Balanced moisture absorption in-situ measuring device

Abstract

The utility model belongs to the field of detection device design, and particularly relates to a balance moisture absorption in-situ measuring device which comprises a hook, a wire rope, a support, an infiltration box and a plurality of fixed pulleys. The support is T-shaped, the vertical end of the support is arranged on the ground, the horizontal end of the support extends into the infiltration box from the opening of the infiltration box and is connected with the fixed pulley A, the other end of the support is also connected with the fixed pulley B, and the axis connecting line of the fixed pulley A and the fixed pulley B is horizontally arranged; one end of the wire rope bypasses the fixed pulley A, extends into the infiltration box and is connected with a hook; the hook is vertically connected with a tested sample; the other end of the wire rope bypasses the fixed pulley B and is connected with the measuring unit; the moisture absorption capacity of the tested sample is measured through the measuring unit.

Description

Technical Field

[0001] The utility model belongs to the field of detection device design, and particularly relates to an in-situ measurement device for equilibrium moisture absorption capacity. Background Technique

[0002] The moisture absorption test of composite materials is to expose the materials to a specified environment and evaluate the moisture absorption state of the materials according to the change of mass with the exposure time. It is an accelerated moisture absorption method that simulates the moisture absorption process of materials in the natural environment. Generally, it is divided into two methods: steam infiltration and liquid immersion.

[0003] According to the regulations of the HB7401-2021 test method, the steps for moisture absorption using the steam infiltration method are as follows:

[0004] a) Initially weigh the specimen, record the mass of the specimen before moisture absorption pretreatment as the reference mass for moisture absorption, Wb, and place the specimen into a moisture absorption infiltration box that has been stabilized to the specified temperature.

[0005] b) Weigh the specimen at specified time intervals. Record each measurement result Wi.

[0006] c) After each time the specimen is taken out of the infiltration box, it should be placed into a specimen bag and cooled in the laboratory environment.

[0007] d) Take the specimen out of the specimen bag, wipe off the surface moisture with a wiping cloth and then weigh it until the last time. The time for taking the specimen out of the humid heat box for each weighing should not exceed 30 min, and the time for taking the specimen out of the specimen bag for each weighing should not exceed 5 min.

[0008] e) Calculate and record the mass percentage change for each time interval until the mass percentage reaches the specified moisture absorption equilibrium.

[0009] f) Calculate the moisture absorption capacity.

[0010] g) After the specimen reaches the effective moisture absorption equilibrium, take it out of the moisture absorption infiltration box, put it into a specimen bag together with a wet cloth, and store it in the laboratory environment. The storage time should not exceed 14 d.

[0011] In actual work, there are some deficiencies when using this method for moisture absorption tests. First, during the moisture absorption process, each interval weighing requires taking the test piece out of the infiltration box, and the process of opening the box door will cause a large fluctuation in the box environment. Second, water droplets will condense on the surface of the specimen taken out of the infiltration box, and it needs to be wiped before weighing. If the wiping effect is not good, it will lead to a large error in the weighing result. Third, when the number of specimens to be tested is large, to ensure that the weighing time does not exceed the requirements specified by the standard, the box needs to be opened multiple times and weighed in batches. Content of the Utility Model

[0012] Objective of the present utility model: To provide a device for in-situ measurement of equilibrium moisture absorption, so as to solve the problems of environmental fluctuations inside the infiltration box caused by opening it during each interval weighing, condensation on the surface of the specimen, and short weighing time, reducing the weighing error and improving the weighing efficiency.

[0013] Technical solution of the present utility model:

[0014] A device for in-situ measurement of equilibrium moisture absorption, comprising: a hook, a wire rope, a bracket, an infiltration box, and multiple fixed pulleys;

[0015] The bracket is T-shaped, the vertical end of the bracket is set on the ground, one end of the horizontal end of the bracket extends into the infiltration box from the opening of the infiltration box and is connected to fixed pulley A, and the other end of the bracket is also connected to a fixed pulley B. The axis connection line of fixed pulley A and fixed pulley B is horizontally arranged;

[0016] One end of the wire rope bypasses fixed pulley A and extends into the infiltration box and is connected to the hook, and the specimen to be tested is vertically connected to the hook;

[0017] The other end of the wire rope bypasses fixed pulley B and is connected to the measurement unit, and the moisture absorption of the specimen to be tested is measured through the measurement unit.

[0018] Further, the measurement unit is a force sensor.

[0019] Further, the setting direction of the force sensor is the vertical direction. The force sensor is connected to a computer through a cable, and the weight data of the specimen to be tested collected is transmitted to the computer in real time for display.

[0020] Further, the measurement unit is a weight and an electronic scale;

[0021] The mass of the weight is more than twice the mass of the specimen to be tested;

[0022] The weight is connected to one end of the wire rope, and the weight is placed on the electronic scale;

[0023] The change in the weight of the weight is measured through the electronic scale to measure the moisture absorption of the specimen to be tested.

[0024] Further, the device further comprises fixed pulley C and fixed pulley D;

[0025] The axis connection line of fixed pulley C and fixed pulley D is parallel to the axis connection line of fixed pulley A and fixed pulley B and is located below fixed pulley A and fixed pulley B;

[0026] One end of the wire rope connected to the measurement unit bypasses fixed pulley B and then bypasses fixed pulley C and fixed pulley D in sequence and is connected to one end of a balance. The other end of the balance is weighed through a weight;

[0027] The connecting point between the wire rope and one end of the balance and the tangent point of the fixed pulley D are parallel to the tangent point of the wire rope and the fixed pulley B and the fixed pulley C, and are perpendicular to the axis connection line of the fixed pulley C and the fixed pulley D, and the axis connection line of the fixed pulley A and the fixed pulley B.

[0028] Furthermore, the wire rope is a non-water-absorbing wire rope.

[0029] The beneficial effects of the present utility model:

[0030] A balance moisture absorption in-situ measurement device provided by the present utility model is simple and convenient to operate. During the weighing process, it is not necessary to open the infiltration box, which avoids the fluctuation of the internal environment of the box and improves the accuracy of moisture absorption detection.

[0031] When weighing the sample, there will be no condensation on the surface, reducing the steps of wiping the surface moisture, improving the detection efficiency, and reducing the error introduced by the surface moisture.

[0032] The sample does not need to be measured at room temperature, which can avoid situations such as the weighing time exceeding the standard requirements when there are too many samples, and improve the accuracy of detection. Description of the drawings

[0033] Figure 1 It is a schematic diagram of a balance moisture absorption in-situ measurement device;

[0034] Figure 2 It is a schematic diagram of the process flow of a balance moisture absorption in-situ measurement method. Specific embodiments

[0035] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present utility model.

[0036] A balance moisture absorption in-situ measurement device mainly transfers the gravity of the test sample to the measured end of the balance through the arrangement of the fixed pulley group to achieve the purpose of in-situ measurement. The device includes a stainless steel bracket 1, a fixed pulley 2, a fixed pulley 3, a fixed pulley 4, a fixed pulley 5, and a balance 6. The 4 fixed pulleys are respectively fixed on the stainless steel bracket 1, the fixed pulley 2 is placed in the infiltration box 8, and the fixed pulley 5 is placed in the balance.

[0037] The fixed pulley 2 and the fixed pulley 3 are in the same horizontal position.

[0038] The fixed pulley 4 and the fixed pulley 5 are in the same horizontal position.

[0039] The right side of the fixed pulley 5 is perpendicular to the tangent line of the horizontal position and is coaxial with the measured end of the balance 6.

[0040] A method for in-situ measurement of the equilibrium moisture absorption amount, and the specific implementation steps are as follows:

[0041] a) Weigh the sample initially and record the mass of the sample before moisture absorption pretreatment as the reference mass for moisture absorption, Wb. b) Tie the sample 7 to one end of a waterproof thin line and place it into the moisture absorption and infiltration box 8 that has been stabilized to a specified temperature. The thin line is pulled out from inside the infiltration box in the order of the fixed pulley group and is connected to the measured end of the balance 6.

[0042] c) Move the pulley 4 to ensure that the thin line is on the same axis as the measured end of the balance 6 and is perpendicular to the horizontal position of the balance 6.

[0043] c) Weigh the sample at specified time intervals. When weighing, temporarily close the air outlet inside the infiltration box 8 to ensure the stability of the environment inside the box. Record each measurement result Wi.

[0044] d) Calculate and record the percentage change in mass for each time interval until the percentage of mass reaches the specified moisture absorption equilibrium.

[0045] e) Calculate the moisture absorption amount.

[0046] f) After the sample reaches the effective moisture absorption equilibrium, take it out of the moisture absorption and infiltration box, put it into a sample bag together with a wet cloth, and store it in the laboratory environment. The storage time should not exceed 14 days.

[0047] As described above, only the specific embodiments of the present utility model are described in detail, and the unelaborated parts are conventional technologies. However, the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present utility model should be covered within the protection scope of the present utility model. The protection scope of the present utility model shall be subject to the protection scope of the claimed rights.

Claims

1. An in-situ measurement device for balancing moisture absorption capacity, characterized in that, The device includes: a hook, a wire rope, a bracket, a wetting box, and multiple fixed pulleys; The bracket is T-shaped. The vertical end of the bracket is set on the ground. One end of the horizontal end of the bracket extends into the wetting box from the opening of the wetting box and is connected to fixed pulley A. The other end of the bracket is also connected to a fixed pulley B. The axial center connection line of fixed pulley A and fixed pulley B is horizontally set; One end of the wire rope bypasses fixed pulley A and extends into the wetting box and is connected to the hook. A test specimen to be tested is vertically connected to the hook; The other end of the wire rope bypasses fixed pulley B and is connected to the measuring unit. The moisture absorption amount of the test specimen to be tested is measured by the measuring unit.

2. The device according to claim 1, characterized in that, The measuring unit is a force sensor.

3. The device according to claim 2, characterized in that, The setting direction of the force sensor is the vertical direction. The force sensor is connected to a computer through a cable, and the weight data of the test specimen to be tested collected is transmitted to the computer in real time for display.

4. The device according to claim 1, characterized in that The measuring unit is a weight and an electronic scale; The mass of the weight is more than twice the mass of the test specimen to be tested; The weight is connected to one end of the wire rope, and the weight is placed on the electronic scale; The change in the weight of the weight is measured by the electronic scale to measure the moisture absorption amount of the test specimen to be tested.

5. The device according to claim 1, characterized in that, The device further includes fixed pulley C and fixed pulley D; The axial center connection line of fixed pulley C and fixed pulley D is parallel to the axial center connection line of fixed pulley A and fixed pulley B and is located below fixed pulley A and fixed pulley B; One end of the wire rope connected to the measuring unit bypasses fixed pulley B and then bypasses fixed pulley C and fixed pulley D in sequence and is connected to one end of a balance. The other end of the balance is weighed by a weight; The connection line between the connection point of the wire rope and one end of the balance and the tangent point of fixed pulley D is parallel to the connection line of the tangent points of the wire rope and fixed pulley B and fixed pulley C, and is perpendicular to the axial center connection line of fixed pulley C and fixed pulley D and the axial center connection line of fixed pulley A and fixed pulley B.

6. The device according to claim 1, wherein The wire rope is a non-water-absorbing wire rope.

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