Small-curvature walking wheel and walking system
By designing the small curvature walking wheel and adjusting the pin-row assembly, the problem of the increase in the contact stress between the walking wheel and the pin-row when the working surface of the coal miner is undulating, the low contact stress at the extreme deflection angle is achieved, and the equipment is extended Lifespan and wear reduction.
Patent Information
- Application Number
- CN202411235507.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-04
- Publication Date
- 2024-12-31
AI Technical Summary
When the working surface of the coal miner is undulating or not straight, the contact between the walking wheel and the pin row changes from line contact to point contact, resulting in increased stress, which may cause plastic deformation of the tooth surface and reduce service life, and due to the pin row The mounting holes are worn and the deflection angle exceeds the allowable range, resulting in further damage.
A small curvature walking wheel is designed, and the meshing line of the gear teeth meshing surface is a curve, including connecting lines, contact lines and transition lines. The radius of curvature of the contact line is much larger than that of conventional tooth shapes, which reduces contact stress and adjusts the pin row. The assembly's engagement holes and deflection angle ensure the walking system's contact stress is minimized at the ultimate deflection angle.
The small curvature walking wheel can adapt to the undulation of the working surface and the ultimate deflection angle, reduce the contact stress of the walking system, extend the service life, reduce tooth surface damage, and improve the wear resistance and adaptability of the equipment.
Smart Images
Figure CN119221924A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of coal mining equipment, and in particular to a small-curvature traveling wheel and a traveling system. Background Art
[0002] When the coal mining machine is working normally, the pin row does not deflect, the traveling wheel moves forward in a straight line, the traveling wheel teeth are in straight line contact with the pin row, and the traveling wheel and the pin row are evenly stressed.
[0003] When the working surface is undulating or the push slide is not straight, the two pin rows will have a certain deflection angle, and the meshing between the shearer's travel wheel and the pin row will change from line contact to point contact, the force will increase and the load will be offset. When the working surface pushes too fast and causes the angle between the two pin rows to increase to the maximum allowable angle, the contact force between the travel wheel and the pin row is the largest. If the allowable stress of the material is exceeded, the plastic deformation and damage of the travel wheel and the pin row tooth surface will occur, greatly reducing the service life of the travel system.
[0004] After the pin row has been used for a period of time, due to the wear of the pin row mounting holes, the deflection angle between the two sections of the pin row will be greater than the factory allowable angle. If it is not replaced in time, the damage to the tooth surface of the walking system will be aggravated. Summary of the invention
[0005] The technical problem to be solved by the present invention is to design a small curvature walking wheel and a walking system which can adapt to the undulation of the working surface and the oblique cutting coal cutting working conditions of the coal mining machine.
[0006] In order to solve the above technical problems, the small curvature walking wheel of the present invention includes a wheel body and gear teeth evenly arranged along the circumferential direction on the outer edge of the wheel body, and is characterized in that the meshing lines of the meshing surfaces on both sides of the gear teeth are curves; wherein the meshing lines include: a connecting line; a contact line, wherein the number of the contact lines is two, and one end of the two contact lines is respectively connected to the two ends of the connecting line; a transition line, wherein the number of the transition lines is two, and one end of the two transition lines is respectively connected to the other end of the two contact lines.
[0007] Furthermore, the connecting line is a straight line.
[0008] Furthermore, the contact line is tangent to the connection line at a connection point between the contact line and the connection line.
[0009] The contact line is a curved line.
[0010] Furthermore, the radius of curvature of the other end of the contact line is R, and R>R2; wherein R2 satisfies: In the formula, σ H : contact stress at the meshing point between the small curvature running wheel and the pin row; Z E: Elastic coefficient; F: contact force; R2: contact radius of small curvature running wheel; R1: pin row contact radius; b: effective contact width of running wheel.
[0011] Furthermore, the transition line is an arc or a curve with a continuously changing radius of curvature.
[0012] The walking system includes a pin row assembly and a small curvature walking wheel, and the small curvature walking wheel is a small curvature walking wheel.
[0013] Furthermore, the pin row assembly includes two sections of pin rows, and the two sections of the pin rows are respectively provided with engaging holes, and the engaging holes match the gear teeth.
[0014] Furthermore, the two sections of the pin rows and the small curvature walking wheels satisfy: α-(X / 2)°≤β≤α, wherein, γ: the angle between the curvature direction of the other end of the contact line and the connecting line, α: the maximum allowable deflection angle of the two pin rows leaving the factory, β: the limit deflection angle between the two pin rows, and X: the maximum deflection angle of the middle groove level of the scraper.
[0015] γ≤β.
[0016] The main beneficial effects of the present invention are as follows: the small curvature running wheel is composed of multiple tooth profiles along the tooth width direction, wherein the end tooth profile uses a small curvature tooth profile to increase the curvature radius. Although the small curvature tooth profile is still in point contact with the pin row, the contact stress is reduced because the curvature radius is much larger than the conventional tooth profile, so it can ensure that the small curvature running wheel adapts to the extreme deflection angle of the pin row and reduce the contact stress at the meshing point of the small curvature running wheel and the pin row under the extreme deflection angle. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Other features, objects and advantages of the present invention will become more apparent from a reading of the detailed description of non-limiting embodiments made with reference to the following accompanying drawings.
[0018] Figure 1 This is a schematic diagram of the structure of a walking system in one embodiment of the present invention;
[0019] Figure 2 for Figure 1 A cross-sectional view of the KK plane;
[0020] Figure 3 It is a top view of the pin row without deflection and a partial enlarged view of the tooth meshing position in one embodiment of the present invention;
[0021] Figure 3 a is a top view of the pin arrangement without deflection of the present invention, Figure 3 b is Figure 3 A partial enlarged view of the tooth meshing position in a;
[0022] Figure 4A top view of the maximum allowable deflection angle α of the pin out of the factory and a partial enlarged view of the tooth meshing position in one embodiment of the present invention;
[0023] Figure 4 a is a top view of the maximum allowable deflection angle α of the pin discharge from the factory of the present invention, Figure 4 b is Figure 4 A partial enlarged view of the tooth meshing position in a;
[0024] Figure 5 It is a top view of the limit deflection angle β of the pin row mounting hole after wear and a partial enlarged view of the tooth meshing position in one embodiment of the present invention.
[0025] Figure 5 a is a top view of the pin row mounting hole of the present invention after wear and tear with a limit deflection angle β, Figure 5 b is Figure 5 A partial enlarged view of the tooth meshing position in a.
[0026] Description of the reference numerals in the drawings of the small curvature running wheel and the running system of the present invention:
[0027] 1- small curvature walking wheel,
[0028] 11-Connection wire,
[0029] 12-Contact wire,
[0030] 13- Transition line,
[0031] 21-1st pin row,
[0032] 22- Second pin row,
[0033] 100-wheel body,
[0034] 101-Gear teeth. DETAILED DESCRIPTION
[0035] The intelligent air conditioning control system of the present invention is further described in detail below in conjunction with the accompanying drawings. In the following detailed description, only certain exemplary embodiments of the present invention are described by way of illustration. Needless to say, those skilled in the art will recognize that the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the drawings and descriptions are illustrative in nature and are not intended to limit the scope of protection of the claims.
[0036] refer to Figure 1 Combined with Figure 2 to Figure 5 In some embodiments of the present invention, the small curvature running wheel 1 comprises a wheel body 100 and gear teeth 101 uniformly arranged along the circumferential direction on the outer edge of the wheel body, and the meshing lines of the meshing surfaces on both sides of the gear teeth are curves;
[0037] The meshing line includes a connecting line 11, a contact line 12 and a transition line 13; the connecting line 11 is in the middle section of the meshing line; the contact line 12, there are two contact lines 12, which are respectively arranged at the two ends of the connecting line 11, and one end of the two contact lines 12 is respectively connected to the two ends of the connecting line 11; there are two transition lines 13, which are respectively arranged at the other end of the contact line 12 away from the connecting line 11, and one end of the two transition lines 13 is respectively connected to the other end of the two contact lines 12.
[0038] As a preference, the connecting line 11 is a straight line.
[0039] As a preference, the contact line 12 is tangent to the connecting line 11 at a connecting point between the contact line 12 and the connecting line 11 .
[0040] As a preference, the contact line 13 may be a curve.
[0041] As a preferred embodiment, the radius of curvature of the other end of the contact line 12 is R, and R>R2; wherein R2 satisfies: In the formula, σ H : contact stress at the meshing point between the small curvature running wheel and the pin row; Z E : elastic coefficient; F: contact force; R2: contact radius of small curvature walking wheel, R1: pin row contact radius, b: effective contact width of walking wheel.
[0042] As a preference, the transition line is an arc or a curve with a continuously changing radius of curvature.
[0043] The traveling system in a certain embodiment of the invention includes a pin row assembly and a small curvature traveling wheel, and the small curvature traveling wheel is the small curvature traveling wheel 1 described above.
[0044] As a preference, the pin row assembly comprises two sections of pin rows, and the two sections of the pin rows are respectively provided with engaging holes, and the engaging holes match the gear teeth 101.
[0045] As a preference, the two sections of the pin rows and the small curvature walking wheels satisfy: α-(X / 2)°≤β≤α; wherein, γ: the angle between the curvature direction of the other end of the contact line and the connecting line, α: the maximum allowable deflection angle of the two pin rows leaving the factory, β: the limit deflection angle between the two pin rows, and X: the maximum deflection angle of the middle groove level of the scraper.
[0046] As a preference, γ≤β.
[0047] It can be understood that the travel system of the present invention is mainly composed of a small curvature travel wheel 1 and a first pin row 21 and a second pin row 22. The gear teeth of the small curvature travel wheel are in the meshing side direction with the pin row, and the tooth shape is composed of multiple lines along the tooth width direction, namely: a connecting line 11, located in the middle position, when the two pin rows are in the Figure 3In the position shown, the connection line 11 is most widely engaged with the pin row, which is the main load-bearing position under normal conditions. The contact lines 12 are located on both sides of the connection line 11, and there are two of them. The starting point is tangent to the connection line 11, the curvature radius of the end point is R, and the angle between the curvature direction at the end point and the connection line 11 is γ. Moreover, the curvature radius is R, where R2 satisfies: In the formula, σ H : contact stress at the meshing point between the small curvature running wheel and the pin row; Z E : elastic coefficient; F: contact force; R2: contact radius of small curvature walking wheel, R1: pin row contact radius, b: effective contact width of walking wheel.
[0048] Since the curvature radius R is larger than the contact radius R2 of the small curvature running wheel, the contact stress will be greatly reduced according to the above contact stress formula.
[0049] At the same time, when the first pin row 21 and the second pin row 22 are in the Figure 4 When the factory limit position is shown, the maximum allowable deflection angle of the pin row is α. When the wear of the pin row mounting hole is considered, the limit deflection angle of the pin row can be β. The relationship between the three satisfies: α-(X / 2)°≤β≤α, where γ: the angle between the curvature direction of the other end of the contact line and the connecting line, and X: the maximum deflection angle of the horizontal groove in the middle of the scraper. Among them, α=90°-(X / 2)°. Although β≤α, β should not be too small, and the smaller β means the greater the wear of the equipment, which is harmful to the use of the working surface equipment. Based on the limitation of the use of three machines on the entire working surface, β should be greater than α-(X / 2)°, and the closer to α, the lower the wear, and the better the adaptability of the three machines. In addition, γ should be less than or equal to β, otherwise there will be interference problems between the walking wheel and the pin row in structure. However, the larger R is, the smaller the contact stress is, so R should be increased as much as possible. The radius of curvature at the end point of the contact line 12 is R, the center is o, the horizontal distance between the end point and the center of curvature is L, and the angle between the line connecting the end point and the center and the horizontal line is θ, then: sin(θ)=L / R; γ=90-θ; therefore It can be seen that, under the premise of a certain L, the larger γ is, the larger R is, and the lower the contact stress is. In particular, when γ=β, R is the largest and the contact stress is the lowest. Therefore, γ should be as close to β as possible.
[0050] In addition, transition line 13 is located at the outermost side in the tooth width direction, and there are two of them. They are transition arcs between contact line 12 and end face. Transition line 13 can be a circular arc or a curve with continuously changing curvature radius. When it is a circular arc, the contact stress at transition line 13 is constant; when it is a curve, its curvature radius should change continuously to ensure continuous stress change. Regardless of whether transition line 13 is a circular arc or a curve with continuously changing curvature, the curvature radius should be as large as possible to reduce the contact stress at the meshing point with the pin row to prevent tooth shape damage, while ensuring that it can adapt to the deflection angle of the pin row.
[0051] The preferred embodiments of the present invention have been specifically described above, but the present invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention, and these equivalent modifications or substitutions are all included in the scope of this application.
Claims
1. A small curvature running wheel (1), comprising a wheel body (100) and gear teeth (101) uniformly arranged along the circumferential direction on the outer edge of the wheel body, characterized in that: The meshing lines of the meshing surfaces on both sides of the gear teeth are curves, and the meshing lines include a connecting line (11), a contact line (12) and a transition line (13); wherein, A connecting line (11), the connecting line (11) is in the middle section of the meshing line; Contact wires (12), the number of the contact wires (12) being two, which are respectively arranged at the two ends of the connecting wire (11), and one end of the two contact wires (12) is respectively connected to the two ends of the connecting wire; The transition lines (13) are two in number and are respectively arranged at the other end of the contact line (12) away from the connection line (11).
2. The small curvature running wheel (1) according to claim 1, characterized in that: The connecting line (11) is a straight line.
3. The small curvature running wheel (1) according to claim 1, characterized in that: The contact line (12) is tangent to the connecting line (11) at a connecting point between the contact line (12) and the connecting line (11).
4. The small curvature running wheel (1) according to any one of claims 1 or 3, characterized in that: The contact line (13) is a curve.
5. The small curvature running wheel (1) according to claim 4, characterized in that: The curvature radius of the contact line is R, and R>R2, Among them, R2 satisfies: In the formula, σ H : contact stress at the meshing point between the small curvature running wheel and the pin row; Z E : elastic coefficient; F: contact force; R2: contact radius of small curvature walking wheel, R1: pin row contact radius, b: effective contact width of walking wheel.
6. The small curvature running wheel according to claim 4, characterized in that: The transition line is an arc or a curve with a continuously changing curvature radius.
7. The walking system includes a pin row assembly and a small curvature walking wheel, characterized in that: The small curvature running wheel is a small curvature running wheel as described in any one of claims 1 to 6.
8. The walking system according to claim 7, characterized in that: The pin row assembly includes two sections of pin rows, and engagement holes are respectively provided on the two sections of the pin rows, and the engagement holes match the gear teeth as described in any one of claims 1-6.
9. The walking system according to claim 8, characterized in that: The two sections of the pin rows and the small curvature walking wheels satisfy: α-(X / 2)°≤β≤α; where, γ: the angle between the curvature direction of the other end of the contact line and the connecting line; α: the maximum allowable deflection angle of the two pin rows leaving the factory; β: the limit deflection angle between the two pin rows; X: the maximum deflection angle of the middle groove level of the scraper.
10. The walking system according to claim 9, characterized in that: γ≤β.