CN210415475U

CN210415475U - Screw heat dissipation device for double-screw extruder

Info

Publication number: CN210415475U
Application number: CN201921207265.3U
Authority: CN
Inventors: 李增洪; 李华栋; 李国梁; 周国; 叶键
Original assignee: Foshan Gaoming Aibo Advertising Decoration Materials Co ltd
Current assignee: Foshan Gaoming Aibo Advertising Decoration Materials Co ltd
Priority date: 2019-07-26
Filing date: 2019-07-26
Publication date: 2020-04-28
Anticipated expiration: 2029-07-26

Abstract

The utility model discloses a screw rod heat abstractor for twin-screw extruder, including twin-screw and oil supply unit, every screw rod keeps away from driving motor's axle head and sets up an axial extension's blind hole and be connected with the rotary joint of a two-way circulation formula, and the coaxial inner tube that is provided with in the blind hole forms heat dissipation channel between the inner wall of blind hole and the outer wall of inner tube, oil supply unit includes the oil tank, respectively with circulating pump and the cooling tube that the oil tank is connected, and two rotary joint's oil inlet is connected with the circulating pump through a tee bend governing valve, and their oil drain hole is connected with the cooling tube through another tee bend governing valve. The circulating pump simultaneously conveys normal temperature oil to the corresponding inner pipe through the three-way regulating valve, then the normal temperature oil flows through the heat dissipation channel, the normal temperature oil absorbs heat on the double screws to become hot oil, and a part of internal heat is effectively absorbed, so that materials in the constant temperature area obtain proper heat, and the problem of parison quality caused by excessive heat absorbing the internal heat is avoided.

Description

Screw heat dissipation device for double-screw extruder

Technical Field

The utility model relates to a PS sheet production technical field, in particular to a screw rod heat abstractor for double screw extruder.

Background

The PS sheet is a sheet-like material obtained by shaping PS pellets after preliminary foaming, and a foaming mechanism for performing preliminary foaming in a general PS sheet production apparatus, as shown in fig. 6 (top view), includes a first extruder 1 ', a second extruder 2 ', and a conveyor 4 ' (typically a screw conveyor) for conveying a raw material from a filter outlet to a screw of the second extruder; the first extruder has an inlet hopper 1.1' for the PS granulate and auxiliary materials; the barrels of the second extruder 2 'are connected to an external gas blowing agent delivery pipe 5', the delivery pipe 5 'being used to deliver gas blowing agent (e.g. butane) to the barrels of the second extruder 2'.

The first extruder of the foaming mechanism can adopt a double-screw extruder, and compared with a single screw, the material can be effectively prevented from being aggregated into a mass under the extrusion action of two screws, and the stirring uniformity degree is higher. The extrusion temperature is properly controlled, whether the set temperature is correct or not directly determines the quality of an extruded plastic parison, generally, a screw cylinder is divided into a heating area and a constant temperature area according to various forms, temperature bearing degree and heat requirement conditions of materials in the extrusion process, the materials pass through the heating area and are basically melt-shaped, but the temperature is not uniform and not completely plasticized, the materials need to be further constant temperature and completely plasticized, and certain heat is needed for the materials in the area to guarantee the material problem. However, the shearing and calendering action of the double screw on the material is converted into a large amount of internal heat, and the heat of the internal heat exceeds the requirement of the material, so that the quality problems of bending of the inner ribs of the parison, foaming of the inner wall and the like are easily caused.

It is seen that improvements and enhancements to the prior art are needed.

SUMMERY OF THE UTILITY MODEL

In view of the foregoing deficiencies of the prior art, an object of the present invention is to provide a screw heat dissipation device for a twin-screw extruder, which aims to reduce the temperature of twin screws, thereby making reasonable use of the internal heat temperature and improving the quality of extruded plastic parison.

In order to achieve the purpose, the utility model adopts the following technical proposal:

the utility model provides a screw heat abstractor for twin-screw extruder, includes the twin-screw and sets up at the outside oil supply unit of twin-screw extruder, and every screw rod is kept away from driving motor's axle head and is offered an axial extension's blind hole and be connected with the rotary joint of a two-way circulation formula, and the coaxial inner tube that is provided with in the blind hole forms heat dissipation channel between the inner wall of blind hole and the outer wall of inner tube, oil supply unit includes the oil tank, respectively with circulating pump and the cooling tube of oil tank connection, rotary joint has catheter, backward flow chamber, oil inlet, oil drain port, oil inlet and catheter connection, oil drain port and backward flow chamber intercommunication, the catheter is pegged graft mutually with the inner tube, and two rotary joint's oil inlet is connected with the circulating pump through a tee bend governing valve, and.

The end part, close to the rotary joint, of the inner pipe is sleeved with a support ring, the support ring and the inner pipe are coaxially arranged, the inner ring of the support ring is fixedly connected with the outer wall of the inner pipe in a welding mode, and the outer ring of the support ring is fixedly connected with the inner wall of the blind hole in a welding mode.

And a sealing ring mounting groove is formed in one end, close to the rotary joint, of the inner pipe, and a sealing ring is arranged in the sealing ring mounting groove.

The cooling tube is snakelike setting, and is including return bend and straight tube, it is a plurality of the straight tube sets up along vertical direction interval, adjacent two the return bend connection is passed through to the one end of straight tube equidirectional, is located the top the one end of straight tube is connected with the three-way control valve that corresponds, is located the bottom the one end and the oil tank of straight tube are connected.

Each straight pipe is provided with a plurality of radiating fins.

The radiating fins are ring pieces made of aluminum, and the ring pieces are sleeved on the straight pipe.

The two rotary joints are arranged on a rack of the double-screw extruder through a support arm, the support arm comprises a support plate and support legs arranged at two ends of the support plate, the support legs are connected with the rack through screws, an installation plate is arranged at the top of each rotary joint, and the two installation plates are connected with the support plate through bolts.

Has the advantages that:

the utility model provides a screw rod heat abstractor for twin-screw extruder, compared with the prior art, carry normal atmospheric temperature oil to the inner tube that corresponds simultaneously through the tee bend governing valve, then normal atmospheric temperature oil flows through heat dissipation channel, the heat that normal atmospheric temperature oil absorbed on the twin-screw becomes hot oil, the internal heat that the effect produced is cuted and is calendered to the material to partly twin-screw of effective absorption to make the material in the thermostatic zone obtain suitable heat, avoid leading to the fact parison quality problems because of absorbing the too much heat of internal heat.

Drawings

Fig. 1 is a schematic connection diagram of a twin screw and a rotary joint in the screw heat dissipation device provided by the present invention.

Fig. 2 is a partially enlarged view of the region L in fig. 1.

Fig. 3 is a schematic view of the connection between the three-way regulating valve and the oil supply device in the screw heat dissipation device for the twin-screw extruder provided by the present invention.

Fig. 4 is a schematic structural diagram of a support ring in a screw heat dissipation device for a twin-screw extruder provided by the present invention.

Fig. 5 is an assembly schematic diagram of a rotary joint in the screw heat dissipation device for the twin-screw extruder provided by the present invention.

Fig. 6 is a plan view of a foaming mechanism of a conventional PS sheet production apparatus.

Detailed Description

The utility model provides a screw rod heat abstractor for twin-screw extruder, for making the utility model discloses a purpose, technical scheme and effect are clearer, make clear and definite, and it is right that the following refers to the drawing and the embodiment of lifting is the utility model discloses further detailed description. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the scope of the invention.

Referring to fig. 1-3, the present invention provides a screw heat dissipation device for a twin-screw extruder, including a twin-screw 1 and an oil supply device 2 disposed outside the twin-screw extruder, wherein an axial extending blind hole 3 is disposed at an end of each screw shaft away from a driving motor and connected to a bidirectional circulation type rotary joint 4, an inner tube 5 is coaxially disposed in the blind hole 3, a heat dissipation channel 6 is formed between an inner wall of the blind hole and an outer wall of the inner tube, the oil supply device 2 includes an oil tank 21, a circulation pump 22 and a heat dissipation tube 23 respectively connected to the oil tank, the rotary joint 4 has a liquid guide tube 41, a return cavity 42, an oil inlet 43 and an oil outlet 44, the oil inlet 43 is connected to the liquid guide tube 41, the oil outlet 44 is connected to the return cavity 42, the liquid guide tube 41 is inserted into the inner tube 5, the oil inlets 43 of the two rotary joints 4 are, their oil discharge ports 44 are connected to the radiating pipe through another three-way regulating valve 8. It should be noted that the driving motor drives the twin-screw to rotate through the transmission mechanism, both ends of the twin-screw are rotatably connected with the frame through the bearing seat 71, and the shaft end far away from the driving motor extends out of the frame. In this embodiment, the degree of depth of blind hole extends to the starting point in barrel thermostatic zone, and the length of inner tube also correspondingly extends to the position that is close to the blind hole bottom, guarantees that heat exchange oil can flow through the blind hole bottom then the heat dissipation of backward flow. It should be noted that, the heat exchange medium flowing through the heat dissipation channel is preferably normal temperature oil, and the normal temperature oil can slowly absorb the heat of the twin-screw, so as to avoid the influence of the rapid cooling of the twin-screw on the mixing effect of the materials.

When the automatic feeding device works, PS granules and other auxiliary materials are placed into the feeding hopper, the driving motor drives the double screws to rotate to uniformly stir and mix materials in the screw barrel, the double screws in the constant-temperature area can generate a large amount of internal heat for shearing and calendering the materials and transmit the heat to the materials, the circulating pump 22 simultaneously conveys normal-temperature oil to the corresponding inner pipes 5 through the three-way regulating valve 8, then the normal-temperature oil flows through the heat dissipation channel 6, the normal-temperature oil absorbs the heat on the double screws to become hot oil, and part of internal heat is effectively absorbed, so that the materials in the constant-temperature area obtain proper heat, and the problem of parison quality caused by excessive heat absorbed by the internal heat is avoided. And finally, hot oil flows back to the radiating pipe through the oil drain port, so that the heat exchange and the radiation of the hot oil are accelerated to normal temperature. Through setting up three-way control valve except can simplifying arranging of oil pipeline, can also play the velocity of flow of oil circuit in the simultaneous control twin-screw, reach the effect of control radiating effect.

Specifically, referring to fig. 1, 2 and 4, in order to facilitate the installation and fixation of the inner tube, a support ring 51 is sleeved on the end portion of the inner tube 5 close to the rotary joint, the support ring and the inner tube are coaxially arranged, the inner ring of the support ring is fixedly connected with the outer wall of the inner tube in a welding manner, and the outer ring of the support ring is fixedly connected with the inner wall of the blind hole in a welding manner. By arranging the support ring, the outer ring of the support ring is in clearance fit with the inner wall of the blind hole, the inner ring of the support ring is in clearance fit with the outer wall of the inner pipe, and the support ring can circumferentially fix the inner pipe; the blind hole, the support ring and the inner pipe are connected in sequence in a welding mode, so that the axial positioning of the inner pipe is realized, and the support ring and the inner pipe are ensured not to move relative to the blind hole. Preferably, because the length of single screw is longer, can also set up a plurality of support ring on the pipe shaft of inner tube, the inner ring of these support rings passes through welding mode and the outer wall fixed connection of inner tube, and the outer loop and the blind hole inner wall clearance fit of these support rings improve the stability that the inner tube supported. It should be noted that there are two through slots 52 between the inner ring and the outer ring of the support ring 51, through which oil can pass, and this does not affect the oil circulation.

Preferably, referring to fig. 2, a sealing ring installation groove 81 is formed at one end of the inner pipe 5 close to the rotary joint, and a sealing ring 82 is arranged in the sealing ring installation groove. Through setting up the sealing washer, guarantee feed liquor pipe and inner tube connection's leakproofness, avoid oil to reveal.

In this embodiment, please refer to fig. 3, the heat dissipation pipe 23 includes an even number of straight pipes 23a and bent pipes 23b, the heat dissipation pipe is in a serpentine shape, the straight pipes are arranged at intervals along the vertical direction, one end of the straight pipe located at the top is connected to the liquid discharge port, the other end of the straight pipe located below the straight pipe is connected to one end of the straight pipe in the same direction through the bent pipe, one end of the straight pipe located at the bottom is connected to the oil tank, the other end of the straight pipe located above the straight pipe is connected to one end of the straight pipe in the same direction through the bent pipe, and the end of any other straight pipe is sequentially connected to the end of the adjacent straight pipe in. Preferably, in this embodiment, return bend and straight tube integrated into one piece, the cooling tube is formed by whole seamless steel pipe is whole bending, reduces welding process, improves the bearing capacity of cooling tube. By such an arrangement, the flow path of the hot oil can be increased, preferably, the heat exchange efficiency can be improved.

Preferably, referring to fig. 3, each of the straight pipes is provided with a plurality of heat dissipation fins 24, so as to further enhance the heat dissipation effect. Preferably, the radiating fins are aluminum circular ring pieces, and the circular ring pieces are sleeved on the straight pipe.

Referring to fig. 5, in order to facilitate fixing and mounting of the rotary joints, the two rotary joints 4 are mounted on a frame of the twin-screw extruder through a support arm 9, the support arm 9 includes a support plate 91 and support legs 92 disposed at two ends of the support plate, the support legs are connected with the frame by screws, a mounting plate is disposed on the top of each rotary joint, and the two mounting plates are connected with the support plate by bolts, so that the structure is compact and the assembly and disassembly are convenient. Here, the rotary joint is preferably a QS-X type rotary bidirectional circulation rotary joint for a liquid guide tube manufactured by sandiskei mechanical manufacturing ltd, tengzhou, and the liquid guide tube and the inner tube can be operated simultaneously.

Referring to fig. 3, in order to facilitate the installation and fixation of the oil pump, the heat dissipation pipe, and the oil tank, the heat dissipation pipe, and the oil tank are vertically disposed on a mounting rack 10 in sequence, so as to save the occupied area.

It is understood that equivalent substitutions or changes can be made by those skilled in the art according to the technical solution of the present invention and the inventive concept thereof, and all such changes or substitutions shall fall within the scope of the present invention.

Claims

1. A screw heat dissipation device for a double-screw extruder is characterized by comprising double screws and an oil supply device arranged outside the double-screw extruder, wherein an axially extending blind hole is formed at the shaft end of each screw, which is far away from a driving motor, and is connected with a bidirectional circulating type rotary joint, an inner pipe is coaxially arranged in the blind hole, a heat dissipation channel is formed between the inner wall of the blind hole and the outer wall of the inner pipe, the oil supply device comprises an oil tank, a circulating pump and a radiating pipe which are respectively connected with the oil tank, the rotary joint is provided with a liquid guide pipe, a backflow cavity, an oil inlet and an oil outlet, the oil inlet is connected with the liquid guide pipe, the oil outlet is communicated with the backflow cavity, the liquid guide pipe is inserted with the inner pipe, the oil inlets of the two rotary joints are connected with the circulating pump through a three-way regulating valve, and the oil outlets of the two rotary joints are connected with the radiating pipe through another three-way regulating valve.

2. The screw heat dissipation device for the twin-screw extruder as defined in claim 1, wherein a support ring is sleeved on the end of the inner tube near the rotary joint, the support ring is coaxial with the inner tube, the inner ring of the support ring is fixedly connected with the outer wall of the inner tube by welding, and the outer ring of the support ring is fixedly connected with the inner wall of the blind hole by welding.

3. The screw heat dissipation device for a twin-screw extruder as claimed in claim 1, wherein a sealing ring installation groove is formed at one end of the inner tube close to the rotary joint, and a sealing ring is arranged in the sealing ring installation groove.

4. The screw heat dissipation device for the twin-screw extruder according to claim 1, wherein the heat dissipation pipe is in a serpentine shape and comprises bent pipes and straight pipes, a plurality of straight pipes are arranged at intervals in the vertical direction, the equidirectional ends of two adjacent straight pipes are connected through the bent pipes, one end of each straight pipe at the top is connected with a corresponding three-way regulating valve, and one end of each straight pipe at the bottom is connected with an oil tank.

5. The screw heat dissipating device for a twin screw extruder as claimed in claim 4, wherein each of said straight pipes is provided with a plurality of heat dissipating fins.

6. The screw heat dissipation device for the twin-screw extruder as defined in claim 5, wherein the heat dissipation fins are aluminum circular ring pieces, and the circular ring pieces are sleeved on the straight pipe.

7. The screw heat sink for a twin-screw extruder according to claim 1, wherein the two rotary joints are mounted on the frame of the twin-screw extruder via an arm, the arm includes a support plate and legs provided at both ends of the support plate, the legs are screwed to the frame, the top of the rotary joints is provided with mounting plates, and the two mounting plates are bolted to the support plate.