CN114720045A - Method and device for online testing internal steam pressure in hot pressing process of recombined bamboo - Google Patents
Method and device for online testing internal steam pressure in hot pressing process of recombined bamboo Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/04—Means for compensating for effects of changes of temperature, i.e. other than electric compensation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/08—Means for indicating or recording, e.g. for remote indication
- G01L19/083—Means for indicating or recording, e.g. for remote indication electrical
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Abstract
The invention discloses an internal steam pressure online testing device in a recombined bamboo hot-pressing process, which comprises a steam leading-out metal pipe, a pressure sensor and a data recorder which are connected in sequence, wherein the front end of the steam leading-out metal pipe extends into a recombined bamboo hot-pressing plate blank and is provided with a steam inlet communicated with the outside, the rear end of the steam leading-out metal pipe is connected with the pressure sensor, and the outer peripheral wall of the steam leading-out metal pipe, which does not extend into the recombined bamboo hot-pressing plate blank, and the outer peripheral wall of the pressure sensor are provided with temperature compensation devices. The invention also discloses a test method of the test device, and the test device has the advantages of accurate and effective test result in hot pressing.
Description
Technical Field
The invention relates to the field of recombined bamboo hot pressing, in particular to an online testing method and device for internal steam pressure in a recombined bamboo hot pressing process.
Background
The recombined bamboo is a plate or a square timber pressed by taking bamboo bundles as basic units, has the advantages of high utilization rate of bamboo, high mechanical strength of products, strong weather resistance, good decorative effect and the like, and greatly expands the processing and utilization approaches and additional values of bamboo resources. The main preparation process of the recombined bamboo comprises the following steps: defibering bamboo wood to obtain bamboo bundles, sequentially drying the bamboo bundles, performing high-temperature heat treatment, soaking in water-soluble phenolic resin (PF), performing secondary drying, performing grain-following assembly, and finally performing hot press forming. The hot pressing is a key core process for manufacturing the high-performance recombined bamboo, and the interior of a bamboo bundle plate blank is subjected to changes such as high load deformation, temperature transfer, moisture migration, resin curing and the like in the hot pressing process to form a complex forming process under the multidimensional coupling action of 'humidity-heat-force-chemistry'.
After the hot pressing starts, the fluffy bamboo bundle plate blank is gradually compacted under the condition of high load, and visible macro pores among the bamboo bundles and in the bamboo bundles gradually disappear to form a plurality of fine micro-nano pore structures. In the hot pressing process, water vapor with certain pressure is easily formed in the micro-nano pore structures by residual moisture in the bamboo bundles and moisture generated by a resin curing side reaction, and if the hot pressing process is improperly controlled, the vapor is difficult to overflow from the inside of the compact bamboo bundle plate blank, so that hot pressing defects such as plate blank bubbling, deformation and the like are easily caused. Therefore, the method for measuring the steam pressure change, the temperature change and the like in the plate blank in the hot pressing process has important significance for adjusting and optimizing the hot pressing forming process. The temperature measurement usually adopts a method of pre-embedding a thermocouple to measure the temperature change in the hot pressing process of the plate blank, the technology is mature, but the continuous online measurement of the steam pressure in the recombined bamboo plate blank in the hot pressing process is still difficult to realize effectively. The reason is that the pressure of the 'cold-in-cold-out' forming process of the recombined bamboo reaches 4-6 MPa, the pressure of the 'cold-pressing-hot-curing' forming process reaches 60MPa, the plate blank is gradually compacted under the pressure load, the porosity is obviously reduced, and the online measurement difficulty of the steam pressure is high. At present, the method leads the steam in the artificial board blank out to the pressure sensor through a steam outlet pipe, and has certain feasibility. However, the method is susceptible to the influence of the ambient temperature, when the ambient temperature is low, the temperature of the steam delivery pipe exposed in the environment is low, high-temperature steam is susceptible to condensation in the delivery process, the steam pressure loss is large, and the measurement accuracy is low. Therefore, in the prior art, accurate and lossless derivation of steam pressure in the hot pressing process is still difficult to realize, and how to accurately derive and measure the steam pressure inside the plate blank in the hot pressing process of the recombined bamboo on line is a technical bottleneck in the field.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the device and the method for testing the internal steam pressure on line in the hot pressing process of the recombined bamboo, which have accurate and effective test results during hot pressing.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides an inside steam pressure on-line measuring device in reorganization bamboo hot pressing process, leads out tubular metal resonator, pressure sensor and data record appearance including the steam that connects gradually, steam derives the tubular metal resonator front end and stretches into in the reorganization bamboo hot pressing slab and be equipped with the steam entry that is linked together with the external world, and the rear end is connected with pressure sensor, steam derives that the tubular metal resonator does not stretch into and is equipped with temperature compensation device on periphery wall and the pressure sensor periphery wall in the reorganization bamboo hot pressing slab.
As a further improvement to the above technical solution:
as a further improvement of the above technical solution:
the temperature compensation device comprises a first temperature probe, a second temperature probe, an electronic temperature controller and an electric heating and heat preservation device, wherein the first temperature probe and the second temperature probe are electrically connected with the electronic temperature controller, the electric heating and heat preservation device is coated on the outer peripheral wall of the steam derivation metal pipe and the pressure sensor which do not extend into the recombined bamboo hot-pressing plate blank, the first temperature probe is arranged at the front end of the steam derivation metal pipe, and the second temperature probe is arranged between the pressure sensor and the electric heating and heat preservation device.
The steam inlet comprises a main steam inlet and a plurality of auxiliary steam inlets, wherein the main steam inlet and the auxiliary steam inlets are respectively arranged at the front end and the outer circumferential wall of the steam outlet metal pipe.
The first temperature probe is arranged close to the main steam introducing port.
And a scrap-proof net cover is arranged on the main steam leading-in opening.
The electric heating and heat-insulating device sequentially comprises a protective outer layer, a heat-insulating middle layer and an electric heating inner layer from the outer side to the inner side of the electric heating and heat-insulating device.
The pressure sensor comprises a metal shell, and a film pressure sensitive element and a signal converter are sputtered in the metal shell.
The pressure sensor is in threaded connection with the steam outlet metal pipe.
As a general inventive concept, the present invention provides a testing method of the above-mentioned online testing device for internal steam pressure during the hot pressing process of recombined bamboo, comprising the following steps:
s1, leading steam of the testing device out of the outer peripheral wall of the rear end of the metal tube and installing a temperature compensation device on the outer peripheral wall of the pressure sensor;
s2, placing the front end of the steam outlet metal pipe of the testing device on the paved plate blank, and continuously paving the plate blank to a preset thickness to obtain a complete plate blank;
and S3, placing the complete plate blank under a hot press for hot pressing treatment, and recording real-time data and outputting a result by a data recorder.
As a further improvement of the technical scheme:
in the step S2, the slab is a biomass material impregnated with an adhesive.
In step S3, the compensation temperature of the temperature compensation device is constant or variable.
Compared with the prior art, the invention has the advantages that:
(1) according to the online testing device for the internal steam pressure in the hot pressing process of the recombined bamboo, the temperature compensation device is arranged on the steam lead-out metal pipe and the outer peripheral wall of the pressure sensor, so that the problem that the steam is difficult to lead out without damage in the hot pressing process of the recombined bamboo is solved, and the testing result is accurate and effective.
(2) The temperature compensation device comprises an external first temperature measuring probe, a second temperature measuring probe, an electronic temperature controller and an electric heating and heat preservation device, wherein the first temperature measuring probe and the second temperature measuring probe are different in position, the electronic temperature controller realizes automatic temperature change compensation by comparing the measuring temperatures of the first temperature measuring probe and the second temperature measuring probe and is used for the electric heating and heat preservation device to carry out temperature compensation, and on the other hand, the electric heating and heat preservation device isolates environmental influence, so that the internal and external temperatures of a steam lead-out metal pipe and a pressure sensor are always consistent, the condensation loss of the steam in the lead-out process due to the external low-temperature environment is prevented, and the measuring accuracy of the steam pressure is ensured.
(3) According to the device for testing the internal steam pressure in the hot pressing process of the recombined bamboo, the steam leading-out metal pipe is provided with the plurality of steam inlet holes (comprising the main steam inlet and the auxiliary steam inlet) in all directions, so that the steam leading-in amount in the hot pressing process of the recombined bamboo is greatly increased, and the measured value of the steam pressure is more accurate.
(4) According to the online testing device for the internal steam pressure in the hot pressing process of the recombined bamboo, the steam leading-out metal pipe is tightly connected with the pressure sensor through the threads, so that the steam cannot overflow at the connection position to cause pressure loss, and the measurement accuracy of the internal steam pressure in the hot pressing process of the recombined bamboo is ensured. Meanwhile, the threaded connection mode is convenient to replace and overhaul, and the working efficiency is high.
(5) The invention relates to a testing method of an online testing device for internal steam pressure in the hot pressing process of recombined bamboos, which is characterized in that in the hot pressing process, the temperature of a plate blank is gradually increased, steam formed by evaporation of water in the plate blank (bamboo bundles) and steam formed by water generated by dehydration condensation reaction of an adhesive (such as phenolic resin) enter a steam leading-out metal pipe through a steam leading-in port, then enter a pressure sensor to act on the pressure sensor, the pressure sensor converts an analog signal into an electric signal and transmits the electric signal to a data recorder, and the data recorder continuously records the instantaneous pressure value of a measuring point.
Drawings
FIG. 1 is a schematic view of the overall structure of the device of the present invention.
Fig. 2 is a schematic view of the overall structure of the external temperature compensation device of the present invention.
Fig. 3 is a schematic semi-sectional view of a pressure sensor of the apparatus of the present invention.
FIG. 4 is a schematic half-sectional view of an electric heating and heat-insulating device of the present invention.
Figure 5 is a schematic view of the arrangement of the apparatus of the present invention within a completed slab.
Fig. 6 is an enlarged view of fig. 1 at a.
Fig. 7 is an enlarged view of fig. 1 at B.
FIG. 8 is a graph in which the target density was set to 1.1g/cm in example 13A core layer steam pressure change curve chart in the hot pressing process of the recombined bamboo.
FIG. 9 is a graph in which the target density was set to 1.1g/cm in example 23A core layer steam pressure change curve chart in the hot pressing process of the recombined bamboo.
FIG. 10 is a graph in which the target density was set to 0.9g/cm in example 33A steam pressure change curve diagram of the subsurface layer in the hot pressing process of the recombined bamboo.
FIG. 11 is a graph in which the target density was set to 0.9g/cm in example 43Steam pressure change curve of the subsurface layer in the hot pressing process of the recombined bamboo.
FIG. 12 is a graph in which the target density was set to 0.9g/cm in comparative example 13Steam pressure change curve of the subsurface layer in the hot pressing process of the recombined bamboo.
The reference numerals in the figures denote:
1. the steam is led out of the metal pipe; 11. a main steam introduction port; 12. a chip-proof mesh cover; 13. an auxiliary steam inlet; 3. a pressure sensor; 31. a metal housing; 32. sputtering a thin film pressure sensitive element; 33. a signal converter; 4. a data recorder; 5. a temperature compensation device; 51. a first temperature probe; 52. a second temperature measuring probe; 53. an electronic temperature controller; 54. an input plug; 55. a switch; 56. an electric heating and heat preserving device; 561. a protective outer layer; 562. a heat preservation middle layer; 563. electrically heating the inner layer; 6. completing the plate blank; 7. pressing a plate on the hot press; 8. and (5) pressing a lower pressing plate of the hot press.
Detailed Description
The present invention will be described in further detail below. Unless otherwise indicated, the instruments or materials employed in the practice of the present invention are commercially available.
Example 1 temperature Change Compensation
As shown in fig. 1 to 7, the online testing device of inside steam pressure in reorganization bamboo hot pressing process of this embodiment, derive tubular metal resonator 1, pressure sensor 3 and data record appearance 4 including the steam that connects gradually, steam derives tubular metal resonator 1 front end and stretches into in the reorganization bamboo hot pressing slab and be equipped with a plurality of steam inlets that are linked together with the external world, and the rear end is connected with pressure sensor 3, and steam derives that tubular metal resonator 1 does not stretch into and is equipped with temperature compensation device 5 on the periphery wall in the reorganization bamboo hot pressing slab and the 3 periphery walls of pressure sensor. The temperature compensation device 5 is used for realizing synchronous temperature rise inside and outside the steam guide metal pipe 1 and the pressure sensor 3.
The steam is derived the tubular metal resonator 1 and is adopted the metal to make, leads the temperature coefficient height, can ensure that steam is derived the tubular metal resonator and is visited into the inside synchronous intensification of slab part and slab, and steam derives tubular metal resonator 1's heat conductivility is excellent, and the body temperature can be synchronous fast with the slab temperature, does not have the difference in temperature, has guaranteed the measurement precision. Therefore, the steam can not cause pressure loss due to condensation when passing through the inside of the pipeline. In this embodiment, the data recorder 4 is a paperless recorder and is configured to record an instantaneous pressure value.
The temperature compensation device 5 comprises a first temperature probe 51, a second temperature probe 52, an electronic temperature controller 53, an electric heating and heat preservation device 56, the first temperature probe 51, the second temperature probe 52 is electrically connected with the electronic temperature controller 53, the electric heating and heat preservation device 56 is coated on the outer peripheral wall of the steam leading-out metal pipe 1 and the pressure sensor 3 which do not extend into the recombined bamboo hot-pressed slab, the first temperature probe 51 is arranged at the front end of the steam leading-out metal pipe 1, and the second temperature probe 52 is arranged between the pressure sensor 3 and the electric heating and heat preservation device 56. The electronic temperature controller 53 is used for comparing the temperature difference between the first temperature probe 51 and the second temperature probe 52, and implementing automatic heating, so as to realize synchronous temperature rise inside and outside the steam outlet metal pipe 1 and the pressure sensor 3.
In this embodiment, the electronic temperature controller 53 includes a control judgment module and a temperature management module, the control judgment module is internally provided with a preset assembler built in the main control development board assembly, and is used for comparing the measured temperature data of the first temperature probe 51 and the second temperature probe 52, and if the temperature measurement value of the first temperature probe 51 is greater than the measurement value of the first temperature probe 51, the temperature management module starts heating; otherwise, the heating is stopped. The electric heating heat preservation device 56 covers the whole pressure sensor 3 to the rear end of the steam leading-out metal pipe 1, and the rear end of the steam leading-out metal pipe 1 can cover 30-150 mm. The electronic temperature controller 53 has the function of automatically adjusting the temperature, can adjust the temperature to 300 ℃, has high temperature rise speed, and is insulated by the electric heating insulation device 56 after temperature rise.
In this embodiment, the temperature compensation device 5 further includes an input plug 54 electrically connected to the electronic temperature controller 53, and a switch 55 is disposed on a connection line between the input plug 54 and the electronic temperature controller 53. During testing, the switch 55 is turned on, and the electronic temperature controller 53 compares the temperatures measured at the measuring points of the two temperature measuring probes and then automatically heats the temperature to realize synchronous temperature rise inside and outside the steam outlet metal pipe 1 and the pressure sensor 3.
The steam inlet includes a main steam inlet 11 and a plurality of sub steam inlets 13 provided at the front end and the outer circumferential wall of the steam outlet metal pipe 1, respectively.
In this embodiment, the steam leading-out metal pipe 1 has an inner diameter of 2 to 4mm (i.e., the diameter of the main steam inlet 11), a wall thickness of 1 to 2mm, an outer diameter of 3 to 6mm, and the sub steam inlet 13 is a small hole having a diameter of 0.5 to 2 mm.
The traditional pressure guide capillary tube is small in size, the wall thickness is more than 1mm, the outer diameter is almost not more than 3mm, and the pressure guide capillary tube is suitable for traditional artificial boards (the hot pressing pressure is about 2-3 Mpa), but the hot pressing pressure of the recombined bamboo can be as high as 7Mpa, and the pressure guide capillary tube is not suitable for use. The wall thickness of the steam leading-out metal pipe 1 in the embodiment reaches 2mm, the wall thickness ratio is large, the bearing capacity is better, the steam leading-out metal pipe 1 has better bearing performance than the traditional pressure guide capillary, and the steam leading-out metal pipe is not easy to deform or crush under high pressure. The first temperature probe 51 is provided near the main steam introduction port 11. In this embodiment, the first temperature probe 51 passes through a small hole in the outer peripheral wall of the rear end of the steam outlet metal pipe 1, runs along the longitudinal direction of the metal pipe, and is finally disposed near the main steam inlet 11. The second temperature probe 52 passes through a small hole of the electric heating and heat insulating device 56 coated on the outer peripheral wall of the pressure sensor 3 and is arranged on the pressure sensor 3.
The main steam inlet 11 is provided with a chip-proof mesh cover 12.
The electric heating and heat-preserving device 56 sequentially comprises a protective outer layer 561, a heat-preserving middle layer 562 and an electric heating inner layer 563 from the outer side to the inner side of the electric heating and heat-preserving device 56. In this embodiment, the electrical heating inner layer 563 of the electrical heating and heat insulating device 56 is composed of a metal heating wire, high temperature resistant fibers and a control circuit, the controllable temperature is 0-300 ℃, the heat insulating middle layer 562 is made of aluminum silicate heat insulating cotton, and the protective outer layer 561 is made of silica gel glass fiber cloth.
The pressure sensor 3 comprises a metal shell 31, a sputtering film pressure sensitive element 32 and a signal converter 33 are arranged in the metal shell 31, the sputtering film pressure sensitive element 32 transmits a pressure signal to the signal converter 33, and the signal converter 33 is used for converting the pressure signal into an electric signal and outputting the electric signal to an electronic temperature controller 53 for result output. The working temperature of the sputtering film pressure sensitive element 32 can reach 200 ℃, and the sputtering film pressure sensitive element has the function of temperature internal compensation, the pressure range is 30 KPa-5 MPa, the frequency response is more than 10KHz, and the instantaneous pressure can be accurately measured. In this embodiment, the second temperature measuring probe 52 is located between the pressure sensor 3 and the metal shell 31. In this embodiment, the metal housing 31 is made of stainless steel.
The pressure sensor 3 is connected with the steam leading-out metal pipe 1 through screw threads. The front end of the pressure sensor 3 is provided with an external thread 22, and the rear end of the steam leading-out metal pipe 1 is provided with an internal thread 21.
The testing method of the online testing device for the internal steam pressure in the hot pressing process of the recombined bamboo comprises the following steps:
s1, leading the steam of the testing device out of the outer peripheral wall of the rear end of the metal tube 1 and the outer peripheral wall of the pressure sensor 3, and installing a temperature compensation device 5;
in this embodiment, the chip-proof mesh cap 12 is attached to the main steam inlet 11 at the front end of the steam outlet metal pipe 1 having an outer diameter of 5mm, an inner diameter of 3mm and a wall thickness of 2mm, and the front external thread 22 of the pressure sensor 3 is wound with a raw adhesive tape and connected to the rear internal thread 21 of the steam outlet metal pipe 1, thereby preventing the steam from leaking. The pressure sensor 3 is connected to a data recorder 4 to record the instantaneous pressure value. Closely wind temperature-compensated equipment 5 in pressure sensor 3 and steam export tubular metal resonator 1 rear end 150mm through magic subsides.
A first temperature measuring probe 51 is placed inside the main steam inlet 11 of the steam outlet metal pipe 1 through the small hole, and a second temperature measuring probe 52 is placed inside the electric heating and heat insulating device 56. The input plug 54 is connected with the electronic temperature controller 53, and the switch 55 is turned on, so that the electronic temperature controller 53 compares the two measured temperatures and then automatically heats the two measured temperatures, thereby realizing the synchronous inside and outside temperature rise of the special steam outlet metal pipe 1 and the pressure sensor 3 (namely, the temperature compensation mode of the electronic temperature controller 53 is temperature change compensation).
S2, placing the front end of the steam outlet metal pipe 1 of the testing device on the paved plate blank, and then continuously paving the plate blank to a preset thickness to obtain a complete plate blank 6;
in the embodiment, before hot pressing, phenolic resin impregnated bamboo bundles with 14% of water content are uniformly paved on a die, the target thickness of a plate blank is set to be 40mm, and the target density is set to be 1.1g/cm3When the paving thickness reaches 1/2, the steam leading-out metal pipe 1 is placed on the paved plate blank, the main steam leading-in port 11 of the steam leading-out metal pipe 1 is positioned at the center point of the plane of the plate blank, and then the bamboo bundles are continuously paved until the plate blank reaches 40mm of the target thickness. And (3) placing the paved complete plate blank 6 on a lower pressing plate 8 of a hot press, setting the hot pressing temperature to be 160 ℃, the hot pressing pressure to be 6Mpa and the hot pressing time to be 40min, then closing the press, and downwards moving an upper pressing plate 7 of the hot press until the surface of the plate blank is touched and the plate blank is pressed tightly. In other embodiments, the thickness of the reconstituted bamboo whole plate blank 6 is 15-60 mm, and the target density is 0.9 ℃ @1.3g/cm3The water content of the phenolic resin impregnated bamboo bundle is 8-14%, the hot pressing temperature is 120-160 ℃, the hot pressing pressure is 3-7 Mpa, and the hot pressing time is 25-45 min, and the same or similar technical effects can be obtained.
And S3, placing the complete plate blank 6 under a hot press for hot pressing treatment, and recording real-time data and continuously storing and outputting results by the data recorder 4.
In the hot pressing process, the temperature of the complete plate blank 6 is gradually increased, steam formed by water evaporation in the complete plate blank 6 (bamboo bundles) and steam formed by water generated by dehydration condensation reaction of phenolic resin enter the steam leading-in opening 11 and the auxiliary steam leading-in opening 13 to be led out of the metal pipe 1 and then enter the pressure sensor 3 to act on the sputtering film pressure sensitive element 32, the sputtering film pressure sensitive element 32 converts an analog signal into an electric signal through the signal converter 33 and then transmits the electric signal to the data recorder 4, and the data recorder 4 continuously records the instantaneous pressure value of the measuring point, as shown in fig. 8.
As can be seen from FIG. 8, the steam pressure curve is clear and coherent, the peak value is obvious, the tiny fluctuation and temperature change of the steam in the hot pressing process can be accurately captured, and the pressure value is more accurate than temperature change compensation.
Example 2 (constant temperature Compensation)
The test apparatus of this example is substantially the same as that of example 1 except that: the electronic temperature controller 53 sets the temperature compensation mode to be constant temperature compensation, and the temperature is 50 ℃.
The test method of this example is substantially the same as that of example 1, except that: the electronic temperature controller 53 sets a constant temperature compensation mode as the constant temperature compensation, adjusts the temperature to 50 ℃ and heats the temperature to ensure that the constant temperature of the external environment of the steam outlet metal pipe 1 and the pressure sensor 3 is 50 ℃.
The data logger 4 continuously records the instantaneous pressure values at the measurement points as shown in fig. 9.
As can be seen from fig. 9, in the case that the preparation parameters are the same as those in example 1, the steam pressure curve measured by the device using constant temperature compensation is later in the initial stage, smoother in the overall trend, lower in the peak value of steam pressure, and lower in the measurement accuracy compared with the temperature compensation compared with the steam pressure curve measured by the temperature variation compensation in example 1.
Example 3 temperature Change Compensation
The test apparatus of this example is substantially the same as that of example 1 except that: the outer diameter of the steam outlet metal pipe 1 is 3mm, the inner diameter thereof is 2mm, and the wall thickness thereof is 1 mm. The temperature compensation device 5 is wound on the pressure sensor 3 and the rear end of the steam leading-out metal pipe 1 by 100mm through magic tape.
The test method of this example is substantially the same as example 1, except that:
1. in step S1, the temperature compensation device 5 is wound around the pressure sensor 3 and the rear end of the steam outlet metal pipe 1 by a hook and loop fastener by 100 mm.
2. In step S2, before hot pressing, uniformly spreading the phenolic resin impregnated bamboo bundles with the water content of 8% on a mould, wherein the target thickness of the plate blank is set to be 15mm, and the target density is set to be 0.9g/cm3And when the paving thickness reaches 1/5, putting the steam leading-out metal pipe 1 on the paved plate blank, enabling the main steam leading-in port 11 of the steam leading-out metal pipe 1 to be located at the center point of the plane of the plate blank, and then continuously paving the bamboo bundles until the plate blank reaches 15mm of the target thickness to obtain the complete plate blank 6. And (3) placing the paved complete plate blank 6 on a lower pressing plate 8 of a hot press, setting the hot pressing temperature to be 120 ℃, the hot pressing pressure to be 3Mpa and the hot pressing time to be 25min, then closing the press, and downwards moving an upper pressing plate 7 of the hot press until the surface of the plate blank is touched and the plate blank is pressed tightly.
The data logger 4 continuously records the instantaneous pressure values of the measurement points as shown in fig. 10.
As can be seen from fig. 10, compared with the steam pressure curve measured by the temperature swing compensation in example 1, the curve of this example is smoother and has smaller peak value compared with the pressure curve of example 1, and the device is feasible under different preparation parameters.
Example 4 (constant temperature Compensation)
The test apparatus of this example is substantially the same as example 3 except that: the electronic temperature controller 53 sets the temperature compensation mode to be constant temperature compensation, and the temperature is 60 ℃.
The test method of this example is substantially the same as example 1, except that:
the electronic temperature controller 53 sets the temperature compensation mode to be constant temperature compensation, and adjusts the temperature to be constant temperature heating at 60 ℃ to ensure that the constant temperature of the external environment of the steam leading-out metal pipe 1 and the pressure sensor 3 is 60 ℃.
The data logger 4 continuously records the instantaneous pressure values at the measurement points as shown in fig. 11.
As shown in fig. 11, the curve of this example is smoother and has smaller peaks than the pressure curve of example 2, and the device can be obtained to have feasibility under different preparation parameters. Compared with the pressure curve obtained in the embodiment 3, the temperature-changing and constant-temperature compensation are compared, and the constant-temperature compensation of the embodiment has lower measurement precision compared with the temperature-changing compensation.
COMPARATIVE EXAMPLE 1 (without temperature Compensation device 5)
This comparative example test apparatus is substantially the same as example 4 except that: the temperature compensation device 5 is not provided in this embodiment.
The test method of this comparative example is the same as example 4 except that: in this embodiment, the temperature compensation device 5 is not provided, and the temperature compensation operation is not performed on the pressure sensor 3 or the vapor lead-out metal pipe 1.
The comparative example data recorder 4 continuously records the instantaneous pressure value at the measurement point as shown in fig. 12.
As can be seen from fig. 12, in the comparative example, in the case of the same preparation parameters as those of example 3, the steam pressure measured value without the temperature compensation device 5 was greatly different from that of example 3, and the value was extremely inaccurate. It follows that an accurate measurement of the steam pressure by the temperature compensation device 5 is necessary.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention, unless the technical essence of the present invention departs from the content of the technical solution of the present invention.
Claims (10)
1. The utility model provides an inside steam pressure on-line measuring device in reorganization bamboo hot pressing process, derives tubular metal resonator (1), pressure sensor (3) and data record appearance (4) including the steam that connects gradually, its characterized in that: steam derives in tubular metal resonator (1) front end stretches into reorganization bamboo hot pressing slab and is equipped with a plurality of steam inlets that are linked together with the external world, and the rear end is connected with pressure sensor (3), steam derives that tubular metal resonator (1) does not stretch into and is equipped with temperature compensation device (5) on periphery wall and pressure sensor (3) the periphery wall in the reorganization bamboo hot pressing slab.
2. The device for testing the internal steam pressure in the hot pressing process of the recombined bamboo as claimed in claim 1, wherein: temperature compensation arrangement (5) include first temperature probe (51), second temperature probe (52), electron temperature controller (53), electrical heating heat preservation device (56), first temperature probe (51), second temperature probe (52) are connected with electron temperature controller (53) electricity, electrical heating heat preservation device (56) cladding is on not stretching into steam derivation tubular metal resonator (1) and pressure sensor (3) periphery wall in the reorganization bamboo hot pressing slab, first temperature probe (51) set up and derive tubular metal resonator (1) front end at steam, second temperature probe (52) set up between pressure sensor (3) and electrical heating heat preservation device (56).
3. The device for testing the internal steam pressure in the hot pressing process of the recombined bamboo as claimed in claim 2, wherein: the steam inlet comprises a main steam inlet (11) and a plurality of auxiliary steam inlets (13) which are respectively arranged at the front end and the outer circumferential wall of the steam outlet metal pipe (1).
4. The device for testing the internal steam pressure in the hot pressing process of the recombined bamboo as claimed in claim 3, wherein: the first temperature probe (51) is arranged close to the main steam introducing port (11).
5. The device for testing the internal steam pressure in the hot pressing process of the recombined bamboo as claimed in claim 3, wherein: and a scrap-proof net cover (12) is arranged on the main steam introducing port (11).
6. The on-line testing device for internal steam pressure in the process of hot pressing of recombined bamboos according to any one of claims 2 to 5, wherein: the electric heating and heat-preserving device (56) sequentially comprises a protective outer layer (561), a heat-preserving middle layer (562) and an electric heating inner layer (563) from the outer side to the inner side of the electric heating and heat-preserving device (56).
7. The on-line testing device for internal steam pressure in the process of hot pressing of recombined bamboos according to any one of claims 2 to 5, wherein: the pressure sensor (3) comprises a metal shell (31), and a sputtering film pressure sensitive element (32) and a signal converter (33) are arranged in the metal shell (31).
8. The on-line testing device for internal steam pressure in the process of hot pressing of recombined bamboos according to any one of claims 2 to 5, wherein: the pressure sensor (3) is in threaded connection with the steam leading-out metal pipe (1).
9. A testing method of the on-line testing device for internal steam pressure in the process of hot pressing of recombined bamboos according to any one of claims 1 to 8, wherein the testing method comprises the following steps: the method comprises the following steps:
s1, leading the steam of the testing device out of the outer peripheral wall of the rear end of the metal pipe (1) and the outer peripheral wall of the pressure sensor (3) and installing a temperature compensation device (5);
s2, placing the front end of the steam outlet metal pipe (1) of the testing device on the paved plate blank, and paving the plate blank to a preset thickness to obtain a complete plate blank (6);
and S3, placing the complete plate blank (6) under a hot press for hot pressing treatment, adjusting the temperature compensation device (5) to compensate the temperature, and recording real-time data and outputting a result by the data recorder (4).
10. The test method of claim 9, wherein: in step S3, the compensation temperature of the temperature compensation device (5) is constant or variable.
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| CN106932047A (en) * | 2017-03-18 | 2017-07-07 | 中山市丰申电器有限公司 | A kind of steam-flow meter with self-cleaning function |
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| US5808206A (en) * | 1996-01-16 | 1998-09-15 | Mks Instruments, Inc. | Heated pressure transducer assembly |
| CN200962041Y (en) * | 2006-09-08 | 2007-10-17 | 中国林业科学研究院木材工业研究所 | Internal temperature pressure measurement device of artificial board and thermal pressure board flan |
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| CN114720045B (en) | 2023-12-19 |
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