阅读说明：本技术 一种金属线膨胀系数的测量装置 (Measuring device for linear expansion coefficient of metal ) 是由 程琳 林杰 刘立瑞 吉芯慧 陈冠政 李小云 于 2021-01-08 设计创作，主要内容包括：一种金属线膨胀系数的测量装置,包括计算机、PASCO科学工作站、导轨底盘、对称设置在所述导轨底盘上的第一固定支架和第二固定支架,所述第一固定支架上设置有LVDT位移传感器,所述第二固定支架上设置有金属加热器,所述金属加热器内置待加热金属杆所述金属加热器外侧套设有温度传感器,所述LVDT位移传感器与所述金属加热器位于同一水平线上,所述位移传感器与所述金属加热器均与所述PASCO科学工作站相连,所述PASCO工作站与所述计算机相连,其中,所述计算机包括PASCO Capstone软件。(The utility model provides a measuring device of coefficient of linear expansion of metal, includes computer, PASCO science workstation, guide rail chassis, symmetry set up first fixed bolster and second fixed bolster on the guide rail chassis, be provided with LVDT displacement sensor on the first fixed bolster, be provided with metal heater on the second fixed bolster, metal heater embeds to wait to heat the metal pole metal heater outside cover is equipped with temperature sensor, LVDT displacement sensor and metal heater are located same water flat line, displacement sensor and metal heater all link to each other with PASCO science workstation, PASCO workstation links to each other with the computer, wherein, the computer includes PASCO Capstone software.)

1. A measuring device for linear expansion coefficient of metal is characterized in that: including computer, PASCO science workstation, guide rail chassis (1), symmetry set up first fixed bolster and second fixed bolster on guide rail chassis (1), be provided with LVDT displacement sensor (3) on the first fixed bolster, be provided with metal heater (4) on the second fixed bolster, metal heater (4) are built-in to wait to heat the metal pole, metal heater (4) outside cover is equipped with temperature sensor (8), LVDT displacement sensor (3) with metal heater (4) are located same water flat line, displacement sensor (3) with metal heater (4) all with PASCO science workstation links to each other, PASCO science workstation with the computer links to each other, wherein, the computer includes PASCO Capstone software.

2. The device for measuring the linear expansion coefficient of a metal according to claim 1, wherein: the LVDT displacement sensor (3) comprises a probe (11), an LVDT displacement sensor shell (10) and a rubber sleeve (12), wherein the probe (11) is arranged at one end of the LVDT displacement sensor shell (10), and the rubber sleeve (12) is sleeved at one end of the probe (11).

3. The device for measuring the linear expansion coefficient of a metal according to claim 1, wherein: and a sensor fixing knob (6) for fixing the LVDT displacement sensor (3) is arranged on the first fixing support.

4. The device for measuring the linear expansion coefficient of a metal according to claim 1, wherein: and a heater fixing knob (7) for fixing the metal heater (4) is arranged on the second fixing support.

5. The device for measuring the linear expansion coefficient of a metal according to claim 1, wherein: and the first fixing support and the second fixing support are both provided with support fixing knobs (5) for fixing the first fixing support and the second fixing support on the guide rail chassis (1).

6. A device for measuring linear expansion coefficient of metal according to claim 3, wherein: one end of the metal heater (4) is provided with a metal rod fixing knob (9).

Technical Field

The invention relates to the field of measuring instruments, in particular to a measuring device for a metal linear expansion coefficient.

Background

Under the same conditions, the linear expansion degree of different materials is different, and the linear expansion coefficient is used for expressing the property and difference of the materials. The linear expansion coefficient of a material is determined and is in fact attributed to the measurement of the slight elongation of the material over a certain temperature range. Experiments show that in a certain temperature range, after a solid with the original length of L is heated, the relative elongation delta L/L of the solid is in direct proportion to the variation of the temperature, namely:

αΔT＝ΔL/L (1)

in the formula, α is referred to as linear expansion coefficient of solid. Different materials have different coefficients of linear expansion, which can be considered as a constant having a defined value for a defined solid material, generally in the range of small temperature variations.

As can be seen from the formula (1) for a rod-like or rod-like solid material, when an increase DeltaL in the change in the length of the material is measured at a temperature change DeltaT, the linear expansion coefficient of the material in the temperature change region is set to be

α＝(ΔL/ΔT)*K(2)

Wherein k is constant 1/L.

From the formula (2), the measurement of the linear expansion coefficient α is actually the ratio of the elongation Δ L of the metal rod measured by heating the wire to the change Δ T of the temperature.

Therefore, the coefficient of linear expansion of the metal is difficult to measure, and the invention provides a measuring device for measuring the coefficient of linear expansion of the metal.

Disclosure of Invention

In view of the above-mentioned prior art, the present invention provides a device for measuring linear expansion coefficient of metal.

The technical scheme adopted by the invention for solving the technical problems is as follows:

the utility model provides a measuring device of coefficient of linear expansion of metal, includes computer, PASCO science workstation, guide rail chassis, symmetry sets up first fixed bolster and second fixed bolster on the guide rail chassis, be provided with LVDT displacement sensor on the first fixed bolster, be provided with metal heater on the second fixed bolster, metal heater outside cover is equipped with temperature sensor, LVDT displacement sensor with metal heater is located same water flat line, displacement sensor with metal heater all with PASCO science workstation links to each other, PASCO science workstation with the computer links to each other, wherein, the computer includes PASCO Capstone software.

In one embodiment, the LVDT displacement sensor comprises a probe, an LVDT displacement sensor housing and a rubber sleeve, wherein the probe is arranged at one end of the LVDT displacement sensor housing, and the rubber sleeve is sleeved at one end of the probe.

In one embodiment, the metal heater has a metal rod built into it to be heated.

In one embodiment, a sensor fixing knob for fixing the LVDT displacement sensor is provided on the first fixing bracket.

In one embodiment, the second fixing bracket is provided with a heater fixing knob for fixing the metal heater.

In one embodiment, the first fixing bracket and the second fixing bracket are both provided with bracket fixing knobs for fixing the first fixing bracket and the second fixing bracket on the guide rail chassis.

In one embodiment, one end of the metal heater is provided with a metal rod fixing knob.

Compared with the prior art, the invention has the beneficial effects that:

1. the traditional experiment for measuring the linear expansion coefficient of the metal uses a rotary sensor, the detection precision of the rotary sensor is not high, and the elongation of the metal rod can be measured only by carrying out secondary calculation.

2. According to the invention, the temperature sensor and the LVDT displacement sensor are combined on the PASCO scientific workstation, the numerical value of the metal linear expansion coefficient is directly obtained through the PASCO Capstone software, and error analysis is carried out, so that the data is more visual, and the average value or the optimal value can be obtained through multiple experiments.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural diagram of the LVDT displacement sensor according to the present invention.

In the figure: 1-a chassis with a guide rail; 2-fixing the bracket; 3-LVDT displacement transducer; 4-a metal heater; 5-bracket fixing knob; 6-sensor fixing knob; 7-heater fixing knob; 8-a temperature sensor; 9-metal rod fixing knob; 10-LVDT displacement sensor housing; 11-a probe; 12-rubber sleeve.

Detailed Description

In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments. In the following description, characteristic details such as specific configurations and components are provided only to help the embodiments of the present invention be fully understood. Thus, it will be apparent to those skilled in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.

It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

In various embodiments of the present invention, it should be understood that the sequence numbers of the following processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

It should be understood that the term "and/or" herein is merely one type of association relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

In the embodiments provided herein, it should be understood that "B corresponding to a" means that B is associated with a from which B can be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may be determined from a and/or other information.

The invention provides a measuring device for a metal linear expansion coefficient.

As shown in fig. 1-2, a device for measuring a linear expansion coefficient of a metal comprises a computer, a PASCO scientific workstation, a guideway chassis 1, a first fixed support and a second fixed support symmetrically arranged on the guideway chassis 1, wherein the first fixed support is provided with a LVDT displacement sensor 3, the second fixed support is provided with a metal heater 4, a metal rod to be heated is arranged in the metal heater 4, a temperature sensor 8 is sleeved outside the metal heater 4, the LVDT displacement sensor 3 and the metal heater 4 are located on the same horizontal line, the displacement sensor 3 and the metal heater 4 are both connected with the PASCO scientific workstation, and the PASCO scientific workstation is connected with the computer, wherein the computer comprises PASCO Capstone software; the LVDT displacement sensor 3 comprises a probe 11, an LVDT displacement sensor shell 10 and a rubber sleeve 12, wherein the probe 11 is arranged at one end of the LVDT displacement sensor shell 10, the rubber sleeve 12 is sleeved at one end of the probe 11, so that metal to be heated arranged in the metal heater 4 expands through the heating temperature change of the metal heater 4, the metal is further connected with the probe of the LVDT displacement sensor 3 to drive the probe to generate micro displacement, the probe is connected with the PASCO scientific workstation through the LVDT displacement sensor 3 and the temperature sensor, and then data recording and processing are carried out through PASCO Capstone software in a computer, and the experimental result of the metal linear expansion coefficient can be obtained.

Further, a sensor fixing knob 6 for fixing the LVDT displacement sensor 3 is arranged on the first fixing support, a heater fixing knob 7 for fixing the metal heater 4 is arranged on the second fixing support, wherein jacks are formed in the first fixing support and the second fixing support, specifically, the sensor fixing knob 6 and the heater fixing knob 7 are respectively located at the upper ends of the first fixing support and the second fixing support, the LVDT displacement sensor 3 is further placed in the jack of the first fixing support, the metal heater 4 is placed in the jack of the second fixing support 2, and the sensor fixing knob 6 and the heater fixing knob 7 are respectively screwed, so that relative displacement does not occur between the LVDT displacement sensor 3 and the metal heater 4 and between the first fixing support and the second fixing support.

Further, the first fixing support and the second fixing support are both provided with support fixing knobs 5 for fixing the first fixing support and the second fixing support on the guide rail chassis 1, specifically, the support fixing knobs 5 are located at feet on two sides of the first fixing support and the second fixing support, after the LVDT pen-type potential sensor 3 and the metal heater 4 are fixed, the distance between the first fixing support and the second fixing support is determined, the sensor probe 9 is made to be just contacted with one end of a metal to be measured in the metal heater 4, and the sensor fixing knobs 6 and the heater fixing knobs 7 are screwed, so that the first fixing support and the second fixing support do not generate relative displacement with the guide rail chassis 1.

Further, one end of the sensor 8 is a metal holder, the metal holder is arranged below the metal rod to be detected and connected with the metal rod to be detected, and the other end of the metal holder is connected with the PASCO workstation.

Further, one end of the metal heater 4 is provided with a metal rod fixing knob 9 for fixing the metal to be heated in the metal heater.

Further, the LVDT displacement sensor housing 10 is a 304 stainless steel metal tube, which ensures that it can stably work for a long time in severe environments such as moisture and dust, and a precise electronic circuit is arranged in the stainless steel metal tube to ensure that the device meets the precision required by the experiment.

Preferably, the tail end of the LVDT displacement sensor is connected with an electric wire which can output signals of 0-5V, 0-10V, 4-20mA or RS485, the LVDT displacement sensor is convenient to be connected with a PASCO scientific workstation for use and can directly read out a tiny displacement value, the other end of the LVDT displacement sensor is a movable probe 11, the probe 11 is wrapped with a layer of rubber sleeve 12 with good performance, and the rubber sleeve is used for protecting the probe in non-working time so as to ensure high sensitivity and accuracy of the probe.

Further, a displacement value and a temperature value transmitted by the displacement sensor are recorded in real time through PASCO Capsule software in a computer, and experimental data are processed by utilizing the PASCO Capsule software to obtain a value of the metal linear expansion coefficient.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the invention has been described in detail with reference to the foregoing illustrative embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the spirit and scope of the technical solutions of the embodiments of the present invention.