SU1199951A1 - Mining machine operator's cab - Google Patents

Abstract

The MOUNTING MACHINE CABIN, containing a frame with load-bearing elements, mounted on vibration insulators and mounted on the frame is a casing with sound and heat insulating gaskets, characterized in that, in order to increase the comfort conditions by improving its noise and vibration protective properties, the sound sound heat and heat insulating layer is laid consecutive layers of vibration-damping mastic, glue and thermal noise insulation cardboard, while the cabin ceiling has an additional layer of sound-absorbing material, and the floor is an additional a new layer of vibration-insulating elastomeric material. 2. The cabin according to claim 1, characterized in that the vibration-damping-i: i shchy mastic has a polymer base and the ratio of the thickness of the layers of the vibration dampers (L of the feeding mastic and cardboard 2.5-4. 3. the cabin according to claim 1, 6 t The fact that the vibration-damping mastic has a bitumen base and a ratio of the thickness of the mastic and cardboard layers is 3.5-4.

Description

The invention relates to underground mining machines, mainly to heading machines.

The purpose of the invention is to increase the comfort conditions by improving the noise and vibration properties of the cabin.

FIG. 1 shows a cabin, a cut-away, in FIG. 2. a section A-A in FIG. 1 in FIG. 3 is a section BB in FIG. 1 in FIG. 4 is a section, B-B in FIG. 1, in FIG. 5 is a graph of the substantiation of the optimum thickness of the mastic layer on the bitumen (1) and polymer (2) basis in FIG. 6 is a graph illustrating the optimum thickness of the paperboard of FIG. Figure 7 shows the justification for placing sound-absorbing material only on the cabin ceiling and evaluating the effectiveness of the cabin soundproofing in FIG. 8 is a graph of the basis for the placement of the vibration-isolating material on the cabin floor.

The cabin (fig 1) consists of walls 1, floor 2, ceiling 3, which are load-bearing elements and are rigidly connected along the contour of the cabin, a protective nipple 4, glazing 5, two doors (not shown) and installed on vibration isolators 6. Inside The cab is located seat 7 with autonomous system 8 vibration protection. Common to all elements of the cabin is the sequence of arrangement of the steel sheet 9, the layer of vibration-damping mastic 10 and the thermal and insulating cardboard 11 glued to the mastic. A layer of sound-absorbing material 12 (its thickness is 15–20 times the thickness of the steel sheet of the side walls) is additionally installed on the cabin ceiling (Fig. 3), and a layer of vibration-insulating elastomer material 13 is on the floor (Fig. 4).

Due to the connection of steel sheet, mastic, glue and cardboard, which blend with different acoustic impedance, the air constitutes noise and is suppressed, the optimum combination of mastic and steel layers contributes to an effective reduction of the noise component. The use of cardboard enhances the sound and heat insulation of the cabin. The location of the sound absorbing material on the ceiling of a cabin with a free area provides a residual attenuation of the energy of the reflected sound waves, preventing sound reverberation. The presence on the cabin floor of a layer of vibration-insulating elastomeric material contributes to a significant reduction in high-frequency vibration, which has the most harmful effect on the operator of a mining combine.

The choice of the optimum ratio of the thicknesses of the layers of the noise and vibration protective cab structure is made as follows.

Initially, under the strength conditions, the minimum required thickness of the steel sheet is established, which according to the results of the calculation, for example, for the walls of the mining combine cab is 2 mm. Then, on the basis of experimental and theoretical methods, the thickness of the layer of vibration-damping mastic is determined. According to the magnitude of the required reduction in structural noise (which is 4–8 dB for heading machines) and preferred parameters of the wall for vibration-damping mastic are selected from the known wall parameters. They are 2-6 mm for bitumen-based mastic and 1-5 mm for polymer-based mastic. The final assessment of the effectiveness of the coating is made from experimental data.

Cabins with application of mastic № 580 on a bitumen base with different layer thicknesses, for example 2.3, 5 and 6 mm, and mastic like Antivibrites on a polymer base with layer thicknesses, such as 1, 2.5 and 5 mm, have been tested. qualitatively similar results. With the thickness of the mastic layers on a bit-base basis of 210.5, 3.5tO, 5 and 6iO, 5 mm, the average noise reduction is correspondingly 2, 4.5 and 5 dB, respectively. If you take the ratio of the noise reduction value to the thickness of the mastic layer (or the cost of the mastic expended, since its cost is directly proportional to the thickness of the layer), you get the following values relative to the effect: 1.0, 1.28, and 0.83. Consequently, the maximum relative effect of noise reduction occurs with an average layer thickness of 3.5 mm.

In tab. 1 shows the results of checking the optimality of the layer thickness ratio. With the same thickness of the layers on bitumen and polymer mastic, the efficiency of the latter is about 1.5 times higher, and the cost is 2 times higher. According to Table. 1 graphs are plotted (Fig. 5), from which it can be seen that in the case of applying mastic on a bitumen base, the maximum relative effect is achieved with a 3.5 mm thick layer (Fig. 5, curve 1), and for mastic on a polymer base with a thickness of 2.5 mm (Fig. 5, curve 2). Similarly, the optimality of the selected thickness of thermo-soundproof cardboard is determined. When the thickness of the layer of cardboard 2, 4 and 6 mm noise reduction on average, respectively, 5.6; 12.6 and 14.5 dB. In addition, when the thickness of the cardboard layers is 8 mm, the noise reduction is 16.0 d. 2 shows the data

laziness relative noise reduction effect.

According to the table. 2 a graph is drawn (Fig. 6), from which it is seen.

It is observed that the level of vibration velocity in this case decreases in the high-frequency region of the spectrum by 3-6 dB (Fig. 8, curve II).

Table 1 514 that the maximum relative effect of noise reduction is achieved when the thickness of the cardboard layer is 4 mm. When determining the location of the sound-absorbing material, the pro- wiring of the cabins is carried out with its application to all walls and ceiling (Fig. 7, curve I) and with the application of sound-absorbing material only to the ceiling (Fig. 7, curve P). When compiling these graphs, it is clear that applying sound-absorbing material only to the ceiling is only slightly inferior to the first method in the high-frequency region of the spectrum, but provides the required reduction in the energy of the reflected sound. To reduce the level of vibration affecting the driver of the combine, a layer of elastic material is applied to the cabin iol. Research (Fig. 8) shows

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Claims (3)

MOUNTING MACHINE CABIN, containing a frame with load-bearing elements, mounted on vibration isolators and secured to the frame with sheathing, soundproofing and gasket, characterized in that, in order to improve comfort due to the improvement of its soundproofing properties, each soundproofing and gasket is made of successive layers of vibration-damper mastic, glue and thermal insulation board, while the ceiling of the cabin has an additional layer of sound-absorbing material, and the floor has an additional loi vibration insulating elastomeric material. 2. Cabin pop. 1, characterized in that the vibration damping. General mastic has a polymer base and the ratio of the thickness of the layers of vibration damping mastic and cardboard is 2.5-4. 3. Cabin according to π. 1, distinguishing me with the fact that the vibration damping mastic has a bitumen base and the ratio of the thickness of the layers of mastic and cardboard 3.5-4.