CN216658680U - Drying equipment and injection molding system for granular materials - Google Patents

Abstract

The utility model discloses a drying device for granular materials, which is characterized in that: comprises a storage hopper (2), a first charging barrel (1), a feeding screw (4) and a driving piece (5) for driving the feeding screw (4) to rotate around the axis of the feeding screw; the first charging barrel (1) is provided with an inner cavity (11) extending along the axial direction of the first charging barrel, the storage hopper (2) is communicated with the inner cavity (11), the feeding screw (4) is arranged in the inner cavity (11), and the rotation of the feeding screw (4) can enable the material entering the first charging barrel (1) to move towards the discharge hole (13) of the first charging barrel (1); the device also comprises a heating element (6) arranged on the periphery of the first charging barrel (1) and used for heating the materials moving in the first charging barrel (1). The utility model also discloses an injection molding system applying the drying equipment. Compared with the prior art, the drying equipment has the advantages of uniform heating of plastic particles, no color change, short time consumption, electricity saving, low cost and capability of effectively matching the operation of an injection molding machine.

Description

Drying equipment and injection molding system for granular materials

Technical Field

The utility model relates to the technical field of drying equipment, in particular to drying equipment for granular materials and an injection molding system.

Background

The injection molding machine is one of the most widely used injection molding machine products at present. When an injection molding machine works, granular or powdery plastic is generally added into a charging barrel, the plastic is in a molten state through the rotation of a screw rod in the charging barrel and the heating of the charging barrel, then the plastic is driven to be pushed forwards through the rotation of the screw rod, so that the plastic is ejected from a nozzle at high pressure and high speed, injected into a closed mold, and solidified into a required molded plastic product after pressure maintaining and cooling.

An injection molding machine generally includes a mold mechanism, a mold clamping mechanism, and an injection mechanism. Injection molding machines can be classified into hydraulic cylinder injection molding machines and electric injection molding machines according to the type of an injection mechanism thereof. The injection molding machines ejected by the hydraulic oil cylinders are divided into single-oil-cylinder ejection injection molding machines and multi-oil-cylinder ejection injection molding machines. For example, the existing injection mechanism of the hydraulic drive multi-cylinder injection horizontal injection molding machine generally comprises an injection seat, a pre-molding seat and a material cylinder, wherein the material cylinder is supported and arranged on the injection seat, a screw rod is arranged in the material cylinder, an oil motor capable of driving the screw rod to rotate is arranged on the pre-molding seat, the screw rod can always rotate and work in a reciprocating manner in the front and back direction without being separated from the power output by the oil motor, the screw rod is arranged on the pre-molding seat, a plurality of injection oil cylinders are arranged on the injection seat, piston rods of the injection oil cylinders are connected with the pre-molding seat and used for driving the pre-molding seat with the motor to move back and forth relative to the injection seat, and the lower parts of the injection seat and the pre-molding seat are penetrated on a guide rod of a frame and can slide along the guide rod under the driving of a seat moving oil cylinder. For example, a similar two-cylinder injection molding machine is disclosed in the utility model patent application No. CN200820168111.3 (publication No. CN201268080Y), which discloses an injection cylinder assembly structure of an injection molding machine.

The raw materials need to be dried before the injection molding machine feeds in raw materials to reduce the moisture in the raw materials, generally dry to plastic granules through the drying-machine in the production at present, can specifically refer to utility model patent "a hopper formula desiccator for plastic granules" that patent application number is CN202022743386.9 (publication number is CN214000149U), but this kind is through the mode of drying in the fan blows the hot-air storage hopper after will heating, there are plastic granules to be heated inhomogeneous, it is long, power consumptive, easy local overheat causes plastic granules to discolour, be difficult to the operation of synchronous matching injection molding machine, cause the room temperature to rise, raise dust scheduling problem. In order to solve the problems, the utility model patent of an injection molding machine metering dehumidification system with the patent application number of CN201510080091.9 (with the publication number of CN104742332A) discloses an injection molding machine metering dehumidification system, which comprises a charging barrel, a screw assembly arranged in the charging barrel, and a metering feeding device and an exhaust device arranged outside the charging barrel, wherein the material properties of raw materials before entering the charging barrel are in a stable original state; the screw rod assembly can realize secondary mixing and compression, the plastic raw materials are suddenly released after being compressed, the water and volatile substances in the plastic raw materials can be gasified, the plastic raw materials can be conveniently taken away by the exhaust device, and the dehumidification effect is good. However, the drying mode has a complex structure, the coaxial screw and the barrel are used for the steam exhaust drying function and the plastic particle plasticizing function, so that the drying and plasticizing processes cannot be well exerted due to mutual restriction, for example, the process speeds are mutually restricted due to inconsistency of the feeding speeds of the two processes, the effect and the speed of the drying and plasticizing processes are influenced, the integral injection molding time is prolonged, and the production efficiency is severely restricted.

SUMMERY OF THE UTILITY MODEL

The first technical problem to be solved by the utility model is to provide a drying device for granular materials, which is uniform in heating, free from color change, short in time consumption, power-saving, low in cost and capable of effectively matching the operation of an injection molding machine, aiming at the current situation of the prior art.

The second technical problem to be solved by the utility model is to provide a double-screw injection molding system with different axes, which is applied with the drying device.

The technical scheme adopted by the utility model for solving the first technical problem is as follows: the utility model provides a drying equipment of granular material which characterized in that: the device comprises a storage hopper, a first material cylinder, a feeding screw rod and a driving piece for driving the feeding screw rod to rotate around the axis of the feeding screw rod; the first material cylinder is provided with an inner cavity extending along the axial direction of the first material cylinder, the storage hopper is communicated with the inner cavity, the feeding screw is arranged in the inner cavity, and the rotation of the feeding screw can enable the material entering the first material cylinder to move towards the discharge hole of the first material cylinder; the heating device is arranged on the periphery of the first charging barrel and used for heating materials moving in the first charging barrel.

In order to facilitate timely steam exhaust and discharge of materials, the device further comprises a discharge bin communicated with a discharge port of the first material barrel, and the discharge bin is provided with a steam exhaust hole and a discharge hole. The steam exhaust hole can be provided with a filter screen to prevent the materials from splashing. In addition, an exhaust fan can be arranged at the exhaust hole to help exhaust steam.

In order to ensure that the material has sufficient time to exhaust steam, a buffer channel which is bent and extended is arranged in the discharge bin. The buffer channel can slow down the falling speed, prolong the detention time and be favorable for fully discharging the steam.

In order to facilitate the formation of the buffer channel, at least two guide plates which are arranged at intervals up and down are arranged in the discharge bin, the heads of the two adjacent guide plates are respectively arranged on the two opposite inner side walls of the discharge bin, each guide plate is gradually reduced from the head to the tail, and a gap is formed between the tail and the inner side walls of the discharge bin, so that the buffer channel is formed in the discharge bin. In order to better guide the granular materials, the guide plate can be provided with a guide groove.

In order to conveniently adjust the temperature of the materials in the conveying channel, a temperature sensor is arranged on the first material barrel and used for monitoring the temperature of the materials in the first material barrel. Like this, material temperature is too high or low excessively, sends the opening and close of controlling the heating member for the controller after temperature sensor gathers the signal.

In order to adjust the feeding speed according to the stacking condition conveniently, a sensor used for monitoring the height of materials in the discharging bin is arranged in the discharging bin.

In order to conveniently monitor excessive and insufficient stockpiling, the sensors comprise a first sensor and a second sensor which are respectively arranged at the upper part and the lower part of the discharging bin. Thus, if the materials are piled up, the first sensor collects signals and sends the signals to the controller to stop the driving part or reduce the rotating speed, if the materials are piled up too little, the second sensor collects signals and sends the signals to the controller to start the driving part to rotate or improve the rotating speed, and preferably, the feeding speed is synchronous with the material storage period.

In order to facilitate the sectional temperature control, the heating element comprises at least two heating rings which are arranged at intervals along the axial direction of the first material cylinder, and each heating ring is sleeved on the periphery of the first material cylinder.

In order to avoid heat from dissipating to the outside atmosphere as much as possible, the heating element further comprises a heat insulation sleeve which is sleeved on the periphery of the heating element.

The technical scheme adopted by the utility model for solving the second technical problem is as follows: an injection molding system, comprising: the drying equipment comprises the drying equipment and the injection molding machine, wherein the injection molding machine comprises a second material cylinder with an extrusion cavity and an extrusion screw rod arranged in the extrusion cavity, the second material cylinder is communicated with the discharge bin, and the feeding screw rod and the extrusion screw rod have different axes and operate independently.

Compared with the prior art, the utility model has the advantages that:

(1) the drying equipment is characterized in that a feeding screw is arranged in a first material cylinder, heating elements are arranged around the periphery of the first material cylinder, and the driving elements can drive the feeding screw to rotate around the axis of the driving elements, so that granular materials move at a constant speed in the first material cylinder and can be synchronously and fully stirred;

(2) the drying equipment is directly arranged on the injection molding machine, and the feeding screw of the drying equipment and the extrusion screw of the injection molding machine have different axes and can rotate and operate independently, so that the drying equipment and the injection molding machine can operate independently according to respective conditions without being mutually restrained in the operating speed, and the production efficiency is greatly improved. The granular materials dried by the drying equipment can be continuously and timely supplemented into a feeding channel of the injection molding machine, so that the effect of instant use is achieved, and the dried granular materials with lost heat do not need to be stored in advance; on the other hand, the granular materials carry residual heat after being discharged, and the residual heat can be used in the subsequent plasticizing process, so that the utilization rate of energy is improved, and the energy cost is reduced.

Drawings

FIG. 1 is a schematic perspective view of an embodiment of an injection molding system of the present invention;

FIG. 2 is a longitudinal cross-sectional view of the injection molding system of FIG. 1;

FIG. 3 is an enlarged view of the drying apparatus of FIG. 2;

FIG. 4 is an exploded perspective view of a drying apparatus in an embodiment of an injection molding system of the present invention.

Detailed Description

The utility model is described in further detail below with reference to the accompanying examples.

Referring to fig. 1-4, a preferred embodiment of the injection molding system of the present invention is shown. As shown in fig. 1, the injection molding system includes an injection molding machine 8 and a drying apparatus 10.

As shown in fig. 2, the injection molding machine 8 includes a second cylinder 81 having an extrusion chamber 811, and an extrusion screw 82 provided in the extrusion chamber 811, and the second cylinder 81 has a vertically arranged feed passage 812 communicating with the extrusion chamber 811. In this embodiment, the injection molding machine 8 is a two-cylinder injection molding machine, and the specific structure and the operation principle thereof can be referred to in the background patent (utility model patent application No. CN200820168111.3 (publication No. CN201268080Y) entitled "injection cylinder assembly structure of injection molding machine"), which is not further described herein.

As shown in fig. 4, the drying apparatus 10 includes a first barrel 1, a storage hopper 2, a discharge bin 3, a feed screw 4, a driving member 5, a heating member 6, and a heat insulating sleeve 7.

Wherein, as shown in fig. 3, the first material cylinder 1 is internally provided with an inner cavity 11 extending along the axial direction, the top wall of the front part of the first material cylinder 1 is provided with a feed inlet 12 communicated with the inner cavity 11, the rear part of the first material cylinder 1 is provided with a discharge outlet 13 communicated with the inner cavity 11, the peripheral wall of the front part of the inner cavity 11 is provided with a bearing 14,

the storage hopper 2 is arranged at the top of the first charging barrel 1 and is positioned right above the feeding hole 12, and a first storage cavity 21 communicated with the feeding hole 12 is arranged in the storage hopper 2.

The discharge bin 3 is arranged behind the first material barrel 1, a second storage cavity 31 is arranged in the discharge bin 3, the second storage cavity 31 is communicated with the discharge hole 13 of the hopper 1, a discharge hole 33 communicated with the second storage cavity 31 is formed in the bottom wall of the discharge bin 3, and a plurality of steam discharge holes 34 communicated with the second storage cavity 31 are formed in the upper part of the discharge bin 3, so that steam carried by materials entering the second storage cavity 31 can be discharged in time; at least two guide plates 35 which are arranged at intervals up and down are arranged in the discharge bin 3, the heads of the two adjacent guide plates 35 are respectively arranged on two opposite inner side walls of the discharge bin 3, the tail parts of the two adjacent guide plates 35 extend towards the inside of the discharge bin 3 and are arranged in a staggered manner, the upper surface of each guide plate 35 gradually decreases from the head part to the tail part, and a gap is formed between the tail part and the inner side wall of the discharge bin 3, so that a buffer channel 311 which is bent and extends from top to bottom is formed in the second storage cavity 31; the rear side wall of the upper part of the discharging bin 3 is provided with a through hole 36 communicated with the second material storage cavity 31.

The feeding screw rod 4 is rotatably arranged in the inner cavity 11, a spiral conveying channel 111 is formed by the feeding screw rod 4 and the inner wall of the inner cavity 11 in a surrounding way, the inlet of the conveying channel 111 is communicated with the feeding hole 12, and the outlet of the conveying channel 111 is communicated with the discharging hole 13; the front end of the feeding screw rod 4 is arranged on the inner ring of the bearing 14, and the rear end of the feeding screw rod 4 passes through the discharging bin 3 backwards and extends into the second material storage cavity 31.

The driving member 5 is an electric motor or a hydraulic motor, and is mounted on the outer side wall of the discharging bin 3, and the power output shaft thereof passes through the through hole 36 forward and extends into the second material storage chamber 31 and is connected with the rear end of the feeding screw 4, so as to drive the feeding screw 4 to rotate around the axis thereof, so that the material is conveyed from the inlet of the material conveying channel 111 to the outlet of the material conveying channel 111.

The heating element 6 comprises at least two heating rings 61 which are arranged along the axial direction of the first charging barrel 1 at intervals, and each heating ring 61 is sleeved on the periphery of the first charging barrel 1 and used for heating the material in the material conveying channel 111.

The heat insulation sleeve 7 is sleeved on the peripheries of all the heating rings 61 and used for avoiding heat from dissipating to the outside atmosphere as far as possible, so that on one hand, the room temperature is prevented from rising, and on the other hand, the energy is saved.

In addition, as shown in fig. 3, a temperature sensor 15 is arranged on the first material barrel 1 and is used for monitoring the temperature of the material in the material conveying channel 111, a first sensor 32a and a second sensor 32b are respectively arranged at the upper part and the lower part of the discharging bin 3 and are used for monitoring the height of the material in the second material storage cavity 31, in this embodiment, the first sensor 32a and the second sensor 32b are both photoelectric sensors; the drying device has a control which is electrically connected to the temperature sensor 15, the first sensor 32a, the second sensor 32b, the heating coil 61 and the drive 5. Therefore, when the temperature of the material is too high or too low, the temperature sensor 15 acquires a signal and sends the signal to the controller to control the on-off of the heating ring 61; if the materials are piled up, the first sensor 32a collects signals and sends the signals to the controller to stop the driving part 6 or reduce the rotating speed, and if the materials are piled up too little, the second sensor 32b collects signals and sends the signals to the controller to start the driving part 6 to operate or improve the rotating speed.

In this embodiment, the discharging bin 3 of the drying apparatus 10 is installed on the top of the second barrel 81 of the injection molding machine 8, and the second material storage chamber 31 is communicated with the inlet of the feeding channel 812 through the discharging hole 33, so that the dried granular materials can be continuously supplemented into the feeding channel 812 of the injection molding machine 8, and the feeding screw 4 and the extruding screw 82 have different axes and operate independently of each other, thereby avoiding the problem of mutual interference.

The working principle of the embodiment is as follows: when the injection molding machine is used, firstly, undried granular materials are placed in a first storage cavity 21 of a storage hopper 2, an injection molding system is started, the materials in the first storage cavity 21 enter an inlet of a material conveying channel 111 through a feed inlet 12 under the action of gravity, a driving piece 5 drives a feeding screw rod 4 to rotate around the axis of the feeding screw rod 4, so that the materials are conveyed from the inlet of the material conveying channel 111 to an outlet of the material conveying channel 111, in the process, a heating piece 6 heats a first material barrel 1 to be more than 100-150 ℃, the materials cling to the inner wall of the first material barrel 1 under the action of the feeding screw rod 4 and do spiral circular motion, the time of clinging to the first material barrel 1 is long, heat is efficiently collected, full and uniform heating of the materials is realized, then the materials sequentially enter a second storage cavity 31 of a discharge bin 3 through a discharge port 13, water vapor carried by the materials is timely discharged through a steam discharge hole 34, the materials in the second storage cavity 31 are conveyed downwards along a buffer channel 311 under the action of gravity, finally, the dried granular material can be continuously supplemented into the feeding channel 812 of the injection molding machine 8 through the discharging hole 33, on one hand, the effect of instant use is achieved, on the other hand, the granular material is discharged from the discharging hole 33 and carries residual heat, and the residual heat can be used in the subsequent plasticizing process (performed in the injection molding machine 8), so that the utilization rate of energy is improved.

Claims (10)

1. The utility model provides a drying equipment of granular material which characterized in that: comprises a storage hopper (2), a first charging barrel (1), a feeding screw (4) and a driving piece (5) for driving the feeding screw (4) to rotate around the axis of the feeding screw; the first charging barrel (1) is provided with an inner cavity (11) extending along the axial direction of the first charging barrel, the storage hopper (2) is communicated with the inner cavity (11), the feeding screw (4) is arranged in the inner cavity (11), and the rotation of the feeding screw (4) can enable the material entering the first charging barrel (1) to move towards the discharge hole (13) of the first charging barrel (1); the device also comprises a heating element (6) arranged on the periphery of the first charging barrel (1) and used for heating the material moving in the first charging barrel (1).

2. An apparatus for drying particulate material according to claim 1, wherein: the device is characterized by further comprising a discharging bin (3) communicated with a discharging hole (13) of the first charging barrel (1), wherein the discharging bin (3) is provided with a steam discharging hole (34) and a discharging hole (33).

3. An apparatus for drying particulate material according to claim 2, wherein: the discharging bin (3) is internally provided with a buffer channel (311) extending in a bending way.

4. An apparatus for drying particulate material according to claim 3, wherein: go out the feed bin (3) and be equipped with two piece at least guide plates (35) of interval arrangement from top to bottom, the head of two adjacent guide plates (35) is located respectively go out on feed bin (3) two relative inside walls, each guide plate (35) reduce gradually and the afterbody has the clearance with the inside wall that goes out feed bin (3) from the head to the afterbody to form in feed bin (3) buffering passageway (311).

5. An apparatus for drying particulate material according to claim 1, wherein: and a temperature sensor (15) is arranged on the first charging barrel (1) and used for monitoring the temperature of the material in the first charging barrel (1).

6. An apparatus for drying particulate material according to claim 1, wherein: sensors for monitoring the height of materials in the discharging bin (3) are arranged in the discharging bin (3).

7. An apparatus for drying particulate material according to claim 6, wherein: the sensors comprise a first sensor (32a) and a second sensor (32b) which are respectively arranged at the upper part and the lower part of the discharging bin (3).

8. An apparatus for drying particulate material according to claim 1, wherein: the heating element (6) comprises at least two heating rings (61) which are arranged along the axial direction of the first charging barrel (1) at intervals, and each heating ring (61) is sleeved on the periphery of the first charging barrel (1).

9. An apparatus for drying particulate material according to claim 1, wherein: the heating device is characterized by further comprising a heat insulation sleeve (7), wherein the heat insulation sleeve (7) is sleeved on the periphery of the heating element (6).

10. An injection molding system, comprising: comprising a drying device according to any one of claims 1 to 9 and an injection molding machine (8), the injection molding machine (8) comprising a second cylinder (81) having an extrusion chamber (811) and an extrusion screw (82) arranged in the extrusion chamber (811), the second cylinder (81) being in communication with the discharge bin (3), the feed screw (4) and the extrusion screw (82) having different axes and operating independently of each other.

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