CN103091245A - Device and method for measuring poultry egg static friction coefficient - Google Patents

Abstract

The invention discloses a device and a method for measuring the static friction coefficient of poultry eggs. The base rotates and connects the left end of the supporting roller bracket through a first rotating shaft, and a spiral lifter is connected under the right end of the supporting roller bracket; the upper surface of the supporting roller bracket is provided with two A supporting roller; the front side of the supporting roller bracket is provided with a digital display angle measuring instrument composed of a measuring rod, a reference rod and a second rotating shaft; the screw lifter is manually driven to change the inclination angle of the supporting roller bracket. When inclining, stop driving the screw lifter, read the inclination angle formed between the bottom surface of the support roller bracket and the upper surface of the base by the digital display angle measuring instrument; obtain the average value of the inclination angle after repeating for each sample

;according to the formula

Obtain the static friction coefficient f between poultry eggs and support rollers; by changing the material and processing quality of support rollers, the measurement of static friction coefficients between poultry eggs, irregular spheres and spherical materials and other samples and different materials can be realized.

Description

Device and method for measuring static friction coefficient of poultry eggs

technical field

The invention belongs to the detection technology of the mechanical properties of food materials, and in particular relates to a measuring device and a measuring method for the frictional mechanical properties of poultry eggs, in particular to a measuring device and a measuring method for the static friction coefficient of poultry eggs. the

Background technique

The friction coefficient of poultry eggs is an important basic characteristic parameter of dynamic analysis in poultry egg sorting and grading process. The friction characteristics between poultry eggs and the working parts in contact directly affect the performance of the working device. For example, in the automatic orientation arrangement of poultry eggs, the poultry eggs are driven by the static friction of the support rollers to move along the axial direction of the support rollers, and in the flip orientation area, the poultry eggs move between the limit guide rod and the support rollers. Under the action of its static friction force, it can turn over, so that the eggs can be automatically oriented and arranged in different sizes. the

Cheng Hongsheng and others studied the measurement of the static friction coefficient of litchi shell (Cheng Hongsheng et al. Experimental Research on the Measurement of Friction Coefficient of Litchi Shell [J]. Journal of Yanbian University Agronomy, 2009,31(3):209-213.), in order to overcome the When the tilting plate of the measuring device slides up and down, the lychee shell is taken, cut and pasted on the slider to make a sample. The production of the sample is cumbersome, and the contact condition between the lychee shell and the contact material is changed. The measuring device And the measurement method is not applicable to the samples with shells that are easy to turn over. Mou Guanghui et al studied the measurement of forest tree seed static friction coefficient (Mu Guanghui et al. Experimental research on forest tree seed static friction coefficient [J]. Journal of Northeast Forestry University, 1994,2(2):37-40.), in order to measure the seed population Static friction coefficient, seeds are packed in bottomless boxes, but the problem of easy contact between the bottom of the bottomless box and the working surface of the flat plate to be tested is not easy to solve, and it is not suitable for fragile and large-sized poultry eggs. At present, there are no relevant literature reports at home and abroad on the determination of the coefficient of static friction of poultry eggs. the

Contents of the invention

The object of the present invention is to provide a device and method for measuring static friction coefficient of poultry eggs with simple structure, easy operation and strong applicability. the

In order to achieve the above object, the technical scheme adopted by the poultry egg static friction coefficient measuring device of the present invention is: comprise a base, the base rotates and connects the left end of the support roller bracket through the first rotating shaft, the right end of the support roller bracket is the movable end, the bottom of the movable end Connect the screw lifter; the upper surface of the support roller bracket is provided with two support rollers of equal diameter, mutually spaced and parallel, and the axial direction is from left to right; the front side of the support roller bracket is provided with a measuring rod, a reference rod and a second The digital display angle measuring instrument composed of rotating shafts, the left end of the measuring rod and the left end of the reference rod are connected through the second rotating shaft, the measuring rod is fixedly connected with the front of the support roller bracket, the bottom surface of the reference rod is fixedly connected with the upper surface of the base, the second rotating shaft is connected with the upper surface of the base The first axis of rotation is coaxial. the

；4）根据公式

求得禽蛋与支撑辊子之间的静摩擦系数f。 The technical scheme adopted by the method for measuring the coefficient of static friction of poultry eggs in the present invention has the following steps: 1) After bonding the end points of the long axis diameters of poultry eggs, put them between two support rollers as a sample, and manually drive the screw lifter to make the support rollers The roller bracket rotates around the first rotation axis to change the inclination angle of the supporting roller bracket. The measuring rod of the digital display angle measuring instrument rotates with the supporting roller bracket. When the egg tends to slide, stop driving the screw lifter. The angle measuring instrument reads the inclination angle φ formed between the bottom surface of the support roller bracket and the upper surface of the base; 3) Repeat step 1) and step 2) for each sample to obtain the average value of the inclination angle φ

;4) According to the formula

Obtain the coefficient of static friction f between the egg and the support roller.

The present invention has the following advantages after adopting the above-mentioned technical scheme:

1. The present invention utilizes a digital display angle measuring instrument and a screw jack to make the measuring device easy to operate and simple in overall structure.

2. The present invention utilizes 2 (or more) poultry eggs bonded at the end points of the long axis diameters to form a whole, and supports them with cylindrical support rollers, which overcomes the problem of poultry eggs winding around the long and short circumferences when the support surface is inclined. scroll. the

3. The materials of the supporting rollers of the present invention can be changed, and the diameter and center distance can be adjusted, so that the contact condition between the poultry eggs and the supporting rollers is real, and the static friction coefficient between the poultry eggs and the supporting rollers can be more accurately characterized. the

4. The present invention can realize the measurement of the coefficient of static friction between samples such as poultry eggs, irregular spheres and sphere materials and different materials by changing the material and processing quality of the supporting rollers. the

5. The present invention is not only applicable to various poultry eggs, but also to other irregular spheres and spherical materials, providing an important characteristic parameter static friction coefficient for dynamic analysis in the process of sorting and grading poultry eggs, irregular spheres and sphere materials, and providing Eggs and irregular spheres and surface quality analysis of sphere materials provide evaluation parameters. the

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail;

Fig. 1 is the front view of poultry egg static friction coefficient measuring device schematic diagram of the present invention;

Fig. 2 is the top view of Fig. 1;

In the figure: 1. base; 2. supporting roller bracket; 3. supporting roller; 4. screw lifter; 5. poultry eggs; 6. digital display angle measuring instrument; .The measuring rod of the digital display angle measuring instrument; 10. The reference rod of the digital display angle measuring instrument; 11. The rotation axis of the digital display angle measuring instrument; 12. The horizontal correction blister (attached to the reference rod) of the digital display angle measuring instrument 13. Support the axis of rotation of the roller holder,

Detailed ways

As shown in Fig. 1 and Fig. 2, the bottom of poultry egg static friction coefficient measuring device of the present invention is base 1, and the left end of support roller support 2 is connected with base 1 by rotating shaft 13 rotations, and the right end of support roller support 2 is movable end. An intermediate rod 7 fixedly connected with the support roller support 2 is set at the front and back middle position of the support roller support 2, and two support rollers 3 are installed on the upper surface of the support roller support 2, and the axial direction of the two support rollers 3 is from left to In the right direction, the two supporting rollers 3 have equal diameters and are parallel to each other at a certain center distance. The left and right ends of the supporting roller bracket 2 have waist-shaped long holes for installing the supporting rollers 3, so that the center distance between the two supporting rollers 3 can be adjusted. the

The digital display angle measuring instrument 6 is installed on the front front side of the support roller bracket 2, the digital display angle measuring instrument 6 is made up of the measuring rod 9, the reference rod 10 and the rotating shaft 11, and the left end of the measuring rod 9 and the reference rod 10 are rotated The shaft 11 is connected together, the measuring rod 9 is fixedly connected with the front of the supporting roller bracket 2, the bottom surface of the reference rod 10 is fixedly connected with the upper surface of the base 1, and the axis of the rotating shaft 11 is connected with the rotating shaft of the supporting roller bracket 2. The axes of 13 coincide (being coaxial). In this way, when the support roller support 2 rotates along the rotation axis 13 , the measuring rod 9 of the digital display angle measuring instrument 6 rotates with the support roller support 2 . the

Place two poultry eggs 5 bonded at the ends of the long axis diameters between the two support rollers 3, and connect the spiral lifter 4 below the middle rod 7 at the right end of the movable end of the support roller bracket 2, and the middle rod 7 is vertically supported by the spiral lifter 4 , along with the lifting of the spiral lifter 4 screw, the inclination angle φ of the support roller bracket 2 will change. A free-running wheel 8 is set on the top of the screw rod of the screw lifter 4, which is used to lift the support roller bracket 2 smoothly.

。根据静摩擦系数f与倾斜角度之间的关系，其计算公式为

，即可以求得该组禽蛋5与支撑辊子3之间的静摩擦系数。  When the device for determining the coefficient of static friction of poultry eggs of the present invention is measuring, utilize the horizontal correction blister on the reference rod 10 of the digital display angle measuring instrument 6, and correct the measuring device to make it level; The poultry eggs 5 bonded at the ends of the shaft diameters are placed between the two support rollers 3; the screw lifter 4 is manually driven to rotate the support roller bracket 2 around the rotation shaft 13, and the inclination angle of the support roller bracket 2 is changed. When the egg 5 has a tendency to slide, stop driving the screw lifter 4. At this time, an angle is formed between the bottom surface of the support roller bracket 2 and the upper surface of the base 1. This angle is the measuring rod 9 and the angle measuring instrument 6. The included angle between the reference rods 10 is the inclination angle φ of the supporting roller bracket 2 , and the value of the inclination angle φ can be directly read by the digital display angle measuring instrument 6 . Each sample is repeatedly placed between two support rollers 3 and the inclination angle of the support roller bracket 2 of the corresponding sample is repeatedly measured to obtain the average value of the inclination angle φ

. According to the relationship between the coefficient of static friction f and the angle of inclination, the calculation formula is

, that is, the coefficient of static friction between the group of poultry eggs 5 and the support roller 3 can be obtained.

The assay method of the present invention will be described in detail below by 3 examples:

Example 1

为29.6±2.6°；根据静摩擦系数f与倾斜角度φ之间的关系，其计算公式为

，即可以求得10对草鸡蛋与支撑辊子3之间的静摩擦系数f为0.57±0.06。 Take 100 grass eggs, bond the end points of the long axis diameter with an adhesive, and combine them into 50 pairs of grass eggs, put the 50 pairs of grass eggs between the two supporting rollers 3, and the supporting rollers 3 are made of 1010 nylon ; Drive the screw lifter 4 by hand to rotate the support roller bracket 2 upwards, change the inclination angle of the support roller bracket 2, stop driving the screw lifter 4 when it is observed that the grass eggs have a sliding tendency, and pass the digital display angle measuring instrument 6 Read the value of the inclination angle φ of the support roller bracket 2 at this time; repeat the operation 3 times for each pair of samples, and repeat 150 times for 50 pairs of grass eggs, and obtain the average value of the inclination angle φ

is 29.6±2.6°; according to the relationship between the static friction coefficient f and the inclination angle φ , the calculation formula is

, That is to say, the coefficient of static friction f between 10 pairs of grass eggs and the support roller 3 is 0.57±0.06.

Example 2

为27.6±2.2°；根据静摩擦系数f与倾斜角度φ之间的关系，其计算公式为，即可以求得10对洋鸡蛋与支撑辊子3之间的静摩擦系数f为0.52±0.05。 Take 100 foreign eggs, bond the end points of the long axis diameter with an adhesive, and combine them into 50 pairs of foreign eggs, put the 50 pairs of foreign eggs between the two supporting rollers 3, and the supporting rollers 3 are made of 1010 nylon ; Drive the screw lifter 4 by hand to rotate the support roller bracket 2 upwards, change the inclination angle of the support roller bracket 2, stop driving the screw lifter 4 when it is observed that the egg has a sliding tendency, and pass the digital display angle measuring instrument 6 Read the value of the inclination angle φ of the support roller bracket 2 at this time; then repeat the operation 3 times for each pair of samples, and repeat 150 times for 50 pairs of foreign eggs, and obtain the average value of the inclination angle φ

is 27.6±2.2°; according to the relationship between the static friction coefficient f and the inclination angle φ , the calculation formula is , That is to say, the coefficient of static friction f between 10 pairs of foreign eggs and the support roller 3 is 0.52±0.05.

Example 3

为20.2±3.1°；根据静摩擦系数f与倾斜角度φ之间的关系，其计算公式为，即可以求得10对鸭蛋与支撑辊子3之间的静摩擦系数f为0.37±0.06。 Take 100 duck eggs, bond the end points of the long axis diameter with an adhesive, and combine them into 50 pairs of duck eggs, put the 50 pairs of duck eggs 5 between the two supporting rollers 3 respectively, and the supporting rollers 3 are made of 1010-type nylon; Drive the screw lifter 4 to rotate the bracket 2 supporting the roller 3 upwards, change the inclination angle of the support roller bracket 2, stop driving the screw lifter 4 when it is observed that the duck eggs have a tendency to slide, and read it through the digital display angle measuring instrument 6 Obtain the numerical value of the inclination angle φ of the supporting roller bracket 2 at this time; repeat the operation 3 times for each pair of samples, and repeat 150 times for 50 pairs of duck eggs, and obtain the average value of the inclination angle φ

is 20.2±3.1°; according to the relationship between the static friction coefficient f and the inclination angle φ , the calculation formula is , That is, the coefficient of static friction f between 10 pairs of duck eggs and the support roller 3 can be obtained as 0.37±0.06.

Claims (5)

1. A device for measuring the coefficient of static friction of poultry eggs, comprising a base (1), characterized in that: the base (1) is connected to the left end of the supporting roller bracket (2) through the first rotating shaft (13), and the supporting roller bracket (2) ) is the movable end, and the lower part of the movable end is connected with the screw lifter (4); the upper surface of the support roller bracket (2) is provided with two equal-diameter support rollers ( 3); the front side of the support roller bracket (2) is set, the digital display angle measuring instrument (6) composed of the measuring rod (9), the reference rod (10) and the second rotating shaft (11), the measuring rod (9 ) and the left end of the reference rod (10) are connected through the second rotating shaft (11), the measuring rod (9) is fixedly connected with the front of the support roller bracket (2), and the bottom surface of the reference rod (10) is fixed to the upper surface of the base (1) Connecting, the second rotating shaft (11) is coaxial with the first rotating shaft (13). 2. The device for measuring the coefficient of static friction of poultry eggs according to claim 1, characterized in that: an intermediate rod (7) fixedly connected to the supporting roller bracket (2) is set at the front and rear middle positions of the supporting roller bracket (2) , the bottom of the middle rod (7) is connected with the screw lifter (4). 3. The device for measuring the coefficient of static friction of poultry eggs according to claim 1, characterized in that: the top of the screw of the screw lifter (4) is provided with a rotating wheel (8). 4. A device for measuring the coefficient of static friction of poultry eggs according to claim 1, characterized in that: the left and right ends of the support roller bracket (2) are provided with waists that can adjust the center distance between the two support rollers (3). shaped long hole. 5. a method for measuring poultry egg static friction coefficient measuring device as claimed in claim 1, is characterized in that comprising the steps: 1) After bonding the end points of the long axis diameter of the poultry egg, put it as a sample between the two support rollers (3), and manually drive the screw lifter (4), so that the support roller bracket (2) revolves around the first rotation axis ( 13) Rotate to change the inclination angle of the support roller bracket (2), the measuring rod (9) rotates with the support roller bracket (2), and stop driving the screw lifter (4) when the poultry eggs tend to slide; 2) The inclination angle φ formed between the bottom surface of the support roller bracket (2) and the upper surface of the base (1) is read by the digital display angle measuring instrument (6); 3) Repeat step 1) and step 2) for each sample to obtain the average value of the inclination angle φ

; 4) According to the formula

Obtain the coefficient of static friction f between the poultry egg and the support roller (3).

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