CN219104923U

CN219104923U - Novel agricultural canopy membrane drips performance check out test set

Info

Publication number: CN219104923U
Application number: CN202223301067.8U
Authority: CN
Inventors: 张楠; 金嘉成; 王艳雨; 夏铭德; 陈静茹; 章若红
Original assignee: Shanghai Institute of Quality Inspection and Technical Research
Current assignee: Shanghai Institute of Quality Inspection and Technical Research
Priority date: 2022-12-09
Filing date: 2022-12-09
Publication date: 2023-05-30
Anticipated expiration: 2032-12-09

Abstract

The utility model designs novel agricultural greenhouse film dripping performance detection equipment which comprises a machine body, wherein a heating water tank and a heater are arranged in the machine body. The sample clamp frame is connected with the top end of a connecting handle through a rotating shaft, and the other end of the connecting handle is connected with the cambered surface cover plate through the rotating shaft. The utility model has the advantages that the sample is placed flatly, no fold appears, and the sample is a plane with a certain radian, so that the actual use condition can be simulated more truly. The method has the advantages of simple and accurate calculation, convenient sample placement and removal, and no influence on the test process, and can calculate the failure rate at any time in the process. 5. The device is simple, and the result is not influenced by the complexity of the device. The multi-station arrangement can be realized, and the working efficiency is improved.

Description

Novel agricultural canopy membrane drips performance check out test set

Technical Field

The utility model relates to a novel agricultural plastic film dripping performance tester which is used for detecting the dripping performance of an agricultural plastic film.

Background

Current national product standards: GB/T4455-2019 (agricultural polyethylene blow-molded greenhouse film), GB/T20202-2019 (agricultural ethylene-vinyl acetate copolymer (EVA) blow-molded greenhouse film) and the like all have drip performance detection projects, the equipment used by the drip performance detection device is derived from an agricultural plastic film drip performance tester and detection method (CN 02149385) and a double-station agricultural plastic film drip performance tester (CN 201120570908), the drip film sample is buckled on the drip tester at an inclined angle of 15 DEG with the horizontal plane downwards, a continuous buckling film is formed under the high humidity environment of constant-temperature pure water heating at (60+/-1), obvious drip (almost white) can be formed when the drip can not normally flow downwards along the film surface from high to low, the drip failure radius is measured by a ruler, the drip failure area is calculated by a formula, and the time when the area reaches a standard index value is taken as the drip failure time. The detection project reflects the good and bad dripping capability of the greenhouse film, and the longer the dripping failure time is, the longer the service life of the agricultural film is. However, this apparatus and method has certain drawbacks:

1. the sample placing mode of the equipment is not scientific, a round plane agricultural film sample with a certain area is downwards pressed against the center position of the film by a metal pressing hammer to form an inverted cone shape, so that the sample cannot be placed flatly, a large number of wrinkles are necessarily formed, the actual area of the sample at the wrinkles is larger than the vertical projection area of the wrinkles, the high-temperature high-humidity aging effect of water vapor is uneven in the tested area of the whole sample film, and the test result is inaccurate;

2. the mode is also unreasonable, after the sample is jacked by the pressing hammer, the sample extends linearly along the inclined angle from the edge of the sample to the center pressing hammer, and in actual use, the agricultural greenhouse film basically adopts a certain radian and extends from the roof, so that the liquid drops can flow and drop more quickly. The standard mode can not simulate the real use effect better;

3. the round tested area is inaccurate in a method for calculating the failure area, after a round sample is equally divided into 8n (n is a natural number) by taking the center of a circle as a center point according to a standard and patent method, the flow drop failure radius is sequentially measured along the bisector after the test is finished, and then the flow drop failure area is calculated according to a formula, which is equivalent to the assumption that the failure edge of each divided area is a right round edge with the flow drop failure radius on one side of the round test area, the flow drop failure area can be approximately calculated, the value of n is 1 in actual detection, but the 8 divided areas among the 8 bisectors are too large, the edges of the failure area are complex, the calculation cannot be consistent with the mode, if the value of n is increased, the accuracy of the result is further improved, the accurate result cannot be obtained, and the measurement workload can be greatly increased by increasing the value of n;

4. the existence of the circular sample cover makes the equipment structure complicated, different sample cover heights, sample cover material thicknesses and the like, so that the temperature and the relative humidity when the water vapor rises to the sample position are different, the failure result of the sample is affected, and the consistency of the test conditions is not achieved.

In addition, the utility model of a film dripping performance tester (authorized bulletin No. CN 207586073U) also introduces a new detection device, but the whole structure of the device is still not separated from the agricultural plastic film dripping performance tester and detection method (CN 02149385).

Disclosure of Invention

The utility model aims to overcome the problems of agricultural greenhouse film dripping performance detection equipment in the prior art and provides novel agricultural greenhouse film dripping performance detection equipment. The sample clamp frame is connected with the top end of a connecting handle through a rotating shaft, and the other end of the connecting handle is connected with the cambered surface cover plate through the rotating shaft. The sample clamping frame consists of a positioning frame and a pressing frame, the positioning frame and the pressing frame are connected in a nested manner, and the test agricultural greenhouse film is embedded between the positioning frame and the pressing frame. The detection windows are distributed on the cambered surface cover plate in a single-sided arrangement or front-back symmetry or single arrangement. The sample clamping frame is the same cambered surface as the detection window on the cambered surface cover plate. The utility model has the advantages that 1, the sample is placed flatly, no fold appears, and the sample is a plane with a certain radian, so that the actual use condition can be simulated more truly. 2. The method has the advantages of simple and accurate calculation, more accurate data and more accurate results, and the failure area is calculated through the surface area measuring instrument. 3. The sample frame is square or other shapes, so that the calculation and the installation of the sample are convenient. The sample is convenient to place and take down, and the sample pressing frame is only required to be lifted or pressed down. 4. The failure rate in the process of calculation can be calculated at any time, and the test process is not influenced. 5. The device is simple, and the result is not influenced by the complexity of the device. The multi-station arrangement can be realized, and the working efficiency is improved.

Drawings

Fig. 1 is a schematic structural view of the present utility model.

FIG. 2 is a schematic view of the upper edge inclination angle and the lower edge inclination angle of the sample according to the present utility model.

FIG. 3 is a schematic diagram showing the structure of the sample frame and the sample according to the present utility model.

Fig. 4 is a schematic diagram of a front-back two-side symmetrical distribution structure of the present utility model.

Fig. 5 is a schematic diagram of a side distribution structure of the present utility model.

Detailed Description

The utility model will be described in detail with reference to the following examples and figures,

the novel agricultural greenhouse film drip performance detection device comprises a machine body 1, a heating water tank (not shown in the figure) and a heater (not shown in the figure) are arranged in the machine body, and a control display 11 is characterized in that the upper part of the machine body is a cambered surface cover plate 2, a detection window 3 is arranged on the cambered surface cover plate, a sample clamping frame 4 is arranged on the detection window 3, and the sample clamping frame is connected to the cambered surface cover plate. The sample clamping frame is connected with the top end of a connecting handle 6 through a rotating shaft 5, and the other end of the connecting handle 6 is connected with the cambered surface cover plate through a rotating shaft 7. The sample clamping frame is composed of a positioning frame 8 and a pressing frame 9, the positioning frame and the pressing frame are connected in a nested mode, and the test agricultural greenhouse film 10 is embedded between the positioning frame and the pressing frame. The detection windows are distributed on the cambered surface cover plate in a single-sided arrangement or front-back symmetry or single arrangement. The sample clamping frame is the same cambered surface as the detection window on the cambered surface cover plate.

When in operation, the device comprises:

1. the inside of the machine body is heated by a heater to heat the water to a certain temperature (for example, 60 ℃ required in the agricultural polyethylene blow molding greenhouse film of standard GB/T4455-2019), and the inside of the machine body is filled with water vapor. The temperature can be adjusted by the control panel to observe whether the water level is too low.

2. The arc-shaped cover plate on the upper part of the machine body is an arc-shaped panel to simulate the appearance of a real greenhouse, the radius of the arc-shaped panel is generally 30 cm-1 m, or the arc-shaped panel is manufactured according to the requirement, preferably 50 cm-80 cm, and the larger the radius is, the larger the equipment host is, but the real situation can be better simulated; the smaller the radius, the smaller the host volume, the lower the cost, or the reduced test floor space, etc. When taking a sample, the sample clamping frame can be lifted, and when installing the sample, the sample clamping frame is pressed down.

The cambered surface cover plate at the upper part of the machine body can be provided with the test stations at both sides or the stations are arranged side by side, so that the number of the stations is increased.

The sample clamping frame is formed by a positioning frame and a pressing frame, the positioning frame and the pressing frame are used in a matched mode (only the frame is empty in the middle), the pressing frame is slightly larger than the positioning frame or slightly smaller than the positioning frame, the positioning frame and the pressing frame can be tightly combined, the sample is squeezed tightly, the movement is avoided, and water vapor is prevented from leaking. The position of the sample station can be arranged according to the requirement, the inclination angle of the sample clamping frame at the station can be adjusted according to the requirement, the inclination angles of the sample clamping frame at different positions of the station are different, the inclination angle of the sample clamping frame is increased towards the lower part of the cambered surface cover plate, the preferable upper edge inclination angle is 0-10 degrees, and the lower edge inclination angle is 20-40 degrees. When the single-row design station on the top surface is selected, the sample positioning frame has no upper edge inclination angle, and the two sides are symmetrical to form lower edge inclination angles.

Sample positioning frame and press frame and size can adjust the design as required, and the preferred frame is square: the longitudinal and transverse dimensions are consistent. Or other shapes such as rectangular, circular, polygonal, etc.

The testing method comprises the following steps:

1. and (3) installing a sample: after the equipment stabilized to the set temperature, the test piece was installed: cutting the sample to be larger than the sample positioning frame, spreading the sample positioning frame, rotating the pressing frame connecting handle, pressing the pressing frame on the positioning frame, and tightly squeezing the edges of the sample by the two frames, wherein the edges are watertight. The portion of the sample within the frame is in direct contact with the water vapor inside the body. And then starting an agricultural film dripping performance test.

2. The fog formation condition of the surface of the agricultural film can be observed in real time, and the failure condition of the drip can be deduced.

3. Calculating the failure area of the droplet: and drawing a line along the edge of the failure part on the sample by using a marker pen, and drawing a line on the edge of the sample close to the frame. And taking down the sample, placing the sample on a sample table of the surface area measuring instrument, starting the surface area measuring instrument to measure the area in the drawn line of the sample, and obtaining failure area data S1. By the formula d=100% ×s1/S0. The failure rate of the flow drop at this time was obtained.

S0 is the total area in the sample positioning frame or the pressing frame (based on the inner frame), and the area can be measured by a ruler or provided with a size by fixing equipment. S1 is the failure area.

If in the test process, the failure area part can be obtained in a copying mode, and the flow drop failure rate in the test process is calculated.

The device has the advantages that:

1. the sample is placed flatly, no fold appears, and the sample is a plane with a certain radian, so that the actual use condition can be simulated more truly.

2. The method has the advantages of simple and accurate calculation, more accurate data and more accurate results, and the failure area is calculated through the surface area measuring instrument.

3. The sample frame is square or other shapes, so that the calculation and the installation of the sample are convenient. The sample is convenient to place and take down, and the sample pressing frame is only required to be lifted or pressed down.

4. The failure rate in the process of calculation can be calculated at any time, and the test process is not influenced.

5. The device is simple, and the result is not influenced by the complexity of the device. The multi-station arrangement can be realized, and the working efficiency is improved.

Claims

1. The utility model provides a novel agricultural canopy membrane drips performance check out test set, includes the organism, and the inside heating water tank and the heater that have of organism, control display, its characterized in that organism upper portion is the cambered surface apron, is provided with the detection window on the cambered surface apron, is provided with the sample on the detection window and presss from both sides the frame, and the sample presss from both sides the frame and connects on the cambered surface apron.

2. The novel agricultural greenhouse film dripping performance detection device according to claim 1, wherein the sample clamping frame is connected with the top end of a connecting handle through a rotating shaft, and the other tail end of the connecting handle is connected with the cambered surface cover plate through the rotating shaft.

3. The novel agricultural greenhouse film dripping performance detection device according to claim 1, wherein the sample clamping frame consists of a positioning frame and a pressing frame, the positioning frame and the pressing frame are connected in a nested manner, and the agricultural greenhouse film is embedded between the positioning frame and the pressing frame.

4. The novel agricultural greenhouse film dripping performance detection device according to claim 1, wherein the detection windows are distributed on the cambered surface cover plate in a single-sided arrangement or in a front-back symmetrical or single arrangement.

5. A novel agricultural greenhouse film dripping performance detection device according to any one of claims 1 to 3, wherein the sample clamping frame is the same cambered surface as the detection window on the cambered surface cover plate.