The heating unit and its control method of a kind of laminating machine
Technical field
The present invention relates to hot pressing processing technique field, the heating unit and its control method of especially a kind of laminating machine.
Background technology
Laminating machine is widely used in the fitting encapsulation of various plate materials.The temperature uniformity of its heating plate produces encapsulation
The quality of product has direct influence.If non-uniform temperature, it may appear that local problem of expanding with heat and contract with cold, cause to occur bubble,
The problems such as bending is even broken.In the prior art, the higher heating plate of temperature uniformity in order to obtain, generally using high-temperature heat-conductive
Coil pipe of the oil in heating plate, which is circulated, heats heating plate.But due to conduction oil heating board memory exist
Heat fade causes heat conductive oil inlet temperature to be unable to reach with outlet temperature consistent, so that the temperature difference of heating plate can not reduce
To 0.7 DEG C/㎡ hereinafter, foring the technical bottleneck of laminating machine.
Invention content
The technical problem to be solved in the present invention is to provide the heating units and its control method of a kind of laminating machine, can solve
The deficiencies in the prior art further reduced the temperature difference of laminator heating device.
In order to solve the above technical problems, the technical solution used in the present invention is as follows.
A kind of heating unit of laminating machine including shell, is arranged in parallel with three layers of heating tube, the heating tube of top layer in shell
Be symmetrical arranged with the heating tube of bottom, the heating tube of middle layer is staggered with the heating tube of its both sides, middle layer it is adjacent
There are one temperature sensors for setting between two heating tubes, and shell is interior filled with heat conduction silicone, and heat conduction silicone is located at top layer
The position of heating tube and bottom heating tube is provided with arc groove, and top layer heating tube and bottom heating tube are located at arc groove, add
Heat pipe includes the outer tube and inner sleeve that are arranged concentrically, is set between outer tube and inner sleeve filled with conduction oil, the inside of inner sleeve
It is equipped with electric heating wire.
It is arranged in parallel preferably, the electric heating wire in the inner sleeve is divided into several sections, all electric heating wires are divided into two
Group, two groups of electric heating wires alternate setting in inner sleeve, are mutually parallel with the electric heating wire in group, adjacent electric heating wire
Axis angle for 13 ° 28 ', adjacent electric heating wire partly overlaps in the radial direction inner sleeve, lap account for electricity plus
The 20% of heated filament total length.
Preferably, the outer wall that the inner wall of the outer tube is provided with the first thermometal heat-conducting layer inner sleeve is provided with
Two thermometal heat-conducting layers are provided with heat conductive insulating elasticity between the first thermometal heat-conducting layer and the second thermometal heat-conducting layer
Rubber layer, the coefficient of thermal expansion of the first thermometal heat-conducting layer are more than the coefficient of thermal expansion of the second thermometal heat-conducting layer.
Preferably, several recessed portions, the second thermometal are evenly arranged on the first thermometal heat-conducting layer
Be provided on heat-conducting layer with the one-to-one lug boss of recessed portion, hard metal stent is connected between recessed portion and lug boss.
Preferably, the temperature sensor, between top layer heating tube and middle layer heating layer, temperature sensor is extremely
The ratio of distances constant of the distance of plane residing for top layer heating tube and plane residing for temperature sensor to middle layer heating tube is 1:2.
Preferably, the flow section of the conduction oil and the distance between flow section and heating tube liquid feeding end satisfaction
Following functional relation,
Wherein, k1~k3For proportionality constant, L is the distance between flow section and heating tube liquid feeding end, and s is flow section
Product.
It is preferably, described.
Preferably, the junction of the third pump housing and first flow valve is provided with oven wire mesh blanket.
A kind of control method of the heating unit of above-mentioned laminating machine, includes the following steps:
A, temperature sensor measures the temperature in shell, and conduction oil oil temperature is adjusted, and makes heating tube import
The temperature at place is controlled in setting value;
B, temperature sensor measures the temperature of remaining position, and measurement result is carried out curve fitting, and obtains temperature
Change curve;
C, the electric heating wire in each heating tube is according to the temperature value and setting value on the temperature curve of heating tube present position
Difference carry out heat temperature raising, the heating temperature of electric heating wire higher than setting value, the heating temperature of electric heating wire and setting value
Difference is equal with the difference of setting value with temperature value on the temperature curve of corresponding position;
D, after electric heating wire heating, the heating temperature of electric heating wire is carried out according to the temperature change that temperature sensor measures
It adjusts in real time;
Electric heating wire in top layer heating tube and bottom heating tube is measured according to two temperature sensors away from nearest neighbours
Temperature change be adjusted, adjusting process follows following functional relation,
;
Middle layer heating tube is adjusted according to the temperature change that the temperature sensor of its both sides measures, and adjusting process follows
Following functional relation,
;
Wherein t1For the rate of temperature change of the temperature sensor with the larger side of setting value gap, t2For with setting value gap
The rate of temperature change of the temperature sensor of smaller side, k4~k7For proportionality constant, T is that the temperature of electric heating wire adjusts variable quantity;
E, after electric heating wire carries out heating compensation, by adjusting heat conduction oil flow rate, heating tube entrance temperature is occurred
Fluctuation carries out second compensation adjusting, reduces the stability bandwidth of entire heating unit temperature.
It is using advantageous effect caused by above-mentioned technical proposal:The present invention is by the way that conduction oil and electrical heating are had
The combination of machine supplements heat-conducting oil heating system by electrical heating, to temperature damping present in heat-conducting oil heating system
The problem of carry out effectively temperature-compensating.The layout stracture of heating tube can effectively improve the distribution consistency degree of thermal field.Different positions
The heating temperature that the electric heating wire put carries out different modes according to the measurement result of temperature sensor adjusts, the temperature of electric heating wire
Adjustment is adjusted the elastic shape deformation of two layers of thermometal heat-conducting layer, and the elastic deformation of two layers of thermometal heat-conducting layer
Feedback interventions are carried out to the transmission efficiency of the calorific value of electric heating wire simultaneously, so as to reduce electric heating wire for heat-conducting oil heating
Hysteresis quality, improve the temperature uniformity of entire heating unit, create a further reduction the temperature difference.
Description of the drawings
Fig. 1 is the structure chart of a specific embodiment of the invention.
Fig. 2 is the structure chart of inner sleeve in a specific embodiment of the invention.
Fig. 3 is the partial cutaway view of heating tube in a specific embodiment of the invention.
In figure:1st, shell;2nd, temperature sensor;3rd, heat conduction silicone;4th, arc groove;5th, outer tube;6th, inner sleeve;7、
Electric heating wire;8th, the first thermometal heat-conducting layer;9th, the second thermometal heat-conducting layer;10th, heat conductive insulating elastic rubber layer;11、
Recessed portion;12nd, lug boss;13rd, hard metal stent;14th, thermal conductive metal plate;15th, sliding sleeve;16th, supporting rod.
Specific embodiment
The standardized element used in the present invention can commercially, and shaped piece is according to specification and attached drawing
Record can carry out customized, and the specific connection mode of each part is using bolt ripe in the prior art, rivet, weldering
The conventional means such as connect, paste, this will not be detailed here.
With reference to Fig. 1-3, one specific embodiment of the present invention includes shell 1, and three layers of heating are arranged in parallel in shell 1
Pipe, the heating tube of top layer and the heating tube of bottom are symmetrical arranged, and the heating tube of middle layer is staggered with the heating tube of its both sides,
There are one temperature sensors 2 for setting between adjacent two heating tube of middle layer, and shell 1 is interior filled with heat conduction silicone 3, leads
Hot layer of silica gel 3 is located at top layer heating tube and the position of bottom heating tube is provided with arc groove 4, top layer heating tube and bottom heating
Pipe is located at arc groove 4, and heating tube includes the outer tube 5 that is arranged concentrically and inner sleeve 6, between outer tube 5 and inner sleeve 6 filled with
Conduction oil, inner sleeve 6 are internally provided with electric heating wire 7.Electric heating wire 7 in inner sleeve 6 divides to be arranged in parallel for several sections, institute
It is two groups to have electric heating wire 7 to be divided to, and two groups of electric heating wires 7 alternate setting in inner sleeve 6, with 7 phase of electric heating wire in group
Mutually parallel, the axis angle of adjacent electric heating wire 7 is 13 ° 28 ', adjacent electric heating wire 7 in inner sleeve 6 in the radial direction
It partly overlaps, lap accounts for the 20% of 7 total length of electric heating wire.The inner wall of outer tube 5 is provided with the first thermometal heat-conducting layer
8, the outer wall of inner sleeve 6 is provided with the second thermometal heat-conducting layer 9, and the first thermometal heat-conducting layer 8 and the second thermometal are led
Heat conductive insulating elastic rubber layer 10 is provided between thermosphere 9, the coefficient of thermal expansion of the first thermometal heat-conducting layer 8 is more than the second heat
The coefficient of thermal expansion of sensitized metal heat-conducting layer 9.It is evenly arranged with several recessed portions 11 on first thermometal heat-conducting layer 8, second
Be provided on thermometal heat-conducting layer 9 with 11 one-to-one lug boss 12 of recessed portion, connect between recessed portion 11 and lug boss 12
It is connected to hard metal stent 13.Temperature sensor 2 between top layer heating tube and middle layer heating layer, temperature sensor 2 to
The ratio of distances constant of the distance of plane residing for top layer heating tube and plane residing for temperature sensor 2 to middle layer heating tube is 1:2.
The flow section of conduction oil meets following functional relation with the distance between flow section and heating tube liquid feeding end,
Wherein, k1~k3For proportionality constant, L is the distance between flow section and heating tube liquid feeding end, and s is flow section
Product.
In addition, thermal conductive metal plate 14 is provided through on inner sleeve 6, top and the lug boss 12 of thermal conductive metal plate 14
Top be fixedly connected, setting is slided on thermal conductive metal plate 14 there are two sliding sleeve 15, supporting rod 16 is hinged on sliding sleeve 15, is supported
The top slide of bar 16 is crimped on lug boss 12.Thermal conductive metal plate 14 changes the second thermometal heat conduction by direct heat transfer
The deformation quantity of 9 part of layer can effectively reduce the nonlinearity of temperature transmittance process.
A kind of control method of the heating unit of above-mentioned laminating machine, includes the following steps:
A, temperature sensor 2 measures the temperature in shell 1, and conduction oil oil temperature is adjusted, make heating tube into
Temperature at mouthful is controlled in setting value;
B, temperature sensor 2 measures the temperature of remaining position, and measurement result is carried out curve fitting, and obtains temperature
Change curve;
C, the electric heating wire 7 in each heating tube is according to the temperature value and setting value on the temperature curve of heating tube present position
Difference carry out heat temperature raising, the heating temperature of electric heating wire 7 is higher than setting value, the heating temperature and setting value of electric heating wire 7
Difference it is equal with the difference of setting value with temperature value on the temperature curve of corresponding position;
D, after electric heating wire 7 heats, according to the temperature change that temperature sensor measures to the heating temperature of electric heating wire 7 into
Row is adjusted in real time;
Electric heating wire 7 in top layer heating tube and bottom heating tube is measured according to two temperature sensors away from nearest neighbours
Temperature change be adjusted, adjusting process follows following functional relation,
;
Middle layer heating tube is adjusted according to the temperature change that the temperature sensor of its both sides measures, and adjusting process follows
Following functional relation,
;
Wherein t1For the rate of temperature change of the temperature sensor with the larger side of setting value gap, t2For with setting value gap
The rate of temperature change of the temperature sensor of smaller side, k4~k7For proportionality constant, T is the temperature adjustment variation of electric heating wire 7
Amount;
E, after electric heating wire 7 carries out heating compensation, by adjusting heat conduction oil flow rate, heating tube entrance temperature is occurred
Fluctuation carries out second compensation adjusting, reduces the stability bandwidth of entire heating unit temperature.
In addition, in step C, two groups of electric heating wires 7 in same inner sleeve 6 alternately open heating.This mode of heating
The loopy moving in temperature field can be formed in inner sleeve, so as to reduce by two opposite amount of elastic deformation of thermometal heat-conducting layer
Hysteresis quality.
The temperature difference of laminating machine can be reduced to below 0.25 DEG C/㎡ by the present invention.
The basic principles, main features and the advantages of the invention have been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.