Figure 4 It is the present utility model Figure 2 Partial schematic diagram of the B-B section.

[0019] Figure 5 It is a schematic diagram of the disassembly of the components of the present utility model.

[0020] Figure 6 It is a schematic diagram of the combined effect of the disc and the additional piece of the present utility model.

[0021] Figure 7 It is a schematic diagram of the whole of the present utility model.

[0022] Reference numerals shown in the drawings:

[0023] 1. Connecting flange; 2. Water jacket; 3. Sunk groove; 4. Mounting hole; 5. Water channel; 6. Connector; 7. Sleeve; 8. Slit; 9. Water inlet hole; 10. Water tank; 11. First thread groove; 12. Front fixing ring; 13. Rear fixing ring; 14. Connecting rod; 15. Support column; 16. Disc; 17. Guide port; 18. First positioning hole; 19. Additional piece; 20. Slot; 21. Yielding side; 22. Limiting groove; 23. Limiting bar. Specific embodiments

[0024] The following further elaborates the present utility model in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present utility model and not to limit the scope of the present utility model. In addition, it should be understood that after reading the content taught by the present utility model, those skilled in the art can make various changes or modifications to the present utility model, and these equivalent forms also fall within the scope defined by this application.

[0025] The main structure includes a water jacket 2, a connecting flange 1, a sleeve 7, a fixing frame, and a disc 16 that are coaxially connected and fixed in sequence;

[0026] For the convenience of description, for all components, the side facing the incoming material of the pipe is defined as the incoming material end face, and the other side facing the cooling and outgoing material direction of the pipe is defined as the outgoing material end face.

[0027] The connecting flange 1 is used to fix the water jacket 2, the sleeve 7, the fixing frame, etc. The connecting flange 1 is an annular flange, with a circular fixing opening in the center. The sleeve 7 passes through the fixing buckle and is fixed to the connecting flange 1. Multiple slits 8 are cut in a staggered manner on the circumferential side of the sleeve 7, and the slits 8 penetrate the side wall of the sleeve 7.

[0028] The incoming material end face of the connecting flange 1 is provided with a circular dropping groove coaxial with the fixed port, and the outgoing material end face of the connecting flange 1 is provided with a circular positioning groove coaxial with the fixed port.

[0029] The water jacket 2 is used to connect to a water source to complete the function of water curtain cooling. The water jacket 2 is an annular part. The water jacket 2 is a circular part and a circular sunk groove 3 is centrally provided on its outgoing material end face, which is convenient for forming a cooling space and providing space for water flow to penetrate through the slit 8. An installation hole 4 that penetrates the water jacket 2 coaxially is provided in the center of the sunk groove 3. The inner diameter of the installation hole 4 corresponds to the outer diameter of the sleeve 7. An installation step is provided at the edge of the installation hole 4 close to the incoming material end face of the water jacket 2. The installation step is used to abut against the incoming material end face of the sleeve 7. A water inlet hole 9 that penetrates it is provided in the part of the sleeve 7 located in the installation hole 4. The water holes are arranged in an annular array around the sleeve 7. Annular water grooves 10 are respectively provided on the inner wall and the outer wall of the sleeve 7 corresponding to the position of the water inlet hole 9. A water channel 5 that penetrates the water jacket 2 is provided on the side wall of the water jacket 2. A joint 6 that communicates with the water channel 5 is fixed on the outer wall of the water jacket 2. The joint 6 is used to connect a water pipe, so as to access a water source to realize water cooling.

[0030] A plurality of first screw grooves 11 are provided on the outgoing material end face of the water jacket 2. An installation bolt that penetrates the dropping groove is provided on the connecting flange 1. The installation bolt cooperates with the first screw grooves 11 to fix the water jacket 2 on the connecting flange 1. At the same time, when fixing the water jacket 2, the incoming material end face of the sleeve 7 is fixedly limited.

[0031] A fixing frame is fixed in the positioning groove. The fixing frame includes a front fixing ring 12 and a rear fixing ring 13 at both ends. The front fixing ring 12 and the rear fixing ring 13 are respectively annular parts coaxially arranged with the connecting flange 1. The front fixing ring 12 is fixed in the positioning groove. The inner diameter of the front fixing ring 12 is larger than the outer diameter of the sleeve 7, which is convenient for the sleeve 7 to penetrate. The fixing frame also includes a plurality of connecting rods 14 arranged in an annular array. In this example, 4 connecting rods 14 are adopted. A support column 15 with a diameter larger than that of the connecting rod 14 is fixed on the incoming material end face of the connecting rod 14. A stepped structure is formed at the connection between the support column 15 and the connecting rod 14, which is used to fix the position of the frontmost disc 16. The outgoing material end face of the connecting rod 14 is fixed on the rear fixing ring 13. The incoming material end face of the support column 15 is fixed on the front fixing ring 12. The outgoing material end face of the support column 15 is flush with the outgoing material end face of the sleeve.

[0032] A guiding port 17 corresponding to the inner diameter of the sleeve is provided in the center of the disc 16. Both the guiding port 17 and the inner hole of the sleeve are used to guide and restrict the process of pipe forming.

[0033] Therefore, based on the structure of the disc 16 and the support column 15, the end face of the sleeve 7 can be limited, so that the sleeve 7 can be limited on the two end faces, so that the installation of the sleeve 7 can be conveniently fixed, and the disassembly is convenient, and the fixed structure is combined to achieve a simple disassembly design. More importantly, through the limit fixing method of the two ends of the contact, the disc 16 and the sleeve can be directly connected. If other existing positioning sleeves use a combination structure of a sleeve and a disc 16, it is inevitable to set a support structure between the first disc 16 and the end of the sleeve. Even if the support structure is made of metal, it is bound to be far inferior to the disc 16 in terms of heat dissipation. The above structure has no waste in the stroke after the pipe is formed, and it directly enters the disc 16 area after passing through the sleeve, thereby improving the heat dissipation efficiency.

[0034] The circumferential side of the disc 16 is provided with corresponding first positioning holes 18 corresponding to the four connecting rods 14. The inner diameter of the first positioning holes 18 corresponds to the connecting rod 14. The fixing of the existing disc 16 mostly relies on the slots or other similar structures on the rod. This structure has many problems in processing and use. First, it has high requirements for processing accuracy and is troublesome during assembly. Secondly, this structure has solidified the spacing and spacing changes of the discs 16 at the beginning of design and processing, but the production environment and parameters cannot remain unchanged. For example, the batch differences of each batch, the temperature of the workshop in different seasons, etc., result in that the cooling speed of the pipe after forming cannot be completely consistent like the simulation threshold. This results in that if a long shaping time is encountered during production, it cannot be adjusted in time, and the production efficiency can only be sacrificed to reduce the extrusion speed.

[0035] In the present design, the design of the spacing between the discs 16 is achieved through an additional sheet 19, which is a sheet located between the discs 16 and can be obtained by metal processing of the same material as the discs 16, and also has heat dissipation capabilities. Both ends of the additional sheet 19 are respectively provided with slots 20 corresponding to the connecting rod 14, and the slots 20 are U-shaped slots and the bottom of the slots is a semicircular arc corresponding to the diameter of the connecting rod 14, which is used to be inserted into two adjacent connecting rods 14 to achieve quick matching, and the notches of the two slots 20 are set in reverse, so that the additional sheet 19 can be directly inserted or removed by tilting it, and the number of additional sheets 19 can be arbitrarily increased or decreased from the connecting rod 14 without moving any discs 16.

[0036] The inner side of the additional piece 19 is provided with a yielding side edge 21, and the yielding side edge 21 is located within the projection range of the disc 16, so that there is a certain distance between the yielding side edge 21 of the additional piece 19 and the pipe. A rectangular limiting groove 22 is centrally provided on the outer side edge of the additional piece 19, and limiting strips 23 detachably fixed thereto are symmetrically provided on both sides of the fixing frame. The outer side of the rear fixing ring 13 is provided with a rear mounting groove with an opening at the bottom, and the outer side of the front fixing ring 12 is provided with a front mounting groove with an opening at the top. The two ends of the limiting strip 23 are respectively located in the rear mounting groove and the front mounting groove, and the two ends of the limiting strip 23 are respectively penetrated by fastening bolts, and the rear mounting groove and the front mounting groove are respectively provided with second screw grooves that cooperate with the fastening bolts, so as to realize the rapid positioning and fixing of the limiting strip 23, and the limiting groove 22 on the additional piece 19 fixed between the two connecting rods 14 is movably connected with the limiting strip 23, so as to fix the additional piece 19.

[0037] Based on the above structure, the spacing between adjacent discs 16 is determined by additional sheets 19 placed between the gaskets. The additional sheets 19 can be easily removed and added to adjust the spacing between the discs 16. The positioning sleeves are adjusted according to the cooling and hardening of the pipe so that the spacing and number of the discs 16 can be adapted to the current production conditions to ensure production quality and efficiency.

[0038] It is recommended that, during assembly, corresponding numbers of additional sheets 19 be symmetrically placed on both sides of adjacent discs 16. For example, taking the left and right sides as an example, the same number of additional sheets 19 are placed on both sides. The number of additional sheets 19 placed close to the incoming material direction is relatively small, so one or two additional sheets 19 are selected. The closer to the removing material direction, the more additional sheets 19 are placed, thereby increasing the spacing between the discs 16.

[0039] Four third screw holes are provided on the removal end surface of the connecting rod 14, and screws matching the third screw holes are passed through the rear fixing ring 13 to achieve the fixation of the rear fixing ring 13 and the connecting rod 14. By removing the screws, the rear fixing ring 13 can be disassembled, thereby increasing or decreasing the number of discs 16.

[0040] Based on the improved sizing sleeve, the pipe can be well shaped and assisted in cooling after extrusion. After cooling by the water curtain, the pipe enters the sleeve to achieve continuous cooling, and is shaped stably with the assistance of the sleeve. After the sleeve is completed, it is immediately guided and assisted in holding the shape by the disc 16, without wasting the process. The spacing of the discs 16 is fixed by the additional sheet 19, which not only reduces the difficulty of processing and assembly, but also can adjust the spacing of the discs 16 at any time by adjusting the number of additional sheets 19. The increase or decrease of the additional sheets 19 can be simply completed by plugging, without the need to disassemble other discs 16. It is convenient and efficient, with a simple structure, which improves production efficiency and ensures the quality of pipe forming.

Claims

1. A sizing sleeve for polyethylene pipe injection molding, comprising a water jacket, a connecting flange, a sleeve, and a disc that are fixedly connected coaxially in sequence. The sleeve penetrates through the connecting flange and is fixed relative to the connecting flange. Slits are distributed on the side wall of the sleeve. It is characterized in that, A fixing bracket is fixed on one side end face of the connecting flange away from the water jacket. The fixing bracket includes a front fixing ring and a rear fixing ring located at both ends. The front fixing ring is fixed on the connecting flange. A plurality of connecting rods are arranged between the front fixing ring and the rear fixing ring. A guiding opening corresponding to the inner diameter of the sleeve is provided at the center of the disc. A first positioning hole sleeved with the connecting rod is provided on the circumferential side of the disc. A plurality of additional pieces are arranged between adjacent discs. Slots for movably inserting into adjacent connecting rods are respectively provided at both ends of the additional piece.

2. The sizing sleeve for polyethylene pipe injection molding according to claim 1, wherein, The water jacket is a circular piece, and a circular sinking groove is provided in the middle of the end face adjacent to the connecting flange. An installation hole penetrating the water jacket coaxially is provided at the center of the sinking groove. The inner diameter of the installation hole corresponds to the outer diameter of the sleeve. A water inlet hole penetrating the sleeve is provided at the part of the sleeve located in the installation hole. Annular water grooves are respectively provided on the inner wall and the outer wall of the sleeve corresponding to the position of the water inlet hole. A water channel penetrating the water jacket is provided on the side wall of the water jacket. A joint communicated with the water channel is fixed on the outer wall of the water jacket.

3. The sizing sleeve for polyethylene pipe injection molding according to claim 2, characterized in that, A circular falling groove coaxial with the fixing opening is provided on the incoming material end face of the connecting flange. A plurality of first screw grooves are provided on one side end face of the sinking groove opening of the water jacket. An installation bolt penetrating the falling groove is provided on the connecting flange. The installation bolt is matched with the first screw groove.

4. The sizing sleeve for polyethylene pipe injection molding according to claim 2, characterized in that, An installation step is provided at the edge of the installation hole close to the incoming material end face of the water jacket. The installation step is used for abutting against the incoming material end face of the sleeve. A supporting column with a diameter larger than that of the connecting rod is fixed on the incoming material end face of the connecting rod. A stepped structure is formed at the connection between the supporting column and the connecting rod. The first positioning hole cannot penetrate the supporting column. The end face of the supporting column is flush with the end face of the sleeve.

5. The sizing sleeve for polyethylene pipe injection molding according to claim 1, wherein, There are four connecting rods, and the additional pieces are symmetrically and oppositely arranged relative to the fixing bracket.

6. The sizing sleeve for polyethylene pipe injection molding according to claim 5, characterized in that, The slot is a U-shaped groove, and the bottom of the slot is a semi-circular arc corresponding to the diameter of the connecting rod. The openings of the two slots are arranged in opposite directions. A rectangular limiting groove is provided in the middle of the outer side edge of the additional piece. Limiting strips detachably fixed to the fixing bracket are symmetrically arranged on both sides of the fixing bracket. The limiting groove on the additional piece is movably inserted into the limiting strip. Both ends of the limiting strip are detachably fixed to the front fixing ring and the rear fixing ring respectively.

7. The sizing sleeve for polyethylene pipe injection molding according to claim 1, wherein, A third screw hole is provided on the end face of the connecting rod adjacent to the rear fixing ring. A screw matched with the third screw hole penetrates through the rear fixing ring corresponding to the axis position of the connecting rod.

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