阅读说明：本技术 一种微小力测试装置 (Micro-force testing device ) 是由 张军 于 2019-11-25 设计创作，主要内容包括：本发明涉及一种微小力测试装置,其特征在于：包括了具有一腔体的缸套、盛放于腔体内的液体、漂浮于液体上的柱塞,以及倾斜设置在筒体外周壁上、且与筒体连通的透明的测量管,所述缸套的腔体的内径为第一内径D,所述测量管的内径为第二内径d,其中,第二内径d远小于第一内径D,以提供一种结构简单、测试方便的微小力测试装置。(The invention relates to a micro-force testing device, which is characterized in that: the cylinder sleeve with the cavity, the liquid contained in the cavity, the plunger floating on the liquid and the transparent measuring tube obliquely arranged on the peripheral wall of the cylinder body and communicated with the cylinder body are included, the inner diameter of the cavity of the cylinder sleeve is a first inner diameter D, the inner diameter of the measuring tube is a second inner diameter D, wherein the second inner diameter D is far smaller than the first inner diameter D, and the small force testing device with the simple structure and the convenience in testing is provided.)

1. A micro force testing device is characterized in that: the cylinder liner that has a cavity, hold in the cavity liquid, float the plunger on liquid to and the slope sets up on the barrel periphery wall, and with the transparent survey buret of barrel intercommunication, the internal diameter of the cavity of cylinder liner is first internal diameter D, the internal diameter of surveying the buret is second internal diameter D, and wherein, second internal diameter D is far less than first internal diameter D.

2. The minute force testing apparatus according to claim 1, characterized in that: the second inner diameter D and the first inner diameter D conform to the relation: d: d is less than or equal to 1: 100.

3. the minute force testing apparatus according to claim 1, characterized in that: the cavity is a cylindrical cavity, and the plunger is a cylindrical cylinder.

4. The minimal force testing device of claim 1, wherein the cylinder sleeve is placed on the water surface, and an included angle between the measuring pipe and the water surface is α, wherein an included angle is equal to or larger than 5 degrees and equal to or smaller than α degrees and equal to or smaller than 30 degrees.

5. The minute force testing apparatus according to claim 1, characterized in that: the measuring tube has a scale extending along its length on its wall.

6. The minute force testing apparatus according to claim 1, characterized in that: the cylinder sleeve structure is characterized by further comprising a base, wherein a blind hole is vertically formed in the base, and the lower portion of the cylinder sleeve is inserted into the blind hole in a clearance fit mode and is fixed.

7. The minute force testing apparatus according to claim 6, characterized in that: the base is also provided with supporting legs with horizontal adjusting function.

Technical Field

The invention relates to the field of force value testing, in particular to a micro force testing device.

Background

Many occasions in industrial engineering involve the test of tiny force value, especially all involve the test of tiny force value under 1N in many aspects such as micro-mechanism assembly, film and fiber mechanical property test. The current methods for measuring force values are mechanical lever methods, spring tension or compression methods, capacitive force sensors, optical methods, and the like. Some of the methods have complex structures and are easy to damage, some have low testing precision, some have high manufacturing precision requirements and high manufacturing cost, some cannot test tiny force values (such as force values of Newton or less than 1 Newton), and the like. Therefore, the invention provides a testing device capable of testing a tiny force value.

Disclosure of Invention

The invention aims to provide a micro-force testing device which is simple in structure and convenient to test.

The specific scheme is as follows:

the utility model provides a small power testing arrangement, has included the cylinder liner that has a cavity, hold in the cavity liquid, float the plunger on liquid to and the slope sets up on the cylinder liner periphery wall, and with the transparent survey buret of cylinder liner intercommunication, the internal diameter of the cavity of cylinder liner is first internal diameter D, the internal diameter of surveying the buret is second internal diameter D, and wherein, second internal diameter D is far less than first internal diameter D.

Further, the second inner diameter D and the first inner diameter D conform to the relationship: d: d is less than or equal to 1: 100.

further, the cavity is a cylindrical cavity, and the plunger is a cylindrical cylinder.

Further, the cylinder sleeve is placed on the water surface, the included angle between the measuring pipe and the water surface is α, and the included angle is not less than 5 degrees and not more than α degrees and not more than 30 degrees.

Furthermore, the pipe wall of the measuring pipe is provided with a scale extending along the length direction of the measuring pipe.

Furthermore, the cylinder sleeve further comprises a base, wherein the base is provided with a vertically arranged blind hole, and the lower part of the cylinder sleeve is inserted into the blind hole in a clearance fit manner and is fixed.

Furthermore, the base is also provided with supporting legs with a horizontal adjusting function.

Compared with the prior art, the micro-force testing device provided by the invention has the following advantages: the micro-force testing device provided by the invention has the advantages that the inner diameter of the measuring pipe is far smaller than that of the cylinder sleeve, so that the liquid level change caused by the small downward movement of the plunger under the action of the micro force F can be greatly changed in the measuring pipe and is easy to measure, and the micro-force testing device can test an extremely small force value, is simple in structure and easy to implement and operate.

Drawings

Fig. 1 shows a schematic view of a micro-force testing apparatus.

Fig. 2 shows a state diagram of the minute force testing apparatus before the minute force acts.

Fig. 3 shows a state diagram of the minute force testing apparatus after the minute force acts.

Detailed Description

To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

The invention will now be further described with reference to the accompanying drawings and detailed description.

As shown in fig. 1, the present embodiment provides a minute force measuring apparatus, which includes a cylinder casing 10 having a first inner diameter D, a liquid 20 contained in the cylinder casing 10, a plunger 30 floating on the liquid, and a measurement pipe 40 obliquely disposed on the outer peripheral wall of the cylinder casing and communicating with the cylinder casing 10, the measurement pipe 40 having a second inner diameter D, wherein the second inner diameter D is much smaller than the first inner diameter D, and particularly preferably, D: d is less than or equal to 1: 100.

the cylinder sleeve 10 is vertically arranged, the liquid 20 contained therein can be non-volatile liquid such as water, and the selection of the liquid 20 depends on the magnitude of the force to be measured, and the liquid 20 is taken as water in the example for illustration. Pigments may also be added to the liquid for viewing.

The plunger 30, which has an overall density less than that of the liquid 20 so that it can float on the liquid 20, may be a solid body made of a material having a density less than that of the liquid or a hollow body made of a material having a density greater than that of the liquid. In this embodiment, a solid body made of nylon is exemplified. The plunger 30 in this embodiment is inserted into the water in the cylinder casing 10, and due to buoyancy, the lower portion of the plunger 30 is submerged in the water and the upper portion is exposed above the water surface.

The measuring tube 40 in this embodiment is a transparent thin tube, and the outer wall of the measuring tube 40 is provided with a scale 41 for measuring the displacement of the liquid level in the measuring tube 40.

The principle of the minute force value measuring device provided in this embodiment is shown in fig. 2 and 3 (for simplicity, the scale 41 on the measuring pipe 40 is omitted in fig. 2 and 3).

Fig. 2 shows a state before a minute force acts. In this state, the plunger 30 in the cylinder casing 10 floats on the liquid 20, and the gravity Fg and the buoyancy Fb of the plunger 30 are balanced, and at this time, the cylinder casing10 and the height of the liquid level in the measuring tube 40 is H₀。

When the upper end of the plunger 30 is subjected to a slight force F, the condition is shown in fig. 3. At this time, the plunger 30 is lowered by a small force F, so that the liquid level in the cylinder casing 10 and the measurement pipe 40 rises to a height H₁. The plunger 30 is under a slight force F, and the gravity force Fg establishes a new equilibrium with the buoyancy force Fb'.

According to the force balance equation, the tiny force F is equal to the weight of the rising water body in the cylinder sleeve and the inclined transparent pipe. For the sake of calculation, the cylinder casing 10 and the plunger 30 in this example are both cylindrical in shape. The force balance equation is therefore:

in the formula: d is the inner diameter of the cylinder liner 10, D₁D is the inner diameter of the measuring pipe 40, and Δ H is the rise height of the liquid level in the cylinder liner 10 and the measuring pipe 40, i.e., Δ H ═ H₁-H₀L is the displacement of the water surface in the measuring tube 40 along the tube length direction, ρ is the density of the water in the cylinder liner, and g is the gravitational acceleration.

Assuming that the angle between the measurement pipe 40 and the horizontal is α, Δ H ═ lsin α, and the equation (1) is substituted, we can obtain:

where l is the displacement of the water surface in the measuring tube 40 in the tube length direction, and is measured by a scale of the measuring tube 40, the force acting on the plunger can be obtained by equation (2).

Assuming that D is 0.01m, D₁＝0.008m，d＝0.003mm，ρ＝1000kg/m³，g＝9.8m²(vi)/s, α ═ 30 ℃, when l is a reading of 1mm, F can be calculated to be 6.927 × 10 from the above formula (2)^-5N。

Because the inner diameter of the measuring tube 40 is much smaller than the inner diameter of the cylinder sleeve 10, the plunger 30 moves down slightly under the action of the small force F, and the liquid level change caused by the plunger moves greatly in the measuring tube 40, so that the plunger is easy to measure.

In this embodiment, the angle α between the measurement tube 40 and the horizontal can be sized according to the magnitude of the force being measured, with the angle α preferably being between 5 ° and 30 °.

In the present embodiment, it is preferable that a base 50 is further included, and the base 50 has a vertically arranged blind hole (not shown in the figure) in which the cylinder liner 10 is inserted and fixed with a clearance fit. More preferably, the base 50 further has a support leg (not shown) with a horizontal adjusting function to ensure that the cylinder liner 10 is in a horizontal state.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.