CN111679064A - Foaming quality detection device for thermal insulation foam - Google Patents

Abstract

The invention provides a foaming quality detection device for heat-preservation foam, which comprises a sampling container, a distance measuring instrument and a data processing device, wherein the sampling container is provided with a filling port, the upper end of the sampling container is provided with an opening, the distance measuring instrument is arranged above the sampling container and is configured to measure the height of a foaming material, the data processing device is configured to obtain the height of the foaming material measured by the distance measuring instrument and determine the growth state of the foaming material according to the height of the foaming material. Therefore, the intelligent detection of the foam foaming quality is realized, and the efficiency and the accuracy of the detection of the foam foaming quality are improved.

Description

Foaming quality detection device for thermal insulation foam

technical field

The invention relates to the technical field of thermal insulation materials, in particular to a foaming quality detection device of thermal insulation foam.

Background technique

The thermal insulation foam used as the thermal insulation material for refrigeration equipment is generally rigid polyurethane foam, and the formation process of the foam generally includes stages such as mixing, emulsification, raising, and gelation. Specifically, the white material and the black material are automatically mixed in the mixing head of the foaming agent, or manually mixed in a beaker, a polymerization reaction occurs, and the foaming gas begins to form and expand into fine bubbles, so that the foaming mixture is Milky, as the foaming gas increases, the foaming mixture begins to expand, and the foam volume gradually increases; after that, the polymerization reaction continues until the foaming material is completely gelled, and finally a foamed plastic is formed.

The existing white material is generally polyether polyol, the black material is generally isocyanate, and the foaming agent can be carbon dioxide, trichlorofluoromethane, cyclopentane, etc., starting from the time when the black material and the white material start to mix, Until the foaming material starts to gel and draw as the end, this time period is the gelation time of the foaming material. There are certain differences in the reaction characteristics of different materials.

The parameters that reflect the growth state of the foamed material, such as the density of the foamed plastic and the gelation time, directly reflect the foaming quality of the foamed material, and the foaming quality of the foamed material directly affects the thermal insulation performance of the refrigerator. The foaming quality of the foaming material needs to be tested. At present, the quality of the foamed material is generally tested manually. For example, the inspector tests the gelation time and foam density of the foamed material separately, which takes a long time and requires a lot of work, requiring long-term tracking and additional process capability analysis. , the operation is complex and cumbersome, and there is interference from human factors, which affects the measurement results.

SUMMARY OF THE INVENTION

In view of the above problems, one object of the present invention is to provide a foaming quality detection device for thermal insulation foam that overcomes the above problems or at least partially solves the above problems.

A further object of the present invention is to automatically detect the growth state of the foamed material and simplify the detection process.

The invention provides a foaming quality detection device of thermal insulation foam, comprising:

The sampling container has an injection port for injecting foaming material into the sampling container, and the upper end of the sampling container has an opening;

A distance measuring instrument, arranged above the sampling container, configured to measure the height of the foaming material;

The data processing device is configured to obtain the height of the foaming material measured by the distance measuring instrument, and determine the growth state of the foaming material according to the height of the foaming material.

Optionally, the detection device further includes:

A weight detector, configured to measure the weight of the foam in the sampling container after the foaming is completed;

The growth state of the foam material includes the density of the foam;

The data processing device is further configured to calculate the volume of the foam according to the height of the foam and the shape and size of the sampling container, and to calculate the density of the foam according to the volume of the foam and the weight of the foam.

Optionally, the growth state of the foamed material also includes a growth curve of the foamed material;

The data processing device is also configured to record the change of the height of the foaming material with time, so as to draw the growth curve. At the same time, it has the function of automatic analysis of the process control ability, and the output includes the gelation time and foam of the foaming material detected at different time points. Control charts for parameters such as density.

Optionally, the growth state of the foamed material also includes the gelation time of the foamed material;

The data processing device is further configured to record the time when the foam material is injected into the sampling container and the time when the height of the foam material rises to a preset height, so as to calculate the gelation time.

Optionally, the distance measuring instrument has a detection surface located directly above the opening and facing the opening;

A plurality of distance measuring probes are evenly distributed on the detection surface, and the detection range of the plurality of distance measuring probes covers the opening of the sampling container.

Optionally, the ranging probe is a laser ranging probe.

Optionally, the injection port is formed at the bottom end or the top end of the side wall of the sampling container.

Optionally, the sampling container is cylindrical.

Optionally, the detection device further includes:

a mobile cabinet, the bottom of which is provided with rollers, and the mobile cabinet has a bearing platform and a bracket arranged on the bearing platform;

The weight detector is placed on the bearing platform, the sampling container is placed on the weight detector, and the distance measuring instrument is arranged on the bracket.

Optionally, the data processing device is arranged in a mobile cabinet.

The foaming quality detection device of the thermal insulation foam of the invention, the special design of the sampling container, the distance measuring instrument and the data processing device, realizes the automatic detection of the foaming quality and improves the efficiency and accuracy of the foaming quality detection.

Further, in the foaming quality detection device of the thermal insulation foam of the present invention, the data processing device can determine the growth curve of the foamed material and the gelation time of the foamed material according to the height of the foamed material, so as to more directly reflect the development of the foam. bubble quality.

Further, in the foaming quality detection device of the thermal insulation foam of the present invention, by adding a weight detector, combined with the height of the foaming material detected by the distance measuring instrument, the overall density of the foam that can directly reflect the foaming quality is determined. In addition, by using a ranging instrument with multiple ranging probes, the accuracy of the calculation of the overall density of the foam is improved.

The above and other objects, advantages and features of the present invention will be more apparent to those skilled in the art from the following detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings.

Description of drawings

Hereinafter, some specific embodiments of the present invention will be described in detail by way of example and not limitation with reference to the accompanying drawings. The same reference numbers in the figures designate the same or similar parts or parts. It will be understood by those skilled in the art that the drawings are not necessarily to scale. In the attached picture:

1 is a schematic diagram of a detection device according to an embodiment of the present invention;

2 is a schematic diagram of a distance measuring instrument of a detection device according to an embodiment of the present invention;

3 is a schematic diagram of a sampling container and foam of a detection device according to an embodiment of the present invention; and

FIG. 4 is a growth curve of the foam injected into the sampling container according to an embodiment of the present invention.

Detailed ways

This embodiment innovatively provides a device that can automatically detect the foaming quality of the foam 200, realizes the intelligent detection of the foaming quality, and improves the efficiency and accuracy of the foaming quality detection.

Specifically, as shown in FIG. 1 , FIG. 1 is a schematic diagram of a foaming quality detection device 100 for thermal insulation foam 200 according to an embodiment of the present invention. The foaming quality detection device 100 includes a sampling container 101 , a distance measuring instrument 103 and a data processing device 105 . The sampling container 101 has a feeding port 101a. For example, the feeding port 101a is formed at the bottom end or top of the side wall of the sampling container 101. The feeding port 101a shown in FIG. 1 is located at the bottom end of the side wall of the sampling container 101. The foaming machine ( (not shown) inject the foaming material into the sampling container 101 through the injection port 101a. The upper end of the sampling container 101 has an opening 101b, and the distance measuring instrument 103 is arranged above the sampling container 101 for measuring the height of the foaming material during the foaming and expansion process. The data processing device 105 can acquire the height of the foaming material measured by the distance measuring instrument 103, and can determine the growth state of the foaming material according to the height of the foaming material.

The growth state of the foamed material may include the density of the foamed material, the growth curve of the foamed material, the gelation time of the foamed material, and the like.

The sampling container 101 is made of a hard material and cannot be deformed, so as to prevent the foaming material from expanding and squeezing the sampling container 101 and causing deformation of the sampling container 101, which affects the accuracy of the detection of the growth state of the foaming material.

The sampling container 101 is designed to be detachable, for example, at least one side cover of the sampling container 101 can be opened to facilitate taking out the thermal insulation foam 200 . The shape of the sampling container 101 may be cylindrical, and the size of the sampling container 101 is matched and calculated according to the injection volume.

FIG. 2 is a schematic diagram of the distance measuring instrument 103 of the detection apparatus 100 according to an embodiment of the present invention. The distance measuring instrument 103 has a detection surface 103a located directly above the opening 101b of the sampling container 101 and facing the opening 101b. A plurality of distance measuring probes 103b are evenly distributed on the detection surface 103a, and the detection range of all the distance measuring probes should be The opening 101b of the sampling container 101 is covered. The ranging probe may be a laser ranging probe.

The opening 101b may be circular, and correspondingly, the detection surface 103a of the distance measuring instrument 103 is also circular, and the plurality of distance measuring probes 103b may be evenly distributed in the annular area of the detection surface 103a, so that the detection range of the distance measuring probe 103b is The opening 101b of the sampling container 101 can be completely covered, and the height values of multiple regions at the upper end of the foaming material can be detected, so that the growth state of the foaming material can be more truly and accurately determined. Through multi-point detection, the distance measuring instrument 103 can capture the irregular foam growth state and obtain more accurate detection results.

In some embodiments, as shown in FIG. 1 , the detection device 100 further includes a weight detector 102 . The weight detector 102 can be an electronic scale, a weight sensor, etc. The weight detector 102 is configured to measure the amount of the sample in the sampling container 101 after foaming. For the weight of the foam 200 , the data processing device 105 may also be configured to calculate the volume of the foam 200 according to the height of the foam material and the shape and size of the sampling container 101 , and calculate the density of the foam 200 according to the volume of the foam 200 and the weight of the foam 200 .

If the sampling container 101 is cylindrical, the data processing device 105 can calculate the volume of the foam 200 according to the height of the foaming material and the diameter of the sampling container 101, and obtain the volume of the foam 200 according to the weight of the foam 200 measured by the weight detector 102. overall density.

Fig. 3 shows a schematic diagram of the sampling container 101 and the foam 200. After the foaming of the foaming material is completed, as shown in Fig. 2, the top of the foam 200 is theoretically an elliptical structure. The tip may be irregularly shaped. The plurality of distance measuring probes 103b can measure the heights of different areas at the top of the foam 200 to obtain a plurality of height values. The data processing device 105 can use the average value of the plurality of height values as the average height of the foam, and then combine the shape and size of the sampling container 101 and The weight of the foam material calculates the overall density of the foam 200, thereby improving the accuracy of the overall density of the foam 200.

The data processing device 105 can also be configured to record the change of the height of the foam material with time, so as to draw a growth curve, as shown in FIG. The curve of t changes, that is, the growth curve of the foaming material, wherein h1 is the final height of the foam 200 after the foaming is completed, and h2 is the height of the foam 200 corresponding to the time point t2. Wherein, the height value corresponding to each time point may be the aforementioned average height value.

The data processing device 105 is further configured to record the time when the foam material is injected into the sampling container and the time when the height of the foam material rises to a preset height, and the difference between the two is the gelation time. The data processing device 105 can communicate with the foaming machine that injects material into the sampling container 101, and time when the foaming machine starts to inject material. The time t2 is the gelation time of the foamed material, and h1 is the preset height.

The preset height is a value pre-written in the control program of the data processing device 105 . The experimenter analyzes the big data measured by hand, determines the relationship between the rising height of the foam and the final height, and then determines the preset height corresponding to the gelation time.

As shown in FIG. 1 , the detection device 100 may further include a mobile cabinet 104 , the bottom of which is provided with rollers 107 , and a support 106 is provided on the carrying platform of the mobile cabinet. The weight detector 102 is placed on the supporting table, and the sampling container 101 is placed on the weight detector 102, which makes the detection device 100 more flexible and facilitates the injection operation of the foaming machine at different positions.

The distance measuring instrument 103 is fixed by the bracket 106 , and the fixed position of the distance measuring instrument 103 must ensure that it is directly above the sampling container 101 and is in a position that cannot be reached by the expansion of the foaming material. The data processing device 105, power supply components, etc. are arranged in the mobile cabinet 104, so that the various components of the entire detection device 100 are more concentrated.

The mobile cabinet 104 may also have a display screen (not shown) showing the growth state of the foam. The growth state of the foamed material processed by the data processing device 105, such as the density of the foam, the growth curve of the foamed material, the gelation time of the foamed material, etc., can be directly displayed on the display screen, and of course, can also be sent to the connection to it. On the terminal, such as the experimenter's computer, mobile phone, etc.

The data processing device 105 can also have a process capability index (Process Capability Index, CPK for short) analysis function, perform CPK analysis on each data obtained by performing multiple quality inspections at different time points, and output a data containing the foaming materials obtained by testing at different time points. The control chart of parameters such as gelation time and foam density can directly reflect the foaming quality of the foaming material, and can be sent to the relevant experimental personnel for timely correction when the data is abnormal.

To facilitate a clearer understanding of the detection apparatus 100 of this embodiment, the detection process of the detection apparatus 100 of one of the embodiments is described below as follows.

In step S1, the foaming machine injects foaming material into the sampling container 101 through the material injection port 101a, and the data processing device 105 records the time when the foaming machine starts to inject material, which is recorded as the initial time, and at the same time, the distance measuring instrument 103 is turned on;

Step S2, the data processing device 105 draws the growth curve of the foam material from the initial time to the end of foaming according to the height detected by the distance measuring instrument 103 during the foaming process of the foam material, and stores it;

In step S3, the weight detector 102 detects the weight of the foam 200 after foaming, and the data processing device 105 calculates the volume of the foam 200 according to the height of the foam 200 after the foaming and the shape and size of the sampling container 101. The weight of the foam 200 detected by the weight detector 102 calculates the density of the foam and stores it;

Step S4, remove the foam 200 that has been foamed, and repeat steps S1 to S3 to perform multiple quality inspections of the foaming material at different time points;

Step S5, read the above data stored in each quality inspection, perform CPK capability analysis, output a control chart, and send it to the relevant experimenters, so that the experimenters can intuitively understand the foaming quality of the detected foaming material.

The special design of the foaming quality detection device 100, the sampling container 101, the distance measuring instrument 103 and the data processing device 105 of the thermal insulation foam 200 of the present invention realizes the automatic detection of the foaming quality of the foam 200 and improves the efficiency of the foaming quality detection and accuracy.

Further, in the foaming quality detection device 100 of the thermal insulation foam 200 of the present invention, the data processing device 105 can determine the growth curve of the foamed material and the gelation time of the foamed material according to the height of the foamed material, so as to reflect more directly. Foam quality of foam 200.

Further, in the foaming quality detection device 100 of the thermal insulation foam 200 of the present invention, by adding a weight detector 102, combined with the height of the foaming material detected by the distance measuring instrument 103, the foam 200 that can directly reflect the foaming quality is determined. overall density. In addition, by using the distance measuring instrument 103 having a plurality of distance measuring probes 103b, the accuracy of the overall density calculation of the foam 200 is improved.

By now, those skilled in the art will recognize that, although various exemplary embodiments of the present invention have been illustrated and described in detail herein, the present invention may still be implemented in accordance with the present disclosure without departing from the spirit and scope of the present invention. The content directly determines or derives many other variations or modifications consistent with the principles of the invention. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims (10)

1. A foaming quality detection device for thermal insulation foam, comprising: a sampling container, with an injection port, so as to inject foaming material into the sampling container, and the upper end of the sampling container has an opening; A distance measuring instrument, arranged above the sampling container, configured to measure the height of the foaming material; The data processing device is configured to obtain the height of the foaming material measured by the distance measuring instrument, and determine the growth state of the foaming material according to the height of the foaming material. 2. The detection device according to claim 1, further comprising: A weight detector configured to measure the weight of the foam in the sampling container after foaming is completed; The growth state of the foam material includes the density of the foam; The data processing device is further configured to calculate the volume of the foam according to the height of the foam and the shape and size of the sampling container, and to calculate the density of the foam according to the volume of the foam and the weight of the foam . 3. The detection device of claim 1, wherein The growth state of the foamed material also includes the growth curve of the foamed material; The data processing device is further configured to record the change of the height of the foam material with time, so as to draw the growth curve. 4. The detection device of claim 3, wherein The growth state of the foamed material also includes the gelation time of the foamed material; The data processing device is further configured to record the time when the foam material is injected into the sampling container and the time when the height of the foam material rises to a preset height, so as to calculate the gelation time. 5. The detection device of claim 1, wherein The distance measuring instrument has a detection surface located directly above the opening and facing the opening; A plurality of distance measuring probes are evenly distributed on the detection surface, and the detection ranges of the plurality of distance measuring probes cover the opening of the sampling container. 6. The detection device of claim 5, wherein The ranging probe is a laser ranging probe. 7. The detection device of claim 1, wherein The injection port is formed at the bottom end or the top end of the side wall of the sampling container. 8. The detection device of claim 1, wherein The sampling container is cylindrical. 9. The detection device according to claim 2, further comprising: a mobile cabinet, the bottom of which is provided with rollers, and the mobile cabinet has a bearing platform and a bracket arranged on the bearing platform; The weight detector is placed on the support table, the sampling container is placed on the weight detector, and the distance measuring instrument is arranged on the bracket. 10. The detection device of claim 9, wherein The data processing device is arranged in the mobile cabinet.

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