CN210487562U

CN210487562U - Friction coefficient instrument

Info

Publication number: CN210487562U
Application number: CN201921238570.9U
Authority: CN
Inventors: 丁曰东; 赵桂安
Original assignee: BINZHOU CITY INSTITUTE OF TEXTILE FIBER INSPECTION
Current assignee: BINZHOU CITY INSTITUTE OF TEXTILE FIBER INSPECTION
Priority date: 2019-07-31
Filing date: 2019-07-31
Publication date: 2020-05-08
Anticipated expiration: 2029-07-31

Abstract

The utility model discloses a coefficient of friction appearance mainly relates to cloth class fibre performance detection area. The novel horizontal shearing machine comprises a base, be equipped with the support on the base, sliding connection has the lower shear box on the base, the upper portion opening of lower shear box, be equipped with the upper shear box on the lower shear box, the upper and lower opening of upper shear box, sliding connection has the loading board in the upper shear box, be equipped with the pressurization gasbag on the loading board, the top of upper shear box is equipped with the loading top cap, the top of loading top cap is rotated and is connected with the screw rod, the top of screw rod is equipped with the runner, the screw rod run through the top of support and with support threaded connection, be equipped with the gas pump for the inflation of pressurization gasbag on the support, be equipped with the drive arrangement who promotes lower shear box horizontal migration on the base. The beneficial effects of the utility model reside in that: when the normal loading applied by the device is transmitted to the sample, the stress is more uniform, and the detection result is more accurate.

Description

Friction coefficient instrument

Technical Field

The utility model relates to a cloth class fiber material performance detection area specifically is coefficient of friction appearance.

Background

The application of the cloth fiber synthetic material is more and more extensive, especially the cloth fiber used in civil engineering, is very critical in the engineering construction, so the performance of the cloth fiber synthetic material can be ensured to be normally constructed by strict measurement; the existing tester for measuring the direct shear drawing performance generally uses an air cylinder to apply normal loading, and an improved device uses a motor, and the devices apply normal loading to a loading top cover when applying normal loading.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a coefficient of friction appearance, when its applied normal direction loading transmitted the sample, the atress is more even, can make the testing result more accurate.

The utility model discloses a realize above-mentioned purpose, realize through following technical scheme:

the friction coefficient instrument comprises a base, wherein a support is arranged on the base, a lower shearing box is connected to the base in a sliding mode, an upper opening of the lower shearing box is formed in the lower shearing box, an upper opening and a lower opening of the upper shearing box are formed in the upper shearing box, a loading plate is connected to the inner portion of the upper shearing box in a sliding mode, a pressurizing air bag is arranged on the loading plate, a loading top cover is arranged at the top of the upper shearing box, a screw rod is connected to the top of the loading top cover in a rotating mode, a rotating wheel is arranged at the top of the screw rod, the screw rod penetrates through the top of the support and is in threaded connection with the support, an air pump used for inflating the pressurizing air bag is arranged on the support.

Furthermore, a collecting groove is formed in the position, close to the bottom, of the outer side of the lower shearing box.

Furthermore, an air pressure gauge is arranged on the air pump.

Furthermore, an air nozzle is arranged on the pressurizing air bag, a clamping hole is formed in the side wall of the upper shearing box, and the air nozzle penetrates through the clamping hole and then is connected with an air pump.

Contrast prior art, the beneficial effects of the utility model reside in that:

the utility model discloses utilize the air pump to pressurize for the pressurization gasbag, apply standard soil sand with normal direction effort through the board that adds lotus, and then on transmitting the sample again, the normal direction that makes the sample receive adds lotus more evenly, when carrying out the staight scissors and drawing the experiment, can make the data of measuring displacement volume and the effort that adds lotus more accurate, the staight scissors who finally determines draws the coefficient more accurate, be favorable to the material that selectivity coefficient is more accurate in practical application, guarantee the security of relevant construction.

Drawings

Fig. 1 is a schematic perspective view of the present invention.

Fig. 2 is a left side view of the present invention.

Fig. 3 is a cross-sectional view taken along the direction a in fig. 2 according to the present invention.

Reference numerals shown in the drawings:

1. a base; 2. a support; 3. a lower shear box; 4. an upper shearing box; 5. a loading plate; 6. a pressurized air bag; 7. loading a top cover; 8. a screw; 9. a rotating wheel; 10. an air pump; 11. a drive device; 12. collecting tank; 13. a barometer; 14. an air tap; 15. and (6) clamping the hole.

Detailed Description

The present invention will be further described with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teachings of the present invention, and these equivalents also fall within the scope defined in the present application.

The utility model relates to a friction coefficient instrument, the main structure of which comprises a base 1, the base 1 is placed on the ground for providing supporting force for the instrument, universal wheels can be arranged at the bottom of the base for moving the instrument, a bracket 2 is arranged on the base 1, the bracket 2 is of an inverted U shape and is fixed on the base 1 by welding or bolts, a lower shearing box 3 is connected on the base 1 in a sliding way, the lower shearing box 3 is connected on the base 1 in a sliding way by a slide rail, the lower shearing box 3 is positioned in the range of the bracket 2, the upper opening of the lower shearing box 3 is filled with standard soil sand until the standard soil sand is flush with the opening at the top when in use, then a sample to be detected is fixed on the soil sand, an upper shearing box 4 is arranged on the lower shearing box 3, the upper shearing box 4 is fixed with the lower shearing box 3 by pins, the sizes of the two can be the same or different, the upper and lower openings of the upper shear box 4 are used, the upper shear box 4 is placed on the lower shear box 3 and fixed by pins when in use, the edge of the upper shear box 4 is noticed that the upper shear box 4 can not be contacted with a sample, then standard soil sand is added from the upper opening, a loading plate 5 is connected in the upper shear box 4 in a sliding way, the loading plate 5 is connected in a sliding way through a sliding groove arranged on the inner side wall of the upper shear box 4, the loading plate 5 is placed on the top of the soil sand after the standard soil sand is filled, a pressurizing air bag 6 is arranged on the loading plate 5, the pressurizing air bag 6 is made of rubber materials, the cross section of the pressurizing air bag after the charging is not smaller than the cross section of the loading plate 5, so as to ensure that uniform normal loading acting force is applied to the whole plane of the loading plate 5, the magnitude of the normal loading acting force is judged by testing the pressure of the pressurizing air bag 6, compared with the traditional acting force which is concentrated on one point or, the normal loading of the utility model is more uniform, the acting force on each part of the sample tends to be the same, and the accuracy of the test is improved;

the top of the upper shearing box 4 is provided with a loading top cover 7, the size of the loading top cover 7 is the same as that of the opening at the top of the upper shearing box 4, the loading top cover 7 is fixed with the upper shearing box 4 through a screw, the top of the upper shearing box 4 can be sealed, the top of the loading top cover 7 is rotatably connected with a screw 8 through a bearing, an external thread is arranged on the screw 8, a rotating wheel 9 is fixedly welded at the top of the screw 8, the screw 8 penetrates through the top of the bracket 2 and is in threaded connection with the bracket 2, an internal thread hole is arranged on the bracket 2, the screw 8 penetrates through the internal thread hole and is in threaded connection with the internal thread hole, when the rotating wheel 9 is rotated, the screw 8 can be rotated up and down to drive the loading top cover 7 at the bottom of the screw to seal or open the upper shearing box 4, and the fixing of the upper shearing box and the lower shearing box in, the air pump 10 for inflating the pressurizing air bag 6 is arranged on the support 2, the air pump 10 is fixed on the top of the support 2, and a VML900.8 standard air pump produced by Chengdian corporation is used, so that the maximum pressure can be ensured to be 100KPa, the air pump 10 is communicated with the pressurizing air bag 6 through an air pipe, in the process of inflating the pressurizing air bag 6, the pressurizing air bag 6 expands to push the loading plate 5 to apply normal loading to standard soil and sand, the stress is more uniform, the condition that the pressurizing air bag 6 is damaged and air leakage is caused by direct contact of the pressurizing air bag 6 and the soil and sand is avoided, a driving device 11 for pushing the lower shearing box 3 to move horizontally is arranged on the base 1, scale marks are arranged on the base 1 along the horizontal movement direction, the horizontal displacement is conveniently recorded, in the detection process, the lower shearing box 3 is pushed by the driving device 11 to move horizontally relative to the upper shearing box 4, the displacement is recorded, and the loading, and then the direct shear drawing coefficient is calculated, the driving device 11 may use a linear motion device commonly used in the prior art, may use an electric push rod, and may also use a motor to drive by using a screw slider, which is not described herein as an invention point.

Preferably, the position that is close to the bottom in the box 3 outside of cuting down is equipped with collecting vat 12, the standard sand that solidifies in the box 4 of cuting up, certainly have some granule concretions insecurely, and the in-process of box 3 of cuting down in the horizontal migration can make the sand in the box 4 of cuting up fall out, collecting vat 12 can be collected the sand that drops, prevents to make dirty base 1, guarantees test environment's cleanness, also avoids producing the horizontal slip of box 3 of cuting down and hinders, guarantees the accuracy of test.

Preferably, the air pump 10 is provided with a barometer 13, and the magnitude of the normal loading acting force can be read more conveniently by observing the reading of the barometer 13, so that the final result can be calculated conveniently.

Preferably, be equipped with air cock 14 on the pressurization gasbag 6, set up one-way pneumatic valve on the air cock 14, prevent pressurization gasbag 6 gas leakage, it has card hole 15 to open on the lateral wall of shearing box 4 to go up, air cock 14 passes and links to each other with air pump 10 behind the card hole 15, places pressurization gasbag 6 on loading plate 5 earlier when the installation, and the position card of air cock 14 is in card hole 15, connects air cock 14 and air pump 10 through the trachea, leaves sufficient space for air cock 14, avoids crushing air cock 14 in the inflation process of pressurization gasbag 6, hoisting device's life.

The using method comprises the following steps: placing a lower shear box 3 on a base 1, removing an upper shear box 4, and filling standard soil and sand in the lower shear box 3, wherein the soil and sand are flush with the top surface of the lower shear box; covering the sample on the top of the soil sand of the lower shear box 3, fixing the sample by glue, placing the upper shear box 4, inserting the fixing pins of the upper shear box and the lower shear box, ensuring that the edge of the upper shear box 4 is not contacted with the sample, and carefully filling (compacting) the soil in the upper shear box 4 according to the density and state required by the engineering; sequentially placing and fixing a loading plate 5, a pressurizing air bag 6 and a loading top cover 7, inflating the pressurizing air bag 6 by using an air pump 10, applying normal pressure, starting consolidation, wherein the time required by consolidation is different according to soil property and drainage conditions, and the consolidation degree can refer to SL 237-1999 geotechnical test regulations; adjusting a driving device 11 for horizontal loading, enabling a horizontal ejector rod to just contact with a lower shearing box 3 of a sample, pulling out a nail, starting the driving device 11, starting shearing, measuring, reading and recording displacement, water thrust and normal loading force, wherein the displacement rate depends on soil property, and 5mm/min is preferably selected for sandy soil according to SL 237-1999 geotechnical test regulations; continuously shearing, and stopping the test when the displacement reaches 6 mm; the sample is changed, another normal pressure is applied, and the above steps are repeated to complete the entire test.

Claims

1. The coefficient of friction appearance, its characterized in that: comprises a base (1), a bracket (2) is arranged on the base (1), a lower shearing box (3) is connected on the base (1) in a sliding way, the upper part of the lower shearing box (3) is provided with an opening, the lower shearing box (3) is provided with an upper shearing box (4), the upper and lower openings of the upper shearing box (4), a loading plate (5) is connected in the upper shearing box (4) in a sliding way, a pressurizing air bag (6) is arranged on the loading plate (5), a loading top cover (7) is arranged at the top of the upper shearing box (4), the top of the loading top cover (7) is rotationally connected with a screw rod (8), the top of the screw rod (8) is provided with a rotating wheel (9), the screw rod (8) penetrates through the top of the bracket (2) and is in threaded connection with the bracket (2), an air pump (10) for inflating the pressurizing air bag (6) is arranged on the bracket (2), and a driving device (11) for pushing the lower shearing box (3) to horizontally move is arranged on the base (1).

2. The apparatus of claim 1, wherein: and a collecting groove (12) is arranged at the position, close to the bottom, of the outer side of the lower shearing box (3).

3. The apparatus of claim 1, wherein: an air pressure gauge (13) is arranged on the air pump (10).

4. The apparatus of claim 1, wherein: an air tap (14) is arranged on the pressurizing air bag (6), a clamping hole (15) is formed in the side wall of the upper shearing box (4), and the air tap (14) penetrates through the clamping hole (15) and then is connected with an air pump (10).