阅读说明：本技术 高承载采煤机行走系统 (High-bearing coal mining machine traveling system ) 是由 张晓永 宋相坤 史春祥 翟雨生 张斌 钱立全 王广 郭岱 胡俊 朱孝仁 朱信平 于 2019-11-15 设计创作，主要内容包括：本发明涉及一种高承载采煤机行走系统,包括导向滑靴和相互啮合的行走轮和销排,所述行走轮设有双排轮齿,双排轮齿的结构参数相同,所述销排设有双排齿槽,双排齿槽的结构参数相同,所述轮齿与齿槽按排对应啮合,所述轮齿的齿面在齿宽方向上为外凸表面,相应地,所述齿槽的槽壁在齿宽方向上为内凹表面,所述行走轮和销排在任一轮齿齿廓曲线的各个啮合位置的法向截面上均呈相互凹凸嵌合的状态。本发明承载能力大,可靠性高,能适应销排水平弯曲,且行走轮齿轮边缘不会产生应力集中,能更好地适应采煤机向大采高、大功率方向发展的需要。(The invention relates to a high-bearing coal mining machine traveling system which comprises a guide sliding shoe, and a traveling wheel and a pin row which are meshed with each other, wherein the traveling wheel is provided with double rows of gear teeth, the structural parameters of the double rows of gear teeth are the same, the pin row is provided with double rows of tooth grooves, the structural parameters of the double rows of tooth grooves are the same, the gear teeth are correspondingly meshed with the tooth grooves in rows, the tooth surfaces of the gear teeth are convex surfaces in the tooth width direction, correspondingly, the groove walls of the tooth grooves are concave surfaces in the tooth width direction, and the traveling wheel and the pin row are in a mutual concave-convex embedded state on the normal cross section of each meshing position of any gear tooth profile. The invention has large bearing capacity and high reliability, can adapt to horizontal bending of pin rows, does not generate stress concentration at the edge of the gear of the traveling wheel, and can better adapt to the development requirement of the coal mining machine towards large mining height and high power.)

1. The utility model provides a high coal-winning machine traveling system that bears, includes intermeshing's walking wheel and round pin row, its characterized in that: the walking wheel is equipped with double teeth of a cogwheel, and the structural parameter of double teeth of a cogwheel is the same, the phase place is unanimous, the round pin is arranged and is equipped with double tooth's socket, and the structural parameter of double tooth's socket is the same, the phase place is unanimous, the teeth of a cogwheel corresponds the meshing with the tooth's socket according to arranging, the flank of a cogwheel is convex surface on the tooth width direction, correspondingly, the cell wall of tooth's socket is concave surface on the tooth width direction, walking wheel and round pin are arranged and all are the state of mutual unsmooth gomphosis on the.

2. The high-capacity shearer loader traveling system according to claim 1, wherein: the walking wheels adopt straight gears, and the single-row gear teeth and the tooth grooves which are meshed with each other are symmetrical in the respective tooth width direction.

3. The high-capacity shearer loader traveling system according to claim 2, wherein: the tooth surface of the gear tooth is in an outward convex shape on the normal section of each meshing position, the outline is an outward convex curve, or the middle section of the outline is a straight line, and the two side sections are circular arcs.

4. The high-capacity shearer loader traveling system according to claim 3, wherein: when the contour is an outward convex curve, the curve is a section of curve on an arc or an ellipse.

5. The high-capacity shearer loader traveling system according to claim 4, wherein: the curve is an arc, the radii of arcs corresponding to the profiles of the tooth surfaces of the gear teeth on the normal cross sections of the meshing positions are equal and are recorded as R1, the profiles of the groove walls of the tooth grooves on the normal cross sections of the meshing positions are all concave arcs, the radii of the arcs are equal and are recorded as R2, and R1 is less than R2.

6. The high-capacity shearer loader traveling system according to claim 5, wherein: the ratio of R1 to R2 is between 0.85 and 0.98.

7. The high haulage shearer loader traveling system according to claim 1, 2, 3, 4, 5, or 6, wherein: a pair of tooth sockets with the same phase are communicated, and a step is formed between the groove walls on the same side of the corresponding pair of tooth sockets at the communication position.

8. The high-capacity shearer loader traveling system according to claim 7, wherein: the pin row is provided with a plurality of sections which are sequentially arranged along the length direction of the working face to form a track of the walking wheels.

9. The high-capacity shearer loader traveling system according to claim 7, wherein: 4-8 tooth grooves are arranged on the single-section pin row in a single row.

10. The high-capacity shearer loader traveling system according to claim 7, wherein: the walking wheels are large-module walking wheels.

Technical Field

The invention relates to a traveling system of a coal mining machine, which has higher bearing capacity and belongs to the technical field of coal mining equipment.

Background

The driving force for the coal mining machine to walk on the coal face in the underground coal mine is usually finally the meshing transmission of pin teeth of pin row series from the walking wheel of the coal mining machine and the scraper conveyor. The scraper pin row series consists of a plurality of pin rows with the same structure. The walking wheels and the scraper pin rows are in open non-conjugate engagement to drive the coal mining machine to walk back and forth in a traction manner. In the walking process of the working face, the pin row is allowed to deflect by 1 degree in the horizontal plane, and the pin row is used for meeting the requirements of the working face when the working face is pushed, rolled and straightened and a coal cutter walks an S-shaped cutting machine nest.

At present, the coal mining machine is developed towards the direction of large mining height and high power, the installed power of the coal mining machine reaches about 3000kW at most at home and abroad, the fully-mechanized mining height reaches more than 8m, and the total weight of the coal mining machine reaches more than 200 t. When the coal mining machine cuts coal, the working resistance is large, the working surface has an inclination angle, and the traction force of the coal mining machine needs to be increased, so that the traveling system of the coal mining machine faces the following two key problems:

1. how to improve the bearing capacity of heavy large module gear (module m is more than 46) and pin row and avoid the stress concentration of gear edge to increase the traction force output by a coal cutter terminal walking system and improve the reliability? of the walking system

2. Under the condition of large traction force of the coal mining machine, the contact stress of the road wheel and the pin row is increased sharply, and under the condition that the pin row is bent horizontally, how to improve the meshing stress condition of the road wheel gear teeth and the pin row and improve the reliability? of a traveling system

Chinese patent application No. 200910044922.1 discloses a double-row driving chainless traction system for coal mining machine, which utilizes a plurality of pin rails arranged side by side and special traveling wheels (multi-row traveling wheels) engaged with the plurality of pin rails, wherein the gear teeth of each row of traveling wheels are engaged with the corresponding pin rails and the gear teeth of the other row of traveling wheels are engaged with the corresponding pin rails by a phase angle, the output force of each gear tooth is the same, the total traction force is greatly improved, and if the total traction force is not changed, the output force of each gear tooth is small, thereby improving the reliability of the equipment. The application does not solve the problem of how the walking wheel adapts to the horizontal deflection angle of the pin rail, does not solve the problem of tooth shape, and only increases the number of pairs of the teeth of the walking wheel meshed with the pin rail; in addition, because the tooth form of one row of pin rails is over against the tooth grooves of the other row, the pin rows are difficult to produce and manufacture in a segmented mode.

Disclosure of Invention

In order to solve the problems, the invention provides a high-bearing coal mining machine traveling system which is high in bearing capacity and reliability, can adapt to horizontal bending of pin rows, does not generate stress concentration at the edge of a traveling wheel gear, and can better adapt to the development requirement of a coal mining machine in the direction of large mining height and large power.

The main technical scheme of the invention is as follows:

the utility model provides a high bearing coal-winning machine traveling system, includes that intermeshing's walking wheel and round pin are arranged, the walking wheel is equipped with double teeth of a cogwheel, and the structural parameter of double teeth of a cogwheel is the same, the phase place is unanimous, the round pin is arranged and is equipped with double tooth's socket, and the structural parameter of double tooth's socket is the same, the phase place is unanimous, the teeth of a cogwheel corresponds the meshing with the tooth's socket according to arranging, the flank of a cogwheel is convex surface on the tooth width direction, correspondingly, the cell wall of tooth's socket is concave surface on the tooth width direction, walking wheel and round pin row all are the state of mutual.

The walking wheels adopt straight gears, and the single-row gear teeth and the tooth grooves which are meshed with each other are symmetrical in the respective tooth width direction.

The profile of the tooth surface of the gear tooth on the normal section of each meshing position is in an outward convex shape, the profile can be an outward convex curve, or the middle section of the profile is a straight line, and the two side sections are circular arcs.

When the contour is a convex curve, the curve may be a segment of a circle or an ellipse.

Preferably, the curved line is an arc, the radii of the arcs corresponding to the profiles of the tooth surfaces of the gear teeth on the normal cross sections of the meshing positions are all equal and are recorded as R1, the profiles of the groove walls of the tooth grooves on the normal cross sections of the meshing positions are all concave arcs, the radii of the arcs are all equal and are recorded as R2, and R1 is less than R2.

The ratio of R1 to R2 is preferably between 0.85 and 0.98.

A pair of tooth sockets with the same phase are communicated, and a step is formed between the groove walls on the same side of the corresponding pair of tooth sockets at the communication position.

The invention has the beneficial effects that:

by adopting the novel meshing structure of the travelling wheels and the pin row, the bearing capacity of the travelling system can be improved without changing the modulus of the travelling wheels, the edge effect of the wheel teeth is avoided, the phenomenon that the traction force output of the coal mining machine can be continuously increased due to the tooth breakage or premature fatigue failure caused by the sharp increase of the unbalance-loading edge stress of the wheel teeth is avoided, or the bearing capacity of the pin row is improved under the condition of increasing the modulus of the travelling wheels, so that the requirements of heavy load and large traction force of the coal mining machine can be met, and the reliability of the travelling system can be improved. Especially, the effect is more obvious under the condition of heavy-load traction of the coal mining machine.

The invention can well adapt to the horizontal bending of the walking track, when the working surface is pushed to slide unevenly or the working surface is fluctuated, or the mining machine walks in an S-bend manner, the walking wheels and the pin rows have the tendency of automatically guiding to slow down the unbalance loading engagement of the pin rows and the walking wheels, thereby spontaneously improving the engagement state and prolonging the service life of a walking system.

Drawings

Fig. 1 is a schematic structural view of a state that a road wheel and a pin row are meshed according to one embodiment of the invention;

FIG. 2 is a cross-sectional view C-C of FIG. 1;

FIG. 3 is a schematic structural view of a gear tooth of one embodiment of the road wheel;

FIG. 4 is a schematic view of a tooth slot profile of one embodiment of the pin row;

FIG. 5 is a schematic cross-sectional view of a slot wall of one tooth slot of the pin row;

fig. 6 is a schematic view of analysis of engagement stress of the traveling wheels and the pin rows when the two adjacent pin rows have an intersection angle.

Detailed Description

The invention discloses a high-bearing coal mining machine walking system (a walking system for short), which comprises a walking wheel 1 and a pin row 2 which are meshed with each other, wherein the pin row is fixed on a scraper machine along the length direction of a working surface, and the walking wheel is meshed in two directions along the pin row to drive a coal mining machine to walk back and forth along the working surface, as shown in figures 1-6. The traveling wheels are provided with double rows of gear teeth 11 and 12, the double rows of gear teeth are machined on the same gear blank, the structural parameters of the double rows of gear teeth, such as the number of teeth, the modulus, the diameter of a tooth top circle, the shape of a tooth profile line and the like, are the same, and the phases are consistent. The two side tooth surfaces of each gear tooth are convex and symmetrical in the tooth thickness direction. The pin row is provided with double rows of tooth grooves, and the structural parameters of the double rows of tooth grooves are the same and the phases are consistent. The gear teeth are correspondingly meshed with the tooth grooves in rows. The two side walls of each tooth space (and also the tooth flanks of the teeth of the pin row) are concave (e.g., may be concave arcs) and symmetrical in the tooth thickness direction of the tooth teeth that mesh with it.

Through the meshing of double-wheel teeth, when the walking wheel is meshed with the pin row to walk, the walking wheel can bear larger traction force of the coal mining machine. If meet abnormal conditions, for example after a certain gear teeth breaks off, another parallel gear teeth participate in the meshing, can meet an urgent need and drive the coal-winning machine to produce along the working face, do not influence output, wait to change again when the maintenance shift and fall unusual walking wheel, consequently improved traveling system's reliability greatly.

The center distance of the double row of gear teeth 11 and 12 in the tooth width direction is D1, and is equal to the center distance D2 of the tooth spaces in pairs juxtaposed on the pin row in the tooth width direction.

The tooth surface of the gear tooth is an outer convex surface in the tooth width direction, namely the closer to two ends of the tooth width direction, the thinner the tooth thickness is, and the closer to the middle of the tooth width direction, the thicker the tooth thickness is. Accordingly, the groove wall of the tooth groove is an inner concave surface in the tooth width direction, that is, the tooth thickness of the teeth on the pin row is thicker as the teeth are closer to both ends in the tooth width direction, and the tooth thickness is thinner as the teeth are closer to the middle in the tooth width direction. The walking wheel and the pin row are in a mutual concave-convex embedded state on the normal section of each meshing position of any gear tooth profile curve.

The gear is a straight gear. The single row of engaged teeth and tooth spaces are preferably symmetrical in the respective tooth width directions, and in an ideal engagement state, the theoretical contact point of the tooth and tooth space is located on the symmetrical center plane of the corresponding tooth space in the tooth width direction.

The normal cross-section extends along a normal to the tooth flanks of the engagement position. Each engagement location corresponds to a normal cross-section. Taking the walking wheel as an example, each point on the tooth profile curve of the gear tooth corresponds to a meshing position, namely a normal section, the common normal line passing through the meshing position is positioned in the corresponding normal section, and the normal section is parallel to the axis of the walking wheel.

Further, the tooth surface of the gear tooth has an outward convex profile on the normal section of each meshing position, and the profile can be in a convex curve shape or a composite shape with a straight middle section and circular arc sections at two sides.

When the contour is a convex curve, the curve may be a circular arc or a segment of a curve on an ellipse.

In the embodiment shown in the drawings, the curves preferably adopt circular arcs, and the radii of the circular arcs corresponding to the profiles of the tooth surfaces of the gear teeth on the normal cross sections of the various meshing positions are all equal and are denoted as R1, where the equal radii of the circular arcs mean that the radii of the circular arcs of two tooth surface contour lines of the same gear tooth on the same normal cross section are equal, and the radii of the circular arcs of the tooth surface contour lines on the normal cross sections of different meshing positions of the same gear tooth are also equal. Correspondingly, the contour of the groove wall of the tooth groove on the normal section of each meshing position is an inward concave circular arc, and the radiuses of the circular arcs are equal and are recorded as R2. The same meaning of the radii of the arcs on the tooth grooves is the same as that of the teeth.

Preferably, R1< R2 can eliminate or obviously reduce the edge effect of the gear teeth under heavy load when the travelling wheels are meshed with the pin row, and is beneficial to avoiding or reducing the gear teeth from being cracked or prematurely fatigue failure due to the sharp increase of the eccentric load edge stress of the gear teeth. Moreover, in the meshing process, due to the elastic deformation of the gear teeth, the tooth surface of the gear teeth of the walking wheel gear and the tooth surface of the pin row teeth can form curve line contact, so that the contact stress is obviously reduced, the bearing capacity is improved, and the wear resistance and the service life are obviously improved.

As a further preferable technical scheme, the ratio of R1 to R2 is controlled to be 0.85-0.98, so that on one hand, the edge effect of a traveling wheel of a coal mining machine under a heavy load condition is avoided, the phenomenon that the edge of the traveling wheel tooth in the tooth width direction is subjected to stress concentration to crack is prevented, and on the other hand, the tooth can keep high strength.

As shown in fig. 4 and 5, a pair of tooth grooves of the same phase are communicated with each other, and a step 22 is formed between the groove walls 21 and 23 of the corresponding pair of tooth grooves. The so-called step is relative to the inner concave surface of the groove walls 21 and 23, so that the communication is significantly narrowed compared to the tooth grooves. The surface shape of the step 22 is not particularly limited, but the side line of the step 22 in the normal section of each engagement position is preferably linear, and the structure is simple and easy to process.

As shown in fig. 5, when the output force of the road wheel is increased, if the section of the tooth profile of the pin row along the tooth width direction is a large arc, the sectional area of the tooth profile is greatly reduced compared with the structure shown in fig. 4, such as the area of the shaded part in fig. 5, so that the strength of the tooth profile of the pin row is greatly weakened, the reliability of the pin row is reduced, and the pin row is broken in severe cases. The invention adopts the structure that the double rows of tooth grooves are communicated with each other by the narrowed notches between the paired tooth grooves as shown in figure 4, thereby preventing the middle part of the pin row in the tooth width direction from being broken and improving the bearing capacity of the tooth shape of the pin row.

The pin row is provided with a plurality of sections which are sequentially arranged along the length direction of the working face to form a track of the walking wheels. 4-8 tooth grooves are arranged on the single-section pin row in a single row. When the walking wheels and the pin rows are meshed to walk, because the mining machine pit runs in an S-shaped curve, or although the coal mining machine walks in a straight line section but because a working surface is pushed to be uneven or the working surface is fluctuated, an included angle alpha (shown in figure 6) is often formed between two adjacent pin rows, although the theoretical contact point of the tooth teeth of the walking wheels and the tooth grooves of the pin rows deviates from the symmetrical central plane of the tooth grooves in the tooth width direction, the walking wheels and the pin rows can still keep circular arc curves to be meshed, and the situation that the tooth surfaces of the traditional cylindrical gear are finally cracked due to the fact that stress is increased because of the meshing of edge contact points can not occur. Meanwhile, the meshing force F between the travelling wheels and the pin rows can be decomposed into component forces Fn and Ft which are perpendicular to each other, as shown in FIG. 6, the meshing component force Fn has a tendency of pushing the travelling wheels of the coal mining machine to enable the contact points of the gear teeth and the tooth spaces to move towards the symmetrical central plane of the tooth spaces in the tooth width direction, so that the meshing state can be spontaneously improved, and the reliability of a travelling system is improved. Therefore, the walking system can be well adapted to the horizontal bending of the walking wheel track, has the function of automatic guiding, improves the meshing state and prolongs the service life of the walking system.

The walking wheels can adopt large-module walking wheels, and due to the adoption of the meshing structure, the corresponding walking system of the coal mining machine can meet the requirement of large traction force in large mining height and high-power occasions, and simultaneously can keep higher reliability and adaptability to horizontal bending of walking tracks.