Woven belt shock absorber to suppress impact load

FIELD: textile, paper.

SUBSTANCE: invention relates to improvement of woven belt shock absorbers to suppress impact load by absorption of kinetic energy in case of high-speed loading. Woven belt shock absorber for suppression of impact load comprises two background layers arranged by weaving of warp and weft threads, and connecting warp threads embedded serially into each of layers to form cells between them. Section of weft thread forming in changeover from one background layer into the other has length more than length of section from connecting warp threads between background layers. All specified sections of weft thread are arranged at least at one lateral side of belt and form sagging weft pieces free of warp threads and changing from layer into layer, protruding over belt width and forming stitch edge similar to fringe.

EFFECT: increased uniformity of braking force, which provides for reliability of operation.

2 cl, 4 dwg

 

The invention relates to improvements in woven tape absorbers for damping impact load due to the absorption of kinetic energy at high speed loading. Such shock absorbers are used in safety belt builders, installers high-altitude, treetop and mountain climbers, suspensions parachute lines, including those used in the dropping of heavy equipment, brake grid devices for emergency stopping of vehicles and aircraft carrier-based aircraft, tow ropes and other devices operating in the conditions of occurrence of sudden shock loads that require repayment of the kinetic energy at a level that prevents or greatly reduces the chance of injury to human or mechanical damage technical objects.

In the prior art woven tape absorbers for damping impact load, the principle of which is based on providing successive destruction of the elements connecting the bearing (power) tape, conditionally divided into four basic types.

The first type are woven tape absorbers, representing at least two folded carrier tape, stitched sewing threads across tapes. In such absorbers destructible connecting elements of load-bearing tapes are sewing CTE is key. The technology of manufacture of this type of shock absorbers requires special sewing equipment, matching sewing thread and sewing mode, reducing the possibility of excision put power strips when flashing. The prior art dampers of the type described reflect the following, the most typical earlier patented invention (foreign patents and copyright certificates of the USSR):

Pat. UK No. 407838, 1934; U.S. Pat. UK No. 2292782, 1996; U.S. Pat. Germany No. 4005563, 1991; U.S. Pat. U.S. No. 1935339, 1933; U.S. Pat. U.S. No. 3937407, 1976; U.S. Pat. U.S. No. 3804698, 1974; U.S. Pat. U.S. No. 3074760, 1963; U.S. Pat. U.S. No. 4100996, 1978; U.S. Pat. U.S. No. 3444957, 1969; U.S. Pat. U.S. No. 5174410, 1992; U.S. Pat. Canada No. 2480609, 2006; international publication WO 0247764, 2002; U.S. Pat. Japan No. 40-49978, 1992.

The second type consists of textile absorbers, in which instead of stitching using a separate connecting elements connecting carrier tapes according to the type of the node, tightening the belt or harness from tearing or slipping along the tape during application to the ends of the tapes power load, Pat. France No. 2851924, 2004, or form a stacked-in loop power tapes looped elastic areas, lengthening under load, Pat. U.S. No. 6085802, 2000.

The third type are first developed in the USSR woven absorbers, representing two teletone looped tape loop which employees torn elements, consequently povezani between a type of knitted weave, auth. mon. The USSR №1147412, 1985; ed. mon. The USSR №1194428, 1985; ed. mon. The USSR №2023071, 1994. Woven absorbers of this type do not have the disadvantages sewn together, so as not to have torn sewing stitches, also provide damping of shock loads on the estimated thresholds of load application, but require manual connection of stitches with knitting needles.

The fourth type consists of woven textile absorbers, power (bearing) of the tape which are interconnected in the process of weaving the overall torn when the application loads, the warp threads that extend from a tape in the tape (from layer to layer), ed. mon. The USSR №937558, 1982; ed. mon. The USSR №1607829, 1990; ed. mon. The USSR №1172954, 1985; U.S. Pat. Japan No. 58-220845, 1983. These sources the technical nature relevant and are the most similar analogues to the claimed invention, as torn elements in each of them serve the warp threads, forming in the process of weaving together with bearing strips single woven piece. Manufacturing technology telnetting damper on the principle of weaving coupons representing repeated along the length of the strip semi-finished products of a given shape, the most productive and provides only the subsequent cutting down from the loom long tape to separate the coupons and the stitching on the edges of the cut pieces of leprosy mounting, thus obtained ready-to-use textile absorber.

The closest of these analogues is the invention described in the ed. mon. The USSR №1172954 and selected as the prototype for most of the matching essential attributes. In the prototype when using woven tapes made on odnozadachnoy the loom, the absorption of the kinetic energy is not only due to the destruction of connective main thread, but due to the destruction of indigenous weft threads on the site of transition from one background layer to another. If the length of this section is equal to or less than the length of the area formed by connecting the main threads in the transition from one background layer to another, the weft thread can be loaded and break down sooner than the area of connection of the main threads of this cell. Therefore, the loading of this weft yarn occurs at the site of the background layer to its maximum loading. Therefore, the weft thread can quite easily stand out from the background layer, which in its width, and, therefore, reduce its carrying capacity, and may result in uneven braking effort.

The objective of the invention is to remedy these disadvantages and provide a technical result as increasing the uniformity of effort is Imogene due to the discrete redistribution application tearing efforts to the warp and weft threads with the increase in the carrying capacity of the background layer by eliminating the ease of pulling the weft yarn from the background layer and tightening its width under the influence of the power load.

The task and the technical result is achieved by the fact that in the woven tape absorber for damping impact load that contains two background layer, performed by the interweaving of indigenous primary and weft threads, and connecting the main thread, earned sequentially in each of the layers with the formation between cells, the site of root filling thread formed at the transition from one background layer to another, has a length greater than the length of the site from the main connective threads between the two background layers, all of these areas indigenous weft yarns located in at least one lateral side of the ribbon and form passing from layer to layer sagging and free from warp weft drawing, projecting beyond the width of the tape and forming a similar looped fringe edge. Plot the root filling thread formed at the transition from one layer to another, may consist of two indigenous weft threads, and formed their hinge edge may be located on both sides of the tape or alternate along the length of the different sides of the tape in a checkerboard pattern. The essential characteristics of the shock absorber provides increased energy consumption and reliability of the shock absorber in the manufacture of woven tape on the od of chelnochno loom.

When the site root filling thread formed at the transition from one background layer to another, has a length greater than the length of the section from the junction of the main threads in the transition from one background layer to another, then this section of the weft yarn in the form of relatively sagging broaches (looped behrampada edge) starts to be loaded after filling and destroyed at least one transition area connecting the basics from one background layer to another. Therefore, if, for example, the braking force dampening device 300 kgf, the destruction of the weft yarn will occur when the area of the background layer will be loaded up to 300 kgs. Under this condition the weft thread will be firmly clamped in the background layer with effort, excluding its uncontrolled stretching and contraction of the width of the background layer of the tape, which, in turn, significantly improves the reliability and uniformity of braking effort when working cushioning device.

Using the above opportunity durable fastening of the weft yarn in the background layer in the process damping device, it seems promising to use this technique to increase the intensity of the device due to the simultaneous loading and fracture more weft threads. This m what should be achieved, if the section of the weft yarn, which is formed at the transition from one background layer to another, consists of at least two indigenous weft threads.

On figa) and (b) schematically shows a side view of the woven belt shock absorber;

on figa) and (b) is a longitudinal section of a woven tape of the shock absorber;

figure 3 - side view (end) hand woven shock absorber;

figure 4 - diagram of the damping load from the extension.

In woven tape damper position 1 marked background layers, 2 - connecting the main thread; 3 - indigenous weft threads and plot in the transition from one background layer to another. From figure 1 it is obvious that if the site root weft yarn 3 more section 2 connecting the main filaments formed in the transition from one background layer to another (figa), when the loading of the shock absorber force F section 2 of the connector main thread will collapse sooner than will be supplied 3 phase weft yarn. Therefore, the site root weft yarn 3 will be loaded when the background layers in their location will have a maximum load, providing a strong pinching the weft yarn, excluding its uncontrolled stretching (figa).

On figa) and (b) shows a longitudinal section of woven tapes of the absorber, where 1 - background layers; 2 - connecting the main thread; 3 - radical filling the thread and the site of her formed at the transition from one background layer to another. As can be seen from tiga, plot indigenous weft yarn 3 consists of one thread and PIGB - two. Thus, when the number of indigenous weft threads in this area can significantly increase the braking force when the work of the cushioning device and, consequently, increase its intensity.

If section 3 root filling thread will be of length two or more times the site 2 from the junction of the main threads that technologically it is possible, sections 3 indigenous weft threads will be loaded after filling and destroyed at least two phase 2 of the connector main thread. This chart load-elongation" operation shock absorbing device will have the appearance shown in figure 3. Such a smooth output cushioning device at the rated load, of course, is always preferable.

Figure 3 shows the view from the side (face) hand woven absorber, where a and B - background layers of woven tape, 2 - connecting suspend the main thread, 3 - torn areas of indigenous weft threads formed in the transition from one background layer to another and forming sagging and free from warp weft drawing, projecting beyond the width of the tape and forming such BA the Roma hinge edge.

Woven belt shock absorber for damping impact load works on the principle of their counterparts. When a load is applied to the ends of the tape (the background layer) stress rupture sequentially transmitted to torn areas of main and weft threads, starts consecutive rupture of the filaments and the value of the initial force (load) smoothly increases to a given level as the damping of the kinetic energy, as illustrated in figure 4 a diagram of the damping load from the extension.

Samples woven belt shock absorber for damping impact load produced on the loom brand t-2-60 equipped semisopochnoi carriage with electronic control that allows you to produce tapes with repeats on a duck to 15000. For the manufacture of shock absorbers used nylon thread 93,5 Tex ×2.

Tests of this model shock absorber was carried out according to GOST 12.4.222-99, which is an authentic European standard EN 355-92: metal a weight of 100 kg is dropped from a height of 4 m, the braking Force when the shock absorber should not exceed 6 kN, and the braking distance should not exceed 1.75 m, i.e. a safety area should not exceed 5,75 m

The prototype woven belt shock absorber when the test showed the following results:

- load when braking cargo was 4.1 kN;

- tormoznoy path when the absorber was 1.1 m

Analysis of the test results allows to conclude the following:

1. With increasing braking force to up to 6 kN estimated braking distance should be 0,8-0,9 m

2. The braking force of 6.0 kN can afford to use a safety belt with a halyard length greater than 2 m, set by the standard, or allow the use of a safety belt with a new shock absorber workers weighing more than 100 kg

1. Woven belt shock absorber for damping impact load that contains two background layer, performed by the interweaving of indigenous primary and weft threads, and connecting the main thread, earned sequentially in each of the layers with the formation between cells, characterized in that the plot of root filling thread formed at the transition from one background layer to another, has a length greater than the length of the site from the main connective threads between the two background layers, all of these areas indigenous weft yarns located in at least one lateral side of the ribbon and form passing from layer to layer sagging and free from warp weft drawing, projecting beyond the width of the tape and forming a similar looped fringe edge.

2. Woven belt shock absorber according to claim 1, characterized in that the plot of root filling thread formed at the transition from one layer to another,may consist of two indigenous weft threads, and formed their hinge edge may be located on both sides of the tape or alternate along the length of the different sides of the tape in a checkerboard pattern.



 

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