CN1076400A - Gas profiling method and program-controlled rotational forming machine thereof - Google Patents

Abstract

A kind of large scale plastic product gas profiling method and program-controlled rotational forming machine thereof.Programmable controller controls is a series of props up the burner valve group duty that the different automatic valve of latus rectum is formed in parallel by n, container type plastic products mould to rotation provides imitative type heating intensity, has successfully solved the processing problems of large scale plastic product (as all-plastic boat, overall plastic room, overall plastic car shell etc.).The rotation of mould and swing, the heating intensity of each burner, main operation programs such as air-supply cooling are finished automatically by controller control.

Description

Gas profiling method and program-controlled rotational forming machine thereof

The present invention relates to a kind of large scale plastic product gas profiling method and program-controlled rotational forming machine thereof.

Produce large scale plastic product at present both at home and abroad and generally adopt rotational molding technology, rotational molding technology can be divided into closed rotational forming by its mode of heating, the directly-firing rotational forming.

Though closed rotational forming thermal efficiency height, labour intensity is low, good product consistency, and the equipment manufacturing cost costliness, and also only can machining shape simple, the uniform column plastic products of thickness.

The directly-firing rotational forming, equipment manufacturing cost is lower, practicable manual intervention in heating process, promptly additionally heat with the privileged sites of artificial hand-held auxiliary burner to processed goods, thereby controlled the thickness at these positions of goods indirectly, but the large scale plastic product of machining shape complexity in theory, but the most outstanding shortcoming of directly-firing rotational forming is the operator to be placed oneself in the midst of under the hot environment more than 60 ℃ and works, labour intensity is big, and the output and the quality of product are had a strong impact on.

The objective of the invention is to overcome weak point in the prior art, and a kind of large scale plastic product gas profiling method and program-controlled rotational forming machine thereof are provided.

The large scale plastic product gas profiling method, at first with molding powder, colouring agent, additives etc. join in the container type mould that metallic plate makes, closed mould, the lifting mould, mould is installed on the large-scale rotary forming machine, start the mould rotating motor, mould rotated after t1 minute, the combustion system of being made up of burner begins mould lower surface and the heating of mould two sides, after mold heated t2 minute, the swing platform around with the perpendicular axle swing of mold axis, the full swing angle is ± 35 °, the swing of swing platform is after t3 minute, the raw material plasticizing finishes, mold heated stops, after mold heated stops t4 minute, start fan electromotor, the mould lower surface is cooled off, after mold cools down t5 minute, the swing platform stops swinging, the position restores balance, after the swing platform stopped swinging t6 minute, mould rotating motor and fan electromotor stop, mould is hung rotary forming machine, the demoulding, take out large scale plastic product, it is characterized in that the mould rotating motor, swing platform wobbling motor, fan electromotor, form burner heating intensity Q and time t1 with the corresponding to profiling thermal current of large scale plastic product contour curve, t2, t3, t4, t5, t6 is all by programmable controller and peripheral components control thereof.Prop up one group of burner valve group that the different automatic valve of latus rectum composes in parallel by n and can have 2 ⁿPlant duty.

One group of burner valve being made up of automatic valve consists of the thermal current automatic heater, can have 2 ⁿPlant duty, the various combination of automatic valve group, can be in the overall process of large scale plastic product processing, theoretical design curve and thickness axial according to special-shaped plastic products and section are programmed, the automatic change in elevation of control burner flame, form the corresponding to profiling thermal current of the contour curve geometric locus that becomes with special-shaped plastic products mould section foveal reflex face with special-shaped plastic products mold axis, diverse location to the large scale plastic product of change of shape complexity, different geometries carries out desirable-auto processing, and unitary mould is heated by profiling track periphery.

In addition, to some privileged sites of large scale plastic product,, adopt automatic time delay compensation mode of heating as convex-concave garden arc transition portion.

Gas profiling method has successfully solved has the uniform theory design thickness, non-homogeneous theoretical design thickness, the problem that the large scale plastic product time processing of garden arc transition theory design thickness is shaped.

According to above-mentioned large scale plastic product gas profiling method, and the container type mould made by metallic plate of large-scale program-controlled rotational forming machine of design, swing platform, support, mould rotating mechanism, swing platform swing mechanism, combustion system, automatic control system are formed.It is characterized in that described combustion system is by 5 groups of burners that are installed in swing platform bottom, each one group of burner of swing platform both sides is formed, and each burner is by separately fuel gas pipeline, propping up the valve group that the different automatic valve of latus rectum is formed in parallel by n and form separately.

Automatic control system is by power unit; the importation; programmable controller; output; the display part is formed, the input of programmable controller and duty selector button, burner valve group state selector button; toggle switch; link near switch etc., with the general supply indication that the programmable controller output links, duty indication; the indication of burner valve group state; digital display is shut down, and igniting buzzer etc. constitutes the display part; the programmable controller output respectively with A.C. contactor, magnetic valve links.

Choose the representative characteristic cross section at mould, the peripheral curve of characteristic cross-section is divided into several sections, can calculate the time t1 of each curved section by each curved section to the angle of pivot by burner ... tn, because curve shape is irregular, so during each section curve negotiating burner, the vertical range s1 of each section curve and burner ... sn is unequal, suppose that each position of requirement mould is subjected to same heat, burner is at t1 so ... the tn different time will provide corresponding heating intensity Q1 ... Qn, just the heating intensity Q of burner is the function of time t, and this relational expression can be finished by this burner valve group state of programmable controller controls.

On the peripheral curve of characteristic cross-section, a starting point is set, utilizes, can eliminate the accumulated error that causes because of friction-driven like this near the input signal of switch as programmable controller.

The duty selector button that links with the programmable controller input, burner valve group state selector button, toggle switch, by nearly switch etc. as switching value, usually with Chang Kai or normally closed instruction type, be input in the programmable controller, with other restrictive conditions, carry out the programming of logic ladder, input signal is by the auxiliary relay of programmable controller inside, inner guard relay, internal timer removes to control A.C. contactor and the automatic valve that links with the programmable controller output, automatically finishes mould and rotates, the heating intensity of burner is the function of goods cross sectional shape and thickness, the swing of swing platform, the air-supply cooling shows operation programs such as warning.Large scale plastic product gas profiling method and program-controlled rotational forming machine thereof, successful solution complex-shaped, wall thickness has the processing problems of the large scale plastic product of specific (special) requirements, and to thousands of kilograms, finish automatically by programme-control by the main technical process of goods by tens of kilograms for the weight of plastic products.Improve the output of goods, guaranteed quality of item, reduced labour intensity, improved operating environment.This program-controlled rotational forming machine is reasonable in design, and especially by the different automatic valve of the n kind latus rectum valve block structure novelty that is formed in parallel, control has 2 flexibly ⁿIt is available to plant assembled state.

Fig. 1 a is large-scale rotary forming machine structural representation

Fig. 1 b is large-scale rotary forming machine flame-thrower nozzle and cooling air hole layout drawing

Fig. 2 is the schematic diagram that concerns of its corresponding burner heating intensity of the peripheral curved section of plastic products characteristic cross-section Q

Fig. 3 is a burner valve block structure schematic diagram

Fig. 4 is that burner flame change in elevation and large scale plastic product anglec of rotation ψ concern schematic diagram

Now the present invention is further illustrated in conjunction with the accompanying drawings.

With reference to Fig. 1 a, 1b

The container type mould 9 that metallic plate is made rotates under the effect of driving mechanism 2, swing platform 3 is at the effect lower swing of swing mechanism 5, maximum pendulum angle is ± 35 °, shape and wall thickness programming according to plastic products, by console 7 control be installed in 5 groups of burners 6 of swing platform 3 bottoms and be installed in swing platform 3 both sides each one group of burner 1,8 heating intensity Q and heat time heating time t, hang again at mould 9 inner surfaces formation article outer surface layer after making the plastic raw materials fusion in the mould 9, support 4 is supporting to be swung platform 3 and is installed in the driving mechanism of swinging on the platform 32, mould 9.Cooling air hole 11 is arranged in a linear at the upper surface of swing platform 3.

With reference to Fig. 2

Selected plastic products characteristic cross-section as shown in Figure 2, swivel becket 10 drives mould 9 rotations, t1 at a time, this burner flame nozzle is apart from the air line distance s1 of mold profile curve, the heating intensity that this burner provides is Q1, when swivel becket 10 rotates to another t2 constantly according to clockwise direction, the said burner flame-thrower nozzle is s2 apart from the air line distance of mold profile curve, suppose that each position of requirement mould is subjected to same heat, this burner is carved t2 at this moment the Q2 of heating intensity correspondingly will be provided so.

With reference to Fig. 3

Each burner can be formed in parallel by three different magnetic valves of latus rectum, control its heating intensity Q, magnetic valve a, b, c have eight kinds of duties, abc, abc, ab c, abc, a bc, a bc, ab c, the abc duty.

With reference to Fig. 4

Its cross section of large scale plastic product several characteristic point a, b, c are at shown position, distance to the burner flame nozzle is respectively Sa, Sb, Sc, when this cross section turns clockwise the π angle, can draw corresponding by figure last a, b, three curves of c apart from Sa ', Sb ', Sc '.

Claims (4)

1, a kind of large scale plastic product gas profiling method, with molding powder, colouring agent, additives etc. join in the container type mould that metallic plate makes, closed mould, mould is installed on the large-scale rotary forming machine, start the mould rotating motor, mould rotated after t1 minute, the combustion system of being made up of burner begins mould lower surface and the heating of mould two sides, after mold heated t2 minute, the swing platform around with the perpendicular axle swing of mold axis, the full swing angle is ± 35 °, the swing of swing platform is after t3 minute, the raw material plasticizing finishes, mold heated stops, after mold heated stops t4 minute, start fan electromotor, the mould lower surface is cooled off, after mold cools down t5 minute, the swing platform stops swinging, the position restores balance, after the swing platform stopped swinging t6 minute, mould rotating motor and fan electromotor stop, mould is hung rotary forming machine, the demoulding, take out large scale plastic product, it is characterized in that the mould rotating motor, swing platform wobbling motor, fan electromotor, form burner heating intensity Q and time t1 with the corresponding to profiling thermal current of large scale plastic product contour curve, t2, t3, t4, t5, t6 is all by programmable controller and peripheral components control thereof.

2, a kind of large scale plastic product gas profiling method according to claim 1 is characterized in that propping up one group of burner valve group that the different automatic valve of latus rectum composes in parallel by n can have 2 ⁿPlant duty.

3, a kind of application large scale plastic product gas profiling method as claimed in claim 1, and the large-scale program-controlled rotational forming machine that uses, it is the container type mould of being made by metallic plate, the swing platform, support, the mould rotating mechanism, swing platform swing mechanism, combustion system, automatic control system is formed, and it is characterized in that described combustion system is by 5 groups of burners that are installed in swing platform bottom, and each one group of burner of swing platform both sides is formed, every group of burner be by separately fuel gas pipeline, propping up the valve group that the different automatic valve of latus rectum is formed in parallel by n and form separately.

4; according to the described large-scale program-controlled rotational forming machine of claim 3; it is characterized in that automatic control system is by power unit; the importation; programmable controller, output, the display part is formed; the input of programmable controller and duty selector button; burner valve group state selector button, toggle switch links near switch etc.; indicate with the general supply that the programmable controller output links; the duty indication, the indication of burner valve group state, digital display; shut down; the igniting buzzer constitutes the display part, the programmable controller output respectively with A.C. contactor, automatic valve links.

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