阅读说明：本技术 一种连续挤出高节能正负压热成型机构 (Continuous extrusion high-energy-saving positive and negative pressure thermal forming mechanism ) 是由 刘秋明 刘杰 于 2019-10-16 设计创作，主要内容包括：本发明提供一种连续挤出高节能正负压热成型机构,具有成型机构,还包括位于恒温辊组与送片链轨之间的浮动储料辊,由挤出机所挤出的片材依次经过恒温辊组、浮动储料辊、送片链轨,通过送片链轨带动进入成型机构中成型；浮动储料辊为数控电动辊并配有升降机构,浮动储料辊具有温度控制装置。在成型机构合模工作时,浮动储料辊上升或下降进行储料；在成型机构分离脱模时,浮动储料辊下降或上升配合供料,实现挤出机不间断供料,形成流水线生产模式。确保片材成型均匀,能适应制品用片厚度为0.2-4mm的片材,且正压成型透明度好,另外节省加温炉结构,可降低能耗50%以上,同时节省人工及场地,所得产品质量好,范围广,成本更低。(The invention provides a continuous extrusion high-energy-saving positive and negative pressure thermal forming mechanism, which is provided with a forming mechanism and also comprises a floating storage roller positioned between a constant temperature roller set and a sheet feeding caterpillar track, wherein a sheet extruded by an extruder sequentially passes through the constant temperature roller set, the floating storage roller and the sheet feeding caterpillar track and is driven by the sheet feeding caterpillar track to enter the forming mechanism for forming; the floating storage roller is a numerical control electric roller and is provided with a lifting mechanism, and the floating storage roller is provided with a temperature control device. When the forming mechanism is matched with the mold to work, the floating material storage roller ascends or descends to store materials; when the forming mechanism is separated and demoulded, the floating material storage roller descends or ascends to match with feeding, so that uninterrupted feeding of the extruder is realized, and a production line production mode is formed. The sheet material is ensured to be uniformly formed, the sheet material can adapt to the sheet material with the thickness of 0.2-4mm for products, the positive pressure forming transparency is good, in addition, the structure of a heating furnace is saved, the energy consumption can be reduced by more than 50%, meanwhile, the labor and the field are saved, the quality of the obtained product is good, the range is wide, and the cost is lower.)

1. The utility model provides a extrude energy-conserving positive negative pressure thermoforming mechanism in succession, has forming mechanism (8), its characterized in that: the automatic film feeding device is characterized by comprising a floating storage roller (3) which is located between a constant temperature roller set (1) and a film feeding caterpillar track (2), wherein the floating storage roller (3) is provided with a servo motor and a lifting mechanism (4), and the floating storage roller (3) is provided with a temperature control device.

2. The continuous extrusion high-energy-saving positive-negative pressure thermoforming mechanism as claimed in claim 1, wherein: and first cold edge wheels (31) are arranged on two sides above the floating storage roller (3).

3. The continuous extrusion high-energy-saving positive-negative pressure thermoforming mechanism as claimed in claim 1, wherein: and second cold edge wheels (21) are arranged on two sides of the starting end of the piece feeding caterpillar track (2).

4. A continuous extrusion high energy saving positive and negative pressure thermoforming mechanism as claimed in claim 1 or 2 or 3, wherein: and third cold edge wheels (11) are arranged on two sides of the upper part and the lower part of the constant temperature roller group (1).

5. The continuous extrusion high-energy-saving positive-negative pressure thermoforming mechanism as claimed in claim 1, wherein: the starting end of the piece-feeding caterpillar track (2) is also provided with an auxiliary heater (5).

6. The continuous extrusion high-energy-saving positive-negative pressure thermoforming mechanism as claimed in claim 1, wherein: the lifting mechanism (4) adopts a ball screw structure.

Technical Field

The invention relates to the technical field of sheet thermoforming, in particular to a continuous extrusion high-energy-saving positive and negative pressure thermoforming mechanism.

Background

The positive and negative pressure hot forming mechanism usually adopts a process mode that a roll type sheet is unreeled, heated and softened and then subjected to positive and negative pressure forming, at the present stage, the positive pressure forming mechanism cannot realize continuous production, while the negative pressure forming mechanism can realize continuous production, but actually depends on the movement of a mould table, and the negative pressure forming mechanism continuously returns and returns to form negative pressure in the transmission process of the sheet, and the negative pressure forming mechanism which depends on the movement of the mould table cannot be provided with the positive pressure mechanism, has large limitation, and cannot realize positive and negative pressure continuous production.

Among the current thermoforming mechanism, adopt the roll type sheet feed still to need to change the coil stock, and generally need dispose the stove of heating to cold sheet heating, make the sheet soften and do benefit to the shaping, the required energy consumption of hot to cold like this is very high, not only needs a section of stove of heating of considerable length, and need continuously provide the temperature, makes the sheet can reach the shaping temperature through this region, and not only the power consumption is high, and equipment is bulky, and area is wide.

Adopt the in-process of the direct butt joint feed of extruder, the unsettled department that softened sheet can be between two deflector rolls produces the deformation because of the dead weight, if the sheet thickness that adopts is great, then the deformation degree is higher, and the product that forms is extremely inhomogeneous, can't guarantee product quality, and product specification receives the restraint.

Disclosure of Invention

The invention aims to provide a positive and negative pressure forming mechanism capable of continuously feeding and producing aiming at the prior technical situation, so that the positive and negative pressure integrated continuous hot forming is realized, the advantages of high efficiency, low energy consumption and the like are achieved, the forming thickness of a sheet can be increased, and the requirement of customers on product specifications is met.

In order to achieve the purpose, the invention adopts the following technical scheme:

a high energy-saving positive and negative pressure thermoforming mechanism for continuous extrusion comprises a thermoforming mechanism and a floating storage roller positioned between a constant temperature roller set and a sheet feeding caterpillar track, wherein a sheet extruded by an extruder sequentially passes through the constant temperature roller set, the floating storage roller and the sheet feeding caterpillar track and is driven by the sheet feeding caterpillar track to enter the thermoforming mechanism for thermoforming; unsteady storage roller disposes servo motor and elevating system, and unsteady storage roller has temperature control device, can provide storage, feed to and make the sheet temperature stable at the storage feeding in-process through temperature control device. When the forming mechanism is matched with the mold to work, the floating material storage roller ascends or descends to store materials; when the forming mechanism is separated and demolded, the sheet feeding caterpillar tracks pull the sheets, the floating storage roller descends or ascends to cooperate with feeding until the sheet feeding caterpillar tracks stop pulling, and when the forming mechanism performs secondary mold closing work, the floating storage roller ascends or descends again to store the materials, so that the extruder can continuously feed the materials, and an efficient and assembly line production mode is formed.

Among the above-mentioned scheme, heat preservation and send out the sheet pressurization according to the required thickness of sheet to the constant temperature roller set, carry out the storage through unsteady storage roller to and rely on the speed of unsteady storage roller and elevating system's speed ratio, keep the stability of sheet in storage and feed in-process thickness, for the convenience draws storage or feed, the both sides of unsteady storage roller top dispose first cold edge wheel.

Furthermore, second cold edge wheels are arranged on two sides of the starting end of the sheet feeding caterpillar track and used for cooling two sides of the sheet, and traction and transmission are facilitated.

Furthermore, third cold edge wheels are arranged on two sides of the upper portion and the lower portion of the constant temperature roller group and used for cooling two sides of the sheet, and traction and transmission are facilitated.

Furthermore, an auxiliary heater is arranged at the initial end of the sheet feeding caterpillar track, so that the sheet can keep a stable forming temperature in the process from extrusion to forming.

Preferably, the lifting mechanism adopts a ball screw structure.

Furthermore, the device also comprises a discharging manipulator which is used for clamping and taking the product to output.

Furthermore, a conveyer belt is arranged below the discharging manipulator.

The invention has the beneficial effects that:

1. compared with the traditional negative pressure forming mechanism or positive pressure forming mechanism, the invention can really realize the integral continuous hot forming of positive pressure and negative pressure, the sheet can be continuously transmitted in a heat preservation state after being extruded, and the hot forming can select three modes of positive pressure, negative pressure and positive pressure and negative pressure according to the requirement.

2. The floating material storage roller is adopted to realize butt joint of the forming mechanism and the extruding mechanism, the floating material storage roller can store and feed materials uninterruptedly and provide temperature compensation, the materials are extruded to the forming thickness and then reach the floating material storage roller, so that the sheet material reaches the proper forming temperature, and the uniform and transparent forming of the product is ensured through the matching mould of the machine table of the positive and negative pressure forming mechanism, the whole production process is coherent and ordered, the production efficiency of the product can be effectively improved, and the production cost is reduced;

3. compared with the traditional thermal forming mechanism, the heat preservation energy consumption of the sheet from extrusion to forming has obvious reduction amount compared with the energy consumption of the sheet from cold material heating to forming temperature, the power consumption can be reduced by at least more than 50 percent and even can reach 60 percent, and a large heating furnace is not required to be configured, so that the equipment volume can be reduced, and the field and labor cost can be saved;

4. the floating material storage roller is adopted for preferably storing materials from the horizontal position to the upper part, feeding is realized from the top to the lower part, so that the sheets are transferred in a convex shape, the ratio of the rotating speed of the floating material storage roller to the vertical lifting speed of the lifting mechanism is adjusted according to the thickness of the sheets, the sheets can keep uniform thickness in the material storage and feeding processes, and meanwhile, the sheets are attached to the floating material storage roller by the dead weight of the sheets to move, so that the deformation error is greatly reduced, and the accuracy of the thickness of the sheets is improved;

5. the cooling rollers are adopted to cool the two sides of the heating and softening mechanism, so that the cooling of the two sides of the sheet is facilitated, certain rigidity can be kept, and the sheet is transferred more smoothly;

6. the product is ejected out after the forming mechanism is separated from the mold, the product is further clamped and pulled out by a manipulator, and the product can be output or stacked and output by combining a conveying belt.

Description of the drawings:

FIG. 1 is a schematic structural diagram of the present invention.

The specific implementation mode is as follows:

referring to fig. 1, a schematic structural diagram of a preferred embodiment of the present invention is shown, the present invention is a continuous extrusion high energy-saving positive and negative pressure thermoforming mechanism, which has an extruder 9 and a forming mechanism 8, a sheet extruded by the extruder 9 enters a sheet feeding caterpillar track 2 through a constant temperature roller set 1, and is conveyed by the sheet feeding caterpillar track 2 into the forming mechanism 8, and the forming mechanism 8 is a positive and negative pressure integral forming mechanism, which can realize three modes of positive pressure, negative pressure or positive and negative pressure.

In order to realize positive and negative pressure continuous production, the problem of continuous material storage and feeding of a positive and negative pressure hot forming mechanism is required to be solved, the deformation generated in the sheet material transfer process is reduced, and the accuracy of sheet material thickness control is improved.

In the working process, when the forming mechanism 8 is used for die assembly, the floating material storage roller 3 rises or falls for material storage; when the forming mechanism 8 is separated and demolded, the sheet feeding caterpillar track 2 pulls the sheet, the floating storage roller 3 descends or ascends to supply materials in a matched mode until the sheet feeding caterpillar track 2 stops pulling, and when the forming mechanism 8 carries out secondary die assembly work, the floating storage roller 3 ascends or descends again to store materials, and the like.

Specifically, the floating storage roller 3 is provided with a servo motor to control the speed change, and can pull the sheet in the storage process, so that the floating storage roller 3 can transfer the sheet in the process of keeping the transverse position unchanged; the lifting mechanism 4 adopts a ball screw structure for transmission, so that the floating storage roller 3 can stably move longitudinally, when the sheet conveying caterpillar track 2 does not pull materials, the servo motor is matched with the lifting mechanism 4 to continuously pull the sheets, the sheets are slowly protruded upwards or sunken downwards for storing the materials through the longitudinal movement of the floating storage roller 3, in the process, the rotating speed of the floating storage roller 3 is matched with the lifting speed of the lifting mechanism 4 by the speed control of the servo motor, the softened sheets can not be easily deformed in the storing and feeding processes, the uniformity of the thickness of the sheets in the transmission process is kept, the uniformity of the thickness of the sheets can be ensured only by adjusting the ratio of the rotating speed of the servo motor and the vertical movement speed of the lifting mechanism 4, and the uniform thickness of the sheets belongs to parameter and process configuration regulation and control, and control can be obtained by a person skilled in the art through experiments.

After the forming mechanism 8 finishes the previous round of work, the sheet feeding caterpillar track 2 pulls the sheet again, the floating storage roller 3 resets in a follow-up mode, the sheet finally enters the sheet feeding caterpillar track 2 in a horizontal state, when the forming mechanism 8 works again, the sheet feeding caterpillar track 2 stops pulling, the floating storage roller 3 longitudinally moves again to store the sheet, and therefore the sheet can be butted with the extruder 9, the extruder 9 can continuously feed the sheet, the sheet extrusion is not interrupted, the sheet coil material does not need to be replaced, the production efficiency is greatly improved, the sheet does not need to be cooled or heated repeatedly, a heating furnace end does not need to be configured, the size is small, and the energy saving rate can reach more than 50%.

When the ascending storage is adopted, the sheet gradually protrudes upwards to be accumulated, the sheet can be attached to the floating storage roller 3 to move due to dead weight, the material is stored in the moving process, the material is fed in the moving process all the time, the sheet is in a downward inclined state after passing through the floating storage roller 3, the sheet is actually pulled upwards by the floating storage roller 3, the dead weight acting force of part of the sheet can be offset, and in addition, the proportion of the speed control of the servo motor to the floating storage roller 3 and the lifting speed of the lifting mechanism 4 is increased, so that the deformation is not easy to occur, the thickness of the sheet can be well controlled, the material pressing roller can be additionally arranged above the floating storage roller 3 in the mode, and the thickness of the sheet is further controlled. The first cold edge wheels 31 are arranged on two sides above the floating storage roller 3, so that two sides of the sheet are cooled and solidified, certain rigidity is achieved, and transmission is facilitated.

When the descending material storage is adopted, the sheets are gradually sunken and accumulated, the floating material storage roller 3 plays a tensioning role more, an upper pressing roller can be additionally arranged below the floating material storage roller 3 in the mode to further control the thickness of the sheets, but the part of the sheets passing through the floating material storage roller 3 is in an inclined ascending state and is actually in a state of being pulled down by the floating material storage roller 3, and the self-weight factor is added, so that the sheets are still in continuous movement for material storage or material supply, the deformation with a small amplitude is still easy to generate, and the thickness control effect is still weaker than that of the ascending material storage mode.

Therefore, through many tests, the floating material storage roller 3 adopts a rising material storage and falling material supply mode, and the effect is far better than that of the falling material storage and rising material supply mode.

The material that the sheet chose for use can be ABS, PP, HIPS, PVC, biodegradable material, calcium carbonate fill modified PP material, and sheet thickness can realize accurate control in 0.3mm-4 mm's scope, adopts this embodiment can greatly promote the selection range of product specification, satisfies customer's demand.

Send piece caterpillar track 2 top's both sides to dispose second cold side wheel 21, constant temperature roller set 1 both ends dispose third cold side wheel 11, can keep sheet both sides to have the rigidity in transmission process, and the centre softens, maintains under the shaping temperature prerequisite in the middle of guaranteeing the sheet, cools off sheet both sides temperature, makes its transmission of being convenient for, can improve sheet transmission smoothness nature and stability.

The start end of the piece feeding caterpillar track 2 is also provided with an auxiliary heater 5, the auxiliary heater 5 is arranged above the piece feeding caterpillar track 2, the size is small, the occupied space is small, auxiliary heating is provided, energy consumption is low, sufficient softening degree of a sheet forming part can be further ensured, and the forming mechanism 8 is favorable for forming.

In addition, this embodiment is for getting the material conveniently, still include ejection of compact manipulator 6 and be used for pressing from both sides the product output, after 8 work completions of forming mechanism and open the mould, lower mould cylinder or servo ejection of products, then manipulator 6 can the level insert 8 middle sections of forming mechanism, press from both sides the product and draw out after getting, sheet slitter edge accessible winding mechanism 10 after the while shaping is collected, and ejection of compact manipulator 6 below disposes conveyer belt 7, manipulator 6 presss from both sides and send the product to move down and place on conveyer belt 7, can further accomplish and pile up the seeing off.

It should be understood that the above-mentioned drawings are merely illustrative of the preferred embodiments of the present invention, and that the scope of the invention is not limited thereto.